1 /* arch/sparc64/kernel/process.c
3 * Copyright (C) 1995, 1996 David S. Miller (davem@caip.rutgers.edu)
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/module.h>
16 #include <linux/sched.h>
17 #include <linux/kernel.h>
18 #include <linux/kallsyms.h>
21 #include <linux/smp.h>
22 #include <linux/stddef.h>
23 #include <linux/ptrace.h>
24 #include <linux/slab.h>
25 #include <linux/user.h>
26 #include <linux/reboot.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/elfcore.h>
34 #include <asm/oplib.h>
35 #include <asm/uaccess.h>
36 #include <asm/system.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/sstate.h>
50 #include <asm/reboot.h>
51 #include <asm/syscalls.h>
53 /* #define VERBOSE_SHOWREGS */
55 static void sparc64_yield(int cpu
)
57 if (tlb_type
!= hypervisor
)
60 clear_thread_flag(TIF_POLLING_NRFLAG
);
61 smp_mb__after_clear_bit();
63 while (!need_resched() && !cpu_is_offline(cpu
)) {
66 /* Disable interrupts. */
68 "rdpr %%pstate, %0\n\t"
70 "wrpr %0, %%g0, %%pstate"
74 if (!need_resched() && !cpu_is_offline(cpu
))
77 /* Re-enable interrupts. */
79 "rdpr %%pstate, %0\n\t"
81 "wrpr %0, %%g0, %%pstate"
86 set_thread_flag(TIF_POLLING_NRFLAG
);
89 /* The idle loop on sparc64. */
92 int cpu
= smp_processor_id();
94 set_thread_flag(TIF_POLLING_NRFLAG
);
97 tick_nohz_stop_sched_tick();
99 while (!need_resched() && !cpu_is_offline(cpu
))
102 tick_nohz_restart_sched_tick();
104 preempt_enable_no_resched();
106 #ifdef CONFIG_HOTPLUG_CPU
107 if (cpu_is_offline(cpu
))
116 void machine_halt(void)
120 panic("Halt failed!");
123 void machine_alt_power_off(void)
126 prom_halt_power_off();
127 panic("Power-off failed!");
130 void machine_restart(char * cmd
)
135 p
= strchr (reboot_command
, '\n');
140 prom_reboot(reboot_command
);
142 panic("Reboot failed!");
146 static void show_regwindow32(struct pt_regs
*regs
)
148 struct reg_window32 __user
*rw
;
149 struct reg_window32 r_w
;
152 __asm__
__volatile__ ("flushw");
153 rw
= compat_ptr((unsigned)regs
->u_regs
[14]);
156 if (copy_from_user (&r_w
, rw
, sizeof(r_w
))) {
162 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
163 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
164 r_w
.locals
[0], r_w
.locals
[1], r_w
.locals
[2], r_w
.locals
[3],
165 r_w
.locals
[4], r_w
.locals
[5], r_w
.locals
[6], r_w
.locals
[7]);
166 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
167 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
168 r_w
.ins
[0], r_w
.ins
[1], r_w
.ins
[2], r_w
.ins
[3],
169 r_w
.ins
[4], r_w
.ins
[5], r_w
.ins
[6], r_w
.ins
[7]);
172 #define show_regwindow32(regs) do { } while (0)
175 static void show_regwindow(struct pt_regs
*regs
)
177 struct reg_window __user
*rw
;
178 struct reg_window
*rwk
;
179 struct reg_window r_w
;
182 if ((regs
->tstate
& TSTATE_PRIV
) || !(test_thread_flag(TIF_32BIT
))) {
183 __asm__
__volatile__ ("flushw");
184 rw
= (struct reg_window __user
*)
185 (regs
->u_regs
[14] + STACK_BIAS
);
186 rwk
= (struct reg_window
*)
187 (regs
->u_regs
[14] + STACK_BIAS
);
188 if (!(regs
->tstate
& TSTATE_PRIV
)) {
191 if (copy_from_user (&r_w
, rw
, sizeof(r_w
))) {
199 show_regwindow32(regs
);
202 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
203 rwk
->locals
[0], rwk
->locals
[1], rwk
->locals
[2], rwk
->locals
[3]);
204 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
205 rwk
->locals
[4], rwk
->locals
[5], rwk
->locals
