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 static const int hppa64_call_dummy_breakpoint_offset
= 22 * 4;
81 /* DEPRECATED_CALL_DUMMY_LENGTH is computed based on the size of a
82 word on the target machine, not the size of an instruction. Since
83 a word on this target holds two instructions we have to divide the
84 instruction size by two to get the word size of the dummy. */
85 static const int hppa32_call_dummy_length
= INSTRUCTION_SIZE
* 28;
86 static const int hppa64_call_dummy_length
= INSTRUCTION_SIZE
* 26 / 2;
88 /* Get at various relevent fields of an instruction word. */
91 #define MASK_14 0x3fff
92 #define MASK_21 0x1fffff
94 /* Define offsets into the call dummy for the target function address.
95 See comments related to CALL_DUMMY for more info. */
96 #define FUNC_LDIL_OFFSET (INSTRUCTION_SIZE * 9)
97 #define FUNC_LDO_OFFSET (INSTRUCTION_SIZE * 10)
99 /* Define offsets into the call dummy for the _sr4export address.
100 See comments related to CALL_DUMMY for more info. */
101 #define SR4EXPORT_LDIL_OFFSET (INSTRUCTION_SIZE * 12)
102 #define SR4EXPORT_LDO_OFFSET (INSTRUCTION_SIZE * 13)
104 /* To support detection of the pseudo-initial frame
105 that threads have. */
106 #define THREAD_INITIAL_FRAME_SYMBOL "__pthread_exit"
107 #define THREAD_INITIAL_FRAME_SYM_LEN sizeof(THREAD_INITIAL_FRAME_SYMBOL)
109 /* Sizes (in bytes) of the native unwind entries. */
110 #define UNWIND_ENTRY_SIZE 16
111 #define STUB_UNWIND_ENTRY_SIZE 8
113 static int get_field (unsigned word
, int from
, int to
);
115 static int extract_5_load (unsigned int);
117 static unsigned extract_5R_store (unsigned int);
119 static unsigned extract_5r_store (unsigned int);
121 static void hppa_frame_init_saved_regs (struct frame_info
*frame
);
123 static void find_dummy_frame_regs (struct frame_info
*, CORE_ADDR
*);
125 static int find_proc_framesize (CORE_ADDR
);
127 static int find_return_regnum (CORE_ADDR
);
129 struct unwind_table_entry
*find_unwind_entry (CORE_ADDR
);
131 static int extract_17 (unsigned int);
133 static unsigned deposit_21 (unsigned int, unsigned int);
135 static int extract_21 (unsigned);
137 static unsigned deposit_14 (int, unsigned int);
139 static int extract_14 (unsigned);
141 static void unwind_command (char *, int);
143 static int low_sign_extend (unsigned int, unsigned int);
145 static int sign_extend (unsigned int, unsigned int);
147 static int restore_pc_queue (CORE_ADDR
*);
149 static int hppa_alignof (struct type
*);
151 static int prologue_inst_adjust_sp (unsigned long);
153 static int is_branch (unsigned long);
155 static int inst_saves_gr (unsigned long);
157 static int inst_saves_fr (unsigned long);
159 static int pc_in_interrupt_handler (CORE_ADDR
);
161 static int pc_in_linker_stub (CORE_ADDR
);
163 static int compare_unwind_entries (const void *, const void *);
165 static void read_unwind_info (struct objfile
*);
167 static void internalize_unwinds (struct objfile
*,
168 struct unwind_table_entry
*,
169 asection
*, unsigned int,
170 unsigned int, CORE_ADDR
);
171 static void pa_print_registers (char *, int, int);
172 static void pa_strcat_registers (char *, int, int, struct ui_file
*);
173 static void pa_register_look_aside (char *, int, long *);
174 static void pa_print_fp_reg (int);
175 static void pa_strcat_fp_reg (int, struct ui_file
*, enum precision_type
);
176 static void record_text_segment_lowaddr (bfd
*, asection
*, void *);
177 /* FIXME: brobecker 2002-11-07: We will likely be able to make the
178 following functions static, once we hppa is partially multiarched. */
179 int hppa_reg_struct_has_addr (int gcc_p
, struct type
*type
);
180 CORE_ADDR
hppa_skip_prologue (CORE_ADDR pc
);
181 CORE_ADDR
hppa_skip_trampoline_code (CORE_ADDR pc
);
182 int hppa_in_solib_call_trampoline (CORE_ADDR pc
, char *name
);
183 int hppa_in_solib_return_trampoline (CORE_ADDR pc
, char *name
);
184 CORE_ADDR
hppa_saved_pc_after_call (struct frame_info
*frame
);
185 int hppa_inner_than (CORE_ADDR lhs
, CORE_ADDR rhs
);
186 CORE_ADDR
hppa32_stack_align (CORE_ADDR sp
);
187 CORE_ADDR
hppa64_stack_align (CORE_ADDR sp
);
188 int hppa_pc_requires_run_before_use (CORE_ADDR pc
);
189 int hppa_instruction_nullified (void);
190 int hppa_register_raw_size (int reg_nr
);
191 int hppa_register_byte (int reg_nr
);
192 struct type
* hppa32_register_virtual_type (int reg_nr
);
193 struct type
* hppa64_register_virtual_type (int reg_nr
);
194 void hppa_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
);
195 void hppa32_extract_return_value (struct type
*type
, char *regbuf
,
197 void hppa64_extract_return_value (struct type
*type
, char *regbuf
,
199 int hppa32_use_struct_convention (int gcc_p
, struct type
*type
);
200 int hppa64_use_struct_convention (int gcc_p
, struct type
*type
);
201 void hppa32_store_return_value (struct type
*type
, char *valbuf
);
202 void hppa64_store_return_value (struct type
*type
, char *valbuf
);
203 int hppa_cannot_store_register (int regnum
);
204 void hppa_init_extra_frame_info (int fromleaf
, struct frame_info
*frame
);
205 CORE_ADDR
hppa_frame_chain (struct frame_info
*frame
);
206 int hppa_frame_chain_valid (CORE_ADDR chain
, struct frame_info
*thisframe
);
207 int hppa_frameless_function_invocation (struct frame_info
*frame
);
208 CORE_ADDR
hppa_frame_saved_pc (struct frame_info
*frame
);
209 CORE_ADDR
hppa_frame_args_address (struct frame_info
*fi
);
210 int hppa_frame_num_args (struct frame_info
*frame
);
211 void hppa_push_dummy_frame (void);
212 void hppa_pop_frame (void);
213 CORE_ADDR
hppa_fix_call_dummy (char *dummy
, CORE_ADDR pc
, CORE_ADDR fun
,
214 int nargs
, struct value
**args
,
215 struct type
*type
, int gcc_p
);
216 CORE_ADDR
hppa_push_arguments (int nargs
, struct value
**args
, CORE_ADDR sp
,
217 int struct_return
, CORE_ADDR struct_addr
);
218 CORE_ADDR
hppa_smash_text_address (CORE_ADDR addr
);
219 CORE_ADDR
hppa_target_read_pc (ptid_t ptid
);
220 void hppa_target_write_pc (CORE_ADDR v
, ptid_t ptid
);
221 CORE_ADDR
hppa_target_read_fp (void);
225 struct minimal_symbol
*msym
;
226 CORE_ADDR solib_handle
;
227 CORE_ADDR return_val
;
231 static int cover_find_stub_with_shl_get (void *);
233 static int is_pa_2
= 0; /* False */
235 /* This is declared in symtab.c; set to 1 in hp-symtab-read.c */
236 extern int hp_som_som_object_present
;
238 /* In breakpoint.c */
239 extern int exception_catchpoints_are_fragile
;
241 /* Should call_function allocate stack space for a struct return? */
244 hppa32_use_struct_convention (int gcc_p
, struct type
*type
)
246 return (TYPE_LENGTH (type
) > 2 * DEPRECATED_REGISTER_SIZE
);
249 /* Same as hppa32_use_struct_convention() for the PA64 ABI. */
252 hppa64_use_struct_convention (int gcc_p
, struct type
*type
)
254 /* RM: struct upto 128 bits are returned in registers */
255 return TYPE_LENGTH (type
) > 16;
258 /* Handle 32/64-bit struct return conventions. */
260 static enum return_value_convention
261 hppa32_return_value (struct gdbarch
*gdbarch
,
262 struct type
*type
, struct regcache
*regcache
,
263 void *readbuf
, const void *writebuf
)
265 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
268 regcache_cooked_read_part (regcache
, FP4_REGNUM
, 0,
269 TYPE_LENGTH (type
), readbuf
);
270 if (writebuf
!= NULL
)
271 regcache_cooked_write_part (regcache
, FP4_REGNUM
, 0,
272 TYPE_LENGTH (type
), writebuf
);
273 return RETURN_VALUE_REGISTER_CONVENTION
;
275 if (TYPE_LENGTH (type
) <= 2 * 4)
277 /* The value always lives in the right hand end of the register
278 (or register pair)? */
281 int part
= TYPE_LENGTH (type
) % 4;
282 /* The left hand register contains only part of the value,
283 transfer that first so that the rest can be xfered as entire
288 regcache_cooked_read_part (regcache
, reg
, 4 - part
,
290 if (writebuf
!= NULL
)
291 regcache_cooked_write_part (regcache
, reg
, 4 - part
,
295 /* Now transfer the remaining register values. */
296 for (b
= part
; b
< TYPE_LENGTH (type
); b
+= 4)
299 regcache_cooked_read (regcache
, reg
, (char *) readbuf
+ b
);
300 if (writebuf
!= NULL
)
301 regcache_cooked_write (regcache
, reg
, (const char *) writebuf
+ b
);
304 return RETURN_VALUE_REGISTER_CONVENTION
;
307 return RETURN_VALUE_STRUCT_CONVENTION
;
310 static enum return_value_convention
311 hppa64_return_value (struct gdbarch
*gdbarch
,
312 struct type
*type
, struct regcache
*regcache
,
313 void *readbuf
, const void *writebuf
)
315 /* RM: Floats are returned in FR4R, doubles in FR4. Integral values
316 are in r28, padded on the left. Aggregates less that 65 bits are
317 in r28, right padded. Aggregates upto 128 bits are in r28 and
318 r29, right padded. */
319 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
321 /* Floats are right aligned? */
322 int offset
= register_size (gdbarch
, FP4_REGNUM
) - TYPE_LENGTH (type
);
324 regcache_cooked_read_part (regcache
, FP4_REGNUM
, offset
,
325 TYPE_LENGTH (type
), readbuf
);
326 if (writebuf
!= NULL
)
327 regcache_cooked_write_part (regcache
, FP4_REGNUM
, offset
,
328 TYPE_LENGTH (type
), writebuf
);
329 return RETURN_VALUE_REGISTER_CONVENTION
;
331 else if (TYPE_LENGTH (type
) <= 8 && is_integral_type (type
))
333 /* Integrals are right aligned. */
334 int offset
= register_size (gdbarch
, FP4_REGNUM
) - TYPE_LENGTH (type
);
336 regcache_cooked_read_part (regcache
, 28, offset
,
337 TYPE_LENGTH (type
), readbuf
);
338 if (writebuf
!= NULL
)
339 regcache_cooked_write_part (regcache
, 28, offset
,
340 TYPE_LENGTH (type
), writebuf
);
341 return RETURN_VALUE_REGISTER_CONVENTION
;
343 else if (TYPE_LENGTH (type
) <= 2 * 8)
345 /* Composite values are left aligned. */
347 for (b
= 0; b
< TYPE_LENGTH (type
); b
+= 8)
349 int part
= (TYPE_LENGTH (type
) - b
- 1) % 8 + 1;
351 regcache_cooked_read_part (regcache
, 28, 0, part
,
352 (char *) readbuf
+ b
);
353 if (writebuf
!= NULL
)
354 regcache_cooked_write_part (regcache
, 28, 0, part
,
355 (const char *) writebuf
+ b
);
357 return RETURN_VALUE_REGISTER_CONVENTION
;
360 return RETURN_VALUE_STRUCT_CONVENTION
;
363 /* Routines to extract various sized constants out of hppa
366 /* This assumes that no garbage lies outside of the lower bits of
370 sign_extend (unsigned val
, unsigned bits
)
372 return (int) (val
>> (bits
- 1) ? (-1 << bits
) | val
: val
);
375 /* For many immediate values the sign bit is the low bit! */
378 low_sign_extend (unsigned val
, unsigned bits
)
380 return (int) ((val
& 0x1 ? (-1 << (bits
- 1)) : 0) | val
>> 1);
383 /* Extract the bits at positions between FROM and TO, using HP's numbering
387 get_field (unsigned word
, int from
, int to
)
389 return ((word
) >> (31 - (to
)) & ((1 << ((to
) - (from
) + 1)) - 1));
392 /* extract the immediate field from a ld{bhw}s instruction */
395 extract_5_load (unsigned word
)
397 return low_sign_extend (word
>> 16 & MASK_5
, 5);
400 /* extract the immediate field from a break instruction */
403 extract_5r_store (unsigned word
)
405 return (word
& MASK_5
);
408 /* extract the immediate field from a {sr}sm instruction */
411 extract_5R_store (unsigned word
)
413 return (word
>> 16 & MASK_5
);
416 /* extract a 14 bit immediate field */
419 extract_14 (unsigned word
)
421 return low_sign_extend (word
& MASK_14
, 14);
424 /* deposit a 14 bit constant in a word */
427 deposit_14 (int opnd
, unsigned word
)
429 unsigned sign
= (opnd
< 0 ? 1 : 0);
431 return word
| ((unsigned) opnd
<< 1 & MASK_14
) | sign
;
434 /* extract a 21 bit constant */
437 extract_21 (unsigned word
)
443 val
= get_field (word
, 20, 20);
445 val
|= get_field (word
, 9, 19);
447 val
|= get_field (word
, 5, 6);
449 val
|= get_field (word
, 0, 4);
451 val
|= get_field (word
, 7, 8);
452 return sign_extend (val
, 21) << 11;
455 /* deposit a 21 bit constant in a word. Although 21 bit constants are
456 usually the top 21 bits of a 32 bit constant, we assume that only
457 the low 21 bits of opnd are relevant */
460 deposit_21 (unsigned opnd
, unsigned word
)
464 val
|= get_field (opnd
, 11 + 14, 11 + 18);
466 val
|= get_field (opnd
, 11 + 12, 11 + 13);
468 val
|= get_field (opnd
, 11 + 19, 11 + 20);
470 val
|= get_field (opnd
, 11 + 1, 11 + 11);
472 val
|= get_field (opnd
, 11 + 0, 11 + 0);
476 /* extract a 17 bit constant from branch instructions, returning the
477 19 bit signed value. */
480 extract_17 (unsigned word
)
482 return sign_extend (get_field (word
, 19, 28) |
483 get_field (word
, 29, 29) << 10 |
484 get_field (word
, 11, 15) << 11 |
485 (word
& 0x1) << 16, 17) << 2;
489 /* Compare the start address for two unwind entries returning 1 if
490 the first address is larger than the second, -1 if the second is
491 larger than the first, and zero if they are equal. */
494 compare_unwind_entries (const void *arg1
, const void *arg2
)
496 const struct unwind_table_entry
*a
= arg1
;
497 const struct unwind_table_entry
*b
= arg2
;
499 if (a
->region_start
> b
->region_start
)
501 else if (a
->region_start
< b
->region_start
)
507 static CORE_ADDR low_text_segment_address
;
510 record_text_segment_lowaddr (bfd
*abfd
, asection
*section
, void *ignored
)
512 if (((section
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
))
513 == (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
))
514 && section
->vma
< low_text_segment_address
)
515 low_text_segment_address
= section
->vma
;
519 internalize_unwinds (struct objfile
*objfile
, struct unwind_table_entry
*table
,
520 asection
*section
, unsigned int entries
, unsigned int size
,
521 CORE_ADDR text_offset
)
523 /* We will read the unwind entries into temporary memory, then
524 fill in the actual unwind table. */
529 char *buf
= alloca (size
);
531 low_text_segment_address
= -1;
533 /* If addresses are 64 bits wide, then unwinds are supposed to
534 be segment relative offsets instead of absolute addresses.
536 Note that when loading a shared library (text_offset != 0) the
537 unwinds are already relative to the text_offset that will be
539 if (TARGET_PTR_BIT
== 64 && text_offset
== 0)
541 bfd_map_over_sections (objfile
->obfd
,
542 record_text_segment_lowaddr
, NULL
);
544 /* ?!? Mask off some low bits. Should this instead subtract
545 out the lowest section's filepos or something like that?
546 This looks very hokey to me. */
547 low_text_segment_address
&= ~0xfff;
548 text_offset
+= low_text_segment_address
;
551 bfd_get_section_contents (objfile
->obfd
, section
, buf
, 0, size
);
553 /* Now internalize the information being careful to handle host/target
555 for (i
= 0; i
< entries
; i
++)
557 table
[i
].region_start
= bfd_get_32 (objfile
->obfd
,
559 table
[i
].region_start
+= text_offset
;
561 table
[i
].region_end
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) buf
);
562 table
[i
].region_end
+= text_offset
;
564 tmp
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) buf
);
566 table
[i
].Cannot_unwind
= (tmp
>> 31) & 0x1;
567 table
[i
].Millicode
= (tmp
>> 30) & 0x1;
568 table
[i
].Millicode_save_sr0
= (tmp
>> 29) & 0x1;
569 table
[i
].Region_description
= (tmp
>> 27) & 0x3;
570 table
[i
].reserved1
= (tmp
>> 26) & 0x1;
571 table
[i
].Entry_SR
= (tmp
>> 25) & 0x1;
572 table
[i
].Entry_FR
= (tmp
>> 21) & 0xf;
573 table
[i
].Entry_GR
= (tmp
>> 16) & 0x1f;
574 table
[i
].Args_stored
= (tmp
>> 15) & 0x1;
575 table
[i
].Variable_Frame
= (tmp
>> 14) & 0x1;
576 table
[i
].Separate_Package_Body
= (tmp
>> 13) & 0x1;
577 table
[i
].Frame_Extension_Millicode
= (tmp
>> 12) & 0x1;
578 table
[i
].Stack_Overflow_Check
= (tmp
>> 11) & 0x1;
579 table
[i
].Two_Instruction_SP_Increment
= (tmp
>> 10) & 0x1;
580 table
[i
].Ada_Region
= (tmp
>> 9) & 0x1;
581 table
[i
].cxx_info
= (tmp
>> 8) & 0x1;
582 table
[i
].cxx_try_catch
= (tmp
>> 7) & 0x1;
583 table
[i
].sched_entry_seq
= (tmp
>> 6) & 0x1;
584 table
[i
].reserved2
= (tmp
>> 5) & 0x1;
585 table
[i
].Save_SP
= (tmp
>> 4) & 0x1;
586 table
[i
].Save_RP
= (tmp
>> 3) & 0x1;
587 table
[i
].Save_MRP_in_frame
= (tmp
>> 2) & 0x1;
588 table
[i
].extn_ptr_defined
= (tmp
>> 1) & 0x1;
589 table
[i
].Cleanup_defined
= tmp
& 0x1;
590 tmp
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) buf
);
592 table
[i
].MPE_XL_interrupt_marker
= (tmp
>> 31) & 0x1;
593 table
[i
].HP_UX_interrupt_marker
= (tmp
>> 30) & 0x1;
594 table
[i
].Large_frame
= (tmp
>> 29) & 0x1;
595 table
[i
].Pseudo_SP_Set
= (tmp
>> 28) & 0x1;
596 table
[i
].reserved4
= (tmp
>> 27) & 0x1;
597 table
[i
].Total_frame_size
= tmp
& 0x7ffffff;
599 /* Stub unwinds are handled elsewhere. */
600 table
[i
].stub_unwind
.stub_type
= 0;
601 table
[i
].stub_unwind
.padding
= 0;
606 /* Read in the backtrace information stored in the `$UNWIND_START$' section of
607 the object file. This info is used mainly by find_unwind_entry() to find
608 out the stack frame size and frame pointer used by procedures. We put
609 everything on the psymbol obstack in the objfile so that it automatically
610 gets freed when the objfile is destroyed. */
613 read_unwind_info (struct objfile
*objfile
)
615 asection
*unwind_sec
, *stub_unwind_sec
;
616 unsigned unwind_size
, stub_unwind_size
, total_size
;
617 unsigned index
, unwind_entries
;
618 unsigned stub_entries
, total_entries
;
619 CORE_ADDR text_offset
;
620 struct obj_unwind_info
*ui
;
621 obj_private_data_t
*obj_private
;
623 text_offset
= ANOFFSET (objfile
->section_offsets
, 0);
624 ui
= (struct obj_unwind_info
*) obstack_alloc (&objfile
->objfile_obstack
,
625 sizeof (struct obj_unwind_info
));
631 /* For reasons unknown the HP PA64 tools generate multiple unwinder
632 sections in a single executable. So we just iterate over every
633 section in the BFD looking for unwinder sections intead of trying
634 to do a lookup with bfd_get_section_by_name.
636 First determine the total size of the unwind tables so that we
637 can allocate memory in a nice big hunk. */
639 for (unwind_sec
= objfile
->obfd
->sections
;
641 unwind_sec
= unwind_sec
->next
)
643 if (strcmp (unwind_sec
->name
, "$UNWIND_START$") == 0
644 || strcmp (unwind_sec
->name
, ".PARISC.unwind") == 0)
646 unwind_size
= bfd_section_size (objfile
->obfd
, unwind_sec
);
647 unwind_entries
= unwind_size
/ UNWIND_ENTRY_SIZE
;
649 total_entries
+= unwind_entries
;
653 /* Now compute the size of the stub unwinds. Note the ELF tools do not
654 use stub unwinds at the curren time. */
655 stub_unwind_sec
= bfd_get_section_by_name (objfile
->obfd
, "$UNWIND_END$");
659 stub_unwind_size
= bfd_section_size (objfile
->obfd
, stub_unwind_sec
);
660 stub_entries
= stub_unwind_size
/ STUB_UNWIND_ENTRY_SIZE
;
664 stub_unwind_size
= 0;
668 /* Compute total number of unwind entries and their total size. */
669 total_entries
+= stub_entries
;
670 total_size
= total_entries
* sizeof (struct unwind_table_entry
);
672 /* Allocate memory for the unwind table. */
673 ui
->table
= (struct unwind_table_entry
*)
674 obstack_alloc (&objfile
->objfile_obstack
, total_size
);
675 ui
->last
= total_entries
- 1;
677 /* Now read in each unwind section and internalize the standard unwind
680 for (unwind_sec
= objfile
->obfd
->sections
;
682 unwind_sec
= unwind_sec
->next
)
684 if (strcmp (unwind_sec
->name
, "$UNWIND_START$") == 0
685 || strcmp (unwind_sec
->name
, ".PARISC.unwind") == 0)
687 unwind_size
= bfd_section_size (objfile
->obfd
, unwind_sec
);
688 unwind_entries
= unwind_size
/ UNWIND_ENTRY_SIZE
;
690 internalize_unwinds (objfile
, &ui
->table
[index
], unwind_sec
,
691 unwind_entries
, unwind_size
, text_offset
);
692 index
+= unwind_entries
;
696 /* Now read in and internalize the stub unwind entries. */
697 if (stub_unwind_size
> 0)
700 char *buf
= alloca (stub_unwind_size
);
702 /* Read in the stub unwind entries. */
703 bfd_get_section_contents (objfile
->obfd
, stub_unwind_sec
, buf
,
704 0, stub_unwind_size
);
706 /* Now convert them into regular unwind entries. */
707 for (i
= 0; i
< stub_entries
; i
++, index
++)
709 /* Clear out the next unwind entry. */
710 memset (&ui
->table
[index
], 0, sizeof (struct unwind_table_entry
));
712 /* Convert offset & size into region_start and region_end.
