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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> | |
1da177e4 LT |
25 | #include <linux/smp.h> |
26 | #include <linux/smp_lock.h> | |
27 | #include <linux/reboot.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/pm.h> | |
30 | #include <linux/init.h> | |
31 | ||
32 | #include <asm/auxio.h> | |
33 | #include <asm/oplib.h> | |
34 | #include <asm/uaccess.h> | |
35 | #include <asm/system.h> | |
36 | #include <asm/page.h> | |
37 | #include <asm/pgalloc.h> | |
38 | #include <asm/pgtable.h> | |
39 | #include <asm/delay.h> | |
40 | #include <asm/processor.h> | |
41 | #include <asm/psr.h> | |
42 | #include <asm/elf.h> | |
43 | #include <asm/unistd.h> | |
44 | ||
45 | /* | |
46 | * Power management idle function | |
47 | * Set in pm platform drivers (apc.c and pmc.c) | |
48 | */ | |
49 | void (*pm_idle)(void); | |
50 | ||
51 | /* | |
52 | * Power-off handler instantiation for pm.h compliance | |
53 | * This is done via auxio, but could be used as a fallback | |
54 | * handler when auxio is not present-- unused for now... | |
55 | */ | |
304cd3ef | 56 | void (*pm_power_off)(void) = machine_power_off; |
89eb1693 | 57 | EXPORT_SYMBOL(pm_power_off); |
1da177e4 LT |
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 | ||
1da177e4 LT |
70 | #ifndef CONFIG_SMP |
71 | ||
72 | #define SUN4C_FAULT_HIGH 100 | |
73 | ||
74 | /* | |
75 | * the idle loop on a Sparc... ;) | |
76 | */ | |
77 | void cpu_idle(void) | |
78 | { | |
1da177e4 LT |
79 | /* endless idle loop with no priority at all */ |
80 | for (;;) { | |
81 | if (ARCH_SUN4C_SUN4) { | |
82 | static int count = HZ; | |
83 | static unsigned long last_jiffies; | |
84 | static unsigned long last_faults; | |
85 | static unsigned long fps; | |
86 | unsigned long now; | |
87 | unsigned long faults; | |
1da177e4 LT |
88 | |
89 | extern unsigned long sun4c_kernel_faults; | |
90 | extern void sun4c_grow_kernel_ring(void); | |
91 | ||
64c7c8f8 | 92 | local_irq_disable(); |
1da177e4 LT |
93 | now = jiffies; |
94 | count -= (now - last_jiffies); | |
95 | last_jiffies = now; | |
96 | if (count < 0) { | |
97 | count += HZ; | |
98 | faults = sun4c_kernel_faults; | |
99 | fps = (fps + (faults - last_faults)) >> 1; | |
100 | last_faults = faults; | |
101 | #if 0 | |
102 | printk("kernel faults / second = %ld\n", fps); | |
103 | #endif | |
104 | if (fps >= SUN4C_FAULT_HIGH) { | |
105 | sun4c_grow_kernel_ring(); | |
106 | } | |
107 | } | |
64c7c8f8 | 108 | local_irq_enable(); |
1da177e4 LT |
109 | } |
110 | ||
64c7c8f8 NP |
111 | if (pm_idle) { |
112 | while (!need_resched()) | |
113 | (*pm_idle)(); | |
114 | } else { | |
115 | while (!need_resched()) | |
116 | cpu_relax(); | |
1da177e4 | 117 | } |
5bfb5d69 | 118 | preempt_enable_no_resched(); |
1da177e4 | 119 | schedule(); |
5bfb5d69 | 120 | preempt_disable(); |
1da177e4 LT |
121 | check_pgt_cache(); |
122 | } | |
1da177e4 LT |
123 | } |
124 | ||
125 | #else | |
126 | ||
127 | /* This is being executed in task 0 'user space'. */ | |
128 | void cpu_idle(void) | |
129 | { | |
64c7c8f8 | 130 | set_thread_flag(TIF_POLLING_NRFLAG); |
1da177e4 LT |
131 | /* endless idle loop with no priority at all */ |
