diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/s390/s390-64/syscall.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/s390/s390-64/syscall.S | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/syscall.S b/sysdeps/unix/sysv/linux/s390/s390-64/syscall.S new file mode 100644 index 0000000000..b632ced19a --- /dev/null +++ b/sysdeps/unix/sysv/linux/s390/s390-64/syscall.S @@ -0,0 +1,52 @@ +/* Copyright (C) 2001 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. */ + stmg %r6,%r15,48(%r15) /* Save registers. */ + lgr %r1,%r15 + lg %r0,8(%r15) /* Load eos. */ + aghi %r15,-160 /* Buy stack space. */ + 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. */ + basr %r7,0 +.L0: ex %r1,.L1-.L0(%r7) /* Lsb of R1 is subsituted as SVC number. */ + + lg %r15,0(%r15) /* Load back chain. */ + lmg %r6,15,48(%r15) /* Load registers. */ + + lghi %r0,-4095 + clgr %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) + |