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Michal Simekc4df4bc2009-03-27 14:25:13 +01001/*
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 Simek4bb73c32009-05-26 16:30:24 +020024#include <linux/uaccess.h>
25#include <linux/errno.h>
26#include <linux/ptrace.h>
Michal Simekc4df4bc2009-03-27 14:25:13 +010027#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 Simek4bb73c32009-05-26 16:30:24 +020034#define MICROBLAZE_PRIVILEGED_EXCEPTION 0x07
Michal Simekc4df4bc2009-03-27 14:25:13 +010035
36static DEFINE_SPINLOCK(die_lock);
37
38void 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
Michal Simek751f1602010-08-03 11:26:51 +020051/* for user application debugging */
52void sw_exception(struct pt_regs *regs)
53{
54 _exception(SIGTRAP, regs, TRAP_BRKPT, regs->r16);
55}
56
Michal Simekc4df4bc2009-03-27 14:25:13 +010057void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
58{
59 siginfo_t info;
60
61 if (kernel_mode(regs)) {
Michal Simekc4df4bc2009-03-27 14:25:13 +010062 die("Exception in kernel mode", regs, signr);
63 }
64 info.si_signo = signr;
65 info.si_errno = 0;
66 info.si_code = code;
67 info.si_addr = (void __user *) addr;
68 force_sig_info(signr, &info, current);
69}
70
71asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
72 int fsr, int addr)
73{
Michal Simek4bb73c32009-05-26 16:30:24 +020074#ifdef CONFIG_MMU
75 int code;
76 addr = regs->pc;
77#endif
78
Michal Simekc4df4bc2009-03-27 14:25:13 +010079#if 0
Michal Simekbfc32ad2009-09-15 09:49:53 +020080 printk(KERN_WARNING "Exception %02x in %s mode, FSR=%08x PC=%08x " \
81 "ESR=%08x\n",
Michal Simekc4df4bc2009-03-27 14:25:13 +010082 type, user_mode(regs) ? "user" : "kernel", fsr,
83 (unsigned int) regs->pc, (unsigned int) regs->esr);
84#endif
85
86 switch (type & 0x1F) {
87 case MICROBLAZE_ILL_OPCODE_EXCEPTION:
Michal Simek4bb73c32009-05-26 16:30:24 +020088 if (user_mode(regs)) {
Michal Simekbfc32ad2009-09-15 09:49:53 +020089 pr_debug(KERN_WARNING "Illegal opcode exception " \
90 "in user mode.\n");
Michal Simek4bb73c32009-05-26 16:30:24 +020091 _exception(SIGILL, regs, ILL_ILLOPC, addr);
92 return;
93 }
Michal Simekbfc32ad2009-09-15 09:49:53 +020094 printk(KERN_WARNING "Illegal opcode exception " \
95 "in kernel mode.\n");
Michal Simek4bb73c32009-05-26 16:30:24 +020096 die("opcode exception", regs, SIGBUS);
Michal Simekc4df4bc2009-03-27 14:25:13 +010097 break;
98 case MICROBLAZE_IBUS_EXCEPTION:
99 if (user_mode(regs)) {
Michal Simekbfc32ad2009-09-15 09:49:53 +0200100 pr_debug(KERN_WARNING "Instruction bus error " \
101 "exception in user mode.\n");
Michal Simekc4df4bc2009-03-27 14:25:13 +0100102 _exception(SIGBUS, regs, BUS_ADRERR, addr);
103 return;
104 }
Michal Simekbfc32ad2009-09-15 09:49:53 +0200105 printk(KERN_WARNING "Instruction bus error exception " \
106 "in kernel mode.\n");
