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/ftrace.h>
37 #include <linux/kernel_stat.h>
38 #include <linux/personality.h>
39 #include <linux/random.h>
41 #include <asm/pgtable.h>
42 #include <asm/uaccess.h>
43 #include <asm/system.h>
45 #include <asm/processor.h>
48 #include <asm/machdep.h>
50 #include <asm/syscalls.h>
52 #include <asm/firmware.h>
54 #include <linux/kprobes.h>
55 #include <linux/kdebug.h>
57 extern unsigned long _get_SP(void);
60 struct task_struct
*last_task_used_math
= NULL
;
61 struct task_struct
*last_task_used_altivec
= NULL
;
62 struct task_struct
*last_task_used_vsx
= NULL
;
63 struct task_struct
*last_task_used_spe
= NULL
;
67 * Make sure the floating-point register state in the
68 * the thread_struct is up to date for task tsk.
70 void flush_fp_to_thread(struct task_struct
*tsk
)
72 if (tsk
->thread
.regs
) {
74 * We need to disable preemption here because if we didn't,
75 * another process could get scheduled after the regs->msr
76 * test but before we have finished saving the FP registers
77 * to the thread_struct. That process could take over the
78 * FPU, and then when we get scheduled again we would store
79 * bogus values for the remaining FP registers.
82 if (tsk
->thread
.regs
->msr
& MSR_FP
) {
85 * This should only ever be called for current or
86 * for a stopped child process. Since we save away
87 * the FP register state on context switch on SMP,
88 * there is something wrong if a stopped child appears
89 * to still have its FP state in the CPU registers.
91 BUG_ON(tsk
!= current
);
99 void enable_kernel_fp(void)
101 WARN_ON(preemptible());
104 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_FP
))
107 giveup_fpu(NULL
); /* just enables FP for kernel */
109 giveup_fpu(last_task_used_math
);
110 #endif /* CONFIG_SMP */
112 EXPORT_SYMBOL(enable_kernel_fp
);
114 #ifdef CONFIG_ALTIVEC
115 void enable_kernel_altivec(void)
117 WARN_ON(preemptible());
120 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_VEC
))
121 giveup_altivec(current
);
123 giveup_altivec(NULL
); /* just enable AltiVec for kernel - force */
125 giveup_altivec(last_task_used_altivec
);
126 #endif /* CONFIG_SMP */
128 EXPORT_SYMBOL(enable_kernel_altivec
);
131 * Make sure the VMX/Altivec register state in the
132 * the thread_struct is up to date for task tsk.
134 void flush_altivec_to_thread(struct task_struct
*tsk
)
136 if (tsk
->thread
.regs
) {
138 if (tsk
->thread
.regs
->msr
& MSR_VEC
) {
140 BUG_ON(tsk
!= current
);
147 #endif /* CONFIG_ALTIVEC */
151 /* not currently used, but some crazy RAID module might want to later */
152 void enable_kernel_vsx(void)
154 WARN_ON(preemptible());
157 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_VSX
))
160 giveup_vsx(NULL
); /* just enable vsx for kernel - force */
162 giveup_vsx(last_task_used_vsx
);
163 #endif /* CONFIG_SMP */
165 EXPORT_SYMBOL(enable_kernel_vsx
);
168 void giveup_vsx(struct task_struct
*tsk
)
175 void flush_vsx_to_thread(struct task_struct
*tsk
)
177 if (tsk
->thread
.regs
) {
179 if (tsk
->thread
.regs
->msr
& MSR_VSX
) {
181 BUG_ON(tsk
!= current
);
188 #endif /* CONFIG_VSX */
192 void enable_kernel_spe(void)
194 WARN_ON(preemptible());
197 if (current
->thread
.regs
&& (current
->thread
.regs
->msr
& MSR_SPE
))
200 giveup_spe(NULL
); /* just enable SPE for kernel - force */
202 giveup_spe(last_task_used_spe
);
203 #endif /* __SMP __ */
205 EXPORT_SYMBOL(enable_kernel_spe
);
207 void flush_spe_to_thread(struct task_struct
*tsk
)
209 if (tsk
->thread
.regs
) {
211 if (tsk
->thread
.regs
->msr
& MSR_SPE
) {
213 BUG_ON(tsk
!= current
);
220 #endif /* CONFIG_SPE */
224 * If we are doing lazy switching of CPU state (FP, altivec or SPE),
225 * and the current task has some state, discard it.
