| //===-- PPCJITInfo.cpp - Implement the JIT interfaces for the PowerPC -----===// |
| // |
| // 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 32-bit PowerPC target. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #define DEBUG_TYPE "jit" |
| #include "PPCJITInfo.h" |
| #include "PPCRelocations.h" |
| #include "PPCTargetMachine.h" |
| #include "llvm/Function.h" |
| #include "llvm/System/Memory.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/raw_ostream.h" |
| using namespace llvm; |
| |
| static TargetJITInfo::JITCompilerFn JITCompilerFunction; |
| |
| #define BUILD_ADDIS(RD,RS,IMM16) \ |
| ((15 << 26) | ((RD) << 21) | ((RS) << 16) | ((IMM16) & 65535)) |
| #define BUILD_ORI(RD,RS,UIMM16) \ |
| ((24 << 26) | ((RS) << 21) | ((RD) << 16) | ((UIMM16) & 65535)) |
| #define BUILD_ORIS(RD,RS,UIMM16) \ |
| ((25 << 26) | ((RS) << 21) | ((RD) << 16) | ((UIMM16) & 65535)) |
| #define BUILD_RLDICR(RD,RS,SH,ME) \ |
| ((30 << 26) | ((RS) << 21) | ((RD) << 16) | (((SH) & 31) << 11) | \ |
| (((ME) & 63) << 6) | (1 << 2) | ((((SH) >> 5) & 1) << 1)) |
| #define BUILD_MTSPR(RS,SPR) \ |
| ((31 << 26) | ((RS) << 21) | ((SPR) << 16) | (467 << 1)) |
| #define BUILD_BCCTRx(BO,BI,LINK) \ |
| ((19 << 26) | ((BO) << 21) | ((BI) << 16) | (528 << 1) | ((LINK) & 1)) |
| #define BUILD_B(TARGET, LINK) \ |
| ((18 << 26) | (((TARGET) & 0x00FFFFFF) << 2) | ((LINK) & 1)) |
| |
| // Pseudo-ops |
| #define BUILD_LIS(RD,IMM16) BUILD_ADDIS(RD,0,IMM16) |
| #define BUILD_SLDI(RD,RS,IMM6) BUILD_RLDICR(RD,RS,IMM6,63-IMM6) |
| #define BUILD_MTCTR(RS) BUILD_MTSPR(RS,9) |
| #define BUILD_BCTR(LINK) BUILD_BCCTRx(20,0,LINK) |
| |
| static void EmitBranchToAt(uint64_t At, uint64_t To, bool isCall, bool is64Bit){ |
| intptr_t Offset = ((intptr_t)To - (intptr_t)At) >> 2; |
| unsigned *AtI = (unsigned*)(intptr_t)At; |
| |
| if (Offset >= -(1 << 23) && Offset < (1 << 23)) { // In range? |
| AtI[0] = BUILD_B(Offset, isCall); // b/bl target |
| } else if (!is64Bit) { |
| AtI[0] = BUILD_LIS(12, To >> 16); // lis r12, hi16(address) |
| AtI[1] = BUILD_ORI(12, 12, To); // ori r12, r12, lo16(address) |
| AtI[2] = BUILD_MTCTR(12); // mtctr r12 |
| AtI[3] = BUILD_BCTR(isCall); // bctr/bctrl |
| } else { |
| AtI[0] = BUILD_LIS(12, To >> 48); // lis r12, hi16(address) |
| AtI[1] = BUILD_ORI(12, 12, To >> 32); // ori r12, r12, lo16(address) |
| AtI[2] = BUILD_SLDI(12, 12, 32); // sldi r12, r12, 32 |
| AtI[3] = BUILD_ORIS(12, 12, To >> 16); // oris r12, r12, hi16(address) |
| AtI[4] = BUILD_ORI(12, 12, To); // ori r12, r12, lo16(address) |
| AtI[5] = BUILD_MTCTR(12); // mtctr r12 |
| AtI[6] = BUILD_BCTR(isCall); // bctr/bctrl |
| } |
| } |
| |
| extern "C" void PPC32CompilationCallback(); |
| extern "C" void PPC64CompilationCallback(); |
| |
