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rizin/librz/core/casm.c

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// SPDX-FileCopyrightText: 2009-2019 nibble <nibble.ds@gmail.com>
// SPDX-FileCopyrightText: 2009-2019 pancake <pancake@nopcode.org>
// SPDX-License-Identifier: LGPL-3.0-only
#include <rz_util/rz_regex.h>
#include <rz_vector.h>
#include <rz_types.h>
#include <rz_core.h>
#include <rz_asm.h>
static RzCoreAsmHit *find_addr(RzList /*<RzCoreAsmHit *>*/ *hits, ut64 addr);
static int prune_hits_in_hit_range(RzList /*<RzCoreAsmHit *>*/ *hits, RzCoreAsmHit *hit);
static int is_hit_inrange(RzCoreAsmHit *hit, ut64 start_range, ut64 end_range);
static int is_addr_in_range(ut64 start, ut64 end, ut64 start_range, ut64 end_range);
static void add_hit_to_sorted_hits(RzList /*<RzCoreAsmHit *>*/ *hits, ut64 addr, int len, ut8 is_valid);
static int prune_hits_in_addr_range(RzList /*<RzCoreAsmHit *>*/ *hits, ut64 addr, ut64 len, ut8 is_valid);
static int coreasm_address_comparator(RzCoreAsmHit *a, RzCoreAsmHit *b, void *user) {
if (a->addr == b->addr) {
return 0;
}
if (a->addr < b->addr) {
return -1;
}
return 1; /* a->addr > b->addr */
}
RZ_API RzCoreAsmHit *rz_core_asm_hit_new(void) {
RzCoreAsmHit *hit = RZ_NEW0(RzCoreAsmHit);
if (!hit) {
return NULL;
}
hit->addr = -1;
hit->valid = false;
return hit;
}
RZ_API RzList /*<RzCoreAsmHit *>*/ *rz_core_asm_hit_list_new(void) {
RzList *list = rz_list_new();
if (list) {
list->free = &rz_core_asm_hit_free;
}
return list;
}
RZ_API void rz_core_asm_hit_free(void *_hit) {
RzCoreAsmHit *hit = _hit;
if (hit) {
if (hit->code) {
free(hit->code);
}
free(hit);
}
}
RZ_API char *rz_core_asm_search(RzCore *core, const char *input) {
RzAsmCode *acode;
char *ret;
if (!(acode = rz_asm_massemble(core->rasm, input))) {
return NULL;
}
ret = rz_asm_code_get_hex(acode);
rz_asm_code_free(acode);
return ret;
}
static const char *has_esil(RzCore *core, const char *name) {
rz_return_val_if_fail(core && core->analysis && name, NULL);
RzIterator *iter = ht_sp_as_iter(core->analysis->plugins);
RzAnalysisPlugin **val;
rz_iterator_foreach(iter, val) {
RzAnalysisPlugin *h = *val;
if (!h->name || strcmp(name, h->name)) {
continue;
}
if (h->il_config && h->esil) {
// Analysis with RzIL and ESIL
rz_iterator_free(iter);
return "AeI";
} else if (h->il_config) {
// Analysis with RzIL
rz_iterator_free(iter);
return "A_I";
} else if (h->esil) {
// Analysis with ESIL
rz_iterator_free(iter);
return "Ae_";
}
// Only the analysis plugin.