132 | while(1) { | |
64c7c8f8 NP |
133 | while (!need_resched()) |
134 | cpu_relax(); | |
135 | preempt_enable_no_resched(); | |
136 | schedule(); | |
137 | preempt_disable(); | |
138 | check_pgt_cache(); | |
1da177e4 LT |
139 | } |
140 | } | |
141 | ||
142 | #endif | |
143 | ||
144 | extern char reboot_command []; | |
145 | ||
146 | extern void (*prom_palette)(int); | |
147 | ||
148 | /* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */ | |
149 | void machine_halt(void) | |
150 | { | |
151 | local_irq_enable(); | |
152 | mdelay(8); | |
153 | local_irq_disable(); | |
154 | if (!serial_console && prom_palette) | |
155 | prom_palette (1); | |
156 | prom_halt(); | |
157 | panic("Halt failed!"); | |
158 | } | |
159 | ||
1da177e4 LT |
160 | void machine_restart(char * cmd) |
161 | { | |
162 | char *p; | |
163 | ||
164 | local_irq_enable(); | |
165 | mdelay(8); | |
166 | local_irq_disable(); | |
167 | ||
168 | p = strchr (reboot_command, '\n'); | |
169 | if (p) *p = 0; | |
170 | if (!serial_console && prom_palette) | |
171 | prom_palette (1); | |
172 | if (cmd) | |
173 | prom_reboot(cmd); | |
174 | if (*reboot_command) | |
175 | prom_reboot(reboot_command); | |
176 | prom_feval ("reset"); | |
177 | panic("Reboot failed!"); | |
178 | } | |
179 | ||
1da177e4 LT |
180 | void machine_power_off(void) |
181 | { | |
182 | #ifdef CONFIG_SUN_AUXIO | |
183 | if (auxio_power_register && (!serial_console || scons_pwroff)) | |
184 | *auxio_power_register |= AUXIO_POWER_OFF; | |
185 | #endif | |
186 | machine_halt(); | |
187 | } | |
188 | ||
1da177e4 LT |
189 | static DEFINE_SPINLOCK(sparc_backtrace_lock); |
190 | ||
191 | void __show_backtrace(unsigned long fp) | |
192 | { | |
193 | struct reg_window *rw; | |
194 | unsigned long flags; | |
195 | int cpu = smp_processor_id(); | |
196 | ||
197 | spin_lock_irqsave(&sparc_backtrace_lock, flags); | |
198 | ||
199 | rw = (struct reg_window *)fp; | |
200 | while(rw && (((unsigned long) rw) >= PAGE_OFFSET) && | |
201 | !(((unsigned long) rw) & 0x7)) { | |
202 | printk("CPU[%d]: ARGS[%08lx,%08lx,%08lx,%08lx,%08lx,%08lx] " | |
203 | "FP[%08lx] CALLER[%08lx]: ", cpu, | |
204 | rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3], | |
205 | rw->ins[4], rw->ins[5], | |
206 | rw->ins[6], | |
207 | rw->ins[7]); | |
208 | print_symbol("%s\n", rw->ins[7]); | |
209 | rw = (struct reg_window *) rw->ins[6]; | |
210 | } | |
211 | spin_unlock_irqrestore(&sparc_backtrace_lock, flags); | |
212 | } | |
213 | ||
214 | #define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t") | |
215 | #define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t") | |
216 | #define __GET_FP(fp) __asm__ __volatile__("mov %%i6, %0" : "=r" (fp)) | |
217 | ||
218 | void show_backtrace(void) | |
219 | { | |
220 | unsigned long fp; | |
221 | ||
222 | __SAVE; __SAVE; __SAVE; __SAVE; | |
223 | __SAVE; __SAVE; __SAVE; __SAVE; | |
224 | __RESTORE; __RESTORE; __RESTORE; __RESTORE; | |
225 | __RESTORE; __RESTORE; __RESTORE; __RESTORE; | |
226 | ||
227 | __GET_FP(fp); | |
228 | ||
229 | __show_backtrace(fp); | |
230 | } | |
231 | ||
232 | #ifdef CONFIG_SMP | |
233 | void smp_show_backtrace_all_cpus(void) | |
