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;******************************************************************************

;

; The reset handler, which gets called when the processor starts.

;

;******************************************************************************

    export  Reset_Handler

Reset_Handler

    ;

    ; Initialize the processor.

    ;

    bl      ProcessorInit

    ;

    ; Branch to the SRAM copy of the reset handler.

    ;

    ldr     pc, =Reset_Handler_In_SRAM

;******************************************************************************

;

; Initialize the processor by copying the boot loader from flash to SRAM, zero

; filling the .bss section, and moving the vector table to the beginning of

; SRAM.  The return address is modified to point to the SRAM copy of the boot

; loader instead of the flash copy, resulting in a branch to the copy now in

; SRAM.

;

;******************************************************************************

    export  ProcessorInit

ProcessorInit

    ;

    ; Copy the code image from flash to SRAM.

    ;

    if      :def:_FLASH_PATCH_COMPATIBLE

    movs    r0, #0x1000

    else

    movs    r0, #0x0000

    endif

    movs    r1, #0x0000

    movt    r1, #0x2000

    import  ||Image$$SRAM$$ZI$$Base||

    ldr     r2, =||Image$$SRAM$$ZI$$Base||

copy_loop

        ldr     r3, [r0], #4

        str     r3, [r1], #4

        cmp     r1, r2

        blt     copy_loop

    ;

    ; Zero fill the .bss section.

    ;

    movs    r0, #0x0000

    import  ||Image$$SRAM$$ZI$$Limit||

    ldr     r2, =||Image$$SRAM$$ZI$$Limit||

zero_loop

        str     r0, [r1], #4

        cmp     r1, r2

        blt     zero_loop

    ;

    ; Set the vector table pointer to the beginning of SRAM.

    ;

    movw    r0, #(NVIC_VTABLE & 0xffff)

    movt    r0, #(NVIC_VTABLE >> 16)

    movs    r1, #0x0000

    movt    r1, #0x2000

    str     r1, [r0]

    ;

    ; Return to the caller.

    ;

    bx      lr 

A+B=R (OR)

 AxB=R (AND)

F+F=F

T+F=T

F+T=T

T+T=T

FxF=F

TxF=F

FxT=F

TxT=T

A+B=R (OR)

 AxB=R (AND)

F+F=F

1+F=T

F+1=T

T+T=T

FxF=F

1xF=F 는 곧 1xA=A

Fx1=F 는 곧 Ax1=A

TxT=T

(X+Y)'=R 

F+F=F가 F' = T

T+F=T가 T' = F

F+T=T가 T' = F

T+T=T가 T' = F

AxB=R

FxF=F

TxF=F

FxT=F

TxT=T

A'xB'=R

F'xF'=TxT=T

T'xF'=FxT=F

F'xT'=TxF=F

T'xT'=FxF=F

$ sudo cp pre-revprop-change.tmpl pre-revprop-change

hooks$ cat pre-revprop-change.tmpl

#!/bin/sh

# PRE-REVPROP-CHANGE HOOK

#

# The pre-revprop-change hook is invoked before a revision property

# is added, modified or deleted.  Subversion runs this hook by invoking

# a program (script, executable, binary, etc.) named 'pre-revprop-change'

# (for which this file is a template), with the following ordered

# arguments:

#

#   [1] REPOS-PATH   (the path to this repository)

#   [2] REVISION     (the revision being tweaked)

#   [3] USER         (the username of the person tweaking the property)

#   [4] PROPNAME     (the property being set on the revision)

#   [5] ACTION       (the property is being 'A'dded, 'M'odified, or 'D'eleted)

#

#   [STDIN] PROPVAL  ** the new property value is passed via STDIN.

#

# If the hook program exits with success, the propchange happens; but

# if it exits with failure (non-zero), the propchange doesn't happen.

# The hook program can use the 'svnlook' utility to examine the

# existing value of the revision property.

#

# WARNING: unlike other hooks, this hook MUST exist for revision

# properties to be changed.  If the hook does not exist, Subversion

# will behave as if the hook were present, but failed.  The reason

# for this is that revision properties are UNVERSIONED, meaning that

# a successful propchange is destructive;  the old value is gone

# forever.  We recommend the hook back up the old value somewhere.

#

# On a Unix system, the normal procedure is to have 'pre-revprop-change'

# invoke other programs to do the real work, though it may do the

# work itself too.

#

# Note that 'pre-revprop-change' must be executable by the user(s) who will

# invoke it (typically the user httpd runs as), and that user must

# have filesystem-level permission to access the repository.

#

# On a Windows system, you should name the hook program

# 'pre-revprop-change.bat' or 'pre-revprop-change.exe',

# but the basic idea is the same.

#

# The hook program typically does not inherit the environment of

# its parent process.  For example, a common problem is for the

# PATH environment variable to not be set to its usual value, so

# that subprograms fail to launch unless invoked via absolute path.

# If you're having unexpected problems with a hook program, the

# culprit may be unusual (or missing) environment variables.

#

# Here is an example hook script, for a Unix /bin/sh interpreter.

# For more examples and pre-written hooks, see those in

# /usr/share/subversion/hook-scripts, and in the repository at

# http://svn.collab.net/repos/svn/trunk/tools/hook-scripts/ and

# http://svn.collab.net/repos/svn/trunk/contrib/hook-scripts/

REPOS="$1"

REV="$2"

USER="$3"

PROPNAME="$4"

ACTION="$5"

if [ "$ACTION" = "M" -a "$PROPNAME" = "svn:log" ]; then exit 0; fi

echo "Changing revision properties other than svn:log is prohibited" >&2

exit 1