?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[SCSI] qla1280: convert to use the data buffer accessors
[linux-2.6/verdex.git] / arch / sparc64 / kernel / process.c
blobca7cdfd55f72084c901a1dfcc3c35e507422ddf7
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/errno.h>
16 #include <linux/module.h>
17 #include <linux/sched.h>
18 #include <linux/kernel.h>
19 #include <linux/kallsyms.h>
20 #include <linux/mm.h>
21 #include <linux/fs.h>
22 #include <linux/smp.h>
23 #include <linux/stddef.h>
24 #include <linux/ptrace.h>
25 #include <linux/slab.h>
26 #include <linux/user.h>
27 #include <linux/a.out.h>
28 #include <linux/reboot.h>
29 #include <linux/delay.h>
30 #include <linux/compat.h>
31 #include <linux/tick.h>
32 #include <linux/init.h>
33 #include <linux/cpu.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/mmu_context.h>
48 #include <asm/unistd.h>
49 #include <asm/hypervisor.h>
50 #include <asm/sstate.h>
51
52 /* #define VERBOSE_SHOWREGS */
53
54 static void sparc64_yield(int cpu)
55 {
56 if (tlb_type != hypervisor)
57 return;
58
59 clear_thread_flag(TIF_POLLING_NRFLAG);
60 smp_mb__after_clear_bit();
61
62 while (!need_resched() && !cpu_is_offline(cpu)) {
63 unsigned long pstate;
64
65 /* Disable interrupts. */
66 __asm__ __volatile__(
67 "rdpr %%pstate, %0\n\t"
68 "andn %0, %1, %0\n\t"
69 "wrpr %0, %%g0, %%pstate"
70 : "=&r" (pstate)
71 : "i" (PSTATE_IE));
72
73 if (!need_resched() && !cpu_is_offline(cpu))
74 sun4v_cpu_yield();
75
76 /* Re-enable interrupts. */
77 __asm__ __volatile__(
78 "rdpr %%pstate, %0\n\t"
79 "or %0, %1, %0\n\t"
80 "wrpr %0, %%g0, %%pstate"
81 : "=&r" (pstate)
82 : "i" (PSTATE_IE));
83 }
84
85 set_thread_flag(TIF_POLLING_NRFLAG);
86 }
87
88 /* The idle loop on sparc64. */
89 void cpu_idle(void)
90 {
91 int cpu = smp_processor_id();
92
93 set_thread_flag(TIF_POLLING_NRFLAG);
94
95 while(1) {
96 tick_nohz_stop_sched_tick();
97
98 while (!need_resched() && !cpu_is_offline(cpu))
99 sparc64_yield(cpu);
100
101 tick_nohz_restart_sched_tick();
102
103 preempt_enable_no_resched();
104
105 #ifdef CONFIG_HOTPLUG_CPU
106 if (cpu_is_offline(cpu))
107 cpu_play_dead();
108 #endif
109
110 schedule();
111 preempt_disable();
112 }
113 }
114
115 extern char reboot_command [];
116
117 extern void (*prom_palette)(int);
118 extern void (*prom_keyboard)(void);
119
120 void machine_halt(void)
121 {
122 sstate_halt();
123 if (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 sstate_poweroff();
134 if (prom_palette)
135 prom_palette(1);
136 if (prom_keyboard)
137 prom_keyboard();
138 prom_halt_power_off();
139 panic("Power-off failed!");
140 }
141
142 void machine_restart(char * cmd)
143 {
144 char *p;
145
146 sstate_reboot();
147 p = strchr (reboot_command, '\n');
148 if (p) *p = 0;
149 if (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 #ifdef CONFIG_COMPAT
162 static void show_regwindow32(struct pt_regs *regs)
163 {
164 struct reg_window32 __user *rw;
165 struct reg_window32 r_w;
166 mm_segment_t old_fs;
167
168 __asm__ __volatile__ ("flushw");
169 rw = compat_ptr((unsigned)regs->u_regs[14]);
170 old_fs = get_fs();
171 set_fs (USER_DS);
172 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
173 set_fs (old_fs);
174 return;
175 }
176
177 set_fs (old_fs);
178 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
179 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
180 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
181 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
182 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
183 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
184 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
185 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
186 }
187 #else
188 #define show_regwindow32(regs) do { } while (0)
189 #endif
190
191 static void show_regwindow(struct pt_regs *regs)
192 {
193 struct reg_window __user *rw;
194 struct reg_window *rwk;
195 struct reg_window r_w;
196 mm_segment_t old_fs;
197
198 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
199 __asm__ __volatile__ ("flushw");
200 rw = (struct reg_window __user *)
201 (regs->u_regs[14] + STACK_BIAS);
202 rwk = (struct reg_window *)
203 (regs->u_regs[14] + STACK_BIAS);
204 if (!(regs->tstate & TSTATE_PRIV)) {
205 old_fs = get_fs();
206 set_fs (USER_DS);
207 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
