| 1 | /* Target-dependent code for GNU/Linux on MIPS processors. |
| 2 | |
| 3 | Copyright (C) 2001-2002, 2004-2012 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 "gdbcore.h" |
| 22 | #include "target.h" |
| 23 | #include "solib-svr4.h" |
| 24 | #include "osabi.h" |
| 25 | #include "mips-tdep.h" |
| 26 | #include "gdb_string.h" |
| 27 | #include "gdb_assert.h" |
| 28 | #include "frame.h" |
| 29 | #include "regcache.h" |
| 30 | #include "trad-frame.h" |
| 31 | #include "tramp-frame.h" |
| 32 | #include "gdbtypes.h" |
| 33 | #include "solib.h" |
| 34 | #include "solib-svr4.h" |
| 35 | #include "solist.h" |
| 36 | #include "symtab.h" |
| 37 | #include "target-descriptions.h" |
| 38 | #include "regset.h" |
| 39 | #include "mips-linux-tdep.h" |
| 40 | #include "glibc-tdep.h" |
| 41 | #include "linux-tdep.h" |
| 42 | #include "xml-syscall.h" |
| 43 | |
| 44 | static struct target_so_ops mips_svr4_so_ops; |
| 45 | |
| 46 | /* Figure out where the longjmp will land. |
| 47 | We expect the first arg to be a pointer to the jmp_buf structure |
| 48 | from which we extract the pc (MIPS_LINUX_JB_PC) that we will land |
| 49 | at. The pc is copied into PC. This routine returns 1 on |
| 50 | success. */ |
| 51 | |
| 52 | #define MIPS_LINUX_JB_ELEMENT_SIZE 4 |
| 53 | #define MIPS_LINUX_JB_PC 0 |
| 54 | |
| 55 | static int |
| 56 | mips_linux_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
| 57 | { |
| 58 | CORE_ADDR jb_addr; |
| 59 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 60 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 61 | char buf[gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT]; |
| 62 | |
| 63 | jb_addr = get_frame_register_unsigned (frame, MIPS_A0_REGNUM); |
| 64 | |
| 65 | if (target_read_memory (jb_addr |
| 66 | + MIPS_LINUX_JB_PC * MIPS_LINUX_JB_ELEMENT_SIZE, |
| 67 | buf, gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT)) |
| 68 | return 0; |
| 69 | |
| 70 | *pc = extract_unsigned_integer (buf, |
| 71 | gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT, |
| 72 | byte_order); |
| 73 | |
| 74 | return 1; |
| 75 | } |
| 76 | |
| 77 | /* Transform the bits comprising a 32-bit register to the right size |
| 78 | for regcache_raw_supply(). This is needed when mips_isa_regsize() |
| 79 | is 8. */ |
| 80 | |
| 81 | static void |
| 82 | supply_32bit_reg (struct regcache *regcache, int regnum, const void *addr) |
| 83 | { |
| 84 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 85 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 86 | gdb_byte buf[MAX_REGISTER_SIZE]; |
| 87 | store_signed_integer (buf, register_size (gdbarch, regnum), byte_order, |
| 88 | extract_signed_integer (addr, 4, byte_order)); |
| 89 | regcache_raw_supply (regcache, regnum, buf); |
| 90 | } |
| 91 | |
| 92 | /* Unpack an elf_gregset_t into GDB's register cache. */ |
| 93 | |
| 94 | void |
| 95 | mips_supply_gregset (struct regcache *regcache, |
| 96 | const mips_elf_gregset_t *gregsetp) |
| 97 | { |
| 98 | int regi; |
| 99 | const mips_elf_greg_t *regp = *gregsetp; |
| 100 | char zerobuf[MAX_REGISTER_SIZE]; |
| 101 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 102 | |
| 103 | memset (zerobuf, 0, MAX_REGISTER_SIZE); |
| 104 | |
| 105 | for (regi = EF_REG0 + 1; regi <= EF_REG31; regi++) |
| 106 | supply_32bit_reg (regcache, regi - EF_REG0, regp + regi); |
| 107 | |
| 108 | if (mips_linux_restart_reg_p (gdbarch)) |
| 109 | supply_32bit_reg (regcache, MIPS_RESTART_REGNUM, regp + EF_REG0); |
| 110 | |
| 111 | supply_32bit_reg (regcache, mips_regnum (gdbarch)->lo, regp + EF_LO); |
| 112 | supply_32bit_reg (regcache, mips_regnum (gdbarch)->hi, regp + EF_HI); |
| 113 | |
| 114 | supply_32bit_reg (regcache, mips_regnum (gdbarch)->pc, |
| 115 | regp + EF_CP0_EPC); |
| 116 | supply_32bit_reg (regcache, mips_regnum (gdbarch)->badvaddr, |
| 117 | regp + EF_CP0_BADVADDR); |
| 118 | supply_32bit_reg (regcache, MIPS_PS_REGNUM, regp + EF_CP0_STATUS); |
| 119 | supply_32bit_reg (regcache, mips_regnum (gdbarch)->cause, |
| 120 | regp + EF_CP0_CAUSE); |
| 121 | |
| 122 | /* Fill the inaccessible zero register with zero. */ |
| 123 | regcache_raw_supply (regcache, MIPS_ZERO_REGNUM, zerobuf); |
| 124 | } |
| 125 | |
| 126 | static void |
| 127 | mips_supply_gregset_wrapper (const struct regset *regset, |
| 128 | struct regcache *regcache, |
| 129 | int regnum, const void *gregs, size_t len) |
| 130 | { |
| 131 | gdb_assert (len == sizeof (mips_elf_gregset_t)); |
| 132 | |
| 133 | mips_supply_gregset (regcache, (const mips_elf_gregset_t *)gregs); |
| 134 | } |
| 135 | |
| 136 | /* Pack our registers (or one register) into an elf_gregset_t. */ |
| 137 | |
| 138 | void |
| 139 | mips_fill_gregset (const struct regcache *regcache, |
| 140 | mips_elf_gregset_t *gregsetp, int regno) |
| 141 | { |
| 142 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 143 | int regaddr, regi; |
| 144 | mips_elf_greg_t *regp = *gregsetp; |
| 145 | void *dst; |
| 146 | |
| 147 | if (regno == -1) |
| 148 | { |
| 149 | memset (regp, 0, sizeof (mips_elf_gregset_t)); |
| 150 | for (regi = 1; regi < 32; regi++) |
| 151 | mips_fill_gregset (regcache, gregsetp, regi); |
| 152 | mips_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->lo); |
| 153 | mips_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->hi); |
| 154 | mips_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->pc); |
| 155 | mips_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->badvaddr); |
| 156 | mips_fill_gregset (regcache, gregsetp, MIPS_PS_REGNUM); |
| 157 | mips_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->cause); |
| 158 | mips_fill_gregset (regcache, gregsetp, MIPS_RESTART_REGNUM); |
| 159 | return; |
| 160 | } |
| 161 | |
| 162 | if (regno > 0 && regno < 32) |
| 163 | { |
| 164 | dst = regp + regno + EF_REG0; |
| 165 | regcache_raw_collect (regcache, regno, dst); |
| 166 | return; |
| 167 | } |
| 168 | |
| 169 | if (regno == mips_regnum (gdbarch)->lo) |
| 170 | regaddr = EF_LO; |
| 171 | else if (regno == mips_regnum (gdbarch)->hi) |
| 172 | regaddr = EF_HI; |
| 173 | else if (regno == mips_regnum (gdbarch)->pc) |
| 174 | regaddr = EF_CP0_EPC; |
| 175 | else if (regno == mips_regnum (gdbarch)->badvaddr) |
| 176 | regaddr = EF_CP0_BADVADDR; |
| 177 | else if (regno == MIPS_PS_REGNUM) |
| 178 | regaddr = EF_CP0_STATUS; |
| 179 | else if (regno == mips_regnum (gdbarch)->cause) |
| 180 | regaddr = EF_CP0_CAUSE; |
