On Tue, 3 Feb 2015 10:16:33 +0100 Tijl Coosemans tijl@FreeBSD.org wrote:
On Mon, 02 Feb 2015 22:20:57 +0200 David Naylor dbn@freebsd.org wrote:
FreeBSD prefers to use a 0x200000 (super) page alignment however this causes the image base to be displaced from the requested 0x7b800000. Forcing a smaller page size ensures FreeBSD can place the image starting at 0x7b800000.
Just to clarify, the output of "readelf -l kernel32.dll.so" gives this:
Can somebody run this command on Linux with kernel32.dll.so from a wine64 build and post the output? FreeBSD also uses GNU binutils so I would expect the problem to exist on Linux as well.
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align LOAD 0x000000 0x7b800000 0x7b800000 0x0c9e74 0x0c9e74 R E 0x200000 LOAD 0x0ca000 0x7baca000 0x7baca000 0x1a7eb0 0x1a8550 RW 0x200000
The segments have an alignment of 0x200000 bytes. This places the first segment at 0x7b800000 and the second at 0x7ba00000+Offset. With a MemSiz of 0x1a8550 this pushes the second segment over 0x7bc00000 where ntdll has been mapped already so loading kernel32 at 0x7b800000 fails.
The patch forces a smaller alignment so the second segment fits below 0x7bc00000.