rz_iterator_free(iter);
return "A__";
}
rz_iterator_free(iter);
return "___";
}
static void bits_to_string(int bits, char output[32]) {
if (bits == 27) {
strcat(output, "27");
return;
} else if (!bits) {
strcat(output, "any");
return;
}
if (bits & 4) {
strcat(output, "4 ");
}
if (bits & 8) {
strcat(output, "8 ");
}
if (bits & 16) {
strcat(output, "16 ");
}
if (bits & 32) {
strcat(output, "32 ");
}
if (bits & 64) {
strcat(output, "64");
}
}
static RzCmdStatus core_asm_plugin_print(RzCore *core, RzAsmPlugin *ap, RzCmdStateOutput *state, const char *flags) {
const char *feat2;
char features[6] = "__";
char bits[32] = { 0 };
PJ *pj = state->d.pj;
bits_to_string(ap->bits, bits);
if (ap->assemble && ap->disassemble) {
strcpy(features, "ad");
}
if (ap->assemble && !ap->disassemble) {
strcpy(features, "a_");
}
if (!ap->assemble && ap->disassemble) {
strcpy(features, "_d");
}
feat2 = has_esil(core, ap->name);
strcat(features, feat2);
for (int i = 0; flags && flags[i] != '\0'; i++) {
if (strchr(features, flags[i]) == NULL) {
return RZ_CMD_STATUS_OK;
}
}
const char *name = rz_str_get(ap->name);
const char *description = rz_str_get(ap->desc);
const char *license = rz_str_get(ap->license);
const char *author = rz_str_get(ap->author);
const char *version = rz_str_get(ap->version);
switch (state->mode) {
case RZ_OUTPUT_MODE_QUIET: {
rz_cons_println(name);
break;
}
case RZ_OUTPUT_MODE_TABLE: {
rz_table_add_rowf(state->d.t, "sssssss", features, bits, name, license, version, author, description);
break;
}
case RZ_OUTPUT_MODE_JSON: {
pj_ko(pj, name);
pj_ks(pj, "bits", bits);
pj_ks(pj, "license", license);
pj_ks(pj, "description", description);
pj_ks(pj, "features", features);
if (ap->author) {
pj_ks(pj, "author", author);
}
if (ap->version) {
pj_ks(pj, "version", version);
}
pj_end(pj);
break;
}
case RZ_OUTPUT_MODE_STANDARD: {
rz_cons_printf("%s %-10s %-11s %-7s %s",
features, bits, name, license, description);
if (ap->author) {
rz_cons_printf(" (by %s)", author);
}
if (ap->version) {
rz_cons_printf(" v%s", version);
}
rz_cons_newline();
break;
}
default: {
rz_warn_if_reached();
return RZ_CMD_STATUS_NONEXISTINGCMD;
}
}
return RZ_CMD_STATUS_OK;
}
RZ_API RzCmdStatus rz_core_asm_cpu_plugin_print(RZ_NONNULL RZ_BORROW RzCore *core, RZ_OUT RzCmdStateOutput *state, RZ_NULLABLE const char *arch_name) {
rz_return_val_if_fail(core && state, RZ_CMD_STATUS_ERROR);
RzAsm *a = core->rasm;
if (RZ_STR_ISEMPTY(arch_name)) {
return RZ_CMD_STATUS_WRONG_ARGS;
}
bool found = false;
RzAsmPlugin *plugin = ht_sp_find(a->plugins, arch_name, &found);
if (!found || !plugin) {
return RZ_CMD_STATUS_WRONG_ARGS;
}
rz_cmd_state_output_array_start(state);
if (RZ_STR_ISEMPTY(plugin->cpus)) {
// there are no cpus to show.
rz_cmd_state_output_array_end(state);
return RZ_CMD_STATUS_OK;
}
const char *name;
RzListIter *it;
RzList *list = rz_str_split_duplist_n(plugin->cpus, ",", 0, true);
if (!list) {
return RZ_CMD_STATUS_ERROR;
}
PJ *pj = state->d.pj;
rz_list_foreach (list, it, name) {
switch (state->mode) {
case RZ_OUTPUT_MODE_STANDARD:
rz_cons_println(name);
break;
case RZ_OUTPUT_MODE_JSON:
pj_s(pj, name);
break;
default:
rz_warn_if_reached();
break;
}
}
rz_list_free(list);
rz_cmd_state_output_array_end(state);
return RZ_CMD_STATUS_OK;
}
RZ_API RzCmdStatus rz_core_asm_plugins_print(RZ_NONNULL RZ_BORROW RzCore *core, RZ_OUT RzCmdStateOutput *state, RZ_NULLABLE const char *flags) {
rz_return_val_if_fail(core && state, RZ_CMD_STATUS_ERROR);
RzAsm *a = core->rasm;
RzIterator *iter = ht_sp_as_iter(a->plugins);
RzList *plugin_list = rz_list_new_from_iterator(iter);
if (!plugin_list) {
rz_iterator_free(iter);
return RZ_CMD_STATUS_ERROR;
}
