text: // SPDX-License-Identifier: GPL-2.0
  /*  arch/sparc64/kernel/process.c
   *
   *  Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net)
   *  Copyright (C) 1996       Eddie C. Dost   (ecd@skynet.be)
   *  Copyright (C) 1997, 1998 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
   */
  
  /*
   * This file handles the architecture-dependent parts of process handling..
   */
  #include <linux/errno.h>
  #include <linux/export.h>
  #include <linux/sched.h>
  #include <linux/sched/debug.h>
  #include <linux/sched/task.h>
  #include <linux/sched/task_stack.h>
  #include <linux/kernel.h>
  #include <linux/mm.h>
  #include <linux/fs.h>
  #include <linux/smp.h>
  #include <linux/stddef.h>
  #include <linux/ptrace.h>
  #include <linux/slab.h>
  #include <linux/user.h>
  #include <linux/delay.h>
  #include <linux/compat.h>
  #include <linux/tick.h>
  #include <linux/init.h>
  #include <linux/cpu.h>
  #include <linux/perf_event.h>
  #include <linux/elfcore.h>
  #include <linux/sysrq.h>
  #include <linux/nmi.h>
  #include <linux/context_tracking.h>
  #include <linux/signal.h>
  
  #include <linux/uaccess.h>
  #include <asm/page.h>
  #include <asm/pgalloc.h>
  #include <asm/processor.h>
  #include <asm/pstate.h>
  #include <asm/elf.h>
  #include <asm/fpumacro.h>
  #include <asm/head.h>
  #include <asm/cpudata.h>
  #include <asm/mmu_context.h>
  #include <asm/unistd.h>
  #include <asm/hypervisor.h>
  #include <asm/syscalls.h>
  #include <asm/irq_regs.h>
  #include <asm/smp.h>
  #include <asm/pcr.h>
  
  #include "kstack.h"
  
  /* Idle loop support on sparc64. */
  void arch_cpu_idle(void)
  {
  	if (tlb_type != hypervisor) {
  		touch_nmi_watchdog();
  		raw_local_irq_enable();
  	} else {
  		unsigned long pstate;
  
  		raw_local_irq_enable();
  
                  /* The sun4v sleeping code requires that we have PSTATE.IE cleared over
                   * the cpu sleep hypervisor call.
                   */
  		__asm__ __volatile__(
  			"rdpr %%pstate, %0\n\t"
  			"andn %0, %1, %0\n\t"
  			"wrpr %0, %%g0, %%pstate"
  			: "=&r" (pstate)
  			: "i" (PSTATE_IE));
  
  		if (!need_resched() && !cpu_is_offline(smp_processor_id())) {
  			sun4v_cpu_yield();
  			/* If resumed by cpu_poke then we need to explicitly
  			 * call scheduler_ipi().
  			 */
  			scheduler_poke();
  		}
  
  		/* Re-enable interrupts. */
  		__asm__ __volatile__(
  			"rdpr %%pstate, %0\n\t"
  			"or %0, %1, %0\n\t"
  			"wrpr %0, %%g0, %%pstate"
  			: "=&r" (pstate)
  			: "i" (PSTATE_IE));
  	}
  }
  
  #ifdef CONFIG_HOTPLUG_CPU
  void arch_cpu_idle_dead(void)
  {
  	sched_preempt_enable_no_resched();
  	cpu_play_dead();
  }
  #endif
  
  #ifdef CONFIG_COMPAT
  static void show_regwindow32(struct pt_regs *regs)
  {
  	struct reg_window32 __user *rw;
  	struct reg_window32 r_w;
  	mm_segment_t old_fs;
  	
  	__asm__ __volatile__ ("flushw");
  	rw = compat_ptr((unsigned int)regs->u_regs[14]);
  	old_fs = get_fs();
  	set_fs (USER_DS);
  	if (copy_from_user (&r_w, rw, sizeof(r_w))) {
  		set_fs (old_fs);
  		return;
  	}
  
  	set_fs (old_fs);			
  	printk("l0: %08x l1: %08x l2: %08x l3: %08x "
  	       "l4: %08x l5: %08x l6: %08x l7: %08x\n",
  	       r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
  	       r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
  	printk("i0: %08x i1: %08x i2: %08x i3: %08x "
  	       "i4: %08x i5: %08x i6: %08x i7: %08x\n",
  	       r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
  	       r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
  }
  #else
  #define show_regwindow32(regs)	do { } while (0)
  #endif
  
