objtool: Teach get_alt_entry() about more relocation types
Occasionally objtool encounters symbol (as opposed to section) relocations in .altinstructions. Typically they are the alternatives written by elf_add_alternative() as encountered on a noinstr validation run on vmlinux after having already ran objtool on the individual .o files. Basically this is the counterpart of commit 44f6a7c0 ("objtool: Fix seg fault with Clang non-section symbols"), because when these new assemblers (binutils now also does this) strip the section symbols, elf_add_reloc_to_insn() is forced to emit symbol based relocations. As such, teach get_alt_entry() about different relocation types. Fixes: 9bc0bb50 ("objtool/x86: Rewrite retpoline thunk calls") Reported-by:Stephen Rothwell <sfr@canb.auug.org.au> Reported-by:
Borislav Petkov <bp@alien8.de> Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by:
Josh Poimboeuf <jpoimboe@redhat.com> Tested-by:
Nathan Chancellor <nathan@kernel.org> Link: https://lore.kernel.org/r/YVWUvknIEVNkPvnP@hirez.programming.kicks-ass.net
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