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https://github.com/htfy96/smltranslator
An assembly translator for Simple Machine Language of <Computer Science an Overview>
https://github.com/htfy96/smltranslator
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An assembly translator for Simple Machine Language of <Computer Science an Overview>
- Host: GitHub
- URL: https://github.com/htfy96/smltranslator
- Owner: htfy96
- License: mit
- Created: 2015-03-22T06:22:56.000Z (almost 10 years ago)
- Default Branch: master
- Last Pushed: 2015-03-22T07:17:55.000Z (almost 10 years ago)
- Last Synced: 2023-02-26T18:11:53.782Z (almost 2 years ago)
- Language: Python
- Size: 137 KB
- Stars: 1
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
#Syntax of assembly file
The whole assembly program should be composed by following parts:
##;
`;` stands for the symbol of comment
##.DATA
`.DATA` indicates the beginning of data segment and declaration of variables
##Declatation of variables
Syntax:
```
VariableName Address
```
Examples:
```
X 21
Y 35
```
`VariableName` can only contain letters, numbers and _, and can't be all numbers.
##.CODE
`.CODE` stands for the beginning of code segment
##.BASE
`BASE Address` indicates the address where code segment start, and must be the next line of `.CODE`
##Statements
Here are the supported statements(case insensive):
```
;r s t stand for register from 0 to 7
;lm r,xy/var = 1RXY Read a number from address [xy/variable] to register r e.g lm 3,x
;lb r,xy/var = 2RXY Read a number [xy/variable] to register r e.g lb 4,15
;mov r,xy/var = 3RXY write a number from register r to address [xy/variable] e.g mov 0,y
;mov r,s = 40RS write a number from reg r to reg s e.g mov 1,0
;addc r,s,t = 5RST Complement Add r=s+t
;Addc s,t = 5SST Another form of complement adding s=s+t
;Addf r,s,t = 6RST Float Add r=s+t
;Addf s,t = 6SST Another form of float adding ，s=s+t
;Or r,s,t = 7RST Operator or r=s or t
;Or s,t = 7SST Another form of operator or s=s or t
;And r,s,t = 8RST Operator and r=s and t
;And s,t = 8SST Another form of operator and s=s and t
;Xor r,s,t = 9RST Operator xor r=s xor t
;Xor s,t = 9SST Another form of operator xor s=s xor t
;Rot R,X=AR0X Circular left shift, reg r x bits left
;J r,xy/label = BRXY Jump by condition, if reg r=reg r0 then jump to address [xy/label] e.g j 2,loopend
;J xy/label = B0XY Jump by all means, jump to address [xy/label] e.g j 0020
;Halt = C000 Halt the program
```
##Label
It is disturbing to calculate address in statement `J`, then came **label**:
Write a label before a statement to mark the address of this statement:
e.g
```
label:mov 2,3
```
Then you can write
```
j 2,label
```
to directly jump to the statement
##.ENTRY
`.ENTRY 00 ; Indicate the point where program start, not implemented yet`
#About
For more details, please look up `example1.txt` as well as `example2.txt`.
Translator for Simple Machine Language by [email protected] under MIT License.