static void
insert_counter_update(void *drcontext, instrlist_t *bb, instr_t *where, int offset)
{
/* Since the inc instruction clobbers 5 of the arithmetic eflags,
* we have to save them around the inc. We could be more efficient
* by not bothering to save the overflow flag and constructing our
* own sequence of instructions to save the other 5 flags (using
* lahf).
*/
if (drreg_reserve_aflags(drcontext, bb, where) != DRREG_SUCCESS) {
DR_ASSERT(false); /* cannot recover */
return;
}
/* Increment the global counter using the lock prefix to make it atomic
* across threads. It would be cheaper to aggregate the thread counters
* in the exit events, but this sample is intended to illustrate inserted
* instrumentation.
*/
instrlist_meta_preinsert(
bb, where,
LOCK(INSTR_CREATE_inc(
drcontext, OPND_CREATE_ABSMEM(((byte *)&global_count) + offset, OPSZ_4))));
/* Increment the thread private counter. */
if (dr_using_all_private_caches()) {
per_thread_t *data = (per_thread_t *)drmgr_get_tls_field(drcontext, tls_idx);
/* private caches - we can use an absolute address */
instrlist_meta_preinsert(
bb, where,
INSTR_CREATE_inc(drcontext,
OPND_CREATE_ABSMEM(((byte *)&data) + offset, OPSZ_4)));
} else {
/* shared caches - we must indirect via thread local storage */
reg_id_t scratch;
if (drreg_reserve_register(drcontext, bb, where, NULL, &scratch) != DRREG_SUCCESS)
DR_ASSERT(false);
drmgr_insert_read_tls_field(drcontext, tls_idx, bb, where, scratch);
instrlist_meta_preinsert(
bb, where, INSTR_CREATE_inc(drcontext, OPND_CREATE_MEM32(scratch, offset)));
if (drreg_unreserve_register(drcontext, bb, where, scratch) != DRREG_SUCCESS)
DR_ASSERT(false);
}
if (drreg_unreserve_aflags(drcontext, bb, where) != DRREG_SUCCESS)
DR_ASSERT(false); /* cannot recover */
}
static dr_emit_flags_t
event_basic_block(void *drcontext, void *tag, instrlist_t *bb,
bool for_trace, bool translating)
{
instr_t *instr, *first = instrlist_first(bb), *point = NULL;
uint num_instrs;
uint flags;
uint need_restore;
/* count instruction */
for (instr = first, num_instrs = 0;
instr != NULL;
instr = instr_get_next(instr)) {
num_instrs++;
}
need_restore = 0;
flags = instr_get_arith_flags(instr);
/* eflags are not dead save eflags to register */
if (!(TESTALL(EFLAGS_WRITE_6, flags) && !TESTANY(EFLAGS_READ_6, flags))) {
need_restore = 1;
dr_save_reg(drcontext, bb, first, DR_REG_XAX, SPILL_SLOT_1);
dr_save_arith_flags_to_xax(drcontext, bb, first);
}
/* add the instruction count */
instrlist_meta_preinsert
(bb, first,
INSTR_CREATE_add(drcontext, OPND_CREATE_ABSMEM
((byte *)&global_count, OPSZ_4), OPND_CREATE_INT32(num_instrs)));
/* Need to carry since it is a 8 byte variable. */
instrlist_meta_preinsert
(bb, first,
INSTR_CREATE_adc(drcontext, OPND_CREATE_ABSMEM
((byte *)&global_count + 4, OPSZ_4), OPND_CREATE_INT32(0)));
/* resotre eflags */
if (need_restore) {
dr_restore_arith_flags_from_xax(drcontext, bb, first);
dr_restore_reg(drcontext, bb, first, DR_REG_XAX, SPILL_SLOT_1);
}
return DR_EMIT_DEFAULT;
}
static void
insert_counter_update(void *drcontext, instrlist_t *bb, instr_t *where, int offset)
{
/* Since the inc instruction clobbers 5 of the arithmetic eflags,
* we have to save them around the inc. We could be more efficient
* by not bothering to save the overflow flag and constructing our
* own sequence of instructions to save the other 5 flags (using
* lahf) or by doing a liveness analysis on the flags and saving
* only if live.
*/
dr_save_reg(drcontext, bb, where, DR_REG_XAX, SPILL_SLOT_1);
dr_save_arith_flags_to_xax(drcontext, bb, where);
/* Increment the global counter using the lock prefix to make it atomic
* across threads. It would be cheaper to aggregate the thread counters
* in the exit events, but this sample is intended to illustrate inserted
* instrumentation.
