abi.h   [plain text]

/*	$NetBSD: abi.h,v 1.1 2001/06/19 00:26:29 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 he fancier instructions get their arguments from.
 *
 * Define some prologues and epilogues to store and retrieve
 * xmm regs to local variables.
 */

#ifdef __x86_64__

#error these interfaces appear to violate the red zone

    #define ARG_LONG_DOUBLE_ONE		-4(%esp)  
    #define ARG_LONG_DOUBLE_TWO		-20(%esp) 
    #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_LONG_DOUBLE_PROLOGUE
    #define XMM_TWO_ARG_LONG_DOUBLE_PROLOGUE

    #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_LONG_DOUBLE_EPILOGUE

    #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
    
#else

    #define ARG_LONG_DOUBLE_ONE		4(%esp)
    #define ARG_LONG_DOUBLE_TWO		20(%esp)
    #define ARG_DOUBLE_ONE		4(%esp)
    #define ARG_DOUBLE_TWO		12(%esp)
    #define ARG_FLOAT_ONE		4(%esp)
    #define ARG_FLOAT_TWO		8(%esp)

    #define XMM_ONE_ARG_LONG_DOUBLE_PROLOGUE
    #define XMM_TWO_ARG_LONG_DOUBLE_PROLOGUE
    #define XMM_ONE_ARG_DOUBLE_PROLOGUE
    #define XMM_TWO_ARG_DOUBLE_PROLOGUE
    #define XMM_ONE_ARG_FLOAT_PROLOGUE
    #define XMM_TWO_ARG_FLOAT_PROLOGUE

    #define XMM_LONG_DOUBLE_EPILOGUE
    #define XMM_DOUBLE_EPILOGUE
    #define XMM_FLOAT_EPILOGUE

#endif