| 1 | /* GNU/Linux on ARM native support. |
| 2 | Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009, |
| 3 | 2010, 2011 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 "inferior.h" |
| 22 | #include "gdbcore.h" |
| 23 | #include "gdb_string.h" |
| 24 | #include "regcache.h" |
| 25 | #include "target.h" |
| 26 | #include "linux-nat.h" |
| 27 | #include "target-descriptions.h" |
| 28 | #include "auxv.h" |
| 29 | #include "observer.h" |
| 30 | #include "gdbthread.h" |
| 31 | |
| 32 | #include "arm-tdep.h" |
| 33 | #include "arm-linux-tdep.h" |
| 34 | |
| 35 | #include <elf/common.h> |
| 36 | #include <sys/user.h> |
| 37 | #include <sys/ptrace.h> |
| 38 | #include <sys/utsname.h> |
| 39 | #include <sys/procfs.h> |
| 40 | |
| 41 | /* Prototypes for supply_gregset etc. */ |
| 42 | #include "gregset.h" |
| 43 | |
| 44 | /* Defines ps_err_e, struct ps_prochandle. */ |
| 45 | #include "gdb_proc_service.h" |
| 46 | |
| 47 | #ifndef PTRACE_GET_THREAD_AREA |
| 48 | #define PTRACE_GET_THREAD_AREA 22 |
| 49 | #endif |
| 50 | |
| 51 | #ifndef PTRACE_GETWMMXREGS |
| 52 | #define PTRACE_GETWMMXREGS 18 |
| 53 | #define PTRACE_SETWMMXREGS 19 |
| 54 | #endif |
| 55 | |
| 56 | #ifndef PTRACE_GETVFPREGS |
| 57 | #define PTRACE_GETVFPREGS 27 |
| 58 | #define PTRACE_SETVFPREGS 28 |
| 59 | #endif |
| 60 | |
| 61 | #ifndef PTRACE_GETHBPREGS |
| 62 | #define PTRACE_GETHBPREGS 29 |
| 63 | #define PTRACE_SETHBPREGS 30 |
| 64 | #endif |
| 65 | |
| 66 | /* A flag for whether the WMMX registers are available. */ |
| 67 | static int arm_linux_has_wmmx_registers; |
| 68 | |
| 69 | /* The number of 64-bit VFP registers we have (expect this to be 0, |
| 70 | 16, or 32). */ |
| 71 | static int arm_linux_vfp_register_count; |
| 72 | |
| 73 | extern int arm_apcs_32; |
| 74 | |
| 75 | /* The following variables are used to determine the version of the |
| 76 | underlying GNU/Linux operating system. Examples: |
| 77 | |
| 78 | GNU/Linux 2.0.35 GNU/Linux 2.2.12 |
| 79 | os_version = 0x00020023 os_version = 0x0002020c |
| 80 | os_major = 2 os_major = 2 |
| 81 | os_minor = 0 os_minor = 2 |
| 82 | os_release = 35 os_release = 12 |
| 83 | |
| 84 | Note: os_version = (os_major << 16) | (os_minor << 8) | os_release |
| 85 | |
| 86 | These are initialized using get_linux_version() from |
| 87 | _initialize_arm_linux_nat(). */ |
| 88 | |
| 89 | static unsigned int os_version, os_major, os_minor, os_release; |
| 90 | |
| 91 | /* On GNU/Linux, threads are implemented as pseudo-processes, in which |
| 92 | case we may be tracing more than one process at a time. In that |
| 93 | case, inferior_ptid will contain the main process ID and the |
| 94 | individual thread (process) ID. get_thread_id () is used to get |
| 95 | the thread id if it's available, and the process id otherwise. */ |
| 96 | |
| 97 | int |
| 98 | get_thread_id (ptid_t ptid) |
| 99 | { |
| 100 | int tid = TIDGET (ptid); |
| 101 | if (0 == tid) |
| 102 | tid = PIDGET (ptid); |
| 103 | return tid; |
| 104 | } |
| 105 | |
| 106 | #define GET_THREAD_ID(PTID) get_thread_id (PTID) |
| 107 | |
| 108 | /* Get the value of a particular register from the floating point |
| 109 | state of the process and store it into regcache. */ |
| 110 | |
| 111 | static void |
| 112 | fetch_fpregister (struct regcache *regcache, int regno) |
| 113 | { |
| 114 | int ret, tid; |
| 115 | gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| 116 | |
| 117 | /* Get the thread id for the ptrace call. */ |
| 118 | tid = GET_THREAD_ID (inferior_ptid); |
| 119 | |
| 120 | /* Read the floating point state. */ |
| 121 | ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| 122 | if (ret < 0) |
| 123 | { |
| 124 | warning (_("Unable to fetch floating point register.")); |
| 125 | return; |
| 126 | } |
| 127 | |
| 128 | /* Fetch fpsr. */ |
| 129 | if (ARM_FPS_REGNUM == regno) |
| 130 | regcache_raw_supply (regcache, ARM_FPS_REGNUM, |
| 131 | fp + NWFPE_FPSR_OFFSET); |
| 132 | |
| 133 | /* Fetch the floating point register. */ |
| 134 | if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM) |
| 135 | supply_nwfpe_register (regcache, regno, fp); |
| 136 | } |
| 137 | |
| 138 | /* Get the whole floating point state of the process and store it |
| 139 | into regcache. */ |
| 140 | |
| 141 | static void |
| 142 | fetch_fpregs (struct regcache *regcache) |
| 143 | { |
| 144 | int ret, regno, tid; |
| 145 | gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| 146 | |
| 147 | /* Get the thread id for the ptrace call. */ |
| 148 | tid = GET_THREAD_ID (inferior_ptid); |
| 149 | |
| 150 | /* Read the floating point state. */ |
| 151 | ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| 152 | if (ret < 0) |
| 153 | { |
| 154 | warning (_("Unable to fetch the floating point registers.")); |
| 155 | return; |
| 156 | } |
| 157 | |
| 158 | /* Fetch fpsr. */ |
| 159 | regcache_raw_supply (regcache, ARM_FPS_REGNUM, |
| 160 | fp + NWFPE_FPSR_OFFSET); |
| 161 | |
| 162 | /* Fetch the floating point registers. */ |
| 163 | for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++) |
| 164 | supply_nwfpe_register (regcache, regno, fp); |
| 165 | } |
| 166 | |
| 167 | /* Save a particular register into the floating point state of the |
| 168 | process using the contents from regcache. */ |
| 169 | |
| 170 | static void |
| 171 | store_fpregister (const struct regcache *regcache, int regno) |
| 172 | { |
| 173 | int ret, tid; |
| 174 | gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| 175 | |
| 176 | /* Get the thread id for the ptrace call. */ |
| 177 | tid = GET_THREAD_ID (inferior_ptid); |
| 178 | |
| 179 | /* Read the floating point state. */ |
| 180 | ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| 181 | if (ret < 0) |
| 182 | { |
| 183 | warning (_("Unable to fetch the floating point registers.")); |
