perf annotate-data: Handle ADD instructions

There are different patterns for percpu variable access using a constant
value added to the base.

  2aeb:  mov    -0x7da0f7e0(,%rax,8),%r14  # r14 = __per_cpu_offset[cpu]
  2af3:  mov    $0x34740,%rax              # rax = address of runqueues
* 2afa:  add    %rax,%r14                  # r14 = &per_cpu(runqueues, cpu)
  2bfd:  cmpl   $0x0,0x10(%r14)            # cpu_rq(cpu)->has_blocked_load
  2b03:  je     0x2b36

At the first instruction, r14 has the __per_cpu_offset.  And then rax
has an immediate value and then added to r14 to calculate the address of
a per-cpu variable.  So it needs to track the immediate values and ADD
instructions.

Similar but a little different case is to use "this_cpu_off" instead of
"__per_cpu_offset" for the current CPU.  This time the variable address
comes with PC-rel addressing.

  89:  mov     $0x34740,%rax                # rax = address of runqueues
* 90:  add     %gs:0x7f015f60(%rip),%rax    # 19a78  <this_cpu_off>
  98:  incl    0xd8c(%rax)                  # cpu_rq(cpu)->sched_count

Signed-off-by: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

0 files changed, 0 insertions, 0 deletions