X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FX86%2FX86JITInfo.cpp;h=d36f87a0801dea32f68073d517e3906c51042c68;hb=ec2e4679fd06c1a31f04f2f312f87d924ce43957;hp=9aa10d58483e43d36d840fc528f9ed5116346eaf;hpb=ec90cd1bf8f905e7befbb5049afbd1304dbfe13b;p=oota-llvm.git diff --git a/lib/Target/X86/X86JITInfo.cpp b/lib/Target/X86/X86JITInfo.cpp index 9aa10d58483..d36f87a0801 100644 --- a/lib/Target/X86/X86JITInfo.cpp +++ b/lib/Target/X86/X86JITInfo.cpp @@ -2,8 +2,8 @@ // // 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 is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // @@ -15,14 +15,18 @@ #include "X86JITInfo.h" #include "X86Relocations.h" #include "X86Subtarget.h" -#include "llvm/CodeGen/MachineCodeEmitter.h" -#include "llvm/Config/alloca.h" +#include "llvm/Function.h" +#include "llvm/Support/Compiler.h" +#include "llvm/Support/ErrorHandling.h" #include +#include using namespace llvm; -#ifdef _MSC_VER - extern "C" void *_AddressOfReturnAddress(void); - #pragma intrinsic(_AddressOfReturnAddress) +// 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) { @@ -47,38 +51,69 @@ static TargetJITInfo::JITCompilerFn JITCompilerFunction; #define GETASMPREFIX(X) GETASMPREFIX2(X) #define ASMPREFIX GETASMPREFIX(__USER_LABEL_PREFIX__) +// Check if building with -fPIC +#if defined(__PIC__) && __PIC__ && defined(__linux__) +#define ASMCALLSUFFIX "@PLT" +#else +#define ASMCALLSUFFIX +#endif + +// 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 X86CompilationCallback2 that saves non-traditional // callee saved registers, for the fastcc calling convention. extern "C" { -#if defined(__x86_64__) +#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_startproc\n" + CFI(".cfi_startproc\n") // Save RBP "pushq %rbp\n" -// ".cfi_def_cfa_offset 16\n" -// ".cfi_offset %rbp, -16\n" + CFI(".cfi_def_cfa_offset 16\n") + CFI(".cfi_offset %rbp, -16\n") // Save RSP "movq %rsp, %rbp\n" -// ".cfi_def_cfa_register %rbp\n" + CFI(".cfi_def_cfa_register %rbp\n") // Save all int arg registers "pushq %rdi\n" -// ".cfi_rel_offset %rdi, 0\n" + CFI(".cfi_rel_offset %rdi, 0\n") "pushq %rsi\n" -// ".cfi_rel_offset %rsi, 8\n" + CFI(".cfi_rel_offset %rsi, 8\n") "pushq %rdx\n" -// ".cfi_rel_offset %rdx, 16\n" + CFI(".cfi_rel_offset %rdx, 16\n") "pushq %rcx\n" -// ".cfi_rel_offset %rcx, 24\n" + CFI(".cfi_rel_offset %rcx, 24\n") "pushq %r8\n" -// ".cfi_rel_offset %r8, 32\n" + CFI(".cfi_rel_offset %r8, 32\n") "pushq %r9\n" -// ".cfi_rel_offset %r9, 40\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" @@ -95,7 +130,7 @@ extern "C" { // JIT callee "movq %rbp, %rdi\n" // Pass prev frame and return address "movq 8(%rbp), %rsi\n" - "call " ASMPREFIX "X86CompilationCallback2\n" + "call " ASMPREFIX "X86CompilationCallback2" ASMCALLSUFFIX "\n" // Restore all XMM arg registers "movaps 112(%rsp), %xmm7\n" "movaps 96(%rsp), %xmm6\n" @@ -107,102 +142,112 @@ extern "C" { "movaps (%rsp), %xmm0\n" // Restore RSP "movq %rbp, %rsp\n" -// ".cfi_def_cfa_register esp\n" + CFI(".cfi_def_cfa_register %rsp\n") // Restore all int arg registers "subq $48, %rsp\n" -// ".cfi_adjust_cfa_offset 48\n" + CFI(".cfi_adjust_cfa_offset 48\n") "popq %r9\n" -// ".cfi_adjust_cfa_offset -8\n" -// ".cfi_restore %r9\n" + CFI(".cfi_adjust_cfa_offset -8\n") + CFI(".cfi_restore %r9\n") "popq %r8\n" -// ".cfi_adjust_cfa_offset -8\n" -// ".cfi_restore %r8\n" + CFI(".cfi_adjust_cfa_offset -8\n") + CFI(".cfi_restore %r8\n") "popq %rcx\n" -// ".cfi_adjust_cfa_offset -8\n" -// ".cfi_restore %rcx\n" + CFI(".cfi_adjust_cfa_offset -8\n") + CFI(".cfi_restore %rcx\n") "popq %rdx\n" -// ".cfi_adjust_cfa_offset -8\n" -// ".cfi_restore %rdx\n" + CFI(".cfi_adjust_cfa_offset -8\n") + CFI(".cfi_restore %rdx\n") "popq %rsi\n" -// ".cfi_adjust_cfa_offset -8\n" -// ".cfi_restore %rsi\n" + CFI(".cfi_adjust_cfa_offset -8\n") + CFI(".cfi_restore %rsi\n") "popq %rdi\n" -// ".cfi_adjust_cfa_offset -8\n" -// ".cfi_restore %rdi\n" + CFI(".cfi_adjust_cfa_offset -8\n") + CFI(".cfi_restore %rdi\n") // Restore RBP "popq %rbp\n" -// ".cfi_adjust_cfa_offset -8\n" -// ".cfi_restore %rbp\n" + CFI(".cfi_adjust_cfa_offset -8\n") + CFI(".cfi_restore %rbp\n") "ret\n" -// ".cfi_endproc\n" - ); -#elif defined(__i386__) || defined(i386) || defined(_M_IX86) -#ifndef _MSC_VER + 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" + ".globl " ASMPREFIX "X86CompilationCallback\n" + TYPE_FUNCTION(X86CompilationCallback) ASMPREFIX "X86CompilationCallback:\n" -// ".cfi_startproc\n" + CFI(".cfi_startproc\n") "pushl %ebp\n" -// ".cfi_def_cfa_offset 8\n" -// ".cfi_offset %ebp, -8\n" + CFI(".cfi_def_cfa_offset 8\n") + CFI(".cfi_offset %ebp, -8\n") "movl %esp, %ebp\n" // Standard prologue -// ".cfi_def_cfa_register %ebp\n" + CFI(".cfi_def_cfa_register %ebp\n") "pushl %eax\n" -// ".cfi_rel_offset %eax, 0\n" + CFI(".cfi_rel_offset %eax, 0\n") "pushl %edx\n" // Save EAX/EDX/ECX -// ".cfi_rel_offset %edx, 4\n" + CFI(".cfi_rel_offset %edx, 4\n") "pushl %ecx\n" -// ".cfi_rel_offset %ecx, 8\n" -#if defined(__APPLE__) + CFI(".cfi_rel_offset %ecx, 8\n") +# if defined(__APPLE__) "andl $-16, %esp\n" // Align ESP on 16-byte boundary -#endif +# 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 "X86CompilationCallback2\n" + "call " ASMPREFIX "X86CompilationCallback2" ASMCALLSUFFIX "\n" "movl %ebp, %esp\n" // Restore ESP -// ".cfi_def_cfa_register %esp\n" + CFI(".cfi_def_cfa_register %esp\n") "subl $12, %esp\n" -// ".cfi_adjust_cfa_offset 12\n" + CFI(".cfi_adjust_cfa_offset 12\n") "popl %ecx\n" -// ".cfi_adjust_cfa_offset -4\n" -// ".cfi_restore %ecx\n" + CFI(".cfi_adjust_cfa_offset -4\n") + CFI(".cfi_restore %ecx\n") "popl %edx\n" -// ".cfi_adjust_cfa_offset -4\n" -// ".cfi_restore %edx\n" + CFI(".cfi_adjust_cfa_offset -4\n") + CFI(".cfi_restore %edx\n") "popl %eax\n" -// ".cfi_adjust_cfa_offset -4\n" -// ".cfi_restore %eax\n" + CFI(".cfi_adjust_cfa_offset -4\n") + CFI(".cfi_restore %eax\n") "popl %ebp\n" -// ".cfi_adjust_cfa_offset -4\n" -// ".cfi_restore %ebp\n" + CFI(".cfi_adjust_cfa_offset -4\n") + CFI(".cfi_restore %ebp\n") "ret\n" -// ".cfi_endproc\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" + ".globl " ASMPREFIX "X86CompilationCallback_SSE\n" + TYPE_FUNCTION(X86CompilationCallback_SSE) ASMPREFIX "X86CompilationCallback_SSE:\n" -// ".cfi_startproc\n" + CFI(".cfi_startproc\n") "pushl %ebp\n" -// ".cfi_def_cfa_offset 8\n" -// ".cfi_offset %ebp, -8\n" + CFI(".cfi_def_cfa_offset 8\n") + CFI(".cfi_offset %ebp, -8\n") "movl %esp, %ebp\n" // Standard prologue -// ".cfi_def_cfa_register %ebp\n" + CFI(".cfi_def_cfa_register %ebp\n") "pushl %eax\n" -// ".cfi_rel_offset %eax, 0\n" + CFI(".cfi_rel_offset %eax, 0\n") "pushl %edx\n" // Save EAX/EDX/ECX -// ".cfi_rel_offset %edx, 4\n" + CFI(".cfi_rel_offset %edx, 4\n") "pushl %ecx\n" -// ".cfi_rel_offset %ecx, 8\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" @@ -217,74 +262,77 @@ extern "C" { "movl 4(%ebp), %eax\n" // Pass prev frame and return address "movl %eax, 4(%esp)\n" "movl %ebp, (%esp)\n" - "call " ASMPREFIX "X86CompilationCallback2\n" + "call " ASMPREFIX "X86CompilationCallback2" ASMCALLSUFFIX "\n" "addl $16, %esp\n" "movaps 48(%esp), %xmm3\n" -// ".cfi_restore %xmm3\n" + CFI(".cfi_restore %xmm3\n") "movaps 32(%esp), %xmm2\n" -// ".cfi_restore %xmm2\n" + CFI(".cfi_restore %xmm2\n") "movaps 16(%esp), %xmm1\n" -// ".cfi_restore %xmm1\n" + CFI(".cfi_restore %xmm1\n") "movaps (%esp), %xmm0\n" -// ".cfi_restore %xmm0\n" + CFI(".cfi_restore %xmm0\n") "movl %ebp, %esp\n" // Restore ESP -// ".cfi_def_cfa_register esp\n" + CFI(".cfi_def_cfa_register esp\n") "subl $12, %esp\n" -// ".cfi_adjust_cfa_offset 12\n" + CFI(".cfi_adjust_cfa_offset 12\n") "popl %ecx\n" -// ".cfi_adjust_cfa_offset -4\n" -// ".cfi_restore %ecx\n" + CFI(".cfi_adjust_cfa_offset -4\n") + CFI(".cfi_restore %ecx\n") "popl %edx\n" -// ".cfi_adjust_cfa_offset -4\n" -// ".cfi_restore %edx\n" + CFI(".cfi_adjust_cfa_offset -4\n") + CFI(".cfi_restore %edx\n") "popl %eax\n" -// ".cfi_adjust_cfa_offset -4\n" -// ".cfi_restore %eax\n" + CFI(".cfi_adjust_cfa_offset -4\n") + CFI(".cfi_restore %eax\n") "popl %ebp\n" -// ".cfi_adjust_cfa_offset -4\n" -// ".cfi_restore %ebp\n" + CFI(".cfi_adjust_cfa_offset -4\n") + CFI(".cfi_restore %ebp\n") "ret\n" -// ".cfi_endproc\n" - ); -#else - void X86CompilationCallback2(void); + CFI(".cfi_endproc\n") + SIZE(X86CompilationCallback_SSE) + ); +# else + void X86CompilationCallback2(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 + mov eax, dword ptr [ebp+4] + mov dword ptr [esp+4], eax + mov dword ptr [esp], ebp call X86CompilationCallback2 + mov esp, ebp + sub esp, 12 pop ecx pop edx pop eax + pop ebp ret } } -#endif // _MSC_VER + +# endif // _MSC_VER #else // Not an i386 host void X86CompilationCallback() { - assert(0 && "Cannot call X86CompilationCallback() on a non-x86 arch!\n"); - abort(); + llvm_unreachable("Cannot call X86CompilationCallback() on a non-x86 arch!"); } #endif } -/// X86CompilationCallback - This is the target-specific function invoked by the +/// X86CompilationCallback2 - 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. -#ifdef _MSC_VER -extern "C" void X86CompilationCallback2() { - assert(sizeof(size_t) == 4); // FIXME: handle Win64 - intptr_t *RetAddrLoc = (intptr_t *)_AddressOfReturnAddress(); - RetAddrLoc += 4; // skip over ret addr, edx, eax, ecx - intptr_t RetAddr = *RetAddrLoc; -#else -extern "C" void X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr) { +extern "C" void ATTRIBUTE_USED +X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr) { intptr_t *RetAddrLoc = &StackPtr[1]; -#endif assert(*RetAddrLoc == RetAddr && "Could not find return address on the stack!"); @@ -292,21 +340,21 @@ extern "C" void X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr) { bool isStub = ((unsigned char*)RetAddr)[0] == 0xCD; // The call instruction should have pushed the return