ARM: Decode unconditional ARM instructions.
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3 changed files with 162 additions and 1 deletions
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@ -50,7 +50,9 @@
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//
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//
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0: decode ENCODING {
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0: decode COND_CODE {
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0xF: ArmUnconditional::armUnconditional();
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default: decode ENCODING {
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format DataOp {
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0x0: decode SEVEN_AND_FOUR {
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1: decode MISC_OPCODE {
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@ -305,4 +307,5 @@ format DataOp {
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}
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}
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}
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@ -70,3 +70,6 @@
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//Include the formats for multiply instructions
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##include "mult.isa"
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//Unconditional instructions
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##include "uncond.isa"
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155
src/arch/arm/isa/formats/uncond.isa
Normal file
155
src/arch/arm/isa/formats/uncond.isa
Normal file
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@ -0,0 +1,155 @@
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// Copyright (c) 2010 ARM Limited
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// All rights reserved
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//
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// The license below extends only to copyright in the software and shall
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// not be construed as granting a license to any other intellectual
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// property including but not limited to intellectual property relating
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// to a hardware implementation of the functionality of the software
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// licensed hereunder. You may use the software subject to the license
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// terms below provided that you ensure that this notice is replicated
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// unmodified and in its entirety in all distributions of the software,
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// modified or unmodified, in source code or in binary form.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met: redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer;
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// redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution;
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// neither the name of the copyright holders nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Authors: Gabe Black
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def format ArmUnconditional() {{
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decode_block = '''
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{
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const IntRegIndex rn = (IntRegIndex)(uint32_t)bits(machInst, 19, 16);
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const uint32_t op1 = bits(machInst, 27, 20);
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if (bits(op1, 7) == 0) {
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const uint32_t op2 = bits(machInst, 7, 4);
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if (op1 == 0x10) {
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if (bits((uint32_t)rn, 0) == 1 && op2 == 0) {
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return new WarnUnimplemented("setend", machInst);
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} else if (bits((uint32_t)rn, 0) == 0 && bits(op2, 1) == 0) {
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return new WarnUnimplemented("cps", machInst);
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}
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} else if (bits(op1, 6, 5) == 0x1) {
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return new WarnUnimplemented(
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"Advanced SIMD data-processing", machInst);
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} else if (bits(op1, 6, 4) == 0x4) {
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if (bits(op1, 0) == 0) {
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return new WarnUnimplemented(
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"Advanced SIMD element or structure load/store",
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machInst);
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} else if (bits(op1, 2, 0) == 1) {
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// Unallocated memory hint
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return new WarnUnimplemented("nop", machInst);
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} else if (bits(op1, 2, 0) == 5) {
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return new WarnUnimplemented("pli", machInst);
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}
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} else if (bits(op1, 6, 4) == 0x5) {
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if (bits(op1, 1, 0) == 0x1) {
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return new WarnUnimplemented("pld", machInst);
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} else if (op1 == 0x57) {
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switch (op2) {
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case 0x1:
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return new WarnUnimplemented("clrex", machInst);
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case 0x4:
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return new WarnUnimplemented("dsb", machInst);
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case 0x5:
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return new WarnUnimplemented("dmb", machInst);
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case 0x6:
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return new WarnUnimplemented("isb", machInst);
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}
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}
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} else if (bits(op2, 0) == 0) {
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switch (op1 & 0xf7) {
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case 0x61:
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// Unallocated memory hint
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return new WarnUnimplemented("nop", machInst);
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case 0x65:
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return new WarnUnimplemented("pli", machInst);
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case 0x71:
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return new WarnUnimplemented("pld", machInst);
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}
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}
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} else {
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switch (bits(machInst, 26, 25)) {
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case 0x0:
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{
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const uint32_t val = ((machInst >> 20) & 0x5);
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if (val == 0x4) {
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return new WarnUnimplemented("srs", machInst);
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} else if (val == 0x1) {
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return new WarnUnimplemented("rfe", machInst);
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}
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}
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break;
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case 0x1:
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{
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const uint32_t imm =
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(sext<26>(bits(machInst, 23, 0) << 2)) |
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(bits(machInst, 24) << 1);
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return new BlxImm(machInst, imm);
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}
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case 0x2:
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if (bits(op1, 0) == 1) {
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if (rn == INTREG_PC) {
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if (bits(op1, 4, 3) != 0x0) {
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return new WarnUnimplemented(
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"ldc, ldc2 (literal)", machInst);
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}
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} else {
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if (op1 == 0xC3 || op1 == 0xC7) {
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return new WarnUnimplemented(
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"ldc, ldc2 (immediate)", machInst);
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}
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}
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if (op1 == 0xC5) {
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return new WarnUnimplemented("mrrc, mrrc2", machInst);
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}
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} else {
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if (bits(op1, 4, 3) != 0 || bits(op1, 1) == 1) {
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return new WarnUnimplemented("stc, stc2", machInst);
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} else if (op1 == 0xC4) {
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return new WarnUnimplemented("mcrr, mcrrc", machInst);
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}
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}
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break;
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case 0x3:
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{
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const bool op = bits(machInst, 4);
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if (op) {
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if (bits(op1, 0)) {
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return new WarnUnimplemented(
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"mrc, mrc2", machInst);
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} else {
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return new WarnUnimplemented(
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"mcr, mcr2", machInst);
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}
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} else {
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return new WarnUnimplemented("cdp, cdp2", machInst);
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}
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}
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break;
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}
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}
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return new Unknown(machInst);
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}
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'''
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}};
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