1 /* Target-dependent code for HP-UX on PA-RISC.
3 Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "arch-utils.h"
26 #include "frame-unwind.h"
27 #include "trad-frame.h"
33 #include "hppa-tdep.h"
34 #include "solib-som.h"
35 #include "solib-pa64.h"
38 #include "exceptions.h"
40 #include "gdb_string.h"
42 #define IS_32BIT_TARGET(_gdbarch) \
43 ((gdbarch_tdep (_gdbarch))->bytes_per_address == 4)
45 /* Bit in the `ss_flag' member of `struct save_state' that indicates
46 that the 64-bit register values are live. From
47 <machine/save_state.h>. */
48 #define HPPA_HPUX_SS_WIDEREGS 0x40
50 /* Offsets of various parts of `struct save_state'. From
51 <machine/save_state.h>. */
52 #define HPPA_HPUX_SS_FLAGS_OFFSET 0
53 #define HPPA_HPUX_SS_NARROW_OFFSET 4
54 #define HPPA_HPUX_SS_FPBLOCK_OFFSET 256
55 #define HPPA_HPUX_SS_WIDE_OFFSET 640
57 /* The size of `struct save_state. */
58 #define HPPA_HPUX_SAVE_STATE_SIZE 1152
60 /* The size of `struct pa89_save_state', which corresponds to PA-RISC
61 1.1, the lowest common denominator that we support. */
62 #define HPPA_HPUX_PA89_SAVE_STATE_SIZE 512
65 /* Forward declarations. */
66 extern void _initialize_hppa_hpux_tdep (void);
67 extern initialize_file_ftype _initialize_hppa_hpux_tdep;
70 in_opd_section (CORE_ADDR pc)
72 struct obj_section *s;
75 s = find_pc_section (pc);
78 && s->the_bfd_section->name != NULL
79 && strcmp (s->the_bfd_section->name, ".opd") == 0);
83 /* Return one if PC is in the call path of a trampoline, else return zero.
85 Note we return one for *any* call trampoline (long-call, arg-reloc), not
86 just shared library trampolines (import, export). */
89 hppa32_hpux_in_solib_call_trampoline (CORE_ADDR pc, char *name)
91 struct minimal_symbol *minsym;
92 struct unwind_table_entry *u;
94 /* First see if PC is in one of the two C-library trampolines. */
95 if (pc == hppa_symbol_address("$$dyncall")
96 || pc == hppa_symbol_address("_sr4export"))
99 minsym = lookup_minimal_symbol_by_pc (pc);
100 if (minsym && strcmp (SYMBOL_LINKAGE_NAME (minsym), ".stub") == 0)
103 /* Get the unwind descriptor corresponding to PC, return zero
104 if no unwind was found. */
105 u = find_unwind_entry (pc);
109 /* If this isn't a linker stub, then return now. */
110 if (u->stub_unwind.stub_type == 0)
113 /* By definition a long-branch stub is a call stub. */
114 if (u->stub_unwind.stub_type == LONG_BRANCH)
117 /* The call and return path execute the same instructions within
118 an IMPORT stub! So an IMPORT stub is both a call and return
120 if (u->stub_unwind.stub_type == IMPORT)
123 /* Parameter relocation stubs always have a call path and may have a
125 if (u->stub_unwind.stub_type == PARAMETER_RELOCATION
126 || u->stub_unwind.stub_type == EXPORT)
130 /* Search forward from the current PC until we hit a branch
131 or the end of the stub. */
132 for (addr = pc; addr <= u->region_end; addr += 4)
136 insn = read_memory_integer (addr, 4);
138 /* Does it look like a bl? If so then it's the call path, if
139 we find a bv or be first, then we're on the return path. */
140 if ((insn & 0xfc00e000) == 0xe8000000)
142 else if ((insn & 0xfc00e001) == 0xe800c000
143 || (insn & 0xfc000000) == 0xe0000000)
147 /* Should never happen. */
148 warning (_("Unable to find branch in parameter relocation stub."));
152 /* Unknown stub type. For now, just return zero. */
157 hppa64_hpux_in_solib_call_trampoline (CORE_ADDR pc, char *name)
159 /* PA64 has a completely different stub/trampoline scheme. Is it
160 better? Maybe. It's certainly harder to determine with any
161 certainty that we are in a stub because we can not refer to the
164 The heuristic is simple. Try to lookup the current PC value in th
165 minimal symbol table. If that fails, then assume we are not in a
168 Then see if the PC value falls within the section bounds for the
169 section containing the minimal symbol we found in the first
170 step. If it does, then assume we are not in a stub and return.
172 Finally peek at the instructions to see if they look like a stub. */
173 struct minimal_symbol *minsym;
178 minsym = lookup_minimal_symbol_by_pc (pc);
182 sec = SYMBOL_OBJ_SECTION (minsym)->the_bfd_section;
184 if (bfd_get_section_vma (sec->owner, sec) <= pc
185 && pc < (bfd_get_section_vma (sec->owner, sec)
186 + bfd_section_size (sec->owner, sec)))
189 /* We might be in a stub. Peek at the instructions. Stubs are 3
190 instructions long. */
191 insn = read_memory_integer (pc, 4);
193 /* Find out where we think we are within the stub. */
194 if ((insn & 0xffffc00e) == 0x53610000)
196 else if ((insn & 0xffffffff) == 0xe820d000)
198 else if ((insn & 0xffffc00e) == 0x537b0000)
203 /* Now verify each insn in the range looks like a stub instruction. */
204 insn = read_memory_integer (addr, 4);
205 if ((insn & 0xffffc00e) != 0x53610000)
208 /* Now verify each insn in the range looks like a stub instruction. */
209 insn = read_memory_integer (addr + 4, 4);
210 if ((insn & 0xffffffff) != 0xe820d000)
213 /* Now verify each insn in the range looks like a stub instruction. */
214 insn = read_memory_integer (addr + 8, 4);
215 if ((insn & 0xffffc00e) != 0x537b0000)
218 /* Looks like a stub. */
222 /* Return one if PC is in the return path of a trampoline, else return zero.
