| /* |
| * Copyright (c) 2013-2021, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <arch.h> |
| #include <asm_macros.S> |
| #include <assert_macros.S> |
| #include <context.h> |
| #include <el3_common_macros.S> |
| |
| #if CTX_INCLUDE_EL2_REGS |
| .global el2_sysregs_context_save |
| .global el2_sysregs_context_restore |
| #endif |
| |
| .global el1_sysregs_context_save |
| .global el1_sysregs_context_restore |
| #if CTX_INCLUDE_FPREGS |
| .global fpregs_context_save |
| .global fpregs_context_restore |
| #endif |
| .global save_gp_pmcr_pauth_regs |
| .global restore_gp_pmcr_pauth_regs |
| .global save_and_update_ptw_el1_sys_regs |
| .global el3_exit |
| |
| #if CTX_INCLUDE_EL2_REGS |
| |
| /* ----------------------------------------------------- |
| * The following function strictly follows the AArch64 |
| * PCS to use x9-x16 (temporary caller-saved registers) |
| * to save EL2 system register context. It assumes that |
| * 'x0' is pointing to a 'el2_sys_regs' structure where |
| * the register context will be saved. |
| * |
| * The following registers are not added. |
| * AMEVCNTVOFF0<n>_EL2 |
| * AMEVCNTVOFF1<n>_EL2 |
| * ICH_AP0R<n>_EL2 |
| * ICH_AP1R<n>_EL2 |
| * ICH_LR<n>_EL2 |
| * ----------------------------------------------------- |
| */ |
| func el2_sysregs_context_save |
| mrs x9, actlr_el2 |
| mrs x10, afsr0_el2 |
| stp x9, x10, [x0, #CTX_ACTLR_EL2] |
| |
| mrs x11, afsr1_el2 |
| mrs x12, amair_el2 |
| stp x11, x12, [x0, #CTX_AFSR1_EL2] |
| |
| mrs x13, cnthctl_el2 |
| mrs x14, cntvoff_el2 |
| stp x13, x14, [x0, #CTX_CNTHCTL_EL2] |
| |
| mrs x15, cptr_el2 |
| str x15, [x0, #CTX_CPTR_EL2] |
| |
| #if CTX_INCLUDE_AARCH32_REGS |
| mrs x16, dbgvcr32_el2 |
| str x16, [x0, #CTX_DBGVCR32_EL2] |
| #endif |
| |
| mrs x9, elr_el2 |
| mrs x10, esr_el2 |
| stp x9, x10, [x0, #CTX_ELR_EL2] |
| |
| mrs x11, far_el2 |
| mrs x12, hacr_el2 |
| stp x11, x12, [x0, #CTX_FAR_EL2] |
| |
| mrs x13, hcr_el2 |
| mrs x14, hpfar_el2 |
| stp x13, x14, [x0, #CTX_HCR_EL2] |
| |
| mrs x15, hstr_el2 |
| mrs x16, ICC_SRE_EL2 |
| stp x15, x16, [x0, #CTX_HSTR_EL2] |
| |
| mrs x9, ICH_HCR_EL2 |
| mrs x10, ICH_VMCR_EL2 |
| stp x9, x10, [x0, #CTX_ICH_HCR_EL2] |
| |
| mrs x11, mair_el2 |
| mrs x12, mdcr_el2 |
| stp x11, x12, [x0, #CTX_MAIR_EL2] |
| |
| #if ENABLE_SPE_FOR_LOWER_ELS |
| mrs x13, PMSCR_EL2 |
| str x13, [x0, #CTX_PMSCR_EL2] |
| #endif |
| mrs x14, sctlr_el2 |
| str x14, [x0, #CTX_SCTLR_EL2] |
| |
| mrs x15, spsr_el2 |
| mrs x16, sp_el2 |
| stp x15, x16, [x0, #CTX_SPSR_EL2] |
| |
| mrs x9, tcr_el2 |
| mrs x10, tpidr_el2 |
| stp x9, x10, [x0, #CTX_TCR_EL2] |
| |
| mrs x11, ttbr0_el2 |
| mrs x12, vbar_el2 |
| stp x11, x12, [x0, #CTX_TTBR0_EL2] |
| |
| mrs x13, vmpidr_el2 |
| mrs x14, vpidr_el2 |
| stp x13, x14, [x0, #CTX_VMPIDR_EL2] |
| |
| mrs x15, vtcr_el2 |
| mrs x16, vttbr_el2 |
| stp x15, x16, [x0, #CTX_VTCR_EL2] |
| |
| #if CTX_INCLUDE_MTE_REGS |
| mrs x9, TFSR_EL2 |
| str x9, [x0, #CTX_TFSR_EL2] |
| #endif |
| |
| #if ENABLE_MPAM_FOR_LOWER_ELS |
| mrs x10, MPAM2_EL2 |
| str x10, [x0, #CTX_MPAM2_EL2] |
| |
| mrs x11, MPAMHCR_EL2 |
| mrs x12, MPAMVPM0_EL2 |
| stp x11, x12, [x0, #CTX_MPAMHCR_EL2] |
| |
| mrs x13, MPAMVPM1_EL2 |
| mrs x14, MPAMVPM2_EL2 |
| stp x13, x14, [x0, #CTX_MPAMVPM1_EL2] |
| |
| mrs x15, MPAMVPM3_EL2 |
| mrs x16, MPAMVPM4_EL2 |
| stp x15, x16, [x0, #CTX_MPAMVPM3_EL2] |
| |
| mrs x9, MPAMVPM5_EL2 |
| mrs x10, MPAMVPM6_EL2 |
| stp x9, x10, [x0, #CTX_MPAMVPM5_EL2] |
