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[PATCH] sched: disable preempt in idle tasks
[linux-2.6/btrfs-unstable.git] / arch / sparc64 / kernel / process.c
blob2f89206e008f86e7f1b53f665d115e31cc194fd2
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 #define idle_me_harder() (cpu_data(smp_processor_id()).idle_volume += 1)
90 #define unidle_me() (cpu_data(smp_processor_id()).idle_volume = 0)
91 void cpu_idle(void)
92 {
93 set_thread_flag(TIF_POLLING_NRFLAG);
94 while(1) {
95 if (need_resched()) {
96 unidle_me();
97 clear_thread_flag(TIF_POLLING_NRFLAG);
98 preempt_enable_no_resched();
99 schedule();
100 preempt_disable();
101 set_thread_flag(TIF_POLLING_NRFLAG);
102 check_pgt_cache();
103 }
104 idle_me_harder();
105
106 /* The store ordering is so that IRQ handlers on
107 * other cpus see our increasing idleness for the buddy
108 * redistribution algorithm. -DaveM
109 */
110 membar_storeload_storestore();
111 }
112 }
113
114 #endif
115
116 extern char reboot_command [];
117
118 extern void (*prom_palette)(int);
119 extern void (*prom_keyboard)(void);
120
121 void machine_halt(void)
122 {
123 if (!serial_console && prom_palette)
124 prom_palette (1);
125 if (prom_keyboard)
126 prom_keyboard();
127 prom_halt();
128 panic("Halt failed!");
129 }
130
131 void machine_alt_power_off(void)
132 {
133 if (!serial_console && prom_palette)
134 prom_palette(1);
135 if (prom_keyboard)
136 prom_keyboard();
137 prom_halt_power_off();
138 panic("Power-off failed!");
139 }
140
141 void machine_restart(char * cmd)
142 {
143 char *p;
144
145 p = strchr (reboot_command, '\n');
146 if (p) *p = 0;
147 if (!serial_console && prom_palette)
148 prom_palette (1);
149 if (prom_keyboard)
150 prom_keyboard();
151 if (cmd)
152 prom_reboot(cmd);
153 if (*reboot_command)
154 prom_reboot(reboot_command);
155 prom_reboot("");
156 panic("Reboot failed!");
157 }
158
159 static void show_regwindow32(struct pt_regs *regs)
160 {
161 struct reg_window32 __user *rw;
162 struct reg_window32 r_w;
163 mm_segment_t old_fs;
164
165 __asm__ __volatile__ ("flushw");
166 rw = compat_ptr((unsigned)regs->u_regs[14]);
167 old_fs = get_fs();
168 set_fs (USER_DS);
169 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
170 set_fs (old_fs);
171 return;
172 }
173
174 set_fs (old_fs);
175 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
176 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
177 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
178 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
179 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
180 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
181 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
182 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
183 }
184
185 static void show_regwindow(struct pt_regs *regs)
186 {
187 struct reg_window __user *rw;
188 struct reg_window *rwk;
189 struct reg_window r_w;
190 mm_segment_t old_fs;
191
192 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
193 __asm__ __volatile__ ("flushw");
194 rw = (struct reg_window __user *)
195 (regs->u_regs[14] + STACK_BIAS);
196 rwk = (struct reg_window *)
197 (regs->u_regs[14] + STACK_BIAS);
198 if (!(regs->tstate & TSTATE_PRIV)) {
199 old_fs = get_fs();
200 set_fs (USER_DS);
201 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
202 set_fs (old_fs);
203 return;
204 }
205 rwk = &r_w;
206 set_fs (old_fs);
207 }
208 } else {
209 show_regwindow32(regs);
210 return;
211 }
212 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
213 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
214 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
215 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
216 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
217 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
218 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
219 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
220 if (regs->tstate & TSTATE_PRIV)
221 print_symbol("I7: <%s>\n", rwk->ins[7]);
222 }
223
