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uc.c
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/* Unicorn Emulator Engine */
/* By Nguyen Anh Quynh <[email protected]>, 2015 */
/* Modified for Unicorn Engine by Chen Huitao<[email protected]>, 2020 */
#include "unicorn/unicorn.h"
#if defined(UNICORN_HAS_OSXKERNEL)
#include <libkern/libkern.h>
#else
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#endif
#include <time.h> // nanosleep
#include <string.h>
#include "uc_priv.h"
// target specific headers
#include "qemu/target/m68k/unicorn.h"
#include "qemu/target/i386/unicorn.h"
#include "qemu/target/arm/unicorn.h"
#include "qemu/target/mips/unicorn.h"
#include "qemu/target/sparc/unicorn.h"
#include "qemu/target/ppc/unicorn.h"
#include "qemu/target/riscv/unicorn.h"
#include "qemu/target/s390x/unicorn.h"
#include "qemu/target/tricore/unicorn.h"
#include "qemu/include/tcg/tcg-apple-jit.h"
#include "qemu/include/qemu/queue.h"
#include "qemu-common.h"
static void clear_deleted_hooks(uc_engine *uc);
static uc_err uc_snapshot(uc_engine *uc);
static uc_err uc_restore_latest_snapshot(uc_engine *uc);
#if defined(__APPLE__) && defined(HAVE_PTHREAD_JIT_PROTECT) && \
(defined(__arm__) || defined(__aarch64__))
static void save_jit_state(uc_engine *uc)
{
if (!uc->nested) {
uc->thread_executable_entry = thread_executable();
uc->current_executable = uc->thread_executable_entry;
}
uc->nested += 1;
}
static void restore_jit_state(uc_engine *uc)
{
assert(uc->nested > 0);
if (uc->nested == 1) {
assert_executable(uc->current_executable);
if (uc->current_executable != uc->thread_executable_entry) {
if (uc->thread_executable_entry) {
jit_write_protect(true);
} else {
jit_write_protect(false);
}
}
}
uc->nested -= 1;
}
#else
static void save_jit_state(uc_engine *uc)
{
(void)uc;
}
static void restore_jit_state(uc_engine *uc)
{
(void)uc;
}
#endif
static void *hook_insert(struct list *l, struct hook *h)
{
void *item = list_insert(l, (void *)h);
if (item) {
h->refs++;
}
return item;
}
static void *hook_append(struct list *l, struct hook *h)
{
void *item = list_append(l, (void *)h);
if (item) {
h->refs++;
}
return item;
}
static void hook_invalidate_region(void *key, void *data, void *opaq)
{
uc_engine *uc = (uc_engine *)opaq;
HookedRegion *region = (HookedRegion *)key;
uc->uc_invalidate_tb(uc, region->start, region->length);
}
static void hook_delete(void *data)
{
struct hook *h = (struct hook *)data;
h->refs--;
if (h->refs == 0) {
g_hash_table_destroy(h->hooked_regions);
free(h);
}
}
UNICORN_EXPORT
unsigned int uc_version(unsigned int *major, unsigned int *minor)
{
if (major != NULL && minor != NULL) {
*major = UC_API_MAJOR;
*minor = UC_API_MINOR;
}
