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BL31: 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 |  +192 | +1536 |   +0  |   +0   |
|                            |  0.3% |  3.1% |       |        |
+----------------------------+-------+-------+-------+--------+
| ENABLE_PAUTH = 1           | +1848 | +1536 |  +16  |   +0   |
|                            |  3.3% |  3.1% |  3.1% |        |
+----------------------------+-------+-------+-------+--------+

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

Change-Id: I43db7e509a4f39da6599ec2faa690d197573ec1b
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
This commit is contained in:
Antonio Nino Diaz 2019-01-31 11:01:26 +00:00
parent dcbfa11bd9
commit 88cfd9a604
4 changed files with 48 additions and 11 deletions
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30
bl31/aarch64/bl31_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
*/
@ -87,29 +87,39 @@ func bl31_entrypoint
bl fixup_gdt_reloc
#endif /* ENABLE_PIE */
/* ---------------------------------------------
* Perform platform specific early arch. setup
* ---------------------------------------------
/* --------------------------------------------------------------------
* Perform BL31 setup
* --------------------------------------------------------------------
*/
mov x0, x20
mov x1, x21
mov x2, x22
mov x3, x23
bl bl31_early_platform_setup2
bl bl31_plat_arch_setup
bl bl31_setup
/* ---------------------------------------------
/* --------------------------------------------------------------------
* Enable pointer authentication
* --------------------------------------------------------------------
*/
#if ENABLE_PAUTH
mrs x0, sctlr_el3
orr x0, x0, #SCTLR_EnIA_BIT
msr sctlr_el3, x0
isb
#endif /* ENABLE_PAUTH */
/* --------------------------------------------------------------------
* Jump to main function.
* ---------------------------------------------
* --------------------------------------------------------------------
*/
bl bl31_main
/* -------------------------------------------------------------
/* --------------------------------------------------------------------
* Clean the .data & .bss sections to main memory. This ensures
* that any global data which was initialised by the primary CPU
* is visible to secondary CPUs before they enable their data
* caches and participate in coherency.
* -------------------------------------------------------------
* --------------------------------------------------------------------
*/
adr x0, __DATA_START__
adr x1, __DATA_END__

4
bl31/bl31.mk
View file

@ -75,6 +75,10 @@ ifeq (${ENABLE_MPAM_FOR_LOWER_ELS},1)
BL31_SOURCES += lib/extensions/mpam/mpam.c
endif
ifeq (${ENABLE_PAUTH},1)
BL31_CFLAGS += -msign-return-address=non-leaf
endif
ifeq (${WORKAROUND_CVE_2017_5715},1)
BL31_SOURCES += lib/cpus/aarch64/wa_cve_2017_5715_bpiall.S \
lib/cpus/aarch64/wa_cve_2017_5715_mmu.S

21
bl31/bl31_main.c
View file

@ -63,6 +63,27 @@ void __init bl31_lib_init(void)
cm_init();
}
/*******************************************************************************
* Setup function for BL31.
******************************************************************************/
void bl31_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2,
u_register_t arg3)
{
/* Perform early platform-specific setup */
bl31_early_platform_setup2(arg0, arg1, arg2, arg3);
/*
* 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();
/* Perform late platform-specific setup */
bl31_plat_arch_setup();
}
/*******************************************************************************
* BL31 is responsible for setting up the runtime services for the primary cpu
* before passing control to the bootloader or an Operating System. This

4
include/bl31/bl31.h
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
*/
@ -12,6 +12,8 @@
/*******************************************************************************
* Function prototypes
******************************************************************************/
void bl31_setup(u_register_t arg0, u_register_t arg1, u_register_t arg2,
u_register_t arg3);
void bl31_next_el_arch_setup(uint32_t security_state);
void bl31_set_next_image_type(uint32_t security_state);
uint32_t bl31_get_next_image_type(void);