static dr_emit_flags_t
event_basic_block(void *drcontext, void *tag, instrlist_t *bb,
bool for_trace, bool translating)
{
int i;
instr_t *instr, *first = instrlist_first(bb);
for (instr = first; instr != NULL; instr = instr_get_next(instr)) {
if (instr_reads_memory(instr)) {
for (i = 0; i < instr_num_srcs(instr); i++) {
if (opnd_is_memory_reference(instr_get_src(instr, i))) {
instrument_mem(drcontext, bb, instr, i, false);
}
}
}
if (instr_writes_memory(instr)) {
for (i = 0; i < instr_num_dsts(instr); i++) {
if (opnd_is_memory_reference(instr_get_dst(instr, i))) {
instrument_mem(drcontext, bb, instr, i, true);
}
}
}
}
// dr_printf("count %d\n",count);
return DR_EMIT_DEFAULT;
}
/* Called by slow_path() after initial decode. Expected to free inst. */
bool
slow_path_for_staleness(void *drcontext, dr_mcontext_t *mc, instr_t *inst,
app_loc_t *loc)
{
opnd_t opnd;
int opc, i, num_srcs, num_dsts;
uint sz;
bool pushpop_stackop;
opc = instr_get_opcode(inst);
num_srcs = num_true_srcs(inst, mc);
for (i = 0; i < num_srcs; i++) {
opnd = instr_get_src(inst, i);
if (opnd_is_memory_reference(opnd)) {
opnd = adjust_memop(inst, opnd, false, &sz, &pushpop_stackop);
check_mem_opnd_nouninit(opc, 0, loc, opnd, sz, mc);
}
}
num_dsts = num_true_dsts(inst, mc);
for (i = 0; i < num_dsts; i++) {
opnd = instr_get_dst(inst, i);
if (opnd_is_memory_reference(opnd)) {
opnd = adjust_memop(inst, opnd, true, &sz, &pushpop_stackop);
check_mem_opnd_nouninit(opc, 0, loc, opnd, sz, mc);
}
}
instr_free(drcontext, inst);
/* we're not sharing xl8 so no need to call slow_path_xl8_sharing */
return true;
}
/* event_bb_insert calls instrument_mem to instrument every
* application memory reference.
*/
dr_emit_flags_t
memtrace_bb_instrumentation(void *drcontext, void *tag, instrlist_t *bb,
instr_t *instr, bool for_trace, bool translating,
void *user_data)
{
int i;
reg_id_t reg;
file_t out_file;
instr_t * first = NULL;
instr_t * current;
//DR_ASSERT(instr_ok_to_mangle(instr));
if (instr_ok_to_mangle(instr)){
/* FIXME - need to generalize the filtering library */
for (current = instrlist_first(bb); current != NULL; current = instr_get_next(current)){
if (instr_ok_to_mangle(current)){
first = current;
break;
}
}
if ((first != NULL) && filter_from_list(head, first, client_arg->filter_mode)){
if (instr_reads_memory(instr)) {
for (i = 0; i < instr_num_srcs(instr); i++) {
if (opnd_is_memory_reference(instr_get_src(instr, i))) {
instrument_mem(drcontext, bb, instr, i, false);
}
}
}
if (instr_writes_memory(instr)) {
for (i = 0; i < instr_num_dsts(instr); i++) {
if (opnd_is_memory_reference(instr_get_dst(instr, i))) {
instrument_mem(drcontext, bb, instr, i, true);
}
}
}
}
}
return DR_EMIT_DEFAULT;
}
void check_opnd(opnd_t opnd, void *pc, int read, void *drcontext,
dr_mcontext_t *mctx, void *prev_pc)
{
if (opnd_is_memory_reference(opnd) && opnd_is_base_disp(opnd))
add_hit(pc, opnd_size_in_bytes(opnd_get_size(opnd)),
opnd_get_disp(opnd) + (void *)reg_get_value(opnd_get_base(opnd),
mctx),
read, drcontext, prev_pc);
else if (opnd_is_memory_reference(opnd) && opnd_get_addr(opnd))
