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capstone/arch/PowerPC/PPCInstPrinter.c
Catena cyber bf97c62001 Undefined shifts (#1154) 
* Fix undefined shifts

uint8 gets promoted to signed integer

in ARM, MIPS, Sparc
in AArch64, PPC and Xcore

* fix undefined shift in powerpc

* Fix undefined shift in Mips

use mulitply instead
2018-06-02 16:49:36 +08:00

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//===-- PPCInstPrinter.cpp - Convert PPC MCInst to assembly syntax --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class prints an PPC MCInst to a .s file.
//
//===----------------------------------------------------------------------===//
/* Capstone Disassembly Engine */
/* By Nguyen Anh Quynh <aquynh@gmail.com>, 2013-2015 */
#ifdef CAPSTONE_HAS_POWERPC
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "PPCInstPrinter.h"
#include "PPCPredicates.h"
#include "../../MCInst.h"
#include "../../utils.h"
#include "../../SStream.h"
#include "../../MCRegisterInfo.h"
#include "../../MathExtras.h"
#include "PPCMapping.h"
#ifndef CAPSTONE_DIET
static char *getRegisterName(unsigned RegNo);
#endif
static void printOperand(MCInst *MI, unsigned OpNo, SStream *O);
static void printInstruction(MCInst *MI, SStream *O, MCRegisterInfo *MRI);
static void printAbsBranchOperand(MCInst *MI, unsigned OpNo, SStream *O);
static char *printAliasInstr(MCInst *MI, SStream *OS, void *info);
static char *printAliasInstrEx(MCInst *MI, SStream *OS, void *info);
static void printCustomAliasOperand(MCInst *MI, unsigned OpIdx,
unsigned PrintMethodIdx, SStream *OS);
#if 0
static void printRegName(SStream *OS, unsigned RegNo)
{
char *RegName = getRegisterName(RegNo);
if (RegName[0] == 'q' /* QPX */) {
// The system toolchain on the BG/Q does not understand QPX register names
// in .cfi_* directives, so print the name of the floating-point
// subregister instead.
RegName[0] = 'f';
}
SStream_concat0(OS, RegName);
}
#endif
static void set_mem_access(MCInst *MI, bool status)
{
if (MI->csh->detail != CS_OPT_ON)
return;
MI->csh->doing_mem = status;
if (status) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_MEM;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].mem.base = PPC_REG_INVALID;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].mem.disp = 0;
} else {
// done, create the next operand slot
MI->flat_insn->detail->ppc.op_count++;
}
}
void PPC_post_printer(csh ud, cs_insn *insn, char *insn_asm, MCInst *mci)
{
if (((cs_struct *)ud)->detail != CS_OPT_ON)
return;
// check if this insn has branch hint
if (strrchr(insn_asm, '+') != NULL && !strstr(insn_asm, ".+")) {
insn->detail->ppc.bh = PPC_BH_PLUS;
} else if (strrchr(insn_asm, '-') != NULL) {
insn->detail->ppc.bh = PPC_BH_MINUS;
}
}
#define GET_INSTRINFO_ENUM
#include "PPCGenInstrInfo.inc"
static int isBOCTRBranch(unsigned int op)
{
return ((op >= PPC_BDNZ) && (op <= PPC_BDZp));
}
void PPC_printInst(MCInst *MI, SStream *O, void *Info)
{
char *mnem;
// Check for slwi/srwi mnemonics.
