Commit | Line | Data |
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1da177e4 | 1 | /* |
5a4f7c66 | 2 | * arch/sh/kernel/process_64.c |
1da177e4 | 3 | * |
5a4f7c66 | 4 | * This file handles the architecture-dependent parts of process handling.. |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
5a4f7c66 | 7 | * Copyright (C) 2003 - 2007 Paul Mundt |
1da177e4 LT |
8 | * Copyright (C) 2003, 2004 Richard Curnow |
9 | * | |
10 | * Started from SH3/4 version: | |
11 | * Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima | |
12 | * | |
13 | * In turn started from i386 version: | |
14 | * Copyright (C) 1995 Linus Torvalds | |
15 | * | |
5a4f7c66 PM |
16 | * This file is subject to the terms and conditions of the GNU General Public |
17 | * License. See the file "COPYING" in the main directory of this archive | |
18 | * for more details. | |
1da177e4 | 19 | */ |
1da177e4 | 20 | #include <linux/mm.h> |
78d98277 | 21 | #include <linux/fs.h> |
1da177e4 | 22 | #include <linux/ptrace.h> |
1da177e4 LT |
23 | #include <linux/reboot.h> |
24 | #include <linux/init.h> | |
821278a7 | 25 | #include <linux/module.h> |
c26056bc | 26 | #include <linux/proc_fs.h> |
a7aa92d1 | 27 | #include <linux/io.h> |
1da177e4 LT |
28 | #include <asm/uaccess.h> |
29 | #include <asm/pgtable.h> | |
df0fb256 | 30 | #include <asm/mmu_context.h> |
1da177e4 LT |
31 | |
32 | struct task_struct *last_task_used_math = NULL; | |
33 | ||
1da177e4 LT |
34 | static int hlt_counter = 1; |
35 | ||
36 | #define HARD_IDLE_TIMEOUT (HZ / 3) | |
37 | ||
38 | void disable_hlt(void) | |
39 | { | |
40 | hlt_counter++; | |
41 | } | |
42 | ||
43 | void enable_hlt(void) | |
44 | { | |
45 | hlt_counter--; | |
46 | } | |
47 | ||
48 | static int __init nohlt_setup(char *__unused) | |
49 | { | |
50 | hlt_counter = 1; | |
51 | return 1; | |
52 | } | |
53 | ||
54 | static int __init hlt_setup(char *__unused) | |
55 | { | |
56 | hlt_counter = 0; | |
57 | return 1; | |
58 | } | |
59 | ||
60 | __setup("nohlt", nohlt_setup); | |
61 | __setup("hlt", hlt_setup); | |
62 | ||
63 | static inline void hlt(void) | |
64 | { | |
1da177e4 LT |
65 | __asm__ __volatile__ ("sleep" : : : "memory"); |
66 | } | |
67 | ||
68 | /* | |
69 | * The idle loop on a uniprocessor SH.. | |
70 | */ | |
64c7c8f8 | 71 | void cpu_idle(void) |
1da177e4 LT |
72 | { |
73 | /* endless idle loop with no priority at all */ | |
74 | while (1) { | |
75 | if (hlt_counter) { | |
64c7c8f8 NP |
76 | while (!need_resched()) |
77 | cpu_relax(); | |
1da177e4 LT |
78 | } else { |
79 | local_irq_disable(); | |
80 | while (!need_resched()) { | |
81 | local_irq_enable(); | |
1da177e4 LT |
82 | hlt(); |
83 | local_irq_disable(); | |
84 | } | |
85 | local_irq_enable(); | |
86 | } | |
5bfb5d69 | 87 | preempt_enable_no_resched(); |
1da177e4 | 88 | schedule(); |
5bfb5d69 | 89 | preempt_disable(); |
1da177e4 | 90 | } |
1da177e4 | 91 | |
1da177e4 LT |
92 | } |
93 | ||
94 | void machine_restart(char * __unused) | |
95 | { | |
96 | extern void phys_stext(void); | |
97 | ||
98 | phys_stext(); | |
99 | } | |
100 | ||
101 | void machine_halt(void) | |
102 | { | |
103 | for (;;); | |
104 | } | |
105 | ||
