]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/sh64/kernel/process.c
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * arch/sh64/kernel/process.c
8 * Copyright (C) 2000, 2001 Paolo Alberelli
9 * Copyright (C) 2003 Paul Mundt
10 * Copyright (C) 2003, 2004 Richard Curnow
12 * Started from SH3/4 version:
13 * Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
15 * In turn started from i386 version:
16 * Copyright (C) 1995 Linus Torvalds
21 * This file handles the architecture-dependent parts of process handling..
24 /* Temporary flags/tests. All to be removed/undefined. BEGIN */
26 #define VM_SHOW_TABLES
28 #define VM_TEST_RTLBMISS
29 #define VM_TEST_WTLBMISS
33 /* Temporary flags/tests. All to be removed/undefined. END */
35 #define __KERNEL_SYSCALLS__
38 #include <linux/config.h>
39 #include <linux/kernel.h>
40 #include <linux/rwsem.h>
42 #include <linux/smp.h>
43 #include <linux/smp_lock.h>
44 #include <linux/ptrace.h>
45 #include <linux/slab.h>
46 #include <linux/vmalloc.h>
47 #include <linux/user.h>
48 #include <linux/a.out.h>
49 #include <linux/interrupt.h>
50 #include <linux/unistd.h>
51 #include <linux/delay.h>
52 #include <linux/reboot.h>
53 #include <linux/init.h>
55 #include <asm/uaccess.h>
56 #include <asm/pgtable.h>
57 #include <asm/system.h>
59 #include <asm/processor.h> /* includes also <asm/registers.h> */
60 #include <asm/mmu_context.h>
64 #include <linux/irq.h>
66 struct task_struct
*last_task_used_math
= NULL
;
71 static void print_PTE(long base
)
74 long long x
, y
, *p
= (long long *) base
;
76 for (i
=0; i
< 512; i
++, p
++){
85 y
= (*p
) & 0xffffffff;
86 printk("%08Lx%08Lx ", x
, y
);
87 if (!((i
+1)&0x3)) printk("\n");
93 static void print_DIR(long base
)
96 long *p
= (long *) base
;
98 for (i
=0; i
< 512; i
++, p
++){
106 printk("%08lx ", *p
);
107 if (!((i
+1)&0x7)) printk("\n");
113 static void print_vmalloc_first_tables(void)
116 #define PRESENT 0x800 /* Bit 11 */
119 * Do it really dirty by looking at raw addresses,
120 * raw offsets, no types. If we used pgtable/pgalloc
121 * macros/definitions we could hide potential bugs.
123 * Note that pointers are 32-bit for CDC.
125 long pgdt
, pmdt
, ptet
;
127 pgdt
= (long) &swapper_pg_dir
;
128 printk("-->PGD (0x%08lx):\n", pgdt
);
132 /* VMALLOC pool is mapped at 0xc0000000, second (pointer) entry in PGD */
134 pmdt
= (long) (* (long *) pgdt
);
135 if (!(pmdt
& PRESENT
)) {
138 } else pmdt
&= 0xfffff000;
140 printk("-->PMD (0x%08lx):\n", pmdt
);
144 /* Get the pmdt displacement for 0xc0000000 */
147 /* just look at first two address ranges ... */
148 /* ... 0xc0000000 ... */
149 ptet
= (long) (* (long *) pmdt
);
150 if (!(ptet
& PRESENT
)) {
153 } else ptet
&= 0xfffff000;
155 printk("-->PTE0 (0x%08lx):\n", ptet
);
159 /* ... 0xc0001000 ... */
161 if (!(ptet
& PRESENT
)) {
164 } else ptet
&= 0xfffff000;
165 printk("-->PTE1 (0x%08lx):\n", ptet
);
170 #define print_vmalloc_first_tables()
171 #endif /* VM_SHOW_TABLES */
173 static void test_VM(void)
177 #ifdef VM_SHOW_TABLES
178 printk("Initial PGD/PMD/PTE\n");
180 print_vmalloc_first_tables();
