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1da177e4 LT |
1 | /* $Id: process.c,v 1.161 2002/01/23 11:27:32 davem Exp $ |
2 | * linux/arch/sparc/kernel/process.c | |
3 | * | |
4 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
5 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) | |
6 | */ | |
7 | ||
8 | /* | |
9 | * This file handles the architecture-dependent parts of process handling.. | |
10 | */ | |
11 | ||
12 | #include <stdarg.h> | |
13 | ||
14 | #include <linux/errno.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/kallsyms.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/stddef.h> | |
21 | #include <linux/ptrace.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/user.h> | |
24 | #include <linux/a.out.h> | |
25 | #include <linux/config.h> | |
26 | #include <linux/smp.h> | |
27 | #include <linux/smp_lock.h> | |
28 | #include <linux/reboot.h> | |
29 | #include <linux/delay.h> | |
30 | #include <linux/pm.h> | |
31 | #include <linux/init.h> | |
32 | ||
33 | #include <asm/auxio.h> | |
34 | #include <asm/oplib.h> | |
35 | #include <asm/uaccess.h> | |
36 | #include <asm/system.h> | |
37 | #include <asm/page.h> | |
38 | #include <asm/pgalloc.h> | |
39 | #include <asm/pgtable.h> | |
40 | #include <asm/delay.h> | |
41 | #include <asm/processor.h> | |
42 | #include <asm/psr.h> | |
43 | #include <asm/elf.h> | |
44 | #include <asm/unistd.h> | |
45 | ||
46 | /* | |
47 | * Power management idle function | |
48 | * Set in pm platform drivers (apc.c and pmc.c) | |
49 | */ | |
50 | void (*pm_idle)(void); | |
51 | ||
52 | /* | |
53 | * Power-off handler instantiation for pm.h compliance | |
54 | * This is done via auxio, but could be used as a fallback | |
55 | * handler when auxio is not present-- unused for now... | |
56 | */ | |
57 | void (*pm_power_off)(void); | |
58 | ||
59 | /* | |
60 | * sysctl - toggle power-off restriction for serial console | |
61 | * systems in machine_power_off() | |
62 | */ | |
63 | int scons_pwroff = 1; | |
64 | ||
65 | extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *); | |
66 | ||
67 | struct task_struct *last_task_used_math = NULL; | |
68 | struct thread_info *current_set[NR_CPUS]; | |
69 | ||
70 | /* | |
71 | * default_idle is new in 2.5. XXX Review, currently stolen from sparc64. | |
72 | */ | |
73 | void default_idle(void) | |
74 | { | |
75 | } | |
76 | ||
77 | #ifndef CONFIG_SMP | |
78 | ||
79 | #define SUN4C_FAULT_HIGH 100 | |
80 | ||
81 | /* | |
82 | * the idle loop on a Sparc... ;) | |
83 | */ | |
84 | void cpu_idle(void) | |
85 | { | |
1da177e4 LT |
86 | /* endless idle loop with no priority at all */ |
87 | for (;;) { | |
88 | if (ARCH_SUN4C_SUN4) { | |
89 | static int count = HZ; | |
90 | static unsigned long last_jiffies; | |
91 | static unsigned long last_faults; | |
92 | static unsigned long fps; | |
93 | unsigned long now; | |
94 | unsigned long faults; | |
95 | unsigned long flags; | |
96 | ||
97 | extern unsigned long sun4c_kernel_faults; | |
98 | extern void sun4c_grow_kernel_ring(void); | |
99 | ||
100 | local_irq_save(flags); | |
101 | now = jiffies; | |
102 | count -= (now - last_jiffies); | |
103 | last_jiffies = now; | |
104 | if (count < 0) { | |
105 | count += HZ; | |
106 | faults = sun4c_kernel_faults; | |
