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1da177e4 LT |
1 | /* |
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 | |
4 | * for more details. | |
5 | * | |
6 | * arch/sh64/kernel/process.c | |
7 | * | |
8 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
9 | * Copyright (C) 2003 Paul Mundt | |
10 | * Copyright (C) 2003, 2004 Richard Curnow | |
11 | * | |
12 | * Started from SH3/4 version: | |
13 | * Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima | |
14 | * | |
15 | * In turn started from i386 version: | |
16 | * Copyright (C) 1995 Linus Torvalds | |
17 | * | |
18 | */ | |
19 | ||
20 | /* | |
21 | * This file handles the architecture-dependent parts of process handling.. | |
22 | */ | |
23 | ||
24 | /* Temporary flags/tests. All to be removed/undefined. BEGIN */ | |
25 | #define IDLE_TRACE | |
26 | #define VM_SHOW_TABLES | |
27 | #define VM_TEST_FAULT | |
28 | #define VM_TEST_RTLBMISS | |
29 | #define VM_TEST_WTLBMISS | |
30 | ||
31 | #undef VM_SHOW_TABLES | |
32 | #undef IDLE_TRACE | |
33 | /* Temporary flags/tests. All to be removed/undefined. END */ | |
34 | ||
35 | #define __KERNEL_SYSCALLS__ | |
36 | #include <stdarg.h> | |
37 | ||
38 | #include <linux/config.h> | |
39 | #include <linux/kernel.h> | |
40 | #include <linux/rwsem.h> | |
41 | #include <linux/mm.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> | |
54 | ||
55 | #include <asm/uaccess.h> | |
56 | #include <asm/pgtable.h> | |
57 | #include <asm/system.h> | |
58 | #include <asm/io.h> | |
59 | #include <asm/processor.h> /* includes also <asm/registers.h> */ | |
60 | #include <asm/mmu_context.h> | |
61 | #include <asm/elf.h> | |
62 | #include <asm/page.h> | |
63 | ||
64 | #include <linux/irq.h> | |
65 | ||
66 | struct task_struct *last_task_used_math = NULL; | |
67 | ||
68 | #ifdef IDLE_TRACE | |
69 | #ifdef VM_SHOW_TABLES | |
70 | /* For testing */ | |
71 | static void print_PTE(long base) | |
72 | { | |
73 | int i, skip=0; | |
74 | long long x, y, *p = (long long *) base; | |
75 | ||
76 | for (i=0; i< 512; i++, p++){ | |
77 | if (*p == 0) { | |
78 | if (!skip) { | |
79 | skip++; | |
80 | printk("(0s) "); | |
81 | } | |
82 | } else { | |
83 | skip=0; | |
84 | x = (*p) >> 32; | |
85 | y = (*p) & 0xffffffff; | |
86 | printk("%08Lx%08Lx ", x, y); | |
87 | if (!((i+1)&0x3)) printk("\n"); | |
88 | } | |
89 | } | |
90 | } | |
91 | ||
92 | /* For testing */ | |
93 | static void print_DIR(long base) | |
94 | { | |
95 | int i, skip=0; | |
96 | long *p = (long *) base; | |
97 | ||
98 | for (i=0; i< 512; i++, p++){ | |
99 | if (*p == 0) { | |
100 | if (!skip) { | |
101 | skip++; | |
102 | printk("(0s) "); | |
103 | } | |
104 | } else { | |
105 | skip=0; | |
106 | printk("%08lx ", *p); | |
107 | if (!((i+1)&0x7)) printk("\n"); | |
108 | } | |
109 | } | |
110 | } | |
111 | ||
112 | /* For testing */ | |
113 | static void print_vmalloc_first_tables(void) | |
114 | { | |
115 | ||
116 | #define PRESENT 0x800 /* Bit 11 */ | |
117 | ||
118 | /* | |
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. | |
122 | * | |
123 | * Note that pointers are 32-bit for CDC. | |
124 | */ | |
125 | long pgdt, pmdt, ptet; | |
126 | ||
127 | pgdt = (long) &swapper_pg_dir; | |
128 | printk("-->PGD (0x%08lx):\n", pgdt); | |
129 | print_DIR(pgdt); | |
130 | printk("\n"); | |
131 | ||
132 | /* VMALLOC pool is mapped at 0xc0000000, second (pointer) entry in PGD */ | |
