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>
50 #include <linux/kprobes.h>
51 #include <linux/kdebug.h>
53 extern unsigned long _get_SP(void);
56 struct task_struct
*last_task_used_math
= NULL
;
57 struct task_struct
*last_task_used_altivec
= NULL
;
58 struct task_struct
*last_task_used_vsx
= NULL
;
59 struct task_struct
*last_task_used_spe
= NULL
;
63 * Make sure the floating-point register state in the
64 * the thread_struct is up to date for task tsk.
66 void flush_fp_to_thread(struct task_struct
*tsk
)
68 if (tsk
->thread
.regs
) {
70 * We need to disable preemption here because if we didn't,
71 * another process could get scheduled after the regs->msr
72 * test but before we have finished saving the FP registers
73 * to the thread_struct. That process could take over the
74 * FPU, and then when we get scheduled again we would store
75 * bogus values for the remaining FP registers.
78 if (tsk
->thread
.regs
->msr
& MSR_FP
) {
81 * This should only ever be called for current or
82 * for a stopped child process. Since we save away
83 * the FP register state on context switch on SMP,
84 * there is something wrong if a stopped child appears
85 * to still have its FP state in the CPU registers.
87 BUG_ON(tsk
!= current
);
95 void enable_kernel_fp(void)
97 WARN_ON(preemptible());
100 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_FP
))
103 giveup_fpu(NULL
); /* just enables FP for kernel */
105 giveup_fpu(last_task_used_math
);
106 #endif /* CONFIG_SMP */
108 EXPORT_SYMBOL(enable_kernel_fp
);
110 #ifdef CONFIG_ALTIVEC
111 void enable_kernel_altivec(void)
113 WARN_ON(preemptible());
116 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_VEC
))
117 giveup_altivec(current
);
119 giveup_altivec(NULL
); /* just enable AltiVec for kernel - force */
121 giveup_altivec(last_task_used_altivec
);
122 #endif /* CONFIG_SMP */
124 EXPORT_SYMBOL(enable_kernel_altivec
);
127 * Make sure the VMX/Altivec register state in the
128 * the thread_struct is up to date for task tsk.
130 void flush_altivec_to_thread(struct task_struct
*tsk
)
132 if (tsk
->thread
.regs
) {
134 if (tsk
->thread
.regs
->msr
& MSR_VEC
) {
136 BUG_ON(tsk
!= current
);
143 #endif /* CONFIG_ALTIVEC */
147 /* not currently used, but some crazy RAID module might want to later */
148 void enable_kernel_vsx(void)
150 WARN_ON(preemptible());
153 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_VSX
))
156 giveup_vsx(NULL
); /* just enable vsx for kernel - force */
158 giveup_vsx(last_task_used_vsx
);
159 #endif /* CONFIG_SMP */
161 EXPORT_SYMBOL(enable_kernel_vsx
);
164 void giveup_vsx(struct task_struct
*tsk
)
171 void flush_vsx_to_thread(struct task_struct
*tsk
)
173 if (tsk
->thread
.regs
) {
175 if (tsk
->thread
.regs
->msr
& MSR_VSX
) {
177 BUG_ON(tsk
!= current
);
184 #endif /* CONFIG_VSX */
188 void enable_kernel_spe(void)
190 WARN_ON(preemptible());
193 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_SPE
))
196 giveup_spe(NULL
); /* just enable SPE for kernel - force */
198 giveup_spe(last_task_used_spe
);
199 #endif /* __SMP __ */
201 EXPORT_SYMBOL(enable_kernel_spe
);
203 void flush_spe_to_thread(struct task_struct
*tsk
)
205 if (tsk
->thread
.regs
) {
207 if (tsk
->thread
.regs
->msr
& MSR_SPE
) {
209 BUG_ON(tsk
!= current
);
216 #endif /* CONFIG_SPE */
220 * If we are doing lazy switching of CPU state (FP, altivec or SPE),
221 * and the current task has some state, discard it.