value onto the stack... -#ifdef __x86_64__ +#if defined (X86_64_JIT) RetAddr--; // Backtrack to the reference itself... #else RetAddr -= 4; // Backtrack to the reference itself... #endif #if 0 - DOUT << "In callback! Addr=" << (void*)RetAddr - << " ESP=" << (void*)StackPtr - << ": Resolving call to function: " - << TheVM->getFunctionReferencedName((void*)RetAddr) << "\n"; + DEBUG(errs() << "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. -#ifdef __x86_64__ +#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 @@ -317,8 +365,9 @@ extern "C" void X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr) { // Rewrite the call target... so that we don't end up here every time we // execute the call. -#ifdef __x86_64__ - *(intptr_t *)(RetAddr - 0xa) = NewVal; +#if defined (X86_64_JIT) + if (!isStub) + *(intptr_t *)(RetAddr - 0xa) = NewVal; #else *(intptr_t *)RetAddr = (intptr_t)(NewVal-RetAddr-4); #endif @@ -328,15 +377,26 @@ extern "C" void X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr) { // instruction so that two return addresses are not pushed onto the stack // when the requested function finally gets called. This also makes the // 0xCD byte (interrupt) dead, so the marker doesn't effect anything. -#ifdef __x86_64__ - ((unsigned char*)RetAddr)[0] = (2 | (4 << 3) | (3 << 6)); +#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)); + } #else ((unsigned char*)RetAddr)[-1] = 0xE9; #endif } // Change the return address to reexecute the call instruction... -#ifdef __x86_64__ +#if defined (X86_64_JIT) *RetAddrLoc -= 0xd; #else *RetAddrLoc -= 5; @@ -347,8 +407,7 @@ TargetJITInfo::LazyResolverFn X86JITInfo::getLazyResolverFunction(JITCompilerFn F) { JITCompilerFunction = F; -#if (defined(__i386__) || defined(i386) || defined(_M_IX86)) && \ - !defined(_MSC_VER) && !defined(__x86_64__) +#if defined (X86_32_JIT) && !defined (_MSC_VER) unsigned EAX = 0, EBX = 0, ECX = 0, EDX = 0; union { unsigned u[3]; @@ -368,52 +427,92 @@ X86JITInfo::getLazyResolverFunction(JITCompilerFn F) { return X86CompilationCallback; } -void *X86JITInfo::emitFunctionStub(void *Fn, MachineCodeEmitter &MCE) { +void *X86JITInfo::emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr, + JITCodeEmitter &JCE) { +#if defined (X86_64_JIT) + JCE.startGVStub(GV, 8, 8); + JCE.emitWordLE((unsigned)(intptr_t)ptr); + JCE.emitWordLE((unsigned)(((intptr_t)ptr) >> 32)); +#else + JCE.startGVStub(GV, 4, 4); + JCE.emitWordLE((intptr_t)ptr); +#endif + return JCE.finishGVStub(GV); +} + +void *X86JITInfo::emitFunctionStub(const Function* F, void *Fn, + 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(__i386__) || defined(i386) || defined(_M_IX86)) && \ - !defined(_MSC_VER) && !defined(__x86_64__) +#if defined (X86_32_JIT) && !defined (_MSC_VER) bool NotCC = (Fn != (void*)(intptr_t)X86CompilationCallback && Fn != (void*)(intptr_t)X86CompilationCallback_SSE); #else bool NotCC = Fn != (void*)(intptr_t)X86CompilationCallback; #endif if (NotCC) { -#ifdef __x86_64__ - MCE.startFunctionStub(13, 4); - MCE.emitByte(0x49); // REX prefix - MCE.emitByte(0xB8+2); // movabsq r10 - MCE.emitWordLE(((unsigned *)&Fn)[0]); - MCE.emitWordLE(((unsigned *)&Fn)[1]); - MCE.emitByte(0x41); // REX prefix - MCE.emitByte(0xFF); // jmpq *r10 - MCE.emitByte(2 | (4 << 3) | (3 << 6)); +#if defined (X86_64_JIT) + JCE.startGVStub(F, 13, 4); + JCE.emitByte(0x49); // REX prefix + JCE.emitByte(0xB8+2); // movabsq r10 + JCE.emitWordLE((unsigned)(intptr_t)Fn); + JCE.emitWordLE((unsigned)(((intptr_t)Fn) >> 32)); + JCE.emitByte(0x41); // REX prefix + JCE.emitByte(0xFF); // jmpq *r10 + JCE.emitByte(2 | (4 << 3) | (3 << 6)); #else - MCE.startFunctionStub(5, 4); - MCE.emitByte(0xE9); - MCE.emitWordLE((intptr_t)Fn-MCE.getCurrentPCValue()-4); + JCE.startGVStub(F, 5, 4); + JCE.emitByte(0xE9); + JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4); #endif - return MCE.finishFunctionStub(0); + return JCE.finishGVStub(F); } -#ifdef __x86_64__ - MCE.startFunctionStub(14, 4); - MCE.emitByte(0x49); // REX prefix - MCE.emitByte(0xB8+2); // movabsq r10 - MCE.emitWordLE(((unsigned *)&Fn)[0]); - MCE.emitWordLE(((unsigned *)&Fn)[1]); - MCE.emitByte(0x41); // REX prefix - MCE.emitByte(0xFF); // callq *r10 - MCE.emitByte(2 | (2 << 3) | (3 << 6)); +#if defined (X86_64_JIT) + JCE.startGVStub(F, 14, 4); + JCE.emitByte(0x49); // REX prefix + JCE.emitByte(0xB8+2); // movabsq r10 + JCE.emitWordLE((unsigned)(intptr_t)Fn); + JCE.emitWordLE((unsigned)(((intptr_t)Fn) >> 32)); + JCE.emitByte(0x41); // REX prefix + JCE.emitByte(0xFF); // callq *r10 + JCE.emitByte(2 | (2 << 3) | (3 << 6)); #else - MCE.startFunctionStub(6, 4); - MCE.emitByte(0xE8); // Call with 32 bit pc-rel destination... + JCE.startGVStub(F, 6, 4); + JCE.emitByte(0xE8); // Call with 32 bit pc-rel destination... + + JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4); +#endif + + JCE.emitByte(0xCD); // Interrupt - Just a marker identifying the stub! + return JCE.finishGVStub(F); +} - MCE.emitWordLE((intptr_t)Fn-MCE.getCurrentPCValue()-4); +void X86JITInfo::emitFunctionStubAtAddr(const Function* F, void *Fn, void *Stub, + 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. + JCE.startGVStub(F, Stub, 5); + JCE.emitByte(0xE9); +#if defined (X86_64_JIT) && !defined (NDEBUG) + // Yes, we need both of these casts, or some broken versions of GCC (4.2.4) + // get the signed-ness of the expression wrong. Go figure. + intptr_t Displacement = (intptr_t)Fn - (intptr_t)JCE.getCurrentPCValue() - 5; + assert(((Displacement << 32) >> 32) == Displacement + && "PIC displacement does not fit in displacement field!"); #endif + JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4); + JCE.finishGVStub(F); +} - MCE.emitByte(0xCD); // Interrupt - Just a marker identifying the stub! - return MCE.finishFunctionStub(0); +/// 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 } /// relocate - Before the JIT can run a block of code that has been emitted, @@ -428,11 +527,19 @@ void X86JITInfo::relocate(void *Function, MachineRelocation *MR, 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(); + ResultPtr = ResultPtr -(intptr_t)RelocPos - 4 - MR->getConstantVal(); + *((unsigned*)RelocPos) += (unsigned)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()); *((unsigned*)RelocPos) += (unsigned)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. *((unsigned*)RelocPos) += (unsigned)ResultPtr; @@ -443,3 +550,13 @@ void X86JITInfo::relocate(void *Function, MachineRelocation *MR, } } } + +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!"); + return 0; +#endif +}