404 lines
9.9 KiB
C
404 lines
9.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#include <linux/module.h>
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#include <linux/personality.h>
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#include <linux/kallsyms.h>
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#include <linux/hardirq.h>
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#include <linux/kdebug.h>
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#include <linux/sched/task_stack.h>
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#include <linux/uaccess.h>
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#include <linux/ftrace.h>
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#include <asm/proc-fns.h>
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#include <asm/unistd.h>
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#include <asm/fpu.h>
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#include <linux/ptrace.h>
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#include <nds32_intrinsic.h>
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extern void show_pte(struct mm_struct *mm, unsigned long addr);
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/*
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* Dump out the contents of some memory nicely...
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*/
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void dump_mem(const char *lvl, unsigned long bottom, unsigned long top)
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{
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unsigned long first;
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mm_segment_t fs;
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int i;
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/*
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* We need to switch to kernel mode so that we can use __get_user
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* to safely read from kernel space. Note that we now dump the
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* code first, just in case the backtrace kills us.
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*/
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fs = get_fs();
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set_fs(KERNEL_DS);
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pr_emerg("%s(0x%08lx to 0x%08lx)\n", lvl, bottom, top);
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for (first = bottom & ~31; first < top; first += 32) {
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unsigned long p;
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char str[sizeof(" 12345678") * 8 + 1];
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memset(str, ' ', sizeof(str));
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str[sizeof(str) - 1] = '\0';
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for (p = first, i = 0; i < 8 && p < top; i++, p += 4) {
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if (p >= bottom && p < top) {
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unsigned long val;
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if (__get_user(val, (unsigned long *)p) == 0)
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sprintf(str + i * 9, " %08lx", val);
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else
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sprintf(str + i * 9, " ????????");
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}
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}
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pr_emerg("%s%04lx:%s\n", lvl, first & 0xffff, str);
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}
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set_fs(fs);
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}
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EXPORT_SYMBOL(dump_mem);
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static void dump_instr(struct pt_regs *regs)
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{
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unsigned long addr = instruction_pointer(regs);
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mm_segment_t fs;
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char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str;
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int i;
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return;
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/*
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* We need to switch to kernel mode so that we can use __get_user
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* to safely read from kernel space. Note that we now dump the
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* code first, just in case the backtrace kills us.
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*/
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fs = get_fs();
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set_fs(KERNEL_DS);
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pr_emerg("Code: ");
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for (i = -4; i < 1; i++) {
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unsigned int val, bad;
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bad = __get_user(val, &((u32 *) addr)[i]);
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if (!bad) {
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p += sprintf(p, i == 0 ? "(%08x) " : "%08x ", val);
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} else {
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p += sprintf(p, "bad PC value");
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break;
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}
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}
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pr_emerg("Code: %s\n", str);
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set_fs(fs);
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}
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#define LOOP_TIMES (100)
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static void __dump(struct task_struct *tsk, unsigned long *base_reg,
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const char *loglvl)
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{
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unsigned long ret_addr;
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int cnt = LOOP_TIMES, graph = 0;
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printk("%sCall Trace:\n", loglvl);
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if (!IS_ENABLED(CONFIG_FRAME_POINTER)) {
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while (!kstack_end(base_reg)) {
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ret_addr = *base_reg++;
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if (__kernel_text_address(ret_addr)) {
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ret_addr = ftrace_graph_ret_addr(
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tsk, &graph, ret_addr, NULL);
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print_ip_sym(loglvl, ret_addr);
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}
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if (--cnt < 0)
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break;
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}
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} else {
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while (!kstack_end((void *)base_reg) &&
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!((unsigned long)base_reg & 0x3) &&
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((unsigned long)base_reg >= TASK_SIZE)) {
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unsigned long next_fp;
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ret_addr = base_reg[LP_OFFSET];
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next_fp = base_reg[FP_OFFSET];
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if (__kernel_text_address(ret_addr)) {
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ret_addr = ftrace_graph_ret_addr(
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tsk, &graph, ret_addr, NULL);
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print_ip_sym(loglvl, ret_addr);
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}
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if (--cnt < 0)
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break;
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base_reg = (unsigned long *)next_fp;
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}
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}
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printk("%s\n", loglvl);
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}
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void show_stack(struct task_struct *tsk, unsigned long *sp, const char *loglvl)
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{
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unsigned long *base_reg;
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if (!tsk)
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tsk = current;
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if (!IS_ENABLED(CONFIG_FRAME_POINTER)) {
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if (tsk != current)
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base_reg = (unsigned long *)(tsk->thread.cpu_context.sp);
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else
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__asm__ __volatile__("\tori\t%0, $sp, #0\n":"=r"(base_reg));
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} else {
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if (tsk != current)
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base_reg = (unsigned long *)(tsk->thread.cpu_context.fp);
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else
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__asm__ __volatile__("\tori\t%0, $fp, #0\n":"=r"(base_reg));
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}
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__dump(tsk, base_reg, loglvl);
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barrier();
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}
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DEFINE_SPINLOCK(die_lock);
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/*
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* This function is protected against re-entrancy.
