From 60b2737de1b1ddfdb90f3ba622634eb49d6f3603 Mon Sep 17 00:00:00 2001 From: Paolo 'Blaisorblade' Giarrusso Date: Tue, 21 Jun 2005 17:16:25 -0700 Subject: [PATCH] uml: fix linkage of tt mode against NPTL With Al Viro To make sure switcheroo() can execute when we remap all the executable image, we used a trick to make it use a local copy of errno... this trick does not work with NPTL glibc, only with LinuxThreads, so use another (simpler) one to make it work anyway. Hopefully, a lot improved thanks to merging with the version of Al Viro (which had his part of problems, though, i.e. removing a fix to another bug and not fixing the problem on i386). Signed-off-by: Paolo 'Blaisorblade' Giarrusso Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/sys-x86_64/Makefile | 2 ++ arch/um/sys-x86_64/unmap.c | 25 +++++++++++++++++++++++++ 2 files changed, 27 insertions(+) create mode 100644 arch/um/sys-x86_64/unmap.c (limited to 'arch/um/sys-x86_64') diff --git a/arch/um/sys-x86_64/Makefile b/arch/um/sys-x86_64/Makefile index 608466ad6b2..2bc6f684901 100644 --- a/arch/um/sys-x86_64/Makefile +++ b/arch/um/sys-x86_64/Makefile @@ -29,3 +29,5 @@ thunk.S-dir = lib module.c-dir = kernel subdir- := util + +include arch/um/scripts/Makefile.unmap diff --git a/arch/um/sys-x86_64/unmap.c b/arch/um/sys-x86_64/unmap.c new file mode 100644 index 00000000000..bc7094cce47 --- /dev/null +++ b/arch/um/sys-x86_64/unmap.c @@ -0,0 +1,25 @@ +/* + * Copyright (C) 2000 Jeff Dike (jdike@karaya.com) + * Licensed under the GPL + */ + +#include +#include + +static int errno; + +static inline _syscall2(int,munmap,void *,start,size_t,len) +static inline _syscall6(void *,mmap,void *,addr,size_t,len,int,prot,int,flags,int,fd,off_t,offset) +int switcheroo(int fd, int prot, void *from, void *to, int size) +{ + if(munmap(to, size) < 0){ + return(-1); + } + if(mmap(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) != to){ + return(-1); + } + if(munmap(from, size) < 0){ + return(-1); + } + return(0); +} -- cgit v1.2.3