234 | { | |
235 | xc0((smpfunc_t) show_backtrace); | |
236 | show_backtrace(); | |
237 | } | |
238 | #endif | |
239 | ||
240 | #if 0 | |
241 | void show_stackframe(struct sparc_stackf *sf) | |
242 | { | |
243 | unsigned long size; | |
244 | unsigned long *stk; | |
245 | int i; | |
246 | ||
247 | printk("l0: %08lx l1: %08lx l2: %08lx l3: %08lx " | |
248 | "l4: %08lx l5: %08lx l6: %08lx l7: %08lx\n", | |
249 | sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3], | |
250 | sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]); | |
251 | printk("i0: %08lx i1: %08lx i2: %08lx i3: %08lx " | |
252 | "i4: %08lx i5: %08lx fp: %08lx i7: %08lx\n", | |
253 | sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3], | |
254 | sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc); | |
255 | printk("sp: %08lx x0: %08lx x1: %08lx x2: %08lx " | |
256 | "x3: %08lx x4: %08lx x5: %08lx xx: %08lx\n", | |
257 | (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1], | |
258 | sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5], | |
259 | sf->xxargs[0]); | |
260 | size = ((unsigned long)sf->fp) - ((unsigned long)sf); | |
261 | size -= STACKFRAME_SZ; | |
262 | stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ); | |
263 | i = 0; | |
264 | do { | |
265 | printk("s%d: %08lx\n", i++, *stk++); | |
266 | } while ((size -= sizeof(unsigned long))); | |
267 | } | |
268 | #endif | |
269 | ||
270 | void show_regs(struct pt_regs *r) | |
271 | { | |
272 | struct reg_window *rw = (struct reg_window *) r->u_regs[14]; | |
273 | ||
274 | printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx %s\n", | |
275 | r->psr, r->pc, r->npc, r->y, print_tainted()); | |
276 | print_symbol("PC: <%s>\n", r->pc); | |
277 | printk("%%G: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
278 | r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3], | |
279 | r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]); | |
280 | printk("%%O: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
281 | r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11], | |
282 | r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]); | |
283 | print_symbol("RPC: <%s>\n", r->u_regs[15]); | |
284 | ||
285 | printk("%%L: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
286 | rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3], | |
287 | rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]); | |
288 | printk("%%I: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
289 | rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3], | |
290 | rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]); | |
291 | } | |
292 | ||
293 | /* | |
294 | * The show_stack is an external API which we do not use ourselves. | |
295 | * The oops is printed in die_if_kernel. | |
296 | */ | |
297 | void show_stack(struct task_struct *tsk, unsigned long *_ksp) | |
298 | { | |
299 | unsigned long pc, fp; | |
300 | unsigned long task_base; | |
301 | struct reg_window *rw; | |
302 | int count = 0; | |
303 | ||
304 | if (tsk != NULL) | |
36483c6b | 305 | task_base = (unsigned long) task_stack_page(tsk); |
1da177e4 LT |
306 | else |
307 | task_base = (unsigned long) current_thread_info(); | |
