help
This option allows you to set the stack depth that the kernel
prints in stack traces.
+
+config PRINT_USER_CODE_ON_UNHANDLED_EXCEPTION
+ bool "Dump user code around unhandled exception address"
+ help
+ Enable this option to display user code around PC of the unhandled
+ exception (starting at address aligned on 16 byte boundary).
+ This may simplify finding faulting code in the absence of other
+ debug facilities.
die(str, regs, err);
}
+#ifdef CONFIG_PRINT_USER_CODE_ON_UNHANDLED_EXCEPTION
+static inline void dump_user_code(struct pt_regs *regs)
+{
+ char buf[32];
+
+ if (copy_from_user(buf, (void __user *)(regs->pc & -16), sizeof(buf)) == 0) {
+ print_hex_dump(KERN_INFO, " ", DUMP_PREFIX_NONE,
+ 32, 1, buf, sizeof(buf), false);
+
+ }
+}
+#else
+static inline void dump_user_code(struct pt_regs *regs)
+{
+}
+#endif
+
/*
* Unhandled Exceptions. Kill user task or panic if in kernel space.
*/
"\tEXCCAUSE is %ld\n",
current->comm, task_pid_nr(current), regs->pc,
regs->exccause);
+ dump_user_code(regs);
force_sig(SIGILL);
}