107 | fps = (fps + (faults - last_faults)) >> 1; | |
108 | last_faults = faults; | |
109 | #if 0 | |
110 | printk("kernel faults / second = %ld\n", fps); | |
111 | #endif | |
112 | if (fps >= SUN4C_FAULT_HIGH) { | |
113 | sun4c_grow_kernel_ring(); | |
114 | } | |
115 | } | |
116 | local_irq_restore(flags); | |
117 | } | |
118 | ||
119 | while((!need_resched()) && pm_idle) { | |
120 | (*pm_idle)(); | |
121 | } | |
122 | ||
123 | schedule(); | |
124 | check_pgt_cache(); | |
125 | } | |
1da177e4 LT |
126 | } |
127 | ||
128 | #else | |
129 | ||
130 | /* This is being executed in task 0 'user space'. */ | |
131 | void cpu_idle(void) | |
132 | { | |
133 | /* endless idle loop with no priority at all */ | |
134 | while(1) { | |
135 | if(need_resched()) { | |
136 | schedule(); | |
137 | check_pgt_cache(); | |
138 | } | |
139 | barrier(); /* or else gcc optimizes... */ | |
140 | } | |
141 | } | |
142 | ||
143 | #endif | |
144 | ||
145 | extern char reboot_command []; | |
146 | ||
147 | extern void (*prom_palette)(int); | |
148 | ||
149 | /* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */ | |
150 | void machine_halt(void) | |
151 | { | |
152 | local_irq_enable(); | |
153 | mdelay(8); | |
154 | local_irq_disable(); | |
155 | if (!serial_console && prom_palette) | |
156 | prom_palette (1); | |
157 | prom_halt(); | |
158 | panic("Halt failed!"); | |
159 | } | |
160 | ||
1da177e4 LT |
161 | void machine_restart(char * cmd) |
162 | { | |
163 | char *p; | |
164 | ||
165 | local_irq_enable(); | |
166 | mdelay(8); | |
167 | local_irq_disable(); | |
168 | ||
169 | p = strchr (reboot_command, '\n'); | |
170 | if (p) *p = 0; | |
171 | if (!serial_console && prom_palette) | |
172 | prom_palette (1); | |
173 | if (cmd) | |
174 | prom_reboot(cmd); | |
175 | if (*reboot_command) | |
176 | prom_reboot(reboot_command); | |
177 | prom_feval ("reset"); | |
178 | panic("Reboot failed!"); | |
179 | } | |
180 | ||
1da177e4 LT |
181 | void machine_power_off(void) |
182 | { | |
183 | #ifdef CONFIG_SUN_AUXIO | |
184 | if (auxio_power_register && (!serial_console || scons_pwroff)) | |
185 | *auxio_power_register |= AUXIO_POWER_OFF; | |
186 | #endif | |
187 | machine_halt(); | |
188 | } | |
189 | ||
1da177e4 LT |
190 | static DEFINE_SPINLOCK(sparc_backtrace_lock); |
191 | ||
192 | void __show_backtrace(unsigned long fp) | |
193 | { | |
194 | struct reg_window *rw; | |
195 | unsigned long flags; | |
196 | int cpu = smp_processor_id(); | |
197 | ||
198 | spin_lock_irqsave(&sparc_backtrace_lock, flags); | |
199 | ||
200 | rw = (struct reg_window *)fp; | |
201 | while(rw && (((unsigned long) rw) >= PAGE_OFFSET) && | |
202 | !(((unsigned long) rw) & 0x7)) { | |
203 | printk("CPU[%d]: ARGS[%08lx,%08lx,%08lx,%08lx,%08lx,%08lx] " | |
204 | "FP[%08lx] CALLER[%08lx]: ", cpu, | |
205 | rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3], | |
206 | rw->ins[4], rw->ins[5], | |
207 | rw->ins[6], | |
208 | rw->ins[7]); | |
209 | print_symbol("%s\n", rw->ins[7]); | |
210 | rw = (struct reg_window *) rw->ins[6]; | |
211 | } | |
212 | spin_unlock_irqrestore(&sparc_backtrace_lock, flags); | |
213 | } | |
214 | ||
215 | #define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t") | |
