diff options
| 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 | |
| parent | 26e2ae39995469b9289aa1ec0144e256d56eb044 (diff) | |
| download | lwn-af64d2aa872a174772ffc00e2558083f70193acb.tar.gz lwn-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>
| -rw-r--r-- | arch/arm64/Kconfig | 2 | ||||
| -rw-r--r-- | scripts/recordmcount.c | 7 | ||||
| -rwxr-xr-x | scripts/recordmcount.pl | 5 |
3 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 78b356d079dd..c7022a9d5eeb 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -30,12 +30,14 @@ 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 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"; diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl index 91280b82da08..397b6b84e8c5 100755 --- a/scripts/recordmcount.pl +++ b/scripts/recordmcount.pl @@ -279,6 +279,11 @@ if ($arch eq "x86_64") { $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_ARM_(CALL|PC24|THM_CALL)" . "\\s+(__gnu_mcount_nc|mcount)\$"; +} elsif ($arch eq "arm64") { + $alignment = 3; + $section_type = '%progbits'; + $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_AARCH64_CALL26\\s+_mcount\$"; + $type = ".quad"; } elsif ($arch eq "ia64") { $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$"; $type = "data8"; |