224 Note we return one for *any* call trampoline (long-call, arg-reloc), not
225 just shared library trampolines (import, export). */
228 hppa_hpux_in_solib_return_trampoline (CORE_ADDR pc, char *name)
230 struct unwind_table_entry *u;
232 /* Get the unwind descriptor corresponding to PC, return zero
233 if no unwind was found. */
234 u = find_unwind_entry (pc);
238 /* If this isn't a linker stub or it's just a long branch stub, then
240 if (u->stub_unwind.stub_type == 0 || u->stub_unwind.stub_type == LONG_BRANCH)
243 /* The call and return path execute the same instructions within
244 an IMPORT stub! So an IMPORT stub is both a call and return
246 if (u->stub_unwind.stub_type == IMPORT)
249 /* Parameter relocation stubs always have a call path and may have a
251 if (u->stub_unwind.stub_type == PARAMETER_RELOCATION
252 || u->stub_unwind.stub_type == EXPORT)
256 /* Search forward from the current PC until we hit a branch
257 or the end of the stub. */
258 for (addr = pc; addr <= u->region_end; addr += 4)
262 insn = read_memory_integer (addr, 4);
264 /* Does it look like a bl? If so then it's the call path, if
265 we find a bv or be first, then we're on the return path. */
266 if ((insn & 0xfc00e000) == 0xe8000000)
268 else if ((insn & 0xfc00e001) == 0xe800c000
269 || (insn & 0xfc000000) == 0xe0000000)
273 /* Should never happen. */
274 warning (_("Unable to find branch in parameter relocation stub."));
278 /* Unknown stub type. For now, just return zero. */
283 /* Figure out if PC is in a trampoline, and if so find out where
284 the trampoline will jump to. If not in a trampoline, return zero.
286 Simple code examination probably is not a good idea since the code
287 sequences in trampolines can also appear in user code.
289 We use unwinds and information from the minimal symbol table to
290 determine when we're in a trampoline. This won't work for ELF
291 (yet) since it doesn't create stub unwind entries. Whether or
292 not ELF will create stub unwinds or normal unwinds for linker
293 stubs is still being debated.
295 This should handle simple calls through dyncall or sr4export,
296 long calls, argument relocation stubs, and dyncall/sr4export
297 calling an argument relocation stub. It even handles some stubs
298 used in dynamic executables. */
301 hppa_hpux_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
303 struct gdbarch *gdbarch = get_frame_arch (frame);
305 long prev_inst, curr_inst, loc;
306 struct minimal_symbol *msym;
307 struct unwind_table_entry *u;
309 /* Addresses passed to dyncall may *NOT* be the actual address
310 of the function. So we may have to do something special. */
311 if (pc == hppa_symbol_address("$$dyncall"))
313 pc = (CORE_ADDR) get_frame_register_unsigned (frame, 22);
315 /* If bit 30 (counting from the left) is on, then pc is the address of
316 the PLT entry for this function, not the address of the function
317 itself. Bit 31 has meaning too, but only for MPE. */
319 pc = (CORE_ADDR) read_memory_integer
320 (pc & ~0x3, gdbarch_ptr_bit (gdbarch) / 8);
322 if (pc == hppa_symbol_address("$$dyncall_external"))
324 pc = (CORE_ADDR) get_frame_register_unsigned (frame, 22);
325 pc = (CORE_ADDR) read_memory_integer
326 (pc & ~0x3, gdbarch_ptr_bit (gdbarch) / 8);
328 else if (pc == hppa_symbol_address("_sr4export"))
329 pc = (CORE_ADDR) get_frame_register_unsigned (frame, 22);
331 /* Get the unwind descriptor corresponding to PC, return zero
332 if no unwind was found. */
333 u = find_unwind_entry (pc);
337 /* If this isn't a linker stub, then return now. */
338 /* elz: attention here! (FIXME) because of a compiler/linker
339 error, some stubs which should have a non zero stub_unwind.stub_type
340 have unfortunately a value of zero. So this function would return here
341 as if we were not in a trampoline. To fix this, we go look at the partial
342 symbol information, which reports this guy as a stub.
343 (FIXME): Unfortunately, we are not that lucky: it turns out that the
344 partial symbol information is also wrong sometimes. This is because
345 when it is entered (somread.c::som_symtab_read()) it can happen that
346 if the type of the symbol (from the som) is Entry, and the symbol is
347 in a shared library, then it can also be a trampoline. This would
348 be OK, except that I believe the way they decide if we are ina shared library
349 does not work. SOOOO..., even if we have a regular function w/o trampolines
350 its minimal symbol can be assigned type mst_solib_trampoline.
351 Also, if we find that the symbol is a real stub, then we fix the unwind
352 descriptor, and define the stub type to be EXPORT.
353 Hopefully this is correct most of the times. */
354 if (u->stub_unwind.stub_type == 0)
357 /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed
358 we can delete all the code which appears between the lines */
359 /*--------------------------------------------------------------------------*/
360 msym = lookup_minimal_symbol_by_pc (pc);
362 if (msym == NULL || MSYMBOL_TYPE (msym) != mst_solib_trampoline)
363 return orig_pc == pc ? 0 : pc & ~0x3;
365 else if (msym != NULL && MSYMBOL_TYPE (msym) == mst_solib_trampoline)
367 struct objfile *objfile;
368 struct minimal_symbol *msymbol;
369 int function_found = 0;
371 /* go look if there is another minimal symbol with the same name as
372 this one, but with type mst_text. This would happen if the msym
373 is an actual trampoline, in which case there would be another
374 symbol with the same name corresponding to the real function */
376 ALL_MSYMBOLS (objfile, msymbol)
378 if (MSYMBOL_TYPE (msymbol) == mst_text
379 && strcmp (SYMBOL_LINKAGE_NAME (msymbol),
380 SYMBOL_LINKAGE_NAME (msym)) == 0)
388 /* the type of msym is correct (mst_solib_trampoline), but
389 the unwind info is wrong, so set it to the correct value */
390 u->stub_unwind.stub_type = EXPORT;
392 /* the stub type info in the unwind is correct (this is not a
393 trampoline), but the msym type information is wrong, it
394 should be mst_text. So we need to fix the msym, and also
395 get out of this function */
397 MSYMBOL_TYPE (msym) = mst_text;
398 return orig_pc == pc ? 0 : pc & ~0x3;
402 /*--------------------------------------------------------------------------*/
405 /* It's a stub. Search for a branch and figure out where it goes.
