| 1 | /* Native-dependent code for GNU/Linux on MIPS processors. |
| 2 | |
| 3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "command.h" |
| 23 | #include "gdbcmd.h" |
| 24 | #include "gdb_assert.h" |
| 25 | #include "inferior.h" |
| 26 | #include "mips-tdep.h" |
| 27 | #include "target.h" |
| 28 | #include "regcache.h" |
| 29 | #include "linux-nat.h" |
| 30 | #include "mips-linux-tdep.h" |
| 31 | #include "target-descriptions.h" |
| 32 | |
| 33 | #include "gdb_proc_service.h" |
| 34 | #include "gregset.h" |
| 35 | |
| 36 | #include <sgidefs.h> |
| 37 | #include <sys/ptrace.h> |
| 38 | |
| 39 | #include "features/mips-linux.c" |
| 40 | #include "features/mips64-linux.c" |
| 41 | |
| 42 | #ifndef PTRACE_GET_THREAD_AREA |
| 43 | #define PTRACE_GET_THREAD_AREA 25 |
| 44 | #endif |
| 45 | |
| 46 | /* Assume that we have PTRACE_GETREGS et al. support. If we do not, |
| 47 | we'll clear this and use PTRACE_PEEKUSER instead. */ |
| 48 | static int have_ptrace_regsets = 1; |
| 49 | |
| 50 | /* Whether or not to print the mirrored debug registers. */ |
| 51 | |
| 52 | static int maint_show_dr; |
| 53 | |
| 54 | /* Saved function pointers to fetch and store a single register using |
| 55 | PTRACE_PEEKUSER and PTRACE_POKEUSER. */ |
| 56 | |
| 57 | static void (*super_fetch_registers) (struct target_ops *, |
| 58 | struct regcache *, int); |
| 59 | static void (*super_store_registers) (struct target_ops *, |
| 60 | struct regcache *, int); |
| 61 | |
| 62 | static void (*super_close) (int); |
| 63 | |
| 64 | /* Map gdb internal register number to ptrace ``address''. |
| 65 | These ``addresses'' are normally defined in <asm/ptrace.h>. |
| 66 | |
| 67 | ptrace does not provide a way to read (or set) MIPS_PS_REGNUM, |
| 68 | and there's no point in reading or setting MIPS_ZERO_REGNUM. |
| 69 | We also can not set BADVADDR, CAUSE, or FCRIR via ptrace(). */ |
| 70 | |
| 71 | static CORE_ADDR |
| 72 | mips_linux_register_addr (struct gdbarch *gdbarch, int regno, int store) |
| 73 | { |
| 74 | CORE_ADDR regaddr; |
| 75 | |
| 76 | if (regno < 0 || regno >= gdbarch_num_regs (gdbarch)) |
| 77 | error (_("Bogon register number %d."), regno); |
| 78 | |
| 79 | if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32) |
| 80 | regaddr = regno; |
| 81 | else if ((regno >= mips_regnum (gdbarch)->fp0) |
| 82 | && (regno < mips_regnum (gdbarch)->fp0 + 32)) |
| 83 | regaddr = FPR_BASE + (regno - mips_regnum (gdbarch)->fp0); |
| 84 | else if (regno == mips_regnum (gdbarch)->pc) |
| 85 | regaddr = PC; |
| 86 | else if (regno == mips_regnum (gdbarch)->cause) |
| 87 | regaddr = store? (CORE_ADDR) -1 : CAUSE; |
| 88 | else if (regno == mips_regnum (gdbarch)->badvaddr) |
| 89 | regaddr = store? (CORE_ADDR) -1 : BADVADDR; |
| 90 | else if (regno == mips_regnum (gdbarch)->lo) |
| 91 | regaddr = MMLO; |
| 92 | else if (regno == mips_regnum (gdbarch)->hi) |
| 93 | regaddr = MMHI; |
| 94 | else if (regno == mips_regnum (gdbarch)->fp_control_status) |
| 95 | regaddr = FPC_CSR; |
| 96 | else if (regno == mips_regnum (gdbarch)->fp_implementation_revision) |
| 97 | regaddr = store? (CORE_ADDR) -1 : FPC_EIR; |
| 98 | else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM) |
| 99 | regaddr = 0; |
| 100 | else |
| 101 | regaddr = (CORE_ADDR) -1; |
| 102 | |
| 103 | return regaddr; |
| 104 | } |
| 105 | |
| 106 | static CORE_ADDR |
| 107 | mips64_linux_register_addr (struct gdbarch *gdbarch, int regno, int store) |
| 108 | { |
| 109 | CORE_ADDR regaddr; |
| 110 | |
| 111 | if (regno < 0 || regno >= gdbarch_num_regs (gdbarch)) |
| 112 | error (_("Bogon register number %d."), regno); |
| 113 | |
| 114 | if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32) |
| 115 | regaddr = regno; |
| 116 | else if ((regno >= mips_regnum (gdbarch)->fp0) |
| 117 | && (regno < mips_regnum (gdbarch)->fp0 + 32)) |
| 118 | regaddr = MIPS64_FPR_BASE + (regno - gdbarch_fp0_regnum (gdbarch)); |
| 119 | else if (regno == mips_regnum (gdbarch)->pc) |
| 120 | regaddr = MIPS64_PC; |
| 121 | else if (regno == mips_regnum (gdbarch)->cause) |
| 122 | regaddr = store? (CORE_ADDR) -1 : MIPS64_CAUSE; |
| 123 | else if (regno == mips_regnum (gdbarch)->badvaddr) |
| 124 | regaddr = store? (CORE_ADDR) -1 : MIPS64_BADVADDR; |
| 125 | else if (regno == mips_regnum (gdbarch)->lo) |
| 126 | regaddr = MIPS64_MMLO; |
| 127 | else if (regno == mips_regnum (gdbarch)->hi) |
| 128 | regaddr = MIPS64_MMHI; |
| 129 | else if (regno == mips_regnum (gdbarch)->fp_control_status) |
| 130 | regaddr = MIPS64_FPC_CSR; |
