mbox series

[kvm-unit-tests,v2,0/6] arm64: improve debuggability

Message ID 20230625230716.2922-1-namit@vmware.com (mailing list archive)
Headers show
Series arm64: improve debuggability | expand

Message

Nadav Amit June 25, 2023, 11:07 p.m. UTC 
From: Nadav Amit <namit@vmware.com>

My recent experience in debugging ARM64 tests on EFI was not as fun as I
expected it to be.

There were several reasons for that besides the questionable definition
of "fun":

1. ARM64 is not compiled with frame pointers and there is no stack
   unwinder when the stack is dumped.

2. Building an EFI drops the debug information.

3. The addresses that are printed on dump_stack() and the use of GDB
   are hard because taking code relocation into account is non trivial.

The patches help both ARM64 and EFI for this matter. The image address
is printed when EFI is used to allow the use of GDB. Symbols are emitted
into a separate debug file. The frame pointer is included and special
entry is added upon an exception to allow backtracing across
exceptions.

v1->v2:
* Andrew comments [see in individual patches]
* Few cleanups

Nadav Amit (6):
  efi: keep efi debug information in a separate file
  lib/stack: print base addresses on efi
  arm64: enable frame pointer and support stack unwinding
  arm64: stack: update trace stack on exception
  efi: print address of image
  arm64: dump stack on bad exception

 arm/Makefile.arm        |  3 --
 arm/Makefile.arm64      |  1 +
 arm/Makefile.common     |  8 +++++-
 arm/cstart64.S          | 13 +++++++++
 configure               |  3 ++
 lib/arm64/asm-offsets.c |  6 +++-
 lib/arm64/asm/stack.h   |  3 ++
 lib/arm64/processor.c   |  1 +
 lib/arm64/stack.c       | 62 +++++++++++++++++++++++++++++++++++++++++
 lib/efi.c               |  4 +++
 lib/stack.c             | 31 +++++++++++++++++++--
 x86/Makefile.common     |  5 +++-
 12 files changed, 132 insertions(+), 8 deletions(-)
 create mode 100644 lib/arm64/stack.c