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 "gdbcore.h"
  24 #include "regcache.h"
  25 #include "regset.h"
  26 #include "linux-nat.h"
  27 #include "amd64-linux-tdep.h"
  28 #include "nat/linux-btrace.h"
  29 #include "btrace.h"
  30
  31 #include "gdb_assert.h"
  32 #include <string.h>
  33 #include "elf/common.h"
  34 #include <sys/uio.h>
  35 #include <sys/ptrace.h>
  36 #include <sys/debugreg.h>
  37 #include <sys/syscall.h>
  38 #include <sys/procfs.h>
  39 #include <sys/user.h>
  40 #include <asm/prctl.h>
  41 /* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after
  42    <asm/ptrace.h> because the latter redefines FS and GS for no apparent
  43    reason, and those definitions don't match the ones that libpthread_db
  44    uses, which come from <sys/reg.h>.  */
  45 /* ezannoni-2003-07-09: I think this is fixed.  The extraneous defs have
  46    been removed from ptrace.h in the kernel.  However, better safe than
  47    sorry.  */
  48 #include <asm/ptrace.h>
  49 #include <sys/reg.h>
  50 #include "gdb_proc_service.h"
  51
  52 /* Prototypes for supply_gregset etc.  */
  53 #include "gregset.h"
  54
  55 #include "amd64-tdep.h"
  56 #include "i386-linux-tdep.h"
  57 #include "amd64-nat.h"
  58 #include "i386-nat.h"
  59 #include "i386-xstate.h"
  60
  61 #include "x86-linux-nat.h"
  62
  63 /* Mapping between the general-purpose registers in GNU/Linux x86-64
  64    `struct user' format and GDB's register cache layout for GNU/Linux
  65    i386.
  66
  67    Note that most GNU/Linux x86-64 registers are 64-bit, while the
  68    GNU/Linux i386 registers are all 32-bit, but since we're
  69    little-endian we get away with that.  */
  70
  71 /* From <sys/reg.h> on GNU/Linux i386.  */
  72 static int amd64_linux_gregset32_reg_offset[] =
  73 {
  74   RAX * 8, RCX * 8,             /* %eax, %ecx */
  75   RDX * 8, RBX * 8,             /* %edx, %ebx */
  76   RSP * 8, RBP * 8,             /* %esp, %ebp */
  77   RSI * 8, RDI * 8,             /* %esi, %edi */
  78   RIP * 8, EFLAGS * 8,          /* %eip, %eflags */
  79   CS * 8, SS * 8,               /* %cs, %ss */
  80   DS * 8, ES * 8,               /* %ds, %es */
  81   FS * 8, GS * 8,               /* %fs, %gs */
  82   -1, -1, -1, -1, -1, -1, -1, -1,
  83   -1, -1, -1, -1, -1, -1, -1, -1,
  84   -1, -1, -1, -1, -1, -1, -1, -1, -1,
  85   -1, -1, -1, -1, -1, -1, -1, -1,
  86   -1, -1, -1, -1,                 /* MPX registers BND0 ... BND3.  */
  87   -1, -1,                         /* MPX registers BNDCFGU, BNDSTATUS.  */
  88   -1, -1, -1, -1, -1, -1, -1, -1, /* k0 ... k7 (AVX512)  */
  89   -1, -1, -1, -1, -1, -1, -1, -1, /* zmm0 ... zmm7 (AVX512)  */
  90   ORIG_RAX * 8                    /* "orig_eax"  */
  91 };
  92 \f
  93
  94 /* Transfering the general-purpose registers between GDB, inferiors
  95    and core files.  */
  96
  97 /* Fill GDB's register cache with the general-purpose register values
  98    in *GREGSETP.  */
  99
 100 void
 101 supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
 102 {
 103   amd64_supply_native_gregset (regcache, gregsetp, -1);
 104 }
 105
 106 /* Fill register REGNUM (if it is a general-purpose register) in
 107    *GREGSETP with the value in GDB's register cache.  If REGNUM is -1,
 108    do this for all registers.  */
 109
 110 void
 111 fill_gregset (const struct regcache *regcache,
 112               elf_gregset_t *gregsetp, int regnum)
 113 {
 114   amd64_collect_native_gregset (regcache, gregsetp, regnum);
 115 }
 116
 117 /* Transfering floating-point registers between GDB, inferiors and cores.  */
 118
 119 /* Fill GDB's register cache with the floating-point and SSE register
 120    values in *FPREGSETP.  */
 121
 122 void
 123 supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp)
 124 {
 125   amd64_supply_fxsave (regcache, -1, fpregsetp);
 126 }
 127
 128 /* Fill register REGNUM (if it is a floating-point or SSE register) in
