newlib/libc/machine/xtensa/xtensa-asm.h

   1 /* Copyright (c) 2006 Tensilica Inc.
   2
   3    Permission is hereby granted, free of charge, to any person obtaining
   4    a copy of this software and associated documentation files (the
   5    "Software"), to deal in the Software without restriction, including
   6    without limitation the rights to use, copy, modify, merge, publish,
   7    distribute, sublicense, and/or sell copies of the Software, and to
   8    permit persons to whom the Software is furnished to do so, subject to
   9    the following conditions:
  10
  11    The above copyright notice and this permission notice shall be included
  12    in all copies or substantial portions of the Software.
  13
  14    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  15    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  16    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  17    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  18    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  19    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  20    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
  21
  22 /* Define macros for leaf function entry and return, supporting either the
  23  * standard register windowed ABI or the non-windowed call0 ABI.  These
  24  * macros do not allocate any extra stack space, so they only work for
  25  * leaf functions that do not need to spill anything to the stack.  */
  26
  27 #include <xtensa/config/core-isa.h>
  28
  29         .macro leaf_entry reg, size
  30 #if XCHAL_HAVE_WINDOWED && !__XTENSA_CALL0_ABI__
  31         entry \reg, \size
  32 #else
  33         /* do nothing */
  34 #endif
  35         .endm
  36
  37         .macro leaf_return
  38 #if XCHAL_HAVE_WINDOWED && !__XTENSA_CALL0_ABI__
  39         retw
  40 #else
  41         ret
  42 #endif
  43         .endm
  44
  45         .macro  src_b   r, w0, w1
  46 #ifdef __XTENSA_EB__
  47         src     \r, \w0, \w1
  48 #else
  49         src     \r, \w1, \w0
  50 #endif
  51         .endm
  52
  53         .macro  ssa8    r
  54 #ifdef __XTENSA_EB__
  55         ssa8b   \r
  56 #else
  57         ssa8l   \r
  58 #endif
  59         .endm
  60
  61 #if XCHAL_HAVE_BE
  62 #define MASK0 0xff000000
  63 #define MASK1 0x00ff0000
  64 #define MASK2 0x0000ff00
  65 #define MASK3 0x000000ff
  66 #else
  67 #define MASK0 0x000000ff
  68 #define MASK1 0x0000ff00
  69 #define MASK2 0x00ff0000
  70 #define MASK3 0xff000000
  71 #endif
  72