1 /* Target-dependent code for HP-UX on PA-RISC.
3 Copyright (C) 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "arch-utils.h"
25 #include "frame-unwind.h"
26 #include "trad-frame.h"
32 #include "hppa-tdep.h"
33 #include "solib-som.h"
34 #include "solib-pa64.h"
37 #include "exceptions.h"
39 #include "gdb_string.h"
41 #define IS_32BIT_TARGET(_gdbarch) \
42 ((gdbarch_tdep (_gdbarch))->bytes_per_address == 4)
44 /* Bit in the `ss_flag' member of `struct save_state' that indicates
45 that the 64-bit register values are live. From
46 <machine/save_state.h>. */
47 #define HPPA_HPUX_SS_WIDEREGS 0x40
49 /* Offsets of various parts of `struct save_state'. From
50 <machine/save_state.h>. */
51 #define HPPA_HPUX_SS_FLAGS_OFFSET 0
52 #define HPPA_HPUX_SS_NARROW_OFFSET 4
53 #define HPPA_HPUX_SS_FPBLOCK_OFFSET 256
54 #define HPPA_HPUX_SS_WIDE_OFFSET 640
56 /* The size of `struct save_state. */
57 #define HPPA_HPUX_SAVE_STATE_SIZE 1152
59 /* The size of `struct pa89_save_state', which corresponds to PA-RISC
60 1.1, the lowest common denominator that we support. */
61 #define HPPA_HPUX_PA89_SAVE_STATE_SIZE 512
64 /* Forward declarations. */
65 extern void _initialize_hppa_hpux_tdep (void);
66 extern initialize_file_ftype _initialize_hppa_hpux_tdep;
69 in_opd_section (CORE_ADDR pc)
71 struct obj_section *s;
74 s = find_pc_section (pc);
77 && s->the_bfd_section->name != NULL
78 && strcmp (s->the_bfd_section->name, ".opd") == 0);
82 /* Return one if PC is in the call path of a trampoline, else return zero.
84 Note we return one for *any* call trampoline (long-call, arg-reloc), not
85 just shared library trampolines (import, export). */
88 hppa32_hpux_in_solib_call_trampoline (CORE_ADDR pc, char *name)
90 struct minimal_symbol *minsym;
91 struct unwind_table_entry *u;
93 /* First see if PC is in one of the two C-library trampolines. */
94 if (pc == hppa_symbol_address("$$dyncall")
95 || pc == hppa_symbol_address("_sr4export"))
98 minsym = lookup_minimal_symbol_by_pc (pc);
99 if (minsym && strcmp (DEPRECATED_SYMBOL_NAME (minsym), ".stub") == 0)
102 /* Get the unwind descriptor corresponding to PC, return zero
103 if no unwind was found. */
104 u = find_unwind_entry (pc);
108 /* If this isn't a linker stub, then return now. */
109 if (u->stub_unwind.stub_type == 0)
112 /* By definition a long-branch stub is a call stub. */
113 if (u->stub_unwind.stub_type == LONG_BRANCH)
116 /* The call and return path execute the same instructions within
117 an IMPORT stub! So an IMPORT stub is both a call and return
119 if (u->stub_unwind.stub_type == IMPORT)
122 /* Parameter relocation stubs always have a call path and may have a
124 if (u->stub_unwind.stub_type == PARAMETER_RELOCATION
125 || u->stub_unwind.stub_type == EXPORT)
129 /* Search forward from the current PC until we hit a branch
130 or the end of the stub. */
131 for (addr = pc; addr <= u->region_end; addr += 4)
135 insn = read_memory_integer (addr, 4);
137 /* Does it look like a bl? If so then it's the call path, if
138 we find a bv or be first, then we're on the return path. */
139 if ((insn & 0xfc00e000) == 0xe8000000)
141 else if ((insn & 0xfc00e001) == 0xe800c000
142 || (insn & 0xfc000000) == 0xe0000000)
146 /* Should never happen. */
147 warning (_("Unable to find branch in parameter relocation stub."));
151 /* Unknown stub type. For now, just return zero. */
156 hppa64_hpux_in_solib_call_trampoline (CORE_ADDR pc, char *name)
158 /* PA64 has a completely different stub/trampoline scheme. Is it
159 better? Maybe. It's certainly harder to determine with any
160 certainty that we are in a stub because we can not refer to the
163 The heuristic is simple. Try to lookup the current PC value in th
164 minimal symbol table. If that fails, then assume we are not in a
167 Then see if the PC value falls within the section bounds for the
168 section containing the minimal symbol we found in the first
169 step. If it does, then assume we are not in a stub and return.
171 Finally peek at the instructions to see if they look like a stub. */
172 struct minimal_symbol *minsym;
177 minsym = lookup_minimal_symbol_by_pc (pc);
181 sec = SYMBOL_BFD_SECTION (minsym);
183 if (bfd_get_section_vma (sec->owner, sec) <= pc
184 && pc < (bfd_get_section_vma (sec->owner, sec)
185 + bfd_section_size (sec->owner, sec)))
188 /* We might be in a stub. Peek at the instructions. Stubs are 3
189 instructions long. */
190 insn = read_memory_integer (pc, 4);
192 /* Find out where we think we are within the stub. */
193 if ((insn & 0xffffc00e) == 0x53610000)
195 else if ((insn & 0xffffffff) == 0xe820d000)
197 else if ((insn & 0xffffc00e) == 0x537b0000)
202 /* Now verify each insn in the range looks like a stub instruction. */
203 insn = read_memory_integer (addr, 4);
204 if ((insn & 0xffffc00e) != 0x53610000)
207 /* Now verify each insn in the range looks like a stub instruction. */
208 insn = read_memory_integer (addr + 4, 4);
209 if ((insn & 0xffffffff) != 0xe820d000)
212 /* Now verify each insn in the range looks like a stub instruction. */
213 insn = read_memory_integer (addr + 8, 4);
214 if ((insn & 0xffffc00e) != 0x537b0000)
217 /* Looks like a stub. */
221 /* Return one if PC is in the return path of a trampoline, else return zero.
