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5a4f7c66 PM |
1 | #include <linux/bug.h> |
2 | #include <linux/io.h> | |
3 | #include <linux/types.h> | |
4 | #include <linux/kdebug.h> | |
47a3eb95 PM |
5 | #include <linux/signal.h> |
6 | #include <linux/sched.h> | |
9a33fc21 | 7 | #include <linux/uaccess.h> |
5a4f7c66 PM |
8 | #include <asm/system.h> |
9 | ||
10 | #ifdef CONFIG_BUG | |
11 | static void handle_BUG(struct pt_regs *regs) | |
12 | { | |
13 | enum bug_trap_type tt; | |
14 | tt = report_bug(regs->pc, regs); | |
15 | if (tt == BUG_TRAP_TYPE_WARN) { | |
16 | regs->pc += instruction_size(regs->pc); | |
17 | return; | |
18 | } | |
19 | ||
20 | die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff); | |
21 | } | |
22 | ||
23 | int is_valid_bugaddr(unsigned long addr) | |
24 | { | |
9a33fc21 PM |
25 | unsigned short opcode; |
26 | ||
27 | if (addr < PAGE_OFFSET) | |
28 | return 0; | |
29 | if (probe_kernel_address((u16 *)addr, opcode)) | |
30 | return 0; | |
31 | ||
32 | return opcode == TRAPA_BUG_OPCODE; | |
5a4f7c66 PM |
33 | } |
34 | #endif | |
35 | ||
36 | /* | |
37 | * Generic trap handler. | |
38 | */ | |
39 | BUILD_TRAP_HANDLER(debug) | |
40 | { | |
41 | TRAP_HANDLER_DECL; | |
42 | ||
43 | /* Rewind */ | |
44 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); | |
45 | ||
46 | if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff, | |
47 | SIGTRAP) == NOTIFY_STOP) | |
48 | return; | |
49 | ||
50 | force_sig(SIGTRAP, current); | |
51 | } | |
52 | ||
53 | /* | |
54 | * Special handler for BUG() traps. | |
55 | */ | |
56 | BUILD_TRAP_HANDLER(bug) | |
57 | { | |
58 | TRAP_HANDLER_DECL; | |
59 | ||
60 | /* Rewind */ | |
61 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); | |
62 | ||
63 | if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff, | |
64 | SIGTRAP) == NOTIFY_STOP) | |
65 | return; | |
66 | ||
67 | #ifdef CONFIG_BUG | |
68 | if (__kernel_text_address(instruction_pointer(regs))) { | |
69 | opcode_t insn = *(opcode_t *)instruction_pointer(regs); | |
70 | if (insn == TRAPA_BUG_OPCODE) | |
71 | handle_BUG(regs); | |
72 | } | |
73 | #endif | |
74 | ||
75 | force_sig(SIGTRAP, current); | |
76 | } |