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>
37 #include <asm/pgtable.h>
38 #include <asm/uaccess.h>
39 #include <asm/system.h>
41 #include <asm/processor.h>
44 #include <asm/machdep.h>
46 #include <asm/syscalls.h>
48 #include <asm/firmware.h>
51 extern unsigned long _get_SP(void);
54 struct task_struct
*last_task_used_math
= NULL
;
55 struct task_struct
*last_task_used_altivec
= NULL
;
56 struct task_struct
*last_task_used_vsx
= NULL
;
57 struct task_struct
*last_task_used_spe
= NULL
;
61 * Make sure the floating-point register state in the
62 * the thread_struct is up to date for task tsk.
64 void flush_fp_to_thread(struct task_struct
*tsk
)
66 if (tsk
->thread
.regs
) {
68 * We need to disable preemption here because if we didn't,
69 * another process could get scheduled after the regs->msr
70 * test but before we have finished saving the FP registers
71 * to the thread_struct. That process could take over the
72 * FPU, and then when we get scheduled again we would store
73 * bogus values for the remaining FP registers.
76 if (tsk
->thread
.regs
->msr
& MSR_FP
) {
79 * This should only ever be called for current or
80 * for a stopped child process. Since we save away
81 * the FP register state on context switch on SMP,
82 * there is something wrong if a stopped child appears
83 * to still have its FP state in the CPU registers.
85 BUG_ON(tsk
!= current
);
93 void enable_kernel_fp(void)
95 WARN_ON(preemptible());
98 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_FP
))
101 giveup_fpu(NULL
); /* just enables FP for kernel */
103 giveup_fpu(last_task_used_math
);
104 #endif /* CONFIG_SMP */
106 EXPORT_SYMBOL(enable_kernel_fp
);
108 #ifdef CONFIG_ALTIVEC
109 void enable_kernel_altivec(void)
111 WARN_ON(preemptible());
114 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_VEC
))
115 giveup_altivec(current
);
117 giveup_altivec(NULL
); /* just enable AltiVec for kernel - force */
119 giveup_altivec(last_task_used_altivec
);
120 #endif /* CONFIG_SMP */
122 EXPORT_SYMBOL(enable_kernel_altivec
);
125 * Make sure the VMX/Altivec register state in the
126 * the thread_struct is up to date for task tsk.
128 void flush_altivec_to_thread(struct task_struct
*tsk
)
130 if (tsk
->thread
.regs
) {
132 if (tsk
->thread
.regs
->msr
& MSR_VEC
) {
134 BUG_ON(tsk
!= current
);
141 #endif /* CONFIG_ALTIVEC */
145 /* not currently used, but some crazy RAID module might want to later */
146 void enable_kernel_vsx(void)
148 WARN_ON(preemptible());
151 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_VSX
))
154 giveup_vsx(NULL
); /* just enable vsx for kernel - force */
156 giveup_vsx(last_task_used_vsx
);
157 #endif /* CONFIG_SMP */
159 EXPORT_SYMBOL(enable_kernel_vsx
);
162 void flush_vsx_to_thread(struct task_struct
*tsk
)
164 if (tsk
->thread
.regs
) {
166 if (tsk
->thread
.regs
->msr
& MSR_VSX
) {
168 BUG_ON(tsk
!= current
);
175 #endif /* CONFIG_VSX */
179 void enable_kernel_spe(void)
181 WARN_ON(preemptible());
184 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_SPE
))
187 giveup_spe(NULL
); /* just enable SPE for kernel - force */
189 giveup_spe(last_task_used_spe
);
190 #endif /* __SMP __ */
192 EXPORT_SYMBOL(enable_kernel_spe
);
194 void flush_spe_to_thread(struct task_struct
*tsk
)
196 if (tsk
->thread
.regs
) {
198 if (tsk
->thread
.regs
->msr
& MSR_SPE
) {
200 BUG_ON(tsk
!= current
);
207 #endif /* CONFIG_SPE */
211 * If we are doing lazy switching of CPU state (FP, altivec or SPE),
212 * and the current task has some state, discard it.
