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/kernel.h>
20 #include <linux/smp.h>
21 #include <linux/stddef.h>
22 #include <linux/ptrace.h>
23 #include <linux/slab.h>
24 #include <linux/user.h>
25 #include <linux/delay.h>
26 #include <linux/compat.h>
27 #include <linux/tick.h>
28 #include <linux/init.h>
29 #include <linux/cpu.h>
30 #include <linux/perf_event.h>
31 #include <linux/elfcore.h>
32 #include <linux/sysrq.h>
33 #include <linux/nmi.h>
35 #include <asm/uaccess.h>
37 #include <asm/pgalloc.h>
38 #include <asm/pgtable.h>
39 #include <asm/processor.h>
40 #include <asm/pstate.h>
42 #include <asm/fpumacro.h>
44 #include <asm/cpudata.h>
45 #include <asm/mmu_context.h>
46 #include <asm/unistd.h>
47 #include <asm/hypervisor.h>
48 #include <asm/syscalls.h>
49 #include <asm/irq_regs.h>
55 static void sparc64_yield(int cpu
)
57 if (tlb_type
!= hypervisor
) {
62 clear_thread_flag(TIF_POLLING_NRFLAG
);
63 smp_mb__after_clear_bit();
65 while (!need_resched() && !cpu_is_offline(cpu
)) {
68 /* Disable interrupts. */
70 "rdpr %%pstate, %0\n\t"
72 "wrpr %0, %%g0, %%pstate"
76 if (!need_resched() && !cpu_is_offline(cpu
))
79 /* Re-enable interrupts. */
81 "rdpr %%pstate, %0\n\t"
83 "wrpr %0, %%g0, %%pstate"
88 set_thread_flag(TIF_POLLING_NRFLAG
);
91 /* The idle loop on sparc64. */
94 int cpu
= smp_processor_id();
96 set_thread_flag(TIF_POLLING_NRFLAG
);
99 tick_nohz_idle_enter();
102 while (!need_resched() && !cpu_is_offline(cpu
))
106 tick_nohz_idle_exit();
108 #ifdef CONFIG_HOTPLUG_CPU
109 if (cpu_is_offline(cpu
)) {
110 sched_preempt_enable_no_resched();
114 schedule_preempt_disabled();
119 static void show_regwindow32(struct pt_regs
*regs
)
121 struct reg_window32 __user
*rw
;
122 struct reg_window32 r_w
;
125 __asm__
__volatile__ ("flushw");
126 rw
= compat_ptr((unsigned)regs
->u_regs
[14]);
129 if (copy_from_user (&r_w
, rw
, sizeof(r_w
))) {
135 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
136 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
137 r_w
.locals
[0], r_w
.locals
[1], r_w
.locals
[2], r_w
.locals
[3],
138 r_w
.locals
[4], r_w
.locals
[5], r_w
.locals
[6], r_w
.locals
[7]);
139 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
140 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
141 r_w
.ins
[0], r_w
.ins
[1], r_w
.ins
[2], r_w
.ins
[3],
142 r_w
.ins
[4], r_w
.ins
[5], r_w
.ins
[6], r_w
.ins
[7]);
145 #define show_regwindow32(regs) do { } while (0)
148 static void show_regwindow(struct pt_regs
*regs
)
150 struct reg_window __user
*rw
;
151 struct reg_window
*rwk
;
152 struct reg_window r_w
;
155 if ((regs
->tstate
& TSTATE_PRIV
) || !(test_thread_flag(TIF_32BIT
))) {
156 __asm__
__volatile__ ("flushw");
157 rw
= (struct reg_window __user
*)
158 (regs
->u_regs
[14] + STACK_BIAS
);
159 rwk
= (struct reg_window
*)
160 (regs
->u_regs
[14] + STACK_BIAS
);
161 if (!(regs
->tstate
& TSTATE_PRIV
)) {
164 if (copy_from_user (&r_w
, rw
, sizeof(r_w
))) {
172 show_regwindow32(regs
);
175 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
176 rwk
->locals
[0], rwk
->locals
[1], rwk
->locals
[2], rwk
->locals
[3]);
177 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
178 rwk
->locals
[4], rwk
->locals
[5], rwk
->locals
[6], rwk
->locals
[7]);