713 Stuff away the stub type into "reserved" fields. */
714 ui
->table
[index
].region_start
= bfd_get_32 (objfile
->obfd
,
716 ui
->table
[index
].region_start
+= text_offset
;
718 ui
->table
[index
].stub_unwind
.stub_type
= bfd_get_8 (objfile
->obfd
,
721 ui
->table
[index
].region_end
722 = ui
->table
[index
].region_start
+ 4 *
723 (bfd_get_16 (objfile
->obfd
, (bfd_byte
*) buf
) - 1);
729 /* Unwind table needs to be kept sorted. */
730 qsort (ui
->table
, total_entries
, sizeof (struct unwind_table_entry
),
731 compare_unwind_entries
);
733 /* Keep a pointer to the unwind information. */
734 if (objfile
->obj_private
== NULL
)
736 obj_private
= (obj_private_data_t
*)
737 obstack_alloc (&objfile
->objfile_obstack
,
738 sizeof (obj_private_data_t
));
739 obj_private
->unwind_info
= NULL
;
740 obj_private
->so_info
= NULL
;
743 objfile
->obj_private
= obj_private
;
745 obj_private
= (obj_private_data_t
*) objfile
->obj_private
;
746 obj_private
->unwind_info
= ui
;
749 /* Lookup the unwind (stack backtrace) info for the given PC. We search all
750 of the objfiles seeking the unwind table entry for this PC. Each objfile
751 contains a sorted list of struct unwind_table_entry. Since we do a binary
752 search of the unwind tables, we depend upon them to be sorted. */
754 struct unwind_table_entry
*
755 find_unwind_entry (CORE_ADDR pc
)
757 int first
, middle
, last
;
758 struct objfile
*objfile
;
760 /* A function at address 0? Not in HP-UX! */
761 if (pc
== (CORE_ADDR
) 0)
764 ALL_OBJFILES (objfile
)
766 struct obj_unwind_info
*ui
;
768 if (objfile
->obj_private
)
769 ui
= ((obj_private_data_t
*) (objfile
->obj_private
))->unwind_info
;
773 read_unwind_info (objfile
);
774 if (objfile
->obj_private
== NULL
)
775 error ("Internal error reading unwind information.");
776 ui
= ((obj_private_data_t
*) (objfile
->obj_private
))->unwind_info
;
779 /* First, check the cache */
782 && pc
>= ui
->cache
->region_start
783 && pc
<= ui
->cache
->region_end
)
786 /* Not in the cache, do a binary search */
791 while (first
<= last
)
793 middle
= (first
+ last
) / 2;
794 if (pc
>= ui
->table
[middle
].region_start
795 && pc
<= ui
->table
[middle
].region_end
)
797 ui
->cache
= &ui
->table
[middle
];
798 return &ui
->table
[middle
];
801 if (pc
< ui
->table
[middle
].region_start
)
806 } /* ALL_OBJFILES() */
810 const unsigned char *
811 hppa_breakpoint_from_pc (CORE_ADDR
*pc
, int *len
)
813 static const unsigned char breakpoint
[] = {0x00, 0x01, 0x00, 0x04};
814 (*len
) = sizeof (breakpoint
);
818 /* Return the name of a register. */
821 hppa32_register_name (int i
)
823 static char *names
[] = {
824 "flags", "r1", "rp", "r3",
825 "r4", "r5", "r6", "r7",
826 "r8", "r9", "r10", "r11",
827 "r12", "r13", "r14", "r15",
828 "r16", "r17", "r18", "r19",
829 "r20", "r21", "r22", "r23",
830 "r24", "r25", "r26", "dp",
831 "ret0", "ret1", "sp", "r31",
832 "sar", "pcoqh", "pcsqh", "pcoqt",
833 "pcsqt", "eiem", "iir", "isr",
834 "ior", "ipsw", "goto", "sr4",
835 "sr0", "sr1", "sr2", "sr3",
836 "sr5", "sr6", "sr7", "cr0",
837 "cr8", "cr9", "ccr", "cr12",
838 "cr13", "cr24", "cr25", "cr26",
839 "mpsfu_high","mpsfu_low","mpsfu_ovflo","pad",
840 "fpsr", "fpe1", "fpe2", "fpe3",
841 "fpe4", "fpe5", "fpe6", "fpe7",
842 "fr4", "fr4R", "fr5", "fr5R",
843 "fr6", "fr6R", "fr7", "fr7R",
844 "fr8", "fr8R", "fr9", "fr9R",
845 "fr10", "fr10R", "fr11", "fr11R",
846 "fr12", "fr12R", "fr13", "fr13R",
847 "fr14", "fr14R", "fr15", "fr15R",
848 "fr16", "fr16R", "fr17", "fr17R",
849 "fr18", "fr18R", "fr19", "fr19R",
850 "fr20", "fr20R", "fr21", "fr21R",
851 "fr22", "fr22R", "fr23", "fr23R",
852 "fr24", "fr24R", "fr25", "fr25R",
853 "fr26", "fr26R", "fr27", "fr27R",
854 "fr28", "fr28R", "fr29", "fr29R",
855 "fr30", "fr30R", "fr31", "fr31R"
857 if (i
< 0 || i
>= (sizeof (names
) / sizeof (*names
)))
864 hppa64_register_name (int i
)
866 static char *names
[] = {
867 "flags", "r1", "rp", "r3",
868 "r4", "r5", "r6", "r7",
869 "r8", "r9", "r10", "r11",
870 "r12", "r13", "r14", "r15",
871 "r16", "r17", "r18", "r19",
872 "r20", "r21", "r22", "r23",
873 "r24", "r25", "r26", "dp",
874 "ret0", "ret1", "sp", "r31",
875 "sar", "pcoqh", "pcsqh", "pcoqt",
876 "pcsqt", "eiem", "iir", "isr",
877 "ior", "ipsw", "goto", "sr4",
878 "sr0", "sr1", "sr2", "sr3",
879 "sr5", "sr6", "sr7", "cr0",
880 "cr8", "cr9", "ccr", "cr12",
881 "cr13", "cr24", "cr25", "cr26",
882 "mpsfu_high","mpsfu_low","mpsfu_ovflo","pad",
883 "fpsr", "fpe1", "fpe2", "fpe3",
884 "fr4", "fr5", "fr6", "fr7",
885 "fr8", "fr9", "fr10", "fr11",
886 "fr12", "fr13", "fr14", "fr15",
887 "fr16", "fr17", "fr18", "fr19",
888 "fr20", "fr21", "fr22", "fr23",
889 "fr24", "fr25", "fr26", "fr27",
890 "fr28", "fr29", "fr30", "fr31"
892 if (i
< 0 || i
>= (sizeof (names
) / sizeof (*names
)))
900 /* Return the adjustment necessary to make for addresses on the stack
901 as presented by hpread.c.
903 This is necessary because of the stack direction on the PA and the
904 bizarre way in which someone (?) decided they wanted to handle
905 frame pointerless code in GDB. */
907 hpread_adjust_stack_address (CORE_ADDR func_addr
)
909 struct unwind_table_entry
*u
;
911 u
= find_unwind_entry (func_addr
);
915 return u
->Total_frame_size
<< 3;
918 /* Called to determine if PC is in an interrupt handler of some
922 pc_in_interrupt_handler (CORE_ADDR pc
)
924 struct unwind_table_entry
*u
;
925 struct minimal_symbol
*msym_us
;
927 u
= find_unwind_entry (pc
);
931 /* Oh joys. HPUX sets the interrupt bit for _sigreturn even though
932 its frame isn't a pure interrupt frame. Deal with this. */
933 msym_us
= lookup_minimal_symbol_by_pc (pc
);
935 return (u
->HP_UX_interrupt_marker
936 && !PC_IN_SIGTRAMP (pc
, DEPRECATED_SYMBOL_NAME (msym_us
)));
939 /* Called when no unwind descriptor was found for PC. Returns 1 if it
940 appears that PC is in a linker stub.
942 ?!? Need to handle stubs which appear in PA64 code. */
945 pc_in_linker_stub (CORE_ADDR pc
)
947 int found_magic_instruction
= 0;
951 /* If unable to read memory, assume pc is not in a linker stub. */
952 if (target_read_memory (pc
, buf
, 4) != 0)
955 /* We are looking for something like
957 ; $$dyncall jams RP into this special spot in the frame (RP')
958 ; before calling the "call stub"
961 ldsid (rp),r1 ; Get space associated with RP into r1
962 mtsp r1,sp ; Move it into space register 0
963 be,n 0(sr0),rp) ; back to your regularly scheduled program */
965 /* Maximum known linker stub size is 4 instructions. Search forward
966 from the given PC, then backward. */
967 for (i
= 0; i
< 4; i
++)
969 /* If we hit something with an unwind, stop searching this direction. */
971 if (find_unwind_entry (pc
+ i
* 4) != 0)
974 /* Check for ldsid (rp),r1 which is the magic instruction for a
975 return from a cross-space function call. */
976 if (read_memory_integer (pc
+ i
* 4, 4) == 0x004010a1)
978 found_magic_instruction
= 1;
981 /* Add code to handle long call/branch and argument relocation stubs
985 if (found_magic_instruction
!= 0)
988 /* Now look backward. */
989 for (i
= 0; i
< 4; i
++)
991 /* If we hit something with an unwind, stop searching this direction. */
993 if (find_unwind_entry (pc
- i
* 4) != 0)
996 /* Check for ldsid (rp),r1 which is the magic instruction for a
997 return from a cross-space function call. */
998 if (read_memory_integer (pc
- i
* 4, 4) == 0x004010a1)
1000 found_magic_instruction
= 1;
1003 /* Add code to handle long call/branch and argument relocation stubs
1006 return found_magic_instruction
;
1010 find_return_regnum (CORE_ADDR pc
)
1012 struct unwind_table_entry
*u
;
1014 u
= find_unwind_entry (pc
);
1025 /* Return size of frame, or -1 if we should use a frame pointer. */
1027 find_proc_framesize (CORE_ADDR pc
)
1029 struct unwind_table_entry
*u
;
1030 struct minimal_symbol
*msym_us
;
1032 /* This may indicate a bug in our callers... */
1033 if (pc
== (CORE_ADDR
) 0)
1036 u
= find_unwind_entry (pc
);
1040 if (pc_in_linker_stub (pc
))
1041 /* Linker stubs have a zero size frame. */
1047 msym_us
= lookup_minimal_symbol_by_pc (pc
);
1049 /* If Save_SP is set, and we're not in an interrupt or signal caller,
1050 then we have a frame pointer. Use it. */
1052 && !pc_in_interrupt_handler (pc
)
1054 && !PC_IN_SIGTRAMP (pc
, DEPRECATED_SYMBOL_NAME (msym_us
)))
1057 return u
->Total_frame_size
<< 3;
1060 /* Return offset from sp at which rp is saved, or 0 if not saved. */
1061 static int rp_saved (CORE_ADDR
);
1064 rp_saved (CORE_ADDR pc
)
1066 struct unwind_table_entry
*u
;
1068 /* A function at, and thus a return PC from, address 0? Not in HP-UX! */
1069 if (pc
== (CORE_ADDR
) 0)
1072 u
= find_unwind_entry (pc
);
1076 if (pc_in_linker_stub (pc
))
1077 /* This is the so-called RP'. */
1084 return (TARGET_PTR_BIT
== 64 ? -16 : -20);
1085 else if (u
->stub_unwind
.stub_type
!= 0)
1087 switch (u
->stub_unwind
.stub_type
)
1092 case PARAMETER_RELOCATION
:
1103 hppa_frameless_function_invocation (struct frame_info
*frame
)
1105 struct unwind_table_entry
*u
;
1107 u
= find_unwind_entry (get_frame_pc (frame
));
1112 return (u
->Total_frame_size
== 0 && u
->stub_unwind
.stub_type
== 0);
1115 /* Immediately after a function call, return the saved pc.
1116 Can't go through the frames for this because on some machines
1117 the new frame is not set up until the new function executes
1118 some instructions. */
1121 hppa_saved_pc_after_call (struct frame_info
*frame
)
1125 struct unwind_table_entry
*u
;
1127 ret_regnum
= find_return_regnum (get_frame_pc (frame
));
1128 pc
= read_register (ret_regnum
) & ~0x3;
1130 /* If PC is in a linker stub, then we need to dig the address
1131 the stub will return to out of the stack. */
1132 u
= find_unwind_entry (pc
);
1133 if (u
&& u
->stub_unwind
.stub_type
!= 0)
1134 return DEPRECATED_FRAME_SAVED_PC (frame
);
1140 hppa_frame_saved_pc (struct frame_info
*frame
)
1142 CORE_ADDR pc
= get_frame_pc (frame
);
1143 struct unwind_table_entry
*u
;
1144 CORE_ADDR old_pc
= 0;
1145 int spun_around_loop
= 0;
1148 /* BSD, HPUX & OSF1 all lay out the hardware state in the same manner
1149 at the base of the frame in an interrupt handler. Registers within
1150 are saved in the exact same order as GDB numbers registers. How
1152 if (pc_in_interrupt_handler (pc
))
1153 return read_memory_integer (get_frame_base (frame
) + PC_REGNUM
* 4,
1154 TARGET_PTR_BIT
/ 8) & ~0x3;
1156 if ((get_frame_pc (frame
) >= get_frame_base (frame
)
1157 && (get_frame_pc (frame
)
1158 <= (get_frame_base (frame
)
1159 /* A call dummy is sized in words, but it is actually a
1160 series of instructions. Account for that scaling
1162 + ((DEPRECATED_REGISTER_SIZE
/ INSTRUCTION_SIZE
)
1163 * DEPRECATED_CALL_DUMMY_LENGTH
)
1164 /* Similarly we have to account for 64bit wide register
1166 + (32 * DEPRECATED_REGISTER_SIZE
)
1167 /* We always consider FP regs 8 bytes long. */
1168 + (NUM_REGS
- FP0_REGNUM
) * 8
1169 /* Similarly we have to account for 64bit wide register
1171 + (6 * DEPRECATED_REGISTER_SIZE
)))))
1173 return read_memory_integer ((get_frame_base (frame
)
1174 + (TARGET_PTR_BIT
== 64 ? -16 : -20)),
1175 TARGET_PTR_BIT
/ 8) & ~0x3;
1178 #ifdef FRAME_SAVED_PC_IN_SIGTRAMP
1179 /* Deal with signal handler caller frames too. */
1180 if ((get_frame_type (frame
) == SIGTRAMP_FRAME
))
1183 FRAME_SAVED_PC_IN_SIGTRAMP (frame
, &rp
);
1188 if (hppa_frameless_function_invocation (frame
))
1192 ret_regnum
= find_return_regnum (pc
);
1194 /* If the next frame is an interrupt frame or a signal
1195 handler caller, then we need to look in the saved
1196 register area to get the return pointer (the values
1197 in the registers may not correspond to anything useful). */
1198 if (get_next_frame (frame
)
1199 && ((get_frame_type (get_next_frame (frame
)) == SIGTRAMP_FRAME
)
1200 || pc_in_interrupt_handler (get_frame_pc (get_next_frame (frame
)))))
1202 CORE_ADDR
*saved_regs
;
1203 hppa_frame_init_saved_regs (get_next_frame (frame
));
1204 saved_regs
= deprecated_get_frame_saved_regs (get_next_frame (frame
));
1205 if (read_memory_integer (saved_regs
[FLAGS_REGNUM
],
1206 TARGET_PTR_BIT
/ 8) & 0x2)
1208 pc
= read_memory_integer (saved_regs
[31],
1209 TARGET_PTR_BIT
/ 8) & ~0x3;
1211 /* Syscalls are really two frames. The syscall stub itself
1212 with a return pointer in %rp and the kernel call with
1213 a return pointer in %r31. We return the %rp variant
1214 if %r31 is the same as frame->pc. */
1215 if (pc
== get_frame_pc (frame
))
1216 pc
= read_memory_integer (saved_regs
[RP_REGNUM
],
1217 TARGET_PTR_BIT
/ 8) & ~0x3;
1220 pc
= read_memory_integer (saved_regs
[RP_REGNUM
],
1221 TARGET_PTR_BIT
/ 8) & ~0x3;
1224 pc
= read_register (ret_regnum
) & ~0x3;
1228 spun_around_loop
= 0;
1232 rp_offset
= rp_saved (pc
);
1234 /* Similar to code in frameless function case. If the next
1235 frame is a signal or interrupt handler, then dig the right
1236 information out of the saved register info. */
1238 && get_next_frame (frame
)
1239 && ((get_frame_type (get_next_frame (frame
)) == SIGTRAMP_FRAME
)
1240 || pc_in_interrupt_handler (get_frame_pc (get_next_frame (frame
)))))
1242 CORE_ADDR
*saved_regs
;
1243 hppa_frame_init_saved_regs (get_next_frame (frame
));
1244 saved_regs
= deprecated_get_frame_saved_regs (get_next_frame (frame
));
1245 if (read_memory_integer (saved_regs
[FLAGS_REGNUM
],
1246 TARGET_PTR_BIT
/ 8) & 0x2)
1248 pc
= read_memory_integer (saved_regs
[31],
1249 TARGET_PTR_BIT
/ 8) & ~0x3;
1251 /* Syscalls are really two frames. The syscall stub itself
1252 with a return pointer in %rp and the kernel call with
1253 a return pointer in %r31. We return the %rp variant
1254 if %r31 is the same as frame->pc. */
1255 if (pc
== get_frame_pc (frame
))
1256 pc
= read_memory_integer (saved_regs
[RP_REGNUM
],
1257 TARGET_PTR_BIT
/ 8) & ~0x3;
1260 pc
= read_memory_integer (saved_regs
[RP_REGNUM
],
1261 TARGET_PTR_BIT
/ 8) & ~0x3;
1263 else if (rp_offset
== 0)
1266 pc
= read_register (RP_REGNUM
) & ~0x3;
1271 pc
= read_memory_integer (get_frame_base (frame
) + rp_offset
,
1272 TARGET_PTR_BIT
/ 8) & ~0x3;
1276 /* If PC is inside a linker stub, then dig out the address the stub
1279 Don't do this for long branch stubs. Why? For some unknown reason
1280 _start is marked as a long branch stub in hpux10. */
1281 u
= find_unwind_entry (pc
);
1282 if (u
&& u
->stub_unwind
.stub_type
!= 0
1283 && u
->stub_unwind
.stub_type
!= LONG_BRANCH
)
1287 /* If this is a dynamic executable, and we're in a signal handler,
1288 then the call chain will eventually point us into the stub for
1289 _sigreturn. Unlike most cases, we'll be pointed to the branch
1290 to the real sigreturn rather than the code after the real branch!.
1292 Else, try to dig the address the stub will return to in the normal
1294 insn
= read_memory_integer (pc
, 4);
1295 if ((insn
& 0xfc00e000) == 0xe8000000)
1296 return (pc
+ extract_17 (insn
) + 8) & ~0x3;
1302 if (spun_around_loop
> 1)
1304 /* We're just about to go around the loop again with
1305 no more hope of success. Die. */
1306 error ("Unable to find return pc for this frame");
1316 /* We need to correct the PC and the FP for the outermost frame when we are
1317 in a system call. */
1320 hppa_init_extra_frame_info (int fromleaf
, struct frame_info
*frame
)
1325 if (get_next_frame (frame
) && !fromleaf
)
1328 /* If the next frame represents a frameless function invocation then
1329 we have to do some adjustments that are normally done by
1330 DEPRECATED_FRAME_CHAIN. (DEPRECATED_FRAME_CHAIN is not called in
1334 /* Find the framesize of *this* frame without peeking at the PC
1335 in the current frame structure (it isn't set yet). */
1336 framesize
= find_proc_framesize (DEPRECATED_FRAME_SAVED_PC (get_next_frame (frame
)));
1338 /* Now adjust our base frame accordingly. If we have a frame pointer
1339 use it, else subtract the size of this frame from the current
1340 frame. (we always want frame->frame to point at the lowest address
1342 if (framesize
== -1)
1343 deprecated_update_frame_base_hack (frame
, deprecated_read_fp ());
1345 deprecated_update_frame_base_hack (frame
, get_frame_base (frame
) - framesize
);
1349 flags
= read_register (FLAGS_REGNUM
);
1350 if (flags
& 2) /* In system call? */
1351 deprecated_update_frame_pc_hack (frame
, read_register (31) & ~0x3);
1353 /* The outermost frame is always derived from PC-framesize
1355 One might think frameless innermost frames should have
1356 a frame->frame that is the same as the parent's frame->frame.
1357 That is wrong; frame->frame in that case should be the *high*
1358 address of the parent's frame. It's complicated as hell to
1359 explain, but the parent *always* creates some stack space for
1360 the child. So the child actually does have a frame of some
1361 sorts, and its base is the high address in its parent's frame. */
1362 framesize
= find_proc_framesize (get_frame_pc (frame
));
1363 if (framesize
== -1)
1364 deprecated_update_frame_base_hack (frame
, deprecated_read_fp ());
1366 deprecated_update_frame_base_hack (frame
, read_register (SP_REGNUM
) - framesize
);
1369 /* Given a GDB frame, determine the address of the calling function's
1370 frame. This will be used to create a new GDB frame struct, and
1371 then DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC
1372 will be called for the new frame.
1374 This may involve searching through prologues for several functions
1375 at boundaries where GCC calls HP C code, or where code which has
1376 a frame pointer calls code without a frame pointer. */
1379 hppa_frame_chain (struct frame_info
*frame
)
1381 int my_framesize
, caller_framesize
;
1382 struct unwind_table_entry
*u
;
1383 CORE_ADDR frame_base
;
1384 struct frame_info
*tmp_frame
;
1386 /* A frame in the current frame list, or zero. */
1387 struct frame_info
*saved_regs_frame
= 0;
1388 /* Where the registers were saved in saved_regs_frame. If
1389 saved_regs_frame is zero, this is garbage. */
1390 CORE_ADDR
*saved_regs
= NULL
;
1392 CORE_ADDR caller_pc
;
1394 struct minimal_symbol
*min_frame_symbol
;
1395 struct symbol
*frame_symbol
;
1396 char *frame_symbol_name
;
1398 /* If this is a threaded application, and we see the
1399 routine "__pthread_exit", treat it as the stack root
1401 min_frame_symbol
= lookup_minimal_symbol_by_pc (get_frame_pc (frame
));
1402 frame_symbol
= find_pc_function (get_frame_pc (frame
));
1404 if ((min_frame_symbol
!= 0) /* && (frame_symbol == 0) */ )
1406 /* The test above for "no user function name" would defend
1407 against the slim likelihood that a user might define a
1408 routine named "__pthread_exit" and then try to debug it.
1410 If it weren't commented out, and you tried to debug the
1411 pthread library itself, you'd get errors.
1413 So for today, we don't make that check. */
1414 frame_symbol_name
= DEPRECATED_SYMBOL_NAME (min_frame_symbol
);
1415 if (frame_symbol_name
!= 0)
1417 if (0 == strncmp (frame_symbol_name
,
1418 THREAD_INITIAL_FRAME_SYMBOL
,
1419 THREAD_INITIAL_FRAME_SYM_LEN
))
1421 /* Pretend we've reached the bottom of the stack. */
1422 return (CORE_ADDR
) 0;
1425 } /* End of hacky code for threads. */
1427 /* Handle HPUX, BSD, and OSF1 style interrupt frames first. These
1428 are easy; at *sp we have a full save state strucutre which we can
1429 pull the old stack pointer from. Also see frame_saved_pc for
1430 code to dig a saved PC out of the save state structure. */
1431 if (pc_in_interrupt_handler (get_frame_pc (frame
)))
1432 frame_base
= read_memory_integer (get_frame_base (frame
) + SP_REGNUM
* 4,
1433 TARGET_PTR_BIT
/ 8);
1434 #ifdef FRAME_BASE_BEFORE_SIGTRAMP
1435 else if ((get_frame_type (frame
) == SIGTRAMP_FRAME
))
1437 FRAME_BASE_BEFORE_SIGTRAMP (frame
, &frame_base
);
1441 frame_base
= get_frame_base (frame
);
1443 /* Get frame sizes for the current frame and the frame of the
1445 my_framesize
= find_proc_framesize (get_frame_pc (frame
));
1446 caller_pc
= DEPRECATED_FRAME_SAVED_PC (frame
);
1448 /* If we can't determine the caller's PC, then it's not likely we can
1449 really determine anything meaningful about its frame. We'll consider
1450 this to be stack bottom. */
1451 if (caller_pc
== (CORE_ADDR
) 0)
1452 return (CORE_ADDR
) 0;
1454 caller_framesize
= find_proc_framesize (DEPRECATED_FRAME_SAVED_PC (frame
));
1456 /* If caller does not have a frame pointer, then its frame
1457 can be found at current_frame - caller_framesize. */
1458 if (caller_framesize
!= -1)
1460 return frame_base
- caller_framesize
;
1462 /* Both caller and callee have frame pointers and are GCC compiled
1463 (SAVE_SP bit in unwind descriptor is on for both functions.
1464 The previous frame pointer is found at the top of the current frame. */
1465 if (caller_framesize
== -1 && my_framesize
== -1)
1467 return read_memory_integer (frame_base
, TARGET_PTR_BIT
/ 8);
1469 /* Caller has a frame pointer, but callee does not. This is a little
1470 more difficult as GCC and HP C lay out locals and callee register save
1471 areas very differently.
1473 The previous frame pointer could be in a register, or in one of
1474 several areas on the stack.
1476 Walk from the current frame to the innermost frame examining
1477 unwind descriptors to determine if %r3 ever gets saved into the
1478 stack. If so return whatever value got saved into the stack.
1479 If it was never saved in the stack, then the value in %r3 is still
1482 We use information from unwind descriptors to determine if %r3
1483 is saved into the stack (Entry_GR field has this information). */
1485 for (tmp_frame
= frame
; tmp_frame
; tmp_frame
= get_next_frame (tmp_frame
))
1487 u
= find_unwind_entry (get_frame_pc (tmp_frame
));
1491 /* We could find this information by examining prologues. I don't
1492 think anyone has actually written any tools (not even "strip")
1493 which leave them out of an executable, so maybe this is a moot
1495 /* ??rehrauer: Actually, it's quite possible to stepi your way into
1496 code that doesn't have unwind entries. For example, stepping into
1497 the dynamic linker will give you a PC that has none. Thus, I've
1498 disabled this warning. */
1500 warning ("Unable to find unwind for PC 0x%x -- Help!", get_frame_pc (tmp_frame
));
1502 return (CORE_ADDR
) 0;
1506 || (get_frame_type (tmp_frame
) == SIGTRAMP_FRAME
)
1507 || pc_in_interrupt_handler (get_frame_pc (tmp_frame
)))
1510 /* Entry_GR specifies the number of callee-saved general registers
1511 saved in the stack. It starts at %r3, so %r3 would be 1. */
1512 if (u
->Entry_GR
>= 1)
1514 /* The unwind entry claims that r3 is saved here. However,
1515 in optimized code, GCC often doesn't actually save r3.
1516 We'll discover this if we look at the prologue. */
1517 hppa_frame_init_saved_regs (tmp_frame
);
1518 saved_regs
= deprecated_get_frame_saved_regs (tmp_frame
);
1519 saved_regs_frame
= tmp_frame
;
1521 /* If we have an address for r3, that's good. */
1522 if (saved_regs
[DEPRECATED_FP_REGNUM
])
1529 /* We may have walked down the chain into a function with a frame
1532 && !(get_frame_type (tmp_frame
) == SIGTRAMP_FRAME
)
1533 && !pc_in_interrupt_handler (get_frame_pc (tmp_frame
)))
1535 return read_memory_integer (get_frame_base (tmp_frame
), TARGET_PTR_BIT
/ 8);
1537 /* %r3 was saved somewhere in the stack. Dig it out. */
1542 For optimization purposes many kernels don't have the
1543 callee saved registers into the save_state structure upon
1544 entry into the kernel for a syscall; the optimization
1545 is usually turned off if the process is being traced so
1546 that the debugger can get full register state for the
1549 This scheme works well except for two cases:
1551 * Attaching to a process when the process is in the
1552 kernel performing a system call (debugger can't get
1553 full register state for the inferior process since
1554 the process wasn't being traced when it entered the
1557 * Register state is not complete if the system call
1558 causes the process to core dump.
