Commit | Line | Data |
---|---|---|
64d329ee | 1 | /* linux/arch/sparc/kernel/process.c |
1da177e4 | 2 | * |
4fe3ebec | 3 | * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
4 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) |
5 | */ | |
6 | ||
7 | /* | |
8 | * This file handles the architecture-dependent parts of process handling.. | |
9 | */ | |
10 | ||
11 | #include <stdarg.h> | |
12 | ||
13 | #include <linux/errno.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/kernel.h> | |
1da177e4 LT |
17 | #include <linux/mm.h> |
18 | #include <linux/stddef.h> | |
19 | #include <linux/ptrace.h> | |
1da177e4 | 20 | #include <linux/user.h> |
1da177e4 | 21 | #include <linux/smp.h> |
1da177e4 LT |
22 | #include <linux/reboot.h> |
23 | #include <linux/delay.h> | |
24 | #include <linux/pm.h> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
1da177e4 LT |
26 | |
27 | #include <asm/auxio.h> | |
28 | #include <asm/oplib.h> | |
29 | #include <asm/uaccess.h> | |
1da177e4 LT |
30 | #include <asm/page.h> |
31 | #include <asm/pgalloc.h> | |
32 | #include <asm/pgtable.h> | |
33 | #include <asm/delay.h> | |
34 | #include <asm/processor.h> | |
35 | #include <asm/psr.h> | |
36 | #include <asm/elf.h> | |
c73fcc84 | 37 | #include <asm/prom.h> |
1da177e4 | 38 | #include <asm/unistd.h> |
d550bbd4 | 39 | #include <asm/setup.h> |
1da177e4 LT |
40 | |
41 | /* | |
42 | * Power management idle function | |
43 | * Set in pm platform drivers (apc.c and pmc.c) | |
44 | */ | |
d472ba84 | 45 | void (*sparc_idle)(void); |
1da177e4 LT |
46 | |
47 | /* | |
48 | * Power-off handler instantiation for pm.h compliance | |
49 | * This is done via auxio, but could be used as a fallback | |
50 | * handler when auxio is not present-- unused for now... | |
51 | */ | |
304cd3ef | 52 | void (*pm_power_off)(void) = machine_power_off; |
89eb1693 | 53 | EXPORT_SYMBOL(pm_power_off); |
1da177e4 LT |
54 | |
55 | /* | |
56 | * sysctl - toggle power-off restriction for serial console | |
57 | * systems in machine_power_off() | |
58 | */ | |
59 | int scons_pwroff = 1; | |
60 | ||
61 | extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *); | |
62 | ||
63 | struct task_struct *last_task_used_math = NULL; | |
64 | struct thread_info *current_set[NR_CPUS]; | |
65 | ||
87fa05ae SR |
66 | /* Idle loop support. */ |
67 | void arch_cpu_idle(void) | |
1da177e4 | 68 | { |
87fa05ae SR |
69 | if (sparc_idle) |
70 | (*sparc_idle)(); | |
71 | local_irq_enable(); | |
1da177e4 LT |
72 | } |
73 | ||
1da177e4 LT |
74 | /* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */ |
75 | void machine_halt(void) | |
76 | { | |
77 | local_irq_enable(); | |
78 | mdelay(8); | |
79 | local_irq_disable(); | |
1da177e4 LT |
80 | prom_halt(); |
81 | panic("Halt failed!"); | |
82 | } | |
83 | ||
1da177e4 LT |
84 | void machine_restart(char * cmd) |
85 | { | |
86 | char *p; | |
87 | ||
88 | local_irq_enable(); | |
89 | mdelay(8); | |
90 | local_irq_disable(); | |
91 | ||
92 | p = strchr (reboot_command, '\n'); | |
93 | if (p) *p = 0; | |
1da177e4 LT |
94 | if (cmd) |
95 | prom_reboot(cmd); | |
96 | if (*reboot_command) | |
97 | prom_reboot(reboot_command); | |
98 | prom_feval ("reset"); | |
99 | panic("Reboot failed!"); | |
100 | } | |
101 | ||
1da177e4 LT |
102 | void machine_power_off(void) |
103 | { | |
c73fcc84 DM |
104 | if (auxio_power_register && |
105 | (strcmp(of_console_device->type, "serial") || scons_pwroff)) | |
1da177e4 | 106 | *auxio_power_register |= AUXIO_POWER_OFF; |
1da177e4 LT |
107 | machine_halt(); |
108 | } | |
109 | ||
1da177e4 LT |
110 | void show_regs(struct pt_regs *r) |
111 | { | |
