[PATCH] objtool: Fix STACK_FRAME_NON_STANDARD reloc type

From: Peter Zijlstra
Date: Fri Apr 29 2022 - 05:20:42 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 | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

--- a/include/linux/objtool.h
+++ b/include/linux/objtool.h
@@ -137,7 +137,11 @@ struct unwind_hint {

.macro STACK_FRAME_NON_STANDARD func:req
.pushsection .discard.func_stack_frame_non_standard, "aw"
- .long \func - .
+#ifdef CONFIG_64BIT
+ .quad \func
+#else
+ .long \func
+#endif
.popsection
.endm