| #if (defined(__POWERPC__) || defined (__ppc__) || defined(_POWER)) && \ |
| !(defined(__ppc64__) || defined(__FreeBSD__)) |
| // CompilationCallback stub - We can't use a C function with inline assembly in |
| // it, because we the prolog/epilog inserted by GCC won't work for us. Instead, |
| // write our own wrapper, which does things our way, so we have complete control |
| // over register saving and restoring. |
| asm( |
| ".text\n" |
| ".align 2\n" |
| ".globl _PPC32CompilationCallback\n" |
| "_PPC32CompilationCallback:\n" |
| // Make space for 8 ints r[3-10] and 13 doubles f[1-13] and the |
| // FIXME: need to save v[0-19] for altivec? |
| // FIXME: could shrink frame |
| // Set up a proper stack frame |
| // FIXME Layout |
| // PowerPC64 ABI linkage - 24 bytes |
| // parameters - 32 bytes |
| // 13 double registers - 104 bytes |
| // 8 int registers - 32 bytes |
| "mflr r0\n" |
| "stw r0, 8(r1)\n" |
| "stwu r1, -208(r1)\n" |
| // Save all int arg registers |
| "stw r10, 204(r1)\n" "stw r9, 200(r1)\n" |
| "stw r8, 196(r1)\n" "stw r7, 192(r1)\n" |
| "stw r6, 188(r1)\n" "stw r5, 184(r1)\n" |
| "stw r4, 180(r1)\n" "stw r3, 176(r1)\n" |
| // Save all call-clobbered FP regs. |
| "stfd f13, 168(r1)\n" "stfd f12, 160(r1)\n" |
| "stfd f11, 152(r1)\n" "stfd f10, 144(r1)\n" |
| "stfd f9, 136(r1)\n" "stfd f8, 128(r1)\n" |
| "stfd f7, 120(r1)\n" "stfd f6, 112(r1)\n" |
| "stfd f5, 104(r1)\n" "stfd f4, 96(r1)\n" |
| "stfd f3, 88(r1)\n" "stfd f2, 80(r1)\n" |
| "stfd f1, 72(r1)\n" |
| // Arguments to Compilation Callback: |
| // r3 - our lr (address of the call instruction in stub plus 4) |
| // r4 - stub's lr (address of instruction that called the stub plus 4) |
| // r5 - is64Bit - always 0. |
| "mr r3, r0\n" |
| "lwz r2, 208(r1)\n" // stub's frame |
| "lwz r4, 8(r2)\n" // stub's lr |
| "li r5, 0\n" // 0 == 32 bit |
| "bl _PPCCompilationCallbackC\n" |
| "mtctr r3\n" |
| // Restore all int arg registers |
| "lwz r10, 204(r1)\n" "lwz r9, 200(r1)\n" |
| "lwz r8, 196(r1)\n" "lwz r7, 192(r1)\n" |
| "lwz r6, 188(r1)\n" "lwz r5, 184(r1)\n" |
| "lwz r4, 180(r1)\n" "lwz r3, 176(r1)\n" |
| // Restore all FP arg registers |
| "lfd f13, 168(r1)\n" "lfd f12, 160(r1)\n" |
| "lfd f11, 152(r1)\n" "lfd f10, 144(r1)\n" |
| "lfd f9, 136(r1)\n" "lfd f8, 128(r1)\n" |
| "lfd f7, 120(r1)\n" "lfd f6, 112(r1)\n" |
| "lfd f5, 104(r1)\n" "lfd f4, 96(r1)\n" |
| "lfd f3, 88(r1)\n" "lfd f2, 80(r1)\n" |
| "lfd f1, 72(r1)\n" |
| // Pop 3 frames off the stack and branch to target |
| "lwz r1, 208(r1)\n" |
| "lwz r2, 8(r1)\n" |
| "mtlr r2\n" |
| "bctr\n" |
| ); |
| |
| #elif defined(__PPC__) && !defined(__ppc64__) |
| // Linux & FreeBSD / PPC 32 support |
| |
| // CompilationCallback stub - We can't use a C function with inline assembly in |