4d7b92ad | 112 | struct reg_window32 *rw = (struct reg_window32 *) r->u_regs[14]; |
1da177e4 | 113 | |
a43cb95d TH |
114 | show_regs_print_info(KERN_DEFAULT); |
115 | ||
1da177e4 LT |
116 | printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx %s\n", |
117 | r->psr, r->pc, r->npc, r->y, print_tainted()); | |
4fe3ebec | 118 | printk("PC: <%pS>\n", (void *) r->pc); |
1da177e4 LT |
119 | printk("%%G: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", |
120 | r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3], | |
121 | r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]); | |
122 | printk("%%O: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
123 | r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11], | |
124 | r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]); | |
4fe3ebec | 125 | printk("RPC: <%pS>\n", (void *) r->u_regs[15]); |
1da177e4 LT |
126 | |
127 | printk("%%L: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
128 | rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3], | |
129 | rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]); | |
130 | printk("%%I: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
131 | rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3], | |
132 | rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]); | |
133 | } | |
134 | ||
135 | /* | |
136 | * The show_stack is an external API which we do not use ourselves. | |
137 | * The oops is printed in die_if_kernel. | |
138 | */ | |
139 | void show_stack(struct task_struct *tsk, unsigned long *_ksp) | |
140 | { | |
141 | unsigned long pc, fp; | |
142 | unsigned long task_base; | |
4d7b92ad | 143 | struct reg_window32 *rw; |
1da177e4 LT |
144 | int count = 0; |
145 | ||
89e3f23d TH |
146 | if (!tsk) |
147 | tsk = current; | |
1da177e4 | 148 | |
89e3f23d TH |
149 | if (tsk == current && !_ksp) |
150 | __asm__ __volatile__("mov %%fp, %0" : "=r" (_ksp)); | |
151 | ||
152 | task_base = (unsigned long) task_stack_page(tsk); | |
1da177e4 LT |
153 | fp = (unsigned long) _ksp; |
154 | do { | |
155 | /* Bogus frame pointer? */ | |
156 | if (fp < (task_base + sizeof(struct thread_info)) || | |
157 | fp >= (task_base + (PAGE_SIZE << 1))) | |
158 | break; | |
4d7b92ad | 159 | rw = (struct reg_window32 *) fp; |
1da177e4 LT |
160 | pc = rw->ins[7]; |
161 | printk("[%08lx : ", pc); | |
4fe3ebec | 162 | printk("%pS ] ", (void *) pc); |
1da177e4 LT |
163 | fp = rw->ins[6]; |
164 | } while (++count < 16); | |
165 | printk("\n"); | |
166 | } | |
167 | ||
168 | /* | |
169 | * Note: sparc64 has a pretty intricated thread_saved_pc, check it out. | |
170 | */ | |
171 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
172 | { | |
d562ef6a | 173 | return task_thread_info(tsk)->kpc; |
1da177e4 LT |
174 | } |
175 | ||
176 | /* | |
177 | * Free current thread data structures etc.. | |
178 | */ | |
179 | void exit_thread(void) | |
180 | { | |
181 | #ifndef CONFIG_SMP | |
182 | if(last_task_used_math == current) { | |
183 | #else | |
54f565ea | 184 | if (test_thread_flag(TIF_USEDFPU)) { |
1da177e4 LT |
185 | #endif |
186 | /* Keep process from leaving FPU in a bogon state. */ | |
187 | put_psr(get_psr() | PSR_EF); | |
188 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
189 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
190 | #ifndef CONFIG_SMP | |
191 | last_task_used_math = NULL; | |
192 | #else | |
54f565ea | 193 | clear_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
194 | #endif |
195 | } | |
196 | } | |
197 | ||
198 | void flush_thread(void) | |
199 | { | |
200 | current_thread_info()->w_saved = 0; | |
201 | ||
