linux: Add generic syscall implementation

It allows also to remove hppa specific implementation and simplify
riscv implementation a bit.

1 files changed, 43 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/syscall.c b/sysdeps/unix/sysv/linux/syscall.c
new file mode 100644
index 0000000000..5d87428756
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/syscall.c
@@ -0,0 +1,43 @@
+/* Indirect system call.  Linux generic implementation.
+   Copyright (C) 1997-2021 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <stdarg.h>
+#include <sysdep.h>
+
+long int
+syscall (long int number, ...)
+{
+  va_list args;
+
+  va_start (args, number);
+  long int a0 = va_arg (args, long int);
+  long int a1 = va_arg (args, long int);
+  long int a2 = va_arg (args, long int);
+  long int a3 = va_arg (args, long int);
+  long int a4 = va_arg (args, long int);
+  long int a5 = va_arg (args, long int);
+  va_end (args);
+
+  int r = INTERNAL_SYSCALL_NCS_CALL (number, a0, a1, a2, a3, a4, a5);
+  if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (r)))
+    {
+      __set_errno (-r);
+      return -1;
+    }
+  return r;
+}