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| author | Alan Modra <amodra@gmail.com> | 2023-01-26 18:44:51 +1030 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2023-01-27 08:18:46 +1030 |
| commit | 44a178cc69a05d03bcde37a4f46e4e8e81287b84 (patch) | |
| tree | c90ffb0fc95dc31f51cf42c4b07965e23bfac026 /gas/expr.c | |
| parent | c37de2981558eb7ba4aa473ab214d8f2fb0c9876 (diff) | |
| download | gdb-44a178cc69a05d03bcde37a4f46e4e8e81287b84.zip gdb-44a178cc69a05d03bcde37a4f46e4e8e81287b84.tar.gz gdb-44a178cc69a05d03bcde37a4f46e4e8e81287b84.tar.bz2 | |
resolve gas shift expressions with large exponents to zero
* expr.c (resolve_expression <O_left_shift, O_right_shift>): Resolve
shifts exceeding bits in a valueT to zero.
Diffstat (limited to 'gas/expr.c')
| -rw-r--r-- | gas/expr.c | 14 |
1 files changed, 12 insertions, 2 deletions
@@ -2320,8 +2320,18 @@ resolve_expression (expressionS *expressionP) return 0; left = (offsetT) left % (offsetT) right; break; - case O_left_shift: left <<= right; break; - case O_right_shift: left >>= right; break; + case O_left_shift: + if (right >= sizeof (left) * CHAR_BIT) + left = 0; + else + left <<= right; + break; + case O_right_shift: + if (right >= sizeof (left) * CHAR_BIT) + left = 0; + else + left >>= right; + break; case O_bit_inclusive_or: left |= right; break; case O_bit_or_not: left |= ~right; break; case O_bit_exclusive_or: left ^= right; break; |