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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" |
96860204 | 38 | #include "dummy-frame.h" |
04714b91 AC |
39 | |
40 | /* NOTE: cagney/2003-04-16: What's the future of this code? | |
41 | ||
42 | GDB needs an asynchronous expression evaluator, that means an | |
43 | asynchronous inferior function call implementation, and that in | |
44 | turn means restructuring the code so that it is event driven. */ | |
45 | ||
46 | /* How you should pass arguments to a function depends on whether it | |
47 | was defined in K&R style or prototype style. If you define a | |
48 | function using the K&R syntax that takes a `float' argument, then | |
49 | callers must pass that argument as a `double'. If you define the | |
50 | function using the prototype syntax, then you must pass the | |
51 | argument as a `float', with no promotion. | |
52 | ||
53 | Unfortunately, on certain older platforms, the debug info doesn't | |
54 | indicate reliably how each function was defined. A function type's | |
55 | TYPE_FLAG_PROTOTYPED flag may be clear, even if the function was | |
56 | defined in prototype style. When calling a function whose | |
57 | TYPE_FLAG_PROTOTYPED flag is clear, GDB consults this flag to | |
58 | decide what to do. | |
59 | ||
60 | For modern targets, it is proper to assume that, if the prototype | |
61 | flag is clear, that can be trusted: `float' arguments should be | |
62 | promoted to `double'. For some older targets, if the prototype | |
63 | flag is clear, that doesn't tell us anything. The default is to | |
64 | trust the debug information; the user can override this behavior | |
65 | with "set coerce-float-to-double 0". */ | |
66 | ||
67 | static int coerce_float_to_double_p = 1; | |
68 | ||
69 | /* This boolean tells what gdb should do if a signal is received while | |
70 | in a function called from gdb (call dummy). If set, gdb unwinds | |
71 | the stack and restore the context to what as it was before the | |
72 | call. | |
73 | ||
74 | The default is to stop in the frame where the signal was received. */ | |
75 | ||
76 | int unwind_on_signal_p = 0; | |
77 | ||
78 | /* Perform the standard coercions that are specified | |
79 | for arguments to be passed to C functions. | |
80 | ||
81 | If PARAM_TYPE is non-NULL, it is the expected parameter type. | |
82 | IS_PROTOTYPED is non-zero if the function declaration is prototyped. */ | |
83 | ||
84 | static struct value * | |
85 | value_arg_coerce (struct value *arg, struct type *param_type, | |
86 | int is_prototyped) | |
87 | { | |
df407dfe | 88 | struct type *arg_type = check_typedef (value_type (arg)); |
52f0bd74 | 89 | struct type *type |
04714b91 AC |
90 | = param_type ? check_typedef (param_type) : arg_type; |
91 | ||
92 | switch (TYPE_CODE (type)) | |
93 | { | |
94 | case TYPE_CODE_REF: | |
95 | if (TYPE_CODE (arg_type) != TYPE_CODE_REF | |
96 | && TYPE_CODE (arg_type) != TYPE_CODE_PTR) | |
97 | { | |
98 | arg = value_addr (arg); | |
df407dfe | 99 | arg->type = param_type; |
04714b91 AC |
100 | return arg; |
101 | } | |
102 | break; | |
103 | case TYPE_CODE_INT: | |
104 | case TYPE_CODE_CHAR: | |
105 | case TYPE_CODE_BOOL: | |
106 | case TYPE_CODE_ENUM: | |
107 | /* If we don't have a prototype, coerce to integer type if necessary. */ | |
108 | if (!is_prototyped) | |
109 | { | |
110 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int)) | |
111 | type = builtin_type_int; | |
112 | } | |
113 | /* Currently all target ABIs require at least the width of an integer | |
114 | type for an argument. We may have to conditionalize the following | |
115 | type coercion for future targets. */ | |
116 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int)) | |
117 | type = builtin_type_int; | |
118 | break; | |
119 | case TYPE_CODE_FLT: | |
120 | if (!is_prototyped && coerce_float_to_double_p) | |
121 | { | |
122 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_double)) | |
123 | type = builtin_type_double; | |
124 | else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin_type_double)) | |
125 | type = builtin_type_long_double; | |
126 | } | |
127 | break; | |
128 | case TYPE_CODE_FUNC: | |
129 | type = lookup_pointer_type (type); | |
130 | break; | |
131 | case TYPE_CODE_ARRAY: | |
132 | /* Arrays are coerced to pointers to their first element, unless | |
133 | they are vectors, in which case we want to leave them alone, | |
134 | because they are passed by value. */ | |
135 | if (current_language->c_style_arrays) | |
136 | if (!TYPE_VECTOR (type)) | |
137 | type = lookup_pointer_type (TYPE_TARGET_TYPE (type)); | |
138 | break; | |
139 | case TYPE_CODE_UNDEF: | |
140 | case TYPE_CODE_PTR: | |
141 | case TYPE_CODE_STRUCT: | |
142 | case TYPE_CODE_UNION: | |
143 | case TYPE_CODE_VOID: | |
144 | case TYPE_CODE_SET: | |
145 | case TYPE_CODE_RANGE: | |
146 | case TYPE_CODE_STRING: | |
