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[PATCH] kobject: don't oops on null kobject.name
[linux-2.6/mini2440.git] / arch / sparc64 / kernel / process.c
blob059b0d0252245800bf415110644a659a9f6c5a8e
1 /* $Id: process.c,v 1.131 2002/02/09 19:49:30 davem Exp $
2 * arch/sparc64/kernel/process.c
3 *
4 * Copyright (C) 1995, 1996 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
6 * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 */
8
9 /*
10 * This file handles the architecture-dependent parts of process handling..
11 */
12
13 #include <stdarg.h>
14
15 #include <linux/config.h>
16 #include <linux/errno.h>
17 #include <linux/module.h>
18 #include <linux/sched.h>
19 #include <linux/kernel.h>
20 #include <linux/kallsyms.h>
21 #include <linux/mm.h>
22 #include <linux/smp.h>
23 #include <linux/smp_lock.h>
24 #include <linux/stddef.h>
25 #include <linux/ptrace.h>
26 #include <linux/slab.h>
27 #include <linux/user.h>
28 #include <linux/a.out.h>
29 #include <linux/config.h>
30 #include <linux/reboot.h>
31 #include <linux/delay.h>
32 #include <linux/compat.h>
33 #include <linux/init.h>
34
35 #include <asm/oplib.h>
36 #include <asm/uaccess.h>
37 #include <asm/system.h>
38 #include <asm/page.h>
39 #include <asm/pgalloc.h>
40 #include <asm/pgtable.h>
41 #include <asm/processor.h>
42 #include <asm/pstate.h>
43 #include <asm/elf.h>
44 #include <asm/fpumacro.h>
45 #include <asm/head.h>
46 #include <asm/cpudata.h>
47 #include <asm/unistd.h>
48
49 /* #define VERBOSE_SHOWREGS */
50
51 /*
52 * Nothing special yet...
53 */
54 void default_idle(void)
55 {
56 }
57
58 #ifndef CONFIG_SMP
59
60 /*
61 * the idle loop on a Sparc... ;)
62 */
63 void cpu_idle(void)
64 {
65 /* endless idle loop with no priority at all */
66 for (;;) {
67 /* If current->work.need_resched is zero we should really
68 * setup for a system wakup event and execute a shutdown
69 * instruction.
70 *
71 * But this requires writing back the contents of the
72 * L2 cache etc. so implement this later. -DaveM
73 */
74 while (!need_resched())
75 barrier();
76
77 preempt_enable_no_resched();
78 schedule();
79 preempt_disable();
80 check_pgt_cache();
81 }
82 }
83
84 #else
85
86 /*
87 * the idle loop on a UltraMultiPenguin...
88 *
89 * TIF_POLLING_NRFLAG is set because we do not sleep the cpu
90 * inside of the idler task, so an interrupt is not needed
91 * to get a clean fast response.
92 *
93 * XXX Reverify this assumption... -DaveM
94 *
95 * Addendum: We do want it to do something for the signal
96 * delivery case, we detect that by just seeing
97 * if we are trying to send this to an idler or not.
98 */
99 void cpu_idle(void)
100 {
101 cpuinfo_sparc *cpuinfo = &local_cpu_data();
102 set_thread_flag(TIF_POLLING_NRFLAG);
103
104 while(1) {
105 if (need_resched()) {
106 cpuinfo->idle_volume = 0;
107 preempt_enable_no_resched();
108 schedule();
109 preempt_disable();
110 check_pgt_cache();
111 }
112 cpuinfo->idle_volume++;
113
114 /* The store ordering is so that IRQ handlers on
115 * other cpus see our increasing idleness for the buddy
116 * redistribution algorithm. -DaveM
117 */
118 membar_storeload_storestore();
119 }
120 }
121
122 #endif
123
124 extern char reboot_command [];
125
126 extern void (*prom_palette)(int);
127 extern void (*prom_keyboard)(void);
128
129 void machine_halt(void)
130 {
131 if (!serial_console && prom_palette)
132 prom_palette (1);
133 if (prom_keyboard)
134 prom_keyboard();
135 prom_halt();
136 panic("Halt failed!");
137 }
138
139 void machine_alt_power_off(void)
140 {
141 if (!serial_console && prom_palette)
142 prom_palette(1);
143 if (prom_keyboard)
144 prom_keyboard();
145 prom_halt_power_off();
146 panic("Power-off failed!");
147 }
148
149 void machine_restart(char * cmd)
150 {
151 char *p;
152
153 p = strchr (reboot_command, '\n');
154 if (p) *p = 0;
155 if (!serial_console && prom_palette)
156 prom_palette (1);
157 if (prom_keyboard)
158 prom_keyboard();
159 if (cmd)
160 prom_reboot(cmd);
161 if (*reboot_command)
162 prom_reboot(reboot_command);
163 prom_reboot("");
164 panic("Reboot failed!");
165 }
166
167 #ifdef CONFIG_COMPAT
168 static void show_regwindow32(struct pt_regs *regs)
169 {
170 struct reg_window32 __user *rw;
171 struct reg_window32 r_w;
172 mm_segment_t old_fs;
173
174 __asm__ __volatile__ ("flushw");
175 rw = compat_ptr((unsigned)regs->u_regs[14]);
176 old_fs = get_fs();
177 set_fs (USER_DS);
178 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
179 set_fs (old_fs);
180 return;
181 }
182
183 set_fs (old_fs);
184 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
185 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
