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[SPARC64]: Rewrite pci_intmap_match().
[deliverable/linux.git] / arch / sparc64 / kernel / process.c
CommitLineData
1da177e4
LT		 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>
74bf4312 47#include <asm/mmu_context.h>
1da177e4
LT		 48#include <asm/unistd.h>
49
50/* #define VERBOSE_SHOWREGS */
51
52/*
53 * Nothing special yet...
54 */
55void default_idle(void)
56{
57}
58
59#ifndef CONFIG_SMP
60
61/*
62 * the idle loop on a Sparc... ;)
63 */
64void cpu_idle(void)
65{
1da177e4
LT		 66 /* endless idle loop with no priority at all */
67 for (;;) {
68 /* If current->work.need_resched is zero we should really
69 * setup for a system wakup event and execute a shutdown
70 * instruction.
71 *
72 * But this requires writing back the contents of the
73 * L2 cache etc. so implement this later. -DaveM
74 */
75 while (!need_resched())
76 barrier();
77
5bfb5d69 78 preempt_enable_no_resched();
1da177e4 79 schedule();
5bfb5d69 80 preempt_disable();
1da177e4
LT		 81 check_pgt_cache();
82 }
1da177e4
LT		 83}
84
85#else
86
87/*
88 * the idle loop on a UltraMultiPenguin...
64c7c8f8
NP		 89 *
90 * TIF_POLLING_NRFLAG is set because we do not sleep the cpu
91 * inside of the idler task, so an interrupt is not needed
92 * to get a clean fast response.
93 *
94 * XXX Reverify this assumption... -DaveM
95 *
96 * Addendum: We do want it to do something for the signal
97 * delivery case, we detect that by just seeing
98 * if we are trying to send this to an idler or not.
1da177e4 99 */
1da177e4
LT		 100void cpu_idle(void)
101{
64c7c8f8 102 cpuinfo_sparc *cpuinfo = &local_cpu_data();
1da177e4 103 set_thread_flag(TIF_POLLING_NRFLAG);
64c7c8f8 104
1da177e4
LT		 105 while(1) {
106 if (need_resched()) {
64c7c8f8 107 cpuinfo->idle_volume = 0;
5bfb5d69 108 preempt_enable_no_resched();
1da177e4 109 schedule();
5bfb5d69 110 preempt_disable();
1da177e4
LT		 111 check_pgt_cache();
112 }
64c7c8f8 113 cpuinfo->idle_volume++;
1da177e4
LT		 114
115 /* The store ordering is so that IRQ handlers on
116 * other cpus see our increasing idleness for the buddy
117 * redistribution algorithm. -DaveM
118 */
4f07118f 119 membar_storeload_storestore();
1da177e4
LT		 120 }
121}
122
123#endif
124
125extern char reboot_command [];
126
127extern void (*prom_palette)(int);
128extern void (*prom_keyboard)(void);
129
130void machine_halt(void)
131{
132 if (!serial_console && prom_palette)
133 prom_palette (1);
134 if (prom_keyboard)
135 prom_keyboard();
136 prom_halt();
137 panic("Halt failed!");
138}
139
1da177e4
LT		 140void machine_alt_power_off(void)
141{
142 if (!serial_console && prom_palette)
143 prom_palette(1);
144 if (prom_keyboard)
145 prom_keyboard();
146 prom_halt_power_off();
147 panic("Power-off failed!");
148}
149
150void machine_restart(char * cmd)
151{
152 char *p;
153
154 p = strchr (reboot_command, '\n');
155 if (p) *p = 0;
156 if (!serial_console && prom_palette)
157 prom_palette (1);
158 if (prom_keyboard)
159 prom_keyboard();
160 if (cmd)
161 prom_reboot(cmd);
162 if (*reboot_command)
163 prom_reboot(reboot_command);
164 prom_reboot("");
165 panic("Reboot failed!");
166}
167
959a85ad 168#ifdef CONFIG_COMPAT
1da177e4
LT		 169static void show_regwindow32(struct pt_regs *regs)
170{
171 struct reg_window32 __user *rw;
172 struct reg_window32 r_w;
173 mm_segment_t old_fs;
174
175 __asm__ __volatile__ ("flushw");
176 rw = compat_ptr((unsigned)regs->u_regs[14]);
177 old_fs = get_fs();
178 set_fs (USER_DS);
179 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
180 set_fs (old_fs);
181 return;
182 }
183
184 set_fs (old_fs);
185 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
186 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
187 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
188 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
189 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
190 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
191 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
192 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
193}
959a85ad
DM		 194#else
195#define show_regwindow32(regs) do { } while (0)
196#endif
1da177e4
LT		 197
198static void show_regwindow(struct pt_regs *regs)
199{
200 struct reg_window __user *rw;
201 struct reg_window *rwk;
202 struct reg_window r_w;
203 mm_segment_t old_fs;
204
205 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
206 __asm__ __volatile__ ("flushw");
207 rw = (struct reg_window __user *)
208 (regs->u_regs[14] + STACK_BIAS);
209 rwk = (struct reg_window *)
210 (regs->u_regs[14] + STACK_BIAS);
211 if (!(regs->tstate & TSTATE_PRIV)) {
212 old_fs = get_fs();
213 set_fs (USER_DS);
214 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
215 set_fs (old_fs);
216 return;
217 }
218 rwk = &r_w;
