1 /* arch/sparc64/kernel/process.c
3 * Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net)
4 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
5 * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 * This file handles the architecture-dependent parts of process handling..
14 #include <linux/errno.h>
15 #include <linux/export.h>
16 #include <linux/sched.h>
17 #include <linux/sched/debug.h>
18 #include <linux/sched/task.h>
19 #include <linux/kernel.h>
22 #include <linux/smp.h>
23 #include <linux/stddef.h>
24 #include <linux/ptrace.h>
25 #include <linux/slab.h>
26 #include <linux/user.h>
27 #include <linux/delay.h>
28 #include <linux/compat.h>
29 #include <linux/tick.h>
30 #include <linux/init.h>
31 #include <linux/cpu.h>
32 #include <linux/perf_event.h>
33 #include <linux/elfcore.h>
34 #include <linux/sysrq.h>
35 #include <linux/nmi.h>
36 #include <linux/context_tracking.h>
38 #include <linux/uaccess.h>
40 #include <asm/pgalloc.h>
41 #include <asm/pgtable.h>
42 #include <asm/processor.h>
43 #include <asm/pstate.h>
45 #include <asm/fpumacro.h>
47 #include <asm/cpudata.h>
48 #include <asm/mmu_context.h>
49 #include <asm/unistd.h>
50 #include <asm/hypervisor.h>
51 #include <asm/syscalls.h>
52 #include <asm/irq_regs.h>
58 /* Idle loop support on sparc64. */
59 void arch_cpu_idle(void)
61 if (tlb_type
!= hypervisor
) {
69 /* The sun4v sleeping code requires that we have PSTATE.IE cleared over
70 * the cpu sleep hypervisor call.
73 "rdpr %%pstate, %0\n\t"
75 "wrpr %0, %%g0, %%pstate"
79 if (!need_resched() && !cpu_is_offline(smp_processor_id()))
82 /* Re-enable interrupts. */
84 "rdpr %%pstate, %0\n\t"
86 "wrpr %0, %%g0, %%pstate"
92 #ifdef CONFIG_HOTPLUG_CPU
93 void arch_cpu_idle_dead(void)
95 sched_preempt_enable_no_resched();
101 static void show_regwindow32(struct pt_regs
*regs
)
103 struct reg_window32 __user
*rw
;
104 struct reg_window32 r_w
;
107 __asm__
__volatile__ ("flushw");
108 rw
= compat_ptr((unsigned int)regs
->u_regs
[14]);
111 if (copy_from_user (&r_w
, rw
, sizeof(r_w
))) {
117 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
118 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
119 r_w
.locals
[0], r_w
.locals
[1], r_w
.locals
[2], r_w
.locals
[3],
120 r_w
.locals
[4], r_w
.locals
[5], r_w
.locals
[6], r_w
.locals
[7]);
121 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
122 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
123 r_w
.ins
[0], r_w
.ins
[1], r_w
.ins
[2], r_w
.ins
[3],
124 r_w
.ins
[4], r_w
.ins
[5], r_w
.ins
[6], r_w
.ins
[7]);
127 #define show_regwindow32(regs) do { } while (0)
130 static void show_regwindow(struct pt_regs
*regs
)
132 struct reg_window __user
*rw
;
133 struct reg_window
*rwk
;
134 struct reg_window r_w
;
137 if ((regs
->tstate
& TSTATE_PRIV
) || !(test_thread_flag(TIF_32BIT
))) {
138 __asm__
__volatile__ ("flushw");
139 rw
= (struct reg_window __user
*)
140 (regs
->u_regs
[14] + STACK_BIAS
);
141 rwk
= (struct reg_window
*)
142 (regs
->u_regs
[14] + STACK_BIAS
);
143 if (!(regs
->tstate
& TSTATE_PRIV
)) {
146 if (copy_from_user (&r_w
, rw
, sizeof(r_w
))) {
154 show_regwindow32(regs
);
157 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
158 rwk
->locals
[0], rwk
->locals
[1], rwk
->locals
[2], rwk
->locals
[3]);
159 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
160 rwk
->locals
[4], rwk
->locals
[5], rwk
->locals
[6], rwk
->locals
[7]);
