1 /* Target-dependent code for HP-UX on PA-RISC.
3 Copyright 2002, 2003, 2004 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 2 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, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 #include "arch-utils.h"
26 #include "gdb_string.h"
28 #include "frame-unwind.h"
29 #include "trad-frame.h"
35 #include "hppa-tdep.h"
38 #include <machine/save_state.h>
41 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
44 /* Forward declarations. */
45 extern void _initialize_hppa_hpux_tdep (void);
46 extern initialize_file_ftype _initialize_hppa_hpux_tdep
;
50 struct minimal_symbol
*msym
;
51 CORE_ADDR solib_handle
;
56 /* Return one if PC is in the call path of a trampoline, else return zero.
58 Note we return one for *any* call trampoline (long-call, arg-reloc), not
59 just shared library trampolines (import, export). */
62 hppa32_hpux_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
64 struct minimal_symbol
*minsym
;
65 struct unwind_table_entry
*u
;
67 /* First see if PC is in one of the two C-library trampolines. */
68 if (pc
== hppa_symbol_address("$$dyncall")
69 || pc
== hppa_symbol_address("_sr4export"))
72 minsym
= lookup_minimal_symbol_by_pc (pc
);
73 if (minsym
&& strcmp (DEPRECATED_SYMBOL_NAME (minsym
), ".stub") == 0)
76 /* Get the unwind descriptor corresponding to PC, return zero
77 if no unwind was found. */
78 u
= find_unwind_entry (pc
);
82 /* If this isn't a linker stub, then return now. */
83 if (u
->stub_unwind
.stub_type
== 0)
86 /* By definition a long-branch stub is a call stub. */
87 if (u
->stub_unwind
.stub_type
== LONG_BRANCH
)
90 /* The call and return path execute the same instructions within
91 an IMPORT stub! So an IMPORT stub is both a call and return
93 if (u
->stub_unwind
.stub_type
== IMPORT
)
96 /* Parameter relocation stubs always have a call path and may have a
98 if (u
->stub_unwind
.stub_type
== PARAMETER_RELOCATION
99 || u
->stub_unwind
.stub_type
== EXPORT
)
103 /* Search forward from the current PC until we hit a branch
104 or the end of the stub. */
105 for (addr
= pc
; addr
<= u
->region_end
; addr
+= 4)
109 insn
= read_memory_integer (addr
, 4);
111 /* Does it look like a bl? If so then it's the call path, if
112 we find a bv or be first, then we're on the return path. */
113 if ((insn
& 0xfc00e000) == 0xe8000000)
115 else if ((insn
& 0xfc00e001) == 0xe800c000
116 || (insn
& 0xfc000000) == 0xe0000000)
120 /* Should never happen. */
121 warning ("Unable to find branch in parameter relocation stub.\n");
125 /* Unknown stub type. For now, just return zero. */
130 hppa64_hpux_in_solib_call_trampoline (CORE_ADDR pc
, char *name
)
132 /* PA64 has a completely different stub/trampoline scheme. Is it
133 better? Maybe. It's certainly harder to determine with any
134 certainty that we are in a stub because we can not refer to the
137 The heuristic is simple. Try to lookup the current PC value in th
138 minimal symbol table. If that fails, then assume we are not in a
141 Then see if the PC value falls within the section bounds for the
142 section containing the minimal symbol we found in the first
143 step. If it does, then assume we are not in a stub and return.
145 Finally peek at the instructions to see if they look like a stub. */
146 struct minimal_symbol
*minsym
;
151 minsym
= lookup_minimal_symbol_by_pc (pc
);
155 sec
= SYMBOL_BFD_SECTION (minsym
);
157 if (bfd_get_section_vma (sec
->owner
, sec
) <= pc
158 && pc
< (bfd_get_section_vma (sec
->owner
, sec
)
159 + bfd_section_size (sec
->owner
, sec
)))
162 /* We might be in a stub. Peek at the instructions. Stubs are 3
163 instructions long. */
164 insn
= read_memory_integer (pc
, 4);
166 /* Find out where we think we are within the stub. */
167 if ((insn
& 0xffffc00e) == 0x53610000)
169 else if ((insn
& 0xffffffff) == 0xe820d000)
171 else if ((insn
& 0xffffc00e) == 0x537b0000)
176 /* Now verify each insn in the range looks like a stub instruction. */
177 insn
= read_memory_integer (addr
, 4);
178 if ((insn
& 0xffffc00e) != 0x53610000)
181 /* Now verify each insn in the range looks like a stub instruction. */
182 insn
= read_memory_integer (addr
+ 4, 4);
183 if ((insn
& 0xffffffff) != 0xe820d000)
186 /* Now verify each insn in the range looks like a stub instruction. */
187 insn
= read_memory_integer (addr
+ 8, 4);
188 if ((insn
& 0xffffc00e) != 0x537b0000)
191 /* Looks like a stub. */
195 /* Return one if PC is in the return path of a trampoline, else return zero.
197 Note we return one for *any* call trampoline (long-call, arg-reloc), not
198 just shared library trampolines (import, export). */
201 hppa_hpux_in_solib_return_trampoline (CORE_ADDR pc
, char *name
)
203 struct unwind_table_entry
*u
;
205 /* Get the unwind descriptor corresponding to PC, return zero
206 if no unwind was found. */
207 u
= find_unwind_entry (pc
);
211 /* If this isn't a linker stub or it's just a long branch stub, then
213 if (u
->stub_unwind
.stub_type
== 0 || u
->stub_unwind
.stub_type
== LONG_BRANCH
)
216 /* The call and return path execute the same instructions within
217 an IMPORT stub! So an IMPORT stub is both a call and return
219 if (u
->stub_unwind
.stub_type
== IMPORT
)
222 /* Parameter relocation stubs always have a call path and may have a
224 if (u
->stub_unwind
.stub_type
== PARAMETER_RELOCATION
225 || u
->stub_unwind
.stub_type
== EXPORT
)
229 /* Search forward from the current PC until we hit a branch
230 or the end of the stub. */
231 for (addr
= pc
; addr
<= u
->region_end
; addr
+= 4)
235 insn
= read_memory_integer (addr
, 4);
237 /* Does it look like a bl? If so then it's the call path, if
238 we find a bv or be first, then we're on the return path. */
239 if ((insn
& 0xfc00e000) == 0xe8000000)
241 else if ((insn
& 0xfc00e001) == 0xe800c000
242 || (insn
& 0xfc000000) == 0xe0000000)
246 /* Should never happen. */
247 warning ("Unable to find branch in parameter relocation stub.\n");
251 /* Unknown stub type. For now, just return zero. */
256 /* Figure out if PC is in a trampoline, and if so find out where
257 the trampoline will jump to. If not in a trampoline, return zero.
