Commit | Line | Data |
---|---|---|
dc18f110 AT |
1 | /* Target-dependent code for PowerPC systems running FreeBSD. |
2 | ||
ecd75fc8 | 3 | Copyright (C) 2013-2014 Free Software Foundation, Inc. |
dc18f110 AT |
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 3 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, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "arch-utils.h" | |
22 | #include "frame.h" | |
23 | #include "gdbcore.h" | |
24 | #include "frame-unwind.h" | |
25 | #include "gdbtypes.h" | |
26 | #include "osabi.h" | |
27 | #include "regcache.h" | |
28 | #include "regset.h" | |
29 | #include "symtab.h" | |
30 | #include "target.h" | |
31 | #include "trad-frame.h" | |
32 | ||
dc18f110 AT |
33 | #include "ppc-tdep.h" |
34 | #include "ppc64-tdep.h" | |
35 | #include "ppcfbsd-tdep.h" | |
36 | #include "solib-svr4.h" | |
37 | ||
38 | ||
39 | /* 32-bit regset descriptions. */ | |
40 | ||
41 | static const struct ppc_reg_offsets ppc32_fbsd_reg_offsets = | |
42 | { | |
43 | /* General-purpose registers. */ | |
44 | /* .r0_offset = */ 0, | |
45 | /* .gpr_size = */ 4, | |
46 | /* .xr_size = */ 4, | |
47 | /* .pc_offset = */ 144, | |
48 | /* .ps_offset = */ -1, | |
49 | /* .cr_offset = */ 132, | |
50 | /* .lr_offset = */ 128, | |
51 | /* .ctr_offset = */ 140, | |
52 | /* .xer_offset = */ 136, | |
53 | /* .mq_offset = */ -1, | |
54 | ||
55 | /* Floating-point registers. */ | |
56 | /* .f0_offset = */ 0, | |
57 | /* .fpscr_offset = */ 256, | |
58 | /* .fpscr_size = */ 8, | |
59 | #ifdef NOTYET | |
60 | /* AltiVec registers. */ | |
61 | /* .vr0_offset = */ 0, | |
62 | /* .vscr_offset = */ 512 + 12, | |
63 | /* .vrsave_offset = */ 512 | |
64 | #endif | |
65 | }; | |
66 | ||
67 | /* 64-bit regset descriptions. */ | |
68 | ||
69 | static const struct ppc_reg_offsets ppc64_fbsd_reg_offsets = | |
70 | { | |
71 | /* General-purpose registers. */ | |
72 | /* .r0_offset = */ 0, | |
73 | /* .gpr_size = */ 8, | |
74 | /* .xr_size = */ 8, | |
75 | /* .pc_offset = */ 288, | |
76 | /* .ps_offset = */ -1, | |
77 | /* .cr_offset = */ 264, | |
78 | /* .lr_offset = */ 256, | |
79 | /* .ctr_offset = */ 280, | |
80 | /* .xer_offset = */ 272, | |
81 | /* .mq_offset = */ -1, | |
82 | ||
83 | /* Floating-point registers. */ | |
84 | /* .f0_offset = */ 0, | |
85 | /* .fpscr_offset = */ 256, | |
86 | /* .fpscr_size = */ 8, | |
87 | #ifdef NOYET | |
88 | /* AltiVec registers. */ | |
89 | /* .vr0_offset = */ 0, | |
90 | /* .vscr_offset = */ 512 + 12, | |
91 | /* .vrsave_offset = */ 528 | |
92 | #endif | |
93 | }; | |
94 | ||
95 | /* 32-bit general-purpose register set. */ | |
96 | ||
97 | static const struct regset ppc32_fbsd_gregset = { | |
98 | &ppc32_fbsd_reg_offsets, | |
99 | ppc_supply_gregset, | |
09424cff | 100 | ppc_collect_gregset |
dc18f110 AT |
101 | }; |
102 | ||
103 | /* 64-bit general-purpose register set. */ | |
104 | ||
105 | static const struct regset ppc64_fbsd_gregset = { | |
106 | &ppc64_fbsd_reg_offsets, | |
107 | ppc_supply_gregset, | |
09424cff | 108 | ppc_collect_gregset |
dc18f110 AT |
109 | }; |
110 | ||
111 | /* 32-/64-bit floating-point register set. */ | |
112 | ||
3ca7dae4 | 113 | static const struct regset ppc32_fbsd_fpregset = { |
dc18f110 AT |
114 | &ppc32_fbsd_reg_offsets, |
115 | ppc_supply_fpregset, | |
116 | ppc_collect_fpregset | |
117 | }; | |
118 | ||
119 | const struct regset * | |
120 | ppc_fbsd_gregset (int wordsize) | |
121 | { | |
122 | return wordsize == 8 ? &ppc64_fbsd_gregset : &ppc32_fbsd_gregset; | |
123 | } | |
124 | ||
125 | const struct regset * | |
126 | ppc_fbsd_fpregset (void) | |
127 | { | |
128 | return &ppc32_fbsd_fpregset; | |
129 | } | |
130 | ||
131 | /* Return the appropriate register set for the core section identified | |
132 | by SECT_NAME and SECT_SIZE. */ | |
133 | ||
134 | static const struct regset * | |
135 | ppcfbsd_regset_from_core_section (struct gdbarch *gdbarch, | |
136 | const char *sect_name, size_t sect_size) | |
