diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386/mmap64.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/mmap64.S | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/mmap64.S b/sysdeps/unix/sysv/linux/i386/mmap64.S new file mode 100644 index 0000000000..075c3f3345 --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/mmap64.S @@ -0,0 +1,125 @@ +/* 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> + +#include "kernel-features.h" + +#define EINVAL 22 + + .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), %ebp + movl 44(%esp), %ecx + shrld $12, %ecx, %ebp /* mmap2 takes the offset in pages. */ + shrl $12, %ecx + jne L(einval) + + 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_syscal): + 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 + +#ifndef __ASSUME_MMAP2_SYSCALL +2: + cmp $-EINVAL, %eax + je 2f +#endif + + /* 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 + +# ifndef __NR_mmap2 + /* Save registers. */ + movl %ebx, %edx +# endif + + 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) |