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 /* Idle loop support on sparc64. */
56 void arch_cpu_idle(void)
58 if (tlb_type
!= hypervisor
) {
63 /* The sun4v sleeping code requires that we have PSTATE.IE cleared over
64 * the cpu sleep hypervisor call.
67 "rdpr %%pstate, %0\n\t"
69 "wrpr %0, %%g0, %%pstate"
73 if (!need_resched() && !cpu_is_offline(smp_processor_id()))
76 /* Re-enable interrupts. */
78 "rdpr %%pstate, %0\n\t"
80 "wrpr %0, %%g0, %%pstate"
87 #ifdef CONFIG_HOTPLUG_CPU
88 void arch_cpu_idle_dead()
90 sched_preempt_enable_no_resched();
96 static void show_regwindow32(struct pt_regs
*regs
)
98 struct reg_window32 __user
*rw
;
99 struct reg_window32 r_w
;
102 __asm__
__volatile__ ("flushw");
103 rw
= compat_ptr((unsigned)regs
->u_regs
[14]);
106 if (copy_from_user (&r_w
, rw
, sizeof(r_w
))) {
112 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
113 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
114 r_w
.locals
[0], r_w
.locals
[1], r_w
.locals
[2], r_w
.locals
[3],
115 r_w
.locals
[4], r_w
.locals
[5], r_w
.locals
[6], r_w
.locals
[7]);
116 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
117 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
118 r_w
.ins
[0], r_w
.ins
[1], r_w
.ins
[2], r_w
.ins
[3],
119 r_w
.ins
[4], r_w
.ins
[5], r_w
.ins
[6], r_w
.ins
[7]);
122 #define show_regwindow32(regs) do { } while (0)
125 static void show_regwindow(struct pt_regs
*regs
)
127 struct reg_window __user
*rw
;
128 struct reg_window
*rwk
;
129 struct reg_window r_w
;
132 if ((regs
->tstate
& TSTATE_PRIV
) || !(test_thread_flag(TIF_32BIT
))) {
133 __asm__
__volatile__ ("flushw");
134 rw
= (struct reg_window __user
*)
135 (regs
->u_regs
[14] + STACK_BIAS
);
136 rwk
= (struct reg_window
*)
137 (regs
->u_regs
[14] + STACK_BIAS
);
138 if (!(regs
->tstate
& TSTATE_PRIV
)) {
141 if (copy_from_user (&r_w
, rw
, sizeof(r_w
))) {
149 show_regwindow32(regs
);
152 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
153 rwk
->locals
[0], rwk
->locals
[1], rwk
->locals
[2], rwk
->locals
[3]);
154 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
155 rwk
->locals
[4], rwk
->locals
[5], rwk
->locals
[6], rwk
->locals
[7]);
156 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
157 rwk
->ins
[0], rwk
->ins
[1], rwk
->ins
[2], rwk
->ins
[3]);
158 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
159 rwk
->ins
[4], rwk
->ins
[5], rwk
->ins
[6], rwk
->ins
[7]);
160 if (regs
->tstate
& TSTATE_PRIV
)
161 printk("I7: <%pS>\n", (void *) rwk
->ins
[7]);
164 void show_regs(struct pt_regs
*regs
)
166 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs
->tstate
,
167 regs
->tpc
, regs
->tnpc
, regs
->y
, print_tainted());
168 printk("TPC: <%pS>\n", (void *) regs
->tpc
);
169 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
170 regs
->u_regs
[0], regs
->u_regs
[1], regs
->u_regs
[2],
172 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
173 regs
->u_regs
[4], regs
->u_regs
[5], regs
->u_regs
[6],
175 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
176 regs
->u_regs
[8], regs
->u_regs
[9], regs
->u_regs
[10],
178 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
