[PATCH 0/2] gdbstub: don't crash if no gdb attached and gdb syscall attempted

[Peter Maydell]

This patchset fixes a couple of bugs reported by
Liviu Ionescu related to semihosting syscall handling.

Firstly, if the user sets up the gdbstub but doesn't connect a gdb
(ie passes '-s' but not '-S'), and we try to use gdb for semihosting
syscalls (either because the user explicitly set target=gdb or else
via autodetection) then we currently segfault.  This patch adjusts
the behaviour so that "gdbstub initialized but no gdb attached to a
vCPU" is treated the same way we already treat "gdbstub not
initialized".

Secondly, we weren't handling commandlines where
--semihosting-config appears multiple times: these ought to be
merged together but instead we were effectively ignoring
all but the last one.

thanks
-- PMM

Peter Maydell (2):
  gdbstub: Don't use GDB syscalls if no GDB is attached
  semihosting/config: Merge --semihosting-config option groups

 gdbstub.c            | 14 +++++++++++---
 semihosting/config.c |  1 +
 2 files changed, 12 insertions(+), 3 deletions(-)

-- 
2.25.1