Inline Assembly under MIPS

[David Daney]

Mohamed Bamakhrama wrote:
> Hi all,
> I have some inline assembly code for MIPS. It contains ".set mips32"
> and ".set mips0". I tried to find some relevant documentation for
> those two directives but I couldn't find something useful.

As far as I know, these don't have good documentation.  I think they are 
hold overs from the SGI assembler.  Perhaps you can find a manual for 
that on the net somewhere.

> My question is what is the usage of those two directives and is there
> any manual/docs/howto for inline assembly using GCC under MIPS?
> 

Those .set directives override the the ISA that the assembler accepts. 
For example if you tell the assembler that you are assembling mips1 
code, it will give an error if you try to use instructions that are not 
part of the mips1 ISA.  The .set mips32 would allow you to use mips32 
ISA instructions that are not part of mips1.

There are only general (not mips specific) in-line assembly docs in the 
GCC documentation.  The gas documentation talks about some mips specific 
things.  You can get an instruction set reference manual from the MIPS 
web site.

David Daney