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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / arch / sparc / kernel / process.c
blob2c216ffeea90b61535eae1cd37d07b7f9acdb479
1 /* $Id: process.c,v 1.161 2002/01/23 11:27:32 davem Exp $
2 * linux/arch/sparc/kernel/process.c
3 *
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
6 */
7
8 /*
9 * This file handles the architecture-dependent parts of process handling..
10 */
11
12 #include <stdarg.h>
13
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>
20 #include <linux/stddef.h>
21 #include <linux/ptrace.h>
22 #include <linux/slab.h>
23 #include <linux/user.h>
24 #include <linux/a.out.h>
25 #include <linux/config.h>
26 #include <linux/smp.h>
27 #include <linux/smp_lock.h>
28 #include <linux/reboot.h>
29 #include <linux/delay.h>
30 #include <linux/pm.h>
31 #include <linux/init.h>
32
33 #include <asm/auxio.h>
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/delay.h>
41 #include <asm/processor.h>
42 #include <asm/psr.h>
43 #include <asm/elf.h>
44 #include <asm/unistd.h>
45
46 /*
47 * Power management idle function
48 * Set in pm platform drivers (apc.c and pmc.c)
49 */
50 void (*pm_idle)(void);
51
52 /*
53 * Power-off handler instantiation for pm.h compliance
54 * This is done via auxio, but could be used as a fallback
55 * handler when auxio is not present-- unused for now...
56 */
57 void (*pm_power_off)(void);
58
59 /*
60 * sysctl - toggle power-off restriction for serial console
61 * systems in machine_power_off()
62 */
63 int scons_pwroff = 1;
64
65 extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);
66
67 struct task_struct *last_task_used_math = NULL;
68 struct thread_info *current_set[NR_CPUS];
69
70 /*
71 * default_idle is new in 2.5. XXX Review, currently stolen from sparc64.
72 */
73 void default_idle(void)
74 {
75 }
76
77 #ifndef CONFIG_SMP
78
79 #define SUN4C_FAULT_HIGH 100
80
81 /*
82 * the idle loop on a Sparc... ;)
83 */
84 void cpu_idle(void)
85 {
86 /* endless idle loop with no priority at all */
87 for (;;) {
88 if (ARCH_SUN4C_SUN4) {
89 static int count = HZ;
90 static unsigned long last_jiffies;
91 static unsigned long last_faults;
92 static unsigned long fps;
93 unsigned long now;
94 unsigned long faults;
95 unsigned long flags;
96
97 extern unsigned long sun4c_kernel_faults;
98 extern void sun4c_grow_kernel_ring(void);
99
100 local_irq_save(flags);
101 now = jiffies;
102 count -= (now - last_jiffies);
103 last_jiffies = now;
104 if (count < 0) {
105 count += HZ;
106 faults = sun4c_kernel_faults;
107 fps = (fps + (faults - last_faults)) >> 1;
108 last_faults = faults;
109 #if 0
110 printk("kernel faults / second = %ld\n", fps);
111 #endif
112 if (fps >= SUN4C_FAULT_HIGH) {
113 sun4c_grow_kernel_ring();
114 }
115 }
116 local_irq_restore(flags);
117 }
118
119 while((!need_resched()) && pm_idle) {
120 (*pm_idle)();
121 }
122
123 schedule();
124 check_pgt_cache();
125 }
126 }
127
128 #else
129
130 /* This is being executed in task 0 'user space'. */
131 void cpu_idle(void)
132 {
133 /* endless idle loop with no priority at all */
134 while(1) {
135 if(need_resched()) {
136 schedule();
137 check_pgt_cache();
138 }
139 barrier(); /* or else gcc optimizes... */
140 }
141 }
142
143 #endif
144
145 extern char reboot_command [];
146
147 extern void (*prom_palette)(int);
148
149 /* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */
150 void machine_halt(void)
151 {
152 local_irq_enable();
153 mdelay(8);
154 local_irq_disable();
155 if (!serial_console && prom_palette)
156 prom_palette (1);
157 prom_halt();
158 panic("Halt failed!");
159 }
160
161 EXPORT_SYMBOL(machine_halt);
162
163 void machine_restart(char * cmd)
164 {
165 char *p;
166
167 local_irq_enable();
168 mdelay(8);
169 local_irq_disable();
170
171 p = strchr (reboot_command, '\n');
172 if (p) *p = 0;
173 if (!serial_console && prom_palette)
174 prom_palette (1);
175 if (cmd)
176 prom_reboot(cmd);
177 if (*reboot_command)
178 prom_reboot(reboot_command);
179 prom_feval ("reset");
180 panic("Reboot failed!");
