This is a note to let you know that I've just added the patch titled
LoongArch: Add support for 32_PCREL relocation type
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
loongarch-add-support-for-32_pcrel-relocation-type.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c1c2ce2d3bf903c50f3da7346d394127ffcc93ac Mon Sep 17 00:00:00 2001
From: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
Date: Wed, 27 Sep 2023 16:19:13 +0800
Subject: LoongArch: Add support for 32_PCREL relocation type
From: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
commit c1c2ce2d3bf903c50f3da7346d394127ffcc93ac upstream.
When build and update kernel with the latest upstream binutils and
loongson3_defconfig, module loader fails with:
kmod: zsmalloc: Unsupport relocation type 99, please add its support.
kmod: fuse: Unsupport relocation type 99, please add its support.
kmod: ipmi_msghandler: Unsupport relocation type 99, please add its support.
kmod: ipmi_msghandler: Unsupport relocation type 99, please add its support.
kmod: pstore: Unsupport relocation type 99, please add its support.
kmod: drm_display_helper: Unsupport relocation type 99, please add its support.
kmod: drm_display_helper: Unsupport relocation type 99, please add its support.
kmod: drm_display_helper: Unsupport relocation type 99, please add its support.
kmod: fuse: Unsupport relocation type 99, please add its support.
kmod: fat: Unsupport relocation type 99, please add its support.
This is because the latest upstream binutils replaces a pair of ADD32
and SUB32 with 32_PCREL, so add support for 32_PCREL relocation type.
Link: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=ecb802d02eeb
Cc: <stable@xxxxxxxxxxxxxxx>
Co-developed-by: Youling Tang <tangyouling@xxxxxxxxxxx>
Signed-off-by: Youling Tang <tangyouling@xxxxxxxxxxx>
Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/loongarch/kernel/module.c | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/arch/loongarch/kernel/module.c
+++ b/arch/loongarch/kernel/module.c
@@ -367,6 +367,15 @@ static int apply_r_larch_got_pc(struct m
return apply_r_larch_pcala(mod, location, got, rela_stack, rela_stack_top, type);
}
+static int apply_r_larch_32_pcrel(struct module *mod, u32 *location, Elf_Addr v,
+ s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
+{
+ ptrdiff_t offset = (void *)v - (void *)location;
+
+ *(u32 *)location = offset;
+ return 0;
+}
+
/*
* reloc_handlers_rela() - Apply a particular relocation to a module
* @mod: the module to apply the reloc to
@@ -396,6 +405,7 @@ static reloc_rela_handler reloc_rela_han
[R_LARCH_SOP_POP_32_S_10_5 ... R_LARCH_SOP_POP_32_U] = apply_r_larch_sop_imm_field,
[R_LARCH_ADD32 ... R_LARCH_SUB64] = apply_r_larch_add_sub,
[R_LARCH_PCALA_HI20...R_LARCH_PCALA64_HI12] = apply_r_larch_pcala,
+ [R_LARCH_32_PCREL] = apply_r_larch_32_pcrel,
};
int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
Patches currently in stable-queue which might be from yangtiezhu@xxxxxxxxxxx are
queue-6.5/loongarch-add-support-for-64_pcrel-relocation-type.patch
queue-6.5/loongarch-add-support-for-32_pcrel-relocation-type.patch
queue-6.5/loongarch-define-relocation-types-for-abi-v2.10.patch
