| 1 | /* GNU/Linux on ARM native support. |
| 2 | Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009, |
| 3 | 2010 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 | |
| 30 | #include "arm-tdep.h" |
| 31 | #include "arm-linux-tdep.h" |
| 32 | |
| 33 | #include <elf/common.h> |
| 34 | #include <sys/user.h> |
| 35 | #include <sys/ptrace.h> |
| 36 | #include <sys/utsname.h> |
| 37 | #include <sys/procfs.h> |
| 38 | |
| 39 | /* Prototypes for supply_gregset etc. */ |
| 40 | #include "gregset.h" |
| 41 | |
| 42 | /* Defines ps_err_e, struct ps_prochandle. */ |
| 43 | #include "gdb_proc_service.h" |
| 44 | |
| 45 | #include "features/arm-with-iwmmxt.c" |
| 46 | #include "features/arm-with-vfpv2.c" |
| 47 | #include "features/arm-with-vfpv3.c" |
| 48 | #include "features/arm-with-neon.c" |
| 49 | |
| 50 | #ifndef PTRACE_GET_THREAD_AREA |
| 51 | #define PTRACE_GET_THREAD_AREA 22 |
| 52 | #endif |
| 53 | |
| 54 | #ifndef PTRACE_GETWMMXREGS |
| 55 | #define PTRACE_GETWMMXREGS 18 |
| 56 | #define PTRACE_SETWMMXREGS 19 |
| 57 | #endif |
| 58 | |
| 59 | #ifndef PTRACE_GETVFPREGS |
| 60 | #define PTRACE_GETVFPREGS 27 |
| 61 | #define PTRACE_SETVFPREGS 28 |
| 62 | #endif |
| 63 | |
| 64 | /* These are in <asm/elf.h> in current kernels. */ |
| 65 | #define HWCAP_VFP 64 |
| 66 | #define HWCAP_IWMMXT 512 |
| 67 | #define HWCAP_NEON 4096 |
| 68 | #define HWCAP_VFPv3 8192 |
| 69 | #define HWCAP_VFPv3D16 16384 |
| 70 | |
| 71 | /* A flag for whether the WMMX registers are available. */ |
| 72 | static int arm_linux_has_wmmx_registers; |
| 73 | |
| 74 | /* The number of 64-bit VFP registers we have (expect this to be 0, |
| 75 | 16, or 32). */ |
| 76 | static int arm_linux_vfp_register_count; |
| 77 | |
| 78 | extern int arm_apcs_32; |
| 79 | |
| 80 | /* The following variables are used to determine the version of the |
| 81 | underlying GNU/Linux operating system. Examples: |
| 82 | |
| 83 | GNU/Linux 2.0.35 GNU/Linux 2.2.12 |
| 84 | os_version = 0x00020023 os_version = 0x0002020c |
| 85 | os_major = 2 os_major = 2 |
| 86 | os_minor = 0 os_minor = 2 |
| 87 | os_release = 35 os_release = 12 |
| 88 | |
| 89 | Note: os_version = (os_major << 16) | (os_minor << 8) | os_release |
| 90 | |
| 91 | These are initialized using get_linux_version() from |
| 92 | _initialize_arm_linux_nat(). */ |
| 93 | |
| 94 | static unsigned int os_version, os_major, os_minor, os_release; |
| 95 | |
| 96 | /* On GNU/Linux, threads are implemented as pseudo-processes, in which |
| 97 | case we may be tracing more than one process at a time. In that |
| 98 | case, inferior_ptid will contain the main process ID and the |
| 99 | individual thread (process) ID. get_thread_id () is used to get |
| 100 | the thread id if it's available, and the process id otherwise. */ |
| 101 | |
| 102 | int |
| 103 | get_thread_id (ptid_t ptid) |
| 104 | { |
| 105 | int tid = TIDGET (ptid); |
| 106 | if (0 == tid) |
| 107 | tid = PIDGET (ptid); |
| 108 | return tid; |
| 109 | } |
| 110 | |
| 111 | #define GET_THREAD_ID(PTID) get_thread_id (PTID) |
| 112 | |
| 113 | /* Get the value of a particular register from the floating point |
| 114 | state of the process and store it into regcache. */ |
