// SPDX-License-Identifier: GPL-2.0/* * Stack dumping functions * *  Copyright IBM Corp. 1999, 2013 */ #include <linux/kallsyms.h>#include <linux/hardirq.h>#include <linux/kprobes.h>#include <linux/utsname.h>#include <linux/export.h>#include <linux/kdebug.h>#include <linux/ptrace.h>#include <linux/mm.h>#include <linux/module.h>#include <linux/sched.h>#include <linux/sched/debug.h>#include <linux/sched/task_stack.h>#include <asm/processor.h>#include <asm/debug.h>#include <asm/dis.h>#include <asm/ipl.h>#include <asm/unwind.h> const char *stack_type_name(enum stack_type type){	switch (type) {	case STACK_TYPE_TASK:		return "task";	case STACK_TYPE_IRQ:		return "irq";	case STACK_TYPE_NODAT:		return "nodat";	case STACK_TYPE_RESTART:		return "restart";	default:		return "unknown";	}}EXPORT_SYMBOL_GPL(stack_type_name); static inline bool in_stack(unsigned long sp, struct stack_info *info,			    enum stack_type type, unsigned long low,			    unsigned long high){	if (sp < low || sp >= high)		return false;	info->type = type;	info->begin = low;	info->end = high;	return true;} static bool in_task_stack(unsigned long sp, struct task_struct *task,			  struct stack_info *info){	unsigned long stack; 	stack = (unsigned long) task_stack_page(task);	return in_stack(sp, info, STACK_TYPE_TASK, stack, stack + THREAD_SIZE);} static bool in_irq_stack(unsigned long sp, struct stack_info *info){	unsigned long frame_size, top; 	frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);	top = S390_lowcore.async_stack + frame_size;	return in_stack(sp, info, STACK_TYPE_IRQ, top - THREAD_SIZE, top);} static bool in_nodat_stack(unsigned long sp, struct stack_info *info){	unsigned long frame_size, top; 	frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);	top = S390_lowcore.nodat_stack + frame_size;	return in_stack(sp, info, STACK_TYPE_NODAT, top - THREAD_SIZE, top);} static bool in_restart_stack(unsigned long sp, struct stack_info *info){	unsigned long frame_size, top; 	frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);	top = S390_lowcore.restart_stack + frame_size;	return in_stack(sp, info, STACK_TYPE_RESTART, top - THREAD_SIZE, top);} int get_stack_info(unsigned long sp, struct task_struct *task,		   struct stack_info *info, unsigned long *visit_mask){	if (!sp)		goto unknown; 	/* Sanity check: ABI requires SP to be aligned 8 bytes. */	if (sp & 0x7)		goto unknown; 	/* Check per-task stack */	if (in_task_stack(sp, task, info))		goto recursion_check; 	if (task != current)		goto unknown; 	/* Check per-cpu stacks */	if (!in_irq_stack(sp, info) &&	    !in_nodat_stack(sp, info) &&	    !in_restart_stack(sp, info))		goto unknown; recursion_check:	/*	 * Make sure we don't iterate through any given stack more than once.	 * If it comes up a second time then there's something wrong going on:	 * just break out and report an unknown stack type.	 */	if (*visit_mask & (1UL << info->type))		goto unknown;	*visit_mask |= 1UL << info->type;	return 0;unknown:	info->type = STACK_TYPE_UNKNOWN;	return -EINVAL;} void show_stack(struct task_struct *task, unsigned long *stack,		       const char *loglvl){	struct unwind_state state; 	printk("%sCall Trace:\n", loglvl);	unwind_for_each_frame(&state, task, NULL, (unsigned long) stack)		printk(state.reliable ? "%s [<%016lx>] %pSR \n" :					"%s([<%016lx>] %pSR)\n",		       loglvl, state.ip, (void *) state.ip);	debug_show_held_locks(task ? : current);} static void show_last_breaking_event(struct pt_regs *regs){	printk("Last Breaking-Event-Address:\n");	printk(" [<%016lx>] %pSR\n", regs->args[0], (void *)regs->args[0]);} void show_registers(struct pt_regs *regs){	struct psw_bits *psw = &psw_bits(regs->psw);	char *mode; 	mode = user_mode(regs) ? "User" : "Krnl";	printk("%s PSW : %px %px", mode, (void *)regs->psw.mask, (void *)regs->psw.addr);	if (!user_mode(regs))		pr_cont(" (%pSR)", (void *)regs->psw.addr);	pr_cont("\n");	printk("           R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "	       "P:%x AS:%x CC:%x PM:%x", psw->per, psw->dat, psw->io, psw->ext,	       psw->key, psw->mcheck, psw->wait, psw->pstate, psw->as, psw->cc, psw->pm);	pr_cont(" RI:%x EA:%x\n", psw->ri, psw->eaba);	printk("%s GPRS: %016lx %016lx %016lx %016lx\n", mode,	       regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);	printk("           %016lx %016lx %016lx %016lx\n",	       regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);	printk("           %016lx %016lx %016lx %016lx\n",	       regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);	printk("           %016lx %016lx %016lx %016lx\n",	       regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);	show_code(regs);} void show_regs(struct pt_regs *regs){	show_regs_print_info(KERN_DEFAULT);	show_registers(regs);	/* Show stack backtrace if pt_regs is from kernel mode */	if (!user_mode(regs))		show_stack(NULL, (unsigned long *) regs->gprs[15], KERN_DEFAULT);	show_last_breaking_event(regs);} static DEFINE_SPINLOCK(die_lock); void die(struct pt_regs *regs, const char *str){	static int die_counter; 	oops_enter();	lgr_info_log();	debug_stop_all();	console_verbose();	spin_lock_irq(&die_lock);	bust_spinlocks(1);	printk("%s: %04x ilc:%d [#%d] ", str, regs->int_code & 0xffff,	       regs->int_code >> 17, ++die_counter);#ifdef CONFIG_PREEMPT	pr_cont("PREEMPT ");#elif defined(CONFIG_PREEMPT_RT)	pr_cont("PREEMPT_RT ");#endif	pr_cont("SMP ");	if (debug_pagealloc_enabled())		pr_cont("DEBUG_PAGEALLOC");	pr_cont("\n");	notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);	print_modules();	show_regs(regs);	bust_spinlocks(0);	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);	spin_unlock_irq(&die_lock);	if (in_interrupt())		panic("Fatal exception in interrupt");	if (panic_on_oops)		panic("Fatal exception: panic_on_oops");	oops_exit();	do_exit(SIGSEGV);}