return (UC_API_MAJOR << 24) + (UC_API_MINOR << 16) + (UC_API_PATCH << 8) +
UC_API_EXTRA;
}
static uc_err default_reg_read(void *env, int mode, unsigned int regid,
void *value, size_t *size)
{
return UC_ERR_HANDLE;
}
static uc_err default_reg_write(void *env, int mode, unsigned int regid,
const void *value, size_t *size, int *setpc)
{
return UC_ERR_HANDLE;
}
UNICORN_EXPORT
uc_err uc_errno(uc_engine *uc)
{
return uc->errnum;
}
UNICORN_EXPORT
const char *uc_strerror(uc_err code)
{
switch (code) {
default:
return "Unknown error code";
case UC_ERR_OK:
return "OK (UC_ERR_OK)";
case UC_ERR_NOMEM:
return "No memory available or memory not present (UC_ERR_NOMEM)";
case UC_ERR_ARCH:
return "Invalid/unsupported architecture (UC_ERR_ARCH)";
case UC_ERR_HANDLE:
return "Invalid handle (UC_ERR_HANDLE)";
case UC_ERR_MODE:
return "Invalid mode (UC_ERR_MODE)";
case UC_ERR_VERSION:
return "Different API version between core & binding (UC_ERR_VERSION)";
case UC_ERR_READ_UNMAPPED:
return "Invalid memory read (UC_ERR_READ_UNMAPPED)";
case UC_ERR_WRITE_UNMAPPED:
return "Invalid memory write (UC_ERR_WRITE_UNMAPPED)";
case UC_ERR_FETCH_UNMAPPED:
return "Invalid memory fetch (UC_ERR_FETCH_UNMAPPED)";
case UC_ERR_HOOK:
return "Invalid hook type (UC_ERR_HOOK)";
case UC_ERR_INSN_INVALID:
return "Invalid instruction (UC_ERR_INSN_INVALID)";
case UC_ERR_MAP:
return "Invalid memory mapping (UC_ERR_MAP)";
case UC_ERR_WRITE_PROT:
return "Write to write-protected memory (UC_ERR_WRITE_PROT)";
case UC_ERR_READ_PROT:
return "Read from non-readable memory (UC_ERR_READ_PROT)";
case UC_ERR_FETCH_PROT:
return "Fetch from non-executable memory (UC_ERR_FETCH_PROT)";
case UC_ERR_ARG:
return "Invalid argument (UC_ERR_ARG)";
case UC_ERR_READ_UNALIGNED:
return "Read from unaligned memory (UC_ERR_READ_UNALIGNED)";
case UC_ERR_WRITE_UNALIGNED:
return "Write to unaligned memory (UC_ERR_WRITE_UNALIGNED)";
case UC_ERR_FETCH_UNALIGNED:
return "Fetch from unaligned memory (UC_ERR_FETCH_UNALIGNED)";
case UC_ERR_RESOURCE:
return "Insufficient resource (UC_ERR_RESOURCE)";
case UC_ERR_EXCEPTION:
return "Unhandled CPU exception (UC_ERR_EXCEPTION)";
case UC_ERR_OVERFLOW:
return "Provided buffer is too small (UC_ERR_OVERFLOW)";
}
}
UNICORN_EXPORT
bool uc_arch_supported(uc_arch arch)
{
switch (arch) {
#ifdef UNICORN_HAS_ARM
case UC_ARCH_ARM:
return true;
#endif
#ifdef UNICORN_HAS_ARM64
case UC_ARCH_ARM64:
return true;
#endif
#ifdef UNICORN_HAS_M68K
case UC_ARCH_M68K:
return true;
#endif
#ifdef UNICORN_HAS_MIPS
case UC_ARCH_MIPS:
return true;
#endif
#ifdef UNICORN_HAS_PPC
case UC_ARCH_PPC:
return true;
#endif
#ifdef UNICORN_HAS_SPARC
case UC_ARCH_SPARC:
return true;
#endif
#ifdef UNICORN_HAS_X86
case UC_ARCH_X86:
return true;
#endif
#ifdef UNICORN_HAS_RISCV
