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),
902 REG_PARM_STACK_SPACE
);
906 /* If a structure has to be returned, set up register 28 to hold its
909 write_register (28, struct_addr
);
911 /* Set the return address. */
912 regcache_cooked_write_unsigned (regcache
, RP_REGNUM
, bp_addr
);
914 /* The stack will have 32 bytes of additional space for a frame marker. */
915 return param_end
+ 32;
918 /* This function pushes a stack frame with arguments as part of the
919 inferior function calling mechanism.
921 This is the version for the PA64, in which later arguments appear
922 at higher addresses. (The stack always grows towards higher
925 We simply allocate the appropriate amount of stack space and put
926 arguments into their proper slots.
928 This ABI also requires that the caller provide an argument pointer
929 to the callee, so we do that too. */
932 hppa64_push_dummy_call (struct gdbarch
*gdbarch
, CORE_ADDR func_addr
,
933 struct regcache
*regcache
, CORE_ADDR bp_addr
,
934 int nargs
, struct value
**args
, CORE_ADDR sp
,
935 int struct_return
, CORE_ADDR struct_addr
)
937 /* NOTE: cagney/2004-02-27: This is a guess - its implemented by
938 reverse engineering testsuite failures. */
940 /* Stack base address at which any pass-by-reference parameters are
942 CORE_ADDR struct_end
= 0;
943 /* Stack base address at which the first parameter is stored. */
944 CORE_ADDR param_end
= 0;
946 /* The inner most end of the stack after all the parameters have
948 CORE_ADDR new_sp
= 0;
950 /* Two passes. First pass computes the location of everything,
951 second pass writes the bytes out. */
953 for (write_pass
= 0; write_pass
< 2; write_pass
++)
955 CORE_ADDR struct_ptr
= 0;
956 CORE_ADDR param_ptr
= 0;
958 for (i
= 0; i
< nargs
; i
++)
960 struct value
*arg
= args
[i
];
961 struct type
*type
= check_typedef (VALUE_TYPE (arg
));
962 if ((TYPE_CODE (type
) == TYPE_CODE_INT
963 || TYPE_CODE (type
) == TYPE_CODE_ENUM
)
964 && TYPE_LENGTH (type
) <= 8)
966 /* Integer value store, right aligned. "unpack_long"
967 takes care of any sign-extension problems. */
971 ULONGEST val
= unpack_long (type
, VALUE_CONTENTS (arg
));
972 int reg
= 27 - param_ptr
/ 8;
973 write_memory_unsigned_integer (param_end
- param_ptr
,
976 regcache_cooked_write_unsigned (regcache
, reg
, val
);
981 /* Small struct value, store left aligned? */
983 if (TYPE_LENGTH (type
) > 8)
985 param_ptr
= align_up (param_ptr
, 16);
986 reg
= 26 - param_ptr
/ 8;
987 param_ptr
+= align_up (TYPE_LENGTH (type
), 16);
991 param_ptr
= align_up (param_ptr
, 8);
992 reg
= 26 - param_ptr
/ 8;
993 param_ptr
+= align_up (TYPE_LENGTH (type
), 8);
998 write_memory (param_end
- param_ptr
, VALUE_CONTENTS (arg
),
1000 for (byte
= 0; byte
< TYPE_LENGTH (type
); byte
+= 8)
1004 int len
= min (8, TYPE_LENGTH (type
) - byte
);
1005 regcache_cooked_write_part (regcache
, reg
, 0, len
,
1006 VALUE_CONTENTS (arg
) + byte
);
1013 /* Update the various stack pointers. */
1016 struct_end
= sp
+ struct_ptr
;
1017 /* PARAM_PTR already accounts for all the arguments passed
1018 by the user. However, the ABI mandates minimum stack
1019 space allocations for outgoing arguments. The ABI also
1020 mandates minimum stack alignments which we must
1022 param_end
= struct_end
+ max (align_up (param_ptr
, 16),
1023 REG_PARM_STACK_SPACE
);
1027 /* If a structure has to be returned, set up register 28 to hold its
1030 write_register (28, struct_addr
);
1032 /* Set the return address. */
1033 regcache_cooked_write_unsigned (regcache
, RP_REGNUM
, bp_addr
);
1035 /* The stack will have 32 bytes of additional space for a frame marker. */
1036 return param_end
+ 64;
1040 hppa32_frame_align (struct gdbarch
*gdbarch
, CORE_ADDR addr
)
1042 /* HP frames are 64-byte (or cache line) aligned (yes that's _byte_
1044 return align_up (addr
, 64);
1047 /* Force all frames to 16-byte alignment. Better safe than sorry. */
1050 hppa64_frame_align (struct gdbarch
*gdbarch
, CORE_ADDR addr
)
1052 /* Just always 16-byte align. */
1053 return align_up (addr
, 16);
1057 /* elz: Used to lookup a symbol in the shared libraries.
1058 This function calls shl_findsym, indirectly through a
1059 call to __d_shl_get. __d_shl_get is in end.c, which is always
1060 linked in by the hp compilers/linkers.
1061 The call to shl_findsym cannot be made directly because it needs
1062 to be active in target address space.
1063 inputs: - minimal symbol pointer for the function we want to look up
1064 - address in target space of the descriptor for the library
1065 where we want to look the symbol up.
1066 This address is retrieved using the
1067 som_solib_get_solib_by_pc function (somsolib.c).
1068 output: - real address in the library of the function.
1069 note: the handle can be null, in which case shl_findsym will look for
1070 the symbol in all the loaded shared libraries.
1071 files to look at if you need reference on this stuff:
1072 dld.c, dld_shl_findsym.c
1074 man entry for shl_findsym */
1077 find_stub_with_shl_get (struct minimal_symbol
*function
, CORE_ADDR handle
)
1079 struct symbol
*get_sym
, *symbol2
;
1080 struct minimal_symbol
*buff_minsym
, *msymbol
;
1082 struct value
**args
;
1083 struct value
*funcval
;
1086 int x
, namelen
, err_value
, tmp
= -1;
1087 CORE_ADDR endo_buff_addr
, value_return_addr
, errno_return_addr
;
1088 CORE_ADDR stub_addr
;
1091 args
= alloca (sizeof (struct value
*) * 8); /* 6 for the arguments and one null one??? */
1092 funcval
= find_function_in_inferior ("__d_shl_get");
1093 get_sym
= lookup_symbol ("__d_shl_get", NULL
, VAR_DOMAIN
, NULL
, NULL
);
1094 buff_minsym
= lookup_minimal_symbol ("__buffer", NULL
, NULL
);
1095 msymbol
= lookup_minimal_symbol ("__shldp", NULL
, NULL
);
1096 symbol2
= lookup_symbol ("__shldp", NULL
, VAR_DOMAIN
, NULL
, NULL
);
1097 endo_buff_addr
= SYMBOL_VALUE_ADDRESS (buff_minsym
);
1098 namelen
= strlen (DEPRECATED_SYMBOL_NAME (function
));
1099 value_return_addr
= endo_buff_addr
+ namelen
;
1100 ftype
= check_typedef (SYMBOL_TYPE (get_sym
));
1103 if ((x
= value_return_addr
% 64) != 0)
1104 value_return_addr
= value_return_addr
+ 64 - x
;
1106 errno_return_addr
= value_return_addr
+ 64;
1109 /* set up stuff needed by __d_shl_get in buffer in end.o */
1111 target_write_memory (endo_buff_addr
, DEPRECATED_SYMBOL_NAME (function
), namelen
);
1113 target_write_memory (value_return_addr
, (char *) &tmp
, 4);
1115 target_write_memory (errno_return_addr
, (char *) &tmp
, 4);
1117 target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol
),
1118 (char *) &handle
, 4);
1120 /* now prepare the arguments for the call */
1122 args
[0] = value_from_longest (TYPE_FIELD_TYPE (ftype
, 0), 12);
1123 args
[1] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 1), SYMBOL_VALUE_ADDRESS (msymbol
));
1124 args
[2] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 2), endo_buff_addr
);
1125 args
[3] = value_from_longest (TYPE_FIELD_TYPE (ftype
, 3), TYPE_PROCEDURE
);
1126 args
[4] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 4), value_return_addr
);
1127 args
[5] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 5), errno_return_addr
);
1129 /* now call the function */
1131 val
= call_function_by_hand (funcval
, 6, args
);
1133 /* now get the results */
1135 target_read_memory (errno_return_addr
, (char *) &err_value
, sizeof (err_value
));
1137 target_read_memory (value_return_addr
, (char *) &stub_addr
, sizeof (stub_addr
));
1139 error ("call to __d_shl_get failed, error code is %d", err_value
);
1144 /* Cover routine for find_stub_with_shl_get to pass to catch_errors */
1146 cover_find_stub_with_shl_get (void *args_untyped
)
1148 args_for_find_stub
*args
= args_untyped
;
1149 args
->return_val
= find_stub_with_shl_get (args
->msym
, args
->solib_handle
);
1153 /* Get the PC from %r31 if currently in a syscall. Also mask out privilege
1157 hppa_target_read_pc (ptid_t ptid
)
1159 int flags
= read_register_pid (FLAGS_REGNUM
, ptid
);
1161 /* The following test does not belong here. It is OS-specific, and belongs
1163 /* Test SS_INSYSCALL */
1165 return read_register_pid (31, ptid
) & ~0x3;
1167 return read_register_pid (PCOQ_HEAD_REGNUM
, ptid
) & ~0x3;
1170 /* Write out the PC. If currently in a syscall, then also write the new
1171 PC value into %r31. */
1174 hppa_target_write_pc (CORE_ADDR v
, ptid_t ptid
)
1176 int flags
= read_register_pid (FLAGS_REGNUM
, ptid
);
1178 /* The following test does not belong here. It is OS-specific, and belongs
1180 /* If in a syscall, then set %r31. Also make sure to get the
1181 privilege bits set correctly. */
1182 /* Test SS_INSYSCALL */
1184 write_register_pid (31, v
| 0x3, ptid
);
1186 write_register_pid (PCOQ_HEAD_REGNUM
, v
, ptid
);
1187 write_register_pid (PCOQ_TAIL_REGNUM
, v
+ 4, ptid
);
1190 /* return the alignment of a type in bytes. Structures have the maximum
1191 alignment required by their fields. */
1194 hppa_alignof (struct type
*type
)
1196 int max_align
, align
, i
;
1197 CHECK_TYPEDEF (type
);
1198 switch (TYPE_CODE (type
))
1203 return TYPE_LENGTH (type
);
1204 case TYPE_CODE_ARRAY
:
1205 return hppa_alignof (TYPE_FIELD_TYPE (type
, 0));
1206 case TYPE_CODE_STRUCT
:
1207 case TYPE_CODE_UNION
:
1209 for (i
= 0; i
< TYPE_NFIELDS (type
); i
++)
1211 /* Bit fields have no real alignment. */
1212 /* if (!TYPE_FIELD_BITPOS (type, i)) */
1213 if (!TYPE_FIELD_BITSIZE (type
, i
)) /* elz: this should be bitsize */
1215 align
= hppa_alignof (TYPE_FIELD_TYPE (type
, i
));
1216 max_align
= max (max_align
, align
);
1225 /* Return one if PC is in the call path of a trampoline, else return zero.
