Commit 2e885057 authored Dec 19, 2011 by David Daney Committed by Steven Rostedt Jan 06, 2012

recordmcount: Fix handling of elf64 big-endian objects.

In ELF64, the sh_flags field is 64-bits wide.  recordmcount was
erroneously treating it as a 32-bit wide field.  For little endian
objects this works because the flags of interest (SHF_EXECINSTR)
reside in the lower 32 bits of the word, and you get the same result
with either a 32-bit or 64-bit read.  Big endian objects on the
other hand do not work at all with this error.

The fix:  Correctly treat sh_flags as 64-bits wide in elf64 objects.

The symptom I observed was that my
__start_mcount_loc..__stop_mcount_loc was empty even though ftrace
function tracing was enabled.

Link: http://lkml.kernel.org/r/1324345362-12230-1-git-send-email-ddaney.cavm@gmail.com



Cc: stable@kernel.org # 3.0+
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

parent 805a6af8

scripts/recordmcount.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -462,7 +462,7 @@ __has_rel_mcount(Elf_Shdr const const relhdr, / is SHT_REL or SHT_RELA */
		succeed_file();
		}
		if (w(txthdr->sh_type) != SHT_PROGBITS \|\|
		!(w(txthdr->sh_flags) & SHF_EXECINSTR))
		!(_w(txthdr->sh_flags) & SHF_EXECINSTR))
		return NULL;
		return txtname;
		}