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Preliminary support for systems which require changing JIT memory regions privilege from read / write to read / executable.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56303 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-09-18 07:54:21 +00:00
parent 057d0c3535
commit bc4707a255
6 changed files with 54 additions and 1 deletions
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lib/System/Unix/Memory.inc
+29
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@@ -18,6 +18,10 @@
#include <sys/mman.h>
#endif
#ifdef __APPLE__
#include <mach/mach.h>
#endif
/// AllocateRWX - Allocate a slab of memory with read/write/execute
/// permissions. This is typically used for JIT applications where we want
/// to emit code to the memory then jump to it. Getting this type of memory
@@ -52,8 +56,13 @@ llvm::sys::Memory::AllocateRWX(unsigned NumBytes, const MemoryBlock* NearBlock,
void* start = NearBlock ? (unsigned char*)NearBlock->base() +
NearBlock->size() : 0;
#if defined(__APPLE__) && defined(__arm__)
void *pa = ::mmap(start, pageSize*NumPages, PROT_READ|PROT_EXEC,
flags, fd, 0);
#else
void *pa = ::mmap(start, pageSize*NumPages, PROT_READ|PROT_WRITE|PROT_EXEC,
flags, fd, 0);
#endif
if (pa == MAP_FAILED) {
if (NearBlock) //Try again without a near hint
return AllocateRWX(NumBytes, 0);
@@ -61,9 +70,29 @@ llvm::sys::Memory::AllocateRWX(unsigned NumBytes, const MemoryBlock* NearBlock,
MakeErrMsg(ErrMsg, "Can't allocate RWX Memory");
return MemoryBlock();
}
#if defined(__APPLE__) && defined(__arm__)
kern_return_t kr = vm_protect(mach_task_self(), (vm_address_t)pa,
(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");
return sys::MemoryBlock();
}
kr = vm_protect(mach_task_self(), (vm_address_t)pa,
(vm_size_t)(pageSize*NumPages), 0,
VM_PROT_READ | VM_PROT_WRITE);
if (KERN_SUCCESS != kr) {
MakeErrMsg(ErrMsg, "vm_protect RW failed\n");
return sys::MemoryBlock();
}
#endif
MemoryBlock result;
result.Address = pa;
result.Size = NumPages*pageSize;
return result;
}