| 1 | /* Target-dependent code for GNU/Linux on MIPS processors. |
| 2 | |
| 3 | Copyright (C) 2001-2015 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 "frame.h" |
| 27 | #include "regcache.h" |
| 28 | #include "trad-frame.h" |
| 29 | #include "tramp-frame.h" |
| 30 | #include "gdbtypes.h" |
| 31 | #include "objfiles.h" |
| 32 | #include "solib.h" |
| 33 | #include "solist.h" |
| 34 | #include "symtab.h" |
| 35 | #include "target-descriptions.h" |
| 36 | #include "regset.h" |
| 37 | #include "mips-linux-tdep.h" |
| 38 | #include "glibc-tdep.h" |
| 39 | #include "linux-tdep.h" |
| 40 | #include "xml-syscall.h" |
| 41 | #include "gdb_signals.h" |
| 42 | |
| 43 | static struct target_so_ops mips_svr4_so_ops; |
| 44 | |
| 45 | /* This enum represents the signals' numbers on the MIPS |
| 46 | architecture. It just contains the signal definitions which are |
| 47 | different from the generic implementation. |
| 48 | |
| 49 | It is derived from the file <arch/mips/include/uapi/asm/signal.h>, |
| 50 | from the Linux kernel tree. */ |
| 51 | |
| 52 | enum |
| 53 | { |
| 54 | MIPS_LINUX_SIGEMT = 7, |
| 55 | MIPS_LINUX_SIGBUS = 10, |
| 56 | MIPS_LINUX_SIGSYS = 12, |
| 57 | MIPS_LINUX_SIGUSR1 = 16, |
| 58 | MIPS_LINUX_SIGUSR2 = 17, |
| 59 | MIPS_LINUX_SIGCHLD = 18, |
| 60 | MIPS_LINUX_SIGCLD = MIPS_LINUX_SIGCHLD, |
| 61 | MIPS_LINUX_SIGPWR = 19, |
| 62 | MIPS_LINUX_SIGWINCH = 20, |
| 63 | MIPS_LINUX_SIGURG = 21, |
| 64 | MIPS_LINUX_SIGIO = 22, |
| 65 | MIPS_LINUX_SIGPOLL = MIPS_LINUX_SIGIO, |
| 66 | MIPS_LINUX_SIGSTOP = 23, |
| 67 | MIPS_LINUX_SIGTSTP = 24, |
| 68 | MIPS_LINUX_SIGCONT = 25, |
| 69 | MIPS_LINUX_SIGTTIN = 26, |
| 70 | MIPS_LINUX_SIGTTOU = 27, |
| 71 | MIPS_LINUX_SIGVTALRM = 28, |
| 72 | MIPS_LINUX_SIGPROF = 29, |
| 73 | MIPS_LINUX_SIGXCPU = 30, |
| 74 | MIPS_LINUX_SIGXFSZ = 31, |
| 75 | |
| 76 | MIPS_LINUX_SIGRTMIN = 32, |
| 77 | MIPS_LINUX_SIGRT64 = 64, |
| 78 | MIPS_LINUX_SIGRTMAX = 127, |
| 79 | }; |
| 80 | |
| 81 | /* Figure out where the longjmp will land. |
| 82 | We expect the first arg to be a pointer to the jmp_buf structure |
| 83 | from which we extract the pc (MIPS_LINUX_JB_PC) that we will land |
| 84 | at. The pc is copied into PC. This routine returns 1 on |
| 85 | success. */ |
| 86 | |
| 87 | #define MIPS_LINUX_JB_ELEMENT_SIZE 4 |
| 88 | #define MIPS_LINUX_JB_PC 0 |
| 89 | |
| 90 | static int |
| 91 | mips_linux_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
| 92 | { |
| 93 | CORE_ADDR jb_addr; |
| 94 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 95 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 96 | gdb_byte buf[gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT]; |
| 97 | |
| 98 | jb_addr = get_frame_register_unsigned (frame, MIPS_A0_REGNUM); |
| 99 | |
| 100 | if (target_read_memory ((jb_addr |
| 101 | + MIPS_LINUX_JB_PC * MIPS_LINUX_JB_ELEMENT_SIZE), |
| 102 | buf, gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT)) |
| 103 | return 0; |
| 104 | |
| 105 | *pc = extract_unsigned_integer (buf, |
| 106 | gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT, |
| 107 | byte_order); |
| 108 | |
| 109 | return 1; |
| 110 | } |
| 111 | |
| 112 | /* Transform the bits comprising a 32-bit register to the right size |
| 113 | for regcache_raw_supply(). This is needed when mips_isa_regsize() |
| 114 | is 8. */ |
| 115 | |
| 116 | static void |
| 117 | supply_32bit_reg (struct regcache *regcache, int regnum, const void *addr) |
| 118 | { |
| 119 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 120 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 121 | gdb_byte buf[MAX_REGISTER_SIZE]; |
| 122 | store_signed_integer (buf, register_size (gdbarch, regnum), byte_order, |
| 123 | extract_signed_integer ((const gdb_byte *) addr, 4, |
| 124 | byte_order)); |
| 125 | regcache_raw_supply (regcache, regnum, buf); |
| 126 | } |
| 127 | |
| 128 | /* Unpack an elf_gregset_t into GDB's register cache. */ |
| 129 | |
| 130 | void |
| 131 | mips_supply_gregset (struct regcache *regcache, |
| 132 | const mips_elf_gregset_t *gregsetp) |
| 133 | { |
| 134 | int regi; |
| 135 | const mips_elf_greg_t *regp = *gregsetp; |
| 136 | char zerobuf[MAX_REGISTER_SIZE]; |
| 137 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 138 | |
| 139 | memset (zerobuf, 0, MAX_REGISTER_SIZE); |
| 140 | |
| 141 | for (regi = EF_REG0 + 1; regi <= EF_REG31; regi++) |
| 142 | supply_32bit_reg (regcache, regi - EF_REG0, regp + regi); |
| 143 | |
| 144 | if (mips_linux_restart_reg_p (gdbarch)) |
| 145 | supply_32bit_reg (regcache, MIPS_RESTART_REGNUM, regp + EF_REG0); |
| 146 | |
| 147 | supply_32bit_reg (regcache, mips_regnum (gdbarch)->lo, regp + EF_LO); |
| 148 | supply_32bit_reg (regcache, mips_regnum (gdbarch)->hi, regp + EF_HI); |
| 149 | |
| 150 | supply_32bit_reg (regcache, mips_regnum (gdbarch)->pc, |
| 151 | regp + EF_CP0_EPC); |
| 152 | supply_32bit_reg (regcache, mips_regnum (gdbarch)->badvaddr, |
| 153 | regp + EF_CP0_BADVADDR); |
| 154 | supply_32bit_reg (regcache, MIPS_PS_REGNUM, regp + EF_CP0_STATUS); |
| 155 | supply_32bit_reg (regcache, mips_regnum (gdbarch)->cause, |
| 156 | regp + EF_CP0_CAUSE); |
| 157 | |
| 158 | /* Fill the inaccessible zero register with zero. */ |
| 159 | regcache_raw_supply (regcache, MIPS_ZERO_REGNUM, zerobuf); |
| 160 | } |
| 161 | |
| 162 | static void |
| 163 | mips_supply_gregset_wrapper (const struct regset *regset, |
| 164 | struct regcache *regcache, |
| 165 | int regnum, const void *gregs, size_t len) |
| 166 | { |
| 167 | gdb_assert (len >= sizeof (mips_elf_gregset_t)); |
| 168 | |
| 169 | mips_supply_gregset (regcache, (const mips_elf_gregset_t *)gregs); |
| 170 | } |
| 171 | |
| 172 | /* Pack our registers (or one register) into an elf_gregset_t. */ |
| 173 | |
| 174 | void |
| 175 | mips_fill_gregset (const struct regcache *regcache, |
| 176 | mips_elf_gregset_t *gregsetp, int regno) |
| 177 | { |
| 178 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 179 | int regaddr, regi; |
| 180 | mips_elf_greg_t *regp = *gregsetp; |
| 181 | void *dst; |
| 182 | |
| 183 | if (regno == -1) |
| 184 | { |
| 185 | memset (regp, 0, sizeof (mips_elf_gregset_t)); |
| 186 | for (regi = 1; regi < 32; regi++) |
| 187 | mips_fill_gregset (regcache, gregsetp, regi); |
| 188 | mips_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->lo); |
| 189 | mips_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->hi); |
| 190 | mips_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->pc); |
| 191 | mips_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->badvaddr); |
| 192 | mips_fill_gregset (regcache, gregsetp, MIPS_PS_REGNUM); |
| 193 | mips_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->cause); |
| 194 | mips_fill_gregset (regcache, gregsetp, MIPS_RESTART_REGNUM); |
| 195 | return; |
| 196 | } |
| 197 | |
| 198 | if (regno > 0 && regno < 32) |
| 199 | { |
| 200 | dst = regp + regno + EF_REG0; |
| 201 | regcache_raw_collect (regcache, regno, dst); |
| 202 | return; |
| 203 | } |
| 204 | |
| 205 | if (regno == mips_regnum (gdbarch)->lo) |
| 206 | regaddr = EF_LO; |
| 207 | else if (regno == mips_regnum (gdbarch)->hi) |
| 208 | regaddr = EF_HI; |
| 209 | else if (regno == mips_regnum (gdbarch)->pc) |
| 210 | regaddr = EF_CP0_EPC; |
| 211 | else if (regno == mips_regnum (gdbarch)->badvaddr) |
| 212 | regaddr = EF_CP0_BADVADDR; |
| 213 | else if (regno == MIPS_PS_REGNUM) |
| 214 | regaddr = EF_CP0_STATUS; |
| 215 | else if (regno == mips_regnum (gdbarch)->cause) |
| 216 | regaddr = EF_CP0_CAUSE; |
| 217 | else if (mips_linux_restart_reg_p (gdbarch) |
| 218 | && regno == MIPS_RESTART_REGNUM) |
| 219 | regaddr = EF_REG0; |
| 220 | else |
| 221 | regaddr = -1; |
| 222 | |
| 223 | if (regaddr != -1) |
| 224 | { |
| 225 | dst = regp + regaddr; |
| 226 | regcache_raw_collect (regcache, regno, dst); |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | static void |
| 231 | mips_fill_gregset_wrapper (const struct regset *regset, |
| 232 | const struct regcache *regcache, |
| 233 | int regnum, void *gregs, size_t len) |
| 234 | { |
| 235 | gdb_assert (len >= sizeof (mips_elf_gregset_t)); |
| 236 | |
| 237 | mips_fill_gregset (regcache, (mips_elf_gregset_t *)gregs, regnum); |
| 238 | } |
| 239 | |
| 240 | /* Likewise, unpack an elf_fpregset_t. */ |
