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fail/debuggers/openocd/opcode_parser/arm-opcode-ldrstr.c
Lars Rademacher c086800e58 openocd: added opcode parser 
Added opcode parser of the F.E.H.L.E.R-project for analysis of
memory access in mmu-abort handling, tracing, etc.

Change-Id: I5912fa4a4d51ee0501817c43bae05e87ac0e9b90
2014-01-22 17:54:09 +01:00

374 lines
7.6 KiB
C
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/*
* FAME - Fault Aware Micro-hypervisor Environment
*
* Author: Andreas Heinig <andreas.heinig@gmx.de>
*
* Copyright (C) 2011,2012 Department of Computer Science,
* Design Automation of Embedded Systems Group
* Dortmund University of Technology
*
* This program is proprietary software: you must not redistribute it.
* Using this software is only allowed inside the DFG SPP1500 F.E.H.L.E.R project,
* ls12-www.cs.tu-dortmund.de/daes/forschung/dependable-embedded-real-time-systems
*
* The complete license is depicted in the LICENSE file in the top level folder.
*/
#include <stdio.h>
#include "arm-opcode.h"
#define ARCH_UNDEF_INSTRUCTION_MASK 0x0FF000F0
#define ARCH_UNDEF_INSTRUCTION_SIG 0x07F000F0
#define MEDIA_INSTRUCTION_MASK 0x0E000010
#define MEDIA_INSTRUCTION_SIG 0x06000010
int decode_load_store(arm_instruction_t * op)
{
uint32_t inst = op->inst;
/* possible registers */
uint32_t rn = (inst >> 16) & 0xF;
uint32_t rd = (inst >> 12) & 0xF;
uint32_t rs = (inst >> 8) & 0xF;
uint32_t rm = (inst) & 0xF;
/*
* Architecturally undefined instruction ?
*/
if((inst & ARCH_UNDEF_INSTRUCTION_MASK) == ARCH_UNDEF_INSTRUCTION_SIG)
{
OP_PRINTF("Architecturally Undefined Instruction\n")
return 0;
}
/*
* Media instruction ?
*/
if((inst & MEDIA_INSTRUCTION_MASK) == MEDIA_INSTRUCTION_SIG)
{
uint32_t opc = (inst >> 23) & 3;
uint32_t opc1 = (inst >> 20) & 7;
uint32_t opc2 = (inst >> 5) & 7;
if(opc == 0)
{
/* Parallel add/subtract */
switch(opc1)
{
case 1:
OP_PRINTF("S")
break;
case 2:
OP_PRINTF("Q")
break;
case 3:
OP_PRINTF("SH")
break;
case 5:
OP_PRINTF("U")
break;
case 6:
OP_PRINTF("UQ")
break;
case 7:
OP_PRINTF("UH")
break;
case 0:
case 4:
default:
printf("\n%d: CANNOT parse %08x\n", __LINE__, (unsigned int)inst);
return 1;
}
switch(opc2 & 3)
{
case 0:
OP_PRINTF("ADD")
if(opc2 & 4)
OP_PRINTF("8")
else
OP_PRINTF("16")
break;
case 1:
OP_PRINTF("ADDSUBX")
break;
case 2:
OP_PRINTF("SUBADDX")
break;
case 3:
default:
OP_PRINTF("SUB")
if(opc2 & 4)
OP_PRINTF("8")
else
OP_PRINTF("16")
break;
}
OP_PRINTF("\tR%d, R%d, R%d\n", (int)rd, (int)rn, (int)rm)
arm_op_add_reg_w(op, rd);
arm_op_add_reg_r(op, rn);
arm_op_add_reg_r(op, rm);
return 0;
}
if(opc == 1)
{
uint32_t shift_imm = (inst >> 7) & 0x1F;
if(opc1 == 0)
{
arm_op_add_reg_w(op, rd);
arm_op_add_reg_r(op, rn);
arm_op_add_reg_r(op, rm);
if(opc2 & 2)
{
if(shift_imm == 0)
shift_imm = 32;
OP_PRINTF("PKHTB\tR%d, R%d, R%d, ASR #%d\n", (int)rd, (int)rn, (int)rm, (int)shift_imm)
return 0;
}
else
{
OP_PRINTF("PKHBT\tR%d, R%d, R%d", (int)rd, (int)rn, (int)rm)
if(shift_imm)
OP_PRINTF(", LSL #%d\n", (int)shift_imm)
else
OP_PRINTF("\n")
return 0;
}
}
if((opc1 & 2) == 2 && (opc2 & 1) == 0)
{
arm_op_add_reg_w(op, rd);
arm_op_add_reg_r(op, rm);
uint32_t sat_imm = (inst >> 16) & 0x1F;
uint32_t shift_imm = (inst >> 7) & 0x1F;
if(opc1 & 4)
OP_PRINTF("U")
else
OP_PRINTF("S")
OP_PRINTF("SAT\tR%d, #%d, R%d", (int)rd, (int)sat_imm + 1, (int)rm)
if(BIT_IS_SET(6))
{
if(shift_imm == 0)
OP_PRINTF(", ASR 32\n")
else
OP_PRINTF(", ASR #%d\n", (int)shift_imm)
}
else
{
if(shift_imm == 0)
{
OP_PRINTF("\n")
}
else
{