133 | pgdt += 4; | |
134 | pmdt = (long) (* (long *) pgdt); | |
135 | if (!(pmdt & PRESENT)) { | |
136 | printk("No PMD\n"); | |
137 | return; | |
138 | } else pmdt &= 0xfffff000; | |
139 | ||
140 | printk("-->PMD (0x%08lx):\n", pmdt); | |
141 | print_DIR(pmdt); | |
142 | printk("\n"); | |
143 | ||
144 | /* Get the pmdt displacement for 0xc0000000 */ | |
145 | pmdt += 2048; | |
146 | ||
147 | /* just look at first two address ranges ... */ | |
148 | /* ... 0xc0000000 ... */ | |
149 | ptet = (long) (* (long *) pmdt); | |
150 | if (!(ptet & PRESENT)) { | |
151 | printk("No PTE0\n"); | |
152 | return; | |
153 | } else ptet &= 0xfffff000; | |
154 | ||
155 | printk("-->PTE0 (0x%08lx):\n", ptet); | |
156 | print_PTE(ptet); | |
157 | printk("\n"); | |
158 | ||
159 | /* ... 0xc0001000 ... */ | |
160 | ptet += 4; | |
161 | if (!(ptet & PRESENT)) { | |
162 | printk("No PTE1\n"); | |
163 | return; | |
164 | } else ptet &= 0xfffff000; | |
165 | printk("-->PTE1 (0x%08lx):\n", ptet); | |
166 | print_PTE(ptet); | |
167 | printk("\n"); | |
168 | } | |
169 | #else | |
170 | #define print_vmalloc_first_tables() | |
171 | #endif /* VM_SHOW_TABLES */ | |
172 | ||
173 | static void test_VM(void) | |
174 | { | |
175 | void *a, *b, *c; | |
176 | ||
177 | #ifdef VM_SHOW_TABLES | |
178 | printk("Initial PGD/PMD/PTE\n"); | |
179 | #endif | |
180 | print_vmalloc_first_tables(); | |
181 | ||
182 | printk("Allocating 2 bytes\n"); | |
183 | a = vmalloc(2); | |
184 | print_vmalloc_first_tables(); | |
185 | ||
186 | printk("Allocating 4100 bytes\n"); | |
187 | b = vmalloc(4100); | |
188 | print_vmalloc_first_tables(); | |
189 | ||
190 | printk("Allocating 20234 bytes\n"); | |
191 | c = vmalloc(20234); | |
192 | print_vmalloc_first_tables(); | |
193 | ||
194 | #ifdef VM_TEST_FAULT | |
195 | /* Here you may want to fault ! */ | |
196 | ||
197 | #ifdef VM_TEST_RTLBMISS | |
198 | printk("Ready to fault upon read.\n"); | |
199 | if (* (char *) a) { | |
200 | printk("RTLBMISSed on area a !\n"); | |
201 | } | |
202 | printk("RTLBMISSed on area a !\n"); | |
203 | #endif | |
204 | ||
205 | #ifdef VM_TEST_WTLBMISS | |
206 | printk("Ready to fault upon write.\n"); | |
207 | *((char *) b) = 'L'; | |
208 | printk("WTLBMISSed on area b !\n"); | |
209 | #endif | |
210 | ||
211 | #endif /* VM_TEST_FAULT */ | |
212 | ||
213 | printk("Deallocating the 4100 byte chunk\n"); | |
214 | vfree(b); | |
215 | print_vmalloc_first_tables(); | |
216 | ||
217 | printk("Deallocating the 2 byte chunk\n"); | |
218 | vfree(a); | |
219 | print_vmalloc_first_tables(); | |
220 | ||
221 | printk("Deallocating the last chunk\n"); | |
222 | vfree(c); | |
223 | print_vmalloc_first_tables(); | |
224 | } | |
225 | ||
226 | extern unsigned long volatile jiffies; | |
227 | int once = 0; | |
228 | unsigned long old_jiffies; | |
229 | int pid = -1, pgid = -1; | |
230 | ||
231 | void idle_trace(void) | |
232 | { | |
233 | ||
234 | _syscall0(int, getpid) | |
235 | _syscall1(int, getpgid, int, pid) | |
236 | ||
237 | if (!once) { | |
238 | /* VM allocation/deallocation simple test */ | |
239 | test_VM(); | |
240 | pid = getpid(); | |
241 | ||
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); | |
246 | ||
247 | ||
248 | old_jiffies = jiffies; | |
249 | once++; | |
250 | } | |
251 | ||
252 | if (old_jiffies != jiffies) { | |
253 | old_jiffies = jiffies - old_jiffies; | |
