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/module.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/reboot.h>
26 #include <linux/delay.h>
27 #include <linux/compat.h>
28 #include <linux/tick.h>
29 #include <linux/init.h>
30 #include <linux/cpu.h>
31 #include <linux/elfcore.h>
32 #include <linux/sysrq.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>
52 #include <asm/irq_regs.h>
57 static void sparc64_yield(int cpu
)
59 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_stop_sched_tick(1);
101 while (!need_resched() && !cpu_is_offline(cpu
))
104 tick_nohz_restart_sched_tick();
106 preempt_enable_no_resched();
108 #ifdef CONFIG_HOTPLUG_CPU
109 if (cpu_is_offline(cpu
))
118 void machine_halt(void)
122 panic("Halt failed!");
125 void machine_alt_power_off(void)
128 prom_halt_power_off();
129 panic("Power-off failed!");
132 void machine_restart(char * cmd
)
137 p
= strchr (reboot_command
, '\n');
142 prom_reboot(reboot_command
);
144 panic("Reboot failed!");
148 static void show_regwindow32(struct pt_regs
*regs
)
150 struct reg_window32 __user
*rw
;
151 struct reg_window32 r_w
;
154 __asm__
__volatile__ ("flushw");
155 rw
= compat_ptr((unsigned)regs
->u_regs
[14]);
158 if (copy_from_user (&r_w
, rw
, sizeof(r_w
))) {
164 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
165 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
166 r_w
.locals
[0], r_w
.locals
[1], r_w
.locals
[2], r_w
.locals
[3],
167 r_w
.locals
[4], r_w
.locals
[5], r_w
.locals
[6], r_w
.locals
[7]);
168 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
169 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
170 r_w
.ins
[0], r_w
.ins
[1], r_w
.ins
[2], r_w
.ins
[3],
171 r_w
.ins
[4], r_w
.ins
[5], r_w
.ins
[6], r_w
.ins
[7]);
174 #define show_regwindow32(regs) do { } while (0)
177 static void show_regwindow(struct pt_regs
*regs
)
179 struct reg_window __user
*rw
;
180 struct reg_window
*rwk
;
181 struct reg_window r_w
;
184 if ((regs
->tstate
& TSTATE_PRIV
) || !(test_thread_flag(TIF_32BIT
))) {
185 __asm__
__volatile__ ("flushw");
186 rw
= (struct reg_window __user
*)
187 (regs
->u_regs
[14] + STACK_BIAS
);
188 rwk
= (struct reg_window
*)
189 (regs
->u_regs
[14] + STACK_BIAS
);
190 if (!(regs
->tstate
& TSTATE_PRIV
)) {
193 if (copy_from_user (&r_w
, rw
, sizeof(r_w
))) {
201 show_regwindow32(regs
);
204 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
205 rwk
->locals
[0], rwk
->locals
[1], rwk
->locals
[2], rwk
->locals
[3]);
206 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
207 rwk
->locals
[4], rwk
->locals
[5], rwk
->locals
[6], rwk
->locals
[7]);
208 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
209 rwk
->ins
[0], rwk
->ins
[1], rwk
->ins
[2], rwk
->ins
[3]);
210 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
211 rwk
->ins
[4], rwk
->ins
[5], rwk
->ins
[6], rwk
->ins
[7]);
212 if (regs
->tstate
& TSTATE_PRIV
)
213 printk("I7: <%pS>\n", (void *) rwk
->ins
[7]);
216 void show_regs(struct pt_regs
*regs
)
218 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs
->tstate
,
219 regs
->tpc
, regs
->tnpc
, regs
->y
, print_tainted());
220 printk("TPC: <%pS>\n", (void *) regs
->tpc
);
221 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
222 regs
->u_regs
[0], regs
->u_regs
[1], regs
->u_regs
[2],
224 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
225 regs
->u_regs
[4], regs
->u_regs
[5], regs
->u_regs
[6],
227 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
228 regs
->u_regs
[8], regs
->u_regs
[9], regs
->u_regs
[10],
230 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
231 regs
->u_regs
[12], regs
->u_regs
[13], regs
->u_regs
