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// -*- mode:c++ -*-
// Copyright (c) 2010 ARM Limited
// All rights reserved
//
// The license below extends only to copyright in the software and shall
// not be construed as granting a license to any other intellectual
// property including but not limited to intellectual property relating
// to a hardware implementation of the functionality of the software
// licensed hereunder. You may use the software subject to the license
// terms below provided that you ensure that this notice is replicated
// unmodified and in its entirety in all distributions of the software,
// modified or unmodified, in source code or in binary form.
//
// Copyright (c) 2007-2008 The Florida State University
// 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;
// neither the name of the copyright holders nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// 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.
//
// Authors: Stephen Hines
////////////////////////////////////////////////////////////////////
//
// Control transfer instructions
//
def format ArmBBlxImm() {{
decode_block = '''
if (machInst.condCode == 0xF) {
int32_t imm = (sext<26>(bits(machInst, 23, 0) << 2)) |
(bits(machInst, 24) << 1);
return new BlxImm(machInst, imm, COND_UC);
} else {
return new B(machInst, sext<26>(bits(machInst, 23, 0) << 2),
(ConditionCode)(uint32_t)machInst.condCode);
}
'''
}};
def format ArmBlBlxImm() {{
decode_block = '''
if (machInst.condCode == 0xF) {
int32_t imm = (sext<26>(bits(machInst, 23, 0) << 2)) |
(bits(machInst, 24) << 1);
return new BlxImm(machInst, imm, COND_UC);
} else {
return new Bl(machInst, sext<26>(bits(machInst, 23, 0) << 2),
(ConditionCode)(uint32_t)machInst.condCode);
}
'''
}};
def format ArmBxClz() {{
decode_block = '''
{
const IntRegIndex rm = (IntRegIndex)(uint32_t)bits(machInst, 3, 0);
const IntRegIndex rd = (IntRegIndex)(uint32_t)bits(machInst, 15, 12);
if (OPCODE == 0x9) {
return new BxReg(machInst, rm,
(ConditionCode)(uint32_t)machInst.condCode);
} else if (OPCODE == 0xb) {
return new Clz(machInst, rd, rm);
} else {
return new Unknown(machInst);
}
}
'''
}};
def format ArmBlxReg() {{
decode_block = '''
return new BlxReg(machInst, (IntRegIndex)(uint32_t)bits(machInst, 3, 0),
(ConditionCode)(uint32_t)machInst.condCode);
'''
}};
def format Thumb16CondBranchAndSvc() {{
decode_block = '''
if (bits(machInst, 11, 9) != 0x7) {
return new B(machInst, sext<9>(bits(machInst, 7, 0) << 1),
(ConditionCode)(uint32_t)bits(machInst, 11, 8));
} else if (bits(machInst, 8)) {
return new Svc(machInst);
} else {
// This space will not be allocated in the future.
return new Unknown(machInst);
}
'''
}};
def format Thumb16UncondBranch() {{
decode_block = '''
return new B(machInst, sext<12>(bits(machInst, 10, 0) << 1), COND_UC);
'''
}};
def format Thumb32BranchesAndMiscCtrl() {{
decode_block = '''
{
const uint32_t op = bits(machInst, 26, 20);
const uint32_t op1 = bits(machInst, 14, 12);
switch (op1 & 0x5) {
case 0x0:
if (op == 127) {
if (op1 & 0x2) {
// Permanently undefined.
