2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1994 - 1999, 2000 by Ralf Baechle and others.
7 * Copyright (C) 2005, 2006 by Ralf Baechle (ralf@linux-mips.org)
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9 * Copyright (C) 2004 Thiemo Seufer
10 * Copyright (C) 2013 Imagination Technologies Ltd.
12 #include <linux/cpu.h>
13 #include <linux/errno.h>
14 #include <linux/init.h>
15 #include <linux/kallsyms.h>
16 #include <linux/kernel.h>
17 #include <linux/nmi.h>
18 #include <linux/personality.h>
19 #include <linux/prctl.h>
20 #include <linux/random.h>
21 #include <linux/sched.h>
22 #include <linux/sched/debug.h>
23 #include <linux/sched/task_stack.h>
27 #include <asm/dsemul.h>
33 #include <asm/irq_regs.h>
34 #include <asm/isadep.h>
36 #include <asm/mips-cps.h>
37 #include <asm/mipsregs.h>
38 #include <asm/processor.h>
40 #include <asm/stacktrace.h>
42 #ifdef CONFIG_HOTPLUG_CPU
43 void __noreturn
arch_cpu_idle_dead(void)
49 asmlinkage
void ret_from_fork(void);
50 asmlinkage
void ret_from_kernel_thread(void);
52 void start_thread(struct pt_regs
* regs
, unsigned long pc
, unsigned long sp
)
56 /* New thread loses kernel privileges. */
57 status
= regs
->cp0_status
& ~(ST0_CU0
|ST0_CU1
|ST0_CU2
|ST0_FR
|KU_MASK
);
59 regs
->cp0_status
= status
;
61 clear_thread_flag(TIF_MSA_CTX_LIVE
);
63 #ifdef CONFIG_MIPS_FP_SUPPORT
64 atomic_set(¤t
->thread
.bd_emu_frame
, BD_EMUFRAME_NONE
);
71 void exit_thread(struct task_struct
*tsk
)
74 * User threads may have allocated a delay slot emulation frame.
75 * If so, clean up that allocation.
77 if (!(current
->flags
& PF_KTHREAD
))
78 dsemul_thread_cleanup(tsk
);
81 int arch_dup_task_struct(struct task_struct
*dst
, struct task_struct
*src
)
84 * Save any process state which is live in hardware registers to the
85 * parent context prior to duplication. This prevents the new child
86 * state becoming stale if the parent is preempted before copy_thread()
87 * gets a chance to save the parent's live hardware registers to the
94 else if (is_fpu_owner())
106 * Copy architecture-specific thread state
108 int copy_thread(struct task_struct
*p
, const struct kernel_clone_args
*args
)
110 unsigned long clone_flags
= args
->flags
;
111 unsigned long usp
= args
->stack
;
112 unsigned long tls
= args
->tls
;
113 struct thread_info
*ti
= task_thread_info(p
);
114 struct pt_regs
*childregs
, *regs
= current_pt_regs();
115 unsigned long childksp
;
117 childksp
= (unsigned long)task_stack_page(p
) + THREAD_SIZE
- 32;
119 /* set up new TSS. */
120 childregs
= (struct pt_regs
*) childksp
- 1;
121 /* Put the stack after the struct pt_regs. */
122 childksp
= (unsigned long) childregs
;
123 p
->thread
.cp0_status
= (read_c0_status() & ~(ST0_CU2
|ST0_CU1
)) | ST0_KERNEL_CUMASK
;
124 if (unlikely(args
->fn
)) {
126 unsigned long status
= p
->thread
.cp0_status
;
127 memset(childregs
, 0, sizeof(struct pt_regs
));
128 p
->thread
.reg16
= (unsigned long)args
->fn
;
129 p
->thread
.reg17
= (unsigned long)args
->fn_arg
;
130 p
->thread
.reg29
= childksp
;
131 p
->thread
.reg31
= (unsigned long) ret_from_kernel_thread
;
132 #if defined(CONFIG_CPU_R3000)
133 status
= (status
& ~(ST0_KUP
| ST0_IEP
| ST0_IEC
)) |
134 ((status
& (ST0_KUC
| ST0_IEC
)) << 2);
138 childregs
->cp0_status
= status
;
144 childregs
->regs
[7] = 0; /* Clear error flag */
145 childregs
->regs
[2] = 0; /* Child gets zero as return value */
147 childregs
->regs
[29] = usp
;
149 p
->thread
.reg29
= (unsigned long) childregs
;
150 p
->thread
.reg31
= (unsigned long) ret_from_fork
;
153 * New tasks lose permission to use the fpu. This accelerates context
154 * switching for most programs since they don't use the fpu.
