system-arm: Fix FEAT_PAuth trapping in AArch64 bootloader
Now that we start running the bootloader at EL3, we need to setup the
SCR_EL3 register so that it doesn't trap any pointer authentication
instruction.
This is fixing the booting process of Linux kernels making use of
FEAT_PAuth
Change-Id: I08aa96908dd2c16438448f3cc3c47a1271b2dfa8
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/61069
Reviewed-by: Richard Cooper <richard.cooper@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/61736
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
diff --git a/system/arm/bootloader/arm64/boot.S b/system/arm/bootloader/arm64/boot.S
index 3809f72..5041561 100644
--- a/system/arm/bootloader/arm64/boot.S
+++ b/system/arm/bootloader/arm64/boot.S
@@ -59,6 +59,8 @@
orr x0, x0, #(1 << 0) // Non-secure EL1
orr x0, x0, #(1 << 8) // HVC enable
orr x0, x0, #(1 << 10) // 64-bit EL2
+ orr x0, x0, #(1 << 16) // Disable FEAT_PAuth traps (APK)
+ orr x0, x0, #(1 << 17) // Disable FEAT_PAuth traps (API)
msr scr_el3, x0
mov x0, #(1 << 8) // Disable SVE trap to EL3