1227 Note we return one for *any* call trampoline (long-call, arg-reloc), not
1228 just shared library trampolines (import, export). */
1231 hppa_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
1233 struct minimal_symbol
*minsym
;
1234 struct unwind_table_entry
*u
;
1235 static CORE_ADDR dyncall
= 0;
1236 static CORE_ADDR sr4export
= 0;
1238 #ifdef GDB_TARGET_IS_HPPA_20W
1239 /* PA64 has a completely different stub/trampoline scheme. Is it
1240 better? Maybe. It's certainly harder to determine with any
1241 certainty that we are in a stub because we can not refer to the
1244 The heuristic is simple. Try to lookup the current PC value in th
1245 minimal symbol table. If that fails, then assume we are not in a
1248 Then see if the PC value falls within the section bounds for the
1249 section containing the minimal symbol we found in the first
1250 step. If it does, then assume we are not in a stub and return.
1252 Finally peek at the instructions to see if they look like a stub. */
1254 struct minimal_symbol
*minsym
;
1259 minsym
= lookup_minimal_symbol_by_pc (pc
);
1263 sec
= SYMBOL_BFD_SECTION (minsym
);
1265 if (bfd_get_section_vma (sec
->owner
, sec
) <= pc
1266 && pc
< (bfd_get_section_vma (sec
->owner
, sec
)
1267 + bfd_section_size (sec
->owner
, sec
)))
1270 /* We might be in a stub. Peek at the instructions. Stubs are 3
1271 instructions long. */
1272 insn
= read_memory_integer (pc
, 4);
1274 /* Find out where we think we are within the stub. */
1275 if ((insn
& 0xffffc00e) == 0x53610000)
1277 else if ((insn
& 0xffffffff) == 0xe820d000)
1279 else if ((insn
& 0xffffc00e) == 0x537b0000)
1284 /* Now verify each insn in the range looks like a stub instruction. */
1285 insn
= read_memory_integer (addr
, 4);
1286 if ((insn
& 0xffffc00e) != 0x53610000)
1289 /* Now verify each insn in the range looks like a stub instruction. */
1290 insn
= read_memory_integer (addr
+ 4, 4);
1291 if ((insn
& 0xffffffff) != 0xe820d000)
1294 /* Now verify each insn in the range looks like a stub instruction. */
1295 insn
= read_memory_integer (addr
+ 8, 4);
1296 if ((insn
& 0xffffc00e) != 0x537b0000)
1299 /* Looks like a stub. */
1304 /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a
1307 /* First see if PC is in one of the two C-library trampolines. */
1310 minsym
= lookup_minimal_symbol ("$$dyncall", NULL
, NULL
);
1312 dyncall
= SYMBOL_VALUE_ADDRESS (minsym
);
1319 minsym
= lookup_minimal_symbol ("_sr4export", NULL
, NULL
);
1321 sr4export
= SYMBOL_VALUE_ADDRESS (minsym
);
1326 if (pc
== dyncall
|| pc
== sr4export
)
1329 minsym
= lookup_minimal_symbol_by_pc (pc
);
1330 if (minsym
&& strcmp (DEPRECATED_SYMBOL_NAME (minsym
), ".stub") == 0)
1333 /* Get the unwind descriptor corresponding to PC, return zero
1334 if no unwind was found. */
1335 u
= find_unwind_entry (pc
);
1339 /* If this isn't a linker stub, then return now. */
1340 if (u
->stub_unwind
.stub_type
== 0)
1343 /* By definition a long-branch stub is a call stub. */
1344 if (u
->stub_unwind
.stub_type
== LONG_BRANCH
)
1347 /* The call and return path execute the same instructions within
1348 an IMPORT stub! So an IMPORT stub is both a call and return
1350 if (u
->stub_unwind
.stub_type
== IMPORT
)
1353 /* Parameter relocation stubs always have a call path and may have a
1355 if (u
->stub_unwind
.stub_type
== PARAMETER_RELOCATION
1356 || u
->stub_unwind
.stub_type
== EXPORT
)
1360 /* Search forward from the current PC until we hit a branch
1361 or the end of the stub. */
1362 for (addr
= pc
; addr
<= u
->region_end
; addr
+= 4)
1366 insn
= read_memory_integer (addr
, 4);
1368 /* Does it look like a bl? If so then it's the call path, if
1369 we find a bv or be first, then we're on the return path. */
1370 if ((insn
& 0xfc00e000) == 0xe8000000)
1372 else if ((insn
& 0xfc00e001) == 0xe800c000
1373 || (insn
& 0xfc000000) == 0xe0000000)
1377 /* Should never happen. */
1378 warning ("Unable to find branch in parameter relocation stub.\n");
1382 /* Unknown stub type. For now, just return zero. */
1386 /* Return one if PC is in the return path of a trampoline, else return zero.
1388 Note we return one for *any* call trampoline (long-call, arg-reloc), not
1389 just shared library trampolines (import, export). */
1392 hppa_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
1394 struct unwind_table_entry
*u
;
1396 /* Get the unwind descriptor corresponding to PC, return zero
1397 if no unwind was found. */
1398 u
= find_unwind_entry (pc
);
1402 /* If this isn't a linker stub or it's just a long branch stub, then
1404 if (u
->stub_unwind
.stub_type
== 0 || u
->stub_unwind
.stub_type
== LONG_BRANCH
)
1407 /* The call and return path execute the same instructions within
1408 an IMPORT stub! So an IMPORT stub is both a call and return
1410 if (u
->stub_unwind
.stub_type
== IMPORT
)
1413 /* Parameter relocation stubs always have a call path and may have a
1415 if (u
->stub_unwind
.stub_type
== PARAMETER_RELOCATION
1416 || u
->stub_unwind
.stub_type
== EXPORT
)
1420 /* Search forward from the current PC until we hit a branch
1421 or the end of the stub. */
1422 for (addr
= pc
; addr
<= u
->region_end
; addr
+= 4)
1426 insn
= read_memory_integer (addr
, 4);
1428 /* Does it look like a bl? If so then it's the call path, if
1429 we find a bv or be first, then we're on the return path. */
1430 if ((insn
& 0xfc00e000) == 0xe8000000)
1432 else if ((insn
& 0xfc00e001) == 0xe800c000
1433 || (insn
& 0xfc000000) == 0xe0000000)
1437 /* Should never happen. */
1438 warning ("Unable to find branch in parameter relocation stub.\n");
1442 /* Unknown stub type. For now, just return zero. */
1447 /* Figure out if PC is in a trampoline, and if so find out where
1448 the trampoline will jump to. If not in a trampoline, return zero.
1450 Simple code examination probably is not a good idea since the code
1451 sequences in trampolines can also appear in user code.
1453 We use unwinds and information from the minimal symbol table to
1454 determine when we're in a trampoline. This won't work for ELF
1455 (yet) since it doesn't create stub unwind entries. Whether or
1456 not ELF will create stub unwinds or normal unwinds for linker
1457 stubs is still being debated.
1459 This should handle simple calls through dyncall or sr4export,
1460 long calls, argument relocation stubs, and dyncall/sr4export
1461 calling an argument relocation stub. It even handles some stubs
1462 used in dynamic executables. */
1465 hppa_skip_trampoline_code (CORE_ADDR pc
)
1468 long prev_inst
, curr_inst
, loc
;
1469 static CORE_ADDR dyncall
= 0;
1470 static CORE_ADDR dyncall_external
= 0;
1471 static CORE_ADDR sr4export
= 0;
1472 struct minimal_symbol
*msym
;
1473 struct unwind_table_entry
*u
;
1475 /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a
1480 msym
= lookup_minimal_symbol ("$$dyncall", NULL
, NULL
);
1482 dyncall
= SYMBOL_VALUE_ADDRESS (msym
);
1487 if (!dyncall_external
)
1489 msym
= lookup_minimal_symbol ("$$dyncall_external", NULL
, NULL
);
1491 dyncall_external
= SYMBOL_VALUE_ADDRESS (msym
);
1493 dyncall_external
= -1;
1498 msym
= lookup_minimal_symbol ("_sr4export", NULL
, NULL
);
1500 sr4export
= SYMBOL_VALUE_ADDRESS (msym
);
1505 /* Addresses passed to dyncall may *NOT* be the actual address
1506 of the function. So we may have to do something special. */
1509 pc
= (CORE_ADDR
) read_register (22);
1511 /* If bit 30 (counting from the left) is on, then pc is the address of
1512 the PLT entry for this function, not the address of the function
1513 itself. Bit 31 has meaning too, but only for MPE. */
1515 pc
= (CORE_ADDR
) read_memory_integer (pc
& ~0x3, TARGET_PTR_BIT
/ 8);
1517 if (pc
== dyncall_external
)
1519 pc
= (CORE_ADDR
) read_register (22);
1520 pc
= (CORE_ADDR
) read_memory_integer (pc
& ~0x3, TARGET_PTR_BIT
/ 8);
1522 else if (pc
== sr4export
)
1523 pc
= (CORE_ADDR
) (read_register (22));
1525 /* Get the unwind descriptor corresponding to PC, return zero
1526 if no unwind was found. */
1527 u
= find_unwind_entry (pc
);
1531 /* If this isn't a linker stub, then return now. */
1532 /* elz: attention here! (FIXME) because of a compiler/linker
1533 error, some stubs which should have a non zero stub_unwind.stub_type
1534 have unfortunately a value of zero. So this function would return here
1535 as if we were not in a trampoline. To fix this, we go look at the partial
1536 symbol information, which reports this guy as a stub.
1537 (FIXME): Unfortunately, we are not that lucky: it turns out that the
1538 partial symbol information is also wrong sometimes. This is because
1539 when it is entered (somread.c::som_symtab_read()) it can happen that
1540 if the type of the symbol (from the som) is Entry, and the symbol is
1541 in a shared library, then it can also be a trampoline. This would
1542 be OK, except that I believe the way they decide if we are ina shared library
1543 does not work. SOOOO..., even if we have a regular function w/o trampolines
1544 its minimal symbol can be assigned type mst_solib_trampoline.
1545 Also, if we find that the symbol is a real stub, then we fix the unwind
1546 descriptor, and define the stub type to be EXPORT.
