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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 | */ | |
1da177e4 | 23 | #include <linux/mm.h> |
78d98277 | 24 | #include <linux/fs.h> |
1da177e4 | 25 | #include <linux/ptrace.h> |
1da177e4 LT |
26 | #include <linux/reboot.h> |
27 | #include <linux/init.h> | |
821278a7 | 28 | #include <linux/module.h> |
c26056bc | 29 | #include <linux/proc_fs.h> |
1da177e4 LT |
30 | #include <asm/uaccess.h> |
31 | #include <asm/pgtable.h> | |
1da177e4 LT |
32 | |
33 | struct task_struct *last_task_used_math = NULL; | |
34 | ||
1da177e4 LT |
35 | static int hlt_counter = 1; |
36 | ||
37 | #define HARD_IDLE_TIMEOUT (HZ / 3) | |
38 | ||
39 | void disable_hlt(void) | |
40 | { | |
41 | hlt_counter++; | |
42 | } | |
43 | ||
44 | void enable_hlt(void) | |
45 | { | |
46 | hlt_counter--; | |
47 | } | |
48 | ||
49 | static int __init nohlt_setup(char *__unused) | |
50 | { | |
51 | hlt_counter = 1; | |
52 | return 1; | |
53 | } | |
54 | ||
55 | static int __init hlt_setup(char *__unused) | |
56 | { | |
57 | hlt_counter = 0; | |
58 | return 1; | |
59 | } | |
60 | ||
61 | __setup("nohlt", nohlt_setup); | |
62 | __setup("hlt", hlt_setup); | |
63 | ||
64 | static inline void hlt(void) | |
65 | { | |
1da177e4 LT |
66 | __asm__ __volatile__ ("sleep" : : : "memory"); |
67 | } | |
68 | ||
69 | /* | |
70 | * The idle loop on a uniprocessor SH.. | |
71 | */ | |
64c7c8f8 | 72 | void cpu_idle(void) |
1da177e4 LT |
73 | { |
74 | /* endless idle loop with no priority at all */ | |
75 | while (1) { | |
76 | if (hlt_counter) { | |
64c7c8f8 NP |
77 | while (!need_resched()) |
78 | cpu_relax(); | |
1da177e4 LT |
79 | } else { |
80 | local_irq_disable(); | |
81 | while (!need_resched()) { | |
82 | local_irq_enable(); | |
1da177e4 LT |
83 | hlt(); |
84 | local_irq_disable(); | |
85 | } | |
86 | local_irq_enable(); | |
87 | } | |
5bfb5d69 | 88 | preempt_enable_no_resched(); |
1da177e4 | 89 | schedule(); |
5bfb5d69 | 90 | preempt_disable(); |
1da177e4 | 91 | } |
1da177e4 | 92 | |
1da177e4 LT |
93 | } |
94 | ||
95 | void machine_restart(char * __unused) | |
96 | { | |
97 | extern void phys_stext(void); | |
98 | ||
99 | phys_stext(); | |
100 | } | |
101 | ||
102 | void machine_halt(void) | |
103 | { | |
104 | for (;;); | |
105 | } | |
106 | ||
107 | void machine_power_off(void) | |
108 | { | |
109 | extern void enter_deep_standby(void); | |
110 | ||
111 | enter_deep_standby(); | |
112 | } | |
113 | ||
1bb99a64 PM |
114 | void (*pm_power_off)(void) = machine_power_off; |
115 | EXPORT_SYMBOL(pm_power_off); | |
116 | ||
1da177e4 LT |
117 | void show_regs(struct pt_regs * regs) |
118 | { | |
119 | unsigned long long ah, al, bh, bl, ch, cl; | |
120 | ||
121 | printk("\n"); | |
122 | ||
123 | ah = (regs->pc) >> 32; | |
124 | al = (regs->pc) & 0xffffffff; | |
125 | bh = (regs->regs[18]) >> 32; | |
126 | bl = (regs->regs[18]) & 0xffffffff; | |
127 | ch = (regs->regs[15]) >> 32; | |
128 | cl = (regs->regs[15]) & 0xffffffff; | |
129 | printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n", | |
130 | ah, al, bh, bl, ch, cl); | |
131 | ||
132 | ah = (regs->sr) >> 32; | |
133 | al = (regs->sr) & 0xffffffff; | |
134 | asm volatile ("getcon " __TEA ", %0" : "=r" (bh)); | |
135 | asm volatile ("getcon " __TEA ", %0" : "=r" (bl)); | |
136 | bh = (bh) >> 32; | |
137 | bl = (bl) & 0xffffffff; | |
138 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch)); | |