1561 The following heinous code is an attempt to deal with
1562 the lack of register state in a core dump. It will
1563 fail miserably if the function which performs the
1564 system call has a variable sized stack frame. */
1566 if (tmp_frame
!= saved_regs_frame
)
1568 hppa_frame_init_saved_regs (tmp_frame
);
1569 saved_regs
= deprecated_get_frame_saved_regs (tmp_frame
);
1572 /* Abominable hack. */
1573 if (current_target
.to_has_execution
== 0
1574 && ((saved_regs
[FLAGS_REGNUM
]
1575 && (read_memory_integer (saved_regs
[FLAGS_REGNUM
],
1578 || (saved_regs
[FLAGS_REGNUM
] == 0
1579 && read_register (FLAGS_REGNUM
) & 0x2)))
1581 u
= find_unwind_entry (DEPRECATED_FRAME_SAVED_PC (frame
));
1584 return read_memory_integer (saved_regs
[DEPRECATED_FP_REGNUM
],
1585 TARGET_PTR_BIT
/ 8);
1589 return frame_base
- (u
->Total_frame_size
<< 3);
1593 return read_memory_integer (saved_regs
[DEPRECATED_FP_REGNUM
],
1594 TARGET_PTR_BIT
/ 8);
1599 /* Get the innermost frame. */
1601 while (get_next_frame (tmp_frame
) != NULL
)
1602 tmp_frame
= get_next_frame (tmp_frame
);
1604 if (tmp_frame
!= saved_regs_frame
)
1606 hppa_frame_init_saved_regs (tmp_frame
);
1607 saved_regs
= deprecated_get_frame_saved_regs (tmp_frame
);
1610 /* Abominable hack. See above. */
1611 if (current_target
.to_has_execution
== 0
1612 && ((saved_regs
[FLAGS_REGNUM
]
1613 && (read_memory_integer (saved_regs
[FLAGS_REGNUM
],
1616 || (saved_regs
[FLAGS_REGNUM
] == 0
1617 && read_register (FLAGS_REGNUM
) & 0x2)))
1619 u
= find_unwind_entry (DEPRECATED_FRAME_SAVED_PC (frame
));
1622 return read_memory_integer (saved_regs
[DEPRECATED_FP_REGNUM
],
1623 TARGET_PTR_BIT
/ 8);
1627 return frame_base
- (u
->Total_frame_size
<< 3);
1631 /* The value in %r3 was never saved into the stack (thus %r3 still
1632 holds the value of the previous frame pointer). */
1633 return deprecated_read_fp ();
1638 /* To see if a frame chain is valid, see if the caller looks like it
1639 was compiled with gcc. */
1642 hppa_frame_chain_valid (CORE_ADDR chain
, struct frame_info
*thisframe
)
1644 struct minimal_symbol
*msym_us
;
1645 struct minimal_symbol
*msym_start
;
1646 struct unwind_table_entry
*u
, *next_u
= NULL
;
1647 struct frame_info
*next
;
1649 u
= find_unwind_entry (get_frame_pc (thisframe
));
1654 /* We can't just check that the same of msym_us is "_start", because
1655 someone idiotically decided that they were going to make a Ltext_end
1656 symbol with the same address. This Ltext_end symbol is totally
1657 indistinguishable (as nearly as I can tell) from the symbol for a function
1658 which is (legitimately, since it is in the user's namespace)
1659 named Ltext_end, so we can't just ignore it. */
1660 msym_us
= lookup_minimal_symbol_by_pc (DEPRECATED_FRAME_SAVED_PC (thisframe
));
1661 msym_start
= lookup_minimal_symbol ("_start", NULL
, NULL
);
1664 && SYMBOL_VALUE_ADDRESS (msym_us
) == SYMBOL_VALUE_ADDRESS (msym_start
))
1667 /* Grrrr. Some new idiot decided that they don't want _start for the
1668 PRO configurations; $START$ calls main directly.... Deal with it. */
1669 msym_start
= lookup_minimal_symbol ("$START$", NULL
, NULL
);
1672 && SYMBOL_VALUE_ADDRESS (msym_us
) == SYMBOL_VALUE_ADDRESS (msym_start
))
1675 next
= get_next_frame (thisframe
);
1677 next_u
= find_unwind_entry (get_frame_pc (next
));
1679 /* If this frame does not save SP, has no stack, isn't a stub,
1680 and doesn't "call" an interrupt routine or signal handler caller,
1681 then its not valid. */
1682 if (u
->Save_SP
|| u
->Total_frame_size
|| u
->stub_unwind
.stub_type
!= 0
1683 || (get_next_frame (thisframe
) && (get_frame_type (get_next_frame (thisframe
)) == SIGTRAMP_FRAME
))
1684 || (next_u
&& next_u
->HP_UX_interrupt_marker
))
1687 if (pc_in_linker_stub (get_frame_pc (thisframe
)))
1693 /* These functions deal with saving and restoring register state
1694 around a function call in the inferior. They keep the stack
1695 double-word aligned; eventually, on an hp700, the stack will have
1696 to be aligned to a 64-byte boundary. */
1699 hppa_push_dummy_frame (void)
1701 CORE_ADDR sp
, pc
, pcspace
;
1703 CORE_ADDR int_buffer
;
1706 pc
= hppa_target_read_pc (inferior_ptid
);
1707 int_buffer
= read_register (FLAGS_REGNUM
);
1708 if (int_buffer
& 0x2)
1710 const unsigned int sid
= (pc
>> 30) & 0x3;
1712 pcspace
= read_register (SR4_REGNUM
);
1714 pcspace
= read_register (SR4_REGNUM
+ 4 + sid
);
1717 pcspace
= read_register (PCSQ_HEAD_REGNUM
);
1719 /* Space for "arguments"; the RP goes in here. */
1720 sp
= read_register (SP_REGNUM
) + 48;
1721 int_buffer
= read_register (RP_REGNUM
) | 0x3;
1723 /* The 32bit and 64bit ABIs save the return pointer into different
1725 if (DEPRECATED_REGISTER_SIZE
== 8)
1726 write_memory (sp
- 16, (char *) &int_buffer
, DEPRECATED_REGISTER_SIZE
);
1728 write_memory (sp
- 20, (char *) &int_buffer
, DEPRECATED_REGISTER_SIZE
);
1730 int_buffer
= deprecated_read_fp ();
1731 write_memory (sp
, (char *) &int_buffer
, DEPRECATED_REGISTER_SIZE
);
1733 write_register (DEPRECATED_FP_REGNUM
, sp
);
1735 sp
+= 2 * DEPRECATED_REGISTER_SIZE
;
1737 for (regnum
= 1; regnum
< 32; regnum
++)
1738 if (regnum
!= RP_REGNUM
&& regnum
!= DEPRECATED_FP_REGNUM
)
1739 sp
= push_word (sp
, read_register (regnum
));
1741 /* This is not necessary for the 64bit ABI. In fact it is dangerous. */
1742 if (DEPRECATED_REGISTER_SIZE
!= 8)
1745 for (regnum
= FP0_REGNUM
; regnum
< NUM_REGS
; regnum
++)
1747 deprecated_read_register_bytes (DEPRECATED_REGISTER_BYTE (regnum
),
1748 (char *) &freg_buffer
, 8);
1749 sp
= push_bytes (sp
, (char *) &freg_buffer
, 8);
1751 sp
= push_word (sp
, read_register (IPSW_REGNUM
));
1752 sp
= push_word (sp
, read_register (SAR_REGNUM
));
1753 sp
= push_word (sp
, pc
);
1754 sp
= push_word (sp
, pcspace
);
1755 sp
= push_word (sp
, pc
+ 4);
1756 sp
= push_word (sp
, pcspace
);
1757 write_register (SP_REGNUM
, sp
);
1761 find_dummy_frame_regs (struct frame_info
*frame
,
1762 CORE_ADDR frame_saved_regs
[])
1764 CORE_ADDR fp
= get_frame_base (frame
);
1767 /* The 32bit and 64bit ABIs save RP into different locations. */
1768 if (DEPRECATED_REGISTER_SIZE
== 8)
1769 frame_saved_regs
[RP_REGNUM
] = (fp
- 16) & ~0x3;
1771 frame_saved_regs
[RP_REGNUM
] = (fp
- 20) & ~0x3;
1773 frame_saved_regs
[DEPRECATED_FP_REGNUM
] = fp
;
1775 frame_saved_regs
[1] = fp
+ (2 * DEPRECATED_REGISTER_SIZE
);
1777 for (fp
+= 3 * DEPRECATED_REGISTER_SIZE
, i
= 3; i
< 32; i
++)
1779 if (i
!= DEPRECATED_FP_REGNUM
)
1781 frame_saved_regs
[i
] = fp
;
1782 fp
+= DEPRECATED_REGISTER_SIZE
;
1786 /* This is not necessary or desirable for the 64bit ABI. */
1787 if (DEPRECATED_REGISTER_SIZE
!= 8)
1790 for (i
= FP0_REGNUM
; i
< NUM_REGS
; i
++, fp
+= 8)
1791 frame_saved_regs
[i
] = fp
;
1793 frame_saved_regs
[IPSW_REGNUM
] = fp
;
1794 frame_saved_regs
[SAR_REGNUM
] = fp
+ DEPRECATED_REGISTER_SIZE
;
1795 frame_saved_regs
[PCOQ_HEAD_REGNUM
] = fp
+ 2 * DEPRECATED_REGISTER_SIZE
;
1796 frame_saved_regs
[PCSQ_HEAD_REGNUM
] = fp
+ 3 * DEPRECATED_REGISTER_SIZE
;
1797 frame_saved_regs
[PCOQ_TAIL_REGNUM
] = fp
+ 4 * DEPRECATED_REGISTER_SIZE
;
1798 frame_saved_regs
[PCSQ_TAIL_REGNUM
] = fp
+ 5 * DEPRECATED_REGISTER_SIZE
;
1802 hppa_pop_frame (void)
1804 struct frame_info
*frame
= get_current_frame ();
1805 CORE_ADDR fp
, npc
, target_pc
;
1810 fp
= get_frame_base (frame
);
1811 hppa_frame_init_saved_regs (frame
);
1812 fsr
= deprecated_get_frame_saved_regs (frame
);
1814 #ifndef NO_PC_SPACE_QUEUE_RESTORE
1815 if (fsr
[IPSW_REGNUM
]) /* Restoring a call dummy frame */
1816 restore_pc_queue (fsr
);
1819 for (regnum
= 31; regnum
> 0; regnum
--)
1821 write_register (regnum
, read_memory_integer (fsr
[regnum
],
1822 DEPRECATED_REGISTER_SIZE
));
1824 for (regnum
= NUM_REGS
- 1; regnum
>= FP0_REGNUM
; regnum
--)
1827 read_memory (fsr
[regnum
], (char *) &freg_buffer
, 8);
1828 deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (regnum
),
1829 (char *) &freg_buffer
, 8);
1832 if (fsr
[IPSW_REGNUM
])
1833 write_register (IPSW_REGNUM
,
1834 read_memory_integer (fsr
[IPSW_REGNUM
],
1835 DEPRECATED_REGISTER_SIZE
));
1837 if (fsr
[SAR_REGNUM
])
1838 write_register (SAR_REGNUM
,
1839 read_memory_integer (fsr
[SAR_REGNUM
],
1840 DEPRECATED_REGISTER_SIZE
));
1842 /* If the PC was explicitly saved, then just restore it. */
1843 if (fsr
[PCOQ_TAIL_REGNUM
])
1845 npc
= read_memory_integer (fsr
[PCOQ_TAIL_REGNUM
],
1846 DEPRECATED_REGISTER_SIZE
);
1847 write_register (PCOQ_TAIL_REGNUM
, npc
);
1849 /* Else use the value in %rp to set the new PC. */
1852 npc
= read_register (RP_REGNUM
);
1856 write_register (DEPRECATED_FP_REGNUM
, read_memory_integer (fp
, DEPRECATED_REGISTER_SIZE
));
1858 if (fsr
[IPSW_REGNUM
]) /* call dummy */
1859 write_register (SP_REGNUM
, fp
- 48);
1861 write_register (SP_REGNUM
, fp
);
1863 /* The PC we just restored may be inside a return trampoline. If so
1864 we want to restart the inferior and run it through the trampoline.
1866 Do this by setting a momentary breakpoint at the location the
1867 trampoline returns to.
1869 Don't skip through the trampoline if we're popping a dummy frame. */
1870 target_pc
= SKIP_TRAMPOLINE_CODE (npc
& ~0x3) & ~0x3;
1871 if (target_pc
&& !fsr
[IPSW_REGNUM
])
1873 struct symtab_and_line sal
;
1874 struct breakpoint
*breakpoint
;
1875 struct cleanup
*old_chain
;
1877 /* Set up our breakpoint. Set it to be silent as the MI code
1878 for "return_command" will print the frame we returned to. */
1879 sal
= find_pc_line (target_pc
, 0);
1881 breakpoint
= set_momentary_breakpoint (sal
, null_frame_id
, bp_finish
);
1882 breakpoint
->silent
= 1;
1884 /* So we can clean things up. */
1885 old_chain
= make_cleanup_delete_breakpoint (breakpoint
);
1887 /* Start up the inferior. */
1888 clear_proceed_status ();
1889 proceed_to_finish
= 1;
1890 proceed ((CORE_ADDR
) -1, TARGET_SIGNAL_DEFAULT
, 0);
1892 /* Perform our cleanups. */
1893 do_cleanups (old_chain
);
1895 flush_cached_frames ();
1898 /* After returning to a dummy on the stack, restore the instruction
1899 queue space registers. */
1902 restore_pc_queue (CORE_ADDR
*fsr
)
1904 CORE_ADDR pc
= read_pc ();
1905 CORE_ADDR new_pc
= read_memory_integer (fsr
[PCOQ_HEAD_REGNUM
],
1906 TARGET_PTR_BIT
/ 8);
1907 struct target_waitstatus w
;
1910 /* Advance past break instruction in the call dummy. */
1911 write_register (PCOQ_HEAD_REGNUM
, pc
+ 4);
1912 write_register (PCOQ_TAIL_REGNUM
, pc
+ 8);
1914 /* HPUX doesn't let us set the space registers or the space
1915 registers of the PC queue through ptrace. Boo, hiss.
1916 Conveniently, the call dummy has this sequence of instructions
1921 So, load up the registers and single step until we are in the
1924 write_register (21, read_memory_integer (fsr
[PCSQ_HEAD_REGNUM
],
1925 DEPRECATED_REGISTER_SIZE
));
1926 write_register (22, new_pc
);
1928 for (insn_count
= 0; insn_count
< 3; insn_count
++)
1930 /* FIXME: What if the inferior gets a signal right now? Want to
1931 merge this into wait_for_inferior (as a special kind of
1932 watchpoint? By setting a breakpoint at the end? Is there
1933 any other choice? Is there *any* way to do this stuff with
1934 ptrace() or some equivalent?). */
1936 target_wait (inferior_ptid
, &w
);
1938 if (w
.kind
== TARGET_WAITKIND_SIGNALLED
)
1940 stop_signal
= w
.value
.sig
;
1941 terminal_ours_for_output ();
1942 printf_unfiltered ("\nProgram terminated with signal %s, %s.\n",
1943 target_signal_to_name (stop_signal
),
1944 target_signal_to_string (stop_signal
));
1945 gdb_flush (gdb_stdout
);
1949 target_terminal_ours ();
1950 target_fetch_registers (-1);
1955 #ifdef PA20W_CALLING_CONVENTIONS
1957 /* This function pushes a stack frame with arguments as part of the
1958 inferior function calling mechanism.
1960 This is the version for the PA64, in which later arguments appear
1961 at higher addresses. (The stack always grows towards higher
1964 We simply allocate the appropriate amount of stack space and put
1965 arguments into their proper slots. The call dummy code will copy
1966 arguments into registers as needed by the ABI.
1968 This ABI also requires that the caller provide an argument pointer
1969 to the callee, so we do that too. */
1972 hppa_push_arguments (int nargs
, struct value
**args
, CORE_ADDR sp
,
1973 int struct_return
, CORE_ADDR struct_addr
)
1975 /* array of arguments' offsets */
1976 int *offset
= (int *) alloca (nargs
* sizeof (int));
1978 /* array of arguments' lengths: real lengths in bytes, not aligned to
1980 int *lengths
= (int *) alloca (nargs
* sizeof (int));
1982 /* The value of SP as it was passed into this function after
1984 CORE_ADDR orig_sp
= DEPRECATED_STACK_ALIGN (sp
);
1986 /* The number of stack bytes occupied by the current argument. */
1989 /* The total number of bytes reserved for the arguments. */
1990 int cum_bytes_reserved
= 0;
1992 /* Similarly, but aligned. */
1993 int cum_bytes_aligned
= 0;
1996 /* Iterate over each argument provided by the user. */
1997 for (i
= 0; i
< nargs
; i
++)
1999 struct type
*arg_type
= VALUE_TYPE (args
[i
]);
2001 /* Integral scalar values smaller than a register are padded on
2002 the left. We do this by promoting them to full-width,
2003 although the ABI says to pad them with garbage. */
2004 if (is_integral_type (arg_type
)
2005 && TYPE_LENGTH (arg_type
) < DEPRECATED_REGISTER_SIZE
)
2007 args
[i
] = value_cast ((TYPE_UNSIGNED (arg_type
)
2008 ? builtin_type_unsigned_long
2009 : builtin_type_long
),
2011 arg_type
= VALUE_TYPE (args
[i
]);
2014 lengths
[i
] = TYPE_LENGTH (arg_type
);
2016 /* Align the size of the argument to the word size for this
2018 bytes_reserved
= (lengths
[i
] + DEPRECATED_REGISTER_SIZE
- 1) & -DEPRECATED_REGISTER_SIZE
;
2020 offset
[i
] = cum_bytes_reserved
;
2022 /* Aggregates larger than eight bytes (the only types larger
2023 than eight bytes we have) are aligned on a 16-byte boundary,
2024 possibly padded on the right with garbage. This may leave an
2025 empty word on the stack, and thus an unused register, as per
2027 if (bytes_reserved
> 8)
2029 /* Round up the offset to a multiple of two slots. */
2030 int new_offset
= ((offset
[i
] + 2*DEPRECATED_REGISTER_SIZE
-1)
2031 & -(2*DEPRECATED_REGISTER_SIZE
));
2033 /* Note the space we've wasted, if any. */
2034 bytes_reserved
+= new_offset
- offset
[i
];
2035 offset
[i
] = new_offset
;
2038 cum_bytes_reserved
+= bytes_reserved
;
2041 /* CUM_BYTES_RESERVED already accounts for all the arguments
2042 passed by the user. However, the ABIs mandate minimum stack space
2043 allocations for outgoing arguments.
2045 The ABIs also mandate minimum stack alignments which we must
2047 cum_bytes_aligned
= DEPRECATED_STACK_ALIGN (cum_bytes_reserved
);
2048 sp
+= max (cum_bytes_aligned
, REG_PARM_STACK_SPACE
);
2050 /* Now write each of the args at the proper offset down the stack. */
2051 for (i
= 0; i
< nargs
; i
++)
2052 write_memory (orig_sp
+ offset
[i
], VALUE_CONTENTS (args
[i
]), lengths
[i
]);
2054 /* If a structure has to be returned, set up register 28 to hold its
2057 write_register (28, struct_addr
);
2059 /* For the PA64 we must pass a pointer to the outgoing argument list.
2060 The ABI mandates that the pointer should point to the first byte of
2061 storage beyond the register flushback area.
2063 However, the call dummy expects the outgoing argument pointer to
2064 be passed in register %r4. */
2065 write_register (4, orig_sp
+ REG_PARM_STACK_SPACE
);
2067 /* ?!? This needs further work. We need to set up the global data
2068 pointer for this procedure. This assumes the same global pointer
2069 for every procedure. The call dummy expects the dp value to
2070 be passed in register %r6. */
2071 write_register (6, read_register (27));
2073 /* The stack will have 64 bytes of additional space for a frame marker. */
2079 /* This function pushes a stack frame with arguments as part of the
2080 inferior function calling mechanism.
2082 This is the version of the function for the 32-bit PA machines, in
2083 which later arguments appear at lower addresses. (The stack always
2084 grows towards higher addresses.)
2086 We simply allocate the appropriate amount of stack space and put
2087 arguments into their proper slots. The call dummy code will copy
2088 arguments into registers as needed by the ABI. */
2091 hppa_push_arguments (int nargs
, struct value
**args
, CORE_ADDR sp
,
2092 int struct_return
, CORE_ADDR struct_addr
)
2094 /* array of arguments' offsets */
2095 int *offset
= (int *) alloca (nargs
* sizeof (int));
2097 /* array of arguments' lengths: real lengths in bytes, not aligned to
2099 int *lengths
= (int *) alloca (nargs
* sizeof (int));
2101 /* The number of stack bytes occupied by the current argument. */
2104 /* The total number of bytes reserved for the arguments. */
2105 int cum_bytes_reserved
= 0;
2107 /* Similarly, but aligned. */
2108 int cum_bytes_aligned
= 0;
2111 /* Iterate over each argument provided by the user. */
2112 for (i
= 0; i
< nargs
; i
++)
2114 lengths
[i
] = TYPE_LENGTH (VALUE_TYPE (args
[i
]));
2116 /* Align the size of the argument to the word size for this
2118 bytes_reserved
= (lengths
[i
] + DEPRECATED_REGISTER_SIZE
- 1) & -DEPRECATED_REGISTER_SIZE
;
2120 offset
[i
] = (cum_bytes_reserved
2121 + (lengths
[i
] > 4 ? bytes_reserved
: lengths
[i
]));
2123 /* If the argument is a double word argument, then it needs to be
2124 double word aligned. */
2125 if ((bytes_reserved
== 2 * DEPRECATED_REGISTER_SIZE
)
2126 && (offset
[i
] % 2 * DEPRECATED_REGISTER_SIZE
))
2129 /* BYTES_RESERVED is already aligned to the word, so we put
2130 the argument at one word more down the stack.
2132 This will leave one empty word on the stack, and one unused
2133 register as mandated by the ABI. */
2134 new_offset
= ((offset
[i
] + 2 * DEPRECATED_REGISTER_SIZE
- 1)
2135 & -(2 * DEPRECATED_REGISTER_SIZE
));
2137 if ((new_offset
- offset
[i
]) >= 2 * DEPRECATED_REGISTER_SIZE
)
2139 bytes_reserved
+= DEPRECATED_REGISTER_SIZE
;
2140 offset
[i
] += DEPRECATED_REGISTER_SIZE
;
2144 cum_bytes_reserved
+= bytes_reserved
;
2148 /* CUM_BYTES_RESERVED already accounts for all the arguments passed
2149 by the user. However, the ABI mandates minimum stack space
2150 allocations for outgoing arguments.
2152 The ABI also mandates minimum stack alignments which we must
2154 cum_bytes_aligned
= DEPRECATED_STACK_ALIGN (cum_bytes_reserved
);
2155 sp
+= max (cum_bytes_aligned
, REG_PARM_STACK_SPACE
);
2157 /* Now write each of the args at the proper offset down the stack.
2158 ?!? We need to promote values to a full register instead of skipping
2159 words in the stack. */
2160 for (i
= 0; i
< nargs
; i
++)
2161 write_memory (sp
- offset
[i
], VALUE_CONTENTS (args
[i
]), lengths
[i
]);
2163 /* If a structure has to be returned, set up register 28 to hold its
2166 write_register (28, struct_addr
);
2168 /* The stack will have 32 bytes of additional space for a frame marker. */
2174 /* This function pushes a stack frame with arguments as part of the
2175 inferior function calling mechanism.
2177 This is the version of the function for the 32-bit PA machines, in
2178 which later arguments appear at lower addresses. (The stack always
2179 grows towards higher addresses.)
2181 We simply allocate the appropriate amount of stack space and put
2182 arguments into their proper slots. */
2185 hppa32_push_dummy_call (struct gdbarch
*gdbarch
, CORE_ADDR func_addr
,
2186 struct regcache
*regcache
, CORE_ADDR bp_addr
,
2187 int nargs
, struct value
**args
, CORE_ADDR sp
,
2188 int struct_return
, CORE_ADDR struct_addr
)
2190 /* NOTE: cagney/2004-02-27: This is a guess - its implemented by
2191 reverse engineering testsuite failures. */
2193 /* Stack base address at which any pass-by-reference parameters are
2195 CORE_ADDR struct_end
= 0;
2196 /* Stack base address at which the first parameter is stored. */
2197 CORE_ADDR param_end
= 0;
2199 /* The inner most end of the stack after all the parameters have
2201 CORE_ADDR new_sp
= 0;
2203 /* Two passes. First pass computes the location of everything,
2204 second pass writes the bytes out. */
2206 for (write_pass
= 0; write_pass
< 2; write_pass
++)
2208 CORE_ADDR struct_ptr
= struct_end
;
2209 CORE_ADDR param_ptr
= param_end
;
2210 int reg
= 27; /* NOTE: Registers go down. */
2212 for (i
= 0; i
< nargs
; i
++)
2214 struct value
*arg
= args
[i
];
2215 struct type
*type
= check_typedef (VALUE_TYPE (arg
));
2216 /* The corresponding parameter that is pushed onto the
2217 stack, and [possibly] passed in a register. */
2220 memset (param_val
, 0, sizeof param_val
);
2221 if (TYPE_LENGTH (type
) > 8)
2223 /* Large parameter, pass by reference. Store the value
2224 in "struct" area and then pass its address. */
2226 struct_ptr
-= align_up (TYPE_LENGTH (type
), 8);
2228 write_memory (struct_ptr
, VALUE_CONTENTS (arg
),
2229 TYPE_LENGTH (type
));
2230 store_unsigned_integer (param_val
, 4, struct_ptr
);
2232 else if (TYPE_CODE (type
) == TYPE_CODE_INT
2233 || TYPE_CODE (type
) == TYPE_CODE_ENUM
)
2235 /* Integer value store, right aligned. "unpack_long"
2236 takes care of any sign-extension problems. */
2237 param_len
= align_up (TYPE_LENGTH (type
), 4);
2238 store_unsigned_integer (param_val
, param_len
,
2240 VALUE_CONTENTS (arg
)));
2244 /* Small struct value, store right aligned? */
2245 param_len
= align_up (TYPE_LENGTH (type
), 4);
2246 memcpy (param_val
+ param_len
- TYPE_LENGTH (type
),
2247 VALUE_CONTENTS (arg
), TYPE_LENGTH (type
));
2249 param_ptr
-= param_len
;
2250 reg
-= param_len
/ 4;
2253 write_memory (param_ptr
, param_val
, param_len
);
2256 regcache_cooked_write (regcache
, reg
, param_val
);
2258 regcache_cooked_write (regcache
, reg
+ 1, param_val
+ 4);
2263 /* Update the various stack pointers. */
2266 struct_end
= sp
+ struct_ptr
;
2267 /* PARAM_PTR already accounts for all the arguments passed
2268 by the user. However, the ABI mandates minimum stack
2269 space allocations for outgoing arguments. The ABI also
2270 mandates minimum stack alignments which we must
2272 param_end
= struct_end
+ max (align_up (param_ptr
, 8),
2273 REG_PARM_STACK_SPACE
);
2277 /* If a structure has to be returned, set up register 28 to hold its
2280 write_register (28, struct_addr
);
2282 /* Set the return address. */
2283 regcache_cooked_write_unsigned (regcache
, RP_REGNUM
, bp_addr
);
2285 /* The stack will have 32 bytes of additional space for a frame marker. */
2286 return param_end
+ 32;
2289 /* This function pushes a stack frame with arguments as part of the
2290 inferior function calling mechanism.