308 | ||
309 | fp = (unsigned long) _ksp; | |
310 | do { | |
311 | /* Bogus frame pointer? */ | |
312 | if (fp < (task_base + sizeof(struct thread_info)) || | |
313 | fp >= (task_base + (PAGE_SIZE << 1))) | |
314 | break; | |
315 | rw = (struct reg_window *) fp; | |
316 | pc = rw->ins[7]; | |
317 | printk("[%08lx : ", pc); | |
318 | print_symbol("%s ] ", pc); | |
319 | fp = rw->ins[6]; | |
320 | } while (++count < 16); | |
321 | printk("\n"); | |
322 | } | |
323 | ||
24dc6ead TC |
324 | void dump_stack(void) |
325 | { | |
326 | unsigned long *ksp; | |
327 | ||
328 | __asm__ __volatile__("mov %%fp, %0" | |
329 | : "=r" (ksp)); | |
330 | show_stack(current, ksp); | |
331 | } | |
332 | ||
333 | EXPORT_SYMBOL(dump_stack); | |
334 | ||
1da177e4 LT |
335 | /* |
336 | * Note: sparc64 has a pretty intricated thread_saved_pc, check it out. | |
337 | */ | |
338 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
339 | { | |
d562ef6a | 340 | return task_thread_info(tsk)->kpc; |
1da177e4 LT |
341 | } |
342 | ||
343 | /* | |
344 | * Free current thread data structures etc.. | |
345 | */ | |
346 | void exit_thread(void) | |
347 | { | |
348 | #ifndef CONFIG_SMP | |
349 | if(last_task_used_math == current) { | |
350 | #else | |
351 | if(current_thread_info()->flags & _TIF_USEDFPU) { | |
352 | #endif | |
353 | /* Keep process from leaving FPU in a bogon state. */ | |
354 | put_psr(get_psr() | PSR_EF); | |
355 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
356 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
357 | #ifndef CONFIG_SMP | |
358 | last_task_used_math = NULL; | |
359 | #else | |
360 | current_thread_info()->flags &= ~_TIF_USEDFPU; | |
361 | #endif | |
362 | } | |
363 | } | |
364 | ||
365 | void flush_thread(void) | |
366 | { | |
367 | current_thread_info()->w_saved = 0; | |
368 | ||
369 | /* No new signal delivery by default */ | |
370 | current->thread.new_signal = 0; | |
371 | #ifndef CONFIG_SMP | |
372 | if(last_task_used_math == current) { | |
373 | #else | |
374 | if(current_thread_info()->flags & _TIF_USEDFPU) { | |
375 | #endif | |
376 | /* Clean the fpu. */ | |
377 | put_psr(get_psr() | PSR_EF); | |
378 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
379 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
380 | #ifndef CONFIG_SMP | |
381 | last_task_used_math = NULL; | |
382 | #else | |
383 | current_thread_info()->flags &= ~_TIF_USEDFPU; | |
384 | #endif | |
385 | } | |
386 | ||
387 | /* Now, this task is no longer a kernel thread. */ | |
388 | current->thread.current_ds = USER_DS; | |
389 | if (current->thread.flags & SPARC_FLAG_KTHREAD) { | |
390 | current->thread.flags &= ~SPARC_FLAG_KTHREAD; | |
391 | ||
392 | /* We must fixup kregs as well. */ | |
393 | /* XXX This was not fixed for ti for a while, worked. Unused? */ | |
394 | current->thread.kregs = (struct pt_regs *) | |
36483c6b | 395 | (task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ)); |
1da177e4 LT |
396 | } |
397 | } | |
398 | ||
399 | static __inline__ struct sparc_stackf __user * | |
400 | clone_stackframe(struct sparc_stackf __user *dst, | |
401 | struct sparc_stackf __user *src) | |
