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| author | Brian Gaeke <gaeke@uiuc.edu> | 2003-10-17 21:47:25 +0000 |
|---|---|---|
| committer | Brian Gaeke <gaeke@uiuc.edu> | 2003-10-17 21:47:25 +0000 |
| commit | e5f6859911108f1fa445acb2ac29902d56fcfa58 (patch) | |
| tree | 07e633e719f8e34c82e7c4134ff87dabeb089bdb /lib/Target | |
| parent | 0e077f7251e1fbbb0c457668eaf62b7b598678c2 (diff) | |
| download | llvm-e5f6859911108f1fa445acb2ac29902d56fcfa58.tar.gz llvm-e5f6859911108f1fa445acb2ac29902d56fcfa58.tar.bz2 llvm-e5f6859911108f1fa445acb2ac29902d56fcfa58.tar.xz | |
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
Diffstat (limited to 'lib/Target')
| -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! } |