| //===-- SparcJITInfo.cpp - Implement the JIT interfaces for SparcV9 -------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by the LLVM research group and is distributed under |
| // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the JIT interfaces for the SparcV9 target. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #define DEBUG_TYPE "jit" |
| #include "SparcV9JITInfo.h" |
| #include "SparcV9Relocations.h" |
| #include "llvm/CodeGen/MachineCodeEmitter.h" |
| #include "llvm/Config/alloca.h" |
| #include "llvm/Support/Debug.h" |
| using namespace llvm; |
| |
| /// JITCompilerFunction - This contains the address of the JIT function used to |
| /// compile a function lazily. |
| static TargetJITInfo::JITCompilerFn JITCompilerFunction; |
| |
| /// BUILD_SETHI/BUILD_ORI/BUILD_BA/BUILD_CALL - These macros build sparc machine |
| /// instructions using lots of magic defined by the Sparc ISA. |
| #define BUILD_SETHI(RD, C) (((RD) << 25) | (4 << 22) | (C & ((1 << 22)-1))) |
| #define BUILD_ORI(RS, C, RD) ((2 << 30) | (RD << 25) | (2 << 19) | (RS << 14) |\ |
| (1 << 13) | (C & ((1 << 12)-1))) |
| #define BUILD_BA(DISP) ((8 << 25) | (2 << 22) | (DISP & ((1 << 22)-1))) |
| #define BUILD_CALL(OFFSET) ((1 << 30) | (OFFSET & (1 << 30)-1)) |
| |
| static void InsertJumpAtAddr(int64_t JumpTarget, unsigned *Addr) { |
| // If the target function is close enough to fit into the 19bit disp of |
| // BA, we should use this version, as it's much cheaper to generate. |
| int64_t BranchTarget = (JumpTarget-(intptr_t)Addr) >> 2; |
| if (BranchTarget < (1 << 19) && BranchTarget > -(1 << 19)) { |
| // ba <target> |
| Addr[0] = BUILD_BA(BranchTarget); |
| |
| // nop |
| Addr[1] = 0x01000000; |
| } else { |
| enum { G0 = 0, G1 = 1, G5 = 5 }; |
| // Get address to branch into %g1, using %g5 as a temporary |
| // |
| // sethi %uhi(Target), %g5 ;; get upper 22 bits of Target into %g5 |
| Addr[0] = BUILD_SETHI(G5, JumpTarget >> 42); |
| // or %g5, %ulo(Target), %g5 ;; get 10 lower bits of upper word into %1 |
| Addr[1] = BUILD_ORI(G5, JumpTarget >> 32, G5); |
| // sllx %g5, 32, %g5 ;; shift those 10 bits to the upper word |
| Addr[2] = 0x8B297020; |
| // sethi %hi(Target), %g1 ;; extract bits 10-31 into the dest reg |
| Addr[3] = BUILD_SETHI(G1, JumpTarget >> 10); |
| // or %g5, %g1, %g1 ;; get upper word (in %g5) into %g1 |
| Addr[4] = 0x82114001; |
| // or %g1, %lo(Target), %g1 ;; get lowest 10 bits of Target into %g1 |
| Addr[5] = BUILD_ORI(G1, JumpTarget, G1); |
| |
| // jmpl %g1, %g0, %g0 ;; indirect branch on %g1 |
| Addr[6] = 0x81C00001; |
| // nop ;; delay slot |
| Addr[7] = 0x01000000; |
| } |
| } |
| |
| void SparcV9JITInfo::replaceMachineCodeForFunction (void *Old, void *New) { |
