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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2023-09-25 21:31:44 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-10-19 09:12:46 +0300 |
| commit | 48cf93bb168d506a8278a6fb25c2f88c1c93ce6e (patch) | |
| tree | 5243af9b8254b0bccfdd9a5a6d64d4c3a332c0ed /scripts/gdb/linux/utils.py | |
| parent | 8e9bd41e4ce1001f5b89e4c9a69f870f39d56c12 (diff) | |
| download | linux-48cf93bb168d506a8278a6fb25c2f88c1c93ce6e.tar.xz | |
powerpc/e500: Introduce _PAGE_READ and remove _PAGE_USER
e500 MMU has 6 page protection bits:
- R, W, X for supervisor
- R, W, X for user
It means that it can support X without R.
To do that, _PAGE_READ flag is needed.
With 32 bits PTE there is no bit available for it in PTE. On the
other hand the only real use of _PAGE_USER is to implement PAGE_NONE
by clearing _PAGE_USER. As _PAGE_NONE can also be implemented by
clearing _PAGE_READ, remove _PAGE_USER and add _PAGE_READ. Move
_PAGE_PRESENT into bit 30 so that _PAGE_READ can match SR bit.
With 64 bits PTE _PAGE_USER is already the combination of SR and UR
so all we need to do is to rename it _PAGE_READ.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/0849ab6bf7ae2af23f94b0457fa40d0ea3983fe4.1695659959.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'scripts/gdb/linux/utils.py')
0 files changed, 0 insertions, 0 deletions