if (MCInst_getOpcode(MI) == PPC_RLWINM) {
unsigned char SH = (unsigned char)MCOperand_getImm(MCInst_getOperand(MI, 2));
unsigned char MB = (unsigned char)MCOperand_getImm(MCInst_getOperand(MI, 3));
unsigned char ME = (unsigned char)MCOperand_getImm(MCInst_getOperand(MI, 4));
bool useSubstituteMnemonic = false;
if (SH <= 31 && MB == 0 && ME == (31-SH)) {
SStream_concat0(O, "slwi\t");
MCInst_setOpcodePub(MI, PPC_INS_SLWI);
useSubstituteMnemonic = true;
}
if (SH <= 31 && MB == (32-SH) && ME == 31) {
SStream_concat0(O, "srwi\t");
MCInst_setOpcodePub(MI, PPC_INS_SRWI);
useSubstituteMnemonic = true;
SH = 32-SH;
}
if (useSubstituteMnemonic) {
printOperand(MI, 0, O);
SStream_concat0(O, ", ");
printOperand(MI, 1, O);
if (SH > HEX_THRESHOLD)
SStream_concat(O, ", 0x%x", (unsigned int)SH);
else
SStream_concat(O, ", %u", (unsigned int)SH);
if (MI->csh->detail) {
cs_ppc *ppc = &MI->flat_insn->detail->ppc;
ppc->operands[ppc->op_count].type = PPC_OP_IMM;
ppc->operands[ppc->op_count].imm = SH;
++ppc->op_count;
}
return;
}
}
if ((MCInst_getOpcode(MI) == PPC_OR || MCInst_getOpcode(MI) == PPC_OR8) &&
MCOperand_getReg(MCInst_getOperand(MI, 1)) == MCOperand_getReg(MCInst_getOperand(MI, 2))) {
SStream_concat0(O, "mr\t");
MCInst_setOpcodePub(MI, PPC_INS_MR);
printOperand(MI, 0, O);
SStream_concat0(O, ", ");
printOperand(MI, 1, O);
return;
}
if (MCInst_getOpcode(MI) == PPC_RLDICR) {
unsigned char SH = (unsigned char)MCOperand_getImm(MCInst_getOperand(MI, 2));
unsigned char ME = (unsigned char)MCOperand_getImm(MCInst_getOperand(MI, 3));
// rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH
if (63-SH == ME) {
SStream_concat0(O, "sldi\t");
MCInst_setOpcodePub(MI, PPC_INS_SLDI);
printOperand(MI, 0, O);
SStream_concat0(O, ", ");
printOperand(MI, 1, O);
if (SH > HEX_THRESHOLD)
SStream_concat(O, ", 0x%x", (unsigned int)SH);
else
SStream_concat(O, ", %u", (unsigned int)SH);
return;
}
}
if ((MCInst_getOpcode(MI) == PPC_gBC)||(MCInst_getOpcode(MI) == PPC_gBCA)||
(MCInst_getOpcode(MI) == PPC_gBCL)||(MCInst_getOpcode(MI) == PPC_gBCLA)) {
int64_t bd = MCOperand_getImm(MCInst_getOperand(MI, 2));
bd = SignExtend64(bd, 14);
MCOperand_setImm(MCInst_getOperand(MI, 2),bd);
}
if (isBOCTRBranch(MCInst_getOpcode(MI))) {
if (MCOperand_isImm(MCInst_getOperand(MI,0)))
{
int64_t bd = MCOperand_getImm(MCInst_getOperand(MI, 0));
bd = SignExtend64(bd, 14);
MCOperand_setImm(MCInst_getOperand(MI, 0),bd);
}
}
if ((MCInst_getOpcode(MI) == PPC_B)||(MCInst_getOpcode(MI) == PPC_BA)||
(MCInst_getOpcode(MI) == PPC_BL)||(MCInst_getOpcode(MI) == PPC_BLA)) {
int64_t bd = MCOperand_getImm(MCInst_getOperand(MI, 0));
bd = SignExtend64(bd, 24);
MCOperand_setImm(MCInst_getOperand(MI, 0),bd);
}
// consider our own alias instructions first
mnem = printAliasInstrEx(MI, O, Info);
if (!mnem)
mnem = printAliasInstr(MI, O, Info);
if (mnem != NULL) {
if (strlen(mnem) > 0) {
struct ppc_alias alias;
// check to remove the last letter of ('.', '-', '+')
if (mnem[strlen(mnem) - 1] == '-' || mnem[strlen(mnem) - 1] == '+' || mnem[strlen(mnem) - 1] == '.')