223 void discard_lazy_cpu_state(void)
226 if (last_task_used_math
== current
)
227 last_task_used_math
= NULL
;
228 #ifdef CONFIG_ALTIVEC
229 if (last_task_used_altivec
== current
)
230 last_task_used_altivec
= NULL
;
231 #endif /* CONFIG_ALTIVEC */
233 if (last_task_used_vsx
== current
)
234 last_task_used_vsx
= NULL
;
235 #endif /* CONFIG_VSX */
237 if (last_task_used_spe
== current
)
238 last_task_used_spe
= NULL
;
242 #endif /* CONFIG_SMP */
244 void do_dabr(struct pt_regs
*regs
, unsigned long address
,
245 unsigned long error_code
)
249 if (notify_die(DIE_DABR_MATCH
, "dabr_match", regs
, error_code
,
250 11, SIGSEGV
) == NOTIFY_STOP
)
253 if (debugger_dabr_match(regs
))
256 /* Clear the DAC and struct entries. One shot trigger */
257 #if defined(CONFIG_BOOKE)
258 mtspr(SPRN_DBCR0
, mfspr(SPRN_DBCR0
) & ~(DBSR_DAC1R
| DBSR_DAC1W
265 /* Deliver the signal to userspace */
266 info
.si_signo
= SIGTRAP
;
268 info
.si_code
= TRAP_HWBKPT
;
269 info
.si_addr
= (void __user
*)address
;
270 force_sig_info(SIGTRAP
, &info
, current
);
273 static DEFINE_PER_CPU(unsigned long, current_dabr
);
275 int set_dabr(unsigned long dabr
)
277 __get_cpu_var(current_dabr
) = dabr
;
280 return ppc_md
.set_dabr(dabr
);
282 /* XXX should we have a CPU_FTR_HAS_DABR ? */
283 #if defined(CONFIG_PPC64) || defined(CONFIG_6xx)
284 mtspr(SPRN_DABR
, dabr
);
287 #if defined(CONFIG_BOOKE)
288 mtspr(SPRN_DAC1
, dabr
);
295 DEFINE_PER_CPU(struct cpu_usage
, cpu_usage_array
);
298 struct task_struct
*__switch_to(struct task_struct
*prev
,
299 struct task_struct
*new)
301 struct thread_struct
*new_thread
, *old_thread
;
303 struct task_struct
*last
;
306 /* avoid complexity of lazy save/restore of fpu
307 * by just saving it every time we switch out if
308 * this task used the fpu during the last quantum.
310 * If it tries to use the fpu again, it'll trap and
311 * reload its fp regs. So we don't have to do a restore
312 * every switch, just a save.
315 if (prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_FP
))
317 #ifdef CONFIG_ALTIVEC
319 * If the previous thread used altivec in the last quantum
320 * (thus changing altivec regs) then save them.
321 * We used to check the VRSAVE register but not all apps
322 * set it, so we don't rely on it now (and in fact we need
323 * to save & restore VSCR even if VRSAVE == 0). -- paulus
325 * On SMP we always save/restore altivec regs just to avoid the
326 * complexity of changing processors.
329 if (prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_VEC
))
330 giveup_altivec(prev
);
331 #endif /* CONFIG_ALTIVEC */
333 if (prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_VSX
))
334 /* VMX and FPU registers are already save here */
336 #endif /* CONFIG_VSX */
339 * If the previous thread used spe in the last quantum
340 * (thus changing spe regs) then save them.
342 * On SMP we always save/restore spe regs just to avoid the
343 * complexity of changing processors.
