pie-relocation-model.rs

//@ add-core-stubs
//@ revisions: x64
//@ assembly-output: emit-asm
//@ [x64] compile-flags: --target x86_64-unknown-linux-gnu -Crelocation-model=pie
//@ [x64] needs-llvm-components: x86

#![feature(no_core, lang_items)]
#![no_core]
#![crate_type = "rlib"]

extern crate minicore;
use minicore::*;

// CHECK-LABEL: call_other_fn:
// With PIE local functions are called "directly".
// CHECK:       {{(jmp|callq)}} other_fn
#[no_mangle]
pub fn call_other_fn() -> u8 {
    unsafe { other_fn() }
}

// CHECK-LABEL: other_fn:
// External functions are still called through GOT, since we don't know if the symbol
// is defined in the binary or in the shared library.
// CHECK:       callq *foreign_fn@GOTPCREL(%rip)
#[no_mangle]
#[inline(never)]
pub fn other_fn() -> u8 {
    unsafe { foreign_fn() }
}

extern "C" {
    fn foreign_fn() -> u8;
}