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Add emitter for LOCK CMPXCHG so that we can emit compare-and-swap loops.

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This commit is contained in:
Nick Lewycky 2019-09-18 11:58:21 -07:00
parent efc89e829d
commit 81895830f0
1 changed files with 19 additions and 0 deletions
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19
lib/singlepass-backend/src/emitter_x64.rs
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@ -97,6 +97,7 @@ pub trait Emitter {
fn emit_movsx(&mut self, sz_src: Size, src: Location, sz_dst: Size, dst: Location);
fn emit_xchg(&mut self, sz: Size, src: Location, dst: Location);
fn emit_lock_xadd(&mut self, sz: Size, src: Location, dst: Location);
fn emit_lock_cmpxchg(&mut self, sz: Size, src: Location, dst: Location);
fn emit_btc_gpr_imm8_32(&mut self, src: u8, dst: GPR);
fn emit_btc_gpr_imm8_64(&mut self, src: u8, dst: GPR);
@ -858,6 +859,24 @@ impl Emitter for Assembler {
}
}
fn emit_lock_cmpxchg(&mut self, sz: Size, src: Location, dst: Location) {
match (sz, src, dst) {
(Size::S8, Location::GPR(src), Location::Memory(dst, disp)) => {
dynasm!(self ; lock cmpxchg [Rq(dst as u8) + disp], Rb(src as u8));
}
(Size::S16, Location::GPR(src), Location::Memory(dst, disp)) => {
dynasm!(self ; lock cmpxchg [Rq(dst as u8) + disp], Rw(src as u8));
}
(Size::S32, Location::GPR(src), Location::Memory(dst, disp)) => {
dynasm!(self ; lock cmpxchg [Rq(dst as u8) + disp], Rd(src as u8));
}
(Size::S64, Location::GPR(src), Location::Memory(dst, disp)) => {
dynasm!(self ; lock cmpxchg [Rq(dst as u8) + disp], Rq(src as u8));
}
_ => panic!("LOCK CMPXCHG {:?} {:?} {:?}", sz, src, dst),
}
}
fn emit_btc_gpr_imm8_32(&mut self, src: u8, dst: GPR) {
dynasm!(self ; btc Rd(dst as u8), BYTE src as i8);
}