 129    *FPREGSETP with the value in GDB's register cache.  If REGNUM is
 130    -1, do this for all registers.  */
 131
 132 void
 133 fill_fpregset (const struct regcache *regcache,
 134                elf_fpregset_t *fpregsetp, int regnum)
 135 {
 136   amd64_collect_fxsave (regcache, regnum, fpregsetp);
 137 }
 138 \f
 139
 140 /* Transferring arbitrary registers between GDB and inferior.  */
 141
 142 /* Fetch register REGNUM from the child process.  If REGNUM is -1, do
 143    this for all registers (including the floating point and SSE
 144    registers).  */
 145
 146 static void
 147 amd64_linux_fetch_inferior_registers (struct target_ops *ops,
 148                                       struct regcache *regcache, int regnum)
 149 {
 150   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 151   int tid;
 152
 153   /* GNU/Linux LWP ID's are process ID's.  */
 154   tid = ptid_get_lwp (inferior_ptid);
 155   if (tid == 0)
 156     tid = ptid_get_pid (inferior_ptid); /* Not a threaded program.  */
 157
 158   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
 159     {
 160       elf_gregset_t regs;
 161
 162       if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
 163         perror_with_name (_("Couldn't get registers"));
 164
 165       amd64_supply_native_gregset (regcache, &regs, -1);
 166       if (regnum != -1)
 167         return;
 168     }
 169
 170   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
 171     {
 172       elf_fpregset_t fpregs;
 173
 174       if (have_ptrace_getregset)
 175         {
 176           char xstateregs[I386_XSTATE_MAX_SIZE];
 177           struct iovec iov;
 178
 179           iov.iov_base = xstateregs;
 180           iov.iov_len = sizeof (xstateregs);
 181           if (ptrace (PTRACE_GETREGSET, tid,
 182                       (unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
 183             perror_with_name (_("Couldn't get extended state status"));
 184
 185           amd64_supply_xsave (regcache, -1, xstateregs);
 186         }
 187       else
 188         {
 189           if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
 190             perror_with_name (_("Couldn't get floating point status"));
 191
 192           amd64_supply_fxsave (regcache, -1, &fpregs);
 193         }
 194     }
 195 }
 196
 197 /* Store register REGNUM back into the child process.  If REGNUM is
 198    -1, do this for all registers (including the floating-point and SSE
 199    registers).  */
 200
 201 static void
 202 amd64_linux_store_inferior_registers (struct target_ops *ops,
 203                                       struct regcache *regcache, int regnum)
 204 {
 205   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 206   int tid;
 207
 208   /* GNU/Linux LWP ID's are process ID's.  */
 209   tid = ptid_get_lwp (inferior_ptid);
 210   if (tid == 0)
 211     tid = ptid_get_pid (inferior_ptid); /* Not a threaded program.  */
 212
 213   if (regnum == -1 || amd64_native_gregset_supplies_p (gdbarch, regnum))
 214     {
 215       elf_gregset_t regs;
 216
 217       if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)
 218         perror_with_name (_("Couldn't get registers"));
 219
 220       amd64_collect_native_gregset (regcache, &regs, regnum);
 221
 222       if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)
 223         perror_with_name (_("Couldn't write registers"));
 224
 225       if (regnum != -1)
 226         return;
 227     }
 228
 229   if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
 230     {
 231       elf_fpregset_t fpregs;
 232
 233       if (have_ptrace_getregset)
 234         {
 235           char xstateregs[I386_XSTATE_MAX_SIZE];
 236           struct iovec iov;
 237
 238           iov.iov_base = xstateregs;
 239           iov.iov_len = sizeof (xstateregs);
 240           if (ptrace (PTRACE_GETREGSET, tid,
 241                       (unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