| 241 | |
| 242 | void |
| 243 | mips_supply_fpregset (struct regcache *regcache, |
| 244 | const mips_elf_fpregset_t *fpregsetp) |
| 245 | { |
| 246 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 247 | int regi; |
| 248 | char zerobuf[MAX_REGISTER_SIZE]; |
| 249 | |
| 250 | memset (zerobuf, 0, MAX_REGISTER_SIZE); |
| 251 | |
| 252 | for (regi = 0; regi < 32; regi++) |
| 253 | regcache_raw_supply (regcache, |
| 254 | gdbarch_fp0_regnum (gdbarch) + regi, |
| 255 | *fpregsetp + regi); |
| 256 | |
| 257 | regcache_raw_supply (regcache, |
| 258 | mips_regnum (gdbarch)->fp_control_status, |
| 259 | *fpregsetp + 32); |
| 260 | |
| 261 | /* FIXME: how can we supply FCRIR? The ABI doesn't tell us. */ |
| 262 | regcache_raw_supply (regcache, |
| 263 | mips_regnum (gdbarch)->fp_implementation_revision, |
| 264 | zerobuf); |
| 265 | } |
| 266 | |
| 267 | static void |
| 268 | mips_supply_fpregset_wrapper (const struct regset *regset, |
| 269 | struct regcache *regcache, |
| 270 | int regnum, const void *gregs, size_t len) |
| 271 | { |
| 272 | gdb_assert (len >= sizeof (mips_elf_fpregset_t)); |
| 273 | |
| 274 | mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *)gregs); |
| 275 | } |
| 276 | |
| 277 | /* Likewise, pack one or all floating point registers into an |
| 278 | elf_fpregset_t. */ |
| 279 | |
| 280 | void |
| 281 | mips_fill_fpregset (const struct regcache *regcache, |
| 282 | mips_elf_fpregset_t *fpregsetp, int regno) |
| 283 | { |
| 284 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 285 | char *to; |
| 286 | |
| 287 | if ((regno >= gdbarch_fp0_regnum (gdbarch)) |
| 288 | && (regno < gdbarch_fp0_regnum (gdbarch) + 32)) |
| 289 | { |
| 290 | to = (char *) (*fpregsetp + regno - gdbarch_fp0_regnum (gdbarch)); |
| 291 | regcache_raw_collect (regcache, regno, to); |
| 292 | } |
| 293 | else if (regno == mips_regnum (gdbarch)->fp_control_status) |
| 294 | { |
| 295 | to = (char *) (*fpregsetp + 32); |
| 296 | regcache_raw_collect (regcache, regno, to); |
| 297 | } |
| 298 | else if (regno == -1) |
| 299 | { |
| 300 | int regi; |
| 301 | |
| 302 | for (regi = 0; regi < 32; regi++) |
| 303 | mips_fill_fpregset (regcache, fpregsetp, |
| 304 | gdbarch_fp0_regnum (gdbarch) + regi); |
| 305 | mips_fill_fpregset (regcache, fpregsetp, |
| 306 | mips_regnum (gdbarch)->fp_control_status); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | static void |
| 311 | mips_fill_fpregset_wrapper (const struct regset *regset, |
| 312 | const struct regcache *regcache, |
| 313 | int regnum, void *gregs, size_t len) |
| 314 | { |
| 315 | gdb_assert (len >= sizeof (mips_elf_fpregset_t)); |
| 316 | |
| 317 | mips_fill_fpregset (regcache, (mips_elf_fpregset_t *)gregs, regnum); |
| 318 | } |
| 319 | |
| 320 | /* Support for 64-bit ABIs. */ |
| 321 | |
| 322 | /* Figure out where the longjmp will land. |
| 323 | We expect the first arg to be a pointer to the jmp_buf structure |
| 324 | from which we extract the pc (MIPS_LINUX_JB_PC) that we will land |
| 325 | at. The pc is copied into PC. This routine returns 1 on |
| 326 | success. */ |
| 327 | |
| 328 | /* Details about jmp_buf. */ |
| 329 | |
| 330 | #define MIPS64_LINUX_JB_PC 0 |
| 331 | |
| 332 | static int |
| 333 | mips64_linux_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
| 334 | { |
| 335 | CORE_ADDR jb_addr; |
| 336 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 337 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 338 | gdb_byte *buf |
| 339 | = (gdb_byte *) alloca (gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT); |
| 340 | int element_size = gdbarch_ptr_bit (gdbarch) == 32 ? 4 : 8; |
| 341 | |
| 342 | jb_addr = get_frame_register_unsigned (frame, MIPS_A0_REGNUM); |
| 343 | |
| 344 | if (target_read_memory (jb_addr + MIPS64_LINUX_JB_PC * element_size, |
| 345 | buf, |
| 346 | gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT)) |
| 347 | return 0; |
| 348 | |
| 349 | *pc = extract_unsigned_integer (buf, |
| 350 | gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT, |
| 351 | byte_order); |
| 352 | |
| 353 | return 1; |
| 354 | } |
| 355 | |
| 356 | /* Register set support functions. These operate on standard 64-bit |
| 357 | regsets, but work whether the target is 32-bit or 64-bit. A 32-bit |
| 358 | target will still use the 64-bit format for PTRACE_GETREGS. */ |
| 359 | |
| 360 | /* Supply a 64-bit register. */ |
| 361 | |
| 362 | static void |
| 363 | supply_64bit_reg (struct regcache *regcache, int regnum, |
| 364 | const gdb_byte *buf) |
| 365 | { |
| 366 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 367 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG |
| 368 | && register_size (gdbarch, regnum) == 4) |
| 369 | regcache_raw_supply (regcache, regnum, buf + 4); |
| 370 | else |
| 371 | regcache_raw_supply (regcache, regnum, buf); |
| 372 | } |
| 373 | |
| 374 | /* Unpack a 64-bit elf_gregset_t into GDB's register cache. */ |
| 375 | |
| 376 | void |
| 377 | mips64_supply_gregset (struct regcache *regcache, |
| 378 | const mips64_elf_gregset_t *gregsetp) |
| 379 | { |
| 380 | int regi; |
| 381 | const mips64_elf_greg_t *regp = *gregsetp; |
| 382 | gdb_byte zerobuf[MAX_REGISTER_SIZE]; |
| 383 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 384 | |
| 385 | memset (zerobuf, 0, MAX_REGISTER_SIZE); |
| 386 | |
| 387 | for (regi = MIPS64_EF_REG0 + 1; regi <= MIPS64_EF_REG31; regi++) |
| 388 | supply_64bit_reg (regcache, regi - MIPS64_EF_REG0, |
| 389 | (const gdb_byte *) (regp + regi)); |
| 390 | |
| 391 | if (mips_linux_restart_reg_p (gdbarch)) |
| 392 | supply_64bit_reg (regcache, MIPS_RESTART_REGNUM, |
| 393 | (const gdb_byte *) (regp + MIPS64_EF_REG0)); |
| 394 | |
| 395 | supply_64bit_reg (regcache, mips_regnum (gdbarch)->lo, |
| 396 | (const gdb_byte *) (regp + MIPS64_EF_LO)); |
| 397 | supply_64bit_reg (regcache, mips_regnum (gdbarch)->hi, |
| 398 | (const gdb_byte *) (regp + MIPS64_EF_HI)); |
| 399 | |
| 400 | supply_64bit_reg (regcache, mips_regnum (gdbarch)->pc, |
| 401 | (const gdb_byte *) (regp + MIPS64_EF_CP0_EPC)); |
| 402 | supply_64bit_reg (regcache, mips_regnum (gdbarch)->badvaddr, |
| 403 | (const gdb_byte *) (regp + MIPS64_EF_CP0_BADVADDR)); |
| 404 | supply_64bit_reg (regcache, MIPS_PS_REGNUM, |
| 405 | (const gdb_byte *) (regp + MIPS64_EF_CP0_STATUS)); |
| 406 | supply_64bit_reg (regcache, mips_regnum (gdbarch)->cause, |
| 407 | (const gdb_byte *) (regp + MIPS64_EF_CP0_CAUSE)); |
| 408 | |
| 409 | /* Fill the inaccessible zero register with zero. */ |
| 410 | regcache_raw_supply (regcache, MIPS_ZERO_REGNUM, zerobuf); |
| 411 | } |
| 412 | |
| 413 | static void |
| 414 | mips64_supply_gregset_wrapper (const struct regset *regset, |
| 415 | struct regcache *regcache, |
| 416 | int regnum, const void *gregs, size_t len) |
| 417 | { |
| 418 | gdb_assert (len >= sizeof (mips64_elf_gregset_t)); |
| 419 | |
| 420 | mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *)gregs); |
| 421 | } |
| 422 | |
| 423 | /* Pack our registers (or one register) into a 64-bit elf_gregset_t. */ |
| 424 | |
| 425 | void |
| 426 | mips64_fill_gregset (const struct regcache *regcache, |
| 427 | mips64_elf_gregset_t *gregsetp, int regno) |
| 428 | { |
| 429 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 430 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 431 | int regaddr, regi; |
| 432 | mips64_elf_greg_t *regp = *gregsetp; |
| 433 | void *dst; |
| 434 | |
| 435 | if (regno == -1) |
| 436 | { |
| 437 | memset (regp, 0, sizeof (mips64_elf_gregset_t)); |
| 438 | for (regi = 1; regi < 32; regi++) |
| 439 | mips64_fill_gregset (regcache, gregsetp, regi); |
| 440 | mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->lo); |
| 441 | mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->hi); |
| 442 | mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->pc); |
| 443 | mips64_fill_gregset (regcache, gregsetp, |
| 444 | mips_regnum (gdbarch)->badvaddr); |
| 445 | mips64_fill_gregset (regcache, gregsetp, MIPS_PS_REGNUM); |
| 446 | mips64_fill_gregset (regcache, gregsetp, mips_regnum (gdbarch)->cause); |
| 447 | mips64_fill_gregset (regcache, gregsetp, MIPS_RESTART_REGNUM); |
| 448 | return; |
| 449 | } |
| 450 | |
| 451 | if (regno > 0 && regno < 32) |
| 452 | regaddr = regno + MIPS64_EF_REG0; |
