65 lines
2.6 KiB
ArmAsm
65 lines
2.6 KiB
ArmAsm
/*
|
|
* Copyright (C) 2012 Andrew Turner
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* These calculate:
|
|
* q = n / m
|
|
* With a remainer r.
|
|
*
|
|
* They take n in {r0, r1} and m in {r2, r3} then pass them into the
|
|
* helper function. The hepler functions return q in {r0, r1} as
|
|
* required by the API spec however r is returned on the stack. The
|
|
* ABI required us to return r in {r2, r3}.
|
|
*
|
|
* We need to allocate 8 bytes on the stack to store r, the link
|
|
* register, and a pointer to the space where the helper function
|
|
* will write r to. After returning from the helper fuinction we load
|
|
* the old link register and r from the stack and return.
|
|
*/
|
|
ENTRY_NP(__aeabi_ldivmod)
|
|
sub sp, sp, #8 /* Space for the remainder */
|
|
stmfd sp!, {sp, lr} /* Save a pointer to the above space and lr */
|
|
bl PIC_SYM(_C_LABEL(__kern_ldivmod), PLT)
|
|
ldr lr, [sp, #4] /* Restore lr */
|
|
add sp, sp, #8 /* Move sp to the remainder value */
|
|
ldmfd sp!, {r2, r3} /* Load the remainder */
|
|
RET
|
|
END(__aeabi_ldivmod)
|
|
|
|
ENTRY_NP(__aeabi_uldivmod)
|
|
sub sp, sp, #8 /* Space for the remainder */
|
|
stmfd sp!, {sp, lr} /* Save a pointer to the above space and lr */
|
|
bl PIC_SYM(_C_LABEL(__qdivrem), PLT)
|
|
ldr lr, [sp, #4] /* Restore lr */
|
|
add sp, sp, #8 /* Move sp to the remainder value */
|
|
ldmfd sp!, {r2, r3} /* Load the remainder */
|
|
RET
|
|
END(__aeabi_uldivmod)
|