/* udis86 - libudis86/udis86.c
*
* Copyright (c) 2002-2013 Vivek Thampi
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "udint.h"
#include "extern.h"
#include "decode.h"
#if !defined(__UD_STANDALONE__)
# if HAVE_STRING_H
# include <string.h>
# endif
#endif /* !__UD_STANDALONE__ */
static void ud_inp_init(struct ud *u);
/* =============================================================================
* ud_init
* Initializes ud_t object.
* =============================================================================
*/
extern void
ud_init(struct ud* u)
{
memset((void*)u, 0, sizeof(struct ud));
ud_set_mode(u, 16);
u->mnemonic = UD_Iinvalid;
ud_set_pc(u, 0);
#ifndef __UD_STANDALONE__
ud_set_input_file(u, stdin);
#endif /* __UD_STANDALONE__ */
ud_set_asm_buffer(u, u->asm_buf_int, sizeof(u->asm_buf_int));
}
/* =============================================================================
* ud_disassemble
* Disassembles one instruction and returns the number of
* bytes disassembled. A zero means end of disassembly.
* =============================================================================
*/
extern unsigned int
ud_disassemble(struct ud* u)
{
int len;
if (u->inp_end) {
return 0;
}
if ((len = ud_decode(u)) > 0) {
if (u->translator != NULL) {
u->asm_buf[0] = '\0';
u->translator(u);
}
}
return len;
}
/* =============================================================================
* ud_set_mode() - Set Disassemly Mode.
* =============================================================================
*/
extern void
ud_set_mode(struct ud* u, uint8_t m)
{
switch(m) {
case 16:
case 32:
case 64: u->dis_mode = m ; return;
default: u->dis_mode = 16; return;
}
}
/* =============================================================================
* ud_set_vendor() - Set vendor.
* =============================================================================
*/
extern void
ud_set_vendor(struct ud* u, unsigned v)
{
switch(v) {
case UD_VENDOR_INTEL:
u->vendor = v;
break;
case UD_VENDOR_ANY:
u->vendor = v;
break;
default:
u->vendor = UD_VENDOR_AMD;
}
}
/* =============================================================================
* ud_set_pc() - Sets code origin.
* =============================================================================
*/
extern void
ud_set_pc(struct ud* u, uint64_t o)
{
u->pc = o;
}
/* =============================================================================
* ud_set_syntax() - Sets the output syntax.
* =============================================================================
*/
extern void
ud_set_syntax(struct ud* u, void (*t)(struct ud*))
{
u->translator = t;
}
/* =============================================================================
* ud_insn() - returns the disassembled instruction
* =============================================================================
*/
const char*
ud_insn_asm(const struct ud* u)
{
return u->asm_buf;
}
/* =============================================================================
* ud_insn_offset() - Returns the offset.
* =============================================================================
*/
uint64_t
ud_insn_off(const struct ud* u)
{
return u->insn_offset;
}
/* =============================================================================
* ud_insn_hex() - Returns hex form of disassembled instruction.
* =============================================================================
*/
const char*
ud_insn_hex(struct ud* u)
{
u->insn_hexcode[0] = 0;
if (!u->error) {
unsigned int i;
const unsigned char *src_ptr = ud_insn_ptr(u);
char* src_hex;
src_hex = (char*) u->insn_hexcode;
/* for each byte used to decode instruction */
for (i = 0; i < ud_insn_len(u) && i < sizeof(u->insn_hexcode) / 2;
++i, ++src_ptr) {
sprintf(src_hex, "%02x", *src_ptr & 0xFF);
src_hex += 2;
}
}
return u->insn_hexcode;
}
/* =============================================================================
* ud_insn_ptr
* Returns a pointer to buffer containing the bytes that were
* disassembled.
* =============================================================================
*/
extern const uint8_t*
ud_insn_ptr(const struct ud* u)
{
return (u->inp_buf == NULL) ?
u->inp_sess : u->inp_buf + (u->inp_buf_index - u->inp_ctr);
}
/* =============================================================================
* ud_insn_len
* Returns the count of bytes disassembled.
* =============================================================================
*/
extern unsigned int
ud_insn_len(const struct ud* u)
{
return u->inp_ctr;
}
/* =============================================================================
* ud_insn_get_opr
* Return the operand struct representing the nth operand of
* the currently disassembled instruction. Returns NULL if
* there's no such operand.
* =============================================================================
*/
const struct ud_operand*
ud_insn_opr(const struct ud *u, unsigned int n)
{
if (n > 3 || u->operand[n].type == UD_NONE) {
return NULL;
} else {
return &u->operand[n];
}
}
/* =============================================================================
* ud_opr_is_sreg
* Returns non-zero if the given operand is of a segment register type.
* =============================================================================
*/
int
ud_opr_is_sreg(const struct ud_operand *opr)
{
return opr->type == UD_OP_REG &&
opr->base >= UD_R_ES &&
opr->base <= UD_R_GS;
}
/* =============================================================================
* ud_opr_is_sreg
* Returns non-zero if the given operand is of a general purpose
* register type.