case UC_ARCH_RISCV:
return true;
#endif
#ifdef UNICORN_HAS_S390X
case UC_ARCH_S390X:
return true;
#endif
#ifdef UNICORN_HAS_TRICORE
case UC_ARCH_TRICORE:
return true;
#endif
/* Invalid or disabled arch */
default:
return false;
}
}
#define UC_INIT(uc) \
save_jit_state(uc); \
if (unlikely(!(uc)->init_done)) { \
int __init_ret = uc_init_engine(uc); \
if (unlikely(__init_ret != UC_ERR_OK)) { \
return __init_ret; \
} \
}
static gint uc_exits_cmp(gconstpointer a, gconstpointer b, gpointer user_data)
{
uint64_t lhs = *((uint64_t *)a);
uint64_t rhs = *((uint64_t *)b);
if (lhs < rhs) {
return -1;
} else if (lhs == rhs) {
return 0;
} else {
return 1;
}
}
static uc_err uc_init_engine(uc_engine *uc)
{
if (uc->init_done) {
return UC_ERR_HANDLE;
}
uc->hooks_to_del.delete_fn = hook_delete;
for (int i = 0; i < UC_HOOK_MAX; i++) {
uc->hook[i].delete_fn = hook_delete;
}
uc->ctl_exits = g_tree_new_full(uc_exits_cmp, NULL, g_free, NULL);
if (machine_initialize(uc)) {
return UC_ERR_RESOURCE;
}
// init tlb function
if (!uc->cpu->cc->tlb_fill) {
uc->set_tlb(uc, UC_TLB_CPU);
}
// init fpu softfloat
uc->softfloat_initialize();
if (uc->reg_reset) {
uc->reg_reset(uc);
}
uc->context_content = UC_CTL_CONTEXT_CPU;
uc->unmapped_regions = g_array_new(false, false, sizeof(MemoryRegion *));
uc->init_done = true;
return UC_ERR_OK;
}
UNICORN_EXPORT
uc_err uc_open(uc_arch arch, uc_mode mode, uc_engine **result)
{
struct uc_struct *uc;
if (arch < UC_ARCH_MAX) {
uc = calloc(1, sizeof(*uc));
if (!uc) {
// memory insufficient
return UC_ERR_NOMEM;
}
/* qemu/exec.c: phys_map_node_reserve() */
uc->alloc_hint = 16;
uc->errnum = UC_ERR_OK;
uc->arch = arch;
uc->mode = mode;
uc->reg_read = default_reg_read;
uc->reg_write = default_reg_write;
// uc->ram_list = { .blocks = QLIST_HEAD_INITIALIZER(ram_list.blocks) };
QLIST_INIT(&uc->ram_list.blocks);
QTAILQ_INIT(&uc->memory_listeners);
QTAILQ_INIT(&uc->address_spaces);
switch (arch) {
default:
break;
#ifdef UNICORN_HAS_M68K
case UC_ARCH_M68K:
if ((mode & ~UC_MODE_M68K_MASK) || !(mode & UC_MODE_BIG_ENDIAN)) {
free(uc);
return UC_ERR_MODE;
}
uc->init_arch = uc_init_m68k;
break;
#endif
#ifdef UNICORN_HAS_X86
case UC_ARCH_X86:
if ((mode & ~UC_MODE_X86_MASK) || (mode & UC_MODE_BIG_ENDIAN) ||
!(mode & (UC_MODE_16 | UC_MODE_32 | UC_MODE_64))) {
free(uc);
return UC_ERR_MODE;
}
uc->init_arch = uc_init_x86_64;
break;
#endif
#ifdef UNICORN_HAS_ARM
case UC_ARCH_ARM:
if ((mode & ~UC_MODE_ARM_MASK)) {
free(uc);
return UC_ERR_MODE;
}
uc->init_arch = uc_init_arm;
if (mode & UC_MODE_THUMB) {
uc->thumb = 1;
}
break;
#endif
#ifdef UNICORN_HAS_ARM64
case UC_ARCH_ARM64:
if (mode & ~UC_MODE_ARM_MASK) {
free(uc);
return UC_ERR_MODE;
}
uc->init_arch = uc_init_aarch64;
break;
#endif