208 set_fs (old_fs);
209 return;
210 }
211 rwk = &r_w;
212 set_fs (old_fs);
213 }
214 } else {
215 show_regwindow32(regs);
216 return;
217 }
218 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
219 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
220 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
221 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
222 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
223 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
224 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
225 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
226 if (regs->tstate & TSTATE_PRIV)
227 print_symbol("I7: <%s>\n", rwk->ins[7]);
228 }
229
230 void show_stackframe(struct sparc_stackf *sf)
231 {
232 unsigned long size;
233 unsigned long *stk;
234 int i;
235
236 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n"
237 "l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
238 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3],
239 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
240 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n"
241 "i4: %016lx i5: %016lx fp: %016lx ret_pc: %016lx\n",
242 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3],
243 sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc);
244 printk("sp: %016lx x0: %016lx x1: %016lx x2: %016lx\n"
245 "x3: %016lx x4: %016lx x5: %016lx xx: %016lx\n",
246 (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1],
247 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
248 sf->xxargs[0]);
249 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
250 size -= STACKFRAME_SZ;
251 stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ);
252 i = 0;
253 do {
254 printk("s%d: %016lx\n", i++, *stk++);
255 } while ((size -= sizeof(unsigned long)));
256 }
257
258 void show_stackframe32(struct sparc_stackf32 *sf)
259 {
260 unsigned long size;
261 unsigned *stk;
262 int i;
263
264 printk("l0: %08x l1: %08x l2: %08x l3: %08x\n",
265 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3]);
266 printk("l4: %08x l5: %08x l6: %08x l7: %08x\n",
267 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
268 printk("i0: %08x i1: %08x i2: %08x i3: %08x\n",
269 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3]);
270 printk("i4: %08x i5: %08x fp: %08x ret_pc: %08x\n",
271 sf->ins[4], sf->ins[5], sf->fp, sf->callers_pc);
272 printk("sp: %08x x0: %08x x1: %08x x2: %08x\n"
273 "x3: %08x x4: %08x x5: %08x xx: %08x\n",
274 sf->structptr, sf->xargs[0], sf->xargs[1],
275 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
276 sf->xxargs[0]);
277 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
278 size -= STACKFRAME32_SZ;
279 stk = (unsigned *)((unsigned long)sf + STACKFRAME32_SZ);
280 i = 0;
281 do {
282 printk("s%d: %08x\n", i++, *stk++);
283 } while ((size -= sizeof(unsigned)));
284 }
285
286 #ifdef CONFIG_SMP
287 static DEFINE_SPINLOCK(regdump_lock);
288 #endif
289
290 void __show_regs(struct pt_regs * regs)
291 {
292 #ifdef CONFIG_SMP
293 unsigned long flags;
294
295 /* Protect against xcall ipis which might lead to livelock on the lock */
296 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
297 "wrpr %0, %1, %%pstate"
298 : "=r" (flags)
299 : "i" (PSTATE_IE));
300 spin_lock(&regdump_lock);
301 #endif
302 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
303 regs->tpc, regs->tnpc, regs->y, print_tainted());
304 print_symbol("TPC: <%s>\n", regs->tpc);
305 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
306 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
307 regs->u_regs[3]);
308 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
309 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
310 regs->u_regs[7]);
311 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
312 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
313 regs->u_regs[11]);
314 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
315 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
316 regs->u_regs[15]);
317 print_symbol("RPC: <%s>\n", regs->u_regs[15]);
318 show_regwindow(regs);
319 #ifdef CONFIG_SMP
320 spin_unlock(&regdump_lock);
321 __asm__ __volatile__("wrpr %0, 0, %%pstate"
322 : : "r" (flags));
323 #endif
324 }
325
326 #ifdef VERBOSE_SHOWREGS
327 static void idump_from_user (unsigned int *pc)