106 | void machine_power_off(void) | |
107 | { | |
a7aa92d1 PM |
108 | #if 0 |
109 | /* Disable watchdog timer */ | |
110 | ctrl_outl(0xa5000000, WTCSR); | |
111 | /* Configure deep standby on sleep */ | |
112 | ctrl_outl(0x03, STBCR); | |
113 | #endif | |
114 | ||
115 | __asm__ __volatile__ ( | |
116 | "sleep\n\t" | |
117 | "synci\n\t" | |
118 | "nop;nop;nop;nop\n\t" | |
119 | ); | |
120 | ||
121 | panic("Unexpected wakeup!\n"); | |
1da177e4 LT |
122 | } |
123 | ||
1bb99a64 PM |
124 | void (*pm_power_off)(void) = machine_power_off; |
125 | EXPORT_SYMBOL(pm_power_off); | |
126 | ||
1da177e4 LT |
127 | void show_regs(struct pt_regs * regs) |
128 | { | |
129 | unsigned long long ah, al, bh, bl, ch, cl; | |
130 | ||
131 | printk("\n"); | |
132 | ||
133 | ah = (regs->pc) >> 32; | |
134 | al = (regs->pc) & 0xffffffff; | |
135 | bh = (regs->regs[18]) >> 32; | |
136 | bl = (regs->regs[18]) & 0xffffffff; | |
137 | ch = (regs->regs[15]) >> 32; | |
138 | cl = (regs->regs[15]) & 0xffffffff; | |
139 | printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n", | |
140 | ah, al, bh, bl, ch, cl); | |
141 | ||
142 | ah = (regs->sr) >> 32; | |
143 | al = (regs->sr) & 0xffffffff; | |
144 | asm volatile ("getcon " __TEA ", %0" : "=r" (bh)); | |
145 | asm volatile ("getcon " __TEA ", %0" : "=r" (bl)); | |
146 | bh = (bh) >> 32; | |
147 | bl = (bl) & 0xffffffff; | |
148 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch)); | |
149 | asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl)); | |
150 | ch = (ch) >> 32; | |
151 | cl = (cl) & 0xffffffff; | |
152 | printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n", | |
153 | ah, al, bh, bl, ch, cl); | |
154 | ||
155 | ah = (regs->regs[0]) >> 32; | |
156 | al = (regs->regs[0]) & 0xffffffff; | |
157 | bh = (regs->regs[1]) >> 32; | |
158 | bl = (regs->regs[1]) & 0xffffffff; | |
159 | ch = (regs->regs[2]) >> 32; | |
160 | cl = (regs->regs[2]) & 0xffffffff; | |
161 | printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n", | |
162 | ah, al, bh, bl, ch, cl); | |
163 | ||
164 | ah = (regs->regs[3]) >> 32; | |
165 | al = (regs->regs[3]) & 0xffffffff; | |
166 | bh = (regs->regs[4]) >> 32; | |
167 | bl = (regs->regs[4]) & 0xffffffff; | |
168 | ch = (regs->regs[5]) >> 32; | |
169 | cl = (regs->regs[5]) & 0xffffffff; | |
170 | printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n", | |
171 | ah, al, bh, bl, ch, cl); | |
172 | ||
173 | ah = (regs->regs[6]) >> 32; | |
174 | al = (regs->regs[6]) & 0xffffffff; | |
175 | bh = (regs->regs[7]) >> 32; | |
176 | bl = (regs->regs[7]) & 0xffffffff; | |
177 | ch = (regs->regs[8]) >> 32; | |
178 | cl = (regs->regs[8]) & 0xffffffff; | |
179 | printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n", | |
180 | ah, al, bh, bl, ch, cl); | |
181 | ||
182 | ah = (regs->regs[9]) >> 32; | |
183 | al = (regs->regs[9]) & 0xffffffff; | |
184 | bh = (regs->regs[10]) >> 32; | |
185 | bl = (regs->regs[10]) & 0xffffffff; | |
186 | ch = (regs->regs[11]) >> 32; | |
187 | cl = (regs->regs[11]) & 0xffffffff; | |
188 | printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n", | |
189 | ah, al, bh, bl, ch, cl); | |
190 | ||
191 | ah = (regs->regs[12]) >> 32; | |