223 Note we return one for *any* call trampoline (long-call, arg-reloc), not
224 just shared library trampolines (import, export). */
227 hppa_hpux_in_solib_return_trampoline (CORE_ADDR pc, char *name)
229 struct unwind_table_entry *u;
231 /* Get the unwind descriptor corresponding to PC, return zero
232 if no unwind was found. */
233 u = find_unwind_entry (pc);
237 /* If this isn't a linker stub or it's just a long branch stub, then
239 if (u->stub_unwind.stub_type == 0 || u->stub_unwind.stub_type == LONG_BRANCH)
242 /* The call and return path execute the same instructions within
243 an IMPORT stub! So an IMPORT stub is both a call and return
245 if (u->stub_unwind.stub_type == IMPORT)
248 /* Parameter relocation stubs always have a call path and may have a
250 if (u->stub_unwind.stub_type == PARAMETER_RELOCATION
251 || u->stub_unwind.stub_type == EXPORT)
255 /* Search forward from the current PC until we hit a branch
256 or the end of the stub. */
257 for (addr = pc; addr <= u->region_end; addr += 4)
261 insn = read_memory_integer (addr, 4);
263 /* Does it look like a bl? If so then it's the call path, if
264 we find a bv or be first, then we're on the return path. */
265 if ((insn & 0xfc00e000) == 0xe8000000)
267 else if ((insn & 0xfc00e001) == 0xe800c000
268 || (insn & 0xfc000000) == 0xe0000000)
272 /* Should never happen. */
273 warning (_("Unable to find branch in parameter relocation stub."));
277 /* Unknown stub type. For now, just return zero. */
282 /* Figure out if PC is in a trampoline, and if so find out where
283 the trampoline will jump to. If not in a trampoline, return zero.
285 Simple code examination probably is not a good idea since the code
286 sequences in trampolines can also appear in user code.
288 We use unwinds and information from the minimal symbol table to
289 determine when we're in a trampoline. This won't work for ELF
290 (yet) since it doesn't create stub unwind entries. Whether or
291 not ELF will create stub unwinds or normal unwinds for linker
292 stubs is still being debated.
294 This should handle simple calls through dyncall or sr4export,
295 long calls, argument relocation stubs, and dyncall/sr4export
296 calling an argument relocation stub. It even handles some stubs
297 used in dynamic executables. */
300 hppa_hpux_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
302 struct gdbarch *gdbarch = get_frame_arch (frame);
304 long prev_inst, curr_inst, loc;
305 struct minimal_symbol *msym;
306 struct unwind_table_entry *u;
308 /* Addresses passed to dyncall may *NOT* be the actual address
309 of the function. So we may have to do something special. */
310 if (pc == hppa_symbol_address("$$dyncall"))
312 pc = (CORE_ADDR) get_frame_register_unsigned (frame, 22);
314 /* If bit 30 (counting from the left) is on, then pc is the address of
315 the PLT entry for this function, not the address of the function
316 itself. Bit 31 has meaning too, but only for MPE. */
318 pc = (CORE_ADDR) read_memory_integer
319 (pc & ~0x3, gdbarch_ptr_bit (gdbarch) / 8);
321 if (pc == hppa_symbol_address("$$dyncall_external"))
323 pc = (CORE_ADDR) get_frame_register_unsigned (frame, 22);
324 pc = (CORE_ADDR) read_memory_integer
325 (pc & ~0x3, gdbarch_ptr_bit (gdbarch) / 8);
327 else if (pc == hppa_symbol_address("_sr4export"))
328 pc = (CORE_ADDR) get_frame_register_unsigned (frame, 22);
330 /* Get the unwind descriptor corresponding to PC, return zero
331 if no unwind was found. */
332 u = find_unwind_entry (pc);
336 /* If this isn't a linker stub, then return now. */
337 /* elz: attention here! (FIXME) because of a compiler/linker
338 error, some stubs which should have a non zero stub_unwind.stub_type
339 have unfortunately a value of zero. So this function would return here
340 as if we were not in a trampoline. To fix this, we go look at the partial
341 symbol information, which reports this guy as a stub.
342 (FIXME): Unfortunately, we are not that lucky: it turns out that the
343 partial symbol information is also wrong sometimes. This is because
344 when it is entered (somread.c::som_symtab_read()) it can happen that
345 if the type of the symbol (from the som) is Entry, and the symbol is
346 in a shared library, then it can also be a trampoline. This would
347 be OK, except that I believe the way they decide if we are ina shared library
348 does not work. SOOOO..., even if we have a regular function w/o trampolines
349 its minimal symbol can be assigned type mst_solib_trampoline.
350 Also, if we find that the symbol is a real stub, then we fix the unwind
351 descriptor, and define the stub type to be EXPORT.
352 Hopefully this is correct most of the times. */
353 if (u->stub_unwind.stub_type == 0)
356 /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed
357 we can delete all the code which appears between the lines */
358 /*--------------------------------------------------------------------------*/
359 msym = lookup_minimal_symbol_by_pc (pc);
361 if (msym == NULL || MSYMBOL_TYPE (msym) != mst_solib_trampoline)
362 return orig_pc == pc ? 0 : pc & ~0x3;
364 else if (msym != NULL && MSYMBOL_TYPE (msym) == mst_solib_trampoline)
366 struct objfile *objfile;
367 struct minimal_symbol *msymbol;
368 int function_found = 0;
370 /* go look if there is another minimal symbol with the same name as
371 this one, but with type mst_text. This would happen if the msym
372 is an actual trampoline, in which case there would be another
373 symbol with the same name corresponding to the real function */
375 ALL_MSYMBOLS (objfile, msymbol)
377 if (MSYMBOL_TYPE (msymbol) == mst_text
378 && DEPRECATED_STREQ (DEPRECATED_SYMBOL_NAME (msymbol), DEPRECATED_SYMBOL_NAME (msym)))
386 /* the type of msym is correct (mst_solib_trampoline), but
387 the unwind info is wrong, so set it to the correct value */
388 u->stub_unwind.stub_type = EXPORT;
390 /* the stub type info in the unwind is correct (this is not a
391 trampoline), but the msym type information is wrong, it
392 should be mst_text. So we need to fix the msym, and also
393 get out of this function */
395 MSYMBOL_TYPE (msym) = mst_text;
396 return orig_pc == pc ? 0 : pc & ~0x3;
400 /*--------------------------------------------------------------------------*/
403 /* It's a stub. Search for a branch and figure out where it goes.
