1 /* $OpenBSD: abi.h,v 1.5 2016/09/12 19:47:01 guenther Exp $ */ 2 /* $NetBSD: abi.h,v 1.2 2003/09/14 21:26:14 fvdl Exp $ */ 3 4 /* 5 * Written by Frank van der Linden (fvdl@wasabisystems.com) 6 */ 7 8 /* 9 * The x86-64 ABI specifies that float, double and long double 10 * arguments are passed in SSE2 (xmm) registers. Unfortunately, 11 * there is no way to push those on to the FP stack, which is 12 * where the fancier instructions get their arguments from. 13 * 14 * Define some prologues and epilogues to store and retrieve 15 * xmm regs to local variables. 16 */ 17 18 #define ARG_DOUBLE_ONE -8(%rsp) 19 #define ARG_DOUBLE_TWO -16(%rsp) 20 #define ARG_FLOAT_ONE -4(%rsp) 21 #define ARG_FLOAT_TWO -8(%rsp) 22 23 #define XMM_ONE_ARG_DOUBLE_PROLOGUE \ 24 movsd %xmm0, ARG_DOUBLE_ONE 25 26 #define XMM_TWO_ARG_DOUBLE_PROLOGUE \ 27 movsd %xmm0, ARG_DOUBLE_ONE ; \ 28 movsd %xmm1, ARG_DOUBLE_TWO 29 30 #define XMM_ONE_ARG_FLOAT_PROLOGUE \ 31 movss %xmm0, ARG_FLOAT_ONE 32 33 #define XMM_TWO_ARG_FLOAT_PROLOGUE \ 34 movss %xmm0, ARG_FLOAT_ONE ; \ 35 movss %xmm1, ARG_FLOAT_TWO 36 37 #define XMM_DOUBLE_EPILOGUE \ 38 fstpl ARG_DOUBLE_ONE ; \ 39 movsd ARG_DOUBLE_ONE, %xmm0 40 41 #define XMM_FLOAT_EPILOGUE \ 42 fstps ARG_FLOAT_ONE ; \ 43 movss ARG_FLOAT_ONE, %xmm0 44 45 #define FLDL_VAR(x) fldl x(%rip) 46 47 48 /* 49 * We define a hidden alias with the prefix "_libm_" for each global symbol 50 * that may be used internally. By referencing _libm_x instead of x, other 51 * parts of libm prevent overriding by the application and avoid unnecessary 52 * relocations. 53 */ 54 #define _HIDDEN(x) _libm_##x 55 #define _HIDDEN_ALIAS(x,y) \ 56 STRONG_ALIAS(_HIDDEN(x),y); \ 57 .hidden _HIDDEN(x) 58 #define _HIDDEN_FALIAS(x,y) \ 59 _HIDDEN_ALIAS(x,y); \ 60 .type _HIDDEN(x),@function 61 62 /* 63 * For functions implemented in ASM that are used internally 64 * END_STD(x) Like DEF_STD() in C; for standard/reserved C names 65 * END_NONSTD(x) Like DEF_NONSTD() in C; for non-ISO C names 66 */ 67 #define END_STD(x) END(x); _HIDDEN_FALIAS(x,x); END(_HIDDEN(x)) 68 #define END_NONSTD(x) END_STD(x); .weak x 69