projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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> |
| e115f2c1 | 8 | #include <asm/unwinder.h> |
| 5a4f7c66 PM |
9 | #include <asm/system.h> |
| 10 | ||
| 11 | #ifdef CONFIG_BUG | |
| b344e24a | 12 | void handle_BUG(struct pt_regs *regs) |
| 5a4f7c66 | 13 | { |
| e115f2c1 PM |
14 | const struct bug_entry *bug; |
| 15 | unsigned long bugaddr = regs->pc; | |
| 5a4f7c66 | 16 | enum bug_trap_type tt; |
| e115f2c1 PM |
17 | |
| 18 | if (!is_valid_bugaddr(bugaddr)) | |
| 19 | goto invalid; | |
| 20 | ||
| 21 | bug = find_bug(bugaddr); | |
| 22 | ||
| 23 | /* Switch unwinders when unwind_stack() is called */ | |
| 24 | if (bug->flags & BUGFLAG_UNWINDER) | |
| 25 | unwinder_faulted = 1; | |
| 26 | ||
| 27 | tt = report_bug(bugaddr, regs); | |
| 5a4f7c66 | 28 | if (tt == BUG_TRAP_TYPE_WARN) { |
| e115f2c1 | 29 | regs->pc += instruction_size(bugaddr); |
| 5a4f7c66 PM |
30 | return; |
| 31 | } | |
| 32 | ||
| e115f2c1 | 33 | invalid: |
| 5a4f7c66 PM |
34 | die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff); |
| 35 | } | |
| 36 | ||
| 37 | int is_valid_bugaddr(unsigned long addr) | |
| 38 | { | |
| 2bcfffa4 | 39 | insn_size_t opcode; |
| 9a33fc21 PM |
40 | |
| 41 | if (addr < PAGE_OFFSET) | |
| 42 | return 0; | |
| 2bcfffa4 | 43 | if (probe_kernel_address((insn_size_t *)addr, opcode)) |
| 9a33fc21 | 44 | return 0; |
| e115f2c1 | 45 | if (opcode == TRAPA_BUG_OPCODE) |
| b344e24a MF |
46 | return 1; |
| 47 | ||
| 48 | return 0; | |
| 5a4f7c66 PM |
49 | } |
| 50 | #endif | |
| 51 | ||
| 52 | /* | |
| 53 | * Generic trap handler. | |
| 54 | */ | |
| 55 | BUILD_TRAP_HANDLER(debug) | |
| 56 | { | |
| 57 | TRAP_HANDLER_DECL; | |
| 58 | ||
| 59 | /* Rewind */ | |
| 60 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); | |
| 61 | ||
| 62 | if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff, | |
| 63 | SIGTRAP) == NOTIFY_STOP) | |
| 64 | return; | |
| 65 | ||
| 66 | force_sig(SIGTRAP, current); | |
| 67 | } | |
| 68 | ||
| 69 | /* | |
| 70 | * Special handler for BUG() traps. | |
| 71 | */ | |
| 72 | BUILD_TRAP_HANDLER(bug) | |
| 73 | { | |
| 74 | TRAP_HANDLER_DECL; | |
| 75 | ||
| 76 | /* Rewind */ | |
| 77 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); | |
| 78 | ||
| 79 | if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff, | |
| 80 | SIGTRAP) == NOTIFY_STOP) | |
| 81 | return; | |
| 82 | ||
| 83 | #ifdef CONFIG_BUG | |
| 84 | if (__kernel_text_address(instruction_pointer(regs))) { | |
| 2bcfffa4 | 85 | insn_size_t insn = *(insn_size_t *)instruction_pointer(regs); |
| 5a4f7c66 PM |
86 | if (insn == TRAPA_BUG_OPCODE) |
| 87 | handle_BUG(regs); | |
| 0ec39885 | 88 | return; |
| 5a4f7c66 PM |
89 | } |
| 90 | #endif | |
| 91 | ||
| 92 | force_sig(SIGTRAP, current); | |
| 93 | } |