Hi Gus,
I need to put an specific machine code in any part of the memory. This code
is for some hardware module that can understand it. Of course, gcc will not
understand it, so I need to use .word 0xfc to create that code.
Now, I would like to create a pseudo assembler for my module, in following
way:
#define LOAD asm(".word 0xFC \n\t");
#define INSTRUCTION2 asm(.word 0x4b \n\t");
#define GOTO(label) asm(".word " #label " \n\t");
Yes, this will not work this way. #label will stringify the input and
will not produce an address.
Please do also keep in mind that .word might have different size
depending on the target architecture the assembler is configured for.
void mycode(void) {
LOAD
Label1:
INSTRUCTION2
GOTO(Label1)
}
It is generally possible to do use the asm() instruction for this
purpose, but I'm not sure if this is the best approach.
I would possibly try to separate this code from the code generated by
the compiler for the underlying CPU e.g. by putting these artificial
instructions into a separate section and make this section executable by
a linker script if executable permissions are required or to put this
into the data segment if only read permissions are required.
The only benefit using the asm() to me is to put the data into an
executable section, but the handling might be complex for your purpose
since you don't use assembly mnemonics beside .word.
Hope that helps,
Andi