| 453 | else if (regno == mips_regnum (gdbarch)->lo) |
| 454 | regaddr = MIPS64_EF_LO; |
| 455 | else if (regno == mips_regnum (gdbarch)->hi) |
| 456 | regaddr = MIPS64_EF_HI; |
| 457 | else if (regno == mips_regnum (gdbarch)->pc) |
| 458 | regaddr = MIPS64_EF_CP0_EPC; |
| 459 | else if (regno == mips_regnum (gdbarch)->badvaddr) |
| 460 | regaddr = MIPS64_EF_CP0_BADVADDR; |
| 461 | else if (regno == MIPS_PS_REGNUM) |
| 462 | regaddr = MIPS64_EF_CP0_STATUS; |
| 463 | else if (regno == mips_regnum (gdbarch)->cause) |
| 464 | regaddr = MIPS64_EF_CP0_CAUSE; |
| 465 | else if (mips_linux_restart_reg_p (gdbarch) |
| 466 | && regno == MIPS_RESTART_REGNUM) |
| 467 | regaddr = MIPS64_EF_REG0; |
| 468 | else |
| 469 | regaddr = -1; |
| 470 | |
| 471 | if (regaddr != -1) |
| 472 | { |
| 473 | gdb_byte buf[MAX_REGISTER_SIZE]; |
| 474 | LONGEST val; |
| 475 | |
| 476 | regcache_raw_collect (regcache, regno, buf); |
| 477 | val = extract_signed_integer (buf, register_size (gdbarch, regno), |
| 478 | byte_order); |
| 479 | dst = regp + regaddr; |
| 480 | store_signed_integer ((gdb_byte *) dst, 8, byte_order, val); |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | static void |
| 485 | mips64_fill_gregset_wrapper (const struct regset *regset, |
| 486 | const struct regcache *regcache, |
| 487 | int regnum, void *gregs, size_t len) |
| 488 | { |
| 489 | gdb_assert (len >= sizeof (mips64_elf_gregset_t)); |
| 490 | |
| 491 | mips64_fill_gregset (regcache, (mips64_elf_gregset_t *)gregs, regnum); |
| 492 | } |
| 493 | |
| 494 | /* Likewise, unpack an elf_fpregset_t. */ |
| 495 | |
| 496 | void |
| 497 | mips64_supply_fpregset (struct regcache *regcache, |
| 498 | const mips64_elf_fpregset_t *fpregsetp) |
| 499 | { |
| 500 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 501 | int regi; |
| 502 | |
| 503 | /* See mips_linux_o32_sigframe_init for a description of the |
| 504 | peculiar FP register layout. */ |
| 505 | if (register_size (gdbarch, gdbarch_fp0_regnum (gdbarch)) == 4) |
| 506 | for (regi = 0; regi < 32; regi++) |
| 507 | { |
| 508 | const gdb_byte *reg_ptr |
| 509 | = (const gdb_byte *) (*fpregsetp + (regi & ~1)); |
| 510 | if ((gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) != (regi & 1)) |
| 511 | reg_ptr += 4; |
| 512 | regcache_raw_supply (regcache, |
| 513 | gdbarch_fp0_regnum (gdbarch) + regi, |
| 514 | reg_ptr); |
| 515 | } |
| 516 | else |
| 517 | for (regi = 0; regi < 32; regi++) |
| 518 | regcache_raw_supply (regcache, |
| 519 | gdbarch_fp0_regnum (gdbarch) + regi, |
| 520 | (const char *) (*fpregsetp + regi)); |
| 521 | |
| 522 | supply_32bit_reg (regcache, mips_regnum (gdbarch)->fp_control_status, |
| 523 | (const gdb_byte *) (*fpregsetp + 32)); |
| 524 | |
| 525 | /* The ABI doesn't tell us how to supply FCRIR, and core dumps don't |
| 526 | include it - but the result of PTRACE_GETFPREGS does. The best we |
| 527 | can do is to assume that its value is present. */ |
| 528 | supply_32bit_reg (regcache, |
| 529 | mips_regnum (gdbarch)->fp_implementation_revision, |
| 530 | (const gdb_byte *) (*fpregsetp + 32) + 4); |
| 531 | } |
| 532 | |
| 533 | static void |
| 534 | mips64_supply_fpregset_wrapper (const struct regset *regset, |
| 535 | struct regcache *regcache, |
| 536 | int regnum, const void *gregs, size_t len) |
| 537 | { |
| 538 | gdb_assert (len >= sizeof (mips64_elf_fpregset_t)); |
| 539 | |
| 540 | mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *)gregs); |
| 541 | } |
| 542 | |
| 543 | /* Likewise, pack one or all floating point registers into an |
| 544 | elf_fpregset_t. */ |
| 545 | |
| 546 | void |
| 547 | mips64_fill_fpregset (const struct regcache *regcache, |
| 548 | mips64_elf_fpregset_t *fpregsetp, int regno) |
| 549 | { |
| 550 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 551 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 552 | gdb_byte *to; |
| 553 | |
| 554 | if ((regno >= gdbarch_fp0_regnum (gdbarch)) |
| 555 | && (regno < gdbarch_fp0_regnum (gdbarch) + 32)) |
| 556 | { |
| 557 | /* See mips_linux_o32_sigframe_init for a description of the |
| 558 | peculiar FP register layout. */ |
| 559 | if (register_size (gdbarch, regno) == 4) |
| 560 | { |
| 561 | int regi = regno - gdbarch_fp0_regnum (gdbarch); |
| 562 | |
| 563 | to = (gdb_byte *) (*fpregsetp + (regi & ~1)); |
| 564 | if ((gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) != (regi & 1)) |
| 565 | to += 4; |
| 566 | regcache_raw_collect (regcache, regno, to); |
| 567 | } |
| 568 | else |
| 569 | { |
| 570 | to = (gdb_byte *) (*fpregsetp + regno |
| 571 | - gdbarch_fp0_regnum (gdbarch)); |
| 572 | regcache_raw_collect (regcache, regno, to); |
| 573 | } |
| 574 | } |
| 575 | else if (regno == mips_regnum (gdbarch)->fp_control_status) |
| 576 | { |
| 577 | gdb_byte buf[MAX_REGISTER_SIZE]; |
| 578 | LONGEST val; |
| 579 | |
| 580 | regcache_raw_collect (regcache, regno, buf); |
| 581 | val = extract_signed_integer (buf, register_size (gdbarch, regno), |
| 582 | byte_order); |
| 583 | to = (gdb_byte *) (*fpregsetp + 32); |
| 584 | store_signed_integer (to, 4, byte_order, val); |
| 585 | } |
| 586 | else if (regno == mips_regnum (gdbarch)->fp_implementation_revision) |
| 587 | { |
| 588 | gdb_byte buf[MAX_REGISTER_SIZE]; |
| 589 | LONGEST val; |
| 590 | |
| 591 | regcache_raw_collect (regcache, regno, buf); |
| 592 | val = extract_signed_integer (buf, register_size (gdbarch, regno), |
| 593 | byte_order); |
| 594 | to = (gdb_byte *) (*fpregsetp + 32) + 4; |
| 595 | store_signed_integer (to, 4, byte_order, val); |
| 596 | } |
| 597 | else if (regno == -1) |
| 598 | { |
| 599 | int regi; |
| 600 | |
| 601 | for (regi = 0; regi < 32; regi++) |
| 602 | mips64_fill_fpregset (regcache, fpregsetp, |
| 603 | gdbarch_fp0_regnum (gdbarch) + regi); |
| 604 | mips64_fill_fpregset (regcache, fpregsetp, |
| 605 | mips_regnum (gdbarch)->fp_control_status); |
| 606 | mips64_fill_fpregset (regcache, fpregsetp, |
| 607 | mips_regnum (gdbarch)->fp_implementation_revision); |
| 608 | } |
| 609 | } |
| 610 | |
| 611 | static void |
| 612 | mips64_fill_fpregset_wrapper (const struct regset *regset, |
| 613 | const struct regcache *regcache, |
| 614 | int regnum, void *gregs, size_t len) |
| 615 | { |
| 616 | gdb_assert (len >= sizeof (mips64_elf_fpregset_t)); |
| 617 | |
| 618 | mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *)gregs, regnum); |
| 619 | } |
| 620 | |
| 621 | static const struct regset mips_linux_gregset = |
| 622 | { |
| 623 | NULL, mips_supply_gregset_wrapper, mips_fill_gregset_wrapper |
| 624 | }; |
| 625 | |
| 626 | static const struct regset mips64_linux_gregset = |
| 627 | { |
| 628 | NULL, mips64_supply_gregset_wrapper, mips64_fill_gregset_wrapper |
| 629 | }; |
| 630 | |
| 631 | static const struct regset mips_linux_fpregset = |
| 632 | { |
| 633 | NULL, mips_supply_fpregset_wrapper, mips_fill_fpregset_wrapper |
| 634 | }; |
| 635 | |
| 636 | static const struct regset mips64_linux_fpregset = |
| 637 | { |
| 638 | NULL, mips64_supply_fpregset_wrapper, mips64_fill_fpregset_wrapper |
| 639 | }; |
| 640 | |
| 641 | static void |
| 642 | mips_linux_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| 643 | iterate_over_regset_sections_cb *cb, |
| 644 | void *cb_data, |
| 645 | const struct regcache *regcache) |
| 646 | { |
| 647 | if (register_size (gdbarch, MIPS_ZERO_REGNUM) == 4) |
| 648 | { |
| 649 | cb (".reg", sizeof (mips_elf_gregset_t), &mips_linux_gregset, |
| 650 | NULL, cb_data); |
| 651 | cb (".reg2", sizeof (mips_elf_fpregset_t), &mips_linux_fpregset, |
| 652 | NULL, cb_data); |
| 653 | } |
| 654 | else |
| 655 | { |
| 656 | cb (".reg", sizeof (mips64_elf_gregset_t), &mips64_linux_gregset, |
| 657 | NULL, cb_data); |
| 658 | cb (".reg2", sizeof (mips64_elf_fpregset_t), &mips64_linux_fpregset, |
| 659 | NULL, cb_data); |
| 660 | } |
| 661 | } |
| 662 | |
| 663 | static const struct target_desc * |
| 664 | mips_linux_core_read_description (struct gdbarch *gdbarch, |
| 665 | struct target_ops *target, |
| 666 | bfd *abfd) |
| 667 | { |
| 668 | asection *section = bfd_get_section_by_name (abfd, ".reg"); |
| 669 | if (! section) |
| 670 | return NULL; |
| 671 | |
| 672 | switch (bfd_section_size (abfd, section)) |
| 673 | { |
| 674 | case sizeof (mips_elf_gregset_t): |