rz_list_sort(plugin_list, (RzListComparator)rz_asm_plugin_cmp, NULL);
RzListIter *it;
RzAsmPlugin *ap;
RzCmdStatus status;
rz_cmd_state_output_array_start(state);
rz_cmd_state_output_set_columnsf(state, "sssssss", "name", "bits", "features", "license", "version", "author", "description");
rz_list_foreach (plugin_list, it, ap) {
status = core_asm_plugin_print(core, ap, state, flags);
if (status != RZ_CMD_STATUS_OK) {
rz_iterator_free(iter);
rz_list_free(plugin_list);
return status;
}
}
rz_cmd_state_output_array_end(state);
rz_list_free(plugin_list);
rz_iterator_free(iter);
return RZ_CMD_STATUS_OK;
}
RZ_API RzCmdStatus rz_core_cpu_descs_print(RZ_NONNULL RzCore *core, RZ_NONNULL const char *plugin) {
rz_return_val_if_fail(core && plugin && core->rasm, RZ_CMD_STATUS_ERROR);
RzAsm *a = core->rasm;
RzIterator *iter = ht_sp_as_iter(a->plugins);
RzList *plugin_list = rz_list_new_from_iterator(iter);
if (!plugin_list) {
rz_iterator_free(iter);
return RZ_CMD_STATUS_ERROR;
}
rz_list_sort(plugin_list, (RzListComparator)rz_asm_plugin_cmp, NULL);
RzListIter *it;
RzAsmPlugin *ap;
rz_list_foreach (plugin_list, it, ap) {
if (ap->cpus && RZ_STR_EQ(plugin, ap->name)) {
char **desc = ap->get_cpu_desc();
if (!desc) {
rz_iterator_free(iter);
rz_list_free(plugin_list);
return RZ_CMD_STATUS_ERROR;
}
for (size_t i = 0; desc[i] != NULL; i += 2) {
rz_cons_printf("%-15s %s", desc[i], desc[i + 1]);
rz_cons_newline();
}
break;
}
}
rz_iterator_free(iter);
rz_list_free(plugin_list);
return RZ_CMD_STATUS_OK;
}
// TODO: add support for byte-per-byte opcode search
RZ_API RzList /*<RzCoreAsmHit *>*/ *rz_core_asm_strsearch(RzCore *core, const char *input, ut64 from, ut64 to, int maxhits, int regexp, int everyByte, int mode) {
RzCoreAsmHit *hit;
RzList *hits;
ut64 at, toff = core->offset;
ut8 *buf;
int align = core->search->align;
RzRegex *rx = NULL;
char *tok, *tokens[1024], *code = NULL, *ptr;
int idx, tidx = 0, len = 0;
int tokcount, matchcount, count = 0;
int matches = 0;
const int addrbytes = core->io->addrbytes;
if (!input || !*input) {
return NULL;
}
char *inp = rz_str_trim_dup(input + 1);
char *inp_arg = strchr(inp, ' ');
if (inp_arg) {
*inp_arg++ = 0;
}
ut64 usrimm = rz_num_math(core->num, inp);
ut64 usrimm2 = inp_arg ? rz_num_math(core->num, inp_arg) : usrimm;
if (usrimm > usrimm2) {
RZ_LOG_ERROR("core: Invalid range [0x%08" PFMT64x ":0x%08" PFMT64x "]\n", usrimm, usrimm2);
free(inp);
return NULL;
}
if (core->blocksize < 8) {
RZ_LOG_ERROR("core: block size is too small\n");
free(inp);
return NULL;
}
if (!(buf = (ut8 *)calloc(core->blocksize, 1))) {
free(inp);
return NULL;
}
if (!(ptr = rz_str_dup(input))) {
free(buf);
free(inp);
return NULL;
}
if (!(hits = rz_core_asm_hit_list_new())) {
free(buf);
free(ptr);
free(inp);
return NULL;
}
tokens[0] = NULL;
for (tokcount = 0; tokcount < RZ_ARRAY_SIZE(tokens) - 1; tokcount++) {
tok = strtok(tokcount ? NULL : ptr, ";");
if (!tok) {
break;
}
rz_str_trim(tok);
tokens[tokcount] = tok;
}
tokens[tokcount] = NULL;
rz_cons_break_push(NULL, NULL);
char *opst = NULL;
for (at = from; at < to; at += core->blocksize) {
if (rz_cons_is_breaked()) {
break;
}
if (!rz_io_is_valid_offset(core->io, at, 0)) {
break;
}
(void)rz_io_read_at(core->io, at, buf, core->blocksize);
idx = 0, matchcount = 0;
while (addrbytes * (idx + 1) <= core->blocksize) {
ut64 addr = at + idx;
if (addr > to) {
break;
}
rz_asm_set_pc(core->rasm, addr);
if (mode == 'i') {
RzAnalysisOp aop = { 0 };
ut64 len = RZ_MIN(15, core->blocksize - idx);
rz_analysis_op_init(&aop);
if (rz_analysis_op(core->analysis, &aop, addr, buf + idx, len, RZ_ANALYSIS_OP_MASK_BASIC | RZ_ANALYSIS_OP_MASK_DISASM) < 1) {
idx++; // TODO: honor mininstrsz
rz_analysis_op_fini(&aop);
continue;
