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7d1a7c0417
interrupt instruction, which shouldn't arise any other way). 0xcd is also used by JITMemoryManager to initialize the buffer to garbage, which means it could appear following a noreturn call even when that is not a stub, confusing X86CompilationCallback2. PR 4929. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81888 91177308-0d34-0410-b5e6-96231b3b80d8
562 lines
18 KiB
C++
562 lines
18 KiB
C++
//===-- X86JITInfo.cpp - Implement the JIT interfaces for the X86 target --===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the JIT interfaces for the X86 target.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "jit"
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#include "X86JITInfo.h"
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#include "X86Relocations.h"
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#include "X86Subtarget.h"
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#include "X86TargetMachine.h"
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#include "llvm/Function.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <cstdlib>
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#include <cstring>
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using namespace llvm;
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// Determine the platform we're running on
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#if defined (__x86_64__) || defined (_M_AMD64) || defined (_M_X64)
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# define X86_64_JIT
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#elif defined(__i386__) || defined(i386) || defined(_M_IX86)
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# define X86_32_JIT
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#endif
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void X86JITInfo::replaceMachineCodeForFunction(void *Old, void *New) {
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unsigned char *OldByte = (unsigned char *)Old;
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*OldByte++ = 0xE9; // Emit JMP opcode.
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unsigned *OldWord = (unsigned *)OldByte;
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unsigned NewAddr = (intptr_t)New;
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unsigned OldAddr = (intptr_t)OldWord;
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*OldWord = NewAddr - OldAddr - 4; // Emit PC-relative addr of New code.
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}
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/// JITCompilerFunction - This contains the address of the JIT function used to
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/// compile a function lazily.
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static TargetJITInfo::JITCompilerFn JITCompilerFunction;
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// Get the ASMPREFIX for the current host. This is often '_'.
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#ifndef __USER_LABEL_PREFIX__
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#define __USER_LABEL_PREFIX__
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#endif
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#define GETASMPREFIX2(X) #X
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#define GETASMPREFIX(X) GETASMPREFIX2(X)
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#define ASMPREFIX GETASMPREFIX(__USER_LABEL_PREFIX__)
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// For ELF targets, use a .size and .type directive, to let tools
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// know the extent of functions defined in assembler.
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#if defined(__ELF__)
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# define SIZE(sym) ".size " #sym ", . - " #sym "\n"
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# define TYPE_FUNCTION(sym) ".type " #sym ", @function\n"
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#else
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# define SIZE(sym)
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# define TYPE_FUNCTION(sym)
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#endif
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// Provide a convenient way for disabling usage of CFI directives.
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// This is needed for old/broken assemblers (for example, gas on
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// Darwin is pretty old and doesn't support these directives)
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#if defined(__APPLE__)
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# define CFI(x)
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#else
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// FIXME: Disable this until we really want to use it. Also, we will
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// need to add some workarounds for compilers, which support
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// only subset of these directives.
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# define CFI(x)
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#endif
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// Provide a wrapper for X86CompilationCallback2 that saves non-traditional
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// callee saved registers, for the fastcc calling convention.
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extern "C" {
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#if defined(X86_64_JIT)
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# ifndef _MSC_VER
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// No need to save EAX/EDX for X86-64.
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void X86CompilationCallback(void);
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asm(
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".text\n"
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".align 8\n"
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".globl " ASMPREFIX "X86CompilationCallback\n"
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TYPE_FUNCTION(X86CompilationCallback)
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ASMPREFIX "X86CompilationCallback:\n"
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CFI(".cfi_startproc\n")
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// Save RBP
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"pushq %rbp\n"
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CFI(".cfi_def_cfa_offset 16\n")
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CFI(".cfi_offset %rbp, -16\n")
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// Save RSP
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"movq %rsp, %rbp\n"
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CFI(".cfi_def_cfa_register %rbp\n")
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// Save all int arg registers
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"pushq %rdi\n"
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CFI(".cfi_rel_offset %rdi, 0\n")
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"pushq %rsi\n"
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CFI(".cfi_rel_offset %rsi, 8\n")
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"pushq %rdx\n"
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CFI(".cfi_rel_offset %rdx, 16\n")
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"pushq %rcx\n"
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CFI(".cfi_rel_offset %rcx, 24\n")
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"pushq %r8\n"
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CFI(".cfi_rel_offset %r8, 32\n")
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"pushq %r9\n"
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CFI(".cfi_rel_offset %r9, 40\n")
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// Align stack on 16-byte boundary. ESP might not be properly aligned
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// (8 byte) if this is called from an indirect stub.
