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1 | /* arch/sparc64/kernel/process.c |
2 | * |
3 | * Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net) |
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 | |
14 | #include <linux/errno.h> |
15 | #include <linux/module.h> |
16 | #include <linux/sched.h> |
17 | #include <linux/kernel.h> |
18 | #include <linux/mm.h> |
19 | #include <linux/fs.h> |
20 | #include <linux/smp.h> |
21 | #include <linux/stddef.h> |
22 | #include <linux/ptrace.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/user.h> |
25 | #include <linux/delay.h> |
26 | #include <linux/compat.h> |
27 | #include <linux/tick.h> |
28 | #include <linux/init.h> |
29 | #include <linux/cpu.h> |
30 | #include <linux/elfcore.h> |
31 | #include <linux/sysrq.h> |
32 | #include <linux/nmi.h> |
33 | |
34 | #include <asm/uaccess.h> |
35 | #include <asm/system.h> |
36 | #include <asm/page.h> |
37 | #include <asm/pgalloc.h> |
38 | #include <asm/pgtable.h> |
39 | #include <asm/processor.h> |
40 | #include <asm/pstate.h> |
41 | #include <asm/elf.h> |
42 | #include <asm/fpumacro.h> |
43 | #include <asm/head.h> |
44 | #include <asm/cpudata.h> |
45 | #include <asm/mmu_context.h> |
46 | #include <asm/unistd.h> |
47 | #include <asm/hypervisor.h> |
48 | #include <asm/syscalls.h> |
49 | #include <asm/irq_regs.h> |
50 | #include <asm/smp.h> |
51 | |
52 | #include "kstack.h" |
53 | |
54 | static void sparc64_yield(int cpu) |
55 | { |
56 | if (tlb_type != hypervisor) { |
57 | touch_nmi_watchdog(); |
58 | return; |
59 | } |
60 | |
61 | clear_thread_flag(TIF_POLLING_NRFLAG); |
62 | smp_mb__after_clear_bit(); |
63 | |
64 | while (!need_resched() && !cpu_is_offline(cpu)) { |
65 | unsigned long pstate; |
66 | |
67 | /* Disable interrupts. */ |
68 | __asm__ __volatile__( |
69 | "rdpr %%pstate, %0\n\t" |
70 | "andn %0, %1, %0\n\t" |
71 | "wrpr %0, %%g0, %%pstate" |
72 | : "=&r" (pstate) |
73 | : "i" (PSTATE_IE)); |
74 | |
75 | if (!need_resched() && !cpu_is_offline(cpu)) |
76 | sun4v_cpu_yield(); |
77 | |
78 | /* Re-enable interrupts. */ |
79 | __asm__ __volatile__( |
80 | "rdpr %%pstate, %0\n\t" |
81 | "or %0, %1, %0\n\t" |
82 | "wrpr %0, %%g0, %%pstate" |
83 | : "=&r" (pstate) |
84 | : "i" (PSTATE_IE)); |
85 | } |
86 | |
87 | set_thread_flag(TIF_POLLING_NRFLAG); |
88 | } |
89 | |
90 | /* The idle loop on sparc64. */ |
91 | void cpu_idle(void) |
92 | { |
93 | int cpu = smp_processor_id(); |
94 | |
95 | set_thread_flag(TIF_POLLING_NRFLAG); |
96 | |
97 | while(1) { |
98 | tick_nohz_stop_sched_tick(1); |
99 | |
100 | while (!need_resched() && !cpu_is_offline(cpu)) |
101 | sparc64_yield(cpu); |
102 | |
103 | tick_nohz_restart_sched_tick(); |
104 | |
105 | preempt_enable_no_resched(); |
106 | |
107 | #ifdef CONFIG_HOTPLUG_CPU |
108 | if (cpu_is_offline(cpu)) |
109 | cpu_play_dead(); |
110 | #endif |
111 | |
112 | schedule(); |
113 | preempt_disable(); |
114 | } |
115 | } |
116 | |
117 | #ifdef CONFIG_COMPAT |
118 | static void show_regwindow32(struct pt_regs *regs) |
119 | { |
120 | struct reg_window32 __user *rw; |
121 | struct reg_window32 r_w; |
122 | mm_segment_t old_fs; |
123 | |
124 | __asm__ __volatile__ ("flushw"); |
125 | rw = compat_ptr((unsigned)regs->u_regs[14]); |
126 | old_fs = get_fs(); |
127 | set_fs (USER_DS); |
128 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { |
129 | set_fs (old_fs); |
130 | return; |
131 | } |
132 | |
133 | set_fs (old_fs); |
134 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " |
135 | "l4: %08x l5: %08x l6: %08x l7: %08x\n", |
136 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], |
