process.c (172ae2e7f8ff9053905a36672453a6d2ff95b182) process.c (3bffb6529cf10d48a97ac0d6d789986894c25c37)
1/*
2 * Derived from "arch/i386/kernel/process.c"
3 * Copyright (C) 1995 Linus Torvalds
4 *
5 * Updated and modified by Cort Dougan (cort@cs.nmt.edu) and
6 * Paul Mackerras (paulus@cs.anu.edu.au)
7 *
8 * PowerPC version

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240#ifdef CONFIG_SPE
241 if (last_task_used_spe == current)
242 last_task_used_spe = NULL;
243#endif
244 preempt_enable();
245}
246#endif /* CONFIG_SMP */
247
1/*
2 * Derived from "arch/i386/kernel/process.c"
3 * Copyright (C) 1995 Linus Torvalds
4 *
5 * Updated and modified by Cort Dougan (cort@cs.nmt.edu) and
6 * Paul Mackerras (paulus@cs.anu.edu.au)
7 *
8 * PowerPC version

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240#ifdef CONFIG_SPE
241 if (last_task_used_spe == current)
242 last_task_used_spe = NULL;
243#endif
244 preempt_enable();
245}
246#endif /* CONFIG_SMP */
247
248#ifdef CONFIG_PPC_ADV_DEBUG_REGS
249void do_send_trap(struct pt_regs *regs, unsigned long address,
250 unsigned long error_code, int signal_code, int breakpt)
251{
252 siginfo_t info;
253
254 if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code,
255 11, SIGSEGV) == NOTIFY_STOP)
256 return;
257
258 /* Deliver the signal to userspace */
259 info.si_signo = SIGTRAP;
260 info.si_errno = breakpt; /* breakpoint or watchpoint id */
261 info.si_code = signal_code;
262 info.si_addr = (void __user *)address;
263 force_sig_info(SIGTRAP, &info, current);
264}
265#else /* !CONFIG_PPC_ADV_DEBUG_REGS */
248void do_dabr(struct pt_regs *regs, unsigned long address,
249 unsigned long error_code)
250{
251 siginfo_t info;
252
253 if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code,
254 11, SIGSEGV) == NOTIFY_STOP)
255 return;
256
257 if (debugger_dabr_match(regs))
258 return;
259
266void do_dabr(struct pt_regs *regs, unsigned long address,
267 unsigned long error_code)
268{
269 siginfo_t info;
270
271 if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code,
272 11, SIGSEGV) == NOTIFY_STOP)
273 return;
274
275 if (debugger_dabr_match(regs))
276 return;
277
260 /* Clear the DAC and struct entries. One shot trigger */
261#ifdef CONFIG_PPC_ADV_DEBUG_REGS
262 mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~(DBSR_DAC1R | DBSR_DAC1W
263 | DBCR0_IDM));
264#endif
265
266 /* Clear the DABR */
267 set_dabr(0);
268
269 /* Deliver the signal to userspace */
270 info.si_signo = SIGTRAP;
271 info.si_errno = 0;
272 info.si_code = TRAP_HWBKPT;
273 info.si_addr = (void __user *)address;
274 force_sig_info(SIGTRAP, &info, current);
275}
278 /* Clear the DABR */
279 set_dabr(0);
280
281 /* Deliver the signal to userspace */
282 info.si_signo = SIGTRAP;
283 info.si_errno = 0;
284 info.si_code = TRAP_HWBKPT;
285 info.si_addr = (void __user *)address;
286 force_sig_info(SIGTRAP, &info, current);
287}
288#endif /* CONFIG_PPC_ADV_DEBUG_REGS */
276
277static DEFINE_PER_CPU(unsigned long, current_dabr);
278
289
290static DEFINE_PER_CPU(unsigned long, current_dabr);
291
292#ifdef CONFIG_PPC_ADV_DEBUG_REGS
293/*
294 * Set the debug registers back to their default "safe" values.
295 */
296static void set_debug_reg_defaults(struct thread_struct *thread)
297{
298 thread->iac1 = thread->iac2 = 0;
299#if CONFIG_PPC_ADV_DEBUG_IACS > 2
300 thread->iac3 = thread->iac4 = 0;
301#endif
302 thread->dac1 = thread->dac2 = 0;
303#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
304 thread->dvc1 = thread->dvc2 = 0;
305#endif
306 thread->dbcr0 = 0;
307#ifdef CONFIG_BOOKE
308 /*
309 * Force User/Supervisor bits to b11 (user-only MSR[PR]=1)
310 */
311 thread->dbcr1 = DBCR1_IAC1US | DBCR1_IAC2US | \
312 DBCR1_IAC3US | DBCR1_IAC4US;
313 /*
314 * Force Data Address Compare User/Supervisor bits to be User-only
315 * (0b11 MSR[PR]=1) and set all other bits in DBCR2 register to be 0.
316 */
317 thread->dbcr2 = DBCR2_DAC1US | DBCR2_DAC2US;
318#else
319 thread->dbcr1 = 0;
320#endif
321}
322
323static void prime_debug_regs(struct thread_struct *thread)
324{
325 mtspr(SPRN_IAC1, thread->iac1);
326 mtspr(SPRN_IAC2, thread->iac2);
327#if CONFIG_PPC_ADV_DEBUG_IACS > 2
328 mtspr(SPRN_IAC3, thread->iac3);
329 mtspr(SPRN_IAC4, thread->iac4);
330#endif
331 mtspr(SPRN_DAC1, thread->dac1);
332 mtspr(SPRN_DAC2, thread->dac2);
333#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
334 mtspr(SPRN_DVC1, thread->dvc1);
335 mtspr(SPRN_DVC2, thread->dvc2);
336#endif
337 mtspr(SPRN_DBCR0, thread->dbcr0);
338 mtspr(SPRN_DBCR1, thread->dbcr1);
339#ifdef CONFIG_BOOKE
340 mtspr(SPRN_DBCR2, thread->dbcr2);
341#endif
342}
343/*
344 * Unless neither the old or new thread are making use of the
345 * debug registers, set the debug registers from the values
346 * stored in the new thread.
347 */
348static void switch_booke_debug_regs(struct thread_struct *new_thread)
349{
350 if ((current->thread.dbcr0 & DBCR0_IDM)
351 || (new_thread->dbcr0 & DBCR0_IDM))
352 prime_debug_regs(new_thread);
353}
354#else /* !CONFIG_PPC_ADV_DEBUG_REGS */
355static void set_debug_reg_defaults(struct thread_struct *thread)
356{
357 if (thread->dabr) {
358 thread->dabr = 0;
359 set_dabr(0);
360 }
361}
362#endif /* CONFIG_PPC_ADV_DEBUG_REGS */
363
279int set_dabr(unsigned long dabr)
280{
281 __get_cpu_var(current_dabr) = dabr;
282
283 if (ppc_md.set_dabr)
284 return ppc_md.set_dabr(dabr);
285
286 /* XXX should we have a CPU_FTR_HAS_DABR ? */

