1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* arch/sparc64/kernel/process.c |
3 | * |
4 | * Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net) |
5 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) |
6 | * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
7 | */ |
8 | |
9 | /* |
10 | * This file handles the architecture-dependent parts of process handling.. |
11 | */ |
12 | #include <linux/errno.h> |
13 | #include <linux/export.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/fs.h> |
21 | #include <linux/smp.h> |
22 | #include <linux/stddef.h> |
23 | #include <linux/ptrace.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/user.h> |
26 | #include <linux/delay.h> |
27 | #include <linux/compat.h> |
28 | #include <linux/tick.h> |
29 | #include <linux/init.h> |
30 | #include <linux/cpu.h> |
31 | #include <linux/perf_event.h> |
32 | #include <linux/elfcore.h> |
33 | #include <linux/sysrq.h> |
34 | #include <linux/nmi.h> |
35 | #include <linux/context_tracking.h> |
36 | #include <linux/signal.h> |
37 | |
38 | #include <linux/uaccess.h> |
39 | #include <asm/page.h> |
40 | #include <asm/pgalloc.h> |
41 | #include <asm/processor.h> |
42 | #include <asm/pstate.h> |
43 | #include <asm/elf.h> |
44 | #include <asm/fpumacro.h> |
45 | #include <asm/head.h> |
46 | #include <asm/cpudata.h> |
47 | #include <asm/mmu_context.h> |
48 | #include <asm/unistd.h> |
49 | #include <asm/hypervisor.h> |
50 | #include <asm/syscalls.h> |
51 | #include <asm/irq_regs.h> |
52 | #include <asm/smp.h> |
53 | #include <asm/pcr.h> |
54 | |
55 | #include "kstack.h" |
56 | |
57 | /* Idle loop support on sparc64. */ |
58 | void arch_cpu_idle(void) |
59 | { |
60 | if (tlb_type != hypervisor) { |
61 | touch_nmi_watchdog(); |
62 | } else { |
63 | unsigned long pstate; |
64 | |
65 | raw_local_irq_enable(); |
66 | |
67 | /* The sun4v sleeping code requires that we have PSTATE.IE cleared over |
68 | * the cpu sleep hypervisor call. |
69 | */ |
70 | __asm__ __volatile__( |
71 | "rdpr %%pstate, %0\n\t" |
72 | "andn %0, %1, %0\n\t" |
73 | "wrpr %0, %%g0, %%pstate" |
74 | : "=&r" (pstate) |
75 | : "i" (PSTATE_IE)); |
76 | |
77 | if (!need_resched() && !cpu_is_offline(smp_processor_id())) { |
78 | sun4v_cpu_yield(); |
79 | /* If resumed by cpu_poke then we need to explicitly |
80 | * call scheduler_ipi(). |
81 | */ |
82 | scheduler_poke(); |
83 | } |
84 | |
85 | /* Re-enable interrupts. */ |
86 | __asm__ __volatile__( |
87 | "rdpr %%pstate, %0\n\t" |
88 | "or %0, %1, %0\n\t" |
89 | "wrpr %0, %%g0, %%pstate" |
90 | : "=&r" (pstate) |
91 | : "i" (PSTATE_IE)); |
92 | |
93 | raw_local_irq_disable(); |
94 | } |
95 | } |
96 | |
97 | #ifdef CONFIG_HOTPLUG_CPU |
98 | void __noreturn arch_cpu_idle_dead(void) |
99 | { |
100 | sched_preempt_enable_no_resched(); |
101 | cpu_play_dead(); |
102 | } |
103 | #endif |
104 | |
105 | #ifdef CONFIG_COMPAT |
106 | static void show_regwindow32(struct pt_regs *regs) |
107 | { |
108 | struct reg_window32 __user *rw; |
109 | struct reg_window32 r_w; |
110 | |
111 | __asm__ __volatile__ ("flushw" ); |
112 | rw = compat_ptr(uptr: (unsigned int)regs->u_regs[14]); |
113 | if (copy_from_user (to: &r_w, from: rw, n: sizeof(r_w))) { |
114 | return; |
115 | } |
116 | |
117 | printk("l0: %08x l1: %08x l2: %08x l3: %08x " |
118 | "l4: %08x l5: %08x l6: %08x l7: %08x\n" , |
119 | r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], |
120 | r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); |
121 | printk("i0: %08x i1: %08x i2: %08x i3: %08x " |
122 | "i4: %08x i5: %08x i6: %08x i7: %08x\n" , |
