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64d329ee | 1 | /* linux/arch/sparc/kernel/process.c |
1da177e4 | 2 | * |
64d329ee | 3 | * Copyright (C) 1995 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> | |
17 | #include <linux/kallsyms.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/stddef.h> | |
20 | #include <linux/ptrace.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/user.h> | |
1da177e4 | 23 | #include <linux/smp.h> |
1da177e4 LT |
24 | #include <linux/reboot.h> |
25 | #include <linux/delay.h> | |
26 | #include <linux/pm.h> | |
27 | #include <linux/init.h> | |
28 | ||
29 | #include <asm/auxio.h> | |
30 | #include <asm/oplib.h> | |
31 | #include <asm/uaccess.h> | |
32 | #include <asm/system.h> | |
33 | #include <asm/page.h> | |
34 | #include <asm/pgalloc.h> | |
35 | #include <asm/pgtable.h> | |
36 | #include <asm/delay.h> | |
37 | #include <asm/processor.h> | |
38 | #include <asm/psr.h> | |
39 | #include <asm/elf.h> | |
c73fcc84 | 40 | #include <asm/prom.h> |
1da177e4 LT |
41 | #include <asm/unistd.h> |
42 | ||
43 | /* | |
44 | * Power management idle function | |
45 | * Set in pm platform drivers (apc.c and pmc.c) | |
46 | */ | |
47 | void (*pm_idle)(void); | |
48 | ||
49 | /* | |
50 | * Power-off handler instantiation for pm.h compliance | |
51 | * This is done via auxio, but could be used as a fallback | |
52 | * handler when auxio is not present-- unused for now... | |
53 | */ | |
304cd3ef | 54 | void (*pm_power_off)(void) = machine_power_off; |
89eb1693 | 55 | EXPORT_SYMBOL(pm_power_off); |
1da177e4 LT |
56 | |
57 | /* | |
58 | * sysctl - toggle power-off restriction for serial console | |
59 | * systems in machine_power_off() | |
60 | */ | |
61 | int scons_pwroff = 1; | |
62 | ||
63 | extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *); | |
64 | ||
65 | struct task_struct *last_task_used_math = NULL; | |
66 | struct thread_info *current_set[NR_CPUS]; | |
67 | ||
1da177e4 LT |
68 | #ifndef CONFIG_SMP |
69 | ||
70 | #define SUN4C_FAULT_HIGH 100 | |
71 | ||
72 | /* | |
73 | * the idle loop on a Sparc... ;) | |
74 | */ | |
75 | void cpu_idle(void) | |
76 | { | |
1da177e4 LT |
77 | /* endless idle loop with no priority at all */ |
78 | for (;;) { | |
79 | if (ARCH_SUN4C_SUN4) { | |
80 | static int count = HZ; | |
81 | static unsigned long last_jiffies; | |
82 | static unsigned long last_faults; | |
83 | static unsigned long fps; | |
84 | unsigned long now; | |
85 | unsigned long faults; | |
1da177e4 LT |
86 | |
87 | extern unsigned long sun4c_kernel_faults; | |
88 | extern void sun4c_grow_kernel_ring(void); | |
89 | ||
64c7c8f8 | 90 | local_irq_disable(); |
1da177e4 LT |
91 | now = jiffies; |
92 | count -= (now - last_jiffies); | |
93 | last_jiffies = now; | |
94 | if (count < 0) { | |
95 | count += HZ; | |
96 | faults = sun4c_kernel_faults; | |
97 | fps = (fps + (faults - last_faults)) >> 1; | |
98 | last_faults = faults; | |
99 | #if 0 | |
100 | printk("kernel faults / second = %ld\n", fps); | |
101 | #endif | |
102 | if (fps >= SUN4C_FAULT_HIGH) { | |
103 | sun4c_grow_kernel_ring(); | |
104 | } | |
105 | } | |
64c7c8f8 | 106 | local_irq_enable(); |
1da177e4 LT |
107 | } |
108 | ||
64c7c8f8 NP |
109 | if (pm_idle) { |
110 | while (!need_resched()) | |
111 | (*pm_idle)(); | |
112 | } else { | |
113 | while (!need_resched()) | |
114 | cpu_relax(); | |
1da177e4 | 115 | } |
5bfb5d69 | 116 | preempt_enable_no_resched(); |
1da177e4 | 117 | schedule(); |
5bfb5d69 | 118 | preempt_disable(); |
