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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:13 +0000 |
commit | 218caa410aa38c29984be31a5229b9fa717560ee (patch) | |
tree | c54bd55eeb6e4c508940a30e94c0032fbd45d677 /tests/assembly/x86_64-naked-fn-no-cet-prolog.rs | |
parent | Releasing progress-linux version 1.67.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-218caa410aa38c29984be31a5229b9fa717560ee.tar.xz rustc-218caa410aa38c29984be31a5229b9fa717560ee.zip |
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/assembly/x86_64-naked-fn-no-cet-prolog.rs')
-rw-r--r-- | tests/assembly/x86_64-naked-fn-no-cet-prolog.rs | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/tests/assembly/x86_64-naked-fn-no-cet-prolog.rs b/tests/assembly/x86_64-naked-fn-no-cet-prolog.rs new file mode 100644 index 000000000..bedcded73 --- /dev/null +++ b/tests/assembly/x86_64-naked-fn-no-cet-prolog.rs @@ -0,0 +1,24 @@ +// compile-flags: -C no-prepopulate-passes -Zcf-protection=full +// assembly-output: emit-asm +// needs-asm-support +// only-x86_64 + +#![crate_type = "lib"] +#![feature(naked_functions)] +use std::arch::asm; + +// The problem at hand: Rust has adopted a fairly strict meaning for "naked functions", +// meaning "no prologue whatsoever, no, really, not one instruction." +// Unfortunately, x86's control-flow enforcement, specifically indirect branch protection, +// works by using an instruction for each possible landing site, +// and LLVM implements this via making sure of that. +#[no_mangle] +#[naked] +pub unsafe extern "sysv64" fn will_halt() -> ! { + // CHECK-NOT: endbr{{32|64}} + // CHECK: hlt + asm!("hlt", options(noreturn)) +} + +// what about aarch64? +// "branch-protection"=false |