*/
instrlist_meta_preinsert(bb, where, LOCK(INSTR_CREATE_inc
(drcontext, OPND_CREATE_ABSMEM(((byte *)&global_count) + offset, OPSZ_4))));
/* Increment the thread private counter. */
if (dr_using_all_private_caches()) {
per_thread_t *data = (per_thread_t *) dr_get_tls_field(drcontext);
/* private caches - we can use an absolute address */
instrlist_meta_preinsert(bb, where, INSTR_CREATE_inc(drcontext,
OPND_CREATE_ABSMEM(((byte *)&data) + offset, OPSZ_4)));
} else {
/* shared caches - we must indirect via thread local storage */
/* We spill xbx to use a scratch register (we could do a liveness
* analysis to try and find a dead register to use). Note that xax
* is currently holding the saved eflags. */
dr_save_reg(drcontext, bb, where, DR_REG_XBX, SPILL_SLOT_2);
dr_insert_read_tls_field(drcontext, bb, where, DR_REG_XBX);
instrlist_meta_preinsert(bb, where,
INSTR_CREATE_inc(drcontext, OPND_CREATE_MEM32(DR_REG_XBX, offset)));
dr_restore_reg(drcontext, bb, where, DR_REG_XBX, SPILL_SLOT_2);
}
/* Restore flags and xax. */
dr_restore_arith_flags_from_xax(drcontext, bb, where);
dr_restore_reg(drcontext, bb, where, DR_REG_XAX, SPILL_SLOT_1);
}
/* save aflags from eax */
void
umbra_save_eax_aflags(void *drcontext,
umbra_info_t *info,
instrlist_t *ilist,
instr_t *where)
{
instr_t *instr;
instr = INSTR_CREATE_mov_st(drcontext,
OPND_CREATE_ABSMEM(&info->aflags,
OPSZ_4),
opnd_create_reg(DR_REG_EAX));
instrlist_meta_preinsert(ilist, where, instr);
}
static dr_emit_flags_t
event_app_instruction(void *drcontext, void *tag, instrlist_t *bb, instr_t *inst,
bool for_trace, bool translating, void *user_data)
{
#ifdef SHOW_RESULTS
bool aflags_dead;
#endif
if (!drmgr_is_first_instr(drcontext, inst))
return DR_EMIT_DEFAULT;
#ifdef VERBOSE
dr_printf("in dynamorio_basic_block(tag="PFX")\n", tag);
# ifdef VERBOSE_VERBOSE
instrlist_disassemble(drcontext, tag, bb, STDOUT);
# endif
#endif
#ifdef SHOW_RESULTS
if (drreg_are_aflags_dead(drcontext, inst, &aflags_dead) == DRREG_SUCCESS &&
!aflags_dead)
bbs_eflags_saved++;
else
bbs_no_eflags_saved++;
#endif
/* We demonstrate how to use drreg for aflags save/restore here.
* We could use drx_insert_counter_update instead of drreg.
* Xref sample opcodes.c as an example of using drx_insert_counter_update.
