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sparc: remove CVS keywords
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / sparc64 / kernel / process.c
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5526b7e4 1/* arch/sparc64/kernel/process.c
1da177e4
LT		 2 *
3 * Copyright (C) 1995, 1996 David S. Miller (davem@caip.rutgers.edu)
4 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
5 * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6 */
7
8/*
9 * This file handles the architecture-dependent parts of process handling..
10 */
11
12#include <stdarg.h>
13
1da177e4
LT		 14#include <linux/errno.h>
15#include <linux/module.h>
16#include <linux/sched.h>
17#include <linux/kernel.h>
18#include <linux/kallsyms.h>
19#include <linux/mm.h>
4e950f6f 20#include <linux/fs.h>
1da177e4 21#include <linux/smp.h>
1da177e4
LT		 22#include <linux/stddef.h>
23#include <linux/ptrace.h>
24#include <linux/slab.h>
25#include <linux/user.h>
1da177e4
LT		 26#include <linux/reboot.h>
27#include <linux/delay.h>
28#include <linux/compat.h>
038cb01e 29#include <linux/tick.h>
1da177e4 30#include <linux/init.h>
e0204409 31#include <linux/cpu.h>
b1422401 32#include <linux/elfcore.h>
1da177e4
LT		 33
34#include <asm/oplib.h>
35#include <asm/uaccess.h>
36#include <asm/system.h>
37#include <asm/page.h>
38#include <asm/pgalloc.h>
39#include <asm/pgtable.h>
40#include <asm/processor.h>
41#include <asm/pstate.h>
42#include <asm/elf.h>
43#include <asm/fpumacro.h>
44#include <asm/head.h>
45#include <asm/cpudata.h>
74bf4312 46#include <asm/mmu_context.h>
1da177e4 47#include <asm/unistd.h>
30c91d57 48#include <asm/hypervisor.h>
22d6a1cb 49#include <asm/sstate.h>
c3c25240 50#include <asm/reboot.h>
b1422401 51#include <asm/syscalls.h>
1da177e4
LT		 52
53/* #define VERBOSE_SHOWREGS */
54
e0204409 55static void sparc64_yield(int cpu)
1da177e4 56{
30c91d57
DM		 57 if (tlb_type != hypervisor)
58 return;
59
60 clear_thread_flag(TIF_POLLING_NRFLAG);
61 smp_mb__after_clear_bit();
62
e0204409 63 while (!need_resched() && !cpu_is_offline(cpu)) {
30c91d57
DM		 64 unsigned long pstate;
65
66 /* Disable interrupts. */
67 __asm__ __volatile__(
68 "rdpr %%pstate, %0\n\t"
69 "andn %0, %1, %0\n\t"
70 "wrpr %0, %%g0, %%pstate"
71 : "=&r" (pstate)
72 : "i" (PSTATE_IE));
73
e0204409 74 if (!need_resched() && !cpu_is_offline(cpu))
30c91d57
DM		 75 sun4v_cpu_yield();
76
77 /* Re-enable interrupts. */
78 __asm__ __volatile__(
79 "rdpr %%pstate, %0\n\t"
80 "or %0, %1, %0\n\t"
81 "wrpr %0, %%g0, %%pstate"
82 : "=&r" (pstate)
83 : "i" (PSTATE_IE));
1da177e4 84 }
1da177e4 85
30c91d57
DM		 86 set_thread_flag(TIF_POLLING_NRFLAG);
87}
1da177e4 88
30c91d57 89/* The idle loop on sparc64. */
1da177e4
LT		 90void cpu_idle(void)
91{
e0204409
DM		 92 int cpu = smp_processor_id();
93
1da177e4 94 set_thread_flag(TIF_POLLING_NRFLAG);
64c7c8f8 95
1da177e4 96 while(1) {
038cb01e 97 tick_nohz_stop_sched_tick();
e0204409
DM		 98
99 while (!need_resched() && !cpu_is_offline(cpu))
100 sparc64_yield(cpu);
101
038cb01e
DM		 102 tick_nohz_restart_sched_tick();
103
104 preempt_enable_no_resched();
e0204409
DM		 105
106#ifdef CONFIG_HOTPLUG_CPU
107 if (cpu_is_offline(cpu))
108 cpu_play_dead();
109#endif
110
038cb01e
DM		 111 schedule();
112 preempt_disable();
1da177e4
LT		 113 }
114}
115
1da177e4
LT		 116void machine_halt(void)
117{
22d6a1cb 118 sstate_halt();
1da177e4
LT		 119 prom_halt();
120 panic("Halt failed!");
121}
122
1da177e4
LT		 123void machine_alt_power_off(void)
124{
22d6a1cb 125 sstate_poweroff();
1da177e4
LT		 126 prom_halt_power_off();
127 panic("Power-off failed!");
128}
129
130void machine_restart(char * cmd)
131{
132 char *p;
133
22d6a1cb 134 sstate_reboot();
1da177e4
