diff options
| author | Antonio Niño Díaz <antonio.ninodiaz@arm.com> | 2018-10-24 11:29:57 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2018-10-24 11:29:57 +0200 |
| commit | 44445ae5d86f820c3764fdfac0a109f315ebb54f (patch) | |
| tree | 11bf7c45ce59d0dcfdd108c1fe2a5e3e3080d433 /lib | |
| parent | 414c9e6d86e80ef29b6fc8797df8aa1f4e1ea9c6 (diff) | |
| parent | 3ff4aaaca44b75504aec5ab5b72cd587a6fcd432 (diff) | |
| download | platform_external_arm-trusted-firmware-44445ae5d86f820c3764fdfac0a109f315ebb54f.tar.gz platform_external_arm-trusted-firmware-44445ae5d86f820c3764fdfac0a109f315ebb54f.tar.bz2 platform_external_arm-trusted-firmware-44445ae5d86f820c3764fdfac0a109f315ebb54f.zip | |
Merge pull request #1641 from jeenu-arm/ptrauth
AArch64: Enable lower ELs to use pointer authentication
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/el3_runtime/aarch64/context_mgmt.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/lib/el3_runtime/aarch64/context_mgmt.c b/lib/el3_runtime/aarch64/context_mgmt.c index acc8d6d26..d3984a289 100644 --- a/lib/el3_runtime/aarch64/context_mgmt.c +++ b/lib/el3_runtime/aarch64/context_mgmt.c @@ -290,6 +290,7 @@ void cm_prepare_el3_exit(uint32_t security_state) uint32_t sctlr_elx, scr_el3, mdcr_el2; cpu_context_t *ctx = cm_get_context(security_state); int el2_unused = 0; + uint64_t hcr_el2 = 0; assert(ctx); @@ -309,13 +310,20 @@ void cm_prepare_el3_exit(uint32_t security_state) * EL2 present but unused, need to disable safely. * SCTLR_EL2 can be ignored in this case. * - * Initialise all fields in HCR_EL2, except HCR_EL2.RW, - * to zero so that Non-secure operations do not trap to - * EL2. - * - * HCR_EL2.RW: Set this field to match SCR_EL3.RW + * Set EL2 register width appropriately: Set HCR_EL2 + * field to match SCR_EL3.RW. */ - write_hcr_el2((scr_el3 & SCR_RW_BIT) ? HCR_RW_BIT : 0); + if (scr_el3 & SCR_RW_BIT) + hcr_el2 |= HCR_RW_BIT; + + /* + * For Armv8.3 pointer authentication feature, disable + * traps to EL2 when accessing key registers or using + * pointer authentication instructions from lower ELs. + */ + hcr_el2 |= (HCR_API_BIT | HCR_APK_BIT); + + write_hcr_el2(hcr_el2); /* * Initialise CPTR_EL2 setting all fields rather than |