Commit | Line | Data |
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04714b91 AC |
1 | /* Perform an inferior function call, for GDB, the GNU debugger. |
2 | ||
3 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, | |
9ab9195f EZ |
4 | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 |
5 | Free Software Foundation, Inc. | |
04714b91 AC |
6 | |
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | Boston, MA 02111-1307, USA. */ | |
23 | ||
24 | #include "defs.h" | |
25 | #include "breakpoint.h" | |
26 | #include "target.h" | |
27 | #include "regcache.h" | |
28 | #include "inferior.h" | |
29 | #include "gdb_assert.h" | |
30 | #include "block.h" | |
31 | #include "gdbcore.h" | |
32 | #include "language.h" | |
9ab9195f | 33 | #include "objfiles.h" |
04714b91 AC |
34 | #include "gdbcmd.h" |
35 | #include "command.h" | |
36 | #include "gdb_string.h" | |
b9362cc7 | 37 | #include "infcall.h" |
04714b91 AC |
38 | |
39 | /* NOTE: cagney/2003-04-16: What's the future of this code? | |
40 | ||
41 | GDB needs an asynchronous expression evaluator, that means an | |
42 | asynchronous inferior function call implementation, and that in | |
43 | turn means restructuring the code so that it is event driven. */ | |
44 | ||
45 | /* How you should pass arguments to a function depends on whether it | |
46 | was defined in K&R style or prototype style. If you define a | |
47 | function using the K&R syntax that takes a `float' argument, then | |
48 | callers must pass that argument as a `double'. If you define the | |
49 | function using the prototype syntax, then you must pass the | |
50 | argument as a `float', with no promotion. | |
51 | ||
52 | Unfortunately, on certain older platforms, the debug info doesn't | |
53 | indicate reliably how each function was defined. A function type's | |
54 | TYPE_FLAG_PROTOTYPED flag may be clear, even if the function was | |
55 | defined in prototype style. When calling a function whose | |
56 | TYPE_FLAG_PROTOTYPED flag is clear, GDB consults this flag to | |
57 | decide what to do. | |
58 | ||
59 | For modern targets, it is proper to assume that, if the prototype | |
60 | flag is clear, that can be trusted: `float' arguments should be | |
61 | promoted to `double'. For some older targets, if the prototype | |
62 | flag is clear, that doesn't tell us anything. The default is to | |
63 | trust the debug information; the user can override this behavior | |
64 | with "set coerce-float-to-double 0". */ | |
65 | ||
66 | static int coerce_float_to_double_p = 1; | |
67 | ||
68 | /* This boolean tells what gdb should do if a signal is received while | |
69 | in a function called from gdb (call dummy). If set, gdb unwinds | |
70 | the stack and restore the context to what as it was before the | |
71 | call. | |
72 | ||
73 | The default is to stop in the frame where the signal was received. */ | |
74 | ||
75 | int unwind_on_signal_p = 0; | |
76 | ||
77 | /* Perform the standard coercions that are specified | |
78 | for arguments to be passed to C functions. | |
79 | ||
80 | If PARAM_TYPE is non-NULL, it is the expected parameter type. | |
81 | IS_PROTOTYPED is non-zero if the function declaration is prototyped. */ | |
82 | ||
83 | static struct value * | |
84 | value_arg_coerce (struct value *arg, struct type *param_type, | |
85 | int is_prototyped) | |
86 | { | |
52f0bd74 AC |
87 | struct type *arg_type = check_typedef (VALUE_TYPE (arg)); |
88 | struct type *type | |
04714b91 AC |
89 | = param_type ? check_typedef (param_type) : arg_type; |
90 | ||
91 | switch (TYPE_CODE (type)) | |
92 | { | |
93 | case TYPE_CODE_REF: | |
94 | if (TYPE_CODE (arg_type) != TYPE_CODE_REF | |
95 | && TYPE_CODE (arg_type) != TYPE_CODE_PTR) | |
96 | { | |
97 | arg = value_addr (arg); | |
98 | VALUE_TYPE (arg) = param_type; | |
99 | return arg; | |
100 | } | |
101 | break; | |
102 | case TYPE_CODE_INT: | |
103 | case TYPE_CODE_CHAR: | |
104 | case TYPE_CODE_BOOL: | |
105 | case TYPE_CODE_ENUM: | |
106 | /* If we don't have a prototype, coerce to integer type if necessary. */ | |
107 | if (!is_prototyped) | |
108 | { | |
109 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int)) | |
110 | type = builtin_type_int; | |
111 | } | |
112 | /* Currently all target ABIs require at least the width of an integer | |
113 | type for an argument. We may have to conditionalize the following | |
114 | type coercion for future targets. */ | |
115 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int)) | |
116 | type = builtin_type_int; | |
117 | break; | |
118 | case TYPE_CODE_FLT: | |
119 | if (!is_prototyped && coerce_float_to_double_p) | |
120 | { | |
121 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_double)) | |
122 | type = builtin_type_double; | |
123 | else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin_type_double)) | |
124 | type = builtin_type_long_double; | |
125 | } | |
126 | break; | |
127 | case TYPE_CODE_FUNC: | |
128 | type = lookup_pointer_type (type); | |
129 | break; | |
130 | case TYPE_CODE_ARRAY: | |
131 | /* Arrays are coerced to pointers to their first element, unless | |
132 | they are vectors, in which case we want to leave them alone, | |
133 | because they are passed by value. */ | |
134 | if (current_language->c_style_arrays) | |
135 | if (!TYPE_VECTOR (type)) | |
136 | type = lookup_pointer_type (TYPE_TARGET_TYPE (type)); | |
137 | break; | |
138 | case TYPE_CODE_UNDEF: | |
139 | case TYPE_CODE_PTR: | |
140 | case TYPE_CODE_STRUCT: | |
141 | case TYPE_CODE_UNION: | |
142 | case TYPE_CODE_VOID: | |
143 | case TYPE_CODE_SET: | |
