2 * Derived from "arch/i386/kernel/process.c"
3 * Copyright (C) 1995 Linus Torvalds
5 * Updated and modified by Cort Dougan (cort@cs.nmt.edu) and
6 * Paul Mackerras (paulus@cs.anu.edu.au)
9 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
17 #include <linux/errno.h>
18 #include <linux/sched.h>
19 #include <linux/kernel.h>
21 #include <linux/smp.h>
22 #include <linux/stddef.h>
23 #include <linux/unistd.h>
24 #include <linux/ptrace.h>
25 #include <linux/slab.h>
26 #include <linux/user.h>
27 #include <linux/elf.h>
28 #include <linux/init.h>
29 #include <linux/prctl.h>
30 #include <linux/init_task.h>
31 #include <linux/module.h>
32 #include <linux/kallsyms.h>
33 #include <linux/mqueue.h>
34 #include <linux/hardirq.h>
35 #include <linux/utsname.h>
36 #include <linux/kernel_stat.h>
38 #include <asm/pgtable.h>
39 #include <asm/uaccess.h>
40 #include <asm/system.h>
42 #include <asm/processor.h>
45 #include <asm/machdep.h>
47 #include <asm/syscalls.h>
49 #include <asm/firmware.h>
51 #include <linux/kprobes.h>
52 #include <linux/kdebug.h>
54 extern unsigned long _get_SP(void);
57 struct task_struct
*last_task_used_math
= NULL
;
58 struct task_struct
*last_task_used_altivec
= NULL
;
59 struct task_struct
*last_task_used_vsx
= NULL
;
60 struct task_struct
*last_task_used_spe
= NULL
;
64 * Make sure the floating-point register state in the
65 * the thread_struct is up to date for task tsk.
67 void flush_fp_to_thread(struct task_struct
*tsk
)
69 if (tsk
->thread
.regs
) {
71 * We need to disable preemption here because if we didn't,
72 * another process could get scheduled after the regs->msr
73 * test but before we have finished saving the FP registers
74 * to the thread_struct. That process could take over the
75 * FPU, and then when we get scheduled again we would store
76 * bogus values for the remaining FP registers.
79 if (tsk
->thread
.regs
->msr
& MSR_FP
) {
82 * This should only ever be called for current or
83 * for a stopped child process. Since we save away
84 * the FP register state on context switch on SMP,
85 * there is something wrong if a stopped child appears
86 * to still have its FP state in the CPU registers.
88 BUG_ON(tsk
!= current
);
96 void enable_kernel_fp(void)
98 WARN_ON(preemptible());
101 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_FP
))
104 giveup_fpu(NULL
); /* just enables FP for kernel */
106 giveup_fpu(last_task_used_math
);
107 #endif /* CONFIG_SMP */
109 EXPORT_SYMBOL(enable_kernel_fp
);
111 #ifdef CONFIG_ALTIVEC
112 void enable_kernel_altivec(void)
114 WARN_ON(preemptible());
117 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_VEC
))
118 giveup_altivec(current
);
120 giveup_altivec(NULL
); /* just enable AltiVec for kernel - force */
122 giveup_altivec(last_task_used_altivec
);
123 #endif /* CONFIG_SMP */
125 EXPORT_SYMBOL(enable_kernel_altivec
);
128 * Make sure the VMX/Altivec register state in the
129 * the thread_struct is up to date for task tsk.