181 }
182
183 EXPORT_SYMBOL(machine_restart);
184
185 void machine_power_off(void)
186 {
187 #ifdef CONFIG_SUN_AUXIO
188 if (auxio_power_register && (!serial_console || scons_pwroff))
189 *auxio_power_register |= AUXIO_POWER_OFF;
190 #endif
191 machine_halt();
192 }
193
194 EXPORT_SYMBOL(machine_power_off);
195
196 static DEFINE_SPINLOCK(sparc_backtrace_lock);
197
198 void __show_backtrace(unsigned long fp)
199 {
200 struct reg_window *rw;
201 unsigned long flags;
202 int cpu = smp_processor_id();
203
204 spin_lock_irqsave(&sparc_backtrace_lock, flags);
205
206 rw = (struct reg_window *)fp;
207 while(rw && (((unsigned long) rw) >= PAGE_OFFSET) &&
208 !(((unsigned long) rw) & 0x7)) {
209 printk("CPU[%d]: ARGS[%08lx,%08lx,%08lx,%08lx,%08lx,%08lx] "
210 "FP[%08lx] CALLER[%08lx]: ", cpu,
211 rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
212 rw->ins[4], rw->ins[5],
213 rw->ins[6],
214 rw->ins[7]);
215 print_symbol("%s\n", rw->ins[7]);
216 rw = (struct reg_window *) rw->ins[6];
217 }
218 spin_unlock_irqrestore(&sparc_backtrace_lock, flags);
219 }
220
221 #define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t")
222 #define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t")
223 #define __GET_FP(fp) __asm__ __volatile__("mov %%i6, %0" : "=r" (fp))
224
225 void show_backtrace(void)
226 {
227 unsigned long fp;
228
229 __SAVE; __SAVE; __SAVE; __SAVE;
230 __SAVE; __SAVE; __SAVE; __SAVE;
231 __RESTORE; __RESTORE; __RESTORE; __RESTORE;
232 __RESTORE; __RESTORE; __RESTORE; __RESTORE;
233
234 __GET_FP(fp);
235
236 __show_backtrace(fp);
237 }
238
239 #ifdef CONFIG_SMP
240 void smp_show_backtrace_all_cpus(void)
241 {
242 xc0((smpfunc_t) show_backtrace);
243 show_backtrace();
244 }
245 #endif
246
247 #if 0
248 void show_stackframe(struct sparc_stackf *sf)
249 {
250 unsigned long size;
251 unsigned long *stk;
252 int i;
253
254 printk("l0: %08lx l1: %08lx l2: %08lx l3: %08lx "
255 "l4: %08lx l5: %08lx l6: %08lx l7: %08lx\n",
256 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3],
257 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
258 printk("i0: %08lx i1: %08lx i2: %08lx i3: %08lx "
259 "i4: %08lx i5: %08lx fp: %08lx i7: %08lx\n",
260 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3],
261 sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc);
262 printk("sp: %08lx x0: %08lx x1: %08lx x2: %08lx "
263 "x3: %08lx x4: %08lx x5: %08lx xx: %08lx\n",
264 (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1],
265 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
266 sf->xxargs[0]);
267 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
268 size -= STACKFRAME_SZ;
269 stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ);
270 i = 0;
271 do {
272 printk("s%d: %08lx\n", i++, *stk++);
273 } while ((size -= sizeof(unsigned long)));
274 }
275 #endif
276
277 void show_regs(struct pt_regs *r)
278 {
279 struct reg_window *rw = (struct reg_window *) r->u_regs[14];
280
281 printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx %s\n",
282 r->psr, r->pc, r->npc, r->y, print_tainted());
283 print_symbol("PC: <%s>\n", r->pc);
284 printk("%%G: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
285 r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3],
286 r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]);
287 printk("%%O: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
288 r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11],
289 r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]);
290 print_symbol("RPC: <%s>\n", r->u_regs[15]);
291
292 printk("%%L: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
293 rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3],
294 rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
295 printk("%%I: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
296 rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
297 rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
298 }
299
300 /*
301 * The show_stack is an external API which we do not use ourselves.