139 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl)); | |
140 | ch = (ch) >> 32; | |
141 | cl = (cl) & 0xffffffff; | |
142 | printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n", | |
143 | ah, al, bh, bl, ch, cl); | |
144 | ||
145 | ah = (regs->regs[0]) >> 32; | |
146 | al = (regs->regs[0]) & 0xffffffff; | |
147 | bh = (regs->regs[1]) >> 32; | |
148 | bl = (regs->regs[1]) & 0xffffffff; | |
149 | ch = (regs->regs[2]) >> 32; | |
150 | cl = (regs->regs[2]) & 0xffffffff; | |
151 | printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n", | |
152 | ah, al, bh, bl, ch, cl); | |
153 | ||
154 | ah = (regs->regs[3]) >> 32; | |
155 | al = (regs->regs[3]) & 0xffffffff; | |
156 | bh = (regs->regs[4]) >> 32; | |
157 | bl = (regs->regs[4]) & 0xffffffff; | |
158 | ch = (regs->regs[5]) >> 32; | |
159 | cl = (regs->regs[5]) & 0xffffffff; | |
160 | printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n", | |
161 | ah, al, bh, bl, ch, cl); | |
162 | ||
163 | ah = (regs->regs[6]) >> 32; | |
164 | al = (regs->regs[6]) & 0xffffffff; | |
165 | bh = (regs->regs[7]) >> 32; | |
166 | bl = (regs->regs[7]) & 0xffffffff; | |
167 | ch = (regs->regs[8]) >> 32; | |
168 | cl = (regs->regs[8]) & 0xffffffff; | |
169 | printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n", | |
170 | ah, al, bh, bl, ch, cl); | |
171 | ||
172 | ah = (regs->regs[9]) >> 32; | |
173 | al = (regs->regs[9]) & 0xffffffff; | |
174 | bh = (regs->regs[10]) >> 32; | |
175 | bl = (regs->regs[10]) & 0xffffffff; | |
176 | ch = (regs->regs[11]) >> 32; | |
177 | cl = (regs->regs[11]) & 0xffffffff; | |
178 | printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n", | |
179 | ah, al, bh, bl, ch, cl); | |
180 | ||
181 | ah = (regs->regs[12]) >> 32; | |
182 | al = (regs->regs[12]) & 0xffffffff; | |
183 | bh = (regs->regs[13]) >> 32; | |
184 | bl = (regs->regs[13]) & 0xffffffff; | |
185 | ch = (regs->regs[14]) >> 32; | |
186 | cl = (regs->regs[14]) & 0xffffffff; | |
187 | printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n", | |
188 | ah, al, bh, bl, ch, cl); | |
189 | ||
190 | ah = (regs->regs[16]) >> 32; | |
191 | al = (regs->regs[16]) & 0xffffffff; | |
192 | bh = (regs->regs[17]) >> 32; | |
193 | bl = (regs->regs[17]) & 0xffffffff; | |
194 | ch = (regs->regs[19]) >> 32; | |
195 | cl = (regs->regs[19]) & 0xffffffff; | |
196 | printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n", | |
197 | ah, al, bh, bl, ch, cl); | |
198 | ||
199 | ah = (regs->regs[20]) >> 32; | |
200 | al = (regs->regs[20]) & 0xffffffff; | |
201 | bh = (regs->regs[21]) >> 32; | |
202 | bl = (regs->regs[21]) & 0xffffffff; | |
203 | ch = (regs->regs[22]) >> 32; | |
204 | cl = (regs->regs[22]) & 0xffffffff; | |
205 | printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n", | |
206 | ah, al, bh, bl, ch, cl); | |
207 | ||
208 | ah = (regs->regs[23]) >> 32; | |
209 | al = (regs->regs[23]) & 0xffffffff; | |
210 | bh = (regs->regs[24]) >> 32; | |
211 | bl = (regs->regs[24]) & 0xffffffff; | |
212 | ch = (regs->regs[25]) >> 32; | |
213 | cl = (regs->regs[25]) & 0xffffffff; | |
214 | printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n", | |
215 | ah, al, bh, bl, ch, cl); | |
216 | ||
217 | ah = (regs->regs[26]) >> 32; | |
218 | al = (regs->regs[26]) & 0xffffffff; | |
219 | bh = (regs->regs[27]) >> 32; | |
220 | bl = (regs->regs[27]) & 0xffffffff; | |
221 | ch = (regs->regs[28]) >> 32; | |
222 | cl = (regs->regs[28]) & 0xffffffff; | |