254 | switch (old_jiffies) { | |
255 | case 1: | |
256 | printk("!"); | |
257 | break; | |
258 | case 2: | |
259 | printk("!!"); | |
260 | break; | |
261 | case 3: | |
262 | printk("!!!"); | |
263 | break; | |
264 | case 4: | |
265 | printk("!!!!"); | |
266 | break; | |
267 | default: | |
268 | printk("(%d!)", (int) old_jiffies); | |
269 | } | |
270 | old_jiffies = jiffies; | |
271 | } | |
272 | pgid = getpgid(pid); | |
273 | printk("."); | |
274 | } | |
275 | #else | |
276 | #define idle_trace() do { } while (0) | |
277 | #endif /* IDLE_TRACE */ | |
278 | ||
279 | static int hlt_counter = 1; | |
280 | ||
281 | #define HARD_IDLE_TIMEOUT (HZ / 3) | |
282 | ||
283 | void disable_hlt(void) | |
284 | { | |
285 | hlt_counter++; | |
286 | } | |
287 | ||
288 | void enable_hlt(void) | |
289 | { | |
290 | hlt_counter--; | |
291 | } | |
292 | ||
293 | static int __init nohlt_setup(char *__unused) | |
294 | { | |
295 | hlt_counter = 1; | |
296 | return 1; | |
297 | } | |
298 | ||
299 | static int __init hlt_setup(char *__unused) | |
300 | { | |
301 | hlt_counter = 0; | |
302 | return 1; | |
303 | } | |
304 | ||
305 | __setup("nohlt", nohlt_setup); | |
306 | __setup("hlt", hlt_setup); | |
307 | ||
308 | static inline void hlt(void) | |
309 | { | |
310 | if (hlt_counter) | |
311 | return; | |
312 | ||
313 | __asm__ __volatile__ ("sleep" : : : "memory"); | |
314 | } | |
315 | ||
316 | /* | |
317 | * The idle loop on a uniprocessor SH.. | |
318 | */ | |
319 | void default_idle(void) | |
320 | { | |
321 | /* endless idle loop with no priority at all */ | |
322 | while (1) { | |
323 | if (hlt_counter) { | |
324 | while (1) | |
325 | if (need_resched()) | |
326 | break; | |
327 | } else { | |
328 | local_irq_disable(); | |
329 | while (!need_resched()) { | |
330 | local_irq_enable(); | |
331 | idle_trace(); | |
332 | hlt(); | |
333 | local_irq_disable(); | |
334 | } | |
335 | local_irq_enable(); | |
336 | } | |
337 | schedule(); | |
338 | } | |
339 | } | |
340 | ||
341 | void cpu_idle(void) | |
342 | { | |
343 | default_idle(); | |
344 | } | |
345 | ||
346 | void machine_restart(char * __unused) | |
347 | { | |
348 | extern void phys_stext(void); | |
349 | ||
350 | phys_stext(); | |
351 | } | |
352 | ||
353 | void machine_halt(void) | |
354 | { | |
355 | for (;;); | |
356 | } | |
357 | ||
358 | void machine_power_off(void) | |
359 | { | |
360 | extern void enter_deep_standby(void); | |
361 | ||
362 | enter_deep_standby(); | |
363 | } | |
364 | ||
365 | void show_regs(struct pt_regs * regs) | |
366 | { | |
367 | unsigned long long ah, al, bh, bl, ch, cl; | |
368 | ||
369 | printk("\n"); | |
370 | ||
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); | |
379 | ||
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)); | |
384 | bh = (bh) >> 32; | |
385 | bl = (bl) & 0xffffffff; | |
386 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch)); | |
387 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl)); | |
388 | ch = (ch) >> 32; | |
389 | cl = (cl) & 0xffffffff; | |
390 | printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n", | |
391 | ah, al, bh, bl, ch, cl); | |
392 | ||
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); | |
401 | ||
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); | |
410 | ||
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); | |
419 | ||