182 printk("Allocating 2 bytes\n");
184 print_vmalloc_first_tables();
186 printk("Allocating 4100 bytes\n");
188 print_vmalloc_first_tables();
190 printk("Allocating 20234 bytes\n");
192 print_vmalloc_first_tables();
195 /* Here you may want to fault ! */
197 #ifdef VM_TEST_RTLBMISS
198 printk("Ready to fault upon read.\n");
200 printk("RTLBMISSed on area a !\n");
202 printk("RTLBMISSed on area a !\n");
205 #ifdef VM_TEST_WTLBMISS
206 printk("Ready to fault upon write.\n");
208 printk("WTLBMISSed on area b !\n");
211 #endif /* VM_TEST_FAULT */
213 printk("Deallocating the 4100 byte chunk\n");
215 print_vmalloc_first_tables();
217 printk("Deallocating the 2 byte chunk\n");
219 print_vmalloc_first_tables();
221 printk("Deallocating the last chunk\n");
223 print_vmalloc_first_tables();
226 extern unsigned long volatile jiffies
;
228 unsigned long old_jiffies
;
229 int pid
= -1, pgid
= -1;
231 void idle_trace(void)
234 _syscall0(int, getpid
)
235 _syscall1(int, getpgid
, int, pid
)
238 /* VM allocation/deallocation simple test */
242 printk("Got all through to Idle !!\n");
243 printk("I'm now going to loop forever ...\n");
244 printk("Any ! below is a timer tick.\n");
245 printk("Any . below is a getpgid system call from pid = %d.\n", pid
);
248 old_jiffies
= jiffies
;
252 if (old_jiffies
!= jiffies
) {
253 old_jiffies
= jiffies
- old_jiffies
;
254 switch (old_jiffies
) {
268 printk("(%d!)", (int) old_jiffies
);
270 old_jiffies
= jiffies
;
276 #define idle_trace() do { } while (0)
277 #endif /* IDLE_TRACE */
279 static int hlt_counter
= 1;
281 #define HARD_IDLE_TIMEOUT (HZ / 3)
283 void disable_hlt(void)
288 void enable_hlt(void)
293 static int __init
nohlt_setup(char *__unused
)
299 static int __init
hlt_setup(char *__unused
)
305 __setup("nohlt", nohlt_setup
);
306 __setup("hlt", hlt_setup
);
308 static inline void hlt(void)
310 __asm__
__volatile__ ("sleep" : : : "memory");
314 * The idle loop on a uniprocessor SH..
318 /* endless idle loop with no priority at all */
321 while (!need_resched())
325 while (!need_resched()) {
333 preempt_enable_no_resched();
340 void machine_restart(char * __unused
)
342 extern void phys_stext(void);
347 void machine_halt(void)
352 void machine_power_off(void)
354 extern void enter_deep_standby(void);
356 enter_deep_standby();
359 void show_regs(struct pt_regs
* regs
)
361 unsigned long long ah
, al
, bh
, bl
, ch
, cl
;
365 ah
= (regs
->pc
) >> 32;
366 al
= (regs
->pc
) & 0xffffffff;
367 bh
= (regs
->regs
[18]) >> 32;
368 bl
= (regs
->regs
[18]) & 0xffffffff;
369 ch
= (regs
->regs
[15]) >> 32;
370 cl
= (regs
->regs
[15]) & 0xffffffff;
371 printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n",
372 ah
, al
, bh
, bl
, ch
, cl
);
374 ah
= (regs
->sr
) >> 32;
375 al
= (regs
->sr
) & 0xffffffff;
376 asm volatile ("getcon " __TEA
", %0" : "=r" (bh
));
377 asm volatile ("getcon " __TEA
", %0" : "=r" (bl
));
379 bl
= (bl
) & 0xffffffff;
380 asm volatile ("getcon " __KCR0
", %0" : "=r" (ch
));
381 asm volatile ("getcon " __KCR0
", %0" : "=r" (cl
));
383 cl
= (cl
) & 0xffffffff;
