| 1 | /* Target-dependent code for PowerPC systems running FreeBSD. |
| 2 | |
| 3 | Copyright (C) 2013-2016 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 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 "ppc-tdep.h" |
| 34 | #include "ppc64-tdep.h" |
| 35 | #include "ppcfbsd-tdep.h" |
| 36 | #include "fbsd-tdep.h" |
| 37 | #include "solib-svr4.h" |
| 38 | |
| 39 | |
| 40 | /* 32-bit regset descriptions. */ |
| 41 | |
| 42 | static const struct ppc_reg_offsets ppc32_fbsd_reg_offsets = |
| 43 | { |
| 44 | /* General-purpose registers. */ |
| 45 | /* .r0_offset = */ 0, |
| 46 | /* .gpr_size = */ 4, |
| 47 | /* .xr_size = */ 4, |
| 48 | /* .pc_offset = */ 144, |
| 49 | /* .ps_offset = */ -1, |
| 50 | /* .cr_offset = */ 132, |
| 51 | /* .lr_offset = */ 128, |
| 52 | /* .ctr_offset = */ 140, |
| 53 | /* .xer_offset = */ 136, |
| 54 | /* .mq_offset = */ -1, |
| 55 | |
| 56 | /* Floating-point registers. */ |
| 57 | /* .f0_offset = */ 0, |
| 58 | /* .fpscr_offset = */ 256, |
| 59 | /* .fpscr_size = */ 8, |
| 60 | #ifdef NOTYET |
| 61 | /* AltiVec registers. */ |
| 62 | /* .vr0_offset = */ 0, |
| 63 | /* .vscr_offset = */ 512 + 12, |
| 64 | /* .vrsave_offset = */ 512 |
| 65 | #endif |
| 66 | }; |
| 67 | |
| 68 | /* 64-bit regset descriptions. */ |
| 69 | |
| 70 | static const struct ppc_reg_offsets ppc64_fbsd_reg_offsets = |
| 71 | { |
| 72 | /* General-purpose registers. */ |
| 73 | /* .r0_offset = */ 0, |
| 74 | /* .gpr_size = */ 8, |
| 75 | /* .xr_size = */ 8, |
| 76 | /* .pc_offset = */ 288, |
| 77 | /* .ps_offset = */ -1, |
| 78 | /* .cr_offset = */ 264, |
| 79 | /* .lr_offset = */ 256, |
| 80 | /* .ctr_offset = */ 280, |
| 81 | /* .xer_offset = */ 272, |
| 82 | /* .mq_offset = */ -1, |
| 83 | |
| 84 | /* Floating-point registers. */ |
| 85 | /* .f0_offset = */ 0, |
| 86 | /* .fpscr_offset = */ 256, |
| 87 | /* .fpscr_size = */ 8, |
| 88 | #ifdef NOYET |
| 89 | /* AltiVec registers. */ |
| 90 | /* .vr0_offset = */ 0, |
| 91 | /* .vscr_offset = */ 512 + 12, |
| 92 | /* .vrsave_offset = */ 528 |
| 93 | #endif |
| 94 | }; |
| 95 | |
| 96 | /* 32-bit general-purpose register set. */ |
| 97 | |
| 98 | static const struct regset ppc32_fbsd_gregset = { |
| 99 | &ppc32_fbsd_reg_offsets, |
| 100 | ppc_supply_gregset, |
| 101 | ppc_collect_gregset |
| 102 | }; |
| 103 | |
| 104 | /* 64-bit general-purpose register set. */ |
| 105 | |
| 106 | static const struct regset ppc64_fbsd_gregset = { |
| 107 | &ppc64_fbsd_reg_offsets, |
| 108 | ppc_supply_gregset, |
| 109 | ppc_collect_gregset |
| 110 | }; |
| 111 | |
| 112 | /* 32-/64-bit floating-point register set. */ |
| 113 | |
| 114 | static const struct regset ppc32_fbsd_fpregset = { |
| 115 | &ppc32_fbsd_reg_offsets, |
| 116 | ppc_supply_fpregset, |
| 117 | ppc_collect_fpregset |
| 118 | }; |
| 119 | |
| 120 | const struct regset * |
| 121 | ppc_fbsd_gregset (int wordsize) |
| 122 | { |
| 123 | return wordsize == 8 ? &ppc64_fbsd_gregset : &ppc32_fbsd_gregset; |
| 124 | } |
| 125 | |
| 126 | const struct regset * |
| 127 | ppc_fbsd_fpregset (void) |
| 128 | { |
| 129 | return &ppc32_fbsd_fpregset; |
| 130 | } |
| 131 | |
| 132 | /* Iterate over core file register note sections. */ |
| 133 | |
| 134 | static void |
| 135 | ppcfbsd_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| 136 | iterate_over_regset_sections_cb *cb, |
| 137 | void *cb_data, |
| 138 | const struct regcache *regcache) |
| 139 | { |
| 140 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 141 | |
| 142 | if (tdep->wordsize == 4) |
| 143 | cb (".reg", 148, &ppc32_fbsd_gregset, NULL, cb_data); |
| 144 | else |
| 145 | cb (".reg", 296, &ppc64_fbsd_gregset, NULL, cb_data); |
| 146 | cb (".reg2", 264, &ppc32_fbsd_fpregset, NULL, cb_data); |
| 147 | } |
| 148 | |
| 149 | /* Default page size. */ |
