Recordmcount utility scans every object, finds out all the locations of calling _mcount() and puts them into __mcount_loc section. linker compiles all the information in between __start_mcount_loc and __stop_mcount_loc for later use by ftrace.
There are two types of implementation, C or Perl. In arm64, only C version is used since HAVE_C_RECORDMCOUNT is defined.
Signed-off-by: AKASHI Takahiro takahiro.akashi@linaro.org --- arch/arm64/Kconfig | 2 ++ scripts/recordmcount.c | 4 ++++ scripts/recordmcount.pl | 5 +++++ 3 files changed, 11 insertions(+)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index c150430..4f4a0dc 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -19,11 +19,13 @@ config ARM64 select HARDIRQS_SW_RESEND select HAVE_ARCH_JUMP_LABEL 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_DYNAMIC_FTRACE + select HAVE_FTRACE_MCOUNT_RECORD select HAVE_FUNCTION_TRACER select HAVE_FUNCTION_GRAPH_TRACER select HAVE_GENERIC_DMA_COHERENT diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c index 9c22317..b92d9f7 100644 --- a/scripts/recordmcount.c +++ b/scripts/recordmcount.c @@ -347,6 +347,10 @@ 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; + altmcount = "_mcount"; + 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 a674fd5..ae8b0fe 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";