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, 2005 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. */
31 #include "completer.h"
33 #include "gdb_assert.h"
34 #include "arch-utils.h"
35 /* For argument passing to the inferior */
38 #include "trad-frame.h"
39 #include "frame-unwind.h"
40 #include "frame-base.h"
45 #include "hppa-tdep.h"
47 static int hppa_debug
= 0;
49 /* Some local constants. */
50 static const int hppa32_num_regs
= 128;
51 static const int hppa64_num_regs
= 96;
53 /* hppa-specific object data -- unwind and solib info.
54 TODO/maybe: think about splitting this into two parts; the unwind data is
55 common to all hppa targets, but is only used in this file; we can register
56 that separately and make this static. The solib data is probably hpux-
57 specific, so we can create a separate extern objfile_data that is registered
58 by hppa-hpux-tdep.c and shared with pa64solib.c and somsolib.c. */
59 const struct objfile_data
*hppa_objfile_priv_data
= NULL
;
61 /* Get at various relevent fields of an instruction word. */
64 #define MASK_14 0x3fff
65 #define MASK_21 0x1fffff
67 /* Sizes (in bytes) of the native unwind entries. */
68 #define UNWIND_ENTRY_SIZE 16
69 #define STUB_UNWIND_ENTRY_SIZE 8
71 /* FIXME: brobecker 2002-11-07: We will likely be able to make the
72 following functions static, once we hppa is partially multiarched. */
73 int hppa_pc_requires_run_before_use (CORE_ADDR pc
);
75 /* Routines to extract various sized constants out of hppa
78 /* This assumes that no garbage lies outside of the lower bits of
82 hppa_sign_extend (unsigned val
, unsigned bits
)
84 return (int) (val
>> (bits
- 1) ? (-1 << bits
) | val
: val
);
87 /* For many immediate values the sign bit is the low bit! */
90 hppa_low_hppa_sign_extend (unsigned val
, unsigned bits
)
92 return (int) ((val
& 0x1 ? (-1 << (bits
- 1)) : 0) | val
>> 1);
95 /* Extract the bits at positions between FROM and TO, using HP's numbering
99 hppa_get_field (unsigned word
, int from
, int to
)
101 return ((word
) >> (31 - (to
)) & ((1 << ((to
) - (from
) + 1)) - 1));
104 /* extract the immediate field from a ld{bhw}s instruction */
107 hppa_extract_5_load (unsigned word
)
109 return hppa_low_hppa_sign_extend (word
>> 16 & MASK_5
, 5);
112 /* extract the immediate field from a break instruction */
115 hppa_extract_5r_store (unsigned word
)
117 return (word
& MASK_5
);
120 /* extract the immediate field from a {sr}sm instruction */
123 hppa_extract_5R_store (unsigned word
)
125 return (word
>> 16 & MASK_5
);
128 /* extract a 14 bit immediate field */
131 hppa_extract_14 (unsigned word
)
133 return hppa_low_hppa_sign_extend (word
& MASK_14
, 14);
136 /* extract a 21 bit constant */
139 hppa_extract_21 (unsigned word
)
145 val
= hppa_get_field (word
, 20, 20);
147 val
|= hppa_get_field (word
, 9, 19);
149 val
|= hppa_get_field (word
, 5, 6);
151 val
|= hppa_get_field (word
, 0, 4);
153 val
|= hppa_get_field (word
, 7, 8);
154 return hppa_sign_extend (val
, 21) << 11;
157 /* extract a 17 bit constant from branch instructions, returning the
158 19 bit signed value. */
161 hppa_extract_17 (unsigned word
)
163 return hppa_sign_extend (hppa_get_field (word
, 19, 28) |
164 hppa_get_field (word
, 29, 29) << 10 |
165 hppa_get_field (word
, 11, 15) << 11 |
166 (word
& 0x1) << 16, 17) << 2;
170 hppa_symbol_address(const char *sym
)
172 struct minimal_symbol
*minsym
;
174 minsym
= lookup_minimal_symbol (sym
, NULL
, NULL
);
176 return SYMBOL_VALUE_ADDRESS (minsym
);
178 return (CORE_ADDR
)-1;
181 struct hppa_objfile_private
*
182 hppa_init_objfile_priv_data (struct objfile
*objfile
)
184 struct hppa_objfile_private
*priv
;
186 priv
= (struct hppa_objfile_private
*)
187 obstack_alloc (&objfile
->objfile_obstack
,
188 sizeof (struct hppa_objfile_private
));
189 set_objfile_data (objfile
, hppa_objfile_priv_data
, priv
);
190 memset (priv
, 0, sizeof (*priv
));
196 /* Compare the start address for two unwind entries returning 1 if
197 the first address is larger than the second, -1 if the second is
198 larger than the first, and zero if they are equal. */
201 compare_unwind_entries (const void *arg1
, const void *arg2
)
203 const struct unwind_table_entry
*a
= arg1
;
204 const struct unwind_table_entry
*b
= arg2
;
206 if (a
->region_start
> b
->region_start
)
208 else if (a
->region_start
< b
->region_start
)
215 record_text_segment_lowaddr (bfd
*abfd
, asection
*section
, void *data
)
217 if ((section
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
))
218 == (SEC_ALLOC
| SEC_LOAD
| SEC_READONLY
))
220 bfd_vma value
= section
->vma
- section
->filepos
;
221 CORE_ADDR
*low_text_segment_address
= (CORE_ADDR
*)data
;
223 if (value
< *low_text_segment_address
)
224 *low_text_segment_address
= value
;
229 internalize_unwinds (struct objfile
*objfile
, struct unwind_table_entry
*table
,
230 asection
*section
, unsigned int entries
, unsigned int size
,
231 CORE_ADDR text_offset
)
233 /* We will read the unwind entries into temporary memory, then
234 fill in the actual unwind table. */
240 char *buf
= alloca (size
);
241 CORE_ADDR low_text_segment_address
;
243 /* For ELF targets, then unwinds are supposed to
244 be segment relative offsets instead of absolute addresses.
246 Note that when loading a shared library (text_offset != 0) the
247 unwinds are already relative to the text_offset that will be
249 if (gdbarch_tdep (current_gdbarch
)->is_elf
&& text_offset
== 0)
251 low_text_segment_address
= -1;
253 bfd_map_over_sections (objfile
->obfd
,
254 record_text_segment_lowaddr
,
255 &low_text_segment_address
);
257 text_offset
= low_text_segment_address
;
259 else if (gdbarch_tdep (current_gdbarch
)->solib_get_text_base
)
261 text_offset
= gdbarch_tdep (current_gdbarch
)->solib_get_text_base (objfile
);
264 bfd_get_section_contents (objfile
->obfd
, section
, buf
, 0, size
);
266 /* Now internalize the information being careful to handle host/target
268 for (i
= 0; i
< entries
; i
++)
270 table
[i
].region_start
= bfd_get_32 (objfile
->obfd
,
272 table
[i
].region_start
+= text_offset
;
274 table
[i
].region_end
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) buf
);
275 table
[i
].region_end
+= text_offset
;
277 tmp
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) buf
);
279 table
[i
].Cannot_unwind
= (tmp
>> 31) & 0x1;
280 table
[i
].Millicode
= (tmp
>> 30) & 0x1;
281 table
[i
].Millicode_save_sr0
= (tmp
>> 29) & 0x1;
282 table
[i
].Region_description
= (tmp
>> 27) & 0x3;
283 table
[i
].reserved1
= (tmp
>> 26) & 0x1;
284 table
[i
].Entry_SR
= (tmp
>> 25) & 0x1;
285 table
[i
].Entry_FR
= (tmp
>> 21) & 0xf;
286 table
[i
].Entry_GR
= (tmp
>> 16) & 0x1f;
287 table
[i
].Args_stored
= (tmp
>> 15) & 0x1;
288 table
[i
].Variable_Frame
= (tmp
>> 14) & 0x1;
289 table
[i
].Separate_Package_Body
= (tmp
>> 13) & 0x1;
290 table
[i
].Frame_Extension_Millicode
= (tmp
>> 12) & 0x1;
291 table
[i
].Stack_Overflow_Check
= (tmp
>> 11) & 0x1;
292 table
[i
].Two_Instruction_SP_Increment
= (tmp
>> 10) & 0x1;
293 table
[i
].Ada_Region
= (tmp
>> 9) & 0x1;
294 table
[i
].cxx_info
= (tmp
>> 8) & 0x1;
295 table
[i
].cxx_try_catch
= (tmp
>> 7) & 0x1;
296 table
[i
].sched_entry_seq
= (tmp
>> 6) & 0x1;
297 table
[i
].reserved2
= (tmp
>> 5) & 0x1;
298 table
[i
].Save_SP
= (tmp
>> 4) & 0x1;
299 table
[i
].Save_RP
= (tmp
>> 3) & 0x1;
300 table
[i
].Save_MRP_in_frame
= (tmp
>> 2) & 0x1;
301 table
[i
].extn_ptr_defined
= (tmp
>> 1) & 0x1;
302 table
[i
].Cleanup_defined
= tmp
& 0x1;
303 tmp
= bfd_get_32 (objfile
->obfd
, (bfd_byte
*) buf
);
305 table
[i
].MPE_XL_interrupt_marker
= (tmp
>> 31) & 0x1;
306 table
[i
].HP_UX_interrupt_marker
= (tmp
>> 30) & 0x1;
307 table
[i
].Large_frame
= (tmp
>> 29) & 0x1;
308 table
[i
].Pseudo_SP_Set
= (tmp
>> 28) & 0x1;
309 table
[i
].reserved4
= (tmp
>> 27) & 0x1;
310 table
[i
].Total_frame_size
= tmp
& 0x7ffffff;
312 /* Stub unwinds are handled elsewhere. */
313 table
[i
].stub_unwind
.stub_type
= 0;
314 table
[i
].stub_unwind
.padding
= 0;
319 /* Read in the backtrace information stored in the `$UNWIND_START$' section of
320 the object file. This info is used mainly by find_unwind_entry() to find
321 out the stack frame size and frame pointer used by procedures. We put
322 everything on the psymbol obstack in the objfile so that it automatically
323 gets freed when the objfile is destroyed. */
326 read_unwind_info (struct objfile
*objfile
)
328 asection
*unwind_sec
, *stub_unwind_sec
;
329 unsigned unwind_size
, stub_unwind_size
, total_size
;
330 unsigned index
, unwind_entries
;
331 unsigned stub_entries
, total_entries
;
332 CORE_ADDR text_offset
;
333 struct hppa_unwind_info
*ui
;
334 struct hppa_objfile_private
*obj_private
;
336 text_offset
= ANOFFSET (objfile
->section_offsets
, 0);
337 ui
= (struct hppa_unwind_info
*) obstack_alloc (&objfile
->objfile_obstack
,
338 sizeof (struct hppa_unwind_info
));
344 /* For reasons unknown the HP PA64 tools generate multiple unwinder
345 sections in a single executable. So we just iterate over every
346 section in the BFD looking for unwinder sections intead of trying
347 to do a lookup with bfd_get_section_by_name.
