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 unsigned long fp
, distance
, rval
;
457 if (!(test_thread_flag(TIF_32BIT
))) {
460 __get_user(fp
, &(((struct reg_window __user
*)psp
)->ins
[6]));
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 (test_thread_flag(TIF_32BIT
)) {
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) {
510 int winsize
= sizeof(struct reg_window
);
513 if (test_thread_flag(TIF_32BIT
))
514 winsize
= sizeof(struct reg_window32
);
520 unsigned long sp
= (t
->rwbuf_stkptrs
[window
] + bias
);
521 struct reg_window
*rwin
= &t
->reg_window
[window
];
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
;
547 int winsize
= sizeof(struct reg_window
);
550 if (test_thread_flag(TIF_32BIT
))
551 winsize
= sizeof(struct reg_window32
);
555 flush_user_windows();
556 window
= get_thread_wsaved();
558 if (likely(window
!= 0)) {
561 unsigned long sp
= (t
->rwbuf_stkptrs
[window
] + bias
);
562 struct reg_window
*rwin
= &t
->reg_window
[window
];
564 if (unlikely(sp
& 0x7UL
))
567 if (unlikely(copy_to_user((char __user
*)sp
,
572 set_thread_wsaved(0);
576 set_thread_wsaved(window
+ 1);
580 asmlinkage
long sparc_do_fork(unsigned long clone_flags
,
581 unsigned long stack_start
,
582 struct pt_regs
*regs
,
583 unsigned long stack_size
)
585 int __user
*parent_tid_ptr
, *child_tid_ptr
;
586 unsigned long orig_i1
= regs
->u_regs
[UREG_I1
];
590 if (test_thread_flag(TIF_32BIT
)) {
591 parent_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I2
]);
592 child_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I4
]);
596 parent_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I2
];
597 child_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I4
];
600 ret
= do_fork(clone_flags
, stack_start
,
602 parent_tid_ptr
, child_tid_ptr
);
604 /* If we get an error and potentially restart the system
605 * call, we're screwed because copy_thread() clobbered
606 * the parent's %o1. So detect that case and restore it
609 if ((unsigned long)ret
>= -ERESTART_RESTARTBLOCK
)
610 regs
->u_regs
[UREG_I1
] = orig_i1
;
615 /* Copy a Sparc thread. The fork() return value conventions
616 * under SunOS are nothing short of bletcherous:
617 * Parent --> %o0 == childs pid, %o1 == 0
618 * Child --> %o0 == parents pid, %o1 == 1
620 int copy_thread(unsigned long clone_flags
, unsigned long sp
,
621 unsigned long unused
,
622 struct task_struct
*p
, struct pt_regs
*regs
)
624 struct thread_info
*t
= task_thread_info(p
);
625 struct sparc_stackf
*parent_sf
;
626 unsigned long child_stack_sz
;
627 char *child_trap_frame
;
630 kernel_thread
= (regs
->tstate
& TSTATE_PRIV
) ? 1 : 0;
631 parent_sf
= ((struct sparc_stackf
*) regs
) - 1;
633 /* Calculate offset to stack_frame & pt_regs */
634 child_stack_sz
= ((STACKFRAME_SZ
+ TRACEREG_SZ
) +
635 (kernel_thread
? STACKFRAME_SZ
: 0));
636 child_trap_frame
= (task_stack_page(p
) +
637 (THREAD_SIZE
- child_stack_sz
));
638 memcpy(child_trap_frame
, parent_sf
, child_stack_sz
);
640 t
->flags
= (t
->flags
& ~((0xffUL
<< TI_FLAG_CWP_SHIFT
) |
641 (0xffUL
<< TI_FLAG_CURRENT_DS_SHIFT
))) |
642 (((regs
->tstate
+ 1) & TSTATE_CWP
) << TI_FLAG_CWP_SHIFT
);
644 t
->ksp
= ((unsigned long) child_trap_frame
) - STACK_BIAS
;
645 t
->kregs
= (struct pt_regs
*) (child_trap_frame
+
646 sizeof(struct sparc_stackf
));
650 struct sparc_stackf
*child_sf
= (struct sparc_stackf
*)
651 (child_trap_frame
+ (STACKFRAME_SZ
+ TRACEREG_SZ
));
653 /* Zero terminate the stack backtrace. */
655 t
->kregs
->u_regs
[UREG_FP
] =
656 ((unsigned long) child_sf
) - STACK_BIAS
;
658 t
->flags
|= ((long)ASI_P
<< TI_FLAG_CURRENT_DS_SHIFT
);
659 t
->kregs
->u_regs
[UREG_G6
] = (unsigned long) t
;
660 t
->kregs
->u_regs
[UREG_G4
] = (unsigned long) t
->task
;
662 if (t
->flags
& _TIF_32BIT
) {
663 sp
&= 0x00000000ffffffffUL
;
664 regs
->u_regs
[UREG_FP
] &= 0x00000000ffffffffUL
;
666 t
->kregs
->u_regs
[UREG_FP
] = sp
;
667 t
->flags
|= ((long)ASI_AIUS
<< TI_FLAG_CURRENT_DS_SHIFT
);
668 if (sp
!= regs
->u_regs
[UREG_FP
]) {
671 csp
= clone_stackframe(sp
, regs
->u_regs
[UREG_FP
]);
674 t
->kregs
->u_regs
[UREG_FP
] = csp
;
680 /* Set the return value for the child. */
681 t
->kregs
->u_regs
[UREG_I0
] = current
->pid
;
682 t
->kregs
->u_regs
[UREG_I1
] = 1;
684 /* Set the second return value for the parent. */
685 regs
->u_regs
[UREG_I1
] = 0;
687 if (clone_flags
& CLONE_SETTLS
)
688 t
->kregs
->u_regs
[UREG_G7
] = regs
->u_regs
[UREG_I3
];
694 * This is the mechanism for creating a new kernel thread.
