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 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);
178 int hppa_coerce_float_to_double (struct type *formal, struct type *actual);
182 struct minimal_symbol *msym;
183 CORE_ADDR solib_handle;
184 CORE_ADDR return_val;
188 static int cover_find_stub_with_shl_get (PTR);
190 static int is_pa_2 = 0; /* False */
192 /* This is declared in symtab.c; set to 1 in hp-symtab-read.c */
193 extern int hp_som_som_object_present;
195 /* In breakpoint.c */
196 extern int exception_catchpoints_are_fragile;
198 /* Should call_function allocate stack space for a struct return? */
201 hppa_use_struct_convention (int gcc_p, struct type *type)
203 return (TYPE_LENGTH (type) > 2 * REGISTER_SIZE);
207 /* Routines to extract various sized constants out of hppa
210 /* This assumes that no garbage lies outside of the lower bits of
214 sign_extend (unsigned val, unsigned bits)
216 return (int) (val >> (bits - 1) ? (-1 << bits) | val : val);
219 /* For many immediate values the sign bit is the low bit! */
222 low_sign_extend (unsigned val, unsigned bits)
224 return (int) ((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1);
227 /* extract the immediate field from a ld{bhw}s instruction */
230 extract_5_load (unsigned word)
232 return low_sign_extend (word >> 16 & MASK_5, 5);
235 /* extract the immediate field from a break instruction */
238 extract_5r_store (unsigned word)
240 return (word & MASK_5);
243 /* extract the immediate field from a {sr}sm instruction */
246 extract_5R_store (unsigned word)
248 return (word >> 16 & MASK_5);
251 /* extract a 14 bit immediate field */
254 extract_14 (unsigned word)
256 return low_sign_extend (word & MASK_14, 14);
259 /* deposit a 14 bit constant in a word */
262 deposit_14 (int opnd, unsigned word)
264 unsigned sign = (opnd < 0 ? 1 : 0);
266 return word | ((unsigned) opnd << 1 & MASK_14) | sign;
269 /* extract a 21 bit constant */
272 extract_21 (unsigned word)
278 val = GET_FIELD (word, 20, 20);
280 val |= GET_FIELD (word, 9, 19);
282 val |= GET_FIELD (word, 5, 6);
284 val |= GET_FIELD (word, 0, 4);
286 val |= GET_FIELD (word, 7, 8);
287 return sign_extend (val, 21) << 11;
290 /* deposit a 21 bit constant in a word. Although 21 bit constants are
291 usually the top 21 bits of a 32 bit constant, we assume that only
292 the low 21 bits of opnd are relevant */
295 deposit_21 (unsigned opnd, unsigned word)
299 val |= GET_FIELD (opnd, 11 + 14, 11 + 18);
301 val |= GET_FIELD (opnd, 11 + 12, 11 + 13);
303 val |= GET_FIELD (opnd, 11 + 19, 11 + 20);
305 val |= GET_FIELD (opnd, 11 + 1, 11 + 11);
307 val |= GET_FIELD (opnd, 11 + 0, 11 + 0);
311 /* extract a 17 bit constant from branch instructions, returning the
312 19 bit signed value. */
315 extract_17 (unsigned word)
317 return sign_extend (GET_FIELD (word, 19, 28) |
318 GET_FIELD (word, 29, 29) << 10 |
319 GET_FIELD (word, 11, 15) << 11 |
320 (word & 0x1) << 16, 17) << 2;
324 /* Compare the start address for two unwind entries returning 1 if
325 the first address is larger than the second, -1 if the second is
326 larger than the first, and zero if they are equal. */
329 compare_unwind_entries (const void *arg1, const void *arg2)
331 const struct unwind_table_entry *a = arg1;
332 const struct unwind_table_entry *b = arg2;
334 if (a->region_start > b->region_start)
336 else if (a->region_start < b->region_start)
342 static CORE_ADDR low_text_segment_address;
345 record_text_segment_lowaddr (bfd *abfd, asection *section, void *ignored)
347 if (((section->flags & (SEC_ALLOC | SEC_LOAD | SEC_READONLY))
348 == (SEC_ALLOC | SEC_LOAD | SEC_READONLY))
349 && section->vma < low_text_segment_address)
350 low_text_segment_address = section->vma;
354 internalize_unwinds (struct objfile *objfile, struct unwind_table_entry *table,
355 asection *section, unsigned int entries, unsigned int size,
356 CORE_ADDR text_offset)
358 /* We will read the unwind entries into temporary memory, then
359 fill in the actual unwind table. */
364 char *buf = alloca (size);
366 low_text_segment_address = -1;
368 /* If addresses are 64 bits wide, then unwinds are supposed to
369 be segment relative offsets instead of absolute addresses.
371 Note that when loading a shared library (text_offset != 0) the
372 unwinds are already relative to the text_offset that will be
374 if (TARGET_PTR_BIT == 64 && text_offset == 0)
376 bfd_map_over_sections (objfile->obfd,
377 record_text_segment_lowaddr, (PTR) NULL);
379 /* ?!? Mask off some low bits. Should this instead subtract
380 out the lowest section's filepos or something like that?
381 This looks very hokey to me. */
382 low_text_segment_address &= ~0xfff;
383 text_offset += low_text_segment_address;
386 bfd_get_section_contents (objfile->obfd, section, buf, 0, size);
388 /* Now internalize the information being careful to handle host/target
390 for (i = 0; i < entries; i++)
392 table[i].region_start = bfd_get_32 (objfile->obfd,
394 table[i].region_start += text_offset;
396 table[i].region_end = bfd_get_32 (objfile->obfd, (bfd_byte *) buf);
397 table[i].region_end += text_offset;
399 tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf);
401 table[i].Cannot_unwind = (tmp >> 31) & 0x1;
402 table[i].Millicode = (tmp >> 30) & 0x1;
403 table[i].Millicode_save_sr0 = (tmp >> 29) & 0x1;
404 table[i].Region_description = (tmp >> 27) & 0x3;
405 table[i].reserved1 = (tmp >> 26) & 0x1;
406 table[i].Entry_SR = (tmp >> 25) & 0x1;
407 table[i].Entry_FR = (tmp >> 21) & 0xf;
408 table[i].Entry_GR = (tmp >> 16) & 0x1f;
409 table[i].Args_stored = (tmp >> 15) & 0x1;
410 table[i].Variable_Frame = (tmp >> 14) & 0x1;
411 table[i].Separate_Package_Body = (tmp >> 13) & 0x1;
412 table[i].Frame_Extension_Millicode = (tmp >> 12) & 0x1;
413 table[i].Stack_Overflow_Check = (tmp >> 11) & 0x1;
414 table[i].Two_Instruction_SP_Increment = (tmp >> 10) & 0x1;
415 table[i].Ada_Region = (tmp >> 9) & 0x1;
416 table[i].cxx_info = (tmp >> 8) & 0x1;
417 table[i].cxx_try_catch = (tmp >> 7) & 0x1;
418 table[i].sched_entry_seq = (tmp >> 6) & 0x1;
419 table[i].reserved2 = (tmp >> 5) & 0x1;
420 table[i].Save_SP = (tmp >> 4) & 0x1;
421 table[i].Save_RP = (tmp >> 3) & 0x1;
422 table[i].Save_MRP_in_frame = (tmp >> 2) & 0x1;
423 table[i].extn_ptr_defined = (tmp >> 1) & 0x1;
424 table[i].Cleanup_defined = tmp & 0x1;
425 tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf);
427 table[i].MPE_XL_interrupt_marker = (tmp >> 31) & 0x1;
428 table[i].HP_UX_interrupt_marker = (tmp >> 30) & 0x1;
429 table[i].Large_frame = (tmp >> 29) & 0x1;
430 table[i].Pseudo_SP_Set = (tmp >> 28) & 0x1;
431 table[i].reserved4 = (tmp >> 27) & 0x1;
432 table[i].Total_frame_size = tmp & 0x7ffffff;
434 /* Stub unwinds are handled elsewhere. */
435 table[i].stub_unwind.stub_type = 0;
436 table[i].stub_unwind.padding = 0;
441 /* Read in the backtrace information stored in the `$UNWIND_START$' section of
442 the object file. This info is used mainly by find_unwind_entry() to find
443 out the stack frame size and frame pointer used by procedures. We put
444 everything on the psymbol obstack in the objfile so that it automatically
445 gets freed when the objfile is destroyed. */
448 read_unwind_info (struct objfile *objfile)
450 asection *unwind_sec, *stub_unwind_sec;
451 unsigned unwind_size, stub_unwind_size, total_size;
452 unsigned index, unwind_entries;
453 unsigned stub_entries, total_entries;
454 CORE_ADDR text_offset;
455 struct obj_unwind_info *ui;
456 obj_private_data_t *obj_private;
458 text_offset = ANOFFSET (objfile->section_offsets, 0);
459 ui = (struct obj_unwind_info *) obstack_alloc (&objfile->psymbol_obstack,
460 sizeof (struct obj_unwind_info));
466 /* For reasons unknown the HP PA64 tools generate multiple unwinder
467 sections in a single executable. So we just iterate over every
468 section in the BFD looking for unwinder sections intead of trying
469 to do a lookup with bfd_get_section_by_name.
471 First determine the total size of the unwind tables so that we
472 can allocate memory in a nice big hunk. */
474 for (unwind_sec = objfile->obfd->sections;
476 unwind_sec = unwind_sec->next)
478 if (strcmp (unwind_sec->name, "$UNWIND_START$") == 0
479 || strcmp (unwind_sec->name, ".PARISC.unwind") == 0)
481 unwind_size = bfd_section_size (objfile->obfd, unwind_sec);
482 unwind_entries = unwind_size / UNWIND_ENTRY_SIZE;
484 total_entries += unwind_entries;
488 /* Now compute the size of the stub unwinds. Note the ELF tools do not
489 use stub unwinds at the curren time. */
490 stub_unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_END$");
494 stub_unwind_size = bfd_section_size (objfile->obfd, stub_unwind_sec);
495 stub_entries = stub_unwind_size / STUB_UNWIND_ENTRY_SIZE;
499 stub_unwind_size = 0;
503 /* Compute total number of unwind entries and their total size. */
504 total_entries += stub_entries;
505 total_size = total_entries * sizeof (struct unwind_table_entry);
507 /* Allocate memory for the unwind table. */
508 ui->table = (struct unwind_table_entry *)
509 obstack_alloc (&objfile->psymbol_obstack, total_size);
510 ui->last = total_entries - 1;
512 /* Now read in each unwind section and internalize the standard unwind
515 for (unwind_sec = objfile->obfd->sections;
517 unwind_sec = unwind_sec->next)
519 if (strcmp (unwind_sec->name, "$UNWIND_START$") == 0
520 || strcmp (unwind_sec->name, ".PARISC.unwind") == 0)
522 unwind_size = bfd_section_size (objfile->obfd, unwind_sec);
523 unwind_entries = unwind_size / UNWIND_ENTRY_SIZE;
525 internalize_unwinds (objfile, &ui->table[index], unwind_sec,
526 unwind_entries, unwind_size, text_offset);
527 index += unwind_entries;
531 /* Now read in and internalize the stub unwind entries. */
532 if (stub_unwind_size > 0)
535 char *buf = alloca (stub_unwind_size);
537 /* Read in the stub unwind entries. */
538 bfd_get_section_contents (objfile->obfd, stub_unwind_sec, buf,
539 0, stub_unwind_size);
541 /* Now convert them into regular unwind entries. */
542 for (i = 0; i < stub_entries; i++, index++)
544 /* Clear out the next unwind entry. */
545 memset (&ui->table[index], 0, sizeof (struct unwind_table_entry));
547 /* Convert offset & size into region_start and region_end.
548 Stuff away the stub type into "reserved" fields. */
549 ui->table[index].region_start = bfd_get_32 (objfile->obfd,
551 ui->table[index].region_start += text_offset;
553 ui->table[index].stub_unwind.stub_type = bfd_get_8 (objfile->obfd,
556 ui->table[index].region_end
557 = ui->table[index].region_start + 4 *
558 (bfd_get_16 (objfile->obfd, (bfd_byte *) buf) - 1);
564 /* Unwind table needs to be kept sorted. */
565 qsort (ui->table, total_entries, sizeof (struct unwind_table_entry),
566 compare_unwind_entries);
568 /* Keep a pointer to the unwind information. */
569 if (objfile->obj_private == NULL)
571 obj_private = (obj_private_data_t *)
572 obstack_alloc (&objfile->psymbol_obstack,
573 sizeof (obj_private_data_t));
574 obj_private->unwind_info = NULL;
575 obj_private->so_info = NULL;
578 objfile->obj_private = (PTR) obj_private;
580 obj_private = (obj_private_data_t *) objfile->obj_private;
581 obj_private->unwind_info = ui;
584 /* Lookup the unwind (stack backtrace) info for the given PC. We search all
585 of the objfiles seeking the unwind table entry for this PC. Each objfile
586 contains a sorted list of struct unwind_table_entry. Since we do a binary
587 search of the unwind tables, we depend upon them to be sorted. */
589 struct unwind_table_entry *
590 find_unwind_entry (CORE_ADDR pc)
592 int first, middle, last;
593 struct objfile *objfile;
595 /* A function at address 0? Not in HP-UX! */
596 if (pc == (CORE_ADDR) 0)
599 ALL_OBJFILES (objfile)
601 struct obj_unwind_info *ui;
603 if (objfile->obj_private)
604 ui = ((obj_private_data_t *) (objfile->obj_private))->unwind_info;
608 read_unwind_info (objfile);
609 if (objfile->obj_private == NULL)
610 error ("Internal error reading unwind information.");
611 ui = ((obj_private_data_t *) (objfile->obj_private))->unwind_info;
614 /* First, check the cache */
617 && pc >= ui->cache->region_start
618 && pc <= ui->cache->region_end)
621 /* Not in the cache, do a binary search */
626 while (first <= last)
628 middle = (first + last) / 2;
629 if (pc >= ui->table[middle].region_start
630 && pc <= ui->table[middle].region_end)
632 ui->cache = &ui->table[middle];
633 return &ui->table[middle];
636 if (pc < ui->table[middle].region_start)
641 } /* ALL_OBJFILES() */
645 /* Return the adjustment necessary to make for addresses on the stack
646 as presented by hpread.c.
648 This is necessary because of the stack direction on the PA and the
649 bizarre way in which someone (?) decided they wanted to handle
650 frame pointerless code in GDB. */
652 hpread_adjust_stack_address (CORE_ADDR func_addr)
654 struct unwind_table_entry *u;
656 u = find_unwind_entry (func_addr);
660 return u->Total_frame_size << 3;
663 /* Called to determine if PC is in an interrupt handler of some
667 pc_in_interrupt_handler (CORE_ADDR pc)
669 struct unwind_table_entry *u;
670 struct minimal_symbol *msym_us;
672 u = find_unwind_entry (pc);
676 /* Oh joys. HPUX sets the interrupt bit for _sigreturn even though
677 its frame isn't a pure interrupt frame. Deal with this. */
678 msym_us = lookup_minimal_symbol_by_pc (pc);
680 return (u->HP_UX_interrupt_marker
681 && !PC_IN_SIGTRAMP (pc, SYMBOL_NAME (msym_us)));
684 /* Called when no unwind descriptor was found for PC. Returns 1 if it
685 appears that PC is in a linker stub.
687 ?!? Need to handle stubs which appear in PA64 code. */
690 pc_in_linker_stub (CORE_ADDR pc)
692 int found_magic_instruction = 0;
696 /* If unable to read memory, assume pc is not in a linker stub. */
697 if (target_read_memory (pc, buf, 4) != 0)
700 /* We are looking for something like
702 ; $$dyncall jams RP into this special spot in the frame (RP')
703 ; before calling the "call stub"
706 ldsid (rp),r1 ; Get space associated with RP into r1
707 mtsp r1,sp ; Move it into space register 0
708 be,n 0(sr0),rp) ; back to your regularly scheduled program */
710 /* Maximum known linker stub size is 4 instructions. Search forward
711 from the given PC, then backward. */
712 for (i = 0; i < 4; i++)
714 /* If we hit something with an unwind, stop searching this direction. */
716 if (find_unwind_entry (pc + i * 4) != 0)
719 /* Check for ldsid (rp),r1 which is the magic instruction for a
720 return from a cross-space function call. */
721 if (read_memory_integer (pc + i * 4, 4) == 0x004010a1)
723 found_magic_instruction = 1;
726 /* Add code to handle long call/branch and argument relocation stubs
730 if (found_magic_instruction != 0)
733 /* Now look backward. */
734 for (i = 0; i < 4; i++)
736 /* If we hit something with an unwind, stop searching this direction. */
738 if (find_unwind_entry (pc - i * 4) != 0)
741 /* Check for ldsid (rp),r1 which is the magic instruction for a
742 return from a cross-space function call. */
743 if (read_memory_integer (pc - i * 4, 4) == 0x004010a1)
745 found_magic_instruction = 1;
748 /* Add code to handle long call/branch and argument relocation stubs
751 return found_magic_instruction;
755 find_return_regnum (CORE_ADDR pc)
757 struct unwind_table_entry *u;
759 u = find_unwind_entry (pc);
770 /* Return size of frame, or -1 if we should use a frame pointer. */
772 find_proc_framesize (CORE_ADDR pc)
774 struct unwind_table_entry *u;
775 struct minimal_symbol *msym_us;
777 /* This may indicate a bug in our callers... */
778 if (pc == (CORE_ADDR) 0)
781 u = find_unwind_entry (pc);
785 if (pc_in_linker_stub (pc))
786 /* Linker stubs have a zero size frame. */
792 msym_us = lookup_minimal_symbol_by_pc (pc);
794 /* If Save_SP is set, and we're not in an interrupt or signal caller,
795 then we have a frame pointer. Use it. */
797 && !pc_in_interrupt_handler (pc)
799 && !PC_IN_SIGTRAMP (pc, SYMBOL_NAME (msym_us)))
802 return u->Total_frame_size << 3;
805 /* Return offset from sp at which rp is saved, or 0 if not saved. */
806 static int rp_saved (CORE_ADDR);
809 rp_saved (CORE_ADDR pc)
811 struct unwind_table_entry *u;
813 /* A function at, and thus a return PC from, address 0? Not in HP-UX! */
814 if (pc == (CORE_ADDR) 0)
817 u = find_unwind_entry (pc);
821 if (pc_in_linker_stub (pc))
822 /* This is the so-called RP'. */
829 return (TARGET_PTR_BIT == 64 ? -16 : -20);
830 else if (u->stub_unwind.stub_type != 0)
832 switch (u->stub_unwind.stub_type)
837 case PARAMETER_RELOCATION:
848 hppa_frameless_function_invocation (struct frame_info *frame)
850 struct unwind_table_entry *u;
852 u = find_unwind_entry (frame->pc);
857 return (u->Total_frame_size == 0 && u->stub_unwind.stub_type == 0);
860 /* Immediately after a function call, return the saved pc.
