* lib/gdb.exp (gdb_run_cmd, gdb_start_cmd, run_to_main): Add comments.
(gdb_step_for_stub): Add comments.
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@ -1,3 +1,8 @@
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2011-12-03 Doug Evans <dje@google.com>
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* lib/gdb.exp (gdb_run_cmd, gdb_start_cmd, run_to_main): Add comments.
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(gdb_step_for_stub): Add comments.
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2011-12-02 Maciej W. Rozycki <macro@codesourcery.com>
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* lib/gdb.exp (gdb_expect): Pass all the exception conditions up
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@ -187,14 +187,15 @@ proc delete_breakpoints {} {
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}
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}
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#
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# Generic run command.
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#
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# The second pattern below matches up to the first newline *only*.
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# Using ``.*$'' could swallow up output that we attempt to match
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# elsewhere.
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#
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# N.B. This function does not wait for gdb to return to the prompt,
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# that is the caller's responsibility.
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proc gdb_run_cmd {args} {
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global gdb_prompt
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@ -300,6 +301,9 @@ proc gdb_run_cmd {args} {
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# Generic start command. Return 0 if we could start the program, -1
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# if we could not.
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#
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# N.B. This function does not wait for gdb to return to the prompt,
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# that is the caller's responsibility.
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proc gdb_start_cmd {args} {
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global gdb_prompt
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@ -451,12 +455,14 @@ proc runto { function args } {
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return 1
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}
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# Ask gdb to run until we hit a breakpoint at main.
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# The case where the target uses stubs has to be handled
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# specially--if it uses stubs, assuming we hit
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# breakpoint() and just step out of the function.
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#
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# runto_main -- ask gdb to run until we hit a breakpoint at main.
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# The case where the target uses stubs has to be handled
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# specially--if it uses stubs, assuming we hit
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# breakpoint() and just step out of the function.
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#
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# N.B. This function deletes all existing breakpoints.
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# If you don't want that, use gdb_start_cmd.
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proc runto_main { } {
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global gdb_prompt
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global decimal
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@ -472,7 +478,6 @@ proc runto_main { } {
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return 1
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}
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### Continue, and expect to hit a breakpoint.
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### Report a pass or fail, depending on whether it seems to have
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### worked. Use NAME as part of the test name; each call to
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@ -3142,6 +3147,32 @@ proc setup_kfail_for_target { PR target } {
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}
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}
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# Test programs for embedded (often "bare board") systems sometimes use a
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# "stub" either embedded in the test program itself or in the boot rom.
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# The job of the stub is to implement the remote protocol to communicate
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# with gdb and control the inferior. To initiate the remote protocol
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# session with gdb the stub needs to be given control by the inferior.
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# They do this by calling a function that typically triggers a trap
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# from main that transfers control to the stub.
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# The purpose of this function, gdb_step_for_stub, is to step out of
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# that function ("breakpoint" in the example below) and back into main.
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#
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# Example:
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#
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# int
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# main ()
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# {
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# #ifdef usestubs
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# set_debug_traps (); /* install trap handlers for stub */
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# breakpoint (); /* trigger a trap to give the stub control */
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# #endif
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# /* test program begins here */
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# }
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#
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# Note that one consequence of this design is that a breakpoint on "main"
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# does not Just Work (because if the target could stop there you still have
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# to step past the calls to set_debug_traps,breakpoint).
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proc gdb_step_for_stub { } {
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global gdb_prompt;
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