 242             perror_with_name (_("Couldn't get extended state status"));
 243
 244           amd64_collect_xsave (regcache, regnum, xstateregs, 0);
 245
 246           if (ptrace (PTRACE_SETREGSET, tid,
 247                       (unsigned int) NT_X86_XSTATE, (long) &iov) < 0)
 248             perror_with_name (_("Couldn't write extended state status"));
 249         }
 250       else
 251         {
 252           if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0)
 253             perror_with_name (_("Couldn't get floating point status"));
 254
 255           amd64_collect_fxsave (regcache, regnum, &fpregs);
 256
 257           if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0)
 258             perror_with_name (_("Couldn't write floating point status"));
 259         }
 260     }
 261 }
 262 \f
 263
 264 /* This function is called by libthread_db as part of its handling of
 265    a request for a thread's local storage address.  */
 266
 267 ps_err_e
 268 ps_get_thread_area (const struct ps_prochandle *ph,
 269                     lwpid_t lwpid, int idx, void **base)
 270 {
 271   if (gdbarch_bfd_arch_info (target_gdbarch ())->bits_per_word == 32)
 272     {
 273       unsigned int base_addr;
 274       ps_err_e result;
 275
 276       result = x86_linux_get_thread_area (lwpid, (void *) (long) idx,
 277                                           &base_addr);
 278       if (result == PS_OK)
 279         {
 280           /* Extend the value to 64 bits.  Here it's assumed that
 281              a "long" and a "void *" are the same.  */
 282           (*base) = (void *) (long) base_addr;
 283         }
 284       return result;
 285     }
 286   else
 287     {
 288       /* This definition comes from prctl.h, but some kernels may not
 289          have it.  */
 290 #ifndef PTRACE_ARCH_PRCTL
 291 #define PTRACE_ARCH_PRCTL      30
 292 #endif
 293       /* FIXME: ezannoni-2003-07-09 see comment above about include
 294          file order.  We could be getting bogus values for these two.  */
 295       gdb_assert (FS < ELF_NGREG);
 296       gdb_assert (GS < ELF_NGREG);
 297       switch (idx)
 298         {
 299         case FS:
 300 #ifdef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
 301             {
 302               /* PTRACE_ARCH_PRCTL is obsolete since 2.6.25, where the
 303                  fs_base and gs_base fields of user_regs_struct can be
 304                  used directly.  */
 305               unsigned long fs;
 306               errno = 0;
 307               fs = ptrace (PTRACE_PEEKUSER, lwpid,
 308                            offsetof (struct user_regs_struct, fs_base), 0);
 309               if (errno == 0)
 310                 {
 311                   *base = (void *) fs;
 312                   return PS_OK;
 313                 }
 314             }
 315 #endif
 316           if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0)
 317             return PS_OK;
 318           break;
 319         case GS:
 320 #ifdef HAVE_STRUCT_USER_REGS_STRUCT_GS_BASE
 321             {
 322               unsigned long gs;
 323               errno = 0;
 324               gs = ptrace (PTRACE_PEEKUSER, lwpid,
 325                            offsetof (struct user_regs_struct, gs_base), 0);
 326               if (errno == 0)
 327                 {
 328                   *base = (void *) gs;
 329                   return PS_OK;
 330                 }
 331             }
 332 #endif
 333           if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0)
 334             return PS_OK;
 335           break;
 336         default:                   /* Should not happen.  */
 337           return PS_BADADDR;
 338         }
 339     }
 340   return PS_ERR;               /* ptrace failed.  */
 341 }
 342 \f
 343
 344 /* When GDB is built as a 64-bit application on linux, the
 345    PTRACE_GETSIGINFO data is always presented in 64-bit layout.  Since
 346    debugging a 32-bit inferior with a 64-bit GDB should look the same