mnem[strlen(mnem) - 1] = '\0';
if (PPC_alias_insn(mnem, &alias)) {
MCInst_setOpcodePub(MI, alias.id);
if (MI->csh->detail) {
MI->flat_insn->detail->ppc.bc = (ppc_bc)alias.cc;
}
}
}
cs_mem_free(mnem);
} else
printInstruction(MI, O, NULL);
}
enum ppc_bc_hint {
PPC_BC_LT_MINUS = (0 << 5) | 14,
PPC_BC_LE_MINUS = (1 << 5) | 6,
PPC_BC_EQ_MINUS = (2 << 5) | 14,
PPC_BC_GE_MINUS = (0 << 5) | 6,
PPC_BC_GT_MINUS = (1 << 5) | 14,
PPC_BC_NE_MINUS = (2 << 5) | 6,
PPC_BC_UN_MINUS = (3 << 5) | 14,
PPC_BC_NU_MINUS = (3 << 5) | 6,
PPC_BC_LT_PLUS = (0 << 5) | 15,
PPC_BC_LE_PLUS = (1 << 5) | 7,
PPC_BC_EQ_PLUS = (2 << 5) | 15,
PPC_BC_GE_PLUS = (0 << 5) | 7,
PPC_BC_GT_PLUS = (1 << 5) | 15,
PPC_BC_NE_PLUS = (2 << 5) | 7,
PPC_BC_UN_PLUS = (3 << 5) | 15,
PPC_BC_NU_PLUS = (3 << 5) | 7,
};
// normalize CC to remove _MINUS & _PLUS
static int cc_normalize(int cc)
{
switch(cc) {
default: return cc;
case PPC_BC_LT_MINUS: return PPC_BC_LT;
case PPC_BC_LE_MINUS: return PPC_BC_LE;
case PPC_BC_EQ_MINUS: return PPC_BC_EQ;
case PPC_BC_GE_MINUS: return PPC_BC_GE;
case PPC_BC_GT_MINUS: return PPC_BC_GT;
case PPC_BC_NE_MINUS: return PPC_BC_NE;
case PPC_BC_UN_MINUS: return PPC_BC_UN;
case PPC_BC_NU_MINUS: return PPC_BC_NU;
case PPC_BC_LT_PLUS : return PPC_BC_LT;
case PPC_BC_LE_PLUS : return PPC_BC_LE;
case PPC_BC_EQ_PLUS : return PPC_BC_EQ;
case PPC_BC_GE_PLUS : return PPC_BC_GE;
case PPC_BC_GT_PLUS : return PPC_BC_GT;
case PPC_BC_NE_PLUS : return PPC_BC_NE;
case PPC_BC_UN_PLUS : return PPC_BC_UN;
case PPC_BC_NU_PLUS : return PPC_BC_NU;
}
}
static void printPredicateOperand(MCInst *MI, unsigned OpNo,
SStream *O, const char *Modifier)
{
unsigned Code = (unsigned int)MCOperand_getImm(MCInst_getOperand(MI, OpNo));
MI->flat_insn->detail->ppc.bc = (ppc_bc)cc_normalize(Code);
if (!strcmp(Modifier, "cc")) {
switch ((ppc_predicate)Code) {
default: // unreachable
case PPC_PRED_LT_MINUS:
case PPC_PRED_LT_PLUS:
case PPC_PRED_LT:
SStream_concat0(O, "lt");
return;
case PPC_PRED_LE_MINUS:
case PPC_PRED_LE_PLUS:
case PPC_PRED_LE:
SStream_concat0(O, "le");
return;
case PPC_PRED_EQ_MINUS:
case PPC_PRED_EQ_PLUS:
case PPC_PRED_EQ:
SStream_concat0(O, "eq");
return;
case PPC_PRED_GE_MINUS:
case PPC_PRED_GE_PLUS:
case PPC_PRED_GE:
SStream_concat0(O, "ge");
return;
case PPC_PRED_GT_MINUS:
case PPC_PRED_GT_PLUS:
case PPC_PRED_GT:
SStream_concat0(O, "gt");
return;
case PPC_PRED_NE_MINUS:
case PPC_PRED_NE_PLUS:
case PPC_PRED_NE:
SStream_concat0(O, "ne");
return;
case PPC_PRED_UN_MINUS:
case PPC_PRED_UN_PLUS:
case PPC_PRED_UN:
SStream_concat0(O, "un");
return;
case PPC_PRED_NU_MINUS:
case PPC_PRED_NU_PLUS:
case PPC_PRED_NU:
SStream_concat0(O, "nu");
return;
case PPC_PRED_BIT_SET:
case PPC_PRED_BIT_UNSET:
// llvm_unreachable("Invalid use of bit predicate code");
SStream_concat0(O, "invalid-predicate");
return;
}
}
if (!strcmp(Modifier, "pm")) {
switch ((ppc_predicate)Code) {
case PPC_PRED_LT:
case PPC_PRED_LE:
case PPC_PRED_EQ:
case PPC_PRED_GE:
case PPC_PRED_GT:
case PPC_PRED_NE:
case PPC_PRED_UN:
case PPC_PRED_NU:
return;
case PPC_PRED_LT_MINUS:
case PPC_PRED_LE_MINUS:
case PPC_PRED_EQ_MINUS:
case PPC_PRED_GE_MINUS:
case PPC_PRED_GT_MINUS:
case PPC_PRED_NE_MINUS:
case PPC_PRED_UN_MINUS:
case PPC_PRED_NU_MINUS:
SStream_concat0(O, "-");
return;
case PPC_PRED_LT_PLUS:
case PPC_PRED_LE_PLUS:
case PPC_PRED_EQ_PLUS:
case PPC_PRED_GE_PLUS:
case PPC_PRED_GT_PLUS:
case PPC_PRED_NE_PLUS:
case PPC_PRED_UN_PLUS:
case PPC_PRED_NU_PLUS:
SStream_concat0(O, "+");
return;
case PPC_PRED_BIT_SET:
case PPC_PRED_BIT_UNSET:
// llvm_unreachable("Invalid use of bit predicate code");
SStream_concat0(O, "invalid-predicate");
return;
default: // unreachable
