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[PATCH] ocfs2: zero_user_page conversion
[wrt350n-kernel.git] / arch / sparc64 / kernel / process.c
blobf5f97e2c669c53d71a9429c9eeaa5f624e767a8a
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/smp.h>
22 #include <linux/stddef.h>
23 #include <linux/ptrace.h>
24 #include <linux/slab.h>
25 #include <linux/user.h>
26 #include <linux/a.out.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
33 #include <asm/oplib.h>
34 #include <asm/uaccess.h>
35 #include <asm/system.h>
36 #include <asm/page.h>
37 #include <asm/pgalloc.h>
38 #include <asm/pgtable.h>
39 #include <asm/processor.h>
40 #include <asm/pstate.h>
41 #include <asm/elf.h>
42 #include <asm/fpumacro.h>
43 #include <asm/head.h>
44 #include <asm/cpudata.h>
45 #include <asm/mmu_context.h>
46 #include <asm/unistd.h>
47 #include <asm/hypervisor.h>
48 #include <asm/sstate.h>
49
50 /* #define VERBOSE_SHOWREGS */
51
52 static void sparc64_yield(void)
53 {
54 if (tlb_type != hypervisor)
55 return;
56
57 clear_thread_flag(TIF_POLLING_NRFLAG);
58 smp_mb__after_clear_bit();
59
60 while (!need_resched()) {
61 unsigned long pstate;
62
63 /* Disable interrupts. */
64 __asm__ __volatile__(
65 "rdpr %%pstate, %0\n\t"
66 "andn %0, %1, %0\n\t"
67 "wrpr %0, %%g0, %%pstate"
68 : "=&r" (pstate)
69 : "i" (PSTATE_IE));
70
71 if (!need_resched())
72 sun4v_cpu_yield();
73
74 /* Re-enable interrupts. */
75 __asm__ __volatile__(
76 "rdpr %%pstate, %0\n\t"
77 "or %0, %1, %0\n\t"
78 "wrpr %0, %%g0, %%pstate"
79 : "=&r" (pstate)
80 : "i" (PSTATE_IE));
81 }
82
83 set_thread_flag(TIF_POLLING_NRFLAG);
84 }
85
86 /* The idle loop on sparc64. */
87 void cpu_idle(void)
88 {
89 set_thread_flag(TIF_POLLING_NRFLAG);
90
91 while(1) {
92 tick_nohz_stop_sched_tick();
93 while (!need_resched())
94 sparc64_yield();
95 tick_nohz_restart_sched_tick();
96
97 preempt_enable_no_resched();
98 schedule();
99 preempt_disable();
100 }
101 }
102
103 extern char reboot_command [];
104
105 extern void (*prom_palette)(int);
106 extern void (*prom_keyboard)(void);
107
108 void machine_halt(void)
109 {
110 sstate_halt();
111 if (!serial_console && prom_palette)
112 prom_palette (1);
113 if (prom_keyboard)
114 prom_keyboard();
115 prom_halt();
116 panic("Halt failed!");
117 }
118
119 void machine_alt_power_off(void)
120 {
121 sstate_poweroff();
122 if (!serial_console && prom_palette)
123 prom_palette(1);
124 if (prom_keyboard)
125 prom_keyboard();
126 prom_halt_power_off();
127 panic("Power-off failed!");
128 }
129
130 void machine_restart(char * cmd)
131 {
132 char *p;
133
134 sstate_reboot();
135 p = strchr (reboot_command, '\n');
136 if (p) *p = 0;
137 if (!serial_console && prom_palette)
138 prom_palette (1);
139 if (prom_keyboard)
140 prom_keyboard();
141 if (cmd)
142 prom_reboot(cmd);
143 if (*reboot_command)
144 prom_reboot(reboot_command);
145 prom_reboot("");
146 panic("Reboot failed!");
147 }
148
149 #ifdef CONFIG_COMPAT
150 static void show_regwindow32(struct pt_regs *regs)
151 {
152 struct reg_window32 __user *rw;
153 struct reg_window32 r_w;
154 mm_segment_t old_fs;
155
156 __asm__ __volatile__ ("flushw");
157 rw = compat_ptr((unsigned)regs->u_regs[14]);
158 old_fs = get_fs();
159 set_fs (USER_DS);
160 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
161 set_fs (old_fs);
162 return;
163 }
164
165 set_fs (old_fs);
166 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
167 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
168 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
169 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
170 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
171 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
172 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
173 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
174 }
175 #else
176 #define show_regwindow32(regs) do { } while (0)
177 #endif
178
179 static void show_regwindow(struct pt_regs *regs)
180 {
181 struct reg_window __user *rw;
182 struct reg_window *rwk;
183 struct reg_window r_w;
184 mm_segment_t old_fs;
185
186 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
187 __asm__ __volatile__ ("flushw");
188 rw = (struct reg_window __user *)
189 (regs->u_regs[14] + STACK_BIAS);
190 rwk = (struct reg_window *)
191 (regs->u_regs[14] + STACK_BIAS);
192 if (!(regs->tstate & TSTATE_PRIV)) {
