98 int (*board_be_handler)(struct pt_regs *regs, int is_fixup);
137 static void show_backtrace(struct task_struct *task, const struct pt_regs *regs)  in show_backtrace()  argument
139 	unsigned long sp = regs->regs[29];  in show_backtrace()
140 	unsigned long ra = regs->regs[31];  in show_backtrace()
141 	unsigned long pc = regs->cp0_epc;  in show_backtrace()
146 	if (raw_show_trace || user_mode(regs) || !__kernel_text_address(pc)) {  in show_backtrace()
163 	const struct pt_regs *regs)  in show_stacktrace()  argument
168 	unsigned long __user *sp = (unsigned long __user *)regs->regs[29];  in show_stacktrace()
189 	show_backtrace(task, regs);  in show_stacktrace()
194 	struct pt_regs regs;  in show_stack()  local
197 		regs.regs[29] = (unsigned long)sp;  in show_stack()
198 		regs.regs[31] = 0;  in show_stack()
199 		regs.cp0_epc = 0;  in show_stack()
202 			regs.regs[29] = task->thread.reg29;  in show_stack()
203 			regs.regs[31] = 0;  in show_stack()
204 			regs.cp0_epc = task->thread.reg31;  in show_stack()
208 			memcpy(&regs, kdb_current_regs, sizeof(regs));  in show_stack()
211 			prepare_frametrace(&regs);  in show_stack()
219 	show_stacktrace(task, &regs);  in show_stack()
242 static void __show_regs(const struct pt_regs *regs)  in __show_regs()  argument
245 	unsigned int cause = regs->cp0_cause;  in __show_regs()
261 			printk(" %0*lx", field, regs->regs[i]);  in __show_regs()
269 	printk("Acx    : %0*lx\n", field, regs->acx);  in __show_regs()
271 	printk("Hi    : %0*lx\n", field, regs->hi);  in __show_regs()
272 	printk("Lo    : %0*lx\n", field, regs->lo);  in __show_regs()
277 	printk("epc   : %0*lx %pS\n", field, regs->cp0_epc,  in __show_regs()
278 	       (void *) regs->cp0_epc);  in __show_regs()
279 	printk("ra    : %0*lx %pS\n", field, regs->regs[31],  in __show_regs()
280 	       (void *) regs->regs[31]);  in __show_regs()
282 	printk("Status: %08x	", (uint32_t) regs->cp0_status);  in __show_regs()
285 		if (regs->cp0_status & ST0_KUO)  in __show_regs()
287 		if (regs->cp0_status & ST0_IEO)  in __show_regs()
289 		if (regs->cp0_status & ST0_KUP)  in __show_regs()
291 		if (regs->cp0_status & ST0_IEP)  in __show_regs()
293 		if (regs->cp0_status & ST0_KUC)  in __show_regs()
295 		if (regs->cp0_status & ST0_IEC)  in __show_regs()
298 		if (regs->cp0_status & ST0_KX)  in __show_regs()
300 		if (regs->cp0_status & ST0_SX)  in __show_regs()
302 		if (regs->cp0_status & ST0_UX)  in __show_regs()
304 		switch (regs->cp0_status & ST0_KSU) {  in __show_regs()
318 		if (regs->cp0_status & ST0_ERL)  in __show_regs()
320 		if (regs->cp0_status & ST0_EXL)  in __show_regs()
322 		if (regs->cp0_status & ST0_IE)  in __show_regs()
331 		printk("BadVA : %0*lx\n", field, regs->cp0_badvaddr);  in __show_regs()
340 void show_regs(struct pt_regs *regs)  in show_regs()  argument
342 	__show_regs((struct pt_regs *)regs);  in show_regs()
345 void show_registers(struct pt_regs *regs)  in show_registers()  argument
350 	__show_regs(regs);  in show_registers()
363 	if (!user_mode(regs))  in show_registers()
366 	show_stacktrace(current, regs);  in show_registers()
367 	show_code((unsigned int __user *) regs->cp0_epc);  in show_registers()
372 static int regs_to_trapnr(struct pt_regs *regs)  in regs_to_trapnr()  argument