216 | #define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t") | |
217 | #define __GET_FP(fp) __asm__ __volatile__("mov %%i6, %0" : "=r" (fp)) | |
218 | ||
219 | void show_backtrace(void) | |
220 | { | |
221 | unsigned long fp; | |
222 | ||
223 | __SAVE; __SAVE; __SAVE; __SAVE; | |
224 | __SAVE; __SAVE; __SAVE; __SAVE; | |
225 | __RESTORE; __RESTORE; __RESTORE; __RESTORE; | |
226 | __RESTORE; __RESTORE; __RESTORE; __RESTORE; | |
227 | ||
228 | __GET_FP(fp); | |
229 | ||
230 | __show_backtrace(fp); | |
231 | } | |
232 | ||
233 | #ifdef CONFIG_SMP | |
234 | void smp_show_backtrace_all_cpus(void) | |
235 | { | |
236 | xc0((smpfunc_t) show_backtrace); | |
237 | show_backtrace(); | |
238 | } | |
239 | #endif | |
240 | ||
241 | #if 0 | |
242 | void show_stackframe(struct sparc_stackf *sf) | |
243 | { | |
244 | unsigned long size; | |
245 | unsigned long *stk; | |
246 | int i; | |
247 | ||
248 | printk("l0: %08lx l1: %08lx l2: %08lx l3: %08lx " | |
249 | "l4: %08lx l5: %08lx l6: %08lx l7: %08lx\n", | |
250 | sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3], | |
251 | sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]); | |
252 | printk("i0: %08lx i1: %08lx i2: %08lx i3: %08lx " | |
253 | "i4: %08lx i5: %08lx fp: %08lx i7: %08lx\n", | |
254 | sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3], | |
255 | sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc); | |
256 | printk("sp: %08lx x0: %08lx x1: %08lx x2: %08lx " | |
257 | "x3: %08lx x4: %08lx x5: %08lx xx: %08lx\n", | |
258 | (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1], | |
259 | sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5], | |
260 | sf->xxargs[0]); | |
261 | size = ((unsigned long)sf->fp) - ((unsigned long)sf); | |
262 | size -= STACKFRAME_SZ; | |
263 | stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ); | |
264 | i = 0; | |
265 | do { | |
266 | printk("s%d: %08lx\n", i++, *stk++); | |
267 | } while ((size -= sizeof(unsigned long))); | |
268 | } | |
269 | #endif | |
270 | ||
271 | void show_regs(struct pt_regs *r) | |
272 | { | |
273 | struct reg_window *rw = (struct reg_window *) r->u_regs[14]; | |
274 | ||
275 | printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx %s\n", | |
276 | r->psr, r->pc, r->npc, r->y, print_tainted()); | |
277 | print_symbol("PC: <%s>\n", r->pc); | |
278 | printk("%%G: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
279 | r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3], | |
280 | r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]); | |
281 | printk("%%O: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
282 | r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11], | |
283 | r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]); | |
284 | print_symbol("RPC: <%s>\n", r->u_regs[15]); | |
285 | ||
286 | printk("%%L: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
287 | rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3], | |
288 | rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]); | |
289 | printk("%%I: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
290 | rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3], | |
291 | rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]); | |
292 | } | |
293 | ||