| 181 | else if (mips_linux_restart_reg_p (gdbarch) |
| 182 | && regno == MIPS_RESTART_REGNUM) |
| 183 | regaddr = EF_REG0; |
| 184 | else |
| 185 | regaddr = -1; |
| 186 | |
| 187 | if (regaddr != -1) |
| 188 | { |
| 189 | dst = regp + regaddr; |
| 190 | regcache_raw_collect (regcache, regno, dst); |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | static void |
| 195 | mips_fill_gregset_wrapper (const struct regset *regset, |
| 196 | const struct regcache *regcache, |
| 197 | int regnum, void *gregs, size_t len) |
| 198 | { |
| 199 | gdb_assert (len == sizeof (mips_elf_gregset_t)); |
| 200 | |
| 201 | mips_fill_gregset (regcache, (mips_elf_gregset_t *)gregs, regnum); |
| 202 | } |
| 203 | |
| 204 | /* Likewise, unpack an elf_fpregset_t. */ |
| 205 | |
| 206 | void |
| 207 | mips_supply_fpregset (struct regcache *regcache, |
| 208 | const mips_elf_fpregset_t *fpregsetp) |
| 209 | { |
| 210 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 211 | int regi; |
| 212 | char zerobuf[MAX_REGISTER_SIZE]; |
| 213 | |
| 214 | memset (zerobuf, 0, MAX_REGISTER_SIZE); |
| 215 | |
| 216 | for (regi = 0; regi < 32; regi++) |
| 217 | regcache_raw_supply (regcache, |
| 218 | gdbarch_fp0_regnum (gdbarch) + regi, |
| 219 | *fpregsetp + regi); |
| 220 | |
| 221 | regcache_raw_supply (regcache, |
| 222 | mips_regnum (gdbarch)->fp_control_status, |
| 223 | *fpregsetp + 32); |
| 224 | |
| 225 | /* FIXME: how can we supply FCRIR? The ABI doesn't tell us. */ |
| 226 | regcache_raw_supply (regcache, |
| 227 | mips_regnum (gdbarch)->fp_implementation_revision, |
| 228 | zerobuf); |
| 229 | } |
| 230 | |
| 231 | static void |
| 232 | mips_supply_fpregset_wrapper (const struct regset *regset, |
| 233 | struct regcache *regcache, |
| 234 | int regnum, const void *gregs, size_t len) |
| 235 | { |
| 236 | gdb_assert (len == sizeof (mips_elf_fpregset_t)); |
| 237 | |
| 238 | mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *)gregs); |
| 239 | } |
| 240 | |
| 241 | /* Likewise, pack one or all floating point registers into an |
| 242 | elf_fpregset_t. */ |
| 243 | |
| 244 | void |
| 245 | mips_fill_fpregset (const struct regcache *regcache, |
| 246 | mips_elf_fpregset_t *fpregsetp, int regno) |
| 247 | { |
| 248 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 249 | char *from, *to; |
| 250 | |
| 251 | if ((regno >= gdbarch_fp0_regnum (gdbarch)) |
| 252 | && (regno < gdbarch_fp0_regnum (gdbarch) + 32)) |
| 253 | { |
| 254 | to = (char *) (*fpregsetp + regno - gdbarch_fp0_regnum (gdbarch)); |
| 255 | regcache_raw_collect (regcache, regno, to); |
| 256 | } |
| 257 | else if (regno == mips_regnum (gdbarch)->fp_control_status) |
| 258 | { |
| 259 | to = (char *) (*fpregsetp + 32); |
| 260 | regcache_raw_collect (regcache, regno, to); |
| 261 | } |
| 262 | else if (regno == -1) |
| 263 | { |
| 264 | int regi; |
| 265 | |
| 266 | for (regi = 0; regi < 32; regi++) |
| 267 | mips_fill_fpregset (regcache, fpregsetp, |
| 268 | gdbarch_fp0_regnum (gdbarch) + regi); |
| 269 | mips_fill_fpregset (regcache, fpregsetp, |
| 270 | mips_regnum (gdbarch)->fp_control_status); |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | static void |
| 275 | mips_fill_fpregset_wrapper (const struct regset *regset, |
| 276 | const struct regcache *regcache, |
| 277 | int regnum, void *gregs, size_t len) |
| 278 | { |
| 279 | gdb_assert (len == sizeof (mips_elf_fpregset_t)); |
| 280 | |
| 281 | mips_fill_fpregset (regcache, (mips_elf_fpregset_t *)gregs, regnum); |
| 282 | } |
| 283 | |
| 284 | /* Support for 64-bit ABIs. */ |
| 285 | |
| 286 | /* Figure out where the longjmp will land. |
| 287 | We expect the first arg to be a pointer to the jmp_buf structure |
| 288 | from which we extract the pc (MIPS_LINUX_JB_PC) that we will land |
| 289 | at. The pc is copied into PC. This routine returns 1 on |
| 290 | success. */ |
| 291 | |
| 292 | /* Details about jmp_buf. */ |
| 293 | |
| 294 | #define MIPS64_LINUX_JB_PC 0 |
| 295 | |
| 296 | static int |
| 297 | mips64_linux_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
| 298 | { |
| 299 | CORE_ADDR jb_addr; |
| 300 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 301 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 302 | void *buf = alloca (gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT); |
| 303 | int element_size = gdbarch_ptr_bit (gdbarch) == 32 ? 4 : 8; |
| 304 | |
| 305 | jb_addr = get_frame_register_unsigned (frame, MIPS_A0_REGNUM); |
| 306 | |
| 307 | if (target_read_memory (jb_addr + MIPS64_LINUX_JB_PC * element_size, |
| 308 | buf, |
| 309 | gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT)) |
| 310 | return 0; |
| 311 | |
| 312 | *pc = extract_unsigned_integer (buf, |
| 313 | gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT, |
| 314 | byte_order); |
| 315 | |
| 316 | return 1; |
| 317 | } |
| 318 | |
| 319 | /* Register set support functions. These operate on standard 64-bit |
| 320 | regsets, but work whether the target is 32-bit or 64-bit. A 32-bit |
| 321 | target will still use the 64-bit format for PTRACE_GETREGS. */ |
| 322 | |
| 323 | /* Supply a 64-bit register. */ |
| 324 | |
| 325 | static void |
| 326 | supply_64bit_reg (struct regcache *regcache, int regnum, |
| 327 | const gdb_byte *buf) |
| 328 | { |
| 329 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 330 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG |
| 331 | && register_size (gdbarch, regnum) == 4) |
| 332 | regcache_raw_supply (regcache, regnum, buf + 4); |
| 333 | else |
| 334 | regcache_raw_supply (regcache, regnum, buf); |
| 335 | } |
| 336 | |
| 337 | /* Unpack a 64-bit elf_gregset_t into GDB's register cache. */ |
| 338 | |
| 339 | void |
| 340 | mips64_supply_gregset (struct regcache *regcache, |
| 341 | const mips64_elf_gregset_t *gregsetp) |
| 342 | { |
| 343 | int regi; |
| 344 | const mips64_elf_greg_t *regp = *gregsetp; |
| 345 | gdb_byte zerobuf[MAX_REGISTER_SIZE]; |
| 346 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 347 | |
| 348 | memset (zerobuf, 0, MAX_REGISTER_SIZE); |
| 349 | |
| 350 | for (regi = MIPS64_EF_REG0 + 1; regi <= MIPS64_EF_REG31; regi++) |
| 351 | supply_64bit_reg (regcache, regi - MIPS64_EF_REG0, |
| 352 | (const gdb_byte *)(regp + regi)); |
| 353 | |
| 354 | if (mips_linux_restart_reg_p (gdbarch)) |
| 355 | supply_64bit_reg (regcache, MIPS_RESTART_REGNUM, |
| 356 | (const gdb_byte *)(regp + MIPS64_EF_REG0)); |
