dsp 新手的弱问题

/*exercise.asm文件如下:*/
.title "exercise.asm"
.mmregs
STACK .usect "STACK",10h
.bss x,4
.bss a,4
.bss y,1

.data
table: .word 1
.word 2
.word 3
.word 4
.word 8
.word 6
.word 4
.word 2

.text
start: SSBX FRCT
STM #0,SWWSR
STM #STACK+10h,SP
STM #a,AR1
RPT #7
MVPD table,*AR1+

CALL SUM
end: B end

SUM: STM #a,AR3
STM #x,AR4
RPTZ A,#3
MAC *AR3+,*AR4+,A
STL A,@y
RET
.end

/*lnk.cmd文件如下:*/

MEMORY {
PAGE 0:
PROG: origin=0x0100, len=0x0e00
PAGE 1:
DATA: origin=0x0f00, len=0x01f0
}


SECTIONS {
.text: > PROG  PAGE 0
.data:  > PROG  PAGE 0
.bss :  > DATA  PAGE 1
STACK:  > DATA  PAGE 1
}

编译如下:
----------------------------  exercise.pjt - Debug  ----------------------------
"d:\program\ccs5000\c5400\cgtools\bin\cl500" -g -q -fr"D:/program/ccs5000/myprojects/exercise/Debug" -d"_DEBUG" -@"Debug.lkf" "exercise.asm"


"d:\program\ccs5000\c5400\cgtools\bin\cl500" -@"Debug.lkf"

>> warning: entry point symbol _c_int00 undefined

Build Complete,
  0 Errors, 1 Warnings, 0 Remarks.

请问这是什么原因?如何解决?