861 Can't go through the frames for this because on some machines
862 the new frame is not set up until the new function executes
863 some instructions. */
866 hppa_saved_pc_after_call (struct frame_info *frame)
870 struct unwind_table_entry *u;
872 ret_regnum = find_return_regnum (get_frame_pc (frame));
873 pc = read_register (ret_regnum) & ~0x3;
875 /* If PC is in a linker stub, then we need to dig the address
876 the stub will return to out of the stack. */
877 u = find_unwind_entry (pc);
878 if (u && u->stub_unwind.stub_type != 0)
879 return FRAME_SAVED_PC (frame);
885 hppa_frame_saved_pc (struct frame_info *frame)
887 CORE_ADDR pc = get_frame_pc (frame);
888 struct unwind_table_entry *u;
890 int spun_around_loop = 0;
893 /* BSD, HPUX & OSF1 all lay out the hardware state in the same manner
894 at the base of the frame in an interrupt handler. Registers within
895 are saved in the exact same order as GDB numbers registers. How
897 if (pc_in_interrupt_handler (pc))
898 return read_memory_integer (frame->frame + PC_REGNUM * 4,
899 TARGET_PTR_BIT / 8) & ~0x3;
901 if ((frame->pc >= frame->frame
902 && frame->pc <= (frame->frame
903 /* A call dummy is sized in words, but it is
904 actually a series of instructions. Account
905 for that scaling factor. */
906 + ((REGISTER_SIZE / INSTRUCTION_SIZE)
908 /* Similarly we have to account for 64bit
909 wide register saves. */
910 + (32 * REGISTER_SIZE)
911 /* We always consider FP regs 8 bytes long. */
912 + (NUM_REGS - FP0_REGNUM) * 8
913 /* Similarly we have to account for 64bit
914 wide register saves. */
915 + (6 * REGISTER_SIZE))))
917 return read_memory_integer ((frame->frame
918 + (TARGET_PTR_BIT == 64 ? -16 : -20)),
919 TARGET_PTR_BIT / 8) & ~0x3;
922 #ifdef FRAME_SAVED_PC_IN_SIGTRAMP
923 /* Deal with signal handler caller frames too. */
924 if ((get_frame_type (frame) == SIGTRAMP_FRAME))
927 FRAME_SAVED_PC_IN_SIGTRAMP (frame, &rp);
932 if (hppa_frameless_function_invocation (frame))
936 ret_regnum = find_return_regnum (pc);
938 /* If the next frame is an interrupt frame or a signal
939 handler caller, then we need to look in the saved
940 register area to get the return pointer (the values
941 in the registers may not correspond to anything useful). */
943 && ((get_frame_type (frame->next) == SIGTRAMP_FRAME)
944 || pc_in_interrupt_handler (frame->next->pc)))
946 struct frame_saved_regs saved_regs;
948 deprecated_get_frame_saved_regs (frame->next, &saved_regs);
949 if (read_memory_integer (saved_regs.regs[FLAGS_REGNUM],
950 TARGET_PTR_BIT / 8) & 0x2)
952 pc = read_memory_integer (saved_regs.regs[31],
953 TARGET_PTR_BIT / 8) & ~0x3;
955 /* Syscalls are really two frames. The syscall stub itself
956 with a return pointer in %rp and the kernel call with
957 a return pointer in %r31. We return the %rp variant
958 if %r31 is the same as frame->pc. */
960 pc = read_memory_integer (saved_regs.regs[RP_REGNUM],
961 TARGET_PTR_BIT / 8) & ~0x3;
964 pc = read_memory_integer (saved_regs.regs[RP_REGNUM],
965 TARGET_PTR_BIT / 8) & ~0x3;
968 pc = read_register (ret_regnum) & ~0x3;
972 spun_around_loop = 0;
976 rp_offset = rp_saved (pc);
978 /* Similar to code in frameless function case. If the next
979 frame is a signal or interrupt handler, then dig the right
980 information out of the saved register info. */
983 && ((get_frame_type (frame->next) == SIGTRAMP_FRAME)
984 || pc_in_interrupt_handler (frame->next->pc)))
986 struct frame_saved_regs saved_regs;
988 deprecated_get_frame_saved_regs (frame->next, &saved_regs);
989 if (read_memory_integer (saved_regs.regs[FLAGS_REGNUM],
990 TARGET_PTR_BIT / 8) & 0x2)
992 pc = read_memory_integer (saved_regs.regs[31],
993 TARGET_PTR_BIT / 8) & ~0x3;
995 /* Syscalls are really two frames. The syscall stub itself
996 with a return pointer in %rp and the kernel call with
997 a return pointer in %r31. We return the %rp variant
998 if %r31 is the same as frame->pc. */
1000 pc = read_memory_integer (saved_regs.regs[RP_REGNUM],
1001 TARGET_PTR_BIT / 8) & ~0x3;
1004 pc = read_memory_integer (saved_regs.regs[RP_REGNUM],
1005 TARGET_PTR_BIT / 8) & ~0x3;
1007 else if (rp_offset == 0)
1010 pc = read_register (RP_REGNUM) & ~0x3;
1015 pc = read_memory_integer (frame->frame + rp_offset,
1016 TARGET_PTR_BIT / 8) & ~0x3;
1020 /* If PC is inside a linker stub, then dig out the address the stub
1023 Don't do this for long branch stubs. Why? For some unknown reason
1024 _start is marked as a long branch stub in hpux10. */
1025 u = find_unwind_entry (pc);
1026 if (u && u->stub_unwind.stub_type != 0
1027 && u->stub_unwind.stub_type != LONG_BRANCH)
1031 /* If this is a dynamic executable, and we're in a signal handler,
1032 then the call chain will eventually point us into the stub for
1033 _sigreturn. Unlike most cases, we'll be pointed to the branch
1034 to the real sigreturn rather than the code after the real branch!.
1036 Else, try to dig the address the stub will return to in the normal
1038 insn = read_memory_integer (pc, 4);
1039 if ((insn & 0xfc00e000) == 0xe8000000)
1040 return (pc + extract_17 (insn) + 8) & ~0x3;
1046 if (spun_around_loop > 1)
1048 /* We're just about to go around the loop again with
1049 no more hope of success. Die. */
1050 error ("Unable to find return pc for this frame");
1060 /* We need to correct the PC and the FP for the outermost frame when we are
1061 in a system call. */
1064 hppa_init_extra_frame_info (int fromleaf, struct frame_info *frame)
1069 if (frame->next && !fromleaf)
1072 /* If the next frame represents a frameless function invocation
1073 then we have to do some adjustments that are normally done by
1074 FRAME_CHAIN. (FRAME_CHAIN is not called in this case.) */
1077 /* Find the framesize of *this* frame without peeking at the PC
1078 in the current frame structure (it isn't set yet). */
1079 framesize = find_proc_framesize (FRAME_SAVED_PC (get_next_frame (frame)));
1081 /* Now adjust our base frame accordingly. If we have a frame pointer
1082 use it, else subtract the size of this frame from the current
1083 frame. (we always want frame->frame to point at the lowest address
1085 if (framesize == -1)
1086 frame->frame = TARGET_READ_FP ();
1088 frame->frame -= framesize;
1092 flags = read_register (FLAGS_REGNUM);
1093 if (flags & 2) /* In system call? */
1094 frame->pc = read_register (31) & ~0x3;
1096 /* The outermost frame is always derived from PC-framesize
1098 One might think frameless innermost frames should have
1099 a frame->frame that is the same as the parent's frame->frame.
1100 That is wrong; frame->frame in that case should be the *high*
1101 address of the parent's frame. It's complicated as hell to
1102 explain, but the parent *always* creates some stack space for
1103 the child. So the child actually does have a frame of some
1104 sorts, and its base is the high address in its parent's frame. */
1105 framesize = find_proc_framesize (frame->pc);
1106 if (framesize == -1)
1107 frame->frame = TARGET_READ_FP ();
1109 frame->frame = read_register (SP_REGNUM) - framesize;
1112 /* Given a GDB frame, determine the address of the calling function's
1113 frame. This will be used to create a new GDB frame struct, and
1114 then INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC will be
1115 called for the new frame.
1117 This may involve searching through prologues for several functions
1118 at boundaries where GCC calls HP C code, or where code which has
1119 a frame pointer calls code without a frame pointer. */
1122 hppa_frame_chain (struct frame_info *frame)
1124 int my_framesize, caller_framesize;
1125 struct unwind_table_entry *u;
1126 CORE_ADDR frame_base;
1127 struct frame_info *tmp_frame;
1129 /* A frame in the current frame list, or zero. */
1130 struct frame_info *saved_regs_frame = 0;
1131 /* Where the registers were saved in saved_regs_frame.
1132 If saved_regs_frame is zero, this is garbage. */
1133 struct frame_saved_regs saved_regs;
1135 CORE_ADDR caller_pc;
1137 struct minimal_symbol *min_frame_symbol;
1138 struct symbol *frame_symbol;
1139 char *frame_symbol_name;
1141 /* If this is a threaded application, and we see the
1142 routine "__pthread_exit", treat it as the stack root
1144 min_frame_symbol = lookup_minimal_symbol_by_pc (frame->pc);
1145 frame_symbol = find_pc_function (frame->pc);
1147 if ((min_frame_symbol != 0) /* && (frame_symbol == 0) */ )
1149 /* The test above for "no user function name" would defend
1150 against the slim likelihood that a user might define a
1151 routine named "__pthread_exit" and then try to debug it.
1153 If it weren't commented out, and you tried to debug the
1154 pthread library itself, you'd get errors.
1156 So for today, we don't make that check. */
1157 frame_symbol_name = SYMBOL_NAME (min_frame_symbol);
1158 if (frame_symbol_name != 0)
1160 if (0 == strncmp (frame_symbol_name,
1161 THREAD_INITIAL_FRAME_SYMBOL,
1162 THREAD_INITIAL_FRAME_SYM_LEN))
1164 /* Pretend we've reached the bottom of the stack. */
1165 return (CORE_ADDR) 0;
1168 } /* End of hacky code for threads. */
1170 /* Handle HPUX, BSD, and OSF1 style interrupt frames first. These
1171 are easy; at *sp we have a full save state strucutre which we can
1172 pull the old stack pointer from. Also see frame_saved_pc for
1173 code to dig a saved PC out of the save state structure. */
1174 if (pc_in_interrupt_handler (frame->pc))
1175 frame_base = read_memory_integer (frame->frame + SP_REGNUM * 4,
1176 TARGET_PTR_BIT / 8);
1177 #ifdef FRAME_BASE_BEFORE_SIGTRAMP
1178 else if ((get_frame_type (frame) == SIGTRAMP_FRAME))
1180 FRAME_BASE_BEFORE_SIGTRAMP (frame, &frame_base);
1184 frame_base = frame->frame;
1186 /* Get frame sizes for the current frame and the frame of the
1188 my_framesize = find_proc_framesize (frame->pc);
1189 caller_pc = FRAME_SAVED_PC (frame);
1191 /* If we can't determine the caller's PC, then it's not likely we can
1192 really determine anything meaningful about its frame. We'll consider
1193 this to be stack bottom. */
1194 if (caller_pc == (CORE_ADDR) 0)
1195 return (CORE_ADDR) 0;
1197 caller_framesize = find_proc_framesize (FRAME_SAVED_PC (frame));
1199 /* If caller does not have a frame pointer, then its frame
1200 can be found at current_frame - caller_framesize. */
1201 if (caller_framesize != -1)
1203 return frame_base - caller_framesize;
1205 /* Both caller and callee have frame pointers and are GCC compiled
1206 (SAVE_SP bit in unwind descriptor is on for both functions.
1207 The previous frame pointer is found at the top of the current frame. */
1208 if (caller_framesize == -1 && my_framesize == -1)
1210 return read_memory_integer (frame_base, TARGET_PTR_BIT / 8);
1212 /* Caller has a frame pointer, but callee does not. This is a little
1213 more difficult as GCC and HP C lay out locals and callee register save
1214 areas very differently.
1216 The previous frame pointer could be in a register, or in one of
1217 several areas on the stack.
1219 Walk from the current frame to the innermost frame examining
1220 unwind descriptors to determine if %r3 ever gets saved into the
1221 stack. If so return whatever value got saved into the stack.
1222 If it was never saved in the stack, then the value in %r3 is still
1225 We use information from unwind descriptors to determine if %r3
1226 is saved into the stack (Entry_GR field has this information). */
1228 for (tmp_frame = frame; tmp_frame; tmp_frame = tmp_frame->next)
1230 u = find_unwind_entry (tmp_frame->pc);
1234 /* We could find this information by examining prologues. I don't
1235 think anyone has actually written any tools (not even "strip")
1236 which leave them out of an executable, so maybe this is a moot
1238 /* ??rehrauer: Actually, it's quite possible to stepi your way into
1239 code that doesn't have unwind entries. For example, stepping into
1240 the dynamic linker will give you a PC that has none. Thus, I've
1241 disabled this warning. */
1243 warning ("Unable to find unwind for PC 0x%x -- Help!", tmp_frame->pc);
1245 return (CORE_ADDR) 0;
1249 || (get_frame_type (tmp_frame) == SIGTRAMP_FRAME)
1250 || pc_in_interrupt_handler (tmp_frame->pc))
1253 /* Entry_GR specifies the number of callee-saved general registers
1254 saved in the stack. It starts at %r3, so %r3 would be 1. */
1255 if (u->Entry_GR >= 1)
1257 /* The unwind entry claims that r3 is saved here. However,
1258 in optimized code, GCC often doesn't actually save r3.
1259 We'll discover this if we look at the prologue. */
1260 deprecated_get_frame_saved_regs (tmp_frame, &saved_regs);
1261 saved_regs_frame = tmp_frame;
1263 /* If we have an address for r3, that's good. */
1264 if (saved_regs.regs[FP_REGNUM])
1271 /* We may have walked down the chain into a function with a frame
1274 && !(get_frame_type (tmp_frame) == SIGTRAMP_FRAME)
1275 && !pc_in_interrupt_handler (tmp_frame->pc))
1277 return read_memory_integer (tmp_frame->frame, TARGET_PTR_BIT / 8);
1279 /* %r3 was saved somewhere in the stack. Dig it out. */
1284 For optimization purposes many kernels don't have the
1285 callee saved registers into the save_state structure upon
1286 entry into the kernel for a syscall; the optimization
1287 is usually turned off if the process is being traced so
1288 that the debugger can get full register state for the
1291 This scheme works well except for two cases:
1293 * Attaching to a process when the process is in the
1294 kernel performing a system call (debugger can't get
1295 full register state for the inferior process since
1296 the process wasn't being traced when it entered the
1299 * Register state is not complete if the system call
1300 causes the process to core dump.
1303 The following heinous code is an attempt to deal with
1304 the lack of register state in a core dump. It will
1305 fail miserably if the function which performs the
1306 system call has a variable sized stack frame. */
1308 if (tmp_frame != saved_regs_frame)
1309 deprecated_get_frame_saved_regs (tmp_frame, &saved_regs);
1311 /* Abominable hack. */
1312 if (current_target.to_has_execution == 0
1313 && ((saved_regs.regs[FLAGS_REGNUM]
1314 && (read_memory_integer (saved_regs.regs[FLAGS_REGNUM],
1317 || (saved_regs.regs[FLAGS_REGNUM] == 0
1318 && read_register (FLAGS_REGNUM) & 0x2)))
1320 u = find_unwind_entry (FRAME_SAVED_PC (frame));
1323 return read_memory_integer (saved_regs.regs[FP_REGNUM],
1324 TARGET_PTR_BIT / 8);
1328 return frame_base - (u->Total_frame_size << 3);
1332 return read_memory_integer (saved_regs.regs[FP_REGNUM],
1333 TARGET_PTR_BIT / 8);
1338 /* Get the innermost frame. */
1340 while (tmp_frame->next != NULL)
1341 tmp_frame = tmp_frame->next;
1343 if (tmp_frame != saved_regs_frame)
1344 deprecated_get_frame_saved_regs (tmp_frame, &saved_regs);
1346 /* Abominable hack. See above. */
1347 if (current_target.to_has_execution == 0
1348 && ((saved_regs.regs[FLAGS_REGNUM]
1349 && (read_memory_integer (saved_regs.regs[FLAGS_REGNUM],
1352 || (saved_regs.regs[FLAGS_REGNUM] == 0
1353 && read_register (FLAGS_REGNUM) & 0x2)))
1355 u = find_unwind_entry (FRAME_SAVED_PC (frame));
1358 return read_memory_integer (saved_regs.regs[FP_REGNUM],
1359 TARGET_PTR_BIT / 8);
1363 return frame_base - (u->Total_frame_size << 3);
1367 /* The value in %r3 was never saved into the stack (thus %r3 still
1368 holds the value of the previous frame pointer). */
1369 return TARGET_READ_FP ();
1374 /* To see if a frame chain is valid, see if the caller looks like it
1375 was compiled with gcc. */
1378 hppa_frame_chain_valid (CORE_ADDR chain, struct frame_info *thisframe)
1380 struct minimal_symbol *msym_us;
1381 struct minimal_symbol *msym_start;
1382 struct unwind_table_entry *u, *next_u = NULL;
1383 struct frame_info *next;
1388 u = find_unwind_entry (thisframe->pc);
1393 /* We can't just check that the same of msym_us is "_start", because
1394 someone idiotically decided that they were going to make a Ltext_end
1395 symbol with the same address. This Ltext_end symbol is totally
1396 indistinguishable (as nearly as I can tell) from the symbol for a function
1397 which is (legitimately, since it is in the user's namespace)
1398 named Ltext_end, so we can't just ignore it. */
1399 msym_us = lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe));
1400 msym_start = lookup_minimal_symbol ("_start", NULL, NULL);
1403 && SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start))
1406 /* Grrrr. Some new idiot decided that they don't want _start for the
1407 PRO configurations; $START$ calls main directly.... Deal with it. */
1408 msym_start = lookup_minimal_symbol ("$START$", NULL, NULL);
1411 && SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start))
1414 next = get_next_frame (thisframe);
1416 next_u = find_unwind_entry (next->pc);
1418 /* If this frame does not save SP, has no stack, isn't a stub,
1419 and doesn't "call" an interrupt routine or signal handler caller,
1420 then its not valid. */
1421 if (u->Save_SP || u->Total_frame_size || u->stub_unwind.stub_type != 0
1422 || (thisframe->next && (get_frame_type (thisframe->next) == SIGTRAMP_FRAME))
1423 || (next_u && next_u->HP_UX_interrupt_marker))
1426 if (pc_in_linker_stub (thisframe->pc))
1433 These functions deal with saving and restoring register state
1434 around a function call in the inferior. They keep the stack
1435 double-word aligned; eventually, on an hp700, the stack will have
1436 to be aligned to a 64-byte boundary. */
1439 hppa_push_dummy_frame (struct inferior_status *inf_status)
1441 CORE_ADDR sp, pc, pcspace;
1442 register int regnum;
1443 CORE_ADDR int_buffer;
1446 /* Oh, what a hack. If we're trying to perform an inferior call
1447 while the inferior is asleep, we have to make sure to clear
1448 the "in system call" bit in the flag register (the call will
1449 start after the syscall returns, so we're no longer in the system
1450 call!) This state is kept in "inf_status", change it there.
