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1f82754b JB |
1 | /* Native support code for PPC AIX, for GDB the GNU debugger. |
2 | ||
213516ef | 3 | Copyright (C) 2006-2023 Free Software Foundation, Inc. |
1f82754b JB |
4 | |
5 | Free Software Foundation, Inc. | |
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 | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
1f82754b JB |
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 | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
1f82754b JB |
21 | |
22 | #include "defs.h" | |
23 | #include "osabi.h" | |
7a61a01c UW |
24 | #include "regcache.h" |
25 | #include "regset.h" | |
4a7622d1 UW |
26 | #include "gdbtypes.h" |
27 | #include "gdbcore.h" | |
28 | #include "target.h" | |
29 | #include "value.h" | |
30 | #include "infcall.h" | |
31 | #include "objfiles.h" | |
32 | #include "breakpoint.h" | |
6f7f3f0d | 33 | #include "ppc-tdep.h" |
356a5233 | 34 | #include "rs6000-aix-tdep.h" |
d5367fe1 | 35 | #include "xcoffread.h" |
4d1eb6b4 JB |
36 | #include "solib.h" |
37 | #include "solib-aix.h" | |
3b2ca824 | 38 | #include "target-float.h" |
268a13a5 | 39 | #include "gdbsupport/xml-utils.h" |
cdcda965 SM |
40 | #include "trad-frame.h" |
41 | #include "frame-unwind.h" | |
4a7622d1 UW |
42 | |
43 | /* If the kernel has to deliver a signal, it pushes a sigcontext | |
44 | structure on the stack and then calls the signal handler, passing | |
0df8b418 | 45 | the address of the sigcontext in an argument register. Usually |
4a7622d1 UW |
46 | the signal handler doesn't save this register, so we have to |
47 | access the sigcontext structure via an offset from the signal handler | |
48 | frame. | |
cdcda965 SM |
49 | The following constants were determined by experimentation on AIX 3.2. |
50 | ||
51 | sigcontext structure have the mstsave saved under the | |
52 | sc_jmpbuf.jmp_context. STKMIN(minimum stack size) is 56 for 32-bit | |
53 | processes, and iar offset under sc_jmpbuf.jmp_context is 40. | |
54 | ie offsetof(struct sigcontext, sc_jmpbuf.jmp_context.iar). | |
55 | so PC offset in this case is STKMIN+iar offset, which is 96. */ | |
56 | ||
4a7622d1 UW |
57 | #define SIG_FRAME_PC_OFFSET 96 |
58 | #define SIG_FRAME_LR_OFFSET 108 | |
cdcda965 | 59 | /* STKMIN+grp1 offset, which is 56+228=284 */ |
4a7622d1 UW |
60 | #define SIG_FRAME_FP_OFFSET 284 |
61 | ||
cdcda965 SM |
62 | /* 64 bit process. |
63 | STKMIN64 is 112 and iar offset is 312. So 112+312=424 */ | |
64 | #define SIG_FRAME_LR_OFFSET64 424 | |
65 | /* STKMIN64+grp1 offset. 112+56=168 */ | |
66 | #define SIG_FRAME_FP_OFFSET64 168 | |
67 | ||
629f88f8 SM |
68 | /* Minimum possible text address in AIX. */ |
69 | #define AIX_TEXT_SEGMENT_BASE 0x10000000 | |
70 | ||
cdcda965 | 71 | static struct trad_frame_cache * |
bd2b40ac | 72 | aix_sighandle_frame_cache (frame_info_ptr this_frame, |
cdcda965 SM |
73 | void **this_cache) |
74 | { | |
75 | LONGEST backchain; | |
76 | CORE_ADDR base, base_orig, func; | |
77 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
08106042 | 78 | ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch); |
cdcda965 SM |
79 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
80 | struct trad_frame_cache *this_trad_cache; | |
81 | ||
82 | if ((*this_cache) != NULL) | |
83 | return (struct trad_frame_cache *) (*this_cache); | |
84 | ||
85 | this_trad_cache = trad_frame_cache_zalloc (this_frame); | |
86 | (*this_cache) = this_trad_cache; | |
87 | ||
88 | base = get_frame_register_unsigned (this_frame, | |
dda83cd7 | 89 | gdbarch_sp_regnum (gdbarch)); |
cdcda965 SM |
90 | base_orig = base; |
91 | ||
92 | if (tdep->wordsize == 4) | |
93 | { | |
94 | func = read_memory_unsigned_integer (base_orig + | |
95 | SIG_FRAME_PC_OFFSET + 8, | |
96 | tdep->wordsize, byte_order); | |
97 | safe_read_memory_integer (base_orig + SIG_FRAME_FP_OFFSET + 8, | |
98 | tdep->wordsize, byte_order, &backchain); | |
99 | base = (CORE_ADDR)backchain; | |
100 | } | |
101 | else | |
102 | { | |
103 | func = read_memory_unsigned_integer (base_orig + | |
104 | SIG_FRAME_LR_OFFSET64, | |
105 | tdep->wordsize, byte_order); | |
106 | safe_read_memory_integer (base_orig + SIG_FRAME_FP_OFFSET64, | |
107 | tdep->wordsize, byte_order, &backchain); | |
108 | base = (CORE_ADDR)backchain; | |
109 | } | |
110 | ||
111 | trad_frame_set_reg_value (this_trad_cache, gdbarch_pc_regnum (gdbarch), func); | |
112 | trad_frame_set_reg_value (this_trad_cache, gdbarch_sp_regnum (gdbarch), base); | |
113 | ||
114 | if (tdep->wordsize == 4) | |
115 | trad_frame_set_reg_addr (this_trad_cache, tdep->ppc_lr_regnum, | |
dda83cd7 | 116 | base_orig + 0x38 + 52 + 8); |
cdcda965 SM |
117 | else |
118 | trad_frame_set_reg_addr (this_trad_cache, tdep->ppc_lr_regnum, | |
dda83cd7 | 119 | base_orig + 0x70 + 320); |
cdcda965 SM |
120 | |
121 | trad_frame_set_id (this_trad_cache, frame_id_build (base, func)); | |
122 | trad_frame_set_this_base (this_trad_cache, base); | |
123 | ||
124 | return this_trad_cache; | |
125 | } | |
126 | ||
127 | static void | |
bd2b40ac | 128 | aix_sighandle_frame_this_id (frame_info_ptr this_frame, |
cdcda965 SM |
129 | void **this_prologue_cache, |
130 | struct frame_id *this_id) | |
131 | { | |
132 | struct trad_frame_cache *this_trad_cache | |
133 | = aix_sighandle_frame_cache (this_frame, this_prologue_cache); | |
134 | trad_frame_get_id (this_trad_cache, this_id); | |
135 | } | |
136 | ||
137 | static struct value * | |
bd2b40ac | 138 | aix_sighandle_frame_prev_register (frame_info_ptr this_frame, |
cdcda965 SM |
139 | void **this_prologue_cache, int regnum) |
140 | { | |
141 | struct trad_frame_cache *this_trad_cache | |
142 | = aix_sighandle_frame_cache (this_frame, this_prologue_cache); | |
143 | return trad_frame_get_register (this_trad_cache, this_frame, regnum); | |
144 | } | |
145 | ||
cb8c24b6 | 146 | static int |
cdcda965 | 147 | aix_sighandle_frame_sniffer (const struct frame_unwind *self, |
bd2b40ac | 148 | frame_info_ptr this_frame, |
cdcda965 SM |
149 | void **this_prologue_cache) |
150 | { | |
151 | CORE_ADDR pc = get_frame_pc (this_frame); | |