add_hit(pc, opnd_size_in_bytes(opnd_get_size(opnd)), opnd_get_addr(opnd),
read, drcontext, prev_pc);
// for now no other kind of memory reference was noticed to access heap data
else if (opnd_is_memory_reference(opnd))
dr_printf("need to implem other memory ref\n");
}
dr_emit_flags_t
memdump_bb_instrumentation(void *drcontext, void *tag, instrlist_t *bb,
instr_t *instr, bool for_trace, bool translating,
void *user_data)
{
reg_id_t reg1 = DR_REG_XAX;
reg_id_t reg2 = DR_REG_XBX;
int i = 0;
if(filter_bb_level_from_list(app_pc_head, instr)){
dr_save_reg(drcontext, bb, instr, reg1, SPILL_SLOT_1);
dr_save_reg(drcontext, bb, instr, reg2, SPILL_SLOT_2);
dr_mutex_lock(mutex);
DEBUG_PRINT("instrumenting %x pc\n", instr_get_app_pc(instr));
instr_clones[instr_clone_amount] = instr_clone(drcontext, instr);
for (i = 0; i < instr_num_srcs(instr); i++){
if (opnd_is_memory_reference(instr_get_src(instr, i))) {
drutil_insert_get_mem_addr(drcontext, bb, instr, instr_get_src(instr,i), reg1, reg2);
dr_insert_clean_call(drcontext, bb, instr, clean_call_mem_information, false, 3,
OPND_CREATE_INTPTR(instr_clones[instr_clone_amount]), opnd_create_reg(reg1), OPND_CREATE_INTPTR(false));
}
}
for (i = 0; i < instr_num_dsts(instr); i++){
if (opnd_is_memory_reference(instr_get_dst(instr, i))) {
drutil_insert_get_mem_addr(drcontext, bb, instr, instr_get_dst(instr, i), reg1, reg2);
dr_insert_clean_call(drcontext, bb, instr, clean_call_mem_information, false, 3,
OPND_CREATE_INTPTR(instr_clones[instr_clone_amount]), opnd_create_reg(reg1), OPND_CREATE_INTPTR(true));
}
}
instr_clone_amount++;
dr_mutex_unlock(mutex);
dr_restore_reg(drcontext, bb, instr, reg1, SPILL_SLOT_1);
dr_restore_reg(drcontext, bb, instr, reg2, SPILL_SLOT_2);
}
return DR_EMIT_DEFAULT;
}
/* For each memory reference app instr, we insert inline code to fill the buffer
* with an instruction entry and memory reference entries.
*/
static dr_emit_flags_t
event_app_instruction(void *drcontext, void *tag, instrlist_t *bb, instr_t *instr,
bool for_trace, bool translating, void *user_data)
{
int i;
reg_id_t *reg_next = (reg_id_t *)user_data;
bool seen_memref = false;
/* If the previous instruction was a write, we should handle it. */
if (*reg_next != DR_REG_NULL)
handle_post_write(drcontext, bb, instr, *reg_next);
*reg_next = DR_REG_NULL;
if (!instr_is_app(instr))
return DR_EMIT_DEFAULT;
if (!instr_writes_memory(instr))
return DR_EMIT_DEFAULT;
/* XXX: See above, in handle_post_write(). To simplify the handling of registers, we
* assume no instruction has multiple distinct memory destination operands.
*/
for (i = 0; i < instr_num_dsts(instr); ++i) {
if (opnd_is_memory_reference(instr_get_dst(instr, i))) {
if (seen_memref) {
DR_ASSERT_MSG(false, "Found inst with multiple memory destinations");
break;
}
*reg_next = instrument_mem(drcontext, bb, instr, instr_get_dst(instr, i));
seen_memref = true;
}
}
return DR_EMIT_DEFAULT;
}
/*
* Function that tests a single operand of an instruction to see if
* it's a memory reference, and if so, adds a call to log_mem.
