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Code Issues Releases Wiki Activity

x86,objtool: Move the ASM_REACHABLE annotation to objtool.h

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Because we need a variant for .S files too.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/Yi9gOW9f1GGwwUD6@hirez.programming.kicks-ass.net
This commit is contained in:
Peter Zijlstra 2022-03-14 18:05:52 +01:00
parent be0075951f
commit dca5da2abe
5 changed files with 34 additions and 7 deletions
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1
arch/x86/include/asm/bug.h
View file

@ -4,6 +4,7 @@
#include <linux/stringify.h>
#include <linux/instrumentation.h>
#include <linux/objtool.h>
/*
* Despite that some emulators terminate on UD2, we use it for WARN().

1
arch/x86/include/asm/irq_stack.h
View file

@ -3,6 +3,7 @@
#define _ASM_X86_IRQ_STACK_H
#include <linux/ptrace.h>
#include <linux/objtool.h>
#include <asm/processor.h>

7
include/linux/compiler.h
View file

@ -125,18 +125,11 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
})
#define annotate_unreachable() __annotate_unreachable(__COUNTER__)
#define ASM_REACHABLE \
"998:\n\t" \
".pushsection .discard.reachable\n\t" \
".long 998b - .\n\t" \
".popsection\n\t"
/* Annotate a C jump table to allow objtool to follow the code flow */
#define __annotate_jump_table __section(".rodata..c_jump_table")
#else
#define annotate_unreachable()
# define ASM_REACHABLE
#define __annotate_jump_table
#endif

16
include/linux/objtool.h
View file

@ -83,6 +83,12 @@ struct unwind_hint {
_ASM_PTR " 986b\n\t" \
".popsection\n\t"
#define ASM_REACHABLE \
"998:\n\t" \
".pushsection .discard.reachable\n\t" \
".long 998b - .\n\t" \
".popsection\n\t"
#else /* __ASSEMBLY__ */
/*
@ -142,6 +148,13 @@ struct unwind_hint {
.popsection
.endm
.macro REACHABLE
.Lhere_\@:
.pushsection .discard.reachable
.long .Lhere_\@ - .
.popsection
.endm
#endif /* __ASSEMBLY__ */
#else /* !CONFIG_STACK_VALIDATION */
@ -153,6 +166,7 @@ struct unwind_hint {
#define STACK_FRAME_NON_STANDARD(func)
#define STACK_FRAME_NON_STANDARD_FP(func)
#define ANNOTATE_NOENDBR
#define ASM_REACHABLE
#else
#define ANNOTATE_INTRA_FUNCTION_CALL
.macro UNWIND_HINT sp_reg:req sp_offset=0 type:req end=0
@ -161,6 +175,8 @@ struct unwind_hint {
.endm
.macro ANNOTATE_NOENDBR
.endm
.macro REACHABLE
.endm
#endif
#endif /* CONFIG_STACK_VALIDATION */

16
tools/include/linux/objtool.h
View file

@ -83,6 +83,12 @@ struct unwind_hint {
_ASM_PTR " 986b\n\t" \
".popsection\n\t"
#define ASM_REACHABLE \
"998:\n\t" \
".pushsection .discard.reachable\n\t" \
".long 998b - .\n\t" \
".popsection\n\t"
#else /* __ASSEMBLY__ */
/*
@ -142,6 +148,13 @@ struct unwind_hint {
.popsection
.endm
.macro REACHABLE
.Lhere_\@:
.pushsection .discard.reachable
.long .Lhere_\@ - .
.popsection
.endm
#endif /* __ASSEMBLY__ */
#else /* !CONFIG_STACK_VALIDATION */
@ -153,6 +166,7 @@ struct unwind_hint {
#define STACK_FRAME_NON_STANDARD(func)
#define STACK_FRAME_NON_STANDARD_FP(func)
#define ANNOTATE_NOENDBR
#define ASM_REACHABLE
#else
#define ANNOTATE_INTRA_FUNCTION_CALL
.macro UNWIND_HINT sp_reg:req sp_offset=0 type:req end=0
@ -161,6 +175,8 @@ struct unwind_hint {
.endm
.macro ANNOTATE_NOENDBR
.endm
.macro REACHABLE
.endm
#endif
#endif /* CONFIG_STACK_VALIDATION */