152 | if (pc && pc < AIX_TEXT_SEGMENT_BASE) | |
153 | return 1; | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | /* AIX signal handler frame unwinder */ | |
159 | ||
160 | static const struct frame_unwind aix_sighandle_frame_unwind = { | |
a154d838 | 161 | "rs6000 aix sighandle", |
cdcda965 SM |
162 | SIGTRAMP_FRAME, |
163 | default_frame_unwind_stop_reason, | |
164 | aix_sighandle_frame_this_id, | |
165 | aix_sighandle_frame_prev_register, | |
166 | NULL, | |
167 | aix_sighandle_frame_sniffer | |
168 | }; | |
7a61a01c UW |
169 | |
170 | /* Core file support. */ | |
171 | ||
172 | static struct ppc_reg_offsets rs6000_aix32_reg_offsets = | |
173 | { | |
174 | /* General-purpose registers. */ | |
175 | 208, /* r0_offset */ | |
f2db237a AM |
176 | 4, /* gpr_size */ |
177 | 4, /* xr_size */ | |
7a61a01c UW |
178 | 24, /* pc_offset */ |
179 | 28, /* ps_offset */ | |
180 | 32, /* cr_offset */ | |
181 | 36, /* lr_offset */ | |
182 | 40, /* ctr_offset */ | |
183 | 44, /* xer_offset */ | |
184 | 48, /* mq_offset */ | |
185 | ||
186 | /* Floating-point registers. */ | |
187 | 336, /* f0_offset */ | |
188 | 56, /* fpscr_offset */ | |
1d75a658 | 189 | 4 /* fpscr_size */ |
7a61a01c UW |
190 | }; |
191 | ||
192 | static struct ppc_reg_offsets rs6000_aix64_reg_offsets = | |
193 | { | |
194 | /* General-purpose registers. */ | |
195 | 0, /* r0_offset */ | |
f2db237a AM |
196 | 8, /* gpr_size */ |
197 | 4, /* xr_size */ | |
7a61a01c UW |
198 | 264, /* pc_offset */ |
199 | 256, /* ps_offset */ | |
200 | 288, /* cr_offset */ | |
201 | 272, /* lr_offset */ | |
202 | 280, /* ctr_offset */ | |
203 | 292, /* xer_offset */ | |
204 | -1, /* mq_offset */ | |
205 | ||
206 | /* Floating-point registers. */ | |
207 | 312, /* f0_offset */ | |
208 | 296, /* fpscr_offset */ | |
1d75a658 | 209 | 4 /* fpscr_size */ |
7a61a01c UW |
210 | }; |
211 | ||
212 | ||
213 | /* Supply register REGNUM in the general-purpose register set REGSET | |
214 | from the buffer specified by GREGS and LEN to register cache | |
215 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
216 | ||
217 | static void | |
218 | rs6000_aix_supply_regset (const struct regset *regset, | |
219 | struct regcache *regcache, int regnum, | |
220 | const void *gregs, size_t len) | |
221 | { | |
222 | ppc_supply_gregset (regset, regcache, regnum, gregs, len); | |
f2db237a | 223 | ppc_supply_fpregset (regset, regcache, regnum, gregs, len); |
7a61a01c UW |
224 | } |
225 | ||
226 | /* Collect register REGNUM in the general-purpose register set | |
0df8b418 | 227 | REGSET, from register cache REGCACHE into the buffer specified by |
7a61a01c UW |
228 | GREGS and LEN. If REGNUM is -1, do this for all registers in |
229 | REGSET. */ | |
230 | ||
231 | static void | |
232 | rs6000_aix_collect_regset (const struct regset *regset, | |
233 | const struct regcache *regcache, int regnum, | |
234 | void *gregs, size_t len) | |
235 | { | |
236 | ppc_collect_gregset (regset, regcache, regnum, gregs, len); | |
f2db237a | 237 | ppc_collect_fpregset (regset, regcache, regnum, gregs, len); |
7a61a01c UW |
238 | } |
239 | ||
240 | /* AIX register set. */ | |
241 | ||
3ca7dae4 | 242 | static const struct regset rs6000_aix32_regset = |
7a61a01c UW |
243 | { |
244 | &rs6000_aix32_reg_offsets, | |
245 | rs6000_aix_supply_regset, | |
246 | rs6000_aix_collect_regset, | |
247 | }; | |
248 | ||
3ca7dae4 | 249 | static const struct regset rs6000_aix64_regset = |
7a61a01c UW |
250 | { |
251 | &rs6000_aix64_reg_offsets, | |
252 | rs6000_aix_supply_regset, | |
253 | rs6000_aix_collect_regset, | |
254 | }; | |
255 | ||
23ea9aeb | 256 | /* Iterate over core file register note sections. */ |
7a61a01c | 257 | |
23ea9aeb AA |
258 | static void |
259 | rs6000_aix_iterate_over_regset_sections (struct gdbarch *gdbarch, | |
260 | iterate_over_regset_sections_cb *cb, | |
261 | void *cb_data, | |
262 | const struct regcache *regcache) | |
7a61a01c | 263 | { |
08106042 | 264 | ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch); |
345bd07c | 265 | if (tdep->wordsize == 4) |
a616bb94 | 266 | cb (".reg", 592, 592, &rs6000_aix32_regset, NULL, cb_data); |
7a61a01c | 267 | else |
a616bb94 | 268 | cb (".reg", 576, 576, &rs6000_aix64_regset, NULL, cb_data); |
7a61a01c UW |
269 | } |
270 | ||
271 | ||
0df8b418 | 272 | /* Pass the arguments in either registers, or in the stack. In RS/6000, |
4a7622d1 UW |
273 | the first eight words of the argument list (that might be less than |
274 | eight parameters if some parameters occupy more than one word) are | |
0df8b418 | 275 | passed in r3..r10 registers. Float and double parameters are |
4a7622d1 UW |
276 | passed in fpr's, in addition to that. Rest of the parameters if any |
277 | are passed in user stack. There might be cases in which half of the | |
278 | parameter is copied into registers, the other half is pushed into | |
279 | stack. | |
280 | ||
281 | Stack must be aligned on 64-bit boundaries when synthesizing | |
282 | function calls. | |
283 | ||
284 | If the function is returning a structure, then the return address is passed | |
285 | in r3, then the first 7 words of the parameters can be passed in registers, | |
286 | starting from r4. */ | |
287 | ||
288 | static CORE_ADDR | |
289 | rs6000_push_dummy_call (struct gdbarch *gdbarch, struct value *function, | |
290 | struct regcache *regcache, CORE_ADDR bp_addr, | |
291 | int nargs, struct value **args, CORE_ADDR sp, | |
cf84fa6b AH |
292 | function_call_return_method return_method, |
293 | CORE_ADDR struct_addr) | |
4a7622d1 | 294 | { |
08106042 | 295 | ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch); |
e17a4113 | 296 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4a7622d1 UW |
297 | int ii; |
298 | int len = 0; | |
299 | int argno; /* current argument number */ | |
300 | int argbytes; /* current argument byte */ | |
301 | gdb_byte tmp_buffer[50]; | |
302 | int f_argno = 0; /* current floating point argno */ | |
345bd07c | 303 | int wordsize = tdep->wordsize; |
4a7622d1 UW |
304 | CORE_ADDR func_addr = find_function_addr (function, NULL); |
305 | ||
306 | struct value *arg = 0; | |
