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1/* linux/arch/sparc/kernel/process.c
2 *
3 * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
4 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
5 */
6
7/*
8 * This file handles the architecture-dependent parts of process handling..
9 */
10
11#include <stdarg.h>
12
13#include <linux/errno.h>
14#include <linux/module.h>
15#include <linux/sched.h>
16#include <linux/kernel.h>
17#include <linux/mm.h>
18#include <linux/stddef.h>
19#include <linux/ptrace.h>
20#include <linux/user.h>
21#include <linux/smp.h>
22#include <linux/reboot.h>
23#include <linux/delay.h>
24#include <linux/pm.h>
25#include <linux/init.h>
26#include <linux/slab.h>
27
28#include <asm/auxio.h>
29#include <asm/oplib.h>
30#include <asm/uaccess.h>
31#include <asm/page.h>
32#include <asm/pgalloc.h>
33#include <asm/pgtable.h>
34#include <asm/delay.h>
35#include <asm/processor.h>
36#include <asm/psr.h>
37#include <asm/elf.h>
38#include <asm/prom.h>
39#include <asm/unistd.h>
40#include <asm/setup.h>
41
42/*
43 * Power management idle function
44 * Set in pm platform drivers (apc.c and pmc.c)
45 */
46void (*pm_idle)(void);
47EXPORT_SYMBOL(pm_idle);
48
49/*
50 * Power-off handler instantiation for pm.h compliance
51 * This is done via auxio, but could be used as a fallback
52 * handler when auxio is not present-- unused for now...
53 */
54void (*pm_power_off)(void) = machine_power_off;
55EXPORT_SYMBOL(pm_power_off);
56
57/*
58 * sysctl - toggle power-off restriction for serial console
59 * systems in machine_power_off()
60 */
61int scons_pwroff = 1;
62
63extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);
64
65struct task_struct *last_task_used_math = NULL;
66struct thread_info *current_set[NR_CPUS];
67
68/*
69 * the idle loop on a Sparc... ;)
70 */
71void cpu_idle(void)
72{
73 set_thread_flag(TIF_POLLING_NRFLAG);
74
75 /* endless idle loop with no priority at all */
76 for (;;) {
77 while (!need_resched()) {
78 if (pm_idle)
79 (*pm_idle)();
80 else
81 cpu_relax();
82 }
83 schedule_preempt_disabled();
84 }
85}
86
87/* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */
88void machine_halt(void)
89{
90 local_irq_enable();
91 mdelay(8);
92 local_irq_disable();
93 prom_halt();
94 panic("Halt failed!");
95}
96
97void machine_restart(char * cmd)
98{
99 char *p;
100
101 local_irq_enable();
102 mdelay(8);
103 local_irq_disable();
104
105 p = strchr (reboot_command, '\n');
106 if (p) *p = 0;
107 if (cmd)
108 prom_reboot(cmd);
109 if (*reboot_command)
110 prom_reboot(reboot_command);
111 prom_feval ("reset");
112 panic("Reboot failed!");
113}
114
115void machine_power_off(void)
116{
117 if (auxio_power_register &&
118 (strcmp(of_console_device->type, "serial") || scons_pwroff))
119 *auxio_power_register |= AUXIO_POWER_OFF;
120 machine_halt();
121}
122
123void show_regs(struct pt_regs *r)
124{
125 struct reg_window32 *rw = (struct reg_window32 *) r->u_regs[14];
126
127 printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx %s\n",
128 r->psr, r->pc, r->npc, r->y, print_tainted());
129 printk("PC: <%pS>\n", (void *) r->pc);
130 printk("%%G: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
131 r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3],
132 r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]);
133 printk("%%O: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
134 r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11],
135 r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]);
136 printk("RPC: <%pS>\n", (void *) r->u_regs[15]);
137
138 printk("%%L: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
139 rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3],
140 rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
141 printk("%%I: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
142 rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
143 rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
144}
145
146/*
147 * The show_stack is an external API which we do not use ourselves.
148 * The oops is printed in die_if_kernel.