404 Note we have to handle multi insn branch sequences like ldil;ble.
405 Most (all?) other branches can be determined by examining the contents
406 of certain registers and the stack. */
413 /* Make sure we haven't walked outside the range of this stub. */
414 if (u != find_unwind_entry (loc))
416 warning (_("Unable to find branch in linker stub"));
417 return orig_pc == pc ? 0 : pc & ~0x3;
420 prev_inst = curr_inst;
421 curr_inst = read_memory_integer (loc, 4);
423 /* Does it look like a branch external using %r1? Then it's the
424 branch from the stub to the actual function. */
425 if ((curr_inst & 0xffe0e000) == 0xe0202000)
427 /* Yup. See if the previous instruction loaded
428 a value into %r1. If so compute and return the jump address. */
429 if ((prev_inst & 0xffe00000) == 0x20200000)
430 return (hppa_extract_21 (prev_inst) + hppa_extract_17 (curr_inst)) & ~0x3;
433 warning (_("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1)."));
434 return orig_pc == pc ? 0 : pc & ~0x3;
438 /* Does it look like a be 0(sr0,%r21)? OR
439 Does it look like a be, n 0(sr0,%r21)? OR
440 Does it look like a bve (r21)? (this is on PA2.0)
441 Does it look like a bve, n(r21)? (this is also on PA2.0)
442 That's the branch from an
443 import stub to an export stub.
445 It is impossible to determine the target of the branch via
446 simple examination of instructions and/or data (consider
447 that the address in the plabel may be the address of the
448 bind-on-reference routine in the dynamic loader).
450 So we have try an alternative approach.
452 Get the name of the symbol at our current location; it should
453 be a stub symbol with the same name as the symbol in the
456 Then lookup a minimal symbol with the same name; we should
457 get the minimal symbol for the target routine in the shared
458 library as those take precedence of import/export stubs. */
459 if ((curr_inst == 0xe2a00000) ||
460 (curr_inst == 0xe2a00002) ||
461 (curr_inst == 0xeaa0d000) ||
462 (curr_inst == 0xeaa0d002))
464 struct minimal_symbol *stubsym, *libsym;
466 stubsym = lookup_minimal_symbol_by_pc (loc);
469 warning (_("Unable to find symbol for 0x%lx"), loc);
470 return orig_pc == pc ? 0 : pc & ~0x3;
473 libsym = lookup_minimal_symbol (DEPRECATED_SYMBOL_NAME (stubsym), NULL, NULL);
476 warning (_("Unable to find library symbol for %s."),
477 DEPRECATED_SYMBOL_NAME (stubsym));
478 return orig_pc == pc ? 0 : pc & ~0x3;
481 return SYMBOL_VALUE (libsym);
484 /* Does it look like bl X,%rp or bl X,%r0? Another way to do a
485 branch from the stub to the actual function. */
487 else if ((curr_inst & 0xffe0e000) == 0xe8400000
488 || (curr_inst & 0xffe0e000) == 0xe8000000
489 || (curr_inst & 0xffe0e000) == 0xe800A000)
490 return (loc + hppa_extract_17 (curr_inst) + 8) & ~0x3;
492 /* Does it look like bv (rp)? Note this depends on the
493 current stack pointer being the same as the stack
494 pointer in the stub itself! This is a branch on from the
495 stub back to the original caller. */
496 /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */
497 else if ((curr_inst & 0xffe0f000) == 0xe840c000)
499 /* Yup. See if the previous instruction loaded
501 if (prev_inst == 0x4bc23ff1)
504 sp = get_frame_register_unsigned (frame, HPPA_SP_REGNUM);
505 return read_memory_integer (sp - 8, 4) & ~0x3;
509 warning (_("Unable to find restore of %%rp before bv (%%rp)."));
510 return orig_pc == pc ? 0 : pc & ~0x3;
514 /* elz: added this case to capture the new instruction
515 at the end of the return part of an export stub used by
516 the PA2.0: BVE, n (rp) */
517 else if ((curr_inst & 0xffe0f000) == 0xe840d000)
519 return (read_memory_integer
520 (get_frame_register_unsigned (frame, HPPA_SP_REGNUM) - 24,
521 gdbarch_ptr_bit (gdbarch) / 8)) & ~0x3;
524 /* What about be,n 0(sr0,%rp)? It's just another way we return to
525 the original caller from the stub. Used in dynamic executables. */
526 else if (curr_inst == 0xe0400002)
528 /* The value we jump to is sitting in sp - 24. But that's
529 loaded several instructions before the be instruction.
530 I guess we could check for the previous instruction being
531 mtsp %r1,%sr0 if we want to do sanity checking. */
532 return (read_memory_integer
533 (get_frame_register_unsigned (frame, HPPA_SP_REGNUM) - 24,
534 gdbarch_ptr_bit (gdbarch) / 8)) & ~0x3;
537 /* Haven't found the branch yet, but we're still in the stub.
544 hppa_skip_permanent_breakpoint (struct regcache *regcache)
546 /* To step over a breakpoint instruction on the PA takes some
547 fiddling with the instruction address queue.
549 When we stop at a breakpoint, the IA queue front (the instruction
550 we're executing now) points at the breakpoint instruction, and
551 the IA queue back (the next instruction to execute) points to
552 whatever instruction we would execute after the breakpoint, if it
553 were an ordinary instruction. This is the case even if the
554 breakpoint is in the delay slot of a branch instruction.
