1 files changed, 165 insertions, 0 deletions
diff --git a/lib/Target/Sparc/SparcJITInfo.cpp b/lib/Target/Sparc/SparcJITInfo.cpp
new file mode 100644
index 0000000..6493c7d
--- /dev/null
+++ b/lib/Target/Sparc/SparcJITInfo.cpp
@@ -0,0 +1,165 @@
+//===-- SparcJITInfo.cpp - Implement the Sparc JIT Interface --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the JIT interfaces for the Sparc target.
+//
+//===----------------------------------------------------------------------===//
+#define DEBUG_TYPE "jit"
+#include "SparcJITInfo.h"
+#include "SparcRelocations.h"
+
+#include "llvm/CodeGen/JITCodeEmitter.h"
+#include "llvm/Support/Memory.h"
+
+using namespace llvm;
+
+/// JITCompilerFunction - This contains the address of the JIT function used to
+/// compile a function lazily.
+static TargetJITInfo::JITCompilerFn JITCompilerFunction;
+
+extern "C" void SparcCompilationCallback();
+
+extern "C" {
+#if defined (__sparc__)
+  asm(
+      ".text\n"
+      "\t.align 4\n"
+      "\t.global SparcCompilationCallback\n"
+      "\t.type SparcCompilationCallback, #function\n"
+      "SparcCompilationCallback:\n"
+      // Save current register window.
+      "\tsave %sp, -192, %sp\n"
+      // stubaddr+4 is in %g1.
+      "\tcall SparcCompilationCallbackC\n"
+      "\t  sub %g1, 4, %o0\n"
+      // restore original register window and
+      // copy %o0 to %g1
+      "\t  restore %o0, 0, %g1\n"
+      // call the new stub
+      "\tjmp %g1\n"
+      "\t  nop\n"
+      "\t.size   SparcCompilationCallback, .-SparcCompilationCallback"
+      );
+
+#else
+  void SparcCompilationCallback() {
+    llvm_unreachable(
+      "Cannot call SparcCompilationCallback() on a non-sparc arch!");
+  }
+#endif
+}
+
+#define HI(Val) (((unsigned)(Val)) >> 10)
+#define LO(Val) (((unsigned)(Val)) & 0x3FF)
+
+#define SETHI_INST(imm, rd)    (0x01000000 | ((rd) << 25) | ((imm) & 0x3FFFFF))
+#define JMP_INST(rs1, imm, rd) (0x80000000 | ((rd) << 25) | (0x38 << 19) \
+                                | ((rs1) << 14) | (1 << 13) | ((imm) & 0x1FFF))
+#define NOP_INST               SETHI_INST(0, 0)
+
+extern "C" void *SparcCompilationCallbackC(intptr_t StubAddr) {
+  // Get the address of the compiled code for this function.
+  intptr_t NewVal = (intptr_t) JITCompilerFunction((void*) StubAddr);
+
+  // Rewrite the function stub so that we don't end up here every time we
+  // execute the call. We're replacing the first three instructions of the
+  // stub with code that jumps to the compiled function:
+  //   sethi %hi(NewVal), %g1
+  //   jmp %g1+%lo(NewVal)
+  //   nop
+
+  *(intptr_t *)(StubAddr)      = SETHI_INST(HI(NewVal), 1);
+  *(intptr_t *)(StubAddr + 4)  = JMP_INST(1, LO(NewVal), 0);
+  *(intptr_t *)(StubAddr + 8)  = NOP_INST;
+
+  sys::Memory::InvalidateInstructionCache((void*) StubAddr, 12);
+  return (void*)StubAddr;
+}
+
+void SparcJITInfo::replaceMachineCodeForFunction(void *Old, void *New) {
+  assert(0 && "FIXME: Implement SparcJITInfo::replaceMachineCodeForFunction");
+}
+
+
+TargetJITInfo::StubLayout SparcJITInfo::getStubLayout() {
+  // The stub contains 3 4-byte instructions, aligned at 4 bytes. See
+  // emitFunctionStub for details.
+
+  StubLayout Result = { 3*4, 4 };
+  return Result;
+}
+
+void *SparcJITInfo::emitFunctionStub(const Function *F, void *Fn,
+                                     JITCodeEmitter &JCE)
+{
+  JCE.emitAlignment(4);
+  void *Addr = (void*) (JCE.getCurrentPCValue());
+  if (!sys::Memory::setRangeWritable(Addr, 12))
+    llvm_unreachable("ERROR: Unable to mark stub writable.");
+
+  intptr_t EmittedAddr;
+  if (Fn != (void*)(intptr_t)SparcCompilationCallback)
+    EmittedAddr = (intptr_t)Fn;
+  else
+    EmittedAddr = (intptr_t)SparcCompilationCallback;
+
+  // sethi %hi(EmittedAddr), %g1
+  // jmp   %g1+%lo(EmittedAddr), %g1
+  // nop
+
+  JCE.emitWordBE(SETHI_INST(HI(EmittedAddr), 1));
+  JCE.emitWordBE(JMP_INST(1, LO(EmittedAddr), 1));
+  JCE.emitWordBE(NOP_INST);
+
+  sys::Memory::InvalidateInstructionCache(Addr, 12);
+  if (!sys::Memory::setRangeExecutable(Addr, 12))
+    llvm_unreachable("ERROR: Unable to mark stub executable.");
+
+  return Addr;
+}
+
+TargetJITInfo::LazyResolverFn
+SparcJITInfo::getLazyResolverFunction(JITCompilerFn F) {
+  JITCompilerFunction = F;
+  return SparcCompilationCallback;
+}
+
+/// relocate - Before the JIT can run a block of code that has been emitted,
+/// it must rewrite the code to contain the actual addresses of any
+/// referenced global symbols.
+void SparcJITInfo::relocate(void *Function, MachineRelocation *MR,
+                            unsigned NumRelocs, unsigned char *GOTBase) {
+  for (unsigned i = 0; i != NumRelocs; ++i, ++MR) {
+    void *RelocPos = (char*) Function + MR->getMachineCodeOffset();
+    intptr_t ResultPtr = (intptr_t) MR->getResultPointer();
+
+    switch ((SP::RelocationType) MR->getRelocationType()) {
+    case SP::reloc_sparc_hi:
+      ResultPtr = (ResultPtr >> 10) & 0x3fffff;
+      break;
+
+    case SP::reloc_sparc_lo:
+      ResultPtr = (ResultPtr & 0x3ff);
+      break;
+
+    case SP::reloc_sparc_pc30:
+      ResultPtr = ((ResultPtr - (intptr_t)RelocPos) >> 2) & 0x3fffffff;
+      break;
+
+    case SP::reloc_sparc_pc22:
+      ResultPtr = ((ResultPtr - (intptr_t)RelocPos) >> 2) & 0x3fffff;
+      break;
+
+    case SP::reloc_sparc_pc19:
+      ResultPtr = ((ResultPtr - (intptr_t)RelocPos) >> 2) & 0x7ffff;
+      break;
+    }
+    *((unsigned*) RelocPos) |= (unsigned) ResultPtr;
+  }
+}