1452 We also need a number of horrid hacks to deal with lossage in the
1453 PC queue registers (apparently they're not valid when the in syscall
1455 pc = hppa_target_read_pc (inferior_ptid);
1456 int_buffer = read_register (FLAGS_REGNUM);
1457 if (int_buffer & 0x2)
1461 write_inferior_status_register (inf_status, 0, int_buffer);
1462 write_inferior_status_register (inf_status, PCOQ_HEAD_REGNUM, pc + 0);
1463 write_inferior_status_register (inf_status, PCOQ_TAIL_REGNUM, pc + 4);
1464 sid = (pc >> 30) & 0x3;
1466 pcspace = read_register (SR4_REGNUM);
1468 pcspace = read_register (SR4_REGNUM + 4 + sid);
1469 write_inferior_status_register (inf_status, PCSQ_HEAD_REGNUM, pcspace);
1470 write_inferior_status_register (inf_status, PCSQ_TAIL_REGNUM, pcspace);
1473 pcspace = read_register (PCSQ_HEAD_REGNUM);
1475 /* Space for "arguments"; the RP goes in here. */
1476 sp = read_register (SP_REGNUM) + 48;
1477 int_buffer = read_register (RP_REGNUM) | 0x3;
1479 /* The 32bit and 64bit ABIs save the return pointer into different
1481 if (REGISTER_SIZE == 8)
1482 write_memory (sp - 16, (char *) &int_buffer, REGISTER_SIZE);
1484 write_memory (sp - 20, (char *) &int_buffer, REGISTER_SIZE);
1486 int_buffer = TARGET_READ_FP ();
1487 write_memory (sp, (char *) &int_buffer, REGISTER_SIZE);
1489 write_register (FP_REGNUM, sp);
1491 sp += 2 * REGISTER_SIZE;
1493 for (regnum = 1; regnum < 32; regnum++)
1494 if (regnum != RP_REGNUM && regnum != FP_REGNUM)
1495 sp = push_word (sp, read_register (regnum));
1497 /* This is not necessary for the 64bit ABI. In fact it is dangerous. */
1498 if (REGISTER_SIZE != 8)
1501 for (regnum = FP0_REGNUM; regnum < NUM_REGS; regnum++)
1503 deprecated_read_register_bytes (REGISTER_BYTE (regnum),
1504 (char *) &freg_buffer, 8);
1505 sp = push_bytes (sp, (char *) &freg_buffer, 8);
1507 sp = push_word (sp, read_register (IPSW_REGNUM));
1508 sp = push_word (sp, read_register (SAR_REGNUM));
1509 sp = push_word (sp, pc);
1510 sp = push_word (sp, pcspace);
1511 sp = push_word (sp, pc + 4);
1512 sp = push_word (sp, pcspace);
1513 write_register (SP_REGNUM, sp);
1517 find_dummy_frame_regs (struct frame_info *frame,
1518 struct frame_saved_regs *frame_saved_regs)
1520 CORE_ADDR fp = frame->frame;
1523 /* The 32bit and 64bit ABIs save RP into different locations. */
1524 if (REGISTER_SIZE == 8)
1525 frame_saved_regs->regs[RP_REGNUM] = (fp - 16) & ~0x3;
1527 frame_saved_regs->regs[RP_REGNUM] = (fp - 20) & ~0x3;
1529 frame_saved_regs->regs[FP_REGNUM] = fp;
1531 frame_saved_regs->regs[1] = fp + (2 * REGISTER_SIZE);
1533 for (fp += 3 * REGISTER_SIZE, i = 3; i < 32; i++)
1537 frame_saved_regs->regs[i] = fp;
1538 fp += REGISTER_SIZE;
1542 /* This is not necessary or desirable for the 64bit ABI. */
1543 if (REGISTER_SIZE != 8)
1546 for (i = FP0_REGNUM; i < NUM_REGS; i++, fp += 8)
1547 frame_saved_regs->regs[i] = fp;
1549 frame_saved_regs->regs[IPSW_REGNUM] = fp;
1550 frame_saved_regs->regs[SAR_REGNUM] = fp + REGISTER_SIZE;
1551 frame_saved_regs->regs[PCOQ_HEAD_REGNUM] = fp + 2 * REGISTER_SIZE;
1552 frame_saved_regs->regs[PCSQ_HEAD_REGNUM] = fp + 3 * REGISTER_SIZE;
1553 frame_saved_regs->regs[PCOQ_TAIL_REGNUM] = fp + 4 * REGISTER_SIZE;
1554 frame_saved_regs->regs[PCSQ_TAIL_REGNUM] = fp + 5 * REGISTER_SIZE;
1558 hppa_pop_frame (void)
1560 register struct frame_info *frame = get_current_frame ();
1561 register CORE_ADDR fp, npc, target_pc;
1562 register int regnum;
1563 struct frame_saved_regs fsr;
1566 fp = get_frame_base (frame);
1567 deprecated_get_frame_saved_regs (frame, &fsr);
1569 #ifndef NO_PC_SPACE_QUEUE_RESTORE
1570 if (fsr.regs[IPSW_REGNUM]) /* Restoring a call dummy frame */
1571 restore_pc_queue (&fsr);
1574 for (regnum = 31; regnum > 0; regnum--)
1575 if (fsr.regs[regnum])
1576 write_register (regnum, read_memory_integer (fsr.regs[regnum],
1579 for (regnum = NUM_REGS - 1; regnum >= FP0_REGNUM; regnum--)
1580 if (fsr.regs[regnum])
1582 read_memory (fsr.regs[regnum], (char *) &freg_buffer, 8);
1583 deprecated_write_register_bytes (REGISTER_BYTE (regnum),
1584 (char *) &freg_buffer, 8);
1587 if (fsr.regs[IPSW_REGNUM])
1588 write_register (IPSW_REGNUM,
1589 read_memory_integer (fsr.regs[IPSW_REGNUM],
1592 if (fsr.regs[SAR_REGNUM])
1593 write_register (SAR_REGNUM,
1594 read_memory_integer (fsr.regs[SAR_REGNUM],
1597 /* If the PC was explicitly saved, then just restore it. */
1598 if (fsr.regs[PCOQ_TAIL_REGNUM])
1600 npc = read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM],
1602 write_register (PCOQ_TAIL_REGNUM, npc);
1604 /* Else use the value in %rp to set the new PC. */
1607 npc = read_register (RP_REGNUM);
1611 write_register (FP_REGNUM, read_memory_integer (fp, REGISTER_SIZE));
1613 if (fsr.regs[IPSW_REGNUM]) /* call dummy */
1614 write_register (SP_REGNUM, fp - 48);
1616 write_register (SP_REGNUM, fp);
1618 /* The PC we just restored may be inside a return trampoline. If so
1619 we want to restart the inferior and run it through the trampoline.
1621 Do this by setting a momentary breakpoint at the location the
1622 trampoline returns to.
1624 Don't skip through the trampoline if we're popping a dummy frame. */
1625 target_pc = SKIP_TRAMPOLINE_CODE (npc & ~0x3) & ~0x3;
1626 if (target_pc && !fsr.regs[IPSW_REGNUM])
1628 struct symtab_and_line sal;
1629 struct breakpoint *breakpoint;
1630 struct cleanup *old_chain;
1632 /* Set up our breakpoint. Set it to be silent as the MI code
1633 for "return_command" will print the frame we returned to. */
1634 sal = find_pc_line (target_pc, 0);
1636 breakpoint = set_momentary_breakpoint (sal, null_frame_id, bp_finish);
1637 breakpoint->silent = 1;
1639 /* So we can clean things up. */
1640 old_chain = make_cleanup_delete_breakpoint (breakpoint);
1642 /* Start up the inferior. */
1643 clear_proceed_status ();
1644 proceed_to_finish = 1;
1645 proceed ((CORE_ADDR) -1, TARGET_SIGNAL_DEFAULT, 0);
1647 /* Perform our cleanups. */
1648 do_cleanups (old_chain);
1650 flush_cached_frames ();
1653 /* After returning to a dummy on the stack, restore the instruction
1654 queue space registers. */
1657 restore_pc_queue (struct frame_saved_regs *fsr)
1659 CORE_ADDR pc = read_pc ();
1660 CORE_ADDR new_pc = read_memory_integer (fsr->regs[PCOQ_HEAD_REGNUM],
1661 TARGET_PTR_BIT / 8);
1662 struct target_waitstatus w;
1665 /* Advance past break instruction in the call dummy. */
1666 write_register (PCOQ_HEAD_REGNUM, pc + 4);
1667 write_register (PCOQ_TAIL_REGNUM, pc + 8);
1669 /* HPUX doesn't let us set the space registers or the space
1670 registers of the PC queue through ptrace. Boo, hiss.
1671 Conveniently, the call dummy has this sequence of instructions
1676 So, load up the registers and single step until we are in the
1679 write_register (21, read_memory_integer (fsr->regs[PCSQ_HEAD_REGNUM],
1681 write_register (22, new_pc);
1683 for (insn_count = 0; insn_count < 3; insn_count++)
1685 /* FIXME: What if the inferior gets a signal right now? Want to
1686 merge this into wait_for_inferior (as a special kind of
1687 watchpoint? By setting a breakpoint at the end? Is there
1688 any other choice? Is there *any* way to do this stuff with
1689 ptrace() or some equivalent?). */
1691 target_wait (inferior_ptid, &w);
1693 if (w.kind == TARGET_WAITKIND_SIGNALLED)
1695 stop_signal = w.value.sig;
1696 terminal_ours_for_output ();
1697 printf_unfiltered ("\nProgram terminated with signal %s, %s.\n",
1698 target_signal_to_name (stop_signal),
1699 target_signal_to_string (stop_signal));
1700 gdb_flush (gdb_stdout);
1704 target_terminal_ours ();
1705 target_fetch_registers (-1);
1710 #ifdef PA20W_CALLING_CONVENTIONS
1712 /* This function pushes a stack frame with arguments as part of the
1713 inferior function calling mechanism.
1715 This is the version for the PA64, in which later arguments appear
1716 at higher addresses. (The stack always grows towards higher
1719 We simply allocate the appropriate amount of stack space and put
1720 arguments into their proper slots. The call dummy code will copy
1721 arguments into registers as needed by the ABI.
1723 This ABI also requires that the caller provide an argument pointer
1724 to the callee, so we do that too. */
1727 hppa_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
1728 int struct_return, CORE_ADDR struct_addr)
1730 /* array of arguments' offsets */
1731 int *offset = (int *) alloca (nargs * sizeof (int));
1733 /* array of arguments' lengths: real lengths in bytes, not aligned to
1735 int *lengths = (int *) alloca (nargs * sizeof (int));
1737 /* The value of SP as it was passed into this function after
1739 CORE_ADDR orig_sp = STACK_ALIGN (sp);
1741 /* The number of stack bytes occupied by the current argument. */
1744 /* The total number of bytes reserved for the arguments. */
1745 int cum_bytes_reserved = 0;
1747 /* Similarly, but aligned. */
1748 int cum_bytes_aligned = 0;
1751 /* Iterate over each argument provided by the user. */
1752 for (i = 0; i < nargs; i++)
1754 struct type *arg_type = VALUE_TYPE (args[i]);
1756 /* Integral scalar values smaller than a register are padded on
1757 the left. We do this by promoting them to full-width,
1758 although the ABI says to pad them with garbage. */
1759 if (is_integral_type (arg_type)
1760 && TYPE_LENGTH (arg_type) < REGISTER_SIZE)
1762 args[i] = value_cast ((TYPE_UNSIGNED (arg_type)
1763 ? builtin_type_unsigned_long
1764 : builtin_type_long),
1766 arg_type = VALUE_TYPE (args[i]);
1769 lengths[i] = TYPE_LENGTH (arg_type);
1771 /* Align the size of the argument to the word size for this
1773 bytes_reserved = (lengths[i] + REGISTER_SIZE - 1) & -REGISTER_SIZE;
1775 offset[i] = cum_bytes_reserved;
1777 /* Aggregates larger than eight bytes (the only types larger
1778 than eight bytes we have) are aligned on a 16-byte boundary,
1779 possibly padded on the right with garbage. This may leave an
1780 empty word on the stack, and thus an unused register, as per
1782 if (bytes_reserved > 8)
1784 /* Round up the offset to a multiple of two slots. */
1785 int new_offset = ((offset[i] + 2*REGISTER_SIZE-1)
1786 & -(2*REGISTER_SIZE));
1788 /* Note the space we've wasted, if any. */
1789 bytes_reserved += new_offset - offset[i];
1790 offset[i] = new_offset;
1793 cum_bytes_reserved += bytes_reserved;
1796 /* CUM_BYTES_RESERVED already accounts for all the arguments
1797 passed by the user. However, the ABIs mandate minimum stack space
1798 allocations for outgoing arguments.
1800 The ABIs also mandate minimum stack alignments which we must
1802 cum_bytes_aligned = STACK_ALIGN (cum_bytes_reserved);
1803 sp += max (cum_bytes_aligned, REG_PARM_STACK_SPACE);
1805 /* Now write each of the args at the proper offset down the stack. */
1806 for (i = 0; i < nargs; i++)
1807 write_memory (orig_sp + offset[i], VALUE_CONTENTS (args[i]), lengths[i]);
1809 /* If a structure has to be returned, set up register 28 to hold its
1812 write_register (28, struct_addr);
1814 /* For the PA64 we must pass a pointer to the outgoing argument list.
1815 The ABI mandates that the pointer should point to the first byte of
1816 storage beyond the register flushback area.
1818 However, the call dummy expects the outgoing argument pointer to
1819 be passed in register %r4. */
1820 write_register (4, orig_sp + REG_PARM_STACK_SPACE);
1822 /* ?!? This needs further work. We need to set up the global data
1823 pointer for this procedure. This assumes the same global pointer
1824 for every procedure. The call dummy expects the dp value to
1825 be passed in register %r6. */
1826 write_register (6, read_register (27));
1828 /* The stack will have 64 bytes of additional space for a frame marker. */
1834 /* This function pushes a stack frame with arguments as part of the
1835 inferior function calling mechanism.
1837 This is the version of the function for the 32-bit PA machines, in
1838 which later arguments appear at lower addresses. (The stack always
1839 grows towards higher addresses.)
1841 We simply allocate the appropriate amount of stack space and put
1842 arguments into their proper slots. The call dummy code will copy
1843 arguments into registers as needed by the ABI. */
1846 hppa_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
1847 int struct_return, CORE_ADDR struct_addr)
1849 /* array of arguments' offsets */
1850 int *offset = (int *) alloca (nargs * sizeof (int));
1852 /* array of arguments' lengths: real lengths in bytes, not aligned to
1854 int *lengths = (int *) alloca (nargs * sizeof (int));
1856 /* The number of stack bytes occupied by the current argument. */
1859 /* The total number of bytes reserved for the arguments. */
1860 int cum_bytes_reserved = 0;
1862 /* Similarly, but aligned. */
1863 int cum_bytes_aligned = 0;
1866 /* Iterate over each argument provided by the user. */
1867 for (i = 0; i < nargs; i++)
1869 lengths[i] = TYPE_LENGTH (VALUE_TYPE (args[i]));
1871 /* Align the size of the argument to the word size for this
1873 bytes_reserved = (lengths[i] + REGISTER_SIZE - 1) & -REGISTER_SIZE;
1875 offset[i] = (cum_bytes_reserved
1876 + (lengths[i] > 4 ? bytes_reserved : lengths[i]));
1878 /* If the argument is a double word argument, then it needs to be
1879 double word aligned. */
1880 if ((bytes_reserved == 2 * REGISTER_SIZE)
1881 && (offset[i] % 2 * REGISTER_SIZE))
1884 /* BYTES_RESERVED is already aligned to the word, so we put
1885 the argument at one word more down the stack.
1887 This will leave one empty word on the stack, and one unused
1888 register as mandated by the ABI. */
1889 new_offset = ((offset[i] + 2 * REGISTER_SIZE - 1)
1890 & -(2 * REGISTER_SIZE));
1892 if ((new_offset - offset[i]) >= 2 * REGISTER_SIZE)
1894 bytes_reserved += REGISTER_SIZE;
1895 offset[i] += REGISTER_SIZE;
1899 cum_bytes_reserved += bytes_reserved;
1903 /* CUM_BYTES_RESERVED already accounts for all the arguments passed
1904 by the user. However, the ABI mandates minimum stack space
1905 allocations for outgoing arguments.
1907 The ABI also mandates minimum stack alignments which we must
1909 cum_bytes_aligned = STACK_ALIGN (cum_bytes_reserved);
1910 sp += max (cum_bytes_aligned, REG_PARM_STACK_SPACE);
1912 /* Now write each of the args at the proper offset down the stack.
1913 ?!? We need to promote values to a full register instead of skipping
1914 words in the stack. */
1915 for (i = 0; i < nargs; i++)
1916 write_memory (sp - offset[i], VALUE_CONTENTS (args[i]), lengths[i]);
1918 /* If a structure has to be returned, set up register 28 to hold its
1921 write_register (28, struct_addr);
1923 /* The stack will have 32 bytes of additional space for a frame marker. */
1929 /* elz: this function returns a value which is built looking at the given address.
1930 It is called from call_function_by_hand, in case we need to return a
1931 value which is larger than 64 bits, and it is stored in the stack rather than
1932 in the registers r28 and r29 or fr4.
1933 This function does the same stuff as value_being_returned in values.c, but
1934 gets the value from the stack rather than from the buffer where all the
1935 registers were saved when the function called completed. */
1937 hppa_value_returned_from_stack (register struct type *valtype, CORE_ADDR addr)
1939 register struct value *val;
1941 val = allocate_value (valtype);
1942 CHECK_TYPEDEF (valtype);
1943 target_read_memory (addr, VALUE_CONTENTS_RAW (val), TYPE_LENGTH (valtype));
1950 /* elz: Used to lookup a symbol in the shared libraries.
1951 This function calls shl_findsym, indirectly through a
1952 call to __d_shl_get. __d_shl_get is in end.c, which is always
1953 linked in by the hp compilers/linkers.
1954 The call to shl_findsym cannot be made directly because it needs
1955 to be active in target address space.
1956 inputs: - minimal symbol pointer for the function we want to look up
1957 - address in target space of the descriptor for the library
1958 where we want to look the symbol up.
1959 This address is retrieved using the
1960 som_solib_get_solib_by_pc function (somsolib.c).
1961 output: - real address in the library of the function.
1962 note: the handle can be null, in which case shl_findsym will look for
1963 the symbol in all the loaded shared libraries.
1964 files to look at if you need reference on this stuff:
1965 dld.c, dld_shl_findsym.c
1967 man entry for shl_findsym */
1970 find_stub_with_shl_get (struct minimal_symbol *function, CORE_ADDR handle)
1972 struct symbol *get_sym, *symbol2;
1973 struct minimal_symbol *buff_minsym, *msymbol;
1975 struct value **args;
1976 struct value *funcval;
1979 int x, namelen, err_value, tmp = -1;
1980 CORE_ADDR endo_buff_addr, value_return_addr, errno_return_addr;
1981 CORE_ADDR stub_addr;
1984 args = alloca (sizeof (struct value *) * 8); /* 6 for the arguments and one null one??? */
1985 funcval = find_function_in_inferior ("__d_shl_get");
1986 get_sym = lookup_symbol ("__d_shl_get", NULL, VAR_NAMESPACE, NULL, NULL);
1987 buff_minsym = lookup_minimal_symbol ("__buffer", NULL, NULL);
1988 msymbol = lookup_minimal_symbol ("__shldp", NULL, NULL);
1989 symbol2 = lookup_symbol ("__shldp", NULL, VAR_NAMESPACE, NULL, NULL);
1990 endo_buff_addr = SYMBOL_VALUE_ADDRESS (buff_minsym);
1991 namelen = strlen (SYMBOL_NAME (function));
1992 value_return_addr = endo_buff_addr + namelen;
1993 ftype = check_typedef (SYMBOL_TYPE (get_sym));
1996 if ((x = value_return_addr % 64) != 0)
1997 value_return_addr = value_return_addr + 64 - x;
1999 errno_return_addr = value_return_addr + 64;
2002 /* set up stuff needed by __d_shl_get in buffer in end.o */
2004 target_write_memory (endo_buff_addr, SYMBOL_NAME (function), namelen);
2006 target_write_memory (value_return_addr, (char *) &tmp, 4);
2008 target_write_memory (errno_return_addr, (char *) &tmp, 4);
2010 target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol),
2011 (char *) &handle, 4);
2013 /* now prepare the arguments for the call */
2015 args[0] = value_from_longest (TYPE_FIELD_TYPE (ftype, 0), 12);
2016 args[1] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 1), SYMBOL_VALUE_ADDRESS (msymbol));
2017 args[2] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 2), endo_buff_addr);
2018 args[3] = value_from_longest (TYPE_FIELD_TYPE (ftype, 3), TYPE_PROCEDURE);
2019 args[4] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 4), value_return_addr);
2020 args[5] = value_from_pointer (TYPE_FIELD_TYPE (ftype, 5), errno_return_addr);
2022 /* now call the function */
2024 val = call_function_by_hand (funcval, 6, args);
2026 /* now get the results */
2028 target_read_memory (errno_return_addr, (char *) &err_value, sizeof (err_value));
2030 target_read_memory (value_return_addr, (char *) &stub_addr, sizeof (stub_addr));
2032 error ("call to __d_shl_get failed, error code is %d", err_value);
2037 /* Cover routine for find_stub_with_shl_get to pass to catch_errors */
2039 cover_find_stub_with_shl_get (PTR args_untyped)
2041 args_for_find_stub *args = args_untyped;
2042 args->return_val = find_stub_with_shl_get (args->msym, args->solib_handle);
2046 /* Insert the specified number of args and function address
2047 into a call sequence of the above form stored at DUMMYNAME.
2049 On the hppa we need to call the stack dummy through $$dyncall.
2050 Therefore our version of FIX_CALL_DUMMY takes an extra argument,
2051 real_pc, which is the location where gdb should start up the
2052 inferior to do the function call.
