diff options
Diffstat (limited to 'lib/libc/arch/sh/SYS.h')
| -rw-r--r-- | lib/libc/arch/sh/SYS.h | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/lib/libc/arch/sh/SYS.h b/lib/libc/arch/sh/SYS.h index 468e265c947..ac7991f7cd3 100644 --- a/lib/libc/arch/sh/SYS.h +++ b/lib/libc/arch/sh/SYS.h @@ -1,4 +1,4 @@ -/* $OpenBSD: SYS.h,v 1.6 2015/04/07 01:27:06 guenther Exp $ */ +/* $OpenBSD: SYS.h,v 1.7 2015/08/31 02:53:57 guenther Exp $ */ /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. @@ -37,6 +37,31 @@ #include <machine/asm.h> #include <sys/syscall.h> +/* + * We define a hidden alias with the prefix "_libc_" for each global symbol + * that may be used internally. By referencing _libc_x instead of x, other + * parts of libc prevent overriding by the application and avoid unnecessary + * relocations. + */ +#define _HIDDEN(x) _libc_##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 aren't syscalls. + * END_STRONG(x) Like DEF_STRONG() in C; for standard/reserved C names + * END_WEAK(x) Like DEF_WEAK() in C; for non-ISO C names + */ +#define END_STRONG(x) SET_ENTRY_SIZE(x); \ + _HIDDEN_FALIAS(x,x); \ + SET_ENTRY_SIZE(_HIDDEN(x)) +#define END_WEAK(x) END_STRONG(x); .weak x + + #define SYSENTRY(x) \ WEAK_ALIAS(x,_thread_sys_ ## x); \ ENTRY(_thread_sys_ ## x) |