224 void show_stackframe(struct sparc_stackf *sf)
225 {
226 unsigned long size;
227 unsigned long *stk;
228 int i;
229
230 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n"
231 "l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
232 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3],
233 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
234 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n"
235 "i4: %016lx i5: %016lx fp: %016lx ret_pc: %016lx\n",
236 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3],
237 sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc);
238 printk("sp: %016lx x0: %016lx x1: %016lx x2: %016lx\n"
239 "x3: %016lx x4: %016lx x5: %016lx xx: %016lx\n",
240 (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1],
241 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
242 sf->xxargs[0]);
243 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
244 size -= STACKFRAME_SZ;
245 stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ);
246 i = 0;
247 do {
248 printk("s%d: %016lx\n", i++, *stk++);
249 } while ((size -= sizeof(unsigned long)));
250 }
251
252 void show_stackframe32(struct sparc_stackf32 *sf)
253 {
254 unsigned long size;
255 unsigned *stk;
256 int i;
257
258 printk("l0: %08x l1: %08x l2: %08x l3: %08x\n",
259 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3]);
260 printk("l4: %08x l5: %08x l6: %08x l7: %08x\n",
261 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
262 printk("i0: %08x i1: %08x i2: %08x i3: %08x\n",
263 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3]);
264 printk("i4: %08x i5: %08x fp: %08x ret_pc: %08x\n",
265 sf->ins[4], sf->ins[5], sf->fp, sf->callers_pc);
266 printk("sp: %08x x0: %08x x1: %08x x2: %08x\n"
267 "x3: %08x x4: %08x x5: %08x xx: %08x\n",
268 sf->structptr, sf->xargs[0], sf->xargs[1],
269 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
270 sf->xxargs[0]);
271 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
272 size -= STACKFRAME32_SZ;
273 stk = (unsigned *)((unsigned long)sf + STACKFRAME32_SZ);
274 i = 0;
275 do {
276 printk("s%d: %08x\n", i++, *stk++);
277 } while ((size -= sizeof(unsigned)));
278 }
279
280 #ifdef CONFIG_SMP
281 static DEFINE_SPINLOCK(regdump_lock);
282 #endif
283
284 void __show_regs(struct pt_regs * regs)
285 {
286 #ifdef CONFIG_SMP
287 unsigned long flags;
288
289 /* Protect against xcall ipis which might lead to livelock on the lock */
290 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
291 "wrpr %0, %1, %%pstate"
292 : "=r" (flags)
293 : "i" (PSTATE_IE));
294 spin_lock(&regdump_lock);
295 #endif
296 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
297 regs->tpc, regs->tnpc, regs->y, print_tainted());
298 print_symbol("TPC: <%s>\n", regs->tpc);
299 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
300 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
301 regs->u_regs[3]);
302 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
303 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
304 regs->u_regs[7]);
305 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
306 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
307 regs->u_regs[11]);
308 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
309 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
310 regs->u_regs[15]);
311 print_symbol("RPC: <%s>\n", regs->u_regs[15]);
312 show_regwindow(regs);
313 #ifdef CONFIG_SMP
314 spin_unlock(&regdump_lock);
315 __asm__ __volatile__("wrpr %0, 0, %%pstate"
316 : : "r" (flags));
317 #endif
318 }
319
320 #ifdef VERBOSE_SHOWREGS
321 static void idump_from_user (unsigned int *pc)
322 {
323 int i;
324 int code;
325
326 if((((unsigned long) pc) & 3))
327 return;
328
329 pc -= 3;
330 for(i = -3; i < 6; i++) {
331 get_user(code, pc);
332 printk("%c%08x%c",i?' ':'<',code,i?' ':'>');
333 pc++;
334 }
335 printk("\n");
336 }
337 #endif
338
339 void show_regs(struct pt_regs *regs)
340 {
341 #ifdef VERBOSE_SHOWREGS
342 extern long etrap, etraptl1;
343 #endif
344 __show_regs(regs);
345 #ifdef CONFIG_SMP
346 {
347 extern void smp_report_regs(void);
