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_aspacemgr.h" 30 #include "pub_tool_machine.h" 31 #include "pub_core_threadstate.h" 32 #include "pub_core_transtab.h" 33 #include "pub_core_gdbserver.h" 34 35 #include "valgrind_low.h" 36 37 #include "libvex_guest_x86.h" 38 /* GDBTD: ??? have a cleaner way to get the f80 <> f64 conversion functions */ 39 /* below include needed for conversion f80 <> f64 */ 40 #include "../../VEX/priv/guest_generic_x87.h" 41 42 43 /* below loosely inspired from file generated with gdb regdat.sh */ 44 45 static struct reg regs[] = { 46 { "eax", 0, 32 }, 47 { "ecx", 32, 32 }, 48 { "edx", 64, 32 }, 49 { "ebx", 96, 32 }, 50 { "esp", 128, 32 }, 51 { "ebp", 160, 32 }, 52 { "esi", 192, 32 }, 53 { "edi", 224, 32 }, 54 { "eip", 256, 32 }, 55 { "eflags", 288, 32 }, 56 { "cs", 320, 32 }, 57 { "ss", 352, 32 }, 58 { "ds", 384, 32 }, 59 { "es", 416, 32 }, 60 { "fs", 448, 32 }, 61 { "gs", 480, 32 }, 62 { "st0", 512, 80 }, 63 { "st1", 592, 80 }, 64 { "st2", 672, 80 }, 65 { "st3", 752, 80 }, 66 { "st4", 832, 80 }, 67 { "st5", 912, 80 }, 68 { "st6", 992, 80 }, 69 { "st7", 1072, 80 }, 70 { "fctrl", 1152, 32 }, 71 { "fstat", 1184, 32 }, 72 { "ftag", 1216, 32 }, 73 { "fiseg", 1248, 32 }, 74 { "fioff", 1280, 32 }, 75 { "foseg", 1312, 32 }, 76 { "fooff", 1344, 32 }, 77 { "fop", 1376, 32 }, 78 { "xmm0", 1408, 128 }, 79 { "xmm1", 1536, 128 }, 80 { "xmm2", 1664, 128 }, 81 { "xmm3", 1792, 128 }, 82 { "xmm4", 1920, 128 }, 83 { "xmm5", 2048, 128 }, 84 { "xmm6", 2176, 128 }, 85 { "xmm7", 2304, 128 }, 86 { "mxcsr", 2432, 32 }, 87 #if defined(VGO_linux) 88 { "orig_eax", 2464, 32 } 89 #endif 90 }; 91 static const char *expedite_regs[] = { "ebp", "esp", "eip", 0 }; 92 #define num_regs (sizeof (regs) / sizeof (regs[0])) 93 94 static 95 CORE_ADDR get_pc (void) 96 { 97 unsigned long pc; 98 99 collect_register_by_name ("eip", &pc); 100 101 dlog(1, "stop pc is %p\n", (void *) pc); 102 return pc; 103 } 104 105 static 106 void set_pc (CORE_ADDR newpc) 107 { 108 Bool mod; 109 supply_register_by_name ("eip", &newpc, &mod); 110 if (mod) 111 dlog(1, "set pc to %p\n", C2v (newpc)); 112 else 113 dlog(1, "set pc not changed %p\n", C2v (newpc)); 114 } 115 116 /* store registers in the guest state (gdbserver_to_valgrind) 117 or fetch register from the guest state (valgrind_to_gdbserver). */ 118 static 119 void transfer_register (ThreadId tid, int abs_regno, void * buf, 120 transfer_direction dir, int size, Bool *mod) 121 { 122 ThreadState* tst = VG_(get_ThreadState)(tid); 123 int set = abs_regno / num_regs; 124 int regno = abs_regno % num_regs; 125 *mod = False; 126 127 VexGuestX86State* x86 = (VexGuestX86State*) get_arch (set, tst); 128 129 switch (regno) { 130 // numbers here have to match the order of regs above 131 // Attention: gdb order does not match valgrind order. 