1 /* Target-dependent code for the HP PA architecture, for GDB.
3 Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
4 1996, 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
6 Contributed by the Center for Software Science at the
7 University of Utah (pa-gdb-bugs@cs.utah.edu).
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 59 Temple Place - Suite 330,
24 Boston, MA 02111-1307, USA. */
32 #include "completer.h"
35 #include "gdb_assert.h"
36 #include "infttrace.h"
37 /* For argument passing to the inferior */
41 #include <sys/types.h>
45 #include <sys/param.h>
48 #include <sys/ptrace.h>
49 #include <machine/save_state.h>
51 #ifdef COFF_ENCAPSULATE
52 #include "a.out.encap.h"
56 /*#include <sys/user.h> After a.out.h */
67 /* Some local constants. */
68 static const int hppa_num_regs = 128;
70 /* To support detection of the pseudo-initial frame
72 #define THREAD_INITIAL_FRAME_SYMBOL "__pthread_exit"
73 #define THREAD_INITIAL_FRAME_SYM_LEN sizeof(THREAD_INITIAL_FRAME_SYMBOL)
75 static int extract_5_load (unsigned int);
77 static unsigned extract_5R_store (unsigned int);
79 static unsigned extract_5r_store (unsigned int);
81 static void find_dummy_frame_regs (struct frame_info *,
82 struct frame_saved_regs *);
84 static int find_proc_framesize (CORE_ADDR);
86 static int find_return_regnum (CORE_ADDR);
88 struct unwind_table_entry *find_unwind_entry (CORE_ADDR);
90 static int extract_17 (unsigned int);
92 static unsigned deposit_21 (unsigned int, unsigned int);
94 static int extract_21 (unsigned);
96 static unsigned deposit_14 (int, unsigned int);
98 static int extract_14 (unsigned);
100 static void unwind_command (char *, int);
102 static int low_sign_extend (unsigned int, unsigned int);
104 static int sign_extend (unsigned int, unsigned int);
106 static int restore_pc_queue (struct frame_saved_regs *);
108 static int hppa_alignof (struct type *);
110 /* To support multi-threading and stepping. */
111 int hppa_prepare_to_proceed ();
113 static int prologue_inst_adjust_sp (unsigned long);
115 static int is_branch (unsigned long);
117 static int inst_saves_gr (unsigned long);
119 static int inst_saves_fr (unsigned long);
121 static int pc_in_interrupt_handler (CORE_ADDR);
123 static int pc_in_linker_stub (CORE_ADDR);
125 static int compare_unwind_entries (const void *, const void *);
127 static void read_unwind_info (struct objfile *);
129 static void internalize_unwinds (struct objfile *,
130 struct unwind_table_entry *,
131 asection *, unsigned int,
132 unsigned int, CORE_ADDR);
133 static void pa_print_registers (char *, int, int);
134 static void pa_strcat_registers (char *, int, int, struct ui_file *);
135 static void pa_register_look_aside (char *, int, long *);
136 static void pa_print_fp_reg (int);
137 static void pa_strcat_fp_reg (int, struct ui_file *, enum precision_type);
138 static void record_text_segment_lowaddr (bfd *, asection *, void *);
139 /* FIXME: brobecker 2002-11-07: We will likely be able to make the
140 following functions static, once we hppa is partially multiarched. */
141 int hppa_reg_struct_has_addr (int gcc_p, struct type *type);
142 CORE_ADDR hppa_skip_prologue (CORE_ADDR pc);
143 CORE_ADDR hppa_skip_trampoline_code (CORE_ADDR pc);
144 int hppa_in_solib_call_trampoline (CORE_ADDR pc, char *name);
145 int hppa_in_solib_return_trampoline (CORE_ADDR pc, char *name);
146 CORE_ADDR hppa_saved_pc_after_call (struct frame_info *frame);
147 int hppa_inner_than (CORE_ADDR lhs, CORE_ADDR rhs);
148 CORE_ADDR hppa_stack_align (CORE_ADDR sp);
149 int hppa_pc_requires_run_before_use (CORE_ADDR pc);
150 int hppa_instruction_nullified (void);
151 int hppa_register_raw_size (int reg_nr);
152 int hppa_register_byte (int reg_nr);
153 struct type * hppa_register_virtual_type (int reg_nr);
154 void hppa_store_struct_return (CORE_ADDR addr, CORE_ADDR sp);
155 void hppa_extract_return_value (struct type *type, char *regbuf, char *valbuf);
156 int hppa_use_struct_convention (int gcc_p, struct type *type);
157 void hppa_store_return_value (struct type *type, char *valbuf);
158 CORE_ADDR hppa_extract_struct_value_address (char *regbuf);
159 int hppa_cannot_store_register (int regnum);
160 void hppa_init_extra_frame_info (int fromleaf, struct frame_info *frame);
161 CORE_ADDR hppa_frame_chain (struct frame_info *frame);
162 int hppa_frame_chain_valid (CORE_ADDR chain, struct frame_info *thisframe);
163 int hppa_frameless_function_invocation (struct frame_info *frame);
164 CORE_ADDR hppa_frame_saved_pc (struct frame_info *frame);
165 CORE_ADDR hppa_frame_args_address (struct frame_info *fi);
166 CORE_ADDR hppa_frame_locals_address (struct frame_info *fi);
167 int hppa_frame_num_args (struct frame_info *frame);
168 void hppa_push_dummy_frame (void);
169 void hppa_pop_frame (void);
170 CORE_ADDR hppa_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun,
171 int nargs, struct value **args,
172 struct type *type, int gcc_p);
173 CORE_ADDR hppa_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
174 int struct_return, CORE_ADDR struct_addr);
175 CORE_ADDR hppa_smash_text_address (CORE_ADDR addr);
176 CORE_ADDR hppa_target_read_pc (ptid_t ptid);
177 void hppa_target_write_pc (CORE_ADDR v, ptid_t ptid);
178 CORE_ADDR hppa_target_read_fp (void);
182 struct minimal_symbol *msym;
183 CORE_ADDR solib_handle;
184 CORE_ADDR return_val;
188 static int cover_find_stub_with_shl_get (void *);
190 static int is_pa_2 = 0; /* False */
192 /* This is declared in symtab.c; set to 1 in hp-symtab-read.c */
193 extern int hp_som_som_object_present;
195 /* In breakpoint.c */
196 extern int exception_catchpoints_are_fragile;
198 /* Should call_function allocate stack space for a struct return? */
201 hppa_use_struct_convention (int gcc_p, struct type *type)
203 return (TYPE_LENGTH (type) > 2 * REGISTER_SIZE);
207 /* Routines to extract various sized constants out of hppa
210 /* This assumes that no garbage lies outside of the lower bits of
214 sign_extend (unsigned val, unsigned bits)
216 return (int) (val >> (bits - 1) ? (-1 << bits) | val : val);
219 /* For many immediate values the sign bit is the low bit! */
222 low_sign_extend (unsigned val, unsigned bits)
224 return (int) ((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1);
227 /* extract the immediate field from a ld{bhw}s instruction */
230 extract_5_load (unsigned word)
232 return low_sign_extend (word >> 16 & MASK_5, 5);
235 /* extract the immediate field from a break instruction */
238 extract_5r_store (unsigned word)
240 return (word & MASK_5);
243 /* extract the immediate field from a {sr}sm instruction */
246 extract_5R_store (unsigned word)
248 return (word >> 16 & MASK_5);
251 /* extract a 14 bit immediate field */
254 extract_14 (unsigned word)
256 return low_sign_extend (word & MASK_14, 14);
259 /* deposit a 14 bit constant in a word */
262 deposit_14 (int opnd, unsigned word)
264 unsigned sign = (opnd < 0 ? 1 : 0);
266 return word | ((unsigned) opnd << 1 & MASK_14) | sign;
269 /* extract a 21 bit constant */
272 extract_21 (unsigned word)
278 val = GET_FIELD (word, 20, 20);
280 val |= GET_FIELD (word, 9, 19);
282 val |= GET_FIELD (word, 5, 6);
284 val |= GET_FIELD (word, 0, 4);
286 val |= GET_FIELD (word, 7, 8);
287 return sign_extend (val, 21) << 11;
290 /* deposit a 21 bit constant in a word. Although 21 bit constants are
291 usually the top 21 bits of a 32 bit constant, we assume that only
292 the low 21 bits of opnd are relevant */
295 deposit_21 (unsigned opnd, unsigned word)
299 val |= GET_FIELD (opnd, 11 + 14, 11 + 18);
301 val |= GET_FIELD (opnd, 11 + 12, 11 + 13);
303 val |= GET_FIELD (opnd, 11 + 19, 11 + 20);
305 val |= GET_FIELD (opnd, 11 + 1, 11 + 11);
307 val |= GET_FIELD (opnd, 11 + 0, 11 + 0);
311 /* extract a 17 bit constant from branch instructions, returning the
312 19 bit signed value. */
315 extract_17 (unsigned word)
317 return sign_extend (GET_FIELD (word, 19, 28) |
318 GET_FIELD (word, 29, 29) << 10 |
319 GET_FIELD (word, 11, 15) << 11 |
320 (word & 0x1) << 16, 17) << 2;
324 /* Compare the start address for two unwind entries returning 1 if
325 the first address is larger than the second, -1 if the second is
326 larger than the first, and zero if they are equal. */
329 compare_unwind_entries (const void *arg1, const void *arg2)
331 const struct unwind_table_entry *a = arg1;
332 const struct unwind_table_entry *b = arg2;
334 if (a->region_start > b->region_start)
336 else if (a->region_start < b->region_start)
342 static CORE_ADDR low_text_segment_address;
345 record_text_segment_lowaddr (bfd *abfd, asection *section, void *ignored)
347 if (((section->flags & (SEC_ALLOC | SEC_LOAD | SEC_READONLY))
348 == (SEC_ALLOC | SEC_LOAD | SEC_READONLY))
349 && section->vma < low_text_segment_address)
350 low_text_segment_address = section->vma;
354 internalize_unwinds (struct objfile *objfile, struct unwind_table_entry *table,
355 asection *section, unsigned int entries, unsigned int size,
356 CORE_ADDR text_offset)
358 /* We will read the unwind entries into temporary memory, then
359 fill in the actual unwind table. */
364 char *buf = alloca (size);
366 low_text_segment_address = -1;
368 /* If addresses are 64 bits wide, then unwinds are supposed to
369 be segment relative offsets instead of absolute addresses.
371 Note that when loading a shared library (text_offset != 0) the
372 unwinds are already relative to the text_offset that will be
374 if (TARGET_PTR_BIT == 64 && text_offset == 0)
376 bfd_map_over_sections (objfile->obfd,
377 record_text_segment_lowaddr, NULL);
379 /* ?!? Mask off some low bits. Should this instead subtract
380 out the lowest section's filepos or something like that?
381 This looks very hokey to me. */
382 low_text_segment_address &= ~0xfff;
383 text_offset += low_text_segment_address;
386 bfd_get_section_contents (objfile->obfd, section, buf, 0, size);
388 /* Now internalize the information being careful to handle host/target
390 for (i = 0; i < entries; i++)
392 table[i].region_start = bfd_get_32 (objfile->obfd,
394 table[i].region_start += text_offset;
396 table[i].region_end = bfd_get_32 (objfile->obfd, (bfd_byte *) buf);
397 table[i].region_end += text_offset;
399 tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf);
401 table[i].Cannot_unwind = (tmp >> 31) & 0x1;
402 table[i].Millicode = (tmp >> 30) & 0x1;
403 table[i].Millicode_save_sr0 = (tmp >> 29) & 0x1;
404 table[i].Region_description = (tmp >> 27) & 0x3;
405 table[i].reserved1 = (tmp >> 26) & 0x1;
406 table[i].Entry_SR = (tmp >> 25) & 0x1;
407 table[i].Entry_FR = (tmp >> 21) & 0xf;
408 table[i].Entry_GR = (tmp >> 16) & 0x1f;
409 table[i].Args_stored = (tmp >> 15) & 0x1;
410 table[i].Variable_Frame = (tmp >> 14) & 0x1;
411 table[i].Separate_Package_Body = (tmp >> 13) & 0x1;
412 table[i].Frame_Extension_Millicode = (tmp >> 12) & 0x1;
413 table[i].Stack_Overflow_Check = (tmp >> 11) & 0x1;
414 table[i].Two_Instruction_SP_Increment = (tmp >> 10) & 0x1;
415 table[i].Ada_Region = (tmp >> 9) & 0x1;
416 table[i].cxx_info = (tmp >> 8) & 0x1;
417 table[i].cxx_try_catch = (tmp >> 7) & 0x1;
418 table[i].sched_entry_seq = (tmp >> 6) & 0x1;
419 table[i].reserved2 = (tmp >> 5) & 0x1;
420 table[i].Save_SP = (tmp >> 4) & 0x1;
421 table[i].Save_RP = (tmp >> 3) & 0x1;
422 table[i].Save_MRP_in_frame = (tmp >> 2) & 0x1;
423 table[i].extn_ptr_defined = (tmp >> 1) & 0x1;
424 table[i].Cleanup_defined = tmp & 0x1;
425 tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf);
427 table[i].MPE_XL_interrupt_marker = (tmp >> 31) & 0x1;
428 table[i].HP_UX_interrupt_marker = (tmp >> 30) & 0x1;
429 table[i].Large_frame = (tmp >> 29) & 0x1;
430 table[i].Pseudo_SP_Set = (tmp >> 28) & 0x1;
431 table[i].reserved4 = (tmp >> 27) & 0x1;
432 table[i].Total_frame_size = tmp & 0x7ffffff;
434 /* Stub unwinds are handled elsewhere. */
435 table[i].stub_unwind.stub_type = 0;
436 table[i].stub_unwind.padding = 0;
441 /* Read in the backtrace information stored in the `$UNWIND_START$' section of
442 the object file. This info is used mainly by find_unwind_entry() to find
443 out the stack frame size and frame pointer used by procedures. We put
444 everything on the psymbol obstack in the objfile so that it automatically
445 gets freed when the objfile is destroyed. */
448 read_unwind_info (struct objfile *objfile)
450 asection *unwind_sec, *stub_unwind_sec;
451 unsigned unwind_size, stub_unwind_size, total_size;
452 unsigned index, unwind_entries;
453 unsigned stub_entries, total_entries;
454 CORE_ADDR text_offset;
455 struct obj_unwind_info *ui;
456 obj_private_data_t *obj_private;
458 text_offset = ANOFFSET (objfile->section_offsets, 0);
459 ui = (struct obj_unwind_info *) obstack_alloc (&objfile->psymbol_obstack,
460 sizeof (struct obj_unwind_info));
466 /* For reasons unknown the HP PA64 tools generate multiple unwinder
467 sections in a single executable. So we just iterate over every
468 section in the BFD looking for unwinder sections intead of trying
469 to do a lookup with bfd_get_section_by_name.
471 First determine the total size of the unwind tables so that we
472 can allocate memory in a nice big hunk. */
474 for (unwind_sec = objfile->obfd->sections;
476 unwind_sec = unwind_sec->next)
478 if (strcmp (unwind_sec->name, "$UNWIND_START$") == 0
479 || strcmp (unwind_sec->name, ".PARISC.unwind") == 0)
481 unwind_size = bfd_section_size (objfile->obfd, unwind_sec);
482 unwind_entries = unwind_size / UNWIND_ENTRY_SIZE;
484 total_entries += unwind_entries;
488 /* Now compute the size of the stub unwinds. Note the ELF tools do not
489 use stub unwinds at the curren time. */
490 stub_unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_END$");
494 stub_unwind_size = bfd_section_size (objfile->obfd, stub_unwind_sec);
495 stub_entries = stub_unwind_size / STUB_UNWIND_ENTRY_SIZE;
499 stub_unwind_size = 0;
503 /* Compute total number of unwind entries and their total size. */
504 total_entries += stub_entries;
505 total_size = total_entries * sizeof (struct unwind_table_entry);
507 /* Allocate memory for the unwind table. */
508 ui->table = (struct unwind_table_entry *)
509 obstack_alloc (&objfile->psymbol_obstack, total_size);
510 ui->last = total_entries - 1;
512 /* Now read in each unwind section and internalize the standard unwind
515 for (unwind_sec = objfile->obfd->sections;
517 unwind_sec = unwind_sec->next)
519 if (strcmp (unwind_sec->name, "$UNWIND_START$") == 0
520 || strcmp (unwind_sec->name, ".PARISC.unwind") == 0)
522 unwind_size = bfd_section_size (objfile->obfd, unwind_sec);
523 unwind_entries = unwind_size / UNWIND_ENTRY_SIZE;
525 internalize_unwinds (objfile, &ui->table[index], unwind_sec,
526 unwind_entries, unwind_size, text_offset);
527 index += unwind_entries;
531 /* Now read in and internalize the stub unwind entries. */
532 if (stub_unwind_size > 0)
535 char *buf = alloca (stub_unwind_size);
537 /* Read in the stub unwind entries. */
538 bfd_get_section_contents (objfile->obfd, stub_unwind_sec, buf,
539 0, stub_unwind_size);
541 /* Now convert them into regular unwind entries. */
542 for (i = 0; i < stub_entries; i++, index++)
544 /* Clear out the next unwind entry. */
545 memset (&ui->table[index], 0, sizeof (struct unwind_table_entry));
547 /* Convert offset & size into region_start and region_end.
548 Stuff away the stub type into "reserved" fields. */
549 ui->table[index].region_start = bfd_get_32 (objfile->obfd,
551 ui->table[index].region_start += text_offset;
553 ui->table[index].stub_unwind.stub_type = bfd_get_8 (objfile->obfd,
556 ui->table[index].region_end
557 = ui->table[index].region_start + 4 *
558 (bfd_get_16 (objfile->obfd, (bfd_byte *) buf) - 1);
564 /* Unwind table needs to be kept sorted. */
565 qsort (ui->table, total_entries, sizeof (struct unwind_table_entry),
566 compare_unwind_entries);
568 /* Keep a pointer to the unwind information. */
569 if (objfile->obj_private == NULL)
571 obj_private = (obj_private_data_t *)
572 obstack_alloc (&objfile->psymbol_obstack,
573 sizeof (obj_private_data_t));
574 obj_private->unwind_info = NULL;
575 obj_private->so_info = NULL;
578 objfile->obj_private = obj_private;
580 obj_private = (obj_private_data_t *) objfile->obj_private;
581 obj_private->unwind_info = ui;
584 /* Lookup the unwind (stack backtrace) info for the given PC. We search all
585 of the objfiles seeking the unwind table entry for this PC. Each objfile
586 contains a sorted list of struct unwind_table_entry. Since we do a binary
587 search of the unwind tables, we depend upon them to be sorted. */
589 struct unwind_table_entry *
590 find_unwind_entry (CORE_ADDR pc)
592 int first, middle, last;
593 struct objfile *objfile;
595 /* A function at address 0? Not in HP-UX! */
596 if (pc == (CORE_ADDR) 0)
599 ALL_OBJFILES (objfile)
601 struct obj_unwind_info *ui;
603 if (objfile->obj_private)
604 ui = ((obj_private_data_t *) (objfile->obj_private))->unwind_info;
608 read_unwind_info (objfile);
609 if (objfile->obj_private == NULL)
610 error ("Internal error reading unwind information.");
611 ui = ((obj_private_data_t *) (objfile->obj_private))->unwind_info;
614 /* First, check the cache */
617 && pc >= ui->cache->region_start
618 && pc <= ui->cache->region_end)
621 /* Not in the cache, do a binary search */
626 while (first <= last)
628 middle = (first + last) / 2;
629 if (pc >= ui->table[middle].region_start
630 && pc <= ui->table[middle].region_end)
632 ui->cache = &ui->table[middle];
633 return &ui->table[middle];
636 if (pc < ui->table[middle].region_start)
641 } /* ALL_OBJFILES() */
645 /* Return the adjustment necessary to make for addresses on the stack
646 as presented by hpread.c.
648 This is necessary because of the stack direction on the PA and the
649 bizarre way in which someone (?) decided they wanted to handle
650 frame pointerless code in GDB. */
652 hpread_adjust_stack_address (CORE_ADDR func_addr)
654 struct unwind_table_entry *u;
656 u = find_unwind_entry (func_addr);
660 return u->Total_frame_size << 3;
663 /* Called to determine if PC is in an interrupt handler of some
667 pc_in_interrupt_handler (CORE_ADDR pc)
669 struct unwind_table_entry *u;
670 struct minimal_symbol *msym_us;
672 u = find_unwind_entry (pc);
676 /* Oh joys. HPUX sets the interrupt bit for _sigreturn even though
677 its frame isn't a pure interrupt frame. Deal with this. */
678 msym_us = lookup_minimal_symbol_by_pc (pc);
680 return (u->HP_UX_interrupt_marker
681 && !PC_IN_SIGTRAMP (pc, DEPRECATED_SYMBOL_NAME (msym_us)));
684 /* Called when no unwind descriptor was found for PC. Returns 1 if it
685 appears that PC is in a linker stub.
