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>
27 #include <asm/uaccess.h>
28 #include <asm/utrap.h>
29 #include <asm/perfctr.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 /* Does start,end straddle the VA-space hole? */
70 static inline int straddles_64bit_va_hole(unsigned long start
, unsigned long end
)
72 unsigned long va_exclude_start
, va_exclude_end
;
74 va_exclude_start
= VA_EXCLUDE_START
;
75 va_exclude_end
= VA_EXCLUDE_END
;
77 if (likely(start
< va_exclude_start
&& end
< va_exclude_start
))
80 if (likely(start
>= va_exclude_end
&& end
>= va_exclude_end
))
86 /* These functions differ from the default implementations in
87 * mm/mmap.c in two ways:
89 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
90 * for fixed such mappings we just validate what the user gave us.
91 * 2) For 64-bit tasks we avoid mapping anything within 4GB of
92 * the spitfire/niagara VA-hole.
95 static inline unsigned long COLOUR_ALIGN(unsigned long addr
,
98 unsigned long base
= (addr
+SHMLBA
-1)&~(SHMLBA
-1);
99 unsigned long off
= (pgoff
<<PAGE_SHIFT
) & (SHMLBA
-1);
104 static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr
,
107 unsigned long base
= addr
& ~(SHMLBA
-1);
108 unsigned long off
= (pgoff
<<PAGE_SHIFT
) & (SHMLBA
-1);
110 if (base
+ off
<= addr
)
115 unsigned long arch_get_unmapped_area(struct file
*filp
, unsigned long addr
, unsigned long len
, unsigned long pgoff
, unsigned long flags
)
117 struct mm_struct
*mm
= current
->mm
;
118 struct vm_area_struct
* vma
;
119 unsigned long task_size
= TASK_SIZE
;
120 unsigned long start_addr
;
123 if (flags
& MAP_FIXED
) {
124 /* We do not accept a shared mapping if it would violate
125 * cache aliasing constraints.
127 if ((flags
& MAP_SHARED
) &&
128 ((addr
- (pgoff
<< PAGE_SHIFT
)) & (SHMLBA
- 1)))
133 if (test_thread_flag(TIF_32BIT
))
134 task_size
= STACK_TOP32
;
135 if (unlikely(len
> task_size
|| len
>= VA_EXCLUDE_START
))
139 if (filp
|| (flags
& MAP_SHARED
))
144 addr
= COLOUR_ALIGN(addr
, pgoff
);
146 addr
= PAGE_ALIGN(addr
);
148 vma
= find_vma(mm
, addr
);
149 if (task_size
- len
>= addr
&&
150 (!vma
|| addr
+ len
<= vma
->vm_start
))
154 if (len
> mm
->cached_hole_size
) {
155 start_addr
= addr
= mm
->free_area_cache
;
157 start_addr
= addr
= TASK_UNMAPPED_BASE
;
158 mm
->cached_hole_size
= 0;
165 addr
= COLOUR_ALIGN(addr
, pgoff
);
167 addr
= PAGE_ALIGN(addr
);
169 for (vma
= find_vma(mm
, addr
); ; vma
= vma
->vm_next
) {
170 /* At this point: (!vma || addr < vma->vm_end). */
171 if (addr
< VA_EXCLUDE_START
&&
172 (addr
+ len
) >= VA_EXCLUDE_START
) {
173 addr
= VA_EXCLUDE_END
;
174 vma
= find_vma(mm
, VA_EXCLUDE_END
);
176 if (unlikely(task_size
< addr
)) {
177 if (start_addr
!= TASK_UNMAPPED_BASE
) {
178 start_addr
= addr
= TASK_UNMAPPED_BASE
;
179 mm
->cached_hole_size
= 0;
184 if (likely(!vma
|| addr
+ len
<= vma
->vm_start
)) {
186 * Remember the place where we stopped the search:
188 mm
->free_area_cache
= addr
+ len
;
191 if (addr
+ mm
->cached_hole_size
< vma
->vm_start
)
192 mm
->cached_hole_size
= vma
->vm_start
- addr
;
196 addr
= COLOUR_ALIGN(addr
, pgoff
);
201 arch_get_unmapped_area_topdown(struct file
*filp
, const unsigned long addr0
,
202 const unsigned long len
, const unsigned long pgoff
,
203 const unsigned long flags
)
205 struct vm_area_struct
*vma
;
206 struct mm_struct
*mm
= current
->mm
;
207 unsigned long task_size
= STACK_TOP32
;
208 unsigned long addr
= addr0
;
211 /* This should only ever run for 32-bit processes. */
212 BUG_ON(!test_thread_flag(TIF_32BIT
));
214 if (flags
& MAP_FIXED
) {
215 /* We do not accept a shared mapping if it would violate
216 * cache aliasing constraints.