131 void flush_altivec_to_thread(struct task_struct
*tsk
)
133 if (tsk
->thread
.regs
) {
135 if (tsk
->thread
.regs
->msr
& MSR_VEC
) {
137 BUG_ON(tsk
!= current
);
144 #endif /* CONFIG_ALTIVEC */
148 /* not currently used, but some crazy RAID module might want to later */
149 void enable_kernel_vsx(void)
151 WARN_ON(preemptible());
154 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_VSX
))
157 giveup_vsx(NULL
); /* just enable vsx for kernel - force */
159 giveup_vsx(last_task_used_vsx
);
160 #endif /* CONFIG_SMP */
162 EXPORT_SYMBOL(enable_kernel_vsx
);
165 void giveup_vsx(struct task_struct
*tsk
)
172 void flush_vsx_to_thread(struct task_struct
*tsk
)
174 if (tsk
->thread
.regs
) {
176 if (tsk
->thread
.regs
->msr
& MSR_VSX
) {
178 BUG_ON(tsk
!= current
);
185 #endif /* CONFIG_VSX */
189 void enable_kernel_spe(void)
191 WARN_ON(preemptible());
194 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_SPE
))
197 giveup_spe(NULL
); /* just enable SPE for kernel - force */
199 giveup_spe(last_task_used_spe
);
200 #endif /* __SMP __ */
202 EXPORT_SYMBOL(enable_kernel_spe
);
204 void flush_spe_to_thread(struct task_struct
*tsk
)
206 if (tsk
->thread
.regs
) {
208 if (tsk
->thread
.regs
->msr
& MSR_SPE
) {
210 BUG_ON(tsk
!= current
);
217 #endif /* CONFIG_SPE */
221 * If we are doing lazy switching of CPU state (FP, altivec or SPE),
222 * and the current task has some state, discard it.
224 void discard_lazy_cpu_state(void)
227 if (last_task_used_math
== current
)
228 last_task_used_math
= NULL
;
229 #ifdef CONFIG_ALTIVEC
230 if (last_task_used_altivec
== current
)
231 last_task_used_altivec
= NULL
;
232 #endif /* CONFIG_ALTIVEC */
234 if (last_task_used_vsx
== current
)
235 last_task_used_vsx
= NULL
;
236 #endif /* CONFIG_VSX */
238 if (last_task_used_spe
== current
)
239 last_task_used_spe
= NULL
;
243 #endif /* CONFIG_SMP */
245 void do_dabr(struct pt_regs
*regs
, unsigned long address
,
246 unsigned long error_code
)
250 if (notify_die(DIE_DABR_MATCH
, "dabr_match", regs
, error_code
,
251 11, SIGSEGV
) == NOTIFY_STOP
)
254 if (debugger_dabr_match(regs
))
257 /* Clear the DAC and struct entries. One shot trigger */
258 #if defined(CONFIG_BOOKE)
259 mtspr(SPRN_DBCR0
, mfspr(SPRN_DBCR0
) & ~(DBSR_DAC1R
| DBSR_DAC1W
266 /* Deliver the signal to userspace */
267 info
.si_signo
= SIGTRAP
;
269 info
.si_code
= TRAP_HWBKPT
;
270 info
.si_addr
= (void __user
*)address
;
271 force_sig_info(SIGTRAP
, &info
, current
);
274 static DEFINE_PER_CPU(unsigned long, current_dabr
);
276 int set_dabr(unsigned long dabr
)
278 __get_cpu_var(current_dabr
) = dabr
;
281 return ppc_md
.set_dabr(dabr
);
283 /* XXX should we have a CPU_FTR_HAS_DABR ? */
284 #if defined(CONFIG_PPC64) || defined(CONFIG_6xx)
285 mtspr(SPRN_DABR
, dabr
);
288 #if defined(CONFIG_BOOKE)
289 mtspr(SPRN_DAC1
, dabr
);
296 DEFINE_PER_CPU(struct cpu_usage
, cpu_usage_array
);
299 struct task_struct
*__switch_to(struct task_struct
*prev
,
300 struct task_struct
*new)
302 struct thread_struct
*new_thread
, *old_thread
;
304 struct task_struct
*last
;
307 /* avoid complexity of lazy save/restore of fpu
308 * by just saving it every time we switch out if
309 * this task used the fpu during the last quantum.
311 * If it tries to use the fpu again, it'll trap and
312 * reload its fp regs. So we don't have to do a restore
313 * every switch, just a save.
316 if (prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_FP
))
318 #ifdef CONFIG_ALTIVEC
320 * If the previous thread used altivec in the last quantum
321 * (thus changing altivec regs) then save them.
322 * We used to check the VRSAVE register but not all apps
323 * set it, so we don't rely on it now (and in fact we need
324 * to save & restore VSCR even if VRSAVE == 0). -- paulus
326 * On SMP we always save/restore altivec regs just to avoid the
327 * complexity of changing processors.
