/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│ │vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│ ╞══════════════════════════════════════════════════════════════════════════════╡ │ Copyright 2020 Justine Alexandra Roberts Tunney │ │ │ │ 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; version 2 of the License. │ │ │ │ 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 "libc/log/check.h" #include "third_party/xed/x86.h" #include "tool/build/lib/address.h" #include "tool/build/lib/endian.h" #include "tool/build/lib/machine.h" #include "tool/build/lib/memory.h" #include "tool/build/lib/modrm.h" #include "tool/build/lib/throw.h" /** * Byte register offsets. * * for (i = 0; i < 2; ++i) { // rex * for (j = 0; j < 2; ++j) { // rexb, or rexr * for (k = 0; k < 8; ++k) { // reg, rm, or srm * kByteReg[i << 4 | j << 3 | k] = * i ? (j << 3 | k) * 8 : (k & 0b11) * 8 + ((k & 0b100) >> 2); * } * } * } */ const uint8_t kByteReg[32] = {0x00, 0x08, 0x10, 0x18, 0x01, 0x09, 0x11, 0x19, 0x00, 0x08, 0x10, 0x18, 0x01, 0x09, 0x11, 0x19, 0x00, 0x08, 0x10, 0x18, 0x20, 0x28, 0x30, 0x38, 0x40, 0x48, 0x50, 0x58, 0x60, 0x68, 0x70, 0x78}; int64_t ComputeAddress(const struct Machine *m, uint32_t rde) { uint64_t i; uint8_t *s; DCHECK(!IsModrmRegister(rde)); s = m->ds; i = m->xedd->op.disp; if (Eamode(rde) != XED_MODE_REAL) { if (!SibExists(rde)) { if (IsRipRelative(rde)) { if (Mode(rde) == XED_MODE_LONG) { i += m->ip; } } else { i += Read64(RegRexbRm(m, rde)); if (RexbRm(rde) == 4 || RexbRm(rde) == 5) { s = m->ss; } } } else { if (SibHasBase(m->xedd, rde)) { i += Read64(RegRexbBase(m, rde)); if (RexbBase(m, rde) == 4 || RexbBase(m, rde) == 5) { s = m->ss; } } if (SibHasIndex(m->xedd)) { i += Read64(RegRexxIndex(m)) << m->xedd->op.scale; } } if (Eamode(rde) == XED_MODE_LEGACY) { i &= 0xffffffff; } } else { switch (ModrmRm(rde)) { case 0: i += Read16(m->bx); i += Read16(m->si); break; case 1: i += Read16(m->bx); i += Read16(m->di); break; case 2: s = m->ss; i += Read16(m->bp); i += Read16(m->si); break; case 3: s = m->ss; i += Read16(m->bp); i += Read16(m->di); break; case 4: i += Read16(m->si); break; case 5: i += Read16(m->di); break; case 6: if (ModrmMod(rde)) { s = m->ss; i += Read16(m->bp); } break; case 7: i += Read16(m->bx); break; default: unreachable; } i &= 0xffff; } return AddSegment(m, rde, i, s); } void *ComputeReserveAddressRead(struct Machine *m, uint32_t rde, size_t n) { int64_t v; v = ComputeAddress(m, rde); SetReadAddr(m, v, n); return ReserveAddress(m, v, n); } void *ComputeReserveAddressRead1(struct Machine *m, uint32_t rde) { return ComputeReserveAddressRead(m, rde, 1); } void *ComputeReserveAddressRead4(struct Machine *m, uint32_t rde) { return ComputeReserveAddressRead(m, rde, 4); } void *ComputeReserveAddressRead8(struct Machine *m, uint32_t rde) { return ComputeReserveAddressRead(m, rde, 8); } void *ComputeReserveAddressWrite(struct Machine *m, uint32_t rde, size_t n) { int64_t v; v = ComputeAddress(m, rde); SetWriteAddr(m, v, n); return ReserveAddress(m, v, n); } void *ComputeReserveAddressWrite1(struct Machine *m, uint32_t rde) { return ComputeReserveAddressWrite(m, rde, 1); } void *ComputeReserveAddressWrite4(struct Machine *m, uint32_t rde) { return ComputeReserveAddressWrite(m, rde, 4); } void *ComputeReserveAddressWrite8(struct Machine *m, uint32_t rde) { return ComputeReserveAddressWrite(m, rde, 8); } uint8_t *GetModrmRegisterMmPointerRead(struct Machine *m, uint32_t rde, size_t n) { if (IsModrmRegister(rde)) { return MmRm(m, rde); } else { return ComputeReserveAddressRead(m, rde, n); } } uint8_t *GetModrmRegisterMmPointerRead8(struct Machine *m, uint32_t rde) { return GetModrmRegisterMmPointerRead(m, rde, 8); } uint8_t *GetModrmRegisterMmPointerWrite(struct Machine *m, uint32_t rde, size_t n) { if (IsModrmRegister(rde)) { return