| /* |
| * Copyright (c) 2013-2016, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <arch.h> |
| #include <asm_macros.S> |
| #include <bl1.h> |
| #include <bl_common.h> |
| #include <context.h> |
| |
| /* ----------------------------------------------------------------------------- |
| * Very simple stackless exception handlers used by BL1. |
| * ----------------------------------------------------------------------------- |
| */ |
| .globl bl1_exceptions |
| |
| vector_base bl1_exceptions |
| |
| /* ----------------------------------------------------- |
| * Current EL with SP0 : 0x0 - 0x200 |
| * ----------------------------------------------------- |
| */ |
| vector_entry SynchronousExceptionSP0 |
| mov x0, #SYNC_EXCEPTION_SP_EL0 |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| check_vector_size SynchronousExceptionSP0 |
| |
| vector_entry IrqSP0 |
| mov x0, #IRQ_SP_EL0 |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| check_vector_size IrqSP0 |
| |
| vector_entry FiqSP0 |
| mov x0, #FIQ_SP_EL0 |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| check_vector_size FiqSP0 |
| |
| vector_entry SErrorSP0 |
| mov x0, #SERROR_SP_EL0 |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| check_vector_size SErrorSP0 |
| |
| /* ----------------------------------------------------- |
| * Current EL with SPx: 0x200 - 0x400 |
| * ----------------------------------------------------- |
| */ |
| vector_entry SynchronousExceptionSPx |
| mov x0, #SYNC_EXCEPTION_SP_ELX |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| check_vector_size SynchronousExceptionSPx |
| |
| vector_entry IrqSPx |
| mov x0, #IRQ_SP_ELX |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| check_vector_size IrqSPx |
| |
| vector_entry FiqSPx |
| mov x0, #FIQ_SP_ELX |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| check_vector_size FiqSPx |
| |
| vector_entry SErrorSPx |
| mov x0, #SERROR_SP_ELX |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| check_vector_size SErrorSPx |
| |
| /* ----------------------------------------------------- |
| * Lower EL using AArch64 : 0x400 - 0x600 |
| * ----------------------------------------------------- |
| */ |
| vector_entry SynchronousExceptionA64 |
| /* Enable the SError interrupt */ |
| msr daifclr, #DAIF_ABT_BIT |
| |
| str x30, [sp, #CTX_GPREGS_OFFSET + CTX_GPREG_LR] |
| |
| /* Expect only SMC exceptions */ |
| mrs x30, esr_el3 |
| ubfx x30, x30, #ESR_EC_SHIFT, #ESR_EC_LENGTH |
| cmp x30, #EC_AARCH64_SMC |
| b.ne unexpected_sync_exception |
| |
| b smc_handler64 |
| check_vector_size SynchronousExceptionA64 |
| |
| vector_entry IrqA64 |
| mov x0, #IRQ_AARCH64 |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| check_vector_size IrqA64 |
| |
| vector_entry FiqA64 |
| mov x0, #FIQ_AARCH64 |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| check_vector_size FiqA64 |
| |
| vector_entry SErrorA64 |
| mov x0, #SERROR_AARCH64 |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| check_vector_size SErrorA64 |
| |
| /* ----------------------------------------------------- |
| * Lower EL using AArch32 : 0x600 - 0x800 |
| * ----------------------------------------------------- |
| */ |
| vector_entry SynchronousExceptionA32 |
| mov x0, #SYNC_EXCEPTION_AARCH32 |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| check_vector_size SynchronousExceptionA32 |
| |
| vector_entry IrqA32 |
| mov x0, #IRQ_AARCH32 |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| check_vector_size IrqA32 |
| |
| vector_entry FiqA32 |
| mov x0, #FIQ_AARCH32 |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| check_vector_size FiqA32 |
| |
| vector_entry SErrorA32 |
| mov x0, #SERROR_AARCH32 |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| check_vector_size SErrorA32 |
| |
| |
| func smc_handler64 |
| |
| /* ---------------------------------------------- |
| * Detect if this is a RUN_IMAGE or other SMC. |
| * ---------------------------------------------- |
| */ |
| mov x30, #BL1_SMC_RUN_IMAGE |
| cmp x30, x0 |
| b.ne smc_handler |
| |
| /* ------------------------------------------------ |
