#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) { insn_size_t opcode; if (addr < PAGE_OFFSET) return 0; if (probe_kernel_address((insn_size_t *)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))) { insn_size_t insn = *(insn_size_t *)instruction_pointer(regs); if (insn == TRAPA_BUG_OPCODE) handle_BUG(regs); return; } #endif force_sig(SIGTRAP, current); }