330 if (prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_VEC
))
331 giveup_altivec(prev
);
332 #endif /* CONFIG_ALTIVEC */
334 if (prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_VSX
))
335 /* VMX and FPU registers are already save here */
337 #endif /* CONFIG_VSX */
340 * If the previous thread used spe in the last quantum
341 * (thus changing spe regs) then save them.
343 * On SMP we always save/restore spe regs just to avoid the
344 * complexity of changing processors.
346 if ((prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_SPE
)))
348 #endif /* CONFIG_SPE */
350 #else /* CONFIG_SMP */
351 #ifdef CONFIG_ALTIVEC
352 /* Avoid the trap. On smp this this never happens since
353 * we don't set last_task_used_altivec -- Cort
355 if (new->thread
.regs
&& last_task_used_altivec
== new)
356 new->thread
.regs
->msr
|= MSR_VEC
;
357 #endif /* CONFIG_ALTIVEC */
359 if (new->thread
.regs
&& last_task_used_vsx
== new)
360 new->thread
.regs
->msr
|= MSR_VSX
;
361 #endif /* CONFIG_VSX */
363 /* Avoid the trap. On smp this this never happens since
364 * we don't set last_task_used_spe
366 if (new->thread
.regs
&& last_task_used_spe
== new)
367 new->thread
.regs
->msr
|= MSR_SPE
;
368 #endif /* CONFIG_SPE */
370 #endif /* CONFIG_SMP */
372 if (unlikely(__get_cpu_var(current_dabr
) != new->thread
.dabr
))
373 set_dabr(new->thread
.dabr
);
375 #if defined(CONFIG_BOOKE)
376 /* If new thread DAC (HW breakpoint) is the same then leave it */
377 if (new->thread
.dabr
)
378 set_dabr(new->thread
.dabr
);
381 new_thread
= &new->thread
;
382 old_thread
= ¤t
->thread
;
386 * Collect processor utilization data per process
388 if (firmware_has_feature(FW_FEATURE_SPLPAR
)) {
389 struct cpu_usage
*cu
= &__get_cpu_var(cpu_usage_array
);
390 long unsigned start_tb
, current_tb
;
391 start_tb
= old_thread
->start_tb
;
392 cu
->current_tb
= current_tb
= mfspr(SPRN_PURR
);
393 old_thread
->accum_tb
+= (current_tb
- start_tb
);
394 new_thread
->start_tb
= current_tb
;
398 local_irq_save(flags
);
400 account_system_vtime(current
);
401 account_process_vtime(current
);
402 calculate_steal_time();
405 * We can't take a PMU exception inside _switch() since there is a
406 * window where the kernel stack SLB and the kernel stack are out
407 * of sync. Hard disable here.
410 last
= _switch(old_thread
, new_thread
);
412 local_irq_restore(flags
);
417 static int instructions_to_print
= 16;
419 static void show_instructions(struct pt_regs
*regs
)
422 unsigned long pc
= regs
->nip
- (instructions_to_print
* 3 / 4 *
425 printk("Instruction dump:");
427 for (i
= 0; i
< instructions_to_print
; i
++) {
433 #if !defined(CONFIG_BOOKE)
434 /* If executing with the IMMU off, adjust pc rather
435 * than print XXXXXXXX.