345 if ((prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_SPE
)))
347 #endif /* CONFIG_SPE */
349 #else /* CONFIG_SMP */
350 #ifdef CONFIG_ALTIVEC
351 /* Avoid the trap. On smp this this never happens since
352 * we don't set last_task_used_altivec -- Cort
354 if (new->thread
.regs
&& last_task_used_altivec
== new)
355 new->thread
.regs
->msr
|= MSR_VEC
;
356 #endif /* CONFIG_ALTIVEC */
358 if (new->thread
.regs
&& last_task_used_vsx
== new)
359 new->thread
.regs
->msr
|= MSR_VSX
;
360 #endif /* CONFIG_VSX */
362 /* Avoid the trap. On smp this this never happens since
363 * we don't set last_task_used_spe
365 if (new->thread
.regs
&& last_task_used_spe
== new)
366 new->thread
.regs
->msr
|= MSR_SPE
;
367 #endif /* CONFIG_SPE */
369 #endif /* CONFIG_SMP */
371 if (unlikely(__get_cpu_var(current_dabr
) != new->thread
.dabr
))
372 set_dabr(new->thread
.dabr
);
374 #if defined(CONFIG_BOOKE)
375 /* If new thread DAC (HW breakpoint) is the same then leave it */
376 if (new->thread
.dabr
)
377 set_dabr(new->thread
.dabr
);
380 new_thread
= &new->thread
;
381 old_thread
= ¤t
->thread
;
385 * Collect processor utilization data per process
387 if (firmware_has_feature(FW_FEATURE_SPLPAR
)) {
388 struct cpu_usage
*cu
= &__get_cpu_var(cpu_usage_array
);
389 long unsigned start_tb
, current_tb
;
390 start_tb
= old_thread
->start_tb
;
391 cu
->current_tb
= current_tb
= mfspr(SPRN_PURR
);
392 old_thread
->accum_tb
+= (current_tb
- start_tb
);
393 new_thread
->start_tb
= current_tb
;
397 local_irq_save(flags
);
399 account_system_vtime(current
);
400 account_process_vtime(current
);
401 calculate_steal_time();
404 * We can't take a PMU exception inside _switch() since there is a
405 * window where the kernel stack SLB and the kernel stack are out
406 * of sync. Hard disable here.
409 last
= _switch(old_thread
, new_thread
);
411 local_irq_restore(flags
);
416 static int instructions_to_print
= 16;
418 static void show_instructions(struct pt_regs
*regs
)
421 unsigned long pc
= regs
->nip
- (instructions_to_print
* 3 / 4 *
424 printk("Instruction dump:");
426 for (i
= 0; i
< instructions_to_print
; i
++) {
432 #if !defined(CONFIG_BOOKE)
433 /* If executing with the IMMU off, adjust pc rather
434 * than print XXXXXXXX.
436 if (!(regs
->msr
& MSR_IR
))
437 pc
= (unsigned long)phys_to_virt(pc
);
440 /* We use __get_user here *only* to avoid an OOPS on a
441 * bad address because the pc *should* only be a
444 if (!__kernel_text_address(pc
) ||
445 __get_user(instr
, (unsigned int __user
*)pc
)) {
449 printk("<%08x> ", instr
);
451 printk("%08x ", instr
);
460 static struct regbit
{
475 static void printbits(unsigned long val
, struct regbit
*bits
)
477 const char *sep
= "";
480 for (; bits
->bit
; ++bits
)
481 if (val
& bits
->bit
) {
482 printk("%s%s", sep
, bits
->name
);
490 #define REGS_PER_LINE 4
491 #define LAST_VOLATILE 13
494 #define REGS_PER_LINE 8
495 #define LAST_VOLATILE 12
498 void show_regs(struct pt_regs
* regs
)
502 printk("NIP: "REG
" LR: "REG
" CTR: "REG
"\n",
503 regs
->nip
, regs
->link
, regs
->ctr
);
504 printk("REGS: %p TRAP: %04lx %s (%s)\n",
505 regs
, regs
->trap
, print_tainted(), init_utsname()->release
);
506 printk("MSR: "REG
