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[PATCH] w1: Userspace communication protocol over connector.
[linux-2.6/verdex.git] / arch / sparc64 / kernel / process.c
blob1c7ca2f712d99004106ba087aa021cd202cae2f7
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>
47 #include <asm/mmu_context.h>
48 #include <asm/unistd.h>
49 #include <asm/hypervisor.h>
50
51 /* #define VERBOSE_SHOWREGS */
52
53 static void sparc64_yield(void)
54 {
55 if (tlb_type != hypervisor)
56 return;
57
58 clear_thread_flag(TIF_POLLING_NRFLAG);
59 smp_mb__after_clear_bit();
60
61 while (!need_resched()) {
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
72 if (!need_resched())
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));
82 }
83
84 set_thread_flag(TIF_POLLING_NRFLAG);
85 }
86
87 /* The idle loop on sparc64. */
88 void cpu_idle(void)
89 {
90 set_thread_flag(TIF_POLLING_NRFLAG);
91
92 while(1) {
93 if (need_resched()) {
94 preempt_enable_no_resched();
95 schedule();
96 preempt_disable();
97 }
98 sparc64_yield();
99 }
100 }
101
102 extern char reboot_command [];
103
104 extern void (*prom_palette)(int);
105 extern void (*prom_keyboard)(void);
106
107 void machine_halt(void)
108 {
109 if (!serial_console && prom_palette)
110 prom_palette (1);
111 if (prom_keyboard)
112 prom_keyboard();
113 prom_halt();
114 panic("Halt failed!");
115 }
116
117 void machine_alt_power_off(void)
118 {
119 if (!serial_console && prom_palette)
120 prom_palette(1);
121 if (prom_keyboard)
122 prom_keyboard();
123 prom_halt_power_off();
124 panic("Power-off failed!");
125 }
126
127 void machine_restart(char * cmd)
128 {
129 char *p;
130
131 p = strchr (reboot_command, '\n');
132 if (p) *p = 0;
133 if (!serial_console && prom_palette)
134 prom_palette (1);
135 if (prom_keyboard)
136 prom_keyboard();
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
145 #ifdef CONFIG_COMPAT
146 static 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 }
171 #else
172 #define show_regwindow32(regs) do { } while (0)
173 #endif
174
175 static 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
214 void 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
242 void 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
271 static DEFINE_SPINLOCK(regdump_lock);
272 #endif
273
274 void __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
311 static 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
329 void show_regs(struct pt_regs *regs)
330 {
331 #ifdef VERBOSE_SHOWREGS
332 extern long etrap, etraptl1;
333 #endif
334 __show_regs(regs);
335 #if 0
336 #ifdef CONFIG_SMP
337 {
338 extern void smp_report_regs(void);
339
340 smp_report_regs();
341 }
342 #endif
343 #endif
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
357 void 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
375 unsigned long thread_saved_pc(struct task_struct *tsk)
376 {
377 struct thread_info *ti = task_thread_info(tsk);
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.. */
395 void 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
413 void flush_thread(void)
414 {
415 struct thread_info *t = current_thread_info();
416 struct mm_struct *mm;
417
418 if (t->flags & _TIF_ABI_PENDING)
419 t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT);
420
421 mm = t->task->mm;
422 if (mm)
423 tsb_context_switch(mm);
424
425 set_thread_wsaved(0);
426
427 /* Turn off performance counters if on. */
428 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
429 t->user_cntd0 = t->user_cntd1 = NULL;
430 t->pcr_reg = 0;
431 write_pcr(0);
432 }
433
434 /* Clear FPU register state. */
435 t->fpsaved[0] = 0;
436
437 if (get_thread_current_ds() != ASI_AIUS)
438 set_fs(USER_DS);
439
440 /* Init new signal delivery disposition. */
441 clear_thread_flag(TIF_NEWSIGNALS);
442 }
443
444 /* It's a bit more tricky when 64-bit tasks are involved... */
445 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
446 {
447 unsigned long fp, distance, rval;
448
449 if (!(test_thread_flag(TIF_32BIT))) {
450 csp += STACK_BIAS;
451 psp += STACK_BIAS;
452 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
453 fp += STACK_BIAS;
454 } else
455 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
456
457 /* Now 8-byte align the stack as this is mandatory in the
458 * Sparc ABI due to how register windows work. This hides
459 * the restriction from thread libraries etc. -DaveM
460 */
461 csp &= ~7UL;
462
463 distance = fp - psp;
464 rval = (csp - distance);
