gdb/amd64-linux-nat.c

   1 /* Native-dependent code for GNU/Linux x86-64.
   2
   3    Copyright (C) 2001-2014 Free Software Foundation, Inc.
   4    Contributed by Jiri Smid, SuSE Labs.
   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 "inferior.h"
  23 #include "regcache.h"
  24 #include "elf/common.h"
  25 #include <sys/ptrace.h>
  26 #include <asm/prctl.h>
  27 #include <sys/reg.h>
  28 #include "gregset.h"
  29 #include "gdb_proc_service.h"
  30
  31 #include "amd64-nat.h"
  32 #include "linux-nat.h"
  33 #include "amd64-tdep.h"
  34 #include "amd64-linux-tdep.h"
  35 #include "i386-linux-tdep.h"
  36 #include "i386-xstate.h"
  37
  38 #include "x86-linux-nat.h"
  39
  40 /* Mapping between the general-purpose registers in GNU/Linux x86-64
  41    `struct user' format and GDB's register cache layout for GNU/Linux
  42    i386.
  43
  44    Note that most GNU/Linux x86-64 registers are 64-bit, while the
  45    GNU/Linux i386 registers are all 32-bit, but since we're
  46    little-endian we get away with that.  */
  47
  48 /* From <sys/reg.h> on GNU/Linux i386.  */
  49 static int amd64_linux_gregset32_reg_offset[] =
  50 {
  51   RAX * 8, RCX * 8,             /* %eax, %ecx */
  52   RDX * 8, RBX * 8,             /* %edx, %ebx */
  53   RSP * 8, RBP * 8,             /* %esp, %ebp */
  54   RSI * 8, RDI * 8,             /* %esi, %edi */
  55   RIP * 8, EFLAGS * 8,          /* %eip, %eflags */
  56   CS * 8, SS * 8,               /* %cs, %ss */
  57   DS * 8, ES * 8,               /* %ds, %es */
  58   FS * 8, GS * 8,               /* %fs, %gs */
  59   -1, -1, -1, -1, -1, -1, -1, -1,
  60   -1, -1, -1, -1, -1, -1, -1, -1,
  61   -1, -1, -1, -1, -1, -1, -1, -1, -1,
  62   -1, -1, -1, -1, -1, -1, -1, -1,
  63   -1, -1, -1, -1,                 /* MPX registers BND0 ... BND3.  */
  64   -1, -1,                         /* MPX registers BNDCFGU, BNDSTATUS.  */
  65   -1, -1, -1, -1, -1, -1, -1, -1, /* k0 ... k7 (AVX512)  */
  66   -1, -1, -1, -1, -1, -1, -1, -1, /* zmm0 ... zmm7 (AVX512)  */
  67   ORIG_RAX * 8                    /* "orig_eax"  */
  68 };
  69 \f
  70
  71 /* Transfering the general-purpose registers between GDB, inferiors
  72    and core files.  */
  73
  74 /* Fill GDB's register cache with the general-purpose register values
  75    in *GREGSETP.  */
  76
  77 void
  78 supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
  79 {
  80   amd64_supply_native_gregset (regcache, gregsetp, -1);
  81 }
  82
  83 /* Fill register REGNUM (if it is a general-purpose register) in
  84    *GREGSETP with the value in GDB's register cache.  If REGNUM is -1,
  85    do this for all registers.  */
  86
  87 void
  88 fill_gregset (const struct regcache *regcache,
  89               elf_gregset_t *gregsetp, int regnum)
  90 {
  91   amd64_collect_native_gregset (regcache, gregsetp, regnum);
  92 }
  93
  94 /* Transfering floating-point registers between GDB, inferiors and cores.  */
  95
  96 /* Fill GDB's register cache with the floating-point and SSE register
  97    values in *FPREGSETP.  */
  98
  99 void
 100 supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp)
 101 {
 102   amd64_supply_fxsave (regcache, -1, fpregsetp);
 103 }
 104
 105 /* Fill register REGNUM (if it is a floating-point or SSE register) in
 106    *FPREGSETP with the value in GDB's register cache.  If REGNUM is
 107    -1, do this for all registers.  */
 108
 109 void
 110 fill_fpregset (const struct regcache *regcache,
 111                elf_fpregset_t *fpregsetp, int regnum)
 112 {
 113   amd64_collect_fxsave (regcache, regnum, fpregsetp);
 114 }
 115 \f
 116
 117 /* Transferring arbitrary registers between GDB and inferior.  */
 118
 119 /* Fetch register REGNUM from the child process.  If REGNUM is -1, do