227 void discard_lazy_cpu_state(void)
230 if (last_task_used_math
== current
)
231 last_task_used_math
= NULL
;
232 #ifdef CONFIG_ALTIVEC
233 if (last_task_used_altivec
== current
)
234 last_task_used_altivec
= NULL
;
235 #endif /* CONFIG_ALTIVEC */
237 if (last_task_used_vsx
== current
)
238 last_task_used_vsx
= NULL
;
239 #endif /* CONFIG_VSX */
241 if (last_task_used_spe
== current
)
242 last_task_used_spe
= NULL
;
246 #endif /* CONFIG_SMP */
248 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
249 void do_send_trap(struct pt_regs
*regs
, unsigned long address
,
250 unsigned long error_code
, int signal_code
, int breakpt
)
254 if (notify_die(DIE_DABR_MATCH
, "dabr_match", regs
, error_code
,
255 11, SIGSEGV
) == NOTIFY_STOP
)
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
);
265 #else /* !CONFIG_PPC_ADV_DEBUG_REGS */
266 void do_dabr(struct pt_regs
*regs
, unsigned long address
,
267 unsigned long error_code
)
271 if (notify_die(DIE_DABR_MATCH
, "dabr_match", regs
, error_code
,
272 11, SIGSEGV
) == NOTIFY_STOP
)
275 if (debugger_dabr_match(regs
))
281 /* Deliver the signal to userspace */
282 info
.si_signo
= SIGTRAP
;
284 info
.si_code
= TRAP_HWBKPT
;
285 info
.si_addr
= (void __user
*)address
;
286 force_sig_info(SIGTRAP
, &info
, current
);
288 #endif /* CONFIG_PPC_ADV_DEBUG_REGS */
290 static DEFINE_PER_CPU(unsigned long, current_dabr
);
292 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
294 * Set the debug registers back to their default "safe" values.
296 static void set_debug_reg_defaults(struct thread_struct
*thread
)
298 thread
->iac1
= thread
->iac2
= 0;
299 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
300 thread
->iac3
= thread
->iac4
= 0;
302 thread
->dac1
= thread
->dac2
= 0;
303 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
304 thread
->dvc1
= thread
->dvc2
= 0;
309 * Force User/Supervisor bits to b11 (user-only MSR[PR]=1)
311 thread
->dbcr1
= DBCR1_IAC1US
| DBCR1_IAC2US
| \
312 DBCR1_IAC3US
| DBCR1_IAC4US
;
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.
317 thread
->dbcr2
= DBCR2_DAC1US
| DBCR2_DAC2US
;
323 static void prime_debug_regs(struct thread_struct
*thread
)
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
);
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
);
337 mtspr(SPRN_DBCR0
, thread
->dbcr0
);
338 mtspr(SPRN_DBCR1
, thread
->dbcr1
);
340 mtspr(SPRN_DBCR2
, thread
->dbcr2
);
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.
348 static void switch_booke_debug_regs(struct thread_struct
*new_thread
)
350 if ((current
->thread
.dbcr0
& DBCR0_IDM
)
351 || (new_thread
->dbcr0
& DBCR0_IDM
))
352 prime_debug_regs(new_thread
);
354 #else /* !CONFIG_PPC_ADV_DEBUG_REGS */
355 static void set_debug_reg_defaults(struct thread_struct
*thread
)
362 #endif /* CONFIG_PPC_ADV_DEBUG_REGS */
364 int set_dabr(unsigned long dabr
)
366 __get_cpu_var(current_dabr
) = dabr
;
369 return ppc_md
.set_dabr(dabr
);
371 /* XXX should we have a CPU_FTR_HAS_DABR ? */
372 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
373 mtspr(SPRN_DAC1
, dabr
);
374 #elif defined(CONFIG_PPC_BOOK3S)
375 mtspr(SPRN_DABR
, dabr
);
383 DEFINE_PER_CPU(struct cpu_usage
, cpu_usage_array
);
386 struct task_struct
*__switch_to(struct task_struct
*prev
,
387 struct task_struct
*new)
389 struct thread_struct
*new_thread
, *old_thread
;
391 struct task_struct
*last
;
394 /* avoid complexity of lazy save/restore of fpu
395 * by just saving it every time we switch out if
396 * this task used the fpu during the last quantum.
398 * If it tries to use the fpu again, it'll trap and
399 * reload its fp regs. So we don't have to do a restore
400 * every switch, just a save.
