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>
34 #include <linux/context_tracking.h>
36 #include <asm/uaccess.h>
38 #include <asm/pgalloc.h>
39 #include <asm/pgtable.h>
40 #include <asm/processor.h>
41 #include <asm/pstate.h>
43 #include <asm/fpumacro.h>
45 #include <asm/cpudata.h>
46 #include <asm/mmu_context.h>
47 #include <asm/unistd.h>
48 #include <asm/hypervisor.h>
49 #include <asm/syscalls.h>
50 #include <asm/irq_regs.h>
56 /* Idle loop support on sparc64. */
57 void arch_cpu_idle(void)
59 if (tlb_type
!= hypervisor
) {
67 /* The sun4v sleeping code requires that we have PSTATE.IE cleared over
68 * the cpu sleep hypervisor call.
71 "rdpr %%pstate, %0\n\t"
73 "wrpr %0, %%g0, %%pstate"
77 if (!need_resched() && !cpu_is_offline(smp_processor_id()))
80 /* Re-enable interrupts. */
82 "rdpr %%pstate, %0\n\t"
84 "wrpr %0, %%g0, %%pstate"
90 #ifdef CONFIG_HOTPLUG_CPU
91 void arch_cpu_idle_dead(void)
93 sched_preempt_enable_no_resched();
99 static void show_regwindow32(struct pt_regs
*regs
)
101 struct reg_window32 __user
*rw
;
102 struct reg_window32 r_w
;
105 __asm__
__volatile__ ("flushw");
106 rw
= compat_ptr((unsigned)regs
->u_regs
[14]);
109 if (copy_from_user (&r_w
, rw
, sizeof(r_w
))) {
115 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
116 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
117 r_w
.locals
[0], r_w
.locals
[1], r_w
.locals
[2], r_w
.locals
[3],
118 r_w
.locals
[4], r_w
.locals
[5], r_w
.locals
[6], r_w
.locals
[7]);
119 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
120 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
121 r_w
.ins
[0], r_w
.ins
[1], r_w
.ins
[2], r_w
.ins
[3],
122 r_w
.ins
[4], r_w
.ins
[5], r_w
.ins
[6], r_w
.ins
[7]);
125 #define show_regwindow32(regs) do { } while (0)
128 static void show_regwindow(struct pt_regs
*regs
)
130 struct reg_window __user
*rw
;
131 struct reg_window
*rwk
;
132 struct reg_window r_w
;
135 if ((regs
->tstate
& TSTATE_PRIV
) || !(test_thread_flag(TIF_32BIT
))) {
136 __asm__
__volatile__ ("flushw");
137 rw
= (struct reg_window __user
*)
138 (regs
->u_regs
[14] + STACK_BIAS
);
139 rwk
= (struct reg_window
*)
140 (regs
->u_regs
[14] + STACK_BIAS
);
141 if (!(regs
->tstate
& TSTATE_PRIV
)) {
144 if (copy_from_user (&r_w
, rw
, sizeof(r_w
))) {
152 show_regwindow32(regs
);
155 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
156 rwk
->locals
[0], rwk
->locals
[1], rwk
->locals
[2], rwk
->locals
[3]);
157 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
158 rwk
->locals
[4], rwk
->locals
[5], rwk
->locals
[6], rwk
->locals
[7]);
159 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
160 rwk
->ins
[0], rwk
->ins
[1], rwk
->ins
[2], rwk
->ins
[3]);
161 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
162 rwk
->ins
[4], rwk
->ins
[5], rwk
->ins
[6], rwk
->ins
[7]);
163 if (regs
->tstate
& TSTATE_PRIV
)
164 printk("I7: <%pS>\n", (void *) rwk
->ins
[7]);
167 void show_regs(struct pt_regs
*regs
)
169 show_regs_print_info(KERN_DEFAULT
);
171 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs
->tstate
,
172 regs
->tpc