349 First determine the total size of the unwind tables so that we
350 can allocate memory in a nice big hunk. */
352 for (unwind_sec
= objfile
->obfd
->sections
;
354 unwind_sec
= unwind_sec
->next
)
356 if (strcmp (unwind_sec
->name
, "$UNWIND_START$") == 0
357 || strcmp (unwind_sec
->name
, ".PARISC.unwind") == 0)
359 unwind_size
= bfd_section_size (objfile
->obfd
, unwind_sec
);
360 unwind_entries
= unwind_size
/ UNWIND_ENTRY_SIZE
;
362 total_entries
+= unwind_entries
;
366 /* Now compute the size of the stub unwinds. Note the ELF tools do not
367 use stub unwinds at the curren time. */
368 stub_unwind_sec
= bfd_get_section_by_name (objfile
->obfd
, "$UNWIND_END$");
372 stub_unwind_size
= bfd_section_size (objfile
->obfd
, stub_unwind_sec
);
373 stub_entries
= stub_unwind_size
/ STUB_UNWIND_ENTRY_SIZE
;
377 stub_unwind_size
= 0;
381 /* Compute total number of unwind entries and their total size. */
382 total_entries
+= stub_entries
;
383 total_size
= total_entries
* sizeof (struct unwind_table_entry
);
385 /* Allocate memory for the unwind table. */
386 ui
->table
= (struct unwind_table_entry
*)
387 obstack_alloc (&objfile
->objfile_obstack
, total_size
);
388 ui
->last
= total_entries
- 1;
390 /* Now read in each unwind section and internalize the standard unwind
393 for (unwind_sec
= objfile
->obfd
->sections
;
395 unwind_sec
= unwind_sec
->next
)
397 if (strcmp (unwind_sec
->name
, "$UNWIND_START$") == 0
398 || strcmp (unwind_sec
->name
, ".PARISC.unwind") == 0)
400 unwind_size
= bfd_section_size (objfile
->obfd
, unwind_sec
);
401 unwind_entries
= unwind_size
/ UNWIND_ENTRY_SIZE
;
403 internalize_unwinds (objfile
, &ui
->table
[index
], unwind_sec
,
404 unwind_entries
, unwind_size
, text_offset
);
405 index
+= unwind_entries
;
409 /* Now read in and internalize the stub unwind entries. */
410 if (stub_unwind_size
> 0)
413 char *buf
= alloca (stub_unwind_size
);
415 /* Read in the stub unwind entries. */
416 bfd_get_section_contents (objfile
->obfd
, stub_unwind_sec
, buf
,
417 0, stub_unwind_size
);
419 /* Now convert them into regular unwind entries. */
420 for (i
= 0; i
< stub_entries
; i
++, index
++)
422 /* Clear out the next unwind entry. */
423 memset (&ui
->table
[index
], 0, sizeof (struct unwind_table_entry
));
425 /* Convert offset & size into region_start and region_end.
426 Stuff away the stub type into "reserved" fields. */
427 ui
->table
[index
].region_start
= bfd_get_32 (objfile
->obfd
,
429 ui
->table
[index
].region_start
+= text_offset
;
431 ui
->table
[index
].stub_unwind
.stub_type
= bfd_get_8 (objfile
->obfd
,
434 ui
->table
[index
].region_end
435 = ui
->table
[index
].region_start
+ 4 *
436 (bfd_get_16 (objfile
->obfd
, (bfd_byte
*) buf
) - 1);
442 /* Unwind table needs to be kept sorted. */
443 qsort (ui
->table
, total_entries
, sizeof (struct unwind_table_entry
),
444 compare_unwind_entries
);
446 /* Keep a pointer to the unwind information. */
447 obj_private
= (struct hppa_objfile_private
*)
448 objfile_data (objfile
, hppa_objfile_priv_data
);
449 if (obj_private
== NULL
)
450 obj_private
= hppa_init_objfile_priv_data (objfile
);
452 obj_private
->unwind_info
= ui
;
455 /* Lookup the unwind (stack backtrace) info for the given PC. We search all
456 of the objfiles seeking the unwind table entry for this PC. Each objfile
457 contains a sorted list of struct unwind_table_entry. Since we do a binary
458 search of the unwind tables, we depend upon them to be sorted. */
460 struct unwind_table_entry
*
461 find_unwind_entry (CORE_ADDR pc
)
463 int first
, middle
, last
;
464 struct objfile
*objfile
;
465 struct hppa_objfile_private
*priv
;
468 fprintf_unfiltered (gdb_stdlog
, "{ find_unwind_entry 0x%s -> ",
471 /* A function at address 0? Not in HP-UX! */
472 if (pc
== (CORE_ADDR
) 0)
475 fprintf_unfiltered (gdb_stdlog
, "NULL }\n");
479 ALL_OBJFILES (objfile
)
481 struct hppa_unwind_info
*ui
;
483 priv
= objfile_data (objfile
, hppa_objfile_priv_data
);
485 ui
= ((struct hppa_objfile_private
*) priv
)->unwind_info
;
489 read_unwind_info (objfile
);
490 priv
= objfile_data (objfile
, hppa_objfile_priv_data
);
492 error (_("Internal error reading unwind information."));
493 ui
= ((struct hppa_objfile_private
*) priv
)->unwind_info
;
496 /* First, check the cache */
499 && pc
>= ui
->cache
->region_start
500 && pc
<= ui
->cache
->region_end
)
503 fprintf_unfiltered (gdb_stdlog
, "0x%s (cached) }\n",
504 paddr_nz ((CORE_ADDR
) ui
->cache
));
508 /* Not in the cache, do a binary search */
513 while (first
<= last
)
515 middle
= (first
+ last
) / 2;
516 if (pc
>= ui
->table
[middle
].region_start
517 && pc
<= ui
->table
[middle
].region_end
)
519 ui
->cache
= &ui
->table
[middle
];
521 fprintf_unfiltered (gdb_stdlog
, "0x%s }\n",
522 paddr_nz ((CORE_ADDR
) ui
->cache
));
523 return &ui
->table
[middle
];
526 if (pc
< ui
->table
[middle
].region_start
)
531 } /* ALL_OBJFILES() */
534 fprintf_unfiltered (gdb_stdlog
, "NULL (not found) }\n");
539 /* The epilogue is defined here as the area either on the `bv' instruction
540 itself or an instruction which destroys the function's stack frame.
542 We do not assume that the epilogue is at the end of a function as we can
543 also have return sequences in the middle of a function. */
545 hppa_in_function_epilogue_p (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
547 unsigned long status
;
552 status
= deprecated_read_memory_nobpt (pc
, buf
, 4);
556 inst
= extract_unsigned_integer (buf
, 4);
558 /* The most common way to perform a stack adjustment ldo X(sp),sp
559 We are destroying a stack frame if the offset is negative. */
560 if ((inst
& 0xffffc000) == 0x37de0000
561 && hppa_extract_14 (inst
) < 0)
564 /* ldw,mb D(sp),X or ldd,mb D(sp),X */
565 if (((inst
& 0x0fc010e0) == 0x0fc010e0
566 || (inst
& 0x0fc010e0) == 0x0fc010e0)
567 && hppa_extract_14 (inst
) < 0)
570 /* bv %r0(%rp) or bv,n %r0(%rp) */
571 if (inst
== 0xe840c000 || inst
== 0xe840c002)
577 static const unsigned char *
578 hppa_breakpoint_from_pc (CORE_ADDR
*pc
, int *len
)
580 static const unsigned char breakpoint
[] = {0x00, 0x01, 0x00, 0x04};
581 (*len
) = sizeof (breakpoint
);
585 /* Return the name of a register. */
588 hppa32_register_name (int i
)
590 static char *names
[] = {
591 "flags", "r1", "rp", "r3",
592 "r4", "r5", "r6", "r7",
593 "r8", "r9", "r10", "r11",
594 "r12", "r13", "r14", "r15",
595 "r16", "r17", "r18", "r19",
596 "r20", "r21", "r22", "r23",
597 "r24", "r25", "r26", "dp",
598 "ret0", "ret1", "sp", "r31",
599 "sar", "pcoqh", "pcsqh", "pcoqt",
600 "pcsqt", "eiem", "iir", "isr",
601 "ior", "ipsw", "goto", "sr4",
602 "sr0", "sr1", "sr2", "sr3",
603 "sr5", "sr6", "sr7", "cr0",
604 "cr8", "cr9", "ccr", "cr12",
605 "cr13", "cr24", "cr25", "cr26",
606 "mpsfu_high","mpsfu_low","mpsfu_ovflo","pad",
607 "fpsr", "fpe1", "fpe2", "fpe3",
608 "fpe4", "fpe5", "fpe6", "fpe7",
609 "fr4", "fr4R", "fr5", "fr5R",
610 "fr6", "fr6R", "fr7", "fr7R",
611 "fr8", "fr8R", "fr9", "fr9R",
612 "fr10", "fr10R", "fr11", "fr11R",
613 "fr12", "fr12R", "fr13", "fr13R",
614 "fr14", "fr14R", "fr15", "fr15R",
615 "fr16", "fr16R", "fr17", "fr17R",
616 "fr18", "fr18R", "fr19", "fr19R",
617 "fr20", "fr20R", "fr21", "fr21R",
618 "fr22", "fr22R", "fr23", "fr23R",
619 "fr24", "fr24R", "fr25", "fr25R",
620 "fr26", "fr26R", "fr27", "fr27R",
621 "fr28", "fr28R", "fr29", "fr29R",
622 "fr30", "fr30R", "fr31", "fr31R"
624 if (i
< 0 || i
>= (sizeof (names
) / sizeof (*names
)))
631 hppa64_register_name (int i
)
633 static char *names
[] = {
634 "flags", "r1", "rp", "r3",
635 "r4", "r5", "r6", "r7",
636 "r8", "r9", "r10", "r11",
637 "r12", "r13", "r14", "r15",
638 "r16", "r17", "r18", "r19",
639 "r20", "r21", "r22", "r23",
640 "r24", "r25", "r26", "dp",
641 "ret0", "ret1", "sp", "r31",
642 "sar", "pcoqh", "pcsqh", "pcoqt",
643 "pcsqt", "eiem", "iir", "isr",
644 "ior", "ipsw", "goto", "sr4",
645 "sr0", "sr1", "sr2", "sr3",
646 "sr5", "sr6", "sr7", "cr0",
647 "cr8", "cr9", "ccr", "cr12",
648 "cr13", "cr24", "cr25", "cr26",
649 "mpsfu_high","mpsfu_low","mpsfu_ovflo","pad",
650 "fpsr", "fpe1", "fpe2", "fpe3",
651 "fr4", "fr5", "fr6", "fr7",
652 "fr8", "fr9", "fr10", "fr11",
653 "fr12", "fr13", "fr14", "fr15",
654 "fr16", "fr17", "fr18", "fr19",
655 "fr20", "fr21", "fr22", "fr23",
656 "fr24", "fr25", "fr26", "fr27",
657 "fr28", "fr29", "fr30", "fr31"
659 if (i
< 0 || i
>= (sizeof (names
) / sizeof (*names
)))
665 /* This function pushes a stack frame with arguments as part of the
666 inferior function calling mechanism.
668 This is the version of the function for the 32-bit PA machines, in
669 which later arguments appear at lower addresses. (The stack always
670 grows towards higher addresses.)
672 We simply allocate the appropriate amount of stack space and put
673 arguments into their proper slots. */
676 hppa32_push_dummy_call (struct gdbarch
*gdbarch
, struct value
*function
,
677 struct regcache
*regcache
, CORE_ADDR bp_addr
,
678 int nargs
, struct value
**args
, CORE_ADDR sp
,
679 int struct_return
, CORE_ADDR struct_addr
)
681 /* Stack base address at which any pass-by-reference parameters are
683 CORE_ADDR struct_end
= 0;
684 /* Stack base address at which the first parameter is stored. */
685 CORE_ADDR param_end
= 0;
687 /* The inner most end of the stack after all the parameters have
689 CORE_ADDR new_sp
= 0;
691 /* Two passes. First pass computes the location of everything,
692 second pass writes the bytes out. */
695 /* Global pointer (r19) of the function we are trying to call. */
698 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
700 for (write_pass
= 0; write_pass
< 2; write_pass
++)
702 CORE_ADDR struct_ptr
= 0;
703 /* The first parameter goes into sp-36, each stack slot is 4-bytes.
