131 lines
3.6 KiB
Rust
131 lines
3.6 KiB
Rust
use core::intrinsics;
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// NOTE This function and the ones below are implemented using assembly because they using a custom
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// calling convention which can't be implemented using a normal Rust function
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#[naked]
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe fn __aeabi_uidivmod() {
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asm!("push {lr}
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sub sp, sp, #4
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mov r2, sp
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bl __udivmodsi4
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ldr r1, [sp]
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add sp, sp, #4
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pop {pc}");
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intrinsics::unreachable();
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}
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#[naked]
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe fn __aeabi_uldivmod() {
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asm!("push {r4, lr}
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sub sp, sp, #16
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add r4, sp, #8
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str r4, [sp]
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bl __udivmoddi4
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ldr r2, [sp, #8]
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ldr r3, [sp, #12]
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add sp, sp, #16
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pop {r4, pc}");
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intrinsics::unreachable();
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}
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#[naked]
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe fn __aeabi_idivmod() {
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asm!("push {r0, r1, r4, lr}
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bl __divsi3
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pop {r1, r2}
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muls r2, r2, r0
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subs r1, r1, r2
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pop {r4, pc}");
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intrinsics::unreachable();
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}
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#[naked]
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe fn __aeabi_ldivmod() {
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asm!("push {r4, lr}
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sub sp, sp, #16
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add r4, sp, #8
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str r4, [sp]
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bl __divmoddi4
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ldr r2, [sp, #8]
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ldr r3, [sp, #12]
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add sp, sp, #16
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pop {r4, pc}");
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intrinsics::unreachable();
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}
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// TODO: These two functions should be defined as aliases
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#[cfg_attr(not(test), no_mangle)]
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pub extern "C" fn __aeabi_uidiv(a: u32, b: u32) -> u32 {
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::udiv::__udivsi3(a, b)
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}
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#[cfg_attr(not(test), no_mangle)]
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pub extern "C" fn __aeabi_idiv(a: i32, b: i32) -> i32 {
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::sdiv::__divsi3(a, b)
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}
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extern "C" {
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fn memcpy(dest: *mut u8, src: *const u8, n: usize) -> *mut u8;
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fn memmove(dest: *mut u8, src: *const u8, n: usize) -> *mut u8;
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fn memset(dest: *mut u8, c: i32, n: usize) -> *mut u8;
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}
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// FIXME: The `*4` and `*8` variants should be defined as aliases.
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe extern "C" fn __aeabi_memcpy(dest: *mut u8, src: *const u8, n: usize) {
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memcpy(dest, src, n);
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}
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe extern "C" fn __aeabi_memcpy4(dest: *mut u8, src: *const u8, n: usize) {
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memcpy(dest, src, n);
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}
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe extern "C" fn __aeabi_memcpy8(dest: *mut u8, src: *const u8, n: usize) {
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memcpy(dest, src, n);
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}
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe extern "C" fn __aeabi_memmove(dest: *mut u8, src: *const u8, n: usize) {
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memmove(dest, src, n);
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}
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe extern "C" fn __aeabi_memmove4(dest: *mut u8, src: *const u8, n: usize) {
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memmove(dest, src, n);
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}
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe extern "C" fn __aeabi_memmove8(dest: *mut u8, src: *const u8, n: usize) {
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memmove(dest, src, n);
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}
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// Note the different argument order
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe extern "C" fn __aeabi_memset(dest: *mut u8, n: usize, c: i32) {
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memset(dest, c, n);
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}
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe extern "C" fn __aeabi_memset4(dest: *mut u8, n: usize, c: i32) {
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memset(dest, c, n);
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}
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe extern "C" fn __aeabi_memset8(dest: *mut u8, n: usize, c: i32) {
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memset(dest, c, n);
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}
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe extern "C" fn __aeabi_memclr(dest: *mut u8, n: usize) {
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memset(dest, 0, n);
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}
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe extern "C" fn __aeabi_memclr4(dest: *mut u8, n: usize) {
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memset(dest, 0, n);
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}
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#[cfg_attr(not(test), no_mangle)]
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pub unsafe extern "C" fn __aeabi_memclr8(dest: *mut u8, n: usize) {
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memset(dest, 0, n);
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}
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