| 150 | |
| 151 | static const int ppcfbsd_page_size = 4096; |
| 152 | |
| 153 | /* Offset for sigreturn(2). */ |
| 154 | |
| 155 | static const int ppcfbsd_sigreturn_offset[] = { |
| 156 | 0xc, /* FreeBSD 32-bit */ |
| 157 | -1 |
| 158 | }; |
| 159 | |
| 160 | /* Signal trampolines. */ |
| 161 | |
| 162 | static int |
| 163 | ppcfbsd_sigtramp_frame_sniffer (const struct frame_unwind *self, |
| 164 | struct frame_info *this_frame, |
| 165 | void **this_cache) |
| 166 | { |
| 167 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 168 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 169 | CORE_ADDR pc = get_frame_pc (this_frame); |
| 170 | CORE_ADDR start_pc = (pc & ~(ppcfbsd_page_size - 1)); |
| 171 | const int *offset; |
| 172 | const char *name; |
| 173 | |
| 174 | /* A stack trampoline is detected if no name is associated |
| 175 | to the current pc and if it points inside a trampoline |
| 176 | sequence. */ |
| 177 | |
| 178 | find_pc_partial_function (pc, &name, NULL, NULL); |
| 179 | |
| 180 | /* If we have a name, we have no trampoline, return. */ |
| 181 | if (name) |
| 182 | return 0; |
| 183 | |
| 184 | for (offset = ppcfbsd_sigreturn_offset; *offset != -1; offset++) |
| 185 | { |
| 186 | gdb_byte buf[2 * PPC_INSN_SIZE]; |
| 187 | unsigned long insn; |
| 188 | |
| 189 | if (!safe_frame_unwind_memory (this_frame, start_pc + *offset, |
| 190 | buf, sizeof buf)) |
| 191 | continue; |
| 192 | |
| 193 | /* Check for "li r0,SYS_sigreturn". */ |
| 194 | insn = extract_unsigned_integer (buf, PPC_INSN_SIZE, byte_order); |
| 195 | if (insn != 0x380001a1) |
| 196 | continue; |
| 197 | |
| 198 | /* Check for "sc". */ |
| 199 | insn = extract_unsigned_integer (buf + PPC_INSN_SIZE, |
| 200 | PPC_INSN_SIZE, byte_order); |
| 201 | if (insn != 0x44000002) |
| 202 | continue; |
| 203 | |
| 204 | return 1; |
| 205 | } |
| 206 | |
| 207 | return 0; |
| 208 | } |
| 209 | |
| 210 | static struct trad_frame_cache * |
| 211 | ppcfbsd_sigtramp_frame_cache (struct frame_info *this_frame, void **this_cache) |
| 212 | { |
| 213 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 214 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 215 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 216 | struct trad_frame_cache *cache; |
| 217 | CORE_ADDR addr, base, func; |
| 218 | gdb_byte buf[PPC_INSN_SIZE]; |
| 219 | int i; |
| 220 | |
| 221 | if (*this_cache) |
| 222 | return (struct trad_frame_cache *) *this_cache; |
| 223 | |
| 224 | cache = trad_frame_cache_zalloc (this_frame); |
| 225 | *this_cache = cache; |
| 226 | |
| 227 | func = get_frame_pc (this_frame); |
| 228 | func &= ~(ppcfbsd_page_size - 1); |
| 229 | if (!safe_frame_unwind_memory (this_frame, func, buf, sizeof buf)) |
| 230 | return cache; |
| 231 | |
| 232 | base = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch)); |
| 233 | addr = base + 0x10 + 2 * tdep->wordsize; |
| 234 | for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize) |
| 235 | { |
| 236 | int regnum = i + tdep->ppc_gp0_regnum; |
| 237 | trad_frame_set_reg_addr (cache, regnum, addr); |
| 238 | } |
| 239 | trad_frame_set_reg_addr (cache, tdep->ppc_lr_regnum, addr); |
| 240 | addr += tdep->wordsize; |
| 241 | trad_frame_set_reg_addr (cache, tdep->ppc_cr_regnum, addr); |
| 242 | addr += tdep->wordsize; |
| 243 | trad_frame_set_reg_addr (cache, tdep->ppc_xer_regnum, addr); |
| 244 | addr += tdep->wordsize; |
| 245 | trad_frame_set_reg_addr (cache, tdep->ppc_ctr_regnum, addr); |
| 246 | addr += tdep->wordsize; |
| 247 | trad_frame_set_reg_addr (cache, gdbarch_pc_regnum (gdbarch), addr); |
| 248 | /* SRR0? */ |
| 249 | addr += tdep->wordsize; |
| 250 | |
| 251 | /* Construct the frame ID using the function start. */ |
| 252 | trad_frame_set_id (cache, frame_id_build (base, func)); |
