249 lines
8.3 KiB
C
249 lines
8.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/log/check.h"
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#include "tool/build/lib/endian.h"
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#include "tool/build/lib/machine.h"
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#include "tool/build/lib/memory.h"
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#include "tool/build/lib/modrm.h"
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/**
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* Computes virtual address based on modrm and sib bytes.
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*/
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int64_t ComputeAddress(const struct Machine *m, uint32_t rde) {
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uint64_t i;
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DCHECK(m->xedd->op.has_modrm);
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DCHECK(!IsModrmRegister(rde));
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i = m->xedd->op.disp;
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if (!SibExists(rde)) {
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if (IsRipRelative(rde)) {
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i += m->ip;
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} else {
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i += Read64(RegRexbRm(m, rde));
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}
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} else {
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DCHECK(m->xedd->op.has_sib);
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if (SibHasBase(rde)) {
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i += Read64(RegRexbBase(m, rde));
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}
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if (SibHasIndex(rde)) {
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i += Read64(RegRexxIndex(m, rde)) << m->xedd->op.scale;
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}
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}
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i += GetSegment(m);
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if (Asz(rde)) i &= 0xffffffff;
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return i;
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}
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void *ComputeReserveAddressRead(struct Machine *m, uint32_t rde, size_t n) {
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int64_t v;
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v = ComputeAddress(m, rde);
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SetReadAddr(m, v, n);
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return ReserveAddress(m, v, n);
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}
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void *ComputeReserveAddressRead1(struct Machine *m, uint32_t rde) {
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return ComputeReserveAddressRead(m, rde, 1);
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}
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void *ComputeReserveAddressRead8(struct Machine *m, uint32_t rde) {
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return ComputeReserveAddressRead(m, rde, 8);
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}
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void *ComputeReserveAddressWrite(struct Machine *m, uint32_t rde, size_t n) {
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int64_t v;
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v = ComputeAddress(m, rde);
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SetWriteAddr(m, v, n);
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return ReserveAddress(m, v, n);
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}
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void *ComputeReserveAddressWrite1(struct Machine *m, uint32_t rde) {
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return ComputeReserveAddressWrite(m, rde, 1);
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}
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void *ComputeReserveAddressWrite4(struct Machine *m, uint32_t rde) {
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return ComputeReserveAddressWrite(m, rde, 4);
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}
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void *ComputeReserveAddressWrite8(struct Machine *m, uint32_t rde) {
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return ComputeReserveAddressWrite(m, rde, 8);
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}
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uint8_t *GetModrmRegisterMmPointerRead(struct Machine *m, uint32_t rde,
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size_t n) {
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if (IsModrmRegister(rde)) {
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return MmRm(m, rde);
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} else {
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return ComputeReserveAddressRead(m, rde, n);
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}
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}
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uint8_t *GetModrmRegisterMmPointerRead8(struct Machine *m, uint32_t rde) {
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return GetModrmRegisterMmPointerRead(m, rde, 8);
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}
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uint8_t *GetModrmRegisterMmPointerWrite(struct Machine *m, uint32_t rde,
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size_t n) {
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if (IsModrmRegister(rde)) {
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return MmRm(m, rde);
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} else {
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return ComputeReserveAddressWrite(m, rde, n);
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}
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}
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uint8_t *GetModrmRegisterMmPointerWrite8(struct Machine *m, uint32_t rde) {
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return GetModrmRegisterMmPointerWrite(m, rde, 8);
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}
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uint8_t *GetModrmRegisterBytePointerRead(struct Machine *m, uint32_t rde) {
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int64_t v;
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if (IsModrmRegister(rde)) {
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return ByteRexbRm(m, rde);
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} else {
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return ComputeReserveAddressRead1(m, rde);
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}
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}
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uint8_t *GetModrmRegisterBytePointerWrite(struct Machine *m, uint32_t rde) {
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int64_t v;
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if (IsModrmRegister(rde)) {
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return ByteRexbRm(m, rde);
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} else {
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return ComputeReserveAddressWrite1(m, rde);
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}
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}
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uint8_t *GetModrmRegisterWordPointerRead(struct Machine *m, uint32_t rde,
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size_t n) {
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if (IsModrmRegister(rde)) {
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return RegRexbRm(m, rde);