704 struct_ptr is adjusted for each argument below, so the first
705 argument will end up at sp-36. */
706 CORE_ADDR param_ptr
= 32;
708 int small_struct
= 0;
710 for (i
= 0; i
< nargs
; i
++)
712 struct value
*arg
= args
[i
];
713 struct type
*type
= check_typedef (value_type (arg
));
714 /* The corresponding parameter that is pushed onto the
715 stack, and [possibly] passed in a register. */
718 memset (param_val
, 0, sizeof param_val
);
719 if (TYPE_LENGTH (type
) > 8)
721 /* Large parameter, pass by reference. Store the value
722 in "struct" area and then pass its address. */
724 struct_ptr
+= align_up (TYPE_LENGTH (type
), 8);
726 write_memory (struct_end
- struct_ptr
, value_contents (arg
),
728 store_unsigned_integer (param_val
, 4, struct_end
- struct_ptr
);
730 else if (TYPE_CODE (type
) == TYPE_CODE_INT
731 || TYPE_CODE (type
) == TYPE_CODE_ENUM
)
733 /* Integer value store, right aligned. "unpack_long"
734 takes care of any sign-extension problems. */
735 param_len
= align_up (TYPE_LENGTH (type
), 4);
736 store_unsigned_integer (param_val
, param_len
,
738 value_contents (arg
)));
740 else if (TYPE_CODE (type
) == TYPE_CODE_FLT
)
742 /* Floating point value store, right aligned. */
743 param_len
= align_up (TYPE_LENGTH (type
), 4);
744 memcpy (param_val
, value_contents (arg
), param_len
);
748 param_len
= align_up (TYPE_LENGTH (type
), 4);
750 /* Small struct value are stored right-aligned. */
751 memcpy (param_val
+ param_len
- TYPE_LENGTH (type
),
752 value_contents (arg
), TYPE_LENGTH (type
));
754 /* Structures of size 5, 6 and 7 bytes are special in that
755 the higher-ordered word is stored in the lower-ordered
756 argument, and even though it is a 8-byte quantity the
757 registers need not be 8-byte aligned. */
758 if (param_len
> 4 && param_len
< 8)
762 param_ptr
+= param_len
;
763 if (param_len
== 8 && !small_struct
)
764 param_ptr
= align_up (param_ptr
, 8);
766 /* First 4 non-FP arguments are passed in gr26-gr23.
767 First 4 32-bit FP arguments are passed in fr4L-fr7L.
768 First 2 64-bit FP arguments are passed in fr5 and fr7.
770 The rest go on the stack, starting at sp-36, towards lower
771 addresses. 8-byte arguments must be aligned to a 8-byte
775 write_memory (param_end
- param_ptr
, param_val
, param_len
);
777 /* There are some cases when we don't know the type
778 expected by the callee (e.g. for variadic functions), so
779 pass the parameters in both general and fp regs. */
782 int grreg
= 26 - (param_ptr
- 36) / 4;
783 int fpLreg
= 72 + (param_ptr
- 36) / 4 * 2;
784 int fpreg
= 74 + (param_ptr
- 32) / 8 * 4;
786 regcache_cooked_write (regcache
, grreg
, param_val
);
787 regcache_cooked_write (regcache
, fpLreg
, param_val
);
791 regcache_cooked_write (regcache
, grreg
+ 1,
794 regcache_cooked_write (regcache
, fpreg
, param_val
);
795 regcache_cooked_write (regcache
, fpreg
+ 1,
802 /* Update the various stack pointers. */
805 struct_end
= sp
+ align_up (struct_ptr
, 64);
806 /* PARAM_PTR already accounts for all the arguments passed
807 by the user. However, the ABI mandates minimum stack
808 space allocations for outgoing arguments. The ABI also
809 mandates minimum stack alignments which we must
811 param_end
= struct_end
+ align_up (param_ptr
, 64);
815 /* If a structure has to be returned, set up register 28 to hold its
818 write_register (28, struct_addr
);
820 gp
= tdep
->find_global_pointer (function
);
823 write_register (19, gp
);
825 /* Set the return address. */
826 if (!gdbarch_push_dummy_code_p (gdbarch
))
827 regcache_cooked_write_unsigned (regcache
, HPPA_RP_REGNUM
, bp_addr
);
829 /* Update the Stack Pointer. */
830 regcache_cooked_write_unsigned (regcache
, HPPA_SP_REGNUM
, param_end
);
835 /* The 64-bit PA-RISC calling conventions are documented in "64-Bit
836 Runtime Architecture for PA-RISC 2.0", which is distributed as part
837 as of the HP-UX Software Transition Kit (STK). This implementation
838 is based on version 3.3, dated October 6, 1997. */
840 /* Check whether TYPE is an "Integral or Pointer Scalar Type". */
843 hppa64_integral_or_pointer_p (const struct type
*type
)
845 switch (TYPE_CODE (type
))
851 case TYPE_CODE_RANGE
:
853 int len
= TYPE_LENGTH (type
);
854 return (len
== 1 || len
== 2 || len
== 4 || len
== 8);
858 return (TYPE_LENGTH (type
) == 8);
866 /* Check whether TYPE is a "Floating Scalar Type". */
869 hppa64_floating_p (const struct type
*type
)
871 switch (TYPE_CODE (type
))
875 int len
= TYPE_LENGTH (type
);
876 return (len
== 4 || len
== 8 || len
== 16);
886 hppa64_push_dummy_call (struct gdbarch
*gdbarch
, struct value
*function
,
887 struct regcache
*regcache
, CORE_ADDR bp_addr
,
888 int nargs
, struct value
**args
, CORE_ADDR sp
,
889 int struct_return
, CORE_ADDR struct_addr
)
891 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
895 /* "The outgoing parameter area [...] must be aligned at a 16-byte
897 sp
= align_up (sp
, 16);
899 for (i
= 0; i
< nargs
; i
++)
901 struct value
*arg
= args
[i
];
902 struct type
*type
= value_type (arg
);
903 int len
= TYPE_LENGTH (type
);
904 const bfd_byte
*valbuf
;
907 /* "Each parameter begins on a 64-bit (8-byte) boundary." */
908 offset
= align_up (offset
, 8);
910 if (hppa64_integral_or_pointer_p (type
))
912 /* "Integral scalar parameters smaller than 64 bits are
913 padded on the left (i.e., the value is in the
914 least-significant bits of the 64-bit storage unit, and
915 the high-order bits are undefined)." Therefore we can
916 safely sign-extend them. */
919 arg
= value_cast (builtin_type_int64
, arg
);
923 else if (hppa64_floating_p (type
))
927 /* "Quad-precision (128-bit) floating-point scalar
928 parameters are aligned on a 16-byte boundary." */
929 offset
= align_up (offset
, 16);
931 /* "Double-extended- and quad-precision floating-point
932 parameters within the first 64 bytes of the parameter
933 list are always passed in general registers." */
939 /* "Single-precision (32-bit) floating-point scalar
940 parameters are padded on the left with 32 bits of
941 garbage (i.e., the floating-point value is in the
942 least-significant 32 bits of a 64-bit storage
947 /* "Single- and double-precision floating-point
948 parameters in this area are passed according to the
949 available formal parameter information in a function
950 prototype. [...] If no prototype is in scope,
951 floating-point parameters must be passed both in the
952 corresponding general registers and in the
953 corresponding floating-point registers." */
954 regnum
= HPPA64_FP4_REGNUM
+ offset
/ 8;
956 if (regnum
< HPPA64_FP4_REGNUM
+ 8)
958 /* "Single-precision floating-point parameters, when
959 passed in floating-point registers, are passed in
960 the right halves of the floating point registers;
961 the left halves are unused." */
962 regcache_cooked_write_part (regcache
, regnum
, offset
% 8,
963 len
, value_contents (arg
));
971 /* "Aggregates larger than 8 bytes are aligned on a
972 16-byte boundary, possibly leaving an unused argument
973 slot, which is filled with garbage. If necessary,
974 they are padded on the right (with garbage), to a
975 multiple of 8 bytes." */
976 offset
= align_up (offset
, 16);
980 /* Always store the argument in memory. */
981 write_memory (sp
+ offset
, value_contents (arg
), len
);
983 valbuf
= value_contents (arg
);
984 regnum
= HPPA_ARG0_REGNUM
- offset
/ 8;
985 while (regnum
> HPPA_ARG0_REGNUM
- 8 && len
> 0)
987 regcache_cooked_write_part (regcache
, regnum
,
988 offset
% 8, min (len
, 8), valbuf
);
989 offset
+= min (len
, 8);
990 valbuf
+= min (len
, 8);
998 /* Set up GR29 (%ret1) to hold the argument pointer (ap). */
999 regcache_cooked_write_unsigned (regcache
, HPPA_RET1_REGNUM
, sp
+ 64);
1001 /* Allocate the outgoing parameter area. Make sure the outgoing
1002 parameter area is multiple of 16 bytes in length. */
1003 sp
+= max (align_up (offset
, 16), 64);
1005 /* Allocate 32-bytes of scratch space. The documentation doesn't
1006 mention this, but it seems to be needed. */
1009 /* Allocate the frame marker area. */
1012 /* If a structure has to be returned, set up GR 28 (%ret0) to hold
1015 regcache_cooked_write_unsigned (regcache
, HPPA_RET0_REGNUM
, struct_addr
);
1017 /* Set up GR27 (%dp) to hold the global pointer (gp). */
1018 gp
= tdep
->find_global_pointer (function
);
1020 regcache_cooked_write_unsigned (regcache
, HPPA_DP_REGNUM
, gp
);
1022 /* Set up GR2 (%rp) to hold the return pointer (rp). */
1023 if (!gdbarch_push_dummy_code_p (gdbarch
))
1024 regcache_cooked_write_unsigned (regcache
, HPPA_RP_REGNUM
, bp_addr
);
1026 /* Set up GR30 to hold the stack pointer (sp). */
1027 regcache_cooked_write_unsigned (regcache
, HPPA_SP_REGNUM
, sp
);
1033 /* Handle 32/64-bit struct return conventions. */
1035 static enum return_value_convention
1036 hppa32_return_value (struct gdbarch
*gdbarch
,
1037 struct type
*type
, struct regcache
*regcache
,
1038 gdb_byte
*readbuf
, const gdb_byte
*writebuf
)
1040 if (TYPE_LENGTH (type
) <= 2 * 4)
1042 /* The value always lives in the right hand end of the register
1043 (or register pair)? */
1045 int reg
= TYPE_CODE (type
) == TYPE_CODE_FLT
? HPPA_FP4_REGNUM
: 28;
1046 int part
= TYPE_LENGTH (type
) % 4;
1047 /* The left hand register contains only part of the value,
1048 transfer that first so that the rest can be xfered as entire
1049 4-byte registers. */
1052 if (readbuf
!= NULL
)
1053 regcache_cooked_read_part (regcache
, reg
, 4 - part
,
1055 if (writebuf
!= NULL
)
1056 regcache_cooked_write_part (regcache
, reg
, 4 - part
,
1060 /* Now transfer the remaining register values. */
1061 for (b
= part
; b
< TYPE_LENGTH (type
); b
+= 4)
1063 if (readbuf
!= NULL
)
1064 regcache_cooked_read (regcache
, reg
, readbuf
+ b
);
1065 if (writebuf
!= NULL
)
1066 regcache_cooked_write (regcache
, reg
, writebuf
+ b
);
1069 return RETURN_VALUE_REGISTER_CONVENTION
;
1072 return RETURN_VALUE_STRUCT_CONVENTION
;
1075 static enum return_value_convention
1076 hppa64_return_value (struct gdbarch
*gdbarch
,
1077 struct type
*type
, struct regcache
*regcache
,
1078 gdb_byte
*readbuf
, const gdb_byte
*writebuf
)
1080 int len
= TYPE_LENGTH (type
);
1085 /* All return values larget than 128 bits must be aggregate
1087 gdb_assert (!hppa64_integral_or_pointer_p (type
));
1088 gdb_assert (!hppa64_floating_p (type
));
1090 /* "Aggregate return values larger than 128 bits are returned in
1091 a buffer allocated by the caller. The address of the buffer
1092 must be passed in GR 28." */
1093 return RETURN_VALUE_STRUCT_CONVENTION
;
1096 if (hppa64_integral_or_pointer_p (type
))
1098 /* "Integral return values are returned in GR 28. Values
1099 smaller than 64 bits are padded on the left (with garbage)." */
1100 regnum
= HPPA_RET0_REGNUM
;
1103 else if (hppa64_floating_p (type
))
1107 /* "Double-extended- and quad-precision floating-point
1108 values are returned in GRs 28 and 29. The sign,
1109 exponent, and most-significant bits of the mantissa are
1110 returned in GR 28; the least-significant bits of the
1111 mantissa are passed in GR 29. For double-extended
1112 precision values, GR 29 is padded on the right with 48
1113 bits of garbage." */
1114 regnum
= HPPA_RET0_REGNUM
;
1119 /* "Single-precision and double-precision floating-point
1120 return values are returned in FR 4R (single precision) or
1121 FR 4 (double-precision)." */
1122 regnum
= HPPA64_FP4_REGNUM
;
1128 /* "Aggregate return values up to 64 bits in size are returned
1129 in GR 28. Aggregates smaller than 64 bits are left aligned
1130 in the register; the pad bits on the right are undefined."
