From aa6758d4867cd07bd76105ade6177fe6148e559a Mon Sep 17 00:00:00 2001 From: Paolo 'Blaisorblade' Giarrusso Date: Fri, 31 Mar 2006 02:30:22 -0800 Subject: [PATCH] uml: implement {get,set}_thread_area for i386 Implement sys_[gs]et_thread_area and the corresponding ptrace operations for UML. This is the main chunk, additional parts follow. This implementation is now well tested and has run reliably for some time, and we've understood all the previously existing problems. Their implementation saves the new GDT content and then forwards the call to the host when appropriate, i.e. immediately when the target process is running or on context switch otherwise (i.e. on fork and on ptrace() calls). In SKAS mode, we must switch registers on each context switch (because SKAS does not switches tls_array together with current->mm). Also, added get_cpu() locking; this has been done for SKAS mode, since TT does not need it (it does not use smp_processor_id()). Signed-off-by: Paolo 'Blaisorblade' Giarrusso Acked-by: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/include/os.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/um/include') diff --git a/arch/um/include/os.h b/arch/um/include/os.h index 5fb84e889b2b..e9e1db1e08d0 100644 --- a/arch/um/include/os.h +++ b/arch/um/include/os.h @@ -236,6 +236,10 @@ extern int run_helper_thread(int (*proc)(void *), void *arg, int stack_order); extern int helper_wait(int pid); + +/* tls.c */ +extern int os_set_thread_area(void *data, int pid); +extern int os_get_thread_area(void *data, int pid); /* umid.c */ extern int umid_file_name(char *name, char *buf, int len); -- cgit v1.2.2