556 Clearly, to step past the breakpoint, we need to set the queue
557 front to the back. But what do we put in the back? What
558 instruction comes after that one? Because of the branch delay
559 slot, the next insn is always at the back + 4. */
561 ULONGEST pcoq_tail, pcsq_tail;
562 regcache_cooked_read_unsigned (regcache, HPPA_PCOQ_TAIL_REGNUM, &pcoq_tail);
563 regcache_cooked_read_unsigned (regcache, HPPA_PCSQ_TAIL_REGNUM, &pcsq_tail);
565 regcache_cooked_write_unsigned (regcache, HPPA_PCOQ_HEAD_REGNUM, pcoq_tail);
566 regcache_cooked_write_unsigned (regcache, HPPA_PCSQ_HEAD_REGNUM, pcsq_tail);
568 regcache_cooked_write_unsigned (regcache, HPPA_PCOQ_TAIL_REGNUM, pcoq_tail + 4);
569 /* We can leave the tail's space the same, since there's no jump. */
574 struct hppa_hpux_sigtramp_unwind_cache
577 struct trad_frame_saved_reg *saved_regs;
580 static int hppa_hpux_tramp_reg[] = {
582 HPPA_PCOQ_HEAD_REGNUM,
583 HPPA_PCSQ_HEAD_REGNUM,
584 HPPA_PCOQ_TAIL_REGNUM,
585 HPPA_PCSQ_TAIL_REGNUM,
612 static struct hppa_hpux_sigtramp_unwind_cache *
613 hppa_hpux_sigtramp_frame_unwind_cache (struct frame_info *next_frame,
617 struct gdbarch *gdbarch = get_frame_arch (next_frame);
618 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
619 struct hppa_hpux_sigtramp_unwind_cache *info;
621 CORE_ADDR sp, scptr, off;
627 info = FRAME_OBSTACK_ZALLOC (struct hppa_hpux_sigtramp_unwind_cache);
629 info->saved_regs = trad_frame_alloc_saved_regs (next_frame);
631 sp = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM);
633 if (IS_32BIT_TARGET (gdbarch))
640 /* See /usr/include/machine/save_state.h for the structure of the save_state_t
643 flag = read_memory_unsigned_integer(scptr + HPPA_HPUX_SS_FLAGS_OFFSET, 4);
645 if (!(flag & HPPA_HPUX_SS_WIDEREGS))
647 /* Narrow registers. */
648 off = scptr + HPPA_HPUX_SS_NARROW_OFFSET;
654 /* Wide registers. */
655 off = scptr + HPPA_HPUX_SS_WIDE_OFFSET + 8;
657 szoff = (tdep->bytes_per_address == 4 ? 4 : 0);
660 for (i = 1; i < 32; i++)
662 info->saved_regs[HPPA_R0_REGNUM + i].addr = off + szoff;
666 for (i = 0; i < ARRAY_SIZE (hppa_hpux_tramp_reg); i++)
668 if (hppa_hpux_tramp_reg[i] > 0)
669 info->saved_regs[hppa_hpux_tramp_reg[i]].addr = off + szoff;
676 info->base = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM);
682 hppa_hpux_sigtramp_frame_this_id (struct frame_info *next_frame,
683 void **this_prologue_cache,
684 struct frame_id *this_id)
686 struct hppa_hpux_sigtramp_unwind_cache *info
687 = hppa_hpux_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache);
688 *this_id = frame_id_build (info->base, frame_pc_unwind (next_frame));
692 hppa_hpux_sigtramp_frame_prev_register (struct frame_info *next_frame,
693 void **this_prologue_cache,
694 int regnum, int *optimizedp,
695 enum lval_type *lvalp,
697 int *realnump, gdb_byte *valuep)
699 struct hppa_hpux_sigtramp_unwind_cache *info
700 = hppa_hpux_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache);
701 hppa_frame_prev_register_helper (next_frame, info->saved_regs, regnum,
702 optimizedp, lvalp, addrp, realnump, valuep);
705 static const struct frame_unwind hppa_hpux_sigtramp_frame_unwind = {
707 hppa_hpux_sigtramp_frame_this_id,
708 hppa_hpux_sigtramp_frame_prev_register
711 static const struct frame_unwind *
712 hppa_hpux_sigtramp_unwind_sniffer (struct frame_info *next_frame)
714 struct unwind_table_entry *u;
715 CORE_ADDR pc = frame_pc_unwind (next_frame);
717 u = find_unwind_entry (pc);
719 /* If this is an export stub, try to get the unwind descriptor for
720 the actual function itself. */
721 if (u && u->stub_unwind.stub_type == EXPORT)
723 gdb_byte buf[HPPA_INSN_SIZE];
726 if (!safe_frame_unwind_memory (next_frame, u->region_start,
730 insn = extract_unsigned_integer (buf, sizeof buf);
731 if ((insn & 0xffe0e000) == 0xe8400000)
732 u = find_unwind_entry(u->region_start + hppa_extract_17 (insn) + 8);
735 if (u && u->HP_UX_interrupt_marker)
736 return &hppa_hpux_sigtramp_frame_unwind;
742 hppa32_hpux_find_global_pointer (struct value *function)
746 faddr = value_as_address (function);
748 /* Is this a plabel? If so, dereference it to get the gp value. */
756 status = target_read_memory (faddr + 4, buf, sizeof (buf));
758 return extract_unsigned_integer (buf, sizeof (buf));
761 return gdbarch_tdep (current_gdbarch)->solib_get_got_by_pc (faddr);
765 hppa64_hpux_find_global_pointer (struct value *function)
770 faddr = value_as_address (function);
772 if (in_opd_section (faddr))
774 target_read_memory (faddr, buf, sizeof (buf));
775 return extract_unsigned_integer (&buf[24], 8);
779 return gdbarch_tdep (current_gdbarch)->solib_get_got_by_pc (faddr);
783 static unsigned int ldsid_pattern[] = {
784 0x000010a0, /* ldsid (rX),rY */
785 0x00001820, /* mtsp rY,sr0 */
786 0xe0000000 /* be,n (sr0,rX) */
790 hppa_hpux_search_pattern (CORE_ADDR start, CORE_ADDR end,
791 unsigned int *patterns, int count)
793 int num_insns = (end - start + HPPA_INSN_SIZE) / HPPA_INSN_SIZE;
