target/cortex_m: cumulate DHCSR sticky bits

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

# Defines basic Tcl procs for OpenOCD target module

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

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...
        switch $MODE {
                halt -
                init {
                        set halt 1
                }
                run {
                        set halt 0
                }
                default {
                        return -code 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 $targets {
                if {![using_jtag] || [jtag tapisenabled [$t cget -chain-position]]} {
                        $t invoke-event examine-start
                        set err [catch "$t arp_examine allow-defer"]
                        if { $err } {
                                $t invoke-event examine-fail
                        } else {
                                $t invoke-event examine-end
                        }
                }
        }

        # 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 $targets {
                # C code needs to know if we expect to 'halt'
                if {![using_jtag] || [jtag tapisenabled [$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 $targets {
                # Again, de-assert code needs to know if we 'halt'
                if {![using_jtag] || [jtag tapisenabled [$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 $targets {
                        if {[using_jtag] && ![jtag tapisenabled [$t cget -chain-position]]} {
                                continue
                        }

                        # don't wait for targets where examination is deferred
                        # they can not be halted anyway at this point
                        if { ![$t was_examined] && [$t examine_deferred] } {
                                continue
                        }

                        # Wait up to 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 { $s != "halted" } {
                                return -code error [format "TARGET: %s - Not halted" $t]
                        }
                }
        }

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

                        # don't wait for targets where examination is deferred
                        # they can not be halted anyway at this point
                        if { ![$t was_examined] && [$t examine_deferred] } {
                                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
        }
}

proc using_jtag {} {
        set _TRANSPORT [ transport select ]
        expr { [ string first "jtag" $_TRANSPORT ] != -1 }
}

proc using_swd {} {
        set _TRANSPORT [ transport select ]
        expr { [ string first "swd" $_TRANSPORT ] != -1 }
}

proc using_hla {} {
        set _TRANSPORT [ transport select ]
        expr { [ string first "hla" $_TRANSPORT ] != -1 }
}

#########

# Target/chain configuration scripts can either execute commands directly
# or define a procedure which is executed once all configuration
# scripts have completed.
#
# By default(classic) the config scripts will set up the target configuration
proc init_targets {} {
}

proc set_default_target_event {t e s} {
        if {[$t cget -event $e] == ""} {
                $t configure -event $e $s
        }
}

proc init_target_events {} {
        set targets [target names]

        foreach t $targets {
                set_default_target_event $t gdb-flash-erase-start "reset init"
                set_default_target_event $t gdb-flash-write-end "reset halt"
                set_default_target_event $t gdb-attach "halt 1000"
        }
}

# Additionally board config scripts can define a procedure init_board that will be executed after init and init_targets
proc init_board {} {
}

# smp_on/smp_off were already DEPRECATED in v0.11.0 through http://openocd.zylin.com/4615
lappend _telnet_autocomplete_skip "aarch64 smp_on"
proc "aarch64 smp_on" {args} {
        echo "DEPRECATED! use 'aarch64 smp on' not 'aarch64 smp_on'"
        eval aarch64 smp on $args
}

lappend _telnet_autocomplete_skip "aarch64 smp_off"
proc "aarch64 smp_off" {args} {
        echo "DEPRECATED! use 'aarch64 smp off' not 'aarch64 smp_off'"
        eval aarch64 smp off $args
}

lappend _telnet_autocomplete_skip "cortex_a smp_on"
proc "cortex_a smp_on" {args} {
        echo "DEPRECATED! use 'cortex_a smp on' not 'cortex_a smp_on'"
        eval cortex_a smp on $args
}

lappend _telnet_autocomplete_skip "cortex_a smp_off"
proc "cortex_a smp_off" {args} {
        echo "DEPRECATED! use 'cortex_a smp off' not 'cortex_a smp_off'"
        eval cortex_a smp off $args
}

lappend _telnet_autocomplete_skip "mips_m4k smp_on"
proc "mips_m4k smp_on" {args} {
        echo "DEPRECATED! use 'mips_m4k smp on' not 'mips_m4k smp_on'"
        eval mips_m4k smp on $args
}

lappend _telnet_autocomplete_skip "mips_m4k smp_off"
proc "mips_m4k smp_off" {args} {
        echo "DEPRECATED! use 'mips_m4k smp off' not 'mips_m4k smp_off'"
        eval mips_m4k smp off $args
}