1 /* Copyright (C) 2000-2013 Free Software Foundation, Inc.
2 Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
21 /* Please consult the file sysdeps/unix/sysv/linux/s390/sysdep.h for
22 more information about the value -4095 used below.*/
25 /* Save registers and setup stack. */
26 stm %r6,%r15,24(%r15) /* save registers */
27 cfi_offset (%r15, -36)
28 cfi_offset (%r14, -40)
29 cfi_offset (%r13, -44)
30 cfi_offset (%r12, -48)
31 cfi_offset (%r11, -52)
32 cfi_offset (%r10, -56)
38 l %r0,4(0,%r15) /* load eos */
39 ahi %r15,-96 /* buy stack space */
40 cfi_adjust_cfa_offset (96)
41 st %r1,0(0,%r15) /* store back chain */
42 st %r0,4(0,%r15) /* store eos */
44 lr %r1,%r2 /* move syscall number */
45 lr %r2,%r3 /* first parameter */
46 lr %r3,%r4 /* second parameter */
47 lr %r4,%r5 /* third parameter */
48 lr %r5,%r6 /* fourth parameter */
49 l %r6,192(%r15) /* fifth parameter */
50 l %r7,196(%r15) /* sixth parameter */
53 0: cl %r1,4f-0b(%r8) /* svc number < 256? */
57 2: ex %r1,1b-0b(%r8) /* lsb of R1 is subsituted as SVC number */
58 3: l %r15,0(%r15) /* load back chain */
59 cfi_adjust_cfa_offset (-96)
60 lm %r6,15,24(%r15) /* load registers */
63 clr %r2,%r0 /* check R2 for error */
64 jnl SYSCALL_ERROR_LABEL
65 br %r14 /* return to caller */