f9967e23c1
This flags the default unwinder as reliable, as it tends to be reliable enough for the purposes of the stacktrace buffer. We leave the unreliable cases for the unwind methods that we know to be completely broken. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
124 lines
2.6 KiB
C
124 lines
2.6 KiB
C
/*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
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* Copyright (C) 2009 Matt Fleming
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*/
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#include <linux/kallsyms.h>
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#include <linux/ftrace.h>
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#include <linux/debug_locks.h>
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#include <asm/unwinder.h>
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#include <asm/stacktrace.h>
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void printk_address(unsigned long address, int reliable)
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{
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printk(" [<%p>] %s%pS\n", (void *) address,
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reliable ? "" : "? ", (void *) address);
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}
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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static void
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print_ftrace_graph_addr(unsigned long addr, void *data,
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const struct stacktrace_ops *ops,
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struct thread_info *tinfo, int *graph)
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{
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struct task_struct *task = tinfo->task;
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unsigned long ret_addr;
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int index = task->curr_ret_stack;
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if (addr != (unsigned long)return_to_handler)
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return;
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if (!task->ret_stack || index < *graph)
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return;
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index -= *graph;
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ret_addr = task->ret_stack[index].ret;
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ops->address(data, ret_addr, 1);
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(*graph)++;
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}
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#else
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static inline void
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print_ftrace_graph_addr(unsigned long addr, void *data,
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const struct stacktrace_ops *ops,
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struct thread_info *tinfo, int *graph)
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{ }
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#endif
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void
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stack_reader_dump(struct task_struct *task, struct pt_regs *regs,
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unsigned long *sp, const struct stacktrace_ops *ops,
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void *data)
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{
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struct thread_info *context;
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int graph = 0;
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context = (struct thread_info *)
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((unsigned long)sp & (~(THREAD_SIZE - 1)));
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while (!kstack_end(sp)) {
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unsigned long addr = *sp++;
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if (__kernel_text_address(addr)) {
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ops->address(data, addr, 1);
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print_ftrace_graph_addr(addr, data, ops,
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context, &graph);
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}
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}
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}
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static void
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print_trace_warning_symbol(void *data, char *msg, unsigned long symbol)
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{
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printk(data);
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print_symbol(msg, symbol);
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printk("\n");
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}
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static void print_trace_warning(void *data, char *msg)
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{
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printk("%s%s\n", (char *)data, msg);
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}
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static int print_trace_stack(void *data, char *name)
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{
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printk("%s <%s> ", (char *)data, name);
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return 0;
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}
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/*
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* Print one address/symbol entries per line.
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*/
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static void print_trace_address(void *data, unsigned long addr, int reliable)
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{
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printk(data);
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printk_address(addr, reliable);
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}
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static const struct stacktrace_ops print_trace_ops = {
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.warning = print_trace_warning,
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.warning_symbol = print_trace_warning_symbol,
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.stack = print_trace_stack,
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.address = print_trace_address,
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};
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void show_trace(struct task_struct *tsk, unsigned long *sp,
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struct pt_regs *regs)
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{
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if (regs && user_mode(regs))
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return;
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printk("\nCall trace:\n");
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unwind_stack(tsk, regs, sp, &print_trace_ops, "");
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printk("\n");
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if (!tsk)
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tsk = current;
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debug_show_held_locks(tsk);
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}
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