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> |
Michal Simek | 17b9314 | 2010-11-12 14:27:10 +0100 | [diff] [blame] | 28 | #include <asm/cacheflush.h> |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 29 | |
| 30 | #define MICROBLAZE_ILL_OPCODE_EXCEPTION 0x02 |
| 31 | #define MICROBLAZE_IBUS_EXCEPTION 0x03 |
| 32 | #define MICROBLAZE_DBUS_EXCEPTION 0x04 |
| 33 | #define MICROBLAZE_DIV_ZERO_EXCEPTION 0x05 |
| 34 | #define MICROBLAZE_FPU_EXCEPTION 0x06 |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame] | 35 | #define MICROBLAZE_PRIVILEGED_EXCEPTION 0x07 |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 36 | |
| 37 | static DEFINE_SPINLOCK(die_lock); |
| 38 | |
| 39 | void die(const char *str, struct pt_regs *fp, long err) |
| 40 | { |
| 41 | console_verbose(); |
| 42 | spin_lock_irq(&die_lock); |
| 43 | printk(KERN_WARNING "Oops: %s, sig: %ld\n", str, err); |
| 44 | show_regs(fp); |
| 45 | spin_unlock_irq(&die_lock); |
| 46 | /* do_exit() should take care of panic'ing from an interrupt |
| 47 | * context so we don't handle it here |
| 48 | */ |
| 49 | do_exit(err); |
| 50 | } |
| 51 | |
Michal Simek | 751f160 | 2010-08-03 11:26:51 +0200 | [diff] [blame] | 52 | /* for user application debugging */ |
Michal Simek | f699980 | 2011-02-07 11:36:25 +0100 | [diff] [blame] | 53 | asmlinkage void sw_exception(struct pt_regs *regs) |
Michal Simek | 751f160 | 2010-08-03 11:26:51 +0200 | [diff] [blame] | 54 | { |
| 55 | _exception(SIGTRAP, regs, TRAP_BRKPT, regs->r16); |
Michal Simek | 17b9314 | 2010-11-12 14:27:10 +0100 | [diff] [blame] | 56 | flush_dcache_range(regs->r16, regs->r16 + 0x4); |
| 57 | flush_icache_range(regs->r16, regs->r16 + 0x4); |
Michal Simek | 751f160 | 2010-08-03 11:26:51 +0200 | [diff] [blame] | 58 | } |
| 59 | |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 60 | void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr) |
| 61 | { |
| 62 | siginfo_t info; |
| 63 | |
| 64 | if (kernel_mode(regs)) { |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 65 | die("Exception in kernel mode", regs, signr); |
| 66 | } |
| 67 | info.si_signo = signr; |
| 68 | info.si_errno = 0; |
| 69 | info.si_code = code; |
| 70 | info.si_addr = (void __user *) addr; |
| 71 | force_sig_info(signr, &info, current); |
| 72 | } |
| 73 | |
| 74 | asmlinkage void full_exception(struct pt_regs *regs, unsigned int type, |
| 75 | int fsr, int addr) |
| 76 | { |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame] | 77 | #ifdef CONFIG_MMU |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame] | 78 | addr = regs->pc; |
| 79 | #endif |
| 80 | |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 81 | #if 0 |
Michal Simek | bfc32ad | 2009-09-15 09:49:53 +0200 | [diff] [blame] | 82 | printk(KERN_WARNING "Exception %02x in %s mode, FSR=%08x PC=%08x " \ |
| 83 | "ESR=%08x\n", |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 84 | type, user_mode(regs) ? "user" : "kernel", fsr, |
| 85 | (unsigned int) regs->pc, (unsigned int) regs->esr); |
| 86 | #endif |
| 87 | |
| 88 | switch (type & 0x1F) { |
| 89 | case MICROBLAZE_ILL_OPCODE_EXCEPTION: |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame] | 90 | if (user_mode(regs)) { |
Joe Perches | c4554c3 | 2010-09-11 22:10:51 -0700 | [diff] [blame] | 91 | pr_debug("Illegal opcode exception in user mode\n"); |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame] | 92 | _exception(SIGILL, regs, ILL_ILLOPC, addr); |
| 93 | return; |
| 94 | } |
Michal Simek | bfc32ad | 2009-09-15 09:49:53 +0200 | [diff] [blame] | 95 | printk(KERN_WARNING "Illegal opcode exception " \ |
| 96 | "in kernel mode.\n"); |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame] | 97 | die("opcode exception", regs, SIGBUS); |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 98 | break; |
