[Qemu-devel] [PATCH] Fix jmp im on x86_64 when executing 32-bit code

[Alexander Graf]

When running grub-install (32-bit) on an x86_64 Linux system in qemu, it
hangs on a pagefault forever, because an integer overflow occurs on the
IP on "jmp im". This patch masks overflows for 32 bit IPs on a 64 bit
system, just like it is done for 16 bit IPs already.

Using this patch, x86_64 openSUSE installation works again.

Signed-off-by: Alexander Graf <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>


Index: target-i386/translate.c
===================================================================
--- target-i386/translate.c     (revision 5959)
+++ target-i386/translate.c     (working copy)
@@ -6165,6 +6165,8 @@
         tval += s->pc - s->cs_base;
         if (s->dflag == 0)
             tval &= 0xffff;
+       else if(!CODE64(s))
+            tval &= 0xffffffff;
         gen_jmp(s, tval);
         break;
     case 0xea: /* ljmp im */