294 | /* | |
295 | * The show_stack is an external API which we do not use ourselves. | |
296 | * The oops is printed in die_if_kernel. | |
297 | */ | |
298 | void show_stack(struct task_struct *tsk, unsigned long *_ksp) | |
299 | { | |
300 | unsigned long pc, fp; | |
301 | unsigned long task_base; | |
302 | struct reg_window *rw; | |
303 | int count = 0; | |
304 | ||
305 | if (tsk != NULL) | |
306 | task_base = (unsigned long) tsk->thread_info; | |
307 | else | |
308 | task_base = (unsigned long) current_thread_info(); | |
309 | ||
310 | fp = (unsigned long) _ksp; | |
311 | do { | |
312 | /* Bogus frame pointer? */ | |
313 | if (fp < (task_base + sizeof(struct thread_info)) || | |
314 | fp >= (task_base + (PAGE_SIZE << 1))) | |
315 | break; | |
316 | rw = (struct reg_window *) fp; | |
317 | pc = rw->ins[7]; | |
318 | printk("[%08lx : ", pc); | |
319 | print_symbol("%s ] ", pc); | |
320 | fp = rw->ins[6]; | |
321 | } while (++count < 16); | |
322 | printk("\n"); | |
323 | } | |
324 | ||
24dc6ead TC |
325 | void dump_stack(void) |
326 | { | |
327 | unsigned long *ksp; | |
328 | ||
329 | __asm__ __volatile__("mov %%fp, %0" | |
330 | : "=r" (ksp)); | |
331 | show_stack(current, ksp); | |
332 | } | |
333 | ||
334 | EXPORT_SYMBOL(dump_stack); | |
335 | ||
1da177e4 LT |
336 | /* |
337 | * Note: sparc64 has a pretty intricated thread_saved_pc, check it out. | |
338 | */ | |
339 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
340 | { | |
341 | return tsk->thread_info->kpc; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Free current thread data structures etc.. | |
346 | */ | |
347 | void exit_thread(void) | |
348 | { | |
349 | #ifndef CONFIG_SMP | |
350 | if(last_task_used_math == current) { | |
351 | #else | |
352 | if(current_thread_info()->flags & _TIF_USEDFPU) { | |
353 | #endif | |
354 | /* Keep process from leaving FPU in a bogon state. */ | |
355 | put_psr(get_psr() | PSR_EF); | |
356 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
357 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
358 | #ifndef CONFIG_SMP | |
359 | last_task_used_math = NULL; | |
360 | #else | |
361 | current_thread_info()->flags &= ~_TIF_USEDFPU; | |
362 | #endif | |
363 | } | |
364 | } | |
365 | ||
366 | void flush_thread(void) | |
367 | { | |
368 | current_thread_info()->w_saved = 0; | |
369 | ||
370 | /* No new signal delivery by default */ | |
371 | current->thread.new_signal = 0; | |
372 | #ifndef CONFIG_SMP | |
373 | if(last_task_used_math == current) { | |
374 | #else | |
375 | if(current_thread_info()->flags & _TIF_USEDFPU) { | |
376 | #endif | |
377 | /* Clean the fpu. */ | |
378 | put_psr(get_psr() | PSR_EF); | |
379 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
380 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
381 | #ifndef CONFIG_SMP | |
382 | last_task_used_math = NULL; | |
383 | #else | |
384 | current_thread_info()->flags &= ~_TIF_USEDFPU; | |
385 | #endif | |
386 | } | |
387 | ||
388 | /* Now, this task is no longer a kernel thread. */ | |
389 | current->thread.current_ds = USER_DS; | |
390 | if (current->thread.flags & SPARC_FLAG_KTHREAD) { | |
391 | current->thread.flags &= ~SPARC_FLAG_KTHREAD; | |
392 | ||
393 | /* We must fixup kregs as well. */ | |
