470 lines
12 KiB
C
470 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* OpenRISC traps.c
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*
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* Linux architectural port borrowing liberally from similar works of
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* others. All original copyrights apply as per the original source
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* declaration.
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*
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* Modifications for the OpenRISC architecture:
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* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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*
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* Here we handle the break vectors not used by the system call
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* mechanism, as well as some general stack/register dumping
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* things.
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*/
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/sched/task_stack.h>
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#include <linux/kernel.h>
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#include <linux/extable.h>
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#include <linux/kmod.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/kallsyms.h>
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#include <linux/uaccess.h>
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#include <asm/io.h>
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#include <asm/unwinder.h>
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#include <asm/sections.h>
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static int kstack_depth_to_print = 0x180;
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int lwa_flag;
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static unsigned long __user *lwa_addr;
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static void print_trace(void *data, unsigned long addr, int reliable)
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{
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const char *loglvl = data;
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printk("%s[<%p>] %s%pS\n", loglvl, (void *) addr, reliable ? "" : "? ",
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(void *) addr);
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}
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static void print_data(unsigned long base_addr, unsigned long word, int i)
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{
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if (i == 0)
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printk("(%08lx:)\t%08lx", base_addr + (i * 4), word);
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else
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printk(" %08lx:\t%08lx", base_addr + (i * 4), word);
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}
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/* displays a short stack trace */
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void show_stack(struct task_struct *task, unsigned long *esp, const char *loglvl)
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{
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if (esp == NULL)
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esp = (unsigned long *)&esp;
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printk("%sCall trace:\n", loglvl);
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unwind_stack((void *)loglvl, esp, print_trace);
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}
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void show_registers(struct pt_regs *regs)
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{
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int i;
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int in_kernel = 1;
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unsigned long esp;
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esp = (unsigned long)(regs->sp);
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if (user_mode(regs))
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in_kernel = 0;
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printk("CPU #: %d\n"
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" PC: %08lx SR: %08lx SP: %08lx\n",
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smp_processor_id(), regs->pc, regs->sr, regs->sp);
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printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
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0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
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printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
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regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
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printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
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regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
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printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
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regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
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printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
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regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
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printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
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regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
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printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
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regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
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printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
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regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
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printk(" RES: %08lx oGPR11: %08lx\n",
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regs->gpr[11], regs->orig_gpr11);
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printk("Process %s (pid: %d, stackpage=%08lx)\n",
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current->comm, current->pid, (unsigned long)current);
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/*
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* When in-kernel, we also print out the stack and code at the
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* time of the fault..
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*/
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if (in_kernel) {
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printk("\nStack: ");
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show_stack(NULL, (unsigned long *)esp, KERN_EMERG);
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if (esp < PAGE_OFFSET)
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goto bad_stack;
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printk("\n");
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for (i = -8; i < 24; i += 1) {
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unsigned long word;
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if (__get_user(word, &((unsigned long *)esp)[i])) {
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bad_stack:
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printk(" Bad Stack value.");
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break;
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}
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print_data(esp, word, i);
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}
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printk("\nCode: ");
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if (regs->pc < PAGE_OFFSET)
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goto bad;
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for (i = -6; i < 6; i += 1) {
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unsigned long word;
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if (__get_user(word, &((unsigned long *)regs->pc)[i])) {
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bad:
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printk(" Bad PC value.");
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break;
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}