137 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); |
138 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " |
139 | "i4: %08x i5: %08x i6: %08x i7: %08x\n", |
140 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], |
141 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); |
142 | } |
143 | #else |
144 | #define show_regwindow32(regs) do { } while (0) |
145 | #endif |
146 | |
147 | static void show_regwindow(struct pt_regs *regs) |
148 | { |
149 | struct reg_window __user *rw; |
150 | struct reg_window *rwk; |
151 | struct reg_window r_w; |
152 | mm_segment_t old_fs; |
153 | |
154 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { |
155 | __asm__ __volatile__ ("flushw"); |
156 | rw = (struct reg_window __user *) |
157 | (regs->u_regs[14] + STACK_BIAS); |
158 | rwk = (struct reg_window *) |
159 | (regs->u_regs[14] + STACK_BIAS); |
160 | if (!(regs->tstate & TSTATE_PRIV)) { |
161 | old_fs = get_fs(); |
162 | set_fs (USER_DS); |
163 | if (copy_from_user (&r_w, rw, sizeof(r_w))) { |
164 | set_fs (old_fs); |
165 | return; |
166 | } |
167 | rwk = &r_w; |
168 | set_fs (old_fs); |
169 | } |
170 | } else { |
171 | show_regwindow32(regs); |
172 | return; |
173 | } |
174 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", |
175 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); |
176 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", |
177 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); |
178 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", |
179 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); |
180 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", |
181 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); |
182 | if (regs->tstate & TSTATE_PRIV) |
183 | printk("I7: <%pS>\n", (void *) rwk->ins[7]); |
184 | } |
185 | |
186 | void show_regs(struct pt_regs *regs) |
187 | { |
188 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, |
189 | regs->tpc, regs->tnpc, regs->y, print_tainted()); |
190 | printk("TPC: <%pS>\n", (void *) regs->tpc); |
191 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", |
192 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], |
193 | regs->u_regs[3]); |
194 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", |
195 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], |
196 | regs->u_regs[7]); |
197 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", |
198 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], |
199 | regs->u_regs[11]); |
200 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", |
201 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], |
202 | regs->u_regs[15]); |
203 | printk("RPC: <%pS>\n", (void *) regs->u_regs[15]); |
204 | show_regwindow(regs); |
205 | show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]); |
206 | } |
207 | |
208 | struct global_reg_snapshot global_reg_snapshot[NR_CPUS]; |
209 | static DEFINE_SPINLOCK(global_reg_snapshot_lock); |
210 | |
211 | static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, |
212 | int this_cpu) |
213 | { |
214 | flushw_all(); |
215 | |
216 | global_reg_snapshot[this_cpu].tstate = regs->tstate; |
217 | global_reg_snapshot[this_cpu].tpc = regs->tpc; |
218 | global_reg_snapshot[this_cpu].tnpc = regs->tnpc; |
219 | global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7]; |
220 | |
221 | if (regs->tstate & TSTATE_PRIV) { |
222 | struct reg_window *rw; |
223 | |
224 | rw = (struct reg_window *) |
225 | (regs->u_regs[UREG_FP] + STACK_BIAS); |
226 | if (kstack_valid(tp, (unsigned long) rw)) { |
227 | global_reg_snapshot[this_cpu].i7 = rw->ins[7]; |
