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>
28 #include <asm/uaccess.h>
29 #include <asm/utrap.h>
30 #include <asm/unistd.h>
35 /* #define DEBUG_UNIMP_SYSCALL */
37 asmlinkage
unsigned long sys_getpagesize(void)
42 #define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
43 #define VA_EXCLUDE_END (0xfffff80000000000UL + (1UL << 32UL))
45 /* Does addr --> addr+len fall within 4GB of the VA-space hole or
46 * overflow past the end of the 64-bit address space?
48 static inline int invalid_64bit_range(unsigned long addr
, unsigned long len
)
50 unsigned long va_exclude_start
, va_exclude_end
;
52 va_exclude_start
= VA_EXCLUDE_START
;
53 va_exclude_end
= VA_EXCLUDE_END
;
55 if (unlikely(len
>= va_exclude_start
))
58 if (unlikely((addr
+ len
) < addr
))
61 if (unlikely((addr
>= va_exclude_start
&& addr
< va_exclude_end
) ||
62 ((addr
+ len
) >= va_exclude_start
&&
63 (addr
+ len
) < va_exclude_end
)))
69 /* These functions differ from the default implementations in
70 * mm/mmap.c in two ways:
72 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
73 * for fixed such mappings we just validate what the user gave us.
74 * 2) For 64-bit tasks we avoid mapping anything within 4GB of
75 * the spitfire/niagara VA-hole.
78 static inline unsigned long COLOR_ALIGN(unsigned long addr
,
81 unsigned long base
= (addr
+SHMLBA
-1)&~(SHMLBA
-1);
82 unsigned long off
= (pgoff
<<PAGE_SHIFT
) & (SHMLBA
-1);
87 unsigned long arch_get_unmapped_area(struct file
*filp
, unsigned long addr
, unsigned long len
, unsigned long pgoff
, unsigned long flags
)
89 struct mm_struct
*mm
= current
->mm
;
90 struct vm_area_struct
* vma
;
91 unsigned long task_size
= TASK_SIZE
;
93 struct vm_unmapped_area_info info
;
95 if (flags
& MAP_FIXED
) {
96 /* We do not accept a shared mapping if it would violate
97 * cache aliasing constraints.
99 if ((flags
& MAP_SHARED
) &&
100 ((addr
- (pgoff
<< PAGE_SHIFT
)) & (SHMLBA
- 1)))
105 if (test_thread_flag(TIF_32BIT
))
106 task_size
= STACK_TOP32
;
107 if (unlikely(len
> task_size
|| len
>= VA_EXCLUDE_START
))
111 if (filp
|| (flags
& MAP_SHARED
))
116 addr
= COLOR_ALIGN(addr
, pgoff
);
118 addr
= PAGE_ALIGN(addr
);
120 vma
= find_vma(mm
, addr
);
121 if (task_size
- len
>= addr
&&
122 (!vma
|| addr
+ len
<= vma
->vm_start
))
128 info
.low_limit
= TASK_UNMAPPED_BASE
;
129 info
.high_limit
= min(task_size
, VA_EXCLUDE_START
);
130 info
.align_mask
= do_color_align
? (PAGE_MASK
& (SHMLBA
- 1)) : 0;
131 info
.align_offset
= pgoff
<< PAGE_SHIFT
;
132 addr
= vm_unmapped_area(&info
);
134 if ((addr
& ~PAGE_MASK
) && task_size
> VA_EXCLUDE_END
) {
135 VM_BUG_ON(addr
!= -ENOMEM
);
136 info
.low_limit
= VA_EXCLUDE_END
;
137 info
.high_limit
= task_size
;
138 addr
= vm_unmapped_area(&info
);
145 arch_get_unmapped_area_topdown(struct file
*filp
, const unsigned long addr0
,
146 const unsigned long len
, const unsigned long pgoff
,
147 const unsigned long flags
)
149 struct vm_area_struct
*vma
;
150 struct mm_struct
*mm
= current
->mm
;
151 unsigned long task_size
= STACK_TOP32
;
152 unsigned long addr
= addr0
;
154 struct vm_unmapped_area_info info
;
156 /* This should only ever run for 32-bit processes. */
157 BUG_ON(!test_thread_flag(TIF_32BIT
));
159 if (flags
& MAP_FIXED
) {
160 /* We do not accept a shared mapping if it would violate
161 * cache aliasing constraints.