| 675 | return mips_tdesc_gp32; |
| 676 | |
| 677 | case sizeof (mips64_elf_gregset_t): |
| 678 | return mips_tdesc_gp64; |
| 679 | |
| 680 | default: |
| 681 | return NULL; |
| 682 | } |
| 683 | } |
| 684 | |
| 685 | |
| 686 | /* Check the code at PC for a dynamic linker lazy resolution stub. |
| 687 | GNU ld for MIPS has put lazy resolution stubs into a ".MIPS.stubs" |
| 688 | section uniformly since version 2.15. If the pc is in that section, |
| 689 | then we are in such a stub. Before that ".stub" was used in 32-bit |
| 690 | ELF binaries, however we do not bother checking for that since we |
| 691 | have never had and that case should be extremely rare these days. |
| 692 | Instead we pattern-match on the code generated by GNU ld. They look |
| 693 | like this: |
| 694 | |
| 695 | lw t9,0x8010(gp) |
| 696 | addu t7,ra |
| 697 | jalr t9,ra |
| 698 | addiu t8,zero,INDEX |
| 699 | |
| 700 | (with the appropriate doubleword instructions for N64). As any lazy |
| 701 | resolution stubs in microMIPS binaries will always be in a |
| 702 | ".MIPS.stubs" section we only ever verify standard MIPS patterns. */ |
| 703 | |
| 704 | static int |
| 705 | mips_linux_in_dynsym_stub (CORE_ADDR pc) |
| 706 | { |
| 707 | gdb_byte buf[28], *p; |
| 708 | ULONGEST insn, insn1; |
| 709 | int n64 = (mips_abi (target_gdbarch ()) == MIPS_ABI_N64); |
| 710 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 711 | |
| 712 | if (in_mips_stubs_section (pc)) |
| 713 | return 1; |
| 714 | |
| 715 | read_memory (pc - 12, buf, 28); |
| 716 | |
| 717 | if (n64) |
| 718 | { |
| 719 | /* ld t9,0x8010(gp) */ |
| 720 | insn1 = 0xdf998010; |
| 721 | } |
| 722 | else |
| 723 | { |
| 724 | /* lw t9,0x8010(gp) */ |
| 725 | insn1 = 0x8f998010; |
| 726 | } |
| 727 | |
| 728 | p = buf + 12; |
| 729 | while (p >= buf) |
| 730 | { |
| 731 | insn = extract_unsigned_integer (p, 4, byte_order); |
| 732 | if (insn == insn1) |
| 733 | break; |
| 734 | p -= 4; |
| 735 | } |
| 736 | if (p < buf) |
| 737 | return 0; |
| 738 | |
| 739 | insn = extract_unsigned_integer (p + 4, 4, byte_order); |
| 740 | if (n64) |
| 741 | { |
| 742 | /* 'daddu t7,ra' or 'or t7, ra, zero'*/ |
| 743 | if (insn != 0x03e0782d || insn != 0x03e07825) |
| 744 | return 0; |
| 745 | |
| 746 | } |
| 747 | else |
| 748 | { |
| 749 | /* 'addu t7,ra' or 'or t7, ra, zero'*/ |
| 750 | if (insn != 0x03e07821 || insn != 0x03e07825) |
| 751 | return 0; |
| 752 | |
| 753 | } |
| 754 | |
| 755 | insn = extract_unsigned_integer (p + 8, 4, byte_order); |
| 756 | /* jalr t9,ra */ |
| 757 | if (insn != 0x0320f809) |
| 758 | return 0; |
| 759 | |
| 760 | insn = extract_unsigned_integer (p + 12, 4, byte_order); |
| 761 | if (n64) |
| 762 | { |
| 763 | /* daddiu t8,zero,0 */ |
| 764 | if ((insn & 0xffff0000) != 0x64180000) |
| 765 | return 0; |
| 766 | } |
| 767 | else |
| 768 | { |
| 769 | /* addiu t8,zero,0 */ |
| 770 | if ((insn & 0xffff0000) != 0x24180000) |
| 771 | return 0; |
| 772 | } |
| 773 | |
| 774 | return 1; |
| 775 | } |
| 776 | |
| 777 | /* Return non-zero iff PC belongs to the dynamic linker resolution |
| 778 | code, a PLT entry, or a lazy binding stub. */ |
| 779 | |
| 780 | static int |
| 781 | mips_linux_in_dynsym_resolve_code (CORE_ADDR pc) |
| 782 | { |
| 783 | /* Check whether PC is in the dynamic linker. This also checks |
| 784 | whether it is in the .plt section, used by non-PIC executables. */ |
| 785 | if (svr4_in_dynsym_resolve_code (pc)) |
| 786 | return 1; |
| 787 | |
| 788 | /* Likewise for the stubs. They live in the .MIPS.stubs section these |
| 789 | days, so we check if the PC is within, than fall back to a pattern |
| 790 | match. */ |
| 791 | if (mips_linux_in_dynsym_stub (pc)) |
| 792 | return 1; |
| 793 | |
| 794 | return 0; |
| 795 | } |
| 796 | |
| 797 | /* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c, |
| 798 | and glibc_skip_solib_resolver in glibc-tdep.c. The normal glibc |
| 799 | implementation of this triggers at "fixup" from the same objfile as |
| 800 | "_dl_runtime_resolve"; MIPS GNU/Linux can trigger at |
| 801 | "__dl_runtime_resolve" directly. An unresolved lazy binding |
| 802 | stub will point to _dl_runtime_resolve, which will first call |
| 803 | __dl_runtime_resolve, and then pass control to the resolved |
| 804 | function. */ |
| 805 | |
| 806 | static CORE_ADDR |
| 807 | mips_linux_skip_resolver (struct gdbarch *gdbarch, CORE_ADDR pc) |
| 808 | { |
| 809 | struct bound_minimal_symbol resolver; |
| 810 | |
| 811 | resolver = lookup_minimal_symbol ("__dl_runtime_resolve", NULL, NULL); |
| 812 | |
| 813 | if (resolver.minsym && BMSYMBOL_VALUE_ADDRESS (resolver) == pc) |
| 814 | return frame_unwind_caller_pc (get_current_frame ()); |
| 815 | |
| 816 | return glibc_skip_solib_resolver (gdbarch, pc); |
| 817 | } |
| 818 | |
| 819 | /* Signal trampoline support. There are four supported layouts for a |
| 820 | signal frame: o32 sigframe, o32 rt_sigframe, n32 rt_sigframe, and |
| 821 | n64 rt_sigframe. We handle them all independently; not the most |
| 822 | efficient way, but simplest. First, declare all the unwinders. */ |
| 823 | |
| 824 | static void mips_linux_o32_sigframe_init (const struct tramp_frame *self, |
| 825 | struct frame_info *this_frame, |
| 826 | struct trad_frame_cache *this_cache, |
| 827 | CORE_ADDR func); |
| 828 | |
| 829 | static void mips_linux_n32n64_sigframe_init (const struct tramp_frame *self, |
| 830 | struct frame_info *this_frame, |
| 831 | struct trad_frame_cache *this_cache, |
| 832 | CORE_ADDR func); |
| 833 | |
| 834 | static int mips_linux_sigframe_validate (const struct tramp_frame *self, |
| 835 | struct frame_info *this_frame, |
| 836 | CORE_ADDR *pc); |
| 837 | |
| 838 | static int micromips_linux_sigframe_validate (const struct tramp_frame *self, |
| 839 | struct frame_info *this_frame, |
| 840 | CORE_ADDR *pc); |
| 841 | |
| 842 | #define MIPS_NR_LINUX 4000 |
| 843 | #define MIPS_NR_N64_LINUX 5000 |
| 844 | #define MIPS_NR_N32_LINUX 6000 |
| 845 | |
| 846 | #define MIPS_NR_sigreturn MIPS_NR_LINUX + 119 |
| 847 | #define MIPS_NR_rt_sigreturn MIPS_NR_LINUX + 193 |
| 848 | #define MIPS_NR_N64_rt_sigreturn MIPS_NR_N64_LINUX + 211 |
| 849 | #define MIPS_NR_N32_rt_sigreturn MIPS_NR_N32_LINUX + 211 |
| 850 | |
| 851 | #define MIPS_INST_LI_V0_SIGRETURN 0x24020000 + MIPS_NR_sigreturn |
| 852 | #define MIPS_INST_LI_V0_RT_SIGRETURN 0x24020000 + MIPS_NR_rt_sigreturn |
| 853 | #define MIPS_INST_LI_V0_N64_RT_SIGRETURN 0x24020000 + MIPS_NR_N64_rt_sigreturn |
| 854 | #define MIPS_INST_LI_V0_N32_RT_SIGRETURN 0x24020000 + MIPS_NR_N32_rt_sigreturn |
| 855 | #define MIPS_INST_SYSCALL 0x0000000c |
| 856 | |
| 857 | #define MICROMIPS_INST_LI_V0 0x3040 |
| 858 | #define MICROMIPS_INST_POOL32A 0x0000 |
| 859 | #define MICROMIPS_INST_SYSCALL 0x8b7c |
| 860 | |
| 861 | static const struct tramp_frame mips_linux_o32_sigframe = { |
| 862 | SIGTRAMP_FRAME, |
| 863 | 4, |
| 864 | { |
| 865 | { MIPS_INST_LI_V0_SIGRETURN, -1 }, |
| 866 | { MIPS_INST_SYSCALL, -1 }, |
| 867 | { TRAMP_SENTINEL_INSN, -1 } |
| 868 | }, |
| 869 | mips_linux_o32_sigframe_init, |
| 870 | mips_linux_sigframe_validate |
| 871 | }; |
| 872 | |
| 873 | static const struct tramp_frame mips_linux_o32_rt_sigframe = { |
| 874 | SIGTRAMP_FRAME, |
| 875 | 4, |
| 876 | { |
| 877 | { MIPS_INST_LI_V0_RT_SIGRETURN, -1 }, |
| 878 | { MIPS_INST_SYSCALL, -1 }, |
| 879 | { TRAMP_SENTINEL_INSN, -1 } }, |
| 880 | mips_linux_o32_sigframe_init, |
| 881 | mips_linux_sigframe_validate |
| 882 | }; |
| 883 | |
| 884 | static const struct tramp_frame mips_linux_n32_rt_sigframe = { |
| 885 | SIGTRAMP_FRAME, |
| 886 | 4, |
| 887 | { |
| 888 | { MIPS_INST_LI_V0_N32_RT_SIGRETURN, -1 }, |
| 889 | { MIPS_INST_SYSCALL, -1 }, |
| 890 | { TRAMP_SENTINEL_INSN, -1 } |
| 891 | }, |
| 892 | mips_linux_n32n64_sigframe_init, |
| 893 | mips_linux_sigframe_validate |
| 894 | }; |
| 895 | |
| 896 | static const struct tramp_frame mips_linux_n64_rt_sigframe = { |
| 897 | SIGTRAMP_FRAME, |
| 898 | 4, |
| 899 | { |
| 900 | { MIPS_INST_LI_V0_N64_RT_SIGRETURN, -1 }, |
| 901 | { MIPS_INST_SYSCALL, -1 }, |
| 902 | { TRAMP_SENTINEL_INSN, -1 } |
| 903 | }, |
| 904 | mips_linux_n32n64_sigframe_init, |
| 905 | mips_linux_sigframe_validate |
| 906 | }; |
| 907 | |
| 908 | static const struct tramp_frame micromips_linux_o32_sigframe = { |
