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[mirror_ubuntu-artful-kernel.git] / arch / sparc64 / kernel / process.c
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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
1da177e4
LT		 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>
4e950f6f 21#include <linux/fs.h>
1da177e4 22#include <linux/smp.h>
1da177e4
LT		 23#include <linux/stddef.h>
24#include <linux/ptrace.h>
25#include <linux/slab.h>
26#include <linux/user.h>
1da177e4
LT		 27#include <linux/reboot.h>
28#include <linux/delay.h>
29#include <linux/compat.h>
038cb01e 30#include <linux/tick.h>
1da177e4 31#include <linux/init.h>
e0204409 32#include <linux/cpu.h>
1da177e4
LT		 33
34#include <asm/oplib.h>
35#include <asm/uaccess.h>
36#include <asm/system.h>
37#include <asm/page.h>
38#include <asm/pgalloc.h>
39#include <asm/pgtable.h>
40#include <asm/processor.h>
41#include <asm/pstate.h>
42#include <asm/elf.h>
43#include <asm/fpumacro.h>
44#include <asm/head.h>
45#include <asm/cpudata.h>
74bf4312 46#include <asm/mmu_context.h>
1da177e4 47#include <asm/unistd.h>
30c91d57 48#include <asm/hypervisor.h>
22d6a1cb 49#include <asm/sstate.h>
1da177e4
LT		 50
51/* #define VERBOSE_SHOWREGS */
52
e0204409 53static void sparc64_yield(int cpu)
1da177e4 54{
30c91d57
DM		 55 if (tlb_type != hypervisor)
56 return;
57
58 clear_thread_flag(TIF_POLLING_NRFLAG);
59 smp_mb__after_clear_bit();
60
e0204409 61 while (!need_resched() && !cpu_is_offline(cpu)) {
30c91d57
DM		 62 unsigned long pstate;
63
64 /* Disable interrupts. */
65 __asm__ __volatile__(
66 "rdpr %%pstate, %0\n\t"
67 "andn %0, %1, %0\n\t"
68 "wrpr %0, %%g0, %%pstate"
69 : "=&r" (pstate)
70 : "i" (PSTATE_IE));
71
e0204409 72 if (!need_resched() && !cpu_is_offline(cpu))
30c91d57
DM		 73 sun4v_cpu_yield();
74
75 /* Re-enable interrupts. */
76 __asm__ __volatile__(
77 "rdpr %%pstate, %0\n\t"
78 "or %0, %1, %0\n\t"
79 "wrpr %0, %%g0, %%pstate"
80 : "=&r" (pstate)
81 : "i" (PSTATE_IE));
1da177e4 82 }
1da177e4 83
30c91d57
DM		 84 set_thread_flag(TIF_POLLING_NRFLAG);
85}
1da177e4 86
30c91d57 87/* The idle loop on sparc64. */
1da177e4
LT		 88void cpu_idle(void)
89{
e0204409
DM		 90 int cpu = smp_processor_id();
91
1da177e4 92 set_thread_flag(TIF_POLLING_NRFLAG);
64c7c8f8 93
1da177e4 94 while(1) {
038cb01e 95 tick_nohz_stop_sched_tick();
e0204409
DM		 96
97 while (!need_resched() && !cpu_is_offline(cpu))
98 sparc64_yield(cpu);
99
038cb01e
DM		 100 tick_nohz_restart_sched_tick();
101
102 preempt_enable_no_resched();
e0204409
DM		 103
104#ifdef CONFIG_HOTPLUG_CPU
105 if (cpu_is_offline(cpu))
106 cpu_play_dead();
107#endif
108
038cb01e
DM		 109 schedule();
110 preempt_disable();
1da177e4
LT		 111 }
112}
113
1da177e4
LT		 114extern char reboot_command [];
115
1da177e4
LT		 116void machine_halt(void)
117{
22d6a1cb 118 sstate_halt();
1da177e4
LT		 119 prom_halt();
120 panic("Halt failed!");
121}
122
1da177e4
LT		 123void machine_alt_power_off(void)
124{
22d6a1cb 125 sstate_poweroff();
1da177e4
LT		 126 prom_halt_power_off();
127 panic("Power-off failed!");
128}
129
130void machine_restart(char * cmd)
131{
132 char *p;
133
22d6a1cb 134 sstate_reboot();
1da177e4
LT		 135 p = strchr (reboot_command, '\n');
136 if (p) *p = 0;
1da177e4
LT		 137 if (cmd)
138 prom_reboot(cmd);
139 if (*reboot_command)
140 prom_reboot(reboot_command);
141 prom_reboot("");
142 panic("Reboot failed!");
143}
144
959a85ad 145#ifdef CONFIG_COMPAT
1da177e4
LT		 146static void show_regwindow32(struct pt_regs *regs)
147{
148 struct reg_window32 __user *rw;
149 struct reg_window32 r_w;
150 mm_segment_t old_fs;
151
152 __asm__ __volatile__ ("flushw");
153 rw = compat_ptr((unsigned)regs->u_regs[14]);
154 old_fs = get_fs();
155 set_fs (USER_DS);
156 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
157 set_fs (old_fs);
158 return;
159 }
160
161 set_fs (old_fs);
162 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
163 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
164 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
165 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
166 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
167 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
168 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