2054 This has to work across several versions of hpux, bsd, osf1. It has to
2055 work regardless of what compiler was used to build the inferior program.
2056 It should work regardless of whether or not end.o is available. It has
2057 to work even if gdb can not call into the dynamic loader in the inferior
2058 to query it for symbol names and addresses.
2060 Yes, all those cases should work. Luckily code exists to handle most
2061 of them. The complexity is in selecting exactly what scheme should
2062 be used to perform the inferior call.
2064 At the current time this routine is known not to handle cases where
2065 the program was linked with HP's compiler without including end.o.
2067 Please contact Jeff Law (law@cygnus.com) before changing this code. */
2070 hppa_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
2071 struct value **args, struct type *type, int gcc_p)
2073 CORE_ADDR dyncall_addr;
2074 struct minimal_symbol *msymbol;
2075 struct minimal_symbol *trampoline;
2076 int flags = read_register (FLAGS_REGNUM);
2077 struct unwind_table_entry *u = NULL;
2078 CORE_ADDR new_stub = 0;
2079 CORE_ADDR solib_handle = 0;
2081 /* Nonzero if we will use GCC's PLT call routine. This routine must be
2082 passed an import stub, not a PLABEL. It is also necessary to set %r19
2083 (the PIC register) before performing the call.
2085 If zero, then we are using __d_plt_call (HP's PLT call routine) or we
2086 are calling the target directly. When using __d_plt_call we want to
2087 use a PLABEL instead of an import stub. */
2088 int using_gcc_plt_call = 1;
2090 #ifdef GDB_TARGET_IS_HPPA_20W
2091 /* We currently use completely different code for the PA2.0W inferior
2092 function call sequences. This needs to be cleaned up. */
2094 CORE_ADDR pcsqh, pcsqt, pcoqh, pcoqt, sr5;
2095 struct target_waitstatus w;
2099 struct objfile *objfile;
2101 /* We can not modify the PC space queues directly, so we start
2102 up the inferior and execute a couple instructions to set the
2103 space queues so that they point to the call dummy in the stack. */
2104 pcsqh = read_register (PCSQ_HEAD_REGNUM);
2105 sr5 = read_register (SR5_REGNUM);
2108 pcoqh = read_register (PCOQ_HEAD_REGNUM);
2109 pcoqt = read_register (PCOQ_TAIL_REGNUM);
2110 if (target_read_memory (pcoqh, buf, 4) != 0)
2111 error ("Couldn't modify space queue\n");
2112 inst1 = extract_unsigned_integer (buf, 4);
2114 if (target_read_memory (pcoqt, buf, 4) != 0)
2115 error ("Couldn't modify space queue\n");
2116 inst2 = extract_unsigned_integer (buf, 4);
2119 *((int *) buf) = 0xe820d000;
2120 if (target_write_memory (pcoqh, buf, 4) != 0)
2121 error ("Couldn't modify space queue\n");
2124 *((int *) buf) = 0x08000240;
2125 if (target_write_memory (pcoqt, buf, 4) != 0)
2127 *((int *) buf) = inst1;
2128 target_write_memory (pcoqh, buf, 4);
2129 error ("Couldn't modify space queue\n");
2132 write_register (1, pc);
2134 /* Single step twice, the BVE instruction will set the space queue
2135 such that it points to the PC value written immediately above
2136 (ie the call dummy). */
2138 target_wait (inferior_ptid, &w);
2140 target_wait (inferior_ptid, &w);
2142 /* Restore the two instructions at the old PC locations. */
2143 *((int *) buf) = inst1;
2144 target_write_memory (pcoqh, buf, 4);
2145 *((int *) buf) = inst2;
2146 target_write_memory (pcoqt, buf, 4);
2149 /* The call dummy wants the ultimate destination address initially
2151 write_register (5, fun);
2153 /* We need to see if this objfile has a different DP value than our
2154 own (it could be a shared library for example). */
2155 ALL_OBJFILES (objfile)
2157 struct obj_section *s;
2158 obj_private_data_t *obj_private;
2160 /* See if FUN is in any section within this shared library. */
2161 for (s = objfile->sections; s < objfile->sections_end; s++)
2162 if (s->addr <= fun && fun < s->endaddr)
2165 if (s >= objfile->sections_end)
2168 obj_private = (obj_private_data_t *) objfile->obj_private;
2170 /* The DP value may be different for each objfile. But within an
2171 objfile each function uses the same dp value. Thus we do not need
2172 to grope around the opd section looking for dp values.
2174 ?!? This is not strictly correct since we may be in a shared library
2175 and want to call back into the main program. To make that case
2176 work correctly we need to set obj_private->dp for the main program's
2177 objfile, then remove this conditional. */
2178 if (obj_private->dp)
2179 write_register (27, obj_private->dp);
2186 #ifndef GDB_TARGET_IS_HPPA_20W
2187 /* Prefer __gcc_plt_call over the HP supplied routine because
2188 __gcc_plt_call works for any number of arguments. */
2190 if (lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL) == NULL)
2191 using_gcc_plt_call = 0;
2193 msymbol = lookup_minimal_symbol ("$$dyncall", NULL, NULL);
2194 if (msymbol == NULL)
2195 error ("Can't find an address for $$dyncall trampoline");
2197 dyncall_addr = SYMBOL_VALUE_ADDRESS (msymbol);
2199 /* FUN could be a procedure label, in which case we have to get
2200 its real address and the value of its GOT/DP if we plan to
2201 call the routine via gcc_plt_call. */
2202 if ((fun & 0x2) && using_gcc_plt_call)
2204 /* Get the GOT/DP value for the target function. It's
2205 at *(fun+4). Note the call dummy is *NOT* allowed to
2206 trash %r19 before calling the target function. */
2207 write_register (19, read_memory_integer ((fun & ~0x3) + 4,
2210 /* Now get the real address for the function we are calling, it's
2212 fun = (CORE_ADDR) read_memory_integer (fun & ~0x3,
2213 TARGET_PTR_BIT / 8);
2218 #ifndef GDB_TARGET_IS_PA_ELF
2219 /* FUN could be an export stub, the real address of a function, or
2220 a PLABEL. When using gcc's PLT call routine we must call an import
2221 stub rather than the export stub or real function for lazy binding
2224 If we are using the gcc PLT call routine, then we need to
2225 get the import stub for the target function. */
2226 if (using_gcc_plt_call && som_solib_get_got_by_pc (fun))
2228 struct objfile *objfile;
2229 struct minimal_symbol *funsymbol, *stub_symbol;
2230 CORE_ADDR newfun = 0;
2232 funsymbol = lookup_minimal_symbol_by_pc (fun);
2234 error ("Unable to find minimal symbol for target function.\n");
2236 /* Search all the object files for an import symbol with the
2238 ALL_OBJFILES (objfile)
2241 = lookup_minimal_symbol_solib_trampoline
2242 (SYMBOL_NAME (funsymbol), NULL, objfile);
2245 stub_symbol = lookup_minimal_symbol (SYMBOL_NAME (funsymbol),
2248 /* Found a symbol with the right name. */
2251 struct unwind_table_entry *u;
2252 /* It must be a shared library trampoline. */
2253 if (MSYMBOL_TYPE (stub_symbol) != mst_solib_trampoline)
2256 /* It must also be an import stub. */
2257 u = find_unwind_entry (SYMBOL_VALUE (stub_symbol));
2259 || (u->stub_unwind.stub_type != IMPORT
2260 #ifdef GDB_NATIVE_HPUX_11
2261 /* Sigh. The hpux 10.20 dynamic linker will blow
2262 chunks if we perform a call to an unbound function
2263 via the IMPORT_SHLIB stub. The hpux 11.00 dynamic
2264 linker will blow chunks if we do not call the
2265 unbound function via the IMPORT_SHLIB stub.
2267 We currently have no way to select bevahior on just
2268 the target. However, we only support HPUX/SOM in
2269 native mode. So we conditinalize on a native
2270 #ifdef. Ugly. Ugly. Ugly */
2271 && u->stub_unwind.stub_type != IMPORT_SHLIB
2276 /* OK. Looks like the correct import stub. */
2277 newfun = SYMBOL_VALUE (stub_symbol);
2280 /* If we found an IMPORT stub, then we want to stop
2281 searching now. If we found an IMPORT_SHLIB, we want
2282 to continue the search in the hopes that we will find
2284 if (u->stub_unwind.stub_type == IMPORT)
2289 /* Ouch. We did not find an import stub. Make an attempt to
2290 do the right thing instead of just croaking. Most of the
2291 time this will actually work. */
2293 write_register (19, som_solib_get_got_by_pc (fun));
2295 u = find_unwind_entry (fun);
2297 && (u->stub_unwind.stub_type == IMPORT
2298 || u->stub_unwind.stub_type == IMPORT_SHLIB))
2299 trampoline = lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL);
2301 /* If we found the import stub in the shared library, then we have
2302 to set %r19 before we call the stub. */
2303 if (u && u->stub_unwind.stub_type == IMPORT_SHLIB)
2304 write_register (19, som_solib_get_got_by_pc (fun));
2309 /* If we are calling into another load module then have sr4export call the
2310 magic __d_plt_call routine which is linked in from end.o.
2312 You can't use _sr4export to make the call as the value in sp-24 will get
2313 fried and you end up returning to the wrong location. You can't call the
2314 target as the code to bind the PLT entry to a function can't return to a
2317 Also, query the dynamic linker in the inferior to provide a suitable
2318 PLABEL for the target function. */
2319 if (!using_gcc_plt_call)
2323 /* Get a handle for the shared library containing FUN. Given the
2324 handle we can query the shared library for a PLABEL. */
2325 solib_handle = som_solib_get_solib_by_pc (fun);
2329 struct minimal_symbol *fmsymbol = lookup_minimal_symbol_by_pc (fun);
2331 trampoline = lookup_minimal_symbol ("__d_plt_call", NULL, NULL);
2333 if (trampoline == NULL)
2335 error ("Can't find an address for __d_plt_call or __gcc_plt_call trampoline\nSuggest linking executable with -g or compiling with gcc.");
2338 /* This is where sr4export will jump to. */
2339 new_fun = SYMBOL_VALUE_ADDRESS (trampoline);
2341 /* If the function is in a shared library, then call __d_shl_get to
2342 get a PLABEL for the target function. */
2343 new_stub = find_stub_with_shl_get (fmsymbol, solib_handle);
2346 error ("Can't find an import stub for %s", SYMBOL_NAME (fmsymbol));
2348 /* We have to store the address of the stub in __shlib_funcptr. */
2349 msymbol = lookup_minimal_symbol ("__shlib_funcptr", NULL,
2350 (struct objfile *) NULL);
2352 if (msymbol == NULL)
2353 error ("Can't find an address for __shlib_funcptr");
2354 target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol),
2355 (char *) &new_stub, 4);
2357 /* We want sr4export to call __d_plt_call, so we claim it is
2358 the final target. Clear trampoline. */
2364 /* Store upper 21 bits of function address into ldil. fun will either be
2365 the final target (most cases) or __d_plt_call when calling into a shared
2366 library and __gcc_plt_call is not available. */
2367 store_unsigned_integer
2368 (&dummy[FUNC_LDIL_OFFSET],
2370 deposit_21 (fun >> 11,
2371 extract_unsigned_integer (&dummy[FUNC_LDIL_OFFSET],
2372 INSTRUCTION_SIZE)));
2374 /* Store lower 11 bits of function address into ldo */
2375 store_unsigned_integer
2376 (&dummy[FUNC_LDO_OFFSET],
2378 deposit_14 (fun & MASK_11,
2379 extract_unsigned_integer (&dummy[FUNC_LDO_OFFSET],
2380 INSTRUCTION_SIZE)));
2381 #ifdef SR4EXPORT_LDIL_OFFSET
2384 CORE_ADDR trampoline_addr;
2386 /* We may still need sr4export's address too. */
2388 if (trampoline == NULL)
2390 msymbol = lookup_minimal_symbol ("_sr4export", NULL, NULL);
2391 if (msymbol == NULL)
2392 error ("Can't find an address for _sr4export trampoline");
2394 trampoline_addr = SYMBOL_VALUE_ADDRESS (msymbol);
2397 trampoline_addr = SYMBOL_VALUE_ADDRESS (trampoline);
2400 /* Store upper 21 bits of trampoline's address into ldil */
2401 store_unsigned_integer
2402 (&dummy[SR4EXPORT_LDIL_OFFSET],
2404 deposit_21 (trampoline_addr >> 11,
2405 extract_unsigned_integer (&dummy[SR4EXPORT_LDIL_OFFSET],
2406 INSTRUCTION_SIZE)));
2408 /* Store lower 11 bits of trampoline's address into ldo */
2409 store_unsigned_integer
2410 (&dummy[SR4EXPORT_LDO_OFFSET],
2412 deposit_14 (trampoline_addr & MASK_11,
2413 extract_unsigned_integer (&dummy[SR4EXPORT_LDO_OFFSET],
2414 INSTRUCTION_SIZE)));
2418 write_register (22, pc);
2420 /* If we are in a syscall, then we should call the stack dummy
2421 directly. $$dyncall is not needed as the kernel sets up the
2422 space id registers properly based on the value in %r31. In
2423 fact calling $$dyncall will not work because the value in %r22
2424 will be clobbered on the syscall exit path.
2426 Similarly if the current PC is in a shared library. Note however,
2427 this scheme won't work if the shared library isn't mapped into
2428 the same space as the stack. */
2431 #ifndef GDB_TARGET_IS_PA_ELF
2432 else if (som_solib_get_got_by_pc (hppa_target_read_pc (inferior_ptid)))
2436 return dyncall_addr;
2440 /* If the pid is in a syscall, then the FP register is not readable.
2441 We'll return zero in that case, rather than attempting to read it
2442 and cause a warning. */
2445 hppa_read_fp (int pid)
2447 int flags = read_register (FLAGS_REGNUM);
2451 return (CORE_ADDR) 0;
2454 /* This is the only site that may directly read_register () the FP
2455 register. All others must use TARGET_READ_FP (). */
2456 return read_register (FP_REGNUM);
2460 hppa_target_read_fp (void)
2462 return hppa_read_fp (PIDGET (inferior_ptid));
2465 /* Get the PC from %r31 if currently in a syscall. Also mask out privilege
2469 hppa_target_read_pc (ptid_t ptid)
2471 int flags = read_register_pid (FLAGS_REGNUM, ptid);
2473 /* The following test does not belong here. It is OS-specific, and belongs
2475 /* Test SS_INSYSCALL */
2477 return read_register_pid (31, ptid) & ~0x3;
2479 return read_register_pid (PC_REGNUM, ptid) & ~0x3;
2482 /* Write out the PC. If currently in a syscall, then also write the new
2483 PC value into %r31. */
2486 hppa_target_write_pc (CORE_ADDR v, ptid_t ptid)
2488 int flags = read_register_pid (FLAGS_REGNUM, ptid);
2490 /* The following test does not belong here. It is OS-specific, and belongs
2492 /* If in a syscall, then set %r31. Also make sure to get the
2493 privilege bits set correctly. */
2494 /* Test SS_INSYSCALL */
2496 write_register_pid (31, v | 0x3, ptid);
2498 write_register_pid (PC_REGNUM, v, ptid);
2499 write_register_pid (NPC_REGNUM, v + 4, ptid);
2502 /* return the alignment of a type in bytes. Structures have the maximum
2503 alignment required by their fields. */
2506 hppa_alignof (struct type *type)
2508 int max_align, align, i;
2509 CHECK_TYPEDEF (type);
2510 switch (TYPE_CODE (type))
2515 return TYPE_LENGTH (type);
2516 case TYPE_CODE_ARRAY:
2517 return hppa_alignof (TYPE_FIELD_TYPE (type, 0));
2518 case TYPE_CODE_STRUCT:
2519 case TYPE_CODE_UNION:
2521 for (i = 0; i < TYPE_NFIELDS (type); i++)
2523 /* Bit fields have no real alignment. */
2524 /* if (!TYPE_FIELD_BITPOS (type, i)) */
2525 if (!TYPE_FIELD_BITSIZE (type, i)) /* elz: this should be bitsize */
2527 align = hppa_alignof (TYPE_FIELD_TYPE (type, i));
2528 max_align = max (max_align, align);
2537 /* Print the register regnum, or all registers if regnum is -1 */
2540 pa_do_registers_info (int regnum, int fpregs)
2542 char raw_regs[REGISTER_BYTES];
2545 /* Make a copy of gdb's save area (may cause actual
2546 reads from the target). */
2547 for (i = 0; i < NUM_REGS; i++)
2548 frame_register_read (deprecated_selected_frame, i, raw_regs + REGISTER_BYTE (i));
2551 pa_print_registers (raw_regs, regnum, fpregs);
2552 else if (regnum < FP4_REGNUM)
2556 /* Why is the value not passed through "extract_signed_integer"
2557 as in "pa_print_registers" below? */
2558 pa_register_look_aside (raw_regs, regnum, ®_val[0]);
2562 printf_unfiltered ("%s %lx\n", REGISTER_NAME (regnum), reg_val[1]);
2566 /* Fancy % formats to prevent leading zeros. */
2567 if (reg_val[0] == 0)
2568 printf_unfiltered ("%s %lx\n", REGISTER_NAME (regnum), reg_val[1]);
2570 printf_unfiltered ("%s %lx%8.8lx\n", REGISTER_NAME (regnum),
2571 reg_val[0], reg_val[1]);
2575 /* Note that real floating point values only start at
2576 FP4_REGNUM. FP0 and up are just status and error
2577 registers, which have integral (bit) values. */
2578 pa_print_fp_reg (regnum);
2581 /********** new function ********************/
2583 pa_do_strcat_registers_info (int regnum, int fpregs, struct ui_file *stream,
2584 enum precision_type precision)
2586 char raw_regs[REGISTER_BYTES];
2589 /* Make a copy of gdb's save area (may cause actual
2590 reads from the target). */
2591 for (i = 0; i < NUM_REGS; i++)
2592 frame_register_read (deprecated_selected_frame, i, raw_regs + REGISTER_BYTE (i));
2595 pa_strcat_registers (raw_regs, regnum, fpregs, stream);
2597 else if (regnum < FP4_REGNUM)
2601 /* Why is the value not passed through "extract_signed_integer"
2602 as in "pa_print_registers" below? */
2603 pa_register_look_aside (raw_regs, regnum, ®_val[0]);
2607 fprintf_unfiltered (stream, "%s %lx", REGISTER_NAME (regnum), reg_val[1]);
2611 /* Fancy % formats to prevent leading zeros. */
2612 if (reg_val[0] == 0)
2613 fprintf_unfiltered (stream, "%s %lx", REGISTER_NAME (regnum),
2616 fprintf_unfiltered (stream, "%s %lx%8.8lx", REGISTER_NAME (regnum),
2617 reg_val[0], reg_val[1]);
2621 /* Note that real floating point values only start at
2622 FP4_REGNUM. FP0 and up are just status and error
2623 registers, which have integral (bit) values. */
2624 pa_strcat_fp_reg (regnum, stream, precision);
2627 /* If this is a PA2.0 machine, fetch the real 64-bit register
2628 value. Otherwise use the info from gdb's saved register area.
2630 Note that reg_val is really expected to be an array of longs,
2631 with two elements. */
2633 pa_register_look_aside (char *raw_regs, int regnum, long *raw_val)
2635 static int know_which = 0; /* False */
2638 unsigned int offset;
2643 char buf[MAX_REGISTER_RAW_SIZE];
2648 if (CPU_PA_RISC2_0 == sysconf (_SC_CPU_VERSION))
2653 know_which = 1; /* True */
2661 raw_val[1] = *(long *) (raw_regs + REGISTER_BYTE (regnum));
2665 /* Code below copied from hppah-nat.c, with fixes for wide
2666 registers, using different area of save_state, etc. */
2667 if (regnum == FLAGS_REGNUM || regnum >= FP0_REGNUM ||
2668 !HAVE_STRUCT_SAVE_STATE_T || !HAVE_STRUCT_MEMBER_SS_WIDE)
2670 /* Use narrow regs area of save_state and default macro. */
2671 offset = U_REGS_OFFSET;
2672 regaddr = register_addr (regnum, offset);
2677 /* Use wide regs area, and calculate registers as 8 bytes wide.