437 if (!(regs
->msr
& MSR_IR
))
438 pc
= (unsigned long)phys_to_virt(pc
);
441 /* We use __get_user here *only* to avoid an OOPS on a
442 * bad address because the pc *should* only be a
445 if (!__kernel_text_address(pc
) ||
446 __get_user(instr
, (unsigned int __user
*)pc
)) {
450 printk("<%08x> ", instr
);
452 printk("%08x ", instr
);
461 static struct regbit
{
478 static void printbits(unsigned long val
, struct regbit
*bits
)
480 const char *sep
= "";
483 for (; bits
->bit
; ++bits
)
484 if (val
& bits
->bit
) {
485 printk("%s%s", sep
, bits
->name
);
493 #define REGS_PER_LINE 4
494 #define LAST_VOLATILE 13
497 #define REGS_PER_LINE 8
498 #define LAST_VOLATILE 12
501 void show_regs(struct pt_regs
* regs
)
505 printk("NIP: "REG
" LR: "REG
" CTR: "REG
"\n",
506 regs
->nip
, regs
->link
, regs
->ctr
);
507 printk("REGS: %p TRAP: %04lx %s (%s)\n",
508 regs
, regs
->trap
, print_tainted(), init_utsname()->release
);
509 printk("MSR: "REG
" ", regs
->msr
);
510 printbits(regs
->msr
, msr_bits
);
511 printk(" CR: %08lx XER: %08lx\n", regs
->ccr
, regs
->xer
);
513 if (trap
== 0x300 || trap
== 0x600)
514 #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
515 printk("DEAR: "REG
", ESR: "REG
"\n", regs
->dar
, regs
->dsisr
);
517 printk("DAR: "REG
", DSISR: "REG
"\n", regs
->dar
, regs
->dsisr
);
519 printk("TASK = %p[%d] '%s' THREAD: %p",
520 current
, task_pid_nr(current
), current
->comm
, task_thread_info(current
));
523 printk(" CPU: %d", raw_smp_processor_id());
524 #endif /* CONFIG_SMP */
526 for (i
= 0; i
< 32; i
++) {
527 if ((i
% REGS_PER_LINE
) == 0)
528 printk("\n" KERN_INFO
"GPR%02d: ", i
);
529 printk(REG
" ", regs
->gpr
[i
]);
530 if (i
== LAST_VOLATILE
&& !FULL_REGS(regs
))
534 #ifdef CONFIG_KALLSYMS
536 * Lookup NIP late so we have the best change of getting the
537 * above info out without failing
539 printk("NIP ["REG
"] %pS\n", regs
->nip
, (void *)regs
->nip
);
540 printk("LR ["REG
"] %pS\n", regs
->link
, (void *)regs
->link
);
542 show_stack(current
, (unsigned long *) regs
->gpr
[1]);
543 if (!user_mode(regs
))
544 show_instructions(regs
);
547 void exit_thread(void)
549 discard_lazy_cpu_state();
552 void flush_thread(void)
555 struct thread_info
*t
= current_thread_info();
557 if (test_ti_thread_flag(t
, TIF_ABI_PENDING
)) {
558 clear_ti_thread_flag(t
, TIF_ABI_PENDING
);
559 if (test_ti_thread_flag(t
, TIF_32BIT
))
560 clear_ti_thread_flag(t
, TIF_32BIT
);
562 set_ti_thread_flag(t
, TIF_32BIT
);
566 discard_lazy_cpu_state();
568 if (current
->thread
.dabr
) {
569 current
->thread
.dabr
= 0;
572 #if defined(CONFIG_BOOKE)
573 current
->thread
.dbcr0
&= ~(DBSR_DAC1R
| DBSR_DAC1W
);
579 release_thread(struct task_struct
*t
)
584 * This gets called before we allocate a new thread and copy
585 * the current task into it.
587 void prepare_to_copy(struct task_struct
*tsk
)
589 flush_fp_to_thread(current
);
590 flush_altivec_to_thread(current
);
591 flush_vsx_to_thread(current
);
592 flush_spe_to_thread(current
);
598 int copy_thread(int nr
, unsigned long clone_flags
, unsigned long usp
,
599 unsigned long unused
, struct task_struct
*p
,
600 struct pt_regs
*regs
)
602 struct pt_regs
*childregs
, *kregs
;
603 extern void ret_from_fork(void);
604 unsigned long sp
= (unsigned long)task_stack_page(p
) + THREAD_SIZE
;
606 CHECK_FULL_REGS(regs
);
608 sp
-= sizeof(struct pt_regs
);
609 childregs
= (struct pt_regs
*) sp
;
611 if ((childregs
->msr
& MSR_PR
) == 0) {
612 /* for kernel thread, set `current' and stackptr in new task */
613 childregs
->gpr
[1] = sp
+ sizeof(struct pt_regs
);
615 childregs
->gpr
[2] = (unsigned long) p
;
617 clear_tsk_thread_flag(p
, TIF_32BIT
);
619 p
->thread
.regs
= NULL
; /* no user register state */
621 childregs
->gpr
[1] = usp
;
622 p
->thread
.regs
= childregs
;
623 if (clone_flags
& CLONE_SETTLS
) {
625 if (!test_thread_flag(TIF_32BIT
))
626 childregs
->gpr
[13] = childregs
->gpr
[6];
629 childregs
->gpr
[2] = childregs
->gpr
[6];
632 childregs
->gpr
[3] = 0; /* Result from fork() */
633 sp
-= STACK_FRAME_OVERHEAD
;
636 * The way this works is that at some point in the future
637 * some task will call _switch to switch to the new task.
