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Linux/arch/nios2/kernel/traps.c

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  1 /*
  2  * Hardware exception handling
  3  *
  4  * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
  5  * Copyright (C) 2004 Microtronix Datacom Ltd.
  6  * Copyright (C) 2001 Vic Phillips
  7  *
  8  * This file is subject to the terms and conditions of the GNU General
  9  * Public License.  See the file COPYING in the main directory of this
 10  * archive for more details.
 11  */
 12 
 13 #include <linux/sched.h>
 14 #include <linux/kernel.h>
 15 #include <linux/signal.h>
 16 #include <linux/export.h>
 17 #include <linux/mm.h>
 18 #include <linux/ptrace.h>
 19 
 20 #include <asm/traps.h>
 21 #include <asm/sections.h>
 22 #include <asm/uaccess.h>
 23 
 24 static DEFINE_SPINLOCK(die_lock);
 25 
 26 static void _send_sig(int signo, int code, unsigned long addr)
 27 {
 28         siginfo_t info;
 29 
 30         info.si_signo = signo;
 31         info.si_errno = 0;
 32         info.si_code = code;
 33         info.si_addr = (void __user *) addr;
 34         force_sig_info(signo, &info, current);
 35 }
 36 
 37 void die(const char *str, struct pt_regs *regs, long err)
 38 {
 39         console_verbose();
 40         spin_lock_irq(&die_lock);
 41         pr_warn("Oops: %s, sig: %ld\n", str, err);
 42         show_regs(regs);
 43         spin_unlock_irq(&die_lock);
 44         /*
 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 signo, struct pt_regs *regs, int code, unsigned long addr)
 52 {
 53         if (!user_mode(regs))
 54                 die("Exception in kernel mode", regs, signo);
 55 
 56         _send_sig(signo, code, addr);
 57 }
 58 
 59 /*
 60  * The show_stack is an external API which we do not use ourselves.
 61  */
 62 
 63 int kstack_depth_to_print = 48;
 64 
 65 void show_stack(struct task_struct *task, unsigned long *stack)
 66 {
 67         unsigned long *endstack, addr;
 68         int i;
 69 
 70         if (!stack) {
 71                 if (task)
 72                         stack = (unsigned long *)task->thread.ksp;
 73                 else
 74                         stack = (unsigned long *)&stack;
 75         }
 76 
 77         addr = (unsigned long) stack;
 78         endstack = (unsigned long *) PAGE_ALIGN(addr);
 79 
 80         pr_emerg("Stack from %08lx:", (unsigned long)stack);
 81         for (i = 0; i < kstack_depth_to_print; i++) {
 82                 if (stack + 1 > endstack)
 83                         break;
 84                 if (i % 8 == 0)
 85                         pr_emerg("\n       ");
 86                 pr_emerg(" %08lx", *stack++);
 87         }
 88 
 89         pr_emerg("\nCall Trace:");
 90         i = 0;
 91         while (stack + 1 <= endstack) {
 92                 addr = *stack++;
 93                 /*
 94                  * If the address is either in the text segment of the
 95                  * kernel, or in the region which contains vmalloc'ed
 96                  * memory, it *may* be the address of a calling
 97                  * routine; if so, print it so that someone tracing
 98                  * down the cause of the crash will be able to figure
 99                  * out the call path that was taken.
100                  */
101                 if (((addr >= (unsigned long) _stext) &&
102                      (addr <= (unsigned long) _etext))) {
103                         if (i % 4 == 0)
104                                 pr_emerg("\n       ");
105                         pr_emerg(" [<%08lx>]", addr);
106                         i++;
107                 }
108         }
109         pr_emerg("\n");
110 }
111 
112 void __init trap_init(void)
113 {
114         /* Nothing to do here */
115 }
116 
117 /* Breakpoint handler */
118 asmlinkage void breakpoint_c(struct pt_regs *fp)
119 {
120         /*
121          * The breakpoint entry code has moved the PC on by 4 bytes, so we must
122          * move it back. This could be done on the host but we do it here
123          * because monitor.S of JTAG gdbserver does it too.
124          */
125         fp->ea -= 4;
126         _exception(SIGTRAP, fp, TRAP_BRKPT, fp->ea);
127 }
128 
129 #ifndef CONFIG_NIOS2_ALIGNMENT_TRAP
130 /* Alignment exception handler */
131 asmlinkage void handle_unaligned_c(struct pt_regs *fp, int cause)
132 {
133         unsigned long addr = RDCTL(CTL_BADADDR);
134 
135         cause >>= 2;
136         fp->ea -= 4;
137 
138         if (fixup_exception(fp))
139                 return;
140 
141         if (!user_mode(fp)) {
142                 pr_alert("Unaligned access from kernel mode, this might be a hardware\n");
143                 pr_alert("problem, dump registers and restart the instruction\n");
144                 pr_alert("  BADADDR 0x%08lx\n", addr);
145                 pr_alert("  cause   %d\n", cause);
146                 pr_alert("  op-code 0x%08lx\n", *(unsigned long *)(fp->ea));
147                 show_regs(fp);
148                 return;
149         }
150 
151         _exception(SIGBUS, fp, BUS_ADRALN, addr);
152 }
153 #endif /* CONFIG_NIOS2_ALIGNMENT_TRAP */
154 
155 /* Illegal instruction handler */
156 asmlinkage void handle_illegal_c(struct pt_regs *fp)
157 {
158         fp->ea -= 4;
159         _exception(SIGILL, fp, ILL_ILLOPC, fp->ea);
160 }
161 
162 /* Supervisor instruction handler */
163 asmlinkage void handle_supervisor_instr(struct pt_regs *fp)
164 {
165         fp->ea -= 4;
166         _exception(SIGILL, fp, ILL_PRVOPC, fp->ea);
167 }
168 
169 /* Division error handler */
170 asmlinkage void handle_diverror_c(struct pt_regs *fp)
171 {
172         fp->ea -= 4;
173         _exception(SIGFPE, fp, FPE_INTDIV, fp->ea);
174 }
175 
176 /* Unhandled exception handler */
177 asmlinkage void unhandled_exception(struct pt_regs *regs, int cause)
178 {
179         unsigned long addr = RDCTL(CTL_BADADDR);
180 
181         cause /= 4;
182 
183         pr_emerg("Unhandled exception #%d in %s mode (badaddr=0x%08lx)\n",
184                         cause, user_mode(regs) ? "user" : "kernel", addr);
185 
186         regs->ea -= 4;
187         show_regs(regs);
188 
189         pr_emerg("opcode: 0x%08lx\n", *(unsigned long *)(regs->ea));
190 }
191 
192 asmlinkage void handle_trap_1_c(struct pt_regs *fp)
193 {
194         _send_sig(SIGUSR1, 0, fp->ea);
195 }
196 
197 asmlinkage void handle_trap_2_c(struct pt_regs *fp)
198 {
199         _send_sig(SIGUSR2, 0, fp->ea);
200 }
201 
202 asmlinkage void handle_trap_3_c(struct pt_regs *fp)
203 {
204         _send_sig(SIGILL, ILL_ILLTRP, fp->ea);
205 }
206 

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