1da177e4 LT |
119 | check_pgt_cache(); |
120 | } | |
1da177e4 LT |
121 | } |
122 | ||
123 | #else | |
124 | ||
125 | /* This is being executed in task 0 'user space'. */ | |
126 | void cpu_idle(void) | |
127 | { | |
64c7c8f8 | 128 | set_thread_flag(TIF_POLLING_NRFLAG); |
1da177e4 LT |
129 | /* endless idle loop with no priority at all */ |
130 | while(1) { | |
64c7c8f8 NP |
131 | while (!need_resched()) |
132 | cpu_relax(); | |
133 | preempt_enable_no_resched(); | |
134 | schedule(); | |
135 | preempt_disable(); | |
136 | check_pgt_cache(); | |
1da177e4 LT |
137 | } |
138 | } | |
139 | ||
140 | #endif | |
141 | ||
1da177e4 LT |
142 | /* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */ |
143 | void machine_halt(void) | |
144 | { | |
145 | local_irq_enable(); | |
146 | mdelay(8); | |
147 | local_irq_disable(); | |
1da177e4 LT |
148 | prom_halt(); |
149 | panic("Halt failed!"); | |
150 | } | |
151 | ||
1da177e4 LT |
152 | void machine_restart(char * cmd) |
153 | { | |
154 | char *p; | |
155 | ||
156 | local_irq_enable(); | |
157 | mdelay(8); | |
158 | local_irq_disable(); | |
159 | ||
160 | p = strchr (reboot_command, '\n'); | |
161 | if (p) *p = 0; | |
1da177e4 LT |
162 | if (cmd) |
163 | prom_reboot(cmd); | |
164 | if (*reboot_command) | |
165 | prom_reboot(reboot_command); | |
166 | prom_feval ("reset"); | |
167 | panic("Reboot failed!"); | |
168 | } | |
169 | ||
1da177e4 LT |
170 | void machine_power_off(void) |
171 | { | |
172 | #ifdef CONFIG_SUN_AUXIO | |
c73fcc84 DM |
173 | if (auxio_power_register && |
174 | (strcmp(of_console_device->type, "serial") || scons_pwroff)) | |
1da177e4 LT |
175 | *auxio_power_register |= AUXIO_POWER_OFF; |
176 | #endif | |
177 | machine_halt(); | |
178 | } | |
179 | ||
1da177e4 LT |
180 | static DEFINE_SPINLOCK(sparc_backtrace_lock); |
181 | ||
182 | void __show_backtrace(unsigned long fp) | |
183 | { | |
184 | struct reg_window *rw; | |
185 | unsigned long flags; | |
186 | int cpu = smp_processor_id(); | |
187 | ||
188 | spin_lock_irqsave(&sparc_backtrace_lock, flags); | |
189 | ||
190 | rw = (struct reg_window *)fp; | |
191 | while(rw && (((unsigned long) rw) >= PAGE_OFFSET) && | |
192 | !(((unsigned long) rw) & 0x7)) { | |
193 | printk("CPU[%d]: ARGS[%08lx,%08lx,%08lx,%08lx,%08lx,%08lx] " | |
194 | "FP[%08lx] CALLER[%08lx]: ", cpu, | |
195 | rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3], | |
196 | rw->ins[4], rw->ins[5], | |
197 | rw->ins[6], | |
198 | rw->ins[7]); | |
199 | print_symbol("%s\n", rw->ins[7]); | |
200 | rw = (struct reg_window *) rw->ins[6]; | |
201 | } | |
202 | spin_unlock_irqrestore(&sparc_backtrace_lock, flags); | |
203 | } | |
204 | ||
205 | #define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t") | |
206 | #define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t") | |
207 | #define __GET_FP(fp) __asm__ __volatile__("mov %%i6, %0" : "=r" (fp)) | |
208 | ||
209 | void show_backtrace(void) | |
210 | { | |
211 | unsigned long fp; | |
212 | ||
213 | __SAVE; __SAVE; __SAVE; __SAVE; | |
214 | __SAVE; __SAVE; __SAVE; __SAVE; | |
215 | __RESTORE; __RESTORE; __RESTORE; __RESTORE; | |
216 | __RESTORE; __RESTORE; __RESTORE; __RESTORE; | |
217 | ||
218 | __GET_FP(fp); | |
219 | ||
220 | __show_backtrace(fp); | |
221 | } | |
222 | ||
223 | #ifdef CONFIG_SMP | |
224 | void smp_show_backtrace_all_cpus(void) | |
225 | { | |
226 | xc0((smpfunc_t) show_backtrace); | |
227 | show_backtrace(); | |
228 | } | |
229 | #endif | |
230 | ||
