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qemu/disas/lm32.c
Michael Walle ab2b9f174d lm32-dis: fix NULL pointer dereference 
Signed-off-by: Michael Walle <michael@walle.cc>
2013-03-18 19:40:34 +01:00

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/*
* Simple LatticeMico32 disassembler.
*
* Copyright (c) 2012 Michael Walle <michael@walle.cc>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include "disas/bfd.h"
typedef enum {
LM32_OP_SRUI = 0, LM32_OP_NORI, LM32_OP_MULI, LM32_OP_SH, LM32_OP_LB,
LM32_OP_SRI, LM32_OP_XORI, LM32_OP_LH, LM32_OP_ANDI, LM32_OP_XNORI,
LM32_OP_LW, LM32_OP_LHU, LM32_OP_SB, LM32_OP_ADDI, LM32_OP_ORI,
LM32_OP_SLI, LM32_OP_LBU, LM32_OP_BE, LM32_OP_BG, LM32_OP_BGE,
LM32_OP_BGEU, LM32_OP_BGU, LM32_OP_SW, LM32_OP_BNE, LM32_OP_ANDHI,
LM32_OP_CMPEI, LM32_OP_CMPGI, LM32_OP_CMPGEI, LM32_OP_CMPGEUI,
LM32_OP_CMPGUI, LM32_OP_ORHI, LM32_OP_CMPNEI, LM32_OP_SRU, LM32_OP_NOR,
LM32_OP_MUL, LM32_OP_DIVU, LM32_OP_RCSR, LM32_OP_SR, LM32_OP_XOR,
LM32_OP_ILL0, LM32_OP_AND, LM32_OP_XNOR, LM32_OP_ILL1, LM32_OP_SCALL,
LM32_OP_SEXTB, LM32_OP_ADD, LM32_OP_OR, LM32_OP_SL, LM32_OP_B,
LM32_OP_MODU, LM32_OP_SUB, LM32_OP_ILL2, LM32_OP_WCSR, LM32_OP_ILL3,
LM32_OP_CALL, LM32_OP_SEXTH, LM32_OP_BI, LM32_OP_CMPE, LM32_OP_CMPG,
LM32_OP_CMPGE, LM32_OP_CMPGEU, LM32_OP_CMPGU, LM32_OP_CALLI, LM32_OP_CMPNE,
} Lm32Opcode;
typedef enum {
FMT_INVALID = 0, FMT_RRI5, FMT_RRI16, FMT_IMM26, FMT_LOAD, FMT_STORE,
FMT_RRR, FMT_R, FMT_RNR, FMT_CRN, FMT_CNR, FMT_BREAK,
} Lm32OpcodeFmt;
typedef enum {
LM32_CSR_IE = 0, LM32_CSR_IM, LM32_CSR_IP, LM32_CSR_ICC, LM32_CSR_DCC,
LM32_CSR_CC, LM32_CSR_CFG, LM32_CSR_EBA, LM32_CSR_DC, LM32_CSR_DEBA,
LM32_CSR_CFG2, LM32_CSR_JTX = 0xe, LM32_CSR_JRX, LM32_CSR_BP0,
LM32_CSR_BP1, LM32_CSR_BP2, LM32_CSR_BP3, LM32_CSR_WP0 = 0x18,
LM32_CSR_WP1, LM32_CSR_WP2, LM32_CSR_WP3,
} Lm32CsrNum;
typedef struct {
int csr;
const char *name;
} Lm32CsrInfo;
static const Lm32CsrInfo lm32_csr_info[] = {
{LM32_CSR_IE, "ie", },
{LM32_CSR_IM, "im", },
{LM32_CSR_IP, "ip", },
{LM32_CSR_ICC, "icc", },
{LM32_CSR_DCC, "dcc", },
{LM32_CSR_CC, "cc", },
{LM32_CSR_CFG, "cfg", },
{LM32_CSR_EBA, "eba", },
{LM32_CSR_DC, "dc", },
{LM32_CSR_DEBA, "deba", },
{LM32_CSR_CFG2, "cfg2", },
{LM32_CSR_JTX, "jtx", },
{LM32_CSR_JRX, "jrx", },
{LM32_CSR_BP0, "bp0", },
{LM32_CSR_BP1, "bp1", },
{LM32_CSR_BP2, "bp2", },
{LM32_CSR_BP3, "bp3", },
{LM32_CSR_WP0, "wp0", },
{LM32_CSR_WP1, "wp1", },