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*/
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void die(const char *str, struct pt_regs *regs, int err)
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{
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struct task_struct *tsk = current;
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static int die_counter;
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console_verbose();
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spin_lock_irq(&die_lock);
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bust_spinlocks(1);
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pr_emerg("Internal error: %s: %x [#%d]\n", str, err, ++die_counter);
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print_modules();
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pr_emerg("CPU: %i\n", smp_processor_id());
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show_regs(regs);
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pr_emerg("Process %s (pid: %d, stack limit = 0x%p)\n",
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tsk->comm, tsk->pid, end_of_stack(tsk));
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if (!user_mode(regs) || in_interrupt()) {
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dump_mem("Stack: ", regs->sp, (regs->sp + PAGE_SIZE) & PAGE_MASK);
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dump_instr(regs);
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dump_stack();
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}
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bust_spinlocks(0);
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spin_unlock_irq(&die_lock);
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do_exit(SIGSEGV);
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}
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EXPORT_SYMBOL(die);
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void die_if_kernel(const char *str, struct pt_regs *regs, int err)
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{
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if (user_mode(regs))
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return;
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die(str, regs, err);
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}
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int bad_syscall(int n, struct pt_regs *regs)
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{
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if (current->personality != PER_LINUX) {
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send_sig(SIGSEGV, current, 1);
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return regs->uregs[0];
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}
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force_sig_fault(SIGILL, ILL_ILLTRP,
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(void __user *)instruction_pointer(regs) - 4);
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die_if_kernel("Oops - bad syscall", regs, n);
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return regs->uregs[0];
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}
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void __pte_error(const char *file, int line, unsigned long val)
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{
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pr_emerg("%s:%d: bad pte %08lx.\n", file, line, val);
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}
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void __pmd_error(const char *file, int line, unsigned long val)
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{
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pr_emerg("%s:%d: bad pmd %08lx.\n", file, line, val);
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}
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void __pgd_error(const char *file, int line, unsigned long val)
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{
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pr_emerg("%s:%d: bad pgd %08lx.\n", file, line, val);
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}
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extern char *exception_vector, *exception_vector_end;
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void __init trap_init(void)
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{
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return;
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}
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void __init early_trap_init(void)
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{
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unsigned long ivb = 0;
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unsigned long base = PAGE_OFFSET;
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memcpy((unsigned long *)base, (unsigned long *)&exception_vector,
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((unsigned long)&exception_vector_end -
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(unsigned long)&exception_vector));
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ivb = __nds32__mfsr(NDS32_SR_IVB);
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/* Check platform support. */
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if (((ivb & IVB_mskNIVIC) >> IVB_offNIVIC) < 2)
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panic
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("IVIC mode is not allowed on the platform with interrupt controller\n");
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__nds32__mtsr((ivb & ~IVB_mskESZ) | (IVB_valESZ16 << IVB_offESZ) |
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IVB_BASE, NDS32_SR_IVB);
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__nds32__mtsr(INT_MASK_INITAIAL_VAL, NDS32_SR_INT_MASK);
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/*
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* 0x800 = 128 vectors * 16byte.
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* It should be enough to flush a page.