| 184 | return; |
| 185 | } |
| 186 | |
| 187 | /* Store fpsr. */ |
| 188 | if (ARM_FPS_REGNUM == regno |
| 189 | && REG_VALID == regcache_register_status (regcache, ARM_FPS_REGNUM)) |
| 190 | regcache_raw_collect (regcache, ARM_FPS_REGNUM, fp + NWFPE_FPSR_OFFSET); |
| 191 | |
| 192 | /* Store the floating point register. */ |
| 193 | if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM) |
| 194 | collect_nwfpe_register (regcache, regno, fp); |
| 195 | |
| 196 | ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp); |
| 197 | if (ret < 0) |
| 198 | { |
| 199 | warning (_("Unable to store floating point register.")); |
| 200 | return; |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | /* Save the whole floating point state of the process using |
| 205 | the contents from regcache. */ |
| 206 | |
| 207 | static void |
| 208 | store_fpregs (const struct regcache *regcache) |
| 209 | { |
| 210 | int ret, regno, tid; |
| 211 | gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| 212 | |
| 213 | /* Get the thread id for the ptrace call. */ |
| 214 | tid = GET_THREAD_ID (inferior_ptid); |
| 215 | |
| 216 | /* Read the floating point state. */ |
| 217 | ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| 218 | if (ret < 0) |
| 219 | { |
| 220 | warning (_("Unable to fetch the floating point registers.")); |
| 221 | return; |
| 222 | } |
| 223 | |
| 224 | /* Store fpsr. */ |
| 225 | if (REG_VALID == regcache_register_status (regcache, ARM_FPS_REGNUM)) |
| 226 | regcache_raw_collect (regcache, ARM_FPS_REGNUM, fp + NWFPE_FPSR_OFFSET); |
| 227 | |
| 228 | /* Store the floating point registers. */ |
| 229 | for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++) |
| 230 | if (REG_VALID == regcache_register_status (regcache, regno)) |
| 231 | collect_nwfpe_register (regcache, regno, fp); |
| 232 | |
| 233 | ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp); |
| 234 | if (ret < 0) |
| 235 | { |
| 236 | warning (_("Unable to store floating point registers.")); |
| 237 | return; |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | /* Fetch a general register of the process and store into |
| 242 | regcache. */ |
| 243 | |
| 244 | static void |
| 245 | fetch_register (struct regcache *regcache, int regno) |
| 246 | { |
| 247 | int ret, tid; |
| 248 | elf_gregset_t regs; |
| 249 | |
| 250 | /* Get the thread id for the ptrace call. */ |
| 251 | tid = GET_THREAD_ID (inferior_ptid); |
| 252 | |
| 253 | ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| 254 | if (ret < 0) |
| 255 | { |
| 256 | warning (_("Unable to fetch general register.")); |
| 257 | return; |
| 258 | } |
| 259 | |
| 260 | if (regno >= ARM_A1_REGNUM && regno < ARM_PC_REGNUM) |
| 261 | regcache_raw_supply (regcache, regno, (char *) ®s[regno]); |
| 262 | |
| 263 | if (ARM_PS_REGNUM == regno) |
| 264 | { |
| 265 | if (arm_apcs_32) |
| 266 | regcache_raw_supply (regcache, ARM_PS_REGNUM, |
| 267 | (char *) ®s[ARM_CPSR_GREGNUM]); |
| 268 | else |
| 269 | regcache_raw_supply (regcache, ARM_PS_REGNUM, |
| 270 | (char *) ®s[ARM_PC_REGNUM]); |
| 271 | } |
| 272 | |
| 273 | if (ARM_PC_REGNUM == regno) |
| 274 | { |
| 275 | regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove |
| 276 | (get_regcache_arch (regcache), |
| 277 | regs[ARM_PC_REGNUM]); |
| 278 | regcache_raw_supply (regcache, ARM_PC_REGNUM, |
| 279 | (char *) ®s[ARM_PC_REGNUM]); |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | /* Fetch all general registers of the process and store into |
| 284 | regcache. */ |
| 285 | |
| 286 | static void |
| 287 | fetch_regs (struct regcache *regcache) |
| 288 | { |
| 289 | int ret, regno, tid; |
| 290 | elf_gregset_t regs; |
| 291 | |
| 292 | /* Get the thread id for the ptrace call. */ |
| 293 | tid = GET_THREAD_ID (inferior_ptid); |
| 294 | |
| 295 | ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| 296 | if (ret < 0) |
| 297 | { |
| 298 | warning (_("Unable to fetch general registers.")); |
| 299 | return; |
| 300 | } |
| 301 | |
| 302 | for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++) |
| 303 | regcache_raw_supply (regcache, regno, (char *) ®s[regno]); |
| 304 | |
| 305 | if (arm_apcs_32) |
| 306 | regcache_raw_supply (regcache, ARM_PS_REGNUM, |
| 307 | (char *) ®s[ARM_CPSR_GREGNUM]); |
| 308 | else |
| 309 | regcache_raw_supply (regcache, ARM_PS_REGNUM, |
| 310 | (char *) ®s[ARM_PC_REGNUM]); |
| 311 | |
| 312 | regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove |
| 313 | (get_regcache_arch (regcache), regs[ARM_PC_REGNUM]); |
| 314 | regcache_raw_supply (regcache, ARM_PC_REGNUM, |
| 315 | (char *) ®s[ARM_PC_REGNUM]); |
| 316 | } |
| 317 | |
| 318 | /* Store all general registers of the process from the values in |
| 319 | regcache. */ |
| 320 | |
| 321 | static void |
| 322 | store_register (const struct regcache *regcache, int regno) |
| 323 | { |
| 324 | int ret, tid; |
| 325 | elf_gregset_t regs; |
| 326 | |
| 327 | if (REG_VALID != regcache_register_status (regcache, regno)) |
| 328 | return; |
| 329 | |
| 330 | /* Get the thread id for the ptrace call. */ |
| 331 | tid = GET_THREAD_ID (inferior_ptid); |
| 332 | |
| 333 | /* Get the general registers from the process. */ |
| 334 | ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| 335 | if (ret < 0) |
| 336 | { |
| 337 | warning (_("Unable to fetch general registers.")); |
| 338 | return; |
| 339 | } |
| 340 | |
| 341 | if (regno >= ARM_A1_REGNUM && regno <= ARM_PC_REGNUM) |
| 342 | regcache_raw_collect (regcache, regno, (char *) ®s[regno]); |
| 343 | else if (arm_apcs_32 && regno == ARM_PS_REGNUM) |
| 344 | regcache_raw_collect (regcache, regno, |
| 345 | (char *) ®s[ARM_CPSR_GREGNUM]); |
| 346 | else if (!arm_apcs_32 && regno == ARM_PS_REGNUM) |
| 347 | regcache_raw_collect (regcache, ARM_PC_REGNUM, |
