objtool: Add asm version of STACK_FRAME_NON_STANDARD

To be used for adding asm functions to the ignore list.  The "aw" is
needed to help the ELF section metadata match GCC-created sections.
Otherwise the linker creates duplicate sections instead of combining
them.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/8faa476f9a5ac89af27944ec184c89f95f3c6c49.1611263462.git.jpoimboe@redhat.com

diff --git a/include/linux/objtool.h b/include/linux/objtool.h
index 577f514..add1c6e 100644 (file)
--- a/include/linux/objtool.h
+++ b/include/linux/objtool.h
@@ -109,6 +109,12 @@ struct unwind_hint {
        .popsection
 .endm
 
+.macro STACK_FRAME_NON_STANDARD func:req
+       .pushsection .discard.func_stack_frame_non_standard, "aw"
+               .long \func - .
+       .popsection
+.endm
+
 #endif /* __ASSEMBLY__ */
 
 #else /* !CONFIG_STACK_VALIDATION */
@@ -122,6 +128,8 @@ struct unwind_hint {
 #define ANNOTATE_INTRA_FUNCTION_CALL
 .macro UNWIND_HINT sp_reg:req sp_offset=0 type:req end=0
 .endm
+.macro STACK_FRAME_NON_STANDARD func:req
+.endm
 #endif
 
 #endif /* CONFIG_STACK_VALIDATION */

diff --git a/tools/include/linux/objtool.h b/tools/include/linux/objtool.h
index 577f514..add1c6e 100644 (file)
--- a/tools/include/linux/objtool.h
+++ b/tools/include/linux/objtool.h
@@ -109,6 +109,12 @@ struct unwind_hint {
        .popsection
 .endm
 
+.macro STACK_FRAME_NON_STANDARD func:req
+       .pushsection .discard.func_stack_frame_non_standard, "aw"
+               .long \func - .
+       .popsection
+.endm
+
 #endif /* __ASSEMBLY__ */
 
 #else /* !CONFIG_STACK_VALIDATION */
@@ -122,6 +128,8 @@ struct unwind_hint {
 #define ANNOTATE_INTRA_FUNCTION_CALL
 .macro UNWIND_HINT sp_reg:req sp_offset=0 type:req end=0
 .endm
+.macro STACK_FRAME_NON_STANDARD func:req
+.endm
 #endif
 
 #endif /* CONFIG_STACK_VALIDATION */