[PATCH 0/3] gdbstub: Implement follow-fork-mode child

[Ilya Leoshkevich <iii@linux.ibm.com>]

Based-on: <20240116094411.216665-1-iii@linux.ibm.com>

Hi,

I needed to debug a linux-user crash between fork() and exec() [1] and
realized that gdbstub does not allow this. This series lifts this
restriction (one still cannot debug past exec() though). Patch 1 is a
preliminary refactoring, I can split it if necessary. Patch 2 is the
implementation, and patch 3 is the test.

[1] https://lists.gnu.org/archive/html/qemu-devel/2024-01/msg06424.html

Best regards,
Ilya

Ilya Leoshkevich (3):
  gdbstub: Refactor fork() handling
  gdbstub: Implement follow-fork-mode child
  tests/tcg: Add two follow-fork-mode tests

 bsd-user/freebsd/os-proc.h                    |   6 +-
 bsd-user/main.c                               |   8 +-
 bsd-user/qemu.h                               |   2 +-
 gdbstub/gdbstub.c                             |  29 ++-
 gdbstub/internals.h                           |   3 +
 gdbstub/user.c                                | 225 +++++++++++++++++-
 include/gdbstub/user.h                        |  11 +-
 linux-user/main.c                             |   8 +-
 linux-user/syscall.c                          |   4 +-
 linux-user/user-internals.h                   |   2 +-
 tests/tcg/multiarch/Makefile.target           |  17 +-
 tests/tcg/multiarch/follow-fork-mode.c        |  56 +++++
 .../gdbstub/follow-fork-mode-child.py         |  40 ++++
 .../gdbstub/follow-fork-mode-parent.py        |  16 ++
 14 files changed, 403 insertions(+), 24 deletions(-)
 create mode 100644 tests/tcg/multiarch/follow-fork-mode.c
 create mode 100644 tests/tcg/multiarch/gdbstub/follow-fork-mode-child.py
 create mode 100644 tests/tcg/multiarch/gdbstub/follow-fork-mode-parent.py

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2.43.0