gdbstub: Remove gdb_has_xml variable

GDB has XML support since 6.7 which was released in 2007.
It's time to remove support for old GDB versions without XML support.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20230912224107.29669-12-akihiko.odaki@daynix.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20231009164104.369749-19-alex.bennee@linaro.org>

gdbstub/gdbstub.c

@@ -349,11 +349,6 @@ static CPUState *gdb_get_cpu(uint32_t pid, uint32_t tid)
     }
 }
 
-bool gdb_has_xml(void)
-{
-    return !!gdb_get_cpu_process(gdbserver_state.g_cpu)->target_xml;
-}
-
 static const char *get_feature_xml(const char *p, const char **newp,
                                    GDBProcess *process)
 {
@@ -1086,11 +1081,6 @@ static void handle_set_reg(GArray *params, void *user_ctx)
 {
     int reg_size;
 
-    if (!gdb_get_cpu_process(gdbserver_state.g_cpu)->target_xml) {
-        gdb_put_packet("");
-        return;
-    }
-
     if (params->len != 2) {
         gdb_put_packet("E22");
         return;
@@ -1107,11 +1097,6 @@ static void handle_get_reg(GArray *params, void *user_ctx)
 {
     int reg_size;
 
-    if (!gdb_get_cpu_process(gdbserver_state.g_cpu)->target_xml) {
-        gdb_put_packet("");
-        return;
-    }
-
     if (!params->len) {
         gdb_put_packet("E14");
         return;

gdbstub/internals.h

@@ -32,8 +32,6 @@ enum {
 typedef struct GDBProcess {
     uint32_t pid;
     bool attached;
-
-    /* If gdb sends qXfer:features:read:target.xml this will be populated */
     char *target_xml;
 } GDBProcess;
 

include/exec/gdbstub.h

@@ -45,14 +45,6 @@ int gdbserver_start(const char *port_or_device);
 
 void gdb_set_stop_cpu(CPUState *cpu);
 
-/**
- * gdb_has_xml() - report of gdb supports modern target descriptions
- *
- * This will report true if the gdb negotiated qXfer:features:read
- * target descriptions.
- */
-bool gdb_has_xml(void);
-
 /* in gdbstub-xml.c, generated by scripts/feature_to_c.py */
 extern const GDBFeature gdb_static_features[];