218 if ((flags
& MAP_SHARED
) &&
219 ((addr
- (pgoff
<< PAGE_SHIFT
)) & (SHMLBA
- 1)))
224 if (unlikely(len
> task_size
))
228 if (filp
|| (flags
& MAP_SHARED
))
231 /* requesting a specific address */
234 addr
= COLOUR_ALIGN(addr
, pgoff
);
236 addr
= PAGE_ALIGN(addr
);
238 vma
= find_vma(mm
, addr
);
239 if (task_size
- len
>= addr
&&
240 (!vma
|| addr
+ len
<= vma
->vm_start
))
244 /* check if free_area_cache is useful for us */
245 if (len
<= mm
->cached_hole_size
) {
246 mm
->cached_hole_size
= 0;
247 mm
->free_area_cache
= mm
->mmap_base
;
250 /* either no address requested or can't fit in requested address hole */
251 addr
= mm
->free_area_cache
;
252 if (do_color_align
) {
253 unsigned long base
= COLOUR_ALIGN_DOWN(addr
-len
, pgoff
);
258 /* make sure it can fit in the remaining address space */
259 if (likely(addr
> len
)) {
260 vma
= find_vma(mm
, addr
-len
);
261 if (!vma
|| addr
<= vma
->vm_start
) {
262 /* remember the address as a hint for next time */
263 return (mm
->free_area_cache
= addr
-len
);
267 if (unlikely(mm
->mmap_base
< len
))
270 addr
= mm
->mmap_base
-len
;
272 addr
= COLOUR_ALIGN_DOWN(addr
, pgoff
);
276 * Lookup failure means no vma is above this address,
277 * else if new region fits below vma->vm_start,
278 * return with success:
280 vma
= find_vma(mm
, addr
);
281 if (likely(!vma
|| addr
+len
<= vma
->vm_start
)) {
282 /* remember the address as a hint for next time */
283 return (mm
->free_area_cache
= addr
);
286 /* remember the largest hole we saw so far */
287 if (addr
+ mm
->cached_hole_size
< vma
->vm_start
)
288 mm
->cached_hole_size
= vma
->vm_start
- addr
;
290 /* try just below the current vma->vm_start */
291 addr
= vma
->vm_start
-len
;
293 addr
= COLOUR_ALIGN_DOWN(addr
, pgoff
);
294 } while (likely(len
< vma
->vm_start
));
298 * A failed mmap() very likely causes application failure,
299 * so fall back to the bottom-up function here. This scenario
300 * can happen with large stack limits and large mmap()
303 mm
->cached_hole_size
= ~0UL;
304 mm
->free_area_cache
= TASK_UNMAPPED_BASE
;
305 addr
= arch_get_unmapped_area(filp
, addr0
, len
, pgoff
, flags
);
307 * Restore the topdown base:
309 mm
->free_area_cache
= mm
->mmap_base
;
310 mm
->cached_hole_size
= ~0UL;
315 /* Try to align mapping such that we align it as much as possible. */
316 unsigned long get_fb_unmapped_area(struct file
*filp
, unsigned long orig_addr
, unsigned long len
, unsigned long pgoff
, unsigned long flags
)
318 unsigned long align_goal
, addr
= -ENOMEM
;
320 if (flags
& MAP_FIXED
) {
321 /* Ok, don't mess with it. */
322 return get_unmapped_area(NULL
, orig_addr
, len
, pgoff
, flags
);
324 flags
&= ~MAP_SHARED
;
326 align_goal
= PAGE_SIZE
;
