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lib: Add ASan support to romstage on x86 arch

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This patch adds ASan support to romstage on x86 architecture.
A Kconfig option is added to enable ASan in romstage. Compiler
flags are updated. A memory space representing the shadow region
is reserved in linker section. And a function call to asan_init()
is added to initialize shadow region when romstage loads.

Change-Id: I67ebfb5e8d602e865b1f5c874860861ae4e54381
Signed-off-by: Harshit Sharma <harshitsharmajs@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43604
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
This commit is contained in:
Harshit Sharma
2020-07-20 00:21:05 -07:00
committed by Patrick Georgi
parent 9c88fb8df0
commit a6ebe08333
6 changed files with 66 additions and 10 deletions
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4
src/arch/x86/assembly_entry.S
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@@ -49,6 +49,10 @@ debug_spinloop:
#if CONFIG(IDT_IN_EVERY_STAGE)
call exception_init
#endif
#if CONFIG(ASAN_IN_ROMSTAGE)
call asan_init
#endif
call car_stage_entry
/* Expect to never return. */

6
src/arch/x86/car.ld
View File

@@ -72,8 +72,12 @@
*(.sbss.*)
. = ALIGN(ARCH_POINTER_ALIGN_SIZE);
_ebss = .;
_car_unallocated_start = .;
#if ENV_ROMSTAGE && CONFIG(ASAN_IN_ROMSTAGE)
_shadow_size = (_ebss - _car_region_start) >> 3;
REGION(asan_shadow, ., _shadow_size, ARCH_POINTER_ALIGN_SIZE)
#endif
_car_unallocated_start = .;
_car_region_end = . + CONFIG_DCACHE_RAM_SIZE - (. - _car_region_start);
}
. = _car_region_end;