| 1 | /* GNU/Linux on ARM native support. |
| 2 | Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2006, 2007 |
| 3 | 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 2 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, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 20 | Boston, MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "inferior.h" |
| 24 | #include "gdbcore.h" |
| 25 | #include "gdb_string.h" |
| 26 | #include "regcache.h" |
| 27 | #include "target.h" |
| 28 | #include "linux-nat.h" |
| 29 | |
| 30 | #include "arm-tdep.h" |
| 31 | #include "arm-linux-tdep.h" |
| 32 | |
| 33 | #include <sys/user.h> |
| 34 | #include <sys/ptrace.h> |
| 35 | #include <sys/utsname.h> |
| 36 | #include <sys/procfs.h> |
| 37 | |
| 38 | /* Prototypes for supply_gregset etc. */ |
| 39 | #include "gregset.h" |
| 40 | |
| 41 | /* Defines ps_err_e, struct ps_prochandle. */ |
| 42 | #include "gdb_proc_service.h" |
| 43 | |
| 44 | #ifndef PTRACE_GET_THREAD_AREA |
| 45 | #define PTRACE_GET_THREAD_AREA 22 |
| 46 | #endif |
| 47 | |
| 48 | extern int arm_apcs_32; |
| 49 | |
| 50 | /* The following variables are used to determine the version of the |
| 51 | underlying GNU/Linux operating system. Examples: |
| 52 | |
| 53 | GNU/Linux 2.0.35 GNU/Linux 2.2.12 |
| 54 | os_version = 0x00020023 os_version = 0x0002020c |
| 55 | os_major = 2 os_major = 2 |
| 56 | os_minor = 0 os_minor = 2 |
| 57 | os_release = 35 os_release = 12 |
| 58 | |
| 59 | Note: os_version = (os_major << 16) | (os_minor << 8) | os_release |
| 60 | |
| 61 | These are initialized using get_linux_version() from |
| 62 | _initialize_arm_linux_nat(). */ |
| 63 | |
| 64 | static unsigned int os_version, os_major, os_minor, os_release; |
| 65 | |
| 66 | /* On GNU/Linux, threads are implemented as pseudo-processes, in which |
| 67 | case we may be tracing more than one process at a time. In that |
| 68 | case, inferior_ptid will contain the main process ID and the |
| 69 | individual thread (process) ID. get_thread_id () is used to get |
| 70 | the thread id if it's available, and the process id otherwise. */ |
| 71 | |
| 72 | int |
| 73 | get_thread_id (ptid_t ptid) |
| 74 | { |
| 75 | int tid = TIDGET (ptid); |
| 76 | if (0 == tid) |
| 77 | tid = PIDGET (ptid); |
| 78 | return tid; |
| 79 | } |
| 80 | #define GET_THREAD_ID(PTID) get_thread_id ((PTID)); |
| 81 | |
| 82 | /* Get the value of a particular register from the floating point |
| 83 | state of the process and store it into regcache. */ |
| 84 | |
| 85 | static void |
| 86 | fetch_fpregister (int regno) |
| 87 | { |
| 88 | int ret, tid; |
| 89 | gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| 90 | |
| 91 | /* Get the thread id for the ptrace call. */ |
| 92 | tid = GET_THREAD_ID (inferior_ptid); |
| 93 | |
| 94 | /* Read the floating point state. */ |
| 95 | ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| 96 | if (ret < 0) |
| 97 | { |
| 98 | warning (_("Unable to fetch floating point register.")); |
| 99 | return; |
| 100 | } |
| 101 | |
| 102 | /* Fetch fpsr. */ |
| 103 | if (ARM_FPS_REGNUM == regno) |
| 104 | regcache_raw_supply (current_regcache, ARM_FPS_REGNUM, |
| 105 | fp + NWFPE_FPSR_OFFSET); |
| 106 | |
| 107 | /* Fetch the floating point register. */ |
| 108 | if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM) |