| |
| mrs x11, MPAMVPM7_EL2 |
| mrs x12, MPAMVPMV_EL2 |
| stp x11, x12, [x0, #CTX_MPAMVPM7_EL2] |
| #endif |
| |
| #if ARM_ARCH_AT_LEAST(8, 6) |
| mrs x13, HAFGRTR_EL2 |
| mrs x14, HDFGRTR_EL2 |
| stp x13, x14, [x0, #CTX_HAFGRTR_EL2] |
| |
| mrs x15, HDFGWTR_EL2 |
| mrs x16, HFGITR_EL2 |
| stp x15, x16, [x0, #CTX_HDFGWTR_EL2] |
| |
| mrs x9, HFGRTR_EL2 |
| mrs x10, HFGWTR_EL2 |
| stp x9, x10, [x0, #CTX_HFGRTR_EL2] |
| |
| mrs x11, CNTPOFF_EL2 |
| str x11, [x0, #CTX_CNTPOFF_EL2] |
| #endif |
| |
| #if ARM_ARCH_AT_LEAST(8, 4) |
| mrs x12, contextidr_el2 |
| str x12, [x0, #CTX_CONTEXTIDR_EL2] |
| |
| #if CTX_INCLUDE_AARCH32_REGS |
| mrs x13, sder32_el2 |
| str x13, [x0, #CTX_SDER32_EL2] |
| #endif |
| mrs x14, ttbr1_el2 |
| mrs x15, vdisr_el2 |
| stp x14, x15, [x0, #CTX_TTBR1_EL2] |
| |
| #if CTX_INCLUDE_NEVE_REGS |
| mrs x16, vncr_el2 |
| str x16, [x0, #CTX_VNCR_EL2] |
| #endif |
| |
| mrs x9, vsesr_el2 |
| mrs x10, vstcr_el2 |
| stp x9, x10, [x0, #CTX_VSESR_EL2] |
| |
| mrs x11, vsttbr_el2 |
| mrs x12, TRFCR_EL2 |
| stp x11, x12, [x0, #CTX_VSTTBR_EL2] |
| #endif |
| |
| #if ARM_ARCH_AT_LEAST(8, 5) |
| mrs x13, scxtnum_el2 |
| str x13, [x0, #CTX_SCXTNUM_EL2] |
| #endif |
| |
| ret |
| endfunc el2_sysregs_context_save |
| |
| |
| /* ----------------------------------------------------- |
| * The following function strictly follows the AArch64 |
| * PCS to use x9-x16 (temporary caller-saved registers) |
| * to restore EL2 system register context. It assumes |
| * that 'x0' is pointing to a 'el2_sys_regs' structure |
| * from where the register context will be restored |
| |
| * The following registers are not restored |
| * AMEVCNTVOFF0<n>_EL2 |
| * AMEVCNTVOFF1<n>_EL2 |
| * ICH_AP0R<n>_EL2 |
| * ICH_AP1R<n>_EL2 |
| * ICH_LR<n>_EL2 |
| * ----------------------------------------------------- |
| */ |
| func el2_sysregs_context_restore |
| ldp x9, x10, [x0, #CTX_ACTLR_EL2] |
| msr actlr_el2, x9 |
| msr afsr0_el2, x10 |
| |
| ldp x11, x12, [x0, #CTX_AFSR1_EL2] |
| msr afsr1_el2, x11 |
| msr amair_el2, x12 |
| |
| ldp x13, x14, [x0, #CTX_CNTHCTL_EL2] |
| msr cnthctl_el2, x13 |
| msr cntvoff_el2, x14 |
| |
| ldr x15, [x0, #CTX_CPTR_EL2] |
| msr cptr_el2, x15 |
| |
| #if CTX_INCLUDE_AARCH32_REGS |
| ldr x16, [x0, #CTX_DBGVCR32_EL2] |
| msr dbgvcr32_el2, x16 |
| #endif |
| |
| ldp x9, x10, [x0, #CTX_ELR_EL2] |
| msr elr_el2, x9 |
| msr esr_el2, x10 |
| |
| ldp x11, x12, [x0, #CTX_FAR_EL2] |
| msr far_el2, x11 |
| msr hacr_el2, x12 |
| |
| ldp x13, x14, [x0, #CTX_HCR_EL2] |
| msr hcr_el2, x13 |
| msr hpfar_el2, x14 |
| |
| ldp x15, x16, [x0, #CTX_HSTR_EL2] |
| msr hstr_el2, x15 |
| msr ICC_SRE_EL2, x16 |
| |
| ldp x9, x10, [x0, #CTX_ICH_HCR_EL2] |
| msr ICH_HCR_EL2, x9 |
| msr ICH_VMCR_EL2, x10 |
| |
| ldp x11, x12, [x0, #CTX_MAIR_EL2] |
| msr mair_el2, x11 |
| msr mdcr_el2, x12 |
| |
| #if ENABLE_SPE_FOR_LOWER_ELS |
| ldr x13, [x0, #CTX_PMSCR_EL2] |
| msr PMSCR_EL2, x13 |
| #endif |
| ldr x14, [x0, #CTX_SCTLR_EL2] |
| msr sctlr_el2, x14 |
| |
| ldp x15, x16, [x0, #CTX_SPSR_EL2] |
| msr spsr_el2, x15 |
| msr sp_el2, x16 |
| |
| ldp x9, x10, [x0, #CTX_TCR_EL2] |
| msr tcr_el2, x9 |
| msr tpidr_el2, x10 |
| |
| ldp x11, x12, [x0, #CTX_TTBR0_EL2] |
| msr ttbr0_el2, x11 |
| msr vbar_el2, x12 |
| |
| ldp x13, x14, [x0, #CTX_VMPIDR_EL2] |
| msr vmpidr_el2, x13 |
| msr vpidr_el2, x14 |
| |
| ldp x15, x16, [x0, #CTX_VTCR_EL2] |
| msr vtcr_el2, x15 |
| msr vttbr_el2, x16 |
| |