465 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
466 rval = 0;
467 else if (test_thread_flag(TIF_32BIT)) {
468 if (put_user(((u32)csp),
469 &(((struct reg_window32 __user *)rval)->ins[6])))
470 rval = 0;
471 } else {
472 if (put_user(((u64)csp - STACK_BIAS),
473 &(((struct reg_window __user *)rval)->ins[6])))
474 rval = 0;
475 else
476 rval = rval - STACK_BIAS;
477 }
478
479 return rval;
480 }
481
482 /* Standard stuff. */
483 static inline void shift_window_buffer(int first_win, int last_win,
484 struct thread_info *t)
485 {
486 int i;
487
488 for (i = first_win; i < last_win; i++) {
489 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
490 memcpy(&t->reg_window[i], &t->reg_window[i+1],
491 sizeof(struct reg_window));
492 }
493 }
494
495 void synchronize_user_stack(void)
496 {
497 struct thread_info *t = current_thread_info();
498 unsigned long window;
499
500 flush_user_windows();
501 if ((window = get_thread_wsaved()) != 0) {
502 int winsize = sizeof(struct reg_window);
503 int bias = 0;
504
505 if (test_thread_flag(TIF_32BIT))
506 winsize = sizeof(struct reg_window32);
507 else
508 bias = STACK_BIAS;
509
510 window -= 1;
511 do {
512 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
513 struct reg_window *rwin = &t->reg_window[window];
514
515 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
516 shift_window_buffer(window, get_thread_wsaved() - 1, t);
517 set_thread_wsaved(get_thread_wsaved() - 1);
518 }
519 } while (window--);
520 }
521 }
522
523 static void stack_unaligned(unsigned long sp)
524 {
525 siginfo_t info;
526
527 info.si_signo = SIGBUS;
528 info.si_errno = 0;
529 info.si_code = BUS_ADRALN;
530 info.si_addr = (void __user *) sp;
531 info.si_trapno = 0;
532 force_sig_info(SIGBUS, &info, current);
533 }
534
535 void fault_in_user_windows(void)
536 {
537 struct thread_info *t = current_thread_info();
538 unsigned long window;
539 int winsize = sizeof(struct reg_window);
540 int bias = 0;
541
542 if (test_thread_flag(TIF_32BIT))
543 winsize = sizeof(struct reg_window32);
544 else
545 bias = STACK_BIAS;
546
547 flush_user_windows();
548 window = get_thread_wsaved();
549
550 if (likely(window != 0)) {
551 window -= 1;
552 do {
553 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
554 struct reg_window *rwin = &t->reg_window[window];
555
556 if (unlikely(sp & 0x7UL))
557 stack_unaligned(sp);
558
559 if (unlikely(copy_to_user((char __user *)sp,
560 rwin, winsize)))
561 goto barf;
562 } while (window--);
563 }
564 set_thread_wsaved(0);
565 return;
566
567 barf:
568 set_thread_wsaved(window + 1);
569 do_exit(SIGILL);
570 }
571
572 asmlinkage long sparc_do_fork(unsigned long clone_flags,
573 unsigned long stack_start,
574 struct pt_regs *regs,
575 unsigned long stack_size)
576 {
577 int __user *parent_tid_ptr, *child_tid_ptr;
578
579 #ifdef CONFIG_COMPAT
580 if (test_thread_flag(TIF_32BIT)) {
581 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
582 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
583 } else
584 #endif
585 {
586 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
587 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
588 }
589
590 return do_fork(clone_flags, stack_start,
591 regs, stack_size,
592 parent_tid_ptr, child_tid_ptr);
593 }
594
595 /* Copy a Sparc thread. The fork() return value conventions
596 * under SunOS are nothing short of bletcherous:
597 * Parent --> %o0 == childs pid, %o1 == 0
598 * Child --> %o0 == parents pid, %o1 == 1
599 */
600 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
601 unsigned long unused,
602 struct task_struct *p, struct pt_regs *regs)
603 {
604 struct thread_info *t = task_thread_info(p);
605 char *child_trap_frame;
606
607 /* Calculate offset to stack_frame & pt_regs */
608 child_trap_frame = task_stack_page(p) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ));
609 memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ));
610
611 t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
612 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
613 t->new_child = 1;
614 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
615 t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf));
616 t->fpsaved[0] = 0;
617
618 if (regs->tstate & TSTATE_PRIV) {
619 /* Special case, if we are spawning a kernel thread from
620 * a userspace task (via KMOD, NFS, or similar) we must
621 * disable performance counters in the child because the
622 * address space and protection realm are changing.