| 357 | |
| 358 | supply_64bit_reg (regcache, mips_regnum (gdbarch)->lo, |
| 359 | (const gdb_byte *) (regp + MIPS64_EF_LO)); |
| 360 | supply_64bit_reg (regcache, mips_regnum (gdbarch)->hi, |
| 361 | (const gdb_byte *) (regp + MIPS64_EF_HI)); |
| 362 | |
| 363 | supply_64bit_reg (regcache, mips_regnum (gdbarch)->pc, |
| 364 | (const gdb_byte *) (regp + MIPS64_EF_CP0_EPC)); |
| 365 | supply_64bit_reg (regcache, mips_regnum (gdbarch)->badvaddr, |
| 366 | (const gdb_byte *) (regp + MIPS64_EF_CP0_BADVADDR)); |
| 367 | supply_64bit_reg (regcache, MIPS_PS_REGNUM, |
| 368 | (const gdb_byte *) (regp + MIPS64_EF_CP0_STATUS)); |
| 369 | supply_64bit_reg (regcache, mips_regnum (gdbarch)->cause, |
| 370 | (const gdb_byte *) (regp + MIPS64_EF_CP0_CAUSE)); |
| 371 | |
| 372 | /* Fill the inaccessible zero register with zero. */ |
| 373 | regcache_raw_supply (regcache, MIPS_ZERO_REGNUM, zerobuf); |
| 374 | } |
| 375 | |
| 376 | static void |
| 377 | mips64_supply_gregset_wrapper (const struct regset *regset, |
| 378 | struct regcache *regcache, |
| 379 | int regnum, const void *gregs, size_t len) |
| 380 | { |
| 381 | gdb_assert (len == sizeof (mips64_elf_gregset_t)); |
| 382 | |
| 383 | mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *)gregs); |
| 384 | } |
| 385 | |
| 386 | /* Pack our registers (or one register) into a 64-bit elf_gregset_t. */ |
| 387 | |
| 388 | void |
| 389 | mips64_fill_gregset (const struct regcache *regcache, |
| 390 | mips64_elf_gregset_t *gregsetp, int regno) |
| 391 | { |
| 392 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 393 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 394 | int regaddr, regi; |
| 395 | mips64_elf_greg_t *regp = *gregsetp; |
| 396 | void *dst; |
| 397 | |
| 398 | if (regno == -1) |
| 399 | { |
| 400 | memset (regp, 0, sizeof (mips64_elf_gregset_t)); |
| 401 | for (regi = 1; regi < 32; regi++) |
| 402 | mips64_fill_gregset (regcache, gregsetp, regi); |
| 403 | mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->lo); |
| 404 | mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->hi); |
| 405 | mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->pc); |
| 406 | mips64_fill_gregset (regcache, gregsetp, |
| 407 | mips_regnum (gdbarch)->badvaddr); |
| 408 | mips64_fill_gregset (regcache, gregsetp, MIPS_PS_REGNUM); |
| 409 | mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->cause); |
| 410 | mips64_fill_gregset (regcache, gregsetp, MIPS_RESTART_REGNUM); |
| 411 | return; |
| 412 | } |
| 413 | |
| 414 | if (regno > 0 && regno < 32) |
| 415 | regaddr = regno + MIPS64_EF_REG0; |
| 416 | else if (regno == mips_regnum (gdbarch)->lo) |
| 417 | regaddr = MIPS64_EF_LO; |
| 418 | else if (regno == mips_regnum (gdbarch)->hi) |
| 419 | regaddr = MIPS64_EF_HI; |
| 420 | else if (regno == mips_regnum (gdbarch)->pc) |
| 421 | regaddr = MIPS64_EF_CP0_EPC; |
| 422 | else if (regno == mips_regnum (gdbarch)->badvaddr) |
| 423 | regaddr = MIPS64_EF_CP0_BADVADDR; |
| 424 | else if (regno == MIPS_PS_REGNUM) |
| 425 | regaddr = MIPS64_EF_CP0_STATUS; |
| 426 | else if (regno == mips_regnum (gdbarch)->cause) |
| 427 | regaddr = MIPS64_EF_CP0_CAUSE; |
| 428 | else if (mips_linux_restart_reg_p (gdbarch) |
| 429 | && regno == MIPS_RESTART_REGNUM) |
| 430 | regaddr = MIPS64_EF_REG0; |
| 431 | else |
| 432 | regaddr = -1; |
| 433 | |
| 434 | if (regaddr != -1) |
| 435 | { |
| 436 | gdb_byte buf[MAX_REGISTER_SIZE]; |
| 437 | LONGEST val; |
| 438 | |
| 439 | regcache_raw_collect (regcache, regno, buf); |
| 440 | val = extract_signed_integer (buf, register_size (gdbarch, regno), |
| 441 | byte_order); |
| 442 | dst = regp + regaddr; |
| 443 | store_signed_integer (dst, 8, byte_order, val); |
| 444 | } |
| 445 | } |
| 446 | |
| 447 | static void |
| 448 | mips64_fill_gregset_wrapper (const struct regset *regset, |
| 449 | const struct regcache *regcache, |
| 450 | int regnum, void *gregs, size_t len) |
| 451 | { |
| 452 | gdb_assert (len == sizeof (mips64_elf_gregset_t)); |
| 453 | |
| 454 | mips64_fill_gregset (regcache, (mips64_elf_gregset_t *)gregs, regnum); |
| 455 | } |
| 456 | |
| 457 | /* Likewise, unpack an elf_fpregset_t. */ |
| 458 | |
| 459 | void |
| 460 | mips64_supply_fpregset (struct regcache *regcache, |
| 461 | const mips64_elf_fpregset_t *fpregsetp) |
| 462 | { |
| 463 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 464 | int regi; |
| 465 | |
| 466 | /* See mips_linux_o32_sigframe_init for a description of the |
| 467 | peculiar FP register layout. */ |
| 468 | if (register_size (gdbarch, gdbarch_fp0_regnum (gdbarch)) == 4) |
| 469 | for (regi = 0; regi < 32; regi++) |
| 470 | { |
| 471 | const gdb_byte *reg_ptr = (const gdb_byte *)(*fpregsetp + (regi & ~1)); |
| 472 | if ((gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) != (regi & 1)) |
| 473 | reg_ptr += 4; |
| 474 | regcache_raw_supply (regcache, |
| 475 | gdbarch_fp0_regnum (gdbarch) + regi, |
| 476 | reg_ptr); |
| 477 | } |
| 478 | else |
| 479 | for (regi = 0; regi < 32; regi++) |
| 480 | regcache_raw_supply (regcache, |
| 481 | gdbarch_fp0_regnum (gdbarch) + regi, |
| 482 | (const char *)(*fpregsetp + regi)); |
| 483 | |
| 484 | supply_32bit_reg (regcache, mips_regnum (gdbarch)->fp_control_status, |
| 485 | (const gdb_byte *)(*fpregsetp + 32)); |
| 486 | |
| 487 | /* The ABI doesn't tell us how to supply FCRIR, and core dumps don't |
| 488 | include it - but the result of PTRACE_GETFPREGS does. The best we |
| 489 | can do is to assume that its value is present. */ |
| 490 | supply_32bit_reg (regcache, |
| 491 | mips_regnum (gdbarch)->fp_implementation_revision, |
| 492 | (const gdb_byte *)(*fpregsetp + 32) + 4); |
| 493 | } |
| 494 | |
| 495 | static void |
| 496 | mips64_supply_fpregset_wrapper (const struct regset *regset, |
| 497 | struct regcache *regcache, |
| 498 | int regnum, const void *gregs, size_t len) |
| 499 | { |
| 500 | gdb_assert (len == sizeof (mips64_elf_fpregset_t)); |
| 501 | |
| 502 | mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *)gregs); |
| 503 | } |
| 504 | |
| 505 | /* Likewise, pack one or all floating point registers into an |
| 506 | elf_fpregset_t. */ |
| 507 | |
| 508 | void |
| 509 | mips64_fill_fpregset (const struct regcache *regcache, |
| 510 | mips64_elf_fpregset_t *fpregsetp, int regno) |
| 511 | { |
| 512 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 513 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 514 | gdb_byte *to; |
