bsd-user: Add stubs for new signal routines

Until the signal support is merged from the bsd-user fork, we need stubs
for cpu_loop_exit_sigsegv and cpu_loop_exit_sigbus to link. These call
abort after logging a message. Since singals aren't supported here
yet, this is sufficient.

Signed-off-by: Warner Losh <imp@bsdimp.com>
Message-Id: <20211102225248.52999-2-imp@bsdimp.com>
Tested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

bsd-user/signal.c

@@ -20,6 +20,11 @@
 #include "qemu/osdep.h"
 #include "qemu.h"
 
+/*
+ * Stubbed out routines until we merge signal support from bsd-user
+ * fork.
+ */
+
 /*
  * Queue a signal so that it will be send to the virtual CPU as soon as
  * possible.
@@ -36,3 +41,19 @@ void signal_init(void)
 void process_pending_signals(CPUArchState *cpu_env)
 {
 }
+
+void cpu_loop_exit_sigsegv(CPUState *cpu, target_ulong addr,
+                           MMUAccessType access_type, bool maperr, uintptr_t ra)
+{
+    qemu_log_mask(LOG_UNIMP, "No signal support for SIGSEGV\n");
+    /* unreachable */
+    abort();
+}
+
+void cpu_loop_exit_sigbus(CPUState *cpu, target_ulong addr,
+                          MMUAccessType access_type, uintptr_t ra)
+{
+    qemu_log_mask(LOG_UNIMP, "No signal support for SIGBUS\n");
+    /* unreachable */
+    abort();
+}