144 | case TYPE_CODE_RANGE: | |
145 | case TYPE_CODE_STRING: | |
146 | case TYPE_CODE_BITSTRING: | |
147 | case TYPE_CODE_ERROR: | |
148 | case TYPE_CODE_MEMBER: | |
149 | case TYPE_CODE_METHOD: | |
150 | case TYPE_CODE_COMPLEX: | |
151 | default: | |
152 | break; | |
153 | } | |
154 | ||
155 | return value_cast (type, arg); | |
156 | } | |
157 | ||
158 | /* Determine a function's address and its return type from its value. | |
159 | Calls error() if the function is not valid for calling. */ | |
160 | ||
a9fa03de | 161 | CORE_ADDR |
04714b91 AC |
162 | find_function_addr (struct value *function, struct type **retval_type) |
163 | { | |
52f0bd74 AC |
164 | struct type *ftype = check_typedef (VALUE_TYPE (function)); |
165 | enum type_code code = TYPE_CODE (ftype); | |
04714b91 AC |
166 | struct type *value_type; |
167 | CORE_ADDR funaddr; | |
168 | ||
169 | /* If it's a member function, just look at the function | |
170 | part of it. */ | |
171 | ||
172 | /* Determine address to call. */ | |
173 | if (code == TYPE_CODE_FUNC || code == TYPE_CODE_METHOD) | |
174 | { | |
175 | funaddr = VALUE_ADDRESS (function); | |
176 | value_type = TYPE_TARGET_TYPE (ftype); | |
177 | } | |
178 | else if (code == TYPE_CODE_PTR) | |
179 | { | |
180 | funaddr = value_as_address (function); | |
181 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
182 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC | |
183 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
184 | { | |
e2d0e7eb AC |
185 | funaddr = gdbarch_convert_from_func_ptr_addr (current_gdbarch, |
186 | funaddr, | |
187 | ¤t_target); | |
04714b91 AC |
188 | value_type = TYPE_TARGET_TYPE (ftype); |
189 | } | |
190 | else | |
191 | value_type = builtin_type_int; | |
192 | } | |
193 | else if (code == TYPE_CODE_INT) | |
194 | { | |
195 | /* Handle the case of functions lacking debugging info. | |
196 | Their values are characters since their addresses are char */ | |
197 | if (TYPE_LENGTH (ftype) == 1) | |
198 | funaddr = value_as_address (value_addr (function)); | |
199 | else | |
200 | /* Handle integer used as address of a function. */ | |
201 | funaddr = (CORE_ADDR) value_as_long (function); | |
202 | ||
203 | value_type = builtin_type_int; | |
204 | } | |
205 | else | |
206 | error ("Invalid data type for function to be called."); | |
207 | ||
7d9b040b RC |
208 | if (retval_type != NULL) |
209 | *retval_type = value_type; | |
f622ad42 | 210 | return funaddr + FUNCTION_START_OFFSET; |
04714b91 AC |
211 | } |
212 | ||
213 | /* Call breakpoint_auto_delete on the current contents of the bpstat | |
214 | pointed to by arg (which is really a bpstat *). */ | |
215 | ||
216 | static void | |
217 | breakpoint_auto_delete_contents (void *arg) | |
218 | { | |
219 | breakpoint_auto_delete (*(bpstat *) arg); | |
220 | } | |
221 | ||
7043d8dc AC |
222 | static CORE_ADDR |
223 | generic_push_dummy_code (struct gdbarch *gdbarch, | |
224 | CORE_ADDR sp, CORE_ADDR funaddr, int using_gcc, | |
225 | struct value **args, int nargs, | |
226 | struct type *value_type, | |
227 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr) | |
228 | { | |
229 | /* Something here to findout the size of a breakpoint and then | |
230 | allocate space for it on the stack. */ | |
231 | int bplen; | |
232 | /* This code assumes frame align. */ | |
233 | gdb_assert (gdbarch_frame_align_p (gdbarch)); | |
234 | /* Force the stack's alignment. The intent is to ensure that the SP | |
235 | is aligned to at least a breakpoint instruction's boundary. */ | |
236 | sp = gdbarch_frame_align (gdbarch, sp); | |
237 | /* Allocate space for, and then position the breakpoint on the | |
238 | stack. */ | |
239 | if (gdbarch_inner_than (gdbarch, 1, 2)) | |
240 | { | |
241 | CORE_ADDR bppc = sp; | |
242 | gdbarch_breakpoint_from_pc (gdbarch, &bppc, &bplen); | |
243 | sp = gdbarch_frame_align (gdbarch, sp - bplen); | |
244 | (*bp_addr) = sp; | |
245 | /* Should the breakpoint size/location be re-computed here? */ | |
246 | } | |
247 | else | |
248 | { | |
249 | (*bp_addr) = sp; | |
250 | gdbarch_breakpoint_from_pc (gdbarch, bp_addr, &bplen); | |
251 | sp = gdbarch_frame_align (gdbarch, sp + bplen); | |
252 | } | |
253 | /* Inferior resumes at the function entry point. */ | |
254 | (*real_pc) = funaddr; | |
255 | return sp; | |
256 | } | |
257 | ||
d3712828 AC |
258 | /* For CALL_DUMMY_ON_STACK, push a breakpoint sequence that the called |
259 | function returns to. */ | |
7043d8dc AC |
260 | |
261 | static CORE_ADDR | |
262 | push_dummy_code (struct gdbarch *gdbarch, | |
263 | CORE_ADDR sp, CORE_ADDR funaddr, int using_gcc, | |
264 | struct value **args, int nargs, | |
265 | struct type *value_type, | |
266 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr) | |
267 | { | |
268 | if (gdbarch_push_dummy_code_p (gdbarch)) | |
269 | return gdbarch_push_dummy_code (gdbarch, sp, funaddr, using_gcc, | |
270 | args, nargs, value_type, real_pc, bp_addr); | |
7043d8dc AC |
271 | else |
272 | return generic_push_dummy_code (gdbarch, sp, funaddr, using_gcc, | |
273 | args, nargs, value_type, real_pc, bp_addr); | |
274 | } | |
275 | ||
04714b91 AC |
276 | /* All this stuff with a dummy frame may seem unnecessarily complicated |
277 | (why not just save registers in GDB?). The purpose of pushing a dummy | |
278 | frame which looks just like a real frame is so that if you call a | |
279 | function and then hit a breakpoint (get a signal, etc), "backtrace" | |
280 | will look right. Whether the backtrace needs to actually show the | |
281 | stack at the time the inferior function was called is debatable, but | |