| 515 | |
| 516 | if ((regno >= gdbarch_fp0_regnum (gdbarch)) |
| 517 | && (regno < gdbarch_fp0_regnum (gdbarch) + 32)) |
| 518 | { |
| 519 | /* See mips_linux_o32_sigframe_init for a description of the |
| 520 | peculiar FP register layout. */ |
| 521 | if (register_size (gdbarch, regno) == 4) |
| 522 | { |
| 523 | int regi = regno - gdbarch_fp0_regnum (gdbarch); |
| 524 | |
| 525 | to = (gdb_byte *) (*fpregsetp + (regi & ~1)); |
| 526 | if ((gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) != (regi & 1)) |
| 527 | to += 4; |
| 528 | regcache_raw_collect (regcache, regno, to); |
| 529 | } |
| 530 | else |
| 531 | { |
| 532 | to = (gdb_byte *) (*fpregsetp + regno |
| 533 | - gdbarch_fp0_regnum (gdbarch)); |
| 534 | regcache_raw_collect (regcache, regno, to); |
| 535 | } |
| 536 | } |
| 537 | else if (regno == mips_regnum (gdbarch)->fp_control_status) |
| 538 | { |
| 539 | gdb_byte buf[MAX_REGISTER_SIZE]; |
| 540 | LONGEST val; |
| 541 | |
| 542 | regcache_raw_collect (regcache, regno, buf); |
| 543 | val = extract_signed_integer (buf, register_size (gdbarch, regno), |
| 544 | byte_order); |
| 545 | to = (gdb_byte *) (*fpregsetp + 32); |
| 546 | store_signed_integer (to, 4, byte_order, val); |
| 547 | } |
| 548 | else if (regno == mips_regnum (gdbarch)->fp_implementation_revision) |
| 549 | { |
| 550 | gdb_byte buf[MAX_REGISTER_SIZE]; |
| 551 | LONGEST val; |
| 552 | |
| 553 | regcache_raw_collect (regcache, regno, buf); |
| 554 | val = extract_signed_integer (buf, register_size (gdbarch, regno), |
| 555 | byte_order); |
| 556 | to = (gdb_byte *) (*fpregsetp + 32) + 4; |
| 557 | store_signed_integer (to, 4, byte_order, val); |
| 558 | } |
| 559 | else if (regno == -1) |
| 560 | { |
| 561 | int regi; |
| 562 | |
| 563 | for (regi = 0; regi < 32; regi++) |
| 564 | mips64_fill_fpregset (regcache, fpregsetp, |
| 565 | gdbarch_fp0_regnum (gdbarch) + regi); |
| 566 | mips64_fill_fpregset (regcache, fpregsetp, |
| 567 | mips_regnum (gdbarch)->fp_control_status); |
| 568 | mips64_fill_fpregset (regcache, fpregsetp, |
| 569 | (mips_regnum (gdbarch) |
| 570 | ->fp_implementation_revision)); |
| 571 | } |
| 572 | } |
| 573 | |
| 574 | static void |
| 575 | mips64_fill_fpregset_wrapper (const struct regset *regset, |
| 576 | const struct regcache *regcache, |
| 577 | int regnum, void *gregs, size_t len) |
| 578 | { |
| 579 | gdb_assert (len == sizeof (mips64_elf_fpregset_t)); |
| 580 | |
| 581 | mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *)gregs, regnum); |
| 582 | } |
| 583 | |
| 584 | static const struct regset * |
| 585 | mips_linux_regset_from_core_section (struct gdbarch *gdbarch, |
| 586 | const char *sect_name, size_t sect_size) |
| 587 | { |
| 588 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 589 | mips_elf_gregset_t gregset; |
| 590 | mips_elf_fpregset_t fpregset; |
| 591 | mips64_elf_gregset_t gregset64; |
| 592 | mips64_elf_fpregset_t fpregset64; |
| 593 | |
| 594 | if (strcmp (sect_name, ".reg") == 0) |
| 595 | { |
| 596 | if (sect_size == sizeof (gregset)) |
| 597 | { |
| 598 | if (tdep->gregset == NULL) |
| 599 | tdep->gregset = regset_alloc (gdbarch, |
| 600 | mips_supply_gregset_wrapper, |
| 601 | mips_fill_gregset_wrapper); |
| 602 | return tdep->gregset; |
| 603 | } |
| 604 | else if (sect_size == sizeof (gregset64)) |
| 605 | { |
| 606 | if (tdep->gregset64 == NULL) |
| 607 | tdep->gregset64 = regset_alloc (gdbarch, |
| 608 | mips64_supply_gregset_wrapper, |
| 609 | mips64_fill_gregset_wrapper); |
| 610 | return tdep->gregset64; |
| 611 | } |
| 612 | else |
| 613 | { |
| 614 | warning (_("wrong size gregset struct in core file")); |
| 615 | } |
| 616 | } |
| 617 | else if (strcmp (sect_name, ".reg2") == 0) |
| 618 | { |
| 619 | if (sect_size == sizeof (fpregset)) |
| 620 | { |
| 621 | if (tdep->fpregset == NULL) |
| 622 | tdep->fpregset = regset_alloc (gdbarch, |
| 623 | mips_supply_fpregset_wrapper, |
| 624 | mips_fill_fpregset_wrapper); |
| 625 | return tdep->fpregset; |
| 626 | } |
| 627 | else if (sect_size == sizeof (fpregset64)) |
| 628 | { |
| 629 | if (tdep->fpregset64 == NULL) |
| 630 | tdep->fpregset64 = regset_alloc (gdbarch, |
| 631 | mips64_supply_fpregset_wrapper, |
| 632 | mips64_fill_fpregset_wrapper); |
| 633 | return tdep->fpregset64; |
| 634 | } |
| 635 | else |
| 636 | { |
| 637 | warning (_("wrong size fpregset struct in core file")); |
| 638 | } |
| 639 | } |
| 640 | |
| 641 | return NULL; |
| 642 | } |
| 643 | |
| 644 | static const struct target_desc * |
| 645 | mips_linux_core_read_description (struct gdbarch *gdbarch, |
| 646 | struct target_ops *target, |
| 647 | bfd *abfd) |
| 648 | { |
| 649 | asection *section = bfd_get_section_by_name (abfd, ".reg"); |
| 650 | if (! section) |
| 651 | return NULL; |
| 652 | |
| 653 | switch (bfd_section_size (abfd, section)) |
| 654 | { |
| 655 | case sizeof (mips_elf_gregset_t): |
| 656 | return mips_tdesc_gp32; |
| 657 | |
| 658 | case sizeof (mips64_elf_gregset_t): |
| 659 | return mips_tdesc_gp64; |
| 660 | |
| 661 | default: |
| 662 | return NULL; |
| 663 | } |
| 664 | } |
| 665 | |
| 666 | |
| 667 | /* Check the code at PC for a dynamic linker lazy resolution stub. |
| 668 | Because they aren't in the .plt section, we pattern-match on the |
| 669 | code generated by GNU ld. They look like this: |
| 670 | |
| 671 | lw t9,0x8010(gp) |
| 672 | addu t7,ra |
| 673 | jalr t9,ra |
| 674 | addiu t8,zero,INDEX |
| 675 | |
| 676 | (with the appropriate doubleword instructions for N64). Also |
| 677 | return the dynamic symbol index used in the last instruction. */ |
| 678 | |
| 679 | static int |
| 680 | mips_linux_in_dynsym_stub (CORE_ADDR pc, char *name) |
| 681 | { |
| 682 | unsigned char buf[28], *p; |
| 683 | ULONGEST insn, insn1; |
| 684 | int n64 = (mips_abi (target_gdbarch) == MIPS_ABI_N64); |
| 685 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); |
| 686 | |
| 687 | read_memory (pc - 12, buf, 28); |
| 688 | |
| 689 | if (n64) |
| 690 | { |
| 691 | /* ld t9,0x8010(gp) */ |
| 692 | insn1 = 0xdf998010; |
| 693 | } |
| 694 | else |
| 695 | { |
| 696 | /* lw t9,0x8010(gp) */ |
| 697 | insn1 = 0x8f998010; |
| 698 | } |
| 699 | |
| 700 | p = buf + 12; |
| 701 | while (p >= buf) |
| 702 | { |
| 703 | insn = extract_unsigned_integer (p, 4, byte_order); |
| 704 | if (insn == insn1) |
| 705 | break; |
| 706 | p -= 4; |
| 707 | } |
| 708 | if (p < buf) |
| 709 | return 0; |
