| /* |
| * Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <arch.h> |
| #include <asm_macros.S> |
| #include <context.h> |
| |
| .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_registers |
| .global restore_gp_registers |
| .global restore_gp_registers_eret |
| .global el3_exit |
| |
| /* ----------------------------------------------------- |
| * 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] |
| |
| mrs x15, sctlr_el1 |
| mrs x16, actlr_el1 |
| stp x15, x16, [x0, #CTX_SCTLR_EL1] |
| |
| 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, tcr_el1 |
| mrs x17, tpidr_el1 |
| stp x16, x17, [x0, #CTX_TCR_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] |
| |
| mrs x10, pmcr_el0 |
| str x10, [x0, #CTX_PMCR_EL0] |
| |
| /* 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 |
| |
| 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 |
| |
| ldp x15, x16, [x0, #CTX_SCTLR_EL1] |
| msr sctlr_el1, x15 |
| msr actlr_el1, x16 |
| |
| 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_TCR_EL1] |
| msr tcr_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 |
| |
| ldr x10, [x0, #CTX_PMCR_EL0] |
| msr pmcr_el0, x10 |
| |
| /* 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 |
| |
| /* 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 functions are used to save and restore |
| * all the general purpose registers. 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_registers |
| 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] |
| ret |
| endfunc save_gp_registers |
| |
| /* ----------------------------------------------------- |
| * This function restores all general purpose registers except x30 from the |
| * CPU context. x30 register must be explicitly restored by the caller. |
| * ----------------------------------------------------- |
| */ |
| func restore_gp_registers |
| 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_registers |
| |
| /* ----------------------------------------------------- |
| * Restore general purpose registers (including x30), and exit EL3 via. ERET to |
| * a lower exception level. |
| * ----------------------------------------------------- |
| */ |
| func restore_gp_registers_eret |
| bl restore_gp_registers |
| 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 |
| #endif |
| eret |
| endfunc restore_gp_registers_eret |
| |
| /* ----------------------------------------------------- |
| * 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 |
| /* ----------------------------------------------------- |
| * 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, #1 |
| 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] |
| cmp x17, xzr |
| beq 1f |
| blr x17 |
| 1: |
| #endif |
| |
| /* Restore saved general purpose registers and return */ |
| b restore_gp_registers_eret |
| endfunc el3_exit |