228 | rw = (struct reg_window *) |
229 | (rw->ins[6] + STACK_BIAS); |
230 | if (kstack_valid(tp, (unsigned long) rw)) |
231 | global_reg_snapshot[this_cpu].rpc = rw->ins[7]; |
232 | } |
233 | } else { |
234 | global_reg_snapshot[this_cpu].i7 = 0; |
235 | global_reg_snapshot[this_cpu].rpc = 0; |
236 | } |
237 | global_reg_snapshot[this_cpu].thread = tp; |
238 | } |
239 | |
240 | /* In order to avoid hangs we do not try to synchronize with the |
241 | * global register dump client cpus. The last store they make is to |
242 | * the thread pointer, so do a short poll waiting for that to become |
243 | * non-NULL. |
244 | */ |
245 | static void __global_reg_poll(struct global_reg_snapshot *gp) |
246 | { |
247 | int limit = 0; |
248 | |
249 | while (!gp->thread && ++limit < 100) { |
250 | barrier(); |
251 | udelay(1); |
252 | } |
253 | } |
254 | |
255 | void arch_trigger_all_cpu_backtrace(void) |
256 | { |
257 | struct thread_info *tp = current_thread_info(); |
258 | struct pt_regs *regs = get_irq_regs(); |
259 | unsigned long flags; |
260 | int this_cpu, cpu; |
261 | |
262 | if (!regs) |
263 | regs = tp->kregs; |
264 | |
265 | spin_lock_irqsave(&global_reg_snapshot_lock, flags); |
266 | |
267 | memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); |
268 | |
269 | this_cpu = raw_smp_processor_id(); |
270 | |
271 | __global_reg_self(tp, regs, this_cpu); |
272 | |
273 | smp_fetch_global_regs(); |
274 | |
275 | for_each_online_cpu(cpu) { |
276 | struct global_reg_snapshot *gp = &global_reg_snapshot[cpu]; |
277 | |
278 | __global_reg_poll(gp); |
279 | |
280 | tp = gp->thread; |
281 | printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n", |
282 | (cpu == this_cpu ? '*' : ' '), cpu, |
283 | gp->tstate, gp->tpc, gp->tnpc, |
284 | ((tp && tp->task) ? tp->task->comm : "NULL"), |
285 | ((tp && tp->task) ? tp->task->pid : -1)); |
286 | |
287 | if (gp->tstate & TSTATE_PRIV) { |
288 | printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n", |
289 | (void *) gp->tpc, |
290 | (void *) gp->o7, |
291 | (void *) gp->i7, |
292 | (void *) gp->rpc); |
293 | } else { |
294 | printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n", |
295 | gp->tpc, gp->o7, gp->i7, gp->rpc); |
296 | } |
297 | } |
298 | |
299 | memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); |
300 | |
301 | spin_unlock_irqrestore(&global_reg_snapshot_lock, flags); |
302 | } |
303 | |
304 | #ifdef CONFIG_MAGIC_SYSRQ |
305 | |
306 | static void sysrq_handle_globreg(int key) |
307 | { |
308 | arch_trigger_all_cpu_backtrace(); |
309 | } |
310 | |
311 | static struct sysrq_key_op sparc_globalreg_op = { |
312 | .handler = sysrq_handle_globreg, |
313 | .help_msg = "Globalregs", |
314 | .action_msg = "Show Global CPU Regs", |
315 | }; |
316 | |
317 | static int __init sparc_globreg_init(void) |
318 | { |
319 | return register_sysrq_key('y', &sparc_globalreg_op); |
320 | } |
321 | |
322 | core_initcall(sparc_globreg_init); |
323 | |
324 | #endif |
325 | |
326 | unsigned long thread_saved_pc(struct task_struct *tsk) |
327 | { |
328 | struct thread_info *ti = task_thread_info(tsk); |
329 | unsigned long ret = 0xdeadbeefUL; |
330 | |
331 | if (ti && ti->ksp) { |
332 | unsigned long *sp; |
333 | sp = (unsigned long *)(ti->ksp + STACK_BIAS); |
334 | if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL && |
335 | sp[14]) { |
336 | unsigned long *fp; |
337 | fp = (unsigned long *)(sp[14] + STACK_BIAS); |
338 | if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL) |
339 | ret = fp[15]; |
340 | } |
341 | } |
342 | return ret; |
