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)
313 __asm__
__volatile__ ("sleep" : : : "memory");
317 * The idle loop on a uniprocessor SH..
319 void default_idle(void)
321 /* endless idle loop with no priority at all */
329 while (!need_resched()) {
341 void cpu_idle(void *unused
)
346 void machine_restart(char * __unused
)
348 extern void phys_stext(void);
353 void machine_halt(void)
358 void machine_power_off(void)
360 extern void enter_deep_standby(void);
362 enter_deep_standby();
365 void show_regs(struct pt_regs
* regs
)
367 unsigned long long ah
, al
, bh
, bl
, ch
, cl
;
371 ah
= (regs
->pc
) >> 32;
372 al
= (regs
->pc
) & 0xffffffff;
373 bh
= (regs
->regs
[18]) >> 32;
374 bl
= (regs
->regs
[18]) & 0xffffffff;
375 ch
= (regs
->regs
[15]) >> 32;
376 cl
= (regs
->regs
[15]) & 0xffffffff;
377 printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n",
378 ah
, al
, bh
, bl
, ch
, cl
);
380 ah
= (regs
->sr
) >> 32;
381 al
= (regs
->sr
) & 0xffffffff;
382 asm volatile ("getcon " __TEA
", %0" : "=r" (bh
));
383 asm volatile ("getcon " __TEA
", %0" : "=r" (bl
));
385 bl
= (bl
) & 0xffffffff;
386 asm volatile ("getcon " __KCR0
", %0" : "=r" (ch
));
387 asm volatile ("getcon " __KCR0
", %0" : "=r" (cl
));
389 cl
= (cl
) & 0xffffffff;
390 printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n",
391 ah
, al
, bh
, bl
, ch
, cl
);
393 ah
= (regs
->regs
[0]) >> 32;
394 al
= (regs
->regs
[0]) & 0xffffffff;
395 bh
= (regs
->regs
[1]) >> 32;
396 bl
= (regs
->regs
[1]) & 0xffffffff;
397 ch
= (regs
->regs
[2]) >> 32;
398 cl
= (regs
->regs
[2]) & 0xffffffff;
399 printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n",
400 ah
, al
, bh
, bl
, ch
, cl
);
402 ah
= (regs
->regs
[3]) >> 32;
403 al
= (regs
->regs
[3]) & 0xffffffff;
404 bh
= (regs
->regs
[4]) >> 32;
405 bl
= (regs
->regs
[4]) & 0xffffffff;
406 ch
= (regs
->regs
[5]) >> 32;
407 cl
= (regs
->regs
[5]) & 0xffffffff;
408 printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n",
409 ah
, al
, bh
, bl
, ch
, cl
);
411 ah
= (regs
->regs
[6]) >> 32;
412 al
= (regs
->regs
[6]) & 0xffffffff;
413 bh
= (regs
->regs
[7]) >> 32;
414 bl
= (regs
->regs
[7]) & 0xffffffff;
415 ch
= (regs
->regs
[8]) >> 32;
416 cl
= (regs
->regs
[8]) & 0xffffffff;
417 printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n",
418 ah
, al
, bh
, bl
, ch
, cl
);
420 ah
= (regs
->regs
[9]) >> 32;
421 al
= (regs
->regs
[9]) & 0xffffffff;
422 bh
= (regs
->regs
[10]) >> 32;
423 bl
= (regs
->regs
[10]) & 0xffffffff;
424 ch
= (regs
->regs
[11]) >> 32;
425 cl
= (regs
->regs
[11]) & 0xffffffff;
426 printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n",
427 ah
, al
, bh
, bl
, ch
, cl
);
429 ah
= (regs
->regs
[12]) >> 32;
430 al
= (regs
->regs
[12]) & 0xffffffff;
431 bh
= (regs
->regs
[13]) >> 32;
432 bl
= (regs
->regs
[13]) & 0xffffffff;
433 ch
= (regs
->regs
[14]) >> 32;
434 cl
= (regs
->regs
[14]) & 0xffffffff;
435 printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n",
436 ah
, al
, bh
, bl
, ch
, cl
);
438 ah