327 if (len
>= (4UL * 1024 * 1024))
328 align_goal
= (4UL * 1024 * 1024);
329 else if (len
>= (512UL * 1024))
330 align_goal
= (512UL * 1024);
331 else if (len
>= (64UL * 1024))
332 align_goal
= (64UL * 1024);
335 addr
= get_unmapped_area(NULL
, orig_addr
, len
+ (align_goal
- PAGE_SIZE
), pgoff
, flags
);
336 if (!(addr
& ~PAGE_MASK
)) {
337 addr
= (addr
+ (align_goal
- 1UL)) & ~(align_goal
- 1UL);
341 if (align_goal
== (4UL * 1024 * 1024))
342 align_goal
= (512UL * 1024);
343 else if (align_goal
== (512UL * 1024))
344 align_goal
= (64UL * 1024);
346 align_goal
= PAGE_SIZE
;
347 } while ((addr
& ~PAGE_MASK
) && align_goal
> PAGE_SIZE
);
349 /* Mapping is smaller than 64K or larger areas could not
352 if (addr
& ~PAGE_MASK
)
353 addr
= get_unmapped_area(NULL
, orig_addr
, len
, pgoff
, flags
);
358 /* Essentially the same as PowerPC... */
359 void arch_pick_mmap_layout(struct mm_struct
*mm
)
361 unsigned long random_factor
= 0UL;
363 if (current
->flags
& PF_RANDOMIZE
) {
364 random_factor
= get_random_int();
365 if (test_thread_flag(TIF_32BIT
))
366 random_factor
&= ((1 * 1024 * 1024) - 1);
368 random_factor
= ((random_factor
<< PAGE_SHIFT
) &
373 * Fall back to the standard layout if the personality
374 * bit is set, or if the expected stack growth is unlimited:
376 if (!test_thread_flag(TIF_32BIT
) ||
377 (current
->personality
& ADDR_COMPAT_LAYOUT
) ||
378 current
->signal
->rlim
[RLIMIT_STACK
].rlim_cur
== RLIM_INFINITY
||
379 sysctl_legacy_va_layout
) {
380 mm
->mmap_base
= TASK_UNMAPPED_BASE
+ random_factor
;
381 mm
->get_unmapped_area
= arch_get_unmapped_area
;
382 mm
->unmap_area
= arch_unmap_area
;
384 /* We know it's 32-bit */
385 unsigned long task_size
= STACK_TOP32
;
388 gap
= current
->signal
->rlim
[RLIMIT_STACK
].rlim_cur
;
389 if (gap
< 128 * 1024 * 1024)
390 gap
= 128 * 1024 * 1024;
391 if (gap
> (task_size
/ 6 * 5))
392 gap
= (task_size
/ 6 * 5);
394 mm
->mmap_base
= PAGE_ALIGN(task_size
- gap
- random_factor
);
395 mm
->get_unmapped_area
= arch_get_unmapped_area_topdown
;
396 mm
->unmap_area
= arch_unmap_area_topdown
;
400 asmlinkage
unsigned long sparc_brk(unsigned long brk
)
402 /* People could try to be nasty and use ta 0x6d in 32bit programs */
403 if (test_thread_flag(TIF_32BIT
) && brk
>= STACK_TOP32
)
404 return current
->mm
->brk
;
406 if (unlikely(straddles_64bit_va_hole(current
->mm
->brk
, brk
)))
407 return current
->mm
->brk
;
413 * sys_pipe() is the normal C calling standard for creating
414 * a pipe. It's not the way unix traditionally does this, though.
416 asmlinkage
long sparc_pipe(struct pt_regs
*regs
)
424 regs
->u_regs
[UREG_I1
] = fd
[1];
431 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
433 * This is really horribly ugly.