#if defined(UNICORN_HAS_MIPS) || defined(UNICORN_HAS_MIPSEL) || \
defined(UNICORN_HAS_MIPS64) || defined(UNICORN_HAS_MIPS64EL)
case UC_ARCH_MIPS:
if ((mode & ~UC_MODE_MIPS_MASK) ||
!(mode & (UC_MODE_MIPS32 | UC_MODE_MIPS64))) {
free(uc);
return UC_ERR_MODE;
}
if (mode & UC_MODE_BIG_ENDIAN) {
#ifdef UNICORN_HAS_MIPS
if (mode & UC_MODE_MIPS32) {
uc->init_arch = uc_init_mips;
}
#endif
#ifdef UNICORN_HAS_MIPS64
if (mode & UC_MODE_MIPS64) {
uc->init_arch = uc_init_mips64;
}
#endif
} else { // little endian
#ifdef UNICORN_HAS_MIPSEL
if (mode & UC_MODE_MIPS32) {
uc->init_arch = uc_init_mipsel;
}
#endif
#ifdef UNICORN_HAS_MIPS64EL
if (mode & UC_MODE_MIPS64) {
uc->init_arch = uc_init_mips64el;
}
#endif
}
break;
#endif
#ifdef UNICORN_HAS_SPARC
case UC_ARCH_SPARC:
if ((mode & ~UC_MODE_SPARC_MASK) || !(mode & UC_MODE_BIG_ENDIAN) ||
!(mode & (UC_MODE_SPARC32 | UC_MODE_SPARC64))) {
free(uc);
return UC_ERR_MODE;
}
if (mode & UC_MODE_SPARC64) {
uc->init_arch = uc_init_sparc64;
} else {
uc->init_arch = uc_init_sparc;
}
break;
#endif
#ifdef UNICORN_HAS_PPC
case UC_ARCH_PPC:
if ((mode & ~UC_MODE_PPC_MASK) || !(mode & UC_MODE_BIG_ENDIAN) ||
!(mode & (UC_MODE_PPC32 | UC_MODE_PPC64))) {
free(uc);
return UC_ERR_MODE;
}
if (mode & UC_MODE_PPC64) {
uc->init_arch = uc_init_ppc64;
} else {
uc->init_arch = uc_init_ppc;
}
break;
#endif
#ifdef UNICORN_HAS_RISCV
case UC_ARCH_RISCV:
if ((mode & ~UC_MODE_RISCV_MASK) ||
!(mode & (UC_MODE_RISCV32 | UC_MODE_RISCV64))) {
free(uc);
return UC_ERR_MODE;
}
if (mode & UC_MODE_RISCV32) {
uc->init_arch = uc_init_riscv32;
} else if (mode & UC_MODE_RISCV64) {
uc->init_arch = uc_init_riscv64;
} else {
free(uc);
return UC_ERR_MODE;
}
break;
#endif
#ifdef UNICORN_HAS_S390X
case UC_ARCH_S390X:
if ((mode & ~UC_MODE_S390X_MASK) || !(mode & UC_MODE_BIG_ENDIAN)) {
free(uc);
return UC_ERR_MODE;
}
uc->init_arch = uc_init_s390x;
break;
#endif
#ifdef UNICORN_HAS_TRICORE
case UC_ARCH_TRICORE:
if ((mode & ~UC_MODE_TRICORE_MASK)) {
free(uc);
return UC_ERR_MODE;
}
uc->init_arch = uc_init_tricore;
break;
#endif
}
if (uc->init_arch == NULL) {
free(uc);
return UC_ERR_ARCH;
}
uc->init_done = false;
uc->cpu_model = INT_MAX; // INT_MAX means the default cpu model.
*result = uc;
return UC_ERR_OK;
} else {
return UC_ERR_ARCH;
}
}
UNICORN_EXPORT
uc_err uc_close(uc_engine *uc)
{
int i;
MemoryRegion *mr;
if (!uc->init_done) {
free(uc);
return UC_ERR_OK;
}
// Cleanup internally.
if (uc->release) {
uc->release(uc->tcg_ctx);
}
g_free(uc->tcg_ctx);
// Cleanup CPU.
g_free(uc->cpu->cpu_ases);
g_free(uc->cpu->thread);
/* cpu */
qemu_vfree(uc->cpu);
/* flatviews */
g_hash_table_destroy(uc->flat_views);
// During flatviews destruction, we may still access memory regions.
// So we free them afterwards.
