7  * Copyright (C) 1994 - 1999 by Ralf Baechle
14  * Copyright (C) 2001 - 2013 Tensilica Inc.
75 #define USER		0x02  macro
78 { EXCCAUSE_COPROCESSOR ## x ## _DISABLED, USER|KRNL, fast_coprocessor },\
90 { EXCCAUSE_ILLEGAL_INSTRUCTION,	USER,	   fast_illegal_instruction_user },
93 { EXCCAUSE_SYSTEM_CALL,		USER,	   fast_syscall_user },
97 { EXCCAUSE_LOAD_STORE_ERROR,	USER|KRNL, fast_load_store },
102 { EXCCAUSE_ALLOCA,		USER|KRNL, fast_alloca },
109 { EXCCAUSE_UNALIGNED,		USER,	   fast_unaligned },
116 { EXCCAUSE_ITLB_MISS,			USER|KRNL, fast_second_level_miss},
117 { EXCCAUSE_DTLB_MISS,			USER|KRNL, fast_second_level_miss},
119 { EXCCAUSE_STORE_CACHE_ATTRIBUTE,	USER|KRNL, fast_store_prohibited },
159 { -1, -1, 0 }
164  * 1. it contains three dispatch tables (fast_user, fast_kernel, default-c)
185 	if (copy_from_user(buf, (void __user *)(regs->pc & -16), sizeof(buf)) == 0) {  in dump_user_code()
198  * Unhandled Exceptions. Kill user task or panic if in kernel space.
203 	__die_if_kernel("Caught unhandled exception - should not happen",  in do_unhandled()
206 	/* If in user mode, send SIGILL signal to current process */  in do_unhandled()
208 			    "(pid = %d, pc = %#010lx) - should not happen\n"  in do_unhandled()
210 			    current->comm, task_pid_nr(current), regs->pc,  in do_unhandled()
211 			    regs->exccause);  in do_unhandled()
217  * Multi-hit exception. This if fatal!
231 #define IS_POW2(v) (((v) & ((v) - 1)) == 0)
235 #warning "Fake NMI is requested for PMM, but there are other IRQs at or above its level."
295 		unsigned level;  in do_interrupt()  local
297 		for (level = LOCKLEVEL; level > 0; --level) {  in do_interrupt()
298 			if (int_at_level & int_level_mask[level]) {  in do_interrupt()
299 				int_at_level &= int_level_mask[level];  in do_interrupt()
303 					unhandled |= int_level_mask[level];  in do_interrupt()
308 		if (level == 0)  in do_interrupt()
312 		unhandled ^= (int_at_level & -int_at_level);  in do_interrupt()
327 		if (copy_from_user(buf, (void __user *)regs->pc + 2, 5))  in check_div0()
331 		p = (const u8 *)regs->pc + 2;  in check_div0()
353 	if (regs->pc == current_thread_info()->ps_woe_fix_addr)  in do_illegal_instruction()
354 		regs->ps &= ~PS_WOE_MASK;  in do_illegal_instruction()
363 	/* If in user mode, send SIGILL signal to current process. */  in do_illegal_instruction()
366 			    current->comm, task_pid_nr(current), regs->pc);  in do_illegal_instruction()
373 	force_sig_fault(SIGFPE, FPE_INTDIV, (void __user *)regs->pc);  in do_div0()
383 			    regs->excvaddr, current->comm,  in do_load_store()
384 			    task_pid_nr(current), regs->pc);  in do_load_store()
385 	force_sig_fault(SIGBUS, BUS_ADRERR, (void *)regs->excvaddr);  in do_load_store()
390  * Handle unaligned memory accesses from user space. Kill task.
393  * accesses causes from user space.
403 			    regs->excvaddr, current->comm,  in do_unaligned_user()
404 			    task_pid_nr(current), regs->pc);  in do_unaligned_user()
405 	force_sig_fault(SIGBUS, BUS_ADRALN, (void *) regs->excvaddr);  in do_unaligned_user()
432 	/* If in user mode, send SIGTRAP signal to current process */  in do_debug()
446 /* Set exception C handler - for temporary use when probing exceptions */
467 	this_cpu_ptr(&debug_table)->debug_exception = debug_exception;  in trap_init_debug()
478  * - fast user		first dispatch table for user exceptions
479  * - fast kernel	first dispatch table for kernel exceptions
480  * - default C-handler	C-handler called by the default fast handler.
506 		if ((fast & USER) != 0)  in trap_init()
538 		pr_cont(" %08lx", regs->areg[i]);  in show_regs()
542 		regs->pc, regs->ps, regs->depc, regs->excvaddr);  in show_regs()
544 		regs->lbeg, regs->lend, regs->lcount, regs->sar);  in show_regs()
547 			regs->windowbase, regs->windowstart, regs->wmask,  in show_regs()
548 			regs->syscall);  in show_regs()
555 	if (kernel_text_address(frame->pc))  in show_trace_cb()
557 			loglvl, frame->pc, (void *)frame->pc);  in show_trace_cb()
587 	while (sf->off < sf->len) {  in show_stack_fragment_cb()
589 		size_t line_len = sf->len - sf->off > STACK_DUMP_LINE_SIZE ?  in show_stack_fragment_cb()
590 			STACK_DUMP_LINE_SIZE : sf->len - sf->off;  in show_stack_fragment_cb()
591 		bool arrow = sf->off == 0;  in show_stack_fragment_cb()
593 		if (frame && frame->sp == (unsigned long)(sf->sp + sf->off))  in show_stack_fragment_cb()
596 		__memcpy(line, sf->sp + sf->off, line_len);  in show_stack_fragment_cb()
597 		print_hex_dump(sf->loglvl, arrow ? "> " : "  ", DUMP_PREFIX_NONE,  in show_stack_fragment_cb()
600 		sf->off += STACK_DUMP_LINE_SIZE;  in show_stack_fragment_cb()
614 	sf.len = min((-(size_t)sp) & (THREAD_SIZE - STACK_DUMP_ENTRY_SIZE),  in show_stack()
643 		show_stack(NULL, (unsigned long *)regs->areg[1], KERN_INFO);  in die()