282 | it certainly needs to not display garbage. So if you are contemplating | |
283 | making dummy frames be different from normal frames, consider that. */ | |
284 | ||
285 | /* Perform a function call in the inferior. | |
286 | ARGS is a vector of values of arguments (NARGS of them). | |
287 | FUNCTION is a value, the function to be called. | |
288 | Returns a value representing what the function returned. | |
289 | May fail to return, if a breakpoint or signal is hit | |
290 | during the execution of the function. | |
291 | ||
292 | ARGS is modified to contain coerced values. */ | |
293 | ||
294 | struct value * | |
295 | call_function_by_hand (struct value *function, int nargs, struct value **args) | |
296 | { | |
52f0bd74 | 297 | CORE_ADDR sp; |
04714b91 | 298 | CORE_ADDR dummy_addr; |
04714b91 AC |
299 | struct type *value_type; |
300 | unsigned char struct_return; | |
301 | CORE_ADDR struct_addr = 0; | |
302 | struct regcache *retbuf; | |
303 | struct cleanup *retbuf_cleanup; | |
304 | struct inferior_status *inf_status; | |
305 | struct cleanup *inf_status_cleanup; | |
306 | CORE_ADDR funaddr; | |
307 | int using_gcc; /* Set to version of gcc in use, or zero if not gcc */ | |
308 | CORE_ADDR real_pc; | |
04714b91 | 309 | struct type *ftype = check_typedef (SYMBOL_TYPE (function)); |
d585e13a | 310 | CORE_ADDR bp_addr; |
04714b91 | 311 | |
04714b91 AC |
312 | if (!target_has_execution) |
313 | noprocess (); | |
314 | ||
315 | /* Create a cleanup chain that contains the retbuf (buffer | |
316 | containing the register values). This chain is create BEFORE the | |
317 | inf_status chain so that the inferior status can cleaned up | |
318 | (restored or discarded) without having the retbuf freed. */ | |
319 | retbuf = regcache_xmalloc (current_gdbarch); | |
320 | retbuf_cleanup = make_cleanup_regcache_xfree (retbuf); | |
321 | ||
322 | /* A cleanup for the inferior status. Create this AFTER the retbuf | |
323 | so that this can be discarded or applied without interfering with | |
324 | the regbuf. */ | |
325 | inf_status = save_inferior_status (1); | |
326 | inf_status_cleanup = make_cleanup_restore_inferior_status (inf_status); | |
327 | ||
58d28df8 AC |
328 | /* FIXME: cagney/2003-02-26: Step zero of this little tinker is to |
329 | extract the generic dummy frame code from the architecture | |
330 | vector. Hence this direct call. | |
331 | ||
332 | A follow-on change is to modify this interface so that it takes | |
333 | thread OR frame OR ptid as a parameter, and returns a dummy frame | |
334 | handle. The handle can then be used further down as a parameter | |
335 | to generic_save_dummy_frame_tos(). Hmm, thinking about it, since | |
336 | everything is ment to be using generic dummy frames, why not even | |
337 | use some of the dummy frame code to here - do a regcache dup and | |
338 | then pass the duped regcache, along with all the other stuff, at | |
339 | one single point. | |
340 | ||
341 | In fact, you can even save the structure's return address in the | |
342 | dummy frame and fix one of those nasty lost struct return edge | |
343 | conditions. */ | |
344 | generic_push_dummy_frame (); | |
04714b91 | 345 | |
04714b91 | 346 | /* Ensure that the initial SP is correctly aligned. */ |
ebc7896c AC |
347 | { |
348 | CORE_ADDR old_sp = read_sp (); | |
349 | if (gdbarch_frame_align_p (current_gdbarch)) | |
350 | { | |
8b148df9 AC |
351 | sp = gdbarch_frame_align (current_gdbarch, old_sp); |
352 | /* NOTE: cagney/2003-08-13: Skip the "red zone". For some | |
353 | ABIs, a function can use memory beyond the inner most stack | |
354 | address. AMD64 called that region the "red zone". Skip at | |
355 | least the "red zone" size before allocating any space on | |
356 | the stack. */ | |
357 | if (INNER_THAN (1, 2)) | |
358 | sp -= gdbarch_frame_red_zone_size (current_gdbarch); | |
359 | else | |
360 | sp += gdbarch_frame_red_zone_size (current_gdbarch); | |
361 | /* Still aligned? */ | |
362 | gdb_assert (sp == gdbarch_frame_align (current_gdbarch, sp)); | |
ebc7896c AC |
363 | /* NOTE: cagney/2002-09-18: |
364 | ||
365 | On a RISC architecture, a void parameterless generic dummy | |
366 | frame (i.e., no parameters, no result) typically does not | |
367 | need to push anything the stack and hence can leave SP and | |
c48a845b | 368 | FP. Similarly, a frameless (possibly leaf) function does |
ebc7896c AC |
369 | not push anything on the stack and, hence, that too can |
370 | leave FP and SP unchanged. As a consequence, a sequence of | |
371 | void parameterless generic dummy frame calls to frameless | |
372 | functions will create a sequence of effectively identical | |
373 | frames (SP, FP and TOS and PC the same). This, not | |
374 | suprisingly, results in what appears to be a stack in an | |
375 | infinite loop --- when GDB tries to find a generic dummy | |
376 | frame on the internal dummy frame stack, it will always | |
377 | find the first one. | |
378 | ||
379 | To avoid this problem, the code below always grows the | |
380 | stack. That way, two dummy frames can never be identical. | |
381 | It does burn a few bytes of stack but that is a small price | |
382 | to pay :-). */ | |
ebc7896c AC |
383 | if (sp == old_sp) |
384 | { | |
385 | if (INNER_THAN (1, 2)) | |
386 | /* Stack grows down. */ | |
387 | sp = gdbarch_frame_align (current_gdbarch, old_sp - 1); | |
388 | else | |
389 | /* Stack grows up. */ | |
390 | sp = gdbarch_frame_align (current_gdbarch, old_sp + 1); | |
391 | } | |
392 | gdb_assert ((INNER_THAN (1, 2) && sp <= old_sp) | |