169 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
170}
959a85ad
DM		 171#else
172#define show_regwindow32(regs) do { } while (0)
173#endif
1da177e4
LT		 174
175static void show_regwindow(struct pt_regs *regs)
176{
177 struct reg_window __user *rw;
178 struct reg_window *rwk;
179 struct reg_window r_w;
180 mm_segment_t old_fs;
181
182 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
183 __asm__ __volatile__ ("flushw");
184 rw = (struct reg_window __user *)
185 (regs->u_regs[14] + STACK_BIAS);
186 rwk = (struct reg_window *)
187 (regs->u_regs[14] + STACK_BIAS);
188 if (!(regs->tstate & TSTATE_PRIV)) {
189 old_fs = get_fs();
190 set_fs (USER_DS);
191 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
192 set_fs (old_fs);
193 return;
194 }
195 rwk = &r_w;
196 set_fs (old_fs);
197 }
198 } else {
199 show_regwindow32(regs);
200 return;
201 }
202 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
203 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
204 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
205 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
206 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
207 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
208 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
209 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
210 if (regs->tstate & TSTATE_PRIV)
211 print_symbol("I7: <%s>\n", rwk->ins[7]);
212}
213
214void show_stackframe(struct sparc_stackf *sf)
215{
216 unsigned long size;
217 unsigned long *stk;
218 int i;
219
220 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n"
221 "l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
222 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3],
223 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
224 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n"
225 "i4: %016lx i5: %016lx fp: %016lx ret_pc: %016lx\n",
226 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3],
227 sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc);
228 printk("sp: %016lx x0: %016lx x1: %016lx x2: %016lx\n"
229 "x3: %016lx x4: %016lx x5: %016lx xx: %016lx\n",
230 (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1],
231 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
232 sf->xxargs[0]);
233 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
234 size -= STACKFRAME_SZ;
235 stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ);
236 i = 0;
237 do {
238 printk("s%d: %016lx\n", i++, *stk++);
239 } while ((size -= sizeof(unsigned long)));
240}
241
242void show_stackframe32(struct sparc_stackf32 *sf)
243{
244 unsigned long size;
245 unsigned *stk;
246 int i;
247
248 printk("l0: %08x l1: %08x l2: %08x l3: %08x\n",
249 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3]);
250 printk("l4: %08x l5: %08x l6: %08x l7: %08x\n",
251 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
252 printk("i0: %08x i1: %08x i2: %08x i3: %08x\n",
253 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3]);
254 printk("i4: %08x i5: %08x fp: %08x ret_pc: %08x\n",
255 sf->ins[4], sf->ins[5], sf->fp, sf->callers_pc);
256 printk("sp: %08x x0: %08x x1: %08x x2: %08x\n"
257 "x3: %08x x4: %08x x5: %08x xx: %08x\n",
258 sf->structptr, sf->xargs[0], sf->xargs[1],
259 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
260 sf->xxargs[0]);
261 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
262 size -= STACKFRAME32_SZ;
263 stk = (unsigned *)((unsigned long)sf + STACKFRAME32_SZ);
264 i = 0;
265 do {
266 printk("s%d: %08x\n", i++, *stk++);
267 } while ((size -= sizeof(unsigned)));
268}
269
270#ifdef CONFIG_SMP
271static DEFINE_SPINLOCK(regdump_lock);
272#endif
273
274void __show_regs(struct pt_regs * regs)
275{
276#ifdef CONFIG_SMP
277 unsigned long flags;
278
279 /* Protect against xcall ipis which might lead to livelock on the lock */
280 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
281 "wrpr %0, %1, %%pstate"
282 : "=r" (flags)
283 : "i" (PSTATE_IE));
284 spin_lock(&regdump_lock);
285#endif
286 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
287 regs->tpc, regs->tnpc, regs->y, print_tainted());
288 print_symbol("TPC: <%s>\n", regs->tpc);
289 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
290 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
291 regs->u_regs[3]);
