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105 lines
2.4 KiB
ArmAsm
105 lines
2.4 KiB
ArmAsm
/* Copyright (C) 1995-2012 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, see
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<http://www.gnu.org/licenses/>. */
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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 trying 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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cfi_adjust_cfa_offset (4)
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pushl %ebx
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cfi_adjust_cfa_offset (4)
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pushl %esi
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cfi_adjust_cfa_offset (4)
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pushl %edi
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cfi_adjust_cfa_offset (4)
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movl 20(%esp), %ebx
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cfi_rel_offset (ebx, 8)
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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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cfi_rel_offset (esi, 4)
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movl 36(%esp), %edi
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cfi_rel_offset (edi, 0)
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movl 40(%esp), %ebp
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cfi_rel_offset (ebp, 12)
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testl $0xfff, %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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ENTER_KERNEL
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L(skip):
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/* Restore registers. */
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popl %edi
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cfi_adjust_cfa_offset (-4)
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cfi_restore (edi)
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popl %esi
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cfi_adjust_cfa_offset (-4)
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cfi_restore (esi)
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popl %ebx
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cfi_adjust_cfa_offset (-4)
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cfi_restore (ebx)
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popl %ebp
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cfi_adjust_cfa_offset (-4)
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cfi_restore (ebp)
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#else
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/* Save registers. */
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movl %ebx, %edx
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cfi_register (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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cfi_restore (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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ret
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PSEUDO_END (__mmap)
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weak_alias (__mmap, mmap)
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