1547 Hopefully this is correct most of the times. */
1548 if (u
->stub_unwind
.stub_type
== 0)
1551 /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed
1552 we can delete all the code which appears between the lines */
1553 /*--------------------------------------------------------------------------*/
1554 msym
= lookup_minimal_symbol_by_pc (pc
);
1556 if (msym
== NULL
|| MSYMBOL_TYPE (msym
) != mst_solib_trampoline
)
1557 return orig_pc
== pc
? 0 : pc
& ~0x3;
1559 else if (msym
!= NULL
&& MSYMBOL_TYPE (msym
) == mst_solib_trampoline
)
1561 struct objfile
*objfile
;
1562 struct minimal_symbol
*msymbol
;
1563 int function_found
= 0;
1565 /* go look if there is another minimal symbol with the same name as
1566 this one, but with type mst_text. This would happen if the msym
1567 is an actual trampoline, in which case there would be another
1568 symbol with the same name corresponding to the real function */
1570 ALL_MSYMBOLS (objfile
, msymbol
)
1572 if (MSYMBOL_TYPE (msymbol
) == mst_text
1573 && DEPRECATED_STREQ (DEPRECATED_SYMBOL_NAME (msymbol
), DEPRECATED_SYMBOL_NAME (msym
)))
1581 /* the type of msym is correct (mst_solib_trampoline), but
1582 the unwind info is wrong, so set it to the correct value */
1583 u
->stub_unwind
.stub_type
= EXPORT
;
1585 /* the stub type info in the unwind is correct (this is not a
1586 trampoline), but the msym type information is wrong, it
1587 should be mst_text. So we need to fix the msym, and also
1588 get out of this function */
1590 MSYMBOL_TYPE (msym
) = mst_text
;
1591 return orig_pc
== pc
? 0 : pc
& ~0x3;
1595 /*--------------------------------------------------------------------------*/
1598 /* It's a stub. Search for a branch and figure out where it goes.
1599 Note we have to handle multi insn branch sequences like ldil;ble.
1600 Most (all?) other branches can be determined by examining the contents
1601 of certain registers and the stack. */
1608 /* Make sure we haven't walked outside the range of this stub. */
1609 if (u
!= find_unwind_entry (loc
))
1611 warning ("Unable to find branch in linker stub");
1612 return orig_pc
== pc
? 0 : pc
& ~0x3;
1615 prev_inst
= curr_inst
;
1616 curr_inst
= read_memory_integer (loc
, 4);
1618 /* Does it look like a branch external using %r1? Then it's the
1619 branch from the stub to the actual function. */
1620 if ((curr_inst
& 0xffe0e000) == 0xe0202000)
1622 /* Yup. See if the previous instruction loaded
1623 a value into %r1. If so compute and return the jump address. */
1624 if ((prev_inst
& 0xffe00000) == 0x20200000)
1625 return (extract_21 (prev_inst
) + extract_17 (curr_inst
)) & ~0x3;
1628 warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1).");
1629 return orig_pc
== pc
? 0 : pc
& ~0x3;
1633 /* Does it look like a be 0(sr0,%r21)? OR
1634 Does it look like a be, n 0(sr0,%r21)? OR
1635 Does it look like a bve (r21)? (this is on PA2.0)
1636 Does it look like a bve, n(r21)? (this is also on PA2.0)
1637 That's the branch from an
1638 import stub to an export stub.
1640 It is impossible to determine the target of the branch via
1641 simple examination of instructions and/or data (consider
1642 that the address in the plabel may be the address of the
1643 bind-on-reference routine in the dynamic loader).
1645 So we have try an alternative approach.
1647 Get the name of the symbol at our current location; it should
1648 be a stub symbol with the same name as the symbol in the
1651 Then lookup a minimal symbol with the same name; we should
1652 get the minimal symbol for the target routine in the shared
1653 library as those take precedence of import/export stubs. */
1654 if ((curr_inst
== 0xe2a00000) ||
1655 (curr_inst
== 0xe2a00002) ||
1656 (curr_inst
== 0xeaa0d000) ||
1657 (curr_inst
== 0xeaa0d002))
1659 struct minimal_symbol
*stubsym
, *libsym
;
1661 stubsym
= lookup_minimal_symbol_by_pc (loc
);
1662 if (stubsym
== NULL
)
1664 warning ("Unable to find symbol for 0x%lx", loc
);
1665 return orig_pc
== pc
? 0 : pc
& ~0x3;
1668 libsym
= lookup_minimal_symbol (DEPRECATED_SYMBOL_NAME (stubsym
), NULL
, NULL
);
1671 warning ("Unable to find library symbol for %s\n",
1672 DEPRECATED_SYMBOL_NAME (stubsym
));
1673 return orig_pc
== pc
? 0 : pc
& ~0x3;
1676 return SYMBOL_VALUE (libsym
);
1679 /* Does it look like bl X,%rp or bl X,%r0? Another way to do a
1680 branch from the stub to the actual function. */
1682 else if ((curr_inst
& 0xffe0e000) == 0xe8400000
1683 || (curr_inst
& 0xffe0e000) == 0xe8000000
1684 || (curr_inst
& 0xffe0e000) == 0xe800A000)
1685 return (loc
+ extract_17 (curr_inst
) + 8) & ~0x3;
1687 /* Does it look like bv (rp)? Note this depends on the
1688 current stack pointer being the same as the stack
1689 pointer in the stub itself! This is a branch on from the
1690 stub back to the original caller. */
1691 /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */
1692 else if ((curr_inst
& 0xffe0f000) == 0xe840c000)
1694 /* Yup. See if the previous instruction loaded
1696 if (prev_inst
== 0x4bc23ff1)
1697 return (read_memory_integer
1698 (read_register (HPPA_SP_REGNUM
) - 8, 4)) & ~0x3;
1701 warning ("Unable to find restore of %%rp before bv (%%rp).");
1702 return orig_pc
== pc
? 0 : pc
& ~0x3;
1706 /* elz: added this case to capture the new instruction
1707 at the end of the return part of an export stub used by
1708 the PA2.0: BVE, n (rp) */
1709 else if ((curr_inst
& 0xffe0f000) == 0xe840d000)
1711 return (read_memory_integer
1712 (read_register (HPPA_SP_REGNUM
) - 24, TARGET_PTR_BIT
/ 8)) & ~0x3;
1715 /* What about be,n 0(sr0,%rp)? It's just another way we return to
1716 the original caller from the stub. Used in dynamic executables. */
1717 else if (curr_inst
== 0xe0400002)
1719 /* The value we jump to is sitting in sp - 24. But that's
1720 loaded several instructions before the be instruction.
1721 I guess we could check for the previous instruction being
1722 mtsp %r1,%sr0 if we want to do sanity checking. */
1723 return (read_memory_integer
1724 (read_register (HPPA_SP_REGNUM
) - 24, TARGET_PTR_BIT
/ 8)) & ~0x3;
1727 /* Haven't found the branch yet, but we're still in the stub.
1734 /* For the given instruction (INST), return any adjustment it makes
1735 to the stack pointer or zero for no adjustment.
1737 This only handles instructions commonly found in prologues. */
1740 prologue_inst_adjust_sp (unsigned long inst
)
1742 /* This must persist across calls. */
1743 static int save_high21
;
1745 /* The most common way to perform a stack adjustment ldo X(sp),sp */
1746 if ((inst
& 0xffffc000) == 0x37de0000)
1747 return extract_14 (inst
);
1750 if ((inst
& 0xffe00000) == 0x6fc00000)
1751 return extract_14 (inst
);
1753 /* std,ma X,D(sp) */
1754 if ((inst
& 0xffe00008) == 0x73c00008)
1755 return (inst
& 0x1 ? -1 << 13 : 0) | (((inst
>> 4) & 0x3ff) << 3);
1757 /* addil high21,%r1; ldo low11,(%r1),%r30)
1758 save high bits in save_high21 for later use. */
1759 if ((inst
& 0xffe00000) == 0x28200000)
1761 save_high21
= extract_21 (inst
);
1765 if ((inst
& 0xffff0000) == 0x343e0000)
1766 return save_high21
+ extract_14 (inst
);
1768 /* fstws as used by the HP compilers. */
1769 if ((inst
& 0xffffffe0) == 0x2fd01220)
1770 return extract_5_load (inst
);
1772 /* No adjustment. */
1776 /* Return nonzero if INST is a branch of some kind, else return zero. */
1779 is_branch (unsigned long inst
)
1808 /* Return the register number for a GR which is saved by INST or
1809 zero it INST does not save a GR. */
1812 inst_saves_gr (unsigned long inst
)
1814 /* Does it look like a stw? */
1815 if ((inst
>> 26) == 0x1a || (inst
>> 26) == 0x1b
1816 || (inst
>> 26) == 0x1f
1817 || ((inst
>> 26) == 0x1f
1818 && ((inst
>> 6) == 0xa)))
1819 return extract_5R_store (inst
);
1821 /* Does it look like a std? */
1822 if ((inst
>> 26) == 0x1c
1823 || ((inst
>> 26) == 0x03
1824 && ((inst
>> 6) & 0xf) == 0xb))
1825 return extract_5R_store (inst
);
1827 /* Does it look like a stwm? GCC & HPC may use this in prologues. */
1828 if ((inst
>> 26) == 0x1b)
1829 return extract_5R_store (inst
);
1831 /* Does it look like sth or stb? HPC versions 9.0 and later use these
1833 if ((inst
>> 26) == 0x19 || (inst
>> 26) == 0x18
1834 || ((inst
>> 26) == 0x3
1835 && (((inst
>> 6) & 0xf) == 0x8
1836 || (inst
>> 6) & 0xf) == 0x9))
1837 return extract_5R_store (inst
);
1842 /* Return the register number for a FR which is saved by INST or
1843 zero it INST does not save a FR.
1845 Note we only care about full 64bit register stores (that's the only
1846 kind of stores the prologue will use).
1848 FIXME: What about argument stores with the HP compiler in ANSI mode? */
1851 inst_saves_fr (unsigned long inst
)
1853 /* is this an FSTD ? */
1854 if ((inst
& 0xfc00dfc0) == 0x2c001200)
1855 return extract_5r_store (inst
);
1856 if ((inst
& 0xfc000002) == 0x70000002)
1857 return extract_5R_store (inst
);
1858 /* is this an FSTW ? */
1859 if ((inst
& 0xfc00df80) == 0x24001200)
1860 return extract_5r_store (inst
);
1861 if ((inst
& 0xfc000002) == 0x7c000000)
1862 return extract_5R_store (inst
);
1866 /* Advance PC across any function entry prologue instructions
1867 to reach some "real" code.