| InsertJumpAtAddr((intptr_t)New, (unsigned*)Old); |
| } |
| |
| |
| static void SaveRegisters(uint64_t DoubleFP[], uint64_t CC[], |
| uint64_t Globals[]) { |
| #if defined(__sparcv9) |
| |
| __asm__ __volatile__ (// Save condition-code registers |
| "stx %%fsr, %0;\n\t" |
| "rd %%fprs, %1;\n\t" |
| "rd %%ccr, %2;\n\t" |
| : "=m"(CC[0]), "=r"(CC[1]), "=r"(CC[2])); |
| |
| __asm__ __volatile__ (// Save globals g1 and g5 |
| "stx %%g1, %0;\n\t" |
| "stx %%g5, %0;\n\t" |
| : "=m"(Globals[0]), "=m"(Globals[1])); |
| |
| // GCC says: `asm' only allows up to thirty parameters! |
| __asm__ __volatile__ (// Save Single/Double FP registers, part 1 |
| "std %%f0, %0;\n\t" "std %%f2, %1;\n\t" |
| "std %%f4, %2;\n\t" "std %%f6, %3;\n\t" |
| "std %%f8, %4;\n\t" "std %%f10, %5;\n\t" |
| "std %%f12, %6;\n\t" "std %%f14, %7;\n\t" |
| "std %%f16, %8;\n\t" "std %%f18, %9;\n\t" |
| "std %%f20, %10;\n\t" "std %%f22, %11;\n\t" |
| "std %%f24, %12;\n\t" "std %%f26, %13;\n\t" |
| "std %%f28, %14;\n\t" "std %%f30, %15;\n\t" |
| : "=m"(DoubleFP[ 0]), "=m"(DoubleFP[ 1]), |
| "=m"(DoubleFP[ 2]), "=m"(DoubleFP[ 3]), |
| "=m"(DoubleFP[ 4]), "=m"(DoubleFP[ 5]), |
| "=m"(DoubleFP[ 6]), "=m"(DoubleFP[ 7]), |
| "=m"(DoubleFP[ 8]), "=m"(DoubleFP[ 9]), |
| "=m"(DoubleFP[10]), "=m"(DoubleFP[11]), |
| "=m"(DoubleFP[12]), "=m"(DoubleFP[13]), |
| "=m"(DoubleFP[14]), "=m"(DoubleFP[15])); |
| |
| __asm__ __volatile__ (// Save Double FP registers, part 2 |
| "std %%f32, %0;\n\t" "std %%f34, %1;\n\t" |
| "std %%f36, %2;\n\t" "std %%f38, %3;\n\t" |
| "std %%f40, %4;\n\t" "std %%f42, %5;\n\t" |
| "std %%f44, %6;\n\t" "std %%f46, %7;\n\t" |
| "std %%f48, %8;\n\t" "std %%f50, %9;\n\t" |
| "std %%f52, %10;\n\t" "std %%f54, %11;\n\t" |
| "std %%f56, %12;\n\t" "std %%f58, %13;\n\t" |
| "std %%f60, %14;\n\t" "std %%f62, %15;\n\t" |
| : "=m"(DoubleFP[16]), "=m"(DoubleFP[17]), |
| "=m"(DoubleFP[18]), "=m"(DoubleFP[19]), |
| "=m"(DoubleFP[20]), "=m"(DoubleFP[21]), |
| "=m"(DoubleFP[22]), "=m"(DoubleFP[23]), |
| "=m"(DoubleFP[24]), "=m"(DoubleFP[25]), |
| "=m"(DoubleFP[26]), "=m"(DoubleFP[27]), |
| "=m"(DoubleFP[28]), "=m"(DoubleFP[29]), |
| "=m"(DoubleFP[30]), "=m"(DoubleFP[31])); |
| #else |
| std::cerr << "ERROR: RUNNING CODE THAT ONLY WORKS ON A SPARCV9 HOST!\n"; |
| abort(); |
| #endif |
| } |
| |
| static void RestoreRegisters(uint64_t DoubleFP[], uint64_t CC[], |
| uint64_t Globals[]) { |
| #if defined(__sparcv9) |
| |
| __asm__ __volatile__ (// Restore condition-code registers |
| "ldx %0, %%fsr;\n\t" |
| "wr %1, 0, %%fprs;\n\t" |
| "wr %2, 0, %%ccr;\n\t" |
| :: "m"(CC[0]), "r"(CC[1]), "r"(CC[2])); |
| |
| __asm__ __volatile__ (// Restore globals g1 and g5 |
| "ldx %0, %%g1;\n\t" |
