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unicorn.c
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/*
Ruby bindings for the Unicorn Emulator Engine
Copyright(c) 2016 Sascha Schirra
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.
*/
#include "ruby.h"
#include <unicorn/unicorn.h>
#include <unicorn/x86.h>
#include "unicorn.h"
#include "types.h"
VALUE UnicornModule = Qnil;
VALUE UcClass = Qnil;
VALUE UcError = Qnil;
VALUE SavedContext = Qnil;
VALUE Hook = Qnil;
void Init_unicorn_engine() {
rb_require("unicorn_engine/unicorn_const");
UnicornModule = rb_define_module("UnicornEngine");
UcError = rb_define_class_under(UnicornModule, "UcError", rb_eStandardError);
SavedContext = rb_define_class_under(UnicornModule, "SavedContext", rb_cObject);
Hook = rb_define_class_under(UnicornModule, "Hook", rb_cObject);
UcClass = rb_define_class_under(UnicornModule, "Uc", rb_cObject);
rb_define_method(UcClass, "initialize", m_uc_initialize, 2);
rb_define_method(UcClass, "emu_start", m_uc_emu_start, -1);
rb_define_method(UcClass, "emu_stop", m_uc_emu_stop, 0);
rb_define_method(UcClass, "reg_read", m_uc_reg_read, 1);
rb_define_method(UcClass, "reg_write", m_uc_reg_write, 2);
rb_define_method(UcClass, "mem_read", m_uc_mem_read, 2);
rb_define_method(UcClass, "mem_write", m_uc_mem_write, 2);
rb_define_method(UcClass, "mem_map", m_uc_mem_map, -1);
rb_define_method(UcClass, "mem_unmap", m_uc_mem_unmap, 2);
rb_define_method(UcClass, "mem_protect", m_uc_mem_protect, 3);
rb_define_method(UcClass, "hook_add", m_uc_hook_add, -1);
rb_define_method(UcClass, "hook_del", m_uc_hook_del, 1);
rb_define_method(UcClass, "query", m_uc_query, 1);
rb_define_method(UcClass, "context_save", m_uc_context_save, 0);
rb_define_method(UcClass, "context_update", m_uc_context_update, 1);
rb_define_method(UcClass, "context_restore", m_uc_context_restore, 1);
}
VALUE m_uc_initialize(VALUE self, VALUE arch, VALUE mode) {
uc_engine *_uc;
uc_err err;
err = uc_open(NUM2INT(arch), NUM2INT(mode), &_uc);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
VALUE uc = Data_Wrap_Struct(UcClass, 0, uc_close, _uc);
rb_iv_set(self, "@uch", uc);
rb_iv_set(self, "@hooks", rb_ary_new());
return self;
}
VALUE m_uc_emu_start(int argc, VALUE* argv, VALUE self){
VALUE begin;
VALUE until;
VALUE timeout;
VALUE count;
uc_err err;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self,"@uch"), uc_engine, _uc);
rb_scan_args(argc, argv, "22",&begin, &until, &timeout, &count);
if (NIL_P(timeout))
timeout = INT2NUM(0);
if (NIL_P(count))
count = INT2NUM(0);
err = uc_emu_start(_uc, NUM2ULL(begin), NUM2ULL(until), NUM2INT(timeout), NUM2INT(count));
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return Qnil;
}
VALUE m_uc_emu_stop(VALUE self){
uc_err err;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self,"@uch"), uc_engine, _uc);
err = uc_emu_stop(_uc);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return Qnil;
}
VALUE m_uc_reg_read(VALUE self, VALUE reg_id){
uc_err err;
