1 /* $Id: sys_sparc.c,v 1.70 2001/04/14 01:12:02 davem Exp $
2 * linux/arch/sparc/kernel/sys_sparc.c
4 * This file contains various random system calls that
5 * have a non-standard calling sequence on the Linux/sparc
9 #include <linux/errno.h>
10 #include <linux/types.h>
11 #include <linux/sched.h>
14 #include <linux/file.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/utsname.h>
22 #include <linux/smp.h>
23 #include <linux/smp_lock.h>
25 #include <asm/uaccess.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) && (addr & (SHMLBA - 1)))
53 /* See asm-sparc/uaccess.h */
54 if (len > TASK_SIZE - PAGE_SIZE)
56 if (ARCH_SUN4C_SUN4 && len > 0x20000000)
59 addr = TASK_UNMAPPED_BASE;
61 if (flags & MAP_SHARED)
62 addr = COLOUR_ALIGN(addr);
64 addr = PAGE_ALIGN(addr);
66 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
67 /* At this point: (!vmm || addr < vmm->vm_end). */
68 if (ARCH_SUN4C_SUN4 && addr < 0xe0000000 && 0x20000000 - len < addr) {
70 vmm = find_vma(current->mm, PAGE_OFFSET);
72 if (TASK_SIZE - PAGE_SIZE - len < addr)
74 if (!vmm || addr + len <= vmm->vm_start)
77 if (flags & MAP_SHARED)
78 addr = COLOUR_ALIGN(addr);
82 asmlinkage unsigned long sparc_brk(unsigned long brk)
85 if ((brk & 0xe0000000) != (current->mm->brk & 0xe0000000))
86 return current->mm->brk;
92 * sys_pipe() is the normal C calling standard for creating
93 * a pipe. It's not the way unix traditionally does this, though.
95 asmlinkage int sparc_pipe(struct pt_regs *regs)
103 regs->u_regs[UREG_I1] = fd[1];
110 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
112 * This is really horribly ugly.
115 asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
119 version = call >> 16; /* hack for backward compatibility */
125 err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
128 err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, (const struct timespec __user *) fifth);
131 err = sys_semget (first, second, third);
139 if (get_user(fourth.__pad,
140 (void __user * __user *)ptr))
142 err = sys_semctl (first, second, third, fourth);
152 err = sys_msgsnd (first, (struct msgbuf __user *) ptr,
158 struct ipc_kludge tmp;
163 if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp)))
165 err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
169 err = sys_msgrcv (first,
170 (struct msgbuf __user *) ptr,
171 second, fifth, third);
175 err = sys_msgget ((key_t) first, second);
178 err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
190 err = do_shmat (first, (char __user *) ptr, second, &raddr);
194 if (put_user (raddr, (ulong __user *) third))
199 case 1: /* iBCS2 emulator entry point */
200 err = do_shmat (first, (char __user *) ptr,
201 second, (ulong *) third);
205 err = sys_shmdt ((char __user *)ptr);
208 err = sys_shmget (first, second, third);
211 err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
223 /* Linux version of mmap */
224 static unsigned long do_mmap2(unsigned long addr, unsigned long len,
225 unsigned long prot, unsigned long flags, unsigned long fd,
228 struct file * file = NULL;
229 unsigned long retval = -EBADF;
231 if (!(flags & MAP_ANONYMOUS)) {
238 len = PAGE_ALIGN(len);
239 if (ARCH_SUN4C_SUN4 &&
241 ((flags & MAP_FIXED) &&
242 addr < 0xe0000000 && addr + len > 0x20000000)))
245 /* See asm-sparc/uaccess.h */
246 if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
249 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
251 down_write(¤t->mm->mmap_sem);
252 retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
253 up_write(¤t->mm->mmap_sem);
262 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
263 unsigned long prot, unsigned long flags, unsigned long fd,
266 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
268 return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
271 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
272 unsigned long prot, unsigned long flags, unsigned long fd,
275 return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
278 long sparc_remap_file_pages(unsigned long start, unsigned long size,
279 unsigned long prot, unsigned long pgoff,
282 /* This works on an existing mmap so we don't need to validate
283 * the range as that was done at the original mmap call.