/* memory */
mr = &uc->io_mem_unassigned;
mr->destructor(mr);
mr = uc->system_io;
mr->destructor(mr);
mr = uc->system_memory;
mr->destructor(mr);
g_free(uc->system_memory);
g_free(uc->system_io);
for (size_t i = 0; i < uc->unmapped_regions->len; i++) {
mr = g_array_index(uc->unmapped_regions, MemoryRegion *, i);
mr->destructor(mr);
g_free(mr);
}
g_array_free(uc->unmapped_regions, true);
// Thread relateds.
if (uc->qemu_thread_data) {
g_free(uc->qemu_thread_data);
}
/* free */
g_free(uc->init_target_page);
// Other auxilaries.
g_free(uc->l1_map);
if (uc->bounce.buffer) {
qemu_vfree(uc->bounce.buffer);
}
// free hooks and hook lists
clear_deleted_hooks(uc);
for (i = 0; i < UC_HOOK_MAX; i++) {
list_clear(&uc->hook[i]);
}
free(uc->mapped_blocks);
g_tree_destroy(uc->ctl_exits);
// finally, free uc itself.
memset(uc, 0, sizeof(*uc));
free(uc);
return UC_ERR_OK;
}
UNICORN_EXPORT
uc_err uc_reg_read_batch(uc_engine *uc, int *regs, void **vals, int count)
{
UC_INIT(uc);
reg_read_t reg_read = uc->reg_read;
void *env = uc->cpu->env_ptr;
int mode = uc->mode;
int i;
for (i = 0; i < count; i++) {
unsigned int regid = regs[i];
void *value = vals[i];
size_t size = (size_t)-1;
uc_err err = reg_read(env, mode, regid, value, &size);
if (err) {
restore_jit_state(uc);
return err;
}
}
restore_jit_state(uc);
return UC_ERR_OK;
}
UNICORN_EXPORT
uc_err uc_reg_write_batch(uc_engine *uc, int *regs, void *const *vals,
int count)
{
UC_INIT(uc);
reg_write_t reg_write = uc->reg_write;
void *env = uc->cpu->env_ptr;
int mode = uc->mode;
int setpc = 0;
int i;
for (i = 0; i < count; i++) {
unsigned int regid = regs[i];
const void *value = vals[i];
size_t size = (size_t)-1;
uc_err err = reg_write(env, mode, regid, value, &size, &setpc);
if (err) {
restore_jit_state(uc);
return err;
}
}
if (setpc) {
// force to quit execution and flush TB
uc->quit_request = true;
break_translation_loop(uc);
}
restore_jit_state(uc);
return UC_ERR_OK;
}
UNICORN_EXPORT
uc_err uc_reg_read_batch2(uc_engine *uc, int *regs, void *const *vals,
size_t *sizes, int count)
{
UC_INIT(uc);
reg_read_t reg_read = uc->reg_read;
void *env = uc->cpu->env_ptr;
int mode = uc->mode;
int i;
for (i = 0; i < count; i++) {
unsigned int regid = regs[i];
void *value = vals[i];
uc_err err = reg_read(env, mode, regid, value, sizes + i);
if (err) {
restore_jit_state(uc);
return err;
}
}
restore_jit_state(uc);
return UC_ERR_OK;
}
UNICORN_EXPORT
uc_err uc_reg_write_batch2(uc_engine *uc, int *regs, const void *const *vals,
size_t *sizes, int count)
{
UC_INIT(uc);
reg_write_t reg_write = uc->reg_write;
void *env = uc->cpu->env_ptr;
int mode = uc->mode;
int setpc = 0;
int i;
for (i = 0; i < count; i++) {
unsigned int regid = regs[i];
const void *value = vals[i];
uc_err err = reg_write(env, mode, regid, value, sizes + i, &setpc);
if (err) {
restore_jit_state(uc);
return err;
}
}
if (setpc) {
// force to quit execution and flush TB
uc->quit_request = true;
break_translation_loop(uc);
}
restore_jit_state(uc);
return UC_ERR_OK;
}
UNICORN_EXPORT
uc_err uc_reg_read(uc_engine *uc, int regid, void *value)
{
UC_INIT(uc);
size_t size = (size_t)-1;
uc_err err = uc->reg_read(uc->cpu->env_ptr, uc->mode, regid, value, &size);
restore_jit_state(uc);
return err;
}
UNICORN_EXPORT
uc_err uc_reg_write(uc_engine *uc, int regid, const void *value)
{
UC_INIT(uc);
int setpc = 0;
size_t size = (size_t)-1;
uc_err err =
uc->reg_write(uc->cpu->env_ptr, uc->mode, regid, value, &size, &setpc);
if (err) {
restore_jit_state(uc);
return err;
}
if (setpc) {
// force to quit execution and flush TB
uc->quit_request = true;
break_translation_loop(uc);
}
restore_jit_state(uc);
return UC_ERR_OK;
}
UNICORN_EXPORT
uc_err uc_reg_read2(uc_engine *uc, int regid, void *value, size_t *size)
{
UC_INIT(uc);