| // it, because we the prolog/epilog inserted by GCC won't work for us. Instead, |
| // write our own wrapper, which does things our way, so we have complete control |
| // over register saving and restoring. |
| asm( |
| ".text\n" |
| ".align 2\n" |
| ".globl PPC32CompilationCallback\n" |
| "PPC32CompilationCallback:\n" |
| // Make space for 8 ints r[3-10] and 8 doubles f[1-8] and the |
| // FIXME: need to save v[0-19] for altivec? |
| // FIXME: could shrink frame |
| // Set up a proper stack frame |
| // FIXME Layout |
| // 8 double registers - 64 bytes |
| // 8 int registers - 32 bytes |
| "mflr 0\n" |
| "stw 0, 4(1)\n" |
| "stwu 1, -104(1)\n" |
| // Save all int arg registers |
| "stw 10, 100(1)\n" "stw 9, 96(1)\n" |
| "stw 8, 92(1)\n" "stw 7, 88(1)\n" |
| "stw 6, 84(1)\n" "stw 5, 80(1)\n" |
| "stw 4, 76(1)\n" "stw 3, 72(1)\n" |
| // Save all call-clobbered FP regs. |
| "stfd 8, 64(1)\n" |
| "stfd 7, 56(1)\n" "stfd 6, 48(1)\n" |
| "stfd 5, 40(1)\n" "stfd 4, 32(1)\n" |
| "stfd 3, 24(1)\n" "stfd 2, 16(1)\n" |
| "stfd 1, 8(1)\n" |
| // Arguments to Compilation Callback: |
| // r3 - our lr (address of the call instruction in stub plus 4) |
| // r4 - stub's lr (address of instruction that called the stub plus 4) |
| // r5 - is64Bit - always 0. |
| "mr 3, 0\n" |
| "lwz 5, 104(1)\n" // stub's frame |
| "lwz 4, 4(5)\n" // stub's lr |
| "li 5, 0\n" // 0 == 32 bit |
| "bl PPCCompilationCallbackC\n" |
| "mtctr 3\n" |
| // Restore all int arg registers |
| "lwz 10, 100(1)\n" "lwz 9, 96(1)\n" |
| "lwz 8, 92(1)\n" "lwz 7, 88(1)\n" |
| "lwz 6, 84(1)\n" "lwz 5, 80(1)\n" |
| "lwz 4, 76(1)\n" "lwz 3, 72(1)\n" |
| // Restore all FP arg registers |
| "lfd 8, 64(1)\n" |
| "lfd 7, 56(1)\n" "lfd 6, 48(1)\n" |
| "lfd 5, 40(1)\n" "lfd 4, 32(1)\n" |
| "lfd 3, 24(1)\n" "lfd 2, 16(1)\n" |
| "lfd 1, 8(1)\n" |
| // Pop 3 frames off the stack and branch to target |
| "lwz 1, 104(1)\n" |
| "lwz 0, 4(1)\n" |
| "mtlr 0\n" |
| "bctr\n" |
| ); |
| #else |
| void PPC32CompilationCallback() { |
| llvm_unreachable("This is not a power pc, you can't execute this!"); |
| } |
| #endif |
| |
| #if (defined(__POWERPC__) || defined (__ppc__) || defined(_POWER)) && \ |
| defined(__ppc64__) |
| asm( |
| ".text\n" |
| ".align 2\n" |
| ".globl _PPC64CompilationCallback\n" |
| "_PPC64CompilationCallback:\n" |
| // Make space for 8 ints r[3-10] and 13 doubles f[1-13] and the |
| // FIXME: need to save v[0-19] for altivec? |
| // Set up a proper stack frame |
| // Layout |
| // PowerPC64 ABI linkage - 48 bytes |
| // parameters - 64 bytes |
| // 13 double registers - 104 bytes |
| // 8 int registers - 64 bytes |
| "mflr r0\n" |
| "std r0, 16(r1)\n" |
| "stdu r1, -280(r1)\n" |
| // Save all int arg registers |
| "std r10, 272(r1)\n" "std r9, 264(r1)\n" |