| 710 | |
| 711 | insn = extract_unsigned_integer (p + 4, 4, byte_order); |
| 712 | if (n64) |
| 713 | { |
| 714 | /* daddu t7,ra */ |
| 715 | if (insn != 0x03e0782d) |
| 716 | return 0; |
| 717 | } |
| 718 | else |
| 719 | { |
| 720 | /* addu t7,ra */ |
| 721 | if (insn != 0x03e07821) |
| 722 | return 0; |
| 723 | } |
| 724 | |
| 725 | insn = extract_unsigned_integer (p + 8, 4, byte_order); |
| 726 | /* jalr t9,ra */ |
| 727 | if (insn != 0x0320f809) |
| 728 | return 0; |
| 729 | |
| 730 | insn = extract_unsigned_integer (p + 12, 4, byte_order); |
| 731 | if (n64) |
| 732 | { |
| 733 | /* daddiu t8,zero,0 */ |
| 734 | if ((insn & 0xffff0000) != 0x64180000) |
| 735 | return 0; |
| 736 | } |
| 737 | else |
| 738 | { |
| 739 | /* addiu t8,zero,0 */ |
| 740 | if ((insn & 0xffff0000) != 0x24180000) |
| 741 | return 0; |
| 742 | } |
| 743 | |
| 744 | return (insn & 0xffff); |
| 745 | } |
| 746 | |
| 747 | /* Return non-zero iff PC belongs to the dynamic linker resolution |
| 748 | code, a PLT entry, or a lazy binding stub. */ |
| 749 | |
| 750 | static int |
| 751 | mips_linux_in_dynsym_resolve_code (CORE_ADDR pc) |
| 752 | { |
| 753 | /* Check whether PC is in the dynamic linker. This also checks |
| 754 | whether it is in the .plt section, used by non-PIC executables. */ |
| 755 | if (svr4_in_dynsym_resolve_code (pc)) |
| 756 | return 1; |
| 757 | |
| 758 | /* Pattern match for the stub. It would be nice if there were a |
| 759 | more efficient way to avoid this check. */ |
| 760 | if (mips_linux_in_dynsym_stub (pc, NULL)) |
| 761 | return 1; |
| 762 | |
| 763 | return 0; |
| 764 | } |
| 765 | |
| 766 | /* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c, |
| 767 | and glibc_skip_solib_resolver in glibc-tdep.c. The normal glibc |
| 768 | implementation of this triggers at "fixup" from the same objfile as |
| 769 | "_dl_runtime_resolve"; MIPS GNU/Linux can trigger at |
| 770 | "__dl_runtime_resolve" directly. An unresolved lazy binding |
| 771 | stub will point to _dl_runtime_resolve, which will first call |
| 772 | __dl_runtime_resolve, and then pass control to the resolved |
| 773 | function. */ |
| 774 | |
| 775 | static CORE_ADDR |
| 776 | mips_linux_skip_resolver (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 777 | { |
| 778 | struct minimal_symbol *resolver; |
| 779 | |
| 780 | resolver = lookup_minimal_symbol ("__dl_runtime_resolve", NULL, NULL); |
| 781 | |
| 782 | if (resolver && SYMBOL_VALUE_ADDRESS (resolver) == pc) |
| 783 | return frame_unwind_caller_pc (get_current_frame ()); |
| 784 | |
| 785 | return glibc_skip_solib_resolver (gdbarch, pc); |
| 786 | } |
| 787 | |
| 788 | /* Signal trampoline support. There are four supported layouts for a |
| 789 | signal frame: o32 sigframe, o32 rt_sigframe, n32 rt_sigframe, and |
| 790 | n64 rt_sigframe. We handle them all independently; not the most |
| 791 | efficient way, but simplest. First, declare all the unwinders. */ |
| 792 | |
| 793 | static void mips_linux_o32_sigframe_init (const struct tramp_frame *self, |
| 794 | struct frame_info *this_frame, |
| 795 | struct trad_frame_cache *this_cache, |
| 796 | CORE_ADDR func); |
| 797 | |
| 798 | static void mips_linux_n32n64_sigframe_init (const struct tramp_frame *self, |
| 799 | struct frame_info *this_frame, |
| 800 | struct trad_frame_cache *this_cache, |
| 801 | CORE_ADDR func); |
| 802 | |
| 803 | #define MIPS_NR_LINUX 4000 |
| 804 | #define MIPS_NR_N64_LINUX 5000 |
| 805 | #define MIPS_NR_N32_LINUX 6000 |
| 806 | |
| 807 | #define MIPS_NR_sigreturn MIPS_NR_LINUX + 119 |
| 808 | #define MIPS_NR_rt_sigreturn MIPS_NR_LINUX + 193 |
| 809 | #define MIPS_NR_N64_rt_sigreturn MIPS_NR_N64_LINUX + 211 |
| 810 | #define MIPS_NR_N32_rt_sigreturn MIPS_NR_N32_LINUX + 211 |
| 811 | |
| 812 | #define MIPS_INST_LI_V0_SIGRETURN 0x24020000 + MIPS_NR_sigreturn |
| 813 | #define MIPS_INST_LI_V0_RT_SIGRETURN 0x24020000 + MIPS_NR_rt_sigreturn |
| 814 | #define MIPS_INST_LI_V0_N64_RT_SIGRETURN 0x24020000 + MIPS_NR_N64_rt_sigreturn |
| 815 | #define MIPS_INST_LI_V0_N32_RT_SIGRETURN 0x24020000 + MIPS_NR_N32_rt_sigreturn |
| 816 | #define MIPS_INST_SYSCALL 0x0000000c |
| 817 | |
| 818 | static const struct tramp_frame mips_linux_o32_sigframe = { |
| 819 | SIGTRAMP_FRAME, |
| 820 | 4, |
| 821 | { |
| 822 | { MIPS_INST_LI_V0_SIGRETURN, -1 }, |
| 823 | { MIPS_INST_SYSCALL, -1 }, |
| 824 | { TRAMP_SENTINEL_INSN, -1 } |
| 825 | }, |
| 826 | mips_linux_o32_sigframe_init |
| 827 | }; |
| 828 | |
| 829 | static const struct tramp_frame mips_linux_o32_rt_sigframe = { |
| 830 | SIGTRAMP_FRAME, |
| 831 | 4, |
| 832 | { |
| 833 | { MIPS_INST_LI_V0_RT_SIGRETURN, -1 }, |
| 834 | { MIPS_INST_SYSCALL, -1 }, |
| 835 | { TRAMP_SENTINEL_INSN, -1 } }, |
| 836 | mips_linux_o32_sigframe_init |
| 837 | }; |
| 838 | |
| 839 | static const struct tramp_frame mips_linux_n32_rt_sigframe = { |
| 840 | SIGTRAMP_FRAME, |
| 841 | 4, |
| 842 | { |
| 843 | { MIPS_INST_LI_V0_N32_RT_SIGRETURN, -1 }, |
| 844 | { MIPS_INST_SYSCALL, -1 }, |
| 845 | { TRAMP_SENTINEL_INSN, -1 } |
| 846 | }, |
| 847 | mips_linux_n32n64_sigframe_init |
| 848 | }; |
| 849 | |
| 850 | static const struct tramp_frame mips_linux_n64_rt_sigframe = { |
| 851 | SIGTRAMP_FRAME, |
| 852 | 4, |
| 853 | { |
| 854 | { MIPS_INST_LI_V0_N64_RT_SIGRETURN, -1 }, |
| 855 | { MIPS_INST_SYSCALL, -1 }, |
| 856 | { TRAMP_SENTINEL_INSN, -1 } |
| 857 | }, |
| 858 | mips_linux_n32n64_sigframe_init |
| 859 | }; |
| 860 | |
| 861 | /* *INDENT-OFF* */ |
| 862 | /* The unwinder for o32 signal frames. The legacy structures look |
| 863 | like this: |
| 864 | |
| 865 | struct sigframe { |
| 866 | u32 sf_ass[4]; [argument save space for o32] |
| 867 | u32 sf_code[2]; [signal trampoline or fill] |
| 868 | struct sigcontext sf_sc; |
| 869 | sigset_t sf_mask; |
| 870 | }; |
| 871 | |
| 872 | struct sigcontext { |
| 873 | unsigned int sc_regmask; [Unused] |
| 874 | unsigned int sc_status; |
| 875 | unsigned long long sc_pc; |
| 876 | unsigned long long sc_regs[32]; |
| 877 | unsigned long long sc_fpregs[32]; |
| 878 | unsigned int sc_ownedfp; |
| 879 | unsigned int sc_fpc_csr; |
| 880 | unsigned int sc_fpc_eir; [Unused] |
| 881 | unsigned int sc_used_math; |
| 882 | unsigned int sc_ssflags; [Unused] |
| 883 | [Alignment hole of four bytes] |
| 884 | unsigned long long sc_mdhi; |
| 885 | unsigned long long sc_mdlo; |
| 886 | |
| 887 | unsigned int sc_cause; [Unused] |
