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c4df4bc1 MS |
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 */ | |
4bb73c3d MS |
24 | #include <linux/uaccess.h> |
25 | #include <linux/errno.h> | |
26 | #include <linux/ptrace.h> | |
c4df4bc1 MS |
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 | |
4bb73c3d | 34 | #define MICROBLAZE_PRIVILEGED_EXCEPTION 0x07 |
c4df4bc1 MS |
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 | { | |
4bb73c3d MS |
69 | #ifdef CONFIG_MMU |
70 | int code; | |
71 | addr = regs->pc; | |
72 | #endif | |
73 | ||
c4df4bc1 | 74 | #if 0 |
bfc32ad0 MS |
75 | printk(KERN_WARNING "Exception %02x in %s mode, FSR=%08x PC=%08x " \ |
76 | "ESR=%08x\n", | |
c4df4bc1 MS |
77 | type, user_mode(regs) ? "user" : "kernel", fsr, |
78 | (unsigned int) regs->pc, (unsigned int) regs->esr); | |
79 | #endif | |
80 | ||
81 | switch (type & 0x1F) { | |
82 | case MICROBLAZE_ILL_OPCODE_EXCEPTION: | |
4bb73c3d | 83 | if (user_mode(regs)) { |
bfc32ad0 MS |
84 | pr_debug(KERN_WARNING "Illegal opcode exception " \ |
85 | "in user mode.\n"); | |
4bb73c3d MS |
86 | _exception(SIGILL, regs, ILL_ILLOPC, addr); |
87 | return; | |
88 | } | |
bfc32ad0 MS |
89 | printk(KERN_WARNING "Illegal opcode exception " \ |
90 | "in kernel mode.\n"); | |
4bb73c3d | 91 | die("opcode exception", regs, SIGBUS); |
c4df4bc1 MS |
92 | break; |
93 | case MICROBLAZE_IBUS_EXCEPTION: | |
94 | if (user_mode(regs)) { | |
bfc32ad0 MS |
95 | pr_debug(KERN_WARNING "Instruction bus error " \ |
96 | "exception in user mode.\n"); | |
c4df4bc1 MS |
97 | _exception(SIGBUS, regs, BUS_ADRERR, addr); |
98 | return; | |
99 | } | |
bfc32ad0 MS |
100 | printk(KERN_WARNING "Instruction bus error exception " \ |
101 | "in kernel mode.\n"); | |
c4df4bc1 MS |
102 | die("bus exception", regs, SIGBUS); |
103 | break; | |
104 | case MICROBLAZE_DBUS_EXCEPTION: | |
105 | if (user_mode(regs)) { | |
bfc32ad0 MS |
106 | pr_debug(KERN_WARNING "Data bus error exception " \ |
107 | "in user mode.\n"); | |
c4df4bc1 MS |
108 | _exception(SIGBUS, regs, BUS_ADRERR, addr); |
109 | return; | |
110 | } | |
bfc32ad0 MS |
111 | printk(KERN_WARNING "Data bus error exception " \ |
112 | "in kernel mode.\n"); | |
c4df4bc1 MS |
113 | die("bus exception", regs, SIGBUS); |
114 | break; | |
115 | case MICROBLAZE_DIV_ZERO_EXCEPTION: | |
4bb73c3d | 116 | if (user_mode(regs)) { |
bfc32ad0 MS |
117 | pr_debug(KERN_WARNING "Divide by zero exception " \ |
118 | "in user mode\n"); | |
23902d95 | 119 | _exception(SIGILL, regs, FPE_INTDIV, addr); |
4bb73c3d MS |
120 | return; |
121 | } | |
bfc32ad0 MS |
122 | printk(KERN_WARNING "Divide by zero exception " \ |
123 | "in kernel mode.\n"); | |
4bb73c3d | 124 | die("Divide by exception", regs, SIGBUS); |
c4df4bc1 | 125 | break; |
c4df4bc1 | 126 | case MICROBLAZE_FPU_EXCEPTION: |
bfc32ad0 | 127 | pr_debug(KERN_WARNING "FPU exception\n"); |
c4df4bc1 MS |
128 | /* 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 | ||
4bb73c3d MS |
143 | #ifdef CONFIG_MMU |
144 | case MICROBLAZE_PRIVILEGED_EXCEPTION: | |
bfc32ad0 | 145 | pr_debug(KERN_WARNING "Privileged exception\n"); |
4bb73c3d MS |
146 | /* "brk r0,r0" - used as debug breakpoint */ |
147 | if (get_user(code, (unsigned long *)regs->pc) == 0 | |
148 | && code == 0x980c0000) { | |
149 | _exception(SIGTRAP, regs, TRAP_BRKPT, addr); | |
150 | } else { | |
151 | _exception(SIGILL, regs, ILL_PRVOPC, addr); | |
152 | } | |
153 | break; | |
154 | #endif | |
c4df4bc1 | 155 | default: |
4bb73c3d | 156 | /* FIXME what to do in unexpected exception */ |
c4df4bc1 MS |
157 | printk(KERN_WARNING "Unexpected exception %02x " |
158 | "PC=%08x in %s mode\n", type, (unsigned int) addr, | |
159 | kernel_mode(regs) ? "kernel" : "user"); | |
160 | } | |
161 | return; | |
162 | } |