https://github.com/amireh/hasm

A SIC/XE assembler, school homework
https://github.com/amireh/hasm

Last synced: 3 months ago
JSON representation

A SIC/XE assembler, school homework

• Host: GitHub
• URL: https://github.com/amireh/hasm
• Owner: amireh
• Created: 2011-11-22T00:58:01.000Z (over 13 years ago)
• Default Branch: master
• Last Pushed: 2011-11-28T08:21:06.000Z (over 13 years ago)
• Last Synced: 2024-12-28T14:51:59.966Z (5 months ago)
• Language: C++
• Homepage:
• Size: 1.55 MB
• Stars: 2
• Watchers: 3
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README

Awesome Lists containing this project

README

        
1.0 - Hax Assembler Overviw

The Hax Assembler (HASM) translates a hax assembly input (.hasm) file into a SIC/XE

compatible object program (.obj) which can be loaded by the Hax Loader.

This software is written for studying purposes.

1.1 - Hax Assembler Specifications

- SIC Format 1 and Format 2 support

- SIC/XE Format 3 and Format 4 support

- Literals support

- Program blocks support

- Relocatable programs only

- SIC/XE Register-to-Register instructions

- Addressing modes supported:

  1. Immediate addressing

  2. Indirect addressing

  3. Base-relative indexing

  4. PC-relative indexing

- Multiple-pass assembling

- Expression support

1.2 - SIC/XE Format Specifications

Instruction format field lengths are specified within {}, and are 1-bit long when

the braces are omitted.

1.2.0 - Format 1

  Length: 1 byte

  Format: [ opcode{8} ]

1.2.1 - Format 2

  Length: 2 bytes

  Format: [ opcode{8} ][ r1{4} ][ r2{4} ]

1.2.2 - Format 3 (SIC upward-compatible)

  Length: 3 bytes

  Format: [ opcode{6} ][n][i][x][b][p][e][ disp{12} ]

1.2.3 - Format 4 (SIC/XE only)

  Length: 4 bytes

  Format: [ opcode{6} ][n][i][x][b][p][e][ target address{20} ]

  Notation:

  Format 4 (extended) instructions are denoted by prefixing the first operand with '+', ie:

  +LDT    #MAXLEN