798 buf = alloca (num_insns * HPPA_INSN_SIZE);
799 insns = alloca (num_insns * sizeof (unsigned int));
801 read_memory (start, buf, num_insns * HPPA_INSN_SIZE);
802 for (i = 0; i < num_insns; i++, buf += HPPA_INSN_SIZE)
803 insns[i] = extract_unsigned_integer (buf, HPPA_INSN_SIZE);
805 for (offset = 0; offset <= num_insns - count; offset++)
807 for (i = 0; i < count; i++)
809 if ((insns[offset + i] & patterns[i]) != patterns[i])
816 if (offset <= num_insns - count)
817 return start + offset * HPPA_INSN_SIZE;
823 hppa32_hpux_search_dummy_call_sequence (struct gdbarch *gdbarch, CORE_ADDR pc,
827 struct obj_section *sec;
828 struct hppa_objfile_private *priv;
829 struct frame_info *frame;
830 struct unwind_table_entry *u;
835 sec = find_pc_section (pc);
837 priv = objfile_data (obj, hppa_objfile_priv_data);
840 priv = hppa_init_objfile_priv_data (obj);
842 error (_("Internal error creating objfile private data."));
844 /* Use the cached value if we have one. */
845 if (priv->dummy_call_sequence_addr != 0)
847 *argreg = priv->dummy_call_sequence_reg;
848 return priv->dummy_call_sequence_addr;
851 /* First try a heuristic; if we are in a shared library call, our return
852 pointer is likely to point at an export stub. */
853 frame = get_current_frame ();
854 rp = frame_unwind_register_unsigned (frame, 2);
855 u = find_unwind_entry (rp);
856 if (u && u->stub_unwind.stub_type == EXPORT)
858 addr = hppa_hpux_search_pattern (u->region_start, u->region_end,
860 ARRAY_SIZE (ldsid_pattern));
865 /* Next thing to try is to look for an export stub. */
866 if (priv->unwind_info)
870 for (i = 0; i < priv->unwind_info->last; i++)
872 struct unwind_table_entry *u;
873 u = &priv->unwind_info->table[i];
874 if (u->stub_unwind.stub_type == EXPORT)
876 addr = hppa_hpux_search_pattern (u->region_start, u->region_end,
878 ARRAY_SIZE (ldsid_pattern));
887 /* Finally, if this is the main executable, try to locate a sequence
889 addr = hppa_symbol_address ("noshlibs");
890 sec = find_pc_section (addr);
892 if (sec && sec->objfile == obj)
894 CORE_ADDR start, end;
896 find_pc_partial_function (addr, NULL, &start, &end);
897 if (start != 0 && end != 0)
899 addr = hppa_hpux_search_pattern (start, end, ldsid_pattern,
900 ARRAY_SIZE (ldsid_pattern));
906 /* Can't find a suitable sequence. */
910 target_read_memory (addr, buf, sizeof (buf));
911 insn = extract_unsigned_integer (buf, sizeof (buf));
912 priv->dummy_call_sequence_addr = addr;
913 priv->dummy_call_sequence_reg = (insn >> 21) & 0x1f;
915 *argreg = priv->dummy_call_sequence_reg;
916 return priv->dummy_call_sequence_addr;
920 hppa64_hpux_search_dummy_call_sequence (struct gdbarch *gdbarch, CORE_ADDR pc,
924 struct obj_section *sec;
925 struct hppa_objfile_private *priv;
927 struct minimal_symbol *msym;
930 sec = find_pc_section (pc);
932 priv = objfile_data (obj, hppa_objfile_priv_data);
935 priv = hppa_init_objfile_priv_data (obj);
937 error (_("Internal error creating objfile private data."));
939 /* Use the cached value if we have one. */
940 if (priv->dummy_call_sequence_addr != 0)
942 *argreg = priv->dummy_call_sequence_reg;
943 return priv->dummy_call_sequence_addr;
946 /* FIXME: Without stub unwind information, locating a suitable sequence is
947 fairly difficult. For now, we implement a very naive and inefficient
948 scheme; try to read in blocks of code, and look for a "bve,n (rp)"
949 instruction. These are likely to occur at the end of functions, so
950 we only look at the last two instructions of each function. */
951 for (i = 0, msym = obj->msymbols; i < obj->minimal_symbol_count; i++, msym++)
953 CORE_ADDR begin, end;
955 gdb_byte buf[2 * HPPA_INSN_SIZE];
958 find_pc_partial_function (SYMBOL_VALUE_ADDRESS (msym), &name,
961 if (name == NULL || begin == 0 || end == 0)
964 if (target_read_memory (end - sizeof (buf), buf, sizeof (buf)) == 0)
966 for (offset = 0; offset < sizeof (buf); offset++)
970 insn = extract_unsigned_integer (buf + offset, HPPA_INSN_SIZE);
971 if (insn == 0xe840d002) /* bve,n (rp) */
973 addr = (end - sizeof (buf)) + offset;
980 /* Can't find a suitable sequence. */
984 priv->dummy_call_sequence_addr = addr;
985 /* Right now we only look for a "bve,l (rp)" sequence, so the register is
986 always HPPA_RP_REGNUM. */
987 priv->dummy_call_sequence_reg = HPPA_RP_REGNUM;
989 *argreg = priv->dummy_call_sequence_reg;
990 return priv->dummy_call_sequence_addr;
994 hppa_hpux_find_import_stub_for_addr (CORE_ADDR funcaddr)
996 struct objfile *objfile;
997 struct minimal_symbol *funsym, *stubsym;
1000 funsym = lookup_minimal_symbol_by_pc (funcaddr);
1003 ALL_OBJFILES (objfile)
1005 stubsym = lookup_minimal_symbol_solib_trampoline
1006 (SYMBOL_LINKAGE_NAME (funsym), objfile);
1010 struct unwind_table_entry *u;
1012 u = find_unwind_entry (SYMBOL_VALUE (stubsym));
1014 || (u->stub_unwind.stub_type != IMPORT
1015 && u->stub_unwind.stub_type != IMPORT_SHLIB))