403 if (prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_FP
))
405 #ifdef CONFIG_ALTIVEC
407 * If the previous thread used altivec in the last quantum
408 * (thus changing altivec regs) then save them.
409 * We used to check the VRSAVE register but not all apps
410 * set it, so we don't rely on it now (and in fact we need
411 * to save & restore VSCR even if VRSAVE == 0). -- paulus
413 * On SMP we always save/restore altivec regs just to avoid the
414 * complexity of changing processors.
417 if (prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_VEC
))
418 giveup_altivec(prev
);
419 #endif /* CONFIG_ALTIVEC */
421 if (prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_VSX
))
422 /* VMX and FPU registers are already save here */
424 #endif /* CONFIG_VSX */
427 * If the previous thread used spe in the last quantum
428 * (thus changing spe regs) then save them.
430 * On SMP we always save/restore spe regs just to avoid the
431 * complexity of changing processors.
433 if ((prev
->thread
.regs
&& (prev
->thread
.regs
->msr
& MSR_SPE
)))
435 #endif /* CONFIG_SPE */
437 #else /* CONFIG_SMP */
438 #ifdef CONFIG_ALTIVEC
439 /* Avoid the trap. On smp this this never happens since
440 * we don't set last_task_used_altivec -- Cort
442 if (new->thread
.regs
&& last_task_used_altivec
== new)
443 new->thread
.regs
->msr
|= MSR_VEC
;
444 #endif /* CONFIG_ALTIVEC */
446 if (new->thread
.regs
&& last_task_used_vsx
== new)
447 new->thread
.regs
->msr
|= MSR_VSX
;
448 #endif /* CONFIG_VSX */
450 /* Avoid the trap. On smp this this never happens since
451 * we don't set last_task_used_spe
453 if (new->thread
.regs
&& last_task_used_spe
== new)
454 new->thread
.regs
->msr
|= MSR_SPE
;
455 #endif /* CONFIG_SPE */
457 #endif /* CONFIG_SMP */
459 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
460 switch_booke_debug_regs(&new->thread
);
462 if (unlikely(__get_cpu_var(current_dabr
) != new->thread
.dabr
))
463 set_dabr(new->thread
.dabr
);
467 new_thread
= &new->thread
;
468 old_thread
= ¤t
->thread
;
472 * Collect processor utilization data per process
474 if (firmware_has_feature(FW_FEATURE_SPLPAR
)) {
475 struct cpu_usage
*cu
= &__get_cpu_var(cpu_usage_array
);
476 long unsigned start_tb
, current_tb
;
477 start_tb
= old_thread
->start_tb
;
478 cu
->current_tb
= current_tb
= mfspr(SPRN_PURR
);
479 old_thread
->accum_tb
+= (current_tb
- start_tb
);
480 new_thread
->start_tb
= current_tb
;
484 local_irq_save(flags
);
486 account_system_vtime(current
);
487 account_process_vtime(current
);
488 calculate_steal_time();
491 * We can't take a PMU exception inside _switch() since there is a
492 * window where the kernel stack SLB and the kernel stack are out
493 * of sync. Hard disable here.
496 last
= _switch(old_thread
, new_thread
);
498 local_irq_restore(flags
);
503 static int instructions_to_print
= 16;
505 static void show_instructions(struct pt_regs
*regs
)
508 unsigned long pc
= regs
->nip
- (instructions_to_print
* 3 / 4 *
511 printk("Instruction dump:");
513 for (i
= 0; i
< instructions_to_print
; i
++) {
519 #if !defined(CONFIG_BOOKE)
520 /* If executing with the IMMU off, adjust pc rather
521 * than print XXXXXXXX.