1da177e4 LT |
202 | #ifndef CONFIG_SMP |
203 | if(last_task_used_math == current) { | |
204 | #else | |
54f565ea | 205 | if (test_thread_flag(TIF_USEDFPU)) { |
1da177e4 LT |
206 | #endif |
207 | /* Clean the fpu. */ | |
208 | put_psr(get_psr() | PSR_EF); | |
209 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
210 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
211 | #ifndef CONFIG_SMP | |
212 | last_task_used_math = NULL; | |
213 | #else | |
54f565ea | 214 | clear_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
215 | #endif |
216 | } | |
217 | ||
ddd53bf1 | 218 | /* This task is no longer a kernel thread. */ |
1da177e4 LT |
219 | if (current->thread.flags & SPARC_FLAG_KTHREAD) { |
220 | current->thread.flags &= ~SPARC_FLAG_KTHREAD; | |
221 | ||
222 | /* We must fixup kregs as well. */ | |
223 | /* XXX This was not fixed for ti for a while, worked. Unused? */ | |
224 | current->thread.kregs = (struct pt_regs *) | |
36483c6b | 225 | (task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ)); |
1da177e4 LT |
226 | } |
227 | } | |
228 | ||
64d329ee | 229 | static inline struct sparc_stackf __user * |
1da177e4 LT |
230 | clone_stackframe(struct sparc_stackf __user *dst, |
231 | struct sparc_stackf __user *src) | |
232 | { | |
233 | unsigned long size, fp; | |
234 | struct sparc_stackf *tmp; | |
235 | struct sparc_stackf __user *sp; | |
236 | ||
237 | if (get_user(tmp, &src->fp)) | |
238 | return NULL; | |
239 | ||
240 | fp = (unsigned long) tmp; | |
241 | size = (fp - ((unsigned long) src)); | |
242 | fp = (unsigned long) dst; | |
243 | sp = (struct sparc_stackf __user *)(fp - size); | |
244 | ||
245 | /* do_fork() grabs the parent semaphore, we must release it | |
246 | * temporarily so we can build the child clone stack frame | |
247 | * without deadlocking. | |
248 | */ | |
249 | if (__copy_user(sp, src, size)) | |
250 | sp = NULL; | |
251 | else if (put_user(fp, &sp->fp)) | |
252 | sp = NULL; | |
253 | ||
254 | return sp; | |
255 | } | |
256 | ||
257 | asmlinkage int sparc_do_fork(unsigned long clone_flags, | |
258 | unsigned long stack_start, | |
259 | struct pt_regs *regs, | |
260 | unsigned long stack_size) | |
261 | { | |
262 | unsigned long parent_tid_ptr, child_tid_ptr; | |
1e38c126 DM |
263 | unsigned long orig_i1 = regs->u_regs[UREG_I1]; |
264 | long ret; | |
1da177e4 LT |
265 | |
266 | parent_tid_ptr = regs->u_regs[UREG_I2]; | |
267 | child_tid_ptr = regs->u_regs[UREG_I4]; | |
268 | ||
e80d6661 | 269 | ret = do_fork(clone_flags, stack_start, stack_size, |
1e38c126 DM |
270 | (int __user *) parent_tid_ptr, |
271 | (int __user *) child_tid_ptr); | |
272 | ||
273 | /* If we get an error and potentially restart the system | |
274 | * call, we're screwed because copy_thread() clobbered | |
275 | * the parent's %o1. So detect that case and restore it | |
276 | * here. | |
277 | */ | |
278 | if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) | |
279 | regs->u_regs[UREG_I1] = orig_i1; | |
280 | ||
281 | return ret; | |
1da177e4 LT |
282 | } |
283 | ||
284 | /* Copy a Sparc thread. The fork() return value conventions | |
285 | * under SunOS are nothing short of bletcherous: | |
286 | * Parent --> %o0 == childs pid, %o1 == 0 | |
287 | * Child --> %o0 == parents pid, %o1 == 1 | |
288 | * | |
289 | * NOTE: We have a separate fork kpsr/kwim because | |
290 | * the parent could change these values between | |
291 | * sys_fork invocation and when we reach here | |
292 | * if the parent should sleep while trying to | |
293 | * allocate the task_struct and kernel stack in | |
294 | * do_fork(). | |