123 | r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], |
124 | r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); |
125 | } |
126 | #else |
127 | #define show_regwindow32(regs) do { } while (0) |
128 | #endif |
129 | |
130 | static void show_regwindow(struct pt_regs *regs) |
131 | { |
132 | struct reg_window __user *rw; |
133 | struct reg_window *rwk; |
134 | struct reg_window r_w; |
135 | |
136 | if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { |
137 | __asm__ __volatile__ ("flushw" ); |
138 | rw = (struct reg_window __user *) |
139 | (regs->u_regs[14] + STACK_BIAS); |
140 | rwk = (struct reg_window *) |
141 | (regs->u_regs[14] + STACK_BIAS); |
142 | if (!(regs->tstate & TSTATE_PRIV)) { |
143 | if (copy_from_user (to: &r_w, from: rw, n: sizeof(r_w))) { |
144 | return; |
145 | } |
146 | rwk = &r_w; |
147 | } |
148 | } else { |
149 | show_regwindow32(regs); |
150 | return; |
151 | } |
152 | printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n" , |
153 | rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); |
154 | printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n" , |
155 | rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); |
156 | printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n" , |
157 | rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); |
158 | printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n" , |
159 | rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); |
160 | if (regs->tstate & TSTATE_PRIV) |
161 | printk("I7: <%pS>\n" , (void *) rwk->ins[7]); |
162 | } |
163 | |
164 | void show_regs(struct pt_regs *regs) |
165 | { |
166 | show_regs_print_info(KERN_DEFAULT); |
167 | |
168 | printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n" , regs->tstate, |
169 | regs->tpc, regs->tnpc, regs->y, print_tainted()); |
170 | printk("TPC: <%pS>\n" , (void *) regs->tpc); |
171 | printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n" , |
172 | regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], |
173 | regs->u_regs[3]); |
174 | printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n" , |
175 | regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], |
176 | regs->u_regs[7]); |
177 | printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n" , |
178 | regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], |
179 | regs->u_regs[11]); |
180 | printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n" , |
181 | regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], |
182 | regs->u_regs[15]); |
183 | printk("RPC: <%pS>\n" , (void *) regs->u_regs[15]); |
184 | show_regwindow(regs); |
185 | show_stack(current, (unsigned long *)regs->u_regs[UREG_FP], KERN_DEFAULT); |
186 | } |
187 | |
188 | union global_cpu_snapshot global_cpu_snapshot[NR_CPUS]; |
189 | static DEFINE_SPINLOCK(global_cpu_snapshot_lock); |
190 | |
191 | static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, |
192 | int this_cpu) |
193 | { |
194 | struct global_reg_snapshot *rp; |
195 | |
196 | flushw_all(); |
197 | |
198 | rp = &global_cpu_snapshot[this_cpu].reg; |
199 | |
200 | rp->tstate = regs->tstate; |
201 | rp->tpc = regs->tpc; |
202 | rp->tnpc = regs->tnpc; |
203 | rp->o7 = regs->u_regs[UREG_I7]; |
204 | |
205 | if (regs->tstate & TSTATE_PRIV) { |
206 | struct reg_window *rw; |
207 | |
208 | rw = (struct reg_window *) |
209 | (regs->u_regs[UREG_FP] + STACK_BIAS); |
210 | if (kstack_valid(tp, sp: (unsigned long) rw)) { |
211 | rp->i7 = rw->ins[7]; |
212 | rw = (struct reg_window *) |
213 | (rw->ins[6] + STACK_BIAS); |
