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Sam Ravnborgf5e706a2008-07-17 21:55:51 -07001/*
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
26typedef unsigned int (*debugger_funct)(void);
27
28struct 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
46extern struct kernel_debug *linux_dbvec;
47
48/* Use this macro in C-code to enter the debugger. */
49static 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
61enum 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) */