diff options
Diffstat (limited to 'lib/el3_runtime/aarch64/context.S')
| -rw-r--r-- | lib/el3_runtime/aarch64/context.S | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/lib/el3_runtime/aarch64/context.S b/lib/el3_runtime/aarch64/context.S index 1f8e23d2..f5fed72d 100644 --- a/lib/el3_runtime/aarch64/context.S +++ b/lib/el3_runtime/aarch64/context.S @@ -14,6 +14,10 @@ .global fpregs_context_save .global fpregs_context_restore #endif +#if CTX_INCLUDE_PAUTH_REGS + .global pauth_context_restore + .global pauth_context_save +#endif .global save_gp_registers .global restore_gp_registers .global restore_gp_registers_eret @@ -299,6 +303,76 @@ func fpregs_context_restore endfunc fpregs_context_restore #endif /* CTX_INCLUDE_FPREGS */ +#if CTX_INCLUDE_PAUTH_REGS +/* ----------------------------------------------------- + * The following function strictly follows the AArch64 + * PCS to use x9-x17 (temporary caller-saved registers) + * to save the ARMv8.3-PAuth register context. It assumes + * that 'sp' is pointing to a 'cpu_context_t' structure + * to where the register context will be saved. + * ----------------------------------------------------- + */ +func pauth_context_save + add x11, sp, #CTX_PAUTH_REGS_OFFSET + + mrs x9, APIAKeyLo_EL1 + mrs x10, APIAKeyHi_EL1 + stp x9, x10, [x11, #CTX_PACIAKEY_LO] + + mrs x9, APIBKeyLo_EL1 + mrs x10, APIBKeyHi_EL1 + stp x9, x10, [x11, #CTX_PACIBKEY_LO] + + mrs x9, APDAKeyLo_EL1 + mrs x10, APDAKeyHi_EL1 + stp x9, x10, [x11, #CTX_PACDAKEY_LO] + + mrs x9, APDBKeyLo_EL1 + mrs x10, APDBKeyHi_EL1 + stp x9, x10, [x11, #CTX_PACDBKEY_LO] + + mrs x9, APGAKeyLo_EL1 + mrs x10, APGAKeyHi_EL1 + stp x9, x10, [x11, #CTX_PACGAKEY_LO] + + ret +endfunc pauth_context_save + +/* ----------------------------------------------------- + * The following function strictly follows the AArch64 + * PCS to use x9-x17 (temporary caller-saved registers) + * to restore the ARMv8.3-PAuth register context. It assumes + * that 'sp' is pointing to a 'cpu_context_t' structure + * from where the register context will be restored. + * ----------------------------------------------------- + */ +func pauth_context_restore + add x11, sp, #CTX_PAUTH_REGS_OFFSET + + ldp x9, x10, [x11, #CTX_PACIAKEY_LO] + msr APIAKeyLo_EL1, x9 + msr APIAKeyHi_EL1, x10 + + ldp x9, x10, [x11, #CTX_PACIAKEY_LO] + msr APIBKeyLo_EL1, x9 + msr APIBKeyHi_EL1, x10 + + ldp x9, x10, [x11, #CTX_PACDAKEY_LO] + msr APDAKeyLo_EL1, x9 + msr APDAKeyHi_EL1, x10 + + ldp x9, x10, [x11, #CTX_PACDBKEY_LO] + msr APDBKeyLo_EL1, x9 + msr APDBKeyHi_EL1, x10 + + ldp x9, x10, [x11, #CTX_PACGAKEY_LO] + msr APGAKeyLo_EL1, x9 + msr APGAKeyHi_EL1, x10 + + ret +endfunc pauth_context_restore +#endif /* CTX_INCLUDE_PAUTH_REGS */ + /* ----------------------------------------------------- * The following functions are used to save and restore * all the general purpose registers. Ideally we would @@ -415,6 +489,11 @@ func el3_exit 1: #endif +#if CTX_INCLUDE_PAUTH_REGS + /* Restore ARMv8.3-PAuth registers */ + bl pauth_context_restore +#endif + /* Restore saved general purpose registers and return */ b restore_gp_registers_eret endfunc el3_exit |