| #if CTX_INCLUDE_MTE_REGS |
| ldr x9, [x0, #CTX_TFSR_EL2] |
| msr TFSR_EL2, x9 |
| #endif |
| |
| #if ENABLE_MPAM_FOR_LOWER_ELS |
| ldr x10, [x0, #CTX_MPAM2_EL2] |
| msr MPAM2_EL2, x10 |
| |
| ldp x11, x12, [x0, #CTX_MPAMHCR_EL2] |
| msr MPAMHCR_EL2, x11 |
| msr MPAMVPM0_EL2, x12 |
| |
| ldp x13, x14, [x0, #CTX_MPAMVPM1_EL2] |
| msr MPAMVPM1_EL2, x13 |
| msr MPAMVPM2_EL2, x14 |
| |
| ldp x15, x16, [x0, #CTX_MPAMVPM3_EL2] |
| msr MPAMVPM3_EL2, x15 |
| msr MPAMVPM4_EL2, x16 |
| |
| ldp x9, x10, [x0, #CTX_MPAMVPM5_EL2] |
| msr MPAMVPM5_EL2, x9 |
| msr MPAMVPM6_EL2, x10 |
| |
| ldp x11, x12, [x0, #CTX_MPAMVPM7_EL2] |
| msr MPAMVPM7_EL2, x11 |
| msr MPAMVPMV_EL2, x12 |
| #endif |
| |
| #if ARM_ARCH_AT_LEAST(8, 6) |
| ldp x13, x14, [x0, #CTX_HAFGRTR_EL2] |
| msr HAFGRTR_EL2, x13 |
| msr HDFGRTR_EL2, x14 |
| |
| ldp x15, x16, [x0, #CTX_HDFGWTR_EL2] |
| msr HDFGWTR_EL2, x15 |
| msr HFGITR_EL2, x16 |
| |
| ldp x9, x10, [x0, #CTX_HFGRTR_EL2] |
| msr HFGRTR_EL2, x9 |
| msr HFGWTR_EL2, x10 |
| |
| ldr x11, [x0, #CTX_CNTPOFF_EL2] |
| msr CNTPOFF_EL2, x11 |
| #endif |
| |
| #if ARM_ARCH_AT_LEAST(8, 4) |
| ldr x12, [x0, #CTX_CONTEXTIDR_EL2] |
| msr contextidr_el2, x12 |
| |
| #if CTX_INCLUDE_AARCH32_REGS |
| ldr x13, [x0, #CTX_SDER32_EL2] |
| msr sder32_el2, x13 |
| #endif |
| ldp x14, x15, [x0, #CTX_TTBR1_EL2] |
| msr ttbr1_el2, x14 |
| msr vdisr_el2, x15 |
| |
| #if CTX_INCLUDE_NEVE_REGS |
| ldr x16, [x0, #CTX_VNCR_EL2] |
| msr vncr_el2, x16 |
| #endif |
| |
| ldp x9, x10, [x0, #CTX_VSESR_EL2] |
| msr vsesr_el2, x9 |
| msr vstcr_el2, x10 |
| |
| ldp x11, x12, [x0, #CTX_VSTTBR_EL2] |
| msr vsttbr_el2, x11 |
| msr TRFCR_EL2, x12 |
| #endif |
| |
| #if ARM_ARCH_AT_LEAST(8, 5) |
| ldr x13, [x0, #CTX_SCXTNUM_EL2] |
| msr scxtnum_el2, x13 |
| #endif |
| |
| ret |
| endfunc el2_sysregs_context_restore |
| |
| #endif /* CTX_INCLUDE_EL2_REGS */ |
| |
| /* ------------------------------------------------------------------ |
| * The following function strictly follows the AArch64 PCS to use |
| * x9-x17 (temporary caller-saved registers) to save EL1 system |
| * register context. It assumes that 'x0' is pointing to a |
| * 'el1_sys_regs' structure where the register context will be saved. |
| * ------------------------------------------------------------------ |
| */ |
| func el1_sysregs_context_save |
| |
| mrs x9, spsr_el1 |
| mrs x10, elr_el1 |
| stp x9, x10, [x0, #CTX_SPSR_EL1] |
| |
| #if !ERRATA_SPECULATIVE_AT |
| mrs x15, sctlr_el1 |
| mrs x16, tcr_el1 |
| stp x15, x16, [x0, #CTX_SCTLR_EL1] |
| #endif |
| |
| mrs x17, cpacr_el1 |
| mrs x9, csselr_el1 |
| stp x17, x9, [x0, #CTX_CPACR_EL1] |
| |
| mrs x10, sp_el1 |
| mrs x11, esr_el1 |
| stp x10, x11, [x0, #CTX_SP_EL1] |
| |
| mrs x12, ttbr0_el1 |
| mrs x13, ttbr1_el1 |
| stp x12, x13, [x0, #CTX_TTBR0_EL1] |
| |
| mrs x14, mair_el1 |
| mrs x15, amair_el1 |
| stp x14, x15, [x0, #CTX_MAIR_EL1] |
| |
| mrs x16, actlr_el1 |
| mrs x17, tpidr_el1 |
| stp x16, x17, [x0, #CTX_ACTLR_EL1] |
| |
| mrs x9, tpidr_el0 |
| mrs x10, tpidrro_el0 |
| stp x9, x10, [x0, #CTX_TPIDR_EL0] |
| |
| mrs x13, par_el1 |
| mrs x14, far_el1 |
| stp x13, x14, [x0, #CTX_PAR_EL1] |
| |
| mrs x15, afsr0_el1 |
| mrs x16, afsr1_el1 |
| stp x15, x16, [x0, #CTX_AFSR0_EL1] |
| |
| mrs x17, contextidr_el1 |
| mrs x9, vbar_el1 |
| stp x17, x9, [x0, #CTX_CONTEXTIDR_EL1] |
| |
| /* Save AArch32 system registers if the build has instructed so */ |
| #if CTX_INCLUDE_AARCH32_REGS |
| mrs x11, spsr_abt |