384 printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n",
385 ah
, al
, bh
, bl
, ch
, cl
);
387 ah
= (regs
->regs
[0]) >> 32;
388 al
= (regs
->regs
[0]) & 0xffffffff;
389 bh
= (regs
->regs
[1]) >> 32;
390 bl
= (regs
->regs
[1]) & 0xffffffff;
391 ch
= (regs
->regs
[2]) >> 32;
392 cl
= (regs
->regs
[2]) & 0xffffffff;
393 printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n",
394 ah
, al
, bh
, bl
, ch
, cl
);
396 ah
= (regs
->regs
[3]) >> 32;
397 al
= (regs
->regs
[3]) & 0xffffffff;
398 bh
= (regs
->regs
[4]) >> 32;
399 bl
= (regs
->regs
[4]) & 0xffffffff;
400 ch
= (regs
->regs
[5]) >> 32;
401 cl
= (regs
->regs
[5]) & 0xffffffff;
402 printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n",
403 ah
, al
, bh
, bl
, ch
, cl
);
405 ah
= (regs
->regs
[6]) >> 32;
406 al
= (regs
->regs
[6]) & 0xffffffff;
407 bh
= (regs
->regs
[7]) >> 32;
408 bl
= (regs
->regs
[7]) & 0xffffffff;
409 ch
= (regs
->regs
[8]) >> 32;
410 cl
= (regs
->regs
[8]) & 0xffffffff;
411 printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n",
412 ah
, al
, bh
, bl
, ch
, cl
);
414 ah
= (regs
->regs
[9]) >> 32;
415 al
= (regs
->regs
[9]) & 0xffffffff;
416 bh
= (regs
->regs
[10]) >> 32;
417 bl
= (regs
->regs
[10]) & 0xffffffff;
418 ch
= (regs
->regs
[11]) >> 32;
419 cl
= (regs
->regs
[11]) & 0xffffffff;
420 printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n",
421 ah
, al
, bh
, bl
, ch
, cl
);
423 ah
= (regs
->regs
[12]) >> 32;
424 al
= (regs
->regs
[12]) & 0xffffffff;
425 bh
= (regs
->regs
[13]) >> 32;
426 bl
= (regs
->regs
[13]) & 0xffffffff;
427 ch
= (regs
->regs
[14]) >> 32;
428 cl
= (regs
->regs
[14]) & 0xffffffff;
429 printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n",
430 ah
, al
, bh
, bl
, ch
, cl
);
432 ah
= (regs
->regs
[16]) >> 32;
433 al
= (regs
->regs
[16]) & 0xffffffff;
434 bh
= (regs
->regs
[17]) >> 32;
435 bl
= (regs
->regs
[17]) & 0xffffffff;
436 ch
= (regs
->regs
[19]) >> 32;
437 cl
= (regs
->regs
[19]) & 0xffffffff;
438 printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n",
439 ah
, al
, bh
, bl
, ch
, cl
);
441 ah
= (regs
->regs
[20]) >> 32;
442 al
= (regs
->regs
[20]) & 0xffffffff;
443 bh
= (regs
->regs
[21]) >> 32;
444 bl
= (regs
->regs
[21]) & 0xffffffff;
445 ch
= (regs
->regs
[22]) >> 32;
446 cl
= (regs
->regs
[22]) & 0xffffffff;
447 printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n",
448 ah
, al
, bh
, bl
, ch
, cl
);
450 ah
= (regs
->regs
[23]) >> 32;
451 al
= (regs
->regs
[23]) & 0xffffffff;
452 bh
= (regs
->regs
[24]) >> 32;
453 bl
= (regs
->regs
[24]) & 0xffffffff;
454 ch
= (regs
->regs
[25]) >> 32;
455 cl
= (regs
->regs
[25]) & 0xffffffff;
456 printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n",
457 ah
, al
, bh
, bl
, ch
, cl
);
459 ah
= (regs
->regs
[26]) >> 32;
460 al
= (regs
->regs
[26]) & 0xffffffff;
461 bh
= (regs
->regs
[27]) >> 32;
462 bl
= (regs
->regs
[27]) & 0xffffffff;
463 ch
= (regs
->regs
[28]) >> 32;
464 cl
= (regs
->regs
[28]) & 0xffffffff;
465 printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n",
466 ah
, al
, bh
, bl
, ch
