1 /* Target-dependent code for the HP PA architecture, for GDB.
3 Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
4 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software
7 Contributed by the Center for Software Science at the
8 University of Utah (pa-gdb-bugs@cs.utah.edu).
10 This file is part of GDB.
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 59 Temple Place - Suite 330,
25 Boston, MA 02111-1307, USA. */
33 #include "completer.h"
36 #include "gdb_assert.h"
37 #include "infttrace.h"
38 #include "arch-utils.h"
39 /* For argument passing to the inferior */
43 #include "trad-frame.h"
44 #include "frame-unwind.h"
45 #include "frame-base.h"
48 #include <sys/types.h>
52 #include <sys/param.h>
55 #include <sys/ptrace.h>
56 #include <machine/save_state.h>
58 #ifdef COFF_ENCAPSULATE
59 #include "a.out.encap.h"
63 /*#include <sys/user.h> After a.out.h */
73 #include "hppa-tdep.h"
75 /* Some local constants. */
76 static const int hppa32_num_regs
= 128;
77 static const int hppa64_num_regs
= 96;
79 /* Get at various relevent fields of an instruction word. */
82 #define MASK_14 0x3fff
83 #define MASK_21 0x1fffff
85 /* Define offsets into the call dummy for the _sr4export address.
86 See comments related to CALL_DUMMY for more info. */
87 #define SR4EXPORT_LDIL_OFFSET (INSTRUCTION_SIZE * 12)
88 #define SR4EXPORT_LDO_OFFSET (INSTRUCTION_SIZE * 13)
90 /* To support detection of the pseudo-initial frame
92 #define THREAD_INITIAL_FRAME_SYMBOL "__pthread_exit"
93 #define THREAD_INITIAL_FRAME_SYM_LEN sizeof(THREAD_INITIAL_FRAME_SYMBOL)
95 /* Sizes (in bytes) of the native unwind entries. */
96 #define UNWIND_ENTRY_SIZE 16
97 #define STUB_UNWIND_ENTRY_SIZE 8
99 static int get_field (unsigned word
, int from
, int to
);
101 static int extract_5_load (unsigned int);
103 static unsigned extract_5R_store (unsigned int);
105 static unsigned extract_5r_store (unsigned int);
107 struct unwind_table_entry
*find_unwind_entry (CORE_ADDR
);
109 static int extract_17 (unsigned int);
111 static int extract_21 (unsigned);
113 static int extract_14 (unsigned);
115 static void unwind_command (char *, int);
117 static int low_sign_extend (unsigned int, unsigned int);
119 static int sign_extend (unsigned int, unsigned int);
121 static int hppa_alignof (struct type
*);
123 static int prologue_inst_adjust_sp (unsigned long);
125 static int is_branch (unsigned long);
127 static int inst_saves_gr (unsigned long);
129 static int inst_saves_fr (unsigned long);
131 static int compare_unwind_entries (const void *, const void *);
133 static void read_unwind_info (struct objfile
*);
135 static void internalize_unwinds (struct objfile
*,
136 struct unwind_table_entry
*,
137 asection
*, unsigned int,
138 unsigned int, CORE_ADDR
);
139 static void record_text_segment_lowaddr (bfd
*, asection
*, void *);
140 /* FIXME: brobecker 2002-11-07: We will likely be able to make the
141 following functions static, once we hppa is partially multiarched. */
142 int hppa_reg_struct_has_addr (int gcc_p
, struct type
*type
);
143 CORE_ADDR
hppa_skip_prologue (CORE_ADDR pc
);
144 CORE_ADDR
hppa_skip_trampoline_code (CORE_ADDR pc
);
145 int hppa_in_solib_call_trampoline (CORE_ADDR pc
, char *name
);
146 int hppa_in_solib_return_trampoline (CORE_ADDR pc
, char *name
);
147 int hppa_inner_than (CORE_ADDR lhs
, CORE_ADDR rhs
);
148 int hppa_pc_requires_run_before_use (CORE_ADDR pc
);
149 int hppa_instruction_nullified (void);
150 int hppa_cannot_store_register (int regnum
);
151 CORE_ADDR
hppa_smash_text_address (CORE_ADDR addr
);
152 CORE_ADDR
hppa_target_read_pc (ptid_t ptid
);
153 void hppa_target_write_pc (CORE_ADDR v
, ptid_t ptid
);
157 struct minimal_symbol
*msym
;
158 CORE_ADDR solib_handle
;
159 CORE_ADDR return_val
;
163 static int cover_find_stub_with_shl_get (void *);
165 static int is_pa_2
= 0; /* False */
167 /* This is declared in symtab.c; set to 1 in hp-symtab-read.c */
168 extern int hp_som_som_object_present
;
170 /* In breakpoint.c */
171 extern int exception_catchpoints_are_fragile
;
173 /* Handle 32/64-bit struct return conventions. */
175 static enum return_value_convention
176 hppa32_return_value (struct gdbarch
*gdbarch
,
177 struct type
*type
, struct regcache
*regcache
,
178 void *readbuf
, const void *writebuf
)
180 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
183 regcache_cooked_read_part (regcache
, FP4_REGNUM
, 0,
184 TYPE_LENGTH (type
), readbuf
);
185 if (writebuf
!= NULL
)
186 regcache_cooked_write_part (regcache
, FP4_REGNUM
, 0,
187 TYPE_LENGTH (type
), writebuf
);
188 return RETURN_VALUE_REGISTER_CONVENTION
;
190 if (TYPE_LENGTH (type
) <= 2 * 4)
192 /* The value always lives in the right hand end of the register
193 (or register pair)? */
196 int part
= TYPE_LENGTH (type
) % 4;
197 /* The left hand register contains only part of the value,
198 transfer that first so that the rest can be xfered as entire
203 regcache_cooked_read_part (regcache
, reg
, 4 - part
,
205 if (writebuf
!= NULL
)
206 regcache_cooked_write_part (regcache
, reg
, 4 - part
,
210 /* Now transfer the remaining register values. */
211 for (b
= part
; b
< TYPE_LENGTH (type
); b
+= 4)
214 regcache_cooked_read (regcache
, reg
, (char *) readbuf
+ b
);
215 if (writebuf
!= NULL
)
216 regcache_cooked_write (regcache
, reg
, (const char *) writebuf
+ b
);
219 return RETURN_VALUE_REGISTER_CONVENTION
;
222 return RETURN_VALUE_STRUCT_CONVENTION
;
225 static enum return_value_convention
226 hppa64_return_value (struct gdbarch
*gdbarch
,
227 struct type
*type
, struct regcache
*regcache
,
228 void *readbuf
, const void *writebuf
)
230 /* RM: Floats are returned in FR4R, doubles in FR4. Integral values
231 are in r28, padded on the left. Aggregates less that 65 bits are
232 in r28, right padded. Aggregates upto 128 bits are in r28 and
233 r29, right padded. */
234 if (TYPE_CODE (type
) == TYPE_CODE_FLT
235 && TYPE_LENGTH (type
) <= 8)
237 /* Floats are right aligned? */
238 int offset
= register_size (gdbarch
, FP4_REGNUM
) - TYPE_LENGTH (type
);
240 regcache_cooked_read_part (regcache
, FP4_REGNUM
, offset
,
241 TYPE_LENGTH (type
), readbuf
);
242 if (writebuf
!= NULL
)
243 regcache_cooked_write_part (regcache
, FP4_REGNUM
, offset
,
244 TYPE_LENGTH (type
), writebuf
);
245 return RETURN_VALUE_REGISTER_CONVENTION
;
247 else if (TYPE_LENGTH (type
) <= 8 && is_integral_type (type
))
249 /* Integrals are right aligned. */
250 int offset
= register_size (gdbarch
, FP4_REGNUM
) - TYPE_LENGTH (type
);
252 regcache_cooked_read_part (regcache
, 28, offset
,
253 TYPE_LENGTH (type
), readbuf
);
254 if (writebuf
!= NULL
)
255 regcache_cooked_write_part (regcache
, 28, offset
,
256 TYPE_LENGTH (type
), writebuf
);
257 return RETURN_VALUE_REGISTER_CONVENTION
;
259 else if (TYPE_LENGTH (type
) <= 2 * 8)
261 /* Composite values are left aligned. */
263 for (b
= 0; b
< TYPE_LENGTH (type
); b
+= 8)
265 int part
= min (8, TYPE_LENGTH (type
) - b
);
267 regcache_cooked_read_part (regcache
, 28 + b
/ 8, 0, part
,
268 (char *) readbuf
+ b
);
269 if (writebuf
!= NULL
)
270 regcache_cooked_write_part (regcache
, 28 + b
/ 8, 0, part
,
271 (const char *) writebuf
+ b
);
273 return RETURN_VALUE_REGISTER_CONVENTION
;
276 return RETURN_VALUE_STRUCT_CONVENTION
;
279 /* Routines to extract various sized constants out of hppa
282 /* This assumes that no garbage lies outside of the lower bits of
286 sign_extend (unsigned val
, unsigned bits
)
288 return (int) (val
>> (bits
- 1) ? (-1 << bits
) | val
: val
);
291 /* For many immediate values the sign bit is the low bit! */
294 low_sign_extend (unsigned val
, unsigned bits
)
296 return (int) ((val
& 0x1 ? (-1 << (bits
- 1)) : 0) | val
>> 1);
299 /* Extract the bits at positions between FROM and TO, using HP's numbering
303 get_field (unsigned word
, int from
, int to
)
305 return ((word
) >> (31 - (to
)) & ((1 << ((to
) - (from
) + 1)) - 1));
308 /* extract the immediate field from a ld{bhw}s instruction */
311 extract_5_load (unsigned word
)
313 return low_sign_extend (word
>> 16 & MASK_5
, 5);
316 /* extract the immediate field from a break instruction */
319 extract_5r_store (unsigned word
)
321 return (word
& MASK_5
);
324 /* extract the immediate field from a {sr}sm instruction */
327 extract_5R_store (unsigned word
)
329 return (word
>> 16 & MASK_5
);
332 /* extract a 14 bit immediate field */
335 extract_14 (unsigned word
)
337 return low_sign_extend (word
& MASK_14
, 14);
340 /* extract a 21 bit constant */
343 extract_21 (unsigned word
)
349 val
= get_field (word
, 20, 20);
351 val
|= get_field (word
, 9, 19);
353 val
|= get_field (word
, 5, 6);
355 val
|= get_field (word
, 0, 4);
357 val
|= get_field (word
, 7, 8);
358 return sign_extend (val
, 21) << 11;
361 /* extract a 17 bit constant from branch instructions, returning the
362 19 bit signed value. */
365 extract_17 (unsigned word
)
367 return sign_extend (get_field (word
, 19, 28) |
368 get_field (word
, 29, 29) << 10 |
369 get_field (word
, 11, 15) << 11 |
370 (word
& 0x1) << 16, 17) << 2;
374 /* Compare the start address for two unwind entries returning 1 if
375 the first address is larger than the second, -1 if the second is
376 larger than the first, and zero if they are equal. */
379 compare_unwind_entries (const void *arg1
, const void *arg2
)
381 const struct unwind_table_entry
*a
= arg1
;
382 const struct unwind_table_entry
*b
= arg2
;
384 if (a
->region_start
> b
->region_start
)
386 else if (a
->region_start
< b
->region_start
)
392 static CORE_ADDR low_text_segment_address
;
395 record_text_segment_lowaddr (bfd
*abfd
, asection
*section
, void *ignored
)
397 if (((section
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
))
398 == (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
))
399 && section
->vma
< low_text_segment_address
)
400 low_text_segment_address
= section
->vma
;
404 internalize_unwinds (struct objfile
*objfile
, struct unwind_table_entry
*table
,
405 asection
*section
, unsigned int entries
, unsigned int size
,
406 CORE_ADDR text_offset
)
408 /* We will read the unwind entries into temporary memory, then
409 fill in the actual unwind table. */
414 char *buf
= alloca (size
);
416 low_text_segment_address
= -1;
418 /* If addresses are 64 bits wide, then unwinds are supposed to
419 be segment relative offsets instead of absolute addresses.
421 Note that when loading a shared library (text_offset != 0) the
422 unwinds are already relative to the text_offset that will be
424 if (TARGET_PTR_BIT
== 64 && text_offset
== 0)
426 bfd_map_over_sections (objfile
->obfd
,
427 record_text_segment_lowaddr
, NULL
);
429 /* ?!? Mask off some low bits. Should this instead subtract
430 out the lowest section's filepos or something like that?