147 | case TYPE_CODE_BITSTRING: | |
148 | case TYPE_CODE_ERROR: | |
149 | case TYPE_CODE_MEMBER: | |
150 | case TYPE_CODE_METHOD: | |
151 | case TYPE_CODE_COMPLEX: | |
152 | default: | |
153 | break; | |
154 | } | |
155 | ||
156 | return value_cast (type, arg); | |
157 | } | |
158 | ||
159 | /* Determine a function's address and its return type from its value. | |
160 | Calls error() if the function is not valid for calling. */ | |
161 | ||
a9fa03de | 162 | CORE_ADDR |
04714b91 AC |
163 | find_function_addr (struct value *function, struct type **retval_type) |
164 | { | |
df407dfe | 165 | struct type *ftype = check_typedef (value_type (function)); |
52f0bd74 | 166 | enum type_code code = TYPE_CODE (ftype); |
04714b91 AC |
167 | struct type *value_type; |
168 | CORE_ADDR funaddr; | |
169 | ||
170 | /* If it's a member function, just look at the function | |
171 | part of it. */ | |
172 | ||
173 | /* Determine address to call. */ | |
174 | if (code == TYPE_CODE_FUNC || code == TYPE_CODE_METHOD) | |
175 | { | |
176 | funaddr = VALUE_ADDRESS (function); | |
177 | value_type = TYPE_TARGET_TYPE (ftype); | |
178 | } | |
179 | else if (code == TYPE_CODE_PTR) | |
180 | { | |
181 | funaddr = value_as_address (function); | |
182 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); | |
183 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC | |
184 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
185 | { | |
e2d0e7eb AC |
186 | funaddr = gdbarch_convert_from_func_ptr_addr (current_gdbarch, |
187 | funaddr, | |
188 | ¤t_target); | |
04714b91 AC |
189 | value_type = TYPE_TARGET_TYPE (ftype); |
190 | } | |
191 | else | |
192 | value_type = builtin_type_int; | |
193 | } | |
194 | else if (code == TYPE_CODE_INT) | |
195 | { | |
196 | /* Handle the case of functions lacking debugging info. | |
197 | Their values are characters since their addresses are char */ | |
198 | if (TYPE_LENGTH (ftype) == 1) | |
199 | funaddr = value_as_address (value_addr (function)); | |
200 | else | |
201 | /* Handle integer used as address of a function. */ | |
202 | funaddr = (CORE_ADDR) value_as_long (function); | |
203 | ||
204 | value_type = builtin_type_int; | |
205 | } | |
206 | else | |
207 | error ("Invalid data type for function to be called."); | |
208 | ||
7d9b040b RC |
209 | if (retval_type != NULL) |
210 | *retval_type = value_type; | |
782263ab | 211 | return funaddr + DEPRECATED_FUNCTION_START_OFFSET; |
04714b91 AC |
212 | } |
213 | ||
214 | /* Call breakpoint_auto_delete on the current contents of the bpstat | |
215 | pointed to by arg (which is really a bpstat *). */ | |
216 | ||
217 | static void | |
218 | breakpoint_auto_delete_contents (void *arg) | |
219 | { | |
220 | breakpoint_auto_delete (*(bpstat *) arg); | |
221 | } | |
222 | ||
7043d8dc AC |
223 | static CORE_ADDR |
224 | generic_push_dummy_code (struct gdbarch *gdbarch, | |
225 | CORE_ADDR sp, CORE_ADDR funaddr, int using_gcc, | |
226 | struct value **args, int nargs, | |
227 | struct type *value_type, | |
228 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr) | |
229 | { | |
230 | /* Something here to findout the size of a breakpoint and then | |
231 | allocate space for it on the stack. */ | |
232 | int bplen; | |
233 | /* This code assumes frame align. */ | |
234 | gdb_assert (gdbarch_frame_align_p (gdbarch)); | |
235 | /* Force the stack's alignment. The intent is to ensure that the SP | |
236 | is aligned to at least a breakpoint instruction's boundary. */ | |
237 | sp = gdbarch_frame_align (gdbarch, sp); | |
238 | /* Allocate space for, and then position the breakpoint on the | |
239 | stack. */ | |
240 | if (gdbarch_inner_than (gdbarch, 1, 2)) | |
241 | { | |
242 | CORE_ADDR bppc = sp; | |
243 | gdbarch_breakpoint_from_pc (gdbarch, &bppc, &bplen); | |
244 | sp = gdbarch_frame_align (gdbarch, sp - bplen); | |
245 | (*bp_addr) = sp; | |
246 | /* Should the breakpoint size/location be re-computed here? */ | |
247 | } | |
248 | else | |
249 | { | |
250 | (*bp_addr) = sp; | |
251 | gdbarch_breakpoint_from_pc (gdbarch, bp_addr, &bplen); | |
252 | sp = gdbarch_frame_align (gdbarch, sp + bplen); | |
253 | } | |
254 | /* Inferior resumes at the function entry point. */ | |
255 | (*real_pc) = funaddr; | |
256 | return sp; | |
257 | } | |
258 | ||
d3712828 AC |
259 | /* For CALL_DUMMY_ON_STACK, push a breakpoint sequence that the called |
260 | function returns to. */ | |
7043d8dc AC |
261 | |
262 | static CORE_ADDR | |
263 | push_dummy_code (struct gdbarch *gdbarch, | |
264 | CORE_ADDR sp, CORE_ADDR funaddr, int using_gcc, | |
265 | struct value **args, int nargs, | |
266 | struct type *value_type, | |
267 | CORE_ADDR *real_pc, CORE_ADDR *bp_addr) | |
268 | { | |
269 | if (gdbarch_push_dummy_code_p (gdbarch)) | |
270 | return gdbarch_push_dummy_code (gdbarch, sp, funaddr, using_gcc, | |
271 | args, nargs, value_type, real_pc, bp_addr); | |
7043d8dc AC |