2679 We'd like to do this, but current version of "C" doesn't
2682 offset = offsetof(save_state_t, ss_wide);
2684 Note that to avoid "C" doing typed pointer arithmetic, we
2685 have to cast away the type in our offset calculation:
2686 otherwise we get an offset of 1! */
2688 /* NB: save_state_t is not available before HPUX 9.
2689 The ss_wide field is not available previous to HPUX 10.20,
2690 so to avoid compile-time warnings, we only compile this for
2691 PA 2.0 processors. This control path should only be followed
2692 if we're debugging a PA 2.0 processor, so this should not cause
2695 /* #if the following code out so that this file can still be
2696 compiled on older HPUX boxes (< 10.20) which don't have
2697 this structure/structure member. */
2698 #if HAVE_STRUCT_SAVE_STATE_T == 1 && HAVE_STRUCT_MEMBER_SS_WIDE == 1
2701 offset = ((int) &temp.ss_wide) - ((int) &temp);
2702 regaddr = offset + regnum * 8;
2707 for (i = start; i < 2; i++)
2710 raw_val[i] = call_ptrace (PT_RUREGS, PIDGET (inferior_ptid),
2711 (PTRACE_ARG3_TYPE) regaddr, 0);
2714 /* Warning, not error, in case we are attached; sometimes the
2715 kernel doesn't let us at the registers. */
2716 char *err = safe_strerror (errno);
2717 char *msg = alloca (strlen (err) + 128);
2718 sprintf (msg, "reading register %s: %s", REGISTER_NAME (regnum), err);
2723 regaddr += sizeof (long);
2726 if (regnum == PCOQ_HEAD_REGNUM || regnum == PCOQ_TAIL_REGNUM)
2727 raw_val[1] &= ~0x3; /* I think we're masking out space bits */
2733 /* "Info all-reg" command */
2736 pa_print_registers (char *raw_regs, int regnum, int fpregs)
2739 /* Alas, we are compiled so that "long long" is 32 bits */
2742 int rows = 48, columns = 2;
2744 for (i = 0; i < rows; i++)
2746 for (j = 0; j < columns; j++)
2748 /* We display registers in column-major order. */
2749 int regnum = i + j * rows;
2751 /* Q: Why is the value passed through "extract_signed_integer",
2752 while above, in "pa_do_registers_info" it isn't?
2754 pa_register_look_aside (raw_regs, regnum, &raw_val[0]);
2756 /* Even fancier % formats to prevent leading zeros
2757 and still maintain the output in columns. */
2760 /* Being big-endian, on this machine the low bits
2761 (the ones we want to look at) are in the second longword. */
2762 long_val = extract_signed_integer (&raw_val[1], 4);
2763 printf_filtered ("%10.10s: %8lx ",
2764 REGISTER_NAME (regnum), long_val);
2768 /* raw_val = extract_signed_integer(&raw_val, 8); */
2769 if (raw_val[0] == 0)
2770 printf_filtered ("%10.10s: %8lx ",
2771 REGISTER_NAME (regnum), raw_val[1]);
2773 printf_filtered ("%10.10s: %8lx%8.8lx ",
2774 REGISTER_NAME (regnum),
2775 raw_val[0], raw_val[1]);
2778 printf_unfiltered ("\n");
2782 for (i = FP4_REGNUM; i < NUM_REGS; i++) /* FP4_REGNUM == 72 */
2783 pa_print_fp_reg (i);
2786 /************* new function ******************/
2788 pa_strcat_registers (char *raw_regs, int regnum, int fpregs,
2789 struct ui_file *stream)
2792 long raw_val[2]; /* Alas, we are compiled so that "long long" is 32 bits */
2794 enum precision_type precision;
2796 precision = unspecified_precision;
2798 for (i = 0; i < 18; i++)
2800 for (j = 0; j < 4; j++)
2802 /* Q: Why is the value passed through "extract_signed_integer",
2803 while above, in "pa_do_registers_info" it isn't?
2805 pa_register_look_aside (raw_regs, i + (j * 18), &raw_val[0]);
2807 /* Even fancier % formats to prevent leading zeros
2808 and still maintain the output in columns. */
2811 /* Being big-endian, on this machine the low bits
2812 (the ones we want to look at) are in the second longword. */
2813 long_val = extract_signed_integer (&raw_val[1], 4);
2814 fprintf_filtered (stream, "%8.8s: %8lx ",
2815 REGISTER_NAME (i + (j * 18)), long_val);
2819 /* raw_val = extract_signed_integer(&raw_val, 8); */
2820 if (raw_val[0] == 0)
2821 fprintf_filtered (stream, "%8.8s: %8lx ",
2822 REGISTER_NAME (i + (j * 18)), raw_val[1]);
2824 fprintf_filtered (stream, "%8.8s: %8lx%8.8lx ",
2825 REGISTER_NAME (i + (j * 18)), raw_val[0],
2829 fprintf_unfiltered (stream, "\n");
2833 for (i = FP4_REGNUM; i < NUM_REGS; i++) /* FP4_REGNUM == 72 */
2834 pa_strcat_fp_reg (i, stream, precision);
2838 pa_print_fp_reg (int i)
2840 char raw_buffer[MAX_REGISTER_RAW_SIZE];
2841 char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
2843 /* Get 32bits of data. */
2844 frame_register_read (deprecated_selected_frame, i, raw_buffer);
2846 /* Put it in the buffer. No conversions are ever necessary. */
2847 memcpy (virtual_buffer, raw_buffer, REGISTER_RAW_SIZE (i));
2849 fputs_filtered (REGISTER_NAME (i), gdb_stdout);
2850 print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), gdb_stdout);
2851 fputs_filtered ("(single precision) ", gdb_stdout);
2853 val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0, gdb_stdout, 0,
2854 1, 0, Val_pretty_default);
2855 printf_filtered ("\n");
2857 /* If "i" is even, then this register can also be a double-precision
2858 FP register. Dump it out as such. */
2861 /* Get the data in raw format for the 2nd half. */
2862 frame_register_read (deprecated_selected_frame, i + 1, raw_buffer);
2864 /* Copy it into the appropriate part of the virtual buffer. */
2865 memcpy (virtual_buffer + REGISTER_RAW_SIZE (i), raw_buffer,
2866 REGISTER_RAW_SIZE (i));
2868 /* Dump it as a double. */
2869 fputs_filtered (REGISTER_NAME (i), gdb_stdout);
2870 print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), gdb_stdout);
2871 fputs_filtered ("(double precision) ", gdb_stdout);
2873 val_print (builtin_type_double, virtual_buffer, 0, 0, gdb_stdout, 0,
2874 1, 0, Val_pretty_default);
2875 printf_filtered ("\n");
2879 /*************** new function ***********************/
2881 pa_strcat_fp_reg (int i, struct ui_file *stream, enum precision_type precision)
2883 char raw_buffer[MAX_REGISTER_RAW_SIZE];
2884 char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
2886 fputs_filtered (REGISTER_NAME (i), stream);
2887 print_spaces_filtered (8 - strlen (REGISTER_NAME (i)), stream);
2889 /* Get 32bits of data. */
2890 frame_register_read (deprecated_selected_frame, i, raw_buffer);
2892 /* Put it in the buffer. No conversions are ever necessary. */
2893 memcpy (virtual_buffer, raw_buffer, REGISTER_RAW_SIZE (i));
2895 if (precision == double_precision && (i % 2) == 0)
2898 char raw_buf[MAX_REGISTER_RAW_SIZE];
2900 /* Get the data in raw format for the 2nd half. */
2901 frame_register_read (deprecated_selected_frame, i + 1, raw_buf);
2903 /* Copy it into the appropriate part of the virtual buffer. */
2904 memcpy (virtual_buffer + REGISTER_RAW_SIZE (i), raw_buf, REGISTER_RAW_SIZE (i));
2906 val_print (builtin_type_double, virtual_buffer, 0, 0, stream, 0,
2907 1, 0, Val_pretty_default);
2912 val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0, stream, 0,
2913 1, 0, Val_pretty_default);
2918 /* Return one if PC is in the call path of a trampoline, else return zero.
2920 Note we return one for *any* call trampoline (long-call, arg-reloc), not
2921 just shared library trampolines (import, export). */
2924 hppa_in_solib_call_trampoline (CORE_ADDR pc, char *name)
2926 struct minimal_symbol *minsym;
2927 struct unwind_table_entry *u;
2928 static CORE_ADDR dyncall = 0;
2929 static CORE_ADDR sr4export = 0;
2931 #ifdef GDB_TARGET_IS_HPPA_20W
2932 /* PA64 has a completely different stub/trampoline scheme. Is it
2933 better? Maybe. It's certainly harder to determine with any
2934 certainty that we are in a stub because we can not refer to the
2937 The heuristic is simple. Try to lookup the current PC value in th
2938 minimal symbol table. If that fails, then assume we are not in a
2941 Then see if the PC value falls within the section bounds for the
2942 section containing the minimal symbol we found in the first
2943 step. If it does, then assume we are not in a stub and return.
2945 Finally peek at the instructions to see if they look like a stub. */
2947 struct minimal_symbol *minsym;
2952 minsym = lookup_minimal_symbol_by_pc (pc);
2956 sec = SYMBOL_BFD_SECTION (minsym);
2959 && sec->vma + sec->_cooked_size < pc)
2962 /* We might be in a stub. Peek at the instructions. Stubs are 3
2963 instructions long. */
2964 insn = read_memory_integer (pc, 4);
2966 /* Find out where we think we are within the stub. */
2967 if ((insn & 0xffffc00e) == 0x53610000)
2969 else if ((insn & 0xffffffff) == 0xe820d000)
2971 else if ((insn & 0xffffc00e) == 0x537b0000)
2976 /* Now verify each insn in the range looks like a stub instruction. */
2977 insn = read_memory_integer (addr, 4);
2978 if ((insn & 0xffffc00e) != 0x53610000)
2981 /* Now verify each insn in the range looks like a stub instruction. */
2982 insn = read_memory_integer (addr + 4, 4);
2983 if ((insn & 0xffffffff) != 0xe820d000)
2986 /* Now verify each insn in the range looks like a stub instruction. */
2987 insn = read_memory_integer (addr + 8, 4);
2988 if ((insn & 0xffffc00e) != 0x537b0000)
2991 /* Looks like a stub. */
2996 /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a
2999 /* First see if PC is in one of the two C-library trampolines. */
3002 minsym = lookup_minimal_symbol ("$$dyncall", NULL, NULL);
3004 dyncall = SYMBOL_VALUE_ADDRESS (minsym);
3011 minsym = lookup_minimal_symbol ("_sr4export", NULL, NULL);
3013 sr4export = SYMBOL_VALUE_ADDRESS (minsym);
3018 if (pc == dyncall || pc == sr4export)
3021 minsym = lookup_minimal_symbol_by_pc (pc);
3022 if (minsym && strcmp (SYMBOL_NAME (minsym), ".stub") == 0)
3025 /* Get the unwind descriptor corresponding to PC, return zero
3026 if no unwind was found. */
3027 u = find_unwind_entry (pc);
3031 /* If this isn't a linker stub, then return now. */
3032 if (u->stub_unwind.stub_type == 0)
3035 /* By definition a long-branch stub is a call stub. */
3036 if (u->stub_unwind.stub_type == LONG_BRANCH)
3039 /* The call and return path execute the same instructions within
3040 an IMPORT stub! So an IMPORT stub is both a call and return
3042 if (u->stub_unwind.stub_type == IMPORT)
3045 /* Parameter relocation stubs always have a call path and may have a
3047 if (u->stub_unwind.stub_type == PARAMETER_RELOCATION
3048 || u->stub_unwind.stub_type == EXPORT)
3052 /* Search forward from the current PC until we hit a branch
3053 or the end of the stub. */
3054 for (addr = pc; addr <= u->region_end; addr += 4)
3058 insn = read_memory_integer (addr, 4);
3060 /* Does it look like a bl? If so then it's the call path, if
3061 we find a bv or be first, then we're on the return path. */
3062 if ((insn & 0xfc00e000) == 0xe8000000)
3064 else if ((insn & 0xfc00e001) == 0xe800c000
3065 || (insn & 0xfc000000) == 0xe0000000)
3069 /* Should never happen. */
3070 warning ("Unable to find branch in parameter relocation stub.\n");
3074 /* Unknown stub type. For now, just return zero. */
3078 /* Return one if PC is in the return path of a trampoline, else return zero.
3080 Note we return one for *any* call trampoline (long-call, arg-reloc), not
3081 just shared library trampolines (import, export). */
3084 hppa_in_solib_return_trampoline (CORE_ADDR pc, char *name)
3086 struct unwind_table_entry *u;
3088 /* Get the unwind descriptor corresponding to PC, return zero
3089 if no unwind was found. */
3090 u = find_unwind_entry (pc);
3094 /* If this isn't a linker stub or it's just a long branch stub, then
3096 if (u->stub_unwind.stub_type == 0 || u->stub_unwind.stub_type == LONG_BRANCH)
3099 /* The call and return path execute the same instructions within
3100 an IMPORT stub! So an IMPORT stub is both a call and return
3102 if (u->stub_unwind.stub_type == IMPORT)
3105 /* Parameter relocation stubs always have a call path and may have a
3107 if (u->stub_unwind.stub_type == PARAMETER_RELOCATION
3108 || u->stub_unwind.stub_type == EXPORT)
3112 /* Search forward from the current PC until we hit a branch
3113 or the end of the stub. */
3114 for (addr = pc; addr <= u->region_end; addr += 4)
3118 insn = read_memory_integer (addr, 4);
3120 /* Does it look like a bl? If so then it's the call path, if
3121 we find a bv or be first, then we're on the return path. */
3122 if ((insn & 0xfc00e000) == 0xe8000000)
3124 else if ((insn & 0xfc00e001) == 0xe800c000
3125 || (insn & 0xfc000000) == 0xe0000000)
3129 /* Should never happen. */
3130 warning ("Unable to find branch in parameter relocation stub.\n");
3134 /* Unknown stub type. For now, just return zero. */
3139 /* Figure out if PC is in a trampoline, and if so find out where
3140 the trampoline will jump to. If not in a trampoline, return zero.
3142 Simple code examination probably is not a good idea since the code
3143 sequences in trampolines can also appear in user code.
3145 We use unwinds and information from the minimal symbol table to
3146 determine when we're in a trampoline. This won't work for ELF
3147 (yet) since it doesn't create stub unwind entries. Whether or
3148 not ELF will create stub unwinds or normal unwinds for linker
3149 stubs is still being debated.
3151 This should handle simple calls through dyncall or sr4export,
3152 long calls, argument relocation stubs, and dyncall/sr4export
3153 calling an argument relocation stub. It even handles some stubs
3154 used in dynamic executables. */
3157 hppa_skip_trampoline_code (CORE_ADDR pc)
3160 long prev_inst, curr_inst, loc;
3161 static CORE_ADDR dyncall = 0;
3162 static CORE_ADDR dyncall_external = 0;
3163 static CORE_ADDR sr4export = 0;
3164 struct minimal_symbol *msym;
3165 struct unwind_table_entry *u;
3167 /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a
3172 msym = lookup_minimal_symbol ("$$dyncall", NULL, NULL);
3174 dyncall = SYMBOL_VALUE_ADDRESS (msym);
3179 if (!dyncall_external)
3181 msym = lookup_minimal_symbol ("$$dyncall_external", NULL, NULL);
3183 dyncall_external = SYMBOL_VALUE_ADDRESS (msym);
3185 dyncall_external = -1;
3190 msym = lookup_minimal_symbol ("_sr4export", NULL, NULL);
3192 sr4export = SYMBOL_VALUE_ADDRESS (msym);
3197 /* Addresses passed to dyncall may *NOT* be the actual address
3198 of the function. So we may have to do something special. */
3201 pc = (CORE_ADDR) read_register (22);
3203 /* If bit 30 (counting from the left) is on, then pc is the address of
3204 the PLT entry for this function, not the address of the function
3205 itself. Bit 31 has meaning too, but only for MPE. */
3207 pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8);
3209 if (pc == dyncall_external)
3211 pc = (CORE_ADDR) read_register (22);
3212 pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8);
3214 else if (pc == sr4export)
3215 pc = (CORE_ADDR) (read_register (22));
3217 /* Get the unwind descriptor corresponding to PC, return zero
3218 if no unwind was found. */
3219 u = find_unwind_entry (pc);
3223 /* If this isn't a linker stub, then return now. */
3224 /* elz: attention here! (FIXME) because of a compiler/linker
3225 error, some stubs which should have a non zero stub_unwind.stub_type
3226 have unfortunately a value of zero. So this function would return here
3227 as if we were not in a trampoline. To fix this, we go look at the partial
3228 symbol information, which reports this guy as a stub.
3229 (FIXME): Unfortunately, we are not that lucky: it turns out that the
3230 partial symbol information is also wrong sometimes. This is because
3231 when it is entered (somread.c::som_symtab_read()) it can happen that
3232 if the type of the symbol (from the som) is Entry, and the symbol is
3233 in a shared library, then it can also be a trampoline. This would
3234 be OK, except that I believe the way they decide if we are ina shared library
3235 does not work. SOOOO..., even if we have a regular function w/o trampolines
3236 its minimal symbol can be assigned type mst_solib_trampoline.
3237 Also, if we find that the symbol is a real stub, then we fix the unwind
3238 descriptor, and define the stub type to be EXPORT.
3239 Hopefully this is correct most of the times. */
3240 if (u->stub_unwind.stub_type == 0)
3243 /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed
3244 we can delete all the code which appears between the lines */
3245 /*--------------------------------------------------------------------------*/
3246 msym = lookup_minimal_symbol_by_pc (pc);
3248 if (msym == NULL || MSYMBOL_TYPE (msym) != mst_solib_trampoline)
3249 return orig_pc == pc ? 0 : pc & ~0x3;
3251 else if (msym != NULL && MSYMBOL_TYPE (msym) == mst_solib_trampoline)
3253 struct objfile *objfile;
3254 struct minimal_symbol *msymbol;
3255 int function_found = 0;
3257 /* go look if there is another minimal symbol with the same name as
3258 this one, but with type mst_text. This would happen if the msym
3259 is an actual trampoline, in which case there would be another
3260 symbol with the same name corresponding to the real function */
3262 ALL_MSYMBOLS (objfile, msymbol)
3264 if (MSYMBOL_TYPE (msymbol) == mst_text
3265 && STREQ (SYMBOL_NAME (msymbol), SYMBOL_NAME (msym)))
3273 /* the type of msym is correct (mst_solib_trampoline), but
3274 the unwind info is wrong, so set it to the correct value */
3275 u->stub_unwind.stub_type = EXPORT;
3277 /* the stub type info in the unwind is correct (this is not a
3278 trampoline), but the msym type information is wrong, it
3279 should be mst_text. So we need to fix the msym, and also
3280 get out of this function */
3282 MSYMBOL_TYPE (msym) = mst_text;
3283 return orig_pc == pc ? 0 : pc & ~0x3;
3287 /*--------------------------------------------------------------------------*/
3290 /* It's a stub. Search for a branch and figure out where it goes.
3291 Note we have to handle multi insn branch sequences like ldil;ble.
3292 Most (all?) other branches can be determined by examining the contents
3293 of certain registers and the stack. */
3300 /* Make sure we haven't walked outside the range of this stub. */
3301 if (u != find_unwind_entry (loc))
3303 warning ("Unable to find branch in linker stub");
3304 return orig_pc == pc ? 0 : pc & ~0x3;
3307 prev_inst = curr_inst;
3308 curr_inst = read_memory_integer (loc, 4);
3310 /* Does it look like a branch external using %r1? Then it's the
3311 branch from the stub to the actual function. */
3312 if ((curr_inst & 0xffe0e000) == 0xe0202000)
3314 /* Yup. See if the previous instruction loaded
3315 a value into %r1. If so compute and return the jump address. */
3316 if ((prev_inst & 0xffe00000) == 0x20200000)
3317 return (extract_21 (prev_inst) + extract_17 (curr_inst)) & ~0x3;
3320 warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1).");
3321 return orig_pc == pc ? 0 : pc & ~0x3;
3325 /* Does it look like a be 0(sr0,%r21)? OR
3326 Does it look like a be, n 0(sr0,%r21)? OR
3327 Does it look like a bve (r21)? (this is on PA2.0)
3328 Does it look like a bve, n(r21)? (this is also on PA2.0)
3329 That's the branch from an
3330 import stub to an export stub.