307 | struct type *type; | |
308 | ||
309 | ULONGEST saved_sp; | |
310 | ||
311 | /* The calling convention this function implements assumes the | |
312 | processor has floating-point registers. We shouldn't be using it | |
313 | on PPC variants that lack them. */ | |
314 | gdb_assert (ppc_floating_point_unit_p (gdbarch)); | |
315 | ||
316 | /* The first eight words of ther arguments are passed in registers. | |
317 | Copy them appropriately. */ | |
318 | ii = 0; | |
319 | ||
320 | /* If the function is returning a `struct', then the first word | |
321 | (which will be passed in r3) is used for struct return address. | |
322 | In that case we should advance one word and start from r4 | |
323 | register to copy parameters. */ | |
cf84fa6b | 324 | if (return_method == return_method_struct) |
4a7622d1 UW |
325 | { |
326 | regcache_raw_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3, | |
327 | struct_addr); | |
328 | ii++; | |
329 | } | |
330 | ||
0df8b418 | 331 | /* effectively indirect call... gcc does... |
4a7622d1 UW |
332 | |
333 | return_val example( float, int); | |
334 | ||
335 | eabi: | |
336 | float in fp0, int in r3 | |
337 | offset of stack on overflow 8/16 | |
338 | for varargs, must go by type. | |
339 | power open: | |
340 | float in r3&r4, int in r5 | |
341 | offset of stack on overflow different | |
342 | both: | |
343 | return in r3 or f0. If no float, must study how gcc emulates floats; | |
0df8b418 | 344 | pay attention to arg promotion. |
4a7622d1 | 345 | User may have to cast\args to handle promotion correctly |
0df8b418 | 346 | since gdb won't know if prototype supplied or not. */ |
4a7622d1 UW |
347 | |
348 | for (argno = 0, argbytes = 0; argno < nargs && ii < 8; ++ii) | |
349 | { | |
350 | int reg_size = register_size (gdbarch, ii + 3); | |
351 | ||
352 | arg = args[argno]; | |
353 | type = check_typedef (value_type (arg)); | |
df86565b | 354 | len = type->length (); |
4a7622d1 | 355 | |
78134374 | 356 | if (type->code () == TYPE_CODE_FLT) |
4a7622d1 | 357 | { |
4a7622d1 | 358 | /* Floating point arguments are passed in fpr's, as well as gpr's. |
0df8b418 | 359 | There are 13 fpr's reserved for passing parameters. At this point |
36d1c68c JB |
360 | there is no way we would run out of them. |
361 | ||
362 | Always store the floating point value using the register's | |
363 | floating-point format. */ | |
364 | const int fp_regnum = tdep->ppc_fp0_regnum + 1 + f_argno; | |
0f068fb5 | 365 | gdb_byte reg_val[PPC_MAX_REGISTER_SIZE]; |
36d1c68c | 366 | struct type *reg_type = register_type (gdbarch, fp_regnum); |
4a7622d1 UW |
367 | |
368 | gdb_assert (len <= 8); | |
369 | ||
50888e42 SM |
370 | target_float_convert (value_contents (arg).data (), type, reg_val, |
371 | reg_type); | |
b66f5587 | 372 | regcache->cooked_write (fp_regnum, reg_val); |
4a7622d1 UW |
373 | ++f_argno; |
374 | } | |
375 | ||
376 | if (len > reg_size) | |
377 | { | |
378 | ||
379 | /* Argument takes more than one register. */ | |
380 | while (argbytes < len) | |
381 | { | |
0f068fb5 | 382 | gdb_byte word[PPC_MAX_REGISTER_SIZE]; |
4a7622d1 UW |
383 | memset (word, 0, reg_size); |
384 | memcpy (word, | |
50888e42 | 385 | ((char *) value_contents (arg).data ()) + argbytes, |
4a7622d1 | 386 | (len - argbytes) > reg_size |
dda83cd7 | 387 | ? reg_size : len - argbytes); |
b66f5587 | 388 | regcache->cooked_write (tdep->ppc_gp0_regnum + 3 + ii, word); |
4a7622d1 UW |
389 | ++ii, argbytes += reg_size; |
390 | ||
391 | if (ii >= 8) | |
392 | goto ran_out_of_registers_for_arguments; | |
393 | } | |
394 | argbytes = 0; | |
395 | --ii; | |
396 | } | |
397 | else | |
398 | { | |
399 | /* Argument can fit in one register. No problem. */ | |
0f068fb5 | 400 | gdb_byte word[PPC_MAX_REGISTER_SIZE]; |
4a7622d1 UW |
401 | |
402 | memset (word, 0, reg_size); | |
7aae1a86 AVK |
403 | if (type->code () == TYPE_CODE_INT |
404 | || type->code () == TYPE_CODE_ENUM | |
405 | || type->code () == TYPE_CODE_BOOL | |
406 | || type->code () == TYPE_CODE_CHAR) | |
407 | /* Sign or zero extend the "int" into a "word". */ | |
408 | store_unsigned_integer (word, reg_size, byte_order, | |
409 | unpack_long (type, value_contents (arg).data ())); | |
410 | else | |
411 | memcpy (word, value_contents (arg).data (), len); | |
b66f5587 | 412 | regcache->cooked_write (tdep->ppc_gp0_regnum + 3 +ii, word); |
4a7622d1 UW |
413 | } |
414 | ++argno; | |
415 | } | |
416 | ||
417 | ran_out_of_registers_for_arguments: | |
418 | ||
419 | regcache_cooked_read_unsigned (regcache, | |
420 | gdbarch_sp_regnum (gdbarch), | |
421 | &saved_sp); | |
422 | ||
423 | /* Location for 8 parameters are always reserved. */ | |
424 | sp -= wordsize * 8; | |
425 | ||
426 | /* Another six words for back chain, TOC register, link register, etc. */ | |
427 | sp -= wordsize * 6; | |
428 | ||
429 | /* Stack pointer must be quadword aligned. */ | |
430 | sp &= -16; | |
431 | ||
432 | /* If there are more arguments, allocate space for them in | |
433 | the stack, then push them starting from the ninth one. */ | |
434 | ||
435 | if ((argno < nargs) || argbytes) | |
436 | { | |
437 | int space = 0, jj; | |
438 | ||
439 | if (argbytes) | |
440 | { | |
441 | space += ((len - argbytes + 3) & -4); | |
442 | jj = argno + 1; | |
443 | } | |
444 | else | |
445 | jj = argno; | |
446 | ||
447 | for (; jj < nargs; ++jj) | |
448 | { | |
449 | struct value *val = args[jj]; | |
df86565b | 450 | space += ((value_type (val)->length ()) + 3) & -4; |
4a7622d1 UW |
451 | } |
452 | ||
453 | /* Add location required for the rest of the parameters. */ | |
454 | space = (space + 15) & -16; | |
455 | sp -= space; | |
456 | ||
457 | /* This is another instance we need to be concerned about | |
dda83cd7 SM |
458 | securing our stack space. If we write anything underneath %sp |
459 | (r1), we might conflict with the kernel who thinks he is free | |
460 | to use this area. So, update %sp first before doing anything | |
461 | else. */ | |
4a7622d1 UW |
462 | |
463 | regcache_raw_write_signed (regcache, | |
464 | gdbarch_sp_regnum (gdbarch), sp); | |
465 | ||
