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/*
* AVR disassembler
*
* Copyright (c) 2019-2020 Richard Henderson <rth@twiddle.net>
* Copyright (c) 2019-2020 Michael Rolnik <mrolnik@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
typedef struct {
disassemble_info *info;
uint16_t next_word;
bool next_word_used;
} DisasContext;
static int to_regs_16_31_by_one(DisasContext *ctx, int indx)
{
return 16 + (indx % 16);
}
static int to_regs_16_23_by_one(DisasContext *ctx, int indx)
{
return 16 + (indx % 8);
}
static int to_regs_24_30_by_two(DisasContext *ctx, int indx)
{
return 24 + (indx % 4) * 2;
}
static int to_regs_00_30_by_two(DisasContext *ctx, int indx)
{
return (indx % 16) * 2;
}
static uint16_t next_word(DisasContext *ctx)
{
ctx->next_word_used = true;
return ctx->next_word;
}
static int append_16(DisasContext *ctx, int x)
{
return x << 16 | next_word(ctx);
}
/* Include the auto-generated decoder. */
static bool decode_insn(DisasContext *ctx, uint16_t insn);
#include "decode_insn.inc.c"
#define output(mnemonic, format, ...) \
(pctx->info->fprintf_func(pctx->info->stream, "%-9s " format, \
mnemonic, ##__VA_ARGS__))
int avr_print_insn(bfd_vma addr, disassemble_info *info)
{
DisasContext ctx;
DisasContext *pctx = &ctx;
bfd_byte buffer[4];
uint16_t insn;
int status;
ctx.info = info;
status = info->read_memory_func(addr, buffer, 4, info);
if (status != 0) {
info->memory_error_func(status, addr, info);
return -1;
}
insn = bfd_getl16(buffer);
ctx.next_word = bfd_getl16(buffer + 2);
ctx.next_word_used = false;
if (!decode_insn(&ctx, insn)) {
output(".db", "0x%02x, 0x%02x", buffer[0], buffer[1]);
}
return ctx.next_word_used ? 4 : 2;
}
#define INSN(opcode, format, ...) \
static bool trans_##opcode(DisasContext *pctx, arg_##opcode * a) \
{ \
output(#opcode, format, ##__VA_ARGS__); \
return true; \
}
#define INSN_MNEMONIC(opcode, mnemonic, format, ...) \
static bool trans_##opcode(DisasContext *pctx, arg_##opcode * a) \
{ \
output(mnemonic, format, ##__VA_ARGS__); \
return true; \
}
/*
* C Z N V S H T I
* 0 1 2 3 4 5 6 7
*/
static const char brbc[][5] = {
"BRCC", "BRNE", "BRPL", "BRVC", "BRGE", "BRHC", "BRTC", "BRID"
};
static const char brbs[][5] = {
"BRCS", "BREQ", "BRMI", "BRVS", "BRLT", "BRHS", "BRTS", "BRIE"
};
static const char bset[][4] = {
"SEC", "SEZ", "SEN", "SEZ", "SES", "SEH", "SET", "SEI"
};
static const char bclr[][4] = {
"CLC", "CLZ", "CLN", "CLZ", "CLS", "CLH", "CLT", "CLI"
};
/*
* Arithmetic Instructions
*/
INSN(ADD, "r%d, r%d", a->rd, a->rr)
INSN(ADC, "r%d, r%d", a->rd, a->rr)
INSN(ADIW, "r%d:r%d, %d", a->rd + 1, a->rd, a->imm)
INSN(SUB, "r%d, r%d", a->rd, a->rr)
INSN(SUBI, "r%d, %d", a->rd, a->imm)
INSN(SBC, "r%d, r%d", a->rd, a->rr)
INSN(SBCI, "r%d, %d", a->rd, a->imm)
INSN(SBIW, "r%d:r%d, %d", a->rd + 1, a->rd, a->imm)
INSN(AND, "r%d, r%d", a->rd, a->rr)