192 | al = (regs->regs[12]) & 0xffffffff; | |
193 | bh = (regs->regs[13]) >> 32; | |
194 | bl = (regs->regs[13]) & 0xffffffff; | |
195 | ch = (regs->regs[14]) >> 32; | |
196 | cl = (regs->regs[14]) & 0xffffffff; | |
197 | printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n", | |
198 | ah, al, bh, bl, ch, cl); | |
199 | ||
200 | ah = (regs->regs[16]) >> 32; | |
201 | al = (regs->regs[16]) & 0xffffffff; | |
202 | bh = (regs->regs[17]) >> 32; | |
203 | bl = (regs->regs[17]) & 0xffffffff; | |
204 | ch = (regs->regs[19]) >> 32; | |
205 | cl = (regs->regs[19]) & 0xffffffff; | |
206 | printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n", | |
207 | ah, al, bh, bl, ch, cl); | |
208 | ||
209 | ah = (regs->regs[20]) >> 32; | |
210 | al = (regs->regs[20]) & 0xffffffff; | |
211 | bh = (regs->regs[21]) >> 32; | |
212 | bl = (regs->regs[21]) & 0xffffffff; | |
213 | ch = (regs->regs[22]) >> 32; | |
214 | cl = (regs->regs[22]) & 0xffffffff; | |
215 | printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n", | |
216 | ah, al, bh, bl, ch, cl); | |
217 | ||
218 | ah = (regs->regs[23]) >> 32; | |
219 | al = (regs->regs[23]) & 0xffffffff; | |
220 | bh = (regs->regs[24]) >> 32; | |
221 | bl = (regs->regs[24]) & 0xffffffff; | |
222 | ch = (regs->regs[25]) >> 32; | |
223 | cl = (regs->regs[25]) & 0xffffffff; | |
224 | printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n", | |
225 | ah, al, bh, bl, ch, cl); | |
226 | ||
227 | ah = (regs->regs[26]) >> 32; | |
228 | al = (regs->regs[26]) & 0xffffffff; | |
229 | bh = (regs->regs[27]) >> 32; | |
230 | bl = (regs->regs[27]) & 0xffffffff; | |
231 | ch = (regs->regs[28]) >> 32; | |
232 | cl = (regs->regs[28]) & 0xffffffff; | |
233 | printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n", | |
234 | ah, al, bh, bl, ch, cl); | |
235 | ||
236 | ah = (regs->regs[29]) >> 32; | |
237 | al = (regs->regs[29]) & 0xffffffff; | |
238 | bh = (regs->regs[30]) >> 32; | |
239 | bl = (regs->regs[30]) & 0xffffffff; | |
240 | ch = (regs->regs[31]) >> 32; | |
241 | cl = (regs->regs[31]) & 0xffffffff; | |
242 | printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n", | |
243 | ah, al, bh, bl, ch, cl); | |
244 | ||
245 | ah = (regs->regs[32]) >> 32; | |
246 | al = (regs->regs[32]) & 0xffffffff; | |
247 | bh = (regs->regs[33]) >> 32; | |
248 | bl = (regs->regs[33]) & 0xffffffff; | |
249 | ch = (regs->regs[34]) >> 32; | |
250 | cl = (regs->regs[34]) & 0xffffffff; | |
251 | printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n", | |
252 | ah, al, bh, bl, ch, cl); | |
253 | ||
254 | ah = (regs->regs[35]) >> 32; | |
255 | al = (regs->regs[35]) & 0xffffffff; | |
256 | bh = (regs->regs[36]) >> 32; | |
257 | bl = (regs->regs[36]) & 0xffffffff; | |
258 | ch = (regs->regs[37]) >> 32; | |
259 | cl = (regs->regs[37]) & 0xffffffff; | |
260 | printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n", | |
261 | ah, al, bh, bl, ch, cl); | |
262 | ||
263 | ah = (regs->regs[38]) >> 32; | |
264 | al = (regs->regs[38]) & 0xffffffff; | |
265 | bh = (regs->regs[39]) >> 32; | |
266 | bl = (regs->regs[39]) & 0xffffffff; | |
267 | ch = (regs->regs[40]) >> 32; | |
