* Add code to flush the ICache, which any self-respecting SMC must do
* Restore registers *after* everything else to avoid any possible side effects
This fixes McCat-imp.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10147 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/SparcV9/SparcV9CodeEmitter.cpp b/lib/Target/SparcV9/SparcV9CodeEmitter.cpp
index f56e7f3..be677e0 100644
--- a/lib/Target/SparcV9/SparcV9CodeEmitter.cpp
+++ b/lib/Target/SparcV9/SparcV9CodeEmitter.cpp
@@ -380,18 +380,21 @@
// Overwrite it
TheJITResolver->insertJumpAtAddr(Target, CodeBegin);
- RestoreRegisters(DoubleFP, FSR, FPRS, CCR);
+ // Flush the I-Cache: FLUSH clears out a doubleword at a given address
+ // Self-modifying code MUST clear out the I-Cache to be portable
+#if defined(sparc) || defined(__sparc__) || defined(__sparcv9)
+ for (int i = -Offset, e = 32-((int64_t)Offset); i < e; i += 8)
+ __asm__ __volatile__ ("flush %%i7 + %0" : : "r" (i));
+#endif
// Change the return address to re-execute the restore, then the jump.
- // However, we can't just modify %i7 here, because we return to the function
- // that will restore the floating-point registers for us. Thus, we just return
- // the value we want it to be, and the parent will take care of setting %i7
- // correctly.
DEBUG(std::cerr << "Callback returning to: 0x"
<< std::hex << (CameFrom-Offset-12) << "\n");
#if defined(sparc) || defined(__sparc__) || defined(__sparcv9)
__asm__ __volatile__ ("sub %%i7, %0, %%i7" : : "r" (Offset+12));
#endif
+
+ RestoreRegisters(DoubleFP, FSR, FPRS, CCR);
}
/// emitStubForFunction - This method is used by the JIT when it needs to emit