696 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
697 * who haven't done an "execve()") should use this: it will work within
698 * a system call from a "real" process, but the process memory space will
699 * not be freed until both the parent and the child have exited.
701 pid_t
kernel_thread(int (*fn
)(void *), void * arg
, unsigned long flags
)
705 /* If the parent runs before fn(arg) is called by the child,
706 * the input registers of this function can be clobbered.
707 * So we stash 'fn' and 'arg' into global registers which
708 * will not be modified by the parent.
710 __asm__
__volatile__("mov %4, %%g2\n\t" /* Save FN into global */
711 "mov %5, %%g3\n\t" /* Save ARG into global */
712 "mov %1, %%g1\n\t" /* Clone syscall nr. */
713 "mov %2, %%o0\n\t" /* Clone flags. */
714 "mov 0, %%o1\n\t" /* usp arg == 0 */
715 "t 0x6d\n\t" /* Linux/Sparc clone(). */
716 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
718 "jmpl %%g2, %%o7\n\t" /* Call the function. */
719 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
721 "t 0x6d\n\t" /* Linux/Sparc exit(). */
722 /* Notreached by child. */
725 "i" (__NR_clone
), "r" (flags
| CLONE_VM
| CLONE_UNTRACED
),
726 "i" (__NR_exit
), "r" (fn
), "r" (arg
) :
727 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
730 EXPORT_SYMBOL(kernel_thread
);
734 unsigned int pr_regs
[32];
735 unsigned long pr_dregs
[16];
737 unsigned int __unused
;
739 unsigned char pr_qcnt
;
740 unsigned char pr_q_entrysize
;
742 unsigned int pr_q
[64];
746 * fill in the fpu structure for a core dump.
748 int dump_fpu (struct pt_regs
* regs
, elf_fpregset_t
* fpregs
)
750 unsigned long *kfpregs
= current_thread_info()->fpregs
;
751 unsigned long fprs
= current_thread_info()->fpsaved
[0];
753 if (test_thread_flag(TIF_32BIT
)) {
754 elf_fpregset_t32
*fpregs32
= (elf_fpregset_t32
*)fpregs
;
757 memcpy(&fpregs32
->pr_fr
.pr_regs
[0], kfpregs
,
758 sizeof(unsigned int) * 32);
760 memset(&fpregs32
->pr_fr
.pr_regs
[0], 0,
761 sizeof(unsigned int) * 32);
762 fpregs32
->pr_qcnt
= 0;
763 fpregs32
->pr_q_entrysize
= 8;
764 memset(&fpregs32
->pr_q
[0], 0,
765 (sizeof(unsigned int) * 64));
766 if (fprs
& FPRS_FEF
) {
767 fpregs32
->pr_fsr
= (unsigned int) current_thread_info()->xfsr
[0];
770 fpregs32
->pr_fsr
= 0;
775 memcpy(&fpregs
->pr_regs
[0], kfpregs
,
776 sizeof(unsigned int) * 32);
778 memset(&fpregs
->pr_regs
[0], 0,
779 sizeof(unsigned int) * 32);
781 memcpy(&fpregs
->pr_regs
[16], kfpregs
+16,
782 sizeof(unsigned int) * 32);
784 memset(&fpregs
->pr_regs
[16], 0,
785 sizeof(unsigned int) * 32);
786 if(fprs
& FPRS_FEF
) {
787 fpregs
->pr_fsr
= current_thread_info()->xfsr
[0];
788 fpregs
->pr_gsr
= current_thread_info()->gsr
[0];
790 fpregs
->pr_fsr
= fpregs
->pr_gsr
= 0;
792 fpregs
->pr_fprs
= fprs
;
796 EXPORT_SYMBOL(dump_fpu
);
799 * sparc_execve() executes a new program after the asm stub has set
800 * things up for us. This should basically do what I want it to.
802 asmlinkage
int sparc_execve(struct pt_regs
*regs
)
805 struct filename
*filename
;
807 /* User register window flush is done by entry.S */
809 /* Check for indirect call. */
810 if (regs
->u_regs
[UREG_G1
] == 0)
813 filename
= getname((char __user
*)regs
->u_regs
[base
+ UREG_I0
]);
814 error
= PTR_ERR(filename
);
815 if (IS_ERR(filename
))
817 error
= do_execve(filename
->name
,
818 (const char __user
*const __user
*)
819 regs
->u_regs
[base
+ UREG_I1
],
820 (const char __user
*const __user
*)
821 regs
->u_regs
[base
+ UREG_I2
], regs
);
825 current_thread_info()->xfsr
[0] = 0;
826 current_thread_info()->fpsaved
[0] = 0;
827 regs
->tstate
&= ~TSTATE_PEF
;
833 unsigned long get_wchan(struct task_struct
*task
)
835 unsigned long pc
, fp
, bias
= 0;
836 struct thread_info
*tp
;
837 struct reg_window
*rw
;
838 unsigned long ret
= 0;
841 if (!task
|| task
== current
||
842 task
->state
== TASK_RUNNING
)
845 tp
= task_thread_info(task
);
847 fp
= task_thread_info(task
)->ksp
+ bias
;
850 if (!kstack_valid(tp
, fp
))
852 rw
= (struct reg_window
*) fp
;
854 if (!in_sched_functions(pc
)) {
858 fp
= rw
->ins
[6] + bias
;
859 } while (++count
< 16);