mirror of
https://github.com/RetroDECK/Duckstation.git
synced 2024-10-23 15:45:42 +00:00
370 lines
11 KiB
C++
370 lines
11 KiB
C++
#include "cpu_disasm.h"
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#include "cpu_core.h"
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#include <array>
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namespace CPU {
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enum Operand : u8
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{
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Operand_None,
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i_rs,
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i_rt,
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i_imm,
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j_target,
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r_rs,
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r_rt,
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r_rd,
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r_shamt,
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r_funct
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};
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struct TableEntry
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{
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const char* format;
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};
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static const std::array<const char*, 64> s_base_table = {{
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"", // 0
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"UNKNOWN", // 1
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"j $jt", // 2
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"jal $jt", // 3
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"beq $rs, $rt, $rel", // 4
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"bne $rs, $rt, $rel", // 5
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"blez $rs, $rel", // 6
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"bgtz $rs, $rel", // 7
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"addi $rt, $rs, $imm", // 8
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"addiu $rt, $rs, $imm", // 9
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"slti $rt, $rs, $imm", // 10
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"sltiu $rt, $rs, $immu", // 11
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"andi $rt, $rs, $immu", // 12
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"ori $rt, $rs, $immu", // 13
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"xori $rt, $rs, $immu", // 14
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"lui $rt, $imm", // 15
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"UNKNOWN", // 16
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"UNKNOWN", // 17
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"UNKNOWN", // 18
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"UNKNOWN", // 19
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"UNKNOWN", // 20
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"UNKNOWN", // 21
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"UNKNOWN", // 22
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"UNKNOWN", // 23
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"UNKNOWN", // 24
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"UNKNOWN", // 25
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"UNKNOWN", // 26
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"UNKNOWN", // 27
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"UNKNOWN", // 28
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"UNKNOWN", // 29
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"UNKNOWN", // 30
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"UNKNOWN", // 31
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"lb $rt, $offsetrs", // 32
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"lh $rt, $offsetrs", // 33
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"lwl $rt, $offsetrs", // 34
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"lw $rt, $offsetrs", // 35
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"lbu $rt, $offsetrs", // 36
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"lhu $rt, $offsetrs", // 37
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"lwr $rt, $offsetrs", // 38
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"UNKNOWN", // 39
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"sb $rt, $offsetrs", // 40
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"sh $rt, $offsetrs", // 41
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"swl $rt, $offsetrs", // 42
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"sw $rt, $offsetrs", // 43
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"UNKNOWN", // 44
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"UNKNOWN", // 45
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"swr $rt, $offsetrs", // 46
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"UNKNOWN", // 47
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"lwc0 $coprt, $offsetrs", // 48
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"lwc1 $coprt, $offsetrs", // 49
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"lwc2 $coprt, $offsetrs", // 50
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"lwc3 $coprt, $offsetrs", // 51
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"UNKNOWN", // 52
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"UNKNOWN", // 53
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"UNKNOWN", // 54
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"UNKNOWN", // 55
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"swc0 $coprt, $offsetrs", // 56
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"swc1 $coprt, $offsetrs", // 57
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"swc2 $coprt, $offsetrs", // 58
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"swc3 $coprt, $offsetrs", // 59
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"UNKNOWN", // 60
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"UNKNOWN", // 61
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"UNKNOWN", // 62
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"UNKNOWN" // 63
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}};
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static const std::array<const char*, 64> s_special_table = {{
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"sll $rd, $rt, $shamt", // 0
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"UNKNOWN", // 1
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"srl $rd, $rt, $shamt", // 2
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"sra $rd, $rt, $shamt", // 3
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"sllv $rd, $rt, $rs", // 4
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"UNKNOWN", // 5
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"srlv $rd, $rt, $rs", // 6
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"srav $rd, $rt, $rs", // 7
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"jr $rs", // 8
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"jalr $rd, $rs", // 9
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"UNKNOWN", // 10
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"UNKNOWN", // 11
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"syscall", // 12
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"break", // 13
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"UNKNOWN", // 14
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"UNKNOWN", // 15
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"mfhi $rd", // 16
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"mthi $rs", // 17
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"mflo $rd", // 18
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"mtlo $rs", // 19
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"UNKNOWN", // 20
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"UNKNOWN", // 21
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"UNKNOWN", // 22
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"UNKNOWN", // 23
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"mult $rs, $rt", // 24
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"multu $rs, $rt", // 25
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"div $rs, $rt", // 26
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"divu $rs, $rt", // 27
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"UNKNOWN", // 28
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"UNKNOWN", // 29
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"UNKNOWN", // 30
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"UNKNOWN", // 31
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"add $rd, $rs, $rt", // 32
