1 /* 2 * HW exception handling 3 * 4 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> 5 * Copyright (C) 2008 PetaLogix 6 * 7 * This file is subject to the terms and conditions of the GNU General 8 * Public License. See the file COPYING in the main directory of this 9 * archive for more details. 10 */ 11 12 /* 13 * This file handles the architecture-dependent parts of hardware exceptions 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/signal.h> 18 #include <linux/sched.h> 19 #include <linux/kallsyms.h> 20 #include <linux/module.h> 21 22 #include <asm/exceptions.h> 23 #include <asm/entry.h> /* For KM CPU var */ 24 #include <asm/uaccess.h> 25 #include <asm/errno.h> 26 #include <asm/ptrace.h> 27 #include <asm/current.h> 28 29 #define MICROBLAZE_ILL_OPCODE_EXCEPTION 0x02 30 #define MICROBLAZE_IBUS_EXCEPTION 0x03 31 #define MICROBLAZE_DBUS_EXCEPTION 0x04 32 #define MICROBLAZE_DIV_ZERO_EXCEPTION 0x05 33 #define MICROBLAZE_FPU_EXCEPTION 0x06 34 #define MICROBLAZE_PRIVILEG_EXCEPTION 0x07 35 36 static DEFINE_SPINLOCK(die_lock); 37 38 void die(const char *str, struct pt_regs *fp, long err) 39 { 40 console_verbose(); 41 spin_lock_irq(&die_lock); 42 printk(KERN_WARNING "Oops: %s, sig: %ld\n", str, err); 43 show_regs(fp); 44 spin_unlock_irq(&die_lock); 45 /* do_exit() should take care of panic'ing from an interrupt 46 * context so we don't handle it here 47 */ 48 do_exit(err); 49 } 50 51 void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr) 52 { 53 siginfo_t info; 54 55 if (kernel_mode(regs)) { 56 debugger(regs); 57 die("Exception in kernel mode", regs, signr); 58 } 59 info.si_signo = signr; 60 info.si_errno = 0; 61 info.si_code = code; 62 info.si_addr = (void __user *) addr; 63 force_sig_info(signr, &info, current); 64 } 65 66 asmlinkage void full_exception(struct pt_regs *regs, unsigned int type, 67 int fsr, int addr) 68 { 69 #if 0 70 printk(KERN_WARNING "Exception %02x in %s mode, FSR=%08x PC=%08x ESR=%08x\n", 71 type, user_mode(regs) ? "user" : "kernel", fsr, 72 (unsigned int) regs->pc, (unsigned int) regs->esr); 73 #endif 74 75 switch (type & 0x1F) { 76 case MICROBLAZE_ILL_OPCODE_EXCEPTION: 77 _exception(SIGILL, regs, ILL_ILLOPC, addr); 78 break; 79 case MICROBLAZE_IBUS_EXCEPTION: 80 if (user_mode(regs)) { 81 printk(KERN_WARNING "Instruction bus error exception in user mode.\n"); 82 _exception(SIGBUS, regs, BUS_ADRERR, addr); 83 return; 84 } 85 printk(KERN_WARNING "Instruction bus error exception in kernel mode.\n"); 86 die("bus exception", regs, SIGBUS); 87 break; 88 case MICROBLAZE_DBUS_EXCEPTION: 89 if (user_mode(regs)) { 90 printk(KERN_WARNING "Data bus error exception in user mode.\n"); 91 _exception(SIGBUS, regs, BUS_ADRERR, addr); 92 return; 93 } 94 printk(KERN_WARNING "Data bus error exception in kernel mode.\n"); 95 die("bus exception", regs, SIGBUS); 96 break; 97 case MICROBLAZE_DIV_ZERO_EXCEPTION: 98 printk(KERN_WARNING "Divide by zero exception\n"); 99 _exception(SIGILL, regs, ILL_ILLOPC, addr); 100 break; 101 102 case MICROBLAZE_FPU_EXCEPTION: 103 /* IEEE FP exception */ 104 /* I removed fsr variable and use code var for storing fsr */ 105 if (fsr & FSR_IO) 106 fsr = FPE_FLTINV; 107 else if (fsr & FSR_OF) 108 fsr = FPE_FLTOVF; 109 else if (fsr & FSR_UF) 110 fsr = FPE_FLTUND; 111 else if (fsr & FSR_DZ) 112 fsr = FPE_FLTDIV; 113 else if (fsr & FSR_DO) 114 fsr = FPE_FLTRES; 115 _exception(SIGFPE, regs, fsr, addr); 116 break; 117 118 default: 119 printk(KERN_WARNING "Unexpected exception %02x " 120 "PC=%08x in %s mode\n", type, (unsigned int) addr, 121 kernel_mode(regs) ? "kernel" : "user"); 122 } 123 return; 124 } 125