}
ut64 val = aop.val; // Referenced value
bool match = (val != UT64_MAX && val >= usrimm && val <= usrimm2);
if (!match) {
for (size_t i = 0; i < 6; ++i) {
st64 v = aop.analysis_vals[i].imm;
match = (v != ST64_MAX && v >= usrimm && v <= usrimm2);
if (match) {
break;
}
}
}
if (!match) {
ut64 val = aop.disp;
match = (val != UT64_MAX && val >= usrimm && val <= usrimm2);
}
if (!match) {
st64 val = aop.ptr;
match = (val != ST64_MAX && val >= usrimm && val <= usrimm2);
}
if (match) {
if (!(hit = rz_core_asm_hit_new())) {
rz_list_purge(hits);
RZ_FREE(hits);
rz_analysis_op_fini(&aop);
goto beach;
}
hit->addr = addr;
hit->len = aop.size; // idx + len - tidx;
if (hit->len == -1) {
rz_core_asm_hit_free(hit);
rz_analysis_op_fini(&aop);
goto beach;
}
RzAsmOp op = { 0 };
rz_asm_disassemble(core->rasm, &op, buf + addrbytes * idx,
core->blocksize - addrbytes * idx);
hit->code = rz_str_dup(rz_strbuf_get(&op.buf_asm));
rz_asm_op_fini(&op);
rz_analysis_op_fini(&aop);
idx = (matchcount) ? tidx + 1 : idx + 1;
matchcount = 0;
rz_list_append(hits, hit);
continue;
}
rz_analysis_op_fini(&aop);
idx++; // TODO: honor mininstrsz
continue;
} else if (mode == 'e') {
RzAnalysisOp aop = { 0 };
rz_analysis_op_init(&aop);
if (rz_analysis_op(core->analysis, &aop, addr, buf + idx, 15, RZ_ANALYSIS_OP_MASK_ESIL) < 1) {
idx++; // TODO: honor mininstrsz
rz_analysis_op_fini(&aop);
continue;
}
// opsz = aop.size;
opst = rz_str_dup(rz_strbuf_get(&aop.esil));
rz_analysis_op_fini(&aop);
} else {
RzAsmOp op = { 0 };
if (!(len = rz_asm_disassemble(
core->rasm, &op,
buf + addrbytes * idx,
core->blocksize - addrbytes * idx))) {
idx = (matchcount) ? tidx + 1 : idx + 1;
matchcount = 0;
rz_asm_op_fini(&op);
continue;
}
// opsz = op.size;
opst = rz_str_dup(rz_strbuf_get(&op.buf_asm));
rz_asm_op_fini(&op);
}
if (opst) {
matches = strcmp(opst, "invalid") && strcmp(opst, "unaligned");
}
if (matches && tokens[matchcount]) {
if (mode == 'a') { // check for case sensitive
matches = !rz_str_ncasecmp(opst, tokens[matchcount], strlen(tokens[matchcount]));
} else if (!regexp) {
matches = strstr(opst, tokens[matchcount]) != NULL;
} else {
rx = rz_regex_new(tokens[matchcount], RZ_REGEX_EXTENDED, 0, NULL);
RzPVector *tmp_m = rz_regex_match_first(rx, opst, RZ_REGEX_ZERO_TERMINATED, 0, RZ_REGEX_DEFAULT);
matches = (!rz_pvector_empty(tmp_m) && tmp_m != NULL) ? 1 : 0;
rz_regex_free(rx);
rz_pvector_free(tmp_m);
}
}
if (align > 1 && addr % align) {
matches = false;
}
if (matches) {
code = rz_str_appendf(code, "%s; ", opst);
if (matchcount == tokcount - 1) {
if (tokcount == 1) {
tidx = idx;
}
if (!(hit = rz_core_asm_hit_new())) {
rz_list_purge(hits);
RZ_FREE(hits);
goto beach;
}
hit->addr = tokcount == 1 ? addr : tidx;
hit->len = idx + len - tidx;
if (hit->len == -1) {
rz_core_asm_hit_free(hit);
goto beach;
}
code[strlen(code) - 2] = 0;
hit->code = rz_str_dup(code);
rz_list_append(hits, hit);
RZ_FREE(code);
matchcount = 0;
idx = tidx + 1;
if (maxhits) {
count++;
if (count >= maxhits) {
// eprintf ("Error: search.maxhits reached\n");
goto beach;
}
}
} else if (!matchcount) {
tidx = idx;
matchcount++;
idx += len;
} else {
matchcount++;
idx += len;
}
} else {
if (everyByte) {
idx = matchcount ? tidx + 1 : idx + 1;
} else {
idx += RZ_MAX(1, len);
}
RZ_FREE(code);
matchcount = 0;
}
RZ_FREE(opst);
}
}
rz_cons_break_pop();
rz_asm_set_pc(core->rasm, toff);
beach:
free(inp);
free(buf);
free(ptr);
free(code);
RZ_FREE(opst);
rz_cons_break_pop();
return hits;
}
static void add_hit_to_sorted_hits(RzList /*<RzCoreAsmHit *>*/ *hits, ut64 addr, int len, ut8 is_valid) {
RzCoreAsmHit *hit = rz_core_asm_hit_new();
if (hit) {
RZ_LOG_DEBUG("*** Inserting instruction (valid?: %d): instr_addr: 0x%" PFMT64x " instr_len: %d\n", is_valid, addr, len);
