[Bug target/57648] Illegal use ARM Cortex M3 instruction LDMIA causes UserFault

[rearnsha at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57648

Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
static uint8_t source[sizeof(TestStruct) + 4] __attribute__((aligned(4)));
...
    // create a half-word aligned structure (fails!)
    TestStruct * sourcePtrFail = (TestStruct *) &(source[2]);

This has undefined behaviour.  Your TestStruct defintion is required (by the
ABI) to have word alignment.