= (regs
->regs
[16]) >> 32;
439 al
= (regs
->regs
[16]) & 0xffffffff;
440 bh
= (regs
->regs
[17]) >> 32;
441 bl
= (regs
->regs
[17]) & 0xffffffff;
442 ch
= (regs
->regs
[19]) >> 32;
443 cl
= (regs
->regs
[19]) & 0xffffffff;
444 printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n",
445 ah
, al
, bh
, bl
, ch
, cl
);
447 ah
= (regs
->regs
[20]) >> 32;
448 al
= (regs
->regs
[20]) & 0xffffffff;
449 bh
= (regs
->regs
[21]) >> 32;
450 bl
= (regs
->regs
[21]) & 0xffffffff;
451 ch
= (regs
->regs
[22]) >> 32;
452 cl
= (regs
->regs
[22]) & 0xffffffff;
453 printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n",
454 ah
, al
, bh
, bl
, ch
, cl
);
456 ah
= (regs
->regs
[23]) >> 32;
457 al
= (regs
->regs
[23]) & 0xffffffff;
458 bh
= (regs
->regs
[24]) >> 32;
459 bl
= (regs
->regs
[24]) & 0xffffffff;
460 ch
= (regs
->regs
[25]) >> 32;
461 cl
= (regs
->regs
[25]) & 0xffffffff;
462 printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n",
463 ah
, al
, bh
, bl
, ch
, cl
);
465 ah
= (regs
->regs
[26]) >> 32;
466 al
= (regs
->regs
[26]) & 0xffffffff;
467 bh
= (regs
->regs
[27]) >> 32;
468 bl
= (regs
->regs
[27]) & 0xffffffff;
469 ch
= (regs
->regs
[28]) >> 32;
470 cl
= (regs
->regs
[28]) & 0xffffffff;
471 printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n",
472 ah
, al
, bh
, bl
, ch
, cl
);
474 ah
= (regs
->regs
[29]) >> 32;
475 al
= (regs
->regs
[29]) & 0xffffffff;
476 bh
= (regs
->regs
[30]) >> 32;
477 bl
= (regs
->regs
[30]) & 0xffffffff;
478 ch
= (regs
->regs
[31]) >> 32;
479 cl
= (regs
->regs
[31]) & 0xffffffff;
480 printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n",
481 ah
, al
, bh
, bl
, ch
, cl
);
483 ah
= (regs
->regs
[32]) >> 32;
484 al
= (regs
->regs
[32]) & 0xffffffff;
485 bh
= (regs
->regs
[33]) >> 32;
486 bl
= (regs
->regs
[33]) & 0xffffffff;
487 ch
= (regs
->regs
[34]) >> 32;
488 cl
= (regs
->regs
[34]) & 0xffffffff;
489 printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n",
490 ah
, al
, bh
, bl
, ch
, cl
);
492 ah
= (regs
->regs
[35]) >> 32;
493 al
= (regs
->regs
[35]) & 0xffffffff;
494 bh
= (regs
->regs
[36]) >> 32;
495 bl
= (regs
->regs
[36]) & 0xffffffff;
496 ch
= (regs
->regs
[37]) >> 32;
497 cl
= (regs
->regs
[37]) & 0xffffffff;
498 printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n",
499 ah
, al
, bh
, bl
, ch
, cl
);
501 ah
= (regs
->regs
[38]) >> 32;
502 al
= (regs
->regs
[38]) & 0xffffffff;
503 bh
= (regs
->regs
[39]) >> 32;
504 bl
= (regs
->regs
[39]) & 0xffffffff;
505 ch
= (regs
->regs
[40]) >> 32;
506 cl
= (regs
->regs
[40]) & 0xffffffff;
507 printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n",
508 ah
, al
, bh
, bl
, ch
, cl
);
510 ah
= (regs
->regs
[41]) >> 32;
511 al
= (regs
->regs
[41]) & 0xffffffff;
512 bh
= (regs
->regs
[42]) >> 32;
513 bl
= (regs
->regs
[42]) & 0xffffffff;
514 ch
= (regs
->regs
[43]) >> 32;
515 cl
= (regs
->regs
[43]) & 0xffffffff;
516 printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n",
517 ah
, al
, bh
, bl
, ch
, cl
);
519 ah
= (regs
->regs
[44]) >> 32;
520 al
= (regs
->regs
[44]) & 0xffffffff;
521 bh
= (regs
->regs
[45]) >> 32;
522 bl
= (regs
->regs
[45]) & 0xffffffff;
523 ch
= (regs
->regs
[46]) >> 32;
524 cl
= (regs
->regs
[46]) & 0xffffffff;
525 printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n",
526 ah
, al
, bh
, bl
, ch
, cl
);
528 ah
= (regs
->regs
[47]) >> 32;
529 al
= (regs
->regs
[47]) & 0xffffffff;
530 bh
= (regs
->regs
[48]) >> 32;
531 bl
= (regs
->regs
[48]) & 0xffffffff;
532 ch
= (regs
->regs
[49]) >> 32;
533 cl
= (regs
->regs
[49]) & 0xffffffff;
534 printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n",
535 ah
, al
, bh
, bl
, ch
, cl
);
537 ah
= (regs
->regs
[50]) >> 32;
538 al
= (regs
->regs
[50]) & 0xffffffff;
539 bh
= (regs
->regs
[51]) >> 32;
540 bl
= (regs
->regs
[51]) & 0xffffffff;
541 ch
= (regs
->regs
[52]) >> 32;
542 cl
= (regs
->regs
[52]) & 0xffffffff;
543 printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n",
544 ah
, al
, bh
, bl
, ch
, cl
);
546 ah
= (regs
->regs
[53]) >> 32;
547 al
= (regs
->regs
[53]) & 0xffffffff;
548 bh
= (regs
->regs
[54]) >> 32;
549 bl
= (regs
->regs
[54]) & 0xffffffff;
550 ch
= (regs
->regs
[55]) >> 32;
551 cl
= (regs
->regs
[55]) & 0xffffffff;
552 printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n",
553 ah
, al
, bh
, bl
, ch
, cl
);
555 ah
= (regs
->regs
[56]) >> 32;
556 al
= (regs
->regs
[56]) & 0xffffffff;
557 bh
= (regs
->regs
[57]) >> 32;
558 bl
= (regs
->regs
[57]) & 0xffffffff;
559 ch
= (regs
->regs
[58]) >> 32;
560 cl
= (regs
->regs
[58]) & 0xffffffff;
561 printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n",
562 ah
, al
, bh
, bl
, ch
, cl
);
564 ah
= (regs
->regs
[59]) >> 32;
565 al
= (regs
->regs
[59]) & 0xffffffff;
566 bh
= (regs
->regs
[60]) >> 32;
567 bl
= (regs
->regs
[60]) & 0xffffffff;
568 ch
= (regs
->regs
[61]) >> 32;
569 cl
= (regs
->regs
[61]) & 0xffffffff;
570 printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n",
571 ah
, al
, bh
, bl
, ch
, cl
);
573 ah
= (regs
->regs
[62]) >> 32;
574 al
= (regs
->regs
[62]) & 0xffffffff;
575 bh
= (regs
->tregs
[0]) >> 32;
576 bl
= (regs
->tregs
[0]) & 0xffffffff;
577 ch
= (regs
->tregs
[1]) >> 32;
578 cl
= (regs
->tregs
[1]) & 0xffffffff;
579 printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n",
580 ah
, al
, bh
, bl
, ch
, cl
);
582 ah
= (regs
->tregs
[2]) >> 32;
583 al
= (regs
->tregs
[2]) & 0xffffffff;
584 bh
= (regs
->tregs
[3]) >> 32;
585 bl
= (regs
->tregs
[3]) & 0xffffffff;
586 ch
= (regs
->tregs
[4]) >> 32;
587 cl
= (regs
->tregs
[4]) & 0xffffffff;
588 printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n",
589 ah
, al
, bh
, bl
, ch
, cl
);
591 ah
= (regs
->tregs
[5]) >> 32;
592 al
= (regs
->tregs
[5]) & 0xffffffff;
593 bh
= (regs
->tregs
[6]) >> 32;
594 bl
= (regs
->tregs
[6]) & 0xffffffff;
595 ch
= (regs
->tregs
[7]) >> 32;
596 cl
= (regs
->tregs
[7]) & 0xffffffff;
597 printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n",
598 ah
, al
, bh
, bl
, ch
, cl
);
601 * If we're in kernel mode, dump the stack too..
