perf annotate-arm64: Support 'adrp' instruction to track global variables

Extend update_insn_state_arm64() to track global variable types
calculated via page-relative addressing.

On arm64, global variables are typically accessed by first calculating
the page address using 'adrp', followed by an 'add' or 'ldr' to get the
specific symbol address. Without tracking 'adrp', the instruction
tracker loses the base address, making it impossible to resolve
global symbols and their associated DWARF types.

Introduce TSR_KIND_GLOBAL_ADDR to represent a partial global address
state. When encountering 'adrp', store the page-aligned target address
in the register's type state. Upon a subsequent 'add' or 'ldr'
instruction that references a TSR_KIND_GLOBAL_ADDR register, combine
the page address with the immediate offset.

A real-world example is shown below:

  ffff80008032e008 <folios_put_refs>:
  ffff80008032e048:  adrp  x24, ffff80008202f000 <nr_cpu_ids>
  ffff80008032e050:  add   x24, x24, #0xd40
* ffff80008032e078:  ldr   x0, [x24]

Before this commit, x24 was unknown, leading to no type information:

  chk [70] reg24 offset=0 ok=0 kind=0 cfa : no type information
  final result: no type information

After this commit, the tracker correctly follows the adrp/add flow:

  adrp [40] global addr=0xffff80008202f000 -> reg24
  add [48] global 0xd40(reg24) -> reg24
  chk [70] reg24 offset=0 ok=1 kind=7 global addr : Good!
  final result: type='struct folio*'

Reviewed-by: Ian Rogers <irogers@google.com>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Li Huafei <lihuafei1@huawei.com>
Signed-off-by: Tengda Wu <wutengda@huaweicloud.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

0 files changed, 0 insertions, 0 deletions