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abi.h revision 1.3.32.1 
      1 /*	$NetBSD: abi.h,v 1.3.32.1 2008/09/18 04:39:23 wrstuden 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, 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
     78