gdbstub: Expose TARGET_SIGTRAP in a target-agnostic way

The upcoming syscall catchpoint support needs to send SIGTRAP stop
packets to GDB. Being able to compile this support only once for all
targets is a good thing, and it requires hiding TARGET_SIGTRAP behind
a function call.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20240202152506.279476-2-iii@linux.ibm.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240207163812.3231697-11-alex.bennee@linaro.org>

gdbstub/internals.h

@@ -136,6 +136,7 @@ void gdb_append_thread_id(CPUState *cpu, GString *buf);
 int gdb_get_cpu_index(CPUState *cpu);
 unsigned int gdb_get_max_cpus(void); /* both */
 bool gdb_can_reverse(void); /* softmmu, stub for user */
+int gdb_target_sigtrap(void); /* user */
 
 void gdb_create_default_process(GDBState *s);
 

gdbstub/user-target.c

@@ -418,3 +418,8 @@ void gdb_handle_query_xfer_exec_file(GArray *params, void *user_ctx)
                     ts->bprm->filename + offset);
     gdb_put_strbuf();
 }
+
+int gdb_target_sigtrap(void)
+{
+    return TARGET_SIGTRAP;
+}