394 | /* XXX This was not fixed for ti for a while, worked. Unused? */ | |
395 | current->thread.kregs = (struct pt_regs *) | |
396 | ((char *)current->thread_info + (THREAD_SIZE - TRACEREG_SZ)); | |
397 | } | |
398 | } | |
399 | ||
400 | static __inline__ struct sparc_stackf __user * | |
401 | clone_stackframe(struct sparc_stackf __user *dst, | |
402 | struct sparc_stackf __user *src) | |
403 | { | |
404 | unsigned long size, fp; | |
405 | struct sparc_stackf *tmp; | |
406 | struct sparc_stackf __user *sp; | |
407 | ||
408 | if (get_user(tmp, &src->fp)) | |
409 | return NULL; | |
410 | ||
411 | fp = (unsigned long) tmp; | |
412 | size = (fp - ((unsigned long) src)); | |
413 | fp = (unsigned long) dst; | |
414 | sp = (struct sparc_stackf __user *)(fp - size); | |
415 | ||
416 | /* do_fork() grabs the parent semaphore, we must release it | |
417 | * temporarily so we can build the child clone stack frame | |
418 | * without deadlocking. | |
419 | */ | |
420 | if (__copy_user(sp, src, size)) | |
421 | sp = NULL; | |
422 | else if (put_user(fp, &sp->fp)) | |
423 | sp = NULL; | |
424 | ||
425 | return sp; | |
426 | } | |
427 | ||
428 | asmlinkage int sparc_do_fork(unsigned long clone_flags, | |
429 | unsigned long stack_start, | |
430 | struct pt_regs *regs, | |
431 | unsigned long stack_size) | |
432 | { | |
433 | unsigned long parent_tid_ptr, child_tid_ptr; | |
434 | ||
435 | parent_tid_ptr = regs->u_regs[UREG_I2]; | |
436 | child_tid_ptr = regs->u_regs[UREG_I4]; | |
437 | ||
438 | return do_fork(clone_flags, stack_start, | |
439 | regs, stack_size, | |
440 | (int __user *) parent_tid_ptr, | |
441 | (int __user *) child_tid_ptr); | |
442 | } | |
443 | ||
444 | /* Copy a Sparc thread. The fork() return value conventions | |
445 | * under SunOS are nothing short of bletcherous: | |
446 | * Parent --> %o0 == childs pid, %o1 == 0 | |
447 | * Child --> %o0 == parents pid, %o1 == 1 | |
448 | * | |
449 | * NOTE: We have a separate fork kpsr/kwim because | |
450 | * the parent could change these values between | |
451 | * sys_fork invocation and when we reach here | |
452 | * if the parent should sleep while trying to | |
453 | * allocate the task_struct and kernel stack in | |
454 | * do_fork(). | |
455 | * XXX See comment above sys_vfork in sparc64. todo. | |
456 | */ | |
457 | extern void ret_from_fork(void); | |
458 | ||
459 | int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, | |
460 | unsigned long unused, | |
461 | struct task_struct *p, struct pt_regs *regs) | |
462 | { | |
463 | struct thread_info *ti = p->thread_info; | |
464 | struct pt_regs *childregs; | |
465 | char *new_stack; | |
466 | ||
467 | #ifndef CONFIG_SMP | |
468 | if(last_task_used_math == current) { | |
469 | #else | |
470 | if(current_thread_info()->flags & _TIF_USEDFPU) { | |
471 | #endif | |
472 | put_psr(get_psr() | PSR_EF); | |
473 | fpsave(&p->thread.float_regs[0], &p->thread.fsr, | |
474 | &p->thread.fpqueue[0], &p->thread.fpqdepth); | |
475 | #ifdef CONFIG_SMP | |
476 | current_thread_info()->flags &= ~_TIF_USEDFPU; | |
477 | #endif | |
478 | } | |
479 | ||
480 | /* | |
481 | * p->thread_info new_stack childregs | |
482 | * ! ! ! {if(PSR_PS) } | |
483 | * V V (stk.fr.) V (pt_regs) { (stk.fr.) } | |