431 This looks very hokey to me. */
432 low_text_segment_address
&= ~0xfff;
433 text_offset
+= low_text_segment_address
;
436 bfd_get_section_contents (objfile
->obfd
, section
, buf
, 0, size
);
438 /* Now internalize the information being careful to handle host/target
440 for (i
= 0; i
< entries
; i
++)
442 table
[i
].region_start
= bfd_get_32 (objfile
->obfd
,
444 table
[i
].region_start
+= text_offset
;
446 table
[i
].region_end
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) buf
);
447 table
[i
].region_end
+= text_offset
;
449 tmp
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) buf
);
451 table
[i
].Cannot_unwind
= (tmp
>> 31) & 0x1;
452 table
[i
].Millicode
= (tmp
>> 30) & 0x1;
453 table
[i
].Millicode_save_sr0
= (tmp
>> 29) & 0x1;
454 table
[i
].Region_description
= (tmp
>> 27) & 0x3;
455 table
[i
].reserved1
= (tmp
>> 26) & 0x1;
456 table
[i
].Entry_SR
= (tmp
>> 25) & 0x1;
457 table
[i
].Entry_FR
= (tmp
>> 21) & 0xf;
458 table
[i
].Entry_GR
= (tmp
>> 16) & 0x1f;
459 table
[i
].Args_stored
= (tmp
>> 15) & 0x1;
460 table
[i
].Variable_Frame
= (tmp
>> 14) & 0x1;
461 table
[i
].Separate_Package_Body
= (tmp
>> 13) & 0x1;
462 table
[i
].Frame_Extension_Millicode
= (tmp
>> 12) & 0x1;
463 table
[i
].Stack_Overflow_Check
= (tmp
>> 11) & 0x1;
464 table
[i
].Two_Instruction_SP_Increment
= (tmp
>> 10) & 0x1;
465 table
[i
].Ada_Region
= (tmp
>> 9) & 0x1;
466 table
[i
].cxx_info
= (tmp
>> 8) & 0x1;
467 table
[i
].cxx_try_catch
= (tmp
>> 7) & 0x1;
468 table
[i
].sched_entry_seq
= (tmp
>> 6) & 0x1;
469 table
[i
].reserved2
= (tmp
>> 5) & 0x1;
470 table
[i
].Save_SP
= (tmp
>> 4) & 0x1;
471 table
[i
].Save_RP
= (tmp
>> 3) & 0x1;
472 table
[i
].Save_MRP_in_frame
= (tmp
>> 2) & 0x1;
473 table
[i
].extn_ptr_defined
= (tmp
>> 1) & 0x1;
474 table
[i
].Cleanup_defined
= tmp
& 0x1;
475 tmp
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) buf
);
477 table
[i
].MPE_XL_interrupt_marker
= (tmp
>> 31) & 0x1;
478 table
[i
].HP_UX_interrupt_marker
= (tmp
>> 30) & 0x1;
479 table
[i
].Large_frame
= (tmp
>> 29) & 0x1;
480 table
[i
].Pseudo_SP_Set
= (tmp
>> 28) & 0x1;
481 table
[i
].reserved4
= (tmp
>> 27) & 0x1;
482 table
[i
].Total_frame_size
= tmp
& 0x7ffffff;
484 /* Stub unwinds are handled elsewhere. */
485 table
[i
].stub_unwind
.stub_type
= 0;
486 table
[i
].stub_unwind
.padding
= 0;
491 /* Read in the backtrace information stored in the `$UNWIND_START$' section of
492 the object file. This info is used mainly by find_unwind_entry() to find
493 out the stack frame size and frame pointer used by procedures. We put
494 everything on the psymbol obstack in the objfile so that it automatically
495 gets freed when the objfile is destroyed. */
498 read_unwind_info (struct objfile
*objfile
)
500 asection
*unwind_sec
, *stub_unwind_sec
;
501 unsigned unwind_size
, stub_unwind_size
, total_size
;
502 unsigned index
, unwind_entries
;
503 unsigned stub_entries
, total_entries
;
504 CORE_ADDR text_offset
;
505 struct obj_unwind_info
*ui
;
506 obj_private_data_t
*obj_private
;
508 text_offset
= ANOFFSET (objfile
->section_offsets
, 0);
509 ui
= (struct obj_unwind_info
*) obstack_alloc (&objfile
->objfile_obstack
,
510 sizeof (struct obj_unwind_info
));
516 /* For reasons unknown the HP PA64 tools generate multiple unwinder
517 sections in a single executable. So we just iterate over every
518 section in the BFD looking for unwinder sections intead of trying
519 to do a lookup with bfd_get_section_by_name.
521 First determine the total size of the unwind tables so that we
522 can allocate memory in a nice big hunk. */
524 for (unwind_sec
= objfile
->obfd
->sections
;
526 unwind_sec
= unwind_sec
->next
)
528 if (strcmp (unwind_sec
->name
, "$UNWIND_START$") == 0
529 || strcmp (unwind_sec
->name
, ".PARISC.unwind") == 0)
531 unwind_size
= bfd_section_size (objfile
->obfd
, unwind_sec
);
532 unwind_entries
= unwind_size
/ UNWIND_ENTRY_SIZE
;
534 total_entries
+= unwind_entries
;
538 /* Now compute the size of the stub unwinds. Note the ELF tools do not
539 use stub unwinds at the curren time. */
540 stub_unwind_sec
= bfd_get_section_by_name (objfile
->obfd
, "$UNWIND_END$");
544 stub_unwind_size
= bfd_section_size (objfile
->obfd
, stub_unwind_sec
);
545 stub_entries
= stub_unwind_size
/ STUB_UNWIND_ENTRY_SIZE
;
549 stub_unwind_size
= 0;
553 /* Compute total number of unwind entries and their total size. */
554 total_entries
+= stub_entries
;
555 total_size
= total_entries
* sizeof (struct unwind_table_entry
);
557 /* Allocate memory for the unwind table. */
558 ui
->table
= (struct unwind_table_entry
*)
559 obstack_alloc (&objfile
->objfile_obstack
, total_size
);
560 ui
->last
= total_entries
- 1;
562 /* Now read in each unwind section and internalize the standard unwind
565 for (unwind_sec
= objfile
->obfd
->sections
;
567 unwind_sec
= unwind_sec
->next
)
569 if (strcmp (unwind_sec
->name
, "$UNWIND_START$") == 0
570 || strcmp (unwind_sec
->name
, ".PARISC.unwind") == 0)
572 unwind_size
= bfd_section_size (objfile
->obfd
, unwind_sec
);
573 unwind_entries
= unwind_size
/ UNWIND_ENTRY_SIZE
;
575 internalize_unwinds (objfile
, &ui
->table
[index
], unwind_sec
,
576 unwind_entries
, unwind_size
, text_offset
);
577 index
+= unwind_entries
;
581 /* Now read in and internalize the stub unwind entries. */
582 if (stub_unwind_size
> 0)
585 char *buf
= alloca (stub_unwind_size
);
587 /* Read in the stub unwind entries. */
588 bfd_get_section_contents (objfile
->obfd
, stub_unwind_sec
, buf
,
589 0, stub_unwind_size
);
591 /* Now convert them into regular unwind entries. */
592 for (i
= 0; i
< stub_entries
; i
++, index
++)
594 /* Clear out the next unwind entry. */
595 memset (&ui
->table
[index
], 0, sizeof (struct unwind_table_entry
));
597 /* Convert offset & size into region_start and region_end.
598 Stuff away the stub type into "reserved" fields. */
599 ui
->table
[index
].region_start
= bfd_get_32 (objfile
->obfd
,
601 ui
->table
[index
].region_start
+= text_offset
;
603 ui
->table
[index
].stub_unwind
.stub_type
= bfd_get_8 (objfile
->obfd
,
606 ui
->table
[index
].region_end
607 = ui
->table
[index
].region_start
+ 4 *
608 (bfd_get_16 (objfile
->obfd
, (bfd_byte
*) buf
) - 1);
614 /* Unwind table needs to be kept sorted. */
615 qsort (ui
->table
, total_entries
, sizeof (struct unwind_table_entry
),
616 compare_unwind_entries
);
618 /* Keep a pointer to the unwind information. */
619 if (objfile
->obj_private
== NULL
)
621 obj_private
= (obj_private_data_t
*)
622 obstack_alloc (&objfile
->objfile_obstack
,
623 sizeof (obj_private_data_t
));
624 obj_private
->unwind_info
= NULL
;
625 obj_private
->so_info
= NULL
;
628 objfile
->obj_private
= obj_private
;
630 obj_private
= (obj_private_data_t
*) objfile
->obj_private
;
631 obj_private
->unwind_info
= ui
;
634 /* Lookup the unwind (stack backtrace) info for the given PC. We search all
635 of the objfiles seeking the unwind table entry for this PC. Each objfile
636 contains a sorted list of struct unwind_table_entry. Since we do a binary
637 search of the unwind tables, we depend upon them to be sorted. */
639 struct unwind_table_entry
*
640 find_unwind_entry (CORE_ADDR pc
)
642 int first
, middle
, last
;
643 struct objfile
*objfile
;
645 /* A function at address 0? Not in HP-UX! */
646 if (pc
== (CORE_ADDR
) 0)
649 ALL_OBJFILES (objfile
)
651 struct obj_unwind_info
*ui
;
653 if (objfile
->obj_private
)
654 ui
= ((obj_private_data_t
*) (objfile
->obj_private
))->unwind_info
;
658 read_unwind_info (objfile
);
659 if (objfile
->obj_private
== NULL
)
660 error ("Internal error reading unwind information.");
661 ui
= ((obj_private_data_t
*) (objfile
->obj_private
))->unwind_info
;
664 /* First, check the cache */
667 && pc
>= ui
->cache
->region_start
668 && pc
<= ui
->cache
->region_end
)
671 /* Not in the cache, do a binary search */
676 while (first
<= last
)
678 middle
= (first
+ last
) / 2;
679 if (pc
>= ui
->table
[middle
].region_start
680 && pc
<= ui
->table
[middle
].region_end
)
682 ui
->cache
= &ui
->table
[middle
];
683 return &ui
->table
[middle
];
686 if (pc
< ui
->table
[middle
].region_start
)
691 } /* ALL_OBJFILES() */
695 const unsigned char *
696 hppa_breakpoint_from_pc (CORE_ADDR
*pc
, int *len
)
698 static const unsigned char breakpoint
[] = {0x00, 0x01, 0x00, 0x04};
699 (*len
) = sizeof (breakpoint
);
703 /* Return the name of a register. */
706 hppa32_register_name (int i
)
708 static char *names
[] = {
709 "flags", "r1", "rp", "r3",
710 "r4", "r5", "r6", "r7",
711 "r8", "r9", "r10", "r11",
712 "r12", "r13", "r14", "r15",
713 "r16", "r17", "r18", "r19",
714 "r20", "r21", "r22", "r23",
715 "r24", "r25", "r26", "dp",
716 "ret0", "ret1", "sp", "r31",
717 "sar", "pcoqh", "pcsqh", "pcoqt",
718 "pcsqt", "eiem", "iir", "isr",
719 "ior", "ipsw", "goto", "sr4",
720 "sr0", "sr1", "sr2", "sr3",
721 "sr5", "sr6", "sr7", "cr0",
722 "cr8", "cr9", "ccr", "cr12",
723 "cr13", "cr24", "cr25", "cr26",
724 "mpsfu_high","mpsfu_low","mpsfu_ovflo","pad",
725 "fpsr", "fpe1", "fpe2", "fpe3",
726 "fpe4", "fpe5", "fpe6", "fpe7",
727 "fr4", "fr4R", "fr5", "fr5R",
728 "fr6", "fr6R", "fr7", "fr7R",
729 "fr8", "fr8R", "fr9", "fr9R",
730 "fr10", "fr10R", "fr11", "fr11R",
731 "fr12", "fr12R", "fr13", "fr13R",
732 "fr14", "fr14R", "fr15", "fr15R",
733 "fr16", "fr16R", "fr17", "fr17R",
734 "fr18", "fr18R", "fr19", "fr19R",
735 "fr20", "fr20R", "fr21", "fr21R",
736 "fr22", "fr22R", "fr23", "fr23R",
737 "fr24", "fr24R", "fr25", "fr25R",
738 "fr26", "fr26R", "fr27", "fr27R",
739 "fr28", "fr28R", "fr29", "fr29R",
740 "fr30", "fr30R", "fr31", "fr31R"
742 if (i
< 0 || i
>= (sizeof (names
) / sizeof (*names
)))
749 hppa64_register_name (int i
)
751 static char *names
[] = {
752 "flags", "r1", "rp", "r3",
753 "r4", "r5", "r6", "r7",
754 "r8", "r9", "r10", "r11",
755 "r12", "r13", "r14", "r15",
756 "r16", "r17", "r18", "r19",
757 "r20", "r21", "r22", "r23",
758 "r24", "r25", "r26", "dp",
759 "ret0", "ret1", "sp", "r31",
760 "sar", "pcoqh", "pcsqh", "pcoqt",
761 "pcsqt", "eiem", "iir", "isr",
762 "ior", "ipsw", "goto", "sr4",
763 "sr0", "sr1", "sr2", "sr3",
764 "sr5", "sr6", "sr7", "cr0",
765 "cr8", "cr9", "ccr", "cr12",
766 "cr13", "cr24", "cr25", "cr26",
767 "mpsfu_high","mpsfu_low","mpsfu_ovflo","pad",
768 "fpsr", "fpe1", "fpe2", "fpe3",
769 "fr4", "fr5", "fr6", "fr7",
770 "fr8", "fr9", "fr10", "fr11",
771 "fr12", "fr13", "fr14", "fr15",
772 "fr16", "fr17", "fr18", "fr19",
773 "fr20", "fr21", "fr22", "fr23",
774 "fr24", "fr25", "fr26", "fr27",
775 "fr28", "fr29", "fr30", "fr31"
777 if (i
< 0 || i
>= (sizeof (names
) / sizeof (*names
)))
785 /* Return the adjustment necessary to make for addresses on the stack
786 as presented by hpread.c.
788 This is necessary because of the stack direction on the PA and the
789 bizarre way in which someone (?) decided they wanted to handle
790 frame pointerless code in GDB. */
792 hpread_adjust_stack_address (CORE_ADDR func_addr
)
794 struct unwind_table_entry
*u
;
796 u
= find_unwind_entry (func_addr
);
800 return u
->Total_frame_size
<< 3;
803 /* This function pushes a stack frame with arguments as part of the
804 inferior function calling mechanism.
806 This is the version of the function for the 32-bit PA machines, in
807 which later arguments appear at lower addresses. (The stack always
808 grows towards higher addresses.)