328 {
329 int i;
330 int code;
331
332 if((((unsigned long) pc) & 3))
333 return;
334
335 pc -= 3;
336 for(i = -3; i < 6; i++) {
337 get_user(code, pc);
338 printk("%c%08x%c",i?' ':'<',code,i?' ':'>');
339 pc++;
340 }
341 printk("\n");
342 }
343 #endif
344
345 void show_regs(struct pt_regs *regs)
346 {
347 #ifdef VERBOSE_SHOWREGS
348 extern long etrap, etraptl1;
349 #endif
350 __show_regs(regs);
351 #if 0
352 #ifdef CONFIG_SMP
353 {
354 extern void smp_report_regs(void);
355
356 smp_report_regs();
357 }
358 #endif
359 #endif
360
361 #ifdef VERBOSE_SHOWREGS
362 if (regs->tpc >= &etrap && regs->tpc < &etraptl1 &&
363 regs->u_regs[14] >= (long)current - PAGE_SIZE &&
364 regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) {
365 printk ("*********parent**********\n");
366 __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF));
367 idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc);
368 printk ("*********endpar**********\n");
369 }
370 #endif
371 }
372
373 void show_regs32(struct pt_regs32 *regs)
374 {
375 printk("PSR: %08x PC: %08x NPC: %08x Y: %08x %s\n", regs->psr,
376 regs->pc, regs->npc, regs->y, print_tainted());
377 printk("g0: %08x g1: %08x g2: %08x g3: %08x ",
378 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
379 regs->u_regs[3]);
380 printk("g4: %08x g5: %08x g6: %08x g7: %08x\n",
381 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
382 regs->u_regs[7]);
383 printk("o0: %08x o1: %08x o2: %08x o3: %08x ",
384 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
385 regs->u_regs[11]);
386 printk("o4: %08x o5: %08x sp: %08x ret_pc: %08x\n",
387 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
388 regs->u_regs[15]);
389 }
390
391 unsigned long thread_saved_pc(struct task_struct *tsk)
392 {
393 struct thread_info *ti = task_thread_info(tsk);
394 unsigned long ret = 0xdeadbeefUL;
395
396 if (ti && ti->ksp) {
397 unsigned long *sp;
398 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
399 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
400 sp[14]) {
401 unsigned long *fp;
402 fp = (unsigned long *)(sp[14] + STACK_BIAS);
403 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
404 ret = fp[15];
405 }
406 }
407 return ret;
408 }
409
410 /* Free current thread data structures etc.. */
411 void exit_thread(void)
412 {
413 struct thread_info *t = current_thread_info();
414
415 if (t->utraps) {
416 if (t->utraps[0] < 2)
417 kfree (t->utraps);
418 else
419 t->utraps[0]--;
420 }
421
422 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
423 t->user_cntd0 = t->user_cntd1 = NULL;
424 t->pcr_reg = 0;
425 write_pcr(0);
426 }
427 }
428
429 void flush_thread(void)
430 {
431 struct thread_info *t = current_thread_info();
432 struct mm_struct *mm;
433
434 if (test_ti_thread_flag(t, TIF_ABI_PENDING)) {
435 clear_ti_thread_flag(t, TIF_ABI_PENDING);
436 if (test_ti_thread_flag(t, TIF_32BIT))
437 clear_ti_thread_flag(t, TIF_32BIT);
438 else
439 set_ti_thread_flag(t, TIF_32BIT);
440 }
441
442 mm = t->task->mm;
443 if (mm)
444 tsb_context_switch(mm);
445
446 set_thread_wsaved(0);
447
448 /* Turn off performance counters if on. */
449 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
450 t->user_cntd0 = t->user_cntd1 = NULL;
451 t->pcr_reg = 0;
452 write_pcr(0);
453 }
454
455 /* Clear FPU register state. */
456 t->fpsaved[0] = 0;
457
458 if (get_thread_current_ds() != ASI_AIUS)
459 set_fs(USER_DS);
460
461 /* Init new signal delivery disposition. */
462 clear_thread_flag(TIF_NEWSIGNALS);
463 }
464
465 /* It's a bit more tricky when 64-bit tasks are involved... */
466 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
467 {
468 unsigned long fp, distance, rval;
469
470 if (!(test_thread_flag(TIF_32BIT))) {
471 csp += STACK_BIAS;
472 psp += STACK_BIAS;
473 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
474 fp += STACK_BIAS;
475 } else
476 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
477
478 /* Now 8-byte align the stack as this is mandatory in the
479 * Sparc ABI due to how register windows work. This hides
480 * the restriction from thread libraries etc. -DaveM
481 */
482 csp &= ~7UL;
483
484 distance = fp - psp;
485 rval = (csp - distance);
486 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
487 rval = 0;
488 else if (test_thread_flag(TIF_32BIT)) {
489 if (put_user(((u32)csp),
