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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / sparc64 / kernel / process.c
blob26d3ec41da1c376fbe855ec1253c56c327fed43f
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 if (current->pid != 0)
66 return;
67
68 /* endless idle loop with no priority at all */
69 for (;;) {
70 /* If current->work.need_resched is zero we should really
71 * setup for a system wakup event and execute a shutdown
72 * instruction.
73 *
74 * But this requires writing back the contents of the
75 * L2 cache etc. so implement this later. -DaveM
76 */
77 while (!need_resched())
78 barrier();
79
80 schedule();
81 check_pgt_cache();
82 }
83 return;
84 }
85
86 #else
87
88 /*
89 * the idle loop on a UltraMultiPenguin...
90 */
91 #define idle_me_harder() (cpu_data(smp_processor_id()).idle_volume += 1)
92 #define unidle_me() (cpu_data(smp_processor_id()).idle_volume = 0)
93 void cpu_idle(void)
94 {
95 set_thread_flag(TIF_POLLING_NRFLAG);
96 while(1) {
97 if (need_resched()) {
98 unidle_me();
99 clear_thread_flag(TIF_POLLING_NRFLAG);
100 schedule();
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("#StoreStore | #StoreLoad");
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 EXPORT_SYMBOL(machine_halt);
132
133 void machine_alt_power_off(void)
134 {
135 if (!serial_console && prom_palette)
136 prom_palette(1);
137 if (prom_keyboard)
138 prom_keyboard();
139 prom_halt_power_off();
140 panic("Power-off failed!");
141 }
142
143 void machine_restart(char * cmd)
144 {
145 char *p;
146
147 p = strchr (reboot_command, '\n');
148 if (p) *p = 0;
149 if (!serial_console && prom_palette)
150 prom_palette (1);
151 if (prom_keyboard)
152 prom_keyboard();
153 if (cmd)
154 prom_reboot(cmd);
155 if (*reboot_command)
156 prom_reboot(reboot_command);
157 prom_reboot("");
158 panic("Reboot failed!");
159 }
160
161 EXPORT_SYMBOL(machine_restart);
162
163 static void show_regwindow32(struct pt_regs *regs)
164 {
165 struct reg_window32 __user *rw;
166 struct reg_window32 r_w;
167 mm_segment_t old_fs;
168
169 __asm__ __volatile__ ("flushw");
170 rw = compat_ptr((unsigned)regs->u_regs[14]);
171 old_fs = get_fs();
172 set_fs (USER_DS);
173 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
174 set_fs (old_fs);
175 return;
176 }
177
178 set_fs (old_fs);
179 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
180 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
181 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
182 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
183 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
184 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
185 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
186 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
187 }
188
189 static void show_regwindow(struct pt_regs *regs)
190 {
191 struct reg_window __user *rw;
192 struct reg_window *rwk;
193 struct reg_window r_w;
194 mm_segment_t old_fs;
195
196 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
197 __asm__ __volatile__ ("flushw");
198 rw = (struct reg_window __user *)
199 (regs->u_regs[14] + STACK_BIAS);
200 rwk = (struct reg_window *)
201 (regs->u_regs[14] + STACK_BIAS);
202 if (!(regs->tstate & TSTATE_PRIV)) {
203 old_fs = get_fs();
204 set_fs (USER_DS);
205 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
206 set_fs (old_fs);
207 return;
208 }
209 rwk = &r_w;
210 set_fs (old_fs);
211 }
212 } else {
213 show_regwindow32(regs);
214 return;
215 }
216 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
217 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
218 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
219 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
220 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
221 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
222 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
223 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
224 if (regs->tstate & TSTATE_PRIV)
225 print_symbol("I7: <%s>\n", rwk->ins[7]);
226 }
227
228 void show_stackframe(struct sparc_stackf *sf)
