coregrind/m_gdbserver/valgrind-low-amd64.c

   1 /* Low level interface to valgrind, for the remote server for GDB integrated
   2    in valgrind.
   3    Copyright (C) 2011
   4    Free Software Foundation, Inc.
   5
   6    This file is part of VALGRIND.
   7    It has been inspired from a file from gdbserver in gdb 6.6.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22    Boston, MA 02110-1301, USA.  */
  23
  24 #include "server.h"
  25 #include "target.h"
  26 #include "regdef.h"
  27 #include "regcache.h"
  28
  29 #include "pub_core_machine.h"
  30 #include "pub_core_threadstate.h"
  31 #include "pub_core_transtab.h"
  32 #include "pub_core_gdbserver.h"
  33
  34 #include "valgrind_low.h"
  35
  36 #include "libvex_guest_amd64.h"
  37 /* GDBTD: ??? have a cleaner way to get the f80 <> f64 conversion functions */
  38 /* below include needed for conversion f80 <> f64 */
  39 #include "../../VEX/priv/guest_generic_x87.h"
  40
  41 /* below loosely inspired from file generated with gdb regdat.sh */
  42
  43 static struct reg regs[] = {
  44   { "rax", 0, 64 },
  45   { "rbx", 64, 64 },
  46   { "rcx", 128, 64 },
  47   { "rdx", 192, 64 },
  48   { "rsi", 256, 64 },
  49   { "rdi", 320, 64 },
  50   { "rbp", 384, 64 },
  51   { "rsp", 448, 64 },
  52   { "r8", 512, 64 },
  53   { "r9", 576, 64 },
  54   { "r10", 640, 64 },
  55   { "r11", 704, 64 },
  56   { "r12", 768, 64 },
  57   { "r13", 832, 64 },
  58   { "r14", 896, 64 },
  59   { "r15", 960, 64 },
  60   { "rip", 1024, 64 },
  61   { "eflags", 1088, 32 },
  62   { "cs", 1120, 32 },
  63   { "ss", 1152, 32 },
  64   { "ds", 1184, 32 },
  65   { "es", 1216, 32 },
  66   { "fs", 1248, 32 },
  67   { "gs", 1280, 32 },
  68   { "st0", 1312, 80 },
  69   { "st1", 1392, 80 },
  70   { "st2", 1472, 80 },
  71   { "st3", 1552, 80 },
  72   { "st4", 1632, 80 },
  73   { "st5", 1712, 80 },
  74   { "st6", 1792, 80 },
  75   { "st7", 1872, 80 },
  76   { "fctrl", 1952, 32 },
  77   { "fstat", 1984, 32 },
  78   { "ftag", 2016, 32 },
  79   { "fiseg", 2048, 32 },
  80   { "fioff", 2080, 32 },
  81   { "foseg", 2112, 32 },
  82   { "fooff", 2144, 32 },
  83   { "fop", 2176, 32 },
  84   { "xmm0", 2208, 128 },
  85   { "xmm1", 2336, 128 },
  86   { "xmm2", 2464, 128 },
  87   { "xmm3", 2592, 128 },
  88   { "xmm4", 2720, 128 },
  89   { "xmm5", 2848, 128 },
  90   { "xmm6", 2976, 128 },
  91   { "xmm7", 3104, 128 },
  92   { "xmm8", 3232, 128 },
  93   { "xmm9", 3360, 128 },
  94   { "xmm10", 3488, 128 },
  95   { "xmm11", 3616, 128 },
  96   { "xmm12", 3744, 128 },
  97   { "xmm13", 3872, 128 },
  98   { "xmm14", 4000, 128 },
  99   { "xmm15", 4128, 128 },
 100   { "mxcsr", 4256, 32  },
 101 #if defined(VGO_linux)
 102   { "orig_rax", 4288, 64 },
 103 #endif
 104   { "ymm0h", 4352, 128 }, // The ymm?h registers only to be given to GDB
 105   { "ymm1h", 4480, 128 }, // if Valgrind is running with AVX instructions.
 106   { "ymm2h", 4608, 128 },
 107   { "ymm3h", 4736, 128 },
 108   { "ymm4h", 4864, 128 },
 109   { "ymm5h", 4992, 128 },
 110   { "ymm6h", 5120, 128 },
 111   { "ymm7h", 5248, 128 },
 112   { "ymm8h", 5376, 128 },
 113   { "ymm9h", 5504, 128 },
 114   { "ymm10h", 5632, 128 },
 115   { "ymm11h", 5760, 128 },
 116   { "ymm12h", 5888, 128 },
 117   { "ymm13h", 6016, 128 },
 118   { "ymm14h", 6144, 128 },
 119   { "ymm15h", 6272, 128 }
 120 };
 121 static const char *expedite_regs[] = { "rbp", "rsp", "rip", 0 };
 122 #define max_num_regs (sizeof (regs) / sizeof (regs[0]))
 123 static int dyn_num_regs; // if no AVX, we have to give less registers to gdb.
