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"
35 /* For argument passing to the inferior */
39 #include <sys/types.h>
43 #include <sys/param.h>
46 #include <sys/ptrace.h>
47 #include <machine/save_state.h>
49 #ifdef COFF_ENCAPSULATE
50 #include "a.out.encap.h"
54 /*#include <sys/user.h> After a.out.h */
65 /* To support detection of the pseudo-initial frame
67 #define THREAD_INITIAL_FRAME_SYMBOL "__pthread_exit"
68 #define THREAD_INITIAL_FRAME_SYM_LEN sizeof(THREAD_INITIAL_FRAME_SYMBOL)
70 static int extract_5_load (unsigned int);
72 static unsigned extract_5R_store (unsigned int);
74 static unsigned extract_5r_store (unsigned int);
76 static void find_dummy_frame_regs (struct frame_info
*,
77 struct frame_saved_regs
*);
79 static int find_proc_framesize (CORE_ADDR
);
81 static int find_return_regnum (CORE_ADDR
);
83 struct unwind_table_entry
*find_unwind_entry (CORE_ADDR
);
85 static int extract_17 (unsigned int);
87 static unsigned deposit_21 (unsigned int, unsigned int);
89 static int extract_21 (unsigned);
91 static unsigned deposit_14 (int, unsigned int);
93 static int extract_14 (unsigned);
95 static void unwind_command (char *, int);
97 static int low_sign_extend (unsigned int, unsigned int);
99 static int sign_extend (unsigned int, unsigned int);
101 static int restore_pc_queue (struct frame_saved_regs
*);
103 static int hppa_alignof (struct type
*);
105 /* To support multi-threading and stepping. */
106 int hppa_prepare_to_proceed ();
108 static int prologue_inst_adjust_sp (unsigned long);
110 static int is_branch (unsigned long);
112 static int inst_saves_gr (unsigned long);
114 static int inst_saves_fr (unsigned long);
116 static int pc_in_interrupt_handler (CORE_ADDR
);
118 static int pc_in_linker_stub (CORE_ADDR
);
120 static int compare_unwind_entries (const void *, const void *);
122 static void read_unwind_info (struct objfile
*);
124 static void internalize_unwinds (struct objfile
*,
125 struct unwind_table_entry
*,
126 asection
*, unsigned int,
127 unsigned int, CORE_ADDR
);
128 static void pa_print_registers (char *, int, int);
129 static void pa_strcat_registers (char *, int, int, struct ui_file
*);
130 static void pa_register_look_aside (char *, int, long *);
131 static void pa_print_fp_reg (int);
132 static void pa_strcat_fp_reg (int, struct ui_file
*, enum precision_type
);
133 static void record_text_segment_lowaddr (bfd
*, asection
*, void *);
134 /* FIXME: brobecker 2002-11-07: We will likely be able to make the
135 following functions static, once we hppa is partially multiarched. */
136 int hppa_reg_struct_has_addr (int gcc_p
, struct type
*type
);
137 int hppa_inner_than (CORE_ADDR lhs
, CORE_ADDR rhs
);
138 CORE_ADDR
hppa_stack_align (CORE_ADDR sp
);
139 int hppa_pc_requires_run_before_use (CORE_ADDR pc
);
140 int hppa_instruction_nullified (void);
141 int hppa_register_byte (int reg_nr
);
142 struct type
* hppa_register_virtual_type (int reg_nr
);
143 void hppa_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
);
144 int hppa_cannot_store_register (int regnum
);
145 CORE_ADDR
hppa_frame_args_address (struct frame_info
*fi
);
146 CORE_ADDR
hppa_frame_locals_address (struct frame_info
*fi
);
147 CORE_ADDR
hppa_smash_text_address (CORE_ADDR addr
);
148 int hppa_coerce_float_to_double (struct type
*formal
, struct type
*actual
);
152 struct minimal_symbol
*msym
;
153 CORE_ADDR solib_handle
;
154 CORE_ADDR return_val
;
158 static int cover_find_stub_with_shl_get (PTR
);
160 static int is_pa_2
= 0; /* False */
162 /* This is declared in symtab.c; set to 1 in hp-symtab-read.c */
163 extern int hp_som_som_object_present
;
165 /* In breakpoint.c */
166 extern int exception_catchpoints_are_fragile
;
168 /* Should call_function allocate stack space for a struct return? */
171 hppa_use_struct_convention (int gcc_p
, struct type
*type
)
173 return (TYPE_LENGTH (type
) > 2 * REGISTER_SIZE
);
177 /* Routines to extract various sized constants out of hppa
180 /* This assumes that no garbage lies outside of the lower bits of
184 sign_extend (unsigned val
, unsigned bits
)
186 return (int) (val
>> (bits
- 1) ? (-1 << bits
) | val
: val
);
189 /* For many immediate values the sign bit is the low bit! */
192 low_sign_extend (unsigned val
, unsigned bits
)
194 return (int) ((val
& 0x1 ? (-1 << (bits
- 1)) : 0) | val
>> 1);
197 /* extract the immediate field from a ld{bhw}s instruction */
200 extract_5_load (unsigned word
)
202 return low_sign_extend (word
>> 16 & MASK_5
, 5);
205 /* extract the immediate field from a break instruction */
208 extract_5r_store (unsigned word
)
210 return (word
& MASK_5
);
213 /* extract the immediate field from a {sr}sm instruction */
216 extract_5R_store (unsigned word
)
218 return (word
>> 16 & MASK_5
);
221 /* extract a 14 bit immediate field */
224 extract_14 (unsigned word
)
226 return low_sign_extend (word
& MASK_14
, 14);
229 /* deposit a 14 bit constant in a word */
232 deposit_14 (int opnd
, unsigned word
)
234 unsigned sign
= (opnd
< 0 ? 1 : 0);
236 return word
| ((unsigned) opnd
<< 1 & MASK_14
) | sign
;
239 /* extract a 21 bit constant */
242 extract_21 (unsigned word
)
248 val
= GET_FIELD (word
, 20, 20);
250 val
|= GET_FIELD (word
, 9, 19);
252 val
|= GET_FIELD (word
, 5, 6);
254 val
|= GET_FIELD (word
, 0, 4);
256 val
|= GET_FIELD (word
, 7, 8);
257 return sign_extend (val
, 21) << 11;
260 /* deposit a 21 bit constant in a word. Although 21 bit constants are
261 usually the top 21 bits of a 32 bit constant, we assume that only
262 the low 21 bits of opnd are relevant */
265 deposit_21 (unsigned opnd
, unsigned word
)
269 val
|= GET_FIELD (opnd
, 11 + 14, 11 + 18);
271 val
|= GET_FIELD (opnd
, 11 + 12, 11 + 13);
273 val
|= GET_FIELD (opnd
, 11 + 19, 11 + 20);
275 val
|= GET_FIELD (opnd
, 11 + 1, 11 + 11);
277 val
|= GET_FIELD (opnd
, 11 + 0, 11 + 0);
281 /* extract a 17 bit constant from branch instructions, returning the
282 19 bit signed value. */
285 extract_17 (unsigned word
)
287 return sign_extend (GET_FIELD (word
, 19, 28) |
288 GET_FIELD (word
, 29, 29) << 10 |
289 GET_FIELD (word
, 11, 15) << 11 |
290 (word
& 0x1) << 16, 17) << 2;
294 /* Compare the start address for two unwind entries returning 1 if
295 the first address is larger than the second, -1 if the second is
296 larger than the first, and zero if they are equal. */
299 compare_unwind_entries (const void *arg1
, const void *arg2
)
301 const struct unwind_table_entry
*a
= arg1
;
302 const struct unwind_table_entry
*b
= arg2
;
304 if (a
->region_start
> b
->region_start
)
306 else if (a
->region_start
< b
->region_start
)
312 static CORE_ADDR low_text_segment_address
;
315 record_text_segment_lowaddr (bfd
*abfd
, asection
*section
, void *ignored
)
317 if (((section
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
))
318 == (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
))
319 && section
->vma
< low_text_segment_address
)
320 low_text_segment_address
= section
->vma
;
324 internalize_unwinds (struct objfile
*objfile
, struct unwind_table_entry
*table
,
325 asection
*section
, unsigned int entries
, unsigned int size
,
326 CORE_ADDR text_offset
)
328 /* We will read the unwind entries into temporary memory, then
329 fill in the actual unwind table. */
334 char *buf
= alloca (size
);
336 low_text_segment_address
= -1;
338 /* If addresses are 64 bits wide, then unwinds are supposed to
339 be segment relative offsets instead of absolute addresses.
341 Note that when loading a shared library (text_offset != 0) the
342 unwinds are already relative to the text_offset that will be
344 if (TARGET_PTR_BIT
== 64 && text_offset
== 0)
346 bfd_map_over_sections (objfile
->obfd
,
347 record_text_segment_lowaddr
, (PTR
) NULL
);
349 /* ?!? Mask off some low bits. Should this instead subtract
350 out the lowest section's filepos or something like that?
351 This looks very hokey to me. */
352 low_text_segment_address
&= ~0xfff;
353 text_offset
+= low_text_segment_address
;
356 bfd_get_section_contents (objfile
->obfd
, section
, buf
, 0, size
);
358 /* Now internalize the information being careful to handle host/target
360 for (i
= 0; i
< entries
; i
++)
362 table
[i
].region_start
= bfd_get_32 (objfile
->obfd
,
364 table
[i
].region_start
+= text_offset
;
366 table
[i
].region_end
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) buf
);
367 table
[i
].region_end
+= text_offset
;
369 tmp
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) buf
);
371 table
[i
].Cannot_unwind
= (tmp
>> 31) & 0x1;
372 table
[i
].Millicode
= (tmp
>> 30) & 0x1;
373 table
[i
].Millicode_save_sr0
= (tmp
>> 29) & 0x1;
374 table
[i
].Region_description
= (tmp
>> 27) & 0x3;
375 table
[i
].reserved1
= (tmp
>> 26) & 0x1;
376 table
[i
].Entry_SR
= (tmp
>> 25) & 0x1;
377 table
[i
].Entry_FR
= (tmp
>> 21) & 0xf;
378 table
[i
].Entry_GR
= (tmp
>> 16) & 0x1f;
379 table
[i
].Args_stored
= (tmp
>> 15) & 0x1;
380 table
[i
].Variable_Frame
= (tmp
>> 14) & 0x1;
381 table
[i
].Separate_Package_Body
= (tmp
>> 13) & 0x1;
382 table
[i
].Frame_Extension_Millicode
= (tmp
>> 12) & 0x1;
383 table
[i
].Stack_Overflow_Check
= (tmp
>> 11) & 0x1;
384 table
[i
].Two_Instruction_SP_Increment
= (tmp
>> 10) & 0x1;
385 table
[i
].Ada_Region
= (tmp
>> 9) & 0x1;
386 table
[i
].cxx_info
= (tmp
>> 8) & 0x1;
387 table
[i
].cxx_try_catch
= (tmp
>> 7) & 0x1;
388 table
[i
].sched_entry_seq
= (tmp
>> 6) & 0x1;
389 table
[i
].reserved2
= (tmp
>> 5) & 0x1;
390 table
[i
].Save_SP
= (tmp
>> 4) & 0x1;
391 table
[i
].Save_RP
= (tmp
>> 3) & 0x1;
392 table
[i
].Save_MRP_in_frame
= (tmp
>> 2) & 0x1;
393 table
[i
].extn_ptr_defined
= (tmp
>> 1) & 0x1;
394 table
[i
].Cleanup_defined
= tmp
& 0x1;
395 tmp
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) buf
);
397 table
[i
].MPE_XL_interrupt_marker
= (tmp
>> 31) & 0x1;
398 table
[i
].HP_UX_interrupt_marker
= (tmp
>> 30) & 0x1;
399 table
[i
].Large_frame
= (tmp
>> 29) & 0x1;
400 table
[i
].Pseudo_SP_Set
= (tmp
>> 28) & 0x1;
401 table
[i
].reserved4
= (tmp
>> 27) & 0x1;
402 table
[i
].Total_frame_size
= tmp
& 0x7ffffff;
404 /* Stub unwinds are handled elsewhere. */
405 table
[i
].stub_unwind
.stub_type
= 0;
406 table
[i
].stub_unwind
.padding
= 0;
411 /* Read in the backtrace information stored in the `$UNWIND_START$' section of
412 the object file. This info is used mainly by find_unwind_entry() to find
413 out the stack frame size and frame pointer used by procedures. We put
414 everything on the psymbol obstack in the objfile so that it automatically
415 gets freed when the objfile is destroyed. */
418 read_unwind_info (struct objfile
*objfile
)
420 asection
*unwind_sec
, *stub_unwind_sec
;
421 unsigned unwind_size
, stub_unwind_size
, total_size
;
422 unsigned index
, unwind_entries
;
423 unsigned stub_entries
, total_entries
;
424 CORE_ADDR text_offset
;
425 struct obj_unwind_info
*ui
;
426 obj_private_data_t
*obj_private
;
428 text_offset
= ANOFFSET (objfile
->section_offsets
, 0);
429 ui
= (struct obj_unwind_info
*) obstack_alloc (&objfile
->psymbol_obstack
,
430 sizeof (struct obj_unwind_info
));
436 /* For reasons unknown the HP PA64 tools generate multiple unwinder
437 sections in a single executable. So we just iterate over every
438 section in the BFD looking for unwinder sections intead of trying
439 to do a lookup with bfd_get_section_by_name.
441 First determine the total size of the unwind tables so that we
442 can allocate memory in a nice big hunk. */
444 for (unwind_sec
= objfile
->obfd
->sections
;
446 unwind_sec
= unwind_sec
->next
)
448 if (strcmp (unwind_sec
->name
, "$UNWIND_START$") == 0
449 || strcmp (unwind_sec
->name
, ".PARISC.unwind") == 0)
451 unwind_size
= bfd_section_size (objfile
->obfd
, unwind_sec
);
452 unwind_entries
= unwind_size
/ UNWIND_ENTRY_SIZE
;
454 total_entries
+= unwind_entries
;
458 /* Now compute the size of the stub unwinds. Note the ELF tools do not
459 use stub unwinds at the curren time. */
460 stub_unwind_sec
= bfd_get_section_by_name (objfile
->obfd
, "$UNWIND_END$");
464 stub_unwind_size
= bfd_section_size (objfile
->obfd
, stub_unwind_sec
);
465 stub_entries
= stub_unwind_size
/ STUB_UNWIND_ENTRY_SIZE
;
469 stub_unwind_size
= 0;
473 /* Compute total number of unwind entries and their total size. */
474 total_entries
+= stub_entries
;
475 total_size
= total_entries
* sizeof (struct unwind_table_entry
);
477 /* Allocate memory for the unwind table. */
478 ui
->table
= (struct unwind_table_entry
*)
479 obstack_alloc (&objfile
->psymbol_obstack
, total_size
);
480 ui
->last
= total_entries
- 1;
482 /* Now read in each unwind section and internalize the standard unwind
485 for (unwind_sec
= objfile
->obfd
->sections
;
487 unwind_sec
= unwind_sec
->next
)
489 if (strcmp (unwind_sec
->name
, "$UNWIND_START$") == 0
490 || strcmp (unwind_sec
->name
, ".PARISC.unwind") == 0)
492 unwind_size
= bfd_section_size (objfile
->obfd
, unwind_sec
);
493 unwind_entries
= unwind_size
/ UNWIND_ENTRY_SIZE
;
495 internalize_unwinds (objfile
, &ui
->table
[index
], unwind_sec
,
496 unwind_entries
, unwind_size
, text_offset
);
497 index
+= unwind_entries
;
501 /* Now read in and internalize the stub unwind entries. */
502 if (stub_unwind_size
> 0)
505 char *buf
= alloca (stub_unwind_size
);
507 /* Read in the stub unwind entries. */
508 bfd_get_section_contents (objfile
->obfd
, stub_unwind_sec
, buf
,
509 0, stub_unwind_size
);
511 /* Now convert them into regular unwind entries. */
512 for (i
= 0; i
< stub_entries
; i
++, index
++)
514 /* Clear out the next unwind entry. */
515 memset (&ui
->table
[index
], 0, sizeof (struct unwind_table_entry
));
517 /* Convert offset & size into region_start and region_end.
518 Stuff away the stub type into "reserved" fields. */
519 ui
->table
[index
].region_start
= bfd_get_32 (objfile
->obfd
,
521 ui
->table
[index
].region_start
+= text_offset
;
523 ui
->table
[index
].stub_unwind
.stub_type
= bfd_get_8 (objfile
->obfd
,
526 ui
->table
[index
].region_end
527 = ui
->table
[index
].region_start
+ 4 *
528 (bfd_get_16 (objfile
->obfd
, (bfd_byte
*) buf
) - 1);
534 /* Unwind table needs to be kept sorted. */
535 qsort (ui
->table
, total_entries
, sizeof (struct unwind_table_entry
),
536 compare_unwind_entries
);
538 /* Keep a pointer to the unwind information. */
539 if (objfile
->obj_private
== NULL
)
541 obj_private
= (obj_private_data_t
*)
542 obstack_alloc (&objfile
->psymbol_obstack
,
543 sizeof (obj_private_data_t
));
544 obj_private
->unwind_info
= NULL
;
545 obj_private
->so_info
= NULL
;
548 objfile
->obj_private
= (PTR
) obj_private
;
550 obj_private
= (obj_private_data_t
*) objfile
->obj_private
;
551 obj_private
->unwind_info
= ui
;
554 /* Lookup the unwind (stack backtrace) info for the given PC. We search all
555 of the objfiles seeking the unwind table entry for this PC. Each objfile
556 contains a sorted list of struct unwind_table_entry. Since we do a binary
557 search of the unwind tables, we depend upon them to be sorted. */
559 struct unwind_table_entry
*
560 find_unwind_entry (CORE_ADDR pc
)
562 int first
, middle
, last
;
563 struct objfile
*objfile
;
565 /* A function at address 0? Not in HP-UX! */
566 if (pc
== (CORE_ADDR
) 0)
569 ALL_OBJFILES (objfile
)
571 struct obj_unwind_info
*ui
;
573 if (objfile
->obj_private
)
574 ui
= ((obj_private_data_t
*) (objfile
->obj_private
))->unwind_info
;
578 read_unwind_info (objfile
);
579 if (objfile
->obj_private
== NULL
)
580 error ("Internal error reading unwind information.");
581 ui
= ((obj_private_data_t
*) (objfile
->obj_private
))->unwind_info
;
584 /* First, check the cache */
587 && pc
>= ui
->cache
->region_start
588 && pc
<= ui
->cache
->region_end
)
591 /* Not in the cache, do a binary search */
596 while (first
<= last
)
598 middle
= (first
+ last
) / 2;
599 if (pc
>= ui
->table
[middle
].region_start
600 && pc
<= ui
->table
[middle
].region_end
)
602 ui
->cache
= &ui
->table
[middle
];
603 return &ui
->table
[middle
];
606 if (pc
< ui
->table
[middle
].region_start
)
611 } /* ALL_OBJFILES() */
615 /* Return the adjustment necessary to make for addresses on the stack
616 as presented by hpread.c.
618 This is necessary because of the stack direction on the PA and the
619 bizarre way in which someone (?) decided they wanted to handle
620 frame pointerless code in GDB. */
622 hpread_adjust_stack_address (CORE_ADDR func_addr
)
624 struct unwind_table_entry
*u
;
626 u
= find_unwind_entry (func_addr
);
630 return u
->Total_frame_size
<< 3;
633 /* Called to determine if PC is in an interrupt handler of some
637 pc_in_interrupt_handler (CORE_ADDR pc
)
639 struct unwind_table_entry
*u
;
640 struct minimal_symbol
*msym_us
;
642 u
= find_unwind_entry (pc
);
646 /* Oh joys. HPUX sets the interrupt bit for _sigreturn even though
647 its frame isn't a pure interrupt frame. Deal with this. */
648 msym_us
= lookup_minimal_symbol_by_pc (pc
);
650 return (u
->HP_UX_interrupt_marker
651 && !PC_IN_SIGTRAMP (pc
, SYMBOL_NAME (msym_us
)));
654 /* Called when no unwind descriptor was found for PC. Returns 1 if it
655 appears that PC is in a linker stub.