  static void show_regwindow(struct pt_regs *regs)
  {
  	struct reg_window __user *rw;
  	struct reg_window *rwk;
  	struct reg_window r_w;
  	mm_segment_t old_fs;
  
  	if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
  		__asm__ __volatile__ ("flushw");
  		rw = (struct reg_window __user *)
  			(regs->u_regs[14] + STACK_BIAS);
  		rwk = (struct reg_window *)
  			(regs->u_regs[14] + STACK_BIAS);
  		if (!(regs->tstate & TSTATE_PRIV)) {
  			old_fs = get_fs();
  			set_fs (USER_DS);
  			if (copy_from_user (&r_w, rw, sizeof(r_w))) {
  				set_fs (old_fs);
  				return;
  			}
  			rwk = &r_w;
  			set_fs (old_fs);			
  		}
  	} else {
  		show_regwindow32(regs);
  		return;
  	}
  	printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
  	       rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
  	printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
  	       rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
  	printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
  	       rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
  	printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
  	       rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
  	if (regs->tstate & TSTATE_PRIV)
  		printk("I7: <%pS>\n", (void *) rwk->ins[7]);
  }
  
  void show_regs(struct pt_regs *regs)
  {
  	show_regs_print_info(KERN_DEFAULT);
  
  	printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x    %s\n", regs->tstate,
  	       regs->tpc, regs->tnpc, regs->y, print_tainted());
  	printk("TPC: <%pS>\n", (void *) regs->tpc);
  	printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
  	       regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
  	       regs->u_regs[3]);
  	printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
  	       regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
  	       regs->u_regs[7]);
  	printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
  	       regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
  	       regs->u_regs[11]);
  	printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
  	       regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
  	       regs->u_regs[15]);
  	printk("RPC: <%pS>\n", (void *) regs->u_regs[15]);
  	show_regwindow(regs);
  	show_stack(current, (unsigned long *)regs->u_regs[UREG_FP], KERN_DEFAULT);
  }
  
  union global_cpu_snapshot global_cpu_snapshot[NR_CPUS];
  static DEFINE_SPINLOCK(global_cpu_snapshot_lock);
  
  static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
  			      int this_cpu)
  {
  	struct global_reg_snapshot *rp;
  
  	flushw_all();
  
  	rp = &global_cpu_snapshot[this_cpu].reg;
  
  	rp->tstate = regs->tstate;
  	rp->tpc = regs->tpc;
  	rp->tnpc = regs->tnpc;
  	rp->o7 = regs->u_regs[UREG_I7];
  
  	if (regs->tstate & TSTATE_PRIV) {
  		struct reg_window *rw;
  
  		rw = (struct reg_window *)
  			(regs->u_regs[UREG_FP] + STACK_BIAS);
  		if (kstack_valid(tp, (unsigned long) rw)) {
  			rp->i7 = rw->ins[7];
  			rw = (struct reg_window *)
  				(rw->ins[6] + STACK_BIAS);
  			if (kstack_valid(tp, (unsigned long) rw))
  				rp->rpc = rw->ins[7];
  		}
  	} else {
  		rp->i7 = 0;
  		rp->rpc = 0;
  	}
  	rp->thread = tp;
  }
  
  /* In order to avoid hangs we do not try to synchronize with the
   * global register dump client cpus.  The last store they make is to
   * the thread pointer, so do a short poll waiting for that to become
   * non-NULL.
   */
  static void __global_reg_poll(struct global_reg_snapshot *gp)
  {
  	int limit = 0;
  
  	while (!gp->thread && ++limit < 100) {
  		barrier();
  		udelay(1);
  	}
  }
  
  void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)
  {
  	struct thread_info *tp = current_thread_info();
  	struct pt_regs *regs = get_irq_regs();
  	unsigned long flags;
  	int this_cpu, cpu;
  
  	if (!regs)
  		regs = tp->kregs;
  
  	spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
  
  	this_cpu = raw_smp_processor_id();
  
  	memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
  
  	if (cpumask_test_cpu(this_cpu, mask) && !exclude_self)
  		__global_reg_self(tp, regs, this_cpu);
  
  	smp_fetch_global_regs();
  
  	for_each_cpu(cpu, mask) {
  		struct global_reg_snapshot *gp;
  
  		if (exclude_self && cpu == this_cpu)
  			continue;
  
  		gp = &global_cpu_snapshot[cpu].reg;
  
