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ptdecode.c
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ptdecode.c
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/*
WinAFL - Intel PT decoding
------------------------------------------------
Written and maintained by Ivan Fratric <ifratric@google.com>
Copyright 2016 Google Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include "windows.h"
#include "intel-pt.h"
#include "pt_cpu.h"
#include "pt_cpuid.h"
#include "pt_opcodes.h"
#include "pt_retstack.h"
#include "pt_block_decoder.h"
#include "types.h"
#include "config.h"
#include "debug.h"
#include "winaflpt.h"
#include "ptdecode.h"
#define PPT_EXT 0xFF
uint32_t previous_offset;
uint64_t previous_ip;
extern address_range* coverage_ip_ranges;
extern size_t num_ip_ranges;
static address_range* current_range;
extern u8 *trace_bits;
#define MAX_TRACELET_SIZE 100 // just a hint, the tracelets could end up larger
#define MIN_TRACELET_SIZE 20 // just a hint, the tracelets could end up smaller
unsigned char opc_lut[] = {
0x02, 0x08, 0xff, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x06, 0x09, 0x12,
0x09, 0x07, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x0f, 0x09, 0x12, 0x09, 0x05, 0x09, 0x12,
0x09, 0x08, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x06, 0x09, 0x12,
0x09, 0x07, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x05, 0x09, 0x12,
0x09, 0x08, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x06, 0x09, 0x12,
0x09, 0x07, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x11, 0x09, 0x12, 0x09, 0x05, 0x09, 0x12,
0x09, 0x08, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x06, 0x09, 0x12,
0x09, 0x07, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x05, 0x09, 0x12,
0x09, 0x08, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x06, 0x09, 0x12,
0x09, 0x07, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x0b, 0x09, 0x12, 0x09, 0x05, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x08, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x06, 0x09, 0x12,
0x09, 0x07, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x05, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12,
0x09, 0x00, 0x09, 0x12, 0x09, 0x00, 0x09, 0x12
};
unsigned char ext_lut[] = {
0x00, 0x00, 0x00, 0x0e, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x1a, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x18, 0x04, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x1a, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x0c, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x16, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x03, 0x13, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x1a, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x19, 0x0a, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x1a, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x17, 0xff, 0x00, 0x00, 0x00, 0x00,
0x0d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x16, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
unsigned char opc_size_lut[] = {
0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x08, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x03, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x03, 0x01, 0x01,
0x01, 0x03, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x03, 0x01, 0x01,