[14],
233 printk("RPC: <%pS>\n", (void *) regs
->u_regs
[15]);
234 show_regwindow(regs
);
237 struct global_reg_snapshot global_reg_snapshot
[NR_CPUS
];
238 static DEFINE_SPINLOCK(global_reg_snapshot_lock
);
240 static void __global_reg_self(struct thread_info
*tp
, struct pt_regs
*regs
,
245 global_reg_snapshot
[this_cpu
].tstate
= regs
->tstate
;
246 global_reg_snapshot
[this_cpu
].tpc
= regs
->tpc
;
247 global_reg_snapshot
[this_cpu
].tnpc
= regs
->tnpc
;
248 global_reg_snapshot
[this_cpu
].o7
= regs
->u_regs
[UREG_I7
];
250 if (regs
->tstate
& TSTATE_PRIV
) {
251 struct thread_info
*tp
= current_thread_info();
252 struct reg_window
*rw
;
254 rw
= (struct reg_window
*)
255 (regs
->u_regs
[UREG_FP
] + STACK_BIAS
);
256 if (kstack_valid(tp
, (unsigned long) rw
)) {
257 global_reg_snapshot
[this_cpu
].i7
= rw
->ins
[7];
258 rw
= (struct reg_window
*)
259 (rw
->ins
[6] + STACK_BIAS
);
260 if (kstack_valid(tp
, (unsigned long) rw
))
261 global_reg_snapshot
[this_cpu
].rpc
= rw
->ins
[7];
264 global_reg_snapshot
[this_cpu
].i7
= 0;
265 global_reg_snapshot
[this_cpu
].rpc
= 0;
267 global_reg_snapshot
[this_cpu
].thread
= tp
;
270 /* In order to avoid hangs we do not try to synchronize with the
271 * global register dump client cpus. The last store they make is to
272 * the thread pointer, so do a short poll waiting for that to become
275 static void __global_reg_poll(struct global_reg_snapshot
*gp
)
279 while (!gp
->thread
&& ++limit
< 100) {
285 void __trigger_all_cpu_backtrace(void)
287 struct thread_info
*tp
= current_thread_info();
288 struct pt_regs
*regs
= get_irq_regs();
295 spin_lock_irqsave(&global_reg_snapshot_lock
, flags
);
297 memset(global_reg_snapshot
, 0, sizeof(global_reg_snapshot
));
299 this_cpu
= raw_smp_processor_id();
301 __global_reg_self(tp
, regs
, this_cpu
);
303 smp_fetch_global_regs();
305 for_each_online_cpu(cpu
) {
306 struct global_reg_snapshot
*gp
= &global_reg_snapshot
[cpu
];
307 struct thread_info
*tp
;
309 __global_reg_poll(gp
);
312 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
313 (cpu
== this_cpu
? '*' : ' '), cpu
,
314 gp
->tstate
, gp
->tpc
, gp
->tnpc
,
315 ((tp
&& tp
->task
) ? tp
->task
->comm
: "NULL"),
316 ((tp
&& tp
->task
) ? tp
->task
->pid
: -1));
318 if (gp
->tstate
& TSTATE_PRIV
) {
319 printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
325 printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
326 gp
->tpc
, gp
->o7
, gp
->i7
, gp
->rpc
);
330 memset(global_reg_snapshot
, 0, sizeof(global_reg_snapshot
));
332 spin_unlock_irqrestore(&global_reg_snapshot_lock
, flags
);
335 #ifdef CONFIG_MAGIC_SYSRQ
337 static void sysrq_handle_globreg(int key
, struct tty_struct
*tty
)
339 __trigger_all_cpu_backtrace();
342 static struct sysrq_key_op sparc_globalreg_op
= {
343 .handler
= sysrq_handle_globreg
,
344 .help_msg
= "Globalregs",
345 .action_msg
= "Show Global CPU Regs",
348 static int __init
sparc_globreg_init(void)
350 return register_sysrq_key('y', &sparc_globalreg_op
);
353 core_initcall(sparc_globreg_init
);
357 unsigned long thread_saved_pc(struct task_struct
*tsk
)
359 struct thread_info
*ti
= task_thread_info(tsk
);
360 unsigned long ret
= 0xdeadbeefUL
;
364 sp
= (unsigned long *)(ti
->ksp
+ STACK_BIAS
);
365 if (((unsigned long)sp
& (sizeof(long) - 1)) == 0UL &&
368 fp
= (unsigned long *)(sp
[14] + STACK_BIAS
);
369 if (((unsigned long)fp
& (sizeof(long) - 1)) == 0UL)
376 /* Free current thread data structures etc.. */
377 void exit_thread(void)
379 struct thread_info
*t
= current_thread_info();
382 if (t
->utraps
[0] < 2)
388 if (test_and_clear_thread_flag(TIF_PERFCTR
)) {
389 t
->user_cntd0
= t
->user_cntd1
