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we can now disassemble riscv64-linux-musl-gcc hello world!

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Antoni Piasecki
2026-03-09 15:35:07 +01:00
parent cc868fa6ec
commit 20d8953220
2 changed files with 60 additions and 100 deletions
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2
.gitignore vendored
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@@ -3,3 +3,5 @@
/chip8 /chip8
/mos6502 /mos6502
/riscv64 /riscv64
/riscv64-linux-musl-cross
/dump

158
riscv64.cc
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@@ -86,6 +86,7 @@ enum Op {
C_SUB, C_SUB,
C_SUBW, C_SUBW,
C_SW, C_SW,
C_SWSP,
C_XOR, C_XOR,
DIV, DIV,
DIVU, DIVU,
@@ -187,106 +188,57 @@ struct OpDef {
Format format; Format format;
}; };
static constexpr std::array<OpDef, 100> OP_TABLE = {{ static constexpr std::array<OpDef, 101> OP_TABLE = {{
{"???", Format::NONE}, {"???", Format::NONE}, {"add", Format::R},
{"add", Format::R}, {"addi", Format::I}, {"addiw", Format::I},
{"addi", Format::I}, {"addw", Format::R}, {"amoswap.d", Format::R_ATOMIC},
{"addiw", Format::I}, {"and", Format::R}, {"andi", Format::I},
{"addw", Format::R}, {"auipc", Format::U}, {"beq", Format::B},
{"amoswap.d", Format::R_ATOMIC}, {"bge", Format::B}, {"bgeu", Format::B},
{"and", Format::R}, {"blt", Format::B}, {"bltu", Format::B},
{"andi", Format::I}, {"bne", Format::B}, {"c.add", Format::CR},
{"auipc", Format::U}, {"c.addi", Format::CI}, {"c.addiw", Format::CI},
{"beq", Format::B}, {"c.addi16sp", Format::CI}, {"c.addi4spn", Format::CI},
{"bge", Format::B}, {"c.addw", Format::CI}, {"c.and", Format::CR},
{"bgeu", Format::B}, {"c.andi", Format::CI}, {"c.beqz", Format::B},
{"blt", Format::B}, {"c.bnez", Format::B}, {"c.ebreak", Format::CR},
{"bltu", Format::B}, {"c.fldsp", Format::CSS}, {"c.j", Format::CJ},
{"bne", Format::B}, {"c.jalr", Format::CR1}, {"c.jr", Format::CR1},
{"c.add", Format::CR}, {"c.ld", Format::CL}, {"c.ldsp", Format::CL},
{"c.addi", Format::CI}, {"c.li", Format::CI}, {"c.lui", Format::CI},
{"c.addiw", Format::CI}, {"c.lw", Format::CL}, {"c.mv", Format::CR},
{"c.addi16sp", Format::CI}, {"c.or", Format::CR}, {"c.sd", Format::S},
{"c.addi4spn", Format::CI}, {"c.sdsp", Format::CSS}, {"c.slli", Format::CI},
{"c.addw", Format::CI}, {"c.srai", Format::CI}, {"c.srli", Format::CI},
{"c.and", Format::CR}, {"c.sub", Format::CR}, {"c.subw", Format::CR},
{"c.andi", Format::CI}, {"c.sw", Format::S}, {"c.swsp", Format::CSS},
{"c.beqz", Format::B}, {"c.xor", Format::CR}, {"div", Format::R},
{"c.bnez", Format::B}, {"divu", Format::R}, {"divuw", Format::R},
{"c.ebreak", Format::CR}, {"divw", Format::R}, {"ecall", Format::NONE},
{"c.fldsp", Format::CSS}, {"fence", Format::NONE}, {"fence.tso", Format::NONE},
{"c.j", Format::CJ}, {"jal", Format::J}, {"jalr", Format::I},
{"c.jalr", Format::CR1}, {"lb", Format::I_LOAD}, {"lbu", Format::I_LOAD},
{"c.jr", Format::CR1}, {"ld", Format::I_LOAD}, {"lh", Format::I_LOAD},
