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1da177e4 LT |
1 | /* $Id: process.c,v 1.28 2004/05/05 16:54:23 lethal Exp $ |
2 | * | |
3 | * linux/arch/sh/kernel/process.c | |
4 | * | |
5 | * Copyright (C) 1995 Linus Torvalds | |
6 | * | |
7 | * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima | |
8 | */ | |
9 | ||
10 | /* | |
11 | * This file handles the architecture-dependent parts of process handling.. | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/unistd.h> | |
16 | #include <linux/mm.h> | |
17 | #include <linux/elfcore.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/a.out.h> | |
20 | #include <linux/ptrace.h> | |
21 | #include <linux/platform.h> | |
22 | #include <linux/kallsyms.h> | |
23 | ||
24 | #include <asm/io.h> | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/mmu_context.h> | |
27 | #include <asm/elf.h> | |
28 | #if defined(CONFIG_SH_HS7751RVOIP) | |
29 | #include <asm/hs7751rvoip/hs7751rvoip.h> | |
30 | #elif defined(CONFIG_SH_RTS7751R2D) | |
31 | #include <asm/rts7751r2d/rts7751r2d.h> | |
32 | #endif | |
33 | ||
34 | static int hlt_counter=0; | |
35 | ||
36 | int ubc_usercnt = 0; | |
37 | ||
38 | #define HARD_IDLE_TIMEOUT (HZ / 3) | |
39 | ||
40 | void disable_hlt(void) | |
41 | { | |
42 | hlt_counter++; | |
43 | } | |
44 | ||
45 | EXPORT_SYMBOL(disable_hlt); | |
46 | ||
47 | void enable_hlt(void) | |
48 | { | |
49 | hlt_counter--; | |
50 | } | |
51 | ||
52 | EXPORT_SYMBOL(enable_hlt); | |
53 | ||
54 | void default_idle(void) | |
55 | { | |
56 | /* endless idle loop with no priority at all */ | |
57 | while (1) { | |
58 | if (hlt_counter) { | |
59 | while (1) | |
60 | if (need_resched()) | |
61 | break; | |
62 | } else { | |
63 | while (!need_resched()) | |
64 | cpu_sleep(); | |
65 | } | |
66 | ||
67 | schedule(); | |
68 | } | |
69 | } | |
70 | ||
71 | void cpu_idle(void) | |
72 | { | |
73 | default_idle(); | |
74 | } | |
75 | ||
76 | void machine_restart(char * __unused) | |
77 | { | |
78 | /* SR.BL=1 and invoke address error to let CPU reset (manual reset) */ | |
79 | asm volatile("ldc %0, sr\n\t" | |
80 | "mov.l @%1, %0" : : "r" (0x10000000), "r" (0x80000001)); | |
81 | } | |
82 | ||
83 | EXPORT_SYMBOL(machine_restart); | |
84 | ||
85 | void machine_halt(void) | |
86 | { | |
87 | #if defined(CONFIG_SH_HS7751RVOIP) | |
88 | unsigned short value; | |
89 | ||
90 | value = ctrl_inw(PA_OUTPORTR); | |
91 | ctrl_outw((value & 0xffdf), PA_OUTPORTR); | |
92 | #elif defined(CONFIG_SH_RTS7751R2D) | |
93 | ctrl_outw(0x0001, PA_POWOFF); | |
94 | #endif | |
95 | while (1) | |
96 | cpu_sleep(); | |
97 | } | |
98 | ||
99 | EXPORT_SYMBOL(machine_halt); | |
100 | ||
101 | void machine_power_off(void) | |
102 | { | |
103 | #if defined(CONFIG_SH_HS7751RVOIP) | |
104 | unsigned short value; | |
105 | ||
106 | value = ctrl_inw(PA_OUTPORTR); | |
107 | ctrl_outw((value & 0xffdf), PA_OUTPORTR); | |
108 | #elif defined(CONFIG_SH_RTS7751R2D) | |
109 | ctrl_outw(0x0001, PA_POWOFF); | |
110 | #endif | |
111 | } | |
112 | ||
113 | EXPORT_SYMBOL(machine_power_off); | |
114 | ||
115 | void show_regs(struct pt_regs * regs) | |
116 | { | |
117 | printk("\n"); | |
118 | printk("Pid : %d, Comm: %20s\n", current->pid, current->comm); | |
119 | print_symbol("PC is at %s\n", regs->pc); | |
120 | printk("PC : %08lx SP : %08lx SR : %08lx ", | |
