include/asm-sparc/kdebug.h

   1 /* $Id: kdebug.h,v 1.11 2000/06/04 06:23:53 anton Exp $
   2  * kdebug.h:  Defines and definitions for debugging the Linux kernel
   3  *            under various kernel debuggers.
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  */
   7 #ifndef _SPARC_KDEBUG_H
   8 #define _SPARC_KDEBUG_H
   9
  10 #include <asm/openprom.h>
  11 #include <asm/vaddrs.h>
  12
  13 /* Breakpoints are enter through trap table entry 126.  So in sparc assembly
  14  * if you want to drop into the debugger you do:
  15  *
  16  * t DEBUG_BP_TRAP
  17  */
  18
  19 #define DEBUG_BP_TRAP     126
  20
  21 #ifndef __ASSEMBLY__
  22 /* The debug vector is passed in %o1 at boot time.  It is a pointer to
  23  * a structure in the debuggers address space.  Here is its format.
  24  */
  25
  26 typedef unsigned int (*debugger_funct)(void);
  27
  28 struct kernel_debug {
  29         /* First the entry point into the debugger.  You jump here
  30          * to give control over to the debugger.
  31          */
  32         unsigned long kdebug_entry;
  33         unsigned long kdebug_trapme;   /* Figure out later... */
  34         /* The following is the number of pages that the debugger has
  35          * taken from to total pool.
  36          */
  37         unsigned long *kdebug_stolen_pages;
  38         /* Ok, after you remap yourself and/or change the trap table
  39          * from what you were left with at boot time you have to call
  40          * this synchronization function so the debugger can check out
  41          * what you have done.
  42          */
  43         debugger_funct teach_debugger;
  44 }; /* I think that is it... */
  45
  46 extern struct kernel_debug *linux_dbvec;
  47
  48 /* Use this macro in C-code to enter the debugger. */
  49 static inline void sp_enter_debugger(void)
  50 {
  51         __asm__ __volatile__("jmpl %0, %%o7\n\t"
  52                              "nop\n\t" : :
  53                              "r" (linux_dbvec) : "o7", "memory");
  54 }
  55
  56 #define SP_ENTER_DEBUGGER do { \
  57              if((linux_dbvec!=0) && ((*(short *)linux_dbvec)!=-1)) \
  58                sp_enter_debugger(); \
  59                        } while(0)
  60
  61 enum die_val {
  62         DIE_UNUSED,
  63 };
  64
  65 #endif /* !(__ASSEMBLY__) */
  66
  67 /* Some nice offset defines for assembler code. */
  68 #define KDEBUG_ENTRY_OFF    0x0
  69 #define KDEBUG_DUNNO_OFF    0x4
  70 #define KDEBUG_DUNNO2_OFF   0x8
  71 #define KDEBUG_TEACH_OFF    0xc
  72
  73 #endif /* !(_SPARC_KDEBUG_H) */