docs: add reference to git bisect docs on BUGS page

[openocd.git] / src / helper / startup.tcl

#
# Defines basic Tcl procs that must be there for
# OpenOCD to work.
#
# Embedded into OpenOCD executable
#


# Help text list. A list of command + help text pairs.
#
# Commands can be more than one word and they are stored
# as "flash banks" "help text x x x"

proc add_help_text {cmd cmd_help} {
        global ocd_helptext
        lappend ocd_helptext [list $cmd $cmd_help]
}

proc get_help_text {} {
        global ocd_helptext
        return $ocd_helptext
}


# Show flash in human readable form
# This is an example of a human readable form of a low level fn
proc flash_banks {} {
        set i 0
        set result ""
        foreach {a} [ocd_flash_banks] {
                if {$i > 0} {
                        set result "$result\n"
                }
                set result [format "$result#%d: %s at 0x%08x, size 0x%08x, buswidth %d, chipwidth %d" $i $a(name) $a(base) $a(size) $a(bus_width) $a(chip_width)]
                set i [expr $i+1]
        }
        return $result
}

# We need to explicitly redirect this to the OpenOCD command
# as Tcl defines the exit proc
proc exit {} {
        ocd_throw exit
}

#Print help text for a command. Word wrap
#help text that is too wide inside column.
proc help {args} {
        global ocd_helptext
        set cmd $args
        foreach a [lsort $ocd_helptext] {
                if {[string length $cmd]==0||[string first $cmd $a]!=-1||[string first $cmd [lindex $a 1]]!=-1} {
                        set w 50
                        set cmdname [lindex $a 0]
                        set h [lindex $a 1]
                        set n 0
                        while 1 {
                                if {$n > [string length $h]} {break}

                                set next_a [expr $n+$w]
                                if {[string length $h]>$n+$w} {
                                        set xxxx [string range $h $n [expr $n+$w]]
                                        for {set lastpos [expr [string length $xxxx]-1]} {$lastpos>=0&&[string compare [string range $xxxx $lastpos $lastpos] " "]!=0} {set lastpos [expr $lastpos-1]} {
                                        }
                                        #set next_a -1
                                        if {$lastpos!=-1} {
                                                set next_a [expr $lastpos+$n+1]
                                        }
                                }


                                puts [format "%-25s %s" $cmdname [string range $h $n [expr $next_a-1]] ]
                                set cmdname ""
                                set n [expr $next_a]
                        }
                }
        }
}

add_help_text help "Tcl implementation of help command"


# If a fn is unknown to Tcl, we try to execute it as an OpenOCD command
#
# We also support two level commands. "flash banks" is translated to
# flash_banks
proc unknown {args} {
        # do the name mangling from "flash banks" to "flash_banks"
        if {[llength $args]>=2} {
                set cmd_name "[lindex $args 0]_[lindex $args 1]"
                if {[catch {info body $cmd_name}]==0} {
                    # the command exists, try it...
                        return [eval "$cmd_name [lrange $args 2 end]"]
                }
        }
        # This really is an unknown command.
        return -code error "Unknown command: $args"
}

proc new_target_name { } {
        return [target number [expr [target count] - 1 ]]
}

# Try flipping / and \ to find file if the filename does not
# match the precise spelling
proc find {filename} {
        if {[catch {ocd_find $filename} t]==0} {
                return $t
        }
        if {[catch {ocd_find [string map {\ /} $filename} t]==0} {
                return $t
        }
        if {[catch {ocd_find [string map {/ \\} $filename} t]==0} {
                return $t
        }
        # make sure error message matches original input string
        return -code error "Can't find $filename"
}
add_help_text find "<file> - print full path to file according to OpenOCD search rules"

# Run script
proc script {filename} {
        source [find $filename]
}

add_help_text script "<filename> - filename of OpenOCD script (tcl) to run"

# Handle GDB 'R' packet. Can be overriden by configuration script,
# but it's not something one would expect target scripts to do
# normally
proc ocd_gdb_restart {target_id} {
        # Fix!!! we're resetting all targets here! Really we should reset only
        # one target
        reset halt
}


# This reset logic may be overridden by board/target/... scripts as needed
# to provide a reset that, if possible, is close to a power-up reset.
#
# Exit requirements include:  (a) JTAG must be working, (b) the scan
# chain was validated with "jtag arp_init" (or equivalent), (c) nothing
# stays in reset.  No TAP-specific scans were performed.  It's OK if
# some targets haven't been reset yet; they may need TAP-specific scans.
#
# The "mode" values include:  halt, init, run (from "reset" command);
# startup (at OpenOCD server startup, when JTAG may not yet work); and
# potentially more (for reset types like cold, warm, etc)
proc init_reset { mode } {
        jtag arp_init-reset
}


global in_process_reset
set in_process_reset 0

# Catch reset recursion
proc ocd_process_reset { MODE } {
        global in_process_reset
        if {$in_process_reset} {
                set in_process_reset 0
                return -code error "'reset' can not be invoked recursively"
        }

        set in_process_reset 1
        set success [expr [catch {ocd_process_reset_inner $MODE} result]==0]
        set in_process_reset 0

        if {$success} {
                return $result
        } else {
                return -code error $result
        }
}

proc ocd_process_reset_inner { MODE } {
        set targets [target names]

