perf annotate-arm64: Support 'mov' instruction tracking

Extend update_insn_state_arm64() to support register-to-register and
immediate-to-register 'mov' instructions.

For register-to-register 'mov' (e.g., mov dreg, sreg), propagate data type
information from the source register to the destination register.

For immediate-to-register 'mov' (e.g., mov dreg, #imm), store the immediate
value in the destination register's imm_value field and set its kind to
TSR_KIND_CONST, allowing subsequent instructions to resolve it as a
constant.

A real-world example is shown below:

  ffff8000803eebf8 <get_vma_policy>:
  ffff8000803eec20:  mov  x21, x0          // x0 (struct vm_area_struct*) -> x21
  ffff8000803eec28:  ldr  x2, [x0, #112]
  ffff8000803eec2c:  cbz  x2, ffff8000803eec94 <get_vma_policy+0x9c>
* ffff8000803eec94:  ldr  x0, [x21, #152]

Before this commit, the type of x21 was unknown, causing the subsequent
inference to fail:

  var [0] reg0 offset 0 type='struct vm_area_struct*' size=0x8
  chk [9c] reg21 offset=0x98 ok=0 kind=0 cfa : no type information
  final result: no type information

After this commit, the type of x21 is correctly inferred as 'vm_area_struct':

  var [0] reg0 offset 0 type='struct vm_area_struct*' size=0x8
  mov [28] reg0 -> reg21 type='struct vm_area_struct*' size=0x8
  chk [9c] reg21 offset=0x98 ok=1 kind=1 (struct vm_area_struct*) : Good!
  found by insn track: 0x98(reg21) type-offset=0x98
  final result:  type='struct vm_area_struct' size=0xb0

Reviewed-by: Ian Rogers <irogers@google.com>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
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