[Qemu-devel] Incorrect handling of PPC64 rldcl insn

[Torbjorn Granlund <tg@gmplib.org>]

I could finally make Debian GNU/Linux install and run under
qemu-system-ppc64.  I used Debian 7.0.0 and qemu from the main git repo,
updated a few days ago.

While Debian runs well and not too slowly, GMP fails badly under all
ABIs, and in many different ways.  I have isolated the first problem.

Test case:

#include <stdio.h>
int
main ()
{
  unsigned long r;
  asm ("rldcl\t%0, %1, %2, 0" : "=r" (r) : "r" (0xcafebabedeadbeeful), "r" (16));
  printf ("%lx\n", r);
  return 0;
}

Expected output:
babedeadbeefcafe

Output under qemu:
0

I have single stepped in gdb to determine that it is indeed rldcl that
misbehaves.

-- 
Torbjörn