214 | if (kstack_valid(tp, sp: (unsigned long) rw)) |
215 | rp->rpc = rw->ins[7]; |
216 | } |
217 | } else { |
218 | rp->i7 = 0; |
219 | rp->rpc = 0; |
220 | } |
221 | rp->thread = tp; |
222 | } |
223 | |
224 | /* In order to avoid hangs we do not try to synchronize with the |
225 | * global register dump client cpus. The last store they make is to |
226 | * the thread pointer, so do a short poll waiting for that to become |
227 | * non-NULL. |
228 | */ |
229 | static void __global_reg_poll(struct global_reg_snapshot *gp) |
230 | { |
231 | int limit = 0; |
232 | |
233 | while (!gp->thread && ++limit < 100) { |
234 | barrier(); |
235 | udelay(1); |
236 | } |
237 | } |
238 | |
239 | void arch_trigger_cpumask_backtrace(const cpumask_t *mask, int exclude_cpu) |
240 | { |
241 | struct thread_info *tp = current_thread_info(); |
242 | struct pt_regs *regs = get_irq_regs(); |
243 | unsigned long flags; |
244 | int this_cpu, cpu; |
245 | |
246 | if (!regs) |
247 | regs = tp->kregs; |
248 | |
249 | spin_lock_irqsave(&global_cpu_snapshot_lock, flags); |
250 | |
251 | this_cpu = raw_smp_processor_id(); |
252 | |
253 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
254 | |
255 | if (cpumask_test_cpu(cpu: this_cpu, cpumask: mask) && this_cpu != exclude_cpu) |
256 | __global_reg_self(tp, regs, this_cpu); |
257 | |
258 | smp_fetch_global_regs(); |
259 | |
260 | for_each_cpu(cpu, mask) { |
261 | struct global_reg_snapshot *gp; |
262 | |
263 | if (cpu == exclude_cpu) |
264 | continue; |
265 | |
266 | gp = &global_cpu_snapshot[cpu].reg; |
267 | |
268 | __global_reg_poll(gp); |
269 | |
270 | tp = gp->thread; |
271 | printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n" , |
272 | (cpu == this_cpu ? '*' : ' '), cpu, |
273 | gp->tstate, gp->tpc, gp->tnpc, |
274 | ((tp && tp->task) ? tp->task->comm : "NULL" ), |
275 | ((tp && tp->task) ? tp->task->pid : -1)); |
276 | |
277 | if (gp->tstate & TSTATE_PRIV) { |
278 | printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n" , |
279 | (void *) gp->tpc, |
280 | (void *) gp->o7, |
281 | (void *) gp->i7, |
282 | (void *) gp->rpc); |
283 | } else { |
284 | printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n" , |
285 | gp->tpc, gp->o7, gp->i7, gp->rpc); |
286 | } |
287 | |
288 | touch_nmi_watchdog(); |
289 | } |
290 | |
291 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
292 | |
293 | spin_unlock_irqrestore(lock: &global_cpu_snapshot_lock, flags); |
294 | } |
295 | |
296 | #ifdef CONFIG_MAGIC_SYSRQ |
297 | |
298 | static void sysrq_handle_globreg(u8 key) |
299 | { |
300 | trigger_all_cpu_backtrace(); |
301 | } |
302 | |
303 | static const struct sysrq_key_op sparc_globalreg_op = { |
304 | .handler = sysrq_handle_globreg, |
305 | .help_msg = "global-regs(y)" , |
306 | .action_msg = "Show Global CPU Regs" , |
307 | }; |
308 | |
309 | static void __global_pmu_self(int this_cpu) |
310 | { |
311 | struct global_pmu_snapshot *pp; |
312 | int i, num; |
313 | |
314 | if (!pcr_ops) |
315 | return; |
316 | |
317 | pp = &global_cpu_snapshot[this_cpu].pmu; |
318 | |
319 | num = 1; |
320 | if (tlb_type == hypervisor && |
321 | sun4v_chip_type >= SUN4V_CHIP_NIAGARA4) |
322 | num = 4; |
323 | |
324 | for (i = 0; i < num; i++) { |
325 | pp->pcr[i] = pcr_ops->read_pcr(i); |
326 | pp->pic[i] = pcr_ops->read_pic(i); |
327 | } |
328 | } |
329 | |
330 | static void __global_pmu_poll(struct global_pmu_snapshot *pp) |
331 | { |
332 | int limit = 0; |
333 | |
334 | while (!pp->pcr[0] && ++limit < 100) { |
335 | barrier(); |
336 | udelay(1); |
337 | } |
338 | } |
