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> |
| 1e1030dc | 8 | #include <linux/hardirq.h> |
| e115f2c1 | 9 | #include <asm/unwinder.h> |
| 5a4f7c66 PM |
10 | #include <asm/system.h> |
| 11 | ||
| 12 | #ifdef CONFIG_BUG | |
| b344e24a | 13 | void handle_BUG(struct pt_regs *regs) |
| 5a4f7c66 | 14 | { |
| e115f2c1 PM |
15 | const struct bug_entry *bug; |
| 16 | unsigned long bugaddr = regs->pc; | |
| 5a4f7c66 | 17 | enum bug_trap_type tt; |
| e115f2c1 PM |
18 | |
| 19 | if (!is_valid_bugaddr(bugaddr)) | |
| 20 | goto invalid; | |
| 21 | ||
| 22 | bug = find_bug(bugaddr); | |
| 23 | ||
| 24 | /* Switch unwinders when unwind_stack() is called */ | |
| 25 | if (bug->flags & BUGFLAG_UNWINDER) | |
| 26 | unwinder_faulted = 1; | |
| 27 | ||
| 28 | tt = report_bug(bugaddr, regs); | |
| 5a4f7c66 | 29 | if (tt == BUG_TRAP_TYPE_WARN) { |
| e115f2c1 | 30 | regs->pc += instruction_size(bugaddr); |
| 5a4f7c66 PM |
31 | return; |
| 32 | } | |
| 33 | ||
| e115f2c1 | 34 | invalid: |
| 5a4f7c66 PM |
35 | die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff); |
| 36 | } | |
| 37 | ||
| 38 | int is_valid_bugaddr(unsigned long addr) | |
| 39 | { | |
| 2bcfffa4 | 40 | insn_size_t opcode; |
| 9a33fc21 PM |
41 | |
| 42 | if (addr < PAGE_OFFSET) | |
| 43 | return 0; | |
| 2bcfffa4 | 44 | if (probe_kernel_address((insn_size_t *)addr, opcode)) |
| 9a33fc21 | 45 | return 0; |
| e115f2c1 | 46 | if (opcode == TRAPA_BUG_OPCODE) |
| b344e24a MF |
47 | return 1; |
| 48 | ||
| 49 | return 0; | |
| 5a4f7c66 PM |
50 | } |
| 51 | #endif | |
| 52 | ||
| 53 | /* | |
| 54 | * Generic trap handler. | |
| 55 | */ | |
| 56 | BUILD_TRAP_HANDLER(debug) | |
| 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, "debug trap", regs, 0, vec & 0xff, | |
| 64 | SIGTRAP) == NOTIFY_STOP) | |
| 65 | return; | |
| 66 | ||
| 67 | force_sig(SIGTRAP, current); | |
| 68 | } | |
| 69 | ||
| 70 | /* | |
| 71 | * Special handler for BUG() traps. | |
| 72 | */ | |
| 73 | BUILD_TRAP_HANDLER(bug) | |
| 74 | { | |
| 75 | TRAP_HANDLER_DECL; | |
| 76 | ||
| 77 | /* Rewind */ | |
| 78 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); | |
| 79 | ||
| 80 | if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff, | |
| 81 | SIGTRAP) == NOTIFY_STOP) | |
| 82 | return; | |
| 83 | ||
| 84 | #ifdef CONFIG_BUG | |
| 85 | if (__kernel_text_address(instruction_pointer(regs))) { | |
| 2bcfffa4 | 86 | insn_size_t insn = *(insn_size_t *)instruction_pointer(regs); |
| 5a4f7c66 PM |
87 | if (insn == TRAPA_BUG_OPCODE) |
| 88 | handle_BUG(regs); | |
| 0ec39885 | 89 | return; |
| 5a4f7c66 PM |
90 | } |
| 91 | #endif | |
| 92 | ||
| 93 | force_sig(SIGTRAP, current); | |
| 94 | } | |
| 1e1030dc PM |
95 | |
| 96 | BUILD_TRAP_HANDLER(nmi) | |
| 97 | { | |
| 98 | TRAP_HANDLER_DECL; | |
| 99 | ||
| 100 | nmi_enter(); | |
| 101 | ||
| 102 | switch (notify_die(DIE_NMI, "NMI", regs, 0, vec & 0xff, SIGINT)) { | |
| 103 | case NOTIFY_OK: | |
| 104 | case NOTIFY_STOP: | |
| 105 | break; | |
| 106 | case NOTIFY_BAD: | |
| 107 | die("Fatal Non-Maskable Interrupt", regs, SIGINT); | |
| 108 | default: | |
| 109 | printk(KERN_ALERT "Got NMI, but nobody cared. Ignoring...\n"); | |
| 110 | break; | |
| 111 | } | |
| 112 | ||
| 113 | nmi_exit(); | |
| 114 | } |