523 if (!(regs
->msr
& MSR_IR
))
524 pc
= (unsigned long)phys_to_virt(pc
);
527 /* We use __get_user here *only* to avoid an OOPS on a
528 * bad address because the pc *should* only be a
531 if (!__kernel_text_address(pc
) ||
532 __get_user(instr
, (unsigned int __user
*)pc
)) {
536 printk("<%08x> ", instr
);
538 printk("%08x ", instr
);
547 static struct regbit
{
564 static void printbits(unsigned long val
, struct regbit
*bits
)
566 const char *sep
= "";
569 for (; bits
->bit
; ++bits
)
570 if (val
& bits
->bit
) {
571 printk("%s%s", sep
, bits
->name
);
579 #define REGS_PER_LINE 4
580 #define LAST_VOLATILE 13
583 #define REGS_PER_LINE 8
584 #define LAST_VOLATILE 12
587 void show_regs(struct pt_regs
* regs
)
591 printk("NIP: "REG
" LR: "REG
" CTR: "REG
"\n",
592 regs
->nip
, regs
->link
, regs
->ctr
);
593 printk("REGS: %p TRAP: %04lx %s (%s)\n",
594 regs
, regs
->trap
, print_tainted(), init_utsname()->release
);
595 printk("MSR: "REG
" ", regs
->msr
);
596 printbits(regs
->msr
, msr_bits
);
597 printk(" CR: %08lx XER: %08lx\n", regs
->ccr
, regs
->xer
);
599 if (trap
== 0x300 || trap
== 0x600)
600 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
601 printk("DEAR: "REG
", ESR: "REG
"\n", regs
->dar
, regs
->dsisr
);
603 printk("DAR: "REG
", DSISR: "REG
"\n", regs
->dar
, regs
->dsisr
);
605 printk("TASK = %p[%d] '%s' THREAD: %p",
606 current
, task_pid_nr(current
), current
->comm
, task_thread_info(current
));
609 printk(" CPU: %d", raw_smp_processor_id());
610 #endif /* CONFIG_SMP */
612 for (i
= 0; i
< 32; i
++) {
613 if ((i
% REGS_PER_LINE
) == 0)
614 printk("\nGPR%02d: ", i
);
615 printk(REG
" ", regs
->gpr
[i
]);
616 if (i
== LAST_VOLATILE
&& !FULL_REGS(regs
))
620 #ifdef CONFIG_KALLSYMS
622 * Lookup NIP late so we have the best change of getting the
623 * above info out without failing
625 printk("NIP ["REG
"] %pS\n", regs
->nip
, (void *)regs
->nip
);
626 printk("LR ["REG
"] %pS\n", regs
->link
, (void *)regs
->link
);
628 show_stack(current
, (unsigned long *) regs
->gpr
[1]);
629 if (!user_mode(regs
))
630 show_instructions(regs
);
633 void exit_thread(void)
635 discard_lazy_cpu_state();
638 void flush_thread(void)
640 discard_lazy_cpu_state();
642 set_debug_reg_defaults(¤t
->thread
);
646 release_thread(struct task_struct
*t
)
651 * This gets called before we allocate a new thread and copy
652 * the current task into it.
654 void prepare_to_copy(struct task_struct
*tsk
)
656 flush_fp_to_thread(current
);
657 flush_altivec_to_thread(current
);
658 flush_vsx_to_thread(current
);
659 flush_spe_to_thread(current
);
665 int copy_thread(unsigned long clone_flags
, unsigned long usp
,
666 unsigned long unused
, struct task_struct
*p
,
667 struct pt_regs
*regs
)
669 struct pt_regs
*childregs
, *kregs
;
670 extern void ret_from_fork(void);
671 unsigned long sp
= (unsigned long)task_stack_page(p
) + THREAD_SIZE
;
673 CHECK_FULL_REGS(regs
);
675 sp
-= sizeof(struct pt_regs
);
676 childregs
= (struct pt_regs
*) sp
;
678 if ((childregs
->msr
& MSR_PR
) == 0) {
679 /* for kernel thread, set `current' and stackptr in new task */
680 childregs
->gpr
[1] = sp
+ sizeof(struct pt_regs
);
682 childregs
->gpr
[2] = (unsigned long) p
;
684 clear_tsk_thread_flag(p
, TIF_32BIT
);
686 p
->thread
.regs
= NULL
; /* no user register state */
688 childregs
->gpr
[1] = usp
;
689 p
->thread
.regs
= childregs
;
690 if (clone_flags
& CLONE_SETTLS
) {
692 if (!test_thread_flag(TIF_32BIT
))
693 childregs
->gpr
[13] = childregs
->gpr
[6];
696 childregs
->gpr
[2] = childregs
->gpr
[6];
699 childregs
->gpr
[3] = 0; /* Result from fork() */
700 sp
-= STACK_FRAME_OVERHEAD
;
703 * The way this works is that at some point in the future
704 * some task will call _switch to switch to the new task.
705 * That will pop off the stack frame created below and start
706 * the new task running at ret_from_fork. The new task will
707 * do some house keeping and then return from the fork or clone
708 * system call, using the stack frame created above.