| mrs x12, spsr_und |
| stp x11, x12, [x0, #CTX_SPSR_ABT] |
| |
| mrs x13, spsr_irq |
| mrs x14, spsr_fiq |
| stp x13, x14, [x0, #CTX_SPSR_IRQ] |
| |
| mrs x15, dacr32_el2 |
| mrs x16, ifsr32_el2 |
| stp x15, x16, [x0, #CTX_DACR32_EL2] |
| #endif |
| |
| /* Save NS timer registers if the build has instructed so */ |
| #if NS_TIMER_SWITCH |
| mrs x10, cntp_ctl_el0 |
| mrs x11, cntp_cval_el0 |
| stp x10, x11, [x0, #CTX_CNTP_CTL_EL0] |
| |
| mrs x12, cntv_ctl_el0 |
| mrs x13, cntv_cval_el0 |
| stp x12, x13, [x0, #CTX_CNTV_CTL_EL0] |
| |
| mrs x14, cntkctl_el1 |
| str x14, [x0, #CTX_CNTKCTL_EL1] |
| #endif |
| |
| /* Save MTE system registers if the build has instructed so */ |
| #if CTX_INCLUDE_MTE_REGS |
| mrs x15, TFSRE0_EL1 |
| mrs x16, TFSR_EL1 |
| stp x15, x16, [x0, #CTX_TFSRE0_EL1] |
| |
| mrs x9, RGSR_EL1 |
| mrs x10, GCR_EL1 |
| stp x9, x10, [x0, #CTX_RGSR_EL1] |
| #endif |
| |
| ret |
| endfunc el1_sysregs_context_save |
| |
| /* ------------------------------------------------------------------ |
| * The following function strictly follows the AArch64 PCS to use |
| * x9-x17 (temporary caller-saved registers) to restore EL1 system |
| * register context. It assumes that 'x0' is pointing to a |
| * 'el1_sys_regs' structure from where the register context will be |
| * restored |
| * ------------------------------------------------------------------ |
| */ |
| func el1_sysregs_context_restore |
| |
| ldp x9, x10, [x0, #CTX_SPSR_EL1] |
| msr spsr_el1, x9 |
| msr elr_el1, x10 |
| |
| #if !ERRATA_SPECULATIVE_AT |
| ldp x15, x16, [x0, #CTX_SCTLR_EL1] |
| msr sctlr_el1, x15 |
| msr tcr_el1, x16 |
| #endif |
| |
| ldp x17, x9, [x0, #CTX_CPACR_EL1] |
| msr cpacr_el1, x17 |
| msr csselr_el1, x9 |
| |
| ldp x10, x11, [x0, #CTX_SP_EL1] |
| msr sp_el1, x10 |
| msr esr_el1, x11 |
| |
| ldp x12, x13, [x0, #CTX_TTBR0_EL1] |
| msr ttbr0_el1, x12 |
| msr ttbr1_el1, x13 |
| |
| ldp x14, x15, [x0, #CTX_MAIR_EL1] |
| msr mair_el1, x14 |
| msr amair_el1, x15 |
| |
| ldp x16, x17, [x0, #CTX_ACTLR_EL1] |
| msr actlr_el1, x16 |
| msr tpidr_el1, x17 |
| |
| ldp x9, x10, [x0, #CTX_TPIDR_EL0] |
| msr tpidr_el0, x9 |
| msr tpidrro_el0, x10 |
| |
| ldp x13, x14, [x0, #CTX_PAR_EL1] |
| msr par_el1, x13 |
| msr far_el1, x14 |
| |
| ldp x15, x16, [x0, #CTX_AFSR0_EL1] |
| msr afsr0_el1, x15 |
| msr afsr1_el1, x16 |
| |
| ldp x17, x9, [x0, #CTX_CONTEXTIDR_EL1] |
| msr contextidr_el1, x17 |
| msr vbar_el1, x9 |
| |
| /* Restore AArch32 system registers if the build has instructed so */ |
| #if CTX_INCLUDE_AARCH32_REGS |
| ldp x11, x12, [x0, #CTX_SPSR_ABT] |
| msr spsr_abt, x11 |
| msr spsr_und, x12 |
| |
| ldp x13, x14, [x0, #CTX_SPSR_IRQ] |
| msr spsr_irq, x13 |
| msr spsr_fiq, x14 |
| |
| ldp x15, x16, [x0, #CTX_DACR32_EL2] |
| msr dacr32_el2, x15 |
| msr ifsr32_el2, x16 |
| #endif |
| /* Restore NS timer registers if the build has instructed so */ |
| #if NS_TIMER_SWITCH |
| ldp x10, x11, [x0, #CTX_CNTP_CTL_EL0] |
| msr cntp_ctl_el0, x10 |
| msr cntp_cval_el0, x11 |
| |
| ldp x12, x13, [x0, #CTX_CNTV_CTL_EL0] |
| msr cntv_ctl_el0, x12 |
| msr cntv_cval_el0, x13 |
| |
| ldr x14, [x0, #CTX_CNTKCTL_EL1] |
| msr cntkctl_el1, x14 |
| #endif |
| /* Restore MTE system registers if the build has instructed so */ |
| #if CTX_INCLUDE_MTE_REGS |
| ldp x11, x12, [x0, #CTX_TFSRE0_EL1] |
| msr TFSRE0_EL1, x11 |
| msr TFSR_EL1, x12 |
| |
| ldp x13, x14, [x0, #CTX_RGSR_EL1] |
| msr RGSR_EL1, x13 |