214 void discard_lazy_cpu_state(void)
217 if (last_task_used_math
== current
)
218 last_task_used_math
= NULL
;
219 #ifdef CONFIG_ALTIVEC
220 if (last_task_used_altivec
== current
)
221 last_task_used_altivec
= NULL
;
222 #endif /* CONFIG_ALTIVEC */
224 if (last_task_used_vsx
== current
)
225 last_task_used_vsx
= NULL
;
226 #endif /* CONFIG_VSX */
228 if (last_task_used_spe
== current
)
229 last_task_used_spe
= NULL
;
233 #endif /* CONFIG_SMP */
235 static DEFINE_PER_CPU(unsigned long, current_dabr
);
237 int set_dabr(unsigned long dabr
)
239 __get_cpu_var(current_dabr
) = dabr
;
241 #ifdef CONFIG_PPC_MERGE /* XXX for now */
243 return ppc_md
.set_dabr(dabr
);
246 /* XXX should we have a CPU_FTR_HAS_DABR ? */
247 #if defined(CONFIG_PPC64) || defined(CONFIG_6xx)
248 mtspr(SPRN_DABR
, dabr
);
254 DEFINE_PER_CPU(struct cpu_usage
, cpu_usage_array
);
257 struct task_struct
*__switch_to(struct task_struct
*prev
,
258 struct task_struct
*new)
260 struct thread_struct
*new_thread
, *old_thread
;
262 struct task_struct
*last
;
265 /* avoid complexity of lazy save/restore of fpu
266 * by just saving it every time we switch out if
267 * this task used the fpu during the last quantum.
269 * If it tries to use the fpu again, it'll trap and
270 * reload its fp regs. So we don't have to do a restore
271 * every switch, just a save.
274 if (prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_FP
))
276 #ifdef CONFIG_ALTIVEC
278 * If the previous thread used altivec in the last quantum
279 * (thus changing altivec regs) then save them.
280 * We used to check the VRSAVE register but not all apps
281 * set it, so we don't rely on it now (and in fact we need
282 * to save & restore VSCR even if VRSAVE == 0). -- paulus
284 * On SMP we always save/restore altivec regs just to avoid the
285 * complexity of changing processors.
288 if (prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_VEC
))
289 giveup_altivec(prev
);
290 #endif /* CONFIG_ALTIVEC */
292 if (prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_VSX
))
294 #endif /* CONFIG_VSX */
297 * If the previous thread used spe in the last quantum
298 * (thus changing spe regs) then save them.
300 * On SMP we always save/restore spe regs just to avoid the
301 * complexity of changing processors.
303 if ((prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_SPE
)))
305 #endif /* CONFIG_SPE */
307 #else /* CONFIG_SMP */
308 #ifdef CONFIG_ALTIVEC
309 /* Avoid the trap. On smp this this never happens since
310 * we don't set last_task_used_altivec -- Cort
312 if (new->thread
.regs
&& last_task_used_altivec
== new)
313 new->thread
.regs
->msr
|= MSR_VEC
;
314 #endif /* CONFIG_ALTIVEC */
316 if (new->thread
.regs
&& last_task_used_vsx
== new)
317 new->thread
.regs
->msr
|= MSR_VSX
;
318 #endif /* CONFIG_VSX */
320 /* Avoid the trap. On smp this this never happens since
321 * we don't set last_task_used_spe
323 if (new->thread
.regs
&& last_task_used_spe
== new)
324 new->thread
.regs
->msr
|= MSR_SPE
;
325 #endif /* CONFIG_SPE */
327 #endif /* CONFIG_SMP */
329 if (unlikely(__get_cpu_var(current_dabr
) != new->thread
.dabr
))
330 set_dabr(new->thread
.dabr
);
332 new_thread
= &new->thread
;
333 old_thread
= ¤t
->thread
;
337 * Collect processor utilization data per process
339 if (firmware_has_feature(FW_FEATURE_SPLPAR
)) {
340 struct cpu_usage
*cu
= &__get_cpu_var(cpu_usage_array
);
341 long unsigned start_tb
, current_tb
;
342 start_tb
= old_thread
->start_tb
;
343 cu
->current_tb
= current_tb
= mfspr(SPRN_PURR
);
344 old_thread
->accum_tb
+= (current_tb
- start_tb
);
345 new_thread
->start_tb
= current_tb
;
349 local_irq_save(flags
);
351 account_system_vtime(current
);
352 account_process_vtime(current
);
353 calculate_steal_time();
356 * We can't take a PMU exception inside _switch() since there is a
357 * window where the kernel stack SLB and the kernel stack are out
358 * of sync. Hard disable here.