231 | #if 0 | |
232 | void show_stackframe(struct sparc_stackf *sf) | |
233 | { | |
234 | unsigned long size; | |
235 | unsigned long *stk; | |
236 | int i; | |
237 | ||
238 | printk("l0: %08lx l1: %08lx l2: %08lx l3: %08lx " | |
239 | "l4: %08lx l5: %08lx l6: %08lx l7: %08lx\n", | |
240 | sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3], | |
241 | sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]); | |
242 | printk("i0: %08lx i1: %08lx i2: %08lx i3: %08lx " | |
243 | "i4: %08lx i5: %08lx fp: %08lx i7: %08lx\n", | |
244 | sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3], | |
245 | sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc); | |
246 | printk("sp: %08lx x0: %08lx x1: %08lx x2: %08lx " | |
247 | "x3: %08lx x4: %08lx x5: %08lx xx: %08lx\n", | |
248 | (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1], | |
249 | sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5], | |
250 | sf->xxargs[0]); | |
251 | size = ((unsigned long)sf->fp) - ((unsigned long)sf); | |
252 | size -= STACKFRAME_SZ; | |
253 | stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ); | |
254 | i = 0; | |
255 | do { | |
256 | printk("s%d: %08lx\n", i++, *stk++); | |
257 | } while ((size -= sizeof(unsigned long))); | |
258 | } | |
259 | #endif | |
260 | ||
261 | void show_regs(struct pt_regs *r) | |
262 | { | |
263 | struct reg_window *rw = (struct reg_window *) r->u_regs[14]; | |
264 | ||
265 | printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx %s\n", | |
266 | r->psr, r->pc, r->npc, r->y, print_tainted()); | |
267 | print_symbol("PC: <%s>\n", r->pc); | |
268 | printk("%%G: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
269 | r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3], | |
270 | r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]); | |
271 | printk("%%O: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
272 | r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11], | |
273 | r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]); | |
274 | print_symbol("RPC: <%s>\n", r->u_regs[15]); | |
275 | ||
276 | printk("%%L: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
277 | rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3], | |
278 | rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]); | |
279 | printk("%%I: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
280 | rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3], | |
281 | rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]); | |
282 | } | |
283 | ||
284 | /* | |
285 | * The show_stack is an external API which we do not use ourselves. | |
286 | * The oops is printed in die_if_kernel. | |
287 | */ | |
288 | void show_stack(struct task_struct *tsk, unsigned long *_ksp) | |
289 | { | |
290 | unsigned long pc, fp; | |
291 | unsigned long task_base; | |
292 | struct reg_window *rw; | |
293 | int count = 0; | |
294 | ||
295 | if (tsk != NULL) | |
36483c6b | 296 | task_base = (unsigned long) task_stack_page(tsk); |
1da177e4 LT |
297 | else |
298 | task_base = (unsigned long) current_thread_info(); | |
299 | ||
300 | fp = (unsigned long) _ksp; | |
301 | do { | |
302 | /* Bogus frame pointer? */ | |
303 | if (fp < (task_base + sizeof(struct thread_info)) || | |
304 | fp >= (task_base + (PAGE_SIZE << 1))) | |
305 | break; | |
306 | rw = (struct reg_window *) fp; | |
307 | pc = rw->ins[7]; | |
308 | printk("[%08lx : ", pc); | |
309 | print_symbol("%s ] ", pc); | |
310 | fp = rw->ins[6]; | |