223 | printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n", | |
224 | ah, al, bh, bl, ch, cl); | |
225 | ||
226 | ah = (regs->regs[29]) >> 32; | |
227 | al = (regs->regs[29]) & 0xffffffff; | |
228 | bh = (regs->regs[30]) >> 32; | |
229 | bl = (regs->regs[30]) & 0xffffffff; | |
230 | ch = (regs->regs[31]) >> 32; | |
231 | cl = (regs->regs[31]) & 0xffffffff; | |
232 | printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n", | |
233 | ah, al, bh, bl, ch, cl); | |
234 | ||
235 | ah = (regs->regs[32]) >> 32; | |
236 | al = (regs->regs[32]) & 0xffffffff; | |
237 | bh = (regs->regs[33]) >> 32; | |
238 | bl = (regs->regs[33]) & 0xffffffff; | |
239 | ch = (regs->regs[34]) >> 32; | |
240 | cl = (regs->regs[34]) & 0xffffffff; | |
241 | printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n", | |
242 | ah, al, bh, bl, ch, cl); | |
243 | ||
244 | ah = (regs->regs[35]) >> 32; | |
245 | al = (regs->regs[35]) & 0xffffffff; | |
246 | bh = (regs->regs[36]) >> 32; | |
247 | bl = (regs->regs[36]) & 0xffffffff; | |
248 | ch = (regs->regs[37]) >> 32; | |
249 | cl = (regs->regs[37]) & 0xffffffff; | |
250 | printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n", | |
251 | ah, al, bh, bl, ch, cl); | |
252 | ||
253 | ah = (regs->regs[38]) >> 32; | |
254 | al = (regs->regs[38]) & 0xffffffff; | |
255 | bh = (regs->regs[39]) >> 32; | |
256 | bl = (regs->regs[39]) & 0xffffffff; | |
257 | ch = (regs->regs[40]) >> 32; | |
258 | cl = (regs->regs[40]) & 0xffffffff; | |
259 | printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n", | |
260 | ah, al, bh, bl, ch, cl); | |
261 | ||
262 | ah = (regs->regs[41]) >> 32; | |
263 | al = (regs->regs[41]) & 0xffffffff; | |
264 | bh = (regs->regs[42]) >> 32; | |
265 | bl = (regs->regs[42]) & 0xffffffff; | |
266 | ch = (regs->regs[43]) >> 32; | |
267 | cl = (regs->regs[43]) & 0xffffffff; | |
268 | printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n", | |
269 | ah, al, bh, bl, ch, cl); | |
270 | ||
271 | ah = (regs->regs[44]) >> 32; | |
272 | al = (regs->regs[44]) & 0xffffffff; | |
273 | bh = (regs->regs[45]) >> 32; | |
274 | bl = (regs->regs[45]) & 0xffffffff; | |
275 | ch = (regs->regs[46]) >> 32; | |
276 | cl = (regs->regs[46]) & 0xffffffff; | |
277 | printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n", | |
278 | ah, al, bh, bl, ch, cl); | |
279 | ||
280 | ah = (regs->regs[47]) >> 32; | |
281 | al = (regs->regs[47]) & 0xffffffff; | |
282 | bh = (regs->regs[48]) >> 32; | |
283 | bl = (regs->regs[48]) & 0xffffffff; | |
284 | ch = (regs->regs[49]) >> 32; | |
285 | cl = (regs->regs[49]) & 0xffffffff; | |
286 | printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n", | |
287 | ah, al, bh, bl, ch, cl); | |
288 | ||
289 | ah = (regs->regs[50]) >> 32; | |
290 | al = (regs->regs[50]) & 0xffffffff; | |
291 | bh = (regs->regs[51]) >> 32; | |
292 | bl = (regs->regs[51]) & 0xffffffff; | |
293 | ch = (regs->regs[52]) >> 32; | |
294 | cl = (regs->regs[52]) & 0xffffffff; | |
295 | printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n", | |
296 | ah, al, bh, bl, ch, cl); | |
297 | ||
298 | ah = (regs->regs[53]) >> 32; | |
299 | al = (regs->regs[53]) & 0xffffffff; | |
300 | bh = (regs->regs[54]) >> 32; | |
301 | bl = (regs->regs[54]) & 0xffffffff; | |
302 | ch = (regs->regs[55]) >> 32; | |
303 | cl = (regs->regs[55]) & 0xffffffff; | |
304 | printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n", | |
305 | ah, al, bh, bl, ch, cl); | |
306 | ||