{LM32_CSR_WP2, "wp2", },
{LM32_CSR_WP3, "wp3", },
};
static const Lm32CsrInfo *find_csr_info(int csr)
{
const Lm32CsrInfo *info;
int i;
for (i = 0; i < ARRAY_SIZE(lm32_csr_info); i++) {
info = &lm32_csr_info[i];
if (csr == info->csr) {
return info;
}
}
return NULL;
}
typedef struct {
int reg;
const char *name;
} Lm32RegInfo;
typedef enum {
LM32_REG_R0 = 0, LM32_REG_R1, LM32_REG_R2, LM32_REG_R3, LM32_REG_R4,
LM32_REG_R5, LM32_REG_R6, LM32_REG_R7, LM32_REG_R8, LM32_REG_R9,
LM32_REG_R10, LM32_REG_R11, LM32_REG_R12, LM32_REG_R13, LM32_REG_R14,
LM32_REG_R15, LM32_REG_R16, LM32_REG_R17, LM32_REG_R18, LM32_REG_R19,
LM32_REG_R20, LM32_REG_R21, LM32_REG_R22, LM32_REG_R23, LM32_REG_R24,
LM32_REG_R25, LM32_REG_GP, LM32_REG_FP, LM32_REG_SP, LM32_REG_RA,
LM32_REG_EA, LM32_REG_BA,
} Lm32RegNum;
static const Lm32RegInfo lm32_reg_info[] = {
{LM32_REG_R0, "r0", },
{LM32_REG_R1, "r1", },
{LM32_REG_R2, "r2", },
{LM32_REG_R3, "r3", },
{LM32_REG_R4, "r4", },
{LM32_REG_R5, "r5", },
{LM32_REG_R6, "r6", },
{LM32_REG_R7, "r7", },
{LM32_REG_R8, "r8", },
{LM32_REG_R9, "r9", },
{LM32_REG_R10, "r10", },
{LM32_REG_R11, "r11", },
{LM32_REG_R12, "r12", },
{LM32_REG_R13, "r13", },
{LM32_REG_R14, "r14", },
{LM32_REG_R15, "r15", },
{LM32_REG_R16, "r16", },
{LM32_REG_R17, "r17", },
{LM32_REG_R18, "r18", },
{LM32_REG_R19, "r19", },
{LM32_REG_R20, "r20", },
{LM32_REG_R21, "r21", },
{LM32_REG_R22, "r22", },
{LM32_REG_R23, "r23", },
{LM32_REG_R24, "r24", },
{LM32_REG_R25, "r25", },
{LM32_REG_GP, "gp", },
{LM32_REG_FP, "fp", },
{LM32_REG_SP, "sp", },
{LM32_REG_RA, "ra", },
{LM32_REG_EA, "ea", },
{LM32_REG_BA, "ba", },
};
static const Lm32RegInfo *find_reg_info(int reg)
{
assert(ARRAY_SIZE(lm32_reg_info) == 32);
return &lm32_reg_info[reg & 0x1f];
}
typedef struct {
struct {
uint32_t code;
uint32_t mask;
} op;
const char *name;
const char *args_fmt;
} Lm32OpcodeInfo;
static const Lm32OpcodeInfo lm32_opcode_info[] = {
/* pseudo instructions */
{{0x34000000, 0xffffffff}, "nop", NULL},
{{0xac000002, 0xffffffff}, "break", NULL},
{{0xac000003, 0xffffffff}, "scall", NULL},
{{0xc3e00000, 0xffffffff}, "bret", NULL},
{{0xc3c00000, 0xffffffff}, "eret", NULL},
{{0xc3a00000, 0xffffffff}, "ret", NULL},
{{0xa4000000, 0xfc1f07ff}, "not", "%2, %0"},
{{0xb8000000, 0xfc1f07ff}, "mv", "%2, %0"},
{{0x71e00000, 0xffe00000}, "mvhi", "%1, %u"},
{{0x34000000, 0xffe00000}, "mvi", "%1, %s"},
#define _O(op) {op << 26, 0x3f << 26}
