1/* linux/arch/sparc/kernel/sys_sparc.c
2 *
3 * This file contains various random system calls that
4 * have a non-standard calling sequence on the Linux/sparc
5 * platform.
6 */
7
8#include <linux/errno.h>
9#include <linux/types.h>
10#include <linux/sched.h>
11#include <linux/mm.h>
12#include <linux/fs.h>
13#include <linux/file.h>
14#include <linux/sem.h>
15#include <linux/msg.h>
16#include <linux/shm.h>
17#include <linux/stat.h>
18#include <linux/syscalls.h>
19#include <linux/mman.h>
20#include <linux/utsname.h>
21#include <linux/smp.h>
22#include <linux/ipc.h>
23
24#include <asm/uaccess.h>
25#include <asm/unistd.h>
26
27#include "systbls.h"
28
29/* #define DEBUG_UNIMP_SYSCALL */
30
31/* XXX Make this per-binary type, this way we can detect the type of
32 * XXX a binary.  Every Sparc executable calls this very early on.
33 */
34asmlinkage unsigned long sys_getpagesize(void)
35{
36	return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
37}
38
39unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
40{
41	struct vm_unmapped_area_info info;
42
43	if (flags & MAP_FIXED) {
44		/* We do not accept a shared mapping if it would violate
45		 * cache aliasing constraints.
46		 */
47		if ((flags & MAP_SHARED) &&
48		    ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
49			return -EINVAL;
50		return addr;
51	}
52
53	/* See asm-sparc/uaccess.h */
54	if (len > TASK_SIZE - PAGE_SIZE)
55		return -ENOMEM;
56	if (!addr)
57		addr = TASK_UNMAPPED_BASE;
58
59	info.flags = 0;
60	info.length = len;
61	info.low_limit = addr;
62	info.high_limit = TASK_SIZE;
63	info.align_mask = (flags & MAP_SHARED) ?
64		(PAGE_MASK & (SHMLBA - 1)) : 0;
65	info.align_offset = pgoff << PAGE_SHIFT;
66	return vm_unmapped_area(&info);
67}
68
69/*
70 * sys_pipe() is the normal C calling standard for creating
71 * a pipe. It's not the way unix traditionally does this, though.
72 */
73asmlinkage long sparc_pipe(struct pt_regs *regs)
74{
75	int fd[2];
76	int error;
77
78	error = do_pipe_flags(fd, 0);
79	if (error)
80		goto out;
81	regs->u_regs[UREG_I1] = fd[1];
82	error = fd[0];
83out:
84	return error;
85}
86
87int sparc_mmap_check(unsigned long addr, unsigned long len)
88{
89	/* See asm-sparc/uaccess.h */
90	if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
91		return -EINVAL;
92
93	return 0;
94}
95
96/* Linux version of mmap */
97
98asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
99	unsigned long prot, unsigned long flags, unsigned long fd,
100	unsigned long pgoff)
101{
102	/* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
103	   we have. */
104	return sys_mmap_pgoff(addr, len, prot, flags, fd,
105			      pgoff >> (PAGE_SHIFT - 12));
106}
107
108asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
109	unsigned long prot, unsigned long flags, unsigned long fd,
110	unsigned long off)
111{
112	/* no alignment check? */
113	return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
114}
115
116long sparc_remap_file_pages(unsigned long start, unsigned long size,
117			   unsigned long prot, unsigned long pgoff,
118			   unsigned long flags)
119{
120	/* This works on an existing mmap so we don't need to validate
121	 * the range as that was done at the original mmap call.
122	 */
123	return sys_remap_file_pages(start, size, prot,
124				    (pgoff >> (PAGE_SHIFT - 12)), flags);
125}
126
127/* we come to here via sys_nis_syscall so it can setup the regs argument */
128asmlinkage unsigned long
129c_sys_nis_syscall (struct pt_regs *regs)
130{
131	static int count = 0;
132
133	if (count++ > 5)
134		return -ENOSYS;
135	printk ("%s[%d]: Unimplemented SPARC system call %d\n",
136		current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
137#ifdef DEBUG_UNIMP_SYSCALL
138	show_regs (regs);
139#endif
140	return -ENOSYS;
141}
142
143/* #define DEBUG_SPARC_BREAKPOINT */
144
145asmlinkage void
146sparc_breakpoint (struct pt_regs *regs)
147{
148	siginfo_t info;
149
150#ifdef DEBUG_SPARC_BREAKPOINT
151        printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
152#endif
153	info.si_signo = SIGTRAP;
154	info.si_errno = 0;
155	info.si_code = TRAP_BRKPT;
156	info.si_addr = (void __user *)regs->pc;
157	info.si_trapno = 0;
158	force_sig_info(SIGTRAP, &info, current);
159
160#ifdef DEBUG_SPARC_BREAKPOINT
161	printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
162#endif
163}
164
165SYSCALL_DEFINE3(sparc_sigaction, int, sig,
166		struct old_sigaction __user *,act,
167		struct old_sigaction __user *,oact)
168{
169	WARN_ON_ONCE(sig >= 0);
170	return sys_sigaction(-sig, act, oact);
171}
172
173SYSCALL_DEFINE5(rt_sigaction, int, sig,
174		 const struct sigaction __user *, act,
175		 struct sigaction __user *, oact,
176		 void __user *, restorer,
177		 size_t, sigsetsize)
178{
179	struct k_sigaction new_ka, old_ka;
180	int ret;
181
182	/* XXX: Don't preclude handling different sized sigset_t's.  */
183	if (sigsetsize != sizeof(sigset_t))
184		return -EINVAL;
185
186	if (act) {
187		new_ka.ka_restorer = restorer;
188		if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
189			return -EFAULT;
190	}
191
192	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
193
194	if (!ret && oact) {
195		if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
196			return -EFAULT;
197	}
198
199	return ret;
200}
201
202asmlinkage long sys_getdomainname(char __user *name, int len)
203{
204 	int nlen, err;
205
206	if (len < 0)
207		return -EINVAL;
208
209 	down_read(&uts_sem);
210
211	nlen = strlen(utsname()->domainname) + 1;
212	err = -EINVAL;
213	if (nlen > len)
214		goto out;
215
216	err = -EFAULT;
217	if (!copy_to_user(name, utsname()->domainname, nlen))
218		err = 0;
219
220out:
221	up_read(&uts_sem);
222	return err;
223}
224