 124
 125
 126 static
 127 CORE_ADDR get_pc (void)
 128 {
 129    unsigned long pc;
 130
 131    collect_register_by_name ("rip", &pc);
 132
 133    dlog(1, "stop pc is %p\n", (void *) pc);
 134    return pc;
 135 }
 136
 137 static
 138 void set_pc (CORE_ADDR newpc)
 139 {
 140    Bool mod;
 141    supply_register_by_name ("rip", &newpc, &mod);
 142    if (mod)
 143       dlog(1, "set pc to %p\n", C2v (newpc));
 144    else
 145       dlog(1, "set pc not changed %p\n", C2v (newpc));
 146 }
 147
 148 /* store registers in the guest state (gdbserver_to_valgrind)
 149    or fetch register from the guest state (valgrind_to_gdbserver). */
 150 static
 151 void transfer_register (ThreadId tid, int abs_regno, void * buf,
 152                         transfer_direction dir, int size, Bool *mod)
 153 {
 154    ThreadState* tst = VG_(get_ThreadState)(tid);
 155    int set = abs_regno / dyn_num_regs;
 156    int regno = abs_regno % dyn_num_regs;
 157    *mod = False;
 158
 159    VexGuestAMD64State* amd64 = (VexGuestAMD64State*) get_arch (set, tst);
 160
 161    switch (regno) {
 162    // numbers here have to match the order of regs above.
 163    // Attention: gdb order does not match valgrind order.
 164    case 0:  VG_(transfer) (&amd64->guest_RAX, buf, dir, size, mod); break;
 165    case 1:  VG_(transfer) (&amd64->guest_RBX, buf, dir, size, mod); break;
 166    case 2:  VG_(transfer) (&amd64->guest_RCX, buf, dir, size, mod); break;
 167    case 3:  VG_(transfer) (&amd64->guest_RDX, buf, dir, size, mod); break;
 168    case 4:  VG_(transfer) (&amd64->guest_RSI, buf, dir, size, mod); break;
 169    case 5:  VG_(transfer) (&amd64->guest_RDI, buf, dir, size, mod); break;
 170    case 6:  VG_(transfer) (&amd64->guest_RBP, buf, dir, size, mod); break;
 171    case 7:  VG_(transfer) (&amd64->guest_RSP, buf, dir, size, mod); break;
 172    case 8:  VG_(transfer) (&amd64->guest_R8,  buf, dir, size, mod); break;
 173    case 9:  VG_(transfer) (&amd64->guest_R9,  buf, dir, size, mod); break;
 174    case 10: VG_(transfer) (&amd64->guest_R10, buf, dir, size, mod); break;
 175    case 11: VG_(transfer) (&amd64->guest_R11, buf, dir, size, mod); break;
 176    case 12: VG_(transfer) (&amd64->guest_R12, buf, dir, size, mod); break;
 177    case 13: VG_(transfer) (&amd64->guest_R13, buf, dir, size, mod); break;
 178    case 14: VG_(transfer) (&amd64->guest_R14, buf, dir, size, mod); break;
 179    case 15: VG_(transfer) (&amd64->guest_R15, buf, dir, size, mod); break;
 180    case 16: VG_(transfer) (&amd64->guest_RIP, buf, dir, size, mod); break;
 181    case 17:
 182       if (dir == valgrind_to_gdbserver) {
 183          ULong rflags;
 184          /* we can only retrieve the real flags (set 0)
 185             retrieving shadow flags is not ok */
 186          if (set == 0)
 187             rflags = LibVEX_GuestAMD64_get_rflags (amd64);
 188          else
 189             rflags = 0;
 190          VG_(transfer) (&rflags, buf, dir, size, mod);
 191       } else {
 192          *mod = False; //GDBTD? how do we store rflags in libvex_guest_amd64.h ???
