1 /* Tracepoint code for remote server for GDB.
2 Copyright (C) 2009-2015 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "tracepoint.h"
21 #include "gdbthread.h"
28 #include "gdb_sys_time.h"
33 #define DEFAULT_TRACE_BUFFER_SIZE 5242880 /* 5*1024*1024 */
35 /* This file is built for both GDBserver, and the in-process
36 agent (IPA), a shared library that includes a tracing agent that is
37 loaded by the inferior to support fast tracepoints. Fast
38 tracepoints (or more accurately, jump based tracepoints) are
39 implemented by patching the tracepoint location with a jump into a
40 small trampoline function whose job is to save the register state,
41 call the in-process tracing agent, and then execute the original
42 instruction that was under the tracepoint jump (possibly adjusted,
43 if PC-relative, or some such).
45 The current synchronization design is pull based. That means,
46 GDBserver does most of the work, by peeking/poking at the inferior
47 agent's memory directly for downloading tracepoint and associated
48 objects, and for uploading trace frames. Whenever the IPA needs
49 something from GDBserver (trace buffer is full, tracing stopped for
50 some reason, etc.) the IPA calls a corresponding hook function
51 where GDBserver has placed a breakpoint.
53 Each of the agents has its own trace buffer. When browsing the
54 trace frames built from slow and fast tracepoints from GDB (tfind
55 mode), there's no guarantee the user is seeing the trace frames in
56 strict chronological creation order, although, GDBserver tries to
57 keep the order relatively reasonable, by syncing the trace buffers
62 #ifdef IN_PROCESS_AGENT
64 static void trace_vdebug (const char *, ...) ATTRIBUTE_PRINTF (1, 2);
67 trace_vdebug (const char *fmt, ...)
73 vsprintf (buf, fmt, ap);
74 fprintf (stderr, PROG "/tracepoint: %s\n", buf);
78 #define trace_debug_1(level, fmt, args...) \
80 if (level <= debug_threads) \
81 trace_vdebug ((fmt), ##args); \
86 #define trace_debug_1(level, fmt, args...) \
88 if (level <= debug_threads) \
90 debug_printf ((fmt), ##args); \
91 debug_printf ("\n"); \
97 #define trace_debug(FMT, args...) \
98 trace_debug_1 (1, FMT, ##args)
100 /* Prefix exported symbols, for good citizenship. All the symbols
101 that need exporting are defined in this module. Note that all
102 these symbols must be tagged with IP_AGENT_EXPORT_*. */
103 #ifdef IN_PROCESS_AGENT
104 # define gdb_tp_heap_buffer IPA_SYM_EXPORTED_NAME (gdb_tp_heap_buffer)
105 # define gdb_jump_pad_buffer IPA_SYM_EXPORTED_NAME (gdb_jump_pad_buffer)
106 # define gdb_jump_pad_buffer_end IPA_SYM_EXPORTED_NAME (gdb_jump_pad_buffer_end)
107 # define gdb_trampoline_buffer IPA_SYM_EXPORTED_NAME (gdb_trampoline_buffer)
108 # define gdb_trampoline_buffer_end IPA_SYM_EXPORTED_NAME (gdb_trampoline_buffer_end)
109 # define gdb_trampoline_buffer_error IPA_SYM_EXPORTED_NAME (gdb_trampoline_buffer_error)
110 # define collecting IPA_SYM_EXPORTED_NAME (collecting)
111 # define gdb_collect IPA_SYM_EXPORTED_NAME (gdb_collect)
112 # define stop_tracing IPA_SYM_EXPORTED_NAME (stop_tracing)
113 # define flush_trace_buffer IPA_SYM_EXPORTED_NAME (flush_trace_buffer)
114 # define about_to_request_buffer_space IPA_SYM_EXPORTED_NAME (about_to_request_buffer_space)
115 # define trace_buffer_is_full IPA_SYM_EXPORTED_NAME (trace_buffer_is_full)
116 # define stopping_tracepoint IPA_SYM_EXPORTED_NAME (stopping_tracepoint)
117 # define expr_eval_result IPA_SYM_EXPORTED_NAME (expr_eval_result)
118 # define error_tracepoint IPA_SYM_EXPORTED_NAME (error_tracepoint)
119 # define tracepoints IPA_SYM_EXPORTED_NAME (tracepoints)
120 # define tracing IPA_SYM_EXPORTED_NAME (tracing)
121 # define trace_buffer_ctrl IPA_SYM_EXPORTED_NAME (trace_buffer_ctrl)
122 # define trace_buffer_ctrl_curr IPA_SYM_EXPORTED_NAME (trace_buffer_ctrl_curr)
123 # define trace_buffer_lo IPA_SYM_EXPORTED_NAME (trace_buffer_lo)
124 # define trace_buffer_hi IPA_SYM_EXPORTED_NAME (trace_buffer_hi)
125 # define traceframe_read_count IPA_SYM_EXPORTED_NAME (traceframe_read_count)
126 # define traceframe_write_count IPA_SYM_EXPORTED_NAME (traceframe_write_count)
127 # define traceframes_created IPA_SYM_EXPORTED_NAME (traceframes_created)
128 # define trace_state_variables IPA_SYM_EXPORTED_NAME (trace_state_variables)
129 # define get_raw_reg IPA_SYM_EXPORTED_NAME (get_raw_reg)
130 # define get_trace_state_variable_value \
131 IPA_SYM_EXPORTED_NAME (get_trace_state_variable_value)
132 # define set_trace_state_variable_value \
133 IPA_SYM_EXPORTED_NAME (set_trace_state_variable_value)
134 # define ust_loaded IPA_SYM_EXPORTED_NAME (ust_loaded)
135 # define helper_thread_id IPA_SYM_EXPORTED_NAME (helper_thread_id)
136 # define cmd_buf IPA_SYM_EXPORTED_NAME (cmd_buf)
139 #ifndef IN_PROCESS_AGENT
141 /* Addresses of in-process agent's symbols GDBserver cares about. */
143 struct ipa_sym_addresses
145 CORE_ADDR addr_gdb_tp_heap_buffer;
146 CORE_ADDR addr_gdb_jump_pad_buffer;
147 CORE_ADDR addr_gdb_jump_pad_buffer_end;
148 CORE_ADDR addr_gdb_trampoline_buffer;
149 CORE_ADDR addr_gdb_trampoline_buffer_end;
150 CORE_ADDR addr_gdb_trampoline_buffer_error;
151 CORE_ADDR addr_collecting;
152 CORE_ADDR addr_gdb_collect;
153 CORE_ADDR addr_stop_tracing;
154 CORE_ADDR addr_flush_trace_buffer;
155 CORE_ADDR addr_about_to_request_buffer_space;
156 CORE_ADDR addr_trace_buffer_is_full;
157 CORE_ADDR addr_stopping_tracepoint;
158 CORE_ADDR addr_expr_eval_result;
159 CORE_ADDR addr_error_tracepoint;
160 CORE_ADDR addr_tracepoints;
161 CORE_ADDR addr_tracing;
162 CORE_ADDR addr_trace_buffer_ctrl;
163 CORE_ADDR addr_trace_buffer_ctrl_curr;
164 CORE_ADDR addr_trace_buffer_lo;
165 CORE_ADDR addr_trace_buffer_hi;
166 CORE_ADDR addr_traceframe_read_count;
167 CORE_ADDR addr_traceframe_write_count;
168 CORE_ADDR addr_traceframes_created;
169 CORE_ADDR addr_trace_state_variables;
170 CORE_ADDR addr_get_raw_reg;
171 CORE_ADDR addr_get_trace_state_variable_value;
172 CORE_ADDR addr_set_trace_state_variable_value;
173 CORE_ADDR addr_ust_loaded;
181 IPA_SYM(gdb_tp_heap_buffer),
182 IPA_SYM(gdb_jump_pad_buffer),
183 IPA_SYM(gdb_jump_pad_buffer_end),
184 IPA_SYM(gdb_trampoline_buffer),
185 IPA_SYM(gdb_trampoline_buffer_end),
186 IPA_SYM(gdb_trampoline_buffer_error),
188 IPA_SYM(gdb_collect),
189 IPA_SYM(stop_tracing),
190 IPA_SYM(flush_trace_buffer),
191 IPA_SYM(about_to_request_buffer_space),
192 IPA_SYM(trace_buffer_is_full),
193 IPA_SYM(stopping_tracepoint),
194 IPA_SYM(expr_eval_result),
195 IPA_SYM(error_tracepoint),
196 IPA_SYM(tracepoints),
198 IPA_SYM(trace_buffer_ctrl),
199 IPA_SYM(trace_buffer_ctrl_curr),
200 IPA_SYM(trace_buffer_lo),
201 IPA_SYM(trace_buffer_hi),
202 IPA_SYM(traceframe_read_count),
203 IPA_SYM(traceframe_write_count),
204 IPA_SYM(traceframes_created),
205 IPA_SYM(trace_state_variables),
206 IPA_SYM(get_raw_reg),
207 IPA_SYM(get_trace_state_variable_value),
208 IPA_SYM(set_trace_state_variable_value),
212 static struct ipa_sym_addresses ipa_sym_addrs;
214 static int read_inferior_integer (CORE_ADDR symaddr, int *val);
216 /* Returns true if both the in-process agent library and the static
217 tracepoints libraries are loaded in the inferior, and agent has
218 capability on static tracepoints. */
221 in_process_agent_supports_ust (void)
225 if (!agent_loaded_p ())
227 warning ("In-process agent not loaded");
231 if (agent_capability_check (AGENT_CAPA_STATIC_TRACE))
233 /* Agent understands static tracepoint, then check whether UST is in
234 fact loaded in the inferior. */
235 if (read_inferior_integer (ipa_sym_addrs.addr_ust_loaded, &loaded))
237 warning ("Error reading ust_loaded in lib");
248 write_e_ipa_not_loaded (char *buffer)
251 "E.In-process agent library not loaded in process. "
252 "Fast and static tracepoints unavailable.");
255 /* Write an error to BUFFER indicating that UST isn't loaded in the
259 write_e_ust_not_loaded (char *buffer)
263 "E.UST library not loaded in process. "
264 "Static tracepoints unavailable.");
266 sprintf (buffer, "E.GDBserver was built without static tracepoints support");
270 /* If the in-process agent library isn't loaded in the inferior, write
271 an error to BUFFER, and return 1. Otherwise, return 0. */
274 maybe_write_ipa_not_loaded (char *buffer)
276 if (!agent_loaded_p ())
278 write_e_ipa_not_loaded (buffer);
284 /* If the in-process agent library and the ust (static tracepoints)
285 library aren't loaded in the inferior, write an error to BUFFER,
286 and return 1. Otherwise, return 0. */
289 maybe_write_ipa_ust_not_loaded (char *buffer)
291 if (!agent_loaded_p ())
293 write_e_ipa_not_loaded (buffer);
296 else if (!in_process_agent_supports_ust ())
298 write_e_ust_not_loaded (buffer);
304 /* Cache all future symbols that the tracepoints module might request.
305 We can not request symbols at arbitrary states in the remote
306 protocol, only when the client tells us that new symbols are
307 available. So when we load the in-process library, make sure to
308 check the entire list. */
311 tracepoint_look_up_symbols (void)
315 if (agent_loaded_p ())
318 for (i = 0; i < sizeof (symbol_list) / sizeof (symbol_list[0]); i++)
321 (CORE_ADDR *) ((char *) &ipa_sym_addrs + symbol_list[i].offset);
323 if (look_up_one_symbol (symbol_list[i].name, addrp, 1) == 0)
326 debug_printf ("symbol `%s' not found\n", symbol_list[i].name);
331 agent_look_up_symbols (NULL);
336 /* GDBserver places a breakpoint on the IPA's version (which is a nop)
337 of the "stop_tracing" function. When this breakpoint is hit,
338 tracing stopped in the IPA for some reason. E.g., due to
339 tracepoint reaching the pass count, hitting conditional expression
340 evaluation error, etc.
342 The IPA's trace buffer is never in circular tracing mode: instead,
343 GDBserver's is, and whenever the in-process buffer fills, it calls
344 "flush_trace_buffer", which triggers an internal breakpoint.
345 GDBserver reacts to this breakpoint by pulling the meanwhile
346 collected data. Old frames discarding is always handled on the
349 #ifdef IN_PROCESS_AGENT
351 read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
353 memcpy (myaddr, (void *) (uintptr_t) memaddr, len);
357 /* Call this in the functions where GDBserver places a breakpoint, so
358 that the compiler doesn't try to be clever and skip calling the
359 function at all. This is necessary, even if we tell the compiler
360 to not inline said functions. */
362 #if defined(__GNUC__)
363 # define UNKNOWN_SIDE_EFFECTS() asm ("")
365 # define UNKNOWN_SIDE_EFFECTS() do {} while (0)
368 IP_AGENT_EXPORT_FUNC void
371 /* GDBserver places breakpoint here. */
372 UNKNOWN_SIDE_EFFECTS();
375 IP_AGENT_EXPORT_FUNC void
376 flush_trace_buffer (void)
378 /* GDBserver places breakpoint here. */
379 UNKNOWN_SIDE_EFFECTS();
384 #ifndef IN_PROCESS_AGENT
386 tracepoint_handler (CORE_ADDR address)
388 trace_debug ("tracepoint_handler: tracepoint at 0x%s hit",
393 /* Breakpoint at "stop_tracing" in the inferior lib. */
394 struct breakpoint *stop_tracing_bkpt;
395 static int stop_tracing_handler (CORE_ADDR);
397 /* Breakpoint at "flush_trace_buffer" in the inferior lib. */
398 struct breakpoint *flush_trace_buffer_bkpt;
399 static int flush_trace_buffer_handler (CORE_ADDR);
401 static void download_trace_state_variables (void);
402 static void upload_fast_traceframes (void);
404 static int run_inferior_command (char *cmd, int len);
407 read_inferior_integer (CORE_ADDR symaddr, int *val)
409 return read_inferior_memory (symaddr, (unsigned char *) val,
414 static int tracepoint_send_agent (struct tracepoint *tpoint);
417 read_inferior_uinteger (CORE_ADDR symaddr, unsigned int *val)
419 return read_inferior_memory (symaddr, (unsigned char *) val,
424 read_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR *val)
426 void *pval = (void *) (uintptr_t) val;
429 ret = read_inferior_memory (symaddr, (unsigned char *) &pval, sizeof (pval));
430 *val = (uintptr_t) pval;
435 write_inferior_data_pointer (CORE_ADDR symaddr, CORE_ADDR val)
437 void *pval = (void *) (uintptr_t) val;
438 return write_inferior_memory (symaddr,
439 (unsigned char *) &pval, sizeof (pval));
443 write_inferior_integer (CORE_ADDR symaddr, int val)
445 return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val));
449 write_inferior_uinteger (CORE_ADDR symaddr, unsigned int val)
451 return write_inferior_memory (symaddr, (unsigned char *) &val, sizeof (val));
454 static CORE_ADDR target_malloc (ULONGEST size);
455 static int write_inferior_data_ptr (CORE_ADDR where, CORE_ADDR ptr);
457 #define COPY_FIELD_TO_BUF(BUF, OBJ, FIELD) \
459 memcpy (BUF, &(OBJ)->FIELD, sizeof ((OBJ)->FIELD)); \
460 BUF += sizeof ((OBJ)->FIELD); \
465 /* Operations on various types of tracepoint actions. */
467 struct tracepoint_action;
469 struct tracepoint_action_ops
471 /* Download tracepoint action ACTION to IPA. Return the address of action
473 CORE_ADDR (*download) (const struct tracepoint_action *action);
475 /* Send ACTION to agent via command buffer started from BUFFER. Return
476 updated head of command buffer. */
477 char* (*send) (char *buffer, const struct tracepoint_action *action);
480 /* Base action. Concrete actions inherit this. */
482 struct tracepoint_action
484 #ifndef IN_PROCESS_AGENT
485 const struct tracepoint_action_ops *ops;
490 /* An 'M' (collect memory) action. */
491 struct collect_memory_action
493 struct tracepoint_action base;
500 /* An 'R' (collect registers) action. */
502 struct collect_registers_action
504 struct tracepoint_action base;
507 /* An 'X' (evaluate expression) action. */
509 struct eval_expr_action
511 struct tracepoint_action base;
513 struct agent_expr *expr;
516 /* An 'L' (collect static trace data) action. */
517 struct collect_static_trace_data_action
519 struct tracepoint_action base;
522 #ifndef IN_PROCESS_AGENT
524 m_tracepoint_action_download (const struct tracepoint_action *action)
526 int size_in_ipa = (sizeof (struct collect_memory_action)
527 - offsetof (struct tracepoint_action, type));
528 CORE_ADDR ipa_action = target_malloc (size_in_ipa);
530 write_inferior_memory (ipa_action, (unsigned char *) &action->type,
536 m_tracepoint_action_send (char *buffer, const struct tracepoint_action *action)
538 struct collect_memory_action *maction
539 = (struct collect_memory_action *) action;
541 COPY_FIELD_TO_BUF (buffer, maction, addr);
542 COPY_FIELD_TO_BUF (buffer, maction, len);
543 COPY_FIELD_TO_BUF (buffer, maction, basereg);
548 static const struct tracepoint_action_ops m_tracepoint_action_ops =
550 m_tracepoint_action_download,
551 m_tracepoint_action_send,
555 r_tracepoint_action_download (const struct tracepoint_action *action)
557 int size_in_ipa = (sizeof (struct collect_registers_action)
558 - offsetof (struct tracepoint_action, type));
559 CORE_ADDR ipa_action = target_malloc (size_in_ipa);
561 write_inferior_memory (ipa_action, (unsigned char *) &action->type,
568 r_tracepoint_action_send (char *buffer, const struct tracepoint_action *action)
573 static const struct tracepoint_action_ops r_tracepoint_action_ops =
575 r_tracepoint_action_download,
576 r_tracepoint_action_send,
579 static CORE_ADDR download_agent_expr (struct agent_expr *expr);
582 x_tracepoint_action_download (const struct tracepoint_action *action)
584 int size_in_ipa = (sizeof (struct eval_expr_action)
585 - offsetof (struct tracepoint_action, type));
586 CORE_ADDR ipa_action = target_malloc (size_in_ipa);
589 write_inferior_memory (ipa_action, (unsigned char *) &action->type,
591 expr = download_agent_expr (((struct eval_expr_action *)action)->expr);
592 write_inferior_data_ptr (ipa_action + offsetof (struct eval_expr_action, expr)
593 - offsetof (struct tracepoint_action, type),
599 /* Copy agent expression AEXPR to buffer pointed by P. If AEXPR is NULL,
600 copy 0 to P. Return updated header of buffer. */
603 agent_expr_send (char *p, const struct agent_expr *aexpr)
605 /* Copy the length of condition first, and then copy its
614 memcpy (p, &aexpr->length, 4);
617 memcpy (p, aexpr->bytes, aexpr->length);
624 x_tracepoint_action_send ( char *buffer, const struct tracepoint_action *action)
626 struct eval_expr_action *eaction = (struct eval_expr_action *) action;
628 return agent_expr_send (buffer, eaction->expr);
631 static const struct tracepoint_action_ops x_tracepoint_action_ops =
633 x_tracepoint_action_download,
634 x_tracepoint_action_send,
638 l_tracepoint_action_download (const struct tracepoint_action *action)
640 int size_in_ipa = (sizeof (struct collect_static_trace_data_action)
641 - offsetof (struct tracepoint_action, type));
642 CORE_ADDR ipa_action = target_malloc (size_in_ipa);
644 write_inferior_memory (ipa_action, (unsigned char *) &action->type,
651 l_tracepoint_action_send (char *buffer, const struct tracepoint_action *action)
656 static const struct tracepoint_action_ops l_tracepoint_action_ops =
658 l_tracepoint_action_download,
659 l_tracepoint_action_send,
663 /* This structure describes a piece of the source-level definition of
664 the tracepoint. The contents are not interpreted by the target,
665 but preserved verbatim for uploading upon reconnection. */
669 /* The type of string, such as "cond" for a conditional. */
672 /* The source-level string itself. For the sake of target
673 debugging, we store it in plaintext, even though it is always
674 transmitted in hex. */
677 /* Link to the next one in the list. We link them in the order
678 received, in case some make up an ordered list of commands or
680 struct source_string *next;
685 /* Trap based tracepoint. */
688 /* A fast tracepoint implemented with a jump instead of a trap. */
691 /* A static tracepoint, implemented by a program call into a tracing
696 struct tracepoint_hit_ctx;
698 typedef enum eval_result_type (*condfn) (unsigned char *,
701 /* The definition of a tracepoint. */
703 /* Tracepoints may have multiple locations, each at a different
704 address. This can occur with optimizations, template
705 instantiation, etc. Since the locations may be in different
706 scopes, the conditions and actions may be different for each
707 location. Our target version of tracepoints is more like GDB's
708 notion of "breakpoint locations", but we have almost nothing that
709 is not per-location, so we bother having two kinds of objects. The
710 key consequence is that numbers are not unique, and that it takes
711 both number and address to identify a tracepoint uniquely. */
715 /* The number of the tracepoint, as specified by GDB. Several
716 tracepoint objects here may share a number. */
719 /* Address at which the tracepoint is supposed to trigger. Several
720 tracepoints may share an address. */
723 /* Tracepoint type. */
724 enum tracepoint_type type;
726 /* True if the tracepoint is currently enabled. */
729 /* The number of single steps that will be performed after each
733 /* The number of times the tracepoint may be hit before it will
734 terminate the entire tracing run. */
737 /* Pointer to the agent expression that is the tracepoint's
738 conditional, or NULL if the tracepoint is unconditional. */
739 struct agent_expr *cond;
741 /* The list of actions to take when the tracepoint triggers. */
743 struct tracepoint_action **actions;
745 /* Count of the times we've hit this tracepoint during the run.
746 Note that while-stepping steps are not counted as "hits". */
749 /* Cached sum of the sizes of traceframes created by this point. */
750 uint64_t traceframe_usage;
752 CORE_ADDR compiled_cond;
754 /* Link to the next tracepoint in the list. */
755 struct tracepoint *next;
757 #ifndef IN_PROCESS_AGENT
758 /* The list of actions to take when the tracepoint triggers, in
759 string/packet form. */
762 /* The collection of strings that describe the tracepoint as it was
763 entered into GDB. These are not used by the target, but are
764 reported back to GDB upon reconnection. */
765 struct source_string *source_strings;
767 /* The number of bytes displaced by fast tracepoints. It may subsume
768 multiple instructions, for multi-byte fast tracepoints. This
769 field is only valid for fast tracepoints. */
772 /* Only for fast tracepoints. */
773 CORE_ADDR obj_addr_on_target;
775 /* Address range where the original instruction under a fast
776 tracepoint was relocated to. (_end is actually one byte past
778 CORE_ADDR adjusted_insn_addr;
779 CORE_ADDR adjusted_insn_addr_end;
781 /* The address range of the piece of the jump pad buffer that was
782 assigned to this fast tracepoint. (_end is actually one byte
785 CORE_ADDR jump_pad_end;
787 /* The address range of the piece of the trampoline buffer that was
788 assigned to this fast tracepoint. (_end is actually one byte
790 CORE_ADDR trampoline;
791 CORE_ADDR trampoline_end;
793 /* The list of actions to take while in a stepping loop. These
794 fields are only valid for patch-based tracepoints. */
795 int num_step_actions;
796 struct tracepoint_action **step_actions;
797 /* Same, but in string/packet form. */
798 char **step_actions_str;
800 /* Handle returned by the breakpoint or tracepoint module when we
801 inserted the trap or jump, or hooked into a static tracepoint.
