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/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/elfcore.h>
31 #include <linux/sysrq.h>
33 #include <asm/uaccess.h>
34 #include <asm/system.h>
36 #include <asm/pgalloc.h>
37 #include <asm/pgtable.h>
38 #include <asm/processor.h>
39 #include <asm/pstate.h>
41 #include <asm/fpumacro.h>
43 #include <asm/cpudata.h>
44 #include <asm/mmu_context.h>
45 #include <asm/unistd.h>
46 #include <asm/hypervisor.h>
47 #include <asm/syscalls.h>
48 #include <asm/irq_regs.h>
53 static void sparc64_yield(int cpu
)
55 if (tlb_type
!= hypervisor
)
58 clear_thread_flag(TIF_POLLING_NRFLAG
);
59 smp_mb__after_clear_bit();
61 while (!need_resched() && !cpu_is_offline(cpu
)) {
64 /* Disable interrupts. */
66 "rdpr %%pstate, %0\n\t"
68 "wrpr %0, %%g0, %%pstate"
72 if (!need_resched() && !cpu_is_offline(cpu
))
75 /* Re-enable interrupts. */
77 "rdpr %%pstate, %0\n\t"
79 "wrpr %0, %%g0, %%pstate"
84 set_thread_flag(TIF_POLLING_NRFLAG
);
87 /* The idle loop on sparc64. */
90 int cpu
= smp_processor_id();
92 set_thread_flag(TIF_POLLING_NRFLAG
);
95 tick_nohz_stop_sched_tick(1);
97 while (!need_resched() && !cpu_is_offline(cpu
))
100 tick_nohz_restart_sched_tick();
102 preempt_enable_no_resched();
104 #ifdef CONFIG_HOTPLUG_CPU
105 if (cpu_is_offline(cpu
))
115 static void show_regwindow32(struct pt_regs
*regs
)
117 struct reg_window32 __user
*rw
;
118 struct reg_window32 r_w
;
121 __asm__
__volatile__ ("flushw");
122 rw
= compat_ptr((unsigned)regs
->u_regs
[14]);
125 if (copy_from_user (&r_w
, rw
, sizeof(r_w
))) {
131 printk("l0: %08x l1: %08x l2: %08x l3: %08x "
132 "l4: %08x l5: %08x l6: %08x l7: %08x\n",
133 r_w
.locals
[0], r_w
.locals
[1], r_w
.locals
[2], r_w
.locals
[3],
134 r_w
.locals
[4], r_w
.locals
[5], r_w
.locals
[6], r_w
.locals
[7]);
135 printk("i0: %08x i1: %08x i2: %08x i3: %08x "
136 "i4: %08x i5: %08x i6: %08x i7: %08x\n",
137 r_w
.ins
[0], r_w
.ins
[1], r_w
.ins
[2], r_w
.ins
[3],
138 r_w
.ins
[4], r_w
.ins
[5], r_w
.ins
[6], r_w
.ins
[7]);
141 #define show_regwindow32(regs) do { } while (0)
144 static void show_regwindow(struct pt_regs
*regs
)
146 struct reg_window __user
*rw
;
147 struct reg_window
*rwk
;
148 struct reg_window r_w
;
151 if ((regs
->tstate
& TSTATE_PRIV
) || !(test_thread_flag(TIF_32BIT
))) {
152 __asm__
__volatile__ ("flushw");
153 rw
= (struct reg_window __user
*)
154 (regs
->u_regs
[14] + STACK_BIAS
);
155 rwk
= (struct reg_window
*)
156 (regs
->u_regs
[14] + STACK_BIAS
);
157 if (!(regs
->tstate
& TSTATE_PRIV
)) {
160 if (copy_from_user (&r_w
, rw
, sizeof(r_w
))) {
168 show_regwindow32(regs
);
171 printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
172 rwk
->locals
[0], rwk
->locals
[1], rwk
->locals
[2], rwk
->locals
[3]);
173 printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
174 rwk
->locals
[4], rwk
->locals
[5], rwk
->locals
[6], rwk
->locals
[7]);
175 printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
176 rwk
->ins
[0], rwk
->ins
[1], rwk
->ins
[2], rwk
->ins
[3]);
177 printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
178 rwk
->ins
[4], rwk
->ins
[5], rwk
->ins
[6], rwk
->ins
[7]);
179 if (regs
->tstate
& TSTATE_PRIV
)
