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| author | Alexei Fedorov <Alexei.Fedorov@arm.com> | 2019-03-11 16:51:47 +0000 |
|---|---|---|
| committer | Alexei Fedorov <Alexei.Fedorov@arm.com> | 2019-03-12 17:04:50 +0000 |
| commit | fa6f774b285dc9ee4d312a955195a079fc4d2bb7 (patch) | |
| tree | 82b0e2c24ec28f0242dabbff02cf283704e56c4c /docs | |
| parent | c48d02bade88b07fa7f43aa44e5217f68e5d047f (diff) | |
| download | platform_external_arm-trusted-firmware-fa6f774b285dc9ee4d312a955195a079fc4d2bb7.tar.gz platform_external_arm-trusted-firmware-fa6f774b285dc9ee4d312a955195a079fc4d2bb7.tar.bz2 platform_external_arm-trusted-firmware-fa6f774b285dc9ee4d312a955195a079fc4d2bb7.zip | |
Allow setting compiler's target architecture
Change-Id: I56ea088f415bdb9077c385bd3450ff4b2cfa2eac
Signed-off-by: Alexei Fedorov <Alexei.Fedorov@arm.com>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/firmware-design.rst | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/docs/firmware-design.rst b/docs/firmware-design.rst index 9e206dc0f..52520ea12 100644 --- a/docs/firmware-design.rst +++ b/docs/firmware-design.rst @@ -2521,7 +2521,7 @@ section lists the usage of Architecture Extensions, and build flags controlling them. In general, and unless individually mentioned, the build options -``ARM_ARCH_MAJOR`` and ``ARM_ARCH_MINOR`` selects the Architecture Extension to +``ARM_ARCH_MAJOR`` and ``ARM_ARCH_MINOR`` select the Architecture Extension to target when building TF-A. Subsequent Arm Architecture Extensions are backward compatible with previous versions. @@ -2570,6 +2570,10 @@ Armv8.3-A ``CTX_INCLUDE_PAUTH_REGS`` to 1. This enables pointer authentication in BL1, BL2, BL31, and the TSP if it is used. + If ``ARM_ARCH_MAJOR == 8`` and ``ARM_ARCH_MINOR >= 3`` the code footprint of + enabling PAuth is lower because the compiler will use the optimized + PAuth instructions rather than the backwards-compatible ones. + Armv7-A ~~~~~~~ |