0x01, 0x05, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x05, 0x01, 0x01,
0x01, 0x05, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x02, 0x01, 0x01, 0x01, 0x05, 0x01, 0x01,
0x01, 0x07, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x07, 0x01, 0x01,
0x01, 0x07, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x07, 0x01, 0x01,
0x01, 0x07, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x07, 0x01, 0x01,
0x01, 0x07, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x02, 0x01, 0x01, 0x01, 0x07, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x09, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x09, 0x01, 0x01,
0x01, 0x09, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x09, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01,
0x01, 0x00, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01
};
unsigned char ext_size_lut[] = {
0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x04, 0x02, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x10, 0x02, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x08, 0x08, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x0a, 0x01, 0x00, 0x00, 0x00, 0x00,
0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
unsigned char psb[16] = {
0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82,
0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82
};
static unsigned char psb_and_psbend[18] = {
0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82,
0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82,
0x02, 0x23
};
typedef struct decoder_state_t {
uint64_t query_ip;
uint64_t block_ip;
uint8_t mode;
} decoder_state;
typedef struct tracelet_cache_node_t {
uint64_t hash;
size_t size;
struct tracelet_cache_node_t *hash_prev;
struct tracelet_cache_node_t *hash_next;
struct tracelet_cache_node_t *lru_prev;
struct tracelet_cache_node_t *lru_next;
decoder_state state_prev;
decoder_state state_next;
uint8_t stack_removed;
uint8_t stack_added;
uint64_t *stack_prev;
uint64_t *stack_next;
uint32_t tracelet_size;
unsigned char * tracelet;
uint32_t map_update_size;
uint32_t *map_offsets;
uint8_t *map_updates;
} tracelet_cache_node;
struct tracelet_cahe_t {
tracelet_cache_node **hashtable;
tracelet_cache_node *lru_first;
tracelet_cache_node *lru_last;
size_t size;
size_t num_entries;
size_t max_size;
size_t max_entries;
};
static struct tracelet_cahe_t tracelet_cache;
struct coverage_cache_t {
uint32_t index_buffer[MAP_SIZE];
// need + 2 for edge coverage
uint32_t map_offsets[MAP_SIZE + 2];
uint8_t counters[MAP_SIZE + 2];
uint32_t size;
};
void tracelet_coverage_init(struct coverage_cache_t *coverage_cache) {
memset(coverage_cache->index_buffer, 0, MAP_SIZE * sizeof(coverage_cache->index_buffer[0]));
coverage_cache->size = 0;
}
void tracelet_coverage_clear(struct coverage_cache_t *coverage_cache, int coverage_kind) {
if (!coverage_cache->size) return;
uint32_t from = 0;
uint32_t to = coverage_cache->size;
if (coverage_kind == COVERAGE_EDGE) {
// the first and the last value have special meaning
// in the case of edge coverage
from++;
to--;
}
for (uint32_t i = from; i < to; i++) {
coverage_cache->index_buffer[coverage_cache->map_offsets[i]] = 0;
}
coverage_cache->size = 0;
}
