| Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 1 | /* |
| 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 | static 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 | enum 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) */ |