, cl
);
468 ah
= (regs
->regs
[29]) >> 32;
469 al
= (regs
->regs
[29]) & 0xffffffff;
470 bh
= (regs
->regs
[30]) >> 32;
471 bl
= (regs
->regs
[30]) & 0xffffffff;
472 ch
= (regs
->regs
[31]) >> 32;
473 cl
= (regs
->regs
[31]) & 0xffffffff;
474 printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n",
475 ah
, al
, bh
, bl
, ch
, cl
);
477 ah
= (regs
->regs
[32]) >> 32;
478 al
= (regs
->regs
[32]) & 0xffffffff;
479 bh
= (regs
->regs
[33]) >> 32;
480 bl
= (regs
->regs
[33]) & 0xffffffff;
481 ch
= (regs
->regs
[34]) >> 32;
482 cl
= (regs
->regs
[34]) & 0xffffffff;
483 printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n",
484 ah
, al
, bh
, bl
, ch
, cl
);
486 ah
= (regs
->regs
[35]) >> 32;
487 al
= (regs
->regs
[35]) & 0xffffffff;
488 bh
= (regs
->regs
[36]) >> 32;
489 bl
= (regs
->regs
[36]) & 0xffffffff;
490 ch
= (regs
->regs
[37]) >> 32;
491 cl
= (regs
->regs
[37]) & 0xffffffff;
492 printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n",
493 ah
, al
, bh
, bl
, ch
, cl
);
495 ah
= (regs
->regs
[38]) >> 32;
496 al
= (regs
->regs
[38]) & 0xffffffff;
497 bh
= (regs
->regs
[39]) >> 32;
498 bl
= (regs
->regs
[39]) & 0xffffffff;
499 ch
= (regs
->regs
[40]) >> 32;
500 cl
= (regs
->regs
[40]) & 0xffffffff;
501 printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n",
502 ah
, al
, bh
, bl
, ch
, cl
);
504 ah
= (regs
->regs
[41]) >> 32;
505 al
= (regs
->regs
[41]) & 0xffffffff;
506 bh
= (regs
->regs
[42]) >> 32;
507 bl
= (regs
->regs
[42]) & 0xffffffff;
508 ch
= (regs
->regs
[43]) >> 32;
509 cl
= (regs
->regs
[43]) & 0xffffffff;
510 printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n",
511 ah
, al
, bh
, bl
, ch
, cl
);
513 ah
= (regs
->regs
[44]) >> 32;
514 al
= (regs
->regs
[44]) & 0xffffffff;
515 bh
= (regs
->regs
[45]) >> 32;
516 bl
= (regs
->regs
[45]) & 0xffffffff;
517 ch
= (regs
->regs
[46]) >> 32;
518 cl
= (regs
->regs
[46]) & 0xffffffff;
519 printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n",
520 ah
, al
, bh
, bl
, ch
, cl
);
522 ah
= (regs
->regs
[47]) >> 32;
523 al
= (regs
->regs
[47]) & 0xffffffff;
524 bh
= (regs
->regs
[48]) >> 32;
525 bl
= (regs
->regs
[48]) & 0xffffffff;
526 ch
= (regs
->regs
[49]) >> 32;
527 cl
= (regs
->regs
[49]) & 0xffffffff;
528 printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n",
529 ah
, al
, bh
, bl
, ch
, cl
);
531 ah
= (regs
->regs
[50]) >> 32;
532 al
= (regs
->regs
[50]) & 0xffffffff;
533 bh
= (regs
->regs
[51]) >> 32;
534 bl
= (regs
->regs
[51]) & 0xffffffff;
535 ch
= (regs
->regs
[52]) >> 32;
536 cl
= (regs
->regs
[52]) & 0xffffffff;
537 printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n",
538 ah
, al
, bh
, bl
, ch
, cl
);
540 ah
= (regs
->regs
[53]) >> 32;
541 al
= (regs
->regs
[53]) & 0xffffffff;
542 bh
= (regs
->regs
[54]) >> 32;
543 bl
= (regs
->regs
[54]) & 0xffffffff;
544 ch
= (regs
->regs
[55]) >> 32;
545 cl
= (regs
->regs
[55]) & 0xffffffff;
546 printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n",
547 ah
, al
, bh
, bl
, ch
, cl
);
549 ah
= (regs
->regs
[56]) >> 32;
550 al
= (regs
->regs
[56]) & 0xffffffff;