void tracelet_coverage_add_bb(struct coverage_cache_t *coverage_cache, uint32_t offset) {
offset = offset % MAP_SIZE;
if (coverage_cache->index_buffer[offset]) {
coverage_cache->counters[coverage_cache->index_buffer[offset] - 1]++;
} else {
coverage_cache->index_buffer[offset] = coverage_cache->size + 1;
coverage_cache->map_offsets[coverage_cache->size] = offset;
coverage_cache->counters[coverage_cache->size] = 1;
coverage_cache->size++;
}
}
void tracelet_coverage_add_edge(struct coverage_cache_t *coverage_cache, uint32_t offset) {
uint32_t edge;
// don't touch the global previous_offset while building the cache
// we'll update everything once the cache gets replayed
uint32_t previous_offset;
if (!coverage_cache->size) {
// store the first offset as the first value
coverage_cache->map_offsets[0] = offset;
coverage_cache->counters[0] = 0;
coverage_cache->size = 2;
} else {
previous_offset = coverage_cache->map_offsets[coverage_cache->size - 1];
edge = (offset ^ previous_offset) % MAP_SIZE;
if (coverage_cache->index_buffer[edge]) {
coverage_cache->counters[coverage_cache->index_buffer[edge]]++;
} else {
coverage_cache->index_buffer[edge] = coverage_cache->size - 1;
coverage_cache->map_offsets[coverage_cache->size - 1] = edge;
coverage_cache->counters[coverage_cache->size - 1] = 1;
coverage_cache->size++;
}
}
// always store the previous offset as the last value
previous_offset = offset >> 1;
coverage_cache->map_offsets[coverage_cache->size - 1] = previous_offset;
coverage_cache->counters[coverage_cache->size - 1] = 0;
}
static inline uint64_t djb2(unsigned char *data, size_t size) {
uint64_t hash = 5381;
for (size_t i = 0; i < size; i++) {
hash = (hash << 5) + hash + data[i];
}
return hash;
}
void tracelet_cache_init(size_t max_entries, size_t max_size) {
tracelet_cache.max_entries = max_entries;
tracelet_cache.max_size = max_size;
tracelet_cache.hashtable = (tracelet_cache_node **)calloc(max_entries, sizeof(tracelet_cache_node *));
tracelet_cache.lru_first = NULL;
tracelet_cache.lru_last = NULL;
tracelet_cache.size = 0;
tracelet_cache.num_entries = 0;
}
// sets the node as the least recently used
void cache_node_touch(tracelet_cache_node *node) {
// printf("accessing %p in cache\n", node);
if (!node->lru_prev) return; //already at the beginning
else node->lru_prev->lru_next = node->lru_next;
if (node->lru_next) node->lru_next->lru_prev = node->lru_prev;
else tracelet_cache.lru_last = node->lru_prev;
node->lru_prev = NULL;
node->lru_next = tracelet_cache.lru_first;
if (node->lru_next) node->lru_next->lru_prev = node;
tracelet_cache.lru_first = node;
}
void cache_node_remove(tracelet_cache_node *node) {
// printf("removing %p from cache\n", node);
if (node->lru_prev) node->lru_prev->lru_next = node->lru_next;
else tracelet_cache.lru_first = node->lru_next;
if (node->lru_next) node->lru_next->lru_prev = node->lru_prev;
else tracelet_cache.lru_last = node->lru_prev;
if (node->hash_prev) node->hash_prev->hash_next = node->hash_next;
else tracelet_cache.hashtable[node->hash % tracelet_cache.max_entries] = node->hash_next;
if (node->hash_next) node->hash_next->hash_prev = node->hash_prev;
tracelet_cache.num_entries--;
tracelet_cache.size -= node->size;
free(node);
}
void cache_remove_lru() {
tracelet_cache_node *node = tracelet_cache.lru_last;