| 253 | |
| 254 | return cache; |
| 255 | } |
| 256 | |
| 257 | static void |
| 258 | ppcfbsd_sigtramp_frame_this_id (struct frame_info *this_frame, |
| 259 | void **this_cache, struct frame_id *this_id) |
| 260 | { |
| 261 | struct trad_frame_cache *cache = |
| 262 | ppcfbsd_sigtramp_frame_cache (this_frame, this_cache); |
| 263 | |
| 264 | trad_frame_get_id (cache, this_id); |
| 265 | } |
| 266 | |
| 267 | static struct value * |
| 268 | ppcfbsd_sigtramp_frame_prev_register (struct frame_info *this_frame, |
| 269 | void **this_cache, int regnum) |
| 270 | { |
| 271 | struct trad_frame_cache *cache = |
| 272 | ppcfbsd_sigtramp_frame_cache (this_frame, this_cache); |
| 273 | |
| 274 | return trad_frame_get_register (cache, this_frame, regnum); |
| 275 | } |
| 276 | |
| 277 | static const struct frame_unwind ppcfbsd_sigtramp_frame_unwind = { |
| 278 | SIGTRAMP_FRAME, |
| 279 | default_frame_unwind_stop_reason, |
| 280 | ppcfbsd_sigtramp_frame_this_id, |
| 281 | ppcfbsd_sigtramp_frame_prev_register, |
| 282 | NULL, |
| 283 | ppcfbsd_sigtramp_frame_sniffer |
| 284 | }; |
| 285 | |
| 286 | static enum return_value_convention |
| 287 | ppcfbsd_return_value (struct gdbarch *gdbarch, struct value *function, |
| 288 | struct type *valtype, struct regcache *regcache, |
| 289 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 290 | { |
| 291 | return ppc_sysv_abi_broken_return_value (gdbarch, function, valtype, |
| 292 | regcache, readbuf, writebuf); |
| 293 | } |
| 294 | |
| 295 | |
| 296 | static void |
| 297 | ppcfbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 298 | { |
| 299 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 300 | |
| 301 | /* Generic FreeBSD support. */ |
| 302 | fbsd_init_abi (info, gdbarch); |
| 303 | |
| 304 | /* FreeBSD doesn't support the 128-bit `long double' from the psABI. */ |
| 305 | set_gdbarch_long_double_bit (gdbarch, 64); |
| 306 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); |
| 307 | |
| 308 | if (tdep->wordsize == 4) |
| 309 | { |
| 310 | set_gdbarch_return_value (gdbarch, ppcfbsd_return_value); |
| 311 | |
| 312 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
| 313 | set_solib_svr4_fetch_link_map_offsets (gdbarch, |
| 314 | svr4_ilp32_fetch_link_map_offsets); |
| 315 | |
| 316 | frame_unwind_append_unwinder (gdbarch, &ppcfbsd_sigtramp_frame_unwind); |
| 317 | set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc"); |
| 318 | } |
| 319 | |
| 320 | if (tdep->wordsize == 8) |
| 321 | { |
| 322 | set_gdbarch_convert_from_func_ptr_addr |
| 323 | (gdbarch, ppc64_convert_from_func_ptr_addr); |
| 324 | set_gdbarch_elf_make_msymbol_special (gdbarch, |
| 325 | ppc64_elf_make_msymbol_special); |
| 326 | |
| 327 | set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code); |
| 328 | set_solib_svr4_fetch_link_map_offsets (gdbarch, |
| 329 | svr4_lp64_fetch_link_map_offsets); |
| 330 | set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc"); |
| 331 | } |
| 332 | |
| 333 | set_gdbarch_iterate_over_regset_sections |
| 334 | (gdbarch, ppcfbsd_iterate_over_regset_sections); |
| 335 | |
| 336 | set_gdbarch_fetch_tls_load_module_address (gdbarch, |
| 337 | svr4_fetch_objfile_link_map); |
| 338 | } |
| 339 | |
| 340 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 341 | |
| 342 | void _initialize_ppcfbsd_tdep (void); |
| 343 | |
| 344 | void |
| 345 | _initialize_ppcfbsd_tdep (void) |
| 346 | { |
| 347 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_FREEBSD_ELF, |
| 348 | ppcfbsd_init_abi); |
| 349 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64, |
| 350 | GDB_OSABI_FREEBSD_ELF, |
| 351 | ppcfbsd_init_abi); |
| 352 | gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_FREEBSD_ELF, |
| 353 | ppcfbsd_init_abi); |
| 354 | } |