229 {
230 unsigned long size;
231 unsigned long *stk;
232 int i;
233
234 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n"
235 "l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
236 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3],
237 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
238 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n"
239 "i4: %016lx i5: %016lx fp: %016lx ret_pc: %016lx\n",
240 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3],
241 sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc);
242 printk("sp: %016lx x0: %016lx x1: %016lx x2: %016lx\n"
243 "x3: %016lx x4: %016lx x5: %016lx xx: %016lx\n",
244 (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1],
245 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
246 sf->xxargs[0]);
247 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
248 size -= STACKFRAME_SZ;
249 stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ);
250 i = 0;
251 do {
252 printk("s%d: %016lx\n", i++, *stk++);
253 } while ((size -= sizeof(unsigned long)));
254 }
255
256 void show_stackframe32(struct sparc_stackf32 *sf)
257 {
258 unsigned long size;
259 unsigned *stk;
260 int i;
261
262 printk("l0: %08x l1: %08x l2: %08x l3: %08x\n",
263 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3]);
264 printk("l4: %08x l5: %08x l6: %08x l7: %08x\n",
265 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
266 printk("i0: %08x i1: %08x i2: %08x i3: %08x\n",
267 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3]);
268 printk("i4: %08x i5: %08x fp: %08x ret_pc: %08x\n",
269 sf->ins[4], sf->ins[5], sf->fp, sf->callers_pc);
270 printk("sp: %08x x0: %08x x1: %08x x2: %08x\n"
271 "x3: %08x x4: %08x x5: %08x xx: %08x\n",
272 sf->structptr, sf->xargs[0], sf->xargs[1],
273 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
274 sf->xxargs[0]);
275 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
276 size -= STACKFRAME32_SZ;
277 stk = (unsigned *)((unsigned long)sf + STACKFRAME32_SZ);
278 i = 0;
279 do {
280 printk("s%d: %08x\n", i++, *stk++);
281 } while ((size -= sizeof(unsigned)));
282 }
283
284 #ifdef CONFIG_SMP
285 static DEFINE_SPINLOCK(regdump_lock);
286 #endif
287
288 void __show_regs(struct pt_regs * regs)
289 {
290 #ifdef CONFIG_SMP
291 unsigned long flags;
292
293 /* Protect against xcall ipis which might lead to livelock on the lock */
294 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
295 "wrpr %0, %1, %%pstate"
296 : "=r" (flags)
297 : "i" (PSTATE_IE));
298 spin_lock(&regdump_lock);
299 #endif
300 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
301 regs->tpc, regs->tnpc, regs->y, print_tainted());
302 print_symbol("TPC: <%s>\n", regs->tpc);
303 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
304 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
305 regs->u_regs[3]);
306 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
307 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
308 regs->u_regs[7]);
309 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
310 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
311 regs->u_regs[11]);
312 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
313 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
314 regs->u_regs[15]);
315 print_symbol("RPC: <%s>\n", regs->u_regs[15]);
316 show_regwindow(regs);
317 #ifdef CONFIG_SMP
318 spin_unlock(&regdump_lock);
319 __asm__ __volatile__("wrpr %0, 0, %%pstate"
320 : : "r" (flags));
321 #endif
322 }
323
324 #ifdef VERBOSE_SHOWREGS
325 static void idump_from_user (unsigned int *pc)
326 {
327 int i;
328 int code;
329
330 if((((unsigned long) pc) & 3))
331 return;
332
333 pc -= 3;
334 for(i = -3; i < 6; i++) {
335 get_user(code, pc);
336 printk("%c%08x%c",i?' ':'<',code,i?' ':'>');
337 pc++;
338 }
339 printk("\n");
340 }
341 #endif
342
343 void show_regs(struct pt_regs *regs)
344 {
345 #ifdef VERBOSE_SHOWREGS
346 extern long etrap, etraptl1;
347 #endif
348 __show_regs(regs);
349 #ifdef CONFIG_SMP
350 {
351 extern void smp_report_regs(void);
352
353 smp_report_regs();
354 }