161 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
162 rwk
->ins
[0], rwk
->ins
[1], rwk
->ins
[2], rwk
->ins
[3]);
163 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
164 rwk
->ins
[4], rwk
->ins
[5], rwk
->ins
[6], rwk
->ins
[7]);
165 if (regs
->tstate
& TSTATE_PRIV
)
166 printk("I7: <%pS>\n", (void *) rwk
->ins
[7]);
169 void show_regs(struct pt_regs
*regs
)
171 show_regs_print_info(KERN_DEFAULT
);
173 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs
->tstate
,
174 regs
->tpc
, regs
->tnpc
, regs
->y
, print_tainted());
175 printk("TPC: <%pS>\n", (void *) regs
->tpc
);
176 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
177 regs
->u_regs
[0], regs
->u_regs
[1], regs
->u_regs
[2],
179 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
180 regs
->u_regs
[4], regs
->u_regs
[5], regs
->u_regs
[6],
182 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
183 regs
->u_regs
[8], regs
->u_regs
[9], regs
->u_regs
[10],
185 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
186 regs
->u_regs
[12], regs
->u_regs
[13], regs
->u_regs
[14],
188 printk("RPC: <%pS>\n", (void *) regs
->u_regs
[15]);
189 show_regwindow(regs
);
190 show_stack(current
, (unsigned long *) regs
->u_regs
[UREG_FP
]);
193 union global_cpu_snapshot global_cpu_snapshot
[NR_CPUS
];
194 static DEFINE_SPINLOCK(global_cpu_snapshot_lock
);
196 static void __global_reg_self(struct thread_info
*tp
, struct pt_regs
*regs
,
199 struct global_reg_snapshot
*rp
;
203 rp
= &global_cpu_snapshot
[this_cpu
].reg
;
205 rp
->tstate
= regs
->tstate
;
207 rp
->tnpc
= regs
->tnpc
;
208 rp
->o7
= regs
->u_regs
[UREG_I7
];
210 if (regs
->tstate
& TSTATE_PRIV
) {
211 struct reg_window
*rw
;
213 rw
= (struct reg_window
*)
214 (regs
->u_regs
[UREG_FP
] + STACK_BIAS
);
215 if (kstack_valid(tp
, (unsigned long) rw
)) {
217 rw
= (struct reg_window
*)
218 (rw
->ins
[6] + STACK_BIAS
);
219 if (kstack_valid(tp
, (unsigned long) rw
))
220 rp
->rpc
= rw
->ins
[7];
229 /* In order to avoid hangs we do not try to synchronize with the
230 * global register dump client cpus. The last store they make is to
231 * the thread pointer, so do a short poll waiting for that to become
234 static void __global_reg_poll(struct global_reg_snapshot
*gp
)
238 while (!gp
->thread
&& ++limit
< 100) {
244 void arch_trigger_cpumask_backtrace(const cpumask_t
*mask
, bool exclude_self
)
246 struct thread_info
*tp
= current_thread_info();
247 struct pt_regs
*regs
= get_irq_regs();
254 spin_lock_irqsave(&global_cpu_snapshot_lock
, flags
);
256 this_cpu
= raw_smp_processor_id();
258 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
260 if (cpumask_test_cpu(this_cpu
, mask
) && !exclude_self
)
261 __global_reg_self(tp
, regs
, this_cpu
);
263 smp_fetch_global_regs();
265 for_each_cpu(cpu
, mask
) {
266 struct global_reg_snapshot
*gp
;
268 if (exclude_self
&& cpu
== this_cpu
)
271 gp
= &global_cpu_snapshot
[cpu
].reg
;
273 __global_reg_poll(gp
);
276 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
277 (cpu
== this_cpu
? '*' : ' '), cpu
,
278 gp
->tstate
, gp
->tpc
, gp
->tnpc
,
279 ((tp
&& tp
->task
) ? tp
->task
->comm
: "NULL"),
280 ((tp
&& tp
->task
) ? tp
->task
->pid
: -1));
282 if (gp
->tstate
& TSTATE_PRIV
) {
283 printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
289 printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
290 gp
->tpc
, gp
->o7
, gp
->i7
, gp
->rpc
);
293 touch_nmi_watchdog();