179 regs
->u_regs
[12], regs
->u_regs
[13], regs
->u_regs
[14],
181 printk("RPC: <%pS>\n", (void *) regs
->u_regs
[15]);
182 show_regwindow(regs
);
183 show_stack(current
, (unsigned long *) regs
->u_regs
[UREG_FP
]);
186 union global_cpu_snapshot global_cpu_snapshot
[NR_CPUS
];
187 static DEFINE_SPINLOCK(global_cpu_snapshot_lock
);
189 static void __global_reg_self(struct thread_info
*tp
, struct pt_regs
*regs
,
192 struct global_reg_snapshot
*rp
;
196 rp
= &global_cpu_snapshot
[this_cpu
].reg
;
198 rp
->tstate
= regs
->tstate
;
200 rp
->tnpc
= regs
->tnpc
;
201 rp
->o7
= regs
->u_regs
[UREG_I7
];
203 if (regs
->tstate
& TSTATE_PRIV
) {
204 struct reg_window
*rw
;
206 rw
= (struct reg_window
*)
207 (regs
->u_regs
[UREG_FP
] + STACK_BIAS
);
208 if (kstack_valid(tp
, (unsigned long) rw
)) {
210 rw
= (struct reg_window
*)
211 (rw
->ins
[6] + STACK_BIAS
);
212 if (kstack_valid(tp
, (unsigned long) rw
))
213 rp
->rpc
= rw
->ins
[7];
222 /* In order to avoid hangs we do not try to synchronize with the
223 * global register dump client cpus. The last store they make is to
224 * the thread pointer, so do a short poll waiting for that to become
227 static void __global_reg_poll(struct global_reg_snapshot
*gp
)
231 while (!gp
->thread
&& ++limit
< 100) {
237 void arch_trigger_all_cpu_backtrace(void)
239 struct thread_info
*tp
= current_thread_info();
240 struct pt_regs
*regs
= get_irq_regs();
247 spin_lock_irqsave(&global_cpu_snapshot_lock
, flags
);
249 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
251 this_cpu
= raw_smp_processor_id();
253 __global_reg_self(tp
, regs
, this_cpu
);
255 smp_fetch_global_regs();
257 for_each_online_cpu(cpu
) {
258 struct global_reg_snapshot
*gp
= &global_cpu_snapshot
[cpu
].reg
;
260 __global_reg_poll(gp
);
263 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
264 (cpu
== this_cpu
? '*' : ' '), cpu
,
265 gp
->tstate
, gp
->tpc
, gp
->tnpc
,
266 ((tp
&& tp
->task
) ? tp
->task
->comm
: "NULL"),
267 ((tp
&& tp
->task
) ? tp
->task
->pid
: -1));
269 if (gp
->tstate
& TSTATE_PRIV
) {
270 printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
276 printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
277 gp
->tpc
, gp
->o7
, gp
->i7
, gp
->rpc
);
281 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
283 spin_unlock_irqrestore(&global_cpu_snapshot_lock
, flags
);
286 #ifdef CONFIG_MAGIC_SYSRQ
288 static void sysrq_handle_globreg(int key
)
290 arch_trigger_all_cpu_backtrace();
293 static struct sysrq_key_op sparc_globalreg_op
= {
294 .handler
= sysrq_handle_globreg
,
295 .help_msg
= "global-regs(Y)",
296 .action_msg
= "Show Global CPU Regs",
299 static void __global_pmu_self(int this_cpu
)
301 struct global_pmu_snapshot
*pp
;
304 pp
= &global_cpu_snapshot
[this_cpu
].pmu
;
307 if (tlb_type
== hypervisor
&&
308 sun4v_chip_type
>= SUN4V_CHIP_NIAGARA4
)
311 for (i
= 0; i
< num
; i
++) {
312 pp
->pcr
[i
] = pcr_ops
->read_pcr(i
);
313 pp
->pic
[i
] = pcr_ops
->read_pic(i
);
317 static void __global_pmu_poll(struct global_pmu_snapshot
*pp
)
321 while (!pp
->pcr
[0] && ++limit
< 100) {
327 static void pmu_snapshot_all_cpus(void)
332 spin_lock_irqsave(&global_cpu_snapshot_lock