466 | /* If the last argument copied into the registers didn't fit there | |
dda83cd7 | 467 | completely, push the rest of it into stack. */ |
4a7622d1 UW |
468 | |
469 | if (argbytes) | |
470 | { | |
471 | write_memory (sp + 24 + (ii * 4), | |
50888e42 | 472 | value_contents (arg).data () + argbytes, |
4a7622d1 UW |
473 | len - argbytes); |
474 | ++argno; | |
475 | ii += ((len - argbytes + 3) & -4) / 4; | |
476 | } | |
477 | ||
478 | /* Push the rest of the arguments into stack. */ | |
479 | for (; argno < nargs; ++argno) | |
480 | { | |
481 | ||
482 | arg = args[argno]; | |
483 | type = check_typedef (value_type (arg)); | |
df86565b | 484 | len = type->length (); |
4a7622d1 UW |
485 | |
486 | ||
487 | /* Float types should be passed in fpr's, as well as in the | |
dda83cd7 | 488 | stack. */ |
78134374 | 489 | if (type->code () == TYPE_CODE_FLT && f_argno < 13) |
4a7622d1 UW |
490 | { |
491 | ||
492 | gdb_assert (len <= 8); | |
493 | ||
b66f5587 | 494 | regcache->cooked_write (tdep->ppc_fp0_regnum + 1 + f_argno, |
50888e42 | 495 | value_contents (arg).data ()); |
4a7622d1 UW |
496 | ++f_argno; |
497 | } | |
498 | ||
50888e42 | 499 | write_memory (sp + 24 + (ii * 4), value_contents (arg).data (), len); |
4a7622d1 UW |
500 | ii += ((len + 3) & -4) / 4; |
501 | } | |
502 | } | |
503 | ||
504 | /* Set the stack pointer. According to the ABI, the SP is meant to | |
505 | be set _before_ the corresponding stack space is used. On AIX, | |
506 | this even applies when the target has been completely stopped! | |
507 | Not doing this can lead to conflicts with the kernel which thinks | |
508 | that it still has control over this not-yet-allocated stack | |
509 | region. */ | |
510 | regcache_raw_write_signed (regcache, gdbarch_sp_regnum (gdbarch), sp); | |
511 | ||
512 | /* Set back chain properly. */ | |
e17a4113 | 513 | store_unsigned_integer (tmp_buffer, wordsize, byte_order, saved_sp); |
4a7622d1 UW |
514 | write_memory (sp, tmp_buffer, wordsize); |
515 | ||
516 | /* Point the inferior function call's return address at the dummy's | |
517 | breakpoint. */ | |
518 | regcache_raw_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr); | |
519 | ||
4d1eb6b4 JB |
520 | /* Set the TOC register value. */ |
521 | regcache_raw_write_signed (regcache, tdep->ppc_toc_regnum, | |
522 | solib_aix_get_toc_value (func_addr)); | |
4a7622d1 UW |
523 | |
524 | target_store_registers (regcache, -1); | |
525 | return sp; | |
526 | } | |
527 | ||
528 | static enum return_value_convention | |
6a3a010b | 529 | rs6000_return_value (struct gdbarch *gdbarch, struct value *function, |
4a7622d1 UW |
530 | struct type *valtype, struct regcache *regcache, |
531 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
532 | { | |
08106042 | 533 | ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch); |
e17a4113 | 534 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4a7622d1 UW |
535 | |
536 | /* The calling convention this function implements assumes the | |
537 | processor has floating-point registers. We shouldn't be using it | |
538 | on PowerPC variants that lack them. */ | |
539 | gdb_assert (ppc_floating_point_unit_p (gdbarch)); | |
540 | ||
541 | /* AltiVec extension: Functions that declare a vector data type as a | |
542 | return value place that return value in VR2. */ | |
bd63c870 | 543 | if (valtype->code () == TYPE_CODE_ARRAY && valtype->is_vector () |
df86565b | 544 | && valtype->length () == 16) |
4a7622d1 UW |
545 | { |
546 | if (readbuf) | |
dca08e1f | 547 | regcache->cooked_read (tdep->ppc_vr0_regnum + 2, readbuf); |
4a7622d1 | 548 | if (writebuf) |
b66f5587 | 549 | regcache->cooked_write (tdep->ppc_vr0_regnum + 2, writebuf); |
4a7622d1 UW |
550 | |
551 | return RETURN_VALUE_REGISTER_CONVENTION; | |
552 | } | |
553 | ||
554 | /* If the called subprogram returns an aggregate, there exists an | |
555 | implicit first argument, whose value is the address of a caller- | |
556 | allocated buffer into which the callee is assumed to store its | |
0df8b418 | 557 | return value. All explicit parameters are appropriately |
4a7622d1 | 558 | relabeled. */ |
78134374 SM |
559 | if (valtype->code () == TYPE_CODE_STRUCT |
560 | || valtype->code () == TYPE_CODE_UNION | |
561 | || valtype->code () == TYPE_CODE_ARRAY) | |
4a7622d1 UW |
562 | return RETURN_VALUE_STRUCT_CONVENTION; |
563 | ||
564 | /* Scalar floating-point values are returned in FPR1 for float or | |
565 | double, and in FPR1:FPR2 for quadword precision. Fortran | |
566 | complex*8 and complex*16 are returned in FPR1:FPR2, and | |
567 | complex*32 is returned in FPR1:FPR4. */ | |
78134374 | 568 | if (valtype->code () == TYPE_CODE_FLT |
df86565b | 569 | && (valtype->length () == 4 || valtype->length () == 8)) |
4a7622d1 UW |
570 | { |
571 | struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum); | |
572 | gdb_byte regval[8]; | |
573 | ||
574 | /* FIXME: kettenis/2007-01-01: Add support for quadword | |
575 | precision and complex. */ | |
576 | ||
577 | if (readbuf) | |
578 | { | |
dca08e1f | 579 | regcache->cooked_read (tdep->ppc_fp0_regnum + 1, regval); |
3b2ca824 | 580 | target_float_convert (regval, regtype, readbuf, valtype); |
4a7622d1 UW |
581 | } |
582 | if (writebuf) | |
583 | { | |
3b2ca824 | 584 | target_float_convert (writebuf, valtype, regval, regtype); |
b66f5587 | 585 | regcache->cooked_write (tdep->ppc_fp0_regnum + 1, regval); |
4a7622d1 UW |
586 | } |
587 | ||
588 | return RETURN_VALUE_REGISTER_CONVENTION; | |
589 | } | |
590 | ||
591 | /* Values of the types int, long, short, pointer, and char (length | |
592 | is less than or equal to four bytes), as well as bit values of | |
593 | lengths less than or equal to 32 bits, must be returned right | |
594 | justified in GPR3 with signed values sign extended and unsigned | |
595 | values zero extended, as necessary. */ | |
df86565b | 596 | if (valtype->length () <= tdep->wordsize) |
4a7622d1 UW |
597 | { |
598 | if (readbuf) | |
599 | { | |
600 | ULONGEST regval; | |
601 | ||
602 | /* For reading we don't have to worry about sign extension. */ | |
603 | regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3, | |