802 NULL if we haven't inserted it yet. */
808 #ifndef IN_PROCESS_AGENT
810 /* Given `while-stepping', a thread may be collecting data for more
811 than one tracepoint simultaneously. On the other hand, the same
812 tracepoint with a while-stepping action may be hit by more than one
813 thread simultaneously (but not quite, each thread could be handling
814 a different step). Each thread holds a list of these objects,
815 representing the current step of each while-stepping action being
820 struct wstep_state *next;
822 /* The tracepoint number. */
824 /* The tracepoint's address. */
825 CORE_ADDR tp_address;
827 /* The number of the current step in this 'while-stepping'
836 /* The linked list of all tracepoints. Marked explicitly as used as
837 the in-process library doesn't use it for the fast tracepoints
839 IP_AGENT_EXPORT_VAR struct tracepoint *tracepoints;
841 /* The first tracepoint to exceed its pass count. */
843 IP_AGENT_EXPORT_VAR struct tracepoint *stopping_tracepoint;
845 /* True if the trace buffer is full or otherwise no longer usable. */
847 IP_AGENT_EXPORT_VAR int trace_buffer_is_full;
849 /* The first error that occurred during expression evaluation. */
851 /* Stored as an int to avoid the IPA ABI being dependent on whatever
852 the compiler decides to use for the enum's underlying type. Holds
853 enum eval_result_type values. */
854 IP_AGENT_EXPORT_VAR int expr_eval_result = expr_eval_no_error;
858 #ifndef IN_PROCESS_AGENT
860 /* Pointer to the last tracepoint in the list, new tracepoints are
861 linked in at the end. */
863 static struct tracepoint *last_tracepoint;
865 static const char *eval_result_names[] =
867 "terror:in the attic", /* this should never be reported */
868 "terror:empty expression",
869 "terror:empty stack",
870 "terror:stack overflow",
871 "terror:stack underflow",
872 "terror:unhandled opcode",
873 "terror:unrecognized opcode",
874 "terror:divide by zero"
879 /* The tracepoint in which the error occurred. */
882 IP_AGENT_EXPORT_VAR struct tracepoint *error_tracepoint;
885 struct trace_state_variable
887 /* This is the name of the variable as used in GDB. The target
888 doesn't use the name, but needs to have it for saving and
889 reconnection purposes. */
892 /* This number identifies the variable uniquely. Numbers may be
893 assigned either by the target (in the case of builtin variables),
894 or by GDB, and are presumed unique during the course of a trace
898 /* The variable's initial value, a 64-bit signed integer always. */
899 LONGEST initial_value;
901 /* The variable's value, a 64-bit signed integer always. */
904 /* Pointer to a getter function, used to supply computed values. */
905 LONGEST (*getter) (void);
907 /* Link to the next variable. */
908 struct trace_state_variable *next;
911 /* Linked list of all trace state variables. */
913 #ifdef IN_PROCESS_AGENT
914 struct trace_state_variable *alloced_trace_state_variables;
917 IP_AGENT_EXPORT_VAR struct trace_state_variable *trace_state_variables;
919 /* The results of tracing go into a fixed-size space known as the
920 "trace buffer". Because usage follows a limited number of
921 patterns, we manage it ourselves rather than with malloc. Basic
922 rules are that we create only one trace frame at a time, each is
923 variable in size, they are never moved once created, and we only
924 discard if we are doing a circular buffer, and then only the oldest
925 ones. Each trace frame includes its own size, so we don't need to
926 link them together, and the trace frame number is relative to the
927 first one, so we don't need to record numbers. A trace frame also
928 records the number of the tracepoint that created it. The data
929 itself is a series of blocks, each introduced by a single character
930 and with a defined format. Each type of block has enough
931 type/length info to allow scanners to jump quickly from one block
932 to the next without reading each byte in the block. */
934 /* Trace buffer management would be simple - advance a free pointer
935 from beginning to end, then stop - were it not for the circular
936 buffer option, which is a useful way to prevent a trace run from
937 stopping prematurely because the buffer filled up. In the circular
938 case, the location of the first trace frame (trace_buffer_start)
939 moves as old trace frames are discarded. Also, since we grow trace
940 frames incrementally as actions are performed, we wrap around to
941 the beginning of the trace buffer. This is per-block, so each
942 block within a trace frame remains contiguous. Things get messy
943 when the wrapped-around trace frame is the one being discarded; the
944 free space ends up in two parts at opposite ends of the buffer. */
947 # if defined(__GNUC__)
948 # define ATTR_PACKED __attribute__ ((packed))
950 # define ATTR_PACKED /* nothing */
954 /* The data collected at a tracepoint hit. This object should be as
955 small as possible, since there may be a great many of them. We do
956 not need to keep a frame number, because they are all sequential
957 and there are no deletions; so the Nth frame in the buffer is
958 always frame number N. */
962 /* Number of the tracepoint that collected this traceframe. A value
963 of 0 indicates the current end of the trace buffer. We make this
964 a 16-bit field because it's never going to happen that GDB's
965 numbering of tracepoints reaches 32,000. */
968 /* The size of the data in this trace frame. We limit this to 32
969 bits, even on a 64-bit target, because it's just implausible that
970 one is validly going to collect 4 gigabytes of data at a single
972 unsigned int data_size : 32;
974 /* The base of the trace data, which is contiguous from this point. */
975 unsigned char data[0];
979 /* The size of the EOB marker, in bytes. A traceframe with zeroed
980 fields (and no data) marks the end of trace data. */
981 #define TRACEFRAME_EOB_MARKER_SIZE offsetof (struct traceframe, data)
983 /* The traceframe to be used as the source of data to send back to
984 GDB. A value of -1 means to get data from the live program. */
986 int current_traceframe = -1;
988 /* This flag is true if the trace buffer is circular, meaning that
989 when it fills, the oldest trace frames are discarded in order to
992 #ifndef IN_PROCESS_AGENT
993 static int circular_trace_buffer;
996 /* Size of the trace buffer. */
998 static LONGEST trace_buffer_size;
1002 /* Pointer to the block of memory that traceframes all go into. */
1004 IP_AGENT_EXPORT_VAR unsigned char *trace_buffer_lo;
1006 /* Pointer to the end of the trace buffer, more precisely to the byte
1007 after the end of the buffer. */
1009 IP_AGENT_EXPORT_VAR unsigned char *trace_buffer_hi;
1013 /* Control structure holding the read/write/etc. pointers into the
1014 trace buffer. We need more than one of these to implement a
1015 transaction-like mechanism to garantees that both GDBserver and the
1016 in-process agent can try to change the trace buffer
1019 struct trace_buffer_control
1021 /* Pointer to the first trace frame in the buffer. In the
1022 non-circular case, this is equal to trace_buffer_lo, otherwise it
1023 moves around in the buffer. */
1024 unsigned char *start;
1026 /* Pointer to the free part of the trace buffer. Note that we clear
1027 several bytes at and after this pointer, so that traceframe
1028 scans/searches terminate properly. */
1029 unsigned char *free;
1031 /* Pointer to the byte after the end of the free part. Note that
1032 this may be smaller than trace_buffer_free in the circular case,
1033 and means that the free part is in two pieces. Initially it is
1034 equal to trace_buffer_hi, then is generally equivalent to
1035 trace_buffer_start. */
1036 unsigned char *end_free;
1038 /* Pointer to the wraparound. If not equal to trace_buffer_hi, then
1039 this is the point at which the trace data breaks, and resumes at
1041 unsigned char *wrap;
1044 /* Same as above, to be used by GDBserver when updating the in-process
1046 struct ipa_trace_buffer_control
1055 /* We have possibly both GDBserver and an inferior thread accessing
1056 the same IPA trace buffer memory. The IPA is the producer (tries
1057 to put new frames in the buffer), while GDBserver occasionally
1058 consumes them, that is, flushes the IPA's buffer into its own
1059 buffer. Both sides need to update the trace buffer control
1060 pointers (current head, tail, etc.). We can't use a global lock to
1061 synchronize the accesses, as otherwise we could deadlock GDBserver
1062 (if the thread holding the lock stops for a signal, say). So
1063 instead of that, we use a transaction scheme where GDBserver writes
1064 always prevail over the IPAs writes, and, we have the IPA detect
1065 the commit failure/overwrite, and retry the whole attempt. This is
1066 mainly implemented by having a global token object that represents
1067 who wrote last to the buffer control structure. We need to freeze
1068 any inferior writing to the buffer while GDBserver touches memory,
1069 so that the inferior can correctly detect that GDBserver had been
1070 there, otherwise, it could mistakingly think its commit was
1071 successful; that's implemented by simply having GDBserver set a
1072 breakpoint the inferior hits if it is the critical region.
1074 There are three cycling trace buffer control structure copies
1075 (buffer head, tail, etc.), with the token object including an index
1076 indicating which is current live copy. The IPA tentatively builds
1077 an updated copy in a non-current control structure, while GDBserver
1078 always clobbers the current version directly. The IPA then tries
1079 to atomically "commit" its version; if GDBserver clobbered the
1080 structure meanwhile, that will fail, and the IPA restarts the
1083 Listing the step in further detail, we have:
1085 In-process agent (producer):
1087 - passes by `about_to_request_buffer_space' breakpoint/lock
1089 - reads current token, extracts current trace buffer control index,
1090 and starts tentatively updating the rightmost one (0->1, 1->2,
1091 2->0). Note that only one inferior thread is executing this code
1092 at any given time, due to an outer lock in the jump pads.
1094 - updates counters, and tries to commit the token.
1096 - passes by second `about_to_request_buffer_space' breakpoint/lock,
1097 leaving the sync region.
1099 - checks if the update was effective.
1101 - if trace buffer was found full, hits flush_trace_buffer
1102 breakpoint, and restarts later afterwards.
1104 GDBserver (consumer):
1106 - sets `about_to_request_buffer_space' breakpoint/lock.
1108 - updates the token unconditionally, using the current buffer
1109 control index, since it knows that the IP agent always writes to
1110 the rightmost, and due to the breakpoint, at most one IP thread
1111 can try to update the trace buffer concurrently to GDBserver, so
1112 there will be no danger of trace buffer control index wrap making
1113 the IPA write to the same index as GDBserver.
1115 - flushes the IP agent's trace buffer completely, and updates the
1116 current trace buffer control structure. GDBserver *always* wins.
1118 - removes the `about_to_request_buffer_space' breakpoint.
1120 The token is stored in the `trace_buffer_ctrl_curr' variable.
1121 Internally, it's bits are defined as:
1123 |-------------+-----+-------------+--------+-------------+--------------|
1124 | Bit offsets | 31 | 30 - 20 | 19 | 18-8 | 7-0 |
1125 |-------------+-----+-------------+--------+-------------+--------------|
1126 | What | GSB | PC (11-bit) | unused | CC (11-bit) | TBCI (8-bit) |
1127 |-------------+-----+-------------+--------+-------------+--------------|
1129 GSB - GDBserver Stamp Bit
1130 PC - Previous Counter
1131 CC - Current Counter
1132 TBCI - Trace Buffer Control Index
1135 An IPA update of `trace_buffer_ctrl_curr' does:
1137 - read CC from the current token, save as PC.
1139 - atomically tries to write PC+1,CC
1141 A GDBserver update of `trace_buffer_ctrl_curr' does:
1143 - reads PC and CC from the current token.
1148 /* These are the bits of `trace_buffer_ctrl_curr' that are reserved
1149 for the counters described below. The cleared bits are used to
1150 hold the index of the items of the `trace_buffer_ctrl' array that
1152 #define GDBSERVER_FLUSH_COUNT_MASK 0xfffffff0
1154 /* `trace_buffer_ctrl_curr' contains two counters. The `previous'
1155 counter, and the `current' counter. */
1157 #define GDBSERVER_FLUSH_COUNT_MASK_PREV 0x7ff00000
1158 #define GDBSERVER_FLUSH_COUNT_MASK_CURR 0x0007ff00
1160 /* When GDBserver update the IP agent's `trace_buffer_ctrl_curr', it
1161 always stamps this bit as set. */
1162 #define GDBSERVER_UPDATED_FLUSH_COUNT_BIT 0x80000000
1164 #ifdef IN_PROCESS_AGENT
1165 IP_AGENT_EXPORT_VAR struct trace_buffer_control trace_buffer_ctrl[3];
1166 IP_AGENT_EXPORT_VAR unsigned int trace_buffer_ctrl_curr;
1168 # define TRACE_BUFFER_CTRL_CURR \
1169 (trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK)
1173 /* The GDBserver side agent only needs one instance of this object, as
1174 it doesn't need to sync with itself. Define it as array anyway so
1175 that the rest of the code base doesn't need to care for the
1177 struct trace_buffer_control trace_buffer_ctrl[1];
1178 # define TRACE_BUFFER_CTRL_CURR 0
1181 /* These are convenience macros used to access the current trace
1182 buffer control in effect. */
1183 #define trace_buffer_start (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].start)
1184 #define trace_buffer_free (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].free)
1185 #define trace_buffer_end_free \
1186 (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].end_free)
1187 #define trace_buffer_wrap (trace_buffer_ctrl[TRACE_BUFFER_CTRL_CURR].wrap)
1190 /* Macro that returns a pointer to the first traceframe in the buffer. */
1192 #define FIRST_TRACEFRAME() ((struct traceframe *) trace_buffer_start)
1194 /* Macro that returns a pointer to the next traceframe in the buffer.
1195 If the computed location is beyond the wraparound point, subtract
1196 the offset of the wraparound. */
1198 #define NEXT_TRACEFRAME_1(TF) \
1199 (((unsigned char *) (TF)) + sizeof (struct traceframe) + (TF)->data_size)
1201 #define NEXT_TRACEFRAME(TF) \
1202 ((struct traceframe *) (NEXT_TRACEFRAME_1 (TF) \
1203 - ((NEXT_TRACEFRAME_1 (TF) >= trace_buffer_wrap) \
1204 ? (trace_buffer_wrap - trace_buffer_lo) \
1207 /* The difference between these counters represents the total number
1208 of complete traceframes present in the trace buffer. The IP agent
1209 writes to the write count, GDBserver writes to read count. */
1211 IP_AGENT_EXPORT_VAR unsigned int traceframe_write_count;
1212 IP_AGENT_EXPORT_VAR unsigned int traceframe_read_count;
1214 /* Convenience macro. */
1216 #define traceframe_count \
1217 ((unsigned int) (traceframe_write_count - traceframe_read_count))
1219 /* The count of all traceframes created in the current run, including
1220 ones that were discarded to make room. */
1222 IP_AGENT_EXPORT_VAR int traceframes_created;
1224 #ifndef IN_PROCESS_AGENT
1226 /* Read-only regions are address ranges whose contents don't change,
1227 and so can be read from target memory even while looking at a trace
1228 frame. Without these, disassembly for instance will likely fail,
1229 because the program code is not usually collected into a trace
1230 frame. This data structure does not need to be very complicated or
1231 particularly efficient, it's only going to be used occasionally,
1232 and only by some commands. */
1234 struct readonly_region
1236 /* The bounds of the region. */
1237 CORE_ADDR start, end;
1239 /* Link to the next one. */
1240 struct readonly_region *next;
1243 /* Linked list of readonly regions. This list stays in effect from
1244 one tstart to the next. */
1246 static struct readonly_region *readonly_regions;
1250 /* The global that controls tracing overall. */
1252 IP_AGENT_EXPORT_VAR int tracing;
1254 #ifndef IN_PROCESS_AGENT
1256 /* Controls whether tracing should continue after GDB disconnects. */
1258 int disconnected_tracing;
1260 /* The reason for the last tracing run to have stopped. We initialize
1261 to a distinct string so that GDB can distinguish between "stopped
1262 after running" and "stopped because never run" cases. */
1264 static const char *tracing_stop_reason = "tnotrun";
1266 static int tracing_stop_tpnum;
1268 /* 64-bit timestamps for the trace run's start and finish, expressed
1269 in microseconds from the Unix epoch. */
1271 LONGEST tracing_start_time;
1272 LONGEST tracing_stop_time;
1274 /* The (optional) user-supplied name of the user that started the run.
1275 This is an arbitrary string, and may be NULL. */
1277 char *tracing_user_name;
1279 /* Optional user-supplied text describing the run. This is
1280 an arbitrary string, and may be NULL. */
1282 char *tracing_notes;
1284 /* Optional user-supplied text explaining a tstop command. This is an
1285 arbitrary string, and may be NULL. */
1287 char *tracing_stop_note;
1291 /* Functions local to this file. */
1293 /* Base "class" for tracepoint type specific data to be passed down to
1294 collect_data_at_tracepoint. */
1295 struct tracepoint_hit_ctx
1297 enum tracepoint_type type;
1300 #ifdef IN_PROCESS_AGENT
1302 /* Fast/jump tracepoint specific data to be passed down to
1303 collect_data_at_tracepoint. */
1304 struct fast_tracepoint_ctx
1306 struct tracepoint_hit_ctx base;
1308 struct regcache regcache;
1309 int regcache_initted;
1310 unsigned char *regspace;
1312 unsigned char *regs;
1313 struct tracepoint *tpoint;
1316 /* Static tracepoint specific data to be passed down to
1317 collect_data_at_tracepoint. */
1318 struct static_tracepoint_ctx
1320 struct tracepoint_hit_ctx base;
1322 /* The regcache corresponding to the registers state at the time of
1323 the tracepoint hit. Initialized lazily, from REGS. */
1324 struct regcache regcache;
1325 int regcache_initted;
1327 /* The buffer space REGCACHE above uses. We use a separate buffer
1328 instead of letting the regcache malloc for both signal safety and
1329 performance reasons; this is allocated on the stack instead. */
1330 unsigned char *regspace;
1332 /* The register buffer as passed on by lttng/ust. */
1333 struct registers *regs;
1335 /* The "printf" formatter and the args the user passed to the marker
1336 call. We use this to be able to collect "static trace data"
1341 /* The GDB tracepoint matching the probed marker that was "hit". */
1342 struct tracepoint *tpoint;
1347 /* Static tracepoint specific data to be passed down to
1348 collect_data_at_tracepoint. */
1349 struct trap_tracepoint_ctx
1351 struct tracepoint_hit_ctx base;
1353 struct regcache *regcache;
1358 #ifndef IN_PROCESS_AGENT
1359 static CORE_ADDR traceframe_get_pc (struct traceframe *tframe);
1360 static int traceframe_read_tsv (int num, LONGEST *val);
1363 static int condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx,
1364 struct tracepoint *tpoint);
1366 #ifndef IN_PROCESS_AGENT
1367 static void clear_readonly_regions (void);
1368 static void clear_installed_tracepoints (void);
1371 static void collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx,
1373 struct tracepoint *tpoint);
1374 #ifndef IN_PROCESS_AGENT
1375 static void collect_data_at_step (struct tracepoint_hit_ctx *ctx,
1377 struct tracepoint *tpoint, int current_step);
1378 static void compile_tracepoint_condition (struct tracepoint *tpoint,
1379 CORE_ADDR *jump_entry);
1381 static void do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx,
1383 struct tracepoint *tpoint,
1384 struct traceframe *tframe,
1385 struct tracepoint_action *taction);
1387 #ifndef IN_PROCESS_AGENT
1388 static struct tracepoint *fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR);
1390 static void install_tracepoint (struct tracepoint *, char *own_buf);
1391 static void download_tracepoint (struct tracepoint *);
1392 static int install_fast_tracepoint (struct tracepoint *, char *errbuf);
1393 static void clone_fast_tracepoint (struct tracepoint *to,
1394 const struct tracepoint *from);
1397 static LONGEST get_timestamp (void);
1399 #if defined(__GNUC__)
1400 # define memory_barrier() asm volatile ("" : : : "memory")
1402 # define memory_barrier() do {} while (0)
1405 /* We only build the IPA if this builtin is supported, and there are
1406 no uses of this in GDBserver itself, so we're safe in defining this
1408 #define cmpxchg(mem, oldval, newval) \
1409 __sync_val_compare_and_swap (mem, oldval, newval)
1411 /* Record that an error occurred during expression evaluation. */
1414 record_tracepoint_error (struct tracepoint *tpoint, const char *which,
1415 enum eval_result_type rtype)
1417 trace_debug ("Tracepoint %d at %s %s eval reports error %d",
1418 tpoint->number, paddress (tpoint->address), which, rtype);
1420 #ifdef IN_PROCESS_AGENT
1421 /* Only record the first error we get. */
1422 if (cmpxchg (&expr_eval_result,
1424 rtype) != expr_eval_no_error)
1427 if (expr_eval_result != expr_eval_no_error)
1431 error_tracepoint = tpoint;
1434 /* Trace buffer management. */
1437 clear_trace_buffer (void)
1439 trace_buffer_start = trace_buffer_lo;
1440 trace_buffer_free = trace_buffer_lo;
1441 trace_buffer_end_free = trace_buffer_hi;
1442 trace_buffer_wrap = trace_buffer_hi;
1443 /* A traceframe with zeroed fields marks the end of trace data. */
1444 ((struct traceframe *) trace_buffer_free)->tpnum = 0;
1445 ((struct traceframe *) trace_buffer_free)->data_size = 0;
1446 traceframe_read_count = traceframe_write_count = 0;
1447 traceframes_created = 0;
1450 #ifndef IN_PROCESS_AGENT
1453 clear_inferior_trace_buffer (void)
1455 CORE_ADDR ipa_trace_buffer_lo;
1456 CORE_ADDR ipa_trace_buffer_hi;
1457 struct traceframe ipa_traceframe = { 0 };
1458 struct ipa_trace_buffer_control ipa_trace_buffer_ctrl;
1460 read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo,
1461 &ipa_trace_buffer_lo);
1462 read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi,
1463 &ipa_trace_buffer_hi);
1465 ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo;
1466 ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo;
1467 ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi;
1468 ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi;
1470 /* A traceframe with zeroed fields marks the end of trace data. */
1471 write_inferior_memory (ipa_sym_addrs.addr_trace_buffer_ctrl,
1472 (unsigned char *) &ipa_trace_buffer_ctrl,
1473 sizeof (ipa_trace_buffer_ctrl));
1475 write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr, 0);
1477 /* A traceframe with zeroed fields marks the end of trace data. */
1478 write_inferior_memory (ipa_trace_buffer_lo,
1479 (unsigned char *) &ipa_traceframe,
1480 sizeof (ipa_traceframe));
1482 write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count, 0);
1483 write_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count, 0);
1484 write_inferior_integer (ipa_sym_addrs.addr_traceframes_created, 0);
1490 init_trace_buffer (LONGEST bufsize)
1494 trace_buffer_size = bufsize;
1496 /* Make sure to internally allocate at least space for the EOB
1498 alloc_size = (bufsize < TRACEFRAME_EOB_MARKER_SIZE
1499 ? TRACEFRAME_EOB_MARKER_SIZE : bufsize);
1500 trace_buffer_lo = (unsigned char *) xrealloc (trace_buffer_lo, alloc_size);
1502 trace_buffer_hi = trace_buffer_lo + trace_buffer_size;
1504 clear_trace_buffer ();
1507 #ifdef IN_PROCESS_AGENT
1509 IP_AGENT_EXPORT_FUNC void
1510 about_to_request_buffer_space (void)
1512 /* GDBserver places breakpoint here while it goes about to flush
1513 data at random times. */
1514 UNKNOWN_SIDE_EFFECTS();
1519 /* Carve out a piece of the trace buffer, returning NULL in case of
1523 trace_buffer_alloc (size_t amt)
1525 unsigned char *rslt;
1526 struct trace_buffer_control *tbctrl;
1528 #ifdef IN_PROCESS_AGENT
1529 unsigned int prev, prev_filtered;
1530 unsigned int commit_count;
1531 unsigned int commit;
1532 unsigned int readout;
1534 struct traceframe *oldest;
1535 unsigned char *new_start;
1538 trace_debug ("Want to allocate %ld+%ld bytes in trace buffer",
1539 (long) amt, (long) sizeof (struct traceframe));
1541 /* Account for the EOB marker. */
1542 amt += TRACEFRAME_EOB_MARKER_SIZE;
1544 #ifdef IN_PROCESS_AGENT
1548 /* Read the current token and extract the index to try to write to,
1549 storing it in CURR. */
1550 prev = trace_buffer_ctrl_curr;
1551 prev_filtered = prev & ~GDBSERVER_FLUSH_COUNT_MASK;
1552 curr = prev_filtered + 1;
1556 about_to_request_buffer_space ();
1558 /* Start out with a copy of the current state. GDBserver may be
1559 midway writing to the PREV_FILTERED TBC, but, that's OK, we won't
1560 be able to commit anyway if that happens. */
1561 trace_buffer_ctrl[curr]
1562 = trace_buffer_ctrl[prev_filtered];
1563 trace_debug ("trying curr=%u", curr);
1565 /* The GDBserver's agent doesn't need all that syncing, and always
1566 updates TCB 0 (there's only one, mind you). */
1569 tbctrl = &trace_buffer_ctrl[curr];
1571 /* Offsets are easier to grok for debugging than raw addresses,
1572 especially for the small trace buffer sizes that are useful for
1574 trace_debug ("Trace buffer [%d] start=%d free=%d endfree=%d wrap=%d hi=%d",
1576 (int) (tbctrl->start - trace_buffer_lo),
1577 (int) (tbctrl->free - trace_buffer_lo),
1578 (int) (tbctrl->end_free - trace_buffer_lo),
1579 (int) (tbctrl->wrap - trace_buffer_lo),
1580 (int) (trace_buffer_hi - trace_buffer_lo));
1582 /* The algorithm here is to keep trying to get a contiguous block of
1583 the requested size, possibly discarding older traceframes to free
1584 up space. Since free space might come in one or two pieces,
1585 depending on whether discarded traceframes wrapped around at the
1586 high end of the buffer, we test both pieces after each
1590 /* First, if we have two free parts, try the upper one first. */
1591 if (tbctrl->end_free < tbctrl->free)
1593 if (tbctrl->free + amt <= trace_buffer_hi)
1594 /* We have enough in the upper part. */
1598 /* Our high part of free space wasn't enough. Give up
1599 on it for now, set wraparound. We will recover the
1600 space later, if/when the wrapped-around traceframe is
1602 trace_debug ("Upper part too small, setting wraparound");
1603 tbctrl->wrap = tbctrl->free;
1604 tbctrl->free = trace_buffer_lo;
1608 /* The normal case. */
1609 if (tbctrl->free + amt <= tbctrl->end_free)
1612 #ifdef IN_PROCESS_AGENT
1613 /* The IP Agent's buffer is always circular. It isn't used
1614 currently, but `circular_trace_buffer' could represent
1615 GDBserver's mode. If we didn't find space, ask GDBserver to
1618 flush_trace_buffer ();
1622 trace_debug ("gdbserver flushed buffer, retrying");
1626 /* GDBserver cancelled the tracing. Bail out as well. */
1629 /* If we're here, then neither part is big enough, and
1630 non-circular trace buffers are now full. */
1631 if (!circular_trace_buffer)
1633 trace_debug ("Not enough space in the trace buffer");
1637 trace_debug ("Need more space in the trace buffer");
1639 /* If we have a circular buffer, we can try discarding the
1640 oldest traceframe and see if that helps. */
1641 oldest = FIRST_TRACEFRAME ();
1642 if (oldest->tpnum == 0)
1644 /* Not good; we have no traceframes to free. Perhaps we're
1645 asking for a block that is larger than the buffer? In
1646 any case, give up. */
1647 trace_debug ("No traceframes to discard");
1651 /* We don't run this code in the in-process agent currently.
