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/* SPDX-License-Identifier: copyleft-next-0.3.1 */
#include <tdump/disassembler.h>
#include <limits.h>
#include <bits.h>
struct disasm_ctx {
const uint32_t *buf;
size_t pc;
size_t len;
};
static const char *get_gpr(tri_t x)
{
switch (x) {
case X0: return "x0";
case X1: return "sp";
case X2: return "fp";
case X3: return "gp";
case X4: return "a0";
case X5: return "a1";
case X6: return "a2";
case X7: return "a3";
case X8: return "a4";
case X9: return "a5";
case X10: return "a6";
case X11: return "t0";
case X12: return "t1";
case X13: return "t2";
case X14: return "t3";
case X15: return "t4";
case X16: return "t5";
case X17: return "t6";
case X18: return "s0";
case X19: return "s1";
case X20: return "s2";
case X21: return "s3";
case X22: return "s4";
case X23: return "s5";
case X24: return "s6";
case X25: return "tp";
case X26: return "ra";
case X27: return "a7";
case X28: return "a8";
case X29: return "a9";
case X30: return "a10";
case X31: return "a11";
case X32: return "a12";
case X33: return "a13";
case X34: return "a14";
case X35: return "a15";
case X36: return "a16";
case X37: return "a17";
case X38: return "a18";
case X39: return "a19";
case X40: return "a20";
case X41: return "a21";
case X42: return "a22";
case X43: return "a23";
case X44: return "a24";
case X45: return "t7";
case X46: return "t8";
case X47: return "t9";
case X48: return "t10";
case X49: return "t11";
case X50: return "t12";
case X51: return "t13";
case X52: return "t14";
case X53: return "t15";
case X54: return "t16";
case X55: return "t17";
case X56: return "t18";
case X57: return "t19";
case X58: return "t20";
case X59: return "t21";
case X60: return "t22";
case X61: return "t23";
case X62: return "t24";
case X63: return "s7";
case X64: return "s8";
case X65: return "s9";
case X66: return "s10";
case X67: return "s11";
case X68: return "s12";
case X69: return "s13";
case X70: return "s14";
case X71: return "s15";
case X72: return "s16";
case X73: return "s17";
case X74: return "s18";
case X75: return "s19";
case X76: return "s20";
case X77: return "s21";
case X78: return "s22";
case X79: return "s23";
case X80: return "s24";
default: return "ill";
}
}
static void *read_object_file(const char *file, size_t *len)
{
FILE *f = fopen(file, "rb");
if (!f) {
fprintf(stderr, "failed opening simulation file %s\n", file);
return NULL;
}
fseek(f, 0, SEEK_END);
long s = ftell(f);
if (s == LONG_MAX) {
fprintf(stderr, "unable to get file size of %s\n", file);
return NULL;
}
if (len)
*len = s;
fseek(f, 0, SEEK_SET);
char *buf = malloc(s);
if (!buf)
return NULL;
fread(buf, s, 1, f);
fclose(f);
return buf;
}
#define DEFAULT_PREFIX "%zu\t"
static void disasm_lui(struct disasm_ctx *ctx, tri_t i)
{
tri_t rd, imm18;
parse_u(i, &rd, &imm18);
char imm[256];
size_t l = tri_fmt_default(imm, 256, imm18);
imm[l] = '\0';
printf(DEFAULT_PREFIX "lui %s, %s\n",
ctx->pc, get_gpr(rd), imm);
}
static void disasm_store(struct disasm_ctx *ctx, tri_t i)
{
tri_t imm4, fn0, rs1, rs2, imm5;
parse_s(i, &imm4, &fn0, &rs1, &rs2, &imm5);
tri_t imm9 = tri_sl(imm4, 5) | imm5;
int w = tri_get_trit(fn0, 4);
char *width = NULL;
switch (w) {
case 0: width = "t"; break;
case 1: width = "w"; break;
default: width = "ill"; break;
}
char imm[256];
size_t l = tri_fmt_default(imm, 256, imm9);
imm[l] = '\0';
printf(DEFAULT_PREFIX "st %s, %s, %s(%s)\n",
ctx->pc, width, get_gpr(rs1), imm, get_gpr(rs2));
}
static void disasm_load(struct disasm_ctx *ctx, tri_t i)
{
tri_t rd, fn0, rs1, imm9;
parse_i(i, &rd, &fn0, &rs1, &imm9);
