arm-trusted-firmware/bl1/aarch32/bl1_exceptions.S

97 lines
3.1 KiB
ArmAsm

/*
* Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <arch.h>
#include <asm_macros.S>
#include <bl1.h>
#include <bl_common.h>
.globl bl1_aarch32_smc_handler
func bl1_aarch32_smc_handler
/* ------------------------------------------------
* SMC in BL1 is handled assuming that the MMU is
* turned off by BL2.
* ------------------------------------------------
*/
/* ----------------------------------------------
* Only RUN_IMAGE SMC is supported.
* ----------------------------------------------
*/
mov r8, #BL1_SMC_RUN_IMAGE
cmp r8, r0
blne report_exception
/* ------------------------------------------------
* Make sure only Secure world reaches here.
* ------------------------------------------------
*/
ldcopr r8, SCR
tst r8, #SCR_NS_BIT
blne report_exception
/* ---------------------------------------------------------------------
* Pass control to next secure image.
* Here it expects r1 to contain the address of a entry_point_info_t
* structure describing the BL entrypoint.
* ---------------------------------------------------------------------
*/
mov r8, r1
mov r0, r1
bl bl1_print_next_bl_ep_info
#if SPIN_ON_BL1_EXIT
bl print_debug_loop_message
debug_loop:
b debug_loop
#endif
mov r0, r8
bl bl1_plat_prepare_exit
stcopr r0, TLBIALL
dsb sy
isb
/*
* Extract PC and SPSR based on struct `entry_point_info_t`
* and load it in LR and SPSR registers respectively.
*/
ldr lr, [r8, #ENTRY_POINT_INFO_PC_OFFSET]
ldr r1, [r8, #(ENTRY_POINT_INFO_PC_OFFSET + 4)]
msr spsr, r1
add r8, r8, #ENTRY_POINT_INFO_ARGS_OFFSET
ldm r8, {r0, r1, r2, r3}
eret
endfunc bl1_aarch32_smc_handler