| "ldx %0, %%g5;\n\t" |
| :: "m"(Globals[0]), "m"(Globals[1])); |
| |
| // GCC says: `asm' only allows up to thirty parameters! |
| __asm__ __volatile__ (// Restore Single/Double FP registers, part 1 |
| "ldd %0, %%f0;\n\t" "ldd %1, %%f2;\n\t" |
| "ldd %2, %%f4;\n\t" "ldd %3, %%f6;\n\t" |
| "ldd %4, %%f8;\n\t" "ldd %5, %%f10;\n\t" |
| "ldd %6, %%f12;\n\t" "ldd %7, %%f14;\n\t" |
| "ldd %8, %%f16;\n\t" "ldd %9, %%f18;\n\t" |
| "ldd %10, %%f20;\n\t" "ldd %11, %%f22;\n\t" |
| "ldd %12, %%f24;\n\t" "ldd %13, %%f26;\n\t" |
| "ldd %14, %%f28;\n\t" "ldd %15, %%f30;\n\t" |
| :: "m"(DoubleFP[0]), "m"(DoubleFP[1]), |
| "m"(DoubleFP[2]), "m"(DoubleFP[3]), |
| "m"(DoubleFP[4]), "m"(DoubleFP[5]), |
| "m"(DoubleFP[6]), "m"(DoubleFP[7]), |
| "m"(DoubleFP[8]), "m"(DoubleFP[9]), |
| "m"(DoubleFP[10]), "m"(DoubleFP[11]), |
| "m"(DoubleFP[12]), "m"(DoubleFP[13]), |
| "m"(DoubleFP[14]), "m"(DoubleFP[15])); |
| |
| __asm__ __volatile__ (// Restore Double FP registers, part 2 |
| "ldd %0, %%f32;\n\t" "ldd %1, %%f34;\n\t" |
| "ldd %2, %%f36;\n\t" "ldd %3, %%f38;\n\t" |
| "ldd %4, %%f40;\n\t" "ldd %5, %%f42;\n\t" |
| "ldd %6, %%f44;\n\t" "ldd %7, %%f46;\n\t" |
| "ldd %8, %%f48;\n\t" "ldd %9, %%f50;\n\t" |
| "ldd %10, %%f52;\n\t" "ldd %11, %%f54;\n\t" |
| "ldd %12, %%f56;\n\t" "ldd %13, %%f58;\n\t" |
| "ldd %14, %%f60;\n\t" "ldd %15, %%f62;\n\t" |
| :: "m"(DoubleFP[16]), "m"(DoubleFP[17]), |
| "m"(DoubleFP[18]), "m"(DoubleFP[19]), |
| "m"(DoubleFP[20]), "m"(DoubleFP[21]), |
| "m"(DoubleFP[22]), "m"(DoubleFP[23]), |
| "m"(DoubleFP[24]), "m"(DoubleFP[25]), |
| "m"(DoubleFP[26]), "m"(DoubleFP[27]), |
| "m"(DoubleFP[28]), "m"(DoubleFP[29]), |
| "m"(DoubleFP[30]), "m"(DoubleFP[31])); |
| #else |
| std::cerr << "ERROR: RUNNING CODE THAT ONLY WORKS ON A SPARCV9 HOST!\n"; |
| abort(); |
| #endif |
| } |
| |
| |
| static void CompilationCallback() { |
| // Local space to save the registers |
| uint64_t DoubleFP[32]; |
| uint64_t CC[3]; |
| uint64_t Globals[2]; |
| |
| SaveRegisters(DoubleFP, CC, Globals); |
| |
| unsigned *CameFrom = (unsigned*)__builtin_return_address(0); |
| unsigned *CameFrom1 = (unsigned*)__builtin_return_address(1); |
| |
| int64_t Target = (intptr_t)JITCompilerFunction(CameFrom); |
| |
| DEBUG(std::cerr << "In callback! Addr=" << (void*)CameFrom << "\n"); |
| |
| // If we can rewrite the ORIGINAL caller, we eliminate the whole need for a |
| // trampoline function stub!! |
| unsigned OrigCallInst = *CameFrom1; |
| int64_t OrigTarget = (Target-(intptr_t)CameFrom1) >> 2; |
| if ((OrigCallInst >> 30) == 1 && |
| (OrigTarget <= (1 << 30) && OrigTarget >= -(1 << 30))) { |
| // The original call instruction was CALL <immed>, which means we can |
| // overwrite it directly, since the offset will fit into 30 bits |
