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/*
american fuzzy lop++ - high-performance binary-only instrumentation
-------------------------------------------------------------------
Originally written by Andrew Griffiths <agriffiths@google.com> and
Michal Zalewski
TCG instrumentation and block chaining support by Andrea Biondo
<andrea.biondo965@gmail.com>
QEMU 3.1.1 port, TCG thread-safety, CompareCoverage and NeverZero
counters by Andrea Fioraldi <andreafioraldi@gmail.com>
Copyright 2015, 2016, 2017 Google Inc. All rights reserved.
Copyright 2019-2020 AFLplusplus Project. 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
This code is a shim patched into the separately-distributed source
code of QEMU 3.1.0. It leverages the built-in QEMU tracing functionality
to implement AFL-style instrumentation and to take care of the remaining
parts of the AFL fork server logic.
The resulting QEMU binary is essentially a standalone instrumentation
tool; for an example of how to leverage it for other purposes, you can
have a look at afl-showmap.c.
*/
#ifndef __AFL_QEMU_COMMON
#define __AFL_QEMU_COMMON
#include "../../config.h"
#include "../../include/cmplog.h"
#define PERSISTENT_DEFAULT_MAX_CNT 1000
#ifdef CPU_NB_REGS
#define AFL_REGS_NUM CPU_NB_REGS
#elif TARGET_ARM
#define AFL_REGS_NUM 16
#elif TARGET_AARCH64
#define AFL_REGS_NUM 32
#else
#define AFL_REGS_NUM 100
#endif
/* NeverZero */
#if (defined(__x86_64__) || defined(__i386__)) && defined(AFL_QEMU_NOT_ZERO)
#define INC_AFL_AREA(loc) \
asm volatile( \
"incb (%0, %1, 1)\n" \
"adcb $0, (%0, %1, 1)\n" \
: /* no out */ \
: "r"(afl_area_ptr), "r"(loc) \
: "memory", "eax")
#else
#define INC_AFL_AREA(loc) afl_area_ptr[loc]++
#endif
typedef void (*afl_persistent_hook_fn)(uint64_t *regs, uint64_t guest_base,
uint8_t *input_buf,
uint32_t input_buf_len);
/* Declared in afl-qemu-cpu-inl.h */
extern unsigned char *afl_area_ptr;
extern unsigned int afl_inst_rms;
extern abi_ulong afl_entry_point, afl_start_code, afl_end_code;
extern abi_ulong afl_persistent_addr;
extern abi_ulong afl_persistent_ret_addr;
extern u8 afl_compcov_level;
extern unsigned char afl_fork_child;
extern unsigned char is_persistent;
extern target_long persistent_stack_offset;
extern unsigned char persistent_first_pass;
extern unsigned char persistent_save_gpr;
extern uint64_t persistent_saved_gpr[AFL_REGS_NUM];
extern int persisent_retaddr_offset;
extern u8 * shared_buf;
extern u32 *shared_buf_len;
extern u8 sharedmem_fuzzing;
extern afl_persistent_hook_fn afl_persistent_hook_ptr;
extern __thread abi_ulong afl_prev_loc;
extern struct cmp_map *__afl_cmp_map;
extern __thread u32 __afl_cmp_counter;
void afl_setup(void);
void afl_forkserver(CPUState *cpu);
// void afl_debug_dump_saved_regs(void);
void afl_persistent_loop(void);
void afl_gen_tcg_plain_call(void *func);
void afl_float_compcov_log_32(target_ulong cur_loc, float32 arg1, float32 arg2,
void *status);
void afl_float_compcov_log_64(target_ulong cur_loc, float64 arg1, float64 arg2,
void *status);
void afl_float_compcov_log_80(target_ulong cur_loc, floatx80 arg1,
floatx80 arg2);
/* Check if an address is valid in the current mapping */
static inline int is_valid_addr(target_ulong addr) {
int flags;
target_ulong page;
page = addr & TARGET_PAGE_MASK;
flags = page_get_flags(page);
if (!(flags & PAGE_VALID) || !(flags & PAGE_READ)) return 0;
return 1;
}
#endif
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