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"andq $-16, %rsp\n"
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// Save all XMM arg registers
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"subq $128, %rsp\n"
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"movaps %xmm0, (%rsp)\n"
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"movaps %xmm1, 16(%rsp)\n"
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"movaps %xmm2, 32(%rsp)\n"
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"movaps %xmm3, 48(%rsp)\n"
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"movaps %xmm4, 64(%rsp)\n"
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"movaps %xmm5, 80(%rsp)\n"
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"movaps %xmm6, 96(%rsp)\n"
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"movaps %xmm7, 112(%rsp)\n"
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// JIT callee
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"movq %rbp, %rdi\n" // Pass prev frame and return address
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"movq 8(%rbp), %rsi\n"
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"call " ASMPREFIX "X86CompilationCallback2\n"
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// Restore all XMM arg registers
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"movaps 112(%rsp), %xmm7\n"
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"movaps 96(%rsp), %xmm6\n"
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"movaps 80(%rsp), %xmm5\n"
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"movaps 64(%rsp), %xmm4\n"
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"movaps 48(%rsp), %xmm3\n"
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"movaps 32(%rsp), %xmm2\n"
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"movaps 16(%rsp), %xmm1\n"
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"movaps (%rsp), %xmm0\n"
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// Restore RSP
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"movq %rbp, %rsp\n"
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CFI(".cfi_def_cfa_register %rsp\n")
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// Restore all int arg registers
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"subq $48, %rsp\n"
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CFI(".cfi_adjust_cfa_offset 48\n")
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"popq %r9\n"
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CFI(".cfi_adjust_cfa_offset -8\n")
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CFI(".cfi_restore %r9\n")
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"popq %r8\n"
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CFI(".cfi_adjust_cfa_offset -8\n")
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CFI(".cfi_restore %r8\n")
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"popq %rcx\n"
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CFI(".cfi_adjust_cfa_offset -8\n")
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CFI(".cfi_restore %rcx\n")
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"popq %rdx\n"
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CFI(".cfi_adjust_cfa_offset -8\n")
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CFI(".cfi_restore %rdx\n")
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"popq %rsi\n"
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CFI(".cfi_adjust_cfa_offset -8\n")
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CFI(".cfi_restore %rsi\n")
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"popq %rdi\n"
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CFI(".cfi_adjust_cfa_offset -8\n")
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CFI(".cfi_restore %rdi\n")
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// Restore RBP
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"popq %rbp\n"
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CFI(".cfi_adjust_cfa_offset -8\n")
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CFI(".cfi_restore %rbp\n")
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"ret\n"
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CFI(".cfi_endproc\n")
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SIZE(X86CompilationCallback)
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);
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# else
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// No inline assembler support on this platform. The routine is in external
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// file.
