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FVP: Enable PIE for RESET_TO_BL31=1

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This patch enabled PIE for FVP when RESET_TO_BL31=1. The references
to BL31_BASE are replaced by BL31_START as being a symbol exported by
the linker, will create a dynamic relocation entry in .rela.dyn and
hence will be fixed up by dynamic linker at runtime. Also, we disable
RECLAIM_INIT_CODE when PIE is enabled as the init section overlay
creates some static relocations which cannot be handled by the
dynamic linker currently.

Change-Id: I86df1b0a8b2a8bbbe7c3f3c0b9a08c86c2963ec0
Signed-off-by: Soby Mathew <soby.mathew@arm.com>
This commit is contained in:
Soby Mathew 2018-10-14 08:13:44 +01:00
parent bd83b39621
commit fc922ca87c
3 changed files with 11 additions and 2 deletions
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2
plat/arm/board/fvp/platform.mk
View file

@ -202,7 +202,9 @@ ENABLE_AMU := 1
DYNAMIC_WORKAROUND_CVE_2018_3639 := 1
# Enable reclaiming of BL31 initialisation code for secondary cores stacks for FVP
ifneq (${RESET_TO_BL31},1)
RECLAIM_INIT_CODE := 1
endif
ifeq (${ENABLE_AMU},1)
BL31_SOURCES += lib/cpus/aarch64/cortex_a75_pubsub.c \

6
plat/arm/common/arm_bl31_setup.c
View file

@ -25,11 +25,13 @@
static entry_point_info_t bl32_image_ep_info;
static entry_point_info_t bl33_image_ep_info;
#if !RESET_TO_BL31
/*
* Check that BL31_BASE is above ARM_TB_FW_CONFIG_LIMIT. The reserved page
* is required for SOC_FW_CONFIG/TOS_FW_CONFIG passed from BL2.
*/
CASSERT(BL31_BASE >= ARM_TB_FW_CONFIG_LIMIT, assert_bl31_base_overflows);
#endif
/* Weak definitions may be overridden in specific ARM standard platform */
#pragma weak bl31_early_platform_setup2
@ -38,8 +40,8 @@ CASSERT(BL31_BASE >= ARM_TB_FW_CONFIG_LIMIT, assert_bl31_base_overflows);
#pragma weak bl31_plat_get_next_image_ep_info
#define MAP_BL31_TOTAL MAP_REGION_FLAT( \
BL31_BASE, \
BL31_END - BL31_BASE, \
BL31_START, \
BL31_END - BL31_START, \
MT_MEMORY | MT_RW | MT_SECURE)
#if RECLAIM_INIT_CODE
IMPORT_SYM(unsigned long, __INIT_CODE_START__, BL_INIT_CODE_BASE);

5
plat/arm/common/arm_common.mk
View file

@ -130,6 +130,11 @@ ARM_CRYPTOCELL_INTEG := 0
$(eval $(call assert_boolean,ARM_CRYPTOCELL_INTEG))
$(eval $(call add_define,ARM_CRYPTOCELL_INTEG))
# Enable PIE support for RESET_TO_BL31 case
ifeq (${RESET_TO_BL31},1)
ENABLE_PIE := 1
endif
# CryptoCell integration relies on coherent buffers for passing data from
# the AP CPU to the CryptoCell
ifeq (${ARM_CRYPTOCELL_INTEG},1)