*/
static void try_mem_opnd(
void *drcontext, instrlist_t *bb, instr_t *instr, char **loc,
opnd_t opnd, bool write)
{
if (!opnd_is_memory_reference(opnd))
return;
instr_format_location(instr, loc);
reg_id_t r0, r1;
drreg_status_t st;
st = drreg_reserve_register(drcontext, bb, instr, NULL, &r0);
DR_ASSERT(st == DRREG_SUCCESS);
st = drreg_reserve_register(drcontext, bb, instr, NULL, &r1);
DR_ASSERT(st == DRREG_SUCCESS);
bool ok = drutil_insert_get_mem_addr(drcontext, bb, instr, opnd, r0, r1);
DR_ASSERT(ok);
uint size = drutil_opnd_mem_size_in_bytes(opnd, instr);
dr_insert_clean_call(
drcontext, bb, instr, (void *)log_mem, false,
4, opnd_create_reg(r0), OPND_CREATE_INT32(size),
OPND_CREATE_INT32(write), OPND_CREATE_INTPTR(*loc));
st = drreg_unreserve_register(drcontext, bb, instr, r1);
DR_ASSERT(st == DRREG_SUCCESS);
st = drreg_unreserve_register(drcontext, bb, instr, r0);
DR_ASSERT(st == DRREG_SUCCESS);
}
static dr_emit_flags_t
bb_event(void* drcontext, void *tag, instrlist_t *bb, bool for_trace, bool translating)
{
instr_t *instr, *next_instr;
int opcode;
for (instr = instrlist_first(bb); instr != NULL; instr = next_instr) {
next_instr = instr_get_next(instr);
opcode = instr_get_opcode(instr);
if(instr_is_floating(instr)){
// dr_fprintf(logF, "Has seen FPU instruction with opcode %d\n",opcode);
}
else if(is_SIMD_packed(opcode)){
// dr_fprintf(logF, "Has seen SIMD packed instruction with opcode %d\n",opcode);
}
//AVX?rcpps?
else if(is_SIMD_arithm(opcode)){
int is_single = 0;
// printf("opcode is %d\n", opcode);
// printf("number of sources %d\n", instr_num_srcs(instr));
// printf("number of dests %d\n", instr_num_dsts(instr));
//assert(number of sources = 2);
opnd_t source1 = instr_get_src(instr,0);
opnd_t source2 = instr_get_src(instr,1);
opnd_t dest = instr_get_dst(instr,0);
if(opnd_is_memory_reference(source1)){
// dr_print_instr(drcontext, logF, instr, "INSTR: ");
// dr_print_opnd(drcontext, logF, source1, "OPND1: ");
// dr_print_opnd(drcontext, logF, source2, "OPND2: ");
reg_id_t rd = opnd_get_reg(source2);
reg_id_t rs = opnd_get_reg_used(source1, 0);
dr_insert_clean_call(drcontext, bb, instr,
(void*) callback, true, 5,
OPND_CREATE_INTPTR(rs), OPND_CREATE_INTPTR(opnd_get_disp(source1)),
OPND_CREATE_INTPTR(rd), OPND_CREATE_INTPTR(opcode), OPND_CREATE_INTPTR(instr_get_app_pc(instr)));
}
else if(opnd_is_reg(source1) && opnd_is_reg(source2)){
reg_id_t reg1 = opnd_get_reg(source1);
reg_id_t reg2 = opnd_get_reg(source2);
dr_insert_clean_call(drcontext,bb,instr, (void*)getRegReg,
true, 4,
OPND_CREATE_INTPTR(reg1), OPND_CREATE_INTPTR(reg2)
,OPND_CREATE_INTPTR(opcode), OPND_CREATE_INTPTR(instr_get_app_pc(instr))
);
}
else{
//should not be the case, throw an exception
}
fp_count++;
}
}
return DR_EMIT_DEFAULT;
}
/* For each memory reference app instr, we insert inline code to fill the buffer
* with an instruction entry and memory reference entries.
*/
static dr_emit_flags_t
event_app_instruction(void *drcontext, void *tag, instrlist_t *bb, instr_t *instr,
bool for_trace, bool translating, void *user_data)
{
int i;
if (!instr_is_app(instr))
return DR_EMIT_DEFAULT;
if (!instr_reads_memory(instr) && !instr_writes_memory(instr))
return DR_EMIT_DEFAULT;
/* insert code to add an entry for app instruction */
instrument_instr(drcontext, bb, instr);
/* insert code to add an entry for each memory reference opnd */
for (i = 0; i < instr_num_srcs(instr); i++) {
if (opnd_is_memory_reference(instr_get_src(instr, i)))
instrument_mem(drcontext, bb, instr, instr_get_src(instr, i), false);
}
for (i = 0; i < instr_num_dsts(instr); i++) {
if (opnd_is_memory_reference(instr_get_dst(instr, i)))
instrument_mem(drcontext, bb, instr, instr_get_dst(instr, i), true);
}
/* insert code to call clean_call for processing the buffer */
if (/* XXX i#1698: there are constraints for code between ldrex/strex pairs,
* so we minimize the instrumentation in between by skipping the clean call.