| 909 | SIGTRAMP_FRAME, |
| 910 | 2, |
| 911 | { |
| 912 | { MICROMIPS_INST_LI_V0, -1 }, |
| 913 | { MIPS_NR_sigreturn, -1 }, |
| 914 | { MICROMIPS_INST_POOL32A, -1 }, |
| 915 | { MICROMIPS_INST_SYSCALL, -1 }, |
| 916 | { TRAMP_SENTINEL_INSN, -1 } |
| 917 | }, |
| 918 | mips_linux_o32_sigframe_init, |
| 919 | micromips_linux_sigframe_validate |
| 920 | }; |
| 921 | |
| 922 | static const struct tramp_frame micromips_linux_o32_rt_sigframe = { |
| 923 | SIGTRAMP_FRAME, |
| 924 | 2, |
| 925 | { |
| 926 | { MICROMIPS_INST_LI_V0, -1 }, |
| 927 | { MIPS_NR_rt_sigreturn, -1 }, |
| 928 | { MICROMIPS_INST_POOL32A, -1 }, |
| 929 | { MICROMIPS_INST_SYSCALL, -1 }, |
| 930 | { TRAMP_SENTINEL_INSN, -1 } |
| 931 | }, |
| 932 | mips_linux_o32_sigframe_init, |
| 933 | micromips_linux_sigframe_validate |
| 934 | }; |
| 935 | |
| 936 | static const struct tramp_frame micromips_linux_n32_rt_sigframe = { |
| 937 | SIGTRAMP_FRAME, |
| 938 | 2, |
| 939 | { |
| 940 | { MICROMIPS_INST_LI_V0, -1 }, |
| 941 | { MIPS_NR_N32_rt_sigreturn, -1 }, |
| 942 | { MICROMIPS_INST_POOL32A, -1 }, |
| 943 | { MICROMIPS_INST_SYSCALL, -1 }, |
| 944 | { TRAMP_SENTINEL_INSN, -1 } |
| 945 | }, |
| 946 | mips_linux_n32n64_sigframe_init, |
| 947 | micromips_linux_sigframe_validate |
| 948 | }; |
| 949 | |
| 950 | static const struct tramp_frame micromips_linux_n64_rt_sigframe = { |
| 951 | SIGTRAMP_FRAME, |
| 952 | 2, |
| 953 | { |
| 954 | { MICROMIPS_INST_LI_V0, -1 }, |
| 955 | { MIPS_NR_N64_rt_sigreturn, -1 }, |
| 956 | { MICROMIPS_INST_POOL32A, -1 }, |
| 957 | { MICROMIPS_INST_SYSCALL, -1 }, |
| 958 | { TRAMP_SENTINEL_INSN, -1 } |
| 959 | }, |
| 960 | mips_linux_n32n64_sigframe_init, |
| 961 | micromips_linux_sigframe_validate |
| 962 | }; |
| 963 | |
| 964 | /* *INDENT-OFF* */ |
| 965 | /* The unwinder for o32 signal frames. The legacy structures look |
| 966 | like this: |
| 967 | |
| 968 | struct sigframe { |
| 969 | u32 sf_ass[4]; [argument save space for o32] |
| 970 | u32 sf_code[2]; [signal trampoline or fill] |
| 971 | struct sigcontext sf_sc; |
| 972 | sigset_t sf_mask; |
| 973 | }; |
| 974 | |
| 975 | Pre-2.6.12 sigcontext: |
| 976 | |
| 977 | struct sigcontext { |
| 978 | unsigned int sc_regmask; [Unused] |
| 979 | unsigned int sc_status; |
| 980 | unsigned long long sc_pc; |
| 981 | unsigned long long sc_regs[32]; |
| 982 | unsigned long long sc_fpregs[32]; |
| 983 | unsigned int sc_ownedfp; |
| 984 | unsigned int sc_fpc_csr; |
| 985 | unsigned int sc_fpc_eir; [Unused] |
| 986 | unsigned int sc_used_math; |
| 987 | unsigned int sc_ssflags; [Unused] |
| 988 | [Alignment hole of four bytes] |
| 989 | unsigned long long sc_mdhi; |
| 990 | unsigned long long sc_mdlo; |
| 991 | |
| 992 | unsigned int sc_cause; [Unused] |
| 993 | unsigned int sc_badvaddr; [Unused] |
| 994 | |
| 995 | unsigned long sc_sigset[4]; [kernel's sigset_t] |
| 996 | }; |
| 997 | |
| 998 | Post-2.6.12 sigcontext (SmartMIPS/DSP support added): |
| 999 | |
| 1000 | struct sigcontext { |
| 1001 | unsigned int sc_regmask; [Unused] |
| 1002 | unsigned int sc_status; [Unused] |
| 1003 | unsigned long long sc_pc; |
| 1004 | unsigned long long sc_regs[32]; |
| 1005 | unsigned long long sc_fpregs[32]; |
| 1006 | unsigned int sc_acx; |
| 1007 | unsigned int sc_fpc_csr; |
| 1008 | unsigned int sc_fpc_eir; [Unused] |
| 1009 | unsigned int sc_used_math; |
| 1010 | unsigned int sc_dsp; |
| 1011 | [Alignment hole of four bytes] |
| 1012 | unsigned long long sc_mdhi; |
| 1013 | unsigned long long sc_mdlo; |
| 1014 | unsigned long sc_hi1; |
| 1015 | unsigned long sc_lo1; |
| 1016 | unsigned long sc_hi2; |
| 1017 | unsigned long sc_lo2; |
| 1018 | unsigned long sc_hi3; |
| 1019 | unsigned long sc_lo3; |
| 1020 | }; |
| 1021 | |
| 1022 | The RT signal frames look like this: |
| 1023 | |
| 1024 | struct rt_sigframe { |
| 1025 | u32 rs_ass[4]; [argument save space for o32] |
| 1026 | u32 rs_code[2] [signal trampoline or fill] |
| 1027 | struct siginfo rs_info; |
| 1028 | struct ucontext rs_uc; |
| 1029 | }; |
| 1030 | |
| 1031 | struct ucontext { |
| 1032 | unsigned long uc_flags; |
| 1033 | struct ucontext *uc_link; |
| 1034 | stack_t uc_stack; |
| 1035 | [Alignment hole of four bytes] |
| 1036 | struct sigcontext uc_mcontext; |
| 1037 | sigset_t uc_sigmask; |
| 1038 | }; */ |
| 1039 | /* *INDENT-ON* */ |
| 1040 | |
| 1041 | #define SIGFRAME_SIGCONTEXT_OFFSET (6 * 4) |
| 1042 | |
| 1043 | #define RTSIGFRAME_SIGINFO_SIZE 128 |
| 1044 | #define STACK_T_SIZE (3 * 4) |
| 1045 | #define UCONTEXT_SIGCONTEXT_OFFSET (2 * 4 + STACK_T_SIZE + 4) |
| 1046 | #define RTSIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \ |
| 1047 | + RTSIGFRAME_SIGINFO_SIZE \ |
| 1048 | + UCONTEXT_SIGCONTEXT_OFFSET) |
| 1049 | |
| 1050 | #define SIGCONTEXT_PC (1 * 8) |
| 1051 | #define SIGCONTEXT_REGS (2 * 8) |
| 1052 | #define SIGCONTEXT_FPREGS (34 * 8) |
| 1053 | #define SIGCONTEXT_FPCSR (66 * 8 + 4) |
| 1054 | #define SIGCONTEXT_DSPCTL (68 * 8 + 0) |
| 1055 | #define SIGCONTEXT_HI (69 * 8) |
| 1056 | #define SIGCONTEXT_LO (70 * 8) |
| 1057 | #define SIGCONTEXT_CAUSE (71 * 8 + 0) |
| 1058 | #define SIGCONTEXT_BADVADDR (71 * 8 + 4) |
| 1059 | #define SIGCONTEXT_HI1 (71 * 8 + 0) |
| 1060 | #define SIGCONTEXT_LO1 (71 * 8 + 4) |
| 1061 | #define SIGCONTEXT_HI2 (72 * 8 + 0) |
| 1062 | #define SIGCONTEXT_LO2 (72 * 8 + 4) |
| 1063 | #define SIGCONTEXT_HI3 (73 * 8 + 0) |
| 1064 | #define SIGCONTEXT_LO3 (73 * 8 + 4) |
| 1065 | |
| 1066 | #define SIGCONTEXT_REG_SIZE 8 |
| 1067 | |
| 1068 | static void |
| 1069 | mips_linux_o32_sigframe_init (const struct tramp_frame *self, |
| 1070 | struct frame_info *this_frame, |
| 1071 | struct trad_frame_cache *this_cache, |
| 1072 | CORE_ADDR func) |
| 1073 | { |
| 1074 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 1075 | int ireg; |
| 1076 | CORE_ADDR frame_sp = get_frame_sp (this_frame); |
| 1077 | CORE_ADDR sigcontext_base; |
| 1078 | const struct mips_regnum *regs = mips_regnum (gdbarch); |
| 1079 | CORE_ADDR regs_base; |
| 1080 | |
| 1081 | if (self == &mips_linux_o32_sigframe |
| 1082 | || self == µmips_linux_o32_sigframe) |
| 1083 | sigcontext_base = frame_sp + SIGFRAME_SIGCONTEXT_OFFSET; |
| 1084 | else |
| 1085 | sigcontext_base = frame_sp + RTSIGFRAME_SIGCONTEXT_OFFSET; |
| 1086 | |
| 1087 | /* I'm not proud of this hack. Eventually we will have the |
| 1088 | infrastructure to indicate the size of saved registers on a |
| 1089 | per-frame basis, but right now we don't; the kernel saves eight |
| 1090 | bytes but we only want four. Use regs_base to access any |
| 1091 | 64-bit fields. */ |
| 1092 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 1093 | regs_base = sigcontext_base + 4; |
| 1094 | else |
| 1095 | regs_base = sigcontext_base; |
| 1096 | |
| 1097 | if (mips_linux_restart_reg_p (gdbarch)) |
| 1098 | trad_frame_set_reg_addr (this_cache, |
| 1099 | (MIPS_RESTART_REGNUM |
| 1100 | + gdbarch_num_regs (gdbarch)), |
| 1101 | regs_base + SIGCONTEXT_REGS); |
| 1102 | |
| 1103 | for (ireg = 1; ireg < 32; ireg++) |
| 1104 | trad_frame_set_reg_addr (this_cache, |
| 1105 | (ireg + MIPS_ZERO_REGNUM |
| 1106 | + gdbarch_num_regs (gdbarch)), |
| 1107 | (regs_base + SIGCONTEXT_REGS |
| 1108 | + ireg * SIGCONTEXT_REG_SIZE)); |
| 1109 | |
| 1110 | /* The way that floating point registers are saved, unfortunately, |
| 1111 | depends on the architecture the kernel is built for. For the r3000 and |
| 1112 | tx39, four bytes of each register are at the beginning of each of the |
| 1113 | 32 eight byte slots. For everything else, the registers are saved |
| 1114 | using double precision; only the even-numbered slots are initialized, |
| 1115 | and the high bits are the odd-numbered register. Assume the latter |
| 1116 | layout, since we can't tell, and it's much more common. Which bits are |
| 1117 | the "high" bits depends on endianness. */ |
| 1118 | for (ireg = 0; ireg < 32; ireg++) |
| 1119 | if ((gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) != (ireg & 1)) |
| 1120 | trad_frame_set_reg_addr (this_cache, |
| 1121 | ireg + regs->fp0 + gdbarch_num_regs (gdbarch), |
| 1122 | (sigcontext_base + SIGCONTEXT_FPREGS + 4 |
| 1123 | + (ireg & ~1) * SIGCONTEXT_REG_SIZE)); |
| 1124 | else |
| 1125 | trad_frame_set_reg_addr (this_cache, |