| msr GCR_EL1, x14 |
| #endif |
| |
| /* No explict ISB required here as ERET covers it */ |
| ret |
| endfunc el1_sysregs_context_restore |
| |
| /* ------------------------------------------------------------------ |
| * The following function follows the aapcs_64 strictly to use |
| * x9-x17 (temporary caller-saved registers according to AArch64 PCS) |
| * to save floating point register context. It assumes that 'x0' is |
| * pointing to a 'fp_regs' structure where the register context will |
| * be saved. |
| * |
| * Access to VFP registers will trap if CPTR_EL3.TFP is set. |
| * However currently we don't use VFP registers nor set traps in |
| * Trusted Firmware, and assume it's cleared. |
| * |
| * TODO: Revisit when VFP is used in secure world |
| * ------------------------------------------------------------------ |
| */ |
| #if CTX_INCLUDE_FPREGS |
| func fpregs_context_save |
| stp q0, q1, [x0, #CTX_FP_Q0] |
| stp q2, q3, [x0, #CTX_FP_Q2] |
| stp q4, q5, [x0, #CTX_FP_Q4] |
| stp q6, q7, [x0, #CTX_FP_Q6] |
| stp q8, q9, [x0, #CTX_FP_Q8] |
| stp q10, q11, [x0, #CTX_FP_Q10] |
| stp q12, q13, [x0, #CTX_FP_Q12] |
| stp q14, q15, [x0, #CTX_FP_Q14] |
| stp q16, q17, [x0, #CTX_FP_Q16] |
| stp q18, q19, [x0, #CTX_FP_Q18] |
| stp q20, q21, [x0, #CTX_FP_Q20] |
| stp q22, q23, [x0, #CTX_FP_Q22] |
| stp q24, q25, [x0, #CTX_FP_Q24] |
| stp q26, q27, [x0, #CTX_FP_Q26] |
| stp q28, q29, [x0, #CTX_FP_Q28] |
| stp q30, q31, [x0, #CTX_FP_Q30] |
| |
| mrs x9, fpsr |
| str x9, [x0, #CTX_FP_FPSR] |
| |
| mrs x10, fpcr |
| str x10, [x0, #CTX_FP_FPCR] |
| |
| #if CTX_INCLUDE_AARCH32_REGS |
| mrs x11, fpexc32_el2 |
| str x11, [x0, #CTX_FP_FPEXC32_EL2] |
| #endif |
| ret |
| endfunc fpregs_context_save |
| |
| /* ------------------------------------------------------------------ |
| * The following function follows the aapcs_64 strictly to use x9-x17 |
| * (temporary caller-saved registers according to AArch64 PCS) to |
| * restore floating point register context. It assumes that 'x0' is |
| * pointing to a 'fp_regs' structure from where the register context |
| * will be restored. |
| * |
| * Access to VFP registers will trap if CPTR_EL3.TFP is set. |
| * However currently we don't use VFP registers nor set traps in |
| * Trusted Firmware, and assume it's cleared. |
| * |
| * TODO: Revisit when VFP is used in secure world |
| * ------------------------------------------------------------------ |
| */ |
| func fpregs_context_restore |
| ldp q0, q1, [x0, #CTX_FP_Q0] |
| ldp q2, q3, [x0, #CTX_FP_Q2] |
| ldp q4, q5, [x0, #CTX_FP_Q4] |
| ldp q6, q7, [x0, #CTX_FP_Q6] |
| ldp q8, q9, [x0, #CTX_FP_Q8] |
| ldp q10, q11, [x0, #CTX_FP_Q10] |
| ldp q12, q13, [x0, #CTX_FP_Q12] |
| ldp q14, q15, [x0, #CTX_FP_Q14] |
| ldp q16, q17, [x0, #CTX_FP_Q16] |
| ldp q18, q19, [x0, #CTX_FP_Q18] |
| ldp q20, q21, [x0, #CTX_FP_Q20] |
| ldp q22, q23, [x0, #CTX_FP_Q22] |
| ldp q24, q25, [x0, #CTX_FP_Q24] |
| ldp q26, q27, [x0, #CTX_FP_Q26] |
| ldp q28, q29, [x0, #CTX_FP_Q28] |
| ldp q30, q31, [x0, #CTX_FP_Q30] |
| |
| ldr x9, [x0, #CTX_FP_FPSR] |
| msr fpsr, x9 |
| |
| ldr x10, [x0, #CTX_FP_FPCR] |
| msr fpcr, x10 |
| |
| #if CTX_INCLUDE_AARCH32_REGS |
| ldr x11, [x0, #CTX_FP_FPEXC32_EL2] |
| msr fpexc32_el2, x11 |
| #endif |
| /* |
| * No explict ISB required here as ERET to |
| * switch to secure EL1 or non-secure world |
| * covers it |
| */ |
| |
| ret |
| endfunc fpregs_context_restore |
| #endif /* CTX_INCLUDE_FPREGS */ |