302 * The oops is printed in die_if_kernel.
303 */
304 void show_stack(struct task_struct *tsk, unsigned long *_ksp)
305 {
306 unsigned long pc, fp;
307 unsigned long task_base;
308 struct reg_window *rw;
309 int count = 0;
310
311 if (tsk != NULL)
312 task_base = (unsigned long) tsk->thread_info;
313 else
314 task_base = (unsigned long) current_thread_info();
315
316 fp = (unsigned long) _ksp;
317 do {
318 /* Bogus frame pointer? */
319 if (fp < (task_base + sizeof(struct thread_info)) ||
320 fp >= (task_base + (PAGE_SIZE << 1)))
321 break;
322 rw = (struct reg_window *) fp;
323 pc = rw->ins[7];
324 printk("[%08lx : ", pc);
325 print_symbol("%s ] ", pc);
326 fp = rw->ins[6];
327 } while (++count < 16);
328 printk("\n");
329 }
330
331 void dump_stack(void)
332 {
333 unsigned long *ksp;
334
335 __asm__ __volatile__("mov %%fp, %0"
336 : "=r" (ksp));
337 show_stack(current, ksp);
338 }
339
340 EXPORT_SYMBOL(dump_stack);
341
342 /*
343 * Note: sparc64 has a pretty intricated thread_saved_pc, check it out.
344 */
345 unsigned long thread_saved_pc(struct task_struct *tsk)
346 {
347 return tsk->thread_info->kpc;
348 }
349
350 /*
351 * Free current thread data structures etc..
352 */
353 void exit_thread(void)
354 {
355 #ifndef CONFIG_SMP
356 if(last_task_used_math == current) {
357 #else
358 if(current_thread_info()->flags & _TIF_USEDFPU) {
359 #endif
360 /* Keep process from leaving FPU in a bogon state. */
361 put_psr(get_psr() | PSR_EF);
362 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
363 &current->thread.fpqueue[0], &current->thread.fpqdepth);
364 #ifndef CONFIG_SMP
365 last_task_used_math = NULL;
366 #else
367 current_thread_info()->flags &= ~_TIF_USEDFPU;
368 #endif
369 }
370 }
371
372 void flush_thread(void)
373 {
374 current_thread_info()->w_saved = 0;
375
376 /* No new signal delivery by default */
377 current->thread.new_signal = 0;
378 #ifndef CONFIG_SMP
379 if(last_task_used_math == current) {
380 #else
381 if(current_thread_info()->flags & _TIF_USEDFPU) {
382 #endif
383 /* Clean the fpu. */
384 put_psr(get_psr() | PSR_EF);
385 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
386 &current->thread.fpqueue[0], &current->thread.fpqdepth);
387 #ifndef CONFIG_SMP
388 last_task_used_math = NULL;
389 #else
390 current_thread_info()->flags &= ~_TIF_USEDFPU;
391 #endif
392 }
393
394 /* Now, this task is no longer a kernel thread. */
395 current->thread.current_ds = USER_DS;
396 if (current->thread.flags & SPARC_FLAG_KTHREAD) {
397 current->thread.flags &= ~SPARC_FLAG_KTHREAD;
398
399 /* We must fixup kregs as well. */
400 /* XXX This was not fixed for ti for a while, worked. Unused? */
401 current->thread.kregs = (struct pt_regs *)
402 ((char *)current->thread_info + (THREAD_SIZE - TRACEREG_SZ));
403 }
404 }
405
406 static __inline__ struct sparc_stackf __user *
407 clone_stackframe(struct sparc_stackf __user *dst,
408 struct sparc_stackf __user *src)
409 {
410 unsigned long size, fp;
411 struct sparc_stackf *tmp;
412 struct sparc_stackf __user *sp;
413
414 if (get_user(tmp, &src->fp))
415 return NULL;
416
417 fp = (unsigned long) tmp;
418 size = (fp - ((unsigned long) src));
419 fp = (unsigned long) dst;
420 sp = (struct sparc_stackf __user *)(fp - size);
421
422 /* do_fork() grabs the parent semaphore, we must release it
423 * temporarily so we can build the child clone stack frame
424 * without deadlocking.