393 | || (INNER_THAN (2, 1) && sp >= old_sp)); | |
394 | } | |
395 | else | |
a59fe496 AC |
396 | /* FIXME: cagney/2002-09-18: Hey, you loose! |
397 | ||
8b148df9 AC |
398 | Who knows how badly aligned the SP is! |
399 | ||
400 | If the generic dummy frame ends up empty (because nothing is | |
401 | pushed) GDB won't be able to correctly perform back traces. | |
402 | If a target is having trouble with backtraces, first thing to | |
403 | do is add FRAME_ALIGN() to the architecture vector. If that | |
404 | fails, try unwind_dummy_id(). | |
405 | ||
406 | If the ABI specifies a "Red Zone" (see the doco) the code | |
407 | below will quietly trash it. */ | |
ebc7896c AC |
408 | sp = old_sp; |
409 | } | |
04714b91 | 410 | |
04714b91 AC |
411 | funaddr = find_function_addr (function, &value_type); |
412 | CHECK_TYPEDEF (value_type); | |
413 | ||
414 | { | |
415 | struct block *b = block_for_pc (funaddr); | |
416 | /* If compiled without -g, assume GCC 2. */ | |
417 | using_gcc = (b == NULL ? 2 : BLOCK_GCC_COMPILED (b)); | |
418 | } | |
419 | ||
420 | /* Are we returning a value using a structure return or a normal | |
421 | value return? */ | |
422 | ||
48436ce6 | 423 | struct_return = using_struct_return (value_type, using_gcc); |
04714b91 | 424 | |
7043d8dc AC |
425 | /* Determine the location of the breakpoint (and possibly other |
426 | stuff) that the called function will return to. The SPARC, for a | |
427 | function returning a structure or union, needs to make space for | |
428 | not just the breakpoint but also an extra word containing the | |
429 | size (?) of the structure being passed. */ | |
430 | ||
431 | /* The actual breakpoint (at BP_ADDR) is inserted separatly so there | |
432 | is no need to write that out. */ | |
433 | ||
04714b91 AC |
434 | switch (CALL_DUMMY_LOCATION) |
435 | { | |
436 | case ON_STACK: | |
7043d8dc AC |
437 | /* "dummy_addr" is here just to keep old targets happy. New |
438 | targets return that same information via "sp" and "bp_addr". */ | |
439 | if (INNER_THAN (1, 2)) | |
d585e13a | 440 | { |
7043d8dc AC |
441 | sp = push_dummy_code (current_gdbarch, sp, funaddr, |
442 | using_gcc, args, nargs, value_type, | |
443 | &real_pc, &bp_addr); | |
444 | dummy_addr = sp; | |
d585e13a | 445 | } |
7043d8dc AC |
446 | else |
447 | { | |
448 | dummy_addr = sp; | |
449 | sp = push_dummy_code (current_gdbarch, sp, funaddr, | |
450 | using_gcc, args, nargs, value_type, | |
451 | &real_pc, &bp_addr); | |
452 | } | |
453 | break; | |
04714b91 AC |
454 | case AT_ENTRY_POINT: |
455 | real_pc = funaddr; | |
88a82a65 | 456 | dummy_addr = entry_point_address (); |
0285512f AC |
457 | /* Make certain that the address points at real code, and not a |
458 | function descriptor. */ | |
e2d0e7eb AC |
459 | dummy_addr = gdbarch_convert_from_func_ptr_addr (current_gdbarch, |
460 | dummy_addr, | |
461 | ¤t_target); | |
d585e13a AC |
462 | /* A call dummy always consists of just a single breakpoint, so |
463 | it's address is the same as the address of the dummy. */ | |
464 | bp_addr = dummy_addr; | |
04714b91 | 465 | break; |
9710e734 AC |
466 | case AT_SYMBOL: |
467 | /* Some executables define a symbol __CALL_DUMMY_ADDRESS whose | |
468 | address is the location where the breakpoint should be | |
469 | placed. Once all targets are using the overhauled frame code | |
470 | this can be deleted - ON_STACK is a better option. */ | |
471 | { | |
472 | struct minimal_symbol *sym; | |
473 | ||
474 | sym = lookup_minimal_symbol ("__CALL_DUMMY_ADDRESS", NULL, NULL); | |
475 | real_pc = funaddr; | |
476 | if (sym) | |
477 | dummy_addr = SYMBOL_VALUE_ADDRESS (sym); | |
478 | else | |
479 | dummy_addr = entry_point_address (); | |
0285512f AC |
480 | /* Make certain that the address points at real code, and not |
481 | a function descriptor. */ | |
e2d0e7eb AC |
482 | dummy_addr = gdbarch_convert_from_func_ptr_addr (current_gdbarch, |
483 | dummy_addr, | |
484 | ¤t_target); | |
0285512f AC |
485 | /* A call dummy always consists of just a single breakpoint, |
486 | so it's address is the same as the address of the dummy. */ | |
9710e734 AC |
487 | bp_addr = dummy_addr; |
488 | break; | |
489 | } | |
04714b91 AC |
490 | default: |
491 | internal_error (__FILE__, __LINE__, "bad switch"); | |
492 | } | |
493 | ||
7a882905 AC |
494 | /* Save where the breakpoint is going to be inserted so that the |
495 | dummy-frame code is later able to re-identify it. */ | |
496 | generic_save_call_dummy_addr (bp_addr, bp_addr + 1); | |
7043d8dc | 497 | |
04714b91 AC |
498 | if (nargs < TYPE_NFIELDS (ftype)) |
499 | error ("too few arguments in function call"); | |
500 | ||
ebc7896c AC |
501 | { |
502 | int i; | |
503 | for (i = nargs - 1; i >= 0; i--) | |
504 | { | |
505 | int prototyped; | |
506 | struct type *param_type; | |
507 | ||
508 | /* FIXME drow/2002-05-31: Should just always mark methods as | |
509 | prototyped. Can we respect TYPE_VARARGS? Probably not. */ | |
510 | if (TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
511 | prototyped = 1; | |
512 | else if (i < TYPE_NFIELDS (ftype)) | |
513 | prototyped = TYPE_PROTOTYPED (ftype); | |
514 | else | |
515 | prototyped = 0; | |
516 | ||
517 | if (i < TYPE_NFIELDS (ftype)) | |
518 | param_type = TYPE_FIELD_TYPE (ftype, i); | |
519 | else | |
520 | param_type = NULL; | |
521 | ||
522 | args[i] = value_arg_coerce (args[i], param_type, prototyped); | |
523 | ||
524 | /* elz: this code is to handle the case in which the function | |
525 | to be called has a pointer to function as parameter and the | |
