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sched: retune wake granularity
[wrt350n-kernel.git] / arch / sparc64 / kernel / process.c
blobe116e38b160ec3cd9a9b8a5aaecfef2ff2d659db
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/reboot.h>
28 #include <linux/delay.h>
29 #include <linux/compat.h>
30 #include <linux/tick.h>
31 #include <linux/init.h>
32 #include <linux/cpu.h>
33 #include <linux/elfcore.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 #include <asm/reboot.h>
52 #include <asm/syscalls.h>
53
54 /* #define VERBOSE_SHOWREGS */
55
56 static void sparc64_yield(int cpu)
57 {
58 if (tlb_type != hypervisor)
59 return;
60
61 clear_thread_flag(TIF_POLLING_NRFLAG);
62 smp_mb__after_clear_bit();
63
64 while (!need_resched() && !cpu_is_offline(cpu)) {
65 unsigned long pstate;
66
67 /* Disable interrupts. */
68 __asm__ __volatile__(
69 "rdpr %%pstate, %0\n\t"
70 "andn %0, %1, %0\n\t"
71 "wrpr %0, %%g0, %%pstate"
72 : "=&r" (pstate)
73 : "i" (PSTATE_IE));
74
75 if (!need_resched() && !cpu_is_offline(cpu))
76 sun4v_cpu_yield();
77
78 /* Re-enable interrupts. */
79 __asm__ __volatile__(
80 "rdpr %%pstate, %0\n\t"
81 "or %0, %1, %0\n\t"
82 "wrpr %0, %%g0, %%pstate"
83 : "=&r" (pstate)
84 : "i" (PSTATE_IE));
85 }
86
87 set_thread_flag(TIF_POLLING_NRFLAG);
88 }
89
90 /* The idle loop on sparc64. */
91 void cpu_idle(void)
92 {
93 int cpu = smp_processor_id();
94
95 set_thread_flag(TIF_POLLING_NRFLAG);
96
97 while(1) {
98 tick_nohz_stop_sched_tick();
99
100 while (!need_resched() && !cpu_is_offline(cpu))
101 sparc64_yield(cpu);
102
103 tick_nohz_restart_sched_tick();
104
105 preempt_enable_no_resched();
106
107 #ifdef CONFIG_HOTPLUG_CPU
108 if (cpu_is_offline(cpu))
109 cpu_play_dead();
110 #endif
111
112 schedule();
113 preempt_disable();
114 }
115 }
116
117 void machine_halt(void)
118 {
119 sstate_halt();
120 prom_halt();
121 panic("Halt failed!");
122 }
123
124 void machine_alt_power_off(void)
125 {
126 sstate_poweroff();
127 prom_halt_power_off();
128 panic("Power-off failed!");
129 }
130
131 void machine_restart(char * cmd)
132 {
133 char *p;
134
135 sstate_reboot();
136 p = strchr (reboot_command, '\n');
137 if (p) *p = 0;
138 if (cmd)
139 prom_reboot(cmd);
140 if (*reboot_command)
141 prom_reboot(reboot_command);
142 prom_reboot("");
143 panic("Reboot failed!");
144 }
145
146 #ifdef CONFIG_COMPAT
147 static void show_regwindow32(struct pt_regs *regs)
148 {
149 struct reg_window32 __user *rw;
150 struct reg_window32 r_w;
151 mm_segment_t old_fs;
152
153 __asm__ __volatile__ ("flushw");
154 rw = compat_ptr((unsigned)regs->u_regs[14]);
155 old_fs = get_fs();
156 set_fs (USER_DS);
157 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
158 set_fs (old_fs);
159 return;
160 }
161
162 set_fs (old_fs);
163 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
164 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
165 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
166 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
167 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
168 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
169 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
170 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
171 }
172 #else
173 #define show_regwindow32(regs) do { } while (0)
174 #endif
175
176 static void show_regwindow(struct pt_regs *regs)
177 {
178 struct reg_window __user *rw;
179 struct reg_window *rwk;
180 struct reg_window r_w;
181 mm_segment_t old_fs;
182
183 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
184 __asm__ __volatile__ ("flushw");
185 rw = (struct reg_window __user *)
186 (regs->u_regs[14] + STACK_BIAS);
187 rwk = (struct reg_window *)
188 (regs->u_regs[14] + STACK_BIAS);
189 if (!(regs->tstate & TSTATE_PRIV)) {
190 old_fs = get_fs();
191 set_fs (USER_DS);
192 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
193 set_fs (old_fs);
194 return;
195 }
196 rwk = &r_w;
197 set_fs (old_fs);
198 }
199 } else {
200 show_regwindow32(regs);
201 return;
202 }
203 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
204 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
205 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
206 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
207 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