292 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
293 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
294 regs->u_regs[7]);
295 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
296 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
297 regs->u_regs[11]);
298 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
299 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
300 regs->u_regs[15]);
301 print_symbol("RPC: <%s>\n", regs->u_regs[15]);
302 show_regwindow(regs);
303#ifdef CONFIG_SMP
304 spin_unlock(&regdump_lock);
305 __asm__ __volatile__("wrpr %0, 0, %%pstate"
306 : : "r" (flags));
307#endif
308}
309
310#ifdef VERBOSE_SHOWREGS
311static void idump_from_user (unsigned int *pc)
312{
313 int i;
314 int code;
315
316 if((((unsigned long) pc) & 3))
317 return;
318
319 pc -= 3;
320 for(i = -3; i < 6; i++) {
321 get_user(code, pc);
322 printk("%c%08x%c",i?' ':'<',code,i?' ':'>');
323 pc++;
324 }
325 printk("\n");
326}
327#endif
328
329void show_regs(struct pt_regs *regs)
330{
331#ifdef VERBOSE_SHOWREGS
332 extern long etrap, etraptl1;
333#endif
334 __show_regs(regs);
19a0d585 335#if 0
1da177e4
LT		 336#ifdef CONFIG_SMP
337 {
338 extern void smp_report_regs(void);
339
340 smp_report_regs();
341 }
342#endif
19a0d585 343#endif
1da177e4
LT		 344
345#ifdef VERBOSE_SHOWREGS
346 if (regs->tpc >= &etrap && regs->tpc < &etraptl1 &&
347 regs->u_regs[14] >= (long)current - PAGE_SIZE &&
348 regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) {
349 printk ("*********parent**********\n");
350 __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF));
351 idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc);
352 printk ("*********endpar**********\n");
353 }
354#endif
355}
356
357void show_regs32(struct pt_regs32 *regs)
358{
359 printk("PSR: %08x PC: %08x NPC: %08x Y: %08x %s\n", regs->psr,
360 regs->pc, regs->npc, regs->y, print_tainted());
361 printk("g0: %08x g1: %08x g2: %08x g3: %08x ",
362 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
363 regs->u_regs[3]);
364 printk("g4: %08x g5: %08x g6: %08x g7: %08x\n",
365 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
366 regs->u_regs[7]);
367 printk("o0: %08x o1: %08x o2: %08x o3: %08x ",
368 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
369 regs->u_regs[11]);
370 printk("o4: %08x o5: %08x sp: %08x ret_pc: %08x\n",
371 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
372 regs->u_regs[15]);
373}
374
375unsigned long thread_saved_pc(struct task_struct *tsk)
376{
f3169641 377 struct thread_info *ti = task_thread_info(tsk);
1da177e4
LT		 378 unsigned long ret = 0xdeadbeefUL;
379
380 if (ti && ti->ksp) {
381 unsigned long *sp;
382 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
383 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
384 sp[14]) {
385 unsigned long *fp;
386 fp = (unsigned long *)(sp[14] + STACK_BIAS);
387 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
388 ret = fp[15];
389 }
390 }
391 return ret;
392}
393
394/* Free current thread data structures etc.. */
395void exit_thread(void)
396{
397 struct thread_info *t = current_thread_info();
398
399 if (t->utraps) {
400 if (t->utraps[0] < 2)
401 kfree (t->utraps);
402 else
403 t->utraps[0]--;
404 }
405
406 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
407 t->user_cntd0 = t->user_cntd1 = NULL;
408 t->pcr_reg = 0;
409 write_pcr(0);
410 }
411}
412
413void flush_thread(void)
414{
415 struct thread_info *t = current_thread_info();
74bf4312 416 struct mm_struct *mm;
1da177e4 417
c0a79b22
MD		 418 if (test_ti_thread_flag(t, TIF_ABI_PENDING)) {
419 clear_ti_thread_flag(t, TIF_ABI_PENDING);
420 if (test_ti_thread_flag(t, TIF_32BIT))
421 clear_ti_thread_flag(t, TIF_32BIT);
422 else
423 set_ti_thread_flag(t, TIF_32BIT);
424 }
1da177e4 425
74bf4312
DM		 426 mm = t->task->mm;
427 if (mm)
98c5584c 428 tsb_context_switch(mm);
1da177e4 429
1da177e4
LT		 430 set_thread_wsaved(0);
431
432 /* Turn off performance counters if on. */
433 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
434 t->user_cntd0 = t->user_cntd1 = NULL;
435 t->pcr_reg = 0;
436 write_pcr(0);
437 }
438
439 /* Clear FPU register state. */
440 t->fpsaved[0] = 0;
441
442 if (get_thread_current_ds() != ASI_AIUS)
443 set_fs(USER_DS);
444
445 /* Init new signal delivery disposition. */