179 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
180 rwk
->ins
[0], rwk
->ins
[1], rwk
->ins
[2], rwk
->ins
[3]);
181 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
182 rwk
->ins
[4], rwk
->ins
[5], rwk
->ins
[6], rwk
->ins
[7]);
183 if (regs
->tstate
& TSTATE_PRIV
)
184 printk("I7: <%pS>\n", (void *) rwk
->ins
[7]);
187 void show_regs(struct pt_regs
*regs
)
189 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs
->tstate
,
190 regs
->tpc
, regs
->tnpc
, regs
->y
, print_tainted());
191 printk("TPC: <%pS>\n", (void *) regs
->tpc
);
192 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
193 regs
->u_regs
[0], regs
->u_regs
[1], regs
->u_regs
[2],
195 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
196 regs
->u_regs
[4], regs
->u_regs
[5], regs
->u_regs
[6],
198 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
199 regs
->u_regs
[8], regs
->u_regs
[9], regs
->u_regs
[10],
201 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
202 regs
->u_regs
[12], regs
->u_regs
[13], regs
->u_regs
[14],
204 printk("RPC: <%pS>\n", (void *) regs
->u_regs
[15]);
205 show_regwindow(regs
);
206 show_stack(current
, (unsigned long *) regs
->u_regs
[UREG_FP
]);
209 union global_cpu_snapshot global_cpu_snapshot
[NR_CPUS
];
210 static DEFINE_SPINLOCK(global_cpu_snapshot_lock
);
212 static void __global_reg_self(struct thread_info
*tp
, struct pt_regs
*regs
,
215 struct global_reg_snapshot
*rp
;
219 rp
= &global_cpu_snapshot
[this_cpu
].reg
;
221 rp
->tstate
= regs
->tstate
;
223 rp
->tnpc
= regs
->tnpc
;
224 rp
->o7
= regs
->u_regs
[UREG_I7
];
226 if (regs
->tstate
& TSTATE_PRIV
) {
227 struct reg_window
*rw
;
229 rw
= (struct reg_window
*)
230 (regs
->u_regs
[UREG_FP
] + STACK_BIAS
);
231 if (kstack_valid(tp
, (unsigned long) rw
)) {
233 rw
= (struct reg_window
*)
234 (rw
->ins
[6] + STACK_BIAS
);
235 if (kstack_valid(tp
, (unsigned long) rw
))
236 rp
->rpc
= rw
->ins
[7];
245 /* In order to avoid hangs we do not try to synchronize with the
246 * global register dump client cpus. The last store they make is to
247 * the thread pointer, so do a short poll waiting for that to become
250 static void __global_reg_poll(struct global_reg_snapshot
*gp
)
254 while (!gp
->thread
&& ++limit
< 100) {
260 void arch_trigger_all_cpu_backtrace(void)
262 struct thread_info
*tp
= current_thread_info();
263 struct pt_regs
*regs
= get_irq_regs();
270 spin_lock_irqsave(&global_cpu_snapshot_lock
, flags
);
272 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
274 this_cpu
= raw_smp_processor_id();
276 __global_reg_self(tp
, regs
, this_cpu
);
278 smp_fetch_global_regs();
280 for_each_online_cpu(cpu
) {
281 struct global_reg_snapshot
*gp
= &global_cpu_snapshot
[cpu
].reg
;
283 __global_reg_poll(gp
);
286 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
287 (cpu
== this_cpu
? '*' : ' '), cpu
,
288 gp
->tstate
, gp
->tpc
, gp
->tnpc
,
289 ((tp
&& tp
->task
) ? tp
->task
->comm
: "NULL"),
290 ((tp
&& tp
->task
) ? tp
->task
->pid
: -1));
292 if (gp
->tstate
& TSTATE_PRIV
) {
293 printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
299 printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
300 gp
->tpc
, gp
->o7
, gp
->i7
, gp
->rpc
);
304 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
306 spin_unlock_irqrestore(&global_cpu_snapshot_lock
