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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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0eff9f66de
Instead of implementing our own stack unwinder via dump_trace() we should use the new stack unwinder API because it is more modular. This change allows us to decouple the interface for generating stacktraces from the implementation of a stack unwinder. Signed-off-by: Matt Fleming <matt@console-pimps.org> 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, 0);
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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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