| 888 | unsigned int sc_badvaddr; [Unused] |
| 889 | |
| 890 | unsigned long sc_sigset[4]; [kernel's sigset_t] |
| 891 | }; |
| 892 | |
| 893 | The RT signal frames look like this: |
| 894 | |
| 895 | struct rt_sigframe { |
| 896 | u32 rs_ass[4]; [argument save space for o32] |
| 897 | u32 rs_code[2] [signal trampoline or fill] |
| 898 | struct siginfo rs_info; |
| 899 | struct ucontext rs_uc; |
| 900 | }; |
| 901 | |
| 902 | struct ucontext { |
| 903 | unsigned long uc_flags; |
| 904 | struct ucontext *uc_link; |
| 905 | stack_t uc_stack; |
| 906 | [Alignment hole of four bytes] |
| 907 | struct sigcontext uc_mcontext; |
| 908 | sigset_t uc_sigmask; |
| 909 | }; */ |
| 910 | /* *INDENT-ON* */ |
| 911 | |
| 912 | #define SIGFRAME_SIGCONTEXT_OFFSET (6 * 4) |
| 913 | |
| 914 | #define RTSIGFRAME_SIGINFO_SIZE 128 |
| 915 | #define STACK_T_SIZE (3 * 4) |
| 916 | #define UCONTEXT_SIGCONTEXT_OFFSET (2 * 4 + STACK_T_SIZE + 4) |
| 917 | #define RTSIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \ |
| 918 | + RTSIGFRAME_SIGINFO_SIZE \ |
| 919 | + UCONTEXT_SIGCONTEXT_OFFSET) |
| 920 | |
| 921 | #define SIGCONTEXT_PC (1 * 8) |
| 922 | #define SIGCONTEXT_REGS (2 * 8) |
| 923 | #define SIGCONTEXT_FPREGS (34 * 8) |
| 924 | #define SIGCONTEXT_FPCSR (66 * 8 + 4) |
| 925 | #define SIGCONTEXT_HI (69 * 8) |
| 926 | #define SIGCONTEXT_LO (70 * 8) |
| 927 | #define SIGCONTEXT_CAUSE (71 * 8 + 0) |
| 928 | #define SIGCONTEXT_BADVADDR (71 * 8 + 4) |
| 929 | |
| 930 | #define SIGCONTEXT_REG_SIZE 8 |
| 931 | |
| 932 | static void |
| 933 | mips_linux_o32_sigframe_init (const struct tramp_frame *self, |
| 934 | struct frame_info *this_frame, |
| 935 | struct trad_frame_cache *this_cache, |
| 936 | CORE_ADDR func) |
| 937 | { |
| 938 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 939 | int ireg, reg_position; |
| 940 | CORE_ADDR frame_sp = get_frame_sp (this_frame); |
| 941 | CORE_ADDR sigcontext_base; |
| 942 | const struct mips_regnum *regs = mips_regnum (gdbarch); |
| 943 | CORE_ADDR regs_base; |
| 944 | |
| 945 | if (self == &mips_linux_o32_sigframe) |
| 946 | sigcontext_base = frame_sp + SIGFRAME_SIGCONTEXT_OFFSET; |
| 947 | else |
| 948 | sigcontext_base = frame_sp + RTSIGFRAME_SIGCONTEXT_OFFSET; |
| 949 | |
| 950 | /* I'm not proud of this hack. Eventually we will have the |
| 951 | infrastructure to indicate the size of saved registers on a |
| 952 | per-frame basis, but right now we don't; the kernel saves eight |
| 953 | bytes but we only want four. Use regs_base to access any |
| 954 | 64-bit fields. */ |
| 955 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 956 | regs_base = sigcontext_base + 4; |
| 957 | else |
| 958 | regs_base = sigcontext_base; |
| 959 | |
| 960 | if (mips_linux_restart_reg_p (gdbarch)) |
| 961 | trad_frame_set_reg_addr (this_cache, |
| 962 | (MIPS_RESTART_REGNUM |
| 963 | + gdbarch_num_regs (gdbarch)), |
| 964 | regs_base + SIGCONTEXT_REGS); |
| 965 | |
| 966 | for (ireg = 1; ireg < 32; ireg++) |
| 967 | trad_frame_set_reg_addr (this_cache, |
| 968 | ireg + MIPS_ZERO_REGNUM |
| 969 | + gdbarch_num_regs (gdbarch), |
| 970 | regs_base + SIGCONTEXT_REGS |
| 971 | + ireg * SIGCONTEXT_REG_SIZE); |
| 972 | |
| 973 | /* The way that floating point registers are saved, unfortunately, |
| 974 | depends on the architecture the kernel is built for. For the r3000 and |
| 975 | tx39, four bytes of each register are at the beginning of each of the |
| 976 | 32 eight byte slots. For everything else, the registers are saved |
| 977 | using double precision; only the even-numbered slots are initialized, |
| 978 | and the high bits are the odd-numbered register. Assume the latter |
| 979 | layout, since we can't tell, and it's much more common. Which bits are |
| 980 | the "high" bits depends on endianness. */ |
| 981 | for (ireg = 0; ireg < 32; ireg++) |
| 982 | if ((gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) != (ireg & 1)) |
| 983 | trad_frame_set_reg_addr (this_cache, |
| 984 | ireg + regs->fp0 + |
| 985 | gdbarch_num_regs (gdbarch), |
| 986 | sigcontext_base + SIGCONTEXT_FPREGS + 4 |
| 987 | + (ireg & ~1) * SIGCONTEXT_REG_SIZE); |
| 988 | else |
| 989 | trad_frame_set_reg_addr (this_cache, |
| 990 | ireg + regs->fp0 |
| 991 | + gdbarch_num_regs (gdbarch), |
| 992 | sigcontext_base + SIGCONTEXT_FPREGS |
| 993 | + (ireg & ~1) * SIGCONTEXT_REG_SIZE); |
| 994 | |
| 995 | trad_frame_set_reg_addr (this_cache, |
| 996 | regs->pc + gdbarch_num_regs (gdbarch), |
| 997 | regs_base + SIGCONTEXT_PC); |
| 998 | |
| 999 | trad_frame_set_reg_addr (this_cache, |
| 1000 | regs->fp_control_status |
| 1001 | + gdbarch_num_regs (gdbarch), |
| 1002 | sigcontext_base + SIGCONTEXT_FPCSR); |
| 1003 | trad_frame_set_reg_addr (this_cache, |
| 1004 | regs->hi + gdbarch_num_regs (gdbarch), |
| 1005 | regs_base + SIGCONTEXT_HI); |
| 1006 | trad_frame_set_reg_addr (this_cache, |
| 1007 | regs->lo + gdbarch_num_regs (gdbarch), |
| 1008 | regs_base + SIGCONTEXT_LO); |
| 1009 | trad_frame_set_reg_addr (this_cache, |
| 1010 | regs->cause + gdbarch_num_regs (gdbarch), |
| 1011 | sigcontext_base + SIGCONTEXT_CAUSE); |
| 1012 | trad_frame_set_reg_addr (this_cache, |
| 1013 | regs->badvaddr + gdbarch_num_regs (gdbarch), |
| 1014 | sigcontext_base + SIGCONTEXT_BADVADDR); |
| 1015 | |
| 1016 | /* Choice of the bottom of the sigframe is somewhat arbitrary. */ |
| 1017 | trad_frame_set_id (this_cache, frame_id_build (frame_sp, func)); |
| 1018 | } |
| 1019 | |
| 1020 | /* *INDENT-OFF* */ |
| 1021 | /* For N32/N64 things look different. There is no non-rt signal frame. |
| 1022 | |
| 1023 | struct rt_sigframe_n32 { |
| 1024 | u32 rs_ass[4]; [ argument save space for o32 ] |
| 1025 | u32 rs_code[2]; [ signal trampoline or fill ] |
| 1026 | struct siginfo rs_info; |
| 1027 | struct ucontextn32 rs_uc; |
| 1028 | }; |
| 1029 | |
| 1030 | struct ucontextn32 { |
| 1031 | u32 uc_flags; |
| 1032 | s32 uc_link; |
| 1033 | stack32_t uc_stack; |
| 1034 | struct sigcontext uc_mcontext; |
| 1035 | sigset_t uc_sigmask; [ mask last for extensibility ] |
| 1036 | }; |
| 1037 | |
| 1038 | struct rt_sigframe { |
| 1039 | u32 rs_ass[4]; [ argument save space for o32 ] |
| 1040 | u32 rs_code[2]; [ signal trampoline ] |
| 1041 | struct siginfo rs_info; |
| 1042 | struct ucontext rs_uc; |
| 1043 | }; |
| 1044 | |
| 1045 | struct ucontext { |
| 1046 | unsigned long uc_flags; |
| 1047 | struct ucontext *uc_link; |
| 1048 | stack_t uc_stack; |
