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Changes necessary to support SEPARATE_NOBITS_REGION feature

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Since BL31 PROGBITS and BL31 NOBITS sections are going to be
in non-adjacent memory regions, potentially far from each other,
some fixes are needed to support it completely.

1. adr instruction only allows computing the effective address
of a location only within 1MB range of the PC. However, adrp
instruction together with an add permits position independent
address of any location with 4GB range of PC.

2. Since BL31 _RW_END_ marks the end of BL31 image, care must be
taken that it is aligned to page size since we map this memory
region in BL31 using xlat_v2 lib utils which mandate alignment of
image size to page granularity.

Change-Id: I3451cc030d03cb2032db3cc088f0c0e2c84bffda
Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
This commit is contained in:
Madhukar Pappireddy 2020-01-27 15:32:15 -06:00
parent 9054018bd5
commit c367b75e85
4 changed files with 17 additions and 10 deletions
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14
bl31/aarch64/bl31_entrypoint.S
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2013-2020, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -110,13 +110,17 @@ func bl31_entrypoint
* caches and participate in coherency.
* --------------------------------------------------------------------
*/
adr x0, __DATA_START__
adr x1, __DATA_END__
adrp x0, __DATA_START__
add x0, x0, :lo12:__DATA_START__
adrp x1, __DATA_END__
add x1, x1, :lo12:__DATA_END__
sub x1, x1, x0
bl clean_dcache_range
adr x0, __BSS_START__
adr x1, __BSS_END__
adrp x0, __BSS_START__
add x0, x0, :lo12:__BSS_START__
adrp x1, __BSS_END__
add x1, x1, :lo12:__BSS_END__
sub x1, x1, x0
bl clean_dcache_range

5
bl31/aarch64/runtime_exceptions.S
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2013-2020, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -414,7 +414,8 @@ smc_handler64:
orr x16, x16, x15, lsl #FUNCID_OEN_WIDTH
/* Load descriptor index from array of indices */
adr x14, rt_svc_descs_indices
adrp x14, rt_svc_descs_indices
add x14, x14, :lo12:rt_svc_descs_indices
ldrb w15, [x14, x16]
/* Any index greater than 127 is invalid. Check bit 7. */

3
bl31/bl31.ld.S
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2013-2020, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -208,6 +208,7 @@ SECTIONS
* Define a linker symbol to mark end of the RW memory area for this
* image.
*/
. = ALIGN(PAGE_SIZE);
__RW_END__ = .;
__BL31_END__ = .;

5
lib/el3_runtime/aarch64/cpu_data.S
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2014-2020, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -41,7 +41,8 @@ endfunc init_cpu_data_ptr
func _cpu_data_by_index
mov_imm x1, CPU_DATA_SIZE
mul x0, x0, x1
adr x1, percpu_data
adrp x1, percpu_data
add x1, x1, :lo12:percpu_data
add x0, x0, x1
ret
endfunc _cpu_data_by_index