180 printk("I7: <%pS>\n", (void *) rwk
->ins
[7]);
183 void show_regs(struct pt_regs
*regs
)
185 printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs
->tstate
,
186 regs
->tpc
, regs
->tnpc
, regs
->y
, print_tainted());
187 printk("TPC: <%pS>\n", (void *) regs
->tpc
);
188 printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
189 regs
->u_regs
[0], regs
->u_regs
[1], regs
->u_regs
[2],
191 printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
192 regs
->u_regs
[4], regs
->u_regs
[5], regs
->u_regs
[6],
194 printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
195 regs
->u_regs
[8], regs
->u_regs
[9], regs
->u_regs
[10],
197 printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
198 regs
->u_regs
[12], regs
->u_regs
[13], regs
->u_regs
[14],
200 printk("RPC: <%pS>\n", (void *) regs
->u_regs
[15]);
201 show_regwindow(regs
);
204 struct global_reg_snapshot global_reg_snapshot
[NR_CPUS
];
205 static DEFINE_SPINLOCK(global_reg_snapshot_lock
);
207 static void __global_reg_self(struct thread_info
*tp
, struct pt_regs
*regs
,
212 global_reg_snapshot
[this_cpu
].tstate
= regs
->tstate
;
213 global_reg_snapshot
[this_cpu
].tpc
= regs
->tpc
;
214 global_reg_snapshot
[this_cpu
].tnpc
= regs
->tnpc
;
215 global_reg_snapshot
[this_cpu
].o7
= regs
->u_regs
[UREG_I7
];
217 if (regs
->tstate
& TSTATE_PRIV
) {
218 struct reg_window
*rw
;
220 rw
= (struct reg_window
*)
221 (regs
->u_regs
[UREG_FP
] + STACK_BIAS
);
222 if (kstack_valid(tp
, (unsigned long) rw
)) {
223 global_reg_snapshot
[this_cpu
].i7
= rw
->ins
[7];
224 rw
= (struct reg_window
*)
225 (rw
->ins
[6] + STACK_BIAS
);
226 if (kstack_valid(tp
, (unsigned long) rw
))
227 global_reg_snapshot
[this_cpu
].rpc
= rw
->ins
[7];
230 global_reg_snapshot
[this_cpu
].i7
= 0;
231 global_reg_snapshot
[this_cpu
].rpc
= 0;
233 global_reg_snapshot
[this_cpu
].thread
= tp
;
236 /* In order to avoid hangs we do not try to synchronize with the
237 * global register dump client cpus. The last store they make is to
238 * the thread pointer, so do a short poll waiting for that to become
241 static void __global_reg_poll(struct global_reg_snapshot
*gp
)
245 while (!gp
->thread
&& ++limit
< 100) {
251 void __trigger_all_cpu_backtrace(void)
253 struct thread_info
*tp
= current_thread_info();
254 struct pt_regs
*regs
= get_irq_regs();
261 spin_lock_irqsave(&global_reg_snapshot_lock
, flags
);
263 memset(global_reg_snapshot
, 0, sizeof(global_reg_snapshot
));
265 this_cpu
= raw_smp_processor_id();
267 __global_reg_self(tp
, regs
, this_cpu
);
269 smp_fetch_global_regs();
271 for_each_online_cpu(cpu
) {
272 struct global_reg_snapshot
*gp
= &global_reg_snapshot
[cpu
];
274 __global_reg_poll(gp
);
277 printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
278 (cpu
== this_cpu
? '*' : ' '), cpu
,
279 gp
->tstate
, gp
->tpc
, gp
->tnpc
,
280 ((tp
&& tp
->task
) ? tp
->task
->comm
: "NULL"),
281 ((tp
&& tp
->task
) ? tp
->task
->pid
: -1));
283 if (gp
->tstate
& TSTATE_PRIV
) {
284 printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
290 printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
291 gp
->tpc
, gp
->o7
, gp
->i7
, gp
->rpc
);
295 memset(global_reg_snapshot
, 0, sizeof(global_reg_snapshot
));