| |
| /* ------------------------------------------------------------------ |
| * The following function is used to save and restore all the general |
| * purpose and ARMv8.3-PAuth (if enabled) registers. |
| * It also checks if Secure Cycle Counter is not disabled in MDCR_EL3 |
| * when ARMv8.5-PMU is implemented, and if called from Non-secure |
| * state saves PMCR_EL0 and disables Cycle Counter. |
| * |
| * Ideally we would only save and restore the callee saved registers |
| * when a world switch occurs but that type of implementation is more |
| * complex. So currently we will always save and restore these |
| * registers on entry and exit of EL3. |
| * These are not macros to ensure their invocation fits within the 32 |
| * instructions per exception vector. |
| * clobbers: x18 |
| * ------------------------------------------------------------------ |
| */ |
| func save_gp_pmcr_pauth_regs |
| stp x0, x1, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X0] |
| stp x2, x3, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X2] |
| stp x4, x5, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X4] |
| stp x6, x7, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X6] |
| stp x8, x9, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X8] |
| stp x10, x11, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X10] |
| stp x12, x13, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X12] |
| stp x14, x15, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X14] |
| stp x16, x17, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X16] |
| stp x18, x19, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X18] |
| stp x20, x21, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X20] |
| stp x22, x23, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X22] |
| stp x24, x25, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X24] |
| stp x26, x27, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X26] |
| stp x28, x29, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X28] |
| mrs x18, sp_el0 |
| str x18, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_SP_EL0] |
| |
| /* ---------------------------------------------------------- |
| * Check if earlier initialization MDCR_EL3.SCCD to 1 failed, |
| * meaning that ARMv8-PMU is not implemented and PMCR_EL0 |
| * should be saved in non-secure context. |
| * ---------------------------------------------------------- |
| */ |
| mrs x9, mdcr_el3 |
| tst x9, #MDCR_SCCD_BIT |
| bne 1f |
| |
| /* Secure Cycle Counter is not disabled */ |
| mrs x9, pmcr_el0 |
| |
| /* Check caller's security state */ |
| mrs x10, scr_el3 |
| tst x10, #SCR_NS_BIT |
| beq 2f |
| |
| /* Save PMCR_EL0 if called from Non-secure state */ |
| str x9, [sp, #CTX_EL3STATE_OFFSET + CTX_PMCR_EL0] |
| |
| /* Disable cycle counter when event counting is prohibited */ |
| 2: orr x9, x9, #PMCR_EL0_DP_BIT |
| msr pmcr_el0, x9 |
| isb |
| 1: |
| #if CTX_INCLUDE_PAUTH_REGS |
| /* ---------------------------------------------------------- |
| * Save the ARMv8.3-PAuth keys as they are not banked |
| * by exception level |
| * ---------------------------------------------------------- |
| */ |
| add x19, sp, #CTX_PAUTH_REGS_OFFSET |
| |
| mrs x20, APIAKeyLo_EL1 /* x21:x20 = APIAKey */ |
| mrs x21, APIAKeyHi_EL1 |
| mrs x22, APIBKeyLo_EL1 /* x23:x22 = APIBKey */ |
| mrs x23, APIBKeyHi_EL1 |
| mrs x24, APDAKeyLo_EL1 /* x25:x24 = APDAKey */ |
