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| author | Peter Zijlstra <peterz@infradead.org> | 2018-01-16 10:24:06 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-02-21 09:05:04 +0100 |
| commit | b5bc2231b8ad4387c9641f235ca0ad8cd300b6df (patch) | |
| tree | a6ce9e09e9f1424f9506bf8b1ba375c88a044a76 /tools/objtool/builtin-check.c | |
| parent | 43a4525f80534530077683f6472d8971646b0ace (diff) | |
| download | linux-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.c | 3 |
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(), }; |