| 109 | supply_nwfpe_register (current_regcache, regno, fp); |
| 110 | } |
| 111 | |
| 112 | /* Get the whole floating point state of the process and store it |
| 113 | into regcache. */ |
| 114 | |
| 115 | static void |
| 116 | fetch_fpregs (void) |
| 117 | { |
| 118 | int ret, regno, tid; |
| 119 | gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| 120 | |
| 121 | /* Get the thread id for the ptrace call. */ |
| 122 | tid = GET_THREAD_ID (inferior_ptid); |
| 123 | |
| 124 | /* Read the floating point state. */ |
| 125 | ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| 126 | if (ret < 0) |
| 127 | { |
| 128 | warning (_("Unable to fetch the floating point registers.")); |
| 129 | return; |
| 130 | } |
| 131 | |
| 132 | /* Fetch fpsr. */ |
| 133 | regcache_raw_supply (current_regcache, ARM_FPS_REGNUM, |
| 134 | fp + NWFPE_FPSR_OFFSET); |
| 135 | |
| 136 | /* Fetch the floating point registers. */ |
| 137 | for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++) |
| 138 | supply_nwfpe_register (current_regcache, regno, fp); |
| 139 | } |
| 140 | |
| 141 | /* Save a particular register into the floating point state of the |
| 142 | process using the contents from regcache. */ |
| 143 | |
| 144 | static void |
| 145 | store_fpregister (int regno) |
| 146 | { |
| 147 | int ret, tid; |
| 148 | gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| 149 | |
| 150 | /* Get the thread id for the ptrace call. */ |
| 151 | tid = GET_THREAD_ID (inferior_ptid); |
| 152 | |
| 153 | /* Read the floating point state. */ |
| 154 | ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| 155 | if (ret < 0) |
| 156 | { |
| 157 | warning (_("Unable to fetch the floating point registers.")); |
| 158 | return; |
| 159 | } |
| 160 | |
| 161 | /* Store fpsr. */ |
| 162 | if (ARM_FPS_REGNUM == regno && register_cached (ARM_FPS_REGNUM)) |
| 163 | regcache_raw_collect (current_regcache, ARM_FPS_REGNUM, |
| 164 | fp + NWFPE_FPSR_OFFSET); |
| 165 | |
| 166 | /* Store the floating point register. */ |
| 167 | if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM) |
| 168 | collect_nwfpe_register (current_regcache, regno, fp); |
| 169 | |
| 170 | ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp); |
| 171 | if (ret < 0) |
| 172 | { |
| 173 | warning (_("Unable to store floating point register.")); |
| 174 | return; |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | /* Save the whole floating point state of the process using |
| 179 | the contents from regcache. */ |
| 180 | |
| 181 | static void |
| 182 | store_fpregs (void) |
| 183 | { |
| 184 | int ret, regno, tid; |
| 185 | gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE]; |
| 186 | |
| 187 | /* Get the thread id for the ptrace call. */ |
| 188 | tid = GET_THREAD_ID (inferior_ptid); |
| 189 | |
| 190 | /* Read the floating point state. */ |
| 191 | ret = ptrace (PT_GETFPREGS, tid, 0, fp); |
| 192 | if (ret < 0) |
| 193 | { |
| 194 | warning (_("Unable to fetch the floating point registers.")); |
| 195 | return; |
| 196 | } |
| 197 | |
| 198 | /* Store fpsr. */ |
| 199 | if (register_cached (ARM_FPS_REGNUM)) |
| 200 | regcache_raw_collect (current_regcache, ARM_FPS_REGNUM, |
| 201 | fp + NWFPE_FPSR_OFFSET); |
| 202 | |
| 203 | /* Store the floating point registers. */ |