1018 stubaddr = SYMBOL_VALUE (stubsym);
1020 /* If we found an IMPORT stub, then we can stop searching;
1021 if we found an IMPORT_SHLIB, we want to continue the search
1022 in the hopes that we will find an IMPORT stub. */
1023 if (u->stub_unwind.stub_type == IMPORT)
1032 hppa_hpux_sr_for_addr (CORE_ADDR addr)
1035 /* The space register to use is encoded in the top 2 bits of the address. */
1036 sr = addr >> (gdbarch_tdep (current_gdbarch)->bytes_per_address * 8 - 2);
1041 hppa_hpux_find_dummy_bpaddr (CORE_ADDR addr)
1043 /* In order for us to restore the space register to its starting state,
1044 we need the dummy trampoline to return to the an instruction address in
1045 the same space as where we started the call. We used to place the
1046 breakpoint near the current pc, however, this breaks nested dummy calls
1047 as the nested call will hit the breakpoint address and terminate
1048 prematurely. Instead, we try to look for an address in the same space to
1051 This is similar in spirit to putting the breakpoint at the "entry point"
1052 of an executable. */
1054 struct obj_section *sec;
1055 struct unwind_table_entry *u;
1056 struct minimal_symbol *msym;
1060 sec = find_pc_section (addr);
1063 /* First try the lowest address in the section; we can use it as long
1064 as it is "regular" code (i.e. not a stub) */
1065 u = find_unwind_entry (sec->addr);
1066 if (!u || u->stub_unwind.stub_type == 0)
1069 /* Otherwise, we need to find a symbol for a regular function. We
1070 do this by walking the list of msymbols in the objfile. The symbol
1071 we find should not be the same as the function that was passed in. */
1073 /* FIXME: this is broken, because we can find a function that will be
1074 called by the dummy call target function, which will still not
1077 find_pc_partial_function (addr, NULL, &func, NULL);
1078 for (i = 0, msym = sec->objfile->msymbols;
1079 i < sec->objfile->minimal_symbol_count;
1082 u = find_unwind_entry (SYMBOL_VALUE_ADDRESS (msym));
1083 if (func != SYMBOL_VALUE_ADDRESS (msym)
1084 && (!u || u->stub_unwind.stub_type == 0))
1085 return SYMBOL_VALUE_ADDRESS (msym);
1089 warning (_("Cannot find suitable address to place dummy breakpoint; nested "
1090 "calls may fail."));
1095 hppa_hpux_push_dummy_code (struct gdbarch *gdbarch, CORE_ADDR sp,
1097 struct value **args, int nargs,
1098 struct type *value_type,
1099 CORE_ADDR *real_pc, CORE_ADDR *bp_addr,
1100 struct regcache *regcache)
1102 CORE_ADDR pc, stubaddr;
1107 /* Note: we don't want to pass a function descriptor here; push_dummy_call
1108 fills in the PIC register for us. */
1109 funcaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funcaddr, NULL);
1111 /* The simple case is where we call a function in the same space that we are
1112 currently in; in that case we don't really need to do anything. */
1113 if (hppa_hpux_sr_for_addr (pc) == hppa_hpux_sr_for_addr (funcaddr))
1115 /* Intraspace call. */
1116 *bp_addr = hppa_hpux_find_dummy_bpaddr (pc);
1117 *real_pc = funcaddr;
1118 regcache_cooked_write_unsigned (regcache, HPPA_RP_REGNUM, *bp_addr);
1123 /* In order to make an interspace call, we need to go through a stub.
1124 gcc supplies an appropriate stub called "__gcc_plt_call", however, if
1125 an application is compiled with HP compilers then this stub is not
1126 available. We used to fallback to "__d_plt_call", however that stub
1127 is not entirely useful for us because it doesn't do an interspace
1128 return back to the caller. Also, on hppa64-hpux, there is no
1129 __gcc_plt_call available. In order to keep the code uniform, we
1130 instead don't use either of these stubs, but instead write our own
1133 A problem arises since the stack is located in a different space than
1134 code, so in order to branch to a stack stub, we will need to do an
1135 interspace branch. Previous versions of gdb did this by modifying code
1136 at the current pc and doing single-stepping to set the pcsq. Since this
1137 is highly undesirable, we use a different scheme:
1139 All we really need to do the branch to the stub is a short instruction
1150 Instead of writing these sequences ourselves, we can find it in
1151 the instruction stream that belongs to the current space. While this
1152 seems difficult at first, we are actually guaranteed to find the sequences
1156 - in export stubs for shared libraries
1157 - in the "noshlibs" routine in the main module
1160 - at the end of each "regular" function
1162 We cache the address of these sequences in the objfile's private data
1163 since these operations can potentially be quite expensive.
1166 - write a stack trampoline
1167 - look for a suitable instruction sequence in the current space
1168 - point the sequence at the trampoline
1169 - set the return address of the trampoline to the current space
1170 (see hppa_hpux_find_dummy_call_bpaddr)
1171 - set the continuing address of the "dummy code" as the sequence.