355 #endif
356
357 #ifdef VERBOSE_SHOWREGS
358 if (regs->tpc >= &etrap && regs->tpc < &etraptl1 &&
359 regs->u_regs[14] >= (long)current - PAGE_SIZE &&
360 regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) {
361 printk ("*********parent**********\n");
362 __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF));
363 idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc);
364 printk ("*********endpar**********\n");
365 }
366 #endif
367 }
368
369 void show_regs32(struct pt_regs32 *regs)
370 {
371 printk("PSR: %08x PC: %08x NPC: %08x Y: %08x %s\n", regs->psr,
372 regs->pc, regs->npc, regs->y, print_tainted());
373 printk("g0: %08x g1: %08x g2: %08x g3: %08x ",
374 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
375 regs->u_regs[3]);
376 printk("g4: %08x g5: %08x g6: %08x g7: %08x\n",
377 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
378 regs->u_regs[7]);
379 printk("o0: %08x o1: %08x o2: %08x o3: %08x ",
380 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
381 regs->u_regs[11]);
382 printk("o4: %08x o5: %08x sp: %08x ret_pc: %08x\n",
383 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
384 regs->u_regs[15]);
385 }
386
387 unsigned long thread_saved_pc(struct task_struct *tsk)
388 {
389 struct thread_info *ti = tsk->thread_info;
390 unsigned long ret = 0xdeadbeefUL;
391
392 if (ti && ti->ksp) {
393 unsigned long *sp;
394 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
395 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
396 sp[14]) {
397 unsigned long *fp;
398 fp = (unsigned long *)(sp[14] + STACK_BIAS);
399 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
400 ret = fp[15];
401 }
402 }
403 return ret;
404 }
405
406 /* Free current thread data structures etc.. */
407 void exit_thread(void)
408 {
409 struct thread_info *t = current_thread_info();
410
411 if (t->utraps) {
412 if (t->utraps[0] < 2)
413 kfree (t->utraps);
414 else
415 t->utraps[0]--;
416 }
417
418 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
419 t->user_cntd0 = t->user_cntd1 = NULL;
420 t->pcr_reg = 0;
421 write_pcr(0);
422 }
423 }
424
425 void flush_thread(void)
426 {
427 struct thread_info *t = current_thread_info();
428
429 if (t->flags & _TIF_ABI_PENDING)
430 t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT);
431
432 if (t->task->mm) {
433 unsigned long pgd_cache = 0UL;
434 if (test_thread_flag(TIF_32BIT)) {
435 struct mm_struct *mm = t->task->mm;
436 pgd_t *pgd0 = &mm->pgd[0];
437 pud_t *pud0 = pud_offset(pgd0, 0);
438
439 if (pud_none(*pud0)) {
440 pmd_t *page = pmd_alloc_one(mm, 0);
441 pud_set(pud0, page);
442 }
443 pgd_cache = get_pgd_cache(pgd0);
444 }
445 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
446 "membar #Sync"
447 : /* no outputs */
448 : "r" (pgd_cache),
449 "r" (TSB_REG),
450 "i" (ASI_DMMU));
451 }
452 set_thread_wsaved(0);
453
454 /* Turn off performance counters if on. */
455 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
456 t->user_cntd0 = t->user_cntd1 = NULL;
457 t->pcr_reg = 0;
458 write_pcr(0);
459 }
460
461 /* Clear FPU register state. */
462 t->fpsaved[0] = 0;
463
464 if (get_thread_current_ds() != ASI_AIUS)
465 set_fs(USER_DS);
466
467 /* Init new signal delivery disposition. */
468 clear_thread_flag(TIF_NEWSIGNALS);
469 }
470
471 /* It's a bit more tricky when 64-bit tasks are involved... */
472 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
473 {
474 unsigned long fp, distance, rval;
475
476 if (!(test_thread_flag(TIF_32BIT))) {
477 csp += STACK_BIAS;
478 psp += STACK_BIAS;
479 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
480 fp += STACK_BIAS;
481 } else
482 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
483
484 /* Now 8-byte align the stack as this is mandatory in the
485 * Sparc ABI due to how register windows work. This hides
486 * the restriction from thread libraries etc. -DaveM
487 */
488 csp &= ~7UL;
489
490 distance = fp - psp;
491 rval = (csp - distance);
492 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
493 rval = 0;
494 else if (test_thread_flag(TIF_32BIT)) {
495 if (put_user(((u32)csp),