163 if ((flags
& MAP_SHARED
) &&
164 ((addr
- (pgoff
<< PAGE_SHIFT
)) & (SHMLBA
- 1)))
169 if (unlikely(len
> task_size
))
173 if (filp
|| (flags
& MAP_SHARED
))
176 /* requesting a specific address */
179 addr
= COLOR_ALIGN(addr
, pgoff
);
181 addr
= PAGE_ALIGN(addr
);
183 vma
= find_vma(mm
, addr
);
184 if (task_size
- len
>= addr
&&
185 (!vma
|| addr
+ len
<= vma
->vm_start
))
189 info
.flags
= VM_UNMAPPED_AREA_TOPDOWN
;
191 info
.low_limit
= PAGE_SIZE
;
192 info
.high_limit
= mm
->mmap_base
;
193 info
.align_mask
= do_color_align
? (PAGE_MASK
& (SHMLBA
- 1)) : 0;
194 info
.align_offset
= pgoff
<< PAGE_SHIFT
;
195 addr
= vm_unmapped_area(&info
);
198 * A failed mmap() very likely causes application failure,
199 * so fall back to the bottom-up function here. This scenario
200 * can happen with large stack limits and large mmap()
203 if (addr
& ~PAGE_MASK
) {
204 VM_BUG_ON(addr
!= -ENOMEM
);
206 info
.low_limit
= TASK_UNMAPPED_BASE
;
207 info
.high_limit
= STACK_TOP32
;
208 addr
= vm_unmapped_area(&info
);
214 /* Try to align mapping such that we align it as much as possible. */
215 unsigned long get_fb_unmapped_area(struct file
*filp
, unsigned long orig_addr
, unsigned long len
, unsigned long pgoff
, unsigned long flags
)
217 unsigned long align_goal
, addr
= -ENOMEM
;
218 unsigned long (*get_area
)(struct file
*, unsigned long,
219 unsigned long, unsigned long, unsigned long);
221 get_area
= current
->mm
->get_unmapped_area
;
223 if (flags
& MAP_FIXED
) {
224 /* Ok, don't mess with it. */
225 return get_area(NULL
, orig_addr
, len
, pgoff
, flags
);
227 flags
&= ~MAP_SHARED
;
229 align_goal
= PAGE_SIZE
;
230 if (len
>= (4UL * 1024 * 1024))
231 align_goal
= (4UL * 1024 * 1024);
232 else if (len
>= (512UL * 1024))
233 align_goal
= (512UL * 1024);
234 else if (len
>= (64UL * 1024))
235 align_goal
= (64UL * 1024);
238 addr
= get_area(NULL
, orig_addr
, len
+ (align_goal
- PAGE_SIZE
), pgoff
, flags
);
239 if (!(addr
& ~PAGE_MASK
)) {
240 addr
= (addr
+ (align_goal
- 1UL)) & ~(align_goal
- 1UL);
244 if (align_goal
== (4UL * 1024 * 1024))
245 align_goal
= (512UL * 1024);
246 else if (align_goal
== (512UL * 1024))
247 align_goal
= (64UL * 1024);
249 align_goal
= PAGE_SIZE
;
250 } while ((addr
& ~PAGE_MASK
) && align_goal
> PAGE_SIZE
);
252 /* Mapping is smaller than 64K or larger areas could not
255 if (addr
& ~PAGE_MASK
)
256 addr
= get_area(NULL
, orig_addr
, len
, pgoff
, flags
);
260 EXPORT_SYMBOL(get_fb_unmapped_area
);
262 /* Essentially the same as PowerPC. */
263 static unsigned long mmap_rnd(void)
265 unsigned long rnd
= 0UL;
267 if (current
->flags
& PF_RANDOMIZE
) {
268 unsigned long val
= get_random_int();
269 if (test_thread_flag(TIF_32BIT
))
270 rnd
= (val
% (1UL << (23UL-PAGE_SHIFT
)));
272 rnd
= (val
% (1UL << (30UL-PAGE_SHIFT
)));
274 return rnd
<< PAGE_SHIFT
;
277 void arch_pick_mmap_layout(struct mm_struct
*mm
)
279 unsigned long random_factor
= mmap_rnd();
283 * Fall back to the standard layout if the personality
284 * bit is set, or if the expected stack growth is unlimited:
286 gap
= rlimit(RLIMIT_STACK
);
287 if (!test_thread_flag(TIF_32BIT
) ||
288 (current
->personality
& ADDR_COMPAT_LAYOUT
) ||
289 gap
== RLIM_INFINITY
||
290 sysctl_legacy_va_layout
) {
291 mm
->mmap_base
= TASK_UNMAPPED_BASE
+ random_factor
;
292 mm
->get_unmapped_area
= arch_get_unmapped_area
;
294 /* We know it's 32-bit */
295 unsigned long task_size
= STACK_TOP32
;
297 if (gap
< 128 * 1024 * 1024)
298 gap
= 128 * 1024 * 1024;
299 if (gap
> (task_size
/ 6 * 5))
300 gap
= (task_size
/ 6 * 5);
302 mm
->mmap_base
= PAGE_ALIGN(task_size
- gap
- random_factor
);
303 mm
->get_unmapped_area
= arch_get_unmapped_area_topdown
;
308 * sys_pipe() is the normal C calling standard for creating
309 * a pipe. It's not the way unix traditionally does this, though.