490 &(((struct reg_window32 __user *)rval)->ins[6])))
491 rval = 0;
492 } else {
493 if (put_user(((u64)csp - STACK_BIAS),
494 &(((struct reg_window __user *)rval)->ins[6])))
495 rval = 0;
496 else
497 rval = rval - STACK_BIAS;
498 }
499
500 return rval;
501 }
502
503 /* Standard stuff. */
504 static inline void shift_window_buffer(int first_win, int last_win,
505 struct thread_info *t)
506 {
507 int i;
508
509 for (i = first_win; i < last_win; i++) {
510 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
511 memcpy(&t->reg_window[i], &t->reg_window[i+1],
512 sizeof(struct reg_window));
513 }
514 }
515
516 void synchronize_user_stack(void)
517 {
518 struct thread_info *t = current_thread_info();
519 unsigned long window;
520
521 flush_user_windows();
522 if ((window = get_thread_wsaved()) != 0) {
523 int winsize = sizeof(struct reg_window);
524 int bias = 0;
525
526 if (test_thread_flag(TIF_32BIT))
527 winsize = sizeof(struct reg_window32);
528 else
529 bias = STACK_BIAS;
530
531 window -= 1;
532 do {
533 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
534 struct reg_window *rwin = &t->reg_window[window];
535
536 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
537 shift_window_buffer(window, get_thread_wsaved() - 1, t);
538 set_thread_wsaved(get_thread_wsaved() - 1);
539 }
540 } while (window--);
541 }
542 }
543
544 static void stack_unaligned(unsigned long sp)
545 {
546 siginfo_t info;
547
548 info.si_signo = SIGBUS;
549 info.si_errno = 0;
550 info.si_code = BUS_ADRALN;
551 info.si_addr = (void __user *) sp;
552 info.si_trapno = 0;
553 force_sig_info(SIGBUS, &info, current);
554 }
555
556 void fault_in_user_windows(void)
557 {
558 struct thread_info *t = current_thread_info();
559 unsigned long window;
560 int winsize = sizeof(struct reg_window);
561 int bias = 0;
562
563 if (test_thread_flag(TIF_32BIT))
564 winsize = sizeof(struct reg_window32);
565 else
566 bias = STACK_BIAS;
567
568 flush_user_windows();
569 window = get_thread_wsaved();
570
571 if (likely(window != 0)) {
572 window -= 1;
573 do {
574 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
575 struct reg_window *rwin = &t->reg_window[window];
576
577 if (unlikely(sp & 0x7UL))
578 stack_unaligned(sp);
579
580 if (unlikely(copy_to_user((char __user *)sp,
581 rwin, winsize)))
582 goto barf;
583 } while (window--);
584 }
585 set_thread_wsaved(0);
586 return;
587
588 barf:
589 set_thread_wsaved(window + 1);
590 do_exit(SIGILL);
591 }
592
593 asmlinkage long sparc_do_fork(unsigned long clone_flags,
594 unsigned long stack_start,
595 struct pt_regs *regs,
596 unsigned long stack_size)
597 {
598 int __user *parent_tid_ptr, *child_tid_ptr;
599
600 #ifdef CONFIG_COMPAT
601 if (test_thread_flag(TIF_32BIT)) {
602 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
603 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
604 } else
605 #endif
606 {
607 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
608 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
609 }
610
611 return do_fork(clone_flags, stack_start,
612 regs, stack_size,
613 parent_tid_ptr, child_tid_ptr);
614 }
615
616 /* Copy a Sparc thread. The fork() return value conventions
617 * under SunOS are nothing short of bletcherous:
618 * Parent --> %o0 == childs pid, %o1 == 0
619 * Child --> %o0 == parents pid, %o1 == 1
620 */
621 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
622 unsigned long unused,
623 struct task_struct *p, struct pt_regs *regs)
624 {
625 struct thread_info *t = task_thread_info(p);
626 char *child_trap_frame;
627
628 /* Calculate offset to stack_frame & pt_regs */
629 child_trap_frame = task_stack_page(p) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ));
630 memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ));
631
632 t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
633 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
634 t->new_child = 1;
635 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
636 t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf));
637 t->fpsaved[0] = 0;
638
639 if (regs->tstate & TSTATE_PRIV) {
640 /* Special case, if we are spawning a kernel thread from
641 * a userspace task (via KMOD, NFS, or similar) we must
642 * disable performance counters in the child because the
643 * address space and protection realm are changing.