 120    this for all registers (including the floating point and SSE
 121    registers).  */
 122
 123 static void
 124 amd64_linux_fetch_inferior_registers (struct target_ops *ops,
 125                                       struct regcache *regcache, int regnum)
 126 {
 127   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 128   int tid;
 129
 130   /* GNU/Linux LWP ID's are process ID's.  */
 131   tid = ptid_get_lwp (inferior_ptid);
 132   if (tid == 0)
 133     tid = ptid_get_pid (inferior_ptid); /* Not a threaded program.  */
 134
 135   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
 136     {
 137       elf_gregset_t regs;
 138
 139       if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
 140         perror_with_name (_("Couldn't get registers"));
 141
 142       amd64_supply_native_gregset (regcache, &regs, -1);
 143       if (regnum != -1)
 144         return;
 145     }
 146
 147   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
 148     {
 149       elf_fpregset_t fpregs;
 150
 151       if (have_ptrace_getregset)
 152         {
 153           char xstateregs[I386_XSTATE_MAX_SIZE];
 154           struct iovec iov;
 155
 156           iov.iov_base = xstateregs;
 157           iov.iov_len = sizeof (xstateregs);
 158           if (ptrace (PTRACE_GETREGSET, tid,
 159                       (unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
 160             perror_with_name (_("Couldn't get extended state status"));
 161
 162           amd64_supply_xsave (regcache, -1, xstateregs);
 163         }
 164       else
 165         {
 166           if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
 167             perror_with_name (_("Couldn't get floating point status"));
 168
 169           amd64_supply_fxsave (regcache, -1, &fpregs);
 170         }
 171     }
 172 }
 173
 174 /* Store register REGNUM back into the child process.  If REGNUM is
 175    -1, do this for all registers (including the floating-point and SSE
 176    registers).  */
 177
 178 static void
 179 amd64_linux_store_inferior_registers (struct target_ops *ops,
 180                                       struct regcache *regcache, int regnum)
 181 {
 182   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 183   int tid;
 184
 185   /* GNU/Linux LWP ID's are process ID's.  */
 186   tid = ptid_get_lwp (inferior_ptid);
 187   if (tid == 0)
 188     tid = ptid_get_pid (inferior_ptid); /* Not a threaded program.  */
 189
 190   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
 191     {
 192       elf_gregset_t regs;
 193
 194       if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
 195         perror_with_name (_("Couldn't get registers"));
 196
 197       amd64_collect_native_gregset (regcache, &regs, regnum);
 198
 199       if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
 200         perror_with_name (_("Couldn't write registers"));
 201
 202       if (regnum != -1)
 203         return;
 204     }
 205
 206   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
 207     {
 208       elf_fpregset_t fpregs;
 209
 210       if (have_ptrace_getregset)
 211         {
 212           char xstateregs[I386_XSTATE_MAX_SIZE];
 213           struct iovec iov;
 214
 215           iov.iov_base = xstateregs;
 216           iov.iov_len = sizeof (xstateregs);
 217           if (ptrace (PTRACE_GETREGSET, tid,
 218                       (unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
 219             perror_with_name (_("Couldn't get extended state status"));
 220
 221           amd64_collect_xsave (regcache, regnum, xstateregs, 0);
 222
 223           if (ptrace (PTRACE_SETREGSET, tid,
 224                       (unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
 225             perror_with_name (_("Couldn't write extended state status"));