259 Simple code examination probably is not a good idea since the code
260 sequences in trampolines can also appear in user code.
262 We use unwinds and information from the minimal symbol table to
263 determine when we're in a trampoline. This won't work for ELF
264 (yet) since it doesn't create stub unwind entries. Whether or
265 not ELF will create stub unwinds or normal unwinds for linker
266 stubs is still being debated.
268 This should handle simple calls through dyncall or sr4export,
269 long calls, argument relocation stubs, and dyncall/sr4export
270 calling an argument relocation stub. It even handles some stubs
271 used in dynamic executables. */
274 hppa_hpux_skip_trampoline_code (CORE_ADDR pc
)
277 long prev_inst
, curr_inst
, loc
;
278 struct minimal_symbol
*msym
;
279 struct unwind_table_entry
*u
;
281 /* Addresses passed to dyncall may *NOT* be the actual address
282 of the function. So we may have to do something special. */
283 if (pc
== hppa_symbol_address("$$dyncall"))
285 pc
= (CORE_ADDR
) read_register (22);
287 /* If bit 30 (counting from the left) is on, then pc is the address of
288 the PLT entry for this function, not the address of the function
289 itself. Bit 31 has meaning too, but only for MPE. */
291 pc
= (CORE_ADDR
) read_memory_integer (pc
& ~0x3, TARGET_PTR_BIT
/ 8);
293 if (pc
== hppa_symbol_address("$$dyncall_external"))
295 pc
= (CORE_ADDR
) read_register (22);
296 pc
= (CORE_ADDR
) read_memory_integer (pc
& ~0x3, TARGET_PTR_BIT
/ 8);
298 else if (pc
== hppa_symbol_address("_sr4export"))
299 pc
= (CORE_ADDR
) (read_register (22));
301 /* Get the unwind descriptor corresponding to PC, return zero
302 if no unwind was found. */
303 u
= find_unwind_entry (pc
);
307 /* If this isn't a linker stub, then return now. */
308 /* elz: attention here! (FIXME) because of a compiler/linker
309 error, some stubs which should have a non zero stub_unwind.stub_type
310 have unfortunately a value of zero. So this function would return here
311 as if we were not in a trampoline. To fix this, we go look at the partial
312 symbol information, which reports this guy as a stub.
313 (FIXME): Unfortunately, we are not that lucky: it turns out that the
314 partial symbol information is also wrong sometimes. This is because
315 when it is entered (somread.c::som_symtab_read()) it can happen that
316 if the type of the symbol (from the som) is Entry, and the symbol is
317 in a shared library, then it can also be a trampoline. This would
318 be OK, except that I believe the way they decide if we are ina shared library
319 does not work. SOOOO..., even if we have a regular function w/o trampolines
320 its minimal symbol can be assigned type mst_solib_trampoline.
321 Also, if we find that the symbol is a real stub, then we fix the unwind
322 descriptor, and define the stub type to be EXPORT.
323 Hopefully this is correct most of the times. */
324 if (u
->stub_unwind
.stub_type
== 0)
327 /* elz: NOTE (FIXME!) once the problem with the unwind information is fixed
328 we can delete all the code which appears between the lines */
329 /*--------------------------------------------------------------------------*/
330 msym
= lookup_minimal_symbol_by_pc (pc
);
332 if (msym
== NULL
|| MSYMBOL_TYPE (msym
) != mst_solib_trampoline
)
333 return orig_pc
== pc
? 0 : pc
& ~0x3;
335 else if (msym
!= NULL
&& MSYMBOL_TYPE (msym
) == mst_solib_trampoline
)
337 struct objfile
*objfile
;
338 struct minimal_symbol
*msymbol
;
339 int function_found
= 0;
341 /* go look if there is another minimal symbol with the same name as
342 this one, but with type mst_text. This would happen if the msym
343 is an actual trampoline, in which case there would be another
344 symbol with the same name corresponding to the real function */
346 ALL_MSYMBOLS (objfile
, msymbol
)
348 if (MSYMBOL_TYPE (msymbol
) == mst_text
349 && DEPRECATED_STREQ (DEPRECATED_SYMBOL_NAME (msymbol
), DEPRECATED_SYMBOL_NAME (msym
)))
357 /* the type of msym is correct (mst_solib_trampoline), but
358 the unwind info is wrong, so set it to the correct value */
359 u
->stub_unwind
.stub_type
= EXPORT
;
361 /* the stub type info in the unwind is correct (this is not a
362 trampoline), but the msym type information is wrong, it
363 should be mst_text. So we need to fix the msym, and also
364 get out of this function */
366 MSYMBOL_TYPE (msym
) = mst_text
;
367 return orig_pc
== pc
? 0 : pc
& ~0x3;
371 /*--------------------------------------------------------------------------*/
374 /* It's a stub. Search for a branch and figure out where it goes.
375 Note we have to handle multi insn branch sequences like ldil;ble.
376 Most (all?) other branches can be determined by examining the contents
377 of certain registers and the stack. */
384 /* Make sure we haven't walked outside the range of this stub. */
385 if (u
!= find_unwind_entry (loc
))
387 warning ("Unable to find branch in linker stub");
388 return orig_pc
== pc
? 0 : pc
& ~0x3;
391 prev_inst
= curr_inst
;
392 curr_inst
= read_memory_integer (loc
, 4);
394 /* Does it look like a branch external using %r1? Then it's the
395 branch from the stub to the actual function. */
396 if ((curr_inst
& 0xffe0e000) == 0xe0202000)
398 /* Yup. See if the previous instruction loaded
399 a value into %r1. If so compute and return the jump address. */
400 if ((prev_inst
& 0xffe00000) == 0x20200000)
401 return (hppa_extract_21 (prev_inst
) + hppa_extract_17 (curr_inst
)) & ~0x3;
404 warning ("Unable to find ldil X,%%r1 before ble Y(%%sr4,%%r1).");
405 return orig_pc
== pc
? 0 : pc
& ~0x3;
409 /* Does it look like a be 0(sr0,%r21)? OR
410 Does it look like a be, n 0(sr0,%r21)? OR
411 Does it look like a bve (r21)? (this is on PA2.0)
412 Does it look like a bve, n(r21)? (this is also on PA2.0)
413 That's the branch from an
414 import stub to an export stub.
416 It is impossible to determine the target of the branch via
417 simple examination of instructions and/or data (consider
418 that the address in the plabel may be the address of the
419 bind-on-reference routine in the dynamic loader).