132 case 0: VG_(transfer) (&x86->guest_EAX, buf, dir, size, mod); break; 133 case 1: VG_(transfer) (&x86->guest_ECX, buf, dir, size, mod); break; 134 case 2: VG_(transfer) (&x86->guest_EDX, buf, dir, size, mod); break; 135 case 3: VG_(transfer) (&x86->guest_EBX, buf, dir, size, mod); break; 136 case 4: VG_(transfer) (&x86->guest_ESP, buf, dir, size, mod); break; 137 case 5: VG_(transfer) (&x86->guest_EBP, buf, dir, size, mod); break; 138 case 6: VG_(transfer) (&x86->guest_ESI, buf, dir, size, mod); break; 139 case 7: VG_(transfer) (&x86->guest_EDI, buf, dir, size, mod); break; 140 case 8: 141 VG_(transfer) (&x86->guest_EIP, buf, dir, size, mod); 142 if (*mod && VG_(debugLog_getLevel)() > 2) { 143 char bufimage [2*sizeof(x86->guest_IP_AT_SYSCALL) + 1]; 144 heximage (bufimage, 145 (char *) &x86->guest_IP_AT_SYSCALL, 146 sizeof(x86->guest_IP_AT_SYSCALL)); 147 dlog(3, "guest_IP_AT_SYSCALL %s\n", bufimage); 148 } 149 break; 150 case 9: 151 if (dir == valgrind_to_gdbserver) { 152 UInt eflags; 153 /* we can only retrieve the real flags (set 0) 154 retrieving shadow flags is not ok */ 155 if (set == 0) 156 eflags = LibVEX_GuestX86_get_eflags (x86); 157 else 158 eflags = 0; 159 VG_(transfer) (&eflags, buf, dir, size, mod); break; 160 } else { 161 *mod = False; //GDBTD? how do we store eflags in libvex_guest_x86.h ??? 162 } 163 break; 164 case 10: VG_(transfer) (&x86->guest_CS, buf, dir, size, mod); break; 165 case 11: VG_(transfer) (&x86->guest_SS, buf, dir, size, mod); break; 166 case 12: VG_(transfer) (&x86->guest_DS, buf, dir, size, mod); break; 167 case 13: VG_(transfer) (&x86->guest_ES, buf, dir, size, mod); break; 168 case 14: VG_(transfer) (&x86->guest_FS, buf, dir, size, mod); break; 169 case 15: VG_(transfer) (&x86->guest_GS, buf, dir, size, mod); break; 170 case 16: 171 case 17: 172 case 18: 173 case 19: /* register 16 to 23 are float registers 80 bits but 64 bits in valgrind */ 174 case 20: 175 case 21: 176 case 22: 177 case 23: { 178 if (dir == valgrind_to_gdbserver) { 179 UChar fpreg80[10]; 180 convert_f64le_to_f80le ((UChar *)&x86->guest_FPREG[regno-16], 181 fpreg80); 182 VG_(transfer) (&fpreg80, buf, dir, sizeof(fpreg80), mod); 183 } else { 184 ULong fpreg64; 185 convert_f80le_to_f64le (buf, (UChar *)&fpreg64); 186 VG_(transfer) (&x86->guest_FPREG[regno-16], &fpreg64, 187 dir, sizeof(fpreg64), mod); 188 } 189 break; 190 } 191 case 24: 192 if (dir == valgrind_to_gdbserver) { 193 // vex only models the rounding bits (see libvex_guest_x86.h) 194 UWord value = 0x037f; 195 value |= x86->guest_FPROUND << 10; 196 VG_(transfer)(&value, buf, dir, size, mod); 197 } else { 198 *mod = False; // GDBTD???? VEX { "fctrl", 1152, 32 }, 199 } 200 break; 201 case 25: 202 if (dir == valgrind_to_gdbserver) { 203 UWord value = x86->guest_FC3210; 204 value |= (x86->guest_FTOP & 7) << 11; 205 VG_(transfer)(&value, buf, dir, size, mod); 206 } else { 207 *mod = False; // GDBTD???? VEX { "fstat", 1184, 32 }, 208 } 209 break; 210 case 26: 211 if (dir == valgrind_to_gdbserver) { 212 // vex doesn't model these precisely 213 UWord value = 214 ((x86->guest_FPTAG[0] ? 