| 1 | /* Native-dependent code for GNU/Linux on MIPS processors. |
| 2 | |
| 3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 21 | Boston, MA 02110-1301, USA. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "inferior.h" |
| 25 | #include "mips-tdep.h" |
| 26 | #include "target.h" |
| 27 | #include "regcache.h" |
| 28 | #include "linux-nat.h" |
| 29 | #include "mips-linux-tdep.h" |
| 30 | #include "target-descriptions.h" |
| 31 | #include "xml-support.h" |
| 32 | |
| 33 | #include "gdb_proc_service.h" |
| 34 | #include "gregset.h" |
| 35 | |
| 36 | #include <sgidefs.h> |
| 37 | #include <sys/ptrace.h> |
| 38 | |
| 39 | #ifndef PTRACE_GET_THREAD_AREA |
| 40 | #define PTRACE_GET_THREAD_AREA 25 |
| 41 | #endif |
| 42 | |
| 43 | /* Assume that we have PTRACE_GETREGS et al. support. If we do not, |
| 44 | we'll clear this and use PTRACE_PEEKUSER instead. */ |
| 45 | static int have_ptrace_regsets = 1; |
| 46 | |
| 47 | /* Saved function pointers to fetch and store a single register using |
| 48 | PTRACE_PEEKUSER and PTRACE_POKEUSER. */ |
| 49 | |
| 50 | void (*super_fetch_registers) (struct regcache *, int); |
| 51 | void (*super_store_registers) (struct regcache *, int); |
| 52 | |
| 53 | /* Map gdb internal register number to ptrace ``address''. |
| 54 | These ``addresses'' are normally defined in <asm/ptrace.h>. |
| 55 | |
| 56 | ptrace does not provide a way to read (or set) MIPS_PS_REGNUM, |
| 57 | and there's no point in reading or setting MIPS_ZERO_REGNUM. |
| 58 | We also can not set BADVADDR, CAUSE, or FCRIR via ptrace(). */ |
| 59 | |
| 60 | static CORE_ADDR |
| 61 | mips_linux_register_addr (struct gdbarch *gdbarch, int regno, int store) |
| 62 | { |
| 63 | CORE_ADDR regaddr; |
| 64 | |
| 65 | if (regno < 0 || regno >= gdbarch_num_regs (current_gdbarch)) |
| 66 | error (_("Bogon register number %d."), regno); |
| 67 | |
| 68 | if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32) |
| 69 | regaddr = regno; |
| 70 | else if ((regno >= mips_regnum (gdbarch)->fp0) |
| 71 | && (regno < mips_regnum (gdbarch)->fp0 + 32)) |
| 72 | regaddr = FPR_BASE + (regno - mips_regnum (gdbarch)->fp0); |
| 73 | else if (regno == mips_regnum (gdbarch)->pc) |
| 74 | regaddr = PC; |
| 75 | else if (regno == mips_regnum (gdbarch)->cause) |
| 76 | regaddr = store? (CORE_ADDR) -1 : CAUSE; |
| 77 | else if (regno == mips_regnum (gdbarch)->badvaddr) |
| 78 | regaddr = store? (CORE_ADDR) -1 : BADVADDR; |
| 79 | else if (regno == mips_regnum (gdbarch)->lo) |
| 80 | regaddr = MMLO; |
| 81 | else if (regno == mips_regnum (gdbarch)->hi) |
| 82 | regaddr = MMHI; |
| 83 | else if (regno == mips_regnum (gdbarch)->fp_control_status) |
| 84 | regaddr = FPC_CSR; |
| 85 | else if (regno == mips_regnum (gdbarch)->fp_implementation_revision) |
| 86 | regaddr = store? (CORE_ADDR) -1 : FPC_EIR; |
| 87 | else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM) |
| 88 | regaddr = 0; |
| 89 | else |
| 90 | regaddr = (CORE_ADDR) -1; |
| 91 | |
| 92 | return regaddr; |
| 93 | } |
| 94 | |
| 95 | static CORE_ADDR |
| 96 | mips64_linux_register_addr (struct gdbarch *gdbarch, int regno, int store) |
| 97 | { |
| 98 | CORE_ADDR regaddr; |
| 99 | |
| 100 | if (regno < 0 || regno >= gdbarch_num_regs (current_gdbarch)) |
| 101 | error (_("Bogon register number %d."), regno); |
| 102 | |
| 103 | if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32) |
| 104 | regaddr = regno; |
| 105 | else if ((regno >= mips_regnum (gdbarch)->fp0) |