208 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
209 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
210 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
211 if (regs->tstate & TSTATE_PRIV)
212 print_symbol("I7: <%s>\n", rwk->ins[7]);
213 }
214
215 #ifdef CONFIG_SMP
216 static DEFINE_SPINLOCK(regdump_lock);
217 #endif
218
219 void __show_regs(struct pt_regs * regs)
220 {
221 #ifdef CONFIG_SMP
222 unsigned long flags;
223
224 /* Protect against xcall ipis which might lead to livelock on the lock */
225 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
226 "wrpr %0, %1, %%pstate"
227 : "=r" (flags)
228 : "i" (PSTATE_IE));
229 spin_lock(&regdump_lock);
230 #endif
231 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
232 regs->tpc, regs->tnpc, regs->y, print_tainted());
233 print_symbol("TPC: <%s>\n", regs->tpc);
234 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
235 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
236 regs->u_regs[3]);
237 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
238 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
239 regs->u_regs[7]);
240 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
241 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
242 regs->u_regs[11]);
243 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
244 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
245 regs->u_regs[15]);
246 print_symbol("RPC: <%s>\n", regs->u_regs[15]);
247 show_regwindow(regs);
248 #ifdef CONFIG_SMP
249 spin_unlock(&regdump_lock);
250 __asm__ __volatile__("wrpr %0, 0, %%pstate"
251 : : "r" (flags));
252 #endif
253 }
254
255 #ifdef VERBOSE_SHOWREGS
256 static void idump_from_user (unsigned int *pc)
257 {
258 int i;
259 int code;
260
261 if((((unsigned long) pc) & 3))
262 return;
263
264 pc -= 3;
265 for(i = -3; i < 6; i++) {
266 get_user(code, pc);
267 printk("%c%08x%c",i?' ':'<',code,i?' ':'>');
268 pc++;
269 }
270 printk("\n");
271 }
272 #endif
273
274 void show_regs(struct pt_regs *regs)
275 {
276 #ifdef VERBOSE_SHOWREGS
277 extern long etrap, etraptl1;
278 #endif
279 __show_regs(regs);
280 #if 0
281 #ifdef CONFIG_SMP
282 {
283 extern void smp_report_regs(void);
284
285 smp_report_regs();
286 }
287 #endif
288 #endif
289
290 #ifdef VERBOSE_SHOWREGS
291 if (regs->tpc >= &etrap && regs->tpc < &etraptl1 &&
292 regs->u_regs[14] >= (long)current - PAGE_SIZE &&
293 regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) {
294 printk ("*********parent**********\n");
295 __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF));
296 idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc);
297 printk ("*********endpar**********\n");
298 }
299 #endif
300 }
301
302 unsigned long thread_saved_pc(struct task_struct *tsk)
303 {
304 struct thread_info *ti = task_thread_info(tsk);
305 unsigned long ret = 0xdeadbeefUL;
306
307 if (ti && ti->ksp) {
308 unsigned long *sp;
309 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
310 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
311 sp[14]) {
312 unsigned long *fp;
313 fp = (unsigned long *)(sp[14] + STACK_BIAS);
314 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
315 ret = fp[15];
316 }
317 }
318 return ret;
319 }
320
321 /* Free current thread data structures etc.. */
322 void exit_thread(void)
323 {
324 struct thread_info *t = current_thread_info();
325
326 if (t->utraps) {
327 if (t->utraps[0] < 2)
328 kfree (t->utraps);
329 else
330 t->utraps[0]--;
331 }
332
333 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
334 t->user_cntd0 = t->user_cntd1 = NULL;
335 t->pcr_reg = 0;
336 write_pcr(0);
337 }
338 }
339
340 void flush_thread(void)
341 {
342 struct thread_info *t = current_thread_info();
343 struct mm_struct *mm;
344
345 if (test_ti_thread_flag(t, TIF_ABI_PENDING)) {
346 clear_ti_thread_flag(t, TIF_ABI_PENDING);
347 if (test_ti_thread_flag(t, TIF_32BIT))
348 clear_ti_thread_flag(t, TIF_32BIT);
349 else
350 set_ti_thread_flag(t, TIF_32BIT);
351 }
352
353 mm = t->task->mm;
354 if (mm)
355 tsb_context_switch(mm);
356
357 set_thread_wsaved(0);
358
359 /* Turn off performance counters if on. */
360 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
361 t->user_cntd0 = t->user_cntd1 = NULL;
362 t->pcr_reg = 0;
363 write_pcr(0);
364 }
