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| author | Matt Fleming <matthew.fleming@imgtec.com> | 2008-11-07 13:26:25 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-08 09:51:44 +0100 |
| commit | 7d5222a6afa4e429f55df8c086adb747837cbdf5 (patch) | |
| tree | 9b3413d92a1ba1cb5237d82c76fb8a48cda7c4fa /scripts | |
| parent | c76f06945be50564f925799ddfb6235ee4c26aa0 (diff) | |
| download | linux-7d5222a6afa4e429f55df8c086adb747837cbdf5.tar.gz linux-7d5222a6afa4e429f55df8c086adb747837cbdf5.tar.bz2 linux-7d5222a6afa4e429f55df8c086adb747837cbdf5.zip | |
ftrace: align __mcount_loc sections
Impact: add alignment option for recordmcount.pl script
Align the __mcount_loc sections so that architectures with strict
alignment requirements need not worry about performing unaligned
accesses.
This fixes an issue where I was seeing unaligned accesses, which are not
supported on our architecture (the results of an unaligned access are
undefined).
Signed-off-by: Matt Fleming <matthew.fleming@imgtec.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'scripts')
| -rwxr-xr-x | scripts/recordmcount.pl | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl index 6b9fe3eb8360..eeac71c87c66 100755 --- a/scripts/recordmcount.pl +++ b/scripts/recordmcount.pl @@ -134,6 +134,7 @@ my $section_regex; # Find the start of a section my $function_regex; # Find the name of a function # (return offset and func name) my $mcount_regex; # Find the call site to mcount (return offset) +my $alignment; # The .align value to use for $mcount_section if ($arch eq "x86") { if ($bits == 64) { @@ -148,6 +149,7 @@ if ($arch eq "x86_64") { $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount([+-]0x[0-9a-zA-Z]+)?\$"; $type = ".quad"; + $alignment = 8; # force flags for this arch $ld .= " -m elf_x86_64"; @@ -160,6 +162,7 @@ if ($arch eq "x86_64") { $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$"; $type = ".long"; + $alignment = 4; # force flags for this arch $ld .= " -m elf_i386"; @@ -288,6 +291,7 @@ sub update_funcs open(FILE, ">$mcount_s") || die "can't create $mcount_s\n"; $opened = 1; print FILE "\t.section $mcount_section,\"a\",\@progbits\n"; + print FILE "\t.align $alignment\n"; } printf FILE "\t%s %s + %d\n", $type, $ref_func, $offsets[$i] - $offset; } |