[6], rwk
->locals
[7]);
206 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
207 rwk
->ins
[0], rwk
->ins
[1], rwk
->ins
[2], rwk
->ins
[3]);
208 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
209 rwk
->ins
[4], rwk
->ins
[5], rwk
->ins
[6], rwk
->ins
[7]);
210 if (regs
->tstate
& TSTATE_PRIV
)
211 print_symbol("I7: <%s>\n", rwk
->ins
[7]);
215 static DEFINE_SPINLOCK(regdump_lock
);
218 void __show_regs(struct pt_regs
* regs
)
223 /* Protect against xcall ipis which might lead to livelock on the lock */
224 __asm__
__volatile__("rdpr %%pstate, %0\n\t"
225 "wrpr %0, %1, %%pstate"
228 spin_lock(®dump_lock
);
230 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs
->tstate
,
231 regs
->tpc
, regs
->tnpc
, regs
->y
, print_tainted());
232 print_symbol("TPC: <%s>\n", regs
->tpc
);
233 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
234 regs
->u_regs
[0], regs
->u_regs
[1], regs
->u_regs
[2],
236 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
237 regs
->u_regs
[4], regs
->u_regs
[5], regs
->u_regs
[6],
239 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
240 regs
->u_regs
[8], regs
->u_regs
[9], regs
->u_regs
[10],
242 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
243 regs
->u_regs
[12], regs
->u_regs
[13], regs
->u_regs
[14],
245 print_symbol("RPC: <%s>\n", regs
->u_regs
[15]);
246 show_regwindow(regs
);
248 spin_unlock(®dump_lock
);
249 __asm__
__volatile__("wrpr %0, 0, %%pstate"
254 #ifdef VERBOSE_SHOWREGS
255 static void idump_from_user (unsigned int *pc
)
260 if((((unsigned long) pc
) & 3))
264 for(i
= -3; i
< 6; i
++) {
266 printk("%c%08x%c",i
?' ':'<',code
,i
?' ':'>');
273 void show_regs(struct pt_regs
*regs
)
275 #ifdef VERBOSE_SHOWREGS
276 extern long etrap
, etraptl1
;
282 extern void smp_report_regs(void);
289 #ifdef VERBOSE_SHOWREGS
290 if (regs
->tpc
>= &etrap
&& regs
->tpc
< &etraptl1
&&
291 regs
->u_regs
[14] >= (long)current
- PAGE_SIZE
&&
292 regs
->u_regs
[14] < (long)current
+ 6 * PAGE_SIZE
) {
293 printk ("*********parent**********\n");
294 __show_regs((struct pt_regs
*)(regs
->u_regs
[14] + PTREGS_OFF
));
295 idump_from_user(((struct pt_regs
*)(regs
->u_regs
[14] + PTREGS_OFF
))->tpc
);
296 printk ("*********endpar**********\n");
301 unsigned long thread_saved_pc(struct task_struct
*tsk
)
303 struct thread_info
*ti
= task_thread_info(tsk
);
304 unsigned long ret
= 0xdeadbeefUL
;
308 sp
= (unsigned long *)(ti
->ksp
+ STACK_BIAS
);
309 if (((unsigned long)sp
& (sizeof(long) - 1)) == 0UL &&
312 fp
= (unsigned long *)(sp
[14] + STACK_BIAS
);
313 if (((unsigned long)fp
& (sizeof(long) - 1)) == 0UL)
320 /* Free current thread data structures etc.. */
321 void exit_thread(void)
323 struct thread_info
*t
= current_thread_info();
326 if (t
->utraps
[0] < 2)
332 if (test_and_clear_thread_flag(TIF_PERFCTR
)) {
333 t
->user_cntd0
= t
->user_cntd1
= NULL
;
339 void flush_thread(void)
341 struct thread_info
*t
= current_thread_info();
342 struct mm_struct
*mm
;
344 if (test_ti_thread_flag(t
, TIF_ABI_PENDING
)) {
345 clear_ti_thread_flag(t
, TIF_ABI_PENDING
);
346 if (test_ti_thread_flag(t
, TIF_32BIT
))
347 clear_ti_thread_flag(t
, TIF_32BIT
);
349 set_ti_thread_flag(t
, TIF_32BIT
);
354 tsb_context_switch(mm
);
356 set_thread_wsaved(0);
358 /* Turn off performance counters if on. */
359 if (test_and_clear_thread_flag(TIF_PERFCTR
)) {
360 t
->user_cntd0
= t
->user_cntd1
= NULL
;