810 We simply allocate the appropriate amount of stack space and put
811 arguments into their proper slots. */
814 hppa32_push_dummy_call (struct gdbarch
*gdbarch
, CORE_ADDR func_addr
,
815 struct regcache
*regcache
, CORE_ADDR bp_addr
,
816 int nargs
, struct value
**args
, CORE_ADDR sp
,
817 int struct_return
, CORE_ADDR struct_addr
)
819 /* NOTE: cagney/2004-02-27: This is a guess - its implemented by
820 reverse engineering testsuite failures. */
822 /* Stack base address at which any pass-by-reference parameters are
824 CORE_ADDR struct_end
= 0;
825 /* Stack base address at which the first parameter is stored. */
826 CORE_ADDR param_end
= 0;
828 /* The inner most end of the stack after all the parameters have
830 CORE_ADDR new_sp
= 0;
832 /* Two passes. First pass computes the location of everything,
833 second pass writes the bytes out. */
835 for (write_pass
= 0; write_pass
< 2; write_pass
++)
837 CORE_ADDR struct_ptr
= 0;
838 CORE_ADDR param_ptr
= 0;
839 int reg
= 27; /* NOTE: Registers go down. */
841 for (i
= 0; i
< nargs
; i
++)
843 struct value
*arg
= args
[i
];
844 struct type
*type
= check_typedef (VALUE_TYPE (arg
));
845 /* The corresponding parameter that is pushed onto the
846 stack, and [possibly] passed in a register. */
849 memset (param_val
, 0, sizeof param_val
);
850 if (TYPE_LENGTH (type
) > 8)
852 /* Large parameter, pass by reference. Store the value
853 in "struct" area and then pass its address. */
855 struct_ptr
+= align_up (TYPE_LENGTH (type
), 8);
857 write_memory (struct_end
- struct_ptr
, VALUE_CONTENTS (arg
),
859 store_unsigned_integer (param_val
, 4, struct_end
- struct_ptr
);
861 else if (TYPE_CODE (type
) == TYPE_CODE_INT
862 || TYPE_CODE (type
) == TYPE_CODE_ENUM
)
864 /* Integer value store, right aligned. "unpack_long"
865 takes care of any sign-extension problems. */
866 param_len
= align_up (TYPE_LENGTH (type
), 4);
867 store_unsigned_integer (param_val
, param_len
,
869 VALUE_CONTENTS (arg
)));
873 /* Small struct value, store right aligned? */
874 param_len
= align_up (TYPE_LENGTH (type
), 4);
875 memcpy (param_val
+ param_len
- TYPE_LENGTH (type
),
876 VALUE_CONTENTS (arg
), TYPE_LENGTH (type
));
878 param_ptr
+= param_len
;
879 reg
-= param_len
/ 4;
882 write_memory (param_end
- param_ptr
, param_val
, param_len
);
885 regcache_cooked_write (regcache
, reg
, param_val
);
887 regcache_cooked_write (regcache
, reg
+ 1, param_val
+ 4);
892 /* Update the various stack pointers. */
895 struct_end
= sp
+ struct_ptr
;
896 /* PARAM_PTR already accounts for all the arguments passed
897 by the user. However, the ABI mandates minimum stack
898 space allocations for outgoing arguments. The ABI also
899 mandates minimum stack alignments which we must
901 param_end
= struct_end
+ max (align_up (param_ptr
, 8), 16);
905 /* If a structure has to be returned, set up register 28 to hold its
908 write_register (28, struct_addr
);
910 /* Set the return address. */
911 regcache_cooked_write_unsigned (regcache
, RP_REGNUM
, bp_addr
);
913 /* Update the Stack Pointer. */
914 regcache_cooked_write_unsigned (regcache
, SP_REGNUM
, param_end
+ 32);
916 /* The stack will have 32 bytes of additional space for a frame marker. */
917 return param_end
+ 32;
920 /* This function pushes a stack frame with arguments as part of the
921 inferior function calling mechanism.
923 This is the version for the PA64, in which later arguments appear
924 at higher addresses. (The stack always grows towards higher
927 We simply allocate the appropriate amount of stack space and put
928 arguments into their proper slots.
930 This ABI also requires that the caller provide an argument pointer
931 to the callee, so we do that too. */
934 hppa64_push_dummy_call (struct gdbarch
*gdbarch
, CORE_ADDR func_addr
,
935 struct regcache
*regcache
, CORE_ADDR bp_addr
,
936 int nargs
, struct value
**args
, CORE_ADDR sp
,
937 int struct_return
, CORE_ADDR struct_addr
)
939 /* NOTE: cagney/2004-02-27: This is a guess - its implemented by
940 reverse engineering testsuite failures. */
942 /* Stack base address at which any pass-by-reference parameters are
944 CORE_ADDR struct_end
= 0;
945 /* Stack base address at which the first parameter is stored. */
946 CORE_ADDR param_end
= 0;
948 /* The inner most end of the stack after all the parameters have
950 CORE_ADDR new_sp
= 0;
952 /* Two passes. First pass computes the location of everything,
953 second pass writes the bytes out. */
955 for (write_pass
= 0; write_pass
< 2; write_pass
++)
957 CORE_ADDR struct_ptr
= 0;
958 CORE_ADDR param_ptr
= 0;
960 for (i
= 0; i
< nargs
; i
++)
962 struct value
*arg
= args
[i
];
963 struct type
*type
= check_typedef (VALUE_TYPE (arg
));
964 if ((TYPE_CODE (type
) == TYPE_CODE_INT
965 || TYPE_CODE (type
) == TYPE_CODE_ENUM
)
966 && TYPE_LENGTH (type
) <= 8)
968 /* Integer value store, right aligned. "unpack_long"
969 takes care of any sign-extension problems. */
973 ULONGEST val
= unpack_long (type
, VALUE_CONTENTS (arg
));
974 int reg
= 27 - param_ptr
/ 8;
975 write_memory_unsigned_integer (param_end
- param_ptr
,
978 regcache_cooked_write_unsigned (regcache
, reg
, val
);
983 /* Small struct value, store left aligned? */
985 if (TYPE_LENGTH (type
) > 8)
987 param_ptr
= align_up (param_ptr
, 16);
988 reg
= 26 - param_ptr
/ 8;
989 param_ptr
+= align_up (TYPE_LENGTH (type
), 16);
993 param_ptr
= align_up (param_ptr
, 8);
994 reg
= 26 - param_ptr
/ 8;
995 param_ptr
+= align_up (TYPE_LENGTH (type
), 8);
1000 write_memory (param_end
- param_ptr
, VALUE_CONTENTS (arg
),
1001 TYPE_LENGTH (type
));
1002 for (byte
= 0; byte
< TYPE_LENGTH (type
); byte
+= 8)
1006 int len
= min (8, TYPE_LENGTH (type
) - byte
);
1007 regcache_cooked_write_part (regcache
, reg
, 0, len
,
1008 VALUE_CONTENTS (arg
) + byte
);
1015 /* Update the various stack pointers. */
1018 struct_end
= sp
+ struct_ptr
;
1019 /* PARAM_PTR already accounts for all the arguments passed
1020 by the user. However, the ABI mandates minimum stack
1021 space allocations for outgoing arguments. The ABI also
1022 mandates minimum stack alignments which we must
1024 param_end
= struct_end
+ max (align_up (param_ptr
, 16), 64);
1028 /* If a structure has to be returned, set up register 28 to hold its
1031 write_register (28, struct_addr
);
1033 /* Set the return address. */
1034 regcache_cooked_write_unsigned (regcache
, RP_REGNUM
, bp_addr
);
1036 /* Update the Stack Pointer. */
1037 regcache_cooked_write_unsigned (regcache
, SP_REGNUM
, param_end
+ 64);
1039 /* The stack will have 32 bytes of additional space for a frame marker. */
1040 return param_end
+ 64;
1044 hppa32_frame_align (struct gdbarch
*gdbarch
, CORE_ADDR addr
)
1046 /* HP frames are 64-byte (or cache line) aligned (yes that's _byte_
1048 return align_up (addr
, 64);
1051 /* Force all frames to 16-byte alignment. Better safe than sorry. */
1054 hppa64_frame_align (struct gdbarch
*gdbarch
, CORE_ADDR addr
)
1056 /* Just always 16-byte align. */
1057 return align_up (addr
, 16);
1061 /* elz: Used to lookup a symbol in the shared libraries.
1062 This function calls shl_findsym, indirectly through a
1063 call to __d_shl_get. __d_shl_get is in end.c, which is always
1064 linked in by the hp compilers/linkers.
1065 The call to shl_findsym cannot be made directly because it needs
1066 to be active in target address space.
1067 inputs: - minimal symbol pointer for the function we want to look up
1068 - address in target space of the descriptor for the library
1069 where we want to look the symbol up.
1070 This address is retrieved using the
1071 som_solib_get_solib_by_pc function (somsolib.c).
1072 output: - real address in the library of the function.
1073 note: the handle can be null, in which case shl_findsym will look for
1074 the symbol in all the loaded shared libraries.
1075 files to look at if you need reference on this stuff:
1076 dld.c, dld_shl_findsym.c
1078 man entry for shl_findsym */
1081 find_stub_with_shl_get (struct minimal_symbol
*function
, CORE_ADDR handle
)
1083 struct symbol
*get_sym
, *symbol2
;
1084 struct minimal_symbol
*buff_minsym
, *msymbol
;
1086 struct value
**args
;
1087 struct value
*funcval
;
1090 int x
, namelen
, err_value
, tmp
= -1;
1091 CORE_ADDR endo_buff_addr
, value_return_addr
, errno_return_addr
;
1092 CORE_ADDR stub_addr
;
1095 args
= alloca (sizeof (struct value
*) * 8); /* 6 for the arguments and one null one??? */
1096 funcval
= find_function_in_inferior ("__d_shl_get");
1097 get_sym
= lookup_symbol ("__d_shl_get", NULL
, VAR_DOMAIN
, NULL
, NULL
);
1098 buff_minsym
= lookup_minimal_symbol ("__buffer", NULL
, NULL
);
1099 msymbol
= lookup_minimal_symbol ("__shldp", NULL
, NULL
);
1100 symbol2
= lookup_symbol ("__shldp", NULL
, VAR_DOMAIN
, NULL
, NULL
);
1101 endo_buff_addr
= SYMBOL_VALUE_ADDRESS (buff_minsym
);
1102 namelen
= strlen (DEPRECATED_SYMBOL_NAME (function
));
1103 value_return_addr
= endo_buff_addr
+ namelen
;
1104 ftype
= check_typedef (SYMBOL_TYPE (get_sym
));
1107 if ((x
= value_return_addr
% 64) != 0)
1108 value_return_addr
= value_return_addr
+ 64 - x
;
1110 errno_return_addr
= value_return_addr
+ 64;
1113 /* set up stuff needed by __d_shl_get in buffer in end.o */
1115 target_write_memory (endo_buff_addr
, DEPRECATED_SYMBOL_NAME (function
), namelen
);
1117 target_write_memory (value_return_addr
, (char *) &tmp
, 4);
1119 target_write_memory (errno_return_addr
, (char *) &tmp
, 4);
1121 target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol
),
1122 (char *) &handle
, 4);
1124 /* now prepare the arguments for the call */
1126 args
[0] = value_from_longest (TYPE_FIELD_TYPE (ftype
, 0), 12);
1127 args
[1] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 1), SYMBOL_VALUE_ADDRESS (msymbol
));
1128 args
[2] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 2), endo_buff_addr
);
1129 args
[3] = value_from_longest (TYPE_FIELD_TYPE (ftype
, 3), TYPE_PROCEDURE
);
1130 args
[4] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 4), value_return_addr
);
1131 args
[5] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 5), errno_return_addr
);
1133 /* now call the function */
1135 val
= call_function_by_hand (funcval
, 6, args
);
1137 /* now get the results */
1139 target_read_memory (errno_return_addr
, (char *) &err_value
, sizeof (err_value
));
1141 target_read_memory (value_return_addr
, (char *) &stub_addr
, sizeof (stub_addr
));
1143 error ("call to __d_shl_get failed, error code is %d", err_value
);
1148 /* Cover routine for find_stub_with_shl_get to pass to catch_errors */
1150 cover_find_stub_with_shl_get (void *args_untyped
)
1152 args_for_find_stub
*args
= args_untyped
;
1153 args
->return_val
= find_stub_with_shl_get (args
->msym
, args
->solib_handle
);
1157 /* Get the PC from %r31 if currently in a syscall. Also mask out privilege
1161 hppa_target_read_pc (ptid_t ptid
)
1163 int flags
= read_register_pid (FLAGS_REGNUM
, ptid
);
1165 /* The following test does not belong here. It is OS-specific, and belongs
1167 /* Test SS_INSYSCALL */
1169 return read_register_pid (31, ptid
) & ~0x3;
1171 return read_register_pid (PCOQ_HEAD_REGNUM
, ptid
) & ~0x3;
1174 /* Write out the PC. If currently in a syscall, then also write the new
1175 PC value into %r31. */
1178 hppa_target_write_pc (CORE_ADDR v
, ptid_t ptid
)
1180 int flags
= read_register_pid (FLAGS_REGNUM
, ptid
);
1182 /* The following test does not belong here. It is OS-specific, and belongs
1184 /* If in a syscall, then set %r31. Also make sure to get the
1185 privilege bits set correctly. */
1186 /* Test SS_INSYSCALL */
1188 write_register_pid (31, v
| 0x3, ptid
);
1190 write_register_pid (PCOQ_HEAD_REGNUM
, v
, ptid
);
1191 write_register_pid (PCOQ_TAIL_REGNUM
, v
+ 4, ptid
);
1194 /* return the alignment of a type in bytes. Structures have the maximum
1195 alignment required by their fields. */
1198 hppa_alignof (struct type
*type
)
1200 int max_align
, align
, i
;
1201 CHECK_TYPEDEF (type
);
1202 switch (TYPE_CODE (type
))
1207 return TYPE_LENGTH (type
);
1208 case TYPE_CODE_ARRAY
:
1209 return hppa_alignof (TYPE_FIELD_TYPE (type
, 0));
1210 case TYPE_CODE_STRUCT
:
1211 case TYPE_CODE_UNION
:
1213 for (i
= 0; i
< TYPE_NFIELDS (type
); i
++)
1215 /* Bit fields have no real alignment. */
1216 /* if (!TYPE_FIELD_BITPOS (type, i)) */
1217 if (!TYPE_FIELD_BITSIZE (type
, i
)) /* elz: this should be bitsize */
1219 align
= hppa_alignof (TYPE_FIELD_TYPE (type
, i
));
1220 max_align
= max (max_align
, align
);
1229 /* Return one if PC is in the call path of a trampoline, else return zero.
1231 Note we return one for *any* call trampoline (long-call, arg-reloc), not
1232 just shared library trampolines (import, export). */
1235 hppa_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
1237 struct minimal_symbol
*minsym
;
1238 struct unwind_table_entry
*u
;
1239 static CORE_ADDR dyncall
= 0;
1240 static CORE_ADDR sr4export
= 0;
1242 #ifdef GDB_TARGET_IS_HPPA_20W
1243 /* PA64 has a completely different stub/trampoline scheme. Is it
1244 better? Maybe. It's certainly harder to determine with any
1245 certainty that we are in a stub because we can not refer to the
1248 The heuristic is simple. Try to lookup the current PC value in th
1249 minimal symbol table. If that fails, then assume we are not in a
1252 Then see if the PC value falls within the section bounds for the
1253 section containing the minimal symbol we found in the first
1254 step. If it does, then assume we are not in a stub and return.
