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Re: Strange LMA/VMA behavior with regions
- From: Anitha Boyapati <anitha dot boyapati at gmail dot com>
- To: binutils at sourceware dot org, amodra at gmail dot com
- Date: Thu, 12 May 2011 19:38:59 +0530
- Subject: Re: Strange LMA/VMA behavior with regions
- References: <BANLkTi=+O9YvCp42jT3k0fKiC4z0opvAdA@mail.gmail.com> <BANLkTinEBMoiGna1KJKn1KqtvNsHdHynoA@mail.gmail.com>
> On Wed, May 11, 2011 at 12:50:31PM +0530, Abnikant Singh wrote:
>> ? .text_os ALIGN(8) :
>
> This says to set the address of the output section .text_os. ?When you
> set the address, any input section alignment is ignored. ?This happens
I agree that ALIGN() overrides input section alignment. But if we set
address for VMA using ALIGN(), should it affect LMA too? I think it
should not.
To illustrate further, I'll ?use the initial output presented in the
previous post. Please refer to the row of section [ 1] .text_os.
Sections:
Idx Name ? ? ? ? ? ??Size ? ? ?VMA ? ? ? LMA ? ? ? File off ?Algn
?0 .mysec1_os ? ?00000002 ?80000000 ?80000000 ?00000400 ?2**0
? ? ? ? ? ? ? ? ? ? ? ? ? ?CONTENTS, ALLOC, LOAD, READONLY, CODE
?1 .text_os ? ? ? ? ?00000008 ?80000008 ?80000002 ?00000408 ?2**3
? ? ? ? ? ? ? ? ? ? ? ? ? ?CONTENTS, ALLOC, LOAD, READONLY, CODE
Here ?the value of LMA (?0x80000002) is not 8-aligned. ?The section
.text_os is described in linker script as:
.text_os ALIGN(8) :
?{
? ?*(.text .text.* )
...
Note that address of LMA is not set explicitly. In such a scenario it
is a little
counter-intuitive to see LMA not following input section's alignment
(2**3 in this case)?although no ALIGN() or AT() have been used. Looks
like a bug to me. ?Please let me know the reason if otherwise.
-- Anitha
(I was not subscribed to ML, so the conversation was copied from
archives. Formatting issues might turn up. Please excuse)