644 */
645 if (t->flags & _TIF_PERFCTR) {
646 t->user_cntd0 = t->user_cntd1 = NULL;
647 t->pcr_reg = 0;
648 t->flags &= ~_TIF_PERFCTR;
649 }
650 t->kregs->u_regs[UREG_FP] = t->ksp;
651 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
652 flush_register_windows();
653 memcpy((void *)(t->ksp + STACK_BIAS),
654 (void *)(regs->u_regs[UREG_FP] + STACK_BIAS),
655 sizeof(struct sparc_stackf));
656 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
657 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
658 } else {
659 if (t->flags & _TIF_32BIT) {
660 sp &= 0x00000000ffffffffUL;
661 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
662 }
663 t->kregs->u_regs[UREG_FP] = sp;
664 t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
665 if (sp != regs->u_regs[UREG_FP]) {
666 unsigned long csp;
667
668 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
669 if (!csp)
670 return -EFAULT;
671 t->kregs->u_regs[UREG_FP] = csp;
672 }
673 if (t->utraps)
674 t->utraps[0]++;
675 }
676
677 /* Set the return value for the child. */
678 t->kregs->u_regs[UREG_I0] = current->pid;
679 t->kregs->u_regs[UREG_I1] = 1;
680
681 /* Set the second return value for the parent. */
682 regs->u_regs[UREG_I1] = 0;
683
684 if (clone_flags & CLONE_SETTLS)
685 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
686
687 return 0;
688 }
689
690 /*
691 * This is the mechanism for creating a new kernel thread.
692 *
693 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
694 * who haven't done an "execve()") should use this: it will work within
695 * a system call from a "real" process, but the process memory space will
696 * not be freed until both the parent and the child have exited.
697 */
698 pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
699 {
700 long retval;
701
702 /* If the parent runs before fn(arg) is called by the child,
703 * the input registers of this function can be clobbered.
704 * So we stash 'fn' and 'arg' into global registers which
705 * will not be modified by the parent.
706 */
707 __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
708 "mov %5, %%g3\n\t" /* Save ARG into global */
709 "mov %1, %%g1\n\t" /* Clone syscall nr. */
710 "mov %2, %%o0\n\t" /* Clone flags. */
711 "mov 0, %%o1\n\t" /* usp arg == 0 */
712 "t 0x6d\n\t" /* Linux/Sparc clone(). */
713 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
714 " mov %%o0, %0\n\t"
715 "jmpl %%g2, %%o7\n\t" /* Call the function. */
716 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
717 "mov %3, %%g1\n\t"
718 "t 0x6d\n\t" /* Linux/Sparc exit(). */
719 /* Notreached by child. */
720 "1:" :
721 "=r" (retval) :
722 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
723 "i" (__NR_exit), "r" (fn), "r" (arg) :
724 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
725 return retval;
726 }
727
728 /*
729 * fill in the user structure for a core dump..
730 */
731 void dump_thread(struct pt_regs * regs, struct user * dump)
732 {
733 /* Only should be used for SunOS and ancient a.out
734 * SparcLinux binaries... Not worth implementing.
735 */
736 memset(dump, 0, sizeof(struct user));
737 }
738
739 typedef struct {
740 union {
741 unsigned int pr_regs[32];
742 unsigned long pr_dregs[16];
743 } pr_fr;
744 unsigned int __unused;
745 unsigned int pr_fsr;
746 unsigned char pr_qcnt;
747 unsigned char pr_q_entrysize;
748 unsigned char pr_en;
749 unsigned int pr_q[64];
750 } elf_fpregset_t32;
751
752 /*
753 * fill in the fpu structure for a core dump.