296 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
298 spin_unlock_irqrestore(&global_cpu_snapshot_lock
, flags
);
301 #ifdef CONFIG_MAGIC_SYSRQ
303 static void sysrq_handle_globreg(int key
)
305 trigger_all_cpu_backtrace();
308 static struct sysrq_key_op sparc_globalreg_op
= {
309 .handler
= sysrq_handle_globreg
,
310 .help_msg
= "global-regs(y)",
311 .action_msg
= "Show Global CPU Regs",
314 static void __global_pmu_self(int this_cpu
)
316 struct global_pmu_snapshot
*pp
;
322 pp
= &global_cpu_snapshot
[this_cpu
].pmu
;
325 if (tlb_type
== hypervisor
&&
326 sun4v_chip_type
>= SUN4V_CHIP_NIAGARA4
)
329 for (i
= 0; i
< num
; i
++) {
330 pp
->pcr
[i
] = pcr_ops
->read_pcr(i
);
331 pp
->pic
[i
] = pcr_ops
->read_pic(i
);
335 static void __global_pmu_poll(struct global_pmu_snapshot
*pp
)
339 while (!pp
->pcr
[0] && ++limit
< 100) {
345 static void pmu_snapshot_all_cpus(void)
350 spin_lock_irqsave(&global_cpu_snapshot_lock
, flags
);
352 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
354 this_cpu
= raw_smp_processor_id();
356 __global_pmu_self(this_cpu
);
358 smp_fetch_global_pmu();
360 for_each_online_cpu(cpu
) {
361 struct global_pmu_snapshot
*pp
= &global_cpu_snapshot
[cpu
].pmu
;
363 __global_pmu_poll(pp
);
365 printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n",
366 (cpu
== this_cpu
? '*' : ' '), cpu
,
367 pp
->pcr
[0], pp
->pcr
[1], pp
->pcr
[2], pp
->pcr
[3],
368 pp
->pic
[0], pp
->pic
[1], pp
->pic
[2], pp
->pic
[3]);
370 touch_nmi_watchdog();
373 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
375 spin_unlock_irqrestore(&global_cpu_snapshot_lock
, flags
);
378 static void sysrq_handle_globpmu(int key
)
380 pmu_snapshot_all_cpus();
383 static struct sysrq_key_op sparc_globalpmu_op
= {
384 .handler
= sysrq_handle_globpmu
,
385 .help_msg
= "global-pmu(x)",
386 .action_msg
= "Show Global PMU Regs",
389 static int __init
sparc_sysrq_init(void)
391 int ret
= register_sysrq_key('y', &sparc_globalreg_op
);
394 ret
= register_sysrq_key('x', &sparc_globalpmu_op
);
398 core_initcall(sparc_sysrq_init
);
402 unsigned long thread_saved_pc(struct task_struct
*tsk
)
404 struct thread_info
*ti
= task_thread_info(tsk
);
405 unsigned long ret
= 0xdeadbeefUL
;
409 sp
= (unsigned long *)(ti
->ksp
+ STACK_BIAS
);
410 if (((unsigned long)sp
& (sizeof(long) - 1)) == 0UL &&
413 fp
= (unsigned long *)(sp
[14] + STACK_BIAS
);
414 if (((unsigned long)fp
& (sizeof(long) - 1)) == 0UL)
421 /* Free current thread data structures etc.. */
422 void exit_thread(struct task_struct
*tsk
)
424 struct thread_info
*t
= task_thread_info(tsk
);
427 if (t
->utraps
[0] < 2)
434 void flush_thread(void)
436 struct thread_info
*t
= current_thread_info();
437 struct mm_struct
*mm
;
441 tsb_context_switch(mm
);
443 set_thread_wsaved(0);
445 /* Clear FPU register state. */
449 /* It's a bit more tricky when 64-bit tasks are involved... */
450 static unsigned long clone_stackframe(unsigned long csp
, unsigned long psp
)
452 bool stack_64bit
= test_thread_64bit_stack(psp
);
453 unsigned long fp
, distance
, rval
;
458 __get_user(fp
, &(((struct reg_window __user
*)psp
)->ins
[6]));
460 if (test_thread_flag(TIF_32BIT
))
463 __get_user(fp
, &(((struct reg_window32 __user
*)psp
)->ins
[6]));
465 /* Now align the stack as this is mandatory in the Sparc ABI
466 * due to how register windows work. This hides the
467 * restriction from thread libraries etc.
