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
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