1132 "Aggregate return values between 65 and 128 bits are returned
1133 in GRs 28 and 29. The first 64 bits are placed in GR 28, and
1134 the remaining bits are placed, left aligned, in GR 29. The
1135 pad bits on the right of GR 29 (if any) are undefined." */
1136 regnum
= HPPA_RET0_REGNUM
;
1144 regcache_cooked_read_part (regcache
, regnum
, offset
,
1145 min (len
, 8), readbuf
);
1146 readbuf
+= min (len
, 8);
1147 len
-= min (len
, 8);
1156 regcache_cooked_write_part (regcache
, regnum
, offset
,
1157 min (len
, 8), writebuf
);
1158 writebuf
+= min (len
, 8);
1159 len
-= min (len
, 8);
1164 return RETURN_VALUE_REGISTER_CONVENTION
;
1169 hppa32_convert_from_func_ptr_addr (struct gdbarch
*gdbarch
,
1171 struct target_ops
*targ
)
1178 target_read_memory(plabel
, (char *)&addr
, 4);
1185 hppa32_frame_align (struct gdbarch
*gdbarch
, CORE_ADDR addr
)
1187 /* HP frames are 64-byte (or cache line) aligned (yes that's _byte_
1189 return align_up (addr
, 64);
1192 /* Force all frames to 16-byte alignment. Better safe than sorry. */
1195 hppa64_frame_align (struct gdbarch
*gdbarch
, CORE_ADDR addr
)
1197 /* Just always 16-byte align. */
1198 return align_up (addr
, 16);
1202 hppa_read_pc (ptid_t ptid
)
1207 ipsw
= read_register_pid (HPPA_IPSW_REGNUM
, ptid
);
1208 pc
= read_register_pid (HPPA_PCOQ_HEAD_REGNUM
, ptid
);
1210 /* If the current instruction is nullified, then we are effectively
1211 still executing the previous instruction. Pretend we are still
1212 there. This is needed when single stepping; if the nullified
1213 instruction is on a different line, we don't want GDB to think
1214 we've stepped onto that line. */
1215 if (ipsw
& 0x00200000)
1222 hppa_write_pc (CORE_ADDR pc
, ptid_t ptid
)
1224 write_register_pid (HPPA_PCOQ_HEAD_REGNUM
, pc
, ptid
);
1225 write_register_pid (HPPA_PCOQ_TAIL_REGNUM
, pc
+ 4, ptid
);
1228 /* return the alignment of a type in bytes. Structures have the maximum
1229 alignment required by their fields. */
1232 hppa_alignof (struct type
*type
)
1234 int max_align
, align
, i
;
1235 CHECK_TYPEDEF (type
);
1236 switch (TYPE_CODE (type
))
1241 return TYPE_LENGTH (type
);
1242 case TYPE_CODE_ARRAY
:
1243 return hppa_alignof (TYPE_FIELD_TYPE (type
, 0));
1244 case TYPE_CODE_STRUCT
:
1245 case TYPE_CODE_UNION
:
1247 for (i
= 0; i
< TYPE_NFIELDS (type
); i
++)
1249 /* Bit fields have no real alignment. */
1250 /* if (!TYPE_FIELD_BITPOS (type, i)) */
1251 if (!TYPE_FIELD_BITSIZE (type
, i
)) /* elz: this should be bitsize */
1253 align
= hppa_alignof (TYPE_FIELD_TYPE (type
, i
));
1254 max_align
= max (max_align
, align
);
1263 /* For the given instruction (INST), return any adjustment it makes
1264 to the stack pointer or zero for no adjustment.
1266 This only handles instructions commonly found in prologues. */
1269 prologue_inst_adjust_sp (unsigned long inst
)
1271 /* This must persist across calls. */
1272 static int save_high21
;
1274 /* The most common way to perform a stack adjustment ldo X(sp),sp */
1275 if ((inst
& 0xffffc000) == 0x37de0000)
1276 return hppa_extract_14 (inst
);
1279 if ((inst
& 0xffe00000) == 0x6fc00000)
1280 return hppa_extract_14 (inst
);
1282 /* std,ma X,D(sp) */
1283 if ((inst
& 0xffe00008) == 0x73c00008)
1284 return (inst
& 0x1 ? -1 << 13 : 0) | (((inst
>> 4) & 0x3ff) << 3);
1286 /* addil high21,%r30; ldo low11,(%r1),%r30)
1287 save high bits in save_high21 for later use. */
1288 if ((inst
& 0xffe00000) == 0x2bc00000)
1290 save_high21
= hppa_extract_21 (inst
);
1294 if ((inst
& 0xffff0000) == 0x343e0000)
1295 return save_high21
+ hppa_extract_14 (inst
);
1297 /* fstws as used by the HP compilers. */
1298 if ((inst
& 0xffffffe0) == 0x2fd01220)
1299 return hppa_extract_5_load (inst
);
1301 /* No adjustment. */
1305 /* Return nonzero if INST is a branch of some kind, else return zero. */
1308 is_branch (unsigned long inst
)
1337 /* Return the register number for a GR which is saved by INST or
1338 zero it INST does not save a GR. */
1341 inst_saves_gr (unsigned long inst
)
1343 /* Does it look like a stw? */
1344 if ((inst
>> 26) == 0x1a || (inst
>> 26) == 0x1b
1345 || (inst
>> 26) == 0x1f
1346 || ((inst
>> 26) == 0x1f
1347 && ((inst
>> 6) == 0xa)))
1348 return hppa_extract_5R_store (inst
);
1350 /* Does it look like a std? */
1351 if ((inst
>> 26) == 0x1c
1352 || ((inst
>> 26) == 0x03
1353 && ((inst
>> 6) & 0xf) == 0xb))
1354 return hppa_extract_5R_store (inst
);
1356 /* Does it look like a stwm? GCC & HPC may use this in prologues. */
1357 if ((inst
>> 26) == 0x1b)
1358 return hppa_extract_5R_store (inst
);
1360 /* Does it look like sth or stb? HPC versions 9.0 and later use these
1362 if ((inst
>> 26) == 0x19 || (inst
>> 26) == 0x18
1363 || ((inst
>> 26) == 0x3
1364 && (((inst
>> 6) & 0xf) == 0x8
1365 || (inst
>> 6) & 0xf) == 0x9))
1366 return hppa_extract_5R_store (inst
);
1371 /* Return the register number for a FR which is saved by INST or
1372 zero it INST does not save a FR.
1374 Note we only care about full 64bit register stores (that's the only
1375 kind of stores the prologue will use).
1377 FIXME: What about argument stores with the HP compiler in ANSI mode? */
1380 inst_saves_fr (unsigned long inst
)
1382 /* is this an FSTD ? */
1383 if ((inst
& 0xfc00dfc0) == 0x2c001200)
1384 return hppa_extract_5r_store (inst
);
1385 if ((inst
& 0xfc000002) == 0x70000002)
1386 return hppa_extract_5R_store (inst
);
1387 /* is this an FSTW ? */
1388 if ((inst
& 0xfc00df80) == 0x24001200)
1389 return hppa_extract_5r_store (inst
);
1390 if ((inst
& 0xfc000002) == 0x7c000000)
1391 return hppa_extract_5R_store (inst
);
1395 /* Advance PC across any function entry prologue instructions
1396 to reach some "real" code.
1398 Use information in the unwind table to determine what exactly should
1399 be in the prologue. */
1403 skip_prologue_hard_way (CORE_ADDR pc
, int stop_before_branch
)
1406 CORE_ADDR orig_pc
= pc
;
1407 unsigned long inst
, stack_remaining
, save_gr
, save_fr
, save_rp
, save_sp
;
1408 unsigned long args_stored
, status
, i
, restart_gr
, restart_fr
;
1409 struct unwind_table_entry
*u
;
1410 int final_iteration
;
1416 u
= find_unwind_entry (pc
);
1420 /* If we are not at the beginning of a function, then return now. */
1421 if ((pc
& ~0x3) != u
->region_start
)
1424 /* This is how much of a frame adjustment we need to account for. */
1425 stack_remaining
= u
->Total_frame_size
<< 3;
1427 /* Magic register saves we want to know about. */
1428 save_rp
= u
->Save_RP
;
1429 save_sp
= u
->Save_SP
;
1431 /* An indication that args may be stored into the stack. Unfortunately
1432 the HPUX compilers tend to set this in cases where no args were
1436 /* Turn the Entry_GR field into a bitmask. */
1438 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
1440 /* Frame pointer gets saved into a special location. */
1441 if (u
->Save_SP
&& i
== HPPA_FP_REGNUM
)
1444 save_gr
|= (1 << i
);
1446 save_gr
&= ~restart_gr
;
1448 /* Turn the Entry_FR field into a bitmask too. */
1450 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
1451 save_fr
|= (1 << i
);
1452 save_fr
&= ~restart_fr
;
1454 final_iteration
= 0;
1456 /* Loop until we find everything of interest or hit a branch.
1458 For unoptimized GCC code and for any HP CC code this will never ever
1459 examine any user instructions.
1461 For optimzied GCC code we're faced with problems. GCC will schedule
1462 its prologue and make prologue instructions available for delay slot
1463 filling. The end result is user code gets mixed in with the prologue
1464 and a prologue instruction may be in the delay slot of the first branch
1467 Some unexpected things are expected with debugging optimized code, so
1468 we allow this routine to walk past user instructions in optimized
1470 while (save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0
1473 unsigned int reg_num
;
1474 unsigned long old_stack_remaining
, old_save_gr
, old_save_fr
;
1475 unsigned long old_save_rp
, old_save_sp
, next_inst
;
1477 /* Save copies of all the triggers so we can compare them later
1479 old_save_gr
= save_gr
;
1480 old_save_fr
= save_fr
;
1481 old_save_rp
= save_rp
;
1482 old_save_sp
= save_sp
;
1483 old_stack_remaining
= stack_remaining
;
1485 status
= deprecated_read_memory_nobpt (pc
, buf
, 4);
1486 inst
= extract_unsigned_integer (buf
, 4);
1492 /* Note the interesting effects of this instruction. */
1493 stack_remaining
-= prologue_inst_adjust_sp (inst
);
1495 /* There are limited ways to store the return pointer into the
1497 if (inst
== 0x6bc23fd9 || inst
== 0x0fc212c1)
1500 /* These are the only ways we save SP into the stack. At this time
1501 the HP compilers never bother to save SP into the stack. */
1502 if ((inst
& 0xffffc000) == 0x6fc10000
1503 || (inst
& 0xffffc00c) == 0x73c10008)
1506 /* Are we loading some register with an offset from the argument
1508 if ((inst
& 0xffe00000) == 0x37a00000
1509 || (inst
& 0xffffffe0) == 0x081d0240)
1515 /* Account for general and floating-point register saves. */
1516 reg_num
= inst_saves_gr (inst
);
1517 save_gr
&= ~(1 << reg_num
);
1519 /* Ugh. Also account for argument stores into the stack.
1520 Unfortunately args_stored only tells us that some arguments
1521 where stored into the stack. Not how many or what kind!
1523 This is a kludge as on the HP compiler sets this bit and it
1524 never does prologue scheduling. So once we see one, skip past
1525 all of them. We have similar code for the fp arg stores below.