hit->addr = addr;
hit->len = len;
hit->valid = is_valid;
hit->code = NULL;
rz_list_add_sorted(hits, hit, ((RzListComparator)coreasm_address_comparator), NULL);
}
}
static void add_hit_to_hits(RzList /*<RzCoreAsmHit *>*/ *hits, ut64 addr, int len, ut8 is_valid) {
RzCoreAsmHit *hit = rz_core_asm_hit_new();
if (hit) {
RZ_LOG_DEBUG("*** Inserting instruction (valid?: %d): instr_addr: 0x%" PFMT64x " instr_len: %d\n", is_valid, addr, len);
hit->addr = addr;
hit->len = len;
hit->valid = is_valid;
hit->code = NULL;
if (!rz_list_append(hits, hit)) {
free(hit);
}
}
}
static int prune_hits_in_addr_range(RzList /*<RzCoreAsmHit *>*/ *hits, ut64 addr, ut64 len, ut8 is_valid) {
RzCoreAsmHit hit = RZ_EMPTY;
hit.addr = addr;
hit.len = len;
hit.valid = is_valid;
return prune_hits_in_hit_range(hits, &hit);
}
static int prune_hits_in_hit_range(RzList /*<RzCoreAsmHit *>*/ *hits, RzCoreAsmHit *hit) {
RzListIter *iter, *iter_tmp;
RzCoreAsmHit *to_check_hit;
int result = 0;
ut64 start_range, end_range;
if (!hit || !hits) {
return 0;
}
start_range = hit->addr;
end_range = hit->addr + hit->len;
rz_list_foreach_safe (hits, iter, iter_tmp, to_check_hit) {
if (to_check_hit && is_hit_inrange(to_check_hit, start_range, end_range)) {
RZ_LOG_DEBUG("Found hit that clashed (start: 0x%" PFMT64x
" - end: 0x%" PFMT64x " ), 0x%" PFMT64x " len: %d (valid: %d 0x%" PFMT64x
" - 0x%" PFMT64x ")\n",
start_range, end_range, to_check_hit->addr,
to_check_hit->len, to_check_hit->valid, to_check_hit->addr,
to_check_hit->addr + to_check_hit->len);
// XXX - could this be a valid decode instruction we are deleting?
rz_list_delete(hits, iter);
// iter->data = NULL;
to_check_hit = NULL;
result++;
}
}
return result;
}
static RzCoreAsmHit *find_addr(RzList /*<RzCoreAsmHit *>*/ *hits, ut64 addr) {
// Find an address in the list of hits
RzListIter *addr_iter = NULL;
RzCoreAsmHit dummy_value;
dummy_value.addr = addr;
addr_iter = rz_list_find(hits, &dummy_value, ((RzListComparator)coreasm_address_comparator), NULL);
return rz_list_iter_get_data(addr_iter);
}
static int handle_forward_disassemble(RzCore *core, RzList /*<RzCoreAsmHit *>*/ *hits, ut8 *buf, ut64 len, ut64 current_buf_pos, ut64 current_instr_addr, ut64 end_addr) {
RzCoreAsmHit *hit = NULL, *found_addr = NULL;
// forward disassemble from the current instruction up to the end address
ut64 temp_instr_addr = current_instr_addr;
ut64 tmp_current_buf_pos = current_buf_pos;
ut64 start_range = current_instr_addr;
ut64 end_range = end_addr;
ut64 temp_instr_len = 0;
ut64 start = 0, end = 0;
ut8 is_valid = false;
if (end_addr < current_instr_addr) {
return end_addr;
}
rz_asm_set_pc(core->rasm, current_instr_addr);
while (tmp_current_buf_pos < len && temp_instr_addr < end_addr) {
temp_instr_len = len - tmp_current_buf_pos;
RZ_LOG_DEBUG("Current position: %" PFMT64d " instr_addr: 0x%" PFMT64x "\n", tmp_current_buf_pos, temp_instr_addr);
RzAsmOp op = { 0 };
temp_instr_len = rz_asm_disassemble(core->rasm, &op, buf + tmp_current_buf_pos, temp_instr_len);
rz_asm_op_fini(&op);
if (temp_instr_len == 0) {
is_valid = false;
temp_instr_len = 1;
} else {
is_valid = true;
}
// check to see if addr exits
found_addr = find_addr(hits, temp_instr_addr);
start = temp_instr_addr;
end = temp_instr_addr + temp_instr_len;
if (!found_addr) {
add_hit_to_sorted_hits(hits, temp_instr_addr, temp_instr_len, is_valid);
} else if (is_valid && !found_addr->valid && is_addr_in_range(start, end, start_range, end_range)) {
ut32 prune_results = 0;
prune_results = prune_hits_in_addr_range(hits, temp_instr_addr, temp_instr_len, is_valid);
add_hit_to_sorted_hits(hits, temp_instr_addr, temp_instr_len, is_valid);