1652 E.g., we could leave the in-process agent in autonomous
1653 circular mode if we only have fast tracepoints. If we do
1654 that, then this bit becomes racy with GDBserver, which also
1655 writes to this counter. */
1656 --traceframe_write_count;
1658 new_start = (unsigned char *) NEXT_TRACEFRAME (oldest);
1659 /* If we freed the traceframe that wrapped around, go back
1660 to the non-wrap case. */
1661 if (new_start < tbctrl->start)
1663 trace_debug ("Discarding past the wraparound");
1664 tbctrl->wrap = trace_buffer_hi;
1666 tbctrl->start = new_start;
1667 tbctrl->end_free = tbctrl->start;
1669 trace_debug ("Discarded a traceframe\n"
1670 "Trace buffer [%d], start=%d free=%d "
1671 "endfree=%d wrap=%d hi=%d",
1673 (int) (tbctrl->start - trace_buffer_lo),
1674 (int) (tbctrl->free - trace_buffer_lo),
1675 (int) (tbctrl->end_free - trace_buffer_lo),
1676 (int) (tbctrl->wrap - trace_buffer_lo),
1677 (int) (trace_buffer_hi - trace_buffer_lo));
1679 /* Now go back around the loop. The discard might have resulted
1680 in either one or two pieces of free space, so we want to try
1681 both before freeing any more traceframes. */
1685 /* If we get here, we know we can provide the asked-for space. */
1687 rslt = tbctrl->free;
1689 /* Adjust the request back down, now that we know we have space for
1690 the marker, but don't commit to AMT yet, we may still need to
1691 restart the operation if GDBserver touches the trace buffer
1692 (obviously only important in the in-process agent's version). */
1693 tbctrl->free += (amt - sizeof (struct traceframe));
1695 /* Or not. If GDBserver changed the trace buffer behind our back,
1696 we get to restart a new allocation attempt. */
1698 #ifdef IN_PROCESS_AGENT
1699 /* Build the tentative token. */
1700 commit_count = (((prev & GDBSERVER_FLUSH_COUNT_MASK_CURR) + 0x100)
1701 & GDBSERVER_FLUSH_COUNT_MASK_CURR);
1702 commit = (((prev & GDBSERVER_FLUSH_COUNT_MASK_CURR) << 12)
1706 /* Try to commit it. */
1707 readout = cmpxchg (&trace_buffer_ctrl_curr, prev, commit);
1708 if (readout != prev)
1710 trace_debug ("GDBserver has touched the trace buffer, restarting."
1711 " (prev=%08x, commit=%08x, readout=%08x)",
1712 prev, commit, readout);
1716 /* Hold your horses here. Even if that change was committed,
1717 GDBserver could come in, and clobber it. We need to hold to be
1718 able to tell if GDBserver clobbers before or after we committed
1719 the change. Whenever GDBserver goes about touching the IPA
1720 buffer, it sets a breakpoint in this routine, so we have a sync
1722 about_to_request_buffer_space ();
1724 /* Check if the change has been effective, even if GDBserver stopped
1725 us at the breakpoint. */
1728 unsigned int refetch;
1732 refetch = trace_buffer_ctrl_curr;
1734 if (refetch == commit
1735 || ((refetch & GDBSERVER_FLUSH_COUNT_MASK_PREV) >> 12) == commit_count)
1738 trace_debug ("change is effective: (prev=%08x, commit=%08x, "
1739 "readout=%08x, refetch=%08x)",
1740 prev, commit, readout, refetch);
1744 trace_debug ("GDBserver has touched the trace buffer, not effective."
1745 " (prev=%08x, commit=%08x, readout=%08x, refetch=%08x)",
1746 prev, commit, readout, refetch);
1752 /* We have a new piece of the trace buffer. Hurray! */
1754 /* Add an EOB marker just past this allocation. */
1755 ((struct traceframe *) tbctrl->free)->tpnum = 0;
1756 ((struct traceframe *) tbctrl->free)->data_size = 0;
1758 /* Adjust the request back down, now that we know we have space for
1760 amt -= sizeof (struct traceframe);
1764 trace_debug ("Allocated %d bytes", (int) amt);
1765 trace_debug ("Trace buffer [%d] start=%d free=%d "
1766 "endfree=%d wrap=%d hi=%d",
1768 (int) (tbctrl->start - trace_buffer_lo),
1769 (int) (tbctrl->free - trace_buffer_lo),
1770 (int) (tbctrl->end_free - trace_buffer_lo),
1771 (int) (tbctrl->wrap - trace_buffer_lo),
1772 (int) (trace_buffer_hi - trace_buffer_lo));
1778 #ifndef IN_PROCESS_AGENT
1780 /* Return the total free space. This is not necessarily the largest
1781 block we can allocate, because of the two-part case. */
1786 if (trace_buffer_free <= trace_buffer_end_free)
1787 return trace_buffer_end_free - trace_buffer_free;
1789 return ((trace_buffer_end_free - trace_buffer_lo)
1790 + (trace_buffer_hi - trace_buffer_free));
1793 /* An 'S' in continuation packets indicates remainder are for
1796 static int seen_step_action_flag;
1798 /* Create a tracepoint (location) with given number and address. Add this
1799 new tracepoint to list and sort this list. */
1801 static struct tracepoint *
1802 add_tracepoint (int num, CORE_ADDR addr)
1804 struct tracepoint *tpoint, **tp_next;
1806 tpoint = XNEW (struct tracepoint);
1807 tpoint->number = num;
1808 tpoint->address = addr;
1809 tpoint->numactions = 0;
1810 tpoint->actions = NULL;
1811 tpoint->actions_str = NULL;
1812 tpoint->cond = NULL;
1813 tpoint->num_step_actions = 0;
1814 tpoint->step_actions = NULL;
1815 tpoint->step_actions_str = NULL;
1816 /* Start all off as regular (slow) tracepoints. */
1817 tpoint->type = trap_tracepoint;
1818 tpoint->orig_size = -1;
1819 tpoint->source_strings = NULL;
1820 tpoint->compiled_cond = 0;
1821 tpoint->handle = NULL;
1822 tpoint->next = NULL;
1824 /* Find a place to insert this tracepoint into list in order to keep
1825 the tracepoint list still in the ascending order. There may be
1826 multiple tracepoints at the same address as TPOINT's, and this
1827 guarantees TPOINT is inserted after all the tracepoints which are
1828 set at the same address. For example, fast tracepoints A, B, C are
1829 set at the same address, and D is to be insert at the same place as
1832 -->| A |--> | B |-->| C |->...
1834 One jump pad was created for tracepoint A, B, and C, and the target
1835 address of A is referenced/used in jump pad. So jump pad will let
1836 inferior jump to A. If D is inserted in front of A, like this,
1838 -->| D |-->| A |--> | B |-->| C |->...
1840 without updating jump pad, D is not reachable during collect, which
1841 is wrong. As we can see, the order of B, C and D doesn't matter, but
1842 A should always be the `first' one. */
1843 for (tp_next = &tracepoints;
1844 (*tp_next) != NULL && (*tp_next)->address <= tpoint->address;
1845 tp_next = &(*tp_next)->next)
1847 tpoint->next = *tp_next;
1849 last_tracepoint = tpoint;
1851 seen_step_action_flag = 0;
1856 #ifndef IN_PROCESS_AGENT
1858 /* Return the tracepoint with the given number and address, or NULL. */
1860 static struct tracepoint *
1861 find_tracepoint (int id, CORE_ADDR addr)
1863 struct tracepoint *tpoint;
1865 for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
1866 if (tpoint->number == id && tpoint->address == addr)
1872 /* Remove TPOINT from global list. */
1875 remove_tracepoint (struct tracepoint *tpoint)
1877 struct tracepoint *tp, *tp_prev;
1879 for (tp = tracepoints, tp_prev = NULL; tp && tp != tpoint;
1880 tp_prev = tp, tp = tp->next)
1886 tp_prev->next = tp->next;
1888 tracepoints = tp->next;
1894 /* There may be several tracepoints with the same number (because they
1895 are "locations", in GDB parlance); return the next one after the
1896 given tracepoint, or search from the beginning of the list if the
1897 first argument is NULL. */
1899 static struct tracepoint *
1900 find_next_tracepoint_by_number (struct tracepoint *prev_tp, int num)
1902 struct tracepoint *tpoint;
1905 tpoint = prev_tp->next;
1907 tpoint = tracepoints;
1908 for (; tpoint; tpoint = tpoint->next)
1909 if (tpoint->number == num)
1917 /* Append another action to perform when the tracepoint triggers. */
1920 add_tracepoint_action (struct tracepoint *tpoint, char *packet)
1926 seen_step_action_flag = 1;
1934 char *act_start = act;
1935 struct tracepoint_action *action = NULL;
1941 struct collect_memory_action *maction =
1942 XNEW (struct collect_memory_action);
1946 maction->base.type = *act;
1947 maction->base.ops = &m_tracepoint_action_ops;
1948 action = &maction->base;
1951 is_neg = (*act == '-');
1954 act = unpack_varlen_hex (act, &basereg);
1956 act = unpack_varlen_hex (act, &maction->addr);
1958 act = unpack_varlen_hex (act, &maction->len);
1959 maction->basereg = (is_neg
1962 trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)",
1963 pulongest (maction->len),
1964 paddress (maction->addr), maction->basereg);
1969 struct collect_registers_action *raction =
1970 XNEW (struct collect_registers_action);
1972 raction->base.type = *act;
1973 raction->base.ops = &r_tracepoint_action_ops;
1974 action = &raction->base;
1976 trace_debug ("Want to collect registers");
1978 /* skip past hex digits of mask for now */
1979 while (isxdigit(*act))
1985 struct collect_static_trace_data_action *raction =
1986 XNEW (struct collect_static_trace_data_action);
1988 raction->base.type = *act;
1989 raction->base.ops = &l_tracepoint_action_ops;
1990 action = &raction->base;
1992 trace_debug ("Want to collect static trace data");
1997 trace_debug ("Unexpected step action, ignoring");
2002 struct eval_expr_action *xaction = XNEW (struct eval_expr_action);
2004 xaction->base.type = *act;
2005 xaction->base.ops = &x_tracepoint_action_ops;
2006 action = &xaction->base;
2008 trace_debug ("Want to evaluate expression");
2009 xaction->expr = gdb_parse_agent_expr (&act);
2013 trace_debug ("unknown trace action '%c', ignoring...", *act);
2022 if (seen_step_action_flag)
2024 tpoint->num_step_actions++;
2026 tpoint->step_actions
2027 = XRESIZEVEC (struct tracepoint_action *, tpoint->step_actions,
2028 tpoint->num_step_actions);
2029 tpoint->step_actions_str
2030 = XRESIZEVEC (char *, tpoint->step_actions_str,
2031 tpoint->num_step_actions);
2032 tpoint->step_actions[tpoint->num_step_actions - 1] = action;
2033 tpoint->step_actions_str[tpoint->num_step_actions - 1]
2034 = savestring (act_start, act - act_start);
2038 tpoint->numactions++;
2040 = XRESIZEVEC (struct tracepoint_action *, tpoint->actions,
2041 tpoint->numactions);
2043 = XRESIZEVEC (char *, tpoint->actions_str, tpoint->numactions);
2044 tpoint->actions[tpoint->numactions - 1] = action;
2045 tpoint->actions_str[tpoint->numactions - 1]
2046 = savestring (act_start, act - act_start);
2053 /* Find or create a trace state variable with the given number. */
2055 static struct trace_state_variable *
2056 get_trace_state_variable (int num)
2058 struct trace_state_variable *tsv;
2060 #ifdef IN_PROCESS_AGENT
2061 /* Search for an existing variable. */
2062 for (tsv = alloced_trace_state_variables; tsv; tsv = tsv->next)
2063 if (tsv->number == num)
2067 /* Search for an existing variable. */
2068 for (tsv = trace_state_variables; tsv; tsv = tsv->next)
2069 if (tsv->number == num)
2075 /* Find or create a trace state variable with the given number. */
2077 static struct trace_state_variable *
2078 create_trace_state_variable (int num, int gdb)
2080 struct trace_state_variable *tsv;
2082 tsv = get_trace_state_variable (num);
2086 /* Create a new variable. */
2087 tsv = XNEW (struct trace_state_variable);
2089 tsv->initial_value = 0;
2093 #ifdef IN_PROCESS_AGENT
2096 tsv->next = alloced_trace_state_variables;
2097 alloced_trace_state_variables = tsv;
2102 tsv->next = trace_state_variables;
2103 trace_state_variables = tsv;
2108 IP_AGENT_EXPORT_FUNC LONGEST
2109 get_trace_state_variable_value (int num)
2111 struct trace_state_variable *tsv;
2113 tsv = get_trace_state_variable (num);
2117 trace_debug ("No trace state variable %d, skipping value get", num);
2121 /* Call a getter function if we have one. While it's tempting to
2122 set up something to only call the getter once per tracepoint hit,
2123 it could run afoul of thread races. Better to let the getter
2124 handle it directly, if necessary to worry about it. */
2126 tsv->value = (tsv->getter) ();
2128 trace_debug ("get_trace_state_variable_value(%d) ==> %s",
2129 num, plongest (tsv->value));
2134 IP_AGENT_EXPORT_FUNC void
2135 set_trace_state_variable_value (int num, LONGEST val)
2137 struct trace_state_variable *tsv;
2139 tsv = get_trace_state_variable (num);
2143 trace_debug ("No trace state variable %d, skipping value set", num);
2151 agent_get_trace_state_variable_value (int num)
2153 return get_trace_state_variable_value (num);
2157 agent_set_trace_state_variable_value (int num, LONGEST val)
2159 set_trace_state_variable_value (num, val);
2163 set_trace_state_variable_name (int num, const char *name)
2165 struct trace_state_variable *tsv;
2167 tsv = get_trace_state_variable (num);
2171 trace_debug ("No trace state variable %d, skipping name set", num);
2175 tsv->name = (char *) name;
2179 set_trace_state_variable_getter (int num, LONGEST (*getter) (void))
2181 struct trace_state_variable *tsv;
2183 tsv = get_trace_state_variable (num);
2187 trace_debug ("No trace state variable %d, skipping getter set", num);
2191 tsv->getter = getter;
2194 /* Add a raw traceframe for the given tracepoint. */
2196 static struct traceframe *
2197 add_traceframe (struct tracepoint *tpoint)
2199 struct traceframe *tframe;
2202 = (struct traceframe *) trace_buffer_alloc (sizeof (struct traceframe));
2207 tframe->tpnum = tpoint->number;
2208 tframe->data_size = 0;
2213 /* Add a block to the traceframe currently being worked on. */
2215 static unsigned char *
2216 add_traceframe_block (struct traceframe *tframe,
2217 struct tracepoint *tpoint, int amt)
2219 unsigned char *block;
2224 block = (unsigned char *) trace_buffer_alloc (amt);
2229 gdb_assert (tframe->tpnum == tpoint->number);
2231 tframe->data_size += amt;
2232 tpoint->traceframe_usage += amt;
2237 /* Flag that the current traceframe is finished. */
2240 finish_traceframe (struct traceframe *tframe)
2242 ++traceframe_write_count;
2243 ++traceframes_created;
2246 #ifndef IN_PROCESS_AGENT
2248 /* Given a traceframe number NUM, find the NUMth traceframe in the
2251 static struct traceframe *
2252 find_traceframe (int num)
2254 struct traceframe *tframe;
2257 for (tframe = FIRST_TRACEFRAME ();
2259 tframe = NEXT_TRACEFRAME (tframe))
2270 get_traceframe_address (struct traceframe *tframe)
2273 struct tracepoint *tpoint;
2275 addr = traceframe_get_pc (tframe);
2280 /* Fallback strategy, will be incorrect for while-stepping frames
2281 and multi-location tracepoints. */
2282 tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum);
2283 return tpoint->address;
2286 /* Search for the next traceframe whose address is inside or outside
2289 static struct traceframe *
2290 find_next_traceframe_in_range (CORE_ADDR lo, CORE_ADDR hi, int inside_p,
2293 struct traceframe *tframe;
2296 *tfnump = current_traceframe + 1;
2297 tframe = find_traceframe (*tfnump);
2298 /* The search is not supposed to wrap around. */
2305 for (; tframe->tpnum != 0; tframe = NEXT_TRACEFRAME (tframe))
2307 tfaddr = get_traceframe_address (tframe);
2309 ? (lo <= tfaddr && tfaddr <= hi)
2310 : (lo > tfaddr || tfaddr > hi))
2319 /* Search for the next traceframe recorded by the given tracepoint.
2320 Note that for multi-location tracepoints, this will find whatever
2321 location appears first. */
2323 static struct traceframe *
2324 find_next_traceframe_by_tracepoint (int num, int *tfnump)
2326 struct traceframe *tframe;
2328 *tfnump = current_traceframe + 1;
2329 tframe = find_traceframe (*tfnump);
2330 /* The search is not supposed to wrap around. */
2337 for (; tframe->tpnum != 0; tframe = NEXT_TRACEFRAME (tframe))
2339 if (tframe->tpnum == num)
2350 #ifndef IN_PROCESS_AGENT
2352 /* Clear all past trace state. */
2355 cmd_qtinit (char *packet)
2357 struct trace_state_variable *tsv, *prev, *next;
2359 /* Can't do this command without a pid attached. */
2360 if (current_thread == NULL)
2366 /* Make sure we don't try to read from a trace frame. */
2367 current_traceframe = -1;
2371 trace_debug ("Initializing the trace");
2373 clear_installed_tracepoints ();
2374 clear_readonly_regions ();
2377 last_tracepoint = NULL;
2379 /* Clear out any leftover trace state variables. Ones with target
2380 defined getters should be kept however. */
2382 tsv = trace_state_variables;
2385 trace_debug ("Looking at var %d", tsv->number);
2386 if (tsv->getter == NULL)
2392 trace_state_variables = next;
2393 trace_debug ("Deleting var %d", tsv->number);
2404 clear_trace_buffer ();
2405 clear_inferior_trace_buffer ();
2410 /* Unprobe the UST marker at ADDRESS. */
2413 unprobe_marker_at (CORE_ADDR address)
2415 char cmd[IPA_CMD_BUF_SIZE];
2417 sprintf (cmd, "unprobe_marker_at:%s", paddress (address));
2418 run_inferior_command (cmd, strlen (cmd) + 1);
2421 /* Restore the program to its pre-tracing state. This routine may be called
2422 in error situations, so it needs to be careful about only restoring
2423 from known-valid bits. */
2426 clear_installed_tracepoints (void)
2428 struct tracepoint *tpoint;
2429 struct tracepoint *prev_stpoint;
2433 prev_stpoint = NULL;
2435 /* Restore any bytes overwritten by tracepoints. */
2436 for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
2438 /* Catch the case where we might try to remove a tracepoint that
2439 was never actually installed. */
2440 if (tpoint->handle == NULL)
2442 trace_debug ("Tracepoint %d at 0x%s was "
2443 "never installed, nothing to clear",
2444 tpoint->number, paddress (tpoint->address));
2448 switch (tpoint->type)
2450 case trap_tracepoint:
2451 delete_breakpoint (tpoint->handle);
2453 case fast_tracepoint:
2454 delete_fast_tracepoint_jump (tpoint->handle);
2456 case static_tracepoint:
2457 if (prev_stpoint != NULL
2458 && prev_stpoint->address == tpoint->address)
2459 /* Nothing to do. We already unprobed a tracepoint set at
2460 this marker address (and there can only be one probe
2465 unprobe_marker_at (tpoint->address);
2466 prev_stpoint = tpoint;
2471 tpoint->handle = NULL;
2477 /* Parse a packet that defines a tracepoint. */
2480 cmd_qtdp (char *own_buf)
2483 /* Whether there is a trailing hyphen at the end of the QTDP packet. */
2484 int trail_hyphen = 0;
2488 struct tracepoint *tpoint;
2490 char *packet = own_buf;
2492 packet += strlen ("QTDP:");
2494 /* A hyphen at the beginning marks a packet specifying actions for a
2495 tracepoint already supplied. */
2502 packet = unpack_varlen_hex (packet, &num);
2503 ++packet; /* skip a colon */
2504 packet = unpack_varlen_hex (packet, &addr);
2505 ++packet; /* skip a colon */
2507 /* See if we already have this tracepoint. */
2508 tpoint = find_tracepoint (num, addr);
2512 /* Duplicate tracepoints are never allowed. */
2515 trace_debug ("Tracepoint error: tracepoint %d"
2516 " at 0x%s already exists",
2517 (int) num, paddress (addr));
2518 write_enn (own_buf);
2522 tpoint = add_tracepoint (num, addr);
2524 tpoint->enabled = (*packet == 'E');
2525 ++packet; /* skip 'E' */
2526 ++packet; /* skip a colon */
2527 packet = unpack_varlen_hex (packet, &count);
2528 tpoint->step_count = count;
2529 ++packet; /* skip a colon */
2530 packet = unpack_varlen_hex (packet, &count);
2531 tpoint->pass_count = count;
2532 /* See if we have any of the additional optional fields. */
2533 while (*packet == ':')
2538 tpoint->type = fast_tracepoint;
2540 packet = unpack_varlen_hex (packet, &count);
2541 tpoint->orig_size = count;
2543 else if (*packet == 'S')
2545 tpoint->type = static_tracepoint;
2548 else if (*packet == 'X')
2550 actparm = (char *) packet;
2551 tpoint->cond = gdb_parse_agent_expr (&actparm);
2554 else if (*packet == '-')
2556 else if (*packet == '\0')
2559 trace_debug ("Unknown optional tracepoint field");
2564 trace_debug ("Also has actions\n");
2567 trace_debug ("Defined %stracepoint %d at 0x%s, "
2568 "enabled %d step %" PRIu64 " pass %" PRIu64,
2569 tpoint->type == fast_tracepoint ? "fast "
2570 : tpoint->type == static_tracepoint ? "static " : "",
2571 tpoint->number, paddress (tpoint->address), tpoint->enabled,
2572 tpoint->step_count, tpoint->pass_count);
2575 add_tracepoint_action (tpoint, packet);
2578 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
2579 (int) num, paddress (addr));
2580 write_enn (own_buf);
2584 /* Install tracepoint during tracing only once for each tracepoint location.