| mrs x25, APDAKeyHi_EL1 |
| mrs x26, APDBKeyLo_EL1 /* x27:x26 = APDBKey */ |
| mrs x27, APDBKeyHi_EL1 |
| mrs x28, APGAKeyLo_EL1 /* x29:x28 = APGAKey */ |
| mrs x29, APGAKeyHi_EL1 |
| |
| stp x20, x21, [x19, #CTX_PACIAKEY_LO] |
| stp x22, x23, [x19, #CTX_PACIBKEY_LO] |
| stp x24, x25, [x19, #CTX_PACDAKEY_LO] |
| stp x26, x27, [x19, #CTX_PACDBKEY_LO] |
| stp x28, x29, [x19, #CTX_PACGAKEY_LO] |
| #endif /* CTX_INCLUDE_PAUTH_REGS */ |
| |
| ret |
| endfunc save_gp_pmcr_pauth_regs |
| |
| /* ------------------------------------------------------------------ |
| * This function restores ARMv8.3-PAuth (if enabled) and all general |
| * purpose registers except x30 from the CPU context. |
| * x30 register must be explicitly restored by the caller. |
| * ------------------------------------------------------------------ |
| */ |
| func restore_gp_pmcr_pauth_regs |
| #if CTX_INCLUDE_PAUTH_REGS |
| /* Restore the ARMv8.3 PAuth keys */ |
| add x10, sp, #CTX_PAUTH_REGS_OFFSET |
| |
| ldp x0, x1, [x10, #CTX_PACIAKEY_LO] /* x1:x0 = APIAKey */ |
| ldp x2, x3, [x10, #CTX_PACIBKEY_LO] /* x3:x2 = APIBKey */ |
| ldp x4, x5, [x10, #CTX_PACDAKEY_LO] /* x5:x4 = APDAKey */ |
| ldp x6, x7, [x10, #CTX_PACDBKEY_LO] /* x7:x6 = APDBKey */ |
| ldp x8, x9, [x10, #CTX_PACGAKEY_LO] /* x9:x8 = APGAKey */ |
| |
| msr APIAKeyLo_EL1, x0 |
| msr APIAKeyHi_EL1, x1 |
| msr APIBKeyLo_EL1, x2 |
| msr APIBKeyHi_EL1, x3 |
| msr APDAKeyLo_EL1, x4 |
| msr APDAKeyHi_EL1, x5 |
| msr APDBKeyLo_EL1, x6 |
| msr APDBKeyHi_EL1, x7 |
| msr APGAKeyLo_EL1, x8 |
| msr APGAKeyHi_EL1, x9 |
| #endif /* CTX_INCLUDE_PAUTH_REGS */ |
| |
| /* ---------------------------------------------------------- |
| * Restore PMCR_EL0 when returning to Non-secure state if |
| * Secure Cycle Counter is not disabled in MDCR_EL3 when |
| * ARMv8.5-PMU is implemented. |
| * ---------------------------------------------------------- |
| */ |
| mrs x0, scr_el3 |
| tst x0, #SCR_NS_BIT |
| beq 2f |
| |
| /* ---------------------------------------------------------- |
| * Back to Non-secure state. |
| * Check if earlier initialization MDCR_EL3.SCCD to 1 failed, |
| * meaning that ARMv8-PMU is not implemented and PMCR_EL0 |
| * should be restored from non-secure context. |
| * ---------------------------------------------------------- |
| */ |
| mrs x0, mdcr_el3 |
| tst x0, #MDCR_SCCD_BIT |
| bne 2f |
| ldr x0, [sp, #CTX_EL3STATE_OFFSET + CTX_PMCR_EL0] |
| msr pmcr_el0, x0 |
| 2: |
| ldp x0, x1, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X0] |
| ldp x2, x3, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X2] |
| ldp x4, x5, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X4] |
| ldp x6, x7, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X6] |
| ldp x8, x9, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X8] |
| ldp x10, x11, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X10] |
| ldp x12, x13, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X12] |
| ldp x14, x15, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X14] |
| ldp x16, x17, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X16] |
| ldp x18, x19, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X18] |
| ldp x20, x21, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X20] |
| ldp x22, x23, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X22] |
| ldp x24, x25, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X24] |
| ldp x26, x27, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X26] |