1256 Finally peek at the instructions to see if they look like a stub. */
1258 struct minimal_symbol
*minsym
;
1263 minsym
= lookup_minimal_symbol_by_pc (pc
);
1267 sec
= SYMBOL_BFD_SECTION (minsym
);
1269 if (bfd_get_section_vma (sec
->owner
, sec
) <= pc
1270 && pc
< (bfd_get_section_vma (sec
->owner
, sec
)
1271 + bfd_section_size (sec
->owner
, sec
)))
1274 /* We might be in a stub. Peek at the instructions. Stubs are 3
1275 instructions long. */
1276 insn
= read_memory_integer (pc
, 4);
1278 /* Find out where we think we are within the stub. */
1279 if ((insn
& 0xffffc00e) == 0x53610000)
1281 else if ((insn
& 0xffffffff) == 0xe820d000)
1283 else if ((insn
& 0xffffc00e) == 0x537b0000)
1288 /* Now verify each insn in the range looks like a stub instruction. */
1289 insn
= read_memory_integer (addr
, 4);
1290 if ((insn
& 0xffffc00e) != 0x53610000)
1293 /* Now verify each insn in the range looks like a stub instruction. */
1294 insn
= read_memory_integer (addr
+ 4, 4);
1295 if ((insn
& 0xffffffff) != 0xe820d000)
1298 /* Now verify each insn in the range looks like a stub instruction. */
1299 insn
= read_memory_integer (addr
+ 8, 4);
1300 if ((insn
& 0xffffc00e) != 0x537b0000)
1303 /* Looks like a stub. */
1308 /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a
1311 /* First see if PC is in one of the two C-library trampolines. */
1314 minsym
= lookup_minimal_symbol ("$$dyncall", NULL
, NULL
);
1316 dyncall
= SYMBOL_VALUE_ADDRESS (minsym
);
1323 minsym
= lookup_minimal_symbol ("_sr4export", NULL
, NULL
);
1325 sr4export
= SYMBOL_VALUE_ADDRESS (minsym
);
1330 if (pc
== dyncall
|| pc
== sr4export
)
1333 minsym
= lookup_minimal_symbol_by_pc (pc
);
1334 if (minsym
&& strcmp (DEPRECATED_SYMBOL_NAME (minsym
), ".stub") == 0)
1337 /* Get the unwind descriptor corresponding to PC, return zero
1338 if no unwind was found. */
1339 u
= find_unwind_entry (pc
);
1343 /* If this isn't a linker stub, then return now. */
1344 if (u
->stub_unwind
.stub_type
== 0)
1347 /* By definition a long-branch stub is a call stub. */
1348 if (u
->stub_unwind
.stub_type
== LONG_BRANCH
)
1351 /* The call and return path execute the same instructions within
1352 an IMPORT stub! So an IMPORT stub is both a call and return
1354 if (u
->stub_unwind
.stub_type
== IMPORT
)
1357 /* Parameter relocation stubs always have a call path and may have a
1359 if (u
->stub_unwind
.stub_type
== PARAMETER_RELOCATION
1360 || u
->stub_unwind
.stub_type
== EXPORT
)
1364 /* Search forward from the current PC until we hit a branch
1365 or the end of the stub. */
1366 for (addr
= pc
; addr
<= u
->region_end
; addr
+= 4)
1370 insn
= read_memory_integer (addr
, 4);
1372 /* Does it look like a bl? If so then it's the call path, if
1373 we find a bv or be first, then we're on the return path. */
1374 if ((insn
& 0xfc00e000) == 0xe8000000)
1376 else if ((insn
& 0xfc00e001) == 0xe800c000
1377 || (insn
& 0xfc000000) == 0xe0000000)
1381 /* Should never happen. */
1382 warning ("Unable to find branch in parameter relocation stub.\n");
1386 /* Unknown stub type. For now, just return zero. */
1390 /* Return one if PC is in the return path of a trampoline, else return zero.
1392 Note we return one for *any* call trampoline (long-call, arg-reloc), not
1393 just shared library trampolines (import, export). */
1396 hppa_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
1398 struct unwind_table_entry
*u
;
1400 /* Get the unwind descriptor corresponding to PC, return zero
1401 if no unwind was found. */
1402 u
= find_unwind_entry (pc
);
1406 /* If this isn't a linker stub or it's just a long branch stub, then
1408 if (u
->stub_unwind
.stub_type
== 0 || u
->stub_unwind
.stub_type
== LONG_BRANCH
)
1411 /* The call and return path execute the same instructions within
1412 an IMPORT stub! So an IMPORT stub is both a call and return
1414 if (u
->stub_unwind
.stub_type
== IMPORT
)
1417 /* Parameter relocation stubs always have a call path and may have a
1419 if (u
->stub_unwind
.stub_type
== PARAMETER_RELOCATION
1420 || u
->stub_unwind
.stub_type
== EXPORT
)
1424 /* Search forward from the current PC until we hit a branch
1425 or the end of the stub. */
1426 for (addr
= pc
; addr
<= u
->region_end
; addr
+= 4)
1430 insn
= read_memory_integer (addr
, 4);
1432 /* Does it look like a bl? If so then it's the call path, if
1433 we find a bv or be first, then we're on the return path. */
1434 if ((insn
& 0xfc00e000) == 0xe8000000)
1436 else if ((insn
& 0xfc00e001) == 0xe800c000
1437 || (insn
& 0xfc000000) == 0xe0000000)
1441 /* Should never happen. */
1442 warning ("Unable to find branch in parameter relocation stub.\n");
1446 /* Unknown stub type. For now, just return zero. */
1451 /* Figure out if PC is in a trampoline, and if so find out where
1452 the trampoline will jump to. If not in a trampoline, return zero.
1454 Simple code examination probably is not a good idea since the code
1455 sequences in trampolines can also appear in user code.
1457 We use unwinds and information from the minimal symbol table to
1458 determine when we're in a trampoline. This won't work for ELF
1459 (yet) since it doesn't create stub unwind entries. Whether or
1460 not ELF will create stub unwinds or normal unwinds for linker
1461 stubs is still being debated.
1463 This should handle simple calls through dyncall or sr4export,
1464 long calls, argument relocation stubs, and dyncall/sr4export
1465 calling an argument relocation stub. It even handles some stubs
1466 used in dynamic executables. */
1469 hppa_skip_trampoline_code (CORE_ADDR pc
)
1472 long prev_inst
, curr_inst
, loc
;
1473 static CORE_ADDR dyncall
= 0;
1474 static CORE_ADDR dyncall_external
= 0;
1475 static CORE_ADDR sr4export
= 0;
1476 struct minimal_symbol
*msym
;
1477 struct unwind_table_entry
*u
;
1479 /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a
1484 msym
= lookup_minimal_symbol ("$$dyncall", NULL
, NULL
);
1486 dyncall
= SYMBOL_VALUE_ADDRESS (msym
);
1491 if (!dyncall_external
)
1493 msym
= lookup_minimal_symbol ("$$dyncall_external", NULL
, NULL
);
1495 dyncall_external
= SYMBOL_VALUE_ADDRESS (msym
);
1497 dyncall_external
= -1;
1502 msym
= lookup_minimal_symbol ("_sr4export", NULL
, NULL
);
1504 sr4export
= SYMBOL_VALUE_ADDRESS (msym
);
1509 /* Addresses passed to dyncall may *NOT* be the actual address
1510 of the function. So we may have to do something special. */
1513 pc
= (CORE_ADDR
) read_register (22);
1515 /* If bit 30 (counting from the left) is on, then pc is the address of
1516 the PLT entry for this function, not the address of the function
1517 itself. Bit 31 has meaning too, but only for MPE. */
1519 pc
= (CORE_ADDR
) read_memory_integer (pc
& ~0x3, TARGET_PTR_BIT
/ 8);
1521 if (pc
== dyncall_external
)
1523 pc
= (CORE_ADDR
) read_register (22);
1524 pc
= (CORE_ADDR
) read_memory_integer (pc
& ~0x3, TARGET_PTR_BIT
/ 8);
1526 else if (pc
== sr4export
)
1527 pc
= (CORE_ADDR
) (read_register (22));
1529 /* Get the unwind descriptor corresponding to PC, return zero
1530 if no unwind was found. */
1531 u
= find_unwind_entry (pc
);
1535 /* If this isn't a linker stub, then return now. */
1536 /* elz: attention here! (FIXME) because of a compiler/linker
1537 error, some stubs which should have a non zero stub_unwind.stub_type
1538 have unfortunately a value of zero. So this function would return here
1539 as if we were not in a trampoline. To fix this, we go look at the partial
1540 symbol information, which reports this guy as a stub.
1541 (FIXME): Unfortunately, we are not that lucky: it turns out that the
1542 partial symbol information is also wrong sometimes. This is because
1543 when it is entered (somread.c::som_symtab_read()) it can happen that
1544 if the type of the symbol (from the som) is Entry, and the symbol is
1545 in a shared library, then it can also be a trampoline. This would
1546 be OK, except that I believe the way they decide if we are ina shared library
1547 does not work. SOOOO..., even if we have a regular function w/o trampolines
1548 its minimal symbol can be assigned type mst_solib_trampoline.
1549 Also, if we find that the symbol is a real stub, then we fix the unwind
1550 descriptor, and define the stub type to be EXPORT.
1551 Hopefully this is correct most of the times. */
1552 if (u
->stub_unwind
.stub_type
== 0)
1555 /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed
1556 we can delete all the code which appears between the lines */
1557 /*--------------------------------------------------------------------------*/
1558 msym
= lookup_minimal_symbol_by_pc (pc
);
1560 if (msym
== NULL
|| MSYMBOL_TYPE (msym
) != mst_solib_trampoline
)
1561 return orig_pc
== pc
? 0 : pc
& ~0x3;
1563 else if (msym
!= NULL
&& MSYMBOL_TYPE (msym
) == mst_solib_trampoline
)
1565 struct objfile
*objfile
;
1566 struct minimal_symbol
*msymbol
;
1567 int function_found
= 0;
1569 /* go look if there is another minimal symbol with the same name as
1570 this one, but with type mst_text. This would happen if the msym
1571 is an actual trampoline, in which case there would be another
1572 symbol with the same name corresponding to the real function */
1574 ALL_MSYMBOLS (objfile
, msymbol
)
1576 if (MSYMBOL_TYPE (msymbol
) == mst_text
1577 && DEPRECATED_STREQ (DEPRECATED_SYMBOL_NAME (msymbol
), DEPRECATED_SYMBOL_NAME (msym
)))
1585 /* the type of msym is correct (mst_solib_trampoline), but
1586 the unwind info is wrong, so set it to the correct value */
1587 u
->stub_unwind
.stub_type
= EXPORT
;
1589 /* the stub type info in the unwind is correct (this is not a
1590 trampoline), but the msym type information is wrong, it
1591 should be mst_text. So we need to fix the msym, and also
1592 get out of this function */
1594 MSYMBOL_TYPE (msym
) = mst_text
;
1595 return orig_pc
== pc
? 0 : pc
& ~0x3;
1599 /*--------------------------------------------------------------------------*/
1602 /* It's a stub. Search for a branch and figure out where it goes.
1603 Note we have to handle multi insn branch sequences like ldil;ble.
1604 Most (all?) other branches can be determined by examining the contents
1605 of certain registers and the stack. */
1612 /* Make sure we haven't walked outside the range of this stub. */
1613 if (u
!= find_unwind_entry (loc
))
1615 warning ("Unable to find branch in linker stub");
1616 return orig_pc
== pc
? 0 : pc
& ~0x3;
1619 prev_inst
= curr_inst
;
1620 curr_inst
= read_memory_integer (loc
, 4);
1622 /* Does it look like a branch external using %r1? Then it's the
1623 branch from the stub to the actual function. */
1624 if ((curr_inst
& 0xffe0e000) == 0xe0202000)
1626 /* Yup. See if the previous instruction loaded
1627 a value into %r1. If so compute and return the jump address. */
1628 if ((prev_inst
& 0xffe00000) == 0x20200000)
1629 return (extract_21 (prev_inst
) + extract_17 (curr_inst
)) & ~0x3;
1632 warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1).");
1633 return orig_pc
== pc
? 0 : pc
& ~0x3;
1637 /* Does it look like a be 0(sr0,%r21)? OR
1638 Does it look like a be, n 0(sr0,%r21)? OR
1639 Does it look like a bve (r21)? (this is on PA2.0)
1640 Does it look like a bve, n(r21)? (this is also on PA2.0)
1641 That's the branch from an
1642 import stub to an export stub.
1644 It is impossible to determine the target of the branch via
1645 simple examination of instructions and/or data (consider
1646 that the address in the plabel may be the address of the
1647 bind-on-reference routine in the dynamic loader).
1649 So we have try an alternative approach.
1651 Get the name of the symbol at our current location; it should
1652 be a stub symbol with the same name as the symbol in the
1655 Then lookup a minimal symbol with the same name; we should
1656 get the minimal symbol for the target routine in the shared
1657 library as those take precedence of import/export stubs. */
1658 if ((curr_inst
== 0xe2a00000) ||
1659 (curr_inst
== 0xe2a00002) ||
1660 (curr_inst
== 0xeaa0d000) ||
1661 (curr_inst
== 0xeaa0d002))
1663 struct minimal_symbol
*stubsym
, *libsym
;
1665 stubsym
= lookup_minimal_symbol_by_pc (loc
);
1666 if (stubsym
== NULL
)
1668 warning ("Unable to find symbol for 0x%lx", loc
);
1669 return orig_pc
== pc
? 0 : pc
& ~0x3;
1672 libsym
= lookup_minimal_symbol (DEPRECATED_SYMBOL_NAME (stubsym
), NULL
, NULL
);
1675 warning ("Unable to find library symbol for %s\n",
1676 DEPRECATED_SYMBOL_NAME (stubsym
));
1677 return orig_pc
== pc
? 0 : pc
& ~0x3;
1680 return SYMBOL_VALUE (libsym
);
1683 /* Does it look like bl X,%rp or bl X,%r0? Another way to do a
1684 branch from the stub to the actual function. */
1686 else if ((curr_inst
& 0xffe0e000) == 0xe8400000
1687 || (curr_inst
& 0xffe0e000) == 0xe8000000
1688 || (curr_inst
& 0xffe0e000) == 0xe800A000)
1689 return (loc
+ extract_17 (curr_inst
) + 8) & ~0x3;
1691 /* Does it look like bv (rp)? Note this depends on the
1692 current stack pointer being the same as the stack
1693 pointer in the stub itself! This is a branch on from the
1694 stub back to the original caller. */
1695 /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */
1696 else if ((curr_inst
& 0xffe0f000) == 0xe840c000)
1698 /* Yup. See if the previous instruction loaded
1700 if (prev_inst
== 0x4bc23ff1)
1701 return (read_memory_integer
1702 (read_register (HPPA_SP_REGNUM
) - 8, 4)) & ~0x3;
1705 warning ("Unable to find restore of %%rp before bv (%%rp).");
1706 return orig_pc
== pc
? 0 : pc
& ~0x3;
1710 /* elz: added this case to capture the new instruction
1711 at the end of the return part of an export stub used by
1712 the PA2.0: BVE, n (rp) */
1713 else if ((curr_inst
& 0xffe0f000) == 0xe840d000)
1715 return (read_memory_integer
1716 (read_register (HPPA_SP_REGNUM
) - 24, TARGET_PTR_BIT
/ 8)) & ~0x3;
1719 /* What about be,n 0(sr0,%rp)? It's just another way we return to
1720 the original caller from the stub. Used in dynamic executables. */
1721 else if (curr_inst
== 0xe0400002)
1723 /* The value we jump to is sitting in sp - 24. But that's
1724 loaded several instructions before the be instruction.