436 asmlinkage
long sys_ipc(unsigned int call
, int first
, unsigned long second
,
437 unsigned long third
, void __user
*ptr
, long fifth
)
441 /* No need for backward compatibility. We can start fresh... */
442 if (call
<= SEMCTL
) {
445 err
= sys_semtimedop(first
, ptr
,
446 (unsigned)second
, NULL
);
449 err
= sys_semtimedop(first
, ptr
, (unsigned)second
,
450 (const struct timespec __user
*)
451 (unsigned long) fifth
);
454 err
= sys_semget(first
, (int)second
, (int)third
);
457 err
= sys_semctl(first
, second
,
467 if (call
<= MSGCTL
) {
470 err
= sys_msgsnd(first
, ptr
, (size_t)second
,
474 err
= sys_msgrcv(first
, ptr
, (size_t)second
, fifth
,
478 err
= sys_msgget((key_t
)first
, (int)second
);
481 err
= sys_msgctl(first
, (int)second
| IPC_64
, ptr
);
488 if (call
<= SHMCTL
) {
492 err
= do_shmat(first
, ptr
, (int)second
, &raddr
);
495 (ulong __user
*) third
))
501 err
= sys_shmdt(ptr
);
504 err
= sys_shmget(first
, (size_t)second
, (int)third
);
507 err
= sys_shmctl(first
, (int)second
| IPC_64
, ptr
);
520 asmlinkage
long sparc64_newuname(struct new_utsname __user
*name
)
522 int ret
= sys_newuname(name
);
524 if (current
->personality
== PER_LINUX32
&& !ret
) {
525 ret
= (copy_to_user(name
->machine
, "sparc\0\0", 8)
531 asmlinkage
long sparc64_personality(unsigned long personality
)
535 if (current
->personality
== PER_LINUX32
&&
536 personality
== PER_LINUX
)
537 personality
= PER_LINUX32
;
538 ret
= sys_personality(personality
);
539 if (ret
== PER_LINUX32
)
545 int sparc64_mmap_check(unsigned long addr
, unsigned long len
)
547 if (test_thread_flag(TIF_32BIT
)) {
548 if (len
>= STACK_TOP32
)
551 if (addr
> STACK_TOP32
- len
)
554 if (len
>= VA_EXCLUDE_START
)
557 if (invalid_64bit_range(addr
, len
))
564 /* Linux version of mmap */
565 asmlinkage
unsigned long sys_mmap(unsigned long addr
, unsigned long len
,
566 unsigned long prot
, unsigned long flags
, unsigned long fd
,
569 struct file
* file
= NULL
;
570 unsigned long retval
= -EBADF
;
572 if (!(flags
& MAP_ANONYMOUS
)) {
577 flags
&= ~(MAP_EXECUTABLE
| MAP_DENYWRITE
);
578 len
= PAGE_ALIGN(len
);
580 down_write(¤t
->mm
->mmap_sem
);
581 retval
= do_mmap(file
, addr
, len
, prot
, flags
, off
);
582 up_write(¤t
->mm
->mmap_sem
);
590 asmlinkage
long sys64_munmap(unsigned long addr
, size_t len
)
594 if (invalid_64bit_range(addr
, len
))
597 down_write(¤t
->mm
->mmap_sem
);
598 ret
= do_munmap(current
->mm
, addr
, len
);
599 up_write(¤t
->mm
->mmap_sem
);
603 extern unsigned long do_mremap(unsigned long addr
,
604 unsigned long old_len
, unsigned long new_len
,
605 unsigned long flags
, unsigned long new_addr
);
607 asmlinkage
unsigned long sys64_mremap(unsigned long addr
,
608 unsigned long old_len
, unsigned long new_len
,
609 unsigned long flags
, unsigned long new_addr
)
611 unsigned long ret
= -EINVAL
;
613 if (test_thread_flag(TIF_32BIT
))
615 if (unlikely(new_len
>= VA_EXCLUDE_START
))
617 if (unlikely(sparc64_mmap_check(addr
, old_len
)))
