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Linux 2.6.21
[linux/fpc-iii.git] / arch / sparc64 / kernel / process.c
blobb291060c25a642daf5d369a9a77cb594abf0903f
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/smp_lock.h>
23 #include <linux/stddef.h>
24 #include <linux/ptrace.h>
25 #include <linux/slab.h>
26 #include <linux/user.h>
27 #include <linux/a.out.h>
28 #include <linux/reboot.h>
29 #include <linux/delay.h>
30 #include <linux/compat.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
49 /* #define VERBOSE_SHOWREGS */
50
51 static void sparc64_yield(void)
52 {
53 if (tlb_type != hypervisor)
54 return;
55
56 clear_thread_flag(TIF_POLLING_NRFLAG);
57 smp_mb__after_clear_bit();
58
59 while (!need_resched()) {
60 unsigned long pstate;
61
62 /* Disable interrupts. */
63 __asm__ __volatile__(
64 "rdpr %%pstate, %0\n\t"
65 "andn %0, %1, %0\n\t"
66 "wrpr %0, %%g0, %%pstate"
67 : "=&r" (pstate)
68 : "i" (PSTATE_IE));
69
70 if (!need_resched())
71 sun4v_cpu_yield();
72
73 /* Re-enable interrupts. */
74 __asm__ __volatile__(
75 "rdpr %%pstate, %0\n\t"
76 "or %0, %1, %0\n\t"
77 "wrpr %0, %%g0, %%pstate"
78 : "=&r" (pstate)
79 : "i" (PSTATE_IE));
80 }
81
82 set_thread_flag(TIF_POLLING_NRFLAG);
83 }
84
85 /* The idle loop on sparc64. */
86 void cpu_idle(void)
87 {
88 set_thread_flag(TIF_POLLING_NRFLAG);
89
90 while(1) {
91 if (need_resched()) {
92 preempt_enable_no_resched();
93 schedule();
94 preempt_disable();
95 }
96 sparc64_yield();
97 }
98 }
99
100 extern char reboot_command [];
101
102 extern void (*prom_palette)(int);
103 extern void (*prom_keyboard)(void);
104
105 void machine_halt(void)
106 {
107 if (!serial_console && prom_palette)
108 prom_palette (1);
109 if (prom_keyboard)
110 prom_keyboard();
111 prom_halt();
112 panic("Halt failed!");
113 }
114
115 void machine_alt_power_off(void)
116 {
117 if (!serial_console && prom_palette)
118 prom_palette(1);
119 if (prom_keyboard)
120 prom_keyboard();
121 prom_halt_power_off();
122 panic("Power-off failed!");
123 }
124
125 void machine_restart(char * cmd)
126 {
127 char *p;
128
129 p = strchr (reboot_command, '\n');
130 if (p) *p = 0;
131 if (!serial_console && prom_palette)
132 prom_palette (1);
133 if (prom_keyboard)
134 prom_keyboard();
135 if (cmd)
136 prom_reboot(cmd);
137 if (*reboot_command)
138 prom_reboot(reboot_command);
139 prom_reboot("");
140 panic("Reboot failed!");
141 }
142
143 #ifdef CONFIG_COMPAT
144 static void show_regwindow32(struct pt_regs *regs)
145 {
146 struct reg_window32 __user *rw;
147 struct reg_window32 r_w;
148 mm_segment_t old_fs;
149
150 __asm__ __volatile__ ("flushw");
151 rw = compat_ptr((unsigned)regs->u_regs[14]);
152 old_fs = get_fs();
153 set_fs (USER_DS);
154 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
155 set_fs (old_fs);
156 return;
157 }
158
159 set_fs (old_fs);
160 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
161 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
162 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
163 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
164 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
165 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
166 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
167 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
168 }
169 #else
170 #define show_regwindow32(regs) do { } while (0)
171 #endif
172
173 static void show_regwindow(struct pt_regs *regs)
174 {
175 struct reg_window __user *rw;
176 struct reg_window *rwk;
177 struct reg_window r_w;
178 mm_segment_t old_fs;
179
180 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
181 __asm__ __volatile__ ("flushw");
182 rw = (struct reg_window __user *)
183 (regs->u_regs[14] + STACK_BIAS);
184 rwk = (struct reg_window *)
185 (regs->u_regs[14] + STACK_BIAS);
186 if (!(regs->tstate & TSTATE_PRIV)) {
187 old_fs = get_fs();
188 set_fs (USER_DS);
189 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
190 set_fs (old_fs);
191 return;
192 }
193 rwk = &r_w;
194 set_fs (old_fs);
195 }
196 } else {
197 show_regwindow32(regs);
198 return;
199 }
200 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
201 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
