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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 | ||
33 | #include "gdb_assert.h" | |
0e9f083f | 34 | #include <string.h> |
dc18f110 AT |
35 | |
36 | #include "ppc-tdep.h" | |
37 | #include "ppc64-tdep.h" | |
38 | #include "ppcfbsd-tdep.h" | |
39 | #include "solib-svr4.h" | |
40 | ||
41 | ||
42 | /* 32-bit regset descriptions. */ | |
43 | ||
44 | static const struct ppc_reg_offsets ppc32_fbsd_reg_offsets = | |
45 | { | |
46 | /* General-purpose registers. */ | |
47 | /* .r0_offset = */ 0, | |
48 | /* .gpr_size = */ 4, | |
49 | /* .xr_size = */ 4, | |
50 | /* .pc_offset = */ 144, | |
51 | /* .ps_offset = */ -1, | |
52 | /* .cr_offset = */ 132, | |
53 | /* .lr_offset = */ 128, | |
54 | /* .ctr_offset = */ 140, | |
55 | /* .xer_offset = */ 136, | |
56 | /* .mq_offset = */ -1, | |
57 | ||
58 | /* Floating-point registers. */ | |
59 | /* .f0_offset = */ 0, | |
60 | /* .fpscr_offset = */ 256, | |
61 | /* .fpscr_size = */ 8, | |
62 | #ifdef NOTYET | |
63 | /* AltiVec registers. */ | |
64 | /* .vr0_offset = */ 0, | |
65 | /* .vscr_offset = */ 512 + 12, | |
66 | /* .vrsave_offset = */ 512 | |
67 | #endif | |
68 | }; | |
69 | ||
70 | /* 64-bit regset descriptions. */ | |
71 | ||
72 | static const struct ppc_reg_offsets ppc64_fbsd_reg_offsets = | |
73 | { | |
74 | /* General-purpose registers. */ | |
75 | /* .r0_offset = */ 0, | |
76 | /* .gpr_size = */ 8, | |
77 | /* .xr_size = */ 8, | |
78 | /* .pc_offset = */ 288, | |
79 | /* .ps_offset = */ -1, | |
80 | /* .cr_offset = */ 264, | |
81 | /* .lr_offset = */ 256, | |
82 | /* .ctr_offset = */ 280, | |
83 | /* .xer_offset = */ 272, | |
84 | /* .mq_offset = */ -1, | |
85 | ||
86 | /* Floating-point registers. */ | |
87 | /* .f0_offset = */ 0, | |
88 | /* .fpscr_offset = */ 256, | |
89 | /* .fpscr_size = */ 8, | |
90 | #ifdef NOYET | |
91 | /* AltiVec registers. */ | |
92 | /* .vr0_offset = */ 0, | |
93 | /* .vscr_offset = */ 512 + 12, | |
94 | /* .vrsave_offset = */ 528 | |
95 | #endif | |
96 | }; | |
97 | ||
98 | /* 32-bit general-purpose register set. */ | |
99 | ||
100 | static const struct regset ppc32_fbsd_gregset = { | |
101 | &ppc32_fbsd_reg_offsets, | |
102 | ppc_supply_gregset, | |
103 | ppc_collect_gregset, | |
104 | NULL | |
105 | }; | |
106 | ||
107 | /* 64-bit general-purpose register set. */ | |
108 | ||
109 | static const struct regset ppc64_fbsd_gregset = { | |
110 | &ppc64_fbsd_reg_offsets, | |
111 | ppc_supply_gregset, | |
112 | ppc_collect_gregset, | |
113 | NULL | |
114 | }; | |
115 | ||
116 | /* 32-/64-bit floating-point register set. */ | |
117 | ||
118 | static struct regset ppc32_fbsd_fpregset = { | |
119 | &ppc32_fbsd_reg_offsets, | |
120 | ppc_supply_fpregset, | |
121 | ppc_collect_fpregset | |
122 | }; | |
123 | ||
124 | const struct regset * | |
125 | ppc_fbsd_gregset (int wordsize) | |
126 | { | |
127 | return wordsize == 8 ? &ppc64_fbsd_gregset : &ppc32_fbsd_gregset; | |
128 | } | |
129 | ||
130 | const struct regset * | |
131 | ppc_fbsd_fpregset (void) | |
132 | { | |
133 | return &ppc32_fbsd_fpregset; | |
134 | } | |
135 | ||
136 | /* Return the appropriate register set for the core section identified | |
137 | by SECT_NAME and SECT_SIZE. */ | |
138 | ||
139 | static const struct regset * | |
140 | ppcfbsd_regset_from_core_section (struct gdbarch *gdbarch, | |
141 | const char *sect_name, size_t sect_size) | |
142 | { | |
143 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
144 | if (strcmp (sect_name, ".reg") == 0 && sect_size >= 148) | |
145 | { | |
146 | if (tdep->wordsize == 4) | |
147 | return &ppc32_fbsd_gregset; | |
148 | else | |
149 | return &ppc64_fbsd_gregset; | |
150 | } | |
151 | if (strcmp (sect_name, ".reg2") == 0 && sect_size >= 264) | |