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); | |
428 | ||
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); | |
437 | ||
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); | |
446 | ||
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); | |
455 | ||
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); | |
464 | ||
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); | |
473 | ||
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); | |
482 | ||
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); | |
491 | ||
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); | |
500 | ||
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); | |
509 | ||
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); | |
518 | ||
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); | |
527 | ||
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); | |
536 | ||
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); | |
545 | ||
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); | |
554 | ||
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); | |
563 | ||
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); | |
572 | ||
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); | |
581 | ||
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); | |
590 | ||
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); | |
599 | ||
600 | /* | |
601 | * If we're in kernel mode, dump the stack too.. | |
602 | */ | |
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(); | |
607 | ||
608 | tsk->thread.kregs = regs; | |
609 | ||
610 | show_stack(tsk, (unsigned long *)sp); | |
611 | } | |
612 | } | |
613 | ||
614 | struct task_struct * alloc_task_struct(void) | |
615 | { | |
616 | /* Get task descriptor pages */ | |
617 | return (struct task_struct *) | |
618 | __get_free_pages(GFP_KERNEL, get_order(THREAD_SIZE)); | |
619 | } | |
620 | ||
621 | void free_task_struct(struct task_struct *p) | |
622 | { | |
623 | free_pages((unsigned long) p, get_order(THREAD_SIZE)); | |
624 | } | |
625 | ||
626 | /* | |
627 | * Create a kernel thread | |
628 | */ | |
629 | ||
630 | /* | |
631 | * This is the mechanism for creating a new kernel thread. | |
632 | * | |
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. | |
637 | */ | |
638 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
639 | { | |
640 | /* A bit less processor dependent than older sh ... */ | |
641 | unsigned int reply; | |
642 | ||
643 | static __inline__ _syscall2(int,clone,unsigned long,flags,unsigned long,newsp) | |
644 | static __inline__ _syscall1(int,exit,int,ret) | |
645 | ||
646 | reply = clone(flags | CLONE_VM, 0); | |
647 | if (!reply) { | |
648 | /* Child */ | |
649 | reply = exit(fn(arg)); | |
650 | } | |
651 | ||
652 | return reply; | |
653 | } | |
654 | ||
655 | /* | |
656 | * Free current thread data structures etc.. | |
657 | */ | |
658 | void exit_thread(void) | |
659 | { | |
660 | /* See arch/sparc/kernel/process.c for the precedent for doing this -- RPC. | |
661 | ||
662 | The SH-5 FPU save/restore approach relies on last_task_used_math | |
663 | pointing to a live task_struct. When another task tries to use the | |
664 | FPU for the 1st time, the FPUDIS trap handling (see | |
665 | arch/sh64/kernel/fpu.c) will save the existing FPU state to the | |
666 | FP regs field within last_task_used_math before re-loading the new | |