| 131 | else if (regno == mips_regnum (gdbarch)->fp_implementation_revision) |
| 132 | regaddr = store? (CORE_ADDR) -1 : MIPS64_FPC_EIR; |
| 133 | else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM) |
| 134 | regaddr = 0; |
| 135 | else |
| 136 | regaddr = (CORE_ADDR) -1; |
| 137 | |
| 138 | return regaddr; |
| 139 | } |
| 140 | |
| 141 | /* Fetch the thread-local storage pointer for libthread_db. */ |
| 142 | |
| 143 | ps_err_e |
| 144 | ps_get_thread_area (const struct ps_prochandle *ph, |
| 145 | lwpid_t lwpid, int idx, void **base) |
| 146 | { |
| 147 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) |
| 148 | return PS_ERR; |
| 149 | |
| 150 | /* IDX is the bias from the thread pointer to the beginning of the |
| 151 | thread descriptor. It has to be subtracted due to implementation |
| 152 | quirks in libthread_db. */ |
| 153 | *base = (void *) ((char *)*base - idx); |
| 154 | |
| 155 | return PS_OK; |
| 156 | } |
| 157 | |
| 158 | /* Wrapper functions. These are only used by libthread_db. */ |
| 159 | |
| 160 | void |
| 161 | supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) |
| 162 | { |
| 163 | if (mips_isa_regsize (get_regcache_arch (regcache)) == 4) |
| 164 | mips_supply_gregset (regcache, (const mips_elf_gregset_t *) gregsetp); |
| 165 | else |
| 166 | mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *) gregsetp); |
| 167 | } |
| 168 | |
| 169 | void |
| 170 | fill_gregset (const struct regcache *regcache, |
| 171 | gdb_gregset_t *gregsetp, int regno) |
| 172 | { |
| 173 | if (mips_isa_regsize (get_regcache_arch (regcache)) == 4) |
| 174 | mips_fill_gregset (regcache, (mips_elf_gregset_t *) gregsetp, regno); |
| 175 | else |
| 176 | mips64_fill_gregset (regcache, (mips64_elf_gregset_t *) gregsetp, regno); |
| 177 | } |
| 178 | |
| 179 | void |
| 180 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp) |
| 181 | { |
| 182 | if (mips_isa_regsize (get_regcache_arch (regcache)) == 4) |
| 183 | mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *) fpregsetp); |
| 184 | else |
| 185 | mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *) fpregsetp); |
| 186 | } |
| 187 | |
| 188 | void |
| 189 | fill_fpregset (const struct regcache *regcache, |
| 190 | gdb_fpregset_t *fpregsetp, int regno) |
| 191 | { |
| 192 | if (mips_isa_regsize (get_regcache_arch (regcache)) == 4) |
| 193 | mips_fill_fpregset (regcache, (mips_elf_fpregset_t *) fpregsetp, regno); |
| 194 | else |
| 195 | mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *) fpregsetp, regno); |
| 196 | } |
| 197 | |
| 198 | |
| 199 | /* Fetch REGNO (or all registers if REGNO == -1) from the target |
| 200 | using PTRACE_GETREGS et al. */ |
| 201 | |
| 202 | static void |
| 203 | mips64_linux_regsets_fetch_registers (struct regcache *regcache, int regno) |
| 204 | { |
| 205 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 206 | int is_fp; |
| 207 | int tid; |
| 208 | |
| 209 | if (regno >= mips_regnum (gdbarch)->fp0 |
| 210 | && regno <= mips_regnum (gdbarch)->fp0 + 32) |
| 211 | is_fp = 1; |
| 212 | else if (regno == mips_regnum (gdbarch)->fp_control_status) |
| 213 | is_fp = 1; |
| 214 | else if (regno == mips_regnum (gdbarch)->fp_implementation_revision) |
| 215 | is_fp = 1; |
| 216 | else |
| 217 | is_fp = 0; |
| 218 | |
| 219 | tid = ptid_get_lwp (inferior_ptid); |
| 220 | if (tid == 0) |
| 221 | tid = ptid_get_pid (inferior_ptid); |
| 222 | |
| 223 | if (regno == -1 || !is_fp) |
| 224 | { |
| 225 | mips64_elf_gregset_t regs; |
| 226 | |
| 227 | if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1) |
| 228 | { |
| 229 | if (errno == EIO) |
| 230 | { |
| 231 | have_ptrace_regsets = 0; |
| 232 | return; |
| 233 | } |
| 234 | perror_with_name (_("Couldn't get registers")); |
| 235 | } |
| 236 | |
| 237 | mips64_supply_gregset (regcache, |
| 238 | (const mips64_elf_gregset_t *) ®s); |
| 239 | } |
| 240 | |
| 241 | if (regno == -1 || is_fp) |
| 242 | { |
| 243 | mips64_elf_fpregset_t fp_regs; |
| 244 | |
| 245 | if (ptrace (PTRACE_GETFPREGS, tid, 0L, |
| 246 | (PTRACE_TYPE_ARG3) &fp_regs) == -1) |
| 247 | { |
| 248 | if (errno == EIO) |
| 249 | { |
| 250 | have_ptrace_regsets = 0; |
| 251 | return; |
| 252 | } |
| 253 | perror_with_name (_("Couldn't get FP registers")); |
| 254 | } |
| 255 | |
| 256 | mips64_supply_fpregset (regcache, |
| 257 | (const mips64_elf_fpregset_t *) &fp_regs); |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | /* Store REGNO (or all registers if REGNO == -1) to the target |
| 262 | using PTRACE_SETREGS et al. */ |