| 348 | (char *) ®s[ARM_PC_REGNUM]); |
| 349 | |
| 350 | ret = ptrace (PTRACE_SETREGS, tid, 0, ®s); |
| 351 | if (ret < 0) |
| 352 | { |
| 353 | warning (_("Unable to store general register.")); |
| 354 | return; |
| 355 | } |
| 356 | } |
| 357 | |
| 358 | static void |
| 359 | store_regs (const struct regcache *regcache) |
| 360 | { |
| 361 | int ret, regno, tid; |
| 362 | elf_gregset_t regs; |
| 363 | |
| 364 | /* Get the thread id for the ptrace call. */ |
| 365 | tid = GET_THREAD_ID (inferior_ptid); |
| 366 | |
| 367 | /* Fetch the general registers. */ |
| 368 | ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| 369 | if (ret < 0) |
| 370 | { |
| 371 | warning (_("Unable to fetch general registers.")); |
| 372 | return; |
| 373 | } |
| 374 | |
| 375 | for (regno = ARM_A1_REGNUM; regno <= ARM_PC_REGNUM; regno++) |
| 376 | { |
| 377 | if (REG_VALID == regcache_register_status (regcache, regno)) |
| 378 | regcache_raw_collect (regcache, regno, (char *) ®s[regno]); |
| 379 | } |
| 380 | |
| 381 | if (arm_apcs_32 && REG_VALID == regcache_register_status (regcache, ARM_PS_REGNUM)) |
| 382 | regcache_raw_collect (regcache, ARM_PS_REGNUM, |
| 383 | (char *) ®s[ARM_CPSR_GREGNUM]); |
| 384 | |
| 385 | ret = ptrace (PTRACE_SETREGS, tid, 0, ®s); |
| 386 | |
| 387 | if (ret < 0) |
| 388 | { |
| 389 | warning (_("Unable to store general registers.")); |
| 390 | return; |
| 391 | } |
| 392 | } |
| 393 | |
| 394 | /* Fetch all WMMX registers of the process and store into |
| 395 | regcache. */ |
| 396 | |
| 397 | #define IWMMXT_REGS_SIZE (16 * 8 + 6 * 4) |
| 398 | |
| 399 | static void |
| 400 | fetch_wmmx_regs (struct regcache *regcache) |
| 401 | { |
| 402 | char regbuf[IWMMXT_REGS_SIZE]; |
| 403 | int ret, regno, tid; |
| 404 | |
| 405 | /* Get the thread id for the ptrace call. */ |
| 406 | tid = GET_THREAD_ID (inferior_ptid); |
| 407 | |
| 408 | ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf); |
| 409 | if (ret < 0) |
| 410 | { |
| 411 | warning (_("Unable to fetch WMMX registers.")); |
| 412 | return; |
| 413 | } |
| 414 | |
| 415 | for (regno = 0; regno < 16; regno++) |
| 416 | regcache_raw_supply (regcache, regno + ARM_WR0_REGNUM, |
| 417 | ®buf[regno * 8]); |
| 418 | |
| 419 | for (regno = 0; regno < 2; regno++) |
| 420 | regcache_raw_supply (regcache, regno + ARM_WCSSF_REGNUM, |
| 421 | ®buf[16 * 8 + regno * 4]); |
| 422 | |
| 423 | for (regno = 0; regno < 4; regno++) |
| 424 | regcache_raw_supply (regcache, regno + ARM_WCGR0_REGNUM, |
| 425 | ®buf[16 * 8 + 2 * 4 + regno * 4]); |
| 426 | } |
| 427 | |
| 428 | static void |
| 429 | store_wmmx_regs (const struct regcache *regcache) |
| 430 | { |
| 431 | char regbuf[IWMMXT_REGS_SIZE]; |
| 432 | int ret, regno, tid; |
| 433 | |
| 434 | /* Get the thread id for the ptrace call. */ |
| 435 | tid = GET_THREAD_ID (inferior_ptid); |
| 436 | |
| 437 | ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf); |
| 438 | if (ret < 0) |
| 439 | { |
| 440 | warning (_("Unable to fetch WMMX registers.")); |
| 441 | return; |
| 442 | } |
| 443 | |
| 444 | for (regno = 0; regno < 16; regno++) |
| 445 | if (REG_VALID == regcache_register_status (regcache, |
| 446 | regno + ARM_WR0_REGNUM)) |
| 447 | regcache_raw_collect (regcache, regno + ARM_WR0_REGNUM, |
| 448 | ®buf[regno * 8]); |
| 449 | |
| 450 | for (regno = 0; regno < 2; regno++) |
| 451 | if (REG_VALID == regcache_register_status (regcache, |
| 452 | regno + ARM_WCSSF_REGNUM)) |
| 453 | regcache_raw_collect (regcache, regno + ARM_WCSSF_REGNUM, |
| 454 | ®buf[16 * 8 + regno * 4]); |
| 455 | |
| 456 | for (regno = 0; regno < 4; regno++) |
| 457 | if (REG_VALID == regcache_register_status (regcache, |
| 458 | regno + ARM_WCGR0_REGNUM)) |
| 459 | regcache_raw_collect (regcache, regno + ARM_WCGR0_REGNUM, |
| 460 | ®buf[16 * 8 + 2 * 4 + regno * 4]); |
| 461 | |
| 462 | ret = ptrace (PTRACE_SETWMMXREGS, tid, 0, regbuf); |
| 463 | |
| 464 | if (ret < 0) |
| 465 | { |
| 466 | warning (_("Unable to store WMMX registers.")); |
| 467 | return; |
| 468 | } |
| 469 | } |
| 470 | |
| 471 | /* Fetch and store VFP Registers. The kernel object has space for 32 |
| 472 | 64-bit registers, and the FPSCR. This is even when on a VFPv2 or |
| 473 | VFPv3D16 target. */ |
| 474 | #define VFP_REGS_SIZE (32 * 8 + 4) |
| 475 | |
| 476 | static void |
| 477 | fetch_vfp_regs (struct regcache *regcache) |
| 478 | { |
| 479 | char regbuf[VFP_REGS_SIZE]; |
| 480 | int ret, regno, tid; |
| 481 | |
| 482 | /* Get the thread id for the ptrace call. */ |
| 483 | tid = GET_THREAD_ID (inferior_ptid); |
| 484 | |
| 485 | ret = ptrace (PTRACE_GETVFPREGS, tid, 0, regbuf); |
| 486 | if (ret < 0) |
| 487 | { |
| 488 | warning (_("Unable to fetch VFP registers.")); |
| 489 | return; |
| 490 | } |
| 491 | |
| 492 | for (regno = 0; regno < arm_linux_vfp_register_count; regno++) |
| 493 | regcache_raw_supply (regcache, regno + ARM_D0_REGNUM, |
| 494 | (char *) regbuf + regno * 8); |
| 495 | |
| 496 | regcache_raw_supply (regcache, ARM_FPSCR_REGNUM, |
| 497 | (char *) regbuf + 32 * 8); |
| 498 | } |
| 499 | |
| 500 | static void |
| 501 | store_vfp_regs (const struct regcache *regcache) |
| 502 | { |
| 503 | char regbuf[VFP_REGS_SIZE]; |
| 504 | int ret, regno, tid; |
| 505 | |
| 506 | /* Get the thread id for the ptrace call. */ |
| 507 | tid = GET_THREAD_ID (inferior_ptid); |
| 508 | |
| 509 | ret = ptrace (PTRACE_GETVFPREGS, tid, 0, regbuf); |
| 510 | if (ret < 0) |
| 511 | { |
| 512 | warning (_("Unable to fetch VFP registers (for update).")); |
| 513 | return; |
| 514 | } |
| 515 | |
| 516 | for (regno = 0; regno < arm_linux_vfp_register_count; regno++) |
| 517 | regcache_raw_collect (regcache, regno + ARM_D0_REGNUM, |
| 518 | (char *) regbuf + regno * 8); |
| 519 | |
| 520 | regcache_raw_collect (regcache, ARM_FPSCR_REGNUM, |