 226         }
 227       else
 228         {
 229           if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
 230             perror_with_name (_("Couldn't get floating point status"));
 231
 232           amd64_collect_fxsave (regcache, regnum, &fpregs);
 233
 234           if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0)
 235             perror_with_name (_("Couldn't write floating point status"));
 236         }
 237     }
 238 }
 239 \f
 240
 241 /* This function is called by libthread_db as part of its handling of
 242    a request for a thread's local storage address.  */
 243
 244 ps_err_e
 245 ps_get_thread_area (const struct ps_prochandle *ph,
 246                     lwpid_t lwpid, int idx, void **base)
 247 {
 248   if (gdbarch_bfd_arch_info (target_gdbarch ())->bits_per_word == 32)
 249     {
 250       unsigned int base_addr;
 251       ps_err_e result;
 252
 253       result = x86_linux_get_thread_area (lwpid, (void *) (long) idx,
 254                                           &base_addr);
 255       if (result == PS_OK)
 256         {
 257           /* Extend the value to 64 bits.  Here it's assumed that
 258              a "long" and a "void *" are the same.  */
 259           (*base) = (void *) (long) base_addr;
 260         }
 261       return result;
 262     }
 263   else
 264     {
 265       /* This definition comes from prctl.h, but some kernels may not
 266          have it.  */
 267 #ifndef PTRACE_ARCH_PRCTL
 268 #define PTRACE_ARCH_PRCTL      30
 269 #endif
 270       /* FIXME: ezannoni-2003-07-09 see comment above about include
 271          file order.  We could be getting bogus values for these two.  */
 272       gdb_assert (FS < ELF_NGREG);
 273       gdb_assert (GS < ELF_NGREG);
 274       switch (idx)
 275         {
 276         case FS:
 277 #ifdef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
 278             {
 279               /* PTRACE_ARCH_PRCTL is obsolete since 2.6.25, where the
 280                  fs_base and gs_base fields of user_regs_struct can be
 281                  used directly.  */
 282               unsigned long fs;
 283               errno = 0;
 284               fs = ptrace (PTRACE_PEEKUSER, lwpid,
 285                            offsetof (struct user_regs_struct, fs_base), 0);
 286               if (errno == 0)
 287                 {
 288                   *base = (void *) fs;
 289                   return PS_OK;
 290                 }
 291             }
 292 #endif
 293           if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0)
 294             return PS_OK;
 295           break;
 296         case GS:
 297 #ifdef HAVE_STRUCT_USER_REGS_STRUCT_GS_BASE
 298             {
 299               unsigned long gs;
 300               errno = 0;
 301               gs = ptrace (PTRACE_PEEKUSER, lwpid,
 302                            offsetof (struct user_regs_struct, gs_base), 0);
 303               if (errno == 0)
 304                 {
 305                   *base = (void *) gs;
 306                   return PS_OK;
 307                 }
 308             }
 309 #endif
 310           if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0)
 311             return PS_OK;
 312           break;
 313         default:                   /* Should not happen.  */
 314           return PS_BADADDR;
 315         }
 316     }
 317   return PS_ERR;               /* ptrace failed.  */
 318 }
 319 \f
 320
 321 /* When GDB is built as a 64-bit application on linux, the
 322    PTRACE_GETSIGINFO data is always presented in 64-bit layout.  Since
 323    debugging a 32-bit inferior with a 64-bit GDB should look the same
 324    as debugging it with a 32-bit GDB, we do the 32-bit <-> 64-bit
 325    conversion in-place ourselves.  */
 326