LT		 135 p = strchr (reboot_command, '\n');
136 if (p) *p = 0;
1da177e4
LT		 137 if (cmd)
138 prom_reboot(cmd);
139 if (*reboot_command)
140 prom_reboot(reboot_command);
141 prom_reboot("");
142 panic("Reboot failed!");
143}
144
959a85ad 145#ifdef CONFIG_COMPAT
1da177e4
LT		 146static void show_regwindow32(struct pt_regs *regs)
147{
148 struct reg_window32 __user *rw;
149 struct reg_window32 r_w;
150 mm_segment_t old_fs;
151
152 __asm__ __volatile__ ("flushw");
153 rw = compat_ptr((unsigned)regs->u_regs[14]);
154 old_fs = get_fs();
155 set_fs (USER_DS);
156 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
157 set_fs (old_fs);
158 return;
159 }
160
161 set_fs (old_fs);
162 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
163 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
164 r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
165 r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
166 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
167 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
168 r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
169 r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
170}
959a85ad
DM		 171#else
172#define show_regwindow32(regs) do { } while (0)
173#endif
1da177e4
LT		 174
175static void show_regwindow(struct pt_regs *regs)
176{
177 struct reg_window __user *rw;
178 struct reg_window *rwk;
179 struct reg_window r_w;
180 mm_segment_t old_fs;
181
182 if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
183 __asm__ __volatile__ ("flushw");
184 rw = (struct reg_window __user *)
185 (regs->u_regs[14] + STACK_BIAS);
186 rwk = (struct reg_window *)
187 (regs->u_regs[14] + STACK_BIAS);
188 if (!(regs->tstate & TSTATE_PRIV)) {
189 old_fs = get_fs();
190 set_fs (USER_DS);
191 if (copy_from_user (&r_w, rw, sizeof(r_w))) {
192 set_fs (old_fs);
193 return;
194 }
195 rwk = &r_w;
196 set_fs (old_fs);
197 }
198 } else {
199 show_regwindow32(regs);
200 return;
201 }
202 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
203 rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
204 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
205 rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
206 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
207 rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
208 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
209 rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
210 if (regs->tstate & TSTATE_PRIV)
211 print_symbol("I7: <%s>\n", rwk->ins[7]);
212}
213
1da177e4
LT		 214#ifdef CONFIG_SMP
215static DEFINE_SPINLOCK(regdump_lock);
216#endif
217
218void __show_regs(struct pt_regs * regs)
219{
220#ifdef CONFIG_SMP
221 unsigned long flags;
222
223 /* Protect against xcall ipis which might lead to livelock on the lock */
224 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
225 "wrpr %0, %1, %%pstate"
226 : "=r" (flags)
227 : "i" (PSTATE_IE));
228 spin_lock(&regdump_lock);
229#endif
230 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
231 regs->tpc, regs->tnpc, regs->y, print_tainted());
232 print_symbol("TPC: <%s>\n", regs->tpc);
233 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
234 regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
235 regs->u_regs[3]);
236 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
237 regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
238 regs->u_regs[7]);
239 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
240 regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
241 regs->u_regs[11]);
242 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
243 regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
244 regs->u_regs[15]);
245 print_symbol("RPC: <%s>\n", regs->u_regs[15]);