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"addu $rd, $rs, $rt", // 33
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"sub $rd, $rs, $rt", // 34
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"subu $rd, $rs, $rt", // 35
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"and $rd, $rs, $rt", // 36
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"or $rd, $rs, $rt", // 37
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"xor $rd, $rs, $rt", // 38
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"nor $rd, $rs, $rt", // 39
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"UNKNOWN", // 40
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"UNKNOWN", // 41
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"slt $rd, $rs, $rt", // 42
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"sltu $rd, $rs, $rt", // 43
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"UNKNOWN", // 44
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"UNKNOWN", // 45
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"UNKNOWN", // 46
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"UNKNOWN", // 47
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"UNKNOWN", // 48
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"UNKNOWN", // 49
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"UNKNOWN", // 50
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"UNKNOWN", // 51
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"UNKNOWN", // 52
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"UNKNOWN", // 53
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"UNKNOWN", // 54
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"UNKNOWN", // 55
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"UNKNOWN", // 56
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"UNKNOWN", // 57
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"UNKNOWN", // 58
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"UNKNOWN", // 59
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"UNKNOWN", // 60
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"UNKNOWN", // 61
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"UNKNOWN", // 62
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"UNKNOWN" // 63
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}};
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static const std::array<std::pair<CopCommonInstruction, const char*>, 5> s_cop_common_table = {
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{{CopCommonInstruction::mfcn, "mfc$cop $rt, $coprd"},
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{CopCommonInstruction::cfcn, "cfc$cop $rt, $coprd"},
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{CopCommonInstruction::mtcn, "mtc$cop $rt, $coprd"},
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{CopCommonInstruction::ctcn, "ctc$cop $rt, $coprd"},
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{CopCommonInstruction::bcnc, "bc$cop$copcc $rel"}}};
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static const std::array<std::pair<Cop0Instruction, const char*>, 1> s_cop0_table = {{{Cop0Instruction::rfe, "rfe"}}};
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static void FormatInstruction(String* dest, const Instruction inst, u32 pc, Core* state, const char* format)
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{
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dest->Clear();
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TinyString comment;
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const char* str = format;
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while (*str != '\0')
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{
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const char ch = *(str++);
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if (ch != '$')
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{
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dest->AppendCharacter(ch);
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continue;
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}
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if (std::strncmp(str, "rs", 2) == 0)
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{
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dest->AppendString(GetRegName(inst.r.rs));
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if (state)
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{
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comment.AppendFormattedString("%s%s=0x%08X", comment.IsEmpty() ? "" : ", ", GetRegName(inst.r.rs),
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state->GetRegs().r[static_cast<u8>(inst.r.rs.GetValue())]);
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}
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str += 2;
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}
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else if (std::strncmp(str, "rt", 2) == 0)
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{
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dest->AppendString(GetRegName(inst.r.rt));
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if (state)
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{
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comment.AppendFormattedString("%s%s=0x%08X", comment.IsEmpty() ? "" : ", ", GetRegName(inst.r.rt),
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state->GetRegs().r[static_cast<u8>(inst.r.rt.GetValue())]);
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}
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str += 2;
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}
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else if (std::strncmp(str, "rd", 2) == 0)
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{
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dest->AppendString(GetRegName(inst.r.rd));
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if (state)
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{
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comment.AppendFormattedString("%s%s=0x%08X", comment.IsEmpty() ? "" : ", ", GetRegName(inst.r.rd),
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state->GetRegs().r[static_cast<u8>(inst.r.rd.GetValue())]);
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}
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str += 2;
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}
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else if (std::strncmp(str, "shamt", 5) == 0)
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{
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dest->AppendFormattedString("%d", ZeroExtend32(inst.r.shamt.GetValue()));
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str += 5;
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}
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else if (std::strncmp(str, "immu", 4) == 0)
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{
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dest->AppendFormattedString("%u", inst.i.imm_zext32());
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str += 4;
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}
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else if (std::strncmp(str, "imm", 3) == 0)
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{
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// dest->AppendFormattedString("%d", static_cast<int>(inst.i.imm_sext32()));
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dest->AppendFormattedString("%04x", inst.i.imm_zext32());
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str += 3;
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}
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else if (std::strncmp(str, "rel", 3) == 0)
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{
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const u32 target = (pc + UINT32_C(4)) + (inst.i.imm_sext32() << 2);
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dest->AppendFormattedString("%08x", target);
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str += 3;
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}
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else if (std::strncmp(str, "offsetrs", 8) == 0)
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{
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const s32 offset = static_cast<s32>(inst.i.imm_sext32());
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dest->AppendFormattedString("%d(%s)", offset, GetRegName(inst.i.rs));
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if (state)
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{
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comment.AppendFormattedString("%saddr=0x%08X", comment.IsEmpty() ? "" : ", ",
