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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 | ||
1da177e4 LT |
38 | #include <linux/kernel.h> |
39 | #include <linux/rwsem.h> | |
40 | #include <linux/mm.h> | |
41 | #include <linux/smp.h> | |
42 | #include <linux/smp_lock.h> | |
43 | #include <linux/ptrace.h> | |
44 | #include <linux/slab.h> | |
45 | #include <linux/vmalloc.h> | |
46 | #include <linux/user.h> | |
47 | #include <linux/a.out.h> | |
48 | #include <linux/interrupt.h> | |
49 | #include <linux/unistd.h> | |
50 | #include <linux/delay.h> | |
51 | #include <linux/reboot.h> | |
52 | #include <linux/init.h> | |
53 | ||
54 | #include <asm/uaccess.h> | |
55 | #include <asm/pgtable.h> | |
56 | #include <asm/system.h> | |
57 | #include <asm/io.h> | |
58 | #include <asm/processor.h> /* includes also <asm/registers.h> */ | |
59 | #include <asm/mmu_context.h> | |
60 | #include <asm/elf.h> | |
61 | #include <asm/page.h> | |
62 | ||
63 | #include <linux/irq.h> | |
64 | ||
65 | struct task_struct *last_task_used_math = NULL; | |
66 | ||
67 | #ifdef IDLE_TRACE | |
68 | #ifdef VM_SHOW_TABLES | |
69 | /* For testing */ | |
70 | static void print_PTE(long base) | |
71 | { | |
72 | int i, skip=0; | |
73 | long long x, y, *p = (long long *) base; | |
74 | ||
75 | for (i=0; i< 512; i++, p++){ | |
76 | if (*p == 0) { | |
77 | if (!skip) { | |
78 | skip++; | |
79 | printk("(0s) "); | |
80 | } | |
81 | } else { | |
82 | skip=0; | |
83 | x = (*p) >> 32; | |
84 | y = (*p) & 0xffffffff; | |
85 | printk("%08Lx%08Lx ", x, y); | |
86 | if (!((i+1)&0x3)) printk("\n"); | |
87 | } | |
88 | } | |
89 | } | |
90 | ||
91 | /* For testing */ | |
92 | static void print_DIR(long base) | |
93 | { | |
94 | int i, skip=0; | |
95 | long *p = (long *) base; | |
96 | ||
97 | for (i=0; i< 512; i++, p++){ | |
98 | if (*p == 0) { | |
99 | if (!skip) { | |
100 | skip++; | |
101 | printk("(0s) "); | |
102 | } | |
103 | } else { | |
104 | skip=0; | |
105 | printk("%08lx ", *p); | |
106 | if (!((i+1)&0x7)) printk("\n"); | |
107 | } | |
108 | } | |
109 | } | |
110 | ||
111 | /* For testing */ | |
112 | static void print_vmalloc_first_tables(void) | |
113 | { | |
114 | ||
115 | #define PRESENT 0x800 /* Bit 11 */ | |
116 | ||
117 | /* | |
118 | * Do it really dirty by looking at raw addresses, | |
119 | * raw offsets, no types. If we used pgtable/pgalloc | |
120 | * macros/definitions we could hide potential bugs. | |
121 | * | |
122 | * Note that pointers are 32-bit for CDC. | |
123 | */ | |
124 | long pgdt, pmdt, ptet; | |
125 | ||
126 | pgdt = (long) &swapper_pg_dir; | |
127 | printk("-->PGD (0x%08lx):\n", pgdt); | |
128 | print_DIR(pgdt); | |
129 | printk("\n"); | |
130 | ||
131 | /* VMALLOC pool is mapped at 0xc0000000, second (pointer) entry in PGD */ | |
132 | pgdt += 4; | |
133 | pmdt = (long) (* (long *) pgdt); | |
134 | if (!(pmdt & PRESENT)) { | |
135 | printk("No PMD\n"); | |
136 | return; | |
137 | } else pmdt &= 0xfffff000; | |
138 | ||
139 | printk("-->PMD (0x%08lx):\n", pmdt); | |
140 | print_DIR(pmdt); | |
141 | printk("\n"); | |
142 | ||
143 | /* Get the pmdt displacement for 0xc0000000 */ | |
144 | pmdt += 2048; | |
145 | ||
146 | /* just look at first two address ranges ... */ | |
147 | /* ... 0xc0000000 ... */ | |
148 | ptet = (long) (* (long *) pmdt); | |
149 | if (!(ptet & PRESENT)) { | |
150 | printk("No PTE0\n"); | |
151 | return; | |
152 | } else ptet &= 0xfffff000; | |
153 | ||
154 | printk("-->PTE0 (0x%08lx):\n", ptet); | |
155 | print_PTE(ptet); | |
156 | printk("\n"); | |
157 | ||
158 | /* ... 0xc0001000 ... */ | |
159 | ptet += 4; | |
160 | if (!(ptet & PRESENT)) { | |
161 | printk("No PTE1\n"); | |
162 | return; | |
163 | } else ptet &= 0xfffff000; | |
164 | printk("-->PTE1 (0x%08lx):\n", ptet); | |