219 set_fs (old_fs);
220 }
221 } else {
222 show_regwindow32(regs);
223 return;
224 }
225 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
226 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
227 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
228 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
229 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
230 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
231 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
232 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
233 if (regs->tstate & TSTATE_PRIV)
234 print_symbol("I7: <%s>\n", rwk->ins[7]);
235}
236
237void show_stackframe(struct sparc_stackf *sf)
238{
239 unsigned long size;
240 unsigned long *stk;
241 int i;
242
243 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n"
244 "l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
245 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3],
246 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
247 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n"
248 "i4: %016lx i5: %016lx fp: %016lx ret_pc: %016lx\n",
249 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3],
250 sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc);
251 printk("sp: %016lx x0: %016lx x1: %016lx x2: %016lx\n"
252 "x3: %016lx x4: %016lx x5: %016lx xx: %016lx\n",
253 (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1],
254 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
255 sf->xxargs[0]);
256 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
257 size -= STACKFRAME_SZ;
258 stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ);
259 i = 0;
260 do {
261 printk("s%d: %016lx\n", i++, *stk++);
262 } while ((size -= sizeof(unsigned long)));
263}
264
265void show_stackframe32(struct sparc_stackf32 *sf)
266{
267 unsigned long size;
268 unsigned *stk;
269 int i;
270
271 printk("l0: %08x l1: %08x l2: %08x l3: %08x\n",
272 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3]);
273 printk("l4: %08x l5: %08x l6: %08x l7: %08x\n",
274 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
275 printk("i0: %08x i1: %08x i2: %08x i3: %08x\n",
276 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3]);
277 printk("i4: %08x i5: %08x fp: %08x ret_pc: %08x\n",
278 sf->ins[4], sf->ins[5], sf->fp, sf->callers_pc);
279 printk("sp: %08x x0: %08x x1: %08x x2: %08x\n"
280 "x3: %08x x4: %08x x5: %08x xx: %08x\n",
281 sf->structptr, sf->xargs[0], sf->xargs[1],
282 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
283 sf->xxargs[0]);
284 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
285 size -= STACKFRAME32_SZ;
286 stk = (unsigned *)((unsigned long)sf + STACKFRAME32_SZ);
287 i = 0;
288 do {
289 printk("s%d: %08x\n", i++, *stk++);
290 } while ((size -= sizeof(unsigned)));
291}
292
293#ifdef CONFIG_SMP
294static DEFINE_SPINLOCK(regdump_lock);
295#endif
296
297void __show_regs(struct pt_regs * regs)
298{
299#ifdef CONFIG_SMP
300 unsigned long flags;
301
302 /* Protect against xcall ipis which might lead to livelock on the lock */
303 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
304 "wrpr %0, %1, %%pstate"
305 : "=r" (flags)
306 : "i" (PSTATE_IE));
307 spin_lock(&regdump_lock);
308#endif
309 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
310 regs->tpc, regs->tnpc, regs->y, print_tainted());
311 print_symbol("TPC: <%s>\n", regs->tpc);
312 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
313 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
314 regs->u_regs[3]);
315 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
316 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
317 regs->u_regs[7]);
318 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
319 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
320 regs->u_regs[11]);
321 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
322 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
323 regs->u_regs[15]);
324 print_symbol("RPC: <%s>\n", regs->u_regs[15]);
325 show_regwindow(regs);
326#ifdef CONFIG_SMP
327 spin_unlock(&regdump_lock);
328 __asm__ __volatile__("wrpr %0, 0, %%pstate"
329 : : "r" (flags));
330#endif
331}
332
333#ifdef VERBOSE_SHOWREGS
334static void idump_from_user (unsigned int *pc)
335{
336 int i;
337 int code;
338
339 if((((unsigned long) pc) & 3))
340 return;
341
342 pc -= 3;
343 for(i = -3; i < 6; i++) {
344 get_user(code, pc);
345 printk("%c%08x%c",i?' ':'<',code,i?' ':'>');
346 pc++;
347 }
348 printk("\n");
349}
350#endif
351
352void show_regs(struct pt_regs *regs)
353{
354#ifdef VERBOSE_SHOWREGS
355 extern long etrap, etraptl1;
356#endif
357 __show_regs(regs);
358#ifdef CONFIG_SMP
359 {
360 extern void smp_report_regs(void);
361
362 smp_report_regs();
363 }
364#endif
365
366#ifdef VERBOSE_SHOWREGS