193 old_fs = get_fs();
194 set_fs (USER_DS);
195 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
196 set_fs (old_fs);
197 return;
198 }
199 rwk = &r_w;
200 set_fs (old_fs);
201 }
202 } else {
203 show_regwindow32(regs);
204 return;
205 }
206 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
207 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
208 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
209 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
210 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
211 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
212 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
213 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
214 if (regs->tstate & TSTATE_PRIV)
215 print_symbol("I7: <%s>\n", rwk->ins[7]);
216 }
217
218 void show_stackframe(struct sparc_stackf *sf)
219 {
220 unsigned long size;
221 unsigned long *stk;
222 int i;
223
224 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n"
225 "l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
226 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3],
227 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
228 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n"
229 "i4: %016lx i5: %016lx fp: %016lx ret_pc: %016lx\n",
230 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3],
231 sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc);
232 printk("sp: %016lx x0: %016lx x1: %016lx x2: %016lx\n"
233 "x3: %016lx x4: %016lx x5: %016lx xx: %016lx\n",
234 (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1],
235 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
236 sf->xxargs[0]);
237 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
238 size -= STACKFRAME_SZ;
239 stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ);
240 i = 0;
241 do {
242 printk("s%d: %016lx\n", i++, *stk++);
243 } while ((size -= sizeof(unsigned long)));
244 }
245
246 void show_stackframe32(struct sparc_stackf32 *sf)
247 {
248 unsigned long size;
249 unsigned *stk;
250 int i;
251
252 printk("l0: %08x l1: %08x l2: %08x l3: %08x\n",
253 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3]);
254 printk("l4: %08x l5: %08x l6: %08x l7: %08x\n",
255 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
256 printk("i0: %08x i1: %08x i2: %08x i3: %08x\n",
257 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3]);
258 printk("i4: %08x i5: %08x fp: %08x ret_pc: %08x\n",
259 sf->ins[4], sf->ins[5], sf->fp, sf->callers_pc);
260 printk("sp: %08x x0: %08x x1: %08x x2: %08x\n"
261 "x3: %08x x4: %08x x5: %08x xx: %08x\n",
262 sf->structptr, sf->xargs[0], sf->xargs[1],
263 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
264 sf->xxargs[0]);
265 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
266 size -= STACKFRAME32_SZ;
267 stk = (unsigned *)((unsigned long)sf + STACKFRAME32_SZ);
268 i = 0;
269 do {
270 printk("s%d: %08x\n", i++, *stk++);
271 } while ((size -= sizeof(unsigned)));
272 }
273
274 #ifdef CONFIG_SMP
275 static DEFINE_SPINLOCK(regdump_lock);
276 #endif
277
278 void __show_regs(struct pt_regs * regs)
279 {
280 #ifdef CONFIG_SMP
281 unsigned long flags;
282
283 /* Protect against xcall ipis which might lead to livelock on the lock */
284 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
285 "wrpr %0, %1, %%pstate"
286 : "=r" (flags)
287 : "i" (PSTATE_IE));
288 spin_lock(&regdump_lock);
289 #endif
290 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
291 regs->tpc, regs->tnpc, regs->y, print_tainted());
292 print_symbol("TPC: <%s>\n", regs->tpc);
293 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
294 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
295 regs->u_regs[3]);
296 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
297 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
298 regs->u_regs[7]);
299 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
300 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
301 regs->u_regs[11]);
302 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
303 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
304 regs->u_regs[15]);
305 print_symbol("RPC: <%s>\n", regs->u_regs[15]);
306 show_regwindow(regs);
307 #ifdef CONFIG_SMP
308 spin_unlock(&regdump_lock);
309 __asm__ __volatile__("wrpr %0, 0, %%pstate"
310 : : "r" (flags));
311 #endif
312 }
313
314 #ifdef VERBOSE_SHOWREGS