, regs
->tnpc
, regs
->y
, print_tainted());
173 printk("TPC: <%pS>\n", (void *) regs
->tpc
);
174 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
175 regs
->u_regs
[0], regs
->u_regs
[1], regs
->u_regs
[2],
177 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
178 regs
->u_regs
[4], regs
->u_regs
[5], regs
->u_regs
[6],
180 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
181 regs
->u_regs
[8], regs
->u_regs
[9], regs
->u_regs
[10],
183 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
184 regs
->u_regs
[12], regs
->u_regs
[13], regs
->u_regs
[14],
186 printk("RPC: <%pS>\n", (void *) regs
->u_regs
[15]);
187 show_regwindow(regs
);
188 show_stack(current
, (unsigned long *) regs
->u_regs
[UREG_FP
]);
191 union global_cpu_snapshot global_cpu_snapshot
[NR_CPUS
];
192 static DEFINE_SPINLOCK(global_cpu_snapshot_lock
);
194 static void __global_reg_self(struct thread_info
*tp
, struct pt_regs
*regs
,
197 struct global_reg_snapshot
*rp
;
201 rp
= &global_cpu_snapshot
[this_cpu
].reg
;
203 rp
->tstate
= regs
->tstate
;
205 rp
->tnpc
= regs
->tnpc
;
206 rp
->o7
= regs
->u_regs
[UREG_I7
];
208 if (regs
->tstate
& TSTATE_PRIV
) {
209 struct reg_window
*rw
;
211 rw
= (struct reg_window
*)
212 (regs
->u_regs
[UREG_FP
] + STACK_BIAS
);
213 if (kstack_valid(tp
, (unsigned long) rw
)) {
215 rw
= (struct reg_window
*)
216 (rw
->ins
[6] + STACK_BIAS
);
217 if (kstack_valid(tp
, (unsigned long) rw
))
218 rp
->rpc
= rw
->ins
[7];
227 /* In order to avoid hangs we do not try to synchronize with the
228 * global register dump client cpus. The last store they make is to
229 * the thread pointer, so do a short poll waiting for that to become
232 static void __global_reg_poll(struct global_reg_snapshot
*gp
)
236 while (!gp
->thread
&& ++limit
< 100) {
242 void arch_trigger_all_cpu_backtrace(bool include_self
)
244 struct thread_info
*tp
= current_thread_info();
245 struct pt_regs
*regs
= get_irq_regs();
252 spin_lock_irqsave(&global_cpu_snapshot_lock
, flags
);
254 this_cpu
= raw_smp_processor_id();
256 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
259 __global_reg_self(tp
, regs
, this_cpu
);
261 smp_fetch_global_regs();
263 for_each_online_cpu(cpu
) {
264 struct global_reg_snapshot
*gp
;
266 if (!include_self
&& cpu
== this_cpu
)
269 gp
= &global_cpu_snapshot
[cpu
].reg
;
271 __global_reg_poll(gp
);
274 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
275 (cpu
== this_cpu
? '*' : ' '), cpu
,
276 gp
->tstate
, gp
->tpc
, gp
->tnpc
,
277 ((tp
&& tp
->task
) ? tp
->task
->comm
: "NULL"),
278 ((tp
&& tp
->task
) ? tp
->task
->pid
: -1));
280 if (gp
->tstate
& TSTATE_PRIV
) {
281 printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
287 printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
288 gp
->tpc
, gp
->o7
, gp
->i7
, gp
->rpc
);
292 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
294 spin_unlock_irqrestore(&global_cpu_snapshot_lock
, flags
);
297 #ifdef CONFIG_MAGIC_SYSRQ
299 static void sysrq_handle_globreg(int key
)
301 arch_trigger_all_cpu_backtrace(true);
304 static struct sysrq_key_op sparc_globalreg_op