 327 /* These types below (compat_*) define a siginfo type that is layout
 328    compatible with the siginfo type exported by the 32-bit userspace
 329    support.  */
 330
 331 typedef int compat_int_t;
 332 typedef unsigned int compat_uptr_t;
 333
 334 typedef int compat_time_t;
 335 typedef int compat_timer_t;
 336 typedef int compat_clock_t;
 337
 338 struct compat_timeval
 339 {
 340   compat_time_t tv_sec;
 341   int tv_usec;
 342 };
 343
 344 typedef union compat_sigval
 345 {
 346   compat_int_t sival_int;
 347   compat_uptr_t sival_ptr;
 348 } compat_sigval_t;
 349
 350 typedef struct compat_siginfo
 351 {
 352   int si_signo;
 353   int si_errno;
 354   int si_code;
 355
 356   union
 357   {
 358     int _pad[((128 / sizeof (int)) - 3)];
 359
 360     /* kill() */
 361     struct
 362     {
 363       unsigned int _pid;
 364       unsigned int _uid;
 365     } _kill;
 366
 367     /* POSIX.1b timers */
 368     struct
 369     {
 370       compat_timer_t _tid;
 371       int _overrun;
 372       compat_sigval_t _sigval;
 373     } _timer;
 374
 375     /* POSIX.1b signals */
 376     struct
 377     {
 378       unsigned int _pid;
 379       unsigned int _uid;
 380       compat_sigval_t _sigval;
 381     } _rt;
 382
 383     /* SIGCHLD */
 384     struct
 385     {
 386       unsigned int _pid;
 387       unsigned int _uid;
 388       int _status;
 389       compat_clock_t _utime;
 390       compat_clock_t _stime;
 391     } _sigchld;
 392
 393     /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
 394     struct
 395     {
 396       unsigned int _addr;
 397     } _sigfault;
 398
 399     /* SIGPOLL */
 400     struct
 401     {
 402       int _band;
 403       int _fd;
 404     } _sigpoll;
 405   } _sifields;
 406 } compat_siginfo_t;
 407
 408 /* For x32, clock_t in _sigchld is 64bit aligned at 4 bytes.  */
 409 typedef struct compat_x32_clock
 410 {
 411   int lower;
 412   int upper;
 413 } compat_x32_clock_t;
 414
 415 typedef struct compat_x32_siginfo
 416 {
 417   int si_signo;
 418   int si_errno;
 419   int si_code;
 420
 421   union
 422   {
 423     int _pad[((128 / sizeof (int)) - 3)];
 424
 425     /* kill() */
 426     struct
 427     {
 428       unsigned int _pid;
 429       unsigned int _uid;
 430     } _kill;
 431
 432     /* POSIX.1b timers */
 433     struct
 434     {
 435       compat_timer_t _tid;
 436       int _overrun;
 437       compat_sigval_t _sigval;
 438     } _timer;
 439
 440     /* POSIX.1b signals */
 441     struct
 442     {
 443       unsigned int _pid;
 444       unsigned int _uid;
 445       compat_sigval_t _sigval;
 446     } _rt;
 447
 448     /* SIGCHLD */
 449     struct
 450     {
 451       unsigned int _pid;
 452       unsigned int _uid;
 453       int _status;
 454       compat_x32_clock_t _utime;
 455       compat_x32_clock_t _stime;
 456     } _sigchld;
 457
 458     /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
 459     struct
 460     {
 461       unsigned int _addr;
 462     } _sigfault;
 463
 464     /* SIGPOLL */
 465     struct
 466     {
 467       int _band;
 468       int _fd;
 469     } _sigpoll;
 470   } _sifields;
 471 } compat_x32_siginfo_t;
 472
 473 #define cpt_si_pid _sifields._kill._pid
 474 #define cpt_si_uid _sifields._kill._uid
 475 #define cpt_si_timerid _sifields._timer._tid
 476 #define cpt_si_overrun _sifields._timer._overrun
 477 #define cpt_si_status _sifields._sigchld._status
 478 #define cpt_si_utime _sifields._sigchld._utime
 479 #define cpt_si_stime _sifields._sigchld._stime
 480 #define cpt_si_ptr _sifields._rt._sigval.sival_ptr
 481 #define cpt_si_addr _sifields._sigfault._addr
 482 #define cpt_si_band _sifields._sigpoll._band
 483 #define cpt_si_fd _sifields._sigpoll._fd
 484
 485 /* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun.