* As we're only inserting instrumentation on a memory reference, and the
* app should be avoiding memory accesses in between the ldrex...strex,
* the only problematic point should be before the strex.
* However, there is still a chance that the instrumentation code may clear the
* exclusive monitor state.
* Using a fault to handle a full buffer should be more robust, and the
* forthcoming buffer filling API (i#513) will provide that.
*/
IF_AARCHXX_ELSE(!instr_is_exclusive_store(instr), true))
dr_insert_clean_call(drcontext, bb, instr, (void *)clean_call, false, 0);
return DR_EMIT_DEFAULT;
}
static uint calculate_operands(instr_t * instr,uint dst_or_src){
opnd_t op;
int i;
int ret = 0;
if(dst_or_src == DST_TYPE){
for(i=0; i<instr_num_dsts(instr); i++){
op = instr_get_dst(instr,i);
if(opnd_is_immed(op) ||
opnd_is_memory_reference(op) ||
opnd_is_reg(op)){
ret++;
}
}
}
else if(dst_or_src == SRC_TYPE){
for(i=0; i<instr_num_srcs(instr); i++){
op = instr_get_src(instr,i);
if (instr_get_opcode(instr) == OP_lea && opnd_is_base_disp(op)){
ret += 4;
}
else if (opnd_is_immed(op) ||
opnd_is_memory_reference(op) ||
opnd_is_reg(op)){
ret++;
}
}
}
return ret;
}
/* event_bb_insert calls instrument_mem to instrument every
* application memory reference.
*/
static dr_emit_flags_t
event_bb_insert(void *drcontext, void *tag, instrlist_t *bb,
instr_t *instr, bool for_trace, bool translating,
void *user_data)
{
int i;
if (instr_get_app_pc(instr) == NULL)
return DR_EMIT_DEFAULT;
if (instr_reads_memory(instr)) {
for (i = 0; i < instr_num_srcs(instr); i++) {
if (opnd_is_memory_reference(instr_get_src(instr, i))) {
instrument_mem(drcontext, bb, instr, i, false);
}
}
}
if (instr_writes_memory(instr)) {
for (i = 0; i < instr_num_dsts(instr); i++) {
if (opnd_is_memory_reference(instr_get_dst(instr, i))) {
instrument_mem(drcontext, bb, instr, i, true);
}
}
}
return DR_EMIT_DEFAULT;
}
static bool
opnd_uses_memory_we_track(opnd_t opnd)
{
/* PR 553724: by default assume esp always points to stack and that user
* doesn't care about staleness of any stacks allocated in the heap.
*
* FIXME PR 553724: track ebp and ignore refs when ebp is clearly
* used as a frame ptr
*/
return (opnd_is_memory_reference(opnd) &&
(!options.stale_ignore_sp ||
!opnd_is_base_disp(opnd) ||
reg_to_pointer_sized(opnd_get_base(opnd)) != REG_XSP ||
opnd_get_index(opnd) != REG_NULL ||
opnd_is_far_memory_reference(opnd)));
}
static void
handle_post_write(void *drcontext, instrlist_t *ilist, instr_t *where, reg_id_t reg_addr)
{
int i;
instr_t *prev_instr = instr_get_prev_app(where);
bool seen_memref = false;
/* XXX: We assume that no write instruction has multiple distinct memory destinations.
* This way we are able to persist a single register across an app instruction. Note
* there are instructions which currently do break this assumption, but we punt on
* this.
