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29b3c4f2ad
* sysdeps/unix/sysv/linux/i386/mmap64.S: Handle unaligned offsets. * sysdeps/unix/sysv/linux/i386/mmap.S: Likewise.
89 lines
2.1 KiB
ArmAsm
89 lines
2.1 KiB
ArmAsm
/* Copyright (C) 1995, 96, 97, 98, 99, 2000 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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#include "kernel-features.h"
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#define EINVAL 22
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.text
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ENTRY (__mmap)
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/* I don't think it is worthwhile trzing to use mmap2 whenever it
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is available. Only use it when we are sure the syscall exists. */
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#ifdef __ASSUME_MMAP2_SYSCALL
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/* Save registers. */
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pushl %ebp
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pushl %ebx
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pushl %esi
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pushl %edi
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movl 20(%esp), %ebx
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movl 24(%esp), %ecx
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movl 28(%esp), %edx
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movl 32(%esp), %esi
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movl 36(%esp), %edi
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movl 40(%esp), %ebp
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testl $0x3ff, %ebp
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movl $-EINVAL, %eax
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jne L(skip)
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shrl $12, %ebp /* mmap2 takes the offset in pages. */
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movl $SYS_ify(mmap2), %eax /* System call number in %eax. */
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/* Do the system call trap. */
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int $0x80
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L(skip):
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/* Restore registers. */
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popl %edi
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popl %esi
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popl %ebx
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popl %ebp
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#else
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/* Save registers. */
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movl %ebx, %edx
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movl $SYS_ify(mmap), %eax /* System call number in %eax. */
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lea 4(%esp), %ebx /* Address of args is 1st arg. */
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/* Do the system call trap. */
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int $0x80
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/* Restore registers. */
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movl %edx, %ebx
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#endif
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/* If 0 > %eax > -4096 there was an error. */
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cmpl $-4096, %eax
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ja SYSCALL_ERROR_LABEL
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/* Successful; return the syscall's value. */
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L(pseudo_end):
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ret
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PSEUDO_END (__mmap)
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weak_alias (__mmap, mmap)
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