2585 For each tracepoint loc, GDB may send multiple QTDP packets, and we can
2586 determine the last QTDP packet for one tracepoint location by checking
2587 trailing hyphen in QTDP packet. */
2588 if (tracing && !trail_hyphen)
2590 struct tracepoint *tp = NULL;
2592 /* Pause all threads temporarily while we patch tracepoints. */
2595 /* download_tracepoint will update global `tracepoints'
2596 list, so it is unsafe to leave threads in jump pad. */
2597 stabilize_threads ();
2599 /* Freeze threads. */
2603 if (tpoint->type != trap_tracepoint)
2605 /* Find another fast or static tracepoint at the same address. */
2606 for (tp = tracepoints; tp; tp = tp->next)
2608 if (tp->address == tpoint->address && tp->type == tpoint->type
2609 && tp->number != tpoint->number)
2613 /* TPOINT is installed at the same address as TP. */
2616 if (tpoint->type == fast_tracepoint)
2617 clone_fast_tracepoint (tpoint, tp);
2618 else if (tpoint->type == static_tracepoint)
2619 tpoint->handle = (void *) -1;
2623 if (use_agent && tpoint->type == fast_tracepoint
2624 && agent_capability_check (AGENT_CAPA_FAST_TRACE))
2626 /* Download and install fast tracepoint by agent. */
2627 if (tracepoint_send_agent (tpoint) == 0)
2631 write_enn (own_buf);
2632 remove_tracepoint (tpoint);
2637 download_tracepoint (tpoint);
2639 if (tpoint->type == trap_tracepoint || tp == NULL)
2641 install_tracepoint (tpoint, own_buf);
2642 if (strcmp (own_buf, "OK") != 0)
2643 remove_tracepoint (tpoint);
2657 cmd_qtdpsrc (char *own_buf)
2659 ULONGEST num, addr, start, slen;
2660 struct tracepoint *tpoint;
2661 char *packet = own_buf;
2662 char *saved, *srctype, *src;
2664 struct source_string *last, *newlast;
2666 packet += strlen ("QTDPsrc:");
2668 packet = unpack_varlen_hex (packet, &num);
2669 ++packet; /* skip a colon */
2670 packet = unpack_varlen_hex (packet, &addr);
2671 ++packet; /* skip a colon */
2673 /* See if we already have this tracepoint. */
2674 tpoint = find_tracepoint (num, addr);
2678 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
2679 (int) num, paddress (addr));
2680 write_enn (own_buf);
2685 packet = strchr (packet, ':');
2686 srctype = (char *) xmalloc (packet - saved + 1);
2687 memcpy (srctype, saved, packet - saved);
2688 srctype[packet - saved] = '\0';
2690 packet = unpack_varlen_hex (packet, &start);
2691 ++packet; /* skip a colon */
2692 packet = unpack_varlen_hex (packet, &slen);
2693 ++packet; /* skip a colon */
2694 src = (char *) xmalloc (slen + 1);
2695 nbytes = hex2bin (packet, (gdb_byte *) src, strlen (packet) / 2);
2698 newlast = XNEW (struct source_string);
2699 newlast->type = srctype;
2701 newlast->next = NULL;
2702 /* Always add a source string to the end of the list;
2703 this keeps sequences of actions/commands in the right
2705 if (tpoint->source_strings)
2707 for (last = tpoint->source_strings; last->next; last = last->next)
2709 last->next = newlast;
2712 tpoint->source_strings = newlast;
2718 cmd_qtdv (char *own_buf)
2720 ULONGEST num, val, builtin;
2723 struct trace_state_variable *tsv;
2724 char *packet = own_buf;
2726 packet += strlen ("QTDV:");
2728 packet = unpack_varlen_hex (packet, &num);
2729 ++packet; /* skip a colon */
2730 packet = unpack_varlen_hex (packet, &val);
2731 ++packet; /* skip a colon */
2732 packet = unpack_varlen_hex (packet, &builtin);
2733 ++packet; /* skip a colon */
2735 nbytes = strlen (packet) / 2;
2736 varname = (char *) xmalloc (nbytes + 1);
2737 nbytes = hex2bin (packet, (gdb_byte *) varname, nbytes);
2738 varname[nbytes] = '\0';
2740 tsv = create_trace_state_variable (num, 1);
2741 tsv->initial_value = (LONGEST) val;
2742 tsv->name = varname;
2744 set_trace_state_variable_value (num, (LONGEST) val);
2750 cmd_qtenable_disable (char *own_buf, int enable)
2752 char *packet = own_buf;
2754 struct tracepoint *tp;
2756 packet += strlen (enable ? "QTEnable:" : "QTDisable:");
2757 packet = unpack_varlen_hex (packet, &num);
2758 ++packet; /* skip a colon */
2759 packet = unpack_varlen_hex (packet, &addr);
2761 tp = find_tracepoint (num, addr);
2765 if ((enable && tp->enabled) || (!enable && !tp->enabled))
2767 trace_debug ("Tracepoint %d at 0x%s is already %s",
2768 (int) num, paddress (addr),
2769 enable ? "enabled" : "disabled");
2774 trace_debug ("%s tracepoint %d at 0x%s",
2775 enable ? "Enabling" : "Disabling",
2776 (int) num, paddress (addr));
2778 tp->enabled = enable;
2780 if (tp->type == fast_tracepoint || tp->type == static_tracepoint)
2783 int offset = offsetof (struct tracepoint, enabled);
2784 CORE_ADDR obj_addr = tp->obj_addr_on_target + offset;
2786 ret = prepare_to_access_memory ();
2789 trace_debug ("Failed to temporarily stop inferior threads");
2790 write_enn (own_buf);
2794 ret = write_inferior_integer (obj_addr, enable);
2795 done_accessing_memory ();
2799 trace_debug ("Cannot write enabled flag into "
2800 "inferior process memory");
2801 write_enn (own_buf);
2810 trace_debug ("Tracepoint %d at 0x%s not found",
2811 (int) num, paddress (addr));
2812 write_enn (own_buf);
2817 cmd_qtv (char *own_buf)
2822 char *packet = own_buf;
2824 packet += strlen ("qTV:");
2825 unpack_varlen_hex (packet, &num);
2827 if (current_traceframe >= 0)
2829 err = traceframe_read_tsv ((int) num, &val);
2832 strcpy (own_buf, "U");
2836 /* Only make tsv's be undefined before the first trace run. After a
2837 trace run is over, the user might want to see the last value of
2838 the tsv, and it might not be available in a traceframe. */
2839 else if (!tracing && strcmp (tracing_stop_reason, "tnotrun") == 0)
2841 strcpy (own_buf, "U");
2845 val = get_trace_state_variable_value (num);
2847 sprintf (own_buf, "V%s", phex_nz (val, 0));
2850 /* Clear out the list of readonly regions. */
2853 clear_readonly_regions (void)
2855 struct readonly_region *roreg;
2857 while (readonly_regions)
2859 roreg = readonly_regions;
2860 readonly_regions = readonly_regions->next;
2865 /* Parse the collection of address ranges whose contents GDB believes
2866 to be unchanging and so can be read directly from target memory
2867 even while looking at a traceframe. */
2870 cmd_qtro (char *own_buf)
2872 ULONGEST start, end;
2873 struct readonly_region *roreg;
2874 char *packet = own_buf;
2876 trace_debug ("Want to mark readonly regions");
2878 clear_readonly_regions ();
2880 packet += strlen ("QTro");
2882 while (*packet == ':')
2884 ++packet; /* skip a colon */
2885 packet = unpack_varlen_hex (packet, &start);
2886 ++packet; /* skip a comma */
2887 packet = unpack_varlen_hex (packet, &end);
2889 roreg = XNEW (struct readonly_region);
2890 roreg->start = start;
2892 roreg->next = readonly_regions;
2893 readonly_regions = roreg;
2894 trace_debug ("Added readonly region from 0x%s to 0x%s",
2895 paddress (roreg->start), paddress (roreg->end));
2901 /* Test to see if the given range is in our list of readonly ranges.
2902 We only test for being entirely within a range, GDB is not going to
2903 send a single memory packet that spans multiple regions. */
2906 in_readonly_region (CORE_ADDR addr, ULONGEST length)
2908 struct readonly_region *roreg;
2910 for (roreg = readonly_regions; roreg; roreg = roreg->next)
2911 if (roreg->start <= addr && (addr + length - 1) <= roreg->end)
2917 static CORE_ADDR gdb_jump_pad_head;
2919 /* Return the address of the next free jump space. */
2922 get_jump_space_head (void)
2924 if (gdb_jump_pad_head == 0)
2926 if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer,
2927 &gdb_jump_pad_head))
2929 internal_error (__FILE__, __LINE__,
2930 "error extracting jump_pad_buffer");
2934 return gdb_jump_pad_head;
2937 /* Reserve USED bytes from the jump space. */
2940 claim_jump_space (ULONGEST used)
2942 trace_debug ("claim_jump_space reserves %s bytes at %s",
2943 pulongest (used), paddress (gdb_jump_pad_head));
2944 gdb_jump_pad_head += used;
2947 static CORE_ADDR trampoline_buffer_head = 0;
2948 static CORE_ADDR trampoline_buffer_tail;
2950 /* Reserve USED bytes from the trampoline buffer and return the
2951 address of the start of the reserved space in TRAMPOLINE. Returns
2952 non-zero if the space is successfully claimed. */
2955 claim_trampoline_space (ULONGEST used, CORE_ADDR *trampoline)
2957 if (!trampoline_buffer_head)
2959 if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer,
2960 &trampoline_buffer_tail))
2962 internal_error (__FILE__, __LINE__,
2963 "error extracting trampoline_buffer");
2966 if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end,
2967 &trampoline_buffer_head))
2969 internal_error (__FILE__, __LINE__,
2970 "error extracting trampoline_buffer_end");
2974 /* Start claiming space from the top of the trampoline space. If
2975 the space is located at the bottom of the virtual address space,
2976 this reduces the possibility that corruption will occur if a null
2977 pointer is used to write to memory. */
2978 if (trampoline_buffer_head - trampoline_buffer_tail < used)
2980 trace_debug ("claim_trampoline_space failed to reserve %s bytes",
2985 trampoline_buffer_head -= used;
2987 trace_debug ("claim_trampoline_space reserves %s bytes at %s",
2988 pulongest (used), paddress (trampoline_buffer_head));
2990 *trampoline = trampoline_buffer_head;
2994 /* Returns non-zero if there is space allocated for use in trampolines
2995 for fast tracepoints. */
2998 have_fast_tracepoint_trampoline_buffer (char *buf)
3000 CORE_ADDR trampoline_end, errbuf;
3002 if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end,
3005 internal_error (__FILE__, __LINE__,
3006 "error extracting trampoline_buffer_end");
3012 strcpy (buf, "was claiming");
3013 if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_error,
3016 internal_error (__FILE__, __LINE__,
3017 "error extracting errbuf");
3020 read_inferior_memory (errbuf, (unsigned char *) buf, 100);
3023 return trampoline_end != 0;
3026 /* Ask the IPA to probe the marker at ADDRESS. Returns -1 if running
3027 the command fails, or 0 otherwise. If the command ran
3028 successfully, but probing the marker failed, ERROUT will be filled
3029 with the error to reply to GDB, and -1 is also returned. This
3030 allows directly passing IPA errors to GDB. */
3033 probe_marker_at (CORE_ADDR address, char *errout)
3035 char cmd[IPA_CMD_BUF_SIZE];
3038 sprintf (cmd, "probe_marker_at:%s", paddress (address));
3039 err = run_inferior_command (cmd, strlen (cmd) + 1);
3045 strcpy (errout, cmd);
3054 clone_fast_tracepoint (struct tracepoint *to, const struct tracepoint *from)
3056 to->jump_pad = from->jump_pad;
3057 to->jump_pad_end = from->jump_pad_end;
3058 to->trampoline = from->trampoline;
3059 to->trampoline_end = from->trampoline_end;
3060 to->adjusted_insn_addr = from->adjusted_insn_addr;
3061 to->adjusted_insn_addr_end = from->adjusted_insn_addr_end;
3062 to->handle = from->handle;
3064 gdb_assert (from->handle);
3065 inc_ref_fast_tracepoint_jump ((struct fast_tracepoint_jump *) from->handle);
3068 #define MAX_JUMP_SIZE 20
3070 /* Install fast tracepoint. Return 0 if successful, otherwise return
3074 install_fast_tracepoint (struct tracepoint *tpoint, char *errbuf)
3076 CORE_ADDR jentry, jump_entry;
3077 CORE_ADDR trampoline;
3078 ULONGEST trampoline_size;
3080 /* The jump to the jump pad of the last fast tracepoint
3082 unsigned char fjump[MAX_JUMP_SIZE];
3083 ULONGEST fjump_size;
3085 if (tpoint->orig_size < target_get_min_fast_tracepoint_insn_len ())
3087 trace_debug ("Requested a fast tracepoint on an instruction "
3088 "that is of less than the minimum length.");
3092 jentry = jump_entry = get_jump_space_head ();
3095 trampoline_size = 0;
3097 /* Install the jump pad. */
3098 err = install_fast_tracepoint_jump_pad (tpoint->obj_addr_on_target,
3100 ipa_sym_addrs.addr_gdb_collect,
3101 ipa_sym_addrs.addr_collecting,
3104 &trampoline, &trampoline_size,
3106 &tpoint->adjusted_insn_addr,
3107 &tpoint->adjusted_insn_addr_end,
3114 tpoint->handle = set_fast_tracepoint_jump (tpoint->address, fjump,
3117 if (tpoint->handle != NULL)
3119 tpoint->jump_pad = jump_entry;
3120 tpoint->jump_pad_end = jentry;
3121 tpoint->trampoline = trampoline;
3122 tpoint->trampoline_end = trampoline + trampoline_size;
3124 /* Pad to 8-byte alignment. */
3125 jentry = ((jentry + 7) & ~0x7);
3126 claim_jump_space (jentry - jump_entry);
3133 /* Install tracepoint TPOINT, and write reply message in OWN_BUF. */
3136 install_tracepoint (struct tracepoint *tpoint, char *own_buf)
3138 tpoint->handle = NULL;
3141 if (tpoint->type == trap_tracepoint)
3143 /* Tracepoints are installed as memory breakpoints. Just go
3144 ahead and install the trap. The breakpoints module
3145 handles duplicated breakpoints, and the memory read
3146 routine handles un-patching traps from memory reads. */
3147 tpoint->handle = set_breakpoint_at (tpoint->address,
3148 tracepoint_handler);
3150 else if (tpoint->type == fast_tracepoint || tpoint->type == static_tracepoint)
3152 if (!agent_loaded_p ())
3154 trace_debug ("Requested a %s tracepoint, but fast "
3155 "tracepoints aren't supported.",
3156 tpoint->type == static_tracepoint ? "static" : "fast");
3157 write_e_ipa_not_loaded (own_buf);
3160 if (tpoint->type == static_tracepoint
3161 && !in_process_agent_supports_ust ())
3163 trace_debug ("Requested a static tracepoint, but static "
3164 "tracepoints are not supported.");
3165 write_e_ust_not_loaded (own_buf);
3169 if (tpoint->type == fast_tracepoint)
3170 install_fast_tracepoint (tpoint, own_buf);
3173 if (probe_marker_at (tpoint->address, own_buf) == 0)
3174 tpoint->handle = (void *) -1;
3179 internal_error (__FILE__, __LINE__, "Unknown tracepoint type");
3181 if (tpoint->handle == NULL)
3183 if (*own_buf == '\0')
3184 write_enn (own_buf);
3190 static void download_tracepoint_1 (struct tracepoint *tpoint);
3193 cmd_qtstart (char *packet)
3195 struct tracepoint *tpoint, *prev_ftpoint, *prev_stpoint;
3196 CORE_ADDR tpptr = 0, prev_tpptr = 0;
3198 trace_debug ("Starting the trace");
3200 /* Pause all threads temporarily while we patch tracepoints. */
3203 /* Get threads out of jump pads. Safe to do here, since this is a
3204 top level command. And, required to do here, since we're
3205 deleting/rewriting jump pads. */
3207 stabilize_threads ();
3209 /* Freeze threads. */
3212 /* Sync the fast tracepoints list in the inferior ftlib. */
3213 if (agent_loaded_p ())
3214 download_trace_state_variables ();
3216 /* No previous fast tpoint yet. */
3217 prev_ftpoint = NULL;
3219 /* No previous static tpoint yet. */
3220 prev_stpoint = NULL;
3224 /* Start out empty. */
3225 if (agent_loaded_p ())
3226 write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, 0);
3228 /* Download and install tracepoints. */
3229 for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
3231 /* Ensure all the hit counts start at zero. */
3232 tpoint->hit_count = 0;
3233 tpoint->traceframe_usage = 0;
3235 if (tpoint->type == trap_tracepoint)
3237 /* Tracepoints are installed as memory breakpoints. Just go
3238 ahead and install the trap. The breakpoints module
3239 handles duplicated breakpoints, and the memory read
3240 routine handles un-patching traps from memory reads. */
3241 tpoint->handle = set_breakpoint_at (tpoint->address,
3242 tracepoint_handler);
3244 else if (tpoint->type == fast_tracepoint
3245 || tpoint->type == static_tracepoint)
3247 if (maybe_write_ipa_not_loaded (packet))
3249 trace_debug ("Requested a %s tracepoint, but fast "
3250 "tracepoints aren't supported.",
3251 tpoint->type == static_tracepoint
3252 ? "static" : "fast");
3256 if (tpoint->type == fast_tracepoint)
3259 = use_agent && agent_capability_check (AGENT_CAPA_FAST_TRACE);
3261 if (prev_ftpoint != NULL
3262 && prev_ftpoint->address == tpoint->address)
3265 tracepoint_send_agent (tpoint);
3267 download_tracepoint_1 (tpoint);
3269 clone_fast_tracepoint (tpoint, prev_ftpoint);
3273 /* Tracepoint is installed successfully? */
3276 /* Download and install fast tracepoint by agent. */
3278 installed = !tracepoint_send_agent (tpoint);
3281 download_tracepoint_1 (tpoint);
3282 installed = !install_fast_tracepoint (tpoint, packet);
3286 prev_ftpoint = tpoint;
3291 if (!in_process_agent_supports_ust ())
3293 trace_debug ("Requested a static tracepoint, but static "
3294 "tracepoints are not supported.");
3298 download_tracepoint_1 (tpoint);
3299 /* Can only probe a given marker once. */
3300 if (prev_stpoint != NULL
3301 && prev_stpoint->address == tpoint->address)
3302 tpoint->handle = (void *) -1;
3305 if (probe_marker_at (tpoint->address, packet) == 0)
3307 tpoint->handle = (void *) -1;
3309 /* So that we can handle multiple static tracepoints
3310 at the same address easily. */
3311 prev_stpoint = tpoint;
3317 tpptr = tpoint->obj_addr_on_target;
3319 if (tpoint == tracepoints)
3320 /* First object in list, set the head pointer in the
3322 write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints, tpptr);
3324 write_inferior_data_ptr (prev_tpptr + offsetof (struct tracepoint,
3329 /* Any failure in the inner loop is sufficient cause to give
3331 if (tpoint->handle == NULL)
3335 /* Any error in tracepoint insertion is unacceptable; better to
3336 address the problem now, than end up with a useless or misleading
3340 clear_installed_tracepoints ();
3341 if (*packet == '\0')
3347 stopping_tracepoint = NULL;
3348 trace_buffer_is_full = 0;
3349 expr_eval_result = expr_eval_no_error;
3350 error_tracepoint = NULL;
3351 tracing_start_time = get_timestamp ();
3353 /* Tracing is now active, hits will now start being logged. */
3356 if (agent_loaded_p ())
3358 if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 1))
3360 internal_error (__FILE__, __LINE__,
3361 "Error setting tracing variable in lib");
3364 if (write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint,
3367 internal_error (__FILE__, __LINE__,
3368 "Error clearing stopping_tracepoint variable"
3372 if (write_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full, 0))
3374 internal_error (__FILE__, __LINE__,
3375 "Error clearing trace_buffer_is_full variable"
3379 stop_tracing_bkpt = set_breakpoint_at (ipa_sym_addrs.addr_stop_tracing,
3380 stop_tracing_handler);
3381 if (stop_tracing_bkpt == NULL)
3382 error ("Error setting stop_tracing breakpoint");
3384 flush_trace_buffer_bkpt
3385 = set_breakpoint_at (ipa_sym_addrs.addr_flush_trace_buffer,
3386 flush_trace_buffer_handler);
3387 if (flush_trace_buffer_bkpt == NULL)
3388 error ("Error setting flush_trace_buffer breakpoint");
3396 /* End a tracing run, filling in a stop reason to report back to GDB,
3397 and removing the tracepoints from the code. */
3404 trace_debug ("Tracing is already off, ignoring");
3408 trace_debug ("Stopping the trace");
3410 /* Pause all threads before removing fast jumps from memory,
3411 breakpoints, and touching IPA state variables (inferior memory).
3412 Some thread may hit the internal tracing breakpoints, or be
3413 collecting this moment, but that's ok, we don't release the
3414 tpoint object's memory or the jump pads here (we only do that
3415 when we're sure we can move all threads out of the jump pads).
3416 We can't now, since we may be getting here due to the inferior
3417 agent calling us. */
3420 /* Stop logging. Tracepoints can still be hit, but they will not be
3423 if (agent_loaded_p ())
3425 if (write_inferior_integer (ipa_sym_addrs.addr_tracing, 0))
3427 internal_error (__FILE__, __LINE__,
3428 "Error clearing tracing variable in lib");
3432 tracing_stop_time = get_timestamp ();
3433 tracing_stop_reason = "t???";
3434 tracing_stop_tpnum = 0;
3435 if (stopping_tracepoint)
3437 trace_debug ("Stopping the trace because "
3438 "tracepoint %d was hit %" PRIu64 " times",
3439 stopping_tracepoint->number,
3440 stopping_tracepoint->pass_count);
3441 tracing_stop_reason = "tpasscount";
3442 tracing_stop_tpnum = stopping_tracepoint->number;
3444 else if (trace_buffer_is_full)
3446 trace_debug ("Stopping the trace because the trace buffer is full");
3447 tracing_stop_reason = "tfull";
3449 else if (expr_eval_result != expr_eval_no_error)
3451 trace_debug ("Stopping the trace because of an expression eval error");
3452 tracing_stop_reason = eval_result_names[expr_eval_result];
3453 tracing_stop_tpnum = error_tracepoint->number;
3455 #ifndef IN_PROCESS_AGENT
3456 else if (!gdb_connected ())
3458 trace_debug ("Stopping the trace because GDB disconnected");
3459 tracing_stop_reason = "tdisconnected";
3464 trace_debug ("Stopping the trace because of a tstop command");
3465 tracing_stop_reason = "tstop";
3468 stopping_tracepoint = NULL;
3469 error_tracepoint = NULL;
3471 /* Clear out the tracepoints. */
3472 clear_installed_tracepoints ();
3474 if (agent_loaded_p ())
3476 /* Pull in fast tracepoint trace frames from the inferior lib
3477 buffer into our buffer, even if our buffer is already full,
3478 because we want to present the full number of created frames
3479 in addition to what fit in the trace buffer. */
3480 upload_fast_traceframes ();
3483 if (stop_tracing_bkpt != NULL)
3485 delete_breakpoint (stop_tracing_bkpt);
3486 stop_tracing_bkpt = NULL;
3489 if (flush_trace_buffer_bkpt != NULL)
3491 delete_breakpoint (flush_trace_buffer_bkpt);
3492 flush_trace_buffer_bkpt = NULL;
3499 stop_tracing_handler (CORE_ADDR addr)
3501 trace_debug ("lib hit stop_tracing");
3503 /* Don't actually handle it here. When we stop tracing we remove
3504 breakpoints from the inferior, and that is not allowed in a
3505 breakpoint handler (as the caller is walking the breakpoint
3511 flush_trace_buffer_handler (CORE_ADDR addr)
3513 trace_debug ("lib hit flush_trace_buffer");
3518 cmd_qtstop (char *packet)
3525 cmd_qtdisconnected (char *own_buf)
3528 char *packet = own_buf;
3530 packet += strlen ("QTDisconnected:");
3532 unpack_varlen_hex (packet, &setting);
3536 disconnected_tracing = setting;
3540 cmd_qtframe (char *own_buf)
3542 ULONGEST frame, pc, lo, hi, num;
3544 struct traceframe *tframe;
3545 char *packet = own_buf;
3547 packet += strlen ("QTFrame:");
3549 if (startswith (packet, "pc:"))
3551 packet += strlen ("pc:");
3552 unpack_varlen_hex (packet, &pc);
3553 trace_debug ("Want to find next traceframe at pc=0x%s", paddress (pc));
3554 tframe = find_next_traceframe_in_range (pc, pc, 1, &tfnum);
3556 else if (startswith (packet, "range:"))
3558 packet += strlen ("range:");
3559 packet = unpack_varlen_hex (packet, &lo);
3561 unpack_varlen_hex (packet, &hi);
3562 trace_debug ("Want to find next traceframe in the range 0x%s to 0x%s",
3563 paddress (lo), paddress (hi));
3564 tframe = find_next_traceframe_in_range (lo, hi, 1, &tfnum);
3566 else if (startswith (packet, "outside:"))
3568 packet += strlen ("outside:");
3569 packet = unpack_varlen_hex (packet, &lo);
3571 unpack_varlen_hex (packet, &hi);
3572 trace_debug ("Want to find next traceframe "
3573 "outside the range 0x%s to 0x%s",
3574 paddress (lo), paddress (hi));
3575 tframe = find_next_traceframe_in_range (lo, hi, 0, &tfnum);
3577 else if (startswith (packet, "tdp:"))
3579 packet += strlen ("tdp:");
3580 unpack_varlen_hex (packet, &num);
3582 trace_debug ("Want to find next traceframe for tracepoint %d", tpnum);
3583 tframe = find_next_traceframe_by_tracepoint (tpnum, &tfnum);
3587 unpack_varlen_hex (packet, &frame);
3588 tfnum = (int) frame;
3591 trace_debug ("Want to stop looking at traceframes");
3592 current_traceframe = -1;
3596 trace_debug ("Want to look at traceframe %d", tfnum);
3597 tframe = find_traceframe (tfnum);
3602 current_traceframe = tfnum;
3603 sprintf (own_buf, "F%xT%x", tfnum, tframe->tpnum);
3606 sprintf (own_buf, "F-1");
3610 cmd_qtstatus (char *packet)
3612 char *stop_reason_rsp = NULL;
3613 char *buf1, *buf2, *buf3;
3617 /* Translate the plain text of the notes back into hex for
3620 str = (tracing_user_name ? tracing_user_name : "");
3621 slen = strlen (str);
3622 buf1 = (char *) alloca (slen * 2 + 1);
3623 bin2hex ((gdb_byte *) str, buf1, slen);
3625 str = (tracing_notes ? tracing_notes : "");
3626 slen = strlen (str);
3627 buf2 = (char *) alloca (slen * 2 + 1);
3628 bin2hex ((gdb_byte *) str, buf2, slen);
3630 str = (tracing_stop_note ? tracing_stop_note : "");
3631 slen = strlen (str);
3632 buf3 = (char *) alloca (slen * 2 + 1);
3633 bin2hex ((gdb_byte *) str, buf3, slen);
3635 trace_debug ("Returning trace status as %d, stop reason %s",
3636 tracing, tracing_stop_reason);
3638 if (agent_loaded_p ())
3642 upload_fast_traceframes ();
3647 stop_reason_rsp = (char *) tracing_stop_reason;
3649 /* The user visible error string in terror needs to be hex encoded.
