FRET-qemu/softmmu/main.c

/*
 * QEMU System Emulator
 *
 * Copyright (c) 2003-2020 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"
#include "qemu-common.h"
#include "sysemu/sysemu.h"

#ifdef CONFIG_SDL
#if defined(__APPLE__) || defined(main)
#include <SDL.h>
static int qemu_main(int argc, char **argv, char **envp);
int main(int argc, char **argv)
{
    return qemu_main(argc, argv, NULL);
}
#undef main
#define main qemu_main
#endif
#endif /* CONFIG_SDL */

#ifdef CONFIG_COCOA
#undef main
#define main qemu_main
#endif /* CONFIG_COCOA */

/* Begin LibAFL instrumentation */
#include "sysemu/runstate.h"
#include "sysemu/cpu-timers.h"
#include "migration/snapshot.h"
#include "hw/core/cpu.h"
#include "qapi/error.h"
#include "exec/memory.h"
void libafl_qemu_main_loop( void );
void libafl_qemu_run( void );
void libafl_qemu_sys_init(int argc, char **argv, char **envp);
void libafl_qemu_cleanup( void );

void libafl_qemu_sys_init(int argc, char **argv, char **envp) { qemu_init(argc, argv, envp); }
void libafl_qemu_cleanup( void ) { qemu_cleanup(); }
void libafl_qemu_set_native_breakpoint( vaddr );
void libafl_qemu_remove_native_breakpoint( vaddr );
int libafl_snapshot_save( const char* );
int libafl_snapshot_load( const char* );
void libafl_phys_read(vaddr, uint8_t*, int);
void libafl_phys_write(vaddr, uint8_t*, int);
int64_t libafl_get_clock( void );

#ifdef TARGET_ARM
extern void libafl_start_int_timer(void);
#endif
void libafl_qemu_main_loop( void )
{
    #ifdef TARGET_ARM
    libafl_start_int_timer();
    #endif
    vm_start();
    qemu_main_loop();
}
void libafl_qemu_run( void ) { libafl_qemu_main_loop(); }

void libafl_qemu_set_native_breakpoint(vaddr pc)
{
    CPUState *cpu;
    CPU_FOREACH(cpu) {
        cpu_breakpoint_insert(cpu, pc, BP_GDB, NULL);
    }
}

void libafl_qemu_remove_native_breakpoint(vaddr pc)
{
    CPUState *cpu;
    CPU_FOREACH(cpu) {
        cpu_breakpoint_remove(cpu, pc, BP_GDB);
    }
}

int libafl_snapshot_save( const char* name )
{
    Error *err = NULL;
    save_snapshot(name, true, NULL, false, NULL, &err);
    return err == 0;
}

int libafl_snapshot_load( const char* name )
{
    Error *err = NULL;
    load_snapshot(name, NULL, false, NULL, &err);
    return err == 0;
}

void libafl_phys_read(vaddr addr, uint8_t* buf, int len)
{
    cpu_physical_memory_read(addr, buf, len);
}
void libafl_phys_write(vaddr addr, uint8_t* buf, int len)
{
    cpu_physical_memory_write(addr, buf, len);
}

int64_t libafl_get_clock( void )
{
    return icount_get_raw();
}

#ifndef AS_SHARED_LIB
#ifdef TARGET_ARM
extern unsigned int libafl_int_offset;
#endif
int main(int argc, char **argv, char **envp)
{
    qemu_init(argc, argv, envp);
    qemu_main_loop();
    qemu_cleanup();
    //LIBAFL Instrumentation Demo
    /*
    // unsigned char buf[32] = "_`abcdefghijklmnopqrstuvwxyz{|}~";
#ifdef TARGET_ARM
    libafl_int_offset = 375000;
#endif
    // unsigned char buf[32] = "\x02\x9b\x02\x9b\x02\x9b\x02\x9b"; // 0xFA71 x 4
    unsigned char buf[32] = "\x05\x29\x07\x1f\x0b\x17\x01\x17"; // 5*73 7*59 11*43
    unsigned char len = 8;
    libafl_qemu_sys_init(argc, argv, envp);
    int pheader = 0x5be4;
    libafl_phys_write(0x20000110-0x20000100+pheader, buf,32);
    libafl_phys_read(0x20000110-0x20000100+pheader, buf,32);
    libafl_phys_write(0x20000108-0x20000100+pheader, &len,1);
    printf("FUZZ_INPUT[0]: %x\n", buf[0]);
    libafl_qemu_set_native_breakpoint(0xae);
    libafl_snapshot_save("Start");
    int counter = 3;
    do {
        libafl_qemu_main_loop();
        libafl_snapshot_load("Start");
        puts("Reload has occured");
        counter--;
    } while (runstate_check(RUN_STATE_DEBUG) && counter);
    libafl_qemu_cleanup();
    */
    /*
    // Clock comparison
    unsigned char ex1[32] = "_`abcdefghijklmnopqrstuvwxyz{|}~";
    // unsigned char ex1[32] = "a!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!";
    unsigned char ex2[32] = "a!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!";
    libafl_qemu_sys_init(argc, argv, envp);
    libafl_qemu_set_native_breakpoint(0x4be0);
    libafl_snapshot_save("Start");
    libafl_phys_write(0x20000110-0x20000100+0x00006ae4, ex1,32);
    libafl_qemu_main_loop();
    printf("Post ex1: %ld\n",libafl_get_clock());
    libafl_snapshot_load("Start");
    libafl_phys_write(0x20000110-0x20000100+0x00006ae4, ex2,32);
    libafl_qemu_main_loop();
    printf("Post ex2: %ld\n",libafl_get_clock());
    */

    return 0;
}
#endif

/* End LibAFL instrumentation */