754 */
755 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
756 {
757 unsigned long *kfpregs = current_thread_info()->fpregs;
758 unsigned long fprs = current_thread_info()->fpsaved[0];
759
760 if (test_thread_flag(TIF_32BIT)) {
761 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
762
763 if (fprs & FPRS_DL)
764 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
765 sizeof(unsigned int) * 32);
766 else
767 memset(&fpregs32->pr_fr.pr_regs[0], 0,
768 sizeof(unsigned int) * 32);
769 fpregs32->pr_qcnt = 0;
770 fpregs32->pr_q_entrysize = 8;
771 memset(&fpregs32->pr_q[0], 0,
772 (sizeof(unsigned int) * 64));
773 if (fprs & FPRS_FEF) {
774 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
775 fpregs32->pr_en = 1;
776 } else {
777 fpregs32->pr_fsr = 0;
778 fpregs32->pr_en = 0;
779 }
780 } else {
781 if(fprs & FPRS_DL)
782 memcpy(&fpregs->pr_regs[0], kfpregs,
783 sizeof(unsigned int) * 32);
784 else
785 memset(&fpregs->pr_regs[0], 0,
786 sizeof(unsigned int) * 32);
787 if(fprs & FPRS_DU)
788 memcpy(&fpregs->pr_regs[16], kfpregs+16,
789 sizeof(unsigned int) * 32);
790 else
791 memset(&fpregs->pr_regs[16], 0,
792 sizeof(unsigned int) * 32);
793 if(fprs & FPRS_FEF) {
794 fpregs->pr_fsr = current_thread_info()->xfsr[0];
795 fpregs->pr_gsr = current_thread_info()->gsr[0];
796 } else {
797 fpregs->pr_fsr = fpregs->pr_gsr = 0;
798 }
799 fpregs->pr_fprs = fprs;
800 }
801 return 1;
802 }
803
804 /*
805 * sparc_execve() executes a new program after the asm stub has set
806 * things up for us. This should basically do what I want it to.
807 */
808 asmlinkage int sparc_execve(struct pt_regs *regs)
809 {
810 int error, base = 0;
811 char *filename;
812
813 /* User register window flush is done by entry.S */
814
815 /* Check for indirect call. */
816 if (regs->u_regs[UREG_G1] == 0)
817 base = 1;
818
819 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
820 error = PTR_ERR(filename);
821 if (IS_ERR(filename))
822 goto out;
823 error = do_execve(filename,
824 (char __user * __user *)
825 regs->u_regs[base + UREG_I1],
826 (char __user * __user *)
827 regs->u_regs[base + UREG_I2], regs);
828 putname(filename);
829 if (!error) {
830 fprs_write(0);
831 current_thread_info()->xfsr[0] = 0;
832 current_thread_info()->fpsaved[0] = 0;
833 regs->tstate &= ~TSTATE_PEF;
834 task_lock(current);
835 current->ptrace &= ~PT_DTRACE;
836 task_unlock(current);
837 }
838 out:
839 return error;
840 }
841
842 unsigned long get_wchan(struct task_struct *task)
843 {
844 unsigned long pc, fp, bias = 0;
845 unsigned long thread_info_base;
846 struct reg_window *rw;
847 unsigned long ret = 0;
848 int count = 0;
849
850 if (!task || task == current ||
851 task->state == TASK_RUNNING)
852 goto out;
853
854 thread_info_base = (unsigned long) task_stack_page(task);
855 bias = STACK_BIAS;
856 fp = task_thread_info(task)->ksp + bias;
857
858 do {
859 /* Bogus frame pointer? */
860 if (fp < (thread_info_base + sizeof(struct thread_info)) ||
861 fp >= (thread_info_base + THREAD_SIZE))
862 break;
863 rw = (struct reg_window *) fp;
864 pc = rw->ins[7];
865 if (!in_sched_functions(pc)) {
866 ret = pc;
867 goto out;
868 }
869 fp = rw->ins[6] + bias;
870 } while (++count < 16);
871
872 out:
873 return ret;
874 }
Verdex Pro support