Commit | Line | Data |
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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 | |
8ae91b9a | 8 | * Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC |
1da177e4 LT |
9 | */ |
10 | ||
11 | /* | |
12 | * This file handles the architecture-dependent parts of process handling.. | |
13 | */ | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/unistd.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/elfcore.h> | |
1da177e4 | 19 | #include <linux/a.out.h> |
a3310bbd PM |
20 | #include <linux/slab.h> |
21 | #include <linux/pm.h> | |
1da177e4 | 22 | #include <linux/ptrace.h> |
1da177e4 | 23 | #include <linux/kallsyms.h> |
a3310bbd | 24 | #include <linux/kexec.h> |
1da177e4 LT |
25 | |
26 | #include <asm/io.h> | |
27 | #include <asm/uaccess.h> | |
28 | #include <asm/mmu_context.h> | |
29 | #include <asm/elf.h> | |
b5233d07 | 30 | #include <asm/ubc.h> |
1da177e4 LT |
31 | |
32 | static int hlt_counter=0; | |
33 | ||
34 | int ubc_usercnt = 0; | |
35 | ||
36 | #define HARD_IDLE_TIMEOUT (HZ / 3) | |
37 | ||
a3310bbd PM |
38 | void (*pm_idle)(void); |
39 | ||
40 | void (*pm_power_off)(void); | |
41 | EXPORT_SYMBOL(pm_power_off); | |
42 | ||
1da177e4 LT |
43 | void disable_hlt(void) |
44 | { | |
45 | hlt_counter++; | |
46 | } | |
47 | ||
48 | EXPORT_SYMBOL(disable_hlt); | |
49 | ||
50 | void enable_hlt(void) | |
51 | { | |
52 | hlt_counter--; | |
53 | } | |
54 | ||
55 | EXPORT_SYMBOL(enable_hlt); | |
56 | ||
a3310bbd PM |
57 | void default_idle(void) |
58 | { | |
59 | if (!hlt_counter) | |
60 | cpu_sleep(); | |
61 | else | |
62 | cpu_relax(); | |
63 | } | |
64 | ||
64c7c8f8 | 65 | void cpu_idle(void) |
1da177e4 LT |
66 | { |
67 | /* endless idle loop with no priority at all */ | |
68 | while (1) { | |
a3310bbd PM |
69 | void (*idle)(void) = pm_idle; |
70 | ||
71 | if (!idle) | |
72 | idle = default_idle; | |
73 | ||
74 | while (!need_resched()) | |
75 | idle(); | |
1da177e4 | 76 | |
5bfb5d69 | 77 | preempt_enable_no_resched(); |
1da177e4 | 78 | schedule(); |
5bfb5d69 | 79 | preempt_disable(); |
1da177e4 LT |
80 | } |
81 | } | |
82 | ||
1da177e4 LT |
83 | void machine_restart(char * __unused) |
84 | { | |
85 | /* SR.BL=1 and invoke address error to let CPU reset (manual reset) */ | |
86 | asm volatile("ldc %0, sr\n\t" | |
87 | "mov.l @%1, %0" : : "r" (0x10000000), "r" (0x80000001)); | |
88 | } | |
89 | ||
1da177e4 LT |
90 | void machine_halt(void) |
91 | { | |
a3310bbd | 92 | local_irq_disable(); |
1da177e4 | 93 | |
1da177e4 LT |
94 | while (1) |
95 | cpu_sleep(); | |
96 | } | |
97 | ||
1da177e4 LT |
98 | void machine_power_off(void) |
99 | { | |
a3310bbd PM |
100 | if (pm_power_off) |
101 | pm_power_off(); | |
1da177e4 LT |
102 | } |
103 | ||
1da177e4 LT |
104 | void show_regs(struct pt_regs * regs) |
105 | { | |
106 | printk("\n"); | |
107 | printk("Pid : %d, Comm: %20s\n", current->pid, current->comm); | |
6b002230 | 108 | print_symbol("PC is at %s\n", instruction_pointer(regs)); |
1da177e4 LT |
109 | printk("PC : %08lx SP : %08lx SR : %08lx ", |
110 | regs->pc, regs->regs[15], regs->sr); | |
111 | #ifdef CONFIG_MMU | |
112 | printk("TEA : %08x ", ctrl_inl(MMU_TEA)); | |
113 | #else | |
114 | printk(" "); | |
115 | #endif | |
116 | printk("%s\n", print_tainted()); | |
117 | ||
118 | printk("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n", | |
