About GCC porting 8051 and debugger

I'm 8051 gcc porting


My present work stage is working about md(machine description)file.


(referencig mn10200)


below code is in mn10200.md


(define_insn ""


    [(set (match_operand : QI 0 "general_operand" "=d, d, *a, d, d, m,
d, *a, *a")


            (match_operand : QI 1 "general_operand" "0, I, I, di ,m, d, *a,
d, i*a"))]


    "register_operand (operands[0], QImode)


      || register_operand (operands[1], QImode)"


    "@


    nop


    sub %0,%0


    sub %0,%0


    mov %S1,%0


    movbu %1,%0


    movb %1,%0


    mov %1,%0


    mov %1,%0


    mov %1,%0"


    [(set_attr "cc" "none, clobber, clobber, none_0hit, none_0hit,
none_0hit, none_0hit, none_0hit, none_0hit")])


At above code 2nd line and 3re line operand attribute definition,


I wanna know about contents of *a and di


also, I'm gonna making debugger.


As a Result of searching, gdb is, I wanna know this is right which I'm
finding


about debugger.


If this is right, I wanna konw about flow of this.


For examole,


1) Is it possible to make debugger without compiler


2) What's necessary source about making debugger


Reply entrusting it gives.


Good Luck~~

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