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>
This commit is contained in:
Wang Nan 2015-09-14 23:02:49 -03:00 committed by Arnaldo Carvalho de Melo
parent 196581717d
commit 63ab024a5b
2 changed files with 12 additions and 0 deletions

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@ -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)),)

View File

@ -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