| #include <linux/bug.h> | |
| #include <linux/io.h> | |
| #include <linux/types.h> | |
| #include <linux/kdebug.h> | |
| #include <linux/signal.h> | |
| #include <linux/sched.h> | |
| #include <linux/uaccess.h> | |
| #include <asm/system.h> | |
| #ifdef CONFIG_BUG | |
| static void handle_BUG(struct pt_regs *regs) | |
| { | |
| enum bug_trap_type tt; | |
| tt = report_bug(regs->pc, regs); | |
| if (tt == BUG_TRAP_TYPE_WARN) { | |
| regs->pc += instruction_size(regs->pc); | |
| return; | |
| } | |
| die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff); | |
| } | |
| int is_valid_bugaddr(unsigned long addr) | |
| { | |
| unsigned short opcode; | |
| if (addr < PAGE_OFFSET) | |
| return 0; | |
| if (probe_kernel_address((u16 *)addr, opcode)) | |
| return 0; | |
| return opcode == TRAPA_BUG_OPCODE; | |
| } | |
| #endif | |
| /* | |
| * Generic trap handler. | |
| */ | |
| BUILD_TRAP_HANDLER(debug) | |
| { | |
| TRAP_HANDLER_DECL; | |
| /* Rewind */ | |
| regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); | |
| if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff, | |
| SIGTRAP) == NOTIFY_STOP) | |
| return; | |
| force_sig(SIGTRAP, current); | |
| } | |
| /* | |
| * Special handler for BUG() traps. | |
| */ | |
| BUILD_TRAP_HANDLER(bug) | |
| { | |
| TRAP_HANDLER_DECL; | |
| /* Rewind */ | |
| regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); | |
| if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff, | |
| SIGTRAP) == NOTIFY_STOP) | |
| return; | |
| #ifdef CONFIG_BUG | |
| if (__kernel_text_address(instruction_pointer(regs))) { | |
| opcode_t insn = *(opcode_t *)instruction_pointer(regs); | |
| if (insn == TRAPA_BUG_OPCODE) | |
| handle_BUG(regs); | |
| } | |
| #endif | |
| force_sig(SIGTRAP, current); | |
| } |