361 last
= _switch(old_thread
, new_thread
);
363 local_irq_restore(flags
);
368 static int instructions_to_print
= 16;
370 static void show_instructions(struct pt_regs
*regs
)
373 unsigned long pc
= regs
->nip
- (instructions_to_print
* 3 / 4 *
376 printk("Instruction dump:");
378 for (i
= 0; i
< instructions_to_print
; i
++) {
384 #if !defined(CONFIG_BOOKE)
385 /* If executing with the IMMU off, adjust pc rather
386 * than print XXXXXXXX.
388 if (!(regs
->msr
& MSR_IR
))
389 pc
= (unsigned long)phys_to_virt(pc
);
392 /* We use __get_user here *only* to avoid an OOPS on a
393 * bad address because the pc *should* only be a
396 if (!__kernel_text_address(pc
) ||
397 __get_user(instr
, (unsigned int __user
*)pc
)) {
401 printk("<%08x> ", instr
);
403 printk("%08x ", instr
);
412 static struct regbit
{
427 static void printbits(unsigned long val
, struct regbit
*bits
)
429 const char *sep
= "";
432 for (; bits
->bit
; ++bits
)
433 if (val
& bits
->bit
) {
434 printk("%s%s", sep
, bits
->name
);
442 #define REGS_PER_LINE 4
443 #define LAST_VOLATILE 13
446 #define REGS_PER_LINE 8
447 #define LAST_VOLATILE 12
450 void show_regs(struct pt_regs
* regs
)
454 printk("NIP: "REG
" LR: "REG
" CTR: "REG
"\n",
455 regs
->nip
, regs
->link
, regs
->ctr
);
456 printk("REGS: %p TRAP: %04lx %s (%s)\n",
457 regs
, regs
->trap
, print_tainted(), init_utsname()->release
);
458 printk("MSR: "REG
" ", regs
->msr
);
459 printbits(regs
->msr
, msr_bits
);
460 printk(" CR: %08lx XER: %08lx\n", regs
->ccr
, regs
->xer
);
462 if (trap
== 0x300 || trap
== 0x600)
463 #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
464 printk("DEAR: "REG
", ESR: "REG
"\n", regs
->dar
, regs
->dsisr
);
466 printk("DAR: "REG
", DSISR: "REG
"\n", regs
->dar
, regs
->dsisr
);
468 printk("TASK = %p[%d] '%s' THREAD: %p",
469 current
, task_pid_nr(current
), current
->comm
, task_thread_info(current
));
472 printk(" CPU: %d", raw_smp_processor_id());
473 #endif /* CONFIG_SMP */
475 for (i
= 0; i
< 32; i
++) {
476 if ((i
% REGS_PER_LINE
) == 0)
477 printk("\n" KERN_INFO
"GPR%02d: ", i
);
478 printk(REG
" ", regs
->gpr
[i
]);
479 if (i
== LAST_VOLATILE
&& !FULL_REGS(regs
))
483 #ifdef CONFIG_KALLSYMS
485 * Lookup NIP late so we have the best change of getting the
486 * above info out without failing
488 printk("NIP ["REG
"] ", regs
->nip
);
489 print_symbol("%s\n", regs
->nip
);
490 printk("LR ["REG
"] ", regs
->link
);
491 print_symbol("%s\n", regs
->link
);
493 show_stack(current
, (unsigned long *) regs
->gpr
[1]);
494 if (!user_mode(regs
))
495 show_instructions(regs
);
498 void exit_thread(void)
500 discard_lazy_cpu_state();
503 void flush_thread(void)
506 struct thread_info
*t
= current_thread_info();
508 if (test_ti_thread_flag(t
, TIF_ABI_PENDING
)) {
509 clear_ti_thread_flag(t
, TIF_ABI_PENDING
);
510 if (test_ti_thread_flag(t
, TIF_32BIT
))
511 clear_ti_thread_flag(t
, TIF_32BIT
);
513 set_ti_thread_flag(t
, TIF_32BIT
);
517 discard_lazy_cpu_state();
519 if (current
->thread
.dabr
) {
520 current
->thread
.dabr
= 0;
526 release_thread(struct task_struct
*t
)
531 * This gets called before we allocate a new thread and copy
532 * the current task into it.