| 204 | for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++) |
| 205 | if (register_cached (regno)) |
| 206 | collect_nwfpe_register (current_regcache, regno, fp); |
| 207 | |
| 208 | ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp); |
| 209 | if (ret < 0) |
| 210 | { |
| 211 | warning (_("Unable to store floating point registers.")); |
| 212 | return; |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | /* Fetch a general register of the process and store into |
| 217 | regcache. */ |
| 218 | |
| 219 | static void |
| 220 | fetch_register (int regno) |
| 221 | { |
| 222 | int ret, tid; |
| 223 | elf_gregset_t regs; |
| 224 | |
| 225 | /* Get the thread id for the ptrace call. */ |
| 226 | tid = GET_THREAD_ID (inferior_ptid); |
| 227 | |
| 228 | ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| 229 | if (ret < 0) |
| 230 | { |
| 231 | warning (_("Unable to fetch general register.")); |
| 232 | return; |
| 233 | } |
| 234 | |
| 235 | if (regno >= ARM_A1_REGNUM && regno < ARM_PC_REGNUM) |
| 236 | regcache_raw_supply (current_regcache, regno, (char *) ®s[regno]); |
| 237 | |
| 238 | if (ARM_PS_REGNUM == regno) |
| 239 | { |
| 240 | if (arm_apcs_32) |
| 241 | regcache_raw_supply (current_regcache, ARM_PS_REGNUM, |
| 242 | (char *) ®s[ARM_CPSR_REGNUM]); |
| 243 | else |
| 244 | regcache_raw_supply (current_regcache, ARM_PS_REGNUM, |
| 245 | (char *) ®s[ARM_PC_REGNUM]); |
| 246 | } |
| 247 | |
| 248 | if (ARM_PC_REGNUM == regno) |
| 249 | { |
| 250 | regs[ARM_PC_REGNUM] = ADDR_BITS_REMOVE (regs[ARM_PC_REGNUM]); |
| 251 | regcache_raw_supply (current_regcache, ARM_PC_REGNUM, |
| 252 | (char *) ®s[ARM_PC_REGNUM]); |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | /* Fetch all general registers of the process and store into |
| 257 | regcache. */ |
| 258 | |
| 259 | static void |
| 260 | fetch_regs (void) |
| 261 | { |
| 262 | int ret, regno, tid; |
| 263 | elf_gregset_t regs; |
| 264 | |
| 265 | /* Get the thread id for the ptrace call. */ |
| 266 | tid = GET_THREAD_ID (inferior_ptid); |
| 267 | |
| 268 | ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| 269 | if (ret < 0) |
| 270 | { |
| 271 | warning (_("Unable to fetch general registers.")); |
| 272 | return; |
| 273 | } |
| 274 | |
| 275 | for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++) |
| 276 | regcache_raw_supply (current_regcache, regno, (char *) ®s[regno]); |
| 277 | |
| 278 | if (arm_apcs_32) |
| 279 | regcache_raw_supply (current_regcache, ARM_PS_REGNUM, |
| 280 | (char *) ®s[ARM_CPSR_REGNUM]); |
| 281 | else |
| 282 | regcache_raw_supply (current_regcache, ARM_PS_REGNUM, |
| 283 | (char *) ®s[ARM_PC_REGNUM]); |
| 284 | |
| 285 | regs[ARM_PC_REGNUM] = ADDR_BITS_REMOVE (regs[ARM_PC_REGNUM]); |
| 286 | regcache_raw_supply (current_regcache, ARM_PC_REGNUM, |
| 287 | (char *) ®s[ARM_PC_REGNUM]); |
| 288 | } |
| 289 | |
| 290 | /* Store all general registers of the process from the values in |
| 291 | regcache. */ |
| 292 | |
| 293 | static void |
| 294 | store_register (int regno) |
| 295 | { |
| 296 | int ret, tid; |
| 297 | elf_gregset_t regs; |
| 298 | |
| 299 | if (!register_cached (regno)) |
| 300 | return; |
| 301 | |
| 302 | /* Get the thread id for the ptrace call. */ |
| 303 | tid = GET_THREAD_ID (inferior_ptid); |
| 304 | |
| 305 | /* Get the general registers from the process. */ |