425 */
426 if (__copy_user(sp, src, size))
427 sp = NULL;
428 else if (put_user(fp, &sp->fp))
429 sp = NULL;
430
431 return sp;
432 }
433
434 asmlinkage int sparc_do_fork(unsigned long clone_flags,
435 unsigned long stack_start,
436 struct pt_regs *regs,
437 unsigned long stack_size)
438 {
439 unsigned long parent_tid_ptr, child_tid_ptr;
440
441 parent_tid_ptr = regs->u_regs[UREG_I2];
442 child_tid_ptr = regs->u_regs[UREG_I4];
443
444 return do_fork(clone_flags, stack_start,
445 regs, stack_size,
446 (int __user *) parent_tid_ptr,
447 (int __user *) child_tid_ptr);
448 }
449
450 /* Copy a Sparc thread. The fork() return value conventions
451 * under SunOS are nothing short of bletcherous:
452 * Parent --> %o0 == childs pid, %o1 == 0
453 * Child --> %o0 == parents pid, %o1 == 1
454 *
455 * NOTE: We have a separate fork kpsr/kwim because
456 * the parent could change these values between
457 * sys_fork invocation and when we reach here
458 * if the parent should sleep while trying to
459 * allocate the task_struct and kernel stack in
460 * do_fork().
461 * XXX See comment above sys_vfork in sparc64. todo.
462 */
463 extern void ret_from_fork(void);
464
465 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
466 unsigned long unused,
467 struct task_struct *p, struct pt_regs *regs)
468 {
469 struct thread_info *ti = p->thread_info;
470 struct pt_regs *childregs;
471 char *new_stack;
472
473 #ifndef CONFIG_SMP
474 if(last_task_used_math == current) {
475 #else
476 if(current_thread_info()->flags & _TIF_USEDFPU) {
477 #endif
478 put_psr(get_psr() | PSR_EF);
479 fpsave(&p->thread.float_regs[0], &p->thread.fsr,
480 &p->thread.fpqueue[0], &p->thread.fpqdepth);
481 #ifdef CONFIG_SMP
482 current_thread_info()->flags &= ~_TIF_USEDFPU;
483 #endif
484 }
485
486 /*
487 * p->thread_info new_stack childregs
488 * ! ! ! {if(PSR_PS) }
489 * V V (stk.fr.) V (pt_regs) { (stk.fr.) }
490 * +----- - - - - - ------+===========+============={+==========}+
491 */
492 new_stack = (char*)ti + THREAD_SIZE;
493 if (regs->psr & PSR_PS)
494 new_stack -= STACKFRAME_SZ;
495 new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
496 memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
497 childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ);
498
499 /*
500 * A new process must start with interrupts closed in 2.5,
501 * because this is how Mingo's scheduler works (see schedule_tail
502 * and finish_arch_switch). If we do not do it, a timer interrupt hits
503 * before we unlock, attempts to re-take the rq->lock, and then we die.
504 * Thus, kpsr|=PSR_PIL.
505 */
506 ti->ksp = (unsigned long) new_stack;
507 ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
508 ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
509 ti->kwim = current->thread.fork_kwim;
510
511 if(regs->psr & PSR_PS) {
512 extern struct pt_regs fake_swapper_regs;
513
514 p->thread.kregs = &fake_swapper_regs;
515 new_stack += STACKFRAME_SZ + TRACEREG_SZ;
516 childregs->u_regs[UREG_FP] = (unsigned long) new_stack;
517 p->thread.flags |= SPARC_FLAG_KTHREAD;
518 p->thread.current_ds = KERNEL_DS;
519 memcpy(new_stack, (void *)regs->u_regs[UREG_FP], STACKFRAME_SZ);
520 childregs->u_regs[UREG_G6] = (unsigned long) ti;
521 } else {
522 p->thread.kregs = childregs;
523 childregs->u_regs[UREG_FP] = sp;
524 p->thread.flags &= ~SPARC_FLAG_KTHREAD;
525 p->thread.current_ds = USER_DS;
526
527 if (sp != regs->u_regs[UREG_FP]) {
528 struct sparc_stackf __user *childstack;
529 struct sparc_stackf __user *parentstack;
530
531 /*
532 * This is a clone() call with supplied user stack.
