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Adds 'jtag init' command handler, which can be called as part of a
fine-grained 'init' process.

Split flash initialiation into 'flash init', called from 'init'.

Splits mflash initialiation to 'mflash init', called from 'init'.

Split NAND initialization into 'nand init', which gets called from
the main 'init' command.

Split PLD initialization into 'pld init', which gets called from 'init'.

Save and display the address of the instruction which triggered the
watchpoint.  Because of pipelining, that's well behind the PC value
when debug entry completes.  (Example in a subroutine that had been
returned from...)

Remove unused A8 stuff, mostly watchpoint hooks from the header.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

Except for USR/SYS mode, the labels for the shadowed SP and LR
registers were reversed.  LR is r14; SP is r13.  Fix.

This would not affect GDB users; GDB references are positional.
Only folk working directly with OpenOCD register values would
have noticed this bug.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

keep up with server_init() introduction.
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

Actually this should handle both breakpoints and watchpoints ... but
the DPM framework only handles watchpoints for now.  Works on Beagle.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

This is a NOP unless the underlying core exposes two new methods, and
neither of the two cores using this (ARM11xx, Cortex-A8) do so yet.

This patch only updates those cores so they pass a flag saying whether
or not to update breakpoint and watchpoint status before resuming; and
removing some now-needless anti-segfault code from ARM11.  Cortex-A8
didn't have that code ... yes, it segfaulted when setting watchpoints.

NOTE:  this uses a slightly different strategy for setting/clearing
breakpoints than the ARM7/ARM9/etc code uses.  It leaves them alone
unless it's *got* to change something, to speed halt/resume cycles
(including single stepping).

ALSO NOTE:  this under-delivers for Cortex-A8, where regions with size
up to 2 GBytes can be watched ... it handles watchpoints which ARM11 can
also handle (size 1/2/4 bytes).  Should get fixed later.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

These are architecturally defined, not core-specific.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

Make them match the C code.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

Also updated to use target name when creating flash
and set jtag_khz to 16000.
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

Keep up with Jim Tcl interpreter creation cleanup.
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

In embedded hosts, the Jim interpreter can come from the
existing context rather than be created by OpenOCD.
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

We don't need this code, now that the DPM code handles it.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

We don't need this code, now that the DPM code handles it.
Neither do we need the ARMv7-A CP15 operations; remove their
remnants too.  And disable a mostly-needless diagnostic.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

Instead of having separate ARM11 and Cortex-A8 implementations of
this code, have one shared implementation which just builds on the
existing "run instruction via R0" support.

This enables followup patches to remove that now-unused code from
those two drivers.  (Patches to move the "mrc" and "mcr" code into
"struct arm" are due too ... MIPS and other cores do not support
those ARM-specific concepts.)
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

Switch "mrc" and "mcr" commands to be toplevel ARM operations,
as they should initially have been.

Correct the usage message for both commands:  it matches ARM
documentation (as one wants!) instead of reordering them to
match the funky mrc() and mcr() method usage (sigh).

For Cortex-A8: restore a line that got accidentally dropped,
so the secure monitor mode shadow registers will show again.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

The ARMv7-A code uses read_cp15() to access fault registers.
Instead, use DPM operations directly, passing in the relevant
MRC instructions.

This eliminates per-operation overhead (though it'll be hard
to observe, this is uncommon) and helps eliminate read_cp15().
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

There were two chunks of Cortex-A8 code which called the
ARMv7-A CP15 operations; get rid of them, helping prepare
to remove those methods completely:

 - post_debug_entry() can use the mrc() method to read
   its two registers.

 - write_memory() can use dpm->instr_write_data_r0() to
   flush the ICache and DCache ... doing it this way is
   actually faster since it reduces per-write overhead.

Note that the mrc() method parameters are re-ordered with
respect to the ARM instruction documentation, so that part
can be confusing.

