objtool: Collect more annotations in objtool.h

Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/r/20241128094311.786598147@infradead.org

diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alternative.h
index 595695f85f80462c18cb5a9158e31951d5c35721..e3903b731305c957b0227430a667c4ce54560178 100644 (file)
--- a/arch/x86/include/asm/alternative.h
+++ b/arch/x86/include/asm/alternative.h
@@ -55,12 +55,6 @@
 #define LOCK_PREFIX ""
 #endif
 
-/*
- * objtool annotation to ignore the alternatives and only consider the original
- * instruction(s).
- */
-#define ANNOTATE_IGNORE_ALTERNATIVE    ASM_ANNOTATE(ANNOTYPE_IGNORE_ALTS)
-
 /*
  * The patching flags are part of the upper bits of the @ft_flags parameter when
  * specifying them. The split is currently like this:
@@ -307,12 +301,6 @@ void nop_func(void);
        .endm
 #endif
 
-/*
- * objtool annotation to ignore the alternatives and only consider the original
- * instruction(s).
- */
-#define ANNOTATE_IGNORE_ALTERNATIVE ANNOTATE type=ANNOTYPE_IGNORE_ALTS
-
 /*
  * Issue one struct alt_instr descriptor entry (need to put it into
  * the section .altinstructions, see below). This entry contains

diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index 50340a125953b5248ba32941cd704103042b364d..7e8bf78c03d5d045889aa1449aa3e9a38f4742d7 100644 (file)
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -179,13 +179,6 @@
 
 #ifdef __ASSEMBLY__
 
-/*
- * This should be used immediately before an indirect jump/call. It tells
- * objtool the subsequent indirect jump/call is vouched safe for retpoline
- * builds.
- */
-#define ANNOTATE_RETPOLINE_SAFE        ANNOTATE type=ANNOTYPE_RETPOLINE_SAFE
-
 /*
  * (ab)use RETPOLINE_SAFE on RET to annotate away 'bare' RET instructions
  * vs RETBleed validation.
@@ -345,8 +338,6 @@
 
 #else /* __ASSEMBLY__ */
 
-#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[];
 extern retpoline_thunk_t __x86_indirect_call_thunk_array[];

diff --git a/include/linux/instrumentation.h b/include/linux/instrumentation.h
index c8f866cf02d8821752c3a23aafd1a003520ba0de..bf675a8aef8ab9b0de310df702d554e3ff86f52b 100644 (file)
--- a/include/linux/instrumentation.h
+++ b/include/linux/instrumentation.h
@@ -10,7 +10,7 @@
 /* Begin/end of an instrumentation safe region */
 #define __instrumentation_begin(c) ({                                  \
        asm volatile(__stringify(c) ": nop\n\t"                         \
-                    __ASM_ANNOTATE(__ASM_BREF(c), ANNOTYPE_INSTR_BEGIN)\
+                    ANNOTATE_INSTR_BEGIN(__ASM_BREF(c))                \
                     : : "i" (c));                                      \
 })
 #define instrumentation_begin() __instrumentation_begin(__COUNTER__)
@@ -48,7 +48,7 @@
  */
 #define __instrumentation_end(c) ({                                    \
        asm volatile(__stringify(c) ": nop\n\t"                         \
-                    __ASM_ANNOTATE(__ASM_BREF(c), ANNOTYPE_INSTR_END)  \
+                    ANNOTATE_INSTR_END(__ASM_BREF(c))                  \
                     : : "i" (c));                                      \
 })
 #define instrumentation_end() __instrumentation_end(__COUNTER__)

diff --git a/include/linux/objtool.h b/include/linux/objtool.h
index 42287c1e32ce0335cd57d5c3b985b20a108f68d9..fd487d466bb2e34dc0594c8335346b3ec8d27d0e 100644 (file)
--- a/include/linux/objtool.h
+++ b/include/linux/objtool.h
@@ -63,8 +63,6 @@
        "911:\n\t"                                              \
        __ASM_ANNOTATE(911b, type)
 
-#define ANNOTATE_NOENDBR       ASM_ANNOTATE(ANNOTYPE_NOENDBR)
-
 #else /* __ASSEMBLY__ */
 
 /*
@@ -113,19 +111,6 @@
 #endif
 .endm
 
-/*
- * Use objtool to validate the entry requirement that all code paths do
- * VALIDATE_UNRET_END before RET.
- *
- * NOTE: The macro must be used at the beginning of a global symbol, otherwise
- * it will be ignored.
- */
-#if defined(CONFIG_NOINSTR_VALIDATION) && \
-       (defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_MITIGATION_SRSO))
-#define VALIDATE_UNRET_BEGIN   ANNOTATE type=ANNOTYPE_UNRET_BEGIN
-#else
-#define VALIDATE_UNRET_BEGIN
-#endif
 
