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1 | /* Target-dependent code for GDB, the GNU debugger. |
2 | Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000 | |
3 | Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
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. */ | |
21 | ||
22 | #include "defs.h" | |
23 | #include "frame.h" | |
24 | #include "inferior.h" | |
25 | #include "symtab.h" | |
26 | #include "target.h" | |
27 | #include "gdbcore.h" | |
28 | #include "gdbcmd.h" | |
29 | #include "symfile.h" | |
30 | #include "objfiles.h" | |
31 | ||
32 | /* The following two instructions are used in the signal trampoline | |
33 | code on linux/ppc */ | |
34 | #define INSTR_LI_R0_0x7777 0x38007777 | |
35 | #define INSTR_SC 0x44000002 | |
36 | ||
37 | /* Since the *-tdep.c files are platform independent (i.e, they may be | |
38 | used to build cross platform debuggers), we can't include system | |
39 | headers. Therefore, details concerning the sigcontext structure | |
40 | must be painstakingly rerecorded. What's worse, if these details | |
41 | ever change in the header files, they'll have to be changed here | |
42 | as well. */ | |
43 | ||
44 | /* __SIGNAL_FRAMESIZE from <asm/ptrace.h> */ | |
45 | #define PPC_LINUX_SIGNAL_FRAMESIZE 64 | |
46 | ||
47 | /* From <asm/sigcontext.h>, offsetof(struct sigcontext_struct, regs) == 0x1c */ | |
48 | #define PPC_LINUX_REGS_PTR_OFFSET (PPC_LINUX_SIGNAL_FRAMESIZE + 0x1c) | |
49 | ||
50 | /* From <asm/sigcontext.h>, | |
51 | offsetof(struct sigcontext_struct, handler) == 0x14 */ | |
52 | #define PPC_LINUX_HANDLER_PTR_OFFSET (PPC_LINUX_SIGNAL_FRAMESIZE + 0x14) | |
53 | ||
54 | /* From <asm/ptrace.h>, values for PT_NIP, PT_R1, and PT_LNK */ | |
55 | #define PPC_LINUX_PT_R0 0 | |
56 | #define PPC_LINUX_PT_R1 1 | |
57 | #define PPC_LINUX_PT_R2 2 | |
58 | #define PPC_LINUX_PT_R3 3 | |
59 | #define PPC_LINUX_PT_R4 4 | |
60 | #define PPC_LINUX_PT_R5 5 | |
61 | #define PPC_LINUX_PT_R6 6 | |
62 | #define PPC_LINUX_PT_R7 7 | |
63 | #define PPC_LINUX_PT_R8 8 | |
64 | #define PPC_LINUX_PT_R9 9 | |
65 | #define PPC_LINUX_PT_R10 10 | |
66 | #define PPC_LINUX_PT_R11 11 | |
67 | #define PPC_LINUX_PT_R12 12 | |
68 | #define PPC_LINUX_PT_R13 13 | |
69 | #define PPC_LINUX_PT_R14 14 | |
70 | #define PPC_LINUX_PT_R15 15 | |
71 | #define PPC_LINUX_PT_R16 16 | |
72 | #define PPC_LINUX_PT_R17 17 | |
73 | #define PPC_LINUX_PT_R18 18 | |
74 | #define PPC_LINUX_PT_R19 19 | |
75 | #define PPC_LINUX_PT_R20 20 | |
76 | #define PPC_LINUX_PT_R21 21 | |
77 | #define PPC_LINUX_PT_R22 22 | |
78 | #define PPC_LINUX_PT_R23 23 | |
79 | #define PPC_LINUX_PT_R24 24 | |
80 | #define PPC_LINUX_PT_R25 25 | |
81 | #define PPC_LINUX_PT_R26 26 | |
82 | #define PPC_LINUX_PT_R27 27 | |
83 | #define PPC_LINUX_PT_R28 28 | |
84 | #define PPC_LINUX_PT_R29 29 | |
85 | #define PPC_LINUX_PT_R30 30 | |
86 | #define PPC_LINUX_PT_R31 31 | |
87 | #define PPC_LINUX_PT_NIP 32 | |
88 | #define PPC_LINUX_PT_MSR 33 | |
89 | #define PPC_LINUX_PT_CTR 35 | |
90 | #define PPC_LINUX_PT_LNK 36 | |
91 | #define PPC_LINUX_PT_XER 37 | |
92 | #define PPC_LINUX_PT_CCR 38 | |
93 | #define PPC_LINUX_PT_MQ 39 | |
94 | #define PPC_LINUX_PT_FPR0 48 /* each FP reg occupies 2 slots in this space */ | |
95 | #define PPC_LINUX_PT_FPR31 (PPC_LINUX_PT_FPR0 + 2*31) | |
