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add regression for callbacks generated during movsb

This commit is contained in:
Chris Eagle 2015-08-31 23:52:22 -07:00
parent 9dbd674a04
commit 95059407ee
1 changed files with 183 additions and 0 deletions
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regress/rep_movsb.c Normal file
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/*
rep movsb regression
Copyright(c) 2015 Chris Eagle
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#define __STDC_FORMAT_MACROS
#include <inttypes.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unicorn/unicorn.h>
unsigned char PROGRAM[] =
"\xbe\x00\x00\x20\x00\xbf\x00\x10\x20\x00\xb9\x14\x00\x00\x00\xf3"
"\xa4\xf4";
// total size: 18 bytes
/*
bits 32
; assumes code section at 0x100000 r-x
; assumes data section at 0x200000-0x202000, rw-
mov esi, 0x200000
mov edi, 0x201000
mov ecx, 20
rep movsb
hlt
*/
static int log_num = 1;
// callback for tracing instruction
static void hook_code(uch handle, uint64_t addr, uint32_t size, void *user_data)
{
uint8_t opcode;
if (uc_mem_read(handle, addr, &opcode, 1) != UC_ERR_OK) {
printf("not ok %d - uc_mem_read fail during hook_code callback, addr: 0x%" PRIx64 "\n", log_num++, addr);
_exit(-1);
}
switch (opcode) {
case 0xf4: //hlt
printf("# Handling HLT\n");
if (uc_emu_stop(handle) != UC_ERR_OK) {
printf("not ok %d - uc_emu_stop fail during hook_code callback, addr: 0x%" PRIx64 "\n", log_num++, addr);
_exit(-1);
}
else {
printf("ok %d - hlt encountered, uc_emu_stop called\n", log_num++);
}
break;
default: //all others
break;
}
}
// callback for tracing memory access (READ or WRITE)
static void hook_mem_write(uch handle, uc_mem_type type,
uint64_t addr, int size, int64_t value, void *user_data)
{
printf("# write to memory at 0x%"PRIx64 ", data size = %u, data value = 0x%"PRIx64 "\n", addr, size, value);
if (addr < 0x201000L) {
//this is actually a read, we don't write in this range
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);
}
else {
printf("ok %d - write hook called for write of 0x%"PRIx64 ", data size = %u, data value = 0x%"PRIx64 "\n", log_num++, addr, size, value);
}
}
int main(int argc, char **argv, char **envp)
{
uch handle, trace1, trace2;
uc_err err;
uint8_t buf1[100], readbuf[100];
printf("# rep movsb test\n");
memset(buf1, 'A', 20);
// Initialize emulator in X86-32bit mode
err = uc_open(UC_ARCH_X86, UC_MODE_32, &handle);
if (err) {
printf("not ok %d - Failed on uc_open() with error returned: %u\n", log_num++, err);
return 1;
}
else {
printf("ok %d - uc_open() success\n", log_num++);
}
uc_mem_map(handle, 0x100000, 0x1000, UC_PROT_READ);
uc_mem_map(handle, 0x200000, 0x2000, UC_PROT_READ | UC_PROT_WRITE);
// fill in the data that we want to copy
if (uc_mem_write(handle, 0x200000, (uint8_t*)buf1, 20)) {
printf("not ok %d - Failed to write read buffer to memory, quit!\n", log_num++);
return 2;
}
else {
printf("ok %d - Read buffer written to memory\n", log_num++);
}
// write machine code to be emulated to memory
if (uc_mem_write(handle, 0x100000, PROGRAM, sizeof(PROGRAM))) {
printf("not ok %d - Failed to write emulation code to memory, quit!\n", log_num++);
return 4;
}
else {
printf("ok %d - Program written to memory\n", log_num++);
}
if (uc_hook_add(handle, &trace2, UC_HOOK_CODE, hook_code, NULL, 1, 0) != UC_ERR_OK) {
printf("not ok %d - Failed to install UC_HOOK_CODE handler\n", log_num++);
return 5;
}
else {
printf("ok %d - UC_HOOK_CODE installed\n", log_num++);
}
// intercept memory write events only, NOT read events
if (uc_hook_add(handle, &trace1, UC_HOOK_MEM_WRITE, hook_mem_write, NULL) != UC_ERR_OK) {
printf("not ok %d - Failed to install UC_HOOK_MEM_WRITE handler\n", log_num++);
return 6;
}
else {
printf("ok %d - UC_HOOK_MEM_WRITE installed\n", log_num++);
}
// emulate machine code until told to stop by hook_code
printf("# BEGIN execution\n");
err = uc_emu_start(handle, 0x100000, 0x101000, 0, 0);
if (err != UC_ERR_OK) {
printf("not ok %d - Failure on uc_emu_start() with error %u:%s\n", log_num++, err, uc_strerror(err));
return 8;
}
else {
printf("ok %d - uc_emu_start complete\n", log_num++);
}
printf("# END execution\n");
//make sure that data got copied
// fill in sections that shouldn't get touched
if (uc_mem_read(handle, 0x201000, (uint8_t*)readbuf, 20)) {
printf("not ok %d - Failed to read random buffer 1 from memory\n", log_num++);
}
else {
printf("ok %d - Random buffer 1 read from memory\n", log_num++);
if (memcmp(buf1, readbuf, 20)) {
printf("not ok %d - write buffer contents are incorrect\n", log_num++);
}
else {
printf("ok %d - write buffer contents are correct\n", log_num++);
}
}
if (uc_close(&handle) == UC_ERR_OK) {
printf("ok %d - uc_close complete\n", log_num++);
}
else {
printf("not ok %d - uc_close complete\n", log_num++);
}
return 0;
}