, flags
);
309 #ifdef CONFIG_MAGIC_SYSRQ
311 static void sysrq_handle_globreg(int key
)
313 arch_trigger_all_cpu_backtrace();
316 static struct sysrq_key_op sparc_globalreg_op
= {
317 .handler
= sysrq_handle_globreg
,
318 .help_msg
= "global-regs(Y)",
319 .action_msg
= "Show Global CPU Regs",
322 static void __global_pmu_self(int this_cpu
)
324 struct global_pmu_snapshot
*pp
;
327 pp
= &global_cpu_snapshot
[this_cpu
].pmu
;
330 if (tlb_type
== hypervisor
&&
331 sun4v_chip_type
>= SUN4V_CHIP_NIAGARA4
)
334 for (i
= 0; i
< num
; i
++) {
335 pp
->pcr
[i
] = pcr_ops
->read_pcr(i
);
336 pp
->pic
[i
] = pcr_ops
->read_pic(i
);
340 static void __global_pmu_poll(struct global_pmu_snapshot
*pp
)
344 while (!pp
->pcr
[0] && ++limit
< 100) {
350 static void pmu_snapshot_all_cpus(void)
355 spin_lock_irqsave(&global_cpu_snapshot_lock
, flags
);
357 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
359 this_cpu
= raw_smp_processor_id();
361 __global_pmu_self(this_cpu
);
363 smp_fetch_global_pmu();
365 for_each_online_cpu(cpu
) {
366 struct global_pmu_snapshot
*pp
= &global_cpu_snapshot
[cpu
].pmu
;
368 __global_pmu_poll(pp
);
370 printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n",
371 (cpu
== this_cpu
? '*' : ' '), cpu
,
372 pp
->pcr
[0], pp
->pcr
[1], pp
->pcr
[2], pp
->pcr
[3],
373 pp
->pic
[0], pp
->pic
[1], pp
->pic
[2], pp
->pic
[3]);
376 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
378 spin_unlock_irqrestore(&global_cpu_snapshot_lock
, flags
);
381 static void sysrq_handle_globpmu(int key
)
383 pmu_snapshot_all_cpus();
386 static struct sysrq_key_op sparc_globalpmu_op
= {
387 .handler
= sysrq_handle_globpmu
,
388 .help_msg
= "global-pmu(X)",
389 .action_msg
= "Show Global PMU Regs",
392 static int __init
sparc_sysrq_init(void)
394 int ret
= register_sysrq_key('y', &sparc_globalreg_op
);
397 ret
= register_sysrq_key('x', &sparc_globalpmu_op
);
401 core_initcall(sparc_sysrq_init
);
405 unsigned long thread_saved_pc(struct task_struct
*tsk
)
407 struct thread_info
*ti
= task_thread_info(tsk
);
408 unsigned long ret
= 0xdeadbeefUL
;
412 sp
= (unsigned long *)(ti
->ksp
+ STACK_BIAS
);
413 if (((unsigned long)sp
& (sizeof(long) - 1)) == 0UL &&
416 fp
= (unsigned long *)(sp
[14] + STACK_BIAS
);
417 if (((unsigned long)fp
& (sizeof(long) - 1)) == 0UL)
424 /* Free current thread data structures etc.. */
425 void exit_thread(void)
427 struct thread_info
*t
= current_thread_info();
430 if (t
->utraps
[0] < 2)
437 void flush_thread(void)
439 struct thread_info
*t
= current_thread_info();
440 struct mm_struct
*mm
;
444 tsb_context_switch(mm
);
446 set_thread_wsaved(0);
448 /* Clear FPU register state. */
452 /* It's a bit more tricky when 64-bit tasks are involved... */
453 static unsigned long clone_stackframe(unsigned long csp
, unsigned long psp
)
455 bool stack_64bit
= test_thread_64bit_stack(psp
);
456 unsigned long fp
, distance
, rval
;
461 __get_user(fp
, &(((struct reg_window __user
*)psp
)->ins
[6]));
463 if (test_thread_flag(TIF_32BIT
))
466 __get_user(fp
, &(((struct reg_window32 __user
*)psp
)->ins
[6]));
468 /* Now align the stack as this is mandatory in the Sparc ABI
469 * due to how register windows work. This hides the
470 * restriction from thread libraries etc.
