path: root/arch/loongarch/kernel/traps.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Author: Huacai Chen <chenhuacai@loongson.cn>
 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
 */
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/compiler.h>
#include <linux/context_tracking.h>
#include <linux/entry-common.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/kexec.h>
#include <linux/module.h>
#include <linux/extable.h>
#include <linux/mm.h>
#include <linux/sched/mm.h>
#include <linux/sched/debug.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/kallsyms.h>
#include <linux/memblock.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/kgdb.h>
#include <linux/kdebug.h>
#include <linux/notifier.h>
#include <linux/irq.h>
#include <linux/perf_event.h>

#include <asm/addrspace.h>
#include <asm/bootinfo.h>
#include <asm/branch.h>
#include <asm/break.h>
#include <asm/cpu.h>
#include <asm/exception.h>
#include <asm/fpu.h>
#include <asm/lbt.h>
#include <asm/inst.h>
#include <asm/kgdb.h>
#include <asm/loongarch.h>
#include <asm/mmu_context.h>
#include <asm/pgtable.h>
#include <asm/ptrace.h>
#include <asm/sections.h>
#include <asm/siginfo.h>
#include <asm/stacktrace.h>
#include <asm/tlb.h>
#include <asm/types.h>
#include <asm/unwind.h>
#include <asm/uprobes.h>

#include "access-helper.h"

static void show_backtrace(struct task_struct *task, const struct pt_regs *regs,
			   const char *loglvl, bool user)
{
	unsigned long addr;
	struct unwind_state state;
	struct pt_regs *pregs = (struct pt_regs *)regs;

	if (!task)
		task = current;

	printk("%sCall Trace:", loglvl);
	for (unwind_start(&state, task, pregs);
	      !unwind_done(&state); unwind_next_frame(&state)) {
		addr = unwind_get_return_address(&state);
		print_ip_sym(loglvl, addr);
	}
	printk("%s\n", loglvl);
}

static void show_stacktrace(struct task_struct *task,
	const struct pt_regs *regs, const char *loglvl, bool user)
{
	int i;
	const int field = 2 * sizeof(unsigned long);
	unsigned long stackdata;
	unsigned long *sp = (unsigned long *)regs->regs[3];

	printk("%sStack :", loglvl);
	i = 0;
	while ((unsigned long) sp & (PAGE_SIZE - 1)) {
		if (i && ((i % (64 / field)) == 0)) {
			pr_cont("\n");
			printk("%s       ", loglvl);
		}
		if (i > 39) {
			pr_cont(" ...");
			break;
		}

		if (__get_addr(&stackdata, sp++, user)) {
			pr_cont(" (Bad stack address)");
			break;
		}

		pr_cont(" %0*lx", field, stackdata);
		i++;
	}
	pr_cont("\n");
	show_backtrace(task, regs, loglvl, user);
}

void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl)
{
	struct pt_regs regs;

	regs.csr_crmd = 0;
	if (sp) {
		regs.csr_era = 0;
		regs.regs[1] = 0;
		regs.regs[3] = (unsigned long)sp;
	} else {
		if (!task || task == current)
			prepare_frametrace(&regs);
		else {
			regs.csr_era = task->thread.reg01;
			regs.regs[1] = 0;
			regs.regs[3] = task->thread.reg03;
			regs.regs[22] = task->thread.reg22;
		}
	}

	show_stacktrace