" ", regs
->msr
);
507 printbits(regs
->msr
, msr_bits
);
508 printk(" CR: %08lx XER: %08lx\n", regs
->ccr
, regs
->xer
);
510 if (trap
== 0x300 || trap
== 0x600)
511 #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
512 printk("DEAR: "REG
", ESR: "REG
"\n", regs
->dar
, regs
->dsisr
);
514 printk("DAR: "REG
", DSISR: "REG
"\n", regs
->dar
, regs
->dsisr
);
516 printk("TASK = %p[%d] '%s' THREAD: %p",
517 current
, task_pid_nr(current
), current
->comm
, task_thread_info(current
));
520 printk(" CPU: %d", raw_smp_processor_id());
521 #endif /* CONFIG_SMP */
523 for (i
= 0; i
< 32; i
++) {
524 if ((i
% REGS_PER_LINE
) == 0)
525 printk("\n" KERN_INFO
"GPR%02d: ", i
);
526 printk(REG
" ", regs
->gpr
[i
]);
527 if (i
== LAST_VOLATILE
&& !FULL_REGS(regs
))
531 #ifdef CONFIG_KALLSYMS
533 * Lookup NIP late so we have the best change of getting the
534 * above info out without failing
536 printk("NIP ["REG
"] %pS\n", regs
->nip
, (void *)regs
->nip
);
537 printk("LR ["REG
"] %pS\n", regs
->link
, (void *)regs
->link
);
539 show_stack(current
, (unsigned long *) regs
->gpr
[1]);
540 if (!user_mode(regs
))
541 show_instructions(regs
);
544 void exit_thread(void)
546 discard_lazy_cpu_state();
549 void flush_thread(void)
552 struct thread_info
*t
= current_thread_info();
554 if (test_ti_thread_flag(t
, TIF_ABI_PENDING
)) {
555 clear_ti_thread_flag(t
, TIF_ABI_PENDING
);
556 if (test_ti_thread_flag(t
, TIF_32BIT
))
557 clear_ti_thread_flag(t
, TIF_32BIT
);
559 set_ti_thread_flag(t
, TIF_32BIT
);
563 discard_lazy_cpu_state();
565 if (current
->thread
.dabr
) {
566 current
->thread
.dabr
= 0;
569 #if defined(CONFIG_BOOKE)
570 current
->thread
.dbcr0
&= ~(DBSR_DAC1R
| DBSR_DAC1W
);
576 release_thread(struct task_struct
*t
)
581 * This gets called before we allocate a new thread and copy
582 * the current task into it.
584 void prepare_to_copy(struct task_struct
*tsk
)
586 flush_fp_to_thread(current
);
587 flush_altivec_to_thread(current
);
588 flush_vsx_to_thread(current
);
589 flush_spe_to_thread(current
);
595 int copy_thread(int nr
, unsigned long clone_flags
, unsigned long usp
,
596 unsigned long unused
, struct task_struct
*p
,
597 struct pt_regs
*regs
)
599 struct pt_regs
*childregs
, *kregs
;
600 extern void ret_from_fork(void);
601 unsigned long sp
= (unsigned long)task_stack_page(p
) + THREAD_SIZE
;
603 CHECK_FULL_REGS(regs
);
605 sp
-= sizeof(struct pt_regs
);
606 childregs
= (struct pt_regs
*) sp
;
608 if ((childregs
->msr
& MSR_PR
) == 0) {
609 /* for kernel thread, set `current' and stackptr in new task */
610 childregs
->gpr
[1] = sp
+ sizeof(struct pt_regs
);
612 childregs
->gpr
[2] = (unsigned long) p
;
614 clear_tsk_thread_flag(p
, TIF_32BIT
);
616 p
->thread
.regs
= NULL
; /* no user register state */
618 childregs
->gpr
[1] = usp
;
619 p
->thread
.regs
= childregs
;
620 if (clone_flags
& CLONE_SETTLS
) {
622 if (!test_thread_flag(TIF_32BIT
))
623 childregs
->gpr
[13] = childregs
->gpr
[6];
626 childregs
->gpr
[2] = childregs
->gpr
[6];
629 childregs
->gpr
[3] = 0; /* Result from fork() */
630 sp
-= STACK_FRAME_OVERHEAD
;
633 * The way this works is that at some point in the future
634 * some task will call _switch to switch to the new task.