| 106 | && (regno < mips_regnum (gdbarch)->fp0 + 32)) |
| 107 | regaddr = MIPS64_FPR_BASE + (regno - FP0_REGNUM); |
| 108 | else if (regno == mips_regnum (gdbarch)->pc) |
| 109 | regaddr = MIPS64_PC; |
| 110 | else if (regno == mips_regnum (gdbarch)->cause) |
| 111 | regaddr = store? (CORE_ADDR) -1 : MIPS64_CAUSE; |
| 112 | else if (regno == mips_regnum (gdbarch)->badvaddr) |
| 113 | regaddr = store? (CORE_ADDR) -1 : MIPS64_BADVADDR; |
| 114 | else if (regno == mips_regnum (gdbarch)->lo) |
| 115 | regaddr = MIPS64_MMLO; |
| 116 | else if (regno == mips_regnum (gdbarch)->hi) |
| 117 | regaddr = MIPS64_MMHI; |
| 118 | else if (regno == mips_regnum (gdbarch)->fp_control_status) |
| 119 | regaddr = MIPS64_FPC_CSR; |
| 120 | else if (regno == mips_regnum (gdbarch)->fp_implementation_revision) |
| 121 | regaddr = store? (CORE_ADDR) -1 : MIPS64_FPC_EIR; |
| 122 | else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM) |
| 123 | regaddr = 0; |
| 124 | else |
| 125 | regaddr = (CORE_ADDR) -1; |
| 126 | |
| 127 | return regaddr; |
| 128 | } |
| 129 | |
| 130 | /* Fetch the thread-local storage pointer for libthread_db. */ |
| 131 | |
| 132 | ps_err_e |
| 133 | ps_get_thread_area (const struct ps_prochandle *ph, |
| 134 | lwpid_t lwpid, int idx, void **base) |
| 135 | { |
| 136 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) |
| 137 | return PS_ERR; |
| 138 | |
| 139 | /* IDX is the bias from the thread pointer to the beginning of the |
| 140 | thread descriptor. It has to be subtracted due to implementation |
| 141 | quirks in libthread_db. */ |
| 142 | *base = (void *) ((char *)*base - idx); |
| 143 | |
| 144 | return PS_OK; |
| 145 | } |
| 146 | |
| 147 | /* Wrapper functions. These are only used by libthread_db. */ |
| 148 | |
| 149 | void |
| 150 | supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) |
| 151 | { |
| 152 | if (mips_isa_regsize (current_gdbarch) == 4) |
| 153 | mips_supply_gregset (regcache, (const mips_elf_gregset_t *) gregsetp); |
| 154 | else |
| 155 | mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *) gregsetp); |
| 156 | } |
| 157 | |
| 158 | void |
| 159 | fill_gregset (const struct regcache *regcache, |
| 160 | gdb_gregset_t *gregsetp, int regno) |
| 161 | { |
| 162 | if (mips_isa_regsize (current_gdbarch) == 4) |
| 163 | mips_fill_gregset (regcache, (mips_elf_gregset_t *) gregsetp, regno); |
| 164 | else |
| 165 | mips64_fill_gregset (regcache, (mips64_elf_gregset_t *) gregsetp, regno); |
| 166 | } |
| 167 | |
| 168 | void |
| 169 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp) |
| 170 | { |
| 171 | if (mips_isa_regsize (current_gdbarch) == 4) |
| 172 | mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *) fpregsetp); |
| 173 | else |
| 174 | mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *) fpregsetp); |
| 175 | } |
| 176 | |
| 177 | void |
| 178 | fill_fpregset (const struct regcache *regcache, |
| 179 | gdb_fpregset_t *fpregsetp, int regno) |
| 180 | { |
| 181 | if (mips_isa_regsize (current_gdbarch) == 4) |
| 182 | mips_fill_fpregset (regcache, (mips_elf_fpregset_t *) fpregsetp, regno); |
| 183 | else |
| 184 | mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *) fpregsetp, regno); |
| 185 | } |
| 186 | |
| 187 | |
| 188 | /* Fetch REGNO (or all registers if REGNO == -1) from the target |
| 189 | using PTRACE_GETREGS et al. */ |
| 190 | |
| 191 | static void |
| 192 | mips64_linux_regsets_fetch_registers (struct regcache *regcache, int regno) |