710 sp
-= sizeof(struct pt_regs
);
711 kregs
= (struct pt_regs
*) sp
;
712 sp
-= STACK_FRAME_OVERHEAD
;
714 p
->thread
.ksp_limit
= (unsigned long)task_stack_page(p
) +
715 _ALIGN_UP(sizeof(struct thread_info
), 16);
717 #ifdef CONFIG_PPC_STD_MMU_64
718 if (cpu_has_feature(CPU_FTR_SLB
)) {
719 unsigned long sp_vsid
;
720 unsigned long llp
= mmu_psize_defs
[mmu_linear_psize
].sllp
;
722 if (cpu_has_feature(CPU_FTR_1T_SEGMENT
))
723 sp_vsid
= get_kernel_vsid(sp
, MMU_SEGSIZE_1T
)
724 << SLB_VSID_SHIFT_1T
;
726 sp_vsid
= get_kernel_vsid(sp
, MMU_SEGSIZE_256M
)
728 sp_vsid
|= SLB_VSID_KERNEL
| llp
;
729 p
->thread
.ksp_vsid
= sp_vsid
;
731 #endif /* CONFIG_PPC_STD_MMU_64 */
734 * The PPC64 ABI makes use of a TOC to contain function
735 * pointers. The function (ret_from_except) is actually a pointer
736 * to the TOC entry. The first entry is a pointer to the actual
740 kregs
->nip
= *((unsigned long *)ret_from_fork
);
742 kregs
->nip
= (unsigned long)ret_from_fork
;
749 * Set up a thread for executing a new program
751 void start_thread(struct pt_regs
*regs
, unsigned long start
, unsigned long sp
)
754 unsigned long load_addr
= regs
->gpr
[2]; /* saved by ELF_PLAT_INIT */
760 * If we exec out of a kernel thread then thread.regs will not be
763 if (!current
->thread
.regs
) {
764 struct pt_regs
*regs
= task_stack_page(current
) + THREAD_SIZE
;
765 current
->thread
.regs
= regs
- 1;
768 memset(regs
->gpr
, 0, sizeof(regs
->gpr
));
776 * We have just cleared all the nonvolatile GPRs, so make
777 * FULL_REGS(regs) return true. This is necessary to allow
778 * ptrace to examine the thread immediately after exec.
785 regs
->msr
= MSR_USER
;
787 if (!test_thread_flag(TIF_32BIT
)) {
788 unsigned long entry
, toc
;
790 /* start is a relocated pointer to the function descriptor for
791 * the elf _start routine. The first entry in the function
792 * descriptor is the entry address of _start and the second
793 * entry is the TOC value we need to use.
795 __get_user(entry
, (unsigned long __user
*)start
);
796 __get_user(toc
, (unsigned long __user
*)start
+1);
798 /* Check whether the e_entry function descriptor entries
799 * need to be relocated before we can use them.
801 if (load_addr
!= 0) {
807 regs
->msr
= MSR_USER64
;
811 regs
->msr
= MSR_USER32
;
815 discard_lazy_cpu_state();
817 current
->thread
.used_vsr
= 0;
819 memset(current
->thread
.fpr
, 0, sizeof(current
->thread
.fpr
));
820 current
->thread
.fpscr
.val
= 0;
821 #ifdef CONFIG_ALTIVEC
822 memset(current
->thread
.vr
, 0, sizeof(current
->thread
.vr
));
823 memset(¤t
->thread
.vscr
, 0, sizeof(current
->thread
.vscr
));
824 current
->thread
.vscr
.u
[3] = 0x00010000; /* Java mode disabled */
825 current
->thread
.vrsave
= 0;
826 current
->thread
.used_vr
= 0;
827 #endif /* CONFIG_ALTIVEC */
829 memset(current
->thread
.evr
, 0, sizeof(current
->thread
.evr
));
830 current
->thread
.acc
= 0;
831 current
->thread
.spefscr
= 0;
832 current
->thread
.used_spe
= 0;
833 #endif /* CONFIG_SPE */
836 #define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \
837 | PR_FP_EXC_RES | PR_FP_EXC_INV)
839 int set_fpexc_mode(struct task_struct
*tsk
, unsigned int val
)
841 struct pt_regs
*regs
= tsk
->thread
.regs
;
843 /* This is a bit hairy. If we are an SPE enabled processor
844 * (have embedded fp) we store the IEEE exception enable flags in
845 * fpexc_mode. fpexc_mode is also used for setting FP exception
846 * mode (asyn, precise, disabled) for 'Classic' FP. */
847 if (val
& PR_FP_EXC_SW_ENABLE
) {
849 if (cpu_has_feature(CPU_FTR_SPE
)) {
850 tsk
->thread
.fpexc_mode
= val
&
851 (PR_FP_EXC_SW_ENABLE
| PR_FP_ALL_EXCEPT
);
861 /* on a CONFIG_SPE this does not hurt us. The bits that
