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RT-AC66 3.0.0.4.374.130 core
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / arch / sparc / kernel / process.c
blob8c37f8f5adb7f0ef2d49f5910c984f22307b2951
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/smp.h>
26 #include <linux/reboot.h>
27 #include <linux/delay.h>
28 #include <linux/pm.h>
29 #include <linux/init.h>
30
31 #include <asm/auxio.h>
32 #include <asm/oplib.h>
33 #include <asm/uaccess.h>
34 #include <asm/system.h>
35 #include <asm/page.h>
36 #include <asm/pgalloc.h>
37 #include <asm/pgtable.h>
38 #include <asm/delay.h>
39 #include <asm/processor.h>
40 #include <asm/psr.h>
41 #include <asm/elf.h>
42 #include <asm/unistd.h>
43
44 /*
45 * Power management idle function
46 * Set in pm platform drivers (apc.c and pmc.c)
47 */
48 void (*pm_idle)(void);
49
50 /*
51 * Power-off handler instantiation for pm.h compliance
52 * This is done via auxio, but could be used as a fallback
53 * handler when auxio is not present-- unused for now...
54 */
55 void (*pm_power_off)(void) = machine_power_off;
56 EXPORT_SYMBOL(pm_power_off);
57
58 /*
59 * sysctl - toggle power-off restriction for serial console
60 * systems in machine_power_off()
61 */
62 int scons_pwroff = 1;
63
64 extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);
65
66 struct task_struct *last_task_used_math = NULL;
67 struct thread_info *current_set[NR_CPUS];
68
69 #ifndef CONFIG_SMP
70
71 #define SUN4C_FAULT_HIGH 100
72
73 /*
74 * the idle loop on a Sparc... ;)
75 */
76 void cpu_idle(void)
77 {
78 /* endless idle loop with no priority at all */
79 for (;;) {
80 if (ARCH_SUN4C_SUN4) {
81 static int count = HZ;
82 static unsigned long last_jiffies;
83 static unsigned long last_faults;
84 static unsigned long fps;
85 unsigned long now;
86 unsigned long faults;
87
88 extern unsigned long sun4c_kernel_faults;
89 extern void sun4c_grow_kernel_ring(void);
90
91 local_irq_disable();
92 now = jiffies;
93 count -= (now - last_jiffies);
94 last_jiffies = now;
95 if (count < 0) {
96 count += HZ;
97 faults = sun4c_kernel_faults;
98 fps = (fps + (faults - last_faults)) >> 1;
99 last_faults = faults;
100 #if 0
101 printk("kernel faults / second = %ld\n", fps);
102 #endif
103 if (fps >= SUN4C_FAULT_HIGH) {
104 sun4c_grow_kernel_ring();
105 }
106 }
107 local_irq_enable();
108 }
109
110 if (pm_idle) {
111 while (!need_resched())
112 (*pm_idle)();
113 } else {
114 while (!need_resched())
115 cpu_relax();
116 }
117 preempt_enable_no_resched();
118 schedule();
119 preempt_disable();
120 check_pgt_cache();
121 }
122 }
123
124 #else
125
126 /* This is being executed in task 0 'user space'. */
127 void cpu_idle(void)
128 {
129 set_thread_flag(TIF_POLLING_NRFLAG);
130 /* endless idle loop with no priority at all */
131 while(1) {
132 while (!need_resched())
133 cpu_relax();
134 preempt_enable_no_resched();
135 schedule();
136 preempt_disable();
137 check_pgt_cache();
138 }
139 }
140
141 #endif
142
143 extern char reboot_command [];
144
145 extern void (*prom_palette)(int);
146
147 /* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */
148 void machine_halt(void)
149 {
150 local_irq_enable();
151 mdelay(8);
152 local_irq_disable();
153 if (!serial_console && prom_palette)
154 prom_palette (1);
155 prom_halt();
156 panic("Halt failed!");
157 }
158
159 void machine_restart(char * cmd)
160 {
161 char *p;
162
163 local_irq_enable();
164 mdelay(8);
165 local_irq_disable();
166
167 p = strchr (reboot_command, '\n');
168 if (p) *p = 0;
169 if (!serial_console && prom_palette)
170 prom_palette (1);
171 if (cmd)
172 prom_reboot(cmd);
173 if (*reboot_command)
174 prom_reboot(reboot_command);
175 prom_feval ("reset");
176 panic("Reboot failed!");
177 }
178
179 void machine_power_off(void)