| 263 | |
| 264 | static void |
| 265 | mips64_linux_regsets_store_registers (const struct regcache *regcache, int regno) |
| 266 | { |
| 267 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 268 | int is_fp; |
| 269 | int tid; |
| 270 | |
| 271 | if (regno >= mips_regnum (gdbarch)->fp0 |
| 272 | && regno <= mips_regnum (gdbarch)->fp0 + 32) |
| 273 | is_fp = 1; |
| 274 | else if (regno == mips_regnum (gdbarch)->fp_control_status) |
| 275 | is_fp = 1; |
| 276 | else if (regno == mips_regnum (gdbarch)->fp_implementation_revision) |
| 277 | is_fp = 1; |
| 278 | else |
| 279 | is_fp = 0; |
| 280 | |
| 281 | tid = ptid_get_lwp (inferior_ptid); |
| 282 | if (tid == 0) |
| 283 | tid = ptid_get_pid (inferior_ptid); |
| 284 | |
| 285 | if (regno == -1 || !is_fp) |
| 286 | { |
| 287 | mips64_elf_gregset_t regs; |
| 288 | |
| 289 | if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1) |
| 290 | perror_with_name (_("Couldn't get registers")); |
| 291 | |
| 292 | mips64_fill_gregset (regcache, ®s, regno); |
| 293 | |
| 294 | if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1) |
| 295 | perror_with_name (_("Couldn't set registers")); |
| 296 | } |
| 297 | |
| 298 | if (regno == -1 || is_fp) |
| 299 | { |
| 300 | mips64_elf_fpregset_t fp_regs; |
| 301 | |
| 302 | if (ptrace (PTRACE_GETFPREGS, tid, 0L, |
| 303 | (PTRACE_TYPE_ARG3) &fp_regs) == -1) |
| 304 | perror_with_name (_("Couldn't get FP registers")); |
| 305 | |
| 306 | mips64_fill_fpregset (regcache, &fp_regs, regno); |
| 307 | |
| 308 | if (ptrace (PTRACE_SETFPREGS, tid, 0L, |
| 309 | (PTRACE_TYPE_ARG3) &fp_regs) == -1) |
| 310 | perror_with_name (_("Couldn't set FP registers")); |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | /* Fetch REGNO (or all registers if REGNO == -1) from the target |
| 315 | using any working method. */ |
| 316 | |
| 317 | static void |
| 318 | mips64_linux_fetch_registers (struct target_ops *ops, |
| 319 | struct regcache *regcache, int regnum) |
| 320 | { |
| 321 | /* Unless we already know that PTRACE_GETREGS does not work, try it. */ |
| 322 | if (have_ptrace_regsets) |
| 323 | mips64_linux_regsets_fetch_registers (regcache, regnum); |
| 324 | |
| 325 | /* If we know, or just found out, that PTRACE_GETREGS does not work, fall |
| 326 | back to PTRACE_PEEKUSER. */ |
| 327 | if (!have_ptrace_regsets) |
| 328 | super_fetch_registers (ops, regcache, regnum); |
| 329 | } |
| 330 | |
| 331 | /* Store REGNO (or all registers if REGNO == -1) to the target |
| 332 | using any working method. */ |
| 333 | |
| 334 | static void |
| 335 | mips64_linux_store_registers (struct target_ops *ops, |
| 336 | struct regcache *regcache, int regnum) |
| 337 | { |
| 338 | /* Unless we already know that PTRACE_GETREGS does not work, try it. */ |
| 339 | if (have_ptrace_regsets) |
| 340 | mips64_linux_regsets_store_registers (regcache, regnum); |
| 341 | |
| 342 | /* If we know, or just found out, that PTRACE_GETREGS does not work, fall |
| 343 | back to PTRACE_PEEKUSER. */ |
| 344 | if (!have_ptrace_regsets) |
| 345 | super_store_registers (ops, regcache, regnum); |
| 346 | } |
| 347 | |
| 348 | /* Return the address in the core dump or inferior of register |
| 349 | REGNO. */ |
| 350 | |
| 351 | static CORE_ADDR |
| 352 | mips_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p) |
| 353 | { |
| 354 | if (mips_abi_regsize (gdbarch) == 8) |
| 355 | return mips64_linux_register_addr (gdbarch, regno, store_p); |
| 356 | else |
| 357 | return mips_linux_register_addr (gdbarch, regno, store_p); |
| 358 | } |
| 359 | |
| 360 | static const struct target_desc * |
| 361 | mips_linux_read_description (struct target_ops *ops) |
| 362 | { |
| 363 | /* Report that target registers are a size we know for sure |
| 364 | that we can get from ptrace. */ |
| 365 | if (_MIPS_SIM == _ABIO32) |
| 366 | return tdesc_mips_linux; |
| 367 | else |
| 368 | return tdesc_mips64_linux; |
| 369 | } |
| 370 | |
| 371 | #ifndef PTRACE_GET_WATCH_REGS |
| 372 | # define PTRACE_GET_WATCH_REGS 0xd0 |
| 373 | #endif |
| 374 | |
| 375 | #ifndef PTRACE_SET_WATCH_REGS |
| 376 | # define PTRACE_SET_WATCH_REGS 0xd1 |
| 377 | #endif |
| 378 | |
| 379 | #define W_BIT 0 |
| 380 | #define R_BIT 1 |
| 381 | #define I_BIT 2 |
| 382 | |
| 383 | #define W_MASK (1 << W_BIT) |
| 384 | #define R_MASK (1 << R_BIT) |
| 385 | #define I_MASK (1 << I_BIT) |
| 386 | |
| 387 | #define IRW_MASK (I_MASK | R_MASK | W_MASK) |
| 388 | |
| 389 | enum pt_watch_style { |
| 390 | pt_watch_style_mips32, |
| 391 | pt_watch_style_mips64 |
