[PATCH 1/2] [gdbserver] Rename supports_conditional_breakpoints to supports_hardware_single_step

[Yao Qi <qiyaoltc@gmail.com>]

In my patch https://sourceware.org/ml/gdb-patches/2015-04/msg01110.html
a new target_ops hook supports_conditional_breakpoints was added to
disable conditional breakpoints if target doesn't have hardware single
step.  This patch is to generalize this hook from
supports_conditional_breakpoints to supports_hardware_single_step,
so that the following patch can use it.

gdb/gdbserver:

2015-09-01  Yao Qi  <yao.qi@linaro.org>

	* linux-low.c (linux_supports_conditional_breakpoints): Rename
	it to ...
	(linux_supports_hardware_single_step): ... New function.
	(linux_target_ops): Update.
	* lynx-low.c (lynx_target_ops): Set field
	supports_hardware_single_step to target_can_do_hardware_single_step.
	* nto-low.c (nto_target_ops): Likewise.
	* spu-low.c (spu_target_ops): Likewise.
	* win32-low.c (win32_target_ops): Likewise.
	* target.c (target_can_do_hardware_single_step): New function.
	* target.h (struct target_ops) <supports_conditional_breakpoints>:
	Remove.  <supports_hardware_single_step>: New field.
	(target_supports_conditional_breakpoints): Remove.
	(target_supports_hardware_single_step): New macro.
	(target_can_do_hardware_single_step): Declare.
	* server.c (handle_query): Use target_supports_hardware_single_step
	instead of target_supports_conditional_breakpoints.
---
 gdb/gdbserver/linux-low.c | 11 +++--------
 gdb/gdbserver/lynx-low.c  |  5 +----
 gdb/gdbserver/nto-low.c   |  5 +----
 gdb/gdbserver/server.c    | 12 +++++++++---
 gdb/gdbserver/spu-low.c   |  2 +-
 gdb/gdbserver/target.c    |  8 ++++++++
 gdb/gdbserver/target.h    | 13 +++++++------
 gdb/gdbserver/win32-low.c |  5 +----
 8 files changed, 31 insertions(+), 30 deletions(-)

diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index f4c6029..9ae0522 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -5524,16 +5524,11 @@ linux_supports_stopped_by_hw_breakpoint (void)
   return USE_SIGTRAP_SIGINFO;
 }
 
-/* Implement the supports_conditional_breakpoints target_ops
-   method.  */
+/* Implement the supports_hardware_single_step target_ops method.  */
 
 static int
-linux_supports_conditional_breakpoints (void)
+linux_supports_hardware_single_step (void)
 {
-  /* GDBserver needs to step over the breakpoint if the condition is
-     false.  GDBserver software single step is too simple, so disable
-     conditional breakpoints if the target doesn't have hardware single
-     step.  */
   return can_hardware_single_step ();
 }
 
@@ -6886,7 +6881,7 @@ static struct target_ops linux_target_ops = {
   linux_supports_stopped_by_sw_breakpoint,
   linux_stopped_by_hw_breakpoint,
   linux_supports_stopped_by_hw_breakpoint,
-  linux_supports_conditional_breakpoints,
+  linux_supports_hardware_single_step,
   linux_stopped_by_watchpoint,
   linux_stopped_data_address,
 #if defined(__UCLIBC__) && defined(HAS_NOMMU)	      \
diff --git a/gdb/gdbserver/lynx-low.c b/gdb/gdbserver/lynx-low.c
index 1a187c8..c5eb8fd 100644
--- a/gdb/gdbserver/lynx-low.c
+++ b/gdb/gdbserver/lynx-low.c
@@ -747,10 +747,7 @@ static struct target_ops lynx_target_ops = {
   NULL,  /* supports_stopped_by_sw_breakpoint */
   NULL,  /* stopped_by_hw_breakpoint */
   NULL,  /* supports_stopped_by_hw_breakpoint */
-  /* Although lynx has hardware single step, still disable this
-     feature for lynx, because it is implemented in linux-low.c instead
-     of in generic code.  */
-  NULL,  /* supports_conditional_breakpoints */
+  target_can_do_hardware_single_step,
   NULL,  /* stopped_by_watchpoint */
   NULL,  /* stopped_data_address */
   NULL,  /* read_offsets */
diff --git a/gdb/gdbserver/nto-low.c b/gdb/gdbserver/nto-low.c
index 19f492f..fa216a9 100644
--- a/gdb/gdbserver/nto-low.c
+++ b/gdb/gdbserver/nto-low.c
@@ -950,10 +950,7 @@ static struct target_ops nto_target_ops = {
   NULL, /* supports_stopped_by_sw_breakpoint */
   NULL, /* stopped_by_hw_breakpoint */
   NULL, /* supports_stopped_by_hw_breakpoint */
-  /* Although nto has hardware single step, still disable this
-     feature for not, because it is implemented in linux-low.c instead
-     of in generic code.  */
-  NULL, /* supports_conditional_breakpoints */
+  target_can_do_hardware_single_step,
   nto_stopped_by_watchpoint,
   nto_stopped_data_address,
   NULL, /* nto_read_offsets */
diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c
index c52cf16..5c0d83d 100644
--- a/gdb/gdbserver/server.c
+++ b/gdb/gdbserver/server.c
@@ -2192,9 +2192,15 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
 	  strcat (own_buf, ";tracenz+");
 	}
 