526 | corresponding actual argument is the address of a function | |
527 | and not a pointer to function variable. In aCC compiled | |
528 | code, the calls through pointers to functions (in the body | |
529 | of the function called by hand) are made via | |
530 | $$dyncall_external which requires some registers setting, | |
531 | this is taken care of if we call via a function pointer | |
532 | variable, but not via a function address. In cc this is | |
533 | not a problem. */ | |
534 | ||
535 | if (using_gcc == 0) | |
536 | { | |
537 | if (param_type != NULL && TYPE_CODE (ftype) != TYPE_CODE_METHOD) | |
538 | { | |
539 | /* if this parameter is a pointer to function. */ | |
540 | if (TYPE_CODE (param_type) == TYPE_CODE_PTR) | |
541 | if (TYPE_CODE (TYPE_TARGET_TYPE (param_type)) == TYPE_CODE_FUNC) | |
542 | /* elz: FIXME here should go the test about the | |
543 | compiler used to compile the target. We want to | |
544 | issue the error message only if the compiler | |
545 | used was HP's aCC. If we used HP's cc, then | |
546 | there is no problem and no need to return at | |
547 | this point. */ | |
548 | /* Go see if the actual parameter is a variable of | |
549 | type pointer to function or just a function. */ | |
550 | if (args[i]->lval == not_lval) | |
551 | { | |
552 | char *arg_name; | |
553 | if (find_pc_partial_function ((CORE_ADDR) args[i]->aligner.contents[0], &arg_name, NULL, NULL)) | |
554 | error ("\ | |
04714b91 AC |
555 | You cannot use function <%s> as argument. \n\ |
556 | You must use a pointer to function type variable. Command ignored.", arg_name); | |
ebc7896c AC |
557 | } |
558 | } | |
559 | } | |
560 | } | |
561 | } | |
04714b91 | 562 | |
8e823e25 | 563 | if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()) |
04714b91 | 564 | { |
ebc7896c | 565 | int i; |
04714b91 AC |
566 | /* This is a machine like the sparc, where we may need to pass a |
567 | pointer to the structure, not the structure itself. */ | |
568 | for (i = nargs - 1; i >= 0; i--) | |
569 | { | |
570 | struct type *arg_type = check_typedef (VALUE_TYPE (args[i])); | |
571 | if ((TYPE_CODE (arg_type) == TYPE_CODE_STRUCT | |
572 | || TYPE_CODE (arg_type) == TYPE_CODE_UNION | |
573 | || TYPE_CODE (arg_type) == TYPE_CODE_ARRAY | |
574 | || TYPE_CODE (arg_type) == TYPE_CODE_STRING | |
575 | || TYPE_CODE (arg_type) == TYPE_CODE_BITSTRING | |
576 | || TYPE_CODE (arg_type) == TYPE_CODE_SET | |
577 | || (TYPE_CODE (arg_type) == TYPE_CODE_FLT | |
578 | && TYPE_LENGTH (arg_type) > 8) | |
579 | ) | |
8e823e25 | 580 | && DEPRECATED_REG_STRUCT_HAS_ADDR (using_gcc, arg_type)) |
04714b91 AC |
581 | { |
582 | CORE_ADDR addr; | |
583 | int len; /* = TYPE_LENGTH (arg_type); */ | |
584 | int aligned_len; | |
585 | arg_type = check_typedef (VALUE_ENCLOSING_TYPE (args[i])); | |
586 | len = TYPE_LENGTH (arg_type); | |
587 | ||
f27dd7fd | 588 | if (DEPRECATED_STACK_ALIGN_P ()) |
04714b91 AC |
589 | /* MVS 11/22/96: I think at least some of this |
590 | stack_align code is really broken. Better to let | |
591 | PUSH_ARGUMENTS adjust the stack in a target-defined | |
592 | manner. */ | |
f27dd7fd | 593 | aligned_len = DEPRECATED_STACK_ALIGN (len); |
04714b91 AC |
594 | else |
595 | aligned_len = len; | |
596 | if (INNER_THAN (1, 2)) | |
597 | { | |
598 | /* stack grows downward */ | |
599 | sp -= aligned_len; | |
600 | /* ... so the address of the thing we push is the | |
601 | stack pointer after we push it. */ | |
602 | addr = sp; | |
603 | } | |
604 | else | |
605 | { | |
606 | /* The stack grows up, so the address of the thing | |
607 | we push is the stack pointer before we push it. */ | |
608 | addr = sp; | |
609 | sp += aligned_len; | |
610 | } | |
611 | /* Push the structure. */ | |
612 | write_memory (addr, VALUE_CONTENTS_ALL (args[i]), len); | |
613 | /* The value we're going to pass is the address of the | |
614 | thing we just pushed. */ | |
615 | /*args[i] = value_from_longest (lookup_pointer_type (value_type), | |
616 | (LONGEST) addr); */ | |
617 | args[i] = value_from_pointer (lookup_pointer_type (arg_type), | |
618 | addr); | |
619 | } | |
620 | } | |
621 | } | |
622 | ||
623 | ||
624 | /* Reserve space for the return structure to be written on the | |
625 | stack, if necessary. Make certain that the value is correctly | |
626 | aligned. */ | |
627 | ||
628 | if (struct_return) | |
629 | { | |
630 | int len = TYPE_LENGTH (value_type); | |
f27dd7fd | 631 | if (DEPRECATED_STACK_ALIGN_P ()) |
04714b91 AC |
632 | /* NOTE: cagney/2003-03-22: Should rely on frame align, rather |
633 | than stack align to force the alignment of the stack. */ | |
f27dd7fd | 634 | len = DEPRECATED_STACK_ALIGN (len); |
04714b91 AC |
635 | if (INNER_THAN (1, 2)) |
636 | { | |
637 | /* Stack grows downward. Align STRUCT_ADDR and SP after | |
638 | making space for the return value. */ | |
639 | sp -= len; | |
640 | if (gdbarch_frame_align_p (current_gdbarch)) | |
641 | sp = gdbarch_frame_align (current_gdbarch, sp); | |
642 | struct_addr = sp; | |
643 | } | |
644 | else | |
645 | { | |
646 | /* Stack grows upward. Align the frame, allocate space, and | |
647 | then again, re-align the frame??? */ | |
648 | if (gdbarch_frame_align_p (current_gdbarch)) | |
649 | sp = gdbarch_frame_align (current_gdbarch, sp); | |
650 | struct_addr = sp; | |
651 | sp += len; | |
652 | if (gdbarch_frame_align_p (current_gdbarch)) | |
653 | sp = gdbarch_frame_align (current_gdbarch, sp); | |
654 | } | |
655 | } | |
656 | ||
04714b91 AC |
657 | /* Create the dummy stack frame. Pass in the call dummy address as, |