149 */
150void show_stack(struct task_struct *tsk, unsigned long *_ksp)
151{
152 unsigned long pc, fp;
153 unsigned long task_base;
154 struct reg_window32 *rw;
155 int count = 0;
156
157 if (tsk != NULL)
158 task_base = (unsigned long) task_stack_page(tsk);
159 else
160 task_base = (unsigned long) current_thread_info();
161
162 fp = (unsigned long) _ksp;
163 do {
164 /* Bogus frame pointer? */
165 if (fp < (task_base + sizeof(struct thread_info)) ||
166 fp >= (task_base + (PAGE_SIZE << 1)))
167 break;
168 rw = (struct reg_window32 *) fp;
169 pc = rw->ins[7];
170 printk("[%08lx : ", pc);
171 printk("%pS ] ", (void *) pc);
172 fp = rw->ins[6];
173 } while (++count < 16);
174 printk("\n");
175}
176
177void dump_stack(void)
178{
179 unsigned long *ksp;
180
181 __asm__ __volatile__("mov %%fp, %0"
182 : "=r" (ksp));
183 show_stack(current, ksp);
184}
185
186EXPORT_SYMBOL(dump_stack);
187
188/*
189 * Note: sparc64 has a pretty intricated thread_saved_pc, check it out.
190 */
191unsigned long thread_saved_pc(struct task_struct *tsk)
192{
193 return task_thread_info(tsk)->kpc;
194}
195
196/*
197 * Free current thread data structures etc..
198 */
199void exit_thread(void)
200{
201#ifndef CONFIG_SMP
202 if(last_task_used_math == current) {
203#else
204 if (test_thread_flag(TIF_USEDFPU)) {
205#endif
206 /* Keep process from leaving FPU in a bogon state. */
207 put_psr(get_psr() | PSR_EF);
208 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
209 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
210#ifndef CONFIG_SMP
211 last_task_used_math = NULL;
212#else
213 clear_thread_flag(TIF_USEDFPU);
214#endif
215 }
216}
217
218void flush_thread(void)
219{
220 current_thread_info()->w_saved = 0;
221
222#ifndef CONFIG_SMP
223 if(last_task_used_math == current) {
224#else
225 if (test_thread_flag(TIF_USEDFPU)) {
226#endif
227 /* Clean the fpu. */
228 put_psr(get_psr() | PSR_EF);
229 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
230 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
231#ifndef CONFIG_SMP
232 last_task_used_math = NULL;
233#else
234 clear_thread_flag(TIF_USEDFPU);
235#endif
236 }
237
238 /* This task is no longer a kernel thread. */
239 if (current->thread.flags & SPARC_FLAG_KTHREAD) {
240 current->thread.flags &= ~SPARC_FLAG_KTHREAD;
241
242 /* We must fixup kregs as well. */
243 /* XXX This was not fixed for ti for a while, worked. Unused? */
244 current->thread.kregs = (struct pt_regs *)
245 (task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ));
246 }
247}
248
249static inline struct sparc_stackf __user *
250clone_stackframe(struct sparc_stackf __user *dst,
251 struct sparc_stackf __user *src)
252{
253 unsigned long size, fp;
254 struct sparc_stackf *tmp;
255 struct sparc_stackf __user *sp;
256
257 if (get_user(tmp, &src->fp))
258 return NULL;
259
260 fp = (unsigned long) tmp;
261 size = (fp - ((unsigned long) src));
262 fp = (unsigned long) dst;
263 sp = (struct sparc_stackf __user *)(fp - size);
264
265 /* do_fork() grabs the parent semaphore, we must release it
266 * temporarily so we can build the child clone stack frame
267 * without deadlocking.
268 */
269 if (__copy_user(sp, src, size))
270 sp = NULL;
271 else if (put_user(fp, &sp->fp))
272 sp = NULL;
273
274 return sp;
275}
276
277asmlinkage int sparc_do_fork(unsigned long clone_flags,
278 unsigned long stack_start,
279 struct pt_regs *regs,
280 unsigned long stack_size)
281{
282 unsigned long parent_tid_ptr, child_tid_ptr;
283 unsigned long orig_i1 = regs->u_regs[UREG_I1];
284 long ret;
285
286 parent_tid_ptr = regs->u_regs[UREG_I2];
287 child_tid_ptr = regs->u_regs[UREG_I4];
288
289 ret = do_fork(clone_flags, stack_start,
290 regs, stack_size,
291 (int __user *) parent_tid_ptr,
292 (int __user *) child_tid_ptr);
293
294 /* If we get an error and potentially restart the system
295 * call, we're screwed because copy_thread() clobbered
296 * the parent's %o1. So detect that case and restore it
297 * here.