315 static void idump_from_user (unsigned int *pc)
316 {
317 int i;
318 int code;
319
320 if((((unsigned long) pc) & 3))
321 return;
322
323 pc -= 3;
324 for(i = -3; i < 6; i++) {
325 get_user(code, pc);
326 printk("%c%08x%c",i?' ':'<',code,i?' ':'>');
327 pc++;
328 }
329 printk("\n");
330 }
331 #endif
332
333 void show_regs(struct pt_regs *regs)
334 {
335 #ifdef VERBOSE_SHOWREGS
336 extern long etrap, etraptl1;
337 #endif
338 __show_regs(regs);
339 #if 0
340 #ifdef CONFIG_SMP
341 {
342 extern void smp_report_regs(void);
343
344 smp_report_regs();
345 }
346 #endif
347 #endif
348
349 #ifdef VERBOSE_SHOWREGS
350 if (regs->tpc >= &etrap && regs->tpc < &etraptl1 &&
351 regs->u_regs[14] >= (long)current - PAGE_SIZE &&
352 regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) {
353 printk ("*********parent**********\n");
354 __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF));
355 idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc);
356 printk ("*********endpar**********\n");
357 }
358 #endif
359 }
360
361 void show_regs32(struct pt_regs32 *regs)
362 {
363 printk("PSR: %08x PC: %08x NPC: %08x Y: %08x %s\n", regs->psr,
364 regs->pc, regs->npc, regs->y, print_tainted());
365 printk("g0: %08x g1: %08x g2: %08x g3: %08x ",
366 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
367 regs->u_regs[3]);
368 printk("g4: %08x g5: %08x g6: %08x g7: %08x\n",
369 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
370 regs->u_regs[7]);
371 printk("o0: %08x o1: %08x o2: %08x o3: %08x ",
372 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
373 regs->u_regs[11]);
374 printk("o4: %08x o5: %08x sp: %08x ret_pc: %08x\n",
375 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
376 regs->u_regs[15]);
377 }
378
379 unsigned long thread_saved_pc(struct task_struct *tsk)
380 {
381 struct thread_info *ti = task_thread_info(tsk);
382 unsigned long ret = 0xdeadbeefUL;
383
384 if (ti && ti->ksp) {
385 unsigned long *sp;
386 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
387 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
388 sp[14]) {
389 unsigned long *fp;
390 fp = (unsigned long *)(sp[14] + STACK_BIAS);
391 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
392 ret = fp[15];
393 }
394 }
395 return ret;
396 }
397
398 /* Free current thread data structures etc.. */
399 void exit_thread(void)
400 {
401 struct thread_info *t = current_thread_info();
402
403 if (t->utraps) {
404 if (t->utraps[0] < 2)
405 kfree (t->utraps);
406 else
407 t->utraps[0]--;
408 }
409
410 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
411 t->user_cntd0 = t->user_cntd1 = NULL;
412 t->pcr_reg = 0;
413 write_pcr(0);
414 }
415 }
416
417 void flush_thread(void)
418 {
419 struct thread_info *t = current_thread_info();
420 struct mm_struct *mm;
421
422 if (test_ti_thread_flag(t, TIF_ABI_PENDING)) {
423 clear_ti_thread_flag(t, TIF_ABI_PENDING);
424 if (test_ti_thread_flag(t, TIF_32BIT))
425 clear_ti_thread_flag(t, TIF_32BIT);
426 else
427 set_ti_thread_flag(t, TIF_32BIT);
428 }
429
430 mm = t->task->mm;
431 if (mm)
432 tsb_context_switch(mm);
433
434 set_thread_wsaved(0);
435
436 /* Turn off performance counters if on. */
437 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
438 t->user_cntd0 = t->user_cntd1 = NULL;
439 t->pcr_reg = 0;
440 write_pcr(0);
441 }
442
443 /* Clear FPU register state. */
444 t->fpsaved[0] = 0;
445
446 if (get_thread_current_ds() != ASI_AIUS)
447 set_fs(USER_DS);
448
449 /* Init new signal delivery disposition. */
450 clear_thread_flag(TIF_NEWSIGNALS);
451 }
452
453 /* It's a bit more tricky when 64-bit tasks are involved... */
454 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
455 {
456 unsigned long fp, distance, rval;
457
458 if (!(test_thread_flag(TIF_32BIT))) {
459 csp += STACK_BIAS;
460 psp += STACK_BIAS;
461 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
462 fp += STACK_BIAS;
463 } else
464 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
465
466 /* Now 8-byte align the stack as this is mandatory in the
467 * Sparc ABI due to how register windows work. This hides
468 * the restriction from thread libraries etc. -DaveM
469 */
470 csp &= ~7UL;
471
472 distance = fp - psp;
473 rval = (csp - distance);
474 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
475 rval = 0;
476 else if (test_thread_flag(TIF_32BIT)) {