862 * __pack_fe01 use do not overlap with bits used for
863 * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits
864 * on CONFIG_SPE implementations are reserved so writing to
865 * them does not change anything */
866 if (val
> PR_FP_EXC_PRECISE
)
868 tsk
->thread
.fpexc_mode
= __pack_fe01(val
);
869 if (regs
!= NULL
&& (regs
->msr
& MSR_FP
) != 0)
870 regs
->msr
= (regs
->msr
& ~(MSR_FE0
|MSR_FE1
))
871 | tsk
->thread
.fpexc_mode
;
875 int get_fpexc_mode(struct task_struct
*tsk
, unsigned long adr
)
879 if (tsk
->thread
.fpexc_mode
& PR_FP_EXC_SW_ENABLE
)
881 if (cpu_has_feature(CPU_FTR_SPE
))
882 val
= tsk
->thread
.fpexc_mode
;
889 val
= __unpack_fe01(tsk
->thread
.fpexc_mode
);
890 return put_user(val
, (unsigned int __user
*) adr
);
893 int set_endian(struct task_struct
*tsk
, unsigned int val
)
895 struct pt_regs
*regs
= tsk
->thread
.regs
;
897 if ((val
== PR_ENDIAN_LITTLE
&& !cpu_has_feature(CPU_FTR_REAL_LE
)) ||
898 (val
== PR_ENDIAN_PPC_LITTLE
&& !cpu_has_feature(CPU_FTR_PPC_LE
)))
904 if (val
== PR_ENDIAN_BIG
)
905 regs
->msr
&= ~MSR_LE
;
906 else if (val
== PR_ENDIAN_LITTLE
|| val
== PR_ENDIAN_PPC_LITTLE
)
914 int get_endian(struct task_struct
*tsk
, unsigned long adr
)
916 struct pt_regs
*regs
= tsk
->thread
.regs
;
919 if (!cpu_has_feature(CPU_FTR_PPC_LE
) &&
920 !cpu_has_feature(CPU_FTR_REAL_LE
))
926 if (regs
->msr
& MSR_LE
) {
927 if (cpu_has_feature(CPU_FTR_REAL_LE
))
928 val
= PR_ENDIAN_LITTLE
;
930 val
= PR_ENDIAN_PPC_LITTLE
;
934 return put_user(val
, (unsigned int __user
*)adr
);
937 int set_unalign_ctl(struct task_struct
*tsk
, unsigned int val
)
939 tsk
->thread
.align_ctl
= val
;
943 int get_unalign_ctl(struct task_struct
*tsk
, unsigned long adr
)
945 return put_user(tsk
->thread
.align_ctl
, (unsigned int __user
*)adr
);
948 #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff))
950 int sys_clone(unsigned long clone_flags
, unsigned long usp
,
951 int __user
*parent_tidp
, void __user
*child_threadptr
,
952 int __user
*child_tidp
, int p6
,
953 struct pt_regs
*regs
)
955 CHECK_FULL_REGS(regs
);
957 usp
= regs
->gpr
[1]; /* stack pointer for child */
959 if (test_thread_flag(TIF_32BIT
)) {
960 parent_tidp
= TRUNC_PTR(parent_tidp
);
961 child_tidp
= TRUNC_PTR(child_tidp
);
964 return do_fork(clone_flags
, usp
, regs
, 0, parent_tidp
, child_tidp
);
967 int sys_fork(unsigned long p1
, unsigned long p2
, unsigned long p3
,
968 unsigned long p4
, unsigned long p5
, unsigned long p6
,
969 struct pt_regs
*regs
)
971 CHECK_FULL_REGS(regs
);
972 return do_fork(SIGCHLD
, regs
->gpr
[1], regs
, 0, NULL
, NULL
);
975 int sys_vfork(unsigned long p1
, unsigned long p2
, unsigned long p3
,
976 unsigned long p4
, unsigned long p5
, unsigned long p6
,
977 struct pt_regs
*regs
)
979 CHECK_FULL_REGS(regs
);
980 return do_fork(CLONE_VFORK
| CLONE_VM
| SIGCHLD
, regs
->gpr
[1],
981 regs
, 0, NULL
, NULL
);
984 int sys_execve(unsigned long a0
, unsigned long a1
, unsigned long a2
,
985 unsigned long a3
, unsigned long a4
, unsigned long a5
,
986 struct pt_regs
*regs
)
991 filename
= getname((char __user
*) a0
);
992 error
= PTR_ERR(filename
);
993 if (IS_ERR(filename
))
995 flush_fp_to_thread(current
);
996 flush_altivec_to_thread(current
);
997 flush_spe_to_thread(current
);
998 error
= do_execve(filename
, (char __user
* __user
*) a1
,
999 (char __user
* __user
*) a2
, regs
);
1005 #ifdef CONFIG_IRQSTACKS
1006 static inline int valid_irq_stack(unsigned long sp
, struct task_struct
*p
,
1007 unsigned long nbytes
)
1009 unsigned long stack_page
;
1010 unsigned long cpu
= task_cpu(p
);
1013 * Avoid crashing if the stack has overflowed and corrupted
1014 * task_cpu(p), which is in the thread_info struct.