298 */
299 if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
300 regs->u_regs[UREG_I1] = orig_i1;
301
302 return ret;
303}
304
305/* Copy a Sparc thread. The fork() return value conventions
306 * under SunOS are nothing short of bletcherous:
307 * Parent --> %o0 == childs pid, %o1 == 0
308 * Child --> %o0 == parents pid, %o1 == 1
309 *
310 * NOTE: We have a separate fork kpsr/kwim because
311 * the parent could change these values between
312 * sys_fork invocation and when we reach here
313 * if the parent should sleep while trying to
314 * allocate the task_struct and kernel stack in
315 * do_fork().
316 * XXX See comment above sys_vfork in sparc64. todo.
317 */
318extern void ret_from_fork(void);
319
320int copy_thread(unsigned long clone_flags, unsigned long sp,
321 unsigned long unused,
322 struct task_struct *p, struct pt_regs *regs)
323{
324 struct thread_info *ti = task_thread_info(p);
325 struct pt_regs *childregs;
326 char *new_stack;
327
328#ifndef CONFIG_SMP
329 if(last_task_used_math == current) {
330#else
331 if (test_thread_flag(TIF_USEDFPU)) {
332#endif
333 put_psr(get_psr() | PSR_EF);
334 fpsave(&p->thread.float_regs[0], &p->thread.fsr,
335 &p->thread.fpqueue[0], &p->thread.fpqdepth);
336#ifdef CONFIG_SMP
337 clear_thread_flag(TIF_USEDFPU);
338#endif
339 }
340
341 /*
342 * p->thread_info new_stack childregs
343 * ! ! ! {if(PSR_PS) }
344 * V V (stk.fr.) V (pt_regs) { (stk.fr.) }
345 * +----- - - - - - ------+===========+============={+==========}+
346 */
347 new_stack = task_stack_page(p) + THREAD_SIZE;
348 if (regs->psr & PSR_PS)
349 new_stack -= STACKFRAME_SZ;
350 new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
351 memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
352 childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ);
353
354 /*
355 * A new process must start with interrupts closed in 2.5,
356 * because this is how Mingo's scheduler works (see schedule_tail
357 * and finish_arch_switch). If we do not do it, a timer interrupt hits
358 * before we unlock, attempts to re-take the rq->lock, and then we die.
359 * Thus, kpsr|=PSR_PIL.
360 */
361 ti->ksp = (unsigned long) new_stack;
362 ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
363 ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
364 ti->kwim = current->thread.fork_kwim;
365
366 if(regs->psr & PSR_PS) {
367 extern struct pt_regs fake_swapper_regs;
368
369 p->thread.kregs = &fake_swapper_regs;
370 new_stack += STACKFRAME_SZ + TRACEREG_SZ;
371 childregs->u_regs[UREG_FP] = (unsigned long) new_stack;
372 p->thread.flags |= SPARC_FLAG_KTHREAD;
373 p->thread.current_ds = KERNEL_DS;
374 memcpy(new_stack, (void *)regs->u_regs[UREG_FP], STACKFRAME_SZ);
375 childregs->u_regs[UREG_G6] = (unsigned long) ti;
376 } else {
377 p->thread.kregs = childregs;
378 childregs->u_regs[UREG_FP] = sp;
379 p->thread.flags &= ~SPARC_FLAG_KTHREAD;
380 p->thread.current_ds = USER_DS;
381
382 if (sp != regs->u_regs[UREG_FP]) {
383 struct sparc_stackf __user *childstack;
384 struct sparc_stackf __user *parentstack;
385
386 /*
387 * This is a clone() call with supplied user stack.
388 * Set some valid stack frames to give to the child.
389 */
390 childstack = (struct sparc_stackf __user *)
391 (sp & ~0xfUL);
392 parentstack = (struct sparc_stackf __user *)
393 regs->u_regs[UREG_FP];
394
395#if 0
396 printk("clone: parent stack:\n");
397 show_stackframe(parentstack);
398#endif
399
400 childstack = clone_stackframe(childstack, parentstack);
401 if (!childstack)
402 return -EFAULT;
403
404#if 0
405 printk("clone: child stack:\n");
406 show_stackframe(childstack);
407#endif
408
409 childregs->u_regs[UREG_FP] = (unsigned long)childstack;
410 }
411 }
412
413#ifdef CONFIG_SMP
414 /* FPU must be disabled on SMP. */
415 childregs->psr &= ~PSR_EF;
416#endif
417
418 /* Set the return value for the child. */
419 childregs->u_regs[UREG_I0] = current->pid;
420 childregs->u_regs[UREG_I1] = 1;
421
422 /* Set the return value for the parent. */
423 regs->u_regs[UREG_I1] = 0;
424
425 if (clone_flags & CLONE_SETTLS)
426 childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
427
428 return 0;
429}
430
431/*
432 * fill in the fpu structure for a core dump.
