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Avoid possibly unaligned memory access.

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git-svn-id: svn://svn.valgrind.org/valgrind/trunk@12415
This commit is contained in:
Florian Krohm 2012-03-03 18:46:05 +00:00
parent 74d44d1764
commit d58aa28f82
1 changed files with 7 additions and 7 deletions
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14
memcheck/mc_main.c
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@ -3884,19 +3884,19 @@ static UInt mb_get_origin_for_guest_offset ( ThreadId tid,
Int offset, SizeT size )
{
Int sh2off;
UChar area[6];
UInt area[3];
UInt otag;
sh2off = MC_(get_otrack_shadow_offset)( offset, size );
if (sh2off == -1)
return 0; /* This piece of guest state is not tracked */
tl_assert(sh2off >= 0);
tl_assert(0 == (sh2off % 4));
area[0] = 0x31;
area[5] = 0x27;
VG_(get_shadow_regs_area)( tid, &area[1], 2/*shadowno*/,sh2off,4 );
tl_assert(area[0] == 0x31);
tl_assert(area[5] == 0x27);
otag = *(UInt*)&area[1];
area[0] = 0x31313131;
area[2] = 0x27272727;
VG_(get_shadow_regs_area)( tid, (UChar *)&area[1], 2/*shadowno*/,sh2off,4 );
tl_assert(area[0] == 0x31313131);
tl_assert(area[2] == 0x27272727);
otag = area[1];
return otag;
}