gdbstub: specialise target_memory_rw_debug

The two implementations are different enough to encourage having a
specialisation and we can move some of the softmmu only stuff out of
gdbstub.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230302190846.2593720-16-alex.bennee@linaro.org>
Message-Id: <20230303025805.625589-16-richard.henderson@linaro.org>
diff --git a/gdbstub/user.c b/gdbstub/user.c
index c0fd83b..92663d9 100644
--- a/gdbstub/user.c
+++ b/gdbstub/user.c
@@ -379,6 +379,21 @@
 }
 
 /*
+ * Memory access helpers
+ */
+int gdb_target_memory_rw_debug(CPUState *cpu, hwaddr addr,
+                               uint8_t *buf, int len, bool is_write)
+{
+    CPUClass *cc;
+
+    cc = CPU_GET_CLASS(cpu);
+    if (cc->memory_rw_debug) {
+        return cc->memory_rw_debug(cpu, addr, buf, len, is_write);
+    }
+    return cpu_memory_rw_debug(cpu, addr, buf, len, is_write);
+}
+
+/*
  * Break/Watch point helpers
  */