268 | cl = (regs->regs[40]) & 0xffffffff; | |
269 | printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n", | |
270 | ah, al, bh, bl, ch, cl); | |
271 | ||
272 | ah = (regs->regs[41]) >> 32; | |
273 | al = (regs->regs[41]) & 0xffffffff; | |
274 | bh = (regs->regs[42]) >> 32; | |
275 | bl = (regs->regs[42]) & 0xffffffff; | |
276 | ch = (regs->regs[43]) >> 32; | |
277 | cl = (regs->regs[43]) & 0xffffffff; | |
278 | printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n", | |
279 | ah, al, bh, bl, ch, cl); | |
280 | ||
281 | ah = (regs->regs[44]) >> 32; | |
282 | al = (regs->regs[44]) & 0xffffffff; | |
283 | bh = (regs->regs[45]) >> 32; | |
284 | bl = (regs->regs[45]) & 0xffffffff; | |
285 | ch = (regs->regs[46]) >> 32; | |
286 | cl = (regs->regs[46]) & 0xffffffff; | |
287 | printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n", | |
288 | ah, al, bh, bl, ch, cl); | |
289 | ||
290 | ah = (regs->regs[47]) >> 32; | |
291 | al = (regs->regs[47]) & 0xffffffff; | |
292 | bh = (regs->regs[48]) >> 32; | |
293 | bl = (regs->regs[48]) & 0xffffffff; | |
294 | ch = (regs->regs[49]) >> 32; | |
295 | cl = (regs->regs[49]) & 0xffffffff; | |
296 | printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n", | |
297 | ah, al, bh, bl, ch, cl); | |
298 | ||
299 | ah = (regs->regs[50]) >> 32; | |
300 | al = (regs->regs[50]) & 0xffffffff; | |
301 | bh = (regs->regs[51]) >> 32; | |
302 | bl = (regs->regs[51]) & 0xffffffff; | |
303 | ch = (regs->regs[52]) >> 32; | |
304 | cl = (regs->regs[52]) & 0xffffffff; | |
305 | printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n", | |
306 | ah, al, bh, bl, ch, cl); | |
307 | ||
308 | ah = (regs->regs[53]) >> 32; | |
309 | al = (regs->regs[53]) & 0xffffffff; | |
310 | bh = (regs->regs[54]) >> 32; | |
311 | bl = (regs->regs[54]) & 0xffffffff; | |
312 | ch = (regs->regs[55]) >> 32; | |
313 | cl = (regs->regs[55]) & 0xffffffff; | |
314 | printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n", | |
315 | ah, al, bh, bl, ch, cl); | |
316 | ||
317 | ah = (regs->regs[56]) >> 32; | |
318 | al = (regs->regs[56]) & 0xffffffff; | |
319 | bh = (regs->regs[57]) >> 32; | |
320 | bl = (regs->regs[57]) & 0xffffffff; | |
321 | ch = (regs->regs[58]) >> 32; | |
322 | cl = (regs->regs[58]) & 0xffffffff; | |
323 | printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n", | |
324 | ah, al, bh, bl, ch, cl); | |
325 | ||
326 | ah = (regs->regs[59]) >> 32; | |
327 | al = (regs->regs[59]) & 0xffffffff; | |
328 | bh = (regs->regs[60]) >> 32; | |
329 | bl = (regs->regs[60]) & 0xffffffff; | |
330 | ch = (regs->regs[61]) >> 32; | |
331 | cl = (regs->regs[61]) & 0xffffffff; | |
332 | printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n", | |
333 | ah, al, bh, bl, ch, cl); | |
334 | ||
335 | ah = (regs->regs[62]) >> 32; | |
336 | al = (regs->regs[62]) & 0xffffffff; | |
337 | bh = (regs->tregs[0]) >> 32; | |
338 | bl = (regs->tregs[0]) & 0xffffffff; | |
339 | ch = (regs->tregs[1]) >> 32; | |
340 | cl = (regs->tregs[1]) & 0xffffffff; | |
341 | printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n", | |
342 | ah, al, bh, bl, ch, cl); | |
343 | ||
344 | ah = (regs->tregs[2]) >> 32; | |