343 | } |
344 | |
345 | /* Free current thread data structures etc.. */ |
346 | void exit_thread(void) |
347 | { |
348 | struct thread_info *t = current_thread_info(); |
349 | |
350 | if (t->utraps) { |
351 | if (t->utraps[0] < 2) |
352 | kfree (t->utraps); |
353 | else |
354 | t->utraps[0]--; |
355 | } |
356 | } |
357 | |
358 | void flush_thread(void) |
359 | { |
360 | struct thread_info *t = current_thread_info(); |
361 | struct mm_struct *mm; |
362 | |
363 | mm = t->task->mm; |
364 | if (mm) |
365 | tsb_context_switch(mm); |
366 | |
367 | set_thread_wsaved(0); |
368 | |
369 | /* Clear FPU register state. */ |
370 | t->fpsaved[0] = 0; |
371 | |
372 | if (get_thread_current_ds() != ASI_AIUS) |
373 | set_fs(USER_DS); |
374 | } |
375 | |
376 | /* It's a bit more tricky when 64-bit tasks are involved... */ |
377 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) |
378 | { |
379 | unsigned long fp, distance, rval; |
380 | |
381 | if (!(test_thread_flag(TIF_32BIT))) { |
382 | csp += STACK_BIAS; |
383 | psp += STACK_BIAS; |
384 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); |
385 | fp += STACK_BIAS; |
386 | } else |
387 | __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); |
388 | |
389 | /* Now align the stack as this is mandatory in the Sparc ABI |
390 | * due to how register windows work. This hides the |
391 | * restriction from thread libraries etc. |
392 | */ |
393 | csp &= ~15UL; |
394 | |
395 | distance = fp - psp; |
396 | rval = (csp - distance); |
397 | if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) |
398 | rval = 0; |
399 | else if (test_thread_flag(TIF_32BIT)) { |
400 | if (put_user(((u32)csp), |
401 | &(((struct reg_window32 __user *)rval)->ins[6]))) |
402 | rval = 0; |
403 | } else { |
404 | if (put_user(((u64)csp - STACK_BIAS), |
405 | &(((struct reg_window __user *)rval)->ins[6]))) |
406 | rval = 0; |
407 | else |
408 | rval = rval - STACK_BIAS; |
409 | } |
410 | |
411 | return rval; |
412 | } |
413 | |
414 | /* Standard stuff. */ |
415 | static inline void shift_window_buffer(int first_win, int last_win, |
416 | struct thread_info *t) |
417 | { |
418 | int i; |
419 | |
420 | for (i = first_win; i < last_win; i++) { |
421 | t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; |
422 | memcpy(&t->reg_window[i], &t->reg_window[i+1], |
423 | sizeof(struct reg_window)); |
424 | } |
425 | } |
426 | |
427 | void synchronize_user_stack(void) |
428 | { |
429 | struct thread_info *t = current_thread_info(); |
430 | unsigned long window; |
431 | |
432 | flush_user_windows(); |
433 | if ((window = get_thread_wsaved()) != 0) { |
434 | int winsize = sizeof(struct reg_window); |
435 | int bias = 0; |
436 | |
437 | if (test_thread_flag(TIF_32BIT)) |
438 | winsize = sizeof(struct reg_window32); |
439 | else |
440 | bias = STACK_BIAS; |
441 | |
442 | window -= 1; |
443 | do { |
444 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); |
445 | struct reg_window *rwin = &t->reg_window[window]; |
446 | |
447 | if (!copy_to_user((char __user *)sp, rwin, winsize)) { |
448 | shift_window_buffer(window, get_thread_wsaved() - 1, t); |
449 | set_thread_wsaved(get_thread_wsaved() - 1); |
450 | } |
451 | } while (window--); |
452 | } |
453 | } |
454 | |
455 | static void stack_unaligned(unsigned long sp) |
456 | { |
457 | siginfo_t info; |
458 | |
459 | info.si_signo = SIGBUS; |
460 | info.si_errno = 0; |
461 | info.si_code = BUS_ADRALN; |
462 | info.si_addr = (void __user *) sp; |
463 | info.si_trapno = 0; |
464 | force_sig_info(SIGBUS, &info, current); |
465 | } |
466 | |
467 | void fault_in_user_windows(void) |