1527 FIXME. Can still die if we have a mix of GR and FR argument
1529 if (reg_num
>= (TARGET_PTR_BIT
== 64 ? 19 : 23) && reg_num
<= 26)
1531 while (reg_num
>= (TARGET_PTR_BIT
== 64 ? 19 : 23) && reg_num
<= 26)
1534 status
= deprecated_read_memory_nobpt (pc
, buf
, 4);
1535 inst
= extract_unsigned_integer (buf
, 4);
1538 reg_num
= inst_saves_gr (inst
);
1544 reg_num
= inst_saves_fr (inst
);
1545 save_fr
&= ~(1 << reg_num
);
1547 status
= deprecated_read_memory_nobpt (pc
+ 4, buf
, 4);
1548 next_inst
= extract_unsigned_integer (buf
, 4);
1554 /* We've got to be read to handle the ldo before the fp register
1556 if ((inst
& 0xfc000000) == 0x34000000
1557 && inst_saves_fr (next_inst
) >= 4
1558 && inst_saves_fr (next_inst
) <= (TARGET_PTR_BIT
== 64 ? 11 : 7))
1560 /* So we drop into the code below in a reasonable state. */
1561 reg_num
= inst_saves_fr (next_inst
);
1565 /* Ugh. Also account for argument stores into the stack.
1566 This is a kludge as on the HP compiler sets this bit and it
1567 never does prologue scheduling. So once we see one, skip past
1569 if (reg_num
>= 4 && reg_num
<= (TARGET_PTR_BIT
== 64 ? 11 : 7))
1571 while (reg_num
>= 4 && reg_num
<= (TARGET_PTR_BIT
== 64 ? 11 : 7))
1574 status
= deprecated_read_memory_nobpt (pc
, buf
, 4);
1575 inst
= extract_unsigned_integer (buf
, 4);
1578 if ((inst
& 0xfc000000) != 0x34000000)
1580 status
= deprecated_read_memory_nobpt (pc
+ 4, buf
, 4);
1581 next_inst
= extract_unsigned_integer (buf
, 4);
1584 reg_num
= inst_saves_fr (next_inst
);
1590 /* Quit if we hit any kind of branch. This can happen if a prologue
1591 instruction is in the delay slot of the first call/branch. */
1592 if (is_branch (inst
) && stop_before_branch
)
1595 /* What a crock. The HP compilers set args_stored even if no
1596 arguments were stored into the stack (boo hiss). This could
1597 cause this code to then skip a bunch of user insns (up to the
1600 To combat this we try to identify when args_stored was bogusly
1601 set and clear it. We only do this when args_stored is nonzero,
1602 all other resources are accounted for, and nothing changed on
1605 && !(save_gr
|| save_fr
|| save_rp
|| save_sp
|| stack_remaining
> 0)
1606 && old_save_gr
== save_gr
&& old_save_fr
== save_fr
1607 && old_save_rp
== save_rp
&& old_save_sp
== save_sp
1608 && old_stack_remaining
== stack_remaining
)
1614 /* !stop_before_branch, so also look at the insn in the delay slot
1616 if (final_iteration
)
1618 if (is_branch (inst
))
1619 final_iteration
= 1;
1622 /* We've got a tenative location for the end of the prologue. However
1623 because of limitations in the unwind descriptor mechanism we may
1624 have went too far into user code looking for the save of a register
1625 that does not exist. So, if there registers we expected to be saved
1626 but never were, mask them out and restart.
1628 This should only happen in optimized code, and should be very rare. */
1629 if (save_gr
|| (save_fr
&& !(restart_fr
|| restart_gr
)))
1632 restart_gr
= save_gr
;
1633 restart_fr
= save_fr
;
1641 /* Return the address of the PC after the last prologue instruction if
1642 we can determine it from the debug symbols. Else return zero. */
1645 after_prologue (CORE_ADDR pc
)
1647 struct symtab_and_line sal
;
1648 CORE_ADDR func_addr
, func_end
;
1651 /* If we can not find the symbol in the partial symbol table, then
1652 there is no hope we can determine the function's start address
1654 if (!find_pc_partial_function (pc
, NULL
, &func_addr
, &func_end
))
1657 /* Get the line associated with FUNC_ADDR. */
1658 sal
= find_pc_line (func_addr
, 0);
1660 /* There are only two cases to consider. First, the end of the source line
1661 is within the function bounds. In that case we return the end of the
1662 source line. Second is the end of the source line extends beyond the
1663 bounds of the current function. We need to use the slow code to
1664 examine instructions in that case.
1666 Anything else is simply a bug elsewhere. Fixing it here is absolutely
1667 the wrong thing to do. In fact, it should be entirely possible for this
1668 function to always return zero since the slow instruction scanning code
1669 is supposed to *always* work. If it does not, then it is a bug. */
1670 if (sal
.end
< func_end
)
1676 /* To skip prologues, I use this predicate. Returns either PC itself
1677 if the code at PC does not look like a function prologue; otherwise
1678 returns an address that (if we're lucky) follows the prologue.
1680 hppa_skip_prologue is called by gdb to place a breakpoint in a function.
1681 It doesn't necessarily skips all the insns in the prologue. In fact
1682 we might not want to skip all the insns because a prologue insn may
1683 appear in the delay slot of the first branch, and we don't want to
1684 skip over the branch in that case. */
1687 hppa_skip_prologue (CORE_ADDR pc
)
1691 CORE_ADDR post_prologue_pc
;
1694 /* See if we can determine the end of the prologue via the symbol table.
1695 If so, then return either PC, or the PC after the prologue, whichever
1698 post_prologue_pc
= after_prologue (pc
);
1700 /* If after_prologue returned a useful address, then use it. Else
1701 fall back on the instruction skipping code.
1703 Some folks have claimed this causes problems because the breakpoint
1704 may be the first instruction of the prologue. If that happens, then
1705 the instruction skipping code has a bug that needs to be fixed. */
1706 if (post_prologue_pc
!= 0)
1707 return max (pc
, post_prologue_pc
);
1709 return (skip_prologue_hard_way (pc
, 1));
1712 struct hppa_frame_cache
1715 struct trad_frame_saved_reg
*saved_regs
;
1718 static struct hppa_frame_cache
*
1719 hppa_frame_cache (struct frame_info
*next_frame
, void **this_cache
)
1721 struct hppa_frame_cache
*cache
;
1726 struct unwind_table_entry
*u
;
1727 CORE_ADDR prologue_end
;
1732 fprintf_unfiltered (gdb_stdlog
, "{ hppa_frame_cache (frame=%d) -> ",
1733 frame_relative_level(next_frame
));
1735 if ((*this_cache
) != NULL
)
1738 fprintf_unfiltered (gdb_stdlog
, "base=0x%s (cached) }",
1739 paddr_nz (((struct hppa_frame_cache
*)*this_cache
)->base
));
1740 return (*this_cache
);
1742 cache
= FRAME_OBSTACK_ZALLOC (struct hppa_frame_cache
);
1743 (*this_cache
) = cache
;
1744 cache
->saved_regs
= trad_frame_alloc_saved_regs (next_frame
);
1747 u
= find_unwind_entry (frame_pc_unwind (next_frame
));
1751 fprintf_unfiltered (gdb_stdlog
, "base=NULL (no unwind entry) }");
1752 return (*this_cache
);
1755 /* Turn the Entry_GR field into a bitmask. */
1757 for (i
= 3; i
< u
->Entry_GR
+ 3; i
++)
1759 /* Frame pointer gets saved into a special location. */
1760 if (u
->Save_SP
&& i
== HPPA_FP_REGNUM
)
1763 saved_gr_mask
|= (1 << i
);
1766 /* Turn the Entry_FR field into a bitmask too. */
1768 for (i
= 12; i
< u
->Entry_FR
+ 12; i
++)
1769 saved_fr_mask
|= (1 << i
);
1771 /* Loop until we find everything of interest or hit a branch.
1773 For unoptimized GCC code and for any HP CC code this will never ever
1774 examine any user instructions.
1776 For optimized GCC code we're faced with problems. GCC will schedule
1777 its prologue and make prologue instructions available for delay slot
1778 filling. The end result is user code gets mixed in with the prologue
1779 and a prologue instruction may be in the delay slot of the first branch
1782 Some unexpected things are expected with debugging optimized code, so
1783 we allow this routine to walk past user instructions in optimized
1786 int final_iteration
= 0;
1787 CORE_ADDR pc
, end_pc
;
1788 int looking_for_sp
= u
->Save_SP
;
1789 int looking_for_rp
= u
->Save_RP
;
1792 /* We have to use skip_prologue_hard_way instead of just
1793 skip_prologue_using_sal, in case we stepped into a function without
1794 symbol information. hppa_skip_prologue also bounds the returned
1795 pc by the passed in pc, so it will not return a pc in the next
1798 We used to call hppa_skip_prologue to find the end of the prologue,
1799 but if some non-prologue instructions get scheduled into the prologue,
1800 and the program is compiled with debug information, the "easy" way
1801 in hppa_skip_prologue will return a prologue end that is too early
1802 for us to notice any potential frame adjustments. */
1804 /* We used to use frame_func_unwind () to locate the beginning of the
1805 function to pass to skip_prologue (). However, when objects are
1806 compiled without debug symbols, frame_func_unwind can return the wrong
1807 function (or 0). We can do better than that by using unwind records. */
1809 prologue_end
= skip_prologue_hard_way (u
->region_start
, 0);
1810 end_pc
= frame_pc_unwind (next_frame
);
1812 if (prologue_end
!= 0 && end_pc
> prologue_end
)
1813 end_pc
= prologue_end
;
1817 for (pc
= u
->region_start
;
1818 ((saved_gr_mask
|| saved_fr_mask
1819 || looking_for_sp
|| looking_for_rp
1820 || frame_size
< (u
->Total_frame_size
<< 3))
1828 if (!safe_frame_unwind_memory (next_frame
, pc
, buf4
,
1831 error (_("Cannot read instruction at 0x%s."), paddr_nz (pc
));
1832 return (*this_cache
);
1835 inst
= extract_unsigned_integer (buf4
, sizeof buf4
);
1837 /* Note the interesting effects of this instruction. */
1838 frame_size
+= prologue_inst_adjust_sp (inst
);
1840 /* There are limited ways to store the return pointer into the
1842 if (inst
== 0x6bc23fd9) /* stw rp,-0x14(sr0,sp) */
1845 cache
->saved_regs
[HPPA_RP_REGNUM
].addr
= -20;
1847 else if (inst
== 0x6bc23fd1) /* stw rp,-0x18(sr0,sp) */
1850 cache
->saved_regs
[HPPA_RP_REGNUM
].addr
= -24;
1852 else if (inst
== 0x0fc212c1) /* std rp,-0x10(sr0,sp) */
1855 cache
->saved_regs
[HPPA_RP_REGNUM
].addr
= -16;
1858 /* Check to see if we saved SP into the stack. This also
1859 happens to indicate the location of the saved frame
1861 if ((inst
& 0xffffc000) == 0x6fc10000 /* stw,ma r1,N(sr0,sp) */
1862 || (inst
& 0xffffc00c) == 0x73c10008) /* std,ma r1,N(sr0,sp) */
1865 cache
->saved_regs
[HPPA_FP_REGNUM
].addr
= 0;
1867 else if (inst
== 0x08030241) /* copy %r3, %r1 */
1872 /* Account for general and floating-point register saves. */
1873 reg
= inst_saves_gr (inst
);
1874 if (reg
>= 3 && reg
<= 18
1875 && (!u
->Save_SP
|| reg
!= HPPA_FP_REGNUM
))
1877 saved_gr_mask
&= ~(1 << reg
);
1878 if ((inst
>> 26) == 0x1b && hppa_extract_14 (inst
) >= 0)
1879 /* stwm with a positive displacement is a _post_
1881 cache
->saved_regs
[reg
].addr
= 0;
1882 else if ((inst
& 0xfc00000c) == 0x70000008)
1883 /* A std has explicit post_modify forms. */
1884 cache
->saved_regs
[reg
].addr
= 0;
1889 if ((inst
>> 26) == 0x1c)
1890 offset
= (inst
& 0x1 ? -1 << 13 : 0) | (((inst
>> 4) & 0x3ff) << 3);
1891 else if ((inst
>> 26) == 0x03)
1892 offset
= hppa_low_hppa_sign_extend (inst
& 0x1f, 5);
1894 offset
= hppa_extract_14 (inst
);
1896 /* Handle code with and without frame pointers. */
1898 cache
->saved_regs
[reg
].addr
= offset
;
1900 cache
->saved_regs
[reg
].addr
= (u
->Total_frame_size
<< 3) + offset
;
1904 /* GCC handles callee saved FP regs a little differently.