345 | al = (regs->tregs[2]) & 0xffffffff; | |
346 | bh = (regs->tregs[3]) >> 32; | |
347 | bl = (regs->tregs[3]) & 0xffffffff; | |
348 | ch = (regs->tregs[4]) >> 32; | |
349 | cl = (regs->tregs[4]) & 0xffffffff; | |
350 | printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n", | |
351 | ah, al, bh, bl, ch, cl); | |
352 | ||
353 | ah = (regs->tregs[5]) >> 32; | |
354 | al = (regs->tregs[5]) & 0xffffffff; | |
355 | bh = (regs->tregs[6]) >> 32; | |
356 | bl = (regs->tregs[6]) & 0xffffffff; | |
357 | ch = (regs->tregs[7]) >> 32; | |
358 | cl = (regs->tregs[7]) & 0xffffffff; | |
359 | printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n", | |
360 | ah, al, bh, bl, ch, cl); | |
361 | ||
362 | /* | |
363 | * If we're in kernel mode, dump the stack too.. | |
364 | */ | |
365 | if (!user_mode(regs)) { | |
366 | void show_stack(struct task_struct *tsk, unsigned long *sp); | |
367 | unsigned long sp = regs->regs[15] & 0xffffffff; | |
368 | struct task_struct *tsk = get_current(); | |
369 | ||
370 | tsk->thread.kregs = regs; | |
371 | ||
372 | show_stack(tsk, (unsigned long *)sp); | |
373 | } | |
374 | } | |
375 | ||
376 | struct task_struct * alloc_task_struct(void) | |
377 | { | |
378 | /* Get task descriptor pages */ | |
379 | return (struct task_struct *) | |
380 | __get_free_pages(GFP_KERNEL, get_order(THREAD_SIZE)); | |
381 | } | |
382 | ||
383 | void free_task_struct(struct task_struct *p) | |
384 | { | |
385 | free_pages((unsigned long) p, get_order(THREAD_SIZE)); | |
386 | } | |
387 | ||
388 | /* | |
389 | * Create a kernel thread | |
390 | */ | |
821278a7 AB |
391 | ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *)) |
392 | { | |
393 | do_exit(fn(arg)); | |
394 | } | |
1da177e4 LT |
395 | |
396 | /* | |
397 | * This is the mechanism for creating a new kernel thread. | |
398 | * | |
399 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
400 | * who haven't done an "execve()") should use this: it will work within | |
401 | * a system call from a "real" process, but the process memory space will | |
0a354775 | 402 | * not be freed until both the parent and the child have exited. |
1da177e4 LT |
403 | */ |
404 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
405 | { | |
821278a7 | 406 | struct pt_regs regs; |
1da177e4 | 407 | |
821278a7 AB |
408 | memset(®s, 0, sizeof(regs)); |
409 | regs.regs[2] = (unsigned long)arg; | |
410 | regs.regs[3] = (unsigned long)fn; | |
1da177e4 | 411 | |
821278a7 AB |
412 | regs.pc = (unsigned long)kernel_thread_helper; |
413 | regs.sr = (1 << 30); | |
1da177e4 | 414 | |
821278a7 AB |
415 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, |
416 | ®s, 0, NULL, NULL); | |
1da177e4 LT |
417 | } |
418 | ||
419 | /* | |
420 | * Free current thread data structures etc.. | |
421 | */ | |
422 | void exit_thread(void) | |
423 | { | |
a23ba435 PM |
424 | /* |
425 | * See arch/sparc/kernel/process.c for the precedent for doing | |
426 | * this -- RPC. | |
427 | * | |
428 | * The SH-5 FPU save/restore approach relies on | |
429 | * last_task_used_math pointing to a live task_struct. When | |
430 | * another task tries to use the FPU for the 1st time, the FPUDIS | |
