2019-05-30 08:03:44 -04:00
|
|
|
# SPDX-License-Identifier: GPL-2.0
|
2007-10-11 05:20:03 -04:00
|
|
|
|
2011-11-11 19:07:41 -05:00
|
|
|
|
x86/unwind/orc: Add ELF section with ORC version identifier
Commits ffb1b4a41016 ("x86/unwind/orc: Add 'signal' field to ORC
metadata") and fb799447ae29 ("x86,objtool: Split UNWIND_HINT_EMPTY in
two") changed the ORC format. Although ORC is internal to the kernel,
it's the only way for external tools to get reliable kernel stack traces
on x86-64. In particular, the drgn debugger [1] uses ORC for stack
unwinding, and these format changes broke it [2]. As the drgn
maintainer, I don't care how often or how much the kernel changes the
ORC format as long as I have a way to detect the change.
It suffices to store a version identifier in the vmlinux and kernel
module ELF files (to use when parsing ORC sections from ELF), and in
kernel memory (to use when parsing ORC from a core dump+symbol table).
Rather than hard-coding a version number that needs to be manually
bumped, Peterz suggested hashing the definitions from orc_types.h. If
there is a format change that isn't caught by this, the hashing script
can be updated.
This patch adds an .orc_header allocated ELF section containing the
20-byte hash to vmlinux and kernel modules, along with the corresponding
__start_orc_header and __stop_orc_header symbols in vmlinux.
1: https://github.com/osandov/drgn
2: https://github.com/osandov/drgn/issues/303
Fixes: ffb1b4a41016 ("x86/unwind/orc: Add 'signal' field to ORC metadata")
Fixes: fb799447ae29 ("x86,objtool: Split UNWIND_HINT_EMPTY in two")
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lkml.kernel.org/r/aef9c8dc43915b886a8c48509a12ec1b006ca1ca.1686690801.git.osandov@osandov.com
2023-06-13 17:14:56 -04:00
|
|
|
generated-y += orc_hash.h
|
2016-06-24 18:42:23 -04:00
|
|
|
generated-y += syscalls_32.h
|
|
|
|
generated-y += syscalls_64.h
|
2021-05-17 03:38:10 -04:00
|
|
|
generated-y += syscalls_x32.h
|
2016-06-24 18:42:23 -04:00
|
|
|
generated-y += unistd_32_ia32.h
|
|
|
|
generated-y += unistd_64_x32.h
|
|
|
|
generated-y += xen-hypercalls.h
|
|
|
|
|
2014-08-08 17:23:25 -04:00
|
|
|
generic-y += early_ioremap.h
|
2014-01-21 18:36:22 -05:00
|
|
|
generic-y += mcs_spinlock.h
|