mirror of
https://github.com/ARM-software/arm-trusted-firmware.git
synced 2025-04-17 10:04:26 +00:00
8cec598ba3
The current code does not always use data and instruction barriers as required by the architecture and frequently uses barriers excessively due to their inclusion in all of the write_*() helper functions. Barriers should be used explicitly in assembler or C code when modifying processor state that requires the barriers in order to enable review of correctness of the code. This patch removes the barriers from the helper functions and introduces them as necessary elsewhere in the code. PORTING NOTE: check any port of Trusted Firmware for use of system register helper functions for reliance on the previous barrier behaviour and add explicit barriers as necessary. Fixes ARM-software/tf-issues#92 Change-Id: Ie63e187404ff10e0bdcb39292dd9066cb84c53bf
238 lines
5.8 KiB
ArmAsm
238 lines
5.8 KiB
ArmAsm
/*
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* Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <arch.h>
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#include <asm_macros.S>
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#include <bl_common.h>
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#include <runtime_svc.h>
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.globl bl1_exceptions
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.section .vectors, "ax"; .align 11
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/* -----------------------------------------------------
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* Very simple stackless exception handlers used by BL1.
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* -----------------------------------------------------
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*/
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.align 7
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bl1_exceptions:
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/* -----------------------------------------------------
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* Current EL with SP0 : 0x0 - 0x180
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* -----------------------------------------------------
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*/
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SynchronousExceptionSP0:
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mov x0, #SYNC_EXCEPTION_SP_EL0
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bl plat_report_exception
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b SynchronousExceptionSP0
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check_vector_size SynchronousExceptionSP0
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.align 7
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IrqSP0:
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mov x0, #IRQ_SP_EL0
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bl plat_report_exception
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b IrqSP0
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check_vector_size IrqSP0
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.align 7
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FiqSP0:
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mov x0, #FIQ_SP_EL0
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bl plat_report_exception
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b FiqSP0
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check_vector_size FiqSP0
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.align 7
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SErrorSP0:
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mov x0, #SERROR_SP_EL0
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bl plat_report_exception
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b SErrorSP0
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check_vector_size SErrorSP0
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/* -----------------------------------------------------
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* Current EL with SPx: 0x200 - 0x380
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* -----------------------------------------------------
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*/
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.align 7
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SynchronousExceptionSPx:
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mov x0, #SYNC_EXCEPTION_SP_ELX
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bl plat_report_exception
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b SynchronousExceptionSPx
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check_vector_size SynchronousExceptionSPx
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.align 7
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IrqSPx:
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mov x0, #IRQ_SP_ELX
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bl plat_report_exception
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b IrqSPx
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check_vector_size IrqSPx
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.align 7
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FiqSPx:
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mov x0, #FIQ_SP_ELX
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bl plat_report_exception
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b FiqSPx
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check_vector_size FiqSPx
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.align 7
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SErrorSPx:
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mov x0, #SERROR_SP_ELX
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bl plat_report_exception
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b SErrorSPx
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check_vector_size SErrorSPx
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/* -----------------------------------------------------
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* Lower EL using AArch64 : 0x400 - 0x580
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* -----------------------------------------------------
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*/
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.align 7
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SynchronousExceptionA64:
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/* ---------------------------------------------
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* Only a single SMC exception from BL2 to ask
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* BL1 to pass EL3 control to BL31 is expected
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* here.
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* ---------------------------------------------
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*/
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b process_exception
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check_vector_size SynchronousExceptionA64
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.align 7
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IrqA64:
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mov x0, #IRQ_AARCH64
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bl plat_report_exception
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b IrqA64
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check_vector_size IrqA64
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.align 7
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FiqA64:
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mov x0, #FIQ_AARCH64
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bl plat_report_exception
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b FiqA64
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check_vector_size FiqA64
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.align 7
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SErrorA64:
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mov x0, #SERROR_AARCH64
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bl plat_report_exception
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b SErrorA64
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check_vector_size SErrorA64
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/* -----------------------------------------------------
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* Lower EL using AArch32 : 0x0 - 0x180
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* -----------------------------------------------------
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*/
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.align 7
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SynchronousExceptionA32:
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mov x0, #SYNC_EXCEPTION_AARCH32
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bl plat_report_exception
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b SynchronousExceptionA32
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check_vector_size SynchronousExceptionA32
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.align 7
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IrqA32:
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mov x0, #IRQ_AARCH32
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bl plat_report_exception
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b IrqA32
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check_vector_size IrqA32
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.align 7
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FiqA32:
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mov x0, #FIQ_AARCH32
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bl plat_report_exception
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b FiqA32
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check_vector_size FiqA32
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.align 7
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SErrorA32:
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mov x0, #SERROR_AARCH32
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bl plat_report_exception
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b SErrorA32
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check_vector_size SErrorA32
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.align 7
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func process_exception
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sub sp, sp, #0x40
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stp x0, x1, [sp, #0x0]
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stp x2, x3, [sp, #0x10]
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stp x4, x5, [sp, #0x20]
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stp x6, x7, [sp, #0x30]
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mov x19, x0
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mov x20, x1
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mov x21, x2
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mov x0, #SYNC_EXCEPTION_AARCH64
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bl plat_report_exception
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bl read_esr_el3
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ubfx x1, x0, #ESR_EC_SHIFT, #ESR_EC_LENGTH
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cmp x1, #EC_AARCH64_SMC
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b.ne panic
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mov x1, #RUN_IMAGE
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cmp x19, x1
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b.ne panic
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mov x0, x20
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mov x1, x21
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mov x2, x3
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mov x3, x4
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bl display_boot_progress
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mov x0, x20
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bl write_elr
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mov x0, x21
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bl write_spsr
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ubfx x0, x21, #MODE_EL_SHIFT, #2
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cmp x0, #MODE_EL3
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b.ne skip_mmu_teardown
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/* ---------------------------------------------
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* If BL31 is to be executed in EL3 as well
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* then turn off the MMU so that it can perform
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* its own setup. TODO: Assuming flat mapped
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* translations here. Also all should go into a
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* separate MMU teardown function
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* ---------------------------------------------
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*/
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mov x1, #(SCTLR_M_BIT | SCTLR_C_BIT | SCTLR_I_BIT)
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bl read_sctlr_el3
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bic x0, x0, x1
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bl write_sctlr_el3
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isb
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mov x0, #DCCISW
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bl dcsw_op_all
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bl tlbialle3
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skip_mmu_teardown:
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ldp x6, x7, [sp, #0x30]
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ldp x4, x5, [sp, #0x20]
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ldp x2, x3, [sp, #0x10]
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ldp x0, x1, [sp, #0x0]
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add sp, sp, #0x40
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eret
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panic:
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wfi
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b panic
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