1906 It emits an instruction to put the value of the start of
1907 the FP store area into %r1. It then uses fstds,ma with a
1908 basereg of %r1 for the stores.
1910 HP CC emits them at the current stack pointer modifying the
1911 stack pointer as it stores each register. */
1913 /* ldo X(%r3),%r1 or ldo X(%r30),%r1. */
1914 if ((inst
& 0xffffc000) == 0x34610000
1915 || (inst
& 0xffffc000) == 0x37c10000)
1916 fp_loc
= hppa_extract_14 (inst
);
1918 reg
= inst_saves_fr (inst
);
1919 if (reg
>= 12 && reg
<= 21)
1921 /* Note +4 braindamage below is necessary because the FP
1922 status registers are internally 8 registers rather than
1923 the expected 4 registers. */
1924 saved_fr_mask
&= ~(1 << reg
);
1927 /* 1st HP CC FP register store. After this
1928 instruction we've set enough state that the GCC and
1929 HPCC code are both handled in the same manner. */
1930 cache
->saved_regs
[reg
+ HPPA_FP4_REGNUM
+ 4].addr
= 0;
1935 cache
->saved_regs
[reg
+ HPPA_FP0_REGNUM
+ 4].addr
= fp_loc
;
1940 /* Quit if we hit any kind of branch the previous iteration. */
1941 if (final_iteration
)
1943 /* We want to look precisely one instruction beyond the branch
1944 if we have not found everything yet. */
1945 if (is_branch (inst
))
1946 final_iteration
= 1;
1951 /* The frame base always represents the value of %sp at entry to
1952 the current function (and is thus equivalent to the "saved"
1954 CORE_ADDR this_sp
= frame_unwind_register_unsigned (next_frame
, HPPA_SP_REGNUM
);
1958 fprintf_unfiltered (gdb_stdlog
, " (this_sp=0x%s, pc=0x%s, "
1959 "prologue_end=0x%s) ",
1961 paddr_nz (frame_pc_unwind (next_frame
)),
1962 paddr_nz (prologue_end
));
1964 /* Check to see if a frame pointer is available, and use it for
1965 frame unwinding if it is.
1967 There are some situations where we need to rely on the frame
1968 pointer to do stack unwinding. For example, if a function calls
1969 alloca (), the stack pointer can get adjusted inside the body of
1970 the function. In this case, the ABI requires that the compiler
1971 maintain a frame pointer for the function.
1973 The unwind record has a flag (alloca_frame) that indicates that
1974 a function has a variable frame; unfortunately, gcc/binutils
1975 does not set this flag. Instead, whenever a frame pointer is used
1976 and saved on the stack, the Save_SP flag is set. We use this to
1977 decide whether to use the frame pointer for unwinding.
1979 TODO: For the HP compiler, maybe we should use the alloca_frame flag
1980 instead of Save_SP. */
1982 fp
= frame_unwind_register_unsigned (next_frame
, HPPA_FP_REGNUM
);
1984 if (frame_pc_unwind (next_frame
) >= prologue_end
1985 && u
->Save_SP
&& fp
!= 0)
1990 fprintf_unfiltered (gdb_stdlog
, " (base=0x%s) [frame pointer] }",
1991 paddr_nz (cache
->base
));
1994 && trad_frame_addr_p (cache
->saved_regs
, HPPA_SP_REGNUM
))
1996 /* Both we're expecting the SP to be saved and the SP has been
1997 saved. The entry SP value is saved at this frame's SP
1999 cache
->base
= read_memory_integer (this_sp
, TARGET_PTR_BIT
/ 8);
2002 fprintf_unfiltered (gdb_stdlog
, " (base=0x%s) [saved] }",
2003 paddr_nz (cache
->base
));
2007 /* The prologue has been slowly allocating stack space. Adjust
2009 cache
->base
= this_sp
- frame_size
;
2011 fprintf_unfiltered (gdb_stdlog
, " (base=0x%s) [unwind adjust] } ",
2012 paddr_nz (cache
->base
));
2015 trad_frame_set_value (cache
->saved_regs
, HPPA_SP_REGNUM
, cache
->base
);
2018 /* The PC is found in the "return register", "Millicode" uses "r31"
2019 as the return register while normal code uses "rp". */
2022 if (trad_frame_addr_p (cache
->saved_regs
, 31))
2023 cache
->saved_regs
[HPPA_PCOQ_HEAD_REGNUM
] = cache
->saved_regs
[31];
2026 ULONGEST r31
= frame_unwind_register_unsigned (next_frame
, 31);
2027 trad_frame_set_value (cache
->saved_regs
, HPPA_PCOQ_HEAD_REGNUM
, r31
);
2032 if (trad_frame_addr_p (cache
->saved_regs
, HPPA_RP_REGNUM
))
2033 cache
->saved_regs
[HPPA_PCOQ_HEAD_REGNUM
] = cache
->saved_regs
[HPPA_RP_REGNUM
];
2036 ULONGEST rp
= frame_unwind_register_unsigned (next_frame
, HPPA_RP_REGNUM
);
2037 trad_frame_set_value (cache
->saved_regs
, HPPA_PCOQ_HEAD_REGNUM
, rp
);
2041 /* If Save_SP is set, then we expect the frame pointer to be saved in the
2042 frame. However, there is a one-insn window where we haven't saved it
2043 yet, but we've already clobbered it. Detect this case and fix it up.
2045 The prologue sequence for frame-pointer functions is:
2046 0: stw %rp, -20(%sp)
2049 c: stw,ma %r1, XX(%sp)
2051 So if we are at offset c, the r3 value that we want is not yet saved
2052 on the stack, but it's been overwritten. The prologue analyzer will
2053 set fp_in_r1 when it sees the copy insn so we know to get the value
2055 if (u
->Save_SP
&& !trad_frame_addr_p (cache
->saved_regs
, HPPA_FP_REGNUM
)
2058 ULONGEST r1
= frame_unwind_register_unsigned (next_frame
, 1);
2059 trad_frame_set_value (cache
->saved_regs
, HPPA_FP_REGNUM
, r1
);
2063 /* Convert all the offsets into addresses. */
2065 for (reg
= 0; reg
< NUM_REGS
; reg
++)
2067 if (trad_frame_addr_p (cache
->saved_regs
, reg
))
2068 cache
->saved_regs
[reg
].addr
+= cache
->base
;
2073 struct gdbarch
*gdbarch
;
2074 struct gdbarch_tdep
*tdep
;
2076 gdbarch
= get_frame_arch (next_frame
);
2077 tdep
= gdbarch_tdep (gdbarch
);
2079 if (tdep
->unwind_adjust_stub
)
2081 tdep
->unwind_adjust_stub (next_frame
, cache
->base
, cache
->saved_regs
);
2086 fprintf_unfiltered (gdb_stdlog
, "base=0x%s }",
2087 paddr_nz (((struct hppa_frame_cache
*)*this_cache
)->base
));
2088 return (*this_cache
);
2092 hppa_frame_this_id (struct frame_info
*next_frame
, void **this_cache
,
2093 struct frame_id
*this_id
)
2095 struct hppa_frame_cache
*info
;
2096 CORE_ADDR pc
= frame_pc_unwind (next_frame
);
2097 struct unwind_table_entry
*u
;
2099 info
= hppa_frame_cache (next_frame
, this_cache
);
2100 u
= find_unwind_entry (pc
);
2102 (*this_id
) = frame_id_build (info
->base
, u
->region_start
);
2106 hppa_frame_prev_register (struct frame_info
*next_frame
,
2108 int regnum
, int *optimizedp
,
2109 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
2110 int *realnump
, gdb_byte
*valuep
)
2112 struct hppa_frame_cache
*info
= hppa_frame_cache (next_frame
, this_cache
);
2113 hppa_frame_prev_register_helper (next_frame
, info
->saved_regs
, regnum
,
2114 optimizedp
, lvalp
, addrp
, realnump
, valuep
);
2117 static const struct frame_unwind hppa_frame_unwind
=
2121 hppa_frame_prev_register
2124 static const struct frame_unwind
*
2125 hppa_frame_unwind_sniffer (struct frame_info
*next_frame
)
2127 CORE_ADDR pc
= frame_pc_unwind (next_frame
);
2129 if (find_unwind_entry (pc
))
2130 return &hppa_frame_unwind
;
2135 /* This is a generic fallback frame unwinder that kicks in if we fail all
2136 the other ones. Normally we would expect the stub and regular unwinder
2137 to work, but in some cases we might hit a function that just doesn't
2138 have any unwind information available. In this case we try to do
2139 unwinding solely based on code reading. This is obviously going to be
2140 slow, so only use this as a last resort. Currently this will only
2141 identify the stack and pc for the frame. */
2143 static struct hppa_frame_cache
*
2144 hppa_fallback_frame_cache (struct frame_info
*next_frame
, void **this_cache
)
2146 struct hppa_frame_cache
*cache
;
2147 unsigned int frame_size
= 0;
2152 fprintf_unfiltered (gdb_stdlog
,
2153 "{ hppa_fallback_frame_cache (frame=%d) -> ",
2154 frame_relative_level (next_frame
));
2156 cache
= FRAME_OBSTACK_ZALLOC (struct hppa_frame_cache
);
2157 (*this_cache
) = cache
;
2158 cache
->saved_regs
= trad_frame_alloc_saved_regs (next_frame
);
2160 start_pc
= frame_func_unwind (next_frame
);
2163 CORE_ADDR cur_pc
= frame_pc_unwind (next_frame
);
2166 for (pc
= start_pc
; pc
< cur_pc
; pc
+= 4)
2170 insn
= read_memory_unsigned_integer (pc
, 4);
2171 frame_size
+= prologue_inst_adjust_sp (insn
);
2173 /* There are limited ways to store the return pointer into the
2175 if (insn
== 0x6bc23fd9) /* stw rp,-0x14(sr0,sp) */
2177 cache
->saved_regs
[HPPA_RP_REGNUM
].addr
= -20;
2180 else if (insn
== 0x0fc212c1) /* std rp,-0x10(sr0,sp) */
2182 cache
->saved_regs
[HPPA_RP_REGNUM
].addr
= -16;
2189 fprintf_unfiltered (gdb_stdlog
, " frame_size=%d, found_rp=%d }\n",
2190 frame_size
, found_rp
);
2192 cache
->base
= frame_unwind_register_unsigned (next_frame
, HPPA_SP_REGNUM
);
2193 cache
->base
-= frame_size
;
2194 trad_frame_set_value (cache
->saved_regs
, HPPA_SP_REGNUM
, cache
->base
);
2196 if (trad_frame_addr_p (cache
->saved_regs
, HPPA_RP_REGNUM
))
2198 cache
->saved_regs
[HPPA_RP_REGNUM
].addr
+= cache
->base
;
2199 cache
->saved_regs
[HPPA_PCOQ_HEAD_REGNUM
] =
2200 cache
->saved_regs
[HPPA_RP_REGNUM
];
2205 rp
= frame_unwind_register_unsigned (next_frame
, HPPA_RP_REGNUM
);
2206 trad_frame_set_value (cache
->saved_regs
, HPPA_PCOQ_HEAD_REGNUM
, rp
);
2213 hppa_fallback_frame_this_id (struct frame_info
*next_frame
, void **this_cache
,
2214 struct frame_id
*this_id
)
2216 struct hppa_frame_cache
*info
=
2217 hppa_fallback_frame_cache (next_frame
, this_cache
);
2218 (*this_id
) = frame_id_build (info
->base
, frame_func_unwind (next_frame
));