3650 We leave it as plain string in `tracing_stop_reason' to ease
3652 if (startswith (stop_reason_rsp, "terror:"))
3654 const char *result_name;
3658 result_name = stop_reason_rsp + strlen ("terror:");
3659 hexstr_len = strlen (result_name) * 2;
3661 = (char *) alloca (strlen ("terror:") + hexstr_len + 1);
3662 strcpy (p, "terror:");
3664 bin2hex ((gdb_byte *) result_name, p, strlen (result_name));
3667 /* If this was a forced stop, include any stop note that was supplied. */
3668 if (strcmp (stop_reason_rsp, "tstop") == 0)
3670 stop_reason_rsp = (char *) alloca (strlen ("tstop:") + strlen (buf3) + 1);
3671 strcpy (stop_reason_rsp, "tstop:");
3672 strcat (stop_reason_rsp, buf3);
3678 "tframes:%x;tcreated:%x;"
3679 "tfree:%x;tsize:%s;"
3682 "starttime:%s;stoptime:%s;"
3683 "username:%s;notes:%s:",
3685 stop_reason_rsp, tracing_stop_tpnum,
3686 traceframe_count, traceframes_created,
3687 free_space (), phex_nz (trace_buffer_hi - trace_buffer_lo, 0),
3688 circular_trace_buffer,
3689 disconnected_tracing,
3690 phex_nz (tracing_start_time, sizeof (tracing_start_time)),
3691 phex_nz (tracing_stop_time, sizeof (tracing_stop_time)),
3696 cmd_qtp (char *own_buf)
3699 struct tracepoint *tpoint;
3700 char *packet = own_buf;
3702 packet += strlen ("qTP:");
3704 packet = unpack_varlen_hex (packet, &num);
3705 ++packet; /* skip a colon */
3706 packet = unpack_varlen_hex (packet, &addr);
3708 /* See if we already have this tracepoint. */
3709 tpoint = find_tracepoint (num, addr);
3713 trace_debug ("Tracepoint error: tracepoint %d at 0x%s not found",
3714 (int) num, paddress (addr));
3715 write_enn (own_buf);
3719 sprintf (own_buf, "V%" PRIu64 ":%" PRIu64 "", tpoint->hit_count,
3720 tpoint->traceframe_usage);
3723 /* State variables to help return all the tracepoint bits. */
3724 static struct tracepoint *cur_tpoint;
3725 static unsigned int cur_action;
3726 static unsigned int cur_step_action;
3727 static struct source_string *cur_source_string;
3728 static struct trace_state_variable *cur_tsv;
3730 /* Compose a response that is an imitation of the syntax by which the
3731 tracepoint was originally downloaded. */
3734 response_tracepoint (char *packet, struct tracepoint *tpoint)
3738 sprintf (packet, "T%x:%s:%c:%" PRIx64 ":%" PRIx64, tpoint->number,
3739 paddress (tpoint->address),
3740 (tpoint->enabled ? 'E' : 'D'), tpoint->step_count,
3741 tpoint->pass_count);
3742 if (tpoint->type == fast_tracepoint)
3743 sprintf (packet + strlen (packet), ":F%x", tpoint->orig_size);
3744 else if (tpoint->type == static_tracepoint)
3745 sprintf (packet + strlen (packet), ":S");
3749 buf = gdb_unparse_agent_expr (tpoint->cond);
3750 sprintf (packet + strlen (packet), ":X%x,%s",
3751 tpoint->cond->length, buf);
3756 /* Compose a response that is an imitation of the syntax by which the
3757 tracepoint action was originally downloaded (with the difference
3758 that due to the way we store the actions, this will output a packet
3759 per action, while GDB could have combined more than one action
3763 response_action (char *packet, struct tracepoint *tpoint,
3764 char *taction, int step)
3766 sprintf (packet, "%c%x:%s:%s",
3767 (step ? 'S' : 'A'), tpoint->number, paddress (tpoint->address),
3771 /* Compose a response that is an imitation of the syntax by which the
3772 tracepoint source piece was originally downloaded. */
3775 response_source (char *packet,
3776 struct tracepoint *tpoint, struct source_string *src)
3781 len = strlen (src->str);
3782 buf = (char *) alloca (len * 2 + 1);
3783 bin2hex ((gdb_byte *) src->str, buf, len);
3785 sprintf (packet, "Z%x:%s:%s:%x:%x:%s",
3786 tpoint->number, paddress (tpoint->address),
3787 src->type, 0, len, buf);
3790 /* Return the first piece of tracepoint definition, and initialize the
3791 state machine that will iterate through all the tracepoint
3795 cmd_qtfp (char *packet)
3797 trace_debug ("Returning first tracepoint definition piece");
3799 cur_tpoint = tracepoints;
3800 cur_action = cur_step_action = 0;
3801 cur_source_string = NULL;
3804 response_tracepoint (packet, cur_tpoint);
3806 strcpy (packet, "l");
3809 /* Return additional pieces of tracepoint definition. Each action and
3810 stepping action must go into its own packet, because of packet size
3811 limits, and so we use state variables to deliver one piece at a
3815 cmd_qtsp (char *packet)
3817 trace_debug ("Returning subsequent tracepoint definition piece");
3821 /* This case would normally never occur, but be prepared for
3823 strcpy (packet, "l");
3825 else if (cur_action < cur_tpoint->numactions)
3827 response_action (packet, cur_tpoint,
3828 cur_tpoint->actions_str[cur_action], 0);
3831 else if (cur_step_action < cur_tpoint->num_step_actions)
3833 response_action (packet, cur_tpoint,
3834 cur_tpoint->step_actions_str[cur_step_action], 1);
3837 else if ((cur_source_string
3838 ? cur_source_string->next
3839 : cur_tpoint->source_strings))
3841 if (cur_source_string)
3842 cur_source_string = cur_source_string->next;
3844 cur_source_string = cur_tpoint->source_strings;
3845 response_source (packet, cur_tpoint, cur_source_string);
3849 cur_tpoint = cur_tpoint->next;
3850 cur_action = cur_step_action = 0;
3851 cur_source_string = NULL;
3853 response_tracepoint (packet, cur_tpoint);
3855 strcpy (packet, "l");
3859 /* Compose a response that is an imitation of the syntax by which the
3860 trace state variable was originally downloaded. */
3863 response_tsv (char *packet, struct trace_state_variable *tsv)
3865 char *buf = (char *) "";
3870 namelen = strlen (tsv->name);
3871 buf = (char *) alloca (namelen * 2 + 1);
3872 bin2hex ((gdb_byte *) tsv->name, buf, namelen);
3875 sprintf (packet, "%x:%s:%x:%s", tsv->number, phex_nz (tsv->initial_value, 0),
3876 tsv->getter ? 1 : 0, buf);
3879 /* Return the first trace state variable definition, and initialize
3880 the state machine that will iterate through all the tsv bits. */
3883 cmd_qtfv (char *packet)
3885 trace_debug ("Returning first trace state variable definition");
3887 cur_tsv = trace_state_variables;
3890 response_tsv (packet, cur_tsv);
3892 strcpy (packet, "l");
3895 /* Return additional trace state variable definitions. */
3898 cmd_qtsv (char *packet)
3900 trace_debug ("Returning additional trace state variable definition");
3904 cur_tsv = cur_tsv->next;
3906 response_tsv (packet, cur_tsv);
3908 strcpy (packet, "l");
3911 strcpy (packet, "l");
3914 /* Return the first static tracepoint marker, and initialize the state
3915 machine that will iterate through all the static tracepoints
3919 cmd_qtfstm (char *packet)
3921 if (!maybe_write_ipa_ust_not_loaded (packet))
3922 run_inferior_command (packet, strlen (packet) + 1);
3925 /* Return additional static tracepoints markers. */
3928 cmd_qtsstm (char *packet)
3930 if (!maybe_write_ipa_ust_not_loaded (packet))
3931 run_inferior_command (packet, strlen (packet) + 1);
3934 /* Return the definition of the static tracepoint at a given address.
3935 Result packet is the same as qTsST's. */
3938 cmd_qtstmat (char *packet)
3940 if (!maybe_write_ipa_ust_not_loaded (packet))
3941 run_inferior_command (packet, strlen (packet) + 1);
3944 /* Helper for gdb_agent_about_to_close.
3945 Return non-zero if thread ENTRY is in the same process in DATA. */
3948 same_process_p (struct inferior_list_entry *entry, void *data)
3950 int *pid = (int *) data;
3952 return ptid_get_pid (entry->id) == *pid;
3955 /* Sent the agent a command to close it. */
3958 gdb_agent_about_to_close (int pid)
3960 char buf[IPA_CMD_BUF_SIZE];
3962 if (!maybe_write_ipa_not_loaded (buf))
3964 struct thread_info *saved_thread;
3966 saved_thread = current_thread;
3968 /* Find any thread which belongs to process PID. */
3969 current_thread = (struct thread_info *)
3970 find_inferior (&all_threads, same_process_p, &pid);
3972 strcpy (buf, "close");
3974 run_inferior_command (buf, strlen (buf) + 1);
3976 current_thread = saved_thread;
3980 /* Return the minimum instruction size needed for fast tracepoints as a
3981 hexadecimal number. */
3984 cmd_qtminftpilen (char *packet)
3986 if (current_thread == NULL)
3988 /* Indicate that the minimum length is currently unknown. */
3989 strcpy (packet, "0");
3993 sprintf (packet, "%x", target_get_min_fast_tracepoint_insn_len ());
3996 /* Respond to qTBuffer packet with a block of raw data from the trace
3997 buffer. GDB may ask for a lot, but we are allowed to reply with
3998 only as much as will fit within packet limits or whatever. */
4001 cmd_qtbuffer (char *own_buf)
4003 ULONGEST offset, num, tot;
4005 char *packet = own_buf;
4007 packet += strlen ("qTBuffer:");
4009 packet = unpack_varlen_hex (packet, &offset);
4010 ++packet; /* skip a comma */
4011 unpack_varlen_hex (packet, &num);
4013 trace_debug ("Want to get trace buffer, %d bytes at offset 0x%s",
4014 (int) num, phex_nz (offset, 0));
4016 tot = (trace_buffer_hi - trace_buffer_lo) - free_space ();
4018 /* If we're right at the end, reply specially that we're done. */
4021 strcpy (own_buf, "l");
4025 /* Object to any other out-of-bounds request. */
4028 write_enn (own_buf);
4032 /* Compute the pointer corresponding to the given offset, accounting
4034 tbp = trace_buffer_start + offset;
4035 if (tbp >= trace_buffer_wrap)
4036 tbp -= (trace_buffer_wrap - trace_buffer_lo);
4038 /* Trim to the remaining bytes if we're close to the end. */
4039 if (num > tot - offset)
4042 /* Trim to available packet size. */
4043 if (num >= (PBUFSIZ - 16) / 2 )
4044 num = (PBUFSIZ - 16) / 2;
4046 bin2hex (tbp, own_buf, num);
4050 cmd_bigqtbuffer_circular (char *own_buf)
4053 char *packet = own_buf;
4055 packet += strlen ("QTBuffer:circular:");
4057 unpack_varlen_hex (packet, &val);
4058 circular_trace_buffer = val;
4059 trace_debug ("Trace buffer is now %s",
4060 circular_trace_buffer ? "circular" : "linear");
4065 cmd_bigqtbuffer_size (char *own_buf)
4069 char *packet = own_buf;
4071 /* Can't change the size during a tracing run. */
4074 write_enn (own_buf);
4078 packet += strlen ("QTBuffer:size:");
4080 /* -1 is sent as literal "-1". */
4081 if (strcmp (packet, "-1") == 0)
4082 sval = DEFAULT_TRACE_BUFFER_SIZE;
4085 unpack_varlen_hex (packet, &val);
4086 sval = (LONGEST) val;
4089 init_trace_buffer (sval);
4090 trace_debug ("Trace buffer is now %s bytes",
4091 plongest (trace_buffer_size));
4096 cmd_qtnotes (char *own_buf)
4099 char *saved, *user, *notes, *stopnote;
4100 char *packet = own_buf;
4102 packet += strlen ("QTNotes:");
4106 if (startswith (packet, "user:"))
4108 packet += strlen ("user:");
4110 packet = strchr (packet, ';');
4111 nbytes = (packet - saved) / 2;
4112 user = (char *) xmalloc (nbytes + 1);
4113 nbytes = hex2bin (saved, (gdb_byte *) user, nbytes);
4114 user[nbytes] = '\0';
4115 ++packet; /* skip the semicolon */
4116 trace_debug ("User is '%s'", user);
4117 xfree (tracing_user_name);
4118 tracing_user_name = user;
4120 else if (startswith (packet, "notes:"))
4122 packet += strlen ("notes:");
4124 packet = strchr (packet, ';');
4125 nbytes = (packet - saved) / 2;
4126 notes = (char *) xmalloc (nbytes + 1);
4127 nbytes = hex2bin (saved, (gdb_byte *) notes, nbytes);
4128 notes[nbytes] = '\0';
4129 ++packet; /* skip the semicolon */
4130 trace_debug ("Notes is '%s'", notes);
4131 xfree (tracing_notes);
4132 tracing_notes = notes;
4134 else if (startswith (packet, "tstop:"))
4136 packet += strlen ("tstop:");
4138 packet = strchr (packet, ';');
4139 nbytes = (packet - saved) / 2;
4140 stopnote = (char *) xmalloc (nbytes + 1);
4141 nbytes = hex2bin (saved, (gdb_byte *) stopnote, nbytes);
4142 stopnote[nbytes] = '\0';
4143 ++packet; /* skip the semicolon */
4144 trace_debug ("tstop note is '%s'", stopnote);
4145 xfree (tracing_stop_note);
4146 tracing_stop_note = stopnote;
4156 handle_tracepoint_general_set (char *packet)
4158 if (strcmp ("QTinit", packet) == 0)
4160 cmd_qtinit (packet);
4163 else if (startswith (packet, "QTDP:"))
4168 else if (startswith (packet, "QTDPsrc:"))
4170 cmd_qtdpsrc (packet);
4173 else if (startswith (packet, "QTEnable:"))
4175 cmd_qtenable_disable (packet, 1);
4178 else if (startswith (packet, "QTDisable:"))
4180 cmd_qtenable_disable (packet, 0);
4183 else if (startswith (packet, "QTDV:"))
4188 else if (startswith (packet, "QTro:"))
4193 else if (strcmp ("QTStart", packet) == 0)
4195 cmd_qtstart (packet);
4198 else if (strcmp ("QTStop", packet) == 0)
4200 cmd_qtstop (packet);
4203 else if (startswith (packet, "QTDisconnected:"))
4205 cmd_qtdisconnected (packet);
4208 else if (startswith (packet, "QTFrame:"))
4210 cmd_qtframe (packet);
4213 else if (startswith (packet, "QTBuffer:circular:"))
4215 cmd_bigqtbuffer_circular (packet);
4218 else if (startswith (packet, "QTBuffer:size:"))
4220 cmd_bigqtbuffer_size (packet);
4223 else if (startswith (packet, "QTNotes:"))
4225 cmd_qtnotes (packet);
4233 handle_tracepoint_query (char *packet)
4235 if (strcmp ("qTStatus", packet) == 0)
4237 cmd_qtstatus (packet);
4240 else if (startswith (packet, "qTP:"))
4245 else if (strcmp ("qTfP", packet) == 0)
4250 else if (strcmp ("qTsP", packet) == 0)
4255 else if (strcmp ("qTfV", packet) == 0)
4260 else if (strcmp ("qTsV", packet) == 0)
4265 else if (startswith (packet, "qTV:"))
4270 else if (startswith (packet, "qTBuffer:"))
4272 cmd_qtbuffer (packet);
4275 else if (strcmp ("qTfSTM", packet) == 0)
4277 cmd_qtfstm (packet);
4280 else if (strcmp ("qTsSTM", packet) == 0)
4282 cmd_qtsstm (packet);
4285 else if (startswith (packet, "qTSTMat:"))
4287 cmd_qtstmat (packet);
4290 else if (strcmp ("qTMinFTPILen", packet) == 0)
4292 cmd_qtminftpilen (packet);
4300 #ifndef IN_PROCESS_AGENT
4302 /* Call this when thread TINFO has hit the tracepoint defined by
4303 TP_NUMBER and TP_ADDRESS, and that tracepoint has a while-stepping
4304 action. This adds a while-stepping collecting state item to the
4305 threads' collecting state list, so that we can keep track of
4306 multiple simultaneous while-stepping actions being collected by the
4307 same thread. This can happen in cases like:
4309 ff0001 INSN1 <-- TP1, while-stepping 10 collect $regs
4311 ff0003 INSN3 <-- TP2, collect $regs
4312 ff0004 INSN4 <-- TP3, while-stepping 10 collect $regs
4315 Notice that when instruction INSN5 is reached, the while-stepping
4316 actions of both TP1 and TP3 are still being collected, and that TP2
4317 had been collected meanwhile. The whole range of ff0001-ff0005
4318 should be single-stepped, due to at least TP1's while-stepping
4319 action covering the whole range. */
4322 add_while_stepping_state (struct thread_info *tinfo,
4323 int tp_number, CORE_ADDR tp_address)
4325 struct wstep_state *wstep = XNEW (struct wstep_state);
4327 wstep->next = tinfo->while_stepping;
4329 wstep->tp_number = tp_number;
4330 wstep->tp_address = tp_address;
4331 wstep->current_step = 0;
4333 tinfo->while_stepping = wstep;
4336 /* Release the while-stepping collecting state WSTEP. */
4339 release_while_stepping_state (struct wstep_state *wstep)
4344 /* Release all while-stepping collecting states currently associated
4345 with thread TINFO. */
4348 release_while_stepping_state_list (struct thread_info *tinfo)
4350 struct wstep_state *head;
4352 while (tinfo->while_stepping)
4354 head = tinfo->while_stepping;
4355 tinfo->while_stepping = head->next;
4356 release_while_stepping_state (head);
4360 /* If TINFO was handling a 'while-stepping' action, the step has
4361 finished, so collect any step data needed, and check if any more
4362 steps are required. Return true if the thread was indeed
4363 collecting tracepoint data, false otherwise. */
4366 tracepoint_finished_step (struct thread_info *tinfo, CORE_ADDR stop_pc)
4368 struct tracepoint *tpoint;
4369 struct wstep_state *wstep;
4370 struct wstep_state **wstep_link;
4371 struct trap_tracepoint_ctx ctx;
4373 /* Pull in fast tracepoint trace frames from the inferior lib buffer into
4375 if (agent_loaded_p ())
4376 upload_fast_traceframes ();
4378 /* Check if we were indeed collecting data for one of more
4379 tracepoints with a 'while-stepping' count. */
4380 if (tinfo->while_stepping == NULL)
4385 /* We're not even tracing anymore. Stop this thread from
4387 release_while_stepping_state_list (tinfo);
4389 /* The thread had stopped due to a single-step request indeed
4390 explained by a tracepoint. */
4394 wstep = tinfo->while_stepping;
4395 wstep_link = &tinfo->while_stepping;
4397 trace_debug ("Thread %s finished a single-step for tracepoint %d at 0x%s",
4398 target_pid_to_str (tinfo->entry.id),
4399 wstep->tp_number, paddress (wstep->tp_address));
4401 ctx.base.type = trap_tracepoint;
4402 ctx.regcache = get_thread_regcache (tinfo, 1);
4404 while (wstep != NULL)
4406 tpoint = find_tracepoint (wstep->tp_number, wstep->tp_address);
4409 trace_debug ("NO TRACEPOINT %d at 0x%s FOR THREAD %s!",
4410 wstep->tp_number, paddress (wstep->tp_address),
4411 target_pid_to_str (tinfo->entry.id));
4414 *wstep_link = wstep->next;
4415 release_while_stepping_state (wstep);
4416 wstep = *wstep_link;
4420 /* We've just finished one step. */
4421 ++wstep->current_step;
4424 collect_data_at_step ((struct tracepoint_hit_ctx *) &ctx,
4425 stop_pc, tpoint, wstep->current_step);
4427 if (wstep->current_step >= tpoint->step_count)
4429 /* The requested numbers of steps have occurred. */
4430 trace_debug ("Thread %s done stepping for tracepoint %d at 0x%s",
4431 target_pid_to_str (tinfo->entry.id),
4432 wstep->tp_number, paddress (wstep->tp_address));
4434 /* Unlink the wstep. */
4435 *wstep_link = wstep->next;
4436 release_while_stepping_state (wstep);
4437 wstep = *wstep_link;
4439 /* Only check the hit count now, which ensure that we do all
4440 our stepping before stopping the run. */
4441 if (tpoint->pass_count > 0
4442 && tpoint->hit_count >= tpoint->pass_count
4443 && stopping_tracepoint == NULL)
4444 stopping_tracepoint = tpoint;
4448 /* Keep single-stepping until the requested numbers of steps
4450 wstep_link = &wstep->next;
4451 wstep = *wstep_link;
4454 if (stopping_tracepoint
4455 || trace_buffer_is_full
4456 || expr_eval_result != expr_eval_no_error)
4466 /* Handle any internal tracing control breakpoint hits. That means,
4467 pull traceframes from the IPA to our buffer, and syncing both
4468 tracing agents when the IPA's tracing stops for some reason. */
4471 handle_tracepoint_bkpts (struct thread_info *tinfo, CORE_ADDR stop_pc)
4473 /* Pull in fast tracepoint trace frames from the inferior in-process
4474 agent's buffer into our buffer. */
4476 if (!agent_loaded_p ())
4479 upload_fast_traceframes ();
4481 /* Check if the in-process agent had decided we should stop
4483 if (stop_pc == ipa_sym_addrs.addr_stop_tracing)
4485 int ipa_trace_buffer_is_full;
4486 CORE_ADDR ipa_stopping_tracepoint;
4487 int ipa_expr_eval_result;
4488 CORE_ADDR ipa_error_tracepoint;
4490 trace_debug ("lib stopped at stop_tracing");
4492 read_inferior_integer (ipa_sym_addrs.addr_trace_buffer_is_full,
4493 &ipa_trace_buffer_is_full);
4495 read_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint,
4496 &ipa_stopping_tracepoint);
4497 write_inferior_data_pointer (ipa_sym_addrs.addr_stopping_tracepoint, 0);
4499 read_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint,
4500 &ipa_error_tracepoint);
4501 write_inferior_data_pointer (ipa_sym_addrs.addr_error_tracepoint, 0);
4503 read_inferior_integer (ipa_sym_addrs.addr_expr_eval_result,
4504 &ipa_expr_eval_result);
4505 write_inferior_integer (ipa_sym_addrs.addr_expr_eval_result, 0);
4507 trace_debug ("lib: trace_buffer_is_full: %d, "
4508 "stopping_tracepoint: %s, "
4509 "ipa_expr_eval_result: %d, "
4510 "error_tracepoint: %s, ",
4511 ipa_trace_buffer_is_full,
4512 paddress (ipa_stopping_tracepoint),
4513 ipa_expr_eval_result,
4514 paddress (ipa_error_tracepoint));
4518 if (ipa_trace_buffer_is_full)
4519 trace_debug ("lib stopped due to full buffer.");
4520 if (ipa_stopping_tracepoint)
4521 trace_debug ("lib stopped due to tpoint");
4522 if (ipa_stopping_tracepoint)
4523 trace_debug ("lib stopped due to error");
4526 if (ipa_stopping_tracepoint != 0)
4529 = fast_tracepoint_from_ipa_tpoint_address (ipa_stopping_tracepoint);
4531 else if (ipa_expr_eval_result != expr_eval_no_error)
4533 expr_eval_result = ipa_expr_eval_result;
4535 = fast_tracepoint_from_ipa_tpoint_address (ipa_error_tracepoint);
4540 else if (stop_pc == ipa_sym_addrs.addr_flush_trace_buffer)
4542 trace_debug ("lib stopped at flush_trace_buffer");
4549 /* Return true if TINFO just hit a tracepoint. Collect data if
4553 tracepoint_was_hit (struct thread_info *tinfo, CORE_ADDR stop_pc)
4555 struct tracepoint *tpoint;
4557 struct trap_tracepoint_ctx ctx;
4559 /* Not tracing, don't handle. */
4563 ctx.base.type = trap_tracepoint;
4564 ctx.regcache = get_thread_regcache (tinfo, 1);
4566 for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
4568 /* Note that we collect fast tracepoints here as well. We'll
4569 step over the fast tracepoint jump later, which avoids the
4570 double collect. However, we don't collect for static
4571 tracepoints here, because UST markers are compiled in program,
4572 and probes will be executed in program. So static tracepoints
4573 are collected there. */
4574 if (tpoint->enabled && stop_pc == tpoint->address
4575 && tpoint->type != static_tracepoint)
4577 trace_debug ("Thread %s at address of tracepoint %d at 0x%s",
4578 target_pid_to_str (tinfo->entry.id),
4579 tpoint->number, paddress (tpoint->address));
4581 /* Test the condition if present, and collect if true. */
4583 || (condition_true_at_tracepoint
4584 ((struct tracepoint_hit_ctx *) &ctx, tpoint)))
4585 collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx,
4588 if (stopping_tracepoint
4589 || trace_buffer_is_full
4590 || expr_eval_result != expr_eval_no_error)
4594 /* If the tracepoint had a 'while-stepping' action, then set
4595 the thread to collect this tracepoint on the following
4597 else if (tpoint->step_count > 0)
4599 add_while_stepping_state (tinfo,
4600 tpoint->number, tpoint->address);
4612 #if defined IN_PROCESS_AGENT && defined HAVE_UST
4613 struct ust_marker_data;
4614 static void collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx,
4615 struct traceframe *tframe);
4618 /* Create a trace frame for the hit of the given tracepoint in the
4622 collect_data_at_tracepoint (struct tracepoint_hit_ctx *ctx, CORE_ADDR stop_pc,
4623 struct tracepoint *tpoint)
4625 struct traceframe *tframe;
4628 /* Only count it as a hit when we actually collect data. */
4629 tpoint->hit_count++;
4631 /* If we've exceeded a defined pass count, record the event for
4632 later, and finish the collection for this hit. This test is only
4633 for nonstepping tracepoints, stepping tracepoints test at the end
4634 of their while-stepping loop. */
4635 if (tpoint->pass_count > 0
4636 && tpoint->hit_count >= tpoint->pass_count