| 521 | (char *) regbuf + 32 * 8); |
| 522 | |
| 523 | ret = ptrace (PTRACE_SETVFPREGS, tid, 0, regbuf); |
| 524 | |
| 525 | if (ret < 0) |
| 526 | { |
| 527 | warning (_("Unable to store VFP registers.")); |
| 528 | return; |
| 529 | } |
| 530 | } |
| 531 | |
| 532 | /* Fetch registers from the child process. Fetch all registers if |
| 533 | regno == -1, otherwise fetch all general registers or all floating |
| 534 | point registers depending upon the value of regno. */ |
| 535 | |
| 536 | static void |
| 537 | arm_linux_fetch_inferior_registers (struct target_ops *ops, |
| 538 | struct regcache *regcache, int regno) |
| 539 | { |
| 540 | if (-1 == regno) |
| 541 | { |
| 542 | fetch_regs (regcache); |
| 543 | fetch_fpregs (regcache); |
| 544 | if (arm_linux_has_wmmx_registers) |
| 545 | fetch_wmmx_regs (regcache); |
| 546 | if (arm_linux_vfp_register_count > 0) |
| 547 | fetch_vfp_regs (regcache); |
| 548 | } |
| 549 | else |
| 550 | { |
| 551 | if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM) |
| 552 | fetch_register (regcache, regno); |
| 553 | else if (regno >= ARM_F0_REGNUM && regno <= ARM_FPS_REGNUM) |
| 554 | fetch_fpregister (regcache, regno); |
| 555 | else if (arm_linux_has_wmmx_registers |
| 556 | && regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM) |
| 557 | fetch_wmmx_regs (regcache); |
| 558 | else if (arm_linux_vfp_register_count > 0 |
| 559 | && regno >= ARM_D0_REGNUM |
| 560 | && regno <= ARM_D0_REGNUM + arm_linux_vfp_register_count) |
| 561 | fetch_vfp_regs (regcache); |
| 562 | } |
| 563 | } |
| 564 | |
| 565 | /* Store registers back into the inferior. Store all registers if |
| 566 | regno == -1, otherwise store all general registers or all floating |
| 567 | point registers depending upon the value of regno. */ |
| 568 | |
| 569 | static void |
| 570 | arm_linux_store_inferior_registers (struct target_ops *ops, |
| 571 | struct regcache *regcache, int regno) |
| 572 | { |
| 573 | if (-1 == regno) |
| 574 | { |
| 575 | store_regs (regcache); |
| 576 | store_fpregs (regcache); |
| 577 | if (arm_linux_has_wmmx_registers) |
| 578 | store_wmmx_regs (regcache); |
| 579 | if (arm_linux_vfp_register_count > 0) |
| 580 | store_vfp_regs (regcache); |
| 581 | } |
| 582 | else |
| 583 | { |
| 584 | if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM) |
| 585 | store_register (regcache, regno); |
| 586 | else if ((regno >= ARM_F0_REGNUM) && (regno <= ARM_FPS_REGNUM)) |
| 587 | store_fpregister (regcache, regno); |
| 588 | else if (arm_linux_has_wmmx_registers |
| 589 | && regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM) |
| 590 | store_wmmx_regs (regcache); |
| 591 | else if (arm_linux_vfp_register_count > 0 |
| 592 | && regno >= ARM_D0_REGNUM |
| 593 | && regno <= ARM_D0_REGNUM + arm_linux_vfp_register_count) |
| 594 | store_vfp_regs (regcache); |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | /* Wrapper functions for the standard regset handling, used by |
| 599 | thread debugging. */ |
| 600 | |
| 601 | void |
| 602 | fill_gregset (const struct regcache *regcache, |
| 603 | gdb_gregset_t *gregsetp, int regno) |
| 604 | { |
| 605 | arm_linux_collect_gregset (NULL, regcache, regno, gregsetp, 0); |
| 606 | } |
| 607 | |
| 608 | void |
| 609 | supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) |
| 610 | { |
| 611 | arm_linux_supply_gregset (NULL, regcache, -1, gregsetp, 0); |
| 612 | } |
| 613 | |
| 614 | void |
| 615 | fill_fpregset (const struct regcache *regcache, |
| 616 | gdb_fpregset_t *fpregsetp, int regno) |
| 617 | { |
| 618 | arm_linux_collect_nwfpe (NULL, regcache, regno, fpregsetp, 0); |
| 619 | } |
| 620 | |
| 621 | /* Fill GDB's register array with the floating-point register values |
| 622 | in *fpregsetp. */ |
| 623 | |
| 624 | void |
| 625 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp) |
| 626 | { |
| 627 | arm_linux_supply_nwfpe (NULL, regcache, -1, fpregsetp, 0); |
| 628 | } |
| 629 | |
| 630 | /* Fetch the thread-local storage pointer for libthread_db. */ |
| 631 | |
| 632 | ps_err_e |
| 633 | ps_get_thread_area (const struct ps_prochandle *ph, |
| 634 | lwpid_t lwpid, int idx, void **base) |
| 635 | { |
| 636 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) |
| 637 | return PS_ERR; |
| 638 | |
| 639 | /* IDX is the bias from the thread pointer to the beginning of the |
| 640 | thread descriptor. It has to be subtracted due to implementation |
| 641 | quirks in libthread_db. */ |
| 642 | *base = (void *) ((char *)*base - idx); |
| 643 | |
| 644 | return PS_OK; |
| 645 | } |
| 646 | |
| 647 | static unsigned int |
| 648 | get_linux_version (unsigned int *vmajor, |
| 649 | unsigned int *vminor, |
| 650 | unsigned int *vrelease) |
| 651 | { |
| 652 | struct utsname info; |
| 653 | char *pmajor, *pminor, *prelease, *tail; |
| 654 | |
| 655 | if (-1 == uname (&info)) |
| 656 | { |
| 657 | warning (_("Unable to determine GNU/Linux version.")); |
| 658 | return -1; |
| 659 | } |
| 660 | |
| 661 | pmajor = strtok (info.release, "."); |
| 662 | pminor = strtok (NULL, "."); |
| 663 | prelease = strtok (NULL, "."); |
| 664 | |
| 665 | *vmajor = (unsigned int) strtoul (pmajor, &tail, 0); |
| 666 | *vminor = (unsigned int) strtoul (pminor, &tail, 0); |
| 667 | *vrelease = (unsigned int) strtoul (prelease, &tail, 0); |
| 668 | |
| 669 | return ((*vmajor << 16) | (*vminor << 8) | *vrelease); |
| 670 | } |
| 671 | |
| 672 | static const struct target_desc * |
| 673 | arm_linux_read_description (struct target_ops *ops) |
| 674 | { |
| 675 | CORE_ADDR arm_hwcap = 0; |
| 676 | arm_linux_has_wmmx_registers = 0; |
| 677 | arm_linux_vfp_register_count = 0; |
| 678 | |
| 679 | if (target_auxv_search (ops, AT_HWCAP, &arm_hwcap) != 1) |
| 680 | { |
| 681 | return NULL; |
| 682 | } |
| 683 | |
| 684 | if (arm_hwcap & HWCAP_IWMMXT) |