496 &(((struct reg_window32 __user *)rval)->ins[6])))
497 rval = 0;
498 } else {
499 if (put_user(((u64)csp - STACK_BIAS),
500 &(((struct reg_window __user *)rval)->ins[6])))
501 rval = 0;
502 else
503 rval = rval - STACK_BIAS;
504 }
505
506 return rval;
507 }
508
509 /* Standard stuff. */
510 static inline void shift_window_buffer(int first_win, int last_win,
511 struct thread_info *t)
512 {
513 int i;
514
515 for (i = first_win; i < last_win; i++) {
516 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
517 memcpy(&t->reg_window[i], &t->reg_window[i+1],
518 sizeof(struct reg_window));
519 }
520 }
521
522 void synchronize_user_stack(void)
523 {
524 struct thread_info *t = current_thread_info();
525 unsigned long window;
526
527 flush_user_windows();
528 if ((window = get_thread_wsaved()) != 0) {
529 int winsize = sizeof(struct reg_window);
530 int bias = 0;
531
532 if (test_thread_flag(TIF_32BIT))
533 winsize = sizeof(struct reg_window32);
534 else
535 bias = STACK_BIAS;
536
537 window -= 1;
538 do {
539 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
540 struct reg_window *rwin = &t->reg_window[window];
541
542 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
543 shift_window_buffer(window, get_thread_wsaved() - 1, t);
544 set_thread_wsaved(get_thread_wsaved() - 1);
545 }
546 } while (window--);
547 }
548 }
549
550 void fault_in_user_windows(void)
551 {
552 struct thread_info *t = current_thread_info();
553 unsigned long window;
554 int winsize = sizeof(struct reg_window);
555 int bias = 0;
556
557 if (test_thread_flag(TIF_32BIT))
558 winsize = sizeof(struct reg_window32);
559 else
560 bias = STACK_BIAS;
561
562 flush_user_windows();
563 window = get_thread_wsaved();
564
565 if (window != 0) {
566 window -= 1;
567 do {
568 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
569 struct reg_window *rwin = &t->reg_window[window];
570
571 if (copy_to_user((char __user *)sp, rwin, winsize))
572 goto barf;
573 } while (window--);
574 }
575 set_thread_wsaved(0);
576 return;
577
578 barf:
579 set_thread_wsaved(window + 1);
580 do_exit(SIGILL);
581 }
582
583 asmlinkage long sparc_do_fork(unsigned long clone_flags,
584 unsigned long stack_start,
585 struct pt_regs *regs,
586 unsigned long stack_size)
587 {
588 int __user *parent_tid_ptr, *child_tid_ptr;
589
590 #ifdef CONFIG_COMPAT
591 if (test_thread_flag(TIF_32BIT)) {
592 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
593 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
594 } else
595 #endif
596 {
597 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
598 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
599 }
600
601 return do_fork(clone_flags, stack_start,
602 regs, stack_size,
603 parent_tid_ptr, child_tid_ptr);
604 }
605
606 /* Copy a Sparc thread. The fork() return value conventions
607 * under SunOS are nothing short of bletcherous:
608 * Parent --> %o0 == childs pid, %o1 == 0
609 * Child --> %o0 == parents pid, %o1 == 1
610 */
611 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
612 unsigned long unused,
613 struct task_struct *p, struct pt_regs *regs)
614 {
615 struct thread_info *t = p->thread_info;
616 char *child_trap_frame;
617
618 #ifdef CONFIG_DEBUG_SPINLOCK
619 p->thread.smp_lock_count = 0;
620 p->thread.smp_lock_pc = 0;
621 #endif
622
623 /* Calculate offset to stack_frame & pt_regs */
624 child_trap_frame = ((char *)t) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ));
625 memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ));
626
627 t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
628 _TIF_NEWCHILD |
629 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
630 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
631 t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf));
632 t->fpsaved[0] = 0;
633
634 if (regs->tstate & TSTATE_PRIV) {
635 /* Special case, if we are spawning a kernel thread from
636 * a userspace task (via KMOD, NFS, or similar) we must
637 * disable performance counters in the child because the
638 * address space and protection realm are changing.