| * Make sure only Secure world reaches here. |
| * ------------------------------------------------ |
| */ |
| mrs x30, scr_el3 |
| tst x30, #SCR_NS_BIT |
| b.ne unexpected_sync_exception |
| |
| /* ---------------------------------------------- |
| * Handling RUN_IMAGE SMC. First switch back to |
| * SP_EL0 for the C runtime stack. |
| * ---------------------------------------------- |
| */ |
| ldr x30, [sp, #CTX_EL3STATE_OFFSET + CTX_RUNTIME_SP] |
| msr spsel, #0 |
| mov sp, x30 |
| |
| /* --------------------------------------------------------------------- |
| * Pass EL3 control to next BL image. |
| * Here it expects X1 with the address of a entry_point_info_t |
| * structure describing the next BL image entrypoint. |
| * --------------------------------------------------------------------- |
| */ |
| mov x20, x1 |
| |
| mov x0, x20 |
| bl bl1_print_next_bl_ep_info |
| |
| ldp x0, x1, [x20, #ENTRY_POINT_INFO_PC_OFFSET] |
| msr elr_el3, x0 |
| msr spsr_el3, x1 |
| ubfx x0, x1, #MODE_EL_SHIFT, #2 |
| cmp x0, #MODE_EL3 |
| b.ne unexpected_sync_exception |
| |
| bl disable_mmu_icache_el3 |
| tlbi alle3 |
| |
| #if SPIN_ON_BL1_EXIT |
| bl print_debug_loop_message |
| debug_loop: |
| b debug_loop |
| #endif |
| |
| mov x0, x20 |
| bl bl1_plat_prepare_exit |
| |
| ldp x6, x7, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x30)] |
| ldp x4, x5, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x20)] |
| ldp x2, x3, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x10)] |
| ldp x0, x1, [x20, #(ENTRY_POINT_INFO_ARGS_OFFSET + 0x0)] |
| eret |
| endfunc smc_handler64 |
| |
| unexpected_sync_exception: |
| mov x0, #SYNC_EXCEPTION_AARCH64 |
| bl plat_report_exception |
| no_ret plat_panic_handler |
| |
| /* ----------------------------------------------------- |
| * Save Secure/Normal world context and jump to |
| * BL1 SMC handler. |
| * ----------------------------------------------------- |
| */ |
| smc_handler: |
| /* ----------------------------------------------------- |
| * Save the GP registers x0-x29. |
| * TODO: Revisit to store only SMCC specified registers. |
| * ----------------------------------------------------- |
| */ |
| bl save_gp_registers |
| |
| /* ----------------------------------------------------- |
| * Populate the parameters for the SMC handler. We |
| * already have x0-x4 in place. x5 will point to a |
| * cookie (not used now). x6 will point to the context |
| * structure (SP_EL3) and x7 will contain flags we need |
| * to pass to the handler. |
| * ----------------------------------------------------- |
| */ |
| mov x5, xzr |
| mov x6, sp |
| |
| /* ----------------------------------------------------- |
| * Restore the saved C runtime stack value which will |
| * become the new SP_EL0 i.e. EL3 runtime stack. It was |
| * saved in the 'cpu_context' structure prior to the last |
| * ERET from EL3. |
| * ----------------------------------------------------- |
| */ |
| ldr x12, [x6, #CTX_EL3STATE_OFFSET + CTX_RUNTIME_SP] |
| |
| /* --------------------------------------------- |
| * Switch back to SP_EL0 for the C runtime stack. |
| * --------------------------------------------- |
| */ |
| msr spsel, #0 |
| mov sp, x12 |
| |
| /* ----------------------------------------------------- |
| * Save the SPSR_EL3, ELR_EL3, & SCR_EL3 in case there |
| * is a world switch during SMC handling. |
| * ----------------------------------------------------- |
| */ |
| mrs x16, spsr_el3 |
| mrs x17, elr_el3 |
| mrs x18, scr_el3 |
| stp x16, x17, [x6, #CTX_EL3STATE_OFFSET + CTX_SPSR_EL3] |
| str x18, [x6, #CTX_EL3STATE_OFFSET + CTX_SCR_EL3] |
| |
| /* Copy SCR_EL3.NS bit to the flag to indicate caller's security */ |
| bfi x7, x18, #0, #1 |
| |
| /* ----------------------------------------------------- |
| * Go to BL1 SMC handler. |
| * ----------------------------------------------------- |
| */ |
| bl bl1_smc_handler |
| |
| /* ----------------------------------------------------- |
| * Do the transition to next BL image. |
| * ----------------------------------------------------- |
| */ |
| b el3_exit |