306 lines
9.4 KiB
C++
306 lines
9.4 KiB
C++
//===-- AlphaJITInfo.cpp - Implement the JIT interfaces for the Alpha ---===//
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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 Alpha target.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "jit"
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#include "AlphaJITInfo.h"
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#include "AlphaRelocations.h"
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include "llvm/Config/alloca.h"
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#include "llvm/Support/Debug.h"
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#include <cstdlib>
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#include <map>
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using namespace llvm;
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#define BUILD_OFormatI(Op, RA, LIT, FUN, RC) \
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((Op << 26) | (RA << 21) | (LIT << 13) | (1 << 12) | (FUN << 5) | (RC))
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#define BUILD_OFormat(Op, RA, RB, FUN, RC) \
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((Op << 26) | (RA << 21) | (RB << 16) | (FUN << 5) | (RC))
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#define BUILD_LDA(RD, RS, IMM16) \
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((0x08 << 26) | ((RD) << 21) | ((RS) << 16) | ((IMM16) & 65535))
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#define BUILD_LDAH(RD, RS, IMM16) \
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((0x09 << 26) | ((RD) << 21) | ((RS) << 16) | ((IMM16) & 65535))
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#define BUILD_LDQ(RD, RS, IMM16) \
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((0x29 << 26) | ((RD) << 21) | ((RS) << 16) | ((IMM16) & 0xFFFF))
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#define BUILD_JMP(RD, RS, IMM16) \
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((0x1A << 26) | ((RD) << 21) | ((RS) << 16) | (0x00 << 14) | ((IMM16) & 0x3FFF))
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#define BUILD_JSR(RD, RS, IMM16) \
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((0x1A << 26) | ((RD) << 21) | ((RS) << 16) | (0x01 << 14) | ((IMM16) & 0x3FFF))
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#define BUILD_SLLi(RD, RS, IMM8) \
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(BUILD_OFormatI(0x12, RS, IMM8, 0x39, RD))
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#define BUILD_ORi(RD, RS, IMM8) \
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(BUILD_OFormatI(0x11, RS, IMM8, 0x20, RD))
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#define BUILD_OR(RD, RS, RT) \
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(BUILD_OFormat(0x11, RS, RT, 0x20, RD))
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static void EmitBranchToAt(void *At, void *To) {
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unsigned long Fn = (unsigned long)To;
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unsigned *AtI = (unsigned*)At;
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AtI[0] = BUILD_OR(0, 27, 27);
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DOUT << "Stub targeting " << To << "\n";
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for (int x = 1; x <= 8; ++x) {
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AtI[2*x - 1] = BUILD_SLLi(27,27,8);
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unsigned d = (Fn >> (64 - 8 * x)) & 0x00FF;
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//DOUT << "outputing " << hex << d << dec << "\n";
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AtI[2*x] = BUILD_ORi(27, 27, d);
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}
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AtI[17] = BUILD_JMP(31,27,0); //jump, preserving ra, and setting pv
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AtI[18] = 0x00FFFFFF; //mark this as a stub
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}
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void AlphaJITInfo::replaceMachineCodeForFunction(void *Old, void *New) {
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//FIXME
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assert(0);
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}
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static TargetJITInfo::JITCompilerFn JITCompilerFunction;
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//static AlphaJITInfo* AlphaJTI;
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extern "C" {
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#ifdef __alpha
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void AlphaCompilationCallbackC(long* oldpv, void* CameFromStub)
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{
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void* Target = JITCompilerFunction(CameFromStub);
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//rewrite the stub to an unconditional branch
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if (((unsigned*)CameFromStub)[18] == 0x00FFFFFF) {
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DOUT << "Came from a stub, rewriting\n";
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EmitBranchToAt(CameFromStub, Target);
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} else {
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DOUT << "confused, didn't come from stub at " << CameFromStub
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<< " old jump vector " << oldpv
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<< " new jump vector " << Target << "\n";
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}
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//Change pv to new Target
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*oldpv = (long)Target;
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}
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void AlphaCompilationCallback(void);
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asm(
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".text\n"
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".globl AlphaComilationCallbackC\n"
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".align 4\n"
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".globl AlphaCompilationCallback\n"
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".ent AlphaCompilationCallback\n"
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"AlphaCompilationCallback:\n"
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// //get JIT's GOT
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"ldgp $29, 0($27)\n"
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//Save args, callee saved, and perhaps others?
