memcpy.S
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/*
* linux/arch/m32r/lib/memcpy.S
*
* Copyright (C) 2001 Hiroyuki Kondo, and Hirokazu Takata
* Copyright (C) 2004 Hirokazu Takata
*
* void *memcopy(void *dst, const void *src, int n);
*
* dst: r0
* src: r1
* n : r2
*/
.text
#include <linux/linkage.h>
#include <asm/assembler.h>
#ifdef CONFIG_ISA_DUAL_ISSUE
.text
ENTRY(memcpy)
memcopy:
mv r4, r0 || mv r7, r0
or r7, r1 || cmpz r2
jc r14 || cmpeq r0, r1 ; return if r2=0
jc r14 ; return if r0=r1
and3 r7, r7, #3
bnez r7, byte_copy
srl3 r3, r2, #2
and3 r2, r2, #3
beqz r3, byte_copy
addi r4, #-4
word_copy:
ld r7, @r1+ || addi r3, #-1
st r7, @+r4 || cmpz r2
bnez r3, word_copy
addi r4, #4 || jc r14 ; return if r2=0
#if defined(CONFIG_ISA_M32R2)
byte_copy:
ldb r7, @r1 || addi r1, #1
addi r2, #-1 || stb r7, @r4+
bnez r2, byte_copy
#elif defined(CONFIG_ISA_M32R)
byte_copy:
ldb r7, @r1 || addi r1, #1
addi r2, #-1 || stb r7, @r4
addi r4, #1
bnez r2, byte_copy
#else
#error unknown isa configuration
#endif
end_memcopy:
jmp r14
#else /* not CONFIG_ISA_DUAL_ISSUE */
.text
ENTRY(memcpy)
memcopy:
mv r4, r0
mv r7, r0
or r7, r1
beq r0, r1, end_memcopy
beqz r2, end_memcopy
and3 r7, r7, #3
bnez r7, byte_copy
srl3 r3, r2, #2
and3 r2, r2, #3
beqz r3, byte_copy
addi r4, #-4
word_copy:
ld r7, @r1+
addi r3, #-1
st r7, @+r4
bnez r3, word_copy
beqz r2, end_memcopy
addi r4, #4
byte_copy:
ldb r7, @r1
addi r1, #1
addi r2, #-1
stb r7, @r4
addi r4, #1
bnez r2, byte_copy
end_memcopy:
jmp r14
#endif /* not CONFIG_ISA_DUAL_ISSUE */
.end