1 /* linux/arch/sparc64/kernel/sys_sparc.c
3 * This file contains various random system calls that
4 * have a non-standard calling sequence on the Linux/sparc
8 #include <linux/errno.h>
9 #include <linux/types.h>
10 #include <linux/sched.h>
12 #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/mman.h>
19 #include <linux/utsname.h>
20 #include <linux/smp.h>
21 #include <linux/slab.h>
22 #include <linux/syscalls.h>
23 #include <linux/ipc.h>
24 #include <linux/personality.h>
25 #include <linux/random.h>
26 #include <linux/export.h>
27 #include <linux/context_tracking.h>
29 #include <asm/uaccess.h>
30 #include <asm/utrap.h>
31 #include <asm/unistd.h>
37 /* #define DEBUG_UNIMP_SYSCALL */
39 asmlinkage unsigned long sys_getpagesize(void)
44 /* Does addr --> addr+len fall within 4GB of the VA-space hole or
45 * overflow past the end of the 64-bit address space?
47 static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
49 unsigned long va_exclude_start, va_exclude_end;
51 va_exclude_start = VA_EXCLUDE_START;
52 va_exclude_end = VA_EXCLUDE_END;
54 if (unlikely(len >= va_exclude_start))
57 if (unlikely((addr + len) < addr))
60 if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
61 ((addr + len) >= va_exclude_start &&
62 (addr + len) < va_exclude_end)))
68 /* These functions differ from the default implementations in
69 * mm/mmap.c in two ways:
71 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
72 * for fixed such mappings we just validate what the user gave us.
73 * 2) For 64-bit tasks we avoid mapping anything within 4GB of
74 * the spitfire/niagara VA-hole.
77 static inline unsigned long COLOR_ALIGN(unsigned long addr,
80 unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
81 unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
86 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
88 struct mm_struct *mm = current->mm;
89 struct vm_area_struct * vma;
90 unsigned long task_size = TASK_SIZE;
92 struct vm_unmapped_area_info info;
94 if (flags & MAP_FIXED) {
95 /* We do not accept a shared mapping if it would violate
96 * cache aliasing constraints.
98 if ((flags & MAP_SHARED) &&
99 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
104 if (test_thread_flag(TIF_32BIT))
105 task_size = STACK_TOP32;
106 if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
110 if (filp || (flags & MAP_SHARED))
115 addr = COLOR_ALIGN(addr, pgoff);
117 addr = PAGE_ALIGN(addr);
119 vma = find_vma(mm, addr);
120 if (task_size - len >= addr &&
121 (!vma || addr + len <= vma->vm_start))
127 info.low_limit = TASK_UNMAPPED_BASE;
128 info.high_limit = min(task_size, VA_EXCLUDE_START);
129 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
130 info.align_offset = pgoff << PAGE_SHIFT;
131 addr = vm_unmapped_area(&info);
133 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
134 VM_BUG_ON(addr != -ENOMEM);
135 info.low_limit = VA_EXCLUDE_END;
136 info.high_limit = task_size;
137 addr = vm_unmapped_area(&info);
144 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
145 const unsigned long len, const unsigned long pgoff,
146 const unsigned long flags)
148 struct vm_area_struct *vma;
149 struct mm_struct *mm = current->mm;
150 unsigned long task_size = STACK_TOP32;
151 unsigned long addr = addr0;
153 struct vm_unmapped_area_info info;
155 /* This should only ever run for 32-bit processes. */
156 BUG_ON(!test_thread_flag(TIF_32BIT));
158 if (flags & MAP_FIXED) {
159 /* We do not accept a shared mapping if it would violate
160 * cache aliasing constraints.