421 So we have try an alternative approach.
423 Get the name of the symbol at our current location; it should
424 be a stub symbol with the same name as the symbol in the
427 Then lookup a minimal symbol with the same name; we should
428 get the minimal symbol for the target routine in the shared
429 library as those take precedence of import/export stubs. */
430 if ((curr_inst
== 0xe2a00000) ||
431 (curr_inst
== 0xe2a00002) ||
432 (curr_inst
== 0xeaa0d000) ||
433 (curr_inst
== 0xeaa0d002))
435 struct minimal_symbol
*stubsym
, *libsym
;
437 stubsym
= lookup_minimal_symbol_by_pc (loc
);
440 warning ("Unable to find symbol for 0x%lx", loc
);
441 return orig_pc
== pc
? 0 : pc
& ~0x3;
444 libsym
= lookup_minimal_symbol (DEPRECATED_SYMBOL_NAME (stubsym
), NULL
, NULL
);
447 warning ("Unable to find library symbol for %s\n",
448 DEPRECATED_SYMBOL_NAME (stubsym
));
449 return orig_pc
== pc
? 0 : pc
& ~0x3;
452 return SYMBOL_VALUE (libsym
);
455 /* Does it look like bl X,%rp or bl X,%r0? Another way to do a
456 branch from the stub to the actual function. */
458 else if ((curr_inst
& 0xffe0e000) == 0xe8400000
459 || (curr_inst
& 0xffe0e000) == 0xe8000000
460 || (curr_inst
& 0xffe0e000) == 0xe800A000)
461 return (loc
+ hppa_extract_17 (curr_inst
) + 8) & ~0x3;
463 /* Does it look like bv (rp)? Note this depends on the
464 current stack pointer being the same as the stack
465 pointer in the stub itself! This is a branch on from the
466 stub back to the original caller. */
467 /*else if ((curr_inst & 0xffe0e000) == 0xe840c000) */
468 else if ((curr_inst
& 0xffe0f000) == 0xe840c000)
470 /* Yup. See if the previous instruction loaded
472 if (prev_inst
== 0x4bc23ff1)
473 return (read_memory_integer
474 (read_register (HPPA_SP_REGNUM
) - 8, 4)) & ~0x3;
477 warning ("Unable to find restore of %%rp before bv (%%rp).");
478 return orig_pc
== pc
? 0 : pc
& ~0x3;
482 /* elz: added this case to capture the new instruction
483 at the end of the return part of an export stub used by
484 the PA2.0: BVE, n (rp) */
485 else if ((curr_inst
& 0xffe0f000) == 0xe840d000)
487 return (read_memory_integer
488 (read_register (HPPA_SP_REGNUM
) - 24, TARGET_PTR_BIT
/ 8)) & ~0x3;
491 /* What about be,n 0(sr0,%rp)? It's just another way we return to
492 the original caller from the stub. Used in dynamic executables. */
493 else if (curr_inst
== 0xe0400002)
495 /* The value we jump to is sitting in sp - 24. But that's
496 loaded several instructions before the be instruction.
497 I guess we could check for the previous instruction being
498 mtsp %r1,%sr0 if we want to do sanity checking. */
499 return (read_memory_integer
500 (read_register (HPPA_SP_REGNUM
) - 24, TARGET_PTR_BIT
/ 8)) & ~0x3;
503 /* Haven't found the branch yet, but we're still in the stub.
510 hppa_skip_permanent_breakpoint (void)
512 /* To step over a breakpoint instruction on the PA takes some
513 fiddling with the instruction address queue.
515 When we stop at a breakpoint, the IA queue front (the instruction
516 we're executing now) points at the breakpoint instruction, and
517 the IA queue back (the next instruction to execute) points to
518 whatever instruction we would execute after the breakpoint, if it
519 were an ordinary instruction. This is the case even if the
520 breakpoint is in the delay slot of a branch instruction.
522 Clearly, to step past the breakpoint, we need to set the queue
523 front to the back. But what do we put in the back? What
524 instruction comes after that one? Because of the branch delay
525 slot, the next insn is always at the back + 4. */
526 write_register (HPPA_PCOQ_HEAD_REGNUM
, read_register (HPPA_PCOQ_TAIL_REGNUM
));
527 write_register (HPPA_PCSQ_HEAD_REGNUM
, read_register (HPPA_PCSQ_TAIL_REGNUM
));
529 write_register (HPPA_PCOQ_TAIL_REGNUM
, read_register (HPPA_PCOQ_TAIL_REGNUM
) + 4);
530 /* We can leave the tail's space the same, since there's no jump. */
533 /* Exception handling support for the HP-UX ANSI C++ compiler.
534 The compiler (aCC) provides a callback for exception events;
535 GDB can set a breakpoint on this callback and find out what
536 exception event has occurred. */
538 /* The name of the hook to be set to point to the callback function */
539 static char HP_ACC_EH_notify_hook
[] = "__eh_notify_hook";
540 /* The name of the function to be used to set the hook value */
541 static char HP_ACC_EH_set_hook_value
[] = "__eh_set_hook_value";
542 /* The name of the callback function in end.o */
543 static char HP_ACC_EH_notify_callback
[] = "__d_eh_notify_callback";
544 /* Name of function in end.o on which a break is set (called by above) */
545 static char HP_ACC_EH_break
[] = "__d_eh_break";
546 /* Name of flag (in end.o) that enables catching throws */
547 static char HP_ACC_EH_catch_throw
[] = "__d_eh_catch_throw";
548 /* Name of flag (in end.o) that enables catching catching */
549 static char HP_ACC_EH_catch_catch
[] = "__d_eh_catch_catch";
550 /* The enum used by aCC */
558 /* Is exception-handling support available with this executable? */
559 static int hp_cxx_exception_support
= 0;
560 /* Has the initialize function been run? */
561 static int hp_cxx_exception_support_initialized
= 0;
562 /* Address of __eh_notify_hook */
563 static CORE_ADDR eh_notify_hook_addr
= 0;
564 /* Address of __d_eh_notify_callback */
565 static CORE_ADDR eh_notify_callback_addr
= 0;
566 /* Address of __d_eh_break */
567 static CORE_ADDR eh_break_addr
= 0;
568 /* Address of __d_eh_catch_catch */
569 static CORE_ADDR eh_catch_catch_addr
= 0;
570 /* Address of __d_eh_catch_throw */
571 static CORE_ADDR eh_catch_throw_addr
= 0;
572 /* Sal for __d_eh_break */
573 static struct symtab_and_line
*break_callback_sal
= 0;
575 /* Code in end.c expects __d_pid to be set in the inferior,
576 otherwise __d_eh_notify_callback doesn't bother to call
577 __d_eh_break! So we poke the pid into this symbol
582 setup_d_pid_in_inferior (void)
585 struct minimal_symbol
*msymbol
;
586 char buf
[4]; /* FIXME 32x64? */
588 /* Slam the pid of the process into __d_pid; failing is only a warning! */
589 msymbol
= lookup_minimal_symbol ("__d_pid", NULL
, symfile_objfile
);
592 warning ("Unable to find __d_pid symbol in object file.");
593 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
597 anaddr
= SYMBOL_VALUE_ADDRESS (msymbol
);
598 store_unsigned_integer (buf
, 4, PIDGET (inferior_ptid
)); /* FIXME 32x64? */
599 if (target_write_memory (anaddr
, buf
, 4)) /* FIXME 32x64? */
601 warning ("Unable to write __d_pid");
602 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
608 /* elz: Used to lookup a symbol in the shared libraries.