1175 if (IS_32BIT_TARGET (gdbarch))
1177 static unsigned int hppa32_tramp[] = {
1178 0x0fdf1291, /* stw r31,-8(,sp) */
1179 0x02c010a1, /* ldsid (,r22),r1 */
1180 0x00011820, /* mtsp r1,sr0 */
1181 0xe6c00000, /* be,l 0(sr0,r22),%sr0,%r31 */
1182 0x081f0242, /* copy r31,rp */
1183 0x0fd11082, /* ldw -8(,sp),rp */
1184 0x004010a1, /* ldsid (,rp),r1 */
1185 0x00011820, /* mtsp r1,sr0 */
1186 0xe0400000, /* be 0(sr0,rp) */
1187 0x08000240 /* nop */
1190 /* for hppa32, we must call the function through a stub so that on
1191 return it can return to the space of our trampoline. */
1192 stubaddr = hppa_hpux_find_import_stub_for_addr (funcaddr);
1194 error (_("Cannot call external function not referenced by application "
1195 "(no import stub).\n"));
1196 regcache_cooked_write_unsigned (regcache, 22, stubaddr);
1198 write_memory (sp, (char *)&hppa32_tramp, sizeof (hppa32_tramp));
1200 *bp_addr = hppa_hpux_find_dummy_bpaddr (pc);
1201 regcache_cooked_write_unsigned (regcache, 31, *bp_addr);
1203 *real_pc = hppa32_hpux_search_dummy_call_sequence (gdbarch, pc, &argreg);
1205 error (_("Cannot make interspace call from here."));
1207 regcache_cooked_write_unsigned (regcache, argreg, sp);
1209 sp += sizeof (hppa32_tramp);
1213 static unsigned int hppa64_tramp[] = {
1214 0xeac0f000, /* bve,l (r22),%r2 */
1215 0x0fdf12d1, /* std r31,-8(,sp) */
1216 0x0fd110c2, /* ldd -8(,sp),rp */
1217 0xe840d002, /* bve,n (rp) */
1218 0x08000240 /* nop */
1221 /* for hppa64, we don't need to call through a stub; all functions
1222 return via a bve. */
1223 regcache_cooked_write_unsigned (regcache, 22, funcaddr);
1224 write_memory (sp, (char *)&hppa64_tramp, sizeof (hppa64_tramp));
1227 regcache_cooked_write_unsigned (regcache, 31, *bp_addr);
1229 *real_pc = hppa64_hpux_search_dummy_call_sequence (gdbarch, pc, &argreg);
1231 error (_("Cannot make interspace call from here."));
1233 regcache_cooked_write_unsigned (regcache, argreg, sp);
1235 sp += sizeof (hppa64_tramp);
1238 sp = gdbarch_frame_align (gdbarch, sp);
1246 hppa_hpux_supply_ss_narrow (struct regcache *regcache,
1247 int regnum, const char *save_state)
1249 const char *ss_narrow = save_state + HPPA_HPUX_SS_NARROW_OFFSET;
1252 for (i = HPPA_R1_REGNUM; i < HPPA_FP0_REGNUM; i++)
1254 if (regnum == i || regnum == -1)
1255 regcache_raw_supply (regcache, i, ss_narrow + offset);
1262 hppa_hpux_supply_ss_fpblock (struct regcache *regcache,
1263 int regnum, const char *save_state)
1265 const char *ss_fpblock = save_state + HPPA_HPUX_SS_FPBLOCK_OFFSET;
1268 /* FIXME: We view the floating-point state as 64 single-precision
1269 registers for 32-bit code, and 32 double-precision register for
1270 64-bit code. This distinction is artificial and should be
1271 eliminated. If that ever happens, we should remove the if-clause
1274 if (register_size (get_regcache_arch (regcache), HPPA_FP0_REGNUM) == 4)
1276 for (i = HPPA_FP0_REGNUM; i < HPPA_FP0_REGNUM + 64; i++)
1278 if (regnum == i || regnum == -1)
1279 regcache_raw_supply (regcache, i, ss_fpblock + offset);
1286 for (i = HPPA_FP0_REGNUM; i < HPPA_FP0_REGNUM + 32; i++)
1288 if (regnum == i || regnum == -1)
1289 regcache_raw_supply (regcache, i, ss_fpblock + offset);
1297 hppa_hpux_supply_ss_wide (struct regcache *regcache,
1298 int regnum, const char *save_state)
1300 const char *ss_wide = save_state + HPPA_HPUX_SS_WIDE_OFFSET;
1303 if (register_size (get_regcache_arch (regcache), HPPA_R1_REGNUM) == 4)
1306 for (i = HPPA_R1_REGNUM; i < HPPA_FP0_REGNUM; i++)
1308 if (regnum == i || regnum == -1)
1309 regcache_raw_supply (regcache, i, ss_wide + offset);
1316 hppa_hpux_supply_save_state (const struct regset *regset,
1317 struct regcache *regcache,
1318 int regnum, const void *regs, size_t len)
1320 const char *proc_info = regs;
1321 const char *save_state = proc_info + 8;
1324 flags = extract_unsigned_integer (save_state + HPPA_HPUX_SS_FLAGS_OFFSET, 4);
1325 if (regnum == -1 || regnum == HPPA_FLAGS_REGNUM)
1327 struct gdbarch *arch = get_regcache_arch (regcache);
1328 size_t size = register_size (arch, HPPA_FLAGS_REGNUM);
1331 store_unsigned_integer (buf, size, flags);
1332 regcache_raw_supply (regcache, HPPA_FLAGS_REGNUM, buf);
1335 /* If the SS_WIDEREGS flag is set, we really do need the full
1336 `struct save_state'. */
1337 if (flags & HPPA_HPUX_SS_WIDEREGS && len < HPPA_HPUX_SAVE_STATE_SIZE)
1338 error (_("Register set contents too small"));
1340 if (flags & HPPA_HPUX_SS_WIDEREGS)
1341 hppa_hpux_supply_ss_wide (regcache, regnum, save_state);
1343 hppa_hpux_supply_ss_narrow (regcache, regnum, save_state);
1345 hppa_hpux_supply_ss_fpblock (regcache, regnum, save_state);
1348 /* HP-UX register set. */
1350 static struct regset hppa_hpux_regset =
1353 hppa_hpux_supply_save_state
1356 static const struct regset *
1357 hppa_hpux_regset_from_core_section (struct gdbarch *gdbarch,
1358 const char *sect_name, size_t sect_size)
1360 if (strcmp (sect_name, ".reg") == 0
1361 && sect_size >= HPPA_HPUX_PA89_SAVE_STATE_SIZE + 8)
1362 return &hppa_hpux_regset;
1368 /* Bit in the `ss_flag' member of `struct save_state' that indicates
1369 the state was saved from a system call. From
1370 <machine/save_state.h>. */
1371 #define HPPA_HPUX_SS_INSYSCALL 0x02
1374 hppa_hpux_read_pc (struct regcache *regcache)
1378 /* If we're currently in a system call return the contents of %r31. */
1379 regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags);
1380 if (flags & HPPA_HPUX_SS_INSYSCALL)
1383 regcache_cooked_read_unsigned (regcache, HPPA_R31_REGNUM, &pc);
1387 return hppa_read_pc (regcache);
1391 hppa_hpux_write_pc (struct regcache *regcache, CORE_ADDR pc)
1395 /* If we're currently in a system call also write PC into %r31. */
1396 regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags);
1397 if (flags & HPPA_HPUX_SS_INSYSCALL)
1398 regcache_cooked_write_unsigned (regcache, HPPA_R31_REGNUM, pc | 0x3);
1400 return hppa_write_pc (regcache, pc);
1404 hppa_hpux_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
1408 /* If we're currently in a system call return the contents of %r31. */
1409 flags = frame_unwind_register_unsigned (next_frame, HPPA_FLAGS_REGNUM);
1410 if (flags & HPPA_HPUX_SS_INSYSCALL)
1411 return frame_unwind_register_unsigned (next_frame, HPPA_R31_REGNUM) & ~0x3;
1413 return hppa_unwind_pc (gdbarch, next_frame);
1417 /* Given the current value of the pc, check to see if it is inside a stub, and
1418 if so, change the value of the pc to point to the caller of the stub.