1725 I guess we could check for the previous instruction being
1726 mtsp %r1,%sr0 if we want to do sanity checking. */
1727 return (read_memory_integer
1728 (read_register (HPPA_SP_REGNUM
) - 24, TARGET_PTR_BIT
/ 8)) & ~0x3;
1731 /* Haven't found the branch yet, but we're still in the stub.
1738 /* For the given instruction (INST), return any adjustment it makes
1739 to the stack pointer or zero for no adjustment.
1741 This only handles instructions commonly found in prologues. */
1744 prologue_inst_adjust_sp (unsigned long inst
)
1746 /* This must persist across calls. */
1747 static int save_high21
;
1749 /* The most common way to perform a stack adjustment ldo X(sp),sp */
1750 if ((inst
& 0xffffc000) == 0x37de0000)
1751 return extract_14 (inst
);
1754 if ((inst
& 0xffe00000) == 0x6fc00000)
1755 return extract_14 (inst
);
1757 /* std,ma X,D(sp) */
1758 if ((inst
& 0xffe00008) == 0x73c00008)
1759 return (inst
& 0x1 ? -1 << 13 : 0) | (((inst
>> 4) & 0x3ff) << 3);
1761 /* addil high21,%r1; ldo low11,(%r1),%r30)
1762 save high bits in save_high21 for later use. */
1763 if ((inst
& 0xffe00000) == 0x28200000)
1765 save_high21
= extract_21 (inst
);
1769 if ((inst
& 0xffff0000) == 0x343e0000)
1770 return save_high21
+ extract_14 (inst
);
1772 /* fstws as used by the HP compilers. */
1773 if ((inst
& 0xffffffe0) == 0x2fd01220)
1774 return extract_5_load (inst
);
1776 /* No adjustment. */
1780 /* Return nonzero if INST is a branch of some kind, else return zero. */
1783 is_branch (unsigned long inst
)
1812 /* Return the register number for a GR which is saved by INST or
1813 zero it INST does not save a GR. */
1816 inst_saves_gr (unsigned long inst
)
1818 /* Does it look like a stw? */
1819 if ((inst
>> 26) == 0x1a || (inst
>> 26) == 0x1b
1820 || (inst
>> 26) == 0x1f
1821 || ((inst
>> 26) == 0x1f
1822 && ((inst
>> 6) == 0xa)))
1823 return extract_5R_store (inst
);
1825 /* Does it look like a std? */
1826 if ((inst
>> 26) == 0x1c
1827 || ((inst
>> 26) == 0x03
1828 && ((inst
>> 6) & 0xf) == 0xb))
1829 return extract_5R_store (inst
);
1831 /* Does it look like a stwm? GCC & HPC may use this in prologues. */
1832 if ((inst
>> 26) == 0x1b)
1833 return extract_5R_store (inst
);
1835 /* Does it look like sth or stb? HPC versions 9.0 and later use these
1837 if ((inst
>> 26) == 0x19 || (inst
>> 26) == 0x18
1838 || ((inst
>> 26) == 0x3
1839 && (((inst
>> 6) & 0xf) == 0x8
1840 || (inst
>> 6) & 0xf) == 0x9))
1841 return extract_5R_store (inst
);
1846 /* Return the register number for a FR which is saved by INST or
1847 zero it INST does not save a FR.
1849 Note we only care about full 64bit register stores (that's the only
1850 kind of stores the prologue will use).
1852 FIXME: What about argument stores with the HP compiler in ANSI mode? */
1855 inst_saves_fr (unsigned long inst
)
1857 /* is this an FSTD ? */
1858 if ((inst
& 0xfc00dfc0) == 0x2c001200)
1859 return extract_5r_store (inst
);
1860 if ((inst
& 0xfc000002) == 0x70000002)
1861 return extract_5R_store (inst
);
1862 /* is this an FSTW ? */
1863 if ((inst
& 0xfc00df80) == 0x24001200)
1864 return extract_5r_store (inst
);
1865 if ((inst
& 0xfc000002) == 0x7c000000)
1866 return extract_5R_store (inst
);
1870 /* Advance PC across any function entry prologue instructions
1871 to reach some "real" code.
1873 Use information in the unwind table to determine what exactly should
1874 be in the prologue. */
1878 skip_prologue_hard_way (CORE_ADDR pc
)
1881 CORE_ADDR orig_pc
= pc
;
1882 unsigned long inst
, stack_remaining
, save_gr
, save_fr
, save_rp
, save_sp
;
1883 unsigned long args_stored
, status
, i
, restart_gr
, restart_fr
;
1884 struct unwind_table_entry
*u
;
1890 u
= find_unwind_entry (pc
);
1894 /* If we are not at the beginning of a function, then return now. */
1895 if ((pc
& ~0x3) != u
->region_start
)
1898 /* This is how much of a frame adjustment we need to account for. */
1899 stack_remaining
= u
->Total_frame_size
<< 3;
1901 /* Magic register saves we want to know about. */
1902 save_rp
= u
->Save_RP
;
1903 save_sp
= u
->Save_SP
;
1905 /* An indication that args may be stored into the stack. Unfortunately
1906 the HPUX compilers tend to set this in cases where no args were
1910 /* Turn the Entry_GR field into a bitmask. */
1912 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
1914 /* Frame pointer gets saved into a special location. */
1915 if (u
->Save_SP
&& i
== HPPA_FP_REGNUM
)
1918 save_gr
|= (1 << i
);
1920 save_gr
&= ~restart_gr
;
1922 /* Turn the Entry_FR field into a bitmask too. */
1924 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
1925 save_fr
|= (1 << i
);
1926 save_fr
&= ~restart_fr
;
1928 /* Loop until we find everything of interest or hit a branch.
1930 For unoptimized GCC code and for any HP CC code this will never ever
1931 examine any user instructions.
1933 For optimzied GCC code we're faced with problems. GCC will schedule
1934 its prologue and make prologue instructions available for delay slot
1935 filling. The end result is user code gets mixed in with the prologue
1936 and a prologue instruction may be in the delay slot of the first branch
1939 Some unexpected things are expected with debugging optimized code, so
1940 we allow this routine to walk past user instructions in optimized
1942 while (save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0
1945 unsigned int reg_num
;
1946 unsigned long old_stack_remaining
, old_save_gr
, old_save_fr
;
1947 unsigned long old_save_rp
, old_save_sp
, next_inst
;
1949 /* Save copies of all the triggers so we can compare them later
1951 old_save_gr
= save_gr
;
1952 old_save_fr
= save_fr
;
1953 old_save_rp
= save_rp
;
1954 old_save_sp
= save_sp
;
1955 old_stack_remaining
= stack_remaining
;
1957 status
= target_read_memory (pc
, buf
, 4);
1958 inst
= extract_unsigned_integer (buf
, 4);
1964 /* Note the interesting effects of this instruction. */
1965 stack_remaining
-= prologue_inst_adjust_sp (inst
);
1967 /* There are limited ways to store the return pointer into the
1969 if (inst
== 0x6bc23fd9 || inst
== 0x0fc212c1)
1972 /* These are the only ways we save SP into the stack. At this time
1973 the HP compilers never bother to save SP into the stack. */
1974 if ((inst
& 0xffffc000) == 0x6fc10000
1975 || (inst
& 0xffffc00c) == 0x73c10008)
1978 /* Are we loading some register with an offset from the argument
1980 if ((inst
& 0xffe00000) == 0x37a00000
1981 || (inst
& 0xffffffe0) == 0x081d0240)
1987 /* Account for general and floating-point register saves. */
1988 reg_num
= inst_saves_gr (inst
);
1989 save_gr
&= ~(1 << reg_num
);
1991 /* Ugh. Also account for argument stores into the stack.
1992 Unfortunately args_stored only tells us that some arguments
1993 where stored into the stack. Not how many or what kind!
1995 This is a kludge as on the HP compiler sets this bit and it
1996 never does prologue scheduling. So once we see one, skip past
1997 all of them. We have similar code for the fp arg stores below.
1999 FIXME. Can still die if we have a mix of GR and FR argument
2001 if (reg_num
>= (TARGET_PTR_BIT
== 64 ? 19 : 23) && reg_num
<= 26)
2003 while (reg_num
>= (TARGET_PTR_BIT
== 64 ? 19 : 23) && reg_num
<= 26)
2006 status
= target_read_memory (pc
, buf
, 4);
2007 inst
= extract_unsigned_integer (buf
, 4);
2010 reg_num
= inst_saves_gr (inst
);
2016 reg_num
= inst_saves_fr (inst
);
2017 save_fr
&= ~(1 << reg_num
);
2019 status
= target_read_memory (pc
+ 4, buf
, 4);
2020 next_inst
= extract_unsigned_integer (buf
, 4);
2026 /* We've got to be read to handle the ldo before the fp register
2028 if ((inst
& 0xfc000000) == 0x34000000
2029 && inst_saves_fr (next_inst
) >= 4
2030 && inst_saves_fr (next_inst
) <= (TARGET_PTR_BIT
== 64 ? 11 : 7))
2032 /* So we drop into the code below in a reasonable state. */
2033 reg_num
= inst_saves_fr (next_inst
);
2037 /* Ugh. Also account for argument stores into the stack.
2038 This is a kludge as on the HP compiler sets this bit and it
2039 never does prologue scheduling. So once we see one, skip past
2041 if (reg_num
>= 4 && reg_num
<= (TARGET_PTR_BIT
== 64 ? 11 : 7))
2043 while (reg_num
>= 4 && reg_num
<= (TARGET_PTR_BIT
== 64 ? 11 : 7))
2046 status
= target_read_memory (pc
, buf
, 4);
2047 inst
= extract_unsigned_integer (buf
, 4);
2050 if ((inst
& 0xfc000000) != 0x34000000)
2052 status
= target_read_memory (pc
+ 4, buf
, 4);
2053 next_inst
= extract_unsigned_integer (buf
, 4);
2056 reg_num
= inst_saves_fr (next_inst
);
2062 /* Quit if we hit any kind of branch. This can happen if a prologue
2063 instruction is in the delay slot of the first call/branch. */
2064 if (is_branch (inst
))
2067 /* What a crock. The HP compilers set args_stored even if no
2068 arguments were stored into the stack (boo hiss). This could
2069 cause this code to then skip a bunch of user insns (up to the
2072 To combat this we try to identify when args_stored was bogusly
2073 set and clear it. We only do this when args_stored is nonzero,
2074 all other resources are accounted for, and nothing changed on
2077 && !(save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0)
2078 && old_save_gr
== save_gr
&& old_save_fr
== save_fr
2079 && old_save_rp
== save_rp
&& old_save_sp
== save_sp
2080 && old_stack_remaining
== stack_remaining
)
2087 /* We've got a tenative location for the end of the prologue. However
2088 because of limitations in the unwind descriptor mechanism we may
2089 have went too far into user code looking for the save of a register
2090 that does not exist. So, if there registers we expected to be saved
2091 but never were, mask them out and restart.
2093 This should only happen in optimized code, and should be very rare. */
2094 if (save_gr
|| (save_fr
&& !(restart_fr
|| restart_gr
)))
2097 restart_gr
= save_gr
;
2098 restart_fr
= save_fr
;
2106 /* Return the address of the PC after the last prologue instruction if
2107 we can determine it from the debug symbols. Else return zero. */
2110 after_prologue (CORE_ADDR pc
)
2112 struct symtab_and_line sal
;
2113 CORE_ADDR func_addr
, func_end
;
2116 /* If we can not find the symbol in the partial symbol table, then
2117 there is no hope we can determine the function's start address
2119 if (!find_pc_partial_function (pc
, NULL
, &func_addr
, &func_end
))
2122 /* Get the line associated with FUNC_ADDR. */
2123 sal
= find_pc_line (func_addr
, 0);
2125 /* There are only two cases to consider. First, the end of the source line
2126 is within the function bounds. In that case we return the end of the
2127 source line. Second is the end of the source line extends beyond the
2128 bounds of the current function. We need to use the slow code to
2129 examine instructions in that case.
2131 Anything else is simply a bug elsewhere. Fixing it here is absolutely
2132 the wrong thing to do. In fact, it should be entirely possible for this
2133 function to always return zero since the slow instruction scanning code
2134 is supposed to *always* work. If it does not, then it is a bug. */
2135 if (sal
.end
< func_end
)
2141 /* To skip prologues, I use this predicate. Returns either PC itself
2142 if the code at PC does not look like a function prologue; otherwise
2143 returns an address that (if we're lucky) follows the prologue. If
2144 LENIENT, then we must skip everything which is involved in setting
2145 up the frame (it's OK to skip more, just so long as we don't skip
2146 anything which might clobber the registers which are being saved.
2147 Currently we must not skip more on the alpha, but we might the lenient
2151 hppa_skip_prologue (CORE_ADDR pc
)
2155 CORE_ADDR post_prologue_pc
;
2158 /* See if we can determine the end of the prologue via the symbol table.
2159 If so, then return either PC, or the PC after the prologue, whichever
2162 post_prologue_pc
= after_prologue (pc
);
2164 /* If after_prologue returned a useful address, then use it. Else
2165 fall back on the instruction skipping code.
2167 Some folks have claimed this causes problems because the breakpoint
2168 may be the first instruction of the prologue. If that happens, then
2169 the instruction skipping code has a bug that needs to be fixed. */
2170 if (post_prologue_pc
!= 0)
2171 return max (pc
, post_prologue_pc
);
2173 return (skip_prologue_hard_way (pc
));
2176 struct hppa_frame_cache
2179 struct trad_frame_saved_reg
*saved_regs
;
2182 static struct hppa_frame_cache
*
2183 hppa_frame_cache (struct frame_info
*next_frame
, void **this_cache
)
2185 struct hppa_frame_cache
*cache
;
2190 struct unwind_table_entry
*u
;
2193 if ((*this_cache
) != NULL
)
2194 return (*this_cache
);
2195 cache
= FRAME_OBSTACK_ZALLOC (struct hppa_frame_cache
);
2196 (*this_cache
) = cache
;
2197 cache
->saved_regs
= trad_frame_alloc_saved_regs (next_frame
);
2200 u
= find_unwind_entry (frame_func_unwind (next_frame
));
2202 return (*this_cache
);
2204 /* Turn the Entry_GR field into a bitmask. */
2206 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
2208 /* Frame pointer gets saved into a special location. */
2209 if (u
->Save_SP
&& i
== HPPA_FP_REGNUM
)
2212 saved_gr_mask
|= (1 << i
);
2215 /* Turn the Entry_FR field into a bitmask too. */
2217 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
2218 saved_fr_mask
|= (1 << i
);
2220 /* Loop until we find everything of interest or hit a branch.
