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