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fix(el3_runtime): restore SPSR/ELR/SCR after esb

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SCR_EL3 register is restored before esb issued and it is assumed
that EAs are unmasked at that point, which is wrong, as the SCR_EL3
value at that time is restored from the context of the world where
it is returning to.

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: Id1c7150a70b5f589b0dc7c50c359b4d23ee9f256
This commit is contained in:
Manish Pandey 2022-11-17 14:43:15 +00:00
parent caaca4a104
commit ff1d2ef387
1 changed files with 21 additions and 21 deletions
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42
lib/el3_runtime/aarch64/context.S
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@ -1064,16 +1064,6 @@ func el3_exit
msr spsel, #MODE_SP_ELX
str x17, [sp, #CTX_EL3STATE_OFFSET + CTX_RUNTIME_SP]
/* ----------------------------------------------------------
* Restore SPSR_EL3, ELR_EL3 and SCR_EL3 prior to ERET
* ----------------------------------------------------------
*/
ldr x18, [sp, #CTX_EL3STATE_OFFSET + CTX_SCR_EL3]
ldp x16, x17, [sp, #CTX_EL3STATE_OFFSET + CTX_SPSR_EL3]
msr scr_el3, x18
msr spsr_el3, x16
msr elr_el3, x17
#if IMAGE_BL31
/* ----------------------------------------------------------
* Restore CPTR_EL3.
@ -1103,17 +1093,6 @@ sve_not_enabled:
1:
#endif /* IMAGE_BL31 && DYNAMIC_WORKAROUND_CVE_2018_3639 */
restore_ptw_el1_sys_regs
/* ----------------------------------------------------------
* Restore general purpose (including x30), PMCR_EL0 and
* ARMv8.3-PAuth registers.
* Exit EL3 via ERET to a lower exception level.
* ----------------------------------------------------------
*/
bl restore_gp_pmcr_pauth_regs
ldr x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_LR]
#if IMAGE_BL31 && RAS_EXTENSION
/* ----------------------------------------------------------
* Issue Error Synchronization Barrier to synchronize SErrors
@ -1127,6 +1106,27 @@ sve_not_enabled:
dsb sy
#endif /* IMAGE_BL31 && RAS_EXTENSION */
/* ----------------------------------------------------------
* Restore SPSR_EL3, ELR_EL3 and SCR_EL3 prior to ERET
* ----------------------------------------------------------
*/
ldr x18, [sp, #CTX_EL3STATE_OFFSET + CTX_SCR_EL3]
ldp x16, x17, [sp, #CTX_EL3STATE_OFFSET + CTX_SPSR_EL3]
msr scr_el3, x18
msr spsr_el3, x16
msr elr_el3, x17
restore_ptw_el1_sys_regs
/* ----------------------------------------------------------
* Restore general purpose (including x30), PMCR_EL0 and
* ARMv8.3-PAuth registers.
* Exit EL3 via ERET to a lower exception level.
* ----------------------------------------------------------
*/
bl restore_gp_pmcr_pauth_regs
ldr x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_LR]
#ifdef IMAGE_BL31
str xzr, [sp, #CTX_EL3STATE_OFFSET + CTX_IS_IN_EL3]
#endif /* IMAGE_BL31 */