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/* $Id: kdebug.h,v 1.1 2005-12-20 11:32:11 jcastillo Exp $
 * kdebug.h:  Defines and definitions for debugging the Linux kernel
 *            under various kernel debuggers.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 */
#ifndef _SPARC_KDEBUG_H
#define _SPARC_KDEBUG_H
 
#include <asm/openprom.h>
 
/* The debugger lives in 1MB of virtual address space right underneath
 * the boot prom.
 */
 
#define DEBUG_FIRSTVADDR       0xffc00000
#define DEBUG_LASTVADDR        LINUX_OPPROM_BEGVM
 
/* Breakpoints are enter through trap table entry 126.  So in sparc assembly
 * if you want to drop into the debugger you do:
 *
 * t DEBUG_BP_TRAP
 */
 
#define DEBUG_BP_TRAP     126
 
#ifndef __ASSEMBLY__
/* The debug vector is passed in %o1 at boot time.  It is a pointer to
 * a structure in the debuggers address space.  Here is its format.
 */
 
typedef unsigned int (*debugger_funct)(void);
 
struct kernel_debug {
	/* First the entry point into the debugger.  You jump here
	 * to give control over to the debugger.
	 */
	unsigned long kdebug_entry;
	unsigned long kdebug_trapme;   /* Figure out later... */
	/* The following is the number of pages that the debugger has
	 * taken from to total pool.
	 */
	unsigned long *kdebug_stolen_pages;
	/* Ok, after you remap yourself and/or change the trap table
	 * from what you were left with at boot time you have to call
	 * this synchronization function so the debugger can check out
	 * what you have done.
	 */
	debugger_funct teach_debugger;
}; /* I think that is it... */
 
extern struct kernel_debug *linux_dbvec;
 
/* Use this macro in C-code to enter the debugger. */
extern __inline__ void sp_enter_debugger(void)
{
	__asm__ __volatile__("jmpl %0, %%o7\n\t"
			     "nop\n\t" : :
			     "r" (linux_dbvec) : "o7", "memory");
}
 
#define SP_ENTER_DEBUGGER do { \
	     if((linux_dbvec!=0) && ((*(short *)linux_dbvec)!=-1)) \
	       sp_enter_debugger(); \
		       } while(0)
 
#endif /* !(__ASSEMBLY__) */
 
/* Some nice offset defines for assembler code. */
#define KDEBUG_ENTRY_OFF    0x0
#define KDEBUG_DUNNO_OFF    0x4
#define KDEBUG_DUNNO2_OFF   0x8
#define KDEBUG_TEACH_OFF    0xc
 
/* ugh... */
#define TRAP_TRACE(reg1, reg2) \
 
 
#endif /* !(_SPARC_KDEBUG_H) */