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void X86CompilationCallback();
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# endif
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#elif defined (X86_32_JIT)
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# ifndef _MSC_VER
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void X86CompilationCallback(void);
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asm(
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".text\n"
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".align 8\n"
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".globl " ASMPREFIX "X86CompilationCallback\n"
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TYPE_FUNCTION(X86CompilationCallback)
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ASMPREFIX "X86CompilationCallback:\n"
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CFI(".cfi_startproc\n")
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"pushl %ebp\n"
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CFI(".cfi_def_cfa_offset 8\n")
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CFI(".cfi_offset %ebp, -8\n")
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"movl %esp, %ebp\n" // Standard prologue
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CFI(".cfi_def_cfa_register %ebp\n")
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"pushl %eax\n"
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CFI(".cfi_rel_offset %eax, 0\n")
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"pushl %edx\n" // Save EAX/EDX/ECX
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CFI(".cfi_rel_offset %edx, 4\n")
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"pushl %ecx\n"
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CFI(".cfi_rel_offset %ecx, 8\n")
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# if defined(__APPLE__)
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"andl $-16, %esp\n" // Align ESP on 16-byte boundary
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# endif
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"subl $16, %esp\n"
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"movl 4(%ebp), %eax\n" // Pass prev frame and return address
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"movl %eax, 4(%esp)\n"
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"movl %ebp, (%esp)\n"
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"call " ASMPREFIX "X86CompilationCallback2\n"
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"movl %ebp, %esp\n" // Restore ESP
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CFI(".cfi_def_cfa_register %esp\n")
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"subl $12, %esp\n"
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CFI(".cfi_adjust_cfa_offset 12\n")
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"popl %ecx\n"
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CFI(".cfi_adjust_cfa_offset -4\n")
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CFI(".cfi_restore %ecx\n")
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"popl %edx\n"
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CFI(".cfi_adjust_cfa_offset -4\n")
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CFI(".cfi_restore %edx\n")
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"popl %eax\n"
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CFI(".cfi_adjust_cfa_offset -4\n")
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CFI(".cfi_restore %eax\n")
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"popl %ebp\n"
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CFI(".cfi_adjust_cfa_offset -4\n")
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CFI(".cfi_restore %ebp\n")
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"ret\n"
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CFI(".cfi_endproc\n")
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SIZE(X86CompilationCallback)
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);
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// Same as X86CompilationCallback but also saves XMM argument registers.
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void X86CompilationCallback_SSE(void);
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asm(
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".text\n"
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".align 8\n"
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".globl " ASMPREFIX "X86CompilationCallback_SSE\n"
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TYPE_FUNCTION(X86CompilationCallback_SSE)
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ASMPREFIX "X86CompilationCallback_SSE:\n"
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CFI(".cfi_startproc\n")
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"pushl %ebp\n"
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CFI(".cfi_def_cfa_offset 8\n")
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CFI(".cfi_offset %ebp, -8\n")
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"movl %esp, %ebp\n" // Standard prologue
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CFI(".cfi_def_cfa_register %ebp\n")
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"pushl %eax\n"
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CFI(".cfi_rel_offset %eax, 0\n")
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"pushl %edx\n" // Save EAX/EDX/ECX
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CFI(".cfi_rel_offset %edx, 4\n")
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"pushl %ecx\n"
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CFI(".cfi_rel_offset %ecx, 8\n")
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"andl $-16, %esp\n" // Align ESP on 16-byte boundary
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// Save all XMM arg registers
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"subl $64, %esp\n"
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// FIXME: provide frame move information for xmm registers.
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// This can be tricky, because CFA register is ebp (unaligned)
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// and we need to produce offsets relative to it.