| "std r8, 256(r1)\n" "std r7, 248(r1)\n" |
| "std r6, 240(r1)\n" "std r5, 232(r1)\n" |
| "std r4, 224(r1)\n" "std r3, 216(r1)\n" |
| // Save all call-clobbered FP regs. |
| "stfd f13, 208(r1)\n" "stfd f12, 200(r1)\n" |
| "stfd f11, 192(r1)\n" "stfd f10, 184(r1)\n" |
| "stfd f9, 176(r1)\n" "stfd f8, 168(r1)\n" |
| "stfd f7, 160(r1)\n" "stfd f6, 152(r1)\n" |
| "stfd f5, 144(r1)\n" "stfd f4, 136(r1)\n" |
| "stfd f3, 128(r1)\n" "stfd f2, 120(r1)\n" |
| "stfd f1, 112(r1)\n" |
| // Arguments to Compilation Callback: |
| // r3 - our lr (address of the call instruction in stub plus 4) |
| // r4 - stub's lr (address of instruction that called the stub plus 4) |
| // r5 - is64Bit - always 1. |
| "mr r3, r0\n" |
| "ld r2, 280(r1)\n" // stub's frame |
| "ld r4, 16(r2)\n" // stub's lr |
| "li r5, 1\n" // 1 == 64 bit |
| "bl _PPCCompilationCallbackC\n" |
| "mtctr r3\n" |
| // Restore all int arg registers |
| "ld r10, 272(r1)\n" "ld r9, 264(r1)\n" |
| "ld r8, 256(r1)\n" "ld r7, 248(r1)\n" |
| "ld r6, 240(r1)\n" "ld r5, 232(r1)\n" |
| "ld r4, 224(r1)\n" "ld r3, 216(r1)\n" |
| // Restore all FP arg registers |
| "lfd f13, 208(r1)\n" "lfd f12, 200(r1)\n" |
| "lfd f11, 192(r1)\n" "lfd f10, 184(r1)\n" |
| "lfd f9, 176(r1)\n" "lfd f8, 168(r1)\n" |
| "lfd f7, 160(r1)\n" "lfd f6, 152(r1)\n" |
| "lfd f5, 144(r1)\n" "lfd f4, 136(r1)\n" |
| "lfd f3, 128(r1)\n" "lfd f2, 120(r1)\n" |
| "lfd f1, 112(r1)\n" |
| // Pop 3 frames off the stack and branch to target |
| "ld r1, 280(r1)\n" |
| "ld r2, 16(r1)\n" |
| "mtlr r2\n" |
| "bctr\n" |
| ); |
| #else |
| void PPC64CompilationCallback() { |
| llvm_unreachable("This is not a power pc, you can't execute this!"); |
| } |
| #endif |
| |
| extern "C" void *PPCCompilationCallbackC(unsigned *StubCallAddrPlus4, |
| unsigned *OrigCallAddrPlus4, |
| bool is64Bit) { |
| // Adjust the pointer to the address of the call instruction in the stub |
| // emitted by emitFunctionStub, rather than the instruction after it. |
| unsigned *StubCallAddr = StubCallAddrPlus4 - 1; |
| unsigned *OrigCallAddr = OrigCallAddrPlus4 - 1; |
| |
| void *Target = JITCompilerFunction(StubCallAddr); |
| |
| // Check to see if *OrigCallAddr is a 'bl' instruction, and if we can rewrite |
| // it to branch directly to the destination. If so, rewrite it so it does not |
| // need to go through the stub anymore. |
| unsigned OrigCallInst = *OrigCallAddr; |
| if ((OrigCallInst >> 26) == 18) { // Direct call. |
| intptr_t Offset = ((intptr_t)Target - (intptr_t)OrigCallAddr) >> 2; |
| |
| if (Offset >= -(1 << 23) && Offset < (1 << 23)) { // In range? |
| // Clear the original target out. |
| OrigCallInst &= (63 << 26) | 3; |
| // Fill in the new target. |
| OrigCallInst |= (Offset & ((1 << 24)-1)) << 2; |
