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    Subject[PATCH 1/2] microblaze: add stack unwinder
    Date
    Implement intelligent backtracing by searching for stack frame creation,
    and emitting only return addresses. Use print_hex_dump() to display the
    entire binary kernel stack.

    Limitation: MMU kernels are not currently able to trace beyond a system trap
    (interrupt, syscall, etc.). It is the intent of this patch to provide
    infrastructure that can be extended to add this capability later.

    Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
    ---
    diff -uprN a/arch/microblaze/include/asm/exceptions.h b/arch/microblaze/include/asm/exceptions.h
    --- a/arch/microblaze/include/asm/exceptions.h 2010-04-09 21:52:36.000000000 -0500
    +++ b/arch/microblaze/include/asm/exceptions.h 2010-04-12 22:21:01.000000000 -0500
    @@ -14,6 +14,11 @@
    #define _ASM_MICROBLAZE_EXCEPTIONS_H

    #ifdef __KERNEL__
    +
    +#ifndef CONFIG_MMU
    +#define EX_HANDLER_STACK_SIZ (4*19)
    +#endif
    +
    #ifndef __ASSEMBLY__

    /* Macros to enable and disable HW exceptions in the MSR */
    diff -uprN a/arch/microblaze/include/asm/system.h b/arch/microblaze/include/asm/system.h
    --- a/arch/microblaze/include/asm/system.h 2010-04-09 21:52:36.000000000 -0500
    +++ b/arch/microblaze/include/asm/system.h 2010-04-12 22:16:01.000000000 -0500
    @@ -44,7 +44,6 @@ extern struct task_struct *_switch_to(st
    #define smp_rmb() rmb()
    #define smp_wmb() wmb()

    -void show_trace(struct task_struct *task, unsigned long *stack);
    void __bad_xchg(volatile void *ptr, int size);

    static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
    diff -uprN a/arch/microblaze/kernel/entry-nommu.S b/arch/microblaze/kernel/entry-nommu.S
    --- a/arch/microblaze/kernel/entry-nommu.S 2010-04-09 21:52:36.000000000 -0500
    +++ b/arch/microblaze/kernel/entry-nommu.S 2010-04-12 22:16:01.000000000 -0500
    @@ -586,3 +586,31 @@ sys_rt_sigsuspend_wrapper:
    #include "syscall_table.S"

    syscall_table_size=(.-sys_call_table)
    +
    +type_SYSCALL:
    + .ascii "SYSCALL\0"
    +type_IRQ:
    + .ascii "IRQ\0"
    +type_IRQ_PREEMPT:
    + .ascii "IRQ (PREEMPTED)\0"
    +type_SYSCALL_PREEMPT:
    + .ascii " SYSCALL (PREEMPTED)\0"
    +
    + /*
    + * Trap decoding for stack unwinder
    + * Tuples are (start addr, end addr, string)
    + * If return address lies on [start addr, end addr],
    + * unwinder displays 'string'
    + */
    +
    + .align 4
    +.global microblaze_trap_handlers
    +microblaze_trap_handlers:
    + /* Exact matches come first */
    + .word ret_to_user ; .word ret_to_user ; .word type_SYSCALL
    + .word ret_from_intr; .word ret_from_intr ; .word type_IRQ
    + /* Fuzzy matches go here */
    + .word ret_from_intr; .word no_intr_resched; .word type_IRQ_PREEMPT
    + .word work_pending ; .word no_work_pending; .word type_SYSCALL_PREEMPT
    + /* End of table */
    + .word 0 ; .word 0 ; .word 0
    diff -uprN a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S
    --- a/arch/microblaze/kernel/entry.S 2010-04-09 21:52:36.000000000 -0500
    +++ b/arch/microblaze/kernel/entry.S 2010-04-12 22:16:01.000000000 -0500
    @@ -1127,3 +1127,30 @@ ENTRY(_break)

    syscall_table_size=(.-sys_call_table)