638 * That will pop off the stack frame created below and start
639 * the new task running at ret_from_fork. The new task will
640 * do some house keeping and then return from the fork or clone
641 * system call, using the stack frame created above.
643 sp
-= sizeof(struct pt_regs
);
644 kregs
= (struct pt_regs
*) sp
;
645 sp
-= STACK_FRAME_OVERHEAD
;
647 p
->thread
.ksp_limit
= (unsigned long)task_stack_page(p
) +
648 _ALIGN_UP(sizeof(struct thread_info
), 16);
651 if (cpu_has_feature(CPU_FTR_SLB
)) {
652 unsigned long sp_vsid
;
653 unsigned long llp
= mmu_psize_defs
[mmu_linear_psize
].sllp
;
655 if (cpu_has_feature(CPU_FTR_1T_SEGMENT
))
656 sp_vsid
= get_kernel_vsid(sp
, MMU_SEGSIZE_1T
)
657 << SLB_VSID_SHIFT_1T
;
659 sp_vsid
= get_kernel_vsid(sp
, MMU_SEGSIZE_256M
)
661 sp_vsid
|= SLB_VSID_KERNEL
| llp
;
662 p
->thread
.ksp_vsid
= sp_vsid
;
666 * The PPC64 ABI makes use of a TOC to contain function
667 * pointers. The function (ret_from_except) is actually a pointer
668 * to the TOC entry. The first entry is a pointer to the actual
671 kregs
->nip
= *((unsigned long *)ret_from_fork
);
673 kregs
->nip
= (unsigned long)ret_from_fork
;
680 * Set up a thread for executing a new program
682 void start_thread(struct pt_regs
*regs
, unsigned long start
, unsigned long sp
)
685 unsigned long load_addr
= regs
->gpr
[2]; /* saved by ELF_PLAT_INIT */
691 * If we exec out of a kernel thread then thread.regs will not be
694 if (!current
->thread
.regs
) {
695 struct pt_regs
*regs
= task_stack_page(current
) + THREAD_SIZE
;
696 current
->thread
.regs
= regs
- 1;
699 memset(regs
->gpr
, 0, sizeof(regs
->gpr
));
707 * We have just cleared all the nonvolatile GPRs, so make
708 * FULL_REGS(regs) return true. This is necessary to allow
709 * ptrace to examine the thread immediately after exec.
716 regs
->msr
= MSR_USER
;
718 if (!test_thread_flag(TIF_32BIT
)) {
719 unsigned long entry
, toc
;
721 /* start is a relocated pointer to the function descriptor for
722 * the elf _start routine. The first entry in the function
723 * descriptor is the entry address of _start and the second
724 * entry is the TOC value we need to use.
726 __get_user(entry
, (unsigned long __user
*)start
);
727 __get_user(toc
, (unsigned long __user
*)start
+1);
729 /* Check whether the e_entry function descriptor entries
730 * need to be relocated before we can use them.