156 childregs
->cp0_status
&= ~(ST0_CU2
|ST0_CU1
);
158 clear_tsk_thread_flag(p
, TIF_USEDFPU
);
159 clear_tsk_thread_flag(p
, TIF_USEDMSA
);
160 clear_tsk_thread_flag(p
, TIF_MSA_CTX_LIVE
);
162 #ifdef CONFIG_MIPS_MT_FPAFF
163 clear_tsk_thread_flag(p
, TIF_FPUBOUND
);
164 #endif /* CONFIG_MIPS_MT_FPAFF */
166 #ifdef CONFIG_MIPS_FP_SUPPORT
167 atomic_set(&p
->thread
.bd_emu_frame
, BD_EMUFRAME_NONE
);
170 if (clone_flags
& CLONE_SETTLS
)
176 #ifdef CONFIG_STACKPROTECTOR
177 #include <linux/stackprotector.h>
178 unsigned long __stack_chk_guard __read_mostly
;
179 EXPORT_SYMBOL(__stack_chk_guard
);
182 struct mips_frame_info
{
184 unsigned long func_size
;
189 #define J_TARGET(pc,target) \
190 (((unsigned long)(pc) & 0xf0000000) | ((target) << 2))
192 static inline int is_jr_ra_ins(union mips_instruction
*ip
)
194 #ifdef CONFIG_CPU_MICROMIPS
199 if (mm_insn_16bit(ip
->word
>> 16)) {
200 if (ip
->mm16_r5_format
.opcode
== mm_pool16c_op
&&
201 ip
->mm16_r5_format
.rt
== mm_jr16_op
&&
202 ip
->mm16_r5_format
.imm
== 31)
207 if (ip
->r_format
.opcode
== mm_pool32a_op
&&
208 ip
->r_format
.func
== mm_pool32axf_op
&&
209 ((ip
->u_format
.uimmediate
>> 6) & GENMASK(9, 0)) == mm_jalr_op
&&
210 ip
->r_format
.rt
== 31)
214 if (ip
->r_format
.opcode
== spec_op
&&
215 ip
->r_format
.func
== jr_op
&&
216 ip
->r_format
.rs
== 31)
222 static inline int is_ra_save_ins(union mips_instruction
*ip
, int *poff
)
224 #ifdef CONFIG_CPU_MICROMIPS
227 * swm16 reglist,offset(sp)
228 * swm32 reglist,offset(sp)
230 * jradiussp - NOT SUPPORTED
232 * microMIPS is way more fun...
