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dc18f110 AT |
1 | /* Target-dependent code for PowerPC systems running FreeBSD. |
2 | ||
3666a048 | 3 | Copyright (C) 2013-2021 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" | |
03b62bbb | 35 | #include "ppc-fbsd-tdep.h" |
23ea9aeb | 36 | #include "fbsd-tdep.h" |
dc18f110 | 37 | #include "solib-svr4.h" |
5b6d1e4f | 38 | #include "inferior.h" |
dc18f110 AT |
39 | |
40 | ||
41 | /* 32-bit regset descriptions. */ | |
42 | ||
43 | static const struct ppc_reg_offsets ppc32_fbsd_reg_offsets = | |
44 | { | |
45 | /* General-purpose registers. */ | |
46 | /* .r0_offset = */ 0, | |
47 | /* .gpr_size = */ 4, | |
48 | /* .xr_size = */ 4, | |
49 | /* .pc_offset = */ 144, | |
50 | /* .ps_offset = */ -1, | |
51 | /* .cr_offset = */ 132, | |
52 | /* .lr_offset = */ 128, | |
53 | /* .ctr_offset = */ 140, | |
54 | /* .xer_offset = */ 136, | |
55 | /* .mq_offset = */ -1, | |
56 | ||
57 | /* Floating-point registers. */ | |
58 | /* .f0_offset = */ 0, | |
59 | /* .fpscr_offset = */ 256, | |
1d75a658 | 60 | /* .fpscr_size = */ 8 |
dc18f110 AT |
61 | }; |
62 | ||
63 | /* 64-bit regset descriptions. */ | |
64 | ||
65 | static const struct ppc_reg_offsets ppc64_fbsd_reg_offsets = | |
66 | { | |
67 | /* General-purpose registers. */ | |
68 | /* .r0_offset = */ 0, | |
69 | /* .gpr_size = */ 8, | |
70 | /* .xr_size = */ 8, | |
71 | /* .pc_offset = */ 288, | |
72 | /* .ps_offset = */ -1, | |
73 | /* .cr_offset = */ 264, | |
74 | /* .lr_offset = */ 256, | |
75 | /* .ctr_offset = */ 280, | |
76 | /* .xer_offset = */ 272, | |
77 | /* .mq_offset = */ -1, | |
78 | ||
79 | /* Floating-point registers. */ | |
80 | /* .f0_offset = */ 0, | |
81 | /* .fpscr_offset = */ 256, | |
1d75a658 | 82 | /* .fpscr_size = */ 8 |
dc18f110 AT |
83 | }; |
84 | ||
85 | /* 32-bit general-purpose register set. */ | |
86 | ||
87 | static const struct regset ppc32_fbsd_gregset = { | |
88 | &ppc32_fbsd_reg_offsets, | |
89 | ppc_supply_gregset, | |
09424cff | 90 | ppc_collect_gregset |
dc18f110 AT |
91 | }; |
92 | ||
93 | /* 64-bit general-purpose register set. */ | |
94 | ||
95 | static const struct regset ppc64_fbsd_gregset = { | |
96 | &ppc64_fbsd_reg_offsets, | |
97 | ppc_supply_gregset, | |
09424cff | 98 | ppc_collect_gregset |
dc18f110 AT |
99 | }; |
100 | ||
101 | /* 32-/64-bit floating-point register set. */ | |
102 | ||
3ca7dae4 | 103 | static const struct regset ppc32_fbsd_fpregset = { |
dc18f110 AT |
104 | &ppc32_fbsd_reg_offsets, |
105 | ppc_supply_fpregset, | |
106 | ppc_collect_fpregset | |
107 | }; | |
108 | ||
109 | const struct regset * | |
110 | ppc_fbsd_gregset (int wordsize) | |
111 | { | |
112 | return wordsize == 8 ? &ppc64_fbsd_gregset : &ppc32_fbsd_gregset; | |
113 | } | |
114 | ||
115 | const struct regset * | |
116 | ppc_fbsd_fpregset (void) | |
117 | { | |
118 | return &ppc32_fbsd_fpregset; | |
119 | } | |
120 | ||
23ea9aeb | 121 | /* Iterate over core file register note sections. */ |
dc18f110 | 122 | |
23ea9aeb AA |
123 | static void |
124 | ppcfbsd_iterate_over_regset_sections (struct gdbarch *gdbarch, | |
125 | iterate_over_regset_sections_cb *cb, | |