| 1049 | struct sigcontext uc_mcontext; |
| 1050 | sigset_t uc_sigmask; [ mask last for extensibility ] |
| 1051 | }; |
| 1052 | |
| 1053 | And the sigcontext is different (this is for both n32 and n64): |
| 1054 | |
| 1055 | struct sigcontext { |
| 1056 | unsigned long long sc_regs[32]; |
| 1057 | unsigned long long sc_fpregs[32]; |
| 1058 | unsigned long long sc_mdhi; |
| 1059 | unsigned long long sc_hi1; |
| 1060 | unsigned long long sc_hi2; |
| 1061 | unsigned long long sc_hi3; |
| 1062 | unsigned long long sc_mdlo; |
| 1063 | unsigned long long sc_lo1; |
| 1064 | unsigned long long sc_lo2; |
| 1065 | unsigned long long sc_lo3; |
| 1066 | unsigned long long sc_pc; |
| 1067 | unsigned int sc_fpc_csr; |
| 1068 | unsigned int sc_used_math; |
| 1069 | unsigned int sc_dsp; |
| 1070 | unsigned int sc_reserved; |
| 1071 | }; |
| 1072 | |
| 1073 | That is the post-2.6.12 definition of the 64-bit sigcontext; before |
| 1074 | then, there were no hi1-hi3 or lo1-lo3. Cause and badvaddr were |
| 1075 | included too. */ |
| 1076 | /* *INDENT-ON* */ |
| 1077 | |
| 1078 | #define N32_STACK_T_SIZE STACK_T_SIZE |
| 1079 | #define N64_STACK_T_SIZE (2 * 8 + 4) |
| 1080 | #define N32_UCONTEXT_SIGCONTEXT_OFFSET (2 * 4 + N32_STACK_T_SIZE + 4) |
| 1081 | #define N64_UCONTEXT_SIGCONTEXT_OFFSET (2 * 8 + N64_STACK_T_SIZE + 4) |
| 1082 | #define N32_SIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \ |
| 1083 | + RTSIGFRAME_SIGINFO_SIZE \ |
| 1084 | + N32_UCONTEXT_SIGCONTEXT_OFFSET) |
| 1085 | #define N64_SIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \ |
| 1086 | + RTSIGFRAME_SIGINFO_SIZE \ |
| 1087 | + N64_UCONTEXT_SIGCONTEXT_OFFSET) |
| 1088 | |
| 1089 | #define N64_SIGCONTEXT_REGS (0 * 8) |
| 1090 | #define N64_SIGCONTEXT_FPREGS (32 * 8) |
| 1091 | #define N64_SIGCONTEXT_HI (64 * 8) |
| 1092 | #define N64_SIGCONTEXT_LO (68 * 8) |
| 1093 | #define N64_SIGCONTEXT_PC (72 * 8) |
| 1094 | #define N64_SIGCONTEXT_FPCSR (73 * 8) |
| 1095 | |
| 1096 | #define N64_SIGCONTEXT_REG_SIZE 8 |
| 1097 | |
| 1098 | static void |
| 1099 | mips_linux_n32n64_sigframe_init (const struct tramp_frame *self, |
| 1100 | struct frame_info *this_frame, |
| 1101 | struct trad_frame_cache *this_cache, |
| 1102 | CORE_ADDR func) |
| 1103 | { |
| 1104 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 1105 | int ireg, reg_position; |
| 1106 | CORE_ADDR frame_sp = get_frame_sp (this_frame); |
| 1107 | CORE_ADDR sigcontext_base; |
| 1108 | const struct mips_regnum *regs = mips_regnum (gdbarch); |
| 1109 | |
| 1110 | if (self == &mips_linux_n32_rt_sigframe) |
| 1111 | sigcontext_base = frame_sp + N32_SIGFRAME_SIGCONTEXT_OFFSET; |
| 1112 | else |
| 1113 | sigcontext_base = frame_sp + N64_SIGFRAME_SIGCONTEXT_OFFSET; |
| 1114 | |
| 1115 | if (mips_linux_restart_reg_p (gdbarch)) |
| 1116 | trad_frame_set_reg_addr (this_cache, |
| 1117 | (MIPS_RESTART_REGNUM |
| 1118 | + gdbarch_num_regs (gdbarch)), |
| 1119 | sigcontext_base + N64_SIGCONTEXT_REGS); |
| 1120 | |
| 1121 | for (ireg = 1; ireg < 32; ireg++) |
| 1122 | trad_frame_set_reg_addr (this_cache, |
| 1123 | ireg + MIPS_ZERO_REGNUM |
| 1124 | + gdbarch_num_regs (gdbarch), |
| 1125 | sigcontext_base + N64_SIGCONTEXT_REGS |
| 1126 | + ireg * N64_SIGCONTEXT_REG_SIZE); |
| 1127 | |
| 1128 | for (ireg = 0; ireg < 32; ireg++) |
| 1129 | trad_frame_set_reg_addr (this_cache, |
| 1130 | ireg + regs->fp0 |
| 1131 | + gdbarch_num_regs (gdbarch), |
| 1132 | sigcontext_base + N64_SIGCONTEXT_FPREGS |
| 1133 | + ireg * N64_SIGCONTEXT_REG_SIZE); |
| 1134 | |
| 1135 | trad_frame_set_reg_addr (this_cache, |
| 1136 | regs->pc + gdbarch_num_regs (gdbarch), |
| 1137 | sigcontext_base + N64_SIGCONTEXT_PC); |
| 1138 | |
| 1139 | trad_frame_set_reg_addr (this_cache, |
| 1140 | regs->fp_control_status |
| 1141 | + gdbarch_num_regs (gdbarch), |
| 1142 | sigcontext_base + N64_SIGCONTEXT_FPCSR); |
| 1143 | trad_frame_set_reg_addr (this_cache, |
| 1144 | regs->hi + gdbarch_num_regs (gdbarch), |
| 1145 | sigcontext_base + N64_SIGCONTEXT_HI); |
| 1146 | trad_frame_set_reg_addr (this_cache, |
| 1147 | regs->lo + gdbarch_num_regs (gdbarch), |
| 1148 | sigcontext_base + N64_SIGCONTEXT_LO); |
| 1149 | |
| 1150 | /* Choice of the bottom of the sigframe is somewhat arbitrary. */ |
| 1151 | trad_frame_set_id (this_cache, frame_id_build (frame_sp, func)); |
| 1152 | } |
| 1153 | |
| 1154 | static void |
| 1155 | mips_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) |
| 1156 | { |
| 1157 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 1158 | regcache_cooked_write_unsigned (regcache, gdbarch_pc_regnum (gdbarch), pc); |
| 1159 | |
| 1160 | /* Clear the syscall restart flag. */ |
| 1161 | if (mips_linux_restart_reg_p (gdbarch)) |
| 1162 | regcache_cooked_write_unsigned (regcache, MIPS_RESTART_REGNUM, 0); |
| 1163 | } |
| 1164 | |
| 1165 | /* Return 1 if MIPS_RESTART_REGNUM is usable. */ |
| 1166 | |
| 1167 | int |
| 1168 | mips_linux_restart_reg_p (struct gdbarch *gdbarch) |
| 1169 | { |
| 1170 | /* If we do not have a target description with registers, then |
| 1171 | MIPS_RESTART_REGNUM will not be included in the register set. */ |
| 1172 | if (!tdesc_has_registers (gdbarch_target_desc (gdbarch))) |
| 1173 | return 0; |
| 1174 | |
| 1175 | /* If we do, then MIPS_RESTART_REGNUM is safe to check; it will |
| 1176 | either be GPR-sized or missing. */ |
| 1177 | return register_size (gdbarch, MIPS_RESTART_REGNUM) > 0; |
| 1178 | } |
| 1179 | |
| 1180 | /* When FRAME is at a syscall instruction, return the PC of the next |
| 1181 | instruction to be executed. */ |
| 1182 | |
| 1183 | static CORE_ADDR |
| 1184 | mips_linux_syscall_next_pc (struct frame_info *frame) |
| 1185 | { |
| 1186 | CORE_ADDR pc = get_frame_pc (frame); |
| 1187 | ULONGEST v0 = get_frame_register_unsigned (frame, MIPS_V0_REGNUM); |
| 1188 | |
| 1189 | /* If we are about to make a sigreturn syscall, use the unwinder to |
| 1190 | decode the signal frame. */ |
| 1191 | if (v0 == MIPS_NR_sigreturn |
| 1192 | || v0 == MIPS_NR_rt_sigreturn |
| 1193 | || v0 == MIPS_NR_N64_rt_sigreturn |
| 1194 | || v0 == MIPS_NR_N32_rt_sigreturn) |
| 1195 | return frame_unwind_caller_pc (get_current_frame ()); |
| 1196 | |
| 1197 | return pc + 4; |
| 1198 | } |
| 1199 | |
| 1200 | /* Return the current system call's number present in the |
| 1201 | v0 register. When the function fails, it returns -1. */ |
| 1202 | |
| 1203 | static LONGEST |