365 /* Clear FPU register state. */
368 if (get_thread_current_ds() != ASI_AIUS
)
372 /* It's a bit more tricky when 64-bit tasks are involved... */
373 static unsigned long clone_stackframe(unsigned long csp
, unsigned long psp
)
375 unsigned long fp
, distance
, rval
;
377 if (!(test_thread_flag(TIF_32BIT
))) {
380 __get_user(fp
, &(((struct reg_window __user
*)psp
)->ins
[6]));
383 __get_user(fp
, &(((struct reg_window32 __user
*)psp
)->ins
[6]));
385 /* Now 8-byte align the stack as this is mandatory in the
386 * Sparc ABI due to how register windows work. This hides
387 * the restriction from thread libraries etc. -DaveM
392 rval
= (csp
- distance
);
393 if (copy_in_user((void __user
*) rval
, (void __user
*) psp
, distance
))
395 else if (test_thread_flag(TIF_32BIT
)) {
396 if (put_user(((u32
)csp
),
397 &(((struct reg_window32 __user
*)rval
)->ins
[6])))
400 if (put_user(((u64
)csp
- STACK_BIAS
),
401 &(((struct reg_window __user
*)rval
)->ins
[6])))
404 rval
= rval
- STACK_BIAS
;
410 /* Standard stuff. */
411 static inline void shift_window_buffer(int first_win
, int last_win
,
412 struct thread_info
*t
)
416 for (i
= first_win
; i
< last_win
; i
++) {
417 t
->rwbuf_stkptrs
[i
] = t
->rwbuf_stkptrs
[i
+1];
418 memcpy(&t
->reg_window
[i
], &t
->reg_window
[i
+1],
419 sizeof(struct reg_window
));
423 void synchronize_user_stack(void)
425 struct thread_info
*t
= current_thread_info();
426 unsigned long window
;
428 flush_user_windows();
429 if ((window
= get_thread_wsaved()) != 0) {
430 int winsize
= sizeof(struct reg_window
);
433 if (test_thread_flag(TIF_32BIT
))
434 winsize
= sizeof(struct reg_window32
);
440 unsigned long sp
= (t
->rwbuf_stkptrs
[window
] + bias
);
441 struct reg_window
*rwin
= &t
->reg_window
[window
];
443 if (!copy_to_user((char __user
*)sp
, rwin
, winsize
)) {
444 shift_window_buffer(window
, get_thread_wsaved() - 1, t
);
445 set_thread_wsaved(get_thread_wsaved() - 1);
451 static void stack_unaligned(unsigned long sp
)
455 info
.si_signo
= SIGBUS
;
457 info
.si_code
= BUS_ADRALN
;
458 info
.si_addr
= (void __user
*) sp
;
460 force_sig_info(SIGBUS
, &info
, current
);
463 void fault_in_user_windows(void)
465 struct thread_info
*t
= current_thread_info();
466 unsigned long window
;
467 int winsize
= sizeof(struct reg_window
);
470 if (test_thread_flag(TIF_32BIT
))
471 winsize
= sizeof(struct reg_window32
);
475 flush_user_windows();
476 window
= get_thread_wsaved();
478 if (likely(window
!= 0)) {
481 unsigned long sp
= (t
->rwbuf_stkptrs
[window
] + bias
);
482 struct reg_window
*rwin
= &t
->reg_window
[window
];
484 if (unlikely(sp
& 0x7UL
))
487 if (unlikely(copy_to_user((char __user
*)sp
,
492 set_thread_wsaved(0);
496 set_thread_wsaved(window
+ 1);
500 asmlinkage
long sparc_do_fork(unsigned long clone_flags
,
501 unsigned long stack_start
,
502 struct pt_regs
*regs
,
503 unsigned long stack_size
)
505 int __user
*parent_tid_ptr
, *child_tid_ptr
;
506 unsigned long orig_i1
= regs
->u_regs
[UREG_I1
];
510 if (test_thread_flag(TIF_32BIT
)) {
511 parent_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I2
]);
512 child_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I4
]);
516 parent_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I2
];
517 child_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I4
];
520 ret
= do_fork(clone_flags
, stack_start
,
522 parent_tid_ptr
, child_tid_ptr
);