uc_err err = uc->reg_read(uc->cpu->env_ptr, uc->mode, regid, value, size);
restore_jit_state(uc);
return err;
}
UNICORN_EXPORT
uc_err uc_reg_write2(uc_engine *uc, int regid, const void *value, size_t *size)
{
UC_INIT(uc);
int setpc = 0;
uc_err err =
uc->reg_write(uc->cpu->env_ptr, uc->mode, regid, value, size, &setpc);
if (err) {
restore_jit_state(uc);
return err;
}
if (setpc) {
// force to quit execution and flush TB
uc->quit_request = true;
break_translation_loop(uc);
}
restore_jit_state(uc);
return UC_ERR_OK;
}
static size_t memory_region_len(uc_engine *uc, MemoryRegion *mr,
uint64_t address, size_t count)
{
hwaddr end = mr->end;
while (mr->container != uc->system_memory) {
mr = mr->container;
end += mr->addr;
}
return (size_t)MIN(count, end - address);
}
// check if a memory area is mapped
// this is complicated because an area can overlap adjacent blocks
static bool check_mem_area(uc_engine *uc, uint64_t address, size_t size)
{
size_t count = 0, len;
while (count < size) {
MemoryRegion *mr = uc->memory_mapping(uc, address);
if (mr) {
len = memory_region_len(uc, mr, address, size - count);
count += len;
address += len;
} else { // this address is not mapped in yet
break;
}
}
return (count == size);
}
UNICORN_EXPORT
uc_err uc_mem_read(uc_engine *uc, uint64_t address, void *_bytes, size_t size)
{
size_t count = 0, len;
uint8_t *bytes = _bytes;
UC_INIT(uc);
// qemu cpu_physical_memory_rw() size is an int
if (size > INT_MAX) {
restore_jit_state(uc);
return UC_ERR_ARG;
}
if (!check_mem_area(uc, address, size)) {
restore_jit_state(uc);
return UC_ERR_READ_UNMAPPED;
}
// memory area can overlap adjacent memory blocks
while (count < size) {
MemoryRegion *mr = uc->memory_mapping(uc, address);
if (mr) {
len = memory_region_len(uc, mr, address, size - count);
if (uc->read_mem(&uc->address_space_memory, address, bytes, len) ==
false) {
break;
}
count += len;
address += len;
bytes += len;
} else { // this address is not mapped in yet
break;
}
}
if (count == size) {
restore_jit_state(uc);
return UC_ERR_OK;
} else {
restore_jit_state(uc);
return UC_ERR_READ_UNMAPPED;
}
}
UNICORN_EXPORT
uc_err uc_mem_write(uc_engine *uc, uint64_t address, const void *_bytes,
size_t size)
{
size_t count = 0, len;
const uint8_t *bytes = _bytes;
UC_INIT(uc);
// qemu cpu_physical_memory_rw() size is an int
if (size > INT_MAX) {
restore_jit_state(uc);
return UC_ERR_ARG;
}
if (!check_mem_area(uc, address, size)) {
restore_jit_state(uc);
return UC_ERR_WRITE_UNMAPPED;
}
// memory area can overlap adjacent memory blocks
while (count < size) {
MemoryRegion *mr = uc->memory_mapping(uc, address);
if (mr) {
uint32_t operms = mr->perms;
uint64_t align = uc->target_page_align;
if (!(operms & UC_PROT_WRITE)) { // write protected
// but this is not the program accessing memory, so temporarily
// mark writable
uc->readonly_mem(mr, false);
}
len = memory_region_len(uc, mr, address, size - count);
if (uc->snapshot_level && uc->snapshot_level > mr->priority) {
mr = uc->memory_cow(uc, mr, address & ~align,
(len + (address & align) + align) & ~align);
if (!mr) {
return UC_ERR_NOMEM;
}
}
if (uc->write_mem(&uc->address_space_memory, address, bytes, len) ==
false) {
break;
}
if (!(operms & UC_PROT_WRITE)) { // write protected
// now write protect it again
uc->readonly_mem(mr, true);
}
count += len;
address += len;
bytes += len;
} else { // this address is not mapped in yet
break;
}
}
if (count == size) {
restore_jit_state(uc);
return UC_ERR_OK;
} else {
restore_jit_state(uc);
return UC_ERR_WRITE_UNMAPPED;
}
}
#define TIMEOUT_STEP 2 // microseconds
static void *_timeout_fn(void *arg)
{
struct uc_struct *uc = arg;
int64_t current_time = get_clock();
do {
usleep(TIMEOUT_STEP);
// perhaps emulation is even done before timeout?