180 {
181 #ifdef CONFIG_SUN_AUXIO
182 if (auxio_power_register && (!serial_console || scons_pwroff))
183 *auxio_power_register |= AUXIO_POWER_OFF;
184 #endif
185 machine_halt();
186 }
187
188 static DEFINE_SPINLOCK(sparc_backtrace_lock);
189
190 void __show_backtrace(unsigned long fp)
191 {
192 struct reg_window *rw;
193 unsigned long flags;
194 int cpu = smp_processor_id();
195
196 spin_lock_irqsave(&sparc_backtrace_lock, flags);
197
198 rw = (struct reg_window *)fp;
199 while(rw && (((unsigned long) rw) >= PAGE_OFFSET) &&
200 !(((unsigned long) rw) & 0x7)) {
201 printk("CPU[%d]: ARGS[%08lx,%08lx,%08lx,%08lx,%08lx,%08lx] "
202 "FP[%08lx] CALLER[%08lx]: ", cpu,
203 rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
204 rw->ins[4], rw->ins[5],
205 rw->ins[6],
206 rw->ins[7]);
207 print_symbol("%s\n", rw->ins[7]);
208 rw = (struct reg_window *) rw->ins[6];
209 }
210 spin_unlock_irqrestore(&sparc_backtrace_lock, flags);
211 }
212
213 #define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t")
214 #define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t")
215 #define __GET_FP(fp) __asm__ __volatile__("mov %%i6, %0" : "=r" (fp))
216
217 void show_backtrace(void)
218 {
219 unsigned long fp;
220
221 __SAVE; __SAVE; __SAVE; __SAVE;
222 __SAVE; __SAVE; __SAVE; __SAVE;
223 __RESTORE; __RESTORE; __RESTORE; __RESTORE;
224 __RESTORE; __RESTORE; __RESTORE; __RESTORE;
225
226 __GET_FP(fp);
227
228 __show_backtrace(fp);
229 }
230
231 #ifdef CONFIG_SMP
232 void smp_show_backtrace_all_cpus(void)
233 {
234 xc0((smpfunc_t) show_backtrace);
235 show_backtrace();
236 }
237 #endif
238
239 #if 0
240 void show_stackframe(struct sparc_stackf *sf)
241 {
242 unsigned long size;
243 unsigned long *stk;
244 int i;
245
246 printk("l0: %08lx l1: %08lx l2: %08lx l3: %08lx "
247 "l4: %08lx l5: %08lx l6: %08lx l7: %08lx\n",
248 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3],
249 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
250 printk("i0: %08lx i1: %08lx i2: %08lx i3: %08lx "
251 "i4: %08lx i5: %08lx fp: %08lx i7: %08lx\n",
252 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3],
253 sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc);
254 printk("sp: %08lx x0: %08lx x1: %08lx x2: %08lx "
255 "x3: %08lx x4: %08lx x5: %08lx xx: %08lx\n",
256 (unsigned long)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 -= STACKFRAME_SZ;
261 stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ);
262 i = 0;
263 do {
264 printk("s%d: %08lx\n", i++, *stk++);
265 } while ((size -= sizeof(unsigned long)));
266 }
267 #endif
268
269 void show_regs(struct pt_regs *r)
270 {
271 struct reg_window *rw = (struct reg_window *) r->u_regs[14];
272
273 printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx %s\n",
274 r->psr, r->pc, r->npc, r->y, print_tainted());
275 print_symbol("PC: <%s>\n", r->pc);
276 printk("%%G: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
277 r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3],
278 r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]);
279 printk("%%O: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
280 r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11],
281 r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]);
282 print_symbol("RPC: <%s>\n", r->u_regs[15]);
283
284 printk("%%L: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
285 rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3],
286 rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
287 printk("%%I: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
288 rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
289 rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
290 }
291
292 /*
293 * The show_stack is an external API which we do not use ourselves.
294 * The oops is printed in die_if_kernel.
295 */
296 void show_stack(struct task_struct *tsk, unsigned long *_ksp)
297 {
298 unsigned long pc, fp;
299 unsigned long task_base;
300 struct reg_window *rw;
301 int count = 0;
302
303 if (tsk != NULL)
304 task_base = (unsigned long) task_stack_page(tsk);
305 else
306 task_base = (unsigned long) current_thread_info();
307
308 fp = (unsigned long) _ksp;
309 do {
310 /* Bogus frame pointer? */
311 if (fp < (task_base + sizeof(struct thread_info)) ||
312 fp >= (task_base + (PAGE_SIZE << 1)))
313 break;
314 rw = (struct reg_window *) fp;
315 pc = rw->ins[7];
316 printk("[%08lx : ", pc);
317 print_symbol("%s ] ", pc);
318 fp = rw->ins[6];
319 } while (++count < 16);
320 printk("\n");
321 }
322
323 void dump_stack(void)
324 {
325 unsigned long *ksp;
326
327 __asm__ __volatile__("mov %%fp, %0"
328 : "=r" (ksp));
329 show_stack(current, ksp);
330 }
331
332 EXPORT_SYMBOL(dump_stack);
333
334 /*
335 * Note: sparc64 has a pretty intricated thread_saved_pc, check it out.
336 */
337 unsigned long thread_saved_pc(struct task_struct *tsk)
338 {
339 return task_thread_info(tsk)->kpc;
340 }
341
342 /*
343 * Free current thread data structures etc..
344 */
345 void exit_thread(void)
346 {
347 #ifndef CONFIG_SMP
348 if(last_task_used_math == current) {
349 #else
350 if (test_thread_flag(TIF_USEDFPU)) {
351 #endif
352 /* Keep process from leaving FPU in a bogon state. */
353 put_psr(get_psr() | PSR_EF);
354 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
355 &current->thread.fpqueue[0], &current->thread.fpqdepth);
356 #ifndef CONFIG_SMP
357 last_task_used_math = NULL;
358 #else
359 clear_thread_flag(TIF_USEDFPU);
360 #endif
361 }
362 }
363
364 void flush_thread(void)
365 {
366 current_thread_info()->w_saved = 0;
367
368 /* No new signal delivery by default */
369 current->thread.new_signal = 0;
370 #ifndef CONFIG_SMP
371 if(last_task_used_math == current) {
372 #else
373 if (test_thread_flag(TIF_USEDFPU)) {
374 #endif
375 /* Clean the fpu. */
376 put_psr(get_psr() | PSR_EF);
377 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
378 &current->thread.fpqueue[0], &current->thread.fpqdepth);
379 #ifndef CONFIG_SMP
380 last_task_used_math = NULL;
381 #else
382 clear_thread_flag(TIF_USEDFPU);
383 #endif
384 }
385
386 /* Now, this task is no longer a kernel thread. */
387 current->thread.current_ds = USER_DS;
388 if (current->thread.flags & SPARC_FLAG_KTHREAD) {
389 current->thread.flags &= ~SPARC_FLAG_KTHREAD;
390
391 /* We must fixup kregs as well. */
392 /* XXX This was not fixed for ti for a while, worked. Unused? */
393 current->thread.kregs = (struct pt_regs *)
394 (task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ));
395 }
396 }
397
398 static __inline__ struct sparc_stackf __user *
399 clone_stackframe(struct sparc_stackf __user *dst,
400 struct sparc_stackf __user *src)
401 {
402 unsigned long size, fp;
403 struct sparc_stackf *tmp;
404 struct sparc_stackf __user *sp;
405
406 if (get_user(tmp, &src->fp))
407 return NULL;
408
409 fp = (unsigned long) tmp;
410 size = (fp - ((unsigned long) src));
411 fp = (unsigned long) dst;
412 sp = (struct sparc_stackf __user *)(fp - size);
413
414 /* do_fork() grabs the parent semaphore, we must release it
415 * temporarily so we can build the child clone stack frame
416 * without deadlocking.