374 	return (regs->cp0_cause >> 2) & 0x1f;  in regs_to_trapnr()
379 void __noreturn die(const char *str, struct pt_regs *regs)  in die()  argument
386 	if (notify_die(DIE_OOPS, str, regs, 0, regs_to_trapnr(regs),  in die()
395 	show_registers(regs);  in die()
410 	if (regs && kexec_should_crash(current))  in die()
411 		crash_kexec(regs);  in die()
434 asmlinkage void do_be(struct pt_regs *regs)  in do_be()  argument
438 	int data = regs->cp0_cause & 4;  in do_be()
444 	if (data && !user_mode(regs))  in do_be()
445 		fixup = search_dbe_tables(exception_epc(regs));  in do_be()
451 		action = board_be_handler(regs, fixup != NULL);  in do_be()
458 			regs->cp0_epc = fixup->nextinsn;  in do_be()
471 	       field, regs->cp0_epc, field, regs->regs[31]);  in do_be()
472 	if (notify_die(DIE_OOPS, "bus error", regs, 0, regs_to_trapnr(regs),  in do_be()
476 	die_if_kernel("Oops", regs);  in do_be()
513 static inline int simulate_ll(struct pt_regs *regs, unsigned int opcode)  in simulate_ll()  argument
529 		((unsigned long)(regs->regs[(opcode & BASE) >> 21]) + offset);  in simulate_ll()
547 	regs->regs[(opcode & RT) >> 16] = value;  in simulate_ll()
552 static inline int simulate_sc(struct pt_regs *regs, unsigned int opcode)  in simulate_sc()  argument
569 		((unsigned long)(regs->regs[(opcode & BASE) >> 21]) + offset);  in simulate_sc()
578 		regs->regs[reg] = 0;  in simulate_sc()
585 	if (put_user(regs->regs[reg], vaddr))  in simulate_sc()
588 	regs->regs[reg] = 1;  in simulate_sc()
600 static int simulate_llsc(struct pt_regs *regs, unsigned int opcode)  in simulate_llsc()  argument
604 				1, regs, 0);  in simulate_llsc()
605 		return simulate_ll(regs, opcode);  in simulate_llsc()
609 				1, regs, 0);  in simulate_llsc()
610 		return simulate_sc(regs, opcode);  in simulate_llsc()
620 static int simulate_rdhwr(struct pt_regs *regs, int rd, int rt)  in simulate_rdhwr()  argument
625 			1, regs, 0);  in simulate_rdhwr()
628 		regs->regs[rt] = smp_processor_id();  in simulate_rdhwr()
631 		regs->regs[rt] = min(current_cpu_data.dcache.linesz,  in simulate_rdhwr()
635 		regs->regs[rt] = read_c0_count();  in simulate_rdhwr()
641 			regs->regs[rt] = 1;  in simulate_rdhwr()
644 			regs->regs[rt] = 2;  in simulate_rdhwr()
648 		regs->regs[rt] = ti->tp_value;  in simulate_rdhwr()
655 static int simulate_rdhwr_normal(struct pt_regs *regs, unsigned int opcode)  in simulate_rdhwr_normal()  argument
661 		simulate_rdhwr(regs, rd, rt);  in simulate_rdhwr_normal()
669 static int simulate_rdhwr_mm(struct pt_regs *regs, unsigned short opcode)  in simulate_rdhwr_mm()  argument
674 		simulate_rdhwr(regs, rd, rt);  in simulate_rdhwr_mm()
682 static int simulate_sync(struct pt_regs *regs, unsigned int opcode)  in simulate_sync()  argument
686 				1, regs, 0);  in simulate_sync()
693 asmlinkage void do_ov(struct pt_regs *regs)  in do_ov()  argument
699 		.si_addr = (void __user *)regs->cp0_epc,  in do_ov()
703 	die_if_kernel("Integer overflow", regs);  in do_ov()
766 static int simulate_fp(struct pt_regs *regs, unsigned int opcode,  in simulate_fp()  argument
792 	regs->cp0_epc = old_epc;  in simulate_fp()
793 	regs->regs[31] = old_ra;  in simulate_fp()
