1.1 --- a/xen/arch/i386/pdb-stub.c	Wed Mar 10 18:19:16 2004 +0000
     1.2 +++ b/xen/arch/i386/pdb-stub.c	Thu Mar 11 08:29:36 2004 +0000
     1.3 @@ -29,7 +29,7 @@ static int pdb_stepping = 0;
     1.4  
     1.5  void pdb_put_packet (unsigned char *buffer, int ack);
     1.6  
     1.7 -static int pdb_initialized = 0;
     1.8 +int pdb_initialized = 0;
     1.9  static int pdb_serhnd      = -1;
    1.10  
    1.11  #define RX_SIZE 32

     2.1 --- a/xen/arch/i386/traps.c	Wed Mar 10 18:19:16 2004 +0000
     2.2 +++ b/xen/arch/i386/traps.c	Thu Mar 11 08:29:36 2004 +0000
     2.3 @@ -196,6 +196,8 @@ static inline void do_trap(int trapnr, c
     2.4      trap_info_t *ti;
     2.5      unsigned long fixup;
     2.6  
     2.7 +    __sti();
     2.8 +
     2.9      if (!(regs->xcs & 3))
    2.10          goto fault_in_hypervisor;
    2.11  
    2.12 @@ -257,6 +259,8 @@ asmlinkage void do_int3(struct pt_regs *
    2.13      struct guest_trap_bounce *gtb = guest_trap_bounce+smp_processor_id();
    2.14      trap_info_t *ti;
    2.15  
    2.16 +    __sti();
    2.17 +
    2.18      if ( (regs->xcs & 3) != 3 )
    2.19      {
    2.20          if ( pdb_handle_exception(3, regs) == 0 )
    2.21 @@ -323,6 +327,8 @@ asmlinkage void do_page_fault(struct pt_
    2.22  
    2.23      __asm__ __volatile__ ("movl %%cr2,%0" : "=r" (addr) : );
    2.24  
    2.25 +    __sti();
    2.26 +
    2.27      if ( unlikely(addr >= LDT_VIRT_START) && 
    2.28           (addr < (LDT_VIRT_START + (p->mm.ldt_ents*LDT_ENTRY_SIZE))) )
    2.29      {
    2.30 @@ -390,6 +396,8 @@ asmlinkage void do_general_protection(st
    2.31      trap_info_t *ti;
    2.32      unsigned long fixup;
    2.33  
    2.34 +    __sti();
    2.35 +
    2.36      /* Badness if error in ring 0, or result of an interrupt. */
    2.37      if ( !(regs->xcs & 3) || (error_code & 1) )
    2.38          goto gp_in_kernel;
    2.39 @@ -498,6 +506,8 @@ asmlinkage void math_state_restore(struc
    2.40      /* Prevent recursion. */
    2.41      clts();
    2.42  
    2.43 +    __sti();
    2.44 +
    2.45      if ( !test_bit(PF_USEDFPU, &current->flags) )
    2.46      {
    2.47          if ( test_bit(PF_DONEFPUINIT, &current->flags) )
    2.48 @@ -516,36 +526,13 @@ asmlinkage void math_state_restore(struc
    2.49      }
    2.50  }
    2.51  
    2.52 -asmlinkage void do_debug(struct pt_regs * regs, long error_code)
    2.53 +asmlinkage void do_debug_orig(struct pt_regs *regs, long error_code)
    2.54  {
    2.55      unsigned int condition;
    2.56      struct task_struct *tsk = current;
    2.57      struct guest_trap_bounce *gtb = guest_trap_bounce+smp_processor_id();
    2.58  
    2.59 -    __asm__ __volatile__("movl %%db6,%0" : "=r" (condition));
    2.60 -
    2.61 -    if ((condition & (1 << 14)) != (1 << 14))
    2.62 -    {
    2.63 -        printk ("\nwarning: debug trap w/o BS bit [0x%x]\n\n", condition);
    2.64 -    }
    2.65 -    __asm__("movl %0,%%db6" : : "r" (0));
    2.66 -
    2.67 -    if ( pdb_handle_exception(1, regs) != 0 )
    2.68 -    {
    2.69 -        tsk->thread.debugreg[6] = condition;
    2.70 -
    2.71 -	gtb->flags = GTBF_TRAP_NOCODE;
    2.72 -	gtb->cs    = tsk->thread.traps[1].cs;
    2.73 -	gtb->eip   = tsk->thread.traps[1].address;
    2.74 -    }
    2.75 -}
    2.76 -
    2.77 -
    2.78 -asmlinkage void do_debug_orig(struct pt_regs * regs, long error_code)
    2.79 -{
    2.80 -    unsigned int condition;
    2.81 -    struct task_struct *tsk = current;
    2.82 -    struct guest_trap_bounce *gtb = guest_trap_bounce+smp_processor_id();
    2.83 +    __sti();
    2.84  
    2.85      __asm__ __volatile__("movl %%db6,%0" : "=r" (condition));
    2.86  
    2.87 @@ -580,6 +567,37 @@ asmlinkage void do_debug_orig(struct pt_
    2.88  }
    2.89  
    2.90  
    2.91 +asmlinkage void do_debug(struct pt_regs *regs, long error_code)
    2.92 +{
    2.93 +    unsigned int condition;
    2.94 +    struct task_struct *tsk = current;
    2.95 +    struct guest_trap_bounce *gtb = guest_trap_bounce+smp_processor_id();
    2.96 +
    2.97 +    /* This handler is broken! Only use it if PDB is enabled. */
    2.98 +    if ( !pdb_initialized )
    2.99 +    {
   2.100 +        do_debug_orig(regs, error_code);
   2.101 +        return;
   2.102 +    }
   2.103 +
   2.104 +    __sti();
   2.105 +
   2.106 +    __asm__ __volatile__("movl %%db6,%0" : "=r" (condition));
   2.107 +    if ( (condition & (1 << 14)) != (1 << 14) )
   2.108 +        printk("\nwarning: debug trap w/o BS bit [0x%x]\n\n", condition);
   2.109 +    __asm__("movl %0,%%db6" : : "r" (0));
   2.110 +
   2.111 +    if ( pdb_handle_exception(1, regs) != 0 )
   2.112 +    {
   2.113 +        tsk->thread.debugreg[6] = condition;
   2.114 +
   2.115 +	gtb->flags = GTBF_TRAP_NOCODE;
   2.116 +	gtb->cs    = tsk->thread.traps[1].cs;
   2.117 +	gtb->eip   = tsk->thread.traps[1].address;
   2.118 +    }
   2.119 +}
   2.120 +
   2.121 +
   2.122  asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs,
   2.123  					  long error_code)
   2.124  { /* nothing */ }