InferiorCallPOSIX.cpp   [plain text]

//===-- InferiorCallPOSIX.cpp -----------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "InferiorCallPOSIX.h"
#include "lldb/Core/StreamFile.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Symbol/ClangASTContext.h"
#include "lldb/Symbol/SymbolContext.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/ThreadPlanCallFunction.h"

#include <sys/mman.h>

using namespace lldb;
using namespace lldb_private;

bool lldb_private::InferiorCallMmap(Process *process, addr_t &allocated_addr,
                                    addr_t addr, addr_t length, unsigned prot,
                                    unsigned flags, addr_t fd, addr_t offset) {
    Thread *thread = process->GetThreadList().GetSelectedThread().get();
    if (thread == NULL)
        return false;

    const bool append = true;
    const bool include_symbols = true;
    const bool include_inlines = false;
    SymbolContextList sc_list;
    const uint32_t count
      = process->GetTarget().GetImages().FindFunctions (ConstString ("mmap"), 
                                                        eFunctionNameTypeFull,
                                                        include_symbols,
                                                        include_inlines,
                                                        append, 
                                                        sc_list);
    if (count > 0)
    {
        SymbolContext sc;
        if (sc_list.GetContextAtIndex(0, sc))
        {
            const uint32_t range_scope = eSymbolContextFunction | eSymbolContextSymbol;
            const bool use_inline_block_range = false;
            const bool stop_other_threads = true;
            const bool discard_on_error = true;
            const bool try_all_threads = true;
            const uint32_t timeout_usec = 500000;

            addr_t prot_arg, flags_arg = 0;
            if (prot == eMmapProtNone)
              prot_arg = PROT_NONE;
            else {
              prot_arg = 0;
              if (prot & eMmapProtExec)
                prot_arg |= PROT_EXEC;
              if (prot & eMmapProtRead)
                prot_arg |= PROT_READ;
              if (prot & eMmapProtWrite)
                prot_arg |= PROT_WRITE;
            }

            if (flags & eMmapFlagsPrivate)
              flags_arg |= MAP_PRIVATE;
            if (flags & eMmapFlagsAnon)
              flags_arg |= MAP_ANON;

            AddressRange mmap_range;
            if (sc.GetAddressRange(range_scope, 0, use_inline_block_range, mmap_range))
            {
                ClangASTContext *clang_ast_context = process->GetTarget().GetScratchClangASTContext();
                lldb::clang_type_t clang_void_ptr_type = clang_ast_context->GetVoidPtrType(false);
                ThreadPlanCallFunction *call_function_thread_plan
                  = new ThreadPlanCallFunction (*thread,
                                                mmap_range.GetBaseAddress(),
                                                ClangASTType (clang_ast_context->getASTContext(), clang_void_ptr_type),
                                                stop_other_threads,
                                                discard_on_error,
                                                &addr,
                                                &length,
                                                &prot_arg,
                                                &flags_arg,
                                                &fd,
                                                &offset);
                lldb::ThreadPlanSP call_plan_sp (call_function_thread_plan);
                if (call_plan_sp)
                {
                    StreamFile error_strm;
                    // This plan is a utility plan, so set it to discard itself when done.
                    call_plan_sp->SetIsMasterPlan (true);
                    call_plan_sp->SetOkayToDiscard(true);
                    
                    StackFrame *frame = thread->GetStackFrameAtIndex (0).get();
                    if (frame)
                    {
                        ExecutionContext exe_ctx;
                        frame->CalculateExecutionContext (exe_ctx);
                        ExecutionResults result = process->RunThreadPlan (exe_ctx,
                                                                          call_plan_sp,        
                                                                          stop_other_threads,
                                                                          try_all_threads,
                                                                          discard_on_error,
                                                                          timeout_usec,
                                                                          error_strm);
                        if (result == eExecutionCompleted)
                        {
                            
                            allocated_addr = call_plan_sp->GetReturnValueObject()->GetValueAsUnsigned(LLDB_INVALID_ADDRESS);
                            if (process->GetAddressByteSize() == 4)
                            {
                                if (allocated_addr == UINT32_MAX)
                                    return false;
                            }
                            return true;
                        }
                    }
                }
            }
        }
    }

    return false;
}

bool lldb_private::InferiorCallMunmap(Process *process, addr_t addr,
                                      addr_t length) {
   Thread *thread = process->GetThreadList().GetSelectedThread().get();
   if (thread == NULL)
       return false;
   
   const bool append = true;
   const bool include_symbols = true;
   const bool include_inlines = false;
   SymbolContextList sc_list;
   const uint32_t count
     = process->GetTarget().GetImages().FindFunctions (ConstString ("munmap"), 
                                                       eFunctionNameTypeFull,
                                                       include_symbols, 
                                                       include_inlines,
                                                       append, 
                                                       sc_list);
   if (count > 0)
   {
       SymbolContext sc;
       if (sc_list.GetContextAtIndex(0, sc))
       {
           const uint32_t range_scope = eSymbolContextFunction | eSymbolContextSymbol;
           const bool use_inline_block_range = false;
           const bool stop_other_threads = true;
           const bool discard_on_error = true;
           const bool try_all_threads = true;
           const uint32_t timeout_usec = 500000;
           
           AddressRange munmap_range;
           if (sc.GetAddressRange(range_scope, 0, use_inline_block_range, munmap_range))
           {
               lldb::ThreadPlanSP call_plan_sp (new ThreadPlanCallFunction (*thread,
                                                                            munmap_range.GetBaseAddress(),
                                                                            ClangASTType(),
                                                                            stop_other_threads,
                                                                            discard_on_error,
                                                                            &addr,
                                                                            &length));
               if (call_plan_sp)
               {
                   StreamFile error_strm;
                   // This plan is a utility plan, so set it to discard itself when done.
                   call_plan_sp->SetIsMasterPlan (true);
                   call_plan_sp->SetOkayToDiscard(true);
                   
                   StackFrame *frame = thread->GetStackFrameAtIndex (0).get();
                   if (frame)
                   {
                       ExecutionContext exe_ctx;
                       frame->CalculateExecutionContext (exe_ctx);
                       ExecutionResults result = process->RunThreadPlan (exe_ctx,
                                                                         call_plan_sp,        
                                                                         stop_other_threads,
                                                                         try_all_threads,
                                                                         discard_on_error,
                                                                         timeout_usec,
                                                                         error_strm);
                       if (result == eExecutionCompleted)
                       {
                           return true;
                       }
                   }
               }
           }
       }
   }

   return false;
}