311 | } while (++count < 16); | |
312 | printk("\n"); | |
313 | } | |
314 | ||
24dc6ead TC |
315 | void dump_stack(void) |
316 | { | |
317 | unsigned long *ksp; | |
318 | ||
319 | __asm__ __volatile__("mov %%fp, %0" | |
320 | : "=r" (ksp)); | |
321 | show_stack(current, ksp); | |
322 | } | |
323 | ||
324 | EXPORT_SYMBOL(dump_stack); | |
325 | ||
1da177e4 LT |
326 | /* |
327 | * Note: sparc64 has a pretty intricated thread_saved_pc, check it out. | |
328 | */ | |
329 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
330 | { | |
d562ef6a | 331 | return task_thread_info(tsk)->kpc; |
1da177e4 LT |
332 | } |
333 | ||
334 | /* | |
335 | * Free current thread data structures etc.. | |
336 | */ | |
337 | void exit_thread(void) | |
338 | { | |
339 | #ifndef CONFIG_SMP | |
340 | if(last_task_used_math == current) { | |
341 | #else | |
54f565ea | 342 | if (test_thread_flag(TIF_USEDFPU)) { |
1da177e4 LT |
343 | #endif |
344 | /* Keep process from leaving FPU in a bogon state. */ | |
345 | put_psr(get_psr() | PSR_EF); | |
346 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
347 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
348 | #ifndef CONFIG_SMP | |
349 | last_task_used_math = NULL; | |
350 | #else | |
54f565ea | 351 | clear_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
352 | #endif |
353 | } | |
354 | } | |
355 | ||
356 | void flush_thread(void) | |
357 | { | |
358 | current_thread_info()->w_saved = 0; | |
359 | ||
1da177e4 LT |
360 | #ifndef CONFIG_SMP |
361 | if(last_task_used_math == current) { | |
362 | #else | |
54f565ea | 363 | if (test_thread_flag(TIF_USEDFPU)) { |
1da177e4 LT |
364 | #endif |
365 | /* Clean the fpu. */ | |
366 | put_psr(get_psr() | PSR_EF); | |
367 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
368 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
369 | #ifndef CONFIG_SMP | |
370 | last_task_used_math = NULL; | |
371 | #else | |
54f565ea | 372 | clear_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
373 | #endif |
374 | } | |
375 | ||
376 | /* Now, this task is no longer a kernel thread. */ | |
377 | current->thread.current_ds = USER_DS; | |
378 | if (current->thread.flags & SPARC_FLAG_KTHREAD) { | |
379 | current->thread.flags &= ~SPARC_FLAG_KTHREAD; | |
380 | ||
381 | /* We must fixup kregs as well. */ | |
382 | /* XXX This was not fixed for ti for a while, worked. Unused? */ | |
383 | current->thread.kregs = (struct pt_regs *) | |
36483c6b | 384 | (task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ)); |
1da177e4 LT |
385 | } |
386 | } | |
387 | ||
64d329ee | 388 | static inline struct sparc_stackf __user * |
1da177e4 LT |
389 | clone_stackframe(struct sparc_stackf __user *dst, |
390 | struct sparc_stackf __user *src) | |
391 | { | |
392 | unsigned long size, fp; | |
393 | struct sparc_stackf *tmp; | |
394 | struct sparc_stackf __user *sp; | |
395 | ||
396 | if (get_user(tmp, &src->fp)) | |
397 | return NULL; | |
398 | ||
399 | fp = (unsigned long) tmp; | |
400 | size = (fp - ((unsigned long) src)); | |
401 | fp = (unsigned long) dst; | |
402 | sp = (struct sparc_stackf __user *)(fp - size); | |
403 | ||
404 | /* do_fork() grabs the parent semaphore, we must release it | |
405 | * temporarily so we can build the child clone stack frame | |
406 | * without deadlocking. | |
407 | */ | |
408 | if (__copy_user(sp, src, size)) | |
409 | sp = NULL; | |
410 | else if (put_user(fp, &sp->fp)) | |
411 | sp = NULL; | |
412 | ||
413 | return sp; | |
414 | } | |
415 | ||
