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Commit | Line | Data |
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64d329ee | 1 | /* linux/arch/sparc/kernel/process.c |
1da177e4 | 2 | * |
4fe3ebec | 3 | * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
4 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) |
5 | */ | |
6 | ||
7 | /* | |
8 | * This file handles the architecture-dependent parts of process handling.. | |
9 | */ | |
10 | ||
11 | #include <stdarg.h> | |
12 | ||
8bdd5a1b | 13 | #include <linux/elfcore.h> |
1da177e4 LT |
14 | #include <linux/errno.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/sched.h> | |
b17b0153 | 17 | #include <linux/sched/debug.h> |
29930025 | 18 | #include <linux/sched/task.h> |
1da177e4 | 19 | #include <linux/kernel.h> |
1da177e4 LT |
20 | #include <linux/mm.h> |
21 | #include <linux/stddef.h> | |
22 | #include <linux/ptrace.h> | |
1da177e4 | 23 | #include <linux/user.h> |
1da177e4 | 24 | #include <linux/smp.h> |
1da177e4 LT |
25 | #include <linux/reboot.h> |
26 | #include <linux/delay.h> | |
27 | #include <linux/pm.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
8bdd5a1b | 29 | #include <linux/cpu.h> |
1da177e4 LT |
30 | |
31 | #include <asm/auxio.h> | |
32 | #include <asm/oplib.h> | |
7c0f6ba6 | 33 | #include <linux/uaccess.h> |
1da177e4 LT |
34 | #include <asm/page.h> |
35 | #include <asm/pgalloc.h> | |
36 | #include <asm/pgtable.h> | |
37 | #include <asm/delay.h> | |
38 | #include <asm/processor.h> | |
39 | #include <asm/psr.h> | |
40 | #include <asm/elf.h> | |
c73fcc84 | 41 | #include <asm/prom.h> |
1da177e4 | 42 | #include <asm/unistd.h> |
d550bbd4 | 43 | #include <asm/setup.h> |
1da177e4 | 44 | |
8bdd5a1b SR |
45 | #include "kernel.h" |
46 | ||
1da177e4 LT |
47 | /* |
48 | * Power management idle function | |
49 | * Set in pm platform drivers (apc.c and pmc.c) | |
50 | */ | |
d472ba84 | 51 | void (*sparc_idle)(void); |
1da177e4 LT |
52 | |
53 | /* | |
54 | * Power-off handler instantiation for pm.h compliance | |
55 | * This is done via auxio, but could be used as a fallback | |
56 | * handler when auxio is not present-- unused for now... | |
57 | */ | |
304cd3ef | 58 | void (*pm_power_off)(void) = machine_power_off; |
89eb1693 | 59 | EXPORT_SYMBOL(pm_power_off); |
1da177e4 LT |
60 | |
61 | /* | |
62 | * sysctl - toggle power-off restriction for serial console | |
63 | * systems in machine_power_off() | |
64 | */ | |
65 | int scons_pwroff = 1; | |
66 | ||
67 | extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *); | |
68 | ||
69 | struct task_struct *last_task_used_math = NULL; | |
70 | struct thread_info *current_set[NR_CPUS]; | |
71 | ||
87fa05ae SR |
72 | /* Idle loop support. */ |
73 | void arch_cpu_idle(void) | |
1da177e4 | 74 | { |
87fa05ae SR |
75 | if (sparc_idle) |
76 | (*sparc_idle)(); | |
77 | local_irq_enable(); | |
1da177e4 LT |
78 | } |
79 | ||
1da177e4 LT |
80 | /* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */ |
81 | void machine_halt(void) | |
82 | { | |
83 | local_irq_enable(); | |
84 | mdelay(8); | |
85 | local_irq_disable(); | |
1da177e4 LT |
86 | prom_halt(); |
87 | panic("Halt failed!"); | |
88 | } | |
89 | ||
1da177e4 LT |
90 | void machine_restart(char * cmd) |
91 | { | |
92 | char *p; | |
93 | ||
94 | local_irq_enable(); | |
95 | mdelay(8); | |
96 | local_irq_disable(); | |
97 | ||
98 | p = strchr (reboot_command, '\n'); | |
99 | if (p) *p = 0; | |
1da177e4 LT |
100 | if (cmd) |
101 | prom_reboot(cmd); | |
102 | if (*reboot_command) | |
103 | prom_reboot(reboot_command); | |
104 | prom_feval ("reset"); | |
105 | panic("Reboot failed!"); | |
106 | } | |
107 | ||
1da177e4 LT |
108 | void machine_power_off(void) |
109 | { | |
c73fcc84 | 110 | if (auxio_power_register && |
