75 lines
3.5 KiB
C
75 lines
3.5 KiB
C
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/*-*- 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/macros.h"
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#include "libc/str/str.h"
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#include "third_party/xed/x86.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/stats.h"
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#include "tool/build/lib/throw.h"
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static bool IsOpcodeEqual(uint8_t *a, uint8_t b[16], size_t size) {
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if (likely(size)) {
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return memcmp(a, b, size) == 0;
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} else {
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return false;
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}
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}
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void LoadInstruction(struct Machine *m) {
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unsigned i;
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enum XedError err;
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uint8_t *addr, *toil, copy[15];
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if ((i = 0x1000 - (m->ip & 0xfff)) >= 15) {
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if (ROUNDDOWN(m->ip, 0x1000) == m->codevirt && m->ip) {
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addr = m->codereal + (m->ip & 0xfff);
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} else {
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m->codevirt = ROUNDDOWN(m->ip, 0x1000);
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m->codereal = ResolveAddress(m, m->codevirt);
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addr = m->codereal + (m->ip & 0xfff);
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}
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m->xedd = m->icache + (m->ip & (ARRAYLEN(m->icache) - 1));
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if (IsOpcodeEqual(addr, m->xedd->bytes, m->xedd->length)) {
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taken++;
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} else {
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ntaken++;
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xed_decoded_inst_zero_set_mode(m->xedd, XED_MACHINE_MODE_LONG_64);
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if (xed_instruction_length_decode(m->xedd, addr, 15)) {
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HaltMachine(m, kMachineDecodeError);
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}
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}
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} else {
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m->xedd = m->icache;
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xed_decoded_inst_zero_set_mode(m->xedd, XED_MACHINE_MODE_LONG_64);
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addr = ResolveAddress(m, m->ip);
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if ((toil = FindReal(m, m->ip + i))) {
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memcpy(copy, addr, i);
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memcpy(copy + i, toil, 15 - i);
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if ((err = xed_instruction_length_decode(m->xedd, copy, 15))) {
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HaltMachine(m, kMachineDecodeError);
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}
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} else {
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if ((err = xed_instruction_length_decode(m->xedd, addr, i))) {
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HaltMachine(m, kMachineDecodeError);
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}
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}
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}
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}
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