639 */
640 if (t->flags & _TIF_PERFCTR) {
641 t->user_cntd0 = t->user_cntd1 = NULL;
642 t->pcr_reg = 0;
643 t->flags &= ~_TIF_PERFCTR;
644 }
645 t->kregs->u_regs[UREG_FP] = t->ksp;
646 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
647 flush_register_windows();
648 memcpy((void *)(t->ksp + STACK_BIAS),
649 (void *)(regs->u_regs[UREG_FP] + STACK_BIAS),
650 sizeof(struct sparc_stackf));
651 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
652 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
653 } else {
654 if (t->flags & _TIF_32BIT) {
655 sp &= 0x00000000ffffffffUL;
656 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
657 }
658 t->kregs->u_regs[UREG_FP] = sp;
659 t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
660 if (sp != regs->u_regs[UREG_FP]) {
661 unsigned long csp;
662
663 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
664 if (!csp)
665 return -EFAULT;
666 t->kregs->u_regs[UREG_FP] = csp;
667 }
668 if (t->utraps)
669 t->utraps[0]++;
670 }
671
672 /* Set the return value for the child. */
673 t->kregs->u_regs[UREG_I0] = current->pid;
674 t->kregs->u_regs[UREG_I1] = 1;
675
676 /* Set the second return value for the parent. */
677 regs->u_regs[UREG_I1] = 0;
678
679 if (clone_flags & CLONE_SETTLS)
680 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
681
682 return 0;
683 }
684
685 /*
686 * This is the mechanism for creating a new kernel thread.
687 *
688 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
689 * who haven't done an "execve()") should use this: it will work within
690 * a system call from a "real" process, but the process memory space will
691 * not be free'd until both the parent and the child have exited.
692 */
693 pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
694 {
695 long retval;
696
697 /* If the parent runs before fn(arg) is called by the child,
698 * the input registers of this function can be clobbered.
699 * So we stash 'fn' and 'arg' into global registers which
700 * will not be modified by the parent.
701 */
702 __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
703 "mov %5, %%g3\n\t" /* Save ARG into global */
704 "mov %1, %%g1\n\t" /* Clone syscall nr. */
705 "mov %2, %%o0\n\t" /* Clone flags. */
706 "mov 0, %%o1\n\t" /* usp arg == 0 */
707 "t 0x6d\n\t" /* Linux/Sparc clone(). */
708 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
709 " mov %%o0, %0\n\t"
710 "jmpl %%g2, %%o7\n\t" /* Call the function. */
711 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
712 "mov %3, %%g1\n\t"
713 "t 0x6d\n\t" /* Linux/Sparc exit(). */
714 /* Notreached by child. */
715 "1:" :
716 "=r" (retval) :
717 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
718 "i" (__NR_exit), "r" (fn), "r" (arg) :
719 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
720 return retval;
721 }
722
723 /*
724 * fill in the user structure for a core dump..
725 */
726 void dump_thread(struct pt_regs * regs, struct user * dump)
727 {
728 /* Only should be used for SunOS and ancient a.out
729 * SparcLinux binaries... Not worth implementing.
730 */
731 memset(dump, 0, sizeof(struct user));
732 }
733
734 typedef struct {
735 union {
736 unsigned int pr_regs[32];
737 unsigned long pr_dregs[16];
738 } pr_fr;
739 unsigned int __unused;
740 unsigned int pr_fsr;
741 unsigned char pr_qcnt;
742 unsigned char pr_q_entrysize;
743 unsigned char pr_en;
744 unsigned int pr_q[64];
745 } elf_fpregset_t32;
746
747 /*
748 * fill in the fpu structure for a core dump.