623 */
624 if (t->flags & _TIF_PERFCTR) {
625 t->user_cntd0 = t->user_cntd1 = NULL;
626 t->pcr_reg = 0;
627 t->flags &= ~_TIF_PERFCTR;
628 }
629 t->kregs->u_regs[UREG_FP] = t->ksp;
630 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
631 flush_register_windows();
632 memcpy((void *)(t->ksp + STACK_BIAS),
633 (void *)(regs->u_regs[UREG_FP] + STACK_BIAS),
634 sizeof(struct sparc_stackf));
635 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
636 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
637 } else {
638 if (t->flags & _TIF_32BIT) {
639 sp &= 0x00000000ffffffffUL;
640 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
641 }
642 t->kregs->u_regs[UREG_FP] = sp;
643 t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
644 if (sp != regs->u_regs[UREG_FP]) {
645 unsigned long csp;
646
647 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
648 if (!csp)
649 return -EFAULT;
650 t->kregs->u_regs[UREG_FP] = csp;
651 }
652 if (t->utraps)
653 t->utraps[0]++;
654 }
655
656 /* Set the return value for the child. */
657 t->kregs->u_regs[UREG_I0] = current->pid;
658 t->kregs->u_regs[UREG_I1] = 1;
659
660 /* Set the second return value for the parent. */
661 regs->u_regs[UREG_I1] = 0;
662
663 if (clone_flags & CLONE_SETTLS)
664 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
665
666 return 0;
667 }
668
669 /*
670 * This is the mechanism for creating a new kernel thread.
671 *
672 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
673 * who haven't done an "execve()") should use this: it will work within
674 * a system call from a "real" process, but the process memory space will
675 * not be free'd until both the parent and the child have exited.
676 */
677 pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
678 {
679 long retval;
680
681 /* If the parent runs before fn(arg) is called by the child,
682 * the input registers of this function can be clobbered.
683 * So we stash 'fn' and 'arg' into global registers which
684 * will not be modified by the parent.
685 */
686 __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
687 "mov %5, %%g3\n\t" /* Save ARG into global */
688 "mov %1, %%g1\n\t" /* Clone syscall nr. */
689 "mov %2, %%o0\n\t" /* Clone flags. */
690 "mov 0, %%o1\n\t" /* usp arg == 0 */
691 "t 0x6d\n\t" /* Linux/Sparc clone(). */
692 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
693 " mov %%o0, %0\n\t"
694 "jmpl %%g2, %%o7\n\t" /* Call the function. */
695 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
696 "mov %3, %%g1\n\t"
697 "t 0x6d\n\t" /* Linux/Sparc exit(). */
698 /* Notreached by child. */
699 "1:" :
700 "=r" (retval) :
701 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
702 "i" (__NR_exit), "r" (fn), "r" (arg) :
703 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
704 return retval;
705 }
706
707 /*
708 * fill in the user structure for a core dump..
709 */
710 void dump_thread(struct pt_regs * regs, struct user * dump)
711 {
712 /* Only should be used for SunOS and ancient a.out
713 * SparcLinux binaries... Not worth implementing.
714 */
715 memset(dump, 0, sizeof(struct user));
716 }
717
718 typedef struct {
719 union {
720 unsigned int pr_regs[32];
721 unsigned long pr_dregs[16];
722 } pr_fr;
723 unsigned int __unused;
724 unsigned int pr_fsr;
725 unsigned char pr_qcnt;
726 unsigned char pr_q_entrysize;
727 unsigned char pr_en;
728 unsigned int pr_q[64];
729 } elf_fpregset_t32;
730
731 /*
732 * fill in the fpu structure for a core dump.