96 | #define PPC_LINUX_PT_FPSCR (PPC_LINUX_PT_FPR0 + 2*32 + 1) | |
97 | ||
50c9bd31 KB |
98 | int ppc_linux_at_sigtramp_return_path (CORE_ADDR pc); |
99 | ||
c877c8e6 KB |
100 | /* Determine if pc is in a signal trampoline... |
101 | ||
102 | Ha! That's not what this does at all. wait_for_inferior in infrun.c | |
103 | calls IN_SIGTRAMP in order to detect entry into a signal trampoline | |
104 | just after delivery of a signal. But on linux, signal trampolines | |
105 | are used for the return path only. The kernel sets things up so that | |
106 | the signal handler is called directly. | |
107 | ||
108 | If we use in_sigtramp2() in place of in_sigtramp() (see below) | |
109 | we'll (often) end up with stop_pc in the trampoline and prev_pc in | |
110 | the (now exited) handler. The code there will cause a temporary | |
111 | breakpoint to be set on prev_pc which is not very likely to get hit | |
112 | again. | |
113 | ||
114 | If this is confusing, think of it this way... the code in | |
115 | wait_for_inferior() needs to be able to detect entry into a signal | |
116 | trampoline just after a signal is delivered, not after the handler | |
117 | has been run. | |
118 | ||
119 | So, we define in_sigtramp() below to return 1 if the following is | |
120 | true: | |
121 | ||
122 | 1) The previous frame is a real signal trampoline. | |
123 | ||
124 | - and - | |
125 | ||
126 | 2) pc is at the first or second instruction of the corresponding | |
127 | handler. | |
128 | ||
129 | Why the second instruction? It seems that wait_for_inferior() | |
130 | never sees the first instruction when single stepping. When a | |
131 | signal is delivered while stepping, the next instruction that | |
132 | would've been stepped over isn't, instead a signal is delivered and | |
133 | the first instruction of the handler is stepped over instead. That | |
134 | puts us on the second instruction. (I added the test for the | |
135 | first instruction long after the fact, just in case the observed | |
136 | behavior is ever fixed.) | |
137 | ||
138 | IN_SIGTRAMP is called from blockframe.c as well in order to set | |
139 | the signal_handler_caller flag. Because of our strange definition | |
140 | of in_sigtramp below, we can't rely on signal_handler_caller getting | |
141 | set correctly from within blockframe.c. This is why we take pains | |
142 | to set it in init_extra_frame_info(). */ | |
143 | ||
144 | int | |
145 | ppc_linux_in_sigtramp (CORE_ADDR pc, char *func_name) | |
146 | { | |
147 | CORE_ADDR lr; | |
148 | CORE_ADDR sp; | |
149 | CORE_ADDR tramp_sp; | |
150 | char buf[4]; | |
151 | CORE_ADDR handler; | |
152 | ||
153 | lr = read_register (LR_REGNUM); | |
154 | if (!ppc_linux_at_sigtramp_return_path (lr)) | |
155 | return 0; | |
156 | ||
157 | sp = read_register (SP_REGNUM); | |
158 | ||
159 | if (target_read_memory (sp, buf, sizeof (buf)) != 0) | |
160 | return 0; | |
161 | ||
162 | tramp_sp = extract_unsigned_integer (buf, 4); | |
163 | ||
164 | if (target_read_memory (tramp_sp + PPC_LINUX_HANDLER_PTR_OFFSET, buf, | |
165 | sizeof (buf)) != 0) | |
166 | return 0; | |
167 | ||
168 | handler = extract_unsigned_integer (buf, 4); | |
169 | ||
170 | return (pc == handler || pc == handler + 4); | |
171 | } | |
172 | ||
173 | /* | |
174 | * The signal handler trampoline is on the stack and consists of exactly | |
