[PATCH 1/7] x86/entry: Anchor annotation
From: Peter Zijlstra
Date: Thu May 26 2022 - 07:03:44 EST
x86_64-allmodconfig gives:
vmlinux.o: warning: objtool: entry_SYSCALL_compat+0x0: ANNOTATE_NOENDBR on ENDBR
This is due to:
ANNOTATE_NOENDBR
SYM_CODE_END(entry_SYSENTER_compat)
SYM_CODE_START(entry_SYSCALL_compat)
UNWIND_HINT_EMPTY
ENDBR
And the hint then landing on the first instruction of the next symbol,
which happens to be ENDBR. Stick in an int3 to anchor the annotation
in the previous symbol.
Fixes: 3e3f06950434 ("x86/ibt: Annotate text references")
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
arch/x86/entry/entry_64_compat.S | 1 +
1 file changed, 1 insertion(+)
--- a/arch/x86/entry/entry_64_compat.S
+++ b/arch/x86/entry/entry_64_compat.S
@@ -124,6 +124,7 @@ SYM_INNER_LABEL(entry_SYSENTER_compat_af
jmp .Lsysenter_flags_fixed
SYM_INNER_LABEL(__end_entry_SYSENTER_compat, SYM_L_GLOBAL)
ANNOTATE_NOENDBR // is_sysenter_singlestep
+ int3
SYM_CODE_END(entry_SYSENTER_compat)
/*