 347    as debugging it with a 32-bit GDB, we do the 32-bit <-> 64-bit
 348    conversion in-place ourselves.  */
 349
 350 /* These types below (compat_*) define a siginfo type that is layout
 351    compatible with the siginfo type exported by the 32-bit userspace
 352    support.  */
 353
 354 typedef int compat_int_t;
 355 typedef unsigned int compat_uptr_t;
 356
 357 typedef int compat_time_t;
 358 typedef int compat_timer_t;
 359 typedef int compat_clock_t;
 360
 361 struct compat_timeval
 362 {
 363   compat_time_t tv_sec;
 364   int tv_usec;
 365 };
 366
 367 typedef union compat_sigval
 368 {
 369   compat_int_t sival_int;
 370   compat_uptr_t sival_ptr;
 371 } compat_sigval_t;
 372
 373 typedef struct compat_siginfo
 374 {
 375   int si_signo;
 376   int si_errno;
 377   int si_code;
 378
 379   union
 380   {
 381     int _pad[((128 / sizeof (int)) - 3)];
 382
 383     /* kill() */
 384     struct
 385     {
 386       unsigned int _pid;
 387       unsigned int _uid;
 388     } _kill;
 389
 390     /* POSIX.1b timers */
 391     struct
 392     {
 393       compat_timer_t _tid;
 394       int _overrun;
 395       compat_sigval_t _sigval;
 396     } _timer;
 397
 398     /* POSIX.1b signals */
 399     struct
 400     {
 401       unsigned int _pid;
 402       unsigned int _uid;
 403       compat_sigval_t _sigval;
 404     } _rt;
 405
 406     /* SIGCHLD */
 407     struct
 408     {
 409       unsigned int _pid;
 410       unsigned int _uid;
 411       int _status;
 412       compat_clock_t _utime;
 413       compat_clock_t _stime;
 414     } _sigchld;
 415
 416     /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
 417     struct
 418     {
 419       unsigned int _addr;
 420     } _sigfault;
 421
 422     /* SIGPOLL */
 423     struct
 424     {
 425       int _band;
 426       int _fd;
 427     } _sigpoll;
 428   } _sifields;
 429 } compat_siginfo_t;
 430
 431 /* For x32, clock_t in _sigchld is 64bit aligned at 4 bytes.  */
 432 typedef struct compat_x32_clock
 433 {
 434   int lower;
 435   int upper;
 436 } compat_x32_clock_t;
 437
 438 typedef struct compat_x32_siginfo
 439 {
 440   int si_signo;
 441   int si_errno;
 442   int si_code;
 443
 444   union
 445   {
 446     int _pad[((128 / sizeof (int)) - 3)];
 447
 448     /* kill() */
 449     struct
 450     {
 451       unsigned int _pid;
 452       unsigned int _uid;
 453     } _kill;
 454
 455     /* POSIX.1b timers */
 456     struct
 457     {
 458       compat_timer_t _tid;
 459       int _overrun;
 460       compat_sigval_t _sigval;
 461     } _timer;
 462
 463     /* POSIX.1b signals */
 464     struct
 465     {
 466       unsigned int _pid;
 467       unsigned int _uid;
 468       compat_sigval_t _sigval;
 469     } _rt;
 470
 471     /* SIGCHLD */
 472     struct
 473     {
 474       unsigned int _pid;
 475       unsigned int _uid;
 476       int _status;
 477       compat_x32_clock_t _utime;
 478       compat_x32_clock_t _stime;
 479     } _sigchld;
 480
 481     /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
 482     struct
 483     {
 484       unsigned int _addr;
 485     } _sigfault;
 486
 487     /* SIGPOLL */
 488     struct
 489     {
 490       int _band;
 491       int _fd;
 492     } _sigpoll;
 493   } _sifields;
 494 } compat_x32_siginfo_t;
 495
 496 #define cpt_si_pid _sifields._kill._pid
 497 #define cpt_si_uid _sifields._kill._uid
 498 #define cpt_si_timerid _sifields._timer._tid
 499 #define cpt_si_overrun _sifields._timer._overrun
 500 #define cpt_si_status _sifields._sigchld._status
 501 #define cpt_si_utime _sifields._sigchld._utime
 502 #define cpt_si_stime _sifields._sigchld._stime
 503 #define cpt_si_ptr _sifields._rt._sigval.sival_ptr
 504 #define cpt_si_addr _sifields._sigfault._addr
 505 #define cpt_si_band _sifields._sigpoll._band
 506 #define cpt_si_fd _sifields._sigpoll._fd
 507
 508 /* glibc at least up to 2.3.2 doesn't have si_timerid, si_overrun.
