src/os_cpu/solaris_sparc/vm/solaris_sparc.s

rev 4810 : 8016697: PPC64 (part 5): Use stubs to implement safefetch
Summary: Implement Safefetch as stub routines. This reduces compiler and os dependencies.
Reviewed-by: twisti, kvn

*** 19,69 ****
  !! Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  !! or visit www.oracle.com if you need additional information or have any
  !! questions.
  !!
  
-     !! Prototype: int SafeFetch32 (int * adr, int ErrValue)
-     !! The "ld" at Fetch32 is potentially faulting instruction.
-     !! If the instruction traps the trap handler will arrange
-     !! for control to resume at Fetch32Resume.  
-     !! By convention with the trap handler we ensure there is a non-CTI
-     !! instruction in the trap shadow.  
-     !!
-     !! The reader might be tempted to move this service to .il.
-     !! Don't.  Sun's CC back-end reads and optimize code emitted 
-     !! by the .il "call", in some cases optimizing the code, completely eliding it,
-     !! or by moving the code from the "call site". 
-         
-      !! ASM better know we may use G6 for our own purposes
-     .register %g6, #ignore
-         
-     .globl  SafeFetch32
-     .align  32
-     .global Fetch32PFI, Fetch32Resume 
- SafeFetch32:
-     mov     %o0, %g1
-     mov     %o1, %o0
- Fetch32PFI:
-     ld      [%g1], %o0          !! <-- Potentially faulting instruction
- Fetch32Resume:
-     nop
-     retl
-     nop
- 
-     .globl  SafeFetchN
-     .align  32
-     .globl  FetchNPFI, FetchNResume
- SafeFetchN:
-     mov     %o0, %g1
-     mov     %o1, %o0
- FetchNPFI:
-     ldn     [%g1], %o0
- FetchNResume:
-     nop
-     retl
-     nop
- 
      !! Possibilities:
      !! -- membar
      !! -- CAS (SP + BIAS, G0, G0)
      !! -- wr %g0, %asi
  
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