477 if (put_user(((u32)csp),
478 &(((struct reg_window32 __user *)rval)->ins[6])))
479 rval = 0;
480 } else {
481 if (put_user(((u64)csp - STACK_BIAS),
482 &(((struct reg_window __user *)rval)->ins[6])))
483 rval = 0;
484 else
485 rval = rval - STACK_BIAS;
486 }
487
488 return rval;
489 }
490
491 /* Standard stuff. */
492 static inline void shift_window_buffer(int first_win, int last_win,
493 struct thread_info *t)
494 {
495 int i;
496
497 for (i = first_win; i < last_win; i++) {
498 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
499 memcpy(&t->reg_window[i], &t->reg_window[i+1],
500 sizeof(struct reg_window));
501 }
502 }
503
504 void synchronize_user_stack(void)
505 {
506 struct thread_info *t = current_thread_info();
507 unsigned long window;
508
509 flush_user_windows();
510 if ((window = get_thread_wsaved()) != 0) {
511 int winsize = sizeof(struct reg_window);
512 int bias = 0;
513
514 if (test_thread_flag(TIF_32BIT))
515 winsize = sizeof(struct reg_window32);
516 else
517 bias = STACK_BIAS;
518
519 window -= 1;
520 do {
521 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
522 struct reg_window *rwin = &t->reg_window[window];
523
524 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
525 shift_window_buffer(window, get_thread_wsaved() - 1, t);
526 set_thread_wsaved(get_thread_wsaved() - 1);
527 }
528 } while (window--);
529 }
530 }
531
532 static void stack_unaligned(unsigned long sp)
533 {
534 siginfo_t info;
535
536 info.si_signo = SIGBUS;
537 info.si_errno = 0;
538 info.si_code = BUS_ADRALN;
539 info.si_addr = (void __user *) sp;
540 info.si_trapno = 0;
541 force_sig_info(SIGBUS, &info, current);
542 }
543
544 void fault_in_user_windows(void)
545 {
546 struct thread_info *t = current_thread_info();
547 unsigned long window;
548 int winsize = sizeof(struct reg_window);
549 int bias = 0;
550
551 if (test_thread_flag(TIF_32BIT))
552 winsize = sizeof(struct reg_window32);
553 else
554 bias = STACK_BIAS;
555
556 flush_user_windows();
557 window = get_thread_wsaved();
558
559 if (likely(window != 0)) {
560 window -= 1;
561 do {
562 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
563 struct reg_window *rwin = &t->reg_window[window];
564
565 if (unlikely(sp & 0x7UL))
566 stack_unaligned(sp);
567
568 if (unlikely(copy_to_user((char __user *)sp,
569 rwin, winsize)))
570 goto barf;
571 } while (window--);
572 }
573 set_thread_wsaved(0);
574 return;
575
576 barf:
577 set_thread_wsaved(window + 1);
578 do_exit(SIGILL);
579 }
580
581 asmlinkage long sparc_do_fork(unsigned long clone_flags,
582 unsigned long stack_start,
583 struct pt_regs *regs,
584 unsigned long stack_size)
585 {
586 int __user *parent_tid_ptr, *child_tid_ptr;
587
588 #ifdef CONFIG_COMPAT
589 if (test_thread_flag(TIF_32BIT)) {
590 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
591 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
592 } else
593 #endif
594 {
595 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
596 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
597 }
598
599 return do_fork(clone_flags, stack_start,
600 regs, stack_size,
601 parent_tid_ptr, child_tid_ptr);
602 }
603
604 /* Copy a Sparc thread. The fork() return value conventions
605 * under SunOS are nothing short of bletcherous:
606 * Parent --> %o0 == childs pid, %o1 == 0
607 * Child --> %o0 == parents pid, %o1 == 1
608 */
609 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
610 unsigned long unused,
611 struct task_struct *p, struct pt_regs *regs)
612 {
613 struct thread_info *t = task_thread_info(p);
614 char *child_trap_frame;
615
616 /* Calculate offset to stack_frame & pt_regs */
617 child_trap_frame = task_stack_page(p) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ));
618 memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ));
619
620 t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
621 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
622 t->new_child = 1;
623 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
624 t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf));
625 t->fpsaved[0] = 0;
626
627 if (regs->tstate & TSTATE_PRIV) {
628 /* Special case, if we are spawning a kernel thread from
629 * a userspace task (via KMOD, NFS, or similar) we must
630 * disable performance counters in the child because the
631 * address space and protection realm are changing.