d2aca8f9 SR |
111 | (strcmp(of_console_device->type, "serial") || scons_pwroff)) { |
112 | u8 power_register = sbus_readb(auxio_power_register); | |
113 | power_register |= AUXIO_POWER_OFF; | |
114 | sbus_writeb(power_register, auxio_power_register); | |
115 | } | |
116 | ||
1da177e4 LT |
117 | machine_halt(); |
118 | } | |
119 | ||
1da177e4 LT |
120 | void show_regs(struct pt_regs *r) |
121 | { | |
4d7b92ad | 122 | struct reg_window32 *rw = (struct reg_window32 *) r->u_regs[14]; |
1da177e4 | 123 | |
a43cb95d TH |
124 | show_regs_print_info(KERN_DEFAULT); |
125 | ||
1da177e4 LT |
126 | printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx %s\n", |
127 | r->psr, r->pc, r->npc, r->y, print_tainted()); | |
4fe3ebec | 128 | printk("PC: <%pS>\n", (void *) r->pc); |
1da177e4 LT |
129 | printk("%%G: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", |
130 | r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3], | |
131 | r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]); | |
132 | printk("%%O: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
133 | r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11], | |
134 | r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]); | |
4fe3ebec | 135 | printk("RPC: <%pS>\n", (void *) r->u_regs[15]); |
1da177e4 LT |
136 | |
137 | printk("%%L: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
138 | rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3], | |
139 | rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]); | |
140 | printk("%%I: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", | |
141 | rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3], | |
142 | rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]); | |
143 | } | |
144 | ||
145 | /* | |
146 | * The show_stack is an external API which we do not use ourselves. | |
147 | * The oops is printed in die_if_kernel. | |
148 | */ | |
149 | void show_stack(struct task_struct *tsk, unsigned long *_ksp) | |
150 | { | |
151 | unsigned long pc, fp; | |
152 | unsigned long task_base; | |
4d7b92ad | 153 | struct reg_window32 *rw; |
1da177e4 LT |
154 | int count = 0; |
155 | ||
89e3f23d TH |
156 | if (!tsk) |
157 | tsk = current; | |
1da177e4 | 158 | |
89e3f23d TH |
159 | if (tsk == current && !_ksp) |
160 | __asm__ __volatile__("mov %%fp, %0" : "=r" (_ksp)); | |
161 | ||
162 | task_base = (unsigned long) task_stack_page(tsk); | |
1da177e4 LT |
163 | fp = (unsigned long) _ksp; |
164 | do { | |
165 | /* Bogus frame pointer? */ | |
166 | if (fp < (task_base + sizeof(struct thread_info)) || | |
167 | fp >= (task_base + (PAGE_SIZE << 1))) | |
168 | break; | |
4d7b92ad | 169 | rw = (struct reg_window32 *) fp; |
1da177e4 LT |
170 | pc = rw->ins[7]; |
171 | printk("[%08lx : ", pc); | |
4fe3ebec | 172 | printk("%pS ] ", (void *) pc); |
1da177e4 LT |
173 | fp = rw->ins[6]; |
174 | } while (++count < 16); | |
175 | printk("\n"); | |
176 | } | |
177 | ||
178 | /* | |
179 | * Note: sparc64 has a pretty intricated thread_saved_pc, check it out. | |
180 | */ | |
181 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
182 | { | |
d562ef6a | 183 | return task_thread_info(tsk)->kpc; |
1da177e4 LT |
184 | } |
185 | ||
186 | /* | |
187 | * Free current thread data structures etc.. | |
188 | */ | |
e6464694 | 189 | void exit_thread(struct task_struct *tsk) |
1da177e4 LT |
190 | { |
191 | #ifndef CONFIG_SMP | |
e6464694 | 192 | if (last_task_used_math == tsk) { |
1da177e4 | 193 | #else |
e6464694 | 194 | if (test_ti_thread_flag(task_thread_info(tsk), TIF_USEDFPU)) { |
1da177e4 LT |
195 | #endif |
196 | /* Keep process from leaving FPU in a bogon state. */ | |
197 | put_psr(get_psr() | PSR_EF); | |
e6464694 JS |
198 | fpsave(&tsk->thread.float_regs[0], &tsk->thread.fsr, |
