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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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9
cranelift/codegen/src/isa/aarch64/inst/emit.rs
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@@ -1334,6 +1334,15 @@ impl MachInstEmit for Inst {
}
}
}
&Inst::MovPReg { rd, rm } => {
let rd = allocs.next_writable(rd);
let rm: Reg = rm.into();
debug_assert!([regs::fp_reg(), regs::stack_reg(), regs::link_reg()].contains(&rm));
assert!(rm.class() == RegClass::Int);
assert!(rd.to_reg().class() == rm.class());
let size = OperandSize::Size64;
Inst::Mov { size, rd, rm }.emit(&[], sink, emit_info, state);
}
&Inst::MovWide { op, rd, imm, size } => {
let rd = allocs.next_writable(rd);
sink.put4(enc_move_wide(op, rd, imm, size));