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Jiri Olsa
4018994f3d
Introducing PERF_SAMPLE_REGS_USER sample type bit to trigger the dump of user level registers on sample. Registers we want to dump are specified by sample_regs_user bitmask. Only user level registers are dumped at the moment. Meaning the register values of the user space context as it was before the user entered the kernel for whatever reason (syscall, irq, exception, or a PMI happening in userspace). The layout of the sample_regs_user bitmap is described in asm/perf_regs.h for archs that support register dump. This is going to be useful to bring Dwarf CFI based stack unwinding on top of samples. Original-patch-by: Frederic Weisbecker <[email protected]> [ Dump registers ABI specification. ] Signed-off-by: Jiri Olsa <[email protected]> Suggested-by: Stephane Eranian <[email protected]> Cc: "Frank Ch. Eigler" <[email protected]> Cc: Arun Sharma <[email protected]> Cc: Benjamin Redelings <[email protected]> Cc: Corey Ashford <[email protected]> Cc: Cyrill Gorcunov <[email protected]> Cc: Frank Ch. Eigler <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Masami Hiramatsu <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Robert Richter <[email protected]> Cc: Stephane Eranian <[email protected]> Cc: Tom Zanussi <[email protected]> Cc: Ulrich Drepper <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
26 lines
567 B
C
26 lines
567 B
C
#ifndef _LINUX_PERF_REGS_H
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#define _LINUX_PERF_REGS_H
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#ifdef CONFIG_HAVE_PERF_REGS
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#include <asm/perf_regs.h>
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u64 perf_reg_value(struct pt_regs *regs, int idx);
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int perf_reg_validate(u64 mask);
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u64 perf_reg_abi(struct task_struct *task);
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#else
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static inline u64 perf_reg_value(struct pt_regs *regs, int idx)
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{
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return 0;
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}
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static inline int perf_reg_validate(u64 mask)
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{
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return mask ? -ENOSYS : 0;
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}
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static inline u64 perf_reg_abi(struct task_struct *task)
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{
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return PERF_SAMPLE_REGS_ABI_NONE;
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}
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#endif /* CONFIG_HAVE_PERF_REGS */
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#endif /* _LINUX_PERF_REGS_H */
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