635 * That will pop off the stack frame created below and start
636 * the new task running at ret_from_fork. The new task will
637 * do some house keeping and then return from the fork or clone
638 * system call, using the stack frame created above.
640 sp
-= sizeof(struct pt_regs
);
641 kregs
= (struct pt_regs
*) sp
;
642 sp
-= STACK_FRAME_OVERHEAD
;
644 p
->thread
.ksp_limit
= (unsigned long)task_stack_page(p
) +
645 _ALIGN_UP(sizeof(struct thread_info
), 16);
648 if (cpu_has_feature(CPU_FTR_SLB
)) {
649 unsigned long sp_vsid
;
650 unsigned long llp
= mmu_psize_defs
[mmu_linear_psize
].sllp
;
652 if (cpu_has_feature(CPU_FTR_1T_SEGMENT
))
653 sp_vsid
= get_kernel_vsid(sp
, MMU_SEGSIZE_1T
)
654 << SLB_VSID_SHIFT_1T
;
656 sp_vsid
= get_kernel_vsid(sp
, MMU_SEGSIZE_256M
)
658 sp_vsid
|= SLB_VSID_KERNEL
| llp
;
659 p
->thread
.ksp_vsid
= sp_vsid
;
663 * The PPC64 ABI makes use of a TOC to contain function
664 * pointers. The function (ret_from_except) is actually a pointer
665 * to the TOC entry. The first entry is a pointer to the actual
668 kregs
->nip
= *((unsigned long *)ret_from_fork
);
670 kregs
->nip
= (unsigned long)ret_from_fork
;
677 * Set up a thread for executing a new program
679 void start_thread(struct pt_regs
*regs
, unsigned long start
, unsigned long sp
)
682 unsigned long load_addr
= regs
->gpr
[2]; /* saved by ELF_PLAT_INIT */
688 * If we exec out of a kernel thread then thread.regs will not be
691 if (!current
->thread
.regs
) {
692 struct pt_regs
*regs
= task_stack_page(current
) + THREAD_SIZE
;
693 current
->thread
.regs
= regs
- 1;
696 memset(regs
->gpr
, 0, sizeof(regs
->gpr
));
704 * We have just cleared all the nonvolatile GPRs, so make
705 * FULL_REGS(regs) return true. This is necessary to allow
706 * ptrace to examine the thread immediately after exec.
713 regs
->msr
= MSR_USER
;
715 if (!test_thread_flag(TIF_32BIT
)) {
716 unsigned long entry
, toc
;
718 /* start is a relocated pointer to the function descriptor for
719 * the elf _start routine. The first entry in the function
720 * descriptor is the entry address of _start and the second
721 * entry is the TOC value we need to use.
723 __get_user(entry
, (unsigned long __user
*)start
);
724 __get_user(toc
, (unsigned long __user
*)start
+1);
726 /* Check whether the e_entry function descriptor entries
727 * need to be relocated before we can use them.