2222 For unoptimized GCC code and for any HP CC code this will never ever
2223 examine any user instructions.
2225 For optimized GCC code we're faced with problems. GCC will schedule
2226 its prologue and make prologue instructions available for delay slot
2227 filling. The end result is user code gets mixed in with the prologue
2228 and a prologue instruction may be in the delay slot of the first branch
2231 Some unexpected things are expected with debugging optimized code, so
2232 we allow this routine to walk past user instructions in optimized
2235 int final_iteration
= 0;
2238 int looking_for_sp
= u
->Save_SP
;
2239 int looking_for_rp
= u
->Save_RP
;
2241 end_pc
= skip_prologue_using_sal (frame_func_unwind (next_frame
));
2243 end_pc
= frame_pc_unwind (next_frame
);
2245 for (pc
= frame_func_unwind (next_frame
);
2246 ((saved_gr_mask
|| saved_fr_mask
2247 || looking_for_sp
|| looking_for_rp
2248 || frame_size
< (u
->Total_frame_size
<< 3))
2254 long status
= target_read_memory (pc
, buf4
, sizeof buf4
);
2255 long inst
= extract_unsigned_integer (buf4
, sizeof buf4
);
2257 /* Note the interesting effects of this instruction. */
2258 frame_size
+= prologue_inst_adjust_sp (inst
);
2260 /* There are limited ways to store the return pointer into the
2262 if (inst
== 0x6bc23fd9) /* stw rp,-0x14(sr0,sp) */
2265 cache
->saved_regs
[RP_REGNUM
].addr
= -20;
2267 else if (inst
== 0x0fc212c1) /* std rp,-0x10(sr0,sp) */
2270 cache
->saved_regs
[RP_REGNUM
].addr
= -16;
2273 /* Check to see if we saved SP into the stack. This also
2274 happens to indicate the location of the saved frame
2276 if ((inst
& 0xffffc000) == 0x6fc10000 /* stw,ma r1,N(sr0,sp) */
2277 || (inst
& 0xffffc00c) == 0x73c10008) /* std,ma r1,N(sr0,sp) */
2280 cache
->saved_regs
[HPPA_FP_REGNUM
].addr
= 0;
2283 /* Account for general and floating-point register saves. */
2284 reg
= inst_saves_gr (inst
);
2285 if (reg
>= 3 && reg
<= 18
2286 && (!u
->Save_SP
|| reg
!= HPPA_FP_REGNUM
))
2288 saved_gr_mask
&= ~(1 << reg
);
2289 if ((inst
>> 26) == 0x1b && extract_14 (inst
) >= 0)
2290 /* stwm with a positive displacement is a _post_
2292 cache
->saved_regs
[reg
].addr
= 0;
2293 else if ((inst
& 0xfc00000c) == 0x70000008)
2294 /* A std has explicit post_modify forms. */
2295 cache
->saved_regs
[reg
].addr
= 0;
2300 if ((inst
>> 26) == 0x1c)
2301 offset
= (inst
& 0x1 ? -1 << 13 : 0) | (((inst
>> 4) & 0x3ff) << 3);
2302 else if ((inst
>> 26) == 0x03)
2303 offset
= low_sign_extend (inst
& 0x1f, 5);
2305 offset
= extract_14 (inst
);
2307 /* Handle code with and without frame pointers. */
2309 cache
->saved_regs
[reg
].addr
= offset
;
2311 cache
->saved_regs
[reg
].addr
= (u
->Total_frame_size
<< 3) + offset
;
2315 /* GCC handles callee saved FP regs a little differently.
2317 It emits an instruction to put the value of the start of
2318 the FP store area into %r1. It then uses fstds,ma with a
2319 basereg of %r1 for the stores.
2321 HP CC emits them at the current stack pointer modifying the
2322 stack pointer as it stores each register. */
2324 /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */
2325 if ((inst
& 0xffffc000) == 0x34610000
2326 || (inst
& 0xffffc000) == 0x37c10000)
2327 fp_loc
= extract_14 (inst
);
2329 reg
= inst_saves_fr (inst
);
2330 if (reg
>= 12 && reg
<= 21)
2332 /* Note +4 braindamage below is necessary because the FP
2333 status registers are internally 8 registers rather than
2334 the expected 4 registers. */
2335 saved_fr_mask
&= ~(1 << reg
);
2338 /* 1st HP CC FP register store. After this
2339 instruction we've set enough state that the GCC and
2340 HPCC code are both handled in the same manner. */
2341 cache
->saved_regs
[reg
+ FP4_REGNUM
+ 4].addr
= 0;
2346 cache
->saved_regs
[reg
+ HPPA_FP0_REGNUM
+ 4].addr
= fp_loc
;
2351 /* Quit if we hit any kind of branch the previous iteration. */
2352 if (final_iteration
)
2354 /* We want to look precisely one instruction beyond the branch
2355 if we have not found everything yet. */
2356 if (is_branch (inst
))
2357 final_iteration
= 1;
2362 /* The frame base always represents the value of %sp at entry to
2363 the current function (and is thus equivalent to the "saved"
2365 CORE_ADDR this_sp
= frame_unwind_register_unsigned (next_frame
, HPPA_SP_REGNUM
);
2366 /* FIXME: cagney/2004-02-22: This assumes that the frame has been
2367 created. If it hasn't everything will be out-of-wack. */
2368 if (u
->Save_SP
&& trad_frame_addr_p (cache
->saved_regs
, HPPA_SP_REGNUM
))
2369 /* Both we're expecting the SP to be saved and the SP has been
2370 saved. The entry SP value is saved at this frame's SP
2372 cache
->base
= read_memory_integer (this_sp
, TARGET_PTR_BIT
/ 8);
2374 /* The prologue has been slowly allocating stack space. Adjust
2376 cache
->base
= this_sp
- frame_size
;
2377 trad_frame_set_value (cache
->saved_regs
, HPPA_SP_REGNUM
, cache
->base
);
2380 /* The PC is found in the "return register", "Millicode" uses "r31"
2381 as the return register while normal code uses "rp". */
2383 cache
->saved_regs
[PCOQ_HEAD_REGNUM
] = cache
->saved_regs
[31];
2385 cache
->saved_regs
[PCOQ_HEAD_REGNUM
] = cache
->saved_regs
[RP_REGNUM
];
2388 /* Convert all the offsets into addresses. */
2390 for (reg
= 0; reg
< NUM_REGS
; reg
++)
2392 if (trad_frame_addr_p (cache
->saved_regs
, reg
))
2393 cache
->saved_regs
[reg
].addr
+= cache
->base
;
2397 return (*this_cache
);
2401 hppa_frame_this_id (struct frame_info
*next_frame
, void **this_cache
,
2402 struct frame_id
*this_id
)
2404 struct hppa_frame_cache
*info
= hppa_frame_cache (next_frame
, this_cache
);
2405 (*this_id
) = frame_id_build (info
->base
, frame_func_unwind (next_frame
));
2409 hppa_frame_prev_register (struct frame_info
*next_frame
,
2411 int regnum
, int *optimizedp
,
2412 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
2413 int *realnump
, void *valuep
)
2415 struct hppa_frame_cache
*info
= hppa_frame_cache (next_frame
, this_cache
);
2416 struct gdbarch
*gdbarch
= get_frame_arch (next_frame
);
2417 if (regnum
== PCOQ_TAIL_REGNUM
)
2419 /* The PCOQ TAIL, or NPC, needs to be computed from the unwound
2427 int regsize
= register_size (gdbarch
, PCOQ_HEAD_REGNUM
);
2430 enum lval_type lval
;
2433 bfd_byte value
[MAX_REGISTER_SIZE
];
2434 trad_frame_prev_register (next_frame
, info
->saved_regs
,
2435 PCOQ_HEAD_REGNUM
, &optimized
, &lval
, &addr
,
2437 pc
= extract_unsigned_integer (&value
, regsize
);
2438 store_unsigned_integer (valuep
, regsize
, pc
+ 4);
2443 trad_frame_prev_register (next_frame
, info
->saved_regs
, regnum
,
2444 optimizedp
, lvalp
, addrp
, realnump
, valuep
);
2448 static const struct frame_unwind hppa_frame_unwind
=
2452 hppa_frame_prev_register
2455 static const struct frame_unwind
*
2456 hppa_frame_unwind_sniffer (struct frame_info
*next_frame
)
2458 return &hppa_frame_unwind
;
2462 hppa_frame_base_address (struct frame_info
*next_frame
,
2465 struct hppa_frame_cache
*info
= hppa_frame_cache (next_frame
,
2470 static const struct frame_base hppa_frame_base
= {
2472 hppa_frame_base_address
,
2473 hppa_frame_base_address
,
2474 hppa_frame_base_address
2477 static const struct frame_base
*
2478 hppa_frame_base_sniffer (struct frame_info
*next_frame
)
2480 return &hppa_frame_base
;
2483 static struct frame_id
2484 hppa_unwind_dummy_id (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
2486 return frame_id_build (frame_unwind_register_unsigned (next_frame
,
2488 frame_pc_unwind (next_frame
));
2492 hppa_unwind_pc (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
2494 return frame_unwind_register_signed (next_frame
, PCOQ_HEAD_REGNUM
) & ~3;
2497 /* Exception handling support for the HP-UX ANSI C++ compiler.
2498 The compiler (aCC) provides a callback for exception events;
2499 GDB can set a breakpoint on this callback and find out what
2500 exception event has occurred. */
2502 /* The name of the hook to be set to point to the callback function */
2503 static char HP_ACC_EH_notify_hook
[] = "__eh_notify_hook";
2504 /* The name of the function to be used to set the hook value */
2505 static char HP_ACC_EH_set_hook_value
[] = "__eh_set_hook_value";
2506 /* The name of the callback function in end.o */
2507 static char HP_ACC_EH_notify_callback
[] = "__d_eh_notify_callback";
2508 /* Name of function in end.o on which a break is set (called by above) */
2509 static char HP_ACC_EH_break
[] = "__d_eh_break";
2510 /* Name of flag (in end.o) that enables catching throws */
2511 static char HP_ACC_EH_catch_throw
[] = "__d_eh_catch_throw";
2512 /* Name of flag (in end.o) that enables catching catching */
2513 static char HP_ACC_EH_catch_catch
[] = "__d_eh_catch_catch";
2514 /* The enum used by aCC */
2522 /* Is exception-handling support available with this executable? */
2523 static int hp_cxx_exception_support
= 0;
2524 /* Has the initialize function been run? */
2525 int hp_cxx_exception_support_initialized
= 0;
2526 /* Similar to above, but imported from breakpoint.c -- non-target-specific */
2527 extern int exception_support_initialized
;
2528 /* Address of __eh_notify_hook */
2529 static CORE_ADDR eh_notify_hook_addr
= 0;
2530 /* Address of __d_eh_notify_callback */
2531 static CORE_ADDR eh_notify_callback_addr
= 0;
2532 /* Address of __d_eh_break */
2533 static CORE_ADDR eh_break_addr
= 0;
2534 /* Address of __d_eh_catch_catch */
2535 static CORE_ADDR eh_catch_catch_addr
= 0;
2536 /* Address of __d_eh_catch_throw */
2537 static CORE_ADDR eh_catch_throw_addr
= 0;
2538 /* Sal for __d_eh_break */
2539 static struct symtab_and_line
*break_callback_sal
= 0;
2541 /* Code in end.c expects __d_pid to be set in the inferior,
2542 otherwise __d_eh_notify_callback doesn't bother to call
2543 __d_eh_break! So we poke the pid into this symbol
2548 setup_d_pid_in_inferior (void)
2551 struct minimal_symbol
*msymbol
;
2552 char buf
[4]; /* FIXME 32x64? */
2554 /* Slam the pid of the process into __d_pid; failing is only a warning! */
2555 msymbol
= lookup_minimal_symbol ("__d_pid", NULL
, symfile_objfile
);
2556 if (msymbol
== NULL
)
2558 warning ("Unable to find __d_pid symbol in object file.");
2559 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
2563 anaddr
= SYMBOL_VALUE_ADDRESS (msymbol
);
2564 store_unsigned_integer (buf
, 4, PIDGET (inferior_ptid
)); /* FIXME 32x64? */
2565 if (target_write_memory (anaddr
, buf
, 4)) /* FIXME 32x64? */
2567 warning ("Unable to write __d_pid");
2568 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
2574 /* Initialize exception catchpoint support by looking for the
2575 necessary hooks/callbacks in end.o, etc., and set the hook value to
2576 point to the required debug function
2582 initialize_hp_cxx_exception_support (void)
2584 struct symtabs_and_lines sals
;
2585 struct cleanup
*old_chain
;
2586 struct cleanup
*canonical_strings_chain
= NULL
;
2589 char *addr_end
= NULL
;
2590 char **canonical
= (char **) NULL
;
2592 struct symbol
*sym
= NULL
;
2593 struct minimal_symbol
*msym
= NULL
;
2594 struct objfile
*objfile
;
2595 asection
*shlib_info
;
2597 /* Detect and disallow recursion. On HP-UX with aCC, infinite
2598 recursion is a possibility because finding the hook for exception
2599 callbacks involves making a call in the inferior, which means
2600 re-inserting breakpoints which can re-invoke this code */
2602 static int recurse
= 0;
2605 hp_cxx_exception_support_initialized
= 0;
2606 exception_support_initialized
= 0;
2610 hp_cxx_exception_support
= 0;
2612 /* First check if we have seen any HP compiled objects; if not,
2613 it is very unlikely that HP's idiosyncratic callback mechanism
2614 for exception handling debug support will be available!
