mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
23d333c090
This change includes many bug fixes, for the NT polyfills, strings, memory, boot, and math libraries which were discovered by adding more tools for recreational programming, such as PC emulation. Lemon has also been vendored because it works so well at parsing languages.
307 lines
9.8 KiB
C
307 lines
9.8 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 "third_party/xed/x86.h"
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#include "tool/build/lib/address.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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#include "tool/build/lib/throw.h"
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static relegated noinline int64_t ComputeAddressReal(const struct Machine *m,
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uint32_t rde, uint8_t *s,
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uint64_t i) {
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switch (ModrmRm(rde)) {
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case 0:
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i += Read16(m->bx);
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i += Read16(m->si);
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break;
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case 1:
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i += Read16(m->bx);
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i += Read16(m->di);
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break;
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case 2:
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s = m->ss;
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i += Read16(m->bp);
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i += Read16(m->si);
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break;
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case 3:
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s = m->ss;
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i += Read16(m->bp);
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i += Read16(m->di);
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break;
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case 4:
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i += Read16(m->si);
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break;
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case 5:
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i += Read16(m->di);
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break;
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case 6:
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if (ModrmMod(rde)) {
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s = m->ss;
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i += Read16(m->bp);
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}
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break;
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case 7:
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i += Read16(m->bx);
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break;
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default:
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unreachable;
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}
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i &= 0xffff;
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return AddSegment(m, rde, i, s);
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}
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int64_t ComputeAddress(const struct Machine *m, uint32_t rde) {
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uint8_t *s = m->ds;
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uint64_t i = m->xedd->op.disp;
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DCHECK(!IsModrmRegister(rde));
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if (Eamode(rde) != XED_MODE_REAL) {
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if (!SibExists(rde)) {
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if (IsRipRelative(rde)) {
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if (Mode(rde) == XED_MODE_LONG) {
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i += m->ip;
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}
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} else {
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i += Read64(RegRexbRm(m, rde));
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if (RexbRm(rde) == 4 || RexbRm(rde) == 5) {
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s = m->ss;
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}
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}
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} else {
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if (SibHasBase(m->xedd, rde)) {
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i += Read64(RegRexbBase(m, rde));
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if (RexbBase(m, rde) == 4 || RexbBase(m, rde) == 5) {
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s = m->ss;
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}
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}
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if (SibHasIndex(m->xedd)) {
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i += Read64(RegRexxIndex(m)) << m->xedd->op.scale;
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}
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}
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if (Eamode(rde) == XED_MODE_LEGACY) {
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i &= 0xffffffff;
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}
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return AddSegment(m, rde, i, s);
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} else {
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return ComputeAddressReal(m, rde, s, i);
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}
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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 *ComputeReserveAddressRead4(struct Machine *m, uint32_t rde) {
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return ComputeReserveAddressRead(m, rde, 4);
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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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