= NULL
;
395 void flush_thread(void)
397 struct thread_info
*t
= current_thread_info();
398 struct mm_struct
*mm
;
400 if (test_ti_thread_flag(t
, TIF_ABI_PENDING
)) {
401 clear_ti_thread_flag(t
, TIF_ABI_PENDING
);
402 if (test_ti_thread_flag(t
, TIF_32BIT
))
403 clear_ti_thread_flag(t
, TIF_32BIT
);
405 set_ti_thread_flag(t
, TIF_32BIT
);
410 tsb_context_switch(mm
);
412 set_thread_wsaved(0);
414 /* Turn off performance counters if on. */
415 if (test_and_clear_thread_flag(TIF_PERFCTR
)) {
416 t
->user_cntd0
= t
->user_cntd1
= NULL
;
421 /* Clear FPU register state. */
424 if (get_thread_current_ds() != ASI_AIUS
)
428 /* It's a bit more tricky when 64-bit tasks are involved... */
429 static unsigned long clone_stackframe(unsigned long csp
, unsigned long psp
)
431 unsigned long fp
, distance
, rval
;
433 if (!(test_thread_flag(TIF_32BIT
))) {
436 __get_user(fp
, &(((struct reg_window __user
*)psp
)->ins
[6]));
439 __get_user(fp
, &(((struct reg_window32 __user
*)psp
)->ins
[6]));
441 /* Now 8-byte align the stack as this is mandatory in the
442 * Sparc ABI due to how register windows work. This hides
443 * the restriction from thread libraries etc. -DaveM
448 rval
= (csp
- distance
);
449 if (copy_in_user((void __user
*) rval
, (void __user
*) psp
, distance
))
451 else if (test_thread_flag(TIF_32BIT
)) {
452 if (put_user(((u32
)csp
),
453 &(((struct reg_window32 __user
*)rval
)->ins
[6])))
456 if (put_user(((u64
)csp
- STACK_BIAS
),
457 &(((struct reg_window __user
*)rval
)->ins
[6])))
460 rval
= rval
- STACK_BIAS
;
466 /* Standard stuff. */
467 static inline void shift_window_buffer(int first_win
, int last_win
,
468 struct thread_info
*t
)
472 for (i
= first_win
; i
< last_win
; i
++) {
473 t
->rwbuf_stkptrs
[i
] = t
->rwbuf_stkptrs
[i
+1];
474 memcpy(&t
->reg_window
[i
], &t
->reg_window
[i
+1],
475 sizeof(struct reg_window
));
479 void synchronize_user_stack(void)
481 struct thread_info
*t
= current_thread_info();
482 unsigned long window
;
484 flush_user_windows();
485 if ((window
= get_thread_wsaved()) != 0) {
486 int winsize
= sizeof(struct reg_window
);
489 if (test_thread_flag(TIF_32BIT
))
490 winsize
= sizeof(struct reg_window32
);
496 unsigned long sp
= (t
->rwbuf_stkptrs
[window
] + bias
);
497 struct reg_window
*rwin
= &t
->reg_window
[window
];
499 if (!copy_to_user((char __user
*)sp
, rwin
, winsize
)) {
500 shift_window_buffer(window
, get_thread_wsaved() - 1, t
);
501 set_thread_wsaved(get_thread_wsaved() - 1);
507 static void stack_unaligned(unsigned long sp
)
511 info
.si_signo
= SIGBUS
;
513 info
.si_code
= BUS_ADRALN
;
514 info
.si_addr
= (void __user
*) sp
;
516 force_sig_info(SIGBUS
, &info
, current
);
519 void fault_in_user_windows(void)
521 struct thread_info
*t
= current_thread_info();
522 unsigned long window
;
523 int winsize
= sizeof(struct reg_window
);
526 if (test_thread_flag(TIF_32BIT
))
527 winsize
= sizeof(struct reg_window32
);
531 flush_user_windows();
532 window
= get_thread_wsaved();
534 if (likely(window
!= 0)) {
537 unsigned long sp
= (t
->rwbuf_stkptrs
[window
] + bias
);
538 struct reg_window
*rwin
= &t
->reg_window
[window
];
540 if (unlikely(sp
& 0x7UL
))
543 if (unlikely(copy_to_user((char __user
*)sp
,
548 set_thread_wsaved(0);
552 set_thread_wsaved(window
+ 1);
556 asmlinkage
long sparc_do_fork(unsigned long clone_flags
,
557 unsigned long stack_start
,
558 struct pt_regs
*regs
,
559 unsigned long stack_size
)
561 int __user
*parent_tid_ptr
, *child_tid_ptr
;
562 unsigned long orig_i1
= regs
->u_regs
[UREG_I1
];
566 if (test_thread_flag(TIF_32BIT
)) {
567 parent_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I2