472 rval
= (csp
- distance
);
473 if (copy_in_user((void __user
*) rval
, (void __user
*) psp
, distance
))
475 else if (!stack_64bit
) {
476 if (put_user(((u32
)csp
),
477 &(((struct reg_window32 __user
*)rval
)->ins
[6])))
480 if (put_user(((u64
)csp
- STACK_BIAS
),
481 &(((struct reg_window __user
*)rval
)->ins
[6])))
484 rval
= rval
- STACK_BIAS
;
490 /* Standard stuff. */
491 static inline void shift_window_buffer(int first_win
, int last_win
,
492 struct thread_info
*t
)
496 for (i
= first_win
; i
< last_win
; i
++) {
497 t
->rwbuf_stkptrs
[i
] = t
->rwbuf_stkptrs
[i
+1];
498 memcpy(&t
->reg_window
[i
], &t
->reg_window
[i
+1],
499 sizeof(struct reg_window
));
503 void synchronize_user_stack(void)
505 struct thread_info
*t
= current_thread_info();
506 unsigned long window
;
508 flush_user_windows();
509 if ((window
= get_thread_wsaved()) != 0) {
512 struct reg_window
*rwin
= &t
->reg_window
[window
];
513 int winsize
= sizeof(struct reg_window
);
516 sp
= t
->rwbuf_stkptrs
[window
];
518 if (test_thread_64bit_stack(sp
))
521 winsize
= sizeof(struct reg_window32
);
523 if (!copy_to_user((char __user
*)sp
, rwin
, winsize
)) {
524 shift_window_buffer(window
, get_thread_wsaved() - 1, t
);
525 set_thread_wsaved(get_thread_wsaved() - 1);
531 static void stack_unaligned(unsigned long sp
)
535 info
.si_signo
= SIGBUS
;
537 info
.si_code
= BUS_ADRALN
;
538 info
.si_addr
= (void __user
*) sp
;
540 force_sig_info(SIGBUS
, &info
, current
);
543 void fault_in_user_windows(void)
545 struct thread_info
*t
= current_thread_info();
546 unsigned long window
;
548 flush_user_windows();
549 window
= get_thread_wsaved();
551 if (likely(window
!= 0)) {
554 struct reg_window
*rwin
= &t
->reg_window
[window
];
555 int winsize
= sizeof(struct reg_window
);
558 sp
= t
->rwbuf_stkptrs
[window
];
560 if (test_thread_64bit_stack(sp
))
563 winsize
= sizeof(struct reg_window32
);
565 if (unlikely(sp
& 0x7UL
))
568 if (unlikely(copy_to_user((char __user
*)sp
,
573 set_thread_wsaved(0);
577 set_thread_wsaved(window
+ 1);
582 asmlinkage
long sparc_do_fork(unsigned long clone_flags
,
583 unsigned long stack_start
,
584 struct pt_regs
*regs
,
585 unsigned long stack_size
)
587 int __user
*parent_tid_ptr
, *child_tid_ptr
;
588 unsigned long orig_i1
= regs
->u_regs
[UREG_I1
];
592 if (test_thread_flag(TIF_32BIT
)) {
593 parent_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I2
]);
594 child_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I4
]);
598 parent_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I2
];
599 child_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I4
];
602 ret
= do_fork(clone_flags
, stack_start
, stack_size
,
603 parent_tid_ptr
, child_tid_ptr
);
605 /* If we get an error and potentially restart the system
606 * call, we're screwed because copy_thread() clobbered
607 * the parent's %o1. So detect that case and restore it
610 if ((unsigned long)ret
>= -ERESTART_RESTARTBLOCK
)
611 regs
->u_regs
[UREG_I1
] = orig_i1
;
616 /* Copy a Sparc thread. The fork() return value conventions
617 * under SunOS are nothing short of bletcherous:
618 * Parent --> %o0 == childs pid, %o1 == 0
619 * Child --> %o0 == parents pid, %o1 == 1
621 int copy_thread(unsigned long clone_flags
, unsigned long sp
,
622 unsigned long arg
, struct task_struct
*p
)
624 struct thread_info
*t
= task_thread_info(p
);
625 struct pt_regs
*regs
= current_pt_regs();
626 struct sparc_stackf
*parent_sf
;
627 unsigned long child_stack_sz
;
628 char *child_trap_frame
;
