hvf: add guest debugging handlers for Apple Silicon hosts

Guests can now be debugged through the gdbstub. Support is added for
single-stepping, software breakpoints, hardware breakpoints and
watchpoints. The code has been structured like the KVM counterpart.

While guest debugging is enabled, the guest can still read and write the
DBG*_EL1 registers but they don't have any effect.

Signed-off-by: Francesco Cagnin <fcagnin@quarkslab.com>
Message-id: 20230601153107.81955-5-fcagnin@quarkslab.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/accel/hvf/hvf-all.c b/accel/hvf/hvf-all.c
index e983c23ad7..754707dbfb 100644
--- a/accel/hvf/hvf-all.c
+++ b/accel/hvf/hvf-all.c
@@ -61,3 +61,9 @@ int hvf_sw_breakpoints_active(CPUState *cpu)
 {
     return !QTAILQ_EMPTY(&hvf_state->hvf_sw_breakpoints);
 }
+
+int hvf_update_guest_debug(CPUState *cpu)
+{
+    hvf_arch_update_guest_debug(cpu);
+    return 0;
+}