diff options
Diffstat (limited to 'tools/objtool/check.c')
| -rw-r--r-- | tools/objtool/check.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/tools/objtool/check.c b/tools/objtool/check.c index d14f20ef1db1..fb47327075fb 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -4644,6 +4644,47 @@ static void disas_warned_funcs(struct objtool_file *file) disas_funcs(funcs); } +__weak bool arch_absolute_reloc(struct elf *elf, struct reloc *reloc) +{ + unsigned int type = reloc_type(reloc); + size_t sz = elf_addr_size(elf); + + return (sz == 8) ? (type == R_ABS64) : (type == R_ABS32); +} + +static int check_abs_references(struct objtool_file *file) +{ + struct section *sec; + struct reloc *reloc; + int ret = 0; + + for_each_sec(file, sec) { + /* absolute references in non-loadable sections are fine */ + if (!(sec->sh.sh_flags & SHF_ALLOC)) + continue; + + /* section must have an associated .rela section */ + if (!sec->rsec) + continue; + + /* + * Special case for compiler generated metadata that is not + * consumed until after boot. + */ + if (!strcmp(sec->name, "__patchable_function_entries")) + continue; + + for_each_reloc(sec->rsec, reloc) { + if (arch_absolute_reloc(file->elf, reloc)) { + WARN("section %s has absolute relocation at offset 0x%lx", + sec->name, reloc_offset(reloc)); + ret++; + } + } + } + return ret; +} + struct insn_chunk { void *addr; struct insn_chunk *next; @@ -4777,6 +4818,9 @@ int check(struct objtool_file *file) goto out; } + if (opts.noabs) + warnings += check_abs_references(file); + if (opts.orc && nr_insns) { ret = orc_create(file); if (ret) |