| 392 | }; |
| 393 | |
| 394 | #define MAX_DEBUG_REGISTER 8 |
| 395 | |
| 396 | /* A value of zero in a watchlo indicates that it is available. */ |
| 397 | |
| 398 | struct mips32_watch_regs |
| 399 | { |
| 400 | uint32_t watchlo[MAX_DEBUG_REGISTER]; |
| 401 | /* Lower 16 bits of watchhi. */ |
| 402 | uint16_t watchhi[MAX_DEBUG_REGISTER]; |
| 403 | /* Valid mask and I R W bits. |
| 404 | * bit 0 -- 1 if W bit is usable. |
| 405 | * bit 1 -- 1 if R bit is usable. |
| 406 | * bit 2 -- 1 if I bit is usable. |
| 407 | * bits 3 - 11 -- Valid watchhi mask bits. |
| 408 | */ |
| 409 | uint16_t watch_masks[MAX_DEBUG_REGISTER]; |
| 410 | /* The number of valid watch register pairs. */ |
| 411 | uint32_t num_valid; |
| 412 | /* There is confusion across gcc versions about structure alignment, |
| 413 | so we force 8 byte alignment for these structures so they match |
| 414 | the kernel even if it was build with a different gcc version. */ |
| 415 | } __attribute__ ((aligned (8))); |
| 416 | |
| 417 | struct mips64_watch_regs |
| 418 | { |
| 419 | uint64_t watchlo[MAX_DEBUG_REGISTER]; |
| 420 | uint16_t watchhi[MAX_DEBUG_REGISTER]; |
| 421 | uint16_t watch_masks[MAX_DEBUG_REGISTER]; |
| 422 | uint32_t num_valid; |
| 423 | } __attribute__ ((aligned (8))); |
| 424 | |
| 425 | struct pt_watch_regs |
| 426 | { |
| 427 | enum pt_watch_style style; |
| 428 | union |
| 429 | { |
| 430 | struct mips32_watch_regs mips32; |
| 431 | struct mips64_watch_regs mips64; |
| 432 | }; |
| 433 | }; |
| 434 | |
| 435 | /* -1 if the kernel and/or CPU do not support watch registers. |
| 436 | 1 if watch_readback is valid and we can read style, num_valid |
| 437 | and the masks. |
| 438 | 0 if we need to read the watch_readback. */ |
| 439 | |
| 440 | static int watch_readback_valid; |
| 441 | |
| 442 | /* Cached watch register read values. */ |
| 443 | |
| 444 | static struct pt_watch_regs watch_readback; |
| 445 | |
| 446 | /* We keep list of all watchpoints we should install and calculate the |
| 447 | watch register values each time the list changes. This allows for |
| 448 | easy sharing of watch registers for more than one watchpoint. */ |
| 449 | |
| 450 | struct mips_watchpoint |
| 451 | { |
| 452 | CORE_ADDR addr; |
| 453 | int len; |
| 454 | int type; |
| 455 | struct mips_watchpoint *next; |
| 456 | }; |
| 457 | |
| 458 | static struct mips_watchpoint *current_watches; |
| 459 | |
| 460 | /* The current set of watch register values for writing the |
| 461 | registers. */ |
| 462 | |
| 463 | static struct pt_watch_regs watch_mirror; |
| 464 | |
| 465 | /* Assuming usable watch registers, return the irw_mask. */ |
| 466 | |
| 467 | static uint32_t |
| 468 | get_irw_mask (struct pt_watch_regs *regs, int set) |
| 469 | { |
| 470 | switch (regs->style) |
| 471 | { |
| 472 | case pt_watch_style_mips32: |
| 473 | return regs->mips32.watch_masks[set] & IRW_MASK; |
| 474 | case pt_watch_style_mips64: |
| 475 | return regs->mips64.watch_masks[set] & IRW_MASK; |
| 476 | default: |
| 477 | internal_error (__FILE__, __LINE__, |
| 478 | _("Unrecognized watch register style")); |
| 479 | } |
| 480 | } |
| 481 | |
| 482 | /* Assuming usable watch registers, return the reg_mask. */ |
| 483 | |
| 484 | static uint32_t |
| 485 | get_reg_mask (struct pt_watch_regs *regs, int set) |
| 486 | { |
| 487 | switch (regs->style) |
| 488 | { |
| 489 | case pt_watch_style_mips32: |
| 490 | return regs->mips32.watch_masks[set] & ~IRW_MASK; |
| 491 | case pt_watch_style_mips64: |
| 492 | return regs->mips64.watch_masks[set] & ~IRW_MASK; |
| 493 | default: |
| 494 | internal_error (__FILE__, __LINE__, |
| 495 | _("Unrecognized watch register style")); |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | /* Assuming usable watch registers, return the num_valid. */ |
| 500 | |
| 501 | static uint32_t |
| 502 | get_num_valid (struct pt_watch_regs *regs) |
| 503 | { |
| 504 | switch (regs->style) |
| 505 | { |
| 506 | case pt_watch_style_mips32: |
| 507 | return regs->mips32.num_valid; |
| 508 | case pt_watch_style_mips64: |
| 509 | return regs->mips64.num_valid; |
| 510 | default: |
| 511 | internal_error (__FILE__, __LINE__, |
| 512 | _("Unrecognized watch register style")); |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | /* Assuming usable watch registers, return the watchlo. */ |
| 517 | |
| 518 | static CORE_ADDR |
| 519 | get_watchlo (struct pt_watch_regs *regs, int set) |
| 520 | { |
| 521 | switch (regs->style) |
| 522 | { |
| 523 | case pt_watch_style_mips32: |