272 | else |
273 | return generic_push_dummy_code (gdbarch, sp, funaddr, using_gcc, | |
274 | args, nargs, value_type, real_pc, bp_addr); | |
275 | } | |
276 | ||
04714b91 AC |
277 | /* All this stuff with a dummy frame may seem unnecessarily complicated |
278 | (why not just save registers in GDB?). The purpose of pushing a dummy | |
279 | frame which looks just like a real frame is so that if you call a | |
280 | function and then hit a breakpoint (get a signal, etc), "backtrace" | |
281 | will look right. Whether the backtrace needs to actually show the | |
282 | stack at the time the inferior function was called is debatable, but | |
283 | it certainly needs to not display garbage. So if you are contemplating | |
284 | making dummy frames be different from normal frames, consider that. */ | |
285 | ||
286 | /* Perform a function call in the inferior. | |
287 | ARGS is a vector of values of arguments (NARGS of them). | |
288 | FUNCTION is a value, the function to be called. | |
289 | Returns a value representing what the function returned. | |
290 | May fail to return, if a breakpoint or signal is hit | |
291 | during the execution of the function. | |
292 | ||
293 | ARGS is modified to contain coerced values. */ | |
294 | ||
295 | struct value * | |
296 | call_function_by_hand (struct value *function, int nargs, struct value **args) | |
297 | { | |
52f0bd74 | 298 | CORE_ADDR sp; |
04714b91 | 299 | CORE_ADDR dummy_addr; |
df407dfe | 300 | struct type *values_type; |
04714b91 AC |
301 | unsigned char struct_return; |
302 | CORE_ADDR struct_addr = 0; | |
303 | struct regcache *retbuf; | |
304 | struct cleanup *retbuf_cleanup; | |
305 | struct inferior_status *inf_status; | |
306 | struct cleanup *inf_status_cleanup; | |
307 | CORE_ADDR funaddr; | |
308 | int using_gcc; /* Set to version of gcc in use, or zero if not gcc */ | |
309 | CORE_ADDR real_pc; | |
df407dfe | 310 | struct type *ftype = check_typedef (value_type (function)); |
d585e13a | 311 | CORE_ADDR bp_addr; |
96860204 AC |
312 | struct regcache *caller_regcache; |
313 | struct cleanup *caller_regcache_cleanup; | |
314 | struct frame_id dummy_id; | |
04714b91 | 315 | |
04714b91 AC |
316 | if (!target_has_execution) |
317 | noprocess (); | |
318 | ||
319 | /* Create a cleanup chain that contains the retbuf (buffer | |
320 | containing the register values). This chain is create BEFORE the | |
321 | inf_status chain so that the inferior status can cleaned up | |
322 | (restored or discarded) without having the retbuf freed. */ | |
323 | retbuf = regcache_xmalloc (current_gdbarch); | |
324 | retbuf_cleanup = make_cleanup_regcache_xfree (retbuf); | |
325 | ||
326 | /* A cleanup for the inferior status. Create this AFTER the retbuf | |
327 | so that this can be discarded or applied without interfering with | |
328 | the regbuf. */ | |
329 | inf_status = save_inferior_status (1); | |
330 | inf_status_cleanup = make_cleanup_restore_inferior_status (inf_status); | |
331 | ||
96860204 AC |
332 | /* Save the caller's registers so that they can be restored once the |
333 | callee returns. To allow nested calls the registers are (further | |
334 | down) pushed onto a dummy frame stack. Include a cleanup (which | |
335 | is tossed once the regcache has been pushed). */ | |
336 | caller_regcache = frame_save_as_regcache (get_current_frame ()); | |
337 | caller_regcache_cleanup = make_cleanup_regcache_xfree (caller_regcache); | |
04714b91 | 338 | |
04714b91 | 339 | /* Ensure that the initial SP is correctly aligned. */ |
ebc7896c AC |
340 | { |
341 | CORE_ADDR old_sp = read_sp (); | |
342 | if (gdbarch_frame_align_p (current_gdbarch)) | |
343 | { | |
8b148df9 AC |
344 | sp = gdbarch_frame_align (current_gdbarch, old_sp); |
345 | /* NOTE: cagney/2003-08-13: Skip the "red zone". For some | |
346 | ABIs, a function can use memory beyond the inner most stack | |
347 | address. AMD64 called that region the "red zone". Skip at | |
348 | least the "red zone" size before allocating any space on | |
349 | the stack. */ | |
350 | if (INNER_THAN (1, 2)) | |
351 | sp -= gdbarch_frame_red_zone_size (current_gdbarch); | |
352 | else | |
353 | sp += gdbarch_frame_red_zone_size (current_gdbarch); | |
354 | /* Still aligned? */ | |
355 | gdb_assert (sp == gdbarch_frame_align (current_gdbarch, sp)); | |
ebc7896c AC |
356 | /* NOTE: cagney/2002-09-18: |
357 | ||
358 | On a RISC architecture, a void parameterless generic dummy | |
359 | frame (i.e., no parameters, no result) typically does not | |
360 | need to push anything the stack and hence can leave SP and | |
c48a845b | 361 | FP. Similarly, a frameless (possibly leaf) function does |
ebc7896c AC |
362 | not push anything on the stack and, hence, that too can |
363 | leave FP and SP unchanged. As a consequence, a sequence of | |
364 | void parameterless generic dummy frame calls to frameless | |
