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8b5e99f022
The unwinder warnings are good at finding unexpected unwinder issues, but they often don't give enough data to be able to fully diagnose them. Print a one-time stack dump when a warning is detected. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Andy Lutomirski <luto@amacapital.net> Link: http://lkml.kernel.org/r/15607370e3ddb1732b6a73d5c65937864df16ac8.1481904011.git.jpoimboe@redhat.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
#ifndef _ASM_X86_UNWIND_H
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#define _ASM_X86_UNWIND_H
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#include <linux/sched.h>
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#include <linux/ftrace.h>
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#include <asm/ptrace.h>
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#include <asm/stacktrace.h>
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struct unwind_state {
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struct stack_info stack_info;
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unsigned long stack_mask;
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struct task_struct *task;
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int graph_idx;
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#ifdef CONFIG_FRAME_POINTER
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unsigned long *bp, *orig_sp;
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struct pt_regs *regs;
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#else
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unsigned long *sp;
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#endif
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};
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void __unwind_start(struct unwind_state *state, struct task_struct *task,
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struct pt_regs *regs, unsigned long *first_frame);
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bool unwind_next_frame(struct unwind_state *state);
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unsigned long unwind_get_return_address(struct unwind_state *state);
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static inline bool unwind_done(struct unwind_state *state)
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{
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return state->stack_info.type == STACK_TYPE_UNKNOWN;
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}
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static inline
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void unwind_start(struct unwind_state *state, struct task_struct *task,
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struct pt_regs *regs, unsigned long *first_frame)
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{
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first_frame = first_frame ? : get_stack_pointer(task, regs);
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__unwind_start(state, task, regs, first_frame);
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}
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#ifdef CONFIG_FRAME_POINTER
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static inline
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unsigned long *unwind_get_return_address_ptr(struct unwind_state *state)
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{
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if (unwind_done(state))
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return NULL;
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return state->regs ? &state->regs->ip : state->bp + 1;
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}
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static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
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{
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if (unwind_done(state))
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return NULL;
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return state->regs;
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}
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#else /* !CONFIG_FRAME_POINTER */
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static inline
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unsigned long *unwind_get_return_address_ptr(struct unwind_state *state)
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{
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return NULL;
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}
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static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
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{
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return NULL;
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}
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#endif /* CONFIG_FRAME_POINTER */
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#endif /* _ASM_X86_UNWIND_H */
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