Supriya Ghosh (Editor)

Open Watcom Assembler

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Original author(s)
  
Open Watcom Assembler

Type
  
x86 assembler

Available in
  
English

Website
  
www.openwatcom.com

Operating system
  
DOS for x86-based PCs, Microsoft Windows, Linux for x86-based PCs, OS/2 for x86-based PCs, FreeBSD for x86-based PCs.

Open Watcom Assembler or WASM is an x86 assembler produced by Watcom and included as part of the Watcom C/C++ compiler. Further development is being done on the 32- and 64-bit JWASM project,. which more closely matches the syntax of Microsoft's assembler.

Contents

There are experimental assemblers for PowerPC, Alpha AXP, and MIPS.

Assembler

  • Native support for output formats Intel OMF output formats
  • Supports Intel x86 (Pentium MMX, Pentium III-4, 3DNow!, SSE and SSE2) instruction sets.
  • Supports Microsoft macro assembler (MASM) 5 and 6 syntax (incomplete).

    • Disassembler

    There is an associated Watcom disassembler, wdis. The assembler does not have listing facilities; instead the use of wdis for generating listings is recommended. wdis can read OMF, COFF and ELF object files and PE and ELF executables. It supports 16-bit and 32-bit x86 instruction set including MMX, 3DNow!, SSE, SSE2, and SSE3. Support for PowerPC, Alpha AXP, MIPS, and SPARC V8 instruction sets is also built in.

    JWasm & HJWASM

    JWasm is a fork of Wasm originated by Japheth with following features:

  • Native support for output formats Intel OMF (16/32-bit), MS Coff (32-bit and 64-bit), Elf (32-bit and 64-bit), Bin and DOS MZ.
  • Precompiled JWasm binaries are available for DOS, Windows and Linux. For OS/2 and FreeBSD, makefiles are supplied.
  • Supports Intel x86 (8086, 80186, 80286, 80386, 80486, Pentium, Pentium Pro), x86-64 instruction sets with SIMD (MMX, 3DNow!, SSE, SSE2, SSE3 and SSSE3, SSE4.1/2 (since Jwasm), AVX (since JWasm 2.06), VMX (Intel VT-x; AMD SVM, the latter though already implemented, currently still inactive) extensions (since JWasm 2.09)).
  • JWasm is written in C. The source is portable and has successfully been tested with Open Watcom, MS VC, GCC and more.
  • On Windows, JWasm can be used with both Win32Inc and Masm32. Since v2.01, it will also work with Sven B. Schreiber's SBS WALK32 Win32 Assembly Language Kit
  • C header files can be converted to include files for JWasm with Japheth's own dedicated h2incX.
  • JWasm's source code is released under the Sybase Open Watcom Public License, which allows free commercial and non-commercial use.
  • Fully supports Microsoft macro assembler 6 syntax, all MASM 8 instructions sets.

    • Japheth ceased development of JWASM in January 2014, but others on the Masm32 forum picked up where Japheth left off, adding support for AVX2 and developing support for AVX-512. JWASM has since then been named HJWASM, adding the prefix H in reference to Masm32 forum member Habran who started off this second WASM development continuation. The source is currently being hosted at Github

    References

    Open Watcom Assembler Wikipedia
    (Text) CC BY-SA


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