632 */
633 if (t->flags & _TIF_PERFCTR) {
634 t->user_cntd0 = t->user_cntd1 = NULL;
635 t->pcr_reg = 0;
636 t->flags &= ~_TIF_PERFCTR;
637 }
638 t->kregs->u_regs[UREG_FP] = t->ksp;
639 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
640 flush_register_windows();
641 memcpy((void *)(t->ksp + STACK_BIAS),
642 (void *)(regs->u_regs[UREG_FP] + STACK_BIAS),
643 sizeof(struct sparc_stackf));
644 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
645 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
646 } else {
647 if (t->flags & _TIF_32BIT) {
648 sp &= 0x00000000ffffffffUL;
649 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
650 }
651 t->kregs->u_regs[UREG_FP] = sp;
652 t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
653 if (sp != regs->u_regs[UREG_FP]) {
654 unsigned long csp;
655
656 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
657 if (!csp)
658 return -EFAULT;
659 t->kregs->u_regs[UREG_FP] = csp;
660 }
661 if (t->utraps)
662 t->utraps[0]++;
663 }
664
665 /* Set the return value for the child. */
666 t->kregs->u_regs[UREG_I0] = current->pid;
667 t->kregs->u_regs[UREG_I1] = 1;
668
669 /* Set the second return value for the parent. */
670 regs->u_regs[UREG_I1] = 0;
671
672 if (clone_flags & CLONE_SETTLS)
673 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
674
675 return 0;
676 }
677
678 /*
679 * This is the mechanism for creating a new kernel thread.
680 *
681 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
682 * who haven't done an "execve()") should use this: it will work within
683 * a system call from a "real" process, but the process memory space will
684 * not be freed until both the parent and the child have exited.
685 */
686 pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
687 {
688 long retval;
689
690 /* If the parent runs before fn(arg) is called by the child,
691 * the input registers of this function can be clobbered.
692 * So we stash 'fn' and 'arg' into global registers which
693 * will not be modified by the parent.
694 */
695 __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
696 "mov %5, %%g3\n\t" /* Save ARG into global */
697 "mov %1, %%g1\n\t" /* Clone syscall nr. */
698 "mov %2, %%o0\n\t" /* Clone flags. */
699 "mov 0, %%o1\n\t" /* usp arg == 0 */
700 "t 0x6d\n\t" /* Linux/Sparc clone(). */
701 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
702 " mov %%o0, %0\n\t"
703 "jmpl %%g2, %%o7\n\t" /* Call the function. */
704 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
705 "mov %3, %%g1\n\t"
706 "t 0x6d\n\t" /* Linux/Sparc exit(). */
707 /* Notreached by child. */
708 "1:" :
709 "=r" (retval) :
710 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
711 "i" (__NR_exit), "r" (fn), "r" (arg) :
712 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
713 return retval;
714 }
715
716 /*
717 * fill in the user structure for a core dump..
718 */
719 void dump_thread(struct pt_regs * regs, struct user * dump)
720 {
721 /* Only should be used for SunOS and ancient a.out
722 * SparcLinux binaries... Not worth implementing.
723 */
724 memset(dump, 0, sizeof(struct user));
725 }
726
727 typedef struct {
728 union {
729 unsigned int pr_regs[32];
730 unsigned long pr_dregs[16];
731 } pr_fr;
732 unsigned int __unused;
733 unsigned int pr_fsr;
734 unsigned char pr_qcnt;
735 unsigned char pr_q_entrysize;
736 unsigned char pr_en;
737 unsigned int pr_q[64];
738 } elf_fpregset_t32;
739
740 /*
741 * fill in the fpu structure for a core dump.