365 | functions will create a sequence of effectively identical | |
366 | frames (SP, FP and TOS and PC the same). This, not | |
367 | suprisingly, results in what appears to be a stack in an | |
368 | infinite loop --- when GDB tries to find a generic dummy | |
369 | frame on the internal dummy frame stack, it will always | |
370 | find the first one. | |
371 | ||
372 | To avoid this problem, the code below always grows the | |
373 | stack. That way, two dummy frames can never be identical. | |
374 | It does burn a few bytes of stack but that is a small price | |
375 | to pay :-). */ | |
ebc7896c AC |
376 | if (sp == old_sp) |
377 | { | |
378 | if (INNER_THAN (1, 2)) | |
379 | /* Stack grows down. */ | |
380 | sp = gdbarch_frame_align (current_gdbarch, old_sp - 1); | |
381 | else | |
382 | /* Stack grows up. */ | |
383 | sp = gdbarch_frame_align (current_gdbarch, old_sp + 1); | |
384 | } | |
385 | gdb_assert ((INNER_THAN (1, 2) && sp <= old_sp) | |
386 | || (INNER_THAN (2, 1) && sp >= old_sp)); | |
387 | } | |
388 | else | |
a59fe496 AC |
389 | /* FIXME: cagney/2002-09-18: Hey, you loose! |
390 | ||
8b148df9 AC |
391 | Who knows how badly aligned the SP is! |
392 | ||
393 | If the generic dummy frame ends up empty (because nothing is | |
394 | pushed) GDB won't be able to correctly perform back traces. | |
395 | If a target is having trouble with backtraces, first thing to | |
396 | do is add FRAME_ALIGN() to the architecture vector. If that | |
397 | fails, try unwind_dummy_id(). | |
398 | ||
399 | If the ABI specifies a "Red Zone" (see the doco) the code | |
400 | below will quietly trash it. */ | |
ebc7896c AC |
401 | sp = old_sp; |
402 | } | |
04714b91 | 403 | |
df407dfe AC |
404 | funaddr = find_function_addr (function, &values_type); |
405 | CHECK_TYPEDEF (values_type); | |
04714b91 AC |
406 | |
407 | { | |
408 | struct block *b = block_for_pc (funaddr); | |
409 | /* If compiled without -g, assume GCC 2. */ | |
410 | using_gcc = (b == NULL ? 2 : BLOCK_GCC_COMPILED (b)); | |
411 | } | |
412 | ||
413 | /* Are we returning a value using a structure return or a normal | |
414 | value return? */ | |
415 | ||
df407dfe | 416 | struct_return = using_struct_return (values_type, using_gcc); |
04714b91 | 417 | |
7043d8dc AC |
418 | /* Determine the location of the breakpoint (and possibly other |
419 | stuff) that the called function will return to. The SPARC, for a | |
420 | function returning a structure or union, needs to make space for | |
421 | not just the breakpoint but also an extra word containing the | |
422 | size (?) of the structure being passed. */ | |
423 | ||
424 | /* The actual breakpoint (at BP_ADDR) is inserted separatly so there | |
425 | is no need to write that out. */ | |
426 | ||
04714b91 AC |
427 | switch (CALL_DUMMY_LOCATION) |
428 | { | |
429 | case ON_STACK: | |
7043d8dc AC |
430 | /* "dummy_addr" is here just to keep old targets happy. New |
431 | targets return that same information via "sp" and "bp_addr". */ | |
432 | if (INNER_THAN (1, 2)) | |
d585e13a | 433 | { |
7043d8dc | 434 | sp = push_dummy_code (current_gdbarch, sp, funaddr, |
df407dfe | 435 | using_gcc, args, nargs, values_type, |
7043d8dc AC |
436 | &real_pc, &bp_addr); |
437 | dummy_addr = sp; | |
d585e13a | 438 | } |
7043d8dc AC |
439 | else |
440 | { | |
441 | dummy_addr = sp; | |
442 | sp = push_dummy_code (current_gdbarch, sp, funaddr, | |
df407dfe | 443 | using_gcc, args, nargs, values_type, |
7043d8dc AC |
444 | &real_pc, &bp_addr); |
445 | } | |
446 | break; | |
04714b91 AC |
447 | case AT_ENTRY_POINT: |
448 | real_pc = funaddr; | |
88a82a65 | 449 | dummy_addr = entry_point_address (); |
0285512f AC |
450 | /* Make certain that the address points at real code, and not a |
451 | function descriptor. */ | |
e2d0e7eb AC |
452 | dummy_addr = gdbarch_convert_from_func_ptr_addr (current_gdbarch, |
453 | dummy_addr, | |
454 | ¤t_target); | |
d585e13a AC |
455 | /* A call dummy always consists of just a single breakpoint, so |
456 | it's address is the same as the address of the dummy. */ | |
457 | bp_addr = dummy_addr; | |
04714b91 | 458 | break; |
9710e734 AC |
459 | case AT_SYMBOL: |
460 | /* Some executables define a symbol __CALL_DUMMY_ADDRESS whose | |
461 | address is the location where the breakpoint should be | |
462 | placed. Once all targets are using the overhauled frame code | |
463 | this can be deleted - ON_STACK is a better option. */ | |
464 | { | |
465 | struct minimal_symbol *sym; | |
466 | ||
467 | sym = lookup_minimal_symbol ("__CALL_DUMMY_ADDRESS", NULL, NULL); | |
468 | real_pc = funaddr; | |
469 | if (sym) | |
470 | dummy_addr = SYMBOL_VALUE_ADDRESS (sym); | |
471 | else | |
472 | dummy_addr = entry_point_address (); | |
0285512f AC |
473 | /* Make certain that the address points at real code, and not |
474 | a function descriptor. */ | |
e2d0e7eb AC |
475 | dummy_addr = gdbarch_convert_from_func_ptr_addr (current_gdbarch, |