234 if (mm_insn_16bit(ip
->word
>> 16)) {
235 switch (ip
->mm16_r5_format
.opcode
) {
237 if (ip
->mm16_r5_format
.rt
!= 31)
240 *poff
= ip
->mm16_r5_format
.imm
;
241 *poff
= (*poff
<< 2) / sizeof(ulong
);
245 switch (ip
->mm16_m_format
.func
) {
247 *poff
= ip
->mm16_m_format
.imm
;
248 *poff
+= 1 + ip
->mm16_m_format
.rlist
;
249 *poff
= (*poff
<< 2) / sizeof(ulong
);
261 switch (ip
->i_format
.opcode
) {
263 if (ip
->i_format
.rs
!= 29)
265 if (ip
->i_format
.rt
!= 31)
268 *poff
= ip
->i_format
.simmediate
/ sizeof(ulong
);
272 switch (ip
->mm_m_format
.func
) {
274 if (ip
->mm_m_format
.rd
< 0x10)
276 if (ip
->mm_m_format
.base
!= 29)
279 *poff
= ip
->mm_m_format
.simmediate
;
280 *poff
+= (ip
->mm_m_format
.rd
& 0xf) * sizeof(u32
);
281 *poff
/= sizeof(ulong
);
291 /* sw / sd $ra, offset($sp) */
292 if ((ip
->i_format
.opcode
== sw_op
|| ip
->i_format
.opcode
== sd_op
) &&
293 ip
->i_format
.rs
== 29 && ip
->i_format
.rt
== 31) {
294 *poff
= ip
->i_format
.simmediate
/ sizeof(ulong
);
297 #ifdef CONFIG_CPU_LOONGSON64
298 if ((ip
->loongson3_lswc2_format
.opcode
== swc2_op
) &&
299 (ip
->loongson3_lswc2_format
.ls
== 1) &&
300 (ip
->loongson3_lswc2_format
.fr
== 0) &&
301 (ip
->loongson3_lswc2_format
.base
== 29)) {
302 if (ip
->loongson3_lswc2_format
.rt
== 31) {
303 *poff
= ip
->loongson3_lswc2_format
.offset
<< 1;
306 if (ip
->loongson3_lswc2_format
.rq
== 31) {
307 *poff
= (ip
->loongson3_lswc2_format
.offset
<< 1) + 1;
316 static inline int is_jump_ins(union mips_instruction
*ip
)
318 #ifdef CONFIG_CPU_MICROMIPS
320 * jr16,jrc,jalr16,jalr16
322 * jalr/jr,jalr.hb/jr.hb,jalrs,jalrs.hb
323 * jraddiusp - NOT SUPPORTED
325 * microMIPS is kind of more fun...
327 if (mm_insn_16bit(ip
->word
>> 16)) {
328 if ((ip
->mm16_r5_format
.opcode
== mm_pool16c_op
&&
329 (ip
->mm16_r5_format
.rt
& mm_jr16_op
) == mm_jr16_op
))
334 if (ip
->j_format
.opcode
== mm_j32_op
)
336 if (ip
->j_format
.opcode
== mm_jal32_op
)
338 if (ip
->r_format
.opcode
!= mm_pool32a_op
||
339 ip
->r_format
.func
!= mm_pool32axf_op
)
341 return ((ip
->u_format
.uimmediate
>> 6) & mm_jalr_op
) == mm_jalr_op
;
343 if (ip
->j_format
.opcode
== j_op
)
345 if (ip
->j_format
.opcode
== jal_op
)
347 if (ip
->r_format
.opcode
!= spec_op
)
349 return ip
->r_format
.func
== jalr_op
|| ip
->r_format
.func
== jr_op
;
353 static inline int is_sp_move_ins(union mips_instruction
*ip
, int *frame_size
)
355 #ifdef CONFIG_CPU_MICROMIPS
362 * jradiussp - NOT SUPPORTED
364 * microMIPS is not more fun...
