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