202 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
203 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
204 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
205 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
206 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
207 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
208 if (regs->tstate & TSTATE_PRIV)
209 print_symbol("I7: <%s>\n", rwk->ins[7]);
210 }
211
212 void show_stackframe(struct sparc_stackf *sf)
213 {
214 unsigned long size;
215 unsigned long *stk;
216 int i;
217
218 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n"
219 "l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
220 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3],
221 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
222 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n"
223 "i4: %016lx i5: %016lx fp: %016lx ret_pc: %016lx\n",
224 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3],
225 sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc);
226 printk("sp: %016lx x0: %016lx x1: %016lx x2: %016lx\n"
227 "x3: %016lx x4: %016lx x5: %016lx xx: %016lx\n",
228 (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1],
229 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
230 sf->xxargs[0]);
231 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
232 size -= STACKFRAME_SZ;
233 stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ);
234 i = 0;
235 do {
236 printk("s%d: %016lx\n", i++, *stk++);
237 } while ((size -= sizeof(unsigned long)));
238 }
239
240 void show_stackframe32(struct sparc_stackf32 *sf)
241 {
242 unsigned long size;
243 unsigned *stk;
244 int i;
245
246 printk("l0: %08x l1: %08x l2: %08x l3: %08x\n",
247 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3]);
248 printk("l4: %08x l5: %08x l6: %08x l7: %08x\n",
249 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
250 printk("i0: %08x i1: %08x i2: %08x i3: %08x\n",
251 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3]);
252 printk("i4: %08x i5: %08x fp: %08x ret_pc: %08x\n",
253 sf->ins[4], sf->ins[5], sf->fp, sf->callers_pc);
254 printk("sp: %08x x0: %08x x1: %08x x2: %08x\n"
255 "x3: %08x x4: %08x x5: %08x xx: %08x\n",
256 sf->structptr, sf->xargs[0], sf->xargs[1],
257 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
258 sf->xxargs[0]);
259 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
260 size -= STACKFRAME32_SZ;
261 stk = (unsigned *)((unsigned long)sf + STACKFRAME32_SZ);
262 i = 0;
263 do {
264 printk("s%d: %08x\n", i++, *stk++);
265 } while ((size -= sizeof(unsigned)));
266 }
267
268 #ifdef CONFIG_SMP
269 static DEFINE_SPINLOCK(regdump_lock);
270 #endif
271
272 void __show_regs(struct pt_regs * regs)
273 {
274 #ifdef CONFIG_SMP
275 unsigned long flags;
276
277 /* Protect against xcall ipis which might lead to livelock on the lock */
278 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
279 "wrpr %0, %1, %%pstate"
280 : "=r" (flags)
281 : "i" (PSTATE_IE));
282 spin_lock(&regdump_lock);
283 #endif
284 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
285 regs->tpc, regs->tnpc, regs->y, print_tainted());
286 print_symbol("TPC: <%s>\n", regs->tpc);
287 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
288 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
289 regs->u_regs[3]);
290 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
291 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
292 regs->u_regs[7]);
293 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
294 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
295 regs->u_regs[11]);
296 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
297 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
298 regs->u_regs[15]);
299 print_symbol("RPC: <%s>\n", regs->u_regs[15]);
300 show_regwindow(regs);
301 #ifdef CONFIG_SMP
302 spin_unlock(&regdump_lock);
303 __asm__ __volatile__("wrpr %0, 0, %%pstate"
304 : : "r" (flags));
305 #endif
306 }
307
308 #ifdef VERBOSE_SHOWREGS
309 static void idump_from_user (unsigned int *pc)
310 {
311 int i;
312 int code;
313
314 if((((unsigned long) pc) & 3))
315 return;
316
317 pc -= 3;
318 for(i = -3; i < 6; i++) {
319 get_user(code, pc);
320 printk("%c%08x%c",i?' ':'<',code,i?' ':'>');