4637 && tpoint->step_count == 0
4638 && stopping_tracepoint == NULL)
4639 stopping_tracepoint = tpoint;
4641 trace_debug ("Making new traceframe for tracepoint %d at 0x%s, hit %" PRIu64,
4642 tpoint->number, paddress (tpoint->address), tpoint->hit_count);
4644 tframe = add_traceframe (tpoint);
4648 for (acti = 0; acti < tpoint->numactions; ++acti)
4650 #ifndef IN_PROCESS_AGENT
4651 trace_debug ("Tracepoint %d at 0x%s about to do action '%s'",
4652 tpoint->number, paddress (tpoint->address),
4653 tpoint->actions_str[acti]);
4656 do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe,
4657 tpoint->actions[acti]);
4660 finish_traceframe (tframe);
4663 if (tframe == NULL && tracing)
4664 trace_buffer_is_full = 1;
4667 #ifndef IN_PROCESS_AGENT
4670 collect_data_at_step (struct tracepoint_hit_ctx *ctx,
4672 struct tracepoint *tpoint, int current_step)
4674 struct traceframe *tframe;
4677 trace_debug ("Making new step traceframe for "
4678 "tracepoint %d at 0x%s, step %d of %" PRIu64 ", hit %" PRIu64,
4679 tpoint->number, paddress (tpoint->address),
4680 current_step, tpoint->step_count,
4683 tframe = add_traceframe (tpoint);
4687 for (acti = 0; acti < tpoint->num_step_actions; ++acti)
4689 trace_debug ("Tracepoint %d at 0x%s about to do step action '%s'",
4690 tpoint->number, paddress (tpoint->address),
4691 tpoint->step_actions_str[acti]);
4693 do_action_at_tracepoint (ctx, stop_pc, tpoint, tframe,
4694 tpoint->step_actions[acti]);
4697 finish_traceframe (tframe);
4700 if (tframe == NULL && tracing)
4701 trace_buffer_is_full = 1;
4706 #ifdef IN_PROCESS_AGENT
4707 /* The target description used by the IPA. Given that the IPA library
4708 is built for a specific architecture that is loaded into the
4709 inferior, there only needs to be one such description per
4711 const struct target_desc *ipa_tdesc;
4714 static struct regcache *
4715 get_context_regcache (struct tracepoint_hit_ctx *ctx)
4717 struct regcache *regcache = NULL;
4719 #ifdef IN_PROCESS_AGENT
4720 if (ctx->type == fast_tracepoint)
4722 struct fast_tracepoint_ctx *fctx = (struct fast_tracepoint_ctx *) ctx;
4723 if (!fctx->regcache_initted)
4725 fctx->regcache_initted = 1;
4726 init_register_cache (&fctx->regcache, ipa_tdesc, fctx->regspace);
4727 supply_regblock (&fctx->regcache, NULL);
4728 supply_fast_tracepoint_registers (&fctx->regcache, fctx->regs);
4730 regcache = &fctx->regcache;
4733 if (ctx->type == static_tracepoint)
4735 struct static_tracepoint_ctx *sctx
4736 = (struct static_tracepoint_ctx *) ctx;
4738 if (!sctx->regcache_initted)
4740 sctx->regcache_initted = 1;
4741 init_register_cache (&sctx->regcache, ipa_tdesc, sctx->regspace);
4742 supply_regblock (&sctx->regcache, NULL);
4743 /* Pass down the tracepoint address, because REGS doesn't
4744 include the PC, but we know what it must have been. */
4745 supply_static_tracepoint_registers (&sctx->regcache,
4746 (const unsigned char *)
4748 sctx->tpoint->address);
4750 regcache = &sctx->regcache;
4754 if (ctx->type == trap_tracepoint)
4756 struct trap_tracepoint_ctx *tctx = (struct trap_tracepoint_ctx *) ctx;
4757 regcache = tctx->regcache;
4761 gdb_assert (regcache != NULL);
4767 do_action_at_tracepoint (struct tracepoint_hit_ctx *ctx,
4769 struct tracepoint *tpoint,
4770 struct traceframe *tframe,
4771 struct tracepoint_action *taction)
4773 enum eval_result_type err;
4775 switch (taction->type)
4779 struct collect_memory_action *maction;
4780 struct eval_agent_expr_context ax_ctx;
4782 maction = (struct collect_memory_action *) taction;
4783 ax_ctx.regcache = NULL;
4784 ax_ctx.tframe = tframe;
4785 ax_ctx.tpoint = tpoint;
4787 trace_debug ("Want to collect %s bytes at 0x%s (basereg %d)",
4788 pulongest (maction->len),
4789 paddress (maction->addr), maction->basereg);
4790 /* (should use basereg) */
4791 agent_mem_read (&ax_ctx, NULL, (CORE_ADDR) maction->addr,
4797 unsigned char *regspace;
4798 struct regcache tregcache;
4799 struct regcache *context_regcache;
4802 trace_debug ("Want to collect registers");
4804 context_regcache = get_context_regcache (ctx);
4805 regcache_size = register_cache_size (context_regcache->tdesc);
4807 /* Collect all registers for now. */
4808 regspace = add_traceframe_block (tframe, tpoint, 1 + regcache_size);
4809 if (regspace == NULL)
4811 trace_debug ("Trace buffer block allocation failed, skipping");
4814 /* Identify a register block. */
4817 /* Wrap the regblock in a register cache (in the stack, we
4818 don't want to malloc here). */
4819 init_register_cache (&tregcache, context_regcache->tdesc,
4822 /* Copy the register data to the regblock. */
4823 regcache_cpy (&tregcache, context_regcache);
4825 #ifndef IN_PROCESS_AGENT
4826 /* On some platforms, trap-based tracepoints will have the PC
4827 pointing to the next instruction after the trap, but we
4828 don't want the user or GDB trying to guess whether the
4829 saved PC needs adjusting; so always record the adjusted
4830 stop_pc. Note that we can't use tpoint->address instead,
4831 since it will be wrong for while-stepping actions. This
4832 adjustment is a nop for fast tracepoints collected from the
4833 in-process lib (but not if GDBserver is collecting one
4834 preemptively), since the PC had already been adjusted to
4835 contain the tracepoint's address by the jump pad. */
4836 trace_debug ("Storing stop pc (0x%s) in regblock",
4837 paddress (stop_pc));
4839 /* This changes the regblock, not the thread's
4841 regcache_write_pc (&tregcache, stop_pc);
4847 struct eval_expr_action *eaction;
4848 struct eval_agent_expr_context ax_ctx;
4850 eaction = (struct eval_expr_action *) taction;
4851 ax_ctx.regcache = get_context_regcache (ctx);
4852 ax_ctx.tframe = tframe;
4853 ax_ctx.tpoint = tpoint;
4855 trace_debug ("Want to evaluate expression");
4857 err = gdb_eval_agent_expr (&ax_ctx, eaction->expr, NULL);
4859 if (err != expr_eval_no_error)
4861 record_tracepoint_error (tpoint, "action expression", err);
4868 #if defined IN_PROCESS_AGENT && defined HAVE_UST
4869 trace_debug ("Want to collect static trace data");
4870 collect_ust_data_at_tracepoint (ctx, tframe);
4872 trace_debug ("warning: collecting static trace data, "
4873 "but static tracepoints are not supported");
4878 trace_debug ("unknown trace action '%c', ignoring", taction->type);
4884 condition_true_at_tracepoint (struct tracepoint_hit_ctx *ctx,
4885 struct tracepoint *tpoint)
4888 enum eval_result_type err;
4890 /* Presently, gdbserver doesn't run compiled conditions, only the
4891 IPA does. If the program stops at a fast tracepoint's address
4892 (e.g., due to a breakpoint, trap tracepoint, or stepping),
4893 gdbserver preemptively collect the fast tracepoint. Later, on
4894 resume, gdbserver steps over the fast tracepoint like it steps
4895 over breakpoints, so that the IPA doesn't see that fast
4896 tracepoint. This avoids double collects of fast tracepoints in
4897 that stopping scenario. Having gdbserver itself handle the fast
4898 tracepoint gives the user a consistent view of when fast or trap
4899 tracepoints are collected, compared to an alternative where only
4900 trap tracepoints are collected on stop, and fast tracepoints on
4901 resume. When a fast tracepoint is being processed by gdbserver,
4902 it is always the non-compiled condition expression that is
4904 #ifdef IN_PROCESS_AGENT
4905 if (tpoint->compiled_cond)
4907 struct fast_tracepoint_ctx *fctx = (struct fast_tracepoint_ctx *) ctx;
4908 err = ((condfn) (uintptr_t) (tpoint->compiled_cond)) (fctx->regs, &value);
4913 struct eval_agent_expr_context ax_ctx;
4915 ax_ctx.regcache = get_context_regcache (ctx);
4916 ax_ctx.tframe = NULL;
4917 ax_ctx.tpoint = tpoint;
4919 err = gdb_eval_agent_expr (&ax_ctx, tpoint->cond, &value);
4921 if (err != expr_eval_no_error)
4923 record_tracepoint_error (tpoint, "condition", err);
4924 /* The error case must return false. */
4928 trace_debug ("Tracepoint %d at 0x%s condition evals to %s",
4929 tpoint->number, paddress (tpoint->address),
4931 return (value ? 1 : 0);
4934 /* Do memory copies for bytecodes. */
4935 /* Do the recording of memory blocks for actions and bytecodes. */
4938 agent_mem_read (struct eval_agent_expr_context *ctx,
4939 unsigned char *to, CORE_ADDR from, ULONGEST len)
4941 unsigned char *mspace;
4942 ULONGEST remaining = len;
4943 unsigned short blocklen;
4945 /* If a 'to' buffer is specified, use it. */
4948 read_inferior_memory (from, to, len);
4952 /* Otherwise, create a new memory block in the trace buffer. */
4953 while (remaining > 0)
4957 blocklen = (remaining > 65535 ? 65535 : remaining);
4958 sp = 1 + sizeof (from) + sizeof (blocklen) + blocklen;
4959 mspace = add_traceframe_block (ctx->tframe, ctx->tpoint, sp);
4962 /* Identify block as a memory block. */
4965 /* Record address and size. */
4966 memcpy (mspace, &from, sizeof (from));
4967 mspace += sizeof (from);
4968 memcpy (mspace, &blocklen, sizeof (blocklen));
4969 mspace += sizeof (blocklen);
4970 /* Record the memory block proper. */
4971 read_inferior_memory (from, mspace, blocklen);
4972 trace_debug ("%d bytes recorded", blocklen);
4973 remaining -= blocklen;
4980 agent_mem_read_string (struct eval_agent_expr_context *ctx,
4981 unsigned char *to, CORE_ADDR from, ULONGEST len)
4983 unsigned char *buf, *mspace;
4984 ULONGEST remaining = len;
4985 unsigned short blocklen, i;
4987 /* To save a bit of space, block lengths are 16-bit, so break large
4988 requests into multiple blocks. Bordering on overkill for strings,
4989 but it could happen that someone specifies a large max length. */
4990 while (remaining > 0)
4994 blocklen = (remaining > 65535 ? 65535 : remaining);
4995 /* We want working space to accumulate nonzero bytes, since
4996 traceframes must have a predecided size (otherwise it gets
4997 harder to wrap correctly for the circular case, etc). */
4998 buf = (unsigned char *) xmalloc (blocklen + 1);
4999 for (i = 0; i < blocklen; ++i)
5001 /* Read the string one byte at a time, in case the string is
5002 at the end of a valid memory area - we don't want a
5003 correctly-terminated string to engender segvio
5005 read_inferior_memory (from + i, buf + i, 1);
5010 /* Make sure outer loop stops now too. */
5011 remaining = blocklen;
5015 sp = 1 + sizeof (from) + sizeof (blocklen) + blocklen;
5016 mspace = add_traceframe_block (ctx->tframe, ctx->tpoint, sp);
5022 /* Identify block as a memory block. */
5025 /* Record address and size. */
5026 memcpy ((void *) mspace, (void *) &from, sizeof (from));
5027 mspace += sizeof (from);
5028 memcpy ((void *) mspace, (void *) &blocklen, sizeof (blocklen));
5029 mspace += sizeof (blocklen);
5030 /* Copy the string contents. */
5031 memcpy ((void *) mspace, (void *) buf, blocklen);
5032 remaining -= blocklen;
5039 /* Record the value of a trace state variable. */
5042 agent_tsv_read (struct eval_agent_expr_context *ctx, int n)
5044 unsigned char *vspace;
5047 vspace = add_traceframe_block (ctx->tframe, ctx->tpoint,
5048 1 + sizeof (n) + sizeof (LONGEST));
5051 /* Identify block as a variable. */
5053 /* Record variable's number and value. */
5054 memcpy (vspace + 1, &n, sizeof (n));
5055 val = get_trace_state_variable_value (n);
5056 memcpy (vspace + 1 + sizeof (n), &val, sizeof (val));
5057 trace_debug ("Variable %d recorded", n);
5061 #ifndef IN_PROCESS_AGENT
5063 /* Callback for traceframe_walk_blocks, used to find a given block
5064 type in a traceframe. */
5067 match_blocktype (char blocktype, unsigned char *dataptr, void *data)
5069 char *wantedp = (char *) data;
5071 if (*wantedp == blocktype)
5077 /* Walk over all traceframe blocks of the traceframe buffer starting
5078 at DATABASE, of DATASIZE bytes long, and call CALLBACK for each
5079 block found, passing in DATA unmodified. If CALLBACK returns true,
5080 this returns a pointer to where the block is found. Returns NULL
5081 if no callback call returned true, indicating that all blocks have
5084 static unsigned char *
5085 traceframe_walk_blocks (unsigned char *database, unsigned int datasize,
5087 int (*callback) (char blocktype,
5088 unsigned char *dataptr,
5092 unsigned char *dataptr;
5096 trace_debug ("traceframe %d has no data", tfnum);
5100 /* Iterate through a traceframe's blocks, looking for a block of the
5102 for (dataptr = database;
5103 dataptr < database + datasize;
5107 unsigned short mlen;
5109 if (dataptr == trace_buffer_wrap)
5111 /* Adjust to reflect wrapping part of the frame around to
5113 datasize = dataptr - database;
5114 dataptr = database = trace_buffer_lo;
5117 blocktype = *dataptr++;
5119 if ((*callback) (blocktype, dataptr, data))
5125 /* Skip over the registers block. */
5126 dataptr += current_target_desc ()->registers_size;
5129 /* Skip over the memory block. */
5130 dataptr += sizeof (CORE_ADDR);
5131 memcpy (&mlen, dataptr, sizeof (mlen));
5132 dataptr += (sizeof (mlen) + mlen);
5135 /* Skip over the TSV block. */
5136 dataptr += (sizeof (int) + sizeof (LONGEST));
5139 /* Skip over the static trace data block. */
5140 memcpy (&mlen, dataptr, sizeof (mlen));
5141 dataptr += (sizeof (mlen) + mlen);
5144 trace_debug ("traceframe %d has unknown block type 0x%x",
5153 /* Look for the block of type TYPE_WANTED in the trameframe starting
5154 at DATABASE of DATASIZE bytes long. TFNUM is the traceframe
5157 static unsigned char *
5158 traceframe_find_block_type (unsigned char *database, unsigned int datasize,
5159 int tfnum, char type_wanted)
5161 return traceframe_walk_blocks (database, datasize, tfnum,
5162 match_blocktype, &type_wanted);
5165 static unsigned char *
5166 traceframe_find_regblock (struct traceframe *tframe, int tfnum)
5168 unsigned char *regblock;
5170 regblock = traceframe_find_block_type (tframe->data,
5174 if (regblock == NULL)
5175 trace_debug ("traceframe %d has no register data", tfnum);
5180 /* Get registers from a traceframe. */
5183 fetch_traceframe_registers (int tfnum, struct regcache *regcache, int regnum)
5185 unsigned char *dataptr;
5186 struct tracepoint *tpoint;
5187 struct traceframe *tframe;
5189 tframe = find_traceframe (tfnum);
5193 trace_debug ("traceframe %d not found", tfnum);
5197 dataptr = traceframe_find_regblock (tframe, tfnum);
5198 if (dataptr == NULL)
5200 /* Mark registers unavailable. */
5201 supply_regblock (regcache, NULL);
5203 /* We can generally guess at a PC, although this will be
5204 misleading for while-stepping frames and multi-location
5206 tpoint = find_next_tracepoint_by_number (NULL, tframe->tpnum);
5208 regcache_write_pc (regcache, tpoint->address);
5211 supply_regblock (regcache, dataptr);
5217 traceframe_get_pc (struct traceframe *tframe)
5219 struct regcache regcache;
5220 unsigned char *dataptr;
5221 const struct target_desc *tdesc = current_target_desc ();
5223 dataptr = traceframe_find_regblock (tframe, -1);
5224 if (dataptr == NULL)
5227 init_register_cache (®cache, tdesc, dataptr);
5228 return regcache_read_pc (®cache);
5231 /* Read a requested block of memory from a trace frame. */
5234 traceframe_read_mem (int tfnum, CORE_ADDR addr,
5235 unsigned char *buf, ULONGEST length,
5238 struct traceframe *tframe;
5239 unsigned char *database, *dataptr;
5240 unsigned int datasize;
5242 unsigned short mlen;
5244 trace_debug ("traceframe_read_mem");
5246 tframe = find_traceframe (tfnum);
5250 trace_debug ("traceframe %d not found", tfnum);
5254 datasize = tframe->data_size;
5255 database = dataptr = &tframe->data[0];
5257 /* Iterate through a traceframe's blocks, looking for memory. */
5258 while ((dataptr = traceframe_find_block_type (dataptr,
5260 - (dataptr - database),
5261 tfnum, 'M')) != NULL)
5263 memcpy (&maddr, dataptr, sizeof (maddr));
5264 dataptr += sizeof (maddr);
5265 memcpy (&mlen, dataptr, sizeof (mlen));
5266 dataptr += sizeof (mlen);
5267 trace_debug ("traceframe %d has %d bytes at %s",
5268 tfnum, mlen, paddress (maddr));
5270 /* If the block includes the first part of the desired range,
5271 return as much it has; GDB will re-request the remainder,
5272 which might be in a different block of this trace frame. */
5273 if (maddr <= addr && addr < (maddr + mlen))
5275 ULONGEST amt = (maddr + mlen) - addr;
5279 memcpy (buf, dataptr + (addr - maddr), amt);
5284 /* Skip over this block. */
5288 trace_debug ("traceframe %d has no memory data for the desired region",
5296 traceframe_read_tsv (int tsvnum, LONGEST *val)
5299 struct traceframe *tframe;
5300 unsigned char *database, *dataptr;
5301 unsigned int datasize;
5305 trace_debug ("traceframe_read_tsv");
5307 tfnum = current_traceframe;
5311 trace_debug ("no current traceframe");
5315 tframe = find_traceframe (tfnum);
5319 trace_debug ("traceframe %d not found", tfnum);
5323 datasize = tframe->data_size;
5324 database = dataptr = &tframe->data[0];
5326 /* Iterate through a traceframe's blocks, looking for the last
5328 while ((dataptr = traceframe_find_block_type (dataptr,
5330 - (dataptr - database),
5331 tfnum, 'V')) != NULL)
5333 memcpy (&vnum, dataptr, sizeof (vnum));
5334 dataptr += sizeof (vnum);
5336 trace_debug ("traceframe %d has variable %d", tfnum, vnum);
5338 /* Check that this is the variable we want. */
5341 memcpy (val, dataptr, sizeof (*val));
5345 /* Skip over this block. */
5346 dataptr += sizeof (LONGEST);
5350 trace_debug ("traceframe %d has no data for variable %d",
5355 /* Read a requested block of static tracepoint data from a trace
5359 traceframe_read_sdata (int tfnum, ULONGEST offset,
5360 unsigned char *buf, ULONGEST length,
5363 struct traceframe *tframe;
5364 unsigned char *database, *dataptr;
5365 unsigned int datasize;
5366 unsigned short mlen;
5368 trace_debug ("traceframe_read_sdata");
5370 tframe = find_traceframe (tfnum);
5374 trace_debug ("traceframe %d not found", tfnum);
5378 datasize = tframe->data_size;
5379 database = &tframe->data[0];
5381 /* Iterate through a traceframe's blocks, looking for static
5383 dataptr = traceframe_find_block_type (database, datasize,
5385 if (dataptr != NULL)
5387 memcpy (&mlen, dataptr, sizeof (mlen));
5388 dataptr += sizeof (mlen);
5391 if (offset + length > mlen)
5392 length = mlen - offset;
5394 memcpy (buf, dataptr, length);
5402 trace_debug ("traceframe %d has no static trace data", tfnum);
5408 /* Callback for traceframe_walk_blocks. Builds a traceframe-info
5409 object. DATA is pointer to a struct buffer holding the
5410 traceframe-info object being built. */
5413 build_traceframe_info_xml (char blocktype, unsigned char *dataptr, void *data)
5415 struct buffer *buffer = (struct buffer *) data;
5421 unsigned short mlen;
5424 memcpy (&maddr, dataptr, sizeof (maddr));
5425 dataptr += sizeof (maddr);
5426 memcpy (&mlen, dataptr, sizeof (mlen));
5427 dataptr += sizeof (mlen);
5428 buffer_xml_printf (buffer,
5429 "<memory start=\"0x%s\" length=\"0x%s\"/>\n",
5430 paddress (maddr), phex_nz (mlen, sizeof (mlen)));
5437 memcpy (&vnum, dataptr, sizeof (vnum));
5438 buffer_xml_printf (buffer, "<tvar id=\"%d\"/>\n", vnum);
5447 warning ("Unhandled trace block type (%d) '%c ' "
5448 "while building trace frame info.",
5449 blocktype, blocktype);
5456 /* Build a traceframe-info object for traceframe number TFNUM into
5460 traceframe_read_info (int tfnum, struct buffer *buffer)
5462 struct traceframe *tframe;
5464 trace_debug ("traceframe_read_info");
5466 tframe = find_traceframe (tfnum);
5470 trace_debug ("traceframe %d not found", tfnum);
5474 buffer_grow_str (buffer, "<traceframe-info>\n");
5475 traceframe_walk_blocks (tframe->data, tframe->data_size,
5476 tfnum, build_traceframe_info_xml, buffer);
5477 buffer_grow_str0 (buffer, "</traceframe-info>\n");
5481 /* Return the first fast tracepoint whose jump pad contains PC. */
5483 static struct tracepoint *
5484 fast_tracepoint_from_jump_pad_address (CORE_ADDR pc)
5486 struct tracepoint *tpoint;
5488 for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
5489 if (tpoint->type == fast_tracepoint)
5490 if (tpoint->jump_pad <= pc && pc < tpoint->jump_pad_end)
5496 /* Return the first fast tracepoint whose trampoline contains PC. */
5498 static struct tracepoint *
5499 fast_tracepoint_from_trampoline_address (CORE_ADDR pc)
5501 struct tracepoint *tpoint;
5503 for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
5505 if (tpoint->type == fast_tracepoint
5506 && tpoint->trampoline <= pc && pc < tpoint->trampoline_end)
5513 /* Return GDBserver's tracepoint that matches the IP Agent's
5514 tracepoint object that lives at IPA_TPOINT_OBJ in the IP Agent's
5517 static struct tracepoint *
5518 fast_tracepoint_from_ipa_tpoint_address (CORE_ADDR ipa_tpoint_obj)
5520 struct tracepoint *tpoint;
5522 for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
5523 if (tpoint->type == fast_tracepoint)
5524 if (tpoint->obj_addr_on_target == ipa_tpoint_obj)
5532 /* The type of the object that is used to synchronize fast tracepoint
5535 typedef struct collecting_t
5537 /* The fast tracepoint number currently collecting. */
5540 /* A number that GDBserver can use to identify the thread that is
5541 presently holding the collect lock. This need not (and usually
5542 is not) the thread id, as getting the current thread ID usually
5543 requires a system call, which we want to avoid like the plague.
5544 Usually this is thread's TCB, found in the TLS (pseudo-)
5545 register, which is readable with a single insn on several
5547 uintptr_t thread_area;
5550 #ifndef IN_PROCESS_AGENT
5553 force_unlock_trace_buffer (void)
5555 write_inferior_data_pointer (ipa_sym_addrs.addr_collecting, 0);
5558 /* Check if the thread identified by THREAD_AREA which is stopped at
5559 STOP_PC, is presently locking the fast tracepoint collection, and
5560 if so, gather some status of said collection. Returns 0 if the
5561 thread isn't collecting or in the jump pad at all. 1, if in the
5562 jump pad (or within gdb_collect) and hasn't executed the adjusted
5563 original insn yet (can set a breakpoint there and run to it). 2,
5564 if presently executing the adjusted original insn --- in which
5565 case, if we want to move the thread out of the jump pad, we need to
5566 single-step it until this function returns 0. */
5569 fast_tracepoint_collecting (CORE_ADDR thread_area,
5571 struct fast_tpoint_collect_status *status)
5573 CORE_ADDR ipa_collecting;
5574 CORE_ADDR ipa_gdb_jump_pad_buffer, ipa_gdb_jump_pad_buffer_end;
5575 CORE_ADDR ipa_gdb_trampoline_buffer;
5576 CORE_ADDR ipa_gdb_trampoline_buffer_end;
5577 struct tracepoint *tpoint;
5578 int needs_breakpoint;
5580 /* The thread THREAD_AREA is either:
5582 0. not collecting at all, not within the jump pad, or within
5583 gdb_collect or one of its callees.
5585 1. in the jump pad and haven't reached gdb_collect
5587 2. within gdb_collect (out of the jump pad) (collect is set)
5589 3. we're in the jump pad, after gdb_collect having returned,
5590 possibly executing the adjusted insns.