246 show_regwindow(regs);
247#ifdef CONFIG_SMP
248 spin_unlock(&regdump_lock);
249 __asm__ __volatile__("wrpr %0, 0, %%pstate"
250 : : "r" (flags));
251#endif
252}
253
254#ifdef VERBOSE_SHOWREGS
255static void idump_from_user (unsigned int *pc)
256{
257 int i;
258 int code;
259
260 if((((unsigned long) pc) & 3))
261 return;
262
263 pc -= 3;
264 for(i = -3; i < 6; i++) {
265 get_user(code, pc);
266 printk("%c%08x%c",i?' ':'<',code,i?' ':'>');
267 pc++;
268 }
269 printk("\n");
270}
271#endif
272
273void show_regs(struct pt_regs *regs)
274{
275#ifdef VERBOSE_SHOWREGS
276 extern long etrap, etraptl1;
277#endif
278 __show_regs(regs);
19a0d585 279#if 0
1da177e4
LT		 280#ifdef CONFIG_SMP
281 {
282 extern void smp_report_regs(void);
283
284 smp_report_regs();
285 }
286#endif
19a0d585 287#endif
1da177e4
LT		 288
289#ifdef VERBOSE_SHOWREGS
290 if (regs->tpc >= &etrap && regs->tpc < &etraptl1 &&
291 regs->u_regs[14] >= (long)current - PAGE_SIZE &&
292 regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) {
293 printk ("*********parent**********\n");
294 __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF));
295 idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc);
296 printk ("*********endpar**********\n");
297 }
298#endif
299}
300
1da177e4
LT		 301unsigned long thread_saved_pc(struct task_struct *tsk)
302{
f3169641 303 struct thread_info *ti = task_thread_info(tsk);
1da177e4
LT		 304 unsigned long ret = 0xdeadbeefUL;
305
306 if (ti && ti->ksp) {
307 unsigned long *sp;
308 sp = (unsigned long *)(ti->ksp + STACK_BIAS);
309 if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
310 sp[14]) {
311 unsigned long *fp;
312 fp = (unsigned long *)(sp[14] + STACK_BIAS);
313 if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
314 ret = fp[15];
315 }
316 }
317 return ret;
318}
319
320/* Free current thread data structures etc.. */
321void exit_thread(void)
322{
323 struct thread_info *t = current_thread_info();
324
325 if (t->utraps) {
326 if (t->utraps[0] < 2)
327 kfree (t->utraps);
328 else
329 t->utraps[0]--;
330 }
331
332 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
333 t->user_cntd0 = t->user_cntd1 = NULL;
334 t->pcr_reg = 0;
335 write_pcr(0);
336 }
337}
338
339void flush_thread(void)
340{
341 struct thread_info *t = current_thread_info();
74bf4312 342 struct mm_struct *mm;
1da177e4 343
c0a79b22
MD		 344 if (test_ti_thread_flag(t, TIF_ABI_PENDING)) {
345 clear_ti_thread_flag(t, TIF_ABI_PENDING);
346 if (test_ti_thread_flag(t, TIF_32BIT))
347 clear_ti_thread_flag(t, TIF_32BIT);
348 else
349 set_ti_thread_flag(t, TIF_32BIT);
350 }
1da177e4 351
74bf4312
DM		 352 mm = t->task->mm;
353 if (mm)
98c5584c 354 tsb_context_switch(mm);
1da177e4 355
1da177e4
LT		 356 set_thread_wsaved(0);
357
358 /* Turn off performance counters if on. */
359 if (test_and_clear_thread_flag(TIF_PERFCTR)) {
360 t->user_cntd0 = t->user_cntd1 = NULL;
361 t->pcr_reg = 0;
362 write_pcr(0);
363 }
364
365 /* Clear FPU register state. */
366 t->fpsaved[0] = 0;
367
368 if (get_thread_current_ds() != ASI_AIUS)
369 set_fs(USER_DS);
1da177e4
LT		 370}
371
372/* It's a bit more tricky when 64-bit tasks are involved... */
373static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
374{
375 unsigned long fp, distance, rval;
376
377 if (!(test_thread_flag(TIF_32BIT))) {
378 csp += STACK_BIAS;
379 psp += STACK_BIAS;
380 __get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
381 fp += STACK_BIAS;
382 } else
383 __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
384
385 /* Now 8-byte align the stack as this is mandatory in the
386 * Sparc ABI due to how register windows work. This hides
387 * the restriction from thread libraries etc. -DaveM
388 */