402 | { | |
403 | unsigned long size, fp; | |
404 | struct sparc_stackf *tmp; | |
405 | struct sparc_stackf __user *sp; | |
406 | ||
407 | if (get_user(tmp, &src->fp)) | |
408 | return NULL; | |
409 | ||
410 | fp = (unsigned long) tmp; | |
411 | size = (fp - ((unsigned long) src)); | |
412 | fp = (unsigned long) dst; | |
413 | sp = (struct sparc_stackf __user *)(fp - size); | |
414 | ||
415 | /* do_fork() grabs the parent semaphore, we must release it | |
416 | * temporarily so we can build the child clone stack frame | |
417 | * without deadlocking. | |
418 | */ | |
419 | if (__copy_user(sp, src, size)) | |
420 | sp = NULL; | |
421 | else if (put_user(fp, &sp->fp)) | |
422 | sp = NULL; | |
423 | ||
424 | return sp; | |
425 | } | |
426 | ||
427 | asmlinkage int sparc_do_fork(unsigned long clone_flags, | |
428 | unsigned long stack_start, | |
429 | struct pt_regs *regs, | |
430 | unsigned long stack_size) | |
431 | { | |
432 | unsigned long parent_tid_ptr, child_tid_ptr; | |
433 | ||
434 | parent_tid_ptr = regs->u_regs[UREG_I2]; | |
435 | child_tid_ptr = regs->u_regs[UREG_I4]; | |
436 | ||
437 | return do_fork(clone_flags, stack_start, | |
438 | regs, stack_size, | |
439 | (int __user *) parent_tid_ptr, | |
440 | (int __user *) child_tid_ptr); | |
441 | } | |
442 | ||
443 | /* Copy a Sparc thread. The fork() return value conventions | |
444 | * under SunOS are nothing short of bletcherous: | |
445 | * Parent --> %o0 == childs pid, %o1 == 0 | |
446 | * Child --> %o0 == parents pid, %o1 == 1 | |
447 | * | |
448 | * NOTE: We have a separate fork kpsr/kwim because | |
449 | * the parent could change these values between | |
450 | * sys_fork invocation and when we reach here | |
451 | * if the parent should sleep while trying to | |
452 | * allocate the task_struct and kernel stack in | |
453 | * do_fork(). | |
454 | * XXX See comment above sys_vfork in sparc64. todo. | |
455 | */ | |
456 | extern void ret_from_fork(void); | |
457 | ||
458 | int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, | |
459 | unsigned long unused, | |
460 | struct task_struct *p, struct pt_regs *regs) | |
461 | { | |
36483c6b | 462 | struct thread_info *ti = task_thread_info(p); |
1da177e4 LT |
463 | struct pt_regs *childregs; |
464 | char *new_stack; | |
465 | ||
466 | #ifndef CONFIG_SMP | |
467 | if(last_task_used_math == current) { | |
468 | #else | |
469 | if(current_thread_info()->flags & _TIF_USEDFPU) { | |
470 | #endif | |
471 | put_psr(get_psr() | PSR_EF); | |
472 | fpsave(&p->thread.float_regs[0], &p->thread.fsr, | |
473 | &p->thread.fpqueue[0], &p->thread.fpqdepth); | |
474 | #ifdef CONFIG_SMP | |
475 | current_thread_info()->flags &= ~_TIF_USEDFPU; | |
476 | #endif | |
477 | } | |
478 | ||
479 | /* | |
480 | * p->thread_info new_stack childregs | |
481 | * ! ! ! {if(PSR_PS) } | |
482 | * V V (stk.fr.) V (pt_regs) { (stk.fr.) } | |
483 | * +----- - - - - - ------+===========+============={+==========}+ | |
484 | */ | |
36483c6b | 485 | new_stack = task_stack_page(p) + THREAD_SIZE; |
1da177e4 LT |
486 | if (regs->psr & PSR_PS) |
487 | new_stack -= STACKFRAME_SZ; | |
488 | new_stack -= STACKFRAME_SZ + TRACEREG_SZ; | |