165 | print_PTE(ptet); | |
166 | printk("\n"); | |
167 | } | |
168 | #else | |
169 | #define print_vmalloc_first_tables() | |
170 | #endif /* VM_SHOW_TABLES */ | |
171 | ||
172 | static void test_VM(void) | |
173 | { | |
174 | void *a, *b, *c; | |
175 | ||
176 | #ifdef VM_SHOW_TABLES | |
177 | printk("Initial PGD/PMD/PTE\n"); | |
178 | #endif | |
179 | print_vmalloc_first_tables(); | |
180 | ||
181 | printk("Allocating 2 bytes\n"); | |
182 | a = vmalloc(2); | |
183 | print_vmalloc_first_tables(); | |
184 | ||
185 | printk("Allocating 4100 bytes\n"); | |
186 | b = vmalloc(4100); | |
187 | print_vmalloc_first_tables(); | |
188 | ||
189 | printk("Allocating 20234 bytes\n"); | |
190 | c = vmalloc(20234); | |
191 | print_vmalloc_first_tables(); | |
192 | ||
193 | #ifdef VM_TEST_FAULT | |
194 | /* Here you may want to fault ! */ | |
195 | ||
196 | #ifdef VM_TEST_RTLBMISS | |
197 | printk("Ready to fault upon read.\n"); | |
198 | if (* (char *) a) { | |
199 | printk("RTLBMISSed on area a !\n"); | |
200 | } | |
201 | printk("RTLBMISSed on area a !\n"); | |
202 | #endif | |
203 | ||
204 | #ifdef VM_TEST_WTLBMISS | |
205 | printk("Ready to fault upon write.\n"); | |
206 | *((char *) b) = 'L'; | |
207 | printk("WTLBMISSed on area b !\n"); | |
208 | #endif | |
209 | ||
210 | #endif /* VM_TEST_FAULT */ | |
211 | ||
212 | printk("Deallocating the 4100 byte chunk\n"); | |
213 | vfree(b); | |
214 | print_vmalloc_first_tables(); | |
215 | ||
216 | printk("Deallocating the 2 byte chunk\n"); | |
217 | vfree(a); | |
218 | print_vmalloc_first_tables(); | |
219 | ||
220 | printk("Deallocating the last chunk\n"); | |
221 | vfree(c); | |
222 | print_vmalloc_first_tables(); | |
223 | } | |
224 | ||
225 | extern unsigned long volatile jiffies; | |
226 | int once = 0; | |
227 | unsigned long old_jiffies; | |
228 | int pid = -1, pgid = -1; | |
229 | ||
230 | void idle_trace(void) | |
231 | { | |
232 | ||
233 | _syscall0(int, getpid) | |
234 | _syscall1(int, getpgid, int, pid) | |
235 | ||
236 | if (!once) { | |
237 | /* VM allocation/deallocation simple test */ | |
238 | test_VM(); | |
239 | pid = getpid(); | |
240 | ||
241 | printk("Got all through to Idle !!\n"); | |
242 | printk("I'm now going to loop forever ...\n"); | |
243 | printk("Any ! below is a timer tick.\n"); | |
244 | printk("Any . below is a getpgid system call from pid = %d.\n", pid); | |
245 | ||
246 | ||
247 | old_jiffies = jiffies; | |
248 | once++; | |
249 | } | |
250 | ||
251 | if (old_jiffies != jiffies) { | |
252 | old_jiffies = jiffies - old_jiffies; | |
253 | switch (old_jiffies) { | |
254 | case 1: | |
255 | printk("!"); | |
256 | break; | |
257 | case 2: | |
258 | printk("!!"); | |
259 | break; | |
260 | case 3: | |
261 | printk("!!!"); | |
262 | break; | |
263 | case 4: | |
264 | printk("!!!!"); | |
265 | break; | |
266 | default: | |
267 | printk("(%d!)", (int) old_jiffies); | |
268 | } | |
269 | old_jiffies = jiffies; | |
270 | } | |
271 | pgid = getpgid(pid); | |
272 | printk("."); | |
273 | } | |
274 | #else | |
275 | #define idle_trace() do { } while (0) | |
276 | #endif /* IDLE_TRACE */ | |
277 | ||
278 | static int hlt_counter = 1; | |
279 | ||
280 | #define HARD_IDLE_TIMEOUT (HZ / 3) | |
281 | ||
282 | void disable_hlt(void) | |
283 | { | |
284 | hlt_counter++; | |
285 | } | |
286 | ||
287 | void enable_hlt(void) | |
288 | { | |
289 | hlt_counter--; | |
290 | } | |
291 | ||
292 | static int __init nohlt_setup(char *__unused) | |
293 | { | |
294 | hlt_counter = 1; | |
295 | return 1; | |
296 | } | |
297 | ||
298 | static int __init hlt_setup(char *__unused) | |
299 | { | |
300 | hlt_counter = 0; | |
301 | return 1; | |
302 | } | |
303 | ||
304 | __setup("nohlt", nohlt_setup); | |
305 | __setup("hlt", hlt_setup); | |
306 | ||