609 This function calls shl_findsym, indirectly through a
610 call to __d_shl_get. __d_shl_get is in end.c, which is always
611 linked in by the hp compilers/linkers.
612 The call to shl_findsym cannot be made directly because it needs
613 to be active in target address space.
614 inputs: - minimal symbol pointer for the function we want to look up
615 - address in target space of the descriptor for the library
616 where we want to look the symbol up.
617 This address is retrieved using the
618 som_solib_get_solib_by_pc function (somsolib.c).
619 output: - real address in the library of the function.
620 note: the handle can be null, in which case shl_findsym will look for
621 the symbol in all the loaded shared libraries.
622 files to look at if you need reference on this stuff:
623 dld.c, dld_shl_findsym.c
625 man entry for shl_findsym */
628 find_stub_with_shl_get (struct minimal_symbol
*function
, CORE_ADDR handle
)
630 struct symbol
*get_sym
, *symbol2
;
631 struct minimal_symbol
*buff_minsym
, *msymbol
;
634 struct value
*funcval
;
637 int x
, namelen
, err_value
, tmp
= -1;
638 CORE_ADDR endo_buff_addr
, value_return_addr
, errno_return_addr
;
642 args
= alloca (sizeof (struct value
*) * 8); /* 6 for the arguments and one null one??? */
643 funcval
= find_function_in_inferior ("__d_shl_get");
644 get_sym
= lookup_symbol ("__d_shl_get", NULL
, VAR_DOMAIN
, NULL
, NULL
);
645 buff_minsym
= lookup_minimal_symbol ("__buffer", NULL
, NULL
);
646 msymbol
= lookup_minimal_symbol ("__shldp", NULL
, NULL
);
647 symbol2
= lookup_symbol ("__shldp", NULL
, VAR_DOMAIN
, NULL
, NULL
);
648 endo_buff_addr
= SYMBOL_VALUE_ADDRESS (buff_minsym
);
649 namelen
= strlen (DEPRECATED_SYMBOL_NAME (function
));
650 value_return_addr
= endo_buff_addr
+ namelen
;
651 ftype
= check_typedef (SYMBOL_TYPE (get_sym
));
654 if ((x
= value_return_addr
% 64) != 0)
655 value_return_addr
= value_return_addr
+ 64 - x
;
657 errno_return_addr
= value_return_addr
+ 64;
660 /* set up stuff needed by __d_shl_get in buffer in end.o */
662 target_write_memory (endo_buff_addr
, DEPRECATED_SYMBOL_NAME (function
), namelen
);
664 target_write_memory (value_return_addr
, (char *) &tmp
, 4);
666 target_write_memory (errno_return_addr
, (char *) &tmp
, 4);
668 target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol
),
669 (char *) &handle
, 4);
671 /* now prepare the arguments for the call */
673 args
[0] = value_from_longest (TYPE_FIELD_TYPE (ftype
, 0), 12);
674 args
[1] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 1), SYMBOL_VALUE_ADDRESS (msymbol
));
675 args
[2] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 2), endo_buff_addr
);
676 args
[3] = value_from_longest (TYPE_FIELD_TYPE (ftype
, 3), TYPE_PROCEDURE
);
677 args
[4] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 4), value_return_addr
);
678 args
[5] = value_from_pointer (TYPE_FIELD_TYPE (ftype
, 5), errno_return_addr
);
680 /* now call the function */
682 val
= call_function_by_hand (funcval
, 6, args
);
684 /* now get the results */
686 target_read_memory (errno_return_addr
, (char *) &err_value
, sizeof (err_value
));
688 target_read_memory (value_return_addr
, (char *) &stub_addr
, sizeof (stub_addr
));
690 error ("call to __d_shl_get failed, error code is %d", err_value
);
695 /* Cover routine for find_stub_with_shl_get to pass to catch_errors */
697 cover_find_stub_with_shl_get (void *args_untyped
)
699 args_for_find_stub
*args
= args_untyped
;
700 args
->return_val
= find_stub_with_shl_get (args
->msym
, args
->solib_handle
);
704 /* Initialize exception catchpoint support by looking for the
705 necessary hooks/callbacks in end.o, etc., and set the hook value to
706 point to the required debug function
712 initialize_hp_cxx_exception_support (void)
714 struct symtabs_and_lines sals
;
715 struct cleanup
*old_chain
;
716 struct cleanup
*canonical_strings_chain
= NULL
;
719 char *addr_end
= NULL
;
720 char **canonical
= (char **) NULL
;
722 struct symbol
*sym
= NULL
;
723 struct minimal_symbol
*msym
= NULL
;
724 struct objfile
*objfile
;
725 asection
*shlib_info
;
727 /* Detect and disallow recursion. On HP-UX with aCC, infinite
728 recursion is a possibility because finding the hook for exception
729 callbacks involves making a call in the inferior, which means
730 re-inserting breakpoints which can re-invoke this code */
732 static int recurse
= 0;
735 hp_cxx_exception_support_initialized
= 0;
736 deprecated_exception_support_initialized
= 0;
740 hp_cxx_exception_support
= 0;
742 /* First check if we have seen any HP compiled objects; if not,
743 it is very unlikely that HP's idiosyncratic callback mechanism
744 for exception handling debug support will be available!
745 This will percolate back up to breakpoint.c, where our callers
746 will decide to try the g++ exception-handling support instead. */
747 if (!deprecated_hp_som_som_object_present
)
750 /* We have a SOM executable with SOM debug info; find the hooks */
752 /* First look for the notify hook provided by aCC runtime libs */
753 /* If we find this symbol, we conclude that the executable must
754 have HP aCC exception support built in. If this symbol is not
755 found, even though we're a HP SOM-SOM file, we may have been
756 built with some other compiler (not aCC). This results percolates
757 back up to our callers in breakpoint.c which can decide to
758 try the g++ style of exception support instead.
759 If this symbol is found but the other symbols we require are
760 not found, there is something weird going on, and g++ support
761 should *not* be tried as an alternative.