5592 For cases 1 and 3, `collecting' may or not be set. The jump pad
5593 doesn't have any complicated jump logic, so we can tell if the
5594 thread is executing the adjust original insn or not by just
5595 matching STOP_PC with known jump pad addresses. If we it isn't
5596 yet executing the original insn, set a breakpoint there, and let
5597 the thread run to it, so to quickly step over a possible (many
5598 insns) gdb_collect call. Otherwise, or when the breakpoint is
5599 hit, only a few (small number of) insns are left to be executed
5600 in the jump pad. Single-step the thread until it leaves the
5605 needs_breakpoint = 0;
5606 trace_debug ("fast_tracepoint_collecting");
5608 if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer,
5609 &ipa_gdb_jump_pad_buffer))
5611 internal_error (__FILE__, __LINE__,
5612 "error extracting `gdb_jump_pad_buffer'");
5614 if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_jump_pad_buffer_end,
5615 &ipa_gdb_jump_pad_buffer_end))
5617 internal_error (__FILE__, __LINE__,
5618 "error extracting `gdb_jump_pad_buffer_end'");
5621 if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer,
5622 &ipa_gdb_trampoline_buffer))
5624 internal_error (__FILE__, __LINE__,
5625 "error extracting `gdb_trampoline_buffer'");
5627 if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_trampoline_buffer_end,
5628 &ipa_gdb_trampoline_buffer_end))
5630 internal_error (__FILE__, __LINE__,
5631 "error extracting `gdb_trampoline_buffer_end'");
5634 if (ipa_gdb_jump_pad_buffer <= stop_pc
5635 && stop_pc < ipa_gdb_jump_pad_buffer_end)
5637 /* We can tell which tracepoint(s) the thread is collecting by
5638 matching the jump pad address back to the tracepoint. */
5639 tpoint = fast_tracepoint_from_jump_pad_address (stop_pc);
5642 warning ("in jump pad, but no matching tpoint?");
5647 trace_debug ("in jump pad of tpoint (%d, %s); jump_pad(%s, %s); "
5649 tpoint->number, paddress (tpoint->address),
5650 paddress (tpoint->jump_pad),
5651 paddress (tpoint->jump_pad_end),
5652 paddress (tpoint->adjusted_insn_addr),
5653 paddress (tpoint->adjusted_insn_addr_end));
5656 /* Definitely in the jump pad. May or may not need
5657 fast-exit-jump-pad breakpoint. */
5658 if (tpoint->jump_pad <= stop_pc
5659 && stop_pc < tpoint->adjusted_insn_addr)
5660 needs_breakpoint = 1;
5662 else if (ipa_gdb_trampoline_buffer <= stop_pc
5663 && stop_pc < ipa_gdb_trampoline_buffer_end)
5665 /* We can tell which tracepoint(s) the thread is collecting by
5666 matching the trampoline address back to the tracepoint. */
5667 tpoint = fast_tracepoint_from_trampoline_address (stop_pc);
5670 warning ("in trampoline, but no matching tpoint?");
5675 trace_debug ("in trampoline of tpoint (%d, %s); trampoline(%s, %s)",
5676 tpoint->number, paddress (tpoint->address),
5677 paddress (tpoint->trampoline),
5678 paddress (tpoint->trampoline_end));
5681 /* Have not reached jump pad yet, but treat the trampoline as a
5682 part of the jump pad that is before the adjusted original
5684 needs_breakpoint = 1;
5688 collecting_t ipa_collecting_obj;
5690 /* If `collecting' is set/locked, then the THREAD_AREA thread
5691 may or not be the one holding the lock. We have to read the
5692 lock to find out. */
5694 if (read_inferior_data_pointer (ipa_sym_addrs.addr_collecting,
5697 trace_debug ("fast_tracepoint_collecting:"
5698 " failed reading 'collecting' in the inferior");
5702 if (!ipa_collecting)
5704 trace_debug ("fast_tracepoint_collecting: not collecting"
5705 " (and nobody is).");
5709 /* Some thread is collecting. Check which. */
5710 if (read_inferior_memory (ipa_collecting,
5711 (unsigned char *) &ipa_collecting_obj,
5712 sizeof (ipa_collecting_obj)) != 0)
5715 if (ipa_collecting_obj.thread_area != thread_area)
5717 trace_debug ("fast_tracepoint_collecting: not collecting "
5718 "(another thread is)");
5723 = fast_tracepoint_from_ipa_tpoint_address (ipa_collecting_obj.tpoint);
5726 warning ("fast_tracepoint_collecting: collecting, "
5727 "but tpoint %s not found?",
5728 paddress ((CORE_ADDR) ipa_collecting_obj.tpoint));
5732 /* The thread is within `gdb_collect', skip over the rest of
5733 fast tracepoint collection quickly using a breakpoint. */
5734 needs_breakpoint = 1;
5737 /* The caller wants a bit of status detail. */
5740 status->tpoint_num = tpoint->number;
5741 status->tpoint_addr = tpoint->address;
5742 status->adjusted_insn_addr = tpoint->adjusted_insn_addr;
5743 status->adjusted_insn_addr_end = tpoint->adjusted_insn_addr_end;
5746 if (needs_breakpoint)
5748 /* Hasn't executed the original instruction yet. Set breakpoint
5749 there, and wait till it's hit, then single-step until exiting
5753 fast_tracepoint_collecting, returning continue-until-break at %s",
5754 paddress (tpoint->adjusted_insn_addr));
5756 return 1; /* continue */
5760 /* Just single-step until exiting the jump pad. */
5762 trace_debug ("fast_tracepoint_collecting, returning "
5763 "need-single-step (%s-%s)",
5764 paddress (tpoint->adjusted_insn_addr),
5765 paddress (tpoint->adjusted_insn_addr_end));
5767 return 2; /* single-step */
5773 #ifdef IN_PROCESS_AGENT
5775 /* The global fast tracepoint collect lock. Points to a collecting_t
5776 object built on the stack by the jump pad, if presently locked;
5777 NULL if it isn't locked. Note that this lock *must* be set while
5778 executing any *function other than the jump pad. See
5779 fast_tracepoint_collecting. */
5781 IP_AGENT_EXPORT_VAR collecting_t *collecting;
5784 /* This routine, called from the jump pad (in asm) is designed to be
5785 called from the jump pads of fast tracepoints, thus it is on the
5788 IP_AGENT_EXPORT_FUNC void
5789 gdb_collect (struct tracepoint *tpoint, unsigned char *regs)
5791 struct fast_tracepoint_ctx ctx;
5793 /* Don't do anything until the trace run is completely set up. */
5797 ctx.base.type = fast_tracepoint;
5799 ctx.regcache_initted = 0;
5800 /* Wrap the regblock in a register cache (in the stack, we don't
5801 want to malloc here). */
5802 ctx.regspace = (unsigned char *) alloca (ipa_tdesc->registers_size);
5803 if (ctx.regspace == NULL)
5805 trace_debug ("Trace buffer block allocation failed, skipping");
5809 for (ctx.tpoint = tpoint;
5810 ctx.tpoint != NULL && ctx.tpoint->address == tpoint->address;
5811 ctx.tpoint = ctx.tpoint->next)
5813 if (!ctx.tpoint->enabled)
5816 /* Multiple tracepoints of different types, such as fast tracepoint and
5817 static tracepoint, can be set at the same address. */
5818 if (ctx.tpoint->type != tpoint->type)
5821 /* Test the condition if present, and collect if true. */
5822 if (ctx.tpoint->cond == NULL
5823 || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx,
5826 collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx,
5827 ctx.tpoint->address, ctx.tpoint);
5829 /* Note that this will cause original insns to be written back
5830 to where we jumped from, but that's OK because we're jumping
5831 back to the next whole instruction. This will go badly if
5832 instruction restoration is not atomic though. */
5833 if (stopping_tracepoint
5834 || trace_buffer_is_full
5835 || expr_eval_result != expr_eval_no_error)
5843 /* If there was a condition and it evaluated to false, the only
5844 way we would stop tracing is if there was an error during
5845 condition expression evaluation. */
5846 if (expr_eval_result != expr_eval_no_error)
5857 #ifndef IN_PROCESS_AGENT
5860 get_raw_reg_func_addr (void)
5862 return ipa_sym_addrs.addr_get_raw_reg;
5866 get_get_tsv_func_addr (void)
5868 return ipa_sym_addrs.addr_get_trace_state_variable_value;
5872 get_set_tsv_func_addr (void)
5874 return ipa_sym_addrs.addr_set_trace_state_variable_value;
5878 compile_tracepoint_condition (struct tracepoint *tpoint,
5879 CORE_ADDR *jump_entry)
5881 CORE_ADDR entry_point = *jump_entry;
5882 enum eval_result_type err;
5884 trace_debug ("Starting condition compilation for tracepoint %d\n",
5887 /* Initialize the global pointer to the code being built. */
5888 current_insn_ptr = *jump_entry;
5892 err = compile_bytecodes (tpoint->cond);
5894 if (err == expr_eval_no_error)
5898 /* Record the beginning of the compiled code. */
5899 tpoint->compiled_cond = entry_point;
5901 trace_debug ("Condition compilation for tracepoint %d complete\n",
5906 /* Leave the unfinished code in situ, but don't point to it. */
5908 tpoint->compiled_cond = 0;
5910 trace_debug ("Condition compilation for tracepoint %d failed, "
5912 tpoint->number, err);
5915 /* Update the code pointer passed in. Note that we do this even if
5916 the compile fails, so that we can look at the partial results
5917 instead of letting them be overwritten. */
5918 *jump_entry = current_insn_ptr;
5920 /* Leave a gap, to aid dump decipherment. */
5924 /* We'll need to adjust these when we consider bi-arch setups, and big
5928 write_inferior_data_ptr (CORE_ADDR where, CORE_ADDR ptr)
5930 return write_inferior_memory (where,
5931 (unsigned char *) &ptr, sizeof (void *));
5934 /* The base pointer of the IPA's heap. This is the only memory the
5935 IPA is allowed to use. The IPA should _not_ call the inferior's
5936 `malloc' during operation. That'd be slow, and, most importantly,
5937 it may not be safe. We may be collecting a tracepoint in a signal
5938 handler, for example. */
5939 static CORE_ADDR target_tp_heap;
5941 /* Allocate at least SIZE bytes of memory from the IPA heap, aligned
5945 target_malloc (ULONGEST size)
5949 if (target_tp_heap == 0)
5951 /* We have the pointer *address*, need what it points to. */
5952 if (read_inferior_data_pointer (ipa_sym_addrs.addr_gdb_tp_heap_buffer,
5955 internal_error (__FILE__, __LINE__,
5956 "couldn't get target heap head pointer");
5960 ptr = target_tp_heap;
5961 target_tp_heap += size;
5963 /* Pad to 8-byte alignment. */
5964 target_tp_heap = ((target_tp_heap + 7) & ~0x7);
5970 download_agent_expr (struct agent_expr *expr)
5972 CORE_ADDR expr_addr;
5973 CORE_ADDR expr_bytes;
5975 expr_addr = target_malloc (sizeof (*expr));
5976 write_inferior_memory (expr_addr, (unsigned char *) expr, sizeof (*expr));
5978 expr_bytes = target_malloc (expr->length);
5979 write_inferior_data_ptr (expr_addr + offsetof (struct agent_expr, bytes),
5981 write_inferior_memory (expr_bytes, expr->bytes, expr->length);
5986 /* Align V up to N bits. */
5987 #define UALIGN(V, N) (((V) + ((N) - 1)) & ~((N) - 1))
5989 /* Sync tracepoint with IPA, but leave maintenance of linked list to caller. */
5992 download_tracepoint_1 (struct tracepoint *tpoint)
5994 struct tracepoint target_tracepoint;
5995 CORE_ADDR tpptr = 0;
5997 gdb_assert (tpoint->type == fast_tracepoint
5998 || tpoint->type == static_tracepoint);
6000 if (tpoint->cond != NULL && target_emit_ops () != NULL)
6002 CORE_ADDR jentry, jump_entry;
6004 jentry = jump_entry = get_jump_space_head ();
6006 if (tpoint->cond != NULL)
6008 /* Pad to 8-byte alignment. (needed?) */
6009 /* Actually this should be left for the target to
6011 jentry = UALIGN (jentry, 8);
6013 compile_tracepoint_condition (tpoint, &jentry);
6016 /* Pad to 8-byte alignment. */
6017 jentry = UALIGN (jentry, 8);
6018 claim_jump_space (jentry - jump_entry);
6021 target_tracepoint = *tpoint;
6023 tpptr = target_malloc (sizeof (*tpoint));
6024 tpoint->obj_addr_on_target = tpptr;
6026 /* Write the whole object. We'll fix up its pointers in a bit.
6027 Assume no next for now. This is fixed up above on the next
6028 iteration, if there's any. */
6029 target_tracepoint.next = NULL;
6030 /* Need to clear this here too, since we're downloading the
6031 tracepoints before clearing our own copy. */
6032 target_tracepoint.hit_count = 0;
6034 write_inferior_memory (tpptr, (unsigned char *) &target_tracepoint,
6035 sizeof (target_tracepoint));
6038 write_inferior_data_ptr (tpptr + offsetof (struct tracepoint,
6040 download_agent_expr (tpoint->cond));
6042 if (tpoint->numactions)
6045 CORE_ADDR actions_array;
6047 /* The pointers array. */
6049 = target_malloc (sizeof (*tpoint->actions) * tpoint->numactions);
6050 write_inferior_data_ptr (tpptr + offsetof (struct tracepoint,
6054 /* Now for each pointer, download the action. */
6055 for (i = 0; i < tpoint->numactions; i++)
6057 struct tracepoint_action *action = tpoint->actions[i];
6058 CORE_ADDR ipa_action = action->ops->download (action);
6060 if (ipa_action != 0)
6061 write_inferior_data_ptr
6062 (actions_array + i * sizeof (*tpoint->actions),
6068 #define IPA_PROTO_FAST_TRACE_FLAG 0
6069 #define IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET 2
6070 #define IPA_PROTO_FAST_TRACE_JUMP_PAD 10
6071 #define IPA_PROTO_FAST_TRACE_FJUMP_SIZE 18
6072 #define IPA_PROTO_FAST_TRACE_FJUMP_INSN 22
6074 /* Send a command to agent to download and install tracepoint TPOINT. */
6077 tracepoint_send_agent (struct tracepoint *tpoint)
6079 char buf[IPA_CMD_BUF_SIZE];
6084 strcpy (p, "FastTrace:");
6087 COPY_FIELD_TO_BUF (p, tpoint, number);
6088 COPY_FIELD_TO_BUF (p, tpoint, address);
6089 COPY_FIELD_TO_BUF (p, tpoint, type);
6090 COPY_FIELD_TO_BUF (p, tpoint, enabled);
6091 COPY_FIELD_TO_BUF (p, tpoint, step_count);
6092 COPY_FIELD_TO_BUF (p, tpoint, pass_count);
6093 COPY_FIELD_TO_BUF (p, tpoint, numactions);
6094 COPY_FIELD_TO_BUF (p, tpoint, hit_count);
6095 COPY_FIELD_TO_BUF (p, tpoint, traceframe_usage);
6096 COPY_FIELD_TO_BUF (p, tpoint, compiled_cond);
6097 COPY_FIELD_TO_BUF (p, tpoint, orig_size);
6100 p = agent_expr_send (p, tpoint->cond);
6102 /* tracepoint_action */
6103 for (i = 0; i < tpoint->numactions; i++)
6105 struct tracepoint_action *action = tpoint->actions[i];
6107 p[0] = action->type;
6108 p = action->ops->send (&p[1], action);
6111 get_jump_space_head ();
6112 /* Copy the value of GDB_JUMP_PAD_HEAD to command buffer, so that
6113 agent can use jump pad from it. */
6114 if (tpoint->type == fast_tracepoint)
6116 memcpy (p, &gdb_jump_pad_head, 8);
6120 ret = run_inferior_command (buf, (int) (ptrdiff_t) (p - buf));
6124 if (!startswith (buf, "OK"))
6127 /* The value of tracepoint's target address is stored in BUF. */
6128 memcpy (&tpoint->obj_addr_on_target,
6129 &buf[IPA_PROTO_FAST_TRACE_ADDR_ON_TARGET], 8);
6131 if (tpoint->type == fast_tracepoint)
6134 = (unsigned char *) &buf[IPA_PROTO_FAST_TRACE_FJUMP_INSN];
6137 trace_debug ("agent: read from cmd_buf 0x%x 0x%x\n",
6138 (unsigned int) tpoint->obj_addr_on_target,
6139 (unsigned int) gdb_jump_pad_head);
6141 memcpy (&gdb_jump_pad_head, &buf[IPA_PROTO_FAST_TRACE_JUMP_PAD], 8);
6143 /* This has been done in agent. We should also set up record for it. */
6144 memcpy (&fjump_size, &buf[IPA_PROTO_FAST_TRACE_FJUMP_SIZE], 4);
6147 = set_fast_tracepoint_jump (tpoint->address, insn, fjump_size);
6154 download_tracepoint (struct tracepoint *tpoint)
6156 struct tracepoint *tp, *tp_prev;
6158 if (tpoint->type != fast_tracepoint
6159 && tpoint->type != static_tracepoint)
6162 download_tracepoint_1 (tpoint);
6164 /* Find the previous entry of TPOINT, which is fast tracepoint or
6165 static tracepoint. */
6167 for (tp = tracepoints; tp != tpoint; tp = tp->next)
6169 if (tp->type == fast_tracepoint || tp->type == static_tracepoint)
6175 CORE_ADDR tp_prev_target_next_addr;
6177 /* Insert TPOINT after TP_PREV in IPA. */
6178 if (read_inferior_data_pointer (tp_prev->obj_addr_on_target
6179 + offsetof (struct tracepoint, next),
6180 &tp_prev_target_next_addr))
6182 internal_error (__FILE__, __LINE__,
6183 "error reading `tp_prev->next'");
6186 /* tpoint->next = tp_prev->next */
6187 write_inferior_data_ptr (tpoint->obj_addr_on_target
6188 + offsetof (struct tracepoint, next),
6189 tp_prev_target_next_addr);
6190 /* tp_prev->next = tpoint */
6191 write_inferior_data_ptr (tp_prev->obj_addr_on_target
6192 + offsetof (struct tracepoint, next),
6193 tpoint->obj_addr_on_target);
6196 /* First object in list, set the head pointer in the
6198 write_inferior_data_ptr (ipa_sym_addrs.addr_tracepoints,
6199 tpoint->obj_addr_on_target);
6204 download_trace_state_variables (void)
6206 CORE_ADDR ptr = 0, prev_ptr = 0;
6207 struct trace_state_variable *tsv;
6209 /* Start out empty. */
6210 write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables, 0);
6212 for (tsv = trace_state_variables; tsv != NULL; tsv = tsv->next)
6214 struct trace_state_variable target_tsv;
6216 /* TSV's with a getter have been initialized equally in both the
6217 inferior and GDBserver. Skip them. */
6218 if (tsv->getter != NULL)
6224 ptr = target_malloc (sizeof (*tsv));
6226 if (tsv == trace_state_variables)
6228 /* First object in list, set the head pointer in the
6231 write_inferior_data_ptr (ipa_sym_addrs.addr_trace_state_variables,
6236 write_inferior_data_ptr (prev_ptr
6237 + offsetof (struct trace_state_variable,
6242 /* Write the whole object. We'll fix up its pointers in a bit.