307 | static inline void hlt(void) | |
308 | { | |
1da177e4 LT |
309 | __asm__ __volatile__ ("sleep" : : : "memory"); |
310 | } | |
311 | ||
312 | /* | |
313 | * The idle loop on a uniprocessor SH.. | |
314 | */ | |
64c7c8f8 | 315 | void cpu_idle(void) |
1da177e4 LT |
316 | { |
317 | /* endless idle loop with no priority at all */ | |
318 | while (1) { | |
319 | if (hlt_counter) { | |
64c7c8f8 NP |
320 | while (!need_resched()) |
321 | cpu_relax(); | |
1da177e4 LT |
322 | } else { |
323 | local_irq_disable(); | |
324 | while (!need_resched()) { | |
325 | local_irq_enable(); | |
326 | idle_trace(); | |
327 | hlt(); | |
328 | local_irq_disable(); | |
329 | } | |
330 | local_irq_enable(); | |
331 | } | |
5bfb5d69 | 332 | preempt_enable_no_resched(); |
1da177e4 | 333 | schedule(); |
5bfb5d69 | 334 | preempt_disable(); |
1da177e4 | 335 | } |
1da177e4 | 336 | |
1da177e4 LT |
337 | } |
338 | ||
339 | void machine_restart(char * __unused) | |
340 | { | |
341 | extern void phys_stext(void); | |
342 | ||
343 | phys_stext(); | |
344 | } | |
345 | ||
346 | void machine_halt(void) | |
347 | { | |
348 | for (;;); | |
349 | } | |
350 | ||
351 | void machine_power_off(void) | |
352 | { | |
353 | extern void enter_deep_standby(void); | |
354 | ||
355 | enter_deep_standby(); | |
356 | } | |
357 | ||
358 | void show_regs(struct pt_regs * regs) | |
359 | { | |
360 | unsigned long long ah, al, bh, bl, ch, cl; | |
361 | ||
362 | printk("\n"); | |
363 | ||
364 | ah = (regs->pc) >> 32; | |
365 | al = (regs->pc) & 0xffffffff; | |
366 | bh = (regs->regs[18]) >> 32; | |
367 | bl = (regs->regs[18]) & 0xffffffff; | |
368 | ch = (regs->regs[15]) >> 32; | |
369 | cl = (regs->regs[15]) & 0xffffffff; | |
370 | printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n", | |
371 | ah, al, bh, bl, ch, cl); | |
372 | ||
373 | ah = (regs->sr) >> 32; | |
374 | al = (regs->sr) & 0xffffffff; | |
375 | asm volatile ("getcon " __TEA ", %0" : "=r" (bh)); | |
376 | asm volatile ("getcon " __TEA ", %0" : "=r" (bl)); | |
377 | bh = (bh) >> 32; | |
378 | bl = (bl) & 0xffffffff; | |
379 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch)); | |
380 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl)); | |
381 | ch = (ch) >> 32; | |
382 | cl = (cl) & 0xffffffff; | |
383 | printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n", | |
384 | ah, al, bh, bl, ch, cl); | |
385 | ||
386 | ah = (regs->regs[0]) >> 32; | |
387 | al = (regs->regs[0]) & 0xffffffff; | |
388 | bh = (regs->regs[1]) >> 32; | |
389 | bl = (regs->regs[1]) & 0xffffffff; | |
390 | ch = (regs->regs[2]) >> 32; | |
391 | cl = (regs->regs[2]) & 0xffffffff; | |
392 | printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n", | |
393 | ah, al, bh, bl, ch, cl); | |
394 | ||
395 | ah = (regs->regs[3]) >> 32; | |
396 | al = (regs->regs[3]) & 0xffffffff; | |
397 | bh = (regs->regs[4]) >> 32; | |
398 | bl = (regs->regs[4]) & 0xffffffff; | |
399 | ch = (regs->regs[5]) >> 32; | |
400 | cl = (regs->regs[5]) & 0xffffffff; | |
401 | printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n", | |
402 | ah, al, bh, bl, ch, cl); | |
403 | ||
404 | ah = (regs->regs[6]) >> 32; | |
405 | al = (regs->regs[6]) & 0xffffffff; | |
406 | bh = (regs->regs[7]) >> 32; | |
407 | bl = (regs->regs[7]) & 0xffffffff; | |
408 | ch = (regs->regs[8]) >> 32; | |
409 | cl = (regs->regs[8]) & 0xffffffff; | |
410 | printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n", | |
411 | ah, al, bh, bl, ch, cl); | |
412 | ||
413 | ah = (regs->regs[9]) >> 32; | |
414 | al = (regs->regs[9]) & 0xffffffff; | |
415 | bh = (regs->regs[10]) >> 32; | |
416 | bl = (regs->regs[10]) & 0xffffffff; | |
417 | ch = (regs->regs[11]) >> 32; | |
418 | cl = (regs->regs[11]) & 0xffffffff; | |
419 | printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n", | |