| 115 | |
| 116 | static void |
| 117 | fetch_fpregister (struct regcache *regcache, int regno) |
| 118 | { |
| 119 | int ret, tid; |
| 120 | gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| 121 | |
| 122 | /* Get the thread id for the ptrace call. */ |
| 123 | tid = GET_THREAD_ID (inferior_ptid); |
| 124 | |
| 125 | /* Read the floating point state. */ |
| 126 | ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| 127 | if (ret < 0) |
| 128 | { |
| 129 | warning (_("Unable to fetch floating point register.")); |
| 130 | return; |
| 131 | } |
| 132 | |
| 133 | /* Fetch fpsr. */ |
| 134 | if (ARM_FPS_REGNUM == regno) |
| 135 | regcache_raw_supply (regcache, ARM_FPS_REGNUM, |
| 136 | fp + NWFPE_FPSR_OFFSET); |
| 137 | |
| 138 | /* Fetch the floating point register. */ |
| 139 | if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM) |
| 140 | supply_nwfpe_register (regcache, regno, fp); |
| 141 | } |
| 142 | |
| 143 | /* Get the whole floating point state of the process and store it |
| 144 | into regcache. */ |
| 145 | |
| 146 | static void |
| 147 | fetch_fpregs (struct regcache *regcache) |
| 148 | { |
| 149 | int ret, regno, tid; |
| 150 | gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| 151 | |
| 152 | /* Get the thread id for the ptrace call. */ |
| 153 | tid = GET_THREAD_ID (inferior_ptid); |
| 154 | |
| 155 | /* Read the floating point state. */ |
| 156 | ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| 157 | if (ret < 0) |
| 158 | { |
| 159 | warning (_("Unable to fetch the floating point registers.")); |
| 160 | return; |
| 161 | } |
| 162 | |
| 163 | /* Fetch fpsr. */ |
| 164 | regcache_raw_supply (regcache, ARM_FPS_REGNUM, |
| 165 | fp + NWFPE_FPSR_OFFSET); |
| 166 | |
| 167 | /* Fetch the floating point registers. */ |
| 168 | for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++) |
| 169 | supply_nwfpe_register (regcache, regno, fp); |
| 170 | } |
| 171 | |
| 172 | /* Save a particular register into the floating point state of the |
| 173 | process using the contents from regcache. */ |
| 174 | |
| 175 | static void |
| 176 | store_fpregister (const struct regcache *regcache, int regno) |
| 177 | { |
| 178 | int ret, tid; |
| 179 | gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| 180 | |
| 181 | /* Get the thread id for the ptrace call. */ |
| 182 | tid = GET_THREAD_ID (inferior_ptid); |
| 183 | |
| 184 | /* Read the floating point state. */ |
| 185 | ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| 186 | if (ret < 0) |
| 187 | { |
| 188 | warning (_("Unable to fetch the floating point registers.")); |
| 189 | return; |
| 190 | } |
| 191 | |
| 192 | /* Store fpsr. */ |
| 193 | if (ARM_FPS_REGNUM == regno && regcache_valid_p (regcache, ARM_FPS_REGNUM)) |
| 194 | regcache_raw_collect (regcache, ARM_FPS_REGNUM, fp + NWFPE_FPSR_OFFSET); |
| 195 | |
| 196 | /* Store the floating point register. */ |
| 197 | if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM) |
| 198 | collect_nwfpe_register (regcache, regno, fp); |
| 199 | |
| 200 | ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp); |
| 201 | if (ret < 0) |
| 202 | { |
