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-rw-r--r--sysdeps/unix/sysv/linux/s390/syscall.S51
1 files changed, 51 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/s390/syscall.S b/sysdeps/unix/sysv/linux/s390/syscall.S
new file mode 100644
index 0000000000..dbd8d6887c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/s390/syscall.S
@@ -0,0 +1,51 @@
+/* Copyright (C) 2000 Free Software Foundation, Inc.
+   Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
+   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., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <sysdep.h>
+
+/* Please consult the file sysdeps/unix/sysv/linux/s390/sysdep.h for
+   more information about the value -4095 used below.*/
+
+ENTRY (syscall)
+	/* Save registers and setup stack.  */
+	stm     %r6,%r15,24(%r15)  /* save registers */
+	lr      %r1,%r15
+	l       %r0,4(0,%r15)      /* load eos */
+	ahi     %r15,-96           /* buy stack space */
+	st      %r1,0(0,%r15)      /* store back chain */
+	st      %r0,4(0,%r15)      /* store eos */
+
+	lr     %r1,%r2             /* move syscall number */
+	lr     %r2,%r3             /* first parameter  */
+	lr     %r3,%r4             /* second parameter */
+	lr     %r4,%r5             /* third parameter  */
+	lr     %r5,%r6             /* fourth parameter */
+	l      %r6,192(%r15)       /* fifth parameter  */
+	basr   %r7,0
+.L0:    ex     %r1,.L1-.L0(%r7)    /* lsb of R1 is subsituted as SVC number */
+
+	l       %r15,0(0,%r15)     /* load back chain */
+	lm      %r6,15,24(%r15)    /* load registers */
+
+	lhi    %r0,-4095
+	clr    %r2,%r0             /* check R2 for error */
+	jnl    SYSCALL_ERROR_LABEL
+	br     %r14                /* return to caller */
+.L1:    .word  0x0A00              /* opcode for SVC 0 */
+PSEUDO_END (syscall)