| 1126 | ireg + regs->fp0 + gdbarch_num_regs (gdbarch), |
| 1127 | (sigcontext_base + SIGCONTEXT_FPREGS |
| 1128 | + (ireg & ~1) * SIGCONTEXT_REG_SIZE)); |
| 1129 | |
| 1130 | trad_frame_set_reg_addr (this_cache, |
| 1131 | regs->pc + gdbarch_num_regs (gdbarch), |
| 1132 | regs_base + SIGCONTEXT_PC); |
| 1133 | |
| 1134 | trad_frame_set_reg_addr (this_cache, |
| 1135 | (regs->fp_control_status |
| 1136 | + gdbarch_num_regs (gdbarch)), |
| 1137 | sigcontext_base + SIGCONTEXT_FPCSR); |
| 1138 | |
| 1139 | if (regs->dspctl != -1) |
| 1140 | trad_frame_set_reg_addr (this_cache, |
| 1141 | regs->dspctl + gdbarch_num_regs (gdbarch), |
| 1142 | sigcontext_base + SIGCONTEXT_DSPCTL); |
| 1143 | |
| 1144 | trad_frame_set_reg_addr (this_cache, |
| 1145 | regs->hi + gdbarch_num_regs (gdbarch), |
| 1146 | regs_base + SIGCONTEXT_HI); |
| 1147 | trad_frame_set_reg_addr (this_cache, |
| 1148 | regs->lo + gdbarch_num_regs (gdbarch), |
| 1149 | regs_base + SIGCONTEXT_LO); |
| 1150 | |
| 1151 | if (regs->dspacc != -1) |
| 1152 | { |
| 1153 | trad_frame_set_reg_addr (this_cache, |
| 1154 | regs->dspacc + 0 + gdbarch_num_regs (gdbarch), |
| 1155 | sigcontext_base + SIGCONTEXT_HI1); |
| 1156 | trad_frame_set_reg_addr (this_cache, |
| 1157 | regs->dspacc + 1 + gdbarch_num_regs (gdbarch), |
| 1158 | sigcontext_base + SIGCONTEXT_LO1); |
| 1159 | trad_frame_set_reg_addr (this_cache, |
| 1160 | regs->dspacc + 2 + gdbarch_num_regs (gdbarch), |
| 1161 | sigcontext_base + SIGCONTEXT_HI2); |
| 1162 | trad_frame_set_reg_addr (this_cache, |
| 1163 | regs->dspacc + 3 + gdbarch_num_regs (gdbarch), |
| 1164 | sigcontext_base + SIGCONTEXT_LO2); |
| 1165 | trad_frame_set_reg_addr (this_cache, |
| 1166 | regs->dspacc + 4 + gdbarch_num_regs (gdbarch), |
| 1167 | sigcontext_base + SIGCONTEXT_HI3); |
| 1168 | trad_frame_set_reg_addr (this_cache, |
| 1169 | regs->dspacc + 5 + gdbarch_num_regs (gdbarch), |
| 1170 | sigcontext_base + SIGCONTEXT_LO3); |
| 1171 | } |
| 1172 | else |
| 1173 | { |
| 1174 | trad_frame_set_reg_addr (this_cache, |
| 1175 | regs->cause + gdbarch_num_regs (gdbarch), |
| 1176 | sigcontext_base + SIGCONTEXT_CAUSE); |
| 1177 | trad_frame_set_reg_addr (this_cache, |
| 1178 | regs->badvaddr + gdbarch_num_regs (gdbarch), |
| 1179 | sigcontext_base + SIGCONTEXT_BADVADDR); |
| 1180 | } |
| 1181 | |
| 1182 | /* Choice of the bottom of the sigframe is somewhat arbitrary. */ |
| 1183 | trad_frame_set_id (this_cache, frame_id_build (frame_sp, func)); |
| 1184 | } |
| 1185 | |
| 1186 | /* *INDENT-OFF* */ |
| 1187 | /* For N32/N64 things look different. There is no non-rt signal frame. |
| 1188 | |
| 1189 | struct rt_sigframe_n32 { |
| 1190 | u32 rs_ass[4]; [ argument save space for o32 ] |
| 1191 | u32 rs_code[2]; [ signal trampoline or fill ] |
| 1192 | struct siginfo rs_info; |
| 1193 | struct ucontextn32 rs_uc; |
| 1194 | }; |
| 1195 | |
| 1196 | struct ucontextn32 { |
| 1197 | u32 uc_flags; |
| 1198 | s32 uc_link; |
| 1199 | stack32_t uc_stack; |
| 1200 | struct sigcontext uc_mcontext; |
| 1201 | sigset_t uc_sigmask; [ mask last for extensibility ] |
| 1202 | }; |
| 1203 | |
| 1204 | struct rt_sigframe { |
| 1205 | u32 rs_ass[4]; [ argument save space for o32 ] |
| 1206 | u32 rs_code[2]; [ signal trampoline ] |
| 1207 | struct siginfo rs_info; |
| 1208 | struct ucontext rs_uc; |
| 1209 | }; |
| 1210 | |
| 1211 | struct ucontext { |
| 1212 | unsigned long uc_flags; |
| 1213 | struct ucontext *uc_link; |
| 1214 | stack_t uc_stack; |
| 1215 | struct sigcontext uc_mcontext; |
| 1216 | sigset_t uc_sigmask; [ mask last for extensibility ] |
| 1217 | }; |
| 1218 | |
| 1219 | And the sigcontext is different (this is for both n32 and n64): |
| 1220 | |
| 1221 | struct sigcontext { |
| 1222 | unsigned long long sc_regs[32]; |
| 1223 | unsigned long long sc_fpregs[32]; |
| 1224 | unsigned long long sc_mdhi; |
| 1225 | unsigned long long sc_hi1; |
| 1226 | unsigned long long sc_hi2; |
| 1227 | unsigned long long sc_hi3; |
| 1228 | unsigned long long sc_mdlo; |
| 1229 | unsigned long long sc_lo1; |
| 1230 | unsigned long long sc_lo2; |
| 1231 | unsigned long long sc_lo3; |
| 1232 | unsigned long long sc_pc; |
| 1233 | unsigned int sc_fpc_csr; |
| 1234 | unsigned int sc_used_math; |
| 1235 | unsigned int sc_dsp; |
| 1236 | unsigned int sc_reserved; |
| 1237 | }; |
| 1238 | |
| 1239 | That is the post-2.6.12 definition of the 64-bit sigcontext; before |
| 1240 | then, there were no hi1-hi3 or lo1-lo3. Cause and badvaddr were |
| 1241 | included too. */ |
| 1242 | /* *INDENT-ON* */ |
| 1243 | |
| 1244 | #define N32_STACK_T_SIZE STACK_T_SIZE |
| 1245 | #define N64_STACK_T_SIZE (2 * 8 + 4) |
| 1246 | #define N32_UCONTEXT_SIGCONTEXT_OFFSET (2 * 4 + N32_STACK_T_SIZE + 4) |
| 1247 | #define N64_UCONTEXT_SIGCONTEXT_OFFSET (2 * 8 + N64_STACK_T_SIZE + 4) |
| 1248 | #define N32_SIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \ |
| 1249 | + RTSIGFRAME_SIGINFO_SIZE \ |
| 1250 | + N32_UCONTEXT_SIGCONTEXT_OFFSET) |
| 1251 | #define N64_SIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \ |
| 1252 | + RTSIGFRAME_SIGINFO_SIZE \ |
| 1253 | + N64_UCONTEXT_SIGCONTEXT_OFFSET) |
| 1254 | |
| 1255 | #define N64_SIGCONTEXT_REGS (0 * 8) |
| 1256 | #define N64_SIGCONTEXT_FPREGS (32 * 8) |
| 1257 | #define N64_SIGCONTEXT_HI (64 * 8) |
| 1258 | #define N64_SIGCONTEXT_HI1 (65 * 8) |
| 1259 | #define N64_SIGCONTEXT_HI2 (66 * 8) |
| 1260 | #define N64_SIGCONTEXT_HI3 (67 * 8) |
| 1261 | #define N64_SIGCONTEXT_LO (68 * 8) |
| 1262 | #define N64_SIGCONTEXT_LO1 (69 * 8) |
| 1263 | #define N64_SIGCONTEXT_LO2 (70 * 8) |
| 1264 | #define N64_SIGCONTEXT_LO3 (71 * 8) |
| 1265 | #define N64_SIGCONTEXT_PC (72 * 8) |
| 1266 | #define N64_SIGCONTEXT_FPCSR (73 * 8 + 0) |
| 1267 | #define N64_SIGCONTEXT_DSPCTL (74 * 8 + 0) |
| 1268 | |
| 1269 | #define N64_SIGCONTEXT_REG_SIZE 8 |
| 1270 | |
| 1271 | static void |
| 1272 | mips_linux_n32n64_sigframe_init (const struct tramp_frame *self, |
| 1273 | struct frame_info *this_frame, |
| 1274 | struct trad_frame_cache *this_cache, |
| 1275 | CORE_ADDR func) |
| 1276 | { |
| 1277 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
| 1278 | int ireg; |
| 1279 | CORE_ADDR frame_sp = get_frame_sp (this_frame); |
| 1280 | CORE_ADDR sigcontext_base; |
| 1281 | const struct mips_regnum *regs = mips_regnum (gdbarch); |
| 1282 | |
| 1283 | if (self == &mips_linux_n32_rt_sigframe |
| 1284 | || self == µmips_linux_n32_rt_sigframe) |
| 1285 | sigcontext_base = frame_sp + N32_SIGFRAME_SIGCONTEXT_OFFSET; |
| 1286 | else |
| 1287 | sigcontext_base = frame_sp + N64_SIGFRAME_SIGCONTEXT_OFFSET; |
| 1288 | |
| 1289 | if (mips_linux_restart_reg_p (gdbarch)) |
| 1290 | trad_frame_set_reg_addr (this_cache, |
| 1291 | (MIPS_RESTART_REGNUM |
| 1292 | + gdbarch_num_regs (gdbarch)), |
| 1293 | sigcontext_base + N64_SIGCONTEXT_REGS); |
| 1294 | |
| 1295 | for (ireg = 1; ireg < 32; ireg++) |
| 1296 | trad_frame_set_reg_addr (this_cache, |
| 1297 | (ireg + MIPS_ZERO_REGNUM |
| 1298 | + gdbarch_num_regs (gdbarch)), |
| 1299 | (sigcontext_base + N64_SIGCONTEXT_REGS |
| 1300 | + ireg * N64_SIGCONTEXT_REG_SIZE)); |
| 1301 | |
| 1302 | for (ireg = 0; ireg < 32; ireg++) |
| 1303 | trad_frame_set_reg_addr (this_cache, |
| 1304 | ireg + regs->fp0 + gdbarch_num_regs (gdbarch), |
| 1305 | (sigcontext_base + N64_SIGCONTEXT_FPREGS |
| 1306 | + ireg * N64_SIGCONTEXT_REG_SIZE)); |
| 1307 | |
| 1308 | trad_frame_set_reg_addr (this_cache, |
| 1309 | regs->pc + gdbarch_num_regs (gdbarch), |
| 1310 | sigcontext_base + N64_SIGCONTEXT_PC); |
| 1311 | |
| 1312 | trad_frame_set_reg_addr (this_cache, |
| 1313 | (regs->fp_control_status |
| 1314 | + gdbarch_num_regs (gdbarch)), |
| 1315 | sigcontext_base + N64_SIGCONTEXT_FPCSR); |
| 1316 | |
| 1317 | trad_frame_set_reg_addr (this_cache, |
| 1318 | regs->hi + gdbarch_num_regs (gdbarch), |
| 1319 | sigcontext_base + N64_SIGCONTEXT_HI); |
| 1320 | trad_frame_set_reg_addr (this_cache, |
| 1321 | regs->lo + gdbarch_num_regs (gdbarch), |
| 1322 | sigcontext_base + N64_SIGCONTEXT_LO); |
| 1323 | |
| 1324 | if (regs->dspacc != -1) |
| 1325 | { |
| 1326 | trad_frame_set_reg_addr (this_cache, |
| 1327 | regs->dspacc + 0 + gdbarch_num_regs (gdbarch), |
| 1328 | sigcontext_base + N64_SIGCONTEXT_HI1); |
| 1329 | trad_frame_set_reg_addr (this_cache, |
