inline assembly problem in psim BSP

[jskulpin at eng01.gdds.com (Jay Kulpinski)]

In trying to run the timing tests on MPC604, I discovered a problem
with inline assembly code borrowed from the PowerPC psim BSP.

I haven't tried to run the timing tests under psim, but I'd guess
it would be a problem there, too.
-------------- next part --------------
*** ./rtems-4.0.0/c/src/lib/libbsp/powerpc/psim/include/bsp.h.orig	Wed Apr 15 16:50:22 1998
--- ./rtems-4.0.0/c/src/lib/libbsp/powerpc/psim/include/bsp.h	Mon Feb  8 15:52:05 1999
***************
*** 72,94 ****
  #define Cause_tm27_intr()  \
    do { \
      unsigned32 _clicks = 1; \
!     asm volatile( "mtdec %0" : "=r" ((_clicks)) : "r" ((_clicks)) ); \
    } while (0)
  
  
  #define Clear_tm27_intr() \
    do { \
      unsigned32 _clicks = 0xffffffff; \
!     asm volatile( "mtdec %0" : "=r" ((_clicks)) : "r" ((_clicks)) ); \
    } while (0)
  
  #define Lower_tm27_intr() \
    do { \
      unsigned32 _msr = 0; \
      _ISR_Set_level( 0 ); \
!     asm volatile( "mfmsr %0 ;" : "=r" (_msr) : "r" (_msr) ); \
      _msr |=  0x8002; \
!     asm volatile( "mtmsr %0 ;" : "=r" (_msr) : "r" (_msr) ); \
    } while (0)
  
  /* Constants */
--- 72,94 ----
  #define Cause_tm27_intr()  \
    do { \
      unsigned32 _clicks = 1; \
!     asm volatile( "mtdec %0" : : "r" ((_clicks)) ); \
    } while (0)
  
  
  #define Clear_tm27_intr() \
    do { \
      unsigned32 _clicks = 0xffffffff; \
!     asm volatile( "mtdec %0" : : "r" ((_clicks)) ); \
    } while (0)
  
  #define Lower_tm27_intr() \
    do { \
      unsigned32 _msr = 0; \
      _ISR_Set_level( 0 ); \
!     asm volatile( "mfmsr %0 ;" : "=r" (_msr) : ); \
      _msr |=  0x8002; \
!     asm volatile( "mtmsr %0 ;" : : "r" (_msr) ); \
    } while (0)
  
  /* Constants */