126 | void *cb_data, | |
127 | const struct regcache *regcache) | |
dc18f110 AT |
128 | { |
129 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
23ea9aeb AA |
130 | |
131 | if (tdep->wordsize == 4) | |
a616bb94 | 132 | cb (".reg", 148, 148, &ppc32_fbsd_gregset, NULL, cb_data); |
23ea9aeb | 133 | else |
a616bb94 AH |
134 | cb (".reg", 296, 296, &ppc64_fbsd_gregset, NULL, cb_data); |
135 | cb (".reg2", 264, 264, &ppc32_fbsd_fpregset, NULL, cb_data); | |
dc18f110 AT |
136 | } |
137 | ||
138 | /* Default page size. */ | |
139 | ||
140 | static const int ppcfbsd_page_size = 4096; | |
141 | ||
142 | /* Offset for sigreturn(2). */ | |
143 | ||
144 | static const int ppcfbsd_sigreturn_offset[] = { | |
145 | 0xc, /* FreeBSD 32-bit */ | |
146 | -1 | |
147 | }; | |
148 | ||
149 | /* Signal trampolines. */ | |
150 | ||
151 | static int | |
152 | ppcfbsd_sigtramp_frame_sniffer (const struct frame_unwind *self, | |
153 | struct frame_info *this_frame, | |
154 | void **this_cache) | |
155 | { | |
156 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
157 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
158 | CORE_ADDR pc = get_frame_pc (this_frame); | |
159 | CORE_ADDR start_pc = (pc & ~(ppcfbsd_page_size - 1)); | |
160 | const int *offset; | |
161 | const char *name; | |
162 | ||
163 | /* A stack trampoline is detected if no name is associated | |
164 | to the current pc and if it points inside a trampoline | |
165 | sequence. */ | |
166 | ||
167 | find_pc_partial_function (pc, &name, NULL, NULL); | |
168 | ||
169 | /* If we have a name, we have no trampoline, return. */ | |
170 | if (name) | |
171 | return 0; | |
172 | ||
173 | for (offset = ppcfbsd_sigreturn_offset; *offset != -1; offset++) | |
174 | { | |
175 | gdb_byte buf[2 * PPC_INSN_SIZE]; | |
176 | unsigned long insn; | |
177 | ||
178 | if (!safe_frame_unwind_memory (this_frame, start_pc + *offset, | |
179 | buf, sizeof buf)) | |
180 | continue; | |
181 | ||
182 | /* Check for "li r0,SYS_sigreturn". */ | |
183 | insn = extract_unsigned_integer (buf, PPC_INSN_SIZE, byte_order); | |
184 | if (insn != 0x380001a1) | |
185 | continue; | |
186 | ||
187 | /* Check for "sc". */ | |
188 | insn = extract_unsigned_integer (buf + PPC_INSN_SIZE, | |
189 | PPC_INSN_SIZE, byte_order); | |
190 | if (insn != 0x44000002) | |
191 | continue; | |
192 | ||
193 | return 1; | |
194 | } | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static struct trad_frame_cache * | |
200 | ppcfbsd_sigtramp_frame_cache (struct frame_info *this_frame, void **this_cache) | |
201 | { | |
202 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
203 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
dc18f110 AT |
204 | struct trad_frame_cache *cache; |
205 | CORE_ADDR addr, base, func; | |
206 | gdb_byte buf[PPC_INSN_SIZE]; | |
207 | int i; | |
208 | ||
209 | if (*this_cache) | |
19ba03f4 | 210 | return (struct trad_frame_cache *) *this_cache; |
dc18f110 AT |
211 | |
212 | cache = trad_frame_cache_zalloc (this_frame); | |
213 | *this_cache = cache; | |
214 | ||
215 | func = get_frame_pc (this_frame); | |
216 | func &= ~(ppcfbsd_page_size - 1); | |