307 | ah = (regs->regs[56]) >> 32; | |
308 | al = (regs->regs[56]) & 0xffffffff; | |
309 | bh = (regs->regs[57]) >> 32; | |
310 | bl = (regs->regs[57]) & 0xffffffff; | |
311 | ch = (regs->regs[58]) >> 32; | |
312 | cl = (regs->regs[58]) & 0xffffffff; | |
313 | printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n", | |
314 | ah, al, bh, bl, ch, cl); | |
315 | ||
316 | ah = (regs->regs[59]) >> 32; | |
317 | al = (regs->regs[59]) & 0xffffffff; | |
318 | bh = (regs->regs[60]) >> 32; | |
319 | bl = (regs->regs[60]) & 0xffffffff; | |
320 | ch = (regs->regs[61]) >> 32; | |
321 | cl = (regs->regs[61]) & 0xffffffff; | |
322 | printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n", | |
323 | ah, al, bh, bl, ch, cl); | |
324 | ||
325 | ah = (regs->regs[62]) >> 32; | |
326 | al = (regs->regs[62]) & 0xffffffff; | |
327 | bh = (regs->tregs[0]) >> 32; | |
328 | bl = (regs->tregs[0]) & 0xffffffff; | |
329 | ch = (regs->tregs[1]) >> 32; | |
330 | cl = (regs->tregs[1]) & 0xffffffff; | |
331 | printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n", | |
332 | ah, al, bh, bl, ch, cl); | |
333 | ||
334 | ah = (regs->tregs[2]) >> 32; | |
335 | al = (regs->tregs[2]) & 0xffffffff; | |
336 | bh = (regs->tregs[3]) >> 32; | |
337 | bl = (regs->tregs[3]) & 0xffffffff; | |
338 | ch = (regs->tregs[4]) >> 32; | |
339 | cl = (regs->tregs[4]) & 0xffffffff; | |
340 | printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n", | |
341 | ah, al, bh, bl, ch, cl); | |
342 | ||
343 | ah = (regs->tregs[5]) >> 32; | |
344 | al = (regs->tregs[5]) & 0xffffffff; | |
345 | bh = (regs->tregs[6]) >> 32; | |
346 | bl = (regs->tregs[6]) & 0xffffffff; | |
347 | ch = (regs->tregs[7]) >> 32; | |
348 | cl = (regs->tregs[7]) & 0xffffffff; | |
349 | printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n", | |
350 | ah, al, bh, bl, ch, cl); | |
351 | ||
352 | /* | |
353 | * If we're in kernel mode, dump the stack too.. | |
354 | */ | |
355 | if (!user_mode(regs)) { | |
356 | void show_stack(struct task_struct *tsk, unsigned long *sp); | |
357 | unsigned long sp = regs->regs[15] & 0xffffffff; | |
358 | struct task_struct *tsk = get_current(); | |
359 | ||
360 | tsk->thread.kregs = regs; | |
361 | ||
362 | show_stack(tsk, (unsigned long *)sp); | |
363 | } | |
364 | } | |
365 | ||
366 | struct task_struct * alloc_task_struct(void) | |
367 | { | |
368 | /* Get task descriptor pages */ | |
369 | return (struct task_struct *) | |
370 | __get_free_pages(GFP_KERNEL, get_order(THREAD_SIZE)); | |
371 | } | |
372 | ||
373 | void free_task_struct(struct task_struct *p) | |
374 | { | |
375 | free_pages((unsigned long) p, get_order(THREAD_SIZE)); | |
376 | } | |
377 | ||
378 | /* | |
379 | * Create a kernel thread | |
380 | */ | |
821278a7 AB |
381 | ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *)) |
382 | { | |
383 | do_exit(fn(arg)); | |
384 | } | |
1da177e4 LT |
385 | |
386 | /* | |
387 | * This is the mechanism for creating a new kernel thread. | |
388 | * | |
389 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
390 | * who haven't done an "execve()") should use this: it will work within | |
391 | * a system call from a "real" process, but the process memory space will | |
0a354775 | 392 | * not be freed until both the parent and the child have exited. |
1da177e4 LT |
393 | */ |
394 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
395 | { | |
821278a7 | 396 | struct pt_regs regs; |
1da177e4 | 397 | |
821278a7 AB |
