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* Add code to flush the ICache, which any self-respecting SMC must do

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* 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
This commit is contained in:
Misha Brukman 2003-11-21 23:48:54 +00:00
parent c282f5a380
commit a59f41fc6c
1 changed files with 8 additions and 5 deletions
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13
lib/Target/SparcV9/SparcV9CodeEmitter.cpp
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@ -380,18 +380,21 @@ void JITResolver::CompilationCallback() {
// 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