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//args: $16-$21 $f16-$f21 (12)
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//callee: $9-$14 $f2-$f9 (14)
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//others: fp:$15 ra:$26 pv:$27 (3)
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"lda $30, -232($30)\n"
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"stq $16, 0($30)\n"
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"stq $17, 8($30)\n"
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"stq $18, 16($30)\n"
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"stq $19, 24($30)\n"
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"stq $20, 32($30)\n"
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"stq $21, 40($30)\n"
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"stt $f16, 48($30)\n"
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"stt $f17, 56($30)\n"
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"stt $f18, 64($30)\n"
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"stt $f19, 72($30)\n"
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"stt $f20, 80($30)\n"
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"stt $f21, 88($30)\n"
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"stq $9, 96($30)\n"
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"stq $10, 104($30)\n"
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"stq $11, 112($30)\n"
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"stq $12, 120($30)\n"
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"stq $13, 128($30)\n"
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"stq $14, 136($30)\n"
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"stt $f2, 144($30)\n"
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"stt $f3, 152($30)\n"
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"stt $f4, 160($30)\n"
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"stt $f5, 168($30)\n"
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"stt $f6, 176($30)\n"
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"stt $f7, 184($30)\n"
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"stt $f8, 192($30)\n"
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"stt $f9, 200($30)\n"
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"stq $15, 208($30)\n"
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"stq $26, 216($30)\n"
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"stq $27, 224($30)\n"
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"addq $30, 224, $16\n" //pass the addr of saved pv as the first arg
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"bis $0, $0, $17\n" //pass the roughly stub addr in second arg
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"jsr $26, AlphaCompilationCallbackC\n" //call without saving ra
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"ldq $16, 0($30)\n"
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"ldq $17, 8($30)\n"
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"ldq $18, 16($30)\n"
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"ldq $19, 24($30)\n"
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"ldq $20, 32($30)\n"
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"ldq $21, 40($30)\n"
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"ldt $f16, 48($30)\n"
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"ldt $f17, 56($30)\n"
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"ldt $f18, 64($30)\n"
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"ldt $f19, 72($30)\n"
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"ldt $f20, 80($30)\n"
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"ldt $f21, 88($30)\n"
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"ldq $9, 96($30)\n"
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"ldq $10, 104($30)\n"
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"ldq $11, 112($30)\n"
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"ldq $12, 120($30)\n"
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"ldq $13, 128($30)\n"
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"ldq $14, 136($30)\n"
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"ldt $f2, 144($30)\n"
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"ldt $f3, 152($30)\n"
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"ldt $f4, 160($30)\n"
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"ldt $f5, 168($30)\n"
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"ldt $f6, 176($30)\n"
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"ldt $f7, 184($30)\n"
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"ldt $f8, 192($30)\n"
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"ldt $f9, 200($30)\n"
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"ldq $15, 208($30)\n"
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"ldq $26, 216($30)\n"
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"ldq $27, 224($30)\n" //this was updated in the callback with the target
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"lda $30, 232($30)\n" //restore sp
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"jmp $31, ($27)\n" //jump to the new function
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".end AlphaCompilationCallback\n"
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);
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#else
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void AlphaCompilationCallback() {
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cerr << "Cannot call AlphaCompilationCallback() on a non-Alpha arch!\n";
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abort();
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}
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#endif
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}
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void *AlphaJITInfo::emitFunctionStub(void *Fn, MachineCodeEmitter &MCE) {
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//assert(Fn == AlphaCompilationCallback && "Where are you going?\n");
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//Do things in a stupid slow way!