489 | memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ); | |
490 | childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ); | |
491 | ||
492 | /* | |
493 | * A new process must start with interrupts closed in 2.5, | |
494 | * because this is how Mingo's scheduler works (see schedule_tail | |
495 | * and finish_arch_switch). If we do not do it, a timer interrupt hits | |
496 | * before we unlock, attempts to re-take the rq->lock, and then we die. | |
497 | * Thus, kpsr|=PSR_PIL. | |
498 | */ | |
499 | ti->ksp = (unsigned long) new_stack; | |
500 | ti->kpc = (((unsigned long) ret_from_fork) - 0x8); | |
501 | ti->kpsr = current->thread.fork_kpsr | PSR_PIL; | |
502 | ti->kwim = current->thread.fork_kwim; | |
503 | ||
504 | if(regs->psr & PSR_PS) { | |
505 | extern struct pt_regs fake_swapper_regs; | |
506 | ||
507 | p->thread.kregs = &fake_swapper_regs; | |
508 | new_stack += STACKFRAME_SZ + TRACEREG_SZ; | |
509 | childregs->u_regs[UREG_FP] = (unsigned long) new_stack; | |
510 | p->thread.flags |= SPARC_FLAG_KTHREAD; | |
511 | p->thread.current_ds = KERNEL_DS; | |
512 | memcpy(new_stack, (void *)regs->u_regs[UREG_FP], STACKFRAME_SZ); | |
513 | childregs->u_regs[UREG_G6] = (unsigned long) ti; | |
514 | } else { | |
515 | p->thread.kregs = childregs; | |
516 | childregs->u_regs[UREG_FP] = sp; | |
517 | p->thread.flags &= ~SPARC_FLAG_KTHREAD; | |
518 | p->thread.current_ds = USER_DS; | |
519 | ||
520 | if (sp != regs->u_regs[UREG_FP]) { | |
521 | struct sparc_stackf __user *childstack; | |
522 | struct sparc_stackf __user *parentstack; | |
523 | ||
524 | /* | |
525 | * This is a clone() call with supplied user stack. | |
526 | * Set some valid stack frames to give to the child. | |
527 | */ | |
528 | childstack = (struct sparc_stackf __user *) | |
529 | (sp & ~0x7UL); | |
530 | parentstack = (struct sparc_stackf __user *) | |
531 | regs->u_regs[UREG_FP]; | |
532 | ||
533 | #if 0 | |
534 | printk("clone: parent stack:\n"); | |
535 | show_stackframe(parentstack); | |
536 | #endif | |
537 | ||
538 | childstack = clone_stackframe(childstack, parentstack); | |
539 | if (!childstack) | |
540 | return -EFAULT; | |
541 | ||
542 | #if 0 | |
543 | printk("clone: child stack:\n"); | |
544 | show_stackframe(childstack); | |
545 | #endif | |
546 | ||
547 | childregs->u_regs[UREG_FP] = (unsigned long)childstack; | |
548 | } | |
549 | } | |
550 | ||
551 | #ifdef CONFIG_SMP | |
552 | /* FPU must be disabled on SMP. */ | |
553 | childregs->psr &= ~PSR_EF; | |
554 | #endif | |
555 | ||
556 | /* Set the return value for the child. */ | |
557 | childregs->u_regs[UREG_I0] = current->pid; | |
558 | childregs->u_regs[UREG_I1] = 1; | |
559 | ||
560 | /* Set the return value for the parent. */ | |
561 | regs->u_regs[UREG_I1] = 0; | |
562 | ||
563 | if (clone_flags & CLONE_SETTLS) | |
564 | childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
565 | ||
566 | return 0; | |
567 | } | |
568 | ||
569 | /* | |
570 | * fill in the user structure for a core dump.. | |
571 | */ | |
572 | void dump_thread(struct pt_regs * regs, struct user * dump) | |
573 | { | |
574 | unsigned long first_stack_page; | |
575 | ||
576 | dump->magic = SUNOS_CORE_MAGIC; | |
