diff options
| -rw-r--r-- | lib/Target/X86/X86TargetMachine.cpp | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/lib/Target/X86/X86TargetMachine.cpp b/lib/Target/X86/X86TargetMachine.cpp index 14af52099d..0a42f19733 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! } |