657 ?!? Need to handle stubs which appear in PA64 code. */
660 pc_in_linker_stub (CORE_ADDR pc
)
662 int found_magic_instruction
= 0;
666 /* If unable to read memory, assume pc is not in a linker stub. */
667 if (target_read_memory (pc
, buf
, 4) != 0)
670 /* We are looking for something like
672 ; $$dyncall jams RP into this special spot in the frame (RP')
673 ; before calling the "call stub"
676 ldsid (rp),r1 ; Get space associated with RP into r1
677 mtsp r1,sp ; Move it into space register 0
678 be,n 0(sr0),rp) ; back to your regularly scheduled program */
680 /* Maximum known linker stub size is 4 instructions. Search forward
681 from the given PC, then backward. */
682 for (i
= 0; i
< 4; i
++)
684 /* If we hit something with an unwind, stop searching this direction. */
686 if (find_unwind_entry (pc
+ i
* 4) != 0)
689 /* Check for ldsid (rp),r1 which is the magic instruction for a
690 return from a cross-space function call. */
691 if (read_memory_integer (pc
+ i
* 4, 4) == 0x004010a1)
693 found_magic_instruction
= 1;
696 /* Add code to handle long call/branch and argument relocation stubs
700 if (found_magic_instruction
!= 0)
703 /* Now look backward. */
704 for (i
= 0; i
< 4; i
++)
706 /* If we hit something with an unwind, stop searching this direction. */
708 if (find_unwind_entry (pc
- i
* 4) != 0)
711 /* Check for ldsid (rp),r1 which is the magic instruction for a
712 return from a cross-space function call. */
713 if (read_memory_integer (pc
- i
* 4, 4) == 0x004010a1)
715 found_magic_instruction
= 1;
718 /* Add code to handle long call/branch and argument relocation stubs
721 return found_magic_instruction
;
725 find_return_regnum (CORE_ADDR pc
)
727 struct unwind_table_entry
*u
;
729 u
= find_unwind_entry (pc
);
740 /* Return size of frame, or -1 if we should use a frame pointer. */
742 find_proc_framesize (CORE_ADDR pc
)
744 struct unwind_table_entry
*u
;
745 struct minimal_symbol
*msym_us
;
747 /* This may indicate a bug in our callers... */
748 if (pc
== (CORE_ADDR
) 0)
751 u
= find_unwind_entry (pc
);
755 if (pc_in_linker_stub (pc
))
756 /* Linker stubs have a zero size frame. */
762 msym_us
= lookup_minimal_symbol_by_pc (pc
);
764 /* If Save_SP is set, and we're not in an interrupt or signal caller,
765 then we have a frame pointer. Use it. */
767 && !pc_in_interrupt_handler (pc
)
769 && !PC_IN_SIGTRAMP (pc
, SYMBOL_NAME (msym_us
)))
772 return u
->Total_frame_size
<< 3;
775 /* Return offset from sp at which rp is saved, or 0 if not saved. */
776 static int rp_saved (CORE_ADDR
);
779 rp_saved (CORE_ADDR pc
)
781 struct unwind_table_entry
*u
;
783 /* A function at, and thus a return PC from, address 0? Not in HP-UX! */
784 if (pc
== (CORE_ADDR
) 0)
787 u
= find_unwind_entry (pc
);
791 if (pc_in_linker_stub (pc
))
792 /* This is the so-called RP'. */
799 return (TARGET_PTR_BIT
== 64 ? -16 : -20);
800 else if (u
->stub_unwind
.stub_type
!= 0)
802 switch (u
->stub_unwind
.stub_type
)
807 case PARAMETER_RELOCATION
:
818 frameless_function_invocation (struct frame_info
*frame
)
820 struct unwind_table_entry
*u
;
822 u
= find_unwind_entry (frame
->pc
);
827 return (u
->Total_frame_size
== 0 && u
->stub_unwind
.stub_type
== 0);
830 /* Immediately after a function call, return the saved pc.
831 Can't go through the frames for this because on some machines
832 the new frame is not set up until the new function executes
833 some instructions. */
836 saved_pc_after_call (struct frame_info
*frame
)
840 struct unwind_table_entry
*u
;
842 ret_regnum
= find_return_regnum (get_frame_pc (frame
));
843 pc
= read_register (ret_regnum
) & ~0x3;
845 /* If PC is in a linker stub, then we need to dig the address
846 the stub will return to out of the stack. */
847 u
= find_unwind_entry (pc
);
848 if (u
&& u
->stub_unwind
.stub_type
!= 0)
849 return FRAME_SAVED_PC (frame
);
855 hppa_frame_saved_pc (struct frame_info
*frame
)
857 CORE_ADDR pc
= get_frame_pc (frame
);
858 struct unwind_table_entry
*u
;
860 int spun_around_loop
= 0;
863 /* BSD, HPUX & OSF1 all lay out the hardware state in the same manner
864 at the base of the frame in an interrupt handler. Registers within
865 are saved in the exact same order as GDB numbers registers. How
867 if (pc_in_interrupt_handler (pc
))
868 return read_memory_integer (frame
->frame
+ PC_REGNUM
* 4,
869 TARGET_PTR_BIT
/ 8) & ~0x3;
871 if ((frame
->pc
>= frame
->frame
872 && frame
->pc
<= (frame
->frame
873 /* A call dummy is sized in words, but it is
874 actually a series of instructions. Account
875 for that scaling factor. */
876 + ((REGISTER_SIZE
/ INSTRUCTION_SIZE
)
878 /* Similarly we have to account for 64bit
879 wide register saves. */
880 + (32 * REGISTER_SIZE
)
881 /* We always consider FP regs 8 bytes long. */
882 + (NUM_REGS
- FP0_REGNUM
) * 8
883 /* Similarly we have to account for 64bit
884 wide register saves. */
885 + (6 * REGISTER_SIZE
))))
887 return read_memory_integer ((frame
->frame
888 + (TARGET_PTR_BIT
== 64 ? -16 : -20)),
889 TARGET_PTR_BIT
/ 8) & ~0x3;
892 #ifdef FRAME_SAVED_PC_IN_SIGTRAMP
893 /* Deal with signal handler caller frames too. */
894 if (frame
->signal_handler_caller
)
897 FRAME_SAVED_PC_IN_SIGTRAMP (frame
, &rp
);
902 if (frameless_function_invocation (frame
))
906 ret_regnum
= find_return_regnum (pc
);
908 /* If the next frame is an interrupt frame or a signal
909 handler caller, then we need to look in the saved
910 register area to get the return pointer (the values
911 in the registers may not correspond to anything useful). */
913 && (frame
->next
->signal_handler_caller
914 || pc_in_interrupt_handler (frame
->next
->pc
)))
916 struct frame_saved_regs saved_regs
;
918 get_frame_saved_regs (frame
->next
, &saved_regs
);
919 if (read_memory_integer (saved_regs
.regs
[FLAGS_REGNUM
],
920 TARGET_PTR_BIT
/ 8) & 0x2)
922 pc
= read_memory_integer (saved_regs
.regs
[31],
923 TARGET_PTR_BIT
/ 8) & ~0x3;
925 /* Syscalls are really two frames. The syscall stub itself
926 with a return pointer in %rp and the kernel call with
927 a return pointer in %r31. We return the %rp variant
928 if %r31 is the same as frame->pc. */
930 pc
= read_memory_integer (saved_regs
.regs
[RP_REGNUM
],
931 TARGET_PTR_BIT
/ 8) & ~0x3;
934 pc
= read_memory_integer (saved_regs
.regs
[RP_REGNUM
],
935 TARGET_PTR_BIT
/ 8) & ~0x3;
938 pc
= read_register (ret_regnum
) & ~0x3;
942 spun_around_loop
= 0;
946 rp_offset
= rp_saved (pc
);
948 /* Similar to code in frameless function case. If the next
949 frame is a signal or interrupt handler, then dig the right
950 information out of the saved register info. */
953 && (frame
->next
->signal_handler_caller
954 || pc_in_interrupt_handler (frame
->next
->pc
)))
956 struct frame_saved_regs saved_regs
;
958 get_frame_saved_regs (frame
->next
, &saved_regs
);
959 if (read_memory_integer (saved_regs
.regs
[FLAGS_REGNUM
],
960 TARGET_PTR_BIT
/ 8) & 0x2)
962 pc
= read_memory_integer (saved_regs
.regs
[31],
963 TARGET_PTR_BIT
/ 8) & ~0x3;
965 /* Syscalls are really two frames. The syscall stub itself
966 with a return pointer in %rp and the kernel call with
967 a return pointer in %r31. We return the %rp variant
968 if %r31 is the same as frame->pc. */
970 pc
= read_memory_integer (saved_regs
.regs
[RP_REGNUM
],
971 TARGET_PTR_BIT
/ 8) & ~0x3;
974 pc
= read_memory_integer (saved_regs
.regs
[RP_REGNUM
],
975 TARGET_PTR_BIT
/ 8) & ~0x3;
977 else if (rp_offset
== 0)
980 pc
= read_register (RP_REGNUM
) & ~0x3;
985 pc
= read_memory_integer (frame
->frame
+ rp_offset
,
986 TARGET_PTR_BIT
/ 8) & ~0x3;
990 /* If PC is inside a linker stub, then dig out the address the stub
993 Don't do this for long branch stubs. Why? For some unknown reason
994 _start is marked as a long branch stub in hpux10. */
995 u
= find_unwind_entry (pc
);
996 if (u
&& u
->stub_unwind
.stub_type
!= 0
997 && u
->stub_unwind
.stub_type
!= LONG_BRANCH
)
1001 /* If this is a dynamic executable, and we're in a signal handler,
1002 then the call chain will eventually point us into the stub for
1003 _sigreturn. Unlike most cases, we'll be pointed to the branch
1004 to the real sigreturn rather than the code after the real branch!.
1006 Else, try to dig the address the stub will return to in the normal
1008 insn
= read_memory_integer (pc
, 4);
1009 if ((insn
& 0xfc00e000) == 0xe8000000)
1010 return (pc
+ extract_17 (insn
) + 8) & ~0x3;
1016 if (spun_around_loop
> 1)
1018 /* We're just about to go around the loop again with
1019 no more hope of success. Die. */
1020 error ("Unable to find return pc for this frame");
1030 /* We need to correct the PC and the FP for the outermost frame when we are
1031 in a system call. */
1034 init_extra_frame_info (int fromleaf
, struct frame_info
*frame
)
1039 if (frame
->next
&& !fromleaf
)
1042 /* If the next frame represents a frameless function invocation
1043 then we have to do some adjustments that are normally done by
1044 FRAME_CHAIN. (FRAME_CHAIN is not called in this case.) */
1047 /* Find the framesize of *this* frame without peeking at the PC
1048 in the current frame structure (it isn't set yet). */
1049 framesize
= find_proc_framesize (FRAME_SAVED_PC (get_next_frame (frame
)));
1051 /* Now adjust our base frame accordingly. If we have a frame pointer
1052 use it, else subtract the size of this frame from the current
1053 frame. (we always want frame->frame to point at the lowest address
1055 if (framesize
== -1)
1056 frame
->frame
= TARGET_READ_FP ();
1058 frame
->frame
-= framesize
;
1062 flags
= read_register (FLAGS_REGNUM
);
1063 if (flags
& 2) /* In system call? */
1064 frame
->pc
= read_register (31) & ~0x3;
1066 /* The outermost frame is always derived from PC-framesize
1068 One might think frameless innermost frames should have
1069 a frame->frame that is the same as the parent's frame->frame.
1070 That is wrong; frame->frame in that case should be the *high*
1071 address of the parent's frame. It's complicated as hell to
1072 explain, but the parent *always* creates some stack space for
1073 the child. So the child actually does have a frame of some
1074 sorts, and its base is the high address in its parent's frame. */
1075 framesize
= find_proc_framesize (frame
->pc
);
1076 if (framesize
== -1)
1077 frame
->frame
= TARGET_READ_FP ();
1079 frame
->frame
= read_register (SP_REGNUM
) - framesize
;
1082 /* Given a GDB frame, determine the address of the calling function's frame.
1083 This will be used to create a new GDB frame struct, and then
1084 INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
1086 This may involve searching through prologues for several functions
1087 at boundaries where GCC calls HP C code, or where code which has
1088 a frame pointer calls code without a frame pointer. */
1091 frame_chain (struct frame_info
*frame
)
1093 int my_framesize
, caller_framesize
;
1094 struct unwind_table_entry
*u
;
1095 CORE_ADDR frame_base
;
1096 struct frame_info
*tmp_frame
;
1098 /* A frame in the current frame list, or zero. */
1099 struct frame_info
*saved_regs_frame
= 0;
1100 /* Where the registers were saved in saved_regs_frame.
1101 If saved_regs_frame is zero, this is garbage. */
1102 struct frame_saved_regs saved_regs
;
1104 CORE_ADDR caller_pc
;
1106 struct minimal_symbol
*min_frame_symbol
;
1107 struct symbol
*frame_symbol
;
1108 char *frame_symbol_name
;
1110 /* If this is a threaded application, and we see the
1111 routine "__pthread_exit", treat it as the stack root
1113 min_frame_symbol
= lookup_minimal_symbol_by_pc (frame
->pc
);
1114 frame_symbol
= find_pc_function (frame
->pc
);
1116 if ((min_frame_symbol
!= 0) /* && (frame_symbol == 0) */ )
1118 /* The test above for "no user function name" would defend
1119 against the slim likelihood that a user might define a
1120 routine named "__pthread_exit" and then try to debug it.
1122 If it weren't commented out, and you tried to debug the
1123 pthread library itself, you'd get errors.
1125 So for today, we don't make that check. */
1126 frame_symbol_name
= SYMBOL_NAME (min_frame_symbol
);
1127 if (frame_symbol_name
!= 0)
1129 if (0 == strncmp (frame_symbol_name
,
1130 THREAD_INITIAL_FRAME_SYMBOL
,
1131 THREAD_INITIAL_FRAME_SYM_LEN
))
1133 /* Pretend we've reached the bottom of the stack. */
1134 return (CORE_ADDR
) 0;
1137 } /* End of hacky code for threads. */
1139 /* Handle HPUX, BSD, and OSF1 style interrupt frames first. These
1140 are easy; at *sp we have a full save state strucutre which we can
1141 pull the old stack pointer from. Also see frame_saved_pc for
1142 code to dig a saved PC out of the save state structure. */
1143 if (pc_in_interrupt_handler (frame
->pc
))
1144 frame_base
= read_memory_integer (frame
->frame
+ SP_REGNUM
* 4,
1145 TARGET_PTR_BIT
/ 8);
1146 #ifdef FRAME_BASE_BEFORE_SIGTRAMP
1147 else if (frame
->signal_handler_caller
)
1149 FRAME_BASE_BEFORE_SIGTRAMP (frame
, &frame_base
);
1153 frame_base
= frame
->frame
;
1155 /* Get frame sizes for the current frame and the frame of the
1157 my_framesize
= find_proc_framesize (frame
->pc
);
1158 caller_pc
= FRAME_SAVED_PC (frame
);
1160 /* If we can't determine the caller's PC, then it's not likely we can
1161 really determine anything meaningful about its frame. We'll consider
1162 this to be stack bottom. */
1163 if (caller_pc
== (CORE_ADDR
) 0)
1164 return (CORE_ADDR
) 0;
1166 caller_framesize
= find_proc_framesize (FRAME_SAVED_PC (frame
));
1168 /* If caller does not have a frame pointer, then its frame
1169 can be found at current_frame - caller_framesize. */
1170 if (caller_framesize
!= -1)
1172 return frame_base
- caller_framesize
;
1174 /* Both caller and callee have frame pointers and are GCC compiled
1175 (SAVE_SP bit in unwind descriptor is on for both functions.
1176 The previous frame pointer is found at the top of the current frame. */
1177 if (caller_framesize
== -1 && my_framesize
== -1)
1179 return read_memory_integer (frame_base
, TARGET_PTR_BIT
/ 8);
1181 /* Caller has a frame pointer, but callee does not. This is a little
1182 more difficult as GCC and HP C lay out locals and callee register save
1183 areas very differently.
1185 The previous frame pointer could be in a register, or in one of
1186 several areas on the stack.
1188 Walk from the current frame to the innermost frame examining
1189 unwind descriptors to determine if %r3 ever gets saved into the
1190 stack. If so return whatever value got saved into the stack.
1191 If it was never saved in the stack, then the value in %r3 is still
1194 We use information from unwind descriptors to determine if %r3
1195 is saved into the stack (Entry_GR field has this information). */
1197 for (tmp_frame
= frame
; tmp_frame
; tmp_frame
= tmp_frame
->next
)
1199 u
= find_unwind_entry (tmp_frame
->pc
);
1203 /* We could find this information by examining prologues. I don't
1204 think anyone has actually written any tools (not even "strip")
1205 which leave them out of an executable, so maybe this is a moot
1207 /* ??rehrauer: Actually, it's quite possible to stepi your way into
1208 code that doesn't have unwind entries. For example, stepping into
1209 the dynamic linker will give you a PC that has none. Thus, I've
1210 disabled this warning. */
1212 warning ("Unable to find unwind for PC 0x%x -- Help!", tmp_frame
->pc
);
1214 return (CORE_ADDR
) 0;
1218 || tmp_frame
->signal_handler_caller
1219 || pc_in_interrupt_handler (tmp_frame
->pc
))
1222 /* Entry_GR specifies the number of callee-saved general registers
1223 saved in the stack. It starts at %r3, so %r3 would be 1. */
1224 if (u
->Entry_GR
>= 1)
1226 /* The unwind entry claims that r3 is saved here. However,
1227 in optimized code, GCC often doesn't actually save r3.
1228 We'll discover this if we look at the prologue. */
1229 get_frame_saved_regs (tmp_frame
, &saved_regs
);
1230 saved_regs_frame
= tmp_frame
;
1232 /* If we have an address for r3, that's good. */
1233 if (saved_regs
.regs
[FP_REGNUM
])
1240 /* We may have walked down the chain into a function with a frame
1243 && !tmp_frame
->signal_handler_caller
1244 && !pc_in_interrupt_handler (tmp_frame
->pc
))
1246 return read_memory_integer (tmp_frame
->frame
, TARGET_PTR_BIT
/ 8);
1248 /* %r3 was saved somewhere in the stack. Dig it out. */
1253 For optimization purposes many kernels don't have the
1254 callee saved registers into the save_state structure upon
1255 entry into the kernel for a syscall; the optimization
1256 is usually turned off if the process is being traced so
1257 that the debugger can get full register state for the
1260 This scheme works well except for two cases:
1262 * Attaching to a process when the process is in the
1263 kernel performing a system call (debugger can't get
1264 full register state for the inferior process since
1265 the process wasn't being traced when it entered the
1268 * Register state is not complete if the system call
1269 causes the process to core dump.
1272 The following heinous code is an attempt to deal with
1273 the lack of register state in a core dump. It will
1274 fail miserably if the function which performs the
1275 system call has a variable sized stack frame. */
1277 if (tmp_frame
!= saved_regs_frame
)
1278 get_frame_saved_regs (tmp_frame
, &saved_regs
);
1280 /* Abominable hack. */
1281 if (current_target
.to_has_execution
== 0
1282 && ((saved_regs
.regs
[FLAGS_REGNUM
]
1283 && (read_memory_integer (saved_regs
.regs
[FLAGS_REGNUM
],
1286 || (saved_regs
.regs
[FLAGS_REGNUM
] == 0
1287 && read_register (FLAGS_REGNUM
) & 0x2)))
1289 u
= find_unwind_entry (FRAME_SAVED_PC (frame
));
1292 return read_memory_integer (saved_regs
.regs
[FP_REGNUM
],
1293 TARGET_PTR_BIT
/ 8);
1297 return frame_base
- (u
->Total_frame_size
<< 3);
1301 return read_memory_integer (saved_regs
.regs
[FP_REGNUM
],
1302 TARGET_PTR_BIT
/ 8);
1307 /* Get the innermost frame. */
1309 while (tmp_frame
->next
!= NULL
)
1310 tmp_frame
= tmp_frame
->next
;
1312 if (tmp_frame
!= saved_regs_frame
)
1313 get_frame_saved_regs (tmp_frame
, &saved_regs
);
1315 /* Abominable hack. See above. */
1316 if (current_target
.to_has_execution
== 0
1317 && ((saved_regs
.regs
[FLAGS_REGNUM
]
1318 && (read_memory_integer (saved_regs
.regs
[FLAGS_REGNUM
],
1321 || (saved_regs
.regs
[FLAGS_REGNUM
] == 0
1322 && read_register (FLAGS_REGNUM
) & 0x2)))
1324 u
= find_unwind_entry (FRAME_SAVED_PC (frame
));
1327 return read_memory_integer (saved_regs
.regs
[FP_REGNUM
],
1328 TARGET_PTR_BIT
/ 8);
1332 return frame_base
- (u
->Total_frame_size
<< 3);
1336 /* The value in %r3 was never saved into the stack (thus %r3 still
1337 holds the value of the previous frame pointer). */
1338 return TARGET_READ_FP ();
1343 /* To see if a frame chain is valid, see if the caller looks like it
1344 was compiled with gcc. */
1347 hppa_frame_chain_valid (CORE_ADDR chain
, struct frame_info
*thisframe
)
1349 struct minimal_symbol
*msym_us
;
1350 struct minimal_symbol
*msym_start
;
1351 struct unwind_table_entry
*u
, *next_u
= NULL
;
1352 struct frame_info
*next
;
1357 u
= find_unwind_entry (thisframe
->pc
);
1362 /* We can't just check that the same of msym_us is "_start", because
1363 someone idiotically decided that they were going to make a Ltext_end
1364 symbol with the same address. This Ltext_end symbol is totally
1365 indistinguishable (as nearly as I can tell) from the symbol for a function
1366 which is (legitimately, since it is in the user's namespace)
1367 named Ltext_end, so we can't just ignore it. */
1368 msym_us
= lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe
));
1369 msym_start
= lookup_minimal_symbol ("_start", NULL
, NULL
);
1372 && SYMBOL_VALUE_ADDRESS (msym_us
) == SYMBOL_VALUE_ADDRESS (msym_start
))
1375 /* Grrrr. Some new idiot decided that they don't want _start for the
1376 PRO configurations; $START$ calls main directly.... Deal with it. */
1377 msym_start
= lookup_minimal_symbol ("$START$", NULL
, NULL
);
1380 && SYMBOL_VALUE_ADDRESS (msym_us
) == SYMBOL_VALUE_ADDRESS (msym_start
))
1383 next
= get_next_frame (thisframe
);
1385 next_u
= find_unwind_entry (next
->pc
);
1387 /* If this frame does not save SP, has no stack, isn't a stub,
1388 and doesn't "call" an interrupt routine or signal handler caller,
1389 then its not valid. */
1390 if (u
->Save_SP
|| u
->Total_frame_size
|| u
->stub_unwind
.stub_type
!= 0
1391 || (thisframe
->next
&& thisframe
->next
->signal_handler_caller
)
1392 || (next_u
&& next_u
->HP_UX_interrupt_marker
))
1395 if (pc_in_linker_stub (thisframe
->pc
))
1402 These functions deal with saving and restoring register state
1403 around a function call in the inferior. They keep the stack
1404 double-word aligned; eventually, on an hp700, the stack will have
1405 to be aligned to a 64-byte boundary. */
1408 push_dummy_frame (struct inferior_status
*inf_status
)
1410 CORE_ADDR sp
, pc
, pcspace
;
1411 register int regnum
;
1412 CORE_ADDR int_buffer
;
1415 /* Oh, what a hack. If we're trying to perform an inferior call
1416 while the inferior is asleep, we have to make sure to clear
1417 the "in system call" bit in the flag register (the call will
1418 start after the syscall returns, so we're no longer in the system
1419 call!) This state is kept in "inf_status", change it there.
