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| author | Antonio Nino Diaz <antonio.ninodiaz@arm.com> | 2019-01-31 11:58:00 +0000 |
|---|---|---|
| committer | Antonio Nino Diaz <antonio.ninodiaz@arm.com> | 2019-02-27 11:08:59 +0000 |
| commit | 5283962ebaf77850d68bb457608ede5174e43159 (patch) | |
| tree | 28fbac607b59b0d21cdef870f74afa5a78f274d9 /make_helpers | |
| parent | 4d1ccf0ecc7d90df438148c633291723d095f979 (diff) | |
Add ARMv8.3-PAuth registers to CPU context
ARMv8.3-PAuth adds functionality that supports address authentication of
the contents of a register before that register is used as the target of
an indirect branch, or as a load.
This feature is supported only in AArch64 state.
This feature is mandatory in ARMv8.3 implementations.
This feature adds several registers to EL1. A new option called
CTX_INCLUDE_PAUTH_REGS has been added to select if the TF needs to save
them during Non-secure <-> Secure world switches. This option must be
enabled if the hardware has the registers or the values will be leaked
during world switches.
To prevent leaks, this patch also disables pointer authentication in the
Secure world if CTX_INCLUDE_PAUTH_REGS is 0. Any attempt to use it will
be trapped in EL3.
Change-Id: I27beba9907b9a86c6df1d0c5bf6180c972830855
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
Diffstat (limited to 'make_helpers')
| -rw-r--r-- | make_helpers/defaults.mk | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/make_helpers/defaults.mk b/make_helpers/defaults.mk index 76a9fd4f..64223977 100644 --- a/make_helpers/defaults.mk +++ b/make_helpers/defaults.mk @@ -51,6 +51,11 @@ CTX_INCLUDE_AARCH32_REGS := 1 # Include FP registers in cpu context CTX_INCLUDE_FPREGS := 0 +# Include pointer authentication (ARMv8.3-PAuth) registers in cpu context. This +# must be set to 1 if the platform wants to use this feature in the Secure +# world. It is not needed to use it in the Non-secure world. +CTX_INCLUDE_PAUTH_REGS := 0 + # Debug build DEBUG := 0 |