| // Replace the call. |
| *OrigCallAddr = OrigCallInst; |
| } |
| } |
| |
| // Assert that we are coming from a stub that was created with our |
| // emitFunctionStub. |
| if ((*StubCallAddr >> 26) == 18) |
| StubCallAddr -= 3; |
| else { |
| assert((*StubCallAddr >> 26) == 19 && "Call in stub is not indirect!"); |
| StubCallAddr -= is64Bit ? 9 : 6; |
| } |
| |
| // Rewrite the stub with an unconditional branch to the target, for any users |
| // who took the address of the stub. |
| EmitBranchToAt((intptr_t)StubCallAddr, (intptr_t)Target, false, is64Bit); |
| |
| // Put the address of the target function to call and the address to return to |
| // after calling the target function in a place that is easy to get on the |
| // stack after we restore all regs. |
| return Target; |
| } |
| |
| |
| |
| TargetJITInfo::LazyResolverFn |
| PPCJITInfo::getLazyResolverFunction(JITCompilerFn Fn) { |
| JITCompilerFunction = Fn; |
| return is64Bit ? PPC64CompilationCallback : PPC32CompilationCallback; |
| } |
| |
| #if (defined(__POWERPC__) || defined (__ppc__) || defined(_POWER)) && \ |
| defined(__APPLE__) |
| extern "C" void sys_icache_invalidate(const void *Addr, size_t len); |
| #endif |
| |
| void *PPCJITInfo::emitFunctionStub(const Function* F, void *Fn, |
| JITCodeEmitter &JCE) { |
| // If this is just a call to an external function, emit a branch instead of a |
| // call. The code is the same except for one bit of the last instruction. |
| if (Fn != (void*)(intptr_t)PPC32CompilationCallback && |
| Fn != (void*)(intptr_t)PPC64CompilationCallback) { |
| JCE.startGVStub(F, 7*4); |
| intptr_t Addr = (intptr_t)JCE.getCurrentPCValue(); |
| JCE.emitWordBE(0); |
| JCE.emitWordBE(0); |
| JCE.emitWordBE(0); |
| JCE.emitWordBE(0); |
| JCE.emitWordBE(0); |
| JCE.emitWordBE(0); |
| JCE.emitWordBE(0); |
| EmitBranchToAt(Addr, (intptr_t)Fn, false, is64Bit); |
| sys::Memory::InvalidateInstructionCache((void*)Addr, 7*4); |
| return JCE.finishGVStub(F); |
| } |
| |
| JCE.startGVStub(F, 10*4); |
| intptr_t Addr = (intptr_t)JCE.getCurrentPCValue(); |
| if (is64Bit) { |
| JCE.emitWordBE(0xf821ffb1); // stdu r1,-80(r1) |
| JCE.emitWordBE(0x7d6802a6); // mflr r11 |
| JCE.emitWordBE(0xf9610060); // std r11, 96(r1) |
| } else if (TM.getSubtargetImpl()->isDarwinABI()){ |
| JCE.emitWordBE(0x9421ffe0); // stwu r1,-32(r1) |
| JCE.emitWordBE(0x7d6802a6); // mflr r11 |
| JCE.emitWordBE(0x91610028); // stw r11, 40(r1) |
| } else { |
| JCE.emitWordBE(0x9421ffe0); // stwu r1,-32(r1) |
| JCE.emitWordBE(0x7d6802a6); // mflr r11 |
| JCE.emitWordBE(0x91610024); // stw r11, 36(r1) |
| } |
| intptr_t BranchAddr = (intptr_t)JCE.getCurrentPCValue(); |
| JCE.emitWordBE(0); |
| JCE.emitWordBE(0); |
| JCE.emitWordBE(0); |
