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scripts/recordmcount.{c,pl}: support -ffunction-sections .text.* section names
commit 9c8e2f6d3d
upstream.
When building with -ffunction-sections, the compiler will place each
function into its own ELF section, prefixed with ".text". For example,
a simple test module with functions test_module_do_work() and
test_module_wq_func():
% objdump --section-headers test_module.o | awk '/\.text/{print $2}'
.text
.text.test_module_do_work
.text.test_module_wq_func
.init.text
.exit.text
Adjust the recordmcount scripts to look for ".text" as a section name
prefix. This will ensure that those functions will be included in the
__mcount_loc relocations:
% objdump --reloc --section __mcount_loc test_module.o
OFFSET TYPE VALUE
0000000000000000 R_X86_64_64 .text.test_module_do_work
0000000000000008 R_X86_64_64 .text.test_module_wq_func
0000000000000010 R_X86_64_64 .init.text
Link: http://lkml.kernel.org/r/1542745158-25392-2-git-send-email-joe.lawrence@redhat.com
Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Manoj Gupta <manojgupta@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
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commit
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2 changed files with 14 additions and 1 deletions
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@ -401,7 +401,7 @@ static uint32_t (*w2)(uint16_t);
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static int
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is_mcounted_section_name(char const *const txtname)
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{
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return strcmp(".text", txtname) == 0 ||
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return strncmp(".text", txtname, 5) == 0 ||
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strcmp(".init.text", txtname) == 0 ||
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strcmp(".ref.text", txtname) == 0 ||
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strcmp(".sched.text", txtname) == 0 ||
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@ -142,6 +142,11 @@ my %text_sections = (
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".text.unlikely" => 1,
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);
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# Acceptable section-prefixes to record.
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my %text_section_prefixes = (
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".text." => 1,
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);
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# Note: we are nice to C-programmers here, thus we skip the '||='-idiom.
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$objdump = 'objdump' if (!$objdump);
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$objcopy = 'objcopy' if (!$objcopy);
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@ -523,6 +528,14 @@ while (<IN>) {
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# Only record text sections that we know are safe
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$read_function = defined($text_sections{$1});
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if (!$read_function) {
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foreach my $prefix (keys %text_section_prefixes) {
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if (substr($1, 0, length $prefix) eq $prefix) {
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$read_function = 1;
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last;
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}
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}
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}
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# print out any recorded offsets
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update_funcs();
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