| 1330 | regs->dspacc + 1 + gdbarch_num_regs (gdbarch), |
| 1331 | sigcontext_base + N64_SIGCONTEXT_LO1); |
| 1332 | trad_frame_set_reg_addr (this_cache, |
| 1333 | regs->dspacc + 2 + gdbarch_num_regs (gdbarch), |
| 1334 | sigcontext_base + N64_SIGCONTEXT_HI2); |
| 1335 | trad_frame_set_reg_addr (this_cache, |
| 1336 | regs->dspacc + 3 + gdbarch_num_regs (gdbarch), |
| 1337 | sigcontext_base + N64_SIGCONTEXT_LO2); |
| 1338 | trad_frame_set_reg_addr (this_cache, |
| 1339 | regs->dspacc + 4 + gdbarch_num_regs (gdbarch), |
| 1340 | sigcontext_base + N64_SIGCONTEXT_HI3); |
| 1341 | trad_frame_set_reg_addr (this_cache, |
| 1342 | regs->dspacc + 5 + gdbarch_num_regs (gdbarch), |
| 1343 | sigcontext_base + N64_SIGCONTEXT_LO3); |
| 1344 | } |
| 1345 | if (regs->dspctl != -1) |
| 1346 | trad_frame_set_reg_addr (this_cache, |
| 1347 | regs->dspctl + gdbarch_num_regs (gdbarch), |
| 1348 | sigcontext_base + N64_SIGCONTEXT_DSPCTL); |
| 1349 | |
| 1350 | /* Choice of the bottom of the sigframe is somewhat arbitrary. */ |
| 1351 | trad_frame_set_id (this_cache, frame_id_build (frame_sp, func)); |
| 1352 | } |
| 1353 | |
| 1354 | /* Implement struct tramp_frame's "validate" method for standard MIPS code. */ |
| 1355 | |
| 1356 | static int |
| 1357 | mips_linux_sigframe_validate (const struct tramp_frame *self, |
| 1358 | struct frame_info *this_frame, |
| 1359 | CORE_ADDR *pc) |
| 1360 | { |
| 1361 | return mips_pc_is_mips (*pc); |
| 1362 | } |
| 1363 | |
| 1364 | /* Implement struct tramp_frame's "validate" method for microMIPS code. */ |
| 1365 | |
| 1366 | static int |
| 1367 | micromips_linux_sigframe_validate (const struct tramp_frame *self, |
| 1368 | struct frame_info *this_frame, |
| 1369 | CORE_ADDR *pc) |
| 1370 | { |
| 1371 | if (mips_pc_is_micromips (get_frame_arch (this_frame), *pc)) |
| 1372 | { |
| 1373 | *pc = mips_unmake_compact_addr (*pc); |
| 1374 | return 1; |
| 1375 | } |
| 1376 | else |
| 1377 | return 0; |
| 1378 | } |
| 1379 | |
| 1380 | /* Implement the "write_pc" gdbarch method. */ |
| 1381 | |
| 1382 | static void |
| 1383 | mips_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) |
| 1384 | { |
| 1385 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 1386 | |
| 1387 | mips_write_pc (regcache, pc); |
| 1388 | |
| 1389 | /* Clear the syscall restart flag. */ |
| 1390 | if (mips_linux_restart_reg_p (gdbarch)) |
| 1391 | regcache_cooked_write_unsigned (regcache, MIPS_RESTART_REGNUM, 0); |
| 1392 | } |
| 1393 | |
| 1394 | /* Return 1 if MIPS_RESTART_REGNUM is usable. */ |
| 1395 | |
| 1396 | int |
| 1397 | mips_linux_restart_reg_p (struct gdbarch *gdbarch) |
| 1398 | { |
| 1399 | /* If we do not have a target description with registers, then |
| 1400 | MIPS_RESTART_REGNUM will not be included in the register set. */ |
| 1401 | if (!tdesc_has_registers (gdbarch_target_desc (gdbarch))) |
| 1402 | return 0; |
| 1403 | |
| 1404 | /* If we do, then MIPS_RESTART_REGNUM is safe to check; it will |
| 1405 | either be GPR-sized or missing. */ |
| 1406 | return register_size (gdbarch, MIPS_RESTART_REGNUM) > 0; |
| 1407 | } |
| 1408 | |
| 1409 | /* When FRAME is at a syscall instruction, return the PC of the next |
| 1410 | instruction to be executed. */ |
| 1411 | |
| 1412 | static CORE_ADDR |
| 1413 | mips_linux_syscall_next_pc (struct frame_info *frame) |
| 1414 | { |
| 1415 | CORE_ADDR pc = get_frame_pc (frame); |
| 1416 | ULONGEST v0 = get_frame_register_unsigned (frame, MIPS_V0_REGNUM); |
| 1417 | |
| 1418 | /* If we are about to make a sigreturn syscall, use the unwinder to |
| 1419 | decode the signal frame. */ |
| 1420 | if (v0 == MIPS_NR_sigreturn |
| 1421 | || v0 == MIPS_NR_rt_sigreturn |
| 1422 | || v0 == MIPS_NR_N64_rt_sigreturn |
| 1423 | || v0 == MIPS_NR_N32_rt_sigreturn) |
| 1424 | return frame_unwind_caller_pc (get_current_frame ()); |
| 1425 | |
| 1426 | return pc + 4; |
| 1427 | } |
| 1428 | |
| 1429 | /* Return the current system call's number present in the |
| 1430 | v0 register. When the function fails, it returns -1. */ |
| 1431 | |
| 1432 | static LONGEST |
| 1433 | mips_linux_get_syscall_number (struct gdbarch *gdbarch, |
| 1434 | ptid_t ptid) |
| 1435 | { |
| 1436 | struct regcache *regcache = get_thread_regcache (ptid); |
| 1437 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1438 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1439 | int regsize = register_size (gdbarch, MIPS_V0_REGNUM); |
| 1440 | /* The content of a register */ |
| 1441 | gdb_byte buf[8]; |
| 1442 | /* The result */ |
| 1443 | LONGEST ret; |
| 1444 | |
| 1445 | /* Make sure we're in a known ABI */ |
| 1446 | gdb_assert (tdep->mips_abi == MIPS_ABI_O32 |
| 1447 | || tdep->mips_abi == MIPS_ABI_N32 |
| 1448 | || tdep->mips_abi == MIPS_ABI_N64); |
| 1449 | |
| 1450 | gdb_assert (regsize <= sizeof (buf)); |
| 1451 | |
| 1452 | /* Getting the system call number from the register. |
| 1453 | syscall number is in v0 or $2. */ |
| 1454 | regcache_cooked_read (regcache, MIPS_V0_REGNUM, buf); |
| 1455 | |
| 1456 | ret = extract_signed_integer (buf, regsize, byte_order); |
| 1457 | |
| 1458 | return ret; |
| 1459 | } |
| 1460 | |
| 1461 | /* Implementation of `gdbarch_gdb_signal_to_target', as defined in |
| 1462 | gdbarch.h. */ |
| 1463 | |
| 1464 | static int |
| 1465 | mips_gdb_signal_to_target (struct gdbarch *gdbarch, |
| 1466 | enum gdb_signal signal) |
| 1467 | { |
| 1468 | switch (signal) |
| 1469 | { |
| 1470 | case GDB_SIGNAL_EMT: |
| 1471 | return MIPS_LINUX_SIGEMT; |
| 1472 | |
| 1473 | case GDB_SIGNAL_BUS: |
| 1474 | return MIPS_LINUX_SIGBUS; |
| 1475 | |
| 1476 | case GDB_SIGNAL_SYS: |
| 1477 | return MIPS_LINUX_SIGSYS; |
| 1478 | |
| 1479 | case GDB_SIGNAL_USR1: |
| 1480 | return MIPS_LINUX_SIGUSR1; |
| 1481 | |
| 1482 | case GDB_SIGNAL_USR2: |
| 1483 | return MIPS_LINUX_SIGUSR2; |
| 1484 | |
| 1485 | case GDB_SIGNAL_CHLD: |
| 1486 | return MIPS_LINUX_SIGCHLD; |
| 1487 | |
| 1488 | case GDB_SIGNAL_PWR: |
| 1489 | return MIPS_LINUX_SIGPWR; |
| 1490 | |
| 1491 | case GDB_SIGNAL_WINCH: |
| 1492 | return MIPS_LINUX_SIGWINCH; |
| 1493 | |
| 1494 | case GDB_SIGNAL_URG: |
| 1495 | return MIPS_LINUX_SIGURG; |
| 1496 | |
| 1497 | case GDB_SIGNAL_IO: |
| 1498 | return MIPS_LINUX_SIGIO; |
| 1499 | |
| 1500 | case GDB_SIGNAL_POLL: |
| 1501 | return MIPS_LINUX_SIGPOLL; |
| 1502 | |
| 1503 | case GDB_SIGNAL_STOP: |
| 1504 | return MIPS_LINUX_SIGSTOP; |
| 1505 | |
| 1506 | case GDB_SIGNAL_TSTP: |
| 1507 | return MIPS_LINUX_SIGTSTP; |
| 1508 | |
| 1509 | case GDB_SIGNAL_CONT: |
| 1510 | return MIPS_LINUX_SIGCONT; |
| 1511 | |
| 1512 | case GDB_SIGNAL_TTIN: |
| 1513 | return MIPS_LINUX_SIGTTIN; |
| 1514 | |
| 1515 | case GDB_SIGNAL_TTOU: |
| 1516 | return MIPS_LINUX_SIGTTOU; |
| 1517 | |
| 1518 | case GDB_SIGNAL_VTALRM: |
| 1519 | return MIPS_LINUX_SIGVTALRM; |
| 1520 | |
| 1521 | case GDB_SIGNAL_PROF: |
| 1522 | return MIPS_LINUX_SIGPROF; |
| 1523 | |
| 1524 | case GDB_SIGNAL_XCPU: |
| 1525 | return MIPS_LINUX_SIGXCPU; |
| 1526 | |
| 1527 | case GDB_SIGNAL_XFSZ: |
| 1528 | return MIPS_LINUX_SIGXFSZ; |
| 1529 | |
| 1530 | /* GDB_SIGNAL_REALTIME_32 is not continuous in <gdb/signals.def>, |
| 1531 | therefore we have to handle it here. */ |
| 1532 | case GDB_SIGNAL_REALTIME_32: |
| 1533 | return MIPS_LINUX_SIGRTMIN; |
| 1534 | } |
| 1535 | |
| 1536 | if (signal >= GDB_SIGNAL_REALTIME_33 |
| 1537 | && signal <= GDB_SIGNAL_REALTIME_63) |
| 1538 | { |
| 1539 | int offset = signal - GDB_SIGNAL_REALTIME_33; |
| 1540 | |
| 1541 | return MIPS_LINUX_SIGRTMIN + 1 + offset; |
| 1542 | } |
| 1543 | else if (signal >= GDB_SIGNAL_REALTIME_64 |
| 1544 | && signal <= GDB_SIGNAL_REALTIME_127) |
| 1545 | { |
| 1546 | int offset = signal - GDB_SIGNAL_REALTIME_64; |
| 1547 | |
| 1548 | return MIPS_LINUX_SIGRT64 + offset; |
| 1549 | } |
| 1550 | |
| 1551 | return linux_gdb_signal_to_target (gdbarch, signal); |
| 1552 | } |
| 1553 | |
| 1554 | /* Translate signals based on MIPS signal values. |
| 1555 | Adapted from gdb/common/signals.c. */ |
| 1556 | |
| 1557 | static enum gdb_signal |
| 1558 | mips_gdb_signal_from_target (struct gdbarch *gdbarch, int signal) |
| 1559 | { |
| 1560 | switch (signal) |
| 1561 | { |
| 1562 | case MIPS_LINUX_SIGEMT: |
| 1563 | return GDB_SIGNAL_EMT; |
| 1564 | |
| 1565 | case MIPS_LINUX_SIGBUS: |
| 1566 | return GDB_SIGNAL_BUS; |
