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/* Copyright (C) 2001-2013 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 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
<http://www.gnu.org/licenses/>. */
#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. */
stmg %r6,%r15,48(%r15) /* Save registers. */
cfi_offset (%r15,-40)
cfi_offset (%r14,-48)
cfi_offset (%r13,-56)
cfi_offset (%r12,-64)
cfi_offset (%r11,-72)
cfi_offset (%r10,-80)
cfi_offset (%r9,-88)
cfi_offset (%r8,-96)
cfi_offset (%r7,-104)
cfi_offset (%r6,-112)
lgr %r1,%r15
lg %r0,8(%r15) /* Load eos. */
aghi %r15,-160 /* Buy stack space. */
cfi_adjust_cfa_offset (160)
stg %r1,0(%r15) /* Store back chain. */
stg %r0,8(%r15) /* Store eos. */
lgr %r1,%r2 /* Move syscall number. */
lgr %r2,%r3 /* First parameter. */
lgr %r3,%r4 /* Second parameter. */
lgr %r4,%r5 /* Third parameter. */
lgr %r5,%r6 /* Fourth parameter. */
lg %r6,320(%r15) /* Fifth parameter. */
lg %r7,328(%r15) /* Sixth parameter. */
basr %r8,0
0: clg %r1,4f-0b(%r8) /* svc number < 256? */
jl 2f
1: svc 0
j 3f
2: ex %r1,1b-0b(%r8) /* lsb of R1 is subsituted as SVC number */
3: lg %r15,0(%r15) /* load back chain */
cfi_adjust_cfa_offset (-160)
lmg %r6,15,48(%r15) /* Load registers. */
lghi %r0,-4095
clgr %r2,%r0 /* Check R2 for error. */
jgnl SYSCALL_ERROR_LABEL
br %r14 /* Return to caller. */
4: .quad 256
PSEUDO_END (syscall)
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