3332 It is impossible to determine the target of the branch via
3333 simple examination of instructions and/or data (consider
3334 that the address in the plabel may be the address of the
3335 bind-on-reference routine in the dynamic loader).
3337 So we have try an alternative approach.
3339 Get the name of the symbol at our current location; it should
3340 be a stub symbol with the same name as the symbol in the
3343 Then lookup a minimal symbol with the same name; we should
3344 get the minimal symbol for the target routine in the shared
3345 library as those take precedence of import/export stubs. */
3346 if ((curr_inst == 0xe2a00000) ||
3347 (curr_inst == 0xe2a00002) ||
3348 (curr_inst == 0xeaa0d000) ||
3349 (curr_inst == 0xeaa0d002))
3351 struct minimal_symbol *stubsym, *libsym;
3353 stubsym = lookup_minimal_symbol_by_pc (loc);
3354 if (stubsym == NULL)
3356 warning ("Unable to find symbol for 0x%lx", loc);
3357 return orig_pc == pc ? 0 : pc & ~0x3;
3360 libsym = lookup_minimal_symbol (SYMBOL_NAME (stubsym), NULL, NULL);
3363 warning ("Unable to find library symbol for %s\n",
3364 SYMBOL_NAME (stubsym));
3365 return orig_pc == pc ? 0 : pc & ~0x3;
3368 return SYMBOL_VALUE (libsym);
3371 /* Does it look like bl X,%rp or bl X,%r0? Another way to do a
3372 branch from the stub to the actual function. */
3374 else if ((curr_inst & 0xffe0e000) == 0xe8400000
3375 || (curr_inst & 0xffe0e000) == 0xe8000000
3376 || (curr_inst & 0xffe0e000) == 0xe800A000)
3377 return (loc + extract_17 (curr_inst) + 8) & ~0x3;
3379 /* Does it look like bv (rp)? Note this depends on the
3380 current stack pointer being the same as the stack
3381 pointer in the stub itself! This is a branch on from the
3382 stub back to the original caller. */
3383 /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */
3384 else if ((curr_inst & 0xffe0f000) == 0xe840c000)
3386 /* Yup. See if the previous instruction loaded
3388 if (prev_inst == 0x4bc23ff1)
3389 return (read_memory_integer
3390 (read_register (SP_REGNUM) - 8, 4)) & ~0x3;
3393 warning ("Unable to find restore of %%rp before bv (%%rp).");
3394 return orig_pc == pc ? 0 : pc & ~0x3;
3398 /* elz: added this case to capture the new instruction
3399 at the end of the return part of an export stub used by
3400 the PA2.0: BVE, n (rp) */
3401 else if ((curr_inst & 0xffe0f000) == 0xe840d000)
3403 return (read_memory_integer
3404 (read_register (SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3;
3407 /* What about be,n 0(sr0,%rp)? It's just another way we return to
3408 the original caller from the stub. Used in dynamic executables. */
3409 else if (curr_inst == 0xe0400002)
3411 /* The value we jump to is sitting in sp - 24. But that's
3412 loaded several instructions before the be instruction.
3413 I guess we could check for the previous instruction being
3414 mtsp %r1,%sr0 if we want to do sanity checking. */
3415 return (read_memory_integer
3416 (read_register (SP_REGNUM) - 24, TARGET_PTR_BIT / 8)) & ~0x3;
3419 /* Haven't found the branch yet, but we're still in the stub.
3426 /* For the given instruction (INST), return any adjustment it makes
3427 to the stack pointer or zero for no adjustment.
3429 This only handles instructions commonly found in prologues. */
3432 prologue_inst_adjust_sp (unsigned long inst)
3434 /* This must persist across calls. */
3435 static int save_high21;
3437 /* The most common way to perform a stack adjustment ldo X(sp),sp */
3438 if ((inst & 0xffffc000) == 0x37de0000)
3439 return extract_14 (inst);
3442 if ((inst & 0xffe00000) == 0x6fc00000)
3443 return extract_14 (inst);
3445 /* std,ma X,D(sp) */
3446 if ((inst & 0xffe00008) == 0x73c00008)
3447 return (inst & 0x1 ? -1 << 13 : 0) | (((inst >> 4) & 0x3ff) << 3);
3449 /* addil high21,%r1; ldo low11,(%r1),%r30)
3450 save high bits in save_high21 for later use. */
3451 if ((inst & 0xffe00000) == 0x28200000)
3453 save_high21 = extract_21 (inst);
3457 if ((inst & 0xffff0000) == 0x343e0000)
3458 return save_high21 + extract_14 (inst);
3460 /* fstws as used by the HP compilers. */
3461 if ((inst & 0xffffffe0) == 0x2fd01220)
3462 return extract_5_load (inst);
3464 /* No adjustment. */
3468 /* Return nonzero if INST is a branch of some kind, else return zero. */
3471 is_branch (unsigned long inst)
3500 /* Return the register number for a GR which is saved by INST or
3501 zero it INST does not save a GR. */
3504 inst_saves_gr (unsigned long inst)
3506 /* Does it look like a stw? */
3507 if ((inst >> 26) == 0x1a || (inst >> 26) == 0x1b
3508 || (inst >> 26) == 0x1f
3509 || ((inst >> 26) == 0x1f
3510 && ((inst >> 6) == 0xa)))
3511 return extract_5R_store (inst);
3513 /* Does it look like a std? */
3514 if ((inst >> 26) == 0x1c
3515 || ((inst >> 26) == 0x03
3516 && ((inst >> 6) & 0xf) == 0xb))
3517 return extract_5R_store (inst);
3519 /* Does it look like a stwm? GCC & HPC may use this in prologues. */
3520 if ((inst >> 26) == 0x1b)
3521 return extract_5R_store (inst);
3523 /* Does it look like sth or stb? HPC versions 9.0 and later use these
3525 if ((inst >> 26) == 0x19 || (inst >> 26) == 0x18
3526 || ((inst >> 26) == 0x3
3527 && (((inst >> 6) & 0xf) == 0x8
3528 || (inst >> 6) & 0xf) == 0x9))
3529 return extract_5R_store (inst);
3534 /* Return the register number for a FR which is saved by INST or
3535 zero it INST does not save a FR.
3537 Note we only care about full 64bit register stores (that's the only
3538 kind of stores the prologue will use).
3540 FIXME: What about argument stores with the HP compiler in ANSI mode? */
3543 inst_saves_fr (unsigned long inst)
3545 /* is this an FSTD ? */
3546 if ((inst & 0xfc00dfc0) == 0x2c001200)
3547 return extract_5r_store (inst);
3548 if ((inst & 0xfc000002) == 0x70000002)
3549 return extract_5R_store (inst);
3550 /* is this an FSTW ? */
3551 if ((inst & 0xfc00df80) == 0x24001200)
3552 return extract_5r_store (inst);
3553 if ((inst & 0xfc000002) == 0x7c000000)
3554 return extract_5R_store (inst);
3558 /* Advance PC across any function entry prologue instructions
3559 to reach some "real" code.
3561 Use information in the unwind table to determine what exactly should
3562 be in the prologue. */
3566 skip_prologue_hard_way (CORE_ADDR pc)
3569 CORE_ADDR orig_pc = pc;
3570 unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp;
3571 unsigned long args_stored, status, i, restart_gr, restart_fr;
3572 struct unwind_table_entry *u;
3578 u = find_unwind_entry (pc);
3582 /* If we are not at the beginning of a function, then return now. */
3583 if ((pc & ~0x3) != u->region_start)
3586 /* This is how much of a frame adjustment we need to account for. */
3587 stack_remaining = u->Total_frame_size << 3;
3589 /* Magic register saves we want to know about. */
3590 save_rp = u->Save_RP;
3591 save_sp = u->Save_SP;
3593 /* An indication that args may be stored into the stack. Unfortunately
3594 the HPUX compilers tend to set this in cases where no args were
3598 /* Turn the Entry_GR field into a bitmask. */
3600 for (i = 3; i < u->Entry_GR + 3; i++)
3602 /* Frame pointer gets saved into a special location. */
3603 if (u->Save_SP && i == FP_REGNUM)
3606 save_gr |= (1 << i);
3608 save_gr &= ~restart_gr;
3610 /* Turn the Entry_FR field into a bitmask too. */
3612 for (i = 12; i < u->Entry_FR + 12; i++)
3613 save_fr |= (1 << i);
3614 save_fr &= ~restart_fr;
3616 /* Loop until we find everything of interest or hit a branch.
3618 For unoptimized GCC code and for any HP CC code this will never ever
3619 examine any user instructions.
3621 For optimzied GCC code we're faced with problems. GCC will schedule
3622 its prologue and make prologue instructions available for delay slot
3623 filling. The end result is user code gets mixed in with the prologue
3624 and a prologue instruction may be in the delay slot of the first branch
3627 Some unexpected things are expected with debugging optimized code, so
3628 we allow this routine to walk past user instructions in optimized
3630 while (save_gr || save_fr || save_rp || save_sp || stack_remaining > 0
3633 unsigned int reg_num;
3634 unsigned long old_stack_remaining, old_save_gr, old_save_fr;
3635 unsigned long old_save_rp, old_save_sp, next_inst;
3637 /* Save copies of all the triggers so we can compare them later
3639 old_save_gr = save_gr;
3640 old_save_fr = save_fr;
3641 old_save_rp = save_rp;
3642 old_save_sp = save_sp;
3643 old_stack_remaining = stack_remaining;
3645 status = target_read_memory (pc, buf, 4);
3646 inst = extract_unsigned_integer (buf, 4);
3652 /* Note the interesting effects of this instruction. */
3653 stack_remaining -= prologue_inst_adjust_sp (inst);
3655 /* There are limited ways to store the return pointer into the
3657 if (inst == 0x6bc23fd9 || inst == 0x0fc212c1)
3660 /* These are the only ways we save SP into the stack. At this time
3661 the HP compilers never bother to save SP into the stack. */
3662 if ((inst & 0xffffc000) == 0x6fc10000
3663 || (inst & 0xffffc00c) == 0x73c10008)
3666 /* Are we loading some register with an offset from the argument
3668 if ((inst & 0xffe00000) == 0x37a00000
3669 || (inst & 0xffffffe0) == 0x081d0240)
3675 /* Account for general and floating-point register saves. */
3676 reg_num = inst_saves_gr (inst);
3677 save_gr &= ~(1 << reg_num);
3679 /* Ugh. Also account for argument stores into the stack.
3680 Unfortunately args_stored only tells us that some arguments
3681 where stored into the stack. Not how many or what kind!
3683 This is a kludge as on the HP compiler sets this bit and it
3684 never does prologue scheduling. So once we see one, skip past
3685 all of them. We have similar code for the fp arg stores below.
3687 FIXME. Can still die if we have a mix of GR and FR argument
3689 if (reg_num >= (TARGET_PTR_BIT == 64 ? 19 : 23) && reg_num <= 26)
3691 while (reg_num >= (TARGET_PTR_BIT == 64 ? 19 : 23) && reg_num <= 26)
3694 status = target_read_memory (pc, buf, 4);
3695 inst = extract_unsigned_integer (buf, 4);
3698 reg_num = inst_saves_gr (inst);
3704 reg_num = inst_saves_fr (inst);
3705 save_fr &= ~(1 << reg_num);
3707 status = target_read_memory (pc + 4, buf, 4);
3708 next_inst = extract_unsigned_integer (buf, 4);
3714 /* We've got to be read to handle the ldo before the fp register
3716 if ((inst & 0xfc000000) == 0x34000000
3717 && inst_saves_fr (next_inst) >= 4
3718 && inst_saves_fr (next_inst) <= (TARGET_PTR_BIT == 64 ? 11 : 7))
3720 /* So we drop into the code below in a reasonable state. */
3721 reg_num = inst_saves_fr (next_inst);
3725 /* Ugh. Also account for argument stores into the stack.
3726 This is a kludge as on the HP compiler sets this bit and it
3727 never does prologue scheduling. So once we see one, skip past
3729 if (reg_num >= 4 && reg_num <= (TARGET_PTR_BIT == 64 ? 11 : 7))
3731 while (reg_num >= 4 && reg_num <= (TARGET_PTR_BIT == 64 ? 11 : 7))
3734 status = target_read_memory (pc, buf, 4);
3735 inst = extract_unsigned_integer (buf, 4);
3738 if ((inst & 0xfc000000) != 0x34000000)
3740 status = target_read_memory (pc + 4, buf, 4);
3741 next_inst = extract_unsigned_integer (buf, 4);
3744 reg_num = inst_saves_fr (next_inst);
3750 /* Quit if we hit any kind of branch. This can happen if a prologue
3751 instruction is in the delay slot of the first call/branch. */
3752 if (is_branch (inst))
3755 /* What a crock. The HP compilers set args_stored even if no
3756 arguments were stored into the stack (boo hiss). This could
3757 cause this code to then skip a bunch of user insns (up to the
3760 To combat this we try to identify when args_stored was bogusly
3761 set and clear it. We only do this when args_stored is nonzero,
3762 all other resources are accounted for, and nothing changed on
3765 && !(save_gr || save_fr || save_rp || save_sp || stack_remaining > 0)
3766 && old_save_gr == save_gr && old_save_fr == save_fr
3767 && old_save_rp == save_rp && old_save_sp == save_sp
3768 && old_stack_remaining == stack_remaining)
3775 /* We've got a tenative location for the end of the prologue. However
3776 because of limitations in the unwind descriptor mechanism we may
3777 have went too far into user code looking for the save of a register
3778 that does not exist. So, if there registers we expected to be saved
3779 but never were, mask them out and restart.
3781 This should only happen in optimized code, and should be very rare. */
3782 if (save_gr || (save_fr && !(restart_fr || restart_gr)))
3785 restart_gr = save_gr;
3786 restart_fr = save_fr;
3794 /* Return the address of the PC after the last prologue instruction if
3795 we can determine it from the debug symbols. Else return zero. */
3798 after_prologue (CORE_ADDR pc)
3800 struct symtab_and_line sal;
3801 CORE_ADDR func_addr, func_end;
3804 /* If we can not find the symbol in the partial symbol table, then
3805 there is no hope we can determine the function's start address
3807 if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end))
3810 /* Get the line associated with FUNC_ADDR. */
3811 sal = find_pc_line (func_addr, 0);
3813 /* There are only two cases to consider. First, the end of the source line
3814 is within the function bounds. In that case we return the end of the
3815 source line. Second is the end of the source line extends beyond the
3816 bounds of the current function. We need to use the slow code to
3817 examine instructions in that case.
3819 Anything else is simply a bug elsewhere. Fixing it here is absolutely
3820 the wrong thing to do. In fact, it should be entirely possible for this
3821 function to always return zero since the slow instruction scanning code
3822 is supposed to *always* work. If it does not, then it is a bug. */
3823 if (sal.end < func_end)
3829 /* To skip prologues, I use this predicate. Returns either PC itself
3830 if the code at PC does not look like a function prologue; otherwise
3831 returns an address that (if we're lucky) follows the prologue. If
3832 LENIENT, then we must skip everything which is involved in setting
3833 up the frame (it's OK to skip more, just so long as we don't skip
3834 anything which might clobber the registers which are being saved.
3835 Currently we must not skip more on the alpha, but we might the lenient
3839 hppa_skip_prologue (CORE_ADDR pc)
3843 CORE_ADDR post_prologue_pc;
3846 /* See if we can determine the end of the prologue via the symbol table.
3847 If so, then return either PC, or the PC after the prologue, whichever
3850 post_prologue_pc = after_prologue (pc);
3852 /* If after_prologue returned a useful address, then use it. Else
3853 fall back on the instruction skipping code.
3855 Some folks have claimed this causes problems because the breakpoint
3856 may be the first instruction of the prologue. If that happens, then
3857 the instruction skipping code has a bug that needs to be fixed. */
3858 if (post_prologue_pc != 0)
3859 return max (pc, post_prologue_pc);
3861 return (skip_prologue_hard_way (pc));
3864 /* Put here the code to store, into a struct frame_saved_regs,
3865 the addresses of the saved registers of frame described by FRAME_INFO.
3866 This includes special registers such as pc and fp saved in special
3867 ways in the stack frame. sp is even more special:
3868 the address we return for it IS the sp for the next frame. */
3871 hppa_frame_find_saved_regs (struct frame_info *frame_info,
3872 struct frame_saved_regs *frame_saved_regs)
3875 struct unwind_table_entry *u;
3876 unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp;
3880 int final_iteration;
3882 /* Zero out everything. */
3883 memset (frame_saved_regs, '\0', sizeof (struct frame_saved_regs));
3885 /* Call dummy frames always look the same, so there's no need to
3886 examine the dummy code to determine locations of saved registers;
3887 instead, let find_dummy_frame_regs fill in the correct offsets
3888 for the saved registers. */
3889 if ((frame_info->pc >= frame_info->frame
3890 && frame_info->pc <= (frame_info->frame
3891 /* A call dummy is sized in words, but it is
3892 actually a series of instructions. Account
3893 for that scaling factor. */
3894 + ((REGISTER_SIZE / INSTRUCTION_SIZE)
3895 * CALL_DUMMY_LENGTH)
3896 /* Similarly we have to account for 64bit
3897 wide register saves. */
3898 + (32 * REGISTER_SIZE)
3899 /* We always consider FP regs 8 bytes long. */
3900 + (NUM_REGS - FP0_REGNUM) * 8
3901 /* Similarly we have to account for 64bit
3902 wide register saves. */
3903 + (6 * REGISTER_SIZE))))
3904 find_dummy_frame_regs (frame_info, frame_saved_regs);
3906 /* Interrupt handlers are special too. They lay out the register
3907 state in the exact same order as the register numbers in GDB. */
3908 if (pc_in_interrupt_handler (frame_info->pc))
3910 for (i = 0; i < NUM_REGS; i++)
3912 /* SP is a little special. */
3914 frame_saved_regs->regs[SP_REGNUM]
3915 = read_memory_integer (frame_info->frame + SP_REGNUM * 4,
3916 TARGET_PTR_BIT / 8);
3918 frame_saved_regs->regs[i] = frame_info->frame + i * 4;
3923 #ifdef FRAME_FIND_SAVED_REGS_IN_SIGTRAMP
3924 /* Handle signal handler callers. */
3925 if ((get_frame_type (frame_info) == SIGTRAMP_FRAME))
3927 FRAME_FIND_SAVED_REGS_IN_SIGTRAMP (frame_info, frame_saved_regs);
3932 /* Get the starting address of the function referred to by the PC
3934 pc = get_pc_function_start (frame_info->pc);
3937 u = find_unwind_entry (pc);
3941 /* This is how much of a frame adjustment we need to account for. */
3942 stack_remaining = u->Total_frame_size << 3;
3944 /* Magic register saves we want to know about. */
3945 save_rp = u->Save_RP;
3946 save_sp = u->Save_SP;
3948 /* Turn the Entry_GR field into a bitmask. */
3950 for (i = 3; i < u->Entry_GR + 3; i++)
3952 /* Frame pointer gets saved into a special location. */
3953 if (u->Save_SP && i == FP_REGNUM)
3956 save_gr |= (1 << i);
3959 /* Turn the Entry_FR field into a bitmask too. */
3961 for (i = 12; i < u->Entry_FR + 12; i++)
3962 save_fr |= (1 << i);
3964 /* The frame always represents the value of %sp at entry to the
3965 current function (and is thus equivalent to the "saved" stack
3967 frame_saved_regs->regs[SP_REGNUM] = frame_info->frame;
3969 /* Loop until we find everything of interest or hit a branch.
