root/arch/powerpc/lib/mem_64.S

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * String handling functions for PowerPC.
   4  *
   5  * Copyright (C) 1996 Paul Mackerras.
   6  */
   7 #include <asm/processor.h>
   8 #include <asm/errno.h>
   9 #include <asm/ppc_asm.h>
  10 #include <asm/export.h>
  11 #include <asm/kasan.h>
  12 
  13 #ifndef CONFIG_KASAN
  14 _GLOBAL(__memset16)
  15         rlwimi  r4,r4,16,0,15
  16         /* fall through */
  17 
  18 _GLOBAL(__memset32)
  19         rldimi  r4,r4,32,0
  20         /* fall through */
  21 
  22 _GLOBAL(__memset64)
  23         neg     r0,r3
  24         andi.   r0,r0,7
  25         cmplw   cr1,r5,r0
  26         b       .Lms
  27 EXPORT_SYMBOL(__memset16)
  28 EXPORT_SYMBOL(__memset32)
  29 EXPORT_SYMBOL(__memset64)
  30 #endif
  31 
  32 _GLOBAL_KASAN(memset)
  33         neg     r0,r3
  34         rlwimi  r4,r4,8,16,23
  35         andi.   r0,r0,7                 /* # bytes to be 8-byte aligned */
  36         rlwimi  r4,r4,16,0,15
  37         cmplw   cr1,r5,r0               /* do we get that far? */
  38         rldimi  r4,r4,32,0
  39 .Lms:   PPC_MTOCRF(1,r0)
  40         mr      r6,r3
  41         blt     cr1,8f
  42         beq     3f                      /* if already 8-byte aligned */
  43         subf    r5,r0,r5
  44         bf      31,1f
  45         stb     r4,0(r6)
  46         addi    r6,r6,1
  47 1:      bf      30,2f
  48         sth     r4,0(r6)
  49         addi    r6,r6,2
  50 2:      bf      29,3f
  51         stw     r4,0(r6)
  52         addi    r6,r6,4
  53 3:      srdi.   r0,r5,6
  54         clrldi  r5,r5,58
  55         mtctr   r0
  56         beq     5f
  57         .balign 16
  58 4:      std     r4,0(r6)
  59         std     r4,8(r6)
  60         std     r4,16(r6)
  61         std     r4,24(r6)
  62         std     r4,32(r6)
  63         std     r4,40(r6)
  64         std     r4,48(r6)
  65         std     r4,56(r6)
  66         addi    r6,r6,64
  67         bdnz    4b
  68 5:      srwi.   r0,r5,3
  69         clrlwi  r5,r5,29
  70         PPC_MTOCRF(1,r0)
  71         beq     8f
  72         bf      29,6f
  73         std     r4,0(r6)
  74         std     r4,8(r6)
  75         std     r4,16(r6)
  76         std     r4,24(r6)
  77         addi    r6,r6,32
  78 6:      bf      30,7f
  79         std     r4,0(r6)
  80         std     r4,8(r6)
  81         addi    r6,r6,16
  82 7:      bf      31,8f
  83         std     r4,0(r6)
  84         addi    r6,r6,8
  85 8:      cmpwi   r5,0
  86         PPC_MTOCRF(1,r5)
  87         beqlr
  88         bf      29,9f
  89         stw     r4,0(r6)
  90         addi    r6,r6,4
  91 9:      bf      30,10f
  92         sth     r4,0(r6)
  93         addi    r6,r6,2
  94 10:     bflr    31
  95         stb     r4,0(r6)
  96         blr
  97 EXPORT_SYMBOL(memset)
  98 EXPORT_SYMBOL_KASAN(memset)
  99 
 100 _GLOBAL_TOC_KASAN(memmove)
 101         cmplw   0,r3,r4
 102         bgt     backwards_memcpy
 103         b       memcpy
 104 
 105 _GLOBAL(backwards_memcpy)
 106         rlwinm. r7,r5,32-3,3,31         /* r0 = r5 >> 3 */
 107         add     r6,r3,r5
 108         add     r4,r4,r5
 109         beq     2f
 110         andi.   r0,r6,3
 111         mtctr   r7
 112         bne     5f
 113         .balign 16
 114 1:      lwz     r7,-4(r4)
 115         lwzu    r8,-8(r4)
 116         stw     r7,-4(r6)
 117         stwu    r8,-8(r6)
 118         bdnz    1b
 119         andi.   r5,r5,7
 120 2:      cmplwi  0,r5,4
 121         blt     3f
 122         lwzu    r0,-4(r4)
 123         subi    r5,r5,4
 124         stwu    r0,-4(r6)
 125 3:      cmpwi   0,r5,0
 126         beqlr
 127         mtctr   r5
 128 4:      lbzu    r0,-1(r4)
 129         stbu    r0,-1(r6)
 130         bdnz    4b
 131         blr
 132 5:      mtctr   r0
 133 6:      lbzu    r7,-1(r4)
 134         stbu    r7,-1(r6)
 135         bdnz    6b
 136         subf    r5,r0,r5
 137         rlwinm. r7,r5,32-3,3,31
 138         beq     2b
 139         mtctr   r7
 140         b       1b
 141 EXPORT_SYMBOL(memmove)
 142 EXPORT_SYMBOL_KASAN(memmove)