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"
36 /* For argument passing to the inferior */
40 #include <sys/types.h>
44 #include <sys/param.h>
47 #include <sys/ptrace.h>
48 #include <machine/save_state.h>
50 #ifdef COFF_ENCAPSULATE
51 #include "a.out.encap.h"
55 /*#include <sys/user.h> After a.out.h */
66 /* Some local constants. */
67 static const int hppa_num_regs = 128;
69 /* To support detection of the pseudo-initial frame
71 #define THREAD_INITIAL_FRAME_SYMBOL "__pthread_exit"
72 #define THREAD_INITIAL_FRAME_SYM_LEN sizeof(THREAD_INITIAL_FRAME_SYMBOL)
74 static int extract_5_load (unsigned int);
76 static unsigned extract_5R_store (unsigned int);
78 static unsigned extract_5r_store (unsigned int);
80 static void find_dummy_frame_regs (struct frame_info *,
81 struct frame_saved_regs *);
83 static int find_proc_framesize (CORE_ADDR);
85 static int find_return_regnum (CORE_ADDR);
87 struct unwind_table_entry *find_unwind_entry (CORE_ADDR);
89 static int extract_17 (unsigned int);
91 static unsigned deposit_21 (unsigned int, unsigned int);
93 static int extract_21 (unsigned);
95 static unsigned deposit_14 (int, unsigned int);
97 static int extract_14 (unsigned);
99 static void unwind_command (char *, int);
101 static int low_sign_extend (unsigned int, unsigned int);
103 static int sign_extend (unsigned int, unsigned int);
105 static int restore_pc_queue (struct frame_saved_regs *);
107 static int hppa_alignof (struct type *);
109 /* To support multi-threading and stepping. */
110 int hppa_prepare_to_proceed ();
112 static int prologue_inst_adjust_sp (unsigned long);
114 static int is_branch (unsigned long);
116 static int inst_saves_gr (unsigned long);
118 static int inst_saves_fr (unsigned long);
120 static int pc_in_interrupt_handler (CORE_ADDR);
122 static int pc_in_linker_stub (CORE_ADDR);
124 static int compare_unwind_entries (const void *, const void *);
126 static void read_unwind_info (struct objfile *);
128 static void internalize_unwinds (struct objfile *,
129 struct unwind_table_entry *,
130 asection *, unsigned int,
131 unsigned int, CORE_ADDR);
132 static void pa_print_registers (char *, int, int);
133 static void pa_strcat_registers (char *, int, int, struct ui_file *);
134 static void pa_register_look_aside (char *, int, long *);
135 static void pa_print_fp_reg (int);
136 static void pa_strcat_fp_reg (int, struct ui_file *, enum precision_type);
137 static void record_text_segment_lowaddr (bfd *, asection *, void *);
138 /* FIXME: brobecker 2002-11-07: We will likely be able to make the
139 following functions static, once we hppa is partially multiarched. */
140 int hppa_reg_struct_has_addr (int gcc_p, struct type *type);
141 CORE_ADDR hppa_skip_prologue (CORE_ADDR pc);
142 CORE_ADDR hppa_skip_trampoline_code (CORE_ADDR pc);
143 int hppa_in_solib_call_trampoline (CORE_ADDR pc, char *name);
144 int hppa_in_solib_return_trampoline (CORE_ADDR pc, char *name);
145 CORE_ADDR hppa_saved_pc_after_call (struct frame_info *frame);
146 int hppa_inner_than (CORE_ADDR lhs, CORE_ADDR rhs);
147 CORE_ADDR hppa_stack_align (CORE_ADDR sp);
148 int hppa_pc_requires_run_before_use (CORE_ADDR pc);
149 int hppa_instruction_nullified (void);
150 int hppa_register_raw_size (int reg_nr);
151 int hppa_register_byte (int reg_nr);
152 struct type * hppa_register_virtual_type (int reg_nr);
153 void hppa_store_struct_return (CORE_ADDR addr, CORE_ADDR sp);
154 void hppa_extract_return_value (struct type *type, char *regbuf, char *valbuf);
155 int hppa_use_struct_convention (int gcc_p, struct type *type);
156 void hppa_store_return_value (struct type *type, char *valbuf);
157 CORE_ADDR hppa_extract_struct_value_address (char *regbuf);
158 int hppa_cannot_store_register (int regnum);
159 void hppa_init_extra_frame_info (int fromleaf, struct frame_info *frame);
160 CORE_ADDR hppa_frame_chain (struct frame_info *frame);
161 int hppa_frame_chain_valid (CORE_ADDR chain, struct frame_info *thisframe);
162 int hppa_frameless_function_invocation (struct frame_info *frame);
163 CORE_ADDR hppa_frame_saved_pc (struct frame_info *frame);
164 CORE_ADDR hppa_frame_args_address (struct frame_info *fi);
165 CORE_ADDR hppa_frame_locals_address (struct frame_info *fi);
166 int hppa_frame_num_args (struct frame_info *frame);
167 void hppa_push_dummy_frame (struct inferior_status *inf_status);
168 void hppa_pop_frame (void);
169 CORE_ADDR hppa_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun,
170 int nargs, struct value **args,
171 struct type *type, int gcc_p);
172 CORE_ADDR hppa_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
173 int struct_return, CORE_ADDR struct_addr);
174 CORE_ADDR hppa_smash_text_address (CORE_ADDR addr);
175 CORE_ADDR hppa_target_read_pc (ptid_t ptid);
176 void hppa_target_write_pc (CORE_ADDR v, ptid_t ptid);
177 CORE_ADDR hppa_target_read_fp (void);
181 struct minimal_symbol *msym;
182 CORE_ADDR solib_handle;
183 CORE_ADDR return_val;
187 static int cover_find_stub_with_shl_get (PTR);
189 static int is_pa_2 = 0; /* False */
191 /* This is declared in symtab.c; set to 1 in hp-symtab-read.c */
192 extern int hp_som_som_object_present;
194 /* In breakpoint.c */
195 extern int exception_catchpoints_are_fragile;
197 /* Should call_function allocate stack space for a struct return? */
200 hppa_use_struct_convention (int gcc_p, struct type *type)
202 return (TYPE_LENGTH (type) > 2 * REGISTER_SIZE);
206 /* Routines to extract various sized constants out of hppa
209 /* This assumes that no garbage lies outside of the lower bits of
213 sign_extend (unsigned val, unsigned bits)
215 return (int) (val >> (bits - 1) ? (-1 << bits) | val : val);
218 /* For many immediate values the sign bit is the low bit! */
221 low_sign_extend (unsigned val, unsigned bits)
223 return (int) ((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1);
226 /* extract the immediate field from a ld{bhw}s instruction */
229 extract_5_load (unsigned word)
231 return low_sign_extend (word >> 16 & MASK_5, 5);
234 /* extract the immediate field from a break instruction */
237 extract_5r_store (unsigned word)
239 return (word & MASK_5);
242 /* extract the immediate field from a {sr}sm instruction */
245 extract_5R_store (unsigned word)
247 return (word >> 16 & MASK_5);
250 /* extract a 14 bit immediate field */
253 extract_14 (unsigned word)
255 return low_sign_extend (word & MASK_14, 14);
258 /* deposit a 14 bit constant in a word */
261 deposit_14 (int opnd, unsigned word)
263 unsigned sign = (opnd < 0 ? 1 : 0);
265 return word | ((unsigned) opnd << 1 & MASK_14) | sign;
268 /* extract a 21 bit constant */
271 extract_21 (unsigned word)
277 val = GET_FIELD (word, 20, 20);
279 val |= GET_FIELD (word, 9, 19);
281 val |= GET_FIELD (word, 5, 6);
283 val |= GET_FIELD (word, 0, 4);
285 val |= GET_FIELD (word, 7, 8);
286 return sign_extend (val, 21) << 11;
289 /* deposit a 21 bit constant in a word. Although 21 bit constants are
290 usually the top 21 bits of a 32 bit constant, we assume that only
291 the low 21 bits of opnd are relevant */
294 deposit_21 (unsigned opnd, unsigned word)
298 val |= GET_FIELD (opnd, 11 + 14, 11 + 18);
300 val |= GET_FIELD (opnd, 11 + 12, 11 + 13);
302 val |= GET_FIELD (opnd, 11 + 19, 11 + 20);
304 val |= GET_FIELD (opnd, 11 + 1, 11 + 11);
306 val |= GET_FIELD (opnd, 11 + 0, 11 + 0);
310 /* extract a 17 bit constant from branch instructions, returning the
311 19 bit signed value. */
314 extract_17 (unsigned word)
316 return sign_extend (GET_FIELD (word, 19, 28) |
317 GET_FIELD (word, 29, 29) << 10 |
318 GET_FIELD (word, 11, 15) << 11 |
319 (word & 0x1) << 16, 17) << 2;
323 /* Compare the start address for two unwind entries returning 1 if
324 the first address is larger than the second, -1 if the second is
325 larger than the first, and zero if they are equal. */
328 compare_unwind_entries (const void *arg1, const void *arg2)
330 const struct unwind_table_entry *a = arg1;
331 const struct unwind_table_entry *b = arg2;
333 if (a->region_start > b->region_start)
335 else if (a->region_start < b->region_start)
341 static CORE_ADDR low_text_segment_address;
344 record_text_segment_lowaddr (bfd *abfd, asection *section, void *ignored)
346 if (((section->flags & (SEC_ALLOC | SEC_LOAD | SEC_READONLY))
347 == (SEC_ALLOC | SEC_LOAD | SEC_READONLY))
348 && section->vma < low_text_segment_address)
349 low_text_segment_address = section->vma;
353 internalize_unwinds (struct objfile *objfile, struct unwind_table_entry *table,
354 asection *section, unsigned int entries, unsigned int size,
355 CORE_ADDR text_offset)
357 /* We will read the unwind entries into temporary memory, then
358 fill in the actual unwind table. */
363 char *buf = alloca (size);
365 low_text_segment_address = -1;
367 /* If addresses are 64 bits wide, then unwinds are supposed to
368 be segment relative offsets instead of absolute addresses.
370 Note that when loading a shared library (text_offset != 0) the
371 unwinds are already relative to the text_offset that will be
373 if (TARGET_PTR_BIT == 64 && text_offset == 0)
375 bfd_map_over_sections (objfile->obfd,
376 record_text_segment_lowaddr, (PTR) NULL);
378 /* ?!? Mask off some low bits. Should this instead subtract
379 out the lowest section's filepos or something like that?
380 This looks very hokey to me. */
381 low_text_segment_address &= ~0xfff;
382 text_offset += low_text_segment_address;
385 bfd_get_section_contents (objfile->obfd, section, buf, 0, size);
387 /* Now internalize the information being careful to handle host/target
389 for (i = 0; i < entries; i++)
391 table[i].region_start = bfd_get_32 (objfile->obfd,
393 table[i].region_start += text_offset;
395 table[i].region_end = bfd_get_32 (objfile->obfd, (bfd_byte *) buf);
396 table[i].region_end += text_offset;
398 tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf);
400 table[i].Cannot_unwind = (tmp >> 31) & 0x1;
401 table[i].Millicode = (tmp >> 30) & 0x1;
402 table[i].Millicode_save_sr0 = (tmp >> 29) & 0x1;
403 table[i].Region_description = (tmp >> 27) & 0x3;
404 table[i].reserved1 = (tmp >> 26) & 0x1;
405 table[i].Entry_SR = (tmp >> 25) & 0x1;
406 table[i].Entry_FR = (tmp >> 21) & 0xf;
407 table[i].Entry_GR = (tmp >> 16) & 0x1f;
408 table[i].Args_stored = (tmp >> 15) & 0x1;
409 table[i].Variable_Frame = (tmp >> 14) & 0x1;
410 table[i].Separate_Package_Body = (tmp >> 13) & 0x1;
411 table[i].Frame_Extension_Millicode = (tmp >> 12) & 0x1;
412 table[i].Stack_Overflow_Check = (tmp >> 11) & 0x1;
413 table[i].Two_Instruction_SP_Increment = (tmp >> 10) & 0x1;
414 table[i].Ada_Region = (tmp >> 9) & 0x1;
415 table[i].cxx_info = (tmp >> 8) & 0x1;
416 table[i].cxx_try_catch = (tmp >> 7) & 0x1;
417 table[i].sched_entry_seq = (tmp >> 6) & 0x1;
418 table[i].reserved2 = (tmp >> 5) & 0x1;
419 table[i].Save_SP = (tmp >> 4) & 0x1;
420 table[i].Save_RP = (tmp >> 3) & 0x1;
421 table[i].Save_MRP_in_frame = (tmp >> 2) & 0x1;
422 table[i].extn_ptr_defined = (tmp >> 1) & 0x1;
423 table[i].Cleanup_defined = tmp & 0x1;
424 tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf);
426 table[i].MPE_XL_interrupt_marker = (tmp >> 31) & 0x1;
427 table[i].HP_UX_interrupt_marker = (tmp >> 30) & 0x1;
428 table[i].Large_frame = (tmp >> 29) & 0x1;
429 table[i].Pseudo_SP_Set = (tmp >> 28) & 0x1;
430 table[i].reserved4 = (tmp >> 27) & 0x1;
431 table[i].Total_frame_size = tmp & 0x7ffffff;
433 /* Stub unwinds are handled elsewhere. */
434 table[i].stub_unwind.stub_type = 0;
435 table[i].stub_unwind.padding = 0;
440 /* Read in the backtrace information stored in the `$UNWIND_START$' section of
441 the object file. This info is used mainly by find_unwind_entry() to find
442 out the stack frame size and frame pointer used by procedures. We put
443 everything on the psymbol obstack in the objfile so that it automatically
444 gets freed when the objfile is destroyed. */
447 read_unwind_info (struct objfile *objfile)
449 asection *unwind_sec, *stub_unwind_sec;
450 unsigned unwind_size, stub_unwind_size, total_size;
451 unsigned index, unwind_entries;
452 unsigned stub_entries, total_entries;
453 CORE_ADDR text_offset;
454 struct obj_unwind_info *ui;
455 obj_private_data_t *obj_private;
457 text_offset = ANOFFSET (objfile->section_offsets, 0);
458 ui = (struct obj_unwind_info *) obstack_alloc (&objfile->psymbol_obstack,
459 sizeof (struct obj_unwind_info));
465 /* For reasons unknown the HP PA64 tools generate multiple unwinder
466 sections in a single executable. So we just iterate over every
467 section in the BFD looking for unwinder sections intead of trying
468 to do a lookup with bfd_get_section_by_name.
470 First determine the total size of the unwind tables so that we
471 can allocate memory in a nice big hunk. */
473 for (unwind_sec = objfile->obfd->sections;
475 unwind_sec = unwind_sec->next)
477 if (strcmp (unwind_sec->name, "$UNWIND_START$") == 0
478 || strcmp (unwind_sec->name, ".PARISC.unwind") == 0)
480 unwind_size = bfd_section_size (objfile->obfd, unwind_sec);
481 unwind_entries = unwind_size / UNWIND_ENTRY_SIZE;
483 total_entries += unwind_entries;
487 /* Now compute the size of the stub unwinds. Note the ELF tools do not
488 use stub unwinds at the curren time. */
489 stub_unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_END$");
493 stub_unwind_size = bfd_section_size (objfile->obfd, stub_unwind_sec);
494 stub_entries = stub_unwind_size / STUB_UNWIND_ENTRY_SIZE;
498 stub_unwind_size = 0;
502 /* Compute total number of unwind entries and their total size. */
503 total_entries += stub_entries;
504 total_size = total_entries * sizeof (struct unwind_table_entry);
506 /* Allocate memory for the unwind table. */
507 ui->table = (struct unwind_table_entry *)
508 obstack_alloc (&objfile->psymbol_obstack, total_size);
509 ui->last = total_entries - 1;
511 /* Now read in each unwind section and internalize the standard unwind
514 for (unwind_sec = objfile->obfd->sections;
516 unwind_sec = unwind_sec->next)
518 if (strcmp (unwind_sec->name, "$UNWIND_START$") == 0
519 || strcmp (unwind_sec->name, ".PARISC.unwind") == 0)
521 unwind_size = bfd_section_size (objfile->obfd, unwind_sec);
522 unwind_entries = unwind_size / UNWIND_ENTRY_SIZE;
524 internalize_unwinds (objfile, &ui->table[index], unwind_sec,
525 unwind_entries, unwind_size, text_offset);
526 index += unwind_entries;
530 /* Now read in and internalize the stub unwind entries. */
531 if (stub_unwind_size > 0)
534 char *buf = alloca (stub_unwind_size);
536 /* Read in the stub unwind entries. */
537 bfd_get_section_contents (objfile->obfd, stub_unwind_sec, buf,
538 0, stub_unwind_size);
540 /* Now convert them into regular unwind entries. */
541 for (i = 0; i < stub_entries; i++, index++)
543 /* Clear out the next unwind entry. */
544 memset (&ui->table[index], 0, sizeof (struct unwind_table_entry));
546 /* Convert offset & size into region_start and region_end.
547 Stuff away the stub type into "reserved" fields. */
548 ui->table[index].region_start = bfd_get_32 (objfile->obfd,
550 ui->table[index].region_start += text_offset;
552 ui->table[index].stub_unwind.stub_type = bfd_get_8 (objfile->obfd,
555 ui->table[index].region_end
556 = ui->table[index].region_start + 4 *
557 (bfd_get_16 (objfile->obfd, (bfd_byte *) buf) - 1);
563 /* Unwind table needs to be kept sorted. */
564 qsort (ui->table, total_entries, sizeof (struct unwind_table_entry),
565 compare_unwind_entries);
567 /* Keep a pointer to the unwind information. */
568 if (objfile->obj_private == NULL)
570 obj_private = (obj_private_data_t *)
571 obstack_alloc (&objfile->psymbol_obstack,
572 sizeof (obj_private_data_t));
573 obj_private->unwind_info = NULL;
574 obj_private->so_info = NULL;
577 objfile->obj_private = (PTR) obj_private;
579 obj_private = (obj_private_data_t *) objfile->obj_private;
580 obj_private->unwind_info = ui;
583 /* Lookup the unwind (stack backtrace) info for the given PC. We search all
584 of the objfiles seeking the unwind table entry for this PC. Each objfile
585 contains a sorted list of struct unwind_table_entry. Since we do a binary
586 search of the unwind tables, we depend upon them to be sorted. */
588 struct unwind_table_entry *
589 find_unwind_entry (CORE_ADDR pc)
591 int first, middle, last;
592 struct objfile *objfile;
594 /* A function at address 0? Not in HP-UX! */
595 if (pc == (CORE_ADDR) 0)
598 ALL_OBJFILES (objfile)
600 struct obj_unwind_info *ui;
602 if (objfile->obj_private)
603 ui = ((obj_private_data_t *) (objfile->obj_private))->unwind_info;
607 read_unwind_info (objfile);
608 if (objfile->obj_private == NULL)
609 error ("Internal error reading unwind information.");
610 ui = ((obj_private_data_t *) (objfile->obj_private))->unwind_info;
613 /* First, check the cache */
616 && pc >= ui->cache->region_start
617 && pc <= ui->cache->region_end)
620 /* Not in the cache, do a binary search */
625 while (first <= last)
627 middle = (first + last) / 2;
628 if (pc >= ui->table[middle].region_start
629 && pc <= ui->table[middle].region_end)
631 ui->cache = &ui->table[middle];
632 return &ui->table[middle];
635 if (pc < ui->table[middle].region_start)
640 } /* ALL_OBJFILES() */
644 /* Return the adjustment necessary to make for addresses on the stack
645 as presented by hpread.c.
647 This is necessary because of the stack direction on the PA and the
648 bizarre way in which someone (?) decided they wanted to handle
649 frame pointerless code in GDB. */
651 hpread_adjust_stack_address (CORE_ADDR func_addr)
653 struct unwind_table_entry *u;
655 u = find_unwind_entry (func_addr);
659 return u->Total_frame_size << 3;
662 /* Called to determine if PC is in an interrupt handler of some
666 pc_in_interrupt_handler (CORE_ADDR pc)
668 struct unwind_table_entry *u;
669 struct minimal_symbol *msym_us;
671 u = find_unwind_entry (pc);
675 /* Oh joys. HPUX sets the interrupt bit for _sigreturn even though
676 its frame isn't a pure interrupt frame. Deal with this. */
677 msym_us = lookup_minimal_symbol_by_pc (pc);
679 return (u->HP_UX_interrupt_marker
680 && !PC_IN_SIGTRAMP (pc, SYMBOL_NAME (msym_us)));
683 /* Called when no unwind descriptor was found for PC. Returns 1 if it
684 appears that PC is in a linker stub.