321 pc++;
322 }
323 printk("\n");
324 }
325 #endif
326
327 void show_regs(struct pt_regs *regs)
328 {
329 #ifdef VERBOSE_SHOWREGS
330 extern long etrap, etraptl1;
331 #endif
332 __show_regs(regs);
333 #if 0
334 #ifdef CONFIG_SMP
335 {
336 extern void smp_report_regs(void);
337
338 smp_report_regs();
339 }
340 #endif
341 #endif
342
343 #ifdef VERBOSE_SHOWREGS
344 if (regs->tpc >= &etrap && regs->tpc < &etraptl1 &&
345 regs->u_regs[14] >= (long)current - PAGE_SIZE &&
346 regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) {
347 printk ("*********parent**********\n");
348 __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF));
349 idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc);
350 printk ("*********endpar**********\n");
351 }
352 #endif
353 }
354
355 void show_regs32(struct pt_regs32 *regs)
356 {
357 printk("PSR: %08x PC: %08x NPC: %08x Y: %08x %s\n", regs->psr,
358 regs->pc, regs->npc, regs->y, print_tainted());
359 printk("g0: %08x g1: %08x g2: %08x g3: %08x ",
360 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
361 regs->u_regs[3]);
362 printk("g4: %08x g5: %08x g6: %08x g7: %08x\n",
363 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
364 regs->u_regs[7]);
365 printk("o0: %08x o1: %08x o2: %08x o3: %08x ",
366 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
367 regs->u_regs[11]);
368 printk("o4: %08x o5: %08x sp: %08x ret_pc: %08x\n",
369 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
370 regs->u_regs[15]);
371 }
372
373 unsigned long thread_saved_pc(struct task_struct *tsk)
374 {
375 struct thread_info *ti = task_thread_info(tsk);
376 unsigned long ret = 0xdeadbeefUL;
377
378 if (ti && ti->ksp) {
379 unsigned long *sp;
380 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
381 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
382 sp[14]) {
383 unsigned long *fp;
384 fp = (unsigned long *)(sp[14] + STACK_BIAS);
385 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
386 ret = fp[15];
387 }
388 }
389 return ret;
390 }
391
392 /* Free current thread data structures etc.. */
393 void exit_thread(void)
394 {
395 struct thread_info *t = current_thread_info();
396
397 if (t->utraps) {
398 if (t->utraps[0] < 2)
399 kfree (t->utraps);
400 else
401 t->utraps[0]--;
402 }
403
404 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
405 t->user_cntd0 = t->user_cntd1 = NULL;
406 t->pcr_reg = 0;
407 write_pcr(0);
408 }
409 }
410
411 void flush_thread(void)
412 {
413 struct thread_info *t = current_thread_info();
414 struct mm_struct *mm;
415
416 if (test_ti_thread_flag(t, TIF_ABI_PENDING)) {
417 clear_ti_thread_flag(t, TIF_ABI_PENDING);
418 if (test_ti_thread_flag(t, TIF_32BIT))
419 clear_ti_thread_flag(t, TIF_32BIT);
420 else
421 set_ti_thread_flag(t, TIF_32BIT);
422 }
423
424 mm = t->task->mm;
425 if (mm)
426 tsb_context_switch(mm);
427
428 set_thread_wsaved(0);
429
430 /* Turn off performance counters if on. */
431 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
432 t->user_cntd0 = t->user_cntd1 = NULL;
433 t->pcr_reg = 0;
434 write_pcr(0);
435 }
436
437 /* Clear FPU register state. */
438 t->fpsaved[0] = 0;
439
440 if (get_thread_current_ds() != ASI_AIUS)
441 set_fs(USER_DS);
442
443 /* Init new signal delivery disposition. */
444 clear_thread_flag(TIF_NEWSIGNALS);
445 }
446
447 /* It's a bit more tricky when 64-bit tasks are involved... */
448 static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
449 {
450 unsigned long fp, distance, rval;
451
452 if (!(test_thread_flag(TIF_32BIT))) {
453 csp += STACK_BIAS;
454 psp += STACK_BIAS;
455 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
456 fp += STACK_BIAS;
457 } else
458 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
459
460 /* Now 8-byte align the stack as this is mandatory in the
461 * Sparc ABI due to how register windows work. This hides
462 * the restriction from thread libraries etc. -DaveM
463 */
464 csp &= ~7UL;
465
466 distance = fp - psp;
467 rval = (csp - distance);
468 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
469 rval = 0;
470 else if (test_thread_flag(TIF_32BIT)) {
471 if (put_user(((u32)csp),
472 &(((struct reg_window32 __user *)rval)->ins[6])))
473 rval = 0;
474 } else {
475 if (put_user(((u64)csp - STACK_BIAS),
