2 * linux/arch/m32r/kernel/sys_m32r.c
4 * This file contains various random system calls that
5 * have a non-standard calling sequence on the Linux/M32R platform.
7 * Taken from i386 version.
10 #include <linux/errno.h>
11 #include <linux/sched.h>
14 #include <linux/smp.h>
15 #include <linux/sem.h>
16 #include <linux/msg.h>
17 #include <linux/shm.h>
18 #include <linux/stat.h>
19 #include <linux/syscalls.h>
20 #include <linux/mman.h>
21 #include <linux/file.h>
22 #include <linux/utsname.h>
23 #include <linux/ipc.h>
25 #include <asm/uaccess.h>
26 #include <asm/cachectl.h>
27 #include <asm/cacheflush.h>
28 #include <asm/syscall.h>
29 #include <asm/unistd.h>
32 * sys_tas() - test-and-set
34 asmlinkage
int sys_tas(int __user
*addr
)
38 if (!access_ok(VERIFY_WRITE
, addr
, sizeof (int)))
42 * oldval = *addr; *addr = 1;
44 __asm__
__volatile__ (
45 DCACHE_CLEAR("%0", "r4", "%1")
48 " lock %0, @%1 -> unlock %2, @%1\n"
51 * The m32r processor can accept interrupts only
52 * at the 32-bit instruction boundary.
53 * So, in the above code, the "unlock" instruction
54 * can be executed continuously after the "lock"
55 * instruction execution without any interruptions.
57 ".section .fixup,\"ax\"\n"
60 " seth r14, #high(2b)\n"
61 " or3 r14, r14, #low(2b)\n"
64 ".section __ex_table,\"a\"\n"
69 : "r" (addr
), "r" (1), "i"(-EFAULT
)
71 #ifdef CONFIG_CHIP_M32700_TS1
73 #endif /* CONFIG_CHIP_M32700_TS1 */
79 asmlinkage
long sys_mmap2(unsigned long addr
, unsigned long len
,
80 unsigned long prot
, unsigned long flags
,
81 unsigned long fd
, unsigned long pgoff
)
84 struct file
*file
= NULL
;
86 flags
&= ~(MAP_EXECUTABLE
| MAP_DENYWRITE
);
87 if (!(flags
& MAP_ANONYMOUS
)) {
93 down_write(¤t
->mm
->mmap_sem
);
94 error
= do_mmap_pgoff(file
, addr
, len
, prot
, flags
, pgoff
);
95 up_write(¤t
->mm
->mmap_sem
);
104 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
106 * This is really horribly ugly.
108 asmlinkage
int sys_ipc(uint call
, int first
, int second
,
109 int third
, void __user
*ptr
, long fifth
)
113 version
= call
>> 16; /* hack for backward compatibility */
118 return sys_semtimedop(first
, (struct sembuf __user
*)ptr
,
121 return sys_semtimedop(first
, (struct sembuf __user
*)ptr
,
122 second
, (const struct timespec __user
*)fifth
);
124 return sys_semget (first
, second
, third
);
129 if (get_user(fourth
.__pad
, (void __user
* __user
*) ptr
))
131 return sys_semctl (first
, second
, third
, fourth
);
135 return sys_msgsnd (first
, (struct msgbuf __user
*) ptr
,
140 struct ipc_kludge tmp
;
144 if (copy_from_user(&tmp
,
145 (struct ipc_kludge __user
*) ptr
,
148 return sys_msgrcv (first
, tmp
.msgp
, second
,
152 return sys_msgrcv (first
,
153 (struct msgbuf __user
*) ptr
,
154 second
, fifth
, third
);
157 return sys_msgget ((key_t
) first
, second
);
159 return sys_msgctl (first
, second
,
160 (struct msqid_ds __user
*) ptr
);
164 if (!access_ok(VERIFY_WRITE
, (ulong __user
*) third
,
167 ret
= do_shmat (first
, (char __user
*) ptr
, second
, &raddr
);
170 return put_user (raddr
, (ulong __user
*) third
);
173 return sys_shmdt ((char __user
*)ptr
);
175 return sys_shmget (first
, second
, third
);
177 return sys_shmctl (first
, second
,
178 (struct shmid_ds __user
*) ptr
);
184 asmlinkage
int sys_uname(struct old_utsname __user
* name
)
190 err
= copy_to_user(name
, utsname(), sizeof (*name
));
192 return err
?-EFAULT
:0;
195 asmlinkage
int sys_cacheflush(void *addr
, int bytes
, int cache
)
197 /* This should flush more selectively ... */
202 asmlinkage
int sys_cachectl(char *addr
, int nbytes
, int op
)
204 /* Not implemented yet. */
209 * Do a system call from kernel instead of calling sys_execve so we
210 * end up with proper pt_regs.
212 int kernel_execve(const char *filename
, char *const argv
[], char *const envp
[])
214 register long __scno
__asm__ ("r7") = __NR_execve
;
215 register long __arg3
__asm__ ("r2") = (long)(envp
);
216 register long __arg2
__asm__ ("r1") = (long)(argv
);
217 register long __res
__asm__ ("r0") = (long)(filename
);
218 __asm__
__volatile__ (
219 "trap #" SYSCALL_VECTOR
"|| nop"
221 : "r" (__scno
), "0" (__res
), "r" (__arg2
),
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