int32_t tmp_reg = NUM2INT(reg_id);
int64_t reg_value = 0;
VALUE to_ret;
uc_x86_mmr mmr;
uc_x86_float80 float80;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self,"@uch"), uc_engine, _uc);
uc_arch arch;
uc_query(_uc, UC_QUERY_ARCH, &arch);
if(arch == UC_ARCH_X86) {
switch(tmp_reg){
case UC_X86_REG_GDTR:
case UC_X86_REG_IDTR:
case UC_X86_REG_LDTR:
case UC_X86_REG_TR:
mmr.selector = 0;
mmr.base = 0;
mmr.limit = 0;
mmr.flags = 0;
err = uc_reg_read(_uc, tmp_reg, &mmr);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
VALUE mmr_ary = rb_ary_new();
reg_value = mmr.selector;
rb_ary_store(mmr_ary, 0, UINT2NUM(reg_value));
rb_ary_store(mmr_ary, 1, ULL2NUM(mmr.base));
rb_ary_store(mmr_ary, 2, UINT2NUM(mmr.limit));
rb_ary_store(mmr_ary, 3, UINT2NUM(mmr.flags));
return mmr_ary;
case UC_X86_REG_FP0:
case UC_X86_REG_FP1:
case UC_X86_REG_FP2:
case UC_X86_REG_FP3:
case UC_X86_REG_FP4:
case UC_X86_REG_FP5:
case UC_X86_REG_FP6:
case UC_X86_REG_FP7:
float80.mantissa = 0;
float80.exponent = 0;
err = uc_reg_read(_uc, tmp_reg, &float80);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
VALUE float80_ary = rb_ary_new();
rb_ary_store(float80_ary, 0, ULL2NUM(float80.mantissa));
rb_ary_store(float80_ary, 1, UINT2NUM(float80.exponent));
return float80_ary;
}
}
if(arch == UC_ARCH_ARM64) {
// V & Q registers are the same
if(tmp_reg >= UC_ARM64_REG_V0 && tmp_reg <= UC_ARM64_REG_V31) {
tmp_reg += UC_ARM64_REG_Q0 - UC_ARM64_REG_V0;
}
if(tmp_reg >= UC_ARM64_REG_Q0 && tmp_reg <= UC_ARM64_REG_Q31) {
uint64_t neon128_value[2];
err = uc_reg_read(_uc, tmp_reg, &neon128_value);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
VALUE float128_ary = rb_ary_new();
rb_ary_store(float128_ary, 0, ULL2NUM(neon128_value[0]));
rb_ary_store(float128_ary, 1, ULL2NUM(neon128_value[1]));
return float128_ary;
}
}
err = uc_reg_read(_uc, tmp_reg, ®_value);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return ULL2NUM(reg_value);
}
VALUE m_uc_reg_write(VALUE self, VALUE reg_id, VALUE reg_value){
uc_err err;
int32_t tmp_reg = NUM2INT(reg_id);
uc_x86_mmr mmr;
uc_x86_float80 float80;
int64_t tmp;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self,"@uch"), uc_engine, _uc);
uc_arch arch;
uc_query(_uc, UC_QUERY_ARCH, &arch);
if(arch == UC_ARCH_X86) {
switch(tmp_reg){
case UC_X86_REG_GDTR:
case UC_X86_REG_IDTR:
case UC_X86_REG_LDTR:
case UC_X86_REG_TR:
Check_Type(reg_value, T_ARRAY);
mmr.selector = NUM2USHORT(rb_ary_entry(reg_value,0));
mmr.base = NUM2ULL(rb_ary_entry(reg_value,1));
mmr.limit = NUM2UINT(rb_ary_entry(reg_value,2));
mmr.flags = NUM2UINT(rb_ary_entry(reg_value,3));
err = uc_reg_write(_uc, tmp_reg, &mmr);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return Qnil;
case UC_X86_REG_FP0:
case UC_X86_REG_FP1:
case UC_X86_REG_FP2:
case UC_X86_REG_FP3:
case UC_X86_REG_FP4:
case UC_X86_REG_FP5:
case UC_X86_REG_FP6:
case UC_X86_REG_FP7:
Check_Type(reg_value, T_ARRAY);
float80.mantissa = NUM2ULL(rb_ary_entry(reg_value,0));
float80.exponent = NUM2USHORT(rb_ary_entry(reg_value,1));