| 193 | { |
| 194 | int is_fp; |
| 195 | int tid; |
| 196 | |
| 197 | if (regno >= mips_regnum (current_gdbarch)->fp0 |
| 198 | && regno <= mips_regnum (current_gdbarch)->fp0 + 32) |
| 199 | is_fp = 1; |
| 200 | else if (regno == mips_regnum (current_gdbarch)->fp_control_status) |
| 201 | is_fp = 1; |
| 202 | else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision) |
| 203 | is_fp = 1; |
| 204 | else |
| 205 | is_fp = 0; |
| 206 | |
| 207 | tid = ptid_get_lwp (inferior_ptid); |
| 208 | if (tid == 0) |
| 209 | tid = ptid_get_pid (inferior_ptid); |
| 210 | |
| 211 | if (regno == -1 || !is_fp) |
| 212 | { |
| 213 | mips64_elf_gregset_t regs; |
| 214 | |
| 215 | if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1) |
| 216 | { |
| 217 | if (errno == EIO) |
| 218 | { |
| 219 | have_ptrace_regsets = 0; |
| 220 | return; |
| 221 | } |
| 222 | perror_with_name (_("Couldn't get registers")); |
| 223 | } |
| 224 | |
| 225 | mips64_supply_gregset (regcache, |
| 226 | (const mips64_elf_gregset_t *) ®s); |
| 227 | } |
| 228 | |
| 229 | if (regno == -1 || is_fp) |
| 230 | { |
| 231 | mips64_elf_fpregset_t fp_regs; |
| 232 | |
| 233 | if (ptrace (PTRACE_GETFPREGS, tid, 0L, |
| 234 | (PTRACE_TYPE_ARG3) &fp_regs) == -1) |
| 235 | { |
| 236 | if (errno == EIO) |
| 237 | { |
| 238 | have_ptrace_regsets = 0; |
| 239 | return; |
| 240 | } |
| 241 | perror_with_name (_("Couldn't get FP registers")); |
| 242 | } |
| 243 | |
| 244 | mips64_supply_fpregset (regcache, |
| 245 | (const mips64_elf_fpregset_t *) &fp_regs); |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | /* Store REGNO (or all registers if REGNO == -1) to the target |
| 250 | using PTRACE_SETREGS et al. */ |
| 251 | |
| 252 | static void |
| 253 | mips64_linux_regsets_store_registers (const struct regcache *regcache, int regno) |
| 254 | { |
| 255 | int is_fp; |
| 256 | int tid; |
| 257 | |
| 258 | if (regno >= mips_regnum (current_gdbarch)->fp0 |
| 259 | && regno <= mips_regnum (current_gdbarch)->fp0 + 32) |
| 260 | is_fp = 1; |
| 261 | else if (regno == mips_regnum (current_gdbarch)->fp_control_status) |
| 262 | is_fp = 1; |
| 263 | else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision) |
| 264 | is_fp = 1; |
| 265 | else |
| 266 | is_fp = 0; |
| 267 | |
| 268 | tid = ptid_get_lwp (inferior_ptid); |
| 269 | if (tid == 0) |
| 270 | tid = ptid_get_pid (inferior_ptid); |
| 271 | |
| 272 | if (regno == -1 || !is_fp) |
| 273 | { |
| 274 | mips64_elf_gregset_t regs; |
| 275 | |
| 276 | if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1) |
| 277 | perror_with_name (_("Couldn't get registers")); |
| 278 | |
| 279 | mips64_fill_gregset (regcache, ®s, regno); |
| 280 | |
| 281 | if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1) |
| 282 | perror_with_name (_("Couldn't set registers")); |
| 283 | } |
| 284 | |
| 285 | if (regno == -1 || is_fp) |
| 286 | { |
| 287 | mips64_elf_fpregset_t fp_regs; |
| 288 | |
| 289 | if (ptrace (PTRACE_GETFPREGS, tid, 0L, |
| 290 | (PTRACE_TYPE_ARG3) &fp_regs) == -1) |
| 291 | perror_with_name (_("Couldn't get FP registers")); |
| 292 | |
| 293 | mips64_fill_fpregset (regcache, &fp_regs, regno); |
| 294 | |
| 295 | if (ptrace (PTRACE_SETFPREGS, tid, 0L, |
| 296 | (PTRACE_TYPE_ARG3) &fp_regs) == -1) |
| 297 | perror_with_name (_("Couldn't set FP registers")); |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | /* Fetch REGNO (or all registers if REGNO == -1) from the target |