1016 if (cpu
< NR_CPUS
&& cpu_possible(cpu
)) {
1017 stack_page
= (unsigned long) hardirq_ctx
[cpu
];
1018 if (sp
>= stack_page
+ sizeof(struct thread_struct
)
1019 && sp
<= stack_page
+ THREAD_SIZE
- nbytes
)
1022 stack_page
= (unsigned long) softirq_ctx
[cpu
];
1023 if (sp
>= stack_page
+ sizeof(struct thread_struct
)
1024 && sp
<= stack_page
+ THREAD_SIZE
- nbytes
)
1031 #define valid_irq_stack(sp, p, nb) 0
1032 #endif /* CONFIG_IRQSTACKS */
1034 int validate_sp(unsigned long sp
, struct task_struct
*p
,
1035 unsigned long nbytes
)
1037 unsigned long stack_page
= (unsigned long)task_stack_page(p
);
1039 if (sp
>= stack_page
+ sizeof(struct thread_struct
)
1040 && sp
<= stack_page
+ THREAD_SIZE
- nbytes
)
1043 return valid_irq_stack(sp
, p
, nbytes
);
1046 EXPORT_SYMBOL(validate_sp
);
1048 unsigned long get_wchan(struct task_struct
*p
)
1050 unsigned long ip
, sp
;
1053 if (!p
|| p
== current
|| p
->state
== TASK_RUNNING
)
1057 if (!validate_sp(sp
, p
, STACK_FRAME_OVERHEAD
))
1061 sp
= *(unsigned long *)sp
;
1062 if (!validate_sp(sp
, p
, STACK_FRAME_OVERHEAD
))
1065 ip
= ((unsigned long *)sp
)[STACK_FRAME_LR_SAVE
];
1066 if (!in_sched_functions(ip
))
1069 } while (count
++ < 16);
1073 static int kstack_depth_to_print
= CONFIG_PRINT_STACK_DEPTH
;
1075 void show_stack(struct task_struct
*tsk
, unsigned long *stack
)
1077 unsigned long sp
, ip
, lr
, newsp
;
1080 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1081 int curr_frame
= current
->curr_ret_stack
;
1082 extern void return_to_handler(void);
1083 unsigned long rth
= (unsigned long)return_to_handler
;
1084 unsigned long mrth
= -1;
1086 extern void mod_return_to_handler(void);
1087 rth
= *(unsigned long *)rth
;
1088 mrth
= (unsigned long)mod_return_to_handler
;
1089 mrth
= *(unsigned long *)mrth
;
1093 sp
= (unsigned long) stack
;
1098 asm("mr %0,1" : "=r" (sp
));
1100 sp
= tsk
->thread
.ksp
;
1104 printk("Call Trace:\n");
1106 if (!validate_sp(sp
, tsk
, STACK_FRAME_OVERHEAD
))
1109 stack
= (unsigned long *) sp
;
1111 ip
= stack
[STACK_FRAME_LR_SAVE
];
1112 if (!firstframe
|| ip
!= lr
) {
1113 printk("["REG
"] ["REG
"] %pS", sp
, ip
, (void *)ip
);
1114 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1115 if ((ip
== rth
|| ip
== mrth
) && curr_frame
>= 0) {
1117 (void *)current
->ret_stack
[curr_frame
].ret
);
1122 printk(" (unreliable)");
1128 * See if this is an exception frame.