2615 This will percolate back up to breakpoint.c, where our callers
2616 will decide to try the g++ exception-handling support instead. */
2617 if (!hp_som_som_object_present
)
2620 /* We have a SOM executable with SOM debug info; find the hooks */
2622 /* First look for the notify hook provided by aCC runtime libs */
2623 /* If we find this symbol, we conclude that the executable must
2624 have HP aCC exception support built in. If this symbol is not
2625 found, even though we're a HP SOM-SOM file, we may have been
2626 built with some other compiler (not aCC). This results percolates
2627 back up to our callers in breakpoint.c which can decide to
2628 try the g++ style of exception support instead.
2629 If this symbol is found but the other symbols we require are
2630 not found, there is something weird going on, and g++ support
2631 should *not* be tried as an alternative.
2633 ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined.
2634 ASSUMPTION: HP aCC and g++ modules cannot be linked together. */
2636 /* libCsup has this hook; it'll usually be non-debuggable */
2637 msym
= lookup_minimal_symbol (HP_ACC_EH_notify_hook
, NULL
, NULL
);
2640 eh_notify_hook_addr
= SYMBOL_VALUE_ADDRESS (msym
);
2641 hp_cxx_exception_support
= 1;
2645 warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook
);
2646 warning ("Executable may not have been compiled debuggable with HP aCC.");
2647 warning ("GDB will be unable to intercept exception events.");
2648 eh_notify_hook_addr
= 0;
2649 hp_cxx_exception_support
= 0;
2653 /* Next look for the notify callback routine in end.o */
2654 /* This is always available in the SOM symbol dictionary if end.o is linked in */
2655 msym
= lookup_minimal_symbol (HP_ACC_EH_notify_callback
, NULL
, NULL
);
2658 eh_notify_callback_addr
= SYMBOL_VALUE_ADDRESS (msym
);
2659 hp_cxx_exception_support
= 1;
2663 warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback
);
2664 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
2665 warning ("GDB will be unable to intercept exception events.");
2666 eh_notify_callback_addr
= 0;
2670 #ifndef GDB_TARGET_IS_HPPA_20W
2671 /* Check whether the executable is dynamically linked or archive bound */
2672 /* With an archive-bound executable we can use the raw addresses we find
2673 for the callback function, etc. without modification. For an executable
2674 with shared libraries, we have to do more work to find the plabel, which
2675 can be the target of a call through $$dyncall from the aCC runtime support
2676 library (libCsup) which is linked shared by default by aCC. */
2677 /* This test below was copied from somsolib.c/somread.c. It may not be a very
2678 reliable one to test that an executable is linked shared. pai/1997-07-18 */
2679 shlib_info
= bfd_get_section_by_name (symfile_objfile
->obfd
, "$SHLIB_INFO$");
2680 if (shlib_info
&& (bfd_section_size (symfile_objfile
->obfd
, shlib_info
) != 0))
2682 /* The minsym we have has the local code address, but that's not the
2683 plabel that can be used by an inter-load-module call. */
2684 /* Find solib handle for main image (which has end.o), and use that
2685 and the min sym as arguments to __d_shl_get() (which does the equivalent
2686 of shl_findsym()) to find the plabel. */
2688 args_for_find_stub args
;
2689 static char message
[] = "Error while finding exception callback hook:\n";
2691 args
.solib_handle
= som_solib_get_solib_by_pc (eh_notify_callback_addr
);
2693 args
.return_val
= 0;
2696 catch_errors (cover_find_stub_with_shl_get
, &args
, message
,
2698 eh_notify_callback_addr
= args
.return_val
;
2701 exception_catchpoints_are_fragile
= 1;
2703 if (!eh_notify_callback_addr
)
2705 /* We can get here either if there is no plabel in the export list
2706 for the main image, or if something strange happened (?) */
2707 warning ("Couldn't find a plabel (indirect function label) for the exception callback.");
2708 warning ("GDB will not be able to intercept exception events.");
2713 exception_catchpoints_are_fragile
= 0;
2716 /* Now, look for the breakpointable routine in end.o */
2717 /* This should also be available in the SOM symbol dict. if end.o linked in */
2718 msym
= lookup_minimal_symbol (HP_ACC_EH_break
, NULL
, NULL
);
2721 eh_break_addr
= SYMBOL_VALUE_ADDRESS (msym
);
2722 hp_cxx_exception_support
= 1;
2726 warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break
);
2727 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
2728 warning ("GDB will be unable to intercept exception events.");
2733 /* Next look for the catch enable flag provided in end.o */
2734 sym
= lookup_symbol (HP_ACC_EH_catch_catch
, (struct block
*) NULL
,
2735 VAR_DOMAIN
, 0, (struct symtab
**) NULL
);
2736 if (sym
) /* sometimes present in debug info */
2738 eh_catch_catch_addr
= SYMBOL_VALUE_ADDRESS (sym
);
2739 hp_cxx_exception_support
= 1;
2742 /* otherwise look in SOM symbol dict. */
2744 msym
= lookup_minimal_symbol (HP_ACC_EH_catch_catch
, NULL
, NULL
);
2747 eh_catch_catch_addr
= SYMBOL_VALUE_ADDRESS (msym
);
2748 hp_cxx_exception_support
= 1;
2752 warning ("Unable to enable interception of exception catches.");
2753 warning ("Executable may not have been compiled debuggable with HP aCC.");
2754 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
2759 /* Next look for the catch enable flag provided end.o */
2760 sym
= lookup_symbol (HP_ACC_EH_catch_catch
, (struct block
*) NULL
,
2761 VAR_DOMAIN
, 0, (struct symtab
**) NULL
);
2762 if (sym
) /* sometimes present in debug info */
2764 eh_catch_throw_addr
= SYMBOL_VALUE_ADDRESS (sym
);
2765 hp_cxx_exception_support
= 1;
2768 /* otherwise look in SOM symbol dict. */
2770 msym
= lookup_minimal_symbol (HP_ACC_EH_catch_throw
, NULL
, NULL
);
2773 eh_catch_throw_addr
= SYMBOL_VALUE_ADDRESS (msym
);
2774 hp_cxx_exception_support
= 1;
2778 warning ("Unable to enable interception of exception throws.");
2779 warning ("Executable may not have been compiled debuggable with HP aCC.");
2780 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
2786 hp_cxx_exception_support
= 2; /* everything worked so far */
2787 hp_cxx_exception_support_initialized
= 1;
2788 exception_support_initialized
= 1;
2793 /* Target operation for enabling or disabling interception of
2795 KIND is either EX_EVENT_THROW or EX_EVENT_CATCH
2796 ENABLE is either 0 (disable) or 1 (enable).
2797 Return value is NULL if no support found;
2798 -1 if something went wrong,
2799 or a pointer to a symtab/line struct if the breakpointable
2800 address was found. */
2802 struct symtab_and_line
*
2803 child_enable_exception_callback (enum exception_event_kind kind
, int enable
)
2807 if (!exception_support_initialized
|| !hp_cxx_exception_support_initialized
)
2808 if (!initialize_hp_cxx_exception_support ())
2811 switch (hp_cxx_exception_support
)
2814 /* Assuming no HP support at all */
2817 /* HP support should be present, but something went wrong */
2818 return (struct symtab_and_line
*) -1; /* yuck! */
2819 /* there may be other cases in the future */
2822 /* Set the EH hook to point to the callback routine */
2823 store_unsigned_integer (buf
, 4, enable
? eh_notify_callback_addr
: 0); /* FIXME 32x64 problem */
2824 /* pai: (temp) FIXME should there be a pack operation first? */
2825 if (target_write_memory (eh_notify_hook_addr
, buf
, 4)) /* FIXME 32x64 problem */
2827 warning ("Could not write to target memory for exception event callback.");
2828 warning ("Interception of exception events may not work.");
2829 return (struct symtab_and_line
*) -1;
2833 /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */
2834 if (PIDGET (inferior_ptid
) > 0)
2836 if (setup_d_pid_in_inferior ())
2837 return (struct symtab_and_line
*) -1;
2841 warning ("Internal error: Invalid inferior pid? Cannot intercept exception events.");
2842 return (struct symtab_and_line
*) -1;
2848 case EX_EVENT_THROW
:
2849 store_unsigned_integer (buf
, 4, enable
? 1 : 0);
2850 if (target_write_memory (eh_catch_throw_addr
, buf
, 4)) /* FIXME 32x64? */
2852 warning ("Couldn't enable exception throw interception.");
2853 return (struct symtab_and_line
*) -1;
2856 case EX_EVENT_CATCH
:
2857 store_unsigned_integer (buf
, 4, enable
? 1 : 0);
2858 if (target_write_memory (eh_catch_catch_addr
, buf
, 4)) /* FIXME 32x64? */
2860 warning ("Couldn't enable exception catch interception.");
2861 return (struct symtab_and_line
*) -1;
2865 error ("Request to enable unknown or unsupported exception event.");
2868 /* Copy break address into new sal struct, malloc'ing if needed. */
2869 if (!break_callback_sal
)
2871 break_callback_sal
= (struct symtab_and_line
*) xmalloc (sizeof (struct symtab_and_line
));
2873 init_sal (break_callback_sal
);
2874 break_callback_sal
->symtab
= NULL
;
2875 break_callback_sal
->pc
= eh_break_addr
;
2876 break_callback_sal
->line
= 0;
2877 break_callback_sal
->end
= eh_break_addr
;
2879 return break_callback_sal
;
2882 /* Record some information about the current exception event */
2883 static struct exception_event_record current_ex_event
;
2884 /* Convenience struct */
2885 static struct symtab_and_line null_symtab_and_line
=
2888 /* Report current exception event. Returns a pointer to a record
2889 that describes the kind of the event, where it was thrown from,
2890 and where it will be caught. More information may be reported
2892 struct exception_event_record
*
2893 child_get_current_exception_event (void)
2895 CORE_ADDR event_kind
;
2896 CORE_ADDR throw_addr
;
2897 CORE_ADDR catch_addr
;
2898 struct frame_info
*fi
, *curr_frame
;
2901 curr_frame
= get_current_frame ();
2903 return (struct exception_event_record
*) NULL
;
2905 /* Go up one frame to __d_eh_notify_callback, because at the
2906 point when this code is executed, there's garbage in the
2907 arguments of __d_eh_break. */
2908 fi
= find_relative_frame (curr_frame
, &level
);
2910 return (struct exception_event_record
*) NULL
;
2914 /* Read in the arguments */
2915 /* __d_eh_notify_callback() is called with 3 arguments:
2916 1. event kind catch or throw
2917 2. the target address if known
2918 3. a flag -- not sure what this is. pai/1997-07-17 */
2919 event_kind
= read_register (ARG0_REGNUM
);
2920 catch_addr
= read_register (ARG1_REGNUM
);
2922 /* Now go down to a user frame */
2923 /* For a throw, __d_eh_break is called by
2924 __d_eh_notify_callback which is called by
2925 __notify_throw which is called
2927 For a catch, __d_eh_break is called by
2928 __d_eh_notify_callback which is called by
2929 <stackwalking stuff> which is called by
2930 __throw__<stuff> or __rethrow_<stuff> which is called
2932 /* FIXME: Don't use such magic numbers; search for the frames */
2933 level
= (event_kind
== EX_EVENT_THROW
) ? 3 : 4;
2934 fi
= find_relative_frame (curr_frame
, &level
);
2936 return (struct exception_event_record
*) NULL
;
2939 throw_addr
= get_frame_pc (fi
);
2941 /* Go back to original (top) frame */
2942 select_frame (curr_frame
);
2944 current_ex_event
.kind
= (enum exception_event_kind
) event_kind
;
2945 current_ex_event
.throw_sal
= find_pc_line (throw_addr
, 1);
2946 current_ex_event
.catch_sal
= find_pc_line (catch_addr
, 1);
2948 return ¤t_ex_event
;
2951 /* Instead of this nasty cast, add a method pvoid() that prints out a
2952 host VOID data type (remember %p isn't portable). */
2955 hppa_pointer_to_address_hack (void *ptr
)
2957 gdb_assert (sizeof (ptr
) == TYPE_LENGTH (builtin_type_void_data_ptr
));
2958 return POINTER_TO_ADDRESS (builtin_type_void_data_ptr
, &ptr
);
2962 unwind_command (char *exp
, int from_tty
)
2965 struct unwind_table_entry
*u
;
2967 /* If we have an expression, evaluate it and use it as the address. */
2969 if (exp
!= 0 && *exp
!= 0)
2970 address
= parse_and_eval_address (exp
);
2974 u
= find_unwind_entry (address
);
2978 printf_unfiltered ("Can't find unwind table entry for %s\n", exp
);
2982 printf_unfiltered ("unwind_table_entry (0x%s):\n",
2983 paddr_nz (hppa_pointer_to_address_hack (u
)));
2985 printf_unfiltered ("\tregion_start = ");
2986 print_address (u
->region_start
, gdb_stdout
);
2988 printf_unfiltered ("\n\tregion_end = ");
2989 print_address (u
->region_end
, gdb_stdout
);
2991 #define pif(FLD) if (u->FLD) printf_unfiltered (" "#FLD);
2993 printf_unfiltered ("\n\tflags =");
2994 pif (Cannot_unwind
);
2996 pif (Millicode_save_sr0
);
2999 pif (Variable_Frame
);
3000 pif (Separate_Package_Body
);
3001 pif (Frame_Extension_Millicode
);
3002 pif (Stack_Overflow_Check
);
3003 pif (Two_Instruction_SP_Increment
);
3007 pif (Save_MRP_in_frame
);
3008 pif (extn_ptr_defined
);
3009 pif (Cleanup_defined
);
3010 pif (MPE_XL_interrupt_marker
);
3011 pif (HP_UX_interrupt_marker
);
3014 putchar_unfiltered ('\n');
3016 #define pin(FLD) printf_unfiltered ("\t"#FLD" = 0x%x\n", u->FLD);
3018 pin (Region_description
);
3021 pin (Total_frame_size
);
3025 hppa_skip_permanent_breakpoint (void)
3027 /* To step over a breakpoint instruction on the PA takes some
3028 fiddling with the instruction address queue.
3030 When we stop at a breakpoint, the IA queue front (the instruction
3031 we're executing now) points at the breakpoint instruction, and
3032 the IA queue back (the next instruction to execute) points to
3033 whatever instruction we would execute after the breakpoint, if it
3034 were an ordinary instruction. This is the case even if the
3035 breakpoint is in the delay slot of a branch instruction.