 486    In their place is si_timer1,si_timer2.  */
 487 #ifndef si_timerid
 488 #define si_timerid si_timer1
 489 #endif
 490 #ifndef si_overrun
 491 #define si_overrun si_timer2
 492 #endif
 493
 494 static void
 495 compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from)
 496 {
 497   memset (to, 0, sizeof (*to));
 498
 499   to->si_signo = from->si_signo;
 500   to->si_errno = from->si_errno;
 501   to->si_code = from->si_code;
 502
 503   if (to->si_code == SI_TIMER)
 504     {
 505       to->cpt_si_timerid = from->si_timerid;
 506       to->cpt_si_overrun = from->si_overrun;
 507       to->cpt_si_ptr = (intptr_t) from->si_ptr;
 508     }
 509   else if (to->si_code == SI_USER)
 510     {
 511       to->cpt_si_pid = from->si_pid;
 512       to->cpt_si_uid = from->si_uid;
 513     }
 514   else if (to->si_code < 0)
 515     {
 516       to->cpt_si_pid = from->si_pid;
 517       to->cpt_si_uid = from->si_uid;
 518       to->cpt_si_ptr = (intptr_t) from->si_ptr;
 519     }
 520   else
 521     {
 522       switch (to->si_signo)
 523         {
 524         case SIGCHLD:
 525           to->cpt_si_pid = from->si_pid;
 526           to->cpt_si_uid = from->si_uid;
 527           to->cpt_si_status = from->si_status;
 528           to->cpt_si_utime = from->si_utime;
 529           to->cpt_si_stime = from->si_stime;
 530           break;
 531         case SIGILL:
 532         case SIGFPE:
 533         case SIGSEGV:
 534         case SIGBUS:
 535           to->cpt_si_addr = (intptr_t) from->si_addr;
 536           break;
 537         case SIGPOLL:
 538           to->cpt_si_band = from->si_band;
 539           to->cpt_si_fd = from->si_fd;
 540           break;
 541         default:
 542           to->cpt_si_pid = from->si_pid;
 543           to->cpt_si_uid = from->si_uid;
 544           to->cpt_si_ptr = (intptr_t) from->si_ptr;
 545           break;
 546         }
 547     }
 548 }
 549
 550 static void
 551 siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from)
 552 {
 553   memset (to, 0, sizeof (*to));
 554
 555   to->si_signo = from->si_signo;
 556   to->si_errno = from->si_errno;
 557   to->si_code = from->si_code;
 558
 559   if (to->si_code == SI_TIMER)
 560     {
 561       to->si_timerid = from->cpt_si_timerid;
 562       to->si_overrun = from->cpt_si_overrun;
 563       to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
 564     }
 565   else if (to->si_code == SI_USER)
 566     {
 567       to->si_pid = from->cpt_si_pid;
 568       to->si_uid = from->cpt_si_uid;
 569     }
 570   if (to->si_code < 0)
 571     {
 572       to->si_pid = from->cpt_si_pid;
 573       to->si_uid = from->cpt_si_uid;
 574       to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
 575     }
 576   else
 577     {
 578       switch (to->si_signo)
 579         {
 580         case SIGCHLD:
 581           to->si_pid = from->cpt_si_pid;
 582           to->si_uid = from->cpt_si_uid;
 583           to->si_status = from->cpt_si_status;
 584           to->si_utime = from->cpt_si_utime;
 585           to->si_stime = from->cpt_si_stime;
 586           break;
 587         case SIGILL:
 588         case SIGFPE:
 589         case SIGSEGV:
 590         case SIGBUS:
 591           to->si_addr = (void *) (intptr_t) from->cpt_si_addr;
 592           break;
 593         case SIGPOLL:
 594           to->si_band = from->cpt_si_band;
 595           to->si_fd = from->cpt_si_fd;