348
349 smp_report_regs();
350 }
351 #endif
352
353 #ifdef VERBOSE_SHOWREGS
354 if (regs->tpc >= &etrap && regs->tpc < &etraptl1 &&
355 regs->u_regs[14] >= (long)current - PAGE_SIZE &&
356 regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) {
357 printk ("*********parent**********\n");
358 __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF));
359 idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc);
360 printk ("*********endpar**********\n");
361 }
362 #endif
363 }
364
365 void show_regs32(struct pt_regs32 *regs)
366 {
367 printk("PSR: %08x PC: %08x NPC: %08x Y: %08x %s\n", regs->psr,
368 regs->pc, regs->npc, regs->y, print_tainted());
369 printk("g0: %08x g1: %08x g2: %08x g3: %08x ",
370 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
371 regs->u_regs[3]);
372 printk("g4: %08x g5: %08x g6: %08x g7: %08x\n",
373 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
374 regs->u_regs[7]);
375 printk("o0: %08x o1: %08x o2: %08x o3: %08x ",
376 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
377 regs->u_regs[11]);
378 printk("o4: %08x o5: %08x sp: %08x ret_pc: %08x\n",
379 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
380 regs->u_regs[15]);
381 }
382
383 unsigned long thread_saved_pc(struct task_struct *tsk)
384 {
385 struct thread_info *ti = tsk->thread_info;
386 unsigned long ret = 0xdeadbeefUL;
387
388 if (ti && ti->ksp) {
389 unsigned long *sp;
390 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
391 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
392 sp[14]) {
393 unsigned long *fp;
394 fp = (unsigned long *)(sp[14] + STACK_BIAS);
395 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
396 ret = fp[15];
397 }
398 }
399 return ret;
400 }
401
402 /* Free current thread data structures etc.. */
403 void exit_thread(void)
404 {
405 struct thread_info *t = current_thread_info();
406
407 if (t->utraps) {
408 if (t->utraps[0] < 2)
409 kfree (t->utraps);
410 else
411 t->utraps[0]--;
412 }
413
414 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
415 t->user_cntd0 = t->user_cntd1 = NULL;
416 t->pcr_reg = 0;
417 write_pcr(0);
418 }
419 }
420
421 void flush_thread(void)
422 {
423 struct thread_info *t = current_thread_info();
424
425 if (t->flags & _TIF_ABI_PENDING)
426 t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT);
427
428 if (t->task->mm) {
429 unsigned long pgd_cache = 0UL;
430 if (test_thread_flag(TIF_32BIT)) {
431 struct mm_struct *mm = t->task->mm;
432 pgd_t *pgd0 = &mm->pgd[0];
433 pud_t *pud0 = pud_offset(pgd0, 0);
434
435 if (pud_none(*pud0)) {
436 pmd_t *page = pmd_alloc_one(mm, 0);
437 pud_set(pud0, page);
438 }
439 pgd_cache = get_pgd_cache(pgd0);
440 }
441 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
442 "membar #Sync"
443 : /* no outputs */
444 : "r" (pgd_cache),
445 "r" (TSB_REG),
446 "i" (ASI_DMMU));
447 }
448 set_thread_wsaved(0);
449
450 /* Turn off performance counters if on. */
451 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
452 t->user_cntd0 = t->user_cntd1 = NULL;
453 t->pcr_reg = 0;
454 write_pcr(0);
455 }
456
457 /* Clear FPU register state. */
458 t->fpsaved[0] = 0;
459
460 if (get_thread_current_ds() != ASI_AIUS)
461 set_fs(USER_DS);
462
463 /* Init new signal delivery disposition. */
464 clear_thread_flag(TIF_NEWSIGNALS);
465 }
466
467 /* It's a bit more tricky when 64-bit tasks are involved... */
468 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
469 {
470 unsigned long fp, distance, rval;
471
472 if (!(test_thread_flag(TIF_32BIT))) {
473 csp += STACK_BIAS;
474 psp += STACK_BIAS;
475 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
476 fp += STACK_BIAS;
477 } else
478 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
479
480 /* Now 8-byte align the stack as this is mandatory in the
481 * Sparc ABI due to how register windows work. This hides
482 * the restriction from thread libraries etc. -DaveM
483 */
484 csp &= ~7UL;
485
486 distance = fp - psp;
487 rval = (csp - distance);
488 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
