Commit | Line | Data |
---|---|---|
5526b7e4 | 1 | /* linux/arch/sparc/kernel/sys_sparc.c |
1da177e4 LT |
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/smp_lock.h> | |
cba4fbbf | 23 | #include <linux/ipc.h> |
1da177e4 LT |
24 | |
25 | #include <asm/uaccess.h> | |
fe74290d | 26 | #include <asm/unistd.h> |
1da177e4 LT |
27 | |
28 | /* #define DEBUG_UNIMP_SYSCALL */ | |
29 | ||
30 | /* XXX Make this per-binary type, this way we can detect the type of | |
31 | * XXX a binary. Every Sparc executable calls this very early on. | |
32 | */ | |
33 | asmlinkage unsigned long sys_getpagesize(void) | |
34 | { | |
35 | return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */ | |
36 | } | |
37 | ||
38 | #define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1)) | |
39 | ||
40 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) | |
41 | { | |
42 | struct vm_area_struct * vmm; | |
43 | ||
44 | if (flags & MAP_FIXED) { | |
45 | /* We do not accept a shared mapping if it would violate | |
46 | * cache aliasing constraints. | |
47 | */ | |
e77414e0 AV |
48 | if ((flags & MAP_SHARED) && |
49 | ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) | |
1da177e4 LT |
50 | return -EINVAL; |
51 | return addr; | |
52 | } | |
53 | ||
54 | /* See asm-sparc/uaccess.h */ | |
55 | if (len > TASK_SIZE - PAGE_SIZE) | |
56 | return -ENOMEM; | |
5110bd21 | 57 | if (ARCH_SUN4C && len > 0x20000000) |
1da177e4 LT |
58 | return -ENOMEM; |
59 | if (!addr) | |
60 | addr = TASK_UNMAPPED_BASE; | |
61 | ||
62 | if (flags & MAP_SHARED) | |
63 | addr = COLOUR_ALIGN(addr); | |
64 | else | |
65 | addr = PAGE_ALIGN(addr); | |
66 | ||
67 | for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { | |
68 | /* At this point: (!vmm || addr < vmm->vm_end). */ | |
5110bd21 | 69 | if (ARCH_SUN4C && addr < 0xe0000000 && 0x20000000 - len < addr) { |
1da177e4 LT |
70 | addr = PAGE_OFFSET; |
71 | vmm = find_vma(current->mm, PAGE_OFFSET); | |
72 | } | |
73 | if (TASK_SIZE - PAGE_SIZE - len < addr) | |
74 | return -ENOMEM; | |
75 | if (!vmm || addr + len <= vmm->vm_start) | |
76 | return addr; | |
77 | addr = vmm->vm_end; | |
78 | if (flags & MAP_SHARED) | |
79 | addr = COLOUR_ALIGN(addr); | |
80 | } | |
81 | } | |
82 | ||
1da177e4 LT |
83 | /* |
84 | * sys_pipe() is the normal C calling standard for creating | |
85 | * a pipe. It's not the way unix traditionally does this, though. | |
86 | */ | |
87 | asmlinkage int sparc_pipe(struct pt_regs *regs) | |
88 | { | |
89 | int fd[2]; | |
90 | int error; | |
91 | ||
ed8cae8b | 92 | error = do_pipe_flags(fd, 0); |
1da177e4 LT |
93 | if (error) |
94 | goto out; | |
95 | regs->u_regs[UREG_I1] = fd[1]; | |
96 | error = fd[0]; | |
97 | out: | |
98 | return error; | |
99 | } | |
100 | ||
94d149c3 | 101 | int sparc_mmap_check(unsigned long addr, unsigned long len) |
3a459756 | 102 | { |
5110bd21 | 103 | if (ARCH_SUN4C && |
3a459756 | 104 | (len > 0x20000000 || |
58163393 | 105 | (addr < 0xe0000000 && addr + len > 0x20000000))) |
3a459756 KK |
106 | return -EINVAL; |
107 | ||
108 | /* See asm-sparc/uaccess.h */ | |
109 | if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE) | |
110 | return -EINVAL; | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
1da177e4 | 115 | /* Linux version of mmap */ |
1da177e4 LT |
116 | |
117 | asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, | |
118 | unsigned long prot, unsigned long flags, unsigned long fd, | |
119 | unsigned long pgoff) | |
120 | { | |
121 | /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE | |
122 | we have. */ | |
f8b72560 AV |
123 | return sys_mmap_pgoff(addr, len, prot, flags, fd, |
124 | pgoff >> (PAGE_SHIFT - 12)); | |
1da177e4 LT |
125 | } |
126 | ||
127 | asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, | |
128 | unsigned long prot, unsigned long flags, unsigned long fd, | |
129 | unsigned long off) | |
130 | { | |
f8b72560 AV |
131 | /* no alignment check? */ |
132 | return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); | |
1da177e4 LT |
133 | } |
134 | ||
135 | long sparc_remap_file_pages(unsigned long start, unsigned long size, | |
136 | unsigned long prot, unsigned long pgoff, | |
137 | unsigned long flags) | |
138 | { | |
139 | /* This works on an existing mmap so we don't need to validate | |
140 | * the range as that was done at the original mmap call. | |
141 | */ | |
142 | return sys_remap_file_pages(start, size, prot, | |
143 | (pgoff >> (PAGE_SHIFT - 12)), flags); | |
144 | } | |
145 | ||
1da177e4 LT |
146 | /* we come to here via sys_nis_syscall so it can setup the regs argument */ |
147 | asmlinkage unsigned long | |
148 | c_sys_nis_syscall (struct pt_regs *regs) | |
149 | { | |
150 | static int count = 0; | |
151 | ||
152 | if (count++ > 5) | |
153 | return -ENOSYS; | |
154 | printk ("%s[%d]: Unimplemented SPARC system call %d\n", | |