285 return sys_remap_file_pages(start, size, prot,
286 (pgoff >> (PAGE_SHIFT - 12)), flags);
289 extern unsigned long do_mremap(unsigned long addr,
290 unsigned long old_len, unsigned long new_len,
291 unsigned long flags, unsigned long new_addr);
293 asmlinkage unsigned long sparc_mremap(unsigned long addr,
294 unsigned long old_len, unsigned long new_len,
295 unsigned long flags, unsigned long new_addr)
297 struct vm_area_struct *vma;
298 unsigned long ret = -EINVAL;
299 if (ARCH_SUN4C_SUN4) {
300 if (old_len > 0x20000000 || new_len > 0x20000000)
302 if (addr < 0xe0000000 && addr + old_len > 0x20000000)
305 if (old_len > TASK_SIZE - PAGE_SIZE ||
306 new_len > TASK_SIZE - PAGE_SIZE)
308 down_write(¤t->mm->mmap_sem);
309 if (flags & MREMAP_FIXED) {
310 if (ARCH_SUN4C_SUN4 &&
311 new_addr < 0xe0000000 &&
312 new_addr + new_len > 0x20000000)
314 if (new_addr + new_len > TASK_SIZE - PAGE_SIZE)
316 } else if ((ARCH_SUN4C_SUN4 && addr < 0xe0000000 &&
317 addr + new_len > 0x20000000) ||
318 addr + new_len > TASK_SIZE - PAGE_SIZE) {
319 unsigned long map_flags = 0;
320 struct file *file = NULL;
323 if (!(flags & MREMAP_MAYMOVE))
326 vma = find_vma(current->mm, addr);
328 if (vma->vm_flags & VM_SHARED)
329 map_flags |= MAP_SHARED;
333 new_addr = get_unmapped_area(file, addr, new_len,
334 vma ? vma->vm_pgoff : 0,
337 if (new_addr & ~PAGE_MASK)
339 flags |= MREMAP_FIXED;
341 ret = do_mremap(addr, old_len, new_len, flags, new_addr);
343 up_write(¤t->mm->mmap_sem);
348 /* we come to here via sys_nis_syscall so it can setup the regs argument */
349 asmlinkage unsigned long
350 c_sys_nis_syscall (struct pt_regs *regs)
352 static int count = 0;
356 printk ("%s[%d]: Unimplemented SPARC system call %d\n",
357 current->comm, current->pid, (int)regs->u_regs[1]);
358 #ifdef DEBUG_UNIMP_SYSCALL
364 /* #define DEBUG_SPARC_BREAKPOINT */
367 sparc_breakpoint (struct pt_regs *regs)
372 #ifdef DEBUG_SPARC_BREAKPOINT
373 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
375 info.si_signo = SIGTRAP;
377 info.si_code = TRAP_BRKPT;
378 info.si_addr = (void __user *)regs->pc;
380 force_sig_info(SIGTRAP, &info, current);
382 #ifdef DEBUG_SPARC_BREAKPOINT
383 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
389 sparc_sigaction (int sig, const struct old_sigaction __user *act,
390 struct old_sigaction __user *oact)
392 struct k_sigaction new_ka, old_ka;
396 current->thread.new_signal = 1;
403 if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
404 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
405 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
407 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
408 __get_user(mask, &act->sa_mask);
409 siginitset(&new_ka.sa.sa_mask, mask);
410 new_ka.ka_restorer = NULL;
413 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
416 /* In the clone() case we could copy half consistent
417 * state to the user, however this could sleep and
418 * deadlock us if we held the signal lock on SMP. So for
419 * now I take the easy way out and do no locking.
421 if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
422 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
423 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
425 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
426 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
433 sys_rt_sigaction(int sig,
434 const struct sigaction __user *act,
435 struct sigaction __user *oact,
436 void __user *restorer,
439 struct k_sigaction new_ka, old_ka;
442 /* XXX: Don't preclude handling different sized sigset_t's. */
443 if (sigsetsize != sizeof(sigset_t))
446 /* All tasks which use RT signals (effectively) use
449 current->thread.new_signal = 1;
452 new_ka.ka_restorer = restorer;
453 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
457 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
460 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
467 asmlinkage int sys_getdomainname(char __user *name, int len)
474 nlen = strlen(system_utsname.domainname) + 1;
478 if (len > __NEW_UTS_LEN)
480 if (copy_to_user(name, system_utsname.domainname, len))