406 Note we have to handle multi insn branch sequences like ldil;ble.
407 Most (all?) other branches can be determined by examining the contents
408 of certain registers and the stack. */
415 /* Make sure we haven't walked outside the range of this stub. */
416 if (u != find_unwind_entry (loc))
418 warning (_("Unable to find branch in linker stub"));
419 return orig_pc == pc ? 0 : pc & ~0x3;
422 prev_inst = curr_inst;
423 curr_inst = read_memory_integer (loc, 4);
425 /* Does it look like a branch external using %r1? Then it's the
426 branch from the stub to the actual function. */
427 if ((curr_inst & 0xffe0e000) == 0xe0202000)
429 /* Yup. See if the previous instruction loaded
430 a value into %r1. If so compute and return the jump address. */
431 if ((prev_inst & 0xffe00000) == 0x20200000)
432 return (hppa_extract_21 (prev_inst) + hppa_extract_17 (curr_inst)) & ~0x3;
435 warning (_("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1)."));
436 return orig_pc == pc ? 0 : pc & ~0x3;
440 /* Does it look like a be 0(sr0,%r21)? OR
441 Does it look like a be, n 0(sr0,%r21)? OR
442 Does it look like a bve (r21)? (this is on PA2.0)
443 Does it look like a bve, n(r21)? (this is also on PA2.0)
444 That's the branch from an
445 import stub to an export stub.
447 It is impossible to determine the target of the branch via
448 simple examination of instructions and/or data (consider
449 that the address in the plabel may be the address of the
450 bind-on-reference routine in the dynamic loader).
452 So we have try an alternative approach.
454 Get the name of the symbol at our current location; it should
455 be a stub symbol with the same name as the symbol in the
458 Then lookup a minimal symbol with the same name; we should
459 get the minimal symbol for the target routine in the shared
460 library as those take precedence of import/export stubs. */
461 if ((curr_inst == 0xe2a00000) ||
462 (curr_inst == 0xe2a00002) ||
463 (curr_inst == 0xeaa0d000) ||
464 (curr_inst == 0xeaa0d002))
466 struct minimal_symbol *stubsym, *libsym;
468 stubsym = lookup_minimal_symbol_by_pc (loc);
471 warning (_("Unable to find symbol for 0x%lx"), loc);
472 return orig_pc == pc ? 0 : pc & ~0x3;
475 libsym = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (stubsym), NULL, NULL);
478 warning (_("Unable to find library symbol for %s."),
479 SYMBOL_PRINT_NAME (stubsym));
480 return orig_pc == pc ? 0 : pc & ~0x3;
483 return SYMBOL_VALUE (libsym);
486 /* Does it look like bl X,%rp or bl X,%r0? Another way to do a
487 branch from the stub to the actual function. */
489 else if ((curr_inst & 0xffe0e000) == 0xe8400000
490 || (curr_inst & 0xffe0e000) == 0xe8000000
491 || (curr_inst & 0xffe0e000) == 0xe800A000)
492 return (loc + hppa_extract_17 (curr_inst) + 8) & ~0x3;
494 /* Does it look like bv (rp)? Note this depends on the
495 current stack pointer being the same as the stack
496 pointer in the stub itself! This is a branch on from the
497 stub back to the original caller. */
498 /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */
499 else if ((curr_inst & 0xffe0f000) == 0xe840c000)
501 /* Yup. See if the previous instruction loaded
503 if (prev_inst == 0x4bc23ff1)
506 sp = get_frame_register_unsigned (frame, HPPA_SP_REGNUM);
507 return read_memory_integer (sp - 8, 4) & ~0x3;
511 warning (_("Unable to find restore of %%rp before bv (%%rp)."));
512 return orig_pc == pc ? 0 : pc & ~0x3;
516 /* elz: added this case to capture the new instruction
517 at the end of the return part of an export stub used by
518 the PA2.0: BVE, n (rp) */
519 else if ((curr_inst & 0xffe0f000) == 0xe840d000)
521 return (read_memory_integer
522 (get_frame_register_unsigned (frame, HPPA_SP_REGNUM) - 24,
523 gdbarch_ptr_bit (gdbarch) / 8)) & ~0x3;
526 /* What about be,n 0(sr0,%rp)? It's just another way we return to
527 the original caller from the stub. Used in dynamic executables. */
528 else if (curr_inst == 0xe0400002)
530 /* The value we jump to is sitting in sp - 24. But that's
531 loaded several instructions before the be instruction.
532 I guess we could check for the previous instruction being
533 mtsp %r1,%sr0 if we want to do sanity checking. */
534 return (read_memory_integer
535 (get_frame_register_unsigned (frame, HPPA_SP_REGNUM) - 24,
536 gdbarch_ptr_bit (gdbarch) / 8)) & ~0x3;
539 /* Haven't found the branch yet, but we're still in the stub.
546 hppa_skip_permanent_breakpoint (struct regcache *regcache)
548 /* To step over a breakpoint instruction on the PA takes some
549 fiddling with the instruction address queue.
551 When we stop at a breakpoint, the IA queue front (the instruction
552 we're executing now) points at the breakpoint instruction, and
553 the IA queue back (the next instruction to execute) points to
554 whatever instruction we would execute after the breakpoint, if it
555 were an ordinary instruction. This is the case even if the
556 breakpoint is in the delay slot of a branch instruction.