687 ?!? Need to handle stubs which appear in PA64 code. */
690 pc_in_linker_stub (CORE_ADDR pc)
692 int found_magic_instruction = 0;
696 /* If unable to read memory, assume pc is not in a linker stub. */
697 if (target_read_memory (pc, buf, 4) != 0)
700 /* We are looking for something like
702 ; $$dyncall jams RP into this special spot in the frame (RP')
703 ; before calling the "call stub"
706 ldsid (rp),r1 ; Get space associated with RP into r1
707 mtsp r1,sp ; Move it into space register 0
708 be,n 0(sr0),rp) ; back to your regularly scheduled program */
710 /* Maximum known linker stub size is 4 instructions. Search forward
711 from the given PC, then backward. */
712 for (i = 0; i < 4; i++)
714 /* If we hit something with an unwind, stop searching this direction. */
716 if (find_unwind_entry (pc + i * 4) != 0)
719 /* Check for ldsid (rp),r1 which is the magic instruction for a
720 return from a cross-space function call. */
721 if (read_memory_integer (pc + i * 4, 4) == 0x004010a1)
723 found_magic_instruction = 1;
726 /* Add code to handle long call/branch and argument relocation stubs
730 if (found_magic_instruction != 0)
733 /* Now look backward. */
734 for (i = 0; i < 4; i++)
736 /* If we hit something with an unwind, stop searching this direction. */
738 if (find_unwind_entry (pc - i * 4) != 0)
741 /* Check for ldsid (rp),r1 which is the magic instruction for a
742 return from a cross-space function call. */
743 if (read_memory_integer (pc - i * 4, 4) == 0x004010a1)
745 found_magic_instruction = 1;
748 /* Add code to handle long call/branch and argument relocation stubs
751 return found_magic_instruction;
755 find_return_regnum (CORE_ADDR pc)
757 struct unwind_table_entry *u;
759 u = find_unwind_entry (pc);
770 /* Return size of frame, or -1 if we should use a frame pointer. */
772 find_proc_framesize (CORE_ADDR pc)
774 struct unwind_table_entry *u;
775 struct minimal_symbol *msym_us;
777 /* This may indicate a bug in our callers... */
778 if (pc == (CORE_ADDR) 0)
781 u = find_unwind_entry (pc);
785 if (pc_in_linker_stub (pc))
786 /* Linker stubs have a zero size frame. */
792 msym_us = lookup_minimal_symbol_by_pc (pc);
794 /* If Save_SP is set, and we're not in an interrupt or signal caller,
795 then we have a frame pointer. Use it. */
797 && !pc_in_interrupt_handler (pc)
799 && !PC_IN_SIGTRAMP (pc, DEPRECATED_SYMBOL_NAME (msym_us)))
802 return u->Total_frame_size << 3;
805 /* Return offset from sp at which rp is saved, or 0 if not saved. */
806 static int rp_saved (CORE_ADDR);
809 rp_saved (CORE_ADDR pc)
811 struct unwind_table_entry *u;
813 /* A function at, and thus a return PC from, address 0? Not in HP-UX! */
814 if (pc == (CORE_ADDR) 0)
817 u = find_unwind_entry (pc);
821 if (pc_in_linker_stub (pc))
822 /* This is the so-called RP'. */
829 return (TARGET_PTR_BIT == 64 ? -16 : -20);
830 else if (u->stub_unwind.stub_type != 0)
832 switch (u->stub_unwind.stub_type)
837 case PARAMETER_RELOCATION:
848 hppa_frameless_function_invocation (struct frame_info *frame)
850 struct unwind_table_entry *u;
852 u = find_unwind_entry (frame->pc);
857 return (u->Total_frame_size == 0 && u->stub_unwind.stub_type == 0);
860 /* Immediately after a function call, return the saved pc.
861 Can't go through the frames for this because on some machines
862 the new frame is not set up until the new function executes
863 some instructions. */
866 hppa_saved_pc_after_call (struct frame_info *frame)
870 struct unwind_table_entry *u;
872 ret_regnum = find_return_regnum (get_frame_pc (frame));
873 pc = read_register (ret_regnum) & ~0x3;
875 /* If PC is in a linker stub, then we need to dig the address
876 the stub will return to out of the stack. */
877 u = find_unwind_entry (pc);
878 if (u && u->stub_unwind.stub_type != 0)
879 return DEPRECATED_FRAME_SAVED_PC (frame);
885 hppa_frame_saved_pc (struct frame_info *frame)
887 CORE_ADDR pc = get_frame_pc (frame);
888 struct unwind_table_entry *u;
889 CORE_ADDR old_pc = 0;
890 int spun_around_loop = 0;
893 /* BSD, HPUX & OSF1 all lay out the hardware state in the same manner
894 at the base of the frame in an interrupt handler. Registers within
895 are saved in the exact same order as GDB numbers registers. How
897 if (pc_in_interrupt_handler (pc))
898 return read_memory_integer (frame->frame + PC_REGNUM * 4,
899 TARGET_PTR_BIT / 8) & ~0x3;
901 if ((frame->pc >= frame->frame
902 && frame->pc <= (frame->frame
903 /* A call dummy is sized in words, but it is
904 actually a series of instructions. Account
905 for that scaling factor. */
906 + ((REGISTER_SIZE / INSTRUCTION_SIZE)
908 /* Similarly we have to account for 64bit
909 wide register saves. */
910 + (32 * REGISTER_SIZE)
911 /* We always consider FP regs 8 bytes long. */
912 + (NUM_REGS - FP0_REGNUM) * 8
913 /* Similarly we have to account for 64bit
914 wide register saves. */
915 + (6 * REGISTER_SIZE))))
917 return read_memory_integer ((frame->frame
918 + (TARGET_PTR_BIT == 64 ? -16 : -20)),
919 TARGET_PTR_BIT / 8) & ~0x3;
922 #ifdef FRAME_SAVED_PC_IN_SIGTRAMP
923 /* Deal with signal handler caller frames too. */
924 if ((get_frame_type (frame) == SIGTRAMP_FRAME))
927 FRAME_SAVED_PC_IN_SIGTRAMP (frame, &rp);
932 if (hppa_frameless_function_invocation (frame))
936 ret_regnum = find_return_regnum (pc);
938 /* If the next frame is an interrupt frame or a signal
939 handler caller, then we need to look in the saved
940 register area to get the return pointer (the values
941 in the registers may not correspond to anything useful). */
943 && ((get_frame_type (frame->next) == SIGTRAMP_FRAME)
944 || pc_in_interrupt_handler (frame->next->pc)))
946 struct frame_saved_regs saved_regs;
948 deprecated_get_frame_saved_regs (frame->next, &saved_regs);
949 if (read_memory_integer (saved_regs.regs[FLAGS_REGNUM],
950 TARGET_PTR_BIT / 8) & 0x2)
952 pc = read_memory_integer (saved_regs.regs[31],
953 TARGET_PTR_BIT / 8) & ~0x3;
955 /* Syscalls are really two frames. The syscall stub itself
956 with a return pointer in %rp and the kernel call with
957 a return pointer in %r31. We return the %rp variant
958 if %r31 is the same as frame->pc. */
960 pc = read_memory_integer (saved_regs.regs[RP_REGNUM],
961 TARGET_PTR_BIT / 8) & ~0x3;
964 pc = read_memory_integer (saved_regs.regs[RP_REGNUM],
965 TARGET_PTR_BIT / 8) & ~0x3;
968 pc = read_register (ret_regnum) & ~0x3;
972 spun_around_loop = 0;
976 rp_offset = rp_saved (pc);
978 /* Similar to code in frameless function case. If the next
979 frame is a signal or interrupt handler, then dig the right
980 information out of the saved register info. */
983 && ((get_frame_type (frame->next) == SIGTRAMP_FRAME)
984 || pc_in_interrupt_handler (frame->next->pc)))
986 struct frame_saved_regs saved_regs;
988 deprecated_get_frame_saved_regs (frame->next, &saved_regs);
989 if (read_memory_integer (saved_regs.regs[FLAGS_REGNUM],
990 TARGET_PTR_BIT / 8) & 0x2)
992 pc = read_memory_integer (saved_regs.regs[31],
993 TARGET_PTR_BIT / 8) & ~0x3;
995 /* Syscalls are really two frames. The syscall stub itself
996 with a return pointer in %rp and the kernel call with
997 a return pointer in %r31. We return the %rp variant
998 if %r31 is the same as frame->pc. */
1000 pc = read_memory_integer (saved_regs.regs[RP_REGNUM],
1001 TARGET_PTR_BIT / 8) & ~0x3;
1004 pc = read_memory_integer (saved_regs.regs[RP_REGNUM],
1005 TARGET_PTR_BIT / 8) & ~0x3;
1007 else if (rp_offset == 0)
1010 pc = read_register (RP_REGNUM) & ~0x3;
1015 pc = read_memory_integer (frame->frame + rp_offset,
1016 TARGET_PTR_BIT / 8) & ~0x3;
1020 /* If PC is inside a linker stub, then dig out the address the stub
1023 Don't do this for long branch stubs. Why? For some unknown reason
1024 _start is marked as a long branch stub in hpux10. */
1025 u = find_unwind_entry (pc);
1026 if (u && u->stub_unwind.stub_type != 0
1027 && u->stub_unwind.stub_type != LONG_BRANCH)
1031 /* If this is a dynamic executable, and we're in a signal handler,
1032 then the call chain will eventually point us into the stub for
1033 _sigreturn. Unlike most cases, we'll be pointed to the branch
1034 to the real sigreturn rather than the code after the real branch!.
1036 Else, try to dig the address the stub will return to in the normal
1038 insn = read_memory_integer (pc, 4);
1039 if ((insn & 0xfc00e000) == 0xe8000000)
1040 return (pc + extract_17 (insn) + 8) & ~0x3;
1046 if (spun_around_loop > 1)
1048 /* We're just about to go around the loop again with
1049 no more hope of success. Die. */
1050 error ("Unable to find return pc for this frame");
1060 /* We need to correct the PC and the FP for the outermost frame when we are
1061 in a system call. */
1064 hppa_init_extra_frame_info (int fromleaf, struct frame_info *frame)
1069 if (frame->next && !fromleaf)
1072 /* If the next frame represents a frameless function invocation then
1073 we have to do some adjustments that are normally done by
1074 DEPRECATED_FRAME_CHAIN. (DEPRECATED_FRAME_CHAIN is not called in
1078 /* Find the framesize of *this* frame without peeking at the PC
1079 in the current frame structure (it isn't set yet). */
1080 framesize = find_proc_framesize (DEPRECATED_FRAME_SAVED_PC (get_next_frame (frame)));
1082 /* Now adjust our base frame accordingly. If we have a frame pointer
1083 use it, else subtract the size of this frame from the current
1084 frame. (we always want frame->frame to point at the lowest address
1086 if (framesize == -1)
1087 frame->frame = TARGET_READ_FP ();
1089 frame->frame -= framesize;
1093 flags = read_register (FLAGS_REGNUM);
1094 if (flags & 2) /* In system call? */
1095 frame->pc = read_register (31) & ~0x3;
1097 /* The outermost frame is always derived from PC-framesize
1099 One might think frameless innermost frames should have
1100 a frame->frame that is the same as the parent's frame->frame.
1101 That is wrong; frame->frame in that case should be the *high*
1102 address of the parent's frame. It's complicated as hell to
1103 explain, but the parent *always* creates some stack space for
1104 the child. So the child actually does have a frame of some
1105 sorts, and its base is the high address in its parent's frame. */
1106 framesize = find_proc_framesize (frame->pc);
1107 if (framesize == -1)
1108 frame->frame = TARGET_READ_FP ();
1110 frame->frame = read_register (SP_REGNUM) - framesize;
1113 /* Given a GDB frame, determine the address of the calling function's
1114 frame. This will be used to create a new GDB frame struct, and
1115 then DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC
1116 will be called for the new frame.
1118 This may involve searching through prologues for several functions
1119 at boundaries where GCC calls HP C code, or where code which has
1120 a frame pointer calls code without a frame pointer. */
1123 hppa_frame_chain (struct frame_info *frame)
1125 int my_framesize, caller_framesize;
1126 struct unwind_table_entry *u;
1127 CORE_ADDR frame_base;
1128 struct frame_info *tmp_frame;
1130 /* A frame in the current frame list, or zero. */
1131 struct frame_info *saved_regs_frame = 0;
1132 /* Where the registers were saved in saved_regs_frame.
1133 If saved_regs_frame is zero, this is garbage. */
1134 struct frame_saved_regs saved_regs;
1136 CORE_ADDR caller_pc;
1138 struct minimal_symbol *min_frame_symbol;
1139 struct symbol *frame_symbol;
1140 char *frame_symbol_name;
1142 /* If this is a threaded application, and we see the
1143 routine "__pthread_exit", treat it as the stack root
1145 min_frame_symbol = lookup_minimal_symbol_by_pc (frame->pc);
1146 frame_symbol = find_pc_function (frame->pc);
1148 if ((min_frame_symbol != 0) /* && (frame_symbol == 0) */ )
1150 /* The test above for "no user function name" would defend
1151 against the slim likelihood that a user might define a
1152 routine named "__pthread_exit" and then try to debug it.
1154 If it weren't commented out, and you tried to debug the
1155 pthread library itself, you'd get errors.
1157 So for today, we don't make that check. */
1158 frame_symbol_name = DEPRECATED_SYMBOL_NAME (min_frame_symbol);
1159 if (frame_symbol_name != 0)
1161 if (0 == strncmp (frame_symbol_name,
1162 THREAD_INITIAL_FRAME_SYMBOL,
1163 THREAD_INITIAL_FRAME_SYM_LEN))
1165 /* Pretend we've reached the bottom of the stack. */
1166 return (CORE_ADDR) 0;
1169 } /* End of hacky code for threads. */
1171 /* Handle HPUX, BSD, and OSF1 style interrupt frames first. These
1172 are easy; at *sp we have a full save state strucutre which we can
1173 pull the old stack pointer from. Also see frame_saved_pc for
1174 code to dig a saved PC out of the save state structure. */
1175 if (pc_in_interrupt_handler (frame->pc))
1176 frame_base = read_memory_integer (frame->frame + SP_REGNUM * 4,
1177 TARGET_PTR_BIT / 8);
1178 #ifdef FRAME_BASE_BEFORE_SIGTRAMP
1179 else if ((get_frame_type (frame) == SIGTRAMP_FRAME))
1181 FRAME_BASE_BEFORE_SIGTRAMP (frame, &frame_base);
1185 frame_base = frame->frame;
1187 /* Get frame sizes for the current frame and the frame of the
1189 my_framesize = find_proc_framesize (frame->pc);
1190 caller_pc = DEPRECATED_FRAME_SAVED_PC (frame);
1192 /* If we can't determine the caller's PC, then it's not likely we can
1193 really determine anything meaningful about its frame. We'll consider
1194 this to be stack bottom. */
1195 if (caller_pc == (CORE_ADDR) 0)
1196 return (CORE_ADDR) 0;
1198 caller_framesize = find_proc_framesize (DEPRECATED_FRAME_SAVED_PC (frame));
1200 /* If caller does not have a frame pointer, then its frame
1201 can be found at current_frame - caller_framesize. */
1202 if (caller_framesize != -1)
1204 return frame_base - caller_framesize;
1206 /* Both caller and callee have frame pointers and are GCC compiled
1207 (SAVE_SP bit in unwind descriptor is on for both functions.
1208 The previous frame pointer is found at the top of the current frame. */
1209 if (caller_framesize == -1 && my_framesize == -1)
1211 return read_memory_integer (frame_base, TARGET_PTR_BIT / 8);
1213 /* Caller has a frame pointer, but callee does not. This is a little
1214 more difficult as GCC and HP C lay out locals and callee register save
1215 areas very differently.
1217 The previous frame pointer could be in a register, or in one of
1218 several areas on the stack.
1220 Walk from the current frame to the innermost frame examining
1221 unwind descriptors to determine if %r3 ever gets saved into the
1222 stack. If so return whatever value got saved into the stack.
1223 If it was never saved in the stack, then the value in %r3 is still
1226 We use information from unwind descriptors to determine if %r3
1227 is saved into the stack (Entry_GR field has this information). */
1229 for (tmp_frame = frame; tmp_frame; tmp_frame = tmp_frame->next)
1231 u = find_unwind_entry (tmp_frame->pc);
1235 /* We could find this information by examining prologues. I don't
1236 think anyone has actually written any tools (not even "strip")
1237 which leave them out of an executable, so maybe this is a moot
1239 /* ??rehrauer: Actually, it's quite possible to stepi your way into
1240 code that doesn't have unwind entries. For example, stepping into
1241 the dynamic linker will give you a PC that has none. Thus, I've
1242 disabled this warning. */
1244 warning ("Unable to find unwind for PC 0x%x -- Help!", tmp_frame->pc);
1246 return (CORE_ADDR) 0;
1250 || (get_frame_type (tmp_frame) == SIGTRAMP_FRAME)
1251 || pc_in_interrupt_handler (tmp_frame->pc))
1254 /* Entry_GR specifies the number of callee-saved general registers
1255 saved in the stack. It starts at %r3, so %r3 would be 1. */
1256 if (u->Entry_GR >= 1)
1258 /* The unwind entry claims that r3 is saved here. However,
1259 in optimized code, GCC often doesn't actually save r3.
1260 We'll discover this if we look at the prologue. */
1261 deprecated_get_frame_saved_regs (tmp_frame, &saved_regs);
1262 saved_regs_frame = tmp_frame;
1264 /* If we have an address for r3, that's good. */
1265 if (saved_regs.regs[FP_REGNUM])
1272 /* We may have walked down the chain into a function with a frame
1275 && !(get_frame_type (tmp_frame) == SIGTRAMP_FRAME)
1276 && !pc_in_interrupt_handler (tmp_frame->pc))
1278 return read_memory_integer (tmp_frame->frame, TARGET_PTR_BIT / 8);
1280 /* %r3 was saved somewhere in the stack. Dig it out. */
1285 For optimization purposes many kernels don't have the
1286 callee saved registers into the save_state structure upon
1287 entry into the kernel for a syscall; the optimization
1288 is usually turned off if the process is being traced so
1289 that the debugger can get full register state for the
1292 This scheme works well except for two cases:
1294 * Attaching to a process when the process is in the
1295 kernel performing a system call (debugger can't get
1296 full register state for the inferior process since
1297 the process wasn't being traced when it entered the
1300 * Register state is not complete if the system call
1301 causes the process to core dump.