686 ?!? Need to handle stubs which appear in PA64 code. */
689 pc_in_linker_stub (CORE_ADDR pc)
691 int found_magic_instruction = 0;
695 /* If unable to read memory, assume pc is not in a linker stub. */
696 if (target_read_memory (pc, buf, 4) != 0)
699 /* We are looking for something like
701 ; $$dyncall jams RP into this special spot in the frame (RP')
702 ; before calling the "call stub"
705 ldsid (rp),r1 ; Get space associated with RP into r1
706 mtsp r1,sp ; Move it into space register 0
707 be,n 0(sr0),rp) ; back to your regularly scheduled program */
709 /* Maximum known linker stub size is 4 instructions. Search forward
710 from the given PC, then backward. */
711 for (i = 0; i < 4; i++)
713 /* If we hit something with an unwind, stop searching this direction. */
715 if (find_unwind_entry (pc + i * 4) != 0)
718 /* Check for ldsid (rp),r1 which is the magic instruction for a
719 return from a cross-space function call. */
720 if (read_memory_integer (pc + i * 4, 4) == 0x004010a1)
722 found_magic_instruction = 1;
725 /* Add code to handle long call/branch and argument relocation stubs
729 if (found_magic_instruction != 0)
732 /* Now look backward. */
733 for (i = 0; i < 4; i++)
735 /* If we hit something with an unwind, stop searching this direction. */
737 if (find_unwind_entry (pc - i * 4) != 0)
740 /* Check for ldsid (rp),r1 which is the magic instruction for a
741 return from a cross-space function call. */
742 if (read_memory_integer (pc - i * 4, 4) == 0x004010a1)
744 found_magic_instruction = 1;
747 /* Add code to handle long call/branch and argument relocation stubs
750 return found_magic_instruction;
754 find_return_regnum (CORE_ADDR pc)
756 struct unwind_table_entry *u;
758 u = find_unwind_entry (pc);
769 /* Return size of frame, or -1 if we should use a frame pointer. */
771 find_proc_framesize (CORE_ADDR pc)
773 struct unwind_table_entry *u;
774 struct minimal_symbol *msym_us;
776 /* This may indicate a bug in our callers... */
777 if (pc == (CORE_ADDR) 0)
780 u = find_unwind_entry (pc);
784 if (pc_in_linker_stub (pc))
785 /* Linker stubs have a zero size frame. */
791 msym_us = lookup_minimal_symbol_by_pc (pc);
793 /* If Save_SP is set, and we're not in an interrupt or signal caller,
794 then we have a frame pointer. Use it. */
796 && !pc_in_interrupt_handler (pc)
798 && !PC_IN_SIGTRAMP (pc, SYMBOL_NAME (msym_us)))
801 return u->Total_frame_size << 3;
804 /* Return offset from sp at which rp is saved, or 0 if not saved. */
805 static int rp_saved (CORE_ADDR);
808 rp_saved (CORE_ADDR pc)
810 struct unwind_table_entry *u;
812 /* A function at, and thus a return PC from, address 0? Not in HP-UX! */
813 if (pc == (CORE_ADDR) 0)
816 u = find_unwind_entry (pc);
820 if (pc_in_linker_stub (pc))
821 /* This is the so-called RP'. */
828 return (TARGET_PTR_BIT == 64 ? -16 : -20);
829 else if (u->stub_unwind.stub_type != 0)
831 switch (u->stub_unwind.stub_type)
836 case PARAMETER_RELOCATION:
847 hppa_frameless_function_invocation (struct frame_info *frame)
849 struct unwind_table_entry *u;
851 u = find_unwind_entry (frame->pc);
856 return (u->Total_frame_size == 0 && u->stub_unwind.stub_type == 0);
859 /* Immediately after a function call, return the saved pc.
860 Can't go through the frames for this because on some machines
861 the new frame is not set up until the new function executes
862 some instructions. */
865 hppa_saved_pc_after_call (struct frame_info *frame)
869 struct unwind_table_entry *u;
871 ret_regnum = find_return_regnum (get_frame_pc (frame));
872 pc = read_register (ret_regnum) & ~0x3;
874 /* If PC is in a linker stub, then we need to dig the address
875 the stub will return to out of the stack. */
876 u = find_unwind_entry (pc);
877 if (u && u->stub_unwind.stub_type != 0)
878 return FRAME_SAVED_PC (frame);
884 hppa_frame_saved_pc (struct frame_info *frame)
886 CORE_ADDR pc = get_frame_pc (frame);
887 struct unwind_table_entry *u;
889 int spun_around_loop = 0;
892 /* BSD, HPUX & OSF1 all lay out the hardware state in the same manner
893 at the base of the frame in an interrupt handler. Registers within
894 are saved in the exact same order as GDB numbers registers. How
896 if (pc_in_interrupt_handler (pc))
897 return read_memory_integer (frame->frame + PC_REGNUM * 4,
898 TARGET_PTR_BIT / 8) & ~0x3;
900 if ((frame->pc >= frame->frame
901 && frame->pc <= (frame->frame
902 /* A call dummy is sized in words, but it is
903 actually a series of instructions. Account
904 for that scaling factor. */
905 + ((REGISTER_SIZE / INSTRUCTION_SIZE)
907 /* Similarly we have to account for 64bit
908 wide register saves. */
909 + (32 * REGISTER_SIZE)
910 /* We always consider FP regs 8 bytes long. */
911 + (NUM_REGS - FP0_REGNUM) * 8
912 /* Similarly we have to account for 64bit
913 wide register saves. */
914 + (6 * REGISTER_SIZE))))
916 return read_memory_integer ((frame->frame
917 + (TARGET_PTR_BIT == 64 ? -16 : -20)),
918 TARGET_PTR_BIT / 8) & ~0x3;
921 #ifdef FRAME_SAVED_PC_IN_SIGTRAMP
922 /* Deal with signal handler caller frames too. */
923 if ((get_frame_type (frame) == SIGTRAMP_FRAME))
926 FRAME_SAVED_PC_IN_SIGTRAMP (frame, &rp);
931 if (hppa_frameless_function_invocation (frame))
935 ret_regnum = find_return_regnum (pc);
937 /* If the next frame is an interrupt frame or a signal
938 handler caller, then we need to look in the saved
939 register area to get the return pointer (the values
940 in the registers may not correspond to anything useful). */
942 && ((get_frame_type (frame->next) == SIGTRAMP_FRAME)
943 || pc_in_interrupt_handler (frame->next->pc)))
945 struct frame_saved_regs saved_regs;
947 deprecated_get_frame_saved_regs (frame->next, &saved_regs);
948 if (read_memory_integer (saved_regs.regs[FLAGS_REGNUM],
949 TARGET_PTR_BIT / 8) & 0x2)
951 pc = read_memory_integer (saved_regs.regs[31],
952 TARGET_PTR_BIT / 8) & ~0x3;
954 /* Syscalls are really two frames. The syscall stub itself
955 with a return pointer in %rp and the kernel call with
956 a return pointer in %r31. We return the %rp variant
957 if %r31 is the same as frame->pc. */
959 pc = read_memory_integer (saved_regs.regs[RP_REGNUM],
960 TARGET_PTR_BIT / 8) & ~0x3;
963 pc = read_memory_integer (saved_regs.regs[RP_REGNUM],
964 TARGET_PTR_BIT / 8) & ~0x3;
967 pc = read_register (ret_regnum) & ~0x3;
971 spun_around_loop = 0;
975 rp_offset = rp_saved (pc);
977 /* Similar to code in frameless function case. If the next
978 frame is a signal or interrupt handler, then dig the right
979 information out of the saved register info. */
982 && ((get_frame_type (frame->next) == SIGTRAMP_FRAME)
983 || pc_in_interrupt_handler (frame->next->pc)))
985 struct frame_saved_regs saved_regs;
987 deprecated_get_frame_saved_regs (frame->next, &saved_regs);
988 if (read_memory_integer (saved_regs.regs[FLAGS_REGNUM],
989 TARGET_PTR_BIT / 8) & 0x2)
991 pc = read_memory_integer (saved_regs.regs[31],
992 TARGET_PTR_BIT / 8) & ~0x3;
994 /* Syscalls are really two frames. The syscall stub itself
995 with a return pointer in %rp and the kernel call with
996 a return pointer in %r31. We return the %rp variant
997 if %r31 is the same as frame->pc. */
999 pc = read_memory_integer (saved_regs.regs[RP_REGNUM],
1000 TARGET_PTR_BIT / 8) & ~0x3;
1003 pc = read_memory_integer (saved_regs.regs[RP_REGNUM],
1004 TARGET_PTR_BIT / 8) & ~0x3;
1006 else if (rp_offset == 0)
1009 pc = read_register (RP_REGNUM) & ~0x3;
1014 pc = read_memory_integer (frame->frame + rp_offset,
1015 TARGET_PTR_BIT / 8) & ~0x3;
1019 /* If PC is inside a linker stub, then dig out the address the stub
1022 Don't do this for long branch stubs. Why? For some unknown reason
1023 _start is marked as a long branch stub in hpux10. */
1024 u = find_unwind_entry (pc);
1025 if (u && u->stub_unwind.stub_type != 0
1026 && u->stub_unwind.stub_type != LONG_BRANCH)
1030 /* If this is a dynamic executable, and we're in a signal handler,
1031 then the call chain will eventually point us into the stub for
1032 _sigreturn. Unlike most cases, we'll be pointed to the branch
1033 to the real sigreturn rather than the code after the real branch!.
1035 Else, try to dig the address the stub will return to in the normal
1037 insn = read_memory_integer (pc, 4);
1038 if ((insn & 0xfc00e000) == 0xe8000000)
1039 return (pc + extract_17 (insn) + 8) & ~0x3;
1045 if (spun_around_loop > 1)
1047 /* We're just about to go around the loop again with
1048 no more hope of success. Die. */
1049 error ("Unable to find return pc for this frame");
1059 /* We need to correct the PC and the FP for the outermost frame when we are
1060 in a system call. */
1063 hppa_init_extra_frame_info (int fromleaf, struct frame_info *frame)
1068 if (frame->next && !fromleaf)
1071 /* If the next frame represents a frameless function invocation
1072 then we have to do some adjustments that are normally done by
1073 FRAME_CHAIN. (FRAME_CHAIN is not called in this case.) */
1076 /* Find the framesize of *this* frame without peeking at the PC
1077 in the current frame structure (it isn't set yet). */
1078 framesize = find_proc_framesize (FRAME_SAVED_PC (get_next_frame (frame)));
1080 /* Now adjust our base frame accordingly. If we have a frame pointer
1081 use it, else subtract the size of this frame from the current
1082 frame. (we always want frame->frame to point at the lowest address
1084 if (framesize == -1)
1085 frame->frame = TARGET_READ_FP ();
1087 frame->frame -= framesize;
1091 flags = read_register (FLAGS_REGNUM);
1092 if (flags & 2) /* In system call? */
1093 frame->pc = read_register (31) & ~0x3;
1095 /* The outermost frame is always derived from PC-framesize
1097 One might think frameless innermost frames should have
1098 a frame->frame that is the same as the parent's frame->frame.
1099 That is wrong; frame->frame in that case should be the *high*
1100 address of the parent's frame. It's complicated as hell to
1101 explain, but the parent *always* creates some stack space for
1102 the child. So the child actually does have a frame of some
1103 sorts, and its base is the high address in its parent's frame. */
1104 framesize = find_proc_framesize (frame->pc);
1105 if (framesize == -1)
1106 frame->frame = TARGET_READ_FP ();
1108 frame->frame = read_register (SP_REGNUM) - framesize;
1111 /* Given a GDB frame, determine the address of the calling function's
1112 frame. This will be used to create a new GDB frame struct, and
1113 then INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC will be
1114 called for the new frame.
1116 This may involve searching through prologues for several functions
1117 at boundaries where GCC calls HP C code, or where code which has
1118 a frame pointer calls code without a frame pointer. */
1121 hppa_frame_chain (struct frame_info *frame)
1123 int my_framesize, caller_framesize;
1124 struct unwind_table_entry *u;
1125 CORE_ADDR frame_base;
1126 struct frame_info *tmp_frame;
1128 /* A frame in the current frame list, or zero. */
1129 struct frame_info *saved_regs_frame = 0;
1130 /* Where the registers were saved in saved_regs_frame.
1131 If saved_regs_frame is zero, this is garbage. */
1132 struct frame_saved_regs saved_regs;
1134 CORE_ADDR caller_pc;
1136 struct minimal_symbol *min_frame_symbol;
1137 struct symbol *frame_symbol;
1138 char *frame_symbol_name;
1140 /* If this is a threaded application, and we see the
1141 routine "__pthread_exit", treat it as the stack root
1143 min_frame_symbol = lookup_minimal_symbol_by_pc (frame->pc);
1144 frame_symbol = find_pc_function (frame->pc);
1146 if ((min_frame_symbol != 0) /* && (frame_symbol == 0) */ )
1148 /* The test above for "no user function name" would defend
1149 against the slim likelihood that a user might define a
1150 routine named "__pthread_exit" and then try to debug it.
1152 If it weren't commented out, and you tried to debug the
1153 pthread library itself, you'd get errors.
1155 So for today, we don't make that check. */
1156 frame_symbol_name = SYMBOL_NAME (min_frame_symbol);
1157 if (frame_symbol_name != 0)
1159 if (0 == strncmp (frame_symbol_name,
1160 THREAD_INITIAL_FRAME_SYMBOL,
1161 THREAD_INITIAL_FRAME_SYM_LEN))
1163 /* Pretend we've reached the bottom of the stack. */
1164 return (CORE_ADDR) 0;
1167 } /* End of hacky code for threads. */
1169 /* Handle HPUX, BSD, and OSF1 style interrupt frames first. These
1170 are easy; at *sp we have a full save state strucutre which we can
1171 pull the old stack pointer from. Also see frame_saved_pc for
1172 code to dig a saved PC out of the save state structure. */
1173 if (pc_in_interrupt_handler (frame->pc))
1174 frame_base = read_memory_integer (frame->frame + SP_REGNUM * 4,
1175 TARGET_PTR_BIT / 8);
1176 #ifdef FRAME_BASE_BEFORE_SIGTRAMP
1177 else if ((get_frame_type (frame) == SIGTRAMP_FRAME))
1179 FRAME_BASE_BEFORE_SIGTRAMP (frame, &frame_base);
1183 frame_base = frame->frame;
1185 /* Get frame sizes for the current frame and the frame of the
1187 my_framesize = find_proc_framesize (frame->pc);
1188 caller_pc = FRAME_SAVED_PC (frame);
1190 /* If we can't determine the caller's PC, then it's not likely we can
1191 really determine anything meaningful about its frame. We'll consider
1192 this to be stack bottom. */
1193 if (caller_pc == (CORE_ADDR) 0)
1194 return (CORE_ADDR) 0;
1196 caller_framesize = find_proc_framesize (FRAME_SAVED_PC (frame));
1198 /* If caller does not have a frame pointer, then its frame
1199 can be found at current_frame - caller_framesize. */
1200 if (caller_framesize != -1)
1202 return frame_base - caller_framesize;
1204 /* Both caller and callee have frame pointers and are GCC compiled
1205 (SAVE_SP bit in unwind descriptor is on for both functions.
1206 The previous frame pointer is found at the top of the current frame. */
1207 if (caller_framesize == -1 && my_framesize == -1)
1209 return read_memory_integer (frame_base, TARGET_PTR_BIT / 8);
1211 /* Caller has a frame pointer, but callee does not. This is a little
1212 more difficult as GCC and HP C lay out locals and callee register save
1213 areas very differently.
1215 The previous frame pointer could be in a register, or in one of
1216 several areas on the stack.
1218 Walk from the current frame to the innermost frame examining
1219 unwind descriptors to determine if %r3 ever gets saved into the
1220 stack. If so return whatever value got saved into the stack.
1221 If it was never saved in the stack, then the value in %r3 is still
1224 We use information from unwind descriptors to determine if %r3
1225 is saved into the stack (Entry_GR field has this information). */
1227 for (tmp_frame = frame; tmp_frame; tmp_frame = tmp_frame->next)
1229 u = find_unwind_entry (tmp_frame->pc);
1233 /* We could find this information by examining prologues. I don't
1234 think anyone has actually written any tools (not even "strip")
1235 which leave them out of an executable, so maybe this is a moot
1237 /* ??rehrauer: Actually, it's quite possible to stepi your way into
1238 code that doesn't have unwind entries. For example, stepping into
1239 the dynamic linker will give you a PC that has none. Thus, I've
1240 disabled this warning. */
1242 warning ("Unable to find unwind for PC 0x%x -- Help!", tmp_frame->pc);
1244 return (CORE_ADDR) 0;
1248 || (get_frame_type (tmp_frame) == SIGTRAMP_FRAME)
1249 || pc_in_interrupt_handler (tmp_frame->pc))
1252 /* Entry_GR specifies the number of callee-saved general registers
1253 saved in the stack. It starts at %r3, so %r3 would be 1. */
1254 if (u->Entry_GR >= 1)
1256 /* The unwind entry claims that r3 is saved here. However,
1257 in optimized code, GCC often doesn't actually save r3.
1258 We'll discover this if we look at the prologue. */
1259 deprecated_get_frame_saved_regs (tmp_frame, &saved_regs);
1260 saved_regs_frame = tmp_frame;
1262 /* If we have an address for r3, that's good. */
1263 if (saved_regs.regs[FP_REGNUM])
1270 /* We may have walked down the chain into a function with a frame
1273 && !(get_frame_type (tmp_frame) == SIGTRAMP_FRAME)
1274 && !pc_in_interrupt_handler (tmp_frame->pc))
1276 return read_memory_integer (tmp_frame->frame, TARGET_PTR_BIT / 8);
1278 /* %r3 was saved somewhere in the stack. Dig it out. */
1283 For optimization purposes many kernels don't have the
1284 callee saved registers into the save_state structure upon
1285 entry into the kernel for a syscall; the optimization
1286 is usually turned off if the process is being traced so
1287 that the debugger can get full register state for the
1290 This scheme works well except for two cases:
1292 * Attaching to a process when the process is in the
1293 kernel performing a system call (debugger can't get
1294 full register state for the inferior process since
1295 the process wasn't being traced when it entered the
1298 * Register state is not complete if the system call
1299 causes the process to core dump.
