aboutsummaryrefslogtreecommitdiffstats
path: root/arch/m32r/kernel/sys_m32r.c
blob: bda85548de6c79c0dceb81279257112443b2becd (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
/*
 * 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/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 <asm/uaccess.h>
#include <asm/cachectl.h>
#include <asm/cacheflush.h>
#include <asm/ipc.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;
}

/*
 * sys_pipe() is the normal C calling standard for creating
 * a pipe. It's not the way Unix traditionally does this, though.
 */
asmlinkage int
sys_pipe(unsigned long r0, unsigned long r1, unsigned long r2,
	unsigned long r3, unsigned long r4, unsigned long r5,
	unsigned long r6, struct pt_regs regs)
{
	int fd[2];
	int error;

	error = do_pipe(fd);
	if (!error) {
		if (copy_to_user((void __user *)r0, fd, 2*sizeof(int)))
			error = -EFAULT;
	}
	return error;
}

asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
	unsigned long prot, unsigned long flags,
	unsigned long fd, unsigned long pgoff)
{
	int error = -EBADF;
	struct file *file = NULL;

	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
	if (!(flags & MAP_ANONYMOUS)) {
		file = fget(fd);
		if (!file)
			goto out;
	}

	down_write(&current->mm->mmap_sem);
	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
	up_write(&current->mm->mmap_sem);

	if (file)
		fput(file);
out:
	return error;
}

/*
 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 *
 * This is really horribly ugly.
 */
asmlinkage int sys_ipc(uint call, int first, int second,
		       int third, void __user *ptr, long fifth)
{
	int version, ret;

	version = call >> 16; /* hack for backward compatibility */
	call &= 0xffff;

	switch (call) {
	case SEMOP:
		return sys_semtimedop(first, (struct sembuf __user *)ptr,
				      second, NULL);
	case SEMTIMEDOP:
		return sys_semtimedop(first, (struct sembuf __user *)ptr,
				      second, (const struct timespec __user *)fifth);
	case SEMGET:
		return sys_semget (first, second, third);
	case SEMCTL: {
		union semun fourth;
		if (!ptr)
			return -EINVAL;
		if (get_user(fourth.__pad, (void __user * __user *) ptr))
			return -EFAULT;
		return sys_semctl (first, second, third, fourth);
		}

	case MSGSND:
		return sys_msgsnd (first, (struct msgbuf __user *) ptr,
				   second, third);
	case MSGRCV:
		switch (version) {
		case 0: {
			struct ipc_kludge tmp;
			if (!ptr)
				return -EINVAL;

			if (copy_from_user(&tmp,
					   (struct ipc_kludge __user *) ptr,
					   sizeof (tmp)))
				return -EFAULT;
			return sys_msgrcv (first, tmp.msgp, second,
					   tmp.msgtyp, third);
			}
		default:
			return sys_msgrcv (first,
					   (struct msgbuf __user *) ptr,
					   second, fifth, third);
		}
	case MSGGET:
		return sys_msgget ((key_t) first, second);
	case MSGCTL:
		return sys_msgctl (first, second,
				   (struct msqid_ds __user *) ptr);
	case SHMAT: {
		ulong raddr;

		if (!access_ok(VERIFY_WRITE, (ulong __user *) third,
				      sizeof(ulong)))
			return -EFAULT;
		ret = do_shmat (first, (char __user *) ptr, second, &raddr);
		if (ret)
			return ret;
		return put_user (raddr, (ulong __user *) third);
		}
	case SHMDT:
		return sys_shmdt ((char __user *)ptr);
	case SHMGET:
		return sys_shmget (first, second, third);
	case SHMCTL:
		return sys_shmctl (first, second,
				   (struct shmid_ds __user *) ptr);
	default:
		return -ENOSYS;
	}
}

asmlinkage int sys_uname(struct old_utsname __user * name)
{
	int err;
	if (!name)
		return -EFAULT;
	down_read(&uts_sem);
	err = copy_to_user(name, utsname(), sizeof (*name));
	up_read(&uts_sem);
	return err?-EFAULT:0;
}

asmlinkage int sys_cacheflush(void *addr, int bytes, int cache)
{
	/* This should flush more selectivly ...  */
	_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;
}