119 | regs->regs[0],regs->regs[1], | |
120 | regs->regs[2],regs->regs[3]); | |
121 | printk("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n", | |
122 | regs->regs[4],regs->regs[5], | |
123 | regs->regs[6],regs->regs[7]); | |
124 | printk("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n", | |
125 | regs->regs[8],regs->regs[9], | |
126 | regs->regs[10],regs->regs[11]); | |
127 | printk("R12 : %08lx R13 : %08lx R14 : %08lx\n", | |
128 | regs->regs[12],regs->regs[13], | |
129 | regs->regs[14]); | |
130 | printk("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n", | |
131 | regs->mach, regs->macl, regs->gbr, regs->pr); | |
132 | ||
6b002230 | 133 | show_trace(NULL, (unsigned long *)regs->regs[15], regs); |
1da177e4 LT |
134 | } |
135 | ||
136 | /* | |
137 | * Create a kernel thread | |
138 | */ | |
139 | ||
140 | /* | |
141 | * This is the mechanism for creating a new kernel thread. | |
142 | * | |
143 | */ | |
144 | extern void kernel_thread_helper(void); | |
145 | __asm__(".align 5\n" | |
146 | "kernel_thread_helper:\n\t" | |
147 | "jsr @r5\n\t" | |
148 | " nop\n\t" | |
149 | "mov.l 1f, r1\n\t" | |
150 | "jsr @r1\n\t" | |
151 | " mov r0, r4\n\t" | |
152 | ".align 2\n\t" | |
153 | "1:.long do_exit"); | |
154 | ||
155 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
156 | { /* Don't use this in BL=1(cli). Or else, CPU resets! */ | |
157 | struct pt_regs regs; | |
158 | ||
159 | memset(®s, 0, sizeof(regs)); | |
160 | regs.regs[4] = (unsigned long) arg; | |
161 | regs.regs[5] = (unsigned long) fn; | |
162 | ||
163 | regs.pc = (unsigned long) kernel_thread_helper; | |
164 | regs.sr = (1 << 30); | |
165 | ||
166 | /* Ok, create the new process.. */ | |
167 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, NULL); | |
168 | } | |
169 | ||
170 | /* | |
171 | * Free current thread data structures etc.. | |
172 | */ | |
173 | void exit_thread(void) | |
174 | { | |
175 | if (current->thread.ubc_pc) { | |
176 | current->thread.ubc_pc = 0; | |
177 | ubc_usercnt -= 1; | |
178 | } | |
179 | } | |
180 | ||
181 | void flush_thread(void) | |
182 | { | |
183 | #if defined(CONFIG_SH_FPU) | |
184 | struct task_struct *tsk = current; | |
1da177e4 | 185 | /* Forget lazy FPU state */ |
3cf0f4ec | 186 | clear_fpu(tsk, task_pt_regs(tsk)); |
1da177e4 LT |
187 | clear_used_math(); |
188 | #endif | |
189 | } | |
190 | ||
191 | void release_thread(struct task_struct *dead_task) | |
192 | { | |
193 | /* do nothing */ | |
194 | } | |
195 | ||
196 | /* Fill in the fpu structure for a core dump.. */ | |
197 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
198 | { | |
199 | int fpvalid = 0; | |
200 | ||
201 | #if defined(CONFIG_SH_FPU) | |
202 | struct task_struct *tsk = current; | |
203 | ||
204 | fpvalid = !!tsk_used_math(tsk); | |
205 | if (fpvalid) { | |
206 | unlazy_fpu(tsk, regs); | |
207 | memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu)); | |
208 | } | |
209 | #endif | |
210 | ||
211 | return fpvalid; | |
212 | } | |
213 | ||
214 | /* | |
215 | * Capture the user space registers if the task is not running (in user space) | |
216 | */ | |
217 | int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs) | |
218 | { | |
219 | struct pt_regs ptregs; | |
220 | ||
3cf0f4ec | 221 | ptregs = *task_pt_regs(tsk); |
1da177e4 LT |
222 | elf_core_copy_regs(regs, &ptregs); |
223 | ||
224 | return 1; | |
225 | } | |