Michal Simekc4df4bc2009-03-27 14:25:13 +0100107 die("bus exception", regs, SIGBUS);
108 break;
109 case MICROBLAZE_DBUS_EXCEPTION:
110 if (user_mode(regs)) {
Michal Simekbfc32ad2009-09-15 09:49:53 +0200111 pr_debug(KERN_WARNING "Data bus error exception " \
112 "in user mode.\n");
Michal Simekc4df4bc2009-03-27 14:25:13 +0100113 _exception(SIGBUS, regs, BUS_ADRERR, addr);
114 return;
115 }
Michal Simekbfc32ad2009-09-15 09:49:53 +0200116 printk(KERN_WARNING "Data bus error exception " \
117 "in kernel mode.\n");
Michal Simekc4df4bc2009-03-27 14:25:13 +0100118 die("bus exception", regs, SIGBUS);
119 break;
120 case MICROBLAZE_DIV_ZERO_EXCEPTION:
Michal Simek4bb73c32009-05-26 16:30:24 +0200121 if (user_mode(regs)) {
Michal Simekbfc32ad2009-09-15 09:49:53 +0200122 pr_debug(KERN_WARNING "Divide by zero exception " \
123 "in user mode\n");
Michal Simek23902d92009-09-22 08:58:47 +0200124 _exception(SIGILL, regs, FPE_INTDIV, addr);
Michal Simek4bb73c32009-05-26 16:30:24 +0200125 return;
126 }
Michal Simekbfc32ad2009-09-15 09:49:53 +0200127 printk(KERN_WARNING "Divide by zero exception " \
128 "in kernel mode.\n");
Randy Dunlapf3ff8212010-04-21 14:11:34 -0700129 die("Divide by zero exception", regs, SIGBUS);
Michal Simekc4df4bc2009-03-27 14:25:13 +0100130 break;
Michal Simekc4df4bc2009-03-27 14:25:13 +0100131 case MICROBLAZE_FPU_EXCEPTION:
Michal Simekbfc32ad2009-09-15 09:49:53 +0200132 pr_debug(KERN_WARNING "FPU exception\n");
Michal Simekc4df4bc2009-03-27 14:25:13 +0100133 /* IEEE FP exception */
134 /* I removed fsr variable and use code var for storing fsr */
135 if (fsr & FSR_IO)
136 fsr = FPE_FLTINV;
137 else if (fsr & FSR_OF)
138 fsr = FPE_FLTOVF;
139 else if (fsr & FSR_UF)
140 fsr = FPE_FLTUND;
141 else if (fsr & FSR_DZ)
142 fsr = FPE_FLTDIV;
143 else if (fsr & FSR_DO)
144 fsr = FPE_FLTRES;
145 _exception(SIGFPE, regs, fsr, addr);
146 break;
147
Michal Simek4bb73c32009-05-26 16:30:24 +0200148#ifdef CONFIG_MMU
149 case MICROBLAZE_PRIVILEGED_EXCEPTION:
Michal Simekbfc32ad2009-09-15 09:49:53 +0200150 pr_debug(KERN_WARNING "Privileged exception\n");
Michal Simek751f1602010-08-03 11:26:51 +0200151 /* "brk r0,r0" - used as debug breakpoint - old toolchain */
Michal Simek4bb73c32009-05-26 16:30:24 +0200152 if (get_user(code, (unsigned long *)regs->pc) == 0
153 && code == 0x980c0000) {
154 _exception(SIGTRAP, regs, TRAP_BRKPT, addr);
155 } else {
156 _exception(SIGILL, regs, ILL_PRVOPC, addr);
157 }
158 break;
159#endif
Michal Simekc4df4bc2009-03-27 14:25:13 +0100160 default:
Michal Simek4bb73c32009-05-26 16:30:24 +0200161 /* FIXME what to do in unexpected exception */
Michal Simekc4df4bc2009-03-27 14:25:13 +0100162 printk(KERN_WARNING "Unexpected exception %02x "
163 "PC=%08x in %s mode\n", type, (unsigned int) addr,
164 kernel_mode(regs) ? "kernel" : "user");
165 }
166 return;
167}