 509    In their place is si_timer1,si_timer2.  */
 510 #ifndef si_timerid
 511 #define si_timerid si_timer1
 512 #endif
 513 #ifndef si_overrun
 514 #define si_overrun si_timer2
 515 #endif
 516
 517 static void
 518 compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from)
 519 {
 520   memset (to, 0, sizeof (*to));
 521
 522   to->si_signo = from->si_signo;
 523   to->si_errno = from->si_errno;
 524   to->si_code = from->si_code;
 525
 526   if (to->si_code == SI_TIMER)
 527     {
 528       to->cpt_si_timerid = from->si_timerid;
 529       to->cpt_si_overrun = from->si_overrun;
 530       to->cpt_si_ptr = (intptr_t) from->si_ptr;
 531     }
 532   else if (to->si_code == SI_USER)
 533     {
 534       to->cpt_si_pid = from->si_pid;
 535       to->cpt_si_uid = from->si_uid;
 536     }
 537   else if (to->si_code < 0)
 538     {
 539       to->cpt_si_pid = from->si_pid;
 540       to->cpt_si_uid = from->si_uid;
 541       to->cpt_si_ptr = (intptr_t) from->si_ptr;
 542     }
 543   else
 544     {
 545       switch (to->si_signo)
 546         {
 547         case SIGCHLD:
 548           to->cpt_si_pid = from->si_pid;
 549           to->cpt_si_uid = from->si_uid;
 550           to->cpt_si_status = from->si_status;
 551           to->cpt_si_utime = from->si_utime;
 552           to->cpt_si_stime = from->si_stime;
 553           break;
 554         case SIGILL:
 555         case SIGFPE:
 556         case SIGSEGV:
 557         case SIGBUS:
 558           to->cpt_si_addr = (intptr_t) from->si_addr;
 559           break;
 560         case SIGPOLL:
 561           to->cpt_si_band = from->si_band;
 562           to->cpt_si_fd = from->si_fd;
 563           break;
 564         default:
 565           to->cpt_si_pid = from->si_pid;
 566           to->cpt_si_uid = from->si_uid;
 567           to->cpt_si_ptr = (intptr_t) from->si_ptr;
 568           break;
 569         }
 570     }
 571 }
 572
 573 static void
 574 siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from)
 575 {
 576   memset (to, 0, sizeof (*to));
 577
 578   to->si_signo = from->si_signo;
 579   to->si_errno = from->si_errno;
 580   to->si_code = from->si_code;
 581
 582   if (to->si_code == SI_TIMER)
 583     {
 584       to->si_timerid = from->cpt_si_timerid;
 585       to->si_overrun = from->cpt_si_overrun;
 586       to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
 587     }
 588   else if (to->si_code == SI_USER)
 589     {
 590       to->si_pid = from->cpt_si_pid;
 591       to->si_uid = from->cpt_si_uid;
 592     }
 593   if (to->si_code < 0)
 594     {
 595       to->si_pid = from->cpt_si_pid;
 596       to->si_uid = from->cpt_si_uid;
 597       to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
 598     }
 599   else
 600     {
 601       switch (to->si_signo)
 602         {
 603         case SIGCHLD:
 604           to->si_pid = from->cpt_si_pid;
 605           to->si_uid = from->cpt_si_uid;
 606           to->si_status = from->cpt_si_status;
 607           to->si_utime = from->cpt_si_utime;
 608           to->si_stime = from->cpt_si_stime;
 609           break;
 610         case SIGILL:
 611         case SIGFPE:
 612         case SIGSEGV:
 613         case SIGBUS:
 614           to->si_addr = (void *) (intptr_t) from->cpt_si_addr;
 615           break;
 616         case SIGPOLL:
 617           to->si_band = from->cpt_si_band;
 618           to->si_fd = from->cpt_si_fd;