297 spin_unlock_irqrestore(&global_reg_snapshot_lock
, flags
);
300 #ifdef CONFIG_MAGIC_SYSRQ
302 static void sysrq_handle_globreg(int key
, struct tty_struct
*tty
)
304 __trigger_all_cpu_backtrace();
307 static struct sysrq_key_op sparc_globalreg_op
= {
308 .handler
= sysrq_handle_globreg
,
309 .help_msg
= "Globalregs",
310 .action_msg
= "Show Global CPU Regs",
313 static int __init
sparc_globreg_init(void)
315 return register_sysrq_key('y', &sparc_globalreg_op
);
318 core_initcall(sparc_globreg_init
);
322 unsigned long thread_saved_pc(struct task_struct
*tsk
)
324 struct thread_info
*ti
= task_thread_info(tsk
);
325 unsigned long ret
= 0xdeadbeefUL
;
329 sp
= (unsigned long *)(ti
->ksp
+ STACK_BIAS
);
330 if (((unsigned long)sp
& (sizeof(long) - 1)) == 0UL &&
333 fp
= (unsigned long *)(sp
[14] + STACK_BIAS
);
334 if (((unsigned long)fp
& (sizeof(long) - 1)) == 0UL)
341 /* Free current thread data structures etc.. */
342 void exit_thread(void)
344 struct thread_info
*t
= current_thread_info();
347 if (t
->utraps
[0] < 2)
353 if (test_and_clear_thread_flag(TIF_PERFCTR
)) {
354 t
->user_cntd0
= t
->user_cntd1
= NULL
;
360 void flush_thread(void)
362 struct thread_info
*t
= current_thread_info();
363 struct mm_struct
*mm
;
365 if (test_ti_thread_flag(t
, TIF_ABI_PENDING
)) {
366 clear_ti_thread_flag(t
, TIF_ABI_PENDING
);
367 if (test_ti_thread_flag(t
, TIF_32BIT
))
368 clear_ti_thread_flag(t
, TIF_32BIT
);
370 set_ti_thread_flag(t
, TIF_32BIT
);
375 tsb_context_switch(mm
);
377 set_thread_wsaved(0);
379 /* Turn off performance counters if on. */
380 if (test_and_clear_thread_flag(TIF_PERFCTR
)) {
381 t
->user_cntd0
= t
->user_cntd1
= NULL
;
386 /* Clear FPU register state. */
389 if (get_thread_current_ds() != ASI_AIUS
)
393 /* It's a bit more tricky when 64-bit tasks are involved... */
394 static unsigned long clone_stackframe(unsigned long csp
, unsigned long psp
)
396 unsigned long fp
, distance
, rval
;
398 if (!(test_thread_flag(TIF_32BIT
))) {
401 __get_user(fp
, &(((struct reg_window __user
*)psp
)->ins
[6]));
404 __get_user(fp
, &(((struct reg_window32 __user
*)psp
)->ins
[6]));
406 /* Now 8-byte align the stack as this is mandatory in the
407 * Sparc ABI due to how register windows work. This hides
408 * the restriction from thread libraries etc. -DaveM
413 rval
= (csp
- distance
);
414 if (copy_in_user((void __user
*) rval
, (void __user
*) psp
, distance
))
416 else if (test_thread_flag(TIF_32BIT
)) {
417 if (put_user(((u32
)csp
),
418 &(((struct reg_window32 __user
*)rval
)->ins
[6])))
421 if (put_user(((u64
)csp
- STACK_BIAS
),
422 &(((struct reg_window __user
*)rval
)->ins
[6])))
425 rval
= rval
- STACK_BIAS
;
431 /* Standard stuff. */
432 static inline void shift_window_buffer(int first_win
, int last_win
,
433 struct thread_info
*t
)
437 for (i
= first_win
; i
< last_win
; i
++) {
438 t
->rwbuf_stkptrs
[i
] = t
->rwbuf_stkptrs
[i
+1];
439 memcpy(&t
->reg_window
[i
], &t
->reg_window
[i
+1],
440 sizeof(struct reg_window
));
444 void synchronize_user_stack(void)
446 struct thread_info
*t
= current_thread_info();
447 unsigned long window
;
449 flush_user_windows();
450 if ((window
= get_thread_wsaved()) != 0) {
451 int winsize
