From 627fce14809ba5610b0cb476cd0186d3fcedecfc Mon Sep 17 00:00:00 2001 From: Josh Poimboeuf Date: Tue, 11 Jul 2017 10:33:42 -0500 Subject: objtool: Add ORC unwind table generation Now that objtool knows the states of all registers on the stack for each instruction, it's straightforward to generate debuginfo for an unwinder to use. Instead of generating DWARF, generate a new format called ORC, which is more suitable for an in-kernel unwinder. See Documentation/x86/orc-unwinder.txt for a more detailed description of this new debuginfo format and why it's preferable to DWARF. Signed-off-by: Josh Poimboeuf Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Jiri Slaby Cc: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: live-patching@vger.kernel.org Link: http://lkml.kernel.org/r/c9b9f01ba6c5ed2bdc9bb0957b78167fdbf9632e.1499786555.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar --- tools/objtool/objtool.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'tools/objtool/objtool.c') diff --git a/tools/objtool/objtool.c b/tools/objtool/objtool.c index ecc5b1b5d15d..31e0f9143840 100644 --- a/tools/objtool/objtool.c +++ b/tools/objtool/objtool.c @@ -42,10 +42,11 @@ struct cmd_struct { }; static const char objtool_usage_string[] = - "objtool [OPTIONS] COMMAND [ARGS]"; + "objtool COMMAND [ARGS]"; static struct cmd_struct objtool_cmds[] = { {"check", cmd_check, "Perform stack metadata validation on an object file" }, + {"orc", cmd_orc, "Generate in-place ORC unwind tables for an object file" }, }; bool help; -- cgit v1.2.1