667 | task's FPU state (or initialising it if the FPU has been used | |
668 | before). So if last_task_used_math is stale, and its page has already been | |
669 | re-allocated for another use, the consequences are rather grim. Unless we | |
670 | null it here, there is no other path through which it would get safely | |
671 | nulled. */ | |
672 | ||
673 | #ifdef CONFIG_SH_FPU | |
674 | if (last_task_used_math == current) { | |
675 | last_task_used_math = NULL; | |
676 | } | |
677 | #endif | |
678 | } | |
679 | ||
680 | void flush_thread(void) | |
681 | { | |
682 | ||
683 | /* Called by fs/exec.c (flush_old_exec) to remove traces of a | |
684 | * previously running executable. */ | |
685 | #ifdef CONFIG_SH_FPU | |
686 | if (last_task_used_math == current) { | |
687 | last_task_used_math = NULL; | |
688 | } | |
689 | /* Force FPU state to be reinitialised after exec */ | |
690 | clear_used_math(); | |
691 | #endif | |
692 | ||
693 | /* if we are a kernel thread, about to change to user thread, | |
694 | * update kreg | |
695 | */ | |
696 | if(current->thread.kregs==&fake_swapper_regs) { | |
697 | current->thread.kregs = | |
698 | ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1); | |
699 | current->thread.uregs = current->thread.kregs; | |
700 | } | |
701 | } | |
702 | ||
703 | void release_thread(struct task_struct *dead_task) | |
704 | { | |
705 | /* do nothing */ | |
706 | } | |
707 | ||
708 | /* Fill in the fpu structure for a core dump.. */ | |
709 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
710 | { | |
711 | #ifdef CONFIG_SH_FPU | |
712 | int fpvalid; | |
713 | struct task_struct *tsk = current; | |
714 | ||
715 | fpvalid = !!tsk_used_math(tsk); | |
716 | if (fpvalid) { | |
717 | if (current == last_task_used_math) { | |
718 | grab_fpu(); | |
719 | fpsave(&tsk->thread.fpu.hard); | |
720 | release_fpu(); | |
721 | last_task_used_math = 0; | |
722 | regs->sr |= SR_FD; | |
723 | } | |
724 | ||
725 | memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu)); | |
726 | } | |
727 | ||
728 | return fpvalid; | |
729 | #else | |
730 | return 0; /* Task didn't use the fpu at all. */ | |
731 | #endif | |
732 | } | |
733 | ||
734 | asmlinkage void ret_from_fork(void); | |
735 | ||
736 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, | |
737 | unsigned long unused, | |
738 | struct task_struct *p, struct pt_regs *regs) | |
739 | { | |
740 | struct pt_regs *childregs; | |
741 | unsigned long long se; /* Sign extension */ | |
742 | ||
743 | #ifdef CONFIG_SH_FPU | |
744 | if(last_task_used_math == current) { | |
745 | grab_fpu(); | |
746 | fpsave(¤t->thread.fpu.hard); | |
747 | release_fpu(); | |
748 | last_task_used_math = NULL; | |
749 | regs->sr |= SR_FD; | |
750 | } | |
751 | #endif | |
752 | /* Copy from sh version */ | |
753 | childregs = ((struct pt_regs *)(THREAD_SIZE + (unsigned long) p->thread_info )) - 1; | |
754 | ||
755 | *childregs = *regs; | |
756 | ||
757 | if (user_mode(regs)) { | |
758 | childregs->regs[15] = usp; | |
759 | p->thread.uregs = childregs; | |
760 | } else { | |
761 | childregs->regs[15] = (unsigned long)p->thread_info + THREAD_SIZE; | |
762 | } | |
763 | ||
764 | childregs->regs[9] = 0; /* Set return value for child */ | |
765 | childregs->sr |= SR_FD; /* Invalidate FPU flag */ | |
766 | ||
767 | p->thread.sp = (unsigned long) childregs; | |