= sizeof(struct reg_window
);
454 if (test_thread_flag(TIF_32BIT
))
455 winsize
= sizeof(struct reg_window32
);
461 unsigned long sp
= (t
->rwbuf_stkptrs
[window
] + bias
);
462 struct reg_window
*rwin
= &t
->reg_window
[window
];
464 if (!copy_to_user((char __user
*)sp
, rwin
, winsize
)) {
465 shift_window_buffer(window
, get_thread_wsaved() - 1, t
);
466 set_thread_wsaved(get_thread_wsaved() - 1);
472 static void stack_unaligned(unsigned long sp
)
476 info
.si_signo
= SIGBUS
;
478 info
.si_code
= BUS_ADRALN
;
479 info
.si_addr
= (void __user
*) sp
;
481 force_sig_info(SIGBUS
, &info
, current
);
484 void fault_in_user_windows(void)
486 struct thread_info
*t
= current_thread_info();
487 unsigned long window
;
488 int winsize
= sizeof(struct reg_window
);
491 if (test_thread_flag(TIF_32BIT
))
492 winsize
= sizeof(struct reg_window32
);
496 flush_user_windows();
497 window
= get_thread_wsaved();
499 if (likely(window
!= 0)) {
502 unsigned long sp
= (t
->rwbuf_stkptrs
[window
] + bias
);
503 struct reg_window
*rwin
= &t
->reg_window
[window
];
505 if (unlikely(sp
& 0x7UL
))
508 if (unlikely(copy_to_user((char __user
*)sp
,
513 set_thread_wsaved(0);
517 set_thread_wsaved(window
+ 1);
521 asmlinkage
long sparc_do_fork(unsigned long clone_flags
,
522 unsigned long stack_start
,
523 struct pt_regs
*regs
,
524 unsigned long stack_size
)
526 int __user
*parent_tid_ptr
, *child_tid_ptr
;
527 unsigned long orig_i1
= regs
->u_regs
[UREG_I1
];
531 if (test_thread_flag(TIF_32BIT
)) {
532 parent_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I2
]);
533 child_tid_ptr
= compat_ptr(regs
->u_regs
[UREG_I4
]);
537 parent_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I2
];
538 child_tid_ptr
= (int __user
*) regs
->u_regs
[UREG_I4
];
541 ret
= do_fork(clone_flags
, stack_start
,
543 parent_tid_ptr
, child_tid_ptr
);
545 /* If we get an error and potentially restart the system
546 * call, we're screwed because copy_thread() clobbered
547 * the parent's %o1. So detect that case and restore it
550 if ((unsigned long)ret
>= -ERESTART_RESTARTBLOCK
)
551 regs
->u_regs
[UREG_I1
] = orig_i1
;
556 /* Copy a Sparc thread. The fork() return value conventions
557 * under SunOS are nothing short of bletcherous:
558 * Parent --> %o0 == childs pid, %o1 == 0
559 * Child --> %o0 == parents pid, %o1 == 1
561 int copy_thread(int nr
, unsigned long clone_flags
, unsigned long sp
,
562 unsigned long unused
,
563 struct task_struct
*p
, struct pt_regs
*regs
)
565 struct thread_info
*t
= task_thread_info(p
);
566 struct sparc_stackf
*parent_sf
;
567 unsigned long child_stack_sz
;
568 char *child_trap_frame
;
571 kernel_thread
= (regs
->tstate
& TSTATE_PRIV
) ? 1 : 0;
572 parent_sf
= ((struct sparc_stackf
*) regs
) - 1;
574 /* Calculate offset to stack_frame & pt_regs */
575 child_stack_sz
= ((STACKFRAME_SZ
+ TRACEREG_SZ
) +
576 (kernel_thread
? STACKFRAME_SZ
: 0));
577 child_trap_frame
= (task_stack_page(p
) +
578 (THREAD_SIZE
- child_stack_sz
));
579 memcpy(child_trap_frame
, parent_sf
, child_stack_sz
);
581 t
->flags
= (t
->flags
& ~((0xffUL
<< TI_FLAG_CWP_SHIFT
) |
582 (0xffUL
<< TI_FLAG_CURRENT_DS_SHIFT
))) |
583 (((regs
->tstate
+ 1) & TSTATE_CWP
) << TI_FLAG_CWP_SHIFT
);
585 t