{"c.ld", Format::CL}, {"lhu", Format::I_LOAD}, {"lr.d", Format::R_ATOMIC_LR},
{"c.ldsp", Format::CL}, {"lui", Format::U}, {"lw", Format::I_LOAD},
{"c.li", Format::CI}, {"lwu", Format::I_LOAD}, {"mul", Format::R},
{"c.lui", Format::CI}, {"mulh", Format::R}, {"mulhu", Format::R},
{"c.lw", Format::CL}, {"mulw", Format::R}, {"or", Format::R},
{"c.mv", Format::CR}, {"ori", Format::I}, {"pause", Format::NONE},
{"c.or", Format::CR}, {"rem", Format::R}, {"remu", Format::R},
{"c.sd", Format::S}, {"remuw", Format::R}, {"remw", Format::R},
{"c.sdsp", Format::CSS}, {"sb", Format::S}, {"sc.d", Format::R_ATOMIC},
{"c.slli", Format::CI}, {"sd", Format::S}, {"sh", Format::S},
{"c.srai", Format::CI}, {"sll", Format::R}, {"slli", Format::I_SHIFT},
{"c.srli", Format::CI}, {"slliw", Format::I_SHIFT}, {"sllw", Format::R},
{"c.sub", Format::CR}, {"slt", Format::R}, {"slti", Format::I},
{"c.subw", Format::CR}, {"sltiu", Format::I}, {"sltu", Format::R},
{"c.sw", Format::S}, {"sra", Format::R}, {"srai", Format::I_SHIFT},
{"c.xor", Format::CR}, {"sraiw", Format::I_SHIFT}, {"sraw", Format::R},
{"div", Format::R}, {"srl", Format::R}, {"srli", Format::I_SHIFT},
{"divu", Format::R}, {"srliw", Format::I_SHIFT}, {"srlw", Format::R},
{"divuw", Format::R}, {"sub", Format::R}, {"subw", Format::R},
{"divw", Format::R}, {"sw", Format::S}, {"xor", Format::R},
{"ecall", Format::NONE},
{"fence", Format::NONE},
{"fence.tso", Format::NONE},
{"jal", Format::J},
{"jalr", Format::I},
{"lb", Format::I_LOAD},
{"lbu", Format::I_LOAD},
{"ld", Format::I_LOAD},
{"lh", Format::I_LOAD},
{"lhu", Format::I_LOAD},
{"lr.d", Format::R_ATOMIC_LR},
{"lui", Format::U},
{"lw", Format::I_LOAD},
{"lwu", Format::I_LOAD},
{"mul", Format::R},
{"mulh", Format::R},
{"mulhu", Format::R},
{"mulw", Format::R},
{"or", Format::R},
{"ori", Format::I},
{"pause", Format::NONE},
{"rem", Format::R},
{"remu", Format::R},
{"remuw", Format::R},
{"remw", Format::R},
{"sb", Format::S},
{"sc.d", Format::R_ATOMIC},
{"sd", Format::S},
{"sh", Format::S},
{"sll", Format::R},
{"slli", Format::I_SHIFT},
{"slliw", Format::I_SHIFT},
{"sllw", Format::R},
{"slt", Format::R},
{"slti", Format::I},
{"sltiu", Format::I},
{"sltu", Format::R},
{"sra", Format::R},
{"srai", Format::I_SHIFT},
{"sraiw", Format::I_SHIFT},
{"sraw", Format::R},
{"srl", Format::R},
{"srli", Format::I_SHIFT},
{"srliw", Format::I_SHIFT},
{"srlw", Format::R},
{"sub", Format::R},
{"subw", Format::R},
{"sw", Format::S},
{"xor", Format::R},
{"xori", Format::I}, {"xori", Format::I},
}}; }};
@@ -1091,6 +1043,12 @@ private:
} }
} }
}; break; }; break;
case 0b110: {
i.rs2 = (raw >> 2) & 0b11111;
i.rs1 = 2;
i.imm = (((raw >> 9) & 0b1111) << 2) | (((raw >> 7) & 0b11) << 6);
i.op = Op::C_SWSP;
}; break;
case 0b111: { case 0b111: {
i.rs2 = (raw >> 2) & 0b11111; i.rs2 = (raw >> 2) & 0b11111;
i.imm = (((raw >> 10) & 0b111) << 3) | (((raw >> 7) & 0b111) << 6); i.imm = (((raw >> 10) & 0b111) << 3) | (((raw >> 7) & 0b111) << 6);