524 /* If we get an error and potentially restart the system
525 * call, we're screwed because copy_thread() clobbered
526 * the parent's %o1. So detect that case and restore it
529 if ((unsigned long)ret
>= -ERESTART_RESTARTBLOCK
)
530 regs
->u_regs
[UREG_I1
] = orig_i1
;
535 /* Copy a Sparc thread. The fork() return value conventions
536 * under SunOS are nothing short of bletcherous:
537 * Parent --> %o0 == childs pid, %o1 == 0
538 * Child --> %o0 == parents pid, %o1 == 1
540 int copy_thread(int nr
, unsigned long clone_flags
, unsigned long sp
,
541 unsigned long unused
,
542 struct task_struct
*p
, struct pt_regs
*regs
)
544 struct thread_info
*t
= task_thread_info(p
);
545 char *child_trap_frame
;
547 /* Calculate offset to stack_frame & pt_regs */
548 child_trap_frame
= task_stack_page(p
) + (THREAD_SIZE
- (TRACEREG_SZ
+STACKFRAME_SZ
));
549 memcpy(child_trap_frame
, (((struct sparc_stackf
*)regs
)-1), (TRACEREG_SZ
+STACKFRAME_SZ
));
551 t
->flags
= (t
->flags
& ~((0xffUL
<< TI_FLAG_CWP_SHIFT
) | (0xffUL
<< TI_FLAG_CURRENT_DS_SHIFT
))) |
552 (((regs
->tstate
+ 1) & TSTATE_CWP
) << TI_FLAG_CWP_SHIFT
);
554 t
->ksp
= ((unsigned long) child_trap_frame
) - STACK_BIAS
;
555 t
->kregs
= (struct pt_regs
*)(child_trap_frame
+sizeof(struct sparc_stackf
));
558 if (regs
->tstate
& TSTATE_PRIV
) {
559 /* Special case, if we are spawning a kernel thread from
560 * a userspace task (via KMOD, NFS, or similar) we must
561 * disable performance counters in the child because the
562 * address space and protection realm are changing.
564 if (t
->flags
& _TIF_PERFCTR
) {
565 t
->user_cntd0
= t
->user_cntd1
= NULL
;
567 t
->flags
&= ~_TIF_PERFCTR
;
569 t
->kregs
->u_regs
[UREG_FP
] = t
->ksp
;
570 t
->flags
|= ((long)ASI_P
<< TI_FLAG_CURRENT_DS_SHIFT
);
571 flush_register_windows();
572 memcpy((void *)(t
->ksp
+ STACK_BIAS
),
573 (void *)(regs
->u_regs
[UREG_FP
] + STACK_BIAS
),
574 sizeof(struct sparc_stackf
));
575 t
->kregs
->u_regs
[UREG_G6
] = (unsigned long) t
;
576 t
->kregs
->u_regs
[UREG_G4
] = (unsigned long) t
->task
;
578 if (t
->flags
& _TIF_32BIT
) {
579 sp
&= 0x00000000ffffffffUL
;
580 regs
->u_regs
[UREG_FP
] &= 0x00000000ffffffffUL
;
582 t
->kregs
->u_regs
[UREG_FP
] = sp
;
583 t
->flags
|= ((long)ASI_AIUS
<< TI_FLAG_CURRENT_DS_SHIFT
);
584 if (sp
!= regs
->u_regs
[UREG_FP
]) {
587 csp
= clone_stackframe(sp
, regs
->u_regs
[UREG_FP
]);
590 t
->kregs
->u_regs
[UREG_FP
] = csp
;
596 /* Set the return value for the child. */
597 t
->kregs
->u_regs
[UREG_I0
] = current
->pid
;
598 t
->kregs
->u_regs
[UREG_I1
] = 1;
600 /* Set the second return value for the parent. */
601 regs
->u_regs
[UREG_I1
] = 0;
603 if (clone_flags
& CLONE_SETTLS
)
604 t
->kregs
->u_regs
[UREG_G7
] = regs
->u_regs
[UREG_I3
];
610 * This is the mechanism for creating a new kernel thread.
612 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
613 * who haven't done an "execve()") should use this: it will work within
614 * a system call from a "real" process, but the process memory space will
615 * not be freed until both the parent and the child have exited.
617 pid_t
kernel_thread(int (*fn
)(void *), void * arg
, unsigned long flags
)
621 /* If the parent runs before fn(arg) is called by the child,
622 * the input registers of this function can be clobbered.
623 * So we stash 'fn' and 'arg' into global registers which
624 * will not be modified by the parent.