339 | |
340 | static void pmu_snapshot_all_cpus(void) |
341 | { |
342 | unsigned long flags; |
343 | int this_cpu, cpu; |
344 | |
345 | spin_lock_irqsave(&global_cpu_snapshot_lock, flags); |
346 | |
347 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
348 | |
349 | this_cpu = raw_smp_processor_id(); |
350 | |
351 | __global_pmu_self(this_cpu); |
352 | |
353 | smp_fetch_global_pmu(); |
354 | |
355 | for_each_online_cpu(cpu) { |
356 | struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu; |
357 | |
358 | __global_pmu_poll(pp); |
359 | |
360 | printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n" , |
361 | (cpu == this_cpu ? '*' : ' '), cpu, |
362 | pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3], |
363 | pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]); |
364 | |
365 | touch_nmi_watchdog(); |
366 | } |
367 | |
368 | memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
369 | |
370 | spin_unlock_irqrestore(lock: &global_cpu_snapshot_lock, flags); |
371 | } |
372 | |
373 | static void sysrq_handle_globpmu(u8 key) |
374 | { |
375 | pmu_snapshot_all_cpus(); |
376 | } |
377 | |
378 | static const struct sysrq_key_op sparc_globalpmu_op = { |
379 | .handler = sysrq_handle_globpmu, |
380 | .help_msg = "global-pmu(x)" , |
381 | .action_msg = "Show Global PMU Regs" , |
382 | }; |
383 | |
384 | static int __init sparc_sysrq_init(void) |
385 | { |
386 | int ret = register_sysrq_key(key: 'y', op: &sparc_globalreg_op); |
387 | |
388 | if (!ret) |
389 | ret = register_sysrq_key(key: 'x', op: &sparc_globalpmu_op); |
390 | return ret; |
391 | } |
392 | |
393 | core_initcall(sparc_sysrq_init); |
394 | |
395 | #endif |
396 | |
397 | /* Free current thread data structures etc.. */ |
398 | void exit_thread(struct task_struct *tsk) |
399 | { |
400 | struct thread_info *t = task_thread_info(tsk); |
401 | |
402 | if (t->utraps) { |
403 | if (t->utraps[0] < 2) |
404 | kfree (objp: t->utraps); |
405 | else |
406 | t->utraps[0]--; |
407 | } |
408 | } |
409 | |
410 | void flush_thread(void) |
411 | { |
412 | struct thread_info *t = current_thread_info(); |
413 | struct mm_struct *mm; |
414 | |
415 | mm = t->task->mm; |
416 | if (mm) |
417 | tsb_context_switch(mm); |
418 | |
419 | set_thread_wsaved(0); |
420 | |
421 | /* Clear FPU register state. */ |
422 | t->fpsaved[0] = 0; |
423 | } |
424 | |
425 | /* It's a bit more tricky when 64-bit tasks are involved... */ |
426 | static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) |
427 | { |
428 | bool stack_64bit = test_thread_64bit_stack(psp); |
429 | unsigned long fp, distance, rval; |
430 | |
431 | if (stack_64bit) { |
432 | csp += STACK_BIAS; |
433 | psp += STACK_BIAS; |
434 | __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); |
435 | fp += STACK_BIAS; |
436 | if (test_thread_flag(TIF_32BIT)) |
437 | fp &= 0xffffffff; |
438 | } else |
439 | __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); |
440 | |
441 | /* Now align the stack as this is mandatory in the Sparc ABI |
442 | * due to how register windows work. This hides the |
443 | * restriction from thread libraries etc. |
444 | */ |
445 | csp &= ~15UL; |
446 | |
447 | distance = fp - psp; |
448 | rval = (csp - distance); |
449 | if (raw_copy_in_user((void __user *)rval, (void __user *)psp, distance)) |
450 | rval = 0; |
451 | else if (!stack_64bit) { |
452 | if (put_user(((u32)csp), |
453 | &(((struct reg_window32 __user *)rval)->ins[6]))) |
454 | rval = 0; |
455 | } else { |
456 | if (put_user(((u64)csp - STACK_BIAS), |
457 | &(((struct reg_window __user *)rval)->ins[6]))) |