| 524 | return regs->mips32.watchlo[set]; |
| 525 | case pt_watch_style_mips64: |
| 526 | return regs->mips64.watchlo[set]; |
| 527 | default: |
| 528 | internal_error (__FILE__, __LINE__, |
| 529 | _("Unrecognized watch register style")); |
| 530 | } |
| 531 | } |
| 532 | |
| 533 | /* Assuming usable watch registers, set a watchlo value. */ |
| 534 | |
| 535 | static void |
| 536 | set_watchlo (struct pt_watch_regs *regs, int set, CORE_ADDR value) |
| 537 | { |
| 538 | switch (regs->style) |
| 539 | { |
| 540 | case pt_watch_style_mips32: |
| 541 | /* The cast will never throw away bits as 64 bit addresses can |
| 542 | never be used on a 32 bit kernel. */ |
| 543 | regs->mips32.watchlo[set] = (uint32_t)value; |
| 544 | break; |
| 545 | case pt_watch_style_mips64: |
| 546 | regs->mips64.watchlo[set] = value; |
| 547 | break; |
| 548 | default: |
| 549 | internal_error (__FILE__, __LINE__, |
| 550 | _("Unrecognized watch register style")); |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | /* Assuming usable watch registers, return the watchhi. */ |
| 555 | |
| 556 | static uint32_t |
| 557 | get_watchhi (struct pt_watch_regs *regs, int n) |
| 558 | { |
| 559 | switch (regs->style) |
| 560 | { |
| 561 | case pt_watch_style_mips32: |
| 562 | return regs->mips32.watchhi[n]; |
| 563 | case pt_watch_style_mips64: |
| 564 | return regs->mips64.watchhi[n]; |
| 565 | default: |
| 566 | internal_error (__FILE__, __LINE__, |
| 567 | _("Unrecognized watch register style")); |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | /* Assuming usable watch registers, set a watchhi value. */ |
| 572 | |
| 573 | static void |
| 574 | set_watchhi (struct pt_watch_regs *regs, int n, uint16_t value) |
| 575 | { |
| 576 | switch (regs->style) |
| 577 | { |
| 578 | case pt_watch_style_mips32: |
| 579 | regs->mips32.watchhi[n] = value; |
| 580 | break; |
| 581 | case pt_watch_style_mips64: |
| 582 | regs->mips64.watchhi[n] = value; |
| 583 | break; |
| 584 | default: |
| 585 | internal_error (__FILE__, __LINE__, |
| 586 | _("Unrecognized watch register style")); |
| 587 | } |
| 588 | } |
| 589 | |
| 590 | static void |
| 591 | mips_show_dr (const char *func, CORE_ADDR addr, |
| 592 | int len, enum target_hw_bp_type type) |
| 593 | { |
| 594 | int i; |
| 595 | |
| 596 | puts_unfiltered (func); |
| 597 | if (addr || len) |
| 598 | printf_unfiltered (" (addr=%s, len=%d, type=%s)", |
| 599 | paddress (target_gdbarch, addr), len, |
| 600 | type == hw_write ? "data-write" |
| 601 | : (type == hw_read ? "data-read" |
| 602 | : (type == hw_access ? "data-read/write" |
| 603 | : (type == hw_execute ? "instruction-execute" |
| 604 | : "??unknown??")))); |
| 605 | puts_unfiltered (":\n"); |
| 606 | |
| 607 | for (i = 0; i < MAX_DEBUG_REGISTER; i++) |
| 608 | printf_unfiltered ("\tDR%d: lo=%s, hi=%s\n", i, |
| 609 | paddress (target_gdbarch, |
| 610 | get_watchlo (&watch_mirror, i)), |
| 611 | paddress (target_gdbarch, |
| 612 | get_watchhi (&watch_mirror, i))); |
| 613 | } |
| 614 | |
| 615 | /* Return 1 if watch registers are usable. Cached information is used |
| 616 | unless force is true. */ |
| 617 | |
| 618 | static int |
| 619 | mips_linux_read_watch_registers (int force) |
| 620 | { |
| 621 | int tid; |
| 622 | |
| 623 | if (force || watch_readback_valid == 0) |
| 624 | { |
| 625 | tid = ptid_get_lwp (inferior_ptid); |
| 626 | if (ptrace (PTRACE_GET_WATCH_REGS, tid, &watch_readback) == -1) |
| 627 | { |
| 628 | watch_readback_valid = -1; |
| 629 | return 0; |
| 630 | } |
| 631 | switch (watch_readback.style) |
| 632 | { |
| 633 | case pt_watch_style_mips32: |
| 634 | if (watch_readback.mips32.num_valid == 0) |
| 635 | { |
| 636 | watch_readback_valid = -1; |
| 637 | return 0; |
| 638 | } |
| 639 | break; |
| 640 | case pt_watch_style_mips64: |
| 641 | if (watch_readback.mips64.num_valid == 0) |
| 642 | { |
| 643 | watch_readback_valid = -1; |
| 644 | return 0; |
| 645 | } |
| 646 | break; |
| 647 | default: |
| 648 | watch_readback_valid = -1; |
| 649 | return 0; |
| 650 | } |
| 651 | /* Watch registers appear to be usable. */ |
| 652 | watch_readback_valid = 1; |
| 653 | } |
| 654 | return (watch_readback_valid == 1) ? 1 : 0; |
| 655 | } |
| 656 | |
| 657 | /* Convert GDB's type to an IRW mask. */ |
| 658 | |
| 659 | static unsigned |
| 660 | type_to_irw (int type) |
| 661 | { |
| 662 | switch (type) |
| 663 | { |
| 664 | case hw_write: |
| 665 | return W_MASK; |
| 666 | case hw_read: |
| 667 | return R_MASK; |
| 668 | case hw_access: |
| 669 | return (W_MASK | R_MASK); |
