diff options
author | Thomas Huth <thuth@redhat.com> | 2016-04-14 17:14:52 +0200 |
---|---|---|
committer | David Gibson <david@gibson.dropbear.id.au> | 2016-04-18 15:14:38 +1000 |
commit | afbee7128c2399b6fca7b744ee560e3a1851118e (patch) | |
tree | 4ff672e1ae2b7a74012571f5efd1fd84f0195030 /target-ppc/cpu.h | |
parent | c7b45f12828c1ba7105dbc029c63d7de68eaa91c (diff) |
ppc: Fix the range check in the LSWI instruction
There are two issues: First, the number of registers that are used has
to be calculated with "(nb + 3) / 4" (i.e. round always up, not down).
Second, the "start <= ra && (start + nr - 32) > ra" condition for the
wrap-around case is wrong: It has to be tested with "||" instead of "&&".
Since we can reuse this check later for the LSWX instruction, let's
place the fixed code into a helper function, too.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'target-ppc/cpu.h')
-rw-r--r-- | target-ppc/cpu.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h index 9d4e43cf1f..5282533b38 100644 --- a/target-ppc/cpu.h +++ b/target-ppc/cpu.h @@ -2415,6 +2415,16 @@ static inline bool msr_is_64bit(CPUPPCState *env, target_ulong msr) return msr & (1ULL << MSR_SF); } +/** + * Check whether register rx is in the range between start and + * start + nregs (as needed by the LSWX and LSWI instructions) + */ +static inline bool lsw_reg_in_range(int start, int nregs, int rx) +{ + return (start + nregs <= 32 && rx >= start && rx < start + nregs) || + (start + nregs > 32 && (rx >= start || rx < start + nregs - 32)); +} + extern void (*cpu_ppc_hypercall)(PowerPCCPU *); #include "exec/exec-all.h" |