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https://github.com/jart/cosmopolitan.git
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416fd86676
- Emulator can now test the αcτµαlly pδrταblε εxεcµταblε bootloader - Whipped up a webserver named redbean. It services 150k requests per second on a single core. Bundling assets inside zip enables extremely fast serving for two reasons. The first is that zip central directory lookups go faster than stat() system calls. The second is that both zip and gzip content-encoding use DEFLATE, therefore, compressed responses can be served via the sendfile() system call which does an in-kernel copy directly from the zip executable structure. Also note that red bean zip executables can be deployed easily to all platforms, since these native executables work on Linux, Mac, BSD, and Windows. - Address sanitizer now works very well
319 lines
10 KiB
C
319 lines
10 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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/**
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* Byte register offsets.
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*
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* for (i = 0; i < 2; ++i) { // rex
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* for (j = 0; j < 2; ++j) { // rexb, or rexr
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* for (k = 0; k < 8; ++k) { // reg, rm, or srm
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* kByteReg[i << 4 | j << 3 | k] =
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* i ? (j << 3 | k) * 8 : (k & 0b11) * 8 + ((k & 0b100) >> 2);
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* }
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* }
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* }
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*/
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const uint8_t kByteReg[32] = {0x00, 0x08, 0x10, 0x18, 0x01, 0x09, 0x11, 0x19,
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0x00, 0x08, 0x10, 0x18, 0x01, 0x09, 0x11, 0x19,
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0x00, 0x08, 0x10, 0x18, 0x20, 0x28, 0x30, 0x38,
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0x40, 0x48, 0x50, 0x58, 0x60, 0x68, 0x70, 0x78};
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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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uint8_t *s;
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DCHECK(!IsModrmRegister(rde));
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s = m->ds;
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i = m->xedd->op.disp;
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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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} else {
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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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}
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return AddSegment(m, rde, i, s);
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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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