return;
}
// llvm_unreachable("Invalid predicate code");
}
//assert(StringRef(Modifier) == "reg" &&
// "Need to specify 'cc', 'pm' or 'reg' as predicate op modifier!");
printOperand(MI, OpNo + 1, O);
}
static void printU2ImmOperand(MCInst *MI, unsigned OpNo, SStream *O)
{
unsigned int Value = (int)MCOperand_getImm(MCInst_getOperand(MI, OpNo));
//assert(Value <= 3 && "Invalid u2imm argument!");
if (Value > HEX_THRESHOLD)
SStream_concat(O, "0x%x", Value);
else
SStream_concat(O, "%u", Value);
if (MI->csh->detail) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_IMM;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].imm = Value;
MI->flat_insn->detail->ppc.op_count++;
}
}
static void printU4ImmOperand(MCInst *MI, unsigned OpNo, SStream *O)
{
unsigned int Value = (int)MCOperand_getImm(MCInst_getOperand(MI, OpNo));
//assert(Value <= 15 && "Invalid u4imm argument!");
if (Value > HEX_THRESHOLD)
SStream_concat(O, "0x%x", Value);
else
SStream_concat(O, "%u", Value);
if (MI->csh->detail) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_IMM;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].imm = Value;
MI->flat_insn->detail->ppc.op_count++;
}
}
static void printS5ImmOperand(MCInst *MI, unsigned OpNo, SStream *O)
{
int Value = (int)MCOperand_getImm(MCInst_getOperand(MI, OpNo));
Value = SignExtend32(Value, 5);
if (Value >= 0) {
if (Value > HEX_THRESHOLD)
SStream_concat(O, "0x%x", Value);
else
SStream_concat(O, "%u", Value);
} else {
if (Value < -HEX_THRESHOLD)
SStream_concat(O, "-0x%x", -Value);
else
SStream_concat(O, "-%u", -Value);
}
if (MI->csh->detail) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_IMM;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].imm = Value;
MI->flat_insn->detail->ppc.op_count++;
}
}
static void printU5ImmOperand(MCInst *MI, unsigned OpNo, SStream *O)
{
unsigned int Value = (unsigned int)MCOperand_getImm(MCInst_getOperand(MI, OpNo));
//assert(Value <= 31 && "Invalid u5imm argument!");
if (Value > HEX_THRESHOLD)
SStream_concat(O, "0x%x", Value);
else
SStream_concat(O, "%u", Value);
if (MI->csh->detail) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_IMM;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].imm = Value;
MI->flat_insn->detail->ppc.op_count++;
}
}
static void printU6ImmOperand(MCInst *MI, unsigned OpNo, SStream *O)
{
unsigned int Value = (unsigned int)MCOperand_getImm(MCInst_getOperand(MI, OpNo));
//assert(Value <= 63 && "Invalid u6imm argument!");
if (Value > HEX_THRESHOLD)
SStream_concat(O, "0x%x", Value);
else
SStream_concat(O, "%u", Value);
if (MI->csh->detail) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_IMM;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].imm = Value;
MI->flat_insn->detail->ppc.op_count++;
}
}
static void printU12ImmOperand(MCInst *MI, unsigned OpNo, SStream *O)
{
unsigned short Value = (unsigned short)MCOperand_getImm(MCInst_getOperand(MI, OpNo));
// assert(Value <= 4095 && "Invalid u12imm argument!");
if (Value > HEX_THRESHOLD)
SStream_concat(O, "0x%x", Value);
else
SStream_concat(O, "%u", Value);
if (MI->csh->detail) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_IMM;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].imm = Value;
MI->flat_insn->detail->ppc.op_count++;
}
}
static void printS16ImmOperand(MCInst *MI, unsigned OpNo, SStream *O)
{
if (MCOperand_isImm(MCInst_getOperand(MI, OpNo))) {
short Imm = (short)MCOperand_getImm(MCInst_getOperand(MI, OpNo));
if (Imm >= 0) {
if (Imm > HEX_THRESHOLD)
SStream_concat(O, "0x%x", Imm);
else
SStream_concat(O, "%u", Imm);
} else {
if (Imm < -HEX_THRESHOLD)
SStream_concat(O, "-0x%x", -Imm);
else
SStream_concat(O, "-%u", -Imm);