619 if (unlikely(sparc64_mmap_check(new_addr
, new_len
)))
622 down_write(¤t
->mm
->mmap_sem
);
623 ret
= do_mremap(addr
, old_len
, new_len
, flags
, new_addr
);
624 up_write(¤t
->mm
->mmap_sem
);
629 /* we come to here via sys_nis_syscall so it can setup the regs argument */
630 asmlinkage
unsigned long c_sys_nis_syscall(struct pt_regs
*regs
)
634 /* Don't make the system unusable, if someone goes stuck */
638 printk ("Unimplemented SPARC system call %ld\n",regs
->u_regs
[1]);
639 #ifdef DEBUG_UNIMP_SYSCALL
646 /* #define DEBUG_SPARC_BREAKPOINT */
648 asmlinkage
void sparc_breakpoint(struct pt_regs
*regs
)
652 if (test_thread_flag(TIF_32BIT
)) {
653 regs
->tpc
&= 0xffffffff;
654 regs
->tnpc
&= 0xffffffff;
656 #ifdef DEBUG_SPARC_BREAKPOINT
657 printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs
->tpc
, regs
->tnpc
);
659 info
.si_signo
= SIGTRAP
;
661 info
.si_code
= TRAP_BRKPT
;
662 info
.si_addr
= (void __user
*)regs
->tpc
;
664 force_sig_info(SIGTRAP
, &info
, current
);
665 #ifdef DEBUG_SPARC_BREAKPOINT
666 printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs
->tpc
, regs
->tnpc
);
670 extern void check_pending(int signum
);
672 asmlinkage
long sys_getdomainname(char __user
*name
, int len
)
681 nlen
= strlen(utsname()->domainname
) + 1;
687 if (!copy_to_user(name
, utsname()->domainname
, nlen
))
695 asmlinkage
long sys_utrap_install(utrap_entry_t type
,
696 utrap_handler_t new_p
,
697 utrap_handler_t new_d
,
698 utrap_handler_t __user
*old_p
,
699 utrap_handler_t __user
*old_d
)
701 if (type
< UT_INSTRUCTION_EXCEPTION
|| type
> UT_TRAP_INSTRUCTION_31
)
703 if (new_p
== (utrap_handler_t
)(long)UTH_NOCHANGE
) {
705 if (!current_thread_info()->utraps
) {
706 if (put_user(NULL
, old_p
))
709 if (put_user((utrap_handler_t
)(current_thread_info()->utraps
[type
]), old_p
))
714 if (put_user(NULL
, old_d
))
719 if (!current_thread_info()->utraps
) {
720 current_thread_info()->utraps
=
721 kzalloc((UT_TRAP_INSTRUCTION_31
+1)*sizeof(long), GFP_KERNEL
);
722 if (!current_thread_info()->utraps
)
724 current_thread_info()->utraps
[0] = 1;
726 if ((utrap_handler_t
)current_thread_info()->utraps
[type
] != new_p
&&
727 current_thread_info()->utraps
[0] > 1) {
728 unsigned long *p
= current_thread_info()->utraps
;
730 current_thread_info()->utraps
=
731 kmalloc((UT_TRAP_INSTRUCTION_31
+1)*sizeof(long),
733 if (!current_thread_info()->utraps
) {
734 current_thread_info()->utraps
= p
;
738 current_thread_info()->utraps
[0] = 1;
739 memcpy(current_thread_info()->utraps
+1, p
+1,
740 UT_TRAP_INSTRUCTION_31
*sizeof(long));
744 if (put_user((utrap_handler_t
)(current_thread_info()->utraps
[type
]), old_p
))
748 if (put_user(NULL
, old_d
))
751 current_thread_info()->utraps
[type
] = (long)new_p
;
756 asmlinkage
long sparc_memory_ordering(unsigned long model
,
757 struct pt_regs
*regs
)
761 regs
->tstate
= (regs
->tstate
& ~TSTATE_MM
) | (model
<< 14);
765 asmlinkage
long sys_rt_sigaction(int sig
,
766 const struct sigaction __user
*act
,
767 struct sigaction __user