3037 Clearly, to step past the breakpoint, we need to set the queue
3038 front to the back. But what do we put in the back? What
3039 instruction comes after that one? Because of the branch delay
3040 slot, the next insn is always at the back + 4. */
3041 write_register (PCOQ_HEAD_REGNUM
, read_register (PCOQ_TAIL_REGNUM
));
3042 write_register (PCSQ_HEAD_REGNUM
, read_register (PCSQ_TAIL_REGNUM
));
3044 write_register (PCOQ_TAIL_REGNUM
, read_register (PCOQ_TAIL_REGNUM
) + 4);
3045 /* We can leave the tail's space the same, since there's no jump. */
3049 hppa_reg_struct_has_addr (int gcc_p
, struct type
*type
)
3051 /* On the PA, any pass-by-value structure > 8 bytes is actually passed
3052 via a pointer regardless of its type or the compiler used. */
3053 return (TYPE_LENGTH (type
) > 8);
3057 hppa_inner_than (CORE_ADDR lhs
, CORE_ADDR rhs
)
3059 /* Stack grows upward */
3064 hppa_pc_requires_run_before_use (CORE_ADDR pc
)
3066 /* Sometimes we may pluck out a minimal symbol that has a negative address.
3068 An example of this occurs when an a.out is linked against a foo.sl.
3069 The foo.sl defines a global bar(), and the a.out declares a signature
3070 for bar(). However, the a.out doesn't directly call bar(), but passes
3071 its address in another call.
3073 If you have this scenario and attempt to "break bar" before running,
3074 gdb will find a minimal symbol for bar() in the a.out. But that
3075 symbol's address will be negative. What this appears to denote is
3076 an index backwards from the base of the procedure linkage table (PLT)
3077 into the data linkage table (DLT), the end of which is contiguous
3078 with the start of the PLT. This is clearly not a valid address for
3079 us to set a breakpoint on.
3081 Note that one must be careful in how one checks for a negative address.
3082 0xc0000000 is a legitimate address of something in a shared text
3083 segment, for example. Since I don't know what the possible range
3084 is of these "really, truly negative" addresses that come from the
3085 minimal symbols, I'm resorting to the gross hack of checking the
3086 top byte of the address for all 1's. Sigh. */
3088 return (!target_has_stack
&& (pc
& 0xFF000000));
3092 hppa_instruction_nullified (void)
3094 /* brobecker 2002/11/07: Couldn't we use a ULONGEST here? It would
3095 avoid the type cast. I'm leaving it as is for now as I'm doing
3096 semi-mechanical multiarching-related changes. */
3097 const int ipsw
= (int) read_register (IPSW_REGNUM
);
3098 const int flags
= (int) read_register (FLAGS_REGNUM
);
3100 return ((ipsw
& 0x00200000) && !(flags
& 0x2));
3103 /* Return the GDB type object for the "standard" data type of data
3106 static struct type
*
3107 hppa32_register_type (struct gdbarch
*gdbarch
, int reg_nr
)
3109 if (reg_nr
< FP4_REGNUM
)
3110 return builtin_type_uint32
;
3112 return builtin_type_ieee_single_big
;
3115 /* Return the GDB type object for the "standard" data type of data
3116 in register N. hppa64 version. */
3118 static struct type
*
3119 hppa64_register_type (struct gdbarch
*gdbarch
, int reg_nr
)
3121 if (reg_nr
< FP4_REGNUM
)
3122 return builtin_type_uint64
;
3124 return builtin_type_ieee_double_big
;
3127 /* Return True if REGNUM is not a register available to the user
3128 through ptrace(). */
3131 hppa_cannot_store_register (int regnum
)
3134 || regnum
== PCSQ_HEAD_REGNUM
3135 || (regnum
>= PCSQ_TAIL_REGNUM
&& regnum
< IPSW_REGNUM
)
3136 || (regnum
> IPSW_REGNUM
&& regnum
< FP4_REGNUM
));
3141 hppa_smash_text_address (CORE_ADDR addr
)
3143 /* The low two bits of the PC on the PA contain the privilege level.
3144 Some genius implementing a (non-GCC) compiler apparently decided
3145 this means that "addresses" in a text section therefore include a
3146 privilege level, and thus symbol tables should contain these bits.
3147 This seems like a bonehead thing to do--anyway, it seems to work
3148 for our purposes to just ignore those bits. */
3150 return (addr
&= ~0x3);
3153 /* Get the ith function argument for the current function. */
3155 hppa_fetch_pointer_argument (struct frame_info
*frame
, int argi
,
3159 get_frame_register (frame
, R0_REGNUM
+ 26 - argi
, &addr
);
3163 /* Here is a table of C type sizes on hppa with various compiles
3164 and options. I measured this on PA 9000/800 with HP-UX 11.11
3165 and these compilers:
3167 /usr/ccs/bin/cc HP92453-01 A.11.01.21
3168 /opt/ansic/bin/cc HP92453-01 B.11.11.28706.GP
3169 /opt/aCC/bin/aCC B3910B A.03.45
3170 gcc gcc 3.3.2 native hppa2.0w-hp-hpux11.11
3172 cc : 1 2 4 4 8 : 4 8 -- : 4 4
3173 ansic +DA1.1 : 1 2 4 4 8 : 4 8 16 : 4 4
3174 ansic +DA2.0 : 1 2 4 4 8 : 4 8 16 : 4 4
3175 ansic +DA2.0W : 1 2 4 8 8 : 4 8 16 : 8 8
3176 acc +DA1.1 : 1 2 4 4 8 : 4 8 16 : 4 4
3177 acc +DA2.0 : 1 2 4 4 8 : 4 8 16 : 4 4
3178 acc +DA2.0W : 1 2 4 8 8 : 4 8 16 : 8 8
3179 gcc : 1 2 4 4 8 : 4 8 16 : 4 4
3183 compiler and options
3184 char, short, int, long, long long
3185 float, double, long double
3188 So all these compilers use either ILP32 or LP64 model.
3189 TODO: gcc has more options so it needs more investigation.
3191 For floating point types, see:
3193 http://docs.hp.com/hpux/pdf/B3906-90006.pdf
3194 HP-UX floating-point guide, hpux 11.00
3196 -- chastain 2003-12-18 */
3198 static struct gdbarch
*
3199 hppa_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
3201 struct gdbarch_tdep
*tdep
;
3202 struct gdbarch
*gdbarch
;
3204 /* Try to determine the ABI of the object we are loading. */
3205 if (info
.abfd
!= NULL
&& info
.osabi
== GDB_OSABI_UNKNOWN
)
3207 /* If it's a SOM file, assume it's HP/UX SOM. */
3208 if (bfd_get_flavour (info
.abfd
) == bfd_target_som_flavour
)
3209 info
.osabi
= GDB_OSABI_HPUX_SOM
;
3212 /* find a candidate among the list of pre-declared architectures. */
3213 arches
= gdbarch_list_lookup_by_info (arches
, &info
);
3215 return (arches
->gdbarch
);
3217 /* If none found, then allocate and initialize one. */
3218 tdep
= XMALLOC (struct gdbarch_tdep
);
3219 gdbarch
= gdbarch_alloc (&info
, tdep
);
3221 /* Determine from the bfd_arch_info structure if we are dealing with
3222 a 32 or 64 bits architecture. If the bfd_arch_info is not available,
3223 then default to a 32bit machine. */
3224 if (info
.bfd_arch_info
!= NULL
)
3225 tdep
->bytes_per_address
=
3226 info
.bfd_arch_info
->bits_per_address
/ info
.bfd_arch_info
->bits_per_byte
;
3228 tdep
->bytes_per_address
= 4;
3230 /* Some parts of the gdbarch vector depend on whether we are running
3231 on a 32 bits or 64 bits target. */
3232 switch (tdep
->bytes_per_address
)
3235 set_gdbarch_num_regs (gdbarch
, hppa32_num_regs
);
3236 set_gdbarch_register_name (gdbarch
, hppa32_register_name
);
3237 set_gdbarch_register_type (gdbarch
, hppa32_register_type
);
3240 set_gdbarch_num_regs (gdbarch
, hppa64_num_regs
);
3241 set_gdbarch_register_name (gdbarch
, hppa64_register_name
);
3242 set_gdbarch_register_type (gdbarch
, hppa64_register_type
);
3245 internal_error (__FILE__
, __LINE__
, "Unsupported address size: %d",
3246 tdep
->bytes_per_address
);
3249 set_gdbarch_long_bit (gdbarch
, tdep
->bytes_per_address
* TARGET_CHAR_BIT
);
3250 set_gdbarch_ptr_bit (gdbarch
, tdep
->bytes_per_address
* TARGET_CHAR_BIT
);
3252 /* The following gdbarch vector elements are the same in both ILP32
3253 and LP64, but might show differences some day. */
3254 set_gdbarch_long_long_bit (gdbarch
, 64);
3255 set_gdbarch_long_double_bit (gdbarch
, 128);
3256 set_gdbarch_long_double_format (gdbarch
, &floatformat_ia64_quad_big
);
3258 /* The following gdbarch vector elements do not depend on the address
3259 size, or in any other gdbarch element previously set. */
3260 set_gdbarch_skip_prologue (gdbarch
, hppa_skip_prologue
);
3261 set_gdbarch_skip_trampoline_code (gdbarch
, hppa_skip_trampoline_code
);
3262 set_gdbarch_in_solib_call_trampoline (gdbarch
, hppa_in_solib_call_trampoline
);
3263 set_gdbarch_in_solib_return_trampoline (gdbarch
,
3264 hppa_in_solib_return_trampoline
);
3265 set_gdbarch_inner_than (gdbarch
, hppa_inner_than
);
3266 set_gdbarch_sp_regnum (gdbarch
, HPPA_SP_REGNUM
);
3267 set_gdbarch_fp0_regnum (gdbarch
, HPPA_FP0_REGNUM
);
3268 set_gdbarch_cannot_store_register (gdbarch
, hppa_cannot_store_register
);
3269 set_gdbarch_addr_bits_remove (gdbarch
, hppa_smash_text_address
);
3270 set_gdbarch_smash_text_address (gdbarch
, hppa_smash_text_address
);
3271 set_gdbarch_believe_pcc_promotion (gdbarch
, 1);
3272 set_gdbarch_read_pc (gdbarch
, hppa_target_read_pc
);
3273 set_gdbarch_write_pc (gdbarch
, hppa_target_write_pc
);
3275 /* Helper for function argument information. */
3276 set_gdbarch_fetch_pointer_argument (gdbarch
, hppa_fetch_pointer_argument
);
3278 set_gdbarch_print_insn (gdbarch
, print_insn_hppa
);
3280 /* When a hardware watchpoint triggers, we'll move the inferior past
3281 it by removing all eventpoints; stepping past the instruction
3282 that caused the trigger; reinserting eventpoints; and checking
3283 whether any watched location changed. */
3284 set_gdbarch_have_nonsteppable_watchpoint (gdbarch
, 1);
3286 /* Inferior function call methods. */
3287 switch (tdep
->bytes_per_address
)
3290 set_gdbarch_push_dummy_call (gdbarch
, hppa32_push_dummy_call
);
3291 set_gdbarch_frame_align (gdbarch
, hppa32_frame_align
);
3294 set_gdbarch_push_dummy_call (gdbarch
, hppa64_push_dummy_call
);
3295 set_gdbarch_frame_align (gdbarch
, hppa64_frame_align
);
3298 internal_error (__FILE__
, __LINE__
, "bad switch");
3301 /* Struct return methods. */
3302 switch (tdep
->bytes_per_address
)
3305 set_gdbarch_return_value (gdbarch
, hppa32_return_value
);
3308 set_gdbarch_return_value (gdbarch
, hppa64_return_value
);
3311 internal_error (__FILE__
, __LINE__
, "bad switch");
3314 /* Frame unwind methods. */
3315 set_gdbarch_unwind_dummy_id (gdbarch
, hppa_unwind_dummy_id
);
3316 set_gdbarch_unwind_pc (gdbarch
, hppa_unwind_pc
);
3317 frame_unwind_append_sniffer (gdbarch
, hppa_frame_unwind_sniffer
);
3318 frame_base_append_sniffer (gdbarch
, hppa_frame_base_sniffer
);
3320 /* Hook in ABI-specific overrides, if they have been registered. */
3321 gdbarch_init_osabi (info
, gdbarch
);
3327 hppa_dump_tdep (struct gdbarch
*current_gdbarch
, struct ui_file
*file
)
3329 /* Nothing to print for the moment. */
3333 _initialize_hppa_tdep (void)
3335 struct cmd_list_element
*c
;
3336 void break_at_finish_command (char *arg
, int from_tty
);
3337 void tbreak_at_finish_command (char *arg
, int from_tty
);
3338 void break_at_finish_at_depth_command (char *arg
, int from_tty
);
3340 gdbarch_register (bfd_arch_hppa
, hppa_gdbarch_init
, hppa_dump_tdep
);
3342 add_cmd ("unwind", class_maintenance
, unwind_command
,
3343 "Print unwind table entry at given address.",
3344 &maintenanceprintlist
);
3346 deprecate_cmd (add_com ("xbreak", class_breakpoint
,
3347 break_at_finish_command
,
3348 concat ("Set breakpoint at procedure exit. \n\
3349 Argument may be function name, or \"*\" and an address.\n\
3350 If function is specified, break at end of code for that function.\n\
3351 If an address is specified, break at the end of the function that contains \n\
3352 that exact address.\n",
3353 "With no arg, uses current execution address of selected stack frame.\n\
3354 This is useful for breaking on return to a stack frame.\n\
3356 Multiple breakpoints at one place are permitted, and useful if conditional.\n\
3358 Do \"help breakpoints\" for info on other commands dealing with breakpoints.", NULL
)), NULL
);
3359 deprecate_cmd (add_com_alias ("xb", "xbreak", class_breakpoint
, 1), NULL
);
3360 deprecate_cmd (add_com_alias ("xbr", "xbreak", class_breakpoint
, 1), NULL
);
3361 deprecate_cmd (add_com_alias ("xbre", "xbreak", class_breakpoint
, 1), NULL
);
3362 deprecate_cmd (add_com_alias ("xbrea", "xbreak", class_breakpoint
, 1), NULL
);
3364 deprecate_cmd (c
= add_com ("txbreak", class_breakpoint
,
3365 tbreak_at_finish_command
,
3366 "Set temporary breakpoint at procedure exit. Either there should\n\
3367 be no argument or the argument must be a depth.\n"), NULL
);
3368 set_cmd_completer (c
, location_completer
);
3371 deprecate_cmd (add_com ("bx", class_breakpoint
,
3372 break_at_finish_at_depth_command
,
3373 "Set breakpoint at procedure exit. Either there should\n\
3374 be no argument or the argument must be a depth.\n"), NULL
);