577 | dump->len = sizeof(struct user); | |
578 | dump->regs.psr = regs->psr; | |
579 | dump->regs.pc = regs->pc; | |
580 | dump->regs.npc = regs->npc; | |
581 | dump->regs.y = regs->y; | |
582 | /* fuck me plenty */ | |
583 | memcpy(&dump->regs.regs[0], ®s->u_regs[1], (sizeof(unsigned long) * 15)); | |
584 | dump->uexec = current->thread.core_exec; | |
585 | dump->u_tsize = (((unsigned long) current->mm->end_code) - | |
586 | ((unsigned long) current->mm->start_code)) & ~(PAGE_SIZE - 1); | |
587 | dump->u_dsize = ((unsigned long) (current->mm->brk + (PAGE_SIZE-1))); | |
588 | dump->u_dsize -= dump->u_tsize; | |
589 | dump->u_dsize &= ~(PAGE_SIZE - 1); | |
590 | first_stack_page = (regs->u_regs[UREG_FP] & ~(PAGE_SIZE - 1)); | |
591 | dump->u_ssize = (TASK_SIZE - first_stack_page) & ~(PAGE_SIZE - 1); | |
592 | memcpy(&dump->fpu.fpstatus.fregs.regs[0], ¤t->thread.float_regs[0], (sizeof(unsigned long) * 32)); | |
593 | dump->fpu.fpstatus.fsr = current->thread.fsr; | |
594 | dump->fpu.fpstatus.flags = dump->fpu.fpstatus.extra = 0; | |
595 | dump->fpu.fpstatus.fpq_count = current->thread.fpqdepth; | |
596 | memcpy(&dump->fpu.fpstatus.fpq[0], ¤t->thread.fpqueue[0], | |
597 | ((sizeof(unsigned long) * 2) * 16)); | |
598 | dump->sigcode = 0; | |
599 | } | |
600 | ||
601 | /* | |
602 | * fill in the fpu structure for a core dump. | |
603 | */ | |
604 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
605 | { | |
606 | if (used_math()) { | |
607 | memset(fpregs, 0, sizeof(*fpregs)); | |
608 | fpregs->pr_q_entrysize = 8; | |
609 | return 1; | |
610 | } | |
611 | #ifdef CONFIG_SMP | |
612 | if (current_thread_info()->flags & _TIF_USEDFPU) { | |
613 | put_psr(get_psr() | PSR_EF); | |
614 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
615 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
616 | if (regs != NULL) { | |
617 | regs->psr &= ~(PSR_EF); | |
618 | current_thread_info()->flags &= ~(_TIF_USEDFPU); | |
619 | } | |
620 | } | |
621 | #else | |
622 | if (current == last_task_used_math) { | |
623 | put_psr(get_psr() | PSR_EF); | |
624 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
625 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
626 | if (regs != NULL) { | |
627 | regs->psr &= ~(PSR_EF); | |
628 | last_task_used_math = NULL; | |
629 | } | |
630 | } | |
631 | #endif | |
632 | memcpy(&fpregs->pr_fr.pr_regs[0], | |
633 | ¤t->thread.float_regs[0], | |
634 | (sizeof(unsigned long) * 32)); | |
635 | fpregs->pr_fsr = current->thread.fsr; | |
636 | fpregs->pr_qcnt = current->thread.fpqdepth; | |
637 | fpregs->pr_q_entrysize = 8; | |
638 | fpregs->pr_en = 1; | |
639 | if(fpregs->pr_qcnt != 0) { | |
640 | memcpy(&fpregs->pr_q[0], | |
641 | ¤t->thread.fpqueue[0], | |
642 | sizeof(struct fpq) * fpregs->pr_qcnt); | |
643 | } | |
644 | /* Zero out the rest. */ | |
645 | memset(&fpregs->pr_q[fpregs->pr_qcnt], 0, | |
646 | sizeof(struct fpq) * (32 - fpregs->pr_qcnt)); | |
647 | return 1; | |
648 | } | |
649 | ||
650 | /* | |
651 | * sparc_execve() executes a new program after the asm stub has set | |
652 | * things up for us. This should basically do what I want it to. | |
653 | */ | |