431 | * trap handling (see arch/sh/kernel/cpu/sh5/fpu.c) will save the | |
432 | * existing FPU state to the FP regs field within | |
433 | * last_task_used_math before re-loading the new task's FPU state | |
434 | * (or initialising it if the FPU has been used before). So if | |
435 | * last_task_used_math is stale, and its page has already been | |
436 | * re-allocated for another use, the consequences are rather | |
437 | * grim. Unless we null it here, there is no other path through | |
438 | * which it would get safely nulled. | |
439 | */ | |
1da177e4 LT |
440 | #ifdef CONFIG_SH_FPU |
441 | if (last_task_used_math == current) { | |
442 | last_task_used_math = NULL; | |
443 | } | |
444 | #endif | |
445 | } | |
446 | ||
447 | void flush_thread(void) | |
448 | { | |
449 | ||
450 | /* Called by fs/exec.c (flush_old_exec) to remove traces of a | |
451 | * previously running executable. */ | |
452 | #ifdef CONFIG_SH_FPU | |
453 | if (last_task_used_math == current) { | |
454 | last_task_used_math = NULL; | |
455 | } | |
456 | /* Force FPU state to be reinitialised after exec */ | |
457 | clear_used_math(); | |
458 | #endif | |
459 | ||
460 | /* if we are a kernel thread, about to change to user thread, | |
461 | * update kreg | |
462 | */ | |
463 | if(current->thread.kregs==&fake_swapper_regs) { | |
464 | current->thread.kregs = | |
465 | ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1); | |
466 | current->thread.uregs = current->thread.kregs; | |
467 | } | |
468 | } | |
469 | ||
470 | void release_thread(struct task_struct *dead_task) | |
471 | { | |
472 | /* do nothing */ | |
473 | } | |
474 | ||
475 | /* Fill in the fpu structure for a core dump.. */ | |
476 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
477 | { | |
478 | #ifdef CONFIG_SH_FPU | |
479 | int fpvalid; | |
480 | struct task_struct *tsk = current; | |
481 | ||
482 | fpvalid = !!tsk_used_math(tsk); | |
483 | if (fpvalid) { | |
484 | if (current == last_task_used_math) { | |
600ee240 | 485 | enable_fpu(); |
332fd57b | 486 | save_fpu(tsk, regs); |
600ee240 | 487 | disable_fpu(); |
1da177e4 LT |
488 | last_task_used_math = 0; |
489 | regs->sr |= SR_FD; | |
490 | } | |
491 | ||
492 | memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu)); | |
493 | } | |
494 | ||
495 | return fpvalid; | |
496 | #else | |
497 | return 0; /* Task didn't use the fpu at all. */ | |
498 | #endif | |
499 | } | |
500 | ||
501 | asmlinkage void ret_from_fork(void); | |
502 | ||
503 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, | |
504 | unsigned long unused, | |
505 | struct task_struct *p, struct pt_regs *regs) | |
506 | { | |
507 | struct pt_regs *childregs; | |
508 | unsigned long long se; /* Sign extension */ | |
509 | ||
510 | #ifdef CONFIG_SH_FPU | |
511 | if(last_task_used_math == current) { | |
600ee240 | 512 | enable_fpu(); |
332fd57b | 513 | save_fpu(current, regs); |
600ee240 | 514 | disable_fpu(); |
1da177e4 LT |
515 | last_task_used_math = NULL; |
516 | regs->sr |= SR_FD; | |
517 | } | |
518 | #endif | |
519 | /* Copy from sh version */ | |
ee8c1dd4 | 520 | childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1; |