121 | regs->pc, regs->regs[15], regs->sr); | |
122 | #ifdef CONFIG_MMU | |
123 | printk("TEA : %08x ", ctrl_inl(MMU_TEA)); | |
124 | #else | |
125 | printk(" "); | |
126 | #endif | |
127 | printk("%s\n", print_tainted()); | |
128 | ||
129 | printk("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n", | |
130 | regs->regs[0],regs->regs[1], | |
131 | regs->regs[2],regs->regs[3]); | |
132 | printk("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n", | |
133 | regs->regs[4],regs->regs[5], | |
134 | regs->regs[6],regs->regs[7]); | |
135 | printk("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n", | |
136 | regs->regs[8],regs->regs[9], | |
137 | regs->regs[10],regs->regs[11]); | |
138 | printk("R12 : %08lx R13 : %08lx R14 : %08lx\n", | |
139 | regs->regs[12],regs->regs[13], | |
140 | regs->regs[14]); | |
141 | printk("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n", | |
142 | regs->mach, regs->macl, regs->gbr, regs->pr); | |
143 | ||
144 | /* | |
145 | * If we're in kernel mode, dump the stack too.. | |
146 | */ | |
147 | if (!user_mode(regs)) { | |
148 | extern void show_task(unsigned long *sp); | |
149 | unsigned long sp = regs->regs[15]; | |
150 | ||
151 | show_task((unsigned long *)sp); | |
152 | } | |
153 | } | |
154 | ||
155 | /* | |
156 | * Create a kernel thread | |
157 | */ | |
158 | ||
159 | /* | |
160 | * This is the mechanism for creating a new kernel thread. | |
161 | * | |
162 | */ | |
163 | extern void kernel_thread_helper(void); | |
164 | __asm__(".align 5\n" | |
165 | "kernel_thread_helper:\n\t" | |
166 | "jsr @r5\n\t" | |
167 | " nop\n\t" | |
168 | "mov.l 1f, r1\n\t" | |
169 | "jsr @r1\n\t" | |
170 | " mov r0, r4\n\t" | |
171 | ".align 2\n\t" | |
172 | "1:.long do_exit"); | |
173 | ||
174 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
175 | { /* Don't use this in BL=1(cli). Or else, CPU resets! */ | |
176 | struct pt_regs regs; | |
177 | ||
178 | memset(®s, 0, sizeof(regs)); | |
179 | regs.regs[4] = (unsigned long) arg; | |
180 | regs.regs[5] = (unsigned long) fn; | |
181 | ||
182 | regs.pc = (unsigned long) kernel_thread_helper; | |
183 | regs.sr = (1 << 30); | |
184 | ||
185 | /* Ok, create the new process.. */ | |
186 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, NULL); | |
187 | } | |
188 | ||
189 | /* | |
190 | * Free current thread data structures etc.. | |
191 | */ | |
192 | void exit_thread(void) | |
193 | { | |
194 | if (current->thread.ubc_pc) { | |
195 | current->thread.ubc_pc = 0; | |
196 | ubc_usercnt -= 1; | |
197 | } | |
198 | } | |
199 | ||
200 | void flush_thread(void) | |
201 | { | |
202 | #if defined(CONFIG_SH_FPU) | |
203 | struct task_struct *tsk = current; | |
204 | struct pt_regs *regs = (struct pt_regs *) | |
205 | ((unsigned long)tsk->thread_info | |
206 | + THREAD_SIZE - sizeof(struct pt_regs) | |
207 | - sizeof(unsigned long)); | |
208 | ||
209 | /* Forget lazy FPU state */ | |
210 | clear_fpu(tsk, regs); | |
211 | clear_used_math(); | |
212 | #endif | |
213 | } | |
214 | ||
215 | void release_thread(struct task_struct *dead_task) | |
216 | { | |
217 | /* do nothing */ | |
218 | } | |
219 | ||
220 | /* Fill in the fpu structure for a core dump.. */ | |
221 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
222 | { | |
223 | int fpvalid = 0; | |
224 | ||
225 | #if defined(CONFIG_SH_FPU) | |