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state->GetRegs().r[static_cast<u8>(inst.i.rs.GetValue())] + offset);
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}
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str += 8;
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}
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else if (std::strncmp(str, "jt", 2) == 0)
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{
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const u32 target = ((pc + UINT32_C(4)) & UINT32_C(0xF0000000)) | (inst.j.target << 2);
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dest->AppendFormattedString("%08x", target);
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str += 2;
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}
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else if (std::strncmp(str, "copcc", 5) == 0)
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{
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dest->AppendCharacter(((inst.bits & (UINT32_C(1) << 24)) != 0) ? 't' : 'f');
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str += 5;
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}
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else if (std::strncmp(str, "coprd", 5) == 0)
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{
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dest->AppendFormattedString("%u", ZeroExtend32(static_cast<u8>(inst.r.rd.GetValue())));
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str += 5;
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}
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else if (std::strncmp(str, "coprt", 5) == 0)
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{
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dest->AppendFormattedString("%u", ZeroExtend32(static_cast<u8>(inst.r.rt.GetValue())));
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str += 5;
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}
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else if (std::strncmp(str, "cop", 3) == 0)
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{
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dest->AppendFormattedString("%u", static_cast<u8>(inst.op.GetValue()) & INSTRUCTION_COP_N_MASK);
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str += 3;
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}
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else
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{
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Panic("Unknown operand");
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}
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}
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if (!comment.IsEmpty())
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{
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for (u32 i = dest->GetLength(); i < 30; i++)
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dest->AppendCharacter(' ');
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dest->AppendString("; ");
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dest->AppendString(comment);
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}
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}
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template<typename T>
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void FormatCopInstruction(String* dest, u32 pc, Core* state, const Instruction inst,
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const std::pair<T, const char*>* table, size_t table_size, T table_key)
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{
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for (size_t i = 0; i < table_size; i++)
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{
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if (table[i].first == table_key)
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{
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FormatInstruction(dest, inst, pc, state, table[i].second);
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return;
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}
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}
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dest->Format("<cop%u 0x%08X>", ZeroExtend32(inst.cop.cop_n.GetValue()), inst.cop.imm25.GetValue());
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}
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void DisassembleInstruction(String* dest, u32 pc, u32 bits, Core* state)
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{
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const Instruction inst{bits};
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switch (inst.op)
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{
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case InstructionOp::funct:
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FormatInstruction(dest, inst, pc, state, s_special_table[static_cast<u8>(inst.r.funct.GetValue())]);
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return;
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case InstructionOp::cop0:
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case InstructionOp::cop1:
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case InstructionOp::cop2:
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case InstructionOp::cop3:
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{
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if (inst.cop.IsCommonInstruction())
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{
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FormatCopInstruction(dest, pc, state, inst, s_cop_common_table.data(), s_cop_common_table.size(),
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inst.cop.CommonOp());
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}
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else
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{
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switch (inst.op)
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{
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case InstructionOp::cop0:
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{
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FormatCopInstruction(dest, pc, state, inst, s_cop0_table.data(), s_cop0_table.size(), inst.cop.Cop0Op());
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}
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break;
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case InstructionOp::cop1:
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case InstructionOp::cop2:
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case InstructionOp::cop3:
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default:
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{
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dest->Format("<cop%u 0x%08X>", ZeroExtend32(inst.cop.cop_n.GetValue()), inst.cop.imm25.GetValue());
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}
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break;
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}
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}
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}
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break;
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// special case for bltz/bgez{al}
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case InstructionOp::b:
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{
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const u8 rt = static_cast<u8>(inst.i.rt.GetValue());
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const bool bgez = ConvertToBoolUnchecked(rt & u8(1));
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const bool link = ConvertToBoolUnchecked((rt >> 4) & u8(1));
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if (link)
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FormatInstruction(dest, inst, pc, state, bgez ? "bgezal $rs, $rel" : "bltzal $rs, $rel");
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else
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FormatInstruction(dest, inst, pc, state, bgez ? "bgez $rs, $rel" : "bltz $rs, $rel");
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}
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break;
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default:
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FormatInstruction(dest, inst, pc, state, s_base_table[static_cast<u8>(inst.op.GetValue())]);
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break;
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}
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}
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} // namespace CPU
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