162 if ((flags & MAP_SHARED) &&
163 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
168 if (unlikely(len > task_size))
172 if (filp || (flags & MAP_SHARED))
175 /* requesting a specific address */
178 addr = COLOR_ALIGN(addr, pgoff);
180 addr = PAGE_ALIGN(addr);
182 vma = find_vma(mm, addr);
183 if (task_size - len >= addr &&
184 (!vma || addr + len <= vma->vm_start))
188 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
190 info.low_limit = PAGE_SIZE;
191 info.high_limit = mm->mmap_base;
192 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
193 info.align_offset = pgoff << PAGE_SHIFT;
194 addr = vm_unmapped_area(&info);
197 * A failed mmap() very likely causes application failure,
198 * so fall back to the bottom-up function here. This scenario
199 * can happen with large stack limits and large mmap()
202 if (addr & ~PAGE_MASK) {
203 VM_BUG_ON(addr != -ENOMEM);
205 info.low_limit = TASK_UNMAPPED_BASE;
206 info.high_limit = STACK_TOP32;
207 addr = vm_unmapped_area(&info);
213 /* Try to align mapping such that we align it as much as possible. */
214 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
216 unsigned long align_goal, addr = -ENOMEM;
217 unsigned long (*get_area)(struct file *, unsigned long,
218 unsigned long, unsigned long, unsigned long);
220 get_area = current->mm->get_unmapped_area;
222 if (flags & MAP_FIXED) {
223 /* Ok, don't mess with it. */
224 return get_area(NULL, orig_addr, len, pgoff, flags);
226 flags &= ~MAP_SHARED;
228 align_goal = PAGE_SIZE;
229 if (len >= (4UL * 1024 * 1024))
230 align_goal = (4UL * 1024 * 1024);
231 else if (len >= (512UL * 1024))
232 align_goal = (512UL * 1024);
233 else if (len >= (64UL * 1024))
234 align_goal = (64UL * 1024);
237 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
238 if (!(addr & ~PAGE_MASK)) {
239 addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
243 if (align_goal == (4UL * 1024 * 1024))
244 align_goal = (512UL * 1024);
245 else if (align_goal == (512UL * 1024))
246 align_goal = (64UL * 1024);
248 align_goal = PAGE_SIZE;
249 } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
251 /* Mapping is smaller than 64K or larger areas could not
254 if (addr & ~PAGE_MASK)
255 addr = get_area(NULL, orig_addr, len, pgoff, flags);
259 EXPORT_SYMBOL(get_fb_unmapped_area);
261 /* Essentially the same as PowerPC. */
262 static unsigned long mmap_rnd(void)
264 unsigned long rnd = 0UL;
266 if (current->flags & PF_RANDOMIZE) {
267 unsigned long val = get_random_int();
268 if (test_thread_flag(TIF_32BIT))
269 rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
271 rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
273 return rnd << PAGE_SHIFT;
276 void arch_pick_mmap_layout(struct mm_struct *mm)
278 unsigned long random_factor = mmap_rnd();
282 * Fall back to the standard layout if the personality
283 * bit is set, or if the expected stack growth is unlimited:
285 gap = rlimit(RLIMIT_STACK);
286 if (!test_thread_flag(TIF_32BIT) ||
287 (current->personality & ADDR_COMPAT_LAYOUT) ||
288 gap == RLIM_INFINITY ||
289 sysctl_legacy_va_layout) {
290 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
291 mm->get_unmapped_area = arch_get_unmapped_area;
293 /* We know it's 32-bit */
294 unsigned long task_size = STACK_TOP32;
296 if (gap < 128 * 1024 * 1024)
297 gap = 128 * 1024 * 1024;
298 if (gap > (task_size / 6 * 5))
299 gap = (task_size / 6 * 5);
301 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
302 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
307 * sys_pipe() is the normal C calling standard for creating
308 * a pipe. It's not the way unix traditionally does this, though.
310 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
315 error = do_pipe_flags(fd, 0);
318 regs->u_regs[UREG_I1] = fd[1];
325 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
327 * This is really horribly ugly.
