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"

void *exception_table[EXCCODE_INT_START] = {
	[0 ... EXCCODE_INT_START - 1] = handle_reserved,

	[EXCCODE_TLBI]		= handle_tlb_load,
	[EXCCODE_TLBL]		= handle_tlb_load,
	[EXCCODE_TLBS]		= handle_tlb_store,
	[EXCCODE_TLBM]		= handle_tlb_modify,
	[EXCCODE_TLBNR]		= handle_tlb_protect,
	[EXCCODE_TLBNX]		= handle_tlb_protect,
	[EXCCODE_TLBPE]		= handle_tlb_protect,
	[EXCCODE_ADE]		= handle_ade,
	[EXCCODE_ALE]		= handle_ale,
	[EXCCODE_BCE]		= handle_bce,
	[EXCCODE_SYS]		= handle_sys,
	[EXCCODE_BP]		= handle_bp,
	[EXCCODE_INE]		= handle_ri,
	[EXCCODE_IPE]		= handle_ri,
	[EXCCODE_FPDIS]		= handle_fpu,
	[EXCCODE_LSXDIS]	= handle_lsx,
	[EXCCODE_LASXDIS]	= handle_lasx,
	[EXCCODE_FPE]		= handle_fpe,
	[EXCCODE_WATCH]		= handle_watch,
	[EXCCODE_BTDIS]		= handle_lbt,
};
EXPORT_SYMBOL_GPL(exception_table);

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)) {