366 if (mm_insn_16bit(ip
->word
>> 16)) {
367 if (ip
->mm16_r3_format
.opcode
== mm_pool16d_op
&&
368 ip
->mm16_r3_format
.simmediate
& mm_addiusp_func
) {
369 tmp
= ip
->mm_b0_format
.simmediate
>> 1;
370 tmp
= ((tmp
& 0x1ff) ^ 0x100) - 0x100;
371 if ((tmp
+ 2) < 4) /* 0x0,0x1,0x1fe,0x1ff are special */
373 *frame_size
= -(signed short)(tmp
<< 2);
376 if (ip
->mm16_r5_format
.opcode
== mm_pool16d_op
&&
377 ip
->mm16_r5_format
.rt
== 29) {
378 tmp
= ip
->mm16_r5_format
.imm
>> 1;
379 *frame_size
= -(signed short)(tmp
& 0xf);
385 if (ip
->mm_i_format
.opcode
== mm_addiu32_op
&&
386 ip
->mm_i_format
.rt
== 29 && ip
->mm_i_format
.rs
== 29) {
387 *frame_size
= -ip
->i_format
.simmediate
;
391 /* addiu/daddiu sp,sp,-imm */
392 if (ip
->i_format
.rs
!= 29 || ip
->i_format
.rt
!= 29)
395 if (ip
->i_format
.opcode
== addiu_op
||
396 ip
->i_format
.opcode
== daddiu_op
) {
397 *frame_size
= -ip
->i_format
.simmediate
;
404 static int get_frame_info(struct mips_frame_info
*info
)
406 bool is_mmips
= IS_ENABLED(CONFIG_CPU_MICROMIPS
);
407 union mips_instruction insn
, *ip
, *ip_end
;
408 unsigned int last_insn_size
= 0;
409 bool saw_jump
= false;
411 info
->pc_offset
= -1;
412 info
->frame_size
= 0;
414 ip
= (void *)msk_isa16_mode((ulong
)info
->func
);
418 ip_end
= (void *)ip
+ (info
->func_size
? info
->func_size
: 512);
420 while (ip
< ip_end
) {
421 ip
= (void *)ip
+ last_insn_size
;
423 if (is_mmips
&& mm_insn_16bit(ip
->halfword
[0])) {
424 insn
.word
= ip
->halfword
[0] << 16;
426 } else if (is_mmips
) {
427 insn
.word
= ip
->halfword
[0] << 16 | ip
->halfword
[1];
430 insn
.word
= ip
->word
;
434 if (is_jr_ra_ins(ip
)) {
436 } else if (!info
->frame_size
) {
437 is_sp_move_ins(&insn
, &info
->frame_size
);
439 } else if (!saw_jump
&& is_jump_ins(ip
)) {
441 * If we see a jump instruction, we are finished
442 * with the frame save.
444 * Some functions can have a shortcut return at
445 * the beginning of the function, so don't start
446 * looking for jump instruction until we see the
449 * The RA save instruction can get put into the
450 * delay slot of the jump instruction, so look
451 * at the next instruction, too.
456 if (info
->pc_offset
== -1 &&
457 is_ra_save_ins(&insn
, &info
->pc_offset
))
462 if (info
->frame_size
&& info
->pc_offset
>= 0) /* nested */
464 if (info
->pc_offset
< 0) /* leaf */
466 /* prologue seems bogus... */
471 static struct mips_frame_info schedule_mfi __read_mostly
;
473 #ifdef CONFIG_KALLSYMS
474 static unsigned long get___schedule_addr(void)
476 return kallsyms_lookup_name("__schedule");
479 static unsigned long get___schedule_addr(void)
481 union mips_instruction
*ip
= (void *)schedule
;
485 for (i
= 0; i
< max_insns
; i
++, ip
++) {
486 if (ip
->j_format
.opcode
== j_op
)
487 return J_TARGET(ip
, ip
->j_format
.target
);
493 static int __init
frame_info_init(void)
495 unsigned long size
= 0;
496 #ifdef CONFIG_KALLSYMS
501 addr
= get___schedule_addr();
503 addr
= (unsigned long)schedule
;
505 #ifdef CONFIG_KALLSYMS
506 kallsyms_lookup_size_offset(addr
, &size
, &ofs
);
508 schedule_mfi
.func
= (void *)addr
;
509 schedule_mfi
.func_size
= size
;
511 get_frame_info(&schedule_mfi
);
514 * Without schedule() frame info, result given by
515 * thread_saved_pc() and __get_wchan() are not reliable.
517 if (schedule_mfi
.pc_offset
< 0)
518 printk("Can't analyze schedule() prologue at %p\n", schedule
);
523 arch_initcall(frame_info_init
);
526 * Return saved PC of a blocked thread.