| 670 | default: |
| 671 | return 0; |
| 672 | } |
| 673 | } |
| 674 | |
| 675 | /* Target to_can_use_hw_breakpoint implementation. Return 1 if we can |
| 676 | handle the specified watch type. */ |
| 677 | |
| 678 | static int |
| 679 | mips_linux_can_use_hw_breakpoint (int type, int cnt, int ot) |
| 680 | { |
| 681 | int i; |
| 682 | uint32_t wanted_mask, irw_mask; |
| 683 | |
| 684 | if (!mips_linux_read_watch_registers (0)) |
| 685 | return 0; |
| 686 | |
| 687 | switch (type) |
| 688 | { |
| 689 | case bp_hardware_watchpoint: |
| 690 | wanted_mask = W_MASK; |
| 691 | break; |
| 692 | case bp_read_watchpoint: |
| 693 | wanted_mask = R_MASK; |
| 694 | break; |
| 695 | case bp_access_watchpoint: |
| 696 | wanted_mask = R_MASK | W_MASK; |
| 697 | break; |
| 698 | default: |
| 699 | return 0; |
| 700 | } |
| 701 | |
| 702 | for (i = 0; i < get_num_valid (&watch_readback) && cnt; i++) |
| 703 | { |
| 704 | irw_mask = get_irw_mask (&watch_readback, i); |
| 705 | if ((irw_mask & wanted_mask) == wanted_mask) |
| 706 | cnt--; |
| 707 | } |
| 708 | return (cnt == 0) ? 1 : 0; |
| 709 | } |
| 710 | |
| 711 | /* Target to_stopped_by_watchpoint implementation. Return 1 if |
| 712 | stopped by watchpoint. The watchhi R and W bits indicate the watch |
| 713 | register triggered. */ |
| 714 | |
| 715 | static int |
| 716 | mips_linux_stopped_by_watchpoint (void) |
| 717 | { |
| 718 | int n; |
| 719 | int num_valid; |
| 720 | |
| 721 | if (!mips_linux_read_watch_registers (1)) |
| 722 | return 0; |
| 723 | |
| 724 | num_valid = get_num_valid (&watch_readback); |
| 725 | |
| 726 | for (n = 0; n < MAX_DEBUG_REGISTER && n < num_valid; n++) |
| 727 | if (get_watchhi (&watch_readback, n) & (R_MASK | W_MASK)) |
| 728 | return 1; |
| 729 | |
| 730 | return 0; |
| 731 | } |
| 732 | |
| 733 | /* Target to_stopped_data_address implementation. Set the address |
| 734 | where the watch triggered (if known). Return 1 if the address was |
| 735 | known. */ |
| 736 | |
| 737 | static int |
| 738 | mips_linux_stopped_data_address (struct target_ops *t, CORE_ADDR *paddr) |
| 739 | { |
| 740 | /* On mips we don't know the low order 3 bits of the data address, |
| 741 | so we must return false. */ |
| 742 | return 0; |
| 743 | } |
| 744 | |
| 745 | /* Set any low order bits in mask that are not set. */ |
| 746 | |
| 747 | static CORE_ADDR |
| 748 | fill_mask (CORE_ADDR mask) |
| 749 | { |
| 750 | CORE_ADDR f = 1; |
| 751 | while (f && f < mask) |
| 752 | { |
| 753 | mask |= f; |
| 754 | f <<= 1; |
| 755 | } |
| 756 | return mask; |
| 757 | } |
| 758 | |
| 759 | /* Try to add a single watch to the specified registers. Return 1 on |
| 760 | success, 0 on failure. */ |
| 761 | |
| 762 | static int |
| 763 | try_one_watch (struct pt_watch_regs *regs, CORE_ADDR addr, |
| 764 | int len, unsigned irw) |
| 765 | { |
| 766 | CORE_ADDR base_addr, last_byte, break_addr, segment_len; |
| 767 | CORE_ADDR mask_bits, t_low, t_low_end; |
| 768 | uint16_t t_hi; |
| 769 | int i, free_watches; |
| 770 | struct pt_watch_regs regs_copy; |
| 771 | |
| 772 | if (len <= 0) |
| 773 | return 0; |
| 774 | |
| 775 | last_byte = addr + len - 1; |
| 776 | mask_bits = fill_mask (addr ^ last_byte) | IRW_MASK; |
| 777 | base_addr = addr & ~mask_bits; |
| 778 | |
| 779 | /* Check to see if it is covered by current registers. */ |
| 780 | for (i = 0; i < get_num_valid (regs); i++) |
| 781 | { |
| 782 | t_low = get_watchlo (regs, i); |
| 783 | if (t_low != 0 && irw == ((unsigned)t_low & irw)) |
| 784 | { |
| 785 | t_hi = get_watchhi (regs, i) | IRW_MASK; |
| 786 | t_low &= ~(CORE_ADDR)t_hi; |
| 787 | if (addr >= t_low && last_byte <= (t_low + t_hi)) |
| 788 | return 1; |
| 789 | } |
| 790 | } |
| 791 | /* Try to find an empty register. */ |
| 792 | free_watches = 0; |
| 793 | for (i = 0; i < get_num_valid (regs); i++) |
| 794 | { |
| 795 | t_low = get_watchlo (regs, i); |
| 796 | if (t_low == 0 && irw == (get_irw_mask (regs, i) & irw)) |
| 797 | { |
| 798 | if (mask_bits <= (get_reg_mask (regs, i) | IRW_MASK)) |
| 799 | { |
| 800 | /* It fits, we'll take it. */ |
| 801 | set_watchlo (regs, i, base_addr | irw); |
| 802 | set_watchhi (regs, i, mask_bits & ~IRW_MASK); |
| 803 | return 1; |
| 804 | } |
| 805 | else |
| 806 | { |
| 807 | /* It doesn't fit, but has the proper IRW capabilities. */ |
| 808 | free_watches++; |
| 809 | } |
| 810 | } |
| 811 | } |
| 812 | if (free_watches > 1) |
| 813 | { |
| 814 | /* Try to split it across several registers. */ |
| 815 | regs_copy = *regs; |
