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author | Wang Nan <wangnan0@huawei.com> | 2015-09-15 02:02:49 (GMT) |
---|---|---|
committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-09-15 12:48:33 (GMT) |
commit | 63ab024a5b6f295ca17a293ad81b7c728f49a89a (patch) | |
tree | 04460e9beb6d2a6bcbe7c576988661d42846129e | |
parent | 196581717d85f59365dc9303685cd5b1cdf106a3 (diff) | |
download | linux-63ab024a5b6f295ca17a293ad81b7c728f49a89a.tar.xz |
perf tools: regs_query_register_offset() infrastructure
regs_query_register_offset() is a helper function which converts
register name like "%rax" to offset of a register in 'struct pt_regs',
which is required by BPF prologue generator.
PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET indicates an architecture
supports converting name of a register to its offset in 'struct
pt_regs'.
HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET is introduced as the corresponding
CFLAGS of PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kaixu Xia <xiakaixu@huawei.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1441523623-152703-19-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com>
[ Extracted from eBPF patches ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r-- | tools/perf/config/Makefile | 4 | ||||
-rw-r--r-- | tools/perf/util/include/dwarf-regs.h | 8 |
2 files changed, 12 insertions, 0 deletions
diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile index 827557f..0435ac4 100644 --- a/tools/perf/config/Makefile +++ b/tools/perf/config/Makefile @@ -109,6 +109,10 @@ endif # include ARCH specific config -include $(src-perf)/arch/$(ARCH)/Makefile +ifdef PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET + CFLAGS += -DHAVE_ARCH_REGS_QUERY_REGISTER_OFFSET +endif + include $(src-perf)/config/utilities.mak ifeq ($(call get-executable,$(FLEX)),) diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h index 8f14965..07c644e 100644 --- a/tools/perf/util/include/dwarf-regs.h +++ b/tools/perf/util/include/dwarf-regs.h @@ -5,4 +5,12 @@ const char *get_arch_regstr(unsigned int n); #endif +#ifdef HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET +/* + * Arch should support fetching the offset of a register in pt_regs + * by its name. See kernel's regs_query_register_offset in + * arch/xxx/kernel/ptrace.c. + */ +int regs_query_register_offset(const char *name); +#endif #endif |