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intel isa: comments to explain rip-relative addressing encoding

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This commit is contained in:
Pat Hickey
2017-12-12 15:13:11 -08:00
committed by Jakob Stoklund Olesen
parent ed81bc21be
commit d444044e9e
2 changed files with 10 additions and 3 deletions
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7
lib/cretonne/src/isa/intel/binemit.rs
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@@ -180,6 +180,13 @@ fn modrm_rm<CS: CodeSink + ?Sized>(rm: RegUnit, reg: RegUnit, sink: &mut CS) {
sink.put1(b);
}
/// Emit a mode 00 Mod/RM byte, with a rip-relative displacement in 64-bit mode. Effective address
/// is calculated by adding displacement to 64-bit rip of next instruction. See intel Sw dev manual
/// section 2.2.1.6.
fn modrm_riprel<CS: CodeSink + ?Sized>(reg: RegUnit, sink: &mut CS) {
modrm_rm(0b101, reg, sink)
}
/// Emit a mode 01 ModR/M byte. This is a register-indirect addressing mode with 8-bit
/// displacement.
/// Register %rsp is invalid for `rm`. It indicates the presence of a SIB byte.