175 | * two instructions. The easiest and most accurate way of determining | |
176 | * whether the pc is in one of these trampolines is by inspecting the | |
177 | * instructions. It'd be faster though if we could find a way to do this | |
178 | * via some simple address comparisons. | |
179 | */ | |
180 | int | |
181 | ppc_linux_at_sigtramp_return_path (CORE_ADDR pc) | |
182 | { | |
183 | char buf[12]; | |
184 | unsigned long pcinsn; | |
185 | if (target_read_memory (pc - 4, buf, sizeof (buf)) != 0) | |
186 | return 0; | |
187 | ||
188 | /* extract the instruction at the pc */ | |
189 | pcinsn = extract_unsigned_integer (buf + 4, 4); | |
190 | ||
191 | return ( | |
192 | (pcinsn == INSTR_LI_R0_0x7777 | |
193 | && extract_unsigned_integer (buf + 8, 4) == INSTR_SC) | |
194 | || | |
195 | (pcinsn == INSTR_SC | |
196 | && extract_unsigned_integer (buf, 4) == INSTR_LI_R0_0x7777)); | |
197 | } | |
198 | ||
199 | CORE_ADDR | |
200 | ppc_linux_skip_trampoline_code (CORE_ADDR pc) | |
201 | { | |
202 | char buf[4]; | |
203 | struct obj_section *sect; | |
204 | struct objfile *objfile; | |
205 | unsigned long insn; | |
206 | CORE_ADDR plt_start = 0; | |
207 | CORE_ADDR symtab = 0; | |
208 | CORE_ADDR strtab = 0; | |
209 | int num_slots = -1; | |
210 | int reloc_index = -1; | |
211 | CORE_ADDR plt_table; | |
212 | CORE_ADDR reloc; | |
213 | CORE_ADDR sym; | |
214 | long symidx; | |
215 | char symname[1024]; | |
216 | struct minimal_symbol *msymbol; | |
217 | ||
218 | /* Find the section pc is in; return if not in .plt */ | |
219 | sect = find_pc_section (pc); | |
220 | if (!sect || strcmp (sect->the_bfd_section->name, ".plt") != 0) | |
221 | return 0; | |
222 | ||
223 | objfile = sect->objfile; | |
224 | ||
225 | /* Pick up the instruction at pc. It had better be of the | |
226 | form | |
227 | li r11, IDX | |
228 | ||
229 | where IDX is an index into the plt_table. */ | |
230 | ||
231 | if (target_read_memory (pc, buf, 4) != 0) | |
232 | return 0; | |
233 | insn = extract_unsigned_integer (buf, 4); | |
234 | ||
235 | if ((insn & 0xffff0000) != 0x39600000 /* li r11, VAL */ ) | |
236 | return 0; | |
237 | ||
238 | reloc_index = (insn << 16) >> 16; | |
239 | ||
240 | /* Find the objfile that pc is in and obtain the information | |
241 | necessary for finding the symbol name. */ | |
242 | for (sect = objfile->sections; sect < objfile->sections_end; ++sect) | |
243 | { | |
244 | const char *secname = sect->the_bfd_section->name; | |
245 | if (strcmp (secname, ".plt") == 0) | |
246 | plt_start = sect->addr; | |
247 | else if (strcmp (secname, ".rela.plt") == 0) | |
248 | num_slots = ((int) sect->endaddr - (int) sect->addr) / 12; | |
249 | else if (strcmp (secname, ".dynsym") == 0) | |
250 | symtab = sect->addr; | |
251 | else if (strcmp (secname, ".dynstr") == 0) | |
252 | strtab = sect->addr; | |
253 | } | |
254 | ||
255 | /* Make sure we have all the information we need. */ | |
256 | if (plt_start == 0 || num_slots == -1 || symtab == 0 || strtab == 0) | |
257 | return 0; | |
258 | ||
259 | /* Compute the value of the plt table */ | |
260 | plt_table = plt_start + 72 + 8 * num_slots; | |
261 | ||
262 | /* Get address of the relocation entry (Elf32_Rela) */ | |
263 | if (target_read_memory (plt_table + reloc_index, buf, 4) != 0) | |
264 | return 0; | |
