diff options
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/tile/tilegx/ioctl.S')
| -rw-r--r-- | ports/sysdeps/unix/sysv/linux/tile/tilegx/ioctl.S | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/tile/tilegx/ioctl.S b/ports/sysdeps/unix/sysv/linux/tile/tilegx/ioctl.S new file mode 100644 index 0000000000..e966c4d891 --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/tile/tilegx/ioctl.S @@ -0,0 +1,41 @@ +/* Copyright (C) 2011 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. + + 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/>. */ + + +/* TILE-Gx specifies that "unsigned int" is sign extended in the high + 32 bits. But since the userspace API claims to be "unsigned long", + calls into __ioctl() will not be sign extended, but rather pass all + 64 bits of the argument. Therefore, when we pass the "request" + value to the kernel, we must explicitly sign-extend it to match the + kernel's internal use of "unsigned int" as the second argument, + which we do by casting to "unsigned int". */ + +#include <sysdep.h> + + .text +ENTRY (__ioctl) + FEEDBACK_ENTER(__ioctl) + { + addxi r1, r1, 0 + moveli TREG_SYSCALL_NR_NAME, __NR_ioctl + } + swint1 + BNEZ r1, 0f + jrp lr +PSEUDO_END (__ioctl) +weak_alias (__ioctl, ioctl) |