1421 We also need a number of horrid hacks to deal with lossage in the
1422 PC queue registers (apparently they're not valid when the in syscall
1424 pc
= target_read_pc (inferior_ptid
);
1425 int_buffer
= read_register (FLAGS_REGNUM
);
1426 if (int_buffer
& 0x2)
1430 write_inferior_status_register (inf_status
, 0, int_buffer
);
1431 write_inferior_status_register (inf_status
, PCOQ_HEAD_REGNUM
, pc
+ 0);
1432 write_inferior_status_register (inf_status
, PCOQ_TAIL_REGNUM
, pc
+ 4);
1433 sid
= (pc
>> 30) & 0x3;
1435 pcspace
= read_register (SR4_REGNUM
);
1437 pcspace
= read_register (SR4_REGNUM
+ 4 + sid
);
1438 write_inferior_status_register (inf_status
, PCSQ_HEAD_REGNUM
, pcspace
);
1439 write_inferior_status_register (inf_status
, PCSQ_TAIL_REGNUM
, pcspace
);
1442 pcspace
= read_register (PCSQ_HEAD_REGNUM
);
1444 /* Space for "arguments"; the RP goes in here. */
1445 sp
= read_register (SP_REGNUM
) + 48;
1446 int_buffer
= read_register (RP_REGNUM
) | 0x3;
1448 /* The 32bit and 64bit ABIs save the return pointer into different
1450 if (REGISTER_SIZE
== 8)
1451 write_memory (sp
- 16, (char *) &int_buffer
, REGISTER_SIZE
);
1453 write_memory (sp
- 20, (char *) &int_buffer
, REGISTER_SIZE
);
1455 int_buffer
= TARGET_READ_FP ();
1456 write_memory (sp
, (char *) &int_buffer
, REGISTER_SIZE
);
1458 write_register (FP_REGNUM
, sp
);
1460 sp
+= 2 * REGISTER_SIZE
;
1462 for (regnum
= 1; regnum
< 32; regnum
++)
1463 if (regnum
!= RP_REGNUM
&& regnum
!= FP_REGNUM
)
1464 sp
= push_word (sp
, read_register (regnum
));
1466 /* This is not necessary for the 64bit ABI. In fact it is dangerous. */
1467 if (REGISTER_SIZE
!= 8)
1470 for (regnum
= FP0_REGNUM
; regnum
< NUM_REGS
; regnum
++)
1472 read_register_bytes (REGISTER_BYTE (regnum
), (char *) &freg_buffer
, 8);
1473 sp
= push_bytes (sp
, (char *) &freg_buffer
, 8);
1475 sp
= push_word (sp
, read_register (IPSW_REGNUM
));
1476 sp
= push_word (sp
, read_register (SAR_REGNUM
));
1477 sp
= push_word (sp
, pc
);
1478 sp
= push_word (sp
, pcspace
);
1479 sp
= push_word (sp
, pc
+ 4);
1480 sp
= push_word (sp
, pcspace
);
1481 write_register (SP_REGNUM
, sp
);
1485 find_dummy_frame_regs (struct frame_info
*frame
,
1486 struct frame_saved_regs
*frame_saved_regs
)
1488 CORE_ADDR fp
= frame
->frame
;
1491 /* The 32bit and 64bit ABIs save RP into different locations. */
1492 if (REGISTER_SIZE
== 8)
1493 frame_saved_regs
->regs
[RP_REGNUM
] = (fp
- 16) & ~0x3;
1495 frame_saved_regs
->regs
[RP_REGNUM
] = (fp
- 20) & ~0x3;
1497 frame_saved_regs
->regs
[FP_REGNUM
] = fp
;
1499 frame_saved_regs
->regs
[1] = fp
+ (2 * REGISTER_SIZE
);
1501 for (fp
+= 3 * REGISTER_SIZE
, i
= 3; i
< 32; i
++)
1505 frame_saved_regs
->regs
[i
] = fp
;
1506 fp
+= REGISTER_SIZE
;
1510 /* This is not necessary or desirable for the 64bit ABI. */
1511 if (REGISTER_SIZE
!= 8)
1514 for (i
= FP0_REGNUM
; i
< NUM_REGS
; i
++, fp
+= 8)
1515 frame_saved_regs
->regs
[i
] = fp
;
1517 frame_saved_regs
->regs
[IPSW_REGNUM
] = fp
;
1518 frame_saved_regs
->regs
[SAR_REGNUM
] = fp
+ REGISTER_SIZE
;
1519 frame_saved_regs
->regs
[PCOQ_HEAD_REGNUM
] = fp
+ 2 * REGISTER_SIZE
;
1520 frame_saved_regs
->regs
[PCSQ_HEAD_REGNUM
] = fp
+ 3 * REGISTER_SIZE
;
1521 frame_saved_regs
->regs
[PCOQ_TAIL_REGNUM
] = fp
+ 4 * REGISTER_SIZE
;
1522 frame_saved_regs
->regs
[PCSQ_TAIL_REGNUM
] = fp
+ 5 * REGISTER_SIZE
;
1526 hppa_pop_frame (void)
1528 register struct frame_info
*frame
= get_current_frame ();
1529 register CORE_ADDR fp
, npc
, target_pc
;
1530 register int regnum
;
1531 struct frame_saved_regs fsr
;
1534 fp
= FRAME_FP (frame
);
1535 get_frame_saved_regs (frame
, &fsr
);
1537 #ifndef NO_PC_SPACE_QUEUE_RESTORE
1538 if (fsr
.regs
[IPSW_REGNUM
]) /* Restoring a call dummy frame */
1539 restore_pc_queue (&fsr
);
1542 for (regnum
= 31; regnum
> 0; regnum
--)
1543 if (fsr
.regs
[regnum
])
1544 write_register (regnum
, read_memory_integer (fsr
.regs
[regnum
],
1547 for (regnum
= NUM_REGS
- 1; regnum
>= FP0_REGNUM
; regnum
--)
1548 if (fsr
.regs
[regnum
])
1550 read_memory (fsr
.regs
[regnum
], (char *) &freg_buffer
, 8);
1551 write_register_bytes (REGISTER_BYTE (regnum
), (char *) &freg_buffer
, 8);
1554 if (fsr
.regs
[IPSW_REGNUM
])
1555 write_register (IPSW_REGNUM
,
1556 read_memory_integer (fsr
.regs
[IPSW_REGNUM
],
1559 if (fsr
.regs
[SAR_REGNUM
])
1560 write_register (SAR_REGNUM
,
1561 read_memory_integer (fsr
.regs
[SAR_REGNUM
],
1564 /* If the PC was explicitly saved, then just restore it. */
1565 if (fsr
.regs
[PCOQ_TAIL_REGNUM
])
1567 npc
= read_memory_integer (fsr
.regs
[PCOQ_TAIL_REGNUM
],
1569 write_register (PCOQ_TAIL_REGNUM
, npc
);
1571 /* Else use the value in %rp to set the new PC. */
1574 npc
= read_register (RP_REGNUM
);
1578 write_register (FP_REGNUM
, read_memory_integer (fp
, REGISTER_SIZE
));
1580 if (fsr
.regs
[IPSW_REGNUM
]) /* call dummy */
1581 write_register (SP_REGNUM
, fp
- 48);
1583 write_register (SP_REGNUM
, fp
);
1585 /* The PC we just restored may be inside a return trampoline. If so
1586 we want to restart the inferior and run it through the trampoline.
1588 Do this by setting a momentary breakpoint at the location the
1589 trampoline returns to.
1591 Don't skip through the trampoline if we're popping a dummy frame. */
1592 target_pc
= SKIP_TRAMPOLINE_CODE (npc
& ~0x3) & ~0x3;
1593 if (target_pc
&& !fsr
.regs
[IPSW_REGNUM
])
1595 struct symtab_and_line sal
;
1596 struct breakpoint
*breakpoint
;
1597 struct cleanup
*old_chain
;
1599 /* Set up our breakpoint. Set it to be silent as the MI code
1600 for "return_command" will print the frame we returned to. */
1601 sal
= find_pc_line (target_pc
, 0);
1603 breakpoint
= set_momentary_breakpoint (sal
, NULL
, bp_finish
);
1604 breakpoint
->silent
= 1;
1606 /* So we can clean things up. */
1607 old_chain
= make_cleanup_delete_breakpoint (breakpoint
);
1609 /* Start up the inferior. */
1610 clear_proceed_status ();
1611 proceed_to_finish
= 1;
1612 proceed ((CORE_ADDR
) -1, TARGET_SIGNAL_DEFAULT
, 0);
1614 /* Perform our cleanups. */
1615 do_cleanups (old_chain
);
1617 flush_cached_frames ();
1620 /* After returning to a dummy on the stack, restore the instruction
1621 queue space registers. */
1624 restore_pc_queue (struct frame_saved_regs
*fsr
)
1626 CORE_ADDR pc
= read_pc ();
1627 CORE_ADDR new_pc
= read_memory_integer (fsr
->regs
[PCOQ_HEAD_REGNUM
],
1628 TARGET_PTR_BIT
/ 8);
1629 struct target_waitstatus w
;
1632 /* Advance past break instruction in the call dummy. */
1633 write_register (PCOQ_HEAD_REGNUM
, pc
+ 4);
1634 write_register (PCOQ_TAIL_REGNUM
, pc
+ 8);
1636 /* HPUX doesn't let us set the space registers or the space
1637 registers of the PC queue through ptrace. Boo, hiss.
1638 Conveniently, the call dummy has this sequence of instructions
1643 So, load up the registers and single step until we are in the
1646 write_register (21, read_memory_integer (fsr
->regs
[PCSQ_HEAD_REGNUM
],
1648 write_register (22, new_pc
);
1650 for (insn_count
= 0; insn_count
< 3; insn_count
++)
1652 /* FIXME: What if the inferior gets a signal right now? Want to
1653 merge this into wait_for_inferior (as a special kind of
1654 watchpoint? By setting a breakpoint at the end? Is there
1655 any other choice? Is there *any* way to do this stuff with
1656 ptrace() or some equivalent?). */
1658 target_wait (inferior_ptid
, &w
);
1660 if (w
.kind
== TARGET_WAITKIND_SIGNALLED
)
1662 stop_signal
= w
.value
.sig
;
1663 terminal_ours_for_output ();
1664 printf_unfiltered ("\nProgram terminated with signal %s, %s.\n",
1665 target_signal_to_name (stop_signal
),
1666 target_signal_to_string (stop_signal
));
1667 gdb_flush (gdb_stdout
);
1671 target_terminal_ours ();
1672 target_fetch_registers (-1);
1677 #ifdef PA20W_CALLING_CONVENTIONS
1679 /* This function pushes a stack frame with arguments as part of the
1680 inferior function calling mechanism.
1682 This is the version for the PA64, in which later arguments appear
1683 at higher addresses. (The stack always grows towards higher
1686 We simply allocate the appropriate amount of stack space and put
1687 arguments into their proper slots. The call dummy code will copy
1688 arguments into registers as needed by the ABI.
1690 This ABI also requires that the caller provide an argument pointer
1691 to the callee, so we do that too. */
1694 hppa_push_arguments (int nargs
, struct value
**args
, CORE_ADDR sp
,
1695 int struct_return
, CORE_ADDR struct_addr
)
1697 /* array of arguments' offsets */
1698 int *offset
= (int *) alloca (nargs
* sizeof (int));
1700 /* array of arguments' lengths: real lengths in bytes, not aligned to
1702 int *lengths
= (int *) alloca (nargs
* sizeof (int));
1704 /* The value of SP as it was passed into this function after
1706 CORE_ADDR orig_sp
= STACK_ALIGN (sp
);
1708 /* The number of stack bytes occupied by the current argument. */
1711 /* The total number of bytes reserved for the arguments. */
1712 int cum_bytes_reserved
= 0;
1714 /* Similarly, but aligned. */
1715 int cum_bytes_aligned
= 0;
1718 /* Iterate over each argument provided by the user. */
1719 for (i
= 0; i
< nargs
; i
++)
1721 struct type
*arg_type
= VALUE_TYPE (args
[i
]);
1723 /* Integral scalar values smaller than a register are padded on
1724 the left. We do this by promoting them to full-width,
1725 although the ABI says to pad them with garbage. */
1726 if (is_integral_type (arg_type
)
1727 && TYPE_LENGTH (arg_type
) < REGISTER_SIZE
)
1729 args
[i
] = value_cast ((TYPE_UNSIGNED (arg_type
)
1730 ? builtin_type_unsigned_long
1731 : builtin_type_long
),
1733 arg_type
= VALUE_TYPE (args
[i
]);
1736 lengths
[i
] = TYPE_LENGTH (arg_type
);
1738 /* Align the size of the argument to the word size for this
1740 bytes_reserved
= (lengths
[i
] + REGISTER_SIZE
- 1) & -REGISTER_SIZE
;
1742 offset
[i
] = cum_bytes_reserved
;
1744 /* Aggregates larger than eight bytes (the only types larger
1745 than eight bytes we have) are aligned on a 16-byte boundary,
1746 possibly padded on the right with garbage. This may leave an
1747 empty word on the stack, and thus an unused register, as per
1749 if (bytes_reserved
> 8)
1751 /* Round up the offset to a multiple of two slots. */
1752 int new_offset
= ((offset
[i
] + 2*REGISTER_SIZE
-1)
1753 & -(2*REGISTER_SIZE
));
1755 /* Note the space we've wasted, if any. */
1756 bytes_reserved
+= new_offset
- offset
[i
];
1757 offset
[i
] = new_offset
;
1760 cum_bytes_reserved
+= bytes_reserved
;
1763 /* CUM_BYTES_RESERVED already accounts for all the arguments
1764 passed by the user. However, the ABIs mandate minimum stack space
1765 allocations for outgoing arguments.
1767 The ABIs also mandate minimum stack alignments which we must
1769 cum_bytes_aligned
= STACK_ALIGN (cum_bytes_reserved
);
1770 sp
+= max (cum_bytes_aligned
, REG_PARM_STACK_SPACE
);
1772 /* Now write each of the args at the proper offset down the stack. */
1773 for (i
= 0; i
< nargs
; i
++)
1774 write_memory (orig_sp
+ offset
[i
], VALUE_CONTENTS (args
[i
]), lengths
[i
]);
1776 /* If a structure has to be returned, set up register 28 to hold its
1779 write_register (28, struct_addr
);
1781 /* For the PA64 we must pass a pointer to the outgoing argument list.
1782 The ABI mandates that the pointer should point to the first byte of
1783 storage beyond the register flushback area.
1785 However, the call dummy expects the outgoing argument pointer to
1786 be passed in register %r4. */
1787 write_register (4, orig_sp
+ REG_PARM_STACK_SPACE
);
1789 /* ?!? This needs further work. We need to set up the global data
1790 pointer for this procedure. This assumes the same global pointer
1791 for every procedure. The call dummy expects the dp value to
1792 be passed in register %r6. */
1793 write_register (6, read_register (27));
1795 /* The stack will have 64 bytes of additional space for a frame marker. */
1801 /* This function pushes a stack frame with arguments as part of the
1802 inferior function calling mechanism.
1804 This is the version of the function for the 32-bit PA machines, in
1805 which later arguments appear at lower addresses. (The stack always
1806 grows towards higher addresses.)
1808 We simply allocate the appropriate amount of stack space and put
1809 arguments into their proper slots. The call dummy code will copy
1810 arguments into registers as needed by the ABI. */
1813 hppa_push_arguments (int nargs
, struct value
**args
, CORE_ADDR sp
,
1814 int struct_return
, CORE_ADDR struct_addr
)
1816 /* array of arguments' offsets */
1817 int *offset
= (int *) alloca (nargs
* sizeof (int));
1819 /* array of arguments' lengths: real lengths in bytes, not aligned to
1821 int *lengths
= (int *) alloca (nargs
* sizeof (int));
1823 /* The number of stack bytes occupied by the current argument. */
1826 /* The total number of bytes reserved for the arguments. */
1827 int cum_bytes_reserved
= 0;
1829 /* Similarly, but aligned. */
1830 int cum_bytes_aligned
= 0;
1833 /* Iterate over each argument provided by the user. */
1834 for (i
= 0; i
< nargs
; i
++)
1836 lengths
[i
] = TYPE_LENGTH (VALUE_TYPE (args
[i
]));
1838 /* Align the size of the argument to the word size for this
1840 bytes_reserved
= (lengths
[i
] + REGISTER_SIZE
- 1) & -REGISTER_SIZE
;
1842 offset
[i
] = (cum_bytes_reserved
1843 + (lengths
[i
] > 4 ? bytes_reserved
: lengths
[i
]));
1845 /* If the argument is a double word argument, then it needs to be
1846 double word aligned. */
1847 if ((bytes_reserved
== 2 * REGISTER_SIZE
)
1848 && (offset
[i
] % 2 * REGISTER_SIZE
))
1851 /* BYTES_RESERVED is already aligned to the word, so we put
1852 the argument at one word more down the stack.
1854 This will leave one empty word on the stack, and one unused
1855 register as mandated by the ABI. */
1856 new_offset
= ((offset
[i
] + 2 * REGISTER_SIZE
- 1)
1857 & -(2 * REGISTER_SIZE
));
1859 if ((new_offset
- offset
[i
]) >= 2 * REGISTER_SIZE
)
1861 bytes_reserved
+= REGISTER_SIZE
;
1862 offset
[i
] += REGISTER_SIZE
;
1866 cum_bytes_reserved
+= bytes_reserved
;
1870 /* CUM_BYTES_RESERVED already accounts for all the arguments passed
1871 by the user. However, the ABI mandates minimum stack space
1872 allocations for outgoing arguments.
1874 The ABI also mandates minimum stack alignments which we must
1876 cum_bytes_aligned
= STACK_ALIGN (cum_bytes_reserved
);
1877 sp
+= max (cum_bytes_aligned
, REG_PARM_STACK_SPACE
);
1879 /* Now write each of the args at the proper offset down the stack.
1880 ?!? We need to promote values to a full register instead of skipping
1881 words in the stack. */
1882 for (i
= 0; i
< nargs
; i
++)
1883 write_memory (sp
- offset
[i
], VALUE_CONTENTS (args
[i
]), lengths
[i
]);
1885 /* If a structure has to be returned, set up register 28 to hold its
1888 write_register (28, struct_addr
);
1890 /* The stack will have 32 bytes of additional space for a frame marker. */
1896 /* elz: this function returns a value which is built looking at the given address.