186 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
187 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
188 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
189 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
190 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
191 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
192 }
193 #else
194 #define show_regwindow32(regs) do { } while (0)
195 #endif
196
197 static void show_regwindow(struct pt_regs *regs)
198 {
199 struct reg_window __user *rw;
200 struct reg_window *rwk;
201 struct reg_window r_w;
202 mm_segment_t old_fs;
203
204 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
205 __asm__ __volatile__ ("flushw");
206 rw = (struct reg_window __user *)
207 (regs->u_regs[14] + STACK_BIAS);
208 rwk = (struct reg_window *)
209 (regs->u_regs[14] + STACK_BIAS);
210 if (!(regs->tstate & TSTATE_PRIV)) {
211 old_fs = get_fs();
212 set_fs (USER_DS);
213 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
214 set_fs (old_fs);
215 return;
216 }
217 rwk = &r_w;
218 set_fs (old_fs);
219 }
220 } else {
221 show_regwindow32(regs);
222 return;
223 }
224 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
225 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
226 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
227 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
228 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
229 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
230 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
231 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
232 if (regs->tstate & TSTATE_PRIV)
233 print_symbol("I7: <%s>\n", rwk->ins[7]);
234 }
235
236 void show_stackframe(struct sparc_stackf *sf)
237 {
238 unsigned long size;
239 unsigned long *stk;
240 int i;
241
242 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n"
243 "l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
244 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3],
245 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
246 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n"
247 "i4: %016lx i5: %016lx fp: %016lx ret_pc: %016lx\n",
248 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3],
249 sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc);
250 printk("sp: %016lx x0: %016lx x1: %016lx x2: %016lx\n"
251 "x3: %016lx x4: %016lx x5: %016lx xx: %016lx\n",
252 (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1],
253 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
254 sf->xxargs[0]);
255 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
256 size -= STACKFRAME_SZ;
257 stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ);
258 i = 0;
259 do {
260 printk("s%d: %016lx\n", i++, *stk++);
261 } while ((size -= sizeof(unsigned long)));
262 }
263
264 void show_stackframe32(struct sparc_stackf32 *sf)
265 {
266 unsigned long size;
267 unsigned *stk;
268 int i;
269
270 printk("l0: %08x l1: %08x l2: %08x l3: %08x\n",
271 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3]);
272 printk("l4: %08x l5: %08x l6: %08x l7: %08x\n",
273 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
274 printk("i0: %08x i1: %08x i2: %08x i3: %08x\n",
275 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3]);
276 printk("i4: %08x i5: %08x fp: %08x ret_pc: %08x\n",
277 sf->ins[4], sf->ins[5], sf->fp, sf->callers_pc);
278 printk("sp: %08x x0: %08x x1: %08x x2: %08x\n"
279 "x3: %08x x4: %08x x5: %08x xx: %08x\n",
280 sf->structptr, sf->xargs[0], sf->xargs[1],
281 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
282 sf->xxargs[0]);
283 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
284 size -= STACKFRAME32_SZ;
285 stk = (unsigned *)((unsigned long)sf + STACKFRAME32_SZ);
286 i = 0;
287 do {
288 printk("s%d: %08x\n", i++, *stk++);
289 } while ((size -= sizeof(unsigned)));
290 }
291
292 #ifdef CONFIG_SMP
293 static DEFINE_SPINLOCK(regdump_lock);
294 #endif
295
296 void __show_regs(struct pt_regs * regs)
297 {
298 #ifdef CONFIG_SMP
299 unsigned long flags;
300
301 /* Protect against xcall ipis which might lead to livelock on the lock */
302 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
303 "wrpr %0, %1, %%pstate"
304 : "=r" (flags)
305 : "i" (PSTATE_IE));
306 spin_lock(&regdump_lock);
307 #endif
308 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
309 regs->tpc, regs->tnpc, regs->y, print_tainted());
310 print_symbol("TPC: <%s>\n", regs->tpc);
311 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
312 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
313 regs->u_regs[3]);
314 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
