1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * kdebug.h: Defines and definitions for debugging the Linux kernel 4 * under various kernel debuggers. 5 * 6 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 7 */ 8 #ifndef _SPARC_KDEBUG_H 9 #define _SPARC_KDEBUG_H 10 11 #include <asm/openprom.h> 12 #include <asm/vaddrs.h> 13 14 /* Breakpoints are enter through trap table entry 126. So in sparc assembly 15 * if you want to drop into the debugger you do: 16 * 17 * t DEBUG_BP_TRAP 18 */ 19 20 #define DEBUG_BP_TRAP 126 21 22 #ifndef __ASSEMBLY__ 23 /* The debug vector is passed in %o1 at boot time. It is a pointer to 24 * a structure in the debuggers address space. Here is its format. 25 */ 26 27 typedef unsigned int (*debugger_funct)(void); 28 29 struct kernel_debug { 30 /* First the entry point into the debugger. You jump here 31 * to give control over to the debugger. 32 */ 33 unsigned long kdebug_entry; 34 unsigned long kdebug_trapme; /* Figure out later... */ 35 /* The following is the number of pages that the debugger has 36 * taken from to total pool. 37 */ 38 unsigned long *kdebug_stolen_pages; 39 /* Ok, after you remap yourself and/or change the trap table 40 * from what you were left with at boot time you have to call 41 * this synchronization function so the debugger can check out 42 * what you have done. 43 */ 44 debugger_funct teach_debugger; 45 }; /* I think that is it... */ 46 47 extern struct kernel_debug *linux_dbvec; 48 49 /* Use this macro in C-code to enter the debugger. */ sp_enter_debugger(void)50static inline void sp_enter_debugger(void) 51 { 52 __asm__ __volatile__("jmpl %0, %%o7\n\t" 53 "nop\n\t" : : 54 "r" (linux_dbvec) : "o7", "memory"); 55 } 56 57 #define SP_ENTER_DEBUGGER do { \ 58 if((linux_dbvec!=0) && ((*(short *)linux_dbvec)!=-1)) \ 59 sp_enter_debugger(); \ 60 } while(0) 61 62 enum die_val { 63 DIE_UNUSED, 64 DIE_OOPS, 65 }; 66 67 #endif /* !(__ASSEMBLY__) */ 68 69 /* Some nice offset defines for assembler code. */ 70 #define KDEBUG_ENTRY_OFF 0x0 71 #define KDEBUG_DUNNO_OFF 0x4 72 #define KDEBUG_DUNNO2_OFF 0x8 73 #define KDEBUG_TEACH_OFF 0xc 74 75 #endif /* !(_SPARC_KDEBUG_H) */ 76