1897 It is called from call_function_by_hand, in case we need to return a
1898 value which is larger than 64 bits, and it is stored in the stack rather than
1899 in the registers r28 and r29 or fr4.
1900 This function does the same stuff as value_being_returned in values.c, but
1901 gets the value from the stack rather than from the buffer where all the
1902 registers were saved when the function called completed. */
1904 hppa_value_returned_from_stack (register struct type
*valtype
, CORE_ADDR addr
)
1906 register struct value
*val
;
1908 val
= allocate_value (valtype
);
1909 CHECK_TYPEDEF (valtype
);
1910 target_read_memory (addr
, VALUE_CONTENTS_RAW (val
), TYPE_LENGTH (valtype
));
1917 /* elz: Used to lookup a symbol in the shared libraries.
1918 This function calls shl_findsym, indirectly through a
1919 call to __d_shl_get. __d_shl_get is in end.c, which is always
1920 linked in by the hp compilers/linkers.
1921 The call to shl_findsym cannot be made directly because it needs
1922 to be active in target address space.
1923 inputs: - minimal symbol pointer for the function we want to look up
1924 - address in target space of the descriptor for the library
1925 where we want to look the symbol up.
1926 This address is retrieved using the
1927 som_solib_get_solib_by_pc function (somsolib.c).
1928 output: - real address in the library of the function.
1929 note: the handle can be null, in which case shl_findsym will look for
1930 the symbol in all the loaded shared libraries.
1931 files to look at if you need reference on this stuff:
1932 dld.c, dld_shl_findsym.c
1934 man entry for shl_findsym */
1937 find_stub_with_shl_get (struct minimal_symbol
*function
, CORE_ADDR handle
)
1939 struct symbol
*get_sym
, *symbol2
;
1940 struct minimal_symbol
*buff_minsym
, *msymbol
;
1942 struct value
**args
;
1943 struct value
*funcval
;
1946 int x
, namelen
, err_value
, tmp
= -1;
1947 CORE_ADDR endo_buff_addr
, value_return_addr
, errno_return_addr
;
1948 CORE_ADDR stub_addr
;
1951 args
= alloca (sizeof (struct value
*) * 8); /* 6 for the arguments and one null one??? */
1952 funcval
= find_function_in_inferior ("__d_shl_get");
1953 get_sym
= lookup_symbol ("__d_shl_get", NULL
, VAR_NAMESPACE
, NULL
, NULL
);
1954 buff_minsym
= lookup_minimal_symbol ("__buffer", NULL
, NULL
);
1955 msymbol
= lookup_minimal_symbol ("__shldp", NULL
, NULL
);
1956 symbol2
= lookup_symbol ("__shldp", NULL
, VAR_NAMESPACE
, NULL
, NULL
);
1957 endo_buff_addr
= SYMBOL_VALUE_ADDRESS (buff_minsym
);
1958 namelen
= strlen (SYMBOL_NAME (function
));
1959 value_return_addr
= endo_buff_addr
+ namelen
;
1960 ftype
= check_typedef (SYMBOL_TYPE (get_sym
));
1963 if ((x
= value_return_addr
% 64) != 0)
1964 value_return_addr
= value_return_addr
+ 64 - x
;
1966 errno_return_addr
= value_return_addr
+ 64;
1969 /* set up stuff needed by __d_shl_get in buffer in end.o */
1971 target_write_memory (endo_buff_addr
, SYMBOL_NAME (function
), namelen
);
1973 target_write_memory (value_return_addr
, (char *) &tmp
, 4);
1975 target_write_memory (errno_return_addr
, (char *) &tmp
, 4);
1977 target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol
),
1978 (char *) &handle
, 4);
1980 /* now prepare the arguments for the call */
1982 args
[0] = value_from_longest (TYPE_FIELD_TYPE (ftype
, 0), 12);
1983 args
[1] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 1), SYMBOL_VALUE_ADDRESS (msymbol
));
1984 args
[2] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 2), endo_buff_addr
);
1985 args
[3] = value_from_longest (TYPE_FIELD_TYPE (ftype
, 3), TYPE_PROCEDURE
);
1986 args
[4] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 4), value_return_addr
);
1987 args
[5] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 5), errno_return_addr
);
1989 /* now call the function */
1991 val
= call_function_by_hand (funcval
, 6, args
);
1993 /* now get the results */
1995 target_read_memory (errno_return_addr
, (char *) &err_value
, sizeof (err_value
));
1997 target_read_memory (value_return_addr
, (char *) &stub_addr
, sizeof (stub_addr
));
1999 error ("call to __d_shl_get failed, error code is %d", err_value
);
2004 /* Cover routine for find_stub_with_shl_get to pass to catch_errors */
2006 cover_find_stub_with_shl_get (PTR args_untyped
)
2008 args_for_find_stub
*args
= args_untyped
;
2009 args
->return_val
= find_stub_with_shl_get (args
->msym
, args
->solib_handle
);
2013 /* Insert the specified number of args and function address
2014 into a call sequence of the above form stored at DUMMYNAME.
2016 On the hppa we need to call the stack dummy through $$dyncall.
2017 Therefore our version of FIX_CALL_DUMMY takes an extra argument,
2018 real_pc, which is the location where gdb should start up the
2019 inferior to do the function call.
2021 This has to work across several versions of hpux, bsd, osf1. It has to
2022 work regardless of what compiler was used to build the inferior program.
2023 It should work regardless of whether or not end.o is available. It has
2024 to work even if gdb can not call into the dynamic loader in the inferior
2025 to query it for symbol names and addresses.
2027 Yes, all those cases should work. Luckily code exists to handle most
2028 of them. The complexity is in selecting exactly what scheme should
2029 be used to perform the inferior call.
2031 At the current time this routine is known not to handle cases where
2032 the program was linked with HP's compiler without including end.o.
2034 Please contact Jeff Law (law@cygnus.com) before changing this code. */
2037 hppa_fix_call_dummy (char *dummy
, CORE_ADDR pc
, CORE_ADDR fun
, int nargs
,
2038 struct value
**args
, struct type
*type
, int gcc_p
)
2040 CORE_ADDR dyncall_addr
;
2041 struct minimal_symbol
*msymbol
;
2042 struct minimal_symbol
*trampoline
;
2043 int flags
= read_register (FLAGS_REGNUM
);
2044 struct unwind_table_entry
*u
= NULL
;
2045 CORE_ADDR new_stub
= 0;
2046 CORE_ADDR solib_handle
= 0;
2048 /* Nonzero if we will use GCC's PLT call routine. This routine must be
2049 passed an import stub, not a PLABEL. It is also necessary to set %r19
2050 (the PIC register) before performing the call.
2052 If zero, then we are using __d_plt_call (HP's PLT call routine) or we
2053 are calling the target directly. When using __d_plt_call we want to
2054 use a PLABEL instead of an import stub. */
2055 int using_gcc_plt_call
= 1;
2057 #ifdef GDB_TARGET_IS_HPPA_20W
2058 /* We currently use completely different code for the PA2.0W inferior
2059 function call sequences. This needs to be cleaned up. */
2061 CORE_ADDR pcsqh
, pcsqt
, pcoqh
, pcoqt
, sr5
;
2062 struct target_waitstatus w
;
2066 struct objfile
*objfile
;
2068 /* We can not modify the PC space queues directly, so we start
2069 up the inferior and execute a couple instructions to set the
2070 space queues so that they point to the call dummy in the stack. */
2071 pcsqh
= read_register (PCSQ_HEAD_REGNUM
);
2072 sr5
= read_register (SR5_REGNUM
);
2075 pcoqh
= read_register (PCOQ_HEAD_REGNUM
);
2076 pcoqt
= read_register (PCOQ_TAIL_REGNUM
);
2077 if (target_read_memory (pcoqh
, buf
, 4) != 0)
2078 error ("Couldn't modify space queue\n");
2079 inst1
= extract_unsigned_integer (buf
, 4);
2081 if (target_read_memory (pcoqt
, buf
, 4) != 0)
2082 error ("Couldn't modify space queue\n");
2083 inst2
= extract_unsigned_integer (buf
, 4);
2086 *((int *) buf
) = 0xe820d000;
2087 if (target_write_memory (pcoqh
, buf
, 4) != 0)
2088 error ("Couldn't modify space queue\n");
2091 *((int *) buf
) = 0x08000240;
2092 if (target_write_memory (pcoqt
, buf
, 4) != 0)
2094 *((int *) buf
) = inst1
;
2095 target_write_memory (pcoqh
, buf
, 4);
2096 error ("Couldn't modify space queue\n");
2099 write_register (1, pc
);
2101 /* Single step twice, the BVE instruction will set the space queue
2102 such that it points to the PC value written immediately above
2103 (ie the call dummy). */
2105 target_wait (inferior_ptid
, &w
);
2107 target_wait (inferior_ptid
, &w
);
2109 /* Restore the two instructions at the old PC locations. */
2110 *((int *) buf
) = inst1
;
2111 target_write_memory (pcoqh
, buf
, 4);
2112 *((int *) buf
) = inst2
;
2113 target_write_memory (pcoqt
, buf
, 4);
2116 /* The call dummy wants the ultimate destination address initially
2118 write_register (5, fun
);
2120 /* We need to see if this objfile has a different DP value than our
2121 own (it could be a shared library for example). */
2122 ALL_OBJFILES (objfile
)
2124 struct obj_section
*s
;
2125 obj_private_data_t
*obj_private
;
2127 /* See if FUN is in any section within this shared library. */
2128 for (s
= objfile
->sections
; s
< objfile
->sections_end
; s
++)
2129 if (s
->addr
<= fun
&& fun
< s
->endaddr
)
2132 if (s
>= objfile
->sections_end
)
2135 obj_private
= (obj_private_data_t
*) objfile
->obj_private
;
2137 /* The DP value may be different for each objfile. But within an
2138 objfile each function uses the same dp value. Thus we do not need
2139 to grope around the opd section looking for dp values.
2141 ?!? This is not strictly correct since we may be in a shared library
2142 and want to call back into the main program. To make that case
2143 work correctly we need to set obj_private->dp for the main program's
2144 objfile, then remove this conditional. */
2145 if (obj_private
->dp
)
2146 write_register (27, obj_private
->dp
);
2153 #ifndef GDB_TARGET_IS_HPPA_20W
2154 /* Prefer __gcc_plt_call over the HP supplied routine because
2155 __gcc_plt_call works for any number of arguments. */
2157 if (lookup_minimal_symbol ("__gcc_plt_call", NULL
, NULL
) == NULL
)
2158 using_gcc_plt_call
= 0;
2160 msymbol
= lookup_minimal_symbol ("$$dyncall", NULL
, NULL
);
2161 if (msymbol
== NULL
)
2162 error ("Can't find an address for $$dyncall trampoline");
2164 dyncall_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
2166 /* FUN could be a procedure label, in which case we have to get
2167 its real address and the value of its GOT/DP if we plan to
2168 call the routine via gcc_plt_call. */
2169 if ((fun
& 0x2) && using_gcc_plt_call
)
2171 /* Get the GOT/DP value for the target function. It's
2172 at *(fun+4). Note the call dummy is *NOT* allowed to
2173 trash %r19 before calling the target function. */
2174 write_register (19, read_memory_integer ((fun
& ~0x3) + 4,
2177 /* Now get the real address for the function we are calling, it's
2179 fun
= (CORE_ADDR
) read_memory_integer (fun
& ~0x3,
2180 TARGET_PTR_BIT
/ 8);
2185 #ifndef GDB_TARGET_IS_PA_ELF
2186 /* FUN could be an export stub, the real address of a function, or
2187 a PLABEL. When using gcc's PLT call routine we must call an import
2188 stub rather than the export stub or real function for lazy binding
2191 If we are using the gcc PLT call routine, then we need to
2192 get the import stub for the target function. */
2193 if (using_gcc_plt_call
&& som_solib_get_got_by_pc (fun
))
2195 struct objfile
*objfile
;
2196 struct minimal_symbol
*funsymbol
, *stub_symbol
;
2197 CORE_ADDR newfun
= 0;
2199 funsymbol
= lookup_minimal_symbol_by_pc (fun
);
2201 error ("Unable to find minimal symbol for target function.\n");
2203 /* Search all the object files for an import symbol with the
2205 ALL_OBJFILES (objfile
)
2208 = lookup_minimal_symbol_solib_trampoline
2209 (SYMBOL_NAME (funsymbol
), NULL
, objfile
);
2212 stub_symbol
= lookup_minimal_symbol (SYMBOL_NAME (funsymbol
),
2215 /* Found a symbol with the right name. */
2218 struct unwind_table_entry
*u
;
2219 /* It must be a shared library trampoline. */
2220 if (MSYMBOL_TYPE (stub_symbol
) != mst_solib_trampoline
)
2223 /* It must also be an import stub. */
2224 u
= find_unwind_entry (SYMBOL_VALUE (stub_symbol
));
2226 || (u
->stub_unwind
.stub_type
!= IMPORT
2227 #ifdef GDB_NATIVE_HPUX_11
2228 /* Sigh. The hpux 10.20 dynamic linker will blow
2229 chunks if we perform a call to an unbound function
2230 via the IMPORT_SHLIB stub. The hpux 11.00 dynamic
2231 linker will blow chunks if we do not call the
2232 unbound function via the IMPORT_SHLIB stub.
2234 We currently have no way to select bevahior on just
2235 the target. However, we only support HPUX/SOM in
2236 native mode. So we conditinalize on a native
2237 #ifdef. Ugly. Ugly. Ugly */
2238 && u
->stub_unwind
.stub_type
!= IMPORT_SHLIB
2243 /* OK. Looks like the correct import stub. */
2244 newfun
= SYMBOL_VALUE (stub_symbol
);
2247 /* If we found an IMPORT stub, then we want to stop
2248 searching now. If we found an IMPORT_SHLIB, we want
2249 to continue the search in the hopes that we will find
2251 if (u
->stub_unwind
.stub_type
== IMPORT
)
2256 /* Ouch. We did not find an import stub. Make an attempt to
2257 do the right thing instead of just croaking. Most of the
2258 time this will actually work. */
2260 write_register (19, som_solib_get_got_by_pc (fun
));
2262 u
= find_unwind_entry (fun
);
2264 && (u
->stub_unwind
.stub_type
== IMPORT
2265 || u
->stub_unwind
.stub_type
== IMPORT_SHLIB
))
2266 trampoline
= lookup_minimal_symbol ("__gcc_plt_call", NULL
, NULL
);
2268 /* If we found the import stub in the shared library, then we have
2269 to set %r19 before we call the stub. */
2270 if (u
&& u
->stub_unwind
.stub_type
== IMPORT_SHLIB
)
2271 write_register (19, som_solib_get_got_by_pc (fun
));
2276 /* If we are calling into another load module then have sr4export call the
2277 magic __d_plt_call routine which is linked in from end.o.
2279 You can't use _sr4export to make the call as the value in sp-24 will get
2280 fried and you end up returning to the wrong location. You can't call the
2281 target as the code to bind the PLT entry to a function can't return to a
2284 Also, query the dynamic linker in the inferior to provide a suitable
2285 PLABEL for the target function. */
2286 if (!using_gcc_plt_call
)
2290 /* Get a handle for the shared library containing FUN. Given the
2291 handle we can query the shared library for a PLABEL. */
2292 solib_handle
= som_solib_get_solib_by_pc (fun
);
2296 struct minimal_symbol
*fmsymbol
= lookup_minimal_symbol_by_pc (fun
);
2298 trampoline
= lookup_minimal_symbol ("__d_plt_call", NULL
, NULL
);
2300 if (trampoline
== NULL
)
2302 error ("Can't find an address for __d_plt_call or __gcc_plt_call trampoline\nSuggest linking executable with -g or compiling with gcc.");
2305 /* This is where sr4export will jump to. */
2306 new_fun
= SYMBOL_VALUE_ADDRESS (trampoline
);
2308 /* If the function is in a shared library, then call __d_shl_get to
2309 get a PLABEL for the target function. */
2310 new_stub
= find_stub_with_shl_get (fmsymbol
, solib_handle
);
2313 error ("Can't find an import stub for %s", SYMBOL_NAME (fmsymbol
));
2315 /* We have to store the address of the stub in __shlib_funcptr. */
2316 msymbol
= lookup_minimal_symbol ("__shlib_funcptr", NULL
,
2317 (struct objfile
*) NULL
);
2319 if (msymbol
== NULL
)
2320 error ("Can't find an address for __shlib_funcptr");
2321 target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol
),
2322 (char *) &new_stub
, 4);
2324 /* We want sr4export to call __d_plt_call, so we claim it is
2325 the final target. Clear trampoline. */
2331 /* Store upper 21 bits of function address into ldil. fun will either be
2332 the final target (most cases) or __d_plt_call when calling into a shared
2333 library and __gcc_plt_call is not available. */
2334 store_unsigned_integer
2335 (&dummy
[FUNC_LDIL_OFFSET
],
2337 deposit_21 (fun
>> 11,
2338 extract_unsigned_integer (&dummy
[FUNC_LDIL_OFFSET
],
2339 INSTRUCTION_SIZE
)));
2341 /* Store lower 11 bits of function address into ldo */
2342 store_unsigned_integer
2343 (&dummy
[FUNC_LDO_OFFSET
],
2345 deposit_14 (fun
& MASK_11
,
2346 extract_unsigned_integer (&dummy
[FUNC_LDO_OFFSET
],
2347 INSTRUCTION_SIZE
)));
2348 #ifdef SR4EXPORT_LDIL_OFFSET
2351 CORE_ADDR trampoline_addr
;
2353 /* We may still need sr4export's address too. */
2355 if (trampoline
== NULL
)
2357 msymbol
= lookup_minimal_symbol ("_sr4export", NULL
, NULL
);
2358 if (msymbol
== NULL
)
2359 error ("Can't find an address for _sr4export trampoline");
2361 trampoline_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
2364 trampoline_addr
= SYMBOL_VALUE_ADDRESS (trampoline
);
2367 /* Store upper 21 bits of trampoline's address into ldil */
2368 store_unsigned_integer
2369 (&dummy
[SR4EXPORT_LDIL_OFFSET
],
2371 deposit_21 (trampoline_addr
>> 11,
2372 extract_unsigned_integer (&dummy
[SR4EXPORT_LDIL_OFFSET
],
2373 INSTRUCTION_SIZE
)));
2375 /* Store lower 11 bits of trampoline's address into ldo */
2376 store_unsigned_integer
2377 (&dummy
[SR4EXPORT_LDO_OFFSET
],
2379 deposit_14 (trampoline_addr
& MASK_11
,
2380 extract_unsigned_integer (&dummy
[SR4EXPORT_LDO_OFFSET
],
2381 INSTRUCTION_SIZE
)));
2385 write_register (22, pc
);
2387 /* If we are in a syscall, then we should call the stack dummy
2388 directly. $$dyncall is not needed as the kernel sets up the
2389 space id registers properly based on the value in %r31. In
2390 fact calling $$dyncall will not work because the value in %r22
2391 will be clobbered on the syscall exit path.
2393 Similarly if the current PC is in a shared library. Note however,
2394 this scheme won't work if the shared library isn't mapped into
2395 the same space as the stack. */
2398 #ifndef GDB_TARGET_IS_PA_ELF
2399 else if (som_solib_get_got_by_pc (target_read_pc (inferior_ptid
)))
2403 return dyncall_addr
;
2410 /* If the pid is in a syscall, then the FP register is not readable.
