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r3000d.c
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r3000d.c
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// license:MIT
// copyright-holders:Lisandro Alarcon (Allkern)
/**
* @file r3000d.c
* @brief Disassembler for MIPS R3000A compatible code
* @author Allkern (https://github.com/allkern)
*/
#include <stdint.h>
#include <stdio.h>
#include "r3000d.h"
#define OP ((opcode >> 26) & 0x3f)
#define S ((opcode >> 21) & 0x1f)
#define T ((opcode >> 16) & 0x1f)
#define D ((opcode >> 11) & 0x1f)
#define IMM5 ((opcode >> 6) & 0x1f)
#define CMT ((opcode >> 6) & 0xfffff)
#define SOP (opcode & 0x3f)
#define IMM26 (opcode & 0x3ffffff)
#define IMM16 (opcode & 0xffff)
#define IMM16S ((int32_t)((int16_t)IMM16))
const char* invalid = "";
static const char* r3000_secondary_table[] = {
"sll" , "invalid", "srl" , "sra" ,
"sllv" , "invalid", "srlv" , "srav" ,
"jr" , "jalr" , "invalid", "invalid",
"syscall", "break" , "invalid", "invalid",
"mfhi" , "mthi" , "mflo" , "mtlo" ,
"invalid", "invalid", "invalid", "invalid",
"mult" , "multu" , "div" , "divu" ,
"invalid", "invalid", "invalid", "invalid",
"add" , "addu" , "sub" , "subu" ,
"and" , "or" , "xor" , "nor" ,
"invalid", "invalid", "slt" , "sltu" ,
"invalid", "invalid", "invalid", "invalid",
"invalid", "invalid", "invalid", "invalid",
"invalid", "invalid", "invalid", "invalid",
"invalid", "invalid", "invalid", "invalid",
"invalid", "invalid", "invalid", "invalid"
};
static const char* r3000_primary_table[] = {
"special", "bxx" , "j" , "jal" ,
"beq" , "bne" , "blez" , "bgtz" ,
"addi" , "addiu" , "slti" , "sltiu" ,
"andi" , "ori" , "xori" , "lui" ,
"cop0" , "cop1" , "cop2" , "cop3" ,
"invalid", "invalid", "invalid", "invalid",
"invalid", "invalid", "invalid", "invalid",
"invalid", "invalid", "invalid", "invalid",
"lb" , "lh" , "lwl" , "lw" ,
"lbu" , "lhu" , "lwr" , "invalid",
"sb" , "sh" , "swl" , "sw" ,
"invalid", "invalid", "swr" , "invalid",
"lwc0" , "lwc1" , "lwc2" , "lwc3" ,
"invalid", "invalid", "invalid", "invalid",
"swc0" , "swc1" , "swc2" , "swc3" ,
"invalid", "invalid", "invalid", "invalid"
};
static const char* r3000_cop0_table[] = {
"mfc0" , "invalid", "invalid", "invalid",
"mtc0" , "invalid", "invalid", "invalid",
"invalid", "invalid", "invalid", "invalid",
"invalid", "invalid", "invalid", "invalid",
"rfe" , "invalid", "invalid", "invalid",
"invalid", "invalid", "invalid", "invalid",
"invalid", "invalid", "invalid", "invalid",
"invalid", "invalid", "invalid", "invalid"
};
static const char* r3000_cop2_table[] = {
"mfc2" , "invalid", "cfc2" , "invalid",
"mtc2" , "invalid", "ctc2" , "invalid",
"invalid", "invalid", "invalid", "invalid",
"invalid", "invalid", "invalid", "invalid",
"gte" , "gte" , "gte" , "gte" ,
"gte" , "gte" , "gte" , "gte" ,
"gte" , "gte" , "gte" , "gte" ,
"gte" , "gte" , "gte" , "gte"
};
static const char* r3000_bxx_table[] = {
"bltz" , "bgez" , "bltz" , "bgez" ,
"bltz" , "bgez" , "bltz" , "bgez" ,
"bltz" , "bgez" , "bltz" , "bgez" ,
"bltz" , "bgez" , "bltz" , "bgez" ,
"bltzal" , "bgezal" , "bltz" , "bgez" ,
"bltz" , "bgez" , "bltz" , "bgez" ,
"bltz" , "bgez" , "bltz" , "bgez" ,
"bltz" , "bgez" , "bltz" , "bgez"
};
static const char* r3000_register_names[] = {
"r0", "at", "v0", "v1", "a0", "a1", "a2", "a3",
"t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7",
"s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
"t8", "t9", "k0", "k1", "gp", "sp", "fp", "ra"
};
static const char* r3000_cop0_register_names[] = {
"Index",
"Random",
"EntryLo",
"BPC",
"Context",
"BDA",
"JUMPDEST",
"DCIC",
"BadVAddr",
"BDAM",
"EntryHi",
"BPCM",
"SR",
"Cause",
"EPC",
"PRId",
"r16",