| 685 | { |
| 686 | arm_linux_has_wmmx_registers = 1; |
| 687 | return tdesc_arm_with_iwmmxt; |
| 688 | } |
| 689 | |
| 690 | if (arm_hwcap & HWCAP_VFP) |
| 691 | { |
| 692 | int pid; |
| 693 | char *buf; |
| 694 | const struct target_desc * result = NULL; |
| 695 | |
| 696 | /* NEON implies VFPv3-D32 or no-VFP unit. Say that we only support |
| 697 | Neon with VFPv3-D32. */ |
| 698 | if (arm_hwcap & HWCAP_NEON) |
| 699 | { |
| 700 | arm_linux_vfp_register_count = 32; |
| 701 | result = tdesc_arm_with_neon; |
| 702 | } |
| 703 | else if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3) |
| 704 | { |
| 705 | arm_linux_vfp_register_count = 32; |
| 706 | result = tdesc_arm_with_vfpv3; |
| 707 | } |
| 708 | else |
| 709 | { |
| 710 | arm_linux_vfp_register_count = 16; |
| 711 | result = tdesc_arm_with_vfpv2; |
| 712 | } |
| 713 | |
| 714 | /* Now make sure that the kernel supports reading these |
| 715 | registers. Support was added in 2.6.30. */ |
| 716 | pid = GET_LWP (inferior_ptid); |
| 717 | errno = 0; |
| 718 | buf = alloca (VFP_REGS_SIZE); |
| 719 | if (ptrace (PTRACE_GETVFPREGS, pid, 0, buf) < 0 |
| 720 | && errno == EIO) |
| 721 | result = NULL; |
| 722 | |
| 723 | return result; |
| 724 | } |
| 725 | |
| 726 | return NULL; |
| 727 | } |
| 728 | |
| 729 | /* Information describing the hardware breakpoint capabilities. */ |
| 730 | struct arm_linux_hwbp_cap |
| 731 | { |
| 732 | gdb_byte arch; |
| 733 | gdb_byte max_wp_length; |
| 734 | gdb_byte wp_count; |
| 735 | gdb_byte bp_count; |
| 736 | }; |
| 737 | |
| 738 | /* Get hold of the Hardware Breakpoint information for the target we are |
| 739 | attached to. Returns NULL if the kernel doesn't support Hardware |
| 740 | breakpoints at all, or a pointer to the information structure. */ |
| 741 | static const struct arm_linux_hwbp_cap * |
| 742 | arm_linux_get_hwbp_cap (void) |
| 743 | { |
| 744 | /* The info structure we return. */ |
| 745 | static struct arm_linux_hwbp_cap info; |
| 746 | |
| 747 | /* Is INFO in a good state? -1 means that no attempt has been made to |
| 748 | initialize INFO; 0 means an attempt has been made, but it failed; 1 |
| 749 | means INFO is in an initialized state. */ |
| 750 | static int available = -1; |
| 751 | |
| 752 | if (available == -1) |
| 753 | { |
| 754 | int tid; |
| 755 | unsigned int val; |
| 756 | |
| 757 | tid = GET_THREAD_ID (inferior_ptid); |
| 758 | if (ptrace (PTRACE_GETHBPREGS, tid, 0, &val) < 0) |
| 759 | available = 0; |
| 760 | else |
| 761 | { |
| 762 | info.arch = (gdb_byte)((val >> 24) & 0xff); |
| 763 | info.max_wp_length = (gdb_byte)((val >> 16) & 0xff); |
| 764 | info.wp_count = (gdb_byte)((val >> 8) & 0xff); |
| 765 | info.bp_count = (gdb_byte)(val & 0xff); |
| 766 | available = (info.arch != 0); |
| 767 | } |
| 768 | } |
| 769 | |
| 770 | return available == 1 ? &info : NULL; |
| 771 | } |
| 772 | |
| 773 | /* How many hardware breakpoints are available? */ |
| 774 | static int |
| 775 | arm_linux_get_hw_breakpoint_count (void) |
| 776 | { |
| 777 | const struct arm_linux_hwbp_cap *cap = arm_linux_get_hwbp_cap (); |
| 778 | return cap != NULL ? cap->bp_count : 0; |
| 779 | } |
| 780 | |
| 781 | /* How many hardware watchpoints are available? */ |
| 782 | static int |
| 783 | arm_linux_get_hw_watchpoint_count (void) |
| 784 | { |
| 785 | const struct arm_linux_hwbp_cap *cap = arm_linux_get_hwbp_cap (); |
| 786 | return cap != NULL ? cap->wp_count : 0; |
| 787 | } |
| 788 | |
| 789 | /* Have we got a free break-/watch-point available for use? Returns -1 if |
| 790 | there is not an appropriate resource available, otherwise returns 1. */ |
| 791 | static int |
| 792 | arm_linux_can_use_hw_breakpoint (int type, int cnt, int ot) |
| 793 | { |
| 794 | if (type == bp_hardware_watchpoint || type == bp_read_watchpoint |
| 795 | || type == bp_access_watchpoint || type == bp_watchpoint) |
| 796 | { |
| 797 | if (cnt + ot > arm_linux_get_hw_watchpoint_count ()) |
| 798 | return -1; |
| 799 | } |
| 800 | else if (type == bp_hardware_breakpoint) |
| 801 | { |
| 802 | if (cnt > arm_linux_get_hw_breakpoint_count ()) |
| 803 | return -1; |
| 804 | } |
| 805 | else |
| 806 | gdb_assert (FALSE); |
| 807 | |
| 808 | return 1; |
| 809 | } |
| 810 | |
| 811 | /* Enum describing the different types of ARM hardware break-/watch-points. */ |
| 812 | typedef enum |
| 813 | { |
| 814 | arm_hwbp_break = 0, |
| 815 | arm_hwbp_load = 1, |
| 816 | arm_hwbp_store = 2, |
| 817 | arm_hwbp_access = 3 |
| 818 | } arm_hwbp_type; |
| 819 | |
| 820 | /* Type describing an ARM Hardware Breakpoint Control register value. */ |
| 821 | typedef unsigned int arm_hwbp_control_t; |
| 822 | |
| 823 | /* Structure used to keep track of hardware break-/watch-points. */ |
| 824 | struct arm_linux_hw_breakpoint |
| 825 | { |
| 826 | /* Address to break on, or being watched. */ |
| 827 | unsigned int address; |
| 828 | /* Control register for break-/watch- point. */ |
| 829 | arm_hwbp_control_t control; |
| 830 | }; |
| 831 | |
| 832 | /* Structure containing arrays of the break and watch points which are have |
| 833 | active in each thread. |
| 834 | |
| 835 | The Linux ptrace interface to hardware break-/watch-points presents the |
| 836 | values in a vector centred around 0 (which is used fo generic information). |
| 837 | Positive indicies refer to breakpoint addresses/control registers, negative |
| 838 | indices to watchpoint addresses/control registers. |
| 839 | |
| 840 | The Linux vector is indexed as follows: |
| 841 | -((i << 1) + 2): Control register for watchpoint i. |
| 842 | -((i << 1) + 1): Address register for watchpoint i. |
| 843 | 0: Information register. |
| 844 | ((i << 1) + 1): Address register for breakpoint i. |
| 845 | ((i << 1) + 2): Control register for breakpoint i. |
| 846 | |