433 */
434int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
435{
436 if (used_math()) {
437 memset(fpregs, 0, sizeof(*fpregs));
438 fpregs->pr_q_entrysize = 8;
439 return 1;
440 }
441#ifdef CONFIG_SMP
442 if (test_thread_flag(TIF_USEDFPU)) {
443 put_psr(get_psr() | PSR_EF);
444 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
445 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
446 if (regs != NULL) {
447 regs->psr &= ~(PSR_EF);
448 clear_thread_flag(TIF_USEDFPU);
449 }
450 }
451#else
452 if (current == last_task_used_math) {
453 put_psr(get_psr() | PSR_EF);
454 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
455 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
456 if (regs != NULL) {
457 regs->psr &= ~(PSR_EF);
458 last_task_used_math = NULL;
459 }
460 }
461#endif
462 memcpy(&fpregs->pr_fr.pr_regs[0],
463 ¤t->thread.float_regs[0],
464 (sizeof(unsigned long) * 32));
465 fpregs->pr_fsr = current->thread.fsr;
466 fpregs->pr_qcnt = current->thread.fpqdepth;
467 fpregs->pr_q_entrysize = 8;
468 fpregs->pr_en = 1;
469 if(fpregs->pr_qcnt != 0) {
470 memcpy(&fpregs->pr_q[0],
471 ¤t->thread.fpqueue[0],
472 sizeof(struct fpq) * fpregs->pr_qcnt);
473 }
474 /* Zero out the rest. */
475 memset(&fpregs->pr_q[fpregs->pr_qcnt], 0,
476 sizeof(struct fpq) * (32 - fpregs->pr_qcnt));
477 return 1;
478}
479
480/*
481 * sparc_execve() executes a new program after the asm stub has set
482 * things up for us. This should basically do what I want it to.
483 */
484asmlinkage int sparc_execve(struct pt_regs *regs)
485{
486 int error, base = 0;
487 char *filename;
488
489 /* Check for indirect call. */
490 if(regs->u_regs[UREG_G1] == 0)
491 base = 1;
492
493 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
494 error = PTR_ERR(filename);
495 if(IS_ERR(filename))
496 goto out;
497 error = do_execve(filename,
498 (const char __user *const __user *)
499 regs->u_regs[base + UREG_I1],
500 (const char __user *const __user *)
501 regs->u_regs[base + UREG_I2],
502 regs);
503 putname(filename);
504out:
505 return error;
506}
507
508/*
509 * This is the mechanism for creating a new kernel thread.
510 *
511 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
512 * who haven't done an "execve()") should use this: it will work within
513 * a system call from a "real" process, but the process memory space will
514 * not be freed until both the parent and the child have exited.
