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objtool: Re-add UNWIND_HINT_{SAVE_RESTORE}

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  c536ed2fff ("objtool: Remove SAVE/RESTORE hints")

removed the save/restore unwind hints because they were no longer
needed. Now they're going to be needed again so re-add them.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Josh Poimboeuf
2022-06-24 12:52:40 +02:00
committed by Borislav Petkov
parent acac5e98ef
commit 8faea26e61
5 changed files with 68 additions and 15 deletions
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6
tools/include/linux/objtool.h
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@@ -40,6 +40,8 @@ struct unwind_hint {
#define UNWIND_HINT_TYPE_REGS_PARTIAL 2
#define UNWIND_HINT_TYPE_FUNC 3
#define UNWIND_HINT_TYPE_ENTRY 4
#define UNWIND_HINT_TYPE_SAVE 5
#define UNWIND_HINT_TYPE_RESTORE 6
#ifdef CONFIG_OBJTOOL
@@ -127,7 +129,7 @@ struct unwind_hint {
* the debuginfo as necessary. It will also warn if it sees any
* inconsistencies.
*/
.macro UNWIND_HINT sp_reg:req sp_offset=0 type:req end=0
.macro UNWIND_HINT type:req sp_reg=0 sp_offset=0 end=0
.Lunwind_hint_ip_\@:
.pushsection .discard.unwind_hints
/* struct unwind_hint */
@@ -180,7 +182,7 @@ struct unwind_hint {
#define ASM_REACHABLE
#else
#define ANNOTATE_INTRA_FUNCTION_CALL
.macro UNWIND_HINT sp_reg:req sp_offset=0 type:req end=0
.macro UNWIND_HINT type:req sp_reg=0 sp_offset=0 end=0
.endm
.macro STACK_FRAME_NON_STANDARD func:req
.endm