//
// 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.
//
//===----------------------------------------------------------------------===//
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "jit"
-#include <cstdlib>
#include "X86JITInfo.h"
#include "X86Relocations.h"
-#include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "X86Subtarget.h"
+#include "llvm/Function.h"
#include "llvm/Config/alloca.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/ErrorHandling.h"
+#include <cstdlib>
+#include <cstring>
using namespace llvm;
+// Determine the platform we're running on
+#if defined (__x86_64__) || defined (_M_AMD64)
+# 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.
/// 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__)
+
+// 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(__i386__) || defined(i386) || defined(_M_IX86)
-#ifndef _MSC_VER
+#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
+ "movq %rbp, %rdi\n" // Pass prev frame and return address
+ "movq 8(%rbp), %rsi\n"
+ "call " ASMPREFIX "X86CompilationCallback2" ASMCALLSUFFIX "\n"
+ // 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 X86CompilationCallback\n"
- "X86CompilationCallback:\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"
- "pushl %edx\n" // save EAX/EDX
- "call X86CompilationCallback2\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 "X86CompilationCallback2" ASMCALLSUFFIX "\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"
- "ret\n");
-#else
- extern "C" void *_AddressOfReturnAddress(void);
- #pragma intrinsic(_AddressOfReturnAddress)
+ CFI(".cfi_adjust_cfa_offset -4\n")
+ CFI(".cfi_restore %ebp\n")
+ "ret\n"
+ CFI(".cfi_endproc\n")
+ SIZE(X86CompilationCallback)
+ );
- void X86CompilationCallback2(void);
+ // 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 "X86CompilationCallback2" ASMCALLSUFFIX "\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 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() {
- std::cerr << "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.
-extern "C" void X86CompilationCallback2() {
-#ifdef _MSC_VER
- assert(sizeof(size_t) == 4); // FIXME: handle Win64
- unsigned *RetAddrLoc = (unsigned *)_AddressOfReturnAddress();
- RetAddrLoc += 3; // skip over ret addr, edx, eax
- unsigned RetAddr = *RetAddrLoc;
-#else
- unsigned *StackPtr = (unsigned*)__builtin_frame_address(1);
- unsigned RetAddr = (unsigned)(intptr_t)__builtin_return_address(1);
- unsigned *RetAddrLoc = &StackPtr[1];
-
- // NOTE: __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(10+(RetAddr >> 31));
-
-#endif
+extern "C" void ATTRIBUTE_USED
+X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr) {
+ intptr_t *RetAddrLoc = &StackPtr[1];
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*)(intptr_t)RetAddr)[0] == 0xCD;
+ bool isStub = ((unsigned char*)RetAddr)[0] == 0xCD;
// 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(std::cerr << "In callback! Addr=" << (void*)RetAddr
- << " ESP=" << (void*)StackPtr
- << ": Resolving call to function: "
- << TheVM->getFunctionReferencedName((void*)RetAddr) << "\n");
+ DOUT << "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.
- assert(((unsigned char*)(intptr_t)RetAddr)[-1] == 0xE8 &&"Not a call instr!");
+#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
- unsigned NewVal = (intptr_t)JITCompilerFunction((void*)(intptr_t)RetAddr);
+ 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.
- *(unsigned*)(intptr_t)RetAddr = NewVal-RetAddr-4;
+#if defined (X86_64_JIT)
+ if (!isStub)
+ *(intptr_t *)(RetAddr - 0xa) = NewVal;
+#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
// 0xCD byte (interrupt) dead, so the marker doesn't effect anything.
- ((unsigned char*)(intptr_t)RetAddr)[-1] = 0xE9;
+#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...
+#if defined (X86_64_JIT)
+ *RetAddrLoc -= 0xd;
+#else
*RetAddrLoc -= 5;
+#endif
}
TargetJITInfo::LazyResolverFn
X86JITInfo::getLazyResolverFunction(JITCompilerFn F) {
JITCompilerFunction = F;
+
+#if defined (X86_32_JIT) && !defined (_MSC_VER)
+ unsigned EAX = 0, EBX = 0, ECX = 0, EDX = 0;
+ union {
+ unsigned u[3];
+ char c[12];
+ } text;
+
+ if (!X86::GetCpuIDAndInfo(0, &EAX, text.u+0, text.u+2, text.u+1)) {
+ // FIXME: support for AMD family of processors.
+ if (memcmp(text.c, "GenuineIntel", 12) == 0) {
+ X86::GetCpuIDAndInfo(0x1, &EAX, &EBX, &ECX, &EDX);
+ if ((EDX >> 25) & 0x1)
+ return X86CompilationCallback_SSE;
+ }
+ }
+#endif
+
return X86CompilationCallback;
}
-void *X86JITInfo::emitFunctionStub(void *Fn, MachineCodeEmitter &MCE) {
- if (Fn != X86CompilationCallback) {
- MCE.startFunctionStub(5);
- MCE.emitByte(0xE9);
- MCE.emitWord((intptr_t)Fn-MCE.getCurrentPCValue()-4);
- return MCE.finishFunctionStub(0);
+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 (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) {
+#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
+ JCE.startGVStub(F, 5, 4);
+ JCE.emitByte(0xE9);
+ JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4);
+#endif
+ return JCE.finishGVStub(F);
}
- MCE.startFunctionStub(6);
- MCE.emitByte(0xE8); // Call with 32 bit pc-rel destination...
+#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
+ 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.emitWord((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)
+ assert(((((intptr_t)Fn-JCE.getCurrentPCValue()-5) << 32) >> 32) ==
+ ((intptr_t)Fn-JCE.getCurrentPCValue()-5)
+ && "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,
/// 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 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:
+ 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;
- *((intptr_t*)RelocPos) += ResultPtr;
+ 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:
// Absolute relocation, just add the relocated value to the value already
// in memory.
+ *((unsigned*)RelocPos) += (unsigned)ResultPtr;
+ break;
+ case X86::reloc_absolute_dword:
*((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!");
+ return 0;
+#endif
+}
projects / oota-llvm.git / blobdiff