534 void prepare_to_copy(struct task_struct
*tsk
)
536 flush_fp_to_thread(current
);
537 flush_altivec_to_thread(current
);
538 flush_vsx_to_thread(current
);
539 flush_spe_to_thread(current
);
545 int copy_thread(int nr
, unsigned long clone_flags
, unsigned long usp
,
546 unsigned long unused
, struct task_struct
*p
,
547 struct pt_regs
*regs
)
549 struct pt_regs
*childregs
, *kregs
;
550 extern void ret_from_fork(void);
551 unsigned long sp
= (unsigned long)task_stack_page(p
) + THREAD_SIZE
;
553 CHECK_FULL_REGS(regs
);
555 sp
-= sizeof(struct pt_regs
);
556 childregs
= (struct pt_regs
*) sp
;
558 if ((childregs
->msr
& MSR_PR
) == 0) {
559 /* for kernel thread, set `current' and stackptr in new task */
560 childregs
->gpr
[1] = sp
+ sizeof(struct pt_regs
);
562 childregs
->gpr
[2] = (unsigned long) p
;
564 clear_tsk_thread_flag(p
, TIF_32BIT
);
566 p
->thread
.regs
= NULL
; /* no user register state */
568 childregs
->gpr
[1] = usp
;
569 p
->thread
.regs
= childregs
;
570 if (clone_flags
& CLONE_SETTLS
) {
572 if (!test_thread_flag(TIF_32BIT
))
573 childregs
->gpr
[13] = childregs
->gpr
[6];
576 childregs
->gpr
[2] = childregs
->gpr
[6];
579 childregs
->gpr
[3] = 0; /* Result from fork() */
580 sp
-= STACK_FRAME_OVERHEAD
;
583 * The way this works is that at some point in the future
584 * some task will call _switch to switch to the new task.
585 * That will pop off the stack frame created below and start
586 * the new task running at ret_from_fork. The new task will
587 * do some house keeping and then return from the fork or clone
588 * system call, using the stack frame created above.
590 sp
-= sizeof(struct pt_regs
);
591 kregs
= (struct pt_regs
*) sp
;
592 sp
-= STACK_FRAME_OVERHEAD
;
594 p
->thread
.ksp_limit
= (unsigned long)task_stack_page(p
) +
595 _ALIGN_UP(sizeof(struct thread_info
), 16);
598 if (cpu_has_feature(CPU_FTR_SLB
)) {
599 unsigned long sp_vsid
;
600 unsigned long llp
= mmu_psize_defs
[mmu_linear_psize
].sllp
;
602 if (cpu_has_feature(CPU_FTR_1T_SEGMENT
))
603 sp_vsid
= get_kernel_vsid(sp
, MMU_SEGSIZE_1T
)
604 << SLB_VSID_SHIFT_1T
;
606 sp_vsid
= get_kernel_vsid(sp
, MMU_SEGSIZE_256M
)
608 sp_vsid
|= SLB_VSID_KERNEL
| llp
;
609 p
->thread
.ksp_vsid
= sp_vsid
;
613 * The PPC64 ABI makes use of a TOC to contain function
614 * pointers. The function (ret_from_except) is actually a pointer
615 * to the TOC entry. The first entry is a pointer to the actual
618 kregs
->nip
= *((unsigned long *)ret_from_fork
);
620 kregs
->nip
= (unsigned long)ret_from_fork
;
627 * Set up a thread for executing a new program
629 void start_thread(struct pt_regs
*regs
, unsigned long start
, unsigned long sp
)
632 unsigned long load_addr
= regs
->gpr
[2]; /* saved by ELF_PLAT_INIT */
638 * If we exec out of a kernel thread then thread.regs will not be
641 if (!current
->thread
.regs
) {
642 struct pt_regs
*regs
= task_stack_page(current
) + THREAD_SIZE
;
643 current
->thread
.regs
= regs
- 1;
646 memset(regs
->gpr
, 0, sizeof(regs
->gpr
));
654 * We have just cleared all the nonvolatile GPRs, so make
655 * FULL_REGS(regs) return true. This is necessary to allow
656 * ptrace to examine the thread immediately after exec.
