diff options
| author | AKASHI Takahiro <takahiro.akashi@linaro.org> | 2014-04-30 18:54:32 +0900 |
|---|---|---|
| committer | Show Liu <show.liu@linaro.org> | 2014-06-18 12:04:08 +0800 |
| commit | 04f52bd45dcf2a7ad730213cf26c4ae563866292 (patch) | |
| tree | f43ac3be9626f4ea1ad25fa4921146f44202f1b0 /arch | |
| parent | 160d45d84dfabefc8c06e07444ad4db18caf6ab6 (diff) | |
ftrace: Add arm64 support to recordmcount
Recordmcount utility under scripts is run, after compiling each object,
to find out all the locations of calling _mcount() and put them into
specific seciton named __mcount_loc.
Then linker collects all such information into a table in the kernel image
(between __start_mcount_loc and __stop_mcount_loc) for later use by ftrace.
This patch adds arm64 specific definitions to identify such locations.
There are two types of implementation, C and Perl. On arm64, only C version
is used to build the kernel now that CONFIG_HAVE_C_RECORDMCOUNT is on.
But Perl version is also maintained.
This patch also contains a workaround just in case where a header file,
elf.h, on host machine doesn't have definitions of EM_AARCH64 nor
R_AARCH64_ABS64. Without them, compiling C version of recordmcount will
fail.
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
(cherry picked from LSK commit 6470430d6d73aa46e00cc28ee732b292538419c9)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Conflicts:
arch/arm64/Kconfig
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/Kconfig | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 516d8a7ca69..0f1fa57ea76 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -29,12 +29,14 @@ config ARM64 select HAVE_ARCH_JUMP_LABEL select HAVE_ARCH_KGDB select HAVE_ARCH_TRACEHOOK + select HAVE_C_RECORDMCOUNT select HAVE_DEBUG_BUGVERBOSE select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_API_DEBUG select HAVE_DMA_ATTRS select HAVE_DMA_CONTIGUOUS select HAVE_EFFICIENT_UNALIGNED_ACCESS + select HAVE_FTRACE_MCOUNT_RECORD select HAVE_GENERIC_DMA_COHERENT select HAVE_HW_BREAKPOINT if PERF_EVENTS select HAVE_MEMBLOCK |