| 203 | warning (_("Unable to store floating point register.")); |
| 204 | return; |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | /* Save the whole floating point state of the process using |
| 209 | the contents from regcache. */ |
| 210 | |
| 211 | static void |
| 212 | store_fpregs (const struct regcache *regcache) |
| 213 | { |
| 214 | int ret, regno, tid; |
| 215 | gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| 216 | |
| 217 | /* Get the thread id for the ptrace call. */ |
| 218 | tid = GET_THREAD_ID (inferior_ptid); |
| 219 | |
| 220 | /* Read the floating point state. */ |
| 221 | ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| 222 | if (ret < 0) |
| 223 | { |
| 224 | warning (_("Unable to fetch the floating point registers.")); |
| 225 | return; |
| 226 | } |
| 227 | |
| 228 | /* Store fpsr. */ |
| 229 | if (regcache_valid_p (regcache, ARM_FPS_REGNUM)) |
| 230 | regcache_raw_collect (regcache, ARM_FPS_REGNUM, fp + NWFPE_FPSR_OFFSET); |
| 231 | |
| 232 | /* Store the floating point registers. */ |
| 233 | for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++) |
| 234 | if (regcache_valid_p (regcache, regno)) |
| 235 | collect_nwfpe_register (regcache, regno, fp); |
| 236 | |
| 237 | ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp); |
| 238 | if (ret < 0) |
| 239 | { |
| 240 | warning (_("Unable to store floating point registers.")); |
| 241 | return; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | /* Fetch a general register of the process and store into |
| 246 | regcache. */ |
| 247 | |
| 248 | static void |
| 249 | fetch_register (struct regcache *regcache, int regno) |
| 250 | { |
| 251 | int ret, tid; |
| 252 | elf_gregset_t regs; |
| 253 | |
| 254 | /* Get the thread id for the ptrace call. */ |
| 255 | tid = GET_THREAD_ID (inferior_ptid); |
| 256 | |
| 257 | ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| 258 | if (ret < 0) |
| 259 | { |
| 260 | warning (_("Unable to fetch general register.")); |
| 261 | return; |
| 262 | } |
| 263 | |
| 264 | if (regno >= ARM_A1_REGNUM && regno < ARM_PC_REGNUM) |
| 265 | regcache_raw_supply (regcache, regno, (char *) ®s[regno]); |
| 266 | |
| 267 | if (ARM_PS_REGNUM == regno) |
| 268 | { |
| 269 | if (arm_apcs_32) |
| 270 | regcache_raw_supply (regcache, ARM_PS_REGNUM, |
| 271 | (char *) ®s[ARM_CPSR_GREGNUM]); |
| 272 | else |
| 273 | regcache_raw_supply (regcache, ARM_PS_REGNUM, |
| 274 | (char *) ®s[ARM_PC_REGNUM]); |
| 275 | } |
| 276 | |
| 277 | if (ARM_PC_REGNUM == regno) |
| 278 | { |
| 279 | regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove |
| 280 | (get_regcache_arch (regcache), |
| 281 | regs[ARM_PC_REGNUM]); |
| 282 | regcache_raw_supply (regcache, ARM_PC_REGNUM, |
| 283 | (char *) ®s[ARM_PC_REGNUM]); |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | /* Fetch all general registers of the process and store into |
| 288 | regcache. */ |
| 289 | |
| 290 | static void |
| 291 | fetch_regs (struct regcache *regcache) |
| 292 | { |
| 293 | int ret, regno, tid; |
| 294 | elf_gregset_t regs; |
| 295 | |
| 296 | /* Get the thread id for the ptrace call. */ |
| 297 | tid = GET_THREAD_ID (inferior_ptid); |