    +type_SYSCALL:
    + .ascii "SYSCALL\0"
    +type_IRQ:
    + .ascii "IRQ\0"
    +type_IRQ_PREEMPT:
    + .ascii "IRQ (PREEMPTED)\0"
    +type_SYSCALL_PREEMPT:
    + .ascii " SYSCALL (PREEMPTED)\0"
    +
    + /*
    + * Trap decoding for stack unwinder
    + * Tuples are (start addr, end addr, string)
    + * If return address lies on [start addr, end addr],
    + * unwinder displays 'string'
    + */
    +
    + .align 4
    +.global microblaze_trap_handlers
    +microblaze_trap_handlers:
    + /* Exact matches come first */
    + .word ret_from_trap; .word ret_from_trap ; .word type_SYSCALL
    + .word ret_from_irq ; .word ret_from_irq ; .word type_IRQ
    + /* Fuzzy matches go here */
    + .word ret_from_irq ; .word no_intr_resched ; .word type_IRQ_PREEMPT
    + .word ret_from_trap; .word TRAP_return ; .word type_SYSCALL_PREEMPT
    + /* End of table */
    + .word 0 ; .word 0 ; .word 0
    diff -uprN a/arch/microblaze/kernel/hw_exception_handler.S b/arch/microblaze/kernel/hw_exception_handler.S
    --- a/arch/microblaze/kernel/hw_exception_handler.S 2010-04-09 21:52:36.000000000 -0500
    +++ b/arch/microblaze/kernel/hw_exception_handler.S 2010-04-12 22:21:15.000000000 -0500
    @@ -78,9 +78,6 @@
    #include <asm/asm-offsets.h>

    /* Helpful Macros */
    -#ifndef CONFIG_MMU
    -#define EX_HANDLER_STACK_SIZ (4*19)
    -#endif
    #define NUM_TO_REG(num) r ## num

    #ifdef CONFIG_MMU
    @@ -988,6 +985,7 @@ ex_unaligned_fixup:
    .end _unaligned_data_exception
    #endif /* CONFIG_MMU */

    +.global ex_handler_unhandled
    ex_handler_unhandled:
    /* FIXME add handle function for unhandled exception - dump register */
    bri 0
    diff -uprN a/arch/microblaze/kernel/Makefile b/arch/microblaze/kernel/Makefile
    --- a/arch/microblaze/kernel/Makefile 2010-04-09 21:52:36.000000000 -0500
    +++ b/arch/microblaze/kernel/Makefile 2010-04-12 22:16:01.000000000 -0500
    @@ -17,7 +17,8 @@ extra-y := head.o vmlinux.lds
    obj-y += dma.o exceptions.o \
    hw_exception_handler.o init_task.o intc.o irq.o of_device.o \
    of_platform.o process.o prom.o prom_parse.o ptrace.o \
    - setup.o signal.o sys_microblaze.o timer.o traps.o reset.o
    + setup.o signal.o sys_microblaze.o timer.o traps.o reset.o \
    + unwind.o

    obj-y += cpu/

    diff -uprN a/arch/microblaze/kernel/stacktrace.c b/arch/microblaze/kernel/stacktrace.c
    --- a/arch/microblaze/kernel/stacktrace.c 2010-04-09 21:52:36.000000000 -0500
    +++ b/arch/microblaze/kernel/stacktrace.c 2010-04-12 22:16:01.000000000 -0500
    @@ -14,52 +14,18 @@
    #include <linux/thread_info.h>
    #include <linux/ptrace.h>
    #include <linux/module.h>
    +#include "unwind.h"

    -/* FIXME initial support */
    void save_stack_trace(struct stack_trace *trace)
    {
    - unsigned long *sp;
    - unsigned long addr;
    - asm("addik %0, r1, 0" : "=r" (sp));
    -
    - while (!kstack_end(sp)) {
    - addr = *sp++;
    - if (__kernel_text_address(addr)) {
    - if (trace->skip > 0)
    - trace->skip--;
    - else
    - trace->entries[trace->nr_entries++] = addr;
    -
    - if (trace->nr_entries >= trace->max_entries)
    - break;
    - }
    - }
    + /* Exclude our helper functions from the trace*/
    + trace->skip += 2;
    + microblaze_unwind(NULL, trace);
    }
    EXPORT_SYMBOL_GPL(save_stack_trace);

