Make the stacktrace more effective and the codes more clear.

v3:
  Make unwind_{guess,prologue}.c as frontend and share unwind.c.
  Drop unwind ops and reenable unwind type for clear logic.

v2:
  Directly use unwinder_guess when register unwinder.
  Drop unwind type.
  Drop patch which add raw_show_trace parameter.
  Handle task == NULL case in unwind_start.

  Thanks for Qing and Huacai.

Jinyang He (5):
  LoongArch: Get frame info in unwind_start when regs is not supported
  LoongArch: Use correct sp value to get graph addr in unwinder guess
  LoongArch: Adjust PC value when unwind next frame in prologue unwinder
  LoongArch: Strip guess_unwinder out from prologue_unwinder
  LoongArch: Add generic ex-handler unwind in prologue unwinder

 arch/loongarch/include/asm/ftrace.h     |   2 -
 arch/loongarch/include/asm/unwind.h     |  40 +++-
 arch/loongarch/kernel/Makefile          |   2 +-
 arch/loongarch/kernel/genex.S           |   3 +
 arch/loongarch/kernel/process.c         |  12 +-
 arch/loongarch/kernel/traps.c           |   3 -
 arch/loongarch/kernel/unwind.c          |  33 ++++
 arch/loongarch/kernel/unwind_guess.c    |  49 +----
 arch/loongarch/kernel/unwind_prologue.c | 247 ++++++++++++++----------
 arch/loongarch/mm/tlb.c                 |   2 +-
 10 files changed, 232 insertions(+), 161 deletions(-)
 create mode 100644 arch/loongarch/kernel/unwind.c

-- 
2.34.3