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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/sys-x86_64
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/sys-x86_64')
-rw-r--r--arch/um/sys-x86_64/Makefile3
-rw-r--r--arch/um/sys-x86_64/tls.c14
2 files changed, 16 insertions, 1 deletions
diff --git a/arch/um/sys-x86_64/Makefile b/arch/um/sys-x86_64/Makefile
index 1ee2ed1599be..b5fc22babddf 100644
--- a/arch/um/sys-x86_64/Makefile
+++ b/arch/um/sys-x86_64/Makefile
@@ -5,7 +5,8 @@
5# 5#
6 6
7obj-y = bugs.o delay.o fault.o ldt.o mem.o ptrace.o ptrace_user.o \ 7obj-y = bugs.o delay.o fault.o ldt.o mem.o ptrace.o ptrace_user.o \
8 sigcontext.o signal.o syscalls.o syscall_table.o sysrq.o ksyms.o 8 sigcontext.o signal.o syscalls.o syscall_table.o sysrq.o ksyms.o \
9 tls.o
9 10
10obj-$(CONFIG_MODE_SKAS) += stub.o stub_segv.o 11obj-$(CONFIG_MODE_SKAS) += stub.o stub_segv.o
11obj-$(CONFIG_MODULES) += um_module.o 12obj-$(CONFIG_MODULES) += um_module.o
diff --git a/arch/um/sys-x86_64/tls.c b/arch/um/sys-x86_64/tls.c
new file mode 100644
index 000000000000..ce1bf1b81c43
--- /dev/null
+++ b/arch/um/sys-x86_64/tls.c
@@ -0,0 +1,14 @@
1#include "linux/sched.h"
2
3void debug_arch_force_load_TLS(void)
4{
5}
6
7void clear_flushed_tls(struct task_struct *task)
8{
9}
10
11int arch_copy_tls(struct task_struct *t)
12{
13 return 0;
14}