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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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