315 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
316 regs->u_regs[7]);
317 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
318 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
319 regs->u_regs[11]);
320 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
321 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
322 regs->u_regs[15]);
323 print_symbol("RPC: <%s>\n", regs->u_regs[15]);
324 show_regwindow(regs);
325 #ifdef CONFIG_SMP
326 spin_unlock(&regdump_lock);
327 __asm__ __volatile__("wrpr %0, 0, %%pstate"
328 : : "r" (flags));
329 #endif
330 }
331
332 #ifdef VERBOSE_SHOWREGS
333 static void idump_from_user (unsigned int *pc)
334 {
335 int i;
336 int code;
337
338 if((((unsigned long) pc) & 3))
339 return;
340
341 pc -= 3;
342 for(i = -3; i < 6; i++) {
343 get_user(code, pc);
344 printk("%c%08x%c",i?' ':'<',code,i?' ':'>');
345 pc++;
346 }
347 printk("\n");
348 }
349 #endif
350
351 void show_regs(struct pt_regs *regs)
352 {
353 #ifdef VERBOSE_SHOWREGS
354 extern long etrap, etraptl1;
355 #endif
356 __show_regs(regs);
357 #ifdef CONFIG_SMP
358 {
359 extern void smp_report_regs(void);
360
361 smp_report_regs();
362 }
363 #endif
364
365 #ifdef VERBOSE_SHOWREGS
366 if (regs->tpc >= &etrap && regs->tpc < &etraptl1 &&
367 regs->u_regs[14] >= (long)current - PAGE_SIZE &&
368 regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) {
369 printk ("*********parent**********\n");
370 __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF));
371 idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc);
372 printk ("*********endpar**********\n");
373 }
374 #endif
375 }
376
377 void show_regs32(struct pt_regs32 *regs)
378 {
379 printk("PSR: %08x PC: %08x NPC: %08x Y: %08x %s\n", regs->psr,
380 regs->pc, regs->npc, regs->y, print_tainted());
381 printk("g0: %08x g1: %08x g2: %08x g3: %08x ",
382 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
383 regs->u_regs[3]);
384 printk("g4: %08x g5: %08x g6: %08x g7: %08x\n",
385 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
386 regs->u_regs[7]);
387 printk("o0: %08x o1: %08x o2: %08x o3: %08x ",
388 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
389 regs->u_regs[11]);
390 printk("o4: %08x o5: %08x sp: %08x ret_pc: %08x\n",
391 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
392 regs->u_regs[15]);
393 }
394
395 unsigned long thread_saved_pc(struct task_struct *tsk)
396 {
397 struct thread_info *ti = task_thread_info(tsk);
398 unsigned long ret = 0xdeadbeefUL;
399
400 if (ti && ti->ksp) {
401 unsigned long *sp;
402 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
403 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
404 sp[14]) {
405 unsigned long *fp;
406 fp = (unsigned long *)(sp[14] + STACK_BIAS);
407 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
408 ret = fp[15];
409 }
410 }
411 return ret;
412 }
413
414 /* Free current thread data structures etc.. */
415 void exit_thread(void)
416 {
417 struct thread_info *t = current_thread_info();
418
419 if (t->utraps) {
420 if (t->utraps[0] < 2)
421 kfree (t->utraps);
422 else
423 t->utraps[0]--;
424 }
425
426 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
427 t->user_cntd0 = t->user_cntd1 = NULL;
428 t->pcr_reg = 0;
429 write_pcr(0);
430 }
431 }
432
433 void flush_thread(void)
434 {
435 struct thread_info *t = current_thread_info();
436
437 if (t->flags & _TIF_ABI_PENDING)
438 t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT);
439
440 if (t->task->mm) {
441 unsigned long pgd_cache = 0UL;
442 if (test_thread_flag(TIF_32BIT)) {
443 struct mm_struct *mm = t->task->mm;
444 pgd_t *pgd0 = &mm->pgd[0];
445 pud_t *pud0 = pud_offset(pgd0, 0);
446
447 if (pud_none(*pud0)) {
448 pmd_t *page = pmd_alloc_one(mm, 0);
449 pud_set(pud0, page);
450 }
451 pgd_cache = get_pgd_cache(pgd0);
452 }
453 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
454 "membar #Sync"
455 : /* no outputs */
456 : "r" (pgd_cache),
457 "r" (TSB_REG),
458 "i" (ASI_DMMU));
459 }
460 set_thread_wsaved(0);
461
462 /* Turn off performance counters if on. */
463 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
464 t->user_cntd0 = t->user_cntd1 = NULL;
465 t->pcr_reg = 0;
466 write_pcr(0);
467 }
468
469 /* Clear FPU register state. */
470 t->fpsaved[0] = 0;
471
472 if (get_thread_current_ds() != ASI_AIUS)
473 set_fs(USER_DS);
474
475 /* Init new signal delivery disposition. */
476 clear_thread_flag(TIF_NEWSIGNALS);
477 }
478
479 /* It's a bit more tricky when 64-bit tasks are involved... */
480 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
481 {
482 unsigned long fp, distance, rval;
