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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 | |
b344e24a | 11 | void handle_BUG(struct pt_regs *regs) |
5a4f7c66 PM |
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 | { | |
2bcfffa4 | 25 | insn_size_t opcode; |
9a33fc21 PM |
26 | |
27 | if (addr < PAGE_OFFSET) | |
28 | return 0; | |
2bcfffa4 | 29 | if (probe_kernel_address((insn_size_t *)addr, opcode)) |
9a33fc21 PM |
30 | return 0; |
31 | ||
b344e24a MF |
32 | if (opcode == TRAPA_BUG_OPCODE || opcode == TRAPA_UNWINDER_BUG_OPCODE) |
33 | return 1; | |
34 | ||
35 | return 0; | |
5a4f7c66 PM |
36 | } |
37 | #endif | |
38 | ||
39 | /* | |
40 | * Generic trap handler. | |
41 | */ | |
42 | BUILD_TRAP_HANDLER(debug) | |
43 | { | |
44 | TRAP_HANDLER_DECL; | |
45 | ||
46 | /* Rewind */ | |
47 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); | |
48 | ||
49 | if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff, | |
50 | SIGTRAP) == NOTIFY_STOP) | |
51 | return; | |
52 | ||
53 | force_sig(SIGTRAP, current); | |
54 | } | |
55 | ||
56 | /* | |
57 | * Special handler for BUG() traps. | |
58 | */ | |
59 | BUILD_TRAP_HANDLER(bug) | |
60 | { | |
61 | TRAP_HANDLER_DECL; | |
62 | ||
63 | /* Rewind */ | |
64 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); | |
65 | ||
66 | if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff, | |
67 | SIGTRAP) == NOTIFY_STOP) | |
68 | return; | |
69 | ||
70 | #ifdef CONFIG_BUG | |
71 | if (__kernel_text_address(instruction_pointer(regs))) { | |
2bcfffa4 | 72 | insn_size_t insn = *(insn_size_t *)instruction_pointer(regs); |
5a4f7c66 PM |
73 | if (insn == TRAPA_BUG_OPCODE) |
74 | handle_BUG(regs); | |
0ec39885 | 75 | return; |
5a4f7c66 PM |
76 | } |
77 | #endif | |
78 | ||
79 | force_sig(SIGTRAP, current); | |
80 | } |