]);
568 child_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I4
]);
572 parent_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I2
];
573 child_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I4
];
576 ret
= do_fork(clone_flags
, stack_start
,
578 parent_tid_ptr
, child_tid_ptr
);
580 /* If we get an error and potentially restart the system
581 * call, we're screwed because copy_thread() clobbered
582 * the parent's %o1. So detect that case and restore it
585 if ((unsigned long)ret
>= -ERESTART_RESTARTBLOCK
)
586 regs
->u_regs
[UREG_I1
] = orig_i1
;
591 /* Copy a Sparc thread. The fork() return value conventions
592 * under SunOS are nothing short of bletcherous:
593 * Parent --> %o0 == childs pid, %o1 == 0
594 * Child --> %o0 == parents pid, %o1 == 1
596 int copy_thread(int nr
, unsigned long clone_flags
, unsigned long sp
,
597 unsigned long unused
,
598 struct task_struct
*p
, struct pt_regs
*regs
)
600 struct thread_info
*t
= task_thread_info(p
);
601 struct sparc_stackf
*parent_sf
;
602 unsigned long child_stack_sz
;
603 char *child_trap_frame
;
606 kernel_thread
= (regs
->tstate
& TSTATE_PRIV
) ? 1 : 0;
607 parent_sf
= ((struct sparc_stackf
*) regs
) - 1;
609 /* Calculate offset to stack_frame & pt_regs */
610 child_stack_sz
= ((STACKFRAME_SZ
+ TRACEREG_SZ
) +
611 (kernel_thread
? STACKFRAME_SZ
: 0));
612 child_trap_frame
= (task_stack_page(p
) +
613 (THREAD_SIZE
- child_stack_sz
));
614 memcpy(child_trap_frame
, parent_sf
, child_stack_sz
);
616 t
->flags
= (t
->flags
& ~((0xffUL
<< TI_FLAG_CWP_SHIFT
) |
617 (0xffUL
<< TI_FLAG_CURRENT_DS_SHIFT
))) |
618 (((regs
->tstate
+ 1) & TSTATE_CWP
) << TI_FLAG_CWP_SHIFT
);
620 t
->ksp
= ((unsigned long) child_trap_frame
) - STACK_BIAS
;
621 t
->kregs
= (struct pt_regs
*) (child_trap_frame
+
622 sizeof(struct sparc_stackf
));
626 struct sparc_stackf
*child_sf
= (struct sparc_stackf
*)
627 (child_trap_frame
+ (STACKFRAME_SZ
+ TRACEREG_SZ
));
629 /* Zero terminate the stack backtrace. */
631 t
->kregs
->u_regs
[UREG_FP
] =
632 ((unsigned long) child_sf
) - STACK_BIAS
;
634 /* Special case, if we are spawning a kernel thread from
635 * a userspace task (usermode helper, NFS or similar), we
636 * must disable performance counters in the child because
637 * the address space and protection realm are changing.
639 if (t
->flags
& _TIF_PERFCTR
) {
640 t
->user_cntd0
= t
->user_cntd1
= NULL
;
642 t
->flags
&= ~_TIF_PERFCTR
;
644 t
->flags
|= ((long)ASI_P
<< TI_FLAG_CURRENT_DS_SHIFT
);
645 t
->kregs
->u_regs
[UREG_G6
] = (unsigned long) t
;
646 t
->kregs
->u_regs
[UREG_G4
] = (unsigned long) t
->task
;
648 if (t
->flags
& _TIF_32BIT
) {
649 sp
&= 0x00000000ffffffffUL
;
650 regs
->u_regs
[UREG_FP
] &= 0x00000000ffffffffUL
;
652 t
->kregs
->u_regs
[UREG_FP
] = sp
;
653 t
->flags
|= ((long)ASI_AIUS
<< TI_FLAG_CURRENT_DS_SHIFT
);
654 if (sp
!= regs
->u_regs
[UREG_FP
]) {
657 csp
= clone_stackframe(sp
, regs
->u_regs
[UREG_FP
]);
660 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
];
680 * This is the mechanism for creating a new kernel thread.
682 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
683 * who haven't done an "execve()") should use this: it will work within
684 * a system call from a "real" process, but the process memory space will
685 * not be freed until both the parent and the child have exited.
687 pid_t
kernel_thread(int (*fn
)(void *), void * arg
, unsigned long flags
)
691 /* If the parent runs before fn(arg) is called by the child,
692 * the input registers of this function can be clobbered.
693 * So we stash 'fn' and 'arg' into global registers which
694 * will not be modified by the parent.