    void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
    {
    - unsigned int *sp;
    - unsigned long addr;
    -
    - struct thread_info *ti = task_thread_info(tsk);
    -
    - if (tsk == current)
    - asm("addik %0, r1, 0" : "=r" (sp));
    - else
    - sp = (unsigned int *)ti->cpu_context.r1;
    -
    - while (!kstack_end(sp)) {
    - addr = *sp++;
    - if (__kernel_text_address(addr)) {
    - if (trace->skip > 0)
    - trace->skip--;
    - else
    - trace->entries[trace->nr_entries++] = addr;
    -
    - if (trace->nr_entries >= trace->max_entries)
    - break;
    - }
    - }
    + microblaze_unwind(tsk, trace);
    }
    EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
    diff -uprN a/arch/microblaze/kernel/traps.c b/arch/microblaze/kernel/traps.c
    --- a/arch/microblaze/kernel/traps.c 2010-04-09 21:52:36.000000000 -0500
    +++ b/arch/microblaze/kernel/traps.c 2010-04-12 22:16:01.000000000 -0500
    @@ -13,16 +13,19 @@
    #include <linux/module.h>
    #include <linux/sched.h>
    #include <linux/debug_locks.h>
    +#include <linux/seq_file.h>

    #include <asm/exceptions.h>
    #include <asm/system.h>

    +#include "unwind.h"
    +
    void trap_init(void)
    {
    __enable_hw_exceptions();
    }

    -static unsigned long kstack_depth_to_print = 24;
    +static unsigned long kstack_depth_to_print; /* 0 == entire stack */

    static int __init kstack_setup(char *s)
    {
    @@ -30,31 +33,42 @@ static int __init kstack_setup(char *s)
    }
    __setup("kstack=", kstack_setup);

    -void show_trace(struct task_struct *task, unsigned long *stack)
    +void show_stack(struct task_struct *task, unsigned long *sp)
    {
    - unsigned long addr;
    + unsigned long words_to_show;
    + __u32 fp = (__u32) sp;

    - if (!stack)
    - stack = (unsigned long *)&stack;
    + if (fp == 0) {
    + if (task)
    + fp = ((struct thread_info *)
    + (task->stack))->cpu_context.r1;
    + else {
    + /* Pick up caller of dump_stack() */
    + fp = (__u32)&sp - 8;
    + }
    + }

    - printk(KERN_NOTICE "Call Trace: ");
    -#ifdef CONFIG_KALLSYMS
    - printk(KERN_NOTICE "\n");
    -#endif
    - while (!kstack_end(stack)) {
    - addr = *stack++;
    - /*
    - * If the address is either in the text segment of the
    - * kernel, or in the region which contains vmalloc'ed
    - * memory, it *may* be the address of a calling
    - * routine; if so, print it so that someone tracing
    - * down the cause of the crash will be able to figure
    - * out the call path that was taken.
    - */
    - if (kernel_text_address(addr))
    - print_ip_sym(addr);
    + words_to_show = (THREAD_SIZE - (fp & (THREAD_SIZE-1))) >> 2;
    + if (kstack_depth_to_print && (words_to_show > kstack_depth_to_print))
    + words_to_show = kstack_depth_to_print;
    +
    + pr_info("Stack:\n");
    + if (fp & 0xF) {
    + unsigned long line1_words = (0x10 - (fp & 0xF)) >> 2;
    + if (line1_words < words_to_show) {
    + print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32,
    + 4, (void *)fp, line1_words << 2, 0);
    + fp += line1_words << 2;
    + words_to_show -= line1_words;
    + }
    }
    - printk(KERN_NOTICE "\n");
    + print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp,
    + words_to_show << 2, 0);
    + printk(KERN_INFO "\n\n");
    +
    + pr_info("Call Trace:\n");
    + microblaze_unwind(task, NULL);
    + pr_info("\n");

    if (!task)
    task = current;
    @@ -62,34 +76,6 @@ void show_trace(struct task_struct *task
    debug_show_held_locks(task);
    }