654 | asmlinkage int sparc_execve(struct pt_regs *regs) | |
655 | { | |
656 | int error, base = 0; | |
657 | char *filename; | |
658 | ||
659 | /* Check for indirect call. */ | |
660 | if(regs->u_regs[UREG_G1] == 0) | |
661 | base = 1; | |
662 | ||
663 | filename = getname((char __user *)regs->u_regs[base + UREG_I0]); | |
664 | error = PTR_ERR(filename); | |
665 | if(IS_ERR(filename)) | |
666 | goto out; | |
667 | error = do_execve(filename, | |
668 | (char __user * __user *)regs->u_regs[base + UREG_I1], | |
669 | (char __user * __user *)regs->u_regs[base + UREG_I2], | |
670 | regs); | |
671 | putname(filename); | |
672 | if (error == 0) { | |
673 | task_lock(current); | |
674 | current->ptrace &= ~PT_DTRACE; | |
675 | task_unlock(current); | |
676 | } | |
677 | out: | |
678 | return error; | |
679 | } | |
680 | ||
681 | /* | |
682 | * This is the mechanism for creating a new kernel thread. | |
683 | * | |
684 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
685 | * who haven't done an "execve()") should use this: it will work within | |
686 | * a system call from a "real" process, but the process memory space will | |
687 | * not be free'd until both the parent and the child have exited. | |
688 | */ | |
689 | pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
690 | { | |
691 | long retval; | |
692 | ||
693 | __asm__ __volatile__("mov %4, %%g2\n\t" /* Set aside fn ptr... */ | |
694 | "mov %5, %%g3\n\t" /* and arg. */ | |
695 | "mov %1, %%g1\n\t" | |
696 | "mov %2, %%o0\n\t" /* Clone flags. */ | |
697 | "mov 0, %%o1\n\t" /* usp arg == 0 */ | |
698 | "t 0x10\n\t" /* Linux/Sparc clone(). */ | |
699 | "cmp %%o1, 0\n\t" | |
700 | "be 1f\n\t" /* The parent, just return. */ | |
701 | " nop\n\t" /* Delay slot. */ | |
702 | "jmpl %%g2, %%o7\n\t" /* Call the function. */ | |
703 | " mov %%g3, %%o0\n\t" /* Get back the arg in delay. */ | |
704 | "mov %3, %%g1\n\t" | |
705 | "t 0x10\n\t" /* Linux/Sparc exit(). */ | |
706 | /* Notreached by child. */ | |
707 | "1: mov %%o0, %0\n\t" : | |
708 | "=r" (retval) : | |
709 | "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), | |
710 | "i" (__NR_exit), "r" (fn), "r" (arg) : | |
711 | "g1", "g2", "g3", "o0", "o1", "memory", "cc"); | |
712 | return retval; | |
713 | } | |
714 | ||
715 | unsigned long get_wchan(struct task_struct *task) | |
716 | { | |
717 | unsigned long pc, fp, bias = 0; | |
718 | unsigned long task_base = (unsigned long) task; | |
719 | unsigned long ret = 0; | |
720 | struct reg_window *rw; | |
721 | int count = 0; | |
722 | ||
723 | if (!task || task == current || | |
724 | task->state == TASK_RUNNING) | |
725 | goto out; | |
726 | ||
d562ef6a | 727 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
728 | do { |
729 | /* Bogus frame pointer? */ | |
730 | if (fp < (task_base + sizeof(struct thread_info)) || | |
731 | fp >= (task_base + (2 * PAGE_SIZE))) | |
732 | break; | |
733 | rw = (struct reg_window *) fp; | |
734 | pc = rw->ins[7]; | |
735 | if (!in_sched_functions(pc)) { | |
736 | ret = pc; | |
737 | goto out; | |
738 | } | |
739 | fp = rw->ins[6] + bias; | |
740 | } while (++count < 16); | |
741 | ||
742 | out: | |
743 | return ret; | |
744 | } | |
745 |