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Cranelift: Add instructions for getting the current stack/frame/return pointers (#4573)

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* Cranelift: Add instructions for getting the current stack/frame pointers and return address

This is the initial part of https://github.com/bytecodealliance/wasmtime/issues/4535

* x64: Remove `Amode::RbpOffset` and use `Amode::ImmReg` instead

We just special case getting operands from `Amode`s now.

* Fix s390x `get_return_address`; require `preserve_frame_pointers=true`

* Assert that `Amode::ImmRegRegShift` doesn't use rbp/rsp

* Handle non-allocatable registers in Amode::with_allocs

* Use "stack" instead of "r15" on s390x

* r14 is an allocatable register on s390x, so it shouldn't be used with `MovPReg`
This commit is contained in:
Nick Fitzgerald
2022-08-02 14:37:17 -07:00
committed by GitHub
parent 6b4e6523f7
commit 42bba452a6
28 changed files with 484 additions and 24 deletions
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10
cranelift/codegen/src/isa/x64/inst/emit.rs
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@@ -678,6 +678,16 @@ pub(crate) fn emit(
);
}
Inst::MovPReg { src, dst } => {
let src: Reg = (*src).into();
debug_assert!([regs::rsp(), regs::rbp()].contains(&src));
let src = Gpr::new(src).unwrap();
let size = OperandSize::Size64;
let dst = allocs.next(dst.to_reg().to_reg());
let dst = WritableGpr::from_writable_reg(Writable::from_reg(dst)).unwrap();
Inst::MovRR { size, src, dst }.emit(&[], sink, info, state);
}
Inst::MovzxRmR { ext_mode, src, dst } => {
let dst = allocs.next(dst.to_reg().to_reg());
let (opcodes, num_opcodes, mut rex_flags) = match ext_mode {