if (node) cache_node_remove(node);
}
void cache_node_add(tracelet_cache_node *node) {
// printf("adding %p to cache\n", node);
while (tracelet_cache.num_entries >= tracelet_cache.max_entries) cache_remove_lru();
while ((tracelet_cache.size + node->size) >= tracelet_cache.max_size) cache_remove_lru();
tracelet_cache_node *prev_first;
prev_first = tracelet_cache.hashtable[node->hash % tracelet_cache.max_entries];
tracelet_cache.hashtable[node->hash % tracelet_cache.max_entries] = node;
node->hash_prev = NULL;
node->hash_next = prev_first;
if (prev_first) prev_first->hash_prev = node;
prev_first = tracelet_cache.lru_first;
tracelet_cache.lru_first = node;
node->lru_prev = NULL;
node->lru_next = prev_first;
if (prev_first) prev_first->lru_prev = node;
else tracelet_cache.lru_last = node;
tracelet_cache.num_entries++;
tracelet_cache.size += node->size;
}
tracelet_cache_node *cache_find_node(uint64_t hash, decoder_state *state, unsigned char *tracelet, size_t tracelet_size, struct pt_retstack *retstack) {
tracelet_cache_node *node = tracelet_cache.hashtable[hash % tracelet_cache.max_entries];
while (node) {
if ((node->hash == hash) &&
(node->state_prev.block_ip == state->block_ip) &&
(node->state_prev.query_ip == state->query_ip) &&
(node->state_prev.mode == state->mode) &&
(node->tracelet_size == tracelet_size) &&
(memcmp(node->tracelet, tracelet, tracelet_size) == 0))
{
uint8_t top = retstack->top;
size_t i;
for (i = 0; i < node->stack_removed; i++) {
if (top == retstack->bottom) break;
top = (!top ? pt_retstack_size : top - 1);
if (retstack->stack[top] != node->stack_prev[i]) break;
}
if (i == node->stack_removed) return node; // finally
}
node = node->hash_next;
}
return NULL;
}
void dump_lut(unsigned char *lut, char *lutname) {
printf("unsigned char %s[] = {\n", lutname);
for (int i = 0; i<16; i++) {
printf(" ");
for (int j = 0; j<16; j++) {
printf("%02x", lut[i * 16 + j]);
if (j != 15) printf(", ");
}
if (i != 15) printf(",\n");
else printf("\n");
}
printf("}; \n\n");
}
// function that was used to build the lookup tables for the packet decoder
void build_luts() {
for (int i = 0; i<256; i++) {
opc_lut[i] = ppt_invalid;
}
for (int i = 0; i<256; i++) {
ext_lut[i] = ppt_invalid;
}
for (int i = 0; i<256; i++) {
opc_size_lut[i] = 0;
ext_size_lut[i] = 0;
}
//ext packets
opc_lut[pt_opc_ext] = PPT_EXT;
opc_size_lut[pt_opc_ext] = 1; // not really important
//pad packet
opc_lut[pt_opc_pad] = ppt_pad;
opc_size_lut[pt_opc_pad] = 1;
//tip packet
for (int i = 0; i<8; i++) {
unsigned char opcode = (unsigned char)((i << 5) + 0xd);
if (i == 0) {
opc_lut[opcode] = ppt_tip;
opc_size_lut[opcode] = 1;
}
else if (i == 1) {
opc_lut[opcode] = ppt_tip;
opc_size_lut[opcode] = 1 + 2;
}
else if (i == 2) {
opc_lut[opcode] = ppt_tip;
opc_size_lut[opcode] = 1 + 4;
}
else if ((i == 3) || (i == 4)) {
opc_lut[opcode] = ppt_tip;
opc_size_lut[opcode] = 1 + 6;
}
else if (i == 6) {
opc_lut[opcode] = ppt_tip;
opc_size_lut[opcode] = 1 + 8;
}
}
//tip.pge packet
for (int i = 0; i<8; i++) {
unsigned char opcode = (unsigned char)((i << 5) + 0x11);
if (i == 0) {
opc_lut[opcode] = ppt_tip_pge;
opc_size_lut[opcode] = 1;
}
else if (i == 1) {
opc_lut[opcode] = ppt_tip_pge;
opc_size_lut[opcode] = 1 + 2;
}
else if (i == 2) {
opc_lut[opcode] = ppt_tip_pge;
opc_size_lut[opcode] = 1 + 4;
