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/*****************************************************************************
*
* Copyright (c) 2019, Advanced Micro Devices, Inc.
* 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 Advanced Micro Devices, Inc. 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 ADVANCED MICRO DEVICES, INC. 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/asm.h>
#include <bl_uapp/bl_errorcodes_public.h>
.global Main
.global _psp_vs_start
.global PSP_VERSTAGE_STACK_BASE
.global PSP_VERSTAGE_STACK_END
.global PSP_VERSTAGE_TEMP_STACK_END
.arm
.text
.section "PSP_HEADER_DATA", "aw", %note
//==============================================================================
// First 256 bytes of the binary image contain the header.
// Executable code starts from offset 0x100.
//==============================================================================
#include "bl_uapp_header.inc"
//==============================================================================
// This is entry point to the binary which is called by main Boot Loader.
//==============================================================================
ENTRY(_psp_vs_start)
// Map Debug Unlock stack to separate Virtual Address so that stack
// overflow cause exception instead of data corruption.
//
ldr sp, =PSP_VERSTAGE_TEMP_STACK_END // temporary stack pointer
ldr r2, =AllocateStack
blx r2
// Return value contains Virtual Address of mapped stack
//
mov sp, r0 // set OEM PSP BL user app stack pointer
ldr lr, =ShouldNotBeReached // return address
ldr r2, =Main // pass control to verstage main function
blx r2
// This point should not be reached. The Main() function should return
// to main BL using Svc_Exit().
//
ShouldNotBeReached:
mov r0, #BL_ERR_GENERIC // Returned from Main
svc #0x0 // SVC_EXIT
ENDPROC(_psp_vs_start)
//==============================================================================
// Code to allocate an address space for stack
//==============================================================================
.global AllocateStack
ENTRY(AllocateStack)
push {r3,lr}
ldr r0, =PSP_VERSTAGE_STACK_BASE
mov r2, sp
ldr r1, =PSP_VERSTAGE_STACK_END
svc #0x1 // 0x1 is the SvcID for SVC_MAP_USER_STACK
cmp r0, #0
bne svcExit
ldr r0,[sp,#0]
cmp r0, #0 // r0 contains the virtual stack address
bne ret
svcExit:
mov r0, #BL_ERR_GENERIC
svc #0x0 // SVC_EXIT
ret:
pop {r3,pc}
ENDPROC(AllocateStack)
.end
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