, flags
);
334 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
336 this_cpu
= raw_smp_processor_id();
338 __global_pmu_self(this_cpu
);
340 smp_fetch_global_pmu();
342 for_each_online_cpu(cpu
) {
343 struct global_pmu_snapshot
*pp
= &global_cpu_snapshot
[cpu
].pmu
;
345 __global_pmu_poll(pp
);
347 printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n",
348 (cpu
== this_cpu
? '*' : ' '), cpu
,
349 pp
->pcr
[0], pp
->pcr
[1], pp
->pcr
[2], pp
->pcr
[3],
350 pp
->pic
[0], pp
->pic
[1], pp
->pic
[2], pp
->pic
[3]);
353 memset(global_cpu_snapshot
, 0, sizeof(global_cpu_snapshot
));
355 spin_unlock_irqrestore(&global_cpu_snapshot_lock
, flags
);
358 static void sysrq_handle_globpmu(int key
)
360 pmu_snapshot_all_cpus();
363 static struct sysrq_key_op sparc_globalpmu_op
= {
364 .handler
= sysrq_handle_globpmu
,
365 .help_msg
= "global-pmu(X)",
366 .action_msg
= "Show Global PMU Regs",
369 static int __init
sparc_sysrq_init(void)
371 int ret
= register_sysrq_key('y', &sparc_globalreg_op
);
374 ret
= register_sysrq_key('x', &sparc_globalpmu_op
);
378 core_initcall(sparc_sysrq_init
);
382 unsigned long thread_saved_pc(struct task_struct
*tsk
)
384 struct thread_info
*ti
= task_thread_info(tsk
);
385 unsigned long ret
= 0xdeadbeefUL
;
389 sp
= (unsigned long *)(ti
->ksp
+ STACK_BIAS
);
390 if (((unsigned long)sp
& (sizeof(long) - 1)) == 0UL &&
393 fp
= (unsigned long *)(sp
[14] + STACK_BIAS
);
394 if (((unsigned long)fp
& (sizeof(long) - 1)) == 0UL)
401 /* Free current thread data structures etc.. */
402 void exit_thread(void)
404 struct thread_info
*t
= current_thread_info();
407 if (t
->utraps
[0] < 2)
414 void flush_thread(void)
416 struct thread_info
*t
= current_thread_info();
417 struct mm_struct
*mm
;
421 tsb_context_switch(mm
);
423 set_thread_wsaved(0);
425 /* Clear FPU register state. */
429 /* It's a bit more tricky when 64-bit tasks are involved... */
430 static unsigned long clone_stackframe(unsigned long csp
, unsigned long psp
)
432 bool stack_64bit
= test_thread_64bit_stack(psp
);
433 unsigned long fp
, distance
, rval
;
438 __get_user(fp
, &(((struct reg_window __user
*)psp
)->ins
[6]));
440 if (test_thread_flag(TIF_32BIT
))
443 __get_user(fp
, &(((struct reg_window32 __user
*)psp
)->ins
[6]));
445 /* Now align the stack as this is mandatory in the Sparc ABI
446 * due to how register windows work. This hides the
447 * restriction from thread libraries etc.
452 rval
= (csp
- distance
);
453 if (copy_in_user((void __user
*) rval
, (void __user
*) psp
, distance
))
455 else if (!stack_64bit
) {
456 if (put_user(((u32
)csp
),
457 &(((struct reg_window32 __user
*)rval
)->ins
[6])))
460 if (put_user(((u64
)csp
- STACK_BIAS
),
461 &(((struct reg_window __user
*)rval
)->ins
[6])))
464 rval
= rval
- STACK_BIAS
;
470 /* Standard stuff. */
471 static inline void shift_window_buffer(int first_win
, int last_win
,
472 struct thread_info
*t
)
476 for (i
= first_win
; i
< last_win
; i
++) {
477 t
->rwbuf_stkptrs
[i
] = t
->rwbuf_stkptrs
[i
+1];
478 memcpy(&t
->reg_window
[i
], &t
->reg_window
[i
+1],
479 sizeof(struct reg_window
));
483 void synchronize_user_stack(void)