226 | ||
227 | int | |
228 | dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *fpu) | |
229 | { | |
230 | int fpvalid = 0; | |
231 | ||
232 | #if defined(CONFIG_SH_FPU) | |
233 | fpvalid = !!tsk_used_math(tsk); | |
234 | if (fpvalid) { | |
3cf0f4ec | 235 | unlazy_fpu(tsk, task_pt_regs(tsk)); |
1da177e4 LT |
236 | memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu)); |
237 | } | |
238 | #endif | |
239 | ||
240 | return fpvalid; | |
241 | } | |
242 | ||
243 | asmlinkage void ret_from_fork(void); | |
244 | ||
245 | int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, | |
246 | unsigned long unused, | |
247 | struct task_struct *p, struct pt_regs *regs) | |
248 | { | |
2991be72 | 249 | struct thread_info *ti = task_thread_info(p); |
1da177e4 LT |
250 | struct pt_regs *childregs; |
251 | #if defined(CONFIG_SH_FPU) | |
252 | struct task_struct *tsk = current; | |
253 | ||
254 | unlazy_fpu(tsk, regs); | |
255 | p->thread.fpu = tsk->thread.fpu; | |
256 | copy_to_stopped_child_used_math(p); | |
257 | #endif | |
258 | ||
3cf0f4ec | 259 | childregs = task_pt_regs(p); |
1da177e4 LT |
260 | *childregs = *regs; |
261 | ||
262 | if (user_mode(regs)) { | |
263 | childregs->regs[15] = usp; | |
2991be72 | 264 | ti->addr_limit = USER_DS; |
1da177e4 | 265 | } else { |
308a792f | 266 | childregs->regs[15] = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
2991be72 | 267 | ti->addr_limit = KERNEL_DS; |
1da177e4 LT |
268 | } |
269 | if (clone_flags & CLONE_SETTLS) { | |
270 | childregs->gbr = childregs->regs[0]; | |
271 | } | |
272 | childregs->regs[0] = 0; /* Set return value for child */ | |
273 | ||
274 | p->thread.sp = (unsigned long) childregs; | |
275 | p->thread.pc = (unsigned long) ret_from_fork; | |
276 | ||
277 | p->thread.ubc_pc = 0; | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
1da177e4 LT |
282 | /* Tracing by user break controller. */ |
283 | static void | |
284 | ubc_set_tracing(int asid, unsigned long pc) | |
285 | { | |
8ae91b9a RS |
286 | #if defined(CONFIG_CPU_SH4A) |
287 | unsigned long val; | |
288 | ||
289 | val = (UBC_CBR_ID_INST | UBC_CBR_RW_READ | UBC_CBR_CE); | |
290 | val |= (UBC_CBR_AIE | UBC_CBR_AIV_SET(asid)); | |
291 | ||
292 | ctrl_outl(val, UBC_CBR0); | |
293 | ctrl_outl(pc, UBC_CAR0); | |
294 | ctrl_outl(0x0, UBC_CAMR0); | |
295 | ctrl_outl(0x0, UBC_CBCR); | |
296 | ||
297 | val = (UBC_CRR_RES | UBC_CRR_PCB | UBC_CRR_BIE); | |
298 | ctrl_outl(val, UBC_CRR0); | |
299 | ||
300 | /* Read UBC register that we writed last. For chekking UBC Register changed */ | |
301 | val = ctrl_inl(UBC_CRR0); | |
302 | ||
303 | #else /* CONFIG_CPU_SH4A */ | |
1da177e4 LT |
304 | ctrl_outl(pc, UBC_BARA); |
305 | ||
a2d1a5fa | 306 | #ifdef CONFIG_MMU |
1da177e4 LT |
307 | /* We don't have any ASID settings for the SH-2! */ |
308 | if (cpu_data->type != CPU_SH7604) | |
309 | ctrl_outb(asid, UBC_BASRA); | |
a2d1a5fa | 310 | #endif |
1da177e4 LT |
311 | |
312 | ctrl_outl(0, UBC_BAMRA); | |
313 | ||
e5723e0e | 314 | if (cpu_data->type == CPU_SH7729 || cpu_data->type == CPU_SH7710) { |
1da177e4 LT |
315 | ctrl_outw(BBR_INST | BBR_READ | BBR_CPU, UBC_BBRA); |
316 | ctrl_outl(BRCR_PCBA | BRCR_PCTE, UBC_BRCR); | |
317 | } else { | |
318 | ctrl_outw(BBR_INST | BBR_READ, UBC_BBRA); | |
319 | ctrl_outw(BRCR_PCBA, UBC_BRCR); | |
320 | } | |
8ae91b9a | 321 | #endif /* CONFIG_CPU_SH4A */ |
1da177e4 LT |