| 847 | This structure is used as a per-thread cache of the state stored by the |
| 848 | kernel, so that we don't need to keep calling into the kernel to find a |
| 849 | free breakpoint. |
| 850 | |
| 851 | We treat break-/watch-points with their enable bit clear as being deleted. |
| 852 | */ |
| 853 | typedef struct arm_linux_thread_points |
| 854 | { |
| 855 | /* Thread ID. */ |
| 856 | int tid; |
| 857 | /* Breakpoints for thread. */ |
| 858 | struct arm_linux_hw_breakpoint *bpts; |
| 859 | /* Watchpoint for threads. */ |
| 860 | struct arm_linux_hw_breakpoint *wpts; |
| 861 | } *arm_linux_thread_points_p; |
| 862 | DEF_VEC_P (arm_linux_thread_points_p); |
| 863 | |
| 864 | /* Vector of hardware breakpoints for each thread. */ |
| 865 | VEC(arm_linux_thread_points_p) *arm_threads = NULL; |
| 866 | |
| 867 | /* Find the list of hardware break-/watch-points for a thread with id TID. |
| 868 | If no list exists for TID we return NULL if ALLOC_NEW is 0, otherwise we |
| 869 | create a new list and return that. */ |
| 870 | static struct arm_linux_thread_points * |
| 871 | arm_linux_find_breakpoints_by_tid (int tid, int alloc_new) |
| 872 | { |
| 873 | int i; |
| 874 | struct arm_linux_thread_points *t; |
| 875 | |
| 876 | for (i = 0; VEC_iterate (arm_linux_thread_points_p, arm_threads, i, t); ++i) |
| 877 | { |
| 878 | if (t->tid == tid) |
| 879 | return t; |
| 880 | } |
| 881 | |
| 882 | t = NULL; |
| 883 | |
| 884 | if (alloc_new) |
| 885 | { |
| 886 | t = xmalloc (sizeof (struct arm_linux_thread_points)); |
| 887 | t->tid = tid; |
| 888 | t->bpts = xzalloc (arm_linux_get_hw_breakpoint_count () |
| 889 | * sizeof (struct arm_linux_hw_breakpoint)); |
| 890 | t->wpts = xzalloc (arm_linux_get_hw_watchpoint_count () |
| 891 | * sizeof (struct arm_linux_hw_breakpoint)); |
| 892 | VEC_safe_push (arm_linux_thread_points_p, arm_threads, t); |
| 893 | } |
| 894 | |
| 895 | return t; |
| 896 | } |
| 897 | |
| 898 | /* Initialize an ARM hardware break-/watch-point control register value. |
| 899 | BYTE_ADDRESS_SELECT is the mask of bytes to trigger on; HWBP_TYPE is the |
| 900 | type of break-/watch-point; ENABLE indicates whether the point is enabled. |
| 901 | */ |
| 902 | static arm_hwbp_control_t |
| 903 | arm_hwbp_control_initialize (unsigned byte_address_select, |
| 904 | arm_hwbp_type hwbp_type, |
| 905 | int enable) |
| 906 | { |
| 907 | gdb_assert ((byte_address_select & ~0xffU) == 0); |
| 908 | gdb_assert (hwbp_type != arm_hwbp_break |
| 909 | || ((byte_address_select & 0xfU) != 0)); |
| 910 | |
| 911 | return (byte_address_select << 5) | (hwbp_type << 3) | (3 << 1) | enable; |
| 912 | } |
| 913 | |
| 914 | /* Does the breakpoint control value CONTROL have the enable bit set? */ |
| 915 | static int |
| 916 | arm_hwbp_control_is_enabled (arm_hwbp_control_t control) |
| 917 | { |
| 918 | return control & 0x1; |
| 919 | } |
| 920 | |
| 921 | /* Change a breakpoint control word so that it is in the disabled state. */ |
| 922 | static arm_hwbp_control_t |
| 923 | arm_hwbp_control_disable (arm_hwbp_control_t control) |
| 924 | { |
| 925 | return control & ~0x1; |
| 926 | } |
| 927 | |
| 928 | /* Initialise the hardware breakpoint structure P. The breakpoint will be |
| 929 | enabled, and will point to the placed address of BP_TGT. */ |
| 930 | static void |
| 931 | arm_linux_hw_breakpoint_initialize (struct gdbarch *gdbarch, |
| 932 | struct bp_target_info *bp_tgt, |
| 933 | struct arm_linux_hw_breakpoint *p) |
| 934 | { |
| 935 | unsigned mask; |
| 936 | CORE_ADDR address = bp_tgt->placed_address; |
| 937 | |
| 938 | /* We have to create a mask for the control register which says which bits |
| 939 | of the word pointed to by address to break on. */ |
| 940 | if (arm_pc_is_thumb (gdbarch, address)) |
| 941 | mask = 0x3 << (address & 2); |
| 942 | else |
| 943 | mask = 0xf; |
| 944 | |
| 945 | p->address = (unsigned int) (address & ~3); |
| 946 | p->control = arm_hwbp_control_initialize (mask, arm_hwbp_break, 1); |
| 947 | } |
| 948 | |
| 949 | /* Get the ARM hardware breakpoint type from the RW value we're given when |
| 950 | asked to set a watchpoint. */ |
| 951 | static arm_hwbp_type |
| 952 | arm_linux_get_hwbp_type (int rw) |
| 953 | { |
| 954 | if (rw == hw_read) |
| 955 | return arm_hwbp_load; |
| 956 | else if (rw == hw_write) |
| 957 | return arm_hwbp_store; |
| 958 | else |
| 959 | return arm_hwbp_access; |
| 960 | } |
| 961 | |
| 962 | /* Initialize the hardware breakpoint structure P for a watchpoint at ADDR |
| 963 | to LEN. The type of watchpoint is given in RW. */ |
| 964 | static void |
| 965 | arm_linux_hw_watchpoint_initialize (CORE_ADDR addr, int len, int rw, |
| 966 | struct arm_linux_hw_breakpoint *p) |
| 967 | { |
| 968 | const struct arm_linux_hwbp_cap *cap = arm_linux_get_hwbp_cap (); |
| 969 | unsigned mask; |
| 970 | |
| 971 | gdb_assert (cap != NULL); |
| 972 | gdb_assert (cap->max_wp_length != 0); |
| 973 | |
| 974 | mask = (1 << len) - 1; |
| 975 | |
| 976 | p->address = (unsigned int) addr; |
| 977 | p->control = arm_hwbp_control_initialize (mask, |
| 978 | arm_linux_get_hwbp_type (rw), 1); |
| 979 | } |
| 980 | |
| 981 | /* Are two break-/watch-points equal? */ |
| 982 | static int |
| 983 | arm_linux_hw_breakpoint_equal (const struct arm_linux_hw_breakpoint *p1, |
| 984 | const struct arm_linux_hw_breakpoint *p2) |
| 985 | { |
| 986 | return p1->address == p2->address && p1->control == p2->control; |
| 987 | } |
| 988 | |
| 989 | /* Insert the hardware breakpoint (WATCHPOINT = 0) or watchpoint (WATCHPOINT |
| 990 | =1) BPT for thread TID. */ |
| 991 | static void |
| 992 | arm_linux_insert_hw_breakpoint1 (const struct arm_linux_hw_breakpoint* bpt, |
| 993 | int tid, int watchpoint) |
| 994 | { |
| 995 | struct arm_linux_thread_points *t = arm_linux_find_breakpoints_by_tid (tid, 1); |