732 if (load_addr
!= 0) {
738 regs
->msr
= MSR_USER64
;
742 regs
->msr
= MSR_USER32
;
746 discard_lazy_cpu_state();
748 current
->thread
.used_vsr
= 0;
750 memset(current
->thread
.fpr
, 0, sizeof(current
->thread
.fpr
));
751 current
->thread
.fpscr
.val
= 0;
752 #ifdef CONFIG_ALTIVEC
753 memset(current
->thread
.vr
, 0, sizeof(current
->thread
.vr
));
754 memset(¤t
->thread
.vscr
, 0, sizeof(current
->thread
.vscr
));
755 current
->thread
.vscr
.u
[3] = 0x00010000; /* Java mode disabled */
756 current
->thread
.vrsave
= 0;
757 current
->thread
.used_vr
= 0;
758 #endif /* CONFIG_ALTIVEC */
760 memset(current
->thread
.evr
, 0, sizeof(current
->thread
.evr
));
761 current
->thread
.acc
= 0;
762 current
->thread
.spefscr
= 0;
763 current
->thread
.used_spe
= 0;
764 #endif /* CONFIG_SPE */
767 #define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \
768 | PR_FP_EXC_RES | PR_FP_EXC_INV)
770 int set_fpexc_mode(struct task_struct
*tsk
, unsigned int val
)
772 struct pt_regs
*regs
= tsk
->thread
.regs
;
774 /* This is a bit hairy. If we are an SPE enabled processor
775 * (have embedded fp) we store the IEEE exception enable flags in
776 * fpexc_mode. fpexc_mode is also used for setting FP exception
777 * mode (asyn, precise, disabled) for 'Classic' FP. */
778 if (val
& PR_FP_EXC_SW_ENABLE
) {
780 if (cpu_has_feature(CPU_FTR_SPE
)) {
781 tsk
->thread
.fpexc_mode
= val
&
782 (PR_FP_EXC_SW_ENABLE
| PR_FP_ALL_EXCEPT
);
792 /* on a CONFIG_SPE this does not hurt us. The bits that
793 * __pack_fe01 use do not overlap with bits used for
794 * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits
795 * on CONFIG_SPE implementations are reserved so writing to
796 * them does not change anything */
797 if (val
> PR_FP_EXC_PRECISE
)
799 tsk
->thread
.fpexc_mode
= __pack_fe01(val
);
800 if (regs
!= NULL
&& (regs
->msr
& MSR_FP
) != 0)
801 regs
->msr
= (regs
->msr
& ~(MSR_FE0
|MSR_FE1
))
802 | tsk
->thread
.fpexc_mode
;
806 int get_fpexc_mode(struct task_struct
*tsk
, unsigned long adr
)
810 if (tsk
->thread
.fpexc_mode
& PR_FP_EXC_SW_ENABLE
)
812 if (cpu_has_feature(CPU_FTR_SPE
))
813 val
= tsk
->thread
.fpexc_mode
;
820 val
= __unpack_fe01(tsk
->thread
.fpexc_mode
);
821 return put_user(val
, (unsigned int __user
*) adr
);
824 int set_endian(struct task_struct
*tsk
, unsigned int val
)
826 struct pt_regs
*regs
= tsk
->thread
.regs
;
828 if ((val
== PR_ENDIAN_LITTLE
&& !cpu_has_feature(CPU_FTR_REAL_LE
)) ||
829 (val
== PR_ENDIAN_PPC_LITTLE
&& !cpu_has_feature(CPU_FTR_PPC_LE
)))
835 if (val
== PR_ENDIAN_BIG
)
836 regs
->msr
&= ~MSR_LE
;
837 else if (val
== PR_ENDIAN_LITTLE
|| val
== PR_ENDIAN_PPC_LITTLE
)
845 int get_endian(struct task_struct
*tsk
, unsigned long adr
)
847 struct pt_regs
*regs
= tsk
->thread
.regs
;
850 if (!cpu_has_feature(CPU_FTR_PPC_LE
) &&
851 !cpu_has_feature(CPU_FTR_REAL_LE
))
857 if (regs
->msr
& MSR_LE
) {
858 if (cpu_has_feature(CPU_FTR_REAL_LE