| 298 | |
| 299 | ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| 300 | if (ret < 0) |
| 301 | { |
| 302 | warning (_("Unable to fetch general registers.")); |
| 303 | return; |
| 304 | } |
| 305 | |
| 306 | for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++) |
| 307 | regcache_raw_supply (regcache, regno, (char *) ®s[regno]); |
| 308 | |
| 309 | if (arm_apcs_32) |
| 310 | regcache_raw_supply (regcache, ARM_PS_REGNUM, |
| 311 | (char *) ®s[ARM_CPSR_GREGNUM]); |
| 312 | else |
| 313 | regcache_raw_supply (regcache, ARM_PS_REGNUM, |
| 314 | (char *) ®s[ARM_PC_REGNUM]); |
| 315 | |
| 316 | regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove |
| 317 | (get_regcache_arch (regcache), regs[ARM_PC_REGNUM]); |
| 318 | regcache_raw_supply (regcache, ARM_PC_REGNUM, |
| 319 | (char *) ®s[ARM_PC_REGNUM]); |
| 320 | } |
| 321 | |
| 322 | /* Store all general registers of the process from the values in |
| 323 | regcache. */ |
| 324 | |
| 325 | static void |
| 326 | store_register (const struct regcache *regcache, int regno) |
| 327 | { |
| 328 | int ret, tid; |
| 329 | elf_gregset_t regs; |
| 330 | |
| 331 | if (!regcache_valid_p (regcache, regno)) |
| 332 | return; |
| 333 | |
| 334 | /* Get the thread id for the ptrace call. */ |
| 335 | tid = GET_THREAD_ID (inferior_ptid); |
| 336 | |
| 337 | /* Get the general registers from the process. */ |
| 338 | ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| 339 | if (ret < 0) |
| 340 | { |
| 341 | warning (_("Unable to fetch general registers.")); |
| 342 | return; |
| 343 | } |
| 344 | |
| 345 | if (regno >= ARM_A1_REGNUM && regno <= ARM_PC_REGNUM) |
| 346 | regcache_raw_collect (regcache, regno, (char *) ®s[regno]); |
| 347 | else if (arm_apcs_32 && regno == ARM_PS_REGNUM) |
| 348 | regcache_raw_collect (regcache, regno, |
| 349 | (char *) ®s[ARM_CPSR_GREGNUM]); |
| 350 | else if (!arm_apcs_32 && regno == ARM_PS_REGNUM) |
| 351 | regcache_raw_collect (regcache, ARM_PC_REGNUM, |
| 352 | (char *) ®s[ARM_PC_REGNUM]); |
| 353 | |
| 354 | ret = ptrace (PTRACE_SETREGS, tid, 0, ®s); |
| 355 | if (ret < 0) |
| 356 | { |
| 357 | warning (_("Unable to store general register.")); |
| 358 | return; |
| 359 | } |
| 360 | } |
| 361 | |
| 362 | static void |
| 363 | store_regs (const struct regcache *regcache) |
| 364 | { |
| 365 | int ret, regno, tid; |
| 366 | elf_gregset_t regs; |
| 367 | |
| 368 | /* Get the thread id for the ptrace call. */ |
| 369 | tid = GET_THREAD_ID (inferior_ptid); |
| 370 | |
| 371 | /* Fetch the general registers. */ |
| 372 | ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| 373 | if (ret < 0) |
| 374 | { |
| 375 | warning (_("Unable to fetch general registers.")); |
| 376 | return; |
| 377 | } |
| 378 | |
| 379 | for (regno = ARM_A1_REGNUM; regno <= ARM_PC_REGNUM; regno++) |
| 380 | { |
| 381 | if (regcache_valid_p (regcache, regno)) |
| 382 | regcache_raw_collect (regcache, regno, (char *) ®s[regno]); |
| 383 | } |
| 384 | |
| 385 | if (arm_apcs_32 && regcache_valid_p (regcache, ARM_PS_REGNUM)) |
| 386 | regcache_raw_collect (regcache, ARM_PS_REGNUM, |
| 387 | (char *) ®s[ARM_CPSR_GREGNUM]); |
| 388 | |