489 rval = 0;
490 else if (test_thread_flag(TIF_32BIT)) {
491 if (put_user(((u32)csp),
492 &(((struct reg_window32 __user *)rval)->ins[6])))
493 rval = 0;
494 } else {
495 if (put_user(((u64)csp - STACK_BIAS),
496 &(((struct reg_window __user *)rval)->ins[6])))
497 rval = 0;
498 else
499 rval = rval - STACK_BIAS;
500 }
501
502 return rval;
503 }
504
505 /* Standard stuff. */
506 static inline void shift_window_buffer(int first_win, int last_win,
507 struct thread_info *t)
508 {
509 int i;
510
511 for (i = first_win; i < last_win; i++) {
512 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
513 memcpy(&t->reg_window[i], &t->reg_window[i+1],
514 sizeof(struct reg_window));
515 }
516 }
517
518 void synchronize_user_stack(void)
519 {
520 struct thread_info *t = current_thread_info();
521 unsigned long window;
522
523 flush_user_windows();
524 if ((window = get_thread_wsaved()) != 0) {
525 int winsize = sizeof(struct reg_window);
526 int bias = 0;
527
528 if (test_thread_flag(TIF_32BIT))
529 winsize = sizeof(struct reg_window32);
530 else
531 bias = STACK_BIAS;
532
533 window -= 1;
534 do {
535 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
536 struct reg_window *rwin = &t->reg_window[window];
537
538 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
539 shift_window_buffer(window, get_thread_wsaved() - 1, t);
540 set_thread_wsaved(get_thread_wsaved() - 1);
541 }
542 } while (window--);
543 }
544 }
545
546 void fault_in_user_windows(void)
547 {
548 struct thread_info *t = current_thread_info();
549 unsigned long window;
550 int winsize = sizeof(struct reg_window);
551 int bias = 0;
552
553 if (test_thread_flag(TIF_32BIT))
554 winsize = sizeof(struct reg_window32);
555 else
556 bias = STACK_BIAS;
557
558 flush_user_windows();
559 window = get_thread_wsaved();
560
561 if (window != 0) {
562 window -= 1;
563 do {
564 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
565 struct reg_window *rwin = &t->reg_window[window];
566
567 if (copy_to_user((char __user *)sp, rwin, winsize))
568 goto barf;
569 } while (window--);
570 }
571 set_thread_wsaved(0);
572 return;
573
574 barf:
575 set_thread_wsaved(window + 1);
576 do_exit(SIGILL);
577 }
578
579 asmlinkage long sparc_do_fork(unsigned long clone_flags,
580 unsigned long stack_start,
581 struct pt_regs *regs,
582 unsigned long stack_size)
583 {
584 int __user *parent_tid_ptr, *child_tid_ptr;
585
586 #ifdef CONFIG_COMPAT
587 if (test_thread_flag(TIF_32BIT)) {
588 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
589 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
590 } else
591 #endif
592 {
593 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
594 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
595 }
596
597 return do_fork(clone_flags, stack_start,
598 regs, stack_size,
599 parent_tid_ptr, child_tid_ptr);
600 }
601
602 /* Copy a Sparc thread. The fork() return value conventions
603 * under SunOS are nothing short of bletcherous:
604 * Parent --> %o0 == childs pid, %o1 == 0
605 * Child --> %o0 == parents pid, %o1 == 1
606 */
607 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
608 unsigned long unused,
609 struct task_struct *p, struct pt_regs *regs)
610 {
611 struct thread_info *t = p->thread_info;
612 char *child_trap_frame;
613
614 /* Calculate offset to stack_frame & pt_regs */
615 child_trap_frame = ((char *)t) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ));
616 memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ));
617
618 t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
619 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
620 t->new_child = 1;
621 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
622 t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf));
623 t->fpsaved[0] = 0;
624
625 if (regs->tstate & TSTATE_PRIV) {
626 /* Special case, if we are spawning a kernel thread from
627 * a userspace task (via KMOD, NFS, or similar) we must
628 * disable performance counters in the child because the
629 * address space and protection realm are changing.
