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Linux/arch/microblaze/kernel/exceptions.c

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  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 */
 24 #include <linux/uaccess.h>
 25 #include <linux/errno.h>
 26 #include <linux/ptrace.h>
 27 #include <asm/current.h>
 28 #include <asm/cacheflush.h>
 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
 35 #define MICROBLAZE_PRIVILEGED_EXCEPTION 0x07
 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 
 52 /* for user application debugging */
 53 asmlinkage void sw_exception(struct pt_regs *regs)
 54 {
 55         _exception(SIGTRAP, regs, TRAP_BRKPT, regs->r16);
 56         flush_dcache_range(regs->r16, regs->r16 + 0x4);
 57         flush_icache_range(regs->r16, regs->r16 + 0x4);
 58 }
 59 
 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)) {
 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 {
 77 #ifdef CONFIG_MMU
 78         addr = regs->pc;
 79 #endif
 80 
 81 #if 0
 82         printk(KERN_WARNING "Exception %02x in %s mode, FSR=%08x PC=%08x " \
 83                                                         "ESR=%08x\n",
 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:
 90                 if (user_mode(regs)) {
 91                         pr_debug("Illegal opcode exception in user mode\n");
 92                         _exception(SIGILL, regs, ILL_ILLOPC, addr);
 93                         return;
 94                 }
 95                 printk(KERN_WARNING "Illegal opcode exception " \
 96                                                         "in kernel mode.\n");
 97                 die("opcode exception", regs, SIGBUS);
 98                 break;
 99         case MICROBLAZE_IBUS_EXCEPTION:
100                 if (user_mode(regs)) {
101                         pr_debug("Instruction bus error exception in user mode\n");
102                         _exception(SIGBUS, regs, BUS_ADRERR, addr);
103                         return;
104                 }
105                 printk(KERN_WARNING "Instruction bus error exception " \
106                                                         "in kernel mode.\n");
107                 die("bus exception", regs, SIGBUS);
108                 break;
109         case MICROBLAZE_DBUS_EXCEPTION:
110                 if (user_mode(regs)) {
111                         pr_debug("Data bus error exception in user mode\n");
112                         _exception(SIGBUS, regs, BUS_ADRERR, addr);
113                         return;
114                 }
115                 printk(KERN_WARNING "Data bus error exception " \
116                                                         "in kernel mode.\n");
117                 die("bus exception", regs, SIGBUS);
118                 break;
119         case MICROBLAZE_DIV_ZERO_EXCEPTION:
120                 if (user_mode(regs)) {
121                         pr_debug("Divide by zero exception in user mode\n");
122                         _exception(SIGFPE, regs, FPE_INTDIV, addr);
123                         return;
124                 }
125                 printk(KERN_WARNING "Divide by zero exception " \
126                                                         "in kernel mode.\n");
127                 die("Divide by zero exception", regs, SIGBUS);
128                 break;
129         case MICROBLAZE_FPU_EXCEPTION:
130                 pr_debug("FPU exception\n");
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 
146 #ifdef CONFIG_MMU
147         case MICROBLAZE_PRIVILEGED_EXCEPTION:
148                 pr_debug("Privileged exception\n");
149                 _exception(SIGILL, regs, ILL_PRVOPC, addr);
150                 break;
151 #endif
152         default:
153         /* FIXME what to do in unexpected exception */
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 }
160 

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