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Eddy (Eduard) Stefes
f39fa9e4c0
this enables packed-stack just as -mpacked-stack in clang and gcc. packed-stack is needed on s390x for kernel development. Co-authored-by: Ralf Jung <post@ralfj.de>
38 lines
1.1 KiB
Rust
38 lines
1.1 KiB
Rust
//@ add-minicore
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//@ revisions: enable-packedstack default-packedstack
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//@ assembly-output: emit-asm
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//@ compile-flags: -Copt-level=3 --crate-type=lib --target=s390x-unknown-linux-gnu -Cforce-unwind-tables=no
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//@ needs-llvm-components: systemz
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//@[enable-packedstack] compile-flags: -Zpacked-stack
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#![feature(no_core, lang_items)]
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#![no_std]
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#![no_core]
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extern crate minicore;
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use minicore::*;
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extern "C" {
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fn extern_func() -> i32;
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}
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// CHECK-LABEL: test_packedstack
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#[no_mangle]
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extern "C" fn test_packedstack() -> i32 {
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// test the creation of call stack with and without packed-stack
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// without packed-stack we always reserve a least the maximal space of 160 bytes
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// default-packedstack: stmg %r14, %r15, 112(%r15)
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// default-packedstack-NEXT: aghi %r15, -160
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// default-packedstack-NEXT: brasl %r14, extern_func
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// with packed-stack only the actually needed registers are reserved on the stack
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// enable-packedstack: stmg %r14, %r15, 144(%r15)
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// enable-packedstack-NEXT: aghi %r15, -16
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// enable-packedstack-NEXT: brasl %r14, extern_func
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unsafe {
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extern_func();
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}
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1
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// CHECK: br %r{{.*}}
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}
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