| /* Low level interface to valgrind, for the remote server for GDB integrated |
| in valgrind. |
| Copyright (C) 2011 |
| Free Software Foundation, Inc. |
| |
| This file is part of VALGRIND. |
| It has been inspired from a file from gdbserver in gdb 6.6. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| Boston, MA 02110-1301, USA. */ |
| |
| #include "server.h" |
| #include "target.h" |
| #include "regdef.h" |
| #include "regcache.h" |
| |
| #include "pub_core_machine.h" |
| #include "pub_core_threadstate.h" |
| #include "pub_core_transtab.h" |
| #include "pub_core_gdbserver.h" |
| |
| #include "valgrind_low.h" |
| |
| #include "libvex_guest_x86.h" |
| /* GDBTD: ??? have a cleaner way to get the f80 <> f64 conversion functions */ |
| /* below include needed for conversion f80 <> f64 */ |
| #include "../../VEX/priv/guest_generic_x87.h" |
| |
| |
| /* below loosely inspired from file generated with gdb regdat.sh */ |
| |
| static struct reg regs[] = { |
| { "eax", 0, 32 }, |
| { "ecx", 32, 32 }, |
| { "edx", 64, 32 }, |
| { "ebx", 96, 32 }, |
| { "esp", 128, 32 }, |
| { "ebp", 160, 32 }, |
| { "esi", 192, 32 }, |
| { "edi", 224, 32 }, |
| { "eip", 256, 32 }, |
| { "eflags", 288, 32 }, |
| { "cs", 320, 32 }, |
| { "ss", 352, 32 }, |
| { "ds", 384, 32 }, |
| { "es", 416, 32 }, |
| { "fs", 448, 32 }, |
| { "gs", 480, 32 }, |
| { "st0", 512, 80 }, |
| { "st1", 592, 80 }, |
| { "st2", 672, 80 }, |
| { "st3", 752, 80 }, |
| { "st4", 832, 80 }, |
| { "st5", 912, 80 }, |
| { "st6", 992, 80 }, |
| { "st7", 1072, 80 }, |
| { "fctrl", 1152, 32 }, |
| { "fstat", 1184, 32 }, |
| { "ftag", 1216, 32 }, |
| { "fiseg", 1248, 32 }, |
| { "fioff", 1280, 32 }, |
| { "foseg", 1312, 32 }, |
| { "fooff", 1344, 32 }, |
| { "fop", 1376, 32 }, |
| { "xmm0", 1408, 128 }, |
| { "xmm1", 1536, 128 }, |
| { "xmm2", 1664, 128 }, |
| { "xmm3", 1792, 128 }, |
| { "xmm4", 1920, 128 }, |
| { "xmm5", 2048, 128 }, |
| { "xmm6", 2176, 128 }, |
| { "xmm7", 2304, 128 }, |
| { "mxcsr", 2432, 32 }, |
| #if defined(VGO_linux) |
| { "orig_eax", 2464, 32 } |
| #endif |
| }; |
| static const char *expedite_regs[] = { "ebp", "esp", "eip", 0 }; |
| #define num_regs (sizeof (regs) / sizeof (regs[0])) |
| |
| static |
| CORE_ADDR get_pc (void) |
| { |
| unsigned long pc; |
| |
| collect_register_by_name ("eip", &pc); |
| |
| dlog(1, "stop pc is %p\n", (void *) pc); |
| return pc; |
| } |
| |
| static |
| void set_pc (CORE_ADDR newpc) |
| { |
| Bool mod; |
| supply_register_by_name ("eip", &newpc, &mod); |
| if (mod) |
| dlog(1, "set pc to %p\n", C2v (newpc)); |
| else |
| dlog(1, "set pc not changed %p\n", C2v (newpc)); |
| } |
| |
| /* store registers in the guest state (gdbserver_to_valgrind) |
| or fetch register from the guest state (valgrind_to_gdbserver). */ |
| static |
| void transfer_register (ThreadId tid, int abs_regno, void * buf, |
| transfer_direction dir, int size, Bool *mod) |
| { |
| ThreadState* tst = VG_(get_ThreadState)(tid); |
| int set = abs_regno / num_regs; |
| int regno = abs_regno % num_regs; |
| *mod = False; |
| |
