File: /usr/src/linux/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     extern __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     #endif /* !(__ASSEMBLY__) */
62     
63     /* Some nice offset defines for assembler code. */
64     #define KDEBUG_ENTRY_OFF    0x0
65     #define KDEBUG_DUNNO_OFF    0x4
66     #define KDEBUG_DUNNO2_OFF   0x8
67     #define KDEBUG_TEACH_OFF    0xc
68     
69     #endif /* !(_SPARC_KDEBUG_H) */
70