| 302 | using any working method. */ |
| 303 | |
| 304 | static void |
| 305 | mips64_linux_fetch_registers (struct regcache *regcache, int regnum) |
| 306 | { |
| 307 | /* Unless we already know that PTRACE_GETREGS does not work, try it. */ |
| 308 | if (have_ptrace_regsets) |
| 309 | mips64_linux_regsets_fetch_registers (regcache, regnum); |
| 310 | |
| 311 | /* If we know, or just found out, that PTRACE_GETREGS does not work, fall |
| 312 | back to PTRACE_PEEKUSER. */ |
| 313 | if (!have_ptrace_regsets) |
| 314 | super_fetch_registers (regcache, regnum); |
| 315 | } |
| 316 | |
| 317 | /* Store REGNO (or all registers if REGNO == -1) to the target |
| 318 | using any working method. */ |
| 319 | |
| 320 | static void |
| 321 | mips64_linux_store_registers (struct regcache *regcache, int regnum) |
| 322 | { |
| 323 | /* Unless we already know that PTRACE_GETREGS does not work, try it. */ |
| 324 | if (have_ptrace_regsets) |
| 325 | mips64_linux_regsets_store_registers (regcache, regnum); |
| 326 | |
| 327 | /* If we know, or just found out, that PTRACE_GETREGS does not work, fall |
| 328 | back to PTRACE_PEEKUSER. */ |
| 329 | if (!have_ptrace_regsets) |
| 330 | super_store_registers (regcache, regnum); |
| 331 | } |
| 332 | |
| 333 | /* Return the address in the core dump or inferior of register |
| 334 | REGNO. */ |
| 335 | |
| 336 | static CORE_ADDR |
| 337 | mips_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p) |
| 338 | { |
| 339 | if (mips_abi_regsize (gdbarch) == 8) |
| 340 | return mips64_linux_register_addr (gdbarch, regno, store_p); |
| 341 | else |
| 342 | return mips_linux_register_addr (gdbarch, regno, store_p); |
| 343 | } |
| 344 | |
| 345 | static LONGEST (*super_xfer_partial) (struct target_ops *, enum target_object, |
| 346 | const char *, gdb_byte *, const gdb_byte *, |
| 347 | ULONGEST, LONGEST); |
| 348 | |
| 349 | static LONGEST |
| 350 | mips_linux_xfer_partial (struct target_ops *ops, |
| 351 | enum target_object object, |
| 352 | const char *annex, |
| 353 | gdb_byte *readbuf, const gdb_byte *writebuf, |
| 354 | ULONGEST offset, LONGEST len) |
| 355 | { |
| 356 | if (object == TARGET_OBJECT_AVAILABLE_FEATURES) |
| 357 | { |
| 358 | if (annex != NULL && strcmp (annex, "target.xml") == 0) |
| 359 | { |
| 360 | /* Report that target registers are a size we know for sure |
| 361 | that we can get from ptrace. */ |
| 362 | if (_MIPS_SIM == _ABIO32) |
| 363 | annex = "mips-linux.xml"; |
| 364 | else |
| 365 | annex = "mips64-linux.xml"; |
| 366 | } |
| 367 | |
| 368 | return xml_builtin_xfer_partial (annex, readbuf, writebuf, offset, len); |
| 369 | } |
| 370 | |
| 371 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, |
| 372 | offset, len); |
| 373 | } |
| 374 | |
| 375 | void _initialize_mips_linux_nat (void); |
| 376 | |
| 377 | void |
| 378 | _initialize_mips_linux_nat (void) |
| 379 | { |
| 380 | struct target_ops *t = linux_trad_target (mips_linux_register_u_offset); |
| 381 | |
| 382 | super_fetch_registers = t->to_fetch_registers; |
| 383 | super_store_registers = t->to_store_registers; |
| 384 | |
| 385 | t->to_fetch_registers = mips64_linux_fetch_registers; |
| 386 | t->to_store_registers = mips64_linux_store_registers; |
| 387 | |
| 388 | /* Override the default to_xfer_partial. */ |
| 389 | super_xfer_partial = t->to_xfer_partial; |
| 390 | t->to_xfer_partial = mips_linux_xfer_partial; |
| 391 | |
| 392 | linux_nat_add_target (t); |
| 393 | } |