663 regs
->msr
= MSR_USER
;
665 if (!test_thread_flag(TIF_32BIT
)) {
666 unsigned long entry
, toc
;
668 /* start is a relocated pointer to the function descriptor for
669 * the elf _start routine. The first entry in the function
670 * descriptor is the entry address of _start and the second
671 * entry is the TOC value we need to use.
673 __get_user(entry
, (unsigned long __user
*)start
);
674 __get_user(toc
, (unsigned long __user
*)start
+1);
676 /* Check whether the e_entry function descriptor entries
677 * need to be relocated before we can use them.
679 if (load_addr
!= 0) {
685 regs
->msr
= MSR_USER64
;
689 regs
->msr
= MSR_USER32
;
693 discard_lazy_cpu_state();
695 current
->thread
.used_vsr
= 0;
697 memset(current
->thread
.fpr
, 0, sizeof(current
->thread
.fpr
));
698 current
->thread
.fpscr
.val
= 0;
699 #ifdef CONFIG_ALTIVEC
700 memset(current
->thread
.vr
, 0, sizeof(current
->thread
.vr
));
701 memset(¤t
->thread
.vscr
, 0, sizeof(current
->thread
.vscr
));
702 current
->thread
.vscr
.u
[3] = 0x00010000; /* Java mode disabled */
703 current
->thread
.vrsave
= 0;
704 current
->thread
.used_vr
= 0;
705 #endif /* CONFIG_ALTIVEC */
707 memset(current
->thread
.evr
, 0, sizeof(current
->thread
.evr
));
708 current
->thread
.acc
= 0;
709 current
->thread
.spefscr
= 0;
710 current
->thread
.used_spe
= 0;
711 #endif /* CONFIG_SPE */
714 #define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \
715 | PR_FP_EXC_RES | PR_FP_EXC_INV)
717 int set_fpexc_mode(struct task_struct
*tsk
, unsigned int val
)
719 struct pt_regs
*regs
= tsk
->thread
.regs
;
721 /* This is a bit hairy. If we are an SPE enabled processor
722 * (have embedded fp) we store the IEEE exception enable flags in
723 * fpexc_mode. fpexc_mode is also used for setting FP exception
724 * mode (asyn, precise, disabled) for 'Classic' FP. */
725 if (val
& PR_FP_EXC_SW_ENABLE
) {
727 if (cpu_has_feature(CPU_FTR_SPE
)) {
728 tsk
->thread
.fpexc_mode
= val
&
729 (PR_FP_EXC_SW_ENABLE
| PR_FP_ALL_EXCEPT
);
739 /* on a CONFIG_SPE this does not hurt us. The bits that
740 * __pack_fe01 use do not overlap with bits used for
741 * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits
742 * on CONFIG_SPE implementations are reserved so writing to
743 * them does not change anything */
744 if (val
> PR_FP_EXC_PRECISE
)
746 tsk
->thread
.fpexc_mode
= __pack_fe01(val
);
747 if (regs
!= NULL
&& (regs
->msr
& MSR_FP
) != 0)
748 regs
->msr
= (regs
->msr
& ~(MSR_FE0
|MSR_FE1
))
749 | tsk
->thread
.fpexc_mode
;
753 int get_fpexc_mode(struct task_struct
*tsk
, unsigned long adr
)
757 if (tsk
->thread
.fpexc_mode
& PR_FP_EXC_SW_ENABLE
)
759 if (cpu_has_feature(CPU_FTR_SPE
))
760 val
= tsk
->thread
.fpexc_mode
;
767 val
= __unpack_fe01(tsk
->thread
.fpexc_mode
);
768 return put_user(val
, (unsigned int __user
*) adr
);
771 int set_endian(struct task_struct
*tsk
, unsigned int val