533 * Set some valid stack frames to give to the child.
534 */
535 childstack = (struct sparc_stackf __user *)
536 (sp & ~0x7UL);
537 parentstack = (struct sparc_stackf __user *)
538 regs->u_regs[UREG_FP];
539
540 #if 0
541 printk("clone: parent stack:\n");
542 show_stackframe(parentstack);
543 #endif
544
545 childstack = clone_stackframe(childstack, parentstack);
546 if (!childstack)
547 return -EFAULT;
548
549 #if 0
550 printk("clone: child stack:\n");
551 show_stackframe(childstack);
552 #endif
553
554 childregs->u_regs[UREG_FP] = (unsigned long)childstack;
555 }
556 }
557
558 #ifdef CONFIG_SMP
559 /* FPU must be disabled on SMP. */
560 childregs->psr &= ~PSR_EF;
561 #endif
562
563 /* Set the return value for the child. */
564 childregs->u_regs[UREG_I0] = current->pid;
565 childregs->u_regs[UREG_I1] = 1;
566
567 /* Set the return value for the parent. */
568 regs->u_regs[UREG_I1] = 0;
569
570 if (clone_flags & CLONE_SETTLS)
571 childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
572
573 return 0;
574 }
575
576 /*
577 * fill in the user structure for a core dump..
578 */
579 void dump_thread(struct pt_regs * regs, struct user * dump)
580 {
581 unsigned long first_stack_page;
582
583 dump->magic = SUNOS_CORE_MAGIC;
584 dump->len = sizeof(struct user);
585 dump->regs.psr = regs->psr;
586 dump->regs.pc = regs->pc;
587 dump->regs.npc = regs->npc;
588 dump->regs.y = regs->y;
589 /* fuck me plenty */
590 memcpy(&dump->regs.regs[0], &regs->u_regs[1], (sizeof(unsigned long) * 15));
591 dump->uexec = current->thread.core_exec;
592 dump->u_tsize = (((unsigned long) current->mm->end_code) -
593 ((unsigned long) current->mm->start_code)) & ~(PAGE_SIZE - 1);
594 dump->u_dsize = ((unsigned long) (current->mm->brk + (PAGE_SIZE-1)));
595 dump->u_dsize -= dump->u_tsize;
596 dump->u_dsize &= ~(PAGE_SIZE - 1);
597 first_stack_page = (regs->u_regs[UREG_FP] & ~(PAGE_SIZE - 1));
598 dump->u_ssize = (TASK_SIZE - first_stack_page) & ~(PAGE_SIZE - 1);
599 memcpy(&dump->fpu.fpstatus.fregs.regs[0], &current->thread.float_regs[0], (sizeof(unsigned long) * 32));
600 dump->fpu.fpstatus.fsr = current->thread.fsr;
601 dump->fpu.fpstatus.flags = dump->fpu.fpstatus.extra = 0;
602 dump->fpu.fpstatus.fpq_count = current->thread.fpqdepth;
603 memcpy(&dump->fpu.fpstatus.fpq[0], &current->thread.fpqueue[0],
604 ((sizeof(unsigned long) * 2) * 16));
605 dump->sigcode = 0;
606 }
607
608 /*
609 * fill in the fpu structure for a core dump.
