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>
36 /* #define DEBUG_UNIMP_SYSCALL */
38 asmlinkage unsigned long sys_getpagesize(void)
43 /* Does addr --> addr+len fall within 4GB of the VA-space hole or
44 * overflow past the end of the 64-bit address space?
46 static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
48 unsigned long va_exclude_start, va_exclude_end;
50 va_exclude_start = VA_EXCLUDE_START;
51 va_exclude_end = VA_EXCLUDE_END;
53 if (unlikely(len >= va_exclude_start))
56 if (unlikely((addr + len) < addr))
59 if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
60 ((addr + len) >= va_exclude_start &&
61 (addr + len) < va_exclude_end)))
67 /* These functions differ from the default implementations in
68 * mm/mmap.c in two ways:
70 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
71 * for fixed such mappings we just validate what the user gave us.
72 * 2) For 64-bit tasks we avoid mapping anything within 4GB of
73 * the spitfire/niagara VA-hole.
76 static inline unsigned long COLOR_ALIGN(unsigned long addr,
79 unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
80 unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
85 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
87 struct mm_struct *mm = current->mm;
88 struct vm_area_struct * vma;
89 unsigned long task_size = TASK_SIZE;
91 struct vm_unmapped_area_info info;
93 if (flags & MAP_FIXED) {
94 /* We do not accept a shared mapping if it would violate
95 * cache aliasing constraints.
97 if ((flags & MAP_SHARED) &&
98 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
103 if (test_thread_flag(TIF_32BIT))
104 task_size = STACK_TOP32;
105 if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
109 if (filp || (flags & MAP_SHARED))
114 addr = COLOR_ALIGN(addr, pgoff);
116 addr = PAGE_ALIGN(addr);
118 vma = find_vma(mm, addr);
119 if (task_size - len >= addr &&
120 (!vma || addr + len <= vma->vm_start))
126 info.low_limit = TASK_UNMAPPED_BASE;
127 info.high_limit = min(task_size, VA_EXCLUDE_START);
128 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
129 info.align_offset = pgoff << PAGE_SHIFT;
130 addr = vm_unmapped_area(&info);
132 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
133 VM_BUG_ON(addr != -ENOMEM);
134 info.low_limit = VA_EXCLUDE_END;
135 info.high_limit = task_size;
136 addr = vm_unmapped_area(&info);
143 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
144 const unsigned long len, const unsigned long pgoff,
145 const unsigned long flags)
147 struct vm_area_struct *vma;
148 struct mm_struct *mm = current->mm;
149 unsigned long task_size = STACK_TOP32;
150 unsigned long addr = addr0;
152 struct vm_unmapped_area_info info;
154 /* This should only ever run for 32-bit processes. */
155 BUG_ON(!test_thread_flag(TIF_32BIT));
157 if (flags & MAP_FIXED) {
158 /* We do not accept a shared mapping if it would violate
159 * cache aliasing constraints.
