Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-2.6
[sfrench/cifs-2.6.git] / arch / cris / arch-v32 / kernel / traps.c
1 /*
2  * Copyright (C) 2003-2006, Axis Communications AB.
3  */
4
5 #include <linux/ptrace.h>
6 #include <linux/module.h>
7 #include <asm/uaccess.h>
8 #include <hwregs/supp_reg.h>
9 #include <hwregs/intr_vect_defs.h>
10 #include <asm/irq.h>
11
12 void
13 show_registers(struct pt_regs *regs)
14 {
15         /*
16          * It's possible to use either the USP register or current->thread.usp.
17          * USP might not correspond to the current process for all cases this
18          * function is called, and current->thread.usp isn't up to date for the
19          * current process. Experience shows that using USP is the way to go.
20          */
21         unsigned long usp = rdusp();
22         unsigned long d_mmu_cause;
23         unsigned long i_mmu_cause;
24
25         printk("CPU: %d\n", smp_processor_id());
26
27         printk("ERP: %08lx SRP: %08lx  CCS: %08lx USP: %08lx MOF: %08lx\n",
28                regs->erp, regs->srp, regs->ccs, usp, regs->mof);
29
30         printk(" r0: %08lx  r1: %08lx   r2: %08lx  r3: %08lx\n",
31                regs->r0, regs->r1, regs->r2, regs->r3);
32
33         printk(" r4: %08lx  r5: %08lx   r6: %08lx  r7: %08lx\n",
34                regs->r4, regs->r5, regs->r6, regs->r7);
35
36         printk(" r8: %08lx  r9: %08lx  r10: %08lx r11: %08lx\n",
37                regs->r8, regs->r9, regs->r10, regs->r11);
38
39         printk("r12: %08lx r13: %08lx oR10: %08lx acr: %08lx\n",
40                regs->r12, regs->r13, regs->orig_r10, regs->acr);
41
42         printk(" sp: %08lx\n", (unsigned long)regs);
43
44         SUPP_BANK_SEL(BANK_IM);
45         SUPP_REG_RD(RW_MM_CAUSE, i_mmu_cause);
46
47         SUPP_BANK_SEL(BANK_DM);
48         SUPP_REG_RD(RW_MM_CAUSE, d_mmu_cause);
49
50         printk("       Data MMU Cause: %08lx\n", d_mmu_cause);
51         printk("Instruction MMU Cause: %08lx\n", i_mmu_cause);
52
53         printk("Process %s (pid: %d, stackpage=%08lx)\n",
54                current->comm, current->pid, (unsigned long)current);
55
56         /*
57          * When in-kernel, we also print out the stack and code at the
58          * time of the fault..
59          */
60         if (!user_mode(regs)) {
61                 int i;
62
63                 show_stack(NULL, (unsigned long *)usp);
64
65                 /*
66                  * If the previous stack-dump wasn't a kernel one, dump the
67                  * kernel stack now.
68                  */
69                 if (usp != 0)
70                         show_stack(NULL, NULL);
71
72                 printk("\nCode: ");
73
74                 if (regs->erp < PAGE_OFFSET)
75                         goto bad_value;
76
77                 /*
78                  * Quite often the value at regs->erp doesn't point to the
79                  * interesting instruction, which often is the previous
80                  * instruction. So dump at an offset large enough that the
81                  * instruction decoding should be in sync at the interesting
82                  * point, but small enough to fit on a row. The regs->erp
83                  * location is pointed out in a ksymoops-friendly way by
84                  * wrapping the byte for that address in parenthesises.
85                  */
86                 for (i = -12; i < 12; i++) {
87                         unsigned char c;
88
89                         if (__get_user(c, &((unsigned char *)regs->erp)[i])) {
90 bad_value:
91                                 printk(" Bad IP value.");
92                                 break;
93                         }
94
95                         if (i == 0)
96                                 printk("(%02x) ", c);
97                         else
98                                 printk("%02x ", c);
99                 }
100                 printk("\n");
101         }
102 }
103
104 void
105 arch_enable_nmi(void)
106 {
107         unsigned long flags;
108
109         local_save_flags(flags);
110         flags |= (1 << 30); /* NMI M flag is at bit 30 */
111         local_irq_restore(flags);
112 }
113
114 extern void (*nmi_handler)(struct pt_regs *);
115 void handle_nmi(struct pt_regs *regs)
116 {
117 #ifdef CONFIG_ETRAXFS
118         reg_intr_vect_r_nmi r;
119 #endif
120
121         if (nmi_handler)
122                 nmi_handler(regs);
123
124 #ifdef CONFIG_ETRAXFS
125         /* Wait until nmi is no longer active. */
126         do {
127                 r = REG_RD(intr_vect, regi_irq, r_nmi);
128         } while (r.ext == regk_intr_vect_on);
129 #endif
130 }
131
132
133 #ifdef CONFIG_BUG
134 extern void die_if_kernel(const char *str, struct pt_regs *regs, long err);
135
136 /* Copy of the regs at BUG() time.  */
137 struct pt_regs BUG_regs;
138
139 void do_BUG(char *file, unsigned int line)
140 {
141         printk("kernel BUG at %s:%d!\n", file, line);
142         die_if_kernel("Oops", &BUG_regs, 0);
143 }
144 EXPORT_SYMBOL(do_BUG);
145
146 void fixup_BUG(struct pt_regs *regs)
147 {
148         BUG_regs = *regs;
149
150 #ifdef CONFIG_DEBUG_BUGVERBOSE
151         /*
152          * Fixup the BUG arguments through exception handlers.
153          */
154         {
155                 const struct exception_table_entry *fixup;
156
157                 /*
158                  * ERP points at the "break 14" + 2, compensate for the 2
159                  * bytes.
160                  */
161                 fixup = search_exception_tables(instruction_pointer(regs) - 2);
162                 if (fixup) {
163                         /* Adjust the instruction pointer in the stackframe. */
164                         instruction_pointer(regs) = fixup->fixup;
165                         arch_fixup(regs);
166                 }
167         }
168 #else
169         /* Dont try to lookup the filename + line, just dump regs.  */
170         do_BUG("unknown", 0);
171 #endif
172 }
173
174 /*
175  * Break 14 handler. Save regs and jump into the fixup_BUG.
176  */
177 __asm__  ( ".text\n\t"
178            ".global breakh_BUG\n\t"
179            "breakh_BUG:\n\t"
180            SAVE_ALL
181            KGDB_FIXUP
182            "move.d $sp, $r10\n\t"
183            "jsr fixup_BUG\n\t"
184            "nop\n\t"
185            "jump ret_from_intr\n\t"
186            "nop\n\t");
187
188
189 #ifdef CONFIG_DEBUG_BUGVERBOSE
190 void
191 handle_BUG(struct pt_regs *regs)
192 {
193 }
194 #endif
195 #endif