420 | ah, al, bh, bl, ch, cl); | |
421 | ||
422 | ah = (regs->regs[12]) >> 32; | |
423 | al = (regs->regs[12]) & 0xffffffff; | |
424 | bh = (regs->regs[13]) >> 32; | |
425 | bl = (regs->regs[13]) & 0xffffffff; | |
426 | ch = (regs->regs[14]) >> 32; | |
427 | cl = (regs->regs[14]) & 0xffffffff; | |
428 | printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n", | |
429 | ah, al, bh, bl, ch, cl); | |
430 | ||
431 | ah = (regs->regs[16]) >> 32; | |
432 | al = (regs->regs[16]) & 0xffffffff; | |
433 | bh = (regs->regs[17]) >> 32; | |
434 | bl = (regs->regs[17]) & 0xffffffff; | |
435 | ch = (regs->regs[19]) >> 32; | |
436 | cl = (regs->regs[19]) & 0xffffffff; | |
437 | printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n", | |
438 | ah, al, bh, bl, ch, cl); | |
439 | ||
440 | ah = (regs->regs[20]) >> 32; | |
441 | al = (regs->regs[20]) & 0xffffffff; | |
442 | bh = (regs->regs[21]) >> 32; | |
443 | bl = (regs->regs[21]) & 0xffffffff; | |
444 | ch = (regs->regs[22]) >> 32; | |
445 | cl = (regs->regs[22]) & 0xffffffff; | |
446 | printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n", | |
447 | ah, al, bh, bl, ch, cl); | |
448 | ||
449 | ah = (regs->regs[23]) >> 32; | |
450 | al = (regs->regs[23]) & 0xffffffff; | |
451 | bh = (regs->regs[24]) >> 32; | |
452 | bl = (regs->regs[24]) & 0xffffffff; | |
453 | ch = (regs->regs[25]) >> 32; | |
454 | cl = (regs->regs[25]) & 0xffffffff; | |
455 | printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n", | |
456 | ah, al, bh, bl, ch, cl); | |
457 | ||
458 | ah = (regs->regs[26]) >> 32; | |
459 | al = (regs->regs[26]) & 0xffffffff; | |
460 | bh = (regs->regs[27]) >> 32; | |
461 | bl = (regs->regs[27]) & 0xffffffff; | |
462 | ch = (regs->regs[28]) >> 32; | |
463 | cl = (regs->regs[28]) & 0xffffffff; | |
464 | printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n", | |
465 | ah, al, bh, bl, ch, cl); | |
466 | ||
467 | ah = (regs->regs[29]) >> 32; | |
468 | al = (regs->regs[29]) & 0xffffffff; | |
469 | bh = (regs->regs[30]) >> 32; | |
470 | bl = (regs->regs[30]) & 0xffffffff; | |
471 | ch = (regs->regs[31]) >> 32; | |
472 | cl = (regs->regs[31]) & 0xffffffff; | |
473 | printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n", | |
474 | ah, al, bh, bl, ch, cl); | |
475 | ||
476 | ah = (regs->regs[32]) >> 32; | |
477 | al = (regs->regs[32]) & 0xffffffff; | |
478 | bh = (regs->regs[33]) >> 32; | |
479 | bl = (regs->regs[33]) & 0xffffffff; | |
480 | ch = (regs->regs[34]) >> 32; | |
481 | cl = (regs->regs[34]) & 0xffffffff; | |
482 | printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n", | |
483 | ah, al, bh, bl, ch, cl); | |
484 | ||
485 | ah = (regs->regs[35]) >> 32; | |
486 | al = (regs->regs[35]) & 0xffffffff; | |
487 | bh = (regs->regs[36]) >> 32; | |
488 | bl = (regs->regs[36]) & 0xffffffff; | |
489 | ch = (regs->regs[37]) >> 32; | |
490 | cl = (regs->regs[37]) & 0xffffffff; | |
491 | printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n", | |
492 | ah, al, bh, bl, ch, cl); | |
493 | ||
494 | ah = (regs->regs[38]) >> 32; | |
495 | al = (regs->regs[38]) & 0xffffffff; | |
496 | bh = (regs->regs[39]) >> 32; | |
497 | bl = (regs->regs[39]) & 0xffffffff; | |
498 | ch = (regs->regs[40]) >> 32; | |
499 | cl = (regs->regs[40]) & 0xffffffff; | |
500 | printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n", | |
501 | ah, al, bh, bl, ch, cl); | |
502 | ||
503 | ah = (regs->regs[41]) >> 32; | |
504 | al = (regs->regs[41]) & 0xffffffff; | |
505 | bh = (regs->regs[42]) >> 32; | |
506 | bl = (regs->regs[42]) & 0xffffffff; | |
507 | ch = (regs->regs[43]) >> 32; | |
508 | cl = (regs->regs[43]) & 0xffffffff; | |
509 | printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n", | |
510 | ah, al, bh, bl, ch, cl); | |