152 | return &ppc32_fbsd_fpregset; | |
153 | return NULL; | |
154 | } | |
155 | ||
156 | /* Default page size. */ | |
157 | ||
158 | static const int ppcfbsd_page_size = 4096; | |
159 | ||
160 | /* Offset for sigreturn(2). */ | |
161 | ||
162 | static const int ppcfbsd_sigreturn_offset[] = { | |
163 | 0xc, /* FreeBSD 32-bit */ | |
164 | -1 | |
165 | }; | |
166 | ||
167 | /* Signal trampolines. */ | |
168 | ||
169 | static int | |
170 | ppcfbsd_sigtramp_frame_sniffer (const struct frame_unwind *self, | |
171 | struct frame_info *this_frame, | |
172 | void **this_cache) | |
173 | { | |
174 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
175 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
176 | CORE_ADDR pc = get_frame_pc (this_frame); | |
177 | CORE_ADDR start_pc = (pc & ~(ppcfbsd_page_size - 1)); | |
178 | const int *offset; | |
179 | const char *name; | |
180 | ||
181 | /* A stack trampoline is detected if no name is associated | |
182 | to the current pc and if it points inside a trampoline | |
183 | sequence. */ | |
184 | ||
185 | find_pc_partial_function (pc, &name, NULL, NULL); | |
186 | ||
187 | /* If we have a name, we have no trampoline, return. */ | |
188 | if (name) | |
189 | return 0; | |
190 | ||
191 | for (offset = ppcfbsd_sigreturn_offset; *offset != -1; offset++) | |
192 | { | |
193 | gdb_byte buf[2 * PPC_INSN_SIZE]; | |
194 | unsigned long insn; | |
195 | ||
196 | if (!safe_frame_unwind_memory (this_frame, start_pc + *offset, | |
197 | buf, sizeof buf)) | |
198 | continue; | |
199 | ||
200 | /* Check for "li r0,SYS_sigreturn". */ | |
201 | insn = extract_unsigned_integer (buf, PPC_INSN_SIZE, byte_order); | |
202 | if (insn != 0x380001a1) | |
203 | continue; | |
204 | ||
205 | /* Check for "sc". */ | |
206 | insn = extract_unsigned_integer (buf + PPC_INSN_SIZE, | |
207 | PPC_INSN_SIZE, byte_order); | |
208 | if (insn != 0x44000002) | |
209 | continue; | |
210 | ||
211 | return 1; | |
212 | } | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static struct trad_frame_cache * | |
218 | ppcfbsd_sigtramp_frame_cache (struct frame_info *this_frame, void **this_cache) | |
219 | { | |
220 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
221 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
222 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
223 | struct trad_frame_cache *cache; | |
224 | CORE_ADDR addr, base, func; | |
225 | gdb_byte buf[PPC_INSN_SIZE]; | |
226 | int i; | |
227 | ||
228 | if (*this_cache) | |
229 | return *this_cache; | |
230 | ||
231 | cache = trad_frame_cache_zalloc (this_frame); | |
232 | *this_cache = cache; | |
233 | ||
234 | func = get_frame_pc (this_frame); | |
235 | func &= ~(ppcfbsd_page_size - 1); | |
236 | if (!safe_frame_unwind_memory (this_frame, func, buf, sizeof buf)) | |
237 | return cache; | |
238 | ||
239 | base = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch)); | |
240 | addr = base + 0x10 + 2 * tdep->wordsize; | |
241 | for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize) | |
242 | { | |
243 | int regnum = i + tdep->ppc_gp0_regnum; | |
244 | trad_frame_set_reg_addr (cache, regnum, addr); | |
245 | } | |
246 | trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, addr); | |
247 | addr += tdep->wordsize; | |
248 | trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, addr); | |
249 | addr += tdep->wordsize; | |
250 | trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, addr); | |
251 | addr += tdep->wordsize; | |
252 | trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, addr); | |
253 | addr += tdep->wordsize; | |
254 | trad_frame_set_reg_addr (cache, gdbarch_pc_regnum (gdbarch), addr); | |
255 | /* SRR0? */ | |
256 | addr += tdep->wordsize; | |
257 | ||
258 | /* Construct the frame ID using the function start. */ | |
