183 lines
5.5 KiB
C
183 lines
5.5 KiB
C
/*
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rep movsb regression
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Copyright(c) 2015 Chris Eagle
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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version 2 as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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 02110-1301, USA.
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*/
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#define __STDC_FORMAT_MACROS
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#include <string.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unicorn/unicorn.h>
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unsigned char PROGRAM[] =
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"\xbe\x00\x00\x20\x00\xbf\x00\x10\x20\x00\xb9\x14\x00\x00\x00\xf3"
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"\xa4\xf4";
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// total size: 18 bytes
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/*
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bits 32
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; assumes code section at 0x100000 r-x
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; assumes data section at 0x200000-0x202000, rw-
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mov esi, 0x200000
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mov edi, 0x201000
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mov ecx, 20
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rep movsb
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hlt
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*/
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static int log_num = 1;
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// callback for tracing instruction
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static void hook_code(uc_engine *uc, uint64_t addr, uint32_t size, void *user_data)
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{
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uint8_t opcode;
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if (uc_mem_read(uc, addr, &opcode, 1) != UC_ERR_OK) {
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printf("not ok %d - uc_mem_read fail during hook_code callback, addr: 0x%" PRIx64 "\n", log_num++, addr);
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_exit(-1);
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}
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switch (opcode) {
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case 0xf4: //hlt
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printf("# Handling HLT\n");
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if (uc_emu_stop(uc) != UC_ERR_OK) {
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printf("not ok %d - uc_emu_stop fail during hook_code callback, addr: 0x%" PRIx64 "\n", log_num++, addr);
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_exit(-1);
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}
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else {
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printf("ok %d - hlt encountered, uc_emu_stop called\n", log_num++);
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}
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break;
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default: //all others
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break;
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}
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}
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// callback for tracing memory access (READ or WRITE)
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static void hook_mem_write(uc_engine *uc, uc_mem_type type,
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uint64_t addr, int size, int64_t value, void *user_data)
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{
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printf("# write to memory at 0x%"PRIx64 ", data size = %u, data value = 0x%"PRIx64 "\n", addr, size, value);
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if (addr < 0x201000L) {
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//this is actually a read, we don't write in this range
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printf("not ok %d - write hook called for read of 0x%"PRIx64 ", data size = %u, data value = 0x%"PRIx64 "\n", log_num++, addr, size, value);
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}
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else {
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printf("ok %d - write hook called for write of 0x%"PRIx64 ", data size = %u, data value = 0x%"PRIx64 "\n", log_num++, addr, size, value);
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}
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}
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int main(int argc, char **argv, char **envp)
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{
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uc_engine *uc;
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uc_hook trace1, trace2;
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uc_err err;
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uint8_t buf1[100], readbuf[100];
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printf("# rep movsb test\n");
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memset(buf1, 'A', 20);
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// Initialize emulator in X86-32bit mode
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err = uc_open(UC_ARCH_X86, UC_MODE_32, &uc);
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if (err) {
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printf("not ok %d - Failed on uc_open() with error returned: %u\n", log_num++, err);
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return 1;
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}
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else {
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printf("ok %d - uc_open() success\n", log_num++);
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}
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uc_mem_map(uc, 0x100000, 0x1000, UC_PROT_READ);
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uc_mem_map(uc, 0x200000, 0x2000, UC_PROT_READ | UC_PROT_WRITE);
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// fill in the data that we want to copy
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if (uc_mem_write(uc, 0x200000, buf1, 20)) {
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printf("not ok %d - Failed to write read buffer to memory, quit!\n", log_num++);
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return 2;
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}
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else {
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printf("ok %d - Read buffer written to memory\n", log_num++);
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}
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// write machine code to be emulated to memory
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if (uc_mem_write(uc, 0x100000, PROGRAM, sizeof(PROGRAM))) {
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printf("not ok %d - Failed to write emulation code to memory, quit!\n", log_num++);
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return 4;
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}
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else {
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printf("ok %d - Program written to memory\n", log_num++);
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}
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if (uc_hook_add(uc, &trace2, UC_HOOK_CODE, hook_code, NULL, 1, 0) != UC_ERR_OK) {
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printf("not ok %d - Failed to install UC_HOOK_CODE handler\n", log_num++);
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return 5;
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}
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else {
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printf("ok %d - UC_HOOK_CODE installed\n", log_num++);
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}
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// intercept memory write events only, NOT read events
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if (uc_hook_add(uc, &trace1, UC_HOOK_MEM_WRITE, hook_mem_write, NULL, 1, 0) != UC_ERR_OK) {
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printf("not ok %d - Failed to install UC_HOOK_MEM_WRITE handler\n", log_num++);
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return 6;
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}
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else {
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printf("ok %d - UC_HOOK_MEM_WRITE installed\n", log_num++);
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}
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// emulate machine code until told to stop by hook_code
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printf("# BEGIN execution\n");
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err = uc_emu_start(uc, 0x100000, 0x101000, 0, 0);
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if (err != UC_ERR_OK) {
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printf("not ok %d - Failure on uc_emu_start() with error %u:%s\n", log_num++, err, uc_strerror(err));
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return 8;
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}
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else {
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printf("ok %d - uc_emu_start complete\n", log_num++);
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}
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printf("# END execution\n");
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//make sure that data got copied
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// fill in sections that shouldn't get touched
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if (uc_mem_read(uc, 0x201000, readbuf, 20)) {
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printf("not ok %d - Failed to read random buffer 1 from memory\n", log_num++);
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}
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else {
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printf("ok %d - Random buffer 1 read from memory\n", log_num++);
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if (memcmp(buf1, readbuf, 20)) {
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printf("not ok %d - write buffer contents are incorrect\n", log_num++);
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}
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else {
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printf("ok %d - write buffer contents are correct\n", log_num++);
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}
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}
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if (uc_close(uc) == UC_ERR_OK) {
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printf("ok %d - uc_close complete\n", log_num++);
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}
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else {
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printf("not ok %d - uc_close complete\n", log_num++);
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}
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return 0;
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}
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