763 ASSUMPTION: Only HP aCC code will have __eh_notify_hook defined.
764 ASSUMPTION: HP aCC and g++ modules cannot be linked together. */
766 /* libCsup has this hook; it'll usually be non-debuggable */
767 msym
= lookup_minimal_symbol (HP_ACC_EH_notify_hook
, NULL
, NULL
);
770 eh_notify_hook_addr
= SYMBOL_VALUE_ADDRESS (msym
);
771 hp_cxx_exception_support
= 1;
775 warning ("Unable to find exception callback hook (%s).", HP_ACC_EH_notify_hook
);
776 warning ("Executable may not have been compiled debuggable with HP aCC.");
777 warning ("GDB will be unable to intercept exception events.");
778 eh_notify_hook_addr
= 0;
779 hp_cxx_exception_support
= 0;
783 /* Next look for the notify callback routine in end.o */
784 /* This is always available in the SOM symbol dictionary if end.o is linked in */
785 msym
= lookup_minimal_symbol (HP_ACC_EH_notify_callback
, NULL
, NULL
);
788 eh_notify_callback_addr
= SYMBOL_VALUE_ADDRESS (msym
);
789 hp_cxx_exception_support
= 1;
793 warning ("Unable to find exception callback routine (%s).", HP_ACC_EH_notify_callback
);
794 warning ("Suggest linking executable with -g (links in /opt/langtools/lib/end.o).");
795 warning ("GDB will be unable to intercept exception events.");
796 eh_notify_callback_addr
= 0;
800 #ifndef GDB_TARGET_IS_HPPA_20W
801 /* Check whether the executable is dynamically linked or archive bound */
802 /* With an archive-bound executable we can use the raw addresses we find
803 for the callback function, etc. without modification. For an executable
804 with shared libraries, we have to do more work to find the plabel, which
805 can be the target of a call through $$dyncall from the aCC runtime support
806 library (libCsup) which is linked shared by default by aCC. */
807 /* This test below was copied from somsolib.c/somread.c. It may not be a very
808 reliable one to test that an executable is linked shared. pai/1997-07-18 */
809 shlib_info
= bfd_get_section_by_name (symfile_objfile
->obfd
, "$SHLIB_INFO$");
810 if (shlib_info
&& (bfd_section_size (symfile_objfile
->obfd
, shlib_info
) != 0))
812 /* The minsym we have has the local code address, but that's not the
813 plabel that can be used by an inter-load-module call. */
814 /* Find solib handle for main image (which has end.o), and use that
815 and the min sym as arguments to __d_shl_get() (which does the equivalent
816 of shl_findsym()) to find the plabel. */
818 args_for_find_stub args
;
819 static char message
[] = "Error while finding exception callback hook:\n";
821 args
.solib_handle
= som_solib_get_solib_by_pc (eh_notify_callback_addr
);
826 catch_errors (cover_find_stub_with_shl_get
, &args
, message
,
828 eh_notify_callback_addr
= args
.return_val
;
831 deprecated_exception_catchpoints_are_fragile
= 1;
833 if (!eh_notify_callback_addr
)
835 /* We can get here either if there is no plabel in the export list
836 for the main image, or if something strange happened (?) */
837 warning ("Couldn't find a plabel (indirect function label) for the exception callback.");
838 warning ("GDB will not be able to intercept exception events.");
843 deprecated_exception_catchpoints_are_fragile
= 0;
846 /* Now, look for the breakpointable routine in end.o */
847 /* This should also be available in the SOM symbol dict. if end.o linked in */
848 msym
= lookup_minimal_symbol (HP_ACC_EH_break
, NULL
, NULL
);
851 eh_break_addr
= SYMBOL_VALUE_ADDRESS (msym
);
852 hp_cxx_exception_support
= 1;
856 warning ("Unable to find exception callback routine to set breakpoint (%s).", HP_ACC_EH_break
);
857 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
858 warning ("GDB will be unable to intercept exception events.");
863 /* Next look for the catch enable flag provided in end.o */
864 sym
= lookup_symbol (HP_ACC_EH_catch_catch
, (struct block
*) NULL
,
865 VAR_DOMAIN
, 0, (struct symtab
**) NULL
);
866 if (sym
) /* sometimes present in debug info */
868 eh_catch_catch_addr
= SYMBOL_VALUE_ADDRESS (sym
);
869 hp_cxx_exception_support
= 1;
872 /* otherwise look in SOM symbol dict. */
874 msym
= lookup_minimal_symbol (HP_ACC_EH_catch_catch
, NULL
, NULL
);
877 eh_catch_catch_addr
= SYMBOL_VALUE_ADDRESS (msym
);
878 hp_cxx_exception_support
= 1;
882 warning ("Unable to enable interception of exception catches.");
883 warning ("Executable may not have been compiled debuggable with HP aCC.");
884 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
889 /* Next look for the catch enable flag provided end.o */
890 sym
= lookup_symbol (HP_ACC_EH_catch_catch
, (struct block
*) NULL
,
891 VAR_DOMAIN
, 0, (struct symtab
**) NULL
);
892 if (sym
) /* sometimes present in debug info */
894 eh_catch_throw_addr
= SYMBOL_VALUE_ADDRESS (sym
);
895 hp_cxx_exception_support
= 1;
898 /* otherwise look in SOM symbol dict. */
900 msym
= lookup_minimal_symbol (HP_ACC_EH_catch_throw
, NULL
, NULL
);
903 eh_catch_throw_addr
= SYMBOL_VALUE_ADDRESS (msym
);
904 hp_cxx_exception_support
= 1;
908 warning ("Unable to enable interception of exception throws.");
909 warning ("Executable may not have been compiled debuggable with HP aCC.");
910 warning ("Suggest linking executable with -g (link in /opt/langtools/lib/end.o).");
916 hp_cxx_exception_support
= 2; /* everything worked so far */
917 hp_cxx_exception_support_initialized
= 1;
918 deprecated_exception_support_initialized
= 1;
