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authorPaolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>2006-03-31 05:30:22 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-31 15:18:52 -0500
commitaa6758d4867cd07bd76105ade6177fe6148e559a (patch)
tree0053f855c885a6dc322337468a2c45b6b2f8ddd0 /arch/um/kernel/exec_kern.c
parent972410b0232e97609fcefc8e408fe3037fcd607b (diff)
[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 <blaisorblade@yahoo.it> Acked-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/kernel/exec_kern.c')
-rw-r--r--arch/um/kernel/exec_kern.c12
1 files changed, 1 insertions, 11 deletions
diff --git a/arch/um/kernel/exec_kern.c b/arch/um/kernel/exec_kern.c
index f9b346e05b00..c0cb627bf594 100644
--- a/arch/um/kernel/exec_kern.c
+++ b/arch/um/kernel/exec_kern.c
@@ -22,6 +22,7 @@
22 22
23void flush_thread(void) 23void flush_thread(void)
24{ 24{
25 arch_flush_thread(&current->thread.arch);
25 CHOOSE_MODE(flush_thread_tt(), flush_thread_skas()); 26 CHOOSE_MODE(flush_thread_tt(), flush_thread_skas());
26} 27}
27 28
@@ -74,14 +75,3 @@ long sys_execve(char __user *file, char __user *__user *argv,
74 unlock_kernel(); 75 unlock_kernel();
75 return(error); 76 return(error);
76} 77}
77
78/*
79 * Overrides for Emacs so that we follow Linus's tabbing style.
80 * Emacs will notice this stuff at the end of the file and automatically
81 * adjust the settings for this buffer only. This must remain at the end
82 * of the file.
83 * ---------------------------------------------------------------------------
84 * Local variables:
85 * c-file-style: "linux"
86 * End:
87 */