| /* Copyright (C) 1995-2014 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| |
| #include <kernel-features.h> |
| |
| #define EINVAL 22 |
| #define ENOSYS 38 |
| |
| #define SVRSP 16 /* saved register space */ |
| #define PARMS 4+SVRSP /* space for 4 saved regs */ |
| #define ADDR PARMS |
| #define LEN ADDR+4 |
| #define PROT LEN+4 |
| #define FLAGS PROT+4 |
| #define FD FLAGS+4 |
| #define OFFLO FD+4 |
| #define OFFHI OFFLO+4 |
| |
| .text |
| ENTRY (__mmap64) |
| |
| /* 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 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 |
| cfi_rel_offset (ebp, 12) |
| |
| movl ADDR(%esp), %ebx |
| cfi_rel_offset (ebx, 8) |
| movl LEN(%esp), %ecx |
| movl PROT(%esp), %edx |
| movl FLAGS(%esp), %esi |
| cfi_rel_offset (esi, 4) |
| movl FD(%esp), %edi |
| cfi_rel_offset (edi, 0) |
| |
| movl $SYS_ify(mmap2), %eax /* System call number in %eax. */ |
| |
| /* Do the system call trap. */ |
| L(do_syscall): |
| ENTER_KERNEL |
| |
| /* 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) |
| |
| /* If 0 > %eax > -4096 there was an error. */ |
| cmpl $-4096, %eax |
| ja SYSCALL_ERROR_LABEL |
| |
| /* Successful; return the syscall's value. */ |
| ret |
| |
| cfi_adjust_cfa_offset (16) |
| cfi_rel_offset (ebp, 12) |
| cfi_rel_offset (ebx, 8) |
| cfi_rel_offset (esi, 4) |
| cfi_rel_offset (edi, 0) |
| /* This means the offset value is too large. */ |
| L(einval): |
| 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) |
| movl $-EINVAL, %eax |
| jmp SYSCALL_ERROR_LABEL |
| |
| PSEUDO_END (__mmap64) |
| |
| weak_alias (__mmap64, mmap64) |