265 | reloc = extract_address (buf, 4); | |
266 | ||
267 | sect = find_pc_section (reloc); | |
268 | if (!sect) | |
269 | return 0; | |
270 | ||
271 | if (strcmp (sect->the_bfd_section->name, ".text") == 0) | |
272 | return reloc; | |
273 | ||
274 | /* Now get the r_info field which is the relocation type and symbol | |
275 | index. */ | |
276 | if (target_read_memory (reloc + 4, buf, 4) != 0) | |
277 | return 0; | |
278 | symidx = extract_unsigned_integer (buf, 4); | |
279 | ||
280 | /* Shift out the relocation type leaving just the symbol index */ | |
281 | /* symidx = ELF32_R_SYM(symidx); */ | |
282 | symidx = symidx >> 8; | |
283 | ||
284 | /* compute the address of the symbol */ | |
285 | sym = symtab + symidx * 4; | |
286 | ||
287 | /* Fetch the string table index */ | |
288 | if (target_read_memory (sym, buf, 4) != 0) | |
289 | return 0; | |
290 | symidx = extract_unsigned_integer (buf, 4); | |
291 | ||
292 | /* Fetch the string; we don't know how long it is. Is it possible | |
293 | that the following will fail because we're trying to fetch too | |
294 | much? */ | |
295 | if (target_read_memory (strtab + symidx, symname, sizeof (symname)) != 0) | |
296 | return 0; | |
297 | ||
298 | /* This might not work right if we have multiple symbols with the | |
299 | same name; the only way to really get it right is to perform | |
300 | the same sort of lookup as the dynamic linker. */ | |
301 | msymbol = lookup_minimal_symbol_text (symname, NULL, NULL); | |
302 | if (!msymbol) | |
303 | return 0; | |
304 | ||
305 | return SYMBOL_VALUE_ADDRESS (msymbol); | |
306 | } | |
307 | ||
308 | /* The rs6000 version of FRAME_SAVED_PC will almost work for us. The | |
309 | signal handler details are different, so we'll handle those here | |
310 | and call the rs6000 version to do the rest. */ | |
311 | unsigned long | |
312 | ppc_linux_frame_saved_pc (struct frame_info *fi) | |
313 | { | |
314 | if (fi->signal_handler_caller) | |
315 | { | |
316 | CORE_ADDR regs_addr = | |
50c9bd31 | 317 | read_memory_integer (fi->frame + PPC_LINUX_REGS_PTR_OFFSET, 4); |
c877c8e6 KB |
318 | /* return the NIP in the regs array */ |
319 | return read_memory_integer (regs_addr + 4 * PPC_LINUX_PT_NIP, 4); | |
320 | } | |
50c9bd31 KB |
321 | else if (fi->next && fi->next->signal_handler_caller) |
322 | { | |
323 | CORE_ADDR regs_addr = | |
324 | read_memory_integer (fi->next->frame + PPC_LINUX_REGS_PTR_OFFSET, 4); | |
325 | /* return LNK in the regs array */ | |
326 | return read_memory_integer (regs_addr + 4 * PPC_LINUX_PT_LNK, 4); | |
327 | } | |
328 | else | |
329 | return rs6000_frame_saved_pc (fi); | |
c877c8e6 KB |
330 | } |
331 | ||
332 | void | |
333 | ppc_linux_init_extra_frame_info (int fromleaf, struct frame_info *fi) | |
334 | { | |
335 | rs6000_init_extra_frame_info (fromleaf, fi); | |
336 | ||
337 | if (fi->next != 0) | |
338 | { | |
339 | /* We're called from get_prev_frame_info; check to see if | |
340 | this is a signal frame by looking to see if the pc points | |
341 | at trampoline code */ | |
342 | if (ppc_linux_at_sigtramp_return_path (fi->pc)) | |
343 | fi->signal_handler_caller = 1; | |
344 | else | |
345 | fi->signal_handler_caller = 0; | |
346 | } | |
347 | } | |
348 | ||
349 | int | |
350 | ppc_linux_frameless_function_invocation (struct frame_info *fi) | |
351 | { | |