389 csp &= ~7UL;
390
391 distance = fp - psp;
392 rval = (csp - distance);
393 if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
394 rval = 0;
395 else if (test_thread_flag(TIF_32BIT)) {
396 if (put_user(((u32)csp),
397 &(((struct reg_window32 __user *)rval)->ins[6])))
398 rval = 0;
399 } else {
400 if (put_user(((u64)csp - STACK_BIAS),
401 &(((struct reg_window __user *)rval)->ins[6])))
402 rval = 0;
403 else
404 rval = rval - STACK_BIAS;
405 }
406
407 return rval;
408}
409
410/* Standard stuff. */
411static inline void shift_window_buffer(int first_win, int last_win,
412 struct thread_info *t)
413{
414 int i;
415
416 for (i = first_win; i < last_win; i++) {
417 t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
418 memcpy(&t->reg_window[i], &t->reg_window[i+1],
419 sizeof(struct reg_window));
420 }
421}
422
423void synchronize_user_stack(void)
424{
425 struct thread_info *t = current_thread_info();
426 unsigned long window;
427
428 flush_user_windows();
429 if ((window = get_thread_wsaved()) != 0) {
430 int winsize = sizeof(struct reg_window);
431 int bias = 0;
432
433 if (test_thread_flag(TIF_32BIT))
434 winsize = sizeof(struct reg_window32);
435 else
436 bias = STACK_BIAS;
437
438 window -= 1;
439 do {
440 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
441 struct reg_window *rwin = &t->reg_window[window];
442
443 if (!copy_to_user((char __user *)sp, rwin, winsize)) {
444 shift_window_buffer(window, get_thread_wsaved() - 1, t);
445 set_thread_wsaved(get_thread_wsaved() - 1);
446 }
447 } while (window--);
448 }
449}
450
314ef685
DM		 451static void stack_unaligned(unsigned long sp)
452{
453 siginfo_t info;
454
455 info.si_signo = SIGBUS;
456 info.si_errno = 0;
457 info.si_code = BUS_ADRALN;
458 info.si_addr = (void __user *) sp;
459 info.si_trapno = 0;
460 force_sig_info(SIGBUS, &info, current);
461}
462
1da177e4
LT		 463void fault_in_user_windows(void)
464{
465 struct thread_info *t = current_thread_info();
466 unsigned long window;
467 int winsize = sizeof(struct reg_window);
468 int bias = 0;
469
470 if (test_thread_flag(TIF_32BIT))
471 winsize = sizeof(struct reg_window32);
472 else
473 bias = STACK_BIAS;
474
475 flush_user_windows();
476 window = get_thread_wsaved();
477
314ef685 478 if (likely(window != 0)) {
1da177e4
LT		 479 window -= 1;
480 do {
481 unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
482 struct reg_window *rwin = &t->reg_window[window];
483
314ef685
DM		 484 if (unlikely(sp & 0x7UL))
485 stack_unaligned(sp);
486
487 if (unlikely(copy_to_user((char __user *)sp,
488 rwin, winsize)))
1da177e4
LT		 489 goto barf;
490 } while (window--);
491 }
492 set_thread_wsaved(0);
493 return;
494
495barf:
496 set_thread_wsaved(window + 1);
497 do_exit(SIGILL);
498}
499
500asmlinkage long sparc_do_fork(unsigned long clone_flags,
501 unsigned long stack_start,
502 struct pt_regs *regs,
503 unsigned long stack_size)
504{
505 int __user *parent_tid_ptr, *child_tid_ptr;
1e38c126
DM		 506 unsigned long orig_i1 = regs->u_regs[UREG_I1];
507 long ret;
1da177e4
LT		 508
509#ifdef CONFIG_COMPAT
510 if (test_thread_flag(TIF_32BIT)) {
511 parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
512 child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
513 } else
514#endif
515 {
516 parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
517 child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
518 }
519
1e38c126
DM		 520 ret = do_fork(clone_flags, stack_start,
521 regs, stack_size,
522 parent_tid_ptr, child_tid_ptr);
523
524 /* If we get an error and potentially restart the system
525 * call, we're screwed because copy_thread() clobbered
526 * the parent's %o1. So detect that case and restore it
527 * here.