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"movaps %xmm0, (%esp)\n"
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"movaps %xmm1, 16(%esp)\n"
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"movaps %xmm2, 32(%esp)\n"
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"movaps %xmm3, 48(%esp)\n"
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"subl $16, %esp\n"
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"movl 4(%ebp), %eax\n" // Pass prev frame and return address
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"movl %eax, 4(%esp)\n"
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"movl %ebp, (%esp)\n"
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"call " ASMPREFIX "X86CompilationCallback2\n"
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"addl $16, %esp\n"
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"movaps 48(%esp), %xmm3\n"
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CFI(".cfi_restore %xmm3\n")
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"movaps 32(%esp), %xmm2\n"
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CFI(".cfi_restore %xmm2\n")
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"movaps 16(%esp), %xmm1\n"
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CFI(".cfi_restore %xmm1\n")
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"movaps (%esp), %xmm0\n"
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CFI(".cfi_restore %xmm0\n")
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"movl %ebp, %esp\n" // Restore ESP
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CFI(".cfi_def_cfa_register esp\n")
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"subl $12, %esp\n"
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CFI(".cfi_adjust_cfa_offset 12\n")
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"popl %ecx\n"
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CFI(".cfi_adjust_cfa_offset -4\n")
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CFI(".cfi_restore %ecx\n")
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"popl %edx\n"
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CFI(".cfi_adjust_cfa_offset -4\n")
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CFI(".cfi_restore %edx\n")
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"popl %eax\n"
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CFI(".cfi_adjust_cfa_offset -4\n")
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CFI(".cfi_restore %eax\n")
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"popl %ebp\n"
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CFI(".cfi_adjust_cfa_offset -4\n")
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CFI(".cfi_restore %ebp\n")
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"ret\n"
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CFI(".cfi_endproc\n")
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SIZE(X86CompilationCallback_SSE)
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);
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# else
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void X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr);
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_declspec(naked) void X86CompilationCallback(void) {
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__asm {
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push ebp
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mov ebp, esp
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push eax
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push edx
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push ecx
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and esp, -16
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mov eax, dword ptr [ebp+4]
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mov dword ptr [esp+4], eax
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mov dword ptr [esp], ebp
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call X86CompilationCallback2
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mov esp, ebp
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sub esp, 12
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pop ecx
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pop edx
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pop eax
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pop ebp
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ret
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}
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}
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# endif // _MSC_VER
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#else // Not an i386 host
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void X86CompilationCallback() {
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llvm_unreachable("Cannot call X86CompilationCallback() on a non-x86 arch!");
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}
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#endif
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}
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/// X86CompilationCallback2 - This is the target-specific function invoked by the
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/// function stub when we did not know the real target of a call. This function
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/// must locate the start of the stub or call site and pass it into the JIT
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/// compiler function.
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extern "C" {
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#if !(defined (X86_64_JIT) && defined(_MSC_VER))
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// the following function is called only from this translation unit,
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// unless we are under 64bit Windows with MSC, where there is
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// no support for inline assembly
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static
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#endif
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void ATTRIBUTE_USED
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X86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr) {
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intptr_t *RetAddrLoc = &StackPtr[1];
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assert(*RetAddrLoc == RetAddr &&
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"Could not find return address on the stack!");
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// It's a stub if there is an interrupt marker after the call.
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bool isStub = ((unsigned char*)RetAddr)[0] == 0xCE;
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// The call instruction should have pushed the return value onto the stack...
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#if defined (X86_64_JIT)
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RetAddr--; // Backtrack to the reference itself...
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#else
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RetAddr -= 4; // Backtrack to the reference itself...
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#endif
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#if 0
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DEBUG(errs() << "In callback! Addr=" << (void*)RetAddr
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<< " ESP=" << (void*)StackPtr
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<< ": Resolving call to function: "
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<< TheVM->getFunctionReferencedName((void*)RetAddr) << "\n");
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#endif
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// Sanity check to make sure this really is a call instruction.
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#if defined (X86_64_JIT)
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assert(((unsigned char*)RetAddr)[-2] == 0x41 &&"Not a call instr!");
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assert(((unsigned char*)RetAddr)[-1] == 0xFF &&"Not a call instr!");
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#else
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assert(((unsigned char*)RetAddr)[-1] == 0xE8 &&"Not a call instr!");
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#endif
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intptr_t NewVal = (intptr_t)JITCompilerFunction((void*)RetAddr);
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// Rewrite the call target... so that we don't end up here every time we
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// execute the call.
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#if defined (X86_64_JIT)
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if (!isStub)
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*(intptr_t *)(RetAddr - 0xa) = NewVal;
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#else
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*(intptr_t *)RetAddr = (intptr_t)(NewVal-RetAddr-4);
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#endif
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if (isStub) {
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// If this is a stub, rewrite the call into an unconditional branch
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// instruction so that two return addresses are not pushed onto the stack
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// when the requested function finally gets called. This also makes the
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// 0xCE byte (interrupt) dead, so the marker doesn't effect anything.
