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| author | Masami Hiramatsu <mhiramat@kernel.org> | 2019-04-12 23:22:01 +0900 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2019-04-12 17:04:27 +0100 |
| commit | a823c35ff2eda73046cc1847326071de350fceda (patch) | |
| tree | c1e5fa47ee4c105168ad1fbc08529f85e785a110 /arch/arm64/Kconfig | |
| parent | 691efbedc60d2a7364a90e38882fc762f06f52c4 (diff) | |
| download | lwn-a823c35ff2eda73046cc1847326071de350fceda.tar.gz lwn-a823c35ff2eda73046cc1847326071de350fceda.zip | |
arm64: ptrace: Add function argument access API
Add regs_get_argument() which returns N th argument of the function
call. On arm64, it supports up to 8th argument.
Note that this chooses most probably assignment, in some case
it can be incorrect (e.g. passing data structure or floating
point etc.)
This enables ftrace kprobe events to access kernel function
arguments via $argN syntax.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
[will: tidied up the comment a bit]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 555af5035592..c383625ec02c 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -148,6 +148,7 @@ config ARM64 select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP select HAVE_REGS_AND_STACK_ACCESS_API + select HAVE_FUNCTION_ARG_ACCESS_API select HAVE_RCU_TABLE_FREE select HAVE_RCU_TABLE_INVALIDATE select HAVE_RSEQ |