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*/
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cpu_cache_wbinval_page(base, true);
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}
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static void send_sigtrap(struct pt_regs *regs, int error_code, int si_code)
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{
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struct task_struct *tsk = current;
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tsk->thread.trap_no = ENTRY_DEBUG_RELATED;
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tsk->thread.error_code = error_code;
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force_sig_fault(SIGTRAP, si_code,
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(void __user *)instruction_pointer(regs));
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}
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void do_debug_trap(unsigned long entry, unsigned long addr,
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unsigned long type, struct pt_regs *regs)
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{
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if (notify_die(DIE_OOPS, "Oops", regs, addr, type, SIGTRAP)
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== NOTIFY_STOP)
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return;
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if (user_mode(regs)) {
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/* trap_signal */
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send_sigtrap(regs, 0, TRAP_BRKPT);
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} else {
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/* kernel_trap */
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if (!fixup_exception(regs))
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die("unexpected kernel_trap", regs, 0);
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}
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}
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void unhandled_interruption(struct pt_regs *regs)
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{
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pr_emerg("unhandled_interruption\n");
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show_regs(regs);
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if (!user_mode(regs))
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do_exit(SIGKILL);
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force_sig(SIGKILL);
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}
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void unhandled_exceptions(unsigned long entry, unsigned long addr,
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unsigned long type, struct pt_regs *regs)
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{
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pr_emerg("Unhandled Exception: entry: %lx addr:%lx itype:%lx\n", entry,
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addr, type);
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show_regs(regs);
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if (!user_mode(regs))
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do_exit(SIGKILL);
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force_sig(SIGKILL);
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}
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extern int do_page_fault(unsigned long entry, unsigned long addr,
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unsigned int error_code, struct pt_regs *regs);
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/*
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* 2:DEF dispatch for TLB MISC exception handler
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*/
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void do_dispatch_tlb_misc(unsigned long entry, unsigned long addr,
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unsigned long type, struct pt_regs *regs)
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{
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type = type & (ITYPE_mskINST | ITYPE_mskETYPE);
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if ((type & ITYPE_mskETYPE) < 5) {
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/* Permission exceptions */
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do_page_fault(entry, addr, type, regs);
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} else
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unhandled_exceptions(entry, addr, type, regs);
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}
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void do_revinsn(struct pt_regs *regs)
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{
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pr_emerg("Reserved Instruction\n");
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show_regs(regs);
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if (!user_mode(regs))
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do_exit(SIGILL);
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force_sig(SIGILL);
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}
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#ifdef CONFIG_ALIGNMENT_TRAP
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extern int unalign_access_mode;
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extern int do_unaligned_access(unsigned long addr, struct pt_regs *regs);
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#endif
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void do_dispatch_general(unsigned long entry, unsigned long addr,
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unsigned long itype, struct pt_regs *regs,
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unsigned long oipc)
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{
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unsigned int swid = itype >> ITYPE_offSWID;
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unsigned long type = itype & (ITYPE_mskINST | ITYPE_mskETYPE);
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if (type == ETYPE_ALIGNMENT_CHECK) {
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#ifdef CONFIG_ALIGNMENT_TRAP
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/* Alignment check */
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if (user_mode(regs) && unalign_access_mode) {
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int ret;
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ret = do_unaligned_access(addr, regs);
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if (ret == 0)
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return;
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if (ret == -EFAULT)
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pr_emerg
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("Unhandled unaligned access exception\n");
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}
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#endif
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do_page_fault(entry, addr, type, regs);
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} else if (type == ETYPE_RESERVED_INSTRUCTION) {
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/* Reserved instruction */
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do_revinsn(regs);
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} else if (type == ETYPE_COPROCESSOR) {
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/* Coprocessor */
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#if IS_ENABLED(CONFIG_FPU)
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unsigned int fucop_exist = __nds32__mfsr(NDS32_SR_FUCOP_EXIST);
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unsigned int cpid = ((itype & ITYPE_mskCPID) >> ITYPE_offCPID);
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if ((cpid == FPU_CPID) &&
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(fucop_exist & FUCOP_EXIST_mskCP0ISFPU)) {
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unsigned int subtype = (itype & ITYPE_mskSTYPE);
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if (true == do_fpu_exception(subtype, regs))
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return;
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}
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#endif
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unhandled_exceptions(entry, addr, type, regs);
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} else if (type == ETYPE_TRAP && swid == SWID_RAISE_INTERRUPT_LEVEL) {
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/* trap, used on v3 EDM target debugging workaround */
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/*
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* DIPC(OIPC) is passed as parameter before
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* interrupt is enabled, so the DIPC will not be corrupted
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* even though interrupts are coming in
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*/
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/*
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* 1. update ipc
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* 2. update pt_regs ipc with oipc
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* 3. update pt_regs ipsw (clear DEX)
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*/
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__asm__ volatile ("mtsr %0, $IPC\n\t"::"r" (oipc));
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regs->ipc = oipc;
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if (regs->pipsw & PSW_mskDEX) {
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pr_emerg
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("Nested Debug exception is possibly happened\n");
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pr_emerg("ipc:%08x pipc:%08x\n",
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(unsigned int)regs->ipc,
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(unsigned int)regs->pipc);
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}
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do_debug_trap(entry, addr, itype, regs);
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regs->ipsw &= ~PSW_mskDEX;
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} else
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unhandled_exceptions(entry, addr, type, regs);
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}
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