2292 This is the version for the PA64, in which later arguments appear
2293 at higher addresses. (The stack always grows towards higher
2296 We simply allocate the appropriate amount of stack space and put
2297 arguments into their proper slots.
2299 This ABI also requires that the caller provide an argument pointer
2300 to the callee, so we do that too. */
2303 hppa64_push_dummy_call (struct gdbarch
*gdbarch
, CORE_ADDR func_addr
,
2304 struct regcache
*regcache
, CORE_ADDR bp_addr
,
2305 int nargs
, struct value
**args
, CORE_ADDR sp
,
2306 int struct_return
, CORE_ADDR struct_addr
)
2308 /* Array of arguments' offsets. */
2309 int *offset
= (int *) alloca (nargs
* sizeof (int));
2311 /* Array of arguments' lengths: real lengths in bytes, not aligned
2313 int *lengths
= (int *) alloca (nargs
* sizeof (int));
2315 /* The value of SP as it was passed into this function. */
2316 CORE_ADDR orig_sp
= sp
;
2318 /* The number of stack bytes occupied by the current argument. */
2321 /* The total number of bytes reserved for the arguments. */
2322 int cum_bytes_reserved
= 0;
2324 /* Similarly, but aligned. */
2325 int cum_bytes_aligned
= 0;
2328 /* Iterate over each argument provided by the user. */
2329 for (i
= 0; i
< nargs
; i
++)
2331 struct type
*arg_type
= VALUE_TYPE (args
[i
]);
2333 /* Integral scalar values smaller than a register are padded on
2334 the left. We do this by promoting them to full-width,
2335 although the ABI says to pad them with garbage. */
2336 if (is_integral_type (arg_type
)
2337 && TYPE_LENGTH (arg_type
) < DEPRECATED_REGISTER_SIZE
)
2339 args
[i
] = value_cast ((TYPE_UNSIGNED (arg_type
)
2340 ? builtin_type_unsigned_long
2341 : builtin_type_long
),
2343 arg_type
= VALUE_TYPE (args
[i
]);
2346 lengths
[i
] = TYPE_LENGTH (arg_type
);
2348 /* Align the size of the argument to the word size for this
2350 bytes_reserved
= (lengths
[i
] + DEPRECATED_REGISTER_SIZE
- 1) & -DEPRECATED_REGISTER_SIZE
;
2352 offset
[i
] = cum_bytes_reserved
;
2354 /* Aggregates larger than eight bytes (the only types larger
2355 than eight bytes we have) are aligned on a 16-byte boundary,
2356 possibly padded on the right with garbage. This may leave an
2357 empty word on the stack, and thus an unused register, as per
2359 if (bytes_reserved
> 8)
2361 /* Round up the offset to a multiple of two slots. */
2362 int new_offset
= ((offset
[i
] + 2*DEPRECATED_REGISTER_SIZE
-1)
2363 & -(2*DEPRECATED_REGISTER_SIZE
));
2365 /* Note the space we've wasted, if any. */
2366 bytes_reserved
+= new_offset
- offset
[i
];
2367 offset
[i
] = new_offset
;
2370 cum_bytes_reserved
+= bytes_reserved
;
2373 /* CUM_BYTES_RESERVED already accounts for all the arguments passed
2374 by the user. However, the ABIs mandate minimum stack space
2375 allocations for outgoing arguments.
2377 The ABIs also mandate minimum stack alignments which we must
2379 cum_bytes_aligned
= align_up (cum_bytes_reserved
, 16);
2380 sp
+= max (cum_bytes_aligned
, REG_PARM_STACK_SPACE
);
2382 /* Now write each of the args at the proper offset down the
2384 for (i
= 0; i
< nargs
; i
++)
2385 write_memory (orig_sp
+ offset
[i
], VALUE_CONTENTS (args
[i
]), lengths
[i
]);
2387 /* If a structure has to be returned, set up register 28 to hold its
2390 write_register (28, struct_addr
);
2392 /* For the PA64 we must pass a pointer to the outgoing argument
2393 list. The ABI mandates that the pointer should point to the
2394 first byte of storage beyond the register flushback area.
2396 However, the call dummy expects the outgoing argument pointer to
2397 be passed in register %r4. */
2398 write_register (4, orig_sp
+ REG_PARM_STACK_SPACE
);
2400 /* ?!? This needs further work. We need to set up the global data
2401 pointer for this procedure. This assumes the same global pointer
2402 for every procedure. The call dummy expects the dp value to be
2403 passed in register %r6. */
2404 write_register (6, read_register (27));
2406 /* Set the return address. */
2407 regcache_cooked_write_unsigned (regcache
, RP_REGNUM
, bp_addr
);
2409 /* The stack will have 64 bytes of additional space for a frame
2415 /* Force all frames to 16-byte alignment. Better safe than sorry. */
2418 hppa_frame_align (struct gdbarch
*gdbarch
, CORE_ADDR addr
)
2420 /* Just always 16-byte align. */
2421 return align_up (addr
, 16);
2425 /* elz: Used to lookup a symbol in the shared libraries.
2426 This function calls shl_findsym, indirectly through a
2427 call to __d_shl_get. __d_shl_get is in end.c, which is always
2428 linked in by the hp compilers/linkers.
2429 The call to shl_findsym cannot be made directly because it needs
2430 to be active in target address space.
2431 inputs: - minimal symbol pointer for the function we want to look up
2432 - address in target space of the descriptor for the library
2433 where we want to look the symbol up.
2434 This address is retrieved using the
2435 som_solib_get_solib_by_pc function (somsolib.c).
2436 output: - real address in the library of the function.
2437 note: the handle can be null, in which case shl_findsym will look for
2438 the symbol in all the loaded shared libraries.
2439 files to look at if you need reference on this stuff:
2440 dld.c, dld_shl_findsym.c
2442 man entry for shl_findsym */
2445 find_stub_with_shl_get (struct minimal_symbol
*function
, CORE_ADDR handle
)
2447 struct symbol
*get_sym
, *symbol2
;
2448 struct minimal_symbol
*buff_minsym
, *msymbol
;
2450 struct value
**args
;
2451 struct value
*funcval
;
2454 int x
, namelen
, err_value
, tmp
= -1;
2455 CORE_ADDR endo_buff_addr
, value_return_addr
, errno_return_addr
;
2456 CORE_ADDR stub_addr
;
2459 args
= alloca (sizeof (struct value
*) * 8); /* 6 for the arguments and one null one??? */
2460 funcval
= find_function_in_inferior ("__d_shl_get");
2461 get_sym
= lookup_symbol ("__d_shl_get", NULL
, VAR_DOMAIN
, NULL
, NULL
);
2462 buff_minsym
= lookup_minimal_symbol ("__buffer", NULL
, NULL
);
2463 msymbol
= lookup_minimal_symbol ("__shldp", NULL
, NULL
);
2464 symbol2
= lookup_symbol ("__shldp", NULL
, VAR_DOMAIN
, NULL
, NULL
);
2465 endo_buff_addr
= SYMBOL_VALUE_ADDRESS (buff_minsym
);
2466 namelen
= strlen (DEPRECATED_SYMBOL_NAME (function
));
2467 value_return_addr
= endo_buff_addr
+ namelen
;
2468 ftype
= check_typedef (SYMBOL_TYPE (get_sym
));
2471 if ((x
= value_return_addr
% 64) != 0)
2472 value_return_addr
= value_return_addr
+ 64 - x
;
2474 errno_return_addr
= value_return_addr
+ 64;
2477 /* set up stuff needed by __d_shl_get in buffer in end.o */
2479 target_write_memory (endo_buff_addr
, DEPRECATED_SYMBOL_NAME (function
), namelen
);
2481 target_write_memory (value_return_addr
, (char *) &tmp
, 4);
2483 target_write_memory (errno_return_addr
, (char *) &tmp
, 4);
2485 target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol
),
2486 (char *) &handle
, 4);
2488 /* now prepare the arguments for the call */
2490 args
[0] = value_from_longest (TYPE_FIELD_TYPE (ftype
, 0), 12);
2491 args
[1] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 1), SYMBOL_VALUE_ADDRESS (msymbol
));
2492 args
[2] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 2), endo_buff_addr
);
2493 args
[3] = value_from_longest (TYPE_FIELD_TYPE (ftype
, 3), TYPE_PROCEDURE
);
2494 args
[4] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 4), value_return_addr
);
2495 args
[5] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 5), errno_return_addr
);
2497 /* now call the function */
2499 val
= call_function_by_hand (funcval
, 6, args
);
2501 /* now get the results */
2503 target_read_memory (errno_return_addr
, (char *) &err_value
, sizeof (err_value
));
2505 target_read_memory (value_return_addr
, (char *) &stub_addr
, sizeof (stub_addr
));
2507 error ("call to __d_shl_get failed, error code is %d", err_value
);
2512 /* Cover routine for find_stub_with_shl_get to pass to catch_errors */
2514 cover_find_stub_with_shl_get (void *args_untyped
)
2516 args_for_find_stub
*args
= args_untyped
;
2517 args
->return_val
= find_stub_with_shl_get (args
->msym
, args
->solib_handle
);
2521 /* Insert the specified number of args and function address
2522 into a call sequence of the above form stored at DUMMYNAME.
2524 On the hppa we need to call the stack dummy through $$dyncall.
2525 Therefore our version of DEPRECATED_FIX_CALL_DUMMY takes an extra
2526 argument, real_pc, which is the location where gdb should start up
2527 the inferior to do the function call.
2529 This has to work across several versions of hpux, bsd, osf1. It has to
2530 work regardless of what compiler was used to build the inferior program.
2531 It should work regardless of whether or not end.o is available. It has
2532 to work even if gdb can not call into the dynamic loader in the inferior
2533 to query it for symbol names and addresses.
2535 Yes, all those cases should work. Luckily code exists to handle most
2536 of them. The complexity is in selecting exactly what scheme should
2537 be used to perform the inferior call.
2539 At the current time this routine is known not to handle cases where
2540 the program was linked with HP's compiler without including end.o.
2542 Please contact Jeff Law (law@cygnus.com) before changing this code. */
2545 hppa_fix_call_dummy (char *dummy
, CORE_ADDR pc
, CORE_ADDR fun
, int nargs
,
2546 struct value
**args
, struct type
*type
, int gcc_p
)
2548 CORE_ADDR dyncall_addr
;
2549 struct minimal_symbol
*msymbol
;
2550 struct minimal_symbol
*trampoline
;
2551 int flags
= read_register (FLAGS_REGNUM
);
2552 struct unwind_table_entry
*u
= NULL
;
2553 CORE_ADDR new_stub
= 0;
2554 CORE_ADDR solib_handle
= 0;
2556 /* Nonzero if we will use GCC's PLT call routine. This routine must be
2557 passed an import stub, not a PLABEL. It is also necessary to set %r19
2558 (the PIC register) before performing the call.
2560 If zero, then we are using __d_plt_call (HP's PLT call routine) or we
2561 are calling the target directly. When using __d_plt_call we want to
2562 use a PLABEL instead of an import stub. */
2563 int using_gcc_plt_call
= 1;
2565 #ifdef GDB_TARGET_IS_HPPA_20W
2566 /* We currently use completely different code for the PA2.0W inferior
2567 function call sequences. This needs to be cleaned up. */
2569 CORE_ADDR pcsqh
, pcsqt
, pcoqh
, pcoqt
, sr5
;
2570 struct target_waitstatus w
;
2574 struct objfile
*objfile
;
2576 /* We can not modify the PC space queues directly, so we start
2577 up the inferior and execute a couple instructions to set the
2578 space queues so that they point to the call dummy in the stack. */
2579 pcsqh
= read_register (PCSQ_HEAD_REGNUM
);
2580 sr5
= read_register (SR5_REGNUM
);
2583 pcoqh
= read_register (PCOQ_HEAD_REGNUM
);
2584 pcoqt
= read_register (PCOQ_TAIL_REGNUM
);
2585 if (target_read_memory (pcoqh
, buf
, 4) != 0)
2586 error ("Couldn't modify space queue\n");
2587 inst1
= extract_unsigned_integer (buf
, 4);
2589 if (target_read_memory (pcoqt
, buf
, 4) != 0)
2590 error ("Couldn't modify space queue\n");
2591 inst2
= extract_unsigned_integer (buf
, 4);
2594 *((int *) buf
) = 0xe820d000;
2595 if (target_write_memory (pcoqh
, buf
, 4) != 0)
2596 error ("Couldn't modify space queue\n");
2599 *((int *) buf
) = 0x08000240;
2600 if (target_write_memory (pcoqt
, buf
, 4) != 0)
2602 *((int *) buf
) = inst1
;
2603 target_write_memory (pcoqh
, buf
, 4);
2604 error ("Couldn't modify space queue\n");
2607 write_register (1, pc
);
2609 /* Single step twice, the BVE instruction will set the space queue
2610 such that it points to the PC value written immediately above
2611 (ie the call dummy). */
2613 target_wait (inferior_ptid
, &w
);
2615 target_wait (inferior_ptid
, &w
);
2617 /* Restore the two instructions at the old PC locations. */
2618 *((int *) buf
) = inst1
;
2619 target_write_memory (pcoqh
, buf
, 4);
2620 *((int *) buf
) = inst2
;
2621 target_write_memory (pcoqt
, buf
, 4);
2624 /* The call dummy wants the ultimate destination address initially
2626 write_register (5, fun
);
2628 /* We need to see if this objfile has a different DP value than our
2629 own (it could be a shared library for example). */
2630 ALL_OBJFILES (objfile
)
2632 struct obj_section
*s
;
2633 obj_private_data_t
*obj_private
;
2635 /* See if FUN is in any section within this shared library. */
2636 for (s
= objfile
->sections
; s
< objfile
->sections_end
; s
++)
2637 if (s
->addr
<= fun
&& fun
< s
->endaddr
)
2640 if (s
>= objfile
->sections_end
)
2643 obj_private
= (obj_private_data_t
*) objfile
->obj_private
;
2645 /* The DP value may be different for each objfile. But within an
2646 objfile each function uses the same dp value. Thus we do not need
2647 to grope around the opd section looking for dp values.
2649 ?!? This is not strictly correct since we may be in a shared library
2650 and want to call back into the main program. To make that case
2651 work correctly we need to set obj_private->dp for the main program's
2652 objfile, then remove this conditional. */
2653 if (obj_private
->dp
)
2654 write_register (27, obj_private
->dp
);
2661 #ifndef GDB_TARGET_IS_HPPA_20W
2662 /* Prefer __gcc_plt_call over the HP supplied routine because
2663 __gcc_plt_call works for any number of arguments. */
2665 if (lookup_minimal_symbol ("__gcc_plt_call", NULL
, NULL
) == NULL
)
2666 using_gcc_plt_call
= 0;
2668 msymbol
= lookup_minimal_symbol ("$$dyncall", NULL
, NULL
);
2669 if (msymbol
== NULL
)
2670 error ("Can't find an address for $$dyncall trampoline");
2672 dyncall_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
2674 /* FUN could be a procedure label, in which case we have to get
2675 its real address and the value of its GOT/DP if we plan to
2676 call the routine via gcc_plt_call. */
2677 if ((fun
& 0x2) && using_gcc_plt_call
)
2679 /* Get the GOT/DP value for the target function. It's
2680 at *(fun+4). Note the call dummy is *NOT* allowed to
2681 trash %r19 before calling the target function. */
2682 write_register (19, read_memory_integer ((fun
& ~0x3) + 4,
2683 DEPRECATED_REGISTER_SIZE
));
2685 /* Now get the real address for the function we are calling, it's
2687 fun
= (CORE_ADDR
) read_memory_integer (fun
& ~0x3,
2688 TARGET_PTR_BIT
/ 8);
2693 #ifndef GDB_TARGET_IS_PA_ELF
2694 /* FUN could be an export stub, the real address of a function, or
2695 a PLABEL. When using gcc's PLT call routine we must call an import
2696 stub rather than the export stub or real function for lazy binding
2699 If we are using the gcc PLT call routine, then we need to
2700 get the import stub for the target function. */
2701 if (using_gcc_plt_call
&& som_solib_get_got_by_pc (fun
))
2703 struct objfile
*objfile
;
2704 struct minimal_symbol
*funsymbol
, *stub_symbol
;
2705 CORE_ADDR newfun
= 0;
2707 funsymbol
= lookup_minimal_symbol_by_pc (fun
);
2709 error ("Unable to find minimal symbol for target function.\n");
2711 /* Search all the object files for an import symbol with the
2713 ALL_OBJFILES (objfile
)
2716 = lookup_minimal_symbol_solib_trampoline
2717 (DEPRECATED_SYMBOL_NAME (funsymbol
), objfile
);
2720 stub_symbol
= lookup_minimal_symbol (DEPRECATED_SYMBOL_NAME (funsymbol
),
2723 /* Found a symbol with the right name. */
2726 struct unwind_table_entry
*u
;
2727 /* It must be a shared library trampoline. */
2728 if (MSYMBOL_TYPE (stub_symbol
) != mst_solib_trampoline
)
2731 /* It must also be an import stub. */
2732 u
= find_unwind_entry (SYMBOL_VALUE (stub_symbol
));
2734 || (u
->stub_unwind
.stub_type
!= IMPORT
2735 #ifdef GDB_NATIVE_HPUX_11
2736 /* Sigh. The hpux 10.20 dynamic linker will blow
2737 chunks if we perform a call to an unbound function
2738 via the IMPORT_SHLIB stub. The hpux 11.00 dynamic
2739 linker will blow chunks if we do not call the
2740 unbound function via the IMPORT_SHLIB stub.
2742 We currently have no way to select bevahior on just
2743 the target. However, we only support HPUX/SOM in
2744 native mode. So we conditinalize on a native
2745 #ifdef. Ugly. Ugly. Ugly */
2746 && u
->stub_unwind
.stub_type
!= IMPORT_SHLIB
2751 /* OK. Looks like the correct import stub. */
2752 newfun
= SYMBOL_VALUE (stub_symbol
);
2755 /* If we found an IMPORT stub, then we want to stop
2756 searching now. If we found an IMPORT_SHLIB, we want
2757 to continue the search in the hopes that we will find
2759 if (u
->stub_unwind
.stub_type
== IMPORT
)
2764 /* Ouch. We did not find an import stub. Make an attempt to
2765 do the right thing instead of just croaking. Most of the
2766 time this will actually work. */
2768 write_register (19, som_solib_get_got_by_pc (fun
));
2770 u
= find_unwind_entry (fun
);
2772 && (u
->stub_unwind
.stub_type
== IMPORT
2773 || u
->stub_unwind
.stub_type
== IMPORT_SHLIB
))
2774 trampoline
= lookup_minimal_symbol ("__gcc_plt_call", NULL
, NULL
);
2776 /* If we found the import stub in the shared library, then we have
2777 to set %r19 before we call the stub. */
2778 if (u
&& u
->stub_unwind
.stub_type
== IMPORT_SHLIB
)
2779 write_register (19, som_solib_get_got_by_pc (fun
));
2784 /* If we are calling into another load module then have sr4export call the
2785 magic __d_plt_call routine which is linked in from end.o.
2787 You can't use _sr4export to make the call as the value in sp-24 will get
2788 fried and you end up returning to the wrong location. You can't call the
2789 target as the code to bind the PLT entry to a function can't return to a
2792 Also, query the dynamic linker in the inferior to provide a suitable
2793 PLABEL for the target function. */
2794 if (!using_gcc_plt_call
)
2798 /* Get a handle for the shared library containing FUN. Given the
2799 handle we can query the shared library for a PLABEL. */
2800 solib_handle
= som_solib_get_solib_by_pc (fun
);
2804 struct minimal_symbol
*fmsymbol
= lookup_minimal_symbol_by_pc (fun
);
2806 trampoline
= lookup_minimal_symbol ("__d_plt_call", NULL
, NULL
);
2808 if (trampoline
== NULL
)
2810 error ("Can't find an address for __d_plt_call or __gcc_plt_call trampoline\nSuggest linking executable with -g or compiling with gcc.");
2813 /* This is where sr4export will jump to. */
2814 new_fun
= SYMBOL_VALUE_ADDRESS (trampoline
);
2816 /* If the function is in a shared library, then call __d_shl_get to
2817 get a PLABEL for the target function. */
2818 new_stub
= find_stub_with_shl_get (fmsymbol
, solib_handle
);
2821 error ("Can't find an import stub for %s", DEPRECATED_SYMBOL_NAME (fmsymbol
));
2823 /* We have to store the address of the stub in __shlib_funcptr. */
2824 msymbol
= lookup_minimal_symbol ("__shlib_funcptr", NULL
,
2825 (struct objfile
*) NULL
);
2827 if (msymbol
== NULL
)
2828 error ("Can't find an address for __shlib_funcptr");
2829 target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol
),
2830 (char *) &new_stub
, 4);
2832 /* We want sr4export to call __d_plt_call, so we claim it is
2833 the final target. Clear trampoline. */
2839 /* Store upper 21 bits of function address into ldil. fun will either be
2840 the final target (most cases) or __d_plt_call when calling into a shared
2841 library and __gcc_plt_call is not available. */
2842 store_unsigned_integer
2843 (&dummy
[FUNC_LDIL_OFFSET
],
2845 deposit_21 (fun
>> 11,
2846 extract_unsigned_integer (&dummy
[FUNC_LDIL_OFFSET
],
2847 INSTRUCTION_SIZE
)));
2849 /* Store lower 11 bits of function address into ldo */
2850 store_unsigned_integer
2851 (&dummy
[FUNC_LDO_OFFSET
],
2853 deposit_14 (fun
& MASK_11
,
2854 extract_unsigned_integer (&dummy
[FUNC_LDO_OFFSET
],
2855 INSTRUCTION_SIZE
)));
2856 #ifdef SR4EXPORT_LDIL_OFFSET
2859 CORE_ADDR trampoline_addr
;
2861 /* We may still need sr4export's address too. */
2863 if (trampoline
== NULL
)
2865 msymbol
= lookup_minimal_symbol ("_sr4export", NULL
, NULL
);
2866 if (msymbol
== NULL
)
2867 error ("Can't find an address for _sr4export trampoline");
2869 trampoline_addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
2872 trampoline_addr
= SYMBOL_VALUE_ADDRESS (trampoline
);
2875 /* Store upper 21 bits of trampoline's address into ldil */
2876 store_unsigned_integer
2877 (&dummy
[SR4EXPORT_LDIL_OFFSET
],
2879 deposit_21 (trampoline_addr
>> 11,
2880 extract_unsigned_integer (&dummy
[SR4EXPORT_LDIL_OFFSET
],
2881 INSTRUCTION_SIZE
)));
2883 /* Store lower 11 bits of trampoline's address into ldo */
2884 store_unsigned_integer
2885 (&dummy
[SR4EXPORT_LDO_OFFSET
],
2887 deposit_14 (trampoline_addr
& MASK_11
,
2888 extract_unsigned_integer (&dummy
[SR4EXPORT_LDO_OFFSET
],
2889 INSTRUCTION_SIZE
)));
2893 write_register (22, pc
);
2895 /* If we are in a syscall, then we should call the stack dummy
2896 directly. $$dyncall is not needed as the kernel sets up the
2897 space id registers properly based on the value in %r31. In
2898 fact calling $$dyncall will not work because the value in %r22
2899 will be clobbered on the syscall exit path.
2901 Similarly if the current PC is in a shared library. Note however,
2902 this scheme won't work if the shared library isn't mapped into
2903 the same space as the stack. */
2906 #ifndef GDB_TARGET_IS_PA_ELF
2907 else if (som_solib_get_got_by_pc (hppa_target_read_pc (inferior_ptid
)))
2911 return dyncall_addr
;
2915 /* If the pid is in a syscall, then the FP register is not readable.