458 | rval = 0; |
459 | else |
460 | rval = rval - STACK_BIAS; |
461 | } |
462 | |
463 | return rval; |
464 | } |
465 | |
466 | /* Standard stuff. */ |
467 | static inline void shift_window_buffer(int first_win, int last_win, |
468 | struct thread_info *t) |
469 | { |
470 | int i; |
471 | |
472 | for (i = first_win; i < last_win; i++) { |
473 | t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; |
474 | memcpy(&t->reg_window[i], &t->reg_window[i+1], |
475 | sizeof(struct reg_window)); |
476 | } |
477 | } |
478 | |
479 | void synchronize_user_stack(void) |
480 | { |
481 | struct thread_info *t = current_thread_info(); |
482 | unsigned long window; |
483 | |
484 | flush_user_windows(); |
485 | if ((window = get_thread_wsaved()) != 0) { |
486 | window -= 1; |
487 | do { |
488 | struct reg_window *rwin = &t->reg_window[window]; |
489 | int winsize = sizeof(struct reg_window); |
490 | unsigned long sp; |
491 | |
492 | sp = t->rwbuf_stkptrs[window]; |
493 | |
494 | if (test_thread_64bit_stack(sp)) |
495 | sp += STACK_BIAS; |
496 | else |
497 | winsize = sizeof(struct reg_window32); |
498 | |
499 | if (!copy_to_user(to: (char __user *)sp, from: rwin, n: winsize)) { |
500 | shift_window_buffer(first_win: window, last_win: get_thread_wsaved() - 1, t); |
501 | set_thread_wsaved(get_thread_wsaved() - 1); |
502 | } |
503 | } while (window--); |
504 | } |
505 | } |
506 | |
507 | static void stack_unaligned(unsigned long sp) |
508 | { |
509 | force_sig_fault(SIGBUS, BUS_ADRALN, addr: (void __user *) sp); |
510 | } |
511 | |
512 | static const char uwfault32[] = KERN_INFO \ |
513 | "%s[%d]: bad register window fault: SP %08lx (orig_sp %08lx) TPC %08lx O7 %08lx\n" ; |
514 | static const char uwfault64[] = KERN_INFO \ |
515 | "%s[%d]: bad register window fault: SP %016lx (orig_sp %016lx) TPC %08lx O7 %016lx\n" ; |
516 | |
517 | void fault_in_user_windows(struct pt_regs *regs) |
518 | { |
519 | struct thread_info *t = current_thread_info(); |
520 | unsigned long window; |
521 | |
522 | flush_user_windows(); |
523 | window = get_thread_wsaved(); |
524 | |
525 | if (likely(window != 0)) { |
526 | window -= 1; |
527 | do { |
528 | struct reg_window *rwin = &t->reg_window[window]; |
529 | int winsize = sizeof(struct reg_window); |
530 | unsigned long sp, orig_sp; |
531 | |
532 | orig_sp = sp = t->rwbuf_stkptrs[window]; |
533 | |
534 | if (test_thread_64bit_stack(sp)) |
535 | sp += STACK_BIAS; |
536 | else |
537 | winsize = sizeof(struct reg_window32); |
538 | |
539 | if (unlikely(sp & 0x7UL)) |
540 | stack_unaligned(sp); |
541 | |
542 | if (unlikely(copy_to_user((char __user *)sp, |
543 | rwin, winsize))) { |
544 | if (show_unhandled_signals) |
545 | printk_ratelimited(is_compat_task() ? |
546 | uwfault32 : uwfault64, |
547 | current->comm, current->pid, |
548 | sp, orig_sp, |
549 | regs->tpc, |
550 | regs->u_regs[UREG_I7]); |
551 | goto barf; |
552 | } |
553 | } while (window--); |
554 | } |
555 | set_thread_wsaved(0); |
556 | return; |
557 | |
558 | barf: |
559 | set_thread_wsaved(window + 1); |
560 | force_sig(SIGSEGV); |
561 | } |
562 | |
563 | /* Copy a Sparc thread. The fork() return value conventions |
564 | * under SunOS are nothing short of bletcherous: |
565 | * Parent --> %o0 == childs pid, %o1 == 0 |
566 | * Child --> %o0 == parents pid, %o1 == 1 |
567 | */ |
568 | int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) |
569 | { |
570 | unsigned long clone_flags = args->flags; |
571 | unsigned long sp = args->stack; |
572 | unsigned long tls = args->tls; |
