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#![cfg(not(feature = "no-asm"))]
#![allow(unused_imports)]
use core::intrinsics;
// iOS symbols have a leading underscore.
#[cfg(target_os = "ios")]
macro_rules! bl {
($func:literal) => {
concat!("bl _", $func)
};
}
#[cfg(not(target_os = "ios"))]
macro_rules! bl {
($func:literal) => {
concat!("bl ", $func)
};
}
intrinsics! {
// NOTE This function and the ones below are implemented using assembly because they are using a
// custom calling convention which can't be implemented using a normal Rust function.
#[naked]
#[cfg(not(target_env = "msvc"))]
pub unsafe extern "C" fn __aeabi_uidivmod() {
core::arch::asm!(
"push {{lr}}",
"sub sp, sp, #4",
"mov r2, sp",
bl!("__udivmodsi4"),
"ldr r1, [sp]",
"add sp, sp, #4",
"pop {{pc}}",
options(noreturn)
);
}
#[naked]
pub unsafe extern "C" fn __aeabi_uldivmod() {
core::arch::asm!(
"push {{r4, lr}}",
"sub sp, sp, #16",
"add r4, sp, #8",
"str r4, [sp]",
bl!("__udivmoddi4"),
"ldr r2, [sp, #8]",
"ldr r3, [sp, #12]",
"add sp, sp, #16",
"pop {{r4, pc}}",
options(noreturn)
);
}
#[naked]
pub unsafe extern "C" fn __aeabi_idivmod() {
core::arch::asm!(
"push {{r0, r1, r4, lr}}",
bl!("__aeabi_idiv"),
"pop {{r1, r2}}",
"muls r2, r2, r0",
"subs r1, r1, r2",
"pop {{r4, pc}}",
options(noreturn)
);
}
#[naked]
pub unsafe extern "C" fn __aeabi_ldivmod() {
core::arch::asm!(
"push {{r4, lr}}",
"sub sp, sp, #16",
"add r4, sp, #8",
"str r4, [sp]",
bl!("__divmoddi4"),
"ldr r2, [sp, #8]",
"ldr r3, [sp, #12]",
"add sp, sp, #16",
"pop {{r4, pc}}",
options(noreturn)
);
}
// 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"))]
#[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"))]
#[linkage = "weak"]
pub unsafe extern "aapcs" fn __aeabi_memcpy4(dest: *mut u8, src: *const u8, n: usize) {
// We are guaranteed 4-alignment, so accessing at u32 is okay.
let mut dest = dest as *mut u32;
let mut src = src as *mut u32;
let mut n = n;
while n >= 4 {
*dest = *src;
dest = dest.offset(1);
src = src.offset(1);
n -= 4;
}
__aeabi_memcpy(dest as *mut u8, src as *const u8, n);
}
#[cfg(not(target_os = "ios"))]
#[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"))]
#[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")))]
#[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")))]
#[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"))]
#[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"))]
#[linkage = "weak"]
pub unsafe extern "aapcs" fn __aeabi_memset4(dest: *mut u8, n: usize, c: i32) {
let mut dest = dest as *mut u32;
let mut n = n;
let byte = (c as u32) & 0xff;
let c = (byte << 24) | (byte << 16) | (byte << 8) | byte;
while n >= 4 {
*dest = c;
dest = dest.offset(1);
n -= 4;
}
__aeabi_memset(dest as *mut u8, n, byte as i32);
}
#[cfg(not(target_os = "ios"))]
#[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"))]
#[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")))]
#[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")))]
#[linkage = "weak"]
pub unsafe extern "aapcs" fn __aeabi_memclr8(dest: *mut u8, n: usize) {
__aeabi_memset4(dest, n, 0);
}
}
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