551 bh
= (regs
->regs
[57]) >> 32;
552 bl
= (regs
->regs
[57]) & 0xffffffff;
553 ch
= (regs
->regs
[58]) >> 32;
554 cl
= (regs
->regs
[58]) & 0xffffffff;
555 printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n",
556 ah
, al
, bh
, bl
, ch
, cl
);
558 ah
= (regs
->regs
[59]) >> 32;
559 al
= (regs
->regs
[59]) & 0xffffffff;
560 bh
= (regs
->regs
[60]) >> 32;
561 bl
= (regs
->regs
[60]) & 0xffffffff;
562 ch
= (regs
->regs
[61]) >> 32;
563 cl
= (regs
->regs
[61]) & 0xffffffff;
564 printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n",
565 ah
, al
, bh
, bl
, ch
, cl
);
567 ah
= (regs
->regs
[62]) >> 32;
568 al
= (regs
->regs
[62]) & 0xffffffff;
569 bh
= (regs
->tregs
[0]) >> 32;
570 bl
= (regs
->tregs
[0]) & 0xffffffff;
571 ch
= (regs
->tregs
[1]) >> 32;
572 cl
= (regs
->tregs
[1]) & 0xffffffff;
573 printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n",
574 ah
, al
, bh
, bl
, ch
, cl
);
576 ah
= (regs
->tregs
[2]) >> 32;
577 al
= (regs
->tregs
[2]) & 0xffffffff;
578 bh
= (regs
->tregs
[3]) >> 32;
579 bl
= (regs
->tregs
[3]) & 0xffffffff;
580 ch
= (regs
->tregs
[4]) >> 32;
581 cl
= (regs
->tregs
[4]) & 0xffffffff;
582 printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n",
583 ah
, al
, bh
, bl
, ch
, cl
);
585 ah
= (regs
->tregs
[5]) >> 32;
586 al
= (regs
->tregs
[5]) & 0xffffffff;
587 bh
= (regs
->tregs
[6]) >> 32;
588 bl
= (regs
->tregs
[6]) & 0xffffffff;
589 ch
= (regs
->tregs
[7]) >> 32;
590 cl
= (regs
->tregs
[7]) & 0xffffffff;
591 printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n",
592 ah
, al
, bh
, bl
, ch
, cl
);
595 * If we're in kernel mode, dump the stack too..
597 if (!user_mode(regs
)) {
598 void show_stack(struct task_struct
*tsk
, unsigned long *sp
);
599 unsigned long sp
= regs
->regs
[15] & 0xffffffff;
600 struct task_struct
*tsk
= get_current();
602 tsk
->thread
.kregs
= regs
;
604 show_stack(tsk
, (unsigned long *)sp
);
608 struct task_struct
* alloc_task_struct(void)
610 /* Get task descriptor pages */
611 return (struct task_struct
*)
612 __get_free_pages(GFP_KERNEL
, get_order(THREAD_SIZE
));
615 void free_task_struct(struct task_struct
*p
)
617 free_pages((unsigned long) p
, get_order(THREAD_SIZE
));
621 * Create a kernel thread
625 * This is the mechanism for creating a new kernel thread.
627 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
628 * who haven't done an "execve()") should use this: it will work within
629 * a system call from a "real" process, but the process memory space will
630 * not be free'd until both the parent and the child have exited.
632 int kernel_thread(int (*fn
)(void *), void * arg
, unsigned long flags
)
634 /* A bit less processor dependent than older sh ... */
637 static __inline__
_syscall2(int,clone
,unsigned long,flags
,unsigned long,newsp
)
638 static __inline__
_syscall1(int,exit
,int,ret
)
640 reply
= clone(flags
| CLONE_VM
, 0);
643 reply
= exit(fn(arg
));
650 * Free current thread data structures etc..
652 void exit_thread(void)
654 /* See arch/sparc/kernel/process.c for the precedent for doing this -- RPC.