| 389 | ret = ptrace (PTRACE_SETREGS, tid, 0, ®s); |
| 390 | |
| 391 | if (ret < 0) |
| 392 | { |
| 393 | warning (_("Unable to store general registers.")); |
| 394 | return; |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | /* Fetch all WMMX registers of the process and store into |
| 399 | regcache. */ |
| 400 | |
| 401 | #define IWMMXT_REGS_SIZE (16 * 8 + 6 * 4) |
| 402 | |
| 403 | static void |
| 404 | fetch_wmmx_regs (struct regcache *regcache) |
| 405 | { |
| 406 | char regbuf[IWMMXT_REGS_SIZE]; |
| 407 | int ret, regno, tid; |
| 408 | |
| 409 | /* Get the thread id for the ptrace call. */ |
| 410 | tid = GET_THREAD_ID (inferior_ptid); |
| 411 | |
| 412 | ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf); |
| 413 | if (ret < 0) |
| 414 | { |
| 415 | warning (_("Unable to fetch WMMX registers.")); |
| 416 | return; |
| 417 | } |
| 418 | |
| 419 | for (regno = 0; regno < 16; regno++) |
| 420 | regcache_raw_supply (regcache, regno + ARM_WR0_REGNUM, |
| 421 | ®buf[regno * 8]); |
| 422 | |
| 423 | for (regno = 0; regno < 2; regno++) |
| 424 | regcache_raw_supply (regcache, regno + ARM_WCSSF_REGNUM, |
| 425 | ®buf[16 * 8 + regno * 4]); |
| 426 | |
| 427 | for (regno = 0; regno < 4; regno++) |
| 428 | regcache_raw_supply (regcache, regno + ARM_WCGR0_REGNUM, |
| 429 | ®buf[16 * 8 + 2 * 4 + regno * 4]); |
| 430 | } |
| 431 | |
| 432 | static void |
| 433 | store_wmmx_regs (const struct regcache *regcache) |
| 434 | { |
| 435 | char regbuf[IWMMXT_REGS_SIZE]; |
| 436 | int ret, regno, tid; |
| 437 | |
| 438 | /* Get the thread id for the ptrace call. */ |
| 439 | tid = GET_THREAD_ID (inferior_ptid); |
| 440 | |
| 441 | ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf); |
| 442 | if (ret < 0) |
| 443 | { |
| 444 | warning (_("Unable to fetch WMMX registers.")); |
| 445 | return; |
| 446 | } |
| 447 | |
| 448 | for (regno = 0; regno < 16; regno++) |
| 449 | if (regcache_valid_p (regcache, regno + ARM_WR0_REGNUM)) |
| 450 | regcache_raw_collect (regcache, regno + ARM_WR0_REGNUM, |
| 451 | ®buf[regno * 8]); |
| 452 | |
| 453 | for (regno = 0; regno < 2; regno++) |
| 454 | if (regcache_valid_p (regcache, regno + ARM_WCSSF_REGNUM)) |
| 455 | regcache_raw_collect (regcache, regno + ARM_WCSSF_REGNUM, |
| 456 | ®buf[16 * 8 + regno * 4]); |
| 457 | |
| 458 | for (regno = 0; regno < 4; regno++) |
| 459 | if (regcache_valid_p (regcache, regno + ARM_WCGR0_REGNUM)) |
| 460 | regcache_raw_collect (regcache, regno + ARM_WCGR0_REGNUM, |
| 461 | ®buf[16 * 8 + 2 * 4 + regno * 4]); |
| 462 | |
| 463 | ret = ptrace (PTRACE_SETWMMXREGS, tid, 0, regbuf); |
| 464 | |
| 465 | if (ret < 0) |
| 466 | { |
| 467 | warning (_("Unable to store WMMX registers.")); |
| 468 | return; |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | /* Fetch and store VFP Registers. The kernel object has space for 32 |
| 473 | 64-bit registers, and the FPSCR. This is even when on a VFPv2 or |
| 474 | VFPv3D16 target. */ |
| 475 | #define VFP_REGS_SIZE (32 * 8 + 4) |
| 476 | |
| 477 | static void |
| 478 | fetch_vfp_regs (struct regcache *regcache) |
| 479 | { |
| 480 | char regbuf[VFP_REGS_SIZE]; |
| 481 | int ret, regno, tid; |
| 482 | |