468 | { |
469 | struct thread_info *t = current_thread_info(); |
470 | unsigned long window; |
471 | int winsize = sizeof(struct reg_window); |
472 | int bias = 0; |
473 | |
474 | if (test_thread_flag(TIF_32BIT)) |
475 | winsize = sizeof(struct reg_window32); |
476 | else |
477 | bias = STACK_BIAS; |
478 | |
479 | flush_user_windows(); |
480 | window = get_thread_wsaved(); |
481 | |
482 | if (likely(window != 0)) { |
483 | window -= 1; |
484 | do { |
485 | unsigned long sp = (t->rwbuf_stkptrs[window] + bias); |
486 | struct reg_window *rwin = &t->reg_window[window]; |
487 | |
488 | if (unlikely(sp & 0x7UL)) |
489 | stack_unaligned(sp); |
490 | |
491 | if (unlikely(copy_to_user((char __user *)sp, |
492 | rwin, winsize))) |
493 | goto barf; |
494 | } while (window--); |
495 | } |
496 | set_thread_wsaved(0); |
497 | return; |
498 | |
499 | barf: |
500 | set_thread_wsaved(window + 1); |
501 | do_exit(SIGILL); |
502 | } |
503 | |
504 | asmlinkage long sparc_do_fork(unsigned long clone_flags, |
505 | unsigned long stack_start, |
506 | struct pt_regs *regs, |
507 | unsigned long stack_size) |
508 | { |
509 | int __user *parent_tid_ptr, *child_tid_ptr; |
510 | unsigned long orig_i1 = regs->u_regs[UREG_I1]; |
511 | long ret; |
512 | |
513 | #ifdef CONFIG_COMPAT |
514 | if (test_thread_flag(TIF_32BIT)) { |
515 | parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); |
516 | child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); |
517 | } else |
518 | #endif |
519 | { |
520 | parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; |
521 | child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; |
522 | } |
523 | |
524 | ret = do_fork(clone_flags, stack_start, |
525 | regs, stack_size, |
526 | parent_tid_ptr, child_tid_ptr); |
527 | |
528 | /* If we get an error and potentially restart the system |
529 | * call, we're screwed because copy_thread() clobbered |
530 | * the parent's %o1. So detect that case and restore it |
531 | * here. |
532 | */ |
533 | if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) |
534 | regs->u_regs[UREG_I1] = orig_i1; |
535 | |
536 | return ret; |
537 | } |
538 | |
539 | /* Copy a Sparc thread. The fork() return value conventions |
540 | * under SunOS are nothing short of bletcherous: |
541 | * Parent --> %o0 == childs pid, %o1 == 0 |
542 | * Child --> %o0 == parents pid, %o1 == 1 |
543 | */ |
544 | int copy_thread(unsigned long clone_flags, unsigned long sp, |
545 | unsigned long unused, |
546 | struct task_struct *p, struct pt_regs *regs) |
547 | { |
548 | struct thread_info *t = task_thread_info(p); |
549 | struct sparc_stackf *parent_sf; |
550 | unsigned long child_stack_sz; |
551 | char *child_trap_frame; |
552 | int kernel_thread; |
553 | |
554 | kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0; |
555 | parent_sf = ((struct sparc_stackf *) regs) - 1; |
556 | |
557 | /* Calculate offset to stack_frame & pt_regs */ |
558 | child_stack_sz = ((STACKFRAME_SZ + TRACEREG_SZ) + |
559 | (kernel_thread ? STACKFRAME_SZ : 0)); |
560 | child_trap_frame = (task_stack_page(p) + |
561 | (THREAD_SIZE - child_stack_sz)); |
562 | memcpy(child_trap_frame, parent_sf, child_stack_sz); |
563 | |
564 | t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | |
565 | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) | |
566 | (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT); |
567 | t->new_child = 1; |
568 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
569 | t->kregs = (struct pt_regs *) (child_trap_frame + |
570 | sizeof(struct sparc_stackf)); |
571 | t->fpsaved[0] = 0; |