476 | dummy_addr, | |
477 | ¤t_target); | |
0285512f AC |
478 | /* A call dummy always consists of just a single breakpoint, |
479 | so it's address is the same as the address of the dummy. */ | |
9710e734 AC |
480 | bp_addr = dummy_addr; |
481 | break; | |
482 | } | |
04714b91 AC |
483 | default: |
484 | internal_error (__FILE__, __LINE__, "bad switch"); | |
485 | } | |
486 | ||
04714b91 AC |
487 | if (nargs < TYPE_NFIELDS (ftype)) |
488 | error ("too few arguments in function call"); | |
489 | ||
ebc7896c AC |
490 | { |
491 | int i; | |
492 | for (i = nargs - 1; i >= 0; i--) | |
493 | { | |
494 | int prototyped; | |
495 | struct type *param_type; | |
496 | ||
497 | /* FIXME drow/2002-05-31: Should just always mark methods as | |
498 | prototyped. Can we respect TYPE_VARARGS? Probably not. */ | |
499 | if (TYPE_CODE (ftype) == TYPE_CODE_METHOD) | |
500 | prototyped = 1; | |
501 | else if (i < TYPE_NFIELDS (ftype)) | |
502 | prototyped = TYPE_PROTOTYPED (ftype); | |
503 | else | |
504 | prototyped = 0; | |
505 | ||
506 | if (i < TYPE_NFIELDS (ftype)) | |
507 | param_type = TYPE_FIELD_TYPE (ftype, i); | |
508 | else | |
509 | param_type = NULL; | |
510 | ||
511 | args[i] = value_arg_coerce (args[i], param_type, prototyped); | |
512 | ||
513 | /* elz: this code is to handle the case in which the function | |
514 | to be called has a pointer to function as parameter and the | |
515 | corresponding actual argument is the address of a function | |
516 | and not a pointer to function variable. In aCC compiled | |
517 | code, the calls through pointers to functions (in the body | |
518 | of the function called by hand) are made via | |
519 | $$dyncall_external which requires some registers setting, | |
520 | this is taken care of if we call via a function pointer | |
521 | variable, but not via a function address. In cc this is | |
522 | not a problem. */ | |
523 | ||
524 | if (using_gcc == 0) | |
525 | { | |
526 | if (param_type != NULL && TYPE_CODE (ftype) != TYPE_CODE_METHOD) | |
527 | { | |
528 | /* if this parameter is a pointer to function. */ | |
529 | if (TYPE_CODE (param_type) == TYPE_CODE_PTR) | |
530 | if (TYPE_CODE (TYPE_TARGET_TYPE (param_type)) == TYPE_CODE_FUNC) | |
531 | /* elz: FIXME here should go the test about the | |
532 | compiler used to compile the target. We want to | |
533 | issue the error message only if the compiler | |
534 | used was HP's aCC. If we used HP's cc, then | |
535 | there is no problem and no need to return at | |
536 | this point. */ | |
537 | /* Go see if the actual parameter is a variable of | |
538 | type pointer to function or just a function. */ | |
539 | if (args[i]->lval == not_lval) | |
540 | { | |
541 | char *arg_name; | |
542 | if (find_pc_partial_function ((CORE_ADDR) args[i]->aligner.contents[0], &arg_name, NULL, NULL)) | |
543 | error ("\ | |
04714b91 AC |
544 | You cannot use function <%s> as argument. \n\ |
545 | You must use a pointer to function type variable. Command ignored.", arg_name); | |
ebc7896c AC |
546 | } |
547 | } | |
548 | } | |
549 | } | |
550 | } | |
04714b91 | 551 | |
8e823e25 | 552 | if (DEPRECATED_REG_STRUCT_HAS_ADDR_P ()) |
04714b91 | 553 | { |
ebc7896c | 554 | int i; |
04714b91 AC |
555 | /* This is a machine like the sparc, where we may need to pass a |
556 | pointer to the structure, not the structure itself. */ | |
557 | for (i = nargs - 1; i >= 0; i--) | |
558 | { | |
df407dfe | 559 | struct type *arg_type = check_typedef (value_type (args[i])); |
04714b91 AC |
560 | if ((TYPE_CODE (arg_type) == TYPE_CODE_STRUCT |
561 | || TYPE_CODE (arg_type) == TYPE_CODE_UNION | |
562 | || TYPE_CODE (arg_type) == TYPE_CODE_ARRAY | |
563 | || TYPE_CODE (arg_type) == TYPE_CODE_STRING | |
564 | || TYPE_CODE (arg_type) == TYPE_CODE_BITSTRING | |
565 | || TYPE_CODE (arg_type) == TYPE_CODE_SET | |
566 | || (TYPE_CODE (arg_type) == TYPE_CODE_FLT | |
567 | && TYPE_LENGTH (arg_type) > 8) | |
568 | ) | |
8e823e25 | 569 | && DEPRECATED_REG_STRUCT_HAS_ADDR (using_gcc, arg_type)) |
04714b91 AC |
570 | { |
571 | CORE_ADDR addr; | |
572 | int len; /* = TYPE_LENGTH (arg_type); */ | |
573 | int aligned_len; | |
574 | arg_type = check_typedef (VALUE_ENCLOSING_TYPE (args[i])); | |
575 | len = TYPE_LENGTH (arg_type); | |
576 | ||
8241eaa6 | 577 | aligned_len = len; |
04714b91 AC |
578 | if (INNER_THAN (1, 2)) |
579 | { | |
580 | /* stack grows downward */ | |
581 | sp -= aligned_len; | |
582 | /* ... so the address of the thing we push is the | |
583 | stack pointer after we push it. */ | |
584 | addr = sp; | |
585 | } | |
586 | else | |
587 | { | |
588 | /* The stack grows up, so the address of the thing | |
589 | we push is the stack pointer before we push it. */ | |
590 | addr = sp; | |
591 | sp += aligned_len; | |
592 | } | |
593 | /* Push the structure. */ | |
594 | write_memory (addr, VALUE_CONTENTS_ALL (args[i]), len); | |
