[PATCH 0/5] arm64: stack backtraces

[Heinrich Schuchardt]

On RISC-V we already can show backtraces if CONFIG_FRAMEPOINTER=y or
CONFIG_SPL_FRAMEPOINTER=y. Extend this functionality to arm64.

Show all 64 bits of the exception syndrom register esr.

Here is an example output:

    => exception undefined
    "Synchronous Abort" handler, esr 0x0000000002000000
    elr: 000000000002c258 lr : 000000000003967c (reloc)
    elr: 000000007f6c8258 lr : 000000007f6d567c
    x0 : 000000007f7c0200 x1 : 0000000000000000
    x2 : 0000000000000001 x3 : 000000007e662988
    x4 : 000000007f6c8258 x5 : 000000007e6629c0
    x6 : 0000000000000064 x7 : 0000000000000000
    x8 : 00000000ffffffd8 x9 : 6db6db6db6db6db7
    x10: 000000000000000d x11: 0000000000000006
    x12: 000000007e558ef8 x13: 000000007e55bdc0
    x14: 0000000000000000 x15: 000000007e558aac
    x16: 000000007f6c8258 x17: 0000000000000000
    x18: 000000007e65bdc0 x19: 000000007f7c0200
    x20: 0000000000000000 x21: 0000000000000000
    x22: 000000007e662980 x23: 0000000000000002
    x24: 000000007f7d5304 x25: 0000000000000000
    x26: 0000000000000000 x27: 000000007e6629e0
    x28: 000000007e662980 x29: 000000007e558d80

    Code: 97ffff63 a94153f3 a8c37bfd d65f03c0 (00001234)

    backtrace:
      0: fp: 000000007e558d80 lr: 000000007f6cad20 - 000000000002ed20 (reloc)
      1: fp: 000000007e558de0 lr: 000000007f6caeac - 000000000002eeac (reloc)
      2: fp: 000000007e558e90 lr: 000000007f6cb3f0 - 000000000002f3f0 (reloc)
      3: fp: 000000007e558f50 lr: 000000007f6d4af8 - 0000000000038af8 (reloc)
      4: fp: 000000007e558f80 lr: 000000007f6c847c - 000000000002c47c (reloc)
      5: fp: 000000007e558f90 lr: 000000007f6cc028 - 0000000000030028 (reloc)
      6: fp: 000000007e558fb0 lr: 000000007f69f010 - 0000000000003010 (reloc)

    Resetting CPU ...

    resetting ...

Heinrich Schuchardt (5):
  cmd/exception: missing include string.h
  arm64: initialize the frame pointer register
  arm64: implement printing backtraces
  Kconfig: make CONFIG_FRAMEPOINTER available on arm64
  arm64: simplify interrupt code

 Kconfig                      | 25 ++++++++++
 arch/arm/Makefile            |  9 +++-
 arch/arm/lib/crt0_64.S       |  1 +
 arch/arm/lib/interrupts_64.c | 94 ++++++++++++++++++++++--------------
 arch/riscv/Kconfig           | 21 --------
 include/exception.h          |  1 +
 6 files changed, 93 insertions(+), 58 deletions(-)

-- 
2.48.1