626 __asm__
__volatile__("mov %4, %%g2\n\t" /* Save FN into global */
627 "mov %5, %%g3\n\t" /* Save ARG into global */
628 "mov %1, %%g1\n\t" /* Clone syscall nr. */
629 "mov %2, %%o0\n\t" /* Clone flags. */
630 "mov 0, %%o1\n\t" /* usp arg == 0 */
631 "t 0x6d\n\t" /* Linux/Sparc clone(). */
632 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
634 "jmpl %%g2, %%o7\n\t" /* Call the function. */
635 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
637 "t 0x6d\n\t" /* Linux/Sparc exit(). */
638 /* Notreached by child. */
641 "i" (__NR_clone
), "r" (flags
| CLONE_VM
| CLONE_UNTRACED
),
642 "i" (__NR_exit
), "r" (fn
), "r" (arg
) :
643 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
649 unsigned int pr_regs
[32];
650 unsigned long pr_dregs
[16];
652 unsigned int __unused
;
654 unsigned char pr_qcnt
;
655 unsigned char pr_q_entrysize
;
657 unsigned int pr_q
[64];
661 * fill in the fpu structure for a core dump.
663 int dump_fpu (struct pt_regs
* regs
, elf_fpregset_t
* fpregs
)
665 unsigned long *kfpregs
= current_thread_info()->fpregs
;
666 unsigned long fprs
= current_thread_info()->fpsaved
[0];
668 if (test_thread_flag(TIF_32BIT
)) {
669 elf_fpregset_t32
*fpregs32
= (elf_fpregset_t32
*)fpregs
;
672 memcpy(&fpregs32
->pr_fr
.pr_regs
[0], kfpregs
,
673 sizeof(unsigned int) * 32);
675 memset(&fpregs32
->pr_fr
.pr_regs
[0], 0,
676 sizeof(unsigned int) * 32);
677 fpregs32
->pr_qcnt
= 0;
678 fpregs32
->pr_q_entrysize
= 8;
679 memset(&fpregs32
->pr_q
[0], 0,
680 (sizeof(unsigned int) * 64));
681 if (fprs
& FPRS_FEF
) {
682 fpregs32
->pr_fsr
= (unsigned int) current_thread_info()->xfsr
[0];
685 fpregs32
->pr_fsr
= 0;
690 memcpy(&fpregs
->pr_regs
[0], kfpregs
,
691 sizeof(unsigned int) * 32);
693 memset(&fpregs
->pr_regs
[0], 0,
694 sizeof(unsigned int) * 32);
696 memcpy(&fpregs
->pr_regs
[16], kfpregs
+16,
697 sizeof(unsigned int) * 32);
699 memset(&fpregs
->pr_regs
[16], 0,
700 sizeof(unsigned int) * 32);
701 if(fprs
& FPRS_FEF
) {
702 fpregs
->pr_fsr
= current_thread_info()->xfsr
[0];
703 fpregs
->pr_gsr
= current_thread_info()->gsr
[0];
705 fpregs
->pr_fsr
= fpregs
->pr_gsr
= 0;
707 fpregs
->pr_fprs
= fprs
;
713 * sparc_execve() executes a new program after the asm stub has set
714 * things up for us. This should basically do what I want it to.
716 asmlinkage
int sparc_execve(struct pt_regs
*regs
)
721 /* User register window flush is done by entry.S */
723 /* Check for indirect call. */
724 if (regs
->u_regs
[UREG_G1
] == 0)
727 filename
= getname((char __user
*)regs
->u_regs
[base
+ UREG_I0
]);
728 error
= PTR_ERR(filename
);
729 if (IS_ERR(filename
))
731 error
= do_execve(filename
,
732 (char __user
* __user
*)
733 regs
->u_regs
[base
+ UREG_I1
],
734 (char __user
* __user
*)
735 regs
->u_regs
[base
+ UREG_I2
], regs
);
739 current_thread_info()->xfsr
[0] = 0;
740 current_thread_info()->fpsaved
[0] = 0;
741 regs
->tstate
&= ~TSTATE_PEF
;
747 unsigned long get_wchan(struct task_struct
*task
)
749 unsigned long pc
, fp
, bias
= 0;
750 unsigned long thread_info_base
;
751 struct reg_window
*rw
;
752 unsigned long ret
= 0;
755 if (!task
|| task
== current
||
756 task
->state
== TASK_RUNNING
)
759 thread_info_base
= (unsigned long) task_stack_page(task
);
761 fp
= task_thread_info(task
)->ksp
+ bias
;
764 /* Bogus frame pointer? */
765 if (fp
< (thread_info_base
+ sizeof(struct thread_info
)) ||
766 fp
>= (thread_info_base
+ THREAD_SIZE
))
768 rw
= (struct reg_window
*) fp
;
770 if (!in_sched_functions(pc
)) {
774 fp
= rw
->ins
[6] + bias
;
775 } while (++count
< 16);