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| author | Alexey Sheplyakov <asheplyakov@basealt.ru> | 2024-02-21 13:07:21 +0400 |
|---|---|---|
| committer | Michael Brown <mcb30@ipxe.org> | 2024-02-22 14:40:53 +0000 |
| commit | ee6185dcf5ad7b0d5e486e66c424341764fc221d (patch) | |
| tree | 3353a5c8cc2530db1f2dcd38f49d7705ae0fdaa0 | |
| parent | e5f3ba0ca773e8ea4dcfec6e10f18a06d14e79e0 (diff) | |
| download | ipxe-ee6185dcf5ad7b0d5e486e66c424341764fc221d.zip ipxe-ee6185dcf5ad7b0d5e486e66c424341764fc221d.tar.gz ipxe-ee6185dcf5ad7b0d5e486e66c424341764fc221d.tar.bz2 | |
[efi] Ignore new LoongArch PC-relative relocations and relaxations
Several new relocations types have been added in LoongArch ABI version
2.10. In particular:
- R_LARCH_B16 (18-bit PC-relative jump)
- R_LARCH_B21 (23-bit PC-relative jump)
- R_LARCH_PCREL20_S2 (22-bit PC-relative offset)
Also relocation relaxations have been introduced. Recent GCC (13.2)
and binutils 2.41+ use these types of relocations, which confuses
elf2efi tool. As a result, iPXE EFI images for LoongArch fail to
build with the following error:
Unrecognised relocation type 103
Fix by ignoring R_LARCH_B{16,21} and R_LARCH_PCREL20_S2 (as with other
PC-relative relocations), and by ignoring relaxations (R_LARCH_RELAX).
Relocation relaxations are basically optimizations: ignoring them
results in a correct binary (although it might be suboptimal).
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
| -rw-r--r-- | src/util/elf2efi.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/util/elf2efi.c b/src/util/elf2efi.c index 88713b6..4af587d 100644 --- a/src/util/elf2efi.c +++ b/src/util/elf2efi.c @@ -140,6 +140,12 @@ #ifndef R_LARCH_64 #define R_LARCH_64 2 #endif +#ifndef R_LARCH_B16 +#define R_LARCH_B16 64 +#endif +#ifndef R_LARCH_B21 +#define R_LARCH_B21 65 +#endif #ifndef R_LARCH_B26 #define R_LARCH_B26 66 #endif @@ -155,6 +161,12 @@ #ifndef R_LARCH_GOT_PC_LO12 #define R_LARCH_GOT_PC_LO12 76 #endif +#ifndef R_LARCH_RELAX +#define R_LARCH_RELAX 100 +#endif +#ifndef R_LARCH_PCREL20_S2 +#define R_LARCH_PCREL20_S2 103 +#endif #ifndef R_X86_64_GOTPCRELX #define R_X86_64_GOTPCRELX 41 #endif @@ -849,16 +861,24 @@ static void process_reloc ( struct elf_file *elf, const Elf_Shdr *shdr, case ELF_MREL ( EM_AARCH64, R_AARCH64_LDST32_ABS_LO12_NC ) : case ELF_MREL ( EM_AARCH64, R_AARCH64_LDST64_ABS_LO12_NC ) : case ELF_MREL ( EM_AARCH64, R_AARCH64_LDST128_ABS_LO12_NC ) : + case ELF_MREL ( EM_LOONGARCH, R_LARCH_B16): + case ELF_MREL ( EM_LOONGARCH, R_LARCH_B21): case ELF_MREL ( EM_LOONGARCH, R_LARCH_B26): case ELF_MREL ( EM_LOONGARCH, R_LARCH_PCALA_HI20 ): case ELF_MREL ( EM_LOONGARCH, R_LARCH_PCALA_LO12 ): case ELF_MREL ( EM_LOONGARCH, R_LARCH_GOT_PC_HI20 ): case ELF_MREL ( EM_LOONGARCH, R_LARCH_GOT_PC_LO12 ): + case ELF_MREL ( EM_LOONGARCH, R_LARCH_PCREL20_S2 ): /* Skip PC-relative relocations; all relative * offsets remain unaltered when the object is * loaded. */ break; + case ELF_MREL ( EM_LOONGARCH, R_LARCH_RELAX ): + /* Relocation can be relaxed (optimized out). + * Ignore it for now. + */ + break; case ELF_MREL ( EM_X86_64, R_X86_64_32 ) : /* Ignore 32-bit relocations in a hybrid * 32-bit BIOS and 64-bit UEFI binary, |