2011-12-14 Pedro Alves <pedro@codesourcery.com>

	* gdb.texinfo (Implementing a Remote Stub): Explain that you
	should transfer control to the stub in the startup code instead of
	in main.  Mention the need to get past the initial breakpoint.

diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog
index b295a48857e673f13313259758de674a68d70627..6cd0b9be9fb04419b31005ba116c0057fe3d3873 100644 (file)
--- a/gdb/doc/ChangeLog
+++ b/gdb/doc/ChangeLog
@@ -1,3 +1,9 @@
+2011-12-14  Pedro Alves  <pedro@codesourcery.com>
+
+       * gdb.texinfo (Implementing a Remote Stub): Explain that you
+       should transfer control to the stub in the startup code instead of
+       in main.  Mention the need to get past the initial breakpoint.
+
 2011-12-06  Tom Tromey  <tromey@redhat.com>
 
        * gdb.texinfo (Set Breaks): Update for new behavior.

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 50c299e480d0723b81d97cc888500117829576f7..925e66adca0d49b409fe90eb57b0c5b034b2ee5c 100644 (file)
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -17536,8 +17536,8 @@ subroutines:
 @findex set_debug_traps
 @cindex remote serial stub, initialization
 This routine arranges for @code{handle_exception} to run when your
-program stops.  You must call this subroutine explicitly near the
-beginning of your program.
+program stops.  You must call this subroutine explicitly in your
+program's startup code.
 
 @item handle_exception
 @findex handle_exception
@@ -17683,13 +17683,22 @@ Make sure you have defined the supporting low-level routines
 @end display
 
 @item
-Insert these lines near the top of your program:
+Insert these lines in your program's startup code, before the main
+procedure is called:
 
 @smallexample
 set_debug_traps();
 breakpoint();
 @end smallexample
 
+On some machines, when a breakpoint trap is raised, the hardware
+automatically makes the PC point to the instruction after the
+breakpoint.  If your machine doesn't do that, you may need to adjust
+@code{handle_exception} to arrange for it to return to the instruction
+after the breakpoint on this first invocation, so that your program
+doesn't keep hitting the initial breakpoint instead of making
+progress.
+
 @item
 For the 680x0 stub only, you need to provide a variable called
 @code{exceptionHook}.  Normally you just use: