lkml.org 
[lkml]   [2014]   [Feb]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v5 4/7] ftrace: Add arm64 support to recordmcount
    Date
    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.

    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 b176bc0..6954959 100644
    --- a/arch/arm64/Kconfig
    +++ b/arch/arm64/Kconfig
    @@ -27,6 +27,7 @@ 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
    @@ -34,6 +35,7 @@ config ARM64
    select HAVE_DMA_CONTIGUOUS
    select HAVE_DYNAMIC_FTRACE
    select HAVE_EFFICIENT_UNALIGNED_ACCESS
    + 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 91280b8..397b6b8 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";
    --
    1.7.9.5


    \
     
     \ /
      Last update: 2014-02-28 19:41    [W:2.668 / U:0.044 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site