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https://github.com/c64scene-ar/llvm-6502.git
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Stefanovic. I removed the part that actually emits the instructions cause I want that to get in better shape first and in incremental steps. This also makes it easier to review the upcoming parts. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135678 91177308-0d34-0410-b5e6-96231b3b80d8
196 lines
5.7 KiB
C++
196 lines
5.7 KiB
C++
//===- MipsJITInfo.cpp - Implement the JIT interfaces for the Mips target -===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the JIT interfaces for the Mips target.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "jit"
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#include "MipsJITInfo.h"
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#include "MipsInstrInfo.h"
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#include "MipsRelocations.h"
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#include "MipsSubtarget.h"
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#include "llvm/Function.h"
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#include "llvm/CodeGen/JITCodeEmitter.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/Memory.h"
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#include <cstdlib>
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using namespace llvm;
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void MipsJITInfo::replaceMachineCodeForFunction(void *Old, void *New) {
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report_fatal_error("MipsJITInfo::replaceMachineCodeForFunction");
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}
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/// JITCompilerFunction - This contains the address of the JIT function used to
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/// compile a function lazily.
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static TargetJITInfo::JITCompilerFn JITCompilerFunction;
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// Get the ASMPREFIX for the current host. This is often '_'.
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#ifndef __USER_LABEL_PREFIX__
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#define __USER_LABEL_PREFIX__
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#endif
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#define GETASMPREFIX2(X) #X
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#define GETASMPREFIX(X) GETASMPREFIX2(X)
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#define ASMPREFIX GETASMPREFIX(__USER_LABEL_PREFIX__)
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// save registers, call MipsCompilationCallbackC, restore registers
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extern "C" {
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#if defined (__mips__)
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void MipsCompilationCallback();
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asm(
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".text\n"
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".align 2\n"
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".globl " ASMPREFIX "MipsCompilationCallback\n"
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ASMPREFIX "MipsCompilationCallback:\n"
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".ent " ASMPREFIX "MipsCompilationCallback\n"
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".set noreorder\n"
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".cpload $t9\n"
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".frame $29, 32, $31\n"
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"addiu $sp, $sp, -40\n"
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"sw $a0, 4($sp)\n"
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"sw $a1, 8($sp)\n"
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"sw $a2, 12($sp)\n"
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"sw $a3, 20($sp)\n"
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"sw $ra, 24($sp)\n"
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"sw $v0, 28($sp)\n"
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"sw $v1, 32($sp)\n"
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"sw $t8, 36($sp)\n"
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".cprestore 16\n"
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"addiu $a0, $t8, -16\n"
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"jal " ASMPREFIX "MipsCompilationCallbackC\n"
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"nop\n"
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"lw $a0, 4($sp)\n"
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"lw $a1, 8($sp)\n"
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"lw $a2, 12($sp)\n"
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"lw $a3, 20($sp)\n"
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"lw $ra, 24($sp)\n"
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"lw $v0, 28($sp)\n"
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"lw $v1, 32($sp)\n"
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"lw $t8, 36($sp)\n"
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"addiu $sp, $sp, 40\n"
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"addiu $t8, $t8, -16\n"
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"jr $t8\n"
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"nop\n"
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".set reorder\n"
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".end " ASMPREFIX "MipsCompilationCallback\n"
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);
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#else // host != Mips
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void MipsCompilationCallback() {
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llvm_unreachable(
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"Cannot call MipsCompilationCallback() on a non-Mips arch!");
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}
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#endif
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}
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/// MipsCompilationCallbackC - This is the target-specific function invoked
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/// by the function stub when we did not know the real target of a call.
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/// This function must locate the start of the stub or call site and pass
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/// it into the JIT compiler function.
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extern "C" void MipsCompilationCallbackC(intptr_t StubAddr) {
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// Get the address of the compiled code for this function.
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intptr_t NewVal = (intptr_t) JITCompilerFunction((void*) StubAddr);
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*(intptr_t *) (StubAddr) = 2 << 26 | ((NewVal & 0x0fffffff) >> 2); // J NewVal
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*(intptr_t *) (StubAddr + 4) = 0; // NOP
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*(intptr_t *) (StubAddr + 8) = 0; // NOP
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*(intptr_t *) (StubAddr + 12) = 0; // NOP
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sys::Memory::InvalidateInstructionCache((void*) StubAddr, 16);
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}
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TargetJITInfo::LazyResolverFn MipsJITInfo::getLazyResolverFunction(
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JITCompilerFn F) {
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JITCompilerFunction = F;
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return MipsCompilationCallback;
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}
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TargetJITInfo::StubLayout MipsJITInfo::getStubLayout() {
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StubLayout Result = { 24, 4 }; // {Size. Alignment} (of FunctionStub)
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return Result;
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}
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void *MipsJITInfo::emitFunctionStub(const Function* F, void *Fn,
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JITCodeEmitter &JCE) {
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JCE.emitAlignment(4);
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void *Addr = (void*) (JCE.getCurrentPCValue());
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unsigned arg0 = ((intptr_t) MipsCompilationCallback >> 16);
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if ((((intptr_t) MipsCompilationCallback & 0xffff) >> 15) == 1) {
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arg0 += 1; // same hack as in relocate()
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}
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// LUI t9, %hi(MipsCompilationCallback)
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JCE.emitWordLE(0xf << 26 | 25 << 16 | arg0);
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// ADDiu t9, t9, %lo(MipsCompilationCallback)
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JCE.emitWordLE(9 << 26 | 25 << 21 | 25 << 16
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| ((intptr_t) MipsCompilationCallback & 0xffff));
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// JALR t8, t9
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JCE.emitWordLE(25 << 21 | 24 << 11 | 9);
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JCE.emitWordLE(0); // NOP
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sys::Memory::InvalidateInstructionCache((void*) Addr, 16);
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return Addr;
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}
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/// relocate - Before the JIT can run a block of code that has been emitted,
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/// it must rewrite the code to contain the actual addresses of any
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/// referenced global symbols.
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void MipsJITInfo::relocate(void *Function, MachineRelocation *MR,
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unsigned NumRelocs, unsigned char* GOTBase) {
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for (unsigned i = 0; i != NumRelocs; ++i, ++MR) {
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void *RelocPos = (char*) Function + MR->getMachineCodeOffset();
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intptr_t ResultPtr = (intptr_t) MR->getResultPointer();
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switch ((Mips::RelocationType) MR->getRelocationType()) {
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case Mips::reloc_mips_pcrel:
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ResultPtr = (((ResultPtr - (intptr_t) RelocPos) - 4) >> 2) & 0xffff;
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*((unsigned*) RelocPos) |= (unsigned) ResultPtr;
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break;
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case Mips::reloc_mips_j_jal: {
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ResultPtr = (ResultPtr & 0x0fffffff) >> 2;
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*((unsigned*) RelocPos) |= (unsigned) ResultPtr;
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}
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break;
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case Mips::reloc_mips_hi: {
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ResultPtr = ResultPtr >> 16;
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// see See MIPS Run Linux, chapter 9.4
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if ((((intptr_t) (MR->getResultPointer()) & 0xffff) >> 15) == 1) {
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ResultPtr += 1;
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}
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*((unsigned*) RelocPos) |= (unsigned) ResultPtr;
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}
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break;
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case Mips::reloc_mips_lo:
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ResultPtr = ResultPtr & 0xffff;
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*((unsigned*) RelocPos) |= (unsigned) ResultPtr;
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break;
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default:
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assert(0 && "MipsJITInfo.unknown relocation;");
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}
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}
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}
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