603 if (!user_mode(regs
)) {
604 void show_stack(struct task_struct
*tsk
, unsigned long *sp
);
605 unsigned long sp
= regs
->regs
[15] & 0xffffffff;
606 struct task_struct
*tsk
= get_current();
608 tsk
->thread
.kregs
= regs
;
610 show_stack(tsk
, (unsigned long *)sp
);
614 struct task_struct
* alloc_task_struct(void)
616 /* Get task descriptor pages */
617 return (struct task_struct
*)
618 __get_free_pages(GFP_KERNEL
, get_order(THREAD_SIZE
));
621 void free_task_struct(struct task_struct
*p
)
623 free_pages((unsigned long) p
, get_order(THREAD_SIZE
));
627 * Create a kernel thread
631 * This is the mechanism for creating a new kernel thread.
633 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
634 * who haven't done an "execve()") should use this: it will work within
635 * a system call from a "real" process, but the process memory space will
636 * not be free'd until both the parent and the child have exited.
638 int kernel_thread(int (*fn
)(void *), void * arg
, unsigned long flags
)
640 /* A bit less processor dependent than older sh ... */
644 static __inline__
_syscall2(int,clone
,unsigned long,flags
,unsigned long,newsp
)
645 static __inline__
_syscall1(int,exit
,int,ret
)
647 reply
= clone(flags
| CLONE_VM
, 0);
650 reply
= exit(fn(arg
));
657 * Free current thread data structures etc..
659 void exit_thread(void)
661 /* See arch/sparc/kernel/process.c for the precedent for doing this -- RPC.
663 The SH-5 FPU save/restore approach relies on last_task_used_math
664 pointing to a live task_struct. When another task tries to use the
665 FPU for the 1st time, the FPUDIS trap handling (see
666 arch/sh64/kernel/fpu.c) will save the existing FPU state to the
667 FP regs field within last_task_used_math before re-loading the new
668 task's FPU state (or initialising it if the FPU has been used
669 before). So if last_task_used_math is stale, and its page has already been
670 re-allocated for another use, the consequences are rather grim. Unless we
671 null it here, there is no other path through which it would get safely
674 #ifndef CONFIG_NOFPU_SUPPORT
675 if (last_task_used_math
== current
) {
676 last_task_used_math
= NULL
;
681 void flush_thread(void)
684 /* Called by fs/exec.c (flush_old_exec) to remove traces of a
685 * previously running executable. */
686 #ifndef CONFIG_NOFPU_SUPPORT
687 if (last_task_used_math
== current
) {
688 last_task_used_math
= NULL
;
690 /* Force FPU state to be reinitialised after exec */
691 current
->used_math
= 0;
694 /* if we are a kernel thread, about to change to user thread,
697 if(current
->thread
.kregs
==&fake_swapper_regs
) {
698 current
->thread
.kregs
=
699 ((struct pt_regs
*)(THREAD_SIZE
+ (unsigned long) current
) - 1);
700 current
->thread
.uregs
= current
->thread
.kregs
;
704 void release_thread(struct task_struct
*dead_task
)
709 /* Fill in the fpu structure for a core dump.. */
710 int dump_fpu(struct pt_regs
*regs
, elf_fpregset_t
