1 files changed, 32 insertions, 10 deletions

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index eb62cbcaa49..c95c8f4e790 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -52,6 +52,7 @@
 #include <asm/idle.h>
 #include <asm/syscalls.h>
 #include <asm/ds.h>
+#include <asm/debugreg.h>
 
 asmlinkage extern void ret_from_fork(void);
 
@@ -226,8 +227,7 @@ void __show_regs(struct pt_regs *regs, int all)
 
 void show_regs(struct pt_regs *regs)
 {
-        printk(KERN_INFO "CPU %d:", smp_processor_id());
-        __show_regs(regs, 1);
+        show_registers(regs);
         show_trace(NULL, regs, (void *)(regs + 1), regs->bp);
 }
 
@@ -297,12 +297,16 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
 
         p->thread.fs = me->thread.fs;
         p->thread.gs = me->thread.gs;
+        p->thread.io_bitmap_ptr = NULL;
 
         savesegment(gs, p->thread.gsindex);
         savesegment(fs, p->thread.fsindex);
         savesegment(es, p->thread.es);
         savesegment(ds, p->thread.ds);
 
+        err = -ENOMEM;
+        memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
+
         if (unlikely(test_tsk_thread_flag(me, TIF_IO_BITMAP))) {
                 p->thread.io_bitmap_ptr = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL);
                 if (!p->thread.io_bitmap_ptr) {
@@ -341,29 +345,46 @@ out:
                 kfree(p->thread.io_bitmap_ptr);
                 p->thread.io_bitmap_max = 0;
         }
+
         return err;
 }
 
-void
-start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
+static void
+start_thread_common(struct pt_regs *regs, unsigned long new_ip,
+                    unsigned long new_sp,
+                    unsigned int _cs, unsigned int _ss, unsigned int _ds)
 {
         loadsegment(fs, 0);
-        loadsegment(es, 0);
-        loadsegment(ds, 0);
+        loadsegment(es, _ds);
+        loadsegment(ds, _ds);
         load_gs_index(0);
         regs->ip                = new_ip;
         regs->sp                = new_sp;
         percpu_write(old_rsp, new_sp);
-        regs->cs                = __USER_CS;
-        regs->ss                = __USER_DS;
-        regs->flags             = 0x200;
+        regs->cs                = _cs;
+        regs->ss                = _ss;
+        regs->flags             = X86_EFLAGS_IF;
         set_fs(USER_DS);
         /*
          * Free the old FP and other extended state
          */
         free_thread_xstate(current);
 }
-EXPORT_SYMBOL_GPL(start_thread);
+
+void
+start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
+{
+        start_thread_common(regs, new_ip, new_sp,
+                            __USER_CS, __USER_DS, 0);
+}
+
+#ifdef CONFIG_IA32_EMULATION
+void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp)
+{
+        start_thread_common(regs, new_ip, new_sp,
+                            __USER32_CS, __USER32_DS, __USER32_DS);
+}
+#endif
 
 /*
  *      switch_to(x,y) should switch tasks from x to y.
@@ -495,6 +516,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
          */
         if (preload_fpu)
                 __math_state_restore();
+
         return prev_p;
 }