/* regular opcodes */
{_O(LM32_OP_ADD), "add", "%2, %0, %1" },
{_O(LM32_OP_ADDI), "addi", "%1, %0, %s" },
{_O(LM32_OP_AND), "and", "%2, %0, %1" },
{_O(LM32_OP_ANDHI), "andhi", "%1, %0, %u" },
{_O(LM32_OP_ANDI), "andi", "%1, %0, %u" },
{_O(LM32_OP_B), "b", "%0", },
{_O(LM32_OP_BE), "be", "%1, %0, %r" },
{_O(LM32_OP_BG), "bg", "%1, %0, %r" },
{_O(LM32_OP_BGE), "bge", "%1, %0, %r" },
{_O(LM32_OP_BGEU), "bgeu", "%1, %0, %r" },
{_O(LM32_OP_BGU), "bgu", "%1, %0, %r" },
{_O(LM32_OP_BI), "bi", "%R", },
{_O(LM32_OP_BNE), "bne", "%1, %0, %r" },
{_O(LM32_OP_CALL), "call", "%0", },
{_O(LM32_OP_CALLI), "calli", "%R", },
{_O(LM32_OP_CMPE), "cmpe", "%2, %0, %1" },
{_O(LM32_OP_CMPEI), "cmpei", "%1, %0, %s" },
{_O(LM32_OP_CMPG), "cmpg", "%2, %0, %1" },
{_O(LM32_OP_CMPGE), "cmpge", "%2, %0, %1" },
{_O(LM32_OP_CMPGEI), "cmpgei", "%1, %0, %s" },
{_O(LM32_OP_CMPGEU), "cmpgeu", "%2, %0, %1" },
{_O(LM32_OP_CMPGEUI), "cmpgeui", "%1, %0, %s" },
{_O(LM32_OP_CMPGI), "cmpgi", "%1, %0, %s" },
{_O(LM32_OP_CMPGU), "cmpgu", "%2, %0, %1" },
{_O(LM32_OP_CMPGUI), "cmpgui", "%1, %0, %s" },
{_O(LM32_OP_CMPNE), "cmpne", "%2, %0, %1" },
{_O(LM32_OP_CMPNEI), "cmpnei", "%1, %0, %s" },
{_O(LM32_OP_DIVU), "divu", "%2, %0, %1" },
{_O(LM32_OP_LB), "lb", "%1, (%0+%s)" },
{_O(LM32_OP_LBU), "lbu", "%1, (%0+%s)" },
{_O(LM32_OP_LH), "lh", "%1, (%0+%s)" },
{_O(LM32_OP_LHU), "lhu", "%1, (%0+%s)" },
{_O(LM32_OP_LW), "lw", "%1, (%0+%s)" },
{_O(LM32_OP_MODU), "modu", "%2, %0, %1" },
{_O(LM32_OP_MULI), "muli", "%1, %0, %s" },
{_O(LM32_OP_MUL), "mul", "%2, %0, %1" },
{_O(LM32_OP_NORI), "nori", "%1, %0, %u" },
{_O(LM32_OP_NOR), "nor", "%2, %0, %1" },
{_O(LM32_OP_ORHI), "orhi", "%1, %0, %u" },
{_O(LM32_OP_ORI), "ori", "%1, %0, %u" },
{_O(LM32_OP_OR), "or", "%2, %0, %1" },
{_O(LM32_OP_RCSR), "rcsr", "%2, %c", },
{_O(LM32_OP_SB), "sb", "(%0+%s), %1" },
{_O(LM32_OP_SEXTB), "sextb", "%2, %0", },
{_O(LM32_OP_SEXTH), "sexth", "%2, %0", },
{_O(LM32_OP_SH), "sh", "(%0+%s), %1" },
{_O(LM32_OP_SLI), "sli", "%1, %0, %h" },
{_O(LM32_OP_SL), "sl", "%2, %0, %1" },
{_O(LM32_OP_SRI), "sri", "%1, %0, %h" },
{_O(LM32_OP_SR), "sr", "%2, %0, %1" },
{_O(LM32_OP_SRUI), "srui", "%1, %0, %d" },
{_O(LM32_OP_SRU), "sru", "%2, %0, %s" },
{_O(LM32_OP_SUB), "sub", "%2, %0, %s" },
{_O(LM32_OP_SW), "sw", "(%0+%s), %1" },
{_O(LM32_OP_WCSR), "wcsr", "%c, %1", },
{_O(LM32_OP_XNORI), "xnori", "%1, %0, %u" },
{_O(LM32_OP_XNOR), "xnor", "%2, %0, %1" },