367 if (regs->tpc >= &etrap && regs->tpc < &etraptl1 &&
368 regs->u_regs[14] >= (long)current - PAGE_SIZE &&
369 regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) {
370 printk ("*********parent**********\n");
371 __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF));
372 idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc);
373 printk ("*********endpar**********\n");
374 }
375#endif
376}
377
378void show_regs32(struct pt_regs32 *regs)
379{
380 printk("PSR: %08x PC: %08x NPC: %08x Y: %08x %s\n", regs->psr,
381 regs->pc, regs->npc, regs->y, print_tainted());
382 printk("g0: %08x g1: %08x g2: %08x g3: %08x ",
383 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
384 regs->u_regs[3]);
385 printk("g4: %08x g5: %08x g6: %08x g7: %08x\n",
386 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
387 regs->u_regs[7]);
388 printk("o0: %08x o1: %08x o2: %08x o3: %08x ",
389 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
390 regs->u_regs[11]);
391 printk("o4: %08x o5: %08x sp: %08x ret_pc: %08x\n",
392 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
393 regs->u_regs[15]);
394}
395
396unsigned long thread_saved_pc(struct task_struct *tsk)
397{
f3169641 398 struct thread_info *ti = task_thread_info(tsk);
1da177e4
LT		 399 unsigned long ret = 0xdeadbeefUL;
400
401 if (ti && ti->ksp) {
402 unsigned long *sp;
403 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
404 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
405 sp[14]) {
406 unsigned long *fp;
407 fp = (unsigned long *)(sp[14] + STACK_BIAS);
408 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
409 ret = fp[15];
410 }
411 }
412 return ret;
413}
414
415/* Free current thread data structures etc.. */
416void exit_thread(void)
417{
418 struct thread_info *t = current_thread_info();
419
420 if (t->utraps) {
421 if (t->utraps[0] < 2)
422 kfree (t->utraps);
423 else
424 t->utraps[0]--;
425 }
426
427 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
428 t->user_cntd0 = t->user_cntd1 = NULL;
429 t->pcr_reg = 0;
430 write_pcr(0);
431 }
432}
433
434void flush_thread(void)
435{
436 struct thread_info *t = current_thread_info();
74bf4312 437 struct mm_struct *mm;
1da177e4
LT		 438
439 if (t->flags & _TIF_ABI_PENDING)
440 t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT);
441
74bf4312
DM		 442 mm = t->task->mm;
443 if (mm)
98c5584c 444 tsb_context_switch(mm);
1da177e4 445
1da177e4
LT		 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... */
466static 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. */
504static 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
516void 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
314ef685
DM		 544static 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
1da177e4
LT		 556void 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
314ef685 571 if (likely(window != 0)) {
1da177e4
LT		 572 window -= 1;
573 do {
574 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
575 struct reg_window *rwin = &t->reg_window[window];
576
314ef685
DM		 577 if (unlikely(sp & 0x7UL))
578 stack_unaligned(sp);
579
580 if (unlikely(copy_to_user((char __user *)sp,
581 rwin, winsize)))
1da177e4
LT		 582 goto barf;
583 } while (window--);
584 }
585 set_thread_wsaved(0);
586 return;
587
588barf:
589 set_thread_wsaved(window + 1);
590 do_exit(SIGILL);
591}
592
593asmlinkage 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 */
621int 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{
ee3eea16 625 struct thread_info *t = task_thread_info(p);
1da177e4
LT		 626 char *child_trap_frame;
627
1da177e4 628 /* Calculate offset to stack_frame & pt_regs */
ee3eea16 629 child_trap_frame = task_stack_page(p) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ));
1da177e4
LT		 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))) |
1da177e4 633 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
db7d9a4e 634 t->new_child = 1;
1da177e4
LT		 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 free'd until both the parent and the child have exited.
697 */
698pid_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 */
731void 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
739typedef 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 */
755int 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 */
808asmlinkage 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 }
838out:
839 return error;
840}
841
842unsigned 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
ee3eea16 854 thread_info_base = (unsigned long) task_stack_page(task);
1da177e4 855 bias = STACK_BIAS;
f3169641 856 fp = task_thread_info(task)->ksp + bias;
1da177e4
LT		 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
872out:
873 return ret;
874}
Linux kernel - Deliverables
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