From: Ulrich Drepper <drepper@redhat.com>
Date: Mon, 27 Dec 1999 06:49:22 +0000 (+0000)
Subject: Linux/i386 implementation of mmap64.
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=677d2e0f802f6fa769053cee72794a1af8ef03e9;p=thirdparty%2Fglibc.git

Linux/i386 implementation of mmap64.
---

diff --git a/sysdeps/unix/sysv/linux/i386/mmap64.S b/sysdeps/unix/sysv/linux/i386/mmap64.S
new file mode 100644
index 00000000000..f30407f0050
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/i386/mmap64.S
@@ -0,0 +1,123 @@
+/* Copyright (C) 1995, 1996, 1997, 1998, 1999 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>
+
+#define EINVAL	22
+#define ENOSYS	38
+
+	.text
+
+ENTRY (__mmap64)
+
+#ifdef __NR_mmap2
+
+	/* Save registers.  */
+	pushl %ebp
+	pushl %ebx
+	pushl %esi
+	pushl %edi
+
+	movl $SYS_ify(mmap2), %eax	/* System call number in %eax.  */
+
+	movl 40(%esp), %edx
+	movl 44(%esp), %ecx
+	shrdl $12, %ecx, %edx		/* mmap2 takes the offset in pages.  */
+	shrl $12, %ecx
+	jne L(einval)
+	movl %edx, %ebp
+
+	movl 20(%esp), %ebx
+	movl 24(%esp), %ecx
+	movl 28(%esp), %edx
+	movl 32(%esp), %esi
+	movl 36(%esp), %edi
+
+	/* Do the system call trap.  */
+L(do_syscall):
+	int $0x80
+
+	/* If 0 > %eax > -4096 there was an error.  */
+	cmpl $-4096, %eax
+	ja SYSCALL_ERROR_LABEL
+
+	/* Restore registers.  */
+	popl %edi
+	popl %esi
+	popl %ebx
+	popl %ebp
+
+	/* Successful; return the syscall's value.  */
+L(pseudo_end):
+	ret
+
+2:
+	cmp $-ENOSYS, %eax
+	je 3f
+
+	/* 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 __NR_mmap2
+
+# ifndef __NR_mmap2
+	/* Save registers.  */
+	movl %ebx, %edx
+# endif
+3:
+	cmpl $0, 44(%esp)
+	jne L(einval)
+
+	movl $SYS_ify(mmap), %eax	/* System call number in %eax.  */
+
+	lea 4(%esp), %ebx		/* Address of args is 1st arg.  */
+
+# ifdef __NR_mmap2
+	jmp L(do_syscall)
+# else
+
+	/* 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.  */
+L(pseudo_end):
+	ret
+
+L(einval):
+	movl $-EINVAL, %eax
+	jmp SYSCALL_ERROR_LABEL
+# endif
+#endif
+
+PSEUDO_END (__mmap64)
+
+weak_alias (__mmap64, mmap64)