-      /* Support target-side breakpoint conditions and commands.  */
-      if (target_supports_conditional_breakpoints ())
-	strcat (own_buf, ";ConditionalBreakpoints+");
+      if (target_supports_hardware_single_step ())
+	{
+	  /* Support target-side breakpoint conditions and commands.
+	     GDBserver needs to step over the breakpoint if the condition
+	     is false.  GDBserver software single step is too simple, so
+	     disable conditional breakpoints if the target doesn't have
+	     hardware single step.  */
+	  strcat (own_buf, ";ConditionalBreakpoints+");
+	}
       strcat (own_buf, ";BreakpointCommands+");
 
       if (target_supports_agent ())
diff --git a/gdb/gdbserver/spu-low.c b/gdb/gdbserver/spu-low.c
index 878ed82..074417a 100644
--- a/gdb/gdbserver/spu-low.c
+++ b/gdb/gdbserver/spu-low.c
@@ -666,7 +666,7 @@ static struct target_ops spu_target_ops = {
   NULL, /* supports_stopped_by_sw_breakpoint */
   NULL, /* stopped_by_hw_breakpoint */
   NULL, /* supports_stopped_by_hw_breakpoint */
-  NULL, /* supports_conditional_breakpoints */
+  NULL, /* supports_hardware_single_step */
   NULL,
   NULL,
   NULL,
diff --git a/gdb/gdbserver/target.c b/gdb/gdbserver/target.c
index 7540f2f..17ff7a6 100644
--- a/gdb/gdbserver/target.c
+++ b/gdb/gdbserver/target.c
@@ -216,3 +216,11 @@ kill_inferior (int pid)
 
   return (*the_target->kill) (pid);
 }
+
+/* Target can do hardware single step.  */
+
+int
+target_can_do_hardware_single_step (void)
+{
+  return 1;
+}
diff --git a/gdb/gdbserver/target.h b/gdb/gdbserver/target.h
index 3e3b80f..7df8df3 100644
--- a/gdb/gdbserver/target.h
+++ b/gdb/gdbserver/target.h
@@ -225,9 +225,8 @@ struct target_ops
      HW breakpoint triggering.  */
   int (*supports_stopped_by_hw_breakpoint) (void);
 
-  /* Returns true if the target can evaluate conditions of
-     breakpoints.  */
-  int (*supports_conditional_breakpoints) (void);
+  /* Returns true if the target can do hardware single step.  */
+  int (*supports_hardware_single_step) (void);
 
   /* Returns 1 if target was stopped due to a watchpoint hit, 0 otherwise.  */
 
@@ -609,9 +608,9 @@ int kill_inferior (int);
   (the_target->supports_stopped_by_hw_breakpoint ? \
    (*the_target->supports_stopped_by_hw_breakpoint) () : 0)
 
-#define target_supports_conditional_breakpoints() \
-  (the_target->supports_conditional_breakpoints ? \
-   (*the_target->supports_conditional_breakpoints) () : 0)
+#define target_supports_hardware_single_step() \
+  (the_target->supports_hardware_single_step ? \
+   (*the_target->supports_hardware_single_step) () : 0)
 
 #define target_stopped_by_hw_breakpoint() \
   (the_target->stopped_by_hw_breakpoint ? \
@@ -649,4 +648,6 @@ int set_desired_thread (int id);
 
 const char *target_pid_to_str (ptid_t);
 
+int target_can_do_hardware_single_step (void);
+
 #endif /* TARGET_H */
diff --git a/gdb/gdbserver/win32-low.c b/gdb/gdbserver/win32-low.c
index 86386ce..212c3c2 100644
--- a/gdb/gdbserver/win32-low.c
+++ b/gdb/gdbserver/win32-low.c
@@ -1810,10 +1810,7 @@ static struct target_ops win32_target_ops = {
   NULL, /* supports_stopped_by_sw_breakpoint */
   NULL, /* stopped_by_hw_breakpoint */
   NULL, /* supports_stopped_by_hw_breakpoint */
-  /* Although win32-i386 has hardware single step, still disable this
-     feature for win32, because it is implemented in linux-low.c instead
-     of in generic code.  */
-  NULL, /* supports_conditional_breakpoints */
+  target_can_do_hardware_single_step,
   win32_stopped_by_watchpoint,
   win32_stopped_data_address,
   NULL, /* read_offsets */
-- 
1.9.1