  		__global_reg_poll(gp);
  
  		tp = gp->thread;
  		printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
  		       (cpu == this_cpu ? '*' : ' '), cpu,
  		       gp->tstate, gp->tpc, gp->tnpc,
  		       ((tp && tp->task) ? tp->task->comm : "NULL"),
  		       ((tp && tp->task) ? tp->task->pid : -1));
  
  		if (gp->tstate & TSTATE_PRIV) {
  			printk("             TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
  			       (void *) gp->tpc,
  			       (void *) gp->o7,
  			       (void *) gp->i7,
  			       (void *) gp->rpc);
  		} else {
  			printk("             TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
  			       gp->tpc, gp->o7, gp->i7, gp->rpc);
  		}
  
  		touch_nmi_watchdog();
  	}
  
  	memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
  
  	spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
  }
  
  #ifdef CONFIG_MAGIC_SYSRQ
  
  static void sysrq_handle_globreg(int key)
  {
  	trigger_all_cpu_backtrace();
  }
  
  static const struct sysrq_key_op sparc_globalreg_op = {
  	.handler	= sysrq_handle_globreg,
  	.help_msg	= "global-regs(y)",
  	.action_msg	= "Show Global CPU Regs",
  };
  
  static void __global_pmu_self(int this_cpu)
  {
  	struct global_pmu_snapshot *pp;
  	int i, num;
  
  	if (!pcr_ops)
  		return;
  
  	pp = &global_cpu_snapshot[this_cpu].pmu;
  
  	num = 1;
  	if (tlb_type == hypervisor &&
  	    sun4v_chip_type >= SUN4V_CHIP_NIAGARA4)
  		num = 4;
  
  	for (i = 0; i < num; i++) {
  		pp->pcr[i] = pcr_ops->read_pcr(i);
  		pp->pic[i] = pcr_ops->read_pic(i);
  	}
  }
  
  static void __global_pmu_poll(struct global_pmu_snapshot *pp)
  {
  	int limit = 0;
  
  	while (!pp->pcr[0] && ++limit < 100) {
  		barrier();
  		udelay(1);
  	}
  }
  
  static void pmu_snapshot_all_cpus(void)
  {
  	unsigned long flags;
  	int this_cpu, cpu;
  
  	spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
  
  	memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
  
  	this_cpu = raw_smp_processor_id();
  
  	__global_pmu_self(this_cpu);
  
  	smp_fetch_global_pmu();
  
  	for_each_online_cpu(cpu) {
  		struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu;
  
  		__global_pmu_poll(pp);
  
  		printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n",
  		       (cpu == this_cpu ? '*' : ' '), cpu,
  		       pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3],
  		       pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]);
  
  		touch_nmi_watchdog();
  	}
  
  	memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
  
  	spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
  }
  
  static void sysrq_handle_globpmu(int key)
  {
  	pmu_snapshot_all_cpus();
  }
  
  static const struct sysrq_key_op sparc_globalpmu_op = {
  	.handler	= sysrq_handle_globpmu,
  	.help_msg	= "global-pmu(x)",
  	.action_msg	= "Show Global PMU Regs",
  };
  
  static int __init sparc_sysrq_init(void)
  {
  	int ret = register_sysrq_key('y', &sparc_globalreg_op);
  
  	if (!ret)
  		ret = register_sysrq_key('x', &sparc_globalpmu_op);
  	return ret;
  }
  
  core_initcall(sparc_sysrq_init);
  
  #endif
  
  /* Free current thread data structures etc.. */
  void exit_thread(struct task_struct *tsk)
  {
  	struct thread_info *t = task_thread_info(tsk);
  
  	if (t->utraps) {
  		if (t->utraps[0] < 2)
  			kfree (t->utraps);
  		else
  			t->utraps[0]--;
  	}
  }
  
  void flush_thread(void)
  {
  	struct thread_info *t = current_thread_info();
  	struct mm_struct *mm;
  
  	mm = t->task->mm;
  	if (mm)
  		tsb_context_switch(mm);
  
  	set_thread_wsaved(0);
  