 619           break;
 620         default:
 621           to->si_pid = from->cpt_si_pid;
 622           to->si_uid = from->cpt_si_uid;
 623           to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr;
 624           break;
 625         }
 626     }
 627 }
 628
 629 static void
 630 compat_x32_siginfo_from_siginfo (compat_x32_siginfo_t *to,
 631                                  siginfo_t *from)
 632 {
 633   memset (to, 0, sizeof (*to));
 634
 635   to->si_signo = from->si_signo;
 636   to->si_errno = from->si_errno;
 637   to->si_code = from->si_code;
 638
 639   if (to->si_code == SI_TIMER)
 640     {
 641       to->cpt_si_timerid = from->si_timerid;
 642       to->cpt_si_overrun = from->si_overrun;
 643       to->cpt_si_ptr = (intptr_t) from->si_ptr;
 644     }
 645   else if (to->si_code == SI_USER)
 646     {
 647       to->cpt_si_pid = from->si_pid;
 648       to->cpt_si_uid = from->si_uid;
 649     }
 650   else if (to->si_code < 0)
 651     {
 652       to->cpt_si_pid = from->si_pid;
 653       to->cpt_si_uid = from->si_uid;
 654       to->cpt_si_ptr = (intptr_t) from->si_ptr;
 655     }
 656   else
 657     {
 658       switch (to->si_signo)
 659         {
 660         case SIGCHLD:
 661           to->cpt_si_pid = from->si_pid;
 662           to->cpt_si_uid = from->si_uid;
 663           to->cpt_si_status = from->si_status;
 664           memcpy (&to->cpt_si_utime, &from->si_utime,
 665                   sizeof (to->cpt_si_utime));
 666           memcpy (&to->cpt_si_stime, &from->si_stime,
 667                   sizeof (to->cpt_si_stime));
 668           break;
 669         case SIGILL:
 670         case SIGFPE:
 671         case SIGSEGV:
 672         case SIGBUS:
 673           to->cpt_si_addr = (intptr_t) from->si_addr;
 674           break;
 675         case SIGPOLL:
 676           to->cpt_si_band = from->si_band;
 677           to->cpt_si_fd = from->si_fd;
 678           break;
 679         default:
 680           to->cpt_si_pid = from->si_pid;
 681           to->cpt_si_uid = from->si_uid;
 682           to->cpt_si_ptr = (intptr_t) from->si_ptr;
 683           break;
 684         }
 685     }
 686 }
 687
 688 static void
 689 siginfo_from_compat_x32_siginfo (siginfo_t *to,
 690                                  compat_x32_siginfo_t *from)
 691 {
 692   memset (to, 0, sizeof (*to));
 693
 694   to->si_signo = from->si_signo;
 695   to->si_errno = from->si_errno;
 696   to->si_code = from->si_code;
 697
 698   if (to->si_code == SI_TIMER)
 699     {
 700       to->si_timerid = from->cpt_si_timerid;
 701       to->si_overrun = from->cpt_si_overrun;
 702       to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
 703     }
 704   else if (to->si_code == SI_USER)
 705     {
 706       to->si_pid = from->cpt_si_pid;
 707       to->si_uid = from->cpt_si_uid;
 708     }
 709   if (to->si_code < 0)
 710     {
 711       to->si_pid = from->cpt_si_pid;
 712       to->si_uid = from->cpt_si_uid;
 713       to->si_ptr = (void *) (intptr_t) from->cpt_si_ptr;
 714     }
 715   else
 716     {
 717       switch (to->si_signo)
 718         {
 719         case SIGCHLD:
 720           to->si_pid = from->cpt_si_pid;
 721           to->si_uid = from->cpt_si_uid;
 722           to->si_status = from->cpt_si_status;
 723           memcpy (&to->si_utime, &from->cpt_si_utime,
 724                   sizeof (to->si_utime));