 596           break;
 597         default:
 598           to->si_pid = from->cpt_si_pid;
 599           to->si_uid = from->cpt_si_uid;
 600           to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr;
 601           break;
 602         }
 603     }
 604 }
 605
 606 static void
 607 compat_x32_siginfo_from_siginfo (compat_x32_siginfo_t *to,
 608                                  siginfo_t *from)
 609 {
 610   memset (to, 0, sizeof (*to));
 611
 612   to->si_signo = from->si_signo;
 613   to->si_errno = from->si_errno;
 614   to->si_code = from->si_code;
 615
 616   if (to->si_code == SI_TIMER)
 617     {
 618       to->cpt_si_timerid = from->si_timerid;
 619       to->cpt_si_overrun = from->si_overrun;
 620       to->cpt_si_ptr = (intptr_t) from->si_ptr;
 621     }
 622   else if (to->si_code == SI_USER)
 623     {
 624       to->cpt_si_pid = from->si_pid;
 625       to->cpt_si_uid = from->si_uid;
 626     }
 627   else if (to->si_code < 0)
 628     {
 629       to->cpt_si_pid = from->si_pid;
 630       to->cpt_si_uid = from->si_uid;
 631       to->cpt_si_ptr = (intptr_t) from->si_ptr;
 632     }
 633   else
 634     {
 635       switch (to->si_signo)
 636         {
 637         case SIGCHLD:
 638           to->cpt_si_pid = from->si_pid;
 639           to->cpt_si_uid = from->si_uid;
 640           to->cpt_si_status = from->si_status;
 641           memcpy (&to->cpt_si_utime, &from->si_utime,
 642                   sizeof (to->cpt_si_utime));
 643           memcpy (&to->cpt_si_stime, &from->si_stime,
 644                   sizeof (to->cpt_si_stime));
 645           break;
 646         case SIGILL:
 647         case SIGFPE:
 648         case SIGSEGV:
 649         case SIGBUS:
 650           to->cpt_si_addr = (intptr_t) from->si_addr;
 651           break;
 652         case SIGPOLL:
 653           to->cpt_si_band = from->si_band;
 654           to->cpt_si_fd = from->si_fd;
 655           break;
 656         default:
 657           to->cpt_si_pid = from->si_pid;
 658           to->cpt_si_uid = from->si_uid;
 659           to->cpt_si_ptr = (intptr_t) from->si_ptr;
 660           break;
 661         }
 662     }
 663 }
 664
 665 static void
 666 siginfo_from_compat_x32_siginfo (siginfo_t *to,
 667                                  compat_x32_siginfo_t *from)
 668 {
 669   memset (to, 0, sizeof (*to));
 670
 671   to->si_signo = from->si_signo;
 672   to->si_errno = from->si_errno;
 673   to->si_code = from->si_code;
 674
 675   if (to->si_code == SI_TIMER)
 676     {
 677       to->si_timerid = from->cpt_si_timerid;
 678       to->si_overrun = from->cpt_si_overrun;
 679       to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
 680     }
 681   else if (to->si_code == SI_USER)
 682     {
 683       to->si_pid = from->cpt_si_pid;
 684       to->si_uid = from->cpt_si_uid;
 685     }
 686   if (to->si_code < 0)
 687     {
 688       to->si_pid = from->cpt_si_pid;
 689       to->si_uid = from->cpt_si_uid;
 690       to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
 691     }
 692   else
 693     {
 694       switch (to->si_signo)
 695         {
 696         case SIGCHLD:
 697           to->si_pid = from->cpt_si_pid;
 698           to->si_uid = from->cpt_si_uid;
 699           to->si_status = from->cpt_si_status;
 700           memcpy (&to->si_utime, &from->cpt_si_utime,
 701                   sizeof (to->si_utime));