398 | memset(®s, 0, sizeof(regs)); |
399 | regs.regs[2] = (unsigned long)arg; | |
400 | regs.regs[3] = (unsigned long)fn; | |
1da177e4 | 401 | |
821278a7 AB |
402 | regs.pc = (unsigned long)kernel_thread_helper; |
403 | regs.sr = (1 << 30); | |
1da177e4 | 404 | |
821278a7 AB |
405 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, |
406 | ®s, 0, NULL, NULL); | |
1da177e4 LT |
407 | } |
408 | ||
409 | /* | |
410 | * Free current thread data structures etc.. | |
411 | */ | |
412 | void exit_thread(void) | |
413 | { | |
414 | /* See arch/sparc/kernel/process.c for the precedent for doing this -- RPC. | |
415 | ||
416 | The SH-5 FPU save/restore approach relies on last_task_used_math | |
417 | pointing to a live task_struct. When another task tries to use the | |
418 | FPU for the 1st time, the FPUDIS trap handling (see | |
419 | arch/sh64/kernel/fpu.c) will save the existing FPU state to the | |
420 | FP regs field within last_task_used_math before re-loading the new | |
421 | task's FPU state (or initialising it if the FPU has been used | |
422 | before). So if last_task_used_math is stale, and its page has already been | |
423 | re-allocated for another use, the consequences are rather grim. Unless we | |
424 | null it here, there is no other path through which it would get safely | |
425 | nulled. */ | |
426 | ||
427 | #ifdef CONFIG_SH_FPU | |
428 | if (last_task_used_math == current) { | |
429 | last_task_used_math = NULL; | |
430 | } | |
431 | #endif | |
432 | } | |
433 | ||
434 | void flush_thread(void) | |
435 | { | |
436 | ||
437 | /* Called by fs/exec.c (flush_old_exec) to remove traces of a | |
438 | * previously running executable. */ | |
439 | #ifdef CONFIG_SH_FPU | |
440 | if (last_task_used_math == current) { | |
441 | last_task_used_math = NULL; | |
442 | } | |
443 | /* Force FPU state to be reinitialised after exec */ | |
444 | clear_used_math(); | |
445 | #endif | |
446 | ||
447 | /* if we are a kernel thread, about to change to user thread, | |
448 | * update kreg | |
449 | */ | |
450 | if(current->thread.kregs==&fake_swapper_regs) { | |
451 | current->thread.kregs = | |
452 | ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1); | |
453 | current->thread.uregs = current->thread.kregs; | |
454 | } | |
455 | } | |
456 | ||
457 | void release_thread(struct task_struct *dead_task) | |
458 | { | |
459 | /* do nothing */ | |
460 | } | |
461 | ||
462 | /* Fill in the fpu structure for a core dump.. */ | |
463 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
464 | { | |
465 | #ifdef CONFIG_SH_FPU | |
466 | int fpvalid; | |
467 | struct task_struct *tsk = current; | |
468 | ||
469 | fpvalid = !!tsk_used_math(tsk); | |
470 | if (fpvalid) { | |
471 | if (current == last_task_used_math) { | |
600ee240 | 472 | enable_fpu(); |
1da177e4 | 473 | fpsave(&tsk->thread.fpu.hard); |
600ee240 | 474 | disable_fpu(); |
1da177e4 LT |
475 | last_task_used_math = 0; |
476 | regs->sr |= SR_FD; | |
477 | } | |
478 | ||
479 | memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu)); | |
480 | } | |
481 | ||
482 | return fpvalid; | |
483 | #else | |
484 | return 0; /* Task didn't use the fpu at all. */ | |
485 | #endif | |
486 | } | |
487 | ||
488 | asmlinkage void ret_from_fork(void); | |
489 | ||
490 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, | |
491 | unsigned long unused, | |
492 | struct task_struct *p, struct pt_regs *regs) | |
493 | { | |
494 | struct pt_regs *childregs; | |
