From: WANG Rui wangrui@loongson.cn
stable inclusion from stable-v6.6.13 commit 10d9f8ed6dafb0ed8da77670b7b6098c8304ab1b bugzilla: https://gitee.com/openeuler/kernel/issues/I99TJK
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit eea673e9d5ea994c60b550ffb684413d3759b3f4 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: ZhangPeng zhangpeng362@huawei.com --- arch/loongarch/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile index 96747bfec1a1..d423fba7c406 100644 --- a/arch/loongarch/Makefile +++ b/arch/loongarch/Makefile @@ -80,7 +80,7 @@ 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)