1869 Use information in the unwind table to determine what exactly should
1870 be in the prologue. */
1874 skip_prologue_hard_way (CORE_ADDR pc
)
1877 CORE_ADDR orig_pc
= pc
;
1878 unsigned long inst
, stack_remaining
, save_gr
, save_fr
, save_rp
, save_sp
;
1879 unsigned long args_stored
, status
, i
, restart_gr
, restart_fr
;
1880 struct unwind_table_entry
*u
;
1886 u
= find_unwind_entry (pc
);
1890 /* If we are not at the beginning of a function, then return now. */
1891 if ((pc
& ~0x3) != u
->region_start
)
1894 /* This is how much of a frame adjustment we need to account for. */
1895 stack_remaining
= u
->Total_frame_size
<< 3;
1897 /* Magic register saves we want to know about. */
1898 save_rp
= u
->Save_RP
;
1899 save_sp
= u
->Save_SP
;
1901 /* An indication that args may be stored into the stack. Unfortunately
1902 the HPUX compilers tend to set this in cases where no args were
1906 /* Turn the Entry_GR field into a bitmask. */
1908 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
1910 /* Frame pointer gets saved into a special location. */
1911 if (u
->Save_SP
&& i
== HPPA_FP_REGNUM
)
1914 save_gr
|= (1 << i
);
1916 save_gr
&= ~restart_gr
;
1918 /* Turn the Entry_FR field into a bitmask too. */
1920 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
1921 save_fr
|= (1 << i
);
1922 save_fr
&= ~restart_fr
;
1924 /* Loop until we find everything of interest or hit a branch.
1926 For unoptimized GCC code and for any HP CC code this will never ever
1927 examine any user instructions.
1929 For optimzied GCC code we're faced with problems. GCC will schedule
1930 its prologue and make prologue instructions available for delay slot
1931 filling. The end result is user code gets mixed in with the prologue
1932 and a prologue instruction may be in the delay slot of the first branch
1935 Some unexpected things are expected with debugging optimized code, so
1936 we allow this routine to walk past user instructions in optimized
1938 while (save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0
1941 unsigned int reg_num
;
1942 unsigned long old_stack_remaining
, old_save_gr
, old_save_fr
;
1943 unsigned long old_save_rp
, old_save_sp
, next_inst
;
1945 /* Save copies of all the triggers so we can compare them later
1947 old_save_gr
= save_gr
;
1948 old_save_fr
= save_fr
;
1949 old_save_rp
= save_rp
;
1950 old_save_sp
= save_sp
;
1951 old_stack_remaining
= stack_remaining
;
1953 status
= target_read_memory (pc
, buf
, 4);
1954 inst
= extract_unsigned_integer (buf
, 4);
1960 /* Note the interesting effects of this instruction. */
1961 stack_remaining
-= prologue_inst_adjust_sp (inst
);
1963 /* There are limited ways to store the return pointer into the
1965 if (inst
== 0x6bc23fd9 || inst
== 0x0fc212c1)
1968 /* These are the only ways we save SP into the stack. At this time
1969 the HP compilers never bother to save SP into the stack. */
1970 if ((inst
& 0xffffc000) == 0x6fc10000
1971 || (inst
& 0xffffc00c) == 0x73c10008)
1974 /* Are we loading some register with an offset from the argument
1976 if ((inst
& 0xffe00000) == 0x37a00000
1977 || (inst
& 0xffffffe0) == 0x081d0240)
1983 /* Account for general and floating-point register saves. */
1984 reg_num
= inst_saves_gr (inst
);
1985 save_gr
&= ~(1 << reg_num
);
1987 /* Ugh. Also account for argument stores into the stack.
1988 Unfortunately args_stored only tells us that some arguments
1989 where stored into the stack. Not how many or what kind!
1991 This is a kludge as on the HP compiler sets this bit and it
1992 never does prologue scheduling. So once we see one, skip past
1993 all of them. We have similar code for the fp arg stores below.
1995 FIXME. Can still die if we have a mix of GR and FR argument
1997 if (reg_num
>= (TARGET_PTR_BIT
== 64 ? 19 : 23) && reg_num
<= 26)
1999 while (reg_num
>= (TARGET_PTR_BIT
== 64 ? 19 : 23) && reg_num
<= 26)
2002 status
= target_read_memory (pc
, buf
, 4);
2003 inst
= extract_unsigned_integer (buf
, 4);
2006 reg_num
= inst_saves_gr (inst
);
2012 reg_num
= inst_saves_fr (inst
);
2013 save_fr
&= ~(1 << reg_num
);
2015 status
= target_read_memory (pc
+ 4, buf
, 4);
2016 next_inst
= extract_unsigned_integer (buf
, 4);
2022 /* We've got to be read to handle the ldo before the fp register
2024 if ((inst
& 0xfc000000) == 0x34000000
2025 && inst_saves_fr (next_inst
) >= 4
2026 && inst_saves_fr (next_inst
) <= (TARGET_PTR_BIT
== 64 ? 11 : 7))
2028 /* So we drop into the code below in a reasonable state. */
2029 reg_num
= inst_saves_fr (next_inst
);
2033 /* Ugh. Also account for argument stores into the stack.
2034 This is a kludge as on the HP compiler sets this bit and it
2035 never does prologue scheduling. So once we see one, skip past
2037 if (reg_num
>= 4 && reg_num
<= (TARGET_PTR_BIT
== 64 ? 11 : 7))
2039 while (reg_num
>= 4 && reg_num
<= (TARGET_PTR_BIT
== 64 ? 11 : 7))
2042 status
= target_read_memory (pc
, buf
, 4);
2043 inst
= extract_unsigned_integer (buf
, 4);
2046 if ((inst
& 0xfc000000) != 0x34000000)
2048 status
= target_read_memory (pc
+ 4, buf
, 4);
2049 next_inst
= extract_unsigned_integer (buf
, 4);
2052 reg_num
= inst_saves_fr (next_inst
);
2058 /* Quit if we hit any kind of branch. This can happen if a prologue
2059 instruction is in the delay slot of the first call/branch. */
2060 if (is_branch (inst
))
2063 /* What a crock. The HP compilers set args_stored even if no
2064 arguments were stored into the stack (boo hiss). This could
2065 cause this code to then skip a bunch of user insns (up to the
2068 To combat this we try to identify when args_stored was bogusly
2069 set and clear it. We only do this when args_stored is nonzero,
2070 all other resources are accounted for, and nothing changed on
2073 && !(save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0)
2074 && old_save_gr
== save_gr
&& old_save_fr
== save_fr
2075 && old_save_rp
== save_rp
&& old_save_sp
== save_sp
2076 && old_stack_remaining
== stack_remaining
)
2083 /* We've got a tenative location for the end of the prologue. However
2084 because of limitations in the unwind descriptor mechanism we may
2085 have went too far into user code looking for the save of a register
2086 that does not exist. So, if there registers we expected to be saved
2087 but never were, mask them out and restart.
2089 This should only happen in optimized code, and should be very rare. */
2090 if (save_gr
|| (save_fr
&& !(restart_fr
|| restart_gr
)))
2093 restart_gr
= save_gr
;
2094 restart_fr
= save_fr
;
2102 /* Return the address of the PC after the last prologue instruction if
2103 we can determine it from the debug symbols. Else return zero. */
2106 after_prologue (CORE_ADDR pc
)
2108 struct symtab_and_line sal
;
2109 CORE_ADDR func_addr
, func_end
;
2112 /* If we can not find the symbol in the partial symbol table, then
2113 there is no hope we can determine the function's start address
2115 if (!find_pc_partial_function (pc
, NULL
, &func_addr
, &func_end
))
2118 /* Get the line associated with FUNC_ADDR. */
2119 sal
= find_pc_line (func_addr
, 0);
2121 /* There are only two cases to consider. First, the end of the source line
2122 is within the function bounds. In that case we return the end of the
2123 source line. Second is the end of the source line extends beyond the
2124 bounds of the current function. We need to use the slow code to
2125 examine instructions in that case.
2127 Anything else is simply a bug elsewhere. Fixing it here is absolutely
2128 the wrong thing to do. In fact, it should be entirely possible for this
2129 function to always return zero since the slow instruction scanning code
2130 is supposed to *always* work. If it does not, then it is a bug. */
2131 if (sal
.end
< func_end
)
2137 /* To skip prologues, I use this predicate. Returns either PC itself
2138 if the code at PC does not look like a function prologue; otherwise
2139 returns an address that (if we're lucky) follows the prologue. If
2140 LENIENT, then we must skip everything which is involved in setting
2141 up the frame (it's OK to skip more, just so long as we don't skip
2142 anything which might clobber the registers which are being saved.
2143 Currently we must not skip more on the alpha, but we might the lenient
2147 hppa_skip_prologue (CORE_ADDR pc
)
2151 CORE_ADDR post_prologue_pc
;
2154 /* See if we can determine the end of the prologue via the symbol table.
2155 If so, then return either PC, or the PC after the prologue, whichever
2158 post_prologue_pc
= after_prologue (pc
);
2160 /* If after_prologue returned a useful address, then use it. Else
2161 fall back on the instruction skipping code.
2163 Some folks have claimed this causes problems because the breakpoint
2164 may be the first instruction of the prologue. If that happens, then
2165 the instruction skipping code has a bug that needs to be fixed. */
2166 if (post_prologue_pc
!= 0)
2167 return max (pc
, post_prologue_pc
);
2169 return (skip_prologue_hard_way (pc
));
2172 struct hppa_frame_cache
2175 struct trad_frame_saved_reg
*saved_regs
;
2178 static struct hppa_frame_cache
*
2179 hppa_frame_cache (struct frame_info
*next_frame
, void **this_cache
)
2181 struct hppa_frame_cache
*cache
;
2186 struct unwind_table_entry
*u
;
2189 if ((*this_cache
) != NULL
)
2190 return (*this_cache
);
2191 cache
= FRAME_OBSTACK_ZALLOC (struct hppa_frame_cache
);
2192 (*this_cache
) = cache
;
2193 cache
->saved_regs
= trad_frame_alloc_saved_regs (next_frame
);
2196 u
= find_unwind_entry (frame_func_unwind (next_frame
));
2198 return (*this_cache
);
2200 /* Turn the Entry_GR field into a bitmask. */
2202 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
2204 /* Frame pointer gets saved into a special location. */
2205 if (u
->Save_SP
&& i
== HPPA_FP_REGNUM
)
2208 saved_gr_mask
|= (1 << i
);
2211 /* Turn the Entry_FR field into a bitmask too. */
2213 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
2214 saved_fr_mask
|= (1 << i
);
2216 /* Loop until we find everything of interest or hit a branch.
2218 For unoptimized GCC code and for any HP CC code this will never ever
2219 examine any user instructions.
