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| author | Peter Zijlstra <peterz@infradead.org> | 2021-05-06 21:34:04 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2021-05-12 14:54:56 +0200 |
| commit | e2d9494beff21a26438eb611c260b8a6c2dc4dbf (patch) | |
| tree | ad56a49b4db85c20a1f5ecfbf9639492f8cf38ab /tools/objtool | |
| parent | 6d37b83c5d79ef5996cc49c3e3ac3d8ecd8c7050 (diff) | |
| download | linux-e2d9494beff21a26438eb611c260b8a6c2dc4dbf.tar.gz | |
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/objtool')
| -rw-r--r-- | tools/objtool/check.c | 22 | ||||
| -rw-r--r-- | tools/objtool/include/objtool/objtool.h | 3 |
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); |