| 99 | case MICROBLAZE_IBUS_EXCEPTION: |
| 100 | if (user_mode(regs)) { |
Joe Perches | c4554c3 | 2010-09-11 22:10:51 -0700 | [diff] [blame] | 101 | pr_debug("Instruction bus error exception in user mode\n"); |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 102 | _exception(SIGBUS, regs, BUS_ADRERR, addr); |
| 103 | return; |
| 104 | } |
Michal Simek | bfc32ad | 2009-09-15 09:49:53 +0200 | [diff] [blame] | 105 | printk(KERN_WARNING "Instruction bus error exception " \ |
| 106 | "in kernel mode.\n"); |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 107 | die("bus exception", regs, SIGBUS); |
| 108 | break; |
| 109 | case MICROBLAZE_DBUS_EXCEPTION: |
| 110 | if (user_mode(regs)) { |
Joe Perches | c4554c3 | 2010-09-11 22:10:51 -0700 | [diff] [blame] | 111 | pr_debug("Data bus error exception in user mode\n"); |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 112 | _exception(SIGBUS, regs, BUS_ADRERR, addr); |
| 113 | return; |
| 114 | } |
Michal Simek | bfc32ad | 2009-09-15 09:49:53 +0200 | [diff] [blame] | 115 | printk(KERN_WARNING "Data bus error exception " \ |
| 116 | "in kernel mode.\n"); |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 117 | die("bus exception", regs, SIGBUS); |
| 118 | break; |
| 119 | case MICROBLAZE_DIV_ZERO_EXCEPTION: |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame] | 120 | if (user_mode(regs)) { |
Joe Perches | c4554c3 | 2010-09-11 22:10:51 -0700 | [diff] [blame] | 121 | pr_debug("Divide by zero exception in user mode\n"); |
Michal Simek | 23902d9 | 2009-09-22 08:58:47 +0200 | [diff] [blame] | 122 | _exception(SIGILL, regs, FPE_INTDIV, addr); |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame] | 123 | return; |
| 124 | } |
Michal Simek | bfc32ad | 2009-09-15 09:49:53 +0200 | [diff] [blame] | 125 | printk(KERN_WARNING "Divide by zero exception " \ |
| 126 | "in kernel mode.\n"); |
Randy Dunlap | f3ff821 | 2010-04-21 14:11:34 -0700 | [diff] [blame] | 127 | die("Divide by zero exception", regs, SIGBUS); |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 128 | break; |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 129 | case MICROBLAZE_FPU_EXCEPTION: |
Joe Perches | c4554c3 | 2010-09-11 22:10:51 -0700 | [diff] [blame] | 130 | pr_debug("FPU exception\n"); |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 131 | /* IEEE FP exception */ |
| 132 | /* I removed fsr variable and use code var for storing fsr */ |
| 133 | if (fsr & FSR_IO) |
| 134 | fsr = FPE_FLTINV; |
| 135 | else if (fsr & FSR_OF) |
| 136 | fsr = FPE_FLTOVF; |
| 137 | else if (fsr & FSR_UF) |
| 138 | fsr = FPE_FLTUND; |
| 139 | else if (fsr & FSR_DZ) |
| 140 | fsr = FPE_FLTDIV; |
| 141 | else if (fsr & FSR_DO) |
| 142 | fsr = FPE_FLTRES; |
| 143 | _exception(SIGFPE, regs, fsr, addr); |
| 144 | break; |
| 145 | |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame] | 146 | #ifdef CONFIG_MMU |
| 147 | case MICROBLAZE_PRIVILEGED_EXCEPTION: |
Joe Perches | c4554c3 | 2010-09-11 22:10:51 -0700 | [diff] [blame] | 148 | pr_debug("Privileged exception\n"); |
Michal Simek | 0425609 | 2010-08-03 11:32:20 +0200 | [diff] [blame] | 149 | _exception(SIGILL, regs, ILL_PRVOPC, addr); |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame] | 150 | break; |
| 151 | #endif |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 152 | default: |
Michal Simek | 4bb73c3 | 2009-05-26 16:30:24 +0200 | [diff] [blame] | 153 | /* FIXME what to do in unexpected exception */ |
Michal Simek | c4df4bc | 2009-03-27 14:25:13 +0100 | [diff] [blame] | 154 | printk(KERN_WARNING "Unexpected exception %02x " |
| 155 | "PC=%08x in %s mode\n", type, (unsigned int) addr, |
| 156 | kernel_mode(regs) ? "kernel" : "user"); |
| 157 | } |
| 158 | return; |
| 159 | } |