483
484 if (!(test_thread_flag(TIF_32BIT))) {
485 csp += STACK_BIAS;
486 psp += STACK_BIAS;
487 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
488 fp += STACK_BIAS;
489 } else
490 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
491
492 /* Now 8-byte align the stack as this is mandatory in the
493 * Sparc ABI due to how register windows work. This hides
494 * the restriction from thread libraries etc. -DaveM
495 */
496 csp &= ~7UL;
497
498 distance = fp - psp;
499 rval = (csp - distance);
500 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
501 rval = 0;
502 else if (test_thread_flag(TIF_32BIT)) {
503 if (put_user(((u32)csp),
504 &(((struct reg_window32 __user *)rval)->ins[6])))
505 rval = 0;
506 } else {
507 if (put_user(((u64)csp - STACK_BIAS),
508 &(((struct reg_window __user *)rval)->ins[6])))
509 rval = 0;
510 else
511 rval = rval - STACK_BIAS;
512 }
513
514 return rval;
515 }
516
517 /* Standard stuff. */
518 static inline void shift_window_buffer(int first_win, int last_win,
519 struct thread_info *t)
520 {
521 int i;
522
523 for (i = first_win; i < last_win; i++) {
524 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
525 memcpy(&t->reg_window[i], &t->reg_window[i+1],
526 sizeof(struct reg_window));
527 }
528 }
529
530 void synchronize_user_stack(void)
531 {
532 struct thread_info *t = current_thread_info();
533 unsigned long window;
534
535 flush_user_windows();
536 if ((window = get_thread_wsaved()) != 0) {
537 int winsize = sizeof(struct reg_window);
538 int bias = 0;
539
540 if (test_thread_flag(TIF_32BIT))
541 winsize = sizeof(struct reg_window32);
542 else
543 bias = STACK_BIAS;
544
545 window -= 1;
546 do {
547 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
548 struct reg_window *rwin = &t->reg_window[window];
549
550 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
551 shift_window_buffer(window, get_thread_wsaved() - 1, t);
552 set_thread_wsaved(get_thread_wsaved() - 1);
553 }
554 } while (window--);
555 }
556 }
557
558 void fault_in_user_windows(void)
559 {
560 struct thread_info *t = current_thread_info();
561 unsigned long window;
562 int winsize = sizeof(struct reg_window);
563 int bias = 0;
564
565 if (test_thread_flag(TIF_32BIT))
566 winsize = sizeof(struct reg_window32);
567 else
568 bias = STACK_BIAS;
569
570 flush_user_windows();
571 window = get_thread_wsaved();
572
573 if (window != 0) {
574 window -= 1;
575 do {
576 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
577 struct reg_window *rwin = &t->reg_window[window];
578
579 if (copy_to_user((char __user *)sp, rwin, winsize))
580 goto barf;
581 } while (window--);
582 }
583 set_thread_wsaved(0);
584 return;
585
586 barf:
587 set_thread_wsaved(window + 1);
588 do_exit(SIGILL);
589 }
590
591 asmlinkage long sparc_do_fork(unsigned long clone_flags,
592 unsigned long stack_start,
593 struct pt_regs *regs,
594 unsigned long stack_size)
595 {
596 int __user *parent_tid_ptr, *child_tid_ptr;
597
598 #ifdef CONFIG_COMPAT
599 if (test_thread_flag(TIF_32BIT)) {
600 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
601 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
602 } else
603 #endif
604 {
605 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
606 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
607 }
608
609 return do_fork(clone_flags, stack_start,
610 regs, stack_size,
611 parent_tid_ptr, child_tid_ptr);
612 }
613
614 /* Copy a Sparc thread. The fork() return value conventions
615 * under SunOS are nothing short of bletcherous:
616 * Parent --> %o0 == childs pid, %o1 == 0
617 * Child --> %o0 == parents pid, %o1 == 1
618 */
619 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
620 unsigned long unused,
621 struct task_struct *p, struct pt_regs *regs)
622 {
623 struct thread_info *t = task_thread_info(p);
624 char *child_trap_frame;
625
626 /* Calculate offset to stack_frame & pt_regs */
627 child_trap_frame = task_stack_page(p) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ));
628 memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ));
629
630 t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
631 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
632 t->new_child = 1;
633 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
634 t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf));
635 t->fpsaved[0] = 0;
636
637 if (regs->tstate & TSTATE_PRIV) {
638 /* Special case, if we are spawning a kernel thread from
639 * a userspace task (via KMOD, NFS, or similar) we must
640 * disable performance counters in the child because the
641 * address space and protection realm are changing.
