diff options
Diffstat (limited to 'src/vendorcode/amd/fsp/picasso/bl_uapp/bl_uapp_startup.S')
| -rw-r--r-- | src/vendorcode/amd/fsp/picasso/bl_uapp/bl_uapp_startup.S | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/src/vendorcode/amd/fsp/picasso/bl_uapp/bl_uapp_startup.S b/src/vendorcode/amd/fsp/picasso/bl_uapp/bl_uapp_startup.S new file mode 100644 index 0000000000..88bbf7e98a --- /dev/null +++ b/src/vendorcode/amd/fsp/picasso/bl_uapp/bl_uapp_startup.S @@ -0,0 +1,105 @@ +/***************************************************************************** + * + * 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_UAPP_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_UAPP_ERR_GENERIC + svc #0x0 // SVC_EXIT + +ret: + pop {r3,pc} + +ENDPROC(AllocateStack) +.end |