// We stored the instr count in *bb_field in bb_analysis().
int
offline_instru_t::instrument_instr(void *drcontext, void *tag, void **bb_field,
instrlist_t *ilist, instr_t *where,
reg_id_t reg_ptr, reg_id_t reg_tmp, int adjust,
instr_t *app)
{
app_pc pc, modbase;
uint modidx;
offline_entry_t entry;
// We write just once per bb.
if ((ptr_uint_t)*bb_field > MAX_INSTR_COUNT)
return adjust;
pc = dr_fragment_app_pc(tag);
if (drmodtrack_lookup(drcontext, pc, &modidx, &modbase) != DRCOVLIB_SUCCESS) {
// FIXME i#2062: add non-module support. The plan for instrs is to have
// one entry w/ the start abs pc, and subsequent entries that pack the instr
// length for 10 instrs, 4 bits each, into a pc.modoffs field. We will
// also need to store the type (read/write/prefetch*) and size for the
// memrefs.
modidx = 0;
modbase = pc;
}
entry.pc.type = OFFLINE_TYPE_PC;
// We put the ARM vs Thumb mode into the modoffs to ensure proper decoding.
entry.pc.modoffs =
dr_app_pc_as_jump_target(instr_get_isa_mode(where), pc) - modbase;
entry.pc.modidx = modidx;
entry.pc.instr_count = (ptr_uint_t)*bb_field;
insert_save_pc(drcontext, ilist, where, reg_ptr, reg_tmp, adjust,
entry.combined_value);
*(ptr_uint_t*)bb_field = MAX_INSTR_COUNT + 1;
return (adjust + sizeof(offline_entry_t));
}
static void
bb_table_entry_add(void *drcontext, per_thread_t *data, app_pc start, uint size)
{
bb_entry_t *bb_entry = drtable_alloc(data->bb_table, 1, NULL);
uint mod_id;
app_pc mod_start;
drcovlib_status_t res = drmodtrack_lookup(drcontext, start, &mod_id, &mod_start);
/* we do not de-duplicate repeated bbs */
ASSERT(size < USHRT_MAX, "size overflow");
bb_entry->size = (ushort)size;
if (res == DRCOVLIB_SUCCESS) {
ASSERT(mod_id < USHRT_MAX, "module id overflow");
bb_entry->mod_id = (ushort)mod_id;
ASSERT(start > mod_start, "wrong module");
bb_entry->start = (uint)(start - mod_start);
} else {
/* XXX: we just truncate the address, which may have wrong value
* in x64 arch. It should be ok now since it is an unknown module,
* which will be ignored in the post-processing.
* Should be handled for JIT code in the future.
*/
bb_entry->mod_id = UNKNOWN_MODULE_ID;
bb_entry->start = (uint)(ptr_uint_t)start;
}
}