656 The SH-5 FPU save/restore approach relies on last_task_used_math
657 pointing to a live task_struct. When another task tries to use the
658 FPU for the 1st time, the FPUDIS trap handling (see
659 arch/sh64/kernel/fpu.c) will save the existing FPU state to the
660 FP regs field within last_task_used_math before re-loading the new
661 task's FPU state (or initialising it if the FPU has been used
662 before). So if last_task_used_math is stale, and its page has already been
663 re-allocated for another use, the consequences are rather grim. Unless we
664 null it here, there is no other path through which it would get safely
668 if (last_task_used_math
== current
) {
669 last_task_used_math
= NULL
;
674 void flush_thread(void)
677 /* Called by fs/exec.c (flush_old_exec) to remove traces of a
678 * previously running executable. */
680 if (last_task_used_math
== current
) {
681 last_task_used_math
= NULL
;
683 /* Force FPU state to be reinitialised after exec */
687 /* if we are a kernel thread, about to change to user thread,
690 if(current
->thread
.kregs
==&fake_swapper_regs
) {
691 current
->thread
.kregs
=
692 ((struct pt_regs
*)(THREAD_SIZE
+ (unsigned long) current
) - 1);
693 current
->thread
.uregs
= current
->thread
.kregs
;
697 void release_thread(struct task_struct
*dead_task
)
702 /* Fill in the fpu structure for a core dump.. */
703 int dump_fpu(struct pt_regs
*regs
, elf_fpregset_t
*fpu
)
707 struct task_struct
*tsk
= current
;
709 fpvalid
= !!tsk_used_math(tsk
);
711 if (current
== last_task_used_math
) {
713 fpsave(&tsk
->thread
.fpu
.hard
);
715 last_task_used_math
= 0;
719 memcpy(fpu
, &tsk
->thread
.fpu
.hard
, sizeof(*fpu
));
724 return 0; /* Task didn't use the fpu at all. */
728 asmlinkage
void ret_from_fork(void);
730 int copy_thread(int nr
, unsigned long clone_flags
, unsigned long usp
,
731 unsigned long unused
,
732 struct task_struct
*p
, struct pt_regs
*regs
)
734 struct pt_regs
*childregs
;
735 unsigned long long se
; /* Sign extension */
738 if(last_task_used_math
== current
) {
740 fpsave(¤t
->thread
.fpu
.hard
);
742 last_task_used_math
= NULL
;
746 /* Copy from sh version */
747 childregs
= ((struct pt_regs
*)(THREAD_SIZE
+ (unsigned long) p
->thread_info
)) - 1;
751 if (user_mode(regs
)) {
752 childregs
->regs
[15] = usp
;
753 p
->thread
.uregs
= childregs
;
755 childregs
->regs
[15] = (unsigned long)p
->thread_info
+ THREAD_SIZE
;
758 childregs
->regs
[9] = 0; /* Set return value for child */
759 childregs
->sr
|= SR_FD
; /* Invalidate FPU flag */
761 p
->thread
.sp
= (unsigned long) childregs
;
762 p
->thread
.pc
= (unsigned long) ret_from_fork
;
765 * Sign extend the edited stack.
766 * Note that thread.pc and thread.pc will stay
767 * 32-bit wide and context switch must take care
768 * of NEFF sign extension.
771 se
= childregs
->regs
[15];
772 se
= (se
& NEFF_SIGN
) ? (se
| NEFF_MASK
) : se
;
773 childregs
->regs
[15] = se
;
778 asmlinkage
int sys_fork(unsigned long r2
, unsigned long r3
,
779 unsigned long r4
, unsigned long r5
,
780 unsigned long r6
, unsigned long r7
,
781 struct pt_regs
*pregs
)
783 return do_fork(SIGCHLD
, pregs
->regs
[15], pregs
, 0, 0, 0);
786 asmlinkage
int sys_clone(unsigned long clone_flags
, unsigned long newsp
,
787 unsigned long r4
, unsigned long r5
,
788 unsigned long r6
, unsigned long r7
,
789 struct pt_regs
*pregs
)
792 newsp
= pregs
->regs
[15];
793 return do_fork(clone_flags
, newsp
, pregs
, 0, 0, 0);
797 * This is trivial, and on the face of it looks like it
798 * could equally well be done in user mode.