| 483 | /* Get the thread id for the ptrace call. */ |
| 484 | tid = GET_THREAD_ID (inferior_ptid); |
| 485 | |
| 486 | ret = ptrace (PTRACE_GETVFPREGS, tid, 0, regbuf); |
| 487 | if (ret < 0) |
| 488 | { |
| 489 | warning (_("Unable to fetch VFP registers.")); |
| 490 | return; |
| 491 | } |
| 492 | |
| 493 | for (regno = 0; regno < arm_linux_vfp_register_count; regno++) |
| 494 | regcache_raw_supply (regcache, regno + ARM_D0_REGNUM, |
| 495 | (char *) regbuf + regno * 8); |
| 496 | |
| 497 | regcache_raw_supply (regcache, ARM_FPSCR_REGNUM, |
| 498 | (char *) regbuf + 32 * 8); |
| 499 | } |
| 500 | |
| 501 | static void |
| 502 | store_vfp_regs (const struct regcache *regcache) |
| 503 | { |
| 504 | char regbuf[VFP_REGS_SIZE]; |
| 505 | int ret, regno, tid; |
| 506 | |
| 507 | /* Get the thread id for the ptrace call. */ |
| 508 | tid = GET_THREAD_ID (inferior_ptid); |
| 509 | |
| 510 | ret = ptrace (PTRACE_GETVFPREGS, tid, 0, regbuf); |
| 511 | if (ret < 0) |
| 512 | { |
| 513 | warning (_("Unable to fetch VFP registers (for update).")); |
| 514 | return; |
| 515 | } |
| 516 | |
| 517 | for (regno = 0; regno < arm_linux_vfp_register_count; regno++) |
| 518 | regcache_raw_collect (regcache, regno + ARM_D0_REGNUM, |
| 519 | (char *) regbuf + regno * 8); |
| 520 | |
| 521 | regcache_raw_collect (regcache, ARM_FPSCR_REGNUM, |
| 522 | (char *) regbuf + 32 * 8); |
| 523 | |
| 524 | ret = ptrace (PTRACE_SETVFPREGS, tid, 0, regbuf); |
| 525 | |
| 526 | if (ret < 0) |
| 527 | { |
| 528 | warning (_("Unable to store VFP registers.")); |
| 529 | return; |
| 530 | } |
| 531 | } |
| 532 | |
| 533 | /* Fetch registers from the child process. Fetch all registers if |
| 534 | regno == -1, otherwise fetch all general registers or all floating |
| 535 | point registers depending upon the value of regno. */ |
| 536 | |
| 537 | static void |
| 538 | arm_linux_fetch_inferior_registers (struct target_ops *ops, |
| 539 | struct regcache *regcache, int regno) |
| 540 | { |
| 541 | if (-1 == regno) |
| 542 | { |
| 543 | fetch_regs (regcache); |
| 544 | fetch_fpregs (regcache); |
| 545 | if (arm_linux_has_wmmx_registers) |
| 546 | fetch_wmmx_regs (regcache); |
| 547 | if (arm_linux_vfp_register_count > 0) |
| 548 | fetch_vfp_regs (regcache); |
| 549 | } |
| 550 | else |
| 551 | { |
| 552 | if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM) |
| 553 | fetch_register (regcache, regno); |
| 554 | else if (regno >= ARM_F0_REGNUM && regno <= ARM_FPS_REGNUM) |
| 555 | fetch_fpregister (regcache, regno); |
| 556 | else if (arm_linux_has_wmmx_registers |
| 557 | && regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM) |
| 558 | fetch_wmmx_regs (regcache); |
| 559 | else if (arm_linux_vfp_register_count > 0 |
| 560 | && regno >= ARM_D0_REGNUM |
| 561 | && regno <= ARM_D0_REGNUM + arm_linux_vfp_register_count) |
| 562 | fetch_vfp_regs (regcache); |
| 563 | } |
| 564 | } |
| 565 | |
| 566 | /* Store registers back into the inferior. Store all registers if |
| 567 | regno == -1, otherwise store all general registers or all floating |
| 568 | point registers depending upon the value of regno. */ |
| 569 | |
| 570 | static void |