0 : 3) << 0) | 215 ((x86->guest_FPTAG[1] ? 0 : 3) << 2) | 216 ((x86->guest_FPTAG[2] ? 0 : 3) << 4) | 217 ((x86->guest_FPTAG[3] ? 0 : 3) << 6) | 218 ((x86->guest_FPTAG[4] ? 0 : 3) << 8) | 219 ((x86->guest_FPTAG[5] ? 0 : 3) << 10) | 220 ((x86->guest_FPTAG[6] ? 0 : 3) << 12) | 221 ((x86->guest_FPTAG[7] ? 0 : 3) << 14); 222 VG_(transfer)(&value, buf, dir, size, mod); 223 } else { 224 *mod = False; // GDBTD???? VEX { "ftag", 1216, 32 }, 225 } 226 break; 227 case 27: *mod = False; break; // GDBTD???? VEX { "fiseg", 1248, 32 }, 228 case 28: *mod = False; break; // GDBTD???? VEX { "fioff", 1280, 32 }, 229 case 29: *mod = False; break; // GDBTD???? VEX { "foseg", 1312, 32 }, 230 case 30: *mod = False; break; // GDBTD???? VEX { "fooff", 1344, 32 }, 231 case 31: *mod = False; break; // GDBTD???? VEX { "fop", 1376, 32 }, 232 case 32: VG_(transfer) (&x86->guest_XMM0, buf, dir, size, mod); break; 233 case 33: VG_(transfer) (&x86->guest_XMM1, buf, dir, size, mod); break; 234 case 34: VG_(transfer) (&x86->guest_XMM2, buf, dir, size, mod); break; 235 case 35: VG_(transfer) (&x86->guest_XMM3, buf, dir, size, mod); break; 236 case 36: VG_(transfer) (&x86->guest_XMM4, buf, dir, size, mod); break; 237 case 37: VG_(transfer) (&x86->guest_XMM5, buf, dir, size, mod); break; 238 case 38: VG_(transfer) (&x86->guest_XMM6, buf, dir, size, mod); break; 239 case 39: VG_(transfer) (&x86->guest_XMM7, buf, dir, size, mod); break; 240 case 40: 241 if (dir == valgrind_to_gdbserver) { 242 // vex only models the rounding bits (see libvex_guest_x86.h) 243 UWord value = 0x1f80; 244 value |= x86->guest_SSEROUND << 13; 245 VG_(transfer)(&value, buf, dir, size, mod); 246 } else { 247 *mod = False; // GDBTD???? VEX { "mxcsr", 2432, 32 }, 248 } 249 break; 250 case 41: *mod = False; break; // GDBTD???? VEX { "orig_eax", 2464, 32 }, 251 default: vg_assert(0); 252 } 253 } 254 255 static struct valgrind_target_ops low_target = { 256 num_regs, 257 regs, 258 4, //ESP 259 transfer_register, 260 get_pc, 261 set_pc, 262 "i386", 263 NULL, // target_xml not needed. 264 #if defined(VGO_linux) 265 "i386-linux-valgrind.xml" 266 #else 267 "i386-coresse-valgrind.xml" 268 #endif 269 }; 270 271 void x86_init_architecture (struct valgrind_target_ops *target) 272 { 273 *target = low_target; 274 set_register_cache (regs, num_regs); 275 gdbserver_expedite_regs = expedite_regs; 276 } 277