1419 NEXT_FRAME is the next frame in the current list of frames.
1420 BASE contains to stack frame base of the current frame.
1421 SAVE_REGS is the register file stored in the frame cache. */
1423 hppa_hpux_unwind_adjust_stub (struct frame_info *next_frame, CORE_ADDR base,
1424 struct trad_frame_saved_reg *saved_regs)
1426 struct gdbarch *gdbarch = get_frame_arch (next_frame);
1427 int optimized, realreg;
1428 enum lval_type lval;
1430 char buffer[sizeof(ULONGEST)];
1433 struct unwind_table_entry *u;
1435 trad_frame_get_prev_register (next_frame, saved_regs,
1436 HPPA_PCOQ_HEAD_REGNUM,
1437 &optimized, &lval, &addr, &realreg, buffer);
1438 val = extract_unsigned_integer (buffer,
1439 register_size (get_frame_arch (next_frame),
1440 HPPA_PCOQ_HEAD_REGNUM));
1442 u = find_unwind_entry (val);
1443 if (u && u->stub_unwind.stub_type == EXPORT)
1445 stubpc = read_memory_integer
1446 (base - 24, gdbarch_ptr_bit (gdbarch) / 8);
1447 trad_frame_set_value (saved_regs, HPPA_PCOQ_HEAD_REGNUM, stubpc);
1449 else if (hppa_symbol_address ("__gcc_plt_call")
1450 == get_pc_function_start (val))
1452 stubpc = read_memory_integer
1453 (base - 8, gdbarch_ptr_bit (gdbarch) / 8);
1454 trad_frame_set_value (saved_regs, HPPA_PCOQ_HEAD_REGNUM, stubpc);
1459 hppa_hpux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
1461 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1463 if (IS_32BIT_TARGET (gdbarch))
1464 tdep->in_solib_call_trampoline = hppa32_hpux_in_solib_call_trampoline;
1466 tdep->in_solib_call_trampoline = hppa64_hpux_in_solib_call_trampoline;
1468 tdep->unwind_adjust_stub = hppa_hpux_unwind_adjust_stub;
1470 set_gdbarch_in_solib_return_trampoline
1471 (gdbarch, hppa_hpux_in_solib_return_trampoline);
1472 set_gdbarch_skip_trampoline_code (gdbarch, hppa_hpux_skip_trampoline_code);
1474 set_gdbarch_push_dummy_code (gdbarch, hppa_hpux_push_dummy_code);
1475 set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
1477 set_gdbarch_read_pc (gdbarch, hppa_hpux_read_pc);
1478 set_gdbarch_write_pc (gdbarch, hppa_hpux_write_pc);
1479 set_gdbarch_unwind_pc (gdbarch, hppa_hpux_unwind_pc);
1480 set_gdbarch_skip_permanent_breakpoint
1481 (gdbarch, hppa_skip_permanent_breakpoint);
1483 set_gdbarch_regset_from_core_section
1484 (gdbarch, hppa_hpux_regset_from_core_section);
1486 frame_unwind_append_sniffer (gdbarch, hppa_hpux_sigtramp_unwind_sniffer);
1490 hppa_hpux_som_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
1492 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1496 tdep->find_global_pointer = hppa32_hpux_find_global_pointer;
1498 hppa_hpux_init_abi (info, gdbarch);
1499 som_solib_select (tdep);
1503 hppa_hpux_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
1505 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1508 tdep->find_global_pointer = hppa64_hpux_find_global_pointer;
1510 hppa_hpux_init_abi (info, gdbarch);
1511 pa64_solib_select (tdep);
1514 static enum gdb_osabi
1515 hppa_hpux_core_osabi_sniffer (bfd *abfd)
1517 if (strcmp (bfd_get_target (abfd), "hpux-core") == 0)
1518 return GDB_OSABI_HPUX_SOM;
1519 else if (strcmp (bfd_get_target (abfd), "elf64-hppa") == 0)
1523 section = bfd_get_section_by_name (abfd, ".kernel");
1529 size = bfd_section_size (abfd, section);
1530 contents = alloca (size);
1531 if (bfd_get_section_contents (abfd, section, contents,
1533 && strcmp (contents, "HP-UX") == 0)
1534 return GDB_OSABI_HPUX_ELF;
1538 return GDB_OSABI_UNKNOWN;
1542 _initialize_hppa_hpux_tdep (void)
1544 /* BFD doesn't set a flavour for HP-UX style core files. It doesn't
1545 set the architecture either. */
1546 gdbarch_register_osabi_sniffer (bfd_arch_unknown,
1547 bfd_target_unknown_flavour,
1548 hppa_hpux_core_osabi_sniffer);
1549 gdbarch_register_osabi_sniffer (bfd_arch_hppa,
1550 bfd_target_elf_flavour,
1551 hppa_hpux_core_osabi_sniffer);
1553 gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_HPUX_SOM,
1554 hppa_hpux_som_init_abi);
1555 gdbarch_register_osabi (bfd_arch_hppa, bfd_mach_hppa20w, GDB_OSABI_HPUX_ELF,
1556 hppa_hpux_elf_init_abi);