604 | ®val); | |
df86565b | 605 | store_unsigned_integer (readbuf, valtype->length (), byte_order, |
e17a4113 | 606 | regval); |
4a7622d1 UW |
607 | } |
608 | if (writebuf) | |
609 | { | |
610 | /* For writing, use unpack_long since that should handle any | |
611 | required sign extension. */ | |
612 | regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3, | |
613 | unpack_long (valtype, writebuf)); | |
614 | } | |
615 | ||
616 | return RETURN_VALUE_REGISTER_CONVENTION; | |
617 | } | |
618 | ||
619 | /* Eight-byte non-floating-point scalar values must be returned in | |
620 | GPR3:GPR4. */ | |
621 | ||
df86565b | 622 | if (valtype->length () == 8) |
4a7622d1 | 623 | { |
78134374 | 624 | gdb_assert (valtype->code () != TYPE_CODE_FLT); |
4a7622d1 UW |
625 | gdb_assert (tdep->wordsize == 4); |
626 | ||
627 | if (readbuf) | |
628 | { | |
629 | gdb_byte regval[8]; | |
630 | ||
dca08e1f SM |
631 | regcache->cooked_read (tdep->ppc_gp0_regnum + 3, regval); |
632 | regcache->cooked_read (tdep->ppc_gp0_regnum + 4, regval + 4); | |
4a7622d1 UW |
633 | memcpy (readbuf, regval, 8); |
634 | } | |
635 | if (writebuf) | |
636 | { | |
b66f5587 SM |
637 | regcache->cooked_write (tdep->ppc_gp0_regnum + 3, writebuf); |
638 | regcache->cooked_write (tdep->ppc_gp0_regnum + 4, writebuf + 4); | |
4a7622d1 UW |
639 | } |
640 | ||
641 | return RETURN_VALUE_REGISTER_CONVENTION; | |
642 | } | |
643 | ||
644 | return RETURN_VALUE_STRUCT_CONVENTION; | |
645 | } | |
646 | ||
647 | /* Support for CONVERT_FROM_FUNC_PTR_ADDR (ARCH, ADDR, TARG). | |
648 | ||
649 | Usually a function pointer's representation is simply the address | |
0df8b418 MS |
650 | of the function. On the RS/6000 however, a function pointer is |
651 | represented by a pointer to an OPD entry. This OPD entry contains | |
4a7622d1 UW |
652 | three words, the first word is the address of the function, the |
653 | second word is the TOC pointer (r2), and the third word is the | |
654 | static chain value. Throughout GDB it is currently assumed that a | |
655 | function pointer contains the address of the function, which is not | |
656 | easy to fix. In addition, the conversion of a function address to | |
657 | a function pointer would require allocation of an OPD entry in the | |
658 | inferior's memory space, with all its drawbacks. To be able to | |
659 | call C++ virtual methods in the inferior (which are called via | |
660 | function pointers), find_function_addr uses this function to get the | |
661 | function address from a function pointer. */ | |
662 | ||
663 | /* Return real function address if ADDR (a function pointer) is in the data | |
664 | space and is therefore a special function pointer. */ | |
665 | ||
666 | static CORE_ADDR | |
667 | rs6000_convert_from_func_ptr_addr (struct gdbarch *gdbarch, | |
668 | CORE_ADDR addr, | |
669 | struct target_ops *targ) | |
670 | { | |
08106042 | 671 | ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch); |
e17a4113 | 672 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4a7622d1 UW |
673 | struct obj_section *s; |
674 | ||
675 | s = find_pc_section (addr); | |
4a7622d1 | 676 | |
40adab56 JB |
677 | /* Normally, functions live inside a section that is executable. |
678 | So, if ADDR points to a non-executable section, then treat it | |
679 | as a function descriptor and return the target address iff | |
680 | the target address itself points to a section that is executable. */ | |
681 | if (s && (s->the_bfd_section->flags & SEC_CODE) == 0) | |
682 | { | |
57174f31 | 683 | CORE_ADDR pc = 0; |
2971b56b | 684 | struct obj_section *pc_section; |
2971b56b | 685 | |
a70b8144 | 686 | try |
dda83cd7 SM |
687 | { |
688 | pc = read_memory_unsigned_integer (addr, tdep->wordsize, byte_order); | |
689 | } | |
230d2906 | 690 | catch (const gdb_exception_error &e) |
dda83cd7 SM |
691 | { |
692 | /* An error occured during reading. Probably a memory error | |
693 | due to the section not being loaded yet. This address | |
694 | cannot be a function descriptor. */ | |
695 | return addr; | |
696 | } | |
492d29ea | 697 | |
2971b56b | 698 | pc_section = find_pc_section (pc); |
40adab56 JB |
699 | |
700 | if (pc_section && (pc_section->the_bfd_section->flags & SEC_CODE)) | |
dda83cd7 | 701 | return pc; |
40adab56 JB |
702 | } |
703 | ||
704 | return addr; | |
4a7622d1 UW |
705 | } |
706 | ||
707 | ||
708 | /* Calculate the destination of a branch/jump. Return -1 if not a branch. */ | |
709 | ||
710 | static CORE_ADDR | |
41e26ad3 | 711 | branch_dest (struct regcache *regcache, int opcode, int instr, |
4a7622d1 UW |
712 | CORE_ADDR pc, CORE_ADDR safety) |
713 | { | |
ac7936df | 714 | struct gdbarch *gdbarch = regcache->arch (); |
08106042 | 715 | ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch); |
e17a4113 | 716 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4a7622d1 UW |
717 | CORE_ADDR dest; |
718 | int immediate; | |
719 | int absolute; | |
720 | int ext_op; | |
721 | ||
722 | absolute = (int) ((instr >> 1) & 1); | |
723 | ||
724 | switch (opcode) | |
725 | { | |
726 | case 18: | |
727 | immediate = ((instr & ~3) << 6) >> 6; /* br unconditional */ | |
728 | if (absolute) | |
729 | dest = immediate; | |
730 | else | |
731 | dest = pc + immediate; | |
732 | break; | |
733 | ||
734 | case 16: | |
735 | immediate = ((instr & ~3) << 16) >> 16; /* br conditional */ | |
736 | if (absolute) | |
737 | dest = immediate; | |
738 | else | |
739 | dest = pc + immediate; | |
740 | break; | |
741 | ||
742 | case 19: | |
743 | ext_op = (instr >> 1) & 0x3ff; | |
744 | ||
745 | if (ext_op == 16) /* br conditional register */ | |
746 | { | |
dda83cd7 | 747 | dest = regcache_raw_get_unsigned (regcache, tdep->ppc_lr_regnum) & ~3; |
4a7622d1 UW |
748 | |
749 | /* If we are about to return from a signal handler, dest is | |
750 | something like 0x3c90. The current frame is a signal handler | |
751 | caller frame, upon completion of the sigreturn system call | |
752 | execution will return to the saved PC in the frame. */ | |
753 | if (dest < AIX_TEXT_SEGMENT_BASE) | |
41e26ad3 | 754 | { |
