xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

perf annotate: Add "_local" to jump/offset validation routines

Browse Source 
Because they all really check if we can access data structures/visual
constructs where a "jump" instruction targets code in the same function,
i.e. things like:

  __pthread_mutex_lock  /usr/lib64/libpthread-2.26.so
  1.95 │       mov    __pthread_force_elision,%ecx
       │    ┌──test   %ecx,%ecx
  0.07 │    ├──je     60
       │    │  test   $0x300,%esi
       │    │↓ jne    60
       │    │  or     $0x100,%esi
       │    │  mov    %esi,0x10(%rdi)
       │ 42:│  mov    %esi,%edx
       │    │  lea    0x16(%r8),%rsi
       │    │  mov    %r8,%rdi
       │    │  and    $0x80,%edx
       │    │  add    $0x8,%rsp
       │    │→ jmpq   __lll_lock_elision
       │    │  nop
  0.29 │ 60:└─→and    $0x80,%esi
  0.07 │       mov    $0x1,%edi
  0.29 │       xor    %eax,%eax
  2.53 │       lock   cmpxchg %edi,(%r8)

And not things like that "jmpq __lll_lock_elision", that instead should behave
like a "call" instruction and "jump" to the disassembly of "___lll_lock_elision".

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-3cwx39u3h66dfw9xjrlt7ca2@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
2018-03-23 10:12:33 -03:00
parent 83428f2fad
commit 2eff061162
3 changed files with 16 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
tools/perf/util/annotate.c
View File

@@ -1409,7 +1409,7 @@ static int symbol__parse_objdump_line(struct symbol *sym, FILE *file,
if (dl == NULL)
return -1;
if (!disasm_line__has_offset(dl)) {
if (!disasm_line__has_local_offset(dl)) {
dl->ops.target.offset = dl->ops.target.addr -
map__rip_2objdump(map, sym->start);
dl->ops.target.offset_avail = true;
@@ -2176,11 +2176,10 @@ size_t disasm__fprintf(struct list_head *head, FILE *fp)
return printed;
}
bool disasm_line__is_valid_jump(struct disasm_line *dl, struct symbol *sym)
bool disasm_line__is_valid_local_jump(struct disasm_line *dl, struct symbol *sym)
{
if (!dl || !dl->ins.ops || !ins__is_jump(&dl->ins) ||
!disasm_line__has_offset(dl) || dl->ops.target.offset < 0 ||
!disasm_line__has_local_offset(dl) || dl->ops.target.offset < 0 ||
dl->ops.target.offset >= (s64)symbol__size(sym))
return false;
@@ -2201,7 +2200,7 @@ void annotation__mark_jump_targets(struct annotation *notes, struct symbol *sym)
dl = disasm_line(al);
if (!disasm_line__is_valid_jump(dl, sym))
if (!disasm_line__is_valid_local_jump(dl, sym))
continue;
al = notes->offsets[dl->ops.target.offset];