799 	sig = fpu_emulator_cop1Handler(regs, &current->thread.fpu, 1,  in simulate_fp()
821 asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)  in do_fpe()  argument
828 	if (notify_die(DIE_FP, "FP exception", regs, 0, regs_to_trapnr(regs),  in do_fpe()
836 	die_if_kernel("FP exception in kernel code", regs);  in do_fpe()
853 		sig = fpu_emulator_cop1Handler(regs, &current->thread.fpu, 1,  in do_fpe()
867 		fault_addr = (void __user *) regs->cp0_epc;  in do_fpe()
877 void do_trap_or_bp(struct pt_regs *regs, unsigned int code,  in do_trap_or_bp()  argument
884 	if (kgdb_ll_trap(DIE_TRAP, str, regs, code, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP)  in do_trap_or_bp()
888 	if (notify_die(DIE_TRAP, str, regs, code, regs_to_trapnr(regs),  in do_trap_or_bp()
902 		die_if_kernel(b, regs);  in do_trap_or_bp()
908 		info.si_addr = (void __user *) regs->cp0_epc;  in do_trap_or_bp()
912 		die_if_kernel("Kernel bug detected", regs);  in do_trap_or_bp()
924 		if (do_dsemulret(regs))  in do_trap_or_bp()
927 		die_if_kernel("Math emu break/trap", regs);  in do_trap_or_bp()
932 		die_if_kernel(b, regs);  in do_trap_or_bp()
937 asmlinkage void do_bp(struct pt_regs *regs)  in do_bp()  argument
939 	unsigned long epc = msk_isa16_mode(exception_epc(regs));  in do_bp()
945 	if (!user_mode(regs))  in do_bp()
949 	if (get_isa16_mode(regs->cp0_epc)) {  in do_bp()
989 		if (notify_die(DIE_BREAK, "debug", regs, bcode,  in do_bp()
990 			       regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP)  in do_bp()
995 		if (notify_die(DIE_SSTEPBP, "single_step", regs, bcode,  in do_bp()
996 			       regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP)  in do_bp()
1004 	do_trap_or_bp(regs, bcode, "Break");  in do_bp()
1016 asmlinkage void do_tr(struct pt_regs *regs)  in do_tr()  argument
1022 	unsigned long epc = msk_isa16_mode(exception_epc(regs));  in do_tr()
1025 	if (!user_mode(regs))  in do_tr()
1029 	if (get_isa16_mode(regs->cp0_epc)) {  in do_tr()
1045 	do_trap_or_bp(regs, tcode, "Trap");  in do_tr()
1057 asmlinkage void do_ri(struct pt_regs *regs)  in do_ri()  argument
1059 	unsigned int __user *epc = (unsigned int __user *)exception_epc(regs);  in do_ri()
1060 	unsigned long old_epc = regs->cp0_epc;  in do_ri()
1061 	unsigned long old31 = regs->regs[31];  in do_ri()
1071 	    likely(user_mode(regs)) &&  in do_ri()
1075 		status = mipsr2_decoder(regs, opcode, &fcr31);  in do_ri()
1096 	if (notify_die(DIE_RI, "RI Fault", regs, 0, regs_to_trapnr(regs),  in do_ri()
1100 	die_if_kernel("Reserved instruction in kernel code", regs);  in do_ri()
1102 	if (unlikely(compute_return_epc(regs) < 0))  in do_ri()
1105 	if (get_isa16_mode(regs->cp0_epc)) {  in do_ri()
1115 			status = simulate_rdhwr_mm(regs, opcode);  in do_ri()
1121 			status = simulate_llsc(regs, opcode);  in do_ri()
1124 			status = simulate_rdhwr_normal(regs, opcode);  in do_ri()
1127 			status = simulate_sync(regs, opcode);  in do_ri()
1130 			status = simulate_fp(regs, opcode, old_epc, old31);  in do_ri()
1137 		regs->cp0_epc = old_epc;		/* Undo skip-over.  */  in do_ri()
1138 		regs->regs[31] = old31;  in do_ri()
1193 	struct pt_regs *regs = data;  in default_cu2_call()  local
1196 			      "instruction", regs);  in default_cu2_call()