2411 We'll return zero in that case, rather than attempting to read it
2412 and cause a warning. */
2414 target_read_fp (int pid
)
2416 int flags
= read_register (FLAGS_REGNUM
);
2420 return (CORE_ADDR
) 0;
2423 /* This is the only site that may directly read_register () the FP
2424 register. All others must use TARGET_READ_FP (). */
2425 return read_register (FP_REGNUM
);
2429 /* Get the PC from %r31 if currently in a syscall. Also mask out privilege
2433 target_read_pc (ptid_t ptid
)
2435 int flags
= read_register_pid (FLAGS_REGNUM
, ptid
);
2437 /* The following test does not belong here. It is OS-specific, and belongs
2439 /* Test SS_INSYSCALL */
2441 return read_register_pid (31, ptid
) & ~0x3;
2443 return read_register_pid (PC_REGNUM
, ptid
) & ~0x3;
2446 /* Write out the PC. If currently in a syscall, then also write the new
2447 PC value into %r31. */
2450 target_write_pc (CORE_ADDR v
, ptid_t ptid
)
2452 int flags
= read_register_pid (FLAGS_REGNUM
, ptid
);
2454 /* The following test does not belong here. It is OS-specific, and belongs
2456 /* If in a syscall, then set %r31. Also make sure to get the
2457 privilege bits set correctly. */
2458 /* Test SS_INSYSCALL */
2460 write_register_pid (31, v
| 0x3, ptid
);
2462 write_register_pid (PC_REGNUM
, v
, ptid
);
2463 write_register_pid (NPC_REGNUM
, v
+ 4, ptid
);
2466 /* return the alignment of a type in bytes. Structures have the maximum
2467 alignment required by their fields. */
2470 hppa_alignof (struct type
*type
)
2472 int max_align
, align
, i
;
2473 CHECK_TYPEDEF (type
);
2474 switch (TYPE_CODE (type
))
2479 return TYPE_LENGTH (type
);
2480 case TYPE_CODE_ARRAY
:
2481 return hppa_alignof (TYPE_FIELD_TYPE (type
, 0));
2482 case TYPE_CODE_STRUCT
:
2483 case TYPE_CODE_UNION
:
2485 for (i
= 0; i
< TYPE_NFIELDS (type
); i
++)
2487 /* Bit fields have no real alignment. */
2488 /* if (!TYPE_FIELD_BITPOS (type, i)) */
2489 if (!TYPE_FIELD_BITSIZE (type
, i
)) /* elz: this should be bitsize */
2491 align
= hppa_alignof (TYPE_FIELD_TYPE (type
, i
));
2492 max_align
= max (max_align
, align
);
2501 /* Print the register regnum, or all registers if regnum is -1 */
2504 pa_do_registers_info (int regnum
, int fpregs
)
2506 char raw_regs
[REGISTER_BYTES
];
2509 /* Make a copy of gdb's save area (may cause actual
2510 reads from the target). */
2511 for (i
= 0; i
< NUM_REGS
; i
++)
2512 frame_register_read (selected_frame
, i
, raw_regs
+ REGISTER_BYTE (i
));
2515 pa_print_registers (raw_regs
, regnum
, fpregs
);
2516 else if (regnum
< FP4_REGNUM
)
2520 /* Why is the value not passed through "extract_signed_integer"
2521 as in "pa_print_registers" below? */
2522 pa_register_look_aside (raw_regs
, regnum
, ®_val
[0]);
2526 printf_unfiltered ("%s %lx\n", REGISTER_NAME (regnum
), reg_val
[1]);
2530 /* Fancy % formats to prevent leading zeros. */
2531 if (reg_val
[0] == 0)
2532 printf_unfiltered ("%s %lx\n", REGISTER_NAME (regnum
), reg_val
[1]);
2534 printf_unfiltered ("%s %lx%8.8lx\n", REGISTER_NAME (regnum
),
2535 reg_val
[0], reg_val
[1]);
2539 /* Note that real floating point values only start at
2540 FP4_REGNUM. FP0 and up are just status and error
2541 registers, which have integral (bit) values. */
2542 pa_print_fp_reg (regnum
);
2545 /********** new function ********************/
2547 pa_do_strcat_registers_info (int regnum
, int fpregs
, struct ui_file
*stream
,
2548 enum precision_type precision
)
2550 char raw_regs
[REGISTER_BYTES
];
2553 /* Make a copy of gdb's save area (may cause actual
2554 reads from the target). */
2555 for (i
= 0; i
< NUM_REGS
; i
++)
2556 frame_register_read (selected_frame
, i
, raw_regs
+ REGISTER_BYTE (i
));
2559 pa_strcat_registers (raw_regs
, regnum
, fpregs
, stream
);
2561 else if (regnum
< FP4_REGNUM
)
2565 /* Why is the value not passed through "extract_signed_integer"
2566 as in "pa_print_registers" below? */
2567 pa_register_look_aside (raw_regs
, regnum
, ®_val
[0]);
2571 fprintf_unfiltered (stream
, "%s %lx", REGISTER_NAME (regnum
), reg_val
[1]);
2575 /* Fancy % formats to prevent leading zeros. */
2576 if (reg_val
[0] == 0)
2577 fprintf_unfiltered (stream
, "%s %lx", REGISTER_NAME (regnum
),
2580 fprintf_unfiltered (stream
, "%s %lx%8.8lx", REGISTER_NAME (regnum
),
2581 reg_val
[0], reg_val
[1]);
2585 /* Note that real floating point values only start at
2586 FP4_REGNUM. FP0 and up are just status and error
2587 registers, which have integral (bit) values. */
2588 pa_strcat_fp_reg (regnum
, stream
, precision
);
2591 /* If this is a PA2.0 machine, fetch the real 64-bit register
2592 value. Otherwise use the info from gdb's saved register area.
2594 Note that reg_val is really expected to be an array of longs,
2595 with two elements. */
2597 pa_register_look_aside (char *raw_regs
, int regnum
, long *raw_val
)
2599 static int know_which
= 0; /* False */
2602 unsigned int offset
;
2607 char buf
[MAX_REGISTER_RAW_SIZE
];
2612 if (CPU_PA_RISC2_0
== sysconf (_SC_CPU_VERSION
))
2617 know_which
= 1; /* True */
2625 raw_val
[1] = *(long *) (raw_regs
+ REGISTER_BYTE (regnum
));
2629 /* Code below copied from hppah-nat.c, with fixes for wide
2630 registers, using different area of save_state, etc. */
2631 if (regnum
== FLAGS_REGNUM
|| regnum
>= FP0_REGNUM
||
2632 !HAVE_STRUCT_SAVE_STATE_T
|| !HAVE_STRUCT_MEMBER_SS_WIDE
)
2634 /* Use narrow regs area of save_state and default macro. */
2635 offset
= U_REGS_OFFSET
;
2636 regaddr
= register_addr (regnum
, offset
);
2641 /* Use wide regs area, and calculate registers as 8 bytes wide.
2643 We'd like to do this, but current version of "C" doesn't
2646 offset = offsetof(save_state_t, ss_wide);
2648 Note that to avoid "C" doing typed pointer arithmetic, we
2649 have to cast away the type in our offset calculation:
2650 otherwise we get an offset of 1! */
2652 /* NB: save_state_t is not available before HPUX 9.
2653 The ss_wide field is not available previous to HPUX 10.20,
2654 so to avoid compile-time warnings, we only compile this for
2655 PA 2.0 processors. This control path should only be followed
2656 if we're debugging a PA 2.0 processor, so this should not cause
2659 /* #if the following code out so that this file can still be
2660 compiled on older HPUX boxes (< 10.20) which don't have
2661 this structure/structure member. */
2662 #if HAVE_STRUCT_SAVE_STATE_T == 1 && HAVE_STRUCT_MEMBER_SS_WIDE == 1
2665 offset
= ((int) &temp
.ss_wide
) - ((int) &temp
);
2666 regaddr
= offset
+ regnum
* 8;
2671 for (i
= start
; i
< 2; i
++)
2674 raw_val
[i
] = call_ptrace (PT_RUREGS
, PIDGET (inferior_ptid
),
2675 (PTRACE_ARG3_TYPE
) regaddr
, 0);
2678 /* Warning, not error, in case we are attached; sometimes the
2679 kernel doesn't let us at the registers. */
2680 char *err
= safe_strerror (errno
);
2681 char *msg
= alloca (strlen (err
) + 128);
2682 sprintf (msg
, "reading register %s: %s", REGISTER_NAME (regnum
), err
);
2687 regaddr
+= sizeof (long);
2690 if (regnum
== PCOQ_HEAD_REGNUM
|| regnum
== PCOQ_TAIL_REGNUM
)
2691 raw_val
[1] &= ~0x3; /* I think we're masking out space bits */
2697 /* "Info all-reg" command */
2700 pa_print_registers (char *raw_regs
, int regnum
, int fpregs
)
2703 /* Alas, we are compiled so that "long long" is 32 bits */
2706 int rows
= 48, columns
= 2;
2708 for (i
= 0; i
< rows
; i
++)
2710 for (j
= 0; j
< columns
; j
++)
2712 /* We display registers in column-major order. */
2713 int regnum
= i
+ j
* rows
;
2715 /* Q: Why is the value passed through "extract_signed_integer",
2716 while above, in "pa_do_registers_info" it isn't?
2718 pa_register_look_aside (raw_regs
, regnum
, &raw_val
[0]);
2720 /* Even fancier % formats to prevent leading zeros
2721 and still maintain the output in columns. */
2724 /* Being big-endian, on this machine the low bits
2725 (the ones we want to look at) are in the second longword. */
2726 long_val
= extract_signed_integer (&raw_val
[1], 4);
2727 printf_filtered ("%10.10s: %8lx ",
2728 REGISTER_NAME (regnum
), long_val
);
2732 /* raw_val = extract_signed_integer(&raw_val, 8); */
2733 if (raw_val
[0] == 0)
2734 printf_filtered ("%10.10s: %8lx ",
2735 REGISTER_NAME (regnum
), raw_val
[1]);
2737 printf_filtered ("%10.10s: %8lx%8.8lx ",
2738 REGISTER_NAME (regnum
),
2739 raw_val
[0], raw_val
[1]);
2742 printf_unfiltered ("\n");
2746 for (i
= FP4_REGNUM
; i
< NUM_REGS
; i
++) /* FP4_REGNUM == 72 */
2747 pa_print_fp_reg (i
);
2750 /************* new function ******************/
2752 pa_strcat_registers (char *raw_regs
, int regnum
, int fpregs
,
2753 struct ui_file
*stream
)
2756 long raw_val
[2]; /* Alas, we are compiled so that "long long" is 32 bits */
2758 enum precision_type precision
;
2760 precision
= unspecified_precision
;
2762 for (i
= 0; i
< 18; i
++)
2764 for (j
= 0; j
< 4; j
++)
2766 /* Q: Why is the value passed through "extract_signed_integer",
2767 while above, in "pa_do_registers_info" it isn't?
2769 pa_register_look_aside (raw_regs
, i
+ (j
* 18), &raw_val
[0]);
2771 /* Even fancier % formats to prevent leading zeros
2772 and still maintain the output in columns. */
2775 /* Being big-endian, on this machine the low bits
2776 (the ones we want to look at) are in the second longword. */
2777 long_val
= extract_signed_integer (&raw_val
[1], 4);
2778 fprintf_filtered (stream
, "%8.8s: %8lx ",
2779 REGISTER_NAME (i
+ (j
* 18)), long_val
);
2783 /* raw_val = extract_signed_integer(&raw_val, 8); */
2784 if (raw_val
[0] == 0)
2785 fprintf_filtered (stream
, "%8.8s: %8lx ",
2786 REGISTER_NAME (i
+ (j
* 18)), raw_val
[1]);
2788 fprintf_filtered (stream
, "%8.8s: %8lx%8.8lx ",
2789 REGISTER_NAME (i
+ (j
* 18)), raw_val
[0],
2793 fprintf_unfiltered (stream
, "\n");
2797 for (i
= FP4_REGNUM
; i
< NUM_REGS
; i
++) /* FP4_REGNUM == 72 */
2798 pa_strcat_fp_reg (i
, stream
, precision
);
2802 pa_print_fp_reg (int i
)
2804 char raw_buffer
[MAX_REGISTER_RAW_SIZE
];
2805 char virtual_buffer
[MAX_REGISTER_VIRTUAL_SIZE
];
2807 /* Get 32bits of data. */
2808 frame_register_read (selected_frame
, i
, raw_buffer
);
2810 /* Put it in the buffer. No conversions are ever necessary. */
2811 memcpy (virtual_buffer
, raw_buffer
, REGISTER_RAW_SIZE (i
));
2813 fputs_filtered (REGISTER_NAME (i
), gdb_stdout
);
2814 print_spaces_filtered (8 - strlen (REGISTER_NAME (i
)), gdb_stdout
);
2815 fputs_filtered ("(single precision) ", gdb_stdout
);
2817 val_print (REGISTER_VIRTUAL_TYPE (i
), virtual_buffer
, 0, 0, gdb_stdout
, 0,
2818 1, 0, Val_pretty_default
);
2819 printf_filtered ("\n");
2821 /* If "i" is even, then this register can also be a double-precision
2822 FP register. Dump it out as such. */
2825 /* Get the data in raw format for the 2nd half. */
2826 frame_register_read (selected_frame
, i
+ 1, raw_buffer
);
2828 /* Copy it into the appropriate part of the virtual buffer. */
2829 memcpy (virtual_buffer
+ REGISTER_RAW_SIZE (i
), raw_buffer
,
2830 REGISTER_RAW_SIZE (i
));
2832 /* Dump it as a double. */
2833 fputs_filtered (REGISTER_NAME (i
), gdb_stdout
);
2834 print_spaces_filtered (8 - strlen (REGISTER_NAME (i
)), gdb_stdout
);
2835 fputs_filtered ("(double precision) ", gdb_stdout
);
2837 val_print (builtin_type_double
, virtual_buffer
, 0, 0, gdb_stdout
, 0,
2838 1, 0, Val_pretty_default
);
2839 printf_filtered ("\n");
2843 /*************** new function ***********************/
2845 pa_strcat_fp_reg (int i
, struct ui_file
*stream
, enum precision_type precision
)
2847 char raw_buffer
[MAX_REGISTER_RAW_SIZE
];
2848 char virtual_buffer
[MAX_REGISTER_VIRTUAL_SIZE
];
2850 fputs_filtered (REGISTER_NAME (i
), stream
);
2851 print_spaces_filtered (8 - strlen (REGISTER_NAME (i
)), stream
);
2853 /* Get 32bits of data. */
2854 frame_register_read (selected_frame
, i
, raw_buffer
);
2856 /* Put it in the buffer. No conversions are ever necessary. */
2857 memcpy (virtual_buffer
, raw_buffer
, REGISTER_RAW_SIZE (i
));
2859 if (precision
== double_precision
&& (i
% 2) == 0)
2862 char raw_buf
[MAX_REGISTER_RAW_SIZE
];
2864 /* Get the data in raw format for the 2nd half. */
2865 frame_register_read (selected_frame
, i
+ 1, raw_buf
);
2867 /* Copy it into the appropriate part of the virtual buffer. */
2868 memcpy (virtual_buffer
+ REGISTER_RAW_SIZE (i
), raw_buf
, REGISTER_RAW_SIZE (i
));
2870 val_print (builtin_type_double
, virtual_buffer
, 0, 0, stream
, 0,
2871 1, 0, Val_pretty_default
);
2876 val_print (REGISTER_VIRTUAL_TYPE (i
), virtual_buffer
, 0, 0, stream
, 0,
2877 1, 0, Val_pretty_default
);
2882 /* Return one if PC is in the call path of a trampoline, else return zero.
2884 Note we return one for *any* call trampoline (long-call, arg-reloc), not
2885 just shared library trampolines (import, export). */
2888 in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
2890 struct minimal_symbol
*minsym
;
2891 struct unwind_table_entry
*u
;
2892 static CORE_ADDR dyncall
= 0;
2893 static CORE_ADDR sr4export
= 0;
2895 #ifdef GDB_TARGET_IS_HPPA_20W
2896 /* PA64 has a completely different stub/trampoline scheme. Is it
2897 better? Maybe. It's certainly harder to determine with any
2898 certainty that we are in a stub because we can not refer to the
2901 The heuristic is simple. Try to lookup the current PC value in th
2902 minimal symbol table. If that fails, then assume we are not in a
2905 Then see if the PC value falls within the section bounds for the
2906 section containing the minimal symbol we found in the first
2907 step. If it does, then assume we are not in a stub and return.
2909 Finally peek at the instructions to see if they look like a stub. */
2911 struct minimal_symbol
*minsym
;
2916 minsym
= lookup_minimal_symbol_by_pc (pc
);
2920 sec
= SYMBOL_BFD_SECTION (minsym
);
2923 && sec
->vma
+ sec
->_cooked_size
< pc
)
2926 /* We might be in a stub. Peek at the instructions. Stubs are 3
2927 instructions long. */
2928 insn
= read_memory_integer (pc
, 4);
2930 /* Find out where we think we are within the stub. */
2931 if ((insn
& 0xffffc00e) == 0x53610000)
2933 else if ((insn
& 0xffffffff) == 0xe820d000)
2935 else if ((insn
& 0xffffc00e) == 0x537b0000)
2940 /* Now verify each insn in the range looks like a stub instruction. */
2941 insn
= read_memory_integer (addr
, 4);
2942 if ((insn
& 0xffffc00e) != 0x53610000)
2945 /* Now verify each insn in the range looks like a stub instruction. */
2946 insn
= read_memory_integer (addr
+ 4, 4);
2947 if ((insn
& 0xffffffff) != 0xe820d000)
2950 /* Now verify each insn in the range looks like a stub instruction. */
2951 insn
= read_memory_integer (addr
+ 8, 4);
2952 if ((insn
& 0xffffc00e) != 0x537b0000)
2955 /* Looks like a stub. */
2960 /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a
2963 /* First see if PC is in one of the two C-library trampolines. */
2966 minsym
= lookup_minimal_symbol ("$$dyncall", NULL
, NULL
);
2968 dyncall
= SYMBOL_VALUE_ADDRESS (minsym
);
2975 minsym
= lookup_minimal_symbol ("_sr4export", NULL
, NULL
);
2977 sr4export
= SYMBOL_VALUE_ADDRESS (minsym
);
2982 if (pc
== dyncall
|| pc
== sr4export
)
2985 minsym
= lookup_minimal_symbol_by_pc (pc
);
2986 if (minsym
&& strcmp (SYMBOL_NAME (minsym
), ".stub") == 0)
2989 /* Get the unwind descriptor corresponding to PC, return zero
2990 if no unwind was found. */
2991 u
= find_unwind_entry (pc
);
2995 /* If this isn't a linker stub, then return now. */
2996 if (u
->stub_unwind
.stub_type
== 0)
2999 /* By definition a long-branch stub is a call stub. */
3000 if (u
->stub_unwind
.stub_type
== LONG_BRANCH
)
3003 /* The call and return path execute the same instructions within
3004 an IMPORT stub! So an IMPORT stub is both a call and return
3006 if (u
->stub_unwind
.stub_type
== IMPORT
)
3009 /* Parameter relocation stubs always have a call path and may have a
3011 if (u
->stub_unwind
.stub_type
== PARAMETER_RELOCATION
3012 || u
->stub_unwind
.stub_type
== EXPORT
)
3016 /* Search forward from the current PC until we hit a branch
3017 or the end of the stub. */
3018 for (addr
= pc
; addr
<= u
->region_end
; addr
+= 4)
3022 insn
= read_memory_integer (addr
, 4);
3024 /* Does it look like a bl? If so then it's the call path, if
3025 we find a bv or be first, then we're on the return path. */
3026 if ((insn
& 0xfc00e000) == 0xe8000000)
3028 else if ((insn
& 0xfc00e001) == 0xe800c000
3029 || (insn
& 0xfc000000) == 0xe0000000)
3033 /* Should never happen. */
3034 warning ("Unable to find branch in parameter relocation stub.\n");
3038 /* Unknown stub type. For now, just return zero. */
3042 /* Return one if PC is in the return path of a trampoline, else return zero.
3044 Note we return one for *any* call trampoline (long-call, arg-reloc), not
3045 just shared library trampolines (import, export). */
3048 in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
3050 struct unwind_table_entry
*u
;
3052 /* Get the unwind descriptor corresponding to PC, return zero
3053 if no unwind was found. */
3054 u
= find_unwind_entry (pc
);
3058 /* If this isn't a linker stub or it's just a long branch stub, then
3060 if (u
->stub_unwind
.stub_type
== 0 || u
->stub_unwind
.stub_type
== LONG_BRANCH
)
3063 /* The call and return path execute the same instructions within
3064 an IMPORT stub! So an IMPORT stub is both a call and return
3066 if (u
->stub_unwind
.stub_type
== IMPORT
)
3069 /* Parameter relocation stubs always have a call path and may have a
3071 if (u
->stub_unwind
.stub_type
== PARAMETER_RELOCATION
3072 || u
->stub_unwind
.stub_type
== EXPORT
)
3076 /* Search forward from the current PC until we hit a branch
3077 or the end of the stub. */
3078 for (addr
= pc
; addr
<= u
->region_end
; addr
+= 4)
3082 insn
= read_memory_integer (addr
, 4);
3084 /* Does it look like a bl? If so then it's the call path, if
3085 we find a bv or be first, then we're on the return path. */
3086 if ((insn
& 0xfc00e000) == 0xe8000000)
3088 else if ((insn
& 0xfc00e001) == 0xe800c000
3089 || (insn
& 0xfc000000) == 0xe0000000)
3093 /* Should never happen. */
3094 warning ("Unable to find branch in parameter relocation stub.\n");
3098 /* Unknown stub type. For now, just return zero. */
3103 /* Figure out if PC is in a trampoline, and if so find out where
3104 the trampoline will jump to. If not in a trampoline, return zero.
3106 Simple code examination probably is not a good idea since the code
3107 sequences in trampolines can also appear in user code.