642 */
643 if (t->flags & _TIF_PERFCTR) {
644 t->user_cntd0 = t->user_cntd1 = NULL;
645 t->pcr_reg = 0;
646 t->flags &= ~_TIF_PERFCTR;
647 }
648 t->kregs->u_regs[UREG_FP] = t->ksp;
649 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
650 flush_register_windows();
651 memcpy((void *)(t->ksp + STACK_BIAS),
652 (void *)(regs->u_regs[UREG_FP] + STACK_BIAS),
653 sizeof(struct sparc_stackf));
654 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
655 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
656 } else {
657 if (t->flags & _TIF_32BIT) {
658 sp &= 0x00000000ffffffffUL;
659 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
660 }
661 t->kregs->u_regs[UREG_FP] = sp;
662 t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
663 if (sp != regs->u_regs[UREG_FP]) {
664 unsigned long csp;
665
666 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
667 if (!csp)
668 return -EFAULT;
669 t->kregs->u_regs[UREG_FP] = csp;
670 }
671 if (t->utraps)
672 t->utraps[0]++;
673 }
674
675 /* Set the return value for the child. */
676 t->kregs->u_regs[UREG_I0] = current->pid;
677 t->kregs->u_regs[UREG_I1] = 1;
678
679 /* Set the second return value for the parent. */
680 regs->u_regs[UREG_I1] = 0;
681
682 if (clone_flags & CLONE_SETTLS)
683 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
684
685 return 0;
686 }
687
688 /*
689 * This is the mechanism for creating a new kernel thread.
690 *
691 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
692 * who haven't done an "execve()") should use this: it will work within
693 * a system call from a "real" process, but the process memory space will
694 * not be free'd until both the parent and the child have exited.
695 */
696 pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
697 {
698 long retval;
699
700 /* If the parent runs before fn(arg) is called by the child,
701 * the input registers of this function can be clobbered.
702 * So we stash 'fn' and 'arg' into global registers which
703 * will not be modified by the parent.
704 */
705 __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
706 "mov %5, %%g3\n\t" /* Save ARG into global */
707 "mov %1, %%g1\n\t" /* Clone syscall nr. */
708 "mov %2, %%o0\n\t" /* Clone flags. */
709 "mov 0, %%o1\n\t" /* usp arg == 0 */
710 "t 0x6d\n\t" /* Linux/Sparc clone(). */
711 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
712 " mov %%o0, %0\n\t"
713 "jmpl %%g2, %%o7\n\t" /* Call the function. */
714 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
715 "mov %3, %%g1\n\t"
716 "t 0x6d\n\t" /* Linux/Sparc exit(). */
717 /* Notreached by child. */
718 "1:" :
719 "=r" (retval) :
720 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
721 "i" (__NR_exit), "r" (fn), "r" (arg) :
722 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
723 return retval;
724 }
725
726 /*
727 * fill in the user structure for a core dump..
728 */
729 void dump_thread(struct pt_regs * regs, struct user * dump)
730 {
731 /* Only should be used for SunOS and ancient a.out
732 * SparcLinux binaries... Not worth implementing.
