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/* Copyright (C) 1995, 96, 97, 98, 99, 2000 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <sysdep.h>
#include <bp-sym.h>
#include <bp-asm.h>
#include "kernel-features.h"
#define EINVAL 22
#define ENOSYS 38
#define SVRSP 16 /* saved register space */
#define PARMS LINKAGE+SVRSP /* space for 4 saved regs */
#define ADDR PARMS
#define LEN ADDR+PTR_SIZE
#define PROT LEN+4
#define FLAGS PROT+4
#define FD FLAGS+4
#define OFFLO FD+4
#define OFFHI OFFLO+4
.text
ENTRY (BP_SYM (__mmap64))
#ifdef __NR_mmap2
/* Save registers. */
pushl %ebp
pushl %ebx
pushl %esi
pushl %edi
movl OFFLO(%esp), %edx
movl OFFHI(%esp), %ecx
testl $0xfff, %edx
jne L(einval)
shrdl $12, %ecx, %edx /* mmap2 takes the offset in pages. */
shrl $12, %ecx
jne L(einval)
movl %edx, %ebp
movl ADDR(%esp), %ebx
movl LEN(%esp), %ecx
movl PROT(%esp), %edx
movl FLAGS(%esp), %esi
movl FD(%esp), %edi
movl $SYS_ify(mmap2), %eax /* System call number in %eax. */
/* Do the system call trap. */
L(do_syscall):
int $0x80
/* Restore registers. */
popl %edi
popl %esi
popl %ebx
popl %ebp
#ifndef __ASSUME_MMAP2_SYSCALL
2:
cmp $-ENOSYS, %eax
je 3f
#endif
/* If 0 > %eax > -4096 there was an error. */
cmpl $-4096, %eax
ja SYSCALL_ERROR_LABEL
/* Successful; return the syscall's value. */
L(pseudo_end):
ret
/* This means the offset value is too large. */
L(einval):
popl %edi
popl %esi
popl %ebx
popl %ebp
movl $-EINVAL, %eax
jmp SYSCALL_ERROR_LABEL
#endif
#if !defined __ASSUME_MMAP2_SYSCALL || !defined __NR_mmap2
3:
/* Save registers. */
movl %ebx, %edx
cmpl $0, OFFHI-SVRSP(%esp)
jne L(einval2)
movl $SYS_ify(mmap), %eax /* System call number in %eax. */
lea ADDR-SVRSP(%esp), %ebx /* Address of args is 1st arg. */
/* Do the system call trap. */
int $0x80
/* Restore registers. */
movl %edx, %ebx
/* If 0 > %eax > -4096 there was an error. */
cmpl $-4096, %eax
ja SYSCALL_ERROR_LABEL
/* Successful; return the syscall's value. */
#ifndef __NR_mmap2
L(pseudo_end):
#endif
ret
L(einval2):
movl %edx, %ebx
movl $-EINVAL, %eax
jmp SYSCALL_ERROR_LABEL
#endif
PSEUDO_END (BP_SYM (__mmap64))
weak_alias (BP_SYM (__mmap64), BP_SYM (mmap64))
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