if (uc->emulation_done) {
break;
}
} while ((uint64_t)(get_clock() - current_time) < uc->timeout);
// timeout before emulation is done?
if (!uc->emulation_done) {
uc->timed_out = true;
// force emulation to stop
uc_emu_stop(uc);
}
return NULL;
}
static void enable_emu_timer(uc_engine *uc, uint64_t timeout)
{
uc->timeout = timeout;
qemu_thread_create(uc, &uc->timer, "timeout", _timeout_fn, uc,
QEMU_THREAD_JOINABLE);
}
static void hook_count_cb(struct uc_struct *uc, uint64_t address, uint32_t size,
void *user_data)
{
// count this instruction. ah ah ah.
uc->emu_counter++;
// printf(":: emu counter = %u, at %lx\n", uc->emu_counter, address);
if (uc->emu_counter > uc->emu_count) {
// printf(":: emu counter = %u, stop emulation\n", uc->emu_counter);
uc_emu_stop(uc);
}
}
static void clear_deleted_hooks(uc_engine *uc)
{
struct list_item *cur;
struct hook *hook;
int i;
for (cur = uc->hooks_to_del.head;
cur != NULL && (hook = (struct hook *)cur->data); cur = cur->next) {
assert(hook->to_delete);
for (i = 0; i < UC_HOOK_MAX; i++) {
if (list_remove(&uc->hook[i], (void *)hook)) {
break;
}
}
}
list_clear(&uc->hooks_to_del);
}
UNICORN_EXPORT
uc_err uc_emu_start(uc_engine *uc, uint64_t begin, uint64_t until,
uint64_t timeout, size_t count)
{
uc_err err;
// reset the counter
uc->emu_counter = 0;
uc->invalid_error = UC_ERR_OK;
uc->emulation_done = false;
uc->size_recur_mem = 0;
uc->timed_out = false;
uc->first_tb = true;
// Avoid nested uc_emu_start saves wrong jit states.
if (uc->nested_level == 0) {
UC_INIT(uc);
}
// Advance the nested levels. We must decrease the level count by one when
// we return from uc_emu_start.
if (uc->nested_level >= UC_MAX_NESTED_LEVEL) {
// We can't support so many nested levels.
return UC_ERR_RESOURCE;
}
uc->nested_level++;
uint32_t begin_pc32 = READ_DWORD(begin);
switch (uc->arch) {
default:
break;
#ifdef UNICORN_HAS_M68K
case UC_ARCH_M68K:
uc_reg_write(uc, UC_M68K_REG_PC, &begin_pc32);
break;
#endif
#ifdef UNICORN_HAS_X86
case UC_ARCH_X86:
switch (uc->mode) {
default:
break;
case UC_MODE_16: {
uint16_t ip;
uint16_t cs;
uc_reg_read(uc, UC_X86_REG_CS, &cs);
// compensate for later adding up IP & CS
ip = begin - cs * 16;
uc_reg_write(uc, UC_X86_REG_IP, &ip);
break;