GAS doesn't pass sections like GCC?

[Doug Evans]

Dan Fowell writes:
 > Good call Rick!  I found that my inline asm without the C function yielded
 > the following in my main object file (before linking):
 >   8 .vect         000000a0  00000000  00000000  00035eb0  2**0
 >                   CONTENTS, RELOC, READONLY
 > 
 > But when inside the C function I got:
 >   8 .vect         000000d4  00000000  00000000  00035f40  2**2
 >                   CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
 > 
 > Does anyone know how to change the attributes of a section from within my
 > inline asm statement?  Does .section have any flags I can flip?

The standard way to determine this is to pass -S to gcc, study the .s file,
and see what gcc generates (it's a standard way to answer a plethora of
questions like this).

 > Here's that asm snippet again:
 > 	__asm__ ("
 > 		.global _isr
 > 		_isr:
 > 		.section .vect
 > 		[Interrupt Handler]
 > 		");
 > 
 > Also this asm statement is just floating in my C file.  Is that OK?

The problem is you've switched the section behind gcc's back.
As long as there aren't any subsequent functions in the file
or you switch the section back or you do something that causes
gcc to have to explicitly switch the section, you're ok.

 > Or is
 > there a better way besides having a separate asm file or putting it within a
 > C function?

I don't think there's necessarily a "better" way.
One caveat though.  Embedded newlines in strings are flagged by newer gcc's.

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