diff options
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/mmap64.S | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/arm/mmap64.S b/sysdeps/unix/sysv/linux/arm/mmap64.S new file mode 100644 index 0000000000..604bb76137 --- /dev/null +++ b/sysdeps/unix/sysv/linux/arm/mmap64.S @@ -0,0 +1,66 @@ +/* Copyright (C) 2000 Free Software Foundation, Inc. + 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 + + /* The mmap2 system call takes six arguments, all in registers. */ + .text +ENTRY (__mmap64) +#ifdef __NR_mmap2 + stmfd sp!, {r4, r5, lr} + ldr r5, [sp, $16] + ldr r4, [sp, $12] + movs ip, r5, lsl $20 @ check that offset is page-aligned + bne .Linval + ldr ip, [sp, $20] + mov r5, r5, lsr $12 + orr r5, r5, ip, lsl $20 @ compose page offset + movs ip, ip, lsr $12 + bne .Linval @ check for overflow + mov ip, r0 + swi SYS_ify (mmap2) + cmn r0, $4096 + LOADREGS(ccfd, sp!, {r4, r5, pc}) + teq r0, $-ENOSYS + ldmnefd sp!, {r4, r5, lr} + bne PLTJMP(syscall_error) + /* The current kernel does not support mmap2. Fall back to plain + mmap if the offset is small enough. */ + ldr r5, [sp, $20] + mov r0, ip @ first arg was clobbered + teq r5, $0 + ldmeqfd sp!, {r4, r5, lr} + beq PLTJMP(__mmap) +.Linval: + mov r0, $-EINVAL + ldmfd sp!, {r4, r5, lr} + b PLTJMP(syscall_error) +#else + /* The kernel headers do not support mmap2. Fall back to plain + mmap if the offset is small enough. */ + ldr ip, [sp, $8] + teq ip, $0 + beq PLTJMP(__mmap) + mov r0, $-EINVAL + b PLTJMP(syscall_error) +#endif +PSEUDO_END (__mmap64) + +weak_alias (__mmap64, mmap64) |