| ldr x28, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_SP_EL0] |
| msr sp_el0, x28 |
| ldp x28, x29, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_X28] |
| ret |
| endfunc restore_gp_pmcr_pauth_regs |
| |
| /* |
| * In case of ERRATA_SPECULATIVE_AT, save SCTLR_EL1 and TCR_EL1 |
| * registers and update EL1 registers to disable stage1 and stage2 |
| * page table walk |
| */ |
| func save_and_update_ptw_el1_sys_regs |
| /* ---------------------------------------------------------- |
| * Save only sctlr_el1 and tcr_el1 registers |
| * ---------------------------------------------------------- |
| */ |
| mrs x29, sctlr_el1 |
| str x29, [sp, #(CTX_EL1_SYSREGS_OFFSET + CTX_SCTLR_EL1)] |
| mrs x29, tcr_el1 |
| str x29, [sp, #(CTX_EL1_SYSREGS_OFFSET + CTX_TCR_EL1)] |
| |
| /* ------------------------------------------------------------ |
| * Must follow below order in order to disable page table |
| * walk for lower ELs (EL1 and EL0). First step ensures that |
| * page table walk is disabled for stage1 and second step |
| * ensures that page table walker should use TCR_EL1.EPDx |
| * bits to perform address translation. ISB ensures that CPU |
| * does these 2 steps in order. |
| * |
| * 1. Update TCR_EL1.EPDx bits to disable page table walk by |
| * stage1. |
| * 2. Enable MMU bit to avoid identity mapping via stage2 |
| * and force TCR_EL1.EPDx to be used by the page table |
| * walker. |
| * ------------------------------------------------------------ |
| */ |
| orr x29, x29, #(TCR_EPD0_BIT) |
| orr x29, x29, #(TCR_EPD1_BIT) |
| msr tcr_el1, x29 |
| isb |
| mrs x29, sctlr_el1 |
| orr x29, x29, #SCTLR_M_BIT |
| msr sctlr_el1, x29 |
| isb |
| |
| ret |
| endfunc save_and_update_ptw_el1_sys_regs |
| |
| /* ------------------------------------------------------------------ |
| * This routine assumes that the SP_EL3 is pointing to a valid |
| * context structure from where the gp regs and other special |
| * registers can be retrieved. |
| * ------------------------------------------------------------------ |
| */ |
| func el3_exit |
| #if ENABLE_ASSERTIONS |
| /* el3_exit assumes SP_EL0 on entry */ |
| mrs x17, spsel |
| cmp x17, #MODE_SP_EL0 |
| ASM_ASSERT(eq) |
| #endif |
| |
| /* ---------------------------------------------------------- |
| * Save the current SP_EL0 i.e. the EL3 runtime stack which |
| * will be used for handling the next SMC. |
| * Then switch to SP_EL3. |
| * ---------------------------------------------------------- |
| */ |
| mov x17, sp |
| 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 && DYNAMIC_WORKAROUND_CVE_2018_3639 |
| /* ---------------------------------------------------------- |
| * Restore mitigation state as it was on entry to EL3 |
| * ---------------------------------------------------------- |
| */ |
| ldr x17, [sp, #CTX_CVE_2018_3639_OFFSET + CTX_CVE_2018_3639_DISABLE] |
| cbz x17, 1f |
| blr x17 |
| 1: |
| #endif |
| 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 |
| * before exiting EL3. We're running with EAs unmasked, so |
| * any synchronized errors would be taken immediately; |
| * therefore no need to inspect DISR_EL1 register. |
| * ---------------------------------------------------------- |
| */ |
| esb |
| #else |
| dsb sy |
| #endif |
| #ifdef IMAGE_BL31 |
| str xzr, [sp, #CTX_EL3STATE_OFFSET + CTX_IS_IN_EL3] |
| #endif |
| exception_return |
| |
| endfunc el3_exit |