749 */
750 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
751 {
752 unsigned long *kfpregs = current_thread_info()->fpregs;
753 unsigned long fprs = current_thread_info()->fpsaved[0];
754
755 if (test_thread_flag(TIF_32BIT)) {
756 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
757
758 if (fprs & FPRS_DL)
759 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
760 sizeof(unsigned int) * 32);
761 else
762 memset(&fpregs32->pr_fr.pr_regs[0], 0,
763 sizeof(unsigned int) * 32);
764 fpregs32->pr_qcnt = 0;
765 fpregs32->pr_q_entrysize = 8;
766 memset(&fpregs32->pr_q[0], 0,
767 (sizeof(unsigned int) * 64));
768 if (fprs & FPRS_FEF) {
769 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
770 fpregs32->pr_en = 1;
771 } else {
772 fpregs32->pr_fsr = 0;
773 fpregs32->pr_en = 0;
774 }
775 } else {
776 if(fprs & FPRS_DL)
777 memcpy(&fpregs->pr_regs[0], kfpregs,
778 sizeof(unsigned int) * 32);
779 else
780 memset(&fpregs->pr_regs[0], 0,
781 sizeof(unsigned int) * 32);
782 if(fprs & FPRS_DU)
783 memcpy(&fpregs->pr_regs[16], kfpregs+16,
784 sizeof(unsigned int) * 32);
785 else
786 memset(&fpregs->pr_regs[16], 0,
787 sizeof(unsigned int) * 32);
788 if(fprs & FPRS_FEF) {
789 fpregs->pr_fsr = current_thread_info()->xfsr[0];
790 fpregs->pr_gsr = current_thread_info()->gsr[0];
791 } else {
792 fpregs->pr_fsr = fpregs->pr_gsr = 0;
793 }
794 fpregs->pr_fprs = fprs;
795 }
796 return 1;
797 }
798
799 /*
800 * sparc_execve() executes a new program after the asm stub has set
801 * things up for us. This should basically do what I want it to.
802 */
803 asmlinkage int sparc_execve(struct pt_regs *regs)
804 {
805 int error, base = 0;
806 char *filename;
807
808 /* User register window flush is done by entry.S */
809
810 /* Check for indirect call. */
811 if (regs->u_regs[UREG_G1] == 0)
812 base = 1;
813
814 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
815 error = PTR_ERR(filename);
816 if (IS_ERR(filename))
817 goto out;
818 error = do_execve(filename,
819 (char __user * __user *)
820 regs->u_regs[base + UREG_I1],
821 (char __user * __user *)
822 regs->u_regs[base + UREG_I2], regs);
823 putname(filename);
824 if (!error) {
825 fprs_write(0);
826 current_thread_info()->xfsr[0] = 0;
827 current_thread_info()->fpsaved[0] = 0;
828 regs->tstate &= ~TSTATE_PEF;
829 task_lock(current);
830 current->ptrace &= ~PT_DTRACE;
831 task_unlock(current);
832 }
833 out:
834 return error;
835 }
836
837 unsigned long get_wchan(struct task_struct *task)
838 {
839 unsigned long pc, fp, bias = 0;
840 unsigned long thread_info_base;
841 struct reg_window *rw;
842 unsigned long ret = 0;
843 int count = 0;
844
845 if (!task || task == current ||
846 task->state == TASK_RUNNING)
847 goto out;
848
849 thread_info_base = (unsigned long) task->thread_info;
850 bias = STACK_BIAS;
851 fp = task->thread_info->ksp + bias;
852
853 do {
854 /* Bogus frame pointer? */
855 if (fp < (thread_info_base + sizeof(struct thread_info)) ||
856 fp >= (thread_info_base + THREAD_SIZE))
857 break;
858 rw = (struct reg_window *) fp;
859 pc = rw->ins[7];
860 if (!in_sched_functions(pc)) {
861 ret = pc;
862 goto out;
863 }
864 fp = rw->ins[6] + bias;
865 } while (++count < 16);
866
867 out:
868 return ret;
869 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree