Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 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 */ |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame^] | 24 | #include <linux/uaccess.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/ptrace.h> |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 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 |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame^] | 34 | #define MICROBLAZE_PRIVILEGED_EXCEPTION 0x07 |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 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 | { |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame^] | 69 | #ifdef CONFIG_MMU |
| 70 | int code; |
| 71 | addr = regs->pc; |
| 72 | #endif |
| 73 | |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 74 | #if 0 |
| 75 | printk(KERN_WARNING "Exception %02x in %s mode, FSR=%08x PC=%08x ESR=%08x\n", |
| 76 | type, user_mode(regs) ? "user" : "kernel", fsr, |
| 77 | (unsigned int) regs->pc, (unsigned int) regs->esr); |
| 78 | #endif |
| 79 | |
| 80 | switch (type & 0x1F) { |
| 81 | case MICROBLAZE_ILL_OPCODE_EXCEPTION: |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame^] | 82 | if (user_mode(regs)) { |
| 83 | printk(KERN_WARNING "Illegal opcode exception in user mode.\n"); |
| 84 | _exception(SIGILL, regs, ILL_ILLOPC, addr); |
| 85 | return; |
| 86 | } |
| 87 | printk(KERN_WARNING "Illegal opcode exception in kernel mode.\n"); |
| 88 | die("opcode exception", regs, SIGBUS); |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 89 | break; |
| 90 | case MICROBLAZE_IBUS_EXCEPTION: |
| 91 | if (user_mode(regs)) { |
| 92 | printk(KERN_WARNING "Instruction bus error exception in user mode.\n"); |
| 93 | _exception(SIGBUS, regs, BUS_ADRERR, addr); |
| 94 | return; |
| 95 | } |
| 96 | printk(KERN_WARNING "Instruction bus error exception in kernel mode.\n"); |
| 97 | die("bus exception", regs, SIGBUS); |
| 98 | break; |
| 99 | case MICROBLAZE_DBUS_EXCEPTION: |
| 100 | if (user_mode(regs)) { |
| 101 | printk(KERN_WARNING "Data bus error exception in user mode.\n"); |
| 102 | _exception(SIGBUS, regs, BUS_ADRERR, addr); |
| 103 | return; |
| 104 | } |
| 105 | printk(KERN_WARNING "Data bus error exception in kernel mode.\n"); |
| 106 | die("bus exception", regs, SIGBUS); |
| 107 | break; |
| 108 | case MICROBLAZE_DIV_ZERO_EXCEPTION: |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame^] | 109 | if (user_mode(regs)) { |
| 110 | printk(KERN_WARNING "Divide by zero exception in user mode\n"); |
| 111 | _exception(SIGILL, regs, ILL_ILLOPC, addr); |
| 112 | return; |
| 113 | } |
| 114 | printk(KERN_WARNING "Divide by zero exception in kernel mode.\n"); |
| 115 | die("Divide by exception", regs, SIGBUS); |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 116 | break; |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 117 | case MICROBLAZE_FPU_EXCEPTION: |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame^] | 118 | printk(KERN_WARNING "FPU exception\n"); |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 119 | /* IEEE FP exception */ |
| 120 | /* I removed fsr variable and use code var for storing fsr */ |
| 121 | if (fsr & FSR_IO) |
| 122 | fsr = FPE_FLTINV; |
| 123 | else if (fsr & FSR_OF) |
| 124 | fsr = FPE_FLTOVF; |
| 125 | else if (fsr & FSR_UF) |
| 126 | fsr = FPE_FLTUND; |
| 127 | else if (fsr & FSR_DZ) |
| 128 | fsr = FPE_FLTDIV; |
| 129 | else if (fsr & FSR_DO) |
| 130 | fsr = FPE_FLTRES; |
| 131 | _exception(SIGFPE, regs, fsr, addr); |
| 132 | break; |
| 133 | |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame^] | 134 | #ifdef CONFIG_MMU |
| 135 | case MICROBLAZE_PRIVILEGED_EXCEPTION: |
| 136 | printk(KERN_WARNING "Privileged exception\n"); |
| 137 | /* "brk r0,r0" - used as debug breakpoint */ |
| 138 | if (get_user(code, (unsigned long *)regs->pc) == 0 |
| 139 | && code == 0x980c0000) { |
| 140 | _exception(SIGTRAP, regs, TRAP_BRKPT, addr); |
| 141 | } else { |
| 142 | _exception(SIGILL, regs, ILL_PRVOPC, addr); |
| 143 | } |
| 144 | break; |
| 145 | #endif |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 146 | default: |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame^] | 147 | /* FIXME what to do in unexpected exception */ |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 148 | printk(KERN_WARNING "Unexpected exception %02x " |
| 149 | "PC=%08x in %s mode\n", type, (unsigned int) addr, |
| 150 | kernel_mode(regs) ? "kernel" : "user"); |
| 151 | } |
| 152 | return; |
| 153 | } |