[PATCH v2 1/2] src/plugins: add helper functions for drcov

[NDNF]

This patch adds helper functions to the drcov plugin.
Which provide information about:
- start_code.
- end_code.
- entry.
- path to the executable binary.

Signed-off-by: Ivanov Arkady <arkadiy.ivanov@ispras.ru>
---
 include/qemu/qemu-plugin.h   |    5 +++++
 plugins/api.c                |   27 +++++++++++++++++++++++++++
 plugins/qemu-plugins.symbols |    4 ++++
 3 files changed, 36 insertions(+)

diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h
index 5775e82c4e..807d932e02 100644
--- a/include/qemu/qemu-plugin.h
+++ b/include/qemu/qemu-plugin.h
@@ -405,4 +405,9 @@ int qemu_plugin_n_max_vcpus(void);
  */
 void qemu_plugin_outs(const char *string);
 
+QEMU_PLUGIN_EXPORT const char *qemu_plugin_path_to_binary(void);
+QEMU_PLUGIN_EXPORT uint64_t qemu_plugin_start_code(void);
+QEMU_PLUGIN_EXPORT uint64_t qemu_plugin_end_code(void);
+QEMU_PLUGIN_EXPORT uint64_t qemu_plugin_entry_code(void);
+
 #endif /* QEMU_PLUGIN_API_H */
diff --git a/plugins/api.c b/plugins/api.c
index bbdc5a4eb4..4e8a582d58 100644
--- a/plugins/api.c
+++ b/plugins/api.c
@@ -340,3 +340,30 @@ void qemu_plugin_outs(const char *string)
 {
     qemu_log_mask(CPU_LOG_PLUGIN, "%s", string);
 }
+
+#ifdef CONFIG_USER_ONLY
+#include "qemu.h"
+const char *qemu_plugin_path_to_binary(void)
+{
+    TaskState *ts = (TaskState *) current_cpu->opaque;
+    return ts->bprm->filename;
+}
+
+uint64_t qemu_plugin_start_code(void)
+{
+    TaskState *ts = (TaskState *) current_cpu->opaque;
+    return ts->info->start_code;
+}
+
+uint64_t qemu_plugin_end_code(void)
+{
+    TaskState *ts = (TaskState *) current_cpu->opaque;
+    return ts->info->end_code;
+}
+
+uint64_t qemu_plugin_entry_code(void)
+{
+    TaskState *ts = (TaskState *) current_cpu->opaque;
+    return ts->info->entry;
+}
+#endif
diff --git a/plugins/qemu-plugins.symbols b/plugins/qemu-plugins.symbols
index 4bdb381f48..021851fb7d 100644
--- a/plugins/qemu-plugins.symbols
+++ b/plugins/qemu-plugins.symbols
@@ -37,4 +37,8 @@
   qemu_plugin_n_vcpus;
   qemu_plugin_n_max_vcpus;
   qemu_plugin_outs;
+  qemu_plugin_path_to_binary;
+  qemu_plugin_start_code;
+  qemu_plugin_end_code;
+  qemu_plugin_entry_code;
 };