161 if ((flags & MAP_SHARED) &&
162 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
167 if (unlikely(len > task_size))
171 if (filp || (flags & MAP_SHARED))
174 /* requesting a specific address */
177 addr = COLOR_ALIGN(addr, pgoff);
179 addr = PAGE_ALIGN(addr);
181 vma = find_vma(mm, addr);
182 if (task_size - len >= addr &&
183 (!vma || addr + len <= vma->vm_start))
187 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
189 info.low_limit = PAGE_SIZE;
190 info.high_limit = mm->mmap_base;
191 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
192 info.align_offset = pgoff << PAGE_SHIFT;
193 addr = vm_unmapped_area(&info);
196 * A failed mmap() very likely causes application failure,
197 * so fall back to the bottom-up function here. This scenario
198 * can happen with large stack limits and large mmap()
201 if (addr & ~PAGE_MASK) {
202 VM_BUG_ON(addr != -ENOMEM);
204 info.low_limit = TASK_UNMAPPED_BASE;
205 info.high_limit = STACK_TOP32;
206 addr = vm_unmapped_area(&info);
212 /* Try to align mapping such that we align it as much as possible. */
213 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
215 unsigned long align_goal, addr = -ENOMEM;
216 unsigned long (*get_area)(struct file *, unsigned long,
217 unsigned long, unsigned long, unsigned long);
219 get_area = current->mm->get_unmapped_area;
221 if (flags & MAP_FIXED) {
222 /* Ok, don't mess with it. */
223 return get_area(NULL, orig_addr, len, pgoff, flags);
225 flags &= ~MAP_SHARED;
227 align_goal = PAGE_SIZE;
228 if (len >= (4UL * 1024 * 1024))
229 align_goal = (4UL * 1024 * 1024);
230 else if (len >= (512UL * 1024))
231 align_goal = (512UL * 1024);
232 else if (len >= (64UL * 1024))
233 align_goal = (64UL * 1024);
236 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
237 if (!(addr & ~PAGE_MASK)) {
238 addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
242 if (align_goal == (4UL * 1024 * 1024))
243 align_goal = (512UL * 1024);
244 else if (align_goal == (512UL * 1024))
245 align_goal = (64UL * 1024);
247 align_goal = PAGE_SIZE;
248 } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
250 /* Mapping is smaller than 64K or larger areas could not
253 if (addr & ~PAGE_MASK)
254 addr = get_area(NULL, orig_addr, len, pgoff, flags);
258 EXPORT_SYMBOL(get_fb_unmapped_area);
260 /* Essentially the same as PowerPC. */
261 static unsigned long mmap_rnd(void)
263 unsigned long rnd = 0UL;
265 if (current->flags & PF_RANDOMIZE) {
266 unsigned long val = get_random_int();
267 if (test_thread_flag(TIF_32BIT))
268 rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
270 rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
272 return rnd << PAGE_SHIFT;
275 void arch_pick_mmap_layout(struct mm_struct *mm)
277 unsigned long random_factor = mmap_rnd();
281 * Fall back to the standard layout if the personality
282 * bit is set, or if the expected stack growth is unlimited:
284 gap = rlimit(RLIMIT_STACK);
285 if (!test_thread_flag(TIF_32BIT) ||
286 (current->personality & ADDR_COMPAT_LAYOUT) ||
287 gap == RLIM_INFINITY ||
288 sysctl_legacy_va_layout) {
289 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
290 mm->get_unmapped_area = arch_get_unmapped_area;
292 /* We know it's 32-bit */
293 unsigned long task_size = STACK_TOP32;
295 if (gap < 128 * 1024 * 1024)
296 gap = 128 * 1024 * 1024;
297 if (gap > (task_size / 6 * 5))
298 gap = (task_size / 6 * 5);
300 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
301 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
306 * sys_pipe() is the normal C calling standard for creating
307 * a pipe. It's not the way unix traditionally does this, though.
309 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
314 error = do_pipe_flags(fd, 0);
317 regs->u_regs[UREG_I1] = fd[1];
324 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
326 * This is really horribly ugly.