295 | * XXX See comment above sys_vfork in sparc64. todo. | |
296 | */ | |
297 | extern void ret_from_fork(void); | |
c78e0643 | 298 | extern void ret_from_kernel_thread(void); |
1da177e4 | 299 | |
6f2c55b8 | 300 | int copy_thread(unsigned long clone_flags, unsigned long sp, |
afa86fc4 | 301 | unsigned long arg, struct task_struct *p) |
1da177e4 | 302 | { |
36483c6b | 303 | struct thread_info *ti = task_thread_info(p); |
afa86fc4 | 304 | struct pt_regs *childregs, *regs = current_pt_regs(); |
1da177e4 LT |
305 | char *new_stack; |
306 | ||
307 | #ifndef CONFIG_SMP | |
308 | if(last_task_used_math == current) { | |
309 | #else | |
54f565ea | 310 | if (test_thread_flag(TIF_USEDFPU)) { |
1da177e4 LT |
311 | #endif |
312 | put_psr(get_psr() | PSR_EF); | |
313 | fpsave(&p->thread.float_regs[0], &p->thread.fsr, | |
314 | &p->thread.fpqueue[0], &p->thread.fpqdepth); | |
1da177e4 LT |
315 | } |
316 | ||
317 | /* | |
c78e0643 AV |
318 | * p->thread_info new_stack childregs stack bottom |
319 | * ! ! ! ! | |
320 | * V V (stk.fr.) V (pt_regs) V | |
321 | * +----- - - - - - ------+===========+=============+ | |
1da177e4 | 322 | */ |
36483c6b | 323 | new_stack = task_stack_page(p) + THREAD_SIZE; |
1da177e4 | 324 | new_stack -= STACKFRAME_SZ + TRACEREG_SZ; |
1da177e4 LT |
325 | childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ); |
326 | ||
327 | /* | |
328 | * A new process must start with interrupts closed in 2.5, | |
329 | * because this is how Mingo's scheduler works (see schedule_tail | |
330 | * and finish_arch_switch). If we do not do it, a timer interrupt hits | |
331 | * before we unlock, attempts to re-take the rq->lock, and then we die. | |
332 | * Thus, kpsr|=PSR_PIL. | |
333 | */ | |
334 | ti->ksp = (unsigned long) new_stack; | |
c78e0643 AV |
335 | p->thread.kregs = childregs; |
336 | ||
337 | if (unlikely(p->flags & PF_KTHREAD)) { | |
338 | extern int nwindows; | |
339 | unsigned long psr; | |
340 | memset(new_stack, 0, STACKFRAME_SZ + TRACEREG_SZ); | |
341 | p->thread.flags |= SPARC_FLAG_KTHREAD; | |
342 | p->thread.current_ds = KERNEL_DS; | |
343 | ti->kpc = (((unsigned long) ret_from_kernel_thread) - 0x8); | |
344 | childregs->u_regs[UREG_G1] = sp; /* function */ | |
345 | childregs->u_regs[UREG_G2] = arg; | |
346 | psr = childregs->psr = get_psr(); | |
347 | ti->kpsr = psr | PSR_PIL; | |
348 | ti->kwim = 1 << (((psr & PSR_CWP) + 1) % nwindows); | |
349 | return 0; | |
350 | } | |
351 | memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ); | |
352 | childregs->u_regs[UREG_FP] = sp; | |
353 | p->thread.flags &= ~SPARC_FLAG_KTHREAD; | |
354 | p->thread.current_ds = USER_DS; | |
1da177e4 LT |
355 | ti->kpc = (((unsigned long) ret_from_fork) - 0x8); |
356 | ti->kpsr = current->thread.fork_kpsr | PSR_PIL; | |
357 | ti->kwim = current->thread.fork_kwim; | |
358 | ||
c78e0643 AV |
359 | if (sp != regs->u_regs[UREG_FP]) { |
360 | struct sparc_stackf __user *childstack; | |
361 | struct sparc_stackf __user *parentstack; | |
1da177e4 | 362 | |
c78e0643 AV |
363 | /* |
364 | * This is a clone() call with supplied user stack. | |
365 | * Set some valid stack frames to give to the child. | |
366 | */ | |
367 | childstack = (struct sparc_stackf __user *) | |
368 | (sp & ~0xfUL); | |
369 | parentstack = (struct sparc_stackf __user *) | |
370 | regs->u_regs[UREG_FP]; | |
1da177e4 LT |
371 | |
372 | #if 0 | |
c78e0643 AV |
373 | printk("clone: parent stack:\n"); |
374 | show_stackframe(parentstack); | |
1da177e4 LT |
375 | #endif |
376 | ||
c78e0643 AV |
377 | childstack = clone_stackframe(childstack, parentstack); |
378 | if (!childstack) | |
379 | return -EFAULT; | |