485 struct thread_info
*t
= current_thread_info();
486 unsigned long window
;
488 flush_user_windows();
489 if ((window
= get_thread_wsaved()) != 0) {
492 struct reg_window
*rwin
= &t
->reg_window
[window
];
493 int winsize
= sizeof(struct reg_window
);
496 sp
= t
->rwbuf_stkptrs
[window
];
498 if (test_thread_64bit_stack(sp
))
501 winsize
= sizeof(struct reg_window32
);
503 if (!copy_to_user((char __user
*)sp
, rwin
, winsize
)) {
504 shift_window_buffer(window
, get_thread_wsaved() - 1, t
);
505 set_thread_wsaved(get_thread_wsaved() - 1);
511 static void stack_unaligned(unsigned long sp
)
515 info
.si_signo
= SIGBUS
;
517 info
.si_code
= BUS_ADRALN
;
518 info
.si_addr
= (void __user
*) sp
;
520 force_sig_info(SIGBUS
, &info
, current
);
523 void fault_in_user_windows(void)
525 struct thread_info
*t
= current_thread_info();
526 unsigned long window
;
528 flush_user_windows();
529 window
= get_thread_wsaved();
531 if (likely(window
!= 0)) {
534 struct reg_window
*rwin
= &t
->reg_window
[window
];
535 int winsize
= sizeof(struct reg_window
);
538 sp
= t
->rwbuf_stkptrs
[window
];
540 if (test_thread_64bit_stack(sp
))
543 winsize
= sizeof(struct reg_window32
);
545 if (unlikely(sp
& 0x7UL
))
548 if (unlikely(copy_to_user((char __user
*)sp
,
553 set_thread_wsaved(0);
557 set_thread_wsaved(window
+ 1);
561 asmlinkage
long sparc_do_fork(unsigned long clone_flags
,
562 unsigned long stack_start
,
563 struct pt_regs
*regs
,
564 unsigned long stack_size
)
566 int __user
*parent_tid_ptr
, *child_tid_ptr
;
567 unsigned long orig_i1
= regs
->u_regs
[UREG_I1
];
571 if (test_thread_flag(TIF_32BIT
)) {
572 parent_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I2
]);
573 child_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I4
]);
577 parent_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I2
];
578 child_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I4
];
581 ret
= do_fork(clone_flags
, stack_start
, stack_size
,
582 parent_tid_ptr
, child_tid_ptr
);
584 /* If we get an error and potentially restart the system
585 * call, we're screwed because copy_thread() clobbered
586 * the parent's %o1. So detect that case and restore it
589 if ((unsigned long)ret
>= -ERESTART_RESTARTBLOCK
)
590 regs
->u_regs
[UREG_I1
] = orig_i1
;
595 /* Copy a Sparc thread. The fork() return value conventions
596 * under SunOS are nothing short of bletcherous:
597 * Parent --> %o0 == childs pid, %o1 == 0
598 * Child --> %o0 == parents pid, %o1 == 1
600 int copy_thread(unsigned long clone_flags
, unsigned long sp
,
601 unsigned long arg
, struct task_struct
*p
)
603 struct thread_info
*t
= task_thread_info(p
);
604 struct pt_regs
*regs
= current_pt_regs();
605 struct sparc_stackf
*parent_sf
;
606 unsigned long child_stack_sz
;
607 char *child_trap_frame
;
609 /* Calculate offset to stack_frame & pt_regs */
610 child_stack_sz
= (STACKFRAME_SZ
+ TRACEREG_SZ
);
611 child_trap_frame
= (task_stack_page(p
) +
612 (THREAD_SIZE
- child_stack_sz
));
615 t
->ksp
= ((unsigned long) child_trap_frame
) - STACK_BIAS
;
616 t
->kregs
= (struct pt_regs
*) (child_trap_frame
+
617 sizeof(struct sparc_stackf
));
620 if (unlikely(p
