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objtool: Generic annotation infrastructure

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Avoid endless .discard.foo sections for each annotation, create a
single .discard.annotate_insn section that takes an annotation type along
with the instruction.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/r/20241128094310.932794537@infradead.org
This commit is contained in:
Peter Zijlstra
2024-11-28 10:38:52 +01:00
parent 40384c840e
commit 2116b349e2
2 changed files with 63 additions and 0 deletions
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18
include/linux/objtool.h
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@@ -57,6 +57,13 @@
".long 998b\n\t" \
".popsection\n\t"
#define ASM_ANNOTATE(type) \
"911:\n\t" \
".pushsection .discard.annotate_insn,\"M\",@progbits,8\n\t" \
".long 911b - .\n\t" \
".long " __stringify(type) "\n\t" \
".popsection\n\t"
#else /* __ASSEMBLY__ */
/*
@@ -146,6 +153,14 @@
.popsection
.endm
.macro ANNOTATE type:req
.Lhere_\@:
.pushsection .discard.annotate_insn,"M",@progbits,8
.long .Lhere_\@ - .
.long \type
.popsection
.endm
#endif /* __ASSEMBLY__ */
#else /* !CONFIG_OBJTOOL */
@@ -155,6 +170,7 @@
#define UNWIND_HINT(type, sp_reg, sp_offset, signal) "\n\t"
#define STACK_FRAME_NON_STANDARD(func)
#define STACK_FRAME_NON_STANDARD_FP(func)
#define ASM_ANNOTATE(type)
#define ANNOTATE_NOENDBR
#define ASM_REACHABLE
#else
@@ -167,6 +183,8 @@
.endm
.macro REACHABLE
.endm
.macro ANNOTATE type:req
.endm
#endif
#endif /* CONFIG_OBJTOOL */