)
773 struct pt_regs
*regs
= tsk
->thread
.regs
;
775 if ((val
== PR_ENDIAN_LITTLE
&& !cpu_has_feature(CPU_FTR_REAL_LE
)) ||
776 (val
== PR_ENDIAN_PPC_LITTLE
&& !cpu_has_feature(CPU_FTR_PPC_LE
)))
782 if (val
== PR_ENDIAN_BIG
)
783 regs
->msr
&= ~MSR_LE
;
784 else if (val
== PR_ENDIAN_LITTLE
|| val
== PR_ENDIAN_PPC_LITTLE
)
792 int get_endian(struct task_struct
*tsk
, unsigned long adr
)
794 struct pt_regs
*regs
= tsk
->thread
.regs
;
797 if (!cpu_has_feature(CPU_FTR_PPC_LE
) &&
798 !cpu_has_feature(CPU_FTR_REAL_LE
))
804 if (regs
->msr
& MSR_LE
) {
805 if (cpu_has_feature(CPU_FTR_REAL_LE
))
806 val
= PR_ENDIAN_LITTLE
;
808 val
= PR_ENDIAN_PPC_LITTLE
;
812 return put_user(val
, (unsigned int __user
*)adr
);
815 int set_unalign_ctl(struct task_struct
*tsk
, unsigned int val
)
817 tsk
->thread
.align_ctl
= val
;
821 int get_unalign_ctl(struct task_struct
*tsk
, unsigned long adr
)
823 return put_user(tsk
->thread
.align_ctl
, (unsigned int __user
*)adr
);
826 #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff))
828 int sys_clone(unsigned long clone_flags
, unsigned long usp
,
829 int __user
*parent_tidp
, void __user
*child_threadptr
,
830 int __user
*child_tidp
, int p6
,
831 struct pt_regs
*regs
)
833 CHECK_FULL_REGS(regs
);
835 usp
= regs
->gpr
[1]; /* stack pointer for child */
837 if (test_thread_flag(TIF_32BIT
)) {
838 parent_tidp
= TRUNC_PTR(parent_tidp
);
839 child_tidp
= TRUNC_PTR(child_tidp
);
842 return do_fork(clone_flags
, usp
, regs
, 0, parent_tidp
, child_tidp
);
845 int sys_fork(unsigned long p1
, unsigned long p2
, unsigned long p3
,
846 unsigned long p4
, unsigned long p5
, unsigned long p6
,
847 struct pt_regs
*regs
)
849 CHECK_FULL_REGS(regs
);
850 return do_fork(SIGCHLD
, regs
->gpr
[1], regs
, 0, NULL
, NULL
);
853 int sys_vfork(unsigned long p1
, unsigned long p2
, unsigned long p3
,
854 unsigned long p4
, unsigned long p5
, unsigned long p6
,
855 struct pt_regs
*regs
)
857 CHECK_FULL_REGS(regs
);
858 return do_fork(CLONE_VFORK
| CLONE_VM
| SIGCHLD
, regs
->gpr
[1],
859 regs
, 0, NULL
, NULL
);
862 int sys_execve(unsigned long a0
, unsigned long a1
, unsigned long a2
,
863 unsigned long a3
, unsigned long a4
, unsigned long a5
,
864 struct pt_regs
*regs
)
869 filename
= getname((char __user
*) a0
);
870 error
= PTR_ERR(filename
);
871 if (IS_ERR(filename
))
873 flush_fp_to_thread(current
);
874 flush_altivec_to_thread(current
);
875 flush_spe_to_thread(current
);
876 error
= do_execve(filename
, (char __user
* __user
*) a1
,
877 (char __user
* __user
*) a2
, regs
);
883 #ifdef CONFIG_IRQSTACKS
884 static inline int valid_irq_stack(unsigned long sp
, struct task_struct
*p
,
885 unsigned long nbytes
)
887 unsigned long stack_page
;
888 unsigned long cpu
= task_cpu(p
);
891 * Avoid crashing if the stack has overflowed and corrupted
892 * task_cpu(p), which is in the thread_info struct.