2916 We'll return zero in that case, rather than attempting to read it
2917 and cause a warning. */
2920 hppa_read_fp (int pid
)
2922 int flags
= read_register (FLAGS_REGNUM
);
2926 return (CORE_ADDR
) 0;
2929 /* This is the only site that may directly read_register () the FP
2930 register. All others must use deprecated_read_fp (). */
2931 return read_register (DEPRECATED_FP_REGNUM
);
2935 hppa_target_read_fp (void)
2937 return hppa_read_fp (PIDGET (inferior_ptid
));
2940 /* Get the PC from %r31 if currently in a syscall. Also mask out privilege
2944 hppa_target_read_pc (ptid_t ptid
)
2946 int flags
= read_register_pid (FLAGS_REGNUM
, ptid
);
2948 /* The following test does not belong here. It is OS-specific, and belongs
2950 /* Test SS_INSYSCALL */
2952 return read_register_pid (31, ptid
) & ~0x3;
2954 return read_register_pid (PC_REGNUM
, ptid
) & ~0x3;
2957 /* Write out the PC. If currently in a syscall, then also write the new
2958 PC value into %r31. */
2961 hppa_target_write_pc (CORE_ADDR v
, ptid_t ptid
)
2963 int flags
= read_register_pid (FLAGS_REGNUM
, ptid
);
2965 /* The following test does not belong here. It is OS-specific, and belongs
2967 /* If in a syscall, then set %r31. Also make sure to get the
2968 privilege bits set correctly. */
2969 /* Test SS_INSYSCALL */
2971 write_register_pid (31, v
| 0x3, ptid
);
2973 write_register_pid (PC_REGNUM
, v
, ptid
);
2974 write_register_pid (PCOQ_TAIL_REGNUM
, v
+ 4, ptid
);
2977 /* return the alignment of a type in bytes. Structures have the maximum
2978 alignment required by their fields. */
2981 hppa_alignof (struct type
*type
)
2983 int max_align
, align
, i
;
2984 CHECK_TYPEDEF (type
);
2985 switch (TYPE_CODE (type
))
2990 return TYPE_LENGTH (type
);
2991 case TYPE_CODE_ARRAY
:
2992 return hppa_alignof (TYPE_FIELD_TYPE (type
, 0));
2993 case TYPE_CODE_STRUCT
:
2994 case TYPE_CODE_UNION
:
2996 for (i
= 0; i
< TYPE_NFIELDS (type
); i
++)
2998 /* Bit fields have no real alignment. */
2999 /* if (!TYPE_FIELD_BITPOS (type, i)) */
3000 if (!TYPE_FIELD_BITSIZE (type
, i
)) /* elz: this should be bitsize */
3002 align
= hppa_alignof (TYPE_FIELD_TYPE (type
, i
));
3003 max_align
= max (max_align
, align
);
3012 /* Print the register regnum, or all registers if regnum is -1 */
3015 pa_do_registers_info (int regnum
, int fpregs
)
3017 char *raw_regs
= alloca (DEPRECATED_REGISTER_BYTES
);
3020 /* Make a copy of gdb's save area (may cause actual
3021 reads from the target). */
3022 for (i
= 0; i
< NUM_REGS
; i
++)
3023 frame_register_read (deprecated_selected_frame
, i
,
3024 raw_regs
+ DEPRECATED_REGISTER_BYTE (i
));
3027 pa_print_registers (raw_regs
, regnum
, fpregs
);
3028 else if (regnum
< FP4_REGNUM
)
3032 /* Why is the value not passed through "extract_signed_integer"
3033 as in "pa_print_registers" below? */
3034 pa_register_look_aside (raw_regs
, regnum
, ®_val
[0]);
3038 printf_unfiltered ("%s %lx\n", REGISTER_NAME (regnum
), reg_val
[1]);
3042 /* Fancy % formats to prevent leading zeros. */
3043 if (reg_val
[0] == 0)
3044 printf_unfiltered ("%s %lx\n", REGISTER_NAME (regnum
), reg_val
[1]);
3046 printf_unfiltered ("%s %lx%8.8lx\n", REGISTER_NAME (regnum
),
3047 reg_val
[0], reg_val
[1]);
3051 /* Note that real floating point values only start at
3052 FP4_REGNUM. FP0 and up are just status and error
3053 registers, which have integral (bit) values. */
3054 pa_print_fp_reg (regnum
);
3057 /********** new function ********************/
3059 pa_do_strcat_registers_info (int regnum
, int fpregs
, struct ui_file
*stream
,
3060 enum precision_type precision
)
3062 char *raw_regs
= alloca (DEPRECATED_REGISTER_BYTES
);
3065 /* Make a copy of gdb's save area (may cause actual
3066 reads from the target). */
3067 for (i
= 0; i
< NUM_REGS
; i
++)
3068 frame_register_read (deprecated_selected_frame
, i
,
3069 raw_regs
+ DEPRECATED_REGISTER_BYTE (i
));
3072 pa_strcat_registers (raw_regs
, regnum
, fpregs
, stream
);
3074 else if (regnum
< FP4_REGNUM
)
3078 /* Why is the value not passed through "extract_signed_integer"
3079 as in "pa_print_registers" below? */
3080 pa_register_look_aside (raw_regs
, regnum
, ®_val
[0]);
3084 fprintf_unfiltered (stream
, "%s %lx", REGISTER_NAME (regnum
), reg_val
[1]);
3088 /* Fancy % formats to prevent leading zeros. */
3089 if (reg_val
[0] == 0)
3090 fprintf_unfiltered (stream
, "%s %lx", REGISTER_NAME (regnum
),
3093 fprintf_unfiltered (stream
, "%s %lx%8.8lx", REGISTER_NAME (regnum
),
3094 reg_val
[0], reg_val
[1]);
3098 /* Note that real floating point values only start at
3099 FP4_REGNUM. FP0 and up are just status and error
3100 registers, which have integral (bit) values. */
3101 pa_strcat_fp_reg (regnum
, stream
, precision
);
3104 /* If this is a PA2.0 machine, fetch the real 64-bit register
3105 value. Otherwise use the info from gdb's saved register area.
3107 Note that reg_val is really expected to be an array of longs,
3108 with two elements. */
3110 pa_register_look_aside (char *raw_regs
, int regnum
, long *raw_val
)
3112 static int know_which
= 0; /* False */
3115 unsigned int offset
;
3120 char buf
[MAX_REGISTER_SIZE
];
3125 if (CPU_PA_RISC2_0
== sysconf (_SC_CPU_VERSION
))
3130 know_which
= 1; /* True */
3138 raw_val
[1] = *(long *) (raw_regs
+ DEPRECATED_REGISTER_BYTE (regnum
));
3142 /* Code below copied from hppah-nat.c, with fixes for wide
3143 registers, using different area of save_state, etc. */
3144 if (regnum
== FLAGS_REGNUM
|| regnum
>= FP0_REGNUM
||
3145 !HAVE_STRUCT_SAVE_STATE_T
|| !HAVE_STRUCT_MEMBER_SS_WIDE
)
3147 /* Use narrow regs area of save_state and default macro. */
3148 offset
= U_REGS_OFFSET
;
3149 regaddr
= register_addr (regnum
, offset
);
3154 /* Use wide regs area, and calculate registers as 8 bytes wide.
3156 We'd like to do this, but current version of "C" doesn't
3159 offset = offsetof(save_state_t, ss_wide);
3161 Note that to avoid "C" doing typed pointer arithmetic, we
3162 have to cast away the type in our offset calculation:
3163 otherwise we get an offset of 1! */
3165 /* NB: save_state_t is not available before HPUX 9.
3166 The ss_wide field is not available previous to HPUX 10.20,
3167 so to avoid compile-time warnings, we only compile this for
3168 PA 2.0 processors. This control path should only be followed
3169 if we're debugging a PA 2.0 processor, so this should not cause
3172 /* #if the following code out so that this file can still be
3173 compiled on older HPUX boxes (< 10.20) which don't have
3174 this structure/structure member. */
3175 #if HAVE_STRUCT_SAVE_STATE_T == 1 && HAVE_STRUCT_MEMBER_SS_WIDE == 1
3178 offset
= ((int) &temp
.ss_wide
) - ((int) &temp
);
3179 regaddr
= offset
+ regnum
* 8;
3184 for (i
= start
; i
< 2; i
++)
3187 raw_val
[i
] = call_ptrace (PT_RUREGS
, PIDGET (inferior_ptid
),
3188 (PTRACE_ARG3_TYPE
) regaddr
, 0);
3191 /* Warning, not error, in case we are attached; sometimes the
3192 kernel doesn't let us at the registers. */
3193 char *err
= safe_strerror (errno
);
3194 char *msg
= alloca (strlen (err
) + 128);
3195 sprintf (msg
, "reading register %s: %s", REGISTER_NAME (regnum
), err
);
3200 regaddr
+= sizeof (long);
3203 if (regnum
== PCOQ_HEAD_REGNUM
|| regnum
== PCOQ_TAIL_REGNUM
)
3204 raw_val
[1] &= ~0x3; /* I think we're masking out space bits */
3210 /* "Info all-reg" command */
3213 pa_print_registers (char *raw_regs
, int regnum
, int fpregs
)
3216 /* Alas, we are compiled so that "long long" is 32 bits */
3219 int rows
= 48, columns
= 2;
3221 for (i
= 0; i
< rows
; i
++)
3223 for (j
= 0; j
< columns
; j
++)
3225 /* We display registers in column-major order. */
3226 int regnum
= i
+ j
* rows
;
3228 /* Q: Why is the value passed through "extract_signed_integer",
3229 while above, in "pa_do_registers_info" it isn't?
3231 pa_register_look_aside (raw_regs
, regnum
, &raw_val
[0]);
3233 /* Even fancier % formats to prevent leading zeros
3234 and still maintain the output in columns. */
3237 /* Being big-endian, on this machine the low bits
3238 (the ones we want to look at) are in the second longword. */
3239 long_val
= extract_signed_integer (&raw_val
[1], 4);
3240 printf_filtered ("%10.10s: %8lx ",
3241 REGISTER_NAME (regnum
), long_val
);
3245 /* raw_val = extract_signed_integer(&raw_val, 8); */
3246 if (raw_val
[0] == 0)
3247 printf_filtered ("%10.10s: %8lx ",
3248 REGISTER_NAME (regnum
), raw_val
[1]);
3250 printf_filtered ("%10.10s: %8lx%8.8lx ",
3251 REGISTER_NAME (regnum
),
3252 raw_val
[0], raw_val
[1]);
3255 printf_unfiltered ("\n");
3259 for (i
= FP4_REGNUM
; i
< NUM_REGS
; i
++) /* FP4_REGNUM == 72 */
3260 pa_print_fp_reg (i
);
3263 /************* new function ******************/
3265 pa_strcat_registers (char *raw_regs
, int regnum
, int fpregs
,
3266 struct ui_file
*stream
)
3269 long raw_val
[2]; /* Alas, we are compiled so that "long long" is 32 bits */
3271 enum precision_type precision
;
3273 precision
= unspecified_precision
;
3275 for (i
= 0; i
< 18; i
++)
3277 for (j
= 0; j
< 4; j
++)
3279 /* Q: Why is the value passed through "extract_signed_integer",
3280 while above, in "pa_do_registers_info" it isn't?
3282 pa_register_look_aside (raw_regs
, i
+ (j
* 18), &raw_val
[0]);
3284 /* Even fancier % formats to prevent leading zeros
3285 and still maintain the output in columns. */
3288 /* Being big-endian, on this machine the low bits
3289 (the ones we want to look at) are in the second longword. */
3290 long_val
= extract_signed_integer (&raw_val
[1], 4);
3291 fprintf_filtered (stream
, "%8.8s: %8lx ",
3292 REGISTER_NAME (i
+ (j
* 18)), long_val
);
3296 /* raw_val = extract_signed_integer(&raw_val, 8); */
3297 if (raw_val
[0] == 0)
3298 fprintf_filtered (stream
, "%8.8s: %8lx ",
3299 REGISTER_NAME (i
+ (j
* 18)), raw_val
[1]);
3301 fprintf_filtered (stream
, "%8.8s: %8lx%8.8lx ",
3302 REGISTER_NAME (i
+ (j
* 18)), raw_val
[0],
3306 fprintf_unfiltered (stream
, "\n");
3310 for (i
= FP4_REGNUM
; i
< NUM_REGS
; i
++) /* FP4_REGNUM == 72 */
3311 pa_strcat_fp_reg (i
, stream
, precision
);
3315 pa_print_fp_reg (int i
)
3317 char raw_buffer
[MAX_REGISTER_SIZE
];
3318 char virtual_buffer
[MAX_REGISTER_SIZE
];
3320 /* Get 32bits of data. */
3321 frame_register_read (deprecated_selected_frame
, i
, raw_buffer
);
3323 /* Put it in the buffer. No conversions are ever necessary. */
3324 memcpy (virtual_buffer
, raw_buffer
, DEPRECATED_REGISTER_RAW_SIZE (i
));
3326 fputs_filtered (REGISTER_NAME (i
), gdb_stdout
);
3327 print_spaces_filtered (8 - strlen (REGISTER_NAME (i
)), gdb_stdout
);
3328 fputs_filtered ("(single precision) ", gdb_stdout
);
3330 val_print (DEPRECATED_REGISTER_VIRTUAL_TYPE (i
), virtual_buffer
, 0, 0, gdb_stdout
, 0,
3331 1, 0, Val_pretty_default
);
3332 printf_filtered ("\n");
3334 /* If "i" is even, then this register can also be a double-precision
3335 FP register. Dump it out as such. */
3338 /* Get the data in raw format for the 2nd half. */
3339 frame_register_read (deprecated_selected_frame
, i
+ 1, raw_buffer
);
3341 /* Copy it into the appropriate part of the virtual buffer. */
3342 memcpy (virtual_buffer
+ DEPRECATED_REGISTER_RAW_SIZE (i
), raw_buffer
,
3343 DEPRECATED_REGISTER_RAW_SIZE (i
));
3345 /* Dump it as a double. */
3346 fputs_filtered (REGISTER_NAME (i
), gdb_stdout
);
3347 print_spaces_filtered (8 - strlen (REGISTER_NAME (i
)), gdb_stdout
);
3348 fputs_filtered ("(double precision) ", gdb_stdout
);
3350 val_print (builtin_type_double
, virtual_buffer
, 0, 0, gdb_stdout
, 0,
3351 1, 0, Val_pretty_default
);
3352 printf_filtered ("\n");
3356 /*************** new function ***********************/
3358 pa_strcat_fp_reg (int i
, struct ui_file
*stream
, enum precision_type precision
)
3360 char raw_buffer
[MAX_REGISTER_SIZE
];
3361 char virtual_buffer
[MAX_REGISTER_SIZE
];
3363 fputs_filtered (REGISTER_NAME (i
), stream
);
3364 print_spaces_filtered (8 - strlen (REGISTER_NAME (i
)), stream
);
3366 /* Get 32bits of data. */
3367 frame_register_read (deprecated_selected_frame
, i
, raw_buffer
);
3369 /* Put it in the buffer. No conversions are ever necessary. */
3370 memcpy (virtual_buffer
, raw_buffer
, DEPRECATED_REGISTER_RAW_SIZE (i
));
3372 if (precision
== double_precision
&& (i
% 2) == 0)
3375 char raw_buf
[MAX_REGISTER_SIZE
];
3377 /* Get the data in raw format for the 2nd half. */
3378 frame_register_read (deprecated_selected_frame
, i
+ 1, raw_buf
);
3380 /* Copy it into the appropriate part of the virtual buffer. */
3381 memcpy (virtual_buffer
+ DEPRECATED_REGISTER_RAW_SIZE (i
), raw_buf
,
3382 DEPRECATED_REGISTER_RAW_SIZE (i
));
3384 val_print (builtin_type_double
, virtual_buffer
, 0, 0, stream
, 0,
3385 1, 0, Val_pretty_default
);
3390 val_print (DEPRECATED_REGISTER_VIRTUAL_TYPE (i
), virtual_buffer
, 0, 0, stream
, 0,
3391 1, 0, Val_pretty_default
);
3396 /* Return one if PC is in the call path of a trampoline, else return zero.
3398 Note we return one for *any* call trampoline (long-call, arg-reloc), not
3399 just shared library trampolines (import, export). */
3402 hppa_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
3404 struct minimal_symbol
*minsym
;
3405 struct unwind_table_entry
*u
;
3406 static CORE_ADDR dyncall
= 0;
3407 static CORE_ADDR sr4export
= 0;
3409 #ifdef GDB_TARGET_IS_HPPA_20W
3410 /* PA64 has a completely different stub/trampoline scheme. Is it
3411 better? Maybe. It's certainly harder to determine with any
3412 certainty that we are in a stub because we can not refer to the
3415 The heuristic is simple. Try to lookup the current PC value in th
3416 minimal symbol table. If that fails, then assume we are not in a
3419 Then see if the PC value falls within the section bounds for the
3420 section containing the minimal symbol we found in the first
3421 step. If it does, then assume we are not in a stub and return.
3423 Finally peek at the instructions to see if they look like a stub. */
3425 struct minimal_symbol
*minsym
;
3430 minsym
= lookup_minimal_symbol_by_pc (pc
);
3434 sec
= SYMBOL_BFD_SECTION (minsym
);
3436 if (bfd_get_section_vma (sec
->owner
, sec
) <= pc
3437 && pc
< (bfd_get_section_vma (sec
->owner
, sec
)
3438 + bfd_section_size (sec
->owner
, sec
)))
3441 /* We might be in a stub. Peek at the instructions. Stubs are 3
3442 instructions long. */
3443 insn
= read_memory_integer (pc
, 4);
3445 /* Find out where we think we are within the stub. */
3446 if ((insn
& 0xffffc00e) == 0x53610000)
3448 else if ((insn
& 0xffffffff) == 0xe820d000)
3450 else if ((insn
& 0xffffc00e) == 0x537b0000)
3455 /* Now verify each insn in the range looks like a stub instruction. */
3456 insn
= read_memory_integer (addr
, 4);
3457 if ((insn
& 0xffffc00e) != 0x53610000)
3460 /* Now verify each insn in the range looks like a stub instruction. */
3461 insn
= read_memory_integer (addr
+ 4, 4);
3462 if ((insn
& 0xffffffff) != 0xe820d000)
3465 /* Now verify each insn in the range looks like a stub instruction. */
3466 insn
= read_memory_integer (addr
+ 8, 4);
3467 if ((insn
& 0xffffc00e) != 0x537b0000)
3470 /* Looks like a stub. */
3475 /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a
3478 /* First see if PC is in one of the two C-library trampolines. */
3481 minsym
= lookup_minimal_symbol ("$$dyncall", NULL
, NULL
);
3483 dyncall
= SYMBOL_VALUE_ADDRESS (minsym
);
3490 minsym
= lookup_minimal_symbol ("_sr4export", NULL
, NULL
);
3492 sr4export
= SYMBOL_VALUE_ADDRESS (minsym
);
3497 if (pc
== dyncall
|| pc
== sr4export
)
3500 minsym
= lookup_minimal_symbol_by_pc (pc
);
3501 if (minsym
&& strcmp (DEPRECATED_SYMBOL_NAME (minsym
), ".stub") == 0)
3504 /* Get the unwind descriptor corresponding to PC, return zero
3505 if no unwind was found. */
3506 u
= find_unwind_entry (pc
);
3510 /* If this isn't a linker stub, then return now. */
3511 if (u
->stub_unwind
.stub_type
== 0)
3514 /* By definition a long-branch stub is a call stub. */
3515 if (u
->stub_unwind
.stub_type
== LONG_BRANCH
)
3518 /* The call and return path execute the same instructions within
3519 an IMPORT stub! So an IMPORT stub is both a call and return
3521 if (u
->stub_unwind
.stub_type
== IMPORT
)
3524 /* Parameter relocation stubs always have a call path and may have a
3526 if (u
->stub_unwind
.stub_type
== PARAMETER_RELOCATION
3527 || u
->stub_unwind
.stub_type
== EXPORT
)
3531 /* Search forward from the current PC until we hit a branch
3532 or the end of the stub. */
3533 for (addr
= pc
; addr
<= u
->region_end
; addr
+= 4)
3537 insn
= read_memory_integer (addr
, 4);
3539 /* Does it look like a bl? If so then it's the call path, if
3540 we find a bv or be first, then we're on the return path. */
3541 if ((insn
& 0xfc00e000) == 0xe8000000)
3543 else if ((insn
& 0xfc00e001) == 0xe800c000
3544 || (insn
& 0xfc000000) == 0xe0000000)
3548 /* Should never happen. */
3549 warning ("Unable to find branch in parameter relocation stub.\n");
3553 /* Unknown stub type. For now, just return zero. */
3557 /* Return one if PC is in the return path of a trampoline, else return zero.
3559 Note we return one for *any* call trampoline (long-call, arg-reloc), not
3560 just shared library trampolines (import, export). */
3563 hppa_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
3565 struct unwind_table_entry
*u
;
3567 /* Get the unwind descriptor corresponding to PC, return zero
3568 if no unwind was found. */
3569 u
= find_unwind_entry (pc
);
3573 /* If this isn't a linker stub or it's just a long branch stub, then
3575 if (u
->stub_unwind
.stub_type
== 0 || u
->stub_unwind
.stub_type
== LONG_BRANCH
)
3578 /* The call and return path execute the same instructions within
3579 an IMPORT stub! So an IMPORT stub is both a call and return
3581 if (u
->stub_unwind
.stub_type
== IMPORT
)
3584 /* Parameter relocation stubs always have a call path and may have a
3586 if (u
->stub_unwind
.stub_type
== PARAMETER_RELOCATION
3587 || u
->stub_unwind
.stub_type
== EXPORT
)
3591 /* Search forward from the current PC until we hit a branch
3592 or the end of the stub. */
3593 for (addr
= pc
; addr
<= u
->region_end
; addr
+= 4)
3597 insn
= read_memory_integer (addr
, 4);
3599 /* Does it look like a bl? If so then it's the call path, if
3600 we find a bv or be first, then we're on the return path. */
3601 if ((insn
& 0xfc00e000) == 0xe8000000)
3603 else if ((insn
& 0xfc00e001) == 0xe800c000
3604 || (insn
& 0xfc000000) == 0xe0000000)
3608 /* Should never happen. */
3609 warning ("Unable to find branch in parameter relocation stub.\n");
3613 /* Unknown stub type. For now, just return zero. */
3618 /* Figure out if PC is in a trampoline, and if so find out where
3619 the trampoline will jump to. If not in a trampoline, return zero.
3621 Simple code examination probably is not a good idea since the code
3622 sequences in trampolines can also appear in user code.
3624 We use unwinds and information from the minimal symbol table to
3625 determine when we're in a trampoline. This won't work for ELF
3626 (yet) since it doesn't create stub unwind entries. Whether or
3627 not ELF will create stub unwinds or normal unwinds for linker
3628 stubs is still being debated.
3630 This should handle simple calls through dyncall or sr4export,
3631 long calls, argument relocation stubs, and dyncall/sr4export
3632 calling an argument relocation stub. It even handles some stubs
3633 used in dynamic executables. */
3636 hppa_skip_trampoline_code (CORE_ADDR pc
)
3639 long prev_inst
, curr_inst
, loc
;
3640 static CORE_ADDR dyncall
= 0;
3641 static CORE_ADDR dyncall_external
= 0;
3642 static CORE_ADDR sr4export
= 0;
3643 struct minimal_symbol
*msym
;
3644 struct unwind_table_entry
*u
;
3646 /* FIXME XXX - dyncall and sr4export must be initialized whenever we get a
3651 msym
= lookup_minimal_symbol ("$$dyncall", NULL
, NULL
);
3653 dyncall
= SYMBOL_VALUE_ADDRESS (msym
);
3658 if (!dyncall_external
)
3660 msym
= lookup_minimal_symbol ("$$dyncall_external", NULL
, NULL
);
3662 dyncall_external
= SYMBOL_VALUE_ADDRESS (msym
);
3664 dyncall_external
= -1;
3669 msym
= lookup_minimal_symbol ("_sr4export", NULL
, NULL
);
3671 sr4export
= SYMBOL_VALUE_ADDRESS (msym
);
3676 /* Addresses passed to dyncall may *NOT* be the actual address
3677 of the function. So we may have to do something special. */
3680 pc
= (CORE_ADDR
) read_register (22);
3682 /* If bit 30 (counting from the left) is on, then pc is the address of
3683 the PLT entry for this function, not the address of the function
3684 itself. Bit 31 has meaning too, but only for MPE. */
3686 pc
= (CORE_ADDR
) read_memory_integer (pc
& ~0x3, TARGET_PTR_BIT
/ 8);
3688 if (pc
== dyncall_external
)
3690 pc
= (CORE_ADDR
) read_register (22);
3691 pc
= (CORE_ADDR
) read_memory_integer (pc
& ~0x3, TARGET_PTR_BIT
/ 8);
3693 else if (pc
== sr4export
)
3694 pc
= (CORE_ADDR
) (read_register (22));
3696 /* Get the unwind descriptor corresponding to PC, return zero
3697 if no unwind was found. */
3698 u
= find_unwind_entry (pc
);
3702 /* If this isn't a linker stub, then return now. */
3703 /* elz: attention here! (FIXME) because of a compiler/linker
3704 error, some stubs which should have a non zero stub_unwind.stub_type
3705 have unfortunately a value of zero. So this function would return here
3706 as if we were not in a trampoline. To fix this, we go look at the partial
3707 symbol information, which reports this guy as a stub.
3708 (FIXME): Unfortunately, we are not that lucky: it turns out that the
3709 partial symbol information is also wrong sometimes. This is because
3710 when it is entered (somread.c::som_symtab_read()) it can happen that
3711 if the type of the symbol (from the som) is Entry, and the symbol is
3712 in a shared library, then it can also be a trampoline. This would
3713 be OK, except that I believe the way they decide if we are ina shared library
3714 does not work. SOOOO..., even if we have a regular function w/o trampolines
3715 its minimal symbol can be assigned type mst_solib_trampoline.
3716 Also, if we find that the symbol is a real stub, then we fix the unwind
3717 descriptor, and define the stub type to be EXPORT.
3718 Hopefully this is correct most of the times. */
3719 if (u
->stub_unwind
.stub_type
== 0)
3722 /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed
3723 we can delete all the code which appears between the lines */
3724 /*--------------------------------------------------------------------------*/
3725 msym
= lookup_minimal_symbol_by_pc (pc
);
3727 if (msym
== NULL
|| MSYMBOL_TYPE (msym
) != mst_solib_trampoline
)
3728 return orig_pc
== pc
? 0 : pc
& ~0x3;
3730 else if (msym
!= NULL
&& MSYMBOL_TYPE (msym
) == mst_solib_trampoline
)
3732 struct objfile
*objfile
;
3733 struct minimal_symbol
*msymbol
;
3734 int function_found
= 0;
3736 /* go look if there is another minimal symbol with the same name as
3737 this one, but with type mst_text. This would happen if the msym
3738 is an actual trampoline, in which case there would be another
3739 symbol with the same name corresponding to the real function */
3741 ALL_MSYMBOLS (objfile
, msymbol
)
3743 if (MSYMBOL_TYPE (msymbol
) == mst_text
3744 && DEPRECATED_STREQ (DEPRECATED_SYMBOL_NAME (msymbol
), DEPRECATED_SYMBOL_NAME (msym
)))
3752 /* the type of msym is correct (mst_solib_trampoline), but
3753 the unwind info is wrong, so set it to the correct value */
3754 u
->stub_unwind
.stub_type
= EXPORT
;
3756 /* the stub type info in the unwind is correct (this is not a
3757 trampoline), but the msym type information is wrong, it
3758 should be mst_text. So we need to fix the msym, and also
3759 get out of this function */
3761 MSYMBOL_TYPE (msym
) = mst_text
;
3762 return orig_pc
== pc
? 0 : pc
& ~0x3;
3766 /*--------------------------------------------------------------------------*/
3769 /* It's a stub. Search for a branch and figure out where it goes.