528 */
529 if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
530 regs->u_regs[UREG_I1] = orig_i1;
531
532 return ret;
1da177e4
LT		 533}
534
535/* Copy a Sparc thread. The fork() return value conventions
536 * under SunOS are nothing short of bletcherous:
537 * Parent --> %o0 == childs pid, %o1 == 0
538 * Child --> %o0 == parents pid, %o1 == 1
539 */
540int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
541 unsigned long unused,
542 struct task_struct *p, struct pt_regs *regs)
543{
ee3eea16 544 struct thread_info *t = task_thread_info(p);
1da177e4
LT		 545 char *child_trap_frame;
546
1da177e4 547 /* Calculate offset to stack_frame & pt_regs */
ee3eea16 548 child_trap_frame = task_stack_page(p) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ));
1da177e4
LT		 549 memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ));
550
551 t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
1da177e4 552 (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
db7d9a4e 553 t->new_child = 1;
1da177e4
LT		 554 t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
555 t->kregs = (struct pt_regs *)(child_trap_frame+sizeof(struct sparc_stackf));
556 t->fpsaved[0] = 0;
557
558 if (regs->tstate & TSTATE_PRIV) {
559 /* Special case, if we are spawning a kernel thread from
560 * a userspace task (via KMOD, NFS, or similar) we must
561 * disable performance counters in the child because the
562 * address space and protection realm are changing.
563 */
564 if (t->flags & _TIF_PERFCTR) {
565 t->user_cntd0 = t->user_cntd1 = NULL;
566 t->pcr_reg = 0;
567 t->flags &= ~_TIF_PERFCTR;
568 }
569 t->kregs->u_regs[UREG_FP] = t->ksp;
570 t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
571 flush_register_windows();
572 memcpy((void *)(t->ksp + STACK_BIAS),
573 (void *)(regs->u_regs[UREG_FP] + STACK_BIAS),
574 sizeof(struct sparc_stackf));
575 t->kregs->u_regs[UREG_G6] = (unsigned long) t;
576 t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
577 } else {
578 if (t->flags & _TIF_32BIT) {
579 sp &= 0x00000000ffffffffUL;
580 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
581 }
582 t->kregs->u_regs[UREG_FP] = sp;
583 t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
584 if (sp != regs->u_regs[UREG_FP]) {
585 unsigned long csp;
586
587 csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
588 if (!csp)
589 return -EFAULT;
590 t->kregs->u_regs[UREG_FP] = csp;
591 }
592 if (t->utraps)
593 t->utraps[0]++;
594 }
595
596 /* Set the return value for the child. */
597 t->kregs->u_regs[UREG_I0] = current->pid;
598 t->kregs->u_regs[UREG_I1] = 1;
599
600 /* Set the second return value for the parent. */
601 regs->u_regs[UREG_I1] = 0;
602
603 if (clone_flags & CLONE_SETTLS)
604 t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
605
606 return 0;
607}
608
609/*
610 * This is the mechanism for creating a new kernel thread.
611 *
612 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
613 * who haven't done an "execve()") should use this: it will work within
614 * a system call from a "real" process, but the process memory space will
e5dd42e4 615 * not be freed until both the parent and the child have exited.
1da177e4
LT		 616 */
617pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
618{
619 long retval;
620
621 /* If the parent runs before fn(arg) is called by the child,
622 * the input registers of this function can be clobbered.
623 * So we stash 'fn' and 'arg' into global registers which
624 * will not be modified by the parent.
625 */
626 __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
627 "mov %5, %%g3\n\t" /* Save ARG into global */
628 "mov %1, %%g1\n\t" /* Clone syscall nr. */
629 "mov %2, %%o0\n\t" /* Clone flags. */
630 "mov 0, %%o1\n\t" /* usp arg == 0 */
631 "t 0x6d\n\t" /* Linux/Sparc clone(). */
632 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
633 " mov %%o0, %0\n\t"
634 "jmpl %%g2, %%o7\n\t" /* Call the function. */
635 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
636 "mov %3, %%g1\n\t"
637 "t 0x6d\n\t" /* Linux/Sparc exit(). */
638 /* Notreached by child. */
639 "1:" :
640 "=r" (retval) :
641 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
642 "i" (__NR_exit), "r" (fn), "r" (arg) :
643 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
644 return retval;
645}
646
1da177e4
LT		 647typedef struct {
648 union {
649 unsigned int pr_regs[32];
650 unsigned long pr_dregs[16];
651 } pr_fr;
652 unsigned int __unused;
653 unsigned int pr_fsr;
654 unsigned char pr_qcnt;
655 unsigned char pr_q_entrysize;
656 unsigned char pr_en;
657 unsigned int pr_q[64];
658} elf_fpregset_t32;
659
660/*
661 * fill in the fpu structure for a core dump.