  	/* Clear FPU register state. */
  	t->fpsaved[0] = 0;
  }
  
  /* It's a bit more tricky when 64-bit tasks are involved... */
  static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
  {
  	bool stack_64bit = test_thread_64bit_stack(psp);
  	unsigned long fp, distance, rval;
  
  	if (stack_64bit) {
  		csp += STACK_BIAS;
  		psp += STACK_BIAS;
  		__get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
  		fp += STACK_BIAS;
  		if (test_thread_flag(TIF_32BIT))
  			fp &= 0xffffffff;
  	} else
  		__get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
  
  	/* Now align the stack as this is mandatory in the Sparc ABI
  	 * due to how register windows work.  This hides the
  	 * restriction from thread libraries etc.
  	 */
  	csp &= ~15UL;
  
  	distance = fp - psp;
  	rval = (csp - distance);
  	if (raw_copy_in_user((void __user *)rval, (void __user *)psp, distance))
  		rval = 0;
  	else if (!stack_64bit) {
  		if (put_user(((u32)csp),
  			     &(((struct reg_window32 __user *)rval)->ins[6])))
  			rval = 0;
  	} else {
  		if (put_user(((u64)csp - STACK_BIAS),
  			     &(((struct reg_window __user *)rval)->ins[6])))
  			rval = 0;
  		else
  			rval = rval - STACK_BIAS;
  	}
  
  	return rval;
  }
  
  /* Standard stuff. */
  static inline void shift_window_buffer(int first_win, int last_win,
  				       struct thread_info *t)
  {
  	int i;
  
  	for (i = first_win; i < last_win; i++) {
  		t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
  		memcpy(&t->reg_window[i], &t->reg_window[i+1],
  		       sizeof(struct reg_window));
  	}
  }
  
  void synchronize_user_stack(void)
  {
  	struct thread_info *t = current_thread_info();
  	unsigned long window;
  
  	flush_user_windows();
  	if ((window = get_thread_wsaved()) != 0) {
  		window -= 1;
  		do {
  			struct reg_window *rwin = &t->reg_window[window];
  			int winsize = sizeof(struct reg_window);
  			unsigned long sp;
  
  			sp = t->rwbuf_stkptrs[window];
  
  			if (test_thread_64bit_stack(sp))
  				sp += STACK_BIAS;
  			else
  				winsize = sizeof(struct reg_window32);
  
  			if (!copy_to_user((char __user *)sp, rwin, winsize)) {
  				shift_window_buffer(window, get_thread_wsaved() - 1, t);
  				set_thread_wsaved(get_thread_wsaved() - 1);
  			}
  		} while (window--);
  	}
  }
  
  static void stack_unaligned(unsigned long sp)
  {
  	force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *) sp);
  }
  
  static const char uwfault32[] = KERN_INFO \
  	"%s[%d]: bad register window fault: SP %08lx (orig_sp %08lx) TPC %08lx O7 %08lx\n";
  static const char uwfault64[] = KERN_INFO \
  	"%s[%d]: bad register window fault: SP %016lx (orig_sp %016lx) TPC %08lx O7 %016lx\n";
  
  void fault_in_user_windows(struct pt_regs *regs)
  {
  	struct thread_info *t = current_thread_info();
  	unsigned long window;
  
  	flush_user_windows();
  	window = get_thread_wsaved();
  
  	if (likely(window != 0)) {
  		window -= 1;
  		do {
  			struct reg_window *rwin = &t->reg_window[window];
  			int winsize = sizeof(struct reg_window);
  			unsigned long sp, orig_sp;
  
  			orig_sp = sp = t->rwbuf_stkptrs[window];
  
  			if (test_thread_64bit_stack(sp))
  				sp += STACK_BIAS;
  			else
  				winsize = sizeof(struct reg_window32);
  
  			if (unlikely(sp & 0x7UL))
  				stack_unaligned(sp);
  
  			if (unlikely(copy_to_user((char __user *)sp,
  						  rwin, winsize))) {
  				if (show_unhandled_signals)
  					printk_ratelimited(is_compat_task() ?
  							   uwfault32 : uwfault64,
  							   current->comm, current->pid,
  							   sp, orig_sp,
  							   regs->tpc,
  							   regs->u_regs[UREG_I7]);
  				goto barf;
  			}
  		} while (window--);
  	}
  	set_thread_wsaved(0);
  	return;
  
