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[v4,04/10] livepatch: Add klp-convert annotation helpers

Message ID 20190509143859.9050-5-joe.lawrence@redhat.com (mailing list archive)
State New, archived
Headers show
Series klp-convert livepatch build tooling | expand

Commit Message

Joe Lawrence May 9, 2019, 2:38 p.m. UTC 
From: Josh Poimboeuf <jpoimboe@redhat.com>

Define macros KLP_MODULE_RELOC and KLP_SYMPOS in
include/linux/livepatch.h to improve user-friendliness of the
livepatch annotation process.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Joao Moreira <jmoreira@suse.de>
Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
---
 include/linux/livepatch.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
index 16b48e8b29a2..3071aec8fd72 100644
--- a/include/linux/livepatch.h
+++ b/include/linux/livepatch.h
@@ -236,6 +236,18 @@  void *klp_shadow_get_or_alloc(void *obj, unsigned long id,
 void klp_shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor);
 void klp_shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor);
 
+/* Used to annotate symbol relocations in livepatches */
+#define KLP_MODULE_RELOC(obj)						\
+	struct klp_module_reloc						\
+	__attribute__((__section__(".klp.module_relocs." #obj)))	\
+	__attribute__((aligned (4)))
+
+#define KLP_SYMPOS(symbol, pos)						\
+	{								\
+		.sym = &symbol,						\
+		.sympos = pos,						\
+	}
+
 #else /* !CONFIG_LIVEPATCH */
 
 static inline int klp_module_coming(struct module *mod) { return 0; }