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authorPeter Zijlstra <peterz@infradead.org>2021-05-06 22:34:04 +0300
committerIngo Molnar <mingo@kernel.org>2021-05-12 15:54:56 +0300
commite2d9494beff21a26438eb611c260b8a6c2dc4dbf (patch)
treead56a49b4db85c20a1f5ecfbf9639492f8cf38ab /tools
parent6d37b83c5d79ef5996cc49c3e3ac3d8ecd8c7050 (diff)
downloadlinux-e2d9494beff21a26438eb611c260b8a6c2dc4dbf.tar.xz
objtool: Provide stats for jump_labels
Add objtool --stats to count the jump_label sites it encounters. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20210506194158.153101906@infradead.org
Diffstat (limited to 'tools')
-rw-r--r--tools/objtool/check.c22
-rw-r--r--tools/objtool/include/objtool/objtool.h3
2 files changed, 23 insertions, 2 deletions
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 98cf87f2c501..2c6a93edf27e 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1225,8 +1225,15 @@ static int handle_jump_alt(struct objtool_file *file,
struct instruction *orig_insn,
struct instruction **new_insn)
{
- if (orig_insn->type == INSN_NOP)
+ if (orig_insn->type == INSN_NOP) {
+do_nop:
+ if (orig_insn->len == 2)
+ file->jl_nop_short++;
+ else
+ file->jl_nop_long++;
+
return 0;
+ }
if (orig_insn->type != INSN_JUMP_UNCONDITIONAL) {
WARN_FUNC("unsupported instruction at jump label",
@@ -1245,9 +1252,14 @@ static int handle_jump_alt(struct objtool_file *file,
orig_insn->offset, orig_insn->len,
arch_nop_insn(orig_insn->len));
orig_insn->type = INSN_NOP;
- return 0;
+ goto do_nop;
}
+ if (orig_insn->len == 2)
+ file->jl_short++;
+ else
+ file->jl_long++;
+
*new_insn = list_next_entry(orig_insn, list);
return 0;
}
@@ -1328,6 +1340,12 @@ static int add_special_section_alts(struct objtool_file *file)
free(special_alt);
}
+ if (stats) {
+ printf("jl\\\tNOP\tJMP\n");
+ printf("short:\t%ld\t%ld\n", file->jl_nop_short, file->jl_short);
+ printf("long:\t%ld\t%ld\n", file->jl_nop_long, file->jl_long);
+ }
+
out:
return ret;
}
diff --git a/tools/objtool/include/objtool/objtool.h b/tools/objtool/include/objtool/objtool.h
index e4084afb2304..24fa83634de4 100644
--- a/tools/objtool/include/objtool/objtool.h
+++ b/tools/objtool/include/objtool/objtool.h
@@ -22,6 +22,9 @@ struct objtool_file {
struct list_head static_call_list;
struct list_head mcount_loc_list;
bool ignore_unreachables, c_file, hints, rodata;
+
+ unsigned long jl_short, jl_long;
+ unsigned long jl_nop_short, jl_nop_long;
};
struct objtool_file *objtool_open_read(const char *_objname);