1da177e4 LT |
521 | |
522 | *childregs = *regs; | |
523 | ||
524 | if (user_mode(regs)) { | |
525 | childregs->regs[15] = usp; | |
526 | p->thread.uregs = childregs; | |
527 | } else { | |
ee8c1dd4 | 528 | childregs->regs[15] = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
1da177e4 LT |
529 | } |
530 | ||
531 | childregs->regs[9] = 0; /* Set return value for child */ | |
532 | childregs->sr |= SR_FD; /* Invalidate FPU flag */ | |
533 | ||
534 | p->thread.sp = (unsigned long) childregs; | |
535 | p->thread.pc = (unsigned long) ret_from_fork; | |
536 | ||
537 | /* | |
538 | * Sign extend the edited stack. | |
539 | * Note that thread.pc and thread.pc will stay | |
540 | * 32-bit wide and context switch must take care | |
541 | * of NEFF sign extension. | |
542 | */ | |
543 | ||
544 | se = childregs->regs[15]; | |
545 | se = (se & NEFF_SIGN) ? (se | NEFF_MASK) : se; | |
546 | childregs->regs[15] = se; | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
1da177e4 LT |
551 | asmlinkage int sys_fork(unsigned long r2, unsigned long r3, |
552 | unsigned long r4, unsigned long r5, | |
553 | unsigned long r6, unsigned long r7, | |
554 | struct pt_regs *pregs) | |
555 | { | |
556 | return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); | |
557 | } | |
558 | ||
559 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
560 | unsigned long r4, unsigned long r5, | |
561 | unsigned long r6, unsigned long r7, | |
562 | struct pt_regs *pregs) | |
563 | { | |
564 | if (!newsp) | |
565 | newsp = pregs->regs[15]; | |
566 | return do_fork(clone_flags, newsp, pregs, 0, 0, 0); | |
567 | } | |
568 | ||
569 | /* | |
570 | * This is trivial, and on the face of it looks like it | |
571 | * could equally well be done in user mode. | |
572 | * | |
573 | * Not so, for quite unobvious reasons - register pressure. | |
574 | * In user mode vfork() cannot have a stack frame, and if | |
575 | * done by calling the "clone()" system call directly, you | |
576 | * do not have enough call-clobbered registers to hold all | |
577 | * the information you need. | |
578 | */ | |
579 | asmlinkage int sys_vfork(unsigned long r2, unsigned long r3, | |
580 | unsigned long r4, unsigned long r5, | |
581 | unsigned long r6, unsigned long r7, | |
582 | struct pt_regs *pregs) | |
583 | { | |
584 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0); | |
585 | } | |
586 | ||
587 | /* | |
588 | * sys_execve() executes a new program. | |
589 | */ | |
590 | asmlinkage int sys_execve(char *ufilename, char **uargv, | |
591 | char **uenvp, unsigned long r5, | |
592 | unsigned long r6, unsigned long r7, | |
593 | struct pt_regs *pregs) | |
594 | { | |
595 | int error; | |
596 | char *filename; | |
597 | ||
598 | lock_kernel(); | |
599 | filename = getname((char __user *)ufilename); | |
600 | error = PTR_ERR(filename); | |
601 | if (IS_ERR(filename)) | |
602 | goto out; | |
603 | ||
604 | error = do_execve(filename, | |
605 | (char __user * __user *)uargv, | |
606 | (char __user * __user *)uenvp, | |
607 | pregs); | |
608 | if (error == 0) { | |
609 | task_lock(current); | |
610 | current->ptrace &= ~PT_DTRACE; | |
611 | task_unlock(current); | |
