diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386/libc-do-syscall.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/libc-do-syscall.S | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/libc-do-syscall.S b/sysdeps/unix/sysv/linux/i386/libc-do-syscall.S new file mode 100644 index 0000000000..af5c6f05a6 --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/libc-do-syscall.S @@ -0,0 +1,50 @@ +/* Out-of-line syscall stub for six-argument syscalls from C. + Copyright (C) 2015 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> + +/* %eax, %ecx, %edx and %esi contain the values expected by the kernel. + %edi points to a structure with the values of %ebx, %edi and %ebp. */ + + .hidden __libc_do_syscall + +ENTRY (__libc_do_syscall) + pushl %ebx + cfi_adjust_cfa_offset (4) + cfi_rel_offset (ebx, 0) + pushl %edi + cfi_adjust_cfa_offset (4) + cfi_rel_offset (edi, 0) + pushl %ebp + cfi_adjust_cfa_offset (4) + cfi_rel_offset (ebp, 0) + movl 0(%edi), %ebx + movl 8(%edi), %ebp + movl 4(%edi), %edi + ENTER_KERNEL + popl %ebp + cfi_adjust_cfa_offset (-4) + cfi_restore (ebp) + popl %edi + cfi_adjust_cfa_offset (-4) + cfi_restore (edi) + popl %ebx + cfi_adjust_cfa_offset (-4) + cfi_restore (ebx) + ret +END (__libc_do_syscall) |