226 | struct task_struct *tsk = current; | |
227 | ||
228 | fpvalid = !!tsk_used_math(tsk); | |
229 | if (fpvalid) { | |
230 | unlazy_fpu(tsk, regs); | |
231 | memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu)); | |
232 | } | |
233 | #endif | |
234 | ||
235 | return fpvalid; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Capture the user space registers if the task is not running (in user space) | |
240 | */ | |
241 | int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs) | |
242 | { | |
243 | struct pt_regs ptregs; | |
244 | ||
245 | ptregs = *(struct pt_regs *) | |
246 | ((unsigned long)tsk->thread_info + THREAD_SIZE | |
247 | - sizeof(struct pt_regs) | |
248 | #ifdef CONFIG_SH_DSP | |
249 | - sizeof(struct pt_dspregs) | |
250 | #endif | |
251 | - sizeof(unsigned long)); | |
252 | elf_core_copy_regs(regs, &ptregs); | |
253 | ||
254 | return 1; | |
255 | } | |
256 | ||
257 | int | |
258 | dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *fpu) | |
259 | { | |
260 | int fpvalid = 0; | |
261 | ||
262 | #if defined(CONFIG_SH_FPU) | |
263 | fpvalid = !!tsk_used_math(tsk); | |
264 | if (fpvalid) { | |
265 | struct pt_regs *regs = (struct pt_regs *) | |
266 | ((unsigned long)tsk->thread_info | |
267 | + THREAD_SIZE - sizeof(struct pt_regs) | |
268 | - sizeof(unsigned long)); | |
269 | unlazy_fpu(tsk, regs); | |
270 | memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu)); | |
271 | } | |
272 | #endif | |
273 | ||
274 | return fpvalid; | |
275 | } | |
276 | ||
277 | asmlinkage void ret_from_fork(void); | |
278 | ||
279 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, | |
280 | unsigned long unused, | |
281 | struct task_struct *p, struct pt_regs *regs) | |
282 | { | |
283 | struct pt_regs *childregs; | |
284 | #if defined(CONFIG_SH_FPU) | |
285 | struct task_struct *tsk = current; | |
286 | ||
287 | unlazy_fpu(tsk, regs); | |
288 | p->thread.fpu = tsk->thread.fpu; | |
289 | copy_to_stopped_child_used_math(p); | |
290 | #endif | |
291 | ||
292 | childregs = ((struct pt_regs *) | |
293 | (THREAD_SIZE + (unsigned long) p->thread_info) | |
294 | #ifdef CONFIG_SH_DSP | |
295 | - sizeof(struct pt_dspregs) | |
296 | #endif | |
297 | - sizeof(unsigned long)) - 1; | |
298 | *childregs = *regs; | |
299 | ||
300 | if (user_mode(regs)) { | |
301 | childregs->regs[15] = usp; | |
302 | } else { | |
303 | childregs->regs[15] = (unsigned long)p->thread_info + THREAD_SIZE; | |
304 | } | |
305 | if (clone_flags & CLONE_SETTLS) { | |
306 | childregs->gbr = childregs->regs[0]; | |
307 | } | |
308 | childregs->regs[0] = 0; /* Set return value for child */ | |
309 | ||
310 | p->thread.sp = (unsigned long) childregs; | |
311 | p->thread.pc = (unsigned long) ret_from_fork; | |
312 | ||
313 | p->thread.ubc_pc = 0; | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
318 | /* | |
319 | * fill in the user structure for a core dump.. | |
320 | */ | |
321 | void dump_thread(struct pt_regs * regs, struct user * dump) | |
322 | { | |
323 | dump->magic = CMAGIC; | |
324 | dump->start_code = current->mm->start_code; | |
325 | dump->start_data = current->mm->start_data; | |
326 | dump->start_stack = regs->regs[15] & ~(PAGE_SIZE - 1); | |
327 | dump->u_tsize = (current->mm->end_code - dump->start_code) >> PAGE_SHIFT; | |