1328 asmlinkage void do_cpu(struct pt_regs *regs)  in do_cpu()  argument
1342 	cpid = (regs->cp0_cause >> CAUSEB_CE) & 3;  in do_cpu()
1345 		die_if_kernel("do_cpu invoked from kernel context!", regs);  in do_cpu()
1349 		epc = (unsigned int __user *)exception_epc(regs);  in do_cpu()
1350 		old_epc = regs->cp0_epc;  in do_cpu()
1351 		old31 = regs->regs[31];  in do_cpu()
1355 		if (unlikely(compute_return_epc(regs) < 0))  in do_cpu()
1358 		if (get_isa16_mode(regs->cp0_epc)) {  in do_cpu()
1368 				status = simulate_rdhwr_mm(regs, opcode);  in do_cpu()
1374 				status = simulate_llsc(regs, opcode);  in do_cpu()
1377 				status = simulate_rdhwr_normal(regs, opcode);  in do_cpu()
1384 			regs->cp0_epc = old_epc;	/* Undo skip-over.  */  in do_cpu()
1385 			regs->regs[31] = old31;  in do_cpu()
1416 		sig = fpu_emulator_cop1Handler(regs, &current->thread.fpu, 0,  in do_cpu()
1433 		raw_notifier_call_chain(&cu2_chain, CU2_EXCEPTION, regs);  in do_cpu()
1440 asmlinkage void do_msa_fpe(struct pt_regs *regs, unsigned int msacsr)  in do_msa_fpe()  argument
1445 	if (notify_die(DIE_MSAFP, "MSA FP exception", regs, 0,  in do_msa_fpe()
1446 		       regs_to_trapnr(regs), SIGFPE) == NOTIFY_STOP)  in do_msa_fpe()
1453 	die_if_kernel("do_msa_fpe invoked from kernel context!", regs);  in do_msa_fpe()
1459 asmlinkage void do_msa(struct pt_regs *regs)  in do_msa()  argument
1471 	die_if_kernel("do_msa invoked from kernel context!", regs);  in do_msa()
1480 asmlinkage void do_mdmx(struct pt_regs *regs)  in do_mdmx()  argument
1492 asmlinkage void do_watch(struct pt_regs *regs)  in do_watch()  argument
1522 asmlinkage void do_mcheck(struct pt_regs *regs)  in do_mcheck()  argument
1525 	int multi_match = regs->cp0_status & ST0_TS;  in do_mcheck()
1530 	show_regs(regs);  in do_mcheck()
1549 	if (!user_mode(regs))  in do_mcheck()
1552 	show_code((unsigned int __user *) regs->cp0_epc);  in do_mcheck()
1565 asmlinkage void do_mt(struct pt_regs *regs)  in do_mt()  argument
1595 	die_if_kernel("MIPS MT Thread exception in kernel", regs);  in do_mt()
1601 asmlinkage void do_dsp(struct pt_regs *regs)  in do_dsp()  argument
1609 asmlinkage void do_reserved(struct pt_regs *regs)  in do_reserved()  argument
1616 	show_regs(regs);  in do_reserved()
1618 	      (regs->cp0_cause & 0x7f) >> 2);  in do_reserved()
1807 void ejtag_exception_handler(struct pt_regs *regs)  in ejtag_exception_handler()  argument
1824 		old_epc = regs->cp0_epc;  in ejtag_exception_handler()
1825 		old_ra = regs->regs[31];  in ejtag_exception_handler()
1826 		regs->cp0_epc = depc;  in ejtag_exception_handler()
1827 		compute_return_epc(regs);  in ejtag_exception_handler()
1828 		depc = regs->cp0_epc;  in ejtag_exception_handler()
1829 		regs->cp0_epc = old_epc;  in ejtag_exception_handler()
1830 		regs->regs[31] = old_ra;  in ejtag_exception_handler()
1852 void __noreturn nmi_exception_handler(struct pt_regs *regs)  in nmi_exception_handler()  argument
1856 	raw_notifier_call_chain(&nmi_chain, 0, regs);  in nmi_exception_handler()
1859 		 smp_processor_id(), regs->cp0_epc);  in nmi_exception_handler()
1860 	regs->cp0_epc = read_c0_errorepc();  in nmi_exception_handler()
1861 	die(str, regs);  in nmi_exception_handler()