199 | &tsk->thread.fpqueue[0], &tsk->thread.fpqdepth); | |
1da177e4 LT |
200 | #ifndef CONFIG_SMP |
201 | last_task_used_math = NULL; | |
202 | #else | |
e6464694 | 203 | clear_ti_thread_flag(task_thread_info(tsk), TIF_USEDFPU); |
1da177e4 LT |
204 | #endif |
205 | } | |
206 | } | |
207 | ||
208 | void flush_thread(void) | |
209 | { | |
210 | current_thread_info()->w_saved = 0; | |
211 | ||
1da177e4 LT |
212 | #ifndef CONFIG_SMP |
213 | if(last_task_used_math == current) { | |
214 | #else | |
54f565ea | 215 | if (test_thread_flag(TIF_USEDFPU)) { |
1da177e4 LT |
216 | #endif |
217 | /* Clean the fpu. */ | |
218 | put_psr(get_psr() | PSR_EF); | |
219 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
220 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
221 | #ifndef CONFIG_SMP | |
222 | last_task_used_math = NULL; | |
223 | #else | |
54f565ea | 224 | clear_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
225 | #endif |
226 | } | |
227 | ||
ddd53bf1 | 228 | /* This task is no longer a kernel thread. */ |
1da177e4 LT |
229 | if (current->thread.flags & SPARC_FLAG_KTHREAD) { |
230 | current->thread.flags &= ~SPARC_FLAG_KTHREAD; | |
231 | ||
232 | /* We must fixup kregs as well. */ | |
233 | /* XXX This was not fixed for ti for a while, worked. Unused? */ | |
234 | current->thread.kregs = (struct pt_regs *) | |
36483c6b | 235 | (task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ)); |
1da177e4 LT |
236 | } |
237 | } | |
238 | ||
64d329ee | 239 | static inline struct sparc_stackf __user * |
1da177e4 LT |
240 | clone_stackframe(struct sparc_stackf __user *dst, |
241 | struct sparc_stackf __user *src) | |
242 | { | |
243 | unsigned long size, fp; | |
244 | struct sparc_stackf *tmp; | |
245 | struct sparc_stackf __user *sp; | |
246 | ||
247 | if (get_user(tmp, &src->fp)) | |
248 | return NULL; | |
249 | ||
250 | fp = (unsigned long) tmp; | |
251 | size = (fp - ((unsigned long) src)); | |
252 | fp = (unsigned long) dst; | |
253 | sp = (struct sparc_stackf __user *)(fp - size); | |
254 | ||
255 | /* do_fork() grabs the parent semaphore, we must release it | |
256 | * temporarily so we can build the child clone stack frame | |
257 | * without deadlocking. | |
258 | */ | |
259 | if (__copy_user(sp, src, size)) | |
260 | sp = NULL; | |
261 | else if (put_user(fp, &sp->fp)) | |
262 | sp = NULL; | |
263 | ||
264 | return sp; | |
265 | } | |
266 | ||
267 | asmlinkage int sparc_do_fork(unsigned long clone_flags, | |
268 | unsigned long stack_start, | |
269 | struct pt_regs *regs, | |
270 | unsigned long stack_size) | |
271 | { | |
272 | unsigned long parent_tid_ptr, child_tid_ptr; | |
1e38c126 DM |
273 | unsigned long orig_i1 = regs->u_regs[UREG_I1]; |
274 | long ret; | |
1da177e4 LT |
275 | |
276 | parent_tid_ptr = regs->u_regs[UREG_I2]; | |
277 | child_tid_ptr = regs->u_regs[UREG_I4]; | |
278 | ||
e80d6661 | 279 | ret = do_fork(clone_flags, stack_start, stack_size, |
1e38c126 DM |
280 | (int __user *) parent_tid_ptr, |
281 | (int __user *) child_tid_ptr); | |
282 | ||
283 | /* If we get an error and potentially restart the system | |
284 | * call, we're screwed because copy_thread() clobbered | |
285 | * the parent's %o1. So detect that case and restore it | |
286 | * here. | |
287 | */ | |
288 | if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) | |
289 | regs->u_regs[UREG_I1] = orig_i1; | |
290 | ||
291 | return ret; | |
1da177e4 LT |
292 | } |
293 | ||
294 | /* Copy a Sparc thread. The fork() return value conventions | |
295 | * under SunOS are nothing short of bletcherous: | |
296 | * Parent --> %o0 == childs pid, %o1 == 0 | |
297 | * Child --> %o0 == parents pid, %o1 == 1 | |
298 | * | |
299 | * NOTE: We have a separate fork kpsr/kwim because | |
