diff options
Diffstat (limited to 'lib/libm/arch/amd64/abi.h')
| -rw-r--r-- | lib/libm/arch/amd64/abi.h | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/lib/libm/arch/amd64/abi.h b/lib/libm/arch/amd64/abi.h index 53b40f196eb..a94d7961b36 100644 --- a/lib/libm/arch/amd64/abi.h +++ b/lib/libm/arch/amd64/abi.h @@ -1,4 +1,4 @@ -/* $OpenBSD: abi.h,v 1.4 2010/06/03 16:38:50 deraadt Exp $ */ +/* $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 $ */ /* @@ -44,3 +44,25 @@ #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 |