Linux/Arm mmap64 implementation.

diff --git a/sysdeps/unix/sysv/linux/arm/mmap64.S b/sysdeps/unix/sysv/linux/arm/mmap64.S
new file mode 100644 (file)
index 0000000..604bb76
--- /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)