Re: GCC ASM(): Urgent!

["Martin v. Loewis" <martin@loewis.home.cs.tu-berlin.de>]

> 1. What does .frame,.mask and .fmask means?

I don't know anything about MIPS assembly, but looking at
config/mips/mips.c, it appears that 

.frame defines how the stack frame is organized, with the parameters
<register holding the frame pointer>, <size of the frame pointer>
<register holding the return value>

.mask and .fmask describe what registers are saved:
.mask <mask of gp registers saved>,<offset from vfp to store gp registers>
.fmask <mask of saved fp registers>,<offset from vfp to store fp registers>

> 2. Which registers are protected? Which registers I can use in my ASM()
> routine?

I can't answer this question.

> 3. How to support Mips R3900 instruction like MULT rd,rs,rt?

According to mips.h and mips.md, this is generated when

/* Generate three-operand multiply instructions for both SImode and DImode.  */
#define GENERATE_MULT3         (TARGET_MIPS3900				\
				&& !TARGET_MIPS16)

So it should be should be used if not on a 16bit target.

> 4. In GCC book within a macro "\" gives operator value, but the example
> gives compile error:
> .macro mname rd
>     .word   \ rd
> .endm

Again, I don't know.

> 5. How to debug and trace in the asm() instructions in a .C file?

What exactly do you mean by trace? Please use the option --save-temps;
this will produce a .s file, which contains the generated assembler
code for inspection.

Hope this helps,
Martin