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- /* 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 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 <features.h>
- #define _ERRNO_H
- #include <bits/errno.h>
- #include <sys/syscall.h>
- #if defined __UCLIBC_HAS_LFS__ && defined __NR_mmap2
- /* The mmap2 system call takes six arguments, all in registers. */
- .text
- .global mmap64
- .type mmap64,%function
- .align 4
- mmap64:
- 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 __NR_mmap2
- cmn r0, $4096
- ldmccfd sp!, {r4, r5, pc}
- cmn r0, $ENOSYS
- ldmnefd sp!, {r4, r5, lr}
- bne __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 __mmap
- .Linval:
- mov r0, $-EINVAL
- ldmfd sp!, {r4, r5, lr}
- b __error
- __error:
- b __syscall_error
- .size mmap64,.-mmap64
- #endif
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