365
366 /* Clear FPU register state. */
367 t->fpsaved[0] = 0;
368
369 if (get_thread_current_ds() != ASI_AIUS)
370 set_fs(USER_DS);
371
372 /* Init new signal delivery disposition. */
373 clear_thread_flag(TIF_NEWSIGNALS);
374 }
375
376 /* It's a bit more tricky when 64-bit tasks are involved... */
377 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
378 {
379 unsigned long fp, distance, rval;
380
381 if (!(test_thread_flag(TIF_32BIT))) {
382 csp += STACK_BIAS;
383 psp += STACK_BIAS;
384 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
385 fp += STACK_BIAS;
386 } else
387 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
388
389 /* Now 8-byte align the stack as this is mandatory in the
390 * Sparc ABI due to how register windows work. This hides
391 * the restriction from thread libraries etc. -DaveM
392 */
393 csp &= ~7UL;
394
395 distance = fp - psp;
396 rval = (csp - distance);
397 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
398 rval = 0;
399 else if (test_thread_flag(TIF_32BIT)) {
400 if (put_user(((u32)csp),
401 &(((struct reg_window32 __user *)rval)->ins[6])))
402 rval = 0;
403 } else {
404 if (put_user(((u64)csp - STACK_BIAS),
405 &(((struct reg_window __user *)rval)->ins[6])))
406 rval = 0;
407 else
408 rval = rval - STACK_BIAS;
409 }
410
411 return rval;
412 }
413
414 /* Standard stuff. */
415 static inline void shift_window_buffer(int first_win, int last_win,
416 struct thread_info *t)
417 {
418 int i;
419
420 for (i = first_win; i < last_win; i++) {
421 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
422 memcpy(&t->reg_window[i], &t->reg_window[i+1],
423 sizeof(struct reg_window));
424 }
425 }
426
427 void synchronize_user_stack(void)
428 {
429 struct thread_info *t = current_thread_info();
430 unsigned long window;
431
432 flush_user_windows();
433 if ((window = get_thread_wsaved()) != 0) {
434 int winsize = sizeof(struct reg_window);
435 int bias = 0;
436
437 if (test_thread_flag(TIF_32BIT))
438 winsize = sizeof(struct reg_window32);
439 else
440 bias = STACK_BIAS;
441
442 window -= 1;
443 do {
444 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
445 struct reg_window *rwin = &t->reg_window[window];
446
447 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
448 shift_window_buffer(window, get_thread_wsaved() - 1, t);
449 set_thread_wsaved(get_thread_wsaved() - 1);
450 }
451 } while (window--);
452 }
453 }
454
455 static void stack_unaligned(unsigned long sp)
456 {
457 siginfo_t info;
458
459 info.si_signo = SIGBUS;
460 info.si_errno = 0;
461 info.si_code = BUS_ADRALN;
462 info.si_addr = (void __user *) sp;
463 info.si_trapno = 0;
464 force_sig_info(SIGBUS, &info, current);
465 }
466
467 void fault_in_user_windows(void)
468 {
469 struct thread_info *t = current_thread_info();
470 unsigned long window;
471 int winsize = sizeof(struct reg_window);
472 int bias = 0;
473
474 if (test_thread_flag(TIF_32BIT))
475 winsize = sizeof(struct reg_window32);
476 else
477 bias = STACK_BIAS;
478
479 flush_user_windows();
480 window = get_thread_wsaved();
481
482 if (likely(window != 0)) {
483 window -= 1;
484 do {
485 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
486 struct reg_window *rwin = &t->reg_window[window];
487
488 if (unlikely(sp & 0x7UL))
489 stack_unaligned(sp);
490
491 if (unlikely(copy_to_user((char __user *)sp,
492 rwin, winsize)))
493 goto barf;
494 } while (window--);
495 }
496 set_thread_wsaved(0);
497 return;
498
499 barf:
500 set_thread_wsaved(window + 1);
501 do_exit(SIGILL);
502 }
503
504 asmlinkage long sparc_do_fork(unsigned long clone_flags,
505 unsigned long stack_start,
506 struct pt_regs *regs,
507 unsigned long stack_size)
508 {
509 int __user *parent_tid_ptr, *child_tid_ptr;
510
511 #ifdef CONFIG_COMPAT
512 if (test_thread_flag(TIF_32BIT)) {
513 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
514 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
515 } else
516 #endif
517 {
518 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
519 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
520 }
521
522 return do_fork(clone_flags, stack_start,
523 regs, stack_size,
524 parent_tid_ptr, child_tid_ptr);
525 }
526
527 /* Copy a Sparc thread. The fork() return value conventions
528 * under SunOS are nothing short of bletcherous:
529 * Parent --> %o0 == childs pid, %o1 == 0
530 * Child --> %o0 == parents pid, %o1 == 1
531 */
532 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
533 unsigned long unused,
534 struct task_struct *p, struct pt_regs *regs)
535 {
536 struct thread_info *t = task_thread_info(p);
537 char *child_trap_frame;
538
539 /* Calculate offset to stack_frame & pt_regs */
540 child_trap_frame = task_stack_page(p) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ));
541 memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ));
542
543 t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
544 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
545 t->new_child = 1;
546 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
547 t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf));
548 t->fpsaved[0] = 0;
549
550 if (regs->tstate & TSTATE_PRIV) {
551 /* Special case, if we are spawning a kernel thread from
552 * a userspace task (via KMOD, NFS, or similar) we must
553 * disable performance counters in the child because the
554 * address space and protection realm are changing.
555 */
556 if (t->flags & _TIF_PERFCTR) {
557 t->user_cntd0 = t->user_cntd1 = NULL;
558 t->pcr_reg = 0;
559 t->flags &= ~_TIF_PERFCTR;
560 }
561 t->kregs->u_regs[UREG_FP] = t->ksp;
562 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
563 flush_register_windows();
564 memcpy((void *)(t->ksp + STACK_BIAS),
565 (void *)(regs->u_regs[UREG_FP] + STACK_BIAS),
566 sizeof(struct sparc_stackf));
567 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
568 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
569 } else {
570 if (t->flags & _TIF_32BIT) {
571 sp &= 0x00000000ffffffffUL;
572 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
573 }
574 t->kregs->u_regs[UREG_FP] = sp;
575 t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
576 if (sp != regs->u_regs[UREG_FP]) {
577 unsigned long csp;
578
579 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
580 if (!csp)
581 return -EFAULT;
582 t->kregs->u_regs[UREG_FP] = csp;
583 }
584 if (t->utraps)
585 t->utraps[0]++;
586 }
587
588 /* Set the return value for the child. */
589 t->kregs->u_regs[UREG_I0] = current->pid;
590 t->kregs->u_regs[UREG_I1] = 1;
591
592 /* Set the second return value for the parent. */
593 regs->u_regs[UREG_I1] = 0;
594
595 if (clone_flags & CLONE_SETTLS)
596 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
597
598 return 0;
599 }
600
601 /*
602 * This is the mechanism for creating a new kernel thread.
603 *
604 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
605 * who haven't done an "execve()") should use this: it will work within
606 * a system call from a "real" process, but the process memory space will
607 * not be freed until both the parent and the child have exited.
608 */
609 pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
610 {
611 long retval;
612
613 /* If the parent runs before fn(arg) is called by the child,
614 * the input registers of this function can be clobbered.
615 * So we stash 'fn' and 'arg' into global registers which
616 * will not be modified by the parent.
617 */
618 __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
619 "mov %5, %%g3\n\t" /* Save ARG into global */
620 "mov %1, %%g1\n\t" /* Clone syscall nr. */
621 "mov %2, %%o0\n\t" /* Clone flags. */
622 "mov 0, %%o1\n\t" /* usp arg == 0 */
623 "t 0x6d\n\t" /* Linux/Sparc clone(). */
624 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
625 " mov %%o0, %0\n\t"
626 "jmpl %%g2, %%o7\n\t" /* Call the function. */
627 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
628 "mov %3, %%g1\n\t"
629 "t 0x6d\n\t" /* Linux/Sparc exit(). */
630 /* Notreached by child. */
631 "1:" :
632 "=r" (retval) :
633 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
634 "i" (__NR_exit), "r" (fn), "r" (arg) :
635 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
636 return retval;
637 }
638
639 typedef struct {
640 union {
641 unsigned int pr_regs[32];
642 unsigned long pr_dregs[16];
643 } pr_fr;
644 unsigned int __unused;
645 unsigned int pr_fsr;
646 unsigned char pr_qcnt;
647 unsigned char pr_q_entrysize;
648 unsigned char pr_en;
649 unsigned int pr_q[64];
650 } elf_fpregset_t32;
651
652 /*
653 * fill in the fpu structure for a core dump.
