diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/arm/mmap64.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/mmap64.S | 80 |
1 files changed, 80 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..b4b712c2f2 --- /dev/null +++ b/sysdeps/unix/sysv/linux/arm/mmap64.S @@ -0,0 +1,80 @@ +/* Copyright (C) 2000, 2003 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 <sysdep.h> + +#define EINVAL 22 +#define ENOSYS 38 + +#include "kernel-features.h" + + /* The mmap2 system call takes six arguments, all in registers. */ + .text +ENTRY (__mmap64) +#ifdef __NR_mmap2 + ldr ip, [sp, $4] @ offset low part + str r5, [sp, #-4]! + ldr r5, [sp, $12] @ offset high part + str r4, [sp, #-4]! + movs r4, ip, lsl $20 @ check that offset is page-aligned + mov ip, ip, lsr $12 + moveqs r4, r5, lsr $12 @ check for overflow + bne .Linval + ldr r4, [sp, $8] @ load fd + orr r5, ip, r5, lsl $20 @ compose page offset + mov ip, r0 + swi SYS_ify (mmap2) + cmn r0, $4096 +# ifdef __ASSUME_MMAP2_SYSCALL + ldr r4, [sp], #4 + ldr r5, [sp], #4 + RETINSTR(cc, lr) + b PLTJMP(syscall_error) +# else + ldrcc r4, [sp], #4 + ldrcc r5, [sp], #4 + RETINSTR(cc, lr) + cmn r0, $ENOSYS + bne .Lerror + /* The current kernel does not support mmap2. Fall back to plain + mmap if the offset is small enough. */ + ldr r5, [sp, $16] + mov r0, ip @ first arg was clobbered + teq r5, $0 + ldreq r4, [sp], #4 + ldreq r5, [sp], #4 + beq PLTJMP(__mmap) +# endif +.Linval: + mov r0, $-EINVAL +.Lerror: + ldr r4, [sp], #4 + ldr r5, [sp], #4 + 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) |