3770 Note we have to handle multi insn branch sequences like ldil;ble.
3771 Most (all?) other branches can be determined by examining the contents
3772 of certain registers and the stack. */
3779 /* Make sure we haven't walked outside the range of this stub. */
3780 if (u
!= find_unwind_entry (loc
))
3782 warning ("Unable to find branch in linker stub");
3783 return orig_pc
== pc
? 0 : pc
& ~0x3;
3786 prev_inst
= curr_inst
;
3787 curr_inst
= read_memory_integer (loc
, 4);
3789 /* Does it look like a branch external using %r1? Then it's the
3790 branch from the stub to the actual function. */
3791 if ((curr_inst
& 0xffe0e000) == 0xe0202000)
3793 /* Yup. See if the previous instruction loaded
3794 a value into %r1. If so compute and return the jump address. */
3795 if ((prev_inst
& 0xffe00000) == 0x20200000)
3796 return (extract_21 (prev_inst
) + extract_17 (curr_inst
)) & ~0x3;
3799 warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1).");
3800 return orig_pc
== pc
? 0 : pc
& ~0x3;
3804 /* Does it look like a be 0(sr0,%r21)? OR
3805 Does it look like a be, n 0(sr0,%r21)? OR
3806 Does it look like a bve (r21)? (this is on PA2.0)
3807 Does it look like a bve, n(r21)? (this is also on PA2.0)
3808 That's the branch from an
3809 import stub to an export stub.
3811 It is impossible to determine the target of the branch via
3812 simple examination of instructions and/or data (consider
3813 that the address in the plabel may be the address of the
3814 bind-on-reference routine in the dynamic loader).
3816 So we have try an alternative approach.
3818 Get the name of the symbol at our current location; it should
3819 be a stub symbol with the same name as the symbol in the
3822 Then lookup a minimal symbol with the same name; we should
3823 get the minimal symbol for the target routine in the shared
3824 library as those take precedence of import/export stubs. */
3825 if ((curr_inst
== 0xe2a00000) ||
3826 (curr_inst
== 0xe2a00002) ||
3827 (curr_inst
== 0xeaa0d000) ||
3828 (curr_inst
== 0xeaa0d002))
3830 struct minimal_symbol
*stubsym
, *libsym
;
3832 stubsym
= lookup_minimal_symbol_by_pc (loc
);
3833 if (stubsym
== NULL
)
3835 warning ("Unable to find symbol for 0x%lx", loc
);
3836 return orig_pc
== pc
? 0 : pc
& ~0x3;
3839 libsym
= lookup_minimal_symbol (DEPRECATED_SYMBOL_NAME (stubsym
), NULL
, NULL
);
3842 warning ("Unable to find library symbol for %s\n",
3843 DEPRECATED_SYMBOL_NAME (stubsym
));
3844 return orig_pc
== pc
? 0 : pc
& ~0x3;
3847 return SYMBOL_VALUE (libsym
);
3850 /* Does it look like bl X,%rp or bl X,%r0? Another way to do a
3851 branch from the stub to the actual function. */
3853 else if ((curr_inst
& 0xffe0e000) == 0xe8400000
3854 || (curr_inst
& 0xffe0e000) == 0xe8000000
3855 || (curr_inst
& 0xffe0e000) == 0xe800A000)
3856 return (loc
+ extract_17 (curr_inst
) + 8) & ~0x3;
3858 /* Does it look like bv (rp)? Note this depends on the
3859 current stack pointer being the same as the stack
3860 pointer in the stub itself! This is a branch on from the
3861 stub back to the original caller. */
3862 /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */
3863 else if ((curr_inst
& 0xffe0f000) == 0xe840c000)
3865 /* Yup. See if the previous instruction loaded
3867 if (prev_inst
== 0x4bc23ff1)
3868 return (read_memory_integer
3869 (read_register (SP_REGNUM
) - 8, 4)) & ~0x3;
3872 warning ("Unable to find restore of %%rp before bv (%%rp).");
3873 return orig_pc
== pc
? 0 : pc
& ~0x3;
3877 /* elz: added this case to capture the new instruction
3878 at the end of the return part of an export stub used by
3879 the PA2.0: BVE, n (rp) */
3880 else if ((curr_inst
& 0xffe0f000) == 0xe840d000)
3882 return (read_memory_integer
3883 (read_register (SP_REGNUM
) - 24, TARGET_PTR_BIT
/ 8)) & ~0x3;
3886 /* What about be,n 0(sr0,%rp)? It's just another way we return to
3887 the original caller from the stub. Used in dynamic executables. */
3888 else if (curr_inst
== 0xe0400002)
3890 /* The value we jump to is sitting in sp - 24. But that's
3891 loaded several instructions before the be instruction.
3892 I guess we could check for the previous instruction being
3893 mtsp %r1,%sr0 if we want to do sanity checking. */
3894 return (read_memory_integer
3895 (read_register (SP_REGNUM
) - 24, TARGET_PTR_BIT
/ 8)) & ~0x3;
3898 /* Haven't found the branch yet, but we're still in the stub.
3905 /* For the given instruction (INST), return any adjustment it makes
3906 to the stack pointer or zero for no adjustment.
3908 This only handles instructions commonly found in prologues. */
3911 prologue_inst_adjust_sp (unsigned long inst
)
3913 /* This must persist across calls. */
3914 static int save_high21
;
3916 /* The most common way to perform a stack adjustment ldo X(sp),sp */
3917 if ((inst
& 0xffffc000) == 0x37de0000)
3918 return extract_14 (inst
);
3921 if ((inst
& 0xffe00000) == 0x6fc00000)
3922 return extract_14 (inst
);
3924 /* std,ma X,D(sp) */
3925 if ((inst
& 0xffe00008) == 0x73c00008)
3926 return (inst
& 0x1 ? -1 << 13 : 0) | (((inst
>> 4) & 0x3ff) << 3);
3928 /* addil high21,%r1; ldo low11,(%r1),%r30)
3929 save high bits in save_high21 for later use. */
3930 if ((inst
& 0xffe00000) == 0x28200000)
3932 save_high21
= extract_21 (inst
);
3936 if ((inst
& 0xffff0000) == 0x343e0000)
3937 return save_high21
+ extract_14 (inst
);
3939 /* fstws as used by the HP compilers. */
3940 if ((inst
& 0xffffffe0) == 0x2fd01220)
3941 return extract_5_load (inst
);
3943 /* No adjustment. */
3947 /* Return nonzero if INST is a branch of some kind, else return zero. */
3950 is_branch (unsigned long inst
)
3979 /* Return the register number for a GR which is saved by INST or
3980 zero it INST does not save a GR. */
3983 inst_saves_gr (unsigned long inst
)
3985 /* Does it look like a stw? */
3986 if ((inst
>> 26) == 0x1a || (inst
>> 26) == 0x1b
3987 || (inst
>> 26) == 0x1f
3988 || ((inst
>> 26) == 0x1f
3989 && ((inst
>> 6) == 0xa)))
3990 return extract_5R_store (inst
);
3992 /* Does it look like a std? */
3993 if ((inst
>> 26) == 0x1c
3994 || ((inst
>> 26) == 0x03
3995 && ((inst
>> 6) & 0xf) == 0xb))
3996 return extract_5R_store (inst
);
3998 /* Does it look like a stwm? GCC & HPC may use this in prologues. */
3999 if ((inst
>> 26) == 0x1b)
4000 return extract_5R_store (inst
);
4002 /* Does it look like sth or stb? HPC versions 9.0 and later use these
4004 if ((inst
>> 26) == 0x19 || (inst
>> 26) == 0x18
4005 || ((inst
>> 26) == 0x3
4006 && (((inst
>> 6) & 0xf) == 0x8
4007 || (inst
>> 6) & 0xf) == 0x9))
4008 return extract_5R_store (inst
);
4013 /* Return the register number for a FR which is saved by INST or
4014 zero it INST does not save a FR.
4016 Note we only care about full 64bit register stores (that's the only
4017 kind of stores the prologue will use).
4019 FIXME: What about argument stores with the HP compiler in ANSI mode? */
4022 inst_saves_fr (unsigned long inst
)
4024 /* is this an FSTD ? */
4025 if ((inst
& 0xfc00dfc0) == 0x2c001200)
4026 return extract_5r_store (inst
);
4027 if ((inst
& 0xfc000002) == 0x70000002)
4028 return extract_5R_store (inst
);
4029 /* is this an FSTW ? */
4030 if ((inst
& 0xfc00df80) == 0x24001200)
4031 return extract_5r_store (inst
);
4032 if ((inst
& 0xfc000002) == 0x7c000000)
4033 return extract_5R_store (inst
);
4037 /* Advance PC across any function entry prologue instructions
4038 to reach some "real" code.
4040 Use information in the unwind table to determine what exactly should
4041 be in the prologue. */
4045 skip_prologue_hard_way (CORE_ADDR pc
)
4048 CORE_ADDR orig_pc
= pc
;
4049 unsigned long inst
, stack_remaining
, save_gr
, save_fr
, save_rp
, save_sp
;
4050 unsigned long args_stored
, status
, i
, restart_gr
, restart_fr
;
4051 struct unwind_table_entry
*u
;
4057 u
= find_unwind_entry (pc
);
4061 /* If we are not at the beginning of a function, then return now. */
4062 if ((pc
& ~0x3) != u
->region_start
)
4065 /* This is how much of a frame adjustment we need to account for. */
4066 stack_remaining
= u
->Total_frame_size
<< 3;
4068 /* Magic register saves we want to know about. */
4069 save_rp
= u
->Save_RP
;
4070 save_sp
= u
->Save_SP
;
4072 /* An indication that args may be stored into the stack. Unfortunately
4073 the HPUX compilers tend to set this in cases where no args were
4077 /* Turn the Entry_GR field into a bitmask. */
4079 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
4081 /* Frame pointer gets saved into a special location. */
4082 if (u
->Save_SP
&& i
== DEPRECATED_FP_REGNUM
)
4085 save_gr
|= (1 << i
);
4087 save_gr
&= ~restart_gr
;
4089 /* Turn the Entry_FR field into a bitmask too. */
4091 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
4092 save_fr
|= (1 << i
);
4093 save_fr
&= ~restart_fr
;
4095 /* Loop until we find everything of interest or hit a branch.
4097 For unoptimized GCC code and for any HP CC code this will never ever
4098 examine any user instructions.
4100 For optimzied GCC code we're faced with problems. GCC will schedule
4101 its prologue and make prologue instructions available for delay slot
4102 filling. The end result is user code gets mixed in with the prologue
4103 and a prologue instruction may be in the delay slot of the first branch
4106 Some unexpected things are expected with debugging optimized code, so
4107 we allow this routine to walk past user instructions in optimized
4109 while (save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0
4112 unsigned int reg_num
;
4113 unsigned long old_stack_remaining
, old_save_gr
, old_save_fr
;
4114 unsigned long old_save_rp
, old_save_sp
, next_inst
;
4116 /* Save copies of all the triggers so we can compare them later
4118 old_save_gr
= save_gr
;
4119 old_save_fr
= save_fr
;
4120 old_save_rp
= save_rp
;
4121 old_save_sp
= save_sp
;
4122 old_stack_remaining
= stack_remaining
;
4124 status
= target_read_memory (pc
, buf
, 4);
4125 inst
= extract_unsigned_integer (buf
, 4);
4131 /* Note the interesting effects of this instruction. */
4132 stack_remaining
-= prologue_inst_adjust_sp (inst
);
4134 /* There are limited ways to store the return pointer into the
4136 if (inst
== 0x6bc23fd9 || inst
== 0x0fc212c1)
4139 /* These are the only ways we save SP into the stack. At this time
4140 the HP compilers never bother to save SP into the stack. */
4141 if ((inst
& 0xffffc000) == 0x6fc10000
4142 || (inst
& 0xffffc00c) == 0x73c10008)
4145 /* Are we loading some register with an offset from the argument
4147 if ((inst
& 0xffe00000) == 0x37a00000
4148 || (inst
& 0xffffffe0) == 0x081d0240)
4154 /* Account for general and floating-point register saves. */
4155 reg_num
= inst_saves_gr (inst
);
4156 save_gr
&= ~(1 << reg_num
);
4158 /* Ugh. Also account for argument stores into the stack.
4159 Unfortunately args_stored only tells us that some arguments
4160 where stored into the stack. Not how many or what kind!
4162 This is a kludge as on the HP compiler sets this bit and it
4163 never does prologue scheduling. So once we see one, skip past
4164 all of them. We have similar code for the fp arg stores below.
4166 FIXME. Can still die if we have a mix of GR and FR argument
4168 if (reg_num
>= (TARGET_PTR_BIT
== 64 ? 19 : 23) && reg_num
<= 26)
4170 while (reg_num
>= (TARGET_PTR_BIT
== 64 ? 19 : 23) && reg_num
<= 26)
4173 status
= target_read_memory (pc
, buf
, 4);
4174 inst
= extract_unsigned_integer (buf
, 4);
4177 reg_num
= inst_saves_gr (inst
);
4183 reg_num
= inst_saves_fr (inst
);
4184 save_fr
&= ~(1 << reg_num
);
4186 status
= target_read_memory (pc
+ 4, buf
, 4);
4187 next_inst
= extract_unsigned_integer (buf
, 4);
4193 /* We've got to be read to handle the ldo before the fp register
4195 if ((inst
& 0xfc000000) == 0x34000000
4196 && inst_saves_fr (next_inst
) >= 4
4197 && inst_saves_fr (next_inst
) <= (TARGET_PTR_BIT
== 64 ? 11 : 7))
4199 /* So we drop into the code below in a reasonable state. */
4200 reg_num
= inst_saves_fr (next_inst
);
4204 /* Ugh. Also account for argument stores into the stack.
4205 This is a kludge as on the HP compiler sets this bit and it
4206 never does prologue scheduling. So once we see one, skip past
4208 if (reg_num
>= 4 && reg_num
<= (TARGET_PTR_BIT
== 64 ? 11 : 7))
4210 while (reg_num
>= 4 && reg_num
<= (TARGET_PTR_BIT
== 64 ? 11 : 7))
4213 status
= target_read_memory (pc
, buf
, 4);
4214 inst
= extract_unsigned_integer (buf
, 4);
4217 if ((inst
& 0xfc000000) != 0x34000000)
4219 status
= target_read_memory (pc
+ 4, buf
, 4);
4220 next_inst
= extract_unsigned_integer (buf
, 4);
4223 reg_num
= inst_saves_fr (next_inst
);
4229 /* Quit if we hit any kind of branch. This can happen if a prologue
4230 instruction is in the delay slot of the first call/branch. */
4231 if (is_branch (inst
))
4234 /* What a crock. The HP compilers set args_stored even if no
4235 arguments were stored into the stack (boo hiss). This could
4236 cause this code to then skip a bunch of user insns (up to the
4239 To combat this we try to identify when args_stored was bogusly
4240 set and clear it. We only do this when args_stored is nonzero,
4241 all other resources are accounted for, and nothing changed on
4244 && !(save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0)
4245 && old_save_gr
== save_gr
&& old_save_fr
== save_fr
4246 && old_save_rp
== save_rp
&& old_save_sp
== save_sp
4247 && old_stack_remaining
== stack_remaining
)
4254 /* We've got a tenative location for the end of the prologue. However
4255 because of limitations in the unwind descriptor mechanism we may
4256 have went too far into user code looking for the save of a register
4257 that does not exist. So, if there registers we expected to be saved
4258 but never were, mask them out and restart.
4260 This should only happen in optimized code, and should be very rare. */
4261 if (save_gr
|| (save_fr
&& !(restart_fr
|| restart_gr
)))
4264 restart_gr
= save_gr
;
4265 restart_fr
= save_fr
;
4273 /* Return the address of the PC after the last prologue instruction if
4274 we can determine it from the debug symbols. Else return zero. */
4277 after_prologue (CORE_ADDR pc
)
4279 struct symtab_and_line sal
;
4280 CORE_ADDR func_addr
, func_end
;
4283 /* If we can not find the symbol in the partial symbol table, then
4284 there is no hope we can determine the function's start address
4286 if (!find_pc_partial_function (pc
, NULL
, &func_addr
, &func_end
))
4289 /* Get the line associated with FUNC_ADDR. */
4290 sal
= find_pc_line (func_addr
, 0);
4292 /* There are only two cases to consider. First, the end of the source line
4293 is within the function bounds. In that case we return the end of the
4294 source line. Second is the end of the source line extends beyond the
4295 bounds of the current function. We need to use the slow code to
4296 examine instructions in that case.
4298 Anything else is simply a bug elsewhere. Fixing it here is absolutely
4299 the wrong thing to do. In fact, it should be entirely possible for this
4300 function to always return zero since the slow instruction scanning code
4301 is supposed to *always* work. If it does not, then it is a bug. */
4302 if (sal
.end
< func_end
)
4308 /* To skip prologues, I use this predicate. Returns either PC itself
4309 if the code at PC does not look like a function prologue; otherwise
4310 returns an address that (if we're lucky) follows the prologue. If
4311 LENIENT, then we must skip everything which is involved in setting
4312 up the frame (it's OK to skip more, just so long as we don't skip
4313 anything which might clobber the registers which are being saved.
4314 Currently we must not skip more on the alpha, but we might the lenient
4318 hppa_skip_prologue (CORE_ADDR pc
)
4322 CORE_ADDR post_prologue_pc
;
4325 /* See if we can determine the end of the prologue via the symbol table.
4326 If so, then return either PC, or the PC after the prologue, whichever
4329 post_prologue_pc
= after_prologue (pc
);
4331 /* If after_prologue returned a useful address, then use it. Else
4332 fall back on the instruction skipping code.
4334 Some folks have claimed this causes problems because the breakpoint
4335 may be the first instruction of the prologue. If that happens, then
4336 the instruction skipping code has a bug that needs to be fixed. */
4337 if (post_prologue_pc
!= 0)
4338 return max (pc
, post_prologue_pc
);
4340 return (skip_prologue_hard_way (pc
));
4343 /* Put here the code to store, into the SAVED_REGS, the addresses of
4344 the saved registers of frame described by FRAME_INFO. This
4345 includes special registers such as pc and fp saved in special ways
4346 in the stack frame. sp is even more special: the address we return
4347 for it IS the sp for the next frame. */
4350 hppa_frame_find_saved_regs (struct frame_info
*frame_info
,
4351 CORE_ADDR frame_saved_regs
[])
4354 struct unwind_table_entry
*u
;
4355 unsigned long inst
, stack_remaining
, save_gr
, save_fr
, save_rp
, save_sp
;
4359 int final_iteration
;
4361 /* Zero out everything. */
4362 memset (frame_saved_regs
, '\0', SIZEOF_FRAME_SAVED_REGS
);
4364 /* Call dummy frames always look the same, so there's no need to
4365 examine the dummy code to determine locations of saved registers;
4366 instead, let find_dummy_frame_regs fill in the correct offsets
4367 for the saved registers. */
4368 if ((get_frame_pc (frame_info
) >= get_frame_base (frame_info
)
4369 && (get_frame_pc (frame_info
)
4370 <= (get_frame_base (frame_info
)
4371 /* A call dummy is sized in words, but it is actually a
4372 series of instructions. Account for that scaling
4374 + ((DEPRECATED_REGISTER_SIZE
/ INSTRUCTION_SIZE
)
4375 * DEPRECATED_CALL_DUMMY_LENGTH
)
4376 /* Similarly we have to account for 64bit wide register
4378 + (32 * DEPRECATED_REGISTER_SIZE
)
4379 /* We always consider FP regs 8 bytes long. */
4380 + (NUM_REGS
- FP0_REGNUM
) * 8
4381 /* Similarly we have to account for 64bit wide register
4383 + (6 * DEPRECATED_REGISTER_SIZE
)))))
4384 find_dummy_frame_regs (frame_info
, frame_saved_regs
);
4386 /* Interrupt handlers are special too. They lay out the register
4387 state in the exact same order as the register numbers in GDB. */
4388 if (pc_in_interrupt_handler (get_frame_pc (frame_info
)))
4390 for (i
= 0; i
< NUM_REGS
; i
++)
4392 /* SP is a little special. */
4394 frame_saved_regs
[SP_REGNUM
]
4395 = read_memory_integer (get_frame_base (frame_info
) + SP_REGNUM
* 4,
4396 TARGET_PTR_BIT
/ 8);
4398 frame_saved_regs
[i
] = get_frame_base (frame_info
) + i
* 4;
4403 #ifdef FRAME_FIND_SAVED_REGS_IN_SIGTRAMP
4404 /* Handle signal handler callers. */
4405 if ((get_frame_type (frame_info
) == SIGTRAMP_FRAME
))
4407 FRAME_FIND_SAVED_REGS_IN_SIGTRAMP (frame_info
, frame_saved_regs
);
4412 /* Get the starting address of the function referred to by the PC
4414 pc
= get_frame_func (frame_info
);
4417 u
= find_unwind_entry (pc
);
4421 /* This is how much of a frame adjustment we need to account for. */
4422 stack_remaining
= u
->Total_frame_size
<< 3;
4424 /* Magic register saves we want to know about. */
4425 save_rp
= u
->Save_RP
;
4426 save_sp
= u
->Save_SP
;
4428 /* Turn the Entry_GR field into a bitmask. */
4430 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
4432 /* Frame pointer gets saved into a special location. */
4433 if (u
->Save_SP
&& i
== DEPRECATED_FP_REGNUM
)
4436 save_gr
|= (1 << i
);
4439 /* Turn the Entry_FR field into a bitmask too. */
4441 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
4442 save_fr
|= (1 << i
);
4444 /* The frame always represents the value of %sp at entry to the
4445 current function (and is thus equivalent to the "saved" stack
4447 frame_saved_regs
[SP_REGNUM
] = get_frame_base (frame_info
);
4449 /* Loop until we find everything of interest or hit a branch.
4451 For unoptimized GCC code and for any HP CC code this will never ever
4452 examine any user instructions.
4454 For optimized GCC code we're faced with problems. GCC will schedule
4455 its prologue and make prologue instructions available for delay slot
4456 filling. The end result is user code gets mixed in with the prologue
4457 and a prologue instruction may be in the delay slot of the first branch
4460 Some unexpected things are expected with debugging optimized code, so
4461 we allow this routine to walk past user instructions in optimized
4463 final_iteration
= 0;
4464 while ((save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0)
4465 && pc
<= get_frame_pc (frame_info
))
4467 status
= target_read_memory (pc
, buf
, 4);
4468 inst
= extract_unsigned_integer (buf
, 4);
4474 /* Note the interesting effects of this instruction. */
4475 stack_remaining
-= prologue_inst_adjust_sp (inst
);
4477 /* There are limited ways to store the return pointer into the
4479 if (inst
== 0x6bc23fd9) /* stw rp,-0x14(sr0,sp) */
4482 frame_saved_regs
[RP_REGNUM
] = get_frame_base (frame_info
) - 20;
4484 else if (inst
== 0x0fc212c1) /* std rp,-0x10(sr0,sp) */
4487 frame_saved_regs
[RP_REGNUM
] = get_frame_base (frame_info
) - 16;
4490 /* Note if we saved SP into the stack. This also happens to indicate
4491 the location of the saved frame pointer. */
4492 if ( (inst
& 0xffffc000) == 0x6fc10000 /* stw,ma r1,N(sr0,sp) */
4493 || (inst
& 0xffffc00c) == 0x73c10008) /* std,ma r1,N(sr0,sp) */
4495 frame_saved_regs
[DEPRECATED_FP_REGNUM
] = get_frame_base (frame_info
);
4499 /* Account for general and floating-point register saves. */
4500 reg
= inst_saves_gr (inst
);
4501 if (reg
>= 3 && reg
<= 18
4502 && (!u
->Save_SP
|| reg
!= DEPRECATED_FP_REGNUM
))
4504 save_gr
&= ~(1 << reg
);
4506 /* stwm with a positive displacement is a *post modify*. */
4507 if ((inst
>> 26) == 0x1b
4508 && extract_14 (inst
) >= 0)
4509 frame_saved_regs
[reg
] = get_frame_base (frame_info
);
4510 /* A std has explicit post_modify forms. */
4511 else if ((inst
& 0xfc00000c) == 0x70000008)
4512 frame_saved_regs
[reg
] = get_frame_base (frame_info
);
4517 if ((inst
>> 26) == 0x1c)
4518 offset
= (inst
& 0x1 ? -1 << 13 : 0) | (((inst
>> 4) & 0x3ff) << 3);
4519 else if ((inst
>> 26) == 0x03)
4520 offset
= low_sign_extend (inst
& 0x1f, 5);
4522 offset
= extract_14 (inst
);
4524 /* Handle code with and without frame pointers. */
4526 frame_saved_regs
[reg
]
4527 = get_frame_base (frame_info
) + offset
;
4529 frame_saved_regs
[reg
]
4530 = (get_frame_base (frame_info
) + (u
->Total_frame_size
<< 3)
4536 /* GCC handles callee saved FP regs a little differently.
4538 It emits an instruction to put the value of the start of
4539 the FP store area into %r1. It then uses fstds,ma with
4540 a basereg of %r1 for the stores.