    -void show_stack(struct task_struct *task, unsigned long *sp)
    -{
    - unsigned long *stack;
    - int i;
    -
    - if (sp == NULL) {
    - if (task)
    - sp = (unsigned long *) ((struct thread_info *)
    - (task->stack))->cpu_context.r1;
    - else
    - sp = (unsigned long *)&sp;
    - }
    -
    - stack = sp;
    -
    - printk(KERN_INFO "\nStack:\n ");
    -
    - for (i = 0; i < kstack_depth_to_print; i++) {
    - if (kstack_end(sp))
    - break;
    - if (i && ((i % 8) == 0))
    - printk("\n ");
    - printk("%08lx ", *sp++);
    - }
    - printk("\n");
    - show_trace(task, stack);
    -}
    -
    void dump_stack(void)
    {
    show_stack(NULL, NULL);
    @@ -129,3 +115,4 @@ int debug_trap(struct pt_regs *regs)
    return -ENOSYS;
    }
    #endif
    +
    diff -uprN a/arch/microblaze/kernel/unwind.c b/arch/microblaze/kernel/unwind.c
    --- a/arch/microblaze/kernel/unwind.c 1969-12-31 18:00:00.000000000 -0600
    +++ b/arch/microblaze/kernel/unwind.c 2010-04-12 22:16:01.000000000 -0500
    @@ -0,0 +1,316 @@
    +/*
    + * Backtrace support for Microblaze
    + *
    + * Copyright (C) 2010 Digital Design Corporation
    + *
    + * Based on arch/sh/kernel/cpu/sh5/unwind.c code which is:
    + * Copyright (C) 2004 Paul Mundt
    + * Copyright (C) 2004 Richard Curnow
    + *
    + * This file is subject to the terms and conditions of the GNU General Public
    + * License. See the file "COPYING" in the main directory of this archive
    + * for more details.
    + */
    +
    +/* #define DEBUG 1 */
    +#include <linux/kallsyms.h>
    +#include <linux/kernel.h>
    +#include <linux/sched.h>
    +#include <linux/stacktrace.h>
    +#include <linux/types.h>
    +#include <linux/errno.h>
    +#include <linux/module.h>
    +#include <linux/io.h>
    +#include <asm/sections.h>
    +#include <asm/exceptions.h>
    +#include "unwind.h"
    +
    +struct stack_trace;
    +
    +/*
    + * On Microblaze, finding the previous stack frame is a little tricky.
    + * At this writing (3/2010), Microblaze does not support CONFIG_FRAME_POINTERS,
    + * and even if it did, gcc (4.1.2) does not store the frame pointer at
    + * a consistent offset within each frame. To determine frame size, it is
    + * necessary to search for the assembly instruction that creates the frame
    + * and extract the size from it.
    + *
    + * Microblaze stores the stack pointer in r1, and creates a frame via
    + *
    + * addik r1, r1, -FRAME_SIZE
    + *
    + * A stack frame is usually not created in a leaf function.
    + *
    + */
    +
    +/**
    + * get_frame_size - Extract the stack adjustment from an
    + * "addik r1, r1, -adjust" instruction
    + * @instr : Microblaze instruction
    + *
    + * Return - Number of bytes the instruction reserves for a stack frame
    + */
    +inline s16 get_frame_size(unsigned long instr)
    +{
    + return -(s16)(instr & 0xFFFF);
    +}
    +
    +/**
    + * find_frame_creation - Search backward to find the instruction that creates
    + * the stack frame (hopefully, for the same function the
    + * initial PC is in).
    + * @pc : Program counter at which to begin the search
    + *
    + * Return - PC at which stack frame creation occurs
    + * NULL if this cannot be found, i.e. a leaf function
    + */
    +static unsigned long *find_frame_creation(unsigned long *pc)
    +{
    + int i;
    +
    + /* NOTE: Distance to search is arbitrary
    + * 250 works well for most things,
    + * 750 picks up things like tcp_recvmsg(),
    + * 1000 needed for fat_fill_super()
    + */
    + for (i = 0; i < 1000; i++, pc--) {
    + unsigned long instr;
    + s16 frame_size;
    +
    + if (!kernel_text_address((unsigned long) pc))
    + return NULL;
    +
    + instr = *pc;
    +
    + /*
    + * rtsd of some sort,
    + * i.e., a return from a previous function?
    + */
    + if ((instr & 0xFFE00000) == 0xb6000000)
    + return NULL;
    +
    + if ((instr & 0xFFFF0000) != 0x30210000) /* addik r1, r1 */
    + continue;
    +