1da177e4 LT |
380 | |
381 | #if 0 | |
c78e0643 AV |
382 | printk("clone: child stack:\n"); |
383 | show_stackframe(childstack); | |
1da177e4 LT |
384 | #endif |
385 | ||
c78e0643 | 386 | childregs->u_regs[UREG_FP] = (unsigned long)childstack; |
1da177e4 LT |
387 | } |
388 | ||
389 | #ifdef CONFIG_SMP | |
390 | /* FPU must be disabled on SMP. */ | |
391 | childregs->psr &= ~PSR_EF; | |
427f23cb | 392 | clear_tsk_thread_flag(p, TIF_USEDFPU); |
1da177e4 LT |
393 | #endif |
394 | ||
395 | /* Set the return value for the child. */ | |
396 | childregs->u_regs[UREG_I0] = current->pid; | |
397 | childregs->u_regs[UREG_I1] = 1; | |
398 | ||
399 | /* Set the return value for the parent. */ | |
400 | regs->u_regs[UREG_I1] = 0; | |
401 | ||
402 | if (clone_flags & CLONE_SETTLS) | |
403 | childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
404 | ||
405 | return 0; | |
406 | } | |
407 | ||
1da177e4 LT |
408 | /* |
409 | * fill in the fpu structure for a core dump. | |
410 | */ | |
411 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
412 | { | |
413 | if (used_math()) { | |
414 | memset(fpregs, 0, sizeof(*fpregs)); | |
415 | fpregs->pr_q_entrysize = 8; | |
416 | return 1; | |
417 | } | |
418 | #ifdef CONFIG_SMP | |
54f565ea | 419 | if (test_thread_flag(TIF_USEDFPU)) { |
1da177e4 LT |
420 | put_psr(get_psr() | PSR_EF); |
421 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
422 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
423 | if (regs != NULL) { | |
424 | regs->psr &= ~(PSR_EF); | |
54f565ea | 425 | clear_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
426 | } |
427 | } | |
428 | #else | |
429 | if (current == last_task_used_math) { | |
430 | put_psr(get_psr() | PSR_EF); | |
431 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
432 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
433 | if (regs != NULL) { | |
434 | regs->psr &= ~(PSR_EF); | |
435 | last_task_used_math = NULL; | |
436 | } | |
437 | } | |
438 | #endif | |
439 | memcpy(&fpregs->pr_fr.pr_regs[0], | |
440 | ¤t->thread.float_regs[0], | |
441 | (sizeof(unsigned long) * 32)); | |
442 | fpregs->pr_fsr = current->thread.fsr; | |
443 | fpregs->pr_qcnt = current->thread.fpqdepth; | |
444 | fpregs->pr_q_entrysize = 8; | |
445 | fpregs->pr_en = 1; | |
446 | if(fpregs->pr_qcnt != 0) { | |
447 | memcpy(&fpregs->pr_q[0], | |
448 | ¤t->thread.fpqueue[0], | |
449 | sizeof(struct fpq) * fpregs->pr_qcnt); | |
450 | } | |
451 | /* Zero out the rest. */ | |
452 | memset(&fpregs->pr_q[fpregs->pr_qcnt], 0, | |
453 | sizeof(struct fpq) * (32 - fpregs->pr_qcnt)); | |
454 | return 1; | |
455 | } | |
456 | ||
1da177e4 LT |
457 | unsigned long get_wchan(struct task_struct *task) |
458 | { | |
459 | unsigned long pc, fp, bias = 0; | |
460 | unsigned long task_base = (unsigned long) task; | |
461 | unsigned long ret = 0; | |
4d7b92ad | 462 | struct reg_window32 *rw; |
1da177e4 LT |
463 | int count = 0; |
464 | ||
465 | if (!task || task == current || | |
466 | task->state == TASK_RUNNING) | |
467 | goto out; | |
468 | ||
d562ef6a | 469 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
470 | do { |
471 | /* Bogus frame pointer? */ | |
472 | if (fp < (task_base + sizeof(struct thread_info)) || | |
473 | fp >= (task_base + (2 * PAGE_SIZE))) | |
474 | break; | |
4d7b92ad | 475 | rw = (struct reg_window32 *) fp; |
1da177e4 LT |
476 | pc = rw->ins[7]; |
477 | if (!in_sched_functions(pc)) { | |
478 | ret = pc; | |
479 | goto out; | |
480 | } | |
481 | fp = rw->ins[6] + bias; | |
482 | } while (++count < 16); | |
483 | ||
484 | out: | |
485 | return ret; | |
486 | } | |
487 |