2221 For optimized GCC code we're faced with problems. GCC will schedule
2222 its prologue and make prologue instructions available for delay slot
2223 filling. The end result is user code gets mixed in with the prologue
2224 and a prologue instruction may be in the delay slot of the first branch
2227 Some unexpected things are expected with debugging optimized code, so
2228 we allow this routine to walk past user instructions in optimized
2231 int final_iteration
= 0;
2233 CORE_ADDR end_pc
= skip_prologue_using_sal (pc
);
2234 int looking_for_sp
= u
->Save_SP
;
2235 int looking_for_rp
= u
->Save_RP
;
2238 end_pc
= frame_pc_unwind (next_frame
);
2240 for (pc
= frame_func_unwind (next_frame
);
2241 ((saved_gr_mask
|| saved_fr_mask
2242 || looking_for_sp
|| looking_for_rp
2243 || frame_size
< (u
->Total_frame_size
<< 3))
2249 long status
= target_read_memory (pc
, buf4
, sizeof buf4
);
2250 long inst
= extract_unsigned_integer (buf4
, sizeof buf4
);
2252 /* Note the interesting effects of this instruction. */
2253 frame_size
+= prologue_inst_adjust_sp (inst
);
2255 /* There are limited ways to store the return pointer into the
2257 if (inst
== 0x6bc23fd9) /* stw rp,-0x14(sr0,sp) */
2260 cache
->saved_regs
[RP_REGNUM
].addr
= -20;
2262 else if (inst
== 0x0fc212c1) /* std rp,-0x10(sr0,sp) */
2265 cache
->saved_regs
[RP_REGNUM
].addr
= -16;
2268 /* Check to see if we saved SP into the stack. This also
2269 happens to indicate the location of the saved frame
2271 if ((inst
& 0xffffc000) == 0x6fc10000 /* stw,ma r1,N(sr0,sp) */
2272 || (inst
& 0xffffc00c) == 0x73c10008) /* std,ma r1,N(sr0,sp) */
2275 cache
->saved_regs
[HPPA_FP_REGNUM
].addr
= 0;
2278 /* Account for general and floating-point register saves. */
2279 reg
= inst_saves_gr (inst
);
2280 if (reg
>= 3 && reg
<= 18
2281 && (!u
->Save_SP
|| reg
!= HPPA_FP_REGNUM
))
2283 saved_gr_mask
&= ~(1 << reg
);
2284 if ((inst
>> 26) == 0x1b && extract_14 (inst
) >= 0)
2285 /* stwm with a positive displacement is a _post_
2287 cache
->saved_regs
[reg
].addr
= 0;
2288 else if ((inst
& 0xfc00000c) == 0x70000008)
2289 /* A std has explicit post_modify forms. */
2290 cache
->saved_regs
[reg
].addr
= 0;
2295 if ((inst
>> 26) == 0x1c)
2296 offset
= (inst
& 0x1 ? -1 << 13 : 0) | (((inst
>> 4) & 0x3ff) << 3);
2297 else if ((inst
>> 26) == 0x03)
2298 offset
= low_sign_extend (inst
& 0x1f, 5);
2300 offset
= extract_14 (inst
);
2302 /* Handle code with and without frame pointers. */
2304 cache
->saved_regs
[reg
].addr
= offset
;
2306 cache
->saved_regs
[reg
].addr
= (u
->Total_frame_size
<< 3) + offset
;
2310 /* GCC handles callee saved FP regs a little differently.
2312 It emits an instruction to put the value of the start of
2313 the FP store area into %r1. It then uses fstds,ma with a
2314 basereg of %r1 for the stores.
2316 HP CC emits them at the current stack pointer modifying the
2317 stack pointer as it stores each register. */
2319 /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */
2320 if ((inst
& 0xffffc000) == 0x34610000
2321 || (inst
& 0xffffc000) == 0x37c10000)
2322 fp_loc
= extract_14 (inst
);
2324 reg
= inst_saves_fr (inst
);
2325 if (reg
>= 12 && reg
<= 21)
2327 /* Note +4 braindamage below is necessary because the FP
2328 status registers are internally 8 registers rather than
2329 the expected 4 registers. */
2330 saved_fr_mask
&= ~(1 << reg
);
2333 /* 1st HP CC FP register store. After this
2334 instruction we've set enough state that the GCC and
2335 HPCC code are both handled in the same manner. */
2336 cache
->saved_regs
[reg
+ FP4_REGNUM
+ 4].addr
= 0;
2341 cache
->saved_regs
[reg
+ HPPA_FP0_REGNUM
+ 4].addr
= fp_loc
;
2346 /* Quit if we hit any kind of branch the previous iteration. */
2347 if (final_iteration
)
2349 /* We want to look precisely one instruction beyond the branch
2350 if we have not found everything yet. */
2351 if (is_branch (inst
))
2352 final_iteration
= 1;
2357 /* The frame base always represents the value of %sp at entry to
2358 the current function (and is thus equivalent to the "saved"
2360 CORE_ADDR this_sp
= frame_unwind_register_unsigned (next_frame
, HPPA_SP_REGNUM
);
2361 /* FIXME: cagney/2004-02-22: This assumes that the frame has been
2362 created. If it hasn't everything will be out-of-wack. */
2363 if (u
->Save_SP
&& trad_frame_addr_p (cache
->saved_regs
, HPPA_SP_REGNUM
))
2364 /* Both we're expecting the SP to be saved and the SP has been
2365 saved. The entry SP value is saved at this frame's SP
2367 cache
->base
= read_memory_integer (this_sp
, TARGET_PTR_BIT
/ 8);
2369 /* The prologue has been slowly allocating stack space. Adjust
2371 cache
->base
= this_sp
- frame_size
;
2372 trad_frame_set_value (cache
->saved_regs
, HPPA_SP_REGNUM
, cache
->base
);
2375 /* The PC is found in the "return register", "Millicode" uses "r31"
2376 as the return register while normal code uses "rp". */
2378 cache
->saved_regs
[PCOQ_HEAD_REGNUM
] = cache
->saved_regs
[31];
2380 cache
->saved_regs
[PCOQ_HEAD_REGNUM
] = cache
->saved_regs
[RP_REGNUM
];
2383 /* Convert all the offsets into addresses. */
2385 for (reg
= 0; reg
< NUM_REGS
; reg
++)
2387 if (trad_frame_addr_p (cache
->saved_regs
, reg
))
2388 cache
->saved_regs
[reg
].addr
+= cache
->base
;
2392 return (*this_cache
);
2396 hppa_frame_this_id (struct frame_info
*next_frame
, void **this_cache
,
2397 struct frame_id
*this_id
)
2399 struct hppa_frame_cache
*info
= hppa_frame_cache (next_frame
, this_cache
);
2400 (*this_id
) = frame_id_build (info
->base
, frame_func_unwind (next_frame
));
2404 hppa_frame_prev_register (struct frame_info
*next_frame
,
2406 int regnum
, int *optimizedp
,
2407 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
2408 int *realnump
, void *valuep
)
2410 struct hppa_frame_cache
*info
= hppa_frame_cache (next_frame
, this_cache
);
2411 struct gdbarch
*gdbarch
= get_frame_arch (next_frame
);
2412 if (regnum
== PCOQ_TAIL_REGNUM
)
2414 /* The PCOQ TAIL, or NPC, needs to be computed from the unwound
2422 int regsize
= register_size (gdbarch
, PCOQ_HEAD_REGNUM
);
2425 enum lval_type lval
;
2428 bfd_byte value
[MAX_REGISTER_SIZE
];
2429 trad_frame_prev_register (next_frame
, info
->saved_regs
,
2430 PCOQ_HEAD_REGNUM
, &optimized
, &lval
, &addr
,
2432 pc
= extract_unsigned_integer (&value
, regsize
);
2433 store_unsigned_integer (valuep
, regsize
, pc
+ 4);
2438 trad_frame_prev_register (next_frame
, info
->saved_regs
, regnum
,
2439 optimizedp
, lvalp
, addrp
, realnump
, valuep
);
2443 static const struct frame_unwind hppa_frame_unwind
=
2447 hppa_frame_prev_register
2450 static const struct frame_unwind
*
2451 hppa_frame_unwind_sniffer (struct frame_info
*next_frame
)
2453 return &hppa_frame_unwind
;
2457 hppa_frame_base_address (struct frame_info
*next_frame
,
2460 struct hppa_frame_cache
*info
= hppa_frame_cache (next_frame
,
2465 static const struct frame_base hppa_frame_base
= {
2467 hppa_frame_base_address
,
2468 hppa_frame_base_address
,
2469 hppa_frame_base_address
2472 static const struct frame_base
*
2473 hppa_frame_base_sniffer (struct frame_info
*next_frame
)
2475 return &hppa_frame_base
;
2478 static struct frame_id
2479 hppa_unwind_dummy_id (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
2481 return frame_id_build (frame_unwind_register_unsigned (next_frame
,
2483 frame_pc_unwind (next_frame
));
2487 hppa_unwind_pc (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
2489 return frame_unwind_register_signed (next_frame
, PCOQ_HEAD_REGNUM
) & ~3;
2492 /* Exception handling support for the HP-UX ANSI C++ compiler.