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#if defined (X86_64_JIT)
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// If the target address is within 32-bit range of the stub, use a
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// PC-relative branch instead of loading the actual address. (This is
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// considerably shorter than the 64-bit immediate load already there.)
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// We assume here intptr_t is 64 bits.
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intptr_t diff = NewVal-RetAddr+7;
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if (diff >= -2147483648LL && diff <= 2147483647LL) {
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*(unsigned char*)(RetAddr-0xc) = 0xE9;
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*(intptr_t *)(RetAddr-0xb) = diff & 0xffffffff;
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} else {
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*(intptr_t *)(RetAddr - 0xa) = NewVal;
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((unsigned char*)RetAddr)[0] = (2 | (4 << 3) | (3 << 6));
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}
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#else
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((unsigned char*)RetAddr)[-1] = 0xE9;
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#endif
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}
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// Change the return address to reexecute the call instruction...
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#if defined (X86_64_JIT)
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*RetAddrLoc -= 0xd;
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#else
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*RetAddrLoc -= 5;
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#endif
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}
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}
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TargetJITInfo::LazyResolverFn
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X86JITInfo::getLazyResolverFunction(JITCompilerFn F) {
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JITCompilerFunction = F;
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#if defined (X86_32_JIT) && !defined (_MSC_VER)
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if (Subtarget->hasSSE1())
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return X86CompilationCallback_SSE;
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#endif
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return X86CompilationCallback;
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}
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X86JITInfo::X86JITInfo(X86TargetMachine &tm) : TM(tm) {
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Subtarget = &TM.getSubtarget<X86Subtarget>();
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useGOT = 0;
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TLSOffset = 0;
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}
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void *X86JITInfo::emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
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JITCodeEmitter &JCE) {
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#if defined (X86_64_JIT)
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JCE.startGVStub(GV, 8, 8);
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JCE.emitWordLE((unsigned)(intptr_t)ptr);
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JCE.emitWordLE((unsigned)(((intptr_t)ptr) >> 32));
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#else
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JCE.startGVStub(GV, 4, 4);
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JCE.emitWordLE((intptr_t)ptr);
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#endif
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return JCE.finishGVStub(GV);
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}
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void *X86JITInfo::emitFunctionStub(const Function* F, void *Fn,
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JITCodeEmitter &JCE) {
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// Note, we cast to intptr_t here to silence a -pedantic warning that
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// complains about casting a function pointer to a normal pointer.
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#if defined (X86_32_JIT) && !defined (_MSC_VER)
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bool NotCC = (Fn != (void*)(intptr_t)X86CompilationCallback &&
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Fn != (void*)(intptr_t)X86CompilationCallback_SSE);
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#else
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bool NotCC = Fn != (void*)(intptr_t)X86CompilationCallback;
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#endif
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if (NotCC) {
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#if defined (X86_64_JIT)
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JCE.startGVStub(F, 13, 4);
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JCE.emitByte(0x49); // REX prefix
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JCE.emitByte(0xB8+2); // movabsq r10
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JCE.emitWordLE((unsigned)(intptr_t)Fn);
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JCE.emitWordLE((unsigned)(((intptr_t)Fn) >> 32));
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JCE.emitByte(0x41); // REX prefix
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JCE.emitByte(0xFF); // jmpq *r10
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JCE.emitByte(2 | (4 << 3) | (3 << 6));
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#else
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JCE.startGVStub(F, 5, 4);
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JCE.emitByte(0xE9);
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JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4);
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#endif
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return JCE.finishGVStub(F);
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}
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#if defined (X86_64_JIT)
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JCE.startGVStub(F, 14, 4);
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JCE.emitByte(0x49); // REX prefix
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JCE.emitByte(0xB8+2); // movabsq r10
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JCE.emitWordLE((unsigned)(intptr_t)Fn);
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JCE.emitWordLE((unsigned)(((intptr_t)Fn) >> 32));
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JCE.emitByte(0x41); // REX prefix
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JCE.emitByte(0xFF); // callq *r10
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JCE.emitByte(2 | (2 << 3) | (3 << 6));
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#else
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JCE.startGVStub(F, 6, 4);
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JCE.emitByte(0xE8); // Call with 32 bit pc-rel destination...