3109 We use unwinds and information from the minimal symbol table to
3110 determine when we're in a trampoline. This won't work for ELF
3111 (yet) since it doesn't create stub unwind entries. Whether or
3112 not ELF will create stub unwinds or normal unwinds for linker
3113 stubs is still being debated.
3115 This should handle simple calls through dyncall or sr4export,
3116 long calls, argument relocation stubs, and dyncall/sr4export
3117 calling an argument relocation stub. It even handles some stubs
3118 used in dynamic executables. */
3121 skip_trampoline_code (CORE_ADDR pc
, char *name
)
3124 long prev_inst
, curr_inst
, loc
;
3125 static CORE_ADDR dyncall
= 0;
3126 static CORE_ADDR dyncall_external
= 0;
3127 static CORE_ADDR sr4export
= 0;
3128 struct minimal_symbol
*msym
;
3129 struct unwind_table_entry
*u
;
3131 /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a
3136 msym
= lookup_minimal_symbol ("$$dyncall", NULL
, NULL
);
3138 dyncall
= SYMBOL_VALUE_ADDRESS (msym
);
3143 if (!dyncall_external
)
3145 msym
= lookup_minimal_symbol ("$$dyncall_external", NULL
, NULL
);
3147 dyncall_external
= SYMBOL_VALUE_ADDRESS (msym
);
3149 dyncall_external
= -1;
3154 msym
= lookup_minimal_symbol ("_sr4export", NULL
, NULL
);
3156 sr4export
= SYMBOL_VALUE_ADDRESS (msym
);
3161 /* Addresses passed to dyncall may *NOT* be the actual address
3162 of the function. So we may have to do something special. */
3165 pc
= (CORE_ADDR
) read_register (22);
3167 /* If bit 30 (counting from the left) is on, then pc is the address of
3168 the PLT entry for this function, not the address of the function
3169 itself. Bit 31 has meaning too, but only for MPE. */
3171 pc
= (CORE_ADDR
) read_memory_integer (pc
& ~0x3, TARGET_PTR_BIT
/ 8);
3173 if (pc
== dyncall_external
)
3175 pc
= (CORE_ADDR
) read_register (22);
3176 pc
= (CORE_ADDR
) read_memory_integer (pc
& ~0x3, TARGET_PTR_BIT
/ 8);
3178 else if (pc
== sr4export
)
3179 pc
= (CORE_ADDR
) (read_register (22));
3181 /* Get the unwind descriptor corresponding to PC, return zero
3182 if no unwind was found. */
3183 u
= find_unwind_entry (pc
);
3187 /* If this isn't a linker stub, then return now. */
3188 /* elz: attention here! (FIXME) because of a compiler/linker
3189 error, some stubs which should have a non zero stub_unwind.stub_type
3190 have unfortunately a value of zero. So this function would return here
3191 as if we were not in a trampoline. To fix this, we go look at the partial
3192 symbol information, which reports this guy as a stub.
3193 (FIXME): Unfortunately, we are not that lucky: it turns out that the
3194 partial symbol information is also wrong sometimes. This is because
3195 when it is entered (somread.c::som_symtab_read()) it can happen that
3196 if the type of the symbol (from the som) is Entry, and the symbol is
3197 in a shared library, then it can also be a trampoline. This would
3198 be OK, except that I believe the way they decide if we are ina shared library
3199 does not work. SOOOO..., even if we have a regular function w/o trampolines
3200 its minimal symbol can be assigned type mst_solib_trampoline.
3201 Also, if we find that the symbol is a real stub, then we fix the unwind
3202 descriptor, and define the stub type to be EXPORT.
3203 Hopefully this is correct most of the times. */
3204 if (u
->stub_unwind
.stub_type
== 0)
3207 /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed
3208 we can delete all the code which appears between the lines */
3209 /*--------------------------------------------------------------------------*/
3210 msym
= lookup_minimal_symbol_by_pc (pc
);
3212 if (msym
== NULL
|| MSYMBOL_TYPE (msym
) != mst_solib_trampoline
)
3213 return orig_pc
== pc
? 0 : pc
& ~0x3;
3215 else if (msym
!= NULL
&& MSYMBOL_TYPE (msym
) == mst_solib_trampoline
)
3217 struct objfile
*objfile
;
3218 struct minimal_symbol
*msymbol
;
3219 int function_found
= 0;
3221 /* go look if there is another minimal symbol with the same name as
3222 this one, but with type mst_text. This would happen if the msym
3223 is an actual trampoline, in which case there would be another
3224 symbol with the same name corresponding to the real function */
3226 ALL_MSYMBOLS (objfile
, msymbol
)
3228 if (MSYMBOL_TYPE (msymbol
) == mst_text
3229 && STREQ (SYMBOL_NAME (msymbol
), SYMBOL_NAME (msym
)))
3237 /* the type of msym is correct (mst_solib_trampoline), but
3238 the unwind info is wrong, so set it to the correct value */
3239 u
->stub_unwind
.stub_type
= EXPORT
;
3241 /* the stub type info in the unwind is correct (this is not a
3242 trampoline), but the msym type information is wrong, it
3243 should be mst_text. So we need to fix the msym, and also
3244 get out of this function */
3246 MSYMBOL_TYPE (msym
) = mst_text
;
3247 return orig_pc
== pc
? 0 : pc
& ~0x3;
3251 /*--------------------------------------------------------------------------*/
3254 /* It's a stub. Search for a branch and figure out where it goes.
3255 Note we have to handle multi insn branch sequences like ldil;ble.
3256 Most (all?) other branches can be determined by examining the contents
3257 of certain registers and the stack. */
3264 /* Make sure we haven't walked outside the range of this stub. */
3265 if (u
!= find_unwind_entry (loc
))
3267 warning ("Unable to find branch in linker stub");
3268 return orig_pc
== pc
? 0 : pc
& ~0x3;
3271 prev_inst
= curr_inst
;
3272 curr_inst
= read_memory_integer (loc
, 4);
3274 /* Does it look like a branch external using %r1? Then it's the
3275 branch from the stub to the actual function. */
3276 if ((curr_inst
& 0xffe0e000) == 0xe0202000)
3278 /* Yup. See if the previous instruction loaded
3279 a value into %r1. If so compute and return the jump address. */
3280 if ((prev_inst
& 0xffe00000) == 0x20200000)
3281 return (extract_21 (prev_inst
) + extract_17 (curr_inst
)) & ~0x3;
3284 warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1).");
3285 return orig_pc
== pc
? 0 : pc
& ~0x3;
3289 /* Does it look like a be 0(sr0,%r21)? OR
3290 Does it look like a be, n 0(sr0,%r21)? OR
3291 Does it look like a bve (r21)? (this is on PA2.0)
3292 Does it look like a bve, n(r21)? (this is also on PA2.0)
3293 That's the branch from an
3294 import stub to an export stub.
3296 It is impossible to determine the target of the branch via
3297 simple examination of instructions and/or data (consider
3298 that the address in the plabel may be the address of the
3299 bind-on-reference routine in the dynamic loader).
3301 So we have try an alternative approach.
3303 Get the name of the symbol at our current location; it should
3304 be a stub symbol with the same name as the symbol in the
3307 Then lookup a minimal symbol with the same name; we should
3308 get the minimal symbol for the target routine in the shared
3309 library as those take precedence of import/export stubs. */
3310 if ((curr_inst
== 0xe2a00000) ||
3311 (curr_inst
== 0xe2a00002) ||
3312 (curr_inst
== 0xeaa0d000) ||
3313 (curr_inst
== 0xeaa0d002))
3315 struct minimal_symbol
*stubsym
, *libsym
;
3317 stubsym
= lookup_minimal_symbol_by_pc (loc
);
3318 if (stubsym
== NULL
)
3320 warning ("Unable to find symbol for 0x%lx", loc
);
3321 return orig_pc
== pc
? 0 : pc
& ~0x3;
3324 libsym
= lookup_minimal_symbol (SYMBOL_NAME (stubsym
), NULL
, NULL
);
3327 warning ("Unable to find library symbol for %s\n",
3328 SYMBOL_NAME (stubsym
));
3329 return orig_pc
== pc
? 0 : pc
& ~0x3;
3332 return SYMBOL_VALUE (libsym
);
3335 /* Does it look like bl X,%rp or bl X,%r0? Another way to do a
3336 branch from the stub to the actual function. */
3338 else if ((curr_inst
& 0xffe0e000) == 0xe8400000
3339 || (curr_inst
& 0xffe0e000) == 0xe8000000
3340 || (curr_inst
& 0xffe0e000) == 0xe800A000)
3341 return (loc
+ extract_17 (curr_inst
) + 8) & ~0x3;
3343 /* Does it look like bv (rp)? Note this depends on the
3344 current stack pointer being the same as the stack
3345 pointer in the stub itself! This is a branch on from the
3346 stub back to the original caller. */
3347 /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */
3348 else if ((curr_inst
& 0xffe0f000) == 0xe840c000)
3350 /* Yup. See if the previous instruction loaded
3352 if (prev_inst
== 0x4bc23ff1)
3353 return (read_memory_integer
3354 (read_register (SP_REGNUM
) - 8, 4)) & ~0x3;
3357 warning ("Unable to find restore of %%rp before bv (%%rp).");
3358 return orig_pc
== pc
? 0 : pc
& ~0x3;
3362 /* elz: added this case to capture the new instruction
3363 at the end of the return part of an export stub used by
3364 the PA2.0: BVE, n (rp) */
3365 else if ((curr_inst
& 0xffe0f000) == 0xe840d000)
3367 return (read_memory_integer
3368 (read_register (SP_REGNUM
) - 24, TARGET_PTR_BIT
/ 8)) & ~0x3;
3371 /* What about be,n 0(sr0,%rp)? It's just another way we return to
3372 the original caller from the stub. Used in dynamic executables. */
3373 else if (curr_inst
== 0xe0400002)
3375 /* The value we jump to is sitting in sp - 24. But that's
3376 loaded several instructions before the be instruction.
3377 I guess we could check for the previous instruction being
3378 mtsp %r1,%sr0 if we want to do sanity checking. */
3379 return (read_memory_integer
3380 (read_register (SP_REGNUM
) - 24, TARGET_PTR_BIT
/ 8)) & ~0x3;
3383 /* Haven't found the branch yet, but we're still in the stub.
3390 /* For the given instruction (INST), return any adjustment it makes
3391 to the stack pointer or zero for no adjustment.
3393 This only handles instructions commonly found in prologues. */
3396 prologue_inst_adjust_sp (unsigned long inst
)
3398 /* This must persist across calls. */
3399 static int save_high21
;
3401 /* The most common way to perform a stack adjustment ldo X(sp),sp */
3402 if ((inst
& 0xffffc000) == 0x37de0000)
3403 return extract_14 (inst
);
3406 if ((inst
& 0xffe00000) == 0x6fc00000)
3407 return extract_14 (inst
);
3409 /* std,ma X,D(sp) */
3410 if ((inst
& 0xffe00008) == 0x73c00008)
3411 return (inst
& 0x1 ? -1 << 13 : 0) | (((inst
>> 4) & 0x3ff) << 3);
3413 /* addil high21,%r1; ldo low11,(%r1),%r30)
3414 save high bits in save_high21 for later use. */
3415 if ((inst
& 0xffe00000) == 0x28200000)
3417 save_high21
= extract_21 (inst
);
3421 if ((inst
& 0xffff0000) == 0x343e0000)
3422 return save_high21
+ extract_14 (inst
);
3424 /* fstws as used by the HP compilers. */
3425 if ((inst
& 0xffffffe0) == 0x2fd01220)
3426 return extract_5_load (inst
);
3428 /* No adjustment. */
3432 /* Return nonzero if INST is a branch of some kind, else return zero. */
3435 is_branch (unsigned long inst
)
3464 /* Return the register number for a GR which is saved by INST or
3465 zero it INST does not save a GR. */
3468 inst_saves_gr (unsigned long inst
)
3470 /* Does it look like a stw? */
3471 if ((inst
>> 26) == 0x1a || (inst
>> 26) == 0x1b
3472 || (inst
>> 26) == 0x1f
3473 || ((inst
>> 26) == 0x1f
3474 && ((inst
>> 6) == 0xa)))
3475 return extract_5R_store (inst
);
3477 /* Does it look like a std? */
3478 if ((inst
>> 26) == 0x1c
3479 || ((inst
>> 26) == 0x03
3480 && ((inst
>> 6) & 0xf) == 0xb))
3481 return extract_5R_store (inst
);
3483 /* Does it look like a stwm? GCC & HPC may use this in prologues. */
3484 if ((inst
>> 26) == 0x1b)
3485 return extract_5R_store (inst
);
3487 /* Does it look like sth or stb? HPC versions 9.0 and later use these
3489 if ((inst
>> 26) == 0x19 || (inst
>> 26) == 0x18
3490 || ((inst
>> 26) == 0x3
3491 && (((inst
>> 6) & 0xf) == 0x8
3492 || (inst
>> 6) & 0xf) == 0x9))
3493 return extract_5R_store (inst
);
3498 /* Return the register number for a FR which is saved by INST or
3499 zero it INST does not save a FR.
3501 Note we only care about full 64bit register stores (that's the only
3502 kind of stores the prologue will use).
3504 FIXME: What about argument stores with the HP compiler in ANSI mode? */
3507 inst_saves_fr (unsigned long inst
)
3509 /* is this an FSTD ? */
3510 if ((inst
& 0xfc00dfc0) == 0x2c001200)
3511 return extract_5r_store (inst
);
3512 if ((inst
& 0xfc000002) == 0x70000002)
3513 return extract_5R_store (inst
);
3514 /* is this an FSTW ? */
3515 if ((inst
& 0xfc00df80) == 0x24001200)
3516 return extract_5r_store (inst
);
3517 if ((inst
& 0xfc000002) == 0x7c000000)
3518 return extract_5R_store (inst
);
3522 /* Advance PC across any function entry prologue instructions
3523 to reach some "real" code.
3525 Use information in the unwind table to determine what exactly should
3526 be in the prologue. */
3530 skip_prologue_hard_way (CORE_ADDR pc
)
3533 CORE_ADDR orig_pc
= pc
;
3534 unsigned long inst
, stack_remaining
, save_gr
, save_fr
, save_rp
, save_sp
;
3535 unsigned long args_stored
, status
, i
, restart_gr
, restart_fr
;
3536 struct unwind_table_entry
*u
;
3542 u
= find_unwind_entry (pc
);
3546 /* If we are not at the beginning of a function, then return now. */
3547 if ((pc
& ~0x3) != u
->region_start
)
3550 /* This is how much of a frame adjustment we need to account for. */
3551 stack_remaining
= u
->Total_frame_size
<< 3;
3553 /* Magic register saves we want to know about. */
3554 save_rp
= u
->Save_RP
;
3555 save_sp
= u
->Save_SP
;
3557 /* An indication that args may be stored into the stack. Unfortunately
3558 the HPUX compilers tend to set this in cases where no args were
3562 /* Turn the Entry_GR field into a bitmask. */
3564 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
3566 /* Frame pointer gets saved into a special location. */
3567 if (u
->Save_SP
&& i
== FP_REGNUM
)
3570 save_gr
|= (1 << i
);
3572 save_gr
&= ~restart_gr
;
3574 /* Turn the Entry_FR field into a bitmask too. */
3576 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
3577 save_fr
|= (1 << i
);
3578 save_fr
&= ~restart_fr
;
3580 /* Loop until we find everything of interest or hit a branch.
3582 For unoptimized GCC code and for any HP CC code this will never ever
3583 examine any user instructions.
3585 For optimzied GCC code we're faced with problems. GCC will schedule
3586 its prologue and make prologue instructions available for delay slot
3587 filling. The end result is user code gets mixed in with the prologue
3588 and a prologue instruction may be in the delay slot of the first branch
3591 Some unexpected things are expected with debugging optimized code, so
3592 we allow this routine to walk past user instructions in optimized
3594 while (save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0
3597 unsigned int reg_num
;
3598 unsigned long old_stack_remaining
, old_save_gr
, old_save_fr
;
3599 unsigned long old_save_rp
, old_save_sp
, next_inst
;
3601 /* Save copies of all the triggers so we can compare them later
3603 old_save_gr
= save_gr
;
3604 old_save_fr
= save_fr
;
3605 old_save_rp
= save_rp
;
3606 old_save_sp
= save_sp
;
3607 old_stack_remaining
= stack_remaining
;
3609 status
= target_read_memory (pc
, buf
, 4);
3610 inst
= extract_unsigned_integer (buf
, 4);
3616 /* Note the interesting effects of this instruction. */
3617 stack_remaining
-= prologue_inst_adjust_sp (inst
);
3619 /* There are limited ways to store the return pointer into the
3621 if (inst
== 0x6bc23fd9 || inst
== 0x0fc212c1)
3624 /* These are the only ways we save SP into the stack. At this time
3625 the HP compilers never bother to save SP into the stack. */
3626 if ((inst
& 0xffffc000) == 0x6fc10000
3627 || (inst
& 0xffffc00c) == 0x73c10008)
3630 /* Are we loading some register with an offset from the argument
3632 if ((inst
& 0xffe00000) == 0x37a00000
3633 || (inst
& 0xffffffe0) == 0x081d0240)
3639 /* Account for general and floating-point register saves. */
3640 reg_num
= inst_saves_gr (inst
);
3641 save_gr
&= ~(1 << reg_num
);
3643 /* Ugh. Also account for argument stores into the stack.
3644 Unfortunately args_stored only tells us that some arguments
3645 where stored into the stack. Not how many or what kind!
3647 This is a kludge as on the HP compiler sets this bit and it
3648 never does prologue scheduling. So once we see one, skip past
3649 all of them. We have similar code for the fp arg stores below.
3651 FIXME. Can still die if we have a mix of GR and FR argument
3653 if (reg_num
>= (TARGET_PTR_BIT
== 64 ? 19 : 23) && reg_num
<= 26)
3655 while (reg_num
>= (TARGET_PTR_BIT
== 64 ? 19 : 23) && reg_num
<= 26)
3658 status
= target_read_memory (pc
, buf
, 4);
3659 inst
= extract_unsigned_integer (buf
, 4);
3662 reg_num
= inst_saves_gr (inst
);
3668 reg_num
= inst_saves_fr (inst
);
3669 save_fr
&= ~(1 << reg_num
);
3671 status
= target_read_memory (pc
+ 4, buf
, 4);
3672 next_inst
= extract_unsigned_integer (buf
, 4);
3678 /* We've got to be read to handle the ldo before the fp register
3680 if ((inst
& 0xfc000000) == 0x34000000
3681 && inst_saves_fr (next_inst
) >= 4
3682 && inst_saves_fr (next_inst
) <= (TARGET_PTR_BIT
== 64 ? 11 : 7))
3684 /* So we drop into the code below in a reasonable state. */
3685 reg_num
= inst_saves_fr (next_inst
);
3689 /* Ugh. Also account for argument stores into the stack.
3690 This is a kludge as on the HP compiler sets this bit and it
3691 never does prologue scheduling. So once we see one, skip past
3693 if (reg_num
>= 4 && reg_num
<= (TARGET_PTR_BIT
== 64 ? 11 : 7))
3695 while (reg_num
>= 4 && reg_num
<= (TARGET_PTR_BIT
== 64 ? 11 : 7))
3698 status
= target_read_memory (pc
, buf
, 4);
3699 inst
= extract_unsigned_integer (buf
, 4);
3702 if ((inst
& 0xfc000000) != 0x34000000)
3704 status
= target_read_memory (pc
+ 4, buf
, 4);
3705 next_inst
= extract_unsigned_integer (buf
, 4);
3708 reg_num
= inst_saves_fr (next_inst
);
3714 /* Quit if we hit any kind of branch. This can happen if a prologue
3715 instruction is in the delay slot of the first call/branch. */
3716 if (is_branch (inst
))
3719 /* What a crock. The HP compilers set args_stored even if no
3720 arguments were stored into the stack (boo hiss). This could
3721 cause this code to then skip a bunch of user insns (up to the
3724 To combat this we try to identify when args_stored was bogusly
3725 set and clear it. We only do this when args_stored is nonzero,
3726 all other resources are accounted for, and nothing changed on
3729 && !(save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0)
3730 && old_save_gr
== save_gr
&& old_save_fr
== save_fr
3731 && old_save_rp
== save_rp
&& old_save_sp
== save_sp
3732 && old_stack_remaining
== stack_remaining
)
3739 /* We've got a tenative location for the end of the prologue. However
3740 because of limitations in the unwind descriptor mechanism we may
3741 have went too far into user code looking for the save of a register
3742 that does not exist. So, if there registers we expected to be saved
3743 but never were, mask them out and restart.