733 */
734 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
735 {
736 unsigned long *kfpregs = current_thread_info()->fpregs;
737 unsigned long fprs = current_thread_info()->fpsaved[0];
738
739 if (test_thread_flag(TIF_32BIT)) {
740 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
741
742 if (fprs & FPRS_DL)
743 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
744 sizeof(unsigned int) * 32);
745 else
746 memset(&fpregs32->pr_fr.pr_regs[0], 0,
747 sizeof(unsigned int) * 32);
748 fpregs32->pr_qcnt = 0;
749 fpregs32->pr_q_entrysize = 8;
750 memset(&fpregs32->pr_q[0], 0,
751 (sizeof(unsigned int) * 64));
752 if (fprs & FPRS_FEF) {
753 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
754 fpregs32->pr_en = 1;
755 } else {
756 fpregs32->pr_fsr = 0;
757 fpregs32->pr_en = 0;
758 }
759 } else {
760 if(fprs & FPRS_DL)
761 memcpy(&fpregs->pr_regs[0], kfpregs,
762 sizeof(unsigned int) * 32);
763 else
764 memset(&fpregs->pr_regs[0], 0,
765 sizeof(unsigned int) * 32);
766 if(fprs & FPRS_DU)
767 memcpy(&fpregs->pr_regs[16], kfpregs+16,
768 sizeof(unsigned int) * 32);
769 else
770 memset(&fpregs->pr_regs[16], 0,
771 sizeof(unsigned int) * 32);
772 if(fprs & FPRS_FEF) {
773 fpregs->pr_fsr = current_thread_info()->xfsr[0];
774 fpregs->pr_gsr = current_thread_info()->gsr[0];
775 } else {
776 fpregs->pr_fsr = fpregs->pr_gsr = 0;
777 }
778 fpregs->pr_fprs = fprs;
779 }
780 return 1;
781 }
782
783 /*
784 * sparc_execve() executes a new program after the asm stub has set
785 * things up for us. This should basically do what I want it to.
786 */
787 asmlinkage int sparc_execve(struct pt_regs *regs)
788 {
789 int error, base = 0;
790 char *filename;
791
792 /* User register window flush is done by entry.S */
793
794 /* Check for indirect call. */
795 if (regs->u_regs[UREG_G1] == 0)
796 base = 1;
797
798 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
799 error = PTR_ERR(filename);
800 if (IS_ERR(filename))
801 goto out;
802 error = do_execve(filename,
803 (char __user * __user *)
804 regs->u_regs[base + UREG_I1],
805 (char __user * __user *)
806 regs->u_regs[base + UREG_I2], regs);
807 putname(filename);
808 if (!error) {
809 fprs_write(0);
810 current_thread_info()->xfsr[0] = 0;
811 current_thread_info()->fpsaved[0] = 0;
812 regs->tstate &= ~TSTATE_PEF;
813 task_lock(current);
814 current->ptrace &= ~PT_DTRACE;
815 task_unlock(current);
816 }
817 out:
818 return error;
819 }
820
821 unsigned long get_wchan(struct task_struct *task)
822 {
823 unsigned long pc, fp, bias = 0;
824 unsigned long thread_info_base;
825 struct reg_window *rw;
826 unsigned long ret = 0;
827 int count = 0;
828
829 if (!task || task == current ||
830 task->state == TASK_RUNNING)
831 goto out;
832
833 thread_info_base = (unsigned long) task_stack_page(task);
834 bias = STACK_BIAS;
835 fp = task_thread_info(task)->ksp + bias;
836
837 do {
838 /* Bogus frame pointer? */
839 if (fp < (thread_info_base + sizeof(struct thread_info)) ||
840 fp >= (thread_info_base + THREAD_SIZE))
841 break;
842 rw = (struct reg_window *) fp;
843 pc = rw->ins[7];
844 if (!in_sched_functions(pc)) {
845 ret = pc;
846 goto out;
847 }
848 fp = rw->ins[6] + bias;
849 } while (++count < 16);
850
851 out:
852 return ret;
853 }
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