diff options
| author | Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> | 2005-06-21 17:16:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-21 19:07:32 -0700 |
| commit | 60b2737de1b1ddfdb90f3ba622634eb49d6f3603 (patch) | |
| tree | a352eda5ca213cdae0a2eabd6693b8a4f573e38f /arch/um/sys-x86_64 | |
| parent | b77d6adc922b8bbf8b16b67f567958c42962cf88 (diff) | |
[PATCH] uml: fix linkage of tt mode against NPTL
With Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
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 <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/sys-x86_64')
| -rw-r--r-- | arch/um/sys-x86_64/Makefile | 2 | ||||
| -rw-r--r-- | arch/um/sys-x86_64/unmap.c | 25 |
2 files changed, 27 insertions, 0 deletions
diff --git a/arch/um/sys-x86_64/Makefile b/arch/um/sys-x86_64/Makefile index 608466ad6b22..2bc6f6849010 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 000000000000..bc7094cce47e --- /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 <linux/mman.h> +#include <asm/unistd.h> + +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); +} |