630 */
631 if (t->flags & _TIF_PERFCTR) {
632 t->user_cntd0 = t->user_cntd1 = NULL;
633 t->pcr_reg = 0;
634 t->flags &= ~_TIF_PERFCTR;
635 }
636 t->kregs->u_regs[UREG_FP] = t->ksp;
637 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
638 flush_register_windows();
639 memcpy((void *)(t->ksp + STACK_BIAS),
640 (void *)(regs->u_regs[UREG_FP] + STACK_BIAS),
641 sizeof(struct sparc_stackf));
642 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
643 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
644 } else {
645 if (t->flags & _TIF_32BIT) {
646 sp &= 0x00000000ffffffffUL;
647 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
648 }
649 t->kregs->u_regs[UREG_FP] = sp;
650 t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
651 if (sp != regs->u_regs[UREG_FP]) {
652 unsigned long csp;
653
654 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
655 if (!csp)
656 return -EFAULT;
657 t->kregs->u_regs[UREG_FP] = csp;
658 }
659 if (t->utraps)
660 t->utraps[0]++;
661 }
662
663 /* Set the return value for the child. */
664 t->kregs->u_regs[UREG_I0] = current->pid;
665 t->kregs->u_regs[UREG_I1] = 1;
666
667 /* Set the second return value for the parent. */
668 regs->u_regs[UREG_I1] = 0;
669
670 if (clone_flags & CLONE_SETTLS)
671 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
672
673 return 0;
674 }
675
676 /*
677 * This is the mechanism for creating a new kernel thread.
678 *
679 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
680 * who haven't done an "execve()") should use this: it will work within
681 * a system call from a "real" process, but the process memory space will
682 * not be free'd until both the parent and the child have exited.
683 */
684 pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
685 {
686 long retval;
687
688 /* If the parent runs before fn(arg) is called by the child,
689 * the input registers of this function can be clobbered.
690 * So we stash 'fn' and 'arg' into global registers which
691 * will not be modified by the parent.
692 */
693 __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
694 "mov %5, %%g3\n\t" /* Save ARG into global */
695 "mov %1, %%g1\n\t" /* Clone syscall nr. */
696 "mov %2, %%o0\n\t" /* Clone flags. */
697 "mov 0, %%o1\n\t" /* usp arg == 0 */
698 "t 0x6d\n\t" /* Linux/Sparc clone(). */
699 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
700 " mov %%o0, %0\n\t"
701 "jmpl %%g2, %%o7\n\t" /* Call the function. */
702 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
703 "mov %3, %%g1\n\t"
704 "t 0x6d\n\t" /* Linux/Sparc exit(). */
705 /* Notreached by child. */
706 "1:" :
707 "=r" (retval) :
708 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
709 "i" (__NR_exit), "r" (fn), "r" (arg) :
710 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
711 return retval;
712 }
713
714 /*
715 * fill in the user structure for a core dump..
716 */
717 void dump_thread(struct pt_regs * regs, struct user * dump)
718 {
719 /* Only should be used for SunOS and ancient a.out
720 * SparcLinux binaries... Not worth implementing.
721 */
722 memset(dump, 0, sizeof(struct user));
723 }
724
725 typedef struct {
726 union {
727 unsigned int pr_regs[32];
728 unsigned long pr_dregs[16];
729 } pr_fr;
730 unsigned int __unused;
731 unsigned int pr_fsr;
732 unsigned char pr_qcnt;
733 unsigned char pr_q_entrysize;
734 unsigned char pr_en;
735 unsigned int pr_q[64];
736 } elf_fpregset_t32;
737
738 /*
739 * fill in the fpu structure for a core dump.
