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| author |   Sandipan Das <sandipan@linux.ibm.com> | 2020-07-27 09:30:36 +0530 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-07-29 21:02:10 +1000 |
| commit | 264d7fccc4711328a19f07e6bd57aee4c68803aa (patch) | |
| tree | 073d8e445862db4d4e910151ee6d47af135d86e9 /tools/testing/selftests/powerpc/include/pkeys.h | |
| parent | selftests/powerpc: Move pkey helpers to headers (diff) | |
| download | linux-dev-264d7fccc4711328a19f07e6bd57aee4c68803aa.tar.xz linux-dev-264d7fccc4711328a19f07e6bd57aee4c68803aa.zip | |
selftests/powerpc: Add pkey helpers for rights
This adds some new pkey-related helper to print
access rights of a pkey in the "rwx" format and
to generate different valid combinations of pkey
rights starting from a given combination.
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/6cc1c7d1f686618668a3e090f1d0c2a4cd9dea3f.1595821792.git.sandipan@linux.ibm.com
Diffstat (limited to 'tools/testing/selftests/powerpc/include/pkeys.h')
| -rw-r--r-- | tools/testing/selftests/powerpc/include/pkeys.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/include/pkeys.h b/tools/testing/selftests/powerpc/include/pkeys.h index 9b53a97e664e..6ba95039a034 100644 --- a/tools/testing/selftests/powerpc/include/pkeys.h +++ b/tools/testing/selftests/powerpc/include/pkeys.h @@ -105,4 +105,32 @@ int siginfo_pkey(siginfo_t *si) #endif } +#define pkey_rights(r) ({ \ + static char buf[4] = "rwx"; \ + unsigned int amr_bits; \ + if ((r) & PKEY_DISABLE_EXECUTE) \ + buf[2] = '-'; \ + amr_bits = (r) & PKEY_BITS_MASK; \ + if (amr_bits & PKEY_DISABLE_WRITE) \ + buf[1] = '-'; \ + if (amr_bits & PKEY_DISABLE_ACCESS & ~PKEY_DISABLE_WRITE) \ + buf[0] = '-'; \ + buf; \ +}) + +unsigned long next_pkey_rights(unsigned long rights) +{ + if (rights == PKEY_DISABLE_ACCESS) + return PKEY_DISABLE_EXECUTE; + else if (rights == (PKEY_DISABLE_ACCESS | PKEY_DISABLE_EXECUTE)) + return 0; + + if ((rights & PKEY_BITS_MASK) == 0) + rights |= PKEY_DISABLE_WRITE; + else if ((rights & PKEY_BITS_MASK) == PKEY_DISABLE_WRITE) + rights |= PKEY_DISABLE_ACCESS; + + return rights; +} + #endif /* _SELFTESTS_POWERPC_PKEYS_H */ |