Cleaned up the layout and comments in those areas a bit.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

There is no particular reason to invoke jtag_interface_quit()
on the atexit() handler, it just makes the code more obtuse
and stops other legitimate usage of atexit().
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

Ensures that the correct information gets displayed, depending on the
mode of the command being denied.  Fixes misreporting all commands as
needing to run "before 'init'".

Clean up two aspects to this routine:  bad naming, since it
doesn't restore the context, just the banked registers; and
excess indentation for the bulk of the code.

Also make some of its call sites stash the function's return
code; someday they should use it for error checking.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

This "loop over all registers" routine shared the same mess as
full_context() in terms of dozens of needless number_to_mode()
calls.  Fix that, and comments, with related cleanup.

The misnamed xscale_restore_context() had a related bug.  It
was restoring the *WRONG REGISTERS* ... always from whatever
the current mode was, instead of using the copy from whichever
register bank it was trying to restore.  (But it marked the
intended register as having been restored...)  Fixed that.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

Finish removing references to the 'interp' global variable from the
command module, encapsulating all reference via command_context.

Eliminates use of the global entirely, so it can be removed.  Hurrah!

Adds a log_capture_state structure to pass to the log capture
callback used by the command module.  Ensures that the capture occurs
in the proper context.

Adds 'interp' field to command_context, chasing the few remaining
references to the global variable outside of the command module.

Adds 'interp' to target_event_action structure to avoid using the
global variable of the same name.

Adds 'interp' field to jtag_tap_event_action structure to avoid
using the global variable of same name.

Splits the old help strings to provide proper usage as well.

The 'help' text will become more verbose, so its entire text will be
far more than desired when you only borked your syntax.  The usage
still allows the commands to be looked up for more help.

Somehow, the comment block for command handlers ended up associated
with the output_handler.  Move it to the command_handler_t declaration.

command_done() does not need to return an error, but it needed
Doxygen comment.  Provide some for copy_command_context as well.

Note: this audit revealed some potential bugs with the command context
implementation.  There was a reason that commands were added at the
end of the list.  Shallow copying of command_context means that
the list is shared between them.  And commands added at the top-level
before the pre-existing commands will not be available in the shared
context as they were before.  Yikes!

Fortunately, this does not seem to occur in general use, as
'add_help_text' gets registered in startup.tcl and claims the first slot
in my own test cases.  Thus, it seems that we have been masking the issue
for now, but it shows the need for further architectural improvement in
the core command module.

With the ability to defer 'init', users can access the help system while
still in CONFIG mode.  This patch omits commands from the help and usage
list when they cannot be run in the current command mode, making it much
easier to see what can be done at a given time.

Adds 'noinit' command to prevent OpenOCD from running 'init' at the end
up startup, allowing it to be given from telnet or TCL.  This provides
the old behavior by default, and users can add this command to their
scripts to get the new behavior.

Moves the telnet and TCL server startup to server_init(), moving their
respective command registration in to server_register_commands().
Adds proper error checking for these particular startup processes.

Moves the core server startup to openocd_main(), improving related error
checking and preparing to defer 'init'.

Rework gdb_init to create flexible APIs (gdb_target_add_{one,all}) and
static helper (gdb_target_start) for starting GDB services.  Eliminates
duplicated code and provides general mechanisms for adding GDB services.
The 'init' command is updated to call the new API, and later patches can
decouple its policy of adding all targets therein.

Provides the new capability to use both piped and TCP servers when
multiple targets are defined.  The first target fills the pipe, and
others will be started on TCP ports (unless disabled, i.e. gdb_port=0).

Add missing COMMAND_REGISTRATION_DONE.

For now the command syntax for zy1000 needs to be compatible
across 0.3/0.4, the world outside OpenOCD interfaces to
zy1000 using the old syntax. Post 0.4 release(0.4.1 even)
I'll switch to subcommand scheme.

Switch to subcommands post 0.3 lifecycle.
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

Streamline the loop by continuing as soon as we know there's no
work to be done; this lets us un-indent almost everything.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>