diff options
| author | Suraj Jitindar Singh <sjitindarsingh@gmail.com> | 2017-03-01 18:12:54 +1100 |
|---|---|---|
| committer | David Gibson <david@gibson.dropbear.id.au> | 2017-03-03 11:30:59 +1100 |
| commit | 07a68f990785a8574c78a36b21cf5165e46f1113 (patch) | |
| tree | ec2a208ab06040a3b57845b492a1bb4eca3a1f98 /target/ppc/cpu.h | |
| parent | 347a5c73bafd1b5872c9d3192a4d08f8aa1d5f5a (diff) | |
target/ppc: Move no-execute and guarded page checking into new function
A pte entry has bit fields which can be used to make a page no-execute or
guarded, if either of these bits are set then an instruction access to this
page will fail. Currently these bits are checked with the pp_prot function
however the ISA specifies that the access authority controlled by the
key-pp value pair should only be checked on an instruction access after
the no-execute and guard bits have already been verified to permit the
access.
Move the no-execute and guard bit checking into a new separate function.
Note that we can remove the check for the no-execute bit in the slb entry
since this check was already performed above when we obtained the slb
entry.
In the event that the no-execute or guard bits are set, an ISI should be
generated with the SRR1_NOEXEC_GUARD (0x10000000) bit set in srr1. Add a
define for this for clarity.
Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
[dwg: Move constants to cpu.h since they're not MMUv3 specific]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'target/ppc/cpu.h')
| -rw-r--r-- | target/ppc/cpu.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h index 42fed6ee25..14c286e09a 100644 --- a/target/ppc/cpu.h +++ b/target/ppc/cpu.h @@ -475,6 +475,7 @@ struct ppc_slb_t { /* SRR1 error code fields */ +#define SRR1_NOEXEC_GUARD 0x10000000 #define SRR1_PROTFAULT 0x08000000 #define SRR1_IAMR 0x00200000 |