654 */
655 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
656 {
657 unsigned long *kfpregs = current_thread_info()->fpregs;
658 unsigned long fprs = current_thread_info()->fpsaved[0];
659
660 if (test_thread_flag(TIF_32BIT)) {
661 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
662
663 if (fprs & FPRS_DL)
664 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
665 sizeof(unsigned int) * 32);
666 else
667 memset(&fpregs32->pr_fr.pr_regs[0], 0,
668 sizeof(unsigned int) * 32);
669 fpregs32->pr_qcnt = 0;
670 fpregs32->pr_q_entrysize = 8;
671 memset(&fpregs32->pr_q[0], 0,
672 (sizeof(unsigned int) * 64));
673 if (fprs & FPRS_FEF) {
674 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
675 fpregs32->pr_en = 1;
676 } else {
677 fpregs32->pr_fsr = 0;
678 fpregs32->pr_en = 0;
679 }
680 } else {
681 if(fprs & FPRS_DL)
682 memcpy(&fpregs->pr_regs[0], kfpregs,
683 sizeof(unsigned int) * 32);
684 else
685 memset(&fpregs->pr_regs[0], 0,
686 sizeof(unsigned int) * 32);
687 if(fprs & FPRS_DU)
688 memcpy(&fpregs->pr_regs[16], kfpregs+16,
689 sizeof(unsigned int) * 32);
690 else
691 memset(&fpregs->pr_regs[16], 0,
692 sizeof(unsigned int) * 32);
693 if(fprs & FPRS_FEF) {
694 fpregs->pr_fsr = current_thread_info()->xfsr[0];
695 fpregs->pr_gsr = current_thread_info()->gsr[0];
696 } else {
697 fpregs->pr_fsr = fpregs->pr_gsr = 0;
698 }
699 fpregs->pr_fprs = fprs;
700 }
701 return 1;
702 }
703
704 /*
705 * sparc_execve() executes a new program after the asm stub has set
706 * things up for us. This should basically do what I want it to.
707 */
708 asmlinkage int sparc_execve(struct pt_regs *regs)
709 {
710 int error, base = 0;
711 char *filename;
712
713 /* User register window flush is done by entry.S */
714
715 /* Check for indirect call. */
716 if (regs->u_regs[UREG_G1] == 0)
717 base = 1;
718
719 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
720 error = PTR_ERR(filename);
721 if (IS_ERR(filename))
722 goto out;
723 error = do_execve(filename,
724 (char __user * __user *)
725 regs->u_regs[base + UREG_I1],
726 (char __user * __user *)
727 regs->u_regs[base + UREG_I2], regs);
728 putname(filename);
729 if (!error) {
730 fprs_write(0);
731 current_thread_info()->xfsr[0] = 0;
732 current_thread_info()->fpsaved[0] = 0;
733 regs->tstate &= ~TSTATE_PEF;
734 task_lock(current);
735 current->ptrace &= ~PT_DTRACE;
736 task_unlock(current);
737 }
738 out:
739 return error;
740 }
741
742 unsigned long get_wchan(struct task_struct *task)
743 {
744 unsigned long pc, fp, bias = 0;
745 unsigned long thread_info_base;
746 struct reg_window *rw;
747 unsigned long ret = 0;
748 int count = 0;
749
750 if (!task || task == current ||
751 task->state == TASK_RUNNING)
752 goto out;
753
754 thread_info_base = (unsigned long) task_stack_page(task);
755 bias = STACK_BIAS;
756 fp = task_thread_info(task)->ksp + bias;
757
758 do {
759 /* Bogus frame pointer? */
760 if (fp < (thread_info_base + sizeof(struct thread_info)) ||
761 fp >= (thread_info_base + THREAD_SIZE))
762 break;
763 rw = (struct reg_window *) fp;
764 pc = rw->ins[7];
765 if (!in_sched_functions(pc)) {
766 ret = pc;
767 goto out;
768 }
769 fp = rw->ins[6] + bias;
770 } while (++count < 16);
771
772 out:
773 return ret;
774 }
WRT350N Kernel Patches