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author | AKASHI Takahiro <takahiro.akashi@linaro.org> | 2014-04-30 18:54:32 +0900 |
---|---|---|
committer | Alex Shi <alex.shi@linaro.org> | 2014-06-04 17:56:26 +0800 |
commit | d6de3f5c0fd18e13bbd786c410e2596f6389b475 (patch) | |
tree | 99bdf2ba27cf7cb4a8c3e53ec9b1c13a1459ed5b /scripts/recordmcount.c | |
parent | c0b39882849bbd4eb48620665307469237aa2e97 (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 'scripts/recordmcount.c')
-rw-r--r-- | scripts/recordmcount.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c index 9c22317778eb..e11aa4a156d2 100644 --- a/scripts/recordmcount.c +++ b/scripts/recordmcount.c @@ -40,6 +40,11 @@ #define R_METAG_NONE 3 #endif +#ifndef EM_AARCH64 +#define EM_AARCH64 183 +#define R_AARCH64_ABS64 257 +#endif + static int fd_map; /* File descriptor for file being modified. */ static int mmap_failed; /* Boolean flag. */ static void *ehdr_curr; /* current ElfXX_Ehdr * for resource cleanup */ @@ -347,6 +352,8 @@ do_file(char const *const fname) case EM_ARM: reltype = R_ARM_ABS32; altmcount = "__gnu_mcount_nc"; break; + case EM_AARCH64: + reltype = R_AARCH64_ABS64; gpfx = '_'; break; case EM_IA_64: reltype = R_IA64_IMM64; gpfx = '_'; break; case EM_METAG: reltype = R_METAG_ADDR32; altmcount = "_mcount_wrapper"; |