328 | dump->u_dsize = (current->mm->brk + (PAGE_SIZE-1) - dump->start_data) >> PAGE_SHIFT; | |
329 | dump->u_ssize = (current->mm->start_stack - dump->start_stack + | |
330 | PAGE_SIZE - 1) >> PAGE_SHIFT; | |
331 | /* Debug registers will come here. */ | |
332 | ||
333 | dump->regs = *regs; | |
334 | ||
335 | dump->u_fpvalid = dump_fpu(regs, &dump->fpu); | |
336 | } | |
337 | ||
338 | /* Tracing by user break controller. */ | |
339 | static void | |
340 | ubc_set_tracing(int asid, unsigned long pc) | |
341 | { | |
342 | ctrl_outl(pc, UBC_BARA); | |
343 | ||
344 | /* We don't have any ASID settings for the SH-2! */ | |
345 | if (cpu_data->type != CPU_SH7604) | |
346 | ctrl_outb(asid, UBC_BASRA); | |
347 | ||
348 | ctrl_outl(0, UBC_BAMRA); | |
349 | ||
350 | if (cpu_data->type == CPU_SH7729) { | |
351 | ctrl_outw(BBR_INST | BBR_READ | BBR_CPU, UBC_BBRA); | |
352 | ctrl_outl(BRCR_PCBA | BRCR_PCTE, UBC_BRCR); | |
353 | } else { | |
354 | ctrl_outw(BBR_INST | BBR_READ, UBC_BBRA); | |
355 | ctrl_outw(BRCR_PCBA, UBC_BRCR); | |
356 | } | |
357 | } | |
358 | ||
359 | /* | |
360 | * switch_to(x,y) should switch tasks from x to y. | |
361 | * | |
362 | */ | |
363 | struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *next) | |
364 | { | |
365 | #if defined(CONFIG_SH_FPU) | |
366 | struct pt_regs *regs = (struct pt_regs *) | |
367 | ((unsigned long)prev->thread_info | |
368 | + THREAD_SIZE - sizeof(struct pt_regs) | |
369 | - sizeof(unsigned long)); | |
370 | unlazy_fpu(prev, regs); | |
371 | #endif | |
372 | ||
373 | #ifdef CONFIG_PREEMPT | |
374 | { | |
375 | unsigned long flags; | |
376 | struct pt_regs *regs; | |
377 | ||
378 | local_irq_save(flags); | |
379 | regs = (struct pt_regs *) | |
380 | ((unsigned long)prev->thread_info | |
381 | + THREAD_SIZE - sizeof(struct pt_regs) | |
382 | #ifdef CONFIG_SH_DSP | |
383 | - sizeof(struct pt_dspregs) | |
384 | #endif | |
385 | - sizeof(unsigned long)); | |
386 | if (user_mode(regs) && regs->regs[15] >= 0xc0000000) { | |
387 | int offset = (int)regs->regs[15]; | |
388 | ||
389 | /* Reset stack pointer: clear critical region mark */ | |
390 | regs->regs[15] = regs->regs[1]; | |
391 | if (regs->pc < regs->regs[0]) | |
392 | /* Go to rewind point */ | |
393 | regs->pc = regs->regs[0] + offset; | |
394 | } | |
395 | local_irq_restore(flags); | |
396 | } | |
397 | #endif | |
398 | ||
399 | /* | |
400 | * Restore the kernel mode register | |
401 | * k7 (r7_bank1) | |
402 | */ | |
403 | asm volatile("ldc %0, r7_bank" | |
404 | : /* no output */ | |
405 | : "r" (next->thread_info)); | |
406 | ||
407 | #ifdef CONFIG_MMU | |
408 | /* If no tasks are using the UBC, we're done */ | |
409 | if (ubc_usercnt == 0) | |
410 | /* If no tasks are using the UBC, we're done */; | |
411 | else if (next->thread.ubc_pc && next->mm) { | |
412 | ubc_set_tracing(next->mm->context & MMU_CONTEXT_ASID_MASK, | |
413 | next->thread.ubc_pc); | |
414 | } else { | |
415 | ctrl_outw(0, UBC_BBRA); | |
416 | ctrl_outw(0, UBC_BBRB); | |
417 | } | |
418 | #endif | |
419 | ||
420 | return prev; | |
421 | } | |
422 | ||
423 | asmlinkage int sys_fork(unsigned long r4, unsigned long r5, | |
424 | unsigned long r6, unsigned long r7, | |
425 | struct pt_regs regs) | |
426 | { | |
427 | #ifdef CONFIG_MMU | |
428 | return do_fork(SIGCHLD, regs.regs[15], ®s, 0, NULL, NULL); | |
429 | #else | |