595 | /* The value we're going to pass is the address of the | |
596 | thing we just pushed. */ | |
df407dfe | 597 | /*args[i] = value_from_longest (lookup_pointer_type (values_type), |
04714b91 AC |
598 | (LONGEST) addr); */ |
599 | args[i] = value_from_pointer (lookup_pointer_type (arg_type), | |
600 | addr); | |
601 | } | |
602 | } | |
603 | } | |
604 | ||
605 | ||
606 | /* Reserve space for the return structure to be written on the | |
607 | stack, if necessary. Make certain that the value is correctly | |
608 | aligned. */ | |
609 | ||
610 | if (struct_return) | |
611 | { | |
df407dfe | 612 | int len = TYPE_LENGTH (values_type); |
04714b91 AC |
613 | if (INNER_THAN (1, 2)) |
614 | { | |
615 | /* Stack grows downward. Align STRUCT_ADDR and SP after | |
616 | making space for the return value. */ | |
617 | sp -= len; | |
618 | if (gdbarch_frame_align_p (current_gdbarch)) | |
619 | sp = gdbarch_frame_align (current_gdbarch, sp); | |
620 | struct_addr = sp; | |
621 | } | |
622 | else | |
623 | { | |
624 | /* Stack grows upward. Align the frame, allocate space, and | |
625 | then again, re-align the frame??? */ | |
626 | if (gdbarch_frame_align_p (current_gdbarch)) | |
627 | sp = gdbarch_frame_align (current_gdbarch, sp); | |
628 | struct_addr = sp; | |
629 | sp += len; | |
630 | if (gdbarch_frame_align_p (current_gdbarch)) | |
631 | sp = gdbarch_frame_align (current_gdbarch, sp); | |
632 | } | |
633 | } | |
634 | ||
04714b91 AC |
635 | /* Create the dummy stack frame. Pass in the call dummy address as, |
636 | presumably, the ABI code knows where, in the call dummy, the | |
637 | return address should be pointed. */ | |
638 | if (gdbarch_push_dummy_call_p (current_gdbarch)) | |
639 | /* When there is no push_dummy_call method, should this code | |
640 | simply error out. That would the implementation of this method | |
641 | for all ABIs (which is probably a good thing). */ | |
7d9b040b | 642 | sp = gdbarch_push_dummy_call (current_gdbarch, function, current_regcache, |
7043d8dc | 643 | bp_addr, nargs, args, sp, struct_return, |
04714b91 AC |
644 | struct_addr); |
645 | else if (DEPRECATED_PUSH_ARGUMENTS_P ()) | |
646 | /* Keep old targets working. */ | |
647 | sp = DEPRECATED_PUSH_ARGUMENTS (nargs, args, sp, struct_return, | |
648 | struct_addr); | |
649 | else | |
9a1dd1ad | 650 | error ("This target does not support function calls"); |
04714b91 | 651 | |
96860204 AC |
652 | /* Set up a frame ID for the dummy frame so we can pass it to |
653 | set_momentary_breakpoint. We need to give the breakpoint a frame | |
654 | ID so that the breakpoint code can correctly re-identify the | |
655 | dummy breakpoint. */ | |
8241eaa6 AC |
656 | /* Sanity. The exact same SP value is returned by PUSH_DUMMY_CALL, |
657 | saved as the dummy-frame TOS, and used by unwind_dummy_id to form | |
658 | the frame ID's stack address. */ | |
96860204 | 659 | dummy_id = frame_id_build (sp, bp_addr); |
04714b91 | 660 | |
74cfe982 AC |
661 | /* Create a momentary breakpoint at the return address of the |
662 | inferior. That way it breaks when it returns. */ | |
04714b91 | 663 | |
74cfe982 AC |
664 | { |
665 | struct breakpoint *bpt; | |
666 | struct symtab_and_line sal; | |
74cfe982 AC |
667 | init_sal (&sal); /* initialize to zeroes */ |
668 | sal.pc = bp_addr; | |
669 | sal.section = find_pc_overlay (sal.pc); | |
8241eaa6 AC |
670 | /* Sanity. The exact same SP value is returned by |
671 | PUSH_DUMMY_CALL, saved as the dummy-frame TOS, and used by | |
672 | unwind_dummy_id to form the frame ID's stack address. */ | |
96860204 | 673 | bpt = set_momentary_breakpoint (sal, dummy_id, bp_call_dummy); |
74cfe982 AC |
674 | bpt->disposition = disp_del; |
675 | } | |
04714b91 | 676 | |
96860204 AC |
677 | /* Everything's ready, push all the info needed to restore the |
678 | caller (and identify the dummy-frame) onto the dummy-frame | |
679 | stack. */ | |
680 | dummy_frame_push (caller_regcache, &dummy_id); | |
681 | discard_cleanups (caller_regcache_cleanup); | |
682 | ||
683 | /* - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - SNIP - | |
684 | If you're looking to implement asynchronous dummy-frames, then | |
685 | just below is the place to chop this function in two.. */ | |
686 | ||
687 | /* Now proceed, having reached the desired place. */ | |
688 | clear_proceed_status (); | |
689 | ||
74cfe982 AC |
690 | /* Execute a "stack dummy", a piece of code stored in the stack by |
691 | the debugger to be executed in the inferior. | |
04714b91 | 692 | |
74cfe982 AC |
693 | The dummy's frame is automatically popped whenever that break is |
694 | hit. If that is the first time the program stops, | |
695 | call_function_by_hand returns to its caller with that frame | |
696 | already gone and sets RC to 0. | |
697 | ||
698 | Otherwise, set RC to a non-zero value. If the called function | |
699 | receives a random signal, we do not allow the user to continue | |