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print_data(regs->pc, word, i);
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}
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}
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printk("\n");
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}
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void nommu_dump_state(struct pt_regs *regs,
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unsigned long ea, unsigned long vector)
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{
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int i;
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unsigned long addr, stack = regs->sp;
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printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
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printk("CPU #: %d\n"
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" PC: %08lx SR: %08lx SP: %08lx\n",
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0, regs->pc, regs->sr, regs->sp);
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printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
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0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
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printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
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regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
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printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
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regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
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printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
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regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
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printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
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regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
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printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
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regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
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printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
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regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
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printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
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regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
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printk(" RES: %08lx oGPR11: %08lx\n",
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regs->gpr[11], regs->orig_gpr11);
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printk("Process %s (pid: %d, stackpage=%08lx)\n",
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((struct task_struct *)(__pa(current)))->comm,
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((struct task_struct *)(__pa(current)))->pid,
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(unsigned long)current);
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printk("\nStack: ");
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printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
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for (i = 0; i < kstack_depth_to_print; i++) {
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if (((long)stack & (THREAD_SIZE - 1)) == 0)
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break;
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stack++;
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printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
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*((unsigned long *)(__pa(stack))));
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}
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printk("\n");
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printk("Call Trace: ");
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i = 1;
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while (((long)stack & (THREAD_SIZE - 1)) != 0) {
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addr = *((unsigned long *)__pa(stack));
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stack++;
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if (kernel_text_address(addr)) {
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if (i && ((i % 6) == 0))
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printk("\n ");
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printk(" [<%08lx>]", addr);
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i++;
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}
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}
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printk("\n");
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printk("\nCode: ");
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for (i = -24; i < 24; i++) {
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unsigned long word;
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word = ((unsigned long *)(__pa(regs->pc)))[i];
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print_data(regs->pc, word, i);
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}
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printk("\n");
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}
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/* This is normally the 'Oops' routine */
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void __noreturn die(const char *str, struct pt_regs *regs, long err)
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{
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console_verbose();
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printk("\n%s#: %04lx\n", str, err & 0xffff);
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show_registers(regs);
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#ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
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printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
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/* shut down interrupts */
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local_irq_disable();
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__asm__ __volatile__("l.nop 1");
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do {} while (1);
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#endif
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make_task_dead(SIGSEGV);
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}
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asmlinkage void unhandled_exception(struct pt_regs *regs, int ea, int vector)
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{
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printk("Unable to handle exception at EA =0x%x, vector 0x%x",
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ea, vector);
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die("Oops", regs, 9);
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}
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asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
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{
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force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc);
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}
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asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
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{
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if (user_mode(regs)) {
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/* Send a SIGBUS */
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force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address);
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} else {
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printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
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show_registers(regs);
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die("Die:", regs, address);
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}
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}
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asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
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{
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if (user_mode(regs)) {