        # If this target must be halted...
        set halt -1
        if { 0 == [string compare $MODE halt] } {
                set halt 1
        }
        if { 0 == [string compare $MODE init] } {
                set halt 1;
        }
        if { 0 == [string compare $MODE run ] } {
                set halt 0;
        }
        if { $halt < 0 } {
                return -error "Invalid mode: $MODE, must be one of: halt, init, or run";
        }

        # Target event handlers *might* change which TAPs are enabled
        # or disabled, so we fire all of them.  But don't issue any
        # target "arp_*" commands, which may issue JTAG transactions,
        # unless we know the underlying TAP is active.
        #
        # NOTE:  ARP == "Advanced Reset Process" ... "advanced" is
        # relative to a previous restrictive scheme

        foreach t $targets {
                # New event script.
                $t invoke-event reset-start
        }

        # Use TRST or TMS/TCK operations to reset all the tap controllers.
        # TAP reset events get reported; they might enable some taps.
        init_reset $MODE

        # Examine all targets on enabled taps.
        foreach t $targets {
                if {[jtag tapisenabled [$t cget -chain-position]]} {
                        $t arp_examine
                }
        }

        # Assert SRST, and report the pre/post events.
        # Note:  no target sees SRST before "pre" or after "post".
        foreach t $targets {
                $t invoke-event reset-assert-pre
        }
        foreach t $targets {
                # C code needs to know if we expect to 'halt'
                if {[jtag tapisenabled [$t cget -chain-position]]} {
                        $t arp_reset assert $halt
                }
        }
        foreach t $targets {
                $t invoke-event reset-assert-post
        }

        # Now de-assert SRST, and report the pre/post events.
        # Note:  no target sees !SRST before "pre" or after "post".
        foreach t $targets {
                $t invoke-event reset-deassert-pre
        }
        foreach t $targets {
                # Again, de-assert code needs to know if we 'halt'
                if {[jtag tapisenabled [$t cget -chain-position]]} {
                        $t arp_reset deassert $halt
                }
        }
        foreach t $targets {
                $t invoke-event reset-deassert-post
        }

        # Pass 1 - Now wait for any halt (requested as part of reset
        # assert/deassert) to happen.  Ideally it takes effect without
        # first executing any instructions.
        if { $halt } {
                foreach t $targets {
                        if {[jtag tapisenabled [$t cget -chain-position]] == 0} {
                                continue
                        }

                        # Wait upto 1 second for target to halt.  Why 1sec? Cause
                        # the JTAG tap reset signal might be hooked to a slow
                        # resistor/capacitor circuit - and it might take a while
                        # to charge

                        # Catch, but ignore any errors.
                        catch { $t arp_waitstate halted 1000 }

                        # Did we succeed?
                        set s [$t curstate]

                        if { 0 != [string compare $s "halted" ] } {
                                return -error [format "TARGET: %s - Not halted" $t]
                        }
                }
        }

        #Pass 2 - if needed "init"
        if { 0 == [string compare init $MODE] } {
                foreach t $targets {
                        if {[jtag tapisenabled [$t cget -chain-position]] == 0} {
                                continue
                        }

                        set err [catch "$t arp_waitstate halted 5000"]
                        # Did it halt?
                        if { $err == 0 } {
                                $t invoke-event reset-init
                        }
                }
        }

        foreach t $targets {
                $t invoke-event reset-end
        }
}

#########

# REVISIT power_restore, power_dropout, srst_deasserted, srst_asserted
# are currently neither documented nor supported except on ZY1000.

proc power_restore {} {
        puts "Sensed power restore."
        reset init
}

add_help_text power_restore "Overridable procedure run when power restore is detected. Runs 'reset init' by default."

proc power_dropout {} {
        puts "Sensed power dropout."
}

proc srst_deasserted {} {
        puts "Sensed nSRST deasserted."
        reset init
}
add_help_text srst_deasserted "Overridable procedure run when srst deassert is detected. Runs 'reset init' by default."

proc srst_asserted {} {
        puts "Sensed nSRST asserted."
}

#########

# catch any exceptions, capture output and return output
proc capture_catch {a} {
        catch {
                capture {uplevel $a}
        } result
        return $result
}


# Executed during "init". Can be overridden
# by board/target/... scripts
proc jtag_init {} {
        if {[catch {jtag arp_init} err]!=0} {
                # try resetting additionally
                init_reset startup
        }
}