| 816 | for (i = 0; i < get_num_valid (®s_copy); i++) |
| 817 | { |
| 818 | t_low = get_watchlo (®s_copy, i); |
| 819 | t_hi = get_reg_mask (®s_copy, i) | IRW_MASK; |
| 820 | if (t_low == 0 && irw == (t_hi & irw)) |
| 821 | { |
| 822 | t_low = addr & ~(CORE_ADDR)t_hi; |
| 823 | break_addr = t_low + t_hi + 1; |
| 824 | if (break_addr >= addr + len) |
| 825 | segment_len = len; |
| 826 | else |
| 827 | segment_len = break_addr - addr; |
| 828 | mask_bits = fill_mask (addr ^ (addr + segment_len - 1)); |
| 829 | set_watchlo (®s_copy, i, (addr & ~mask_bits) | irw); |
| 830 | set_watchhi (®s_copy, i, mask_bits & ~IRW_MASK); |
| 831 | if (break_addr >= addr + len) |
| 832 | { |
| 833 | *regs = regs_copy; |
| 834 | return 1; |
| 835 | } |
| 836 | len = addr + len - break_addr; |
| 837 | addr = break_addr; |
| 838 | } |
| 839 | } |
| 840 | } |
| 841 | /* It didn't fit anywhere, we failed. */ |
| 842 | return 0; |
| 843 | } |
| 844 | |
| 845 | /* Target to_region_ok_for_hw_watchpoint implementation. Return 1 if |
| 846 | the specified region can be covered by the watch registers. */ |
| 847 | |
| 848 | static int |
| 849 | mips_linux_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) |
| 850 | { |
| 851 | struct pt_watch_regs dummy_regs; |
| 852 | int i; |
| 853 | |
| 854 | if (!mips_linux_read_watch_registers (0)) |
| 855 | return 0; |
| 856 | |
| 857 | dummy_regs = watch_readback; |
| 858 | /* Clear them out. */ |
| 859 | for (i = 0; i < get_num_valid (&dummy_regs); i++) |
| 860 | set_watchlo (&dummy_regs, i, 0); |
| 861 | return try_one_watch (&dummy_regs, addr, len, 0); |
| 862 | } |
| 863 | |
| 864 | |
| 865 | /* Write the mirrored watch register values for each thread. */ |
| 866 | |
| 867 | static int |
| 868 | write_watchpoint_regs (void) |
| 869 | { |
| 870 | struct lwp_info *lp; |
| 871 | ptid_t ptid; |
| 872 | int tid; |
| 873 | |
| 874 | ALL_LWPS (lp, ptid) |
| 875 | { |
| 876 | tid = ptid_get_lwp (ptid); |
| 877 | if (ptrace (PTRACE_SET_WATCH_REGS, tid, &watch_mirror) == -1) |
| 878 | perror_with_name (_("Couldn't write debug register")); |
| 879 | } |
| 880 | return 0; |
| 881 | } |
| 882 | |
| 883 | /* linux_nat new_thread implementation. Write the mirrored watch |
| 884 | register values for the new thread. */ |
| 885 | |
| 886 | static void |
| 887 | mips_linux_new_thread (ptid_t ptid) |
| 888 | { |
| 889 | int tid; |
| 890 | |
| 891 | if (!mips_linux_read_watch_registers (0)) |
| 892 | return; |
| 893 | |
| 894 | tid = ptid_get_lwp (ptid); |
| 895 | if (ptrace (PTRACE_SET_WATCH_REGS, tid, &watch_mirror) == -1) |
| 896 | perror_with_name (_("Couldn't write debug register")); |
| 897 | } |
| 898 | |
| 899 | /* Fill in the watch registers with the currently cached watches. */ |
| 900 | |
| 901 | static void |
| 902 | populate_regs_from_watches (struct pt_watch_regs *regs) |
| 903 | { |
| 904 | struct mips_watchpoint *w; |
| 905 | int i; |
| 906 | |
| 907 | /* Clear them out. */ |
| 908 | for (i = 0; i < get_num_valid (regs); i++) |
| 909 | { |
| 910 | set_watchlo (regs, i, 0); |
| 911 | set_watchhi (regs, i, 0); |
| 912 | } |
| 913 | |
| 914 | w = current_watches; |
| 915 | while (w) |
| 916 | { |
| 917 | i = try_one_watch (regs, w->addr, w->len, type_to_irw (w->type)); |
| 918 | /* They must all fit, because we previously calculated that they |
| 919 | would. */ |
| 920 | gdb_assert (i); |
| 921 | w = w->next; |
| 922 | } |
| 923 | } |
| 924 | |
| 925 | /* Target to_insert_watchpoint implementation. Try to insert a new |
| 926 | watch. Return zero on success. */ |
| 927 | |
| 928 | static int |
| 929 | mips_linux_insert_watchpoint (CORE_ADDR addr, int len, int type) |
| 930 | { |
| 931 | struct pt_watch_regs regs; |
| 932 | struct mips_watchpoint *new_watch; |
| 933 | struct mips_watchpoint **pw; |
| 934 | |
| 935 | int i; |
| 936 | int retval; |
| 937 | |
| 938 | if (!mips_linux_read_watch_registers (0)) |
| 939 | return -1; |
| 940 | |
| 941 | if (len <= 0) |
| 942 | return -1; |
| 943 | |
| 944 | regs = watch_readback; |
| 945 | /* Add the current watches. */ |
| 946 | populate_regs_from_watches (®s); |
| 947 | |
| 948 | /* Now try to add the new watch. */ |
| 949 | if (!try_one_watch (®s, addr, len, type_to_irw (type))) |
| 950 | return -1; |
| 951 | |
| 952 | /* It fit. Stick it on the end of the list. */ |
| 953 | new_watch = (struct mips_watchpoint *) |
| 954 | xmalloc (sizeof (struct mips_watchpoint)); |
| 955 | new_watch->addr = addr; |
| 956 | new_watch->len = len; |
| 957 | new_watch->type = type; |
| 958 | new_watch->next = NULL; |
