root/arch/arm/lib/bswapsdi2.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #include <linux/linkage.h>
   3 #include <asm/assembler.h>
   4 
   5 #if __LINUX_ARM_ARCH__ >= 6
   6 ENTRY(__bswapsi2)
   7         rev r0, r0
   8         bx lr
   9 ENDPROC(__bswapsi2)
  10 
  11 ENTRY(__bswapdi2)
  12         rev r3, r0
  13         rev r0, r1
  14         mov r1, r3
  15         bx lr
  16 ENDPROC(__bswapdi2)
  17 #else
  18 ENTRY(__bswapsi2)
  19         eor r3, r0, r0, ror #16
  20         mov r3, r3, lsr #8
  21         bic r3, r3, #0xff00
  22         eor r0, r3, r0, ror #8
  23         ret lr
  24 ENDPROC(__bswapsi2)
  25 
  26 ENTRY(__bswapdi2)
  27         mov ip, r1
  28         eor r3, ip, ip, ror #16
  29         eor r1, r0, r0, ror #16
  30         mov r1, r1, lsr #8
  31         mov r3, r3, lsr #8
  32         bic r3, r3, #0xff00
  33         bic r1, r1, #0xff00
  34         eor r1, r1, r0, ror #8
  35         eor r0, r3, ip, ror #8
  36         ret lr
  37 ENDPROC(__bswapdi2)
  38 #endif