From 4018994f3d8785275ef0e7391b75c3462c029e56 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Tue, 7 Aug 2012 15:20:37 +0200 Subject: perf: Add ability to attach user level registers dump to sample 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 [ Dump registers ABI specification. ] Signed-off-by: Jiri Olsa Suggested-by: Stephane Eranian Cc: "Frank Ch. Eigler" Cc: Arun Sharma Cc: Benjamin Redelings Cc: Corey Ashford Cc: Cyrill Gorcunov Cc: Frank Ch. Eigler Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Masami Hiramatsu Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Robert Richter Cc: Stephane Eranian Cc: Tom Zanussi Cc: Ulrich Drepper Link: http://lkml.kernel.org/r/1344345647-11536-3-git-send-email-jolsa@redhat.com Signed-off-by: Arnaldo Carvalho de Melo --- include/linux/perf_regs.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include/linux/perf_regs.h') diff --git a/include/linux/perf_regs.h b/include/linux/perf_regs.h index a2f1a98f7839..3c73d5fe18be 100644 --- a/include/linux/perf_regs.h +++ b/include/linux/perf_regs.h @@ -5,6 +5,7 @@ #include u64 perf_reg_value(struct pt_regs *regs, int idx); int perf_reg_validate(u64 mask); +u64 perf_reg_abi(struct task_struct *task); #else static inline u64 perf_reg_value(struct pt_regs *regs, int idx) { @@ -15,5 +16,10 @@ static inline int perf_reg_validate(u64 mask) { return mask ? -ENOSYS : 0; } + +static inline u64 perf_reg_abi(struct task_struct *task) +{ + return PERF_SAMPLE_REGS_ABI_NONE; +} #endif /* CONFIG_HAVE_PERF_REGS */ #endif /* _LINUX_PERF_REGS_H */ -- cgit v1.2.3-59-g8ed1b