729 if (load_addr
!= 0) {
735 regs
->msr
= MSR_USER64
;
739 regs
->msr
= MSR_USER32
;
743 discard_lazy_cpu_state();
745 current
->thread
.used_vsr
= 0;
747 memset(current
->thread
.fpr
, 0, sizeof(current
->thread
.fpr
));
748 current
->thread
.fpscr
.val
= 0;
749 #ifdef CONFIG_ALTIVEC
750 memset(current
->thread
.vr
, 0, sizeof(current
->thread
.vr
));
751 memset(¤t
->thread
.vscr
, 0, sizeof(current
->thread
.vscr
));
752 current
->thread
.vscr
.u
[3] = 0x00010000; /* Java mode disabled */
753 current
->thread
.vrsave
= 0;
754 current
->thread
.used_vr
= 0;
755 #endif /* CONFIG_ALTIVEC */
757 memset(current
->thread
.evr
, 0, sizeof(current
->thread
.evr
));
758 current
->thread
.acc
= 0;
759 current
->thread
.spefscr
= 0;
760 current
->thread
.used_spe
= 0;
761 #endif /* CONFIG_SPE */
764 #define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \
765 | PR_FP_EXC_RES | PR_FP_EXC_INV)
767 int set_fpexc_mode(struct task_struct
*tsk
, unsigned int val
)
769 struct pt_regs
*regs
= tsk
->thread
.regs
;
771 /* This is a bit hairy. If we are an SPE enabled processor
772 * (have embedded fp) we store the IEEE exception enable flags in
773 * fpexc_mode. fpexc_mode is also used for setting FP exception
774 * mode (asyn, precise, disabled) for 'Classic' FP. */
775 if (val
& PR_FP_EXC_SW_ENABLE
) {
777 if (cpu_has_feature(CPU_FTR_SPE
)) {
778 tsk
->thread
.fpexc_mode
= val
&
779 (PR_FP_EXC_SW_ENABLE
| PR_FP_ALL_EXCEPT
);
789 /* on a CONFIG_SPE this does not hurt us. The bits that
790 * __pack_fe01 use do not overlap with bits used for
791 * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits
792 * on CONFIG_SPE implementations are reserved so writing to
793 * them does not change anything */
794 if (val
> PR_FP_EXC_PRECISE
)
796 tsk
->thread
.fpexc_mode
= __pack_fe01(val
);
797 if (regs
!= NULL
&& (regs
->msr
& MSR_FP
) != 0)
798 regs
->msr
= (regs
->msr
& ~(MSR_FE0
|MSR_FE1
))
799 | tsk
->thread
.fpexc_mode
;
803 int get_fpexc_mode(struct task_struct
*tsk
, unsigned long adr
)
807 if (tsk
->thread
.fpexc_mode
& PR_FP_EXC_SW_ENABLE
)
809 if (cpu_has_feature(CPU_FTR_SPE
))
810 val
= tsk
->thread
.fpexc_mode
;
817 val
= __unpack_fe01(tsk
->thread
.fpexc_mode
);
818 return put_user(val
, (unsigned int __user
*) adr
);
821 int set_endian(struct task_struct
*tsk
, unsigned int val
)
823 struct pt_regs
*regs
= tsk
->thread
.regs
;
825 if ((val
== PR_ENDIAN_LITTLE
&& !cpu_has_feature(CPU_FTR_REAL_LE
)) ||
826 (val
== PR_ENDIAN_PPC_LITTLE
&& !cpu_has_feature(CPU_FTR_PPC_LE
)))
832 if (val
== PR_ENDIAN_BIG
)
833 regs
->msr
&= ~MSR_LE
;
834 else if (val
== PR_ENDIAN_LITTLE
|| val
== PR_ENDIAN_PPC_LITTLE
)
842 int get_endian(struct task_struct
*tsk
, unsigned long adr
)
844 struct pt_regs
*regs
= tsk
->thread
.regs
;
847 if (!cpu_has_feature(CPU_FTR_PPC_LE
) &&
848 !cpu_has_feature(CPU_FTR_REAL_LE
))
854 if (regs
->msr
& MSR_LE
) {
855 if (cpu_has_feature(CPU_FTR_REAL_LE