610 */
611 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
612 {
613 if (used_math()) {
614 memset(fpregs, 0, sizeof(*fpregs));
615 fpregs->pr_q_entrysize = 8;
616 return 1;
617 }
618 #ifdef CONFIG_SMP
619 if (current_thread_info()->flags & _TIF_USEDFPU) {
620 put_psr(get_psr() | PSR_EF);
621 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
622 &current->thread.fpqueue[0], &current->thread.fpqdepth);
623 if (regs != NULL) {
624 regs->psr &= ~(PSR_EF);
625 current_thread_info()->flags &= ~(_TIF_USEDFPU);
626 }
627 }
628 #else
629 if (current == last_task_used_math) {
630 put_psr(get_psr() | PSR_EF);
631 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
632 &current->thread.fpqueue[0], &current->thread.fpqdepth);
633 if (regs != NULL) {
634 regs->psr &= ~(PSR_EF);
635 last_task_used_math = NULL;
636 }
637 }
638 #endif
639 memcpy(&fpregs->pr_fr.pr_regs[0],
640 &current->thread.float_regs[0],
641 (sizeof(unsigned long) * 32));
642 fpregs->pr_fsr = current->thread.fsr;
643 fpregs->pr_qcnt = current->thread.fpqdepth;
644 fpregs->pr_q_entrysize = 8;
645 fpregs->pr_en = 1;
646 if(fpregs->pr_qcnt != 0) {
647 memcpy(&fpregs->pr_q[0],
648 &current->thread.fpqueue[0],
649 sizeof(struct fpq) * fpregs->pr_qcnt);
650 }
651 /* Zero out the rest. */
652 memset(&fpregs->pr_q[fpregs->pr_qcnt], 0,
653 sizeof(struct fpq) * (32 - fpregs->pr_qcnt));
654 return 1;
655 }
656
657 /*
658 * sparc_execve() executes a new program after the asm stub has set
659 * things up for us. This should basically do what I want it to.
660 */
661 asmlinkage int sparc_execve(struct pt_regs *regs)
662 {
663 int error, base = 0;
664 char *filename;
665
666 /* Check for indirect call. */
667 if(regs->u_regs[UREG_G1] == 0)
668 base = 1;
669
670 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
671 error = PTR_ERR(filename);
672 if(IS_ERR(filename))
673 goto out;
674 error = do_execve(filename,
675 (char __user * __user *)regs->u_regs[base + UREG_I1],
676 (char __user * __user *)regs->u_regs[base + UREG_I2],
677 regs);
678 putname(filename);
679 if (error == 0) {
680 task_lock(current);
681 current->ptrace &= ~PT_DTRACE;
682 task_unlock(current);
683 }
684 out:
685 return error;
686 }
687
688 /*
689 * This is the mechanism for creating a new kernel thread.
690 *
691 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
692 * who haven't done an "execve()") should use this: it will work within
693 * a system call from a "real" process, but the process memory space will
694 * not be free'd until both the parent and the child have exited.
695 */
696 pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
697 {
698 long retval;
699
700 __asm__ __volatile__("mov %4, %%g2\n\t" /* Set aside fn ptr... */
701 "mov %5, %%g3\n\t" /* and arg. */
702 "mov %1, %%g1\n\t"
703 "mov %2, %%o0\n\t" /* Clone flags. */
704 "mov 0, %%o1\n\t" /* usp arg == 0 */
705 "t 0x10\n\t" /* Linux/Sparc clone(). */
706 "cmp %%o1, 0\n\t"
707 "be 1f\n\t" /* The parent, just return. */
708 " nop\n\t" /* Delay slot. */
709 "jmpl %%g2, %%o7\n\t" /* Call the function. */
710 " mov %%g3, %%o0\n\t" /* Get back the arg in delay. */
711 "mov %3, %%g1\n\t"
712 "t 0x10\n\t" /* Linux/Sparc exit(). */
713 /* Notreached by child. */
714 "1: mov %%o0, %0\n\t" :
715 "=r" (retval) :
716 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
717 "i" (__NR_exit), "r" (fn), "r" (arg) :
718 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
719 return retval;
720 }
721
722 unsigned long get_wchan(struct task_struct *task)
723 {
724 unsigned long pc, fp, bias = 0;
725 unsigned long task_base = (unsigned long) task;
726 unsigned long ret = 0;
727 struct reg_window *rw;
728 int count = 0;
729
730 if (!task || task == current ||
731 task->state == TASK_RUNNING)
732 goto out;
733
734 fp = task->thread_info->ksp + bias;
735 do {
736 /* Bogus frame pointer? */
737 if (fp < (task_base + sizeof(struct thread_info)) ||
738 fp >= (task_base + (2 * PAGE_SIZE)))
739 break;
740 rw = (struct reg_window *) fp;
741 pc = rw->ins[7];
742 if (!in_sched_functions(pc)) {
743 ret = pc;
744 goto out;
745 }
746 fp = rw->ins[6] + bias;
747 } while (++count < 16);
748
749 out:
750 return ret;
751 }
752
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