bd2b40ac | 755 | frame_info_ptr frame = get_current_frame (); |
41e26ad3 YQ |
756 | |
757 | dest = read_memory_unsigned_integer | |
758 | (get_frame_base (frame) + SIG_FRAME_PC_OFFSET, | |
759 | tdep->wordsize, byte_order); | |
760 | } | |
4a7622d1 UW |
761 | } |
762 | ||
763 | else if (ext_op == 528) /* br cond to count reg */ | |
764 | { | |
dda83cd7 | 765 | dest = regcache_raw_get_unsigned (regcache, |
41e26ad3 | 766 | tdep->ppc_ctr_regnum) & ~3; |
4a7622d1 UW |
767 | |
768 | /* If we are about to execute a system call, dest is something | |
769 | like 0x22fc or 0x3b00. Upon completion the system call | |
770 | will return to the address in the link register. */ | |
771 | if (dest < AIX_TEXT_SEGMENT_BASE) | |
dda83cd7 | 772 | dest = regcache_raw_get_unsigned (regcache, |
41e26ad3 | 773 | tdep->ppc_lr_regnum) & ~3; |
4a7622d1 UW |
774 | } |
775 | else | |
776 | return -1; | |
777 | break; | |
778 | ||
779 | default: | |
780 | return -1; | |
781 | } | |
782 | return (dest < AIX_TEXT_SEGMENT_BASE) ? safety : dest; | |
783 | } | |
784 | ||
785 | /* AIX does not support PT_STEP. Simulate it. */ | |
786 | ||
a0ff9e1a | 787 | static std::vector<CORE_ADDR> |
f5ea389a | 788 | rs6000_software_single_step (struct regcache *regcache) |
4a7622d1 | 789 | { |
ac7936df | 790 | struct gdbarch *gdbarch = regcache->arch (); |
e17a4113 | 791 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4a7622d1 UW |
792 | int ii, insn; |
793 | CORE_ADDR loc; | |
794 | CORE_ADDR breaks[2]; | |
795 | int opcode; | |
796 | ||
41e26ad3 | 797 | loc = regcache_read_pc (regcache); |
4a7622d1 | 798 | |
e17a4113 | 799 | insn = read_memory_integer (loc, 4, byte_order); |
4a7622d1 | 800 | |
a0ff9e1a SM |
801 | std::vector<CORE_ADDR> next_pcs = ppc_deal_with_atomic_sequence (regcache); |
802 | if (!next_pcs.empty ()) | |
93f9a11f | 803 | return next_pcs; |
4a7622d1 UW |
804 | |
805 | breaks[0] = loc + PPC_INSN_SIZE; | |
806 | opcode = insn >> 26; | |
41e26ad3 | 807 | breaks[1] = branch_dest (regcache, opcode, insn, loc, breaks[0]); |
4a7622d1 | 808 | |
0df8b418 | 809 | /* Don't put two breakpoints on the same address. */ |
4a7622d1 UW |
810 | if (breaks[1] == breaks[0]) |
811 | breaks[1] = -1; | |
812 | ||
813 | for (ii = 0; ii < 2; ++ii) | |
814 | { | |
0df8b418 | 815 | /* ignore invalid breakpoint. */ |
4a7622d1 UW |
816 | if (breaks[ii] == -1) |
817 | continue; | |
a0ff9e1a SM |
818 | |
819 | next_pcs.push_back (breaks[ii]); | |
4a7622d1 UW |
820 | } |
821 | ||
0df8b418 | 822 | errno = 0; /* FIXME, don't ignore errors! */ |
4a7622d1 | 823 | /* What errors? {read,write}_memory call error(). */ |
93f9a11f | 824 | return next_pcs; |
4a7622d1 UW |
825 | } |
826 | ||
38a69d0a JB |
827 | /* Implement the "auto_wide_charset" gdbarch method for this platform. */ |
828 | ||
829 | static const char * | |
830 | rs6000_aix_auto_wide_charset (void) | |
831 | { | |
832 | return "UTF-16"; | |
833 | } | |
834 | ||
beb4b03c JB |
835 | /* Implement an osabi sniffer for RS6000/AIX. |
836 | ||
837 | This function assumes that ABFD's flavour is XCOFF. In other words, | |
838 | it should be registered as a sniffer for bfd_target_xcoff_flavour | |
839 | objfiles only. A failed assertion will be raised if this condition | |
840 | is not met. */ | |
841 | ||
1f82754b JB |
842 | static enum gdb_osabi |
843 | rs6000_aix_osabi_sniffer (bfd *abfd) | |
844 | { | |
beb4b03c | 845 | gdb_assert (bfd_get_flavour (abfd) == bfd_target_xcoff_flavour); |
1f82754b | 846 | |
d5367fe1 JB |
847 | /* The only noticeable difference between Lynx178 XCOFF files and |
848 | AIX XCOFF files comes from the fact that there are no shared | |
849 | libraries on Lynx178. On AIX, we are betting that an executable | |
850 | linked with no shared library will never exist. */ | |
851 | if (xcoff_get_n_import_files (abfd) <= 0) | |
852 | return GDB_OSABI_UNKNOWN; | |
853 | ||
beb4b03c | 854 | return GDB_OSABI_AIX; |
1f82754b JB |
855 | } |
856 | ||
356a5233 JB |
857 | /* A structure encoding the offset and size of a field within |
858 | a struct. */ | |
859 | ||
c01e2836 | 860 | struct ldinfo_field |
356a5233 JB |
861 | { |
862 | int offset; | |
863 | int size; | |
864 | }; | |
865 | ||
866 | /* A structure describing the layout of all the fields of interest | |
867 | in AIX's struct ld_info. Each field in this struct corresponds | |
868 | to the field of the same name in struct ld_info. */ | |
869 | ||
870 | struct ld_info_desc | |
871 | { | |
c01e2836 TT |
872 | struct ldinfo_field ldinfo_next; |
873 | struct ldinfo_field ldinfo_fd; | |
874 | struct ldinfo_field ldinfo_textorg; | |
875 | struct ldinfo_field ldinfo_textsize; | |
876 | struct ldinfo_field ldinfo_dataorg; | |
877 | struct ldinfo_field ldinfo_datasize; | |
878 | struct ldinfo_field ldinfo_filename; | |
356a5233 JB |
879 | }; |
880 | ||
881 | /* The following data has been generated by compiling and running | |
882 | the following program on AIX 5.3. */ | |
883 | ||
884 | #if 0 | |
1c432e72 JB |
885 | #include <stddef.h> |
886 | #include <stdio.h> | |
887 | #define __LDINFO_PTRACE32__ | |
888 | #define __LDINFO_PTRACE64__ | |
889 | #include <sys/ldr.h> | |
890 | ||
891 | #define pinfo(type,member) \ | |
892 | { \ | |
893 | struct type ldi = {0}; \ | |
dda83cd7 | 894 | \ |
1c432e72 | 895 | printf (" {%d, %d},\t/* %s */\n", \ |
dda83cd7 SM |
896 | offsetof (struct type, member), \ |
897 | sizeof (ldi.member), \ | |
898 | #member); \ | |
1c432e72 JB |
899 | } \ |
900 | while (0) | |
901 | ||
902 | int | |
903 | main (void) | |
904 | { | |
905 | printf ("static const struct ld_info_desc ld_info32_desc =\n{\n"); | |
906 | pinfo (__ld_info32, ldinfo_next); | |
907 | pinfo (__ld_info32, ldinfo_fd); | |
908 | pinfo (__ld_info32, ldinfo_textorg); | |
909 | pinfo (__ld_info32, ldinfo_textsize); | |
910 | pinfo (__ld_info32, ldinfo_dataorg); | |
911 | pinfo (__ld_info32, ldinfo_datasize); | |
912 | pinfo (__ld_info32, ldinfo_filename); | |
913 | printf ("};\n"); | |
914 | ||
915 | printf ("\n"); | |
916 | ||
917 | printf ("static const struct ld_info_desc ld_info64_desc =\n{\n"); | |