511 | ||
512 | ah = (regs->regs[44]) >> 32; | |
513 | al = (regs->regs[44]) & 0xffffffff; | |
514 | bh = (regs->regs[45]) >> 32; | |
515 | bl = (regs->regs[45]) & 0xffffffff; | |
516 | ch = (regs->regs[46]) >> 32; | |
517 | cl = (regs->regs[46]) & 0xffffffff; | |
518 | printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n", | |
519 | ah, al, bh, bl, ch, cl); | |
520 | ||
521 | ah = (regs->regs[47]) >> 32; | |
522 | al = (regs->regs[47]) & 0xffffffff; | |
523 | bh = (regs->regs[48]) >> 32; | |
524 | bl = (regs->regs[48]) & 0xffffffff; | |
525 | ch = (regs->regs[49]) >> 32; | |
526 | cl = (regs->regs[49]) & 0xffffffff; | |
527 | printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n", | |
528 | ah, al, bh, bl, ch, cl); | |
529 | ||
530 | ah = (regs->regs[50]) >> 32; | |
531 | al = (regs->regs[50]) & 0xffffffff; | |
532 | bh = (regs->regs[51]) >> 32; | |
533 | bl = (regs->regs[51]) & 0xffffffff; | |
534 | ch = (regs->regs[52]) >> 32; | |
535 | cl = (regs->regs[52]) & 0xffffffff; | |
536 | printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n", | |
537 | ah, al, bh, bl, ch, cl); | |
538 | ||
539 | ah = (regs->regs[53]) >> 32; | |
540 | al = (regs->regs[53]) & 0xffffffff; | |
541 | bh = (regs->regs[54]) >> 32; | |
542 | bl = (regs->regs[54]) & 0xffffffff; | |
543 | ch = (regs->regs[55]) >> 32; | |
544 | cl = (regs->regs[55]) & 0xffffffff; | |
545 | printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n", | |
546 | ah, al, bh, bl, ch, cl); | |
547 | ||
548 | ah = (regs->regs[56]) >> 32; | |
549 | al = (regs->regs[56]) & 0xffffffff; | |
550 | bh = (regs->regs[57]) >> 32; | |
551 | bl = (regs->regs[57]) & 0xffffffff; | |
552 | ch = (regs->regs[58]) >> 32; | |
553 | cl = (regs->regs[58]) & 0xffffffff; | |
554 | printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n", | |
555 | ah, al, bh, bl, ch, cl); | |
556 | ||
557 | ah = (regs->regs[59]) >> 32; | |
558 | al = (regs->regs[59]) & 0xffffffff; | |
559 | bh = (regs->regs[60]) >> 32; | |
560 | bl = (regs->regs[60]) & 0xffffffff; | |
561 | ch = (regs->regs[61]) >> 32; | |
562 | cl = (regs->regs[61]) & 0xffffffff; | |
563 | printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n", | |
564 | ah, al, bh, bl, ch, cl); | |
565 | ||
566 | ah = (regs->regs[62]) >> 32; | |
567 | al = (regs->regs[62]) & 0xffffffff; | |
568 | bh = (regs->tregs[0]) >> 32; | |
569 | bl = (regs->tregs[0]) & 0xffffffff; | |
570 | ch = (regs->tregs[1]) >> 32; | |
571 | cl = (regs->tregs[1]) & 0xffffffff; | |
572 | printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n", | |
573 | ah, al, bh, bl, ch, cl); | |
574 | ||
575 | ah = (regs->tregs[2]) >> 32; | |
576 | al = (regs->tregs[2]) & 0xffffffff; | |
577 | bh = (regs->tregs[3]) >> 32; | |
578 | bl = (regs->tregs[3]) & 0xffffffff; | |
579 | ch = (regs->tregs[4]) >> 32; | |
580 | cl = (regs->tregs[4]) & 0xffffffff; | |
581 | printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n", | |
582 | ah, al, bh, bl, ch, cl); | |
583 | ||
584 | ah = (regs->tregs[5]) >> 32; | |
585 | al = (regs->tregs[5]) & 0xffffffff; | |
586 | bh = (regs->tregs[6]) >> 32; | |
587 | bl = (regs->tregs[6]) & 0xffffffff; | |
588 | ch = (regs->tregs[7]) >> 32; | |
589 | cl = (regs->tregs[7]) & 0xffffffff; | |
590 | printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n", | |
591 | ah, al, bh, bl, ch, cl); | |
592 | ||
593 | /* | |
594 | * If we're in kernel mode, dump the stack too.. | |
595 | */ | |
596 | if (!user_mode(regs)) { | |
597 | void show_stack(struct task_struct *tsk, unsigned long *sp); | |
598 | unsigned long sp = regs->regs[15] & 0xffffffff; | |
599 | struct task_struct *tsk = get_current(); | |
600 | ||
601 | tsk->thread.kregs = regs; | |
602 | ||
603 | show_stack(tsk, (unsigned long *)sp); | |
604 | } | |