->flags
& PF_KTHREAD
)) {
621 memset(child_trap_frame
, 0, child_stack_sz
);
622 __thread_flag_byte_ptr(t
)[TI_FLAG_BYTE_CWP
] =
623 (current_pt_regs()->tstate
+ 1) & TSTATE_CWP
;
624 t
->current_ds
= ASI_P
;
625 t
->kregs
->u_regs
[UREG_G1
] = sp
; /* function */
626 t
->kregs
->u_regs
[UREG_G2
] = arg
;
630 parent_sf
= ((struct sparc_stackf
*) regs
) - 1;
631 memcpy(child_trap_frame
, parent_sf
, child_stack_sz
);
632 if (t
->flags
& _TIF_32BIT
) {
633 sp
&= 0x00000000ffffffffUL
;
634 regs
->u_regs
[UREG_FP
] &= 0x00000000ffffffffUL
;
636 t
->kregs
->u_regs
[UREG_FP
] = sp
;
637 __thread_flag_byte_ptr(t
)[TI_FLAG_BYTE_CWP
] =
638 (regs
->tstate
+ 1) & TSTATE_CWP
;
639 t
->current_ds
= ASI_AIUS
;
640 if (sp
!= regs
->u_regs
[UREG_FP
]) {
643 csp
= clone_stackframe(sp
, regs
->u_regs
[UREG_FP
]);
646 t
->kregs
->u_regs
[UREG_FP
] = csp
;
651 /* Set the return value for the child. */
652 t
->kregs
->u_regs
[UREG_I0
] = current
->pid
;
653 t
->kregs
->u_regs
[UREG_I1
] = 1;
655 /* Set the second return value for the parent. */
656 regs
->u_regs
[UREG_I1
] = 0;
658 if (clone_flags
& CLONE_SETTLS
)
659 t
->kregs
->u_regs
[UREG_G7
] = regs
->u_regs
[UREG_I3
];
666 unsigned int pr_regs
[32];
667 unsigned long pr_dregs
[16];
669 unsigned int __unused
;
671 unsigned char pr_qcnt
;
672 unsigned char pr_q_entrysize
;
674 unsigned int pr_q
[64];
678 * fill in the fpu structure for a core dump.
680 int dump_fpu (struct pt_regs
* regs
, elf_fpregset_t
* fpregs
)
682 unsigned long *kfpregs
= current_thread_info()->fpregs
;
683 unsigned long fprs
= current_thread_info()->fpsaved
[0];
685 if (test_thread_flag(TIF_32BIT
)) {
686 elf_fpregset_t32
*fpregs32
= (elf_fpregset_t32
*)fpregs
;
689 memcpy(&fpregs32
->pr_fr
.pr_regs
[0], kfpregs
,
690 sizeof(unsigned int) * 32);
692 memset(&fpregs32
->pr_fr
.pr_regs
[0], 0,
693 sizeof(unsigned int) * 32);
694 fpregs32
->pr_qcnt
= 0;
695 fpregs32
->pr_q_entrysize
= 8;
696 memset(&fpregs32
->pr_q
[0], 0,
697 (sizeof(unsigned int) * 64));
698 if (fprs
& FPRS_FEF
) {
699 fpregs32
->pr_fsr
= (unsigned int) current_thread_info()->xfsr
[0];
702 fpregs32
->pr_fsr
= 0;
707 memcpy(&fpregs
->pr_regs
[0], kfpregs
,
708 sizeof(unsigned int) * 32);
710 memset(&fpregs
->pr_regs
[0], 0,
711 sizeof(unsigned int) * 32);
713 memcpy(&fpregs
->pr_regs
[16], kfpregs
+16,
714 sizeof(unsigned int) * 32);
716 memset(&fpregs
->pr_regs
[16], 0,
717 sizeof(unsigned int) * 32);
718 if(fprs
& FPRS_FEF
) {
719 fpregs
->pr_fsr
= current_thread_info()->xfsr
[0];
720 fpregs
->pr_gsr
= current_thread_info()->gsr
[0];
722 fpregs
->pr_fsr
= fpregs
->pr_gsr
= 0;
724 fpregs
->pr_fprs
= fprs
;
728 EXPORT_SYMBOL(dump_fpu
);
730 unsigned long get_wchan(struct task_struct
*task
)
732 unsigned long pc
, fp
, bias
= 0;
733 struct thread_info
*tp
;
734 struct reg_window
*rw
;
735 unsigned long ret
= 0;
738 if (!task
|| task
== current
||
739 task
->state
== TASK_RUNNING
)
742 tp
= task_thread_info(task
);
744 fp
= task_thread_info(task
)->ksp
+ bias
;
747 if (!kstack_valid(tp
, fp
))
749 rw
= (struct reg_window
*) fp
;
751 if (!in_sched_functions(pc
)) {
755 fp
= rw
->ins
[6] + bias
;
756 } while (++count
< 16);