 702           memcpy (&to->si_stime, &from->cpt_si_stime,
 703                   sizeof (to->si_stime));
 704           break;
 705         case SIGILL:
 706         case SIGFPE:
 707         case SIGSEGV:
 708         case SIGBUS:
 709           to->si_addr = (void *) (intptr_t) from->cpt_si_addr;
 710           break;
 711         case SIGPOLL:
 712           to->si_band = from->cpt_si_band;
 713           to->si_fd = from->cpt_si_fd;
 714           break;
 715         default:
 716           to->si_pid = from->cpt_si_pid;
 717           to->si_uid = from->cpt_si_uid;
 718           to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr;
 719           break;
 720         }
 721     }
 722 }
 723
 724 /* Convert a native/host siginfo object, into/from the siginfo in the
 725    layout of the inferiors' architecture.  Returns true if any
 726    conversion was done; false otherwise.  If DIRECTION is 1, then copy
 727    from INF to NATIVE.  If DIRECTION is 0, copy from NATIVE to
 728    INF.  */
 729
 730 static int
 731 amd64_linux_siginfo_fixup (siginfo_t *native, gdb_byte *inf, int direction)
 732 {
 733   struct gdbarch *gdbarch = get_frame_arch (get_current_frame ());
 734
 735   /* Is the inferior 32-bit?  If so, then do fixup the siginfo
 736      object.  */
 737   if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32)
 738     {
 739       gdb_assert (sizeof (siginfo_t) == sizeof (compat_siginfo_t));
 740
 741       if (direction == 0)
 742         compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, native);
 743       else
 744         siginfo_from_compat_siginfo (native, (struct compat_siginfo *) inf);
 745
 746       return 1;
 747     }
 748   /* No fixup for native x32 GDB.  */
 749   else if (gdbarch_addr_bit (gdbarch) == 32 && sizeof (void *) == 8)
 750     {
 751       gdb_assert (sizeof (siginfo_t) == sizeof (compat_x32_siginfo_t));
 752
 753       if (direction == 0)
 754         compat_x32_siginfo_from_siginfo ((struct compat_x32_siginfo *) inf,
 755                                          native);
 756       else
 757         siginfo_from_compat_x32_siginfo (native,
 758                                          (struct compat_x32_siginfo *) inf);
 759
 760       return 1;
 761     }
 762   else
 763     return 0;
 764 }
 765 \f
 766
 767 /* Provide a prototype to silence -Wmissing-prototypes.  */
 768 void _initialize_amd64_linux_nat (void);
 769
 770 void
 771 _initialize_amd64_linux_nat (void)
 772 {
 773   struct target_ops *t;
 774
 775   amd64_native_gregset32_reg_offset = amd64_linux_gregset32_reg_offset;
 776   amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS;
 777   amd64_native_gregset64_reg_offset = amd64_linux_gregset_reg_offset;
 778   amd64_native_gregset64_num_regs = AMD64_LINUX_NUM_REGS;
 779
 780   gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset)
 781               == amd64_native_gregset32_num_regs);
 782
 783   /* Create a generic x86 GNU/Linux target.  */
 784   t = x86_linux_create_target ();
 785
 786   /* Add our register access methods.  */
 787   t->to_fetch_registers = amd64_linux_fetch_inferior_registers;
 788   t->to_store_registers = amd64_linux_store_inferior_registers;
 789
 790   /* Add the target.  */
 791   x86_linux_add_target (t);
 792
 793   /* Add our siginfo layout converter.  */
 794   linux_nat_set_siginfo_fixup (t, amd64_linux_siginfo_fixup);
 795 }