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exec.c: address_space_translate: handle access to addr 0 of 2^64 sized region 

The memory API allows a MemoryRegion's size to be 2^64, as a special
case (otherwise the size always fits in a 64 bit integer). This meant
that attempts to access address zero in a 2^64 sized region would
assert in address_space_translate():

  #3  0x00007ffff3e4d192 in __GI___assert_fail#(assertion=0x555555a43f32
    "!a.hi", file=0x555555a43ef0 "include/qemu/int128.h", line=18,
    function=0x555555a4439f "int128_get64") at assert.c:103
  #4  0x0000555555877642 in int128_get64 (a=...)
    at include/qemu/int128.h:18
  #5  0x00005555558782f2 in address_space_translate (as=0x55555668d140,
   /addr=0, xlat=0x7fffafac9918, plen=0x7fffafac9920, is_write=false)
    at exec.c:221

Fix this by doing the 'min' operation in 128 bit arithmetic
rather than 64 bit arithmetic (we know the result of the 'min'
definitely fits in 64 bits because one of the inputs did).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Maydell 2013-06-20 15:18:04 +01:00 committed by Paolo Bonzini
parent 4eda32f588
commit 3752a03648
1 changed files with 1 additions and 1 deletions
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exec.c
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@ -218,7 +218,7 @@ MemoryRegionSection *address_space_translate(AddressSpace *as, hwaddr addr,
*xlat = addr + section->offset_within_region;
diff = int128_sub(section->mr->size, int128_make64(addr));
*plen = MIN(int128_get64(diff), *plen);
*plen = int128_get64(int128_min(diff, int128_make64(*plen)));
return section;
}
#endif