*oact
,
768 void __user
*restorer
,
771 struct k_sigaction new_ka
, old_ka
;
774 /* XXX: Don't preclude handling different sized sigset_t's. */
775 if (sigsetsize
!= sizeof(sigset_t
))
779 new_ka
.ka_restorer
= restorer
;
780 if (copy_from_user(&new_ka
.sa
, act
, sizeof(*act
)))
784 ret
= do_sigaction(sig
, act
? &new_ka
: NULL
, oact
? &old_ka
: NULL
);
787 if (copy_to_user(oact
, &old_ka
.sa
, sizeof(*oact
)))
794 /* Invoked by rtrap code to update performance counters in
797 asmlinkage
void update_perfctrs(void)
799 unsigned long pic
, tmp
;
802 tmp
= (current_thread_info()->kernel_cntd0
+= (unsigned int)pic
);
803 __put_user(tmp
, current_thread_info()->user_cntd0
);
804 tmp
= (current_thread_info()->kernel_cntd1
+= (pic
>> 32));
805 __put_user(tmp
, current_thread_info()->user_cntd1
);
809 asmlinkage
long sys_perfctr(int opcode
, unsigned long arg0
, unsigned long arg1
, unsigned long arg2
)
815 current_thread_info()->pcr_reg
= arg2
;
816 current_thread_info()->user_cntd0
= (u64 __user
*) arg0
;
817 current_thread_info()->user_cntd1
= (u64 __user
*) arg1
;
818 current_thread_info()->kernel_cntd0
=
819 current_thread_info()->kernel_cntd1
= 0;
822 set_thread_flag(TIF_PERFCTR
);
827 if (test_thread_flag(TIF_PERFCTR
)) {
828 current_thread_info()->user_cntd0
=
829 current_thread_info()->user_cntd1
= NULL
;
830 current_thread_info()->pcr_reg
= 0;
832 clear_thread_flag(TIF_PERFCTR
);
838 unsigned long pic
, tmp
;
840 if (!test_thread_flag(TIF_PERFCTR
)) {
845 tmp
= (current_thread_info()->kernel_cntd0
+= (unsigned int)pic
);
846 err
|= __put_user(tmp
, current_thread_info()->user_cntd0
);
847 tmp
= (current_thread_info()->kernel_cntd1
+= (pic
>> 32));
848 err
|= __put_user(tmp
, current_thread_info()->user_cntd1
);
854 if (!test_thread_flag(TIF_PERFCTR
)) {
858 current_thread_info()->kernel_cntd0
=
859 current_thread_info()->kernel_cntd1
= 0;
863 case PERFCTR_SETPCR
: {
864 u64 __user
*user_pcr
= (u64 __user
*)arg0
;
866 if (!test_thread_flag(TIF_PERFCTR
)) {
870 err
|= __get_user(current_thread_info()->pcr_reg
, user_pcr
);
871 write_pcr(current_thread_info()->pcr_reg
);
872 current_thread_info()->kernel_cntd0
=
873 current_thread_info()->kernel_cntd1
= 0;
878 case PERFCTR_GETPCR
: {
879 u64 __user
*user_pcr
= (u64 __user
*)arg0
;
881 if (!test_thread_flag(TIF_PERFCTR
)) {
885 err
|= __put_user(current_thread_info()->pcr_reg
, user_pcr
);
897 * Do a system call from kernel instead of calling sys_execve so we
898 * end up with proper pt_regs.
900 int kernel_execve(const char *filename
, char *const argv
[], char *const envp
[])
903 register long __g1
__asm__ ("g1") = __NR_execve
;
904 register long __o0
__asm__ ("o0") = (long)(filename
);
905 register long __o1
__asm__ ("o1") = (long)(argv
);
906 register long __o2
__asm__ ("o2") = (long)(envp
);
907 asm volatile ("t 0x6d\n\t"
908 "sub %%g0, %%o0, %0\n\t"
909 "movcc %%xcc, %%o0, %0\n\t"
910 : "=r" (__res
), "=&r" (__o0
)
911 : "1" (__o0
), "r" (__o1
), "r" (__o2
), "r" (__g1
)