= {
305 .handler
= sysrq_handle_globreg
,
306 .help_msg
= "global-regs(y)",
307 .action_msg
= "Show Global CPU Regs",
310 static void __global_pmu_self(int this_cpu
)
312 struct global_pmu_snapshot
*pp
;
318 pp
= &global_cpu_snapshot
[this_cpu
].pmu
;
321 if (tlb_type
== hypervisor
&&
322 sun4v_chip_type
>= SUN4V_CHIP_NIAGARA4
)
325 for (i
= 0; i
< num
; i
++) {
326 pp
->pcr
[i
] = pcr_ops
->read_pcr(i
);
327 pp
->pic
[i
] = pcr_ops
->read_pic(i
);
331 static void __global_pmu_poll(struct global_pmu_snapshot
*pp
)
335 while (!pp
->pcr
[0] && ++limit
< 100) {
341 static void pmu_snapshot_all_cpus(void)
346 spin_lock_irqsave(&global_cpu_snapshot_lock
, flags
);
348 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
350 this_cpu
= raw_smp_processor_id();
352 __global_pmu_self(this_cpu
);
354 smp_fetch_global_pmu();
356 for_each_online_cpu(cpu
) {
357 struct global_pmu_snapshot
*pp
= &global_cpu_snapshot
[cpu
].pmu
;
359 __global_pmu_poll(pp
);
361 printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n",
362 (cpu
== this_cpu
? '*' : ' '), cpu
,
363 pp
->pcr
[0], pp
->pcr
[1], pp
->pcr
[2], pp
->pcr
[3],
364 pp
->pic
[0], pp
->pic
[1], pp
->pic
[2], pp
->pic
[3]);
367 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
369 spin_unlock_irqrestore(&global_cpu_snapshot_lock
, flags
);
372 static void sysrq_handle_globpmu(int key
)
374 pmu_snapshot_all_cpus();
377 static struct sysrq_key_op sparc_globalpmu_op
= {
378 .handler
= sysrq_handle_globpmu
,
379 .help_msg
= "global-pmu(x)",
380 .action_msg
= "Show Global PMU Regs",
383 static int __init
sparc_sysrq_init(void)
385 int ret
= register_sysrq_key('y', &sparc_globalreg_op
);
388 ret
= register_sysrq_key('x', &sparc_globalpmu_op
);
392 core_initcall(sparc_sysrq_init
);
396 unsigned long thread_saved_pc(struct task_struct
*tsk
)
398 struct thread_info
*ti
= task_thread_info(tsk
);
399 unsigned long ret
= 0xdeadbeefUL
;
403 sp
= (unsigned long *)(ti
->ksp
+ STACK_BIAS
);
404 if (((unsigned long)sp
& (sizeof(long) - 1)) == 0UL &&
407 fp
= (unsigned long *)(sp
[14] + STACK_BIAS
);
408 if (((unsigned long)fp
& (sizeof(long) - 1)) == 0UL)
415 /* Free current thread data structures etc.. */
416 void exit_thread(void)
418 struct thread_info
*t
= current_thread_info();
421 if (t
->utraps
[0] < 2)
428 void flush_thread(void)
430 struct thread_info
*t
= current_thread_info();
431 struct mm_struct
*mm
;
435 tsb_context_switch(mm
);
437 set_thread_wsaved(0);
439 /* Clear FPU register state. */
443 /* It's a bit more tricky when 64-bit tasks are involved... */
444 static unsigned long clone_stackframe(unsigned long csp
, unsigned long psp
)
446 bool stack_64bit
= test_thread_64bit_stack(psp
);
447 unsigned long fp
, distance
, rval
;
452 __get_user(fp
, &(((struct reg_window __user
*)psp
)->ins
[6]));
454 if (test_thread_flag(TIF_32BIT
))
457 __get_user(fp
, &(((struct reg_window32 __user
*)psp
)->ins
[6]));
459 /* Now align the stack as this is mandatory in the Sparc ABI
460 * due to how register windows work. This hides the
461 * restriction from thread libraries etc.