217 | if (!safe_frame_unwind_memory (this_frame, func, buf, sizeof buf)) | |
218 | return cache; | |
219 | ||
220 | base = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch)); | |
221 | addr = base + 0x10 + 2 * tdep->wordsize; | |
222 | for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize) | |
223 | { | |
224 | int regnum = i + tdep->ppc_gp0_regnum; | |
225 | trad_frame_set_reg_addr (cache, regnum, addr); | |
226 | } | |
227 | trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, addr); | |
228 | addr += tdep->wordsize; | |
229 | trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, addr); | |
230 | addr += tdep->wordsize; | |
231 | trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, addr); | |
232 | addr += tdep->wordsize; | |
233 | trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, addr); | |
234 | addr += tdep->wordsize; | |
235 | trad_frame_set_reg_addr (cache, gdbarch_pc_regnum (gdbarch), addr); | |
236 | /* SRR0? */ | |
237 | addr += tdep->wordsize; | |
238 | ||
239 | /* Construct the frame ID using the function start. */ | |
240 | trad_frame_set_id (cache, frame_id_build (base, func)); | |
241 | ||
242 | return cache; | |
243 | } | |
244 | ||
245 | static void | |
246 | ppcfbsd_sigtramp_frame_this_id (struct frame_info *this_frame, | |
247 | void **this_cache, struct frame_id *this_id) | |
248 | { | |
249 | struct trad_frame_cache *cache = | |
250 | ppcfbsd_sigtramp_frame_cache (this_frame, this_cache); | |
251 | ||
252 | trad_frame_get_id (cache, this_id); | |
253 | } | |
254 | ||
255 | static struct value * | |
256 | ppcfbsd_sigtramp_frame_prev_register (struct frame_info *this_frame, | |
257 | void **this_cache, int regnum) | |
258 | { | |
259 | struct trad_frame_cache *cache = | |
260 | ppcfbsd_sigtramp_frame_cache (this_frame, this_cache); | |
261 | ||
262 | return trad_frame_get_register (cache, this_frame, regnum); | |
263 | } | |
264 | ||
265 | static const struct frame_unwind ppcfbsd_sigtramp_frame_unwind = { | |
266 | SIGTRAMP_FRAME, | |
267 | default_frame_unwind_stop_reason, | |
268 | ppcfbsd_sigtramp_frame_this_id, | |
269 | ppcfbsd_sigtramp_frame_prev_register, | |
270 | NULL, | |
271 | ppcfbsd_sigtramp_frame_sniffer | |
272 | }; | |
273 | ||
274 | static enum return_value_convention | |
275 | ppcfbsd_return_value (struct gdbarch *gdbarch, struct value *function, | |
276 | struct type *valtype, struct regcache *regcache, | |
277 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
278 | { | |
279 | return ppc_sysv_abi_broken_return_value (gdbarch, function, valtype, | |
280 | regcache, readbuf, writebuf); | |
281 | } | |
282 | ||
8399425f JB |
283 | /* Implement the "get_thread_local_address" gdbarch method. */ |
284 | ||
285 | static CORE_ADDR | |
286 | ppcfbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid, | |
287 | CORE_ADDR lm_addr, CORE_ADDR offset) | |
288 | { | |
289 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
290 | struct regcache *regcache; | |
291 | int tp_offset, tp_regnum; | |
292 | ||
5b6d1e4f PA |
293 | regcache = get_thread_arch_regcache (current_inferior ()->process_target (), |
294 | ptid, gdbarch); | |
8399425f JB |
295 | |
296 | if (tdep->wordsize == 4) | |