515 */
516pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
517{
518 long retval;
519
520 __asm__ __volatile__("mov %4, %%g2\n\t" /* Set aside fn ptr... */
521 "mov %5, %%g3\n\t" /* and arg. */
522 "mov %1, %%g1\n\t"
523 "mov %2, %%o0\n\t" /* Clone flags. */
524 "mov 0, %%o1\n\t" /* usp arg == 0 */
525 "t 0x10\n\t" /* Linux/Sparc clone(). */
526 "cmp %%o1, 0\n\t"
527 "be 1f\n\t" /* The parent, just return. */
528 " nop\n\t" /* Delay slot. */
529 "jmpl %%g2, %%o7\n\t" /* Call the function. */
530 " mov %%g3, %%o0\n\t" /* Get back the arg in delay. */
531 "mov %3, %%g1\n\t"
532 "t 0x10\n\t" /* Linux/Sparc exit(). */
533 /* Notreached by child. */
534 "1: mov %%o0, %0\n\t" :
535 "=r" (retval) :
536 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
537 "i" (__NR_exit), "r" (fn), "r" (arg) :
538 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
539 return retval;
540}
541EXPORT_SYMBOL(kernel_thread);
542
543unsigned long get_wchan(struct task_struct *task)
544{
545 unsigned long pc, fp, bias = 0;
546 unsigned long task_base = (unsigned long) task;
547 unsigned long ret = 0;
548 struct reg_window32 *rw;
549 int count = 0;
550
551 if (!task || task == current ||
552 task->state == TASK_RUNNING)
553 goto out;
554
555 fp = task_thread_info(task)->ksp + bias;
556 do {
557 /* Bogus frame pointer? */
558 if (fp < (task_base + sizeof(struct thread_info)) ||
559 fp >= (task_base + (2 * PAGE_SIZE)))
560 break;
561 rw = (struct reg_window32 *) fp;
562 pc = rw->ins[7];
563 if (!in_sched_functions(pc)) {
564 ret = pc;
565 goto out;
566 }
567 fp = rw->ins[6] + bias;
568 } while (++count < 16);
569
570out:
571 return ret;
572}
573
1// SPDX-License-Identifier: GPL-2.0
2/* linux/arch/sparc/kernel/process.c
3 *
4 * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
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#include <linux/elfcore.h>
12#include <linux/errno.h>
13#include <linux/module.h>
14#include <linux/sched.h>
15#include <linux/sched/debug.h>
16#include <linux/sched/task.h>
17#include <linux/sched/task_stack.h>
18#include <linux/kernel.h>
19#include <linux/mm.h>
20#include <linux/stddef.h>
21#include <linux/ptrace.h>
22#include <linux/user.h>
23#include <linux/smp.h>
24#include <linux/reboot.h>
25#include <linux/delay.h>
26#include <linux/pm.h>
27#include <linux/slab.h>
28#include <linux/cpu.h>
29
30#include <asm/auxio.h>
31#include <asm/oplib.h>
32#include <linux/uaccess.h>
33#include <asm/page.h>
34#include <asm/delay.h>
35#include <asm/processor.h>
36#include <asm/psr.h>
37#include <asm/elf.h>
38#include <asm/prom.h>
39#include <asm/unistd.h>
40#include <asm/setup.h>
41
42#include "kernel.h"
43
44/*
45 * Power management idle function
46 * Set in pm platform drivers (apc.c and pmc.c)
47 */
48void (*sparc_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 */
55void (*pm_power_off)(void) = machine_power_off;
56EXPORT_SYMBOL(pm_power_off);
57
58/*
59 * sysctl - toggle power-off restriction for serial console
60 * systems in machine_power_off()
61 */
62int scons_pwroff = 1;
63
64extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);
65
66struct task_struct *last_task_used_math = NULL;
67struct thread_info *current_set[NR_CPUS];
68
69/* Idle loop support. */
70void arch_cpu_idle(void)
71{
72 if (sparc_idle)
73 (*sparc_idle)();
74}
75
76/* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */
77void machine_halt(void)
78{
79 local_irq_enable();
80 mdelay(8);
81 local_irq_disable();
82 prom_halt();
83 panic("Halt failed!");
84}
85
86void machine_restart(char * cmd)
87{
88 char *p;
89
90 local_irq_enable();
91 mdelay(8);
92 local_irq_disable();
93
94 p = strchr (reboot_command, '\n');
95 if (p) *p = 0;
96 if (cmd)
97 prom_reboot(cmd);
98 if (*reboot_command)
99 prom_reboot(reboot_command);
100 prom_feval ("reset");
101 panic("Reboot failed!");
102}
103
104void machine_power_off(void)
105{
106 if (auxio_power_register &&
107 (!of_node_is_type(of_console_device, "serial") || scons_pwroff)) {
108 u8 power_register = sbus_readb(auxio_power_register);
109 power_register |= AUXIO_POWER_OFF;
110 sbus_writeb(power_register, auxio_power_register);
111 }
112
113 machine_halt();
114}
115
116void show_regs(struct pt_regs *r)
117{
118 struct reg_window32 *rw = (struct reg_window32 *) r->u_regs[14];
119
120 show_regs_print_info(KERN_DEFAULT);
121
122 printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx %s\n",
123 r->psr, r->pc, r->npc, r->y, print_tainted());
124 printk("PC: <%pS>\n", (void *) r->pc);
125 printk("%%G: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
126 r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3],
127 r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]);
128 printk("%%O: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
129 r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11],
130 r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]);
131 printk("RPC: <%pS>\n", (void *) r->u_regs[15]);
132
133 printk("%%L: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
134 rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3],
135 rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
136 printk("%%I: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
137 rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
138 rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
139}
140
141/*
142 * The show_stack() is external API which we do not use ourselves.
