Dan Kegel wrote:
You can override mmap() in wine by just changing all the places it's called. (Having control over the source is a wonderful thing.) But if you want mmap to behave truly differently, you'd probably need to change the kernel.
You can do that easily after glibc has loaded, but you won't know where glibc itself was loaded into the address space.
I discussed something like what Troy proposed with Vitaliy on IRC, but with the preloader looking up and overriding the mmap/munmap symbols in glibc. That would hopefully give Wine control over most mmaps and munmaps, possible save us from having to reserve memory in the preloader, and allow more control of the address space.
It has a few problems though. Firstly, we'd miss mmaps done with system calls. Secondly, we'd have to make assumptions about what areas of memory the kernel would let us map, and what areas of memory were already used in the address map.
I seem to recall somebody was working on a linux kernel module for wine that just dealt with program loading, but I can't recall who. Perhaps he'll surface and comment on this.
I had a go at creating a kernel based PE loader for Linux 2.6 by forward porting parts of David Howell's Wine kernel module. It currently compiles, but that's about all.
Haven't had much time to spend on it lately, because I've been busy with work ... ;)
Mike