612 | } | |
613 | putname(filename); | |
614 | out: | |
615 | unlock_kernel(); | |
616 | return error; | |
617 | } | |
618 | ||
619 | /* | |
620 | * These bracket the sleeping functions.. | |
621 | */ | |
622 | extern void interruptible_sleep_on(wait_queue_head_t *q); | |
623 | ||
624 | #define mid_sched ((unsigned long) interruptible_sleep_on) | |
625 | ||
626 | static int in_sh64_switch_to(unsigned long pc) | |
627 | { | |
628 | extern char __sh64_switch_to_end; | |
629 | /* For a sleeping task, the PC is somewhere in the middle of the function, | |
630 | so we don't have to worry about masking the LSB off */ | |
631 | return (pc >= (unsigned long) sh64_switch_to) && | |
632 | (pc < (unsigned long) &__sh64_switch_to_end); | |
633 | } | |
634 | ||
635 | unsigned long get_wchan(struct task_struct *p) | |
636 | { | |
637 | unsigned long schedule_fp; | |
638 | unsigned long sh64_switch_to_fp; | |
639 | unsigned long schedule_caller_pc; | |
640 | unsigned long pc; | |
641 | ||
642 | if (!p || p == current || p->state == TASK_RUNNING) | |
643 | return 0; | |
644 | ||
645 | /* | |
646 | * The same comment as on the Alpha applies here, too ... | |
647 | */ | |
648 | pc = thread_saved_pc(p); | |
649 | ||
650 | #ifdef CONFIG_FRAME_POINTER | |
651 | if (in_sh64_switch_to(pc)) { | |
652 | sh64_switch_to_fp = (long) p->thread.sp; | |
653 | /* r14 is saved at offset 4 in the sh64_switch_to frame */ | |
654 | schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4); | |
655 | ||
656 | /* and the caller of 'schedule' is (currently!) saved at offset 24 | |
657 | in the frame of schedule (from disasm) */ | |
658 | schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24); | |
659 | return schedule_caller_pc; | |
660 | } | |
661 | #endif | |
662 | return pc; | |
663 | } | |
664 | ||
665 | /* Provide a /proc/asids file that lists out the | |
666 | ASIDs currently associated with the processes. (If the DM.PC register is | |
667 | examined through the debug link, this shows ASID + PC. To make use of this, | |
668 | the PID->ASID relationship needs to be known. This is primarily for | |
669 | debugging.) | |
670 | */ | |
671 | ||
672 | #if defined(CONFIG_SH64_PROC_ASIDS) | |
1da177e4 LT |
673 | static int |
674 | asids_proc_info(char *buf, char **start, off_t fpos, int length, int *eof, void *data) | |
675 | { | |
676 | int len=0; | |
677 | struct task_struct *p; | |
678 | read_lock(&tasklist_lock); | |
679 | for_each_process(p) { | |
680 | int pid = p->pid; | |
df0fb256 PM |
681 | |
682 | if (!pid) | |
683 | continue; | |
684 | if (p->mm) | |
685 | len += sprintf(buf+len, "%5d : %02lx\n", pid, | |
686 | asid_cache(smp_processor_id())); | |
687 | else | |
1da177e4 | 688 | len += sprintf(buf+len, "%5d : (none)\n", pid); |
1da177e4 LT |
689 | } |
690 | read_unlock(&tasklist_lock); | |
691 | *eof = 1; | |
692 | return len; | |
693 | } | |
694 | ||
695 | static int __init register_proc_asids(void) | |
696 | { | |
c26056bc PM |
697 | create_proc_read_entry("asids", 0, NULL, asids_proc_info, NULL); |
698 | return 0; | |
1da177e4 | 699 | } |
1da177e4 LT |
700 | __initcall(register_proc_asids); |
701 | #endif |