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Diffstat (limited to 'lib/Target/X86/X86JITInfo.cpp')
| -rw-r--r-- | lib/Target/X86/X86JITInfo.cpp | 588 |
1 files changed, 0 insertions, 588 deletions
diff --git a/lib/Target/X86/X86JITInfo.cpp b/lib/Target/X86/X86JITInfo.cpp deleted file mode 100644 index a082c4f..0000000 --- a/lib/Target/X86/X86JITInfo.cpp +++ /dev/null @@ -1,588 +0,0 @@ -//===-- X86JITInfo.cpp - Implement the JIT interfaces for the X86 target --===// -// -// 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 X86 target. -// -//===----------------------------------------------------------------------===// - -#include "X86JITInfo.h" -#include "X86Relocations.h" -#include "X86Subtarget.h" -#include "X86TargetMachine.h" -#include "llvm/IR/Function.h" -#include "llvm/Support/Compiler.h" -#include "llvm/Support/ErrorHandling.h" -#include "llvm/Support/Valgrind.h" -#include <cstdlib> -#include <cstring> -using namespace llvm; - -#define DEBUG_TYPE "jit" - -// Determine the platform we're running on -#if defined (__x86_64__) || defined (_M_AMD64) || defined (_M_X64) -# define X86_64_JIT -#elif defined(__i386__) || defined(i386) || defined(_M_IX86) -# define X86_32_JIT -#endif - -void X86JITInfo::replaceMachineCodeForFunction(void *Old, void *New) { - unsigned char *OldByte = (unsigned char *)Old; - *OldByte++ = 0xE9; // Emit JMP opcode. - unsigned *OldWord = (unsigned *)OldByte; - unsigned NewAddr = (intptr_t)New; - unsigned OldAddr = (intptr_t)OldWord; - *OldWord = NewAddr - OldAddr - 4; // Emit PC-relative addr of New code. - - // X86 doesn't need to invalidate the processor cache, so just invalidate - // Valgrind's cache directly. - sys::ValgrindDiscardTranslations(Old, 5); -} - - -/// JITCompilerFunction - This contains the address of the JIT function used to -/// compile a function lazily. -static TargetJITInfo::JITCompilerFn JITCompilerFunction; - -// Get the ASMPREFIX for the current host. This is often '_'. -#ifndef __USER_LABEL_PREFIX__ -#define __USER_LABEL_PREFIX__ -#endif -#define GETASMPREFIX2(X) #X -#define GETASMPREFIX(X) GETASMPREFIX2(X) -#define ASMPREFIX GETASMPREFIX(__USER_LABEL_PREFIX__) - -// For ELF targets, use a .size and .type directive, to let tools -// know the extent of functions defined in assembler. -#if defined(__ELF__) -# define SIZE(sym) ".size " #sym ", . - " #sym "\n" -# define TYPE_FUNCTION(sym) ".type " #sym ", @function\n" -#else -# define SIZE(sym) -# define TYPE_FUNCTION(sym) -#endif - -// Provide a convenient way for disabling usage of CFI directives. -// This is needed for old/broken assemblers (for example, gas on -// Darwin is pretty old and doesn't support these directives) -#if defined(__APPLE__) -# define CFI(x) -#else -// FIXME: Disable this until we really want to use it. Also, we will -// need to add some workarounds for compilers, which support -// only subset of these directives. -# define CFI(x) -#endif - -// Provide a wrapper for LLVMX86CompilationCallback2 that saves non-traditional -// callee saved registers, for the fastcc calling convention. -extern "C" { -#if defined(X86_64_JIT) -# ifndef _MSC_VER - // No need to save EAX/EDX for X86-64. - void X86CompilationCallback(void); - asm( - ".text\n" - ".align 8\n" - ".globl " ASMPREFIX "X86CompilationCallback\n" - TYPE_FUNCTION(X86CompilationCallback) - ASMPREFIX "X86CompilationCallback:\n" - CFI(".cfi_startproc\n") - // Save RBP - "pushq %rbp\n" - CFI(".cfi_def_cfa_offset 16\n") - CFI(".cfi_offset %rbp, -16\n") - // Save RSP - "movq %rsp, %rbp\n" - CFI(".cfi_def_cfa_register %rbp\n") - // Save all int arg registers - "pushq %rdi\n" - CFI(".cfi_rel_offset %rdi, 0\n") - "pushq %rsi\n" - CFI(".cfi_rel_offset %rsi, 8\n") - "pushq %rdx\n" - CFI(".cfi_rel_offset %rdx, 16\n") - "pushq %rcx\n" - CFI(".cfi_rel_offset %rcx, 24\n") - "pushq %r8\n" - CFI(".cfi_rel_offset %r8, 32\n") - "pushq %r9\n" - CFI(".cfi_rel_offset %r9, 40\n") - // Align stack on 16-byte boundary. ESP might not be properly aligned - // (8 byte) if this is called from an indirect stub. - "andq $-16, %rsp\n" - // Save all XMM arg registers - "subq $128, %rsp\n" - "movaps %xmm0, (%rsp)\n" - "movaps %xmm1, 16(%rsp)\n" - "movaps %xmm2, 32(%rsp)\n" - "movaps %xmm3, 48(%rsp)\n" - "movaps %xmm4, 64(%rsp)\n" - "movaps %xmm5, 80(%rsp)\n" - "movaps %xmm6, 96(%rsp)\n" - "movaps %xmm7, 112(%rsp)\n" - // JIT callee -#if defined(_WIN64) || defined(__CYGWIN__) - "subq $32, %rsp\n" - "movq %rbp, %rcx\n" // Pass prev frame and return address - "movq 8(%rbp), %rdx\n" - "call " ASMPREFIX "LLVMX86CompilationCallback2\n" - "addq $32, %rsp\n" -#else - "movq %rbp, %rdi\n" // Pass prev frame and return address - "movq 8(%rbp), %rsi\n" - "call " ASMPREFIX "LLVMX86CompilationCallback2\n" -#endif - // Restore all XMM arg registers - "movaps 112(%rsp), %xmm7\n" - "movaps 96(%rsp), %xmm6\n" - "movaps 80(%rsp), %xmm5\n" - "movaps 64(%rsp), %xmm4\n" - "movaps 48(%rsp), %xmm3\n" - "movaps 32(%rsp), %xmm2\n" - "movaps 16(%rsp), %xmm1\n" - "movaps (%rsp), %xmm0\n" - // Restore RSP - "movq %rbp, %rsp\n" - CFI(".cfi_def_cfa_register %rsp\n") - // Restore all int arg registers - "subq $48, %rsp\n" - CFI(".cfi_adjust_cfa_offset 48\n") - "popq %r9\n" - CFI(".cfi_adjust_cfa_offset -8\n") - CFI(".cfi_restore %r9\n") - "popq %r8\n" - CFI(".cfi_adjust_cfa_offset -8\n") - CFI(".cfi_restore %r8\n") - "popq %rcx\n" - CFI(".cfi_adjust_cfa_offset -8\n") - CFI(".cfi_restore %rcx\n") - "popq %rdx\n" - CFI(".cfi_adjust_cfa_offset -8\n") - CFI(".cfi_restore %rdx\n") - "popq %rsi\n" - CFI(".cfi_adjust_cfa_offset -8\n") - CFI(".cfi_restore %rsi\n") - "popq %rdi\n" - CFI(".cfi_adjust_cfa_offset -8\n") - CFI(".cfi_restore %rdi\n") - // Restore RBP - "popq %rbp\n" - CFI(".cfi_adjust_cfa_offset -8\n") - CFI(".cfi_restore %rbp\n") - "ret\n" - CFI(".cfi_endproc\n") - SIZE(X86CompilationCallback) - ); -# else - // No inline assembler support on this platform. The routine is in external - // file. - void X86CompilationCallback(); - -# endif -#elif defined (X86_32_JIT) -# ifndef _MSC_VER - void X86CompilationCallback(void); - asm( - ".text\n" - ".align 8\n" - ".globl " ASMPREFIX "X86CompilationCallback\n" - TYPE_FUNCTION(X86CompilationCallback) - ASMPREFIX "X86CompilationCallback:\n" - CFI(".cfi_startproc\n") - "pushl %ebp\n" - CFI(".cfi_def_cfa_offset 8\n") - CFI(".cfi_offset %ebp, -8\n") - "movl %esp, %ebp\n" // Standard prologue - CFI(".cfi_def_cfa_register %ebp\n") - "pushl %eax\n" - CFI(".cfi_rel_offset %eax, 0\n") - "pushl %edx\n" // Save EAX/EDX/ECX - CFI(".cfi_rel_offset %edx, 4\n") - "pushl %ecx\n" - CFI(".cfi_rel_offset %ecx, 8\n") -# if defined(__APPLE__) - "andl $-16, %esp\n" // Align ESP on 16-byte boundary -# endif - "subl $16, %esp\n" - "movl 4(%ebp), %eax\n" // Pass prev frame and return address - "movl %eax, 4(%esp)\n" - "movl %ebp, (%esp)\n" - "call " ASMPREFIX "LLVMX86CompilationCallback2\n" - "movl %ebp, %esp\n" // Restore ESP - CFI(".cfi_def_cfa_register %esp\n") - "subl $12, %esp\n" - CFI(".cfi_adjust_cfa_offset 12\n") - "popl %ecx\n" - CFI(".cfi_adjust_cfa_offset -4\n") - CFI(".cfi_restore %ecx\n") - "popl %edx\n" - CFI(".cfi_adjust_cfa_offset -4\n") - CFI(".cfi_restore %edx\n") - "popl %eax\n" - CFI(".cfi_adjust_cfa_offset -4\n") - CFI(".cfi_restore %eax\n") - "popl %ebp\n" - CFI(".cfi_adjust_cfa_offset -4\n") - CFI(".cfi_restore %ebp\n") - "ret\n" - CFI(".cfi_endproc\n") - SIZE(X86CompilationCallback) - ); - - // Same as X86CompilationCallback but also saves XMM argument registers. - void X86CompilationCallback_SSE(void); - asm( - ".text\n" - ".align 8\n" - ".globl " ASMPREFIX "X86CompilationCallback_SSE\n" - TYPE_FUNCTION(X86CompilationCallback_SSE) - ASMPREFIX "X86CompilationCallback_SSE:\n" - CFI(".cfi_startproc\n") - "pushl %ebp\n" - CFI(".cfi_def_cfa_offset 8\n") - CFI(".cfi_offset %ebp, -8\n") - "movl %esp, %ebp\n" // Standard prologue - CFI(".cfi_def_cfa_register %ebp\n") - "pushl %eax\n" - CFI(".cfi_rel_offset %eax, 0\n") - "pushl %edx\n" // Save EAX/EDX/ECX - CFI(".cfi_rel_offset %edx, 4\n") - "pushl %ecx\n" - CFI(".cfi_rel_offset %ecx, 8\n") - "andl $-16, %esp\n" // Align ESP on 16-byte boundary - // Save all XMM arg registers - "subl $64, %esp\n" - // FIXME: provide frame move information for xmm registers. - // This can be tricky, because CFA register is ebp (unaligned) - // and we need to produce offsets relative to it. - "movaps %xmm0, (%esp)\n" - "movaps %xmm1, 16(%esp)\n" - "movaps %xmm2, 32(%esp)\n" - "movaps %xmm3, 48(%esp)\n" - "subl $16, %esp\n" - "movl 4(%ebp), %eax\n" // Pass prev frame and return address - "movl %eax, 4(%esp)\n" - "movl %ebp, (%esp)\n" - "call " ASMPREFIX "LLVMX86CompilationCallback2\n" - "addl $16, %esp\n" - "movaps 48(%esp), %xmm3\n" - CFI(".cfi_restore %xmm3\n") - "movaps 32(%esp), %xmm2\n" - CFI(".cfi_restore %xmm2\n") - "movaps 16(%esp), %xmm1\n" - CFI(".cfi_restore %xmm1\n") - "movaps (%esp), %xmm0\n" - CFI(".cfi_restore %xmm0\n") - "movl %ebp, %esp\n" // Restore ESP - CFI(".cfi_def_cfa_register esp\n") - "subl $12, %esp\n" - CFI(".cfi_adjust_cfa_offset 12\n") - "popl %ecx\n" - CFI(".cfi_adjust_cfa_offset -4\n") - CFI(".cfi_restore %ecx\n") - "popl %edx\n" - CFI(".cfi_adjust_cfa_offset -4\n") - CFI(".cfi_restore %edx\n") - "popl %eax\n" - CFI(".cfi_adjust_cfa_offset -4\n") - CFI(".cfi_restore %eax\n") - "popl %ebp\n" - CFI(".cfi_adjust_cfa_offset -4\n") - CFI(".cfi_restore %ebp\n") - "ret\n" - CFI(".cfi_endproc\n") - SIZE(X86CompilationCallback_SSE) - ); -# else - void LLVMX86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr); - - _declspec(naked) void X86CompilationCallback(void) { - __asm { - push ebp - mov ebp, esp - push eax - push edx - push ecx - and esp, -16 - sub esp, 16 - mov eax, dword ptr [ebp+4] - mov dword ptr [esp+4], eax - mov dword ptr [esp], ebp - call LLVMX86CompilationCallback2 - mov esp, ebp - sub esp, 12 - pop ecx - pop edx - pop eax - pop ebp - ret - } - } - -# endif // _MSC_VER - -#else // Not an i386 host - void X86CompilationCallback() { - llvm_unreachable("Cannot call X86CompilationCallback() on a non-x86 arch!"); - } -#endif -} - -/// This is the target-specific function invoked by the -/// function stub when we did not know the real target of a call. This function -/// must locate the start of the stub or call site and pass it into the JIT -/// compiler function. -extern "C" { -LLVM_ATTRIBUTE_USED // Referenced from inline asm. -LLVM_LIBRARY_VISIBILITY void LLVMX86CompilationCallback2(intptr_t *StackPtr, - intptr_t RetAddr) { - intptr_t *RetAddrLoc = &StackPtr[1]; - // We are reading raw stack data here. Tell MemorySanitizer that it is - // sufficiently initialized. - __msan_unpoison(RetAddrLoc, sizeof(*RetAddrLoc)); - assert(*RetAddrLoc == RetAddr && - "Could not find return address on the stack!"); - - // It's a stub if there is an interrupt marker after the call. - bool isStub = ((unsigned char*)RetAddr)[0] == 0xCE; - - // The call instruction should have pushed the return value onto the stack... -#if defined (X86_64_JIT) - RetAddr--; // Backtrack to the reference itself... -#else - RetAddr -= 4; // Backtrack to the reference itself... -#endif - -#if 0 - DEBUG(dbgs() << "In callback! Addr=" << (void*)RetAddr - << " ESP=" << (void*)StackPtr - << ": Resolving call to function: " - << TheVM->getFunctionReferencedName((void*)RetAddr) << "\n"); -#endif - - // Sanity check to make sure this really is a call instruction. -#if defined (X86_64_JIT) - assert(((unsigned char*)RetAddr)[-2] == 0x41 &&"Not a call instr!"); - assert(((unsigned char*)RetAddr)[-1] == 0xFF &&"Not a call instr!"); -#else - assert(((unsigned char*)RetAddr)[-1] == 0xE8 &&"Not a call instr!"); -#endif - - intptr_t NewVal = (intptr_t)JITCompilerFunction((void*)RetAddr); - - // Rewrite the call target... so that we don't end up here every time we - // execute the call. -#if defined (X86_64_JIT) - assert(isStub && - "X86-64 doesn't support rewriting non-stub lazy compilation calls:" - " the call instruction varies too much."); -#else - *(intptr_t *)RetAddr = (intptr_t)(NewVal-RetAddr-4); -#endif - - if (isStub) { - // If this is a stub, rewrite the call into an unconditional branch - // instruction so that two return addresses are not pushed onto the stack - // when the requested function finally gets called. This also makes the - // 0xCE byte (interrupt) dead, so the marker doesn't