466 rval
= (csp
- distance
);
467 if (copy_in_user((void __user
*) rval
, (void __user
*) psp
, distance
))
469 else if (!stack_64bit
) {
470 if (put_user(((u32
)csp
),
471 &(((struct reg_window32 __user
*)rval
)->ins
[6])))
474 if (put_user(((u64
)csp
- STACK_BIAS
),
475 &(((struct reg_window __user
*)rval
)->ins
[6])))
478 rval
= rval
- STACK_BIAS
;
484 /* Standard stuff. */
485 static inline void shift_window_buffer(int first_win
, int last_win
,
486 struct thread_info
*t
)
490 for (i
= first_win
; i
< last_win
; i
++) {
491 t
->rwbuf_stkptrs
[i
] = t
->rwbuf_stkptrs
[i
+1];
492 memcpy(&t
->reg_window
[i
], &t
->reg_window
[i
+1],
493 sizeof(struct reg_window
));
497 void synchronize_user_stack(void)
499 struct thread_info
*t
= current_thread_info();
500 unsigned long window
;
502 flush_user_windows();
503 if ((window
= get_thread_wsaved()) != 0) {
506 struct reg_window
*rwin
= &t
->reg_window
[window
];
507 int winsize
= sizeof(struct reg_window
);
510 sp
= t
->rwbuf_stkptrs
[window
];
512 if (test_thread_64bit_stack(sp
))
515 winsize
= sizeof(struct reg_window32
);
517 if (!copy_to_user((char __user
*)sp
, rwin
, winsize
)) {
518 shift_window_buffer(window
, get_thread_wsaved() - 1, t
);
519 set_thread_wsaved(get_thread_wsaved() - 1);
525 static void stack_unaligned(unsigned long sp
)
529 info
.si_signo
= SIGBUS
;
531 info
.si_code
= BUS_ADRALN
;
532 info
.si_addr
= (void __user
*) sp
;
534 force_sig_info(SIGBUS
, &info
, current
);
537 void fault_in_user_windows(void)
539 struct thread_info
*t
= current_thread_info();
540 unsigned long window
;
542 flush_user_windows();
543 window
= get_thread_wsaved();
545 if (likely(window
!= 0)) {
548 struct reg_window
*rwin
= &t
->reg_window
[window
];
549 int winsize
= sizeof(struct reg_window
);
552 sp
= t
->rwbuf_stkptrs
[window
];
554 if (test_thread_64bit_stack(sp
))
557 winsize
= sizeof(struct reg_window32
);
559 if (unlikely(sp
& 0x7UL
))
562 if (unlikely(copy_to_user((char __user
*)sp
,
567 set_thread_wsaved(0);
571 set_thread_wsaved(window
+ 1);
576 asmlinkage
long sparc_do_fork(unsigned long clone_flags
,
577 unsigned long stack_start
,
578 struct pt_regs
*regs
,
579 unsigned long stack_size
)
581 int __user
*parent_tid_ptr
, *child_tid_ptr
;
582 unsigned long orig_i1
= regs
->u_regs
[UREG_I1
];
586 if (test_thread_flag(TIF_32BIT
)) {
587 parent_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I2
]);
588 child_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I4
]);
592 parent_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I2
];
593 child_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I4
];
596 ret
= do_fork(clone_flags
, stack_start
, stack_size
,
597 parent_tid_ptr
, child_tid_ptr
);
599 /* If we get an error and potentially restart the system
600 * call, we're screwed because copy_thread() clobbered
601 * the parent's %o1. So detect that case and restore it
604 if ((unsigned long)ret
>= -ERESTART_RESTARTBLOCK
)
605 regs
->u_regs
[UREG_I1
] = orig_i1
;
610 /* Copy a Sparc thread. The fork() return value conventions
611 * under SunOS are nothing short of bletcherous:
612 * Parent --> %o0 == childs pid, %o1 == 0
613 * Child --> %o0 == parents pid, %o1 == 1
615 int copy_thread(unsigned long clone_flags
, unsigned long sp
,
616 unsigned long arg
, struct task_struct
*p
)
618 struct thread_info
*t
= task_thread_info(p
);
619 struct pt_regs
*regs
= current_pt_regs();
620 struct sparc_stackf
*parent_sf
;
621 unsigned long child_stack_sz
;
622 char *child_trap_frame
;