}
else if ((i == 3) || (i == 4)) {
opc_lut[opcode] = ppt_tip_pge;
opc_size_lut[opcode] = 1 + 6;
}
else if (i == 6) {
opc_lut[opcode] = ppt_tip_pge;
opc_size_lut[opcode] = 1 + 8;
}
}
//tip.pgd packet
for (int i = 0; i<8; i++) {
unsigned char opcode = (unsigned char)((i << 5) + 0x1);
if (i == 0) {
opc_lut[opcode] = ppt_tip_pgd;
opc_size_lut[opcode] = 1;
}
else if (i == 1) {
opc_lut[opcode] = ppt_tip_pgd;
opc_size_lut[opcode] = 1 + 2;
}
else if (i == 2) {
opc_lut[opcode] = ppt_tip_pgd;
opc_size_lut[opcode] = 1 + 4;
}
else if ((i == 3) || (i == 4)) {
opc_lut[opcode] = ppt_tip_pgd;
opc_size_lut[opcode] = 1 + 6;
}
else if (i == 6) {
opc_lut[opcode] = ppt_tip_pgd;
opc_size_lut[opcode] = 1 + 8;
}
}
//fup packet
for (int i = 0; i<8; i++) {
unsigned char opcode = (unsigned char)((i << 5) + 0x1d);
if (i == 0) {
opc_lut[opcode] = ppt_fup;
opc_size_lut[opcode] = 1;
}
else if (i == 1) {
opc_lut[opcode] = ppt_fup;
opc_size_lut[opcode] = 1 + 2;
}
else if (i == 2) {
opc_lut[opcode] = ppt_fup;
opc_size_lut[opcode] = 1 + 4;
}
else if ((i == 3) || (i == 4)) {
opc_lut[opcode] = ppt_fup;
opc_size_lut[opcode] = 1 + 6;
}
else if (i == 6) {
opc_lut[opcode] = ppt_fup;
opc_size_lut[opcode] = 1 + 8;
}
}
//mode packet
opc_lut[pt_opc_mode] = ppt_mode;
opc_size_lut[pt_opc_mode] = 2;
//tsc packet
opc_lut[pt_opc_tsc] = ppt_tsc;
opc_size_lut[pt_opc_tsc] = 8;
//mtc packet
opc_lut[pt_opc_mtc] = ppt_mtc;
opc_size_lut[pt_opc_mtc] = 2;
//cyc packet
for (int i = 0; i<64; i++) {
unsigned char opcode = (unsigned char)((i << 2) + 0x3);
opc_lut[opcode] = ppt_cyc;
opc_size_lut[opcode] = 1;
}
//tnt packets
for (int i = 1; i <= 6; i++) {
for (int bits = 0; bits<(1 << i); bits++) {
unsigned char opcode = (unsigned char)((1 << (i + 1)) + (bits << 1));
opc_lut[opcode] = ppt_tnt_8;
opc_size_lut[opcode] = 1;
}
}
//////extensions///////
//psb packet
ext_lut[pt_ext_psb] = ppt_psb;
ext_size_lut[pt_ext_psb] = 16;
//long tnt packet
ext_lut[pt_ext_tnt_64] = ppt_tnt_64;
ext_size_lut[pt_ext_tnt_64] = 8;
//pip packet
ext_lut[pt_ext_pip] = ppt_pip;
ext_size_lut[pt_ext_pip] = 8;
//ovf packet
ext_lut[pt_ext_ovf] = ppt_ovf;
ext_size_lut[pt_ext_ovf] = 2;
//psbend packet
ext_lut[pt_ext_psbend] = ppt_psbend;
ext_size_lut[pt_ext_psbend] = 2;
//cbr packet
ext_lut[pt_ext_cbr] = ppt_cbr;
ext_size_lut[pt_ext_cbr] = 4;
//tma packet
ext_lut[pt_ext_tma] = ppt_tma;
ext_size_lut[pt_ext_tma] = 8;
//stop packet
ext_lut[pt_ext_stop] = ppt_stop;
ext_size_lut[pt_ext_stop] = 2;
//vmcs packet
ext_lut[pt_ext_vmcs] = ppt_vmcs;
ext_size_lut[pt_ext_vmcs] = 8;
//exstop packet
ext_lut[pt_ext_exstop] = ppt_exstop;
ext_size_lut[pt_ext_exstop] = 2;
//exstop-ip packet
ext_lut[pt_ext_exstop_ip] = ppt_exstop;
ext_size_lut[pt_ext_exstop_ip] = 2;
//mwait packet
ext_lut[pt_ext_mwait] = ppt_mwait;
ext_size_lut[pt_ext_mwait] = 10;
//pwre packet
ext_lut[pt_ext_pwre] = ppt_pwre;
ext_size_lut[pt_ext_pwre] = 4;
//pwrx packet
ext_lut[pt_ext_pwrx] = ppt_pwrx;
ext_size_lut[pt_ext_pwrx] = 8;
//ptw packet
for (int i = 0; i<2; i++) {
for (int j = 0; j<2; j++) {
unsigned char opcode = (unsigned char)((i << 7) + (j << 5) + 0x12);
ext_lut[opcode] = ppt_ptw;
if (j == 0) {
ext_size_lut[opcode] = 6;
}
else if (j == 1) {
ext_size_lut[opcode] = 10;
}
}
}
//ext2
ext_lut[pt_ext_ext2] = PPT_EXT;
ext_size_lut[pt_ext_ext2] = 1; // not really important