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} else {
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return ComputeReserveAddressRead(m, rde, n);
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}
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}
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uint8_t *GetModrmRegisterWordPointerRead2(struct Machine *m, uint32_t rde) {
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return GetModrmRegisterWordPointerRead(m, rde, 2);
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}
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uint8_t *GetModrmRegisterWordPointerRead4(struct Machine *m, uint32_t rde) {
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return GetModrmRegisterWordPointerRead(m, rde, 4);
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}
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uint8_t *GetModrmRegisterWordPointerRead8(struct Machine *m, uint32_t rde) {
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return GetModrmRegisterWordPointerRead(m, rde, 8);
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}
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uint8_t *GetModrmRegisterWordPointerReadOsz(struct Machine *m, uint32_t rde) {
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if (!Osz(rde)) {
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return GetModrmRegisterWordPointerRead8(m, rde);
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} else {
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return GetModrmRegisterWordPointerRead2(m, rde);
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}
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}
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uint8_t *GetModrmRegisterWordPointerReadOszRexw(struct Machine *m,
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uint32_t rde) {
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if (Rexw(rde)) {
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return GetModrmRegisterWordPointerRead8(m, rde);
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} else if (!Osz(rde)) {
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return GetModrmRegisterWordPointerRead4(m, rde);
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} else {
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return GetModrmRegisterWordPointerRead2(m, rde);
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}
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}
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uint8_t *GetModrmRegisterWordPointerWrite(struct Machine *m, uint32_t rde,
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size_t n) {
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if (IsModrmRegister(rde)) {
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return RegRexbRm(m, rde);
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} else {
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return ComputeReserveAddressWrite(m, rde, n);
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}
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}
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uint8_t *GetModrmRegisterWordPointerWrite4(struct Machine *m, uint32_t rde) {
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return GetModrmRegisterWordPointerWrite(m, rde, 4);
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}
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uint8_t *GetModrmRegisterWordPointerWrite8(struct Machine *m, uint32_t rde) {
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return GetModrmRegisterWordPointerWrite(m, rde, 8);
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}
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uint8_t *GetModrmRegisterWordPointerWriteOszRexw(struct Machine *m,
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uint32_t rde) {
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if (Rexw(rde)) {
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return GetModrmRegisterWordPointerWrite(m, rde, 8);
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} else if (!Osz(rde)) {
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return GetModrmRegisterWordPointerWrite(m, rde, 4);
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} else {
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return GetModrmRegisterWordPointerWrite(m, rde, 2);
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}
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}
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uint8_t *GetModrmRegisterWordPointerWriteOsz(struct Machine *m, uint32_t rde) {
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if (!Osz(rde)) {
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return GetModrmRegisterWordPointerWrite(m, rde, 8);
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} else {
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return GetModrmRegisterWordPointerWrite(m, rde, 2);
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}
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}
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uint8_t *GetModrmRegisterXmmPointerRead(struct Machine *m, uint32_t rde,
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size_t n) {
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if (IsModrmRegister(rde)) {
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return XmmRexbRm(m, rde);
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} else {
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return ComputeReserveAddressRead(m, rde, n);
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}
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}
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uint8_t *GetModrmRegisterXmmPointerRead4(struct Machine *m, uint32_t rde) {
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return GetModrmRegisterXmmPointerRead(m, rde, 4);
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}
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uint8_t *GetModrmRegisterXmmPointerRead8(struct Machine *m, uint32_t rde) {
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return GetModrmRegisterXmmPointerRead(m, rde, 8);
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}
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uint8_t *GetModrmRegisterXmmPointerRead16(struct Machine *m, uint32_t rde) {
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return GetModrmRegisterXmmPointerRead(m, rde, 16);
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}
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uint8_t *GetModrmRegisterXmmPointerWrite(struct Machine *m, uint32_t rde,
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size_t n) {
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if (IsModrmRegister(rde)) {
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return XmmRexbRm(m, rde);
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} else {
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return ComputeReserveAddressWrite(m, rde, n);
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}
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}
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uint8_t *GetModrmRegisterXmmPointerWrite4(struct Machine *m, uint32_t rde) {
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return GetModrmRegisterXmmPointerWrite(m, rde, 4);
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}
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uint8_t *GetModrmRegisterXmmPointerWrite8(struct Machine *m, uint32_t rde) {
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return GetModrmRegisterXmmPointerWrite(m, rde, 8);
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}
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uint8_t *GetModrmRegisterXmmPointerWrite16(struct Machine *m, uint32_t rde) {
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return GetModrmRegisterXmmPointerWrite(m, rde, 16);
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}
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