416 | asmlinkage int sparc_do_fork(unsigned long clone_flags, | |
417 | unsigned long stack_start, | |
418 | struct pt_regs *regs, | |
419 | unsigned long stack_size) | |
420 | { | |
421 | unsigned long parent_tid_ptr, child_tid_ptr; | |
422 | ||
423 | parent_tid_ptr = regs->u_regs[UREG_I2]; | |
424 | child_tid_ptr = regs->u_regs[UREG_I4]; | |
425 | ||
426 | return do_fork(clone_flags, stack_start, | |
427 | regs, stack_size, | |
428 | (int __user *) parent_tid_ptr, | |
429 | (int __user *) child_tid_ptr); | |
430 | } | |
431 | ||
432 | /* Copy a Sparc thread. The fork() return value conventions | |
433 | * under SunOS are nothing short of bletcherous: | |
434 | * Parent --> %o0 == childs pid, %o1 == 0 | |
435 | * Child --> %o0 == parents pid, %o1 == 1 | |
436 | * | |
437 | * NOTE: We have a separate fork kpsr/kwim because | |
438 | * the parent could change these values between | |
439 | * sys_fork invocation and when we reach here | |
440 | * if the parent should sleep while trying to | |
441 | * allocate the task_struct and kernel stack in | |
442 | * do_fork(). | |
443 | * XXX See comment above sys_vfork in sparc64. todo. | |
444 | */ | |
445 | extern void ret_from_fork(void); | |
446 | ||
447 | int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, | |
448 | unsigned long unused, | |
449 | struct task_struct *p, struct pt_regs *regs) | |
450 | { | |
36483c6b | 451 | struct thread_info *ti = task_thread_info(p); |
1da177e4 LT |
452 | struct pt_regs *childregs; |
453 | char *new_stack; | |
454 | ||
455 | #ifndef CONFIG_SMP | |
456 | if(last_task_used_math == current) { | |
457 | #else | |
54f565ea | 458 | if (test_thread_flag(TIF_USEDFPU)) { |
1da177e4 LT |
459 | #endif |
460 | put_psr(get_psr() | PSR_EF); | |
461 | fpsave(&p->thread.float_regs[0], &p->thread.fsr, | |
462 | &p->thread.fpqueue[0], &p->thread.fpqdepth); | |
463 | #ifdef CONFIG_SMP | |
54f565ea | 464 | clear_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
465 | #endif |
466 | } | |
467 | ||
468 | /* | |
469 | * p->thread_info new_stack childregs | |
470 | * ! ! ! {if(PSR_PS) } | |
471 | * V V (stk.fr.) V (pt_regs) { (stk.fr.) } | |
472 | * +----- - - - - - ------+===========+============={+==========}+ | |
473 | */ | |
36483c6b | 474 | new_stack = task_stack_page(p) + THREAD_SIZE; |
1da177e4 LT |
475 | if (regs->psr & PSR_PS) |
476 | new_stack -= STACKFRAME_SZ; | |
477 | new_stack -= STACKFRAME_SZ + TRACEREG_SZ; | |
478 | memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ); | |
479 | childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ); | |
480 | ||
481 | /* | |
482 | * A new process must start with interrupts closed in 2.5, | |
483 | * because this is how Mingo's scheduler works (see schedule_tail | |
484 | * and finish_arch_switch). If we do not do it, a timer interrupt hits | |
485 | * before we unlock, attempts to re-take the rq->lock, and then we die. | |
486 | * Thus, kpsr|=PSR_PIL. | |
487 | */ | |
488 | ti->ksp = (unsigned long) new_stack; | |
489 | ti->kpc = (((unsigned long) ret_from_fork) - 0x8); | |
490 | ti->kpsr = current->thread.fork_kpsr | PSR_PIL; | |
491 | ti->kwim = current->thread.fork_kwim; | |
492 | ||
493 | if(regs->psr & PSR_PS) { | |
494 | extern struct pt_regs fake_swapper_regs; | |
495 | ||
496 | p->thread.kregs = &fake_swapper_regs; | |
497 | new_stack += STACKFRAME_SZ + TRACEREG_SZ; | |
498 | childregs->u_regs[UREG_FP] = (unsigned long) new_stack; | |
499 | p->thread.flags |= SPARC_FLAG_KTHREAD; | |