| 996 | gdb_byte count, i; |
| 997 | struct arm_linux_hw_breakpoint* bpts; |
| 998 | int dir; |
| 999 | |
| 1000 | gdb_assert (t != NULL); |
| 1001 | |
| 1002 | if (watchpoint) |
| 1003 | { |
| 1004 | count = arm_linux_get_hw_watchpoint_count (); |
| 1005 | bpts = t->wpts; |
| 1006 | dir = -1; |
| 1007 | } |
| 1008 | else |
| 1009 | { |
| 1010 | count = arm_linux_get_hw_breakpoint_count (); |
| 1011 | bpts = t->bpts; |
| 1012 | dir = 1; |
| 1013 | } |
| 1014 | |
| 1015 | for (i = 0; i < count; ++i) |
| 1016 | if (!arm_hwbp_control_is_enabled (bpts[i].control)) |
| 1017 | { |
| 1018 | errno = 0; |
| 1019 | if (ptrace (PTRACE_SETHBPREGS, tid, dir * ((i << 1) + 1), |
| 1020 | &bpt->address) < 0) |
| 1021 | perror_with_name (_("Unexpected error setting breakpoint address")); |
| 1022 | if (ptrace (PTRACE_SETHBPREGS, tid, dir * ((i << 1) + 2), |
| 1023 | &bpt->control) < 0) |
| 1024 | perror_with_name (_("Unexpected error setting breakpoint")); |
| 1025 | |
| 1026 | memcpy (bpts + i, bpt, sizeof (struct arm_linux_hw_breakpoint)); |
| 1027 | break; |
| 1028 | } |
| 1029 | |
| 1030 | gdb_assert (i != count); |
| 1031 | } |
| 1032 | |
| 1033 | /* Remove the hardware breakpoint (WATCHPOINT = 0) or watchpoint |
| 1034 | (WATCHPOINT = 1) BPT for thread TID. */ |
| 1035 | static void |
| 1036 | arm_linux_remove_hw_breakpoint1 (const struct arm_linux_hw_breakpoint *bpt, |
| 1037 | int tid, int watchpoint) |
| 1038 | { |
| 1039 | struct arm_linux_thread_points *t = arm_linux_find_breakpoints_by_tid (tid, 0); |
| 1040 | gdb_byte count, i; |
| 1041 | struct arm_linux_hw_breakpoint *bpts; |
| 1042 | int dir; |
| 1043 | |
| 1044 | gdb_assert (t != NULL); |
| 1045 | |
| 1046 | if (watchpoint) |
| 1047 | { |
| 1048 | count = arm_linux_get_hw_watchpoint_count (); |
| 1049 | bpts = t->wpts; |
| 1050 | dir = -1; |
| 1051 | } |
| 1052 | else |
| 1053 | { |
| 1054 | count = arm_linux_get_hw_breakpoint_count (); |
| 1055 | bpts = t->bpts; |
| 1056 | dir = 1; |
| 1057 | } |
| 1058 | |
| 1059 | for (i = 0; i < count; ++i) |
| 1060 | if (arm_linux_hw_breakpoint_equal (bpt, bpts + i)) |
| 1061 | { |
| 1062 | errno = 0; |
| 1063 | bpts[i].control = arm_hwbp_control_disable (bpts[i].control); |
| 1064 | if (ptrace (PTRACE_SETHBPREGS, tid, dir * ((i << 1) + 2), |
| 1065 | &bpts[i].control) < 0) |
| 1066 | perror_with_name (_("Unexpected error clearing breakpoint")); |
| 1067 | break; |
| 1068 | } |
| 1069 | |
| 1070 | gdb_assert (i != count); |
| 1071 | } |
| 1072 | |
| 1073 | /* Insert a Hardware breakpoint. */ |
| 1074 | static int |
| 1075 | arm_linux_insert_hw_breakpoint (struct gdbarch *gdbarch, |
| 1076 | struct bp_target_info *bp_tgt) |
| 1077 | { |
| 1078 | ptid_t ptid; |
| 1079 | struct lwp_info *lp; |
| 1080 | struct arm_linux_hw_breakpoint p; |
| 1081 | |
| 1082 | if (arm_linux_get_hw_breakpoint_count () == 0) |
| 1083 | return -1; |
| 1084 | |
| 1085 | arm_linux_hw_breakpoint_initialize (gdbarch, bp_tgt, &p); |
| 1086 | ALL_LWPS (lp, ptid) |
| 1087 | arm_linux_insert_hw_breakpoint1 (&p, TIDGET (ptid), 0); |
| 1088 | |
| 1089 | return 0; |
| 1090 | } |
| 1091 | |
| 1092 | /* Remove a hardware breakpoint. */ |
| 1093 | static int |
| 1094 | arm_linux_remove_hw_breakpoint (struct gdbarch *gdbarch, |
| 1095 | struct bp_target_info *bp_tgt) |
| 1096 | { |
| 1097 | ptid_t ptid; |
| 1098 | struct lwp_info *lp; |
| 1099 | struct arm_linux_hw_breakpoint p; |
| 1100 | |
| 1101 | if (arm_linux_get_hw_breakpoint_count () == 0) |
| 1102 | return -1; |
| 1103 | |
| 1104 | arm_linux_hw_breakpoint_initialize (gdbarch, bp_tgt, &p); |
| 1105 | ALL_LWPS (lp, ptid) |
| 1106 | arm_linux_remove_hw_breakpoint1 (&p, TIDGET (ptid), 0); |
| 1107 | |
| 1108 | return 0; |
| 1109 | } |
| 1110 | |
| 1111 | /* Are we able to use a hardware watchpoint for the LEN bytes starting at |
| 1112 | ADDR? */ |
| 1113 | static int |
| 1114 | arm_linux_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) |
| 1115 | { |
| 1116 | const struct arm_linux_hwbp_cap *cap = arm_linux_get_hwbp_cap (); |
| 1117 | CORE_ADDR max_wp_length, aligned_addr; |
| 1118 | |
| 1119 | /* Can not set watchpoints for zero or negative lengths. */ |
| 1120 | if (len <= 0) |
| 1121 | return 0; |
| 1122 | |
| 1123 | /* Need to be able to use the ptrace interface. */ |
| 1124 | if (cap == NULL || cap->wp_count == 0) |
| 1125 | return 0; |
| 1126 | |
| 1127 | /* Test that the range [ADDR, ADDR + LEN) fits into the largest address |
| 1128 | range covered by a watchpoint. */ |
| 1129 | max_wp_length = (CORE_ADDR)cap->max_wp_length; |
| 1130 | aligned_addr = addr & ~(max_wp_length - 1); |
| 1131 | |
| 1132 | if (aligned_addr + max_wp_length < addr + len) |
| 1133 | return 0; |
| 1134 | |
| 1135 | /* The current ptrace interface can only handle watchpoints that are a |
| 1136 | power of 2. */ |
| 1137 | if ((len & (len - 1)) != 0) |
| 1138 | return 0; |
| 1139 | |
| 1140 | /* All tests passed so we must be able to set a watchpoint. */ |
| 1141 | return 1; |
| 1142 | } |
| 1143 | |
| 1144 | /* Insert a Hardware breakpoint. */ |
| 1145 | static int |
| 1146 | arm_linux_insert_watchpoint (CORE_ADDR addr, int len, int rw, |
| 1147 | struct expression *cond) |
| 1148 | { |
| 1149 | ptid_t ptid; |
| 1150 | struct lwp_info *lp; |
| 1151 | struct arm_linux_hw_breakpoint p; |
| 1152 | |
| 1153 | if (arm_linux_get_hw_watchpoint_count () == 0) |
| 1154 | return -1; |
| 1155 | |
| 1156 | arm_linux_hw_watchpoint_initialize (addr, len, rw, &p); |
| 1157 | ALL_LWPS (lp, ptid) |
| 1158 | arm_linux_insert_hw_breakpoint1 (&p, TIDGET (ptid), 1); |
| 1159 | |
| 1160 | return 0; |
| 1161 | } |
| 1162 | |
| 1163 | /* Remove a hardware breakpoint. */ |
| 1164 | static int |
| 1165 | arm_linux_remove_watchpoint (CORE_ADDR addr, int len, int rw, |
| 1166 | struct expression *cond) |
| 1167 | { |