143 * The oops is printed in die_if_kernel.
144 */
145void show_stack(struct task_struct *tsk, unsigned long *_ksp, const char *loglvl)
146{
147 unsigned long pc, fp;
148 unsigned long task_base;
149 struct reg_window32 *rw;
150 int count = 0;
151
152 if (!tsk)
153 tsk = current;
154
155 if (tsk == current && !_ksp)
156 __asm__ __volatile__("mov %%fp, %0" : "=r" (_ksp));
157
158 task_base = (unsigned long) task_stack_page(tsk);
159 fp = (unsigned long) _ksp;
160 do {
161 /* Bogus frame pointer? */
162 if (fp < (task_base + sizeof(struct thread_info)) ||
163 fp >= (task_base + (PAGE_SIZE << 1)))
164 break;
165 rw = (struct reg_window32 *) fp;
166 pc = rw->ins[7];
167 printk("%s[%08lx : ", loglvl, pc);
168 printk("%s%pS ] ", loglvl, (void *) pc);
169 fp = rw->ins[6];
170 } while (++count < 16);
171 printk("%s\n", loglvl);
172}
173
174/*
175 * Free current thread data structures etc..
176 */
177void exit_thread(struct task_struct *tsk)
178{
179#ifndef CONFIG_SMP
180 if (last_task_used_math == tsk) {
181#else
182 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {
183#endif
184 /* Keep process from leaving FPU in a bogon state. */
185 put_psr(get_psr() | PSR_EF);
186 fpsave(&tsk->thread.float_regs[0], &tsk->thread.fsr,
187 &tsk->thread.fpqueue[0], &tsk->thread.fpqdepth);
188#ifndef CONFIG_SMP
189 last_task_used_math = NULL;
190#else
191 clear_ti_thread_flag(task_thread_info(tsk), TIF_USEDFPU);
192#endif
193 }
194}
195
196void flush_thread(void)
197{
198 current_thread_info()->w_saved = 0;
199
200#ifndef CONFIG_SMP
201 if(last_task_used_math == current) {
202#else
203 if (test_thread_flag(TIF_USEDFPU)) {
204#endif
205 /* Clean the fpu. */
206 put_psr(get_psr() | PSR_EF);
207 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
208 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
209#ifndef CONFIG_SMP
210 last_task_used_math = NULL;
211#else
212 clear_thread_flag(TIF_USEDFPU);
213#endif
214 }
215}
216
217static inline struct sparc_stackf __user *
218clone_stackframe(struct sparc_stackf __user *dst,
219 struct sparc_stackf __user *src)
220{
221 unsigned long size, fp;
222 struct sparc_stackf *tmp;
223 struct sparc_stackf __user *sp;
224
225 if (get_user(tmp, &src->fp))
226 return NULL;
227
228 fp = (unsigned long) tmp;
229 size = (fp - ((unsigned long) src));
230 fp = (unsigned long) dst;
231 sp = (struct sparc_stackf __user *)(fp - size);
232
233 /* do_fork() grabs the parent semaphore, we must release it
234 * temporarily so we can build the child clone stack frame
235 * without deadlocking.
236 */
237 if (__copy_user(sp, src, size))
238 sp = NULL;
239 else if (put_user(fp, &sp->fp))
240 sp = NULL;
241
242 return sp;
243}
244
245/* Copy a Sparc thread. The fork() return value conventions
246 * under SunOS are nothing short of bletcherous:
247 * Parent --> %o0 == childs pid, %o1 == 0
248 * Child --> %o0 == parents pid, %o1 == 1
249 *
250 * NOTE: We have a separate fork kpsr/kwim because
251 * the parent could change these values between
252 * sys_fork invocation and when we reach here
253 * if the parent should sleep while trying to
254 * allocate the task_struct and kernel stack in
255 * do_fork().
256 * XXX See comment above sys_vfork in sparc64. todo.
