diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/s390/syscall.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/s390/syscall.S | 51 |
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) |