| 571 | arm_linux_store_inferior_registers (struct target_ops *ops, |
| 572 | struct regcache *regcache, int regno) |
| 573 | { |
| 574 | if (-1 == regno) |
| 575 | { |
| 576 | store_regs (regcache); |
| 577 | store_fpregs (regcache); |
| 578 | if (arm_linux_has_wmmx_registers) |
| 579 | store_wmmx_regs (regcache); |
| 580 | if (arm_linux_vfp_register_count > 0) |
| 581 | store_vfp_regs (regcache); |
| 582 | } |
| 583 | else |
| 584 | { |
| 585 | if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM) |
| 586 | store_register (regcache, regno); |
| 587 | else if ((regno >= ARM_F0_REGNUM) && (regno <= ARM_FPS_REGNUM)) |
| 588 | store_fpregister (regcache, regno); |
| 589 | else if (arm_linux_has_wmmx_registers |
| 590 | && regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM) |
| 591 | store_wmmx_regs (regcache); |
| 592 | else if (arm_linux_vfp_register_count > 0 |
| 593 | && regno >= ARM_D0_REGNUM |
| 594 | && regno <= ARM_D0_REGNUM + arm_linux_vfp_register_count) |
| 595 | store_vfp_regs (regcache); |
| 596 | } |
| 597 | } |
| 598 | |
| 599 | /* Wrapper functions for the standard regset handling, used by |
| 600 | thread debugging. */ |
| 601 | |
| 602 | void |
| 603 | fill_gregset (const struct regcache *regcache, |
| 604 | gdb_gregset_t *gregsetp, int regno) |
| 605 | { |
| 606 | arm_linux_collect_gregset (NULL, regcache, regno, gregsetp, 0); |
| 607 | } |
| 608 | |
| 609 | void |
| 610 | supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) |
| 611 | { |
| 612 | arm_linux_supply_gregset (NULL, regcache, -1, gregsetp, 0); |
| 613 | } |
| 614 | |
| 615 | void |
| 616 | fill_fpregset (const struct regcache *regcache, |
| 617 | gdb_fpregset_t *fpregsetp, int regno) |
| 618 | { |
| 619 | arm_linux_collect_nwfpe (NULL, regcache, regno, fpregsetp, 0); |
| 620 | } |
| 621 | |
| 622 | /* Fill GDB's register array with the floating-point register values |
| 623 | in *fpregsetp. */ |
| 624 | |
| 625 | void |
| 626 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp) |
| 627 | { |
| 628 | arm_linux_supply_nwfpe (NULL, regcache, -1, fpregsetp, 0); |
| 629 | } |
| 630 | |
| 631 | /* Fetch the thread-local storage pointer for libthread_db. */ |
| 632 | |
| 633 | ps_err_e |
| 634 | ps_get_thread_area (const struct ps_prochandle *ph, |
| 635 | lwpid_t lwpid, int idx, void **base) |
| 636 | { |
| 637 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) |
| 638 | return PS_ERR; |
| 639 | |
| 640 | /* IDX is the bias from the thread pointer to the beginning of the |
| 641 | thread descriptor. It has to be subtracted due to implementation |
| 642 | quirks in libthread_db. */ |
| 643 | *base = (void *) ((char *)*base - idx); |
| 644 | |
| 645 | return PS_OK; |
| 646 | } |
| 647 | |
| 648 | static unsigned int |
| 649 | get_linux_version (unsigned int *vmajor, |
| 650 | unsigned int *vminor, |
| 651 | unsigned int *vrelease) |
| 652 | { |
| 653 | struct utsname info; |
| 654 | char *pmajor, *pminor, *prelease, *tail; |
| 655 | |
| 656 | if (-1 == uname (&info)) |
| 657 | { |
| 658 | warning (_("Unable to determine GNU/Linux version.")); |
| 659 | return -1; |
| 660 | } |
| 661 | |
| 662 | pmajor = strtok (info.release, "."); |