err = uc_reg_write(_uc, tmp_reg, &float80);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return Qnil;
}
}
if(arch == UC_ARCH_ARM64) {
// V & Q registers are the same
if(tmp_reg >= UC_ARM64_REG_V0 && tmp_reg <= UC_ARM64_REG_V31) {
tmp_reg += UC_ARM64_REG_Q0 - UC_ARM64_REG_V0;
}
if(tmp_reg >= UC_ARM64_REG_Q0 && tmp_reg <= UC_ARM64_REG_Q31) {
Check_Type(reg_value, T_ARRAY);
uint64_t neon128_value[2];
neon128_value[0] = NUM2ULL(rb_ary_entry(reg_value, 0));
neon128_value[1] = NUM2ULL(rb_ary_entry(reg_value, 1));
err = uc_reg_write(_uc, NUM2INT(reg_id), &neon128_value);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return Qnil;
}
}
tmp = NUM2ULL(reg_value);
err = uc_reg_write(_uc, NUM2INT(reg_id), &tmp);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return Qnil;
}
VALUE m_uc_mem_read(VALUE self, VALUE address, VALUE size){
size_t isize = NUM2UINT(size);
uint8_t bytes[isize];
uc_err err;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self,"@uch"), uc_engine, _uc);
err = uc_mem_read(_uc, NUM2ULL(address), &bytes, isize);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return rb_str_new(bytes, isize);
}
VALUE m_uc_mem_write(VALUE self, VALUE address, VALUE bytes){
uc_err err;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self,"@uch"), uc_engine, _uc);
err = uc_mem_write(_uc, NUM2ULL(address), StringValuePtr(bytes), RSTRING_LEN(bytes));
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return Qnil;
}
VALUE m_uc_mem_map(int argc, VALUE* argv, VALUE self){
uc_err err;
VALUE address;
VALUE size;
VALUE perms;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self,"@uch"), uc_engine, _uc);
rb_scan_args(argc, argv, "21",&address, &size, &perms);
if (NIL_P(perms))
perms = INT2NUM(UC_PROT_ALL);
err = uc_mem_map(_uc, NUM2ULL(address), NUM2UINT(size), NUM2UINT(perms));
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return Qnil;
}
VALUE m_uc_mem_unmap(VALUE self, VALUE address, VALUE size){
uc_err err;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self, "@uch"), uc_engine, _uc);
err = uc_mem_unmap(_uc, NUM2ULL(address), NUM2UINT(size));
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return Qnil;
}
VALUE m_uc_mem_protect(VALUE self, VALUE address, VALUE size, VALUE perms){
uc_err err;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self,"@uch"), uc_engine, _uc);
err = uc_mem_protect(_uc, NUM2ULL(address), NUM2UINT(size), NUM2UINT(perms));
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return Qnil;
}
static void cb_hook_code(uc_engine *uc, uint64_t address, uint32_t size, void *user_data){
struct hook *hook = (struct hook *)user_data;
VALUE cb;
VALUE ud;
VALUE rUc;
cb = hook->cb;
ud = hook->ud;
rUc = hook->rUc;
rb_funcall(cb, rb_intern("call"), 4, rUc, ULL2NUM(address), UINT2NUM(size), ud);
}
static void cb_hook_mem_access(uc_engine *uc, uint32_t access, uint64_t address, uint32_t size, int64_t value, void *user_data){
struct hook *hook = (struct hook *)user_data;
VALUE cb;
VALUE ud;
VALUE rUc;
cb = hook->cb;