572 | |
573 | if (kernel_thread) { |
574 | struct sparc_stackf *child_sf = (struct sparc_stackf *) |
575 | (child_trap_frame + (STACKFRAME_SZ + TRACEREG_SZ)); |
576 | |
577 | /* Zero terminate the stack backtrace. */ |
578 | child_sf->fp = NULL; |
579 | t->kregs->u_regs[UREG_FP] = |
580 | ((unsigned long) child_sf) - STACK_BIAS; |
581 | |
582 | t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT); |
583 | t->kregs->u_regs[UREG_G6] = (unsigned long) t; |
584 | t->kregs->u_regs[UREG_G4] = (unsigned long) t->task; |
585 | } else { |
586 | if (t->flags & _TIF_32BIT) { |
587 | sp &= 0x00000000ffffffffUL; |
588 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; |
589 | } |
590 | t->kregs->u_regs[UREG_FP] = sp; |
591 | t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT); |
592 | if (sp != regs->u_regs[UREG_FP]) { |
593 | unsigned long csp; |
594 | |
595 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); |
596 | if (!csp) |
597 | return -EFAULT; |
598 | t->kregs->u_regs[UREG_FP] = csp; |
599 | } |
600 | if (t->utraps) |
601 | t->utraps[0]++; |
602 | } |
603 | |
604 | /* Set the return value for the child. */ |
605 | t->kregs->u_regs[UREG_I0] = current->pid; |
606 | t->kregs->u_regs[UREG_I1] = 1; |
607 | |
608 | /* Set the second return value for the parent. */ |
609 | regs->u_regs[UREG_I1] = 0; |
610 | |
611 | if (clone_flags & CLONE_SETTLS) |
612 | t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; |
613 | |
614 | return 0; |
615 | } |
616 | |
617 | /* |
618 | * This is the mechanism for creating a new kernel thread. |
619 | * |
620 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants |
621 | * who haven't done an "execve()") should use this: it will work within |
622 | * a system call from a "real" process, but the process memory space will |
623 | * not be freed until both the parent and the child have exited. |
624 | */ |
625 | pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
626 | { |
627 | long retval; |
628 | |
629 | /* If the parent runs before fn(arg) is called by the child, |
630 | * the input registers of this function can be clobbered. |
631 | * So we stash 'fn' and 'arg' into global registers which |
632 | * will not be modified by the parent. |
633 | */ |
634 | __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */ |
635 | "mov %5, %%g3\n\t" /* Save ARG into global */ |
636 | "mov %1, %%g1\n\t" /* Clone syscall nr. */ |
637 | "mov %2, %%o0\n\t" /* Clone flags. */ |
638 | "mov 0, %%o1\n\t" /* usp arg == 0 */ |
639 | "t 0x6d\n\t" /* Linux/Sparc clone(). */ |
640 | "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */ |
641 | " mov %%o0, %0\n\t" |
642 | "jmpl %%g2, %%o7\n\t" /* Call the function. */ |
643 | " mov %%g3, %%o0\n\t" /* Set arg in delay. */ |
644 | "mov %3, %%g1\n\t" |
645 | "t 0x6d\n\t" /* Linux/Sparc exit(). */ |
646 | /* Notreached by child. */ |
647 | "1:" : |
648 | "=r" (retval) : |
649 | "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), |
650 | "i" (__NR_exit), "r" (fn), "r" (arg) : |
651 | "g1", "g2", "g3", "o0", "o1", "memory", "cc"); |
652 | return retval; |
653 | } |
654 | EXPORT_SYMBOL(kernel_thread); |
655 | |
656 | typedef struct { |
657 | union { |
658 | unsigned int pr_regs[32]; |
659 | unsigned long pr_dregs[16]; |
660 | } pr_fr; |
661 | unsigned int __unused; |
662 | unsigned int pr_fsr; |
663 | unsigned char pr_qcnt; |
664 | unsigned char pr_q_entrysize; |
665 | unsigned char pr_en; |
666 | unsigned int pr_q[64]; |
667 | } elf_fpregset_t32; |
668 | |
669 | /* |
670 | * fill in the fpu structure for a core dump. |
671 | */ |