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/* Send a SIGBUS */
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force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address);
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} else { /* Kernel mode */
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printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
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show_registers(regs);
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die("Die:", regs, address);
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}
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}
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static inline int in_delay_slot(struct pt_regs *regs)
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{
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#ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
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/* No delay slot flag, do the old way */
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unsigned int op, insn;
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insn = *((unsigned int *)regs->pc);
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op = insn >> 26;
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switch (op) {
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case 0x00: /* l.j */
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case 0x01: /* l.jal */
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case 0x03: /* l.bnf */
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case 0x04: /* l.bf */
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case 0x11: /* l.jr */
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case 0x12: /* l.jalr */
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return 1;
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default:
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return 0;
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}
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#else
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return mfspr(SPR_SR) & SPR_SR_DSX;
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#endif
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}
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static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
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{
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int displacement;
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unsigned int rb, op, jmp;
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if (unlikely(in_delay_slot(regs))) {
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/* In delay slot, instruction at pc is a branch, simulate it */
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jmp = *((unsigned int *)regs->pc);
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displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
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rb = (jmp & 0x0000ffff) >> 11;
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op = jmp >> 26;
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switch (op) {
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case 0x00: /* l.j */
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regs->pc += displacement;
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return;
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case 0x01: /* l.jal */
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regs->pc += displacement;
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regs->gpr[9] = regs->pc + 8;
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return;
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case 0x03: /* l.bnf */
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if (regs->sr & SPR_SR_F)
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regs->pc += 8;
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else
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regs->pc += displacement;
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return;
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case 0x04: /* l.bf */
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if (regs->sr & SPR_SR_F)
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regs->pc += displacement;
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else
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regs->pc += 8;
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return;
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case 0x11: /* l.jr */
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regs->pc = regs->gpr[rb];
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return;
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case 0x12: /* l.jalr */
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regs->pc = regs->gpr[rb];
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regs->gpr[9] = regs->pc + 8;
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return;
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default:
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break;
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}
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} else {
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regs->pc += 4;
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}
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}
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static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
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unsigned int insn)
|
||
|
|
{
|
||
|
|
unsigned int ra, rd;
|
||
|
|
unsigned long value;
|
||
|
|
unsigned long orig_pc;
|
||
|
|
long imm;
|
||
|
|
|
||
|
|
const struct exception_table_entry *entry;
|
||
|
|
|
||
|
|
orig_pc = regs->pc;
|
||
|
|
adjust_pc(regs, address);
|
||
|
|
|
||
|
|
ra = (insn >> 16) & 0x1f;
|
||
|
|
rd = (insn >> 21) & 0x1f;
|
||
|
|
imm = (short)insn;
|
||
|
|
lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
|
||
|
|
|
||
|
|
if ((unsigned long)lwa_addr & 0x3) {
|
||
|
|
do_unaligned_access(regs, address);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (get_user(value, lwa_addr)) {
|
||
|
|
if (user_mode(regs)) {
|
||
|
|
force_sig(SIGSEGV);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((entry = search_exception_tables(orig_pc))) {
|
||
|
|
regs->pc = entry->fixup;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* kernel access in kernel space, load it directly */
|
||
|
|
value = *((unsigned long *)lwa_addr);
|
||
|
|
}
|
||
|
|
|
||
|
|
lwa_flag = 1;
|
||
|
|
regs->gpr[rd] = value;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
|
||
|
|
unsigned int insn)
|
||
|
|
{
|
||
|
|
unsigned long __user *vaddr;
|
||
|
|
unsigned long orig_pc;
|
||
|
|
unsigned int ra, rb;
|
||
|
|
long imm;
|
||
|
|
|
||
|
|
const struct exception_table_entry *entry;
|
||
|
|
|
||
|
|
orig_pc = regs->pc;
|
||
|
|
adjust_pc(regs, address);
|
||
|
|
|
||
|
|
ra = (insn >> 16) & 0x1f;
|
||
|
|
rb = (insn >> 11) & 0x1f;
|
||
|
|
imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
|
||
|
|
vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
|
||
|
|
|
||
|
|
if (!lwa_flag || vaddr != lwa_addr) {
|
||
|
|
regs->sr &= ~SPR_SR_F;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((unsigned long)vaddr & 0x3) {
|
||
|
|
do_unaligned_access(regs, address);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (put_user(regs->gpr[rb], vaddr)) {
|
||
|
|
if (user_mode(regs)) {
|
||
|
|
force_sig(SIGSEGV);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((entry = search_exception_tables(orig_pc))) {
|
||
|
|
regs->pc = entry->fixup;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* kernel access in kernel space, store it directly */
|
||
|
|
*((unsigned long *)vaddr) = regs->gpr[rb];
|
||
|
|
}
|
||
|
|
|
||
|
|
lwa_flag = 0;
|
||
|
|
regs->sr |= SPR_SR_F;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define INSN_LWA 0x1b
|
||
|
|
#define INSN_SWA 0x33
|
||
|
|
|
||
|
|
asmlinkage void do_illegal_instruction(struct pt_regs *regs,
|
||
|
|
unsigned long address)
|
||
|
|
{
|
||
|
|
unsigned int op;
|
||
|
|
unsigned int insn = *((unsigned int *)address);
|
||
|
|
|
||
|
|
op = insn >> 26;
|
||
|
|
|
||
|
|
switch (op) {
|
||
|
|
case INSN_LWA:
|
||
|
|
simulate_lwa(regs, address, insn);
|
||
|
|
return;
|
||
|
|
|
||
|
|
case INSN_SWA:
|
||
|
|
simulate_swa(regs, address, insn);
|
||
|
|
return;
|
||
|
|
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (user_mode(regs)) {
|
||
|
|
/* Send a SIGILL */
|
||
|
|
force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address);
|
||
|
|
} else { /* Kernel mode */
|
||
|
|
printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
|
||
|
|
address);
|
||
|
|
show_registers(regs);
|
||
|
|
die("Die:", regs, address);
|
||
|
|
}
|
||
|
|
}
|