如何修復：此代碼中的“相關跳轉超出范圍 0007h 位元組”？使用notepad 在DOSBox中執行
我只是跳躍語法的新手，我不知道為什么會出錯。這個程式還沒有完成，我只需要找出跳轉是否出錯，以便我可以再次繼續我將要做的另一個流程。
記事本 代碼：
.model small
.stack 100h
.data ;string
Menu db 0dh,0ah, " MAIN MENU $" ;MAIN MENU
Cal db 0dh,0ah,0dh,0ah, "[1]Calculator $"
Con db 0dh,0ah, "[2]Conversion $"
Ex db 0dh,0ah, "[3]Exit $"
Pik db 0dh,0ah,0dh,0ah, "Pick your choice: $" ;Choose
SubC db 0dh,0ah, "Calculator Sub-MENU $" ;Calculator Sub-MENU
Ad db 0dh,0ah,0dh,0ah,"[1]Addition $"
Su db 0dh,0ah, "[2]Subtraction $"
Mu db 0dh,0ah, "[3]Multiplication $"
Dv db 0dh,0ah, "[4]Division $"
BkCM db 0dh,0ah, "[5]Back to Main MENU $"
PikA db 0dh,0ah, "Calculator: Addition $" ;Calculator: Addition
PikS db 0dh,0ah, "Calculator: Subtraction $" ;Calculator: Subtraction
PikM db 0dh,0ah, "Calculator: Multiplication $" ;Calculator: Multiplication
PikD db 0dh,0ah, "Calculator: Division $" ;Calculator: Division
BsT db 0dh,0ah,0dh,0ah,"[1]Base 10 $" ;Calculator: Base
BsE db 0dh,0ah,"[2]Base 11 $"
BkS db 0dh,0ah,"[3]Back to Sub-MENU $" ;ack to Sub-MENU
SubV db 0dh,0ah, "Conversion Sub-MENU $" ;Conversion Sub-MENU
Hex db 0dh,0ah,0dh,0ah,"[1]Base 8 to Base 16 $"
Oct db 0dh,0ah, "[2]Base 16 to Base 8 $"
Deci db 0dh,0ah, "[3]Base 8 to Base 10 $"
BkVM db 0dh,0ah, "[4]Back to Main MENU $"
Spc db 0dh,0ah, " $ " ;Spacing
.code
main proc
mov ax,@data ;initialize ds
mov ds,ax
Start: ;show MAIN MENU
mov ah,09h
lea dx, Spc ;new Line
int 21h
lea dx, Menu ;Main Menu
int 21h
lea dx, Cal
int 21h
lea dx, Con
int 21h
lea dx, Ex
int 21h
lea dx, Pik ;Choise
int 21h
mov ah,01h
int 21h
cmp al,31h ;cmp Logic
je CalSub
cmp al,32h
je ConSub
cmp al,33h
jge ExitP
CalSub: ;show Calculator Sub-MENU
mov ah,09h
lea dx, Spc ;new Line
int 21h
lea dx, SubC ;Calculator Sub-MENU
int 21h
lea dx, Ad
int 21h
lea dx, Su
int 21h
lea dx, Mu
int 21h
lea dx, Dv
int 21h
lea dx, BkCM
int 21h
lea dx,Pik ;Choice
int 21h
mov ah,01h
int 21h
cmp al,31h ;cmp Logic
je CalAd
cmp al,32h
je CalSu
cmp al,33h
je CalMu
cmp al,34h
je CalDv
cmp al,35h
je Start
ConSub: ;show Conversion Sub-MENU
mov ah,09h
lea dx, Spc ;new Line
int 21h
lea dx, SubV ;Conversion Sub-MENU
int 21h
lea dx, Hex
int 21h
lea dx, Oct
int 21h
lea dx, Deci
int 21h
lea dx, BkVM
int 21h
lea dx, Pik ;Choice
int 21h
ExitP:
int 20 ;Stop Program
CalAd: ;show Addition
mov ah,09
lea dx,Spc ;new Line
int 21h
lea dx,PikA ;Addition
int 21h
cmp al,31h ;Base Choices
je Base
CalSu: ;show Subtraction
mov ah,09
lea dx,Spc ;new Line
int 21h
lea dx,PikS ;Subtraction
int 21h
cmp al,32h ;Base Choices
je Base
CalMu: ;show Multiplication
mov ah,09
lea dx,Spc ;new Line
int 21h
lea dx,PikM ;Multiplication
int 21h
cmp al,33h ;Base Choices
je Base
CalDv: ;show Division
mov ah,09
lea dx,Spc ;new Line
int 21h
lea dx,PikD ;Division
int 21h
cmp al,34h ;Base Choices
je Base
Base: ;Show Base
mov ah,09h ;Base
lea dx,BsT
int 21h
lea dx,BsE
int 21h
lea dx,BkS
int 21h
lea dx,Pik ;Choice
int 21h
mov ah,01h
int 21h
cmp al,33h ;cmp to back in Calculator Sub-MENU
jnz CalSub
mov ah,4Ch ;end here
int 21h
main endp
end main
彈出的錯誤：
uj5u.com熱心網友回復：
短跳轉x86 指令的范圍限制為 -128.. 127。如果目標距離較遠，則必須對其進行不同的編碼，使用近跳轉繞過帶有反轉條件代碼的短條件跳轉。要么將目標子程序移近cmp logic，要么替換
cmp al,31h ;cmp Logic
je CalSub
cmp al,32h
je ConSub
和
cmp al,31h ; cmp Logic
jne @@not1 ; Inverted condition.
jmp CalSub ; Proxy near jump without range restriction.
@@not1: cmp al,32h
jne @@not2 ; Inverted condition.
jmp ConSub ; Proxy near jump without range restriction.
@@not2:
一些匯編程式會自動為 386 以前的 CPU 執行此替換，這些 CPU沒有條件 near jump。
另一種解決方案是帶有目標偏移量的單詞跳轉表：
.data
JumpTable: DW CalSub, ConSub, ExitP
.code ; cmp Logic
sub al,31h ; Let AL=0,1,2 for CalSub, ConSub, ExitP.
xor bx,bx
mov bl,al ; MOVZX BX,AL would be better, but N/A on 086.
add bx,bx ; Let BX=0,2,4 for CalSub, ConSub, ExitP.
jmp [JumpTable BX] ; Use BX as an index to JumpTable.
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