mirror of https://github.com/rust-lang/rust
85 lines
2.0 KiB
Rust
85 lines
2.0 KiB
Rust
//@ only-aarch64
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//@ only-linux
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//@ needs-asm-support
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//@ run-pass
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#![feature(thread_local)]
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use std::arch::asm;
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extern "C" fn f1() -> i32 {
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111
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}
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// The compiler will generate a shim to hide the caller location parameter.
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#[track_caller]
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fn f2() -> i32 {
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222
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}
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macro_rules! call {
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($func:path) => {
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unsafe {
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let result: i32;
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asm!("bl {}", sym $func,
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out("w0") result,
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out("x20") _, out("x21") _, out("x22") _,
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out("x23") _, out("x24") _, out("x25") _,
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out("x26") _, out("x27") _, out("x28") _,
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);
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result
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}
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}
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}
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macro_rules! static_addr {
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($s:expr) => {
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unsafe {
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let result: *const u32;
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asm!(
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// ADRP gives the address of a 4KB page from a PC-relative address
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"adrp {out}, {sym}",
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// We then add the remaining lower 12 bits
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"add {out}, {out}, #:lo12:{sym}",
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out = out(reg) result,
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sym = sym $s);
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result
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}
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}
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}
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macro_rules! static_tls_addr {
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($s:expr) => {
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unsafe {
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let result: *const u32;
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asm!(
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// Load the thread pointer register
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"mrs {out}, TPIDR_EL0",
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// Add the top 12 bits of the symbol's offset
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"add {out}, {out}, :tprel_hi12:{sym}",
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// And the bottom 12 bits
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"add {out}, {out}, :tprel_lo12_nc:{sym}",
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out = out(reg) result,
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sym = sym $s
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);
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result
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}
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}
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}
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static S1: u32 = 111;
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#[thread_local]
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static S2: u32 = 222;
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fn main() {
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assert_eq!(call!(f1), 111);
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assert_eq!(call!(f2), 222);
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assert_eq!(static_addr!(S1), &S1 as *const u32);
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assert_eq!(static_tls_addr!(S2), &S2 as *const u32);
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std::thread::spawn(|| {
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assert_eq!(static_addr!(S1), &S1 as *const u32);
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assert_eq!(static_tls_addr!(S2), &S2 as *const u32);
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})
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.join()
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.unwrap();
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}
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