630 /* Calculate offset to stack_frame & pt_regs */
631 child_stack_sz
= (STACKFRAME_SZ
+ TRACEREG_SZ
);
632 child_trap_frame
= (task_stack_page(p
) +
633 (THREAD_SIZE
- child_stack_sz
));
636 t
->ksp
= ((unsigned long) child_trap_frame
) - STACK_BIAS
;
637 t
->kregs
= (struct pt_regs
*) (child_trap_frame
+
638 sizeof(struct sparc_stackf
));
641 if (unlikely(p
->flags
& PF_KTHREAD
)) {
642 memset(child_trap_frame
, 0, child_stack_sz
);
643 __thread_flag_byte_ptr(t
)[TI_FLAG_BYTE_CWP
] =
644 (current_pt_regs()->tstate
+ 1) & TSTATE_CWP
;
645 t
->current_ds
= ASI_P
;
646 t
->kregs
->u_regs
[UREG_G1
] = sp
; /* function */
647 t
->kregs
->u_regs
[UREG_G2
] = arg
;
651 parent_sf
= ((struct sparc_stackf
*) regs
) - 1;
652 memcpy(child_trap_frame
, parent_sf
, child_stack_sz
);
653 if (t
->flags
& _TIF_32BIT
) {
654 sp
&= 0x00000000ffffffffUL
;
655 regs
->u_regs
[UREG_FP
] &= 0x00000000ffffffffUL
;
657 t
->kregs
->u_regs
[UREG_FP
] = sp
;
658 __thread_flag_byte_ptr(t
)[TI_FLAG_BYTE_CWP
] =
659 (regs
->tstate
+ 1) & TSTATE_CWP
;
660 t
->current_ds
= ASI_AIUS
;
661 if (sp
!= regs
->u_regs
[UREG_FP
]) {
664 csp
= clone_stackframe(sp
, regs
->u_regs
[UREG_FP
]);
667 t
->kregs
->u_regs
[UREG_FP
] = csp
;
672 /* Set the return value for the child. */
673 t
->kregs
->u_regs
[UREG_I0
] = current
->pid
;
674 t
->kregs
->u_regs
[UREG_I1
] = 1;
676 /* Set the second return value for the parent. */
677 regs
->u_regs
[UREG_I1
] = 0;
679 if (clone_flags
& CLONE_SETTLS
)
680 t
->kregs
->u_regs
[UREG_G7
] = regs
->u_regs
[UREG_I3
];
687 unsigned int pr_regs
[32];
688 unsigned long pr_dregs
[16];
690 unsigned int __unused
;
692 unsigned char pr_qcnt
;
693 unsigned char pr_q_entrysize
;
695 unsigned int pr_q
[64];
699 * fill in the fpu structure for a core dump.
701 int dump_fpu (struct pt_regs
* regs
, elf_fpregset_t
* fpregs
)
703 unsigned long *kfpregs
= current_thread_info()->fpregs
;
704 unsigned long fprs
= current_thread_info()->fpsaved
[0];
706 if (test_thread_flag(TIF_32BIT
)) {
707 elf_fpregset_t32
*fpregs32
= (elf_fpregset_t32
*)fpregs
;
710 memcpy(&fpregs32
->pr_fr
.pr_regs
[0], kfpregs
,
711 sizeof(unsigned int) * 32);
713 memset(&fpregs32
->pr_fr
.pr_regs
[0], 0,
714 sizeof(unsigned int) * 32);
715 fpregs32
->pr_qcnt
= 0;
716 fpregs32
->pr_q_entrysize
= 8;
717 memset(&fpregs32
->pr_q
[0], 0,
718 (sizeof(unsigned int) * 64));
719 if (fprs
& FPRS_FEF
) {
720 fpregs32
->pr_fsr
= (unsigned int) current_thread_info()->xfsr
[0];
723 fpregs32
->pr_fsr
= 0;
728 memcpy(&fpregs
->pr_regs
[0], kfpregs
,
729 sizeof(unsigned int) * 32);
731 memset(&fpregs
->pr_regs
[0], 0,
732 sizeof(unsigned int) * 32);
734 memcpy(&fpregs
->pr_regs
[16], kfpregs
+16,
735 sizeof(unsigned int) * 32);
737 memset(&fpregs
->pr_regs
[16], 0,
738 sizeof(unsigned int) * 32);
739 if(fprs
& FPRS_FEF
) {
740 fpregs
->pr_fsr
= current_thread_info()->xfsr
[0];
741 fpregs
->pr_gsr
= current_thread_info()->gsr
[0];
743 fpregs
->pr_fsr
= fpregs
->pr_gsr
= 0;
745 fpregs
->pr_fprs
= fprs
;
749 EXPORT_SYMBOL(dump_fpu
);
751 unsigned long get_wchan(struct task_struct
*task
)
753 unsigned long pc
, fp
, bias
= 0;
754 struct thread_info
*tp
;
755 struct reg_window
*rw
;
756 unsigned long ret
= 0;
759 if (!task
|| task
== current
||
760 task
->state
== TASK_RUNNING
)
763 tp
= task_thread_info(task
);
765 fp
= task_thread_info(task
)->ksp
+ bias
;
768 if (!kstack_valid(tp
, fp
))
770 rw
= (struct reg_window
*) fp
;
772 if (!in_sched_functions(pc
)) {
776 fp
= rw
->ins
[6] + bias
;
777 } while (++count
< 16);