diff options
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/arm/mmap64.S')
| -rw-r--r-- | ports/sysdeps/unix/sysv/linux/arm/mmap64.S | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/arm/mmap64.S b/ports/sysdeps/unix/sysv/linux/arm/mmap64.S new file mode 100644 index 0000000000..be4dd52de4 --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/arm/mmap64.S @@ -0,0 +1,68 @@ +/* Copyright (C) 2000, 2003, 2005, 2009 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, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> + +#define EINVAL 22 + +#ifdef __ARMEB__ +# define LOW_OFFSET 8 + 4 +/* The initial + 4 is for the stack postdecrement. */ +# define HIGH_OFFSET 4 + 8 + 0 +#else +# define LOW_OFFSET 8 + 0 +# define HIGH_OFFSET 4 + 8 + 4 +#endif + + /* The mmap2 system call takes six arguments, all in registers. */ + .text +ENTRY (__mmap64) + ldr ip, [sp, $LOW_OFFSET] + str r5, [sp, #-4]! + cfi_adjust_cfa_offset (4) + cfi_rel_offset (r5, 0) + ldr r5, [sp, $HIGH_OFFSET] + str r4, [sp, #-4]! + cfi_adjust_cfa_offset (4) + cfi_rel_offset (r4, 0) + cfi_remember_state + 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 + DO_CALL (mmap2, 0) + cmn r0, $4096 + ldmfd sp!, {r4, r5} + cfi_adjust_cfa_offset (-8) + cfi_restore (r4) + cfi_restore (r5) + RETINSTR(cc, lr) + b PLTJMP(syscall_error) + + cfi_restore_state +.Linval: + mov r0, $-EINVAL + ldmfd sp!, {r4, r5} + cfi_adjust_cfa_offset (-8) + cfi_restore (r4) + cfi_restore (r5) + b PLTJMP(syscall_error) +PSEUDO_END (__mmap64) + +weak_alias (__mmap64, mmap64) |