700 | executing it as this may not work. The dummy frame is poped and | |
701 | we return 1. If we hit a breakpoint, we leave the frame in place | |
702 | and return 2 (the frame will eventually be popped when we do hit | |
703 | the dummy end breakpoint). */ | |
04714b91 | 704 | |
74cfe982 AC |
705 | { |
706 | struct cleanup *old_cleanups = make_cleanup (null_cleanup, 0); | |
707 | int saved_async = 0; | |
708 | ||
709 | /* If all error()s out of proceed ended up calling normal_stop | |
710 | (and perhaps they should; it already does in the special case | |
711 | of error out of resume()), then we wouldn't need this. */ | |
712 | make_cleanup (breakpoint_auto_delete_contents, &stop_bpstat); | |
713 | ||
714 | disable_watchpoints_before_interactive_call_start (); | |
715 | proceed_to_finish = 1; /* We want stop_registers, please... */ | |
716 | ||
717 | if (target_can_async_p ()) | |
718 | saved_async = target_async_mask (0); | |
719 | ||
720 | proceed (real_pc, TARGET_SIGNAL_0, 0); | |
721 | ||
722 | if (saved_async) | |
723 | target_async_mask (saved_async); | |
724 | ||
725 | enable_watchpoints_after_interactive_call_stop (); | |
04714b91 | 726 | |
74cfe982 | 727 | discard_cleanups (old_cleanups); |
52557533 | 728 | } |
04714b91 | 729 | |
52557533 AC |
730 | if (stopped_by_random_signal || !stop_stack_dummy) |
731 | { | |
732 | /* Find the name of the function we're about to complain about. */ | |
edcf254d | 733 | const char *name = NULL; |
04714b91 | 734 | { |
52557533 AC |
735 | struct symbol *symbol = find_pc_function (funaddr); |
736 | if (symbol) | |
737 | name = SYMBOL_PRINT_NAME (symbol); | |
738 | else | |
04714b91 | 739 | { |
52557533 AC |
740 | /* Try the minimal symbols. */ |
741 | struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (funaddr); | |
742 | if (msymbol) | |
743 | name = SYMBOL_PRINT_NAME (msymbol); | |
744 | } | |
edcf254d AC |
745 | if (name == NULL) |
746 | { | |
747 | /* Can't use a cleanup here. It is discarded, instead use | |
748 | an alloca. */ | |
bb599908 | 749 | char *tmp = xstrprintf ("at %s", hex_string (funaddr)); |
edcf254d AC |
750 | char *a = alloca (strlen (tmp) + 1); |
751 | strcpy (a, tmp); | |
752 | xfree (tmp); | |
753 | name = a; | |
754 | } | |
52557533 | 755 | } |
52557533 AC |
756 | if (stopped_by_random_signal) |
757 | { | |
758 | /* We stopped inside the FUNCTION because of a random | |
759 | signal. Further execution of the FUNCTION is not | |
760 | allowed. */ | |
04714b91 | 761 | |
52557533 AC |
762 | if (unwind_on_signal_p) |
763 | { | |
764 | /* The user wants the context restored. */ | |
765 | ||
766 | /* We must get back to the frame we were before the | |
767 | dummy call. */ | |
768 | frame_pop (get_current_frame ()); | |
04714b91 | 769 | |
52557533 AC |
770 | /* FIXME: Insert a bunch of wrap_here; name can be very |
771 | long if it's a C++ name with arguments and stuff. */ | |
772 | error ("\ | |
04714b91 AC |
773 | The program being debugged was signaled while in a function called from GDB.\n\ |
774 | GDB has restored the context to what it was before the call.\n\ | |
775 | To change this behavior use \"set unwindonsignal off\"\n\ | |
776 | Evaluation of the expression containing the function (%s) will be abandoned.", | |
52557533 AC |
777 | name); |
778 | } | |
779 | else | |
780 | { | |
781 | /* The user wants to stay in the frame where we stopped | |
782 | (default).*/ | |
783 | /* If we restored the inferior status (via the cleanup), | |
784 | we would print a spurious error message (Unable to | |
785 | restore previously selected frame), would write the | |
786 | registers from the inf_status (which is wrong), and | |
787 | would do other wrong things. */ | |
788 | discard_cleanups (inf_status_cleanup); | |
789 | discard_inferior_status (inf_status); | |
790 | /* FIXME: Insert a bunch of wrap_here; name can be very | |
791 | long if it's a C++ name with arguments and stuff. */ | |
792 | error ("\ | |
04714b91 AC |
793 | The program being debugged was signaled while in a function called from GDB.\n\ |
794 | GDB remains in the frame where the signal was received.\n\ | |
795 | To change this behavior use \"set unwindonsignal on\"\n\ | |
796 | Evaluation of the expression containing the function (%s) will be abandoned.", | |
52557533 AC |
797 | name); |
798 | } | |
799 | } | |
04714b91 | 800 | |
52557533 AC |
801 | if (!stop_stack_dummy) |
802 | { | |
803 | /* We hit a breakpoint inside the FUNCTION. */ | |
804 | /* If we restored the inferior status (via the cleanup), we | |
805 | would print a spurious error message (Unable to restore | |
806 | previously selected frame), would write the registers | |
807 | from the inf_status (which is wrong), and would do other | |
808 | wrong things. */ | |
809 | discard_cleanups (inf_status_cleanup); | |
810 | discard_inferior_status (inf_status); | |