}
if (MI->csh->detail) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_IMM;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].imm = Imm;
MI->flat_insn->detail->ppc.op_count++;
}
} else
printOperand(MI, OpNo, O);
}
static void printS16ImmOperand_Mem(MCInst *MI, unsigned OpNo, SStream *O)
{
if (MCOperand_isImm(MCInst_getOperand(MI, OpNo))) {
short Imm = (short)MCOperand_getImm(MCInst_getOperand(MI, OpNo));
if (Imm >= 0) {
if (Imm > HEX_THRESHOLD)
SStream_concat(O, "0x%x", Imm);
else
SStream_concat(O, "%u", Imm);
} else {
if (Imm < -HEX_THRESHOLD)
SStream_concat(O, "-0x%x", -Imm);
else
SStream_concat(O, "-%u", -Imm);
}
if (MI->csh->detail) {
if (MI->csh->doing_mem) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].mem.disp = Imm;
} else {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_IMM;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].imm = Imm;
MI->flat_insn->detail->ppc.op_count++;
}
}
} else
printOperand(MI, OpNo, O);
}
static void printU16ImmOperand(MCInst *MI, unsigned OpNo, SStream *O)
{
if (MCOperand_isImm(MCInst_getOperand(MI, OpNo))) {
unsigned short Imm = (unsigned short)MCOperand_getImm(MCInst_getOperand(MI, OpNo));
if (Imm > HEX_THRESHOLD)
SStream_concat(O, "0x%x", Imm);
else
SStream_concat(O, "%u", Imm);
if (MI->csh->detail) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_IMM;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].imm = Imm;
MI->flat_insn->detail->ppc.op_count++;
}
} else
printOperand(MI, OpNo, O);
}
static void printBranchOperand(MCInst *MI, unsigned OpNo, SStream *O)
{
if (!MCOperand_isImm(MCInst_getOperand(MI, OpNo))) {
printOperand(MI, OpNo, O);
return;
}
// Branches can take an immediate operand. This is used by the branch
// selection pass to print .+8, an eight byte displacement from the PC.
printAbsBranchOperand(MI, OpNo, O);
}
static void printAbsBranchOperand(MCInst *MI, unsigned OpNo, SStream *O)
{
int64_t imm;
if (!MCOperand_isImm(MCInst_getOperand(MI, OpNo))) {
printOperand(MI, OpNo, O);
return;
}
imm = MCOperand_getImm(MCInst_getOperand(MI, OpNo)) * 4;
if (!PPC_abs_branch(MI->csh, MCInst_getOpcode(MI))) {
imm = MI->address + imm;
}
SStream_concat(O, "0x%"PRIx64, imm);
if (MI->csh->detail) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_IMM;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].imm = imm;
MI->flat_insn->detail->ppc.op_count++;
}
}
#define GET_REGINFO_ENUM
#include "PPCGenRegisterInfo.inc"
static void printcrbitm(MCInst *MI, unsigned OpNo, SStream *O)
{
unsigned RegNo, tmp;
unsigned CCReg = MCOperand_getReg(MCInst_getOperand(MI, OpNo));
switch (CCReg) {
default: // llvm_unreachable("Unknown CR register");
case PPC_CR0: RegNo = 0; break;
case PPC_CR1: RegNo = 1; break;
case PPC_CR2: RegNo = 2; break;
case PPC_CR3: RegNo = 3; break;
case PPC_CR4: RegNo = 4; break;
case PPC_CR5: RegNo = 5; break;
case PPC_CR6: RegNo = 6; break;
case PPC_CR7: RegNo = 7; break;
}
tmp = 0x80 >> RegNo;
if (tmp > HEX_THRESHOLD)
SStream_concat(O, "0x%x", tmp);
else
SStream_concat(O, "%u", tmp);
}
static void printMemRegImm(MCInst *MI, unsigned OpNo, SStream *O)
{
set_mem_access(MI, true);
printS16ImmOperand_Mem(MI, OpNo, O);
SStream_concat0(O, "(");
if (MCOperand_getReg(MCInst_getOperand(MI, OpNo + 1)) == PPC_R0)
SStream_concat0(O, "0");
else
printOperand(MI, OpNo + 1, O);
SStream_concat0(O, ")");
set_mem_access(MI, false);
}
static void printMemRegReg(MCInst *MI, unsigned OpNo, SStream *O)
{
// When used as the base register, r0 reads constant zero rather than
// the value contained in the register. For this reason, the darwin
// assembler requires that we print r0 as 0 (no r) when used as the base.