446 clear_thread_flag(TIF_NEWSIGNALS);
447}
448
449/* It's a bit more tricky when 64-bit tasks are involved... */
450static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
451{
452 unsigned long fp, distance, rval;
453
454 if (!(test_thread_flag(TIF_32BIT))) {
455 csp += STACK_BIAS;
456 psp += STACK_BIAS;
457 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
458 fp += STACK_BIAS;
459 } else
460 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
461
462 /* Now 8-byte align the stack as this is mandatory in the
463 * Sparc ABI due to how register windows work. This hides
464 * the restriction from thread libraries etc. -DaveM
465 */
466 csp &= ~7UL;
467
468 distance = fp - psp;
469 rval = (csp - distance);
470 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
471 rval = 0;
472 else if (test_thread_flag(TIF_32BIT)) {
473 if (put_user(((u32)csp),
474 &(((struct reg_window32 __user *)rval)->ins[6])))
475 rval = 0;
476 } else {
477 if (put_user(((u64)csp - STACK_BIAS),
478 &(((struct reg_window __user *)rval)->ins[6])))
479 rval = 0;
480 else
481 rval = rval - STACK_BIAS;
482 }
483
484 return rval;
485}
486
487/* Standard stuff. */
488static inline void shift_window_buffer(int first_win, int last_win,
489 struct thread_info *t)
490{
491 int i;
492
493 for (i = first_win; i < last_win; i++) {
494 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
495 memcpy(&t->reg_window[i], &t->reg_window[i+1],
496 sizeof(struct reg_window));
497 }
498}
499
500void synchronize_user_stack(void)
501{
502 struct thread_info *t = current_thread_info();
503 unsigned long window;
504
505 flush_user_windows();
506 if ((window = get_thread_wsaved()) != 0) {
507 int winsize = sizeof(struct reg_window);
508 int bias = 0;
509
510 if (test_thread_flag(TIF_32BIT))
511 winsize = sizeof(struct reg_window32);
512 else
513 bias = STACK_BIAS;
514
515 window -= 1;
516 do {
517 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
518 struct reg_window *rwin = &t->reg_window[window];
519
520 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
521 shift_window_buffer(window, get_thread_wsaved() - 1, t);
522 set_thread_wsaved(get_thread_wsaved() - 1);
523 }
524 } while (window--);
525 }
526}
527
314ef685
DM		 528static void stack_unaligned(unsigned long sp)
529{
530 siginfo_t info;
531
532 info.si_signo = SIGBUS;
533 info.si_errno = 0;
534 info.si_code = BUS_ADRALN;
535 info.si_addr = (void __user *) sp;
536 info.si_trapno = 0;
537 force_sig_info(SIGBUS, &info, current);
538}
539
1da177e4
LT		 540void fault_in_user_windows(void)
541{
542 struct thread_info *t = current_thread_info();
543 unsigned long window;
544 int winsize = sizeof(struct reg_window);
545 int bias = 0;
546
547 if (test_thread_flag(TIF_32BIT))
548 winsize = sizeof(struct reg_window32);
549 else
550 bias = STACK_BIAS;
551
552 flush_user_windows();
553 window = get_thread_wsaved();
554
314ef685 555 if (likely(window != 0)) {
1da177e4
LT		 556 window -= 1;
557 do {
558 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
559 struct reg_window *rwin = &t->reg_window[window];
560
314ef685
DM		 561 if (unlikely(sp & 0x7UL))
562 stack_unaligned(sp);
563
564 if (unlikely(copy_to_user((char __user *)sp,
565 rwin, winsize)))
1da177e4
LT		 566 goto barf;
567 } while (window--);
568 }
569 set_thread_wsaved(0);
570 return;
571
572barf:
573 set_thread_wsaved(window + 1);
574 do_exit(SIGILL);
575}
576
577asmlinkage long sparc_do_fork(unsigned long clone_flags,
578 unsigned long stack_start,
579 struct pt_regs *regs,
580 unsigned long stack_size)
581{
582 int __user *parent_tid_ptr, *child_tid_ptr;
583
584#ifdef CONFIG_COMPAT
585 if (test_thread_flag(TIF_32BIT)) {
586 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
587 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
588 } else
589#endif
590 {
591 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
592 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
593 }
594
595 return do_fork(clone_flags, stack_start,
596 regs, stack_size,
597 parent_tid_ptr, child_tid_ptr);
598}
599
600/* Copy a Sparc thread. The fork() return value conventions
601 * under SunOS are nothing short of bletcherous:
602 * Parent --> %o0 == childs pid, %o1 == 0
603 * Child --> %o0 == parents pid, %o1 == 1
604 */