"r17",
"r18",
"r19",
"r20",
"r21",
"r22",
"r23",
"r24",
"r25",
"r26",
"r27",
"r28",
"r29",
"r30",
"r31",
"r32",
"r33",
"r34",
"r35",
"r36",
"r37",
"r38",
"r39",
"r40",
"r41",
"r42",
"r43",
"r44",
"r45",
"r46",
"r47"
};
char* disassemble_secondary(char* buf, uint32_t opcode, r3000d_state* state) {
char* ptr = buf;
int sop = SOP;
switch (sop) {
case 0:
case 2:
case 3:
sprintf(ptr,
"%-8s $%s, $%s, %u",
r3000_secondary_table[sop],
r3000_register_names[D],
r3000_register_names[T],
IMM5
);
break;
case 4:
case 6:
case 7:
sprintf(ptr,
"%-8s $%s, $%s, $%s",
r3000_secondary_table[sop],
r3000_register_names[D],
r3000_register_names[T],
r3000_register_names[S]
);
break;
case 9:
sprintf(ptr,
"%-8s $%s, $%s",
r3000_secondary_table[sop],
r3000_register_names[S],
r3000_register_names[D]
);
break;
case 12:
case 13:
sprintf(ptr,
"%-8s 0x%x",
r3000_secondary_table[sop],
CMT
);
break;
case 16:
sprintf(ptr,
"%-8s 0x%x",
r3000_cop0_table[sop],
CMT
);
break;
case 18:
sprintf(ptr,
"%-8s $%s",
r3000_secondary_table[sop],
r3000_register_names[D]
);
break;
case 8:
case 17:
case 19:
sprintf(ptr,
"%-8s $%s",
r3000_secondary_table[sop],
r3000_register_names[S]
);
break;
case 24:
case 25:
case 26:
case 27:
sprintf(ptr,
"%-8s $%s, $%s",
r3000_secondary_table[sop],
r3000_register_names[S],
r3000_register_names[T]
);
break;
case 32:
case 33:
case 34:
case 35:
case 36:
case 37:
case 38:
case 39:
case 42:
case 43:
sprintf(ptr,
"%-8s $%s, $%s, $%s",
r3000_secondary_table[sop],
r3000_register_names[D],
r3000_register_names[S],
r3000_register_names[T]
);
break;
default:
sprintf(ptr, "<invalid>");
break;
}
}
char* r3000d_disassemble(char* buf, uint32_t opcode, r3000d_state* state) {
char* ptr = buf;
if (state) if (state->print_address)
ptr += sprintf(ptr, "%08x: ", state->addr);
if (state) if (state->print_opcode)
ptr += sprintf(ptr, "%08x ", opcode);
int op = OP;
switch (op) {
case 0:
disassemble_secondary(ptr, opcode, state);
break;
case 1:
sprintf(ptr,
(IMM16S >= 0) ? "%-8s $%s, 0x%04x" : "%-8s $%s, -0x%04x",
r3000_bxx_table[T],
r3000_register_names[S],
(IMM16S >= 0) ? IMM16S : ((~IMM16S) + 1)
);
break;
case 2:
case 3:
sprintf(ptr, "%-8s 0x%08x",
r3000_primary_table[op],
(state ? (state->addr & 0xf0000000) : 0) |
(IMM26 << 2)
);
break;
case 4:
case 5:
sprintf(ptr,
(IMM16S >= 0) ? "%-8s $%s, $%s, 0x%04x" : "%-8s $%s, $%s, -0x%04x",
r3000_primary_table[op],
r3000_register_names[S],
r3000_register_names[T],
(IMM16S >= 0 ? IMM16S : ~IMM16S) << 2
);
break;
case 6:
case 7:
sprintf(ptr,
(IMM16S >= 0) ? "%-8s $%s, 0x%04x" : "%-8s $%s, -0x%04x",
r3000_primary_table[op],
r3000_register_names[S],
(IMM16S >= 0) ? IMM16S : ((~IMM16S) + 1)
);
break;
case 8:
case 9:
case 10:
case 11:
case 12:
case 13:
case 14:
sprintf(ptr, "%-8s $%s, $%s, 0x%+x",
r3000_primary_table[op],
r3000_register_names[T],
r3000_register_names[S],
IMM16S
);
break;
case 15:
sprintf(ptr, "%-8s $%s, 0x%04x",
r3000_primary_table[op],
r3000_register_names[T],
IMM16
);
break;
case 16: {
int s = S;
sprintf(ptr,
s == 16 ? "%-8s" : "%-8s $%s, $Cop0_%s",
r3000_cop0_table[s],
r3000_register_names[T],
r3000_cop0_register_names[D]
);
} break;
/* To-do: case 18 (COP2, GTE) */
case 18:
sprintf(ptr, "<gte-unimplemented>");
break;
case 32:
case 33:
case 34:
case 35:
case 36:
case 37:
case 38:
case 40:
case 41:
case 42:
case 43:
case 46:
case 48:
case 49:
case 50:
case 51:
case 56:
case 57:
case 58:
case 59: {
const char* fmt = "%-8s $%s, %i($%s)";
if (state) if (state->hex_memory_offset)
fmt = "%-8s $%s, 0x%04x($%s)";
sprintf(ptr, fmt,
r3000_primary_table[op],
r3000_register_names[T],
IMM16S,
r3000_register_names[S]
);
} break;
default:
sprintf(ptr, "<invalid>");
break;
}
return buf;
}