 193       }
 194       break;
 195    case 18: *mod = False; break; //GDBTD VG_(transfer) (&amd64->guest_CS, buf, dir, size, mod);
 196    case 19: *mod = False; break; //GDBTD VG_(transfer) (&amd64->guest_SS, buf, dir, size, mod);
 197    case 20: *mod = False; break; //GDBTD VG_(transfer) (&amd64->guest_DS, buf, dir, size, mod);
 198    case 21: *mod = False; break; //GDBTD VG_(transfer) (&amd64->guest_ES, buf, dir, size, mod);
 199    case 22: *mod = False; break; //GDBTD VG_(transfer) (&amd64->guest_FS, buf, dir, size, mod);
 200    case 23: VG_(transfer) (&amd64->guest_GS_CONST, buf, dir, size, mod); break;
 201    case 24:
 202    case 25:
 203    case 26:
 204    case 27: /* register 24 to 31 are float registers 80 bits but 64 bits in valgrind */
 205    case 28:
 206    case 29:
 207    case 30:
 208    case 31:
 209       if (dir == valgrind_to_gdbserver) {
 210          UChar fpreg80[10];
 211          convert_f64le_to_f80le ((UChar *)&amd64->guest_FPREG[regno-24],
 212                                  fpreg80);
 213          VG_(transfer) (&fpreg80, buf, dir, sizeof(fpreg80), mod);
 214       } else {
 215          ULong fpreg64;
 216          convert_f80le_to_f64le (buf, (UChar *)&fpreg64);
 217          VG_(transfer) (&amd64->guest_FPREG[regno-24], &fpreg64,
 218                         dir, sizeof(fpreg64), mod);
 219       }
 220       break;
 221    case 32:
 222       if (dir == valgrind_to_gdbserver) {
 223          // vex only models the rounding bits (see libvex_guest_amd64.h)
 224          UWord value = 0x037f;
 225          value |= amd64->guest_FPROUND << 10;
 226          VG_(transfer)(&value, buf, dir, size, mod);
 227       } else {
 228          *mod = False; // GDBTD???? VEX equivalent fcrtl
 229       }
 230       break;
 231    case 33:
 232       if (dir == valgrind_to_gdbserver) {
 233          UWord value = amd64->guest_FC3210;
 234          value |= (amd64->guest_FTOP & 7) << 11;
 235          VG_(transfer)(&value, buf, dir, size, mod);
 236       } else {
 237          *mod = False; // GDBTD???? VEX equivalent fstat
 238       }
 239       break;
 240    case 34:
 241       if (dir == valgrind_to_gdbserver) {
 242          // vex doesn't model these precisely
 243          UWord value =
 244             ((amd64->guest_FPTAG[0] ? 0 : 3) << 0)  |
 245             ((amd64->guest_FPTAG[1] ? 0 : 3) << 2)  |
 246             ((amd64->guest_FPTAG[2] ? 0 : 3) << 4)  |
 247             ((amd64->guest_FPTAG[3] ? 0 : 3) << 6)  |
 248             ((amd64->guest_FPTAG[4] ? 0 : 3) << 8)  |
 249             ((amd64->guest_FPTAG[5] ? 0 : 3) << 10) |
 250             ((amd64->guest_FPTAG[6] ? 0 : 3) << 12) |
 251             ((amd64->guest_FPTAG[7] ? 0 : 3) << 14);
 252          VG_(transfer)(&value, buf, dir, size, mod);
 253       } else {
 254          *mod = False; // GDBTD???? VEX equivalent ftag
 255       }
 256       break;
 257    case 35: *mod = False; break; // GDBTD ??? equivalent of fiseg
 258    case 36: *mod = False; break; // GDBTD ??? equivalent of fioff
 259    case 37: *mod = False; break; // GDBTD ??? equivalent of foseg
 260    case 38: *mod = False; break; // GDBTD ??? equivalent of fooff
 261    case 39: *mod = False; break; // GDBTD ??? equivalent of fop
 262    case 40: VG_(transfer) (&amd64->guest_YMM0[0],  buf, dir, size, mod); break;
 263    case 41: VG_(transfer) (&amd64->guest_YMM1[0],  buf, dir, size, mod); break;
 264    case 42: VG_(transfer) (&amd64->guest_YMM2[0],  buf, dir, size, mod); break;
 265    case 43: VG_(transfer) (&amd64->guest_YMM3[0],  buf, dir, size, mod); break;
 266    case 44: VG_(transfer) (&amd64->guest_YMM4[0],  buf, dir, size, mod); break;
 267    case 45: VG_(transfer) (&amd64->guest_YMM5[0],  buf, dir, size, mod); break;
 268    case 46: VG_(transfer) (&amd64->guest_YMM6[0],  buf, dir, size, mod); break;
 269    case 47: VG_(transfer) (&amd64->guest_YMM7[0],  buf, dir, size, mod); break;
 270    case 48: VG_(transfer) (&amd64->guest_YMM8[0],  buf, dir, size, mod); break;
 271    case 49: VG_(transfer) (&amd64->guest_YMM9[0],  buf, dir, size, mod); break;
 272    case 50: VG_(transfer) (&amd64->guest_YMM10[0], buf, dir, size, mod); break;