1304 The following heinous code is an attempt to deal with
1305 the lack of register state in a core dump. It will
1306 fail miserably if the function which performs the
1307 system call has a variable sized stack frame. */
1309 if (tmp_frame != saved_regs_frame)
1310 deprecated_get_frame_saved_regs (tmp_frame, &saved_regs);
1312 /* Abominable hack. */
1313 if (current_target.to_has_execution == 0
1314 && ((saved_regs.regs[FLAGS_REGNUM]
1315 && (read_memory_integer (saved_regs.regs[FLAGS_REGNUM],
1318 || (saved_regs.regs[FLAGS_REGNUM] == 0
1319 && read_register (FLAGS_REGNUM) & 0x2)))
1321 u = find_unwind_entry (DEPRECATED_FRAME_SAVED_PC (frame));
1324 return read_memory_integer (saved_regs.regs[FP_REGNUM],
1325 TARGET_PTR_BIT / 8);
1329 return frame_base - (u->Total_frame_size << 3);
1333 return read_memory_integer (saved_regs.regs[FP_REGNUM],
1334 TARGET_PTR_BIT / 8);
1339 /* Get the innermost frame. */
1341 while (tmp_frame->next != NULL)
1342 tmp_frame = tmp_frame->next;
1344 if (tmp_frame != saved_regs_frame)
1345 deprecated_get_frame_saved_regs (tmp_frame, &saved_regs);
1347 /* Abominable hack. See above. */
1348 if (current_target.to_has_execution == 0
1349 && ((saved_regs.regs[FLAGS_REGNUM]
1350 && (read_memory_integer (saved_regs.regs[FLAGS_REGNUM],
1353 || (saved_regs.regs[FLAGS_REGNUM] == 0
1354 && read_register (FLAGS_REGNUM) & 0x2)))
1356 u = find_unwind_entry (DEPRECATED_FRAME_SAVED_PC (frame));
1359 return read_memory_integer (saved_regs.regs[FP_REGNUM],
1360 TARGET_PTR_BIT / 8);
1364 return frame_base - (u->Total_frame_size << 3);
1368 /* The value in %r3 was never saved into the stack (thus %r3 still
1369 holds the value of the previous frame pointer). */
1370 return TARGET_READ_FP ();
1375 /* To see if a frame chain is valid, see if the caller looks like it
1376 was compiled with gcc. */
1379 hppa_frame_chain_valid (CORE_ADDR chain, struct frame_info *thisframe)
1381 struct minimal_symbol *msym_us;
1382 struct minimal_symbol *msym_start;
1383 struct unwind_table_entry *u, *next_u = NULL;
1384 struct frame_info *next;
1386 u = find_unwind_entry (thisframe->pc);
1391 /* We can't just check that the same of msym_us is "_start", because
1392 someone idiotically decided that they were going to make a Ltext_end
1393 symbol with the same address. This Ltext_end symbol is totally
1394 indistinguishable (as nearly as I can tell) from the symbol for a function
1395 which is (legitimately, since it is in the user's namespace)
1396 named Ltext_end, so we can't just ignore it. */
1397 msym_us = lookup_minimal_symbol_by_pc (DEPRECATED_FRAME_SAVED_PC (thisframe));
1398 msym_start = lookup_minimal_symbol ("_start", NULL, NULL);
1401 && SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start))
1404 /* Grrrr. Some new idiot decided that they don't want _start for the
1405 PRO configurations; $START$ calls main directly.... Deal with it. */
1406 msym_start = lookup_minimal_symbol ("$START$", NULL, NULL);
1409 && SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start))
1412 next = get_next_frame (thisframe);
1414 next_u = find_unwind_entry (next->pc);
1416 /* If this frame does not save SP, has no stack, isn't a stub,
1417 and doesn't "call" an interrupt routine or signal handler caller,
1418 then its not valid. */
1419 if (u->Save_SP || u->Total_frame_size || u->stub_unwind.stub_type != 0
1420 || (thisframe->next && (get_frame_type (thisframe->next) == SIGTRAMP_FRAME))
1421 || (next_u && next_u->HP_UX_interrupt_marker))
1424 if (pc_in_linker_stub (thisframe->pc))
1430 /* These functions deal with saving and restoring register state
1431 around a function call in the inferior. They keep the stack
1432 double-word aligned; eventually, on an hp700, the stack will have
1433 to be aligned to a 64-byte boundary. */
1436 hppa_push_dummy_frame (void)
1438 CORE_ADDR sp, pc, pcspace;
1439 register int regnum;
1440 CORE_ADDR int_buffer;
1443 pc = hppa_target_read_pc (inferior_ptid);
1444 int_buffer = read_register (FLAGS_REGNUM);
1445 if (int_buffer & 0x2)
1447 const unsigned int sid = (pc >> 30) & 0x3;
1449 pcspace = read_register (SR4_REGNUM);
1451 pcspace = read_register (SR4_REGNUM + 4 + sid);
1454 pcspace = read_register (PCSQ_HEAD_REGNUM);
1456 /* Space for "arguments"; the RP goes in here. */
1457 sp = read_register (SP_REGNUM) + 48;
1458 int_buffer = read_register (RP_REGNUM) | 0x3;
1460 /* The 32bit and 64bit ABIs save the return pointer into different
1462 if (REGISTER_SIZE == 8)
1463 write_memory (sp - 16, (char *) &int_buffer, REGISTER_SIZE);
1465 write_memory (sp - 20, (char *) &int_buffer, REGISTER_SIZE);
1467 int_buffer = TARGET_READ_FP ();
1468 write_memory (sp, (char *) &int_buffer, REGISTER_SIZE);
1470 write_register (FP_REGNUM, sp);
1472 sp += 2 * REGISTER_SIZE;
1474 for (regnum = 1; regnum < 32; regnum++)
1475 if (regnum != RP_REGNUM && regnum != FP_REGNUM)
1476 sp = push_word (sp, read_register (regnum));
1478 /* This is not necessary for the 64bit ABI. In fact it is dangerous. */
1479 if (REGISTER_SIZE != 8)
1482 for (regnum = FP0_REGNUM; regnum < NUM_REGS; regnum++)
1484 deprecated_read_register_bytes (REGISTER_BYTE (regnum),
1485 (char *) &freg_buffer, 8);
1486 sp = push_bytes (sp, (char *) &freg_buffer, 8);
1488 sp = push_word (sp, read_register (IPSW_REGNUM));
1489 sp = push_word (sp, read_register (SAR_REGNUM));
1490 sp = push_word (sp, pc);
1491 sp = push_word (sp, pcspace);
1492 sp = push_word (sp, pc + 4);
1493 sp = push_word (sp, pcspace);
1494 write_register (SP_REGNUM, sp);
1498 find_dummy_frame_regs (struct frame_info *frame,
1499 struct frame_saved_regs *frame_saved_regs)
1501 CORE_ADDR fp = frame->frame;
1504 /* The 32bit and 64bit ABIs save RP into different locations. */
1505 if (REGISTER_SIZE == 8)
1506 frame_saved_regs->regs[RP_REGNUM] = (fp - 16) & ~0x3;
1508 frame_saved_regs->regs[RP_REGNUM] = (fp - 20) & ~0x3;
1510 frame_saved_regs->regs[FP_REGNUM] = fp;
1512 frame_saved_regs->regs[1] = fp + (2 * REGISTER_SIZE);
1514 for (fp += 3 * REGISTER_SIZE, i = 3; i < 32; i++)
1518 frame_saved_regs->regs[i] = fp;
1519 fp += REGISTER_SIZE;
1523 /* This is not necessary or desirable for the 64bit ABI. */
1524 if (REGISTER_SIZE != 8)
1527 for (i = FP0_REGNUM; i < NUM_REGS; i++, fp += 8)
1528 frame_saved_regs->regs[i] = fp;
1530 frame_saved_regs->regs[IPSW_REGNUM] = fp;
1531 frame_saved_regs->regs[SAR_REGNUM] = fp + REGISTER_SIZE;
1532 frame_saved_regs->regs[PCOQ_HEAD_REGNUM] = fp + 2 * REGISTER_SIZE;
1533 frame_saved_regs->regs[PCSQ_HEAD_REGNUM] = fp + 3 * REGISTER_SIZE;
1534 frame_saved_regs->regs[PCOQ_TAIL_REGNUM] = fp + 4 * REGISTER_SIZE;
1535 frame_saved_regs->regs[PCSQ_TAIL_REGNUM] = fp + 5 * REGISTER_SIZE;
1539 hppa_pop_frame (void)
1541 register struct frame_info *frame = get_current_frame ();
1542 register CORE_ADDR fp, npc, target_pc;
1543 register int regnum;
1544 struct frame_saved_regs fsr;
1547 fp = get_frame_base (frame);
1548 deprecated_get_frame_saved_regs (frame, &fsr);
1550 #ifndef NO_PC_SPACE_QUEUE_RESTORE
1551 if (fsr.regs[IPSW_REGNUM]) /* Restoring a call dummy frame */
1552 restore_pc_queue (&fsr);
1555 for (regnum = 31; regnum > 0; regnum--)
1556 if (fsr.regs[regnum])
1557 write_register (regnum, read_memory_integer (fsr.regs[regnum],
1560 for (regnum = NUM_REGS - 1; regnum >= FP0_REGNUM; regnum--)
1561 if (fsr.regs[regnum])
1563 read_memory (fsr.regs[regnum], (char *) &freg_buffer, 8);
1564 deprecated_write_register_bytes (REGISTER_BYTE (regnum),
1565 (char *) &freg_buffer, 8);
1568 if (fsr.regs[IPSW_REGNUM])
1569 write_register (IPSW_REGNUM,
1570 read_memory_integer (fsr.regs[IPSW_REGNUM],
1573 if (fsr.regs[SAR_REGNUM])
1574 write_register (SAR_REGNUM,
1575 read_memory_integer (fsr.regs[SAR_REGNUM],
1578 /* If the PC was explicitly saved, then just restore it. */
1579 if (fsr.regs[PCOQ_TAIL_REGNUM])
1581 npc = read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM],
1583 write_register (PCOQ_TAIL_REGNUM, npc);
1585 /* Else use the value in %rp to set the new PC. */
1588 npc = read_register (RP_REGNUM);
1592 write_register (FP_REGNUM, read_memory_integer (fp, REGISTER_SIZE));
1594 if (fsr.regs[IPSW_REGNUM]) /* call dummy */
1595 write_register (SP_REGNUM, fp - 48);
1597 write_register (SP_REGNUM, fp);
1599 /* The PC we just restored may be inside a return trampoline. If so
1600 we want to restart the inferior and run it through the trampoline.
1602 Do this by setting a momentary breakpoint at the location the
1603 trampoline returns to.
1605 Don't skip through the trampoline if we're popping a dummy frame. */
1606 target_pc = SKIP_TRAMPOLINE_CODE (npc & ~0x3) & ~0x3;
1607 if (target_pc && !fsr.regs[IPSW_REGNUM])
1609 struct symtab_and_line sal;
1610 struct breakpoint *breakpoint;
1611 struct cleanup *old_chain;
1613 /* Set up our breakpoint. Set it to be silent as the MI code
1614 for "return_command" will print the frame we returned to. */
1615 sal = find_pc_line (target_pc, 0);
1617 breakpoint = set_momentary_breakpoint (sal, null_frame_id, bp_finish);
1618 breakpoint->silent = 1;
1620 /* So we can clean things up. */
1621 old_chain = make_cleanup_delete_breakpoint (breakpoint);
1623 /* Start up the inferior. */
1624 clear_proceed_status ();
1625 proceed_to_finish = 1;
1626 proceed ((CORE_ADDR) -1, TARGET_SIGNAL_DEFAULT, 0);
1628 /* Perform our cleanups. */
1629 do_cleanups (old_chain);
1631 flush_cached_frames ();
1634 /* After returning to a dummy on the stack, restore the instruction
1635 queue space registers. */
1638 restore_pc_queue (struct frame_saved_regs *fsr)
1640 CORE_ADDR pc = read_pc ();
1641 CORE_ADDR new_pc = read_memory_integer (fsr->regs[PCOQ_HEAD_REGNUM],
1642 TARGET_PTR_BIT / 8);
1643 struct target_waitstatus w;
1646 /* Advance past break instruction in the call dummy. */
1647 write_register (PCOQ_HEAD_REGNUM, pc + 4);
1648 write_register (PCOQ_TAIL_REGNUM, pc + 8);
1650 /* HPUX doesn't let us set the space registers or the space
1651 registers of the PC queue through ptrace. Boo, hiss.
1652 Conveniently, the call dummy has this sequence of instructions
1657 So, load up the registers and single step until we are in the
1660 write_register (21, read_memory_integer (fsr->regs[PCSQ_HEAD_REGNUM],
1662 write_register (22, new_pc);
1664 for (insn_count = 0; insn_count < 3; insn_count++)
1666 /* FIXME: What if the inferior gets a signal right now? Want to
1667 merge this into wait_for_inferior (as a special kind of
1668 watchpoint? By setting a breakpoint at the end? Is there
1669 any other choice? Is there *any* way to do this stuff with
1670 ptrace() or some equivalent?). */
1672 target_wait (inferior_ptid, &w);
1674 if (w.kind == TARGET_WAITKIND_SIGNALLED)
1676 stop_signal = w.value.sig;
1677 terminal_ours_for_output ();
1678 printf_unfiltered ("\nProgram terminated with signal %s, %s.\n",
1679 target_signal_to_name (stop_signal),
1680 target_signal_to_string (stop_signal));
1681 gdb_flush (gdb_stdout);
1685 target_terminal_ours ();
1686 target_fetch_registers (-1);
1691 #ifdef PA20W_CALLING_CONVENTIONS
1693 /* This function pushes a stack frame with arguments as part of the
1694 inferior function calling mechanism.
1696 This is the version for the PA64, in which later arguments appear
1697 at higher addresses. (The stack always grows towards higher
1700 We simply allocate the appropriate amount of stack space and put
1701 arguments into their proper slots. The call dummy code will copy
1702 arguments into registers as needed by the ABI.
1704 This ABI also requires that the caller provide an argument pointer
1705 to the callee, so we do that too. */
1708 hppa_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
1709 int struct_return, CORE_ADDR struct_addr)
1711 /* array of arguments' offsets */
1712 int *offset = (int *) alloca (nargs * sizeof (int));
1714 /* array of arguments' lengths: real lengths in bytes, not aligned to
1716 int *lengths = (int *) alloca (nargs * sizeof (int));
1718 /* The value of SP as it was passed into this function after
1720 CORE_ADDR orig_sp = STACK_ALIGN (sp);
1722 /* The number of stack bytes occupied by the current argument. */
1725 /* The total number of bytes reserved for the arguments. */
1726 int cum_bytes_reserved = 0;
1728 /* Similarly, but aligned. */
1729 int cum_bytes_aligned = 0;
1732 /* Iterate over each argument provided by the user. */
1733 for (i = 0; i < nargs; i++)
1735 struct type *arg_type = VALUE_TYPE (args[i]);
1737 /* Integral scalar values smaller than a register are padded on
1738 the left. We do this by promoting them to full-width,
1739 although the ABI says to pad them with garbage. */
1740 if (is_integral_type (arg_type)
1741 && TYPE_LENGTH (arg_type) < REGISTER_SIZE)
1743 args[i] = value_cast ((TYPE_UNSIGNED (arg_type)
1744 ? builtin_type_unsigned_long
1745 : builtin_type_long),
1747 arg_type = VALUE_TYPE (args[i]);
1750 lengths[i] = TYPE_LENGTH (arg_type);
1752 /* Align the size of the argument to the word size for this
1754 bytes_reserved = (lengths[i] + REGISTER_SIZE - 1) & -REGISTER_SIZE;
1756 offset[i] = cum_bytes_reserved;
1758 /* Aggregates larger than eight bytes (the only types larger
1759 than eight bytes we have) are aligned on a 16-byte boundary,
1760 possibly padded on the right with garbage. This may leave an
1761 empty word on the stack, and thus an unused register, as per
1763 if (bytes_reserved > 8)
1765 /* Round up the offset to a multiple of two slots. */
1766 int new_offset = ((offset[i] + 2*REGISTER_SIZE-1)
1767 & -(2*REGISTER_SIZE));
1769 /* Note the space we've wasted, if any. */
1770 bytes_reserved += new_offset - offset[i];
1771 offset[i] = new_offset;
1774 cum_bytes_reserved += bytes_reserved;
1777 /* CUM_BYTES_RESERVED already accounts for all the arguments
1778 passed by the user. However, the ABIs mandate minimum stack space
1779 allocations for outgoing arguments.
1781 The ABIs also mandate minimum stack alignments which we must
1783 cum_bytes_aligned = STACK_ALIGN (cum_bytes_reserved);
1784 sp += max (cum_bytes_aligned, REG_PARM_STACK_SPACE);
1786 /* Now write each of the args at the proper offset down the stack. */
1787 for (i = 0; i < nargs; i++)
1788 write_memory (orig_sp + offset[i], VALUE_CONTENTS (args[i]), lengths[i]);
1790 /* If a structure has to be returned, set up register 28 to hold its
1793 write_register (28, struct_addr);
1795 /* For the PA64 we must pass a pointer to the outgoing argument list.
1796 The ABI mandates that the pointer should point to the first byte of
1797 storage beyond the register flushback area.
1799 However, the call dummy expects the outgoing argument pointer to
1800 be passed in register %r4. */
1801 write_register (4, orig_sp + REG_PARM_STACK_SPACE);
1803 /* ?!? This needs further work. We need to set up the global data
1804 pointer for this procedure. This assumes the same global pointer
1805 for every procedure. The call dummy expects the dp value to
1806 be passed in register %r6. */
1807 write_register (6, read_register (27));
1809 /* The stack will have 64 bytes of additional space for a frame marker. */
1815 /* This function pushes a stack frame with arguments as part of the
1816 inferior function calling mechanism.
1818 This is the version of the function for the 32-bit PA machines, in
1819 which later arguments appear at lower addresses. (The stack always
1820 grows towards higher addresses.)
1822 We simply allocate the appropriate amount of stack space and put
1823 arguments into their proper slots. The call dummy code will copy
1824 arguments into registers as needed by the ABI. */
1827 hppa_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
1828 int struct_return, CORE_ADDR struct_addr)
1830 /* array of arguments' offsets */
1831 int *offset = (int *) alloca (nargs * sizeof (int));
1833 /* array of arguments' lengths: real lengths in bytes, not aligned to
1835 int *lengths = (int *) alloca (nargs * sizeof (int));
1837 /* The number of stack bytes occupied by the current argument. */
1840 /* The total number of bytes reserved for the arguments. */
1841 int cum_bytes_reserved = 0;
1843 /* Similarly, but aligned. */
1844 int cum_bytes_aligned = 0;
1847 /* Iterate over each argument provided by the user. */
1848 for (i = 0; i < nargs; i++)
1850 lengths[i] = TYPE_LENGTH (VALUE_TYPE (args[i]));
1852 /* Align the size of the argument to the word size for this
1854 bytes_reserved = (lengths[i] + REGISTER_SIZE - 1) & -REGISTER_SIZE;
1856 offset[i] = (cum_bytes_reserved
1857 + (lengths[i] > 4 ? bytes_reserved : lengths[i]));
1859 /* If the argument is a double word argument, then it needs to be
1860 double word aligned. */
1861 if ((bytes_reserved == 2 * REGISTER_SIZE)
1862 && (offset[i] % 2 * REGISTER_SIZE))
1865 /* BYTES_RESERVED is already aligned to the word, so we put
1866 the argument at one word more down the stack.
1868 This will leave one empty word on the stack, and one unused
1869 register as mandated by the ABI. */
1870 new_offset = ((offset[i] + 2 * REGISTER_SIZE - 1)
1871 & -(2 * REGISTER_SIZE));
1873 if ((new_offset - offset[i]) >= 2 * REGISTER_SIZE)
1875 bytes_reserved += REGISTER_SIZE;
1876 offset[i] += REGISTER_SIZE;
1880 cum_bytes_reserved += bytes_reserved;
1884 /* CUM_BYTES_RESERVED already accounts for all the arguments passed
1885 by the user. However, the ABI mandates minimum stack space
1886 allocations for outgoing arguments.
1888 The ABI also mandates minimum stack alignments which we must
1890 cum_bytes_aligned = STACK_ALIGN (cum_bytes_reserved);
1891 sp += max (cum_bytes_aligned, REG_PARM_STACK_SPACE);
1893 /* Now write each of the args at the proper offset down the stack.
1894 ?!? We need to promote values to a full register instead of skipping
1895 words in the stack. */
1896 for (i = 0; i < nargs; i++)
1897 write_memory (sp - offset[i], VALUE_CONTENTS (args[i]), lengths[i]);
1899 /* If a structure has to be returned, set up register 28 to hold its
1902 write_register (28, struct_addr);
1904 /* The stack will have 32 bytes of additional space for a frame marker. */
1910 /* elz: this function returns a value which is built looking at the given address.
1911 It is called from call_function_by_hand, in case we need to return a
1912 value which is larger than 64 bits, and it is stored in the stack rather than
1913 in the registers r28 and r29 or fr4.
1914 This function does the same stuff as value_being_returned in values.c, but
1915 gets the value from the stack rather than from the buffer where all the
1916 registers were saved when the function called completed. */
1918 hppa_value_returned_from_stack (register struct type *valtype, CORE_ADDR addr)
1920 register struct value *val;
1922 val = allocate_value (valtype);
1923 CHECK_TYPEDEF (valtype);
1924 target_read_memory (addr, VALUE_CONTENTS_RAW (val), TYPE_LENGTH (valtype));
1931 /* elz: Used to lookup a symbol in the shared libraries.
1932 This function calls shl_findsym, indirectly through a
1933 call to __d_shl_get. __d_shl_get is in end.c, which is always
1934 linked in by the hp compilers/linkers.
1935 The call to shl_findsym cannot be made directly because it needs
1936 to be active in target address space.
1937 inputs: - minimal symbol pointer for the function we want to look up
1938 - address in target space of the descriptor for the library
1939 where we want to look the symbol up.
1940 This address is retrieved using the
1941 som_solib_get_solib_by_pc function (somsolib.c).
1942 output: - real address in the library of the function.
1943 note: the handle can be null, in which case shl_findsym will look for
1944 the symbol in all the loaded shared libraries.