768 | p->thread.pc = (unsigned long) ret_from_fork; | |
769 | ||
770 | /* | |
771 | * Sign extend the edited stack. | |
772 | * Note that thread.pc and thread.pc will stay | |
773 | * 32-bit wide and context switch must take care | |
774 | * of NEFF sign extension. | |
775 | */ | |
776 | ||
777 | se = childregs->regs[15]; | |
778 | se = (se & NEFF_SIGN) ? (se | NEFF_MASK) : se; | |
779 | childregs->regs[15] = se; | |
780 | ||
781 | return 0; | |
782 | } | |
783 | ||
784 | /* | |
785 | * fill in the user structure for a core dump.. | |
786 | */ | |
787 | void dump_thread(struct pt_regs * regs, struct user * dump) | |
788 | { | |
789 | dump->magic = CMAGIC; | |
790 | dump->start_code = current->mm->start_code; | |
791 | dump->start_data = current->mm->start_data; | |
792 | dump->start_stack = regs->regs[15] & ~(PAGE_SIZE - 1); | |
793 | dump->u_tsize = (current->mm->end_code - dump->start_code) >> PAGE_SHIFT; | |
794 | dump->u_dsize = (current->mm->brk + (PAGE_SIZE-1) - dump->start_data) >> PAGE_SHIFT; | |
795 | dump->u_ssize = (current->mm->start_stack - dump->start_stack + | |
796 | PAGE_SIZE - 1) >> PAGE_SHIFT; | |
797 | /* Debug registers will come here. */ | |
798 | ||
799 | dump->regs = *regs; | |
800 | ||
801 | dump->u_fpvalid = dump_fpu(regs, &dump->fpu); | |
802 | } | |
803 | ||
804 | asmlinkage int sys_fork(unsigned long r2, unsigned long r3, | |
805 | unsigned long r4, unsigned long r5, | |
806 | unsigned long r6, unsigned long r7, | |
807 | struct pt_regs *pregs) | |
808 | { | |
809 | return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); | |
810 | } | |
811 | ||
812 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
813 | unsigned long r4, unsigned long r5, | |
814 | unsigned long r6, unsigned long r7, | |
815 | struct pt_regs *pregs) | |
816 | { | |
817 | if (!newsp) | |
818 | newsp = pregs->regs[15]; | |
819 | return do_fork(clone_flags, newsp, pregs, 0, 0, 0); | |
820 | } | |
821 | ||
822 | /* | |
823 | * This is trivial, and on the face of it looks like it | |
824 | * could equally well be done in user mode. | |
825 | * | |
826 | * Not so, for quite unobvious reasons - register pressure. | |
827 | * In user mode vfork() cannot have a stack frame, and if | |
828 | * done by calling the "clone()" system call directly, you | |
829 | * do not have enough call-clobbered registers to hold all | |
830 | * the information you need. | |
831 | */ | |
832 | asmlinkage int sys_vfork(unsigned long r2, unsigned long r3, | |
833 | unsigned long r4, unsigned long r5, | |
834 | unsigned long r6, unsigned long r7, | |
835 | struct pt_regs *pregs) | |
836 | { | |
837 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); | |
838 | } | |
839 | ||
840 | /* | |
841 | * sys_execve() executes a new program. | |
842 | */ | |
843 | asmlinkage int sys_execve(char *ufilename, char **uargv, | |
844 | char **uenvp, unsigned long r5, | |
845 | unsigned long r6, unsigned long r7, | |
846 | struct pt_regs *pregs) | |
847 | { | |
848 | int error; | |
849 | char *filename; | |
850 | ||
851 | lock_kernel(); | |
852 | filename = getname((char __user *)ufilename); | |
853 | error = PTR_ERR(filename); | |
854 | if (IS_ERR(filename)) | |
855 | goto out; | |
856 | ||
857 | error = do_execve(filename, | |
858 | (char __user * __user *)uargv, | |
859 | (char __user * __user *)uenvp, | |
860 | pregs); | |
861 | if (error == 0) { | |
862 | task_lock(current); | |