| VexGuestX86State* x86 = (VexGuestX86State*) get_arch (set, tst); |
| |
| switch (regno) { |
| // numbers here have to match the order of regs above |
| // Attention: gdb order does not match valgrind order. |
| case 0: VG_(transfer) (&x86->guest_EAX, buf, dir, size, mod); break; |
| case 1: VG_(transfer) (&x86->guest_ECX, buf, dir, size, mod); break; |
| case 2: VG_(transfer) (&x86->guest_EDX, buf, dir, size, mod); break; |
| case 3: VG_(transfer) (&x86->guest_EBX, buf, dir, size, mod); break; |
| case 4: VG_(transfer) (&x86->guest_ESP, buf, dir, size, mod); break; |
| case 5: VG_(transfer) (&x86->guest_EBP, buf, dir, size, mod); break; |
| case 6: VG_(transfer) (&x86->guest_ESI, buf, dir, size, mod); break; |
| case 7: VG_(transfer) (&x86->guest_EDI, buf, dir, size, mod); break; |
| case 8: VG_(transfer) (&x86->guest_EIP, buf, dir, size, mod); break; |
| case 9: |
| if (dir == valgrind_to_gdbserver) { |
| UInt eflags; |
| /* we can only retrieve the real flags (set 0) |
| retrieving shadow flags is not ok */ |
| if (set == 0) |
| eflags = LibVEX_GuestX86_get_eflags (x86); |
| else |
| eflags = 0; |
| VG_(transfer) (&eflags, buf, dir, size, mod); break; |
| } else { |
| *mod = False; //GDBTD? how do we store eflags in libvex_guest_x86.h ??? |
| } |
| break; |
| case 10: VG_(transfer) (&x86->guest_CS, buf, dir, size, mod); break; |
| case 11: VG_(transfer) (&x86->guest_SS, buf, dir, size, mod); break; |
| case 12: VG_(transfer) (&x86->guest_DS, buf, dir, size, mod); break; |
| case 13: VG_(transfer) (&x86->guest_ES, buf, dir, size, mod); break; |
| case 14: VG_(transfer) (&x86->guest_FS, buf, dir, size, mod); break; |
| case 15: VG_(transfer) (&x86->guest_GS, buf, dir, size, mod); break; |
| case 16: |
| case 17: |
| case 18: |
| case 19: /* register 16 to 23 are float registers 80 bits but 64 bits in valgrind */ |
| case 20: |
| case 21: |
| case 22: |
| case 23: { |
| if (dir == valgrind_to_gdbserver) { |
| UChar fpreg80[10]; |
| convert_f64le_to_f80le ((UChar *)&x86->guest_FPREG[regno-16], |
| fpreg80); |
| VG_(transfer) (&fpreg80, buf, dir, sizeof(fpreg80), mod); |
| } else { |
| ULong fpreg64; |
| convert_f80le_to_f64le (buf, (UChar *)&fpreg64); |
| VG_(transfer) (&x86->guest_FPREG[regno-16], &fpreg64, |
| dir, sizeof(fpreg64), mod); |
| } |
| break; |
| } |
| case 24: |
| if (dir == valgrind_to_gdbserver) { |
| // vex only models the rounding bits (see libvex_guest_x86.h) |
| UWord value = 0x037f; |
| value |= x86->guest_FPROUND << 10; |
| VG_(transfer)(&value, buf, dir, size, mod); |
| } else { |
| *mod = False; // GDBTD???? VEX { "fctrl", 1152, 32 }, |
| } |
| break; |
| case 25: |
| if (dir == valgrind_to_gdbserver) { |
| UWord value = x86->guest_FC3210; |
| value |= (x86->guest_FTOP & 7) << 11; |
| VG_(transfer)(&value, buf, dir, size, mod); |
| } else { |
| *mod = False; // GDBTD???? VEX { "fstat", 1184, 32 }, |
| } |
| break; |
| case 26: |
| if (dir == valgrind_to_gdbserver) { |
| // vex doesn't model these precisely |
| UWord value = |
| ((x86->guest_FPTAG[0] ? 0 : 3) << 0) | |
| ((x86->guest_FPTAG[1] ? 0 : 3) << 2) | |