))
859 val
= PR_ENDIAN_LITTLE
;
861 val
= PR_ENDIAN_PPC_LITTLE
;
865 return put_user(val
, (unsigned int __user
*)adr
);
868 int set_unalign_ctl(struct task_struct
*tsk
, unsigned int val
)
870 tsk
->thread
.align_ctl
= val
;
874 int get_unalign_ctl(struct task_struct
*tsk
, unsigned long adr
)
876 return put_user(tsk
->thread
.align_ctl
, (unsigned int __user
*)adr
);
879 #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff))
881 int sys_clone(unsigned long clone_flags
, unsigned long usp
,
882 int __user
*parent_tidp
, void __user
*child_threadptr
,
883 int __user
*child_tidp
, int p6
,
884 struct pt_regs
*regs
)
886 CHECK_FULL_REGS(regs
);
888 usp
= regs
->gpr
[1]; /* stack pointer for child */
890 if (test_thread_flag(TIF_32BIT
)) {
891 parent_tidp
= TRUNC_PTR(parent_tidp
);
892 child_tidp
= TRUNC_PTR(child_tidp
);
895 return do_fork(clone_flags
, usp
, regs
, 0, parent_tidp
, child_tidp
);
898 int sys_fork(unsigned long p1
, unsigned long p2
, unsigned long p3
,
899 unsigned long p4
, unsigned long p5
, unsigned long p6
,
900 struct pt_regs
*regs
)
902 CHECK_FULL_REGS(regs
);
903 return do_fork(SIGCHLD
, regs
->gpr
[1], regs
, 0, NULL
, NULL
);
906 int sys_vfork(unsigned long p1
, unsigned long p2
, unsigned long p3
,
907 unsigned long p4
, unsigned long p5
, unsigned long p6
,
908 struct pt_regs
*regs
)
910 CHECK_FULL_REGS(regs
);
911 return do_fork(CLONE_VFORK
| CLONE_VM
| SIGCHLD
, regs
->gpr
[1],
912 regs
, 0, NULL
, NULL
);
915 int sys_execve(unsigned long a0
, unsigned long a1
, unsigned long a2
,
916 unsigned long a3
, unsigned long a4
, unsigned long a5
,
917 struct pt_regs
*regs
)
922 filename
= getname((char __user
*) a0
);
923 error
= PTR_ERR(filename
);
924 if (IS_ERR(filename
))
926 flush_fp_to_thread(current
);
927 flush_altivec_to_thread(current
);
928 flush_spe_to_thread(current
);
929 error
= do_execve(filename
, (char __user
* __user
*) a1
,
930 (char __user
* __user
*) a2
, regs
);
936 #ifdef CONFIG_IRQSTACKS
937 static inline int valid_irq_stack(unsigned long sp
, struct task_struct
*p
,
938 unsigned long nbytes
)
940 unsigned long stack_page
;
941 unsigned long cpu
= task_cpu(p
);
944 * Avoid crashing if the stack has overflowed and corrupted
945 * task_cpu(p), which is in the thread_info struct.
947 if (cpu
< NR_CPUS
&& cpu_possible(cpu
)) {
948 stack_page
= (unsigned long) hardirq_ctx
[cpu
];
949 if (sp
>= stack_page
+ sizeof(struct thread_struct
)
950 && sp
<= stack_page
+ THREAD_SIZE
- nbytes
)
953 stack_page
= (unsigned long) softirq_ctx
[cpu
];
954 if (sp
>= stack_page
+ sizeof(struct thread_struct
)
955 && sp
<= stack_page
+ THREAD_SIZE
- nbytes
)
962 #define valid_irq_stack(sp, p, nb) 0
963 #endif /* CONFIG_IRQSTACKS */
965 int validate_sp(unsigned long sp
, struct task_struct
*p
,
966 unsigned long nbytes
)
968 unsigned long stack_page
= (unsigned long)task_stack_page(p
);
970 if (sp
>= stack_page
