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81 lines
2.2 KiB
ArmAsm
81 lines
2.2 KiB
ArmAsm
/* Copyright (C) 2000, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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#define EINVAL 22
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#define ENOSYS 38
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#include "kernel-features.h"
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/* The mmap2 system call takes six arguments, all in registers. */
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.text
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ENTRY (__mmap64)
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#ifdef __NR_mmap2
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ldr ip, [sp, $4] @ offset low part
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str r5, [sp, #-4]!
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ldr r5, [sp, $12] @ offset high part
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str r4, [sp, #-4]!
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movs r4, ip, lsl $20 @ check that offset is page-aligned
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mov ip, ip, lsr $12
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moveqs r4, r5, lsr $12 @ check for overflow
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bne .Linval
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ldr r4, [sp, $8] @ load fd
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orr r5, ip, r5, lsl $20 @ compose page offset
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mov ip, r0
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swi SYS_ify (mmap2)
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cmn r0, $4096
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# ifdef __ASSUME_MMAP2_SYSCALL
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ldr r4, [sp], #4
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ldr r5, [sp], #4
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RETINSTR(movcc, pc, lr)
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b PLTJMP(syscall_error)
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# else
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ldrcc r4, [sp], #4
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ldrcc r5, [sp], #4
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RETINSTR(movcc, pc, lr)
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cmn r0, $ENOSYS
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bne .Lerror
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/* The current kernel does not support mmap2. Fall back to plain
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mmap if the offset is small enough. */
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ldr r5, [sp, $16]
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mov r0, ip @ first arg was clobbered
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teq r5, $0
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ldreq r4, [sp], #4
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ldreq r5, [sp], #4
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beq PLTJMP(__mmap)
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# endif
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.Linval:
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mov r0, $-EINVAL
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.Lerror:
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ldr r4, [sp], #4
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ldr r5, [sp], #4
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b PLTJMP(syscall_error)
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#else
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/* The kernel headers do not support mmap2. Fall back to plain
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mmap if the offset is small enough. */
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ldr ip, [sp, $8]
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teq ip, $0
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beq PLTJMP(__mmap)
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mov r0, $-EINVAL
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b PLTJMP(syscall_error)
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#endif
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PSEUDO_END (__mmap64)
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weak_alias (__mmap64, mmap64)
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