*fpu
)
712 #ifndef CONFIG_NOFPU_SUPPORT
714 struct task_struct
*tsk
= current
;
716 fpvalid
= tsk
->used_math
;
718 if (current
== last_task_used_math
) {
720 fpsave(&tsk
->thread
.fpu
.hard
);
722 last_task_used_math
= 0;
726 memcpy(fpu
, &tsk
->thread
.fpu
.hard
, sizeof(*fpu
));
731 return 0; /* Task didn't use the fpu at all. */
735 asmlinkage
void ret_from_fork(void);
737 int copy_thread(int nr
, unsigned long clone_flags
, unsigned long usp
,
738 unsigned long unused
,
739 struct task_struct
*p
, struct pt_regs
*regs
)
741 struct pt_regs
*childregs
;
742 unsigned long long se
; /* Sign extension */
744 #ifndef CONFIG_NOFPU_SUPPORT
745 if(last_task_used_math
== current
) {
747 fpsave(¤t
->thread
.fpu
.hard
);
749 last_task_used_math
= NULL
;
753 /* Copy from sh version */
754 childregs
= ((struct pt_regs
*)(THREAD_SIZE
+ (unsigned long) p
->thread_info
)) - 1;
758 if (user_mode(regs
)) {
759 childregs
->regs
[15] = usp
;
760 p
->thread
.uregs
= childregs
;
762 childregs
->regs
[15] = (unsigned long)p
->thread_info
+ THREAD_SIZE
;
765 childregs
->regs
[9] = 0; /* Set return value for child */
766 childregs
->sr
|= SR_FD
; /* Invalidate FPU flag */
769 p
->set_child_tid
= p
->clear_child_tid
= NULL
;
771 p
->thread
.sp
= (unsigned long) childregs
;
772 p
->thread
.pc
= (unsigned long) ret_from_fork
;
775 * Sign extend the edited stack.
776 * Note that thread.pc and thread.pc will stay
777 * 32-bit wide and context switch must take care
778 * of NEFF sign extension.
781 se
= childregs
->regs
[15];
782 se
= (se
& NEFF_SIGN
) ? (se
| NEFF_MASK
) : se
;
783 childregs
->regs
[15] = se
;
789 * fill in the user structure for a core dump..
791 void dump_thread(struct pt_regs
* regs
, struct user
* dump
)
793 dump
->magic
= CMAGIC
;
794 dump
->start_code
= current
->mm
->start_code
;
795 dump
->start_data
= current
->mm
->start_data
;
796 dump
->start_stack
= regs
->regs
[15] & ~(PAGE_SIZE
- 1);
797 dump
->u_tsize
= (current
->mm
->end_code
- dump
->start_code
) >> PAGE_SHIFT
;
798 dump
->u_dsize
= (current
->mm
->brk
+ (PAGE_SIZE
-1) - dump
->start_data
) >> PAGE_SHIFT
;
799 dump
->u_ssize
= (current
->mm
->start_stack
- dump
->start_stack
+
800 PAGE_SIZE
- 1) >> PAGE_SHIFT
;
801 /* Debug registers will come here. */
805 dump
->u_fpvalid
= dump_fpu(regs
, &dump
->fpu
);
808 asmlinkage
int sys_fork(unsigned long r2
, unsigned long r3
,
809 unsigned long r4
, unsigned long r5
,
810 unsigned long r6
, unsigned long r7
,
811 struct pt_regs
*pregs
)
813 return do_fork(SIGCHLD
, pregs
->regs
[15], pregs
, 0, 0, 0);
816 asmlinkage
int sys_clone(unsigned long clone_flags
, unsigned long newsp
,
817 unsigned long r4
, unsigned long r5
,
818 unsigned long r6
, unsigned long r7
,
819 struct pt_regs
*pregs
)
822 newsp
= pregs
->regs
[15];
823 return do_fork(clone_flags
, newsp
, pregs
, 0, 0, 0);
827 * This is trivial, and on the face of it looks like it
828 * could equally well be done in user mode.
