src/system/libroot/os/arch/arm/byteorder.S

   1 /*
   2  * Copyright 2009, Johannes Wischert. All rights reserved.
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6 #include <asm_defs.h>
   7
   8 .text
   9
  10 /* uint16 __swap_int16(uint16 value)
  11  */
  12 FUNCTION(__swap_int16):
  13 #if __ARM_ARCH__ >= 6
  14                 rev16 r0,r0;
  15 #else
  16 #warning IMPLEMENT_ME
  17                 and r1,r0,#0x000000ff
  18                 and r2,r0,#0x0000ff00
  19                 mov r1,r1,LSL #8
  20                 mov r2,r2,ROR #8
  21                 orr r0,r1,r2
  22 #endif
  23                 mov pc,lr
  24 FUNCTION_END(__swap_int16)
  25
  26 /* uint32 __swap_int32(uint32 value)
  27  */
  28 FUNCTION(__swap_int32):
  29 #if __ARM_ARCH__ >= 6
  30                 rev r0,r0;
  31 #else
  32 #warning IMPLEMENT_ME
  33                 mov r3,#0xff000000
  34                 orr r3,#0x0000ff00
  35                 and r1,r0,r3
  36                 mov r1,r1,ROR #24
  37                 mov r3,r3,ROR #8
  38                 and r2,r0,r3
  39                 mov r2,r2,ROR #8
  40                 orr r0,r1,r2
  41 #endif
  42                 mov pc,lr
  43 FUNCTION_END(__swap_int32)
  44
  45 /* uint64 __swap_int64(uint64 value)
  46  */
  47 FUNCTION(__swap_int64):
  48 #if __ARM_ARCH__ >= 6
  49                 rev r0,r0;
  50                 rev r1,r1;
  51                 mov r12,r0;
  52                 mov r0,r1;
  53                 mov r1,r12;
  54 #else
  55 #warning IMPLEMENT_ME
  56 #endif
  57                 mov pc,lr
  58 FUNCTION_END(__swap_int64)
  59
  60 /* TODO: The following functions can surely be optimized. A simple optimization
  61  * would be to define macros with the contents of the __swap_int{32,64}
  62  * functions and use those instead of calling the functions.
  63  */
  64
  65 /* float __swap_float(float value)
  66  */
  67 FUNCTION(__swap_float):
  68                 b               __swap_int32
  69                 //rts
  70 FUNCTION_END(__swap_float)
  71
  72
  73 /* double __swap_double(double value)
  74  */
  75 FUNCTION(__swap_double):
  76                 b               __swap_int32
  77                 //rts
  78 #warning M68K: XXX:check sizeof(double)
  79 FUNCTION_END(__swap_double)
  80