430 | /* fork almost works, enough to trick you into looking elsewhere :-( */ | |
431 | return -EINVAL; | |
432 | #endif | |
433 | } | |
434 | ||
435 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
436 | unsigned long parent_tidptr, | |
437 | unsigned long child_tidptr, | |
438 | struct pt_regs regs) | |
439 | { | |
440 | if (!newsp) | |
441 | newsp = regs.regs[15]; | |
442 | return do_fork(clone_flags, newsp, ®s, 0, | |
443 | (int __user *)parent_tidptr, (int __user *)child_tidptr); | |
444 | } | |
445 | ||
446 | /* | |
447 | * This is trivial, and on the face of it looks like it | |
448 | * could equally well be done in user mode. | |
449 | * | |
450 | * Not so, for quite unobvious reasons - register pressure. | |
451 | * In user mode vfork() cannot have a stack frame, and if | |
452 | * done by calling the "clone()" system call directly, you | |
453 | * do not have enough call-clobbered registers to hold all | |
454 | * the information you need. | |
455 | */ | |
456 | asmlinkage int sys_vfork(unsigned long r4, unsigned long r5, | |
457 | unsigned long r6, unsigned long r7, | |
458 | struct pt_regs regs) | |
459 | { | |
460 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.regs[15], ®s, | |
461 | 0, NULL, NULL); | |
462 | } | |
463 | ||
464 | /* | |
465 | * sys_execve() executes a new program. | |
466 | */ | |
467 | asmlinkage int sys_execve(char *ufilename, char **uargv, | |
468 | char **uenvp, unsigned long r7, | |
469 | struct pt_regs regs) | |
470 | { | |
471 | int error; | |
472 | char *filename; | |
473 | ||
474 | filename = getname((char __user *)ufilename); | |
475 | error = PTR_ERR(filename); | |
476 | if (IS_ERR(filename)) | |
477 | goto out; | |
478 | ||
479 | error = do_execve(filename, | |
480 | (char __user * __user *)uargv, | |
481 | (char __user * __user *)uenvp, | |
482 | ®s); | |
483 | if (error == 0) { | |
484 | task_lock(current); | |
485 | current->ptrace &= ~PT_DTRACE; | |
486 | task_unlock(current); | |
487 | } | |
488 | putname(filename); | |
489 | out: | |
490 | return error; | |
491 | } | |
492 | ||
493 | unsigned long get_wchan(struct task_struct *p) | |
494 | { | |
495 | unsigned long schedule_frame; | |
496 | unsigned long pc; | |
497 | ||
498 | if (!p || p == current || p->state == TASK_RUNNING) | |
499 | return 0; | |
500 | ||
501 | /* | |
502 | * The same comment as on the Alpha applies here, too ... | |
503 | */ | |
504 | pc = thread_saved_pc(p); | |
505 | if (in_sched_functions(pc)) { | |
506 | schedule_frame = ((unsigned long *)(long)p->thread.sp)[1]; | |
507 | return (unsigned long)((unsigned long *)schedule_frame)[1]; | |
508 | } | |
509 | return pc; | |
510 | } | |
511 | ||
512 | asmlinkage void break_point_trap(unsigned long r4, unsigned long r5, | |
513 | unsigned long r6, unsigned long r7, | |
514 | struct pt_regs regs) | |
515 | { | |
516 | /* Clear tracing. */ | |
517 | ctrl_outw(0, UBC_BBRA); | |
518 | ctrl_outw(0, UBC_BBRB); | |
519 | current->thread.ubc_pc = 0; | |
520 | ubc_usercnt -= 1; | |
521 | ||
522 | force_sig(SIGTRAP, current); | |
523 | } | |
524 | ||
525 | asmlinkage void break_point_trap_software(unsigned long r4, unsigned long r5, | |
526 | unsigned long r6, unsigned long r7, | |
527 | struct pt_regs regs) | |
528 | { | |
529 | regs.pc -= 2; | |
530 | force_sig(SIGTRAP, current); | |
531 | } |