830 * Not so, for quite unobvious reasons - register pressure.
831 * In user mode vfork() cannot have a stack frame, and if
832 * done by calling the "clone()" system call directly, you
833 * do not have enough call-clobbered registers to hold all
834 * the information you need.
836 asmlinkage
int sys_vfork(unsigned long r2
, unsigned long r3
,
837 unsigned long r4
, unsigned long r5
,
838 unsigned long r6
, unsigned long r7
,
839 struct pt_regs
*pregs
)
841 return do_fork(CLONE_VFORK
| CLONE_VM
| SIGCHLD
, pregs
->regs
[15], pregs
, 0, 0, 0);
845 * sys_execve() executes a new program.
847 asmlinkage
int sys_execve(char *ufilename
, char **uargv
,
848 char **uenvp
, unsigned long r5
,
849 unsigned long r6
, unsigned long r7
,
850 struct pt_regs
*pregs
)
856 filename
= getname((char __user
*)ufilename
);
857 error
= PTR_ERR(filename
);
858 if (IS_ERR(filename
))
861 error
= do_execve(filename
,
862 (char __user
* __user
*)uargv
,
863 (char __user
* __user
*)uenvp
,
866 current
->ptrace
&= ~PT_DTRACE
;
874 * These bracket the sleeping functions..
876 extern void interruptible_sleep_on(wait_queue_head_t
*q
);
878 #define mid_sched ((unsigned long) interruptible_sleep_on)
880 static int in_sh64_switch_to(unsigned long pc
)
882 extern char __sh64_switch_to_end
;
883 /* For a sleeping task, the PC is somewhere in the middle of the function,
884 so we don't have to worry about masking the LSB off */
885 return (pc
>= (unsigned long) sh64_switch_to
) &&
886 (pc
< (unsigned long) &__sh64_switch_to_end
);
889 unsigned long get_wchan(struct task_struct
*p
)
891 unsigned long schedule_fp
;
892 unsigned long sh64_switch_to_fp
;
893 unsigned long schedule_caller_pc
;
896 if (!p
|| p
== current
|| p
->state
== TASK_RUNNING
)
900 * The same comment as on the Alpha applies here, too ...
902 pc
= thread_saved_pc(p
);
904 #ifdef CONFIG_FRAME_POINTER
905 if (in_sh64_switch_to(pc
)) {
906 sh64_switch_to_fp
= (long) p
->thread
.sp
;
907 /* r14 is saved at offset 4 in the sh64_switch_to frame */
908 schedule_fp
= *(unsigned long *) (long)(sh64_switch_to_fp
+ 4);
910 /* and the caller of 'schedule' is (currently!) saved at offset 24
911 in the frame of schedule (from disasm) */
912 schedule_caller_pc
= *(unsigned long *) (long)(schedule_fp
+ 24);
913 return schedule_caller_pc
;
919 /* Provide a /proc/asids file that lists out the
920 ASIDs currently associated with the processes. (If the DM.PC register is
921 examined through the debug link, this shows ASID + PC. To make use of this,
922 the PID->ASID relationship needs to be known. This is primarily for
926 #if defined(CONFIG_SH64_PROC_ASIDS)
927 #include <linux/init.h>
928 #include <linux/proc_fs.h>
931 asids_proc_info(char *buf
, char **start
, off_t fpos
, int length
, int *eof
, void *data
)
934 struct task_struct
*p
;
935 read_lock(&tasklist_lock
);
938 struct mm_struct
*mm
;
942 unsigned long asid
, context
;
943 context
= mm
->context
;
944 asid
= (context
& 0xff);
945 len
+= sprintf(buf
+len
, "%5d : %02x\n", pid
, asid
);
947 len
+= sprintf(buf
+len
, "%5d : (none)\n", pid
);
950 read_unlock(&tasklist_lock
);
955 static int __init
register_proc_asids(void)
957 create_proc_read_entry("asids", 0, NULL
, asids_proc_info
, NULL
);
961 __initcall(register_proc_asids
);