From e5f6859911108f1fa445acb2ac29902d56fcfa58 Mon Sep 17 00:00:00 2001 From: Brian Gaeke Date: Fri, 17 Oct 2003 21:47:25 +0000 Subject: [PATCH] You can't just blat the address into memory, you have to blat its displacement. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9210 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/X86/X86TargetMachine.cpp | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/lib/Target/X86/X86TargetMachine.cpp b/lib/Target/X86/X86TargetMachine.cpp index 14af52099dd..0a42f19733c 100644 --- a/lib/Target/X86/X86TargetMachine.cpp +++ b/lib/Target/X86/X86TargetMachine.cpp @@ -143,9 +143,12 @@ bool X86TargetMachine::addPassesToJITCompile(FunctionPassManager &PM) { } bool X86TargetMachine::replaceMachineCodeForFunction (void *Old, void *New) { + // FIXME: This code could perhaps live in a more appropriate place. char *OldByte = (char *) Old; - *OldByte++ = 0xE9; // JMP - unsigned *OldWord = (unsigned *) OldByte; - *OldWord = (unsigned) New; - return false; + *OldByte++ = 0xE9; // Emit JMP opcode. + int32_t *OldWord = (int32_t *) OldByte; + int32_t NewAddr = (int32_t) New; + int32_t OldAddr = (int32_t) OldWord; + *OldWord = NewAddr - OldAddr - 4; // Emit PC-relative addr of New code. + return false; // success! }