3971 For unoptimized GCC code and for any HP CC code this will never ever
3972 examine any user instructions.
3974 For optimized GCC code we're faced with problems. GCC will schedule
3975 its prologue and make prologue instructions available for delay slot
3976 filling. The end result is user code gets mixed in with the prologue
3977 and a prologue instruction may be in the delay slot of the first branch
3980 Some unexpected things are expected with debugging optimized code, so
3981 we allow this routine to walk past user instructions in optimized
3983 final_iteration = 0;
3984 while ((save_gr || save_fr || save_rp || save_sp || stack_remaining > 0)
3985 && pc <= frame_info->pc)
3987 status = target_read_memory (pc, buf, 4);
3988 inst = extract_unsigned_integer (buf, 4);
3994 /* Note the interesting effects of this instruction. */
3995 stack_remaining -= prologue_inst_adjust_sp (inst);
3997 /* There are limited ways to store the return pointer into the
3999 if (inst == 0x6bc23fd9) /* stw rp,-0x14(sr0,sp) */
4002 frame_saved_regs->regs[RP_REGNUM] = frame_info->frame - 20;
4004 else if (inst == 0x0fc212c1) /* std rp,-0x10(sr0,sp) */
4007 frame_saved_regs->regs[RP_REGNUM] = frame_info->frame - 16;
4010 /* Note if we saved SP into the stack. This also happens to indicate
4011 the location of the saved frame pointer. */
4012 if ( (inst & 0xffffc000) == 0x6fc10000 /* stw,ma r1,N(sr0,sp) */
4013 || (inst & 0xffffc00c) == 0x73c10008) /* std,ma r1,N(sr0,sp) */
4015 frame_saved_regs->regs[FP_REGNUM] = frame_info->frame;
4019 /* Account for general and floating-point register saves. */
4020 reg = inst_saves_gr (inst);
4021 if (reg >= 3 && reg <= 18
4022 && (!u->Save_SP || reg != FP_REGNUM))
4024 save_gr &= ~(1 << reg);
4026 /* stwm with a positive displacement is a *post modify*. */
4027 if ((inst >> 26) == 0x1b
4028 && extract_14 (inst) >= 0)
4029 frame_saved_regs->regs[reg] = frame_info->frame;
4030 /* A std has explicit post_modify forms. */
4031 else if ((inst & 0xfc00000c0) == 0x70000008)
4032 frame_saved_regs->regs[reg] = frame_info->frame;
4037 if ((inst >> 26) == 0x1c)
4038 offset = (inst & 0x1 ? -1 << 13 : 0) | (((inst >> 4) & 0x3ff) << 3);
4039 else if ((inst >> 26) == 0x03)
4040 offset = low_sign_extend (inst & 0x1f, 5);
4042 offset = extract_14 (inst);
4044 /* Handle code with and without frame pointers. */
4046 frame_saved_regs->regs[reg]
4047 = frame_info->frame + offset;
4049 frame_saved_regs->regs[reg]
4050 = (frame_info->frame + (u->Total_frame_size << 3)
4056 /* GCC handles callee saved FP regs a little differently.
4058 It emits an instruction to put the value of the start of
4059 the FP store area into %r1. It then uses fstds,ma with
4060 a basereg of %r1 for the stores.
4062 HP CC emits them at the current stack pointer modifying
4063 the stack pointer as it stores each register. */
4065 /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */
4066 if ((inst & 0xffffc000) == 0x34610000
4067 || (inst & 0xffffc000) == 0x37c10000)
4068 fp_loc = extract_14 (inst);
4070 reg = inst_saves_fr (inst);
4071 if (reg >= 12 && reg <= 21)
4073 /* Note +4 braindamage below is necessary because the FP status
4074 registers are internally 8 registers rather than the expected
4076 save_fr &= ~(1 << reg);
4079 /* 1st HP CC FP register store. After this instruction
4080 we've set enough state that the GCC and HPCC code are
4081 both handled in the same manner. */
4082 frame_saved_regs->regs[reg + FP4_REGNUM + 4] = frame_info->frame;
4087 frame_saved_regs->regs[reg + FP0_REGNUM + 4]
4088 = frame_info->frame + fp_loc;
4093 /* Quit if we hit any kind of branch the previous iteration. */
4094 if (final_iteration)
4097 /* We want to look precisely one instruction beyond the branch
4098 if we have not found everything yet. */
4099 if (is_branch (inst))
4100 final_iteration = 1;
4108 /* Exception handling support for the HP-UX ANSI C++ compiler.
4109 The compiler (aCC) provides a callback for exception events;
4110 GDB can set a breakpoint on this callback and find out what
4111 exception event has occurred. */
4113 /* The name of the hook to be set to point to the callback function */
4114 static char HP_ACC_EH_notify_hook[] = "__eh_notify_hook";
4115 /* The name of the function to be used to set the hook value */
4116 static char HP_ACC_EH_set_hook_value[] = "__eh_set_hook_value";
4117 /* The name of the callback function in end.o */
4118 static char HP_ACC_EH_notify_callback[] = "__d_eh_notify_callback";
4119 /* Name of function in end.o on which a break is set (called by above) */
4120 static char HP_ACC_EH_break[] = "__d_eh_break";
4121 /* Name of flag (in end.o) that enables catching throws */
4122 static char HP_ACC_EH_catch_throw[] = "__d_eh_catch_throw";
4123 /* Name of flag (in end.o) that enables catching catching */
4124 static char HP_ACC_EH_catch_catch[] = "__d_eh_catch_catch";
4125 /* The enum used by aCC */
4133 /* Is exception-handling support available with this executable? */
4134 static int hp_cxx_exception_support = 0;
4135 /* Has the initialize function been run? */
4136 int hp_cxx_exception_support_initialized = 0;
4137 /* Similar to above, but imported from breakpoint.c -- non-target-specific */
4138 extern int exception_support_initialized;
4139 /* Address of __eh_notify_hook */
4140 static CORE_ADDR eh_notify_hook_addr = 0;
4141 /* Address of __d_eh_notify_callback */
4142 static CORE_ADDR eh_notify_callback_addr = 0;
4143 /* Address of __d_eh_break */
4144 static CORE_ADDR eh_break_addr = 0;
4145 /* Address of __d_eh_catch_catch */
4146 static CORE_ADDR eh_catch_catch_addr = 0;
4147 /* Address of __d_eh_catch_throw */
4148 static CORE_ADDR eh_catch_throw_addr = 0;
4149 /* Sal for __d_eh_break */
4150 static struct symtab_and_line *break_callback_sal = 0;
4152 /* Code in end.c expects __d_pid to be set in the inferior,
4153 otherwise __d_eh_notify_callback doesn't bother to call
4154 __d_eh_break! So we poke the pid into this symbol
4159 setup_d_pid_in_inferior (void)
4162 struct minimal_symbol *msymbol;
4163 char buf[4]; /* FIXME 32x64? */
4165 /* Slam the pid of the process into __d_pid; failing is only a warning! */
4166 msymbol = lookup_minimal_symbol ("__d_pid", NULL, symfile_objfile);
4167 if (msymbol == NULL)
4169 warning ("Unable to find __d_pid symbol in object file.");
4170 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
4174 anaddr = SYMBOL_VALUE_ADDRESS (msymbol);
4175 store_unsigned_integer (buf, 4, PIDGET (inferior_ptid)); /* FIXME 32x64? */
4176 if (target_write_memory (anaddr, buf, 4)) /* FIXME 32x64? */
4178 warning ("Unable to write __d_pid");
4179 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
4185 /* Initialize exception catchpoint support by looking for the
4186 necessary hooks/callbacks in end.o, etc., and set the hook value to
4187 point to the required debug function
4193 initialize_hp_cxx_exception_support (void)
4195 struct symtabs_and_lines sals;
4196 struct cleanup *old_chain;
4197 struct cleanup *canonical_strings_chain = NULL;
4200 char *addr_end = NULL;
4201 char **canonical = (char **) NULL;
4203 struct symbol *sym = NULL;
4204 struct minimal_symbol *msym = NULL;
4205 struct objfile *objfile;
4206 asection *shlib_info;
4208 /* Detect and disallow recursion. On HP-UX with aCC, infinite
4209 recursion is a possibility because finding the hook for exception
4210 callbacks involves making a call in the inferior, which means
4211 re-inserting breakpoints which can re-invoke this code */
4213 static int recurse = 0;
4216 hp_cxx_exception_support_initialized = 0;
4217 exception_support_initialized = 0;
4221 hp_cxx_exception_support = 0;
4223 /* First check if we have seen any HP compiled objects; if not,
4224 it is very unlikely that HP's idiosyncratic callback mechanism
4225 for exception handling debug support will be available!
4226 This will percolate back up to breakpoint.c, where our callers
4227 will decide to try the g++ exception-handling support instead. */
4228 if (!hp_som_som_object_present)
4231 /* We have a SOM executable with SOM debug info; find the hooks */
4233 /* First look for the notify hook provided by aCC runtime libs */
4234 /* If we find this symbol, we conclude that the executable must
4235 have HP aCC exception support built in. If this symbol is not
4236 found, even though we're a HP SOM-SOM file, we may have been
4237 built with some other compiler (not aCC). This results percolates
4238 back up to our callers in breakpoint.c which can decide to
4239 try the g++ style of exception support instead.
4240 If this symbol is found but the other symbols we require are
4241 not found, there is something weird going on, and g++ support
4242 should *not* be tried as an alternative.
4244 ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined.
4245 ASSUMPTION: HP aCC and g++ modules cannot be linked together. */
4247 /* libCsup has this hook; it'll usually be non-debuggable */
4248 msym = lookup_minimal_symbol (HP_ACC_EH_notify_hook, NULL, NULL);
4251 eh_notify_hook_addr = SYMBOL_VALUE_ADDRESS (msym);
4252 hp_cxx_exception_support = 1;
4256 warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook);
4257 warning ("Executable may not have been compiled debuggable with HP aCC.");
4258 warning ("GDB will be unable to intercept exception events.");
4259 eh_notify_hook_addr = 0;
4260 hp_cxx_exception_support = 0;
4264 /* Next look for the notify callback routine in end.o */
4265 /* This is always available in the SOM symbol dictionary if end.o is linked in */
4266 msym = lookup_minimal_symbol (HP_ACC_EH_notify_callback, NULL, NULL);
4269 eh_notify_callback_addr = SYMBOL_VALUE_ADDRESS (msym);
4270 hp_cxx_exception_support = 1;
4274 warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback);
4275 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
4276 warning ("GDB will be unable to intercept exception events.");
4277 eh_notify_callback_addr = 0;
4281 #ifndef GDB_TARGET_IS_HPPA_20W
4282 /* Check whether the executable is dynamically linked or archive bound */
4283 /* With an archive-bound executable we can use the raw addresses we find
4284 for the callback function, etc. without modification. For an executable
4285 with shared libraries, we have to do more work to find the plabel, which
4286 can be the target of a call through $$dyncall from the aCC runtime support
4287 library (libCsup) which is linked shared by default by aCC. */
4288 /* This test below was copied from somsolib.c/somread.c. It may not be a very
4289 reliable one to test that an executable is linked shared. pai/1997-07-18 */
4290 shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, "$SHLIB_INFO$");
4291 if (shlib_info && (bfd_section_size (symfile_objfile->obfd, shlib_info) != 0))
4293 /* The minsym we have has the local code address, but that's not the
4294 plabel that can be used by an inter-load-module call. */
4295 /* Find solib handle for main image (which has end.o), and use that
4296 and the min sym as arguments to __d_shl_get() (which does the equivalent
4297 of shl_findsym()) to find the plabel. */
4299 args_for_find_stub args;
4300 static char message[] = "Error while finding exception callback hook:\n";
4302 args.solib_handle = som_solib_get_solib_by_pc (eh_notify_callback_addr);
4304 args.return_val = 0;
4307 catch_errors (cover_find_stub_with_shl_get, (PTR) &args, message,
4309 eh_notify_callback_addr = args.return_val;
4312 exception_catchpoints_are_fragile = 1;
4314 if (!eh_notify_callback_addr)
4316 /* We can get here either if there is no plabel in the export list
4317 for the main image, or if something strange happened (?) */
4318 warning ("Couldn't find a plabel (indirect function label) for the exception callback.");
4319 warning ("GDB will not be able to intercept exception events.");
4324 exception_catchpoints_are_fragile = 0;
4327 /* Now, look for the breakpointable routine in end.o */
4328 /* This should also be available in the SOM symbol dict. if end.o linked in */
4329 msym = lookup_minimal_symbol (HP_ACC_EH_break, NULL, NULL);
4332 eh_break_addr = SYMBOL_VALUE_ADDRESS (msym);
4333 hp_cxx_exception_support = 1;
4337 warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break);
4338 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
4339 warning ("GDB will be unable to intercept exception events.");
4344 /* Next look for the catch enable flag provided in end.o */
4345 sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL,
4346 VAR_NAMESPACE, 0, (struct symtab **) NULL);
4347 if (sym) /* sometimes present in debug info */
4349 eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (sym);
4350 hp_cxx_exception_support = 1;
4353 /* otherwise look in SOM symbol dict. */
4355 msym = lookup_minimal_symbol (HP_ACC_EH_catch_catch, NULL, NULL);
4358 eh_catch_catch_addr = SYMBOL_VALUE_ADDRESS (msym);
4359 hp_cxx_exception_support = 1;
4363 warning ("Unable to enable interception of exception catches.");
4364 warning ("Executable may not have been compiled debuggable with HP aCC.");
4365 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
4370 /* Next look for the catch enable flag provided end.o */
4371 sym = lookup_symbol (HP_ACC_EH_catch_catch, (struct block *) NULL,
4372 VAR_NAMESPACE, 0, (struct symtab **) NULL);
4373 if (sym) /* sometimes present in debug info */
4375 eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (sym);
4376 hp_cxx_exception_support = 1;
4379 /* otherwise look in SOM symbol dict. */
4381 msym = lookup_minimal_symbol (HP_ACC_EH_catch_throw, NULL, NULL);
4384 eh_catch_throw_addr = SYMBOL_VALUE_ADDRESS (msym);
4385 hp_cxx_exception_support = 1;
4389 warning ("Unable to enable interception of exception throws.");
4390 warning ("Executable may not have been compiled debuggable with HP aCC.");
4391 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
4397 hp_cxx_exception_support = 2; /* everything worked so far */
4398 hp_cxx_exception_support_initialized = 1;
4399 exception_support_initialized = 1;
4404 /* Target operation for enabling or disabling interception of
4406 KIND is either EX_EVENT_THROW or EX_EVENT_CATCH
4407 ENABLE is either 0 (disable) or 1 (enable).
4408 Return value is NULL if no support found;
4409 -1 if something went wrong,
4410 or a pointer to a symtab/line struct if the breakpointable
4411 address was found. */
4413 struct symtab_and_line *
4414 child_enable_exception_callback (enum exception_event_kind kind, int enable)
4418 if (!exception_support_initialized || !hp_cxx_exception_support_initialized)
4419 if (!initialize_hp_cxx_exception_support ())
4422 switch (hp_cxx_exception_support)
4425 /* Assuming no HP support at all */
4428 /* HP support should be present, but something went wrong */
4429 return (struct symtab_and_line *) -1; /* yuck! */
4430 /* there may be other cases in the future */
4433 /* Set the EH hook to point to the callback routine */
4434 store_unsigned_integer (buf, 4, enable ? eh_notify_callback_addr : 0); /* FIXME 32x64 problem */
4435 /* pai: (temp) FIXME should there be a pack operation first? */
4436 if (target_write_memory (eh_notify_hook_addr, buf, 4)) /* FIXME 32x64 problem */
4438 warning ("Could not write to target memory for exception event callback.");
4439 warning ("Interception of exception events may not work.");
4440 return (struct symtab_and_line *) -1;
4444 /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */
4445 if (PIDGET (inferior_ptid) > 0)
4447 if (setup_d_pid_in_inferior ())
4448 return (struct symtab_and_line *) -1;
4452 warning ("Internal error: Invalid inferior pid? Cannot intercept exception events.");
4453 return (struct symtab_and_line *) -1;
4459 case EX_EVENT_THROW:
4460 store_unsigned_integer (buf, 4, enable ? 1 : 0);
4461 if (target_write_memory (eh_catch_throw_addr, buf, 4)) /* FIXME 32x64? */
4463 warning ("Couldn't enable exception throw interception.");
4464 return (struct symtab_and_line *) -1;
4467 case EX_EVENT_CATCH:
4468 store_unsigned_integer (buf, 4, enable ? 1 : 0);
4469 if (target_write_memory (eh_catch_catch_addr, buf, 4)) /* FIXME 32x64? */
4471 warning ("Couldn't enable exception catch interception.");
4472 return (struct symtab_and_line *) -1;
4476 error ("Request to enable unknown or unsupported exception event.");
4479 /* Copy break address into new sal struct, malloc'ing if needed. */
4480 if (!break_callback_sal)
4482 break_callback_sal = (struct symtab_and_line *) xmalloc (sizeof (struct symtab_and_line));
4484 init_sal (break_callback_sal);
4485 break_callback_sal->symtab = NULL;
4486 break_callback_sal->pc = eh_break_addr;
4487 break_callback_sal->line = 0;
4488 break_callback_sal->end = eh_break_addr;
4490 return break_callback_sal;
4493 /* Record some information about the current exception event */
4494 static struct exception_event_record current_ex_event;
4495 /* Convenience struct */
4496 static struct symtab_and_line null_symtab_and_line =
4499 /* Report current exception event. Returns a pointer to a record
4500 that describes the kind of the event, where it was thrown from,
4501 and where it will be caught. More information may be reported
4503 struct exception_event_record *
4504 child_get_current_exception_event (void)
4506 CORE_ADDR event_kind;
4507 CORE_ADDR throw_addr;
4508 CORE_ADDR catch_addr;
4509 struct frame_info *fi, *curr_frame;
4512 curr_frame = get_current_frame ();
4514 return (struct exception_event_record *) NULL;
4516 /* Go up one frame to __d_eh_notify_callback, because at the
4517 point when this code is executed, there's garbage in the
4518 arguments of __d_eh_break. */
4519 fi = find_relative_frame (curr_frame, &level);
4521 return (struct exception_event_record *) NULL;
4525 /* Read in the arguments */
4526 /* __d_eh_notify_callback() is called with 3 arguments:
4527 1. event kind catch or throw
4528 2. the target address if known
4529 3. a flag -- not sure what this is. pai/1997-07-17 */
4530 event_kind = read_register (ARG0_REGNUM);
4531 catch_addr = read_register (ARG1_REGNUM);
4533 /* Now go down to a user frame */
4534 /* For a throw, __d_eh_break is called by
4535 __d_eh_notify_callback which is called by
4536 __notify_throw which is called
4538 For a catch, __d_eh_break is called by
4539 __d_eh_notify_callback which is called by
4540 <stackwalking stuff> which is called by
4541 __throw__<stuff> or __rethrow_<stuff> which is called
4543 /* FIXME: Don't use such magic numbers; search for the frames */
4544 level = (event_kind == EX_EVENT_THROW) ? 3 : 4;
4545 fi = find_relative_frame (curr_frame, &level);
4547 return (struct exception_event_record *) NULL;
4550 throw_addr = fi->pc;
4552 /* Go back to original (top) frame */
4553 select_frame (curr_frame);
4555 current_ex_event.kind = (enum exception_event_kind) event_kind;
4556 current_ex_event.throw_sal = find_pc_line (throw_addr, 1);
4557 current_ex_event.catch_sal = find_pc_line (catch_addr, 1);
4559 return ¤t_ex_event;
4563 unwind_command (char *exp, int from_tty)
4566 struct unwind_table_entry *u;
4568 /* If we have an expression, evaluate it and use it as the address. */
4570 if (exp != 0 && *exp != 0)
4571 address = parse_and_eval_address (exp);
4575 u = find_unwind_entry (address);
4579 printf_unfiltered ("Can't find unwind table entry for %s\n", exp);
4583 printf_unfiltered ("unwind_table_entry (0x%s):\n",
4584 paddr_nz (host_pointer_to_address (u)));
4586 printf_unfiltered ("\tregion_start = ");
4587 print_address (u->region_start, gdb_stdout);
4589 printf_unfiltered ("\n\tregion_end = ");
4590 print_address (u->region_end, gdb_stdout);
4592 #define pif(FLD) if (u->FLD) printf_unfiltered (" "#FLD);
4594 printf_unfiltered ("\n\tflags =");
4595 pif (Cannot_unwind);
4597 pif (Millicode_save_sr0);
4600 pif (Variable_Frame);
4601 pif (Separate_Package_Body);
4602 pif (Frame_Extension_Millicode);
4603 pif (Stack_Overflow_Check);
4604 pif (Two_Instruction_SP_Increment);
4608 pif (Save_MRP_in_frame);
4609 pif (extn_ptr_defined);
4610 pif (Cleanup_defined);
4611 pif (MPE_XL_interrupt_marker);
4612 pif (HP_UX_interrupt_marker);
4615 putchar_unfiltered ('\n');
4617 #define pin(FLD) printf_unfiltered ("\t"#FLD" = 0x%x\n", u->FLD);
4619 pin (Region_description);
4622 pin (Total_frame_size);
4625 #ifdef PREPARE_TO_PROCEED
4627 /* If the user has switched threads, and there is a breakpoint
4628 at the old thread's pc location, then switch to that thread
4629 and return TRUE, else return FALSE and don't do a thread
4630 switch (or rather, don't seem to have done a thread switch).
