forked from luck/tmp_suning_uos_patched
5cacdb4add
Add generic implementations of the old and really old uname system calls. Note that sh only implements sys_olduname but not sys_oldolduname, but I'm not going to bother with another ifdef for that special case. m32r implemented an old uname but never wired it up, so kill it, too. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: James Morris <jmorris@namei.org> Cc: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
/*
|
|
* linux/arch/m32r/kernel/sys_m32r.c
|
|
*
|
|
* This file contains various random system calls that
|
|
* have a non-standard calling sequence on the Linux/M32R platform.
|
|
*
|
|
* Taken from i386 version.
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/sem.h>
|
|
#include <linux/msg.h>
|
|
#include <linux/shm.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/file.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/ipc.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/cachectl.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/syscall.h>
|
|
#include <asm/unistd.h>
|
|
|
|
/*
|
|
* sys_tas() - test-and-set
|
|
*/
|
|
asmlinkage int sys_tas(int __user *addr)
|
|
{
|
|
int oldval;
|
|
|
|
if (!access_ok(VERIFY_WRITE, addr, sizeof (int)))
|
|
return -EFAULT;
|
|
|
|
/* atomic operation:
|
|
* oldval = *addr; *addr = 1;
|
|
*/
|
|
__asm__ __volatile__ (
|
|
DCACHE_CLEAR("%0", "r4", "%1")
|
|
" .fillinsn\n"
|
|
"1:\n"
|
|
" lock %0, @%1 -> unlock %2, @%1\n"
|
|
"2:\n"
|
|
/* NOTE:
|
|
* The m32r processor can accept interrupts only
|
|
* at the 32-bit instruction boundary.
|
|
* So, in the above code, the "unlock" instruction
|
|
* can be executed continuously after the "lock"
|
|
* instruction execution without any interruptions.
|
|
*/
|
|
".section .fixup,\"ax\"\n"
|
|
" .balign 4\n"
|
|
"3: ldi %0, #%3\n"
|
|
" seth r14, #high(2b)\n"
|
|
" or3 r14, r14, #low(2b)\n"
|
|
" jmp r14\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
" .balign 4\n"
|
|
" .long 1b,3b\n"
|
|
".previous\n"
|
|
: "=&r" (oldval)
|
|
: "r" (addr), "r" (1), "i"(-EFAULT)
|
|
: "r14", "memory"
|
|
#ifdef CONFIG_CHIP_M32700_TS1
|
|
, "r4"
|
|
#endif /* CONFIG_CHIP_M32700_TS1 */
|
|
);
|
|
|
|
return oldval;
|
|
}
|
|
|
|
asmlinkage int sys_cacheflush(void *addr, int bytes, int cache)
|
|
{
|
|
/* This should flush more selectively ... */
|
|
_flush_cache_all();
|
|
return 0;
|
|
}
|
|
|
|
asmlinkage int sys_cachectl(char *addr, int nbytes, int op)
|
|
{
|
|
/* Not implemented yet. */
|
|
return -ENOSYS;
|
|
}
|
|
|
|
/*
|
|
* Do a system call from kernel instead of calling sys_execve so we
|
|
* end up with proper pt_regs.
|
|
*/
|
|
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
|
|
{
|
|
register long __scno __asm__ ("r7") = __NR_execve;
|
|
register long __arg3 __asm__ ("r2") = (long)(envp);
|
|
register long __arg2 __asm__ ("r1") = (long)(argv);
|
|
register long __res __asm__ ("r0") = (long)(filename);
|
|
__asm__ __volatile__ (
|
|
"trap #" SYSCALL_VECTOR "|| nop"
|
|
: "=r" (__res)
|
|
: "r" (__scno), "0" (__res), "r" (__arg2),
|
|
"r" (__arg3)
|
|
: "memory");
|
|
return __res;
|
|
}
|