Re: Configurable Assembler?

Todd L. Cignetti <cignetti@cs.duke.edu> wrote:
>I am looking for an assembler that allows me to specify the instructions
>and the corresponding opcodes. Basically, I need to add new opcodes to
>an existing instruction set.


A problem with using an arbitrary assembler is that it doesn't
necessarily support the executable format used by your system. This
may or may not be a concern for you.


The simplest way to do this is to see if your current system
assembler allows you to put arbitrary words in the text section
of your code; e.g. can your assembler handle:


.text
add r3, r5, 100
.long 0x047f8000 ; this is machine code for new insn
add r4, r9, r3




If so, the simplest way to accomplish what you want is to
write a preprocessor that reads in the assembler file, convert
all the new instructions to their equivalent machine code, and
then run the system assembler on the output.


Mayan Moudgill
--
| Mayan Moudgill
| mayan@watson.ibm.com
--

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