 273    case 51: VG_(transfer) (&amd64->guest_YMM11[0], buf, dir, size, mod); break;
 274    case 52: VG_(transfer) (&amd64->guest_YMM12[0], buf, dir, size, mod); break;
 275    case 53: VG_(transfer) (&amd64->guest_YMM13[0], buf, dir, size, mod); break;
 276    case 54: VG_(transfer) (&amd64->guest_YMM14[0], buf, dir, size, mod); break;
 277    case 55: VG_(transfer) (&amd64->guest_YMM15[0], buf, dir, size, mod); break;
 278    case 56:
 279       if (dir == valgrind_to_gdbserver) {
 280          // vex only models the rounding bits (see libvex_guest_x86.h)
 281          UWord value = 0x1f80;
 282          value |= amd64->guest_SSEROUND << 13;
 283          VG_(transfer)(&value, buf, dir, size, mod);
 284       } else {
 285          *mod = False;  // GDBTD???? VEX equivalent mxcsr
 286       }
 287       break;
 288    case 57: *mod = False; break; // GDBTD???? VEX equivalent { "orig_rax"},
 289    case 58: VG_(transfer) (&amd64->guest_YMM0[4],  buf, dir, size, mod); break;
 290    case 59: VG_(transfer) (&amd64->guest_YMM1[4],  buf, dir, size, mod); break;
 291    case 60: VG_(transfer) (&amd64->guest_YMM2[4],  buf, dir, size, mod); break;
 292    case 61: VG_(transfer) (&amd64->guest_YMM3[4],  buf, dir, size, mod); break;
 293    case 62: VG_(transfer) (&amd64->guest_YMM4[4],  buf, dir, size, mod); break;
 294    case 63: VG_(transfer) (&amd64->guest_YMM5[4],  buf, dir, size, mod); break;
 295    case 64: VG_(transfer) (&amd64->guest_YMM6[4],  buf, dir, size, mod); break;
 296    case 65: VG_(transfer) (&amd64->guest_YMM7[4],  buf, dir, size, mod); break;
 297    case 66: VG_(transfer) (&amd64->guest_YMM8[4],  buf, dir, size, mod); break;
 298    case 67: VG_(transfer) (&amd64->guest_YMM9[4],  buf, dir, size, mod); break;
 299    case 68: VG_(transfer) (&amd64->guest_YMM10[4], buf, dir, size, mod); break;
 300    case 69: VG_(transfer) (&amd64->guest_YMM11[4], buf, dir, size, mod); break;
 301    case 70: VG_(transfer) (&amd64->guest_YMM12[4], buf, dir, size, mod); break;
 302    case 71: VG_(transfer) (&amd64->guest_YMM13[4], buf, dir, size, mod); break;
 303    case 72: VG_(transfer) (&amd64->guest_YMM14[4], buf, dir, size, mod); break;
 304    case 73: VG_(transfer) (&amd64->guest_YMM15[4], buf, dir, size, mod); break;
 305    default: vg_assert(0);
 306    }
 307 }
 308
 309 static
 310 Bool have_avx(void)
 311 {
 312    VexArch va;
 313    VexArchInfo vai;
 314    VG_(machine_get_VexArchInfo) (&va, &vai);
 315    return (vai.hwcaps & VEX_HWCAPS_AMD64_AVX ? True : False);
 316 }
 317
 318 static
 319 const char* target_xml (Bool shadow_mode)
 320 {
 321    if (shadow_mode) {
 322 #if defined(VGO_linux)
 323       if (have_avx())
 324          return "amd64-avx-linux-valgrind.xml";
 325       else
 326          return "amd64-linux-valgrind.xml";
 327 #else
 328       if (have_avx())
 329          return "amd64-avx-coresse-valgrind.xml";
 330       else
 331          return "amd64-coresse-valgrind.xml";
 332 #endif
 333    } else {
 334 #if defined(VGO_linux)
 335       if (have_avx())
 336          return "amd64-avx-linux.xml";
 337       else
 338          return NULL;
 339 #else
 340       if (have_avx())
 341          return "amd64-avx-coresse.xml";
 342       else
 343          return NULL;
 344 #endif
 345    }
 346 }
 347
 348 static CORE_ADDR** target_get_dtv (ThreadState *tst)
 349 {
 350    VexGuestAMD64State* amd64 = (VexGuestAMD64State*)&tst->arch.vex;
 351    return (CORE_ADDR**)((CORE_ADDR)amd64->guest_FS_CONST + 0x8);
 352 }
 353
 354 static struct valgrind_target_ops low_target = {
 355    -1, // Must be computed at init time.
 356    regs,
 357    7, //RSP
 358    transfer_register,
 359    get_pc,
 360    set_pc,
 361    "amd64",
 362    target_xml,
 363    target_get_dtv
 364 };
 365
 366 void amd64_init_architecture (struct valgrind_target_ops *target)
 367 {
 368    *target = low_target;
 369    if (have_avx())
 370       dyn_num_regs = max_num_regs;
 371    else
 372       dyn_num_regs = max_num_regs - 16; // remove the AVX "high" registers.
 373    target->num_regs = dyn_num_regs;
 374    set_register_cache (regs, dyn_num_regs);
 375    gdbserver_expedite_regs = expedite_regs;
 376 }