918 | pinfo (__ld_info64, ldinfo_next); | |
919 | pinfo (__ld_info64, ldinfo_fd); | |
920 | pinfo (__ld_info64, ldinfo_textorg); | |
921 | pinfo (__ld_info64, ldinfo_textsize); | |
922 | pinfo (__ld_info64, ldinfo_dataorg); | |
923 | pinfo (__ld_info64, ldinfo_datasize); | |
924 | pinfo (__ld_info64, ldinfo_filename); | |
925 | printf ("};\n"); | |
926 | ||
927 | return 0; | |
928 | } | |
356a5233 JB |
929 | #endif /* 0 */ |
930 | ||
931 | /* Layout of the 32bit version of struct ld_info. */ | |
932 | ||
933 | static const struct ld_info_desc ld_info32_desc = | |
934 | { | |
935 | {0, 4}, /* ldinfo_next */ | |
936 | {4, 4}, /* ldinfo_fd */ | |
937 | {8, 4}, /* ldinfo_textorg */ | |
938 | {12, 4}, /* ldinfo_textsize */ | |
939 | {16, 4}, /* ldinfo_dataorg */ | |
940 | {20, 4}, /* ldinfo_datasize */ | |
941 | {24, 2}, /* ldinfo_filename */ | |
942 | }; | |
943 | ||
944 | /* Layout of the 64bit version of struct ld_info. */ | |
945 | ||
946 | static const struct ld_info_desc ld_info64_desc = | |
947 | { | |
948 | {0, 4}, /* ldinfo_next */ | |
949 | {8, 4}, /* ldinfo_fd */ | |
950 | {16, 8}, /* ldinfo_textorg */ | |
951 | {24, 8}, /* ldinfo_textsize */ | |
952 | {32, 8}, /* ldinfo_dataorg */ | |
953 | {40, 8}, /* ldinfo_datasize */ | |
954 | {48, 2}, /* ldinfo_filename */ | |
955 | }; | |
956 | ||
957 | /* A structured representation of one entry read from the ld_info | |
958 | binary data provided by the AIX loader. */ | |
959 | ||
960 | struct ld_info | |
961 | { | |
962 | ULONGEST next; | |
963 | int fd; | |
964 | CORE_ADDR textorg; | |
965 | ULONGEST textsize; | |
966 | CORE_ADDR dataorg; | |
967 | ULONGEST datasize; | |
968 | char *filename; | |
969 | char *member_name; | |
970 | }; | |
971 | ||
972 | /* Return a struct ld_info object corresponding to the entry at | |
973 | LDI_BUF. | |
974 | ||
975 | Note that the filename and member_name strings still point | |
976 | to the data in LDI_BUF. So LDI_BUF must not be deallocated | |
977 | while the struct ld_info object returned is in use. */ | |
978 | ||
979 | static struct ld_info | |
980 | rs6000_aix_extract_ld_info (struct gdbarch *gdbarch, | |
981 | const gdb_byte *ldi_buf) | |
982 | { | |
08106042 | 983 | ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch); |
356a5233 JB |
984 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
985 | struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr; | |
986 | const struct ld_info_desc desc | |
987 | = tdep->wordsize == 8 ? ld_info64_desc : ld_info32_desc; | |
988 | struct ld_info info; | |
989 | ||
990 | info.next = extract_unsigned_integer (ldi_buf + desc.ldinfo_next.offset, | |
991 | desc.ldinfo_next.size, | |
992 | byte_order); | |
993 | info.fd = extract_signed_integer (ldi_buf + desc.ldinfo_fd.offset, | |
994 | desc.ldinfo_fd.size, | |
995 | byte_order); | |
996 | info.textorg = extract_typed_address (ldi_buf + desc.ldinfo_textorg.offset, | |
997 | ptr_type); | |
998 | info.textsize | |
999 | = extract_unsigned_integer (ldi_buf + desc.ldinfo_textsize.offset, | |
1000 | desc.ldinfo_textsize.size, | |
1001 | byte_order); | |
1002 | info.dataorg = extract_typed_address (ldi_buf + desc.ldinfo_dataorg.offset, | |
1003 | ptr_type); | |
1004 | info.datasize | |
1005 | = extract_unsigned_integer (ldi_buf + desc.ldinfo_datasize.offset, | |
1006 | desc.ldinfo_datasize.size, | |
1007 | byte_order); | |
1008 | info.filename = (char *) ldi_buf + desc.ldinfo_filename.offset; | |
1009 | info.member_name = info.filename + strlen (info.filename) + 1; | |
1010 | ||
1011 | return info; | |
1012 | } | |
1013 | ||
1014 | /* Append to OBJSTACK an XML string description of the shared library | |
1015 | corresponding to LDI, following the TARGET_OBJECT_LIBRARIES_AIX | |
1016 | format. */ | |
1017 | ||
1018 | static void | |
1019 | rs6000_aix_shared_library_to_xml (struct ld_info *ldi, | |
1020 | struct obstack *obstack) | |
1021 | { | |
356a5233 | 1022 | obstack_grow_str (obstack, "<library name=\""); |
5e187554 SM |
1023 | std::string p = xml_escape_text (ldi->filename); |
1024 | obstack_grow_str (obstack, p.c_str ()); | |
356a5233 JB |
1025 | obstack_grow_str (obstack, "\""); |
1026 | ||
1027 | if (ldi->member_name[0] != '\0') | |
1028 | { | |
1029 | obstack_grow_str (obstack, " member=\""); | |
1030 | p = xml_escape_text (ldi->member_name); | |
5e187554 | 1031 | obstack_grow_str (obstack, p.c_str ()); |
356a5233 JB |
1032 | obstack_grow_str (obstack, "\""); |
1033 | } | |
1034 | ||
1035 | obstack_grow_str (obstack, " text_addr=\""); | |
1036 | obstack_grow_str (obstack, core_addr_to_string (ldi->textorg)); | |
1037 | obstack_grow_str (obstack, "\""); | |
1038 | ||
1039 | obstack_grow_str (obstack, " text_size=\""); | |
1040 | obstack_grow_str (obstack, pulongest (ldi->textsize)); | |
1041 | obstack_grow_str (obstack, "\""); | |
1042 | ||
1043 | obstack_grow_str (obstack, " data_addr=\""); | |
1044 | obstack_grow_str (obstack, core_addr_to_string (ldi->dataorg)); | |
1045 | obstack_grow_str (obstack, "\""); | |
1046 | ||
1047 | obstack_grow_str (obstack, " data_size=\""); | |
1048 | obstack_grow_str (obstack, pulongest (ldi->datasize)); | |
1049 | obstack_grow_str (obstack, "\""); | |
1050 | ||
1051 | obstack_grow_str (obstack, "></library>"); | |
1052 | } | |
1053 | ||
1054 | /* Convert the ld_info binary data provided by the AIX loader into | |
1055 | an XML representation following the TARGET_OBJECT_LIBRARIES_AIX | |
1056 | format. | |
1057 | ||
1058 | LDI_BUF is a buffer containing the ld_info data. | |
1059 | READBUF, OFFSET and LEN follow the same semantics as target_ops' | |
1060 | to_xfer_partial target_ops method. | |
1061 | ||
1062 | If CLOSE_LDINFO_FD is nonzero, then this routine also closes | |
1063 | the ldinfo_fd file descriptor. This is useful when the ldinfo | |
1064 | data is obtained via ptrace, as ptrace opens a file descriptor | |
1065 | for each and every entry; but we cannot use this descriptor | |
1066 | as the consumer of the XML library list might live in a different | |
1067 | process. */ | |
1068 | ||
c09f20e4 | 1069 | ULONGEST |
356a5233 | 1070 | rs6000_aix_ld_info_to_xml (struct gdbarch *gdbarch, const gdb_byte *ldi_buf, |