495 | unsigned long long se; /* Sign extension */ | |
496 | ||
497 | #ifdef CONFIG_SH_FPU | |
498 | if(last_task_used_math == current) { | |
600ee240 | 499 | enable_fpu(); |
1da177e4 | 500 | fpsave(¤t->thread.fpu.hard); |
600ee240 | 501 | disable_fpu(); |
1da177e4 LT |
502 | last_task_used_math = NULL; |
503 | regs->sr |= SR_FD; | |
504 | } | |
505 | #endif | |
506 | /* Copy from sh version */ | |
ee8c1dd4 | 507 | childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1; |
1da177e4 LT |
508 | |
509 | *childregs = *regs; | |
510 | ||
511 | if (user_mode(regs)) { | |
512 | childregs->regs[15] = usp; | |
513 | p->thread.uregs = childregs; | |
514 | } else { | |
ee8c1dd4 | 515 | childregs->regs[15] = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
1da177e4 LT |
516 | } |
517 | ||
518 | childregs->regs[9] = 0; /* Set return value for child */ | |
519 | childregs->sr |= SR_FD; /* Invalidate FPU flag */ | |
520 | ||
521 | p->thread.sp = (unsigned long) childregs; | |
522 | p->thread.pc = (unsigned long) ret_from_fork; | |
523 | ||
524 | /* | |
525 | * Sign extend the edited stack. | |
526 | * Note that thread.pc and thread.pc will stay | |
527 | * 32-bit wide and context switch must take care | |
528 | * of NEFF sign extension. | |
529 | */ | |
530 | ||
531 | se = childregs->regs[15]; | |
532 | se = (se & NEFF_SIGN) ? (se | NEFF_MASK) : se; | |
533 | childregs->regs[15] = se; | |
534 | ||
535 | return 0; | |
536 | } | |
537 | ||
1da177e4 LT |
538 | asmlinkage int sys_fork(unsigned long r2, unsigned long r3, |
539 | unsigned long r4, unsigned long r5, | |
540 | unsigned long r6, unsigned long r7, | |
541 | struct pt_regs *pregs) | |
542 | { | |
543 | return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); | |
544 | } | |
545 | ||
546 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
547 | unsigned long r4, unsigned long r5, | |
548 | unsigned long r6, unsigned long r7, | |
549 | struct pt_regs *pregs) | |
550 | { | |
551 | if (!newsp) | |
552 | newsp = pregs->regs[15]; | |
553 | return do_fork(clone_flags, newsp, pregs, 0, 0, 0); | |
554 | } | |
555 | ||
556 | /* | |
557 | * This is trivial, and on the face of it looks like it | |
558 | * could equally well be done in user mode. | |
559 | * | |
560 | * Not so, for quite unobvious reasons - register pressure. | |
561 | * In user mode vfork() cannot have a stack frame, and if | |
562 | * done by calling the "clone()" system call directly, you | |
563 | * do not have enough call-clobbered registers to hold all | |
564 | * the information you need. | |
565 | */ | |
566 | asmlinkage int sys_vfork(unsigned long r2, unsigned long r3, | |
567 | unsigned long r4, unsigned long r5, | |
568 | unsigned long r6, unsigned long r7, | |
569 | struct pt_regs *pregs) | |
570 | { | |
571 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); | |
572 | } | |
573 | ||
574 | /* | |
575 | * sys_execve() executes a new program. | |
576 | */ | |
577 | asmlinkage int sys_execve(char *ufilename, char **uargv, | |
578 | char **uenvp, unsigned long r5, | |
579 | unsigned long r6, unsigned long r7, | |
580 | struct pt_regs *pregs) | |
581 | { | |
582 | int error; | |
583 | char *filename; | |
584 | ||
585 | lock_kernel(); | |
586 | filename = getname((char __user *)ufilename); | |
587 | error = PTR_ERR(filename); | |
588 | if (IS_ERR(filename)) | |
589 | goto out; | |
590 | ||
591 | error = do_execve(filename, | |
