kldxref: add LoongArch support

[zhaoxiaoqiang007_gmail.com]

Summary

Add the LoongArch ELF relocator.

Signed-off-by: Xiaoqiang Zhao <[e-mail]>

[jkoshy]

lib/libkldelf/ef_loongarch.c

5

Do you want to add your (c) line here?

[zhaoxiaoqiang007_gmail.com]

update copyright header

[zhaoxiaoqiang007_gmail.com]

lib/libkldelf/ef_loongarch.c

5

updated

[shipujin.t_gmail.com]

lib/libkldelf/ef_loongarch.c

53

commitID(2bb6149): the sys/sys/elf_common.h header has already added the definitions, and D59890 sys/loongarch/loongarch/elf_machdep.c has already implemented data relocations in the kernel.

Here only R_LARCH_64 and R_LARCH_RELATIVE are handled, but the LoongArch ABI defines 100+ relocation types. For 64-bit LoongArch kernel modules, supporting only 2 types will cause a large number of data pointers to fail to resolve.

You could first add the common data relocations, and at the same time change the default branch from returning 0 to returning EINVAL, so that unhandled relocations are not silently ignored.

case R_LARCH_NONE:
	break;
case R_LARCH_64_PCREL:
	addr = EF_SYMADDR(ef, symidx) + addend - (GElf_Addr)where;
	le64enc(where, addr);
	break;
case R_LARCH_JUMP_SLOT:
	addr = EF_SYMADDR(ef, symidx);
	le64enc(where, addr);
	break;
case R_LARCH_IRELATIVE:
	addr = relbase + addend;
	addr = ((GElf_Addr (*)(void))addr)();
	le64enc(where, addr);
	break;

[zhaoxiaoqiang007_gmail.com]

lib/libkldelf/ef_loongarch.c

53

reasonable