1945 files to look at if you need reference on this stuff:
1946 dld.c, dld_shl_findsym.c
1948 man entry for shl_findsym */
1951 find_stub_with_shl_get (struct minimal_symbol *function, CORE_ADDR handle)
1953 struct symbol *get_sym, *symbol2;
1954 struct minimal_symbol *buff_minsym, *msymbol;
1956 struct value **args;
1957 struct value *funcval;
1960 int x, namelen, err_value, tmp = -1;
1961 CORE_ADDR endo_buff_addr, value_return_addr, errno_return_addr;
1962 CORE_ADDR stub_addr;
1965 args = alloca (sizeof (struct value *) * 8); /* 6 for the arguments and one null one??? */
1966 funcval = find_function_in_inferior ("__d_shl_get");
1967 get_sym = lookup_symbol ("__d_shl_get", NULL, VAR_NAMESPACE, NULL, NULL);
1968 buff_minsym = lookup_minimal_symbol ("__buffer", NULL, NULL);
1969 msymbol = lookup_minimal_symbol ("__shldp", NULL, NULL);
1970 symbol2 = lookup_symbol ("__shldp", NULL, VAR_NAMESPACE, NULL, NULL);
1971 endo_buff_addr = SYMBOL_VALUE_ADDRESS (buff_minsym);
1972 namelen = strlen (DEPRECATED_SYMBOL_NAME (function));
1973 value_return_addr = endo_buff_addr + namelen;
1974 ftype = check_typedef (SYMBOL_TYPE (get_sym));
1977 if ((x = value_return_addr % 64) != 0)
1978 value_return_addr = value_return_addr + 64 - x;
1980 errno_return_addr = value_return_addr + 64;
1983 /* set up stuff needed by __d_shl_get in buffer in end.o */
1985 target_write_memory (endo_buff_addr, DEPRECATED_SYMBOL_NAME (function), namelen);
1987 target_write_memory (value_return_addr, (char *) &tmp, 4);
1989 target_write_memory (errno_return_addr, (char *) &tmp, 4);
1991 target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol),
1992 (char *) &handle, 4);
1994 /* now prepare the arguments for the call */
1996 args[0] = value_from_longest (TYPE_FIELD_TYPE (ftype, 0), 12);
1997 args[1] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 1), SYMBOL_VALUE_ADDRESS (msymbol));
1998 args[2] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 2), endo_buff_addr);
1999 args[3] = value_from_longest (TYPE_FIELD_TYPE (ftype, 3), TYPE_PROCEDURE);
2000 args[4] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 4), value_return_addr);
2001 args[5] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 5), errno_return_addr);
2003 /* now call the function */
2005 val = call_function_by_hand (funcval, 6, args);
2007 /* now get the results */
2009 target_read_memory (errno_return_addr, (char *) &err_value, sizeof (err_value));
2011 target_read_memory (value_return_addr, (char *) &stub_addr, sizeof (stub_addr));
2013 error ("call to __d_shl_get failed, error code is %d", err_value);
2018 /* Cover routine for find_stub_with_shl_get to pass to catch_errors */
2020 cover_find_stub_with_shl_get (void *args_untyped)
2022 args_for_find_stub *args = args_untyped;
2023 args->return_val = find_stub_with_shl_get (args->msym, args->solib_handle);
2027 /* Insert the specified number of args and function address
2028 into a call sequence of the above form stored at DUMMYNAME.
2030 On the hppa we need to call the stack dummy through $$dyncall.
2031 Therefore our version of FIX_CALL_DUMMY takes an extra argument,
2032 real_pc, which is the location where gdb should start up the
2033 inferior to do the function call.
2035 This has to work across several versions of hpux, bsd, osf1. It has to
2036 work regardless of what compiler was used to build the inferior program.
2037 It should work regardless of whether or not end.o is available. It has
2038 to work even if gdb can not call into the dynamic loader in the inferior
2039 to query it for symbol names and addresses.
2041 Yes, all those cases should work. Luckily code exists to handle most
2042 of them. The complexity is in selecting exactly what scheme should
2043 be used to perform the inferior call.
2045 At the current time this routine is known not to handle cases where
2046 the program was linked with HP's compiler without including end.o.
2048 Please contact Jeff Law (law@cygnus.com) before changing this code. */
2051 hppa_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
2052 struct value **args, struct type *type, int gcc_p)
2054 CORE_ADDR dyncall_addr;
2055 struct minimal_symbol *msymbol;
2056 struct minimal_symbol *trampoline;
2057 int flags = read_register (FLAGS_REGNUM);
2058 struct unwind_table_entry *u = NULL;
2059 CORE_ADDR new_stub = 0;
2060 CORE_ADDR solib_handle = 0;
2062 /* Nonzero if we will use GCC's PLT call routine. This routine must be
2063 passed an import stub, not a PLABEL. It is also necessary to set %r19
2064 (the PIC register) before performing the call.
2066 If zero, then we are using __d_plt_call (HP's PLT call routine) or we
2067 are calling the target directly. When using __d_plt_call we want to
2068 use a PLABEL instead of an import stub. */
2069 int using_gcc_plt_call = 1;
2071 #ifdef GDB_TARGET_IS_HPPA_20W
2072 /* We currently use completely different code for the PA2.0W inferior
2073 function call sequences. This needs to be cleaned up. */
2075 CORE_ADDR pcsqh, pcsqt, pcoqh, pcoqt, sr5;
2076 struct target_waitstatus w;
2080 struct objfile *objfile;
2082 /* We can not modify the PC space queues directly, so we start
2083 up the inferior and execute a couple instructions to set the
2084 space queues so that they point to the call dummy in the stack. */
2085 pcsqh = read_register (PCSQ_HEAD_REGNUM);
2086 sr5 = read_register (SR5_REGNUM);
2089 pcoqh = read_register (PCOQ_HEAD_REGNUM);
2090 pcoqt = read_register (PCOQ_TAIL_REGNUM);
2091 if (target_read_memory (pcoqh, buf, 4) != 0)
2092 error ("Couldn't modify space queue\n");
2093 inst1 = extract_unsigned_integer (buf, 4);
2095 if (target_read_memory (pcoqt, buf, 4) != 0)
2096 error ("Couldn't modify space queue\n");
2097 inst2 = extract_unsigned_integer (buf, 4);
2100 *((int *) buf) = 0xe820d000;
2101 if (target_write_memory (pcoqh, buf, 4) != 0)
2102 error ("Couldn't modify space queue\n");
2105 *((int *) buf) = 0x08000240;
2106 if (target_write_memory (pcoqt, buf, 4) != 0)
2108 *((int *) buf) = inst1;
2109 target_write_memory (pcoqh, buf, 4);
2110 error ("Couldn't modify space queue\n");
2113 write_register (1, pc);
2115 /* Single step twice, the BVE instruction will set the space queue
2116 such that it points to the PC value written immediately above
2117 (ie the call dummy). */
2119 target_wait (inferior_ptid, &w);
2121 target_wait (inferior_ptid, &w);
2123 /* Restore the two instructions at the old PC locations. */
2124 *((int *) buf) = inst1;
2125 target_write_memory (pcoqh, buf, 4);
2126 *((int *) buf) = inst2;
2127 target_write_memory (pcoqt, buf, 4);
2130 /* The call dummy wants the ultimate destination address initially
2132 write_register (5, fun);
2134 /* We need to see if this objfile has a different DP value than our
2135 own (it could be a shared library for example). */
2136 ALL_OBJFILES (objfile)
2138 struct obj_section *s;
2139 obj_private_data_t *obj_private;
2141 /* See if FUN is in any section within this shared library. */
2142 for (s = objfile->sections; s < objfile->sections_end; s++)
2143 if (s->addr <= fun && fun < s->endaddr)
2146 if (s >= objfile->sections_end)
2149 obj_private = (obj_private_data_t *) objfile->obj_private;
2151 /* The DP value may be different for each objfile. But within an
2152 objfile each function uses the same dp value. Thus we do not need
2153 to grope around the opd section looking for dp values.
2155 ?!? This is not strictly correct since we may be in a shared library
2156 and want to call back into the main program. To make that case
2157 work correctly we need to set obj_private->dp for the main program's
2158 objfile, then remove this conditional. */
2159 if (obj_private->dp)
2160 write_register (27, obj_private->dp);
2167 #ifndef GDB_TARGET_IS_HPPA_20W
2168 /* Prefer __gcc_plt_call over the HP supplied routine because
2169 __gcc_plt_call works for any number of arguments. */
2171 if (lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL) == NULL)
2172 using_gcc_plt_call = 0;
2174 msymbol = lookup_minimal_symbol ("$$dyncall", NULL, NULL);
2175 if (msymbol == NULL)
2176 error ("Can't find an address for $$dyncall trampoline");
2178 dyncall_addr = SYMBOL_VALUE_ADDRESS (msymbol);
2180 /* FUN could be a procedure label, in which case we have to get
2181 its real address and the value of its GOT/DP if we plan to
2182 call the routine via gcc_plt_call. */
2183 if ((fun & 0x2) && using_gcc_plt_call)
2185 /* Get the GOT/DP value for the target function. It's
2186 at *(fun+4). Note the call dummy is *NOT* allowed to
2187 trash %r19 before calling the target function. */
2188 write_register (19, read_memory_integer ((fun & ~0x3) + 4,
2191 /* Now get the real address for the function we are calling, it's
2193 fun = (CORE_ADDR) read_memory_integer (fun & ~0x3,
2194 TARGET_PTR_BIT / 8);
2199 #ifndef GDB_TARGET_IS_PA_ELF
2200 /* FUN could be an export stub, the real address of a function, or
2201 a PLABEL. When using gcc's PLT call routine we must call an import
2202 stub rather than the export stub or real function for lazy binding
2205 If we are using the gcc PLT call routine, then we need to
2206 get the import stub for the target function. */
2207 if (using_gcc_plt_call && som_solib_get_got_by_pc (fun))
2209 struct objfile *objfile;
2210 struct minimal_symbol *funsymbol, *stub_symbol;
2211 CORE_ADDR newfun = 0;
2213 funsymbol = lookup_minimal_symbol_by_pc (fun);
2215 error ("Unable to find minimal symbol for target function.\n");
2217 /* Search all the object files for an import symbol with the
2219 ALL_OBJFILES (objfile)
2222 = lookup_minimal_symbol_solib_trampoline
2223 (DEPRECATED_SYMBOL_NAME (funsymbol), NULL, objfile);
2226 stub_symbol = lookup_minimal_symbol (DEPRECATED_SYMBOL_NAME (funsymbol),
2229 /* Found a symbol with the right name. */
2232 struct unwind_table_entry *u;
2233 /* It must be a shared library trampoline. */
2234 if (MSYMBOL_TYPE (stub_symbol) != mst_solib_trampoline)
2237 /* It must also be an import stub. */
2238 u = find_unwind_entry (SYMBOL_VALUE (stub_symbol));
2240 || (u->stub_unwind.stub_type != IMPORT
2241 #ifdef GDB_NATIVE_HPUX_11
2242 /* Sigh. The hpux 10.20 dynamic linker will blow
2243 chunks if we perform a call to an unbound function
2244 via the IMPORT_SHLIB stub. The hpux 11.00 dynamic
2245 linker will blow chunks if we do not call the
2246 unbound function via the IMPORT_SHLIB stub.
2248 We currently have no way to select bevahior on just
2249 the target. However, we only support HPUX/SOM in
2250 native mode. So we conditinalize on a native
2251 #ifdef. Ugly. Ugly. Ugly */
2252 && u->stub_unwind.stub_type != IMPORT_SHLIB
2257 /* OK. Looks like the correct import stub. */
2258 newfun = SYMBOL_VALUE (stub_symbol);
2261 /* If we found an IMPORT stub, then we want to stop
2262 searching now. If we found an IMPORT_SHLIB, we want
2263 to continue the search in the hopes that we will find
2265 if (u->stub_unwind.stub_type == IMPORT)
2270 /* Ouch. We did not find an import stub. Make an attempt to
2271 do the right thing instead of just croaking. Most of the
2272 time this will actually work. */
2274 write_register (19, som_solib_get_got_by_pc (fun));
2276 u = find_unwind_entry (fun);
2278 && (u->stub_unwind.stub_type == IMPORT
2279 || u->stub_unwind.stub_type == IMPORT_SHLIB))
2280 trampoline = lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL);
2282 /* If we found the import stub in the shared library, then we have
2283 to set %r19 before we call the stub. */
2284 if (u && u->stub_unwind.stub_type == IMPORT_SHLIB)
2285 write_register (19, som_solib_get_got_by_pc (fun));
2290 /* If we are calling into another load module then have sr4export call the
2291 magic __d_plt_call routine which is linked in from end.o.
2293 You can't use _sr4export to make the call as the value in sp-24 will get
2294 fried and you end up returning to the wrong location. You can't call the
2295 target as the code to bind the PLT entry to a function can't return to a
2298 Also, query the dynamic linker in the inferior to provide a suitable
2299 PLABEL for the target function. */
2300 if (!using_gcc_plt_call)
2304 /* Get a handle for the shared library containing FUN. Given the
2305 handle we can query the shared library for a PLABEL. */
2306 solib_handle = som_solib_get_solib_by_pc (fun);
2310 struct minimal_symbol *fmsymbol = lookup_minimal_symbol_by_pc (fun);
2312 trampoline = lookup_minimal_symbol ("__d_plt_call", NULL, NULL);
2314 if (trampoline == NULL)
2316 error ("Can't find an address for __d_plt_call or __gcc_plt_call trampoline\nSuggest linking executable with -g or compiling with gcc.");
2319 /* This is where sr4export will jump to. */
2320 new_fun = SYMBOL_VALUE_ADDRESS (trampoline);
2322 /* If the function is in a shared library, then call __d_shl_get to
2323 get a PLABEL for the target function. */
2324 new_stub = find_stub_with_shl_get (fmsymbol, solib_handle);
2327 error ("Can't find an import stub for %s", DEPRECATED_SYMBOL_NAME (fmsymbol));
2329 /* We have to store the address of the stub in __shlib_funcptr. */
2330 msymbol = lookup_minimal_symbol ("__shlib_funcptr", NULL,
2331 (struct objfile *) NULL);
2333 if (msymbol == NULL)
2334 error ("Can't find an address for __shlib_funcptr");
2335 target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol),
2336 (char *) &new_stub, 4);
2338 /* We want sr4export to call __d_plt_call, so we claim it is
2339 the final target. Clear trampoline. */
2345 /* Store upper 21 bits of function address into ldil. fun will either be
2346 the final target (most cases) or __d_plt_call when calling into a shared
2347 library and __gcc_plt_call is not available. */
2348 store_unsigned_integer
2349 (&dummy[FUNC_LDIL_OFFSET],
2351 deposit_21 (fun >> 11,
2352 extract_unsigned_integer (&dummy[FUNC_LDIL_OFFSET],
2353 INSTRUCTION_SIZE)));
2355 /* Store lower 11 bits of function address into ldo */
2356 store_unsigned_integer
2357 (&dummy[FUNC_LDO_OFFSET],
2359 deposit_14 (fun & MASK_11,
2360 extract_unsigned_integer (&dummy[FUNC_LDO_OFFSET],
2361 INSTRUCTION_SIZE)));
2362 #ifdef SR4EXPORT_LDIL_OFFSET
2365 CORE_ADDR trampoline_addr;
2367 /* We may still need sr4export's address too. */
2369 if (trampoline == NULL)
2371 msymbol = lookup_minimal_symbol ("_sr4export", NULL, NULL);
2372 if (msymbol == NULL)
2373 error ("Can't find an address for _sr4export trampoline");
2375 trampoline_addr = SYMBOL_VALUE_ADDRESS (msymbol);
2378 trampoline_addr = SYMBOL_VALUE_ADDRESS (trampoline);
2381 /* Store upper 21 bits of trampoline's address into ldil */
2382 store_unsigned_integer
2383 (&dummy[SR4EXPORT_LDIL_OFFSET],
2385 deposit_21 (trampoline_addr >> 11,
2386 extract_unsigned_integer (&dummy[SR4EXPORT_LDIL_OFFSET],
2387 INSTRUCTION_SIZE)));
2389 /* Store lower 11 bits of trampoline's address into ldo */
2390 store_unsigned_integer
2391 (&dummy[SR4EXPORT_LDO_OFFSET],
2393 deposit_14 (trampoline_addr & MASK_11,
2394 extract_unsigned_integer (&dummy[SR4EXPORT_LDO_OFFSET],
2395 INSTRUCTION_SIZE)));
2399 write_register (22, pc);
2401 /* If we are in a syscall, then we should call the stack dummy
2402 directly. $$dyncall is not needed as the kernel sets up the
2403 space id registers properly based on the value in %r31. In
2404 fact calling $$dyncall will not work because the value in %r22
2405 will be clobbered on the syscall exit path.
2407 Similarly if the current PC is in a shared library. Note however,
2408 this scheme won't work if the shared library isn't mapped into
2409 the same space as the stack. */
2412 #ifndef GDB_TARGET_IS_PA_ELF
2413 else if (som_solib_get_got_by_pc (hppa_target_read_pc (inferior_ptid)))
2417 return dyncall_addr;
2421 /* If the pid is in a syscall, then the FP register is not readable.
2422 We'll return zero in that case, rather than attempting to read it
2423 and cause a warning. */
2426 hppa_read_fp (int pid)
2428 int flags = read_register (FLAGS_REGNUM);
2432 return (CORE_ADDR) 0;
2435 /* This is the only site that may directly read_register () the FP
2436 register. All others must use TARGET_READ_FP (). */
2437 return read_register (FP_REGNUM);
2441 hppa_target_read_fp (void)
2443 return hppa_read_fp (PIDGET (inferior_ptid));
2446 /* Get the PC from %r31 if currently in a syscall. Also mask out privilege
2450 hppa_target_read_pc (ptid_t ptid)
2452 int flags = read_register_pid (FLAGS_REGNUM, ptid);
2454 /* The following test does not belong here. It is OS-specific, and belongs
2456 /* Test SS_INSYSCALL */
2458 return read_register_pid (31, ptid) & ~0x3;
2460 return read_register_pid (PC_REGNUM, ptid) & ~0x3;
2463 /* Write out the PC. If currently in a syscall, then also write the new
2464 PC value into %r31. */
2467 hppa_target_write_pc (CORE_ADDR v, ptid_t ptid)
2469 int flags = read_register_pid (FLAGS_REGNUM, ptid);
2471 /* The following test does not belong here. It is OS-specific, and belongs
2473 /* If in a syscall, then set %r31. Also make sure to get the
2474 privilege bits set correctly. */
2475 /* Test SS_INSYSCALL */
2477 write_register_pid (31, v | 0x3, ptid);
2479 write_register_pid (PC_REGNUM, v, ptid);
2480 write_register_pid (NPC_REGNUM, v + 4, ptid);
2483 /* return the alignment of a type in bytes. Structures have the maximum
2484 alignment required by their fields. */
2487 hppa_alignof (struct type *type)
2489 int max_align, align, i;
2490 CHECK_TYPEDEF (type);
2491 switch (TYPE_CODE (type))
2496 return TYPE_LENGTH (type);
2497 case TYPE_CODE_ARRAY:
2498 return hppa_alignof (TYPE_FIELD_TYPE (type, 0));
2499 case TYPE_CODE_STRUCT:
2500 case TYPE_CODE_UNION:
2502 for (i = 0; i < TYPE_NFIELDS (type); i++)
2504 /* Bit fields have no real alignment. */
2505 /* if (!TYPE_FIELD_BITPOS (type, i)) */
2506 if (!TYPE_FIELD_BITSIZE (type, i)) /* elz: this should be bitsize */
2508 align = hppa_alignof (TYPE_FIELD_TYPE (type, i));
2509 max_align = max (max_align, align);
2518 /* Print the register regnum, or all registers if regnum is -1 */
2521 pa_do_registers_info (int regnum, int fpregs)
2523 char raw_regs[REGISTER_BYTES];
2526 /* Make a copy of gdb's save area (may cause actual
2527 reads from the target). */
2528 for (i = 0; i < NUM_REGS; i++)
2529 frame_register_read (deprecated_selected_frame, i, raw_regs + REGISTER_BYTE (i));
2532 pa_print_registers (raw_regs, regnum, fpregs);
2533 else if (regnum < FP4_REGNUM)
2537 /* Why is the value not passed through "extract_signed_integer"
2538 as in "pa_print_registers" below? */
2539 pa_register_look_aside (raw_regs, regnum, ®_val[0]);
2543 printf_unfiltered ("%s %lx\n", REGISTER_NAME (regnum), reg_val[1]);
2547 /* Fancy % formats to prevent leading zeros. */
2548 if (reg_val[0] == 0)
2549 printf_unfiltered ("%s %lx\n", REGISTER_NAME (regnum), reg_val[1]);
2551 printf_unfiltered ("%s %lx%8.8lx\n", REGISTER_NAME (regnum),
2552 reg_val[0], reg_val[1]);
2556 /* Note that real floating point values only start at
2557 FP4_REGNUM. FP0 and up are just status and error
2558 registers, which have integral (bit) values. */
2559 pa_print_fp_reg (regnum);
2562 /********** new function ********************/
2564 pa_do_strcat_registers_info (int regnum, int fpregs, struct ui_file *stream,
2565 enum precision_type precision)
2567 char raw_regs[REGISTER_BYTES];
2570 /* Make a copy of gdb's save area (may cause actual
2571 reads from the target). */
2572 for (i = 0; i < NUM_REGS; i++)
2573 frame_register_read (deprecated_selected_frame, i, raw_regs + REGISTER_BYTE (i));
2576 pa_strcat_registers (raw_regs, regnum, fpregs, stream);
2578 else if (regnum < FP4_REGNUM)
2582 /* Why is the value not passed through "extract_signed_integer"
2583 as in "pa_print_registers" below? */
2584 pa_register_look_aside (raw_regs, regnum, ®_val[0]);
2588 fprintf_unfiltered (stream, "%s %lx", REGISTER_NAME (regnum), reg_val[1]);
2592 /* Fancy % formats to prevent leading zeros. */
2593 if (reg_val[0] == 0)
2594 fprintf_unfiltered (stream, "%s %lx", REGISTER_NAME (regnum),
2597 fprintf_unfiltered (stream, "%s %lx%8.8lx", REGISTER_NAME (regnum),
2598 reg_val[0], reg_val[1]);
2602 /* Note that real floating point values only start at
2603 FP4_REGNUM. FP0 and up are just status and error
2604 registers, which have integral (bit) values. */
2605 pa_strcat_fp_reg (regnum, stream, precision);
2608 /* If this is a PA2.0 machine, fetch the real 64-bit register
2609 value. Otherwise use the info from gdb's saved register area.