137 | { | |
138 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
139 | if (strcmp (sect_name, ".reg") == 0 && sect_size >= 148) | |
140 | { | |
141 | if (tdep->wordsize == 4) | |
142 | return &ppc32_fbsd_gregset; | |
143 | else | |
144 | return &ppc64_fbsd_gregset; | |
145 | } | |
146 | if (strcmp (sect_name, ".reg2") == 0 && sect_size >= 264) | |
147 | return &ppc32_fbsd_fpregset; | |
148 | return NULL; | |
149 | } | |
150 | ||
151 | /* Default page size. */ | |
152 | ||
153 | static const int ppcfbsd_page_size = 4096; | |
154 | ||
155 | /* Offset for sigreturn(2). */ | |
156 | ||
157 | static const int ppcfbsd_sigreturn_offset[] = { | |
158 | 0xc, /* FreeBSD 32-bit */ | |
159 | -1 | |
160 | }; | |
161 | ||
162 | /* Signal trampolines. */ | |
163 | ||
164 | static int | |
165 | ppcfbsd_sigtramp_frame_sniffer (const struct frame_unwind *self, | |
166 | struct frame_info *this_frame, | |
167 | void **this_cache) | |
168 | { | |
169 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
170 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
171 | CORE_ADDR pc = get_frame_pc (this_frame); | |
172 | CORE_ADDR start_pc = (pc & ~(ppcfbsd_page_size - 1)); | |
173 | const int *offset; | |
174 | const char *name; | |
175 | ||
176 | /* A stack trampoline is detected if no name is associated | |
177 | to the current pc and if it points inside a trampoline | |
178 | sequence. */ | |
179 | ||
180 | find_pc_partial_function (pc, &name, NULL, NULL); | |
181 | ||
182 | /* If we have a name, we have no trampoline, return. */ | |
183 | if (name) | |
184 | return 0; | |
185 | ||
186 | for (offset = ppcfbsd_sigreturn_offset; *offset != -1; offset++) | |
187 | { | |
188 | gdb_byte buf[2 * PPC_INSN_SIZE]; | |
189 | unsigned long insn; | |
190 | ||
191 | if (!safe_frame_unwind_memory (this_frame, start_pc + *offset, | |
192 | buf, sizeof buf)) | |
193 | continue; | |
194 | ||
195 | /* Check for "li r0,SYS_sigreturn". */ | |
196 | insn = extract_unsigned_integer (buf, PPC_INSN_SIZE, byte_order); | |
197 | if (insn != 0x380001a1) | |
198 | continue; | |
199 | ||
200 | /* Check for "sc". */ | |
201 | insn = extract_unsigned_integer (buf + PPC_INSN_SIZE, | |
202 | PPC_INSN_SIZE, byte_order); | |
203 | if (insn != 0x44000002) | |
204 | continue; | |
205 | ||
206 | return 1; | |
207 | } | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static struct trad_frame_cache * | |
213 | ppcfbsd_sigtramp_frame_cache (struct frame_info *this_frame, void **this_cache) | |
214 | { | |
215 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
216 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
217 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
218 | struct trad_frame_cache *cache; | |
219 | CORE_ADDR addr, base, func; | |
220 | gdb_byte buf[PPC_INSN_SIZE]; | |
221 | int i; | |
222 | ||
223 | if (*this_cache) | |
224 | return *this_cache; | |
225 | ||
226 | cache = trad_frame_cache_zalloc (this_frame); | |
227 | *this_cache = cache; | |
228 | ||
229 | func = get_frame_pc (this_frame); | |
230 | func &= ~(ppcfbsd_page_size - 1); | |
231 | if (!safe_frame_unwind_memory (this_frame, func, buf, sizeof buf)) | |
232 | return cache; | |
233 | ||
234 | base = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch)); | |
235 | addr = base + 0x10 + 2 * tdep->wordsize; | |
236 | for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize) | |
237 | { | |
238 | int regnum = i + tdep->ppc_gp0_regnum; | |
239 | trad_frame_set_reg_addr (cache, regnum, addr); | |
240 | } | |
241 | trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, addr); | |
242 | addr += tdep->wordsize; | |
243 | trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, addr); | |
244 | addr += tdep->wordsize; | |
245 | trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, addr); | |
246 | addr += tdep->wordsize; | |
247 | trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, addr); | |
248 | addr += tdep->wordsize; | |
