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| author | Max Filippov <jcmvbkbc@gmail.com> | 2022-05-13 18:11:14 +0300 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2022-05-17 13:35:43 +0300 |
| commit | 5cc5f19f884a75f0bf96b95b4292fcc81effd755 (patch) | |
| tree | a751a2cec798c43780f333a1bd2d4d2583833c07 /arch/xtensa/kernel/entry.S | |
| parent | d74862007e0849fad8ba86447e6f05928f920640 (diff) | |
| download | linux-5cc5f19f884a75f0bf96b95b4292fcc81effd755.tar.xz | |
xtensa: improve call0 ABI probing
When call0 userspace ABI support by probing is enabled instructions that
cause illegal instruction exception when PS.WOE is clear are retried
with PS.WOE set before calling c-level exception handler. Record user pc
at which PS.WOE was set in the fast exception handler and clear PS.WOE
in the c-level exception handler if we get there from the same address.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/kernel/entry.S')
| -rw-r--r-- | arch/xtensa/kernel/entry.S | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S index 3224b4ceca34..e3eae648ba2e 100644 --- a/arch/xtensa/kernel/entry.S +++ b/arch/xtensa/kernel/entry.S @@ -1056,6 +1056,11 @@ ENTRY(fast_illegal_instruction_user) movi a3, PS_WOE_MASK or a0, a0, a3 wsr a0, ps +#ifdef CONFIG_USER_ABI_CALL0_PROBE + GET_THREAD_INFO(a3, a2) + rsr a0, epc1 + s32i a0, a3, TI_PS_WOE_FIX_ADDR +#endif l32i a3, a2, PT_AREG3 l32i a0, a2, PT_AREG0 rsr a2, depc |