[PATCH] Generic BUG for x86-64

[firefly-linux-kernel-4.4.55.git] / arch / x86_64 / kernel / traps.c

diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index a1641ffdffcf7bfa28b4d34d9eb36689dd52527e..b54ccc07f37944dba409ac9a27761c5d5e0ce848 100644 (file)
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -31,6 +31,7 @@
 #include <linux/kexec.h>
 #include <linux/unwind.h>
 #include <linux/uaccess.h>
+#include <linux/bug.h>
 
 #include <asm/system.h>
 #include <asm/io.h>
@@ -524,30 +525,15 @@ bad:
        printk("\n");
 }      
 
-void handle_BUG(struct pt_regs *regs)
-{ 
-       struct bug_frame f;
-       long len;
-       const char *prefix = "";
+int is_valid_bugaddr(unsigned long rip)
+{
+       unsigned short ud2;
 
-       if (user_mode(regs))
-               return; 
-       if (__copy_from_user(&f, (const void __user *) regs->rip,
-                            sizeof(struct bug_frame)))
-               return; 
-       if (f.filename >= 0 ||
-           f.ud2[0] != 0x0f || f.ud2[1] != 0x0b) 
-               return;
-       len = __strnlen_user((char *)(long)f.filename, PATH_MAX) - 1;
-       if (len < 0 || len >= PATH_MAX)
-               f.filename = (int)(long)"unmapped filename";
-       else if (len > 50) {
-               f.filename += len - 50;
-               prefix = "...";
-       }
-       printk("----------- [cut here ] --------- [please bite here ] ---------\n");
-       printk(KERN_ALERT "Kernel BUG at %s%.50s:%d\n", prefix, (char *)(long)f.filename, f.line);
-} 
+       if (__copy_from_user(&ud2, (const void __user *) rip, sizeof(ud2)))
+               return 0;
+
+       return ud2 == 0x0b0f;
+}
 
 #ifdef CONFIG_BUG
 void out_of_line_bug(void)
@@ -627,7 +613,9 @@ void die(const char * str, struct pt_regs * regs, long err)
 {
        unsigned long flags = oops_begin();
 
-       handle_BUG(regs);
+       if (!user_mode(regs))
+               report_bug(regs->rip);
+
        __die(str, regs, err);
        oops_end(flags);
        do_exit(SIGSEGV);