558 Clearly, to step past the breakpoint, we need to set the queue
559 front to the back. But what do we put in the back? What
560 instruction comes after that one? Because of the branch delay
561 slot, the next insn is always at the back + 4. */
563 ULONGEST pcoq_tail, pcsq_tail;
564 regcache_cooked_read_unsigned (regcache, HPPA_PCOQ_TAIL_REGNUM, &pcoq_tail);
565 regcache_cooked_read_unsigned (regcache, HPPA_PCSQ_TAIL_REGNUM, &pcsq_tail);
567 regcache_cooked_write_unsigned (regcache, HPPA_PCOQ_HEAD_REGNUM, pcoq_tail);
568 regcache_cooked_write_unsigned (regcache, HPPA_PCSQ_HEAD_REGNUM, pcsq_tail);
570 regcache_cooked_write_unsigned (regcache, HPPA_PCOQ_TAIL_REGNUM, pcoq_tail + 4);
571 /* We can leave the tail's space the same, since there's no jump. */
576 struct hppa_hpux_sigtramp_unwind_cache
579 struct trad_frame_saved_reg *saved_regs;
582 static int hppa_hpux_tramp_reg[] = {
584 HPPA_PCOQ_HEAD_REGNUM,
585 HPPA_PCSQ_HEAD_REGNUM,
586 HPPA_PCOQ_TAIL_REGNUM,
587 HPPA_PCSQ_TAIL_REGNUM,
614 static struct hppa_hpux_sigtramp_unwind_cache *
615 hppa_hpux_sigtramp_frame_unwind_cache (struct frame_info *this_frame,
619 struct gdbarch *gdbarch = get_frame_arch (this_frame);
620 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
621 struct hppa_hpux_sigtramp_unwind_cache *info;
623 CORE_ADDR sp, scptr, off;
629 info = FRAME_OBSTACK_ZALLOC (struct hppa_hpux_sigtramp_unwind_cache);
631 info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
633 sp = get_frame_register_unsigned (this_frame, HPPA_SP_REGNUM);
635 if (IS_32BIT_TARGET (gdbarch))
642 /* See /usr/include/machine/save_state.h for the structure of the save_state_t
645 flag = read_memory_unsigned_integer(scptr + HPPA_HPUX_SS_FLAGS_OFFSET, 4);
647 if (!(flag & HPPA_HPUX_SS_WIDEREGS))
649 /* Narrow registers. */
650 off = scptr + HPPA_HPUX_SS_NARROW_OFFSET;
656 /* Wide registers. */
657 off = scptr + HPPA_HPUX_SS_WIDE_OFFSET + 8;
659 szoff = (tdep->bytes_per_address == 4 ? 4 : 0);
662 for (i = 1; i < 32; i++)
664 info->saved_regs[HPPA_R0_REGNUM + i].addr = off + szoff;
668 for (i = 0; i < ARRAY_SIZE (hppa_hpux_tramp_reg); i++)
670 if (hppa_hpux_tramp_reg[i] > 0)
671 info->saved_regs[hppa_hpux_tramp_reg[i]].addr = off + szoff;
678 info->base = get_frame_register_unsigned (this_frame, HPPA_SP_REGNUM);
684 hppa_hpux_sigtramp_frame_this_id (struct frame_info *this_frame,
685 void **this_prologue_cache,
686 struct frame_id *this_id)
688 struct hppa_hpux_sigtramp_unwind_cache *info
689 = hppa_hpux_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
691 *this_id = frame_id_build (info->base, get_frame_pc (this_frame));
694 static struct value *
695 hppa_hpux_sigtramp_frame_prev_register (struct frame_info *this_frame,
696 void **this_prologue_cache,
699 struct hppa_hpux_sigtramp_unwind_cache *info
700 = hppa_hpux_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
702 return hppa_frame_prev_register_helper (this_frame, info->saved_regs, regnum);
706 hppa_hpux_sigtramp_unwind_sniffer (const struct frame_unwind *self,
707 struct frame_info *this_frame,
710 struct unwind_table_entry *u;
711 CORE_ADDR pc = get_frame_pc (this_frame);
713 u = find_unwind_entry (pc);
715 /* If this is an export stub, try to get the unwind descriptor for
716 the actual function itself. */
717 if (u && u->stub_unwind.stub_type == EXPORT)
719 gdb_byte buf[HPPA_INSN_SIZE];
722 if (!safe_frame_unwind_memory (this_frame, u->region_start,
726 insn = extract_unsigned_integer (buf, sizeof buf);
727 if ((insn & 0xffe0e000) == 0xe8400000)
728 u = find_unwind_entry(u->region_start + hppa_extract_17 (insn) + 8);
731 if (u && u->HP_UX_interrupt_marker)
737 static const struct frame_unwind hppa_hpux_sigtramp_frame_unwind = {
739 hppa_hpux_sigtramp_frame_this_id,
740 hppa_hpux_sigtramp_frame_prev_register,
742 hppa_hpux_sigtramp_unwind_sniffer
746 hppa32_hpux_find_global_pointer (struct gdbarch *gdbarch,
747 struct value *function)
751 faddr = value_as_address (function);
753 /* Is this a plabel? If so, dereference it to get the gp value. */
761 status = target_read_memory (faddr + 4, buf, sizeof (buf));
763 return extract_unsigned_integer (buf, sizeof (buf));
766 return gdbarch_tdep (gdbarch)->solib_get_got_by_pc (faddr);
770 hppa64_hpux_find_global_pointer (struct gdbarch *gdbarch,
771 struct value *function)
776 faddr = value_as_address (function);
778 if (in_opd_section (faddr))
780 target_read_memory (faddr, buf, sizeof (buf));
781 return extract_unsigned_integer (&buf[24], 8);
785 return gdbarch_tdep (gdbarch)->solib_get_got_by_pc (faddr);
789 static unsigned int ldsid_pattern[] = {
790 0x000010a0, /* ldsid (rX),rY */
791 0x00001820, /* mtsp rY,sr0 */
792 0xe0000000 /* be,n (sr0,rX) */
796 hppa_hpux_search_pattern (CORE_ADDR start, CORE_ADDR end,
797 unsigned int *patterns, int count)
799 int num_insns = (end - start + HPPA_INSN_SIZE) / HPPA_INSN_SIZE;
804 buf = alloca (num_insns * HPPA_INSN_SIZE);