528 static unsigned long thread_saved_pc(struct task_struct
*tsk
)
530 struct thread_struct
*t
= &tsk
->thread
;
532 /* New born processes are a special case */
533 if (t
->reg31
== (unsigned long) ret_from_fork
)
535 if (schedule_mfi
.pc_offset
< 0)
537 return ((unsigned long *)t
->reg29
)[schedule_mfi
.pc_offset
];
541 #ifdef CONFIG_KALLSYMS
542 /* generic stack unwinding function */
543 unsigned long notrace
unwind_stack_by_address(unsigned long stack_page
,
548 unsigned long low
, high
, irq_stack_high
;
549 struct mips_frame_info info
;
550 unsigned long size
, ofs
;
551 struct pt_regs
*regs
;
558 * IRQ stacks start at IRQ_STACK_START
559 * task stacks at THREAD_SIZE - 32
562 if (!preemptible() && on_irq_stack(raw_smp_processor_id(), *sp
)) {
563 high
= stack_page
+ IRQ_STACK_START
;
564 irq_stack_high
= high
;
566 high
= stack_page
+ THREAD_SIZE
- 32;
571 * If we reached the top of the interrupt stack, start unwinding
572 * the interrupted task stack.
574 if (unlikely(*sp
== irq_stack_high
)) {
575 unsigned long task_sp
= *(unsigned long *)*sp
;
578 * Check that the pointer saved in the IRQ stack head points to
579 * something within the stack of the current task
581 if (!object_is_on_stack((void *)task_sp
))
585 * Follow pointer to tasks kernel stack frame where interrupted
588 regs
= (struct pt_regs
*)task_sp
;
590 if (!user_mode(regs
) && __kernel_text_address(pc
)) {
591 *sp
= regs
->regs
[29];
592 *ra
= regs
->regs
[31];
597 if (!kallsyms_lookup_size_offset(pc
, &size
, &ofs
))
600 * Return ra if an exception occurred at the first instruction
602 if (unlikely(ofs
== 0)) {
608 info
.func
= (void *)(pc
- ofs
);
609 info
.func_size
= ofs
; /* analyze from start to ofs */
610 leaf
= get_frame_info(&info
);
614 if (*sp
< low
|| *sp
+ info
.frame_size
> high
)
619 * For some extreme cases, get_frame_info() can
620 * consider wrongly a nested function as a leaf
621 * one. In that cases avoid to return always the
624 pc
= pc
!= *ra
? *ra
: 0;
626 pc
= ((unsigned long *)(*sp
))[info
.pc_offset
];
628 *sp
+= info
.frame_size
;
630 return __kernel_text_address(pc
) ? pc
: 0;
632 EXPORT_SYMBOL(unwind_stack_by_address
);
634 /* used by show_backtrace() */
635 unsigned long unwind_stack(struct task_struct
*task
, unsigned long *sp
,
636 unsigned long pc
, unsigned long *ra
)
638 unsigned long stack_page
= 0;
641 for_each_possible_cpu(cpu
) {
642 if (on_irq_stack(cpu
, *sp
)) {
643 stack_page
= (unsigned long)irq_stack
[cpu
];
649 stack_page
= (unsigned long)task_stack_page(task
);
651 return unwind_stack_by_address(stack_page
, sp
, pc
, ra
);
656 * __get_wchan - a maintenance nightmare^W^Wpain in the ass ...
658 unsigned long __get_wchan(struct task_struct
*task
)
660 unsigned long pc
= 0;
661 #ifdef CONFIG_KALLSYMS
663 unsigned long ra
= 0;
666 if (!task_stack_page(task
))
669 pc
= thread_saved_pc(task
);
671 #ifdef CONFIG_KALLSYMS
672 sp
= task
->thread
.reg29
+ schedule_mfi
.frame_size
;
674 while (in_sched_functions(pc
))
675 pc
= unwind_stack(task
, &sp
, pc
, &ra
);
682 unsigned long mips_stack_top(void)
684 unsigned long top
= TASK_SIZE
& PAGE_MASK
;
686 if (IS_ENABLED(CONFIG_MIPS_FP_SUPPORT
)) {
687 /* One page for branch delay slot "emulation" */
691 /* Space for the VDSO, data page & GIC user page */
692 top
-= PAGE_ALIGN(current
->thread
.abi
->vdso
->size
);
694 top
-= mips_gic_present() ? PAGE_SIZE
: 0;
696 /* Space for cache colour alignment */
697 if (cpu_has_dc_aliases
)
698 top
-= shm_align_mask
+ 1;
700 /* Space to randomize the VDSO base */
701 if (current
->flags
& PF_RANDOMIZE
)
702 top
-= VDSO_RANDOMIZE_SIZE
;
708 * Don't forget that the stack pointer must be aligned on a 8 bytes
709 * boundary for 32-bits ABI and 16 bytes for 64-bits ABI.