2611 Note that reg_val is really expected to be an array of longs,
2612 with two elements. */
2614 pa_register_look_aside (char *raw_regs, int regnum, long *raw_val)
2616 static int know_which = 0; /* False */
2619 unsigned int offset;
2624 char *buf = alloca (max_register_size (current_gdbarch));
2629 if (CPU_PA_RISC2_0 == sysconf (_SC_CPU_VERSION))
2634 know_which = 1; /* True */
2642 raw_val[1] = *(long *) (raw_regs + REGISTER_BYTE (regnum));
2646 /* Code below copied from hppah-nat.c, with fixes for wide
2647 registers, using different area of save_state, etc. */
2648 if (regnum == FLAGS_REGNUM || regnum >= FP0_REGNUM ||
2649 !HAVE_STRUCT_SAVE_STATE_T || !HAVE_STRUCT_MEMBER_SS_WIDE)
2651 /* Use narrow regs area of save_state and default macro. */
2652 offset = U_REGS_OFFSET;
2653 regaddr = register_addr (regnum, offset);
2658 /* Use wide regs area, and calculate registers as 8 bytes wide.
2660 We'd like to do this, but current version of "C" doesn't
2663 offset = offsetof(save_state_t, ss_wide);
2665 Note that to avoid "C" doing typed pointer arithmetic, we
2666 have to cast away the type in our offset calculation:
2667 otherwise we get an offset of 1! */
2669 /* NB: save_state_t is not available before HPUX 9.
2670 The ss_wide field is not available previous to HPUX 10.20,
2671 so to avoid compile-time warnings, we only compile this for
2672 PA 2.0 processors. This control path should only be followed
2673 if we're debugging a PA 2.0 processor, so this should not cause
2676 /* #if the following code out so that this file can still be
2677 compiled on older HPUX boxes (< 10.20) which don't have
2678 this structure/structure member. */
2679 #if HAVE_STRUCT_SAVE_STATE_T == 1 && HAVE_STRUCT_MEMBER_SS_WIDE == 1
2682 offset = ((int) &temp.ss_wide) - ((int) &temp);
2683 regaddr = offset + regnum * 8;
2688 for (i = start; i < 2; i++)
2691 raw_val[i] = call_ptrace (PT_RUREGS, PIDGET (inferior_ptid),
2692 (PTRACE_ARG3_TYPE) regaddr, 0);
2695 /* Warning, not error, in case we are attached; sometimes the
2696 kernel doesn't let us at the registers. */
2697 char *err = safe_strerror (errno);
2698 char *msg = alloca (strlen (err) + 128);
2699 sprintf (msg, "reading register %s: %s", REGISTER_NAME (regnum), err);
2704 regaddr += sizeof (long);
2707 if (regnum == PCOQ_HEAD_REGNUM || regnum == PCOQ_TAIL_REGNUM)
2708 raw_val[1] &= ~0x3; /* I think we're masking out space bits */
2714 /* "Info all-reg" command */
2717 pa_print_registers (char *raw_regs, int regnum, int fpregs)
2720 /* Alas, we are compiled so that "long long" is 32 bits */
2723 int rows = 48, columns = 2;
2725 for (i = 0; i < rows; i++)
2727 for (j = 0; j < columns; j++)
2729 /* We display registers in column-major order. */
2730 int regnum = i + j * rows;
2732 /* Q: Why is the value passed through "extract_signed_integer",
2733 while above, in "pa_do_registers_info" it isn't?
2735 pa_register_look_aside (raw_regs, regnum, &raw_val[0]);
2737 /* Even fancier % formats to prevent leading zeros
2738 and still maintain the output in columns. */
2741 /* Being big-endian, on this machine the low bits
2742 (the ones we want to look at) are in the second longword. */
2743 long_val = extract_signed_integer (&raw_val[1], 4);
2744 printf_filtered ("%10.10s: %8lx ",
2745 REGISTER_NAME (regnum), long_val);
2749 /* raw_val = extract_signed_integer(&raw_val, 8); */
2750 if (raw_val[0] == 0)
2751 printf_filtered ("%10.10s: %8lx ",
2752 REGISTER_NAME (regnum), raw_val[1]);
2754 printf_filtered ("%10.10s: %8lx%8.8lx ",
2755 REGISTER_NAME (regnum),
2756 raw_val[0], raw_val[1]);
2759 printf_unfiltered ("\n");
2763 for (i = FP4_REGNUM; i < NUM_REGS; i++) /* FP4_REGNUM == 72 */
2764 pa_print_fp_reg (i);
2767 /************* new function ******************/
2769 pa_strcat_registers (char *raw_regs, int regnum, int fpregs,
2770 struct ui_file *stream)
2773 long raw_val[2]; /* Alas, we are compiled so that "long long" is 32 bits */
2775 enum precision_type precision;
2777 precision = unspecified_precision;
2779 for (i = 0; i < 18; i++)
2781 for (j = 0; j < 4; j++)
2783 /* Q: Why is the value passed through "extract_signed_integer",
2784 while above, in "pa_do_registers_info" it isn't?
2786 pa_register_look_aside (raw_regs, i + (j * 18), &raw_val[0]);
2788 /* Even fancier % formats to prevent leading zeros
2789 and still maintain the output in columns. */
2792 /* Being big-endian, on this machine the low bits
2793 (the ones we want to look at) are in the second longword. */
2794 long_val = extract_signed_integer (&raw_val[1], 4);
2795 fprintf_filtered (stream, "%8.8s: %8lx ",
2796 REGISTER_NAME (i + (j * 18)), long_val);
2800 /* raw_val = extract_signed_integer(&raw_val, 8); */
2801 if (raw_val[0] == 0)
2802 fprintf_filtered (stream, "%8.8s: %8lx ",
2803 REGISTER_NAME (i + (j * 18)), raw_val[1]);
2805 fprintf_filtered (stream, "%8.8s: %8lx%8.8lx ",
2806 REGISTER_NAME (i + (j * 18)), raw_val[0],
2810 fprintf_unfiltered (stream, "\n");
2814 for (i = FP4_REGNUM; i < NUM_REGS; i++) /* FP4_REGNUM == 72 */
2815 pa_strcat_fp_reg (i, stream, precision);
2819 pa_print_fp_reg (int i)
2821 char *raw_buffer = alloca (max_register_size (current_gdbarch));
2822 char *virtual_buffer = alloca (max_register_size (current_gdbarch));
2824 /* Get 32bits of data. */
2825 frame_register_read (deprecated_selected_frame, i, raw_buffer);
2827 /* Put it in the buffer. No conversions are ever necessary. */
2828 memcpy (virtual_buffer, raw_buffer, REGISTER_RAW_SIZE (i));
2830 fputs_filtered (REGISTER_NAME (i), gdb_stdout);
2831 print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), gdb_stdout);
2832 fputs_filtered ("(single precision) ", gdb_stdout);
2834 val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0, gdb_stdout, 0,
2835 1, 0, Val_pretty_default);
2836 printf_filtered ("\n");
2838 /* If "i" is even, then this register can also be a double-precision
2839 FP register. Dump it out as such. */
2842 /* Get the data in raw format for the 2nd half. */
2843 frame_register_read (deprecated_selected_frame, i + 1, raw_buffer);
2845 /* Copy it into the appropriate part of the virtual buffer. */
2846 memcpy (virtual_buffer + REGISTER_RAW_SIZE (i), raw_buffer,
2847 REGISTER_RAW_SIZE (i));
2849 /* Dump it as a double. */
2850 fputs_filtered (REGISTER_NAME (i), gdb_stdout);
2851 print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), gdb_stdout);
2852 fputs_filtered ("(double precision) ", gdb_stdout);
2854 val_print (builtin_type_double, virtual_buffer, 0, 0, gdb_stdout, 0,
2855 1, 0, Val_pretty_default);
2856 printf_filtered ("\n");
2860 /*************** new function ***********************/
2862 pa_strcat_fp_reg (int i, struct ui_file *stream, enum precision_type precision)
2864 char *raw_buffer = alloca (max_register_size (current_gdbarch));
2865 char *virtual_buffer = alloca (max_register_size (current_gdbarch));
2867 fputs_filtered (REGISTER_NAME (i), stream);
2868 print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), stream);
2870 /* Get 32bits of data. */
2871 frame_register_read (deprecated_selected_frame, i, raw_buffer);
2873 /* Put it in the buffer. No conversions are ever necessary. */
2874 memcpy (virtual_buffer, raw_buffer, REGISTER_RAW_SIZE (i));
2876 if (precision == double_precision && (i % 2) == 0)
2879 char *raw_buf = alloca (max_register_size (current_gdbarch));
2881 /* Get the data in raw format for the 2nd half. */
2882 frame_register_read (deprecated_selected_frame, i + 1, raw_buf);
2884 /* Copy it into the appropriate part of the virtual buffer. */
2885 memcpy (virtual_buffer + REGISTER_RAW_SIZE (i), raw_buf, REGISTER_RAW_SIZE (i));
2887 val_print (builtin_type_double, virtual_buffer, 0, 0, stream, 0,
2888 1, 0, Val_pretty_default);
2893 val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0, stream, 0,
2894 1, 0, Val_pretty_default);
2899 /* Return one if PC is in the call path of a trampoline, else return zero.
2901 Note we return one for *any* call trampoline (long-call, arg-reloc), not
2902 just shared library trampolines (import, export). */
2905 hppa_in_solib_call_trampoline (CORE_ADDR pc, char *name)
2907 struct minimal_symbol *minsym;
2908 struct unwind_table_entry *u;
2909 static CORE_ADDR dyncall = 0;
2910 static CORE_ADDR sr4export = 0;
2912 #ifdef GDB_TARGET_IS_HPPA_20W
2913 /* PA64 has a completely different stub/trampoline scheme. Is it
2914 better? Maybe. It's certainly harder to determine with any
2915 certainty that we are in a stub because we can not refer to the
2918 The heuristic is simple. Try to lookup the current PC value in th
2919 minimal symbol table. If that fails, then assume we are not in a
2922 Then see if the PC value falls within the section bounds for the
2923 section containing the minimal symbol we found in the first
2924 step. If it does, then assume we are not in a stub and return.
2926 Finally peek at the instructions to see if they look like a stub. */
2928 struct minimal_symbol *minsym;
2933 minsym = lookup_minimal_symbol_by_pc (pc);
2937 sec = SYMBOL_BFD_SECTION (minsym);
2940 && sec->vma + sec->_cooked_size < pc)
2943 /* We might be in a stub. Peek at the instructions. Stubs are 3
2944 instructions long. */
2945 insn = read_memory_integer (pc, 4);
2947 /* Find out where we think we are within the stub. */
2948 if ((insn & 0xffffc00e) == 0x53610000)
2950 else if ((insn & 0xffffffff) == 0xe820d000)
2952 else if ((insn & 0xffffc00e) == 0x537b0000)
2957 /* Now verify each insn in the range looks like a stub instruction. */
2958 insn = read_memory_integer (addr, 4);
2959 if ((insn & 0xffffc00e) != 0x53610000)
2962 /* Now verify each insn in the range looks like a stub instruction. */
2963 insn = read_memory_integer (addr + 4, 4);
2964 if ((insn & 0xffffffff) != 0xe820d000)
2967 /* Now verify each insn in the range looks like a stub instruction. */
2968 insn = read_memory_integer (addr + 8, 4);
2969 if ((insn & 0xffffc00e) != 0x537b0000)
2972 /* Looks like a stub. */
2977 /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a
2980 /* First see if PC is in one of the two C-library trampolines. */
2983 minsym = lookup_minimal_symbol ("$$dyncall", NULL, NULL);
2985 dyncall = SYMBOL_VALUE_ADDRESS (minsym);
2992 minsym = lookup_minimal_symbol ("_sr4export", NULL, NULL);
2994 sr4export = SYMBOL_VALUE_ADDRESS (minsym);
2999 if (pc == dyncall || pc == sr4export)
3002 minsym = lookup_minimal_symbol_by_pc (pc);
3003 if (minsym && strcmp (DEPRECATED_SYMBOL_NAME (minsym), ".stub") == 0)
3006 /* Get the unwind descriptor corresponding to PC, return zero
3007 if no unwind was found. */
3008 u = find_unwind_entry (pc);
3012 /* If this isn't a linker stub, then return now. */
3013 if (u->stub_unwind.stub_type == 0)
3016 /* By definition a long-branch stub is a call stub. */
3017 if (u->stub_unwind.stub_type == LONG_BRANCH)
3020 /* The call and return path execute the same instructions within
3021 an IMPORT stub! So an IMPORT stub is both a call and return
3023 if (u->stub_unwind.stub_type == IMPORT)
3026 /* Parameter relocation stubs always have a call path and may have a
3028 if (u->stub_unwind.stub_type == PARAMETER_RELOCATION
3029 || u->stub_unwind.stub_type == EXPORT)
3033 /* Search forward from the current PC until we hit a branch
3034 or the end of the stub. */
3035 for (addr = pc; addr <= u->region_end; addr += 4)
3039 insn = read_memory_integer (addr, 4);
3041 /* Does it look like a bl? If so then it's the call path, if
3042 we find a bv or be first, then we're on the return path. */
3043 if ((insn & 0xfc00e000) == 0xe8000000)
3045 else if ((insn & 0xfc00e001) == 0xe800c000
3046 || (insn & 0xfc000000) == 0xe0000000)
3050 /* Should never happen. */
3051 warning ("Unable to find branch in parameter relocation stub.\n");
3055 /* Unknown stub type. For now, just return zero. */
3059 /* Return one if PC is in the return path of a trampoline, else return zero.
3061 Note we return one for *any* call trampoline (long-call, arg-reloc), not
3062 just shared library trampolines (import, export). */
3065 hppa_in_solib_return_trampoline (CORE_ADDR pc, char *name)
3067 struct unwind_table_entry *u;
3069 /* Get the unwind descriptor corresponding to PC, return zero
3070 if no unwind was found. */
3071 u = find_unwind_entry (pc);
3075 /* If this isn't a linker stub or it's just a long branch stub, then
3077 if (u->stub_unwind.stub_type == 0 || u->stub_unwind.stub_type == LONG_BRANCH)
3080 /* The call and return path execute the same instructions within
3081 an IMPORT stub! So an IMPORT stub is both a call and return
3083 if (u->stub_unwind.stub_type == IMPORT)
3086 /* Parameter relocation stubs always have a call path and may have a
3088 if (u->stub_unwind.stub_type == PARAMETER_RELOCATION
3089 || u->stub_unwind.stub_type == EXPORT)
3093 /* Search forward from the current PC until we hit a branch
3094 or the end of the stub. */
3095 for (addr = pc; addr <= u->region_end; addr += 4)
3099 insn = read_memory_integer (addr, 4);
3101 /* Does it look like a bl? If so then it's the call path, if
3102 we find a bv or be first, then we're on the return path. */
3103 if ((insn & 0xfc00e000) == 0xe8000000)
3105 else if ((insn & 0xfc00e001) == 0xe800c000
3106 || (insn & 0xfc000000) == 0xe0000000)
3110 /* Should never happen. */
3111 warning ("Unable to find branch in parameter relocation stub.\n");
3115 /* Unknown stub type. For now, just return zero. */
3120 /* Figure out if PC is in a trampoline, and if so find out where
3121 the trampoline will jump to. If not in a trampoline, return zero.
3123 Simple code examination probably is not a good idea since the code
3124 sequences in trampolines can also appear in user code.
3126 We use unwinds and information from the minimal symbol table to
3127 determine when we're in a trampoline. This won't work for ELF
3128 (yet) since it doesn't create stub unwind entries. Whether or
3129 not ELF will create stub unwinds or normal unwinds for linker
3130 stubs is still being debated.
3132 This should handle simple calls through dyncall or sr4export,
3133 long calls, argument relocation stubs, and dyncall/sr4export
3134 calling an argument relocation stub. It even handles some stubs
3135 used in dynamic executables. */
3138 hppa_skip_trampoline_code (CORE_ADDR pc)
3141 long prev_inst, curr_inst, loc;
3142 static CORE_ADDR dyncall = 0;
3143 static CORE_ADDR dyncall_external = 0;
3144 static CORE_ADDR sr4export = 0;
3145 struct minimal_symbol *msym;
3146 struct unwind_table_entry *u;
3148 /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a
3153 msym = lookup_minimal_symbol ("$$dyncall", NULL, NULL);
3155 dyncall = SYMBOL_VALUE_ADDRESS (msym);
3160 if (!dyncall_external)
3162 msym = lookup_minimal_symbol ("$$dyncall_external", NULL, NULL);
3164 dyncall_external = SYMBOL_VALUE_ADDRESS (msym);
3166 dyncall_external = -1;
3171 msym = lookup_minimal_symbol ("_sr4export", NULL, NULL);
3173 sr4export = SYMBOL_VALUE_ADDRESS (msym);
3178 /* Addresses passed to dyncall may *NOT* be the actual address
3179 of the function. So we may have to do something special. */
3182 pc = (CORE_ADDR) read_register (22);
3184 /* If bit 30 (counting from the left) is on, then pc is the address of
3185 the PLT entry for this function, not the address of the function
3186 itself. Bit 31 has meaning too, but only for MPE. */
3188 pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8);
3190 if (pc == dyncall_external)
3192 pc = (CORE_ADDR) read_register (22);
3193 pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8);
3195 else if (pc == sr4export)
3196 pc = (CORE_ADDR) (read_register (22));
3198 /* Get the unwind descriptor corresponding to PC, return zero
3199 if no unwind was found. */
3200 u = find_unwind_entry (pc);
3204 /* If this isn't a linker stub, then return now. */
3205 /* elz: attention here! (FIXME) because of a compiler/linker
3206 error, some stubs which should have a non zero stub_unwind.stub_type
3207 have unfortunately a value of zero. So this function would return here
3208 as if we were not in a trampoline. To fix this, we go look at the partial
3209 symbol information, which reports this guy as a stub.
3210 (FIXME): Unfortunately, we are not that lucky: it turns out that the
3211 partial symbol information is also wrong sometimes. This is because
3212 when it is entered (somread.c::som_symtab_read()) it can happen that
3213 if the type of the symbol (from the som) is Entry, and the symbol is
3214 in a shared library, then it can also be a trampoline. This would
3215 be OK, except that I believe the way they decide if we are ina shared library
3216 does not work. SOOOO..., even if we have a regular function w/o trampolines
3217 its minimal symbol can be assigned type mst_solib_trampoline.
3218 Also, if we find that the symbol is a real stub, then we fix the unwind
3219 descriptor, and define the stub type to be EXPORT.
