Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> --- arch/x86/include/asm/nospec-branch.h | 13 +------- include/linux/objtool_types.h | 1 tools/include/linux/objtool_types.h | 1 tools/objtool/check.c | 52 ++++++++++++----------------------- 4 files changed, 22 insertions(+), 45 deletions(-) --- a/arch/x86/include/asm/nospec-branch.h +++ b/arch/x86/include/asm/nospec-branch.h @@ -193,12 +193,7 @@ * objtool the subsequent indirect jump/call is vouched safe for retpoline * builds. */ -.macro ANNOTATE_RETPOLINE_SAFE -.Lhere_\@: - .pushsection .discard.retpoline_safe - .long .Lhere_\@ - .popsection -.endm +#define ANNOTATE_RETPOLINE_SAFE ANNOTATE type=ANNOTYPE_RETPOLINE_SAFE /* * (ab)use RETPOLINE_SAFE on RET to annotate away 'bare' RET instructions @@ -317,11 +312,7 @@ #else /* __ASSEMBLY__ */ -#define ANNOTATE_RETPOLINE_SAFE \ - "999:\n\t" \ - ".pushsection .discard.retpoline_safe\n\t" \ - ".long 999b\n\t" \ - ".popsection\n\t" +#define ANNOTATE_RETPOLINE_SAFE ASM_ANNOTATE(ANNOTYPE_RETPOLINE_SAFE) typedef u8 retpoline_thunk_t[RETPOLINE_THUNK_SIZE]; extern retpoline_thunk_t __x86_indirect_thunk_array[]; --- a/include/linux/objtool_types.h +++ b/include/linux/objtool_types.h @@ -58,5 +58,6 @@ struct unwind_hint { * Annotate types */ #define ANNOTYPE_NOENDBR 1 +#define ANNOTYPE_RETPOLINE_SAFE 2 #endif /* _LINUX_OBJTOOL_TYPES_H */ --- a/tools/include/linux/objtool_types.h +++ b/tools/include/linux/objtool_types.h @@ -58,5 +58,6 @@ struct unwind_hint { * Annotate types */ #define ANNOTYPE_NOENDBR 1 +#define ANNOTYPE_RETPOLINE_SAFE 2 #endif /* _LINUX_OBJTOOL_TYPES_H */ --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -2308,12 +2308,12 @@ static int read_unwind_hints(struct objt return 0; } -static int read_annotate(struct objtool_file *file, void (*func)(int type, struct instruction *insn)) +static int read_annotate(struct objtool_file *file, int (*func)(int type, struct instruction *insn)) { struct section *rsec, *sec; struct instruction *insn; struct reloc *reloc; - int type; + int type, ret; rsec = find_section_by_name(file->elf, ".rela.discard.annotate"); if (!rsec) @@ -2333,53 +2333,37 @@ static int read_annotate(struct objtool_ type = *(u32 *)(sec->data->d_buf + (reloc_idx(reloc) * sec->sh.sh_entsize) + 4); - func(type, insn); + ret = func(type, insn); + if (ret < 0) + return ret; } return 0; } -static void __annotate_noendbr(int type, struct instruction *insn) +static int __annotate_noendbr(int type, struct instruction *insn) { if (type != ANNOTYPE_NOENDBR) - return; + return 0; insn->noendbr = 1; + return 0; } -static int read_retpoline_hints(struct objtool_file *file) +static int __annotate_retpoline_safe(int type, struct instruction *insn) { - struct section *rsec; - struct instruction *insn; - struct reloc *reloc; - - rsec = find_section_by_name(file->elf, ".rela.discard.retpoline_safe"); - if (!rsec) + if (type != ANNOTYPE_RETPOLINE_SAFE) return 0; - for_each_reloc(rsec, reloc) { - if (reloc->sym->type != STT_SECTION) { - WARN("unexpected relocation symbol type in %s", rsec->name); - return -1; - } - - insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc)); - if (!insn) { - WARN("bad .discard.retpoline_safe entry"); - return -1; - } - - if (insn->type != INSN_JUMP_DYNAMIC && - insn->type != INSN_CALL_DYNAMIC && - insn->type != INSN_RETURN && - insn->type != INSN_NOP) { - WARN_INSN(insn, "retpoline_safe hint not an indirect jump/call/ret/nop"); - return -1; - } - - insn->retpoline_safe = true; + if (insn->type != INSN_JUMP_DYNAMIC && + insn->type != INSN_CALL_DYNAMIC && + insn->type != INSN_RETURN && + insn->type != INSN_NOP) { + WARN_INSN(insn, "retpoline_safe hint not an indirect jump/call/ret/nop"); + return -1; } + insn->retpoline_safe = true; return 0; } @@ -2666,7 +2650,7 @@ static int decode_sections(struct objtoo if (ret) return ret; - ret = read_retpoline_hints(file); + ret = read_annotate(file, __annotate_retpoline_safe); if (ret) return ret;