1 files changed, 195 insertions, 0 deletions
diff --git a/lldb/source/Plugins/Process/MacOSX-User/source/MacOSX/MachVMMemory.cpp b/lldb/source/Plugins/Process/MacOSX-User/source/MacOSX/MachVMMemory.cpp
new file mode 100644
index 00000000000..c91af3c3596
--- /dev/null
+++ b/lldb/source/Plugins/Process/MacOSX-User/source/MacOSX/MachVMMemory.cpp
@@ -0,0 +1,195 @@
+//===-- MachVMMemory.cpp ----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "MachVMMemory.h"
+
+#include <mach/mach_vm.h>
+
+#include "MachVMRegion.h"
+#include "ProcessMacOSXLog.h"
+
+using namespace lldb_private;
+
+MachVMMemory::MachVMMemory() :
+    m_page_size (kInvalidPageSize)
+{
+}
+
+MachVMMemory::~MachVMMemory()
+{
+}
+
+size_t
+MachVMMemory::PageSize(lldb_private::Error &error)
+{
+    if (m_page_size == kInvalidPageSize)
+    {
+        error = ::host_page_size( ::mach_host_self(), &m_page_size);
+        if (error.Fail())
+            m_page_size = 0;
+    }
+
+    if (m_page_size != 0 && m_page_size != kInvalidPageSize)
+    {
+        if (error.Success())
+            error.SetErrorString ("unable to determine page size");
+    }
+    return m_page_size;
+}
+
+size_t
+MachVMMemory::MaxBytesLeftInPage (lldb::addr_t addr, size_t count)
+{
+    Error error;
+    const size_t page_size = PageSize(error);
+    if (page_size > 0)
+    {
+        size_t page_offset = (addr % page_size);
+        size_t bytes_left_in_page = page_size - page_offset;
+        if (count > bytes_left_in_page)
+            count = bytes_left_in_page;
+    }
+    return count;
+}
+
+size_t
+MachVMMemory::Read(task_t task, lldb::addr_t address, void *data, size_t data_count, Error &error)
+{
+    if (data == NULL || data_count == 0)
+        return 0;
+
+    size_t total_bytes_read = 0;
+    lldb::addr_t curr_addr = address;
+    uint8_t *curr_data = (uint8_t*)data;
+    while (total_bytes_read < data_count)
+    {
+        mach_vm_size_t curr_size = MaxBytesLeftInPage(curr_addr, data_count - total_bytes_read);
+        mach_msg_type_number_t curr_bytes_read = 0;
+        vm_offset_t vm_memory = NULL;
+        error = ::mach_vm_read (task, curr_addr, curr_size, &vm_memory, &curr_bytes_read);
+        Log *log = ProcessMacOSXLog::GetLogIfAllCategoriesSet (PD_LOG_MEMORY|PD_LOG_VERBOSE);
+
+        if (log || error.Fail())
+            error.PutToLog (log, "::mach_vm_read (task = 0x%4.4x, addr = 0x%8.8llx, size = %llu, data => %8.8p, dataCnt => %i)", task, (uint64_t)curr_addr, (uint64_t)curr_size, vm_memory, curr_bytes_read);
+
+        if (error.Success())
+        {
+            if (curr_bytes_read != curr_size)
+            {
+                if (log)
+                    error.PutToLog (log, "::mach_vm_read (task = 0x%4.4x, addr = 0x%8.8llx, size = %llu, data => %8.8p, dataCnt=>%i) only read %u of %llu bytes", task, (uint64_t)curr_addr, (uint64_t)curr_size, vm_memory, curr_bytes_read, curr_bytes_read, (uint64_t)curr_size);
+            }
+            ::memcpy (curr_data, (void *)vm_memory, curr_bytes_read);
+            ::vm_deallocate (mach_task_self (), vm_memory, curr_bytes_read);
+            total_bytes_read += curr_bytes_read;
+            curr_addr += curr_bytes_read;
+            curr_data += curr_bytes_read;
+        }
+        else
+        {
+            break;
+        }
+    }
+    return total_bytes_read;
+}
+
+
+size_t
+MachVMMemory::Write(task_t task, lldb::addr_t address, const void *data, size_t data_count, Error &error)
+{