3745 This should only happen in optimized code, and should be very rare. */
3746 if (save_gr
|| (save_fr
&& !(restart_fr
|| restart_gr
)))
3749 restart_gr
= save_gr
;
3750 restart_fr
= save_fr
;
3758 /* Return the address of the PC after the last prologue instruction if
3759 we can determine it from the debug symbols. Else return zero. */
3762 after_prologue (CORE_ADDR pc
)
3764 struct symtab_and_line sal
;
3765 CORE_ADDR func_addr
, func_end
;
3768 /* If we can not find the symbol in the partial symbol table, then
3769 there is no hope we can determine the function's start address
3771 if (!find_pc_partial_function (pc
, NULL
, &func_addr
, &func_end
))
3774 /* Get the line associated with FUNC_ADDR. */
3775 sal
= find_pc_line (func_addr
, 0);
3777 /* There are only two cases to consider. First, the end of the source line
3778 is within the function bounds. In that case we return the end of the
3779 source line. Second is the end of the source line extends beyond the
3780 bounds of the current function. We need to use the slow code to
3781 examine instructions in that case.
3783 Anything else is simply a bug elsewhere. Fixing it here is absolutely
3784 the wrong thing to do. In fact, it should be entirely possible for this
3785 function to always return zero since the slow instruction scanning code
3786 is supposed to *always* work. If it does not, then it is a bug. */
3787 if (sal
.end
< func_end
)
3793 /* To skip prologues, I use this predicate. Returns either PC itself
3794 if the code at PC does not look like a function prologue; otherwise
3795 returns an address that (if we're lucky) follows the prologue. If
3796 LENIENT, then we must skip everything which is involved in setting
3797 up the frame (it's OK to skip more, just so long as we don't skip
3798 anything which might clobber the registers which are being saved.
3799 Currently we must not skip more on the alpha, but we might the lenient
3803 hppa_skip_prologue (CORE_ADDR pc
)
3807 CORE_ADDR post_prologue_pc
;
3810 /* See if we can determine the end of the prologue via the symbol table.
3811 If so, then return either PC, or the PC after the prologue, whichever
3814 post_prologue_pc
= after_prologue (pc
);
3816 /* If after_prologue returned a useful address, then use it. Else
3817 fall back on the instruction skipping code.
3819 Some folks have claimed this causes problems because the breakpoint
3820 may be the first instruction of the prologue. If that happens, then
3821 the instruction skipping code has a bug that needs to be fixed. */
3822 if (post_prologue_pc
!= 0)
3823 return max (pc
, post_prologue_pc
);
3825 return (skip_prologue_hard_way (pc
));
3828 /* Put here the code to store, into a struct frame_saved_regs,
3829 the addresses of the saved registers of frame described by FRAME_INFO.
3830 This includes special registers such as pc and fp saved in special
3831 ways in the stack frame. sp is even more special:
3832 the address we return for it IS the sp for the next frame. */
3835 hppa_frame_find_saved_regs (struct frame_info
*frame_info
,
3836 struct frame_saved_regs
*frame_saved_regs
)
3839 struct unwind_table_entry
*u
;
3840 unsigned long inst
, stack_remaining
, save_gr
, save_fr
, save_rp
, save_sp
;
3844 int final_iteration
;
3846 /* Zero out everything. */
3847 memset (frame_saved_regs
, '\0', sizeof (struct frame_saved_regs
));
3849 /* Call dummy frames always look the same, so there's no need to
3850 examine the dummy code to determine locations of saved registers;
3851 instead, let find_dummy_frame_regs fill in the correct offsets
3852 for the saved registers. */
3853 if ((frame_info
->pc
>= frame_info
->frame
3854 && frame_info
->pc
<= (frame_info
->frame
3855 /* A call dummy is sized in words, but it is
3856 actually a series of instructions. Account
3857 for that scaling factor. */
3858 + ((REGISTER_SIZE
/ INSTRUCTION_SIZE
)
3859 * CALL_DUMMY_LENGTH
)
3860 /* Similarly we have to account for 64bit
3861 wide register saves. */
3862 + (32 * REGISTER_SIZE
)
3863 /* We always consider FP regs 8 bytes long. */
3864 + (NUM_REGS
- FP0_REGNUM
) * 8
3865 /* Similarly we have to account for 64bit
3866 wide register saves. */
3867 + (6 * REGISTER_SIZE
))))
3868 find_dummy_frame_regs (frame_info
, frame_saved_regs
);
3870 /* Interrupt handlers are special too. They lay out the register
3871 state in the exact same order as the register numbers in GDB. */
3872 if (pc_in_interrupt_handler (frame_info
->pc
))
3874 for (i
= 0; i
< NUM_REGS
; i
++)
3876 /* SP is a little special. */
3878 frame_saved_regs
->regs
[SP_REGNUM
]
3879 = read_memory_integer (frame_info
->frame
+ SP_REGNUM
* 4,
3880 TARGET_PTR_BIT
/ 8);
3882 frame_saved_regs
->regs
[i
] = frame_info
->frame
+ i
* 4;
3887 #ifdef FRAME_FIND_SAVED_REGS_IN_SIGTRAMP
3888 /* Handle signal handler callers. */
3889 if (frame_info
->signal_handler_caller
)
3891 FRAME_FIND_SAVED_REGS_IN_SIGTRAMP (frame_info
, frame_saved_regs
);
3896 /* Get the starting address of the function referred to by the PC
3898 pc
= get_pc_function_start (frame_info
->pc
);
3901 u
= find_unwind_entry (pc
);
3905 /* This is how much of a frame adjustment we need to account for. */
3906 stack_remaining
= u
->Total_frame_size
<< 3;
3908 /* Magic register saves we want to know about. */
3909 save_rp
= u
->Save_RP
;
3910 save_sp
= u
->Save_SP
;
3912 /* Turn the Entry_GR field into a bitmask. */
3914 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
3916 /* Frame pointer gets saved into a special location. */
3917 if (u
->Save_SP
&& i
== FP_REGNUM
)
3920 save_gr
|= (1 << i
);
3923 /* Turn the Entry_FR field into a bitmask too. */
3925 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
3926 save_fr
|= (1 << i
);
3928 /* The frame always represents the value of %sp at entry to the
3929 current function (and is thus equivalent to the "saved" stack
3931 frame_saved_regs
->regs
[SP_REGNUM
] = frame_info
->frame
;
3933 /* Loop until we find everything of interest or hit a branch.
3935 For unoptimized GCC code and for any HP CC code this will never ever
3936 examine any user instructions.
3938 For optimized GCC code we're faced with problems. GCC will schedule
3939 its prologue and make prologue instructions available for delay slot
3940 filling. The end result is user code gets mixed in with the prologue
3941 and a prologue instruction may be in the delay slot of the first branch
3944 Some unexpected things are expected with debugging optimized code, so
3945 we allow this routine to walk past user instructions in optimized
3947 final_iteration
= 0;
3948 while ((save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0)
3949 && pc
<= frame_info
->pc
)
3951 status
= target_read_memory (pc
, buf
, 4);
3952 inst
= extract_unsigned_integer (buf
, 4);
3958 /* Note the interesting effects of this instruction. */
3959 stack_remaining
-= prologue_inst_adjust_sp (inst
);
3961 /* There are limited ways to store the return pointer into the
3963 if (inst
== 0x6bc23fd9) /* stw rp,-0x14(sr0,sp) */
3966 frame_saved_regs
->regs
[RP_REGNUM
] = frame_info
->frame
- 20;
3968 else if (inst
== 0x0fc212c1) /* std rp,-0x10(sr0,sp) */
3971 frame_saved_regs
->regs
[RP_REGNUM
] = frame_info
->frame
- 16;
3974 /* Note if we saved SP into the stack. This also happens to indicate
3975 the location of the saved frame pointer. */
3976 if ( (inst
& 0xffffc000) == 0x6fc10000 /* stw,ma r1,N(sr0,sp) */
3977 || (inst
& 0xffffc00c) == 0x73c10008) /* std,ma r1,N(sr0,sp) */
3979 frame_saved_regs
->regs
[FP_REGNUM
] = frame_info
->frame
;
3983 /* Account for general and floating-point register saves. */
3984 reg
= inst_saves_gr (inst
);
3985 if (reg
>= 3 && reg
<= 18
3986 && (!u
->Save_SP
|| reg
!= FP_REGNUM
))
3988 save_gr
&= ~(1 << reg
);
3990 /* stwm with a positive displacement is a *post modify*. */
3991 if ((inst
>> 26) == 0x1b
3992 && extract_14 (inst
) >= 0)
3993 frame_saved_regs
->regs
[reg
] = frame_info
->frame
;
3994 /* A std has explicit post_modify forms. */
3995 else if ((inst
& 0xfc00000c0) == 0x70000008)
3996 frame_saved_regs
->regs
[reg
] = frame_info
->frame
;
4001 if ((inst
>> 26) == 0x1c)
4002 offset
= (inst
& 0x1 ? -1 << 13 : 0) | (((inst
>> 4) & 0x3ff) << 3);
4003 else if ((inst
>> 26) == 0x03)
4004 offset
= low_sign_extend (inst
& 0x1f, 5);
4006 offset
= extract_14 (inst
);
4008 /* Handle code with and without frame pointers. */
4010 frame_saved_regs
->regs
[reg
]
4011 = frame_info
->frame
+ offset
;
4013 frame_saved_regs
->regs
[reg
]
4014 = (frame_info
->frame
+ (u
->Total_frame_size
<< 3)
4020 /* GCC handles callee saved FP regs a little differently.
4022 It emits an instruction to put the value of the start of
4023 the FP store area into %r1. It then uses fstds,ma with
4024 a basereg of %r1 for the stores.
4026 HP CC emits them at the current stack pointer modifying
4027 the stack pointer as it stores each register. */
4029 /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */
4030 if ((inst
& 0xffffc000) == 0x34610000
4031 || (inst
& 0xffffc000) == 0x37c10000)
4032 fp_loc
= extract_14 (inst
);
4034 reg
= inst_saves_fr (inst
);
4035 if (reg
>= 12 && reg
<= 21)
4037 /* Note +4 braindamage below is necessary because the FP status
4038 registers are internally 8 registers rather than the expected
4040 save_fr
&= ~(1 << reg
);
4043 /* 1st HP CC FP register store. After this instruction
4044 we've set enough state that the GCC and HPCC code are
4045 both handled in the same manner. */
4046 frame_saved_regs
->regs
[reg
+ FP4_REGNUM
+ 4] = frame_info
->frame
;
4051 frame_saved_regs
->regs
[reg
+ FP0_REGNUM
+ 4]
4052 = frame_info
->frame
+ fp_loc
;
4057 /* Quit if we hit any kind of branch the previous iteration. */
4058 if (final_iteration
)
4061 /* We want to look precisely one instruction beyond the branch
4062 if we have not found everything yet. */
4063 if (is_branch (inst
))
4064 final_iteration
= 1;
4072 /* Exception handling support for the HP-UX ANSI C++ compiler.
4073 The compiler (aCC) provides a callback for exception events;
4074 GDB can set a breakpoint on this callback and find out what
4075 exception event has occurred. */
4077 /* The name of the hook to be set to point to the callback function */
4078 static char HP_ACC_EH_notify_hook
[] = "__eh_notify_hook";
4079 /* The name of the function to be used to set the hook value */
4080 static char HP_ACC_EH_set_hook_value
[] = "__eh_set_hook_value";
4081 /* The name of the callback function in end.o */
4082 static char HP_ACC_EH_notify_callback
[] = "__d_eh_notify_callback";
4083 /* Name of function in end.o on which a break is set (called by above) */
4084 static char HP_ACC_EH_break
[] = "__d_eh_break";
4085 /* Name of flag (in end.o) that enables catching throws */
4086 static char HP_ACC_EH_catch_throw
[] = "__d_eh_catch_throw";
4087 /* Name of flag (in end.o) that enables catching catching */
4088 static char HP_ACC_EH_catch_catch
[] = "__d_eh_catch_catch";
4089 /* The enum used by aCC */
4097 /* Is exception-handling support available with this executable? */
4098 static int hp_cxx_exception_support
= 0;
4099 /* Has the initialize function been run? */
4100 int hp_cxx_exception_support_initialized
= 0;
4101 /* Similar to above, but imported from breakpoint.c -- non-target-specific */
4102 extern int exception_support_initialized
;
4103 /* Address of __eh_notify_hook */
4104 static CORE_ADDR eh_notify_hook_addr
= 0;
4105 /* Address of __d_eh_notify_callback */
4106 static CORE_ADDR eh_notify_callback_addr
= 0;
4107 /* Address of __d_eh_break */
4108 static CORE_ADDR eh_break_addr
= 0;
4109 /* Address of __d_eh_catch_catch */
4110 static CORE_ADDR eh_catch_catch_addr
= 0;
4111 /* Address of __d_eh_catch_throw */
4112 static CORE_ADDR eh_catch_throw_addr
= 0;
4113 /* Sal for __d_eh_break */
4114 static struct symtab_and_line
*break_callback_sal
= 0;
4116 /* Code in end.c expects __d_pid to be set in the inferior,
4117 otherwise __d_eh_notify_callback doesn't bother to call
4118 __d_eh_break! So we poke the pid into this symbol
4123 setup_d_pid_in_inferior (void)
4126 struct minimal_symbol
*msymbol
;
4127 char buf
[4]; /* FIXME 32x64? */
4129 /* Slam the pid of the process into __d_pid; failing is only a warning! */
4130 msymbol
= lookup_minimal_symbol ("__d_pid", NULL
, symfile_objfile
);
4131 if (msymbol
== NULL
)
4133 warning ("Unable to find __d_pid symbol in object file.");
4134 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
4138 anaddr
= SYMBOL_VALUE_ADDRESS (msymbol
);
4139 store_unsigned_integer (buf
, 4, PIDGET (inferior_ptid
)); /* FIXME 32x64? */
4140 if (target_write_memory (anaddr
, buf
, 4)) /* FIXME 32x64? */
4142 warning ("Unable to write __d_pid");
4143 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
4149 /* Initialize exception catchpoint support by looking for the
4150 necessary hooks/callbacks in end.o, etc., and set the hook value to
4151 point to the required debug function
4157 initialize_hp_cxx_exception_support (void)
4159 struct symtabs_and_lines sals
;
4160 struct cleanup
*old_chain
;
4161 struct cleanup
*canonical_strings_chain
= NULL
;
4164 char *addr_end
= NULL
;
4165 char **canonical
= (char **) NULL
;
4167 struct symbol
*sym
= NULL
;
4168 struct minimal_symbol
*msym
= NULL
;
4169 struct objfile
*objfile
;
4170 asection
*shlib_info
;
4172 /* Detect and disallow recursion. On HP-UX with aCC, infinite
4173 recursion is a possibility because finding the hook for exception
4174 callbacks involves making a call in the inferior, which means
4175 re-inserting breakpoints which can re-invoke this code */
4177 static int recurse
= 0;
4180 hp_cxx_exception_support_initialized
= 0;
4181 exception_support_initialized
= 0;
4185 hp_cxx_exception_support
= 0;
4187 /* First check if we have seen any HP compiled objects; if not,
4188 it is very unlikely that HP's idiosyncratic callback mechanism
4189 for exception handling debug support will be available!
4190 This will percolate back up to breakpoint.c, where our callers
4191 will decide to try the g++ exception-handling support instead. */
4192 if (!hp_som_som_object_present
)
4195 /* We have a SOM executable with SOM debug info; find the hooks */
4197 /* First look for the notify hook provided by aCC runtime libs */
4198 /* If we find this symbol, we conclude that the executable must
4199 have HP aCC exception support built in. If this symbol is not
4200 found, even though we're a HP SOM-SOM file, we may have been
4201 built with some other compiler (not aCC). This results percolates
4202 back up to our callers in breakpoint.c which can decide to
4203 try the g++ style of exception support instead.
4204 If this symbol is found but the other symbols we require are
4205 not found, there is something weird going on, and g++ support
4206 should *not* be tried as an alternative.
4208 ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined.
4209 ASSUMPTION: HP aCC and g++ modules cannot be linked together. */
4211 /* libCsup has this hook; it'll usually be non-debuggable */
4212 msym
= lookup_minimal_symbol (HP_ACC_EH_notify_hook
, NULL
, NULL
);
4215 eh_notify_hook_addr
= SYMBOL_VALUE_ADDRESS (msym
);
4216 hp_cxx_exception_support
= 1;
4220 warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook
);
4221 warning ("Executable may not have been compiled debuggable with HP aCC.");
4222 warning ("GDB will be unable to intercept exception events.");
4223 eh_notify_hook_addr
= 0;
4224 hp_cxx_exception_support
= 0;
4228 /* Next look for the notify callback routine in end.o */
4229 /* This is always available in the SOM symbol dictionary if end.o is linked in */
4230 msym
= lookup_minimal_symbol (HP_ACC_EH_notify_callback
, NULL
, NULL
);
4233 eh_notify_callback_addr
= SYMBOL_VALUE_ADDRESS (msym
);
4234 hp_cxx_exception_support
= 1;
4238 warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback
);
4239 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
4240 warning ("GDB will be unable to intercept exception events.");
4241 eh_notify_callback_addr
= 0;
4245 #ifndef GDB_TARGET_IS_HPPA_20W
4246 /* Check whether the executable is dynamically linked or archive bound */
4247 /* With an archive-bound executable we can use the raw addresses we find
4248 for the callback function, etc. without modification. For an executable
4249 with shared libraries, we have to do more work to find the plabel, which
4250 can be the target of a call through $$dyncall from the aCC runtime support
4251 library (libCsup) which is linked shared by default by aCC. */
4252 /* This test below was copied from somsolib.c/somread.c. It may not be a very
4253 reliable one to test that an executable is linked shared. pai/1997-07-18 */
4254 shlib_info
= bfd_get_section_by_name (symfile_objfile
->obfd
, "$SHLIB_INFO$");
4255 if (shlib_info
&& (bfd_section_size (symfile_objfile
->obfd
, shlib_info
) != 0))
4257 /* The minsym we have has the local code address, but that's not the
4258 plabel that can be used by an inter-load-module call. */
4259 /* Find solib handle for main image (which has end.o), and use that
4260 and the min sym as arguments to __d_shl_get() (which does the equivalent
4261 of shl_findsym()) to find the plabel. */
4263 args_for_find_stub args
;
4264 static char message
[] = "Error while finding exception callback hook:\n";
4266 args
.solib_handle
= som_solib_get_solib_by_pc (eh_notify_callback_addr
);
4268 args
.return_val
= 0;
4271 catch_errors (cover_find_stub_with_shl_get
, (PTR
) &args
, message
,
4273 eh_notify_callback_addr
= args
.return_val
;
4276 exception_catchpoints_are_fragile
= 1;
4278 if (!eh_notify_callback_addr
)
4280 /* We can get here either if there is no plabel in the export list
4281 for the main image, or if something strange happened (?) */
4282 warning ("Couldn't find a plabel (indirect function label) for the exception callback.");
4283 warning ("GDB will not be able to intercept exception events.");
4288 exception_catchpoints_are_fragile
= 0;
4291 /* Now, look for the breakpointable routine in end.o */
4292 /* This should also be available in the SOM symbol dict. if end.o linked in */
4293 msym
= lookup_minimal_symbol (HP_ACC_EH_break
, NULL
, NULL
);
4296 eh_break_addr
= SYMBOL_VALUE_ADDRESS (msym
);
4297 hp_cxx_exception_support
= 1;
4301 warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break
);
4302 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
4303 warning ("GDB will be unable to intercept exception events.");
4308 /* Next look for the catch enable flag provided in end.o */
4309 sym
= lookup_symbol (HP_ACC_EH_catch_catch
, (struct block
*) NULL
,
4310 VAR_NAMESPACE
, 0, (struct symtab
**) NULL
);
4311 if (sym
) /* sometimes present in debug info */
4313 eh_catch_catch_addr
= SYMBOL_VALUE_ADDRESS (sym
);
4314 hp_cxx_exception_support
= 1;
4317 /* otherwise look in SOM symbol dict. */
4319 msym
= lookup_minimal_symbol (HP_ACC_EH_catch_catch
, NULL
, NULL
);
4322 eh_catch_catch_addr
= SYMBOL_VALUE_ADDRESS (msym
);
4323 hp_cxx_exception_support
= 1;
4327 warning ("Unable to enable interception of exception catches.");
4328 warning ("Executable may not have been compiled debuggable with HP aCC.");
4329 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
4334 /* Next look for the catch enable flag provided end.o */
4335 sym
= lookup_symbol (HP_ACC_EH_catch_catch
, (struct block
*) NULL
,
4336 VAR_NAMESPACE
, 0, (struct symtab
**) NULL
);
4337 if (sym
) /* sometimes present in debug info */
4339 eh_catch_throw_addr
= SYMBOL_VALUE_ADDRESS (sym
);
4340 hp_cxx_exception_support
= 1;
4343 /* otherwise look in SOM symbol dict. */
4345 msym
= lookup_minimal_symbol (HP_ACC_EH_catch_throw
, NULL
, NULL
);
4348 eh_catch_throw_addr
= SYMBOL_VALUE_ADDRESS (msym
);
4349 hp_cxx_exception_support
= 1;
4353 warning ("Unable to enable interception of exception throws.");
4354 warning ("Executable may not have been compiled debuggable with HP aCC.");
4355 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
4361 hp_cxx_exception_support
= 2; /* everything worked so far */
4362 hp_cxx_exception_support_initialized
= 1;
4363 exception_support_initialized
= 1;