811 | /* The following error message used to say "The expression | |
812 | which contained the function call has been discarded." | |
813 | It is a hard concept to explain in a few words. Ideally, | |
814 | GDB would be able to resume evaluation of the expression | |
815 | when the function finally is done executing. Perhaps | |
816 | someday this will be implemented (it would not be easy). */ | |
817 | /* FIXME: Insert a bunch of wrap_here; name can be very long if it's | |
818 | a C++ name with arguments and stuff. */ | |
819 | error ("\ | |
04714b91 AC |
820 | The program being debugged stopped while in a function called from GDB.\n\ |
821 | When the function (%s) is done executing, GDB will silently\n\ | |
822 | stop (instead of continuing to evaluate the expression containing\n\ | |
823 | the function call).", name); | |
52557533 AC |
824 | } |
825 | ||
826 | /* The above code errors out, so ... */ | |
827 | internal_error (__FILE__, __LINE__, "... should not be here"); | |
828 | } | |
04714b91 | 829 | |
74cfe982 AC |
830 | /* If we get here the called FUNCTION run to completion. */ |
831 | ||
832 | /* On normal return, the stack dummy has been popped already. */ | |
833 | regcache_cpy_no_passthrough (retbuf, stop_registers); | |
834 | ||
835 | /* Restore the inferior status, via its cleanup. At this stage, | |
836 | leave the RETBUF alone. */ | |
837 | do_cleanups (inf_status_cleanup); | |
838 | ||
44e5158b AC |
839 | /* Figure out the value returned by the function, return that. */ |
840 | { | |
841 | struct value *retval; | |
df407dfe | 842 | if (TYPE_CODE (values_type) == TYPE_CODE_VOID) |
44e5158b AC |
843 | /* If the function returns void, don't bother fetching the |
844 | return value. */ | |
df407dfe | 845 | retval = allocate_value (values_type); |
44e5158b | 846 | else if (struct_return) |
64f395bf AC |
847 | /* NOTE: cagney/2003-09-27: This assumes that PUSH_DUMMY_CALL |
848 | has correctly stored STRUCT_ADDR in the target. In the past | |
849 | that hasn't been the case, the old MIPS PUSH_ARGUMENTS | |
850 | (PUSH_DUMMY_CALL precursor) would silently move the location | |
851 | of the struct return value making STRUCT_ADDR bogus. If | |
852 | you're seeing problems with values being returned using the | |
853 | "struct return convention", check that PUSH_DUMMY_CALL isn't | |
854 | playing tricks. */ | |
df407dfe | 855 | retval = value_at (values_type, struct_addr); |
750eb019 | 856 | else |
44e5158b AC |
857 | { |
858 | /* This code only handles "register convention". */ | |
df407dfe AC |
859 | retval = allocate_value (values_type); |
860 | gdb_assert (gdbarch_return_value (current_gdbarch, values_type, | |
44e5158b AC |
861 | NULL, NULL, NULL) |
862 | == RETURN_VALUE_REGISTER_CONVENTION); | |
df407dfe | 863 | gdbarch_return_value (current_gdbarch, values_type, retbuf, |
44e5158b AC |
864 | VALUE_CONTENTS_RAW (retval) /*read*/, |
865 | NULL /*write*/); | |
866 | } | |
44e5158b AC |
867 | do_cleanups (retbuf_cleanup); |
868 | return retval; | |
869 | } | |
04714b91 AC |
870 | } |
871 | ||
872 | void _initialize_infcall (void); | |
873 | ||
874 | void | |
875 | _initialize_infcall (void) | |
876 | { | |
877 | add_setshow_boolean_cmd ("coerce-float-to-double", class_obscure, | |
878 | &coerce_float_to_double_p, "\ | |
3b64bf98 AC |
879 | Set coercion of floats to doubles when calling functions.", "\ |
880 | Show coercion of floats to doubles when calling functions", "\ | |
04714b91 AC |
881 | Variables of type float should generally be converted to doubles before\n\ |
882 | calling an unprototyped function, and left alone when calling a prototyped\n\ | |
883 | function. However, some older debug info formats do not provide enough\n\ | |
884 | information to determine that a function is prototyped. If this flag is\n\ | |
885 | set, GDB will perform the conversion for a function it considers\n\ | |
886 | unprototyped.\n\ | |
887 | The default is to perform the conversion.\n", "\ | |
3b64bf98 | 888 | Coercion of floats to doubles when calling functions is %s.", |
04714b91 AC |
889 | NULL, NULL, &setlist, &showlist); |
890 | ||
891 | add_setshow_boolean_cmd ("unwindonsignal", no_class, | |
892 | &unwind_on_signal_p, "\ | |
3b64bf98 AC |
893 | Set unwinding of stack if a signal is received while in a call dummy.", "\ |
894 | Show unwinding of stack if a signal is received while in a call dummy.", "\ | |
04714b91 AC |
895 | The unwindonsignal lets the user determine what gdb should do if a signal\n\ |
896 | is received while in a function called from gdb (call dummy). If set, gdb\n\ | |
897 | unwinds the stack and restore the context to what as it was before the call.\n\ | |
898 | The default is to stop in the frame where the signal was received.", "\ | |
3b64bf98 | 899 | Unwinding of stack if a signal is received while in a call dummy is %s.", |
04714b91 AC |
900 | NULL, NULL, &setlist, &showlist); |
901 | } |