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https://github.com/RGBCube/serenity
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LibJS/JIT: Add Assembler::add() and sub() helpers
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parent
10dcb4d53a
commit
e7ce3d271a
1 changed files with 48 additions and 8 deletions
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@ -334,6 +334,52 @@ struct Assembler {
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}
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}
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void add(Operand dst, Operand src)
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{
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if (dst.type == Operand::Type::Reg && src.type == Operand::Type::Reg) {
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emit8(0x48
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| ((to_underlying(dst.reg) >= 8) ? 1 << 2 : 0)
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| ((to_underlying(src.reg) >= 8) ? 1 << 0 : 0));
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emit8(0x01);
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emit8(0xc0 | (encode_reg(dst.reg) << 3) | encode_reg(src.reg));
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} else if (dst.type == Operand::Type::Reg && src.type == Operand::Type::Imm32) {
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emit8(0x48 | ((to_underlying(dst.reg) >= 8) ? 1 << 0 : 0));
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emit8(0x81);
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emit8(0xc0 | encode_reg(dst.reg));
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emit32(src.offset_or_immediate);
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} else if (dst.type == Operand::Type::Reg && src.type == Operand::Type::Imm8) {
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emit8(0x48 | ((to_underlying(dst.reg) >= 8) ? 1 << 0 : 0));
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emit8(0x83);
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emit8(0xc0 | encode_reg(dst.reg));
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emit8(src.offset_or_immediate);
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} else {
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VERIFY_NOT_REACHED();
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}
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}
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void sub(Operand dst, Operand src)
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{
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if (dst.type == Operand::Type::Reg && src.type == Operand::Type::Reg) {
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emit8(0x48
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| ((to_underlying(dst.reg) >= 8) ? 1 << 2 : 0)
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| ((to_underlying(src.reg) >= 8) ? 1 << 0 : 0));
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emit8(0x29);
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emit8(0xc0 | (encode_reg(dst.reg) << 3) | encode_reg(src.reg));
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} else if (dst.type == Operand::Type::Reg && src.type == Operand::Type::Imm32) {
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emit8(0x48 | ((to_underlying(dst.reg) >= 8) ? 1 << 0 : 0));
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emit8(0x81);
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emit8(0xe8 | encode_reg(dst.reg));
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emit32(src.offset_or_immediate);
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} else if (dst.type == Operand::Type::Reg && src.type == Operand::Type::Imm8) {
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emit8(0x48 | ((to_underlying(dst.reg) >= 8) ? 1 << 0 : 0));
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emit8(0x83);
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emit8(0xe8 | encode_reg(dst.reg));
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emit8(src.offset_or_immediate);
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} else {
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VERIFY_NOT_REACHED();
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}
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}
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void native_call(void* callee)
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{
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// push caller-saved registers on the stack
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@ -348,10 +394,7 @@ struct Assembler {
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push(Operand::Register(Reg::R11));
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// align the stack to 16-byte boundary
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emit8(0x48);
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emit8(0x83);
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emit8(0xec);
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emit8(0x08);
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sub(Operand::Register(Reg::RSP), Operand::Imm8(8));
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// load callee into RAX and make indirect call
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emit8(0x48);
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@ -361,10 +404,7 @@ struct Assembler {
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emit8(0xd0);
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// adjust stack pointer
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emit8(0x48);
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emit8(0x83);
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emit8(0xc4);
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emit8(0x08);
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add(Operand::Register(Reg::RSP), Operand::Imm8(8));
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// restore caller-saved registers from the stack
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pop(Operand::Register(Reg::R11));
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