| 1204 | mips_linux_get_syscall_number (struct gdbarch *gdbarch, |
| 1205 | ptid_t ptid) |
| 1206 | { |
| 1207 | struct regcache *regcache = get_thread_regcache (ptid); |
| 1208 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1209 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1210 | int regsize = register_size (gdbarch, MIPS_V0_REGNUM); |
| 1211 | /* The content of a register */ |
| 1212 | gdb_byte buf[8]; |
| 1213 | /* The result */ |
| 1214 | LONGEST ret; |
| 1215 | |
| 1216 | /* Make sure we're in a known ABI */ |
| 1217 | gdb_assert (tdep->mips_abi == MIPS_ABI_O32 |
| 1218 | || tdep->mips_abi == MIPS_ABI_N32 |
| 1219 | || tdep->mips_abi == MIPS_ABI_N64); |
| 1220 | |
| 1221 | gdb_assert (regsize <= sizeof (buf)); |
| 1222 | |
| 1223 | /* Getting the system call number from the register. |
| 1224 | syscall number is in v0 or $2. */ |
| 1225 | regcache_cooked_read (regcache, MIPS_V0_REGNUM, buf); |
| 1226 | |
| 1227 | ret = extract_signed_integer (buf, regsize, byte_order); |
| 1228 | |
| 1229 | return ret; |
| 1230 | } |
| 1231 | |
| 1232 | /* Initialize one of the GNU/Linux OS ABIs. */ |
| 1233 | |
| 1234 | static void |
| 1235 | mips_linux_init_abi (struct gdbarch_info info, |
| 1236 | struct gdbarch *gdbarch) |
| 1237 | { |
| 1238 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1239 | enum mips_abi abi = mips_abi (gdbarch); |
| 1240 | struct tdesc_arch_data *tdesc_data = (void *) info.tdep_info; |
| 1241 | |
| 1242 | linux_init_abi (info, gdbarch); |
| 1243 | |
| 1244 | /* Get the syscall number from the arch's register. */ |
| 1245 | set_gdbarch_get_syscall_number (gdbarch, mips_linux_get_syscall_number); |
| 1246 | |
| 1247 | switch (abi) |
| 1248 | { |
| 1249 | case MIPS_ABI_O32: |
| 1250 | set_gdbarch_get_longjmp_target (gdbarch, |
| 1251 | mips_linux_get_longjmp_target); |
| 1252 | set_solib_svr4_fetch_link_map_offsets |
| 1253 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 1254 | tramp_frame_prepend_unwinder (gdbarch, &mips_linux_o32_sigframe); |
| 1255 | tramp_frame_prepend_unwinder (gdbarch, &mips_linux_o32_rt_sigframe); |
| 1256 | set_xml_syscall_file_name ("syscalls/mips-o32-linux.xml"); |
| 1257 | break; |
| 1258 | case MIPS_ABI_N32: |
| 1259 | set_gdbarch_get_longjmp_target (gdbarch, |
| 1260 | mips_linux_get_longjmp_target); |
| 1261 | set_solib_svr4_fetch_link_map_offsets |
| 1262 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 1263 | set_gdbarch_long_double_bit (gdbarch, 128); |
| 1264 | /* These floatformats should probably be renamed. MIPS uses |
| 1265 | the same 128-bit IEEE floating point format that IA-64 uses, |
| 1266 | except that the quiet/signalling NaN bit is reversed (GDB |
| 1267 | does not distinguish between quiet and signalling NaNs). */ |
| 1268 | set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad); |
| 1269 | tramp_frame_prepend_unwinder (gdbarch, &mips_linux_n32_rt_sigframe); |
| 1270 | set_xml_syscall_file_name ("syscalls/mips-n32-linux.xml"); |
| 1271 | break; |
| 1272 | case MIPS_ABI_N64: |
| 1273 | set_gdbarch_get_longjmp_target (gdbarch, |
| 1274 | mips64_linux_get_longjmp_target); |
| 1275 | set_solib_svr4_fetch_link_map_offsets |
| 1276 | (gdbarch, svr4_lp64_fetch_link_map_offsets); |
| 1277 | set_gdbarch_long_double_bit (gdbarch, 128); |
| 1278 | /* These floatformats should probably be renamed. MIPS uses |
| 1279 | the same 128-bit IEEE floating point format that IA-64 uses, |
| 1280 | except that the quiet/signalling NaN bit is reversed (GDB |
| 1281 | does not distinguish between quiet and signalling NaNs). */ |
| 1282 | set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad); |
| 1283 | tramp_frame_prepend_unwinder (gdbarch, &mips_linux_n64_rt_sigframe); |
| 1284 | set_xml_syscall_file_name ("syscalls/mips-n64-linux.xml"); |
| 1285 | break; |
| 1286 | default: |
| 1287 | break; |
| 1288 | } |
| 1289 | |
| 1290 | set_gdbarch_skip_solib_resolver (gdbarch, mips_linux_skip_resolver); |
| 1291 | |
| 1292 | set_gdbarch_software_single_step (gdbarch, mips_software_single_step); |
| 1293 | |
| 1294 | /* Enable TLS support. */ |
| 1295 | set_gdbarch_fetch_tls_load_module_address (gdbarch, |
| 1296 | svr4_fetch_objfile_link_map); |
| 1297 | |
| 1298 | /* Initialize this lazily, to avoid an initialization order |
| 1299 | dependency on solib-svr4.c's _initialize routine. */ |
| 1300 | if (mips_svr4_so_ops.in_dynsym_resolve_code == NULL) |
| 1301 | { |
| 1302 | mips_svr4_so_ops = svr4_so_ops; |
| 1303 | mips_svr4_so_ops.in_dynsym_resolve_code |
| 1304 | = mips_linux_in_dynsym_resolve_code; |
| 1305 | } |
| 1306 | set_solib_ops (gdbarch, &mips_svr4_so_ops); |
| 1307 | |
| 1308 | set_gdbarch_write_pc (gdbarch, mips_linux_write_pc); |
| 1309 | |
| 1310 | set_gdbarch_core_read_description (gdbarch, |
| 1311 | mips_linux_core_read_description); |
| 1312 | |
| 1313 | set_gdbarch_regset_from_core_section (gdbarch, |
| 1314 | mips_linux_regset_from_core_section); |
| 1315 | |
| 1316 | tdep->syscall_next_pc = mips_linux_syscall_next_pc; |
| 1317 | |
| 1318 | if (tdesc_data) |
| 1319 | { |
| 1320 | const struct tdesc_feature *feature; |
| 1321 | |
| 1322 | /* If we have target-described registers, then we can safely |
| 1323 | reserve a number for MIPS_RESTART_REGNUM (whether it is |
| 1324 | described or not). */ |
| 1325 | gdb_assert (gdbarch_num_regs (gdbarch) <= MIPS_RESTART_REGNUM); |
| 1326 | set_gdbarch_num_regs (gdbarch, MIPS_RESTART_REGNUM + 1); |
| 1327 | set_gdbarch_num_pseudo_regs (gdbarch, MIPS_RESTART_REGNUM + 1); |
| 1328 | |
| 1329 | /* If it's present, then assign it to the reserved number. */ |
| 1330 | feature = tdesc_find_feature (info.target_desc, |
| 1331 | "org.gnu.gdb.mips.linux"); |
| 1332 | if (feature != NULL) |
| 1333 | tdesc_numbered_register (feature, tdesc_data, MIPS_RESTART_REGNUM, |
| 1334 | "restart"); |
| 1335 | } |
| 1336 | } |
| 1337 | |
| 1338 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 1339 | extern initialize_file_ftype _initialize_mips_linux_tdep; |
| 1340 | |
| 1341 | void |
| 1342 | _initialize_mips_linux_tdep (void) |
| 1343 | { |
| 1344 | const struct bfd_arch_info *arch_info; |
| 1345 | |
| 1346 | for (arch_info = bfd_lookup_arch (bfd_arch_mips, 0); |
| 1347 | arch_info != NULL; |
| 1348 | arch_info = arch_info->next) |
| 1349 | { |
| 1350 | gdbarch_register_osabi (bfd_arch_mips, arch_info->mach, |
| 1351 | GDB_OSABI_LINUX, |
| 1352 | mips_linux_init_abi); |
| 1353 | } |
| 1354 | } |