3220 Hopefully this is correct most of the times. */
3221 if (u->stub_unwind.stub_type == 0)
3224 /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed
3225 we can delete all the code which appears between the lines */
3226 /*--------------------------------------------------------------------------*/
3227 msym = lookup_minimal_symbol_by_pc (pc);
3229 if (msym == NULL || MSYMBOL_TYPE (msym) != mst_solib_trampoline)
3230 return orig_pc == pc ? 0 : pc & ~0x3;
3232 else if (msym != NULL && MSYMBOL_TYPE (msym) == mst_solib_trampoline)
3234 struct objfile *objfile;
3235 struct minimal_symbol *msymbol;
3236 int function_found = 0;
3238 /* go look if there is another minimal symbol with the same name as
3239 this one, but with type mst_text. This would happen if the msym
3240 is an actual trampoline, in which case there would be another
3241 symbol with the same name corresponding to the real function */
3243 ALL_MSYMBOLS (objfile, msymbol)
3245 if (MSYMBOL_TYPE (msymbol) == mst_text
3246 && STREQ (DEPRECATED_SYMBOL_NAME (msymbol), DEPRECATED_SYMBOL_NAME (msym)))
3254 /* the type of msym is correct (mst_solib_trampoline), but
3255 the unwind info is wrong, so set it to the correct value */
3256 u->stub_unwind.stub_type = EXPORT;
3258 /* the stub type info in the unwind is correct (this is not a
3259 trampoline), but the msym type information is wrong, it
3260 should be mst_text. So we need to fix the msym, and also
3261 get out of this function */
3263 MSYMBOL_TYPE (msym) = mst_text;
3264 return orig_pc == pc ? 0 : pc & ~0x3;
3268 /*--------------------------------------------------------------------------*/
3271 /* It's a stub. Search for a branch and figure out where it goes.
3272 Note we have to handle multi insn branch sequences like ldil;ble.
3273 Most (all?) other branches can be determined by examining the contents
3274 of certain registers and the stack. */
3281 /* Make sure we haven't walked outside the range of this stub. */
3282 if (u != find_unwind_entry (loc))
3284 warning ("Unable to find branch in linker stub");
3285 return orig_pc == pc ? 0 : pc & ~0x3;
3288 prev_inst = curr_inst;
3289 curr_inst = read_memory_integer (loc, 4);
3291 /* Does it look like a branch external using %r1? Then it's the
3292 branch from the stub to the actual function. */
3293 if ((curr_inst & 0xffe0e000) == 0xe0202000)
3295 /* Yup. See if the previous instruction loaded
3296 a value into %r1. If so compute and return the jump address. */
3297 if ((prev_inst & 0xffe00000) == 0x20200000)
3298 return (extract_21 (prev_inst) + extract_17 (curr_inst)) & ~0x3;
3301 warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1).");
3302 return orig_pc == pc ? 0 : pc & ~0x3;
3306 /* Does it look like a be 0(sr0,%r21)? OR
3307 Does it look like a be, n 0(sr0,%r21)? OR
3308 Does it look like a bve (r21)? (this is on PA2.0)
3309 Does it look like a bve, n(r21)? (this is also on PA2.0)
3310 That's the branch from an
3311 import stub to an export stub.
3313 It is impossible to determine the target of the branch via
3314 simple examination of instructions and/or data (consider
3315 that the address in the plabel may be the address of the
3316 bind-on-reference routine in the dynamic loader).
3318 So we have try an alternative approach.
3320 Get the name of the symbol at our current location; it should
3321 be a stub symbol with the same name as the symbol in the
3324 Then lookup a minimal symbol with the same name; we should
3325 get the minimal symbol for the target routine in the shared
3326 library as those take precedence of import/export stubs. */
3327 if ((curr_inst == 0xe2a00000) ||
3328 (curr_inst == 0xe2a00002) ||
3329 (curr_inst == 0xeaa0d000) ||
3330 (curr_inst == 0xeaa0d002))
3332 struct minimal_symbol *stubsym, *libsym;
3334 stubsym = lookup_minimal_symbol_by_pc (loc);
3335 if (stubsym == NULL)
3337 warning ("Unable to find symbol for 0x%lx", loc);
3338 return orig_pc == pc ? 0 : pc & ~0x3;
3341 libsym = lookup_minimal_symbol (DEPRECATED_SYMBOL_NAME (stubsym), NULL, NULL);
3344 warning ("Unable to find library symbol for %s\n",
3345 DEPRECATED_SYMBOL_NAME (stubsym));
3346 return orig_pc == pc ? 0 : pc & ~0x3;
3349 return SYMBOL_VALUE (libsym);
3352 /* Does it look like bl X,%rp or bl X,%r0? Another way to do a
3353 branch from the stub to the actual function. */
3355 else if ((curr_inst & 0xffe0e000) == 0xe8400000
3356 || (curr_inst & 0xffe0e000) == 0xe8000000
3357 || (curr_inst & 0xffe0e000) == 0xe800A000)
3358 return (loc + extract_17 (curr_inst) + 8) & ~0x3;
3360 /* Does it look like bv (rp)? Note this depends on the
3361 current stack pointer being the same as the stack
3362 pointer in the stub itself! This is a branch on from the
3363 stub back to the original caller. */
3364 /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */
3365 else if ((curr_inst & 0xffe0f000) == 0xe840c000)
3367 /* Yup. See if the previous instruction loaded
3369 if (prev_inst == 0x4bc23ff1)
3370 return (read_memory_integer
3371 (read_register (SP_REGNUM) - 8, 4)) & ~0x3;
3374 warning ("Unable to find restore of %%rp before bv (%%rp).");
3375 return orig_pc == pc ? 0 : pc & ~0x3;
3379 /* elz: added this case to capture the new instruction
3380 at the end of the return part of an export stub used by
3381 the PA2.0: BVE, n (rp) */
3382 else if ((curr_inst & 0xffe0f000) == 0xe840d000)
3384 return (read_memory_integer
3385 (read_register (SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3;
3388 /* What about be,n 0(sr0,%rp)? It's just another way we return to
3389 the original caller from the stub. Used in dynamic executables. */
3390 else if (curr_inst == 0xe0400002)
3392 /* The value we jump to is sitting in sp - 24. But that's
3393 loaded several instructions before the be instruction.
3394 I guess we could check for the previous instruction being
3395 mtsp %r1,%sr0 if we want to do sanity checking. */
3396 return (read_memory_integer
3397 (read_register (SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3;
3400 /* Haven't found the branch yet, but we're still in the stub.
3407 /* For the given instruction (INST), return any adjustment it makes
3408 to the stack pointer or zero for no adjustment.
3410 This only handles instructions commonly found in prologues. */
3413 prologue_inst_adjust_sp (unsigned long inst)
3415 /* This must persist across calls. */
3416 static int save_high21;
3418 /* The most common way to perform a stack adjustment ldo X(sp),sp */
3419 if ((inst & 0xffffc000) == 0x37de0000)
3420 return extract_14 (inst);
3423 if ((inst & 0xffe00000) == 0x6fc00000)
3424 return extract_14 (inst);
3426 /* std,ma X,D(sp) */
3427 if ((inst & 0xffe00008) == 0x73c00008)
3428 return (inst & 0x1 ? -1 << 13 : 0) | (((inst >> 4) & 0x3ff) << 3);
3430 /* addil high21,%r1; ldo low11,(%r1),%r30)
3431 save high bits in save_high21 for later use. */
3432 if ((inst & 0xffe00000) == 0x28200000)
3434 save_high21 = extract_21 (inst);
3438 if ((inst & 0xffff0000) == 0x343e0000)
3439 return save_high21 + extract_14 (inst);
3441 /* fstws as used by the HP compilers. */
3442 if ((inst & 0xffffffe0) == 0x2fd01220)
3443 return extract_5_load (inst);
3445 /* No adjustment. */
3449 /* Return nonzero if INST is a branch of some kind, else return zero. */
3452 is_branch (unsigned long inst)
3481 /* Return the register number for a GR which is saved by INST or
3482 zero it INST does not save a GR. */
3485 inst_saves_gr (unsigned long inst)
3487 /* Does it look like a stw? */
3488 if ((inst >> 26) == 0x1a || (inst >> 26) == 0x1b
3489 || (inst >> 26) == 0x1f
3490 || ((inst >> 26) == 0x1f
3491 && ((inst >> 6) == 0xa)))
3492 return extract_5R_store (inst);
3494 /* Does it look like a std? */
3495 if ((inst >> 26) == 0x1c
3496 || ((inst >> 26) == 0x03
3497 && ((inst >> 6) & 0xf) == 0xb))
3498 return extract_5R_store (inst);
3500 /* Does it look like a stwm? GCC & HPC may use this in prologues. */
3501 if ((inst >> 26) == 0x1b)
3502 return extract_5R_store (inst);
3504 /* Does it look like sth or stb? HPC versions 9.0 and later use these
3506 if ((inst >> 26) == 0x19 || (inst >> 26) == 0x18
3507 || ((inst >> 26) == 0x3
3508 && (((inst >> 6) & 0xf) == 0x8
3509 || (inst >> 6) & 0xf) == 0x9))
3510 return extract_5R_store (inst);
3515 /* Return the register number for a FR which is saved by INST or
3516 zero it INST does not save a FR.
3518 Note we only care about full 64bit register stores (that's the only
3519 kind of stores the prologue will use).
3521 FIXME: What about argument stores with the HP compiler in ANSI mode? */
3524 inst_saves_fr (unsigned long inst)
3526 /* is this an FSTD ? */
3527 if ((inst & 0xfc00dfc0) == 0x2c001200)
3528 return extract_5r_store (inst);
3529 if ((inst & 0xfc000002) == 0x70000002)
3530 return extract_5R_store (inst);
3531 /* is this an FSTW ? */
3532 if ((inst & 0xfc00df80) == 0x24001200)
3533 return extract_5r_store (inst);
3534 if ((inst & 0xfc000002) == 0x7c000000)
3535 return extract_5R_store (inst);
3539 /* Advance PC across any function entry prologue instructions
3540 to reach some "real" code.
3542 Use information in the unwind table to determine what exactly should
3543 be in the prologue. */
3547 skip_prologue_hard_way (CORE_ADDR pc)
3550 CORE_ADDR orig_pc = pc;
3551 unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp;
3552 unsigned long args_stored, status, i, restart_gr, restart_fr;
3553 struct unwind_table_entry *u;
3559 u = find_unwind_entry (pc);
3563 /* If we are not at the beginning of a function, then return now. */
3564 if ((pc & ~0x3) != u->region_start)
3567 /* This is how much of a frame adjustment we need to account for. */
3568 stack_remaining = u->Total_frame_size << 3;
3570 /* Magic register saves we want to know about. */
3571 save_rp = u->Save_RP;
3572 save_sp = u->Save_SP;
3574 /* An indication that args may be stored into the stack. Unfortunately
3575 the HPUX compilers tend to set this in cases where no args were
3579 /* Turn the Entry_GR field into a bitmask. */
3581 for (i = 3; i < u->Entry_GR + 3; i++)
3583 /* Frame pointer gets saved into a special location. */
3584 if (u->Save_SP && i == FP_REGNUM)
3587 save_gr |= (1 << i);
3589 save_gr &= ~restart_gr;
3591 /* Turn the Entry_FR field into a bitmask too. */
3593 for (i = 12; i < u->Entry_FR + 12; i++)
3594 save_fr |= (1 << i);
3595 save_fr &= ~restart_fr;
3597 /* Loop until we find everything of interest or hit a branch.
3599 For unoptimized GCC code and for any HP CC code this will never ever
3600 examine any user instructions.
3602 For optimzied GCC code we're faced with problems. GCC will schedule
3603 its prologue and make prologue instructions available for delay slot
3604 filling. The end result is user code gets mixed in with the prologue
3605 and a prologue instruction may be in the delay slot of the first branch
3608 Some unexpected things are expected with debugging optimized code, so
3609 we allow this routine to walk past user instructions in optimized
3611 while (save_gr || save_fr || save_rp || save_sp || stack_remaining > 0
3614 unsigned int reg_num;
3615 unsigned long old_stack_remaining, old_save_gr, old_save_fr;
3616 unsigned long old_save_rp, old_save_sp, next_inst;
3618 /* Save copies of all the triggers so we can compare them later
3620 old_save_gr = save_gr;
3621 old_save_fr = save_fr;
3622 old_save_rp = save_rp;
3623 old_save_sp = save_sp;
3624 old_stack_remaining = stack_remaining;
3626 status = target_read_memory (pc, buf, 4);
3627 inst = extract_unsigned_integer (buf, 4);
3633 /* Note the interesting effects of this instruction. */
3634 stack_remaining -= prologue_inst_adjust_sp (inst);
3636 /* There are limited ways to store the return pointer into the
3638 if (inst == 0x6bc23fd9 || inst == 0x0fc212c1)
3641 /* These are the only ways we save SP into the stack. At this time
3642 the HP compilers never bother to save SP into the stack. */
3643 if ((inst & 0xffffc000) == 0x6fc10000
3644 || (inst & 0xffffc00c) == 0x73c10008)
3647 /* Are we loading some register with an offset from the argument
3649 if ((inst & 0xffe00000) == 0x37a00000
3650 || (inst & 0xffffffe0) == 0x081d0240)
3656 /* Account for general and floating-point register saves. */
3657 reg_num = inst_saves_gr (inst);
3658 save_gr &= ~(1 << reg_num);
3660 /* Ugh. Also account for argument stores into the stack.
3661 Unfortunately args_stored only tells us that some arguments
3662 where stored into the stack. Not how many or what kind!
3664 This is a kludge as on the HP compiler sets this bit and it
3665 never does prologue scheduling. So once we see one, skip past
3666 all of them. We have similar code for the fp arg stores below.
3668 FIXME. Can still die if we have a mix of GR and FR argument
3670 if (reg_num >= (TARGET_PTR_BIT == 64 ? 19 : 23) && reg_num <= 26)
3672 while (reg_num >= (TARGET_PTR_BIT == 64 ? 19 : 23) && reg_num <= 26)
3675 status = target_read_memory (pc, buf, 4);
3676 inst = extract_unsigned_integer (buf, 4);
3679 reg_num = inst_saves_gr (inst);
3685 reg_num = inst_saves_fr (inst);
3686 save_fr &= ~(1 << reg_num);
3688 status = target_read_memory (pc + 4, buf, 4);
3689 next_inst = extract_unsigned_integer (buf, 4);
3695 /* We've got to be read to handle the ldo before the fp register
3697 if ((inst & 0xfc000000) == 0x34000000
3698 && inst_saves_fr (next_inst) >= 4
3699 && inst_saves_fr (next_inst) <= (TARGET_PTR_BIT == 64 ? 11 : 7))
3701 /* So we drop into the code below in a reasonable state. */
3702 reg_num = inst_saves_fr (next_inst);
3706 /* Ugh. Also account for argument stores into the stack.
3707 This is a kludge as on the HP compiler sets this bit and it
3708 never does prologue scheduling. So once we see one, skip past
3710 if (reg_num >= 4 && reg_num <= (TARGET_PTR_BIT == 64 ? 11 : 7))
3712 while (reg_num >= 4 && reg_num <= (TARGET_PTR_BIT == 64 ? 11 : 7))
3715 status = target_read_memory (pc, buf, 4);
3716 inst = extract_unsigned_integer (buf, 4);
3719 if ((inst & 0xfc000000) != 0x34000000)
3721 status = target_read_memory (pc + 4, buf, 4);
3722 next_inst = extract_unsigned_integer (buf, 4);
3725 reg_num = inst_saves_fr (next_inst);
3731 /* Quit if we hit any kind of branch. This can happen if a prologue
3732 instruction is in the delay slot of the first call/branch. */
3733 if (is_branch (inst))
3736 /* What a crock. The HP compilers set args_stored even if no
3737 arguments were stored into the stack (boo hiss). This could
3738 cause this code to then skip a bunch of user insns (up to the
3741 To combat this we try to identify when args_stored was bogusly
3742 set and clear it. We only do this when args_stored is nonzero,
3743 all other resources are accounted for, and nothing changed on
3746 && !(save_gr || save_fr || save_rp || save_sp || stack_remaining > 0)
3747 && old_save_gr == save_gr && old_save_fr == save_fr
3748 && old_save_rp == save_rp && old_save_sp == save_sp
3749 && old_stack_remaining == stack_remaining)
3756 /* We've got a tenative location for the end of the prologue. However
3757 because of limitations in the unwind descriptor mechanism we may
3758 have went too far into user code looking for the save of a register
3759 that does not exist. So, if there registers we expected to be saved
3760 but never were, mask them out and restart.
3762 This should only happen in optimized code, and should be very rare. */
3763 if (save_gr || (save_fr && !(restart_fr || restart_gr)))
3766 restart_gr = save_gr;
3767 restart_fr = save_fr;
3775 /* Return the address of the PC after the last prologue instruction if
3776 we can determine it from the debug symbols. Else return zero. */
3779 after_prologue (CORE_ADDR pc)
3781 struct symtab_and_line sal;
3782 CORE_ADDR func_addr, func_end;
3785 /* If we can not find the symbol in the partial symbol table, then
3786 there is no hope we can determine the function's start address
3788 if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end))
3791 /* Get the line associated with FUNC_ADDR. */
3792 sal = find_pc_line (func_addr, 0);
3794 /* There are only two cases to consider. First, the end of the source line
3795 is within the function bounds. In that case we return the end of the
3796 source line. Second is the end of the source line extends beyond the
3797 bounds of the current function. We need to use the slow code to
3798 examine instructions in that case.
3800 Anything else is simply a bug elsewhere. Fixing it here is absolutely
3801 the wrong thing to do. In fact, it should be entirely possible for this
3802 function to always return zero since the slow instruction scanning code
3803 is supposed to *always* work. If it does not, then it is a bug. */
3804 if (sal.end < func_end)
3810 /* To skip prologues, I use this predicate. Returns either PC itself
3811 if the code at PC does not look like a function prologue; otherwise
3812 returns an address that (if we're lucky) follows the prologue. If
3813 LENIENT, then we must skip everything which is involved in setting
3814 up the frame (it's OK to skip more, just so long as we don't skip
3815 anything which might clobber the registers which are being saved.
3816 Currently we must not skip more on the alpha, but we might the lenient
3820 hppa_skip_prologue (CORE_ADDR pc)
3824 CORE_ADDR post_prologue_pc;
3827 /* See if we can determine the end of the prologue via the symbol table.
3828 If so, then return either PC, or the PC after the prologue, whichever
3831 post_prologue_pc = after_prologue (pc);
3833 /* If after_prologue returned a useful address, then use it. Else
3834 fall back on the instruction skipping code.
3836 Some folks have claimed this causes problems because the breakpoint
3837 may be the first instruction of the prologue. If that happens, then
3838 the instruction skipping code has a bug that needs to be fixed. */
3839 if (post_prologue_pc != 0)
3840 return max (pc, post_prologue_pc);
3842 return (skip_prologue_hard_way (pc));
3845 /* Put here the code to store, into a struct frame_saved_regs,
3846 the addresses of the saved registers of frame described by FRAME_INFO.
