commit 9ec789f1545f469b26a026e3f642b7b14c4601d2
author Peter Smith <peter.smith@linaro.org> Mon May 13 16:01:26 2019 +0000
committer Peter Smith <peter.smith@linaro.org> Mon May 13 16:01:26 2019 +0000
tree aa80eaf9038d9c3411ebaa6614ae3a88869958b7
parent d2085a5f147a11c487a72e63284e37e8d3792dee

[ELF] Full support for -n (--nmagic) and -N (--omagic) via common page

The -n (--nmagic) disables page alignment, and acts as a -Bstatic
The -N (--omagic) does what -n does but also marks the executable segment as
writeable. As page alignment is disabled headers are not allocated unless
explicit in the linker script.

To disable page alignment in LLD we choose to set the page sizes to 1 so
that any alignment based on the page size does nothing. To set the
Target->PageSize to 1 we implement -z common-page-size, which has the side
effect of allowing the user to set the value as well.

Setting the page alignments to 1 does mean that any use of
CONSTANT(MAXPAGESIZE) or CONSTANT(COMMONPAGESIZE) in a linker script will
return 1, unlike in ld.bfd. However given that -n and -N disable paging
these probably shouldn't be used in a linker script where -n or -N is in
use.

Differential Revision: https://reviews.llvm.org/D61688



git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@360593 91177308-0d34-0410-b5e6-96231b3b80d8