ud = hook->ud;
rUc = hook->rUc;
rb_funcall(cb, rb_intern("call"), 6, rUc, UINT2NUM(access), ULL2NUM(address), UINT2NUM(size), LL2NUM(value), ud);
}
static bool cb_hook_mem_invalid(uc_engine *uc, uint32_t access, uint64_t address, uint32_t size, int64_t value, void *user_data){
struct hook *hook = (struct hook *)user_data;
VALUE cb;
VALUE ud;
VALUE rUc;
cb = hook->cb;
ud = hook->ud;
rUc = hook->rUc;
return RTEST(rb_funcall(cb, rb_intern("call"), 6, rUc, UINT2NUM(access), ULL2NUM(address), UINT2NUM(size), LL2NUM(value), ud));
}
static uint32_t cb_hook_insn_in(uc_engine *uc, uint32_t port, int size, void *user_data){
struct hook *hook = (struct hook *)user_data;
VALUE cb;
VALUE ud;
VALUE rUc;
cb = hook->cb;
ud = hook->ud;
rUc = hook->rUc;
return NUM2UINT(rb_funcall(cb, rb_intern("call"), 4, rUc, UINT2NUM(port), INT2NUM(size), ud));
}
static void cb_hook_insn_out(uc_engine *uc, uint32_t port, int size, uint32_t value, void *user_data){
struct hook *hook = (struct hook *)user_data;
VALUE cb;
VALUE ud;
VALUE rUc;
cb = hook->cb;
ud = hook->ud;
rUc = hook->rUc;
rb_funcall(cb, rb_intern("call"), 5, rUc, UINT2NUM(port), INT2NUM(size), UINT2NUM(value), ud);
}
static void cb_hook_insn_syscall(uc_engine *uc, void *user_data){
struct hook *hook = (struct hook *)user_data;
VALUE cb;
VALUE ud;
VALUE rUc;
cb = hook->cb;
ud = hook->ud;
rUc = hook->rUc;
rb_funcall(cb, rb_intern("call"), 2, rUc, ud);
}
static void cb_hook_intr(uc_engine *uc, uint32_t intno, void *user_data){
struct hook *hook = (struct hook *)user_data;
VALUE cb;
VALUE ud;
VALUE rUc;
cb = hook->cb;
ud = hook->ud;
rUc = hook->rUc;
rb_funcall(cb, rb_intern("call"), 3, rUc, ULL2NUM(intno), ud);
}
static void mark_hook(void *p){
struct hook *hook = (struct hook *)p;
rb_gc_mark(hook->cb);
rb_gc_mark(hook->ud);
rb_gc_mark(hook->rUc); // just for completeness sake even though this should already be marked
}
VALUE m_uc_hook_add(int argc, VALUE* argv, VALUE self){
VALUE hook_type;
VALUE callback;
VALUE user_data;
VALUE begin;
VALUE end;
VALUE arg1;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self, "@uch"), uc_engine, _uc);
rb_scan_args(argc, argv, "24",&hook_type, &callback, &user_data, &begin, &end, &arg1);
if (NIL_P(begin))
begin = ULL2NUM(1);
if (NIL_P(end))
end = ULL2NUM(0);
if (NIL_P(arg1))
arg1 = INT2NUM(0);
uc_err err;
if (rb_class_of(callback) != rb_cProc)
rb_raise(UcError, "Expected Proc callback");
struct hook *hook = (struct hook *)malloc(sizeof(struct hook));
hook->cb = callback;
hook->ud = user_data;
hook->rUc = self;
VALUE r_hook;
VALUE hooks_list;
r_hook = Data_Wrap_Struct(Hook, mark_hook, free, hook);
hooks_list = rb_iv_get(self, "@hooks");
rb_ary_push(hooks_list, r_hook);
uint32_t htype = NUM2UINT(hook_type);
if(htype == UC_HOOK_INSN){
switch(NUM2INT(arg1)){
case UC_X86_INS_IN:
err = uc_hook_add(_uc, &hook->trace, htype, cb_hook_insn_in,(void *)hook, NUM2ULL(begin), NUM2ULL(end), NUM2INT(arg1));
break;
case UC_X86_INS_OUT:
err = uc_hook_add(_uc, &hook->trace, htype, cb_hook_insn_out,(void *)hook, NUM2ULL(begin), NUM2ULL(end), NUM2INT(arg1));
break;
case UC_X86_INS_SYSCALL:
case UC_X86_INS_SYSENTER:
err = uc_hook_add(_uc, &hook->trace, htype, cb_hook_insn_syscall,(void *)hook, NUM2ULL(begin), NUM2ULL(end), NUM2INT(arg1));
break;
}
}
else if(htype == UC_HOOK_INTR){
err = uc_hook_add(_uc, &hook->trace, htype, cb_hook_intr,(void *)hook, NUM2ULL(begin), NUM2ULL(end));
}
else if(htype == UC_HOOK_CODE || htype == UC_HOOK_BLOCK){
err = uc_hook_add(_uc, &hook->trace, htype, cb_hook_code,(void *)hook, NUM2ULL(begin), NUM2ULL(end));
}
else if (htype & UC_HOOK_MEM_READ_UNMAPPED
|| htype & UC_HOOK_MEM_WRITE_UNMAPPED
|| htype & UC_HOOK_MEM_FETCH_UNMAPPED
|| htype & UC_HOOK_MEM_READ_PROT
|| htype & UC_HOOK_MEM_WRITE_PROT
|| htype & UC_HOOK_MEM_FETCH_PROT
|| htype & UC_HOOK_MEM_READ_INVALID
|| htype & UC_HOOK_MEM_WRITE_INVALID
|| htype & UC_HOOK_MEM_FETCH_INVALID
|| htype & UC_HOOK_MEM_UNMAPPED
|| htype & UC_HOOK_MEM_PROT
|| htype & UC_HOOK_MEM_INVALID) {
err = uc_hook_add(_uc, &hook->trace, htype, cb_hook_mem_invalid,(void *)hook, NUM2ULL(begin), NUM2ULL(end));
}
else{
err = uc_hook_add(_uc, &hook->trace, htype, cb_hook_mem_access,(void *)hook, NUM2ULL(begin), NUM2ULL(end));
}
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return r_hook;
}
VALUE m_uc_hook_del(VALUE self, VALUE hook){
uc_err err;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self,"@uch"), uc_engine, _uc);
struct hook *h;
Data_Get_Struct(hook, struct hook, h);
err = uc_hook_del(_uc, h->trace);
rb_ary_delete(rb_iv_get(self, "@hooks"), hook);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return Qnil;
}
VALUE m_uc_query(VALUE self, VALUE query_mode){
int qm = NUM2INT(query_mode);
size_t result;
uc_err err;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self,"@uch"), uc_engine, _uc);
err = uc_query(_uc, qm, &result);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return INT2NUM(result);
}
VALUE m_uc_context_save(VALUE self){
uc_err err;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self,"@uch"), uc_engine, _uc);
uc_context *_context;
err = uc_context_alloc(_uc, &_context);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
err = uc_context_save(_uc, _context);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
VALUE sc = Data_Wrap_Struct(SavedContext, 0, uc_free, _context);
return sc;
}
VALUE m_uc_context_update(VALUE self, VALUE context){
uc_err err;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self,"@uch"), uc_engine, _uc);
uc_context *_context;
Data_Get_Struct(context, uc_context, _context);
err = uc_context_save(_uc, _context);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return Qnil;
}
VALUE m_uc_context_restore(VALUE self, VALUE context){
uc_err err;
uc_engine *_uc;
Data_Get_Struct(rb_iv_get(self,"@uch"), uc_engine, _uc);
uc_context *_context;
Data_Get_Struct(context, uc_context, _context);
err = uc_context_restore(_uc, _context);
if (err != UC_ERR_OK) {
rb_raise(UcError, "%s", uc_strerror(err));
}
return Qnil;
}