/*  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 <stdarg.h> #include <linux/errno.h>#include <linux/export.h>#include <linux/sched.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/elfcore.h>#include <linux/sysrq.h>#include <linux/nmi.h> #include <asm/uaccess.h>#include <asm/page.h>#include <asm/pgalloc.h>#include <asm/pgtable.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 "kstack.h" static void sparc64_yield(int cpu){	if (tlb_type != hypervisor) {		touch_nmi_watchdog();		return;	} 	clear_thread_flag(TIF_POLLING_NRFLAG);	smp_mb__after_clear_bit(); 	while (!need_resched() && !cpu_is_offline(cpu)) {		unsigned long pstate; 		/* Disable interrupts. */		__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(cpu))			sun4v_cpu_yield(); 		/* 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));	} 	set_thread_flag(TIF_POLLING_NRFLAG);} /* The idle loop on sparc64. */void cpu_idle(void){	int cpu = smp_processor_id(); 	set_thread_flag(TIF_POLLING_NRFLAG); 	while(1) {		tick_nohz_idle_enter();		rcu_idle_enter(); 		while (!need_resched() && !cpu_is_offline(cpu))			sparc64_yield(cpu); 		rcu_idle_exit();		tick_nohz_idle_exit(); #ifdef CONFIG_HOTPLUG_CPU		if (cpu_is_offline(cpu)) {			sched_preempt_enable_no_resched();			cpu_play_dead();		}#endif		schedule_preempt_disabled();	}} #ifdef CONFIG_COMPATstatic 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)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){	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]);} struct global_reg_snapshot global_reg_snapshot[NR_CPUS];static DEFINE_SPINLOCK(global_reg_snapshot_lock); static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,			      int this_cpu){	flushw_all(); 	global_reg_snapshot[this_cpu].tstate = regs->tstate;	global_reg_snapshot[this_cpu].tpc = regs->tpc;	global_reg_snapshot[this_cpu].tnpc = regs->tnpc;	global_reg_snapshot[this_cpu].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)) {			global_reg_snapshot[this_cpu].i7 = rw->ins[7];			rw = (struct reg_window *)				(rw->ins[6] + STACK_BIAS);			if (kstack_valid(tp, (unsigned long) rw))				global_reg_snapshot[this_cpu].rpc = rw->ins[7];		}	} else {		global_reg_snapshot[this_cpu].i7 = 0;		global_reg_snapshot[this_cpu].rpc = 0;	}	global_reg_snapshot[this_cpu].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_all_cpu_backtrace(void){	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_reg_snapshot_lock, flags); 	memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); 	this_cpu = raw_smp_processor_id(); 	__global_reg_self(tp, regs, this_cpu); 	smp_fetch_global_regs(); 	for_each_online_cpu(cpu) {		struct global_reg_snapshot *gp = &global_reg_snapshot[cpu]; 		__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);		}	} 	memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); 	spin_unlock_irqrestore(&global_reg_snapshot_lock, flags);} #ifdef CONFIG_MAGIC_SYSRQ static void sysrq_handle_globreg(int key){	arch_trigger_all_cpu_backtrace();} static struct sysrq_key_op sparc_globalreg_op = {	.handler	= sysrq_handle_globreg,	.help_msg	= "Globalregs",	.action_msg	= "Show Global CPU Regs",}; static int __init sparc_globreg_init(void){	return register_sysrq_key('y', &sparc_globalreg_op);} core_initcall(sparc_globreg_init); #endif unsigned long thread_saved_pc(struct task_struct *tsk){	struct thread_info *ti = task_thread_info(tsk);	unsigned long ret = 0xdeadbeefUL;		if (ti && ti->ksp) {		unsigned long *sp;		sp = (unsigned long *)(ti->ksp + STACK_BIAS);		if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&		    sp[14]) {			unsigned long *fp;			fp = (unsigned long *)(sp[14] + STACK_BIAS);			if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)				ret = fp[15];		}	}	return ret;} /* Free current thread data structures etc.. */void exit_thread(void){	struct thread_info *t = current_thread_info(); 	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){	unsigned long fp, distance, rval; 	if (!(test_thread_flag(TIF_32BIT))) {		csp += STACK_BIAS;		psp += STACK_BIAS;		__get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));		fp += STACK_BIAS;	} 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 (copy_in_user((void __user *) rval, (void __user *) psp, distance))		rval = 0;	else if (test_thread_flag(TIF_32BIT)) {		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) {		int winsize = sizeof(struct reg_window);		int bias = 0; 		if (test_thread_flag(TIF_32BIT))			winsize = sizeof(struct reg_window32);		else			bias = STACK_BIAS; 		window -= 1;		do {			unsigned long sp = (t->rwbuf_stkptrs[window] + bias);			struct reg_window *rwin = &t->reg_window[window]; 			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){	siginfo_t info; 	info.si_signo = SIGBUS;	info.si_errno = 0;	info.si_code = BUS_ADRALN;	info.si_addr = (void __user *) sp;	info.si_trapno = 0;	force_sig_info(SIGBUS, &info, current);} void fault_in_user_windows(void){	struct thread_info *t = current_thread_info();	unsigned long window;	int winsize = sizeof(struct reg_window);	int bias = 0; 	if (test_thread_flag(TIF_32BIT))		winsize = sizeof(struct reg_window32);	else		bias = STACK_BIAS; 	flush_user_windows();	window = get_thread_wsaved(); 	if (likely(window != 0)) {		window -= 1;		do {			unsigned long sp = (t->rwbuf_stkptrs[window] + bias);			struct reg_window *rwin = &t->reg_window[window]; 			if (unlikely(sp & 0x7UL))				stack_unaligned(sp); 			if (unlikely(copy_to_user((char __user *)sp,						  rwin, winsize)))				goto barf;		} while (window--);	}	set_thread_wsaved(0);	return; barf:	set_thread_wsaved(window + 1);	do_exit(SIGILL);} asmlinkage long sparc_do_fork(unsigned long clone_flags,

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