605 | } | |
606 | ||
607 | struct task_struct * alloc_task_struct(void) | |
608 | { | |
609 | /* Get task descriptor pages */ | |
610 | return (struct task_struct *) | |
611 | __get_free_pages(GFP_KERNEL, get_order(THREAD_SIZE)); | |
612 | } | |
613 | ||
614 | void free_task_struct(struct task_struct *p) | |
615 | { | |
616 | free_pages((unsigned long) p, get_order(THREAD_SIZE)); | |
617 | } | |
618 | ||
619 | /* | |
620 | * Create a kernel thread | |
621 | */ | |
622 | ||
623 | /* | |
624 | * This is the mechanism for creating a new kernel thread. | |
625 | * | |
626 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
627 | * who haven't done an "execve()") should use this: it will work within | |
628 | * a system call from a "real" process, but the process memory space will | |
629 | * not be free'd until both the parent and the child have exited. | |
630 | */ | |
631 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
632 | { | |
633 | /* A bit less processor dependent than older sh ... */ | |
634 | unsigned int reply; | |
635 | ||
636 | static __inline__ _syscall2(int,clone,unsigned long,flags,unsigned long,newsp) | |
637 | static __inline__ _syscall1(int,exit,int,ret) | |
638 | ||
639 | reply = clone(flags | CLONE_VM, 0); | |
640 | if (!reply) { | |
641 | /* Child */ | |
642 | reply = exit(fn(arg)); | |
643 | } | |
644 | ||
645 | return reply; | |
646 | } | |
647 | ||
648 | /* | |
649 | * Free current thread data structures etc.. | |
650 | */ | |
651 | void exit_thread(void) | |
652 | { | |
653 | /* See arch/sparc/kernel/process.c for the precedent for doing this -- RPC. | |
654 | ||
655 | The SH-5 FPU save/restore approach relies on last_task_used_math | |
656 | pointing to a live task_struct. When another task tries to use the | |
657 | FPU for the 1st time, the FPUDIS trap handling (see | |
658 | arch/sh64/kernel/fpu.c) will save the existing FPU state to the | |
659 | FP regs field within last_task_used_math before re-loading the new | |
660 | task's FPU state (or initialising it if the FPU has been used | |
661 | before). So if last_task_used_math is stale, and its page has already been | |
662 | re-allocated for another use, the consequences are rather grim. Unless we | |
663 | null it here, there is no other path through which it would get safely | |
664 | nulled. */ | |
665 | ||
666 | #ifdef CONFIG_SH_FPU | |
667 | if (last_task_used_math == current) { | |
668 | last_task_used_math = NULL; | |
669 | } | |
670 | #endif | |
671 | } | |
672 | ||
673 | void flush_thread(void) | |
674 | { | |
675 | ||
676 | /* Called by fs/exec.c (flush_old_exec) to remove traces of a | |
677 | * previously running executable. */ | |
678 | #ifdef CONFIG_SH_FPU | |
679 | if (last_task_used_math == current) { | |
680 | last_task_used_math = NULL; | |
681 | } | |
682 | /* Force FPU state to be reinitialised after exec */ | |
683 | clear_used_math(); | |
684 | #endif | |
685 | ||
686 | /* if we are a kernel thread, about to change to user thread, | |
687 | * update kreg | |
688 | */ | |
689 | if(current->thread.kregs==&fake_swapper_regs) { | |
690 | current->thread.kregs = | |
691 | ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1); | |
692 | current->thread.uregs = current->thread.kregs; | |
693 | } | |
694 | } | |
695 | ||
696 | void release_thread(struct task_struct *dead_task) | |
697 | { | |
698 | /* do nothing */ | |
699 | } | |
700 | ||
701 | /* Fill in the fpu structure for a core dump.. */ | |
702 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
703 | { | |
704 | #ifdef CONFIG_SH_FPU | |
705 | int fpvalid; | |
706 | struct task_struct *tsk = current; | |
707 | ||
708 | fpvalid = !!tsk_used_math(tsk); | |
709 | if (fpvalid) { | |
710 | if (current == last_task_used_math) { | |