19c5870c | 155 | current->comm, task_pid_nr(current), (int)regs->u_regs[1]); |
1da177e4 LT |
156 | #ifdef DEBUG_UNIMP_SYSCALL |
157 | show_regs (regs); | |
158 | #endif | |
159 | return -ENOSYS; | |
160 | } | |
161 | ||
162 | /* #define DEBUG_SPARC_BREAKPOINT */ | |
163 | ||
164 | asmlinkage void | |
165 | sparc_breakpoint (struct pt_regs *regs) | |
166 | { | |
167 | siginfo_t info; | |
168 | ||
169 | lock_kernel(); | |
170 | #ifdef DEBUG_SPARC_BREAKPOINT | |
171 | printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc); | |
172 | #endif | |
173 | info.si_signo = SIGTRAP; | |
174 | info.si_errno = 0; | |
175 | info.si_code = TRAP_BRKPT; | |
176 | info.si_addr = (void __user *)regs->pc; | |
177 | info.si_trapno = 0; | |
178 | force_sig_info(SIGTRAP, &info, current); | |
179 | ||
180 | #ifdef DEBUG_SPARC_BREAKPOINT | |
181 | printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc); | |
182 | #endif | |
183 | unlock_kernel(); | |
184 | } | |
185 | ||
186 | asmlinkage int | |
187 | sparc_sigaction (int sig, const struct old_sigaction __user *act, | |
188 | struct old_sigaction __user *oact) | |
189 | { | |
190 | struct k_sigaction new_ka, old_ka; | |
191 | int ret; | |
192 | ||
5526b7e4 DM |
193 | WARN_ON_ONCE(sig >= 0); |
194 | sig = -sig; | |
1da177e4 LT |
195 | |
196 | if (act) { | |
197 | unsigned long mask; | |
198 | ||
199 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
200 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
201 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) | |
202 | return -EFAULT; | |
203 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
204 | __get_user(mask, &act->sa_mask); | |
205 | siginitset(&new_ka.sa.sa_mask, mask); | |
206 | new_ka.ka_restorer = NULL; | |
207 | } | |
208 | ||
209 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
210 | ||
211 | if (!ret && oact) { | |
212 | /* In the clone() case we could copy half consistent | |
213 | * state to the user, however this could sleep and | |
214 | * deadlock us if we held the signal lock on SMP. So for | |
215 | * now I take the easy way out and do no locking. | |
216 | */ | |
217 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
218 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
219 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) | |
220 | return -EFAULT; | |
221 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
222 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
223 | } | |
224 | ||
225 | return ret; | |
226 | } | |
227 | ||
228 | asmlinkage long | |
229 | sys_rt_sigaction(int sig, | |
230 | const struct sigaction __user *act, | |
231 | struct sigaction __user *oact, | |
232 | void __user *restorer, | |
233 | size_t sigsetsize) | |
234 | { | |
235 | struct k_sigaction new_ka, old_ka; | |
236 | int ret; | |
237 | ||
238 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
239 | if (sigsetsize != sizeof(sigset_t)) | |
240 | return -EINVAL; | |
241 | ||
1da177e4 LT |
242 | if (act) { |
243 | new_ka.ka_restorer = restorer; | |
244 | if (copy_from_user(&new_ka.sa, act, sizeof(*act))) | |
245 | return -EFAULT; | |
246 | } | |
247 | ||
248 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
249 | ||
250 | if (!ret && oact) { | |
251 | if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) | |
252 | return -EFAULT; | |
253 | } | |
254 | ||
255 | return ret; | |
256 | } | |
257 | ||
258 | asmlinkage int sys_getdomainname(char __user *name, int len) | |
259 | { | |
8310a32c | 260 | int nlen, err; |
1da177e4 | 261 | |
b9c54f91 | 262 | if (len < 0) |
8310a32c DM |
263 | return -EINVAL; |
264 | ||
1da177e4 LT |
265 | down_read(&uts_sem); |
266 | ||
e9ff3990 | 267 | nlen = strlen(utsname()->domainname) + 1; |
b9c54f91 AW |
268 | err = -EINVAL; |
269 | if (nlen > len) | |
270 | goto out; | |
8310a32c DM |
271 | |
272 | err = -EFAULT; | |
e9ff3990 | 273 | if (!copy_to_user(name, utsname()->domainname, nlen)) |
8310a32c DM |
274 | err = 0; |
275 | ||
b9c54f91 | 276 | out: |
1da177e4 LT |
277 | up_read(&uts_sem); |
278 | return err; | |
279 | } | |
fe74290d AB |
280 | |
281 | /* | |
282 | * Do a system call from kernel instead of calling sys_execve so we | |
283 | * end up with proper pt_regs. | |
284 | */ | |
285 | int kernel_execve(const char *filename, char *const argv[], char *const envp[]) | |
286 | { | |
287 | long __res; | |
288 | register long __g1 __asm__ ("g1") = __NR_execve; | |
289 | register long __o0 __asm__ ("o0") = (long)(filename); | |
290 | register long __o1 __asm__ ("o1") = (long)(argv); | |
291 | register long __o2 __asm__ ("o2") = (long)(envp); | |
292 | asm volatile ("t 0x10\n\t" | |
293 | "bcc 1f\n\t" | |
294 | "mov %%o0, %0\n\t" | |
295 | "sub %%g0, %%o0, %0\n\t" | |
296 | "1:\n\t" | |
297 | : "=r" (__res), "=&r" (__o0) | |
298 | : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1) | |
299 | : "cc"); | |
300 | return __res; | |
301 | } |