573 | struct thread_info *t = task_thread_info(p); |
574 | struct pt_regs *regs = current_pt_regs(); |
575 | struct sparc_stackf *parent_sf; |
576 | unsigned long child_stack_sz; |
577 | char *child_trap_frame; |
578 | |
579 | /* Calculate offset to stack_frame & pt_regs */ |
580 | child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ); |
581 | child_trap_frame = (task_stack_page(task: p) + |
582 | (THREAD_SIZE - child_stack_sz)); |
583 | |
584 | t->new_child = 1; |
585 | t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
586 | t->kregs = (struct pt_regs *) (child_trap_frame + |
587 | sizeof(struct sparc_stackf)); |
588 | t->fpsaved[0] = 0; |
589 | |
590 | if (unlikely(args->fn)) { |
591 | memset(child_trap_frame, 0, child_stack_sz); |
592 | __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = |
593 | (current_pt_regs()->tstate + 1) & TSTATE_CWP; |
594 | t->kregs->u_regs[UREG_G1] = (unsigned long) args->fn; |
595 | t->kregs->u_regs[UREG_G2] = (unsigned long) args->fn_arg; |
596 | return 0; |
597 | } |
598 | |
599 | parent_sf = ((struct sparc_stackf *) regs) - 1; |
600 | memcpy(child_trap_frame, parent_sf, child_stack_sz); |
601 | if (t->flags & _TIF_32BIT) { |
602 | sp &= 0x00000000ffffffffUL; |
603 | regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; |
604 | } |
605 | t->kregs->u_regs[UREG_FP] = sp; |
606 | __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = |
607 | (regs->tstate + 1) & TSTATE_CWP; |
608 | if (sp != regs->u_regs[UREG_FP]) { |
609 | unsigned long csp; |
610 | |
611 | csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); |
612 | if (!csp) |
613 | return -EFAULT; |
614 | t->kregs->u_regs[UREG_FP] = csp; |
615 | } |
616 | if (t->utraps) |
617 | t->utraps[0]++; |
618 | |
619 | /* Set the return value for the child. */ |
620 | t->kregs->u_regs[UREG_I0] = current->pid; |
621 | t->kregs->u_regs[UREG_I1] = 1; |
622 | |
623 | /* Set the second return value for the parent. */ |
624 | regs->u_regs[UREG_I1] = 0; |
625 | |
626 | if (clone_flags & CLONE_SETTLS) |
627 | t->kregs->u_regs[UREG_G7] = tls; |
628 | |
629 | return 0; |
630 | } |
631 | |
632 | /* TIF_MCDPER in thread info flags for current task is updated lazily upon |
633 | * a context switch. Update this flag in current task's thread flags |
634 | * before dup so the dup'd task will inherit the current TIF_MCDPER flag. |
635 | */ |
636 | int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) |
637 | { |
638 | if (adi_capable()) { |
639 | register unsigned long tmp_mcdper; |
640 | |
641 | __asm__ __volatile__( |
642 | ".word 0x83438000\n\t" /* rd %mcdper, %g1 */ |
643 | "mov %%g1, %0\n\t" |
644 | : "=r" (tmp_mcdper) |
645 | : |
646 | : "g1" ); |
647 | if (tmp_mcdper) |
648 | set_thread_flag(TIF_MCDPER); |
649 | else |
650 | clear_thread_flag(TIF_MCDPER); |
651 | } |
652 | |
653 | *dst = *src; |
654 | return 0; |
655 | } |
656 | |
657 | unsigned long __get_wchan(struct task_struct *task) |
658 | { |
659 | unsigned long pc, fp, bias = 0; |
660 | struct thread_info *tp; |
661 | struct reg_window *rw; |
662 | unsigned long ret = 0; |
663 | int count = 0; |
664 | |
665 | tp = task_thread_info(task); |
666 | bias = STACK_BIAS; |
667 | fp = task_thread_info(task)->ksp + bias; |
668 | |
669 | do { |
670 | if (!kstack_valid(tp, sp: fp)) |
671 | break; |
672 | rw = (struct reg_window *) fp; |
673 | pc = rw->ins[7]; |
674 | if (!in_sched_functions(addr: pc)) { |
675 | ret = pc; |
676 | goto out; |
677 | } |
678 | fp = rw->ins[6] + bias; |
679 | } while (++count < 16); |
680 | |
681 | out: |
682 | return ret; |
683 | } |
684 | |