| ((x86->guest_FPTAG[2] ? 0 : 3) << 4) | |
| ((x86->guest_FPTAG[3] ? 0 : 3) << 6) | |
| ((x86->guest_FPTAG[4] ? 0 : 3) << 8) | |
| ((x86->guest_FPTAG[5] ? 0 : 3) << 10) | |
| ((x86->guest_FPTAG[6] ? 0 : 3) << 12) | |
| ((x86->guest_FPTAG[7] ? 0 : 3) << 14); |
| VG_(transfer)(&value, buf, dir, size, mod); |
| } else { |
| *mod = False; // GDBTD???? VEX { "ftag", 1216, 32 }, |
| } |
| break; |
| case 27: *mod = False; break; // GDBTD???? VEX { "fiseg", 1248, 32 }, |
| case 28: *mod = False; break; // GDBTD???? VEX { "fioff", 1280, 32 }, |
| case 29: *mod = False; break; // GDBTD???? VEX { "foseg", 1312, 32 }, |
| case 30: *mod = False; break; // GDBTD???? VEX { "fooff", 1344, 32 }, |
| case 31: *mod = False; break; // GDBTD???? VEX { "fop", 1376, 32 }, |
| case 32: VG_(transfer) (&x86->guest_XMM0, buf, dir, size, mod); break; |
| case 33: VG_(transfer) (&x86->guest_XMM1, buf, dir, size, mod); break; |
| case 34: VG_(transfer) (&x86->guest_XMM2, buf, dir, size, mod); break; |
| case 35: VG_(transfer) (&x86->guest_XMM3, buf, dir, size, mod); break; |
| case 36: VG_(transfer) (&x86->guest_XMM4, buf, dir, size, mod); break; |
| case 37: VG_(transfer) (&x86->guest_XMM5, buf, dir, size, mod); break; |
| case 38: VG_(transfer) (&x86->guest_XMM6, buf, dir, size, mod); break; |
| case 39: VG_(transfer) (&x86->guest_XMM7, buf, dir, size, mod); break; |
| case 40: |
| if (dir == valgrind_to_gdbserver) { |
| // vex only models the rounding bits (see libvex_guest_x86.h) |
| UWord value = 0x1f80; |
| value |= x86->guest_SSEROUND << 13; |
| VG_(transfer)(&value, buf, dir, size, mod); |
| } else { |
| *mod = False; // GDBTD???? VEX { "mxcsr", 2432, 32 }, |
| } |
| break; |
| case 41: *mod = False; break; // GDBTD???? VEX { "orig_eax", 2464, 32 }, |
| default: vg_assert(0); |
| } |
| } |
| |
| static |
| const char* target_xml (Bool shadow_mode) |
| { |
| if (shadow_mode) { |
| #if defined(VGO_linux) |
| return "i386-linux-valgrind.xml"; |
| #else |
| return "i386-coresse-valgrind.xml"; |
| #endif |
| } else { |
| return NULL; |
| } |
| } |
| |
| static CORE_ADDR** target_get_dtv (ThreadState *tst) |
| { |
| VexGuestX86State* x86 = (VexGuestX86State*)&tst->arch.vex; |
| // FIXME: should make the below formally visible from VEX. |
| extern ULong x86g_use_seg_selector ( HWord ldt, HWord gdt, |
| UInt seg_selector, UInt virtual_addr ); |
| |
| ULong dtv_loc_g = x86g_use_seg_selector (x86->guest_LDT, |
| x86->guest_GDT, |
| x86->guest_GS, |
| 0x4); |
| if (dtv_loc_g == 1ULL << 32) { |
| dlog(0, "Error getting x86 dtv\n"); |
| return NULL; |
| } else { |
| CORE_ADDR dtv_loc = dtv_loc_g; |
| return (CORE_ADDR**)dtv_loc; |
| } |
| } |
| |
| static struct valgrind_target_ops low_target = { |
| num_regs, |
| regs, |
| 4, //ESP |
| transfer_register, |
| get_pc, |
| set_pc, |
| "i386", |
| target_xml, |
| target_get_dtv |
| }; |
| |
| void x86_init_architecture (struct valgrind_target_ops *target) |
| { |
| *target = low_target; |
| set_register_cache (regs, num_regs); |
| gdbserver_expedite_regs = expedite_regs; |
| } |