| 959 | |
| 960 | pw = ¤t_watches; |
| 961 | while (*pw != NULL) |
| 962 | pw = &(*pw)->next; |
| 963 | *pw = new_watch; |
| 964 | |
| 965 | watch_mirror = regs; |
| 966 | retval = write_watchpoint_regs (); |
| 967 | |
| 968 | if (maint_show_dr) |
| 969 | mips_show_dr ("insert_watchpoint", addr, len, type); |
| 970 | |
| 971 | return retval; |
| 972 | } |
| 973 | |
| 974 | /* Target to_remove_watchpoint implementation. Try to remove a watch. |
| 975 | Return zero on success. */ |
| 976 | |
| 977 | static int |
| 978 | mips_linux_remove_watchpoint (CORE_ADDR addr, int len, int type) |
| 979 | { |
| 980 | int retval; |
| 981 | int deleted_one; |
| 982 | |
| 983 | struct mips_watchpoint **pw; |
| 984 | struct mips_watchpoint *w; |
| 985 | |
| 986 | /* Search for a known watch that matches. Then unlink and free |
| 987 | it. */ |
| 988 | deleted_one = 0; |
| 989 | pw = ¤t_watches; |
| 990 | while ((w = *pw)) |
| 991 | { |
| 992 | if (w->addr == addr && w->len == len && w->type == type) |
| 993 | { |
| 994 | *pw = w->next; |
| 995 | xfree (w); |
| 996 | deleted_one = 1; |
| 997 | break; |
| 998 | } |
| 999 | pw = &(w->next); |
| 1000 | } |
| 1001 | |
| 1002 | if (!deleted_one) |
| 1003 | return -1; /* We don't know about it, fail doing nothing. */ |
| 1004 | |
| 1005 | /* At this point watch_readback is known to be valid because we |
| 1006 | could not have added the watch without reading it. */ |
| 1007 | gdb_assert (watch_readback_valid == 1); |
| 1008 | |
| 1009 | watch_mirror = watch_readback; |
| 1010 | populate_regs_from_watches (&watch_mirror); |
| 1011 | |
| 1012 | retval = write_watchpoint_regs (); |
| 1013 | |
| 1014 | if (maint_show_dr) |
| 1015 | mips_show_dr ("remove_watchpoint", addr, len, type); |
| 1016 | |
| 1017 | return retval; |
| 1018 | } |
| 1019 | |
| 1020 | /* Target to_close implementation. Free any watches and call the |
| 1021 | super implementation. */ |
| 1022 | |
| 1023 | static void |
| 1024 | mips_linux_close (int quitting) |
| 1025 | { |
| 1026 | struct mips_watchpoint *w; |
| 1027 | struct mips_watchpoint *nw; |
| 1028 | |
| 1029 | /* Clean out the current_watches list. */ |
| 1030 | w = current_watches; |
| 1031 | while (w) |
| 1032 | { |
| 1033 | nw = w->next; |
| 1034 | xfree (w); |
| 1035 | w = nw; |
| 1036 | } |
| 1037 | current_watches = NULL; |
| 1038 | |
| 1039 | if (super_close) |
| 1040 | super_close (quitting); |
| 1041 | } |
| 1042 | |
| 1043 | void _initialize_mips_linux_nat (void); |
| 1044 | |
| 1045 | void |
| 1046 | _initialize_mips_linux_nat (void) |
| 1047 | { |
| 1048 | struct target_ops *t; |
| 1049 | |
| 1050 | add_setshow_boolean_cmd ("show-debug-regs", class_maintenance, |
| 1051 | &maint_show_dr, _("\ |
| 1052 | Set whether to show variables that mirror the mips debug registers."), _("\ |
| 1053 | Show whether to show variables that mirror the mips debug registers."), _("\ |
| 1054 | Use \"on\" to enable, \"off\" to disable.\n\ |
| 1055 | If enabled, the debug registers values are shown when GDB inserts\n\ |
| 1056 | or removes a hardware breakpoint or watchpoint, and when the inferior\n\ |
| 1057 | triggers a breakpoint or watchpoint."), |
| 1058 | NULL, |
| 1059 | NULL, |
| 1060 | &maintenance_set_cmdlist, |
| 1061 | &maintenance_show_cmdlist); |
| 1062 | |
| 1063 | t = linux_trad_target (mips_linux_register_u_offset); |
| 1064 | |
| 1065 | super_close = t->to_close; |
| 1066 | t->to_close = mips_linux_close; |
| 1067 | |
| 1068 | super_fetch_registers = t->to_fetch_registers; |
| 1069 | super_store_registers = t->to_store_registers; |
| 1070 | |
| 1071 | t->to_fetch_registers = mips64_linux_fetch_registers; |
| 1072 | t->to_store_registers = mips64_linux_store_registers; |
| 1073 | |
| 1074 | t->to_can_use_hw_breakpoint = mips_linux_can_use_hw_breakpoint; |
| 1075 | t->to_remove_watchpoint = mips_linux_remove_watchpoint; |
| 1076 | t->to_insert_watchpoint = mips_linux_insert_watchpoint; |
| 1077 | t->to_stopped_by_watchpoint = mips_linux_stopped_by_watchpoint; |
| 1078 | t->to_stopped_data_address = mips_linux_stopped_data_address; |
| 1079 | t->to_region_ok_for_hw_watchpoint = mips_linux_region_ok_for_hw_watchpoint; |
| 1080 | |
| 1081 | t->to_read_description = mips_linux_read_description; |
| 1082 | |
| 1083 | linux_nat_add_target (t); |
| 1084 | linux_nat_set_new_thread (t, mips_linux_new_thread); |
| 1085 | |
| 1086 | /* Initialize the standard target descriptions. */ |
| 1087 | initialize_tdesc_mips_linux (); |
| 1088 | initialize_tdesc_mips64_linux (); |
| 1089 | } |