if (MCOperand_getReg(MCInst_getOperand(MI, OpNo)) == PPC_R0)
SStream_concat0(O, "0");
else
printOperand(MI, OpNo, O);
SStream_concat0(O, ", ");
printOperand(MI, OpNo + 1, O);
}
static void printTLSCall(MCInst *MI, unsigned OpNo, SStream *O)
{
set_mem_access(MI, true);
//printBranchOperand(MI, OpNo, O);
// On PPC64, VariantKind is VK_None, but on PPC32, it's VK_PLT, and it must
// come at the _end_ of the expression.
SStream_concat0(O, "(");
printOperand(MI, OpNo + 1, O);
SStream_concat0(O, ")");
set_mem_access(MI, false);
}
#ifndef CAPSTONE_DIET
/// stripRegisterPrefix - This method strips the character prefix from a
/// register name so that only the number is left. Used by for linux asm.
static char *stripRegisterPrefix(char *RegName)
{
switch (RegName[0]) {
case 'r':
case 'f':
case 'q': // for QPX
case 'v':
if (RegName[1] == 's')
return RegName + 2;
return RegName + 1;
case 'c':
if (RegName[1] == 'r')
return RegName + 2;
}
return RegName;
}
#endif
static void printOperand(MCInst *MI, unsigned OpNo, SStream *O)
{
MCOperand *Op = MCInst_getOperand(MI, OpNo);
if (MCOperand_isReg(Op)) {
unsigned reg = MCOperand_getReg(Op);
#ifndef CAPSTONE_DIET
char *RegName = getRegisterName(reg);
#endif
// map to public register
reg = PPC_map_register(reg);
#ifndef CAPSTONE_DIET
// The linux and AIX assembler does not take register prefixes.
if (MI->csh->syntax == CS_OPT_SYNTAX_NOREGNAME)
RegName = stripRegisterPrefix(RegName);
SStream_concat0(O, RegName);
#endif
if (MI->csh->detail) {
if (MI->csh->doing_mem) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].mem.base = reg;
} else {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_REG;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].reg = reg;
MI->flat_insn->detail->ppc.op_count++;
}
}
return;
}
if (MCOperand_isImm(Op)) {
int64_t imm = MCOperand_getImm(Op);
if (imm >= 0) {
if (imm > HEX_THRESHOLD)
SStream_concat(O, "0x%" PRIx64, imm);
else
SStream_concat(O, "%" PRIu64 , imm);
} else {
if (imm < -HEX_THRESHOLD)
SStream_concat(O, "-0x%" PRIx64 , -imm);
else
SStream_concat(O, "-%" PRIu64 , -imm);
}
if (MI->csh->detail) {
if (MI->csh->doing_mem) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].mem.disp = (int32_t)imm;
} else {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_IMM;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].imm = imm;
MI->flat_insn->detail->ppc.op_count++;
}
}
}
}
static void op_addImm(MCInst *MI, int v)
{
if (MI->csh->detail) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_IMM;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].imm = v;
MI->flat_insn->detail->ppc.op_count++;
}
}
static void op_addReg(MCInst *MI, unsigned int reg)
{
if (MI->csh->detail) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_REG;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].reg = reg;
MI->flat_insn->detail->ppc.op_count++;
}
}
static void op_addBC(MCInst *MI, unsigned int bc)
{
if (MI->csh->detail) {
MI->flat_insn->detail->ppc.bc = (ppc_bc)bc;
}
}
#define CREQ (0)
#define CRGT (1)
#define CRLT (2)
#define CRUN (3)
static int getBICRCond(int bi)
{
return (bi-PPC_CR0EQ) >> 3;
}
static int getBICR(int bi)
