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| author | Nick Clifton <nickc@redhat.com> | 2016-02-04 16:27:06 +0000 |
|---|---|---|
| committer | Nick Clifton <nickc@redhat.com> | 2016-02-04 16:27:06 +0000 |
| commit | 13754e4c3d1b78945ecba225216f29d71334b77d (patch) | |
| tree | 4f8f706b92dd399bfa7a5446c258ff235ff444b6 | |
| parent | 31d913c7e4e84edf88b4324c3a9a8fb31c8206ec (diff) | |
| download | gdb-13754e4c3d1b78945ecba225216f29d71334b77d.zip gdb-13754e4c3d1b78945ecba225216f29d71334b77d.tar.gz gdb-13754e4c3d1b78945ecba225216f29d71334b77d.tar.bz2 | |
Prevent possible undefined behaviour computing the size of the scache by usingunsigned integers instead of signed integers.
* cgen-scache.c (scache_option_handler): Prevent possible
undefined behaviour computing the size of the scache by using
unsigned integers instead of signed integers.
| -rw-r--r-- | sim/common/ChangeLog | 6 | ||||
| -rw-r--r-- | sim/common/cgen-scache.c | 24 |
2 files changed, 19 insertions, 11 deletions
diff --git a/sim/common/ChangeLog b/sim/common/ChangeLog index fe25803..0483f8a 100644 --- a/sim/common/ChangeLog +++ b/sim/common/ChangeLog @@ -1,3 +1,9 @@ +2016-02-04 Nick Clifton <nickc@redhat.com> + + * cgen-scache.c (scache_option_handler): Prevent possible + undefined behaviour computing the size of the scache by using + unsigned integers instead of signed integers. + 2016-01-17 Joel Brobecker <brobecker@adacore.com> * sim-fpu.c: Minor comment fixes throughout. diff --git a/sim/common/cgen-scache.c b/sim/common/cgen-scache.c index 3a79514..cd1aa11 100644 --- a/sim/common/cgen-scache.c +++ b/sim/common/cgen-scache.c @@ -121,24 +121,26 @@ scache_option_handler (SIM_DESC sd, sim_cpu *cpu, int opt, { if (arg != NULL) { - int n = strtol (arg, NULL, 0); + unsigned int n = (unsigned int) strtoul (arg, NULL, 0); if (n < MIN_SCACHE_SIZE) { - sim_io_eprintf (sd, "invalid scache size `%d', must be at least 4", n); + sim_io_eprintf (sd, "invalid scache size `%u', must be at least %u", + n, MIN_SCACHE_SIZE); return SIM_RC_FAIL; } /* Ensure it's a multiple of 2. */ if ((n & (n - 1)) != 0) { - sim_io_eprintf (sd, "scache size `%d' not a multiple of 2\n", n); - { - /* round up to nearest multiple of 2 */ - int i; - for (i = 1; i < n; i <<= 1) - continue; - n = i; - } - sim_io_eprintf (sd, "rounding scache size up to %d\n", n); + unsigned int i; + sim_io_eprintf (sd, "scache size `%u' not a multiple of 2\n", n); + /* Round up to nearest multiple of 2. */ + for (i = 1; i && i < n; i <<= 1) + continue; + if (i) + { + n = i; + sim_io_eprintf (sd, "rounding scache size up to %u\n", n); + } } if (cpu == NULL) STATE_SCACHE_SIZE (sd) = n; |