352 | /* We'll find the wrong thing if we let | |
353 | rs6000_frameless_function_invocation () search for a signal trampoline */ | |
354 | if (ppc_linux_at_sigtramp_return_path (fi->pc)) | |
355 | return 0; | |
356 | else | |
357 | return rs6000_frameless_function_invocation (fi); | |
358 | } | |
359 | ||
360 | void | |
361 | ppc_linux_frame_init_saved_regs (struct frame_info *fi) | |
362 | { | |
363 | if (fi->signal_handler_caller) | |
364 | { | |
365 | CORE_ADDR regs_addr; | |
366 | int i; | |
367 | if (fi->saved_regs) | |
368 | return; | |
369 | ||
370 | frame_saved_regs_zalloc (fi); | |
371 | ||
372 | regs_addr = | |
373 | read_memory_integer (fi->frame + PPC_LINUX_REGS_PTR_OFFSET, 4); | |
374 | fi->saved_regs[PC_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_NIP; | |
375 | fi->saved_regs[PS_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_MSR; | |
376 | fi->saved_regs[CR_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_CCR; | |
377 | fi->saved_regs[LR_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_LNK; | |
378 | fi->saved_regs[CTR_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_CTR; | |
379 | fi->saved_regs[XER_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_XER; | |
380 | fi->saved_regs[MQ_REGNUM] = regs_addr + 4 * PPC_LINUX_PT_MQ; | |
381 | for (i = 0; i < 32; i++) | |
382 | fi->saved_regs[GP0_REGNUM + i] = regs_addr + 4 * PPC_LINUX_PT_R0 + 4 * i; | |
383 | for (i = 0; i < 32; i++) | |
384 | fi->saved_regs[FP0_REGNUM + i] = regs_addr + 4 * PPC_LINUX_PT_FPR0 + 8 * i; | |
385 | } | |
386 | else | |
387 | rs6000_frame_init_saved_regs (fi); | |
388 | } | |
389 | ||
390 | CORE_ADDR | |
391 | ppc_linux_frame_chain (struct frame_info *thisframe) | |
392 | { | |
393 | /* Kernel properly constructs the frame chain for the handler */ | |
394 | if (thisframe->signal_handler_caller) | |
395 | return read_memory_integer ((thisframe)->frame, 4); | |
396 | else | |
397 | return rs6000_frame_chain (thisframe); | |
398 | } | |
399 | ||
400 | /* FIXME: Move the following to rs6000-tdep.c (or some other file where | |
401 | it may be used generically by ports which use either the SysV ABI or | |
402 | the EABI */ | |
403 | ||
404 | /* round2 rounds x up to the nearest multiple of s assuming that s is a | |
405 | power of 2 */ | |
406 | ||
407 | #undef round2 | |
408 | #define round2(x,s) ((((long) (x) - 1) & ~(long)((s)-1)) + (s)) | |
409 | ||
410 | /* Pass the arguments in either registers, or in the stack. Using the | |
411 | ppc sysv ABI, the first eight words of the argument list (that might | |
412 | be less than eight parameters if some parameters occupy more than one | |
413 | word) are passed in r3..r10 registers. float and double parameters are | |
414 | passed in fpr's, in addition to that. Rest of the parameters if any | |
415 | are passed in user stack. | |
416 | ||
417 | If the function is returning a structure, then the return address is passed | |
418 | in r3, then the first 7 words of the parametes can be passed in registers, | |
419 | starting from r4. */ | |
420 | ||
421 | CORE_ADDR | |
422 | ppc_sysv_abi_push_arguments (nargs, args, sp, struct_return, struct_addr) | |
423 | int nargs; | |
424 | value_ptr *args; | |
425 | CORE_ADDR sp; | |
426 | int struct_return; | |
427 | CORE_ADDR struct_addr; | |
428 | { | |
429 | int argno; | |
