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/* $OpenBSD: abi.h,v 1.5 2016/09/12 19:47:01 guenther Exp $ */
/* $NetBSD: abi.h,v 1.2 2003/09/14 21:26:14 fvdl Exp $ */
/*
* Written by Frank van der Linden (fvdl@wasabisystems.com)
*/
/*
* The x86-64 ABI specifies that float, double and long double
* arguments are passed in SSE2 (xmm) registers. Unfortunately,
* there is no way to push those on to the FP stack, which is
* where the fancier instructions get their arguments from.
*
* Define some prologues and epilogues to store and retrieve
* xmm regs to local variables.
*/
#define ARG_DOUBLE_ONE -8(%rsp)
#define ARG_DOUBLE_TWO -16(%rsp)
#define ARG_FLOAT_ONE -4(%rsp)
#define ARG_FLOAT_TWO -8(%rsp)
#define XMM_ONE_ARG_DOUBLE_PROLOGUE \
movsd %xmm0, ARG_DOUBLE_ONE
#define XMM_TWO_ARG_DOUBLE_PROLOGUE \
movsd %xmm0, ARG_DOUBLE_ONE ; \
movsd %xmm1, ARG_DOUBLE_TWO
#define XMM_ONE_ARG_FLOAT_PROLOGUE \
movss %xmm0, ARG_FLOAT_ONE
#define XMM_TWO_ARG_FLOAT_PROLOGUE \
movss %xmm0, ARG_FLOAT_ONE ; \
movss %xmm1, ARG_FLOAT_TWO
#define XMM_DOUBLE_EPILOGUE \
fstpl ARG_DOUBLE_ONE ; \
movsd ARG_DOUBLE_ONE, %xmm0
#define XMM_FLOAT_EPILOGUE \
fstps ARG_FLOAT_ONE ; \
movss ARG_FLOAT_ONE, %xmm0
#define FLDL_VAR(x) fldl x(%rip)
/*
* We define a hidden alias with the prefix "_libm_" for each global symbol
* that may be used internally. By referencing _libm_x instead of x, other
* parts of libm prevent overriding by the application and avoid unnecessary
* relocations.
*/
#define _HIDDEN(x) _libm_##x
#define _HIDDEN_ALIAS(x,y) \
STRONG_ALIAS(_HIDDEN(x),y); \
.hidden _HIDDEN(x)
#define _HIDDEN_FALIAS(x,y) \
_HIDDEN_ALIAS(x,y); \
.type _HIDDEN(x),@function
/*
* For functions implemented in ASM that are used internally
* END_STD(x) Like DEF_STD() in C; for standard/reserved C names
* END_NONSTD(x) Like DEF_NONSTD() in C; for non-ISO C names
*/
#define END_STD(x) END(x); _HIDDEN_FALIAS(x,x); END(_HIDDEN(x))
#define END_NONSTD(x) END_STD(x); .weak x
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