4542 HP CC emits them at the current stack pointer modifying
4543 the stack pointer as it stores each register. */
4545 /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */
4546 if ((inst
& 0xffffc000) == 0x34610000
4547 || (inst
& 0xffffc000) == 0x37c10000)
4548 fp_loc
= extract_14 (inst
);
4550 reg
= inst_saves_fr (inst
);
4551 if (reg
>= 12 && reg
<= 21)
4553 /* Note +4 braindamage below is necessary because the FP status
4554 registers are internally 8 registers rather than the expected
4556 save_fr
&= ~(1 << reg
);
4559 /* 1st HP CC FP register store. After this instruction
4560 we've set enough state that the GCC and HPCC code are
4561 both handled in the same manner. */
4562 frame_saved_regs
[reg
+ FP4_REGNUM
+ 4] = get_frame_base (frame_info
);
4567 frame_saved_regs
[reg
+ FP0_REGNUM
+ 4]
4568 = get_frame_base (frame_info
) + fp_loc
;
4573 /* Quit if we hit any kind of branch the previous iteration. */
4574 if (final_iteration
)
4577 /* We want to look precisely one instruction beyond the branch
4578 if we have not found everything yet. */
4579 if (is_branch (inst
))
4580 final_iteration
= 1;
4587 /* XXX - deprecated. This is a compatibility function for targets
4588 that do not yet implement DEPRECATED_FRAME_INIT_SAVED_REGS. */
4589 /* Find the addresses in which registers are saved in FRAME. */
4592 hppa_frame_init_saved_regs (struct frame_info
*frame
)
4594 if (deprecated_get_frame_saved_regs (frame
) == NULL
)
4595 frame_saved_regs_zalloc (frame
);
4596 hppa_frame_find_saved_regs (frame
, deprecated_get_frame_saved_regs (frame
));
4599 struct hppa_frame_cache
4602 struct trad_frame_saved_reg
*saved_regs
;
4605 static struct hppa_frame_cache
*
4606 hppa_frame_cache (struct frame_info
*next_frame
, void **this_cache
)
4608 struct hppa_frame_cache
*cache
;
4613 struct unwind_table_entry
*u
;
4616 if ((*this_cache
) != NULL
)
4617 return (*this_cache
);
4618 cache
= FRAME_OBSTACK_ZALLOC (struct hppa_frame_cache
);
4619 (*this_cache
) = cache
;
4620 cache
->saved_regs
= trad_frame_alloc_saved_regs (next_frame
);
4623 u
= find_unwind_entry (frame_func_unwind (next_frame
));
4627 /* Turn the Entry_GR field into a bitmask. */
4629 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
4631 /* Frame pointer gets saved into a special location. */
4632 if (u
->Save_SP
&& i
== DEPRECATED_FP_REGNUM
)
4635 saved_gr_mask
|= (1 << i
);
4638 /* Turn the Entry_FR field into a bitmask too. */
4640 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
4641 saved_fr_mask
|= (1 << i
);
4643 /* Loop until we find everything of interest or hit a branch.
4645 For unoptimized GCC code and for any HP CC code this will never ever
4646 examine any user instructions.
4648 For optimized GCC code we're faced with problems. GCC will schedule
4649 its prologue and make prologue instructions available for delay slot
4650 filling. The end result is user code gets mixed in with the prologue
4651 and a prologue instruction may be in the delay slot of the first branch
4654 Some unexpected things are expected with debugging optimized code, so
4655 we allow this routine to walk past user instructions in optimized
4658 int final_iteration
= 0;
4660 CORE_ADDR end_pc
= skip_prologue_using_sal (pc
);
4661 int looking_for_sp
= u
->Save_SP
;
4662 int looking_for_rp
= u
->Save_RP
;
4665 end_pc
= frame_pc_unwind (next_frame
);
4667 for (pc
= frame_func_unwind (next_frame
);
4668 ((saved_gr_mask
|| saved_fr_mask
4669 || looking_for_sp
|| looking_for_rp
4670 || frame_size
< (u
->Total_frame_size
<< 3))
4676 long status
= target_read_memory (pc
, buf4
, sizeof buf4
);
4677 long inst
= extract_unsigned_integer (buf4
, sizeof buf4
);
4679 /* Note the interesting effects of this instruction. */
4680 frame_size
+= prologue_inst_adjust_sp (inst
);
4682 /* There are limited ways to store the return pointer into the
4684 if (inst
== 0x6bc23fd9) /* stw rp,-0x14(sr0,sp) */
4687 cache
->saved_regs
[RP_REGNUM
].addr
= -20;
4689 else if (inst
== 0x0fc212c1) /* std rp,-0x10(sr0,sp) */
4692 cache
->saved_regs
[RP_REGNUM
].addr
= -16;
4695 /* Check to see if we saved SP into the stack. This also
4696 happens to indicate the location of the saved frame
4698 if ((inst
& 0xffffc000) == 0x6fc10000 /* stw,ma r1,N(sr0,sp) */
4699 || (inst
& 0xffffc00c) == 0x73c10008) /* std,ma r1,N(sr0,sp) */
4702 cache
->saved_regs
[DEPRECATED_FP_REGNUM
].addr
= 0;
4705 /* Account for general and floating-point register saves. */
4706 reg
= inst_saves_gr (inst
);
4707 if (reg
>= 3 && reg
<= 18
4708 && (!u
->Save_SP
|| reg
!= DEPRECATED_FP_REGNUM
))
4710 saved_gr_mask
&= ~(1 << reg
);
4711 if ((inst
>> 26) == 0x1b && extract_14 (inst
) >= 0)
4712 /* stwm with a positive displacement is a _post_
4714 cache
->saved_regs
[reg
].addr
= 0;
4715 else if ((inst
& 0xfc00000c) == 0x70000008)
4716 /* A std has explicit post_modify forms. */
4717 cache
->saved_regs
[reg
].addr
= 0;
4722 if ((inst
>> 26) == 0x1c)
4723 offset
= (inst
& 0x1 ? -1 << 13 : 0) | (((inst
>> 4) & 0x3ff) << 3);
4724 else if ((inst
>> 26) == 0x03)
4725 offset
= low_sign_extend (inst
& 0x1f, 5);
4727 offset
= extract_14 (inst
);
4729 /* Handle code with and without frame pointers. */
4731 cache
->saved_regs
[reg
].addr
= offset
;
4733 cache
->saved_regs
[reg
].addr
= (u
->Total_frame_size
<< 3) + offset
;
4737 /* GCC handles callee saved FP regs a little differently.
4739 It emits an instruction to put the value of the start of
4740 the FP store area into %r1. It then uses fstds,ma with a
4741 basereg of %r1 for the stores.
4743 HP CC emits them at the current stack pointer modifying the
4744 stack pointer as it stores each register. */
4746 /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */
4747 if ((inst
& 0xffffc000) == 0x34610000
4748 || (inst
& 0xffffc000) == 0x37c10000)
4749 fp_loc
= extract_14 (inst
);
4751 reg
= inst_saves_fr (inst
);
4752 if (reg
>= 12 && reg
<= 21)
4754 /* Note +4 braindamage below is necessary because the FP
4755 status registers are internally 8 registers rather than
4756 the expected 4 registers. */
4757 saved_fr_mask
&= ~(1 << reg
);
4760 /* 1st HP CC FP register store. After this
4761 instruction we've set enough state that the GCC and
4762 HPCC code are both handled in the same manner. */
4763 cache
->saved_regs
[reg
+ FP4_REGNUM
+ 4].addr
= 0;
4768 cache
->saved_regs
[reg
+ FP0_REGNUM
+ 4].addr
= fp_loc
;
4773 /* Quit if we hit any kind of branch the previous iteration. */
4774 if (final_iteration
)
4776 /* We want to look precisely one instruction beyond the branch
4777 if we have not found everything yet. */
4778 if (is_branch (inst
))
4779 final_iteration
= 1;
4784 /* The frame base always represents the value of %sp at entry to
4785 the current function (and is thus equivalent to the "saved"
4787 CORE_ADDR this_sp
= frame_unwind_register_unsigned (next_frame
, SP_REGNUM
);
4788 /* FIXME: cagney/2004-02-22: This assumes that the frame has been
4789 created. If it hasn't everything will be out-of-wack. */
4790 if (u
->Save_SP
&& trad_frame_addr_p (cache
->saved_regs
, SP_REGNUM
))
4791 /* Both we're expecting the SP to be saved and the SP has been
4792 saved. The entry SP value is saved at this frame's SP
4794 cache
->base
= read_memory_integer (this_sp
, TARGET_PTR_BIT
/ 8);
4796 /* The prologue has been slowly allocating stack space. Adjust
4798 cache
->base
= this_sp
- frame_size
;
4799 trad_frame_set_value (cache
->saved_regs
, SP_REGNUM
, cache
->base
);
4802 /* The PC is found in the "return register". */
4804 cache
->saved_regs
[PC_REGNUM
] = cache
->saved_regs
[31];
4806 cache
->saved_regs
[PC_REGNUM
] = cache
->saved_regs
[RP_REGNUM
];
4809 /* Convert all the offsets into addresses. */
4811 for (reg
= 0; reg
< NUM_REGS
; reg
++)
4813 if (trad_frame_addr_p (cache
->saved_regs
, reg
))
4814 cache
->saved_regs
[reg
].addr
+= cache
->base
;
4818 return (*this_cache
);
4822 hppa_frame_this_id (struct frame_info
*next_frame
, void **this_cache
,
4823 struct frame_id
*this_id
)
4825 struct hppa_frame_cache
*info
= hppa_frame_cache (next_frame
, this_cache
);
4826 (*this_id
) = frame_id_build (info
->base
, frame_func_unwind (next_frame
));
4830 hppa_frame_prev_register (struct frame_info
*next_frame
,
4832 int regnum
, int *optimizedp
,
4833 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
4834 int *realnump
, void *valuep
)
4836 struct hppa_frame_cache
*info
= hppa_frame_cache (next_frame
, this_cache
);
4837 trad_frame_prev_register (next_frame
, info
->saved_regs
, regnum
,
4838 optimizedp
, lvalp
, addrp
, realnump
, valuep
);
4841 static const struct frame_unwind hppa_frame_unwind
=
4845 hppa_frame_prev_register
4848 static const struct frame_unwind
*
4849 hppa_frame_unwind_sniffer (struct frame_info
*next_frame
)
4851 return &hppa_frame_unwind
;
4855 hppa_frame_base_address (struct frame_info
*next_frame
,
4858 struct hppa_frame_cache
*info
= hppa_frame_cache (next_frame
,
4863 static const struct frame_base hppa_frame_base
= {
4865 hppa_frame_base_address
,
4866 hppa_frame_base_address
,
4867 hppa_frame_base_address
4870 static const struct frame_base
*
4871 hppa_frame_base_sniffer (struct frame_info
*next_frame
)
4873 return &hppa_frame_base
;
4876 static struct frame_id
4877 hppa_unwind_dummy_id (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
4879 return frame_id_build (frame_unwind_register_unsigned (next_frame
,
4881 frame_pc_unwind (next_frame
));
4885 hppa_unwind_pc (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
4887 return frame_unwind_register_signed (next_frame
, PC_REGNUM
) & ~3;
4890 /* Exception handling support for the HP-UX ANSI C++ compiler.
4891 The compiler (aCC) provides a callback for exception events;
4892 GDB can set a breakpoint on this callback and find out what
4893 exception event has occurred. */
4895 /* The name of the hook to be set to point to the callback function */
4896 static char HP_ACC_EH_notify_hook
[] = "__eh_notify_hook";
4897 /* The name of the function to be used to set the hook value */
4898 static char HP_ACC_EH_set_hook_value
[] = "__eh_set_hook_value";
4899 /* The name of the callback function in end.o */
4900 static char HP_ACC_EH_notify_callback
[] = "__d_eh_notify_callback";
4901 /* Name of function in end.o on which a break is set (called by above) */
4902 static char HP_ACC_EH_break
[] = "__d_eh_break";
4903 /* Name of flag (in end.o) that enables catching throws */
4904 static char HP_ACC_EH_catch_throw
[] = "__d_eh_catch_throw";
4905 /* Name of flag (in end.o) that enables catching catching */
4906 static char HP_ACC_EH_catch_catch
[] = "__d_eh_catch_catch";
4907 /* The enum used by aCC */
4915 /* Is exception-handling support available with this executable? */
4916 static int hp_cxx_exception_support
= 0;
4917 /* Has the initialize function been run? */
4918 int hp_cxx_exception_support_initialized
= 0;
4919 /* Similar to above, but imported from breakpoint.c -- non-target-specific */
4920 extern int exception_support_initialized
;
4921 /* Address of __eh_notify_hook */
4922 static CORE_ADDR eh_notify_hook_addr
= 0;
4923 /* Address of __d_eh_notify_callback */
4924 static CORE_ADDR eh_notify_callback_addr
= 0;
4925 /* Address of __d_eh_break */
4926 static CORE_ADDR eh_break_addr
= 0;
4927 /* Address of __d_eh_catch_catch */
4928 static CORE_ADDR eh_catch_catch_addr
= 0;
4929 /* Address of __d_eh_catch_throw */
4930 static CORE_ADDR eh_catch_throw_addr
= 0;
4931 /* Sal for __d_eh_break */
4932 static struct symtab_and_line
*break_callback_sal
= 0;
4934 /* Code in end.c expects __d_pid to be set in the inferior,
4935 otherwise __d_eh_notify_callback doesn't bother to call
4936 __d_eh_break! So we poke the pid into this symbol
4941 setup_d_pid_in_inferior (void)
4944 struct minimal_symbol
*msymbol
;
4945 char buf
[4]; /* FIXME 32x64? */
4947 /* Slam the pid of the process into __d_pid; failing is only a warning! */
4948 msymbol
= lookup_minimal_symbol ("__d_pid", NULL
, symfile_objfile
);
4949 if (msymbol
== NULL
)
4951 warning ("Unable to find __d_pid symbol in object file.");
4952 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
4956 anaddr
= SYMBOL_VALUE_ADDRESS (msymbol
);
4957 store_unsigned_integer (buf
, 4, PIDGET (inferior_ptid
)); /* FIXME 32x64? */
4958 if (target_write_memory (anaddr
, buf
, 4)) /* FIXME 32x64? */
4960 warning ("Unable to write __d_pid");
4961 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
4967 /* Initialize exception catchpoint support by looking for the
4968 necessary hooks/callbacks in end.o, etc., and set the hook value to
4969 point to the required debug function
4975 initialize_hp_cxx_exception_support (void)
4977 struct symtabs_and_lines sals
;
4978 struct cleanup
*old_chain
;
4979 struct cleanup
*canonical_strings_chain
= NULL
;
4982 char *addr_end
= NULL
;
4983 char **canonical
= (char **) NULL
;
4985 struct symbol
*sym
= NULL
;
4986 struct minimal_symbol
*msym
= NULL
;
4987 struct objfile
*objfile
;
4988 asection
*shlib_info
;
4990 /* Detect and disallow recursion. On HP-UX with aCC, infinite
4991 recursion is a possibility because finding the hook for exception
4992 callbacks involves making a call in the inferior, which means
4993 re-inserting breakpoints which can re-invoke this code */
4995 static int recurse
= 0;
4998 hp_cxx_exception_support_initialized
= 0;
4999 exception_support_initialized
= 0;
5003 hp_cxx_exception_support
= 0;
5005 /* First check if we have seen any HP compiled objects; if not,
5006 it is very unlikely that HP's idiosyncratic callback mechanism
5007 for exception handling debug support will be available!
5008 This will percolate back up to breakpoint.c, where our callers
5009 will decide to try the g++ exception-handling support instead. */
5010 if (!hp_som_som_object_present
)
5013 /* We have a SOM executable with SOM debug info; find the hooks */
5015 /* First look for the notify hook provided by aCC runtime libs */
5016 /* If we find this symbol, we conclude that the executable must
5017 have HP aCC exception support built in. If this symbol is not
5018 found, even though we're a HP SOM-SOM file, we may have been
5019 built with some other compiler (not aCC). This results percolates
5020 back up to our callers in breakpoint.c which can decide to
5021 try the g++ style of exception support instead.
5022 If this symbol is found but the other symbols we require are
5023 not found, there is something weird going on, and g++ support
5024 should *not* be tried as an alternative.
5026 ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined.
5027 ASSUMPTION: HP aCC and g++ modules cannot be linked together. */
5029 /* libCsup has this hook; it'll usually be non-debuggable */
5030 msym
= lookup_minimal_symbol (HP_ACC_EH_notify_hook
, NULL
, NULL
);
5033 eh_notify_hook_addr
= SYMBOL_VALUE_ADDRESS (msym
);
5034 hp_cxx_exception_support
= 1;
5038 warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook
);
5039 warning ("Executable may not have been compiled debuggable with HP aCC.");
5040 warning ("GDB will be unable to intercept exception events.");
5041 eh_notify_hook_addr
= 0;
5042 hp_cxx_exception_support
= 0;
5046 /* Next look for the notify callback routine in end.o */
5047 /* This is always available in the SOM symbol dictionary if end.o is linked in */
5048 msym
= lookup_minimal_symbol (HP_ACC_EH_notify_callback
, NULL
, NULL
);
5051 eh_notify_callback_addr
= SYMBOL_VALUE_ADDRESS (msym
);
5052 hp_cxx_exception_support
= 1;
5056 warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback
);
5057 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
5058 warning ("GDB will be unable to intercept exception events.");
5059 eh_notify_callback_addr
= 0;
5063 #ifndef GDB_TARGET_IS_HPPA_20W
5064 /* Check whether the executable is dynamically linked or archive bound */
5065 /* With an archive-bound executable we can use the raw addresses we find
5066 for the callback function, etc. without modification. For an executable
5067 with shared libraries, we have to do more work to find the plabel, which
5068 can be the target of a call through $$dyncall from the aCC runtime support
5069 library (libCsup) which is linked shared by default by aCC. */
5070 /* This test below was copied from somsolib.c/somread.c. It may not be a very
5071 reliable one to test that an executable is linked shared. pai/1997-07-18 */
5072 shlib_info
= bfd_get_section_by_name (symfile_objfile
->obfd
, "$SHLIB_INFO$");
5073 if (shlib_info
&& (bfd_section_size (symfile_objfile
->obfd
, shlib_info
) != 0))
5075 /* The minsym we have has the local code address, but that's not the
5076 plabel that can be used by an inter-load-module call. */
5077 /* Find solib handle for main image (which has end.o), and use that
5078 and the min sym as arguments to __d_shl_get() (which does the equivalent
5079 of shl_findsym()) to find the plabel. */
5081 args_for_find_stub args
;
5082 static char message
[] = "Error while finding exception callback hook:\n";
5084 args
.solib_handle
= som_solib_get_solib_by_pc (eh_notify_callback_addr
);
5086 args
.return_val
= 0;
5089 catch_errors (cover_find_stub_with_shl_get
, &args
, message
,
5091 eh_notify_callback_addr
= args
.return_val
;
5094 exception_catchpoints_are_fragile
= 1;
5096 if (!eh_notify_callback_addr
)
5098 /* We can get here either if there is no plabel in the export list
5099 for the main image, or if something strange happened (?) */
5100 warning ("Couldn't find a plabel (indirect function label) for the exception callback.");
5101 warning ("GDB will not be able to intercept exception events.");
5106 exception_catchpoints_are_fragile
= 0;
5109 /* Now, look for the breakpointable routine in end.o */
5110 /* This should also be available in the SOM symbol dict. if end.o linked in */
5111 msym
= lookup_minimal_symbol (HP_ACC_EH_break
, NULL
, NULL
);
5114 eh_break_addr
= SYMBOL_VALUE_ADDRESS (msym
);
5115 hp_cxx_exception_support
= 1;
5119 warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break
);
5120 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
5121 warning ("GDB will be unable to intercept exception events.");
5126 /* Next look for the catch enable flag provided in end.o */
5127 sym
= lookup_symbol (HP_ACC_EH_catch_catch
, (struct block
*) NULL
,
5128 VAR_DOMAIN
, 0, (struct symtab
**) NULL
);
5129 if (sym
) /* sometimes present in debug info */
5131 eh_catch_catch_addr
= SYMBOL_VALUE_ADDRESS (sym
);
5132 hp_cxx_exception_support
= 1;
5135 /* otherwise look in SOM symbol dict. */
5137 msym
= lookup_minimal_symbol (HP_ACC_EH_catch_catch
, NULL
, NULL
);
5140 eh_catch_catch_addr
= SYMBOL_VALUE_ADDRESS (msym
);
5141 hp_cxx_exception_support
= 1;
5145 warning ("Unable to enable interception of exception catches.");
5146 warning ("Executable may not have been compiled debuggable with HP aCC.");
5147 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
5152 /* Next look for the catch enable flag provided end.o */
5153 sym
= lookup_symbol (HP_ACC_EH_catch_catch
, (struct block
*) NULL
,
5154 VAR_DOMAIN
, 0, (struct symtab
**) NULL
);
5155 if (sym
) /* sometimes present in debug info */
5157 eh_catch_throw_addr
= SYMBOL_VALUE_ADDRESS (sym
);
5158 hp_cxx_exception_support
= 1;
5161 /* otherwise look in SOM symbol dict. */
5163 msym
= lookup_minimal_symbol (HP_ACC_EH_catch_throw
, NULL
, NULL
);
5166 eh_catch_throw_addr
= SYMBOL_VALUE_ADDRESS (msym
);
5167 hp_cxx_exception_support
= 1;
5171 warning ("Unable to enable interception of exception throws.");
5172 warning ("Executable may not have been compiled debuggable with HP aCC.");
5173 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
5179 hp_cxx_exception_support
= 2; /* everything worked so far */
5180 hp_cxx_exception_support_initialized
= 1;
5181 exception_support_initialized
= 1;
5186 /* Target operation for enabling or disabling interception of
5188 KIND is either EX_EVENT_THROW or EX_EVENT_CATCH
5189 ENABLE is either 0 (disable) or 1 (enable).
5190 Return value is NULL if no support found;
5191 -1 if something went wrong,
5192 or a pointer to a symtab/line struct if the breakpointable
5193 address was found. */
5195 struct symtab_and_line
*
5196 child_enable_exception_callback (enum exception_event_kind kind
, int enable
)
5200 if (!exception_support_initialized
|| !hp_cxx_exception_support_initialized
)
5201 if (!initialize_hp_cxx_exception_support ())
5204 switch (hp_cxx_exception_support
)
5207 /* Assuming no HP support at all */
5210 /* HP support should be present, but something went wrong */
5211 return (struct symtab_and_line
*) -1; /* yuck! */
5212 /* there may be other cases in the future */
5215 /* Set the EH hook to point to the callback routine */
5216 store_unsigned_integer (buf
, 4, enable
? eh_notify_callback_addr
: 0); /* FIXME 32x64 problem */
5217 /* pai: (temp) FIXME should there be a pack operation first? */
5218 if (target_write_memory (eh_notify_hook_addr
, buf
, 4)) /* FIXME 32x64 problem */
5220 warning ("Could not write to target memory for exception event callback.");
5221 warning ("Interception of exception events may not work.");
5222 return (struct symtab_and_line
*) -1;
5226 /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */
5227 if (PIDGET (inferior_ptid
) > 0)
5229 if (setup_d_pid_in_inferior ())
5230 return (struct symtab_and_line
*) -1;
5234 warning ("Internal error: Invalid inferior pid? Cannot intercept exception events.");
5235 return (struct symtab_and_line
*) -1;
5241 case EX_EVENT_THROW
:
5242 store_unsigned_integer (buf
, 4, enable
? 1 : 0);
5243 if (target_write_memory (eh_catch_throw_addr
, buf
, 4)) /* FIXME 32x64? */
5245 warning ("Couldn't enable exception throw interception.");
5246 return (struct symtab_and_line
*) -1;
5249 case EX_EVENT_CATCH
:
5250 store_unsigned_integer (buf
, 4, enable
? 1 : 0);
5251 if (target_write_memory (eh_catch_catch_addr
, buf
, 4)) /* FIXME 32x64? */
5253 warning ("Couldn't enable exception catch interception.");
5254 return (struct symtab_and_line
*) -1;
5258 error ("Request to enable unknown or unsupported exception event.");
5261 /* Copy break address into new sal struct, malloc'ing if needed. */
5262 if (!break_callback_sal
)
5264 break_callback_sal
= (struct symtab_and_line
*) xmalloc (sizeof (struct symtab_and_line
));
5266 init_sal (break_callback_sal
);
5267 break_callback_sal
->symtab
= NULL
;
5268 break_callback_sal
->pc
= eh_break_addr
;
5269 break_callback_sal
->line
= 0;
5270 break_callback_sal
->end
= eh_break_addr
;
5272 return break_callback_sal
;
5275 /* Record some information about the current exception event */
5276 static struct exception_event_record current_ex_event
;
5277 /* Convenience struct */
5278 static struct symtab_and_line null_symtab_and_line
=
5281 /* Report current exception event. Returns a pointer to a record
5282 that describes the kind of the event, where it was thrown from,
5283 and where it will be caught. More information may be reported
5285 struct exception_event_record
*
5286 child_get_current_exception_event (void)
5288 CORE_ADDR event_kind
;
5289 CORE_ADDR throw_addr
;
5290 CORE_ADDR catch_addr
;
5291 struct frame_info
*fi
, *curr_frame
;
5294 curr_frame
= get_current_frame ();
5296 return (struct exception_event_record
*) NULL
;
5298 /* Go up one frame to __d_eh_notify_callback, because at the
5299 point when this code is executed, there's garbage in the
5300 arguments of __d_eh_break. */
5301 fi
= find_relative_frame (curr_frame
, &level
);
5303 return (struct exception_event_record
*) NULL
;
5307 /* Read in the arguments */
5308 /* __d_eh_notify_callback() is called with 3 arguments:
5309 1. event kind catch or throw
5310 2. the target address if known
5311 3. a flag -- not sure what this is. pai/1997-07-17 */
5312 event_kind
= read_register (ARG0_REGNUM
);
5313 catch_addr
= read_register (ARG1_REGNUM
);
5315 /* Now go down to a user frame */
5316 /* For a throw, __d_eh_break is called by
5317 __d_eh_notify_callback which is called by
5318 __notify_throw which is called
5320 For a catch, __d_eh_break is called by
5321 __d_eh_notify_callback which is called by
5322 <stackwalking stuff> which is called by
5323 __throw__<stuff> or __rethrow_<stuff> which is called
5325 /* FIXME: Don't use such magic numbers; search for the frames */
5326 level
= (event_kind
== EX_EVENT_THROW
) ? 3 : 4;
5327 fi
= find_relative_frame (curr_frame
, &level
);
5329 return (struct exception_event_record
*) NULL
;
5332 throw_addr
= get_frame_pc (fi
);
5334 /* Go back to original (top) frame */
5335 select_frame (curr_frame
);
5337 current_ex_event
.kind
= (enum exception_event_kind
) event_kind
;
5338 current_ex_event
.throw_sal
= find_pc_line (throw_addr
, 1);
5339 current_ex_event
.catch_sal
= find_pc_line (catch_addr
, 1);
5341 return ¤t_ex_event
;
5344 /* Instead of this nasty cast, add a method pvoid() that prints out a
5345 host VOID data type (remember %p isn't portable). */
5348 hppa_pointer_to_address_hack (void *ptr
)
5350 gdb_assert (sizeof (ptr
) == TYPE_LENGTH (builtin_type_void_data_ptr
));
5351 return POINTER_TO_ADDRESS (builtin_type_void_data_ptr
, &ptr
);
5355 unwind_command (char *exp
, int from_tty
)
5358 struct unwind_table_entry
*u
;
5360 /* If we have an expression, evaluate it and use it as the address. */
5362 if (exp
!= 0 && *exp
!= 0)
5363 address
= parse_and_eval_address (exp
);
5367 u
= find_unwind_entry (address
);
5371 printf_unfiltered ("Can't find unwind table entry for %s\n", exp
);
5375 printf_unfiltered ("unwind_table_entry (0x%s):\n",
5376 paddr_nz (hppa_pointer_to_address_hack (u
)));
5378 printf_unfiltered ("\tregion_start = ");
5379 print_address (u
->region_start
, gdb_stdout
);
5381 printf_unfiltered ("\n\tregion_end = ");
5382 print_address (u
->region_end
, gdb_stdout
);
5384 #define pif(FLD) if (u->FLD) printf_unfiltered (" "#FLD);
5386 printf_unfiltered ("\n\tflags =");
5387 pif (Cannot_unwind
);
5389 pif (Millicode_save_sr0
);
5392 pif (Variable_Frame
);
5393 pif (Separate_Package_Body
);
5394 pif (Frame_Extension_Millicode
);
5395 pif (Stack_Overflow_Check
);
5396 pif (Two_Instruction_SP_Increment
);
5400 pif (Save_MRP_in_frame
);
5401 pif (extn_ptr_defined
);
5402 pif (Cleanup_defined
);
5403 pif (MPE_XL_interrupt_marker
);
5404 pif (HP_UX_interrupt_marker
);
5407 putchar_unfiltered ('\n');
5409 #define pin(FLD) printf_unfiltered ("\t"#FLD" = 0x%x\n", u->FLD);
5411 pin (Region_description
);
5414 pin (Total_frame_size
);
5418 hppa_skip_permanent_breakpoint (void)
5420 /* To step over a breakpoint instruction on the PA takes some
5421 fiddling with the instruction address queue.