| *CameFrom1 = BUILD_CALL(OrigTarget); |
| //++OverwrittenCalls; |
| } else { |
| //++UnmodifiedCalls; |
| } |
| |
| // Rewrite the call target so that we don't fault every time we execute it. |
| // |
| unsigned OrigStubCallInst = *CameFrom; |
| |
| // Subtract enough to overwrite up to the 'save' instruction |
| // This depends on whether we made a short call (1 instruction) or the |
| // farCall (7 instructions) |
| int Offset = ((OrigStubCallInst >> 30) == 1) ? 1 : 7; |
| unsigned *CodeBegin = CameFrom - Offset; |
| |
| // FIXME: __builtin_frame_address doesn't work if frame pointer elimination |
| // has been performed. Having a variable sized alloca disables frame pointer |
| // elimination currently, even if it's dead. This is a gross hack. |
| alloca(42+Offset); |
| |
| // Make sure that what we're about to overwrite is indeed "save". |
| if (*CodeBegin != 0x9DE3BF40) { |
| std::cerr << "About to overwrite smthg not a save instr!"; |
| abort(); |
| } |
| |
| // Overwrite it |
| InsertJumpAtAddr(Target, CodeBegin); |
| |
| // 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(__sparcv9) |
| for (int i = -Offset*4, e = 32-((int64_t)Offset*4); i < e; i += 8) |
| __asm__ __volatile__ ("flush %%i7 + %0" : : "r" (i)); |
| #endif |
| |
| // Change the return address to re-execute the restore, then the jump. |
| DEBUG(std::cerr << "Callback returning to: 0x" |
| << std::hex << (CameFrom-Offset*4-12) << "\n"); |
| #if defined(__sparcv9) |
| __asm__ __volatile__ ("sub %%i7, %0, %%i7" : : "r" (Offset*4+12)); |
| #endif |
| |
| RestoreRegisters(DoubleFP, CC, Globals); |
| } |
| |
| |
| /// emitStubForFunction - This method is used by the JIT when it needs to emit |
| /// the address of a function for a function whose code has not yet been |
| /// generated. In order to do this, it generates a stub which jumps to the lazy |
| /// function compiler, which will eventually get fixed to call the function |
| /// directly. |
| /// |
| void *SparcV9JITInfo::emitFunctionStub(void *Fn, MachineCodeEmitter &MCE) { |
| if (Fn != CompilationCallback) { |
| // If this is just a call to an external function, |
| MCE.startFunctionStub(4*8); |
| unsigned *Stub = (unsigned*)(intptr_t)MCE.getCurrentPCValue(); |
| for (unsigned i = 0; i != 8; ++i) |
| MCE.emitWord(0); |
| InsertJumpAtAddr((intptr_t)Fn, Stub); |
| return MCE.finishFunctionStub(0); // 1 instr past the restore |
| } |
| |
| MCE.startFunctionStub(44); |
| MCE.emitWord(0x81e82000); // restore %g0, 0, %g0 |
| MCE.emitWord(0x9DE3BF40); // save %sp, -192, %sp |
| |
| int64_t CurrPC = MCE.getCurrentPCValue(); |
| int64_t Addr = (intptr_t)Fn; |
| int64_t CallTarget = (Addr-CurrPC) >> 2; |
