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BL2: Enable pointer authentication support

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The size increase after enabling options related to ARMv8.3-PAuth is:

+----------------------------+-------+-------+-------+--------+
|                            |  text |  bss  |  data | rodata |
+----------------------------+-------+-------+-------+--------+
| CTX_INCLUDE_PAUTH_REGS = 1 |   +40 |   +0  |   +0  |   +0   |
|                            |  0.2% |       |       |        |
+----------------------------+-------+-------+-------+--------+
| ENABLE_PAUTH = 1           |  +664 |   +0  |  +16  |   +0   |
|                            |  3.1% |       |  0.9% |        |
+----------------------------+-------+-------+-------+--------+

Results calculated with the following build configuration:

    make PLAT=fvp SPD=tspd DEBUG=1 \
    SDEI_SUPPORT=1                 \
    EL3_EXCEPTION_HANDLING=1       \
    TSP_NS_INTR_ASYNC_PREEMPT=1    \
    CTX_INCLUDE_PAUTH_REGS=1       \
    ENABLE_PAUTH=1

The changes for BL2_AT_EL3 aren't done in this commit.

Change-Id: I8c803b40c7160525a06173bc6cdca21c4505837d
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
This commit is contained in:
Antonio Nino Diaz 2019-01-31 10:48:47 +00:00
parent cd7d6b0eb1
commit 9d93fc2f89
5 changed files with 52 additions and 15 deletions
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9
bl2/aarch32/bl2_entrypoint.S
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2016-2018, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2016-2019, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -108,16 +108,15 @@ func bl2_entrypoint
#endif
/* ---------------------------------------------
* Perform early platform setup & platform
* specific early arch. setup e.g. mmu setup
* Perform BL2 setup
* ---------------------------------------------
*/
mov r0, r9
mov r1, r10
mov r2, r11
mov r3, r12
bl bl2_early_platform_setup2
bl bl2_plat_arch_setup
bl bl2_setup
/* ---------------------------------------------
* Jump to main function.

18
bl2/aarch64/bl2_entrypoint.S
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -106,17 +106,25 @@ func bl2_entrypoint
#endif
/* ---------------------------------------------
* Perform early platform setup & platform
* specific early arch. setup e.g. mmu setup
* Perform BL2 setup
* ---------------------------------------------
*/
mov x0, x20
mov x1, x21
mov x2, x22
mov x3, x23
bl bl2_early_platform_setup2
bl bl2_setup
bl bl2_plat_arch_setup
/* ---------------------------------------------
* Enable pointer authentication
* ---------------------------------------------
*/
#if ENABLE_PAUTH
mrs x0, sctlr_el1
orr x0, x0, #SCTLR_EnIA_BIT
msr sctlr_el1, x0
isb
#endif /* ENABLE_PAUTH */
/* ---------------------------------------------
* Jump to main function.

9
bl2/bl2.mk
View file

@ -1,10 +1,11 @@
#
# Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
# Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
#
BL2_SOURCES += bl2/bl2_main.c \
BL2_SOURCES += bl2/bl2_image_load_v2.c \
bl2/bl2_main.c \
bl2/${ARCH}/bl2_arch_setup.c \
lib/locks/exclusive/${ARCH}/spinlock.S \
plat/common/${ARCH}/platform_up_stack.S \
@ -14,7 +15,9 @@ ifeq (${ARCH},aarch64)
BL2_SOURCES += common/aarch64/early_exceptions.S
endif
BL2_SOURCES += bl2/bl2_image_load_v2.c
ifeq (${ENABLE_PAUTH},1)
BL2_CFLAGS += -msign-return-address=non-leaf
endif
ifeq (${BL2_AT_EL3},0)
BL2_SOURCES += bl2/${ARCH}/bl2_entrypoint.S

25
bl2/bl2_main.c
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -21,6 +21,29 @@
#define NEXT_IMAGE "BL31"
#endif
/*******************************************************************************
* Setup function for BL2.
******************************************************************************/
void bl2_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2,
u_register_t arg3)
{
/* Perform early platform-specific setup */
bl2_early_platform_setup2(arg0, arg1, arg2, arg3);
#ifdef AARCH64
/*
* Update pointer authentication key before the MMU is enabled. It is
* saved in the rodata section, that can be writen before enabling the
* MMU. This function must be called after the console is initialized
* in the early platform setup.
*/
bl_handle_pauth();
#endif /* AARCH64 */
/* Perform late platform-specific setup */
bl2_plat_arch_setup();
}
/*******************************************************************************
* The only thing to do in BL2 is to load further images and pass control to
* next BL. The memory occupied by BL2 will be reclaimed by BL3x stages. BL2

6
include/bl2/bl2.h
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -7,6 +7,10 @@
#ifndef BL2_H
#define BL2_H
#include <stdint.h>
void bl2_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2,
u_register_t arg3);
void bl2_main(void);
#endif /* BL2_H */