430 | int greg, freg; | |
431 | int argstkspace; | |
432 | int structstkspace; | |
433 | int argoffset; | |
434 | int structoffset; | |
435 | value_ptr arg; | |
436 | struct type *type; | |
437 | int len; | |
438 | char old_sp_buf[4]; | |
439 | CORE_ADDR saved_sp; | |
440 | ||
441 | greg = struct_return ? 4 : 3; | |
442 | freg = 1; | |
443 | argstkspace = 0; | |
444 | structstkspace = 0; | |
445 | ||
446 | /* Figure out how much new stack space is required for arguments | |
447 | which don't fit in registers. Unlike the PowerOpen ABI, the | |
448 | SysV ABI doesn't reserve any extra space for parameters which | |
449 | are put in registers. */ | |
450 | for (argno = 0; argno < nargs; argno++) | |
451 | { | |
452 | arg = args[argno]; | |
453 | type = check_typedef (VALUE_TYPE (arg)); | |
454 | len = TYPE_LENGTH (type); | |
455 | ||
456 | if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
457 | { | |
458 | if (freg <= 8) | |
459 | freg++; | |
460 | else | |
461 | { | |
462 | /* SysV ABI converts floats to doubles when placed in | |
463 | memory and requires 8 byte alignment */ | |
464 | if (argstkspace & 0x4) | |
465 | argstkspace += 4; | |
466 | argstkspace += 8; | |
467 | } | |
468 | } | |
469 | else if (TYPE_CODE (type) == TYPE_CODE_INT && len == 8) /* long long */ | |
470 | { | |
471 | if (greg > 9) | |
472 | { | |
473 | greg = 11; | |
474 | if (argstkspace & 0x4) | |
475 | argstkspace += 4; | |
476 | argstkspace += 8; | |
477 | } | |
478 | else | |
479 | { | |
480 | if ((greg & 1) == 0) | |
481 | greg++; | |
482 | greg += 2; | |
483 | } | |
484 | } | |
485 | else | |
486 | { | |
487 | if (len > 4 | |
488 | || TYPE_CODE (type) == TYPE_CODE_STRUCT | |
489 | || TYPE_CODE (type) == TYPE_CODE_UNION) | |
490 | { | |
491 | /* Rounding to the nearest multiple of 8 may not be necessary, | |
492 | but it is safe. Particularly since we don't know the | |
493 | field types of the structure */ | |
494 | structstkspace += round2 (len, 8); | |
495 | } | |
496 | if (greg <= 10) | |
497 | greg++; | |
498 | else | |
499 | argstkspace += 4; | |
500 | } | |
501 | } | |
502 | ||
503 | /* Get current SP location */ | |
504 | saved_sp = read_sp (); | |
505 | ||
506 | sp -= argstkspace + structstkspace; | |
507 | ||
508 | /* Allocate space for backchain and callee's saved lr */ | |
509 | sp -= 8; | |
510 | ||
511 | /* Make sure that we maintain 16 byte alignment */ | |
512 | sp &= ~0x0f; | |
513 | ||
514 | /* Update %sp before proceeding any further */ | |
515 | write_register (SP_REGNUM, sp); | |
516 | ||
517 | /* write the backchain */ | |
518 | store_address (old_sp_buf, 4, saved_sp); | |
519 | write_memory (sp, old_sp_buf, 4); | |
520 | ||
521 | argoffset = 8; | |
522 | structoffset = argoffset + argstkspace; | |
523 | freg = 1; | |
524 | greg = 3; | |
482ca3f5 KB |
525 | /* Fill in r3 with the return structure, if any */ |
526 | if (struct_return) | |
527 | { | |
528 | char val_buf[4]; | |
529 | store_address (val_buf, 4, struct_addr); | |
530 | memcpy (®isters[REGISTER_BYTE (greg)], val_buf, 4); | |
531 | greg++; | |
532 | } | |
c877c8e6 KB |
533 | /* Now fill in the registers and stack... */ |
534 | for (argno = 0; argno < nargs; argno++) | |
535 | { | |
536 | arg = args[argno]; | |
537 | type = check_typedef (VALUE_TYPE (arg)); | |
538 | len = TYPE_LENGTH (type); | |