592 | (char __user * __user *)uargv, | |
593 | (char __user * __user *)uenvp, | |
594 | pregs); | |
595 | if (error == 0) { | |
596 | task_lock(current); | |
597 | current->ptrace &= ~PT_DTRACE; | |
598 | task_unlock(current); | |
599 | } | |
600 | putname(filename); | |
601 | out: | |
602 | unlock_kernel(); | |
603 | return error; | |
604 | } | |
605 | ||
606 | /* | |
607 | * These bracket the sleeping functions.. | |
608 | */ | |
609 | extern void interruptible_sleep_on(wait_queue_head_t *q); | |
610 | ||
611 | #define mid_sched ((unsigned long) interruptible_sleep_on) | |
612 | ||
613 | static int in_sh64_switch_to(unsigned long pc) | |
614 | { | |
615 | extern char __sh64_switch_to_end; | |
616 | /* For a sleeping task, the PC is somewhere in the middle of the function, | |
617 | so we don't have to worry about masking the LSB off */ | |
618 | return (pc >= (unsigned long) sh64_switch_to) && | |
619 | (pc < (unsigned long) &__sh64_switch_to_end); | |
620 | } | |
621 | ||
622 | unsigned long get_wchan(struct task_struct *p) | |
623 | { | |
624 | unsigned long schedule_fp; | |
625 | unsigned long sh64_switch_to_fp; | |
626 | unsigned long schedule_caller_pc; | |
627 | unsigned long pc; | |
628 | ||
629 | if (!p || p == current || p->state == TASK_RUNNING) | |
630 | return 0; | |
631 | ||
632 | /* | |
633 | * The same comment as on the Alpha applies here, too ... | |
634 | */ | |
635 | pc = thread_saved_pc(p); | |
636 | ||
637 | #ifdef CONFIG_FRAME_POINTER | |
638 | if (in_sh64_switch_to(pc)) { | |
639 | sh64_switch_to_fp = (long) p->thread.sp; | |
640 | /* r14 is saved at offset 4 in the sh64_switch_to frame */ | |
641 | schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4); | |
642 | ||
643 | /* and the caller of 'schedule' is (currently!) saved at offset 24 | |
644 | in the frame of schedule (from disasm) */ | |
645 | schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24); | |
646 | return schedule_caller_pc; | |
647 | } | |
648 | #endif | |
649 | return pc; | |
650 | } | |
651 | ||
652 | /* Provide a /proc/asids file that lists out the | |
653 | ASIDs currently associated with the processes. (If the DM.PC register is | |
654 | examined through the debug link, this shows ASID + PC. To make use of this, | |
655 | the PID->ASID relationship needs to be known. This is primarily for | |
656 | debugging.) | |
657 | */ | |
658 | ||
659 | #if defined(CONFIG_SH64_PROC_ASIDS) | |
1da177e4 LT |
660 | static int |
661 | asids_proc_info(char *buf, char **start, off_t fpos, int length, int *eof, void *data) | |
662 | { | |
663 | int len=0; | |
664 | struct task_struct *p; | |
665 | read_lock(&tasklist_lock); | |
666 | for_each_process(p) { | |
667 | int pid = p->pid; | |
668 | struct mm_struct *mm; | |
669 | if (!pid) continue; | |
670 | mm = p->mm; | |
671 | if (mm) { | |
672 | unsigned long asid, context; | |
673 | context = mm->context; | |
674 | asid = (context & 0xff); | |
675 | len += sprintf(buf+len, "%5d : %02lx\n", pid, asid); | |
676 | } else { | |
677 | len += sprintf(buf+len, "%5d : (none)\n", pid); | |
678 | } | |
679 | } | |
680 | read_unlock(&tasklist_lock); | |
681 | *eof = 1; | |
682 | return len; | |
683 | } | |
684 | ||
685 | static int __init register_proc_asids(void) | |
686 | { | |
c26056bc PM |
687 | create_proc_read_entry("asids", 0, NULL, asids_proc_info, NULL); |
688 | return 0; | |
1da177e4 | 689 | } |
1da177e4 LT |
690 | __initcall(register_proc_asids); |
691 | #endif |