742 */
743 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
744 {
745 unsigned long *kfpregs = current_thread_info()->fpregs;
746 unsigned long fprs = current_thread_info()->fpsaved[0];
747
748 if (test_thread_flag(TIF_32BIT)) {
749 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
750
751 if (fprs & FPRS_DL)
752 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
753 sizeof(unsigned int) * 32);
754 else
755 memset(&fpregs32->pr_fr.pr_regs[0], 0,
756 sizeof(unsigned int) * 32);
757 fpregs32->pr_qcnt = 0;
758 fpregs32->pr_q_entrysize = 8;
759 memset(&fpregs32->pr_q[0], 0,
760 (sizeof(unsigned int) * 64));
761 if (fprs & FPRS_FEF) {
762 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
763 fpregs32->pr_en = 1;
764 } else {
765 fpregs32->pr_fsr = 0;
766 fpregs32->pr_en = 0;
767 }
768 } else {
769 if(fprs & FPRS_DL)
770 memcpy(&fpregs->pr_regs[0], kfpregs,
771 sizeof(unsigned int) * 32);
772 else
773 memset(&fpregs->pr_regs[0], 0,
774 sizeof(unsigned int) * 32);
775 if(fprs & FPRS_DU)
776 memcpy(&fpregs->pr_regs[16], kfpregs+16,
777 sizeof(unsigned int) * 32);
778 else
779 memset(&fpregs->pr_regs[16], 0,
780 sizeof(unsigned int) * 32);
781 if(fprs & FPRS_FEF) {
782 fpregs->pr_fsr = current_thread_info()->xfsr[0];
783 fpregs->pr_gsr = current_thread_info()->gsr[0];
784 } else {
785 fpregs->pr_fsr = fpregs->pr_gsr = 0;
786 }
787 fpregs->pr_fprs = fprs;
788 }
789 return 1;
790 }
791
792 /*
793 * sparc_execve() executes a new program after the asm stub has set
794 * things up for us. This should basically do what I want it to.
795 */
796 asmlinkage int sparc_execve(struct pt_regs *regs)
797 {
798 int error, base = 0;
799 char *filename;
800
801 /* User register window flush is done by entry.S */
802
803 /* Check for indirect call. */
804 if (regs->u_regs[UREG_G1] == 0)
805 base = 1;
806
807 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
808 error = PTR_ERR(filename);
809 if (IS_ERR(filename))
810 goto out;
811 error = do_execve(filename,
812 (char __user * __user *)
813 regs->u_regs[base + UREG_I1],
814 (char __user * __user *)
815 regs->u_regs[base + UREG_I2], regs);
816 putname(filename);
817 if (!error) {
818 fprs_write(0);
819 current_thread_info()->xfsr[0] = 0;
820 current_thread_info()->fpsaved[0] = 0;
821 regs->tstate &= ~TSTATE_PEF;
822 task_lock(current);
823 current->ptrace &= ~PT_DTRACE;
824 task_unlock(current);
825 }
826 out:
827 return error;
828 }
829
830 unsigned long get_wchan(struct task_struct *task)
831 {
832 unsigned long pc, fp, bias = 0;
833 unsigned long thread_info_base;
834 struct reg_window *rw;
835 unsigned long ret = 0;
836 int count = 0;
837
838 if (!task || task == current ||
839 task->state == TASK_RUNNING)
840 goto out;
841
842 thread_info_base = (unsigned long) task_stack_page(task);
843 bias = STACK_BIAS;
844 fp = task_thread_info(task)->ksp + bias;
845
846 do {
847 /* Bogus frame pointer? */
848 if (fp < (thread_info_base + sizeof(struct thread_info)) ||
849 fp >= (thread_info_base + THREAD_SIZE))
850 break;
851 rw = (struct reg_window *) fp;
852 pc = rw->ins[7];
853 if (!in_sched_functions(pc)) {
854 ret = pc;
855 goto out;
856 }
857 fp = rw->ins[6] + bias;
858 } while (++count < 16);
859
860 out:
861 return ret;
862 }
WRT350N Kernel Patches