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367 */
368 if (new->thread.regs && last_task_used_spe == new)
369 new->thread.regs->msr |= MSR_SPE;
370#endif /* CONFIG_SPE */
371
372#endif /* CONFIG_SMP */
373
374#ifdef CONFIG_PPC_ADV_DEBUG_REGS
364int set_dabr(unsigned long dabr)
365{
366 __get_cpu_var(current_dabr) = dabr;
367
368 if (ppc_md.set_dabr)
369 return ppc_md.set_dabr(dabr);
370
371 /* XXX should we have a CPU_FTR_HAS_DABR ? */

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452 */
453 if (new->thread.regs && last_task_used_spe == new)
454 new->thread.regs->msr |= MSR_SPE;
455#endif /* CONFIG_SPE */
456
457#endif /* CONFIG_SMP */
458
459#ifdef CONFIG_PPC_ADV_DEBUG_REGS
375 /* If new thread DAC (HW breakpoint) is the same then leave it */
376 if (new->thread.dabr)
377 set_dabr(new->thread.dabr);
460 switch_booke_debug_regs(&new->thread);
378#else
379 if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr))
380 set_dabr(new->thread.dabr);
381#endif
382
383
384 new_thread = &new->thread;
385 old_thread = &current->thread;

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551{
552 discard_lazy_cpu_state();
553}
554
555void flush_thread(void)
556{
557 discard_lazy_cpu_state();
558
461#else
462 if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr))
463 set_dabr(new->thread.dabr);
464#endif
465
466
467 new_thread = &new->thread;
468 old_thread = &current->thread;

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634{
635 discard_lazy_cpu_state();
636}
637
638void flush_thread(void)
639{
640 discard_lazy_cpu_state();
641
559 if (current->thread.dabr) {
560 current->thread.dabr = 0;
561 set_dabr(0);
562
563#ifdef CONFIG_PPC_ADV_DEBUG_REGS
564 current->thread.dbcr0 &= ~(DBSR_DAC1R | DBSR_DAC1W);
565#endif
566 }
642 set_debug_reg_defaults(&current->thread);
567}
568
569void
570release_thread(struct task_struct *t)
571{
572}
573
574/*

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644
645void
646release_thread(struct task_struct *t)
647{
648}
649
650/*

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