return new Unknown(machInst);
} else {
return new WarnUnimplemented("smc", machInst);
}
} else if ((op & 0x38) != 0x38) {
const uint32_t s = bits(machInst, 26);
const uint32_t j1 = bits(machInst, 13);
const uint32_t j2 = bits(machInst, 11);
const uint32_t imm6 = bits(machInst, 21, 16);
const uint32_t imm11 = bits(machInst, 10, 0);
const int32_t imm = sext<21>((s << 20) |
(j2 << 19) | (j1 << 18) |
(imm6 << 12) | (imm11 << 1));
return new B(machInst, imm,
(ConditionCode)(uint32_t)bits(machInst, 25, 22));
} else {
switch (op) {
case 0x38:
{
const IntRegIndex rn =
(IntRegIndex)(uint32_t)bits(machInst, 19, 16);
const uint8_t byteMask = bits(machInst, 11, 8);
return new MsrCpsrReg(machInst, rn, byteMask);
}
case 0x39:
{
const IntRegIndex rn =
(IntRegIndex)(uint32_t)bits(machInst, 19, 16);
const uint8_t byteMask = bits(machInst, 11, 8);
return new MsrSpsrReg(machInst, rn, byteMask);
}
case 0x3a:
{
const uint32_t op1 = bits(machInst, 10, 8);
const uint32_t op2 = bits(machInst, 7, 0);
if (op1 != 0) {
const bool enable = bits(machInst, 10, 9) == 0x2;
const uint32_t mods = bits(machInst, 8, 0) |
((enable ? 1 : 0) << 9);
return new Cps(machInst, mods);
} else if ((op2 & 0xf0) == 0xf0) {
return new Dbg(machInst);
} else {
switch (op2) {
case 0x0:
return new NopInst(machInst);
case 0x1:
return new YieldInst(machInst);
case 0x2:
return new WfeInst(machInst);
case 0x3:
return new WfiInst(machInst);
case 0x4:
return new SevInst(machInst);
default:
break;
}
}
break;
}
case 0x3b:
{
const uint32_t op = bits(machInst, 7, 4);
switch (op) {
case 0x0:
return new Leavex(machInst);
case 0x1:
return new Enterx(machInst);
case 0x2:
return new Clrex(machInst);
case 0x4:
return new Dsb(machInst);
case 0x5:
return new Dmb(machInst);
case 0x6:
return new Isb(machInst);
default:
break;
}
break;
}
case 0x3c:
{
// On systems that don't support bxj, bxj == bx
return new BxReg(machInst,
(IntRegIndex)(uint32_t)bits(machInst, 19, 16),
COND_UC);
}
case 0x3d:
{
const uint32_t imm32 = bits(machInst, 7, 0);
return new SubsImmPclr(machInst, INTREG_PC, INTREG_LR,
imm32, false);
}
case 0x3e:
{
const IntRegIndex rd =
(IntRegIndex)(uint32_t)bits(machInst, 11, 8);
return new MrsCpsr(machInst, rd);
}
case 0x3f:
{
const IntRegIndex rd =
(IntRegIndex)(uint32_t)bits(machInst, 11, 8);
return new MrsSpsr(machInst, rd);
}
}
break;
}
case 0x1:
{
ConditionCode condCode;
if(machInst.itstateMask) {
condCode = (ConditionCode)(uint8_t)machInst.itstateCond;
} else {
condCode = COND_UC;
}
const uint32_t s = bits(machInst, 26);
const uint32_t i1 = !(bits(machInst, 13) ^ s);
const uint32_t i2 = !(bits(machInst, 11) ^ s);
const uint32_t imm10 = bits(machInst, 25, 16);
const uint32_t imm11 = bits(machInst, 10, 0);
const int32_t imm = sext<25>((s << 24) |
(i1 << 23) | (i2 << 22) |
(imm10 << 12) | (imm11 << 1));
return new B(machInst, imm, condCode);
}
case 0x4:
{
if (bits(machInst, 0) == 1) {
return new Unknown(machInst);
}
ConditionCode condCode;
if(machInst.itstateMask) {
condCode = (ConditionCode)(uint8_t)machInst.itstateCond;
} else {
condCode = COND_UC;
}
const uint32_t s = bits(machInst, 26);
const uint32_t i1 = !(bits(machInst, 13) ^ s);
const uint32_t i2 = !(bits(machInst, 11) ^ s);
const uint32_t imm10h = bits(machInst, 25, 16);
const uint32_t imm10l = bits(machInst, 10, 1);
const int32_t imm = sext<25>((s << 24) |
(i1 << 23) | (i2 << 22) |
(imm10h << 12) | (imm10l << 2));
return new BlxImm(machInst, imm, condCode);
}
case 0x5:
{
ConditionCode condCode;
if(machInst.itstateMask) {
condCode = (ConditionCode)(uint8_t)machInst.itstateCond;
} else {
condCode = COND_UC;
}
const uint32_t s = bits(machInst, 26);
const uint32_t i1 = !(bits(machInst, 13) ^ s);
const uint32_t i2 = !(bits(machInst, 11) ^ s);
const uint32_t imm10 = bits(machInst, 25, 16);
const uint32_t imm11 = bits(machInst, 10, 0);
const int32_t imm = sext<25>((s << 24) |
(i1 << 23) | (i2 << 22) |
(imm10 << 12) | (imm11 << 1));
return new Bl(machInst, imm, condCode);
}
default:
break;
}
return new Unknown(machInst);
}
'''
}};
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