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It unwind the stack frame based on prologue code analyze. CONFIG_KALLSYMS is needed, at least the address and length of each function. Three stages when we do unwind, 1) unwind_start(), the prapare of unwinding, fill unwind_state. 2) unwind_done(), judge whether the unwind process is finished or not. 3) unwind_next_frame(), unwind the next frame. Dividing unwinder helps to add new unwinders in the future, e.g.: unwinder_frame, unwinder_orc, .etc. Signed-off-by: Qing Zhang <zhangqing@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
29 lines
1,014 B
Text
29 lines
1,014 B
Text
choice
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prompt "Choose kernel unwinder"
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default UNWINDER_PROLOGUE if KALLSYMS
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help
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This determines which method will be used for unwinding kernel stack
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traces for panics, oopses, bugs, warnings, perf, /proc/<pid>/stack,
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lockdep, and more.
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config UNWINDER_GUESS
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bool "Guess unwinder"
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help
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This option enables the "guess" unwinder for unwinding kernel stack
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traces. It scans the stack and reports every kernel text address it
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finds. Some of the addresses it reports may be incorrect.
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While this option often produces false positives, it can still be
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useful in many cases.
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config UNWINDER_PROLOGUE
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bool "Prologue unwinder"
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depends on KALLSYMS
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help
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This option enables the "prologue" unwinder for unwinding kernel stack
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traces. It unwind the stack frame based on prologue code analyze. Symbol
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information is needed, at least the address and length of each function.
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Some of the addresses it reports may be incorrect (but better than the
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Guess unwinder).
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endchoice
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