696 __asm__
__volatile__("mov %4, %%g2\n\t" /* Save FN into global */
697 "mov %5, %%g3\n\t" /* Save ARG into global */
698 "mov %1, %%g1\n\t" /* Clone syscall nr. */
699 "mov %2, %%o0\n\t" /* Clone flags. */
700 "mov 0, %%o1\n\t" /* usp arg == 0 */
701 "t 0x6d\n\t" /* Linux/Sparc clone(). */
702 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
704 "jmpl %%g2, %%o7\n\t" /* Call the function. */
705 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
707 "t 0x6d\n\t" /* Linux/Sparc exit(). */
708 /* Notreached by child. */
711 "i" (__NR_clone
), "r" (flags
| CLONE_VM
| CLONE_UNTRACED
),
712 "i" (__NR_exit
), "r" (fn
), "r" (arg
) :
713 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
719 unsigned int pr_regs
[32];
720 unsigned long pr_dregs
[16];
722 unsigned int __unused
;
724 unsigned char pr_qcnt
;
725 unsigned char pr_q_entrysize
;
727 unsigned int pr_q
[64];
731 * fill in the fpu structure for a core dump.
733 int dump_fpu (struct pt_regs
* regs
, elf_fpregset_t
* fpregs
)
735 unsigned long *kfpregs
= current_thread_info()->fpregs
;
736 unsigned long fprs
= current_thread_info()->fpsaved
[0];
738 if (test_thread_flag(TIF_32BIT
)) {
739 elf_fpregset_t32
*fpregs32
= (elf_fpregset_t32
*)fpregs
;
742 memcpy(&fpregs32
->pr_fr
.pr_regs
[0], kfpregs
,
743 sizeof(unsigned int) * 32);
745 memset(&fpregs32
->pr_fr
.pr_regs
[0], 0,
746 sizeof(unsigned int) * 32);
747 fpregs32
->pr_qcnt
= 0;
748 fpregs32
->pr_q_entrysize
= 8;
749 memset(&fpregs32
->pr_q
[0], 0,
750 (sizeof(unsigned int) * 64));
751 if (fprs
& FPRS_FEF
) {
752 fpregs32
->pr_fsr
= (unsigned int) current_thread_info()->xfsr
[0];
755 fpregs32
->pr_fsr
= 0;
760 memcpy(&fpregs
->pr_regs
[0], kfpregs
,
761 sizeof(unsigned int) * 32);
763 memset(&fpregs
->pr_regs
[0], 0,
764 sizeof(unsigned int) * 32);
766 memcpy(&fpregs
->pr_regs
[16], kfpregs
+16,
767 sizeof(unsigned int) * 32);
769 memset(&fpregs
->pr_regs
[16], 0,
770 sizeof(unsigned int) * 32);
771 if(fprs
& FPRS_FEF
) {
772 fpregs
->pr_fsr
= current_thread_info()->xfsr
[0];
773 fpregs
->pr_gsr
= current_thread_info()->gsr
[0];
775 fpregs
->pr_fsr
= fpregs
->pr_gsr
= 0;
777 fpregs
->pr_fprs
= fprs
;
783 * sparc_execve() executes a new program after the asm stub has set
784 * things up for us. This should basically do what I want it to.
786 asmlinkage
int sparc_execve(struct pt_regs
*regs
)
791 /* User register window flush is done by entry.S */
793 /* Check for indirect call. */
794 if (regs
->u_regs
[UREG_G1
] == 0)
797 filename
= getname((char __user
*)regs
->u_regs
[base
+ UREG_I0
]);
798 error
= PTR_ERR(filename
);
799 if (IS_ERR(filename
))
801 error
= do_execve(filename
,
802 (char __user
* __user
*)
803 regs
->u_regs
[base
+ UREG_I1
],
804 (char __user
* __user
*)
805 regs
->u_regs
[base
+ UREG_I2
], regs
);
809 current_thread_info()->xfsr
[0] = 0;
810 current_thread_info()->fpsaved
[0] = 0;
811 regs
->tstate
&= ~TSTATE_PEF
;
817 unsigned long get_wchan(struct task_struct
*task
)
819 unsigned long pc
, fp
, bias
= 0;
820 struct thread_info
*tp
;
821 struct reg_window
*rw
;
822 unsigned long ret
= 0;
825 if (!task
|| task
== current
||
826 task
->state
== TASK_RUNNING
)
829 tp
= task_thread_info(task
);
831 fp
= task_thread_info(task
)->ksp
+ bias
;
834 if (!kstack_valid(tp
, fp
))
836 rw
= (struct reg_window
*) fp
;
838 if (!in_sched_functions(pc
)) {
842 fp
= rw
->ins
[6] + bias
;
843 } while (++count
< 16);