1302 The following heinous code is an attempt to deal with
1303 the lack of register state in a core dump. It will
1304 fail miserably if the function which performs the
1305 system call has a variable sized stack frame. */
1307 if (tmp_frame != saved_regs_frame)
1308 deprecated_get_frame_saved_regs (tmp_frame, &saved_regs);
1310 /* Abominable hack. */
1311 if (current_target.to_has_execution == 0
1312 && ((saved_regs.regs[FLAGS_REGNUM]
1313 && (read_memory_integer (saved_regs.regs[FLAGS_REGNUM],
1316 || (saved_regs.regs[FLAGS_REGNUM] == 0
1317 && read_register (FLAGS_REGNUM) & 0x2)))
1319 u = find_unwind_entry (FRAME_SAVED_PC (frame));
1322 return read_memory_integer (saved_regs.regs[FP_REGNUM],
1323 TARGET_PTR_BIT / 8);
1327 return frame_base - (u->Total_frame_size << 3);
1331 return read_memory_integer (saved_regs.regs[FP_REGNUM],
1332 TARGET_PTR_BIT / 8);
1337 /* Get the innermost frame. */
1339 while (tmp_frame->next != NULL)
1340 tmp_frame = tmp_frame->next;
1342 if (tmp_frame != saved_regs_frame)
1343 deprecated_get_frame_saved_regs (tmp_frame, &saved_regs);
1345 /* Abominable hack. See above. */
1346 if (current_target.to_has_execution == 0
1347 && ((saved_regs.regs[FLAGS_REGNUM]
1348 && (read_memory_integer (saved_regs.regs[FLAGS_REGNUM],
1351 || (saved_regs.regs[FLAGS_REGNUM] == 0
1352 && read_register (FLAGS_REGNUM) & 0x2)))
1354 u = find_unwind_entry (FRAME_SAVED_PC (frame));
1357 return read_memory_integer (saved_regs.regs[FP_REGNUM],
1358 TARGET_PTR_BIT / 8);
1362 return frame_base - (u->Total_frame_size << 3);
1366 /* The value in %r3 was never saved into the stack (thus %r3 still
1367 holds the value of the previous frame pointer). */
1368 return TARGET_READ_FP ();
1373 /* To see if a frame chain is valid, see if the caller looks like it
1374 was compiled with gcc. */
1377 hppa_frame_chain_valid (CORE_ADDR chain, struct frame_info *thisframe)
1379 struct minimal_symbol *msym_us;
1380 struct minimal_symbol *msym_start;
1381 struct unwind_table_entry *u, *next_u = NULL;
1382 struct frame_info *next;
1387 u = find_unwind_entry (thisframe->pc);
1392 /* We can't just check that the same of msym_us is "_start", because
1393 someone idiotically decided that they were going to make a Ltext_end
1394 symbol with the same address. This Ltext_end symbol is totally
1395 indistinguishable (as nearly as I can tell) from the symbol for a function
1396 which is (legitimately, since it is in the user's namespace)
1397 named Ltext_end, so we can't just ignore it. */
1398 msym_us = lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe));
1399 msym_start = lookup_minimal_symbol ("_start", NULL, NULL);
1402 && SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start))
1405 /* Grrrr. Some new idiot decided that they don't want _start for the
1406 PRO configurations; $START$ calls main directly.... Deal with it. */
1407 msym_start = lookup_minimal_symbol ("$START$", NULL, NULL);
1410 && SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start))
1413 next = get_next_frame (thisframe);
1415 next_u = find_unwind_entry (next->pc);
1417 /* If this frame does not save SP, has no stack, isn't a stub,
1418 and doesn't "call" an interrupt routine or signal handler caller,
1419 then its not valid. */
1420 if (u->Save_SP || u->Total_frame_size || u->stub_unwind.stub_type != 0
1421 || (thisframe->next && (get_frame_type (thisframe->next) == SIGTRAMP_FRAME))
1422 || (next_u && next_u->HP_UX_interrupt_marker))
1425 if (pc_in_linker_stub (thisframe->pc))
1432 These functions deal with saving and restoring register state
1433 around a function call in the inferior. They keep the stack
1434 double-word aligned; eventually, on an hp700, the stack will have
1435 to be aligned to a 64-byte boundary. */
1438 hppa_push_dummy_frame (struct inferior_status *inf_status)
1440 CORE_ADDR sp, pc, pcspace;
1441 register int regnum;
1442 CORE_ADDR int_buffer;
1445 /* Oh, what a hack. If we're trying to perform an inferior call
1446 while the inferior is asleep, we have to make sure to clear
1447 the "in system call" bit in the flag register (the call will
1448 start after the syscall returns, so we're no longer in the system
1449 call!) This state is kept in "inf_status", change it there.
1451 We also need a number of horrid hacks to deal with lossage in the
1452 PC queue registers (apparently they're not valid when the in syscall
1454 pc = hppa_target_read_pc (inferior_ptid);
1455 int_buffer = read_register (FLAGS_REGNUM);
1456 if (int_buffer & 0x2)
1460 write_inferior_status_register (inf_status, 0, int_buffer);
1461 write_inferior_status_register (inf_status, PCOQ_HEAD_REGNUM, pc + 0);
1462 write_inferior_status_register (inf_status, PCOQ_TAIL_REGNUM, pc + 4);
1463 sid = (pc >> 30) & 0x3;
1465 pcspace = read_register (SR4_REGNUM);
1467 pcspace = read_register (SR4_REGNUM + 4 + sid);
1468 write_inferior_status_register (inf_status, PCSQ_HEAD_REGNUM, pcspace);
1469 write_inferior_status_register (inf_status, PCSQ_TAIL_REGNUM, pcspace);
1472 pcspace = read_register (PCSQ_HEAD_REGNUM);
1474 /* Space for "arguments"; the RP goes in here. */
1475 sp = read_register (SP_REGNUM) + 48;
1476 int_buffer = read_register (RP_REGNUM) | 0x3;
1478 /* The 32bit and 64bit ABIs save the return pointer into different
1480 if (REGISTER_SIZE == 8)
1481 write_memory (sp - 16, (char *) &int_buffer, REGISTER_SIZE);
1483 write_memory (sp - 20, (char *) &int_buffer, REGISTER_SIZE);
1485 int_buffer = TARGET_READ_FP ();
1486 write_memory (sp, (char *) &int_buffer, REGISTER_SIZE);
1488 write_register (FP_REGNUM, sp);
1490 sp += 2 * REGISTER_SIZE;
1492 for (regnum = 1; regnum < 32; regnum++)
1493 if (regnum != RP_REGNUM && regnum != FP_REGNUM)
1494 sp = push_word (sp, read_register (regnum));
1496 /* This is not necessary for the 64bit ABI. In fact it is dangerous. */
1497 if (REGISTER_SIZE != 8)
1500 for (regnum = FP0_REGNUM; regnum < NUM_REGS; regnum++)
1502 deprecated_read_register_bytes (REGISTER_BYTE (regnum),
1503 (char *) &freg_buffer, 8);
1504 sp = push_bytes (sp, (char *) &freg_buffer, 8);
1506 sp = push_word (sp, read_register (IPSW_REGNUM));
1507 sp = push_word (sp, read_register (SAR_REGNUM));
1508 sp = push_word (sp, pc);
1509 sp = push_word (sp, pcspace);
1510 sp = push_word (sp, pc + 4);
1511 sp = push_word (sp, pcspace);
1512 write_register (SP_REGNUM, sp);
1516 find_dummy_frame_regs (struct frame_info *frame,
1517 struct frame_saved_regs *frame_saved_regs)
1519 CORE_ADDR fp = frame->frame;
1522 /* The 32bit and 64bit ABIs save RP into different locations. */
1523 if (REGISTER_SIZE == 8)
1524 frame_saved_regs->regs[RP_REGNUM] = (fp - 16) & ~0x3;
1526 frame_saved_regs->regs[RP_REGNUM] = (fp - 20) & ~0x3;
1528 frame_saved_regs->regs[FP_REGNUM] = fp;
1530 frame_saved_regs->regs[1] = fp + (2 * REGISTER_SIZE);
1532 for (fp += 3 * REGISTER_SIZE, i = 3; i < 32; i++)
1536 frame_saved_regs->regs[i] = fp;
1537 fp += REGISTER_SIZE;
1541 /* This is not necessary or desirable for the 64bit ABI. */
1542 if (REGISTER_SIZE != 8)
1545 for (i = FP0_REGNUM; i < NUM_REGS; i++, fp += 8)
1546 frame_saved_regs->regs[i] = fp;
1548 frame_saved_regs->regs[IPSW_REGNUM] = fp;
1549 frame_saved_regs->regs[SAR_REGNUM] = fp + REGISTER_SIZE;
1550 frame_saved_regs->regs[PCOQ_HEAD_REGNUM] = fp + 2 * REGISTER_SIZE;
1551 frame_saved_regs->regs[PCSQ_HEAD_REGNUM] = fp + 3 * REGISTER_SIZE;
1552 frame_saved_regs->regs[PCOQ_TAIL_REGNUM] = fp + 4 * REGISTER_SIZE;
1553 frame_saved_regs->regs[PCSQ_TAIL_REGNUM] = fp + 5 * REGISTER_SIZE;
1557 hppa_pop_frame (void)
1559 register struct frame_info *frame = get_current_frame ();
1560 register CORE_ADDR fp, npc, target_pc;
1561 register int regnum;
1562 struct frame_saved_regs fsr;
1565 fp = get_frame_base (frame);
1566 deprecated_get_frame_saved_regs (frame, &fsr);
1568 #ifndef NO_PC_SPACE_QUEUE_RESTORE
1569 if (fsr.regs[IPSW_REGNUM]) /* Restoring a call dummy frame */
1570 restore_pc_queue (&fsr);
1573 for (regnum = 31; regnum > 0; regnum--)
1574 if (fsr.regs[regnum])
1575 write_register (regnum, read_memory_integer (fsr.regs[regnum],
1578 for (regnum = NUM_REGS - 1; regnum >= FP0_REGNUM; regnum--)
1579 if (fsr.regs[regnum])
1581 read_memory (fsr.regs[regnum], (char *) &freg_buffer, 8);
1582 deprecated_write_register_bytes (REGISTER_BYTE (regnum),
1583 (char *) &freg_buffer, 8);
1586 if (fsr.regs[IPSW_REGNUM])
1587 write_register (IPSW_REGNUM,
1588 read_memory_integer (fsr.regs[IPSW_REGNUM],
1591 if (fsr.regs[SAR_REGNUM])
1592 write_register (SAR_REGNUM,
1593 read_memory_integer (fsr.regs[SAR_REGNUM],
1596 /* If the PC was explicitly saved, then just restore it. */
1597 if (fsr.regs[PCOQ_TAIL_REGNUM])
1599 npc = read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM],
1601 write_register (PCOQ_TAIL_REGNUM, npc);
1603 /* Else use the value in %rp to set the new PC. */
1606 npc = read_register (RP_REGNUM);
1610 write_register (FP_REGNUM, read_memory_integer (fp, REGISTER_SIZE));
1612 if (fsr.regs[IPSW_REGNUM]) /* call dummy */
1613 write_register (SP_REGNUM, fp - 48);
1615 write_register (SP_REGNUM, fp);
1617 /* The PC we just restored may be inside a return trampoline. If so
1618 we want to restart the inferior and run it through the trampoline.
1620 Do this by setting a momentary breakpoint at the location the
1621 trampoline returns to.
1623 Don't skip through the trampoline if we're popping a dummy frame. */
1624 target_pc = SKIP_TRAMPOLINE_CODE (npc & ~0x3) & ~0x3;
1625 if (target_pc && !fsr.regs[IPSW_REGNUM])
1627 struct symtab_and_line sal;
1628 struct breakpoint *breakpoint;
1629 struct cleanup *old_chain;
1631 /* Set up our breakpoint. Set it to be silent as the MI code
1632 for "return_command" will print the frame we returned to. */
1633 sal = find_pc_line (target_pc, 0);
1635 breakpoint = set_momentary_breakpoint (sal, null_frame_id, bp_finish);
1636 breakpoint->silent = 1;
1638 /* So we can clean things up. */
1639 old_chain = make_cleanup_delete_breakpoint (breakpoint);
1641 /* Start up the inferior. */
1642 clear_proceed_status ();
1643 proceed_to_finish = 1;
1644 proceed ((CORE_ADDR) -1, TARGET_SIGNAL_DEFAULT, 0);
1646 /* Perform our cleanups. */
1647 do_cleanups (old_chain);
1649 flush_cached_frames ();
1652 /* After returning to a dummy on the stack, restore the instruction
1653 queue space registers. */
1656 restore_pc_queue (struct frame_saved_regs *fsr)
1658 CORE_ADDR pc = read_pc ();
1659 CORE_ADDR new_pc = read_memory_integer (fsr->regs[PCOQ_HEAD_REGNUM],
1660 TARGET_PTR_BIT / 8);
1661 struct target_waitstatus w;
1664 /* Advance past break instruction in the call dummy. */
1665 write_register (PCOQ_HEAD_REGNUM, pc + 4);
1666 write_register (PCOQ_TAIL_REGNUM, pc + 8);
1668 /* HPUX doesn't let us set the space registers or the space
1669 registers of the PC queue through ptrace. Boo, hiss.
1670 Conveniently, the call dummy has this sequence of instructions
1675 So, load up the registers and single step until we are in the
1678 write_register (21, read_memory_integer (fsr->regs[PCSQ_HEAD_REGNUM],
1680 write_register (22, new_pc);
1682 for (insn_count = 0; insn_count < 3; insn_count++)
1684 /* FIXME: What if the inferior gets a signal right now? Want to
1685 merge this into wait_for_inferior (as a special kind of
1686 watchpoint? By setting a breakpoint at the end? Is there
1687 any other choice? Is there *any* way to do this stuff with
1688 ptrace() or some equivalent?). */
1690 target_wait (inferior_ptid, &w);
1692 if (w.kind == TARGET_WAITKIND_SIGNALLED)
1694 stop_signal = w.value.sig;
1695 terminal_ours_for_output ();
1696 printf_unfiltered ("\nProgram terminated with signal %s, %s.\n",
1697 target_signal_to_name (stop_signal),
1698 target_signal_to_string (stop_signal));
1699 gdb_flush (gdb_stdout);
1703 target_terminal_ours ();
1704 target_fetch_registers (-1);
1709 #ifdef PA20W_CALLING_CONVENTIONS
1711 /* This function pushes a stack frame with arguments as part of the
1712 inferior function calling mechanism.
1714 This is the version for the PA64, in which later arguments appear
1715 at higher addresses. (The stack always grows towards higher
1718 We simply allocate the appropriate amount of stack space and put
1719 arguments into their proper slots. The call dummy code will copy
1720 arguments into registers as needed by the ABI.
1722 This ABI also requires that the caller provide an argument pointer
1723 to the callee, so we do that too. */
1726 hppa_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
1727 int struct_return, CORE_ADDR struct_addr)
1729 /* array of arguments' offsets */
1730 int *offset = (int *) alloca (nargs * sizeof (int));
1732 /* array of arguments' lengths: real lengths in bytes, not aligned to
1734 int *lengths = (int *) alloca (nargs * sizeof (int));
1736 /* The value of SP as it was passed into this function after
1738 CORE_ADDR orig_sp = STACK_ALIGN (sp);
1740 /* The number of stack bytes occupied by the current argument. */
1743 /* The total number of bytes reserved for the arguments. */
1744 int cum_bytes_reserved = 0;
1746 /* Similarly, but aligned. */
1747 int cum_bytes_aligned = 0;
1750 /* Iterate over each argument provided by the user. */
1751 for (i = 0; i < nargs; i++)
1753 struct type *arg_type = VALUE_TYPE (args[i]);
1755 /* Integral scalar values smaller than a register are padded on
1756 the left. We do this by promoting them to full-width,
1757 although the ABI says to pad them with garbage. */
1758 if (is_integral_type (arg_type)
1759 && TYPE_LENGTH (arg_type) < REGISTER_SIZE)
1761 args[i] = value_cast ((TYPE_UNSIGNED (arg_type)
1762 ? builtin_type_unsigned_long
1763 : builtin_type_long),
1765 arg_type = VALUE_TYPE (args[i]);
1768 lengths[i] = TYPE_LENGTH (arg_type);
1770 /* Align the size of the argument to the word size for this
1772 bytes_reserved = (lengths[i] + REGISTER_SIZE - 1) & -REGISTER_SIZE;
1774 offset[i] = cum_bytes_reserved;
1776 /* Aggregates larger than eight bytes (the only types larger
1777 than eight bytes we have) are aligned on a 16-byte boundary,
1778 possibly padded on the right with garbage. This may leave an
1779 empty word on the stack, and thus an unused register, as per
1781 if (bytes_reserved > 8)
1783 /* Round up the offset to a multiple of two slots. */
1784 int new_offset = ((offset[i] + 2*REGISTER_SIZE-1)
1785 & -(2*REGISTER_SIZE));
1787 /* Note the space we've wasted, if any. */
1788 bytes_reserved += new_offset - offset[i];
1789 offset[i] = new_offset;
1792 cum_bytes_reserved += bytes_reserved;
1795 /* CUM_BYTES_RESERVED already accounts for all the arguments
1796 passed by the user. However, the ABIs mandate minimum stack space
1797 allocations for outgoing arguments.
1799 The ABIs also mandate minimum stack alignments which we must
1801 cum_bytes_aligned = STACK_ALIGN (cum_bytes_reserved);
1802 sp += max (cum_bytes_aligned, REG_PARM_STACK_SPACE);
1804 /* Now write each of the args at the proper offset down the stack. */
1805 for (i = 0; i < nargs; i++)
1806 write_memory (orig_sp + offset[i], VALUE_CONTENTS (args[i]), lengths[i]);
1808 /* If a structure has to be returned, set up register 28 to hold its
1811 write_register (28, struct_addr);
1813 /* For the PA64 we must pass a pointer to the outgoing argument list.
1814 The ABI mandates that the pointer should point to the first byte of
1815 storage beyond the register flushback area.
1817 However, the call dummy expects the outgoing argument pointer to
1818 be passed in register %r4. */
1819 write_register (4, orig_sp + REG_PARM_STACK_SPACE);
1821 /* ?!? This needs further work. We need to set up the global data
1822 pointer for this procedure. This assumes the same global pointer
1823 for every procedure. The call dummy expects the dp value to
1824 be passed in register %r6. */
1825 write_register (6, read_register (27));
1827 /* The stack will have 64 bytes of additional space for a frame marker. */
1833 /* This function pushes a stack frame with arguments as part of the
1834 inferior function calling mechanism.
1836 This is the version of the function for the 32-bit PA machines, in
1837 which later arguments appear at lower addresses. (The stack always
1838 grows towards higher addresses.)
1840 We simply allocate the appropriate amount of stack space and put
1841 arguments into their proper slots. The call dummy code will copy
1842 arguments into registers as needed by the ABI. */
1845 hppa_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
1846 int struct_return, CORE_ADDR struct_addr)
1848 /* array of arguments' offsets */
1849 int *offset = (int *) alloca (nargs * sizeof (int));
1851 /* array of arguments' lengths: real lengths in bytes, not aligned to
1853 int *lengths = (int *) alloca (nargs * sizeof (int));
1855 /* The number of stack bytes occupied by the current argument. */
1858 /* The total number of bytes reserved for the arguments. */
1859 int cum_bytes_reserved = 0;
1861 /* Similarly, but aligned. */
1862 int cum_bytes_aligned = 0;
1865 /* Iterate over each argument provided by the user. */
1866 for (i = 0; i < nargs; i++)
1868 lengths[i] = TYPE_LENGTH (VALUE_TYPE (args[i]));
1870 /* Align the size of the argument to the word size for this
1872 bytes_reserved = (lengths[i] + REGISTER_SIZE - 1) & -REGISTER_SIZE;
1874 offset[i] = (cum_bytes_reserved
1875 + (lengths[i] > 4 ? bytes_reserved : lengths[i]));
1877 /* If the argument is a double word argument, then it needs to be
1878 double word aligned. */
1879 if ((bytes_reserved == 2 * REGISTER_SIZE)
1880 && (offset[i] % 2 * REGISTER_SIZE))
1883 /* BYTES_RESERVED is already aligned to the word, so we put
1884 the argument at one word more down the stack.
1886 This will leave one empty word on the stack, and one unused
1887 register as mandated by the ABI. */
1888 new_offset = ((offset[i] + 2 * REGISTER_SIZE - 1)
1889 & -(2 * REGISTER_SIZE));
1891 if ((new_offset - offset[i]) >= 2 * REGISTER_SIZE)
1893 bytes_reserved += REGISTER_SIZE;
1894 offset[i] += REGISTER_SIZE;
1898 cum_bytes_reserved += bytes_reserved;
1902 /* CUM_BYTES_RESERVED already accounts for all the arguments passed
1903 by the user. However, the ABI mandates minimum stack space
1904 allocations for outgoing arguments.
1906 The ABI also mandates minimum stack alignments which we must
1908 cum_bytes_aligned = STACK_ALIGN (cum_bytes_reserved);
1909 sp += max (cum_bytes_aligned, REG_PARM_STACK_SPACE);
1911 /* Now write each of the args at the proper offset down the stack.
1912 ?!? We need to promote values to a full register instead of skipping
1913 words in the stack. */
1914 for (i = 0; i < nargs; i++)
1915 write_memory (sp - offset[i], VALUE_CONTENTS (args[i]), lengths[i]);
1917 /* If a structure has to be returned, set up register 28 to hold its
1920 write_register (28, struct_addr);
1922 /* The stack will have 32 bytes of additional space for a frame marker. */
1928 /* elz: this function returns a value which is built looking at the given address.
1929 It is called from call_function_by_hand, in case we need to return a
1930 value which is larger than 64 bits, and it is stored in the stack rather than
1931 in the registers r28 and r29 or fr4.
1932 This function does the same stuff as value_being_returned in values.c, but
1933 gets the value from the stack rather than from the buffer where all the
1934 registers were saved when the function called completed. */
1936 hppa_value_returned_from_stack (register struct type *valtype, CORE_ADDR addr)
1938 register struct value *val;
1940 val = allocate_value (valtype);
1941 CHECK_TYPEDEF (valtype);
1942 target_read_memory (addr, VALUE_CONTENTS_RAW (val), TYPE_LENGTH (valtype));
1949 /* elz: Used to lookup a symbol in the shared libraries.
1950 This function calls shl_findsym, indirectly through a
1951 call to __d_shl_get. __d_shl_get is in end.c, which is always
1952 linked in by the hp compilers/linkers.
1953 The call to shl_findsym cannot be made directly because it needs
1954 to be active in target address space.
1955 inputs: - minimal symbol pointer for the function we want to look up
1956 - address in target space of the descriptor for the library
1957 where we want to look the symbol up.
