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/* udis86 - libudis86/syn-att.c
*
* Copyright (c) 2002-2009 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 "config.h"
#if USE(UDIS86)
#include "udis86_types.h"
#include "udis86_extern.h"
#include "udis86_decode.h"
#include "udis86_itab.h"
#include "udis86_syn.h"
/* -----------------------------------------------------------------------------
* opr_cast() - Prints an operand cast.
* -----------------------------------------------------------------------------
*/
static void
opr_cast(struct ud* u, struct ud_operand* op)
{
switch(op->size) {
case 16 : case 32 :
mkasm(u, "*"); break;
default: break;
}
}
/* -----------------------------------------------------------------------------
* gen_operand() - Generates assembly output for each operand.
* -----------------------------------------------------------------------------
*/
static void
gen_operand(struct ud* u, struct ud_operand* op)
{
switch(op->type) {
case UD_OP_REG:
mkasm(u, "%%%s", ud_reg_tab[op->base - UD_R_AL]);
break;
case UD_OP_MEM:
if (u->br_far) opr_cast(u, op);
if (u->pfx_seg)
mkasm(u, "%%%s:", ud_reg_tab[u->pfx_seg - UD_R_AL]);
if (op->offset == 8) {
if (op->lval.sbyte < 0)
mkasm(u, "-0x%x", (-op->lval.sbyte) & 0xff);
else mkasm(u, "0x%x", op->lval.sbyte);
}
else if (op->offset == 16)
mkasm(u, "0x%x", op->lval.uword);
else if (op->offset == 32)
mkasm(u, "0x%lx", (unsigned long)op->lval.udword);
else if (op->offset == 64)
mkasm(u, "0x" FMT64 "x", op->lval.uqword);
if (op->base)
mkasm(u, "(%%%s", ud_reg_tab[op->base - UD_R_AL]);
if (op->index) {
if (op->base)
mkasm(u, ",");
else mkasm(u, "(");
mkasm(u, "%%%s", ud_reg_tab[op->index - UD_R_AL]);
}
if (op->scale)
mkasm(u, ",%d", op->scale);
if (op->base || op->index)
mkasm(u, ")");
break;
case UD_OP_IMM: {
int64_t imm = 0;
uint64_t sext_mask = 0xffffffffffffffffull;
unsigned sext_size = op->size;
switch (op->size) {
case 8: imm = op->lval.sbyte; break;
case 16: imm = op->lval.sword; break;
case 32: imm = op->lval.sdword; break;
case 64: imm = op->lval.sqword; break;
}
if ( P_SEXT( u->itab_entry->prefix ) ) {
sext_size = u->operand[ 0 ].size;
if ( u->mnemonic == UD_Ipush )
/* push sign-extends to operand size */
sext_size = u->opr_mode;
}
if ( sext_size < 64 )
sext_mask = ( 1ull << sext_size ) - 1;
mkasm( u, "$0x" FMT64 "x", imm & sext_mask );
break;
}
case UD_OP_JIMM:
switch (op->size) {
case 8:
mkasm(u, "0x" FMT64 "x", u->pc + op->lval.sbyte);
break;
case 16:
mkasm(u, "0x" FMT64 "x", (u->pc + op->lval.sword) & 0xffff );
break;
case 32:
if (u->dis_mode == 32)
mkasm(u, "0x" FMT64 "x", (u->pc + op->lval.sdword) & 0xffffffff);
else
mkasm(u, "0x" FMT64 "x", u->pc + op->lval.sdword);
break;
default:break;
}
break;
case UD_OP_PTR:
switch (op->size) {
case 32:
mkasm(u, "$0x%x, $0x%x", op->lval.ptr.seg,
op->lval.ptr.off & 0xFFFF);
break;
case 48:
mkasm(u, "$0x%x, $0x%lx", op->lval.ptr.seg,
(unsigned long)op->lval.ptr.off);
break;
}
break;
default: return;
}
}
/* =============================================================================
* translates to AT&T syntax
* =============================================================================
*/
extern void
ud_translate_att(struct ud *u)
{
int size = 0;
/* check if P_OSO prefix is used */
if (! P_OSO(u->itab_entry->prefix) && u->pfx_opr) {
switch (u->dis_mode) {
case 16:
mkasm(u, "o32 ");
break;
case 32:
case 64:
mkasm(u, "o16 ");
break;
}
}
/* check if P_ASO prefix was used */
if (! P_ASO(u->itab_entry->prefix) && u->pfx_adr) {
switch (u->dis_mode) {
case 16:
mkasm(u, "a32 ");
break;
case 32:
mkasm(u, "a16 ");
break;
case 64:
mkasm(u, "a32 ");
break;
}
}
if (u->pfx_lock)
mkasm(u, "lock ");
if (u->pfx_rep)
mkasm(u, "rep ");
if (u->pfx_repne)
mkasm(u, "repne ");
/* special instructions */
switch (u->mnemonic) {
case UD_Iretf:
mkasm(u, "lret ");
break;
case UD_Idb:
mkasm(u, ".byte 0x%x", u->operand[0].lval.ubyte);
return;
case UD_Ijmp:
case UD_Icall:
if (u->br_far) mkasm(u, "l");
mkasm(u, "%s", ud_lookup_mnemonic(u->mnemonic));
break;
case UD_Ibound:
case UD_Ienter:
if (u->operand[0].type != UD_NONE)
gen_operand(u, &u->operand[0]);
if (u->operand[1].type != UD_NONE) {
mkasm(u, ",");
gen_operand(u, &u->operand[1]);
}
return;
default:
mkasm(u, "%s", ud_lookup_mnemonic(u->mnemonic));
}
if (u->c1)
size = u->operand[0].size;
else if (u->c2)
size = u->operand[1].size;
else if (u->c3)
size = u->operand[2].size;
if (size == 8)
mkasm(u, "b");
else if (size == 16)
mkasm(u, "w");
else if (size == 64)
mkasm(u, "q");
mkasm(u, " ");
if (u->operand[2].type != UD_NONE) {
gen_operand(u, &u->operand[2]);
mkasm(u, ", ");
}
if (u->operand[1].type != UD_NONE) {
gen_operand(u, &u->operand[1]);
mkasm(u, ", ");
}
if (u->operand[0].type != UD_NONE)
gen_operand(u, &u->operand[0]);
}
#endif // USE(UDIS86)
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