605int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
606 unsigned long unused,
607 struct task_struct *p, struct pt_regs *regs)
608{
ee3eea16 609 struct thread_info *t = task_thread_info(p);
1da177e4
LT		 610 char *child_trap_frame;
611
1da177e4 612 /* Calculate offset to stack_frame & pt_regs */
ee3eea16 613 child_trap_frame = task_stack_page(p) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ));
1da177e4
LT		 614 memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ));
615
616 t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
1da177e4 617 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
db7d9a4e 618 t->new_child = 1;
1da177e4
LT		 619 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
620 t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf));
621 t->fpsaved[0] = 0;
622
623 if (regs->tstate & TSTATE_PRIV) {
624 /* Special case, if we are spawning a kernel thread from
625 * a userspace task (via KMOD, NFS, or similar) we must
626 * disable performance counters in the child because the
627 * address space and protection realm are changing.
628 */
629 if (t->flags & _TIF_PERFCTR) {
630 t->user_cntd0 = t->user_cntd1 = NULL;
631 t->pcr_reg = 0;
632 t->flags &= ~_TIF_PERFCTR;
633 }
634 t->kregs->u_regs[UREG_FP] = t->ksp;
635 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
636 flush_register_windows();
637 memcpy((void *)(t->ksp + STACK_BIAS),
638 (void *)(regs->u_regs[UREG_FP] + STACK_BIAS),
639 sizeof(struct sparc_stackf));
640 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
641 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
642 } else {
643 if (t->flags & _TIF_32BIT) {
644 sp &= 0x00000000ffffffffUL;
645 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
646 }
647 t->kregs->u_regs[UREG_FP] = sp;
648 t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
649 if (sp != regs->u_regs[UREG_FP]) {
650 unsigned long csp;
651
652 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
653 if (!csp)
654 return -EFAULT;
655 t->kregs->u_regs[UREG_FP] = csp;
656 }
657 if (t->utraps)
658 t->utraps[0]++;
659 }
660
661 /* Set the return value for the child. */
662 t->kregs->u_regs[UREG_I0] = current->pid;
663 t->kregs->u_regs[UREG_I1] = 1;
664
665 /* Set the second return value for the parent. */
666 regs->u_regs[UREG_I1] = 0;
667
668 if (clone_flags & CLONE_SETTLS)
669 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
670
671 return 0;
672}
673
674/*
675 * This is the mechanism for creating a new kernel thread.
676 *
677 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
678 * who haven't done an "execve()") should use this: it will work within
679 * a system call from a "real" process, but the process memory space will
e5dd42e4 680 * not be freed until both the parent and the child have exited.
1da177e4
LT		 681 */
682pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
683{
684 long retval;
685
686 /* If the parent runs before fn(arg) is called by the child,
687 * the input registers of this function can be clobbered.
688 * So we stash 'fn' and 'arg' into global registers which
689 * will not be modified by the parent.
690 */
691 __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
692 "mov %5, %%g3\n\t" /* Save ARG into global */
693 "mov %1, %%g1\n\t" /* Clone syscall nr. */
694 "mov %2, %%o0\n\t" /* Clone flags. */
695 "mov 0, %%o1\n\t" /* usp arg == 0 */
696 "t 0x6d\n\t" /* Linux/Sparc clone(). */
697 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
698 " mov %%o0, %0\n\t"
699 "jmpl %%g2, %%o7\n\t" /* Call the function. */
700 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
701 "mov %3, %%g1\n\t"
702 "t 0x6d\n\t" /* Linux/Sparc exit(). */
703 /* Notreached by child. */
704 "1:" :
705 "=r" (retval) :
706 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
707 "i" (__NR_exit), "r" (fn), "r" (arg) :
708 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
709 return retval;
710}
711
1da177e4
LT		 712typedef struct {
713 union {
714 unsigned int pr_regs[32];
715 unsigned long pr_dregs[16];
716 } pr_fr;
717 unsigned int __unused;
718 unsigned int pr_fsr;
719 unsigned char pr_qcnt;
720 unsigned char pr_q_entrysize;
721 unsigned char pr_en;
722 unsigned int pr_q[64];
723} elf_fpregset_t32;
724
725/*
726 * fill in the fpu structure for a core dump.