*/
for (i = 0; i < instr_num_dsts(prev_instr); ++i) {
if (opnd_is_memory_reference(instr_get_dst(prev_instr, i))) {
if (seen_memref) {
DR_ASSERT_MSG(false, "Found inst with multiple memory destinations");
break;
}
seen_memref = true;
instrument_post_write(drcontext, ilist, where, instr_get_dst(prev_instr, i),
prev_instr, reg_addr);
}
}
}
/* prints out the operands / populates the operands in the instrace mode */
static void output_populator_printer(void * drcontext, opnd_t opnd, instr_t * instr, uint64 addr, uint mem_type, operand_t * output){
int value;
float float_value;
uint width;
int i;
per_thread_t * data = drmgr_get_tls_field(drcontext,tls_index);
if(opnd_is_reg(opnd)){
value = opnd_get_reg(opnd);
if (value != DR_REG_NULL){
width = opnd_size_in_bytes(reg_get_size(value));
}
else{
width = 0;
}
#ifdef READABLE_TRACE
dr_fprintf(data->outfile,",%u,%u,%u",REG_TYPE, width, value);
#else
output->type = REG_TYPE;
output->width = width;
output->value = value;
#endif
}
else if(opnd_is_immed(opnd)){
//DR_ASSERT(opnd_is_immed_float(opnd) == false);
if(opnd_is_immed_float(opnd)){
width = opnd_size_in_bytes(opnd_get_size(opnd));
if (instr_get_opcode(instr) == OP_fld1){
dr_fprintf(data->outfile, ",%u,%u,1", IMM_FLOAT_TYPE, width);
}
else if (instr_get_opcode(instr) == OP_fldz){
dr_fprintf(data->outfile, ",%u,%u,0", IMM_FLOAT_TYPE, width);
}
else{
dr_messagebox("immediate float unknown\n");
dr_abort();
}
//float_value = opnd_get_immed_float(opnd);
#ifdef READABLE_TRACE
//dr_fprintf(data->outfile,",%u,%u,%.4f",IMM_FLOAT_TYPE,width,float_value);
#else
output->type = IMM_FLOAT_TYPE;
output->width = width;
output->float_value = float_value;
#endif
}
if(opnd_is_immed_int(opnd)){
width = opnd_size_in_bytes(opnd_get_size(opnd));
value = opnd_get_immed_int(opnd);
#ifdef READABLE_TRACE
dr_fprintf(data->outfile,",%u,%u,%d",IMM_INT_TYPE,width,value);
#else
output->type = IMM_INT_TYPE;
output->width = width;
output->value = value;
#endif
}
}
else if(opnd_is_memory_reference(opnd)){
width = drutil_opnd_mem_size_in_bytes(opnd,instr);
#ifdef READABLE_TRACE
dr_fprintf(data->outfile, ",%u,%u,%llu",mem_type,width,addr);
#else
output->type = mem_type;
output->width = width;
output->float_value = addr;
#endif
}
}
static void dynamic_info_instrumentation(void *drcontext, instrlist_t *ilist, instr_t *where,
instr_t * static_info)
{
/*
issues that may arise
1. pc and eflags is uint but in 64 bit mode 8 byte transfers are done -> so far no problem (need to see this)
need to see whether there is a better way
2. double check all the printing
*/
/*
this function does the acutal instrumentation
arguments -
we get a filled pointer here about the operand types for a given instruction (srcs and dests)
1) increment the pointer to the instr_trace buffers
2) add this pointer to instr_trace_t wrapper
3) check whether any of the srcs and dests have memory operations; if so add a lea instruction and get the dynamic address
Add this address to instr_trace_t structure
4) if the buffer is full call a function to dump it to the file and restore the head ptr of the buffer
(lean function is used utilizing a code cache to limit code bloat needed for a clean call before every instruction.)
*/
instr_t *instr, *call, *restore, *first, *second;
opnd_t ref, opnd1, opnd2;
reg_id_t reg1 = DR_REG_XBX; /* We can optimize it by picking dead reg */
reg_id_t reg2 = DR_REG_XCX; /* reg2 must be ECX or RCX for jecxz */
reg_id_t reg3 = DR_REG_XAX;
per_thread_t *data;
uint pc;
uint i;
module_data_t * module_data;
if (client_arg->instrace_mode == DISASSEMBLY_TRACE){
dr_insert_clean_call(drcontext, ilist, where, clean_call_disassembly_trace, false, 0);
return;
}
data = drmgr_get_tls_field(drcontext, tls_index);
/* Steal the register for memory reference address *
* We can optimize away the unnecessary register save and restore
* by analyzing the code and finding the register is dead.
