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Merge "ANDROID: kbuild: ensure __cfi_check is correctly aligned"

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qctecmdr 2020-06-22 20:50:37 -07:00 • committed by Gerrit - the friendly Code Review server
commit a9e028c82c
3 changed files with 16 additions and 2 deletions
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2
Makefile
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@ -890,7 +890,7 @@ LD_FLAGS_LTO_CLANG := -mllvm -import-instr-limit=5
KBUILD_LDFLAGS += $(LD_FLAGS_LTO_CLANG)
KBUILD_LDFLAGS_MODULE += $(LD_FLAGS_LTO_CLANG)
KBUILD_LDS_MODULE += $(srctree)/scripts/module-lto.lds
KBUILD_LDS_MODULE += scripts/module-lto.lds
endif
ifdef CONFIG_LTO

2
scripts/Makefile
View file

@ -31,6 +31,8 @@ always := $(hostprogs-y) $(hostprogs-m)
# The following hostprogs-y programs are only build on demand
hostprogs-y += unifdef
extra-$(CONFIG_LTO_CLANG) += module-lto.lds
subdir-$(CONFIG_GCC_PLUGINS) += gcc-plugins
subdir-$(CONFIG_MODVERSIONS) += genksyms
subdir-$(CONFIG_SECURITY_SELINUX) += selinux

14
scripts/module-lto.lds → scripts/module-lto.lds.S
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@ -1,3 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0 */
#include <asm/page.h>
/*
* With CONFIG_LTO_CLANG, LLD always enables -fdata-sections and
* -ffunction-sections, which increases the size of the final module.
@ -18,5 +21,14 @@ SECTIONS {
.rela.rodata : { *(.rela.rodata .rela.rodata.[0-9a-zA-Z_]*) }
.rela.text : { *(.rela.text .rela.text.[0-9a-zA-Z_]*) }
.rodata : { *(.rodata .rodata.[0-9a-zA-Z_]*) }
.text : { *(.text .text.[0-9a-zA-Z_]*) }
/*
* With CFI_CLANG, ensure __cfi_check is at the beginning of the
* .text section, and that the section is aligned to page size.
*/
.text : ALIGN(PAGE_SIZE) {
*(.text.__cfi_check)
*(.text .text.[0-9a-zA-Z_]* .text..L.cfi*)
}
}