arch/arm/lib/io-writesl.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  linux/arch/arm/lib/io-writesl.S
   4  *
   5  *  Copyright (C) 1995-2000 Russell King
   6  */
   7 #include <linux/linkage.h>
   8 #include <asm/assembler.h>
   9
  10 ENTRY(__raw_writesl)
  11                 teq     r2, #0          @ do we have to check for the zero len?
  12                 reteq   lr
  13                 ands    ip, r1, #3
  14                 bne     3f
  15
  16                 subs    r2, r2, #4
  17                 bmi     2f
  18                 stmfd   sp!, {r4, lr}
  19 1:              ldmia   r1!, {r3, r4, ip, lr}
  20                 subs    r2, r2, #4
  21                 str     r3, [r0, #0]
  22                 str     r4, [r0, #0]
  23                 str     ip, [r0, #0]
  24                 str     lr, [r0, #0]
  25                 bpl     1b
  26                 ldmfd   sp!, {r4, lr}
  27 2:              movs    r2, r2, lsl #31
  28                 ldmiacs r1!, {r3, ip}
  29                 strcs   r3, [r0, #0]
  30                 ldrne   r3, [r1, #0]
  31                 strcs   ip, [r0, #0]
  32                 strne   r3, [r0, #0]
  33                 ret     lr
  34
  35 3:              bic     r1, r1, #3
  36                 ldr     r3, [r1], #4
  37                 cmp     ip, #2
  38                 blt     5f
  39                 bgt     6f
  40
  41 4:              mov     ip, r3, lspull #16
  42                 ldr     r3, [r1], #4
  43                 subs    r2, r2, #1
  44                 orr     ip, ip, r3, lspush #16
  45                 str     ip, [r0]
  46                 bne     4b
  47                 ret     lr
  48
  49 5:              mov     ip, r3, lspull #8
  50                 ldr     r3, [r1], #4
  51                 subs    r2, r2, #1
  52                 orr     ip, ip, r3, lspush #24
  53                 str     ip, [r0]
  54                 bne     5b
  55                 ret     lr
  56
  57 6:              mov     ip, r3, lspull #24
  58                 ldr     r3, [r1], #4
  59                 subs    r2, r2, #1
  60                 orr     ip, ip, r3, lspush #8
  61                 str     ip, [r0]
  62                 bne     6b
  63                 ret     lr
  64 ENDPROC(__raw_writesl)