*/
dr_save_reg(drcontext, ilist, where, reg1, SPILL_SLOT_2);
dr_save_reg(drcontext, ilist, where, reg2, SPILL_SLOT_3);
dr_save_reg(drcontext, ilist, where, reg3, SPILL_SLOT_4);
drmgr_insert_read_tls_field(drcontext, tls_index, ilist, where, reg2);
/* Load data->buf_ptr into reg2 */
opnd1 = opnd_create_reg(reg2);
opnd2 = OPND_CREATE_MEMPTR(reg2, offsetof(per_thread_t, buf_ptr));
instr = INSTR_CREATE_mov_ld(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
/* buf_ptr->static_info_instr = static_info; */
/* Move static_info to static_info_instr field of buf (which is a instr_trace_t *) */
opnd1 = OPND_CREATE_MEMPTR(reg2, offsetof(instr_trace_t, static_info_instr));
instrlist_insert_mov_immed_ptrsz(drcontext, (ptr_int_t)static_info, opnd1, ilist, where, &first, &second);
/* buf_ptr->num_mem = 0; */
opnd1 = OPND_CREATE_MEMPTR(reg2, offsetof(instr_trace_t, num_mem));
instrlist_insert_mov_immed_ptrsz(drcontext, (ptr_int_t)0, opnd1, ilist, where, &first, &second);
for (i = 0; i<instr_num_dsts(where); i++){
if (opnd_is_memory_reference(instr_get_dst(where, i))){
ref = instr_get_dst(where, i);
DR_ASSERT(opnd_is_null(ref) == false);
dr_restore_reg(drcontext, ilist, where, reg1, SPILL_SLOT_2);
dr_restore_reg(drcontext, ilist, where, reg2, SPILL_SLOT_3);
#ifdef DEBUG_MEM_REGS
dr_insert_clean_call(drcontext, ilist, where, clean_call_disassembly_trace, false, 0);
dr_insert_clean_call(drcontext, ilist, where, clean_call_print_regvalues, false, 0);
#endif
drutil_insert_get_mem_addr(drcontext, ilist, where, ref, reg1, reg2);
#ifdef DEBUG_MEM_REGS
dr_insert_clean_call(drcontext, ilist, where, clean_call_print_regvalues, false, 0);
#endif
#ifdef DEBUG_MEM_STATS
dr_insert_clean_call(drcontext, ilist, where, clean_call_disassembly_trace, false, 0);
dr_insert_clean_call(drcontext, ilist, where, clean_call_mem_stats, false, 1, opnd_create_reg(reg1));
#endif
dr_insert_clean_call(drcontext, ilist, where, clean_call_populate_mem, false, 3, opnd_create_reg(reg1), OPND_CREATE_INT32(i), OPND_CREATE_INT32(DST_TYPE));
}
}
for (i = 0; i<instr_num_srcs(where); i++){
if (opnd_is_memory_reference(instr_get_src(where, i))){
ref = instr_get_src(where, i);
DR_ASSERT(opnd_is_null(ref) == false);
dr_restore_reg(drcontext, ilist, where, reg1, SPILL_SLOT_2);
dr_restore_reg(drcontext, ilist, where, reg2, SPILL_SLOT_3);
#ifdef DEBUG_MEM_REGS
dr_insert_clean_call(drcontext, ilist, where, clean_call_disassembly_trace, false, 0);
dr_insert_clean_call(drcontext, ilist, where, clean_call_print_regvalues, false, 0);
#endif
drutil_insert_get_mem_addr(drcontext, ilist, where, ref, reg1, reg2);
#ifdef DEBUG_MEM_REGS
dr_insert_clean_call(drcontext, ilist, where, clean_call_print_regvalues, false, 0);
#endif
#ifdef DEBUG_MEM_STATS
dr_insert_clean_call(drcontext, ilist, where, clean_call_disassembly_trace, false, 0);
dr_insert_clean_call(drcontext, ilist, where, clean_call_mem_stats, false, 1, opnd_create_reg(reg1));
#endif
dr_insert_clean_call(drcontext, ilist, where, clean_call_populate_mem, false, 3, opnd_create_reg(reg1), OPND_CREATE_INT32(i), OPND_CREATE_INT32(SRC_TYPE));
}
}
drmgr_insert_read_tls_field(drcontext, tls_index, ilist, where, reg2);
/* Load data->buf_ptr into reg2 */
opnd1 = opnd_create_reg(reg2);
opnd2 = OPND_CREATE_MEMPTR(reg2, offsetof(per_thread_t, buf_ptr));
instr = INSTR_CREATE_mov_ld(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