300 | * the parent could change these values between | |
301 | * sys_fork invocation and when we reach here | |
302 | * if the parent should sleep while trying to | |
303 | * allocate the task_struct and kernel stack in | |
304 | * do_fork(). | |
305 | * XXX See comment above sys_vfork in sparc64. todo. | |
306 | */ | |
307 | extern void ret_from_fork(void); | |
c78e0643 | 308 | extern void ret_from_kernel_thread(void); |
1da177e4 | 309 | |
6f2c55b8 | 310 | int copy_thread(unsigned long clone_flags, unsigned long sp, |
afa86fc4 | 311 | unsigned long arg, struct task_struct *p) |
1da177e4 | 312 | { |
36483c6b | 313 | struct thread_info *ti = task_thread_info(p); |
afa86fc4 | 314 | struct pt_regs *childregs, *regs = current_pt_regs(); |
1da177e4 LT |
315 | char *new_stack; |
316 | ||
317 | #ifndef CONFIG_SMP | |
318 | if(last_task_used_math == current) { | |
319 | #else | |
54f565ea | 320 | if (test_thread_flag(TIF_USEDFPU)) { |
1da177e4 LT |
321 | #endif |
322 | put_psr(get_psr() | PSR_EF); | |
323 | fpsave(&p->thread.float_regs[0], &p->thread.fsr, | |
324 | &p->thread.fpqueue[0], &p->thread.fpqdepth); | |
1da177e4 LT |
325 | } |
326 | ||
327 | /* | |
c78e0643 AV |
328 | * p->thread_info new_stack childregs stack bottom |
329 | * ! ! ! ! | |
330 | * V V (stk.fr.) V (pt_regs) V | |
331 | * +----- - - - - - ------+===========+=============+ | |
1da177e4 | 332 | */ |
36483c6b | 333 | new_stack = task_stack_page(p) + THREAD_SIZE; |
1da177e4 | 334 | new_stack -= STACKFRAME_SZ + TRACEREG_SZ; |
1da177e4 LT |
335 | childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ); |
336 | ||
337 | /* | |
bef033a3 IM |
338 | * A new process must start with interrupts disabled, see schedule_tail() |
339 | * and finish_task_switch(). (If we do not do it and if a timer interrupt | |
340 | * hits before we unlock and attempts to take the rq->lock, we deadlock.) | |
341 | * | |
342 | * Thus, kpsr |= PSR_PIL. | |
1da177e4 LT |
343 | */ |
344 | ti->ksp = (unsigned long) new_stack; | |
c78e0643 AV |
345 | p->thread.kregs = childregs; |
346 | ||
347 | if (unlikely(p->flags & PF_KTHREAD)) { | |
348 | extern int nwindows; | |
349 | unsigned long psr; | |
350 | memset(new_stack, 0, STACKFRAME_SZ + TRACEREG_SZ); | |
351 | p->thread.flags |= SPARC_FLAG_KTHREAD; | |
352 | p->thread.current_ds = KERNEL_DS; | |
353 | ti->kpc = (((unsigned long) ret_from_kernel_thread) - 0x8); | |
354 | childregs->u_regs[UREG_G1] = sp; /* function */ | |
355 | childregs->u_regs[UREG_G2] = arg; | |
356 | psr = childregs->psr = get_psr(); | |
357 | ti->kpsr = psr | PSR_PIL; | |
358 | ti->kwim = 1 << (((psr & PSR_CWP) + 1) % nwindows); | |
359 | return 0; | |
360 | } | |
361 | memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ); | |
362 | childregs->u_regs[UREG_FP] = sp; | |
363 | p->thread.flags &= ~SPARC_FLAG_KTHREAD; | |
364 | p->thread.current_ds = USER_DS; | |
1da177e4 LT |
365 | ti->kpc = (((unsigned long) ret_from_fork) - 0x8); |
366 | ti->kpsr = current->thread.fork_kpsr | PSR_PIL; | |
367 | ti->kwim = current->thread.fork_kwim; | |
368 | ||
c78e0643 AV |
369 | if (sp != regs->u_regs[UREG_FP]) { |
370 | struct sparc_stackf __user *childstack; | |
371 | struct sparc_stackf __user *parentstack; | |
1da177e4 | 372 | |
c78e0643 AV |
373 | /* |
374 | * This is a clone() call with supplied user stack. | |
375 | * Set some valid stack frames to give to the child. | |
376 | */ | |
377 | childstack = (struct sparc_stackf __user *) | |
378 | (sp & ~0xfUL); | |
379 | parentstack = (struct sparc_stackf __user *) | |
380 | regs->u_regs[UREG_FP]; | |
1da177e4 LT |
381 | |
382 | #if 0 | |
c78e0643 AV |
383 | printk("clone: parent stack:\n"); |
384 | show_stackframe(parentstack); | |
1da177e4 LT |
385 | #endif |
386 | ||