dump_lut(opc_lut, "opc_lut");
dump_lut(ext_lut, "ext_lut");
dump_lut(opc_size_lut, "opc_size_lut");
dump_lut(ext_size_lut, "ext_size_lut");
}
// sign extend
inline static uint64_t sext(uint64_t val, uint8_t sign) {
uint64_t signbit, mask;
signbit = 1ull << (sign - 1);
mask = ~0ull << sign;
return val & signbit ? val | mask : val & ~mask;
}
// finds the next psb packet in the data buffer
bool findpsb(unsigned char **data, size_t *size) {
if (*size < 16) return false;
if (memcmp(*data, psb, sizeof(psb)) == 0) return true;
for (size_t i = 0; i < (*size - sizeof(psb) - 1); i++) {
if (((*data)[i] == psb[0]) && ((*data)[i+1] == psb[1])) {
if (memcmp((*data) + i, psb, sizeof(psb)) == 0) {
*data = *data + i;
*size = *size - i;
return true;
}
}
}
return false;
}
// checks if the IP address is in one of the modules we are interested in
// and updates the coverage map
inline static int update_coverage_map(uint64_t next_ip, int coverage_kind) {
uint32_t offset;
if (next_ip < current_range->start) {
do {
current_range--;
} while (next_ip < current_range->start);
} else if (next_ip > current_range->end) {
do {
current_range++;
} while (next_ip > current_range->end);
}
if (!current_range->collect) return 0;
// printf("ip: %p\n", (void*)next_ip);
offset = (uint32_t)(next_ip - current_range->start);
switch (coverage_kind) {
case COVERAGE_BB:
trace_bits[offset % MAP_SIZE]++;
break;
case COVERAGE_EDGE:
trace_bits[(offset ^ previous_offset) % MAP_SIZE]++;
previous_offset = offset >> 1;
break;
}
return 1;
}
// checks if the IP address is in one of the modules we are interested in
// and updates the coverage_cache datastructure
inline static int update_coverage_cache(struct coverage_cache_t *coverage_cache,
uint64_t next_ip, int coverage_kind)
{
uint32_t offset;
if (next_ip < current_range->start) {
do {
current_range--;
} while (next_ip < current_range->start);
}
else if (next_ip > current_range->end) {
do {
current_range++;
} while (next_ip > current_range->end);
}
if (!current_range->collect) return 0;
// printf("ip: %p\n", (void*)next_ip);
offset = (uint32_t)(next_ip - current_range->start);
switch (coverage_kind) {
case COVERAGE_BB:
tracelet_coverage_add_bb(coverage_cache, offset);
break;
case COVERAGE_EDGE:
tracelet_coverage_add_edge(coverage_cache, offset);
break;
}
return 1;
}
// gets the opcode and the size of the next packet in the trace buffer
static inline int get_next_opcode(unsigned char **data_p, size_t *size_p,
unsigned char *opcode_p, unsigned char *opcodesize_p)
{
unsigned char *data = *data_p;
size_t size = *size_p;
unsigned char opcode = opc_lut[*data];
unsigned char opcodesize = opc_size_lut[*data];
// handle extensions
if(opcode == PPT_EXT) {
if(size < 2) return 0;
opcode = ext_lut[*(data+1)];
opcodesize = ext_size_lut[*(data+1)];
// second-level extension
if(opcode == PPT_EXT) {
if(size < 3) return 0;
// currently there is only one possibility
if((*(data+2)) == 0x88) {
opcode = ppt_mnt;
opcodesize = 11;
} else {
opcode = ppt_invalid;
opcodesize = 0;
}
}
} else if(opcode == ppt_cyc) {
// special handling for cyc packets since
// they don't have a predetermined size
if(*data & 4) {
opcodesize = 2;
while(1) {
if(size < opcodesize) return 0;
if(!((*(data + (opcodesize - 1))) & 1)) break;