    + frame_size = get_frame_size(instr);
    + if ((frame_size < 8) || (frame_size & 3)) {
    + pr_debug(" Invalid frame size %d at 0x%p\n",
    + frame_size, pc);
    + return NULL;
    + }
    +
    + pr_debug(" Found frame creation at 0x%p, size %d\n", pc,
    + frame_size);
    + return pc;
    + }
    +
    + return NULL;
    +}
    +
    +/**
    + * lookup_prev_stack_frame - Find the stack frame of the previous function.
    + * @fp : Frame (stack) pointer for current function
    + * @pc : Program counter within current function
    + * @leaf_return : r15 value within current function. If the current function
    + * is a leaf, this is the caller's return address.
    + * @pprev_fp : On exit, set to frame (stack) pointer for previous function
    + * @pprev_pc : On exit, set to current function caller's return address
    + *
    + * Return - 0 on success, -EINVAL if the previous frame cannot be found
    + */
    +static int lookup_prev_stack_frame(unsigned long fp, unsigned long pc,
    + unsigned long leaf_return,
    + unsigned long *pprev_fp,
    + unsigned long *pprev_pc)
    +{
    + unsigned long *prologue = NULL;
    +
    + /* _switch_to is a special leaf function */
    + if (pc != (unsigned long) &_switch_to)
    + prologue = find_frame_creation((unsigned long *)pc);
    +
    + if (prologue) {
    + s16 frame_size = get_frame_size(*prologue);
    +
    + *pprev_fp = fp + frame_size;
    + *pprev_pc = *(unsigned long *)fp;
    + } else {
    + if (!leaf_return)
    + return -EINVAL;
    + *pprev_pc = leaf_return;
    + *pprev_fp = fp;
    + }
    +
    + /* NOTE: don't check kernel_text_address here, to allow display
    + * of userland return address
    + */
    + return (!*pprev_pc || (*pprev_pc & 3)) ? -EINVAL : 0;
    +}
    +
    +static void microblaze_unwind_inner(struct task_struct *task,
    + unsigned long pc, unsigned long fp,
    + unsigned long leaf_return,
    + struct stack_trace *trace);
    +
    +/**
    + * unwind_trap - Unwind through a system trap, that stored previous state
    + * on the stack.
    + */
    +#ifdef CONFIG_MMU
    +static inline void unwind_trap(struct task_struct *task, unsigned long pc,
    + unsigned long fp, struct stack_trace *trace)
    +{
    + /* To be implemented */
    +}
    +#else
    +static inline void unwind_trap(struct task_struct *task, unsigned long pc,
    + unsigned long fp, struct stack_trace *trace)
    +{
    + const struct pt_regs *regs = (const struct pt_regs *) fp;
    + microblaze_unwind_inner(task, regs->pc, regs->r1, regs->r15, trace);
    +}
    +#endif
    +
    +/**
    + * microblaze_unwind_inner - Unwind the stack from the specified point
    + * @task : Task whose stack we are to unwind (may be NULL)
    + * @pc : Program counter from which we start unwinding
    + * @fp : Frame (stack) pointer from which we start unwinding
    + * @leaf_return : Value of r15 at pc. If the function is a leaf, this is
    + * the caller's return address.
    + * @trace : Where to store stack backtrace (PC values).
    + * NULL == print backtrace to kernel log
    + */
    +void microblaze_unwind_inner(struct task_struct *task,
    + unsigned long pc, unsigned long fp,
    + unsigned long leaf_return,
    + struct stack_trace *trace)
    +{
    + int ofs = 0;
    +
    + pr_debug(" Unwinding with PC=%p, FP=%p\n", (void *)pc, (void *)fp);
    + if (!pc || !fp || (pc & 3) || (fp & 3)) {
    + pr_debug(" Invalid state for unwind, aborting\n");
    + return;
    + }
    + for (; pc != 0;) {
    + unsigned long next_fp, next_pc = 0;
    + unsigned long return_to = pc + 2 * sizeof(unsigned long);
    + const struct trap_handler_info *handler =
    + &microblaze_trap_handlers;
    +
    + /* Is previous function the HW exception handler? */
    + if ((return_to >= (unsigned long)&_hw_exception_handler)
    + &&(return_to < (unsigned long)&ex_handler_unhandled)) {
    + /*
    + * HW exception handler doesn't save all registers,
    + * so we open-code a special case of unwind_trap()
    + */
    +#ifndef CONFIG_MMU