1958 This address is retrieved using the
1959 som_solib_get_solib_by_pc function (somsolib.c).
1960 output: - real address in the library of the function.
1961 note: the handle can be null, in which case shl_findsym will look for
1962 the symbol in all the loaded shared libraries.
1963 files to look at if you need reference on this stuff:
1964 dld.c, dld_shl_findsym.c
1966 man entry for shl_findsym */
1969 find_stub_with_shl_get (struct minimal_symbol *function, CORE_ADDR handle)
1971 struct symbol *get_sym, *symbol2;
1972 struct minimal_symbol *buff_minsym, *msymbol;
1974 struct value **args;
1975 struct value *funcval;
1978 int x, namelen, err_value, tmp = -1;
1979 CORE_ADDR endo_buff_addr, value_return_addr, errno_return_addr;
1980 CORE_ADDR stub_addr;
1983 args = alloca (sizeof (struct value *) * 8); /* 6 for the arguments and one null one??? */
1984 funcval = find_function_in_inferior ("__d_shl_get");
1985 get_sym = lookup_symbol ("__d_shl_get", NULL, VAR_NAMESPACE, NULL, NULL);
1986 buff_minsym = lookup_minimal_symbol ("__buffer", NULL, NULL);
1987 msymbol = lookup_minimal_symbol ("__shldp", NULL, NULL);
1988 symbol2 = lookup_symbol ("__shldp", NULL, VAR_NAMESPACE, NULL, NULL);
1989 endo_buff_addr = SYMBOL_VALUE_ADDRESS (buff_minsym);
1990 namelen = strlen (SYMBOL_NAME (function));
1991 value_return_addr = endo_buff_addr + namelen;
1992 ftype = check_typedef (SYMBOL_TYPE (get_sym));
1995 if ((x = value_return_addr % 64) != 0)
1996 value_return_addr = value_return_addr + 64 - x;
1998 errno_return_addr = value_return_addr + 64;
2001 /* set up stuff needed by __d_shl_get in buffer in end.o */
2003 target_write_memory (endo_buff_addr, SYMBOL_NAME (function), namelen);
2005 target_write_memory (value_return_addr, (char *) &tmp, 4);
2007 target_write_memory (errno_return_addr, (char *) &tmp, 4);
2009 target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol),
2010 (char *) &handle, 4);
2012 /* now prepare the arguments for the call */
2014 args[0] = value_from_longest (TYPE_FIELD_TYPE (ftype, 0), 12);
2015 args[1] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 1), SYMBOL_VALUE_ADDRESS (msymbol));
2016 args[2] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 2), endo_buff_addr);
2017 args[3] = value_from_longest (TYPE_FIELD_TYPE (ftype, 3), TYPE_PROCEDURE);
2018 args[4] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 4), value_return_addr);
2019 args[5] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 5), errno_return_addr);
2021 /* now call the function */
2023 val = call_function_by_hand (funcval, 6, args);
2025 /* now get the results */
2027 target_read_memory (errno_return_addr, (char *) &err_value, sizeof (err_value));
2029 target_read_memory (value_return_addr, (char *) &stub_addr, sizeof (stub_addr));
2031 error ("call to __d_shl_get failed, error code is %d", err_value);
2036 /* Cover routine for find_stub_with_shl_get to pass to catch_errors */
2038 cover_find_stub_with_shl_get (PTR args_untyped)
2040 args_for_find_stub *args = args_untyped;
2041 args->return_val = find_stub_with_shl_get (args->msym, args->solib_handle);
2045 /* Insert the specified number of args and function address
2046 into a call sequence of the above form stored at DUMMYNAME.
2048 On the hppa we need to call the stack dummy through $$dyncall.
2049 Therefore our version of FIX_CALL_DUMMY takes an extra argument,
2050 real_pc, which is the location where gdb should start up the
2051 inferior to do the function call.
2053 This has to work across several versions of hpux, bsd, osf1. It has to
2054 work regardless of what compiler was used to build the inferior program.
2055 It should work regardless of whether or not end.o is available. It has
2056 to work even if gdb can not call into the dynamic loader in the inferior
2057 to query it for symbol names and addresses.
2059 Yes, all those cases should work. Luckily code exists to handle most
2060 of them. The complexity is in selecting exactly what scheme should
2061 be used to perform the inferior call.
2063 At the current time this routine is known not to handle cases where
2064 the program was linked with HP's compiler without including end.o.
2066 Please contact Jeff Law (law@cygnus.com) before changing this code. */
2069 hppa_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
2070 struct value **args, struct type *type, int gcc_p)
2072 CORE_ADDR dyncall_addr;
2073 struct minimal_symbol *msymbol;
2074 struct minimal_symbol *trampoline;
2075 int flags = read_register (FLAGS_REGNUM);
2076 struct unwind_table_entry *u = NULL;
2077 CORE_ADDR new_stub = 0;
2078 CORE_ADDR solib_handle = 0;
2080 /* Nonzero if we will use GCC's PLT call routine. This routine must be
2081 passed an import stub, not a PLABEL. It is also necessary to set %r19
2082 (the PIC register) before performing the call.
2084 If zero, then we are using __d_plt_call (HP's PLT call routine) or we
2085 are calling the target directly. When using __d_plt_call we want to
2086 use a PLABEL instead of an import stub. */
2087 int using_gcc_plt_call = 1;
2089 #ifdef GDB_TARGET_IS_HPPA_20W
2090 /* We currently use completely different code for the PA2.0W inferior
2091 function call sequences. This needs to be cleaned up. */
2093 CORE_ADDR pcsqh, pcsqt, pcoqh, pcoqt, sr5;
2094 struct target_waitstatus w;
2098 struct objfile *objfile;
2100 /* We can not modify the PC space queues directly, so we start
2101 up the inferior and execute a couple instructions to set the
2102 space queues so that they point to the call dummy in the stack. */
2103 pcsqh = read_register (PCSQ_HEAD_REGNUM);
2104 sr5 = read_register (SR5_REGNUM);
2107 pcoqh = read_register (PCOQ_HEAD_REGNUM);
2108 pcoqt = read_register (PCOQ_TAIL_REGNUM);
2109 if (target_read_memory (pcoqh, buf, 4) != 0)
2110 error ("Couldn't modify space queue\n");
2111 inst1 = extract_unsigned_integer (buf, 4);
2113 if (target_read_memory (pcoqt, buf, 4) != 0)
2114 error ("Couldn't modify space queue\n");
2115 inst2 = extract_unsigned_integer (buf, 4);
2118 *((int *) buf) = 0xe820d000;
2119 if (target_write_memory (pcoqh, buf, 4) != 0)
2120 error ("Couldn't modify space queue\n");
2123 *((int *) buf) = 0x08000240;
2124 if (target_write_memory (pcoqt, buf, 4) != 0)
2126 *((int *) buf) = inst1;
2127 target_write_memory (pcoqh, buf, 4);
2128 error ("Couldn't modify space queue\n");
2131 write_register (1, pc);
2133 /* Single step twice, the BVE instruction will set the space queue
2134 such that it points to the PC value written immediately above
2135 (ie the call dummy). */
2137 target_wait (inferior_ptid, &w);
2139 target_wait (inferior_ptid, &w);
2141 /* Restore the two instructions at the old PC locations. */
2142 *((int *) buf) = inst1;
2143 target_write_memory (pcoqh, buf, 4);
2144 *((int *) buf) = inst2;
2145 target_write_memory (pcoqt, buf, 4);
2148 /* The call dummy wants the ultimate destination address initially
2150 write_register (5, fun);
2152 /* We need to see if this objfile has a different DP value than our
2153 own (it could be a shared library for example). */
2154 ALL_OBJFILES (objfile)
2156 struct obj_section *s;
2157 obj_private_data_t *obj_private;
2159 /* See if FUN is in any section within this shared library. */
2160 for (s = objfile->sections; s < objfile->sections_end; s++)
2161 if (s->addr <= fun && fun < s->endaddr)
2164 if (s >= objfile->sections_end)
2167 obj_private = (obj_private_data_t *) objfile->obj_private;
2169 /* The DP value may be different for each objfile. But within an
2170 objfile each function uses the same dp value. Thus we do not need
2171 to grope around the opd section looking for dp values.
2173 ?!? This is not strictly correct since we may be in a shared library
2174 and want to call back into the main program. To make that case
2175 work correctly we need to set obj_private->dp for the main program's
2176 objfile, then remove this conditional. */
2177 if (obj_private->dp)
2178 write_register (27, obj_private->dp);
2185 #ifndef GDB_TARGET_IS_HPPA_20W
2186 /* Prefer __gcc_plt_call over the HP supplied routine because
2187 __gcc_plt_call works for any number of arguments. */
2189 if (lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL) == NULL)
2190 using_gcc_plt_call = 0;
2192 msymbol = lookup_minimal_symbol ("$$dyncall", NULL, NULL);
2193 if (msymbol == NULL)
2194 error ("Can't find an address for $$dyncall trampoline");
2196 dyncall_addr = SYMBOL_VALUE_ADDRESS (msymbol);
2198 /* FUN could be a procedure label, in which case we have to get
2199 its real address and the value of its GOT/DP if we plan to
2200 call the routine via gcc_plt_call. */
2201 if ((fun & 0x2) && using_gcc_plt_call)
2203 /* Get the GOT/DP value for the target function. It's
2204 at *(fun+4). Note the call dummy is *NOT* allowed to
2205 trash %r19 before calling the target function. */
2206 write_register (19, read_memory_integer ((fun & ~0x3) + 4,
2209 /* Now get the real address for the function we are calling, it's
2211 fun = (CORE_ADDR) read_memory_integer (fun & ~0x3,
2212 TARGET_PTR_BIT / 8);
2217 #ifndef GDB_TARGET_IS_PA_ELF
2218 /* FUN could be an export stub, the real address of a function, or
2219 a PLABEL. When using gcc's PLT call routine we must call an import
2220 stub rather than the export stub or real function for lazy binding
2223 If we are using the gcc PLT call routine, then we need to
2224 get the import stub for the target function. */
2225 if (using_gcc_plt_call && som_solib_get_got_by_pc (fun))
2227 struct objfile *objfile;
2228 struct minimal_symbol *funsymbol, *stub_symbol;
2229 CORE_ADDR newfun = 0;
2231 funsymbol = lookup_minimal_symbol_by_pc (fun);
2233 error ("Unable to find minimal symbol for target function.\n");
2235 /* Search all the object files for an import symbol with the
2237 ALL_OBJFILES (objfile)
2240 = lookup_minimal_symbol_solib_trampoline
2241 (SYMBOL_NAME (funsymbol), NULL, objfile);
2244 stub_symbol = lookup_minimal_symbol (SYMBOL_NAME (funsymbol),
2247 /* Found a symbol with the right name. */
2250 struct unwind_table_entry *u;
2251 /* It must be a shared library trampoline. */
2252 if (MSYMBOL_TYPE (stub_symbol) != mst_solib_trampoline)
2255 /* It must also be an import stub. */
2256 u = find_unwind_entry (SYMBOL_VALUE (stub_symbol));
2258 || (u->stub_unwind.stub_type != IMPORT
2259 #ifdef GDB_NATIVE_HPUX_11
2260 /* Sigh. The hpux 10.20 dynamic linker will blow
2261 chunks if we perform a call to an unbound function
2262 via the IMPORT_SHLIB stub. The hpux 11.00 dynamic
2263 linker will blow chunks if we do not call the
2264 unbound function via the IMPORT_SHLIB stub.
2266 We currently have no way to select bevahior on just
2267 the target. However, we only support HPUX/SOM in
2268 native mode. So we conditinalize on a native
2269 #ifdef. Ugly. Ugly. Ugly */
2270 && u->stub_unwind.stub_type != IMPORT_SHLIB
2275 /* OK. Looks like the correct import stub. */
2276 newfun = SYMBOL_VALUE (stub_symbol);
2279 /* If we found an IMPORT stub, then we want to stop
2280 searching now. If we found an IMPORT_SHLIB, we want
2281 to continue the search in the hopes that we will find
2283 if (u->stub_unwind.stub_type == IMPORT)
2288 /* Ouch. We did not find an import stub. Make an attempt to
2289 do the right thing instead of just croaking. Most of the
2290 time this will actually work. */
2292 write_register (19, som_solib_get_got_by_pc (fun));
2294 u = find_unwind_entry (fun);
2296 && (u->stub_unwind.stub_type == IMPORT
2297 || u->stub_unwind.stub_type == IMPORT_SHLIB))
2298 trampoline = lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL);
2300 /* If we found the import stub in the shared library, then we have
2301 to set %r19 before we call the stub. */
2302 if (u && u->stub_unwind.stub_type == IMPORT_SHLIB)
2303 write_register (19, som_solib_get_got_by_pc (fun));
2308 /* If we are calling into another load module then have sr4export call the
2309 magic __d_plt_call routine which is linked in from end.o.
2311 You can't use _sr4export to make the call as the value in sp-24 will get
2312 fried and you end up returning to the wrong location. You can't call the
2313 target as the code to bind the PLT entry to a function can't return to a
2316 Also, query the dynamic linker in the inferior to provide a suitable
2317 PLABEL for the target function. */
2318 if (!using_gcc_plt_call)
2322 /* Get a handle for the shared library containing FUN. Given the
2323 handle we can query the shared library for a PLABEL. */
2324 solib_handle = som_solib_get_solib_by_pc (fun);
2328 struct minimal_symbol *fmsymbol = lookup_minimal_symbol_by_pc (fun);
2330 trampoline = lookup_minimal_symbol ("__d_plt_call", NULL, NULL);
2332 if (trampoline == NULL)
2334 error ("Can't find an address for __d_plt_call or __gcc_plt_call trampoline\nSuggest linking executable with -g or compiling with gcc.");
2337 /* This is where sr4export will jump to. */
2338 new_fun = SYMBOL_VALUE_ADDRESS (trampoline);
2340 /* If the function is in a shared library, then call __d_shl_get to
2341 get a PLABEL for the target function. */
2342 new_stub = find_stub_with_shl_get (fmsymbol, solib_handle);
2345 error ("Can't find an import stub for %s", SYMBOL_NAME (fmsymbol));
2347 /* We have to store the address of the stub in __shlib_funcptr. */
2348 msymbol = lookup_minimal_symbol ("__shlib_funcptr", NULL,
2349 (struct objfile *) NULL);
2351 if (msymbol == NULL)
2352 error ("Can't find an address for __shlib_funcptr");
2353 target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol),
2354 (char *) &new_stub, 4);
2356 /* We want sr4export to call __d_plt_call, so we claim it is
2357 the final target. Clear trampoline. */
2363 /* Store upper 21 bits of function address into ldil. fun will either be
2364 the final target (most cases) or __d_plt_call when calling into a shared
2365 library and __gcc_plt_call is not available. */
2366 store_unsigned_integer
2367 (&dummy[FUNC_LDIL_OFFSET],
2369 deposit_21 (fun >> 11,
2370 extract_unsigned_integer (&dummy[FUNC_LDIL_OFFSET],
2371 INSTRUCTION_SIZE)));
2373 /* Store lower 11 bits of function address into ldo */
2374 store_unsigned_integer
2375 (&dummy[FUNC_LDO_OFFSET],
2377 deposit_14 (fun & MASK_11,
2378 extract_unsigned_integer (&dummy[FUNC_LDO_OFFSET],
2379 INSTRUCTION_SIZE)));
2380 #ifdef SR4EXPORT_LDIL_OFFSET
2383 CORE_ADDR trampoline_addr;
2385 /* We may still need sr4export's address too. */
2387 if (trampoline == NULL)
2389 msymbol = lookup_minimal_symbol ("_sr4export", NULL, NULL);
2390 if (msymbol == NULL)
2391 error ("Can't find an address for _sr4export trampoline");
2393 trampoline_addr = SYMBOL_VALUE_ADDRESS (msymbol);
2396 trampoline_addr = SYMBOL_VALUE_ADDRESS (trampoline);
2399 /* Store upper 21 bits of trampoline's address into ldil */
2400 store_unsigned_integer
2401 (&dummy[SR4EXPORT_LDIL_OFFSET],
2403 deposit_21 (trampoline_addr >> 11,
2404 extract_unsigned_integer (&dummy[SR4EXPORT_LDIL_OFFSET],
2405 INSTRUCTION_SIZE)));
2407 /* Store lower 11 bits of trampoline's address into ldo */
2408 store_unsigned_integer
2409 (&dummy[SR4EXPORT_LDO_OFFSET],
2411 deposit_14 (trampoline_addr & MASK_11,
2412 extract_unsigned_integer (&dummy[SR4EXPORT_LDO_OFFSET],
2413 INSTRUCTION_SIZE)));
2417 write_register (22, pc);
2419 /* If we are in a syscall, then we should call the stack dummy
2420 directly. $$dyncall is not needed as the kernel sets up the
2421 space id registers properly based on the value in %r31. In
2422 fact calling $$dyncall will not work because the value in %r22
2423 will be clobbered on the syscall exit path.
2425 Similarly if the current PC is in a shared library. Note however,
2426 this scheme won't work if the shared library isn't mapped into
2427 the same space as the stack. */
2430 #ifndef GDB_TARGET_IS_PA_ELF
2431 else if (som_solib_get_got_by_pc (hppa_target_read_pc (inferior_ptid)))
2435 return dyncall_addr;
2439 /* If the pid is in a syscall, then the FP register is not readable.
2440 We'll return zero in that case, rather than attempting to read it
2441 and cause a warning. */
2444 hppa_read_fp (int pid)
2446 int flags = read_register (FLAGS_REGNUM);
2450 return (CORE_ADDR) 0;
2453 /* This is the only site that may directly read_register () the FP
2454 register. All others must use TARGET_READ_FP (). */
2455 return read_register (FP_REGNUM);
2459 hppa_target_read_fp (void)
2461 return hppa_read_fp (PIDGET (inferior_ptid));
2464 /* Get the PC from %r31 if currently in a syscall. Also mask out privilege
2468 hppa_target_read_pc (ptid_t ptid)
2470 int flags = read_register_pid (FLAGS_REGNUM, ptid);
2472 /* The following test does not belong here. It is OS-specific, and belongs
2474 /* Test SS_INSYSCALL */
2476 return read_register_pid (31, ptid) & ~0x3;
2478 return read_register_pid (PC_REGNUM, ptid) & ~0x3;
2481 /* Write out the PC. If currently in a syscall, then also write the new
2482 PC value into %r31. */
2485 hppa_target_write_pc (CORE_ADDR v, ptid_t ptid)
2487 int flags = read_register_pid (FLAGS_REGNUM, ptid);
2489 /* The following test does not belong here. It is OS-specific, and belongs
2491 /* If in a syscall, then set %r31. Also make sure to get the
2492 privilege bits set correctly. */
2493 /* Test SS_INSYSCALL */
2495 write_register_pid (31, v | 0x3, ptid);
2497 write_register_pid (PC_REGNUM, v, ptid);
2498 write_register_pid (NPC_REGNUM, v + 4, ptid);
2501 /* return the alignment of a type in bytes. Structures have the maximum
2502 alignment required by their fields. */
2505 hppa_alignof (struct type *type)
2507 int max_align, align, i;
2508 CHECK_TYPEDEF (type);
2509 switch (TYPE_CODE (type))
2514 return TYPE_LENGTH (type);
2515 case TYPE_CODE_ARRAY:
2516 return hppa_alignof (TYPE_FIELD_TYPE (type, 0));
2517 case TYPE_CODE_STRUCT:
2518 case TYPE_CODE_UNION:
2520 for (i = 0; i < TYPE_NFIELDS (type); i++)
2522 /* Bit fields have no real alignment. */
2523 /* if (!TYPE_FIELD_BITPOS (type, i)) */
2524 if (!TYPE_FIELD_BITSIZE (type, i)) /* elz: this should be bitsize */
2526 align = hppa_alignof (TYPE_FIELD_TYPE (type, i));
2527 max_align = max (max_align, align);
2536 /* Print the register regnum, or all registers if regnum is -1 */
2539 pa_do_registers_info (int regnum, int fpregs)
2541 char raw_regs[REGISTER_BYTES];
2544 /* Make a copy of gdb's save area (may cause actual
2545 reads from the target). */
2546 for (i = 0; i < NUM_REGS; i++)
2547 frame_register_read (deprecated_selected_frame, i, raw_regs + REGISTER_BYTE (i));
2550 pa_print_registers (raw_regs, regnum, fpregs);
2551 else if (regnum < FP4_REGNUM)
2555 /* Why is the value not passed through "extract_signed_integer"
2556 as in "pa_print_registers" below? */
2557 pa_register_look_aside (raw_regs, regnum, ®_val[0]);
2561 printf_unfiltered ("%s %lx\n", REGISTER_NAME (regnum), reg_val[1]);
2565 /* Fancy % formats to prevent leading zeros. */
2566 if (reg_val[0] == 0)
2567 printf_unfiltered ("%s %lx\n", REGISTER_NAME (regnum), reg_val[1]);
2569 printf_unfiltered ("%s %lx%8.8lx\n", REGISTER_NAME (regnum),
2570 reg_val[0], reg_val[1]);
2574 /* Note that real floating point values only start at
2575 FP4_REGNUM. FP0 and up are just status and error
2576 registers, which have integral (bit) values. */
2577 pa_print_fp_reg (regnum);
2580 /********** new function ********************/
2582 pa_do_strcat_registers_info (int regnum, int fpregs, struct ui_file *stream,
2583 enum precision_type precision)
2585 char raw_regs[REGISTER_BYTES];
2588 /* Make a copy of gdb's save area (may cause actual
2589 reads from the target). */
2590 for (i = 0; i < NUM_REGS; i++)
2591 frame_register_read (deprecated_selected_frame, i, raw_regs + REGISTER_BYTE (i));
2594 pa_strcat_registers (raw_regs, regnum, fpregs, stream);
2596 else if (regnum < FP4_REGNUM)
2600 /* Why is the value not passed through "extract_signed_integer"
2601 as in "pa_print_registers" below? */
2602 pa_register_look_aside (raw_regs, regnum, ®_val[0]);
2606 fprintf_unfiltered (stream, "%s %lx", REGISTER_NAME (regnum), reg_val[1]);
2610 /* Fancy % formats to prevent leading zeros. */
2611 if (reg_val[0] == 0)
2612 fprintf_unfiltered (stream, "%s %lx", REGISTER_NAME (regnum),
2615 fprintf_unfiltered (stream, "%s %lx%8.8lx", REGISTER_NAME (regnum),
2616 reg_val[0], reg_val[1]);
2620 /* Note that real floating point values only start at
2621 FP4_REGNUM. FP0 and up are just status and error
2622 registers, which have integral (bit) values. */
2623 pa_strcat_fp_reg (regnum, stream, precision);
2626 /* If this is a PA2.0 machine, fetch the real 64-bit register
2627 value. Otherwise use the info from gdb's saved register area.