4632 Ptrace-based gdb will always return FALSE to the thread-switch
4633 query, and thus also to PREPARE_TO_PROCEED.
4635 The important thing is whether there is a BPT instruction,
4636 not how many user breakpoints there are. So we have to worry
4637 about things like these:
4641 o User hits bp, no switch -- NO
4643 o User hits bp, switches threads -- YES
4645 o User hits bp, deletes bp, switches threads -- NO
4647 o User hits bp, deletes one of two or more bps
4648 at that PC, user switches threads -- YES
4650 o Plus, since we're buffering events, the user may have hit a
4651 breakpoint, deleted the breakpoint and then gotten another
4652 hit on that same breakpoint on another thread which
4653 actually hit before the delete. (FIXME in breakpoint.c
4654 so that "dead" breakpoints are ignored?) -- NO
4656 For these reasons, we have to violate information hiding and
4657 call "breakpoint_here_p". If core gdb thinks there is a bpt
4658 here, that's what counts, as core gdb is the one which is
4659 putting the BPT instruction in and taking it out.
4661 Note that this implementation is potentially redundant now that
4662 default_prepare_to_proceed() has been added.
4664 FIXME This may not support switching threads after Ctrl-C
4665 correctly. The default implementation does support this. */
4667 hppa_prepare_to_proceed (void)
4670 pid_t current_thread;
4672 old_thread = hppa_switched_threads (PIDGET (inferior_ptid));
4673 if (old_thread != 0)
4675 /* Switched over from "old_thread". Try to do
4676 as little work as possible, 'cause mostly
4677 we're going to switch back. */
4679 CORE_ADDR old_pc = read_pc ();
4681 /* Yuk, shouldn't use global to specify current
4682 thread. But that's how gdb does it. */
4683 current_thread = PIDGET (inferior_ptid);
4684 inferior_ptid = pid_to_ptid (old_thread);
4686 new_pc = read_pc ();
4687 if (new_pc != old_pc /* If at same pc, no need */
4688 && breakpoint_here_p (new_pc))
4690 /* User hasn't deleted the BP.
4691 Return TRUE, finishing switch to "old_thread". */
4692 flush_cached_frames ();
4693 registers_changed ();
4695 printf ("---> PREPARE_TO_PROCEED (was %d, now %d)!\n",
4696 current_thread, PIDGET (inferior_ptid));
4702 /* Otherwise switch back to the user-chosen thread. */
4703 inferior_ptid = pid_to_ptid (current_thread);
4704 new_pc = read_pc (); /* Re-prime register cache */
4709 #endif /* PREPARE_TO_PROCEED */
4712 hppa_skip_permanent_breakpoint (void)
4714 /* To step over a breakpoint instruction on the PA takes some
4715 fiddling with the instruction address queue.
4717 When we stop at a breakpoint, the IA queue front (the instruction
4718 we're executing now) points at the breakpoint instruction, and
4719 the IA queue back (the next instruction to execute) points to
4720 whatever instruction we would execute after the breakpoint, if it
4721 were an ordinary instruction. This is the case even if the
4722 breakpoint is in the delay slot of a branch instruction.
4724 Clearly, to step past the breakpoint, we need to set the queue
4725 front to the back. But what do we put in the back? What
4726 instruction comes after that one? Because of the branch delay
4727 slot, the next insn is always at the back + 4. */
4728 write_register (PCOQ_HEAD_REGNUM, read_register (PCOQ_TAIL_REGNUM));
4729 write_register (PCSQ_HEAD_REGNUM, read_register (PCSQ_TAIL_REGNUM));
4731 write_register (PCOQ_TAIL_REGNUM, read_register (PCOQ_TAIL_REGNUM) + 4);
4732 /* We can leave the tail's space the same, since there's no jump. */
4735 /* Copy the function value from VALBUF into the proper location
4736 for a function return.
4738 Called only in the context of the "return" command. */
4741 hppa_store_return_value (struct type *type, char *valbuf)
4743 /* For software floating point, the return value goes into the
4744 integer registers. But we do not have any flag to key this on,
4745 so we always store the value into the integer registers.
4747 If its a float value, then we also store it into the floating
4749 deprecated_write_register_bytes (REGISTER_BYTE (28)
4750 + (TYPE_LENGTH (type) > 4
4751 ? (8 - TYPE_LENGTH (type))
4752 : (4 - TYPE_LENGTH (type))),
4753 valbuf, TYPE_LENGTH (type));
4754 if (! SOFT_FLOAT && TYPE_CODE (type) == TYPE_CODE_FLT)
4755 deprecated_write_register_bytes (REGISTER_BYTE (FP4_REGNUM),
4756 valbuf, TYPE_LENGTH (type));
4759 /* Copy the function's return value into VALBUF.
4761 This function is called only in the context of "target function calls",
4762 ie. when the debugger forces a function to be called in the child, and
4763 when the debugger forces a fucntion to return prematurely via the
4764 "return" command. */
4767 hppa_extract_return_value (struct type *type, char *regbuf, char *valbuf)
4769 if (! SOFT_FLOAT && TYPE_CODE (type) == TYPE_CODE_FLT)
4771 (char *)regbuf + REGISTER_BYTE (FP4_REGNUM),
4772 TYPE_LENGTH (type));
4776 + REGISTER_BYTE (28)
4777 + (TYPE_LENGTH (type) > 4
4778 ? (8 - TYPE_LENGTH (type))
4779 : (4 - TYPE_LENGTH (type)))),
4780 TYPE_LENGTH (type));
4784 hppa_reg_struct_has_addr (int gcc_p, struct type *type)
4786 /* On the PA, any pass-by-value structure > 8 bytes is actually passed
4787 via a pointer regardless of its type or the compiler used. */
4788 return (TYPE_LENGTH (type) > 8);
4792 hppa_inner_than (CORE_ADDR lhs, CORE_ADDR rhs)
4794 /* Stack grows upward */
4799 hppa_stack_align (CORE_ADDR sp)
4801 /* elz: adjust the quantity to the next highest value which is
4802 64-bit aligned. This is used in valops.c, when the sp is adjusted.
4803 On hppa the sp must always be kept 64-bit aligned */
4804 return ((sp % 8) ? (sp + 7) & -8 : sp);
4808 hppa_pc_requires_run_before_use (CORE_ADDR pc)
4810 /* Sometimes we may pluck out a minimal symbol that has a negative address.
4812 An example of this occurs when an a.out is linked against a foo.sl.
4813 The foo.sl defines a global bar(), and the a.out declares a signature
4814 for bar(). However, the a.out doesn't directly call bar(), but passes
4815 its address in another call.
4817 If you have this scenario and attempt to "break bar" before running,
4818 gdb will find a minimal symbol for bar() in the a.out. But that
4819 symbol's address will be negative. What this appears to denote is
4820 an index backwards from the base of the procedure linkage table (PLT)
4821 into the data linkage table (DLT), the end of which is contiguous
4822 with the start of the PLT. This is clearly not a valid address for
4823 us to set a breakpoint on.
4825 Note that one must be careful in how one checks for a negative address.
4826 0xc0000000 is a legitimate address of something in a shared text
4827 segment, for example. Since I don't know what the possible range
4828 is of these "really, truly negative" addresses that come from the
4829 minimal symbols, I'm resorting to the gross hack of checking the
4830 top byte of the address for all 1's. Sigh. */
4832 return (!target_has_stack && (pc & 0xFF000000));
4836 hppa_instruction_nullified (void)
4838 /* brobecker 2002/11/07: Couldn't we use a ULONGEST here? It would
4839 avoid the type cast. I'm leaving it as is for now as I'm doing
4840 semi-mechanical multiarching-related changes. */
4841 const int ipsw = (int) read_register (IPSW_REGNUM);
4842 const int flags = (int) read_register (FLAGS_REGNUM);
4844 return ((ipsw & 0x00200000) && !(flags & 0x2));
4848 hppa_register_raw_size (int reg_nr)
4850 /* All registers have the same size. */
4851 return REGISTER_SIZE;
4854 /* Index within the register vector of the first byte of the space i
4855 used for register REG_NR. */
4858 hppa_register_byte (int reg_nr)
4863 /* Return the GDB type object for the "standard" data type of data
4867 hppa_register_virtual_type (int reg_nr)
4869 if (reg_nr < FP4_REGNUM)
4870 return builtin_type_int;
4872 return builtin_type_float;
4875 /* Store the address of the place in which to copy the structure the
4876 subroutine will return. This is called from call_function. */
4879 hppa_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
4881 write_register (28, addr);
4885 hppa_extract_struct_value_address (char *regbuf)
4887 /* Extract from an array REGBUF containing the (raw) register state
4888 the address in which a function should return its structure value,
4889 as a CORE_ADDR (or an expression that can be used as one). */
4890 /* FIXME: brobecker 2002-12-26.
4891 The current implementation is historical, but we should eventually
4892 implement it in a more robust manner as it relies on the fact that
4893 the address size is equal to the size of an int* _on the host_...
4894 One possible implementation that crossed my mind is to use
4896 return (*(int *)(regbuf + REGISTER_BYTE (28)));
4899 /* Return True if REGNUM is not a register available to the user
4900 through ptrace(). */
4903 hppa_cannot_store_register (int regnum)
4906 || regnum == PCSQ_HEAD_REGNUM
4907 || (regnum >= PCSQ_TAIL_REGNUM && regnum < IPSW_REGNUM)
4908 || (regnum > IPSW_REGNUM && regnum < FP4_REGNUM));
4913 hppa_frame_args_address (struct frame_info *fi)
4919 hppa_frame_locals_address (struct frame_info *fi)
4925 hppa_frame_num_args (struct frame_info *frame)
4927 /* We can't tell how many args there are now that the C compiler delays
4933 hppa_smash_text_address (CORE_ADDR addr)
4935 /* The low two bits of the PC on the PA contain the privilege level.
4936 Some genius implementing a (non-GCC) compiler apparently decided
4937 this means that "addresses" in a text section therefore include a
4938 privilege level, and thus symbol tables should contain these bits.
4939 This seems like a bonehead thing to do--anyway, it seems to work
4940 for our purposes to just ignore those bits. */
4942 return (addr &= ~0x3);
4946 hppa_coerce_float_to_double (struct type *formal, struct type *actual)
4948 /* FIXME: For the pa, it appears that the debug info marks the
4949 parameters as floats regardless of whether the function is
4950 prototyped, but the actual values are passed as doubles for the
4951 non-prototyped case and floats for the prototyped case. Thus we
4952 choose to make the non-prototyped case work for C and break the
4953 prototyped case, since the non-prototyped case is probably much
4955 return (current_language -> la_language == language_c);
4958 static struct gdbarch *
4959 hppa_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
4961 struct gdbarch *gdbarch;
4962 enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
4964 /* Try to determine the ABI of the object we are loading. */
4966 if (info.abfd != NULL)
4968 osabi = gdbarch_lookup_osabi (info.abfd);
4969 if (osabi == GDB_OSABI_UNKNOWN)
4971 /* If it's a SOM file, assume it's HP/UX SOM. */
4972 if (bfd_get_flavour (info.abfd) == bfd_target_som_flavour)
4973 osabi = GDB_OSABI_HPUX_SOM;
4977 /* find a candidate among the list of pre-declared architectures. */
4978 arches = gdbarch_list_lookup_by_info (arches, &info);
4980 return (arches->gdbarch);
4982 /* If none found, then allocate and initialize one. */
4983 gdbarch = gdbarch_alloc (&info, NULL);
4985 /* Hook in ABI-specific overrides, if they have been registered. */
4986 gdbarch_init_osabi (info, gdbarch, osabi);
4988 set_gdbarch_reg_struct_has_addr (gdbarch, hppa_reg_struct_has_addr);
4989 set_gdbarch_function_start_offset (gdbarch, 0);
4990 set_gdbarch_skip_prologue (gdbarch, hppa_skip_prologue);
4991 set_gdbarch_skip_trampoline_code (gdbarch, hppa_skip_trampoline_code);
4992 set_gdbarch_in_solib_call_trampoline (gdbarch, hppa_in_solib_call_trampoline);
4993 set_gdbarch_in_solib_return_trampoline (gdbarch,
4994 hppa_in_solib_return_trampoline);
4995 set_gdbarch_saved_pc_after_call (gdbarch, hppa_saved_pc_after_call);
4996 set_gdbarch_inner_than (gdbarch, hppa_inner_than);
4997 set_gdbarch_stack_align (gdbarch, hppa_stack_align);
4998 set_gdbarch_extra_stack_alignment_needed (gdbarch, 0);
4999 set_gdbarch_decr_pc_after_break (gdbarch, 0);
5000 set_gdbarch_register_size (gdbarch, 4);
5001 set_gdbarch_num_regs (gdbarch, hppa_num_regs);
5002 set_gdbarch_fp_regnum (gdbarch, 3);
5003 set_gdbarch_sp_regnum (gdbarch, 30);
5004 set_gdbarch_fp0_regnum (gdbarch, 64);
5005 set_gdbarch_pc_regnum (gdbarch, PCOQ_HEAD_REGNUM);
5006 set_gdbarch_npc_regnum (gdbarch, PCOQ_TAIL_REGNUM);
5007 set_gdbarch_register_raw_size (gdbarch, hppa_register_raw_size);
5008 set_gdbarch_register_bytes (gdbarch, hppa_num_regs * 4);
5009 set_gdbarch_register_byte (gdbarch, hppa_register_byte);
5010 set_gdbarch_register_virtual_size (gdbarch, hppa_register_raw_size);
5011 set_gdbarch_max_register_raw_size (gdbarch, 4);
5012 set_gdbarch_max_register_virtual_size (gdbarch, 8);
5013 set_gdbarch_register_virtual_type (gdbarch, hppa_register_virtual_type);
5014 set_gdbarch_store_struct_return (gdbarch, hppa_store_struct_return);
5015 set_gdbarch_deprecated_extract_return_value (gdbarch,
5016 hppa_extract_return_value);
5017 set_gdbarch_use_struct_convention (gdbarch, hppa_use_struct_convention);
5018 set_gdbarch_deprecated_store_return_value (gdbarch, hppa_store_return_value);
5019 set_gdbarch_deprecated_extract_struct_value_address
5020 (gdbarch, hppa_extract_struct_value_address);
5021 set_gdbarch_cannot_store_register (gdbarch, hppa_cannot_store_register);
5022 set_gdbarch_init_extra_frame_info (gdbarch, hppa_init_extra_frame_info);
5023 set_gdbarch_frame_chain (gdbarch, hppa_frame_chain);
5024 set_gdbarch_frame_chain_valid (gdbarch, hppa_frame_chain_valid);
5025 set_gdbarch_frameless_function_invocation
5026 (gdbarch, hppa_frameless_function_invocation);
5027 set_gdbarch_frame_saved_pc (gdbarch, hppa_frame_saved_pc);
5028 set_gdbarch_frame_args_address (gdbarch, hppa_frame_args_address);
5029 set_gdbarch_frame_locals_address (gdbarch, hppa_frame_locals_address);
5030 set_gdbarch_frame_num_args (gdbarch, hppa_frame_num_args);
5031 set_gdbarch_frame_args_skip (gdbarch, 0);
5032 /* set_gdbarch_push_dummy_frame (gdbarch, hppa_push_dummy_frame); */
5033 set_gdbarch_pop_frame (gdbarch, hppa_pop_frame);
5034 set_gdbarch_call_dummy_length (gdbarch, INSTRUCTION_SIZE * 28);
5035 set_gdbarch_call_dummy_start_offset (gdbarch, 0);
5036 /* set_gdbarch_fix_call_dummy (gdbarch, hppa_fix_call_dummy); */
5037 set_gdbarch_push_arguments (gdbarch, hppa_push_arguments);
5038 set_gdbarch_smash_text_address (gdbarch, hppa_smash_text_address);
5039 set_gdbarch_believe_pcc_promotion (gdbarch, 1);
5040 set_gdbarch_read_pc (gdbarch, hppa_target_read_pc);
5041 set_gdbarch_write_pc (gdbarch, hppa_target_write_pc);
5042 set_gdbarch_read_fp (gdbarch, hppa_target_read_fp);
5043 set_gdbarch_coerce_float_to_double (gdbarch, hppa_coerce_float_to_double);
5049 hppa_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
5051 /* Nothing to print for the moment. */
5055 _initialize_hppa_tdep (void)
5057 struct cmd_list_element *c;
5058 void break_at_finish_command (char *arg, int from_tty);
5059 void tbreak_at_finish_command (char *arg, int from_tty);
5060 void break_at_finish_at_depth_command (char *arg, int from_tty);
5062 gdbarch_register (bfd_arch_hppa, hppa_gdbarch_init, hppa_dump_tdep);
5063 tm_print_insn = print_insn_hppa;
5065 add_cmd ("unwind", class_maintenance, unwind_command,
5066 "Print unwind table entry at given address.",
5067 &maintenanceprintlist);
5069 deprecate_cmd (add_com ("xbreak", class_breakpoint,
5070 break_at_finish_command,
5071 concat ("Set breakpoint at procedure exit. \n\
5072 Argument may be function name, or \"*\" and an address.\n\
5073 If function is specified, break at end of code for that function.\n\
5074 If an address is specified, break at the end of the function that contains \n\
5075 that exact address.\n",
5076 "With no arg, uses current execution address of selected stack frame.\n\
5077 This is useful for breaking on return to a stack frame.\n\
5079 Multiple breakpoints at one place are permitted, and useful if conditional.\n\
5081 Do \"help breakpoints\" for info on other commands dealing with breakpoints.", NULL)), NULL);
5082 deprecate_cmd (add_com_alias ("xb", "xbreak", class_breakpoint, 1), NULL);
5083 deprecate_cmd (add_com_alias ("xbr", "xbreak", class_breakpoint, 1), NULL);
5084 deprecate_cmd (add_com_alias ("xbre", "xbreak", class_breakpoint, 1), NULL);
5085 deprecate_cmd (add_com_alias ("xbrea", "xbreak", class_breakpoint, 1), NULL);
5087 deprecate_cmd (c = add_com ("txbreak", class_breakpoint,
5088 tbreak_at_finish_command,
5089 "Set temporary breakpoint at procedure exit. Either there should\n\
5090 be no argument or the argument must be a depth.\n"), NULL);
5091 set_cmd_completer (c, location_completer);
5094 deprecate_cmd (add_com ("bx", class_breakpoint,
5095 break_at_finish_at_depth_command,
5096 "Set breakpoint at procedure exit. Either there should\n\
5097 be no argument or the argument must be a depth.\n"), NULL);