LXR linux/arch/sh/kernel/dumpstack.c

   1/*
   2 *  Copyright (C) 1991, 1992  Linus Torvalds
   3 *  Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
   4 *  Copyright (C) 2009  Matt Fleming
   5 *  Copyright (C) 2002 - 2012  Paul Mundt
   6 *
   7 * This file is subject to the terms and conditions of the GNU General Public
   8 * License.  See the file "COPYING" in the main directory of this archive
   9 * for more details.
  10 */
  11#include <linux/kallsyms.h>
  12#include <linux/ftrace.h>
  13#include <linux/debug_locks.h>
  14#include <linux/kdebug.h>
  15#include <linux/export.h>
  16#include <linux/uaccess.h>
  17#include <asm/unwinder.h>
  18#include <asm/stacktrace.h>
  19
  20void dump_mem(const char *str, unsigned long bottom, unsigned long top)
  21{
  22        unsigned long p;
  23        int i;
  24
  25        printk("%s(0x%08lx to 0x%08lx)\n", str, bottom, top);
  26
  27        for (p = bottom & ~31; p < top; ) {
  28                printk("%04lx: ", p & 0xffff);
  29
  30                for (i = 0; i < 8; i++, p += 4) {
  31                        unsigned int val;
  32
  33                        if (p < bottom || p >= top)
  34                                printk("         ");
  35                        else {
  36                                if (__get_user(val, (unsigned int __user *)p)) {
  37                                        printk("\n");
  38                                        return;
  39                                }
  40                                printk("%08x ", val);
  41                        }
  42                }
  43                printk("\n");
  44        }
  45}
  46
  47void printk_address(unsigned long address, int reliable)
  48{
  49        printk(" [<%p>] %s%pS\n", (void *) address,
  50                        reliable ? "" : "? ", (void *) address);
  51}
  52
  53#ifdef CONFIG_FUNCTION_GRAPH_TRACER
  54static void
  55print_ftrace_graph_addr(unsigned long addr, void *data,
  56                        const struct stacktrace_ops *ops,
  57                        struct thread_info *tinfo, int *graph)
  58{
  59        struct task_struct *task = tinfo->task;
  60        unsigned long ret_addr;
  61        int index = task->curr_ret_stack;
  62
  63        if (addr != (unsigned long)return_to_handler)
  64                return;
  65
  66        if (!task->ret_stack || index < *graph)
  67                return;
  68
  69        index -= *graph;
  70        ret_addr = task->ret_stack[index].ret;
  71
  72        ops->address(data, ret_addr, 1);
  73
  74        (*graph)++;
  75}
  76#else
  77static inline void
  78print_ftrace_graph_addr(unsigned long addr, void *data,
  79                        const struct stacktrace_ops *ops,
  80                        struct thread_info *tinfo, int *graph)
  81{ }
  82#endif
  83
  84void
  85stack_reader_dump(struct task_struct *task, struct pt_regs *regs,
  86                  unsigned long *sp, const struct stacktrace_ops *ops,
  87                  void *data)
  88{
  89        struct thread_info *context;
  90        int graph = 0;
  91
  92        context = (struct thread_info *)
  93                ((unsigned long)sp & (~(THREAD_SIZE - 1)));
  94
  95        while (!kstack_end(sp)) {
  96                unsigned long addr = *sp++;
  97
  98                if (__kernel_text_address(addr)) {
  99                        ops->address(data, addr, 1);
 100
 101                        print_ftrace_graph_addr(addr, data, ops,
 102                                                context, &graph);
 103                }
 104        }
 105}
 106
 107static int print_trace_stack(void *data, char *name)
 108{
 109        printk("%s <%s> ", (char *)data, name);
 110        return 0;
 111}
 112
 113/*
 114 * Print one address/symbol entries per line.
 115 */
 116static void print_trace_address(void *data, unsigned long addr, int reliable)
 117{
 118        printk("%s", (char *)data);
 119        printk_address(addr, reliable);
 120}
 121
 122static const struct stacktrace_ops print_trace_ops = {
 123        .stack = print_trace_stack,
 124        .address = print_trace_address,
 125};
 126
 127void show_trace(struct task_struct *tsk, unsigned long *sp,
 128                struct pt_regs *regs)
 129{
 130        if (regs && user_mode(regs))
 131                return;
 132
 133        printk("\nCall trace:\n");
 134
 135        unwind_stack(tsk, regs, sp, &print_trace_ops, "");
 136
 137        printk("\n");
 138
 139        if (!tsk)
 140                tsk = current;
 141
 142        debug_show_held_locks(tsk);
 143}
 144
 145void show_stack(struct task_struct *tsk, unsigned long *sp)
 146{
 147        unsigned long stack;
 148
 149        if (!tsk)
 150                tsk = current;
 151        if (tsk == current)
 152                sp = (unsigned long *)current_stack_pointer;
 153        else
 154                sp = (unsigned long *)tsk->thread.sp;
 155
 156        stack = (unsigned long)sp;
 157        dump_mem("Stack: ", stack, THREAD_SIZE +
 158                 (unsigned long)task_stack_page(tsk));
 159        show_trace(tsk, sp, NULL);
 160}
 161