* =============================================================================
*/
int
ud_opr_is_gpr(const struct ud_operand *opr)
{
return opr->type == UD_OP_REG &&
opr->base >= UD_R_AL &&
opr->base <= UD_R_R15;
}
/* =============================================================================
* ud_set_user_opaque_data
* ud_get_user_opaque_data
* Get/set user opaqute data pointer
* =============================================================================
*/
void
ud_set_user_opaque_data(struct ud * u, void* opaque)
{
u->user_opaque_data = opaque;
}
void*
ud_get_user_opaque_data(const struct ud *u)
{
return u->user_opaque_data;
}
/* =============================================================================
* ud_set_asm_buffer
* Allow the user to set an assembler output buffer. If `buf` is NULL,
* we switch back to the internal buffer.
* =============================================================================
*/
void
ud_set_asm_buffer(struct ud *u, char *buf, size_t size)
{
if (buf == NULL) {
ud_set_asm_buffer(u, u->asm_buf_int, sizeof(u->asm_buf_int));
} else {
u->asm_buf = buf;
u->asm_buf_size = size;
}
}
/* =============================================================================
* ud_set_sym_resolver
* Set symbol resolver for relative targets used in the translation
* phase.
*
* The resolver is a function that takes a uint64_t address and returns a
* symbolic name for the that address. The function also takes a second
* argument pointing to an integer that the client can optionally set to a
* non-zero value for offsetted targets. (symbol+offset) The function may
* also return NULL, in which case the translator only prints the target
* address.
*
* The function pointer maybe NULL which resets symbol resolution.
* =============================================================================
*/
void
ud_set_sym_resolver(struct ud *u, const char* (*resolver)(struct ud*,
uint64_t addr,
int64_t *offset))
{
u->sym_resolver = resolver;
}
/* =============================================================================
* ud_insn_mnemonic
* Return the current instruction mnemonic.
* =============================================================================
*/
enum ud_mnemonic_code
ud_insn_mnemonic(const struct ud *u)
{
return u->mnemonic;
}
/* =============================================================================
* ud_lookup_mnemonic
* Looks up mnemonic code in the mnemonic string table.
* Returns NULL if the mnemonic code is invalid.
* =============================================================================
*/
const char*
ud_lookup_mnemonic(enum ud_mnemonic_code c)
{
if (c < UD_MAX_MNEMONIC_CODE) {
return ud_mnemonics_str[c];
} else {
return NULL;
}
}
/*
* ud_inp_init
* Initializes the input system.
*/
static void
ud_inp_init(struct ud *u)
{
u->inp_hook = NULL;
u->inp_buf = NULL;
u->inp_buf_size = 0;
u->inp_buf_index = 0;
u->inp_curr = 0;
u->inp_ctr = 0;
u->inp_end = 0;
u->inp_peek = UD_EOI;
UD_NON_STANDALONE(u->inp_file = NULL);
}
/* =============================================================================
* ud_inp_set_hook
* Sets input hook.
* =============================================================================
*/
void
ud_set_input_hook(register struct ud* u, int (*hook)(struct ud*))
{
ud_inp_init(u);
u->inp_hook = hook;
}
/* =============================================================================
* ud_inp_set_buffer
* Set buffer as input.
* =============================================================================
*/
void
ud_set_input_buffer(register struct ud* u, const uint8_t* buf, size_t len)
{
ud_inp_init(u);
u->inp_buf = buf;
u->inp_buf_size = len;
u->inp_buf_index = 0;
}
#ifndef __UD_STANDALONE__
/* =============================================================================
* ud_input_set_file
* Set FILE as input.
* =============================================================================
*/
static int
inp_file_hook(struct ud* u)
{
return fgetc(u->inp_file);
}
void
ud_set_input_file(register struct ud* u, FILE* f)
{
ud_inp_init(u);
u->inp_hook = inp_file_hook;
u->inp_file = f;
}
#endif /* __UD_STANDALONE__ */
/* =============================================================================
* ud_input_skip
* Skip n input bytes.
* ============================================================================
*/
void
ud_input_skip(struct ud* u, size_t n)
{
if (u->inp_end) {
return;
}
if (u->inp_buf == NULL) {
while (n--) {
int c = u->inp_hook(u);
if (c == UD_EOI) {
goto eoi;
}
}
return;
} else {
if (n > u->inp_buf_size ||
u->inp_buf_index > u->inp_buf_size - n) {
u->inp_buf_index = u->inp_buf_size;
goto eoi;
}
u->inp_buf_index += n;
return;
}
eoi:
u->inp_end = 1;
UDERR(u, "cannot skip, eoi received\b");
return;
}
/* =============================================================================
* ud_input_end
* Returns non-zero on end-of-input.
* =============================================================================
*/
int
ud_input_end(const struct ud *u)
{
return u->inp_end;
}
/* vim:set ts=2 sw=2 expandtab */
↑ V1031 The 'memset' function is not declared. Passing data to or from this function can be affected.