OP_PRINTF(", LSL #%d\n", (int)shift_imm)
}
}
return 0;
}
if((opc1 & 3) == 2 && opc2 == 1)
{
arm_op_add_reg_w(op, rd);
arm_op_add_reg_r(op, rm);
uint32_t sat_imm = (inst >> 16) & 0xF;
if(opc1 & 4)
OP_PRINTF("U")
else
OP_PRINTF("S")
OP_PRINTF("SAT16\tR%d, #%d, R%d\n", (int)rd, (int)sat_imm, (int)rm)
return 0;
}
if(opc1 == 3 && opc2 == 1)
{
arm_op_add_reg_w(op, rd);
arm_op_add_reg_r(op, rm);
OP_PRINTF("REV\tR%d, R%d\n", (int)rd, (int)rm)
return 0;
}
if(opc1 == 3 && opc2 == 5)
{
arm_op_add_reg_w(op, rd);
arm_op_add_reg_r(op, rm);
OP_PRINTF("REV16\tR%d, R%d\n", (int)rd, (int)rm)
return 0;
}
if(opc1 == 7 && opc2 == 5)
{
arm_op_add_reg_w(op, rd);
arm_op_add_reg_r(op, rm);
OP_PRINTF("REVSH\tR%d, R%d\n", (int)rd, (int)rm)
return 0;
}
if(opc1 == 0 && opc2 == 5)
{
arm_op_add_reg_w(op, rd);
arm_op_add_reg_r(op, rn);
arm_op_add_reg_r(op, rm);
OP_PRINTF("SEL\tR%d, R%d, R%d\n", (int)rd, (int)rn, (int)rm)
return 0;
}
if(opc2 == 3)
{
uint32_t rotate = (inst >> 10) & 3;
if(opc1 & 4)
OP_PRINTF("U")
else
OP_PRINTF("S")
if(rn != 15)
{
arm_op_add_reg_w(op, rd);
arm_op_add_reg_r(op, rn);
arm_op_add_reg_r(op, rm);
switch(opc1 & 3)
{
case 0:
OP_PRINTF("XTAB16")
break;
case 2:
OP_PRINTF("XTAB")
break;
case 3:
OP_PRINTF("XTAH")
break;
case 1:
default:
printf("\n%d: CANNOT parse %08x\n", __LINE__, (unsigned int)inst);
return 1;
}
OP_PRINTF("\tR%d, R%d, R%d", (int)rd, (int)rn, (int)rm)
}
else
{
arm_op_add_reg_w(op, rd);
arm_op_add_reg_r(op, rm);
switch(opc1 & 3)
{
case 0:
OP_PRINTF("XTB16")
break;
case 2:
OP_PRINTF("XTB")
break;
case 3:
OP_PRINTF("XTH")
break;
case 1:
default:
printf("\n%d: CANNOT parse %08x\n", __LINE__, (unsigned int)inst);
return 1;
}
OP_PRINTF("\tR%d, R%d", (int)rd, (int)rm)
}
if(rotate == 0)
OP_PRINTF("\n")
else if(rotate == 1)
OP_PRINTF(", ROR #8\n")
else if(rotate == 2)
OP_PRINTF(", ROR #16\n")
else if(rotate == 3)
OP_PRINTF(", ROR #24\n")
return 0;
}
printf("\n%d: CANNOT parse %08x\n", __LINE__, (unsigned int)inst);
return 1;
}
if(opc == 2)
{
/* RD and RN are switched!! */
uint32_t temp = rd;
rd = rn;
rn = temp;
arm_op_add_reg_w(op, rd);
if(rn != 15)
{
arm_op_add_reg_r(op, rn);
arm_op_add_reg_r(op, rs);
arm_op_add_reg_r(op, rm);
OP_PRINTF("SML")
}
else
{
arm_op_add_reg_r(op, rs);
arm_op_add_reg_r(op, rm);
OP_PRINTF("SMU")
}
if(opc2 & 2)
OP_PRINTF("S")
else
OP_PRINTF("A")
if(opc1 & 4)
OP_PRINTF("L")
if(opc2 & 1)
OP_PRINTF("X")
if(rn != 15)
OP_PRINTF("\tR%d, R%d, R%d, R%d", (int)rd, (int)rm, (int)rs, (int)rn)
else
OP_PRINTF("\tR%d, R%d, R%d", (int)rd, (int)rm, (int)rs)
return 0;
}
if(opc == 3 && opc1 == 0 && opc2 == 0)
{
/* RD and RN are switched!! */
uint32_t temp = rd;
rd = rn;
rn = temp;
arm_op_add_reg_w(op, rd);
if(rn != 15)
{
arm_op_add_reg_r(op, rn);
arm_op_add_reg_r(op, rs);
arm_op_add_reg_r(op, rm);
OP_PRINTF("USADA8\tR%d, R%d, R%d, R%d", (int)rd, (int)rm, (int)rs, (int)rn)
}
else
{
arm_op_add_reg_r(op, rs);
arm_op_add_reg_r(op, rm);
OP_PRINTF("USAD8\tR%d, R%d, R%d", (int)rd, (int)rm, (int)rs)
}
return 0;
}
printf("\n%d: CANNOT parse %08x\n", __LINE__, (unsigned int)inst);
return 1;
}
/*
* ordinary load-store instruction
*/
if(_L_SET)
{
op->flags |= OP_FLAG_READ;
arm_op_add_reg_w(op, rd);
OP_PRINTF("LDR")
}
else
{
op->flags |= OP_FLAG_WRITE;
arm_op_add_reg_r(op, rd);
OP_PRINTF("STR")
}
if(B_SET)
{
op->mem_size = 1;
OP_PRINTF("B")
}
else
{
op->mem_size = 4;
}
if(!P_SET && W_SET)
OP_PRINTF("T")
OP_PRINTF("\tR%d, ", (int)rd)
decode_addressing_mode2(op);
OP_PRINTF("\n")
return 0;
}
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