476 &(((struct reg_window __user *)rval)->ins[6])))
477 rval = 0;
478 else
479 rval = rval - STACK_BIAS;
480 }
481
482 return rval;
483 }
484
485 /* Standard stuff. */
486 static inline void shift_window_buffer(int first_win, int last_win,
487 struct thread_info *t)
488 {
489 int i;
490
491 for (i = first_win; i < last_win; i++) {
492 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
493 memcpy(&t->reg_window[i], &t->reg_window[i+1],
494 sizeof(struct reg_window));
495 }
496 }
497
498 void synchronize_user_stack(void)
499 {
500 struct thread_info *t = current_thread_info();
501 unsigned long window;
502
503 flush_user_windows();
504 if ((window = get_thread_wsaved()) != 0) {
505 int winsize = sizeof(struct reg_window);
506 int bias = 0;
507
508 if (test_thread_flag(TIF_32BIT))
509 winsize = sizeof(struct reg_window32);
510 else
511 bias = STACK_BIAS;
512
513 window -= 1;
514 do {
515 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
516 struct reg_window *rwin = &t->reg_window[window];
517
518 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
519 shift_window_buffer(window, get_thread_wsaved() - 1, t);
520 set_thread_wsaved(get_thread_wsaved() - 1);
521 }
522 } while (window--);
523 }
524 }
525
526 static void stack_unaligned(unsigned long sp)
527 {
528 siginfo_t info;
529
530 info.si_signo = SIGBUS;
531 info.si_errno = 0;
532 info.si_code = BUS_ADRALN;
533 info.si_addr = (void __user *) sp;
534 info.si_trapno = 0;
535 force_sig_info(SIGBUS, &info, current);
536 }
537
538 void fault_in_user_windows(void)
539 {
540 struct thread_info *t = current_thread_info();
541 unsigned long window;
542 int winsize = sizeof(struct reg_window);
543 int bias = 0;
544
545 if (test_thread_flag(TIF_32BIT))
546 winsize = sizeof(struct reg_window32);
547 else
548 bias = STACK_BIAS;
549
550 flush_user_windows();
551 window = get_thread_wsaved();
552
553 if (likely(window != 0)) {
554 window -= 1;
555 do {
556 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
557 struct reg_window *rwin = &t->reg_window[window];
558
559 if (unlikely(sp & 0x7UL))
560 stack_unaligned(sp);
561
562 if (unlikely(copy_to_user((char __user *)sp,
563 rwin, winsize)))
564 goto barf;
565 } while (window--);
566 }
567 set_thread_wsaved(0);
568 return;
569
570 barf:
571 set_thread_wsaved(window + 1);
572 do_exit(SIGILL);
573 }
574
575 asmlinkage long sparc_do_fork(unsigned long clone_flags,
576 unsigned long stack_start,
577 struct pt_regs *regs,
578 unsigned long stack_size)
579 {
580 int __user *parent_tid_ptr, *child_tid_ptr;
581
582 #ifdef CONFIG_COMPAT
583 if (test_thread_flag(TIF_32BIT)) {
584 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
585 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
586 } else
587 #endif
588 {
589 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
590 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
591 }
592
593 return do_fork(clone_flags, stack_start,
594 regs, stack_size,
595 parent_tid_ptr, child_tid_ptr);
596 }
597
598 /* Copy a Sparc thread. The fork() return value conventions
599 * under SunOS are nothing short of bletcherous:
600 * Parent --> %o0 == childs pid, %o1 == 0
601 * Child --> %o0 == parents pid, %o1 == 1
602 */
603 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
604 unsigned long unused,
605 struct task_struct *p, struct pt_regs *regs)
606 {
607 struct thread_info *t = task_thread_info(p);
608 char *child_trap_frame;
609
610 /* Calculate offset to stack_frame & pt_regs */
611 child_trap_frame = task_stack_page(p) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ));
612 memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ));
613
614 t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
615 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
616 t->new_child = 1;
617 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
618 t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf));
619 t->fpsaved[0] = 0;
620
621 if (regs->tstate & TSTATE_PRIV) {
622 /* Special case, if we are spawning a kernel thread from
623 * a userspace task (via KMOD, NFS, or similar) we must
624 * disable performance counters in the child because the
625 * address space and protection realm are changing.