923 /* Target operation for enabling or disabling interception of
925 KIND is either EX_EVENT_THROW or EX_EVENT_CATCH
926 ENABLE is either 0 (disable) or 1 (enable).
927 Return value is NULL if no support found;
928 -1 if something went wrong,
929 or a pointer to a symtab/line struct if the breakpointable
930 address was found. */
932 struct symtab_and_line
*
933 child_enable_exception_callback (enum exception_event_kind kind
, int enable
)
937 if (!deprecated_exception_support_initialized
938 || !hp_cxx_exception_support_initialized
)
939 if (!initialize_hp_cxx_exception_support ())
942 switch (hp_cxx_exception_support
)
945 /* Assuming no HP support at all */
948 /* HP support should be present, but something went wrong */
949 return (struct symtab_and_line
*) -1; /* yuck! */
950 /* there may be other cases in the future */
953 /* Set the EH hook to point to the callback routine */
954 store_unsigned_integer (buf
, 4, enable
? eh_notify_callback_addr
: 0); /* FIXME 32x64 problem */
955 /* pai: (temp) FIXME should there be a pack operation first? */
956 if (target_write_memory (eh_notify_hook_addr
, buf
, 4)) /* FIXME 32x64 problem */
958 warning ("Could not write to target memory for exception event callback.");
959 warning ("Interception of exception events may not work.");
960 return (struct symtab_and_line
*) -1;
964 /* Ensure that __d_pid is set up correctly -- end.c code checks this. :-( */
965 if (PIDGET (inferior_ptid
) > 0)
967 if (setup_d_pid_in_inferior ())
968 return (struct symtab_and_line
*) -1;
972 warning ("Internal error: Invalid inferior pid? Cannot intercept exception events.");
973 return (struct symtab_and_line
*) -1;
980 store_unsigned_integer (buf
, 4, enable
? 1 : 0);
981 if (target_write_memory (eh_catch_throw_addr
, buf
, 4)) /* FIXME 32x64? */
983 warning ("Couldn't enable exception throw interception.");
984 return (struct symtab_and_line
*) -1;
988 store_unsigned_integer (buf
, 4, enable
? 1 : 0);
989 if (target_write_memory (eh_catch_catch_addr
, buf
, 4)) /* FIXME 32x64? */
991 warning ("Couldn't enable exception catch interception.");
992 return (struct symtab_and_line
*) -1;
996 error ("Request to enable unknown or unsupported exception event.");
999 /* Copy break address into new sal struct, malloc'ing if needed. */
1000 if (!break_callback_sal
)
1002 break_callback_sal
= (struct symtab_and_line
*) xmalloc (sizeof (struct symtab_and_line
));
1004 init_sal (break_callback_sal
);
1005 break_callback_sal
->symtab
= NULL
;
1006 break_callback_sal
->pc
= eh_break_addr
;
1007 break_callback_sal
->line
= 0;
1008 break_callback_sal
->end
= eh_break_addr
;
1010 return break_callback_sal
;
1013 /* Record some information about the current exception event */
1014 static struct exception_event_record current_ex_event
;
1015 /* Convenience struct */
1016 static struct symtab_and_line null_symtab_and_line
=
1019 /* Report current exception event. Returns a pointer to a record
1020 that describes the kind of the event, where it was thrown from,
1021 and where it will be caught. More information may be reported
1023 struct exception_event_record
*
1024 child_get_current_exception_event (void)
1026 CORE_ADDR event_kind
;
1027 CORE_ADDR throw_addr
;
1028 CORE_ADDR catch_addr
;
1029 struct frame_info
*fi
, *curr_frame
;
1032 curr_frame
= get_current_frame ();
1034 return (struct exception_event_record
*) NULL
;
1036 /* Go up one frame to __d_eh_notify_callback, because at the
1037 point when this code is executed, there's garbage in the
1038 arguments of __d_eh_break. */
1039 fi
= find_relative_frame (curr_frame
, &level
);
1041 return (struct exception_event_record
*) NULL
;
1045 /* Read in the arguments */
1046 /* __d_eh_notify_callback() is called with 3 arguments:
1047 1. event kind catch or throw
1048 2. the target address if known
1049 3. a flag -- not sure what this is. pai/1997-07-17 */
1050 event_kind
= read_register (HPPA_ARG0_REGNUM
);
1051 catch_addr
= read_register (HPPA_ARG1_REGNUM
);
1053 /* Now go down to a user frame */
1054 /* For a throw, __d_eh_break is called by
1055 __d_eh_notify_callback which is called by
1056 __notify_throw which is called
1058 For a catch, __d_eh_break is called by
1059 __d_eh_notify_callback which is called by
1060 <stackwalking stuff> which is called by
1061 __throw__<stuff> or __rethrow_<stuff> which is called
1063 /* FIXME: Don't use such magic numbers; search for the frames */
1064 level
= (event_kind
== EX_EVENT_THROW
) ? 3 : 4;
1065 fi
= find_relative_frame (curr_frame
, &level
);
1067 return (struct exception_event_record
*) NULL
;
1070 throw_addr
= get_frame_pc (fi
);
1072 /* Go back to original (top) frame */
1073 select_frame (curr_frame
);
1075 current_ex_event
.kind
= (enum exception_event_kind
) event_kind
;
1076 current_ex_event
.throw_sal
= find_pc_line (throw_addr
, 1);
1077 current_ex_event
.catch_sal
= find_pc_line (catch_addr
, 1);
1079 return ¤t_ex_event
;
1082 /* Signal frames. */
1083 struct hppa_hpux_sigtramp_unwind_cache
1086 struct trad_frame_saved_reg
*saved_regs
;
1089 static int hppa_hpux_tramp_reg
[] = {
1091 HPPA_PCOQ_HEAD_REGNUM
,
1092 HPPA_PCSQ_HEAD_REGNUM
,
1093 HPPA_PCOQ_TAIL_REGNUM
,
1094 HPPA_PCSQ_TAIL_REGNUM
,
1102 HPPA_SR4_REGNUM
+ 1,
1103 HPPA_SR4_REGNUM
+ 2,
1104 HPPA_SR4_REGNUM
+ 3,
1105 HPPA_SR4_REGNUM
+ 4,
1106 HPPA_SR4_REGNUM
+ 5,
1107 HPPA_SR4_REGNUM
+ 6,
1108 HPPA_SR4_REGNUM
+ 7,
1116 HPPA_TR0_REGNUM
+ 1,
1117 HPPA_TR0_REGNUM
+ 2,
