On 03/16/2018 1439 UTC, Zack Weinberg wrote:
On Fri, Mar 16, 2018 at 1323 UTC, John Reiser wrote:
The code 0x67 0xE8 0x7D 0xFF is "addr32 callq ...". Valgrind is complaining
about the 'addr32' opcode prefix. The compiler for locale_init.cc did a
not-so-good job. The addr32 prefix is a total waste; remove it.
This _could_ be an alignment hack. I don't see any of these prefixes
in my copy of libstdc++ but the compiler could plausibly be trying to
make the instruction right after the call be on a tidy address
boundary.
The 0x67 was at 0x48cc63d which is (-3 mod 16), so the following instruction
is at (+3 mod 16) [1 for the 0x67, 1 for the 0xE8, 4 for the 32-bit
displacement].
Alignment was not close to any auspicious boundary.
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Valgrind-users mailing list
Valgrind-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/valgrind-users
