[PATCH 3/9 v7] Introduce target_{stop,continue}_ptid

[Gary Benson <gbenson@redhat.com>]

This commit introduces two new functions to stop and restart target
processes that shared code can use and that clients must implement.
It also changes some shared code to use these functions.

The changes in this patch replace the target_stop, target_wait
and target_resume parts of this patch I posted on August 1:
https://sourceware.org/ml/gdb-patches/2014-08/msg00014.html
The remainder of that patch is in patch 2 of this series.

gdb/ChangeLog:

	* target/target.h (target_stop_ptid, target_continue_ptid):
	Declare.
	* target.c (target_stop_ptid, target_continue_ptid): New
	functions.
	* common/agent.c [!GDBSERVER]: Don't include infrun.h.
	(agent_run_command): Always use target_stop_ptid and
	target_continue_ptid.

gdb/gdbserver/ChangeLog:

	* target.c (target_stop_ptid, target_continue_ptid): New
	functions.
---
 gdb/ChangeLog           |   10 ++++++++++
 gdb/common/agent.c      |   37 ++-----------------------------------
 gdb/gdbserver/ChangeLog |    5 +++++
 gdb/gdbserver/target.c  |   32 ++++++++++++++++++++++++++++++++
 gdb/target.c            |   25 +++++++++++++++++++++++++
 gdb/target/target.h     |   12 ++++++++++++
 6 files changed, 86 insertions(+), 35 deletions(-)

diff --git a/gdb/common/agent.c b/gdb/common/agent.c
index 9f8ea9a..0ac73a9 100644
--- a/gdb/common/agent.c
+++ b/gdb/common/agent.c
@@ -21,7 +21,6 @@
 #include "server.h"
 #else
 #include "defs.h"
-#include "infrun.h"
 #include "objfiles.h"
 #endif
 #include "target/target.h"
@@ -218,18 +217,7 @@ agent_run_command (int pid, const char *cmd, int len)
   DEBUG_AGENT ("agent: resumed helper thread\n");
 
   /* Resume helper thread.  */
-#ifdef GDBSERVER
-{
-  struct thread_resume resume_info;
-
-  resume_info.thread = ptid;
-  resume_info.kind = resume_continue;
-  resume_info.sig = GDB_SIGNAL_0;
-  (*the_target->resume) (&resume_info, 1);
-}
-#else
- target_resume (ptid, 0, GDB_SIGNAL_0);
-#endif
+  target_continue_ptid (ptid);
 
   fd = gdb_connect_sync_socket (pid);
   if (fd >= 0)
@@ -261,30 +249,9 @@ agent_run_command (int pid, const char *cmd, int len)
   /* Need to read response with the inferior stopped.  */
   if (!ptid_equal (ptid, null_ptid))
     {
-      struct target_waitstatus status;
-      int was_non_stop = non_stop;
       /* Stop thread PTID.  */
       DEBUG_AGENT ("agent: stop helper thread\n");
-#ifdef GDBSERVER
-      {
-	struct thread_resume resume_info;
-
-	resume_info.thread = ptid;
-	resume_info.kind = resume_stop;
-	resume_info.sig = GDB_SIGNAL_0;
-	(*the_target->resume) (&resume_info, 1);
-      }
-
-      non_stop = 1;
-      mywait (ptid, &status, 0, 0);
-#else
-      non_stop = 1;
-      target_stop (ptid);
-
-      memset (&status, 0, sizeof (status));
-      target_wait (ptid, &status, 0);
-#endif
-      non_stop = was_non_stop;
+      target_stop_ptid (ptid);
     }
 
   if (fd >= 0)
diff --git a/gdb/gdbserver/target.c b/gdb/gdbserver/target.c
index 08506e5..e51b7db 100644
--- a/gdb/gdbserver/target.c
+++ b/gdb/gdbserver/target.c
@@ -134,6 +134,38 @@ mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
   return ret;
 }
 
+/* See target/target.h.  */
+
+void
+target_stop_ptid (ptid_t ptid)
+{
+  struct target_waitstatus status;
+  int was_non_stop = non_stop;
+  struct thread_resume resume_info;
+
+  resume_info.thread = ptid;
+  resume_info.kind = resume_stop;
+  resume_info.sig = GDB_SIGNAL_0;
+  (*the_target->resume) (&resume_info, 1);
+
+  non_stop = 1;
+  mywait (ptid, &status, 0, 0);
+  non_stop = was_non_stop;
+}
+
+/* See target/target.h.  */
+
+void
+target_continue_ptid (ptid_t ptid)
+{
+  struct thread_resume resume_info;
+
+  resume_info.thread = ptid;
+  resume_info.kind = resume_continue;
+  resume_info.sig = GDB_SIGNAL_0;
+  (*the_target->resume) (&resume_info, 1);
+}
+
 int
 start_non_stop (int nonstop)
 {
diff --git a/gdb/target.c b/gdb/target.c
index 711e7cb..339b1d1 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -3027,6 +3027,31 @@ target_stop (ptid_t ptid)
   (*current_target.to_stop) (&current_target, ptid);
 }
 
+/* See target/target.h.  */
+
+void
+target_stop_ptid (ptid_t ptid)
+{
+  struct target_waitstatus status;
+  int was_non_stop = non_stop;
+
+  non_stop = 1;
+  target_stop (ptid);
+
+  memset (&status, 0, sizeof (status));
+  target_wait (ptid, &status, 0);
+
+  non_stop = was_non_stop;
+}
+
+/* See target/target.h.  */
+
+void
+target_continue_ptid (ptid_t ptid)
+{
+  target_resume (ptid, 0, GDB_SIGNAL_0);
+}
+
 /* Concatenate ELEM to LIST, a comma separate list, and return the
    result.  The LIST incoming argument is released.  */
 
diff --git a/gdb/target/target.h b/gdb/target/target.h
index 0a3c4b7..902de64 100644
--- a/gdb/target/target.h
+++ b/gdb/target/target.h
@@ -59,4 +59,16 @@ extern int target_read_uint32 (CORE_ADDR memaddr, uint32_t *result);
 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
 				ssize_t len);
 
+/* Make target stop in a continuable fashion.  (For instance, under
+   Unix, this should act like SIGSTOP).  This function must be
+   provided by the client.  This function is normally used by GUIs
+   to implement a stop button.  */
+
+extern void target_stop_ptid (ptid_t ptid);
+
+/* Restart a target that was previously stopped by target_stop_ptid.
+   This function must be provided by the client.  */
+
+extern void target_continue_ptid (ptid_t ptid);
+
 #endif /* TARGET_COMMON_H */
-- 
1.7.1