  barf:
  	set_thread_wsaved(window + 1);
  	force_sig(SIGSEGV);
  }
  
  /* Copy a Sparc thread.  The fork() return value conventions
   * under SunOS are nothing short of bletcherous:
   * Parent -->  %o0 == childs  pid, %o1 == 0
   * Child  -->  %o0 == parents pid, %o1 == 1
   */
  int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long arg,
  		struct task_struct *p, unsigned long tls)
  {
  	struct thread_info *t = task_thread_info(p);
  	struct pt_regs *regs = current_pt_regs();
  	struct sparc_stackf *parent_sf;
  	unsigned long child_stack_sz;
  	char *child_trap_frame;
  
  	/* Calculate offset to stack_frame & pt_regs */
  	child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ);
  	child_trap_frame = (task_stack_page(p) +
  			    (THREAD_SIZE - child_stack_sz));
  
  	t->new_child = 1;
  	t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
  	t->kregs = (struct pt_regs *) (child_trap_frame +
  				       sizeof(struct sparc_stackf));
  	t->fpsaved[0] = 0;
  
  	if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) {
  		memset(child_trap_frame, 0, child_stack_sz);
  		__thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = 
  			(current_pt_regs()->tstate + 1) & TSTATE_CWP;
  		t->current_ds = ASI_P;
  		t->kregs->u_regs[UREG_G1] = sp; /* function */
  		t->kregs->u_regs[UREG_G2] = arg;
  		return 0;
  	}
  
  	parent_sf = ((struct sparc_stackf *) regs) - 1;
  	memcpy(child_trap_frame, parent_sf, child_stack_sz);
  	if (t->flags & _TIF_32BIT) {
  		sp &= 0x00000000ffffffffUL;
  		regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
  	}
  	t->kregs->u_regs[UREG_FP] = sp;
  	__thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = 
  		(regs->tstate + 1) & TSTATE_CWP;
  	t->current_ds = ASI_AIUS;
  	if (sp != regs->u_regs[UREG_FP]) {
  		unsigned long csp;
  
  		csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
  		if (!csp)
  			return -EFAULT;
  		t->kregs->u_regs[UREG_FP] = csp;
  	}
  	if (t->utraps)
  		t->utraps[0]++;
  
  	/* Set the return value for the child. */
  	t->kregs->u_regs[UREG_I0] = current->pid;
  	t->kregs->u_regs[UREG_I1] = 1;
  
  	/* Set the second return value for the parent. */
  	regs->u_regs[UREG_I1] = 0;
  
  	if (clone_flags & CLONE_SETTLS)
  		t->kregs->u_regs[UREG_G7] = tls;
  
  	return 0;
  }
  
  /* TIF_MCDPER in thread info flags for current task is updated lazily upon
   * a context switch. Update this flag in current task's thread flags
   * before dup so the dup'd task will inherit the current TIF_MCDPER flag.
   */
  int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
  {
  	if (adi_capable()) {
  		register unsigned long tmp_mcdper;
  
  		__asm__ __volatile__(
  			".word 0x83438000\n\t"	/* rd  %mcdper, %g1 */
  			"mov %%g1, %0\n\t"
  			: "=r" (tmp_mcdper)
  			:
  			: "g1");
  		if (tmp_mcdper)
  			set_thread_flag(TIF_MCDPER);
  		else
  			clear_thread_flag(TIF_MCDPER);
  	}
  
  	*dst = *src;
  	return 0;
  }
  
  unsigned long get_wchan(struct task_struct *task)
  {
  	unsigned long pc, fp, bias = 0;
  	struct thread_info *tp;
  	struct reg_window *rw;
          unsigned long ret = 0;
  	int count = 0; 
  
  	if (!task || task == current || task_is_running(task))
  		goto out;
  
  	tp = task_thread_info(task);
  	bias = STACK_BIAS;
  	fp = task_thread_info(task)->ksp + bias;
  
  	do {
  		if (!kstack_valid(tp, fp))
  			break;
  		rw = (struct reg_window *) fp;
  		pc = rw->ins[7];
  		if (!in_sched_functions(pc)) {
  			ret = pc;
  			goto out;
  		}
  		fp = rw->ins[6] + bias;
  	} while (++count < 16);
  
  out:
  	return ret;
  }
  