417 */
418 if (__copy_user(sp, src, size))
419 sp = NULL;
420 else if (put_user(fp, &sp->fp))
421 sp = NULL;
422
423 return sp;
424 }
425
426 asmlinkage int sparc_do_fork(unsigned long clone_flags,
427 unsigned long stack_start,
428 struct pt_regs *regs,
429 unsigned long stack_size)
430 {
431 unsigned long parent_tid_ptr, child_tid_ptr;
432
433 parent_tid_ptr = regs->u_regs[UREG_I2];
434 child_tid_ptr = regs->u_regs[UREG_I4];
435
436 return do_fork(clone_flags, stack_start,
437 regs, stack_size,
438 (int __user *) parent_tid_ptr,
439 (int __user *) child_tid_ptr);
440 }
441
442 /* Copy a Sparc thread. The fork() return value conventions
443 * under SunOS are nothing short of bletcherous:
444 * Parent --> %o0 == childs pid, %o1 == 0
445 * Child --> %o0 == parents pid, %o1 == 1
446 *
447 * NOTE: We have a separate fork kpsr/kwim because
448 * the parent could change these values between
449 * sys_fork invocation and when we reach here
450 * if the parent should sleep while trying to
451 * allocate the task_struct and kernel stack in
452 * do_fork().
453 * XXX See comment above sys_vfork in sparc64. todo.
454 */
455 extern void ret_from_fork(void);
456
457 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
458 unsigned long unused,
459 struct task_struct *p, struct pt_regs *regs)
460 {
461 struct thread_info *ti = task_thread_info(p);
462 struct pt_regs *childregs;
463 char *new_stack;
464
465 #ifndef CONFIG_SMP
466 if(last_task_used_math == current) {
467 #else
468 if (test_thread_flag(TIF_USEDFPU)) {
469 #endif
470 put_psr(get_psr() | PSR_EF);
471 fpsave(&p->thread.float_regs[0], &p->thread.fsr,
472 &p->thread.fpqueue[0], &p->thread.fpqdepth);
473 #ifdef CONFIG_SMP
474 clear_thread_flag(TIF_USEDFPU);
475 #endif
476 }
477
478 /*
479 * p->thread_info new_stack childregs
480 * ! ! ! {if(PSR_PS) }
481 * V V (stk.fr.) V (pt_regs) { (stk.fr.) }
482 * +----- - - - - - ------+===========+============={+==========}+
483 */
484 new_stack = task_stack_page(p) + THREAD_SIZE;
485 if (regs->psr & PSR_PS)
486 new_stack -= STACKFRAME_SZ;
487 new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
488 memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
489 childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ);
490
491 /*
492 * A new process must start with interrupts closed in 2.5,
493 * because this is how Mingo's scheduler works (see schedule_tail
494 * and finish_arch_switch). If we do not do it, a timer interrupt hits
495 * before we unlock, attempts to re-take the rq->lock, and then we die.
496 * Thus, kpsr|=PSR_PIL.
497 */
498 ti->ksp = (unsigned long) new_stack;
499 ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
500 ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
501 ti->kwim = current->thread.fork_kwim;
502
503 if(regs->psr & PSR_PS) {
504 extern struct pt_regs fake_swapper_regs;
505
506 p->thread.kregs = &fake_swapper_regs;
507 new_stack += STACKFRAME_SZ + TRACEREG_SZ;
508 childregs->u_regs[UREG_FP] = (unsigned long) new_stack;
509 p->thread.flags |= SPARC_FLAG_KTHREAD;
510 p->thread.current_ds = KERNEL_DS;
511 memcpy(new_stack, (void *)regs->u_regs[UREG_FP], STACKFRAME_SZ);
512 childregs->u_regs[UREG_G6] = (unsigned long) ti;
513 } else {
514 p->thread.kregs = childregs;
515 childregs->u_regs[UREG_FP] = sp;
516 p->thread.flags &= ~SPARC_FLAG_KTHREAD;
517 p->thread.current_ds = USER_DS;
518
519 if (sp != regs->u_regs[UREG_FP]) {
520 struct sparc_stackf __user *childstack;
521 struct sparc_stackf __user *parentstack;
522
523 /*
524 * This is a clone() call with supplied user stack.
