OpenRISC: Traps

Signed-off-by: Jonas Bonn <jonas@southpole.se>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 366 insertions, 0 deletions

diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c
new file mode 100644
index 000000000000..a4ec44a052b2
--- /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);
+        }
+}