484 | * +----- - - - - - ------+===========+============={+==========}+ | |
485 | */ | |
486 | new_stack = (char*)ti + THREAD_SIZE; | |
487 | if (regs->psr & PSR_PS) | |
488 | new_stack -= STACKFRAME_SZ; | |
489 | new_stack -= STACKFRAME_SZ + TRACEREG_SZ; | |
490 | memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ); | |
491 | childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ); | |
492 | ||
493 | /* | |
494 | * A new process must start with interrupts closed in 2.5, | |
495 | * because this is how Mingo's scheduler works (see schedule_tail | |
496 | * and finish_arch_switch). If we do not do it, a timer interrupt hits | |
497 | * before we unlock, attempts to re-take the rq->lock, and then we die. | |
498 | * Thus, kpsr|=PSR_PIL. | |
499 | */ | |
500 | ti->ksp = (unsigned long) new_stack; | |
501 | ti->kpc = (((unsigned long) ret_from_fork) - 0x8); | |
502 | ti->kpsr = current->thread.fork_kpsr | PSR_PIL; | |
503 | ti->kwim = current->thread.fork_kwim; | |
504 | ||
505 | if(regs->psr & PSR_PS) { | |
506 | extern struct pt_regs fake_swapper_regs; | |
507 | ||
508 | p->thread.kregs = &fake_swapper_regs; | |
509 | new_stack += STACKFRAME_SZ + TRACEREG_SZ; | |
510 | childregs->u_regs[UREG_FP] = (unsigned long) new_stack; | |
511 | p->thread.flags |= SPARC_FLAG_KTHREAD; | |
512 | p->thread.current_ds = KERNEL_DS; | |
513 | memcpy(new_stack, (void *)regs->u_regs[UREG_FP], STACKFRAME_SZ); | |
514 | childregs->u_regs[UREG_G6] = (unsigned long) ti; | |
515 | } else { | |
516 | p->thread.kregs = childregs; | |
517 | childregs->u_regs[UREG_FP] = sp; | |
518 | p->thread.flags &= ~SPARC_FLAG_KTHREAD; | |
519 | p->thread.current_ds = USER_DS; | |
520 | ||
521 | if (sp != regs->u_regs[UREG_FP]) { | |
522 | struct sparc_stackf __user *childstack; | |
523 | struct sparc_stackf __user *parentstack; | |
524 | ||
525 | /* | |
526 | * This is a clone() call with supplied user stack. | |
527 | * Set some valid stack frames to give to the child. | |
528 | */ | |
529 | childstack = (struct sparc_stackf __user *) | |
530 | (sp & ~0x7UL); | |
531 | parentstack = (struct sparc_stackf __user *) | |
532 | regs->u_regs[UREG_FP]; | |
533 | ||
534 | #if 0 | |
535 | printk("clone: parent stack:\n"); | |
536 | show_stackframe(parentstack); | |
537 | #endif | |
538 | ||
539 | childstack = clone_stackframe(childstack, parentstack); | |
540 | if (!childstack) | |
541 | return -EFAULT; | |
542 | ||
543 | #if 0 | |
544 | printk("clone: child stack:\n"); | |
545 | show_stackframe(childstack); | |
546 | #endif | |
547 | ||
548 | childregs->u_regs[UREG_FP] = (unsigned long)childstack; | |
549 | } | |
550 | } | |
551 | ||
552 | #ifdef CONFIG_SMP | |
553 | /* FPU must be disabled on SMP. */ | |
554 | childregs->psr &= ~PSR_EF; | |
555 | #endif | |
556 | ||
557 | /* Set the return value for the child. */ | |
558 | childregs->u_regs[UREG_I0] = current->pid; | |
559 | childregs->u_regs[UREG_I1] = 1; | |
560 | ||
561 | /* Set the return value for the parent. */ | |
562 | regs->u_regs[UREG_I1] = 0; | |
563 | ||
564 | if (clone_flags & CLONE_SETTLS) | |
565 | childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
570 | /* | |
571 | * fill in the user structure for a core dump.. | |
572 | */ | |