800 * Not so, for quite unobvious reasons - register pressure.
801 * In user mode vfork() cannot have a stack frame, and if
802 * done by calling the "clone()" system call directly, you
803 * do not have enough call-clobbered registers to hold all
804 * the information you need.
806 asmlinkage
int sys_vfork(unsigned long r2
, unsigned long r3
,
807 unsigned long r4
, unsigned long r5
,
808 unsigned long r6
, unsigned long r7
,
809 struct pt_regs
*pregs
)
811 return do_fork(CLONE_VFORK
| CLONE_VM
| SIGCHLD
, pregs
->regs
[15], pregs
, 0, 0, 0);
815 * sys_execve() executes a new program.
817 asmlinkage
int sys_execve(char *ufilename
, char **uargv
,
818 char **uenvp
, unsigned long r5
,
819 unsigned long r6
, unsigned long r7
,
820 struct pt_regs
*pregs
)
826 filename
= getname((char __user
*)ufilename
);
827 error
= PTR_ERR(filename
);
828 if (IS_ERR(filename
))
831 error
= do_execve(filename
,
832 (char __user
* __user
*)uargv
,
833 (char __user
* __user
*)uenvp
,
837 current
->ptrace
&= ~PT_DTRACE
;
838 task_unlock(current
);
847 * These bracket the sleeping functions..
849 extern void interruptible_sleep_on(wait_queue_head_t
*q
);
851 #define mid_sched ((unsigned long) interruptible_sleep_on)
853 static int in_sh64_switch_to(unsigned long pc
)
855 extern char __sh64_switch_to_end
;
856 /* For a sleeping task, the PC is somewhere in the middle of the function,
857 so we don't have to worry about masking the LSB off */
858 return (pc
>= (unsigned long) sh64_switch_to
) &&
859 (pc
< (unsigned long) &__sh64_switch_to_end
);
862 unsigned long get_wchan(struct task_struct
*p
)
864 unsigned long schedule_fp
;
865 unsigned long sh64_switch_to_fp
;
866 unsigned long schedule_caller_pc
;
869 if (!p
|| p
== current
|| p
->state
== TASK_RUNNING
)
873 * The same comment as on the Alpha applies here, too ...
875 pc
= thread_saved_pc(p
);
877 #ifdef CONFIG_FRAME_POINTER
878 if (in_sh64_switch_to(pc
)) {
879 sh64_switch_to_fp
= (long) p
->thread
.sp
;
880 /* r14 is saved at offset 4 in the sh64_switch_to frame */
881 schedule_fp
= *(unsigned long *) (long)(sh64_switch_to_fp
+ 4);
883 /* and the caller of 'schedule' is (currently!) saved at offset 24
884 in the frame of schedule (from disasm) */
885 schedule_caller_pc
= *(unsigned long *) (long)(schedule_fp
+ 24);
886 return schedule_caller_pc
;
892 /* Provide a /proc/asids file that lists out the
893 ASIDs currently associated with the processes. (If the DM.PC register is
894 examined through the debug link, this shows ASID + PC. To make use of this,
895 the PID->ASID relationship needs to be known. This is primarily for
899 #if defined(CONFIG_SH64_PROC_ASIDS)
900 #include <linux/init.h>
901 #include <linux/proc_fs.h>
904 asids_proc_info(char *buf
, char **start
, off_t fpos
, int length
, int *eof
, void *data
)
907 struct task_struct
*p
;
908 read_lock(&tasklist_lock
);
909 for_each_process(p
) {
911 struct mm_struct
*mm
;
915 unsigned long asid
, context
;
916 context
= mm
->context
;
917 asid
= (context
& 0xff);
918 len
+= sprintf(buf
+len
, "%5d : %02lx\n", pid
, asid
);
920 len
+= sprintf(buf
+len
, "%5d : (none)\n", pid
);
923 read_unlock(&tasklist_lock
);
928 static int __init
register_proc_asids(void)
930 create_proc_read_entry("asids", 0, NULL
, asids_proc_info
, NULL
);
934 __initcall(register_proc_asids
);