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Use weak linkage for aeabi memory functions #385

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Oct 14, 2020
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Use weak linkage for aeabi memory functions #385

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26 changes: 14 additions & 12 deletions src/arm.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -138,18 +138,20 @@ pub unsafe fn __aeabi_ldivmod() {
intrinsics::unreachable();
}

// The following functions use weak linkage to allow users to override
// with custom implementation.
// FIXME: The `*4` and `*8` variants should be defined as aliases.

#[cfg(not(target_os = "ios"))]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
#[cfg_attr(thumb, linkage = "weak")]
#[linkage = "weak"]
pub unsafe extern "aapcs" fn __aeabi_memcpy(dest: *mut u8, src: *const u8, n: usize) {
::mem::memcpy(dest, src, n);
}

#[cfg(not(target_os = "ios"))]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
#[cfg_attr(thumb, linkage = "weak")]
#[linkage = "weak"]
pub unsafe extern "aapcs" fn __aeabi_memcpy4(dest: *mut u8, src: *const u8, mut n: usize) {
// We are guaranteed 4-alignment, so accessing at u32 is okay.
let mut dest = dest as *mut u32;
Expand All @@ -167,43 +169,43 @@ pub unsafe extern "aapcs" fn __aeabi_memcpy4(dest: *mut u8, src: *const u8, mut

#[cfg(not(target_os = "ios"))]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
#[cfg_attr(thumb, linkage = "weak")]
#[linkage = "weak"]
pub unsafe extern "aapcs" fn __aeabi_memcpy8(dest: *mut u8, src: *const u8, n: usize) {
__aeabi_memcpy4(dest, src, n);
}

#[cfg(not(target_os = "ios"))]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
#[cfg_attr(thumb, linkage = "weak")]
#[linkage = "weak"]
pub unsafe extern "aapcs" fn __aeabi_memmove(dest: *mut u8, src: *const u8, n: usize) {
::mem::memmove(dest, src, n);
}

#[cfg(not(any(target_os = "ios", target_env = "msvc")))]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
#[cfg_attr(thumb, linkage = "weak")]
#[linkage = "weak"]
pub unsafe extern "aapcs" fn __aeabi_memmove4(dest: *mut u8, src: *const u8, n: usize) {
__aeabi_memmove(dest, src, n);
}

#[cfg(not(any(target_os = "ios", target_env = "msvc")))]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
#[cfg_attr(thumb, linkage = "weak")]
#[linkage = "weak"]
pub unsafe extern "aapcs" fn __aeabi_memmove8(dest: *mut u8, src: *const u8, n: usize) {
__aeabi_memmove(dest, src, n);
}

#[cfg(not(target_os = "ios"))]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
#[cfg_attr(thumb, linkage = "weak")]
#[linkage = "weak"]
pub unsafe extern "aapcs" fn __aeabi_memset(dest: *mut u8, n: usize, c: i32) {
// Note the different argument order
::mem::memset(dest, c, n);
}

#[cfg(not(target_os = "ios"))]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
#[cfg_attr(thumb, linkage = "weak")]
#[linkage = "weak"]
pub unsafe extern "aapcs" fn __aeabi_memset4(dest: *mut u8, mut n: usize, c: i32) {
let mut dest = dest as *mut u32;

Expand All @@ -221,28 +223,28 @@ pub unsafe extern "aapcs" fn __aeabi_memset4(dest: *mut u8, mut n: usize, c: i32

#[cfg(not(target_os = "ios"))]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
#[cfg_attr(thumb, linkage = "weak")]
#[linkage = "weak"]
pub unsafe extern "aapcs" fn __aeabi_memset8(dest: *mut u8, n: usize, c: i32) {
__aeabi_memset4(dest, n, c);
}

#[cfg(not(target_os = "ios"))]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
#[cfg_attr(thumb, linkage = "weak")]
#[linkage = "weak"]
pub unsafe extern "aapcs" fn __aeabi_memclr(dest: *mut u8, n: usize) {
__aeabi_memset(dest, n, 0);
}

#[cfg(not(any(target_os = "ios", target_env = "msvc")))]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
#[cfg_attr(thumb, linkage = "weak")]
#[linkage = "weak"]
pub unsafe extern "aapcs" fn __aeabi_memclr4(dest: *mut u8, n: usize) {
__aeabi_memset4(dest, n, 0);
}

#[cfg(not(any(target_os = "ios", target_env = "msvc")))]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
#[cfg_attr(thumb, linkage = "weak")]
#[linkage = "weak"]
pub unsafe extern "aapcs" fn __aeabi_memclr8(dest: *mut u8, n: usize) {
__aeabi_memset4(dest, n, 0);
}