arch/m32r/lib/memcpy.S

   1 /*
   2  *  linux/arch/m32r/lib/memcpy.S
   3  *
   4  *  Copyright (C) 2001  Hiroyuki Kondo, and Hirokazu Takata
   5  *  Copyright (C) 2004  Hirokazu Takata
   6  *
   7  *  void *memcopy(void *dst, const void *src, int n);
   8  *
   9  *        dst: r0
  10  *        src: r1
  11  *        n  : r2
  12  */
  13 /* $Id$ */
  14
  15
  16         .text
  17 #include <linux/linkage.h>
  18 #include <asm/assembler.h>
  19
  20 #ifdef CONFIG_ISA_DUAL_ISSUE
  21
  22         .text
  23 ENTRY(memcpy)
  24 memcopy:
  25         mv      r4, r0              ||  mv      r7, r0
  26         or      r7, r1              ||  cmpz    r2
  27         jc      r14                 ||  cmpeq   r0, r1  ; return if r2=0
  28         jc      r14                                     ; return if r0=r1
  29
  30         and3    r7, r7, #3
  31         bnez    r7, byte_copy
  32         srl3    r3, r2, #2
  33         and3    r2, r2, #3
  34         beqz    r3, byte_copy
  35         addi    r4, #-4
  36 word_copy:
  37         ld      r7, @r1+            ||  addi    r3, #-1
  38         st      r7, @+r4            ||  cmpz    r2
  39         bnez    r3, word_copy
  40         addi    r4, #4              ||  jc      r14     ; return if r2=0
  41 #if defined(CONFIG_ISA_M32R2)
  42 byte_copy:
  43         ldb     r7, @r1             ||  addi    r1, #1
  44         addi    r2, #-1             ||  stb     r7, @r4+
  45         bnez    r2, byte_copy
  46 #elif defined(CONFIG_ISA_M32R)
  47 byte_copy:
  48         ldb     r7, @r1             ||  addi    r1, #1
  49         addi    r2, #-1             ||  stb     r7, @r4
  50         addi    r4, #1
  51         bnez    r2, byte_copy
  52 #else
  53 #error unknown isa configuration
  54 #endif
  55 end_memcopy:
  56         jmp     r14
  57
  58 #else /* not CONFIG_ISA_DUAL_ISSUE */
  59
  60         .text
  61 ENTRY(memcpy)
  62 memcopy:
  63         mv      r4, r0
  64         mv      r7, r0
  65         or      r7, r1
  66         beq     r0, r1, end_memcopy
  67         beqz    r2, end_memcopy
  68
  69         and3    r7, r7, #3
  70         bnez    r7, byte_copy
  71         srl3    r3, r2, #2
  72         and3    r2, r2, #3
  73         beqz    r3, byte_copy
  74         addi    r4, #-4
  75 word_copy:
  76         ld      r7, @r1+
  77         addi    r3, #-1
  78         st      r7, @+r4
  79         bnez    r3, word_copy
  80         beqz    r2, end_memcopy
  81         addi    r4, #4
  82 byte_copy:
  83         ldb     r7, @r1
  84         addi    r1, #1
  85         addi    r2, #-1
  86         stb     r7, @r4
  87         addi    r4, #1
  88         bnez    r2, byte_copy
  89 end_memcopy:
  90         jmp     r14
  91
  92 #endif /* not CONFIG_ISA_DUAL_ISSUE */
  93
  94         .end