3847 This includes special registers such as pc and fp saved in special
3848 ways in the stack frame. sp is even more special:
3849 the address we return for it IS the sp for the next frame. */
3852 hppa_frame_find_saved_regs (struct frame_info *frame_info,
3853 struct frame_saved_regs *frame_saved_regs)
3856 struct unwind_table_entry *u;
3857 unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp;
3861 int final_iteration;
3863 /* Zero out everything. */
3864 memset (frame_saved_regs, '\0', sizeof (struct frame_saved_regs));
3866 /* Call dummy frames always look the same, so there's no need to
3867 examine the dummy code to determine locations of saved registers;
3868 instead, let find_dummy_frame_regs fill in the correct offsets
3869 for the saved registers. */
3870 if ((frame_info->pc >= frame_info->frame
3871 && frame_info->pc <= (frame_info->frame
3872 /* A call dummy is sized in words, but it is
3873 actually a series of instructions. Account
3874 for that scaling factor. */
3875 + ((REGISTER_SIZE / INSTRUCTION_SIZE)
3876 * CALL_DUMMY_LENGTH)
3877 /* Similarly we have to account for 64bit
3878 wide register saves. */
3879 + (32 * REGISTER_SIZE)
3880 /* We always consider FP regs 8 bytes long. */
3881 + (NUM_REGS - FP0_REGNUM) * 8
3882 /* Similarly we have to account for 64bit
3883 wide register saves. */
3884 + (6 * REGISTER_SIZE))))
3885 find_dummy_frame_regs (frame_info, frame_saved_regs);
3887 /* Interrupt handlers are special too. They lay out the register
3888 state in the exact same order as the register numbers in GDB. */
3889 if (pc_in_interrupt_handler (frame_info->pc))
3891 for (i = 0; i < NUM_REGS; i++)
3893 /* SP is a little special. */
3895 frame_saved_regs->regs[SP_REGNUM]
3896 = read_memory_integer (frame_info->frame + SP_REGNUM * 4,
3897 TARGET_PTR_BIT / 8);
3899 frame_saved_regs->regs[i] = frame_info->frame + i * 4;
3904 #ifdef FRAME_FIND_SAVED_REGS_IN_SIGTRAMP
3905 /* Handle signal handler callers. */
3906 if ((get_frame_type (frame_info) == SIGTRAMP_FRAME))
3908 FRAME_FIND_SAVED_REGS_IN_SIGTRAMP (frame_info, frame_saved_regs);
3913 /* Get the starting address of the function referred to by the PC
3915 pc = get_frame_func (frame_info);
3918 u = find_unwind_entry (pc);
3922 /* This is how much of a frame adjustment we need to account for. */
3923 stack_remaining = u->Total_frame_size << 3;
3925 /* Magic register saves we want to know about. */
3926 save_rp = u->Save_RP;
3927 save_sp = u->Save_SP;
3929 /* Turn the Entry_GR field into a bitmask. */
3931 for (i = 3; i < u->Entry_GR + 3; i++)
3933 /* Frame pointer gets saved into a special location. */
3934 if (u->Save_SP && i == FP_REGNUM)
3937 save_gr |= (1 << i);
3940 /* Turn the Entry_FR field into a bitmask too. */
3942 for (i = 12; i < u->Entry_FR + 12; i++)
3943 save_fr |= (1 << i);
3945 /* The frame always represents the value of %sp at entry to the
3946 current function (and is thus equivalent to the "saved" stack
3948 frame_saved_regs->regs[SP_REGNUM] = frame_info->frame;
3950 /* Loop until we find everything of interest or hit a branch.
3952 For unoptimized GCC code and for any HP CC code this will never ever
3953 examine any user instructions.
3955 For optimized GCC code we're faced with problems. GCC will schedule
3956 its prologue and make prologue instructions available for delay slot
3957 filling. The end result is user code gets mixed in with the prologue
3958 and a prologue instruction may be in the delay slot of the first branch
3961 Some unexpected things are expected with debugging optimized code, so
3962 we allow this routine to walk past user instructions in optimized
3964 final_iteration = 0;
3965 while ((save_gr || save_fr || save_rp || save_sp || stack_remaining > 0)
3966 && pc <= frame_info->pc)
3968 status = target_read_memory (pc, buf, 4);
3969 inst = extract_unsigned_integer (buf, 4);
3975 /* Note the interesting effects of this instruction. */
3976 stack_remaining -= prologue_inst_adjust_sp (inst);
3978 /* There are limited ways to store the return pointer into the
3980 if (inst == 0x6bc23fd9) /* stw rp,-0x14(sr0,sp) */
3983 frame_saved_regs->regs[RP_REGNUM] = frame_info->frame - 20;
3985 else if (inst == 0x0fc212c1) /* std rp,-0x10(sr0,sp) */
3988 frame_saved_regs->regs[RP_REGNUM] = frame_info->frame - 16;
3991 /* Note if we saved SP into the stack. This also happens to indicate
3992 the location of the saved frame pointer. */
3993 if ( (inst & 0xffffc000) == 0x6fc10000 /* stw,ma r1,N(sr0,sp) */
3994 || (inst & 0xffffc00c) == 0x73c10008) /* std,ma r1,N(sr0,sp) */
3996 frame_saved_regs->regs[FP_REGNUM] = frame_info->frame;
4000 /* Account for general and floating-point register saves. */
4001 reg = inst_saves_gr (inst);
4002 if (reg >= 3 && reg <= 18
4003 && (!u->Save_SP || reg != FP_REGNUM))
4005 save_gr &= ~(1 << reg);
4007 /* stwm with a positive displacement is a *post modify*. */
4008 if ((inst >> 26) == 0x1b
4009 && extract_14 (inst) >= 0)
4010 frame_saved_regs->regs[reg] = frame_info->frame;
4011 /* A std has explicit post_modify forms. */
4012 else if ((inst & 0xfc00000c0) == 0x70000008)
4013 frame_saved_regs->regs[reg] = frame_info->frame;
4018 if ((inst >> 26) == 0x1c)
4019 offset = (inst & 0x1 ? -1 << 13 : 0) | (((inst >> 4) & 0x3ff) << 3);
4020 else if ((inst >> 26) == 0x03)
4021 offset = low_sign_extend (inst & 0x1f, 5);
4023 offset = extract_14 (inst);
4025 /* Handle code with and without frame pointers. */
4027 frame_saved_regs->regs[reg]
4028 = frame_info->frame + offset;
4030 frame_saved_regs->regs[reg]
4031 = (frame_info->frame + (u->Total_frame_size << 3)
4037 /* GCC handles callee saved FP regs a little differently.
4039 It emits an instruction to put the value of the start of
4040 the FP store area into %r1. It then uses fstds,ma with
4041 a basereg of %r1 for the stores.
4043 HP CC emits them at the current stack pointer modifying
4044 the stack pointer as it stores each register. */
4046 /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */
4047 if ((inst & 0xffffc000) == 0x34610000
4048 || (inst & 0xffffc000) == 0x37c10000)
4049 fp_loc = extract_14 (inst);
4051 reg = inst_saves_fr (inst);
4052 if (reg >= 12 && reg <= 21)
4054 /* Note +4 braindamage below is necessary because the FP status
4055 registers are internally 8 registers rather than the expected
4057 save_fr &= ~(1 << reg);
4060 /* 1st HP CC FP register store. After this instruction
4061 we've set enough state that the GCC and HPCC code are
4062 both handled in the same manner. */
4063 frame_saved_regs->regs[reg + FP4_REGNUM + 4] = frame_info->frame;
4068 frame_saved_regs->regs[reg + FP0_REGNUM + 4]
4069 = frame_info->frame + fp_loc;
4074 /* Quit if we hit any kind of branch the previous iteration. */
4075 if (final_iteration)
4078 /* We want to look precisely one instruction beyond the branch
4079 if we have not found everything yet. */
4080 if (is_branch (inst))
4081 final_iteration = 1;
4089 /* Exception handling support for the HP-UX ANSI C++ compiler.
4090 The compiler (aCC) provides a callback for exception events;
4091 GDB can set a breakpoint on this callback and find out what
4092 exception event has occurred. */
4094 /* The name of the hook to be set to point to the callback function */
4095 static char HP_ACC_EH_notify_hook[] = "__eh_notify_hook";
4096 /* The name of the function to be used to set the hook value */
4097 static char HP_ACC_EH_set_hook_value[] = "__eh_set_hook_value";
4098 /* The name of the callback function in end.o */
4099 static char HP_ACC_EH_notify_callback[] = "__d_eh_notify_callback";
4100 /* Name of function in end.o on which a break is set (called by above) */
4101 static char HP_ACC_EH_break[] = "__d_eh_break";
4102 /* Name of flag (in end.o) that enables catching throws */
4103 static char HP_ACC_EH_catch_throw[] = "__d_eh_catch_throw";
4104 /* Name of flag (in end.o) that enables catching catching */
4105 static char HP_ACC_EH_catch_catch[] = "__d_eh_catch_catch";
4106 /* The enum used by aCC */
4114 /* Is exception-handling support available with this executable? */
4115 static int hp_cxx_exception_support = 0;
4116 /* Has the initialize function been run? */
4117 int hp_cxx_exception_support_initialized = 0;
4118 /* Similar to above, but imported from breakpoint.c -- non-target-specific */
4119 extern int exception_support_initialized;
4120 /* Address of __eh_notify_hook */
4121 static CORE_ADDR eh_notify_hook_addr = 0;
4122 /* Address of __d_eh_notify_callback */
4123 static CORE_ADDR eh_notify_callback_addr = 0;
4124 /* Address of __d_eh_break */
4125 static CORE_ADDR eh_break_addr = 0;
4126 /* Address of __d_eh_catch_catch */
4127 static CORE_ADDR eh_catch_catch_addr = 0;
4128 /* Address of __d_eh_catch_throw */
4129 static CORE_ADDR eh_catch_throw_addr = 0;
4130 /* Sal for __d_eh_break */
4131 static struct symtab_and_line *break_callback_sal = 0;
4133 /* Code in end.c expects __d_pid to be set in the inferior,
4134 otherwise __d_eh_notify_callback doesn't bother to call
4135 __d_eh_break! So we poke the pid into this symbol
4140 setup_d_pid_in_inferior (void)
4143 struct minimal_symbol *msymbol;
4144 char buf[4]; /* FIXME 32x64? */
4146 /* Slam the pid of the process into __d_pid; failing is only a warning! */
4147 msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile);
4148 if (msymbol == NULL)
4150 warning ("Unable to find __d_pid symbol in object file.");
4151 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
4155 anaddr = SYMBOL_VALUE_ADDRESS (msymbol);
4156 store_unsigned_integer (buf, 4, PIDGET (inferior_ptid)); /* FIXME 32x64? */
4157 if (target_write_memory (anaddr, buf, 4)) /* FIXME 32x64? */
4159 warning ("Unable to write __d_pid");
4160 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
4166 /* Initialize exception catchpoint support by looking for the
4167 necessary hooks/callbacks in end.o, etc., and set the hook value to
4168 point to the required debug function
4174 initialize_hp_cxx_exception_support (void)
4176 struct symtabs_and_lines sals;
4177 struct cleanup *old_chain;
4178 struct cleanup *canonical_strings_chain = NULL;
4181 char *addr_end = NULL;
4182 char **canonical = (char **) NULL;
4184 struct symbol *sym = NULL;
4185 struct minimal_symbol *msym = NULL;
4186 struct objfile *objfile;
4187 asection *shlib_info;
4189 /* Detect and disallow recursion. On HP-UX with aCC, infinite
4190 recursion is a possibility because finding the hook for exception
4191 callbacks involves making a call in the inferior, which means
4192 re-inserting breakpoints which can re-invoke this code */
4194 static int recurse = 0;
4197 hp_cxx_exception_support_initialized = 0;
4198 exception_support_initialized = 0;
4202 hp_cxx_exception_support = 0;
4204 /* First check if we have seen any HP compiled objects; if not,
4205 it is very unlikely that HP's idiosyncratic callback mechanism
4206 for exception handling debug support will be available!
4207 This will percolate back up to breakpoint.c, where our callers
4208 will decide to try the g++ exception-handling support instead. */
4209 if (!hp_som_som_object_present)
4212 /* We have a SOM executable with SOM debug info; find the hooks */
4214 /* First look for the notify hook provided by aCC runtime libs */
4215 /* If we find this symbol, we conclude that the executable must
4216 have HP aCC exception support built in. If this symbol is not
4217 found, even though we're a HP SOM-SOM file, we may have been
4218 built with some other compiler (not aCC). This results percolates
4219 back up to our callers in breakpoint.c which can decide to
4220 try the g++ style of exception support instead.
4221 If this symbol is found but the other symbols we require are
4222 not found, there is something weird going on, and g++ support
4223 should *not* be tried as an alternative.
4225 ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined.
4226 ASSUMPTION: HP aCC and g++ modules cannot be linked together. */
4228 /* libCsup has this hook; it'll usually be non-debuggable */
4229 msym = lookup_minimal_symbol (HP_ACC_EH_notify_hook, NULL, NULL);
4232 eh_notify_hook_addr = SYMBOL_VALUE_ADDRESS (msym);
4233 hp_cxx_exception_support = 1;
4237 warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook);
4238 warning ("Executable may not have been compiled debuggable with HP aCC.");
4239 warning ("GDB will be unable to intercept exception events.");
4240 eh_notify_hook_addr = 0;
4241 hp_cxx_exception_support = 0;
4245 /* Next look for the notify callback routine in end.o */
4246 /* This is always available in the SOM symbol dictionary if end.o is linked in */
4247 msym = lookup_minimal_symbol (HP_ACC_EH_notify_callback, NULL, NULL);
4250 eh_notify_callback_addr = SYMBOL_VALUE_ADDRESS (msym);
4251 hp_cxx_exception_support = 1;
4255 warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback);
4256 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
4257 warning ("GDB will be unable to intercept exception events.");
4258 eh_notify_callback_addr = 0;
4262 #ifndef GDB_TARGET_IS_HPPA_20W
4263 /* Check whether the executable is dynamically linked or archive bound */
4264 /* With an archive-bound executable we can use the raw addresses we find
4265 for the callback function, etc. without modification. For an executable
4266 with shared libraries, we have to do more work to find the plabel, which
4267 can be the target of a call through $$dyncall from the aCC runtime support
4268 library (libCsup) which is linked shared by default by aCC. */
4269 /* This test below was copied from somsolib.c/somread.c. It may not be a very
4270 reliable one to test that an executable is linked shared. pai/1997-07-18 */
4271 shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$");
4272 if (shlib_info && (bfd_section_size (symfile_objfile->obfd, shlib_info) != 0))
4274 /* The minsym we have has the local code address, but that's not the
4275 plabel that can be used by an inter-load-module call. */
4276 /* Find solib handle for main image (which has end.o), and use that
4277 and the min sym as arguments to __d_shl_get() (which does the equivalent
4278 of shl_findsym()) to find the plabel. */
4280 args_for_find_stub args;
4281 static char message[] = "Error while finding exception callback hook:\n";
4283 args.solib_handle = som_solib_get_solib_by_pc (eh_notify_callback_addr);
4285 args.return_val = 0;
4288 catch_errors (cover_find_stub_with_shl_get, &args, message,
4290 eh_notify_callback_addr = args.return_val;
4293 exception_catchpoints_are_fragile = 1;
4295 if (!eh_notify_callback_addr)
4297 /* We can get here either if there is no plabel in the export list
4298 for the main image, or if something strange happened (?) */
4299 warning ("Couldn't find a plabel (indirect function label) for the exception callback.");
4300 warning ("GDB will not be able to intercept exception events.");
4305 exception_catchpoints_are_fragile = 0;
4308 /* Now, look for the breakpointable routine in end.o */
4309 /* This should also be available in the SOM symbol dict. if end.o linked in */
4310 msym = lookup_minimal_symbol (HP_ACC_EH_break, NULL, NULL);
4313 eh_break_addr = SYMBOL_VALUE_ADDRESS (msym);
4314 hp_cxx_exception_support = 1;
4318 warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break);
4319 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
4320 warning ("GDB will be unable to intercept exception events.");
4325 /* Next look for the catch enable flag provided in end.o */
4326 sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL,
4327 VAR_NAMESPACE, 0, (struct symtab **) NULL);
4328 if (sym) /* sometimes present in debug info */
4330 eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (sym);
4331 hp_cxx_exception_support = 1;
4334 /* otherwise look in SOM symbol dict. */
4336 msym = lookup_minimal_symbol (HP_ACC_EH_catch_catch, NULL, NULL);
4339 eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (msym);
4340 hp_cxx_exception_support = 1;
4344 warning ("Unable to enable interception of exception catches.");
4345 warning ("Executable may not have been compiled debuggable with HP aCC.");
4346 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
4351 /* Next look for the catch enable flag provided end.o */
4352 sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL,
4353 VAR_NAMESPACE, 0, (struct symtab **) NULL);
4354 if (sym) /* sometimes present in debug info */
4356 eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (sym);
4357 hp_cxx_exception_support = 1;
4360 /* otherwise look in SOM symbol dict. */
4362 msym = lookup_minimal_symbol (HP_ACC_EH_catch_throw, NULL, NULL);
4365 eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (msym);
4366 hp_cxx_exception_support = 1;
4370 warning ("Unable to enable interception of exception throws.");
4371 warning ("Executable may not have been compiled debuggable with HP aCC.");
4372 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
4378 hp_cxx_exception_support = 2; /* everything worked so far */
4379 hp_cxx_exception_support_initialized = 1;
4380 exception_support_initialized = 1;
4385 /* Target operation for enabling or disabling interception of
4387 KIND is either EX_EVENT_THROW or EX_EVENT_CATCH
4388 ENABLE is either 0 (disable) or 1 (enable).
4389 Return value is NULL if no support found;
4390 -1 if something went wrong,
4391 or a pointer to a symtab/line struct if the breakpointable
4392 address was found. */
4394 struct symtab_and_line *
4395 child_enable_exception_callback (enum exception_event_kind kind, int enable)
4399 if (!exception_support_initialized || !hp_cxx_exception_support_initialized)
4400 if (!initialize_hp_cxx_exception_support ())
4403 switch (hp_cxx_exception_support)
4406 /* Assuming no HP support at all */
4409 /* HP support should be present, but something went wrong */
4410 return (struct symtab_and_line *) -1; /* yuck! */
4411 /* there may be other cases in the future */
4414 /* Set the EH hook to point to the callback routine */
4415 store_unsigned_integer (buf, 4, enable ? eh_notify_callback_addr : 0); /* FIXME 32x64 problem */
4416 /* pai: (temp) FIXME should there be a pack operation first? */
4417 if (target_write_memory (eh_notify_hook_addr, buf, 4)) /* FIXME 32x64 problem */
4419 warning ("Could not write to target memory for exception event callback.");
4420 warning ("Interception of exception events may not work.");
4421 return (struct symtab_and_line *) -1;
4425 /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */
4426 if (PIDGET (inferior_ptid) > 0)
4428 if (setup_d_pid_in_inferior ())
4429 return (struct symtab_and_line *) -1;
4433 warning ("Internal error: Invalid inferior pid? Cannot intercept exception events.");
4434 return (struct symtab_and_line *) -1;
4440 case EX_EVENT_THROW:
4441 store_unsigned_integer (buf, 4, enable ? 1 : 0);
4442 if (target_write_memory (eh_catch_throw_addr, buf, 4)) /* FIXME 32x64? */
4444 warning ("Couldn't enable exception throw interception.");
4445 return (struct symtab_and_line *) -1;
4448 case EX_EVENT_CATCH:
4449 store_unsigned_integer (buf, 4, enable ? 1 : 0);
4450 if (target_write_memory (eh_catch_catch_addr, buf, 4)) /* FIXME 32x64? */
4452 warning ("Couldn't enable exception catch interception.");
4453 return (struct symtab_and_line *) -1;
4457 error ("Request to enable unknown or unsupported exception event.");
4460 /* Copy break address into new sal struct, malloc'ing if needed. */
4461 if (!break_callback_sal)
4463 break_callback_sal = (struct symtab_and_line *) xmalloc (sizeof (struct symtab_and_line));
4465 init_sal (break_callback_sal);
4466 break_callback_sal->symtab = NULL;
4467 break_callback_sal->pc = eh_break_addr;
4468 break_callback_sal->line = 0;
4469 break_callback_sal->end = eh_break_addr;
4471 return break_callback_sal;
4474 /* Record some information about the current exception event */
4475 static struct exception_event_record current_ex_event;
4476 /* Convenience struct */
4477 static struct symtab_and_line null_symtab_and_line =
4480 /* Report current exception event. Returns a pointer to a record
4481 that describes the kind of the event, where it was thrown from,
4482 and where it will be caught. More information may be reported
4484 struct exception_event_record *
4485 child_get_current_exception_event (void)
4487 CORE_ADDR event_kind;
4488 CORE_ADDR throw_addr;
4489 CORE_ADDR catch_addr;
4490 struct frame_info *fi, *curr_frame;
4493 curr_frame = get_current_frame ();
4495 return (struct exception_event_record *) NULL;
4497 /* Go up one frame to __d_eh_notify_callback, because at the
4498 point when this code is executed, there's garbage in the
4499 arguments of __d_eh_break. */
4500 fi = find_relative_frame (curr_frame, &level);
4502 return (struct exception_event_record *) NULL;
4506 /* Read in the arguments */
4507 /* __d_eh_notify_callback() is called with 3 arguments:
4508 1. event kind catch or throw
4509 2. the target address if known
4510 3. a flag -- not sure what this is. pai/1997-07-17 */
4511 event_kind = read_register (ARG0_REGNUM);
4512 catch_addr = read_register (ARG1_REGNUM);
4514 /* Now go down to a user frame */
4515 /* For a throw, __d_eh_break is called by
4516 __d_eh_notify_callback which is called by
4517 __notify_throw which is called
4519 For a catch, __d_eh_break is called by
4520 __d_eh_notify_callback which is called by
4521 <stackwalking stuff> which is called by
4522 __throw__<stuff> or __rethrow_<stuff> which is called
4524 /* FIXME: Don't use such magic numbers; search for the frames */
4525 level = (event_kind == EX_EVENT_THROW) ? 3 : 4;
4526 fi = find_relative_frame (curr_frame, &level);
4528 return (struct exception_event_record *) NULL;
4531 throw_addr = fi->pc;
4533 /* Go back to original (top) frame */
4534 select_frame (curr_frame);
4536 current_ex_event.kind = (enum exception_event_kind) event_kind;
4537 current_ex_event.throw_sal = find_pc_line (throw_addr, 1);
4538 current_ex_event.catch_sal = find_pc_line (catch_addr, 1);
4540 return ¤t_ex_event;
4543 /* Instead of this nasty cast, add a method pvoid() that prints out a
4544 host VOID data type (remember %p isn't portable). */
4547 hppa_pointer_to_address_hack (void *ptr)
4549 gdb_assert (sizeof (ptr) == TYPE_LENGTH (builtin_type_void_data_ptr));
4550 return POINTER_TO_ADDRESS (builtin_type_void_data_ptr, &ptr);
4554 unwind_command (char *exp, int from_tty)
4557 struct unwind_table_entry *u;
4559 /* If we have an expression, evaluate it and use it as the address. */
4561 if (exp != 0 && *exp != 0)
4562 address = parse_and_eval_address (exp);
4566 u = find_unwind_entry (address);
4570 printf_unfiltered ("Can't find unwind table entry for %s\n", exp);
4574 printf_unfiltered ("unwind_table_entry (0x%s):\n",
4575 paddr_nz (hppa_pointer_to_address_hack (u)));
4577 printf_unfiltered ("\tregion_start = ");
4578 print_address (u->region_start, gdb_stdout);
4580 printf_unfiltered ("\n\tregion_end = ");
4581 print_address (u->region_end, gdb_stdout);
4583 #define pif(FLD) if (u->FLD) printf_unfiltered (" "#FLD);
4585 printf_unfiltered ("\n\tflags =");
4586 pif (Cannot_unwind);
4588 pif (Millicode_save_sr0);
4591 pif (Variable_Frame);
4592 pif (Separate_Package_Body);
4593 pif (Frame_Extension_Millicode);
4594 pif (Stack_Overflow_Check);
4595 pif (Two_Instruction_SP_Increment);
4599 pif (Save_MRP_in_frame);
4600 pif (extn_ptr_defined);
4601 pif (Cleanup_defined);
4602 pif (MPE_XL_interrupt_marker);
4603 pif (HP_UX_interrupt_marker);
4606 putchar_unfiltered ('\n');
4608 #define pin(FLD) printf_unfiltered ("\t"#FLD" = 0x%x\n", u->FLD);
4610 pin (Region_description);
4613 pin (Total_frame_size);
4616 #ifdef PREPARE_TO_PROCEED
4618 /* If the user has switched threads, and there is a breakpoint
4619 at the old thread's pc location, then switch to that thread
4620 and return TRUE, else return FALSE and don't do a thread
4621 switch (or rather, don't seem to have done a thread switch).
