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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
|
|