257 */
258extern void ret_from_fork(void);
259extern void ret_from_kernel_thread(void);
260
261int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
262{
263 unsigned long clone_flags = args->flags;
264 unsigned long sp = args->stack;
265 unsigned long tls = args->tls;
266 struct thread_info *ti = task_thread_info(p);
267 struct pt_regs *childregs, *regs = current_pt_regs();
268 char *new_stack;
269
270#ifndef CONFIG_SMP
271 if(last_task_used_math == current) {
272#else
273 if (test_thread_flag(TIF_USEDFPU)) {
274#endif
275 put_psr(get_psr() | PSR_EF);
276 fpsave(&p->thread.float_regs[0], &p->thread.fsr,
277 &p->thread.fpqueue[0], &p->thread.fpqdepth);
278 }
279
280 /*
281 * p->thread_info new_stack childregs stack bottom
282 * ! ! ! !
283 * V V (stk.fr.) V (pt_regs) V
284 * +----- - - - - - ------+===========+=============+
285 */
286 new_stack = task_stack_page(p) + THREAD_SIZE;
287 new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
288 childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ);
289
290 /*
291 * A new process must start with interrupts disabled, see schedule_tail()
292 * and finish_task_switch(). (If we do not do it and if a timer interrupt
293 * hits before we unlock and attempts to take the rq->lock, we deadlock.)
294 *
295 * Thus, kpsr |= PSR_PIL.
296 */
297 ti->ksp = (unsigned long) new_stack;
298 p->thread.kregs = childregs;
299
300 if (unlikely(args->fn)) {
301 extern int nwindows;
302 unsigned long psr;
303 memset(new_stack, 0, STACKFRAME_SZ + TRACEREG_SZ);
304 ti->kpc = (((unsigned long) ret_from_kernel_thread) - 0x8);
305 childregs->u_regs[UREG_G1] = (unsigned long) args->fn;
306 childregs->u_regs[UREG_G2] = (unsigned long) args->fn_arg;
307 psr = childregs->psr = get_psr();
308 ti->kpsr = psr | PSR_PIL;
309 ti->kwim = 1 << (((psr & PSR_CWP) + 1) % nwindows);
310 return 0;
311 }
312 memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
313 childregs->u_regs[UREG_FP] = sp;
314 ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
315 ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
316 ti->kwim = current->thread.fork_kwim;
317
318 if (sp != regs->u_regs[UREG_FP]) {
319 struct sparc_stackf __user *childstack;
320 struct sparc_stackf __user *parentstack;
321
322 /*
323 * This is a clone() call with supplied user stack.
324 * Set some valid stack frames to give to the child.
325 */
326 childstack = (struct sparc_stackf __user *)
327 (sp & ~0xfUL);
328 parentstack = (struct sparc_stackf __user *)
329 regs->u_regs[UREG_FP];
330
331#if 0
332 printk("clone: parent stack:\n");
333 show_stackframe(parentstack);
334#endif
335
336 childstack = clone_stackframe(childstack, parentstack);
337 if (!childstack)
338 return -EFAULT;
339
340#if 0
341 printk("clone: child stack:\n");
342 show_stackframe(childstack);
343#endif
344
345 childregs->u_regs[UREG_FP] = (unsigned long)childstack;
346 }
347
348#ifdef CONFIG_SMP
349 /* FPU must be disabled on SMP. */
350 childregs->psr &= ~PSR_EF;
351 clear_tsk_thread_flag(p, TIF_USEDFPU);
352#endif
353
354 /* Set the return value for the child. */
355 childregs->u_regs[UREG_I0] = current->pid;
356 childregs->u_regs[UREG_I1] = 1;
357
358 /* Set the return value for the parent. */
359 regs->u_regs[UREG_I1] = 0;
360
361 if (clone_flags & CLONE_SETTLS)
362 childregs->u_regs[UREG_G7] = tls;
363
364 return 0;
365}
366
367unsigned long __get_wchan(struct task_struct *task)
368{
369 unsigned long pc, fp, bias = 0;
370 unsigned long task_base = (unsigned long) task;
371 unsigned long ret = 0;
372 struct reg_window32 *rw;
373 int count = 0;
374
375 fp = task_thread_info(task)->ksp + bias;
376 do {
377 /* Bogus frame pointer? */
378 if (fp < (task_base + sizeof(struct thread_info)) ||
379 fp >= (task_base + (2 * PAGE_SIZE)))
380 break;
381 rw = (struct reg_window32 *) fp;
382 pc = rw->ins[7];
383 if (!in_sched_functions(pc)) {
384 ret = pc;
385 goto out;
386 }
387 fp = rw->ins[6] + bias;
388 } while (++count < 16);
389
390out:
391 return ret;
392}
393