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Re: Minor fix to COFF .section change
- To: snowball3 at bigfoot dot com
- Subject: Re: Minor fix to COFF .section change
- From: Nick Clifton <nickc at cygnus dot com>
- Date: Mon, 3 Jul 2000 10:42:28 -0700
- CC: binutils at sourceware dot cygnus dot com
: There seems to be another problem in my opinion as a consequence of
: the current default.
: .section .foo,"w"
: .section .foo2,"d"
: 3 .foo 00000000 00000000 00000000 00000000 2**2
: ALLOC, LOAD, CODE
: 4 .foo2 00000000 00000000 00000000 00000000 2**2
: ALLOC, LOAD, DATA
: The !BFD version handles 'w' and 'd' the same way, I think the BFD version
: should too. Thoughts?
Hmm, well I agree that .foo ought to be a DATA section not a CODE
section, so that in this case they ought to end up with the same
Looking at the source in obj-coff.c it seems that "d" type sections
explicitly have SEC_DATA and SEC_LOAD set, whereas "w" sections do
not. I am not sure why this should be, although I suspect it is
because the m88k does not default to setting these attributes for its
I assume that your proposed patch fixes this problem as well ?
: > I'm concerned that there may be software out there that may
: > create a section, expecting it to be executable (the old way) but
: > finding it's not (the new way).
: I do believe the proposed new default matches the documentation, but
; I see your point. I looked through the GCC config files that define
: ASM_OUTPUT_SECTION, but it wasn't much help because they all use
: pretty much the same in always adding the attribute so there's never
: a doubt about what's intended. DJGPP should do the same in gcc 3.0.
: Anyway, as I see it there are several ways to go:
: 1. Go ahead and change the default attribute to match the docs.
: 2. Go with #1, but if it turns out to be a problem for a target, let
: it default to code.
: 2a. Let a target choose between defaulting to code or to data.
: 3. Recognize .eh_frame (as the .section doc allows) and set SEC_DATA
: for it.
: My preference is for door #2. Door #3 goes in the direction of
: automatically setting the right attributes for every special section
: there is.
I like 2/2a too. Can you try generating a new version of the patch
that creates a new target macro (eg TC_COFF_DEFAULT_SECTION_ATTRIBUTES)
which if not defined defaults to SEC_LOAD | SEC_DATA, and which then
uses this macro in obj_coff_section(). If you can also generate a
paragraph to go into doc/internals.texi describing this new macro,
that would be great.