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| author |   AKASHI Takahiro <takahiro.akashi@linaro.org> | 2014-04-30 10:54:32 +0100 |
|---|---|---|
| committer |   Will Deacon <will.deacon@arm.com> | 2014-05-29 09:04:31 +0100 |
| commit | af64d2aa872a174772ffc00e2558083f70193acb (patch) | |
| tree | 28f7400e62fa0e764cb12761d103362480dcd6ed /scripts/recordmcount.c | |
| parent | arm64: Add 'notrace' attribute to unwind_frame() for ftrace (diff) | |
| download | linux-dev-af64d2aa872a174772ffc00e2558083f70193acb.tar.xz linux-dev-af64d2aa872a174772ffc00e2558083f70193acb.zip | |
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: Will Deacon <will.deacon@arm.com>
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"; |