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Merge "corstone700: adding support for stack protector for the FVP" into integration

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Alexei Fedorov 2020-02-13 15:29:49 +00:00 committed by TrustedFirmware Code Review
commit 25d583a858
2 changed files with 42 additions and 1 deletions
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35
plat/arm/board/corstone700/corstone700_stack_protector.c Normal file
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@ -0,0 +1,35 @@
/*
* Copyright (c) 2020, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stdint.h>
#include <arch_helpers.h>
#include <plat/common/platform.h>
static uint32_t plat_generate_random_number(void)
{
uintptr_t return_addr = (uintptr_t)__builtin_return_address(0U);
uintptr_t frame_addr = (uintptr_t)__builtin_frame_address(0U);
uint64_t cntpct = read_cntpct_el0();
/* Generate 32-bit pattern: saving the 2 least significant bytes
* in random_lo and random_hi
*/
uint16_t random_lo = (uint16_t)(
(((uint64_t)return_addr) << 13) ^ frame_addr ^ cntpct
);
uint16_t random_hi = (uint16_t)(
(((uint64_t)frame_addr) << 15) ^ return_addr ^ cntpct
);
return (((uint32_t)random_hi) << 16) | random_lo;
}
u_register_t plat_get_stack_protector_canary(void)
{
return plat_generate_random_number(); /* a 32-bit pattern is returned */
}

8
plat/arm/board/corstone700/sp_min/sp_min-corstone700.mk
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@ -1,5 +1,5 @@
#
# Copyright (c) 2019, Arm Limited and Contributors. All rights reserved.
# Copyright (c) 2019-2020, Arm Limited and Contributors. All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
#
@ -15,4 +15,10 @@ BL32_SOURCES += drivers/cfi/v2m/v2m_flash.c \
plat/arm/board/corstone700/sp_min/corstone700_sp_min_setup.c \
${CORSTONE700_GIC_SOURCES}
ifneq (${ENABLE_STACK_PROTECTOR},0)
ifneq (${ENABLE_STACK_PROTECTOR},none)
BL32_SOURCES += plat/arm/board/corstone700/corstone700_stack_protector.c
endif
endif
include plat/arm/common/sp_min/arm_sp_min.mk