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authorWANG Rui <wangrui@loongson.cn>2023-12-09 10:49:15 +0300
committerHuacai Chen <chenhuacai@loongson.cn>2023-12-09 10:49:15 +0300
commiteea673e9d5ea994c60b550ffb684413d3759b3f4 (patch)
tree5357404180f646a323ef55c006b0fc3539aeeae3
parent33cc938e65a98f1d29d0a18403dbbee050dcad9a (diff)
downloadlinux-eea673e9d5ea994c60b550ffb684413d3759b3f4.tar.xz
LoongArch: Apply dynamic relocations for LLD
For the following assembly code: .text .global func func: nop .data var: .dword func When linked with `-pie`, GNU LD populates the `var` variable with the pre-relocated value of `func`. However, LLVM LLD does not exhibit the same behavior. This issue also arises with the `kernel_entry` in arch/ loongarch/kernel/head.S: _head: .word MZ_MAGIC /* "MZ", MS-DOS header */ .org 0x8 .dword kernel_entry /* Kernel entry point */ The correct kernel entry from the MS-DOS header is crucial for jumping to vmlinux from zboot. This necessity is why the compressed relocatable kernel compiled by Clang encounters difficulties in booting. To address this problem, it is proposed to apply dynamic relocations to place with `--apply-dynamic-relocs`. Link: https://github.com/ClangBuiltLinux/linux/issues/1962 Signed-off-by: WANG Rui <wangrui@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
-rw-r--r--arch/loongarch/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile
index 204b94b2e6aa..4ba8d67ddb09 100644
--- a/arch/loongarch/Makefile
+++ b/arch/loongarch/Makefile
@@ -83,7 +83,7 @@ endif
ifeq ($(CONFIG_RELOCATABLE),y)
KBUILD_CFLAGS_KERNEL += -fPIE
-LDFLAGS_vmlinux += -static -pie --no-dynamic-linker -z notext
+LDFLAGS_vmlinux += -static -pie --no-dynamic-linker -z notext $(call ld-option, --apply-dynamic-relocs)
endif
cflags-y += $(call cc-option, -mno-check-zero-division)