46 extern void xmon(struct pt_regs *regs);
47 extern int xmon_bpt(struct pt_regs *regs);
48 extern int xmon_sstep(struct pt_regs *regs);
49 extern int xmon_iabr_match(struct pt_regs *regs);
50 extern int xmon_dabr_match(struct pt_regs *regs);
51 extern void (*xmon_fault_handler)(struct pt_regs *regs);
55 void (*debugger)(struct pt_regs *regs) = xmon;
56 int (*debugger_bpt)(struct pt_regs *regs) = xmon_bpt;
57 int (*debugger_sstep)(struct pt_regs *regs) = xmon_sstep;
58 int (*debugger_iabr_match)(struct pt_regs *regs) = xmon_iabr_match;
59 int (*debugger_dabr_match)(struct pt_regs *regs) = xmon_dabr_match;
60 void (*debugger_fault_handler)(struct pt_regs *regs);
63 void (*debugger)(struct pt_regs *regs);
64 int (*debugger_bpt)(struct pt_regs *regs);
65 int (*debugger_sstep)(struct pt_regs *regs);
66 int (*debugger_iabr_match)(struct pt_regs *regs);
67 int (*debugger_dabr_match)(struct pt_regs *regs);
68 void (*debugger_fault_handler)(struct pt_regs *regs);
70 #define debugger(regs)			do { } while (0)  argument
71 #define debugger_bpt(regs)		0  argument
72 #define debugger_sstep(regs)		0  argument
73 #define debugger_iabr_match(regs)	0  argument
74 #define debugger_dabr_match(regs)	0  argument
106 _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)  in _exception()  argument
110 	if (!user_mode(regs)) {  in _exception()
111 		debugger(regs);  in _exception()
112 		die("Exception in kernel mode", regs, signr);  in _exception()
131 static inline int check_io_access(struct pt_regs *regs)  in check_io_access()  argument
135 	unsigned long msr = regs->msr;  in check_io_access()
138 	    && (fixup = search_exception_table(regs->nip)) != 0) {  in check_io_access()
147 		unsigned int *nip = (unsigned int *)regs->nip;  in check_io_access()
160 			       regs->gpr[rb] - _IO_BASE, nip);  in check_io_access()
161 			regs->nip = fixup;  in check_io_access()
172 #define get_reason(regs)	((regs)->dsisr)  argument
179 #define single_stepping(regs)	(current->thread.dbcr0 & DBCR0_IC)  argument
180 #define clear_single_step(regs)	(current->thread.dbcr0 &= ~DBCR0_IC)  argument
185 #define get_reason(regs)	((regs)->msr)  argument
191 #define single_stepping(regs)	((regs)->msr & MSR_SE)  argument
192 #define clear_single_step(regs)	((regs)->msr &= ~MSR_SE)  argument
196 MachineCheckException(struct pt_regs *regs)  in MachineCheckException()  argument
198 	unsigned long reason = get_reason(regs);  in MachineCheckException()
200 	if (user_mode(regs)) {  in MachineCheckException()
201 		_exception(SIGBUS, regs, BUS_ADRERR, regs->nip);  in MachineCheckException()
207 	bad_page_fault(regs, regs->dar, SIGBUS);  in MachineCheckException()
211 		debugger_fault_handler(regs);  in MachineCheckException()
214 	if (check_io_access(regs))  in MachineCheckException()
286 	debugger(regs);  in MachineCheckException()
287 	die("machine check", regs, SIGBUS);  in MachineCheckException()
291 SMIException(struct pt_regs *regs)  in SMIException()  argument
293 	debugger(regs);  in SMIException()
295 	show_regs(regs);  in SMIException()
301 UnknownException(struct pt_regs *regs)  in UnknownException()  argument
304 	       regs->nip, regs->msr, regs->trap, print_tainted());  in UnknownException()
305 	_exception(SIGTRAP, regs, 0, 0);  in UnknownException()
309 InstructionBreakpoint(struct pt_regs *regs)  in InstructionBreakpoint()  argument
311 	if (debugger_iabr_match(regs))  in InstructionBreakpoint()
313 	_exception(SIGTRAP, regs, TRAP_BRKPT, 0);  in InstructionBreakpoint()
317 RunModeException(struct pt_regs *regs)  in RunModeException()  argument
319 	_exception(SIGTRAP, regs, 0, 0);  in RunModeException()
336 emulate_instruction(struct pt_regs *regs)  in emulate_instruction()  argument
344 	if (!user_mode(regs))  in emulate_instruction()
347 	if (get_user(instword, (u32 *)(regs->nip)))  in emulate_instruction()
354 		regs->gpr[rd] = mfspr(PVR);  in emulate_instruction()
356 		regs->nip += 4;  in emulate_instruction()