->ksp
= ((unsigned long) child_trap_frame
) - STACK_BIAS
;
586 t
->kregs
= (struct pt_regs
*) (child_trap_frame
+
587 sizeof(struct sparc_stackf
));
591 struct sparc_stackf
*child_sf
= (struct sparc_stackf
*)
592 (child_trap_frame
+ (STACKFRAME_SZ
+ TRACEREG_SZ
));
594 /* Zero terminate the stack backtrace. */
596 t
->kregs
->u_regs
[UREG_FP
] =
597 ((unsigned long) child_sf
) - STACK_BIAS
;
599 /* Special case, if we are spawning a kernel thread from
600 * a userspace task (usermode helper, NFS or similar), we
601 * must disable performance counters in the child because
602 * the address space and protection realm are changing.
604 if (t
->flags
& _TIF_PERFCTR
) {
605 t
->user_cntd0
= t
->user_cntd1
= NULL
;
607 t
->flags
&= ~_TIF_PERFCTR
;
609 t
->flags
|= ((long)ASI_P
<< TI_FLAG_CURRENT_DS_SHIFT
);
610 t
->kregs
->u_regs
[UREG_G6
] = (unsigned long) t
;
611 t
->kregs
->u_regs
[UREG_G4
] = (unsigned long) t
->task
;
613 if (t
->flags
& _TIF_32BIT
) {
614 sp
&= 0x00000000ffffffffUL
;
615 regs
->u_regs
[UREG_FP
] &= 0x00000000ffffffffUL
;
617 t
->kregs
->u_regs
[UREG_FP
] = sp
;
618 t
->flags
|= ((long)ASI_AIUS
<< TI_FLAG_CURRENT_DS_SHIFT
);
619 if (sp
!= regs
->u_regs
[UREG_FP
]) {
622 csp
= clone_stackframe(sp
, regs
->u_regs
[UREG_FP
]);
625 t
->kregs
->u_regs
[UREG_FP
] = csp
;
631 /* Set the return value for the child. */
632 t
->kregs
->u_regs
[UREG_I0
] = current
->pid
;
633 t
->kregs
->u_regs
[UREG_I1
] = 1;
635 /* Set the second return value for the parent. */
636 regs
->u_regs
[UREG_I1
] = 0;
638 if (clone_flags
& CLONE_SETTLS
)
639 t
->kregs
->u_regs
[UREG_G7
] = regs
->u_regs
[UREG_I3
];
645 * This is the mechanism for creating a new kernel thread.
647 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
648 * who haven't done an "execve()") should use this: it will work within
649 * a system call from a "real" process, but the process memory space will
650 * not be freed until both the parent and the child have exited.
652 pid_t
kernel_thread(int (*fn
)(void *), void * arg
, unsigned long flags
)
656 /* If the parent runs before fn(arg) is called by the child,
657 * the input registers of this function can be clobbered.
658 * So we stash 'fn' and 'arg' into global registers which
659 * will not be modified by the parent.
661 __asm__
__volatile__("mov %4, %%g2\n\t" /* Save FN into global */
662 "mov %5, %%g3\n\t" /* Save ARG into global */
663 "mov %1, %%g1\n\t" /* Clone syscall nr. */
664 "mov %2, %%o0\n\t" /* Clone flags. */
665 "mov 0, %%o1\n\t" /* usp arg == 0 */
666 "t 0x6d\n\t" /* Linux/Sparc clone(). */
667 "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
669 "jmpl %%g2, %%o7\n\t" /* Call the function. */
670 " mov %%g3, %%o0\n\t" /* Set arg in delay. */
672 "t 0x6d\n\t" /* Linux/Sparc exit(). */
673 /* Notreached by child. */
676 "i" (__NR_clone
), "r" (flags
| CLONE_VM
| CLONE_UNTRACED
),
677 "i" (__NR_exit
), "r" (fn
), "r" (arg
) :
678 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
684 unsigned int pr_regs
[32];
685 unsigned long pr_dregs
[16];
687 unsigned int __unused
;
689 unsigned char pr_qcnt
;
690 unsigned char pr_q_entrysize
;
692 unsigned int pr_q
[64];
696 * fill in the fpu structure for a core dump.