2629 Note that reg_val is really expected to be an array of longs,
2630 with two elements. */
2632 pa_register_look_aside (char *raw_regs, int regnum, long *raw_val)
2634 static int know_which = 0; /* False */
2637 unsigned int offset;
2642 char buf[MAX_REGISTER_RAW_SIZE];
2647 if (CPU_PA_RISC2_0 == sysconf (_SC_CPU_VERSION))
2652 know_which = 1; /* True */
2660 raw_val[1] = *(long *) (raw_regs + REGISTER_BYTE (regnum));
2664 /* Code below copied from hppah-nat.c, with fixes for wide
2665 registers, using different area of save_state, etc. */
2666 if (regnum == FLAGS_REGNUM || regnum >= FP0_REGNUM ||
2667 !HAVE_STRUCT_SAVE_STATE_T || !HAVE_STRUCT_MEMBER_SS_WIDE)
2669 /* Use narrow regs area of save_state and default macro. */
2670 offset = U_REGS_OFFSET;
2671 regaddr = register_addr (regnum, offset);
2676 /* Use wide regs area, and calculate registers as 8 bytes wide.
2678 We'd like to do this, but current version of "C" doesn't
2681 offset = offsetof(save_state_t, ss_wide);
2683 Note that to avoid "C" doing typed pointer arithmetic, we
2684 have to cast away the type in our offset calculation:
2685 otherwise we get an offset of 1! */
2687 /* NB: save_state_t is not available before HPUX 9.
2688 The ss_wide field is not available previous to HPUX 10.20,
2689 so to avoid compile-time warnings, we only compile this for
2690 PA 2.0 processors. This control path should only be followed
2691 if we're debugging a PA 2.0 processor, so this should not cause
2694 /* #if the following code out so that this file can still be
2695 compiled on older HPUX boxes (< 10.20) which don't have
2696 this structure/structure member. */
2697 #if HAVE_STRUCT_SAVE_STATE_T == 1 && HAVE_STRUCT_MEMBER_SS_WIDE == 1
2700 offset = ((int) &temp.ss_wide) - ((int) &temp);
2701 regaddr = offset + regnum * 8;
2706 for (i = start; i < 2; i++)
2709 raw_val[i] = call_ptrace (PT_RUREGS, PIDGET (inferior_ptid),
2710 (PTRACE_ARG3_TYPE) regaddr, 0);
2713 /* Warning, not error, in case we are attached; sometimes the
2714 kernel doesn't let us at the registers. */
2715 char *err = safe_strerror (errno);
2716 char *msg = alloca (strlen (err) + 128);
2717 sprintf (msg, "reading register %s: %s", REGISTER_NAME (regnum), err);
2722 regaddr += sizeof (long);
2725 if (regnum == PCOQ_HEAD_REGNUM || regnum == PCOQ_TAIL_REGNUM)
2726 raw_val[1] &= ~0x3; /* I think we're masking out space bits */
2732 /* "Info all-reg" command */
2735 pa_print_registers (char *raw_regs, int regnum, int fpregs)
2738 /* Alas, we are compiled so that "long long" is 32 bits */
2741 int rows = 48, columns = 2;
2743 for (i = 0; i < rows; i++)
2745 for (j = 0; j < columns; j++)
2747 /* We display registers in column-major order. */
2748 int regnum = i + j * rows;
2750 /* Q: Why is the value passed through "extract_signed_integer",
2751 while above, in "pa_do_registers_info" it isn't?
2753 pa_register_look_aside (raw_regs, regnum, &raw_val[0]);
2755 /* Even fancier % formats to prevent leading zeros
2756 and still maintain the output in columns. */
2759 /* Being big-endian, on this machine the low bits
2760 (the ones we want to look at) are in the second longword. */
2761 long_val = extract_signed_integer (&raw_val[1], 4);
2762 printf_filtered ("%10.10s: %8lx ",
2763 REGISTER_NAME (regnum), long_val);
2767 /* raw_val = extract_signed_integer(&raw_val, 8); */
2768 if (raw_val[0] == 0)
2769 printf_filtered ("%10.10s: %8lx ",
2770 REGISTER_NAME (regnum), raw_val[1]);
2772 printf_filtered ("%10.10s: %8lx%8.8lx ",
2773 REGISTER_NAME (regnum),
2774 raw_val[0], raw_val[1]);
2777 printf_unfiltered ("\n");
2781 for (i = FP4_REGNUM; i < NUM_REGS; i++) /* FP4_REGNUM == 72 */
2782 pa_print_fp_reg (i);
2785 /************* new function ******************/
2787 pa_strcat_registers (char *raw_regs, int regnum, int fpregs,
2788 struct ui_file *stream)
2791 long raw_val[2]; /* Alas, we are compiled so that "long long" is 32 bits */
2793 enum precision_type precision;
2795 precision = unspecified_precision;
2797 for (i = 0; i < 18; i++)
2799 for (j = 0; j < 4; j++)
2801 /* Q: Why is the value passed through "extract_signed_integer",
2802 while above, in "pa_do_registers_info" it isn't?
2804 pa_register_look_aside (raw_regs, i + (j * 18), &raw_val[0]);
2806 /* Even fancier % formats to prevent leading zeros
2807 and still maintain the output in columns. */
2810 /* Being big-endian, on this machine the low bits
2811 (the ones we want to look at) are in the second longword. */
2812 long_val = extract_signed_integer (&raw_val[1], 4);
2813 fprintf_filtered (stream, "%8.8s: %8lx ",
2814 REGISTER_NAME (i + (j * 18)), long_val);
2818 /* raw_val = extract_signed_integer(&raw_val, 8); */
2819 if (raw_val[0] == 0)
2820 fprintf_filtered (stream, "%8.8s: %8lx ",
2821 REGISTER_NAME (i + (j * 18)), raw_val[1]);
2823 fprintf_filtered (stream, "%8.8s: %8lx%8.8lx ",
2824 REGISTER_NAME (i + (j * 18)), raw_val[0],
2828 fprintf_unfiltered (stream, "\n");
2832 for (i = FP4_REGNUM; i < NUM_REGS; i++) /* FP4_REGNUM == 72 */
2833 pa_strcat_fp_reg (i, stream, precision);
2837 pa_print_fp_reg (int i)
2839 char raw_buffer[MAX_REGISTER_RAW_SIZE];
2840 char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
2842 /* Get 32bits of data. */
2843 frame_register_read (deprecated_selected_frame, i, raw_buffer);
2845 /* Put it in the buffer. No conversions are ever necessary. */
2846 memcpy (virtual_buffer, raw_buffer, REGISTER_RAW_SIZE (i));
2848 fputs_filtered (REGISTER_NAME (i), gdb_stdout);
2849 print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), gdb_stdout);
2850 fputs_filtered ("(single precision) ", gdb_stdout);
2852 val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0, gdb_stdout, 0,
2853 1, 0, Val_pretty_default);
2854 printf_filtered ("\n");
2856 /* If "i" is even, then this register can also be a double-precision
2857 FP register. Dump it out as such. */
2860 /* Get the data in raw format for the 2nd half. */
2861 frame_register_read (deprecated_selected_frame, i + 1, raw_buffer);
2863 /* Copy it into the appropriate part of the virtual buffer. */
2864 memcpy (virtual_buffer + REGISTER_RAW_SIZE (i), raw_buffer,
2865 REGISTER_RAW_SIZE (i));
2867 /* Dump it as a double. */
2868 fputs_filtered (REGISTER_NAME (i), gdb_stdout);
2869 print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), gdb_stdout);
2870 fputs_filtered ("(double precision) ", gdb_stdout);
2872 val_print (builtin_type_double, virtual_buffer, 0, 0, gdb_stdout, 0,
2873 1, 0, Val_pretty_default);
2874 printf_filtered ("\n");
2878 /*************** new function ***********************/
2880 pa_strcat_fp_reg (int i, struct ui_file *stream, enum precision_type precision)
2882 char raw_buffer[MAX_REGISTER_RAW_SIZE];
2883 char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
2885 fputs_filtered (REGISTER_NAME (i), stream);
2886 print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), stream);
2888 /* Get 32bits of data. */
2889 frame_register_read (deprecated_selected_frame, i, raw_buffer);
2891 /* Put it in the buffer. No conversions are ever necessary. */
2892 memcpy (virtual_buffer, raw_buffer, REGISTER_RAW_SIZE (i));
2894 if (precision == double_precision && (i % 2) == 0)
2897 char raw_buf[MAX_REGISTER_RAW_SIZE];
2899 /* Get the data in raw format for the 2nd half. */
2900 frame_register_read (deprecated_selected_frame, i + 1, raw_buf);
2902 /* Copy it into the appropriate part of the virtual buffer. */
2903 memcpy (virtual_buffer + REGISTER_RAW_SIZE (i), raw_buf, REGISTER_RAW_SIZE (i));
2905 val_print (builtin_type_double, virtual_buffer, 0, 0, stream, 0,
2906 1, 0, Val_pretty_default);
2911 val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0, stream, 0,
2912 1, 0, Val_pretty_default);
2917 /* Return one if PC is in the call path of a trampoline, else return zero.
2919 Note we return one for *any* call trampoline (long-call, arg-reloc), not
2920 just shared library trampolines (import, export). */
2923 hppa_in_solib_call_trampoline (CORE_ADDR pc, char *name)
2925 struct minimal_symbol *minsym;
2926 struct unwind_table_entry *u;
2927 static CORE_ADDR dyncall = 0;
2928 static CORE_ADDR sr4export = 0;
2930 #ifdef GDB_TARGET_IS_HPPA_20W
2931 /* PA64 has a completely different stub/trampoline scheme. Is it
2932 better? Maybe. It's certainly harder to determine with any
2933 certainty that we are in a stub because we can not refer to the
2936 The heuristic is simple. Try to lookup the current PC value in th
2937 minimal symbol table. If that fails, then assume we are not in a
2940 Then see if the PC value falls within the section bounds for the
2941 section containing the minimal symbol we found in the first
2942 step. If it does, then assume we are not in a stub and return.
2944 Finally peek at the instructions to see if they look like a stub. */
2946 struct minimal_symbol *minsym;
2951 minsym = lookup_minimal_symbol_by_pc (pc);
2955 sec = SYMBOL_BFD_SECTION (minsym);
2958 && sec->vma + sec->_cooked_size < pc)
2961 /* We might be in a stub. Peek at the instructions. Stubs are 3
2962 instructions long. */
2963 insn = read_memory_integer (pc, 4);
2965 /* Find out where we think we are within the stub. */
2966 if ((insn & 0xffffc00e) == 0x53610000)
2968 else if ((insn & 0xffffffff) == 0xe820d000)
2970 else if ((insn & 0xffffc00e) == 0x537b0000)
2975 /* Now verify each insn in the range looks like a stub instruction. */
2976 insn = read_memory_integer (addr, 4);
2977 if ((insn & 0xffffc00e) != 0x53610000)
2980 /* Now verify each insn in the range looks like a stub instruction. */
2981 insn = read_memory_integer (addr + 4, 4);
2982 if ((insn & 0xffffffff) != 0xe820d000)
2985 /* Now verify each insn in the range looks like a stub instruction. */
2986 insn = read_memory_integer (addr + 8, 4);
2987 if ((insn & 0xffffc00e) != 0x537b0000)
2990 /* Looks like a stub. */
2995 /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a
2998 /* First see if PC is in one of the two C-library trampolines. */
3001 minsym = lookup_minimal_symbol ("$$dyncall", NULL, NULL);
3003 dyncall = SYMBOL_VALUE_ADDRESS (minsym);
3010 minsym = lookup_minimal_symbol ("_sr4export", NULL, NULL);
3012 sr4export = SYMBOL_VALUE_ADDRESS (minsym);
3017 if (pc == dyncall || pc == sr4export)
3020 minsym = lookup_minimal_symbol_by_pc (pc);
3021 if (minsym && strcmp (SYMBOL_NAME (minsym), ".stub") == 0)
3024 /* Get the unwind descriptor corresponding to PC, return zero
3025 if no unwind was found. */
3026 u = find_unwind_entry (pc);
3030 /* If this isn't a linker stub, then return now. */
3031 if (u->stub_unwind.stub_type == 0)
3034 /* By definition a long-branch stub is a call stub. */
3035 if (u->stub_unwind.stub_type == LONG_BRANCH)
3038 /* The call and return path execute the same instructions within
3039 an IMPORT stub! So an IMPORT stub is both a call and return
3041 if (u->stub_unwind.stub_type == IMPORT)
3044 /* Parameter relocation stubs always have a call path and may have a
3046 if (u->stub_unwind.stub_type == PARAMETER_RELOCATION
3047 || u->stub_unwind.stub_type == EXPORT)
3051 /* Search forward from the current PC until we hit a branch
3052 or the end of the stub. */
3053 for (addr = pc; addr <= u->region_end; addr += 4)
3057 insn = read_memory_integer (addr, 4);
3059 /* Does it look like a bl? If so then it's the call path, if
3060 we find a bv or be first, then we're on the return path. */
3061 if ((insn & 0xfc00e000) == 0xe8000000)
3063 else if ((insn & 0xfc00e001) == 0xe800c000
3064 || (insn & 0xfc000000) == 0xe0000000)
3068 /* Should never happen. */
3069 warning ("Unable to find branch in parameter relocation stub.\n");
3073 /* Unknown stub type. For now, just return zero. */
3077 /* Return one if PC is in the return path of a trampoline, else return zero.
3079 Note we return one for *any* call trampoline (long-call, arg-reloc), not
3080 just shared library trampolines (import, export). */
3083 hppa_in_solib_return_trampoline (CORE_ADDR pc, char *name)
3085 struct unwind_table_entry *u;
3087 /* Get the unwind descriptor corresponding to PC, return zero
3088 if no unwind was found. */
3089 u = find_unwind_entry (pc);
3093 /* If this isn't a linker stub or it's just a long branch stub, then
3095 if (u->stub_unwind.stub_type == 0 || u->stub_unwind.stub_type == LONG_BRANCH)
3098 /* The call and return path execute the same instructions within
3099 an IMPORT stub! So an IMPORT stub is both a call and return
3101 if (u->stub_unwind.stub_type == IMPORT)
3104 /* Parameter relocation stubs always have a call path and may have a
3106 if (u->stub_unwind.stub_type == PARAMETER_RELOCATION
3107 || u->stub_unwind.stub_type == EXPORT)
3111 /* Search forward from the current PC until we hit a branch
3112 or the end of the stub. */
3113 for (addr = pc; addr <= u->region_end; addr += 4)
3117 insn = read_memory_integer (addr, 4);
3119 /* Does it look like a bl? If so then it's the call path, if
3120 we find a bv or be first, then we're on the return path. */
3121 if ((insn & 0xfc00e000) == 0xe8000000)
3123 else if ((insn & 0xfc00e001) == 0xe800c000
3124 || (insn & 0xfc000000) == 0xe0000000)
3128 /* Should never happen. */
3129 warning ("Unable to find branch in parameter relocation stub.\n");
3133 /* Unknown stub type. For now, just return zero. */
3138 /* Figure out if PC is in a trampoline, and if so find out where
3139 the trampoline will jump to. If not in a trampoline, return zero.
3141 Simple code examination probably is not a good idea since the code
3142 sequences in trampolines can also appear in user code.
3144 We use unwinds and information from the minimal symbol table to
3145 determine when we're in a trampoline. This won't work for ELF
3146 (yet) since it doesn't create stub unwind entries. Whether or
3147 not ELF will create stub unwinds or normal unwinds for linker
3148 stubs is still being debated.
3150 This should handle simple calls through dyncall or sr4export,
3151 long calls, argument relocation stubs, and dyncall/sr4export
3152 calling an argument relocation stub. It even handles some stubs
3153 used in dynamic executables. */
3156 hppa_skip_trampoline_code (CORE_ADDR pc)
3159 long prev_inst, curr_inst, loc;
3160 static CORE_ADDR dyncall = 0;
3161 static CORE_ADDR dyncall_external = 0;
3162 static CORE_ADDR sr4export = 0;
3163 struct minimal_symbol *msym;
3164 struct unwind_table_entry *u;
3166 /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a
3171 msym = lookup_minimal_symbol ("$$dyncall", NULL, NULL);
3173 dyncall = SYMBOL_VALUE_ADDRESS (msym);
3178 if (!dyncall_external)
3180 msym = lookup_minimal_symbol ("$$dyncall_external", NULL, NULL);
3182 dyncall_external = SYMBOL_VALUE_ADDRESS (msym);
3184 dyncall_external = -1;
3189 msym = lookup_minimal_symbol ("_sr4export", NULL, NULL);
3191 sr4export = SYMBOL_VALUE_ADDRESS (msym);
3196 /* Addresses passed to dyncall may *NOT* be the actual address
3197 of the function. So we may have to do something special. */
3200 pc = (CORE_ADDR) read_register (22);
3202 /* If bit 30 (counting from the left) is on, then pc is the address of
3203 the PLT entry for this function, not the address of the function
3204 itself. Bit 31 has meaning too, but only for MPE. */
3206 pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8);
3208 if (pc == dyncall_external)
3210 pc = (CORE_ADDR) read_register (22);
3211 pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8);
3213 else if (pc == sr4export)
3214 pc = (CORE_ADDR) (read_register (22));
3216 /* Get the unwind descriptor corresponding to PC, return zero
3217 if no unwind was found. */
3218 u = find_unwind_entry (pc);
3222 /* If this isn't a linker stub, then return now. */
3223 /* elz: attention here! (FIXME) because of a compiler/linker
3224 error, some stubs which should have a non zero stub_unwind.stub_type
3225 have unfortunately a value of zero. So this function would return here
3226 as if we were not in a trampoline. To fix this, we go look at the partial
3227 symbol information, which reports this guy as a stub.
3228 (FIXME): Unfortunately, we are not that lucky: it turns out that the
3229 partial symbol information is also wrong sometimes. This is because
3230 when it is entered (somread.c::som_symtab_read()) it can happen that
3231 if the type of the symbol (from the som) is Entry, and the symbol is
3232 in a shared library, then it can also be a trampoline. This would
3233 be OK, except that I believe the way they decide if we are ina shared library
3234 does not work. SOOOO..., even if we have a regular function w/o trampolines
3235 its minimal symbol can be assigned type mst_solib_trampoline.
