linux-stable/arch/powerpc/kernel/systbl_chk.c
Michael Ellerman 454d7ef81a powerpc/syscalls: Add COMPAT_SPU_NEW() macro
Currently the select system call is wired up with the SYSX_SPU()
macro. The SYSX_SPU() is not handled by systbl_chk.c, which means the
syscall number for select is not checked.

That hides the fact that the syscall number for select is actually
__NR__newselect not __NR_select.

In a following patch we'd like to drop ppc32_select() which means
select will become a regular COMPAT_SYS_SPU() syscall. But
COMPAT_SYS_SPU() can't deal with the fact that the syscall number is
actually __NR__newselect. We also can't just redefine __NR_select
because that's still used for the old select call.

So add a new COMPAT_NEW_SPU() that does the same thing as
COMPAT_SYS_SPU() except it encodes that we're using the new number.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-05-10 23:25:14 +10:00

60 lines
1.8 KiB
C

/*
* This file, when run through CPP produces a list of syscall numbers
* in the order of systbl.h. That way we can check for gaps and syscalls
* that are out of order.
*
* Unfortunately, we cannot check for the correct ordering of entries
* using SYSX().
*
* Copyright © IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <asm/unistd.h>
#define SYSCALL(func) __NR_##func
#define COMPAT_SYS(func) __NR_##func
#define PPC_SYS(func) __NR_##func
#ifdef CONFIG_PPC64
#define OLDSYS(func) -1
#define SYS32ONLY(func) -1
#define PPC64ONLY(func) __NR_##func
#else
#define OLDSYS(func) __NR_old##func
#define SYS32ONLY(func) __NR_##func
#define PPC64ONLY(func) -1
#endif
#define SYSX(f, f3264, f32) -1
#define SYSCALL_SPU(func) SYSCALL(func)
#define COMPAT_SYS_SPU(func) COMPAT_SYS(func)
#define COMPAT_SPU_NEW(func) COMPAT_SYS(_new##func)
#define SYSX_SPU(f, f3264, f32) SYSX(f, f3264, f32)
/* Just insert a marker for ni_syscalls */
#define __NR_ni_syscall -1
/*
* These are the known exceptions.
* Hopefully, there will be no more.
*/
#define __NR_llseek __NR__llseek
#undef __NR_umount
#define __NR_umount __NR_umount2
#define __NR_old_getrlimit __NR_getrlimit
#define __NR_newstat __NR_stat
#define __NR_newlstat __NR_lstat
#define __NR_newfstat __NR_fstat
#define __NR_newuname __NR_uname
#define __NR_sysctl __NR__sysctl
#define __NR_olddebug_setcontext __NR_sys_debug_setcontext
/* We call sys_ugetrlimit for syscall number __NR_getrlimit */
#define getrlimit ugetrlimit
START_TABLE
#include <asm/systbl.h>
END_TABLE NR_syscalls