2222 hppa_fallback_frame_prev_register (struct frame_info
*next_frame
,
2224 int regnum
, int *optimizedp
,
2225 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
2226 int *realnump
, gdb_byte
*valuep
)
2228 struct hppa_frame_cache
*info
=
2229 hppa_fallback_frame_cache (next_frame
, this_cache
);
2230 hppa_frame_prev_register_helper (next_frame
, info
->saved_regs
, regnum
,
2231 optimizedp
, lvalp
, addrp
, realnump
, valuep
);
2234 static const struct frame_unwind hppa_fallback_frame_unwind
=
2237 hppa_fallback_frame_this_id
,
2238 hppa_fallback_frame_prev_register
2241 static const struct frame_unwind
*
2242 hppa_fallback_unwind_sniffer (struct frame_info
*next_frame
)
2244 return &hppa_fallback_frame_unwind
;
2247 /* Stub frames, used for all kinds of call stubs. */
2248 struct hppa_stub_unwind_cache
2251 struct trad_frame_saved_reg
*saved_regs
;
2254 static struct hppa_stub_unwind_cache
*
2255 hppa_stub_frame_unwind_cache (struct frame_info
*next_frame
,
2258 struct gdbarch
*gdbarch
= get_frame_arch (next_frame
);
2259 struct hppa_stub_unwind_cache
*info
;
2260 struct unwind_table_entry
*u
;
2265 info
= FRAME_OBSTACK_ZALLOC (struct hppa_stub_unwind_cache
);
2267 info
->saved_regs
= trad_frame_alloc_saved_regs (next_frame
);
2269 info
->base
= frame_unwind_register_unsigned (next_frame
, HPPA_SP_REGNUM
);
2271 if (gdbarch_osabi (gdbarch
) == GDB_OSABI_HPUX_SOM
)
2273 /* HPUX uses export stubs in function calls; the export stub clobbers
2274 the return value of the caller, and, later restores it from the
2276 u
= find_unwind_entry (frame_pc_unwind (next_frame
));
2278 if (u
&& u
->stub_unwind
.stub_type
== EXPORT
)
2280 info
->saved_regs
[HPPA_PCOQ_HEAD_REGNUM
].addr
= info
->base
- 24;
2286 /* By default we assume that stubs do not change the rp. */
2287 info
->saved_regs
[HPPA_PCOQ_HEAD_REGNUM
].realreg
= HPPA_RP_REGNUM
;
2293 hppa_stub_frame_this_id (struct frame_info
*next_frame
,
2294 void **this_prologue_cache
,
2295 struct frame_id
*this_id
)
2297 struct hppa_stub_unwind_cache
*info
2298 = hppa_stub_frame_unwind_cache (next_frame
, this_prologue_cache
);
2301 *this_id
= frame_id_build (info
->base
, frame_func_unwind (next_frame
));
2303 *this_id
= null_frame_id
;
2307 hppa_stub_frame_prev_register (struct frame_info
*next_frame
,
2308 void **this_prologue_cache
,
2309 int regnum
, int *optimizedp
,
2310 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
2311 int *realnump
, gdb_byte
*valuep
)
2313 struct hppa_stub_unwind_cache
*info
2314 = hppa_stub_frame_unwind_cache (next_frame
, this_prologue_cache
);
2317 hppa_frame_prev_register_helper (next_frame
, info
->saved_regs
, regnum
,
2318 optimizedp
, lvalp
, addrp
, realnump
,
2321 error (_("Requesting registers from null frame."));
2324 static const struct frame_unwind hppa_stub_frame_unwind
= {
2326 hppa_stub_frame_this_id
,
2327 hppa_stub_frame_prev_register
2330 static const struct frame_unwind
*
2331 hppa_stub_unwind_sniffer (struct frame_info
*next_frame
)
2333 CORE_ADDR pc
= frame_pc_unwind (next_frame
);
2334 struct gdbarch
*gdbarch
= get_frame_arch (next_frame
);
2335 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
2338 || (tdep
->in_solib_call_trampoline
!= NULL
2339 && tdep
->in_solib_call_trampoline (pc
, NULL
))
2340 || IN_SOLIB_RETURN_TRAMPOLINE (pc
, NULL
))
2341 return &hppa_stub_frame_unwind
;
2345 static struct frame_id
2346 hppa_unwind_dummy_id (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
2348 return frame_id_build (frame_unwind_register_unsigned (next_frame
,
2350 frame_pc_unwind (next_frame
));
2354 hppa_unwind_pc (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
2359 ipsw
= frame_unwind_register_unsigned (next_frame
, HPPA_IPSW_REGNUM
);
2360 pc
= frame_unwind_register_unsigned (next_frame
, HPPA_PCOQ_HEAD_REGNUM
);
2362 /* If the current instruction is nullified, then we are effectively
2363 still executing the previous instruction. Pretend we are still
2364 there. This is needed when single stepping; if the nullified
2365 instruction is on a different line, we don't want GDB to think
2366 we've stepped onto that line. */
2367 if (ipsw
& 0x00200000)
2373 /* Return the minimal symbol whose name is NAME and stub type is STUB_TYPE.
2374 Return NULL if no such symbol was found. */
2376 struct minimal_symbol
*
2377 hppa_lookup_stub_minimal_symbol (const char *name
,
2378 enum unwind_stub_types stub_type
)
2380 struct objfile
*objfile
;
2381 struct minimal_symbol
*msym
;
2383 ALL_MSYMBOLS (objfile
, msym
)
2385 if (strcmp (SYMBOL_LINKAGE_NAME (msym
), name
) == 0)
2387 struct unwind_table_entry
*u
;
2389 u
= find_unwind_entry (SYMBOL_VALUE (msym
));
2390 if (u
!= NULL
&& u
->stub_unwind
.stub_type
== stub_type
)
2399 unwind_command (char *exp
, int from_tty
)
2402 struct unwind_table_entry
*u
;
2404 /* If we have an expression, evaluate it and use it as the address. */
2406 if (exp
!= 0 && *exp
!= 0)
2407 address
= parse_and_eval_address (exp
);
2411 u
= find_unwind_entry (address
);
2415 printf_unfiltered ("Can't find unwind table entry for %s\n", exp
);
2419 printf_unfiltered ("unwind_table_entry (0x%lx):\n", (unsigned long)u
);
2421 printf_unfiltered ("\tregion_start = ");
2422 print_address (u
->region_start
, gdb_stdout
);
2423 gdb_flush (gdb_stdout
);
2425 printf_unfiltered ("\n\tregion_end = ");
2426 print_address (u
->region_end
, gdb_stdout
);
2427 gdb_flush (gdb_stdout
);
2429 #define pif(FLD) if (u->FLD) printf_unfiltered (" "#FLD);
2431 printf_unfiltered ("\n\tflags =");
2432 pif (Cannot_unwind
);
2434 pif (Millicode_save_sr0
);
2437 pif (Variable_Frame
);
2438 pif (Separate_Package_Body
);
2439 pif (Frame_Extension_Millicode
);
2440 pif (Stack_Overflow_Check
);
2441 pif (Two_Instruction_SP_Increment
);
2445 pif (Save_MRP_in_frame
);
2446 pif (extn_ptr_defined
);
2447 pif (Cleanup_defined
);
2448 pif (MPE_XL_interrupt_marker
);
2449 pif (HP_UX_interrupt_marker
);
2452 putchar_unfiltered ('\n');
2454 #define pin(FLD) printf_unfiltered ("\t"#FLD" = 0x%x\n", u->FLD);
2456 pin (Region_description
);
2459 pin (Total_frame_size
);
2461 if (u
->stub_unwind
.stub_type
)
2463 printf_unfiltered ("\tstub type = ");
2464 switch (u
->stub_unwind
.stub_type
)
2467 printf_unfiltered ("long branch\n");
2469 case PARAMETER_RELOCATION
:
2470 printf_unfiltered ("parameter relocation\n");
2473 printf_unfiltered ("export\n");
2476 printf_unfiltered ("import\n");
2479 printf_unfiltered ("import shlib\n");
2482 printf_unfiltered ("unknown (%d)\n", u
->stub_unwind
.stub_type
);
2488 hppa_pc_requires_run_before_use (CORE_ADDR pc
)
2490 /* Sometimes we may pluck out a minimal symbol that has a negative address.
2492 An example of this occurs when an a.out is linked against a foo.sl.
2493 The foo.sl defines a global bar(), and the a.out declares a signature
2494 for bar(). However, the a.out doesn't directly call bar(), but passes
2495 its address in another call.
2497 If you have this scenario and attempt to "break bar" before running,
2498 gdb will find a minimal symbol for bar() in the a.out. But that
2499 symbol's address will be negative. What this appears to denote is
2500 an index backwards from the base of the procedure linkage table (PLT)
2501 into the data linkage table (DLT), the end of which is contiguous
2502 with the start of the PLT. This is clearly not a valid address for
2503 us to set a breakpoint on.
2505 Note that one must be careful in how one checks for a negative address.
2506 0xc0000000 is a legitimate address of something in a shared text
2507 segment, for example. Since I don't know what the possible range
2508 is of these "really, truly negative" addresses that come from the
2509 minimal symbols, I'm resorting to the gross hack of checking the
2510 top byte of the address for all 1's. Sigh. */
2512 return (!target_has_stack
&& (pc
& 0xFF000000) == 0xFF000000);
2515 /* Return the GDB type object for the "standard" data type of data in
2518 static struct type
*
2519 hppa32_register_type (struct gdbarch
*gdbarch
, int regnum
)
2521 if (regnum
< HPPA_FP4_REGNUM
)
2522 return builtin_type_uint32
;
2524 return builtin_type_ieee_single_big
;
2527 static struct type
*
2528 hppa64_register_type (struct gdbarch
*gdbarch
, int regnum
)
2530 if (regnum
< HPPA64_FP4_REGNUM
)
2531 return builtin_type_uint64
;
2533 return builtin_type_ieee_double_big
;
2536 /* Return non-zero if REGNUM is not a register available to the user
2537 through ptrace/ttrace. */
2540 hppa32_cannot_store_register (int regnum
)
2543 || regnum
== HPPA_PCSQ_HEAD_REGNUM
2544 || (regnum
>= HPPA_PCSQ_TAIL_REGNUM
&& regnum
< HPPA_IPSW_REGNUM
)
2545 || (regnum
> HPPA_IPSW_REGNUM
&& regnum
< HPPA_FP4_REGNUM
));
2549 hppa64_cannot_store_register (int regnum
)
2552 || regnum
== HPPA_PCSQ_HEAD_REGNUM
2553 || (regnum
>= HPPA_PCSQ_TAIL_REGNUM
&& regnum
< HPPA_IPSW_REGNUM
)
2554 || (regnum
> HPPA_IPSW_REGNUM
&& regnum
< HPPA64_FP4_REGNUM
));
2558 hppa_smash_text_address (CORE_ADDR addr
)
2560 /* The low two bits of the PC on the PA contain the privilege level.
2561 Some genius implementing a (non-GCC) compiler apparently decided
2562 this means that "addresses" in a text section therefore include a
2563 privilege level, and thus symbol tables should contain these bits.