))
856 val
= PR_ENDIAN_LITTLE
;
858 val
= PR_ENDIAN_PPC_LITTLE
;
862 return put_user(val
, (unsigned int __user
*)adr
);
865 int set_unalign_ctl(struct task_struct
*tsk
, unsigned int val
)
867 tsk
->thread
.align_ctl
= val
;
871 int get_unalign_ctl(struct task_struct
*tsk
, unsigned long adr
)
873 return put_user(tsk
->thread
.align_ctl
, (unsigned int __user
*)adr
);
876 #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff))
878 int sys_clone(unsigned long clone_flags
, unsigned long usp
,
879 int __user
*parent_tidp
, void __user
*child_threadptr
,
880 int __user
*child_tidp
, int p6
,
881 struct pt_regs
*regs
)
883 CHECK_FULL_REGS(regs
);
885 usp
= regs
->gpr
[1]; /* stack pointer for child */
887 if (test_thread_flag(TIF_32BIT
)) {
888 parent_tidp
= TRUNC_PTR(parent_tidp
);
889 child_tidp
= TRUNC_PTR(child_tidp
);
892 return do_fork(clone_flags
, usp
, regs
, 0, parent_tidp
, child_tidp
);
895 int sys_fork(unsigned long p1
, unsigned long p2
, unsigned long p3
,
896 unsigned long p4
, unsigned long p5
, unsigned long p6
,
897 struct pt_regs
*regs
)
899 CHECK_FULL_REGS(regs
);
900 return do_fork(SIGCHLD
, regs
->gpr
[1], regs
, 0, NULL
, NULL
);
903 int sys_vfork(unsigned long p1
, unsigned long p2
, unsigned long p3
,
904 unsigned long p4
, unsigned long p5
, unsigned long p6
,
905 struct pt_regs
*regs
)
907 CHECK_FULL_REGS(regs
);
908 return do_fork(CLONE_VFORK
| CLONE_VM
| SIGCHLD
, regs
->gpr
[1],
909 regs
, 0, NULL
, NULL
);
912 int sys_execve(unsigned long a0
, unsigned long a1
, unsigned long a2
,
913 unsigned long a3
, unsigned long a4
, unsigned long a5
,
914 struct pt_regs
*regs
)
919 filename
= getname((char __user
*) a0
);
920 error
= PTR_ERR(filename
);
921 if (IS_ERR(filename
))
923 flush_fp_to_thread(current
);
924 flush_altivec_to_thread(current
);
925 flush_spe_to_thread(current
);
926 error
= do_execve(filename
, (char __user
* __user
*) a1
,
927 (char __user
* __user
*) a2
, regs
);
933 #ifdef CONFIG_IRQSTACKS
934 static inline int valid_irq_stack(unsigned long sp
, struct task_struct
*p
,
935 unsigned long nbytes
)
937 unsigned long stack_page
;
938 unsigned long cpu
= task_cpu(p
);
941 * Avoid crashing if the stack has overflowed and corrupted
942 * task_cpu(p), which is in the thread_info struct.
944 if (cpu
< NR_CPUS
&& cpu_possible(cpu
)) {
945 stack_page
= (unsigned long) hardirq_ctx
[cpu
];
946 if (sp
>= stack_page
+ sizeof(struct thread_struct
)
947 && sp
<= stack_page
+ THREAD_SIZE
- nbytes
)
950 stack_page
= (unsigned long) softirq_ctx
[cpu
];
951 if (sp
>= stack_page
+ sizeof(struct thread_struct
)
952 && sp
<= stack_page
+ THREAD_SIZE
- nbytes
)
959 #define valid_irq_stack(sp, p, nb) 0
960 #endif /* CONFIG_IRQSTACKS */
962 int validate_sp(unsigned long sp
, struct task_struct
*p
,
963 unsigned long nbytes
)
965 unsigned long stack_page
= (unsigned long)task_stack_page(p
);
967 if (sp