624 /* Calculate offset to stack_frame & pt_regs */
625 child_stack_sz
= (STACKFRAME_SZ
+ TRACEREG_SZ
);
626 child_trap_frame
= (task_stack_page(p
) +
627 (THREAD_SIZE
- child_stack_sz
));
630 t
->ksp
= ((unsigned long) child_trap_frame
) - STACK_BIAS
;
631 t
->kregs
= (struct pt_regs
*) (child_trap_frame
+
632 sizeof(struct sparc_stackf
));
635 if (unlikely(p
->flags
& PF_KTHREAD
)) {
636 memset(child_trap_frame
, 0, child_stack_sz
);
637 __thread_flag_byte_ptr(t
)[TI_FLAG_BYTE_CWP
] =
638 (current_pt_regs()->tstate
+ 1) & TSTATE_CWP
;
639 t
->current_ds
= ASI_P
;
640 t
->kregs
->u_regs
[UREG_G1
] = sp
; /* function */
641 t
->kregs
->u_regs
[UREG_G2
] = arg
;
645 parent_sf
= ((struct sparc_stackf
*) regs
) - 1;
646 memcpy(child_trap_frame
, parent_sf
, child_stack_sz
);
647 if (t
->flags
& _TIF_32BIT
) {
648 sp
&= 0x00000000ffffffffUL
;
649 regs
->u_regs
[UREG_FP
] &= 0x00000000ffffffffUL
;
651 t
->kregs
->u_regs
[UREG_FP
] = sp
;
652 __thread_flag_byte_ptr(t
)[TI_FLAG_BYTE_CWP
] =
653 (regs
->tstate
+ 1) & TSTATE_CWP
;
654 t
->current_ds
= ASI_AIUS
;
655 if (sp
!= regs
->u_regs
[UREG_FP
]) {
658 csp
= clone_stackframe(sp
, regs
->u_regs
[UREG_FP
]);
661 t
->kregs
->u_regs
[UREG_FP
] = csp
;
666 /* Set the return value for the child. */
667 t
->kregs
->u_regs
[UREG_I0
] = current
->pid
;
668 t
->kregs
->u_regs
[UREG_I1
] = 1;
670 /* Set the second return value for the parent. */
671 regs
->u_regs
[UREG_I1
] = 0;
673 if (clone_flags
& CLONE_SETTLS
)
674 t
->kregs
->u_regs
[UREG_G7
] = regs
->u_regs
[UREG_I3
];
681 unsigned int pr_regs
[32];
682 unsigned long pr_dregs
[16];
684 unsigned int __unused
;
686 unsigned char pr_qcnt
;
687 unsigned char pr_q_entrysize
;
689 unsigned int pr_q
[64];
693 * fill in the fpu structure for a core dump.
695 int dump_fpu (struct pt_regs
* regs
, elf_fpregset_t
* fpregs
)
697 unsigned long *kfpregs
= current_thread_info()->fpregs
;
698 unsigned long fprs
= current_thread_info()->fpsaved
[0];
700 if (test_thread_flag(TIF_32BIT
)) {
701 elf_fpregset_t32
*fpregs32
= (elf_fpregset_t32
*)fpregs
;
704 memcpy(&fpregs32
->pr_fr
.pr_regs
[0], kfpregs
,
705 sizeof(unsigned int) * 32);
707 memset(&fpregs32
->pr_fr
.pr_regs
[0], 0,
708 sizeof(unsigned int) * 32);
709 fpregs32
->pr_qcnt
= 0;
710 fpregs32
->pr_q_entrysize
= 8;
711 memset(&fpregs32
->pr_q
[0], 0,
712 (sizeof(unsigned int) * 64));
713 if (fprs
& FPRS_FEF
) {
714 fpregs32
->pr_fsr
= (unsigned int) current_thread_info()->xfsr
[0];
717 fpregs32
->pr_fsr
= 0;
722 memcpy(&fpregs
->pr_regs
[0], kfpregs
,
723 sizeof(unsigned int) * 32);
725 memset(&fpregs
->pr_regs
[0], 0,
726 sizeof(unsigned int) * 32);
728 memcpy(&fpregs
->pr_regs
[16], kfpregs
+16,
729 sizeof(unsigned int) * 32);
731 memset(&fpregs
->pr_regs
[16], 0,
732 sizeof(unsigned int) * 32);
733 if(fprs
& FPRS_FEF
) {
734 fpregs
->pr_fsr
= current_thread_info()->xfsr
[0];
735 fpregs
->pr_gsr
= current_thread_info()->gsr
[0];
737 fpregs
->pr_fsr
= fpregs
->pr_gsr
= 0;
739 fpregs
->pr_fprs
= fprs
;
743 EXPORT_SYMBOL(dump_fpu
);
745 unsigned long get_wchan(struct task_struct
*task
)
747 unsigned long pc
, fp
, bias
= 0;
748 struct thread_info
*tp
;
749 struct reg_window
*rw
;
750 unsigned long ret
= 0;
753 if (!task
|| task
== current
||
754 task
->state
== TASK_RUNNING
)
757 tp
= task_thread_info(task
);
759 fp
= task_thread_info(task
)->ksp
+ bias
;
762 if (!kstack_valid(tp
, fp
))
764 rw
= (struct reg_window
*) fp
;
766 if (!in_sched_functions(pc
)) {
770 fp
= rw
->ins
[6] + bias
;
771 } while (++count
< 16);