329 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
330 unsigned long, third, void __user *, ptr, long, fifth)
334 /* No need for backward compatibility. We can start fresh... */
335 if (call <= SEMCTL) {
338 err = sys_semtimedop(first, ptr,
339 (unsigned)second, NULL);
342 err = sys_semtimedop(first, ptr, (unsigned)second,
343 (const struct timespec __user *)
344 (unsigned long) fifth);
347 err = sys_semget(first, (int)second, (int)third);
350 err = sys_semctl(first, second,
352 (unsigned long) ptr);
360 if (call <= MSGCTL) {
363 err = sys_msgsnd(first, ptr, (size_t)second,
367 err = sys_msgrcv(first, ptr, (size_t)second, fifth,
371 err = sys_msgget((key_t)first, (int)second);
374 err = sys_msgctl(first, (int)second | IPC_64, ptr);
381 if (call <= SHMCTL) {
385 err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
388 (ulong __user *) third))
394 err = sys_shmdt(ptr);
397 err = sys_shmget(first, (size_t)second, (int)third);
400 err = sys_shmctl(first, (int)second | IPC_64, ptr);
413 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
417 if (personality(current->personality) == PER_LINUX32 &&
418 personality(personality) == PER_LINUX)
419 personality |= PER_LINUX32;
420 ret = sys_personality(personality);
421 if (personality(ret) == PER_LINUX32)
427 int sparc_mmap_check(unsigned long addr, unsigned long len)
429 if (test_thread_flag(TIF_32BIT)) {
430 if (len >= STACK_TOP32)
433 if (addr > STACK_TOP32 - len)
436 if (len >= VA_EXCLUDE_START)
439 if (invalid_64bit_range(addr, len))
446 /* Linux version of mmap */
447 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
448 unsigned long, prot, unsigned long, flags, unsigned long, fd,
451 unsigned long retval = -EINVAL;
453 if ((off + PAGE_ALIGN(len)) < off)
455 if (off & ~PAGE_MASK)
457 retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
462 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
464 if (invalid_64bit_range(addr, len))
467 return vm_munmap(addr, len);
470 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
471 unsigned long, new_len, unsigned long, flags,
472 unsigned long, new_addr)
474 if (test_thread_flag(TIF_32BIT))
476 return sys_mremap(addr, old_len, new_len, flags, new_addr);
479 /* we come to here via sys_nis_syscall so it can setup the regs argument */
480 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
484 /* Don't make the system unusable, if someone goes stuck */
488 printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
489 #ifdef DEBUG_UNIMP_SYSCALL
496 /* #define DEBUG_SPARC_BREAKPOINT */
498 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
500 enum ctx_state prev_state = exception_enter();
503 if (test_thread_flag(TIF_32BIT)) {
504 regs->tpc &= 0xffffffff;
505 regs->tnpc &= 0xffffffff;
507 #ifdef DEBUG_SPARC_BREAKPOINT
508 printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
510 info.si_signo = SIGTRAP;
512 info.si_code = TRAP_BRKPT;
513 info.si_addr = (void __user *)regs->tpc;
515 force_sig_info(SIGTRAP, &info, current);
516 #ifdef DEBUG_SPARC_BREAKPOINT
517 printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
519 exception_exit(prev_state);
522 extern void check_pending(int signum);
524 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
533 nlen = strlen(utsname()->domainname) + 1;
539 if (!copy_to_user(name, utsname()->domainname, nlen))
547 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
548 utrap_handler_t, new_p, utrap_handler_t, new_d,
549 utrap_handler_t __user *, old_p,
550 utrap_handler_t __user *, old_d)
552 if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
554 if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
556 if (!current_thread_info()->utraps) {
557 if (put_user(NULL, old_p))
560 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
565 if (put_user(NULL, old_d))
570 if (!current_thread_info()->utraps) {
571 current_thread_info()->utraps =
572 kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
573 if (!current_thread_info()->utraps)
575 current_thread_info()->utraps[0] = 1;
577 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
578 current_thread_info()->utraps[0] > 1) {
579 unsigned long *p = current_thread_info()->utraps;
581 current_thread_info()->utraps =
582 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
584 if (!current_thread_info()->utraps) {
585 current_thread_info()->utraps = p;
589 current_thread_info()->utraps[0] = 1;
590 memcpy(current_thread_info()->utraps+1, p+1,
591 UT_TRAP_INSTRUCTION_31*sizeof(long));
595 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
599 if (put_user(NULL, old_d))
602 current_thread_info()->utraps[type] = (long)new_p;
607 asmlinkage long sparc_memory_ordering(unsigned long model,
608 struct pt_regs *regs)
612 regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
616 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
617 struct sigaction __user *, oact, void __user *, restorer,
620 struct k_sigaction new_ka, old_ka;
623 /* XXX: Don't preclude handling different sized sigset_t's. */
624 if (sigsetsize != sizeof(sigset_t))
628 new_ka.ka_restorer = restorer;
629 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
633 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
636 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
643 asmlinkage long sys_kern_features(void)
645 return KERN_FEATURE_MIXED_MODE_STACK;