| JCE.emitWordBE(0); |
| JCE.emitWordBE(0); |
| JCE.emitWordBE(0); |
| JCE.emitWordBE(0); |
| EmitBranchToAt(BranchAddr, (intptr_t)Fn, true, is64Bit); |
| sys::Memory::InvalidateInstructionCache((void*)Addr, 10*4); |
| return JCE.finishGVStub(F); |
| } |
| |
| |
| void PPCJITInfo::relocate(void *Function, MachineRelocation *MR, |
| unsigned NumRelocs, unsigned char* GOTBase) { |
| for (unsigned i = 0; i != NumRelocs; ++i, ++MR) { |
| unsigned *RelocPos = (unsigned*)Function + MR->getMachineCodeOffset()/4; |
| intptr_t ResultPtr = (intptr_t)MR->getResultPointer(); |
| switch ((PPC::RelocationType)MR->getRelocationType()) { |
| default: llvm_unreachable("Unknown relocation type!"); |
| case PPC::reloc_pcrel_bx: |
| // PC-relative relocation for b and bl instructions. |
| ResultPtr = (ResultPtr-(intptr_t)RelocPos) >> 2; |
| assert(ResultPtr >= -(1 << 23) && ResultPtr < (1 << 23) && |
| "Relocation out of range!"); |
| *RelocPos |= (ResultPtr & ((1 << 24)-1)) << 2; |
| break; |
| case PPC::reloc_pcrel_bcx: |
| // PC-relative relocation for BLT,BLE,BEQ,BGE,BGT,BNE, or other |
| // bcx instructions. |
| ResultPtr = (ResultPtr-(intptr_t)RelocPos) >> 2; |
| assert(ResultPtr >= -(1 << 13) && ResultPtr < (1 << 13) && |
| "Relocation out of range!"); |
| *RelocPos |= (ResultPtr & ((1 << 14)-1)) << 2; |
| break; |
| case PPC::reloc_absolute_high: // high bits of ref -> low 16 of instr |
| case PPC::reloc_absolute_low: { // low bits of ref -> low 16 of instr |
| ResultPtr += MR->getConstantVal(); |
| |
| // If this is a high-part access, get the high-part. |
| if (MR->getRelocationType() == PPC::reloc_absolute_high) { |
| // If the low part will have a carry (really a borrow) from the low |
| // 16-bits into the high 16, add a bit to borrow from. |
| if (((int)ResultPtr << 16) < 0) |
| ResultPtr += 1 << 16; |
| ResultPtr >>= 16; |
| } |
| |
| // Do the addition then mask, so the addition does not overflow the 16-bit |
| // immediate section of the instruction. |
| unsigned LowBits = (*RelocPos + ResultPtr) & 65535; |
| unsigned HighBits = *RelocPos & ~65535; |
| *RelocPos = LowBits | HighBits; // Slam into low 16-bits |
| break; |
| } |
| case PPC::reloc_absolute_low_ix: { // low bits of ref -> low 14 of instr |
| ResultPtr += MR->getConstantVal(); |
| // Do the addition then mask, so the addition does not overflow the 16-bit |
| // immediate section of the instruction. |
| unsigned LowBits = (*RelocPos + ResultPtr) & 0xFFFC; |
| unsigned HighBits = *RelocPos & 0xFFFF0003; |
| *RelocPos = LowBits | HighBits; // Slam into low 14-bits. |
| break; |
| } |
| } |
| } |
| } |
| |
| void PPCJITInfo::replaceMachineCodeForFunction(void *Old, void *New) { |
| EmitBranchToAt((intptr_t)Old, (intptr_t)New, false, is64Bit); |
| } |