+    MachVMRegion vmRegion(task);
+
+    size_t total_bytes_written = 0;
+    lldb::addr_t curr_addr = address;
+    const uint8_t *curr_data = (const uint8_t*)data;
+
+
+    while (total_bytes_written < data_count)
+    {
+        if (vmRegion.GetRegionForAddress(curr_addr))
+        {
+            mach_vm_size_t curr_data_count = data_count - total_bytes_written;
+            mach_vm_size_t region_bytes_left = vmRegion.BytesRemaining(curr_addr);
+            if (region_bytes_left == 0)
+            {
+                break;
+            }
+            if (curr_data_count > region_bytes_left)
+                curr_data_count = region_bytes_left;
+
+            if (vmRegion.SetProtections(curr_addr, curr_data_count, VM_PROT_READ | VM_PROT_WRITE))
+            {
+                size_t bytes_written = WriteRegion(task, curr_addr, curr_data, curr_data_count, error);
+                if (bytes_written <= 0)
+                {
+                    // Error should have already be posted by WriteRegion...
+                    break;
+                }
+                else
+                {
+                    total_bytes_written += bytes_written;
+                    curr_addr += bytes_written;
+                    curr_data += bytes_written;
+                }
+            }
+            else
+            {
+                ProcessMacOSXLog::LogIf (PD_LOG_MEMORY_PROTECTIONS, "Failed to set read/write protections on region for address: [0x%8.8llx-0x%8.8llx)", (uint64_t)curr_addr, (uint64_t)(curr_addr + curr_data_count));
+                break;
+            }
+        }
+        else
+        {
+            ProcessMacOSXLog::LogIf (PD_LOG_MEMORY_PROTECTIONS, "Failed to get region for address: 0x%8.8llx", (uint64_t)address);
+            break;
+        }
+    }
+
+    return total_bytes_written;
+}
+
+
+size_t
+MachVMMemory::WriteRegion(task_t task, const lldb::addr_t address, const void *data, const size_t data_count, Error &error)
+{
+    if (data == NULL || data_count == 0)
+        return 0;
+
+    size_t total_bytes_written = 0;
+    lldb::addr_t curr_addr = address;
+    const uint8_t *curr_data = (const uint8_t*)data;
+    while (total_bytes_written < data_count)
+    {
+        mach_msg_type_number_t curr_data_count = MaxBytesLeftInPage(curr_addr, data_count - total_bytes_written);
+        error = ::mach_vm_write (task, curr_addr, (pointer_t) curr_data, curr_data_count);
+        Log *log = ProcessMacOSXLog::GetLogIfAllCategoriesSet (PD_LOG_MEMORY);
+        if (log || error.Fail())
+            error.PutToLog (log, "::mach_vm_write ( task = 0x%4.4x, addr = 0x%8.8llx, data = %8.8p, dataCnt = %u )", task, (uint64_t)curr_addr, curr_data, curr_data_count);
+
+#if defined (__powerpc__) || defined (__ppc__)
+        vm_machine_attribute_val_t mattr_value = MATTR_VAL_CACHE_FLUSH;
+
+        error = ::vm_machine_attribute (task, curr_addr, curr_data_count, MATTR_CACHE, &mattr_value);
+        if (log || error.Fail())
+            error.Log(log, "::vm_machine_attribute ( task = 0x%4.4x, addr = 0x%8.8llx, size = %u, attr = MATTR_CACHE, mattr_value => MATTR_VAL_CACHE_FLUSH )", task, (uint64_t)curr_addr, curr_data_count);
+#endif
+
+        if (error.Success())
+        {
+            total_bytes_written += curr_data_count;
+            curr_addr += curr_data_count;
+            curr_data += curr_data_count;
+        }
+        else
+        {
+            break;
+        }
+    }
+    return total_bytes_written;
+}