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Treat R_X86_64_PLT32 relocs as R_X86_64_PC32.

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If we load a binary that is designed to be a library, it produces
relocatable code via assembler directives in the assembly itself
(rather than compiler options).  This emits R_X86_64_PLT32 relocations,
which are not handled by the kernel linker.

Submitted by:	gallatin
Reviewed by:	kib
This commit is contained in:
glebius 2016-12-09 18:07:28 +00:00
parent 6c5967127b
commit f8eae77f98
1 changed files with 3 additions and 0 deletions
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3
sys/amd64/amd64/elf_machdep.c
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@ -178,6 +178,7 @@ elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
switch (rtype) {
case R_X86_64_PC32:
case R_X86_64_32S:
case R_X86_64_PLT32:
addend = *(Elf32_Addr *)where;
break;
default:
@ -211,6 +212,8 @@ elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
break;
case R_X86_64_PC32: /* S + A - P */
case R_X86_64_PLT32: /* L + A - P, L is PLT location for
the symbol, which we treat as S */
error = lookup(lf, symidx, 1, &addr);
where32 = (Elf32_Addr *)where;
val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);