    + const struct pt_regs *regs =
    + (const struct pt_regs *) fp;
    +#endif
    + pr_info("HW EXCEPTION\n");
    +#ifndef CONFIG_MMU
    + microblaze_unwind_inner(task, regs->r17 - 4,
    + fp + EX_HANDLER_STACK_SIZ,
    + regs->r15, trace);
    +#endif
    + return;
    + }
    +
    + /* Is previous function a trap handler? */
    + for (; handler->start_addr; ++handler) {
    + if ((return_to >= handler->start_addr)
    + && (return_to <= handler->end_addr)) {
    + if (!trace)
    + pr_info("%s\n", handler->trap_name);
    + unwind_trap(task, pc, fp, trace);
    + return;
    + }
    + }
    + pc -= ofs;
    +
    + if (trace) {
    +#ifdef CONFIG_STACKTRACE
    + if (trace->skip > 0)
    + trace->skip--;
    + else
    + trace->entries[trace->nr_entries++] = pc;
    +
    + if (trace->nr_entries >= trace->max_entries)
    + break;
    +#endif
    + } else {
    + /* Have we reached userland? */
    + if (unlikely(pc == task_pt_regs(task)->pc)) {
    + pr_info("[<%p>] PID %lu [%s]\n",
    + (void *) pc,
    + (unsigned long) task->pid,
    + task->comm);
    + break;
    + } else
    + print_ip_sym(pc);
    + }
    +
    + /* Stop when we reach anything not part of the kernel */
    + if (!kernel_text_address(pc))
    + break;
    +
    + if (lookup_prev_stack_frame(fp, pc, leaf_return, &next_fp,
    + &next_pc) == 0) {
    + ofs = sizeof(unsigned long);
    + pc = next_pc & ~3;
    + fp = next_fp;
    + leaf_return = 0;
    + } else {
    + pr_debug(" Failed to find previous stack frame\n");
    + break;
    + }
    +
    + pr_debug(" Next PC=%p, next FP=%p\n",
    + (void *)next_pc, (void *)next_fp);
    + }
    +}
    +
    +/**
    + * microblaze_unwind - Stack unwinder for Microblaze (external entry point)
    + * @task : Task whose stack we are to unwind (NULL == current)
    + * @trace : Where to store stack backtrace (PC values).
    + * NULL == print backtrace to kernel log
    + */
    +void microblaze_unwind(struct task_struct *task, struct stack_trace *trace)
    +{
    + if (task) {
    + if (task == current) {
    + const struct pt_regs *regs = task_pt_regs(task);
    + microblaze_unwind_inner(task, regs->pc, regs->r1,
    + regs->r15, trace);
    + } else {
    + struct thread_info *thread_info =
    + (struct thread_info *)(task->stack);
    + const struct cpu_context *cpu_context =
    + &thread_info->cpu_context;
    +
    + microblaze_unwind_inner(task,
    + (unsigned long) &_switch_to,
    + cpu_context->r1,
    + cpu_context->r15, trace);
    + }
    + } else {
    + unsigned long pc, fp;
    +
    + __asm__ __volatile__ ("or %0, r1, r0" : "=r" (fp));
    +
    + __asm__ __volatile__ (
    + "brlid %0, 0f;"
    + "nop;"
    + "0:"
    + : "=r" (pc)
    + );
    +
    + /* Since we are not a leaf function, use leaf_return = 0 */
    + microblaze_unwind_inner(current, pc, fp, 0, trace);
    + }
    +}
    +
    diff -uprN a/arch/microblaze/kernel/unwind.h b/arch/microblaze/kernel/unwind.h
    --- a/arch/microblaze/kernel/unwind.h 1969-12-31 18:00:00.000000000 -0600
    +++ b/arch/microblaze/kernel/unwind.h 2010-04-12 22:16:01.000000000 -0500
    @@ -0,0 +1,29 @@
    +/*
    + * Backtrace support for Microblaze
    + *
    + * Copyright (C) 2010 Digital Design Corporation
    + *
    + * This file is subject to the terms and conditions of the GNU General Public
    + * License. See the file "COPYING" in the main directory of this archive
    + * for more details.
    + */
    +
    +#ifndef __MICROBLAZE_UNWIND_H
    +#define __MICROBLAZE_UNWIND_H
    +
    +struct stack_trace;
    +
    +struct trap_handler_info {
    + unsigned long start_addr;
    + unsigned long end_addr;
    + const char *trap_name;
    +};
    +extern struct trap_handler_info microblaze_trap_handlers;
    +
    +extern const char _hw_exception_handler;
    +extern const char ex_handler_unhandled;
    +
    +void microblaze_unwind(struct task_struct *task, struct stack_trace *trace);
    +
    +#endif /* __MICROBLAZE_UNWIND_H */
    +



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