effect anything. -#if defined (X86_64_JIT) - // If the target address is within 32-bit range of the stub, use a - // PC-relative branch instead of loading the actual address. (This is - // considerably shorter than the 64-bit immediate load already there.) - // We assume here intptr_t is 64 bits. - intptr_t diff = NewVal-RetAddr+7; - if (diff >= -2147483648LL && diff <= 2147483647LL) { - *(unsigned char*)(RetAddr-0xc) = 0xE9; - *(intptr_t *)(RetAddr-0xb) = diff & 0xffffffff; - } else { - *(intptr_t *)(RetAddr - 0xa) = NewVal; - ((unsigned char*)RetAddr)[0] = (2 | (4 << 3) | (3 << 6)); - } - sys::ValgrindDiscardTranslations((void*)(RetAddr-0xc), 0xd); -#else - ((unsigned char*)RetAddr)[-1] = 0xE9; - sys::ValgrindDiscardTranslations((void*)(RetAddr-1), 5); -#endif - } - - // Change the return address to reexecute the call instruction... -#if defined (X86_64_JIT) - *RetAddrLoc -= 0xd; -#else - *RetAddrLoc -= 5; -#endif -} -} - -TargetJITInfo::LazyResolverFn -X86JITInfo::getLazyResolverFunction(JITCompilerFn F) { - TsanIgnoreWritesBegin(); - JITCompilerFunction = F; - TsanIgnoreWritesEnd(); - -#if defined (X86_32_JIT) && !defined (_MSC_VER) -#if defined(__SSE__) - // SSE Callback should be called for SSE-enabled LLVM. - return X86CompilationCallback_SSE; -#else - if (useSSE) - return X86CompilationCallback_SSE; -#endif -#endif - - return X86CompilationCallback; -} - -X86JITInfo::X86JITInfo(bool UseSSE) { - useSSE = UseSSE; - useGOT = 0; - TLSOffset = nullptr; -} - -void *X86JITInfo::emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr, - JITCodeEmitter &JCE) { -#if defined (X86_64_JIT) - const unsigned Alignment = 8; - uint8_t Buffer[8]; - uint8_t *Cur = Buffer; - MachineCodeEmitter::emitWordLEInto(Cur, (unsigned)(intptr_t)ptr); - MachineCodeEmitter::emitWordLEInto(Cur, (unsigned)(((intptr_t)ptr) >> 32)); -#else - const unsigned Alignment = 4; - uint8_t Buffer[4]; - uint8_t *Cur = Buffer; - MachineCodeEmitter::emitWordLEInto(Cur, (intptr_t)ptr); -#endif - return JCE.allocIndirectGV(GV, Buffer, sizeof(Buffer), Alignment); -} - -TargetJITInfo::StubLayout X86JITInfo::getStubLayout() { - // The 64-bit stub contains: - // movabs r10 <- 8-byte-target-address # 10 bytes - // call|jmp *r10 # 3 bytes - // The 32-bit stub contains a 5-byte call|jmp. - // If the stub is a call to the compilation callback, an extra byte is added - // to mark it as a stub. - StubLayout Result = {14, 4}; - return Result; -} - -void *X86JITInfo::emitFunctionStub(const Function* F, void *Target, - JITCodeEmitter &JCE) { - // Note, we cast to intptr_t here to silence a -pedantic warning that - // complains about casting a function pointer to a normal pointer. -#if defined (X86_32_JIT) && !defined (_MSC_VER) - bool NotCC = (Target != (void*)(intptr_t)X86CompilationCallback && - Target != (void*)(intptr_t)X86CompilationCallback_SSE); -#else - bool NotCC = Target != (void*)(intptr_t)X86CompilationCallback; -#endif - JCE.emitAlignment(4); - void *Result = (void*)JCE.getCurrentPCValue(); - if (NotCC) { -#if defined (X86_64_JIT) - JCE.emitByte(0x49); // REX