| if (CallTarget < (1 << 29) && CallTarget > -(1 << 29)) { |
| // call CallTarget |
| MCE.emitWord((0x01 << 30) | CallTarget); |
| } else { |
| enum {G5 = 5, G1 = 1 }; |
| // Otherwise, we need to emit a sequence of instructions to call a distant |
| // function. We use %g5 as a temporary, and compute the value into %g1 |
| |
| // sethi %uhi(Target), %g5 ;; get upper 22 bits of Target into %g5 |
| MCE.emitWord(BUILD_SETHI(G5, Addr >> 42)); |
| // or %g5, %ulo(Target), %g5 ;; get 10 lower bits of upper word into %1 |
| MCE.emitWord(BUILD_ORI(G5, Addr >> 32, G5)); |
| // sllx %g5, 32, %g5 ;; shift those 10 bits to the upper word |
| MCE.emitWord(0x8B297020); |
| // sethi %hi(Target), %g1 ;; extract bits 10-31 into the dest reg |
| MCE.emitWord(BUILD_SETHI(G1, Addr >> 10)); |
| // or %g5, %g1, %g1 ;; get upper word (in %g5) into %g1 |
| MCE.emitWord(0x82114001); |
| // or %g1, %lo(Target), %g1 ;; get lowest 10 bits of Target into %g1 |
| MCE.emitWord(BUILD_ORI(G1, Addr, G1)); |
| |
| // call %g1 ;; indirect call on %g1 |
| MCE.emitWord(0x9FC04000); |
| } |
| |
| // nop ;; call delay slot |
| MCE.emitWord(0x1000000); |
| |
| // FIXME: Should have a restore and return! |
| |
| MCE.emitWord(0xDEADBEEF); // marker so that we know it's really a stub |
| return (char*)MCE.finishFunctionStub(0)+4; // 1 instr past the restore |
| } |
| |
| |
| |
| TargetJITInfo::LazyResolverFn |
| SparcV9JITInfo::getLazyResolverFunction(JITCompilerFn F) { |
| JITCompilerFunction = F; |
| return CompilationCallback; |
| } |
| |
| void SparcV9JITInfo::relocate(void *Function, MachineRelocation *MR, |
| unsigned NumRelocs) { |
| for (unsigned i = 0; i != NumRelocs; ++i, ++MR) { |
| unsigned *RelocPos = (unsigned*)Function + MR->getMachineCodeOffset()/4; |
| intptr_t ResultPtr = (intptr_t)MR->getResultPointer(); |
| switch ((V9::RelocationType)MR->getRelocationType()) { |
| default: assert(0 && "Unknown relocation type!"); |
| case V9::reloc_pcrel_call: |
| ResultPtr = (ResultPtr-(intptr_t)RelocPos) >> 2; // PC relative. |
| assert((ResultPtr < (1 << 29) && ResultPtr > -(1 << 29)) && |
| "reloc_pcrel_call is out of range!"); |
| // The high two bits of the call are always set to 01. |
| *RelocPos = (1 << 30) | (ResultPtr & ((1 << 30)-1)) ; |
| break; |
| case V9::reloc_sethi_hh: |
| case V9::reloc_sethi_lm: |
| ResultPtr >>= (MR->getRelocationType() == V9::reloc_sethi_hh ? 32 : 0); |
| ResultPtr >>= 10; |
| ResultPtr &= (1 << 22)-1; |
| *RelocPos |= (unsigned)ResultPtr; |
| break; |
| case V9::reloc_or_hm: |
| case V9::reloc_or_lo: |
| ResultPtr >>= (MR->getRelocationType() == V9::reloc_or_hm ? 32 : 0); |
| ResultPtr &= (1 << 12)-1; |
| *RelocPos |= (unsigned)ResultPtr; |
| break; |
| } |
| } |
| } |