4368 /* Target operation for enabling or disabling interception of
4370 KIND is either EX_EVENT_THROW or EX_EVENT_CATCH
4371 ENABLE is either 0 (disable) or 1 (enable).
4372 Return value is NULL if no support found;
4373 -1 if something went wrong,
4374 or a pointer to a symtab/line struct if the breakpointable
4375 address was found. */
4377 struct symtab_and_line
*
4378 child_enable_exception_callback (enum exception_event_kind kind
, int enable
)
4382 if (!exception_support_initialized
|| !hp_cxx_exception_support_initialized
)
4383 if (!initialize_hp_cxx_exception_support ())
4386 switch (hp_cxx_exception_support
)
4389 /* Assuming no HP support at all */
4392 /* HP support should be present, but something went wrong */
4393 return (struct symtab_and_line
*) -1; /* yuck! */
4394 /* there may be other cases in the future */
4397 /* Set the EH hook to point to the callback routine */
4398 store_unsigned_integer (buf
, 4, enable
? eh_notify_callback_addr
: 0); /* FIXME 32x64 problem */
4399 /* pai: (temp) FIXME should there be a pack operation first? */
4400 if (target_write_memory (eh_notify_hook_addr
, buf
, 4)) /* FIXME 32x64 problem */
4402 warning ("Could not write to target memory for exception event callback.");
4403 warning ("Interception of exception events may not work.");
4404 return (struct symtab_and_line
*) -1;
4408 /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */
4409 if (PIDGET (inferior_ptid
) > 0)
4411 if (setup_d_pid_in_inferior ())
4412 return (struct symtab_and_line
*) -1;
4416 warning ("Internal error: Invalid inferior pid? Cannot intercept exception events.");
4417 return (struct symtab_and_line
*) -1;
4423 case EX_EVENT_THROW
:
4424 store_unsigned_integer (buf
, 4, enable
? 1 : 0);
4425 if (target_write_memory (eh_catch_throw_addr
, buf
, 4)) /* FIXME 32x64? */
4427 warning ("Couldn't enable exception throw interception.");
4428 return (struct symtab_and_line
*) -1;
4431 case EX_EVENT_CATCH
:
4432 store_unsigned_integer (buf
, 4, enable
? 1 : 0);
4433 if (target_write_memory (eh_catch_catch_addr
, buf
, 4)) /* FIXME 32x64? */
4435 warning ("Couldn't enable exception catch interception.");
4436 return (struct symtab_and_line
*) -1;
4440 error ("Request to enable unknown or unsupported exception event.");
4443 /* Copy break address into new sal struct, malloc'ing if needed. */
4444 if (!break_callback_sal
)
4446 break_callback_sal
= (struct symtab_and_line
*) xmalloc (sizeof (struct symtab_and_line
));
4448 init_sal (break_callback_sal
);
4449 break_callback_sal
->symtab
= NULL
;
4450 break_callback_sal
->pc
= eh_break_addr
;
4451 break_callback_sal
->line
= 0;
4452 break_callback_sal
->end
= eh_break_addr
;
4454 return break_callback_sal
;
4457 /* Record some information about the current exception event */
4458 static struct exception_event_record current_ex_event
;
4459 /* Convenience struct */
4460 static struct symtab_and_line null_symtab_and_line
=
4463 /* Report current exception event. Returns a pointer to a record
4464 that describes the kind of the event, where it was thrown from,
4465 and where it will be caught. More information may be reported
4467 struct exception_event_record
*
4468 child_get_current_exception_event (void)
4470 CORE_ADDR event_kind
;
4471 CORE_ADDR throw_addr
;
4472 CORE_ADDR catch_addr
;
4473 struct frame_info
*fi
, *curr_frame
;
4476 curr_frame
= get_current_frame ();
4478 return (struct exception_event_record
*) NULL
;
4480 /* Go up one frame to __d_eh_notify_callback, because at the
4481 point when this code is executed, there's garbage in the
4482 arguments of __d_eh_break. */
4483 fi
= find_relative_frame (curr_frame
, &level
);
4485 return (struct exception_event_record
*) NULL
;
4489 /* Read in the arguments */
4490 /* __d_eh_notify_callback() is called with 3 arguments:
4491 1. event kind catch or throw
4492 2. the target address if known
4493 3. a flag -- not sure what this is. pai/1997-07-17 */
4494 event_kind
= read_register (ARG0_REGNUM
);
4495 catch_addr
= read_register (ARG1_REGNUM
);
4497 /* Now go down to a user frame */
4498 /* For a throw, __d_eh_break is called by
4499 __d_eh_notify_callback which is called by
4500 __notify_throw which is called
4502 For a catch, __d_eh_break is called by
4503 __d_eh_notify_callback which is called by
4504 <stackwalking stuff> which is called by
4505 __throw__<stuff> or __rethrow_<stuff> which is called
4507 /* FIXME: Don't use such magic numbers; search for the frames */
4508 level
= (event_kind
== EX_EVENT_THROW
) ? 3 : 4;
4509 fi
= find_relative_frame (curr_frame
, &level
);
4511 return (struct exception_event_record
*) NULL
;
4514 throw_addr
= fi
->pc
;
4516 /* Go back to original (top) frame */
4517 select_frame (curr_frame
);
4519 current_ex_event
.kind
= (enum exception_event_kind
) event_kind
;
4520 current_ex_event
.throw_sal
= find_pc_line (throw_addr
, 1);
4521 current_ex_event
.catch_sal
= find_pc_line (catch_addr
, 1);
4523 return ¤t_ex_event
;
4527 unwind_command (char *exp
, int from_tty
)
4530 struct unwind_table_entry
*u
;
4532 /* If we have an expression, evaluate it and use it as the address. */
4534 if (exp
!= 0 && *exp
!= 0)
4535 address
= parse_and_eval_address (exp
);
4539 u
= find_unwind_entry (address
);
4543 printf_unfiltered ("Can't find unwind table entry for %s\n", exp
);
4547 printf_unfiltered ("unwind_table_entry (0x%s):\n",
4548 paddr_nz (host_pointer_to_address (u
)));
4550 printf_unfiltered ("\tregion_start = ");
4551 print_address (u
->region_start
, gdb_stdout
);
4553 printf_unfiltered ("\n\tregion_end = ");
4554 print_address (u
->region_end
, gdb_stdout
);
4556 #define pif(FLD) if (u->FLD) printf_unfiltered (" "#FLD);
4558 printf_unfiltered ("\n\tflags =");
4559 pif (Cannot_unwind
);
4561 pif (Millicode_save_sr0
);
4564 pif (Variable_Frame
);
4565 pif (Separate_Package_Body
);
4566 pif (Frame_Extension_Millicode
);
4567 pif (Stack_Overflow_Check
);
4568 pif (Two_Instruction_SP_Increment
);
4572 pif (Save_MRP_in_frame
);
4573 pif (extn_ptr_defined
);
4574 pif (Cleanup_defined
);
4575 pif (MPE_XL_interrupt_marker
);
4576 pif (HP_UX_interrupt_marker
);
4579 putchar_unfiltered ('\n');
4581 #define pin(FLD) printf_unfiltered ("\t"#FLD" = 0x%x\n", u->FLD);
4583 pin (Region_description
);
4586 pin (Total_frame_size
);
4589 #ifdef PREPARE_TO_PROCEED
4591 /* If the user has switched threads, and there is a breakpoint
4592 at the old thread's pc location, then switch to that thread
4593 and return TRUE, else return FALSE and don't do a thread
4594 switch (or rather, don't seem to have done a thread switch).
4596 Ptrace-based gdb will always return FALSE to the thread-switch
4597 query, and thus also to PREPARE_TO_PROCEED.
4599 The important thing is whether there is a BPT instruction,
4600 not how many user breakpoints there are. So we have to worry
4601 about things like these:
4605 o User hits bp, no switch -- NO
4607 o User hits bp, switches threads -- YES
4609 o User hits bp, deletes bp, switches threads -- NO
4611 o User hits bp, deletes one of two or more bps
4612 at that PC, user switches threads -- YES
4614 o Plus, since we're buffering events, the user may have hit a
4615 breakpoint, deleted the breakpoint and then gotten another
4616 hit on that same breakpoint on another thread which
4617 actually hit before the delete. (FIXME in breakpoint.c
4618 so that "dead" breakpoints are ignored?) -- NO
4620 For these reasons, we have to violate information hiding and
4621 call "breakpoint_here_p". If core gdb thinks there is a bpt
4622 here, that's what counts, as core gdb is the one which is
4623 putting the BPT instruction in and taking it out.
4625 Note that this implementation is potentially redundant now that
4626 default_prepare_to_proceed() has been added.
4628 FIXME This may not support switching threads after Ctrl-C
4629 correctly. The default implementation does support this. */
4631 hppa_prepare_to_proceed (void)
4634 pid_t current_thread
;
4636 old_thread
= hppa_switched_threads (PIDGET (inferior_ptid
));
4637 if (old_thread
!= 0)
4639 /* Switched over from "old_thread". Try to do
4640 as little work as possible, 'cause mostly
4641 we're going to switch back. */
4643 CORE_ADDR old_pc
= read_pc ();
4645 /* Yuk, shouldn't use global to specify current
4646 thread. But that's how gdb does it. */
4647 current_thread
= PIDGET (inferior_ptid
);
4648 inferior_ptid
= pid_to_ptid (old_thread
);
4650 new_pc
= read_pc ();
4651 if (new_pc
!= old_pc
/* If at same pc, no need */
4652 && breakpoint_here_p (new_pc
))
4654 /* User hasn't deleted the BP.
4655 Return TRUE, finishing switch to "old_thread". */
4656 flush_cached_frames ();
4657 registers_changed ();
4659 printf ("---> PREPARE_TO_PROCEED (was %d, now %d)!\n",
4660 current_thread
, PIDGET (inferior_ptid
));
4666 /* Otherwise switch back to the user-chosen thread. */
4667 inferior_ptid
= pid_to_ptid (current_thread
);
4668 new_pc
= read_pc (); /* Re-prime register cache */
4673 #endif /* PREPARE_TO_PROCEED */
4676 hppa_skip_permanent_breakpoint (void)
4678 /* To step over a breakpoint instruction on the PA takes some
4679 fiddling with the instruction address queue.
4681 When we stop at a breakpoint, the IA queue front (the instruction
4682 we're executing now) points at the breakpoint instruction, and
4683 the IA queue back (the next instruction to execute) points to
4684 whatever instruction we would execute after the breakpoint, if it
4685 were an ordinary instruction. This is the case even if the
4686 breakpoint is in the delay slot of a branch instruction.
4688 Clearly, to step past the breakpoint, we need to set the queue
4689 front to the back. But what do we put in the back? What
4690 instruction comes after that one? Because of the branch delay
4691 slot, the next insn is always at the back + 4. */
4692 write_register (PCOQ_HEAD_REGNUM
, read_register (PCOQ_TAIL_REGNUM
));
4693 write_register (PCSQ_HEAD_REGNUM
, read_register (PCSQ_TAIL_REGNUM
));
4695 write_register (PCOQ_TAIL_REGNUM
, read_register (PCOQ_TAIL_REGNUM
) + 4);
4696 /* We can leave the tail's space the same, since there's no jump. */
4699 /* Copy the function value from VALBUF into the proper location
4700 for a function return.
4702 Called only in the context of the "return" command. */
4705 hppa_store_return_value (struct type
*type
, char *valbuf
)
4707 /* For software floating point, the return value goes into the
4708 integer registers. But we do not have any flag to key this on,
4709 so we always store the value into the integer registers.
4711 If its a float value, then we also store it into the floating
4713 write_register_bytes (REGISTER_BYTE (28)
4714 + (TYPE_LENGTH (type
) > 4
4715 ? (8 - TYPE_LENGTH (type
))
4716 : (4 - TYPE_LENGTH (type
))),
4718 TYPE_LENGTH (type
));
4719 if (! SOFT_FLOAT
&& TYPE_CODE (type
) == TYPE_CODE_FLT
)
4720 write_register_bytes (REGISTER_BYTE (FP4_REGNUM
),
4722 TYPE_LENGTH (type
));
4725 /* Copy the function's return value into VALBUF.
4727 This function is called only in the context of "target function calls",
4728 ie. when the debugger forces a function to be called in the child, and
4729 when the debugger forces a fucntion to return prematurely via the
4730 "return" command. */
4733 hppa_extract_return_value (struct type
*type
, char *regbuf
, char *valbuf
)
4735 if (! SOFT_FLOAT
&& TYPE_CODE (type
) == TYPE_CODE_FLT
)
4737 (char *)regbuf
+ REGISTER_BYTE (FP4_REGNUM
),
4738 TYPE_LENGTH (type
));
4742 + REGISTER_BYTE (28)
4743 + (TYPE_LENGTH (type
) > 4
4744 ? (8 - TYPE_LENGTH (type
))
4745 : (4 - TYPE_LENGTH (type
)))),
4746 TYPE_LENGTH (type
));
4750 hppa_reg_struct_has_addr (int gcc_p
, struct type
*type
)
4752 /* On the PA, any pass-by-value structure > 8 bytes is actually passed
4753 via a pointer regardless of its type or the compiler used. */
4754 return (TYPE_LENGTH (type
) > 8);
4758 hppa_inner_than (CORE_ADDR lhs
, CORE_ADDR rhs
)
4760 /* Stack grows upward */
4765 hppa_stack_align (CORE_ADDR sp
)
4767 /* elz: adjust the quantity to the next highest value which is
4768 64-bit aligned. This is used in valops.c, when the sp is adjusted.
4769 On hppa the sp must always be kept 64-bit aligned */
4770 return ((sp
% 8) ? (sp
+ 7) & -8 : sp
);
4774 hppa_pc_requires_run_before_use (CORE_ADDR pc
)
4776 /* Sometimes we may pluck out a minimal symbol that has a negative address.
4778 An example of this occurs when an a.out is linked against a foo.sl.
4779 The foo.sl defines a global bar(), and the a.out declares a signature
4780 for bar(). However, the a.out doesn't directly call bar(), but passes
4781 its address in another call.
4783 If you have this scenario and attempt to "break bar" before running,
4784 gdb will find a minimal symbol for bar() in the a.out. But that
4785 symbol's address will be negative. What this appears to denote is
4786 an index backwards from the base of the procedure linkage table (PLT)
4787 into the data linkage table (DLT), the end of which is contiguous
4788 with the start of the PLT. This is clearly not a valid address for
4789 us to set a breakpoint on.
4791 Note that one must be careful in how one checks for a negative address.
4792 0xc0000000 is a legitimate address of something in a shared text
4793 segment, for example. Since I don't know what the possible range
4794 is of these "really, truly negative" addresses that come from the
4795 minimal symbols, I'm resorting to the gross hack of checking the
4796 top byte of the address for all 1's. Sigh. */
4798 return (!target_has_stack
&& (pc
& 0xFF000000));
4802 hppa_instruction_nullified (void)
4804 /* brobecker 2002/11/07: Couldn't we use a ULONGEST here? It would
4805 avoid the type cast. I'm leaving it as is for now as I'm doing
4806 semi-mechanical multiarching-related changes. */
4807 const int ipsw
= (int) read_register (IPSW_REGNUM
);
4808 const int flags
= (int) read_register (FLAGS_REGNUM
);
4810 return ((ipsw
& 0x00200000) && !(flags
& 0x2));
4813 /* Index within the register vector of the first byte of the space i
4814 used for register REG_NR. */
4817 hppa_register_byte (int reg_nr
)
4822 /* Return the GDB type object for the "standard" data type of data
4826 hppa_register_virtual_type (int reg_nr
)
4828 if (reg_nr
< FP4_REGNUM
)
4829 return builtin_type_int
;
4831 return builtin_type_float
;
4834 /* Store the address of the place in which to copy the structure the
4835 subroutine will return. This is called from call_function. */
4838 hppa_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
4840 write_register (28, addr
);
4843 /* Return True if REGNUM is not a register available to the user
4844 through ptrace(). */
4847 hppa_cannot_store_register (int regnum
)
4850 || regnum
== PCSQ_HEAD_REGNUM
4851 || (regnum
>= PCSQ_TAIL_REGNUM
&& regnum
< IPSW_REGNUM
)
4852 || (regnum
> IPSW_REGNUM
&& regnum
< FP4_REGNUM
));
4857 hppa_frame_args_address (struct frame_info
*fi
)
4863 hppa_frame_locals_address (struct frame_info
*fi
)
4869 hppa_smash_text_address (CORE_ADDR addr
)
4871 /* The low two bits of the PC on the PA contain the privilege level.
4872 Some genius implementing a (non-GCC) compiler apparently decided
4873 this means that "addresses" in a text section therefore include a
4874 privilege level, and thus symbol tables should contain these bits.
4875 This seems like a bonehead thing to do--anyway, it seems to work
4876 for our purposes to just ignore those bits. */
4878 return (addr
&= ~0x3);
4882 hppa_coerce_float_to_double (struct type
*formal
, struct type
*actual
)
4884 /* FIXME: For the pa, it appears that the debug info marks the
4885 parameters as floats regardless of whether the function is
4886 prototyped, but the actual values are passed as doubles for the
4887 non-prototyped case and floats for the prototyped case. Thus we
4888 choose to make the non-prototyped case work for C and break the
4889 prototyped case, since the non-prototyped case is probably much
4891 return (current_language
-> la_language
== language_c
);
4894 static struct gdbarch
*
4895 hppa_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
4897 struct gdbarch
*gdbarch
;
4899 /* find a candidate among the list of pre-declared architectures. */
4900 arches
= gdbarch_list_lookup_by_info (arches
, &info
);
4902 return (arches
->gdbarch
);
4904 /* If none found, then allocate and initialize one. */
4905 gdbarch
= gdbarch_alloc (&info
, NULL
);
4911 hppa_dump_tdep (struct gdbarch
*current_gdbarch
, struct ui_file
*file
)
4913 /* Nothing to print for the moment. */
4917 _initialize_hppa_tdep (void)
4919 struct cmd_list_element
*c
;
4920 void break_at_finish_command (char *arg
, int from_tty
);
4921 void tbreak_at_finish_command (char *arg
, int from_tty
);
4922 void break_at_finish_at_depth_command (char *arg
, int from_tty
);
4924 gdbarch_register (bfd_arch_hppa
, hppa_gdbarch_init
, hppa_dump_tdep
);
4925 tm_print_insn
= print_insn_hppa
;
4927 add_cmd ("unwind", class_maintenance
, unwind_command
,
4928 "Print unwind table entry at given address.",
4929 &maintenanceprintlist
);
4931 deprecate_cmd (add_com ("xbreak", class_breakpoint
,
4932 break_at_finish_command
,
4933 concat ("Set breakpoint at procedure exit. \n\
4934 Argument may be function name, or \"*\" and an address.\n\
4935 If function is specified, break at end of code for that function.\n\
4936 If an address is specified, break at the end of the function that contains \n\
4937 that exact address.\n",
4938 "With no arg, uses current execution address of selected stack frame.\n\
4939 This is useful for breaking on return to a stack frame.\n\
4941 Multiple breakpoints at one place are permitted, and useful if conditional.\n\
4943 Do \"help breakpoints\" for info on other commands dealing with breakpoints.", NULL
)), NULL
);
4944 deprecate_cmd (add_com_alias ("xb", "xbreak", class_breakpoint
, 1), NULL
);
4945 deprecate_cmd (add_com_alias ("xbr", "xbreak", class_breakpoint
, 1), NULL
);
4946 deprecate_cmd (add_com_alias ("xbre", "xbreak", class_breakpoint
, 1), NULL
);
4947 deprecate_cmd (add_com_alias ("xbrea", "xbreak", class_breakpoint
, 1), NULL
);
4949 deprecate_cmd (c
= add_com ("txbreak", class_breakpoint
,
4950 tbreak_at_finish_command
,
4951 "Set temporary breakpoint at procedure exit. Either there should\n\
4952 be no argument or the argument must be a depth.\n"), NULL
);
4953 set_cmd_completer (c
, location_completer
);
4956 deprecate_cmd (add_com ("bx", class_breakpoint
,
4957 break_at_finish_at_depth_command
,
4958 "Set breakpoint at procedure exit. Either there should\n\
4959 be no argument or the argument must be a depth.\n"), NULL
);