if (prune_results) {
rz_list_add_sorted(hits, hit, ((RzListComparator)coreasm_address_comparator), NULL);
RZ_LOG_DEBUG("Pruned %u hits from list in fwd sweep.\n", prune_results);
} else {
RZ_FREE(hit);
}
}
temp_instr_addr += temp_instr_len;
tmp_current_buf_pos += temp_instr_len;
}
return temp_instr_addr;
}
static int is_addr_in_range(ut64 start, ut64 end, ut64 start_range, ut64 end_range) {
int result = false;
if (start == start_range) {
return true;
}
if (start < end && start_range < end_range) {
// ez cases
if (start_range <= start && start < end_range) {
result = true;
} else if (start_range < end && end < end_range) {
result = true;
} else if (start <= start_range && end_range < end) {
result = true;
}
// XXX - these cases need to be tested
// (long long) start_range < 0 < end_range
} else if (start_range > end_range) {
if (start < end) {
if (start < end_range) {
result = true;
} else if (end <= end_range) {
result = true;
} else if (start_range <= start) {
result = true;
} else if (start_range < end) {
result = true;
}
// (long long) start < 0 < end
} else {
if (end < end_range) {
result = true;
} else if (end <= end_range) {
result = true;
} else if (start_range <= start) {
result = true;
}
}
// XXX - these cases need to be tested
// (long long) start < 0 < end
} else if (start_range < end_range) {
if (start < end_range) {
result = true;
} else if (start <= start_range) {
result = true;
} else if (start_range < end) {
result = true;
}
}
return result;
}
static int is_hit_inrange(RzCoreAsmHit *hit, ut64 start_range, ut64 end_range) {
int result = false;
if (hit) {
result = is_addr_in_range(hit->addr,
hit->addr + hit->len,
start_range, end_range);
}
return result;
}
RZ_API RzList /*<RzCoreAsmHit *>*/ *rz_core_asm_bwdisassemble(RzCore *core, ut64 addr, int n, int len) {
// if (n > core->blocksize) n = core->blocksize;
ut64 at;
ut32 idx = 0, hit_count;
int numinstr, asmlen, ii;
const int addrbytes = core->io->addrbytes;
RzAsmCode *c;
RzList *hits = rz_core_asm_hit_list_new();
if (!hits) {
return NULL;
}
len = RZ_MIN(len - len % addrbytes, addrbytes * addr);
if (len < 1) {
rz_list_free(hits);
return NULL;
}
ut8 *buf = (ut8 *)malloc(len);
if (!buf) {
rz_list_free(hits);
return NULL;
} else if (!hits) {
free(buf);
return NULL;
}
if (!rz_io_read_at(core->io, addr - len / addrbytes, buf, len)) {
rz_list_free(hits);
free(buf);
return NULL;
}
for (idx = addrbytes; idx < len; idx += addrbytes) {
if (rz_cons_is_breaked()) {
break;
}
c = rz_asm_mdisassemble(core->rasm, buf + len - idx, idx);
if (strstr(c->assembly, "invalid") || strstr(c->assembly, ".byte")) {
rz_asm_code_free(c);
continue;
}
numinstr = 0;
asmlen = strlen(c->assembly);
for (ii = 0; ii < asmlen; ii++) {
if (c->assembly[ii] == '\n') {
++numinstr;
}
}
rz_asm_code_free(c);
if (numinstr >= n || idx > 16 * n) { // assume average instruction length <= 16
break;
}
}
at = addr - idx / addrbytes;
rz_asm_set_pc(core->rasm, at);
for (hit_count = 0; hit_count < n; hit_count++) {
RzAsmOp op = { 0 };
int instrlen = rz_asm_disassemble(core->rasm, &op,
buf + len - addrbytes * (addr - at), addrbytes * (addr - at));
add_hit_to_hits(hits, at, instrlen, true);
at += instrlen;
rz_asm_op_fini(&op);
}
free(buf);
return hits;
}
static RzList /*<RzCoreAsmHit *>*/ *rz_core_asm_back_disassemble_all(RzCore *core, ut64 addr, ut64 len, ut64 max_hit_count, ut32 extra_padding) {
RzList *hits = rz_core_asm_hit_list_new();
RzCoreAsmHit dummy_value;
RzCoreAsmHit *hit = NULL;
ut8 *buf = (ut8 *)malloc(len + extra_padding);
int current_instr_len = 0;
ut64 current_instr_addr = addr,
current_buf_pos = len - 1,
hit_count = 0;
memset(&dummy_value, 0, sizeof(RzCoreAsmHit));