573 | void dump_thread(struct pt_regs * regs, struct user * dump) | |
574 | { | |
575 | unsigned long first_stack_page; | |
576 | ||
577 | dump->magic = SUNOS_CORE_MAGIC; | |
578 | dump->len = sizeof(struct user); | |
579 | dump->regs.psr = regs->psr; | |
580 | dump->regs.pc = regs->pc; | |
581 | dump->regs.npc = regs->npc; | |
582 | dump->regs.y = regs->y; | |
583 | /* fuck me plenty */ | |
584 | memcpy(&dump->regs.regs[0], ®s->u_regs[1], (sizeof(unsigned long) * 15)); | |
585 | dump->uexec = current->thread.core_exec; | |
586 | dump->u_tsize = (((unsigned long) current->mm->end_code) - | |
587 | ((unsigned long) current->mm->start_code)) & ~(PAGE_SIZE - 1); | |
588 | dump->u_dsize = ((unsigned long) (current->mm->brk + (PAGE_SIZE-1))); | |
589 | dump->u_dsize -= dump->u_tsize; | |
590 | dump->u_dsize &= ~(PAGE_SIZE - 1); | |
591 | first_stack_page = (regs->u_regs[UREG_FP] & ~(PAGE_SIZE - 1)); | |
592 | dump->u_ssize = (TASK_SIZE - first_stack_page) & ~(PAGE_SIZE - 1); | |
593 | memcpy(&dump->fpu.fpstatus.fregs.regs[0], ¤t->thread.float_regs[0], (sizeof(unsigned long) * 32)); | |
594 | dump->fpu.fpstatus.fsr = current->thread.fsr; | |
595 | dump->fpu.fpstatus.flags = dump->fpu.fpstatus.extra = 0; | |
596 | dump->fpu.fpstatus.fpq_count = current->thread.fpqdepth; | |
597 | memcpy(&dump->fpu.fpstatus.fpq[0], ¤t->thread.fpqueue[0], | |
598 | ((sizeof(unsigned long) * 2) * 16)); | |
599 | dump->sigcode = 0; | |
600 | } | |
601 | ||
602 | /* | |
603 | * fill in the fpu structure for a core dump. | |
604 | */ | |
605 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
606 | { | |
607 | if (used_math()) { | |
608 | memset(fpregs, 0, sizeof(*fpregs)); | |
609 | fpregs->pr_q_entrysize = 8; | |
610 | return 1; | |
611 | } | |
612 | #ifdef CONFIG_SMP | |
613 | if (current_thread_info()->flags & _TIF_USEDFPU) { | |
614 | put_psr(get_psr() | PSR_EF); | |
615 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
616 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
617 | if (regs != NULL) { | |
618 | regs->psr &= ~(PSR_EF); | |
619 | current_thread_info()->flags &= ~(_TIF_USEDFPU); | |
620 | } | |
621 | } | |
622 | #else | |
623 | if (current == last_task_used_math) { | |
624 | put_psr(get_psr() | PSR_EF); | |
625 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
626 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
627 | if (regs != NULL) { | |
628 | regs->psr &= ~(PSR_EF); | |
629 | last_task_used_math = NULL; | |
630 | } | |
631 | } | |
632 | #endif | |
633 | memcpy(&fpregs->pr_fr.pr_regs[0], | |
634 | ¤t->thread.float_regs[0], | |
635 | (sizeof(unsigned long) * 32)); | |
636 | fpregs->pr_fsr = current->thread.fsr; | |
637 | fpregs->pr_qcnt = current->thread.fpqdepth; | |
638 | fpregs->pr_q_entrysize = 8; | |
639 | fpregs->pr_en = 1; | |
640 | if(fpregs->pr_qcnt != 0) { | |
641 | memcpy(&fpregs->pr_q[0], | |
642 | ¤t->thread.fpqueue[0], | |
643 | sizeof(struct fpq) * fpregs->pr_qcnt); | |
644 | } | |
645 | /* Zero out the rest. */ | |
646 | memset(&fpregs->pr_q[fpregs->pr_qcnt], 0, | |
647 | sizeof(struct fpq) * (32 - fpregs->pr_qcnt)); | |
648 | return 1; | |
649 | } | |
650 | ||
651 | /* | |
652 | * sparc_execve() executes a new program after the asm stub has set | |
