Re: [PATCH 08/11] nds32: Linux ABI

[Vincent Chen <vincentc@andestech.com>]

On Wed, May 09, 2018 at 05:18:41AM +0800, Adhemerval Zanella wrote:
> 
> 
> On 06/05/2018 11:41, vincentc wrote:
> > diff --git a/sysdeps/unix/sysv/linux/nds32/ipc_priv.h b/sysdeps/unix/sysv/linux/nds32/ipc_priv.h
> > new file mode 100644
> > index 0000000..e0732b9
> > --- /dev/null
> > +++ b/sysdeps/unix/sysv/linux/nds32/ipc_priv.h
> > @@ -0,0 +1,22 @@
> > +/* Old SysV permission definition for Linux, Andes nds32 version.
> > +   Copyright (C) 2018 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 <sys/ipc.h>  /* For __key_t.  */
> > +
> > +#define __IPC_64	0x0
> > +
> 
> My understanding was generic uapi for Linux expects IPC_64 being 0x100 for
> newer ports, but seems for recent ones that 0x0 is the expect values.  Is
> the case or NDS32 is a outlier? 
>


For new ports of Linux, only new IPC version is supported. Therefore, kernel
does not identify the IPC version by __IPC_64 flag. Unfortunately, kernel also 
skip the code for removing __IPC_64 flag from cmd. Therefore, -EINVAL is returned
if __IPC_64 is set. To solve this problem, we set __IPC_64 as 0x0 instead of
0x100.

 
> > diff --git a/sysdeps/unix/sysv/linux/nds32/kernel_sigaction.h b/sysdeps/unix/sysv/linux/nds32/kernel_sigaction.h
> > new file mode 100644
> > index 0000000..d7fab19
> > --- /dev/null
> > +++ b/sysdeps/unix/sysv/linux/nds32/kernel_sigaction.h
> > @@ -0,0 +1,30 @@
> > +/* Define struct old_kernel_sigaction and kernel_sigaction for Andes nds32.
> > +   Copyright (C) 2006-2018 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/>.  */
> > +
> > +
> > +struct old_kernel_sigaction {
> > +	__sighandler_t k_sa_handler;
> > +	unsigned long sa_mask;
> > +	unsigned long sa_flags;
> > +};
> > +
> > +struct kernel_sigaction {
> > +	__sighandler_t k_sa_handler;
> > +	unsigned long sa_flags;
> > +	sigset_t sa_mask;
> > +};
> 
> The 'old_kernel_sigaction' is not used anywhere in glibc code and after
> sigaction consolidation (b4a5d26d8835d972995f0a0a2f805a8845bafa0b) the
> generic Linux kernel_sigactions.h should follow generic uapi.  It seems
> NDS32 follows this case, so are you sure you need a arch-specific
> version?

OK, we will remove it in the next version.

Thanks for your suggestions.

Best regards
Vincent Chen