805 insns = alloca (num_insns * sizeof (unsigned int));
807 read_memory (start, buf, num_insns * HPPA_INSN_SIZE);
808 for (i = 0; i < num_insns; i++, buf += HPPA_INSN_SIZE)
809 insns[i] = extract_unsigned_integer (buf, HPPA_INSN_SIZE);
811 for (offset = 0; offset <= num_insns - count; offset++)
813 for (i = 0; i < count; i++)
815 if ((insns[offset + i] & patterns[i]) != patterns[i])
822 if (offset <= num_insns - count)
823 return start + offset * HPPA_INSN_SIZE;
829 hppa32_hpux_search_dummy_call_sequence (struct gdbarch *gdbarch, CORE_ADDR pc,
833 struct obj_section *sec;
834 struct hppa_objfile_private *priv;
835 struct frame_info *frame;
836 struct unwind_table_entry *u;
841 sec = find_pc_section (pc);
843 priv = objfile_data (obj, hppa_objfile_priv_data);
846 priv = hppa_init_objfile_priv_data (obj);
848 error (_("Internal error creating objfile private data."));
850 /* Use the cached value if we have one. */
851 if (priv->dummy_call_sequence_addr != 0)
853 *argreg = priv->dummy_call_sequence_reg;
854 return priv->dummy_call_sequence_addr;
857 /* First try a heuristic; if we are in a shared library call, our return
858 pointer is likely to point at an export stub. */
859 frame = get_current_frame ();
860 rp = frame_unwind_register_unsigned (frame, 2);
861 u = find_unwind_entry (rp);
862 if (u && u->stub_unwind.stub_type == EXPORT)
864 addr = hppa_hpux_search_pattern (u->region_start, u->region_end,
866 ARRAY_SIZE (ldsid_pattern));
871 /* Next thing to try is to look for an export stub. */
872 if (priv->unwind_info)
876 for (i = 0; i < priv->unwind_info->last; i++)
878 struct unwind_table_entry *u;
879 u = &priv->unwind_info->table[i];
880 if (u->stub_unwind.stub_type == EXPORT)
882 addr = hppa_hpux_search_pattern (u->region_start, u->region_end,
884 ARRAY_SIZE (ldsid_pattern));
893 /* Finally, if this is the main executable, try to locate a sequence
895 addr = hppa_symbol_address ("noshlibs");
896 sec = find_pc_section (addr);
898 if (sec && sec->objfile == obj)
900 CORE_ADDR start, end;
902 find_pc_partial_function (addr, NULL, &start, &end);
903 if (start != 0 && end != 0)
905 addr = hppa_hpux_search_pattern (start, end, ldsid_pattern,
906 ARRAY_SIZE (ldsid_pattern));
912 /* Can't find a suitable sequence. */
916 target_read_memory (addr, buf, sizeof (buf));
917 insn = extract_unsigned_integer (buf, sizeof (buf));
918 priv->dummy_call_sequence_addr = addr;
919 priv->dummy_call_sequence_reg = (insn >> 21) & 0x1f;
921 *argreg = priv->dummy_call_sequence_reg;
922 return priv->dummy_call_sequence_addr;
926 hppa64_hpux_search_dummy_call_sequence (struct gdbarch *gdbarch, CORE_ADDR pc,
930 struct obj_section *sec;
931 struct hppa_objfile_private *priv;
933 struct minimal_symbol *msym;
936 sec = find_pc_section (pc);
938 priv = objfile_data (obj, hppa_objfile_priv_data);
941 priv = hppa_init_objfile_priv_data (obj);
943 error (_("Internal error creating objfile private data."));
945 /* Use the cached value if we have one. */
946 if (priv->dummy_call_sequence_addr != 0)
948 *argreg = priv->dummy_call_sequence_reg;
949 return priv->dummy_call_sequence_addr;
952 /* FIXME: Without stub unwind information, locating a suitable sequence is
953 fairly difficult. For now, we implement a very naive and inefficient
954 scheme; try to read in blocks of code, and look for a "bve,n (rp)"
955 instruction. These are likely to occur at the end of functions, so
956 we only look at the last two instructions of each function. */
957 for (i = 0, msym = obj->msymbols; i < obj->minimal_symbol_count; i++, msym++)
959 CORE_ADDR begin, end;
961 gdb_byte buf[2 * HPPA_INSN_SIZE];
964 find_pc_partial_function (SYMBOL_VALUE_ADDRESS (msym), &name,
967 if (name == NULL || begin == 0 || end == 0)
970 if (target_read_memory (end - sizeof (buf), buf, sizeof (buf)) == 0)
972 for (offset = 0; offset < sizeof (buf); offset++)
976 insn = extract_unsigned_integer (buf + offset, HPPA_INSN_SIZE);
977 if (insn == 0xe840d002) /* bve,n (rp) */
979 addr = (end - sizeof (buf)) + offset;
986 /* Can't find a suitable sequence. */
990 priv->dummy_call_sequence_addr = addr;
991 /* Right now we only look for a "bve,l (rp)" sequence, so the register is
992 always HPPA_RP_REGNUM. */
993 priv->dummy_call_sequence_reg = HPPA_RP_REGNUM;
995 *argreg = priv->dummy_call_sequence_reg;
996 return priv->dummy_call_sequence_addr;
1000 hppa_hpux_find_import_stub_for_addr (CORE_ADDR funcaddr)
1002 struct objfile *objfile;
1003 struct minimal_symbol *funsym, *stubsym;
1006 funsym = lookup_minimal_symbol_by_pc (funcaddr);
1009 ALL_OBJFILES (objfile)
1011 stubsym = lookup_minimal_symbol_solib_trampoline
1012 (SYMBOL_LINKAGE_NAME (funsym), objfile);
1016 struct unwind_table_entry *u;
1018 u = find_unwind_entry (SYMBOL_VALUE (stubsym));
1020 || (u->stub_unwind.stub_type != IMPORT
1021 && u->stub_unwind.stub_type != IMPORT_SHLIB))
1024 stubaddr = SYMBOL_VALUE (stubsym);
1026 /* If we found an IMPORT stub, then we can stop searching;
