/* * HW exception handling * * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> * Copyright (C) 2008 PetaLogix * * This file is subject to the terms and conditions of the GNU General * Public License.  See the file COPYING in the main directory of this * archive for more details. */ /* * This file handles the architecture-dependent parts of hardware exceptions */ #include <linux/export.h>#include <linux/kernel.h>#include <linux/signal.h>#include <linux/sched.h>#include <linux/kallsyms.h> #include <asm/exceptions.h>#include <asm/entry.h>		/* For KM CPU var */#include <linux/uaccess.h>#include <linux/errno.h>#include <linux/ptrace.h>#include <asm/current.h>#include <asm/cacheflush.h> #define MICROBLAZE_ILL_OPCODE_EXCEPTION	0x02#define MICROBLAZE_IBUS_EXCEPTION	0x03#define MICROBLAZE_DBUS_EXCEPTION	0x04#define MICROBLAZE_DIV_ZERO_EXCEPTION	0x05#define MICROBLAZE_FPU_EXCEPTION	0x06#define MICROBLAZE_PRIVILEGED_EXCEPTION	0x07 static DEFINE_SPINLOCK(die_lock); void die(const char *str, struct pt_regs *fp, long err){	console_verbose();	spin_lock_irq(&die_lock);	pr_warn("Oops: %s, sig: %ld\n", str, err);	show_regs(fp);	spin_unlock_irq(&die_lock);	/* do_exit() should take care of panic'ing from an interrupt	 * context so we don't handle it here	 */	do_exit(err);} /* for user application debugging */asmlinkage void sw_exception(struct pt_regs *regs){	_exception(SIGTRAP, regs, TRAP_BRKPT, regs->r16);	flush_dcache_range(regs->r16, regs->r16 + 0x4);	flush_icache_range(regs->r16, regs->r16 + 0x4);} void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr){	siginfo_t info; 	if (kernel_mode(regs))		die("Exception in kernel mode", regs, signr); 	info.si_signo = signr;	info.si_errno = 0;	info.si_code = code;	info.si_addr = (void __user *) addr;	force_sig_info(signr, &info, current);} asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,							int fsr, int addr){#ifdef CONFIG_MMU	addr = regs->pc;#endif #if 0	pr_warn("Exception %02x in %s mode, FSR=%08x PC=%08x ESR=%08x\n",			type, user_mode(regs) ? "user" : "kernel", fsr,			(unsigned int) regs->pc, (unsigned int) regs->esr);#endif 	switch (type & 0x1F) {	case MICROBLAZE_ILL_OPCODE_EXCEPTION:		if (user_mode(regs)) {			pr_debug("Illegal opcode exception in user mode\n");			_exception(SIGILL, regs, ILL_ILLOPC, addr);			return;		}		pr_warn("Illegal opcode exception in kernel mode.\n");		die("opcode exception", regs, SIGBUS);		break;	case MICROBLAZE_IBUS_EXCEPTION:		if (user_mode(regs)) {			pr_debug("Instruction bus error exception in user mode\n");			_exception(SIGBUS, regs, BUS_ADRERR, addr);			return;		}		pr_warn("Instruction bus error exception in kernel mode.\n");		die("bus exception", regs, SIGBUS);		break;	case MICROBLAZE_DBUS_EXCEPTION:		if (user_mode(regs)) {			pr_debug("Data bus error exception in user mode\n");			_exception(SIGBUS, regs, BUS_ADRERR, addr);			return;		}		pr_warn("Data bus error exception in kernel mode.\n");		die("bus exception", regs, SIGBUS);		break;	case MICROBLAZE_DIV_ZERO_EXCEPTION:		if (user_mode(regs)) {			pr_debug("Divide by zero exception in user mode\n");			_exception(SIGFPE, regs, FPE_INTDIV, addr);			return;		}		pr_warn("Divide by zero exception in kernel mode.\n");		die("Divide by zero exception", regs, SIGBUS);		break;	case MICROBLAZE_FPU_EXCEPTION:		pr_debug("FPU exception\n");		/* IEEE FP exception */		/* I removed fsr variable and use code var for storing fsr */		if (fsr & FSR_IO)			fsr = FPE_FLTINV;		else if (fsr & FSR_OF)			fsr = FPE_FLTOVF;		else if (fsr & FSR_UF)			fsr = FPE_FLTUND;		else if (fsr & FSR_DZ)			fsr = FPE_FLTDIV;		else if (fsr & FSR_DO)			fsr = FPE_FLTRES;		_exception(SIGFPE, regs, fsr, addr);		break; #ifdef CONFIG_MMU	case MICROBLAZE_PRIVILEGED_EXCEPTION:		pr_debug("Privileged exception\n");		_exception(SIGILL, regs, ILL_PRVOPC, addr);		break;#endif	default:	/* FIXME what to do in unexpected exception */		pr_warn("Unexpected exception %02x PC=%08x in %s mode\n",			type, (unsigned int) addr,			kernel_mode(regs) ? "kernel" : "user");	}	return;}