653 | * things up for us. This should basically do what I want it to. | |
654 | */ | |
655 | asmlinkage int sparc_execve(struct pt_regs *regs) | |
656 | { | |
657 | int error, base = 0; | |
658 | char *filename; | |
659 | ||
660 | /* Check for indirect call. */ | |
661 | if(regs->u_regs[UREG_G1] == 0) | |
662 | base = 1; | |
663 | ||
664 | filename = getname((char __user *)regs->u_regs[base + UREG_I0]); | |
665 | error = PTR_ERR(filename); | |
666 | if(IS_ERR(filename)) | |
667 | goto out; | |
668 | error = do_execve(filename, | |
669 | (char __user * __user *)regs->u_regs[base + UREG_I1], | |
670 | (char __user * __user *)regs->u_regs[base + UREG_I2], | |
671 | regs); | |
672 | putname(filename); | |
673 | if (error == 0) { | |
674 | task_lock(current); | |
675 | current->ptrace &= ~PT_DTRACE; | |
676 | task_unlock(current); | |
677 | } | |
678 | out: | |
679 | return error; | |
680 | } | |
681 | ||
682 | /* | |
683 | * This is the mechanism for creating a new kernel thread. | |
684 | * | |
685 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
686 | * who haven't done an "execve()") should use this: it will work within | |
687 | * a system call from a "real" process, but the process memory space will | |
688 | * not be free'd until both the parent and the child have exited. | |
689 | */ | |
690 | pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
691 | { | |
692 | long retval; | |
693 | ||
694 | __asm__ __volatile__("mov %4, %%g2\n\t" /* Set aside fn ptr... */ | |
695 | "mov %5, %%g3\n\t" /* and arg. */ | |
696 | "mov %1, %%g1\n\t" | |
697 | "mov %2, %%o0\n\t" /* Clone flags. */ | |
698 | "mov 0, %%o1\n\t" /* usp arg == 0 */ | |
699 | "t 0x10\n\t" /* Linux/Sparc clone(). */ | |
700 | "cmp %%o1, 0\n\t" | |
701 | "be 1f\n\t" /* The parent, just return. */ | |
702 | " nop\n\t" /* Delay slot. */ | |
703 | "jmpl %%g2, %%o7\n\t" /* Call the function. */ | |
704 | " mov %%g3, %%o0\n\t" /* Get back the arg in delay. */ | |
705 | "mov %3, %%g1\n\t" | |
706 | "t 0x10\n\t" /* Linux/Sparc exit(). */ | |
707 | /* Notreached by child. */ | |
708 | "1: mov %%o0, %0\n\t" : | |
709 | "=r" (retval) : | |
710 | "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), | |
711 | "i" (__NR_exit), "r" (fn), "r" (arg) : | |
712 | "g1", "g2", "g3", "o0", "o1", "memory", "cc"); | |
713 | return retval; | |
714 | } | |
715 | ||
716 | unsigned long get_wchan(struct task_struct *task) | |
717 | { | |
718 | unsigned long pc, fp, bias = 0; | |
719 | unsigned long task_base = (unsigned long) task; | |
720 | unsigned long ret = 0; | |
721 | struct reg_window *rw; | |
722 | int count = 0; | |
723 | ||
724 | if (!task || task == current || | |
725 | task->state == TASK_RUNNING) | |
726 | goto out; | |
727 | ||
728 | fp = task->thread_info->ksp + bias; | |
729 | do { | |
730 | /* Bogus frame pointer? */ | |
731 | if (fp < (task_base + sizeof(struct thread_info)) || | |
732 | fp >= (task_base + (2 * PAGE_SIZE))) | |
733 | break; | |
734 | rw = (struct reg_window *) fp; | |
735 | pc = rw->ins[7]; | |
736 | if (!in_sched_functions(pc)) { | |
737 | ret = pc; | |
738 | goto out; | |
739 | } | |
740 | fp = rw->ins[6] + bias; | |
741 | } while (++count < 16); | |
742 | ||
743 | out: | |
744 | return ret; | |
745 | } | |
746 |