3236 Also, if we find that the symbol is a real stub, then we fix the unwind
3237 descriptor, and define the stub type to be EXPORT.
3238 Hopefully this is correct most of the times. */
3239 if (u->stub_unwind.stub_type == 0)
3242 /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed
3243 we can delete all the code which appears between the lines */
3244 /*--------------------------------------------------------------------------*/
3245 msym = lookup_minimal_symbol_by_pc (pc);
3247 if (msym == NULL || MSYMBOL_TYPE (msym) != mst_solib_trampoline)
3248 return orig_pc == pc ? 0 : pc & ~0x3;
3250 else if (msym != NULL && MSYMBOL_TYPE (msym) == mst_solib_trampoline)
3252 struct objfile *objfile;
3253 struct minimal_symbol *msymbol;
3254 int function_found = 0;
3256 /* go look if there is another minimal symbol with the same name as
3257 this one, but with type mst_text. This would happen if the msym
3258 is an actual trampoline, in which case there would be another
3259 symbol with the same name corresponding to the real function */
3261 ALL_MSYMBOLS (objfile, msymbol)
3263 if (MSYMBOL_TYPE (msymbol) == mst_text
3264 && STREQ (SYMBOL_NAME (msymbol), SYMBOL_NAME (msym)))
3272 /* the type of msym is correct (mst_solib_trampoline), but
3273 the unwind info is wrong, so set it to the correct value */
3274 u->stub_unwind.stub_type = EXPORT;
3276 /* the stub type info in the unwind is correct (this is not a
3277 trampoline), but the msym type information is wrong, it
3278 should be mst_text. So we need to fix the msym, and also
3279 get out of this function */
3281 MSYMBOL_TYPE (msym) = mst_text;
3282 return orig_pc == pc ? 0 : pc & ~0x3;
3286 /*--------------------------------------------------------------------------*/
3289 /* It's a stub. Search for a branch and figure out where it goes.
3290 Note we have to handle multi insn branch sequences like ldil;ble.
3291 Most (all?) other branches can be determined by examining the contents
3292 of certain registers and the stack. */
3299 /* Make sure we haven't walked outside the range of this stub. */
3300 if (u != find_unwind_entry (loc))
3302 warning ("Unable to find branch in linker stub");
3303 return orig_pc == pc ? 0 : pc & ~0x3;
3306 prev_inst = curr_inst;
3307 curr_inst = read_memory_integer (loc, 4);
3309 /* Does it look like a branch external using %r1? Then it's the
3310 branch from the stub to the actual function. */
3311 if ((curr_inst & 0xffe0e000) == 0xe0202000)
3313 /* Yup. See if the previous instruction loaded
3314 a value into %r1. If so compute and return the jump address. */
3315 if ((prev_inst & 0xffe00000) == 0x20200000)
3316 return (extract_21 (prev_inst) + extract_17 (curr_inst)) & ~0x3;
3319 warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1).");
3320 return orig_pc == pc ? 0 : pc & ~0x3;
3324 /* Does it look like a be 0(sr0,%r21)? OR
3325 Does it look like a be, n 0(sr0,%r21)? OR
3326 Does it look like a bve (r21)? (this is on PA2.0)
3327 Does it look like a bve, n(r21)? (this is also on PA2.0)
3328 That's the branch from an
3329 import stub to an export stub.
3331 It is impossible to determine the target of the branch via
3332 simple examination of instructions and/or data (consider
3333 that the address in the plabel may be the address of the
3334 bind-on-reference routine in the dynamic loader).
3336 So we have try an alternative approach.
3338 Get the name of the symbol at our current location; it should
3339 be a stub symbol with the same name as the symbol in the
3342 Then lookup a minimal symbol with the same name; we should
3343 get the minimal symbol for the target routine in the shared
3344 library as those take precedence of import/export stubs. */
3345 if ((curr_inst == 0xe2a00000) ||
3346 (curr_inst == 0xe2a00002) ||
3347 (curr_inst == 0xeaa0d000) ||
3348 (curr_inst == 0xeaa0d002))
3350 struct minimal_symbol *stubsym, *libsym;
3352 stubsym = lookup_minimal_symbol_by_pc (loc);
3353 if (stubsym == NULL)
3355 warning ("Unable to find symbol for 0x%lx", loc);
3356 return orig_pc == pc ? 0 : pc & ~0x3;
3359 libsym = lookup_minimal_symbol (SYMBOL_NAME (stubsym), NULL, NULL);
3362 warning ("Unable to find library symbol for %s\n",
3363 SYMBOL_NAME (stubsym));
3364 return orig_pc == pc ? 0 : pc & ~0x3;
3367 return SYMBOL_VALUE (libsym);
3370 /* Does it look like bl X,%rp or bl X,%r0? Another way to do a
3371 branch from the stub to the actual function. */
3373 else if ((curr_inst & 0xffe0e000) == 0xe8400000
3374 || (curr_inst & 0xffe0e000) == 0xe8000000
3375 || (curr_inst & 0xffe0e000) == 0xe800A000)
3376 return (loc + extract_17 (curr_inst) + 8) & ~0x3;
3378 /* Does it look like bv (rp)? Note this depends on the
3379 current stack pointer being the same as the stack
3380 pointer in the stub itself! This is a branch on from the
3381 stub back to the original caller. */
3382 /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */
3383 else if ((curr_inst & 0xffe0f000) == 0xe840c000)
3385 /* Yup. See if the previous instruction loaded
3387 if (prev_inst == 0x4bc23ff1)
3388 return (read_memory_integer
3389 (read_register (SP_REGNUM) - 8, 4)) & ~0x3;
3392 warning ("Unable to find restore of %%rp before bv (%%rp).");
3393 return orig_pc == pc ? 0 : pc & ~0x3;
3397 /* elz: added this case to capture the new instruction
3398 at the end of the return part of an export stub used by
3399 the PA2.0: BVE, n (rp) */
3400 else if ((curr_inst & 0xffe0f000) == 0xe840d000)
3402 return (read_memory_integer
3403 (read_register (SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3;
3406 /* What about be,n 0(sr0,%rp)? It's just another way we return to
3407 the original caller from the stub. Used in dynamic executables. */
3408 else if (curr_inst == 0xe0400002)
3410 /* The value we jump to is sitting in sp - 24. But that's
3411 loaded several instructions before the be instruction.
3412 I guess we could check for the previous instruction being
3413 mtsp %r1,%sr0 if we want to do sanity checking. */
3414 return (read_memory_integer
3415 (read_register (SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3;
3418 /* Haven't found the branch yet, but we're still in the stub.
3425 /* For the given instruction (INST), return any adjustment it makes
3426 to the stack pointer or zero for no adjustment.
3428 This only handles instructions commonly found in prologues. */
3431 prologue_inst_adjust_sp (unsigned long inst)
3433 /* This must persist across calls. */
3434 static int save_high21;
3436 /* The most common way to perform a stack adjustment ldo X(sp),sp */
3437 if ((inst & 0xffffc000) == 0x37de0000)
3438 return extract_14 (inst);
3441 if ((inst & 0xffe00000) == 0x6fc00000)
3442 return extract_14 (inst);
3444 /* std,ma X,D(sp) */
3445 if ((inst & 0xffe00008) == 0x73c00008)
3446 return (inst & 0x1 ? -1 << 13 : 0) | (((inst >> 4) & 0x3ff) << 3);
3448 /* addil high21,%r1; ldo low11,(%r1),%r30)
3449 save high bits in save_high21 for later use. */
3450 if ((inst & 0xffe00000) == 0x28200000)
3452 save_high21 = extract_21 (inst);
3456 if ((inst & 0xffff0000) == 0x343e0000)
3457 return save_high21 + extract_14 (inst);
3459 /* fstws as used by the HP compilers. */
3460 if ((inst & 0xffffffe0) == 0x2fd01220)
3461 return extract_5_load (inst);
3463 /* No adjustment. */
3467 /* Return nonzero if INST is a branch of some kind, else return zero. */
3470 is_branch (unsigned long inst)
3499 /* Return the register number for a GR which is saved by INST or
3500 zero it INST does not save a GR. */
3503 inst_saves_gr (unsigned long inst)
3505 /* Does it look like a stw? */
3506 if ((inst >> 26) == 0x1a || (inst >> 26) == 0x1b
3507 || (inst >> 26) == 0x1f
3508 || ((inst >> 26) == 0x1f
3509 && ((inst >> 6) == 0xa)))
3510 return extract_5R_store (inst);
3512 /* Does it look like a std? */
3513 if ((inst >> 26) == 0x1c
3514 || ((inst >> 26) == 0x03
3515 && ((inst >> 6) & 0xf) == 0xb))
3516 return extract_5R_store (inst);
3518 /* Does it look like a stwm? GCC & HPC may use this in prologues. */
3519 if ((inst >> 26) == 0x1b)
3520 return extract_5R_store (inst);
3522 /* Does it look like sth or stb? HPC versions 9.0 and later use these
3524 if ((inst >> 26) == 0x19 || (inst >> 26) == 0x18
3525 || ((inst >> 26) == 0x3
3526 && (((inst >> 6) & 0xf) == 0x8
3527 || (inst >> 6) & 0xf) == 0x9))
3528 return extract_5R_store (inst);
3533 /* Return the register number for a FR which is saved by INST or
3534 zero it INST does not save a FR.
3536 Note we only care about full 64bit register stores (that's the only
3537 kind of stores the prologue will use).
3539 FIXME: What about argument stores with the HP compiler in ANSI mode? */
3542 inst_saves_fr (unsigned long inst)
3544 /* is this an FSTD ? */
3545 if ((inst & 0xfc00dfc0) == 0x2c001200)
3546 return extract_5r_store (inst);
3547 if ((inst & 0xfc000002) == 0x70000002)
3548 return extract_5R_store (inst);
3549 /* is this an FSTW ? */
3550 if ((inst & 0xfc00df80) == 0x24001200)
3551 return extract_5r_store (inst);
3552 if ((inst & 0xfc000002) == 0x7c000000)
3553 return extract_5R_store (inst);
3557 /* Advance PC across any function entry prologue instructions
3558 to reach some "real" code.
3560 Use information in the unwind table to determine what exactly should
3561 be in the prologue. */
3565 skip_prologue_hard_way (CORE_ADDR pc)
3568 CORE_ADDR orig_pc = pc;
3569 unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp;
3570 unsigned long args_stored, status, i, restart_gr, restart_fr;
3571 struct unwind_table_entry *u;
3577 u = find_unwind_entry (pc);
3581 /* If we are not at the beginning of a function, then return now. */
3582 if ((pc & ~0x3) != u->region_start)
3585 /* This is how much of a frame adjustment we need to account for. */
3586 stack_remaining = u->Total_frame_size << 3;
3588 /* Magic register saves we want to know about. */
3589 save_rp = u->Save_RP;
3590 save_sp = u->Save_SP;
3592 /* An indication that args may be stored into the stack. Unfortunately
3593 the HPUX compilers tend to set this in cases where no args were
3597 /* Turn the Entry_GR field into a bitmask. */
3599 for (i = 3; i < u->Entry_GR + 3; i++)
3601 /* Frame pointer gets saved into a special location. */
3602 if (u->Save_SP && i == FP_REGNUM)
3605 save_gr |= (1 << i);
3607 save_gr &= ~restart_gr;
3609 /* Turn the Entry_FR field into a bitmask too. */
3611 for (i = 12; i < u->Entry_FR + 12; i++)
3612 save_fr |= (1 << i);
3613 save_fr &= ~restart_fr;
3615 /* Loop until we find everything of interest or hit a branch.
3617 For unoptimized GCC code and for any HP CC code this will never ever
3618 examine any user instructions.
3620 For optimzied GCC code we're faced with problems. GCC will schedule
3621 its prologue and make prologue instructions available for delay slot
3622 filling. The end result is user code gets mixed in with the prologue
3623 and a prologue instruction may be in the delay slot of the first branch
3626 Some unexpected things are expected with debugging optimized code, so
3627 we allow this routine to walk past user instructions in optimized
3629 while (save_gr || save_fr || save_rp || save_sp || stack_remaining > 0
3632 unsigned int reg_num;
3633 unsigned long old_stack_remaining, old_save_gr, old_save_fr;
3634 unsigned long old_save_rp, old_save_sp, next_inst;
3636 /* Save copies of all the triggers so we can compare them later
3638 old_save_gr = save_gr;
3639 old_save_fr = save_fr;
3640 old_save_rp = save_rp;
3641 old_save_sp = save_sp;
3642 old_stack_remaining = stack_remaining;
3644 status = target_read_memory (pc, buf, 4);
3645 inst = extract_unsigned_integer (buf, 4);
3651 /* Note the interesting effects of this instruction. */
3652 stack_remaining -= prologue_inst_adjust_sp (inst);
3654 /* There are limited ways to store the return pointer into the
3656 if (inst == 0x6bc23fd9 || inst == 0x0fc212c1)
3659 /* These are the only ways we save SP into the stack. At this time
3660 the HP compilers never bother to save SP into the stack. */
3661 if ((inst & 0xffffc000) == 0x6fc10000
3662 || (inst & 0xffffc00c) == 0x73c10008)
3665 /* Are we loading some register with an offset from the argument
3667 if ((inst & 0xffe00000) == 0x37a00000
3668 || (inst & 0xffffffe0) == 0x081d0240)
3674 /* Account for general and floating-point register saves. */
3675 reg_num = inst_saves_gr (inst);
3676 save_gr &= ~(1 << reg_num);
3678 /* Ugh. Also account for argument stores into the stack.
3679 Unfortunately args_stored only tells us that some arguments
3680 where stored into the stack. Not how many or what kind!
3682 This is a kludge as on the HP compiler sets this bit and it
3683 never does prologue scheduling. So once we see one, skip past
3684 all of them. We have similar code for the fp arg stores below.
3686 FIXME. Can still die if we have a mix of GR and FR argument
3688 if (reg_num >= (TARGET_PTR_BIT == 64 ? 19 : 23) && reg_num <= 26)
3690 while (reg_num >= (TARGET_PTR_BIT == 64 ? 19 : 23) && reg_num <= 26)
3693 status = target_read_memory (pc, buf, 4);
3694 inst = extract_unsigned_integer (buf, 4);
3697 reg_num = inst_saves_gr (inst);
3703 reg_num = inst_saves_fr (inst);
3704 save_fr &= ~(1 << reg_num);
3706 status = target_read_memory (pc + 4, buf, 4);
3707 next_inst = extract_unsigned_integer (buf, 4);
3713 /* We've got to be read to handle the ldo before the fp register
3715 if ((inst & 0xfc000000) == 0x34000000
3716 && inst_saves_fr (next_inst) >= 4
3717 && inst_saves_fr (next_inst) <= (TARGET_PTR_BIT == 64 ? 11 : 7))
3719 /* So we drop into the code below in a reasonable state. */
3720 reg_num = inst_saves_fr (next_inst);
3724 /* Ugh. Also account for argument stores into the stack.
3725 This is a kludge as on the HP compiler sets this bit and it
3726 never does prologue scheduling. So once we see one, skip past
3728 if (reg_num >= 4 && reg_num <= (TARGET_PTR_BIT == 64 ? 11 : 7))
3730 while (reg_num >= 4 && reg_num <= (TARGET_PTR_BIT == 64 ? 11 : 7))
3733 status = target_read_memory (pc, buf, 4);
3734 inst = extract_unsigned_integer (buf, 4);
3737 if ((inst & 0xfc000000) != 0x34000000)
3739 status = target_read_memory (pc + 4, buf, 4);
3740 next_inst = extract_unsigned_integer (buf, 4);
3743 reg_num = inst_saves_fr (next_inst);
3749 /* Quit if we hit any kind of branch. This can happen if a prologue
3750 instruction is in the delay slot of the first call/branch. */
3751 if (is_branch (inst))
3754 /* What a crock. The HP compilers set args_stored even if no
3755 arguments were stored into the stack (boo hiss). This could
3756 cause this code to then skip a bunch of user insns (up to the
3759 To combat this we try to identify when args_stored was bogusly
3760 set and clear it. We only do this when args_stored is nonzero,
3761 all other resources are accounted for, and nothing changed on
3764 && !(save_gr || save_fr || save_rp || save_sp || stack_remaining > 0)
3765 && old_save_gr == save_gr && old_save_fr == save_fr
3766 && old_save_rp == save_rp && old_save_sp == save_sp
3767 && old_stack_remaining == stack_remaining)
3774 /* We've got a tenative location for the end of the prologue. However
3775 because of limitations in the unwind descriptor mechanism we may
3776 have went too far into user code looking for the save of a register
3777 that does not exist. So, if there registers we expected to be saved
3778 but never were, mask them out and restart.
3780 This should only happen in optimized code, and should be very rare. */
3781 if (save_gr || (save_fr && !(restart_fr || restart_gr)))
3784 restart_gr = save_gr;
3785 restart_fr = save_fr;
3793 /* Return the address of the PC after the last prologue instruction if
3794 we can determine it from the debug symbols. Else return zero. */
3797 after_prologue (CORE_ADDR pc)
3799 struct symtab_and_line sal;
3800 CORE_ADDR func_addr, func_end;
3803 /* If we can not find the symbol in the partial symbol table, then
3804 there is no hope we can determine the function's start address
3806 if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end))
3809 /* Get the line associated with FUNC_ADDR. */
3810 sal = find_pc_line (func_addr, 0);
3812 /* There are only two cases to consider. First, the end of the source line
3813 is within the function bounds. In that case we return the end of the
3814 source line. Second is the end of the source line extends beyond the
3815 bounds of the current function. We need to use the slow code to
3816 examine instructions in that case.
3818 Anything else is simply a bug elsewhere. Fixing it here is absolutely
3819 the wrong thing to do. In fact, it should be entirely possible for this
3820 function to always return zero since the slow instruction scanning code
3821 is supposed to *always* work. If it does not, then it is a bug. */
3822 if (sal.end < func_end)
3828 /* To skip prologues, I use this predicate. Returns either PC itself
3829 if the code at PC does not look like a function prologue; otherwise
3830 returns an address that (if we're lucky) follows the prologue. If
3831 LENIENT, then we must skip everything which is involved in setting
3832 up the frame (it's OK to skip more, just so long as we don't skip
3833 anything which might clobber the registers which are being saved.
3834 Currently we must not skip more on the alpha, but we might the lenient
3838 hppa_skip_prologue (CORE_ADDR pc)
3842 CORE_ADDR post_prologue_pc;
3845 /* See if we can determine the end of the prologue via the symbol table.
3846 If so, then return either PC, or the PC after the prologue, whichever
3849 post_prologue_pc = after_prologue (pc);
3851 /* If after_prologue returned a useful address, then use it. Else
3852 fall back on the instruction skipping code.
3854 Some folks have claimed this causes problems because the breakpoint
3855 may be the first instruction of the prologue. If that happens, then
3856 the instruction skipping code has a bug that needs to be fixed. */
3857 if (post_prologue_pc != 0)
3858 return max (pc, post_prologue_pc);
3860 return (skip_prologue_hard_way (pc));
3863 /* Put here the code to store, into a struct frame_saved_regs,
3864 the addresses of the saved registers of frame described by FRAME_INFO.