| 663 | pminor = strtok (NULL, "."); |
| 664 | prelease = strtok (NULL, "."); |
| 665 | |
| 666 | *vmajor = (unsigned int) strtoul (pmajor, &tail, 0); |
| 667 | *vminor = (unsigned int) strtoul (pminor, &tail, 0); |
| 668 | *vrelease = (unsigned int) strtoul (prelease, &tail, 0); |
| 669 | |
| 670 | return ((*vmajor << 16) | (*vminor << 8) | *vrelease); |
| 671 | } |
| 672 | |
| 673 | static const struct target_desc * |
| 674 | arm_linux_read_description (struct target_ops *ops) |
| 675 | { |
| 676 | CORE_ADDR arm_hwcap = 0; |
| 677 | arm_linux_has_wmmx_registers = 0; |
| 678 | arm_linux_vfp_register_count = 0; |
| 679 | |
| 680 | if (target_auxv_search (ops, AT_HWCAP, &arm_hwcap) != 1) |
| 681 | { |
| 682 | return NULL; |
| 683 | } |
| 684 | |
| 685 | if (arm_hwcap & HWCAP_IWMMXT) |
| 686 | { |
| 687 | arm_linux_has_wmmx_registers = 1; |
| 688 | if (tdesc_arm_with_iwmmxt == NULL) |
| 689 | initialize_tdesc_arm_with_iwmmxt (); |
| 690 | return tdesc_arm_with_iwmmxt; |
| 691 | } |
| 692 | |
| 693 | if (arm_hwcap & HWCAP_VFP) |
| 694 | { |
| 695 | int pid; |
| 696 | char *buf; |
| 697 | const struct target_desc * result = NULL; |
| 698 | |
| 699 | /* NEON implies VFPv3-D32 or no-VFP unit. Say that we only support |
| 700 | Neon with VFPv3-D32. */ |
| 701 | if (arm_hwcap & HWCAP_NEON) |
| 702 | { |
| 703 | arm_linux_vfp_register_count = 32; |
| 704 | if (tdesc_arm_with_neon == NULL) |
| 705 | initialize_tdesc_arm_with_neon (); |
| 706 | result = tdesc_arm_with_neon; |
| 707 | } |
| 708 | else if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3) |
| 709 | { |
| 710 | arm_linux_vfp_register_count = 32; |
| 711 | if (tdesc_arm_with_vfpv3 == NULL) |
| 712 | initialize_tdesc_arm_with_vfpv3 (); |
| 713 | result = tdesc_arm_with_vfpv3; |
| 714 | } |
| 715 | else |
| 716 | { |
| 717 | arm_linux_vfp_register_count = 16; |
| 718 | if (tdesc_arm_with_vfpv2 == NULL) |
| 719 | initialize_tdesc_arm_with_vfpv2 (); |
| 720 | result = tdesc_arm_with_vfpv2; |
| 721 | } |
| 722 | |
| 723 | /* Now make sure that the kernel supports reading these |
| 724 | registers. Support was added in 2.6.30. */ |
| 725 | pid = GET_LWP (inferior_ptid); |
| 726 | errno = 0; |
| 727 | buf = alloca (VFP_REGS_SIZE); |
| 728 | if (ptrace (PTRACE_GETVFPREGS, pid, 0, buf) < 0 |
| 729 | && errno == EIO) |
| 730 | result = NULL; |
| 731 | |
| 732 | return result; |
| 733 | } |
| 734 | |
| 735 | return NULL; |
| 736 | } |
| 737 | |
| 738 | void _initialize_arm_linux_nat (void); |
| 739 | |
| 740 | void |
| 741 | _initialize_arm_linux_nat (void) |
| 742 | { |
| 743 | struct target_ops *t; |
| 744 | |
| 745 | os_version = get_linux_version (&os_major, &os_minor, &os_release); |
| 746 | |
| 747 | /* Fill in the generic GNU/Linux methods. */ |
| 748 | t = linux_target (); |
| 749 | |
| 750 | /* Add our register access methods. */ |
| 751 | t->to_fetch_registers = arm_linux_fetch_inferior_registers; |
| 752 | t->to_store_registers = arm_linux_store_inferior_registers; |
| 753 | |
| 754 | t->to_read_description = arm_linux_read_description; |
| 755 | |
| 756 | /* Register the target. */ |
| 757 | linux_nat_add_target (t); |
| 758 | } |