 725           memcpy (&to->si_stime, &from->cpt_si_stime,
 726                   sizeof (to->si_stime));
 727           break;
 728         case SIGILL:
 729         case SIGFPE:
 730         case SIGSEGV:
 731         case SIGBUS:
 732           to->si_addr = (void *) (intptr_t) from->cpt_si_addr;
 733           break;
 734         case SIGPOLL:
 735           to->si_band = from->cpt_si_band;
 736           to->si_fd = from->cpt_si_fd;
 737           break;
 738         default:
 739           to->si_pid = from->cpt_si_pid;
 740           to->si_uid = from->cpt_si_uid;
 741           to->si_ptr = (void* ) (intptr_t) from->cpt_si_ptr;
 742           break;
 743         }
 744     }
 745 }
 746
 747 /* Convert a native/host siginfo object, into/from the siginfo in the
 748    layout of the inferiors' architecture.  Returns true if any
 749    conversion was done; false otherwise.  If DIRECTION is 1, then copy
 750    from INF to NATIVE.  If DIRECTION is 0, copy from NATIVE to
 751    INF.  */
 752
 753 static int
 754 amd64_linux_siginfo_fixup (siginfo_t *native, gdb_byte *inf, int direction)
 755 {
 756   struct gdbarch *gdbarch = get_frame_arch (get_current_frame ());
 757
 758   /* Is the inferior 32-bit?  If so, then do fixup the siginfo
 759      object.  */
 760   if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32)
 761     {
 762       gdb_assert (sizeof (siginfo_t) == sizeof (compat_siginfo_t));
 763
 764       if (direction == 0)
 765         compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, native);
 766       else
 767         siginfo_from_compat_siginfo (native, (struct compat_siginfo *) inf);
 768
 769       return 1;
 770     }
 771   /* No fixup for native x32 GDB.  */
 772   else if (gdbarch_addr_bit (gdbarch) == 32 && sizeof (void *) == 8)
 773     {
 774       gdb_assert (sizeof (siginfo_t) == sizeof (compat_x32_siginfo_t));
 775
 776       if (direction == 0)
 777         compat_x32_siginfo_from_siginfo ((struct compat_x32_siginfo *) inf,
 778                                          native);
 779       else
 780         siginfo_from_compat_x32_siginfo (native,
 781                                          (struct compat_x32_siginfo *) inf);
 782
 783       return 1;
 784     }
 785   else
 786     return 0;
 787 }
 788 \f
 789
 790 /* Provide a prototype to silence -Wmissing-prototypes.  */
 791 void _initialize_amd64_linux_nat (void);
 792
 793 void
 794 _initialize_amd64_linux_nat (void)
 795 {
 796   struct target_ops *t;
 797
 798   amd64_native_gregset32_reg_offset = amd64_linux_gregset32_reg_offset;
 799   amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS;
 800   amd64_native_gregset64_reg_offset = amd64_linux_gregset_reg_offset;
 801   amd64_native_gregset64_num_regs = AMD64_LINUX_NUM_REGS;
 802
 803   gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset)
 804               == amd64_native_gregset32_num_regs);
 805
 806   /* Create a generic x86 GNU/Linux target.  */
 807   t = x86_linux_create_target ();
 808
 809   /* Add our register access methods.  */
 810   t->to_fetch_registers = amd64_linux_fetch_inferior_registers;
 811   t->to_store_registers = amd64_linux_store_inferior_registers;
 812
 813   /* Add the target.  */
 814   x86_linux_add_target (t);
 815
 816   /* Add our siginfo layout converter.  */
 817   linux_nat_set_siginfo_fixup (t, amd64_linux_siginfo_fixup);
 818 }