525 * Set some valid stack frames to give to the child.
526 */
527 childstack = (struct sparc_stackf __user *)
528 (sp & ~0x7UL);
529 parentstack = (struct sparc_stackf __user *)
530 regs->u_regs[UREG_FP];
531
532 #if 0
533 printk("clone: parent stack:\n");
534 show_stackframe(parentstack);
535 #endif
536
537 childstack = clone_stackframe(childstack, parentstack);
538 if (!childstack)
539 return -EFAULT;
540
541 #if 0
542 printk("clone: child stack:\n");
543 show_stackframe(childstack);
544 #endif
545
546 childregs->u_regs[UREG_FP] = (unsigned long)childstack;
547 }
548 }
549
550 #ifdef CONFIG_SMP
551 /* FPU must be disabled on SMP. */
552 childregs->psr &= ~PSR_EF;
553 #endif
554
555 /* Set the return value for the child. */
556 childregs->u_regs[UREG_I0] = current->pid;
557 childregs->u_regs[UREG_I1] = 1;
558
559 /* Set the return value for the parent. */
560 regs->u_regs[UREG_I1] = 0;
561
562 if (clone_flags & CLONE_SETTLS)
563 childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
564
565 return 0;
566 }
567
568 /*
569 * fill in the user structure for a core dump..
570 */
571 void dump_thread(struct pt_regs * regs, struct user * dump)
572 {
573 unsigned long first_stack_page;
574
575 dump->magic = SUNOS_CORE_MAGIC;
576 dump->len = sizeof(struct user);
577 dump->regs.psr = regs->psr;
578 dump->regs.pc = regs->pc;
579 dump->regs.npc = regs->npc;
580 dump->regs.y = regs->y;
581 /* fuck me plenty */
582 memcpy(&dump->regs.regs[0], &regs->u_regs[1], (sizeof(unsigned long) * 15));
583 dump->uexec = current->thread.core_exec;
584 dump->u_tsize = (((unsigned long) current->mm->end_code) -
585 ((unsigned long) current->mm->start_code)) & ~(PAGE_SIZE - 1);
586 dump->u_dsize = ((unsigned long) (current->mm->brk + (PAGE_SIZE-1)));
587 dump->u_dsize -= dump->u_tsize;
588 dump->u_dsize &= ~(PAGE_SIZE - 1);
589 first_stack_page = (regs->u_regs[UREG_FP] & ~(PAGE_SIZE - 1));
590 dump->u_ssize = (TASK_SIZE - first_stack_page) & ~(PAGE_SIZE - 1);
591 memcpy(&dump->fpu.fpstatus.fregs.regs[0], &current->thread.float_regs[0], (sizeof(unsigned long) * 32));
592 dump->fpu.fpstatus.fsr = current->thread.fsr;
593 dump->fpu.fpstatus.flags = dump->fpu.fpstatus.extra = 0;
594 dump->fpu.fpstatus.fpq_count = current->thread.fpqdepth;
595 memcpy(&dump->fpu.fpstatus.fpq[0], &current->thread.fpqueue[0],
596 ((sizeof(unsigned long) * 2) * 16));
597 dump->sigcode = 0;
598 }
599
600 /*
601 * fill in the fpu structure for a core dump.
