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