include/asm-sparc/kdebug.h

   1 /* $Id: kdebug.h,v 1.10 1997/12/14 23:24:40 ecd 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
  12 /* The debugger lives in 1MB of virtual address space right underneath
  13  * the boot prom.
  14  */
  15
  16 #define DEBUG_FIRSTVADDR       0xffc00000
  17 #define DEBUG_LASTVADDR        LINUX_OPPROM_BEGVM
  18
  19 /* Breakpoints are enter through trap table entry 126.  So in sparc assembly
  20  * if you want to drop into the debugger you do:
  21  *
  22  * t DEBUG_BP_TRAP
  23  */
  24
  25 #define DEBUG_BP_TRAP     126
  26
  27 #ifndef __ASSEMBLY__
  28 /* The debug vector is passed in %o1 at boot time.  It is a pointer to
  29  * a structure in the debuggers address space.  Here is its format.
  30  */
  31
  32 typedef unsigned int (*debugger_funct)(void);
  33
  34 struct kernel_debug {
  35         /* First the entry point into the debugger.  You jump here
  36          * to give control over to the debugger.
  37          */
  38         unsigned long kdebug_entry;
  39         unsigned long kdebug_trapme;   /* Figure out later... */
  40         /* The following is the number of pages that the debugger has
  41          * taken from to total pool.
  42          */
  43         unsigned long *kdebug_stolen_pages;
  44         /* Ok, after you remap yourself and/or change the trap table
  45          * from what you were left with at boot time you have to call
  46          * this synchronization function so the debugger can check out
  47          * what you have done.
  48          */
  49         debugger_funct teach_debugger;
  50 }; /* I think that is it... */
  51
  52 extern struct kernel_debug *linux_dbvec;
  53
  54 /* Use this macro in C-code to enter the debugger. */
  55 extern __inline__ void sp_enter_debugger(void)
  56 {
  57         __asm__ __volatile__("jmpl %0, %%o7\n\t"
  58                              "nop\n\t" : :
  59                              "r" (linux_dbvec) : "o7", "memory");
  60 }
  61
  62 #define SP_ENTER_DEBUGGER do { \
  63              if((linux_dbvec!=0) && ((*(short *)linux_dbvec)!=-1)) \
  64                sp_enter_debugger(); \
  65                        } while(0)
  66
  67 #endif /* !(__ASSEMBLY__) */
  68
  69 /* Some nice offset defines for assembler code. */
  70 #define KDEBUG_ENTRY_OFF    0x0
  71 #define KDEBUG_DUNNO_OFF    0x4
  72 #define KDEBUG_DUNNO2_OFF   0x8
  73 #define KDEBUG_TEACH_OFF    0xc
  74
  75 #endif /* !(_SPARC_KDEBUG_H) */