1121 static struct hppa_hpux_sigtramp_unwind_cache
*
1122 hppa_hpux_sigtramp_frame_unwind_cache (struct frame_info
*next_frame
,
1126 struct gdbarch
*gdbarch
= get_frame_arch (next_frame
);
1127 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
1128 struct hppa_hpux_sigtramp_unwind_cache
*info
;
1130 CORE_ADDR sp
, scptr
;
1131 int i
, incr
, off
, szoff
;
1136 info
= FRAME_OBSTACK_ZALLOC (struct hppa_hpux_sigtramp_unwind_cache
);
1138 info
->saved_regs
= trad_frame_alloc_saved_regs (next_frame
);
1140 sp
= frame_unwind_register_unsigned (next_frame
, HPPA_SP_REGNUM
);
1145 /* See /usr/include/machine/save_state.h for the structure of the save_state_t
1148 flag
= read_memory_unsigned_integer(scptr
, 4);
1152 /* Narrow registers. */
1153 off
= scptr
+ offsetof (save_state_t
, ss_narrow
);
1159 /* Wide registers. */
1160 off
= scptr
+ offsetof (save_state_t
, ss_wide
) + 8;
1162 szoff
= (tdep
->bytes_per_address
== 4 ? 4 : 0);
1165 for (i
= 1; i
< 32; i
++)
1167 info
->saved_regs
[HPPA_R0_REGNUM
+ i
].addr
= off
+ szoff
;
1172 i
< sizeof(hppa_hpux_tramp_reg
) / sizeof(hppa_hpux_tramp_reg
[0]);
1175 if (hppa_hpux_tramp_reg
[i
] > 0)
1176 info
->saved_regs
[hppa_hpux_tramp_reg
[i
]].addr
= off
+ szoff
;
1182 info
->base
= frame_unwind_register_unsigned (next_frame
, HPPA_SP_REGNUM
);
1188 hppa_hpux_sigtramp_frame_this_id (struct frame_info
*next_frame
,
1189 void **this_prologue_cache
,
1190 struct frame_id
*this_id
)
1192 struct hppa_hpux_sigtramp_unwind_cache
*info
1193 = hppa_hpux_sigtramp_frame_unwind_cache (next_frame
, this_prologue_cache
);
1194 *this_id
= frame_id_build (info
->base
, frame_pc_unwind (next_frame
));
1198 hppa_hpux_sigtramp_frame_prev_register (struct frame_info
*next_frame
,
1199 void **this_prologue_cache
,
1200 int regnum
, int *optimizedp
,
1201 enum lval_type
*lvalp
,
1203 int *realnump
, void *valuep
)
1205 struct hppa_hpux_sigtramp_unwind_cache
*info
1206 = hppa_hpux_sigtramp_frame_unwind_cache (next_frame
, this_prologue_cache
);
1207 hppa_frame_prev_register_helper (next_frame
, info
->saved_regs
, regnum
,
1208 optimizedp
, lvalp
, addrp
, realnump
, valuep
);
1211 static const struct frame_unwind hppa_hpux_sigtramp_frame_unwind
= {
1213 hppa_hpux_sigtramp_frame_this_id
,
1214 hppa_hpux_sigtramp_frame_prev_register
1217 static const struct frame_unwind
*
1218 hppa_hpux_sigtramp_unwind_sniffer (struct frame_info
*next_frame
)
1220 CORE_ADDR pc
= frame_pc_unwind (next_frame
);
1223 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
1225 if (name
&& strcmp(name
, "_sigreturn") == 0)
1226 return &hppa_hpux_sigtramp_frame_unwind
;
1232 hppa_hpux_som_find_global_pointer (struct value
*function
)
1236 faddr
= value_as_address (function
);
1238 /* Is this a plabel? If so, dereference it to get the gp value. */
1246 status
= target_read_memory (faddr
+ 4, buf
, sizeof (buf
));
1248 return extract_unsigned_integer (buf
, sizeof (buf
));
1251 return som_solib_get_got_by_pc (faddr
);
1255 hppa_hpux_push_dummy_code (struct gdbarch
*gdbarch
, CORE_ADDR sp
,
1256 CORE_ADDR funcaddr
, int using_gcc
,
1257 struct value
**args
, int nargs
,
1258 struct type
*value_type
,
1259 CORE_ADDR
*real_pc
, CORE_ADDR
*bp_addr
)
1261 /* FIXME: tausq/2004-06-09: This needs much more testing. It is broken
1262 for pa64, but we should be able to get it to work with a little bit
1263 of work. gdb-6.1 has a lot of code to handle various cases; I've tried to
1264 simplify it and avoid compile-time conditionals. */
1266 /* On HPUX, functions in the main executable and in libraries can be located
1267 in different spaces. In order for us to be able to select the right
1268 space for the function call, we need to go through an instruction seqeunce
1269 to select the right space for the target function, call it, and then
1270 restore the space on return.
1272 There are two helper routines that can be used for this task -- if
1273 an application is linked with gcc, it will contain a __gcc_plt_call
1274 helper function. __gcc_plt_call, when passed the entry point of an
1275 import stub, will do the necessary space setting/restoration for the
1278 For programs that are compiled/linked with the HP compiler, a similar
1279 function called __d_plt_call exists; __d_plt_call expects a PLABEL instead
1280 of an import stub as an argument.
1283 To summarize, the call flow is:
1284 current function -> dummy frame -> __gcc_plt_call (import stub)
1287 current function -> dummy frame -> __d_plt_call (plabel)
1291 In general the "funcaddr" argument passed to push_dummy_code is the actual
1292 entry point of the target function. For __gcc_plt_call, we need to
1293 locate the import stub for the corresponding function. Failing that,
1294 we construct a dummy "import stub" on the stack to pass as an argument.
1295 For __d_plt_call, we similarly synthesize a PLABEL on the stack to
1296 pass to the helper function.
1298 An additional twist is that, in order for us to restore the space register
1299 to its starting state, we need __gcc_plt_call/__d_plt_call to return
1300 to the instruction where we started the call. However, if we put
1301 the breakpoint there, gdb will complain because it will find two
1302 frames on the stack with the same (sp, pc) (with the dummy frame in
1303 between). Currently, we set the return pointer to (pc - 4) of the
1304 current function. FIXME: This is not an ideal solution; possibly if the
1305 current pc is at the beginning of a page, this will cause a page fault.