672 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) |
673 | { |
674 | unsigned long *kfpregs = current_thread_info()->fpregs; |
675 | unsigned long fprs = current_thread_info()->fpsaved[0]; |
676 | |
677 | if (test_thread_flag(TIF_32BIT)) { |
678 | elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; |
679 | |
680 | if (fprs & FPRS_DL) |
681 | memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, |
682 | sizeof(unsigned int) * 32); |
683 | else |
684 | memset(&fpregs32->pr_fr.pr_regs[0], 0, |
685 | sizeof(unsigned int) * 32); |
686 | fpregs32->pr_qcnt = 0; |
687 | fpregs32->pr_q_entrysize = 8; |
688 | memset(&fpregs32->pr_q[0], 0, |
689 | (sizeof(unsigned int) * 64)); |
690 | if (fprs & FPRS_FEF) { |
691 | fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; |
692 | fpregs32->pr_en = 1; |
693 | } else { |
694 | fpregs32->pr_fsr = 0; |
695 | fpregs32->pr_en = 0; |
696 | } |
697 | } else { |
698 | if(fprs & FPRS_DL) |
699 | memcpy(&fpregs->pr_regs[0], kfpregs, |
700 | sizeof(unsigned int) * 32); |
701 | else |
702 | memset(&fpregs->pr_regs[0], 0, |
703 | sizeof(unsigned int) * 32); |
704 | if(fprs & FPRS_DU) |
705 | memcpy(&fpregs->pr_regs[16], kfpregs+16, |
706 | sizeof(unsigned int) * 32); |
707 | else |
708 | memset(&fpregs->pr_regs[16], 0, |
709 | sizeof(unsigned int) * 32); |
710 | if(fprs & FPRS_FEF) { |
711 | fpregs->pr_fsr = current_thread_info()->xfsr[0]; |
712 | fpregs->pr_gsr = current_thread_info()->gsr[0]; |
713 | } else { |
714 | fpregs->pr_fsr = fpregs->pr_gsr = 0; |
715 | } |
716 | fpregs->pr_fprs = fprs; |
717 | } |
718 | return 1; |
719 | } |
720 | EXPORT_SYMBOL(dump_fpu); |
721 | |
722 | /* |
723 | * sparc_execve() executes a new program after the asm stub has set |
724 | * things up for us. This should basically do what I want it to. |
725 | */ |
726 | asmlinkage int sparc_execve(struct pt_regs *regs) |
727 | { |
728 | int error, base = 0; |
729 | char *filename; |
730 | |
731 | /* User register window flush is done by entry.S */ |
732 | |
733 | /* Check for indirect call. */ |
734 | if (regs->u_regs[UREG_G1] == 0) |
735 | base = 1; |
736 | |
737 | filename = getname((char __user *)regs->u_regs[base + UREG_I0]); |
738 | error = PTR_ERR(filename); |
739 | if (IS_ERR(filename)) |
740 | goto out; |
741 | error = do_execve(filename, |
742 | (const char __user *const __user *) |
743 | regs->u_regs[base + UREG_I1], |
744 | (const char __user *const __user *) |
745 | regs->u_regs[base + UREG_I2], regs); |
746 | putname(filename); |
747 | if (!error) { |
748 | fprs_write(0); |
749 | current_thread_info()->xfsr[0] = 0; |
750 | current_thread_info()->fpsaved[0] = 0; |
751 | regs->tstate &= ~TSTATE_PEF; |
752 | } |
753 | out: |
754 | return error; |
755 | } |
756 | |
757 | unsigned long get_wchan(struct task_struct *task) |
758 | { |
759 | unsigned long pc, fp, bias = 0; |
760 | struct thread_info *tp; |
761 | struct reg_window *rw; |
762 | unsigned long ret = 0; |
763 | int count = 0; |
764 | |
765 | if (!task || task == current || |
766 | task->state == TASK_RUNNING) |
767 | goto out; |
768 | |
769 | tp = task_thread_info(task); |
770 | bias = STACK_BIAS; |
771 | fp = task_thread_info(task)->ksp + bias; |
772 | |
773 | do { |
774 | if (!kstack_valid(tp, fp)) |
775 | break; |
776 | rw = (struct reg_window *) fp; |
777 | pc = rw->ins[7]; |
778 | if (!in_sched_functions(pc)) { |
779 | ret = pc; |
780 | goto out; |
781 | } |
782 | fp = rw->ins[6] + bias; |
783 | } while (++count < 16); |
784 | |
785 | out: |
786 | return ret; |
787 | } |
788 |
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