894 if (cpu
< NR_CPUS
&& cpu_possible(cpu
)) {
895 stack_page
= (unsigned long) hardirq_ctx
[cpu
];
896 if (sp
>= stack_page
+ sizeof(struct thread_struct
)
897 && sp
<= stack_page
+ THREAD_SIZE
- nbytes
)
900 stack_page
= (unsigned long) softirq_ctx
[cpu
];
901 if (sp
>= stack_page
+ sizeof(struct thread_struct
)
902 && sp
<= stack_page
+ THREAD_SIZE
- nbytes
)
909 #define valid_irq_stack(sp, p, nb) 0
910 #endif /* CONFIG_IRQSTACKS */
912 int validate_sp(unsigned long sp
, struct task_struct
*p
,
913 unsigned long nbytes
)
915 unsigned long stack_page
= (unsigned long)task_stack_page(p
);
917 if (sp
>= stack_page
+ sizeof(struct thread_struct
)
918 && sp
<= stack_page
+ THREAD_SIZE
- nbytes
)
921 return valid_irq_stack(sp
, p
, nbytes
);
924 EXPORT_SYMBOL(validate_sp
);
926 unsigned long get_wchan(struct task_struct
*p
)
928 unsigned long ip
, sp
;
931 if (!p
|| p
== current
|| p
->state
== TASK_RUNNING
)
935 if (!validate_sp(sp
, p
, STACK_FRAME_OVERHEAD
))
939 sp
= *(unsigned long *)sp
;
940 if (!validate_sp(sp
, p
, STACK_FRAME_OVERHEAD
))
943 ip
= ((unsigned long *)sp
)[STACK_FRAME_LR_SAVE
];
944 if (!in_sched_functions(ip
))
947 } while (count
++ < 16);
951 static int kstack_depth_to_print
= 64;
953 void show_stack(struct task_struct
*tsk
, unsigned long *stack
)
955 unsigned long sp
, ip
, lr
, newsp
;
959 sp
= (unsigned long) stack
;
964 asm("mr %0,1" : "=r" (sp
));
966 sp
= tsk
->thread
.ksp
;
970 printk("Call Trace:\n");
972 if (!validate_sp(sp
, tsk
, STACK_FRAME_OVERHEAD
))
975 stack
= (unsigned long *) sp
;
977 ip
= stack
[STACK_FRAME_LR_SAVE
];
978 if (!firstframe
|| ip
!= lr
) {
979 printk("["REG
"] ["REG
"] ", sp
, ip
);
980 print_symbol("%s", ip
);
982 printk(" (unreliable)");
988 * See if this is an exception frame.
989 * We look for the "regshere" marker in the current frame.
991 if (validate_sp(sp
, tsk
, STACK_INT_FRAME_SIZE
)
992 && stack
[STACK_FRAME_MARKER
] == STACK_FRAME_REGS_MARKER
) {
993 struct pt_regs
*regs
= (struct pt_regs
*)
994 (sp
+ STACK_FRAME_OVERHEAD
);
995 printk("--- Exception: %lx", regs
->trap
);
996 print_symbol(" at %s\n", regs
->nip
);
998 print_symbol(" LR = %s\n", lr
);
1003 } while (count
++ < kstack_depth_to_print
);
1006 void dump_stack(void)
1008 show_stack(current
, NULL
);
1010 EXPORT_SYMBOL(dump_stack
);
1013 void ppc64_runlatch_on(void)
1017 if (cpu_has_feature(CPU_FTR_CTRL
) && !test_thread_flag(TIF_RUNLATCH
)) {
1020 ctrl
= mfspr(SPRN_CTRLF
);
1021 ctrl
|= CTRL_RUNLATCH
;
1022 mtspr(SPRN_CTRLT
, ctrl
);
1024 set_thread_flag(TIF_RUNLATCH
);
1028 void ppc64_runlatch_off(void)
1032 if (cpu_has_feature(CPU_FTR_CTRL
) && test_thread_flag(TIF_RUNLATCH
)) {
1035 clear_thread_flag(TIF_RUNLATCH
);
1037 ctrl
= mfspr(SPRN_CTRLF
);
1038 ctrl
&= ~CTRL_RUNLATCH
;
1039 mtspr(SPRN_CTRLT
, ctrl
);
1044 #if THREAD_SHIFT < PAGE_SHIFT
1046 static struct kmem_cache
*thread_info_cache
;
1048 struct thread_info
*alloc_thread_info(struct task_struct
*tsk
)
1050 struct thread_info
*ti
;
1052 ti
= kmem_cache_alloc(thread_info_cache
, GFP_KERNEL
);
1053 if (unlikely(ti
== NULL
))
1055 #ifdef CONFIG_DEBUG_STACK_USAGE
1056 memset(ti
, 0, THREAD_SIZE
);
1061 void free_thread_info(struct thread_info
*ti
)
1063 kmem_cache_free(thread_info_cache
, ti
);
1066 void thread_info_cache_init(void)
1068 thread_info_cache
= kmem_cache_create("thread_info", THREAD_SIZE
,
1069 THREAD_SIZE
, 0, NULL
);
1070 BUG_ON(thread_info_cache
== NULL
);
1073 #endif /* THREAD_SHIFT < PAGE_SHIFT */
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