259 | trad_frame_set_id (cache, frame_id_build (base, func)); | |
260 | ||
261 | return cache; | |
262 | } | |
263 | ||
264 | static void | |
265 | ppcfbsd_sigtramp_frame_this_id (struct frame_info *this_frame, | |
266 | void **this_cache, struct frame_id *this_id) | |
267 | { | |
268 | struct trad_frame_cache *cache = | |
269 | ppcfbsd_sigtramp_frame_cache (this_frame, this_cache); | |
270 | ||
271 | trad_frame_get_id (cache, this_id); | |
272 | } | |
273 | ||
274 | static struct value * | |
275 | ppcfbsd_sigtramp_frame_prev_register (struct frame_info *this_frame, | |
276 | void **this_cache, int regnum) | |
277 | { | |
278 | struct trad_frame_cache *cache = | |
279 | ppcfbsd_sigtramp_frame_cache (this_frame, this_cache); | |
280 | ||
281 | return trad_frame_get_register (cache, this_frame, regnum); | |
282 | } | |
283 | ||
284 | static const struct frame_unwind ppcfbsd_sigtramp_frame_unwind = { | |
285 | SIGTRAMP_FRAME, | |
286 | default_frame_unwind_stop_reason, | |
287 | ppcfbsd_sigtramp_frame_this_id, | |
288 | ppcfbsd_sigtramp_frame_prev_register, | |
289 | NULL, | |
290 | ppcfbsd_sigtramp_frame_sniffer | |
291 | }; | |
292 | ||
293 | static enum return_value_convention | |
294 | ppcfbsd_return_value (struct gdbarch *gdbarch, struct value *function, | |
295 | struct type *valtype, struct regcache *regcache, | |
296 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
297 | { | |
298 | return ppc_sysv_abi_broken_return_value (gdbarch, function, valtype, | |
299 | regcache, readbuf, writebuf); | |
300 | } | |
301 | ||
302 | ||
303 | static void | |
304 | ppcfbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
305 | { | |
306 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
307 | ||
308 | /* FreeBSD doesn't support the 128-bit `long double' from the psABI. */ | |
309 | set_gdbarch_long_double_bit (gdbarch, 64); | |
310 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); | |
311 | ||
312 | if (tdep->wordsize == 4) | |
313 | { | |
314 | set_gdbarch_return_value (gdbarch, ppcfbsd_return_value); | |
315 | ||
316 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); | |
317 | set_solib_svr4_fetch_link_map_offsets (gdbarch, | |
318 | svr4_ilp32_fetch_link_map_offsets); | |
319 | ||
320 | frame_unwind_append_unwinder (gdbarch, &ppcfbsd_sigtramp_frame_unwind); | |
321 | set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc"); | |
322 | } | |
323 | ||
324 | if (tdep->wordsize == 8) | |
325 | { | |
326 | set_gdbarch_convert_from_func_ptr_addr | |
327 | (gdbarch, ppc64_convert_from_func_ptr_addr); | |
24c274a1 AM |
328 | set_gdbarch_elf_make_msymbol_special (gdbarch, |
329 | ppc64_elf_make_msymbol_special); | |
330 | ||
dc18f110 AT |
331 | set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code); |
332 | set_solib_svr4_fetch_link_map_offsets (gdbarch, | |
333 | svr4_lp64_fetch_link_map_offsets); | |
334 | set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc"); | |
335 | } | |
336 | ||
337 | set_gdbarch_regset_from_core_section | |
338 | (gdbarch, ppcfbsd_regset_from_core_section); | |
339 | ||
340 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
341 | svr4_fetch_objfile_link_map); | |
342 | } | |
343 | ||
344 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
345 | ||
346 | void _initialize_ppcfbsd_tdep (void); | |
347 | ||
348 | void | |
349 | _initialize_ppcfbsd_tdep (void) | |
350 | { | |
351 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_FREEBSD_ELF, | |
352 | ppcfbsd_init_abi); | |
353 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64, | |
354 | GDB_OSABI_FREEBSD_ELF, | |
355 | ppcfbsd_init_abi); | |
356 | gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_FREEBSD_ELF, | |
357 | ppcfbsd_init_abi); | |
358 | } |