blob: 478f2943ede77d3e5b6a507e6bec662dd7f1424c [file] [log] [blame]
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
Michal Simek4bb73c32009-05-26 16:30:24 +020075 addr = regs->pc;
76#endif
77
Michal Simekc4df4bc2009-03-27 14:25:13 +010078#if 0
Michal Simekbfc32ad2009-09-15 09:49:53 +020079 printk(KERN_WARNING "Exception %02x in %s mode, FSR=%08x PC=%08x " \
80 "ESR=%08x\n",
Michal Simekc4df4bc2009-03-27 14:25:13 +010081 type, user_mode(regs) ? "user" : "kernel", fsr,
82 (unsigned int) regs->pc, (unsigned int) regs->esr);
83#endif
84
85 switch (type & 0x1F) {
86 case MICROBLAZE_ILL_OPCODE_EXCEPTION:
Michal Simek4bb73c32009-05-26 16:30:24 +020087 if (user_mode(regs)) {
Joe Perchesc4554c32010-09-11 22:10:51 -070088 pr_debug("Illegal opcode exception in user mode\n");
Michal Simek4bb73c32009-05-26 16:30:24 +020089 _exception(SIGILL, regs, ILL_ILLOPC, addr);
90 return;
91 }
Michal Simekbfc32ad2009-09-15 09:49:53 +020092 printk(KERN_WARNING "Illegal opcode exception " \
93 "in kernel mode.\n");
Michal Simek4bb73c32009-05-26 16:30:24 +020094 die("opcode exception", regs, SIGBUS);
Michal Simekc4df4bc2009-03-27 14:25:13 +010095 break;
96 case MICROBLAZE_IBUS_EXCEPTION:
97 if (user_mode(regs)) {
Joe Perchesc4554c32010-09-11 22:10:51 -070098 pr_debug("Instruction bus error exception in user mode\n");
Michal Simekc4df4bc2009-03-27 14:25:13 +010099 _exception(SIGBUS, regs, BUS_ADRERR, addr);
100 return;
101 }
Michal Simekbfc32ad2009-09-15 09:49:53 +0200102 printk(KERN_WARNING "Instruction bus error exception " \
103 "in kernel mode.\n");
Michal Simekc4df4bc2009-03-27 14:25:13 +0100104 die("bus exception", regs, SIGBUS);
105 break;
106 case MICROBLAZE_DBUS_EXCEPTION:
107 if (user_mode(regs)) {
Joe Perchesc4554c32010-09-11 22:10:51 -0700108 pr_debug("Data bus error exception in user mode\n");
Michal Simekc4df4bc2009-03-27 14:25:13 +0100109 _exception(SIGBUS, regs, BUS_ADRERR, addr);
110 return;
111 }
Michal Simekbfc32ad2009-09-15 09:49:53 +0200112 printk(KERN_WARNING "Data bus error exception " \
113 "in kernel mode.\n");
Michal Simekc4df4bc2009-03-27 14:25:13 +0100114 die("bus exception", regs, SIGBUS);
115 break;
116 case MICROBLAZE_DIV_ZERO_EXCEPTION:
Michal Simek4bb73c32009-05-26 16:30:24 +0200117 if (user_mode(regs)) {
Joe Perchesc4554c32010-09-11 22:10:51 -0700118 pr_debug("Divide by zero exception in user mode\n");
Michal Simek23902d92009-09-22 08:58:47 +0200119 _exception(SIGILL, regs, FPE_INTDIV, addr);
Michal Simek4bb73c32009-05-26 16:30:24 +0200120 return;
121 }
Michal Simekbfc32ad2009-09-15 09:49:53 +0200122 printk(KERN_WARNING "Divide by zero exception " \
123 "in kernel mode.\n");
Randy Dunlapf3ff8212010-04-21 14:11:34 -0700124 die("Divide by zero exception", regs, SIGBUS);
Michal Simekc4df4bc2009-03-27 14:25:13 +0100125 break;
Michal Simekc4df4bc2009-03-27 14:25:13 +0100126 case MICROBLAZE_FPU_EXCEPTION:
Joe Perchesc4554c32010-09-11 22:10:51 -0700127 pr_debug("FPU exception\n");
Michal Simekc4df4bc2009-03-27 14:25:13 +0100128 /* IEEE FP exception */
129 /* I removed fsr variable and use code var for storing fsr */
130 if (fsr & FSR_IO)
131 fsr = FPE_FLTINV;
132 else if (fsr & FSR_OF)
133 fsr = FPE_FLTOVF;
134 else if (fsr & FSR_UF)
135 fsr = FPE_FLTUND;
136 else if (fsr & FSR_DZ)
137 fsr = FPE_FLTDIV;
138 else if (fsr & FSR_DO)
139 fsr = FPE_FLTRES;
140 _exception(SIGFPE, regs, fsr, addr);
141 break;
142
Michal Simek4bb73c32009-05-26 16:30:24 +0200143#ifdef CONFIG_MMU
144 case MICROBLAZE_PRIVILEGED_EXCEPTION:
Joe Perchesc4554c32010-09-11 22:10:51 -0700145 pr_debug("Privileged exception\n");
Michal Simek04256092010-08-03 11:32:20 +0200146 _exception(SIGILL, regs, ILL_PRVOPC, addr);
Michal Simek4bb73c32009-05-26 16:30:24 +0200147 break;
148#endif
Michal Simekc4df4bc2009-03-27 14:25:13 +0100149 default:
Michal Simek4bb73c32009-05-26 16:30:24 +0200150 /* FIXME what to do in unexpected exception */
Michal Simekc4df4bc2009-03-27 14:25:13 +0100151 printk(KERN_WARNING "Unexpected exception %02x "
152 "PC=%08x in %s mode\n", type, (unsigned int) addr,
153 kernel_mode(regs) ? "kernel" : "user");
154 }
155 return;
156}