475 rval
= (csp
- distance
);
476 if (copy_in_user((void __user
*) rval
, (void __user
*) psp
, distance
))
478 else if (!stack_64bit
) {
479 if (put_user(((u32
)csp
),
480 &(((struct reg_window32 __user
*)rval
)->ins
[6])))
483 if (put_user(((u64
)csp
- STACK_BIAS
),
484 &(((struct reg_window __user
*)rval
)->ins
[6])))
487 rval
= rval
- STACK_BIAS
;
493 /* Standard stuff. */
494 static inline void shift_window_buffer(int first_win
, int last_win
,
495 struct thread_info
*t
)
499 for (i
= first_win
; i
< last_win
; i
++) {
500 t
->rwbuf_stkptrs
[i
] = t
->rwbuf_stkptrs
[i
+1];
501 memcpy(&t
->reg_window
[i
], &t
->reg_window
[i
+1],
502 sizeof(struct reg_window
));
506 void synchronize_user_stack(void)
508 struct thread_info
*t
= current_thread_info();
509 unsigned long window
;
511 flush_user_windows();
512 if ((window
= get_thread_wsaved()) != 0) {
515 struct reg_window
*rwin
= &t
->reg_window
[window
];
516 int winsize
= sizeof(struct reg_window
);
519 sp
= t
->rwbuf_stkptrs
[window
];
521 if (test_thread_64bit_stack(sp
))
524 winsize
= sizeof(struct reg_window32
);
526 if (!copy_to_user((char __user
*)sp
, rwin
, winsize
)) {
527 shift_window_buffer(window
, get_thread_wsaved() - 1, t
);
528 set_thread_wsaved(get_thread_wsaved() - 1);
534 static void stack_unaligned(unsigned long sp
)
538 info
.si_signo
= SIGBUS
;
540 info
.si_code
= BUS_ADRALN
;
541 info
.si_addr
= (void __user
*) sp
;
543 force_sig_info(SIGBUS
, &info
, current
);
546 void fault_in_user_windows(void)
548 struct thread_info
*t
= current_thread_info();
549 unsigned long window
;
551 flush_user_windows();
552 window
= get_thread_wsaved();
554 if (likely(window
!= 0)) {
557 struct reg_window
*rwin
= &t
->reg_window
[window
];
558 int winsize
= sizeof(struct reg_window
);
561 sp
= t
->rwbuf_stkptrs
[window
];
563 if (test_thread_64bit_stack(sp
))
566 winsize
= sizeof(struct reg_window32
);
568 if (unlikely(sp
& 0x7UL
))
571 if (unlikely(copy_to_user((char __user
*)sp
,
576 set_thread_wsaved(0);
580 set_thread_wsaved(window
+ 1);
584 asmlinkage
long sparc_do_fork(unsigned long clone_flags
,
585 unsigned long stack_start
,
586 struct pt_regs
*regs
,
587 unsigned long stack_size
)
589 int __user
*parent_tid_ptr
, *child_tid_ptr
;
590 unsigned long orig_i1
= regs
->u_regs
[UREG_I1
];
594 if (test_thread_flag(TIF_32BIT
)) {
595 parent_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I2
]);
596 child_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I4
]);
600 parent_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I2
];
601 child_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I4
];
604 ret
= do_fork(clone_flags
, stack_start
, stack_size
,
605 parent_tid_ptr
, child_tid_ptr
);
607 /* If we get an error and potentially restart the system
608 * call, we're screwed because copy_thread() clobbered
609 * the parent's %o1. So detect that case and restore it
612 if ((unsigned long)ret
>= -ERESTART_RESTARTBLOCK
)
613 regs
->u_regs
[UREG_I1
] = orig_i1
;
618 /* Copy a Sparc thread. The fork() return value conventions
619 * under SunOS are nothing short of bletcherous:
620 * Parent --> %o0 == childs pid, %o1 == 0
621 * Child --> %o0 == parents pid, %o1 == 1
623 int copy_thread(unsigned long clone_flags
, unsigned long sp
,
624 unsigned long arg
, struct task_struct
*p
)
626 struct thread_info
*t
= task_thread_info(p
);
627 struct pt_regs
*regs
= current_pt_regs();
628 struct sparc_stackf
*parent_sf
;
629 unsigned long child_stack_sz
;
630 char *child_trap_frame
;