711 | grab_fpu(); | |
712 | fpsave(&tsk->thread.fpu.hard); | |
713 | release_fpu(); | |
714 | last_task_used_math = 0; | |
715 | regs->sr |= SR_FD; | |
716 | } | |
717 | ||
718 | memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu)); | |
719 | } | |
720 | ||
721 | return fpvalid; | |
722 | #else | |
723 | return 0; /* Task didn't use the fpu at all. */ | |
724 | #endif | |
725 | } | |
726 | ||
727 | asmlinkage void ret_from_fork(void); | |
728 | ||
729 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, | |
730 | unsigned long unused, | |
731 | struct task_struct *p, struct pt_regs *regs) | |
732 | { | |
733 | struct pt_regs *childregs; | |
734 | unsigned long long se; /* Sign extension */ | |
735 | ||
736 | #ifdef CONFIG_SH_FPU | |
737 | if(last_task_used_math == current) { | |
738 | grab_fpu(); | |
739 | fpsave(¤t->thread.fpu.hard); | |
740 | release_fpu(); | |
741 | last_task_used_math = NULL; | |
742 | regs->sr |= SR_FD; | |
743 | } | |
744 | #endif | |
745 | /* Copy from sh version */ | |
ee8c1dd4 | 746 | childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1; |
1da177e4 LT |
747 | |
748 | *childregs = *regs; | |
749 | ||
750 | if (user_mode(regs)) { | |
751 | childregs->regs[15] = usp; | |
752 | p->thread.uregs = childregs; | |
753 | } else { | |
ee8c1dd4 | 754 | childregs->regs[15] = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
1da177e4 LT |
755 | } |
756 | ||
757 | childregs->regs[9] = 0; /* Set return value for child */ | |
758 | childregs->sr |= SR_FD; /* Invalidate FPU flag */ | |
759 | ||
760 | p->thread.sp = (unsigned long) childregs; | |
761 | p->thread.pc = (unsigned long) ret_from_fork; | |
762 | ||
763 | /* | |
764 | * Sign extend the edited stack. | |
765 | * Note that thread.pc and thread.pc will stay | |
766 | * 32-bit wide and context switch must take care | |
767 | * of NEFF sign extension. | |
768 | */ | |
769 | ||
770 | se = childregs->regs[15]; | |
771 | se = (se & NEFF_SIGN) ? (se | NEFF_MASK) : se; | |
772 | childregs->regs[15] = se; | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
1da177e4 LT |
777 | asmlinkage int sys_fork(unsigned long r2, unsigned long r3, |
778 | unsigned long r4, unsigned long r5, | |
779 | unsigned long r6, unsigned long r7, | |
780 | struct pt_regs *pregs) | |
781 | { | |
782 | return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); | |
783 | } | |
784 | ||
785 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
786 | unsigned long r4, unsigned long r5, | |
787 | unsigned long r6, unsigned long r7, | |
788 | struct pt_regs *pregs) | |
789 | { | |
790 | if (!newsp) | |
791 | newsp = pregs->regs[15]; | |
792 | return do_fork(clone_flags, newsp, pregs, 0, 0, 0); | |
793 | } | |
794 | ||
795 | /* | |
796 | * This is trivial, and on the face of it looks like it | |
797 | * could equally well be done in user mode. | |
798 | * | |
799 | * Not so, for quite unobvious reasons - register pressure. | |
800 | * In user mode vfork() cannot have a stack frame, and if | |
801 | * done by calling the "clone()" system call directly, you | |
802 | * do not have enough call-clobbered registers to hold all | |
803 | * the information you need. | |
804 | */ | |
805 | asmlinkage int sys_vfork(unsigned long r2, unsigned long r3, | |
806 | unsigned long r4, unsigned long r5, | |
807 | unsigned long r6, unsigned long r7, | |
808 | struct pt_regs *pregs) | |
809 | { | |
810 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); | |
811 | } | |
812 | ||
813 | /* | |
814 | * sys_execve() executes a new program. | |
815 | */ | |
816 | asmlinkage int sys_execve(char *ufilename, char **uargv, | |
817 | char **uenvp, unsigned long r5, | |
818 | unsigned long r6, unsigned long r7, | |
819 | struct pt_regs *pregs) | |
820 | { | |
821 | int error; | |
