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Rewrite the arm mem* builtins without asm and naked functions

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This commit is contained in:
Amanieu d'Antras 2016-08-08 07:20:39 +01:00
parent 986c4aae74
commit 36fb191695
1 changed files with 67 additions and 60 deletions
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127
src/arm.rs
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@ -1,67 +1,74 @@
use core::intrinsics;
macro_rules! defer {
($($symbol:ident),+ -> $routine:ident) => {
$(
#[naked]
#[no_mangle]
pub extern "C" fn $symbol() {
unsafe {
asm!(concat!("b ", stringify!($routine)));
intrinsics::unreachable();
}
}
)+
}
extern "C" {
fn memcmp(s1: *const u8, s2: *const u8, n: usize) -> i32;
fn memcpy(dest: *mut u8, src: *const u8, n: usize) -> *mut u8;
fn memmove(dest: *mut u8, src: *const u8, n: usize) -> *mut u8;
fn memset(dest: *mut u8, c: i32, n: usize) -> *mut u8;
}
// FIXME only `__aeabi_memcmp` should be defined like this. The `*4` and `*8` variants should be
// defined as aliases of `__aeabi_memcmp`
defer!(__aeabi_memcmp, __aeabi_memcmp4, __aeabi_memcmp8 -> memcmp);
// FIXME: The `*4` and `*8` variants should be defined as aliases.
// FIXME same issue as `__aeabi_memcmp*`
defer!(__aeabi_memcpy, __aeabi_memcpy4, __aeabi_memcpy8 -> memcpy);
// FIXME same issue as `__aeabi_memcmp*`
defer!(__aeabi_memmove, __aeabi_memmove4, __aeabi_memmove8 -> memmove);
macro_rules! memset {
($($symbol:ident),+) => {
$(
#[naked]
#[no_mangle]
pub extern "C" fn $symbol() {
unsafe {
asm!("mov r3, r1
mov r1, r2
mov r2, r3
b memset");
intrinsics::unreachable();
}
}
)+
}
#[no_mangle]
pub unsafe extern "aapcs" fn __aeabi_memcmp(s1: *const u8, s2: *const u8, n: usize) -> i32 {
memcmp(s1, s2, n)
}
#[no_mangle]
pub unsafe extern "aapcs" fn __aeabi_memcmp4(s1: *const u8, s2: *const u8, n: usize) -> i32 {
memcmp(s1, s2, n)
}
#[no_mangle]
pub unsafe extern "aapcs" fn __aeabi_memcmp8(s1: *const u8, s2: *const u8, n: usize) -> i32 {
memcmp(s1, s2, n)
}
// FIXME same issue as `__aeabi_memcmp*`
memset!(__aeabi_memset, __aeabi_memset4, __aeabi_memset8);
macro_rules! memclr {
($($symbol:ident),+) => {
$(
#[naked]
#[no_mangle]
pub extern "C" fn $symbol() {
unsafe {
asm!("mov r2, r1
mov r1, #0
b memset");
intrinsics::unreachable();
}
}
)+
}
#[no_mangle]
pub unsafe extern "aapcs" fn __aeabi_memcpy(dest: *mut u8, src: *const u8, n: usize) {
memcpy(dest, src, n);
}
#[no_mangle]
pub unsafe extern "aapcs" fn __aeabi_memcpy4(dest: *mut u8, src: *const u8, n: usize) {
memcpy(dest, src, n);
}
#[no_mangle]
pub unsafe extern "aapcs" fn __aeabi_memcpy8(dest: *mut u8, src: *const u8, n: usize) {
memcpy(dest, src, n);
}
// FIXME same issue as `__aeabi_memcmp*`
memclr!(__aeabi_memclr, __aeabi_memclr4, __aeabi_memclr8);
#[no_mangle]
pub unsafe extern "aapcs" fn __aeabi_memmove(dest: *mut u8, src: *const u8, n: usize) {
memmove(dest, src, n);
}
#[no_mangle]
pub unsafe extern "aapcs" fn __aeabi_memmove4(dest: *mut u8, src: *const u8, n: usize) {
memmove(dest, src, n);
}
#[no_mangle]
pub unsafe extern "aapcs" fn __aeabi_memmove8(dest: *mut u8, src: *const u8, n: usize) {
memmove(dest, src, n);
}
// Note the different argument order
#[no_mangle]
pub unsafe extern "aapcs" fn __aeabi_memset(dest: *mut u8, n: usize, c: i32) {
memset(dest, c, n);
}
#[no_mangle]
pub unsafe extern "aapcs" fn __aeabi_memset4(dest: *mut u8, n: usize, c: i32) {
memset(dest, c, n);
}
#[no_mangle]
pub unsafe extern "aapcs" fn __aeabi_memset8(dest: *mut u8, n: usize, c: i32) {
memset(dest, c, n);
}
#[no_mangle]
pub unsafe extern "aapcs" fn __aeabi_memclr(dest: *mut u8, n: usize) {
memset(dest, 0, n);
}
#[no_mangle]
pub unsafe extern "aapcs" fn __aeabi_memclr4(dest: *mut u8, n: usize) {
memset(dest, 0, n);
}
#[no_mangle]
pub unsafe extern "aapcs" fn __aeabi_memclr8(dest: *mut u8, n: usize) {
memset(dest, 0, n);
}