500 | p->thread.current_ds = KERNEL_DS; | |
501 | memcpy(new_stack, (void *)regs->u_regs[UREG_FP], STACKFRAME_SZ); | |
502 | childregs->u_regs[UREG_G6] = (unsigned long) ti; | |
503 | } else { | |
504 | p->thread.kregs = childregs; | |
505 | childregs->u_regs[UREG_FP] = sp; | |
506 | p->thread.flags &= ~SPARC_FLAG_KTHREAD; | |
507 | p->thread.current_ds = USER_DS; | |
508 | ||
509 | if (sp != regs->u_regs[UREG_FP]) { | |
510 | struct sparc_stackf __user *childstack; | |
511 | struct sparc_stackf __user *parentstack; | |
512 | ||
513 | /* | |
514 | * This is a clone() call with supplied user stack. | |
515 | * Set some valid stack frames to give to the child. | |
516 | */ | |
517 | childstack = (struct sparc_stackf __user *) | |
518 | (sp & ~0x7UL); | |
519 | parentstack = (struct sparc_stackf __user *) | |
520 | regs->u_regs[UREG_FP]; | |
521 | ||
522 | #if 0 | |
523 | printk("clone: parent stack:\n"); | |
524 | show_stackframe(parentstack); | |
525 | #endif | |
526 | ||
527 | childstack = clone_stackframe(childstack, parentstack); | |
528 | if (!childstack) | |
529 | return -EFAULT; | |
530 | ||
531 | #if 0 | |
532 | printk("clone: child stack:\n"); | |
533 | show_stackframe(childstack); | |
534 | #endif | |
535 | ||
536 | childregs->u_regs[UREG_FP] = (unsigned long)childstack; | |
537 | } | |
538 | } | |
539 | ||
540 | #ifdef CONFIG_SMP | |
541 | /* FPU must be disabled on SMP. */ | |
542 | childregs->psr &= ~PSR_EF; | |
543 | #endif | |
544 | ||
545 | /* Set the return value for the child. */ | |
546 | childregs->u_regs[UREG_I0] = current->pid; | |
547 | childregs->u_regs[UREG_I1] = 1; | |
548 | ||
549 | /* Set the return value for the parent. */ | |
550 | regs->u_regs[UREG_I1] = 0; | |
551 | ||
552 | if (clone_flags & CLONE_SETTLS) | |
553 | childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
1da177e4 LT |
558 | /* |
559 | * fill in the fpu structure for a core dump. | |
560 | */ | |
561 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
562 | { | |
563 | if (used_math()) { | |
564 | memset(fpregs, 0, sizeof(*fpregs)); | |
565 | fpregs->pr_q_entrysize = 8; | |
566 | return 1; | |
567 | } | |
568 | #ifdef CONFIG_SMP | |
54f565ea | 569 | if (test_thread_flag(TIF_USEDFPU)) { |
1da177e4 LT |
570 | put_psr(get_psr() | PSR_EF); |
571 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
572 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
573 | if (regs != NULL) { | |
574 | regs->psr &= ~(PSR_EF); | |
54f565ea | 575 | clear_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
576 | } |
577 | } | |
578 | #else | |
579 | if (current == last_task_used_math) { | |
580 | put_psr(get_psr() | PSR_EF); | |
581 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
582 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
583 | if (regs != NULL) { | |
584 | regs->psr &= ~(PSR_EF); | |
585 | last_task_used_math = NULL; | |
586 | } | |
587 | } | |
588 | #endif | |
589 | memcpy(&fpregs->pr_fr.pr_regs[0], | |
590 | ¤t->thread.float_regs[0], | |
591 | (sizeof(unsigned long) * 32)); | |
592 | fpregs->pr_fsr = current->thread.fsr; | |
593 | fpregs->pr_qcnt = current->thread.fpqdepth; | |
594 | fpregs->pr_q_entrysize = 8; | |
595 | fpregs->pr_en = 1; | |
596 | if(fpregs->pr_qcnt != 0) { | |
597 | memcpy(&fpregs->pr_q[0], | |
598 | ¤t->thread.fpqueue[0], | |
599 | sizeof(struct fpq) * fpregs->pr_qcnt); | |
600 | } | |
601 | /* Zero out the rest. */ | |
602 | memset(&fpregs->pr_q[fpregs->pr_qcnt], 0, | |