658 | presumably, the ABI code knows where, in the call dummy, the | |
659 | return address should be pointed. */ | |
660 | if (gdbarch_push_dummy_call_p (current_gdbarch)) | |
661 | /* When there is no push_dummy_call method, should this code | |
662 | simply error out. That would the implementation of this method | |
663 | for all ABIs (which is probably a good thing). */ | |
7d9b040b | 664 | sp = gdbarch_push_dummy_call (current_gdbarch, function, current_regcache, |
7043d8dc | 665 | bp_addr, nargs, args, sp, struct_return, |
04714b91 AC |
666 | struct_addr); |
667 | else if (DEPRECATED_PUSH_ARGUMENTS_P ()) | |
668 | /* Keep old targets working. */ | |
669 | sp = DEPRECATED_PUSH_ARGUMENTS (nargs, args, sp, struct_return, | |
670 | struct_addr); | |
671 | else | |
672 | sp = legacy_push_arguments (nargs, args, sp, struct_return, struct_addr); | |
673 | ||
674 | if (DEPRECATED_PUSH_RETURN_ADDRESS_P ()) | |
675 | /* for targets that use no CALL_DUMMY */ | |
676 | /* There are a number of targets now which actually don't write | |
677 | any CALL_DUMMY instructions into the target, but instead just | |
678 | save the machine state, push the arguments, and jump directly | |
679 | to the callee function. Since this doesn't actually involve | |
680 | executing a JSR/BSR instruction, the return address must be set | |
681 | up by hand, either by pushing onto the stack or copying into a | |
682 | return-address register as appropriate. Formerly this has been | |
683 | done in PUSH_ARGUMENTS, but that's overloading its | |
684 | functionality a bit, so I'm making it explicit to do it here. */ | |
d585e13a AC |
685 | /* NOTE: cagney/2003-04-22: The first parameter ("real_pc") has |
686 | been replaced with zero, it turns out that no implementation | |
687 | used that parameter. This occured because the value being | |
688 | supplied - the address of the called function's entry point | |
689 | instead of the address of the breakpoint that the called | |
690 | function should return to - wasn't useful. */ | |
691 | sp = DEPRECATED_PUSH_RETURN_ADDRESS (0, sp); | |
04714b91 AC |
692 | |
693 | /* NOTE: cagney/2003-03-23: Diable this code when there is a | |
694 | push_dummy_call() method. Since that method will have already | |
695 | handled any alignment issues, the code below is entirely | |
696 | redundant. */ | |
697 | if (!gdbarch_push_dummy_call_p (current_gdbarch) | |
f27dd7fd | 698 | && DEPRECATED_STACK_ALIGN_P () && !INNER_THAN (1, 2)) |
04714b91 AC |
699 | { |
700 | /* If stack grows up, we must leave a hole at the bottom, note | |
701 | that sp already has been advanced for the arguments! */ | |
f27dd7fd | 702 | sp = DEPRECATED_STACK_ALIGN (sp); |
04714b91 AC |
703 | } |
704 | ||
04714b91 AC |
705 | /* Store the address at which the structure is supposed to be |
706 | written. */ | |
707 | /* NOTE: 2003-03-24: Since PUSH_ARGUMENTS can (and typically does) | |
708 | store the struct return address, this call is entirely redundant. */ | |
709 | if (struct_return && DEPRECATED_STORE_STRUCT_RETURN_P ()) | |
710 | DEPRECATED_STORE_STRUCT_RETURN (struct_addr, sp); | |
711 | ||
1fd4ae22 AC |
712 | /* Write the stack pointer. This is here because the statements |
713 | above might fool with it. On SPARC, this write also stores the | |
714 | register window into the right place in the new stack frame, | |
715 | which otherwise wouldn't happen (see store_inferior_registers in | |
716 | sparc-nat.c). */ | |
717 | /* NOTE: cagney/2003-03-23: Since the architecture method | |
718 | push_dummy_call() should have already stored the stack pointer | |
719 | (as part of creating the fake call frame), and none of the code | |
720 | following that call adjusts the stack-pointer value, the below | |
721 | call is entirely redundant. */ | |
04714b91 AC |
722 | if (DEPRECATED_DUMMY_WRITE_SP_P ()) |
723 | DEPRECATED_DUMMY_WRITE_SP (sp); | |
724 | ||
1ac839b8 | 725 | if (DEPRECATED_SAVE_DUMMY_FRAME_TOS_P ()) |
a59fe496 | 726 | DEPRECATED_SAVE_DUMMY_FRAME_TOS (sp); |
1ac839b8 AC |
727 | else |
728 | /* Sanity. The exact same SP value is returned by | |
729 | PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by | |
730 | unwind_dummy_id to form the frame ID's stack address. */ | |
731 | generic_save_dummy_frame_tos (sp); | |
04714b91 | 732 | |
74cfe982 AC |
733 | /* Now proceed, having reached the desired place. */ |
734 | clear_proceed_status (); | |
735 | ||
736 | /* Create a momentary breakpoint at the return address of the | |
737 | inferior. That way it breaks when it returns. */ | |
04714b91 | 738 | |
74cfe982 AC |
739 | { |
740 | struct breakpoint *bpt; | |
741 | struct symtab_and_line sal; | |
742 | struct frame_id frame; | |
743 | init_sal (&sal); /* initialize to zeroes */ | |
744 | sal.pc = bp_addr; | |
745 | sal.section = find_pc_overlay (sal.pc); | |
746 | /* Set up a frame ID for the dummy frame so we can pass it to | |
747 | set_momentary_breakpoint. We need to give the breakpoint a | |
0ba6dca9 AC |
748 | frame ID so that the breakpoint code can correctly re-identify |
749 | the dummy breakpoint. */ | |
3e210248 AC |
750 | if (gdbarch_unwind_dummy_id_p (current_gdbarch)) |
751 | { | |
752 | /* Sanity. The exact same SP value is returned by | |
753 | PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by | |
754 | unwind_dummy_id to form the frame ID's stack address. */ | |
3e210248 AC |
755 | frame = frame_id_build (sp, sal.pc); |
756 | } | |
0ba6dca9 | 757 | else |
3e210248 AC |
758 | { |
759 | /* The assumption here is that push_dummy_call() returned the | |
ce2826aa | 760 | stack part of the frame ID. Unfortunately, many older |