662 */
663int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
664{
665 unsigned long *kfpregs = current_thread_info()->fpregs;
666 unsigned long fprs = current_thread_info()->fpsaved[0];
667
668 if (test_thread_flag(TIF_32BIT)) {
669 elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
670
671 if (fprs & FPRS_DL)
672 memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
673 sizeof(unsigned int) * 32);
674 else
675 memset(&fpregs32->pr_fr.pr_regs[0], 0,
676 sizeof(unsigned int) * 32);
677 fpregs32->pr_qcnt = 0;
678 fpregs32->pr_q_entrysize = 8;
679 memset(&fpregs32->pr_q[0], 0,
680 (sizeof(unsigned int) * 64));
681 if (fprs & FPRS_FEF) {
682 fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
683 fpregs32->pr_en = 1;
684 } else {
685 fpregs32->pr_fsr = 0;
686 fpregs32->pr_en = 0;
687 }
688 } else {
689 if(fprs & FPRS_DL)
690 memcpy(&fpregs->pr_regs[0], kfpregs,
691 sizeof(unsigned int) * 32);
692 else
693 memset(&fpregs->pr_regs[0], 0,
694 sizeof(unsigned int) * 32);
695 if(fprs & FPRS_DU)
696 memcpy(&fpregs->pr_regs[16], kfpregs+16,
697 sizeof(unsigned int) * 32);
698 else
699 memset(&fpregs->pr_regs[16], 0,
700 sizeof(unsigned int) * 32);
701 if(fprs & FPRS_FEF) {
702 fpregs->pr_fsr = current_thread_info()->xfsr[0];
703 fpregs->pr_gsr = current_thread_info()->gsr[0];
704 } else {
705 fpregs->pr_fsr = fpregs->pr_gsr = 0;
706 }
707 fpregs->pr_fprs = fprs;
708 }
709 return 1;
710}
711
712/*
713 * sparc_execve() executes a new program after the asm stub has set
714 * things up for us. This should basically do what I want it to.
715 */
716asmlinkage int sparc_execve(struct pt_regs *regs)
717{
718 int error, base = 0;
719 char *filename;
720
721 /* User register window flush is done by entry.S */
722
723 /* Check for indirect call. */
724 if (regs->u_regs[UREG_G1] == 0)
725 base = 1;
726
727 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
728 error = PTR_ERR(filename);
729 if (IS_ERR(filename))
730 goto out;
731 error = do_execve(filename,
732 (char __user * __user *)
733 regs->u_regs[base + UREG_I1],
734 (char __user * __user *)
735 regs->u_regs[base + UREG_I2], regs);
736 putname(filename);
737 if (!error) {
738 fprs_write(0);
739 current_thread_info()->xfsr[0] = 0;
740 current_thread_info()->fpsaved[0] = 0;
741 regs->tstate &= ~TSTATE_PEF;
1da177e4
LT		 742 }
743out:
744 return error;
745}
746
747unsigned long get_wchan(struct task_struct *task)
748{
749 unsigned long pc, fp, bias = 0;
750 unsigned long thread_info_base;
751 struct reg_window *rw;
752 unsigned long ret = 0;
753 int count = 0;
754
755 if (!task || task == current ||
756 task->state == TASK_RUNNING)
757 goto out;
758
ee3eea16 759 thread_info_base = (unsigned long) task_stack_page(task);
1da177e4 760 bias = STACK_BIAS;
f3169641 761 fp = task_thread_info(task)->ksp + bias;
1da177e4
LT		 762
763 do {
764 /* Bogus frame pointer? */
765 if (fp < (thread_info_base + sizeof(struct thread_info)) ||
766 fp >= (thread_info_base + THREAD_SIZE))
767 break;
768 rw = (struct reg_window *) fp;
769 pc = rw->ins[7];
770 if (!in_sched_functions(pc)) {
771 ret = pc;
772 goto out;
773 }
774 fp = rw->ins[6] + bias;
775 } while (++count < 16);
776
777out:
778 return ret;
779}
kernel source for telekom puls (alcatel/mediatek)