x86/unwind/orc: Detect the end of the stack

The existing UNWIND_HINT_EMPTY annotations happen to be good indicators
of where entry code calls into C code for the first time.  So also use
them to mark the end of the stack for the ORC unwinder.

Use that information to set unwind->error if the ORC unwinder doesn't
unwind all the way to the end.  This will be needed for enabling
HAVE_RELIABLE_STACKTRACE for the ORC unwinder so we can use it with the
livepatch consistency model.

Thanks to Jiri Slaby for teaching the ORCs about the unwind hints.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/lkml/20180518064713.26440-5-jslaby@suse.cz
Signed-off-by: Ingo Molnar <mingo@kernel.org>

This commit is contained in:

Josh Poimboeuf

2018-05-18 08:47:12 +02:00

committed by

Ingo Molnar

parent 0c414367c0

commit d31a580266

9 changed files with 52 additions and 29 deletions

									
										tools/objtool/orc_dump.c
									
		+2
		-1
	
												View File
												
				@@ -203,7 +203,8 @@ int orc_dump(const char *_objname)

						print_reg(orc[i].bp_reg, orc[i].bp_offset);

						printf(" type:%s\n", orc_type_name(orc[i].type));

						printf(" type:%s end:%d\n",

						       orc_type_name(orc[i].type), orc[i].end);

					}

					elf_end(elf);