Merge git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq
[linux-2.6] / arch / sh / kernel / traps.c
1 #include <linux/bug.h>
2 #include <linux/io.h>
3 #include <linux/types.h>
4 #include <linux/kdebug.h>
5 #include <linux/signal.h>
6 #include <linux/sched.h>
7 #include <asm/system.h>
8
9 #ifdef CONFIG_BUG
10 static void handle_BUG(struct pt_regs *regs)
11 {
12         enum bug_trap_type tt;
13         tt = report_bug(regs->pc, regs);
14         if (tt == BUG_TRAP_TYPE_WARN) {
15                 regs->pc += instruction_size(regs->pc);
16                 return;
17         }
18
19         die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff);
20 }
21
22 int is_valid_bugaddr(unsigned long addr)
23 {
24         return addr >= PAGE_OFFSET;
25 }
26 #endif
27
28 /*
29  * Generic trap handler.
30  */
31 BUILD_TRAP_HANDLER(debug)
32 {
33         TRAP_HANDLER_DECL;
34
35         /* Rewind */
36         regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
37
38         if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff,
39                        SIGTRAP) == NOTIFY_STOP)
40                 return;
41
42         force_sig(SIGTRAP, current);
43 }
44
45 /*
46  * Special handler for BUG() traps.
47  */
48 BUILD_TRAP_HANDLER(bug)
49 {
50         TRAP_HANDLER_DECL;
51
52         /* Rewind */
53         regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
54
55         if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff,
56                        SIGTRAP) == NOTIFY_STOP)
57                 return;
58
59 #ifdef CONFIG_BUG
60         if (__kernel_text_address(instruction_pointer(regs))) {
61                 opcode_t insn = *(opcode_t *)instruction_pointer(regs);
62                 if (insn == TRAPA_BUG_OPCODE)
63                         handle_BUG(regs);
64         }
65 #endif
66
67         force_sig(SIGTRAP, current);
68 }