*/
if (drreg_reserve_aflags(drcontext, bb, inst) != DRREG_SUCCESS)
DR_ASSERT(false && "fail to reserve aflags!");
/* racy update on the counter for better performance */
instrlist_meta_preinsert
(bb, inst,
INSTR_CREATE_inc(drcontext, OPND_CREATE_ABSMEM
((byte *)&global_count, OPSZ_4)));
if (drreg_unreserve_aflags(drcontext, bb, inst) != DRREG_SUCCESS)
DR_ASSERT(false && "fail to unreserve aflags!");
#if defined(VERBOSE) && defined(VERBOSE_VERBOSE)
dr_printf("Finished instrumenting dynamorio_basic_block(tag="PFX")\n", tag);
instrlist_disassemble(drcontext, tag, bb, STDOUT);
#endif
return DR_EMIT_DEFAULT;
}
DR_EXPORT
bool
drmgr_insert_read_tls_field(void *drcontext, int idx,
instrlist_t *ilist, instr_t *where, reg_id_t reg)
{
tls_array_t *tls = (tls_array_t *) dr_get_tls_field(drcontext);
if (idx < 0 || idx > MAX_NUM_TLS || !tls_taken[idx] || tls == NULL)
return false;
if (!reg_is_gpr(reg) || !reg_is_pointer_sized(reg))
return false;
dr_insert_read_tls_field(drcontext, ilist, where, reg);
instrlist_meta_preinsert(ilist, where, INSTR_CREATE_mov_ld
(drcontext, opnd_create_reg(reg),
OPND_CREATE_MEMPTR(reg, offsetof(tls_array_t, tls) +
idx*sizeof(void*))));
return true;
}
/* save reg before where in ilist */
void
umbra_save_reg(void *drcontext,
umbra_info_t *info,
instrlist_t *ilist,
instr_t *where,
reg_id_t reg)
{
int slot;
instr_t *instr;
DR_ASSERT(reg >= REG_SPILL_START && reg <= REG_SPILL_STOP);
slot = reg - REG_SPILL_START;
instr = INSTR_CREATE_mov_st(drcontext,
OPND_CREATE_ABSMEM(&info->spill_regs[slot],
OPSZ_PTR),
opnd_create_reg(reg));
instrlist_meta_preinsert(ilist, where, instr);
}
static dr_emit_flags_t
event_bb_insert(void *drcontext, void *tag, instrlist_t *bb, instr_t *inst,
bool for_trace, bool translating, void *user_data)
{
/* hack to instrument every nth bb. assumes DR serializes bb events. */
static int freq;
freq++;
if (freq % 100 == 0 && inst == (instr_t*)user_data/*first instr*/) {
/* test read from cache */
dr_save_reg(drcontext, bb, inst, DR_REG_XAX, SPILL_SLOT_1);
drmgr_insert_read_tls_field(drcontext, tls_idx, bb, inst, DR_REG_XAX);
dr_insert_clean_call(drcontext, bb, inst, (void *)check_tls_from_cache,
false, 1, opnd_create_reg(DR_REG_XAX));
drmgr_insert_read_cls_field(drcontext, cls_idx, bb, inst, DR_REG_XAX);
dr_insert_clean_call(drcontext, bb, inst, (void *)check_cls_from_cache,
false, 1, opnd_create_reg(DR_REG_XAX));
dr_restore_reg(drcontext, bb, inst, DR_REG_XAX, SPILL_SLOT_1);
}
if (freq % 300 == 0 && inst == (instr_t*)user_data/*first instr*/) {
/* test write from cache */
dr_save_reg(drcontext, bb, inst, DR_REG_XAX, SPILL_SLOT_1);
dr_save_reg(drcontext, bb, inst, DR_REG_XCX, SPILL_SLOT_2);
instrlist_meta_preinsert(bb, inst, INSTR_CREATE_mov_imm
(drcontext, opnd_create_reg(DR_REG_EAX),
OPND_CREATE_INT32(MAGIC_NUMBER_FROM_CACHE)));
drmgr_insert_write_tls_field(drcontext, tls_idx, bb, inst, DR_REG_XAX,
DR_REG_XCX);
dr_insert_clean_call(drcontext, bb, inst, (void *)check_tls_write_from_cache,
false, 0);
drmgr_insert_write_cls_field(drcontext, cls_idx, bb, inst, DR_REG_XAX,
DR_REG_XCX);
dr_insert_clean_call(drcontext, bb, inst, (void *)check_cls_write_from_cache,
false, 0);
dr_restore_reg(drcontext, bb, inst, DR_REG_XCX, SPILL_SLOT_2);
dr_restore_reg(drcontext, bb, inst, DR_REG_XAX, SPILL_SLOT_1);
}
return DR_EMIT_DEFAULT;
}
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);
}
static void
instrument_mem(void *drcontext, instrlist_t *ilist, instr_t *where,
int pos, bool write)
{
instr_t *instr;
opnd_t ref, opnd1, opnd2;
reg_id_t reg1 = DR_REG_XAX; /* We can optimize it by picking dead reg */
reg_id_t reg2 = DR_REG_XCX; /* reg2 must be ECX or RCX for jecxz */
if (write)
ref = instr_get_dst(where, pos);
else
ref = instr_get_src(where, pos);