6243 Assume no next, fixup when needed. */
6244 target_tsv.next = NULL;
6246 write_inferior_memory (ptr, (unsigned char *) &target_tsv,
6247 sizeof (target_tsv));
6249 if (tsv->name != NULL)
6251 size_t size = strlen (tsv->name) + 1;
6252 CORE_ADDR name_addr = target_malloc (size);
6253 write_inferior_memory (name_addr,
6254 (unsigned char *) tsv->name, size);
6255 write_inferior_data_ptr (ptr
6256 + offsetof (struct trace_state_variable,
6261 gdb_assert (tsv->getter == NULL);
6266 /* Fixup the next pointer in the last item in the list. */
6267 write_inferior_data_ptr (prev_ptr
6268 + offsetof (struct trace_state_variable,
6273 /* Upload complete trace frames out of the IP Agent's trace buffer
6274 into GDBserver's trace buffer. This always uploads either all or
6275 no trace frames. This is the counter part of
6276 `trace_alloc_trace_buffer'. See its description of the atomic
6277 synching mechanism. */
6280 upload_fast_traceframes (void)
6282 unsigned int ipa_traceframe_read_count, ipa_traceframe_write_count;
6283 unsigned int ipa_traceframe_read_count_racy, ipa_traceframe_write_count_racy;
6285 struct ipa_trace_buffer_control ipa_trace_buffer_ctrl;
6286 unsigned int curr_tbctrl_idx;
6287 unsigned int ipa_trace_buffer_ctrl_curr;
6288 unsigned int ipa_trace_buffer_ctrl_curr_old;
6289 CORE_ADDR ipa_trace_buffer_ctrl_addr;
6290 struct breakpoint *about_to_request_buffer_space_bkpt;
6291 CORE_ADDR ipa_trace_buffer_lo;
6292 CORE_ADDR ipa_trace_buffer_hi;
6294 if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count,
6295 &ipa_traceframe_read_count_racy))
6297 /* This will happen in most targets if the current thread is
6302 if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count,
6303 &ipa_traceframe_write_count_racy))
6306 trace_debug ("ipa_traceframe_count (racy area): %d (w=%d, r=%d)",
6307 ipa_traceframe_write_count_racy
6308 - ipa_traceframe_read_count_racy,
6309 ipa_traceframe_write_count_racy,
6310 ipa_traceframe_read_count_racy);
6312 if (ipa_traceframe_write_count_racy == ipa_traceframe_read_count_racy)
6315 about_to_request_buffer_space_bkpt
6316 = set_breakpoint_at (ipa_sym_addrs.addr_about_to_request_buffer_space,
6319 if (read_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr,
6320 &ipa_trace_buffer_ctrl_curr))
6323 ipa_trace_buffer_ctrl_curr_old = ipa_trace_buffer_ctrl_curr;
6325 curr_tbctrl_idx = ipa_trace_buffer_ctrl_curr & ~GDBSERVER_FLUSH_COUNT_MASK;
6328 unsigned int prev, counter;
6330 /* Update the token, with new counters, and the GDBserver stamp
6331 bit. Alway reuse the current TBC index. */
6332 prev = ipa_trace_buffer_ctrl_curr & GDBSERVER_FLUSH_COUNT_MASK_CURR;
6333 counter = (prev + 0x100) & GDBSERVER_FLUSH_COUNT_MASK_CURR;
6335 ipa_trace_buffer_ctrl_curr = (GDBSERVER_UPDATED_FLUSH_COUNT_BIT
6341 if (write_inferior_uinteger (ipa_sym_addrs.addr_trace_buffer_ctrl_curr,
6342 ipa_trace_buffer_ctrl_curr))
6345 trace_debug ("Lib: Committed %08x -> %08x",
6346 ipa_trace_buffer_ctrl_curr_old,
6347 ipa_trace_buffer_ctrl_curr);
6349 /* Re-read these, now that we've installed the
6350 `about_to_request_buffer_space' breakpoint/lock. A thread could
6351 have finished a traceframe between the last read of these
6352 counters and setting the breakpoint above. If we start
6353 uploading, we never want to leave this function with
6354 traceframe_read_count != 0, otherwise, GDBserver could end up
6355 incrementing the counter tokens more than once (due to event loop
6356 nesting), which would break the IP agent's "effective" detection
6357 (see trace_alloc_trace_buffer). */
6358 if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_read_count,
6359 &ipa_traceframe_read_count))
6361 if (read_inferior_uinteger (ipa_sym_addrs.addr_traceframe_write_count,
6362 &ipa_traceframe_write_count))
6367 trace_debug ("ipa_traceframe_count (blocked area): %d (w=%d, r=%d)",
6368 ipa_traceframe_write_count - ipa_traceframe_read_count,
6369 ipa_traceframe_write_count, ipa_traceframe_read_count);
6371 if (ipa_traceframe_write_count != ipa_traceframe_write_count_racy
6372 || ipa_traceframe_read_count != ipa_traceframe_read_count_racy)
6373 trace_debug ("note that ipa_traceframe_count's parts changed");
6376 /* Get the address of the current TBC object (the IP agent has an
6377 array of 3 such objects). The index is stored in the TBC
6379 ipa_trace_buffer_ctrl_addr = ipa_sym_addrs.addr_trace_buffer_ctrl;
6380 ipa_trace_buffer_ctrl_addr
6381 += sizeof (struct ipa_trace_buffer_control) * curr_tbctrl_idx;
6383 if (read_inferior_memory (ipa_trace_buffer_ctrl_addr,
6384 (unsigned char *) &ipa_trace_buffer_ctrl,
6385 sizeof (struct ipa_trace_buffer_control)))
6388 if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_lo,
6389 &ipa_trace_buffer_lo))
6391 if (read_inferior_data_pointer (ipa_sym_addrs.addr_trace_buffer_hi,
6392 &ipa_trace_buffer_hi))
6395 /* Offsets are easier to grok for debugging than raw addresses,
6396 especially for the small trace buffer sizes that are useful for
6398 trace_debug ("Lib: Trace buffer [%d] start=%d free=%d "
6399 "endfree=%d wrap=%d hi=%d",
6401 (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo),
6402 (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo),
6403 (int) (ipa_trace_buffer_ctrl.end_free - ipa_trace_buffer_lo),
6404 (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo),
6405 (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo));
6407 /* Note that the IPA's buffer is always circular. */
6409 #define IPA_FIRST_TRACEFRAME() (ipa_trace_buffer_ctrl.start)
6411 #define IPA_NEXT_TRACEFRAME_1(TF, TFOBJ) \
6412 ((TF) + sizeof (struct traceframe) + (TFOBJ)->data_size)
6414 #define IPA_NEXT_TRACEFRAME(TF, TFOBJ) \
6415 (IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) \
6416 - ((IPA_NEXT_TRACEFRAME_1 (TF, TFOBJ) >= ipa_trace_buffer_ctrl.wrap) \
6417 ? (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo) \
6420 tf = IPA_FIRST_TRACEFRAME ();
6422 while (ipa_traceframe_write_count - ipa_traceframe_read_count)
6424 struct tracepoint *tpoint;
6425 struct traceframe *tframe;
6426 unsigned char *block;
6427 struct traceframe ipa_tframe;
6429 if (read_inferior_memory (tf, (unsigned char *) &ipa_tframe,
6430 offsetof (struct traceframe, data)))
6431 error ("Uploading: couldn't read traceframe at %s\n", paddress (tf));
6433 if (ipa_tframe.tpnum == 0)
6435 internal_error (__FILE__, __LINE__,
6436 "Uploading: No (more) fast traceframes, but"
6437 " ipa_traceframe_count == %u??\n",
6438 ipa_traceframe_write_count
6439 - ipa_traceframe_read_count);
6442 /* Note that this will be incorrect for multi-location
6444 tpoint = find_next_tracepoint_by_number (NULL, ipa_tframe.tpnum);
6446 tframe = add_traceframe (tpoint);
6449 trace_buffer_is_full = 1;
6450 trace_debug ("Uploading: trace buffer is full");
6454 /* Copy the whole set of blocks in one go for now. FIXME:
6455 split this in smaller blocks. */
6456 block = add_traceframe_block (tframe, tpoint,
6457 ipa_tframe.data_size);
6460 if (read_inferior_memory (tf
6461 + offsetof (struct traceframe, data),
6462 block, ipa_tframe.data_size))
6463 error ("Uploading: Couldn't read traceframe data at %s\n",
6464 paddress (tf + offsetof (struct traceframe, data)));
6467 trace_debug ("Uploading: traceframe didn't fit");
6468 finish_traceframe (tframe);
6471 tf = IPA_NEXT_TRACEFRAME (tf, &ipa_tframe);
6473 /* If we freed the traceframe that wrapped around, go back
6474 to the non-wrap case. */
6475 if (tf < ipa_trace_buffer_ctrl.start)
6477 trace_debug ("Lib: Discarding past the wraparound");
6478 ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi;
6480 ipa_trace_buffer_ctrl.start = tf;
6481 ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_ctrl.start;
6482 ++ipa_traceframe_read_count;
6484 if (ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.free
6485 && ipa_trace_buffer_ctrl.start == ipa_trace_buffer_ctrl.end_free)
6487 trace_debug ("Lib: buffer is fully empty. "
6488 "Trace buffer [%d] start=%d free=%d endfree=%d",
6490 (int) (ipa_trace_buffer_ctrl.start
6491 - ipa_trace_buffer_lo),
6492 (int) (ipa_trace_buffer_ctrl.free
6493 - ipa_trace_buffer_lo),
6494 (int) (ipa_trace_buffer_ctrl.end_free
6495 - ipa_trace_buffer_lo));
6497 ipa_trace_buffer_ctrl.start = ipa_trace_buffer_lo;
6498 ipa_trace_buffer_ctrl.free = ipa_trace_buffer_lo;
6499 ipa_trace_buffer_ctrl.end_free = ipa_trace_buffer_hi;
6500 ipa_trace_buffer_ctrl.wrap = ipa_trace_buffer_hi;
6503 trace_debug ("Uploaded a traceframe\n"
6504 "Lib: Trace buffer [%d] start=%d free=%d "
6505 "endfree=%d wrap=%d hi=%d",
6507 (int) (ipa_trace_buffer_ctrl.start - ipa_trace_buffer_lo),
6508 (int) (ipa_trace_buffer_ctrl.free - ipa_trace_buffer_lo),
6509 (int) (ipa_trace_buffer_ctrl.end_free
6510 - ipa_trace_buffer_lo),
6511 (int) (ipa_trace_buffer_ctrl.wrap - ipa_trace_buffer_lo),
6512 (int) (ipa_trace_buffer_hi - ipa_trace_buffer_lo));
6515 if (write_inferior_memory (ipa_trace_buffer_ctrl_addr,
6516 (unsigned char *) &ipa_trace_buffer_ctrl,
6517 sizeof (struct ipa_trace_buffer_control)))
6520 write_inferior_integer (ipa_sym_addrs.addr_traceframe_read_count,
6521 ipa_traceframe_read_count);
6523 trace_debug ("Done uploading traceframes [%d]\n", curr_tbctrl_idx);
6527 delete_breakpoint (about_to_request_buffer_space_bkpt);
6528 about_to_request_buffer_space_bkpt = NULL;
6532 if (trace_buffer_is_full)
6537 #ifdef IN_PROCESS_AGENT
6539 IP_AGENT_EXPORT_VAR int ust_loaded;
6540 IP_AGENT_EXPORT_VAR char cmd_buf[IPA_CMD_BUF_SIZE];
6544 /* Static tracepoints. */
6546 /* UST puts a "struct tracepoint" in the global namespace, which
6547 conflicts with our tracepoint. Arguably, being a library, it
6548 shouldn't take ownership of such a generic name. We work around it
6550 #define tracepoint ust_tracepoint
6551 #include <ust/ust.h>
6554 extern int serialize_to_text (char *outbuf, int bufsize,
6555 const char *fmt, va_list ap);
6557 #define GDB_PROBE_NAME "gdb"
6559 /* We dynamically search for the UST symbols instead of linking them
6560 in. This lets the user decide if the application uses static
6561 tracepoints, instead of always pulling libust.so in. This vector
6562 holds pointers to all functions we care about. */
6566 int (*serialize_to_text) (char *outbuf, int bufsize,
6567 const char *fmt, va_list ap);
6569 int (*ltt_probe_register) (struct ltt_available_probe *pdata);
6570 int (*ltt_probe_unregister) (struct ltt_available_probe *pdata);
6572 int (*ltt_marker_connect) (const char *channel, const char *mname,
6574 int (*ltt_marker_disconnect) (const char *channel, const char *mname,
6577 void (*marker_iter_start) (struct marker_iter *iter);
6578 void (*marker_iter_next) (struct marker_iter *iter);
6579 void (*marker_iter_stop) (struct marker_iter *iter);
6580 void (*marker_iter_reset) (struct marker_iter *iter);
6585 /* Cast through typeof to catch incompatible API changes. Since UST
6586 only builds with gcc, we can freely use gcc extensions here
6588 #define GET_UST_SYM(SYM) \
6591 if (ust_ops.SYM == NULL) \
6592 ust_ops.SYM = (typeof (&SYM)) dlsym (RTLD_DEFAULT, #SYM); \
6593 if (ust_ops.SYM == NULL) \
6597 #define USTF(SYM) ust_ops.SYM
6599 /* Get pointers to all libust.so functions we care about. */
6604 GET_UST_SYM (serialize_to_text);
6606 GET_UST_SYM (ltt_probe_register);
6607 GET_UST_SYM (ltt_probe_unregister);
6608 GET_UST_SYM (ltt_marker_connect);
6609 GET_UST_SYM (ltt_marker_disconnect);
6611 GET_UST_SYM (marker_iter_start);
6612 GET_UST_SYM (marker_iter_next);
6613 GET_UST_SYM (marker_iter_stop);
6614 GET_UST_SYM (marker_iter_reset);
6620 /* Given an UST marker, return the matching gdb static tracepoint.
6621 The match is done by address. */
6623 static struct tracepoint *
6624 ust_marker_to_static_tracepoint (const struct marker *mdata)
6626 struct tracepoint *tpoint;
6628 for (tpoint = tracepoints; tpoint; tpoint = tpoint->next)
6630 if (tpoint->type != static_tracepoint)
6633 if (tpoint->address == (uintptr_t) mdata->location)
6640 /* The probe function we install on lttng/ust markers. Whenever a
6641 probed ust marker is hit, this function is called. This is similar
6642 to gdb_collect, only for static tracepoints, instead of fast
6646 gdb_probe (const struct marker *mdata, void *probe_private,
6647 struct registers *regs, void *call_private,
6648 const char *fmt, va_list *args)
6650 struct tracepoint *tpoint;
6651 struct static_tracepoint_ctx ctx;
6653 /* Don't do anything until the trace run is completely set up. */
6656 trace_debug ("gdb_probe: not tracing\n");
6660 ctx.base.type = static_tracepoint;
6661 ctx.regcache_initted = 0;
6666 /* Wrap the regblock in a register cache (in the stack, we don't
6667 want to malloc here). */
6668 ctx.regspace = alloca (ipa_tdesc->registers_size);
6669 if (ctx.regspace == NULL)
6671 trace_debug ("Trace buffer block allocation failed, skipping");
6675 tpoint = ust_marker_to_static_tracepoint (mdata);
6678 trace_debug ("gdb_probe: marker not known: "
6679 "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
6680 mdata->location, mdata->channel,
6681 mdata->name, mdata->format);
6685 if (!tpoint->enabled)
6687 trace_debug ("gdb_probe: tracepoint disabled");
6691 ctx.tpoint = tpoint;
6693 trace_debug ("gdb_probe: collecting marker: "
6694 "loc:0x%p, ch:\"%s\",n:\"%s\",f:\"%s\"",
6695 mdata->location, mdata->channel,
6696 mdata->name, mdata->format);
6698 /* Test the condition if present, and collect if true. */
6699 if (tpoint->cond == NULL
6700 || condition_true_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx,
6703 collect_data_at_tracepoint ((struct tracepoint_hit_ctx *) &ctx,
6704 tpoint->address, tpoint);
6706 if (stopping_tracepoint
6707 || trace_buffer_is_full
6708 || expr_eval_result != expr_eval_no_error)
6713 /* If there was a condition and it evaluated to false, the only
6714 way we would stop tracing is if there was an error during
6715 condition expression evaluation. */
6716 if (expr_eval_result != expr_eval_no_error)
6721 /* Called if the gdb static tracepoint requested collecting "$_sdata",
6722 static tracepoint string data. This is a string passed to the
6723 tracing library by the user, at the time of the tracepoint marker
6724 call. E.g., in the UST marker call:
6726 trace_mark (ust, bar33, "str %s", "FOOBAZ");
6728 the collected data is "str FOOBAZ".
6732 collect_ust_data_at_tracepoint (struct tracepoint_hit_ctx *ctx,
6733 struct traceframe *tframe)
6735 struct static_tracepoint_ctx *umd = (struct static_tracepoint_ctx *) ctx;
6736 unsigned char *bufspace;
6739 unsigned short blocklen;
6743 trace_debug ("Wanted to collect static trace data, "
6744 "but there's no static trace data");
6748 va_copy (copy, *umd->args);
6749 size = USTF(serialize_to_text) (NULL, 0, umd->fmt, copy);
6752 trace_debug ("Want to collect ust data");
6754 /* 'S' + size + string */
6755 bufspace = add_traceframe_block (tframe, umd->tpoint,
6756 1 + sizeof (blocklen) + size + 1);
6757 if (bufspace == NULL)
6759 trace_debug ("Trace buffer block allocation failed, skipping");
6763 /* Identify a static trace data block. */
6766 blocklen = size + 1;
6767 memcpy (bufspace + 1, &blocklen, sizeof (blocklen));
6769 va_copy (copy, *umd->args);
6770 USTF(serialize_to_text) ((char *) bufspace + 1 + sizeof (blocklen),
6771 size + 1, umd->fmt, copy);
6774 trace_debug ("Storing static tracepoint data in regblock: %s",
6775 bufspace + 1 + sizeof (blocklen));
6778 /* The probe to register with lttng/ust. */
6779 static struct ltt_available_probe gdb_ust_probe =
6786 #endif /* HAVE_UST */
6787 #endif /* IN_PROCESS_AGENT */
6789 #ifndef IN_PROCESS_AGENT
6791 /* Ask the in-process agent to run a command. Since we don't want to
6792 have to handle the IPA hitting breakpoints while running the
6793 command, we pause all threads, remove all breakpoints, and then set
6794 the helper thread re-running. We communicate with the helper
6795 thread by means of direct memory xfering, and a socket for
6799 run_inferior_command (char *cmd, int len)
6802 int pid = ptid_get_pid (current_ptid);
6804 trace_debug ("run_inferior_command: running: %s", cmd);
6807 uninsert_all_breakpoints ();
6809 err = agent_run_command (pid, (const char *) cmd, len);
6811 reinsert_all_breakpoints ();
6817 #else /* !IN_PROCESS_AGENT */
6819 #include <sys/socket.h>
6822 #ifndef UNIX_PATH_MAX
6823 #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *) NULL)->sun_path)
6826 /* Where we put the socked used for synchronization. */
6827 #define SOCK_DIR P_tmpdir
6829 /* Thread ID of the helper thread. GDBserver reads this to know which
6830 is the help thread. This is an LWP id on Linux. */
6832 IP_AGENT_EXPORT_VAR int helper_thread_id;
6836 init_named_socket (const char *name)
6839 struct sockaddr_un addr;
6841 result = fd = socket (PF_UNIX, SOCK_STREAM, 0);
6844 warning ("socket creation failed: %s", strerror (errno));
6848 addr.sun_family = AF_UNIX;
6850 strncpy (addr.sun_path, name, UNIX_PATH_MAX);
6851 addr.sun_path[UNIX_PATH_MAX - 1] = '\0';
6853 result = access (name, F_OK);
6857 result = unlink (name);
6860 warning ("unlink failed: %s", strerror (errno));
6864 warning ("socket %s already exists; overwriting", name);
6867 result = bind (fd, (struct sockaddr *) &addr, sizeof (addr));
6870 warning ("bind failed: %s", strerror (errno));
6875 result = listen (fd, 1);
6878 warning ("listen: %s", strerror (errno));
6886 static char agent_socket_name[UNIX_PATH_MAX];
6889 gdb_agent_socket_init (void)
6893 result = xsnprintf (agent_socket_name, UNIX_PATH_MAX, "%s/gdb_ust%d",
6894 SOCK_DIR, getpid ());
6895 if (result >= UNIX_PATH_MAX)
6897 trace_debug ("string overflow allocating socket name");
6901 fd = init_named_socket (agent_socket_name);
6903 warning ("Error initializing named socket (%s) for communication with the "
6904 "ust helper thread. Check that directory exists and that it "
6905 "is writable.", agent_socket_name);
6912 /* The next marker to be returned on a qTsSTM command. */
6913 static const struct marker *next_st;
6915 /* Returns the first known marker. */
6920 struct marker_iter iter;
6922 USTF(marker_iter_reset) (&iter);
6923 USTF(marker_iter_start) (&iter);
6928 /* Returns the marker following M. */
6930 const struct marker *
6931 next_marker (const struct marker *m)
6933 struct marker_iter iter;
6935 USTF(marker_iter_reset) (&iter);
6936 USTF(marker_iter_start) (&iter);
6938 for (; iter.marker != NULL; USTF(marker_iter_next) (&iter))
6940 if (iter.marker == m)
6942 USTF(marker_iter_next) (&iter);
6950 /* Return an hexstr version of the STR C string, fit for sending to
6954 cstr_to_hexstr (const char *str)
6956 int len = strlen (str);
6957 char *hexstr = xmalloc (len * 2 + 1);
6958 bin2hex ((gdb_byte *) str, hexstr, len);
6962 /* Compose packet that is the response to the qTsSTM/qTfSTM/qTSTMat
6966 response_ust_marker (char *packet, const struct marker *st)
6968 char *strid, *format, *tmp;
6970 next_st = next_marker (st);
6972 tmp = xmalloc (strlen (st->channel) + 1 +
6973 strlen (st->name) + 1);
6974 sprintf (tmp, "%s/%s", st->channel, st->name);
6976 strid = cstr_to_hexstr (tmp);
6979 format = cstr_to_hexstr (st->format);
6981 sprintf (packet, "m%s:%s:%s",
6982 paddress ((uintptr_t) st->location),
6990 /* Return the first static tracepoint, and initialize the state
6991 machine that will iterate through all the static tracepoints. */
6994 cmd_qtfstm (char *packet)
6996 trace_debug ("Returning first trace state variable definition");
6998 if (first_marker ())
6999 response_ust_marker (packet, first_marker ());
7001 strcpy (packet, "l");
7004 /* Return additional trace state variable definitions. */
7007 cmd_qtsstm (char *packet)
7009 trace_debug ("Returning static tracepoint");
7012 response_ust_marker (packet, next_st);
7014 strcpy (packet, "l");
7017 /* Disconnect the GDB probe from a marker at a given address. */
7020 unprobe_marker_at (char *packet)
7024 struct marker_iter iter;
7026 p += sizeof ("unprobe_marker_at:") - 1;
7028 p = unpack_varlen_hex (p, &address);
7030 USTF(marker_iter_reset) (&iter);
7031 USTF(marker_iter_start) (&iter);
7032 for (; iter.marker != NULL; USTF(marker_iter_next) (&iter))
7033 if ((uintptr_t ) iter.marker->location == address)
7037 result = USTF(ltt_marker_disconnect) (iter.marker->channel,
7041 warning ("could not disable marker %s/%s",
7042 iter.marker->channel, iter.marker->name);
7047 /* Connect the GDB probe to a marker at a given address. */
7050 probe_marker_at (char *packet)
7054 struct marker_iter iter;
7057 p += sizeof ("probe_marker_at:") - 1;
7059 p = unpack_varlen_hex (p, &address);
7061 USTF(marker_iter_reset) (&iter);
7063 for (USTF(marker_iter_start) (&iter), m = iter.marker;
7065 USTF(marker_iter_next) (&iter), m = iter.marker)
7066 if ((uintptr_t ) m->location == address)
7070 trace_debug ("found marker for address. "
7071 "ltt_marker_connect (marker = %s/%s)",
7072 m->channel, m->name);
7074 result = USTF(ltt_marker_connect) (m->channel, m->name,
7076 if (result && result != -EEXIST)
7077 trace_debug ("ltt_marker_connect (marker = %s/%s, errno = %d)",
7078 m->channel, m->name, -result);
7082 sprintf (packet, "E.could not connect marker: channel=%s, name=%s",
7083 m->channel, m->name);
7087 strcpy (packet, "OK");
7091 sprintf (packet, "E.no marker found at 0x%s", paddress (address));
7096 cmd_qtstmat (char *packet)
7100 struct marker_iter iter;
7103 p += sizeof ("qTSTMat:") - 1;
7105 p = unpack_varlen_hex (p, &address);
7107 USTF(marker_iter_reset) (&iter);
7109 for (USTF(marker_iter_start) (&iter), m = iter.marker;
7111 USTF(marker_iter_next) (&iter), m = iter.marker)
7112 if ((uintptr_t ) m->location == address)
7114 response_ust_marker (packet, m);
7118 strcpy (packet, "l");
7128 USTF(ltt_probe_register) (&gdb_ust_probe);
7131 #endif /* HAVE_UST */
7133 #include <sys/syscall.h>
7136 gdb_agent_remove_socket (void)
7138 unlink (agent_socket_name);
7141 /* Helper thread of agent. */
7144 gdb_agent_helper_thread (void *arg)
7148 atexit (gdb_agent_remove_socket);
7152 listen_fd = gdb_agent_socket_init ();
7154 if (helper_thread_id == 0)
7155 helper_thread_id = syscall (SYS_gettid);
7157 if (listen_fd == -1)
7159 warning ("could not create sync socket\n");
7166 struct sockaddr_un sockaddr;
7172 tmp = sizeof (sockaddr);
7176 fd = accept (listen_fd, (struct sockaddr *) &sockaddr, &tmp);
7178 /* It seems an ERESTARTSYS can escape out of accept. */
7179 while (fd == -512 || (fd == -1 && errno == EINTR));
7183 warning ("Accept returned %d, error: %s\n",
7184 fd, strerror (errno));
7190 ret = read (fd, buf, 1);
7191 } while (ret == -1 && errno == EINTR);
7195 warning ("reading socket (fd=%d) failed with %s",
7196 fd, strerror (errno));
7203 if (startswith (cmd_buf, "close"))
7208 else if (strcmp ("qTfSTM", cmd_buf) == 0)
7210 cmd_qtfstm (cmd_buf);
7212 else if (strcmp ("qTsSTM", cmd_buf) == 0)
7214 cmd_qtsstm (cmd_buf);
7216 else if (startswith (cmd_buf, "unprobe_marker_at:"))
7218 unprobe_marker_at (cmd_buf);
7220 else if (startswith (cmd_buf, "probe_marker_at:"))
7222 probe_marker_at (cmd_buf);
7224 else if (startswith (cmd_buf, "qTSTMat:"))
7226 cmd_qtstmat (cmd_buf);
7228 #endif /* HAVE_UST */
7231 /* Fix compiler's warning: ignoring return value of 'write'. */
7232 ret = write (fd, buf, 1);
7238 unlink (agent_socket_name);
7240 /* Sleep endlessly to wait the whole inferior stops. This
7241 thread can not exit because GDB or GDBserver may still need
7242 'current_thread' (representing this thread) to access
7243 inferior memory. Otherwise, this thread exits earlier than
7244 other threads, and 'current_thread' is set to NULL. */
7255 #include <pthread.h>
7258 IP_AGENT_EXPORT_VAR int gdb_agent_capability = AGENT_CAPA_STATIC_TRACE;
7262 gdb_agent_init (void)
7269 /* We want the helper thread to be as transparent as possible, so
7270 have it inherit an all-signals-blocked mask. */
7272 sigfillset (&new_mask);
7273 res = pthread_sigmask (SIG_SETMASK, &new_mask, &orig_mask);
7275 perror_with_name ("pthread_sigmask (1)");
7277 res = pthread_create (&thread,
7279 gdb_agent_helper_thread,
7282 res = pthread_sigmask (SIG_SETMASK, &orig_mask, NULL);
7284 perror_with_name ("pthread_sigmask (2)");
7286 while (helper_thread_id == 0)
7294 #include <sys/mman.h>
7297 IP_AGENT_EXPORT_VAR char *gdb_tp_heap_buffer;
7298 IP_AGENT_EXPORT_VAR char *gdb_jump_pad_buffer;
7299 IP_AGENT_EXPORT_VAR char *gdb_jump_pad_buffer_end;
7300 IP_AGENT_EXPORT_VAR char *gdb_trampoline_buffer;
7301 IP_AGENT_EXPORT_VAR char *gdb_trampoline_buffer_end;
7302 IP_AGENT_EXPORT_VAR char *gdb_trampoline_buffer_error;
7304 /* Record the result of getting buffer space for fast tracepoint
7305 trampolines. Any error message is copied, since caller may not be
7306 using persistent storage. */
7309 set_trampoline_buffer_space (CORE_ADDR begin, CORE_ADDR end, char *errmsg)
7311 gdb_trampoline_buffer = (char *) (uintptr_t) begin;
7312 gdb_trampoline_buffer_end = (char *) (uintptr_t) end;
7314 strncpy (gdb_trampoline_buffer_error, errmsg, 99);
7316 strcpy (gdb_trampoline_buffer_error, "no buffer passed");
7319 static void __attribute__ ((constructor))
7320 initialize_tracepoint_ftlib (void)
7322 initialize_tracepoint ();
7327 #endif /* IN_PROCESS_AGENT */
7329 /* Return a timestamp, expressed as microseconds of the usual Unix
7330 time. (As the result is a 64-bit number, it will not overflow any
7334 get_timestamp (void)
7338 if (gettimeofday (&tv, 0) != 0)
7341 return (LONGEST) tv.tv_sec * 1000000 + tv.tv_usec;
7345 initialize_tracepoint (void)
7347 /* Start with the default size. */
7348 init_trace_buffer (DEFAULT_TRACE_BUFFER_SIZE);
7350 /* Wire trace state variable 1 to be the timestamp. This will be
7351 uploaded to GDB upon connection and become one of its trace state
7352 variables. (In case you're wondering, if GDB already has a trace
7353 variable numbered 1, it will be renumbered.) */
7354 create_trace_state_variable (1, 0);
7355 set_trace_state_variable_name (1, "trace_timestamp");
7356 set_trace_state_variable_getter (1, get_timestamp);
7358 #ifdef IN_PROCESS_AGENT
7363 pagesize = sysconf (_SC_PAGE_SIZE);
7365 perror_with_name ("sysconf");
7367 gdb_tp_heap_buffer = (char *) xmalloc (5 * 1024 * 1024);
7369 #define SCRATCH_BUFFER_NPAGES 20
7371 /* Allocate scratch buffer aligned on a page boundary, at a low
7372 address (close to the main executable's code). */
7373 for (addr = pagesize; addr != 0; addr += pagesize)
7376 = (char *) mmap ((void *) addr,
7377 pagesize * SCRATCH_BUFFER_NPAGES,
7378 PROT_READ | PROT_WRITE | PROT_EXEC,
7379 MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
7381 if (gdb_jump_pad_buffer != MAP_FAILED)
7386 perror_with_name ("mmap");
7388 gdb_jump_pad_buffer_end = gdb_jump_pad_buffer + pagesize * SCRATCH_BUFFER_NPAGES;
7391 gdb_trampoline_buffer = gdb_trampoline_buffer_end = 0;
7393 /* It's not a fatal error for something to go wrong with trampoline
7394 buffer setup, but it can be mysterious, so create a channel to
7395 report back on what went wrong, using a fixed size since we may
7396 not be able to allocate space later when the problem occurs. */
7397 gdb_trampoline_buffer_error = (char *) xmalloc (IPA_BUFSIZ);
7399 strcpy (gdb_trampoline_buffer_error, "No errors reported");
7401 initialize_low_tracepoint ();