[Bug libc/606] New: profiling causes segfault in gmon mcount on ARM

["opensource at artnaseef dot com" <sourceware-bugzilla@sources.redhat.com>]

The gmon support for ARM often causes the profiled program to segfault in 
_monstartup() due to the allocation memory and setting of pointers; some times 
the p->froms pointer is assigned at an offset of 2 from a 4-byte boundary.

Due to the ARM CPU's odd handling of mis-aligned words, this leads to a 
segmentation fault.

The ARM CPU (at least in Little Endian Mode) handles mis-aligned accesses 
(offset 2 from a word boundary) by adjusting the address back to the immediately 
previous 4-byte boundary and swapping the low and high 2-byte words.

-- 
           Summary: profiling causes segfault in gmon mcount on ARM
           Product: glibc
           Version: 2.3.2
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: gotom at debian dot or dot jp
        ReportedBy: opensource at artnaseef dot com
                CC: glibc-bugs at sources dot redhat dot com,opensource at
                    artnaseef dot com
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: arm-linux
GCC target triplet: arm-linux


http://sources.redhat.com/bugzilla/show_bug.cgi?id=606

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