3865 This includes special registers such as pc and fp saved in special
3866 ways in the stack frame. sp is even more special:
3867 the address we return for it IS the sp for the next frame. */
3870 hppa_frame_find_saved_regs (struct frame_info *frame_info,
3871 struct frame_saved_regs *frame_saved_regs)
3874 struct unwind_table_entry *u;
3875 unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp;
3879 int final_iteration;
3881 /* Zero out everything. */
3882 memset (frame_saved_regs, '\0', sizeof (struct frame_saved_regs));
3884 /* Call dummy frames always look the same, so there's no need to
3885 examine the dummy code to determine locations of saved registers;
3886 instead, let find_dummy_frame_regs fill in the correct offsets
3887 for the saved registers. */
3888 if ((frame_info->pc >= frame_info->frame
3889 && frame_info->pc <= (frame_info->frame
3890 /* A call dummy is sized in words, but it is
3891 actually a series of instructions. Account
3892 for that scaling factor. */
3893 + ((REGISTER_SIZE / INSTRUCTION_SIZE)
3894 * CALL_DUMMY_LENGTH)
3895 /* Similarly we have to account for 64bit
3896 wide register saves. */
3897 + (32 * REGISTER_SIZE)
3898 /* We always consider FP regs 8 bytes long. */
3899 + (NUM_REGS - FP0_REGNUM) * 8
3900 /* Similarly we have to account for 64bit
3901 wide register saves. */
3902 + (6 * REGISTER_SIZE))))
3903 find_dummy_frame_regs (frame_info, frame_saved_regs);
3905 /* Interrupt handlers are special too. They lay out the register
3906 state in the exact same order as the register numbers in GDB. */
3907 if (pc_in_interrupt_handler (frame_info->pc))
3909 for (i = 0; i < NUM_REGS; i++)
3911 /* SP is a little special. */
3913 frame_saved_regs->regs[SP_REGNUM]
3914 = read_memory_integer (frame_info->frame + SP_REGNUM * 4,
3915 TARGET_PTR_BIT / 8);
3917 frame_saved_regs->regs[i] = frame_info->frame + i * 4;
3922 #ifdef FRAME_FIND_SAVED_REGS_IN_SIGTRAMP
3923 /* Handle signal handler callers. */
3924 if ((get_frame_type (frame_info) == SIGTRAMP_FRAME))
3926 FRAME_FIND_SAVED_REGS_IN_SIGTRAMP (frame_info, frame_saved_regs);
3931 /* Get the starting address of the function referred to by the PC
3933 pc = get_pc_function_start (frame_info->pc);
3936 u = find_unwind_entry (pc);
3940 /* This is how much of a frame adjustment we need to account for. */
3941 stack_remaining = u->Total_frame_size << 3;
3943 /* Magic register saves we want to know about. */
3944 save_rp = u->Save_RP;
3945 save_sp = u->Save_SP;
3947 /* Turn the Entry_GR field into a bitmask. */
3949 for (i = 3; i < u->Entry_GR + 3; i++)
3951 /* Frame pointer gets saved into a special location. */
3952 if (u->Save_SP && i == FP_REGNUM)
3955 save_gr |= (1 << i);
3958 /* Turn the Entry_FR field into a bitmask too. */
3960 for (i = 12; i < u->Entry_FR + 12; i++)
3961 save_fr |= (1 << i);
3963 /* The frame always represents the value of %sp at entry to the
3964 current function (and is thus equivalent to the "saved" stack
3966 frame_saved_regs->regs[SP_REGNUM] = frame_info->frame;
3968 /* Loop until we find everything of interest or hit a branch.
3970 For unoptimized GCC code and for any HP CC code this will never ever
3971 examine any user instructions.
3973 For optimized GCC code we're faced with problems. GCC will schedule
3974 its prologue and make prologue instructions available for delay slot
3975 filling. The end result is user code gets mixed in with the prologue
3976 and a prologue instruction may be in the delay slot of the first branch
3979 Some unexpected things are expected with debugging optimized code, so
3980 we allow this routine to walk past user instructions in optimized
3982 final_iteration = 0;
3983 while ((save_gr || save_fr || save_rp || save_sp || stack_remaining > 0)
3984 && pc <= frame_info->pc)
3986 status = target_read_memory (pc, buf, 4);
3987 inst = extract_unsigned_integer (buf, 4);
3993 /* Note the interesting effects of this instruction. */
3994 stack_remaining -= prologue_inst_adjust_sp (inst);
3996 /* There are limited ways to store the return pointer into the
3998 if (inst == 0x6bc23fd9) /* stw rp,-0x14(sr0,sp) */
4001 frame_saved_regs->regs[RP_REGNUM] = frame_info->frame - 20;
4003 else if (inst == 0x0fc212c1) /* std rp,-0x10(sr0,sp) */
4006 frame_saved_regs->regs[RP_REGNUM] = frame_info->frame - 16;
4009 /* Note if we saved SP into the stack. This also happens to indicate
4010 the location of the saved frame pointer. */
4011 if ( (inst & 0xffffc000) == 0x6fc10000 /* stw,ma r1,N(sr0,sp) */
4012 || (inst & 0xffffc00c) == 0x73c10008) /* std,ma r1,N(sr0,sp) */
4014 frame_saved_regs->regs[FP_REGNUM] = frame_info->frame;
4018 /* Account for general and floating-point register saves. */
4019 reg = inst_saves_gr (inst);
4020 if (reg >= 3 && reg <= 18
4021 && (!u->Save_SP || reg != FP_REGNUM))
4023 save_gr &= ~(1 << reg);
4025 /* stwm with a positive displacement is a *post modify*. */
4026 if ((inst >> 26) == 0x1b
4027 && extract_14 (inst) >= 0)
4028 frame_saved_regs->regs[reg] = frame_info->frame;
4029 /* A std has explicit post_modify forms. */
4030 else if ((inst & 0xfc00000c0) == 0x70000008)
4031 frame_saved_regs->regs[reg] = frame_info->frame;
4036 if ((inst >> 26) == 0x1c)
4037 offset = (inst & 0x1 ? -1 << 13 : 0) | (((inst >> 4) & 0x3ff) << 3);
4038 else if ((inst >> 26) == 0x03)
4039 offset = low_sign_extend (inst & 0x1f, 5);
4041 offset = extract_14 (inst);
4043 /* Handle code with and without frame pointers. */
4045 frame_saved_regs->regs[reg]
4046 = frame_info->frame + offset;
4048 frame_saved_regs->regs[reg]
4049 = (frame_info->frame + (u->Total_frame_size << 3)
4055 /* GCC handles callee saved FP regs a little differently.
4057 It emits an instruction to put the value of the start of
4058 the FP store area into %r1. It then uses fstds,ma with
4059 a basereg of %r1 for the stores.
4061 HP CC emits them at the current stack pointer modifying
4062 the stack pointer as it stores each register. */
4064 /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */
4065 if ((inst & 0xffffc000) == 0x34610000
4066 || (inst & 0xffffc000) == 0x37c10000)
4067 fp_loc = extract_14 (inst);
4069 reg = inst_saves_fr (inst);
4070 if (reg >= 12 && reg <= 21)
4072 /* Note +4 braindamage below is necessary because the FP status
4073 registers are internally 8 registers rather than the expected
4075 save_fr &= ~(1 << reg);
4078 /* 1st HP CC FP register store. After this instruction
4079 we've set enough state that the GCC and HPCC code are
4080 both handled in the same manner. */
4081 frame_saved_regs->regs[reg + FP4_REGNUM + 4] = frame_info->frame;
4086 frame_saved_regs->regs[reg + FP0_REGNUM + 4]
4087 = frame_info->frame + fp_loc;
4092 /* Quit if we hit any kind of branch the previous iteration. */
4093 if (final_iteration)
4096 /* We want to look precisely one instruction beyond the branch
4097 if we have not found everything yet. */
4098 if (is_branch (inst))
4099 final_iteration = 1;
4107 /* Exception handling support for the HP-UX ANSI C++ compiler.
4108 The compiler (aCC) provides a callback for exception events;
4109 GDB can set a breakpoint on this callback and find out what
4110 exception event has occurred. */
4112 /* The name of the hook to be set to point to the callback function */
4113 static char HP_ACC_EH_notify_hook[] = "__eh_notify_hook";
4114 /* The name of the function to be used to set the hook value */
4115 static char HP_ACC_EH_set_hook_value[] = "__eh_set_hook_value";
4116 /* The name of the callback function in end.o */
4117 static char HP_ACC_EH_notify_callback[] = "__d_eh_notify_callback";
4118 /* Name of function in end.o on which a break is set (called by above) */
4119 static char HP_ACC_EH_break[] = "__d_eh_break";
4120 /* Name of flag (in end.o) that enables catching throws */
4121 static char HP_ACC_EH_catch_throw[] = "__d_eh_catch_throw";
4122 /* Name of flag (in end.o) that enables catching catching */
4123 static char HP_ACC_EH_catch_catch[] = "__d_eh_catch_catch";
4124 /* The enum used by aCC */
4132 /* Is exception-handling support available with this executable? */
4133 static int hp_cxx_exception_support = 0;
4134 /* Has the initialize function been run? */
4135 int hp_cxx_exception_support_initialized = 0;
4136 /* Similar to above, but imported from breakpoint.c -- non-target-specific */
4137 extern int exception_support_initialized;
4138 /* Address of __eh_notify_hook */
4139 static CORE_ADDR eh_notify_hook_addr = 0;
4140 /* Address of __d_eh_notify_callback */
4141 static CORE_ADDR eh_notify_callback_addr = 0;
4142 /* Address of __d_eh_break */
4143 static CORE_ADDR eh_break_addr = 0;
4144 /* Address of __d_eh_catch_catch */
4145 static CORE_ADDR eh_catch_catch_addr = 0;
4146 /* Address of __d_eh_catch_throw */
4147 static CORE_ADDR eh_catch_throw_addr = 0;
4148 /* Sal for __d_eh_break */
4149 static struct symtab_and_line *break_callback_sal = 0;
4151 /* Code in end.c expects __d_pid to be set in the inferior,
4152 otherwise __d_eh_notify_callback doesn't bother to call
4153 __d_eh_break! So we poke the pid into this symbol
4158 setup_d_pid_in_inferior (void)
4161 struct minimal_symbol *msymbol;
4162 char buf[4]; /* FIXME 32x64? */
4164 /* Slam the pid of the process into __d_pid; failing is only a warning! */
4165 msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile);
4166 if (msymbol == NULL)
4168 warning ("Unable to find __d_pid symbol in object file.");
4169 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
4173 anaddr = SYMBOL_VALUE_ADDRESS (msymbol);
4174 store_unsigned_integer (buf, 4, PIDGET (inferior_ptid)); /* FIXME 32x64? */
4175 if (target_write_memory (anaddr, buf, 4)) /* FIXME 32x64? */
4177 warning ("Unable to write __d_pid");
4178 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
4184 /* Initialize exception catchpoint support by looking for the
4185 necessary hooks/callbacks in end.o, etc., and set the hook value to
4186 point to the required debug function
4192 initialize_hp_cxx_exception_support (void)
4194 struct symtabs_and_lines sals;
4195 struct cleanup *old_chain;
4196 struct cleanup *canonical_strings_chain = NULL;
4199 char *addr_end = NULL;
4200 char **canonical = (char **) NULL;
4202 struct symbol *sym = NULL;
4203 struct minimal_symbol *msym = NULL;
4204 struct objfile *objfile;
4205 asection *shlib_info;
4207 /* Detect and disallow recursion. On HP-UX with aCC, infinite
4208 recursion is a possibility because finding the hook for exception
4209 callbacks involves making a call in the inferior, which means
4210 re-inserting breakpoints which can re-invoke this code */
4212 static int recurse = 0;
4215 hp_cxx_exception_support_initialized = 0;
4216 exception_support_initialized = 0;
4220 hp_cxx_exception_support = 0;
4222 /* First check if we have seen any HP compiled objects; if not,
4223 it is very unlikely that HP's idiosyncratic callback mechanism
4224 for exception handling debug support will be available!
4225 This will percolate back up to breakpoint.c, where our callers
4226 will decide to try the g++ exception-handling support instead. */
4227 if (!hp_som_som_object_present)
4230 /* We have a SOM executable with SOM debug info; find the hooks */
4232 /* First look for the notify hook provided by aCC runtime libs */
4233 /* If we find this symbol, we conclude that the executable must
4234 have HP aCC exception support built in. If this symbol is not
4235 found, even though we're a HP SOM-SOM file, we may have been
4236 built with some other compiler (not aCC). This results percolates
4237 back up to our callers in breakpoint.c which can decide to
4238 try the g++ style of exception support instead.
4239 If this symbol is found but the other symbols we require are
4240 not found, there is something weird going on, and g++ support
4241 should *not* be tried as an alternative.
4243 ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined.
4244 ASSUMPTION: HP aCC and g++ modules cannot be linked together. */
4246 /* libCsup has this hook; it'll usually be non-debuggable */
4247 msym = lookup_minimal_symbol (HP_ACC_EH_notify_hook, NULL, NULL);
4250 eh_notify_hook_addr = SYMBOL_VALUE_ADDRESS (msym);
4251 hp_cxx_exception_support = 1;
4255 warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook);
4256 warning ("Executable may not have been compiled debuggable with HP aCC.");
4257 warning ("GDB will be unable to intercept exception events.");
4258 eh_notify_hook_addr = 0;
4259 hp_cxx_exception_support = 0;
4263 /* Next look for the notify callback routine in end.o */
4264 /* This is always available in the SOM symbol dictionary if end.o is linked in */
4265 msym = lookup_minimal_symbol (HP_ACC_EH_notify_callback, NULL, NULL);
4268 eh_notify_callback_addr = SYMBOL_VALUE_ADDRESS (msym);
4269 hp_cxx_exception_support = 1;
4273 warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback);
4274 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
4275 warning ("GDB will be unable to intercept exception events.");
4276 eh_notify_callback_addr = 0;
4280 #ifndef GDB_TARGET_IS_HPPA_20W
4281 /* Check whether the executable is dynamically linked or archive bound */
4282 /* With an archive-bound executable we can use the raw addresses we find
4283 for the callback function, etc. without modification. For an executable
4284 with shared libraries, we have to do more work to find the plabel, which
4285 can be the target of a call through $$dyncall from the aCC runtime support
4286 library (libCsup) which is linked shared by default by aCC. */
4287 /* This test below was copied from somsolib.c/somread.c. It may not be a very
4288 reliable one to test that an executable is linked shared. pai/1997-07-18 */
4289 shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$");
4290 if (shlib_info && (bfd_section_size (symfile_objfile->obfd, shlib_info) != 0))
4292 /* The minsym we have has the local code address, but that's not the
4293 plabel that can be used by an inter-load-module call. */
4294 /* Find solib handle for main image (which has end.o), and use that
4295 and the min sym as arguments to __d_shl_get() (which does the equivalent
4296 of shl_findsym()) to find the plabel. */
4298 args_for_find_stub args;
4299 static char message[] = "Error while finding exception callback hook:\n";
4301 args.solib_handle = som_solib_get_solib_by_pc (eh_notify_callback_addr);
4303 args.return_val = 0;
4306 catch_errors (cover_find_stub_with_shl_get, (PTR) &args, message,
4308 eh_notify_callback_addr = args.return_val;
4311 exception_catchpoints_are_fragile = 1;
4313 if (!eh_notify_callback_addr)
4315 /* We can get here either if there is no plabel in the export list
4316 for the main image, or if something strange happened (?) */
4317 warning ("Couldn't find a plabel (indirect function label) for the exception callback.");
4318 warning ("GDB will not be able to intercept exception events.");
4323 exception_catchpoints_are_fragile = 0;
4326 /* Now, look for the breakpointable routine in end.o */
4327 /* This should also be available in the SOM symbol dict. if end.o linked in */
4328 msym = lookup_minimal_symbol (HP_ACC_EH_break, NULL, NULL);
4331 eh_break_addr = SYMBOL_VALUE_ADDRESS (msym);
4332 hp_cxx_exception_support = 1;
4336 warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break);
4337 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
4338 warning ("GDB will be unable to intercept exception events.");
4343 /* Next look for the catch enable flag provided in end.o */
4344 sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL,
4345 VAR_NAMESPACE, 0, (struct symtab **) NULL);
4346 if (sym) /* sometimes present in debug info */
4348 eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (sym);
4349 hp_cxx_exception_support = 1;
4352 /* otherwise look in SOM symbol dict. */
4354 msym = lookup_minimal_symbol (HP_ACC_EH_catch_catch, NULL, NULL);
4357 eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (msym);
4358 hp_cxx_exception_support = 1;
4362 warning ("Unable to enable interception of exception catches.");
4363 warning ("Executable may not have been compiled debuggable with HP aCC.");
4364 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
4369 /* Next look for the catch enable flag provided end.o */
4370 sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL,
4371 VAR_NAMESPACE, 0, (struct symtab **) NULL);
4372 if (sym) /* sometimes present in debug info */
4374 eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (sym);
4375 hp_cxx_exception_support = 1;
4378 /* otherwise look in SOM symbol dict. */
4380 msym = lookup_minimal_symbol (HP_ACC_EH_catch_throw, NULL, NULL);
4383 eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (msym);
4384 hp_cxx_exception_support = 1;
4388 warning ("Unable to enable interception of exception throws.");
4389 warning ("Executable may not have been compiled debuggable with HP aCC.");
4390 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
4396 hp_cxx_exception_support = 2; /* everything worked so far */
4397 hp_cxx_exception_support_initialized = 1;
4398 exception_support_initialized = 1;
4403 /* Target operation for enabling or disabling interception of
4405 KIND is either EX_EVENT_THROW or EX_EVENT_CATCH
4406 ENABLE is either 0 (disable) or 1 (enable).
4407 Return value is NULL if no support found;
4408 -1 if something went wrong,
4409 or a pointer to a symtab/line struct if the breakpointable
4410 address was found. */
4412 struct symtab_and_line *
4413 child_enable_exception_callback (enum exception_event_kind kind, int enable)
4417 if (!exception_support_initialized || !hp_cxx_exception_support_initialized)
4418 if (!initialize_hp_cxx_exception_support ())
4421 switch (hp_cxx_exception_support)
4424 /* Assuming no HP support at all */
4427 /* HP support should be present, but something went wrong */
4428 return (struct symtab_and_line *) -1; /* yuck! */
4429 /* there may be other cases in the future */
4432 /* Set the EH hook to point to the callback routine */
4433 store_unsigned_integer (buf, 4, enable ? eh_notify_callback_addr : 0); /* FIXME 32x64 problem */
4434 /* pai: (temp) FIXME should there be a pack operation first? */
4435 if (target_write_memory (eh_notify_hook_addr, buf, 4)) /* FIXME 32x64 problem */
4437 warning ("Could not write to target memory for exception event callback.");
4438 warning ("Interception of exception events may not work.");
4439 return (struct symtab_and_line *) -1;
4443 /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */
4444 if (PIDGET (inferior_ptid) > 0)
4446 if (setup_d_pid_in_inferior ())
4447 return (struct symtab_and_line *) -1;
4451 warning ("Internal error: Invalid inferior pid? Cannot intercept exception events.");
4452 return (struct symtab_and_line *) -1;
4458 case EX_EVENT_THROW:
4459 store_unsigned_integer (buf, 4, enable ? 1 : 0);
4460 if (target_write_memory (eh_catch_throw_addr, buf, 4)) /* FIXME 32x64? */
4462 warning ("Couldn't enable exception throw interception.");
4463 return (struct symtab_and_line *) -1;
4466 case EX_EVENT_CATCH:
4467 store_unsigned_integer (buf, 4, enable ? 1 : 0);
4468 if (target_write_memory (eh_catch_catch_addr, buf, 4)) /* FIXME 32x64? */
4470 warning ("Couldn't enable exception catch interception.");
4471 return (struct symtab_and_line *) -1;
4475 error ("Request to enable unknown or unsupported exception event.");
4478 /* Copy break address into new sal struct, malloc'ing if needed. */
4479 if (!break_callback_sal)
4481 break_callback_sal = (struct symtab_and_line *) xmalloc (sizeof (struct symtab_and_line));
4483 init_sal (break_callback_sal);
4484 break_callback_sal->symtab = NULL;
4485 break_callback_sal->pc = eh_break_addr;
4486 break_callback_sal->line = 0;
4487 break_callback_sal->end = eh_break_addr;
4489 return break_callback_sal;
4492 /* Record some information about the current exception event */
4493 static struct exception_event_record current_ex_event;
4494 /* Convenience struct */
4495 static struct symtab_and_line null_symtab_and_line =
4498 /* Report current exception event. Returns a pointer to a record
4499 that describes the kind of the event, where it was thrown from,
4500 and where it will be caught. More information may be reported
4502 struct exception_event_record *
4503 child_get_current_exception_event (void)
4505 CORE_ADDR event_kind;
4506 CORE_ADDR throw_addr;
4507 CORE_ADDR catch_addr;
4508 struct frame_info *fi, *curr_frame;
4511 curr_frame = get_current_frame ();
4513 return (struct exception_event_record *) NULL;
4515 /* Go up one frame to __d_eh_notify_callback, because at the
4516 point when this code is executed, there's garbage in the
4517 arguments of __d_eh_break. */
4518 fi = find_relative_frame (curr_frame, &level);
4520 return (struct exception_event_record *) NULL;
4524 /* Read in the arguments */
4525 /* __d_eh_notify_callback() is called with 3 arguments:
4526 1. event kind catch or throw
4527 2. the target address if known
4528 3. a flag -- not sure what this is. pai/1997-07-17 */
4529 event_kind = read_register (ARG0_REGNUM);
4530 catch_addr = read_register (ARG1_REGNUM);
4532 /* Now go down to a user frame */
4533 /* For a throw, __d_eh_break is called by
4534 __d_eh_notify_callback which is called by
4535 __notify_throw which is called
4537 For a catch, __d_eh_break is called by
4538 __d_eh_notify_callback which is called by
4539 <stackwalking stuff> which is called by
4540 __throw__<stuff> or __rethrow_<stuff> which is called
4542 /* FIXME: Don't use such magic numbers; search for the frames */
4543 level = (event_kind == EX_EVENT_THROW) ? 3 : 4;
4544 fi = find_relative_frame (curr_frame, &level);
4546 return (struct exception_event_record *) NULL;
4549 throw_addr = fi->pc;
4551 /* Go back to original (top) frame */
4552 select_frame (curr_frame);
4554 current_ex_event.kind = (enum exception_event_kind) event_kind;
4555 current_ex_event.throw_sal = find_pc_line (throw_addr, 1);
4556 current_ex_event.catch_sal = find_pc_line (catch_addr, 1);
4558 return ¤t_ex_event;
4562 unwind_command (char *exp, int from_tty)
4565 struct unwind_table_entry *u;
4567 /* If we have an expression, evaluate it and use it as the address. */
4569 if (exp != 0 && *exp != 0)
4570 address = parse_and_eval_address (exp);
4574 u = find_unwind_entry (address);
4578 printf_unfiltered ("Can't find unwind table entry for %s\n", exp);
4582 printf_unfiltered ("unwind_table_entry (0x%s):\n",
4583 paddr_nz (host_pointer_to_address (u)));
4585 printf_unfiltered ("\tregion_start = ");
4586 print_address (u->region_start, gdb_stdout);
4588 printf_unfiltered ("\n\tregion_end = ");
4589 print_address (u->region_end, gdb_stdout);
4591 #define pif(FLD) if (u->FLD) printf_unfiltered (" "#FLD);
4593 printf_unfiltered ("\n\tflags =");
4594 pif (Cannot_unwind);
4596 pif (Millicode_save_sr0);
4599 pif (Variable_Frame);
4600 pif (Separate_Package_Body);
4601 pif (Frame_Extension_Millicode);
4602 pif (Stack_Overflow_Check);
4603 pif (Two_Instruction_SP_Increment);
4607 pif (Save_MRP_in_frame);
4608 pif (extn_ptr_defined);
4609 pif (Cleanup_defined);
4610 pif (MPE_XL_interrupt_marker);
4611 pif (HP_UX_interrupt_marker);
4614 putchar_unfiltered ('\n');
4616 #define pin(FLD) printf_unfiltered ("\t"#FLD" = 0x%x\n", u->FLD);
4618 pin (Region_description);
4621 pin (Total_frame_size);
4624 #ifdef PREPARE_TO_PROCEED
4626 /* If the user has switched threads, and there is a breakpoint
4627 at the old thread's pc location, then switch to that thread
4628 and return TRUE, else return FALSE and don't do a thread
4629 switch (or rather, don't seem to have done a thread switch).