2493 The compiler (aCC) provides a callback for exception events;
2494 GDB can set a breakpoint on this callback and find out what
2495 exception event has occurred. */
2497 /* The name of the hook to be set to point to the callback function */
2498 static char HP_ACC_EH_notify_hook
[] = "__eh_notify_hook";
2499 /* The name of the function to be used to set the hook value */
2500 static char HP_ACC_EH_set_hook_value
[] = "__eh_set_hook_value";
2501 /* The name of the callback function in end.o */
2502 static char HP_ACC_EH_notify_callback
[] = "__d_eh_notify_callback";
2503 /* Name of function in end.o on which a break is set (called by above) */
2504 static char HP_ACC_EH_break
[] = "__d_eh_break";
2505 /* Name of flag (in end.o) that enables catching throws */
2506 static char HP_ACC_EH_catch_throw
[] = "__d_eh_catch_throw";
2507 /* Name of flag (in end.o) that enables catching catching */
2508 static char HP_ACC_EH_catch_catch
[] = "__d_eh_catch_catch";
2509 /* The enum used by aCC */
2517 /* Is exception-handling support available with this executable? */
2518 static int hp_cxx_exception_support
= 0;
2519 /* Has the initialize function been run? */
2520 int hp_cxx_exception_support_initialized
= 0;
2521 /* Similar to above, but imported from breakpoint.c -- non-target-specific */
2522 extern int exception_support_initialized
;
2523 /* Address of __eh_notify_hook */
2524 static CORE_ADDR eh_notify_hook_addr
= 0;
2525 /* Address of __d_eh_notify_callback */
2526 static CORE_ADDR eh_notify_callback_addr
= 0;
2527 /* Address of __d_eh_break */
2528 static CORE_ADDR eh_break_addr
= 0;
2529 /* Address of __d_eh_catch_catch */
2530 static CORE_ADDR eh_catch_catch_addr
= 0;
2531 /* Address of __d_eh_catch_throw */
2532 static CORE_ADDR eh_catch_throw_addr
= 0;
2533 /* Sal for __d_eh_break */
2534 static struct symtab_and_line
*break_callback_sal
= 0;
2536 /* Code in end.c expects __d_pid to be set in the inferior,
2537 otherwise __d_eh_notify_callback doesn't bother to call
2538 __d_eh_break! So we poke the pid into this symbol
2543 setup_d_pid_in_inferior (void)
2546 struct minimal_symbol
*msymbol
;
2547 char buf
[4]; /* FIXME 32x64? */
2549 /* Slam the pid of the process into __d_pid; failing is only a warning! */
2550 msymbol
= lookup_minimal_symbol ("__d_pid", NULL
, symfile_objfile
);
2551 if (msymbol
== NULL
)
2553 warning ("Unable to find __d_pid symbol in object file.");
2554 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
2558 anaddr
= SYMBOL_VALUE_ADDRESS (msymbol
);
2559 store_unsigned_integer (buf
, 4, PIDGET (inferior_ptid
)); /* FIXME 32x64? */
2560 if (target_write_memory (anaddr
, buf
, 4)) /* FIXME 32x64? */
2562 warning ("Unable to write __d_pid");
2563 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
2569 /* Initialize exception catchpoint support by looking for the
2570 necessary hooks/callbacks in end.o, etc., and set the hook value to
2571 point to the required debug function
2577 initialize_hp_cxx_exception_support (void)
2579 struct symtabs_and_lines sals
;
2580 struct cleanup
*old_chain
;
2581 struct cleanup
*canonical_strings_chain
= NULL
;
2584 char *addr_end
= NULL
;
2585 char **canonical
= (char **) NULL
;
2587 struct symbol
*sym
= NULL
;
2588 struct minimal_symbol
*msym
= NULL
;
2589 struct objfile
*objfile
;
2590 asection
*shlib_info
;
2592 /* Detect and disallow recursion. On HP-UX with aCC, infinite
2593 recursion is a possibility because finding the hook for exception
2594 callbacks involves making a call in the inferior, which means
2595 re-inserting breakpoints which can re-invoke this code */
2597 static int recurse
= 0;
2600 hp_cxx_exception_support_initialized
= 0;
2601 exception_support_initialized
= 0;
2605 hp_cxx_exception_support
= 0;
2607 /* First check if we have seen any HP compiled objects; if not,
2608 it is very unlikely that HP's idiosyncratic callback mechanism
2609 for exception handling debug support will be available!
2610 This will percolate back up to breakpoint.c, where our callers
2611 will decide to try the g++ exception-handling support instead. */
2612 if (!hp_som_som_object_present
)
2615 /* We have a SOM executable with SOM debug info; find the hooks */
2617 /* First look for the notify hook provided by aCC runtime libs */
2618 /* If we find this symbol, we conclude that the executable must
2619 have HP aCC exception support built in. If this symbol is not
2620 found, even though we're a HP SOM-SOM file, we may have been
2621 built with some other compiler (not aCC). This results percolates
2622 back up to our callers in breakpoint.c which can decide to
2623 try the g++ style of exception support instead.
2624 If this symbol is found but the other symbols we require are
2625 not found, there is something weird going on, and g++ support
2626 should *not* be tried as an alternative.
2628 ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined.
2629 ASSUMPTION: HP aCC and g++ modules cannot be linked together. */
2631 /* libCsup has this hook; it'll usually be non-debuggable */
2632 msym
= lookup_minimal_symbol (HP_ACC_EH_notify_hook
, NULL
, NULL
);
2635 eh_notify_hook_addr
= SYMBOL_VALUE_ADDRESS (msym
);
2636 hp_cxx_exception_support
= 1;
2640 warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook
);
2641 warning ("Executable may not have been compiled debuggable with HP aCC.");
2642 warning ("GDB will be unable to intercept exception events.");
2643 eh_notify_hook_addr
= 0;
2644 hp_cxx_exception_support
= 0;
2648 /* Next look for the notify callback routine in end.o */
2649 /* This is always available in the SOM symbol dictionary if end.o is linked in */
2650 msym
= lookup_minimal_symbol (HP_ACC_EH_notify_callback
, NULL
, NULL
);
2653 eh_notify_callback_addr
= SYMBOL_VALUE_ADDRESS (msym
);
2654 hp_cxx_exception_support
= 1;
2658 warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback
);
2659 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
2660 warning ("GDB will be unable to intercept exception events.");
2661 eh_notify_callback_addr
= 0;
2665 #ifndef GDB_TARGET_IS_HPPA_20W
2666 /* Check whether the executable is dynamically linked or archive bound */
2667 /* With an archive-bound executable we can use the raw addresses we find
2668 for the callback function, etc. without modification. For an executable
2669 with shared libraries, we have to do more work to find the plabel, which
2670 can be the target of a call through $$dyncall from the aCC runtime support
2671 library (libCsup) which is linked shared by default by aCC. */
2672 /* This test below was copied from somsolib.c/somread.c. It may not be a very
2673 reliable one to test that an executable is linked shared. pai/1997-07-18 */
2674 shlib_info
= bfd_get_section_by_name (symfile_objfile
->obfd
, "$SHLIB_INFO$");
2675 if (shlib_info
&& (bfd_section_size (symfile_objfile
->obfd
, shlib_info
) != 0))
2677 /* The minsym we have has the local code address, but that's not the
2678 plabel that can be used by an inter-load-module call. */
2679 /* Find solib handle for main image (which has end.o), and use that
2680 and the min sym as arguments to __d_shl_get() (which does the equivalent
2681 of shl_findsym()) to find the plabel. */
2683 args_for_find_stub args
;
2684 static char message
[] = "Error while finding exception callback hook:\n";
2686 args
.solib_handle
= som_solib_get_solib_by_pc (eh_notify_callback_addr
);
2688 args
.return_val
= 0;
2691 catch_errors (cover_find_stub_with_shl_get
, &args
, message
,
2693 eh_notify_callback_addr
= args
.return_val
;
2696 exception_catchpoints_are_fragile
= 1;
2698 if (!eh_notify_callback_addr
)
2700 /* We can get here either if there is no plabel in the export list
2701 for the main image, or if something strange happened (?) */
2702 warning ("Couldn't find a plabel (indirect function label) for the exception callback.");
2703 warning ("GDB will not be able to intercept exception events.");
2708 exception_catchpoints_are_fragile
= 0;
2711 /* Now, look for the breakpointable routine in end.o */
2712 /* This should also be available in the SOM symbol dict. if end.o linked in */
2713 msym
= lookup_minimal_symbol (HP_ACC_EH_break
, NULL
, NULL
);
2716 eh_break_addr
= SYMBOL_VALUE_ADDRESS (msym
);
2717 hp_cxx_exception_support
= 1;
2721 warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break
);
2722 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
2723 warning ("GDB will be unable to intercept exception events.");
2728 /* Next look for the catch enable flag provided in end.o */
2729 sym
= lookup_symbol (HP_ACC_EH_catch_catch
, (struct block
*) NULL
,
2730 VAR_DOMAIN
, 0, (struct symtab
**) NULL
);
2731 if (sym
) /* sometimes present in debug info */
2733 eh_catch_catch_addr
= SYMBOL_VALUE_ADDRESS (sym
);
2734 hp_cxx_exception_support
= 1;
2737 /* otherwise look in SOM symbol dict. */
2739 msym
= lookup_minimal_symbol (HP_ACC_EH_catch_catch
, NULL
, NULL
);
2742 eh_catch_catch_addr
= SYMBOL_VALUE_ADDRESS (msym
);
2743 hp_cxx_exception_support
= 1;
2747 warning ("Unable to enable interception of exception catches.");
2748 warning ("Executable may not have been compiled debuggable with HP aCC.");
2749 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
2754 /* Next look for the catch enable flag provided end.o */
2755 sym
= lookup_symbol (HP_ACC_EH_catch_catch
, (struct block
*) NULL
,
2756 VAR_DOMAIN
, 0, (struct symtab
**) NULL
);
2757 if (sym
) /* sometimes present in debug info */
2759 eh_catch_throw_addr
= SYMBOL_VALUE_ADDRESS (sym
);
2760 hp_cxx_exception_support
= 1;
2763 /* otherwise look in SOM symbol dict. */
2765 msym
= lookup_minimal_symbol (HP_ACC_EH_catch_throw
, NULL
, NULL
);
2768 eh_catch_throw_addr
= SYMBOL_VALUE_ADDRESS (msym
);
2769 hp_cxx_exception_support
= 1;
2773 warning ("Unable to enable interception of exception throws.");
2774 warning ("Executable may not have been compiled debuggable with HP aCC.");
2775 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
2781 hp_cxx_exception_support
= 2; /* everything worked so far */
2782 hp_cxx_exception_support_initialized
= 1;
2783 exception_support_initialized
= 1;