863 | current->ptrace &= ~PT_DTRACE; | |
864 | task_unlock(current); | |
865 | } | |
866 | putname(filename); | |
867 | out: | |
868 | unlock_kernel(); | |
869 | return error; | |
870 | } | |
871 | ||
872 | /* | |
873 | * These bracket the sleeping functions.. | |
874 | */ | |
875 | extern void interruptible_sleep_on(wait_queue_head_t *q); | |
876 | ||
877 | #define mid_sched ((unsigned long) interruptible_sleep_on) | |
878 | ||
879 | static int in_sh64_switch_to(unsigned long pc) | |
880 | { | |
881 | extern char __sh64_switch_to_end; | |
882 | /* For a sleeping task, the PC is somewhere in the middle of the function, | |
883 | so we don't have to worry about masking the LSB off */ | |
884 | return (pc >= (unsigned long) sh64_switch_to) && | |
885 | (pc < (unsigned long) &__sh64_switch_to_end); | |
886 | } | |
887 | ||
888 | unsigned long get_wchan(struct task_struct *p) | |
889 | { | |
890 | unsigned long schedule_fp; | |
891 | unsigned long sh64_switch_to_fp; | |
892 | unsigned long schedule_caller_pc; | |
893 | unsigned long pc; | |
894 | ||
895 | if (!p || p == current || p->state == TASK_RUNNING) | |
896 | return 0; | |
897 | ||
898 | /* | |
899 | * The same comment as on the Alpha applies here, too ... | |
900 | */ | |
901 | pc = thread_saved_pc(p); | |
902 | ||
903 | #ifdef CONFIG_FRAME_POINTER | |
904 | if (in_sh64_switch_to(pc)) { | |
905 | sh64_switch_to_fp = (long) p->thread.sp; | |
906 | /* r14 is saved at offset 4 in the sh64_switch_to frame */ | |
907 | schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4); | |
908 | ||
909 | /* and the caller of 'schedule' is (currently!) saved at offset 24 | |
910 | in the frame of schedule (from disasm) */ | |
911 | schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24); | |
912 | return schedule_caller_pc; | |
913 | } | |
914 | #endif | |
915 | return pc; | |
916 | } | |
917 | ||
918 | /* Provide a /proc/asids file that lists out the | |
919 | ASIDs currently associated with the processes. (If the DM.PC register is | |
920 | examined through the debug link, this shows ASID + PC. To make use of this, | |
921 | the PID->ASID relationship needs to be known. This is primarily for | |
922 | debugging.) | |
923 | */ | |
924 | ||
925 | #if defined(CONFIG_SH64_PROC_ASIDS) | |
926 | #include <linux/init.h> | |
927 | #include <linux/proc_fs.h> | |
928 | ||
929 | static int | |
930 | asids_proc_info(char *buf, char **start, off_t fpos, int length, int *eof, void *data) | |
931 | { | |
932 | int len=0; | |
933 | struct task_struct *p; | |
934 | read_lock(&tasklist_lock); | |
935 | for_each_process(p) { | |
936 | int pid = p->pid; | |
937 | struct mm_struct *mm; | |
938 | if (!pid) continue; | |
939 | mm = p->mm; | |
940 | if (mm) { | |
941 | unsigned long asid, context; | |
942 | context = mm->context; | |
943 | asid = (context & 0xff); | |
944 | len += sprintf(buf+len, "%5d : %02lx\n", pid, asid); | |
945 | } else { | |
946 | len += sprintf(buf+len, "%5d : (none)\n", pid); | |
947 | } | |
948 | } | |
949 | read_unlock(&tasklist_lock); | |
950 | *eof = 1; | |
951 | return len; | |
952 | } | |
953 | ||
954 | static int __init register_proc_asids(void) | |
955 | { | |
956 | create_proc_read_entry("asids", 0, NULL, asids_proc_info, NULL); | |
957 | return 0; | |
958 | } | |
959 | ||
960 | __initcall(register_proc_asids); | |
961 | #endif | |
962 |