| 1567 | |
| 1568 | case MIPS_LINUX_SIGSYS: |
| 1569 | return GDB_SIGNAL_SYS; |
| 1570 | |
| 1571 | case MIPS_LINUX_SIGUSR1: |
| 1572 | return GDB_SIGNAL_USR1; |
| 1573 | |
| 1574 | case MIPS_LINUX_SIGUSR2: |
| 1575 | return GDB_SIGNAL_USR2; |
| 1576 | |
| 1577 | case MIPS_LINUX_SIGCHLD: |
| 1578 | return GDB_SIGNAL_CHLD; |
| 1579 | |
| 1580 | case MIPS_LINUX_SIGPWR: |
| 1581 | return GDB_SIGNAL_PWR; |
| 1582 | |
| 1583 | case MIPS_LINUX_SIGWINCH: |
| 1584 | return GDB_SIGNAL_WINCH; |
| 1585 | |
| 1586 | case MIPS_LINUX_SIGURG: |
| 1587 | return GDB_SIGNAL_URG; |
| 1588 | |
| 1589 | /* No way to differentiate between SIGIO and SIGPOLL. |
| 1590 | Therefore, we just handle the first one. */ |
| 1591 | case MIPS_LINUX_SIGIO: |
| 1592 | return GDB_SIGNAL_IO; |
| 1593 | |
| 1594 | case MIPS_LINUX_SIGSTOP: |
| 1595 | return GDB_SIGNAL_STOP; |
| 1596 | |
| 1597 | case MIPS_LINUX_SIGTSTP: |
| 1598 | return GDB_SIGNAL_TSTP; |
| 1599 | |
| 1600 | case MIPS_LINUX_SIGCONT: |
| 1601 | return GDB_SIGNAL_CONT; |
| 1602 | |
| 1603 | case MIPS_LINUX_SIGTTIN: |
| 1604 | return GDB_SIGNAL_TTIN; |
| 1605 | |
| 1606 | case MIPS_LINUX_SIGTTOU: |
| 1607 | return GDB_SIGNAL_TTOU; |
| 1608 | |
| 1609 | case MIPS_LINUX_SIGVTALRM: |
| 1610 | return GDB_SIGNAL_VTALRM; |
| 1611 | |
| 1612 | case MIPS_LINUX_SIGPROF: |
| 1613 | return GDB_SIGNAL_PROF; |
| 1614 | |
| 1615 | case MIPS_LINUX_SIGXCPU: |
| 1616 | return GDB_SIGNAL_XCPU; |
| 1617 | |
| 1618 | case MIPS_LINUX_SIGXFSZ: |
| 1619 | return GDB_SIGNAL_XFSZ; |
| 1620 | } |
| 1621 | |
| 1622 | if (signal >= MIPS_LINUX_SIGRTMIN && signal <= MIPS_LINUX_SIGRTMAX) |
| 1623 | { |
| 1624 | /* GDB_SIGNAL_REALTIME values are not contiguous, map parts of |
| 1625 | the MIPS block to the respective GDB_SIGNAL_REALTIME blocks. */ |
| 1626 | int offset = signal - MIPS_LINUX_SIGRTMIN; |
| 1627 | |
| 1628 | if (offset == 0) |
| 1629 | return GDB_SIGNAL_REALTIME_32; |
| 1630 | else if (offset < 32) |
| 1631 | return (enum gdb_signal) (offset - 1 |
| 1632 | + (int) GDB_SIGNAL_REALTIME_33); |
| 1633 | else |
| 1634 | return (enum gdb_signal) (offset - 32 |
| 1635 | + (int) GDB_SIGNAL_REALTIME_64); |
| 1636 | } |
| 1637 | |
| 1638 | return linux_gdb_signal_from_target (gdbarch, signal); |
| 1639 | } |
| 1640 | |
| 1641 | /* Initialize one of the GNU/Linux OS ABIs. */ |
| 1642 | |
| 1643 | static void |
| 1644 | mips_linux_init_abi (struct gdbarch_info info, |
| 1645 | struct gdbarch *gdbarch) |
| 1646 | { |
| 1647 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1648 | enum mips_abi abi = mips_abi (gdbarch); |
| 1649 | struct tdesc_arch_data *tdesc_data |
| 1650 | = (struct tdesc_arch_data *) info.tdep_info; |
| 1651 | |
| 1652 | linux_init_abi (info, gdbarch); |
| 1653 | |
| 1654 | /* Get the syscall number from the arch's register. */ |
| 1655 | set_gdbarch_get_syscall_number (gdbarch, mips_linux_get_syscall_number); |
| 1656 | |
| 1657 | switch (abi) |
| 1658 | { |
| 1659 | case MIPS_ABI_O32: |
| 1660 | set_gdbarch_get_longjmp_target (gdbarch, |
| 1661 | mips_linux_get_longjmp_target); |
| 1662 | set_solib_svr4_fetch_link_map_offsets |
| 1663 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 1664 | tramp_frame_prepend_unwinder (gdbarch, µmips_linux_o32_sigframe); |
| 1665 | tramp_frame_prepend_unwinder (gdbarch, |
| 1666 | µmips_linux_o32_rt_sigframe); |
| 1667 | tramp_frame_prepend_unwinder (gdbarch, &mips_linux_o32_sigframe); |
| 1668 | tramp_frame_prepend_unwinder (gdbarch, &mips_linux_o32_rt_sigframe); |
| 1669 | set_xml_syscall_file_name (gdbarch, "syscalls/mips-o32-linux.xml"); |
| 1670 | break; |
| 1671 | case MIPS_ABI_N32: |
| 1672 | set_gdbarch_get_longjmp_target (gdbarch, |
| 1673 | mips_linux_get_longjmp_target); |
| 1674 | set_solib_svr4_fetch_link_map_offsets |
| 1675 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 1676 | set_gdbarch_long_double_bit (gdbarch, 128); |
| 1677 | /* These floatformats should probably be renamed. MIPS uses |
| 1678 | the same 128-bit IEEE floating point format that IA-64 uses, |
| 1679 | except that the quiet/signalling NaN bit is reversed (GDB |
| 1680 | does not distinguish between quiet and signalling NaNs). */ |
| 1681 | set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad); |
| 1682 | tramp_frame_prepend_unwinder (gdbarch, |
| 1683 | µmips_linux_n32_rt_sigframe); |
| 1684 | tramp_frame_prepend_unwinder (gdbarch, &mips_linux_n32_rt_sigframe); |
| 1685 | set_xml_syscall_file_name (gdbarch, "syscalls/mips-n32-linux.xml"); |
| 1686 | break; |
| 1687 | case MIPS_ABI_N64: |
| 1688 | set_gdbarch_get_longjmp_target (gdbarch, |
| 1689 | mips64_linux_get_longjmp_target); |
| 1690 | set_solib_svr4_fetch_link_map_offsets |
| 1691 | (gdbarch, svr4_lp64_fetch_link_map_offsets); |
| 1692 | set_gdbarch_long_double_bit (gdbarch, 128); |
| 1693 | /* These floatformats should probably be renamed. MIPS uses |
| 1694 | the same 128-bit IEEE floating point format that IA-64 uses, |
| 1695 | except that the quiet/signalling NaN bit is reversed (GDB |
| 1696 | does not distinguish between quiet and signalling NaNs). */ |
| 1697 | set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad); |
| 1698 | tramp_frame_prepend_unwinder (gdbarch, |
| 1699 | µmips_linux_n64_rt_sigframe); |
| 1700 | tramp_frame_prepend_unwinder (gdbarch, &mips_linux_n64_rt_sigframe); |
| 1701 | set_xml_syscall_file_name (gdbarch, "syscalls/mips-n64-linux.xml"); |
| 1702 | break; |
| 1703 | default: |
| 1704 | break; |
| 1705 | } |
| 1706 | |
| 1707 | set_gdbarch_skip_solib_resolver (gdbarch, mips_linux_skip_resolver); |
| 1708 | |
| 1709 | set_gdbarch_software_single_step (gdbarch, mips_software_single_step); |
| 1710 | |
| 1711 | /* Enable TLS support. */ |
| 1712 | set_gdbarch_fetch_tls_load_module_address (gdbarch, |
| 1713 | svr4_fetch_objfile_link_map); |
| 1714 | |
| 1715 | /* Initialize this lazily, to avoid an initialization order |
| 1716 | dependency on solib-svr4.c's _initialize routine. */ |
| 1717 | if (mips_svr4_so_ops.in_dynsym_resolve_code == NULL) |
| 1718 | { |
| 1719 | mips_svr4_so_ops = svr4_so_ops; |
| 1720 | mips_svr4_so_ops.in_dynsym_resolve_code |
| 1721 | = mips_linux_in_dynsym_resolve_code; |
| 1722 | } |
| 1723 | set_solib_ops (gdbarch, &mips_svr4_so_ops); |
| 1724 | |
| 1725 | set_gdbarch_write_pc (gdbarch, mips_linux_write_pc); |
| 1726 | |
| 1727 | set_gdbarch_core_read_description (gdbarch, |
| 1728 | mips_linux_core_read_description); |
| 1729 | |
| 1730 | set_gdbarch_iterate_over_regset_sections |
| 1731 | (gdbarch, mips_linux_iterate_over_regset_sections); |
| 1732 | |
| 1733 | set_gdbarch_gdb_signal_from_target (gdbarch, |
| 1734 | mips_gdb_signal_from_target); |
| 1735 | |
| 1736 | set_gdbarch_gdb_signal_to_target (gdbarch, |
| 1737 | mips_gdb_signal_to_target); |
| 1738 | |
| 1739 | tdep->syscall_next_pc = mips_linux_syscall_next_pc; |
| 1740 | |
| 1741 | if (tdesc_data) |
| 1742 | { |
| 1743 | const struct tdesc_feature *feature; |
| 1744 | |
| 1745 | /* If we have target-described registers, then we can safely |
| 1746 | reserve a number for MIPS_RESTART_REGNUM (whether it is |
| 1747 | described or not). */ |
| 1748 | gdb_assert (gdbarch_num_regs (gdbarch) <= MIPS_RESTART_REGNUM); |
| 1749 | set_gdbarch_num_regs (gdbarch, MIPS_RESTART_REGNUM + 1); |
| 1750 | set_gdbarch_num_pseudo_regs (gdbarch, MIPS_RESTART_REGNUM + 1); |
| 1751 | |
| 1752 | /* If it's present, then assign it to the reserved number. */ |
| 1753 | feature = tdesc_find_feature (info.target_desc, |
| 1754 | "org.gnu.gdb.mips.linux"); |
| 1755 | if (feature != NULL) |
| 1756 | tdesc_numbered_register (feature, tdesc_data, MIPS_RESTART_REGNUM, |
| 1757 | "restart"); |
| 1758 | } |
| 1759 | } |
| 1760 | |
| 1761 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 1762 | extern initialize_file_ftype _initialize_mips_linux_tdep; |
| 1763 | |
| 1764 | void |
| 1765 | _initialize_mips_linux_tdep (void) |
| 1766 | { |
| 1767 | const struct bfd_arch_info *arch_info; |
| 1768 | |
| 1769 | for (arch_info = bfd_lookup_arch (bfd_arch_mips, 0); |
| 1770 | arch_info != NULL; |
| 1771 | arch_info = arch_info->next) |
| 1772 | { |
| 1773 | gdbarch_register_osabi (bfd_arch_mips, arch_info->mach, |
| 1774 | GDB_OSABI_LINUX, |
| 1775 | mips_linux_init_abi); |
| 1776 | } |
| 1777 | } |