INSN(ANDI, "r%d, %d", a->rd, a->imm)
INSN(OR, "r%d, r%d", a->rd, a->rr)
INSN(ORI, "r%d, %d", a->rd, a->imm)
INSN(EOR, "r%d, r%d", a->rd, a->rr)
INSN(COM, "r%d", a->rd)
INSN(NEG, "r%d", a->rd)
INSN(INC, "r%d", a->rd)
INSN(DEC, "r%d", a->rd)
INSN(MUL, "r%d, r%d", a->rd, a->rr)
INSN(MULS, "r%d, r%d", a->rd, a->rr)
INSN(MULSU, "r%d, r%d", a->rd, a->rr)
INSN(FMUL, "r%d, r%d", a->rd, a->rr)
INSN(FMULS, "r%d, r%d", a->rd, a->rr)
INSN(FMULSU, "r%d, r%d", a->rd, a->rr)
INSN(DES, "%d", a->imm)
/*
* Branch Instructions
*/
INSN(RJMP, ".%+d", a->imm * 2)
INSN(IJMP, "")
INSN(EIJMP, "")
INSN(JMP, "0x%x", a->imm * 2)
INSN(RCALL, ".%+d", a->imm * 2)
INSN(ICALL, "")
INSN(EICALL, "")
INSN(CALL, "0x%x", a->imm * 2)
INSN(RET, "")
INSN(RETI, "")
INSN(CPSE, "r%d, r%d", a->rd, a->rr)
INSN(CP, "r%d, r%d", a->rd, a->rr)
INSN(CPC, "r%d, r%d", a->rd, a->rr)
INSN(CPI, "r%d, %d", a->rd, a->imm)
INSN(SBRC, "r%d, %d", a->rr, a->bit)
INSN(SBRS, "r%d, %d", a->rr, a->bit)
INSN(SBIC, "$%d, %d", a->reg, a->bit)
INSN(SBIS, "$%d, %d", a->reg, a->bit)
INSN_MNEMONIC(BRBS, brbs[a->bit], ".%+d", a->imm * 2)
INSN_MNEMONIC(BRBC, brbc[a->bit], ".%+d", a->imm * 2)
/*
* Data Transfer Instructions
*/
INSN(MOV, "r%d, r%d", a->rd, a->rr)
INSN(MOVW, "r%d:r%d, r%d:r%d", a->rd + 1, a->rd, a->rr + 1, a->rr)
INSN(LDI, "r%d, %d", a->rd, a->imm)
INSN(LDS, "r%d, %d", a->rd, a->imm)
INSN(LDX1, "r%d, X", a->rd)
INSN(LDX2, "r%d, X+", a->rd)
INSN(LDX3, "r%d, -X", a->rd)
INSN(LDY2, "r%d, Y+", a->rd)
INSN(LDY3, "r%d, -Y", a->rd)
INSN(LDZ2, "r%d, Z+", a->rd)
INSN(LDZ3, "r%d, -Z", a->rd)
INSN(LDDY, "r%d, Y+%d", a->rd, a->imm)
INSN(LDDZ, "r%d, Z+%d", a->rd, a->imm)
INSN(STS, "%d, r%d", a->imm, a->rd)
INSN(STX1, "X, r%d", a->rr)
INSN(STX2, "X+, r%d", a->rr)
INSN(STX3, "-X, r%d", a->rr)
INSN(STY2, "Y+, r%d", a->rd)
INSN(STY3, "-Y, r%d", a->rd)
INSN(STZ2, "Z+, r%d", a->rd)
INSN(STZ3, "-Z, r%d", a->rd)
INSN(STDY, "Y+%d, r%d", a->imm, a->rd)
INSN(STDZ, "Z+%d, r%d", a->imm, a->rd)
INSN(LPM1, "")
INSN(LPM2, "r%d, Z", a->rd)
INSN(LPMX, "r%d, Z+", a->rd)
INSN(ELPM1, "")
INSN(ELPM2, "r%d, Z", a->rd)
INSN(ELPMX, "r%d, Z+", a->rd)
INSN(SPM, "")
INSN(SPMX, "Z+")
INSN(IN, "r%d, $%d", a->rd, a->imm)
INSN(OUT, "$%d, r%d", a->imm, a->rd)
INSN(PUSH, "r%d", a->rd)
INSN(POP, "r%d", a->rd)
INSN(XCH, "Z, r%d", a->rd)
INSN(LAC, "Z, r%d", a->rd)
INSN(LAS, "Z, r%d", a->rd)
INSN(LAT, "Z, r%d", a->rd)
/*
* Bit and Bit-test Instructions
*/
INSN(LSR, "r%d", a->rd)
INSN(ROR, "r%d", a->rd)
INSN(ASR, "r%d", a->rd)
INSN(SWAP, "r%d", a->rd)
INSN(SBI, "$%d, %d", a->reg, a->bit)
INSN(CBI, "%d, %d", a->reg, a->bit)
INSN(BST, "r%d, %d", a->rd, a->bit)
INSN(BLD, "r%d, %d", a->rd, a->bit)
INSN_MNEMONIC(BSET, bset[a->bit], "")
INSN_MNEMONIC(BCLR, bclr[a->bit], "")
/*
* MCU Control Instructions
*/
INSN(BREAK, "")
INSN(NOP, "")
INSN(SLEEP, "")
INSN(WDR, "")
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