626 */
627 if (t->flags & _TIF_PERFCTR) {
628 t->user_cntd0 = t->user_cntd1 = NULL;
629 t->pcr_reg = 0;
630 t->flags &= ~_TIF_PERFCTR;
631 }
632 t->kregs->u_regs[UREG_FP] = t->ksp;
633 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
634 flush_register_windows();
635 memcpy((void *)(t->ksp + STACK_BIAS),
636 (void *)(regs->u_regs[UREG_FP] + STACK_BIAS),
637 sizeof(struct sparc_stackf));
638 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
639 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
640 } else {
641 if (t->flags & _TIF_32BIT) {
642 sp &= 0x00000000ffffffffUL;
643 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
644 }
645 t->kregs->u_regs[UREG_FP] = sp;
646 t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
647 if (sp != regs->u_regs[UREG_FP]) {
648 unsigned long csp;
649
650 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
651 if (!csp)
652 return -EFAULT;
653 t->kregs->u_regs[UREG_FP] = csp;
654 }
655 if (t->utraps)
656 t->utraps[0]++;
657 }
658
659 /* Set the return value for the child. */
660 t->kregs->u_regs[UREG_I0] = current->pid;
661 t->kregs->u_regs[UREG_I1] = 1;
662
663 /* Set the second return value for the parent. */
664 regs->u_regs[UREG_I1] = 0;
665
666 if (clone_flags & CLONE_SETTLS)
667 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
668
669 return 0;
670 }
671
672 /*
673 * This is the mechanism for creating a new kernel thread.
674 *
675 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
676 * who haven't done an "execve()") should use this: it will work within
677 * a system call from a "real" process, but the process memory space will
678 * not be free'd until both the parent and the child have exited.
679 */
680 pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
681 {
682 long retval;
683
684 /* If the parent runs before fn(arg) is called by the child,
685 * the input registers of this function can be clobbered.
686 * So we stash 'fn' and 'arg' into global registers which
687 * will not be modified by the parent.
688 */
689 __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
690 "mov %5, %%g3\n\t" /* Save ARG into global */
691 "mov %1, %%g1\n\t" /* Clone syscall nr. */
692 "mov %2, %%o0\n\t" /* Clone flags. */
693 "mov 0, %%o1\n\t" /* usp arg == 0 */
694 "t 0x6d\n\t" /* Linux/Sparc clone(). */
695 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
696 " mov %%o0, %0\n\t"
697 "jmpl %%g2, %%o7\n\t" /* Call the function. */
698 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
699 "mov %3, %%g1\n\t"
700 "t 0x6d\n\t" /* Linux/Sparc exit(). */
701 /* Notreached by child. */
702 "1:" :
703 "=r" (retval) :
704 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
705 "i" (__NR_exit), "r" (fn), "r" (arg) :
706 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
707 return retval;
708 }
709
710 /*
711 * fill in the user structure for a core dump..
712 */
713 void dump_thread(struct pt_regs * regs, struct user * dump)
714 {
715 /* Only should be used for SunOS and ancient a.out
716 * SparcLinux binaries... Not worth implementing.
717 */
718 memset(dump, 0, sizeof(struct user));
719 }
720
721 typedef struct {
722 union {
723 unsigned int pr_regs[32];
724 unsigned long pr_dregs[16];
725 } pr_fr;
726 unsigned int __unused;
727 unsigned int pr_fsr;
728 unsigned char pr_qcnt;
729 unsigned char pr_q_entrysize;
730 unsigned char pr_en;
731 unsigned int pr_q[64];
732 } elf_fpregset_t32;
733
734 /*
735 * fill in the fpu structure for a core dump.