opcodesize++;
}
}
}
if (size < opcodesize) return 0;
*opcode_p = opcode;
*opcodesize_p = opcodesize;
return 1;
}
static inline uint64_t decode_ip(unsigned char *data) {
uint64_t next_ip;
switch ((*data) >> 5) {
case 0:
next_ip = previous_ip;
break;
case 1:
next_ip = (previous_ip & 0xFFFFFFFFFFFF0000ULL) | *((uint16_t *)(data + 1));
break;
case 2:
next_ip = (previous_ip & 0xFFFFFFFF00000000ULL) | *((uint32_t *)(data + 1));
break;
case 3:
next_ip = sext(*((uint32_t *)(data + 1)) | ((uint64_t)(*((uint16_t *)(data + 5))) << 32), 48);
break;
case 4:
next_ip = (previous_ip & 0xFFFF000000000000ULL) | *((uint32_t *)(data + 1)) | ((uint64_t)(*((uint16_t *)(data + 5))) << 32);
break;
case 6:
next_ip = *((uint64_t *)(data + 1));
break;
}
previous_ip = next_ip;
return next_ip;
}
// returns the type of the first packet or ppt_invalid
int get_next_tracelet(unsigned char **data, size_t *size,
unsigned char **tracelet_data, size_t *tracelet_size)
{
unsigned char opcode;
unsigned char opcodesize;
unsigned char previous_opcode = ppt_invalid;
int ret = ppt_tnt_8;
while (*size) {
if (!get_next_opcode(data, size, &opcode, &opcodesize))
return ppt_invalid;
if (opcode == ppt_invalid) return ppt_invalid;
// printf("packet type: %d\n", opcode);
switch (opcode) {
case ppt_tnt_8:
case ppt_tnt_64:
// merge tiny tracelets
if (*tracelet_size > MIN_TRACELET_SIZE) {
// always cut before tnt preceeded by non-tnt
if (previous_opcode != ppt_invalid &&
previous_opcode != ppt_tnt_8 &&
previous_opcode != ppt_tnt_64)
{
return ret;
}
// cut very long streams of tnt packets
if (*tracelet_size > MAX_TRACELET_SIZE) {
return ret;
}
}
memcpy(*tracelet_data, *data, opcodesize);
*tracelet_data += opcodesize;
*tracelet_size += opcodesize;
*size -= opcodesize;
*data += opcodesize;
previous_opcode = opcode;
break;
case ppt_psb:
// let the caller know there is a psb in this tracelet
ret = ppt_psb;
case ppt_psbend:
case ppt_fup:
case ppt_tip:
case ppt_tip_pge:
case ppt_tip_pgd:
case ppt_ovf:
case ppt_mode:
// just copy these packets
memcpy(*tracelet_data, *data, opcodesize);
*tracelet_data += opcodesize;
*tracelet_size += opcodesize;
*size -= opcodesize;
*data += opcodesize;
previous_opcode = opcode;
break;
default:
// skip over all other packets
*size -= opcodesize;
*data += opcodesize;
break;
}
}
return ret;
}
// checks if the trace starts with the expected IP address
int check_trace_start(unsigned char *data, size_t size, uint64_t expected_ip) {
unsigned char opcode;
unsigned char opcodesize;
previous_ip = 0;
while (size) {
if (!get_next_opcode(&data, &size, &opcode, &opcodesize)) return 0;
switch (opcode) {
case ppt_tip_pge:
if (decode_ip(data) == expected_ip) return 1;
else return 0;
case ppt_fup:
case ppt_tip:
case ppt_tnt_8:
case ppt_tnt_64:
case ppt_tip_pgd:
case ppt_invalid:
return 0;
default:
break;
}
size -= opcodesize;
data += opcodesize;
}
return 0;
}
// fast decoder that decodes only tip (and related packets)
// and skips over the reset
void decode_trace_tip_fast(unsigned char *data, size_t size, int coverage_kind) {
uint64_t next_ip;
unsigned char opcode;
unsigned char opcodesize;
previous_offset = 0;
previous_ip = 0;
current_range = &(coverage_ip_ranges[0]);
if (size < sizeof(psb)) return;
if (!findpsb(&data, &size)) {
FATAL("No sync packets in trace\n");