dr_save_reg(drcontext, ilist, where, reg1, SPILL_SLOT_2);
dr_save_reg(drcontext, ilist, where, reg2, SPILL_SLOT_3);
// reg2 = RBufIdx
opnd1 = opnd_create_reg(reg2);
opnd2 = OPND_CREATE_ABSMEM((byte *)&RBufIdx, OPSZ_4);
instr = INSTR_CREATE_mov_ld(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
// save flags since we are using inc, and
dr_save_arith_flags_to_xax(drcontext, ilist, where);
// reg2 = reg2 & RBUF_SIZE
opnd1 = opnd_create_reg(reg2);
opnd2 = OPND_CREATE_INT32(RBUF_SIZE);
instr = INSTR_CREATE_and(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
dr_restore_arith_flags_from_xax(drcontext, ilist, where);
// reg1 = &RBuf
opnd1 = opnd_create_reg(reg1);
opnd2 = OPND_CREATE_INTPTR(RBuf);
instr = INSTR_CREATE_mov_imm(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
// reg1 = reg1 + reg2 * sizeof(uint)
// = RBuf + RBufIdx * sizeof(uint)
// = RBuf[RBufIdx]
opnd1 = opnd_create_reg(reg1);
opnd2 = opnd_create_base_disp(reg1, reg2, sizeof(uint), 0, OPSZ_lea);
instr = INSTR_CREATE_lea(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
// RBuf[RBufIdx].addr = addr;
opnd1 = OPND_CREATE_MEMPTR(reg1, 0);
drutil_insert_get_mem_addr(drcontext, ilist, where, ref, reg2, reg1);
opnd2 = opnd_create_reg(reg2);
instr = INSTR_CREATE_mov_st(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
dr_save_arith_flags_to_xax(drcontext, ilist, where);
// reg2 = RBufIdx
opnd1 = opnd_create_reg(reg2);
opnd2 = OPND_CREATE_ABSMEM((byte *)&RBufIdx, OPSZ_4);
instr = INSTR_CREATE_mov_ld(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
// reg2 = reg2 + 1
opnd1 = opnd_create_reg(reg2);
instr = INSTR_CREATE_inc(drcontext, opnd1);
instrlist_meta_preinsert(ilist, where, instr);
// RBufIdx = reg2
opnd1 = OPND_CREATE_ABSMEM((byte *)&RBufIdx, OPSZ_4);
opnd2 = opnd_create_reg(reg2);
instr = INSTR_CREATE_mov_st(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
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);
}
static dr_emit_flags_t
event_basic_block(void *drcontext, void *tag, instrlist_t *bb,
bool for_trace, bool translating)
{
int i;
const int MAX_INSTR_LEN = 64;
char instr_name[MAX_INSTR_LEN];
instr_t *instr, *first = instrlist_first(bb);
uint flags;
uint cur_flop_count = 0;
uint tracked_instr_count[tracked_instrs_len];
for( i = 0; i < tracked_instrs_len; i++ ) tracked_instr_count[i] = 0;
#ifdef VERBOSE
dr_printf("in dynamorio_basic_block(tag="PFX")\n", tag);
# ifdef VERBOSE_VERBOSE
instrlist_disassemble(drcontext, tag, bb, STDOUT);
# endif
#endif
/* we use fp ops so we have to save fp state */
byte fp_raw[512 + 16];
byte *fp_align = (byte *) ( (((ptr_uint_t)fp_raw) + 16) & ((ptr_uint_t)-16) );
if (translating) {
return DR_EMIT_DEFAULT;
}
proc_save_fpstate(fp_align);
int my_readfrom[DR_REG_LAST_VALID_ENUM+MY_NUM_EFLAGS+1];
int my_writtento[DR_REG_LAST_VALID_ENUM+MY_NUM_EFLAGS+1];
for (i = 0; i < DR_REG_LAST_VALID_ENUM+MY_NUM_EFLAGS+1; i++) {
my_readfrom[i] = 0;
my_writtento[i] = 0;
}
t_glob_reg_state glob_reg_state = {0,0,0,0,0,0,my_readfrom,my_writtento};
int my_cur_size = 0;
for (instr = instrlist_first(bb); instr != NULL; instr = instr_get_next(instr)) {
my_cur_size++;
/* ILP Calculations */
glob_reg_state.raw_setnr = 1;
glob_reg_state.war_setnr = 1;
glob_reg_state.waw_setnr = 1;
glob_reg_state.else_setnr = 1;
glob_reg_state.final_setnr = 1;
calc_set_num(instr, &glob_reg_state);
/* Count flop instr */
if( instr_is_floating( instr ) ) {
cur_flop_count += 1;
}
/* Count mul instructions */
instr_disassemble_to_buffer( drcontext, instr, instr_name, MAX_INSTR_LEN );
for( i = 0; i < tracked_instrs_len; i++ ) {
if( strncmp( instr_name, tracked_instrs[i], strlen(tracked_instrs[i])) == 0) {
tracked_instr_count[i] += 1;
}
}
}
//now we can calculate the ILP.