603 | sizeof(struct fpq) * (32 - fpregs->pr_qcnt)); | |
604 | return 1; | |
605 | } | |
606 | ||
607 | /* | |
608 | * sparc_execve() executes a new program after the asm stub has set | |
609 | * things up for us. This should basically do what I want it to. | |
610 | */ | |
611 | asmlinkage int sparc_execve(struct pt_regs *regs) | |
612 | { | |
613 | int error, base = 0; | |
614 | char *filename; | |
615 | ||
616 | /* Check for indirect call. */ | |
617 | if(regs->u_regs[UREG_G1] == 0) | |
618 | base = 1; | |
619 | ||
620 | filename = getname((char __user *)regs->u_regs[base + UREG_I0]); | |
621 | error = PTR_ERR(filename); | |
622 | if(IS_ERR(filename)) | |
623 | goto out; | |
624 | error = do_execve(filename, | |
625 | (char __user * __user *)regs->u_regs[base + UREG_I1], | |
626 | (char __user * __user *)regs->u_regs[base + UREG_I2], | |
627 | regs); | |
628 | putname(filename); | |
629 | if (error == 0) { | |
630 | task_lock(current); | |
631 | current->ptrace &= ~PT_DTRACE; | |
632 | task_unlock(current); | |
633 | } | |
634 | out: | |
635 | return error; | |
636 | } | |
637 | ||
638 | /* | |
639 | * This is the mechanism for creating a new kernel thread. | |
640 | * | |
641 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
642 | * who haven't done an "execve()") should use this: it will work within | |
643 | * a system call from a "real" process, but the process memory space will | |
d1a78c32 | 644 | * not be freed until both the parent and the child have exited. |
1da177e4 LT |
645 | */ |
646 | pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
647 | { | |
648 | long retval; | |
649 | ||
650 | __asm__ __volatile__("mov %4, %%g2\n\t" /* Set aside fn ptr... */ | |
651 | "mov %5, %%g3\n\t" /* and arg. */ | |
652 | "mov %1, %%g1\n\t" | |
653 | "mov %2, %%o0\n\t" /* Clone flags. */ | |
654 | "mov 0, %%o1\n\t" /* usp arg == 0 */ | |
655 | "t 0x10\n\t" /* Linux/Sparc clone(). */ | |
656 | "cmp %%o1, 0\n\t" | |
657 | "be 1f\n\t" /* The parent, just return. */ | |
658 | " nop\n\t" /* Delay slot. */ | |
659 | "jmpl %%g2, %%o7\n\t" /* Call the function. */ | |
660 | " mov %%g3, %%o0\n\t" /* Get back the arg in delay. */ | |
661 | "mov %3, %%g1\n\t" | |
662 | "t 0x10\n\t" /* Linux/Sparc exit(). */ | |
663 | /* Notreached by child. */ | |
664 | "1: mov %%o0, %0\n\t" : | |
665 | "=r" (retval) : | |
666 | "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), | |
667 | "i" (__NR_exit), "r" (fn), "r" (arg) : | |
668 | "g1", "g2", "g3", "o0", "o1", "memory", "cc"); | |
669 | return retval; | |
670 | } | |
671 | ||
672 | unsigned long get_wchan(struct task_struct *task) | |
673 | { | |
674 | unsigned long pc, fp, bias = 0; | |
675 | unsigned long task_base = (unsigned long) task; | |
676 | unsigned long ret = 0; | |
677 | struct reg_window *rw; | |
678 | int count = 0; | |
679 | ||
680 | if (!task || task == current || | |
681 | task->state == TASK_RUNNING) | |
682 | goto out; | |
683 | ||
d562ef6a | 684 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
685 | do { |
686 | /* Bogus frame pointer? */ | |
687 | if (fp < (task_base + sizeof(struct thread_info)) || | |
688 | fp >= (task_base + (2 * PAGE_SIZE))) | |
689 | break; | |
690 | rw = (struct reg_window *) fp; | |
691 | pc = rw->ins[7]; | |
692 | if (!in_sched_functions(pc)) { | |
693 | ret = pc; | |
694 | goto out; | |
695 | } | |
696 | fp = rw->ins[6] + bias; | |
697 | } while (++count < 16); | |
698 | ||
699 | out: | |
700 | return ret; | |
701 | } | |
702 |