4623 Ptrace-based gdb will always return FALSE to the thread-switch
4624 query, and thus also to PREPARE_TO_PROCEED.
4626 The important thing is whether there is a BPT instruction,
4627 not how many user breakpoints there are. So we have to worry
4628 about things like these:
4632 o User hits bp, no switch -- NO
4634 o User hits bp, switches threads -- YES
4636 o User hits bp, deletes bp, switches threads -- NO
4638 o User hits bp, deletes one of two or more bps
4639 at that PC, user switches threads -- YES
4641 o Plus, since we're buffering events, the user may have hit a
4642 breakpoint, deleted the breakpoint and then gotten another
4643 hit on that same breakpoint on another thread which
4644 actually hit before the delete. (FIXME in breakpoint.c
4645 so that "dead" breakpoints are ignored?) -- NO
4647 For these reasons, we have to violate information hiding and
4648 call "breakpoint_here_p". If core gdb thinks there is a bpt
4649 here, that's what counts, as core gdb is the one which is
4650 putting the BPT instruction in and taking it out.
4652 Note that this implementation is potentially redundant now that
4653 default_prepare_to_proceed() has been added.
4655 FIXME This may not support switching threads after Ctrl-C
4656 correctly. The default implementation does support this. */
4658 hppa_prepare_to_proceed (void)
4661 pid_t current_thread;
4663 old_thread = hppa_switched_threads (PIDGET (inferior_ptid));
4664 if (old_thread != 0)
4666 /* Switched over from "old_thread". Try to do
4667 as little work as possible, 'cause mostly
4668 we're going to switch back. */
4670 CORE_ADDR old_pc = read_pc ();
4672 /* Yuk, shouldn't use global to specify current
4673 thread. But that's how gdb does it. */
4674 current_thread = PIDGET (inferior_ptid);
4675 inferior_ptid = pid_to_ptid (old_thread);
4677 new_pc = read_pc ();
4678 if (new_pc != old_pc /* If at same pc, no need */
4679 && breakpoint_here_p (new_pc))
4681 /* User hasn't deleted the BP.
4682 Return TRUE, finishing switch to "old_thread". */
4683 flush_cached_frames ();
4684 registers_changed ();
4686 printf ("---> PREPARE_TO_PROCEED (was %d, now %d)!\n",
4687 current_thread, PIDGET (inferior_ptid));
4693 /* Otherwise switch back to the user-chosen thread. */
4694 inferior_ptid = pid_to_ptid (current_thread);
4695 new_pc = read_pc (); /* Re-prime register cache */
4700 #endif /* PREPARE_TO_PROCEED */
4703 hppa_skip_permanent_breakpoint (void)
4705 /* To step over a breakpoint instruction on the PA takes some
4706 fiddling with the instruction address queue.
4708 When we stop at a breakpoint, the IA queue front (the instruction
4709 we're executing now) points at the breakpoint instruction, and
4710 the IA queue back (the next instruction to execute) points to
4711 whatever instruction we would execute after the breakpoint, if it
4712 were an ordinary instruction. This is the case even if the
4713 breakpoint is in the delay slot of a branch instruction.
4715 Clearly, to step past the breakpoint, we need to set the queue
4716 front to the back. But what do we put in the back? What
4717 instruction comes after that one? Because of the branch delay
4718 slot, the next insn is always at the back + 4. */
4719 write_register (PCOQ_HEAD_REGNUM, read_register (PCOQ_TAIL_REGNUM));
4720 write_register (PCSQ_HEAD_REGNUM, read_register (PCSQ_TAIL_REGNUM));
4722 write_register (PCOQ_TAIL_REGNUM, read_register (PCOQ_TAIL_REGNUM) + 4);
4723 /* We can leave the tail's space the same, since there's no jump. */
4726 /* Copy the function value from VALBUF into the proper location
4727 for a function return.
4729 Called only in the context of the "return" command. */
4732 hppa_store_return_value (struct type *type, char *valbuf)
4734 /* For software floating point, the return value goes into the
4735 integer registers. But we do not have any flag to key this on,
4736 so we always store the value into the integer registers.
4738 If its a float value, then we also store it into the floating
4740 deprecated_write_register_bytes (REGISTER_BYTE (28)
4741 + (TYPE_LENGTH (type) > 4
4742 ? (8 - TYPE_LENGTH (type))
4743 : (4 - TYPE_LENGTH (type))),
4744 valbuf, TYPE_LENGTH (type));
4745 if (! SOFT_FLOAT && TYPE_CODE (type) == TYPE_CODE_FLT)
4746 deprecated_write_register_bytes (REGISTER_BYTE (FP4_REGNUM),
4747 valbuf, TYPE_LENGTH (type));
4750 /* Copy the function's return value into VALBUF.
4752 This function is called only in the context of "target function calls",
4753 ie. when the debugger forces a function to be called in the child, and
4754 when the debugger forces a fucntion to return prematurely via the
4755 "return" command. */
4758 hppa_extract_return_value (struct type *type, char *regbuf, char *valbuf)
4760 if (! SOFT_FLOAT && TYPE_CODE (type) == TYPE_CODE_FLT)
4762 (char *)regbuf + REGISTER_BYTE (FP4_REGNUM),
4763 TYPE_LENGTH (type));
4767 + REGISTER_BYTE (28)
4768 + (TYPE_LENGTH (type) > 4
4769 ? (8 - TYPE_LENGTH (type))
4770 : (4 - TYPE_LENGTH (type)))),
4771 TYPE_LENGTH (type));
4775 hppa_reg_struct_has_addr (int gcc_p, struct type *type)
4777 /* On the PA, any pass-by-value structure > 8 bytes is actually passed
4778 via a pointer regardless of its type or the compiler used. */
4779 return (TYPE_LENGTH (type) > 8);
4783 hppa_inner_than (CORE_ADDR lhs, CORE_ADDR rhs)
4785 /* Stack grows upward */
4790 hppa_stack_align (CORE_ADDR sp)
4792 /* elz: adjust the quantity to the next highest value which is
4793 64-bit aligned. This is used in valops.c, when the sp is adjusted.
4794 On hppa the sp must always be kept 64-bit aligned */
4795 return ((sp % 8) ? (sp + 7) & -8 : sp);
4799 hppa_pc_requires_run_before_use (CORE_ADDR pc)
4801 /* Sometimes we may pluck out a minimal symbol that has a negative address.
4803 An example of this occurs when an a.out is linked against a foo.sl.
4804 The foo.sl defines a global bar(), and the a.out declares a signature
4805 for bar(). However, the a.out doesn't directly call bar(), but passes
4806 its address in another call.
4808 If you have this scenario and attempt to "break bar" before running,
4809 gdb will find a minimal symbol for bar() in the a.out. But that
4810 symbol's address will be negative. What this appears to denote is
4811 an index backwards from the base of the procedure linkage table (PLT)
4812 into the data linkage table (DLT), the end of which is contiguous
4813 with the start of the PLT. This is clearly not a valid address for
4814 us to set a breakpoint on.
4816 Note that one must be careful in how one checks for a negative address.
4817 0xc0000000 is a legitimate address of something in a shared text
4818 segment, for example. Since I don't know what the possible range
4819 is of these "really, truly negative" addresses that come from the
4820 minimal symbols, I'm resorting to the gross hack of checking the
4821 top byte of the address for all 1's. Sigh. */
4823 return (!target_has_stack && (pc & 0xFF000000));
4827 hppa_instruction_nullified (void)
4829 /* brobecker 2002/11/07: Couldn't we use a ULONGEST here? It would
4830 avoid the type cast. I'm leaving it as is for now as I'm doing
4831 semi-mechanical multiarching-related changes. */
4832 const int ipsw = (int) read_register (IPSW_REGNUM);
4833 const int flags = (int) read_register (FLAGS_REGNUM);
4835 return ((ipsw & 0x00200000) && !(flags & 0x2));
4839 hppa_register_raw_size (int reg_nr)
4841 /* All registers have the same size. */
4842 return REGISTER_SIZE;
4845 /* Index within the register vector of the first byte of the space i
4846 used for register REG_NR. */
4849 hppa_register_byte (int reg_nr)
4854 /* Return the GDB type object for the "standard" data type of data
4858 hppa_register_virtual_type (int reg_nr)
4860 if (reg_nr < FP4_REGNUM)
4861 return builtin_type_int;
4863 return builtin_type_float;
4866 /* Store the address of the place in which to copy the structure the
4867 subroutine will return. This is called from call_function. */
4870 hppa_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
4872 write_register (28, addr);
4876 hppa_extract_struct_value_address (char *regbuf)
4878 /* Extract from an array REGBUF containing the (raw) register state
4879 the address in which a function should return its structure value,
4880 as a CORE_ADDR (or an expression that can be used as one). */
4881 /* FIXME: brobecker 2002-12-26.
4882 The current implementation is historical, but we should eventually
4883 implement it in a more robust manner as it relies on the fact that
4884 the address size is equal to the size of an int* _on the host_...
4885 One possible implementation that crossed my mind is to use
4887 return (*(int *)(regbuf + REGISTER_BYTE (28)));
4890 /* Return True if REGNUM is not a register available to the user
4891 through ptrace(). */
4894 hppa_cannot_store_register (int regnum)
4897 || regnum == PCSQ_HEAD_REGNUM
4898 || (regnum >= PCSQ_TAIL_REGNUM && regnum < IPSW_REGNUM)
4899 || (regnum > IPSW_REGNUM && regnum < FP4_REGNUM));
4904 hppa_frame_args_address (struct frame_info *fi)
4910 hppa_frame_locals_address (struct frame_info *fi)
4916 hppa_frame_num_args (struct frame_info *frame)
4918 /* We can't tell how many args there are now that the C compiler delays
4924 hppa_smash_text_address (CORE_ADDR addr)
4926 /* The low two bits of the PC on the PA contain the privilege level.
4927 Some genius implementing a (non-GCC) compiler apparently decided
4928 this means that "addresses" in a text section therefore include a
4929 privilege level, and thus symbol tables should contain these bits.
4930 This seems like a bonehead thing to do--anyway, it seems to work
4931 for our purposes to just ignore those bits. */
4933 return (addr &= ~0x3);
4936 static struct gdbarch *
4937 hppa_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
4939 struct gdbarch *gdbarch;
4941 /* Try to determine the ABI of the object we are loading. */
4942 if (info.abfd != NULL && info.osabi == GDB_OSABI_UNKNOWN)
4944 /* If it's a SOM file, assume it's HP/UX SOM. */
4945 if (bfd_get_flavour (info.abfd) == bfd_target_som_flavour)
4946 info.osabi = GDB_OSABI_HPUX_SOM;
4949 /* find a candidate among the list of pre-declared architectures. */
4950 arches = gdbarch_list_lookup_by_info (arches, &info);
4952 return (arches->gdbarch);
4954 /* If none found, then allocate and initialize one. */
4955 gdbarch = gdbarch_alloc (&info, NULL);
4957 /* Hook in ABI-specific overrides, if they have been registered. */
4958 gdbarch_init_osabi (info, gdbarch);
4960 set_gdbarch_reg_struct_has_addr (gdbarch, hppa_reg_struct_has_addr);
4961 set_gdbarch_function_start_offset (gdbarch, 0);
4962 set_gdbarch_skip_prologue (gdbarch, hppa_skip_prologue);
4963 set_gdbarch_skip_trampoline_code (gdbarch, hppa_skip_trampoline_code);
4964 set_gdbarch_in_solib_call_trampoline (gdbarch, hppa_in_solib_call_trampoline);
4965 set_gdbarch_in_solib_return_trampoline (gdbarch,
4966 hppa_in_solib_return_trampoline);
4967 set_gdbarch_saved_pc_after_call (gdbarch, hppa_saved_pc_after_call);
4968 set_gdbarch_inner_than (gdbarch, hppa_inner_than);
4969 set_gdbarch_stack_align (gdbarch, hppa_stack_align);
4970 set_gdbarch_decr_pc_after_break (gdbarch, 0);
4971 set_gdbarch_register_size (gdbarch, 4);
4972 set_gdbarch_num_regs (gdbarch, hppa_num_regs);
4973 set_gdbarch_fp_regnum (gdbarch, 3);
4974 set_gdbarch_sp_regnum (gdbarch, 30);
4975 set_gdbarch_fp0_regnum (gdbarch, 64);
4976 set_gdbarch_pc_regnum (gdbarch, PCOQ_HEAD_REGNUM);
4977 set_gdbarch_npc_regnum (gdbarch, PCOQ_TAIL_REGNUM);
4978 set_gdbarch_register_raw_size (gdbarch, hppa_register_raw_size);
4979 set_gdbarch_register_bytes (gdbarch, hppa_num_regs * 4);
4980 set_gdbarch_register_byte (gdbarch, hppa_register_byte);
4981 set_gdbarch_register_virtual_size (gdbarch, hppa_register_raw_size);
4982 set_gdbarch_deprecated_max_register_raw_size (gdbarch, 4);
4983 set_gdbarch_deprecated_max_register_virtual_size (gdbarch, 8);
4984 set_gdbarch_register_virtual_type (gdbarch, hppa_register_virtual_type);
4985 set_gdbarch_deprecated_store_struct_return (gdbarch, hppa_store_struct_return);
4986 set_gdbarch_deprecated_extract_return_value (gdbarch,
4987 hppa_extract_return_value);
4988 set_gdbarch_use_struct_convention (gdbarch, hppa_use_struct_convention);
4989 set_gdbarch_deprecated_store_return_value (gdbarch, hppa_store_return_value);
4990 set_gdbarch_deprecated_extract_struct_value_address
4991 (gdbarch, hppa_extract_struct_value_address);
4992 set_gdbarch_cannot_store_register (gdbarch, hppa_cannot_store_register);
4993 set_gdbarch_deprecated_init_extra_frame_info (gdbarch, hppa_init_extra_frame_info);
4994 set_gdbarch_deprecated_frame_chain (gdbarch, hppa_frame_chain);
4995 set_gdbarch_deprecated_frame_chain_valid (gdbarch, hppa_frame_chain_valid);
4996 set_gdbarch_frameless_function_invocation
4997 (gdbarch, hppa_frameless_function_invocation);
4998 set_gdbarch_deprecated_frame_saved_pc (gdbarch, hppa_frame_saved_pc);
4999 set_gdbarch_frame_args_address (gdbarch, hppa_frame_args_address);
5000 set_gdbarch_frame_locals_address (gdbarch, hppa_frame_locals_address);
5001 set_gdbarch_frame_num_args (gdbarch, hppa_frame_num_args);
5002 set_gdbarch_frame_args_skip (gdbarch, 0);
5003 set_gdbarch_deprecated_push_dummy_frame (gdbarch, hppa_push_dummy_frame);
5004 set_gdbarch_deprecated_pop_frame (gdbarch, hppa_pop_frame);
5005 set_gdbarch_call_dummy_length (gdbarch, INSTRUCTION_SIZE * 28);
5006 /* set_gdbarch_fix_call_dummy (gdbarch, hppa_fix_call_dummy); */
5007 set_gdbarch_deprecated_push_arguments (gdbarch, hppa_push_arguments);
5008 set_gdbarch_smash_text_address (gdbarch, hppa_smash_text_address);
5009 set_gdbarch_believe_pcc_promotion (gdbarch, 1);
5010 set_gdbarch_read_pc (gdbarch, hppa_target_read_pc);
5011 set_gdbarch_write_pc (gdbarch, hppa_target_write_pc);
5012 set_gdbarch_read_fp (gdbarch, hppa_target_read_fp);
5018 hppa_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
5020 /* Nothing to print for the moment. */
5024 _initialize_hppa_tdep (void)
5026 struct cmd_list_element *c;
5027 void break_at_finish_command (char *arg, int from_tty);
5028 void tbreak_at_finish_command (char *arg, int from_tty);
5029 void break_at_finish_at_depth_command (char *arg, int from_tty);
5031 gdbarch_register (bfd_arch_hppa, hppa_gdbarch_init, hppa_dump_tdep);
5032 tm_print_insn = print_insn_hppa;
5034 add_cmd ("unwind", class_maintenance, unwind_command,
5035 "Print unwind table entry at given address.",
5036 &maintenanceprintlist);
5038 deprecate_cmd (add_com ("xbreak", class_breakpoint,
5039 break_at_finish_command,
5040 concat ("Set breakpoint at procedure exit. \n\
5041 Argument may be function name, or \"*\" and an address.\n\
5042 If function is specified, break at end of code for that function.\n\
5043 If an address is specified, break at the end of the function that contains \n\
5044 that exact address.\n",
5045 "With no arg, uses current execution address of selected stack frame.\n\
5046 This is useful for breaking on return to a stack frame.\n\
5048 Multiple breakpoints at one place are permitted, and useful if conditional.\n\
5050 Do \"help breakpoints\" for info on other commands dealing with breakpoints.", NULL)), NULL);
5051 deprecate_cmd (add_com_alias ("xb", "xbreak", class_breakpoint, 1), NULL);
5052 deprecate_cmd (add_com_alias ("xbr", "xbreak", class_breakpoint, 1), NULL);
5053 deprecate_cmd (add_com_alias ("xbre", "xbreak", class_breakpoint, 1), NULL);
5054 deprecate_cmd (add_com_alias ("xbrea", "xbreak", class_breakpoint, 1), NULL);
5056 deprecate_cmd (c = add_com ("txbreak", class_breakpoint,
5057 tbreak_at_finish_command,
5058 "Set temporary breakpoint at procedure exit. Either there should\n\
5059 be no argument or the argument must be a depth.\n"), NULL);
5060 set_cmd_completer (c, location_completer);
5063 deprecate_cmd (add_com ("bx", class_breakpoint,
5064 break_at_finish_at_depth_command,
5065 "Set breakpoint at procedure exit. Either there should\n\
5066 be no argument or the argument must be a depth.\n"), NULL);