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Re: [GOLD] -Ttext does not relocate as expected
- From: Alan Modra <amodra at gmail dot com>
- To: ryan <stdstack at gmail dot com>
- Cc: Ian Lance Taylor <iant at google dot com>, Binutils <binutils at sourceware dot org>
- Date: Thu, 21 Mar 2013 13:15:38 +1030
- Subject: Re: [GOLD] -Ttext does not relocate as expected
- References: <CAOjn=HQxudFLCpUJqKw3jtBirW6X=nxUQPC4tGJDSW5=LD0jTQ at mail dot gmail dot com> <CAKOQZ8ytZu0iAOMoHqLF5q7nm8WRW1VUjv1GgRbns5cTy1+JEg at mail dot gmail dot com> <CAOjn=HQzvXgkaPpAaGbB-TbGQQHektrfMfdtA9wkaHw7xsS+aQ at mail dot gmail dot com> <CAKOQZ8x2sg1MEoaD_BvTFkAZHwxvjj1O5o_0GYVYFAsifYb4FA at mail dot gmail dot com> <CAOjn=HR3=q4AZkXiJYT+XEJmcEaXuf9UUiawTY=L8=QObCeUnw at mail dot gmail dot com>
On Wed, Mar 20, 2013 at 06:10:03PM -0700, ryan wrote:
> >>>>> ld -m elf_i386 -N -e start -Ttext 0x7c00 -o boot.out boot.o
It's indirectly caused by -N. I think the sequence of events is:
1) -N puts all input sections into the output .text section, including
a zero size .data
2) this marks the output .text as writable
3) the following code in layout.cc doesn't recognize .text as part of
the text segment
else if (parameters->options().user_set_Ttext()
&& ((*p)->flags() & elfcpp::PF_W) == 0)
{
are_addresses_set = true;
}
4) leading to
if (!are_addresses_set)
{
// Skip the address forward one page, maintaining the same
// position within the page. This lets us store both segments
--
Alan Modra
Australia Development Lab, IBM