diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/s390/s390-32/mmap.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/s390/s390-32/mmap.S | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/mmap.S b/sysdeps/unix/sysv/linux/s390/s390-32/mmap.S new file mode 100644 index 0000000000..f101408bf5 --- /dev/null +++ b/sysdeps/unix/sysv/linux/s390/s390-32/mmap.S @@ -0,0 +1,72 @@ +/* Copyright (C) 2000, 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> + +#define EINVAL 22 + + .text +ENTRY(__mmap) + /* Save registers and setup stack frame. */ + stm %r6,%r15,24(%r15) + lr %r1,%r15 + ahi %r15,-120 /* buy stack space */ + st %r1,0(%r15) /* store back chain */ + + /* Store parameters on stack, because old_mmap/mmap2 + * take only one parameter: a pointer to the parameter area + */ + st %r6,0x70(%r15) /* Store 'fd'. */ + st %r5,0x6C(%r15) /* Store 'flags'. */ + st %r4,0x68(%r15) /* Store 'prot'. */ + st %r3,0x64(%r15) /* Store 'length'. */ + st %r2,0x60(%r15) /* Store 'start'. */ + l %r1,216(%r15) /* Load offset. */ + +#ifdef __ASSUME_MMAP2_SYSCALL + /* I don't think it is worthwhile trying to use mmap2 whenever + * it is available. Only use it when we are sure the syscall + * exists. */ + tml %r1,0x0fff /* Offset page aligned ? */ + lhi %r2,-EINVAL + jnz 1f /* No -> EINVAL. */ + srl %r1,12 /* mmap2 takes the offset in pages. */ + st %r1,0x74(%r15) /* Store page offset. */ + la %r2,0x60(%r15) /* Load address of parameter list. */ + svc SYS_ify(mmap2) /* Do the system call trap. */ +#else + st %r1,0x74(%r15) /* Store offset unmodified. */ + la %r2,0x60(%r15) /* Load address of parameter list. */ + svc SYS_ify(mmap) /* Do the system call trap. */ +#endif + +1: l %r15,0(%r15) /* Load back chain. */ + lm %r6,%r15,24(%r15) /* Load registers. */ + + /* check gpr 2 for error */ + lhi %r0,-4096 + clr %r2,%r0 + jnl SYSCALL_ERROR_LABEL + + /* Successful; return the syscall's value. */ + br %r14 + +PSEUDO_END (__mmap) + +weak_alias (__mmap, mmap) |