822 | char *filename; | |
823 | ||
824 | lock_kernel(); | |
825 | filename = getname((char __user *)ufilename); | |
826 | error = PTR_ERR(filename); | |
827 | if (IS_ERR(filename)) | |
828 | goto out; | |
829 | ||
830 | error = do_execve(filename, | |
831 | (char __user * __user *)uargv, | |
832 | (char __user * __user *)uenvp, | |
833 | pregs); | |
834 | if (error == 0) { | |
835 | task_lock(current); | |
836 | current->ptrace &= ~PT_DTRACE; | |
837 | task_unlock(current); | |
838 | } | |
839 | putname(filename); | |
840 | out: | |
841 | unlock_kernel(); | |
842 | return error; | |
843 | } | |
844 | ||
845 | /* | |
846 | * These bracket the sleeping functions.. | |
847 | */ | |
848 | extern void interruptible_sleep_on(wait_queue_head_t *q); | |
849 | ||
850 | #define mid_sched ((unsigned long) interruptible_sleep_on) | |
851 | ||
852 | static int in_sh64_switch_to(unsigned long pc) | |
853 | { | |
854 | extern char __sh64_switch_to_end; | |
855 | /* For a sleeping task, the PC is somewhere in the middle of the function, | |
856 | so we don't have to worry about masking the LSB off */ | |
857 | return (pc >= (unsigned long) sh64_switch_to) && | |
858 | (pc < (unsigned long) &__sh64_switch_to_end); | |
859 | } | |
860 | ||
861 | unsigned long get_wchan(struct task_struct *p) | |
862 | { | |
863 | unsigned long schedule_fp; | |
864 | unsigned long sh64_switch_to_fp; | |
865 | unsigned long schedule_caller_pc; | |
866 | unsigned long pc; | |
867 | ||
868 | if (!p || p == current || p->state == TASK_RUNNING) | |
869 | return 0; | |
870 | ||
871 | /* | |
872 | * The same comment as on the Alpha applies here, too ... | |
873 | */ | |
874 | pc = thread_saved_pc(p); | |
875 | ||
876 | #ifdef CONFIG_FRAME_POINTER | |
877 | if (in_sh64_switch_to(pc)) { | |
878 | sh64_switch_to_fp = (long) p->thread.sp; | |
879 | /* r14 is saved at offset 4 in the sh64_switch_to frame */ | |
880 | schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4); | |
881 | ||
882 | /* and the caller of 'schedule' is (currently!) saved at offset 24 | |
883 | in the frame of schedule (from disasm) */ | |
884 | schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24); | |
885 | return schedule_caller_pc; | |
886 | } | |
887 | #endif | |
888 | return pc; | |
889 | } | |
890 | ||
891 | /* Provide a /proc/asids file that lists out the | |
892 | ASIDs currently associated with the processes. (If the DM.PC register is | |
893 | examined through the debug link, this shows ASID + PC. To make use of this, | |
894 | the PID->ASID relationship needs to be known. This is primarily for | |
895 | debugging.) | |
896 | */ | |
897 | ||
898 | #if defined(CONFIG_SH64_PROC_ASIDS) | |
899 | #include <linux/init.h> | |
900 | #include <linux/proc_fs.h> | |
901 | ||
902 | static int | |
903 | asids_proc_info(char *buf, char **start, off_t fpos, int length, int *eof, void *data) | |
904 | { | |
905 | int len=0; | |
906 | struct task_struct *p; | |
907 | read_lock(&tasklist_lock); | |
908 | for_each_process(p) { | |
909 | int pid = p->pid; | |
910 | struct mm_struct *mm; | |
911 | if (!pid) continue; | |
912 | mm = p->mm; | |
913 | if (mm) { | |
914 | unsigned long asid, context; | |
915 | context = mm->context; | |
916 | asid = (context & 0xff); | |
917 | len += sprintf(buf+len, "%5d : %02lx\n", pid, asid); | |
918 | } else { | |
919 | len += sprintf(buf+len, "%5d : (none)\n", pid); | |
920 | } | |
921 | } | |
922 | read_unlock(&tasklist_lock); | |
923 | *eof = 1; | |
924 | return len; | |
925 | } | |
926 | ||
927 | static int __init register_proc_asids(void) | |
928 | { | |
929 | create_proc_read_entry("asids", 0, NULL, asids_proc_info, NULL); | |
930 | return 0; | |
931 | } | |
932 | ||
933 | __initcall(register_proc_asids); | |
934 | #endif | |
935 |