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      1 /*	$NetBSD: abi.h,v 1.8 2013/09/12 15:36:16 joerg Exp $	*/
      2 
      3 /*
      4  * Written by Frank van der Linden (fvdl (at) wasabisystems.com)
      5  */
      6 
      7 /*
      8  * The x86-64 ABI specifies that float and double arguments
      9  * 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_LONG_DOUBLE_ONE	8(%rsp)
     20 #define ARG_LONG_DOUBLE_TWO	24(%rsp)
     21 #define ARG_DOUBLE_ONE		-8(%rsp)
     22 #define ARG_DOUBLE_ONE_LSW	-8(%rsp)
     23 #define ARG_DOUBLE_ONE_MSW	-4(%rsp)
     24 #define ARG_DOUBLE_TWO		-16(%rsp)
     25 #define ARG_FLOAT_ONE		-4(%rsp)
     26 #define ARG_FLOAT_TWO		-8(%rsp)
     27 
     28 #define XMM_ONE_ARG_DOUBLE_PROLOGUE \
     29 	movsd	%xmm0, ARG_DOUBLE_ONE
     30 
     31 #define XMM_TWO_ARG_DOUBLE_PROLOGUE \
     32 	movsd	%xmm0, ARG_DOUBLE_ONE ; \
     33 	movsd	%xmm1, ARG_DOUBLE_TWO
     34 
     35 #define XMM_ONE_ARG_FLOAT_PROLOGUE \
     36 	movss	%xmm0, ARG_FLOAT_ONE
     37 
     38 #define XMM_TWO_ARG_FLOAT_PROLOGUE \
     39 	movss	%xmm0, ARG_FLOAT_ONE ; \
     40 	movss	%xmm1, ARG_FLOAT_TWO
     41 
     42 #define XMM_DOUBLE_EPILOGUE \
     43 	fstpl ARG_DOUBLE_ONE ; \
     44 	movsd ARG_DOUBLE_ONE, %xmm0
     45 
     46 #define XMM_FLOAT_EPILOGUE \
     47 	fstps ARG_FLOAT_ONE ; \
     48 	movss ARG_FLOAT_ONE, %xmm0
     49 
     50 #define FLDL_VAR(x)	fldl x(%rip)
     51 
     52 #else
     53 
     54 #define ARG_LONG_DOUBLE_ONE	4(%esp)
     55 #define ARG_LONG_DOUBLE_TWO	16(%esp)
     56 #define ARG_DOUBLE_ONE		4(%esp)
     57 #define ARG_DOUBLE_ONE_LSW	4(%esp)
     58 #define ARG_DOUBLE_ONE_MSW	8(%esp)
     59 #define ARG_DOUBLE_TWO		12(%esp)
     60 #define ARG_FLOAT_ONE		4(%esp)
     61 #define ARG_FLOAT_TWO		8(%esp)
     62 
     63 #define XMM_ONE_ARG_DOUBLE_PROLOGUE
     64 #define XMM_TWO_ARG_DOUBLE_PROLOGUE
     65 #define XMM_ONE_ARG_FLOAT_PROLOGUE
     66 #define XMM_TWO_ARG_FLOAT_PROLOGUE
     67 
     68 #define XMM_DOUBLE_EPILOGUE
     69 #define XMM_FLOAT_EPILOGUE
     70 
     71 #ifdef __PIC__
     72 #define FLDL_VAR(x) \
     73 	PIC_PROLOGUE ; \
     74 	fldl PIC_GOTOFF(x) ; \
     75 	PIC_EPILOGUE
     76 #else
     77 #define FLDL_VAR(x) \
     78 	fldl x
     79 
     80 #endif
     81 #endif
     82