MmRm(m, rde); } else { return ComputeReserveAddressWrite(m, rde, n); } } uint8_t *GetModrmRegisterMmPointerWrite8(struct Machine *m, uint32_t rde) { return GetModrmRegisterMmPointerWrite(m, rde, 8); } uint8_t *GetModrmRegisterBytePointerRead(struct Machine *m, uint32_t rde) { int64_t v; if (IsModrmRegister(rde)) { return ByteRexbRm(m, rde); } else { return ComputeReserveAddressRead1(m, rde); } } uint8_t *GetModrmRegisterBytePointerWrite(struct Machine *m, uint32_t rde) { int64_t v; if (IsModrmRegister(rde)) { return ByteRexbRm(m, rde); } else { return ComputeReserveAddressWrite1(m, rde); } } uint8_t *GetModrmRegisterWordPointerRead(struct Machine *m, uint32_t rde, size_t n) { if (IsModrmRegister(rde)) { return RegRexbRm(m, rde); } else { return ComputeReserveAddressRead(m, rde, n); } } uint8_t *GetModrmRegisterWordPointerRead2(struct Machine *m, uint32_t rde) { return GetModrmRegisterWordPointerRead(m, rde, 2); } uint8_t *GetModrmRegisterWordPointerRead4(struct Machine *m, uint32_t rde) { return GetModrmRegisterWordPointerRead(m, rde, 4); } uint8_t *GetModrmRegisterWordPointerRead8(struct Machine *m, uint32_t rde) { return GetModrmRegisterWordPointerRead(m, rde, 8); } uint8_t *GetModrmRegisterWordPointerReadOsz(struct Machine *m, uint32_t rde) { if (!Osz(rde)) { return GetModrmRegisterWordPointerRead8(m, rde); } else { return GetModrmRegisterWordPointerRead2(m, rde); } } uint8_t *GetModrmRegisterWordPointerReadOszRexw(struct Machine *m, uint32_t rde) { if (Rexw(rde)) { return GetModrmRegisterWordPointerRead8(m, rde); } else if (!Osz(rde)) { return GetModrmRegisterWordPointerRead4(m, rde); } else { return GetModrmRegisterWordPointerRead2(m, rde); } } uint8_t *GetModrmRegisterWordPointerWrite(struct Machine *m, uint32_t rde, size_t n) { if (IsModrmRegister(rde)) { return RegRexbRm(m, rde); } else { return ComputeReserveAddressWrite(m, rde, n); } } uint8_t *GetModrmRegisterWordPointerWrite4(struct Machine *m, uint32_t rde) { return GetModrmRegisterWordPointerWrite(m, rde, 4); } uint8_t *GetModrmRegisterWordPointerWrite8(struct Machine *m, uint32_t rde) { return GetModrmRegisterWordPointerWrite(m, rde, 8); } uint8_t *GetModrmRegisterWordPointerWriteOszRexw(struct Machine *m, uint32_t rde) { if (Rexw(rde)) { return GetModrmRegisterWordPointerWrite(m, rde, 8); } else if (!Osz(rde)) { return GetModrmRegisterWordPointerWrite(m, rde, 4); } else { return GetModrmRegisterWordPointerWrite(m, rde, 2); } } uint8_t *GetModrmRegisterWordPointerWriteOsz(struct Machine *m, uint32_t rde) { if (!Osz(rde)) { return GetModrmRegisterWordPointerWrite(m, rde, 8); } else { return GetModrmRegisterWordPointerWrite(m, rde, 2); } } uint8_t *GetModrmRegisterXmmPointerRead(struct Machine *m, uint32_t rde, size_t n) { if (IsModrmRegister(rde)) { return XmmRexbRm(m, rde); } else { return ComputeReserveAddressRead(m, rde, n); } } uint8_t *GetModrmRegisterXmmPointerRead4(struct Machine *m, uint32_t rde) { return GetModrmRegisterXmmPointerRead(m, rde, 4); } uint8_t *GetModrmRegisterXmmPointerRead8(struct Machine *m, uint32_t rde) { return GetModrmRegisterXmmPointerRead(m, rde, 8); } uint8_t *GetModrmRegisterXmmPointerRead16(struct Machine *m, uint32_t rde) { return GetModrmRegisterXmmPointerRead(m, rde, 16); } uint8_t *GetModrmRegisterXmmPointerWrite(struct Machine *m, uint32_t rde, size_t n) { if (IsModrmRegister(rde)) { return XmmRexbRm(m, rde); } else { return ComputeReserveAddressWrite(m, rde, n); } } uint8_t *GetModrmRegisterXmmPointerWrite4(struct Machine *m, uint32_t rde) { return GetModrmRegisterXmmPointerWrite(m, rde, 4); } uint8_t *GetModrmRegisterXmmPointerWrite8(struct Machine *m, uint32_t rde) { return GetModrmRegisterXmmPointerWrite(m, rde, 8); } uint8_t *GetModrmRegisterXmmPointerWrite16(struct Machine *m, uint32_t rde) { return GetModrmRegisterXmmPointerWrite(m, rde, 16); }