3e210248 AC |
761 | architectures were, via a convoluted mess, relying on the |
762 | poorly defined and greatly overloaded | |
763 | DEPRECATED_TARGET_READ_FP or DEPRECATED_FP_REGNUM to supply | |
764 | the value. */ | |
765 | if (DEPRECATED_TARGET_READ_FP_P ()) | |
766 | frame = frame_id_build (DEPRECATED_TARGET_READ_FP (), sal.pc); | |
767 | else if (DEPRECATED_FP_REGNUM >= 0) | |
768 | frame = frame_id_build (read_register (DEPRECATED_FP_REGNUM), sal.pc); | |
769 | else | |
770 | frame = frame_id_build (sp, sal.pc); | |
771 | } | |
74cfe982 AC |
772 | bpt = set_momentary_breakpoint (sal, frame, bp_call_dummy); |
773 | bpt->disposition = disp_del; | |
774 | } | |
04714b91 | 775 | |
74cfe982 AC |
776 | /* Execute a "stack dummy", a piece of code stored in the stack by |
777 | the debugger to be executed in the inferior. | |
04714b91 | 778 | |
74cfe982 AC |
779 | The dummy's frame is automatically popped whenever that break is |
780 | hit. If that is the first time the program stops, | |
781 | call_function_by_hand returns to its caller with that frame | |
782 | already gone and sets RC to 0. | |
783 | ||
784 | Otherwise, set RC to a non-zero value. If the called function | |
785 | receives a random signal, we do not allow the user to continue | |
786 | executing it as this may not work. The dummy frame is poped and | |
787 | we return 1. If we hit a breakpoint, we leave the frame in place | |
788 | and return 2 (the frame will eventually be popped when we do hit | |
789 | the dummy end breakpoint). */ | |
04714b91 | 790 | |
74cfe982 AC |
791 | { |
792 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, 0); | |
793 | int saved_async = 0; | |
794 | ||
795 | /* If all error()s out of proceed ended up calling normal_stop | |
796 | (and perhaps they should; it already does in the special case | |
797 | of error out of resume()), then we wouldn't need this. */ | |
798 | make_cleanup (breakpoint_auto_delete_contents, &stop_bpstat); | |
799 | ||
800 | disable_watchpoints_before_interactive_call_start (); | |
801 | proceed_to_finish = 1; /* We want stop_registers, please... */ | |
802 | ||
803 | if (target_can_async_p ()) | |
804 | saved_async = target_async_mask (0); | |
805 | ||
806 | proceed (real_pc, TARGET_SIGNAL_0, 0); | |
807 | ||
808 | if (saved_async) | |
809 | target_async_mask (saved_async); | |
810 | ||
811 | enable_watchpoints_after_interactive_call_stop (); | |
04714b91 | 812 | |
74cfe982 | 813 | discard_cleanups (old_cleanups); |
52557533 | 814 | } |
04714b91 | 815 | |
52557533 AC |
816 | if (stopped_by_random_signal || !stop_stack_dummy) |
817 | { | |
818 | /* Find the name of the function we're about to complain about. */ | |
edcf254d | 819 | const char *name = NULL; |
04714b91 | 820 | { |
52557533 AC |
821 | struct symbol *symbol = find_pc_function (funaddr); |
822 | if (symbol) | |
823 | name = SYMBOL_PRINT_NAME (symbol); | |
824 | else | |
04714b91 | 825 | { |
52557533 AC |
826 | /* Try the minimal symbols. */ |
827 | struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (funaddr); | |
828 | if (msymbol) | |
829 | name = SYMBOL_PRINT_NAME (msymbol); | |
830 | } | |
edcf254d AC |
831 | if (name == NULL) |
832 | { | |
833 | /* Can't use a cleanup here. It is discarded, instead use | |
834 | an alloca. */ | |
835 | char *tmp = xstrprintf ("at %s", local_hex_string (funaddr)); | |
836 | char *a = alloca (strlen (tmp) + 1); | |
837 | strcpy (a, tmp); | |
838 | xfree (tmp); | |
839 | name = a; | |
840 | } | |
52557533 | 841 | } |
52557533 AC |
842 | if (stopped_by_random_signal) |
843 | { | |
844 | /* We stopped inside the FUNCTION because of a random | |
845 | signal. Further execution of the FUNCTION is not | |
846 | allowed. */ | |
04714b91 | 847 | |
52557533 AC |
848 | if (unwind_on_signal_p) |
849 | { | |
850 | /* The user wants the context restored. */ | |
851 | ||
852 | /* We must get back to the frame we were before the | |
853 | dummy call. */ | |
854 | frame_pop (get_current_frame ()); | |
04714b91 | 855 | |
52557533 AC |
856 | /* FIXME: Insert a bunch of wrap_here; name can be very |
857 | long if it's a C++ name with arguments and stuff. */ | |
858 | error ("\ | |
04714b91 AC |
859 | The program being debugged was signaled while in a function called from GDB.\n\ |
860 | GDB has restored the context to what it was before the call.\n\ | |
861 | To change this behavior use \"set unwindonsignal off\"\n\ | |
862 | Evaluation of the expression containing the function (%s) will be abandoned.", | |
52557533 AC |
863 | name); |
864 | } | |
865 | else | |
866 | { | |
867 | /* The user wants to stay in the frame where we stopped | |
868 | (default).*/ | |
869 | /* If we restored the inferior status (via the cleanup), | |
870 | we would print a spurious error message (Unable to | |
871 | restore previously selected frame), would write the | |
872 | registers from the inf_status (which is wrong), and | |
873 | would do other wrong things. */ | |
874 | discard_cleanups (inf_status_cleanup); | |
875 | discard_inferior_status (inf_status); | |
876 | /* FIXME: Insert a bunch of wrap_here; name can be very | |
877 | long if it's a C++ name with arguments and stuff. */ | |
878 | error ("\ | |
04714b91 AC |
879 | The program being debugged was signaled while in a function called from GDB.\n\ |
880 | GDB remains in the frame where the signal was received.\n\ | |
881 | To change this behavior use \"set unwindonsignal on\"\n\ | |
882 | Evaluation of the expression containing the function (%s) will be abandoned.", | |
52557533 AC |