711 unsigned long arch_align_stack(unsigned long sp
)
713 if (!(current
->personality
& ADDR_NO_RANDOMIZE
) && randomize_va_space
)
714 sp
-= get_random_u32_below(PAGE_SIZE
);
719 static struct cpumask backtrace_csd_busy
;
721 static void handle_backtrace(void *info
)
723 nmi_cpu_backtrace(get_irq_regs());
724 cpumask_clear_cpu(smp_processor_id(), &backtrace_csd_busy
);
727 static DEFINE_PER_CPU(call_single_data_t
, backtrace_csd
) =
728 CSD_INIT(handle_backtrace
, NULL
);
730 static void raise_backtrace(cpumask_t
*mask
)
732 call_single_data_t
*csd
;
735 for_each_cpu(cpu
, mask
) {
737 * If we previously sent an IPI to the target CPU & it hasn't
738 * cleared its bit in the busy cpumask then it didn't handle
739 * our previous IPI & it's not safe for us to reuse the
740 * call_single_data_t.
742 if (cpumask_test_and_set_cpu(cpu
, &backtrace_csd_busy
)) {
743 pr_warn("Unable to send backtrace IPI to CPU%u - perhaps it hung?\n",
748 csd
= &per_cpu(backtrace_csd
, cpu
);
749 smp_call_function_single_async(cpu
, csd
);
753 void arch_trigger_cpumask_backtrace(const cpumask_t
*mask
, int exclude_cpu
)
755 nmi_trigger_cpumask_backtrace(mask
, exclude_cpu
, raise_backtrace
);
758 int mips_get_process_fp_mode(struct task_struct
*task
)
762 if (!test_tsk_thread_flag(task
, TIF_32BIT_FPREGS
))
763 value
|= PR_FP_MODE_FR
;
764 if (test_tsk_thread_flag(task
, TIF_HYBRID_FPREGS
))
765 value
|= PR_FP_MODE_FRE
;
770 static long prepare_for_fp_mode_switch(void *unused
)
773 * This is icky, but we use this to simply ensure that all CPUs have
774 * context switched, regardless of whether they were previously running
775 * kernel or user code. This ensures that no CPU that a mode-switching
776 * program may execute on keeps its FPU enabled (& in the old mode)
777 * throughout the mode switch.
782 int mips_set_process_fp_mode(struct task_struct
*task
, unsigned int value
)
784 const unsigned int known_bits
= PR_FP_MODE_FR
| PR_FP_MODE_FRE
;
785 struct task_struct
*t
;
786 struct cpumask process_cpus
;
789 /* If nothing to change, return right away, successfully. */
790 if (value
== mips_get_process_fp_mode(task
))
793 /* Only accept a mode change if 64-bit FP enabled for o32. */
794 if (!IS_ENABLED(CONFIG_MIPS_O32_FP64_SUPPORT
))
797 /* And only for o32 tasks. */
798 if (IS_ENABLED(CONFIG_64BIT
) && !test_thread_flag(TIF_32BIT_REGS
))
801 /* Check the value is valid */
802 if (value
& ~known_bits
)
805 /* Setting FRE without FR is not supported. */
806 if ((value
& (PR_FP_MODE_FR
| PR_FP_MODE_FRE
)) == PR_FP_MODE_FRE
)
809 /* Avoid inadvertently triggering emulation */
810 if ((value
& PR_FP_MODE_FR
) && raw_cpu_has_fpu
&&
811 !(raw_current_cpu_data
.fpu_id
& MIPS_FPIR_F64
))
813 if ((value
& PR_FP_MODE_FRE
) && raw_cpu_has_fpu
&& !cpu_has_fre
)
816 /* FR = 0 not supported in MIPS R6 */
817 if (!(value
& PR_FP_MODE_FR
) && raw_cpu_has_fpu
&& cpu_has_mips_r6
)
820 /* Indicate the new FP mode in each thread */
821 for_each_thread(task
, t
) {
822 /* Update desired FP register width */
823 if (value
& PR_FP_MODE_FR
) {
824 clear_tsk_thread_flag(t
, TIF_32BIT_FPREGS
);
826 set_tsk_thread_flag(t
, TIF_32BIT_FPREGS
);
827 clear_tsk_thread_flag(t
, TIF_MSA_CTX_LIVE
);
830 /* Update desired FP single layout */
831 if (value
& PR_FP_MODE_FRE
)
832 set_tsk_thread_flag(t
, TIF_HYBRID_FPREGS
);
834 clear_tsk_thread_flag(t
, TIF_HYBRID_FPREGS
);
838 * We need to ensure that all threads in the process have switched mode
839 * before returning, in order to allow userland to not worry about
840 * races. We can do this by forcing all CPUs that any thread in the
841 * process may be running on to schedule something else - in this case
842 * prepare_for_fp_mode_switch().
