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On Darwin ARM, memory needs special handling to do JIT. This patch expands

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this handling to work properly for modifying stub functions, relocations
back to entry points after JIT compilation, etc..


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57013 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach
2008-10-03 16:17:20 +00:00
parent 48b828fdb4
commit cce6c297c5
6 changed files with 66 additions and 15 deletions
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lib/System/Unix/Memory.inc
+25 -1
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@@ -76,7 +76,7 @@ llvm::sys::Memory::AllocateRWX(unsigned NumBytes, const MemoryBlock* NearBlock,
(vm_size_t)(pageSize*NumPages), 0,
VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_COPY);
if (KERN_SUCCESS != kr) {
MakeErrMsg(ErrMsg, "vm_protect max RWX failed\n");
MakeErrMsg(ErrMsg, "vm_protect max RX failed\n");
return sys::MemoryBlock();
}
@@ -103,3 +103,27 @@ bool llvm::sys::Memory::ReleaseRWX(MemoryBlock &M, std::string *ErrMsg) {
return false;
}
bool llvm::sys::Memory::setWritable (MemoryBlock &M, std::string *ErrMsg) {
#if defined(__APPLE__) && defined(__arm__)
if (M.Address == 0 || M.Size == 0) return false;
sys::Memory::InvalidateInstructionCache(M.Address, M.Size);
kern_return_t kr = vm_protect(mach_task_self(), (vm_address_t)M.Address,
(vm_size_t)M.Size, 0, VM_PROT_READ | VM_PROT_WRITE);
return KERN_SUCCESS == kr;
#else
return true;
#endif
}
bool llvm::sys::Memory::setExecutable (MemoryBlock &M, std::string *ErrMsg) {
#if defined(__APPLE__) && defined(__arm__)
if (M.Address == 0 || M.Size == 0) return false;
sys::Memory::InvalidateInstructionCache(M.Address, M.Size);
kern_return_t kr = vm_protect(mach_task_self(), (vm_address_t)M.Address,
(vm_size_t)M.Size, 0, VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_COPY);
return KERN_SUCCESS == kr;
#else
return false;
#endif
}