698 int dump_fpu (struct pt_regs
* regs
, elf_fpregset_t
* fpregs
)
700 unsigned long *kfpregs
= current_thread_info()->fpregs
;
701 unsigned long fprs
= current_thread_info()->fpsaved
[0];
703 if (test_thread_flag(TIF_32BIT
)) {
704 elf_fpregset_t32
*fpregs32
= (elf_fpregset_t32
*)fpregs
;
707 memcpy(&fpregs32
->pr_fr
.pr_regs
[0], kfpregs
,
708 sizeof(unsigned int) * 32);
710 memset(&fpregs32
->pr_fr
.pr_regs
[0], 0,
711 sizeof(unsigned int) * 32);
712 fpregs32
->pr_qcnt
= 0;
713 fpregs32
->pr_q_entrysize
= 8;
714 memset(&fpregs32
->pr_q
[0], 0,
715 (sizeof(unsigned int) * 64));
716 if (fprs
& FPRS_FEF
) {
717 fpregs32
->pr_fsr
= (unsigned int) current_thread_info()->xfsr
[0];
720 fpregs32
->pr_fsr
= 0;
725 memcpy(&fpregs
->pr_regs
[0], kfpregs
,
726 sizeof(unsigned int) * 32);
728 memset(&fpregs
->pr_regs
[0], 0,
729 sizeof(unsigned int) * 32);
731 memcpy(&fpregs
->pr_regs
[16], kfpregs
+16,
732 sizeof(unsigned int) * 32);
734 memset(&fpregs
->pr_regs
[16], 0,
735 sizeof(unsigned int) * 32);
736 if(fprs
& FPRS_FEF
) {
737 fpregs
->pr_fsr
= current_thread_info()->xfsr
[0];
738 fpregs
->pr_gsr
= current_thread_info()->gsr
[0];
740 fpregs
->pr_fsr
= fpregs
->pr_gsr
= 0;
742 fpregs
->pr_fprs
= fprs
;
748 * sparc_execve() executes a new program after the asm stub has set
749 * things up for us. This should basically do what I want it to.
751 asmlinkage
int sparc_execve(struct pt_regs
*regs
)
756 /* User register window flush is done by entry.S */
758 /* Check for indirect call. */
759 if (regs
->u_regs
[UREG_G1
] == 0)
762 filename
= getname((char __user
*)regs
->u_regs
[base
+ UREG_I0
]);
763 error
= PTR_ERR(filename
);
764 if (IS_ERR(filename
))
766 error
= do_execve(filename
,
767 (char __user
* __user
*)
768 regs
->u_regs
[base
+ UREG_I1
],
769 (char __user
* __user
*)
770 regs
->u_regs
[base
+ UREG_I2
], regs
);
774 current_thread_info()->xfsr
[0] = 0;
775 current_thread_info()->fpsaved
[0] = 0;
776 regs
->tstate
&= ~TSTATE_PEF
;
782 unsigned long get_wchan(struct task_struct
*task
)
784 unsigned long pc
, fp
, bias
= 0;
785 struct thread_info
*tp
;
786 struct reg_window
*rw
;
787 unsigned long ret
= 0;
790 if (!task
|| task
== current
||
791 task
->state
== TASK_RUNNING
)
794 tp
= task_thread_info(task
);
796 fp
= task_thread_info(task
)->ksp
+ bias
;
799 if (!kstack_valid(tp
, fp
))
801 rw
= (struct reg_window
*) fp
;
803 if (!in_sched_functions(pc
)) {
807 fp
= rw
->ins
[6] + bias
;
808 } while (++count
< 16);