330 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
331 unsigned long, third, void __user *, ptr, long, fifth)
335 /* No need for backward compatibility. We can start fresh... */
336 if (call <= SEMCTL) {
339 err = sys_semtimedop(first, ptr,
340 (unsigned)second, NULL);
343 err = sys_semtimedop(first, ptr, (unsigned)second,
344 (const struct timespec __user *)
345 (unsigned long) fifth);
348 err = sys_semget(first, (int)second, (int)third);
351 err = sys_semctl(first, second,
353 (unsigned long) ptr);
361 if (call <= MSGCTL) {
364 err = sys_msgsnd(first, ptr, (size_t)second,
368 err = sys_msgrcv(first, ptr, (size_t)second, fifth,
372 err = sys_msgget((key_t)first, (int)second);
375 err = sys_msgctl(first, (int)second | IPC_64, ptr);
382 if (call <= SHMCTL) {
386 err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
389 (ulong __user *) third))
395 err = sys_shmdt(ptr);
398 err = sys_shmget(first, (size_t)second, (int)third);
401 err = sys_shmctl(first, (int)second | IPC_64, ptr);
414 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
418 if (personality(current->personality) == PER_LINUX32 &&
419 personality(personality) == PER_LINUX)
420 personality |= PER_LINUX32;
421 ret = sys_personality(personality);
422 if (personality(ret) == PER_LINUX32)
428 int sparc_mmap_check(unsigned long addr, unsigned long len)
430 if (test_thread_flag(TIF_32BIT)) {
431 if (len >= STACK_TOP32)
434 if (addr > STACK_TOP32 - len)
437 if (len >= VA_EXCLUDE_START)
440 if (invalid_64bit_range(addr, len))
447 /* Linux version of mmap */
448 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
449 unsigned long, prot, unsigned long, flags, unsigned long, fd,
452 unsigned long retval = -EINVAL;
454 if ((off + PAGE_ALIGN(len)) < off)
456 if (off & ~PAGE_MASK)
458 retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
463 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
465 if (invalid_64bit_range(addr, len))
468 return vm_munmap(addr, len);
471 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
472 unsigned long, new_len, unsigned long, flags,
473 unsigned long, new_addr)
475 if (test_thread_flag(TIF_32BIT))
477 return sys_mremap(addr, old_len, new_len, flags, new_addr);
480 /* we come to here via sys_nis_syscall so it can setup the regs argument */
481 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
485 /* Don't make the system unusable, if someone goes stuck */
489 printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
490 #ifdef DEBUG_UNIMP_SYSCALL
497 /* #define DEBUG_SPARC_BREAKPOINT */
499 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
501 enum ctx_state prev_state = exception_enter();
504 if (test_thread_flag(TIF_32BIT)) {
505 regs->tpc &= 0xffffffff;
506 regs->tnpc &= 0xffffffff;
508 #ifdef DEBUG_SPARC_BREAKPOINT
509 printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
511 info.si_signo = SIGTRAP;
513 info.si_code = TRAP_BRKPT;
514 info.si_addr = (void __user *)regs->tpc;
516 force_sig_info(SIGTRAP, &info, current);
517 #ifdef DEBUG_SPARC_BREAKPOINT
518 printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
520 exception_exit(prev_state);
523 extern void check_pending(int signum);
525 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
534 nlen = strlen(utsname()->domainname) + 1;
540 if (!copy_to_user(name, utsname()->domainname, nlen))
548 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
549 utrap_handler_t, new_p, utrap_handler_t, new_d,
550 utrap_handler_t __user *, old_p,
551 utrap_handler_t __user *, old_d)
553 if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
555 if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
557 if (!current_thread_info()->utraps) {
558 if (put_user(NULL, old_p))
561 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
566 if (put_user(NULL, old_d))
571 if (!current_thread_info()->utraps) {
572 current_thread_info()->utraps =
573 kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
574 if (!current_thread_info()->utraps)
576 current_thread_info()->utraps[0] = 1;
578 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
579 current_thread_info()->utraps[0] > 1) {
580 unsigned long *p = current_thread_info()->utraps;
582 current_thread_info()->utraps =
583 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
585 if (!current_thread_info()->utraps) {
586 current_thread_info()->utraps = p;
590 current_thread_info()->utraps[0] = 1;
591 memcpy(current_thread_info()->utraps+1, p+1,
592 UT_TRAP_INSTRUCTION_31*sizeof(long));
596 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
600 if (put_user(NULL, old_d))
603 current_thread_info()->utraps[type] = (long)new_p;
608 asmlinkage long sparc_memory_ordering(unsigned long model,
609 struct pt_regs *regs)
613 regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
617 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
618 struct sigaction __user *, oact, void __user *, restorer,
621 struct k_sigaction new_ka, old_ka;
624 /* XXX: Don't preclude handling different sized sigset_t's. */
625 if (sigsetsize != sizeof(sigset_t))
629 new_ka.ka_restorer = restorer;
630 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
634 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
637 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
644 asmlinkage long sys_kern_features(void)
646 return KERN_FEATURE_MIXED_MODE_STACK;