311 SYSCALL_DEFINE1(sparc_pipe_real
, struct pt_regs
*, regs
)
316 error
= do_pipe_flags(fd
, 0);
319 regs
->u_regs
[UREG_I1
] = fd
[1];
326 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
328 * This is really horribly ugly.
331 SYSCALL_DEFINE6(sparc_ipc
, unsigned int, call
, int, first
, unsigned long, second
,
332 unsigned long, third
, void __user
*, ptr
, long, fifth
)
336 /* No need for backward compatibility. We can start fresh... */
337 if (call
<= SEMCTL
) {
340 err
= sys_semtimedop(first
, ptr
,
341 (unsigned)second
, NULL
);
344 err
= sys_semtimedop(first
, ptr
, (unsigned)second
,
345 (const struct timespec __user
*)
346 (unsigned long) fifth
);
349 err
= sys_semget(first
, (int)second
, (int)third
);
352 err
= sys_semctl(first
, second
,
354 (unsigned long) ptr
);
362 if (call
<= MSGCTL
) {
365 err
= sys_msgsnd(first
, ptr
, (size_t)second
,
369 err
= sys_msgrcv(first
, ptr
, (size_t)second
, fifth
,
373 err
= sys_msgget((key_t
)first
, (int)second
);
376 err
= sys_msgctl(first
, (int)second
| IPC_64
, ptr
);
383 if (call
<= SHMCTL
) {
387 err
= do_shmat(first
, ptr
, (int)second
, &raddr
, SHMLBA
);
390 (ulong __user
*) third
))
396 err
= sys_shmdt(ptr
);
399 err
= sys_shmget(first
, (size_t)second
, (int)third
);
402 err
= sys_shmctl(first
, (int)second
| IPC_64
, ptr
);
415 SYSCALL_DEFINE1(sparc64_personality
, unsigned long, personality
)
419 if (personality(current
->personality
) == PER_LINUX32
&&
420 personality(personality
) == PER_LINUX
)
421 personality
|= PER_LINUX32
;
422 ret
= sys_personality(personality
);
423 if (personality(ret
) == PER_LINUX32
)
429 int sparc_mmap_check(unsigned long addr
, unsigned long len
)
431 if (test_thread_flag(TIF_32BIT
)) {
432 if (len
>= STACK_TOP32
)
435 if (addr
> STACK_TOP32
- len
)
438 if (len
>= VA_EXCLUDE_START
)
441 if (invalid_64bit_range(addr
, len
))
448 /* Linux version of mmap */
449 SYSCALL_DEFINE6(mmap
, unsigned long, addr
, unsigned long, len
,
450 unsigned long, prot
, unsigned long, flags
, unsigned long, fd
,
453 unsigned long retval
= -EINVAL
;
455 if ((off
+ PAGE_ALIGN(len
)) < off
)
457 if (off
& ~PAGE_MASK
)
459 retval
= sys_mmap_pgoff(addr
, len
, prot
, flags
, fd
, off
>> PAGE_SHIFT
);
464 SYSCALL_DEFINE2(64_munmap
, unsigned long, addr
, size_t, len
)
466 if (invalid_64bit_range(addr
, len
))
469 return vm_munmap(addr
, len
);
472 SYSCALL_DEFINE5(64_mremap
, unsigned long, addr
, unsigned long, old_len
,
473 unsigned long, new_len
, unsigned long, flags
,
474 unsigned long, new_addr
)
476 if (test_thread_flag(TIF_32BIT
))
478 return sys_mremap(addr
, old_len
, new_len
, flags
, new_addr
);
481 /* we come to here via sys_nis_syscall so it can setup the regs argument */
482 asmlinkage
unsigned long c_sys_nis_syscall(struct pt_regs
*regs
)
486 /* Don't make the system unusable, if someone goes stuck */
490 printk ("Unimplemented SPARC system call %ld\n",regs
->u_regs
[1]);
491 #ifdef DEBUG_UNIMP_SYSCALL
498 /* #define DEBUG_SPARC_BREAKPOINT */
500 asmlinkage
void sparc_breakpoint(struct pt_regs
*regs
)
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
);
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
;