883 | name); |
884 | } | |
885 | } | |
04714b91 | 886 | |
52557533 AC |
887 | if (!stop_stack_dummy) |
888 | { | |
889 | /* We hit a breakpoint inside the FUNCTION. */ | |
890 | /* If we restored the inferior status (via the cleanup), we | |
891 | would print a spurious error message (Unable to restore | |
892 | previously selected frame), would write the registers | |
893 | from the inf_status (which is wrong), and would do other | |
894 | wrong things. */ | |
895 | discard_cleanups (inf_status_cleanup); | |
896 | discard_inferior_status (inf_status); | |
897 | /* The following error message used to say "The expression | |
898 | which contained the function call has been discarded." | |
899 | It is a hard concept to explain in a few words. Ideally, | |
900 | GDB would be able to resume evaluation of the expression | |
901 | when the function finally is done executing. Perhaps | |
902 | someday this will be implemented (it would not be easy). */ | |
903 | /* FIXME: Insert a bunch of wrap_here; name can be very long if it's | |
904 | a C++ name with arguments and stuff. */ | |
905 | error ("\ | |
04714b91 AC |
906 | The program being debugged stopped while in a function called from GDB.\n\ |
907 | When the function (%s) is done executing, GDB will silently\n\ | |
908 | stop (instead of continuing to evaluate the expression containing\n\ | |
909 | the function call).", name); | |
52557533 AC |
910 | } |
911 | ||
912 | /* The above code errors out, so ... */ | |
913 | internal_error (__FILE__, __LINE__, "... should not be here"); | |
914 | } | |
04714b91 | 915 | |
74cfe982 AC |
916 | /* If we get here the called FUNCTION run to completion. */ |
917 | ||
918 | /* On normal return, the stack dummy has been popped already. */ | |
919 | regcache_cpy_no_passthrough (retbuf, stop_registers); | |
920 | ||
921 | /* Restore the inferior status, via its cleanup. At this stage, | |
922 | leave the RETBUF alone. */ | |
923 | do_cleanups (inf_status_cleanup); | |
924 | ||
925 | /* Figure out the value returned by the function. */ | |
64f395bf | 926 | if (struct_return) |
74cfe982 | 927 | { |
64f395bf AC |
928 | /* NOTE: cagney/2003-09-27: This assumes that PUSH_DUMMY_CALL |
929 | has correctly stored STRUCT_ADDR in the target. In the past | |
930 | that hasn't been the case, the old MIPS PUSH_ARGUMENTS | |
931 | (PUSH_DUMMY_CALL precursor) would silently move the location | |
932 | of the struct return value making STRUCT_ADDR bogus. If | |
933 | you're seeing problems with values being returned using the | |
934 | "struct return convention", check that PUSH_DUMMY_CALL isn't | |
935 | playing tricks. */ | |
74cfe982 AC |
936 | struct value *retval = value_at (value_type, struct_addr, NULL); |
937 | do_cleanups (retbuf_cleanup); | |
938 | return retval; | |
939 | } | |
940 | else | |
941 | { | |
5fe830e4 AC |
942 | /* The non-register case was handled above. */ |
943 | struct value *retval = register_value_being_returned (value_type, | |
944 | retbuf); | |
74cfe982 AC |
945 | do_cleanups (retbuf_cleanup); |
946 | return retval; | |
947 | } | |
04714b91 AC |
948 | } |
949 | ||
950 | void _initialize_infcall (void); | |
951 | ||
952 | void | |
953 | _initialize_infcall (void) | |
954 | { | |
955 | add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure, | |
956 | &coerce_float_to_double_p, "\ | |
957 | Set coercion of floats to doubles when calling functions\n\ | |
958 | Variables of type float should generally be converted to doubles before\n\ | |
959 | calling an unprototyped function, and left alone when calling a prototyped\n\ | |
960 | function. However, some older debug info formats do not provide enough\n\ | |
961 | information to determine that a function is prototyped. If this flag is\n\ | |
962 | set, GDB will perform the conversion for a function it considers\n\ | |
963 | unprototyped.\n\ | |
964 | The default is to perform the conversion.\n", "\ | |
965 | Show coercion of floats to doubles when calling functions\n\ | |
966 | Variables of type float should generally be converted to doubles before\n\ | |
967 | calling an unprototyped function, and left alone when calling a prototyped\n\ | |
968 | function. However, some older debug info formats do not provide enough\n\ | |
969 | information to determine that a function is prototyped. If this flag is\n\ | |
970 | set, GDB will perform the conversion for a function it considers\n\ | |
971 | unprototyped.\n\ | |
972 | The default is to perform the conversion.\n", | |
973 | NULL, NULL, &setlist, &showlist); | |
974 | ||
975 | add_setshow_boolean_cmd ("unwindonsignal", no_class, | |
976 | &unwind_on_signal_p, "\ | |
977 | Set unwinding of stack if a signal is received while in a call dummy.\n\ | |
978 | The unwindonsignal lets the user determine what gdb should do if a signal\n\ | |
979 | is received while in a function called from gdb (call dummy). If set, gdb\n\ | |
980 | unwinds the stack and restore the context to what as it was before the call.\n\ | |
981 | The default is to stop in the frame where the signal was received.", "\ | |
1d3056ac | 982 | Show unwinding of stack if a signal is received while in a call dummy.\n\ |
04714b91 AC |
983 | The unwindonsignal lets the user determine what gdb should do if a signal\n\ |
984 | is received while in a function called from gdb (call dummy). If set, gdb\n\ | |
985 | unwinds the stack and restore the context to what as it was before the call.\n\ | |
986 | The default is to stop in the frame where the signal was received.", | |
987 | NULL, NULL, &setlist, &showlist); | |
988 | } |