float ilp = ((float)my_cur_size) / ((float)(glob_reg_state.num_sets != 0 ?
glob_reg_state.num_sets : 1));
dr_mutex_lock(stats_mutex);
// Due to lack of memory, we only store the ILPs for the latest MY_MAX_BB
// basic blocks. This enables us to run e.g. firefox.
int my_cur_num = my_bbcount % MY_MAX_BB;
my_bbcount++;
if(my_cur_num == 0 && my_bbcount > 1) {
dr_printf("Overflow at %d\n", my_bbcount);
}
my_bbexecs[my_cur_num] = 0; //initialize
my_bbsizes[my_cur_num] = my_cur_size;
bb_flop_count[my_cur_num] = cur_flop_count;
for( i = 0; i < tracked_instrs_len; i++ ) {
bb_instr_count[my_cur_num*tracked_instrs_len+i] = tracked_instr_count[i];
}
my_bbilp[my_cur_num] = ilp;
dr_mutex_unlock(stats_mutex);
#ifdef USE_CLEAN_CALL
dr_insert_clean_call(drcontext, bb, instrlist_first(bb), clean_call, false, 1,
OPND_CREATE_INT32(my_cur_num));
#else
#ifdef INSERT_AT_END
instr = NULL;
#else
// Find place to insert inc instruction
for (instr = first; instr != NULL; instr = instr_get_next(instr)) {
flags = instr_get_arith_flags(instr);
if (TESTALL(EFLAGS_WRITE_6, flags) && !TESTANY(EFLAGS_READ_6, flags))
break;
}
#endif
if (instr == NULL) { // no suitable place found, save regs
dr_save_reg(drcontext, bb, first, DR_REG_XAX, SPILL_SLOT_1);
dr_save_arith_flags_to_xax(drcontext, bb, first);
}
// Increment my_bbexecs[my_current_bb] using the lock prefix
instrlist_meta_preinsert
(bb, (instr == NULL) ? first : instr,
LOCK(INSTR_CREATE_inc(drcontext, OPND_CREATE_ABSMEM
((byte *)&(my_bbexecs[my_cur_num]), OPSZ_4))));
if (instr == NULL) { // no suitable place found earlier, restore regs
dr_restore_arith_flags_from_xax(drcontext, bb, first);
dr_restore_reg(drcontext, bb, first, DR_REG_XAX, SPILL_SLOT_1);
}
#endif
proc_restore_fpstate(fp_align);
#if defined(VERBOSE) && defined(VERBOSE_VERBOSE)
dr_printf("Finished instrumenting dynamorio_basic_block(tag="PFX")\n", tag);
instrlist_disassemble(drcontext, tag, bb, STDOUT);
#endif
return DR_EMIT_DEFAULT;
}
/* instrument_instr is called whenever a memory reference is identified.
* It inserts code before the memory reference to to fill the memory buffer
* and jump to our own code cache to call the clean_call when the buffer is full.
*/
static void
instrument_instr(void *drcontext, instrlist_t *ilist, instr_t *where)
{
instr_t *instr, *call, *restore;
opnd_t opnd1, opnd2;
reg_id_t reg1, reg2;
drvector_t allowed;
per_thread_t *data;
app_pc pc;
data = drmgr_get_tls_field(drcontext, tls_index);
/* Steal two scratch registers.
* reg2 must be ECX or RCX for jecxz.
*/
drreg_init_and_fill_vector(&allowed, false);
drreg_set_vector_entry(&allowed, DR_REG_XCX, true);
if (drreg_reserve_register(drcontext, ilist, where, &allowed, ®2) !=
DRREG_SUCCESS ||
drreg_reserve_register(drcontext, ilist, where, NULL, ®1) != DRREG_SUCCESS) {
DR_ASSERT(false); /* cannot recover */
drvector_delete(&allowed);
return;
}
drvector_delete(&allowed);
/* The following assembly performs the following instructions
* buf_ptr->pc = pc;
* buf_ptr->opcode = opcode;
* buf_ptr++;
* if (buf_ptr >= buf_end_ptr)
* clean_call();
*/
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);
/* Store pc */
pc = instr_get_app_pc(where);
/* For 64-bit, we can't use a 64-bit immediate so we split pc into two halves.
