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 babdbe6..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;
@@ -355,17 +335,24 @@ static const struct stacktrace_ops print_trace_ops = {
        .address = print_trace_address,
 };
 
-void show_trace(struct task_struct *task, struct pt_regs *regs,
-               unsigned long *stack, unsigned long bp)
+static void
+show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
+               unsigned long *stack, unsigned long bp, char *log_lvl)
 {
        printk("\nCall Trace:\n");
-       dump_trace(task, regs, stack, bp, &print_trace_ops, NULL);
+       dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl);
        printk("\n");
 }
 
+void show_trace(struct task_struct *task, struct pt_regs *regs,
+               unsigned long *stack, unsigned long bp)
+{
+       show_trace_log_lvl(task, regs, stack, bp, "");
+}
+
 static void
-_show_stack(struct task_struct *task, struct pt_regs *regs,
-               unsigned long *sp, unsigned long bp)
+show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
+               unsigned long *sp, unsigned long bp, char *log_lvl)
 {
        unsigned long *stack;
        int i;
@@ -399,12 +386,12 @@ _show_stack(struct task_struct *task, struct pt_regs *regs,
                printk(" %016lx", *stack++);
                touch_nmi_watchdog();
        }
-       show_trace(task, regs, sp, bp);
+       show_trace_log_lvl(task, regs, sp, bp, log_lvl);
 }
 
 void show_stack(struct task_struct *task, unsigned long *sp)
 {
-       _show_stack(task, NULL, sp, 0);
+       show_stack_log_lvl(task, NULL, sp, 0, "");
 }
 
 /*
@@ -454,7 +441,8 @@ void show_registers(struct pt_regs *regs)
                u8 *ip;
 
                printk("Stack: ");
-               _show_stack(NULL, regs, (unsigned long *)sp, regs->bp);
+               show_stack_log_lvl(NULL, regs, (unsigned long *)sp,
+                               regs->bp, "");
                printk("\n");
 
                printk(KERN_EMERG "Code: ");
@@ -1143,7 +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++;
 }
@@ -1178,10 +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();