x86, xsave: context switch support using xsave/xrstor

[safe/jmp/linux-2.6] / arch / x86 / kernel / traps_64.c

diff --git a/arch/x86/kernel/traps_64.c b/arch/x86/kernel/traps_64.c
index c664e69..38eb761 100644 (file)
--- a/arch/x86/kernel/traps_64.c
+++ b/arch/x86/kernel/traps_64.c
@@ -51,30 +51,10 @@
 #include <asm/pgalloc.h>
 #include <asm/proto.h>
 #include <asm/pda.h>
+#include <asm/traps.h>
 
 #include <mach_traps.h>
 
-asmlinkage void divide_error(void);
-asmlinkage void debug(void);
-asmlinkage void nmi(void);
-asmlinkage void int3(void);
-asmlinkage void overflow(void);
-asmlinkage void bounds(void);
-asmlinkage void invalid_op(void);
-asmlinkage void device_not_available(void);
-asmlinkage void double_fault(void);
-asmlinkage void coprocessor_segment_overrun(void);
-asmlinkage void invalid_TSS(void);
-asmlinkage void segment_not_present(void);
-asmlinkage void stack_segment(void);
-asmlinkage void general_protection(void);
-asmlinkage void page_fault(void);
-asmlinkage void coprocessor_error(void);
-asmlinkage void simd_coprocessor_error(void);
-asmlinkage void alignment_check(void);
-asmlinkage void spurious_interrupt_bug(void);
-asmlinkage void machine_check(void);
-
 int panic_on_unrecovered_nmi;
 int kstack_depth_to_print = 12;
 static unsigned int code_bytes = 64;
@@ -1151,7 +1131,14 @@ asmlinkage void math_state_restore(void)
        }
 
        clts();                         /* Allow maths ops (or we recurse) */
-       restore_fpu_checking(&me->thread.xstate->fxsave);
+       /*
+        * Paranoid restore. send a SIGSEGV if we fail to restore the state.
+        */
+       if (unlikely(restore_fpu_checking(me))) {
+               stts();
+               force_sig(SIGSEGV, me);
+               return;
+       }
        task_thread_info(me)->status |= TS_USEDFPU;
        me->fpu_counter++;
 }
@@ -1186,10 +1173,6 @@ void __init trap_init(void)
        set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
 #endif
        /*
-        * initialize the per thread extended state:
-        */
-       init_thread_xstate();
-       /*
         * Should be a barrier for any external CPU state:
         */
        cpu_init();