| 1168 | ptid_t ptid; |
| 1169 | struct lwp_info *lp; |
| 1170 | struct arm_linux_hw_breakpoint p; |
| 1171 | |
| 1172 | if (arm_linux_get_hw_watchpoint_count () == 0) |
| 1173 | return -1; |
| 1174 | |
| 1175 | arm_linux_hw_watchpoint_initialize (addr, len, rw, &p); |
| 1176 | ALL_LWPS (lp, ptid) |
| 1177 | arm_linux_remove_hw_breakpoint1 (&p, TIDGET (ptid), 1); |
| 1178 | |
| 1179 | return 0; |
| 1180 | } |
| 1181 | |
| 1182 | /* What was the data address the target was stopped on accessing. */ |
| 1183 | static int |
| 1184 | arm_linux_stopped_data_address (struct target_ops *target, CORE_ADDR *addr_p) |
| 1185 | { |
| 1186 | struct siginfo *siginfo_p = linux_nat_get_siginfo (inferior_ptid); |
| 1187 | int slot = siginfo_p->si_errno; |
| 1188 | |
| 1189 | /* This must be a hardware breakpoint. */ |
| 1190 | if (siginfo_p->si_signo != SIGTRAP |
| 1191 | || (siginfo_p->si_code & 0xffff) != 0x0004 /* TRAP_HWBKPT */) |
| 1192 | return 0; |
| 1193 | |
| 1194 | /* We must be able to set hardware watchpoints. */ |
| 1195 | if (arm_linux_get_hw_watchpoint_count () == 0) |
| 1196 | return 0; |
| 1197 | |
| 1198 | /* If we are in a positive slot then we're looking at a breakpoint and not |
| 1199 | a watchpoint. */ |
| 1200 | if (slot >= 0) |
| 1201 | return 0; |
| 1202 | |
| 1203 | *addr_p = (CORE_ADDR) (uintptr_t) siginfo_p->si_addr; |
| 1204 | return 1; |
| 1205 | } |
| 1206 | |
| 1207 | /* Has the target been stopped by hitting a watchpoint? */ |
| 1208 | static int |
| 1209 | arm_linux_stopped_by_watchpoint (void) |
| 1210 | { |
| 1211 | CORE_ADDR addr; |
| 1212 | return arm_linux_stopped_data_address (¤t_target, &addr); |
| 1213 | } |
| 1214 | |
| 1215 | static int |
| 1216 | arm_linux_watchpoint_addr_within_range (struct target_ops *target, |
| 1217 | CORE_ADDR addr, |
| 1218 | CORE_ADDR start, int length) |
| 1219 | { |
| 1220 | return start <= addr && start + length - 1 >= addr; |
| 1221 | } |
| 1222 | |
| 1223 | /* Handle thread creation. We need to copy the breakpoints and watchpoints |
| 1224 | in the parent thread to the child thread. */ |
| 1225 | static void |
| 1226 | arm_linux_new_thread (ptid_t ptid) |
| 1227 | { |
| 1228 | int tid = TIDGET (ptid); |
| 1229 | const struct arm_linux_hwbp_cap *info = arm_linux_get_hwbp_cap (); |
| 1230 | |
| 1231 | if (info != NULL) |
| 1232 | { |
| 1233 | int i; |
| 1234 | struct arm_linux_thread_points *p; |
| 1235 | struct arm_linux_hw_breakpoint *bpts; |
| 1236 | |
| 1237 | if (VEC_empty (arm_linux_thread_points_p, arm_threads)) |
| 1238 | return; |
| 1239 | |
| 1240 | /* Get a list of breakpoints from any thread. */ |
| 1241 | p = VEC_last (arm_linux_thread_points_p, arm_threads); |
| 1242 | |
| 1243 | /* Copy that thread's breakpoints and watchpoints to the new thread. */ |
| 1244 | for (i = 0; i < info->bp_count; i++) |
| 1245 | if (arm_hwbp_control_is_enabled (p->bpts[i].control)) |
| 1246 | arm_linux_insert_hw_breakpoint1 (p->bpts + i, tid, 0); |
| 1247 | for (i = 0; i < info->wp_count; i++) |
| 1248 | if (arm_hwbp_control_is_enabled (p->wpts[i].control)) |
| 1249 | arm_linux_insert_hw_breakpoint1 (p->wpts + i, tid, 1); |
| 1250 | } |
| 1251 | } |
| 1252 | |
| 1253 | /* Handle thread exit. Tidy up the memory that has been allocated for the |
| 1254 | thread. */ |
| 1255 | static void |
| 1256 | arm_linux_thread_exit (struct thread_info *tp, int silent) |
| 1257 | { |
| 1258 | const struct arm_linux_hwbp_cap *info = arm_linux_get_hwbp_cap (); |
| 1259 | |
| 1260 | if (info != NULL) |
| 1261 | { |
| 1262 | int i; |
| 1263 | int tid = TIDGET (tp->ptid); |
| 1264 | struct arm_linux_thread_points *t = NULL, *p; |
| 1265 | |
| 1266 | for (i = 0; |
| 1267 | VEC_iterate (arm_linux_thread_points_p, arm_threads, i, p); i++) |
| 1268 | { |
| 1269 | if (p->tid == tid) |
| 1270 | { |
| 1271 | t = p; |
| 1272 | break; |
| 1273 | } |
| 1274 | } |
| 1275 | |
| 1276 | if (t == NULL) |
| 1277 | return; |
| 1278 | |
| 1279 | VEC_unordered_remove (arm_linux_thread_points_p, arm_threads, i); |
| 1280 | |
| 1281 | xfree (t->bpts); |
| 1282 | xfree (t->wpts); |
| 1283 | xfree (t); |
| 1284 | } |
| 1285 | } |
| 1286 | |
| 1287 | void _initialize_arm_linux_nat (void); |
| 1288 | |
| 1289 | void |
| 1290 | _initialize_arm_linux_nat (void) |
| 1291 | { |
| 1292 | struct target_ops *t; |
| 1293 | |
| 1294 | os_version = get_linux_version (&os_major, &os_minor, &os_release); |
| 1295 | |
| 1296 | /* Fill in the generic GNU/Linux methods. */ |
| 1297 | t = linux_target (); |
| 1298 | |
| 1299 | /* Add our register access methods. */ |
| 1300 | t->to_fetch_registers = arm_linux_fetch_inferior_registers; |
| 1301 | t->to_store_registers = arm_linux_store_inferior_registers; |
| 1302 | |
| 1303 | /* Add our hardware breakpoint and watchpoint implementation. */ |
| 1304 | t->to_can_use_hw_breakpoint = arm_linux_can_use_hw_breakpoint; |
| 1305 | t->to_insert_hw_breakpoint = arm_linux_insert_hw_breakpoint; |
| 1306 | t->to_remove_hw_breakpoint = arm_linux_remove_hw_breakpoint; |
| 1307 | t->to_region_ok_for_hw_watchpoint = arm_linux_region_ok_for_hw_watchpoint; |
| 1308 | t->to_insert_watchpoint = arm_linux_insert_watchpoint; |
| 1309 | t->to_remove_watchpoint = arm_linux_remove_watchpoint; |
| 1310 | t->to_stopped_by_watchpoint = arm_linux_stopped_by_watchpoint; |
| 1311 | t->to_stopped_data_address = arm_linux_stopped_data_address; |
| 1312 | t->to_watchpoint_addr_within_range = arm_linux_watchpoint_addr_within_range; |
| 1313 | |
| 1314 | t->to_read_description = arm_linux_read_description; |
| 1315 | |
| 1316 | /* Register the target. */ |
| 1317 | linux_nat_add_target (t); |
| 1318 | |
| 1319 | /* Handle thread creation and exit */ |
| 1320 | observer_attach_thread_exit (arm_linux_thread_exit); |
| 1321 | linux_nat_set_new_thread (t, arm_linux_new_thread); |
| 1322 | } |