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MCE.startFunctionStub(19*4);
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void* Addr = (void*)(intptr_t)MCE.getCurrentPCValue();
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for (int x = 0; x < 19; ++ x)
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MCE.emitWordLE(0);
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EmitBranchToAt(Addr, Fn);
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DOUT << "Emitting Stub to " << Fn << " at [" << Addr << "]\n";
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return MCE.finishFunctionStub(0);
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}
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TargetJITInfo::LazyResolverFn
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AlphaJITInfo::getLazyResolverFunction(JITCompilerFn F) {
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JITCompilerFunction = F;
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// setZerothGOTEntry((void*)AlphaCompilationCallback);
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return AlphaCompilationCallback;
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}
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//These describe LDAx
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static const int IMM_LOW = -32768;
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static const int IMM_HIGH = 32767;
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static const int IMM_MULT = 65536;
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static long getUpper16(long l)
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{
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long y = l / IMM_MULT;
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if (l % IMM_MULT > IMM_HIGH)
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++y;
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if (l % IMM_MULT < IMM_LOW)
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--y;
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assert((short)y == y && "displacement out of range");
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return y;
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}
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static long getLower16(long l)
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{
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long h = getUpper16(l);
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long y = l - h * IMM_MULT;
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assert(y == (short)y && "Displacement out of range");
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return y;
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}
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void AlphaJITInfo::relocate(void *Function, MachineRelocation *MR,
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unsigned NumRelocs, unsigned char* GOTBase) {
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//because gpdist are paired and relative to the pc of the first inst,
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//we need to have some state
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static std::map<std::pair<void*, int>, void*> gpdistmap;
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for (unsigned i = 0; i != NumRelocs; ++i, ++MR) {
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unsigned *RelocPos = (unsigned*)Function + MR->getMachineCodeOffset()/4;
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long idx = 0;
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bool doCommon = true;
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switch ((Alpha::RelocationType)MR->getRelocationType()) {
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default: assert(0 && "Unknown relocation type!");
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case Alpha::reloc_literal:
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//This is a LDQl
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idx = MR->getGOTIndex();
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DOUT << "Literal relocation to slot " << idx;
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idx = (idx - GOToffset) * 8;
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DOUT << " offset " << idx << "\n";
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break;
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case Alpha::reloc_gprellow:
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idx = (unsigned char*)MR->getResultPointer() - &GOTBase[GOToffset * 8];
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idx = getLower16(idx);
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DOUT << "gprellow relocation offset " << idx << "\n";
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DOUT << " Pointer is " << (void*)MR->getResultPointer()
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<< " GOT is " << (void*)&GOTBase[GOToffset * 8] << "\n";
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break;
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case Alpha::reloc_gprelhigh:
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idx = (unsigned char*)MR->getResultPointer() - &GOTBase[GOToffset * 8];
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idx = getUpper16(idx);
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DOUT << "gprelhigh relocation offset " << idx << "\n";
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DOUT << " Pointer is " << (void*)MR->getResultPointer()
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<< " GOT is " << (void*)&GOTBase[GOToffset * 8] << "\n";
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break;
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case Alpha::reloc_gpdist:
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switch (*RelocPos >> 26) {
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case 0x09: //LDAH
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idx = &GOTBase[GOToffset * 8] - (unsigned char*)RelocPos;
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idx = getUpper16(idx);
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DOUT << "LDAH: " << idx << "\n";
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//add the relocation to the map
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gpdistmap[std::make_pair(Function, MR->getConstantVal())] = RelocPos;
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break;
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case 0x08: //LDA
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assert(gpdistmap[std::make_pair(Function, MR->getConstantVal())] &&
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"LDAg without seeing LDAHg");
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idx = &GOTBase[GOToffset * 8] -
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(unsigned char*)gpdistmap[std::make_pair(Function, MR->getConstantVal())];
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idx = getLower16(idx);
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DOUT << "LDA: " << idx << "\n";
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break;
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default:
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assert(0 && "Cannot handle gpdist yet");
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}
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break;
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case Alpha::reloc_bsr: {
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idx = (((unsigned char*)MR->getResultPointer() -
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(unsigned char*)RelocPos) >> 2) + 1; //skip first 2 inst of fun
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*RelocPos |= (idx & ((1 << 21)-1));
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doCommon = false;
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break;
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}
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}
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if (doCommon) {
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short x = (short)idx;
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assert(x == idx);
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*(short*)RelocPos = x;
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}
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}
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}
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