[PATCH 6/6] objtool: Fix STACK_FRAME_NON_STANDARD reloc type

From: Peter Zijlstra
Date: Fri May 06 2022 - 08:20:50 EST


STACK_FRAME_NON_STANDARD results in inconsistent relocation types
depending on .c or .S usage:

Relocation section '.rela.discard.func_stack_frame_non_standard' at offset 0x3c01090 contains 5 entries:
Offset Info Type Symbol's Value Symbol's Name + Addend
0000000000000000 00020c2200000002 R_X86_64_PC32 0000000000047b40 do_suspend_lowlevel + 0
0000000000000008 0002461e00000001 R_X86_64_64 00000000000480a0 machine_real_restart + 0
0000000000000010 0000001400000001 R_X86_64_64 0000000000000000 .rodata + b3d4
0000000000000018 0002444600000002 R_X86_64_PC32 00000000000678a0 __efi64_thunk + 0
0000000000000020 0002659d00000001 R_X86_64_64 0000000000113160 __crash_kexec + 0

Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
include/linux/objtool.h | 4 +++-
tools/include/linux/objtool.h | 4 +++-
2 files changed, 6 insertions(+), 2 deletions(-)

--- a/include/linux/objtool.h
+++ b/include/linux/objtool.h
@@ -2,6 +2,8 @@
#ifndef _LINUX_OBJTOOL_H
#define _LINUX_OBJTOOL_H

+#include <asm/asm.h>
+
#ifndef __ASSEMBLY__

#include <linux/types.h>
@@ -137,7 +139,7 @@ struct unwind_hint {

.macro STACK_FRAME_NON_STANDARD func:req
.pushsection .discard.func_stack_frame_non_standard, "aw"
- .long \func - .
+ _ASM_PTR \func
.popsection
.endm

--- a/tools/include/linux/objtool.h
+++ b/tools/include/linux/objtool.h
@@ -2,6 +2,8 @@
#ifndef _LINUX_OBJTOOL_H
#define _LINUX_OBJTOOL_H

+#include <asm/asm.h>
+
#ifndef __ASSEMBLY__

#include <linux/types.h>
@@ -137,7 +139,7 @@ struct unwind_hint {

.macro STACK_FRAME_NON_STANDARD func:req
.pushsection .discard.func_stack_frame_non_standard, "aw"
- .long \func - .
+ _ASM_PTR \func
.popsection
.endm