MIPS: Alchemy: prom_putchar is board dependent
[linux-2.6/linux-mips.git] / arch / sparc / kernel / sys_sparc_32.c
blob3a82e65d8db2072b9f4b3d9a2edb9faf55c263a7
1 /* linux/arch/sparc/kernel/sys_sparc.c
3 * This file contains various random system calls that
4 * have a non-standard calling sequence on the Linux/sparc
5 * platform.
6 */
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>
23 #include <linux/ipc.h>
25 #include <asm/uaccess.h>
26 #include <asm/unistd.h>
28 /* #define DEBUG_UNIMP_SYSCALL */
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.
33 asmlinkage unsigned long sys_getpagesize(void)
35 return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
38 #define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1))
40 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
42 struct vm_area_struct * vmm;
44 if (flags & MAP_FIXED) {
45 /* We do not accept a shared mapping if it would violate
46 * cache aliasing constraints.
48 if ((flags & MAP_SHARED) &&
49 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
50 return -EINVAL;
51 return addr;
54 /* See asm-sparc/uaccess.h */
55 if (len > TASK_SIZE - PAGE_SIZE)
56 return -ENOMEM;
57 if (ARCH_SUN4C && len > 0x20000000)
58 return -ENOMEM;
59 if (!addr)
60 addr = TASK_UNMAPPED_BASE;
62 if (flags & MAP_SHARED)
63 addr = COLOUR_ALIGN(addr);
64 else
65 addr = PAGE_ALIGN(addr);
67 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
68 /* At this point: (!vmm || addr < vmm->vm_end). */
69 if (ARCH_SUN4C && addr < 0xe0000000 && 0x20000000 - len < addr) {
70 addr = PAGE_OFFSET;
71 vmm = find_vma(current->mm, PAGE_OFFSET);
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);
84 * sys_pipe() is the normal C calling standard for creating
85 * a pipe. It's not the way unix traditionally does this, though.
87 asmlinkage int sparc_pipe(struct pt_regs *regs)
89 int fd[2];
90 int error;
92 error = do_pipe_flags(fd, 0);
93 if (error)
94 goto out;
95 regs->u_regs[UREG_I1] = fd[1];
96 error = fd[0];
97 out:
98 return error;
102 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
104 * This is really horribly ugly.
107 asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
109 int version, err;
111 version = call >> 16; /* hack for backward compatibility */
112 call &= 0xffff;
114 if (call <= SEMCTL)
115 switch (call) {
116 case SEMOP:
117 err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
118 goto out;
119 case SEMTIMEDOP:
120 err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, (const struct timespec __user *) fifth);
121 goto out;
122 case SEMGET:
123 err = sys_semget (first, second, third);
124 goto out;
125 case SEMCTL: {
126 union semun fourth;
127 err = -EINVAL;
128 if (!ptr)
129 goto out;
130 err = -EFAULT;
131 if (get_user(fourth.__pad,
132 (void __user * __user *)ptr))
133 goto out;
134 err = sys_semctl (first, second, third, fourth);
135 goto out;
137 default:
138 err = -ENOSYS;
139 goto out;
141 if (call <= MSGCTL)
142 switch (call) {
143 case MSGSND:
144 err = sys_msgsnd (first, (struct msgbuf __user *) ptr,
145 second, third);
146 goto out;
147 case MSGRCV:
148 switch (version) {
149 case 0: {
150 struct ipc_kludge tmp;
151 err = -EINVAL;
152 if (!ptr)
153 goto out;
154 err = -EFAULT;
155 if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp)))
156 goto out;
157 err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
158 goto out;
160 case 1: default:
161 err = sys_msgrcv (first,
162 (struct msgbuf __user *) ptr,
163 second, fifth, third);
164 goto out;
166 case MSGGET:
167 err = sys_msgget ((key_t) first, second);
168 goto out;
169 case MSGCTL:
170 err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
171 goto out;
172 default:
173 err = -ENOSYS;
174 goto out;
176 if (call <= SHMCTL)
177 switch (call) {
178 case SHMAT:
179 switch (version) {
180 case 0: default: {
181 ulong raddr;
182 err = do_shmat (first, (char __user *) ptr, second, &raddr);
183 if (err)
184 goto out;
185 err = -EFAULT;
186 if (put_user (raddr, (ulong __user *) third))
187 goto out;
188 err = 0;
189 goto out;
191 case 1: /* iBCS2 emulator entry point */
192 err = -EINVAL;
193 goto out;
195 case SHMDT:
196 err = sys_shmdt ((char __user *)ptr);
197 goto out;
198 case SHMGET:
199 err = sys_shmget (first, second, third);
200 goto out;
201 case SHMCTL:
202 err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
203 goto out;
204 default:
205 err = -ENOSYS;
206 goto out;
208 else
209 err = -ENOSYS;
210 out:
211 return err;
214 int sparc_mmap_check(unsigned long addr, unsigned long len)
216 if (ARCH_SUN4C &&
217 (len > 0x20000000 ||
218 (addr < 0xe0000000 && addr + len > 0x20000000)))
219 return -EINVAL;
221 /* See asm-sparc/uaccess.h */
222 if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
223 return -EINVAL;
225 return 0;
228 /* Linux version of mmap */
230 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
231 unsigned long prot, unsigned long flags, unsigned long fd,
232 unsigned long pgoff)
234 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
235 we have. */
236 return sys_mmap_pgoff(addr, len, prot, flags, fd,
237 pgoff >> (PAGE_SHIFT - 12));
240 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
241 unsigned long prot, unsigned long flags, unsigned long fd,
242 unsigned long off)
244 /* no alignment check? */
245 return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
248 long sparc_remap_file_pages(unsigned long start, unsigned long size,
249 unsigned long prot, unsigned long pgoff,
250 unsigned long flags)
252 /* This works on an existing mmap so we don't need to validate
253 * the range as that was done at the original mmap call.
