diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386/mmap.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/mmap.S | 40 |
1 files changed, 38 insertions, 2 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/mmap.S b/sysdeps/unix/sysv/linux/i386/mmap.S index a9929c8be1..0397f841f1 100644 --- a/sysdeps/unix/sysv/linux/i386/mmap.S +++ b/sysdeps/unix/sysv/linux/i386/mmap.S @@ -1,4 +1,4 @@ -/* Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc. +/* 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 @@ -18,10 +18,45 @@ #include <sysdep.h> +#include "kernel-features.h" + +#define EINVAL 22 + .text ENTRY (__mmap) +/* I don't think it is worthwhile trzing to use mmap2 whenever it + is available. Only use it when we are sure the syscall exists. */ +#ifdef __ASSUME_MMAP2_SYSCALL + + /* Save registers. */ + pushl %ebp + pushl %ebx + pushl %esi + pushl %edi + + movl $SYS_ify(mmap2), %eax /* System call number in %eax. */ + + movl 20(%esp), %ebx + movl 24(%esp), %ecx + movl 28(%esp), %edx + movl 32(%esp), %esi + movl 36(%esp), %edi + movl 40(%esp), %ebp + shrl $12, %ebp /* mmap2 takes the offset in pages. */ + + /* Do the system call trap. */ + int $0x80 + + /* Restore registers. */ + popl %edi + popl %esi + popl %ebx + popl %ebp + +#else + /* Save registers. */ movl %ebx, %edx @@ -35,6 +70,8 @@ ENTRY (__mmap) /* Restore registers. */ movl %edx, %ebx +#endif + /* If 0 > %eax > -4096 there was an error. */ cmpl $-4096, %eax ja SYSCALL_ERROR_LABEL @@ -46,4 +83,3 @@ L(pseudo_end): PSEUDO_END (__mmap) weak_alias (__mmap, mmap) -weak_alias (__mmap, mmap64) |