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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.  */

#define _ERRNO_H        1
#include <features.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     __syscall_error (PLT)
        /* 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 (PLT)
.Linval:
        mov     r0, $-EINVAL
        ldmfd   sp!, {r4, r5, lr}
        b       __syscall_error (PLT)

__syscall_error:
        /* Looks like the syscall choked -- set errno */
        ldr  r3, .L4
        /* Calculate the - of the syscall result, in case we need it */
        rsb  r2, r0, $0

        /* errno = -result */
        str  r2, [r9,r3]

        /* return -1 */
        mvn  r0, $0
        mov  pc, lr
.size mmap64,.-mmap64;

.L4:  .word errno

#endif