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JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4);
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#endif
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// This used to use 0xCD, but that value is used by JITMemoryManager to
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// initialize the buffer with garbage, which means it may follow a
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// noreturn function call, confusing X86CompilationCallback2. PR 4929.
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JCE.emitByte(0xCE); // Interrupt - Just a marker identifying the stub!
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return JCE.finishGVStub(F);
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}
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void X86JITInfo::emitFunctionStubAtAddr(const Function* F, void *Fn, void *Stub,
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JITCodeEmitter &JCE) {
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// Note, we cast to intptr_t here to silence a -pedantic warning that
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// complains about casting a function pointer to a normal pointer.
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JCE.startGVStub(F, Stub, 5);
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JCE.emitByte(0xE9);
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#if defined (X86_64_JIT) && !defined (NDEBUG)
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// Yes, we need both of these casts, or some broken versions of GCC (4.2.4)
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// get the signed-ness of the expression wrong. Go figure.
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intptr_t Displacement = (intptr_t)Fn - (intptr_t)JCE.getCurrentPCValue() - 5;
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assert(((Displacement << 32) >> 32) == Displacement
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&& "PIC displacement does not fit in displacement field!");
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#endif
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JCE.emitWordLE((intptr_t)Fn-JCE.getCurrentPCValue()-4);
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JCE.finishGVStub(F);
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}
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/// getPICJumpTableEntry - Returns the value of the jumptable entry for the
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/// specific basic block.
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uintptr_t X86JITInfo::getPICJumpTableEntry(uintptr_t BB, uintptr_t Entry) {
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#if defined(X86_64_JIT)
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return BB - Entry;
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#else
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return BB - PICBase;
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#endif
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}
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/// relocate - Before the JIT can run a block of code that has been emitted,
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/// it must rewrite the code to contain the actual addresses of any
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/// referenced global symbols.
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void X86JITInfo::relocate(void *Function, MachineRelocation *MR,
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unsigned NumRelocs, unsigned char* GOTBase) {
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for (unsigned i = 0; i != NumRelocs; ++i, ++MR) {
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void *RelocPos = (char*)Function + MR->getMachineCodeOffset();
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intptr_t ResultPtr = (intptr_t)MR->getResultPointer();
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switch ((X86::RelocationType)MR->getRelocationType()) {
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case X86::reloc_pcrel_word: {
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// PC relative relocation, add the relocated value to the value already in
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// memory, after we adjust it for where the PC is.
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ResultPtr = ResultPtr -(intptr_t)RelocPos - 4 - MR->getConstantVal();
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*((unsigned*)RelocPos) += (unsigned)ResultPtr;
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break;
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}
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case X86::reloc_picrel_word: {
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// PIC base relative relocation, add the relocated value to the value
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// already in memory, after we adjust it for where the PIC base is.
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ResultPtr = ResultPtr - ((intptr_t)Function + MR->getConstantVal());
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*((unsigned*)RelocPos) += (unsigned)ResultPtr;
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break;
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}
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case X86::reloc_absolute_word:
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case X86::reloc_absolute_word_sext:
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// Absolute relocation, just add the relocated value to the value already
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// in memory.
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*((unsigned*)RelocPos) += (unsigned)ResultPtr;
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break;
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case X86::reloc_absolute_dword:
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*((intptr_t*)RelocPos) += ResultPtr;
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break;
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}
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}
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}
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char* X86JITInfo::allocateThreadLocalMemory(size_t size) {
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#if defined(X86_32_JIT) && !defined(__APPLE__) && !defined(_MSC_VER)
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TLSOffset -= size;
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return TLSOffset;
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#else
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llvm_unreachable("Cannot allocate thread local storage on this arch!");
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return 0;
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#endif
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}
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