322 | } |
323 | ||
324 | /* | |
325 | * switch_to(x,y) should switch tasks from x to y. | |
326 | * | |
327 | */ | |
328 | struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *next) | |
329 | { | |
330 | #if defined(CONFIG_SH_FPU) | |
3cf0f4ec | 331 | unlazy_fpu(prev, task_pt_regs(prev)); |
1da177e4 LT |
332 | #endif |
333 | ||
334 | #ifdef CONFIG_PREEMPT | |
335 | { | |
336 | unsigned long flags; | |
337 | struct pt_regs *regs; | |
338 | ||
339 | local_irq_save(flags); | |
3cf0f4ec | 340 | regs = task_pt_regs(prev); |
1da177e4 LT |
341 | if (user_mode(regs) && regs->regs[15] >= 0xc0000000) { |
342 | int offset = (int)regs->regs[15]; | |
343 | ||
344 | /* Reset stack pointer: clear critical region mark */ | |
345 | regs->regs[15] = regs->regs[1]; | |
346 | if (regs->pc < regs->regs[0]) | |
347 | /* Go to rewind point */ | |
348 | regs->pc = regs->regs[0] + offset; | |
349 | } | |
350 | local_irq_restore(flags); | |
351 | } | |
352 | #endif | |
353 | ||
a2d1a5fa | 354 | #ifdef CONFIG_MMU |
1da177e4 LT |
355 | /* |
356 | * Restore the kernel mode register | |
357 | * k7 (r7_bank1) | |
358 | */ | |
359 | asm volatile("ldc %0, r7_bank" | |
360 | : /* no output */ | |
cafcfcaa | 361 | : "r" (task_thread_info(next))); |
a2d1a5fa | 362 | #endif |
1da177e4 | 363 | |
1da177e4 LT |
364 | /* If no tasks are using the UBC, we're done */ |
365 | if (ubc_usercnt == 0) | |
366 | /* If no tasks are using the UBC, we're done */; | |
367 | else if (next->thread.ubc_pc && next->mm) { | |
a2d1a5fa YS |
368 | int asid = 0; |
369 | #ifdef CONFIG_MMU | |
19f9a34f | 370 | asid |= next->mm->context.id & MMU_CONTEXT_ASID_MASK; |
a2d1a5fa YS |
371 | #endif |
372 | ubc_set_tracing(asid, next->thread.ubc_pc); | |
1da177e4 | 373 | } else { |
8ae91b9a RS |
374 | #if defined(CONFIG_CPU_SH4A) |
375 | ctrl_outl(UBC_CBR_INIT, UBC_CBR0); | |
376 | ctrl_outl(UBC_CRR_INIT, UBC_CRR0); | |
377 | #else | |
1da177e4 LT |
378 | ctrl_outw(0, UBC_BBRA); |
379 | ctrl_outw(0, UBC_BBRB); | |
8ae91b9a | 380 | #endif |
1da177e4 | 381 | } |
1da177e4 LT |
382 | |
383 | return prev; | |
384 | } | |
385 | ||
386 | asmlinkage int sys_fork(unsigned long r4, unsigned long r5, | |
387 | unsigned long r6, unsigned long r7, | |
f0bc814c | 388 | struct pt_regs __regs) |
1da177e4 | 389 | { |
f0bc814c | 390 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 | 391 | #ifdef CONFIG_MMU |
f0bc814c | 392 | return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL); |
1da177e4 LT |
393 | #else |
394 | /* fork almost works, enough to trick you into looking elsewhere :-( */ | |
395 | return -EINVAL; | |
396 | #endif | |
397 | } | |
398 | ||
399 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
400 | unsigned long parent_tidptr, | |
401 | unsigned long child_tidptr, | |
f0bc814c | 402 | struct pt_regs __regs) |
1da177e4 | 403 | { |
f0bc814c | 404 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 | 405 | if (!newsp) |
f0bc814c SM |
406 | newsp = regs->regs[15]; |
407 | return do_fork(clone_flags, newsp, regs, 0, | |
1da177e4 LT |
408 | (int __user *)parent_tidptr, (int __user *)child_tidptr); |
409 | } | |
410 | ||
411 | /* | |
412 | * This is trivial, and on the face of it looks like it | |
413 | * could equally well be done in user mode. | |
414 | * | |
415 | * Not so, for quite unobvious reasons - register pressure. | |
