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decodetree: Properly diagnose fields overflowing an insn

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Previously this would result in an exception for shifting
the field mask by a negative number.

Backports commit 2decfc95583dc28add69810eaca6ada7b4b44d3a from qemu
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Richard Henderson 2019-03-13 11:21:02 -04:00 committed by Lioncash
parent fcb49bb6f6
commit 4111a3a892
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 2 additions and 0 deletions
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2
qemu/scripts/decodetree.py
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@ -756,6 +756,8 @@ def parse_generic(lineno, is_format, name, toks):
sign = True sign = True
flen = flen[1:] flen = flen[1:]
shift = int(flen, 10) shift = int(flen, 10)
if shift + width > insnwidth:
error(lineno, 'field {0} exceeds insnwidth'.format(fname))
f = Field(sign, insnwidth - width - shift, shift) f = Field(sign, insnwidth - width - shift, shift)
flds = add_field(lineno, flds, fname, f) flds = add_field(lineno, flds, fname, f)
fixedbits <<= shift fixedbits <<= shift