c78e0643 AV |
387 | childstack = clone_stackframe(childstack, parentstack); |
388 | if (!childstack) | |
389 | return -EFAULT; | |
1da177e4 LT |
390 | |
391 | #if 0 | |
c78e0643 AV |
392 | printk("clone: child stack:\n"); |
393 | show_stackframe(childstack); | |
1da177e4 LT |
394 | #endif |
395 | ||
c78e0643 | 396 | childregs->u_regs[UREG_FP] = (unsigned long)childstack; |
1da177e4 LT |
397 | } |
398 | ||
399 | #ifdef CONFIG_SMP | |
400 | /* FPU must be disabled on SMP. */ | |
401 | childregs->psr &= ~PSR_EF; | |
427f23cb | 402 | clear_tsk_thread_flag(p, TIF_USEDFPU); |
1da177e4 LT |
403 | #endif |
404 | ||
405 | /* Set the return value for the child. */ | |
406 | childregs->u_regs[UREG_I0] = current->pid; | |
407 | childregs->u_regs[UREG_I1] = 1; | |
408 | ||
409 | /* Set the return value for the parent. */ | |
410 | regs->u_regs[UREG_I1] = 0; | |
411 | ||
412 | if (clone_flags & CLONE_SETTLS) | |
413 | childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; | |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
1da177e4 LT |
418 | /* |
419 | * fill in the fpu structure for a core dump. | |
420 | */ | |
421 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) | |
422 | { | |
423 | if (used_math()) { | |
424 | memset(fpregs, 0, sizeof(*fpregs)); | |
425 | fpregs->pr_q_entrysize = 8; | |
426 | return 1; | |
427 | } | |
428 | #ifdef CONFIG_SMP | |
54f565ea | 429 | if (test_thread_flag(TIF_USEDFPU)) { |
1da177e4 LT |
430 | put_psr(get_psr() | PSR_EF); |
431 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
432 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
433 | if (regs != NULL) { | |
434 | regs->psr &= ~(PSR_EF); | |
54f565ea | 435 | clear_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
436 | } |
437 | } | |
438 | #else | |
439 | if (current == last_task_used_math) { | |
440 | put_psr(get_psr() | PSR_EF); | |
441 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
442 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
443 | if (regs != NULL) { | |
444 | regs->psr &= ~(PSR_EF); | |
445 | last_task_used_math = NULL; | |
446 | } | |
447 | } | |
448 | #endif | |
449 | memcpy(&fpregs->pr_fr.pr_regs[0], | |
450 | ¤t->thread.float_regs[0], | |
451 | (sizeof(unsigned long) * 32)); | |
452 | fpregs->pr_fsr = current->thread.fsr; | |
453 | fpregs->pr_qcnt = current->thread.fpqdepth; | |
454 | fpregs->pr_q_entrysize = 8; | |
455 | fpregs->pr_en = 1; | |
456 | if(fpregs->pr_qcnt != 0) { | |
457 | memcpy(&fpregs->pr_q[0], | |
458 | ¤t->thread.fpqueue[0], | |
459 | sizeof(struct fpq) * fpregs->pr_qcnt); | |
460 | } | |
461 | /* Zero out the rest. */ | |
462 | memset(&fpregs->pr_q[fpregs->pr_qcnt], 0, | |
463 | sizeof(struct fpq) * (32 - fpregs->pr_qcnt)); | |
464 | return 1; | |
465 | } | |
466 | ||
1da177e4 LT |
467 | unsigned long get_wchan(struct task_struct *task) |
468 | { | |
469 | unsigned long pc, fp, bias = 0; | |
470 | unsigned long task_base = (unsigned long) task; | |
471 | unsigned long ret = 0; | |
4d7b92ad | 472 | struct reg_window32 *rw; |
1da177e4 LT |
473 | int count = 0; |
474 | ||
475 | if (!task || task == current || | |
476 | task->state == TASK_RUNNING) | |
477 | goto out; | |
478 | ||
d562ef6a | 479 | fp = task_thread_info(task)->ksp + bias; |
1da177e4 LT |
480 | do { |
481 | /* Bogus frame pointer? */ | |
482 | if (fp < (task_base + sizeof(struct thread_info)) || | |
483 | fp >= (task_base + (2 * PAGE_SIZE))) | |
484 | break; | |
4d7b92ad | 485 | rw = (struct reg_window32 *) fp; |
1da177e4 LT |
486 | pc = rw->ins[7]; |
487 | if (!in_sched_functions(pc)) { | |
488 | ret = pc; | |
489 | goto out; | |
490 | } | |
491 | fp = rw->ins[6] + bias; | |
492 | } while (++count < 16); | |
493 | ||
494 | out: | |
495 | return ret; | |
496 | } | |
497 |