{
return ((bi - PPC_CR0EQ) & 7) + PPC_CR0;
}
static char *printAliasInstrEx(MCInst *MI, SStream *OS, void *info)
{
#define GETREGCLASS_CONTAIN(_class, _reg) MCRegisterClass_contains(MCRegisterInfo_getRegClass(MRI, _class), MCOperand_getReg(MCInst_getOperand(MI, _reg)))
SStream ss;
const char *opCode;
char *tmp, *AsmMnem, *AsmOps, *c;
int OpIdx, PrintMethodIdx;
int decCtr = false, needComma = false;
MCRegisterInfo *MRI = (MCRegisterInfo *)info;
SStream_Init(&ss);
switch (MCInst_getOpcode(MI)) {
default: return NULL;
case PPC_gBC:
opCode = "b%s";
break;
case PPC_gBCA:
opCode = "b%sa";
break;
case PPC_gBCCTR:
opCode = "b%sctr";
break;
case PPC_gBCCTRL:
opCode = "b%sctrl";
break;
case PPC_gBCL:
opCode = "b%sl";
break;
case PPC_gBCLA:
opCode = "b%sla";
break;
case PPC_gBCLR:
opCode = "b%slr";
break;
case PPC_gBCLRL:
opCode = "b%slrl";
break;
}
if (MCInst_getNumOperands(MI) == 3 &&
MCOperand_isImm(MCInst_getOperand(MI, 0)) &&
(MCOperand_getImm(MCInst_getOperand(MI, 0)) >= 0) &&
(MCOperand_getImm(MCInst_getOperand(MI, 0)) <= 1)) {
SStream_concat(&ss, opCode, "dnzf");
decCtr = true;
}
if (MCInst_getNumOperands(MI) == 3 &&
MCOperand_isImm(MCInst_getOperand(MI, 0)) &&
(MCOperand_getImm(MCInst_getOperand(MI, 0)) >= 2) &&
(MCOperand_getImm(MCInst_getOperand(MI, 0)) <= 3)) {
SStream_concat(&ss, opCode, "dzf");
decCtr = true;
}
if (MCInst_getNumOperands(MI) == 3 &&
MCOperand_isImm(MCInst_getOperand(MI, 0)) &&
(MCOperand_getImm(MCInst_getOperand(MI, 0)) >= 4) &&
(MCOperand_getImm(MCInst_getOperand(MI, 0)) <= 7) &&
MCOperand_isReg(MCInst_getOperand(MI, 1)) &&
GETREGCLASS_CONTAIN(PPC_CRBITRCRegClassID, 1)) {
int cr = getBICRCond(MCOperand_getReg(MCInst_getOperand(MI, 1)));
switch(cr) {
case CREQ:
SStream_concat(&ss, opCode, "ne");
break;
case CRGT:
SStream_concat(&ss, opCode, "le");
break;
case CRLT:
SStream_concat(&ss, opCode, "ge");
break;
case CRUN:
SStream_concat(&ss, opCode, "ns");
break;
}
if (MCOperand_getImm(MCInst_getOperand(MI, 0)) == 6)
SStream_concat0(&ss, "-");
if (MCOperand_getImm(MCInst_getOperand(MI, 0)) == 7)
SStream_concat0(&ss, "+");
decCtr = false;
}
if (MCInst_getNumOperands(MI) == 3 &&
MCOperand_isImm(MCInst_getOperand(MI, 0)) &&
(MCOperand_getImm(MCInst_getOperand(MI, 0)) >= 8) &&
(MCOperand_getImm(MCInst_getOperand(MI, 0)) <= 9)) {
SStream_concat(&ss, opCode, "dnzt");
decCtr = true;
}
if (MCInst_getNumOperands(MI) == 3 &&
MCOperand_isImm(MCInst_getOperand(MI, 0)) &&
(MCOperand_getImm(MCInst_getOperand(MI, 0)) >= 10) &&
(MCOperand_getImm(MCInst_getOperand(MI, 0)) <= 11)) {
SStream_concat(&ss, opCode, "dzt");
decCtr = true;
}
if (MCInst_getNumOperands(MI) == 3 &&
MCOperand_isImm(MCInst_getOperand(MI, 0)) &&
(MCOperand_getImm(MCInst_getOperand(MI, 0)) >= 12) &&
(MCOperand_getImm(MCInst_getOperand(MI, 0)) <= 15) &&
MCOperand_isReg(MCInst_getOperand(MI, 1)) &&
GETREGCLASS_CONTAIN(PPC_CRBITRCRegClassID, 1)) {
int cr = getBICRCond(MCOperand_getReg(MCInst_getOperand(MI, 1)));
switch(cr) {
case CREQ:
SStream_concat(&ss, opCode, "eq");
break;
case CRGT:
SStream_concat(&ss, opCode, "gt");
break;
case CRLT:
SStream_concat(&ss, opCode, "lt");
break;
case CRUN:
SStream_concat(&ss, opCode, "so");