733 */
734 memset(dump, 0, sizeof(struct user));
735 }
736
737 typedef struct {
738 union {
739 unsigned int pr_regs[32];
740 unsigned long pr_dregs[16];
741 } pr_fr;
742 unsigned int __unused;
743 unsigned int pr_fsr;
744 unsigned char pr_qcnt;
745 unsigned char pr_q_entrysize;
746 unsigned char pr_en;
747 unsigned int pr_q[64];
748 } elf_fpregset_t32;
749
750 /*
751 * fill in the fpu structure for a core dump.
752 */
753 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
754 {
755 unsigned long *kfpregs = current_thread_info()->fpregs;
756 unsigned long fprs = current_thread_info()->fpsaved[0];
757
758 if (test_thread_flag(TIF_32BIT)) {
759 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
760
761 if (fprs & FPRS_DL)
762 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
763 sizeof(unsigned int) * 32);
764 else
765 memset(&fpregs32->pr_fr.pr_regs[0], 0,
766 sizeof(unsigned int) * 32);
767 fpregs32->pr_qcnt = 0;
768 fpregs32->pr_q_entrysize = 8;
769 memset(&fpregs32->pr_q[0], 0,
770 (sizeof(unsigned int) * 64));
771 if (fprs & FPRS_FEF) {
772 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
773 fpregs32->pr_en = 1;
774 } else {
775 fpregs32->pr_fsr = 0;
776 fpregs32->pr_en = 0;
777 }
778 } else {
779 if(fprs & FPRS_DL)
780 memcpy(&fpregs->pr_regs[0], kfpregs,
781 sizeof(unsigned int) * 32);
782 else
783 memset(&fpregs->pr_regs[0], 0,
784 sizeof(unsigned int) * 32);
785 if(fprs & FPRS_DU)
786 memcpy(&fpregs->pr_regs[16], kfpregs+16,
787 sizeof(unsigned int) * 32);
788 else
789 memset(&fpregs->pr_regs[16], 0,
790 sizeof(unsigned int) * 32);
791 if(fprs & FPRS_FEF) {
792 fpregs->pr_fsr = current_thread_info()->xfsr[0];
793 fpregs->pr_gsr = current_thread_info()->gsr[0];
794 } else {
795 fpregs->pr_fsr = fpregs->pr_gsr = 0;
796 }
797 fpregs->pr_fprs = fprs;
798 }
799 return 1;
800 }
801
802 /*
803 * sparc_execve() executes a new program after the asm stub has set
804 * things up for us. This should basically do what I want it to.
805 */
806 asmlinkage int sparc_execve(struct pt_regs *regs)
807 {
808 int error, base = 0;
809 char *filename;
810
811 /* User register window flush is done by entry.S */
812
813 /* Check for indirect call. */
814 if (regs->u_regs[UREG_G1] == 0)
815 base = 1;
816
817 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
818 error = PTR_ERR(filename);
819 if (IS_ERR(filename))
820 goto out;
821 error = do_execve(filename,
822 (char __user * __user *)
823 regs->u_regs[base + UREG_I1],
824 (char __user * __user *)
825 regs->u_regs[base + UREG_I2], regs);
826 putname(filename);
827 if (!error) {
828 fprs_write(0);
829 current_thread_info()->xfsr[0] = 0;
830 current_thread_info()->fpsaved[0] = 0;
831 regs->tstate &= ~TSTATE_PEF;
832 task_lock(current);
833 current->ptrace &= ~PT_DTRACE;
834 task_unlock(current);
835 }
836 out:
837 return error;
838 }
839
840 unsigned long get_wchan(struct task_struct *task)
841 {
842 unsigned long pc, fp, bias = 0;
843 unsigned long thread_info_base;
844 struct reg_window *rw;
845 unsigned long ret = 0;
846 int count = 0;
847
848 if (!task || task == current ||
849 task->state == TASK_RUNNING)
850 goto out;
851
852 thread_info_base = (unsigned long) task_stack_page(task);
853 bias = STACK_BIAS;
854 fp = task_thread_info(task)->ksp + bias;
855
856 do {
857 /* Bogus frame pointer? */
858 if (fp < (thread_info_base + sizeof(struct thread_info)) ||
859 fp >= (thread_info_base + THREAD_SIZE))
860 break;
861 rw = (struct reg_window *) fp;
862 pc = rw->ins[7];
863 if (!in_sched_functions(pc)) {
864 ret = pc;
865 goto out;
866 }
867 fp = rw->ins[6] + bias;
868 } while (++count < 16);
869
870 out:
871 return ret;
872 }
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