740 */
741 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
742 {
743 unsigned long *kfpregs = current_thread_info()->fpregs;
744 unsigned long fprs = current_thread_info()->fpsaved[0];
745
746 if (test_thread_flag(TIF_32BIT)) {
747 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
748
749 if (fprs & FPRS_DL)
750 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
751 sizeof(unsigned int) * 32);
752 else
753 memset(&fpregs32->pr_fr.pr_regs[0], 0,
754 sizeof(unsigned int) * 32);
755 fpregs32->pr_qcnt = 0;
756 fpregs32->pr_q_entrysize = 8;
757 memset(&fpregs32->pr_q[0], 0,
758 (sizeof(unsigned int) * 64));
759 if (fprs & FPRS_FEF) {
760 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
761 fpregs32->pr_en = 1;
762 } else {
763 fpregs32->pr_fsr = 0;
764 fpregs32->pr_en = 0;
765 }
766 } else {
767 if(fprs & FPRS_DL)
768 memcpy(&fpregs->pr_regs[0], kfpregs,
769 sizeof(unsigned int) * 32);
770 else
771 memset(&fpregs->pr_regs[0], 0,
772 sizeof(unsigned int) * 32);
773 if(fprs & FPRS_DU)
774 memcpy(&fpregs->pr_regs[16], kfpregs+16,
775 sizeof(unsigned int) * 32);
776 else
777 memset(&fpregs->pr_regs[16], 0,
778 sizeof(unsigned int) * 32);
779 if(fprs & FPRS_FEF) {
780 fpregs->pr_fsr = current_thread_info()->xfsr[0];
781 fpregs->pr_gsr = current_thread_info()->gsr[0];
782 } else {
783 fpregs->pr_fsr = fpregs->pr_gsr = 0;
784 }
785 fpregs->pr_fprs = fprs;
786 }
787 return 1;
788 }
789
790 /*
791 * sparc_execve() executes a new program after the asm stub has set
792 * things up for us. This should basically do what I want it to.
793 */
794 asmlinkage int sparc_execve(struct pt_regs *regs)
795 {
796 int error, base = 0;
797 char *filename;
798
799 /* User register window flush is done by entry.S */
800
801 /* Check for indirect call. */
802 if (regs->u_regs[UREG_G1] == 0)
803 base = 1;
804
805 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
806 error = PTR_ERR(filename);
807 if (IS_ERR(filename))
808 goto out;
809 error = do_execve(filename,
810 (char __user * __user *)
811 regs->u_regs[base + UREG_I1],
812 (char __user * __user *)
813 regs->u_regs[base + UREG_I2], regs);
814 putname(filename);
815 if (!error) {
816 fprs_write(0);
817 current_thread_info()->xfsr[0] = 0;
818 current_thread_info()->fpsaved[0] = 0;
819 regs->tstate &= ~TSTATE_PEF;
820 task_lock(current);
821 current->ptrace &= ~PT_DTRACE;
822 task_unlock(current);
823 }
824 out:
825 return error;
826 }
827
828 unsigned long get_wchan(struct task_struct *task)
829 {
830 unsigned long pc, fp, bias = 0;
831 unsigned long thread_info_base;
832 struct reg_window *rw;
833 unsigned long ret = 0;
834 int count = 0;
835
836 if (!task || task == current ||
837 task->state == TASK_RUNNING)
838 goto out;
839
840 thread_info_base = (unsigned long) task->thread_info;
841 bias = STACK_BIAS;
842 fp = task->thread_info->ksp + bias;
843
844 do {
845 /* Bogus frame pointer? */
846 if (fp < (thread_info_base + sizeof(struct thread_info)) ||
847 fp >= (thread_info_base + THREAD_SIZE))
848 break;
849 rw = (struct reg_window *) fp;
850 pc = rw->ins[7];
851 if (!in_sched_functions(pc)) {
852 ret = pc;
853 goto out;
854 }
855 fp = rw->ins[6] + bias;
856 } while (++count < 16);
857
858 out:
859 return ret;
860 }
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