>= stack_page
+ sizeof(struct thread_struct
)
968 && sp
<= stack_page
+ THREAD_SIZE
- nbytes
)
971 return valid_irq_stack(sp
, p
, nbytes
);
974 EXPORT_SYMBOL(validate_sp
);
976 unsigned long get_wchan(struct task_struct
*p
)
978 unsigned long ip
, sp
;
981 if (!p
|| p
== current
|| p
->state
== TASK_RUNNING
)
985 if (!validate_sp(sp
, p
, STACK_FRAME_OVERHEAD
))
989 sp
= *(unsigned long *)sp
;
990 if (!validate_sp(sp
, p
, STACK_FRAME_OVERHEAD
))
993 ip
= ((unsigned long *)sp
)[STACK_FRAME_LR_SAVE
];
994 if (!in_sched_functions(ip
))
997 } while (count
++ < 16);
1001 static int kstack_depth_to_print
= 64;
1003 void show_stack(struct task_struct
*tsk
, unsigned long *stack
)
1005 unsigned long sp
, ip
, lr
, newsp
;
1009 sp
= (unsigned long) stack
;
1014 asm("mr %0,1" : "=r" (sp
));
1016 sp
= tsk
->thread
.ksp
;
1020 printk("Call Trace:\n");
1022 if (!validate_sp(sp
, tsk
, STACK_FRAME_OVERHEAD
))
1025 stack
= (unsigned long *) sp
;
1027 ip
= stack
[STACK_FRAME_LR_SAVE
];
1028 if (!firstframe
|| ip
!= lr
) {
1029 printk("["REG
"] ["REG
"] %pS", sp
, ip
, (void *)ip
);
1031 printk(" (unreliable)");
1037 * See if this is an exception frame.
1038 * We look for the "regshere" marker in the current frame.
1040 if (validate_sp(sp
, tsk
, STACK_INT_FRAME_SIZE
)
1041 && stack
[STACK_FRAME_MARKER
] == STACK_FRAME_REGS_MARKER
) {
1042 struct pt_regs
*regs
= (struct pt_regs
*)
1043 (sp
+ STACK_FRAME_OVERHEAD
);
1045 printk("--- Exception: %lx at %pS\n LR = %pS\n",
1046 regs
->trap
, (void *)regs
->nip
, (void *)lr
);
1051 } while (count
++ < kstack_depth_to_print
);
1054 void dump_stack(void)
1056 show_stack(current
, NULL
);
1058 EXPORT_SYMBOL(dump_stack
);
1061 void ppc64_runlatch_on(void)
1065 if (cpu_has_feature(CPU_FTR_CTRL
) && !test_thread_flag(TIF_RUNLATCH
)) {
1068 ctrl
= mfspr(SPRN_CTRLF
);
1069 ctrl
|= CTRL_RUNLATCH
;
1070 mtspr(SPRN_CTRLT
, ctrl
);
1072 set_thread_flag(TIF_RUNLATCH
);
1076 void ppc64_runlatch_off(void)
1080 if (cpu_has_feature(CPU_FTR_CTRL
) && test_thread_flag(TIF_RUNLATCH
)) {
1083 clear_thread_flag(TIF_RUNLATCH
);
1085 ctrl
= mfspr(SPRN_CTRLF
);
1086 ctrl
&= ~CTRL_RUNLATCH
;
1087 mtspr(SPRN_CTRLT
, ctrl
);
1092 #if THREAD_SHIFT < PAGE_SHIFT
1094 static struct kmem_cache
*thread_info_cache
;
1096 struct thread_info
*alloc_thread_info(struct task_struct
*tsk
)
1098 struct thread_info
*ti
;
1100 ti
= kmem_cache_alloc(thread_info_cache
, GFP_KERNEL
);
1101 if (unlikely(ti
== NULL
))
1103 #ifdef CONFIG_DEBUG_STACK_USAGE
1104 memset(ti
, 0, THREAD_SIZE
);
1109 void free_thread_info(struct thread_info
*ti
)
1111 kmem_cache_free(thread_info_cache
, ti
);
1114 void thread_info_cache_init(void)
1116 thread_info_cache
= kmem_cache_create("thread_info", THREAD_SIZE
,
1117 THREAD_SIZE
, 0, NULL
);
1118 BUG_ON(thread_info_cache
== NULL
);
1121 #endif /* THREAD_SHIFT < PAGE_SHIFT */
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