| 306 | ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| 307 | if (ret < 0) |
| 308 | { |
| 309 | warning (_("Unable to fetch general registers.")); |
| 310 | return; |
| 311 | } |
| 312 | |
| 313 | if (regno >= ARM_A1_REGNUM && regno <= ARM_PC_REGNUM) |
| 314 | regcache_raw_collect (current_regcache, regno, (char *) ®s[regno]); |
| 315 | else if (arm_apcs_32 && regno == ARM_PS_REGNUM) |
| 316 | regcache_raw_collect (current_regcache, regno, |
| 317 | (char *) ®s[ARM_CPSR_REGNUM]); |
| 318 | else if (!arm_apcs_32 && regno == ARM_PS_REGNUM) |
| 319 | regcache_raw_collect (current_regcache, ARM_PC_REGNUM, |
| 320 | (char *) ®s[ARM_PC_REGNUM]); |
| 321 | |
| 322 | ret = ptrace (PTRACE_SETREGS, tid, 0, ®s); |
| 323 | if (ret < 0) |
| 324 | { |
| 325 | warning (_("Unable to store general register.")); |
| 326 | return; |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | static void |
| 331 | store_regs (void) |
| 332 | { |
| 333 | int ret, regno, tid; |
| 334 | elf_gregset_t regs; |
| 335 | |
| 336 | /* Get the thread id for the ptrace call. */ |
| 337 | tid = GET_THREAD_ID (inferior_ptid); |
| 338 | |
| 339 | /* Fetch the general registers. */ |
| 340 | ret = ptrace (PTRACE_GETREGS, tid, 0, ®s); |
| 341 | if (ret < 0) |
| 342 | { |
| 343 | warning (_("Unable to fetch general registers.")); |
| 344 | return; |
| 345 | } |
| 346 | |
| 347 | for (regno = ARM_A1_REGNUM; regno <= ARM_PC_REGNUM; regno++) |
| 348 | { |
| 349 | if (register_cached (regno)) |
| 350 | regcache_raw_collect (current_regcache, regno, (char *) ®s[regno]); |
| 351 | } |
| 352 | |
| 353 | if (arm_apcs_32 && register_cached (ARM_PS_REGNUM)) |
| 354 | regcache_raw_collect (current_regcache, ARM_PS_REGNUM, |
| 355 | (char *) ®s[ARM_CPSR_REGNUM]); |
| 356 | |
| 357 | ret = ptrace (PTRACE_SETREGS, tid, 0, ®s); |
| 358 | |
| 359 | if (ret < 0) |
| 360 | { |
| 361 | warning (_("Unable to store general registers.")); |
| 362 | return; |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | /* Fetch registers from the child process. Fetch all registers if |
| 367 | regno == -1, otherwise fetch all general registers or all floating |
| 368 | point registers depending upon the value of regno. */ |
| 369 | |
| 370 | static void |
| 371 | arm_linux_fetch_inferior_registers (int regno) |
| 372 | { |
| 373 | if (-1 == regno) |
| 374 | { |
| 375 | fetch_regs (); |
| 376 | fetch_fpregs (); |
| 377 | } |
| 378 | else |
| 379 | { |
| 380 | if (regno < ARM_F0_REGNUM || regno > ARM_FPS_REGNUM) |
| 381 | fetch_register (regno); |
| 382 | |
| 383 | if (regno >= ARM_F0_REGNUM && regno <= ARM_FPS_REGNUM) |
| 384 | fetch_fpregister (regno); |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | /* Store registers back into the inferior. Store all registers if |
| 389 | regno == -1, otherwise store all general registers or all floating |
| 390 | point registers depending upon the value of regno. */ |
| 391 | |
| 392 | static void |
| 393 | arm_linux_store_inferior_registers (int regno) |
| 394 | { |
| 395 | if (-1 == regno) |
| 396 | { |
| 397 | store_regs (); |
| 398 | store_fpregs (); |
| 399 | } |
| 400 | else |
| 401 | { |
| 402 | if ((regno < ARM_F0_REGNUM) || (regno > ARM_FPS_REGNUM)) |
| 403 | store_register (regno); |
| 404 | |
| 405 | if ((regno >= ARM_F0_REGNUM) && (regno <= ARM_FPS_REGNUM)) |
