lib/libm/arch/i387/abi.h

   1 /*      $NetBSD: abi.h,v 1.5 2008/06/23 10:24:13 drochner Exp $ */
   2
   3 /*
   4  * Written by Frank van der Linden (fvdl@wasabisystems.com)
   5  */
   6
   7 /*
   8  * The x86-64 ABI specifies that float, double and long double
   9  * arguments are passed in SSE2 (xmm) registers. Unfortunately,
  10  * there is no way to push those on to the FP stack, which is
  11  * where the fancier instructions get their arguments from.
  12  *
  13  * Define some prologues and epilogues to store and retrieve
  14  * xmm regs to local variables.
  15  */
  16
  17 #ifdef __x86_64__
  18
  19 #define ARG_DOUBLE_ONE          -8(%rsp)
  20 #define ARG_DOUBLE_ONE_LSW      -8(%rsp)
  21 #define ARG_DOUBLE_ONE_MSW      -4(%rsp)
  22 #define ARG_DOUBLE_TWO          -16(%rsp)
  23 #define ARG_FLOAT_ONE           -4(%rsp)
  24 #define ARG_FLOAT_TWO           -8(%rsp)
  25
  26 #define XMM_ONE_ARG_DOUBLE_PROLOGUE \
  27         movsd   %xmm0, ARG_DOUBLE_ONE
  28
  29 #define XMM_TWO_ARG_DOUBLE_PROLOGUE \
  30         movsd   %xmm0, ARG_DOUBLE_ONE ; \
  31         movsd   %xmm1, ARG_DOUBLE_TWO
  32
  33 #define XMM_ONE_ARG_FLOAT_PROLOGUE \
  34         movss   %xmm0, ARG_FLOAT_ONE
  35
  36 #define XMM_TWO_ARG_FLOAT_PROLOGUE \
  37         movss   %xmm0, ARG_FLOAT_ONE ; \
  38         movss   %xmm1, ARG_FLOAT_TWO
  39
  40 #define XMM_DOUBLE_EPILOGUE \
  41         fstpl ARG_DOUBLE_ONE ; \
  42         movsd ARG_DOUBLE_ONE, %xmm0
  43
  44 #define XMM_FLOAT_EPILOGUE \
  45         fstps ARG_FLOAT_ONE ; \
  46         movss ARG_FLOAT_ONE, %xmm0
  47
  48 #define FLDL_VAR(x)     fldl x(%rip)
  49
  50 #else
  51
  52 #define ARG_DOUBLE_ONE          4(%esp)
  53 #define ARG_DOUBLE_ONE_LSW      4(%esp)
  54 #define ARG_DOUBLE_ONE_MSW      8(%esp)
  55 #define ARG_DOUBLE_TWO          12(%esp)
  56 #define ARG_FLOAT_ONE           4(%esp)
  57 #define ARG_FLOAT_TWO           8(%esp)
  58
  59 #define XMM_ONE_ARG_DOUBLE_PROLOGUE
  60 #define XMM_TWO_ARG_DOUBLE_PROLOGUE
  61 #define XMM_ONE_ARG_FLOAT_PROLOGUE
  62 #define XMM_TWO_ARG_FLOAT_PROLOGUE
  63
  64 #define XMM_DOUBLE_EPILOGUE
  65 #define XMM_FLOAT_EPILOGUE
  66
  67 #ifdef PIC
  68 #define FLDL_VAR(x) \
  69         PIC_PROLOGUE ; \
  70         fldl PIC_GOTOFF(x) ; \
  71         PIC_EPILOGUE
  72 #else
  73 #define FLDL_VAR(x) \
  74         fldl x
  75
  76 #endif
  77 #endif