* We could alternatively load it into reg1 and then store reg1.
* We use a convenience routine that does the two-step store for us.
*/
opnd1 = OPND_CREATE_MEMPTR(reg2, offsetof(ins_ref_t, pc));
instrlist_insert_mov_immed_ptrsz(drcontext, (ptr_int_t) pc, opnd1,
ilist, where, NULL, NULL);
/* Store opcode */
opnd1 = OPND_CREATE_MEMPTR(reg2, offsetof(ins_ref_t, opcode));
opnd2 = OPND_CREATE_INT32(instr_get_opcode(where));
instr = INSTR_CREATE_mov_st(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
/* 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(ins_ref_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 the lea + jecxz trick for better performance.
* lea and jecxz won't disturb the eflags, so we won't need
* code to save and restore the 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 our generated lean procedure which performs a 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 the 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 scratch registers */
instrlist_meta_preinsert(ilist, where, restore);
if (drreg_unreserve_register(drcontext, ilist, where, reg1) != DRREG_SUCCESS ||
drreg_unreserve_register(drcontext, ilist, where, reg2) != DRREG_SUCCESS)
DR_ASSERT(false);
}
/*
* instrument_mem is called whenever a memory reference is identified.
* It inserts code before the memory reference to to fill the memory buffer
* and jump to our own code cache to call the clean_call when the buffer is full.
*/
static void
instrument_mem(void *drcontext, instrlist_t *ilist, instr_t *where,
int pos, bool write)
{
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 */
per_thread_t *data;
app_pc pc;
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);
if (write)
ref = instr_get_dst(where, pos);
else
ref = instr_get_src(where, pos);
/* use drutil to get mem address */
drutil_insert_get_mem_addr(drcontext, ilist, where, ref, reg1, reg2);
/* The following assembly performs the following instructions
* buf_ptr->write = write;
* buf_ptr->addr = addr;
* buf_ptr->size = size;
* buf_ptr->pc = pc;
* buf_ptr++;
* if (buf_ptr >= buf_end_ptr)
* clean_call();
*/
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);
/* Move write/read to write field */
opnd1 = OPND_CREATE_MEM32(reg2, offsetof(mem_ref_t, write));
opnd2 = OPND_CREATE_INT32(write);
instr = INSTR_CREATE_mov_imm(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
/* Store address in memory ref */
opnd1 = OPND_CREATE_MEMPTR(reg2, offsetof(mem_ref_t, addr));
opnd2 = opnd_create_reg(reg1);
instr = INSTR_CREATE_mov_st(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
/* Store size in memory ref */
opnd1 = OPND_CREATE_MEMPTR(reg2, offsetof(mem_ref_t, size));
/* drutil_opnd_mem_size_in_bytes handles OP_enter */
opnd2 = OPND_CREATE_INT32(drutil_opnd_mem_size_in_bytes(ref, where));
instr = INSTR_CREATE_mov_st(drcontext, opnd1, opnd2);
instrlist_meta_preinsert(ilist, where, instr);
/* Store pc in memory ref */
pc = instr_get_app_pc(where);
/* For 64-bit, we can't use a 64-bit immediate so we split pc into two halves.
* We could alternatively load it into reg1 and then store reg1.
* We use a convenience routine that does the two-step store for us.
*/
opnd1 = OPND_CREATE_MEMPTR(reg2, offsetof(mem_ref_t, pc));
instrlist_insert_mov_immed_ptrsz(drcontext, (ptr_int_t) pc, opnd1,
ilist, where, &first, &second);
instr_set_ok_to_mangle(first, false/*meta*/);
if (second != NULL)
instr_set_ok_to_mangle(second, false/*meta*/);
/* 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(mem_ref_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_reg(drcontext, ilist, where, reg1, SPILL_SLOT_2);
dr_restore_reg(drcontext, ilist, where, reg2, SPILL_SLOT_3);
}
/** Combines instr_set_translation and instrlist_meta_preinsert calls. */
instr_t* prexl8(instrlist_t* frag, instr_t* where, instr_t* instr, app_pc pc) {
instr_set_translation(instr, pc);
instrlist_meta_preinsert(frag, where, instr);
return instr;
}