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authorPeter Zijlstra <peterz@infradead.org>2018-01-16 10:24:06 +0100
committerIngo Molnar <mingo@kernel.org>2018-02-21 09:05:04 +0100
commitb5bc2231b8ad4387c9641f235ca0ad8cd300b6df (patch)
treea6ce9e09e9f1424f9506bf8b1ba375c88a044a76 /tools/objtool/builtin-check.c
parent43a4525f80534530077683f6472d8971646b0ace (diff)
downloadlinux-b5bc2231b8ad4387c9641f235ca0ad8cd300b6df.tar.bz2
objtool: Add retpoline validation
David requested a objtool validation pass for CONFIG_RETPOLINE=y enabled builds, where it validates no unannotated indirect jumps or calls are left. Add an additional .discard.retpoline_safe section to allow annotating the few indirect sites that are required and safe. Requested-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: David Woodhouse <dwmw@amazon.co.uk> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/objtool/builtin-check.c')
-rw-r--r--tools/objtool/builtin-check.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index 8d0986d2a803..dd6bcd6097f5 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -29,7 +29,7 @@
#include "builtin.h"
#include "check.h"
-bool no_fp, no_unreachable;
+bool no_fp, no_unreachable, retpoline;
static const char * const check_usage[] = {
"objtool check [<options>] file.o",
@@ -39,6 +39,7 @@ static const char * const check_usage[] = {
const struct option check_options[] = {
OPT_BOOLEAN('f', "no-fp", &no_fp, "Skip frame pointer validation"),
OPT_BOOLEAN('u', "no-unreachable", &no_unreachable, "Skip 'unreachable instruction' warnings"),
+ OPT_BOOLEAN('r', "retpoline", &retpoline, "Validate retpoline assumptions"),
OPT_END(),
};