b55e14c7 | 1071 | gdb_byte *readbuf, ULONGEST offset, ULONGEST len, |
356a5233 JB |
1072 | int close_ldinfo_fd) |
1073 | { | |
1074 | struct obstack obstack; | |
1075 | const char *buf; | |
c09f20e4 | 1076 | ULONGEST len_avail; |
356a5233 JB |
1077 | |
1078 | obstack_init (&obstack); | |
1079 | obstack_grow_str (&obstack, "<library-list-aix version=\"1.0\">\n"); | |
1080 | ||
1081 | while (1) | |
1082 | { | |
1083 | struct ld_info ldi = rs6000_aix_extract_ld_info (gdbarch, ldi_buf); | |
1084 | ||
1085 | rs6000_aix_shared_library_to_xml (&ldi, &obstack); | |
1086 | if (close_ldinfo_fd) | |
1087 | close (ldi.fd); | |
1088 | ||
1089 | if (!ldi.next) | |
1090 | break; | |
1091 | ldi_buf = ldi_buf + ldi.next; | |
1092 | } | |
1093 | ||
1094 | obstack_grow_str0 (&obstack, "</library-list-aix>\n"); | |
1095 | ||
224c3ddb | 1096 | buf = (const char *) obstack_finish (&obstack); |
356a5233 JB |
1097 | len_avail = strlen (buf); |
1098 | if (offset >= len_avail) | |
1099 | len= 0; | |
1100 | else | |
1101 | { | |
1102 | if (len > len_avail - offset) | |
dda83cd7 | 1103 | len = len_avail - offset; |
356a5233 JB |
1104 | memcpy (readbuf, buf + offset, len); |
1105 | } | |
1106 | ||
1107 | obstack_free (&obstack, NULL); | |
1108 | return len; | |
1109 | } | |
1110 | ||
1111 | /* Implement the core_xfer_shared_libraries_aix gdbarch method. */ | |
1112 | ||
c09f20e4 | 1113 | static ULONGEST |
356a5233 JB |
1114 | rs6000_aix_core_xfer_shared_libraries_aix (struct gdbarch *gdbarch, |
1115 | gdb_byte *readbuf, | |
1116 | ULONGEST offset, | |
7ec1862d | 1117 | ULONGEST len) |
356a5233 JB |
1118 | { |
1119 | struct bfd_section *ldinfo_sec; | |
1120 | int ldinfo_size; | |
356a5233 JB |
1121 | |
1122 | ldinfo_sec = bfd_get_section_by_name (core_bfd, ".ldinfo"); | |
1123 | if (ldinfo_sec == NULL) | |
1124 | error (_("cannot find .ldinfo section from core file: %s"), | |
1125 | bfd_errmsg (bfd_get_error ())); | |
fd361982 | 1126 | ldinfo_size = bfd_section_size (ldinfo_sec); |
356a5233 | 1127 | |
984c7238 | 1128 | gdb::byte_vector ldinfo_buf (ldinfo_size); |
356a5233 JB |
1129 | |
1130 | if (! bfd_get_section_contents (core_bfd, ldinfo_sec, | |
984c7238 | 1131 | ldinfo_buf.data (), 0, ldinfo_size)) |
356a5233 JB |
1132 | error (_("unable to read .ldinfo section from core file: %s"), |
1133 | bfd_errmsg (bfd_get_error ())); | |
1134 | ||
984c7238 TT |
1135 | return rs6000_aix_ld_info_to_xml (gdbarch, ldinfo_buf.data (), readbuf, |
1136 | offset, len, 0); | |
356a5233 JB |
1137 | } |
1138 | ||
1f82754b JB |
1139 | static void |
1140 | rs6000_aix_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1141 | { | |
08106042 | 1142 | ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch); |
4a7622d1 | 1143 | |
1f82754b JB |
1144 | /* RS6000/AIX does not support PT_STEP. Has to be simulated. */ |
1145 | set_gdbarch_software_single_step (gdbarch, rs6000_software_single_step); | |
6f7f3f0d | 1146 | |
2454a024 | 1147 | /* Displaced stepping is currently not supported in combination with |
187b041e SM |
1148 | software single-stepping. These override the values set by |
1149 | rs6000_gdbarch_init. */ | |
2454a024 UW |
1150 | set_gdbarch_displaced_step_copy_insn (gdbarch, NULL); |
1151 | set_gdbarch_displaced_step_fixup (gdbarch, NULL); | |
187b041e SM |
1152 | set_gdbarch_displaced_step_prepare (gdbarch, NULL); |
1153 | set_gdbarch_displaced_step_finish (gdbarch, NULL); | |
2454a024 | 1154 | |
4a7622d1 UW |
1155 | set_gdbarch_push_dummy_call (gdbarch, rs6000_push_dummy_call); |
1156 | set_gdbarch_return_value (gdbarch, rs6000_return_value); | |
1157 | set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
1158 | ||
1159 | /* Handle RS/6000 function pointers (which are really function | |
1160 | descriptors). */ | |
1161 | set_gdbarch_convert_from_func_ptr_addr | |
1162 | (gdbarch, rs6000_convert_from_func_ptr_addr); | |
1163 | ||
7a61a01c | 1164 | /* Core file support. */ |
23ea9aeb AA |
1165 | set_gdbarch_iterate_over_regset_sections |
1166 | (gdbarch, rs6000_aix_iterate_over_regset_sections); | |
356a5233 JB |
1167 | set_gdbarch_core_xfer_shared_libraries_aix |
1168 | (gdbarch, rs6000_aix_core_xfer_shared_libraries_aix); | |
7a61a01c | 1169 | |
4a7622d1 UW |
1170 | if (tdep->wordsize == 8) |
1171 | tdep->lr_frame_offset = 16; | |
1172 | else | |
1173 | tdep->lr_frame_offset = 8; | |
1174 | ||
1175 | if (tdep->wordsize == 4) | |
1176 | /* PowerOpen / AIX 32 bit. The saved area or red zone consists of | |
1177 | 19 4 byte GPRS + 18 8 byte FPRs giving a total of 220 bytes. | |
1178 | Problem is, 220 isn't frame (16 byte) aligned. Round it up to | |
1179 | 224. */ | |
1180 | set_gdbarch_frame_red_zone_size (gdbarch, 224); | |
1181 | else | |
1182 | set_gdbarch_frame_red_zone_size (gdbarch, 0); | |
38a69d0a | 1183 | |
53375380 PA |
1184 | if (tdep->wordsize == 8) |
1185 | set_gdbarch_wchar_bit (gdbarch, 32); | |
1186 | else | |
1187 | set_gdbarch_wchar_bit (gdbarch, 16); | |
1188 | set_gdbarch_wchar_signed (gdbarch, 0); | |
38a69d0a | 1189 | set_gdbarch_auto_wide_charset (gdbarch, rs6000_aix_auto_wide_charset); |
4d1eb6b4 | 1190 | |
9e468e95 | 1191 | set_gdbarch_so_ops (gdbarch, &solib_aix_so_ops); |
cdcda965 | 1192 | frame_unwind_append_unwinder (gdbarch, &aix_sighandle_frame_unwind); |
1f82754b JB |
1193 | } |
1194 | ||
6c265988 | 1195 | void _initialize_rs6000_aix_tdep (); |
1f82754b | 1196 | void |
6c265988 | 1197 | _initialize_rs6000_aix_tdep () |
1f82754b JB |
1198 | { |
1199 | gdbarch_register_osabi_sniffer (bfd_arch_rs6000, | |
dda83cd7 SM |
1200 | bfd_target_xcoff_flavour, |
1201 | rs6000_aix_osabi_sniffer); | |
7a61a01c | 1202 | gdbarch_register_osabi_sniffer (bfd_arch_powerpc, |
dda83cd7 SM |
1203 | bfd_target_xcoff_flavour, |
1204 | rs6000_aix_osabi_sniffer); | |
1f82754b JB |
1205 | |
1206 | gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_AIX, | |
dda83cd7 | 1207 | rs6000_aix_init_osabi); |
7a61a01c | 1208 | gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_AIX, |
dda83cd7 | 1209 | rs6000_aix_init_osabi); |
1f82754b JB |
1210 | } |
1211 |