844 * We begin by generating a mask of all CPUs that any thread in the
845 * process may be running on.
847 cpumask_clear(&process_cpus
);
848 for_each_thread(task
, t
)
849 cpumask_set_cpu(task_cpu(t
), &process_cpus
);
852 * Now we schedule prepare_for_fp_mode_switch() on each of those CPUs.
854 * The CPUs may have rescheduled already since we switched mode or
855 * generated the cpumask, but that doesn't matter. If the task in this
856 * process is scheduled out then our scheduling
857 * prepare_for_fp_mode_switch() will simply be redundant. If it's
858 * scheduled in then it will already have picked up the new FP mode
862 for_each_cpu_and(cpu
, &process_cpus
, cpu_online_mask
)
863 work_on_cpu(cpu
, prepare_for_fp_mode_switch
, NULL
);
869 #if defined(CONFIG_32BIT) || defined(CONFIG_MIPS32_O32)
870 void mips_dump_regs32(u32
*uregs
, const struct pt_regs
*regs
)
874 for (i
= MIPS32_EF_R1
; i
<= MIPS32_EF_R31
; i
++) {
875 /* k0/k1 are copied as zero. */
876 if (i
== MIPS32_EF_R26
|| i
== MIPS32_EF_R27
)
879 uregs
[i
] = regs
->regs
[i
- MIPS32_EF_R0
];
882 uregs
[MIPS32_EF_LO
] = regs
->lo
;
883 uregs
[MIPS32_EF_HI
] = regs
->hi
;
884 uregs
[MIPS32_EF_CP0_EPC
] = regs
->cp0_epc
;
885 uregs
[MIPS32_EF_CP0_BADVADDR
] = regs
->cp0_badvaddr
;
886 uregs
[MIPS32_EF_CP0_STATUS
] = regs
->cp0_status
;
887 uregs
[MIPS32_EF_CP0_CAUSE
] = regs
->cp0_cause
;
889 #endif /* CONFIG_32BIT || CONFIG_MIPS32_O32 */
892 void mips_dump_regs64(u64
*uregs
, const struct pt_regs
*regs
)
896 for (i
= MIPS64_EF_R1
; i
<= MIPS64_EF_R31
; i
++) {
897 /* k0/k1 are copied as zero. */
898 if (i
== MIPS64_EF_R26
|| i
== MIPS64_EF_R27
)
901 uregs
[i
] = regs
->regs
[i
- MIPS64_EF_R0
];
904 uregs
[MIPS64_EF_LO
] = regs
->lo
;
905 uregs
[MIPS64_EF_HI
] = regs
->hi
;
906 uregs
[MIPS64_EF_CP0_EPC
] = regs
->cp0_epc
;
907 uregs
[MIPS64_EF_CP0_BADVADDR
] = regs
->cp0_badvaddr
;
908 uregs
[MIPS64_EF_CP0_STATUS
] = regs
->cp0_status
;
909 uregs
[MIPS64_EF_CP0_CAUSE
] = regs
->cp0_cause
;
911 #endif /* CONFIG_64BIT */