| 406 | store_fpregister (regno); |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | /* Wrapper functions for the standard regset handling, used by |
| 411 | thread debugging. */ |
| 412 | |
| 413 | void |
| 414 | fill_gregset (gdb_gregset_t *gregsetp, int regno) |
| 415 | { |
| 416 | arm_linux_collect_gregset (NULL, current_regcache, regno, gregsetp, 0); |
| 417 | } |
| 418 | |
| 419 | void |
| 420 | supply_gregset (gdb_gregset_t *gregsetp) |
| 421 | { |
| 422 | arm_linux_supply_gregset (NULL, current_regcache, -1, gregsetp, 0); |
| 423 | } |
| 424 | |
| 425 | void |
| 426 | fill_fpregset (gdb_fpregset_t *fpregsetp, int regno) |
| 427 | { |
| 428 | arm_linux_collect_nwfpe (NULL, current_regcache, regno, fpregsetp, 0); |
| 429 | } |
| 430 | |
| 431 | /* Fill GDB's register array with the floating-point register values |
| 432 | in *fpregsetp. */ |
| 433 | |
| 434 | void |
| 435 | supply_fpregset (gdb_fpregset_t *fpregsetp) |
| 436 | { |
| 437 | arm_linux_supply_nwfpe (NULL, current_regcache, -1, fpregsetp, 0); |
| 438 | } |
| 439 | |
| 440 | int |
| 441 | arm_linux_kernel_u_size (void) |
| 442 | { |
| 443 | return (sizeof (struct user)); |
| 444 | } |
| 445 | |
| 446 | /* Fetch the thread-local storage pointer for libthread_db. */ |
| 447 | |
| 448 | ps_err_e |
| 449 | ps_get_thread_area (const struct ps_prochandle *ph, |
| 450 | lwpid_t lwpid, int idx, void **base) |
| 451 | { |
| 452 | if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) |
| 453 | return PS_ERR; |
| 454 | |
| 455 | /* IDX is the bias from the thread pointer to the beginning of the |
| 456 | thread descriptor. It has to be subtracted due to implementation |
| 457 | quirks in libthread_db. */ |
| 458 | *base = (void *) ((char *)*base - idx); |
| 459 | |
| 460 | return PS_OK; |
| 461 | } |
| 462 | |
| 463 | static unsigned int |
| 464 | get_linux_version (unsigned int *vmajor, |
| 465 | unsigned int *vminor, |
| 466 | unsigned int *vrelease) |
| 467 | { |
| 468 | struct utsname info; |
| 469 | char *pmajor, *pminor, *prelease, *tail; |
| 470 | |
| 471 | if (-1 == uname (&info)) |
| 472 | { |
| 473 | warning (_("Unable to determine GNU/Linux version.")); |
| 474 | return -1; |
| 475 | } |
| 476 | |
| 477 | pmajor = strtok (info.release, "."); |
| 478 | pminor = strtok (NULL, "."); |
| 479 | prelease = strtok (NULL, "."); |
| 480 | |
| 481 | *vmajor = (unsigned int) strtoul (pmajor, &tail, 0); |
| 482 | *vminor = (unsigned int) strtoul (pminor, &tail, 0); |
| 483 | *vrelease = (unsigned int) strtoul (prelease, &tail, 0); |
| 484 | |
| 485 | return ((*vmajor << 16) | (*vminor << 8) | *vrelease); |
| 486 | } |
| 487 | |
| 488 | void _initialize_arm_linux_nat (void); |
| 489 | |
| 490 | void |
| 491 | _initialize_arm_linux_nat (void) |
| 492 | { |
| 493 | struct target_ops *t; |
| 494 | |
| 495 | os_version = get_linux_version (&os_major, &os_minor, &os_release); |
| 496 | |
| 497 | /* Fill in the generic GNU/Linux methods. */ |
| 498 | t = linux_target (); |
| 499 | |
| 500 | /* Add our register access methods. */ |
| 501 | t->to_fetch_registers = arm_linux_fetch_inferior_registers; |
| 502 | t->to_store_registers = arm_linux_store_inferior_registers; |
| 503 | |
| 504 | /* Register the target. */ |
| 505 | linux_nat_add_target (t); |
| 506 | } |