if (!hits || !buf) {
if (hits) {
rz_list_purge(hits);
free(hits);
}
free(buf);
return NULL;
}
if (!rz_io_read_at(core->io, addr - (len + extra_padding), buf, len + extra_padding)) {
rz_list_purge(hits);
free(hits);
free(buf);
return NULL;
}
if (len == 0) {
return hits;
}
do {
if (rz_cons_is_breaked()) {
break;
}
// reset assembler
rz_asm_set_pc(core->rasm, current_instr_addr);
current_instr_len = len - current_buf_pos + extra_padding;
RZ_LOG_DEBUG("current_buf_pos: 0x%" PFMT64x ", current_instr_len: %d\n", current_buf_pos, current_instr_len);
RzAsmOp op = { 0 };
current_instr_len = rz_asm_disassemble(core->rasm, &op, buf + current_buf_pos, current_instr_len);
rz_asm_op_fini(&op);
hit = rz_core_asm_hit_new();
hit->addr = current_instr_addr;
hit->len = current_instr_len;
hit->code = NULL;
rz_list_add_sorted(hits, hit, ((RzListComparator)coreasm_address_comparator), NULL);
current_buf_pos--;
current_instr_addr--;
hit_count++;
} while (((int)current_buf_pos >= 0) && (int)(len - current_buf_pos) >= 0 && hit_count <= max_hit_count);
free(buf);
return hits;
}
static RzList /*<RzCoreAsmHit *>*/ *rz_core_asm_back_disassemble(RzCore *core, ut64 addr, int len, ut64 max_hit_count, ut8 disassmble_each_addr, ut32 extra_padding) {
RzList *hits;
ut8 *buf = NULL;
ut8 max_invalid_b4_exit = 4,
last_num_invalid = 0;
int current_instr_len = 0;
ut64 current_instr_addr = addr,
current_buf_pos = 0,
next_buf_pos = len;
RzCoreAsmHit dummy_value;
ut32 hit_count = 0;
if (disassmble_each_addr) {
return rz_core_asm_back_disassemble_all(core, addr, len, max_hit_count, extra_padding + 1);
}
hits = rz_core_asm_hit_list_new();
buf = malloc(len + extra_padding);
if (!hits || !buf) {
if (hits) {
rz_list_purge(hits);
free(hits);
}
free(buf);
return NULL;
}
if (!rz_io_read_at(core->io, (addr + extra_padding) - len, buf, len + extra_padding)) {
rz_list_purge(hits);
free(hits);
free(buf);
return NULL;
}
//
// XXX - This is a heavy handed approach without a
// an appropriate btree or hash table for storing
// hits, because are using:
// 1) Sorted RzList with many inserts and searches
// 2) Pruning hits to find the most optimal disassembly
// greedy approach
// 1) Consume previous bytes
// 1a) Instruction is invalid (incr current_instr_addr)
// 1b) Disasm is perfect
// 1c) Disasm is underlap (disasm(current_instr_addr, next_instr_addr - current_instr_addr) short some bytes)
// 1d) Disasm is overlap (disasm(current_instr_addr, next_instr_addr - current_instr_addr) over some bytes)
memset(&dummy_value, 0, sizeof(RzCoreAsmHit));
// disassemble instructions previous to current address, extra_padding can move the location of addr
// so we need to account for that with current_buf_pos
current_buf_pos = len - extra_padding - 1;
next_buf_pos = len + extra_padding - 1;
current_instr_addr = addr - 1;
do {
if (rz_cons_is_breaked()) {
break;
}
// reset assembler
rz_asm_set_pc(core->rasm, current_instr_addr);
current_instr_len = next_buf_pos - current_buf_pos;
RzAsmOp op = { 0 };
current_instr_len = rz_asm_disassemble(core->rasm, &op, buf + current_buf_pos, current_instr_len);
// disassembly invalid
if (current_instr_len == 0 || strstr(rz_strbuf_get(&op.buf_asm), "invalid")) {
if (current_instr_len == 0) {
current_instr_len = 1;
}
add_hit_to_sorted_hits(hits, current_instr_addr, current_instr_len, /* is_valid */ false);
hit_count++;
last_num_invalid++;
// disassembly perfect
} else if (current_buf_pos + current_instr_len == next_buf_pos) {
// i think this may be the only case where an invalid instruction will be
// added because handle_forward_disassemble and handle_disassembly_overlap
// are only called in cases where a valid instruction has been found.