249 | trad_frame_set_reg_addr (cache, gdbarch_pc_regnum (gdbarch), addr); | |
250 | /* SRR0? */ | |
251 | addr += tdep->wordsize; | |
252 | ||
253 | /* Construct the frame ID using the function start. */ | |
254 | trad_frame_set_id (cache, frame_id_build (base, func)); | |
255 | ||
256 | return cache; | |
257 | } | |
258 | ||
259 | static void | |
260 | ppcfbsd_sigtramp_frame_this_id (struct frame_info *this_frame, | |
261 | void **this_cache, struct frame_id *this_id) | |
262 | { | |
263 | struct trad_frame_cache *cache = | |
264 | ppcfbsd_sigtramp_frame_cache (this_frame, this_cache); | |
265 | ||
266 | trad_frame_get_id (cache, this_id); | |
267 | } | |
268 | ||
269 | static struct value * | |
270 | ppcfbsd_sigtramp_frame_prev_register (struct frame_info *this_frame, | |
271 | void **this_cache, int regnum) | |
272 | { | |
273 | struct trad_frame_cache *cache = | |
274 | ppcfbsd_sigtramp_frame_cache (this_frame, this_cache); | |
275 | ||
276 | return trad_frame_get_register (cache, this_frame, regnum); | |
277 | } | |
278 | ||
279 | static const struct frame_unwind ppcfbsd_sigtramp_frame_unwind = { | |
280 | SIGTRAMP_FRAME, | |
281 | default_frame_unwind_stop_reason, | |
282 | ppcfbsd_sigtramp_frame_this_id, | |
283 | ppcfbsd_sigtramp_frame_prev_register, | |
284 | NULL, | |
285 | ppcfbsd_sigtramp_frame_sniffer | |
286 | }; | |
287 | ||
288 | static enum return_value_convention | |
289 | ppcfbsd_return_value (struct gdbarch *gdbarch, struct value *function, | |
290 | struct type *valtype, struct regcache *regcache, | |
291 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
292 | { | |
293 | return ppc_sysv_abi_broken_return_value (gdbarch, function, valtype, | |
294 | regcache, readbuf, writebuf); | |
295 | } | |
296 | ||
297 | ||
298 | static void | |
299 | ppcfbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
300 | { | |
301 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
302 | ||
303 | /* FreeBSD doesn't support the 128-bit `long double' from the psABI. */ | |
304 | set_gdbarch_long_double_bit (gdbarch, 64); | |
305 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); | |
306 | ||
307 | if (tdep->wordsize == 4) | |
308 | { | |
309 | set_gdbarch_return_value (gdbarch, ppcfbsd_return_value); | |
310 | ||
311 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); | |
312 | set_solib_svr4_fetch_link_map_offsets (gdbarch, | |
313 | svr4_ilp32_fetch_link_map_offsets); | |
314 | ||
315 | frame_unwind_append_unwinder (gdbarch, &ppcfbsd_sigtramp_frame_unwind); | |
316 | set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc"); | |
317 | } | |
318 | ||
319 | if (tdep->wordsize == 8) | |
320 | { | |
321 | set_gdbarch_convert_from_func_ptr_addr | |
322 | (gdbarch, ppc64_convert_from_func_ptr_addr); | |
24c274a1 AM |
323 | set_gdbarch_elf_make_msymbol_special (gdbarch, |
324 | ppc64_elf_make_msymbol_special); | |
325 | ||
dc18f110 AT |
326 | set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code); |
327 | set_solib_svr4_fetch_link_map_offsets (gdbarch, | |
328 | svr4_lp64_fetch_link_map_offsets); | |
329 | set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc"); | |
330 | } | |
331 | ||
332 | set_gdbarch_regset_from_core_section | |
333 | (gdbarch, ppcfbsd_regset_from_core_section); | |
334 | ||
335 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
336 | svr4_fetch_objfile_link_map); | |
337 | } | |
338 | ||
339 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
340 | ||
341 | void _initialize_ppcfbsd_tdep (void); | |
342 | ||
343 | void | |
344 | _initialize_ppcfbsd_tdep (void) | |
345 | { | |
346 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_FREEBSD_ELF, | |
347 | ppcfbsd_init_abi); | |
348 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64, | |
349 | GDB_OSABI_FREEBSD_ELF, | |
350 | ppcfbsd_init_abi); | |
351 | gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_FREEBSD_ELF, | |
352 | ppcfbsd_init_abi); | |
353 | } |