 .macro REACHABLE
 .Lhere_\@:
@@ -142,14 +127,6 @@
        .popsection
 .endm
 
-#define ANNOTATE_NOENDBR       ANNOTATE type=ANNOTYPE_NOENDBR
-
-/*
- * This macro indicates that the following intra-function call is valid.
- * Any non-annotated intra-function call will cause objtool to issue a warning.
- */
-#define ANNOTATE_INTRA_FUNCTION_CALL ANNOTATE type=ANNOTYPE_INTRA_FUNCTION_CALL
-
 #endif /* __ASSEMBLY__ */
 
 #else /* !CONFIG_OBJTOOL */
@@ -161,16 +138,12 @@
 #define STACK_FRAME_NON_STANDARD_FP(func)
 #define __ASM_ANNOTATE(label, type)
 #define ASM_ANNOTATE(type)
-#define ANNOTATE_NOENDBR
 #define ASM_REACHABLE
 #else
-#define ANNOTATE_INTRA_FUNCTION_CALL
 .macro UNWIND_HINT type:req sp_reg=0 sp_offset=0 signal=0
 .endm
 .macro STACK_FRAME_NON_STANDARD func:req
 .endm
-.macro ANNOTATE_NOENDBR
-.endm
 .macro REACHABLE
 .endm
 .macro ANNOTATE type:req
@@ -179,4 +152,57 @@
 
 #endif /* CONFIG_OBJTOOL */
 
+#ifndef __ASSEMBLY__
+/*
+ * Annotate away the various 'relocation to !ENDBR` complaints; knowing that
+ * these relocations will never be used for indirect calls.
+ */
+#define ANNOTATE_NOENDBR               ASM_ANNOTATE(ANNOTYPE_NOENDBR)
+/*
+ * This should be used immediately before an indirect jump/call. It tells
+ * objtool the subsequent indirect jump/call is vouched safe for retpoline
+ * builds.
+ */
+#define ANNOTATE_RETPOLINE_SAFE                ASM_ANNOTATE(ANNOTYPE_RETPOLINE_SAFE)
+/*
+ * See linux/instrumentation.h
+ */
+#define ANNOTATE_INSTR_BEGIN(label)    __ASM_ANNOTATE(label, ANNOTYPE_INSTR_BEGIN)
+#define ANNOTATE_INSTR_END(label)      __ASM_ANNOTATE(label, ANNOTYPE_INSTR_END)
+/*
+ * objtool annotation to ignore the alternatives and only consider the original
+ * instruction(s).
+ */
+#define ANNOTATE_IGNORE_ALTERNATIVE    ASM_ANNOTATE(ANNOTYPE_IGNORE_ALTS)
+/*
+ * This macro indicates that the following intra-function call is valid.
+ * Any non-annotated intra-function call will cause objtool to issue a warning.
+ */
+#define ANNOTATE_INTRA_FUNCTION_CALL   ASM_ANNOTATE(ANNOTYPE_INTRA_FUNCTION_CALL)
+/*
+ * Use objtool to validate the entry requirement that all code paths do
+ * VALIDATE_UNRET_END before RET.
+ *
+ * NOTE: The macro must be used at the beginning of a global symbol, otherwise
+ * it will be ignored.
+ */
+#define ANNOTATE_UNRET_BEGIN           ASM_ANNOTATE(ANNOTYPE_UNRET_BEGIN)
+
+#else
+#define ANNOTATE_NOENDBR               ANNOTATE type=ANNOTYPE_NOENDBR
+#define ANNOTATE_RETPOLINE_SAFE                ANNOTATE type=ANNOTYPE_RETPOLINE_SAFE
+/*     ANNOTATE_INSTR_BEGIN            ANNOTATE type=ANNOTYPE_INSTR_BEGIN */
+/*     ANNOTATE_INSTR_END              ANNOTATE type=ANNOTYPE_INSTR_END */
+#define ANNOTATE_IGNORE_ALTERNATIVE    ANNOTATE type=ANNOTYPE_IGNORE_ALTS
+#define ANNOTATE_INTRA_FUNCTION_CALL   ANNOTATE type=ANNOTYPE_INTRA_FUNCTION_CALL
+#define ANNOTATE_UNRET_BEGIN           ANNOTATE type=ANNOTYPE_UNRET_BEGIN
+#endif
+
+#if defined(CONFIG_NOINSTR_VALIDATION) && \
+       (defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_MITIGATION_SRSO))
+#define VALIDATE_UNRET_BEGIN   ANNOTATE_UNRET_BEGIN
+#else
+#define VALIDATE_UNRET_BEGIN
+#endif
+
 #endif /* _LINUX_OBJTOOL_H */