367 static void emulate_single_step(struct pt_regs *regs)  in emulate_single_step()  argument
369 	if (single_stepping(regs)) {  in emulate_single_step()
370 		clear_single_step(regs);  in emulate_single_step()
371 		if (debugger_sstep(regs))  in emulate_single_step()
373 		_exception(SIGTRAP, regs, TRAP_TRACE, 0);  in emulate_single_step()
378 ProgramCheckException(struct pt_regs *regs)  in ProgramCheckException()  argument
380 	unsigned int reason = get_reason(regs);  in ProgramCheckException()
381 	extern int do_mathemu(struct pt_regs *regs);  in ProgramCheckException()
391 	if (!(reason & REASON_TRAP) && do_mathemu(regs) == 0) {  in ProgramCheckException()
392 		emulate_single_step(regs);  in ProgramCheckException()
402 		if (regs->msr & MSR_FP)  in ProgramCheckException()
416 		_exception(SIGFPE, regs, code, regs->nip);  in ProgramCheckException()
422 		if (debugger_bpt(regs))  in ProgramCheckException()
424 		_exception(SIGTRAP, regs, TRAP_BRKPT, 0);  in ProgramCheckException()
430 		if (emulate_instruction(regs) == 0) {  in ProgramCheckException()
431 			emulate_single_step(regs);  in ProgramCheckException()
434 		_exception(SIGILL, regs, ILL_PRVOPC, regs->nip);  in ProgramCheckException()
438 	_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);  in ProgramCheckException()
442 SingleStepException(struct pt_regs *regs)  in SingleStepException()  argument
444 	regs->msr &= ~MSR_SE;  /* Turn off 'trace' bit */  in SingleStepException()
445 	if (debugger_sstep(regs))  in SingleStepException()
447 	_exception(SIGTRAP, regs, TRAP_TRACE, 0);  in SingleStepException()
451 AlignmentException(struct pt_regs *regs)  in AlignmentException()  argument
455 	fixed = fix_alignment(regs);  in AlignmentException()
457 		regs->nip += 4;	/* skip over emulated instruction */  in AlignmentException()
458 		emulate_single_step(regs);  in AlignmentException()
463 		if (user_mode(regs))  in AlignmentException()
464 			_exception(SIGSEGV, regs, SEGV_ACCERR, regs->dar);  in AlignmentException()
466 			bad_page_fault(regs, regs->dar, SIGSEGV);  in AlignmentException()
469 	_exception(SIGBUS, regs, BUS_ADRALN, regs->dar);  in AlignmentException()
473 StackOverflow(struct pt_regs *regs)  in StackOverflow()  argument
476 	       current, regs->gpr[1]);  in StackOverflow()
477 	debugger(regs);  in StackOverflow()
478 	show_regs(regs);  in StackOverflow()
483 trace_syscall(struct pt_regs *regs)  in trace_syscall()  argument
486 	       current, current->pid, regs->nip, regs->link, regs->gpr[0],  in trace_syscall()
487 	       regs->ccr&0x10000000?"Error=":"", regs->gpr[3], print_tainted());  in trace_syscall()
492 SoftwareEmulation(struct pt_regs *regs)  in SoftwareEmulation()  argument
498 	if (!user_mode(regs)) {  in SoftwareEmulation()
499 		debugger(regs);  in SoftwareEmulation()
500 		die("Kernel Mode Software FPU Emulation", regs, SIGFPE);  in SoftwareEmulation()
504 	errcode = do_mathemu(regs);  in SoftwareEmulation()
506 	errcode = Soft_emulate_8xx(regs);  in SoftwareEmulation()
510 			_exception(SIGFPE, regs, 0, 0);  in SoftwareEmulation()
512 			_exception(SIGSEGV, regs, 0, 0);  in SoftwareEmulation()
514 			_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);  in SoftwareEmulation()
516 		emulate_single_step(regs);  in SoftwareEmulation()
522 void DebugException(struct pt_regs *regs)  in DebugException()  argument
528 	regs->msr &= ~MSR_DE;  /* Turn off 'debug' bit */  in DebugException()
533 		if (!user_mode(regs) && debugger_bpt(regs))  in DebugException()
535 		_exception(SIGTRAP, regs, 0, 0);  in DebugException()
542 		if (!user_mode(regs) && debugger_sstep(regs))  in DebugException()
544 		_exception(SIGTRAP, regs, 0, 0);  in DebugException()
551 TAUException(struct pt_regs *regs)  in TAUException()  argument
554 	       regs->nip, regs->msr, regs->trap, print_tainted());  in TAUException()
560 AltivecAssistException(struct pt_regs *regs)  in AltivecAssistException()  argument
562 	if (regs->msr & MSR_VEC)  in AltivecAssistException()