+ sizeof(struct thread_struct
)
971 && sp
<= stack_page
+ THREAD_SIZE
- nbytes
)
974 return valid_irq_stack(sp
, p
, nbytes
);
977 EXPORT_SYMBOL(validate_sp
);
979 unsigned long get_wchan(struct task_struct
*p
)
981 unsigned long ip
, sp
;
984 if (!p
|| p
== current
|| p
->state
== TASK_RUNNING
)
988 if (!validate_sp(sp
, p
, STACK_FRAME_OVERHEAD
))
992 sp
= *(unsigned long *)sp
;
993 if (!validate_sp(sp
, p
, STACK_FRAME_OVERHEAD
))
996 ip
= ((unsigned long *)sp
)[STACK_FRAME_LR_SAVE
];
997 if (!in_sched_functions(ip
))
1000 } while (count
++ < 16);
1004 static int kstack_depth_to_print
= CONFIG_PRINT_STACK_DEPTH
;
1006 void show_stack(struct task_struct
*tsk
, unsigned long *stack
)
1008 unsigned long sp
, ip
, lr
, newsp
;
1012 sp
= (unsigned long) stack
;
1017 asm("mr %0,1" : "=r" (sp
));
1019 sp
= tsk
->thread
.ksp
;
1023 printk("Call Trace:\n");
1025 if (!validate_sp(sp
, tsk
, STACK_FRAME_OVERHEAD
))
1028 stack
= (unsigned long *) sp
;
1030 ip
= stack
[STACK_FRAME_LR_SAVE
];
1031 if (!firstframe
|| ip
!= lr
) {
1032 printk("["REG
"] ["REG
"] %pS", sp
, ip
, (void *)ip
);
1034 printk(" (unreliable)");
1040 * See if this is an exception frame.
1041 * We look for the "regshere" marker in the current frame.
1043 if (validate_sp(sp
, tsk
, STACK_INT_FRAME_SIZE
)
1044 && stack
[STACK_FRAME_MARKER
] == STACK_FRAME_REGS_MARKER
) {
1045 struct pt_regs
*regs
= (struct pt_regs
*)
1046 (sp
+ STACK_FRAME_OVERHEAD
);
1048 printk("--- Exception: %lx at %pS\n LR = %pS\n",
1049 regs
->trap
, (void *)regs
->nip
, (void *)lr
);
1054 } while (count
++ < kstack_depth_to_print
);
1057 void dump_stack(void)
1059 show_stack(current
, NULL
);
1061 EXPORT_SYMBOL(dump_stack
);
1064 void ppc64_runlatch_on(void)
1068 if (cpu_has_feature(CPU_FTR_CTRL
) && !test_thread_flag(TIF_RUNLATCH
)) {
1071 ctrl
= mfspr(SPRN_CTRLF
);
1072 ctrl
|= CTRL_RUNLATCH
;
1073 mtspr(SPRN_CTRLT
, ctrl
);
1075 set_thread_flag(TIF_RUNLATCH
);
1079 void ppc64_runlatch_off(void)
1083 if (cpu_has_feature(CPU_FTR_CTRL
) && test_thread_flag(TIF_RUNLATCH
)) {
1086 clear_thread_flag(TIF_RUNLATCH
);
1088 ctrl
= mfspr(SPRN_CTRLF
);
1089 ctrl
&= ~CTRL_RUNLATCH
;
1090 mtspr(SPRN_CTRLT
, ctrl
);
1095 #if THREAD_SHIFT < PAGE_SHIFT
1097 static struct kmem_cache
*thread_info_cache
;
1099 struct thread_info
*alloc_thread_info(struct task_struct
*tsk
)
1101 struct thread_info
*ti
;
1103 ti
= kmem_cache_alloc(thread_info_cache
, GFP_KERNEL
);
1104 if (unlikely(ti
== NULL
))
1106 #ifdef CONFIG_DEBUG_STACK_USAGE
1107 memset(ti
, 0, THREAD_SIZE
);
1112 void free_thread_info(struct thread_info
*ti
)
1114 kmem_cache_free(thread_info_cache
, ti
);
1117 void thread_info_cache_init(void)
1119 thread_info_cache
= kmem_cache_create("thread_info", THREAD_SIZE
,
1120 THREAD_SIZE
, 0, NULL
);
1121 BUG_ON(thread_info_cache
== NULL
);
1124 #endif /* THREAD_SHIFT < PAGE_SHIFT */
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