297 | { | |
298 | tp_offset = 0x7008; | |
299 | tp_regnum = PPC_R0_REGNUM + 2; | |
300 | } | |
301 | else | |
302 | { | |
303 | tp_offset = 0x7010; | |
304 | tp_regnum = PPC_R0_REGNUM + 13; | |
305 | } | |
306 | target_fetch_registers (regcache, tp_regnum); | |
307 | ||
308 | ULONGEST tp; | |
309 | if (regcache->cooked_read (tp_regnum, &tp) != REG_VALID) | |
310 | error (_("Unable to fetch tcb pointer")); | |
311 | ||
312 | /* tp points to the end of the TCB block. The first member of the | |
313 | TCB is the pointer to the DTV array. */ | |
314 | CORE_ADDR dtv_addr = tp - tp_offset; | |
315 | return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset); | |
316 | } | |
dc18f110 AT |
317 | |
318 | static void | |
319 | ppcfbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
320 | { | |
321 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
322 | ||
23ea9aeb AA |
323 | /* Generic FreeBSD support. */ |
324 | fbsd_init_abi (info, gdbarch); | |
325 | ||
dc18f110 AT |
326 | /* FreeBSD doesn't support the 128-bit `long double' from the psABI. */ |
327 | set_gdbarch_long_double_bit (gdbarch, 64); | |
328 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); | |
329 | ||
330 | if (tdep->wordsize == 4) | |
331 | { | |
332 | set_gdbarch_return_value (gdbarch, ppcfbsd_return_value); | |
333 | ||
334 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); | |
335 | set_solib_svr4_fetch_link_map_offsets (gdbarch, | |
336 | svr4_ilp32_fetch_link_map_offsets); | |
337 | ||
338 | frame_unwind_append_unwinder (gdbarch, &ppcfbsd_sigtramp_frame_unwind); | |
339 | set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc"); | |
340 | } | |
341 | ||
342 | if (tdep->wordsize == 8) | |
343 | { | |
344 | set_gdbarch_convert_from_func_ptr_addr | |
345 | (gdbarch, ppc64_convert_from_func_ptr_addr); | |
24c274a1 AM |
346 | set_gdbarch_elf_make_msymbol_special (gdbarch, |
347 | ppc64_elf_make_msymbol_special); | |
348 | ||
dc18f110 AT |
349 | set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code); |
350 | set_solib_svr4_fetch_link_map_offsets (gdbarch, | |
351 | svr4_lp64_fetch_link_map_offsets); | |
352 | set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc"); | |
353 | } | |
354 | ||
23ea9aeb AA |
355 | set_gdbarch_iterate_over_regset_sections |
356 | (gdbarch, ppcfbsd_iterate_over_regset_sections); | |
dc18f110 AT |
357 | |
358 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
359 | svr4_fetch_objfile_link_map); | |
8399425f JB |
360 | set_gdbarch_get_thread_local_address (gdbarch, |
361 | ppcfbsd_get_thread_local_address); | |
dc18f110 AT |
362 | } |
363 | ||
6c265988 | 364 | void _initialize_ppcfbsd_tdep (); |
dc18f110 | 365 | void |
6c265988 | 366 | _initialize_ppcfbsd_tdep () |
dc18f110 | 367 | { |
1736a7bd | 368 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_FREEBSD, |
dc18f110 | 369 | ppcfbsd_init_abi); |
1736a7bd | 370 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64, GDB_OSABI_FREEBSD, |
dc18f110 | 371 | ppcfbsd_init_abi); |
1736a7bd | 372 | gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_FREEBSD, |
dc18f110 AT |
373 | ppcfbsd_init_abi); |
374 | } |