1027 if we found an IMPORT_SHLIB, we want to continue the search
1028 in the hopes that we will find an IMPORT stub. */
1029 if (u->stub_unwind.stub_type == IMPORT)
1038 hppa_hpux_sr_for_addr (struct gdbarch *gdbarch, CORE_ADDR addr)
1041 /* The space register to use is encoded in the top 2 bits of the address. */
1042 sr = addr >> (gdbarch_tdep (gdbarch)->bytes_per_address * 8 - 2);
1047 hppa_hpux_find_dummy_bpaddr (CORE_ADDR addr)
1049 /* In order for us to restore the space register to its starting state,
1050 we need the dummy trampoline to return to the an instruction address in
1051 the same space as where we started the call. We used to place the
1052 breakpoint near the current pc, however, this breaks nested dummy calls
1053 as the nested call will hit the breakpoint address and terminate
1054 prematurely. Instead, we try to look for an address in the same space to
1057 This is similar in spirit to putting the breakpoint at the "entry point"
1058 of an executable. */
1060 struct obj_section *sec;
1061 struct unwind_table_entry *u;
1062 struct minimal_symbol *msym;
1066 sec = find_pc_section (addr);
1069 /* First try the lowest address in the section; we can use it as long
1070 as it is "regular" code (i.e. not a stub) */
1071 u = find_unwind_entry (obj_section_addr (sec));
1072 if (!u || u->stub_unwind.stub_type == 0)
1073 return obj_section_addr (sec);
1075 /* Otherwise, we need to find a symbol for a regular function. We
1076 do this by walking the list of msymbols in the objfile. The symbol
1077 we find should not be the same as the function that was passed in. */
1079 /* FIXME: this is broken, because we can find a function that will be
1080 called by the dummy call target function, which will still not
1083 find_pc_partial_function (addr, NULL, &func, NULL);
1084 for (i = 0, msym = sec->objfile->msymbols;
1085 i < sec->objfile->minimal_symbol_count;
1088 u = find_unwind_entry (SYMBOL_VALUE_ADDRESS (msym));
1089 if (func != SYMBOL_VALUE_ADDRESS (msym)
1090 && (!u || u->stub_unwind.stub_type == 0))
1091 return SYMBOL_VALUE_ADDRESS (msym);
1095 warning (_("Cannot find suitable address to place dummy breakpoint; nested "
1096 "calls may fail."));
1101 hppa_hpux_push_dummy_code (struct gdbarch *gdbarch, CORE_ADDR sp,
1103 struct value **args, int nargs,
1104 struct type *value_type,
1105 CORE_ADDR *real_pc, CORE_ADDR *bp_addr,
1106 struct regcache *regcache)
1108 CORE_ADDR pc, stubaddr;
1113 /* Note: we don't want to pass a function descriptor here; push_dummy_call
1114 fills in the PIC register for us. */
1115 funcaddr = gdbarch_convert_from_func_ptr_addr (gdbarch, funcaddr, NULL);
1117 /* The simple case is where we call a function in the same space that we are
1118 currently in; in that case we don't really need to do anything. */
1119 if (hppa_hpux_sr_for_addr (gdbarch, pc)
1120 == hppa_hpux_sr_for_addr (gdbarch, funcaddr))
1122 /* Intraspace call. */
1123 *bp_addr = hppa_hpux_find_dummy_bpaddr (pc);
1124 *real_pc = funcaddr;
1125 regcache_cooked_write_unsigned (regcache, HPPA_RP_REGNUM, *bp_addr);
1130 /* In order to make an interspace call, we need to go through a stub.
1131 gcc supplies an appropriate stub called "__gcc_plt_call", however, if
1132 an application is compiled with HP compilers then this stub is not
1133 available. We used to fallback to "__d_plt_call", however that stub
1134 is not entirely useful for us because it doesn't do an interspace
1135 return back to the caller. Also, on hppa64-hpux, there is no
1136 __gcc_plt_call available. In order to keep the code uniform, we
1137 instead don't use either of these stubs, but instead write our own
1140 A problem arises since the stack is located in a different space than
1141 code, so in order to branch to a stack stub, we will need to do an
1142 interspace branch. Previous versions of gdb did this by modifying code
1143 at the current pc and doing single-stepping to set the pcsq. Since this
1144 is highly undesirable, we use a different scheme:
1146 All we really need to do the branch to the stub is a short instruction
1157 Instead of writing these sequences ourselves, we can find it in
1158 the instruction stream that belongs to the current space. While this
1159 seems difficult at first, we are actually guaranteed to find the sequences
1163 - in export stubs for shared libraries
1164 - in the "noshlibs" routine in the main module
1167 - at the end of each "regular" function
1169 We cache the address of these sequences in the objfile's private data
1170 since these operations can potentially be quite expensive.
1173 - write a stack trampoline
1174 - look for a suitable instruction sequence in the current space
1175 - point the sequence at the trampoline
1176 - set the return address of the trampoline to the current space
1177 (see hppa_hpux_find_dummy_call_bpaddr)
1178 - set the continuing address of the "dummy code" as the sequence.