prefix - JCE.emitByte(0xB8+2); // movabsq r10 - JCE.emitWordLE((unsigned)(intptr_t)Target); - JCE.emitWordLE((unsigned)(((intptr_t)Target) >> 32)); - JCE.emitByte(0x41); // REX prefix - JCE.emitByte(0xFF); // jmpq *r10 - JCE.emitByte(2 | (4 << 3) | (3 << 6)); -#else - JCE.emitByte(0xE9); - JCE.emitWordLE((intptr_t)Target-JCE.getCurrentPCValue()-4); -#endif - return Result; - } - -#if defined (X86_64_JIT) - JCE.emitByte(0x49); // REX prefix - JCE.emitByte(0xB8+2); // movabsq r10 - JCE.emitWordLE((unsigned)(intptr_t)Target); - JCE.emitWordLE((unsigned)(((intptr_t)Target) >> 32)); - JCE.emitByte(0x41); // REX prefix - JCE.emitByte(0xFF); // callq *r10 - JCE.emitByte(2 | (2 << 3) | (3 << 6)); -#else - JCE.emitByte(0xE8); // Call with 32 bit pc-rel destination... - - JCE.emitWordLE((intptr_t)Target-JCE.getCurrentPCValue()-4); -#endif - - // This used to use 0xCD, but that value is used by JITMemoryManager to - // initialize the buffer with garbage, which means it may follow a - // noreturn function call, confusing LLVMX86CompilationCallback2. PR 4929. - JCE.emitByte(0xCE); // Interrupt - Just a marker identifying the stub! - return Result; -} - -/// getPICJumpTableEntry - Returns the value of the jumptable entry for the -/// specific basic block. -uintptr_t X86JITInfo::getPICJumpTableEntry(uintptr_t BB, uintptr_t Entry) { -#if defined(X86_64_JIT) - return BB - Entry; -#else - return BB - PICBase; -#endif -} - -template<typename T> static void addUnaligned(void *Pos, T Delta) { - T Value; - std::memcpy(reinterpret_cast<char*>(&Value), reinterpret_cast<char*>(Pos), - sizeof(T)); - Value += Delta; - std::memcpy(reinterpret_cast<char*>(Pos), reinterpret_cast<char*>(&Value), - sizeof(T)); -} - -/// 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 X86JITInfo::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 ((X86::RelocationType)MR->getRelocationType()) { - case X86::reloc_pcrel_word: { - // PC relative relocation, add the relocated value to the value already in - // memory, after we adjust it for where the PC is. - ResultPtr = ResultPtr -(intptr_t)RelocPos - 4 - MR->getConstantVal(); - addUnaligned<unsigned>(RelocPos, ResultPtr); - break; - } - case X86::reloc_picrel_word: { - // PIC base relative relocation, add the relocated value to the value - // already in memory, after we adjust it for where the PIC base is. - ResultPtr = ResultPtr - ((intptr_t)Function + MR->getConstantVal()); - addUnaligned<unsigned>(RelocPos, ResultPtr); - break; - } - case X86::reloc_absolute_word: - case X86::reloc_absolute_word_sext: - // Absolute relocation, just add the relocated value to the value already - // in memory. - addUnaligned<unsigned>(RelocPos, ResultPtr); - break; - case X86::reloc_absolute_dword: - addUnaligned<intptr_t>(RelocPos, ResultPtr); - break; - } - } -} - -char* X86JITInfo::allocateThreadLocalMemory(size_t size) { -#if defined(X86_32_JIT) && !defined(__APPLE__) && !defined(_MSC_VER) - TLSOffset -= size; - return TLSOffset; -#else - llvm_unreachable("Cannot allocate thread local storage on this arch!"); -#endif -} |