break;
}
if (MCOperand_getImm(MCInst_getOperand(MI, 0)) == 14)
SStream_concat0(&ss, "-");
if (MCOperand_getImm(MCInst_getOperand(MI, 0)) == 15)
SStream_concat0(&ss, "+");
decCtr = false;
}
if (MCInst_getNumOperands(MI) == 3 &&
MCOperand_isImm(MCInst_getOperand(MI, 0)) &&
((MCOperand_getImm(MCInst_getOperand(MI, 0)) & 0x12)== 16)) {
SStream_concat(&ss, opCode, "dnz");
if (MCOperand_getImm(MCInst_getOperand(MI, 0)) == 24)
SStream_concat0(&ss, "-");
if (MCOperand_getImm(MCInst_getOperand(MI, 0)) == 25)
SStream_concat0(&ss, "+");
needComma = false;
}
if (MCInst_getNumOperands(MI) == 3 &&
MCOperand_isImm(MCInst_getOperand(MI, 0)) &&
((MCOperand_getImm(MCInst_getOperand(MI, 0)) & 0x12)== 18)) {
SStream_concat(&ss, opCode, "dz");
if (MCOperand_getImm(MCInst_getOperand(MI, 0)) == 26)
SStream_concat0(&ss, "-");
if (MCOperand_getImm(MCInst_getOperand(MI, 0)) == 27)
SStream_concat0(&ss, "+");
needComma = false;
}
if (MCOperand_isReg(MCInst_getOperand(MI, 1)) &&
GETREGCLASS_CONTAIN(PPC_CRBITRCRegClassID, 1) &&
MCOperand_isImm(MCInst_getOperand(MI, 0)) &&
(MCOperand_getImm(MCInst_getOperand(MI, 0)) < 16)) {
int cr = getBICR(MCOperand_getReg(MCInst_getOperand(MI, 1)));
if (decCtr) {
needComma = true;
SStream_concat0(&ss, " ");
if (cr > PPC_CR0) {
SStream_concat(&ss, "4*cr%d+", cr - PPC_CR0);
}
cr = getBICRCond(MCOperand_getReg(MCInst_getOperand(MI, 1)));
switch(cr) {
case CREQ:
SStream_concat0(&ss, "eq");
op_addBC(MI, PPC_BC_EQ);
break;
case CRGT:
SStream_concat0(&ss, "gt");
op_addBC(MI, PPC_BC_GT);
break;
case CRLT:
SStream_concat0(&ss, "lt");
op_addBC(MI, PPC_BC_LT);
break;
case CRUN:
SStream_concat0(&ss, "so");
op_addBC(MI, PPC_BC_SO);
break;
}
cr = getBICR(MCOperand_getReg(MCInst_getOperand(MI, 1)));
if (cr > PPC_CR0) {
if (MI->csh->detail) {
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].type = PPC_OP_CRX;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].crx.scale = 4;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].crx.reg = PPC_REG_CR0 + cr - PPC_CR0;
MI->flat_insn->detail->ppc.operands[MI->flat_insn->detail->ppc.op_count].crx.cond = MI->flat_insn->detail->ppc.bc;
MI->flat_insn->detail->ppc.op_count++;
}
}
} else {
if (cr > PPC_CR0) {
needComma = true;
SStream_concat(&ss, " cr%d", cr - PPC_CR0);
op_addReg(MI, PPC_REG_CR0 + cr - PPC_CR0);
}
}
}
if (MCOperand_isImm(MCInst_getOperand(MI, 2)) &&
MCOperand_getImm(MCInst_getOperand(MI, 2)) != 0) {
if (needComma)
SStream_concat0(&ss, ",");
SStream_concat0(&ss, " $\xFF\x03\x01");
}
tmp = cs_strdup(ss.buffer);
AsmMnem = tmp;
for(AsmOps = tmp; *AsmOps; AsmOps++) {
if (*AsmOps == ' ' || *AsmOps == '\t') {
*AsmOps = '\0';
AsmOps++;
break;
}
}
SStream_concat0(OS, AsmMnem);
if (*AsmOps) {
SStream_concat0(OS, "\t");
for (c = AsmOps; *c; c++) {
if (*c == '$') {
c += 1;
if (*c == (char)0xff) {
c += 1;
OpIdx = *c - 1;
c += 1;
PrintMethodIdx = *c - 1;
printCustomAliasOperand(MI, OpIdx, PrintMethodIdx, OS);
} else
printOperand(MI, *c - 1, OS);
} else {
SStream_concat(OS, "%c", *c);
}
}
}
return tmp;
}
#define PRINT_ALIAS_INSTR
#include "PPCGenAsmWriter.inc"
#endif
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