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Custom implementation for 'mov r/m, imm'

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This commit is contained in:
Fabian 2018-08-21 21:38:11 -05:00
parent 415e345e54
commit 9164e0a48f
2 changed files with 21 additions and 1 deletions
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2
gen/x86_table.js
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@ -182,7 +182,7 @@ const encodings = [
{ opcode: 0xC4, block_boundary: 1, os: 1, e: 1, skip: 1, }, // les
{ opcode: 0xC5, block_boundary: 1, os: 1, e: 1, skip: 1, }, // lds
{ opcode: 0xC6, e: 1, fixed_g: 0, imm8: 1 },
{ opcode: 0xC6, custom: 1, e: 1, fixed_g: 0, imm8: 1 },
{ opcode: 0xC7, custom: 1, os: 1, e: 1, fixed_g: 0, imm1632: 1 },
// XXX: Temporary block boundary

20
src/rust/jit_instructions.rs
View file

@ -595,6 +595,26 @@ pub fn instr32_0FBE_mem_jit(ctx: &mut JitContext, modrm_byte: u8, r: u32) {
ctx.builder.instruction_body.store_aligned_i32(0);
}
pub fn instr_C6_0_reg_jit(ctx: &mut JitContext, r: u32, imm: u32) {
// reg8[r] = imm;
ctx.builder
.instruction_body
.const_i32(global_pointers::get_reg8_offset(r) as i32);
ctx.builder.instruction_body.const_i32(imm as i32);
ctx.builder.instruction_body.store_u8(0);
}
pub fn instr_C6_0_mem_jit(ctx: &mut JitContext, modrm_byte: u8) {
codegen::gen_modrm_resolve(ctx, modrm_byte);
let address_local = ctx.builder.set_new_local();
let imm = ctx.cpu.read_imm8();
ctx.builder.instruction_body.const_i32(imm as i32);
let value_local = ctx.builder.set_new_local();
codegen::gen_safe_write8(ctx, &address_local, &value_local);
ctx.builder.free_local(address_local);
ctx.builder.free_local(value_local);
}
pub fn instr16_C7_0_reg_jit(ctx: &mut JitContext, r: u32, imm: u32) {
// reg16[r] = imm;
ctx.builder