539 | ||
540 | if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
541 | { | |
542 | if (freg <= 8) | |
543 | { | |
544 | if (len > 8) | |
545 | printf_unfiltered ( | |
546 | "Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno); | |
547 | memcpy (®isters[REGISTER_BYTE (FP0_REGNUM + freg)], | |
548 | VALUE_CONTENTS (arg), len); | |
549 | freg++; | |
550 | } | |
551 | else | |
552 | { | |
553 | /* SysV ABI converts floats to doubles when placed in | |
554 | memory and requires 8 byte alignment */ | |
555 | /* FIXME: Convert floats to doubles */ | |
556 | if (argoffset & 0x4) | |
557 | argoffset += 4; | |
558 | write_memory (sp + argoffset, (char *) VALUE_CONTENTS (arg), len); | |
559 | argoffset += 8; | |
560 | } | |
561 | } | |
562 | else if (TYPE_CODE (type) == TYPE_CODE_INT && len == 8) /* long long */ | |
563 | { | |
564 | if (greg > 9) | |
565 | { | |
566 | greg = 11; | |
567 | if (argoffset & 0x4) | |
568 | argoffset += 4; | |
569 | write_memory (sp + argoffset, (char *) VALUE_CONTENTS (arg), len); | |
570 | argoffset += 8; | |
571 | } | |
572 | else | |
573 | { | |
574 | if ((greg & 1) == 0) | |
575 | greg++; | |
576 | ||
577 | memcpy (®isters[REGISTER_BYTE (greg)], | |
578 | VALUE_CONTENTS (arg), 4); | |
579 | memcpy (®isters[REGISTER_BYTE (greg + 1)], | |
580 | VALUE_CONTENTS (arg) + 4, 4); | |
581 | greg += 2; | |
582 | } | |
583 | } | |
584 | else | |
585 | { | |
586 | char val_buf[4]; | |
587 | if (len > 4 | |
588 | || TYPE_CODE (type) == TYPE_CODE_STRUCT | |
589 | || TYPE_CODE (type) == TYPE_CODE_UNION) | |
590 | { | |
591 | write_memory (sp + structoffset, VALUE_CONTENTS (arg), len); | |
592 | store_address (val_buf, 4, sp + structoffset); | |
593 | structoffset += round2 (len, 8); | |
594 | } | |
595 | else | |
596 | { | |
597 | memset (val_buf, 0, 4); | |
598 | memcpy (val_buf, VALUE_CONTENTS (arg), len); | |
599 | } | |
600 | if (greg <= 10) | |
601 | { | |
602 | *(int *) ®isters[REGISTER_BYTE (greg)] = 0; | |
603 | memcpy (®isters[REGISTER_BYTE (greg)], val_buf, 4); | |
604 | greg++; | |
605 | } | |
606 | else | |
607 | { | |
608 | write_memory (sp + argoffset, val_buf, 4); | |
609 | argoffset += 4; | |
610 | } | |
611 | } | |
612 | } | |
613 | ||
614 | target_store_registers (-1); | |
615 | return sp; | |
616 | } | |
482ca3f5 KB |
617 | |
618 | /* This version of ppc_linux_memory_remove_breakpoints handles the | |
619 | case of self modifying code */ | |
620 | int | |
621 | ppc_linux_memory_remove_breakpoint (CORE_ADDR addr, char *contents_cache) | |
622 | { | |
623 | unsigned char *bp; | |
624 | int val; | |
625 | int bplen; | |
626 | char old_contents[BREAKPOINT_MAX]; | |
627 | ||
628 | /* Determine appropriate breakpoint contents and size for this address. */ | |
629 | bp = BREAKPOINT_FROM_PC (&addr, &bplen); | |
630 | if (bp == NULL) | |
631 | error ("Software breakpoints not implemented for this target."); | |
632 | ||
633 | val = target_read_memory (addr, old_contents, bplen); | |
634 | ||
635 | /* If our breakpoint is no longer at the address, this means that the | |
636 | program modified the code on us, so it is wrong to put back the | |
637 | old value */ | |
638 | if (val == 0 && memcmp (bp, old_contents, bplen) == 0) | |
639 | val = target_write_memory (addr, contents_cache, bplen); | |
640 | ||
641 | return val; | |
642 | } |