From 99d0021569c71c325f41a7dd0a08a380010ce95c Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Thu, 6 Aug 2020 15:14:09 -0700 Subject: objtool: Add a pass for generating __mcount_loc Add the --mcount option for generating __mcount_loc sections needed for dynamic ftrace. Using this pass requires the kernel to be compiled with -mfentry and CC_USING_NOP_MCOUNT to be defined in Makefile. Link: https://lore.kernel.org/lkml/20200625200235.GQ4781@hirez.programming.kicks-ass.net/ Signed-off-by: Peter Zijlstra [Sami: rebased, dropped config changes, fixed to actually use --mcount, and wrote a commit message.] Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- tools/objtool/objtool.c | 1 + 1 file changed, 1 insertion(+) (limited to 'tools/objtool/objtool.c') diff --git a/tools/objtool/objtool.c b/tools/objtool/objtool.c index 9df0cd86d310..c1819a6f2a18 100644 --- a/tools/objtool/objtool.c +++ b/tools/objtool/objtool.c @@ -62,6 +62,7 @@ struct objtool_file *objtool_open_read(const char *_objname) INIT_LIST_HEAD(&file.insn_list); hash_init(file.insn_hash); INIT_LIST_HEAD(&file.static_call_list); + INIT_LIST_HEAD(&file.mcount_loc_list); file.c_file = !vmlinux && find_section_by_name(file.elf, ".comment"); file.ignore_unreachables = no_unreachable; file.hints = false; -- cgit v1.2.3