2564 This seems like a bonehead thing to do--anyway, it seems to work
2565 for our purposes to just ignore those bits. */
2567 return (addr
&= ~0x3);
2570 /* Get the ARGIth function argument for the current function. */
2573 hppa_fetch_pointer_argument (struct frame_info
*frame
, int argi
,
2576 return get_frame_register_unsigned (frame
, HPPA_R0_REGNUM
+ 26 - argi
);
2580 hppa_pseudo_register_read (struct gdbarch
*gdbarch
, struct regcache
*regcache
,
2581 int regnum
, gdb_byte
*buf
)
2585 regcache_raw_read_unsigned (regcache
, regnum
, &tmp
);
2586 if (regnum
== HPPA_PCOQ_HEAD_REGNUM
|| regnum
== HPPA_PCOQ_TAIL_REGNUM
)
2588 store_unsigned_integer (buf
, sizeof tmp
, tmp
);
2592 hppa_find_global_pointer (struct value
*function
)
2598 hppa_frame_prev_register_helper (struct frame_info
*next_frame
,
2599 struct trad_frame_saved_reg saved_regs
[],
2600 int regnum
, int *optimizedp
,
2601 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
2602 int *realnump
, void *valuep
)
2604 struct gdbarch
*arch
= get_frame_arch (next_frame
);
2606 if (regnum
== HPPA_PCOQ_TAIL_REGNUM
)
2610 int size
= register_size (arch
, HPPA_PCOQ_HEAD_REGNUM
);
2613 trad_frame_get_prev_register (next_frame
, saved_regs
,
2614 HPPA_PCOQ_HEAD_REGNUM
, optimizedp
,
2615 lvalp
, addrp
, realnump
, valuep
);
2617 pc
= extract_unsigned_integer (valuep
, size
);
2618 store_unsigned_integer (valuep
, size
, pc
+ 4);
2621 /* It's a computed value. */
2629 /* Make sure the "flags" register is zero in all unwound frames.
2630 The "flags" registers is a HP-UX specific wart, and only the code
2631 in hppa-hpux-tdep.c depends on it. However, it is easier to deal
2632 with it here. This shouldn't affect other systems since those
2633 should provide zero for the "flags" register anyway. */
2634 if (regnum
== HPPA_FLAGS_REGNUM
)
2637 store_unsigned_integer (valuep
, register_size (arch
, regnum
), 0);
2639 /* It's a computed value. */
2647 trad_frame_get_prev_register (next_frame
, saved_regs
, regnum
,
2648 optimizedp
, lvalp
, addrp
, realnump
, valuep
);
2652 /* Here is a table of C type sizes on hppa with various compiles
2653 and options. I measured this on PA 9000/800 with HP-UX 11.11
2654 and these compilers:
2656 /usr/ccs/bin/cc HP92453-01 A.11.01.21
2657 /opt/ansic/bin/cc HP92453-01 B.11.11.28706.GP
2658 /opt/aCC/bin/aCC B3910B A.03.45
2659 gcc gcc 3.3.2 native hppa2.0w-hp-hpux11.11
2661 cc : 1 2 4 4 8 : 4 8 -- : 4 4
2662 ansic +DA1.1 : 1 2 4 4 8 : 4 8 16 : 4 4
2663 ansic +DA2.0 : 1 2 4 4 8 : 4 8 16 : 4 4
2664 ansic +DA2.0W : 1 2 4 8 8 : 4 8 16 : 8 8
2665 acc +DA1.1 : 1 2 4 4 8 : 4 8 16 : 4 4
2666 acc +DA2.0 : 1 2 4 4 8 : 4 8 16 : 4 4
2667 acc +DA2.0W : 1 2 4 8 8 : 4 8 16 : 8 8
2668 gcc : 1 2 4 4 8 : 4 8 16 : 4 4
2672 compiler and options
2673 char, short, int, long, long long
2674 float, double, long double
2677 So all these compilers use either ILP32 or LP64 model.
2678 TODO: gcc has more options so it needs more investigation.
2680 For floating point types, see:
2682 http://docs.hp.com/hpux/pdf/B3906-90006.pdf
2683 HP-UX floating-point guide, hpux 11.00
2685 -- chastain 2003-12-18 */
2687 static struct gdbarch
*
2688 hppa_gdbarch_init (struct gdbarch_info info
, struct gdbarch_list
*arches
)
2690 struct gdbarch_tdep
*tdep
;
2691 struct gdbarch
*gdbarch
;
2693 /* Try to determine the ABI of the object we are loading. */
2694 if (info
.abfd
!= NULL
&& info
.osabi
== GDB_OSABI_UNKNOWN
)
2696 /* If it's a SOM file, assume it's HP/UX SOM. */
2697 if (bfd_get_flavour (info
.abfd
) == bfd_target_som_flavour
)
2698 info
.osabi
= GDB_OSABI_HPUX_SOM
;
2701 /* find a candidate among the list of pre-declared architectures. */
2702 arches
= gdbarch_list_lookup_by_info (arches
, &info
);
2704 return (arches
->gdbarch
);
2706 /* If none found, then allocate and initialize one. */
2707 tdep
= XZALLOC (struct gdbarch_tdep
);
2708 gdbarch
= gdbarch_alloc (&info
, tdep
);
2710 /* Determine from the bfd_arch_info structure if we are dealing with
2711 a 32 or 64 bits architecture. If the bfd_arch_info is not available,
2712 then default to a 32bit machine. */
2713 if (info
.bfd_arch_info
!= NULL
)
2714 tdep
->bytes_per_address
=
2715 info
.bfd_arch_info
->bits_per_address
/ info
.bfd_arch_info
->bits_per_byte
;
2717 tdep
->bytes_per_address
= 4;
2719 tdep
->find_global_pointer
= hppa_find_global_pointer
;
2721 /* Some parts of the gdbarch vector depend on whether we are running
2722 on a 32 bits or 64 bits target. */
2723 switch (tdep
->bytes_per_address
)
2726 set_gdbarch_num_regs (gdbarch
, hppa32_num_regs
);
2727 set_gdbarch_register_name (gdbarch
, hppa32_register_name
);
2728 set_gdbarch_register_type (gdbarch
, hppa32_register_type
);
2729 set_gdbarch_cannot_store_register (gdbarch
,
2730 hppa32_cannot_store_register
);
2731 set_gdbarch_cannot_fetch_register (gdbarch
,
2732 hppa32_cannot_store_register
);
2735 set_gdbarch_num_regs (gdbarch
, hppa64_num_regs
);
2736 set_gdbarch_register_name (gdbarch
, hppa64_register_name
);
2737 set_gdbarch_register_type (gdbarch
, hppa64_register_type
);
2738 set_gdbarch_cannot_store_register (gdbarch
,
2739 hppa64_cannot_store_register
);
2740 set_gdbarch_cannot_fetch_register (gdbarch
,
2741 hppa64_cannot_store_register
);
2744 internal_error (__FILE__
, __LINE__
, _("Unsupported address size: %d"),
2745 tdep
->bytes_per_address
);
2748 set_gdbarch_long_bit (gdbarch
, tdep
->bytes_per_address
* TARGET_CHAR_BIT
);
2749 set_gdbarch_ptr_bit (gdbarch
, tdep
->bytes_per_address
* TARGET_CHAR_BIT
);
2751 /* The following gdbarch vector elements are the same in both ILP32
2752 and LP64, but might show differences some day. */
2753 set_gdbarch_long_long_bit (gdbarch
, 64);
2754 set_gdbarch_long_double_bit (gdbarch
, 128);
2755 set_gdbarch_long_double_format (gdbarch
, &floatformat_ia64_quad_big
);
2757 /* The following gdbarch vector elements do not depend on the address
2758 size, or in any other gdbarch element previously set. */
2759 set_gdbarch_skip_prologue (gdbarch
, hppa_skip_prologue
);
2760 set_gdbarch_in_function_epilogue_p (gdbarch
,
2761 hppa_in_function_epilogue_p
);
2762 set_gdbarch_inner_than (gdbarch
, core_addr_greaterthan
);
2763 set_gdbarch_sp_regnum (gdbarch
, HPPA_SP_REGNUM
);
2764 set_gdbarch_fp0_regnum (gdbarch
, HPPA_FP0_REGNUM
);
2765 set_gdbarch_addr_bits_remove (gdbarch
, hppa_smash_text_address
);
2766 set_gdbarch_smash_text_address (gdbarch
, hppa_smash_text_address
);
2767 set_gdbarch_believe_pcc_promotion (gdbarch
, 1);
2768 set_gdbarch_read_pc (gdbarch
, hppa_read_pc
);
2769 set_gdbarch_write_pc (gdbarch
, hppa_write_pc
);
2771 /* Helper for function argument information. */
2772 set_gdbarch_fetch_pointer_argument (gdbarch
, hppa_fetch_pointer_argument
);
2774 set_gdbarch_print_insn (gdbarch
, print_insn_hppa
);
2776 /* When a hardware watchpoint triggers, we'll move the inferior past
2777 it by removing all eventpoints; stepping past the instruction
2778 that caused the trigger; reinserting eventpoints; and checking
2779 whether any watched location changed. */
2780 set_gdbarch_have_nonsteppable_watchpoint (gdbarch
, 1);
2782 /* Inferior function call methods. */
2783 switch (tdep
->bytes_per_address
)
2786 set_gdbarch_push_dummy_call (gdbarch
, hppa32_push_dummy_call
);
2787 set_gdbarch_frame_align (gdbarch
, hppa32_frame_align
);
2788 set_gdbarch_convert_from_func_ptr_addr
2789 (gdbarch
, hppa32_convert_from_func_ptr_addr
);
2792 set_gdbarch_push_dummy_call (gdbarch
, hppa64_push_dummy_call
);
2793 set_gdbarch_frame_align (gdbarch
, hppa64_frame_align
);
2796 internal_error (__FILE__
, __LINE__
, _("bad switch"));
2799 /* Struct return methods. */
2800 switch (tdep
->bytes_per_address
)
2803 set_gdbarch_return_value (gdbarch
, hppa32_return_value
);
2806 set_gdbarch_return_value (gdbarch
, hppa64_return_value
);
2809 internal_error (__FILE__
, __LINE__
, _("bad switch"));
2812 set_gdbarch_breakpoint_from_pc (gdbarch
, hppa_breakpoint_from_pc
);
2813 set_gdbarch_pseudo_register_read (gdbarch
, hppa_pseudo_register_read
);
2815 /* Frame unwind methods. */
2816 set_gdbarch_unwind_dummy_id (gdbarch
, hppa_unwind_dummy_id
);
2817 set_gdbarch_unwind_pc (gdbarch
, hppa_unwind_pc
);
2819 /* Hook in ABI-specific overrides, if they have been registered. */
2820 gdbarch_init_osabi (info
, gdbarch
);
2822 /* Hook in the default unwinders. */
2823 frame_unwind_append_sniffer (gdbarch
, hppa_stub_unwind_sniffer
);
2824 frame_unwind_append_sniffer (gdbarch
, hppa_frame_unwind_sniffer
);
2825 frame_unwind_append_sniffer (gdbarch
, hppa_fallback_unwind_sniffer
);
2831 hppa_dump_tdep (struct gdbarch
*current_gdbarch
, struct ui_file
*file
)
2833 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
2835 fprintf_unfiltered (file
, "bytes_per_address = %d\n",
2836 tdep
->bytes_per_address
);
2837 fprintf_unfiltered (file
, "elf = %s\n", tdep
->is_elf
? "yes" : "no");
2841 _initialize_hppa_tdep (void)
2843 struct cmd_list_element
*c
;
2845 gdbarch_register (bfd_arch_hppa
, hppa_gdbarch_init
, hppa_dump_tdep
);
2847 hppa_objfile_priv_data
= register_objfile_data ();
2849 add_cmd ("unwind", class_maintenance
, unwind_command
,
2850 _("Print unwind table entry at given address."),
2851 &maintenanceprintlist
);
2853 /* Debug this files internals. */
2854 add_setshow_boolean_cmd ("hppa", class_maintenance
, &hppa_debug
, _("\
2855 Set whether hppa target specific debugging information should be displayed."),
2857 Show whether hppa target specific debugging information is displayed."), _("\
2858 This flag controls whether hppa target specific debugging information is\n\
2859 displayed. This information is particularly useful for debugging frame\n\
2860 unwinding problems."),
2862 NULL
, /* FIXME: i18n: hppa debug flag is %s. */
2863 &setdebuglist
, &showdebuglist
);