diff options
| author | Alan Modra <amodra@gmail.com> | 2019-12-10 23:02:37 +1030 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2019-12-11 11:38:04 +1030 |
| commit | 0ef562a4b5da6bc1f16b2ea801b228acafd033d8 (patch) | |
| tree | 4d87c16e9066d5947b56c349141008c063a76b6f /opcodes | |
| parent | 2fd2b153a3819d3ab6b9c4cf06943d498187714c (diff) | |
| download | gdb-0ef562a4b5da6bc1f16b2ea801b228acafd033d8.zip gdb-0ef562a4b5da6bc1f16b2ea801b228acafd033d8.tar.gz gdb-0ef562a4b5da6bc1f16b2ea801b228acafd033d8.tar.bz2 | |
ubsan: cr16: left shift cannot be represented in type 'int'
This was:
unsigned long mask = SBM (instruction->match_bits);
with
#define SBM(offs) ((((1 << (32 - offs)) -1) << (offs)))
Well, there are a couple of problems. Firstly, the expression uses
int values (1 rather than 1u or 1ul) resulting in the ubsan error, and
secondly, a zero offs will result in a 32-bit shift which is undefined
if ints are only 32 bits.
* cr16-dis.c (EXTRACT, SBM): Rewrite.
(cr16_match_opcode): Delete duplicate bcond test.
Diffstat (limited to 'opcodes')
| -rw-r--r-- | opcodes/ChangeLog | 5 | ||||
| -rw-r--r-- | opcodes/cr16-dis.c | 11 |
2 files changed, 9 insertions, 7 deletions
diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog index faa160a..57212f8 100644 --- a/opcodes/ChangeLog +++ b/opcodes/ChangeLog @@ -1,5 +1,10 @@ 2019-12-11 Alan Modra <amodra@gmail.com> + * cr16-dis.c (EXTRACT, SBM): Rewrite. + (cr16_match_opcode): Delete duplicate bcond test. + +2019-12-11 Alan Modra <amodra@gmail.com> + * bfin-dis.c (HOST_LONG_WORD_SIZE, XFIELD): Delete. (SIGNBIT): New. (MASKBITS, SIGNEXTEND): Rewrite. diff --git a/opcodes/cr16-dis.c b/opcodes/cr16-dis.c index 65cf91c..68fbe42 100644 --- a/opcodes/cr16-dis.c +++ b/opcodes/cr16-dis.c @@ -30,11 +30,11 @@ /* Extract 'n_bits' from 'a' starting from offset 'offs'. */ #define EXTRACT(a, offs, n_bits) \ - (n_bits == 32 ? (((a) >> (offs)) & 0xffffffffL) \ - : (((a) >> (offs)) & ((1 << (n_bits)) -1))) + (((a) >> (offs)) & ((1ul << ((n_bits) - 1) << 1) - 1)) -/* Set Bit Mask - a mask to set all bits starting from offset 'offs'. */ -#define SBM(offs) ((((1 << (32 - offs)) -1) << (offs))) +/* Set Bit Mask - a mask to set all bits in a 32-bit word starting + from offset 'offs'. */ +#define SBM(offs) ((1ul << 31 << 1) - (1ul << (offs))) typedef struct { @@ -329,9 +329,6 @@ cr16_match_opcode (void) while (instruction >= cr16_instruction) { mask = build_mask (); - /* Adjust mask for bcond with 32-bit size instruction */ - if ((IS_INSN_MNEMONIC("b") && instruction->size == 2)) - mask = 0xff0f0000; if ((doubleWord & mask) == BIN (instruction->match, instruction->match_bits)) |