1182 if (IS_32BIT_TARGET (gdbarch))
1184 static unsigned int hppa32_tramp[] = {
1185 0x0fdf1291, /* stw r31,-8(,sp) */
1186 0x02c010a1, /* ldsid (,r22),r1 */
1187 0x00011820, /* mtsp r1,sr0 */
1188 0xe6c00000, /* be,l 0(sr0,r22),%sr0,%r31 */
1189 0x081f0242, /* copy r31,rp */
1190 0x0fd11082, /* ldw -8(,sp),rp */
1191 0x004010a1, /* ldsid (,rp),r1 */
1192 0x00011820, /* mtsp r1,sr0 */
1193 0xe0400000, /* be 0(sr0,rp) */
1194 0x08000240 /* nop */
1197 /* for hppa32, we must call the function through a stub so that on
1198 return it can return to the space of our trampoline. */
1199 stubaddr = hppa_hpux_find_import_stub_for_addr (funcaddr);
1201 error (_("Cannot call external function not referenced by application "
1202 "(no import stub).\n"));
1203 regcache_cooked_write_unsigned (regcache, 22, stubaddr);
1205 write_memory (sp, (char *)&hppa32_tramp, sizeof (hppa32_tramp));
1207 *bp_addr = hppa_hpux_find_dummy_bpaddr (pc);
1208 regcache_cooked_write_unsigned (regcache, 31, *bp_addr);
1210 *real_pc = hppa32_hpux_search_dummy_call_sequence (gdbarch, pc, &argreg);
1212 error (_("Cannot make interspace call from here."));
1214 regcache_cooked_write_unsigned (regcache, argreg, sp);
1216 sp += sizeof (hppa32_tramp);
1220 static unsigned int hppa64_tramp[] = {
1221 0xeac0f000, /* bve,l (r22),%r2 */
1222 0x0fdf12d1, /* std r31,-8(,sp) */
1223 0x0fd110c2, /* ldd -8(,sp),rp */
1224 0xe840d002, /* bve,n (rp) */
1225 0x08000240 /* nop */
1228 /* for hppa64, we don't need to call through a stub; all functions
1229 return via a bve. */
1230 regcache_cooked_write_unsigned (regcache, 22, funcaddr);
1231 write_memory (sp, (char *)&hppa64_tramp, sizeof (hppa64_tramp));
1234 regcache_cooked_write_unsigned (regcache, 31, *bp_addr);
1236 *real_pc = hppa64_hpux_search_dummy_call_sequence (gdbarch, pc, &argreg);
1238 error (_("Cannot make interspace call from here."));
1240 regcache_cooked_write_unsigned (regcache, argreg, sp);
1242 sp += sizeof (hppa64_tramp);
1245 sp = gdbarch_frame_align (gdbarch, sp);
1253 hppa_hpux_supply_ss_narrow (struct regcache *regcache,
1254 int regnum, const char *save_state)
1256 const char *ss_narrow = save_state + HPPA_HPUX_SS_NARROW_OFFSET;
1259 for (i = HPPA_R1_REGNUM; i < HPPA_FP0_REGNUM; i++)
1261 if (regnum == i || regnum == -1)
1262 regcache_raw_supply (regcache, i, ss_narrow + offset);
1269 hppa_hpux_supply_ss_fpblock (struct regcache *regcache,
1270 int regnum, const char *save_state)
1272 const char *ss_fpblock = save_state + HPPA_HPUX_SS_FPBLOCK_OFFSET;
1275 /* FIXME: We view the floating-point state as 64 single-precision
1276 registers for 32-bit code, and 32 double-precision register for
1277 64-bit code. This distinction is artificial and should be
1278 eliminated. If that ever happens, we should remove the if-clause
1281 if (register_size (get_regcache_arch (regcache), HPPA_FP0_REGNUM) == 4)
1283 for (i = HPPA_FP0_REGNUM; i < HPPA_FP0_REGNUM + 64; i++)
1285 if (regnum == i || regnum == -1)
1286 regcache_raw_supply (regcache, i, ss_fpblock + offset);
1293 for (i = HPPA_FP0_REGNUM; i < HPPA_FP0_REGNUM + 32; i++)
1295 if (regnum == i || regnum == -1)
1296 regcache_raw_supply (regcache, i, ss_fpblock + offset);
1304 hppa_hpux_supply_ss_wide (struct regcache *regcache,
1305 int regnum, const char *save_state)
1307 const char *ss_wide = save_state + HPPA_HPUX_SS_WIDE_OFFSET;
1310 if (register_size (get_regcache_arch (regcache), HPPA_R1_REGNUM) == 4)
1313 for (i = HPPA_R1_REGNUM; i < HPPA_FP0_REGNUM; i++)
1315 if (regnum == i || regnum == -1)
1316 regcache_raw_supply (regcache, i, ss_wide + offset);
1323 hppa_hpux_supply_save_state (const struct regset *regset,
1324 struct regcache *regcache,
1325 int regnum, const void *regs, size_t len)
1327 const char *proc_info = regs;
1328 const char *save_state = proc_info + 8;
1331 flags = extract_unsigned_integer (save_state + HPPA_HPUX_SS_FLAGS_OFFSET, 4);
1332 if (regnum == -1 || regnum == HPPA_FLAGS_REGNUM)
1334 struct gdbarch *arch = get_regcache_arch (regcache);
1335 size_t size = register_size (arch, HPPA_FLAGS_REGNUM);
1338 store_unsigned_integer (buf, size, flags);
1339 regcache_raw_supply (regcache, HPPA_FLAGS_REGNUM, buf);
1342 /* If the SS_WIDEREGS flag is set, we really do need the full
1343 `struct save_state'. */
1344 if (flags & HPPA_HPUX_SS_WIDEREGS && len < HPPA_HPUX_SAVE_STATE_SIZE)
1345 error (_("Register set contents too small"));
1347 if (flags & HPPA_HPUX_SS_WIDEREGS)
1348 hppa_hpux_supply_ss_wide (regcache, regnum, save_state);
1350 hppa_hpux_supply_ss_narrow (regcache, regnum, save_state);
1352 hppa_hpux_supply_ss_fpblock (regcache, regnum, save_state);
1355 /* HP-UX register set. */
1357 static struct regset hppa_hpux_regset =
1360 hppa_hpux_supply_save_state
1363 static const struct regset *
1364 hppa_hpux_regset_from_core_section (struct gdbarch *gdbarch,
1365 const char *sect_name, size_t sect_size)
1367 if (strcmp (sect_name, ".reg") == 0
1368 && sect_size >= HPPA_HPUX_PA89_SAVE_STATE_SIZE + 8)
1369 return &hppa_hpux_regset;
1375 /* Bit in the `ss_flag' member of `struct save_state' that indicates
1376 the state was saved from a system call. From
1377 <machine/save_state.h>. */
1378 #define HPPA_HPUX_SS_INSYSCALL 0x02
1381 hppa_hpux_read_pc (struct regcache *regcache)
1385 /* If we're currently in a system call return the contents of %r31. */
1386 regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags);
1387 if (flags & HPPA_HPUX_SS_INSYSCALL)
1390 regcache_cooked_read_unsigned (regcache, HPPA_R31_REGNUM, &pc);
1394 return hppa_read_pc (regcache);
1398 hppa_hpux_write_pc (struct regcache *regcache, CORE_ADDR pc)
1402 /* If we're currently in a system call also write PC into %r31. */
1403 regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags);
1404 if (flags & HPPA_HPUX_SS_INSYSCALL)
1405 regcache_cooked_write_unsigned (regcache, HPPA_R31_REGNUM, pc | 0x3);
1407 return hppa_write_pc (regcache, pc);
1411 hppa_hpux_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
1415 /* If we're currently in a system call return the contents of %r31. */
1416 flags = frame_unwind_register_unsigned (next_frame, HPPA_FLAGS_REGNUM);
1417 if (flags & HPPA_HPUX_SS_INSYSCALL)
1418 return frame_unwind_register_unsigned (next_frame, HPPA_R31_REGNUM) & ~0x3;
1420 return hppa_unwind_pc (gdbarch, next_frame);
1424 /* Given the current value of the pc, check to see if it is inside a stub, and
1425 if so, change the value of the pc to point to the caller of the stub.