{_O(LM32_OP_XORI), "xori", "%1, %0, %u" },
{_O(LM32_OP_XOR), "xor", "%2, %0, %1" },
#undef _O
};
static const Lm32OpcodeInfo *find_opcode_info(uint32_t opcode)
{
const Lm32OpcodeInfo *info;
int i;
for (i = 0; i < ARRAY_SIZE(lm32_opcode_info); i++) {
info = &lm32_opcode_info[i];
if ((opcode & info->op.mask) == info->op.code) {
return info;
}
}
return NULL;
}
int print_insn_lm32(bfd_vma memaddr, struct disassemble_info *info)
{
fprintf_function fprintf_fn = info->fprintf_func;
void *stream = info->stream;
int rc;
uint8_t insn[4];
const Lm32OpcodeInfo *opc_info;
uint32_t op;
const char *args_fmt;
rc = info->read_memory_func(memaddr, insn, 4, info);
if (rc != 0) {
info->memory_error_func(rc, memaddr, info);
return -1;
}
fprintf_fn(stream, "%02x %02x %02x %02x ",
insn[0], insn[1], insn[2], insn[3]);
op = bfd_getb32(insn);
opc_info = find_opcode_info(op);
if (opc_info) {
fprintf_fn(stream, "%-8s ", opc_info->name);
args_fmt = opc_info->args_fmt;
while (args_fmt && *args_fmt) {
if (*args_fmt == '%') {
switch (*(++args_fmt)) {
case '0': {
uint8_t r0;
const char *r0_name;
r0 = (op >> 21) & 0x1f;
r0_name = find_reg_info(r0)->name;
fprintf_fn(stream, "%s", r0_name);
break;
}
case '1': {
uint8_t r1;
const char *r1_name;
r1 = (op >> 16) & 0x1f;
r1_name = find_reg_info(r1)->name;
fprintf_fn(stream, "%s", r1_name);
break;
}
case '2': {
uint8_t r2;
const char *r2_name;
r2 = (op >> 11) & 0x1f;
r2_name = find_reg_info(r2)->name;
fprintf_fn(stream, "%s", r2_name);
break;
}
case 'c': {
uint8_t csr;
const Lm32CsrInfo *info;
csr = (op >> 21) & 0x1f;
info = find_csr_info(csr);
if (info) {
fprintf_fn(stream, "%s", info->name);
} else {
fprintf_fn(stream, "0x%x", csr);
}
break;
}
case 'u': {
uint16_t u16;
u16 = op & 0xffff;
fprintf_fn(stream, "0x%x", u16);
break;
}
case 's': {
int16_t s16;
s16 = (int16_t)(op & 0xffff);
fprintf_fn(stream, "%d", s16);
break;
}
case 'r': {
uint32_t rela;
rela = memaddr + (((int16_t)(op & 0xffff)) << 2);
fprintf_fn(stream, "%x", rela);
break;
}
case 'R': {
uint32_t rela;
int32_t imm26;
imm26 = (int32_t)((op & 0x3ffffff) << 6) >> 4;
rela = memaddr + imm26;
fprintf_fn(stream, "%x", rela);
break;
}
case 'h': {
uint8_t u5;
u5 = (op & 0x1f);
fprintf_fn(stream, "%d", u5);
break;
}
default:
break;
}
} else {
fprintf_fn(stream, "%c", *args_fmt);
}
args_fmt++;
}
} else {
fprintf_fn(stream, ".word 0x%x", op);
}
return 4;
}
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