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authorWANG Xuerui <git@xen0n.name>2024-01-17 12:42:59 +0800
committerHuacai Chen <chenhuacai@loongson.cn>2024-01-17 12:42:59 +0800
commit2772ae4d66d17c6a8b4c167ddb660fc8d7972da5 (patch)
tree0fc145c97b716eb12a12e859041717570a1e4475 /scripts/mod
parent0dd3ee31125508cd67f7e7172247f05b7fd1753a (diff)
modpost: Ignore relaxation and alignment marker relocs on LoongArch
With recent trunk versions of binutils and gcc, alignment directives are represented with R_LARCH_ALIGN relocs on LoongArch, which is necessary for the linker to maintain alignment requirements during its relaxation passes. And even though the kernel is built with relaxation disabled, so far a small number of R_LARCH_RELAX marker relocs are still emitted as part of la.* pseudo instructions in assembly. These two kinds of relocs do not refer to symbols, which can trip up modpost's section mismatch checks, because the r_offset of said relocs can be zero or any other meaningless value, eventually leading to a `from == NULL` condition in default_mismatch_handler and SIGSEGV. As the two kinds of relocs are not concerned with symbols, just ignore them for section mismatch check purposes. Signed-off-by: WANG Xuerui <git@xen0n.name> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'scripts/mod')
-rw-r--r--scripts/mod/modpost.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index cb6406f485a9..68ab45273a22 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1346,6 +1346,14 @@ static Elf_Addr addend_mips_rel(uint32_t *location, unsigned int r_type)
#define R_LARCH_SUB32 55
#endif
+#ifndef R_LARCH_RELAX
+#define R_LARCH_RELAX 100
+#endif
+
+#ifndef R_LARCH_ALIGN
+#define R_LARCH_ALIGN 102
+#endif
+
static void get_rel_type_and_sym(struct elf_info *elf, uint64_t r_info,
unsigned int *r_type, unsigned int *r_sym)
{
@@ -1400,9 +1408,16 @@ static void section_rela(struct module *mod, struct elf_info *elf,
continue;
break;
case EM_LOONGARCH:
- if (!strcmp("__ex_table", fromsec) &&
- r_type == R_LARCH_SUB32)
+ switch (r_type) {
+ case R_LARCH_SUB32:
+ if (!strcmp("__ex_table", fromsec))
+ continue;
+ break;
+ case R_LARCH_RELAX:
+ case R_LARCH_ALIGN:
+ /* These relocs do not refer to symbols */
continue;
+ }
break;
}