1129 * We look for the "regshere" marker in the current frame.
1131 if (validate_sp(sp
, tsk
, STACK_INT_FRAME_SIZE
)
1132 && stack
[STACK_FRAME_MARKER
] == STACK_FRAME_REGS_MARKER
) {
1133 struct pt_regs
*regs
= (struct pt_regs
*)
1134 (sp
+ STACK_FRAME_OVERHEAD
);
1136 printk("--- Exception: %lx at %pS\n LR = %pS\n",
1137 regs
->trap
, (void *)regs
->nip
, (void *)lr
);
1142 } while (count
++ < kstack_depth_to_print
);
1145 void dump_stack(void)
1147 show_stack(current
, NULL
);
1149 EXPORT_SYMBOL(dump_stack
);
1152 void ppc64_runlatch_on(void)
1156 if (cpu_has_feature(CPU_FTR_CTRL
) && !test_thread_flag(TIF_RUNLATCH
)) {
1159 ctrl
= mfspr(SPRN_CTRLF
);
1160 ctrl
|= CTRL_RUNLATCH
;
1161 mtspr(SPRN_CTRLT
, ctrl
);
1163 set_thread_flag(TIF_RUNLATCH
);
1167 void ppc64_runlatch_off(void)
1171 if (cpu_has_feature(CPU_FTR_CTRL
) && test_thread_flag(TIF_RUNLATCH
)) {
1174 clear_thread_flag(TIF_RUNLATCH
);
1176 ctrl
= mfspr(SPRN_CTRLF
);
1177 ctrl
&= ~CTRL_RUNLATCH
;
1178 mtspr(SPRN_CTRLT
, ctrl
);
1183 #if THREAD_SHIFT < PAGE_SHIFT
1185 static struct kmem_cache
*thread_info_cache
;
1187 struct thread_info
*alloc_thread_info(struct task_struct
*tsk
)
1189 struct thread_info
*ti
;
1191 ti
= kmem_cache_alloc(thread_info_cache
, GFP_KERNEL
);
1192 if (unlikely(ti
== NULL
))
1194 #ifdef CONFIG_DEBUG_STACK_USAGE
1195 memset(ti
, 0, THREAD_SIZE
);
1200 void free_thread_info(struct thread_info
*ti
)
1202 kmem_cache_free(thread_info_cache
, ti
);
1205 void thread_info_cache_init(void)
1207 thread_info_cache
= kmem_cache_create("thread_info", THREAD_SIZE
,
1208 THREAD_SIZE
, 0, NULL
);
1209 BUG_ON(thread_info_cache
== NULL
);
1212 #endif /* THREAD_SHIFT < PAGE_SHIFT */
1214 unsigned long arch_align_stack(unsigned long sp
)
1216 if (!(current
->personality
& ADDR_NO_RANDOMIZE
) && randomize_va_space
)
1217 sp
-= get_random_int() & ~PAGE_MASK
;
1221 static inline unsigned long brk_rnd(void)
1223 unsigned long rnd
= 0;
1225 /* 8MB for 32bit, 1GB for 64bit */
1226 if (is_32bit_task())
1227 rnd
= (long)(get_random_int() % (1<<(23-PAGE_SHIFT
)));
1229 rnd
= (long)(get_random_int() % (1<<(30-PAGE_SHIFT
)));
1231 return rnd
<< PAGE_SHIFT
;
1234 unsigned long arch_randomize_brk(struct mm_struct
*mm
)
1236 unsigned long base
= mm
->brk
;
1239 #ifdef CONFIG_PPC_STD_MMU_64
1241 * If we are using 1TB segments and we are allowed to randomise
1242 * the heap, we can put it above 1TB so it is backed by a 1TB
1243 * segment. Otherwise the heap will be in the bottom 1TB
1244 * which always uses 256MB segments and this may result in a
1245 * performance penalty.
1247 if (!is_32bit_task() && (mmu_highuser_ssize
== MMU_SEGSIZE_1T
))
1248 base
= max_t(unsigned long, mm
->brk
, 1UL << SID_SHIFT_1T
);
1251 ret
= PAGE_ALIGN(base
+ brk_rnd());
1259 unsigned long randomize_et_dyn(unsigned long base
)
1261 unsigned long ret
= PAGE_ALIGN(base
+ brk_rnd());
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