727 */
728int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
729{
730 unsigned long *kfpregs = current_thread_info()->fpregs;
731 unsigned long fprs = current_thread_info()->fpsaved[0];
732
733 if (test_thread_flag(TIF_32BIT)) {
734 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
735
736 if (fprs & FPRS_DL)
737 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
738 sizeof(unsigned int) * 32);
739 else
740 memset(&fpregs32->pr_fr.pr_regs[0], 0,
741 sizeof(unsigned int) * 32);
742 fpregs32->pr_qcnt = 0;
743 fpregs32->pr_q_entrysize = 8;
744 memset(&fpregs32->pr_q[0], 0,
745 (sizeof(unsigned int) * 64));
746 if (fprs & FPRS_FEF) {
747 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
748 fpregs32->pr_en = 1;
749 } else {
750 fpregs32->pr_fsr = 0;
751 fpregs32->pr_en = 0;
752 }
753 } else {
754 if(fprs & FPRS_DL)
755 memcpy(&fpregs->pr_regs[0], kfpregs,
756 sizeof(unsigned int) * 32);
757 else
758 memset(&fpregs->pr_regs[0], 0,
759 sizeof(unsigned int) * 32);
760 if(fprs & FPRS_DU)
761 memcpy(&fpregs->pr_regs[16], kfpregs+16,
762 sizeof(unsigned int) * 32);
763 else
764 memset(&fpregs->pr_regs[16], 0,
765 sizeof(unsigned int) * 32);
766 if(fprs & FPRS_FEF) {
767 fpregs->pr_fsr = current_thread_info()->xfsr[0];
768 fpregs->pr_gsr = current_thread_info()->gsr[0];
769 } else {
770 fpregs->pr_fsr = fpregs->pr_gsr = 0;
771 }
772 fpregs->pr_fprs = fprs;
773 }
774 return 1;
775}
776
777/*
778 * sparc_execve() executes a new program after the asm stub has set
779 * things up for us. This should basically do what I want it to.
780 */
781asmlinkage int sparc_execve(struct pt_regs *regs)
782{
783 int error, base = 0;
784 char *filename;
785
786 /* User register window flush is done by entry.S */
787
788 /* Check for indirect call. */
789 if (regs->u_regs[UREG_G1] == 0)
790 base = 1;
791
792 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
793 error = PTR_ERR(filename);
794 if (IS_ERR(filename))
795 goto out;
796 error = do_execve(filename,
797 (char __user * __user *)
798 regs->u_regs[base + UREG_I1],
799 (char __user * __user *)
800 regs->u_regs[base + UREG_I2], regs);
801 putname(filename);
802 if (!error) {
803 fprs_write(0);
804 current_thread_info()->xfsr[0] = 0;
805 current_thread_info()->fpsaved[0] = 0;
806 regs->tstate &= ~TSTATE_PEF;
807 task_lock(current);
808 current->ptrace &= ~PT_DTRACE;
809 task_unlock(current);
810 }
811out:
812 return error;
813}
814
815unsigned long get_wchan(struct task_struct *task)
816{
817 unsigned long pc, fp, bias = 0;
818 unsigned long thread_info_base;
819 struct reg_window *rw;
820 unsigned long ret = 0;
821 int count = 0;
822
823 if (!task || task == current ||
824 task->state == TASK_RUNNING)
825 goto out;
826
ee3eea16 827 thread_info_base = (unsigned long) task_stack_page(task);
1da177e4 828 bias = STACK_BIAS;
f3169641 829 fp = task_thread_info(task)->ksp + bias;
1da177e4
LT		 830
831 do {
832 /* Bogus frame pointer? */
833 if (fp < (thread_info_base + sizeof(struct thread_info)) ||
834 fp >= (thread_info_base + THREAD_SIZE))
835 break;
836 rw = (struct reg_window *) fp;
837 pc = rw->ins[7];
838 if (!in_sched_functions(pc)) {
839 ret = pc;
840 goto out;
841 }
842 fp = rw->ins[6] + bias;
843 } while (++count < 16);
844
845out:
846 return ret;
847}
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