/* arithmetic flags are saved here for buf_ptr->eflags filling */
dr_save_arith_flags_to_xax(drcontext, ilist, where);
/* load the eflags */
opnd1 = OPND_CREATE_MEMPTR(reg2, offsetof(instr_trace_t, eflags));
opnd2 = opnd_create_reg(reg3);
instr = INSTR_CREATE_mov_st(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
/* load the app_pc */
opnd1 = OPND_CREATE_MEMPTR(reg2, offsetof(instr_trace_t, pc));
module_data = dr_lookup_module(instr_get_app_pc(where));
//dynamically generated code - module information not available - then just store 0 at the pc slot of the instr_trace data
if (module_data != NULL){
pc = instr_get_app_pc(where) - module_data->start;
dr_free_module_data(module_data);
}
else{
pc = 0;
}
instrlist_insert_mov_immed_ptrsz(drcontext, (ptr_int_t)pc, opnd1, ilist, where, &first, &second);
/* buf_ptr++; */
/* Increment reg value by pointer size using lea instr */
opnd1 = opnd_create_reg(reg2);
opnd2 = opnd_create_base_disp(reg2, DR_REG_NULL, 0,
sizeof(instr_trace_t),
OPSZ_lea);
instr = INSTR_CREATE_lea(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
/* Update the data->buf_ptr */
drmgr_insert_read_tls_field(drcontext, tls_index, ilist, where, reg1);
opnd1 = OPND_CREATE_MEMPTR(reg1, offsetof(per_thread_t, buf_ptr));
opnd2 = opnd_create_reg(reg2);
instr = INSTR_CREATE_mov_st(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
/* we use lea + jecxz trick for better performance
* lea and jecxz won't disturb the eflags, so we won't insert
* code to save and restore application's eflags.
*/
/* lea [reg2 - buf_end] => reg2 */
opnd1 = opnd_create_reg(reg1);
opnd2 = OPND_CREATE_MEMPTR(reg1, offsetof(per_thread_t, buf_end));
instr = INSTR_CREATE_mov_ld(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
opnd1 = opnd_create_reg(reg2);
opnd2 = opnd_create_base_disp(reg1, reg2, 1, 0, OPSZ_lea);
instr = INSTR_CREATE_lea(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
/* jecxz call */
call = INSTR_CREATE_label(drcontext);
opnd1 = opnd_create_instr(call);
instr = INSTR_CREATE_jecxz(drcontext, opnd1);
instrlist_meta_preinsert(ilist, where, instr);
/* jump restore to skip clean call */
restore = INSTR_CREATE_label(drcontext);
opnd1 = opnd_create_instr(restore);
instr = INSTR_CREATE_jmp(drcontext, opnd1);
instrlist_meta_preinsert(ilist, where, instr);
/* clean call */
/* We jump to lean procedure which performs full context switch and
* clean call invocation. This is to reduce the code cache size.
*/
instrlist_meta_preinsert(ilist, where, call);
/* mov restore DR_REG_XCX */
opnd1 = opnd_create_reg(reg2);
/* this is the return address for jumping back from lean procedure */
opnd2 = opnd_create_instr(restore);
/* We could use instrlist_insert_mov_instr_addr(), but with a register
* destination we know we can use a 64-bit immediate.
*/
instr = INSTR_CREATE_mov_imm(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
/* jmp code_cache */
opnd1 = opnd_create_pc(code_cache);
instr = INSTR_CREATE_jmp(drcontext, opnd1);
instrlist_meta_preinsert(ilist, where, instr);
/* restore %reg */
instrlist_meta_preinsert(ilist, where, restore);
//dr_restore_arith_flags_from_xax(drcontext, ilist, where);
dr_restore_reg(drcontext, ilist, where, reg1, SPILL_SLOT_2);
dr_restore_reg(drcontext, ilist, where, reg2, SPILL_SLOT_3);
dr_restore_reg(drcontext, ilist, where, reg3, SPILL_SLOT_4);
//instrlist_disassemble(drcontext, instr_get_app_pc(instrlist_first(ilist)), ilist, logfile);
}