mips: Add support for PC32 relocations in vmlinux

MIPS supports PC32 relocations like most other architectures, which will
be used by kallsyms to make its symbol references visible to the linker.

Given that these are place-relative, they can be ignored by the 'relocs'
tool, just like other PC type relocations.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://patch.msgid.link/20260116093359.2442297-5-ardb+git@google.com
Signed-off-by: Nathan Chancellor <nathan@kernel.org>

diff --git a/arch/mips/boot/tools/relocs.c b/arch/mips/boot/tools/relocs.c
index 9863e1d5c62e3dea3a42dbea150debc401fb2d9c..30809f47415a40b98cc589bae1472c5c82bb7951 100644 (file)
--- a/arch/mips/boot/tools/relocs.c
+++ b/arch/mips/boot/tools/relocs.c
@@ -79,6 +79,7 @@ static const char *rel_type(unsigned type)
                REL_TYPE(R_MIPS_HIGHEST),
                REL_TYPE(R_MIPS_PC21_S2),
                REL_TYPE(R_MIPS_PC26_S2),
+               REL_TYPE(R_MIPS_PC32),
 #undef REL_TYPE
        };
        const char *name = "unknown type rel type name";
@@ -522,6 +523,7 @@ static int do_reloc(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
        case R_MIPS_PC16:
        case R_MIPS_PC21_S2:
        case R_MIPS_PC26_S2:
+       case R_MIPS_PC32:
                /*
                 * NONE can be ignored and PC relative relocations don't
                 * need to be adjusted.

diff --git a/arch/mips/include/asm/elf.h b/arch/mips/include/asm/elf.h
index dc8d2863752cfd5e8e2cbd750276f9463e0c32b8..aaef0eaa68d5521f39662c60fe6dd5c084cb04be 100644 (file)
--- a/arch/mips/include/asm/elf.h
+++ b/arch/mips/include/asm/elf.h
@@ -123,6 +123,8 @@
 #define R_MIPS_LOVENDOR                100
 #define R_MIPS_HIVENDOR                127
 
+#define R_MIPS_PC32            248
+
 #define SHN_MIPS_ACCOMON       0xff00          /* Allocated common symbols */
 #define SHN_MIPS_TEXT          0xff01          /* Allocated test symbols.  */
 #define SHN_MIPS_DATA          0xff02          /* Allocated data symbols.  */