https://github.com/grdsdev/tisa

tisa is an emulator for the Tiny ISA
https://github.com/grdsdev/tisa

c emulator interpreter

Last synced: 28 days ago
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tisa is an emulator for the Tiny ISA

• Host: GitHub
• URL: https://github.com/grdsdev/tisa
• Owner: grdsdev
• Created: 2018-09-15T13:16:56.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2020-04-29T10:05:13.000Z (over 4 years ago)
• Last Synced: 2023-10-19T04:15:40.889Z (about 1 year ago)
• Topics: c, emulator, interpreter
• Language: C
• Homepage:
• Size: 10.7 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# TISA

TISA stands for Tiny ISA.

## Bulding and executing

For building the project we're using cmake.

```

mkdir build

cd build

cmake ..

make

```

Then run with:

`./tisa ../input.s --dump`

## Supported instructions

- ADD rx, ry // rx = rx + ry

- SUB rx, ry

- DIV rx, ry

- MUL rx, ry

- BRZ rx, DES // PC += DES se rx = 0

- BRNZ rx, DES // PC += DES se rx != 0

- BRLZ rx, DES // PC += DES se rx < 0

- BRGZ rx, DES // PC += DES se rx > 0

- IBRZ rx, ADR // PC = MEM(ADR) se rx = 0

- MOV rx, ry // rx = ry

- LOADM rx, ADR // rx = MEM(ADR)

- STOREM rx, ADR // MEM(ADR) = rx

- LOADI rx, VAL // rx = VAL

- WRITE rx // printf(“%d\n”, rx)

- READ rx // scanf(“%d”, rx)

- EXIT // exit(0)

## Example

```c

int x = 0;

for (int i = 100; i > 0; i--) {

  for (int k = i; k > 0; k--) {

    x += k;

  }

}

printf("%d\n", x);

```

The `C` code above is translated to:

```assembly

LOADI r1, 0

LOADI r3, 1

LOADI r2, 100

MOV r4, r2

ADD r1, r4

SUB r4, r3

BRNZ r4, -2

SUB r2, r3

BRNZ r2, -5

WRITE r1

EXIT

```