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