1306 Need to understand this better and figure out a better way to fix it. */
1308 struct minimal_symbol
*sym
;
1310 /* Nonzero if we will use GCC's PLT call routine. This routine must be
1311 passed an import stub, not a PLABEL. It is also necessary to get %r19
1312 before performing the call. (This is done by push_dummy_call.) */
1313 int use_gcc_plt_call
= 1;
1315 /* See if __gcc_plt_call is available; if not we will use the HP version
1317 sym
= lookup_minimal_symbol ("__gcc_plt_call", NULL
, NULL
);
1319 use_gcc_plt_call
= 0;
1321 /* If using __gcc_plt_call, we need to make sure we pass in an import
1322 stub. funcaddr can be pointing to an export stub or a real function,
1323 so we try to resolve it to the import stub. */
1324 if (use_gcc_plt_call
)
1326 struct objfile
*objfile
;
1327 struct minimal_symbol
*funsym
, *stubsym
;
1328 CORE_ADDR stubaddr
= 0;
1330 funsym
= lookup_minimal_symbol_by_pc (funcaddr
);
1332 error ("Unable to find symbol for target function.\n");
1334 ALL_OBJFILES (objfile
)
1336 stubsym
= lookup_minimal_symbol_solib_trampoline
1337 (SYMBOL_LINKAGE_NAME (funsym
), objfile
);
1341 struct unwind_table_entry
*u
;
1343 u
= find_unwind_entry (SYMBOL_VALUE (stubsym
));
1345 || (u
->stub_unwind
.stub_type
!= IMPORT
1346 && u
->stub_unwind
.stub_type
!= IMPORT_SHLIB
))
1349 stubaddr
= SYMBOL_VALUE (stubsym
);
1351 /* If we found an IMPORT stub, then we can stop searching;
1352 if we found an IMPORT_SHLIB, we want to continue the search
1353 in the hopes that we will find an IMPORT stub. */
1354 if (u
->stub_unwind
.stub_type
== IMPORT
)
1361 /* Argument to __gcc_plt_call is passed in r22. */
1362 regcache_cooked_write_unsigned (current_regcache
, 22, stubaddr
);
1366 /* No import stub found; let's synthesize one. */
1368 /* ldsid %r21, %r1 */
1369 write_memory_unsigned_integer (sp
, 4, 0x02a010a1);
1371 write_memory_unsigned_integer (sp
+ 4, 4, 0x00011820);
1372 /* be 0(%sr0, %r21) */
1373 write_memory_unsigned_integer (sp
+ 8, 4, 0xe2a00000);
1375 write_memory_unsigned_integer (sp
+ 12, 4, 0x08000240);
1377 regcache_cooked_write_unsigned (current_regcache
, 21, funcaddr
);
1378 regcache_cooked_write_unsigned (current_regcache
, 22, sp
);
1381 /* We set the breakpoint address and r31 to (close to) where the current
1382 pc is; when __gcc_plt_call returns, it will restore pcsqh to the
1383 current value based on this. The -4 is needed for frame unwinding
1384 to work properly -- we need to land in a different function than
1385 the current function. */
1386 *bp_addr
= (read_register (HPPA_PCOQ_HEAD_REGNUM
) & ~3) - 4;
1387 regcache_cooked_write_unsigned (current_regcache
, 31, *bp_addr
);
1389 /* Continue from __gcc_plt_call. */
1390 *real_pc
= SYMBOL_VALUE (sym
);
1396 /* Use __d_plt_call as a fallback; __d_plt_call expects to be called
1397 with a plabel, so we need to build one. */
1399 sym
= lookup_minimal_symbol ("__d_plt_call", NULL
, NULL
);
1401 error("Can't find an address for __d_plt_call or __gcc_plt_call "
1402 "trampoline\nSuggest linking executable with -g or compiling "
1405 gp
= gdbarch_tdep (gdbarch
)->find_global_pointer (funcaddr
);
1406 write_memory_unsigned_integer (sp
, 4, funcaddr
);
1407 write_memory_unsigned_integer (sp
+ 4, 4, gp
);
1409 /* plabel is passed in r22 */
1410 regcache_cooked_write_unsigned (current_regcache
, 22, sp
);
1413 /* Pushed one stack frame, which has to be 64-byte aligned. */
1420 /* Bit in the `ss_flag' member of `struct save_state' that indicates
1421 the state was saved from a system call. From
1422 <machine/save_state.h>. */
1423 #define HPPA_HPUX_SS_INSYSCALL 0x02
1426 hppa_hpux_read_pc (ptid_t ptid
)
1430 /* If we're currently in a system call return the contents of %r31. */
1431 flags
= read_register_pid (HPPA_FLAGS_REGNUM
, ptid
);
1432 if (flags
& HPPA_HPUX_SS_INSYSCALL
)
1433 return read_register_pid (HPPA_R31_REGNUM
, ptid
) & ~0x3;
1435 return hppa_read_pc (ptid
);
1439 hppa_hpux_write_pc (CORE_ADDR pc
, ptid_t ptid
)
1443 /* If we're currently in a system call also write PC into %r31. */
1444 flags
= read_register_pid (HPPA_FLAGS_REGNUM
, ptid
);
1445 if (flags
& HPPA_HPUX_SS_INSYSCALL
)
1446 write_register_pid (HPPA_R31_REGNUM
, pc
| 0x3, ptid
);
1448 return hppa_write_pc (pc
, ptid
);
1452 hppa_hpux_unwind_pc (struct gdbarch
*gdbarch
, struct frame_info
*next_frame
)
1456 /* If we're currently in a system call return the contents of %r31. */
1457 flags
= frame_unwind_register_unsigned (next_frame
, HPPA_FLAGS_REGNUM
);
1458 if (flags
& HPPA_HPUX_SS_INSYSCALL
)
1459 return frame_unwind_register_unsigned (next_frame
, HPPA_R31_REGNUM
) & ~0x3;
1461 return hppa_unwind_pc (gdbarch
, next_frame
);
1466 hppa_hpux_inferior_created (struct target_ops
*objfile
, int from_tty
)
1468 /* Some HP-UX related globals to clear when a new "main"
1469 symbol file is loaded. HP-specific. */
1470 deprecated_hp_som_som_object_present
= 0;
1471 hp_cxx_exception_support_initialized
= 0;
1475 hppa_hpux_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
1477 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
1479 if (tdep
->bytes_per_address
== 4)
1480 tdep
->in_solib_call_trampoline
= hppa32_hpux_in_solib_call_trampoline
;
1482 tdep
->in_solib_call_trampoline
= hppa64_hpux_in_solib_call_trampoline
;
1484 set_gdbarch_in_solib_return_trampoline (gdbarch
,
1485 hppa_hpux_in_solib_return_trampoline
);
1486 set_gdbarch_skip_trampoline_code (gdbarch
, hppa_hpux_skip_trampoline_code
);
1488 set_gdbarch_push_dummy_code (gdbarch
, hppa_hpux_push_dummy_code
);
1489 set_gdbarch_call_dummy_location (gdbarch
, ON_STACK
);
1491 set_gdbarch_read_pc (gdbarch
, hppa_hpux_read_pc
);
1492 set_gdbarch_write_pc (gdbarch
, hppa_hpux_write_pc
);
1493 set_gdbarch_unwind_pc (gdbarch
, hppa_hpux_unwind_pc
);
1495 frame_unwind_append_sniffer (gdbarch
, hppa_hpux_sigtramp_unwind_sniffer
);
1497 observer_attach_inferior_created (hppa_hpux_inferior_created
);
1501 hppa_hpux_som_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
1503 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
1507 tdep
->find_global_pointer
= hppa_hpux_som_find_global_pointer
;
1508 hppa_hpux_init_abi (info
, gdbarch
);
1512 hppa_hpux_elf_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
1514 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
1517 hppa_hpux_init_abi (info
, gdbarch
);
1521 _initialize_hppa_hpux_tdep (void)
1523 gdbarch_register_osabi (bfd_arch_hppa
, 0, GDB_OSABI_HPUX_SOM
,
1524 hppa_hpux_som_init_abi
);
1525 gdbarch_register_osabi (bfd_arch_hppa
, bfd_mach_hppa20w
, GDB_OSABI_HPUX_ELF
,
1526 hppa_hpux_elf_init_abi
);