mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-03-04 07:58:21 +00:00
23e235b7a5
This change integrates e58abc1110b335a3341e8ad5821ad8e3880d9bb2 from https://github.com/ahgamut/musl-cross-make/ which fixes the issues we were having with our C language extension for symbolic constants. This change also performs some code cleanup and bug fixes to getaddrinfo(). It's now possible to compile projects like ncurses, readline and python without needing to patch anything upstream, except maybe a line or two. Pretty soon it should be possible to build a Linux distro on Cosmo.
324 lines
10 KiB
C
324 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "tool/build/lib/modrm.h"
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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/throw.h"
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/**
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* Compactly represents important parts of xed ild result.
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*/
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uint32_t EncodeRde(struct XedDecodedInst *x) {
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uint8_t kWordLog2[2][2][2] = {{{2, 3}, {1, 3}}, {{0, 0}, {0, 0}}};
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uint32_t osz = x->op.osz ^ x->op.realmode;
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return kWordLog2[~x->op.opcode & 1][osz][x->op.rexw] << 28 |
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x->op.mode << 26 | kXedEamode[x->op.asz][x->op.mode] << 24 |
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(uint32_t)x->op.rep << 30 | x->op.mod << 22 | x->op.asz << 17 |
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x->op.seg_ovd << 18 | x->op.rexw << 6 | osz << 5 |
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(x->op.rex << 4 | x->op.rexb << 3 | x->op.srm) << 12 |
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(x->op.rex << 4 | x->op.rexb << 3 | x->op.rm) << 7 |
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(x->op.rex << 4 | x->op.rexr << 3 | x->op.reg);
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}
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struct AddrSeg LoadEffectiveAddress(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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} 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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__builtin_unreachable();
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}
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i &= 0xffff;
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}
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return (struct AddrSeg){i, s};
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}
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int64_t ComputeAddress(const struct Machine *m, uint32_t rde) {
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struct AddrSeg ea;
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ea = LoadEffectiveAddress(m, rde);
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return AddSegment(m, rde, ea.addr, ea.seg);
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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 *GetModrmRegisterWordPointerWrite2(struct Machine *m, uint32_t rde) {
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return GetModrmRegisterWordPointerWrite(m, rde, 2);
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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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