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    Subject[PATCH v3 15/19] OpenRISC: Traps
    Date

    Signed-off-by: Jonas Bonn <jonas@southpole.se>
    Reviewed-by: Arnd Bergmann <arnd@arndb.de>
    ---
    arch/openrisc/kernel/traps.c | 366 ++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 366 insertions(+), 0 deletions(-)
    create mode 100644 arch/openrisc/kernel/traps.c

    diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c
    new file mode 100644
    index 0000000..a4ec44a
    --- /dev/null
    +++ b/arch/openrisc/kernel/traps.c
    @@ -0,0 +1,366 @@
    +/*
    + * OpenRISC traps.c
    + *
    + * Linux architectural port borrowing liberally from similar works of
    + * others. All original copyrights apply as per the original source
    + * declaration.
    + *
    + * Modifications for the OpenRISC architecture:
    + * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
    + * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
    + *
    + * This program is free software; you can redistribute it and/or
    + * modify it under the terms of the GNU General Public License
    + * as published by the Free Software Foundation; either version
    + * 2 of the License, or (at your option) any later version.
    + *
    + * Here we handle the break vectors not used by the system call
    + * mechanism, as well as some general stack/register dumping
    + * things.
    + *
    + */
    +
    +#include <linux/init.h>
    +#include <linux/sched.h>
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/kmod.h>
    +#include <linux/string.h>
    +#include <linux/errno.h>
    +#include <linux/ptrace.h>
    +#include <linux/timer.h>
    +#include <linux/mm.h>
    +#include <linux/kallsyms.h>
    +#include <asm/uaccess.h>
    +
    +#include <asm/system.h>
    +#include <asm/segment.h>
    +#include <asm/io.h>
    +#include <asm/pgtable.h>
    +
    +extern char _etext, _stext;
    +
    +int kstack_depth_to_print = 0x180;
    +
    +static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
    +{
    + return p > (void *)tinfo && p < (void *)tinfo + THREAD_SIZE - 3;
    +}
    +
    +void show_trace(struct task_struct *task, unsigned long *stack)
    +{
    + struct thread_info *context;
    + unsigned long addr;
    +
    + context = (struct thread_info *)
    + ((unsigned long)stack & (~(THREAD_SIZE - 1)));
    +
    + while (valid_stack_ptr(context, stack)) {
    + addr = *stack++;
    + if (__kernel_text_address(addr)) {
    + printk(" [<%08lx>]", addr);
    + print_symbol(" %s", addr);
    + printk("\n");
    + }
    + }
    + printk(" =======================\n");
    +}
    +
    +/* displays a short stack trace */
    +void show_stack(struct task_struct *task, unsigned long *esp)
    +{
    + unsigned long addr, *stack;
    + int i;
    +
    + if (esp == NULL)
    + esp = (unsigned long *)&esp;
    +
    + stack = esp;
    +
    + printk("Stack dump [0x%08lx]:\n", (unsigned long)esp);
    + for (i = 0; i < kstack_depth_to_print; i++) {
    + if (kstack_end(stack))
    + break;
    + if (__get_user(addr, stack)) {
    + /* This message matches "failing address" marked
    + s390 in ksymoops, so lines containing it will
    + not be filtered out by ksymoops. */
    + printk("Failing address 0x%lx\n", (unsigned long)stack);
    + break;
    + }
    + stack++;
    +
    + printk("sp + %02d: 0x%08lx\n", i * 4, addr);
    + }
    + printk("\n");
    +
    + show_trace(task, esp);
    +
    + return;
    +}
    +
    +void show_trace_task(struct task_struct *tsk)
    +{
    + /*
    + * TODO: SysRq-T trace dump...
    + */
    +}
    +
    +/*
    + * The architecture-independent backtrace generator
    + */
    +void dump_stack(void)
    +{
    + unsigned long stack;
    +
    + show_stack(current, &stack);
    +}
    +
    +void show_registers(struct pt_regs *regs)
    +{
    + int i;
    + int in_kernel = 1;
    + unsigned long esp;
    +
    + esp = (unsigned long)(&regs->sp);
    + if (user_mode(regs))
    + in_kernel = 0;
    +
    + printk("CPU #: %d\n"
    + " PC: %08lx SR: %08lx SP: %08lx\n",
    + smp_processor_id(), regs->pc, regs->sr, regs->sp);
    + printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
    + 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
    + printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
    + regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
    + printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
    + regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
    + printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
    + regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
    + printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
    + regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
    + printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
    + regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
    + printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
    + regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
    + printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
    + regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
    + printk(" RES: %08lx oGPR11: %08lx syscallno: %08lx\n",
    + regs->gpr[11], regs->orig_gpr11, regs->syscallno);
    +
    + printk("Process %s (pid: %d, stackpage=%08lx)\n",
    + current->comm, current->pid, (unsigned long)current);
    + /*
    + * When in-kernel, we also print out the stack and code at the
    + * time of the fault..
    + */
    + if (in_kernel) {
    +
    + printk("\nStack: ");
    + show_stack(NULL, (unsigned long *)esp);
    +
    + printk("\nCode: ");
    + if (regs->pc < PAGE_OFFSET)
    + goto bad;
    +
    + for (i = -24; i < 24; i++) {
    + unsigned char c;
    + if (__get_user(c, &((unsigned char *)regs->pc)[i])) {
    +bad:
    + printk(" Bad PC value.");
    + break;
    + }
    +
    + if (i == 0)
    + printk("(%02x) ", c);
    + else
    + printk("%02x ", c);
    + }
    + }
    + printk("\n");
    +}
    +
    +void nommu_dump_state(struct pt_regs *regs,
    + unsigned long ea, unsigned long vector)
    +{
    + int i;
    + unsigned long addr, stack = regs->sp;
    +
    + printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
    +
    + printk("CPU #: %d\n"
    + " PC: %08lx SR: %08lx SP: %08lx\n",
    + 0, regs->pc, regs->sr, regs->sp);
    + printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
    + 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
    + printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
    + regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
    + printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
    + regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
    + printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
    + regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
    + printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
    + regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
    + printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
    + regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
    + printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
    + regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
    + printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
    + regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
    + printk(" RES: %08lx oGPR11: %08lx syscallno: %08lx\n",
    + regs->gpr[11], regs->orig_gpr11, regs->syscallno);
    +
    + printk("Process %s (pid: %d, stackpage=%08lx)\n",
    + ((struct task_struct *)(__pa(current)))->comm,
    + ((struct task_struct *)(__pa(current)))->pid,
    + (unsigned long)current);
    +
    + printk("\nStack: ");
    + printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
    + for (i = 0; i < kstack_depth_to_print; i++) {
    + if (((long)stack & (THREAD_SIZE - 1)) == 0)
    + break;
    + stack++;
    +
    + printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
    + *((unsigned long *)(__pa(stack))));
    + }
    + printk("\n");
    +
    + printk("Call Trace: ");
    + i = 1;
    + while (((long)stack & (THREAD_SIZE - 1)) != 0) {
    + addr = *((unsigned long *)__pa(stack));
    + stack++;
    +
    + if (kernel_text_address(addr)) {
    + if (i && ((i % 6) == 0))
    + printk("\n ");
    + printk(" [<%08lx>]", addr);
    + i++;
    + }
    + }
    + printk("\n");
    +
    + printk("\nCode: ");
    +
    + for (i = -24; i < 24; i++) {
    + unsigned char c;
    + c = ((unsigned char *)(__pa(regs->pc)))[i];
    +
    + if (i == 0)
    + printk("(%02x) ", c);
    + else
    + printk("%02x ", c);
    + }
    + printk("\n");
    +}
    +
    +/* This is normally the 'Oops' routine */
    +void die(const char *str, struct pt_regs *regs, long err)
    +{
    +
    + console_verbose();
    + printk("\n%s#: %04lx\n", str, err & 0xffff);
    + show_registers(regs);
    +#ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
    + printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
    +
    + /* shut down interrupts */
    + local_irq_disable();
    +
    + __asm__ __volatile__("l.nop 1");
    + do {} while (1);
    +#endif
    + do_exit(SIGSEGV);
    +}
    +
    +/* This is normally the 'Oops' routine */
    +void die_if_kernel(const char *str, struct pt_regs *regs, long err)
    +{
    + if (user_mode(regs))
    + return;
    +
    + die(str, regs, err);
    +}
    +
    +void unhandled_exception(struct pt_regs *regs, int ea, int vector)
    +{
    + printk("Unable to handle exception at EA =0x%x, vector 0x%x",
    + ea, vector);
    + die("Oops", regs, 9);
    +}
    +
    +void __init trap_init(void)
    +{
    + /* Nothing needs to be done */
    +}
    +
    +asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
    +{
    + siginfo_t info;
    + memset(&info, 0, sizeof(info));
    + info.si_signo = SIGTRAP;
    + info.si_code = TRAP_TRACE;
    + info.si_addr = (void *)address;
    + force_sig_info(SIGTRAP, &info, current);
    +
    + regs->pc += 4;
    +}
    +
    +asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
    +{
    + siginfo_t info;
    +
    + if (user_mode(regs)) {
    + /* Send a SIGSEGV */
    + info.si_signo = SIGSEGV;
    + info.si_errno = 0;
    + /* info.si_code has been set above */
    + info.si_addr = (void *)address;
    + force_sig_info(SIGSEGV, &info, current);
    + } else {
    + printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
    + show_registers(regs);
    + die("Die:", regs, address);
    + }
    +
    +}
    +
    +asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
    +{
    + siginfo_t info;
    +
    + if (user_mode(regs)) {
    + /* Send a SIGBUS */
    + info.si_signo = SIGBUS;
    + info.si_errno = 0;
    + info.si_code = BUS_ADRERR;
    + info.si_addr = (void *)address;
    + force_sig_info(SIGBUS, &info, current);
    + } else { /* Kernel mode */
    + printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
    + show_registers(regs);
    + die("Die:", regs, address);
    + }
    +}
    +
    +asmlinkage void do_illegal_instruction(struct pt_regs *regs,
    + unsigned long address)
    +{
    + siginfo_t info;
    +
    + if (user_mode(regs)) {
    + /* Send a SIGILL */
    + info.si_signo = SIGILL;
    + info.si_errno = 0;
    + info.si_code = ILL_ILLOPC;
    + info.si_addr = (void *)address;
    + force_sig_info(SIGBUS, &info, current);
    + } else { /* Kernel mode */
    + printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
    + address);
    + show_registers(regs);
    + die("Die:", regs, address);
    + }
    +}
    --
    1.7.4.1


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