632 /* Calculate offset to stack_frame & pt_regs */
633 child_stack_sz
= (STACKFRAME_SZ
+ TRACEREG_SZ
);
634 child_trap_frame
= (task_stack_page(p
) +
635 (THREAD_SIZE
- child_stack_sz
));
638 t
->ksp
= ((unsigned long) child_trap_frame
) - STACK_BIAS
;
639 t
->kregs
= (struct pt_regs
*) (child_trap_frame
+
640 sizeof(struct sparc_stackf
));
643 if (unlikely(p
->flags
& PF_KTHREAD
)) {
644 memset(child_trap_frame
, 0, child_stack_sz
);
645 __thread_flag_byte_ptr(t
)[TI_FLAG_BYTE_CWP
] =
646 (current_pt_regs()->tstate
+ 1) & TSTATE_CWP
;
647 t
->current_ds
= ASI_P
;
648 t
->kregs
->u_regs
[UREG_G1
] = sp
; /* function */
649 t
->kregs
->u_regs
[UREG_G2
] = arg
;
653 parent_sf
= ((struct sparc_stackf
*) regs
) - 1;
654 memcpy(child_trap_frame
, parent_sf
, child_stack_sz
);
655 if (t
->flags
& _TIF_32BIT
) {
656 sp
&= 0x00000000ffffffffUL
;
657 regs
->u_regs
[UREG_FP
] &= 0x00000000ffffffffUL
;
659 t
->kregs
->u_regs
[UREG_FP
] = sp
;
660 __thread_flag_byte_ptr(t
)[TI_FLAG_BYTE_CWP
] =
661 (regs
->tstate
+ 1) & TSTATE_CWP
;
662 t
->current_ds
= ASI_AIUS
;
663 if (sp
!= regs
->u_regs
[UREG_FP
]) {
666 csp
= clone_stackframe(sp
, regs
->u_regs
[UREG_FP
]);
669 t
->kregs
->u_regs
[UREG_FP
] = csp
;
674 /* Set the return value for the child. */
675 t
->kregs
->u_regs
[UREG_I0
] = current
->pid
;
676 t
->kregs
->u_regs
[UREG_I1
] = 1;
678 /* Set the second return value for the parent. */
679 regs
->u_regs
[UREG_I1
] = 0;
681 if (clone_flags
& CLONE_SETTLS
)
682 t
->kregs
->u_regs
[UREG_G7
] = regs
->u_regs
[UREG_I3
];
689 unsigned int pr_regs
[32];
690 unsigned long pr_dregs
[16];
692 unsigned int __unused
;
694 unsigned char pr_qcnt
;
695 unsigned char pr_q_entrysize
;
697 unsigned int pr_q
[64];
701 * fill in the fpu structure for a core dump.
703 int dump_fpu (struct pt_regs
* regs
, elf_fpregset_t
* fpregs
)
705 unsigned long *kfpregs
= current_thread_info()->fpregs
;
706 unsigned long fprs
= current_thread_info()->fpsaved
[0];
708 if (test_thread_flag(TIF_32BIT
)) {
709 elf_fpregset_t32
*fpregs32
= (elf_fpregset_t32
*)fpregs
;
712 memcpy(&fpregs32
->pr_fr
.pr_regs
[0], kfpregs
,
713 sizeof(unsigned int) * 32);
715 memset(&fpregs32
->pr_fr
.pr_regs
[0], 0,
716 sizeof(unsigned int) * 32);
717 fpregs32
->pr_qcnt
= 0;
718 fpregs32
->pr_q_entrysize
= 8;
719 memset(&fpregs32
->pr_q
[0], 0,
720 (sizeof(unsigned int) * 64));
721 if (fprs
& FPRS_FEF
) {
722 fpregs32
->pr_fsr
= (unsigned int) current_thread_info()->xfsr
[0];
725 fpregs32
->pr_fsr
= 0;
730 memcpy(&fpregs
->pr_regs
[0], kfpregs
,
731 sizeof(unsigned int) * 32);
733 memset(&fpregs
->pr_regs
[0], 0,
734 sizeof(unsigned int) * 32);
736 memcpy(&fpregs
->pr_regs
[16], kfpregs
+16,
737 sizeof(unsigned int) * 32);
739 memset(&fpregs
->pr_regs
[16], 0,
740 sizeof(unsigned int) * 32);
741 if(fprs
& FPRS_FEF
) {
742 fpregs
->pr_fsr
= current_thread_info()->xfsr
[0];
743 fpregs
->pr_gsr
= current_thread_info()->gsr
[0];
745 fpregs
->pr_fsr
= fpregs
->pr_gsr
= 0;
747 fpregs
->pr_fprs
= fprs
;
751 EXPORT_SYMBOL(dump_fpu
);
753 unsigned long get_wchan(struct task_struct
*task
)
755 unsigned long pc
, fp
, bias
= 0;
756 struct thread_info
*tp
;
757 struct reg_window
*rw
;
758 unsigned long ret
= 0;
761 if (!task
|| task
== current
||
762 task
->state
== TASK_RUNNING
)
765 tp
= task_thread_info(task
);
767 fp
= task_thread_info(task
)->ksp
+ bias
;
770 if (!kstack_valid(tp
, fp
))
772 rw
= (struct reg_window
*) fp
;
774 if (!in_sched_functions(pc
)) {
778 fp
= rw
->ins
[6] + bias
;
779 } while (++count
< 16);