int w = tri_get_trit(fn0, 4);
char *width = NULL;
switch (w) {
case 0: width = "t"; break;
case 1: width = "w"; break;
default: width = "ill"; break;
}
char imm[256];
size_t l = tri_fmt_default(imm, 256, imm9);
imm[l] = '\0';
printf(DEFAULT_PREFIX "ld %s, %s, %s(%s)\n",
ctx->pc, width, get_gpr(rd), imm, get_gpr(rs1));
}
static void disasm_op_imm(struct disasm_ctx *ctx, tri_t i)
{
tri_t rd, fn0, rs1, imm9;
parse_i(i, &rd, &fn0, &rs1, &imm9);
char imm[256];
size_t l = tri_fmt_default(imm, 256, imm9);
imm[l] = '\0';
switch (fn0) {
case OP_IMM_ADDI:
printf(DEFAULT_PREFIX "addi %s, %s, %s\n",
ctx->pc, get_gpr(rd), get_gpr(rs1), imm);
break;
default:
printf(DEFAULT_PREFIX "unknown/unimp op_imm\n",
ctx->pc);
}
}
static void disasm_op(struct disasm_ctx *ctx, tri_t i)
{
tri_t rd, fn0, rs1, rs2, fn5;
parse_r(i, &rd, &fn0, &rs1, &rs2, &fn5);
switch (fn5) {
case 0:
switch (fn0) {
case OP_ADD:
printf(DEFAULT_PREFIX "add %s, %s, %s\n",
ctx->pc,
get_gpr(rd),
get_gpr(rs1),
get_gpr(rs2));
break;
case OP_SUB:
printf(DEFAULT_PREFIX "sub %s, %s, %s\n",
ctx->pc,
get_gpr(rd),
get_gpr(rs1),
get_gpr(rs2));
break;
default:
printf(DEFAULT_PREFIX "unknown/unimp op\n",
ctx->pc);
}
break;
default: printf(DEFAULT_PREFIX "unknown/unimp op metaclass\n",
ctx->pc);
}
}
static void disasm_jalr(struct disasm_ctx *ctx, tri_t i)
{
tri_t rd, fn0, rs1, imm9;
parse_i(i, &rd, &fn0, &rs1, &imm9);
char imm[256];
size_t l = tri_fmt_default(imm, 256, imm9);
imm[l] = '\0';
switch (fn0) {
case 0:
printf(DEFAULT_PREFIX "jalr %s, %s(%s)\n",
ctx->pc, get_gpr(rd), imm, get_gpr(rs1));
break;
default: printf(DEFAULT_PREFIX "unknown/unimp jalr\n", ctx->pc);
}
}
static void disasm_branch(struct disasm_ctx *ctx, tri_t i)
{
tri_t imm4, fn0, rs1, rs2, imm5;
parse_s(i, &imm4, &fn0, &rs1, &rs2, &imm5);
tri_t imm9 = tri_sl(imm4, 5) | imm5;
char imm[256];
size_t l = tri_fmt_default(imm, 256, imm9);
imm[l] = '\0';
switch (fn0) {
case BRANCH_BLT:
printf(DEFAULT_PREFIX "blt %s, %s, %s\n",
ctx->pc, get_gpr(rs1), get_gpr(rs2), imm);
break;
default: printf(DEFAULT_PREFIX "unknown/unimp branch\n", ctx->pc);
}
}
static void disasm_auipc(struct disasm_ctx *ctx, tri_t i)
{
tri_t rd, imm18;
parse_u(i, &rd, &imm18);
char imm[256];
size_t l = tri_fmt_default(imm, 256, imm18);
imm[l] = '\0';
printf(DEFAULT_PREFIX "auipc %s, %s\n",
ctx->pc, get_gpr(rd), imm);
}
static tri_t read1(struct disasm_ctx *ctx, size_t off)
{
tri_t t = (tri_t)ctx->buf[off];
return tri_mask(t, 9);
}
static tri_t read3(struct disasm_ctx *ctx, size_t off)
{
tri_t t0 = read1(ctx, off + 0);
tri_t t1 = read1(ctx, off + 1);
tri_t t2 = read1(ctx, off + 2);
return t0 | tri_sl(t1, 9) | tri_sl(t2, 18);
}
int disassemble(const char *file)
{
size_t len = 0;
const uint32_t *buf = read_object_file(file, &len);
/* somewhat specific but we know that each tryte is mapped to uin32_t */
struct disasm_ctx ctx = {.buf = buf, .pc = 0,
.len = len / sizeof(uint32_t)};
while (ctx.pc < ctx.len) {
tri_t i = read3(&ctx, ctx.pc);
switch (parse_opcode(i)) {
case OPCODE_LUI: disasm_lui(&ctx, i); break;
case OPCODE_STORE: disasm_store(&ctx, i); break;
case OPCODE_LOAD: disasm_load(&ctx, i); break;
//case OPCODE_SYSTEM: disasm_system(&ctx, i); break;
case OPCODE_OP_IMM: disasm_op_imm(&ctx, i); break;
case OPCODE_OP: disasm_op(&ctx, i); break;
case OPCODE_JALR: disasm_jalr(&ctx, i); break;
case OPCODE_BRANCH: disasm_branch(&ctx, i); break;
case OPCODE_AUIPC: disasm_auipc(&ctx, i); break;
default:
printf(DEFAULT_PREFIX "unimp/illegal\n", ctx.pc);
break;
}
ctx.pc += 3;
}
free((void *)buf);
return 0;
}
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