2788 /* Target operation for enabling or disabling interception of
2790 KIND is either EX_EVENT_THROW or EX_EVENT_CATCH
2791 ENABLE is either 0 (disable) or 1 (enable).
2792 Return value is NULL if no support found;
2793 -1 if something went wrong,
2794 or a pointer to a symtab/line struct if the breakpointable
2795 address was found. */
2797 struct symtab_and_line
*
2798 child_enable_exception_callback (enum exception_event_kind kind
, int enable
)
2802 if (!exception_support_initialized
|| !hp_cxx_exception_support_initialized
)
2803 if (!initialize_hp_cxx_exception_support ())
2806 switch (hp_cxx_exception_support
)
2809 /* Assuming no HP support at all */
2812 /* HP support should be present, but something went wrong */
2813 return (struct symtab_and_line
*) -1; /* yuck! */
2814 /* there may be other cases in the future */
2817 /* Set the EH hook to point to the callback routine */
2818 store_unsigned_integer (buf
, 4, enable
? eh_notify_callback_addr
: 0); /* FIXME 32x64 problem */
2819 /* pai: (temp) FIXME should there be a pack operation first? */
2820 if (target_write_memory (eh_notify_hook_addr
, buf
, 4)) /* FIXME 32x64 problem */
2822 warning ("Could not write to target memory for exception event callback.");
2823 warning ("Interception of exception events may not work.");
2824 return (struct symtab_and_line
*) -1;
2828 /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */
2829 if (PIDGET (inferior_ptid
) > 0)
2831 if (setup_d_pid_in_inferior ())
2832 return (struct symtab_and_line
*) -1;
2836 warning ("Internal error: Invalid inferior pid? Cannot intercept exception events.");
2837 return (struct symtab_and_line
*) -1;
2843 case EX_EVENT_THROW
:
2844 store_unsigned_integer (buf
, 4, enable
? 1 : 0);
2845 if (target_write_memory (eh_catch_throw_addr
, buf
, 4)) /* FIXME 32x64? */
2847 warning ("Couldn't enable exception throw interception.");
2848 return (struct symtab_and_line
*) -1;
2851 case EX_EVENT_CATCH
:
2852 store_unsigned_integer (buf
, 4, enable
? 1 : 0);
2853 if (target_write_memory (eh_catch_catch_addr
, buf
, 4)) /* FIXME 32x64? */
2855 warning ("Couldn't enable exception catch interception.");
2856 return (struct symtab_and_line
*) -1;
2860 error ("Request to enable unknown or unsupported exception event.");
2863 /* Copy break address into new sal struct, malloc'ing if needed. */
2864 if (!break_callback_sal
)
2866 break_callback_sal
= (struct symtab_and_line
*) xmalloc (sizeof (struct symtab_and_line
));
2868 init_sal (break_callback_sal
);
2869 break_callback_sal
->symtab
= NULL
;
2870 break_callback_sal
->pc
= eh_break_addr
;
2871 break_callback_sal
->line
= 0;
2872 break_callback_sal
->end
= eh_break_addr
;
2874 return break_callback_sal
;
2877 /* Record some information about the current exception event */
2878 static struct exception_event_record current_ex_event
;
2879 /* Convenience struct */
2880 static struct symtab_and_line null_symtab_and_line
=
2883 /* Report current exception event. Returns a pointer to a record
2884 that describes the kind of the event, where it was thrown from,
2885 and where it will be caught. More information may be reported
2887 struct exception_event_record
*
2888 child_get_current_exception_event (void)
2890 CORE_ADDR event_kind
;
2891 CORE_ADDR throw_addr
;
2892 CORE_ADDR catch_addr
;
2893 struct frame_info
*fi
, *curr_frame
;
2896 curr_frame
= get_current_frame ();
2898 return (struct exception_event_record
*) NULL
;
2900 /* Go up one frame to __d_eh_notify_callback, because at the
2901 point when this code is executed, there's garbage in the
2902 arguments of __d_eh_break. */
2903 fi
= find_relative_frame (curr_frame
, &level
);
2905 return (struct exception_event_record
*) NULL
;
2909 /* Read in the arguments */
2910 /* __d_eh_notify_callback() is called with 3 arguments:
2911 1. event kind catch or throw
2912 2. the target address if known
2913 3. a flag -- not sure what this is. pai/1997-07-17 */
2914 event_kind
= read_register (ARG0_REGNUM
);
2915 catch_addr
= read_register (ARG1_REGNUM
);
2917 /* Now go down to a user frame */
2918 /* For a throw, __d_eh_break is called by
2919 __d_eh_notify_callback which is called by
2920 __notify_throw which is called
2922 For a catch, __d_eh_break is called by
2923 __d_eh_notify_callback which is called by
2924 <stackwalking stuff> which is called by
2925 __throw__<stuff> or __rethrow_<stuff> which is called
2927 /* FIXME: Don't use such magic numbers; search for the frames */
2928 level
= (event_kind
== EX_EVENT_THROW
) ? 3 : 4;
2929 fi
= find_relative_frame (curr_frame
, &level
);
2931 return (struct exception_event_record
*) NULL
;
2934 throw_addr
= get_frame_pc (fi
);
2936 /* Go back to original (top) frame */
2937 select_frame (curr_frame
);
2939 current_ex_event
.kind
= (enum exception_event_kind
) event_kind
;
2940 current_ex_event
.throw_sal
= find_pc_line (throw_addr
, 1);
2941 current_ex_event
.catch_sal
= find_pc_line (catch_addr
, 1);
2943 return ¤t_ex_event
;
2946 /* Instead of this nasty cast, add a method pvoid() that prints out a
2947 host VOID data type (remember %p isn't portable). */
2950 hppa_pointer_to_address_hack (void *ptr
)
2952 gdb_assert (sizeof (ptr
) == TYPE_LENGTH (builtin_type_void_data_ptr
));
2953 return POINTER_TO_ADDRESS (builtin_type_void_data_ptr
, &ptr
);
2957 unwind_command (char *exp
, int from_tty
)
2960 struct unwind_table_entry
*u
;
2962 /* If we have an expression, evaluate it and use it as the address. */
2964 if (exp
!= 0 && *exp
!= 0)
2965 address
= parse_and_eval_address (exp
);
2969 u
= find_unwind_entry (address
);
2973 printf_unfiltered ("Can't find unwind table entry for %s\n", exp
);
2977 printf_unfiltered ("unwind_table_entry (0x%s):\n",
2978 paddr_nz (hppa_pointer_to_address_hack (u
)));
2980 printf_unfiltered ("\tregion_start = ");
2981 print_address (u
->region_start
, gdb_stdout
);
2983 printf_unfiltered ("\n\tregion_end = ");
2984 print_address (u
->region_end
, gdb_stdout
);
2986 #define pif(FLD) if (u->FLD) printf_unfiltered (" "#FLD);
2988 printf_unfiltered ("\n\tflags =");
2989 pif (Cannot_unwind
);
2991 pif (Millicode_save_sr0
);
2994 pif (Variable_Frame
);
2995 pif (Separate_Package_Body
);
2996 pif (Frame_Extension_Millicode
);
2997 pif (Stack_Overflow_Check
);
2998 pif (Two_Instruction_SP_Increment
);
3002 pif (Save_MRP_in_frame
);
3003 pif (extn_ptr_defined
);
3004 pif (Cleanup_defined
);
3005 pif (MPE_XL_interrupt_marker
);
3006 pif (HP_UX_interrupt_marker
);
3009 putchar_unfiltered ('\n');
3011 #define pin(FLD) printf_unfiltered ("\t"#FLD" = 0x%x\n", u->FLD);
3013 pin (Region_description
);
3016 pin (Total_frame_size
);
3020 hppa_skip_permanent_breakpoint (void)
3022 /* To step over a breakpoint instruction on the PA takes some
3023 fiddling with the instruction address queue.
3025 When we stop at a breakpoint, the IA queue front (the instruction
3026 we're executing now) points at the breakpoint instruction, and
3027 the IA queue back (the next instruction to execute) points to
3028 whatever instruction we would execute after the breakpoint, if it
3029 were an ordinary instruction. This is the case even if the
3030 breakpoint is in the delay slot of a branch instruction.
3032 Clearly, to step past the breakpoint, we need to set the queue
3033 front to the back. But what do we put in the back? What
3034 instruction comes after that one? Because of the branch delay
3035 slot, the next insn is always at the back + 4. */
3036 write_register (PCOQ_HEAD_REGNUM
, read_register (PCOQ_TAIL_REGNUM
));
3037 write_register (PCSQ_HEAD_REGNUM
, read_register (PCSQ_TAIL_REGNUM
));
3039 write_register (PCOQ_TAIL_REGNUM
, read_register (PCOQ_TAIL_REGNUM
) + 4);
3040 /* We can leave the tail's space the same, since there's no jump. */
3044 hppa_reg_struct_has_addr (int gcc_p
, struct type
*type
)
3046 /* On the PA, any pass-by-value structure > 8 bytes is actually passed
3047 via a pointer regardless of its type or the compiler used. */
3048 return (TYPE_LENGTH (type
) > 8);
3052 hppa_inner_than (CORE_ADDR lhs
, CORE_ADDR rhs
)
3054 /* Stack grows upward */
3059 hppa_pc_requires_run_before_use (CORE_ADDR pc
)
3061 /* Sometimes we may pluck out a minimal symbol that has a negative address.
3063 An example of this occurs when an a.out is linked against a foo.sl.
3064 The foo.sl defines a global bar(), and the a.out declares a signature
3065 for bar(). However, the a.out doesn't directly call bar(), but passes
3066 its address in another call.
3068 If you have this scenario and attempt to "break bar" before running,
3069 gdb will find a minimal symbol for bar() in the a.out. But that
3070 symbol's address will be negative. What this appears to denote is
3071 an index backwards from the base of the procedure linkage table (PLT)
3072 into the data linkage table (DLT), the end of which is contiguous
3073 with the start of the PLT. This is clearly not a valid address for
3074 us to set a breakpoint on.
3076 Note that one must be careful in how one checks for a negative address.
3077 0xc0000000 is a legitimate address of something in a shared text
3078 segment, for example. Since I don't know what the possible range
3079 is of these "really, truly negative" addresses that come from the
3080 minimal symbols, I'm resorting to the gross hack of checking the
3081 top byte of the address for all 1's. Sigh. */
3083 return (!target_has_stack
&& (pc
& 0xFF000000));
3087 hppa_instruction_nullified (void)
3089 /* brobecker 2002/11/07: Couldn't we use a ULONGEST here? It would
3090 avoid the type cast. I'm leaving it as is for now as I'm doing
3091 semi-mechanical multiarching-related changes. */
3092 const int ipsw
= (int) read_register (IPSW_REGNUM
);
3093 const int flags
= (int) read_register (FLAGS_REGNUM
);
3095 return ((ipsw
& 0x00200000) && !(flags
& 0x2));
3098 /* Return the GDB type object for the "standard" data type of data
3101 static struct type
*
3102 hppa32_register_type (struct gdbarch
*gdbarch
, int reg_nr
)
3104 if (reg_nr
< FP4_REGNUM
)
3105 return builtin_type_uint32
;
3107 return builtin_type_ieee_single_big
;
3110 /* Return the GDB type object for the "standard" data type of data
3111 in register N. hppa64 version. */
3113 static struct type
*
3114 hppa64_register_type (struct gdbarch
*gdbarch
, int reg_nr
)
3116 if (reg_nr
< FP4_REGNUM
)
3117 return builtin_type_uint64
;
3119 return builtin_type_ieee_double_big
;
3122 /* Return True if REGNUM is not a register available to the user
3123 through ptrace(). */
3126 hppa_cannot_store_register (int regnum
)
3129 || regnum
== PCSQ_HEAD_REGNUM
3130 || (regnum
>= PCSQ_TAIL_REGNUM
&& regnum
< IPSW_REGNUM
)
3131 || (regnum
> IPSW_REGNUM
&& regnum
< FP4_REGNUM
));
3136 hppa_smash_text_address (CORE_ADDR addr
)
3138 /* The low two bits of the PC on the PA contain the privilege level.
3139 Some genius implementing a (non-GCC) compiler apparently decided
3140 this means that "addresses" in a text section therefore include a
3141 privilege level, and thus symbol tables should contain these bits.
