diff options
Diffstat (limited to 'libc/sysdeps/unix/sysv/linux/s390/s390-32/mmap64.S')
-rw-r--r-- | libc/sysdeps/unix/sysv/linux/s390/s390-32/mmap64.S | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/libc/sysdeps/unix/sysv/linux/s390/s390-32/mmap64.S b/libc/sysdeps/unix/sysv/linux/s390/s390-32/mmap64.S new file mode 100644 index 000000000..aba4ac34e --- /dev/null +++ b/libc/sysdeps/unix/sysv/linux/s390/s390-32/mmap64.S @@ -0,0 +1,113 @@ +/* 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 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> + +#define EINVAL 22 +#define ENOSYS 38 + + .text +ENTRY(__mmap64) + /* Save registers and setup stack frame. */ + stm %r6,%r15,24(%r15) + cfi_offset (%r15, -36) + cfi_offset (%r14, -40) + cfi_offset (%r13, -44) + cfi_offset (%r12, -48) + cfi_offset (%r11, -52) + cfi_offset (%r10, -56) + cfi_offset (%r9, -60) + cfi_offset (%r8, -64) + cfi_offset (%r7, -68) + cfi_offset (%r6, -72) + lr %r1,%r15 + ahi %r15,-120 /* Buy stack space. */ + cfi_adjust_cfa_offset (120) + st %r1,0(%r15) /* Store back chain. */ + + /* Store parameters on stack, because mmap2 and old_mmap + * 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'. */ + +#ifdef __NR_mmap2 + lm %r0,%r1,216(%r15) /* Load 64 bit offset. */ + tml %r1,0x0fff /* Offset page aligned ? */ + jnz 2f /* No -> EINVAL. */ + srdl %r0,12 /* mmap2 takes the offset in pages. */ + ltr %r0,%r0 /* Offset > 2^44 ? */ + jnz 2f + 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. */ + +#ifndef __ASSUME_MMAP2_SYSCALL + chi %r2,-ENOSYS + je 1f +#endif + + l %r15,0(%r15) /* Load back chain. */ + cfi_adjust_cfa_offset (-120) + 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 + +#endif + +#if !defined __ASSUME_MMAP2_SYSCALL || !defined __NR_mmap2 +1: lm %r0,%r1,216(%r15) /* Load 64 bit offset. */ + st %r1,0x74(%r15) /* Store lower word of offset. */ + ltr %r0,%r0 /* Offset > 2^32 ? */ + jnz 2f + alr %r1,%r3 /* Add length to offset. */ + brc 3,2f /* Carry -> EINVAL. */ + + la %r2,0x60(%r15) /* Load address of parameter list. */ + svc SYS_ify(mmap) /* Do the system call trap. */ + + 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 +#endif + +2: lhi %r2,-EINVAL + l %r15,0(%r15) /* Load back chain. */ + lm %r6,%r15,24(%r15) /* Load registers. */ + j SYSCALL_ERROR_LABEL + +PSEUDO_END (__mmap64) + +weak_alias (__mmap64, mmap64) |