diff options
Diffstat (limited to 'libc')
| -rw-r--r-- | libc/sysdeps/linux/common/sysdep.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/common/sysdep.h b/libc/sysdeps/linux/common/sysdep.h new file mode 100644 index 000000000..439062d6b --- /dev/null +++ b/libc/sysdeps/linux/common/sysdep.h @@ -0,0 +1,127 @@ +/* Copyright (C) 1991, 1992 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <sys/syscall.h> + +/* Not that using a `PASTE' macro loses. */ +#ifdef __STDC__ + +#ifdef __ELF__ + +#define SYSCALL_WEAK_ALIAS(alias,orig) \ + .weak alias; \ + alias=__libc_##orig + +/* +#ifdef _POSIX_THREADS +*/ + +#if 1 + +#ifdef PTHREAD_KERNEL + +/* Use the regular ELF conventions about underscores, and provide the + weak symbol, as required */ +#define SYSCALL__(name,args) PSEUDO (__machdep_sys_##name, name, args) \ +.weak machdep_sys_##name; \ + machdep_sys_##name = __machdep_sys_##name; \ +.type __machdep_sys_##name,@function; \ +.type machdep_sys_##name,@function; \ +.L__machdep_sys_##name##end: .size __machdep_sys_##name,.L__machdep_sys_##name##end - __machdep_sys_##name + +#define SYSCALL(name,args) PSEUDO (__machdep_sys_##name, name, args) \ +.weak machdep_sys_##name; \ + machdep_sys_##name = __machdep_sys_##name; \ +.type __machdep_sys_##name,@function; \ +.type machdep_sys_##name,@function; \ +.L__machdep_sys_##name##end: .size __machdep_sys_##name,.L__machdep_sys_##name##end - __machdep_sys_##name + +#else /* PTHREAD_KERNEL */ + +/* Use the regular ELF conventions about underscores, and provide the + weak symbol, as required */ +#define SYSCALL__(name,args) PSEUDO (__libc_##name, name, args) \ +.weak __##name; \ +.weak name; \ + __##name = __libc_##name; \ + name = __libc_##name; \ +.type __libc_##name,@function; \ +.type name,@function; \ +.type __##name,@function; \ +.L__libc_##name##end: .size __libc_##name,.L__libc_##name##end - __libc_##name + +#define SYSCALL(name,args) PSEUDO (__libc_##name, name, args) \ +.weak name; \ + name = __libc_##name; \ +.type __libc_##name,@function; \ +.type name,@function; \ +.L__libc_##name##end: .size __libc_##name,.L__libc_##name##end - __libc_##name + +#endif /* PTHREAD_KERNEL */ + +#else /* _POSIX_THREADS */ + +/* Use the regular ELF conventions about underscores, and provide the + weak symbol, as required */ +#define SYSCALL__(name,args) PSEUDO (__libc_##name, name, args) \ +.weak name; \ + __##name = __libc_##name; \ + name = __libc_##name; \ +.type __libc_##name,@function; \ +.type name,@function; \ +.type __##name,@function; \ +.L__libc_##name##end: .size __libc_##name,.L__libc_##name##end - __libc_##name + +#define SYSCALL(name,args) PSEUDO (__libc_##name, name, args) \ + name = __libc_##name; \ +.type __libc_##name,@function; \ +.type name,@function; \ +.L__libc_##name##end: .size __libc_##name,.L__libc_##name##end - __libc_##name + +#endif /* _POSIX_THREADS */ + +#else /* __ELF__ */ + +#define SYSCALL_WEAK_ALIAS(alias,orig) + +/* Regular a.out definition */ +#define SYSCALL__(name,args) PSEUDO (__##name, name, args) +#define SYSCALL(name,args) PSEUDO (name, name, args) + +#endif /* __ELF__ */ + +#else /* __STDC__ */ + +#define SYSCALL__(name,args) PSEUDO (__/**/name, name, args) +#define SYSCALL(name,args) PSEUDO (name, name, args) + +#endif /* __STDC__ */ + +/* Machine-dependent sysdep.h files are expected to define the macro + PSEUDO (function_name, syscall_name) to emit assembly code to define the + C-callable function FUNCTION_NAME to do system call SYSCALL_NAME. + r0 and r1 are the system call outputs. movl should be defined as + an instruction such that "movl r1, r0" works. ret should be defined + as the return instruction. */ + + +#if !defined(HAVE_GNU_LD) && !defined (__ELF__) +#define ___errno _errno +#endif + +#define HAVE_SYSCALLS |