| 1 | /* Out-of-line syscall stub for six-argument syscalls from C. |
|---|---|
| 2 | Copyright (C) 2015-2024 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <sysdep.h> |
| 20 | |
| 21 | /* %eax, %ecx, %edx and %esi contain the values expected by the kernel. |
| 22 | %edi points to a structure with the values of %ebx, %edi and %ebp. */ |
| 23 | |
| 24 | .hidden __libc_do_syscall |
| 25 | |
| 26 | ENTRY (__libc_do_syscall) |
| 27 | pushl %ebx |
| 28 | cfi_adjust_cfa_offset (4) |
| 29 | cfi_rel_offset (ebx, 0) |
| 30 | pushl %edi |
| 31 | cfi_adjust_cfa_offset (4) |
| 32 | cfi_rel_offset (edi, 0) |
| 33 | pushl %ebp |
| 34 | cfi_adjust_cfa_offset (4) |
| 35 | cfi_rel_offset (ebp, 0) |
| 36 | movl 0(%edi), %ebx |
| 37 | movl 8(%edi), %ebp |
| 38 | movl 4(%edi), %edi |
| 39 | ENTER_KERNEL |
| 40 | popl %ebp |
| 41 | cfi_adjust_cfa_offset (-4) |
| 42 | cfi_restore (ebp) |
| 43 | popl %edi |
| 44 | cfi_adjust_cfa_offset (-4) |
| 45 | cfi_restore (edi) |
| 46 | popl %ebx |
| 47 | cfi_adjust_cfa_offset (-4) |
| 48 | cfi_restore (ebx) |
| 49 | ret |
| 50 | END (__libc_do_syscall) |
| 51 |