Add trace events to help follow how the various files in
gdb-xml/ are parsed or generated at runtime.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 gdbstub/gdbstub.c    | 14 ++++++++++++++
 gdbstub/trace-events |  6 ++++++
 2 files changed, 20 insertions(+)

diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c
index 221951c22b0..5c1a18e055c 100644
--- a/gdbstub/gdbstub.c
+++ b/gdbstub/gdbstub.c
@@ -478,6 +478,10 @@ void gdb_feature_builder_end(const GDBFeatureBuilder *builder)
 
     builder->feature->num_regs = builder->regs->len;
     builder->feature->regs = (void *)g_ptr_array_free(builder->regs, FALSE);
+    trace_gdbxml_feature_builder_header(builder->feature->name,
+                                        builder->feature->xmlname,
+                                        builder->feature->num_regs);
+    trace_gdbxml_feature_builder_content(builder->feature->xml);
 }
 
 const GDBFeature *gdb_find_static_feature(const char *xmlname)
@@ -511,6 +515,10 @@ GArray *gdb_get_register_list(CPUState *cpu)
                 name,
                 r->feature->name
             };
+            trace_gdbxml_get_register_list(r->feature->name,
+                                           r->feature->xmlname,
+                                           r->feature->base_reg,
+                                           r->base_reg + i, name);
             g_array_append_val(results, desc);
         }
     }
@@ -563,6 +571,8 @@ static void gdb_register_feature(CPUState *cpu, int base_reg,
         .feature = feature
     };
 
+    trace_gdbxml_register_feature(feature->name, feature->xmlname,
+                                  base_reg, feature->num_regs);
     g_array_append_val(cpu->gdb_regs, s);
 }
 
@@ -598,6 +608,10 @@ void gdb_init_cpu(CPUState *cpu)
     } else {
         cpu->gdb_num_regs = cpu->gdb_num_g_regs = cc->gdb_num_core_regs;
     }
+
+    trace_gdbxml_init_cpu(object_get_typename(OBJECT(cpu)), cpu->cpu_index,
+                          cpu->gdb_num_regs, cpu->gdb_num_g_regs,
+                          cc->gdb_num_core_regs);
 }
 
 void gdb_register_coprocessor(CPUState *cpu,
diff --git a/gdbstub/trace-events b/gdbstub/trace-events
index 4fd126a38c1..8caee36c242 100644
--- a/gdbstub/trace-events
+++ b/gdbstub/trace-events
@@ -28,5 +28,11 @@ gdbstub_err_checksum_invalid(uint8_t ch) "got invalid command checksum digit: 0x
 gdbstub_err_checksum_incorrect(uint8_t expected, uint8_t got) "got command packet with incorrect checksum, expected=0x%02x, received=0x%02x"
 gdbstub_err_unexpected_runpkt(uint8_t ch) "unexpected packet (0x%02x) while target running"
 
+gdbxml_init_cpu(const char *typename, unsigned id, unsigned gdb_num_regs, unsigned gdb_num_g_regs, unsigned gdb_num_core_regs) "%s:%d regs:%u g_regs:%u core_regs:%u"
+gdbxml_register_feature(const char *featname, const char *xmlname, unsigned base_reg, unsigned num_regs) "%s (%s) @%u +%u"
+gdbxml_feature_builder_header(const char *name, const char *xmlname, int num_regs) "%s (%s) regs:%d"
+gdbxml_feature_builder_content(const char *xml) "%s"
+gdbxml_get_register_list(const char *featname, const char *xmlname, unsigned feat_base_reg, unsigned base_reg, const char *regname) "%s (%s) [%u,%u]:%s"
+
 # system.c
 gdbstub_hit_watchpoint(const char *type, int cpu_gdb_index, uint64_t vaddr) "Watchpoint hit, type=\"%s\" cpu=%d, vaddr=0x%" PRIx64 ""
-- 
2.53.0