5423 When we stop at a breakpoint, the IA queue front (the instruction
5424 we're executing now) points at the breakpoint instruction, and
5425 the IA queue back (the next instruction to execute) points to
5426 whatever instruction we would execute after the breakpoint, if it
5427 were an ordinary instruction. This is the case even if the
5428 breakpoint is in the delay slot of a branch instruction.
5430 Clearly, to step past the breakpoint, we need to set the queue
5431 front to the back. But what do we put in the back? What
5432 instruction comes after that one? Because of the branch delay
5433 slot, the next insn is always at the back + 4. */
5434 write_register (PCOQ_HEAD_REGNUM
, read_register (PCOQ_TAIL_REGNUM
));
5435 write_register (PCSQ_HEAD_REGNUM
, read_register (PCSQ_TAIL_REGNUM
));
5437 write_register (PCOQ_TAIL_REGNUM
, read_register (PCOQ_TAIL_REGNUM
) + 4);
5438 /* We can leave the tail's space the same, since there's no jump. */
5441 /* Copy the function value from VALBUF into the proper location
5442 for a function return.
5444 Called only in the context of the "return" command. */
5447 hppa32_store_return_value (struct type
*type
, char *valbuf
)
5449 /* For software floating point, the return value goes into the
5450 integer registers. But we do not have any flag to key this on,
5451 so we always store the value into the integer registers.
5453 If its a float value, then we also store it into the floating
5455 deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (28)
5456 + (TYPE_LENGTH (type
) > 4
5457 ? (8 - TYPE_LENGTH (type
))
5458 : (4 - TYPE_LENGTH (type
))),
5459 valbuf
, TYPE_LENGTH (type
));
5460 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
5461 deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (FP4_REGNUM
),
5462 valbuf
, TYPE_LENGTH (type
));
5465 /* Same as hppa32_store_return_value(), but for the PA64 ABI. */
5468 hppa64_store_return_value (struct type
*type
, char *valbuf
)
5470 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
5471 deprecated_write_register_bytes
5472 (DEPRECATED_REGISTER_BYTE (FP4_REGNUM
)
5473 + DEPRECATED_REGISTER_SIZE
- TYPE_LENGTH (type
),
5474 valbuf
, TYPE_LENGTH (type
));
5475 else if (is_integral_type(type
))
5476 deprecated_write_register_bytes
5477 (DEPRECATED_REGISTER_BYTE (28)
5478 + DEPRECATED_REGISTER_SIZE
- TYPE_LENGTH (type
),
5479 valbuf
, TYPE_LENGTH (type
));
5480 else if (TYPE_LENGTH (type
) <= 8)
5481 deprecated_write_register_bytes
5482 (DEPRECATED_REGISTER_BYTE (28),valbuf
, TYPE_LENGTH (type
));
5483 else if (TYPE_LENGTH (type
) <= 16)
5485 deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (28),valbuf
, 8);
5486 deprecated_write_register_bytes
5487 (DEPRECATED_REGISTER_BYTE (29), valbuf
+ 8, TYPE_LENGTH (type
) - 8);
5491 /* Copy the function's return value into VALBUF.
5493 This function is called only in the context of "target function calls",
5494 ie. when the debugger forces a function to be called in the child, and
5495 when the debugger forces a fucntion to return prematurely via the
5496 "return" command. */
5499 hppa32_extract_return_value (struct type
*type
, char *regbuf
, char *valbuf
)
5501 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
5502 memcpy (valbuf
, regbuf
+ DEPRECATED_REGISTER_BYTE (FP4_REGNUM
), TYPE_LENGTH (type
));
5506 + DEPRECATED_REGISTER_BYTE (28)
5507 + (TYPE_LENGTH (type
) > 4
5508 ? (8 - TYPE_LENGTH (type
))
5509 : (4 - TYPE_LENGTH (type
)))),
5510 TYPE_LENGTH (type
));
5513 /* Same as hppa32_extract_return_value but for the PA64 ABI case. */
5516 hppa64_extract_return_value (struct type
*type
, char *regbuf
, char *valbuf
)
5518 /* RM: Floats are returned in FR4R, doubles in FR4.
5519 Integral values are in r28, padded on the left.
5520 Aggregates less that 65 bits are in r28, right padded.
5521 Aggregates upto 128 bits are in r28 and r29, right padded. */
5522 if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
5524 regbuf
+ DEPRECATED_REGISTER_BYTE (FP4_REGNUM
)
5525 + DEPRECATED_REGISTER_SIZE
- TYPE_LENGTH (type
),
5526 TYPE_LENGTH (type
));
5527 else if (is_integral_type(type
))
5529 regbuf
+ DEPRECATED_REGISTER_BYTE (28)
5530 + DEPRECATED_REGISTER_SIZE
- TYPE_LENGTH (type
),
5531 TYPE_LENGTH (type
));
5532 else if (TYPE_LENGTH (type
) <= 8)
5533 memcpy (valbuf
, regbuf
+ DEPRECATED_REGISTER_BYTE (28),
5534 TYPE_LENGTH (type
));
5535 else if (TYPE_LENGTH (type
) <= 16)
5537 memcpy (valbuf
, regbuf
+ DEPRECATED_REGISTER_BYTE (28), 8);
5538 memcpy (valbuf
+ 8, regbuf
+ DEPRECATED_REGISTER_BYTE (29),
5539 TYPE_LENGTH (type
) - 8);
5544 hppa_reg_struct_has_addr (int gcc_p
, struct type
*type
)
5546 /* On the PA, any pass-by-value structure > 8 bytes is actually passed
5547 via a pointer regardless of its type or the compiler used. */
5548 return (TYPE_LENGTH (type
) > 8);
5552 hppa_inner_than (CORE_ADDR lhs
, CORE_ADDR rhs
)
5554 /* Stack grows upward */
5559 hppa32_stack_align (CORE_ADDR sp
)
5561 /* elz: adjust the quantity to the next highest value which is
5562 64-bit aligned. This is used in valops.c, when the sp is adjusted.
5563 On hppa the sp must always be kept 64-bit aligned */
5564 return ((sp
% 8) ? (sp
+ 7) & -8 : sp
);
5568 hppa64_stack_align (CORE_ADDR sp
)
5570 /* The PA64 ABI mandates a 16 byte stack alignment. */
5571 return ((sp
% 16) ? (sp
+ 15) & -16 : sp
);
5575 hppa_pc_requires_run_before_use (CORE_ADDR pc
)
5577 /* Sometimes we may pluck out a minimal symbol that has a negative address.
5579 An example of this occurs when an a.out is linked against a foo.sl.
5580 The foo.sl defines a global bar(), and the a.out declares a signature
5581 for bar(). However, the a.out doesn't directly call bar(), but passes
5582 its address in another call.
5584 If you have this scenario and attempt to "break bar" before running,
5585 gdb will find a minimal symbol for bar() in the a.out. But that
5586 symbol's address will be negative. What this appears to denote is
5587 an index backwards from the base of the procedure linkage table (PLT)
5588 into the data linkage table (DLT), the end of which is contiguous
5589 with the start of the PLT. This is clearly not a valid address for
5590 us to set a breakpoint on.
5592 Note that one must be careful in how one checks for a negative address.
5593 0xc0000000 is a legitimate address of something in a shared text
5594 segment, for example. Since I don't know what the possible range
5595 is of these "really, truly negative" addresses that come from the
5596 minimal symbols, I'm resorting to the gross hack of checking the
5597 top byte of the address for all 1's. Sigh. */
5599 return (!target_has_stack
&& (pc
& 0xFF000000));
5603 hppa_instruction_nullified (void)
5605 /* brobecker 2002/11/07: Couldn't we use a ULONGEST here? It would
5606 avoid the type cast. I'm leaving it as is for now as I'm doing
5607 semi-mechanical multiarching-related changes. */
5608 const int ipsw
= (int) read_register (IPSW_REGNUM
);
5609 const int flags
= (int) read_register (FLAGS_REGNUM
);
5611 return ((ipsw
& 0x00200000) && !(flags
& 0x2));
5615 hppa_register_raw_size (int reg_nr
)
5617 /* All registers have the same size. */
5618 return DEPRECATED_REGISTER_SIZE
;
5621 /* Index within the register vector of the first byte of the space i
5622 used for register REG_NR. */
5625 hppa_register_byte (int reg_nr
)
5627 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
5629 return reg_nr
* tdep
->bytes_per_address
;
5632 /* Return the GDB type object for the "standard" data type of data
5636 hppa32_register_virtual_type (int reg_nr
)
5638 if (reg_nr
< FP4_REGNUM
)
5639 return builtin_type_int
;
5641 return builtin_type_float
;
5644 /* Return the GDB type object for the "standard" data type of data
5645 in register N. hppa64 version. */
5648 hppa64_register_virtual_type (int reg_nr
)
5650 if (reg_nr
< FP4_REGNUM
)
5651 return builtin_type_unsigned_long_long
;
5653 return builtin_type_double
;
5656 /* Store the address of the place in which to copy the structure the
5657 subroutine will return. This is called from call_function. */
5660 hppa_store_struct_return (CORE_ADDR addr
, CORE_ADDR sp
)
5662 write_register (28, addr
);
5664 /* Return True if REGNUM is not a register available to the user
5665 through ptrace(). */
5668 hppa_cannot_store_register (int regnum
)
5671 || regnum
== PCSQ_HEAD_REGNUM
5672 || (regnum
>= PCSQ_TAIL_REGNUM
&& regnum
< IPSW_REGNUM
)
5673 || (regnum
> IPSW_REGNUM
&& regnum
< FP4_REGNUM
));
5678 hppa_smash_text_address (CORE_ADDR addr
)
5680 /* The low two bits of the PC on the PA contain the privilege level.
5681 Some genius implementing a (non-GCC) compiler apparently decided
5682 this means that "addresses" in a text section therefore include a
5683 privilege level, and thus symbol tables should contain these bits.
5684 This seems like a bonehead thing to do--anyway, it seems to work
5685 for our purposes to just ignore those bits. */
5687 return (addr
&= ~0x3);
5690 /* Get the ith function argument for the current function. */
5692 hppa_fetch_pointer_argument (struct frame_info
*frame
, int argi
,
5696 get_frame_register (frame
, R0_REGNUM
+ 26 - argi
, &addr
);
5700 /* Here is a table of C type sizes on hppa with various compiles
5701 and options. I measured this on PA 9000/800 with HP-UX 11.11
5702 and these compilers:
5704 /usr/ccs/bin/cc HP92453-01 A.11.01.21
5705 /opt/ansic/bin/cc HP92453-01 B.11.11.28706.GP
5706 /opt/aCC/bin/aCC B3910B A.03.45
5707 gcc gcc 3.3.2 native hppa2.0w-hp-hpux11.11
5709 cc : 1 2 4 4 8 : 4 8 -- : 4 4
5710 ansic +DA1.1 : 1 2 4 4 8 : 4 8 16 : 4 4
5711 ansic +DA2.0 : 1 2 4 4 8 : 4 8 16 : 4 4
5712 ansic +DA2.0W : 1 2 4 8 8 : 4 8 16 : 8 8
5713 acc +DA1.1 : 1 2 4 4 8 : 4 8 16 : 4 4
5714 acc +DA2.0 : 1 2 4 4 8 : 4 8 16 : 4 4
5715 acc +DA2.0W : 1 2 4 8 8 : 4 8 16 : 8 8
5716 gcc : 1 2 4 4 8 : 4 8 16 : 4 4
5720 compiler and options
5721 char, short, int, long, long long
5722 float, double, long double
5725 So all these compilers use either ILP32 or LP64 model.
5726 TODO: gcc has more options so it needs more investigation.
5728 For floating point types, see:
5730 http://docs.hp.com/hpux/pdf/B3906-90006.pdf
5731 HP-UX floating-point guide, hpux 11.00
5733 -- chastain 2003-12-18 */
5735 static struct gdbarch
*
5736 hppa_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
5738 struct gdbarch_tdep
*tdep
;
5739 struct gdbarch
*gdbarch
;
5741 /* Try to determine the ABI of the object we are loading. */
5742 if (info
.abfd
!= NULL
&& info
.osabi
== GDB_OSABI_UNKNOWN
)
5744 /* If it's a SOM file, assume it's HP/UX SOM. */
5745 if (bfd_get_flavour (info
.abfd
) == bfd_target_som_flavour
)
5746 info
.osabi
= GDB_OSABI_HPUX_SOM
;
5749 /* find a candidate among the list of pre-declared architectures. */
5750 arches
= gdbarch_list_lookup_by_info (arches
, &info
);
5752 return (arches
->gdbarch
);
5754 /* If none found, then allocate and initialize one. */
5755 tdep
= XMALLOC (struct gdbarch_tdep
);
5756 gdbarch
= gdbarch_alloc (&info
, tdep
);
5758 /* Determine from the bfd_arch_info structure if we are dealing with
5759 a 32 or 64 bits architecture. If the bfd_arch_info is not available,
5760 then default to a 32bit machine. */
5761 if (info
.bfd_arch_info
!= NULL
)
5762 tdep
->bytes_per_address
=
5763 info
.bfd_arch_info
->bits_per_address
/ info
.bfd_arch_info
->bits_per_byte
;
5765 tdep
->bytes_per_address
= 4;
5767 /* Some parts of the gdbarch vector depend on whether we are running
5768 on a 32 bits or 64 bits target. */
5769 switch (tdep
->bytes_per_address
)
5772 set_gdbarch_num_regs (gdbarch
, hppa32_num_regs
);
5773 set_gdbarch_register_name (gdbarch
, hppa32_register_name
);
5774 set_gdbarch_deprecated_register_virtual_type
5775 (gdbarch
, hppa32_register_virtual_type
);
5778 set_gdbarch_num_regs (gdbarch
, hppa64_num_regs
);
5779 set_gdbarch_register_name (gdbarch
, hppa64_register_name
);
5780 set_gdbarch_deprecated_register_virtual_type
5781 (gdbarch
, hppa64_register_virtual_type
);
5784 internal_error (__FILE__
, __LINE__
, "Unsupported address size: %d",
5785 tdep
->bytes_per_address
);
5788 /* The following gdbarch vector elements depend on other parts of this
5789 vector which have been set above, depending on the ABI. */
5790 set_gdbarch_deprecated_register_bytes
5791 (gdbarch
, gdbarch_num_regs (gdbarch
) * tdep
->bytes_per_address
);
5792 set_gdbarch_long_bit (gdbarch
, tdep
->bytes_per_address
* TARGET_CHAR_BIT
);
5793 set_gdbarch_ptr_bit (gdbarch
, tdep
->bytes_per_address
* TARGET_CHAR_BIT
);
5795 /* The following gdbarch vector elements are the same in both ILP32
5796 and LP64, but might show differences some day. */
5797 set_gdbarch_long_long_bit (gdbarch
, 64);
5798 set_gdbarch_long_double_bit (gdbarch
, 128);
5799 set_gdbarch_long_double_format (gdbarch
, &floatformat_ia64_quad_big
);
5801 /* The following gdbarch vector elements do not depend on the address
5802 size, or in any other gdbarch element previously set. */
5803 set_gdbarch_skip_prologue (gdbarch
, hppa_skip_prologue
);
5804 set_gdbarch_skip_trampoline_code (gdbarch
, hppa_skip_trampoline_code
);
5805 set_gdbarch_in_solib_call_trampoline (gdbarch
, hppa_in_solib_call_trampoline
);
5806 set_gdbarch_in_solib_return_trampoline (gdbarch
,
5807 hppa_in_solib_return_trampoline
);
5808 set_gdbarch_inner_than (gdbarch
, hppa_inner_than
);
5809 set_gdbarch_deprecated_register_size (gdbarch
, tdep
->bytes_per_address
);
5810 set_gdbarch_deprecated_fp_regnum (gdbarch
, 3);
5811 set_gdbarch_sp_regnum (gdbarch
, 30);
5812 set_gdbarch_fp0_regnum (gdbarch
, 64);
5813 set_gdbarch_pc_regnum (gdbarch
, PCOQ_HEAD_REGNUM
);
5814 set_gdbarch_deprecated_register_raw_size (gdbarch
, hppa_register_raw_size
);
5815 set_gdbarch_deprecated_register_byte (gdbarch
, hppa_register_byte
);
5816 set_gdbarch_deprecated_register_virtual_size (gdbarch
, hppa_register_raw_size
);
5817 set_gdbarch_deprecated_max_register_raw_size (gdbarch
, tdep
->bytes_per_address
);
5818 set_gdbarch_deprecated_max_register_virtual_size (gdbarch
, 8);
5819 set_gdbarch_cannot_store_register (gdbarch
, hppa_cannot_store_register
);
5820 set_gdbarch_addr_bits_remove (gdbarch
, hppa_smash_text_address
);
5821 set_gdbarch_smash_text_address (gdbarch
, hppa_smash_text_address
);
5822 set_gdbarch_believe_pcc_promotion (gdbarch
, 1);
5823 set_gdbarch_read_pc (gdbarch
, hppa_target_read_pc
);
5824 set_gdbarch_write_pc (gdbarch
, hppa_target_write_pc
);
5825 set_gdbarch_deprecated_target_read_fp (gdbarch
, hppa_target_read_fp
);
5827 /* Helper for function argument information. */
5828 set_gdbarch_fetch_pointer_argument (gdbarch
, hppa_fetch_pointer_argument
);
5830 set_gdbarch_print_insn (gdbarch
, print_insn_hppa
);
5832 /* When a hardware watchpoint triggers, we'll move the inferior past
5833 it by removing all eventpoints; stepping past the instruction
5834 that caused the trigger; reinserting eventpoints; and checking
5835 whether any watched location changed. */
5836 set_gdbarch_have_nonsteppable_watchpoint (gdbarch
, 1);
5838 /* Inferior function call methods. */
5841 set_gdbarch_frame_align (gdbarch
, hppa_frame_align
);
5842 switch (tdep
->bytes_per_address
)
5845 set_gdbarch_push_dummy_call (gdbarch
, hppa32_push_dummy_call
);
5848 set_gdbarch_push_dummy_call (gdbarch
, hppa64_push_dummy_call
);
5854 switch (tdep
->bytes_per_address
)
5857 set_gdbarch_deprecated_call_dummy_length (gdbarch
, hppa32_call_dummy_length
);
5858 set_gdbarch_deprecated_stack_align (gdbarch
, hppa32_stack_align
);
5859 set_gdbarch_deprecated_reg_struct_has_addr (gdbarch
, hppa_reg_struct_has_addr
);
5862 set_gdbarch_deprecated_call_dummy_breakpoint_offset (gdbarch
, hppa64_call_dummy_breakpoint_offset
);
5863 set_gdbarch_deprecated_call_dummy_length (gdbarch
, hppa64_call_dummy_length
);
5864 set_gdbarch_deprecated_stack_align (gdbarch
, hppa64_stack_align
);
5867 set_gdbarch_deprecated_push_dummy_frame (gdbarch
, hppa_push_dummy_frame
);
5868 /* set_gdbarch_deprecated_fix_call_dummy (gdbarch, hppa_fix_call_dummy); */
5869 set_gdbarch_deprecated_push_arguments (gdbarch
, hppa_push_arguments
);
5870 set_gdbarch_deprecated_use_generic_dummy_frames (gdbarch
, 0);
5871 set_gdbarch_deprecated_pc_in_call_dummy (gdbarch
, deprecated_pc_in_call_dummy_on_stack
);
5872 set_gdbarch_call_dummy_location (gdbarch
, ON_STACK
);
5875 /* Struct return methods. */
5878 switch (tdep
->bytes_per_address
)
5881 set_gdbarch_return_value (gdbarch
, hppa32_return_value
);
5884 set_gdbarch_return_value (gdbarch
, hppa64_return_value
);
5887 internal_error (__FILE__
, __LINE__
, "bad switch");
5892 switch (tdep
->bytes_per_address
)
5895 set_gdbarch_deprecated_extract_return_value (gdbarch
, hppa32_extract_return_value
);
5896 set_gdbarch_use_struct_convention (gdbarch
, hppa32_use_struct_convention
);
5897 set_gdbarch_deprecated_store_return_value (gdbarch
, hppa32_store_return_value
);
5900 set_gdbarch_deprecated_extract_return_value (gdbarch
, hppa64_extract_return_value
);
5901 set_gdbarch_use_struct_convention (gdbarch
, hppa64_use_struct_convention
);
5902 set_gdbarch_deprecated_store_return_value (gdbarch
, hppa64_store_return_value
);
5905 set_gdbarch_deprecated_store_struct_return (gdbarch
, hppa_store_struct_return
);
5908 /* Frame unwind methods. */
5911 set_gdbarch_unwind_dummy_id (gdbarch
, hppa_unwind_dummy_id
);
5912 set_gdbarch_unwind_pc (gdbarch
, hppa_unwind_pc
);
5913 frame_unwind_append_sniffer (gdbarch
, hppa_frame_unwind_sniffer
);
5914 frame_base_append_sniffer (gdbarch
, hppa_frame_base_sniffer
);
5918 set_gdbarch_deprecated_saved_pc_after_call (gdbarch
, hppa_saved_pc_after_call
);
5919 set_gdbarch_deprecated_init_frame_pc (gdbarch
, deprecated_init_frame_pc_default
);
5920 set_gdbarch_deprecated_frame_init_saved_regs (gdbarch
, hppa_frame_init_saved_regs
);
5921 set_gdbarch_deprecated_init_extra_frame_info (gdbarch
, hppa_init_extra_frame_info
);
5922 set_gdbarch_deprecated_frame_chain (gdbarch
, hppa_frame_chain
);
5923 set_gdbarch_deprecated_frame_chain_valid (gdbarch
, hppa_frame_chain_valid
);
5924 set_gdbarch_deprecated_frameless_function_invocation (gdbarch
, hppa_frameless_function_invocation
);
5925 set_gdbarch_deprecated_frame_saved_pc (gdbarch
, hppa_frame_saved_pc
);
5926 set_gdbarch_deprecated_pop_frame (gdbarch
, hppa_pop_frame
);
5929 /* Hook in ABI-specific overrides, if they have been registered. */
5930 gdbarch_init_osabi (info
, gdbarch
);
5936 hppa_dump_tdep (struct gdbarch
*current_gdbarch
, struct ui_file
*file
)
5938 /* Nothing to print for the moment. */
5942 _initialize_hppa_tdep (void)
5944 struct cmd_list_element
*c
;
5945 void break_at_finish_command (char *arg
, int from_tty
);
5946 void tbreak_at_finish_command (char *arg
, int from_tty
);
5947 void break_at_finish_at_depth_command (char *arg
, int from_tty
);
5949 gdbarch_register (bfd_arch_hppa
, hppa_gdbarch_init
, hppa_dump_tdep
);
5951 add_cmd ("unwind", class_maintenance
, unwind_command
,
5952 "Print unwind table entry at given address.",
5953 &maintenanceprintlist
);
5955 deprecate_cmd (add_com ("xbreak", class_breakpoint
,
5956 break_at_finish_command
,
5957 concat ("Set breakpoint at procedure exit. \n\
5958 Argument may be function name, or \"*\" and an address.\n\
5959 If function is specified, break at end of code for that function.\n\
5960 If an address is specified, break at the end of the function that contains \n\
5961 that exact address.\n",
5962 "With no arg, uses current execution address of selected stack frame.\n\
5963 This is useful for breaking on return to a stack frame.\n\
5965 Multiple breakpoints at one place are permitted, and useful if conditional.\n\
5967 Do \"help breakpoints\" for info on other commands dealing with breakpoints.", NULL
)), NULL
);
5968 deprecate_cmd (add_com_alias ("xb", "xbreak", class_breakpoint
, 1), NULL
);
5969 deprecate_cmd (add_com_alias ("xbr", "xbreak", class_breakpoint
, 1), NULL
);
5970 deprecate_cmd (add_com_alias ("xbre", "xbreak", class_breakpoint
, 1), NULL
);
5971 deprecate_cmd (add_com_alias ("xbrea", "xbreak", class_breakpoint
, 1), NULL
);
5973 deprecate_cmd (c
= add_com ("txbreak", class_breakpoint
,
5974 tbreak_at_finish_command
,
5975 "Set temporary breakpoint at procedure exit. Either there should\n\
5976 be no argument or the argument must be a depth.\n"), NULL
);
5977 set_cmd_completer (c
, location_completer
);
5980 deprecate_cmd (add_com ("bx", class_breakpoint
,
5981 break_at_finish_at_depth_command
,
5982 "Set breakpoint at procedure exit. Either there should\n\
5983 be no argument or the argument must be a depth.\n"), NULL
);