1426 THIS_FRAME is the current frame in the current list of frames.
1427 BASE contains to stack frame base of the current frame.
1428 SAVE_REGS is the register file stored in the frame cache. */
1430 hppa_hpux_unwind_adjust_stub (struct frame_info *this_frame, CORE_ADDR base,
1431 struct trad_frame_saved_reg *saved_regs)
1433 struct gdbarch *gdbarch = get_frame_arch (this_frame);
1434 struct value *pcoq_head_val;
1437 struct unwind_table_entry *u;
1439 pcoq_head_val = trad_frame_get_prev_register (this_frame, saved_regs,
1440 HPPA_PCOQ_HEAD_REGNUM);
1442 extract_unsigned_integer (value_contents_all (pcoq_head_val),
1443 register_size (gdbarch, HPPA_PCOQ_HEAD_REGNUM));
1445 u = find_unwind_entry (pcoq_head);
1446 if (u && u->stub_unwind.stub_type == EXPORT)
1448 stubpc = read_memory_integer (base - 24, gdbarch_ptr_bit (gdbarch) / 8);
1449 trad_frame_set_value (saved_regs, HPPA_PCOQ_HEAD_REGNUM, stubpc);
1451 else if (hppa_symbol_address ("__gcc_plt_call")
1452 == get_pc_function_start (pcoq_head))
1454 stubpc = read_memory_integer
1455 (base - 8, gdbarch_ptr_bit (gdbarch) / 8);
1456 trad_frame_set_value (saved_regs, HPPA_PCOQ_HEAD_REGNUM, stubpc);
1461 hppa_hpux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
1463 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1465 if (IS_32BIT_TARGET (gdbarch))
1466 tdep->in_solib_call_trampoline = hppa32_hpux_in_solib_call_trampoline;
1468 tdep->in_solib_call_trampoline = hppa64_hpux_in_solib_call_trampoline;
1470 tdep->unwind_adjust_stub = hppa_hpux_unwind_adjust_stub;
1472 set_gdbarch_in_solib_return_trampoline
1473 (gdbarch, hppa_hpux_in_solib_return_trampoline);
1474 set_gdbarch_skip_trampoline_code (gdbarch, hppa_hpux_skip_trampoline_code);
1476 set_gdbarch_push_dummy_code (gdbarch, hppa_hpux_push_dummy_code);
1477 set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
1479 set_gdbarch_read_pc (gdbarch, hppa_hpux_read_pc);
1480 set_gdbarch_write_pc (gdbarch, hppa_hpux_write_pc);
1481 set_gdbarch_unwind_pc (gdbarch, hppa_hpux_unwind_pc);
1482 set_gdbarch_skip_permanent_breakpoint
1483 (gdbarch, hppa_skip_permanent_breakpoint);
1485 set_gdbarch_regset_from_core_section
1486 (gdbarch, hppa_hpux_regset_from_core_section);
1488 frame_unwind_append_unwinder (gdbarch, &hppa_hpux_sigtramp_frame_unwind);
1492 hppa_hpux_som_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
1494 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1498 tdep->find_global_pointer = hppa32_hpux_find_global_pointer;
1500 hppa_hpux_init_abi (info, gdbarch);
1501 som_solib_select (gdbarch);
1505 hppa_hpux_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
1507 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1510 tdep->find_global_pointer = hppa64_hpux_find_global_pointer;
1512 hppa_hpux_init_abi (info, gdbarch);
1513 pa64_solib_select (gdbarch);
1516 static enum gdb_osabi
1517 hppa_hpux_core_osabi_sniffer (bfd *abfd)
1519 if (strcmp (bfd_get_target (abfd), "hpux-core") == 0)
1520 return GDB_OSABI_HPUX_SOM;
1521 else if (strcmp (bfd_get_target (abfd), "elf64-hppa") == 0)
1525 section = bfd_get_section_by_name (abfd, ".kernel");
1531 size = bfd_section_size (abfd, section);
1532 contents = alloca (size);
1533 if (bfd_get_section_contents (abfd, section, contents,
1535 && strcmp (contents, "HP-UX") == 0)
1536 return GDB_OSABI_HPUX_ELF;
1540 return GDB_OSABI_UNKNOWN;
1544 _initialize_hppa_hpux_tdep (void)
1546 /* BFD doesn't set a flavour for HP-UX style core files. It doesn't
1547 set the architecture either. */
1548 gdbarch_register_osabi_sniffer (bfd_arch_unknown,
1549 bfd_target_unknown_flavour,
1550 hppa_hpux_core_osabi_sniffer);
1551 gdbarch_register_osabi_sniffer (bfd_arch_hppa,
1552 bfd_target_elf_flavour,
1553 hppa_hpux_core_osabi_sniffer);
1555 gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_HPUX_SOM,
1556 hppa_hpux_som_init_abi);
1557 gdbarch_register_osabi (bfd_arch_hppa, bfd_mach_hppa20w, GDB_OSABI_HPUX_ELF,
1558 hppa_hpux_elf_init_abi);