255 return sys_remap_file_pages(start, size, prot,
256 (pgoff >> (PAGE_SHIFT - 12)), flags);
259 /* we come to here via sys_nis_syscall so it can setup the regs argument */
260 asmlinkage unsigned long
261 c_sys_nis_syscall (struct pt_regs *regs)
263 static int count = 0;
265 if (count++ > 5)
266 return -ENOSYS;
267 printk ("%s[%d]: Unimplemented SPARC system call %d\n",
268 current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
269 #ifdef DEBUG_UNIMP_SYSCALL
270 show_regs (regs);
271 #endif
272 return -ENOSYS;
275 /* #define DEBUG_SPARC_BREAKPOINT */
277 asmlinkage void
278 sparc_breakpoint (struct pt_regs *regs)
280 siginfo_t info;
282 lock_kernel();
283 #ifdef DEBUG_SPARC_BREAKPOINT
284 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
285 #endif
286 info.si_signo = SIGTRAP;
287 info.si_errno = 0;
288 info.si_code = TRAP_BRKPT;
289 info.si_addr = (void __user *)regs->pc;
290 info.si_trapno = 0;
291 force_sig_info(SIGTRAP, &info, current);
293 #ifdef DEBUG_SPARC_BREAKPOINT
294 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
295 #endif
296 unlock_kernel();
299 asmlinkage int
300 sparc_sigaction (int sig, const struct old_sigaction __user *act,
301 struct old_sigaction __user *oact)
303 struct k_sigaction new_ka, old_ka;
304 int ret;
306 WARN_ON_ONCE(sig >= 0);
307 sig = -sig;
309 if (act) {
310 unsigned long mask;
312 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
313 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
314 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
315 return -EFAULT;
316 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
317 __get_user(mask, &act->sa_mask);
318 siginitset(&new_ka.sa.sa_mask, mask);
319 new_ka.ka_restorer = NULL;
322 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
324 if (!ret && oact) {
325 /* In the clone() case we could copy half consistent
326 * state to the user, however this could sleep and
327 * deadlock us if we held the signal lock on SMP. So for
328 * now I take the easy way out and do no locking.
330 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
331 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
332 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
333 return -EFAULT;
334 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
335 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
338 return ret;
341 asmlinkage long
342 sys_rt_sigaction(int sig,
343 const struct sigaction __user *act,
344 struct sigaction __user *oact,
345 void __user *restorer,
346 size_t sigsetsize)
348 struct k_sigaction new_ka, old_ka;
349 int ret;
351 /* XXX: Don't preclude handling different sized sigset_t's. */
352 if (sigsetsize != sizeof(sigset_t))
353 return -EINVAL;
355 if (act) {
356 new_ka.ka_restorer = restorer;
357 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
358 return -EFAULT;
361 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
363 if (!ret && oact) {
364 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
365 return -EFAULT;
368 return ret;
371 asmlinkage int sys_getdomainname(char __user *name, int len)
373 int nlen, err;
375 if (len < 0)
376 return -EINVAL;
378 down_read(&uts_sem);
380 nlen = strlen(utsname()->domainname) + 1;
381 err = -EINVAL;
382 if (nlen > len)
383 goto out;
385 err = -EFAULT;
386 if (!copy_to_user(name, utsname()->domainname, nlen))
387 err = 0;
389 out:
390 up_read(&uts_sem);
391 return err;
395 * Do a system call from kernel instead of calling sys_execve so we
396 * end up with proper pt_regs.
398 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
400 long __res;
401 register long __g1 __asm__ ("g1") = __NR_execve;
402 register long __o0 __asm__ ("o0") = (long)(filename);
403 register long __o1 __asm__ ("o1") = (long)(argv);
404 register long __o2 __asm__ ("o2") = (long)(envp);
405 asm volatile ("t 0x10\n\t"
406 "bcc 1f\n\t"
407 "mov %%o0, %0\n\t"
408 "sub %%g0, %%o0, %0\n\t"
409 "1:\n\t"
410 : "=r" (__res), "=&r" (__o0)
411 : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
412 : "cc");
413 return __res;