// and they are lazy, since they purge the hit list
ut32 purge_results = 0;
ut8 is_valid = true;
RZ_LOG_DEBUG(" handling underlap case: current_instr_addr: 0x%" PFMT64x ".\n", current_instr_addr);
purge_results = prune_hits_in_addr_range(hits, current_instr_addr, current_instr_len, /* is_valid */ true);
if (purge_results) {
handle_forward_disassemble(core, hits, buf, len, current_buf_pos + current_instr_len, current_instr_addr + current_instr_len, addr);
hit_count = rz_list_length(hits);
}
add_hit_to_sorted_hits(hits, current_instr_addr, current_instr_len, is_valid);
// handle_forward_disassemble(core, hits, buf, len, current_buf_pos+current_instr_len, current_instr_addr+current_instr_len, addr/*end_addr*/);
hit_count++;
next_buf_pos = current_buf_pos;
last_num_invalid = 0;
// disassembly underlap
} else if (current_buf_pos + current_instr_len < next_buf_pos) {
prune_hits_in_addr_range(hits, current_instr_addr, current_instr_len, true);
add_hit_to_sorted_hits(hits, current_instr_addr, current_instr_len, true);
next_buf_pos = current_buf_pos;
handle_forward_disassemble(core, hits, buf, len - extra_padding, current_buf_pos + current_instr_len, current_instr_addr + current_instr_len, addr);
hit_count = rz_list_length(hits);
last_num_invalid = 0;
// disassembly overlap
} else if (current_buf_pos + current_instr_len > next_buf_pos) {
// ut64 value = handle_disassembly_overlap(core, hits, buf, len, current_buf_pos, current_instr_addr);
next_buf_pos = current_buf_pos;
hit_count = rz_list_length(hits);
last_num_invalid = 0;
}
rz_asm_op_fini(&op);
// walk backwards by one instruction
RZ_LOG_DEBUG(" current_instr_addr: 0x%" PFMT64x " current_instr_len: %d next_instr_addr: 0x%04" PFMT64x "\n",
current_instr_addr, current_instr_len, next_buf_pos);
RZ_LOG_DEBUG(" hit count: %d \n", hit_count);
current_instr_addr -= 1;
current_buf_pos -= 1;
if (hit_count >= max_hit_count &&
(last_num_invalid >= max_invalid_b4_exit || last_num_invalid == 0)) {
break;
}
} while (((int)current_buf_pos >= 0) && (int)(len - current_buf_pos) >= 0);
rz_asm_set_pc(core->rasm, addr);
free(buf);
return hits;
}
RZ_API RzList /*<RzCoreAsmHit *>*/ *rz_core_asm_back_disassemble_instr(RzCore *core, ut64 addr, int len, ut32 hit_count, ut32 extra_padding) {
// extra padding to allow for additional disassembly on border buffer cases
ut8 disassmble_each_addr = false;
return rz_core_asm_back_disassemble(core, addr, len, hit_count, disassmble_each_addr, extra_padding);
}
RZ_API RzList /*<RzCoreAsmHit *>*/ *rz_core_asm_back_disassemble_byte(RzCore *core, ut64 addr, int len, ut32 hit_count, ut32 extra_padding) {
// extra padding to allow for additional disassembly on border buffer cases
ut8 disassmble_each_addr = true;
return rz_core_asm_back_disassemble(core, addr, len, hit_count, disassmble_each_addr, extra_padding);
}
/* Compute the len and the starting address
* when disassembling `nb` opcodes backward. */
RZ_API ut32 rz_core_asm_bwdis_len(RzCore *core, int *instr_len, ut64 *start_addr, ut32 nb) {
ut32 instr_run = 0;
RzCoreAsmHit *hit;
RzListIter *iter = NULL;
// TODO if length of nb instructions is larger than blocksize
RzList *hits = rz_core_asm_bwdisassemble(core, core->offset, nb, core->blocksize);
if (instr_len) {
*instr_len = 0;
}
if (hits && rz_list_length(hits) > 0) {
hit = rz_list_first_val(hits);
if (start_addr) {
*start_addr = hit->addr;
}
rz_list_foreach (hits, iter, hit) {
instr_run += hit->len;
}
if (instr_len) {
*instr_len = instr_run;
}
}
rz_list_free(hits);
return instr_run;
}
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