602 */
603 int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
604 {
605 if (used_math()) {
606 memset(fpregs, 0, sizeof(*fpregs));
607 fpregs->pr_q_entrysize = 8;
608 return 1;
609 }
610 #ifdef CONFIG_SMP
611 if (test_thread_flag(TIF_USEDFPU)) {
612 put_psr(get_psr() | PSR_EF);
613 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
614 &current->thread.fpqueue[0], &current->thread.fpqdepth);
615 if (regs != NULL) {
616 regs->psr &= ~(PSR_EF);
617 clear_thread_flag(TIF_USEDFPU);
618 }
619 }
620 #else
621 if (current == last_task_used_math) {
622 put_psr(get_psr() | PSR_EF);
623 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
624 &current->thread.fpqueue[0], &current->thread.fpqdepth);
625 if (regs != NULL) {
626 regs->psr &= ~(PSR_EF);
627 last_task_used_math = NULL;
628 }
629 }
630 #endif
631 memcpy(&fpregs->pr_fr.pr_regs[0],
632 &current->thread.float_regs[0],
633 (sizeof(unsigned long) * 32));
634 fpregs->pr_fsr = current->thread.fsr;
635 fpregs->pr_qcnt = current->thread.fpqdepth;
636 fpregs->pr_q_entrysize = 8;
637 fpregs->pr_en = 1;
638 if(fpregs->pr_qcnt != 0) {
639 memcpy(&fpregs->pr_q[0],
640 &current->thread.fpqueue[0],
641 sizeof(struct fpq) * fpregs->pr_qcnt);
642 }
643 /* Zero out the rest. */
644 memset(&fpregs->pr_q[fpregs->pr_qcnt], 0,
645 sizeof(struct fpq) * (32 - fpregs->pr_qcnt));
646 return 1;
647 }
648
649 /*
650 * sparc_execve() executes a new program after the asm stub has set
651 * things up for us. This should basically do what I want it to.
652 */
653 asmlinkage int sparc_execve(struct pt_regs *regs)
654 {
655 int error, base = 0;
656 char *filename;
657
658 /* Check for indirect call. */
659 if(regs->u_regs[UREG_G1] == 0)
660 base = 1;
661
662 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
663 error = PTR_ERR(filename);
664 if(IS_ERR(filename))
665 goto out;
666 error = do_execve(filename,
667 (char __user * __user *)regs->u_regs[base + UREG_I1],
668 (char __user * __user *)regs->u_regs[base + UREG_I2],
669 regs);
670 putname(filename);
671 if (error == 0) {
672 task_lock(current);
673 current->ptrace &= ~PT_DTRACE;
674 task_unlock(current);
675 }
676 out:
677 return error;
678 }
679
680 /*
681 * This is the mechanism for creating a new kernel thread.
682 *
683 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
684 * who haven't done an "execve()") should use this: it will work within
685 * a system call from a "real" process, but the process memory space will
686 * not be freed until both the parent and the child have exited.
687 */
688 pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
689 {
690 long retval;
691
692 __asm__ __volatile__("mov %4, %%g2\n\t" /* Set aside fn ptr... */
693 "mov %5, %%g3\n\t" /* and arg. */
694 "mov %1, %%g1\n\t"
695 "mov %2, %%o0\n\t" /* Clone flags. */
696 "mov 0, %%o1\n\t" /* usp arg == 0 */
697 "t 0x10\n\t" /* Linux/Sparc clone(). */
698 "cmp %%o1, 0\n\t"
699 "be 1f\n\t" /* The parent, just return. */
700 " nop\n\t" /* Delay slot. */
701 "jmpl %%g2, %%o7\n\t" /* Call the function. */
702 " mov %%g3, %%o0\n\t" /* Get back the arg in delay. */
703 "mov %3, %%g1\n\t"
704 "t 0x10\n\t" /* Linux/Sparc exit(). */
705 /* Notreached by child. */
706 "1: mov %%o0, %0\n\t" :
707 "=r" (retval) :
708 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
709 "i" (__NR_exit), "r" (fn), "r" (arg) :
710 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
711 return retval;
712 }
713
714 unsigned long get_wchan(struct task_struct *task)
715 {
716 unsigned long pc, fp, bias = 0;
717 unsigned long task_base = (unsigned long) task;
718 unsigned long ret = 0;
719 struct reg_window *rw;
720 int count = 0;
721
722 if (!task || task == current ||
723 task->state == TASK_RUNNING)
724 goto out;
725
726 fp = task_thread_info(task)->ksp + bias;
727 do {
728 /* Bogus frame pointer? */
729 if (fp < (task_base + sizeof(struct thread_info)) ||
730 fp >= (task_base + (2 * PAGE_SIZE)))
731 break;
732 rw = (struct reg_window *) fp;
733 pc = rw->ins[7];
734 if (!in_sched_functions(pc)) {
735 ret = pc;
736 goto out;
737 }
738 fp = rw->ins[6] + bias;
739 } while (++count < 16);
740
741 out:
742 return ret;
743 }
744
Tomato firmware and modifications.