| /* Copyright (C) 1995,96,97,98,99,2000,2002,2005,2006 |
| 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 Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; 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 (__mmap) |
| |
| /* I don't think it is worthwhile trying 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 |
| cfi_adjust_cfa_offset (4) |
| pushl %ebx |
| cfi_adjust_cfa_offset (4) |
| pushl %esi |
| cfi_adjust_cfa_offset (4) |
| pushl %edi |
| cfi_adjust_cfa_offset (4) |
| |
| movl 20(%esp), %ebx |
| cfi_rel_offset (ebx, 8) |
| movl 24(%esp), %ecx |
| movl 28(%esp), %edx |
| movl 32(%esp), %esi |
| cfi_rel_offset (esi, 4) |
| movl 36(%esp), %edi |
| cfi_rel_offset (edi, 0) |
| movl 40(%esp), %ebp |
| cfi_rel_offset (ebp, 12) |
| testl $0xfff, %ebp |
| movl $-EINVAL, %eax |
| jne L(skip) |
| shrl $12, %ebp /* mmap2 takes the offset in pages. */ |
| |
| movl $SYS_ify(mmap2), %eax /* System call number in %eax. */ |
| |
| /* Do the system call trap. */ |
| ENTER_KERNEL |
| L(skip): |
| /* Restore registers. */ |
| popl %edi |
| cfi_adjust_cfa_offset (-4) |
| cfi_restore (edi) |
| popl %esi |
| cfi_adjust_cfa_offset (-4) |
| cfi_restore (esi) |
| popl %ebx |
| cfi_adjust_cfa_offset (-4) |
| cfi_restore (ebx) |
| popl %ebp |
| cfi_adjust_cfa_offset (-4) |
| cfi_restore (ebp) |
| |
| #else |
| |
| /* Save registers. */ |
| movl %ebx, %edx |
| cfi_register (ebx, edx) |
| |
| movl $SYS_ify(mmap), %eax /* System call number in %eax. */ |
| |
| lea 4(%esp), %ebx /* Address of args is 1st arg. */ |
| |
| /* Do the system call trap. */ |
| int $0x80 |
| |
| /* Restore registers. */ |
| movl %edx, %ebx |
| cfi_restore (ebx) |
| |
| #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 |
| |
| PSEUDO_END (__mmap) |
| |
| weak_alias (__mmap, mmap) |