4631 Ptrace-based gdb will always return FALSE to the thread-switch
4632 query, and thus also to PREPARE_TO_PROCEED.
4634 The important thing is whether there is a BPT instruction,
4635 not how many user breakpoints there are. So we have to worry
4636 about things like these:
4640 o User hits bp, no switch -- NO
4642 o User hits bp, switches threads -- YES
4644 o User hits bp, deletes bp, switches threads -- NO
4646 o User hits bp, deletes one of two or more bps
4647 at that PC, user switches threads -- YES
4649 o Plus, since we're buffering events, the user may have hit a
4650 breakpoint, deleted the breakpoint and then gotten another
4651 hit on that same breakpoint on another thread which
4652 actually hit before the delete. (FIXME in breakpoint.c
4653 so that "dead" breakpoints are ignored?) -- NO
4655 For these reasons, we have to violate information hiding and
4656 call "breakpoint_here_p". If core gdb thinks there is a bpt
4657 here, that's what counts, as core gdb is the one which is
4658 putting the BPT instruction in and taking it out.
4660 Note that this implementation is potentially redundant now that
4661 default_prepare_to_proceed() has been added.
4663 FIXME This may not support switching threads after Ctrl-C
4664 correctly. The default implementation does support this. */
4666 hppa_prepare_to_proceed (void)
4669 pid_t current_thread;
4671 old_thread = hppa_switched_threads (PIDGET (inferior_ptid));
4672 if (old_thread != 0)
4674 /* Switched over from "old_thread". Try to do
4675 as little work as possible, 'cause mostly
4676 we're going to switch back. */
4678 CORE_ADDR old_pc = read_pc ();
4680 /* Yuk, shouldn't use global to specify current
4681 thread. But that's how gdb does it. */
4682 current_thread = PIDGET (inferior_ptid);
4683 inferior_ptid = pid_to_ptid (old_thread);
4685 new_pc = read_pc ();
4686 if (new_pc != old_pc /* If at same pc, no need */
4687 && breakpoint_here_p (new_pc))
4689 /* User hasn't deleted the BP.
4690 Return TRUE, finishing switch to "old_thread". */
4691 flush_cached_frames ();
4692 registers_changed ();
4694 printf ("---> PREPARE_TO_PROCEED (was %d, now %d)!\n",
4695 current_thread, PIDGET (inferior_ptid));
4701 /* Otherwise switch back to the user-chosen thread. */
4702 inferior_ptid = pid_to_ptid (current_thread);
4703 new_pc = read_pc (); /* Re-prime register cache */
4708 #endif /* PREPARE_TO_PROCEED */
4711 hppa_skip_permanent_breakpoint (void)
4713 /* To step over a breakpoint instruction on the PA takes some
4714 fiddling with the instruction address queue.
4716 When we stop at a breakpoint, the IA queue front (the instruction
4717 we're executing now) points at the breakpoint instruction, and
4718 the IA queue back (the next instruction to execute) points to
4719 whatever instruction we would execute after the breakpoint, if it
4720 were an ordinary instruction. This is the case even if the
4721 breakpoint is in the delay slot of a branch instruction.
4723 Clearly, to step past the breakpoint, we need to set the queue
4724 front to the back. But what do we put in the back? What
4725 instruction comes after that one? Because of the branch delay
4726 slot, the next insn is always at the back + 4. */
4727 write_register (PCOQ_HEAD_REGNUM, read_register (PCOQ_TAIL_REGNUM));
4728 write_register (PCSQ_HEAD_REGNUM, read_register (PCSQ_TAIL_REGNUM));
4730 write_register (PCOQ_TAIL_REGNUM, read_register (PCOQ_TAIL_REGNUM) + 4);
4731 /* We can leave the tail's space the same, since there's no jump. */
4734 /* Copy the function value from VALBUF into the proper location
4735 for a function return.
4737 Called only in the context of the "return" command. */
4740 hppa_store_return_value (struct type *type, char *valbuf)
4742 /* For software floating point, the return value goes into the
4743 integer registers. But we do not have any flag to key this on,
4744 so we always store the value into the integer registers.
4746 If its a float value, then we also store it into the floating
4748 deprecated_write_register_bytes (REGISTER_BYTE (28)
4749 + (TYPE_LENGTH (type) > 4
4750 ? (8 - TYPE_LENGTH (type))
4751 : (4 - TYPE_LENGTH (type))),
4752 valbuf, TYPE_LENGTH (type));
4753 if (! SOFT_FLOAT && TYPE_CODE (type) == TYPE_CODE_FLT)
4754 deprecated_write_register_bytes (REGISTER_BYTE (FP4_REGNUM),
4755 valbuf, TYPE_LENGTH (type));
4758 /* Copy the function's return value into VALBUF.
4760 This function is called only in the context of "target function calls",
4761 ie. when the debugger forces a function to be called in the child, and
4762 when the debugger forces a fucntion to return prematurely via the
4763 "return" command. */
4766 hppa_extract_return_value (struct type *type, char *regbuf, char *valbuf)
4768 if (! SOFT_FLOAT && TYPE_CODE (type) == TYPE_CODE_FLT)
4770 (char *)regbuf + REGISTER_BYTE (FP4_REGNUM),
4771 TYPE_LENGTH (type));
4775 + REGISTER_BYTE (28)
4776 + (TYPE_LENGTH (type) > 4
4777 ? (8 - TYPE_LENGTH (type))
4778 : (4 - TYPE_LENGTH (type)))),
4779 TYPE_LENGTH (type));
4783 hppa_reg_struct_has_addr (int gcc_p, struct type *type)
4785 /* On the PA, any pass-by-value structure > 8 bytes is actually passed
4786 via a pointer regardless of its type or the compiler used. */
4787 return (TYPE_LENGTH (type) > 8);
4791 hppa_inner_than (CORE_ADDR lhs, CORE_ADDR rhs)
4793 /* Stack grows upward */
4798 hppa_stack_align (CORE_ADDR sp)
4800 /* elz: adjust the quantity to the next highest value which is
4801 64-bit aligned. This is used in valops.c, when the sp is adjusted.
4802 On hppa the sp must always be kept 64-bit aligned */
4803 return ((sp % 8) ? (sp + 7) & -8 : sp);
4807 hppa_pc_requires_run_before_use (CORE_ADDR pc)
4809 /* Sometimes we may pluck out a minimal symbol that has a negative address.
4811 An example of this occurs when an a.out is linked against a foo.sl.
4812 The foo.sl defines a global bar(), and the a.out declares a signature
4813 for bar(). However, the a.out doesn't directly call bar(), but passes
4814 its address in another call.
4816 If you have this scenario and attempt to "break bar" before running,
4817 gdb will find a minimal symbol for bar() in the a.out. But that
4818 symbol's address will be negative. What this appears to denote is
4819 an index backwards from the base of the procedure linkage table (PLT)
4820 into the data linkage table (DLT), the end of which is contiguous
4821 with the start of the PLT. This is clearly not a valid address for
4822 us to set a breakpoint on.
4824 Note that one must be careful in how one checks for a negative address.
4825 0xc0000000 is a legitimate address of something in a shared text
4826 segment, for example. Since I don't know what the possible range
4827 is of these "really, truly negative" addresses that come from the
4828 minimal symbols, I'm resorting to the gross hack of checking the
4829 top byte of the address for all 1's. Sigh. */
4831 return (!target_has_stack && (pc & 0xFF000000));
4835 hppa_instruction_nullified (void)
4837 /* brobecker 2002/11/07: Couldn't we use a ULONGEST here? It would
4838 avoid the type cast. I'm leaving it as is for now as I'm doing
4839 semi-mechanical multiarching-related changes. */
4840 const int ipsw = (int) read_register (IPSW_REGNUM);
4841 const int flags = (int) read_register (FLAGS_REGNUM);
4843 return ((ipsw & 0x00200000) && !(flags & 0x2));
4847 hppa_register_raw_size (int reg_nr)
4849 /* All registers have the same size. */
4850 return REGISTER_SIZE;
4853 /* Index within the register vector of the first byte of the space i
4854 used for register REG_NR. */
4857 hppa_register_byte (int reg_nr)
4862 /* Return the GDB type object for the "standard" data type of data
4866 hppa_register_virtual_type (int reg_nr)
4868 if (reg_nr < FP4_REGNUM)
4869 return builtin_type_int;
4871 return builtin_type_float;
4874 /* Store the address of the place in which to copy the structure the
4875 subroutine will return. This is called from call_function. */
4878 hppa_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
4880 write_register (28, addr);
4884 hppa_extract_struct_value_address (char *regbuf)
4886 /* Extract from an array REGBUF containing the (raw) register state
4887 the address in which a function should return its structure value,
4888 as a CORE_ADDR (or an expression that can be used as one). */
4889 /* FIXME: brobecker 2002-12-26.
4890 The current implementation is historical, but we should eventually
4891 implement it in a more robust manner as it relies on the fact that
4892 the address size is equal to the size of an int* _on the host_...
4893 One possible implementation that crossed my mind is to use
4895 return (*(int *)(regbuf + REGISTER_BYTE (28)));
4898 /* Return True if REGNUM is not a register available to the user
4899 through ptrace(). */
4902 hppa_cannot_store_register (int regnum)
4905 || regnum == PCSQ_HEAD_REGNUM
4906 || (regnum >= PCSQ_TAIL_REGNUM && regnum < IPSW_REGNUM)
4907 || (regnum > IPSW_REGNUM && regnum < FP4_REGNUM));
4912 hppa_frame_args_address (struct frame_info *fi)
4918 hppa_frame_locals_address (struct frame_info *fi)
4924 hppa_frame_num_args (struct frame_info *frame)
4926 /* We can't tell how many args there are now that the C compiler delays
4932 hppa_smash_text_address (CORE_ADDR addr)
4934 /* The low two bits of the PC on the PA contain the privilege level.
4935 Some genius implementing a (non-GCC) compiler apparently decided
4936 this means that "addresses" in a text section therefore include a
4937 privilege level, and thus symbol tables should contain these bits.
4938 This seems like a bonehead thing to do--anyway, it seems to work
4939 for our purposes to just ignore those bits. */
4941 return (addr &= ~0x3);
4944 static struct gdbarch *
4945 hppa_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
4947 struct gdbarch *gdbarch;
4948 enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
4950 /* Try to determine the ABI of the object we are loading. */
4952 if (info.abfd != NULL)
4954 osabi = gdbarch_lookup_osabi (info.abfd);
4955 if (osabi == GDB_OSABI_UNKNOWN)
4957 /* If it's a SOM file, assume it's HP/UX SOM. */
4958 if (bfd_get_flavour (info.abfd) == bfd_target_som_flavour)
4959 osabi = GDB_OSABI_HPUX_SOM;
4963 /* find a candidate among the list of pre-declared architectures. */
4964 arches = gdbarch_list_lookup_by_info (arches, &info);
4966 return (arches->gdbarch);
4968 /* If none found, then allocate and initialize one. */
4969 gdbarch = gdbarch_alloc (&info, NULL);
4971 /* Hook in ABI-specific overrides, if they have been registered. */
4972 gdbarch_init_osabi (info, gdbarch, osabi);
4974 set_gdbarch_reg_struct_has_addr (gdbarch, hppa_reg_struct_has_addr);
4975 set_gdbarch_function_start_offset (gdbarch, 0);
4976 set_gdbarch_skip_prologue (gdbarch, hppa_skip_prologue);
4977 set_gdbarch_skip_trampoline_code (gdbarch, hppa_skip_trampoline_code);
4978 set_gdbarch_in_solib_call_trampoline (gdbarch, hppa_in_solib_call_trampoline);
4979 set_gdbarch_in_solib_return_trampoline (gdbarch,
4980 hppa_in_solib_return_trampoline);
4981 set_gdbarch_saved_pc_after_call (gdbarch, hppa_saved_pc_after_call);
4982 set_gdbarch_inner_than (gdbarch, hppa_inner_than);
4983 set_gdbarch_stack_align (gdbarch, hppa_stack_align);
4984 set_gdbarch_extra_stack_alignment_needed (gdbarch, 0);
4985 set_gdbarch_decr_pc_after_break (gdbarch, 0);
4986 set_gdbarch_register_size (gdbarch, 4);
4987 set_gdbarch_num_regs (gdbarch, hppa_num_regs);
4988 set_gdbarch_fp_regnum (gdbarch, 3);
4989 set_gdbarch_sp_regnum (gdbarch, 30);
4990 set_gdbarch_fp0_regnum (gdbarch, 64);
4991 set_gdbarch_pc_regnum (gdbarch, PCOQ_HEAD_REGNUM);
4992 set_gdbarch_npc_regnum (gdbarch, PCOQ_TAIL_REGNUM);
4993 set_gdbarch_register_raw_size (gdbarch, hppa_register_raw_size);
4994 set_gdbarch_register_bytes (gdbarch, hppa_num_regs * 4);
4995 set_gdbarch_register_byte (gdbarch, hppa_register_byte);
4996 set_gdbarch_register_virtual_size (gdbarch, hppa_register_raw_size);
4997 set_gdbarch_max_register_raw_size (gdbarch, 4);
4998 set_gdbarch_max_register_virtual_size (gdbarch, 8);
4999 set_gdbarch_register_virtual_type (gdbarch, hppa_register_virtual_type);
5000 set_gdbarch_store_struct_return (gdbarch, hppa_store_struct_return);
5001 set_gdbarch_deprecated_extract_return_value (gdbarch,
5002 hppa_extract_return_value);
5003 set_gdbarch_use_struct_convention (gdbarch, hppa_use_struct_convention);
5004 set_gdbarch_deprecated_store_return_value (gdbarch, hppa_store_return_value);
5005 set_gdbarch_deprecated_extract_struct_value_address
5006 (gdbarch, hppa_extract_struct_value_address);
5007 set_gdbarch_cannot_store_register (gdbarch, hppa_cannot_store_register);
5008 set_gdbarch_init_extra_frame_info (gdbarch, hppa_init_extra_frame_info);
5009 set_gdbarch_frame_chain (gdbarch, hppa_frame_chain);
5010 set_gdbarch_frame_chain_valid (gdbarch, hppa_frame_chain_valid);
5011 set_gdbarch_frameless_function_invocation
5012 (gdbarch, hppa_frameless_function_invocation);
5013 set_gdbarch_frame_saved_pc (gdbarch, hppa_frame_saved_pc);
5014 set_gdbarch_frame_args_address (gdbarch, hppa_frame_args_address);
5015 set_gdbarch_frame_locals_address (gdbarch, hppa_frame_locals_address);
5016 set_gdbarch_frame_num_args (gdbarch, hppa_frame_num_args);
5017 set_gdbarch_frame_args_skip (gdbarch, 0);
5018 /* set_gdbarch_push_dummy_frame (gdbarch, hppa_push_dummy_frame); */
5019 set_gdbarch_pop_frame (gdbarch, hppa_pop_frame);
5020 set_gdbarch_call_dummy_length (gdbarch, INSTRUCTION_SIZE * 28);
5021 set_gdbarch_call_dummy_start_offset (gdbarch, 0);
5022 /* set_gdbarch_fix_call_dummy (gdbarch, hppa_fix_call_dummy); */
5023 set_gdbarch_push_arguments (gdbarch, hppa_push_arguments);
5024 set_gdbarch_smash_text_address (gdbarch, hppa_smash_text_address);
5025 set_gdbarch_believe_pcc_promotion (gdbarch, 1);
5026 set_gdbarch_read_pc (gdbarch, hppa_target_read_pc);
5027 set_gdbarch_write_pc (gdbarch, hppa_target_write_pc);
5028 set_gdbarch_read_fp (gdbarch, hppa_target_read_fp);
5034 hppa_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
5036 /* Nothing to print for the moment. */
5040 _initialize_hppa_tdep (void)
5042 struct cmd_list_element *c;
5043 void break_at_finish_command (char *arg, int from_tty);
5044 void tbreak_at_finish_command (char *arg, int from_tty);
5045 void break_at_finish_at_depth_command (char *arg, int from_tty);
5047 gdbarch_register (bfd_arch_hppa, hppa_gdbarch_init, hppa_dump_tdep);
5048 tm_print_insn = print_insn_hppa;
5050 add_cmd ("unwind", class_maintenance, unwind_command,
5051 "Print unwind table entry at given address.",
5052 &maintenanceprintlist);
5054 deprecate_cmd (add_com ("xbreak", class_breakpoint,
5055 break_at_finish_command,
5056 concat ("Set breakpoint at procedure exit. \n\
5057 Argument may be function name, or \"*\" and an address.\n\
5058 If function is specified, break at end of code for that function.\n\
5059 If an address is specified, break at the end of the function that contains \n\
5060 that exact address.\n",
5061 "With no arg, uses current execution address of selected stack frame.\n\
5062 This is useful for breaking on return to a stack frame.\n\
5064 Multiple breakpoints at one place are permitted, and useful if conditional.\n\
5066 Do \"help breakpoints\" for info on other commands dealing with breakpoints.", NULL)), NULL);
5067 deprecate_cmd (add_com_alias ("xb", "xbreak", class_breakpoint, 1), NULL);
5068 deprecate_cmd (add_com_alias ("xbr", "xbreak", class_breakpoint, 1), NULL);
5069 deprecate_cmd (add_com_alias ("xbre", "xbreak", class_breakpoint, 1), NULL);
5070 deprecate_cmd (add_com_alias ("xbrea", "xbreak", class_breakpoint, 1), NULL);
5072 deprecate_cmd (c = add_com ("txbreak", class_breakpoint,
5073 tbreak_at_finish_command,
5074 "Set temporary breakpoint at procedure exit. Either there should\n\
5075 be no argument or the argument must be a depth.\n"), NULL);
5076 set_cmd_completer (c, location_completer);
5079 deprecate_cmd (add_com ("bx", class_breakpoint,
5080 break_at_finish_at_depth_command,
5081 "Set breakpoint at procedure exit. Either there should\n\
5082 be no argument or the argument must be a depth.\n"), NULL);