736 */
737 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
738 {
739 unsigned long *kfpregs = current_thread_info()->fpregs;
740 unsigned long fprs = current_thread_info()->fpsaved[0];
741
742 if (test_thread_flag(TIF_32BIT)) {
743 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
744
745 if (fprs & FPRS_DL)
746 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
747 sizeof(unsigned int) * 32);
748 else
749 memset(&fpregs32->pr_fr.pr_regs[0], 0,
750 sizeof(unsigned int) * 32);
751 fpregs32->pr_qcnt = 0;
752 fpregs32->pr_q_entrysize = 8;
753 memset(&fpregs32->pr_q[0], 0,
754 (sizeof(unsigned int) * 64));
755 if (fprs & FPRS_FEF) {
756 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
757 fpregs32->pr_en = 1;
758 } else {
759 fpregs32->pr_fsr = 0;
760 fpregs32->pr_en = 0;
761 }
762 } else {
763 if(fprs & FPRS_DL)
764 memcpy(&fpregs->pr_regs[0], kfpregs,
765 sizeof(unsigned int) * 32);
766 else
767 memset(&fpregs->pr_regs[0], 0,
768 sizeof(unsigned int) * 32);
769 if(fprs & FPRS_DU)
770 memcpy(&fpregs->pr_regs[16], kfpregs+16,
771 sizeof(unsigned int) * 32);
772 else
773 memset(&fpregs->pr_regs[16], 0,
774 sizeof(unsigned int) * 32);
775 if(fprs & FPRS_FEF) {
776 fpregs->pr_fsr = current_thread_info()->xfsr[0];
777 fpregs->pr_gsr = current_thread_info()->gsr[0];
778 } else {
779 fpregs->pr_fsr = fpregs->pr_gsr = 0;
780 }
781 fpregs->pr_fprs = fprs;
782 }
783 return 1;
784 }
785
786 /*
787 * sparc_execve() executes a new program after the asm stub has set
788 * things up for us. This should basically do what I want it to.
789 */
790 asmlinkage int sparc_execve(struct pt_regs *regs)
791 {
792 int error, base = 0;
793 char *filename;
794
795 /* User register window flush is done by entry.S */
796
797 /* Check for indirect call. */
798 if (regs->u_regs[UREG_G1] == 0)
799 base = 1;
800
801 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
802 error = PTR_ERR(filename);
803 if (IS_ERR(filename))
804 goto out;
805 error = do_execve(filename,
806 (char __user * __user *)
807 regs->u_regs[base + UREG_I1],
808 (char __user * __user *)
809 regs->u_regs[base + UREG_I2], regs);
810 putname(filename);
811 if (!error) {
812 fprs_write(0);
813 current_thread_info()->xfsr[0] = 0;
814 current_thread_info()->fpsaved[0] = 0;
815 regs->tstate &= ~TSTATE_PEF;
816 task_lock(current);
817 current->ptrace &= ~PT_DTRACE;
818 task_unlock(current);
819 }
820 out:
821 return error;
822 }
823
824 unsigned long get_wchan(struct task_struct *task)
825 {
826 unsigned long pc, fp, bias = 0;
827 unsigned long thread_info_base;
828 struct reg_window *rw;
829 unsigned long ret = 0;
830 int count = 0;
831
832 if (!task || task == current ||
833 task->state == TASK_RUNNING)
834 goto out;
835
836 thread_info_base = (unsigned long) task_stack_page(task);
837 bias = STACK_BIAS;
838 fp = task_thread_info(task)->ksp + bias;
839
840 do {
841 /* Bogus frame pointer? */
842 if (fp < (thread_info_base + sizeof(struct thread_info)) ||
843 fp >= (thread_info_base + THREAD_SIZE))
844 break;
845 rw = (struct reg_window *) fp;
846 pc = rw->ins[7];
847 if (!in_sched_functions(pc)) {
848 ret = pc;
849 goto out;
850 }
851 fp = rw->ins[6] + bias;
852 } while (++count < 16);
853
854 out:
855 return ret;
856 }
Linux with added FPC-III support