3142 This seems like a bonehead thing to do--anyway, it seems to work
3143 for our purposes to just ignore those bits. */
3145 return (addr
&= ~0x3);
3148 /* Get the ith function argument for the current function. */
3150 hppa_fetch_pointer_argument (struct frame_info
*frame
, int argi
,
3154 get_frame_register (frame
, R0_REGNUM
+ 26 - argi
, &addr
);
3158 /* Here is a table of C type sizes on hppa with various compiles
3159 and options. I measured this on PA 9000/800 with HP-UX 11.11
3160 and these compilers:
3162 /usr/ccs/bin/cc HP92453-01 A.11.01.21
3163 /opt/ansic/bin/cc HP92453-01 B.11.11.28706.GP
3164 /opt/aCC/bin/aCC B3910B A.03.45
3165 gcc gcc 3.3.2 native hppa2.0w-hp-hpux11.11
3167 cc : 1 2 4 4 8 : 4 8 -- : 4 4
3168 ansic +DA1.1 : 1 2 4 4 8 : 4 8 16 : 4 4
3169 ansic +DA2.0 : 1 2 4 4 8 : 4 8 16 : 4 4
3170 ansic +DA2.0W : 1 2 4 8 8 : 4 8 16 : 8 8
3171 acc +DA1.1 : 1 2 4 4 8 : 4 8 16 : 4 4
3172 acc +DA2.0 : 1 2 4 4 8 : 4 8 16 : 4 4
3173 acc +DA2.0W : 1 2 4 8 8 : 4 8 16 : 8 8
3174 gcc : 1 2 4 4 8 : 4 8 16 : 4 4
3178 compiler and options
3179 char, short, int, long, long long
3180 float, double, long double
3183 So all these compilers use either ILP32 or LP64 model.
3184 TODO: gcc has more options so it needs more investigation.
3186 For floating point types, see:
3188 http://docs.hp.com/hpux/pdf/B3906-90006.pdf
3189 HP-UX floating-point guide, hpux 11.00
3191 -- chastain 2003-12-18 */
3193 static struct gdbarch
*
3194 hppa_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
3196 struct gdbarch_tdep
*tdep
;
3197 struct gdbarch
*gdbarch
;
3199 /* Try to determine the ABI of the object we are loading. */
3200 if (info
.abfd
!= NULL
&& info
.osabi
== GDB_OSABI_UNKNOWN
)
3202 /* If it's a SOM file, assume it's HP/UX SOM. */
3203 if (bfd_get_flavour (info
.abfd
) == bfd_target_som_flavour
)
3204 info
.osabi
= GDB_OSABI_HPUX_SOM
;
3207 /* find a candidate among the list of pre-declared architectures. */
3208 arches
= gdbarch_list_lookup_by_info (arches
, &info
);
3210 return (arches
->gdbarch
);
3212 /* If none found, then allocate and initialize one. */
3213 tdep
= XMALLOC (struct gdbarch_tdep
);
3214 gdbarch
= gdbarch_alloc (&info
, tdep
);
3216 /* Determine from the bfd_arch_info structure if we are dealing with
3217 a 32 or 64 bits architecture. If the bfd_arch_info is not available,
3218 then default to a 32bit machine. */
3219 if (info
.bfd_arch_info
!= NULL
)
3220 tdep
->bytes_per_address
=
3221 info
.bfd_arch_info
->bits_per_address
/ info
.bfd_arch_info
->bits_per_byte
;
3223 tdep
->bytes_per_address
= 4;
3225 /* Some parts of the gdbarch vector depend on whether we are running
3226 on a 32 bits or 64 bits target. */
3227 switch (tdep
->bytes_per_address
)
3230 set_gdbarch_num_regs (gdbarch
, hppa32_num_regs
);
3231 set_gdbarch_register_name (gdbarch
, hppa32_register_name
);
3232 set_gdbarch_register_type (gdbarch
, hppa32_register_type
);
3235 set_gdbarch_num_regs (gdbarch
, hppa64_num_regs
);
3236 set_gdbarch_register_name (gdbarch
, hppa64_register_name
);
3237 set_gdbarch_register_type (gdbarch
, hppa64_register_type
);
3240 internal_error (__FILE__
, __LINE__
, "Unsupported address size: %d",
3241 tdep
->bytes_per_address
);
3244 set_gdbarch_long_bit (gdbarch
, tdep
->bytes_per_address
* TARGET_CHAR_BIT
);
3245 set_gdbarch_ptr_bit (gdbarch
, tdep
->bytes_per_address
* TARGET_CHAR_BIT
);
3247 /* The following gdbarch vector elements are the same in both ILP32
3248 and LP64, but might show differences some day. */
3249 set_gdbarch_long_long_bit (gdbarch
, 64);
3250 set_gdbarch_long_double_bit (gdbarch
, 128);
3251 set_gdbarch_long_double_format (gdbarch
, &floatformat_ia64_quad_big
);
3253 /* The following gdbarch vector elements do not depend on the address
3254 size, or in any other gdbarch element previously set. */
3255 set_gdbarch_skip_prologue (gdbarch
, hppa_skip_prologue
);
3256 set_gdbarch_skip_trampoline_code (gdbarch
, hppa_skip_trampoline_code
);
3257 set_gdbarch_in_solib_call_trampoline (gdbarch
, hppa_in_solib_call_trampoline
);
3258 set_gdbarch_in_solib_return_trampoline (gdbarch
,
3259 hppa_in_solib_return_trampoline
);
3260 set_gdbarch_inner_than (gdbarch
, hppa_inner_than
);
3261 set_gdbarch_sp_regnum (gdbarch
, HPPA_SP_REGNUM
);
3262 set_gdbarch_fp0_regnum (gdbarch
, HPPA_FP0_REGNUM
);
3263 set_gdbarch_cannot_store_register (gdbarch
, hppa_cannot_store_register
);
3264 set_gdbarch_addr_bits_remove (gdbarch
, hppa_smash_text_address
);
3265 set_gdbarch_smash_text_address (gdbarch
, hppa_smash_text_address
);
3266 set_gdbarch_believe_pcc_promotion (gdbarch
, 1);
3267 set_gdbarch_read_pc (gdbarch
, hppa_target_read_pc
);
3268 set_gdbarch_write_pc (gdbarch
, hppa_target_write_pc
);
3270 /* Helper for function argument information. */
3271 set_gdbarch_fetch_pointer_argument (gdbarch
, hppa_fetch_pointer_argument
);
3273 set_gdbarch_print_insn (gdbarch
, print_insn_hppa
);
3275 /* When a hardware watchpoint triggers, we'll move the inferior past
3276 it by removing all eventpoints; stepping past the instruction
3277 that caused the trigger; reinserting eventpoints; and checking
3278 whether any watched location changed. */
3279 set_gdbarch_have_nonsteppable_watchpoint (gdbarch
, 1);
3281 /* Inferior function call methods. */
3282 switch (tdep
->bytes_per_address
)
3285 set_gdbarch_push_dummy_call (gdbarch
, hppa32_push_dummy_call
);
3286 set_gdbarch_frame_align (gdbarch
, hppa32_frame_align
);
3289 set_gdbarch_push_dummy_call (gdbarch
, hppa64_push_dummy_call
);
3290 set_gdbarch_frame_align (gdbarch
, hppa64_frame_align
);
3293 internal_error (__FILE__
, __LINE__
, "bad switch");
3296 /* Struct return methods. */
3297 switch (tdep
->bytes_per_address
)
3300 set_gdbarch_return_value (gdbarch
, hppa32_return_value
);
3303 set_gdbarch_return_value (gdbarch
, hppa64_return_value
);
3306 internal_error (__FILE__
, __LINE__
, "bad switch");
3309 /* Frame unwind methods. */
3310 set_gdbarch_unwind_dummy_id (gdbarch
, hppa_unwind_dummy_id
);
3311 set_gdbarch_unwind_pc (gdbarch
, hppa_unwind_pc
);
3312 frame_unwind_append_sniffer (gdbarch
, hppa_frame_unwind_sniffer
);
3313 frame_base_append_sniffer (gdbarch
, hppa_frame_base_sniffer
);
3315 /* Hook in ABI-specific overrides, if they have been registered. */
3316 gdbarch_init_osabi (info
, gdbarch
);
3322 hppa_dump_tdep (struct gdbarch
*current_gdbarch
, struct ui_file
*file
)
3324 /* Nothing to print for the moment. */
3328 _initialize_hppa_tdep (void)
3330 struct cmd_list_element
*c
;
3331 void break_at_finish_command (char *arg
, int from_tty
);
3332 void tbreak_at_finish_command (char *arg
, int from_tty
);
3333 void break_at_finish_at_depth_command (char *arg
, int from_tty
);
3335 gdbarch_register (bfd_arch_hppa
, hppa_gdbarch_init
, hppa_dump_tdep
);
3337 add_cmd ("unwind", class_maintenance
, unwind_command
,
3338 "Print unwind table entry at given address.",
3339 &maintenanceprintlist
);
3341 deprecate_cmd (add_com ("xbreak", class_breakpoint
,
3342 break_at_finish_command
,
3343 concat ("Set breakpoint at procedure exit. \n\
3344 Argument may be function name, or \"*\" and an address.\n\
3345 If function is specified, break at end of code for that function.\n\
3346 If an address is specified, break at the end of the function that contains \n\
3347 that exact address.\n",
3348 "With no arg, uses current execution address of selected stack frame.\n\
3349 This is useful for breaking on return to a stack frame.\n\
3351 Multiple breakpoints at one place are permitted, and useful if conditional.\n\
3353 Do \"help breakpoints\" for info on other commands dealing with breakpoints.", NULL
)), NULL
);
3354 deprecate_cmd (add_com_alias ("xb", "xbreak", class_breakpoint
, 1), NULL
);
3355 deprecate_cmd (add_com_alias ("xbr", "xbreak", class_breakpoint
, 1), NULL
);
3356 deprecate_cmd (add_com_alias ("xbre", "xbreak", class_breakpoint
, 1), NULL
);
3357 deprecate_cmd (add_com_alias ("xbrea", "xbreak", class_breakpoint
, 1), NULL
);
3359 deprecate_cmd (c
= add_com ("txbreak", class_breakpoint
,
3360 tbreak_at_finish_command
,
3361 "Set temporary breakpoint at procedure exit. Either there should\n\
3362 be no argument or the argument must be a depth.\n"), NULL
);
3363 set_cmd_completer (c
, location_completer
);
3366 deprecate_cmd (add_com ("bx", class_breakpoint
,
3367 break_at_finish_at_depth_command
,
3368 "Set breakpoint at procedure exit. Either there should\n\
3369 be no argument or the argument must be a depth.\n"), NULL
);