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, 9 insertions, 0 deletions

diff --git a/target/i386/hvf/hvf.c b/target/i386/hvf/hvf.c
index 08bc96ecbc..f6775c942a 100644
--- a/target/i386/hvf/hvf.c
+++ b/target/i386/hvf/hvf.c
@@ -703,3 +703,12 @@ int hvf_arch_remove_hw_breakpoint(target_ulong addr, target_ulong len, int type)
 void hvf_arch_remove_all_hw_breakpoints(void)
 {
 }
+
+void hvf_arch_update_guest_debug(CPUState *cpu)
+{
+}
+
+inline bool hvf_arch_supports_guest_debug(void)
+{
+    return false;
+}