416 | * In user mode vfork() cannot have a stack frame, and if | |
417 | * done by calling the "clone()" system call directly, you | |
418 | * do not have enough call-clobbered registers to hold all | |
419 | * the information you need. | |
420 | */ | |
421 | asmlinkage int sys_vfork(unsigned long r4, unsigned long r5, | |
422 | unsigned long r6, unsigned long r7, | |
f0bc814c | 423 | struct pt_regs __regs) |
1da177e4 | 424 | { |
f0bc814c SM |
425 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
426 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->regs[15], regs, | |
1da177e4 LT |
427 | 0, NULL, NULL); |
428 | } | |
429 | ||
430 | /* | |
431 | * sys_execve() executes a new program. | |
432 | */ | |
433 | asmlinkage int sys_execve(char *ufilename, char **uargv, | |
434 | char **uenvp, unsigned long r7, | |
f0bc814c | 435 | struct pt_regs __regs) |
1da177e4 | 436 | { |
f0bc814c | 437 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
1da177e4 LT |
438 | int error; |
439 | char *filename; | |
440 | ||
441 | filename = getname((char __user *)ufilename); | |
442 | error = PTR_ERR(filename); | |
443 | if (IS_ERR(filename)) | |
444 | goto out; | |
445 | ||
446 | error = do_execve(filename, | |
447 | (char __user * __user *)uargv, | |
448 | (char __user * __user *)uenvp, | |
f0bc814c | 449 | regs); |
1da177e4 LT |
450 | if (error == 0) { |
451 | task_lock(current); | |
452 | current->ptrace &= ~PT_DTRACE; | |
453 | task_unlock(current); | |
454 | } | |
455 | putname(filename); | |
456 | out: | |
457 | return error; | |
458 | } | |
459 | ||
460 | unsigned long get_wchan(struct task_struct *p) | |
461 | { | |
462 | unsigned long schedule_frame; | |
463 | unsigned long pc; | |
464 | ||
465 | if (!p || p == current || p->state == TASK_RUNNING) | |
466 | return 0; | |
467 | ||
468 | /* | |
469 | * The same comment as on the Alpha applies here, too ... | |
470 | */ | |
471 | pc = thread_saved_pc(p); | |
472 | if (in_sched_functions(pc)) { | |
b652c23c PM |
473 | schedule_frame = (unsigned long)p->thread.sp; |
474 | return ((unsigned long *)schedule_frame)[21]; | |
1da177e4 | 475 | } |
b652c23c | 476 | |
1da177e4 LT |
477 | return pc; |
478 | } | |
479 | ||
f0bc814c | 480 | asmlinkage void break_point_trap(void) |
1da177e4 LT |
481 | { |
482 | /* Clear tracing. */ | |
8ae91b9a RS |
483 | #if defined(CONFIG_CPU_SH4A) |
484 | ctrl_outl(UBC_CBR_INIT, UBC_CBR0); | |
485 | ctrl_outl(UBC_CRR_INIT, UBC_CRR0); | |
486 | #else | |
1da177e4 LT |
487 | ctrl_outw(0, UBC_BBRA); |
488 | ctrl_outw(0, UBC_BBRB); | |
8ae91b9a | 489 | #endif |
1da177e4 LT |
490 | current->thread.ubc_pc = 0; |
491 | ubc_usercnt -= 1; | |
492 | ||
493 | force_sig(SIGTRAP, current); | |
494 | } | |
495 | ||
496 | asmlinkage void break_point_trap_software(unsigned long r4, unsigned long r5, | |
497 | unsigned long r6, unsigned long r7, | |
f0bc814c | 498 | struct pt_regs __regs) |
1da177e4 | 499 | { |
f0bc814c SM |
500 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
501 | ||
dc34d312 | 502 | /* Rewind */ |
f0bc814c | 503 | regs->pc -= 2; |
dc34d312 PM |
504 | |
505 | #ifdef CONFIG_BUG | |
506 | if (__kernel_text_address(instruction_pointer(regs))) { | |
507 | u16 insn = *(u16 *)instruction_pointer(regs); | |
508 | if (insn == TRAPA_BUG_OPCODE) | |
509 | handle_BUG(regs); | |
510 | } | |
511 | #endif | |
512 | ||
1da177e4 LT |
513 | force_sig(SIGTRAP, current); |
514 | } |