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76 lines
1.5 KiB
76 lines
1.5 KiB
#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/stacktrace.h>
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#include <asm/stacktrace.h>
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void walk_stackframe(unsigned long sp,
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int (*fn)(unsigned long addr, void *data),
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void *data)
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{
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unsigned long high = ALIGN(sp, THREAD_SIZE);
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for (; sp <= high - 4; sp += 4) {
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unsigned long addr = *(unsigned long *) sp;
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if (!kernel_text_address(addr))
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continue;
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if (fn(addr, data))
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break;
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}
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}
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struct stack_trace_data {
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struct stack_trace *trace;
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unsigned int no_sched_functions;
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unsigned int skip;
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};
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#ifdef CONFIG_STACKTRACE
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static int save_trace(unsigned long addr, void *d)
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{
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struct stack_trace_data *data = d;
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struct stack_trace *trace = data->trace;
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if (data->no_sched_functions && in_sched_functions(addr))
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return 0;
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if (data->skip) {
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data->skip--;
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return 0;
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}
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trace->entries[trace->nr_entries++] = addr;
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return trace->nr_entries >= trace->max_entries;
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}
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void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
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{
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struct stack_trace_data data;
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unsigned long sp;
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data.trace = trace;
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data.skip = trace->skip;
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if (tsk != current) {
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data.no_sched_functions = 1;
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sp = tsk->thread.ksp;
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} else {
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data.no_sched_functions = 0;
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sp = rdsp();
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}
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walk_stackframe(sp, save_trace, &data);
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if (trace->nr_entries < trace->max_entries)
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trace->entries[trace->nr_entries++] = ULONG_MAX;
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}
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void save_stack_trace(struct stack_trace *trace)
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{
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save_stack_trace_tsk(current, trace);
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}
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EXPORT_SYMBOL_GPL(save_stack_trace);
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#endif /* CONFIG_STACKTRACE */
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