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Add absolute load address support for the DynamicLoader plugins 

The POSIX linker generally reports the load bias for the loaded
libraries but in some case it is useful to handle a library based on
absolute load address. Example usecases:
* Windows linker uses absolute addresses
* Library list came from different source (e.g. /proc/<pid>/maps)

Differential revision: http://reviews.llvm.org/D12233

llvm-svn: 245834
This commit is contained in:
Tamas Berghammer 2015-08-24 10:21:55 +00:00
parent 71ad47f81f
commit 42ecef3b15
7 changed files with 109 additions and 73 deletions
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13
lldb/include/lldb/Target/DynamicLoader.h
View File

@ -263,12 +263,14 @@ protected:
virtual void
UpdateLoadedSections(lldb::ModuleSP module,
lldb::addr_t link_map_addr,
lldb::addr_t base_addr);
lldb::addr_t base_addr,
bool base_addr_is_offset);
// Utility method so base classes can share implementation of UpdateLoadedSections
void
UpdateLoadedSectionsCommon(lldb::ModuleSP module,
lldb::addr_t base_addr);
lldb::addr_t base_addr,
bool base_addr_is_offset);
/// Removes the loaded sections from the target in @p module.
///
@ -282,8 +284,11 @@ protected:
/// Locates or creates a module given by @p file and updates/loads the
/// resulting module at the virtual base address @p base_addr.
lldb::ModuleSP
LoadModuleAtAddress(const lldb_private::FileSpec &file, lldb::addr_t link_map_addr, lldb::addr_t base_addr);
virtual lldb::ModuleSP
LoadModuleAtAddress(const lldb_private::FileSpec &file,
lldb::addr_t link_map_addr,
lldb::addr_t base_addr,
bool base_addr_is_offset);
const lldb_private::SectionList *
GetSectionListFromModule(const lldb::ModuleSP module) const;

46
lldb/source/Core/DynamicLoader.cpp
View File

@ -119,16 +119,20 @@ DynamicLoader::GetTargetExecutable()
}
void
DynamicLoader::UpdateLoadedSections(ModuleSP module, addr_t link_map_addr, addr_t base_addr)
DynamicLoader::UpdateLoadedSections(ModuleSP module,
addr_t link_map_addr,
addr_t base_addr,
bool base_addr_is_offset)
{
UpdateLoadedSectionsCommon(module, base_addr);
UpdateLoadedSectionsCommon(module, base_addr, base_addr_is_offset);
}
void
DynamicLoader::UpdateLoadedSectionsCommon(ModuleSP module, addr_t base_addr)
DynamicLoader::UpdateLoadedSectionsCommon(ModuleSP module,
addr_t base_addr,
bool base_addr_is_offset)
{
bool changed;
const bool base_addr_is_offset = true;
module->SetLoadAddress(m_process->GetTarget(), base_addr, base_addr_is_offset, changed);
}
@ -171,7 +175,10 @@ DynamicLoader::GetSectionListFromModule(const ModuleSP module) const
}
ModuleSP
DynamicLoader::LoadModuleAtAddress(const FileSpec &file, addr_t link_map_addr, addr_t base_addr)
DynamicLoader::LoadModuleAtAddress(const FileSpec &file,
addr_t link_map_addr,
addr_t base_addr,
bool base_addr_is_offset)
{
Target &target = m_process->GetTarget();
ModuleList &modules = target.GetImages();
@ -180,27 +187,28 @@ DynamicLoader::LoadModuleAtAddress(const FileSpec &file, addr_t link_map_addr, a
ModuleSpec module_spec (file, target.GetArchitecture());
if ((module_sp = modules.FindFirstModule (module_spec)))
{
UpdateLoadedSections(module_sp, link_map_addr, base_addr);
UpdateLoadedSections(module_sp, link_map_addr, base_addr, base_addr_is_offset);
}
else if ((module_sp = target.GetSharedModule(module_spec)))
{
UpdateLoadedSections(module_sp, link_map_addr, base_addr);
UpdateLoadedSections(module_sp, link_map_addr, base_addr, base_addr_is_offset);
}
else
{
// Try to fetch the load address of the file from the process. It can be different from the
// address reported by the linker in case of a file with fixed load address because the
// linker reports the bias between the load address specified in the file and the actual
// load address it loaded the file.
bool is_loaded;
lldb::addr_t load_addr;
Error error = m_process->GetFileLoadAddress(file, is_loaded, load_addr);
if (error.Fail() || !is_loaded)
load_addr = base_addr;
if ((module_sp = m_process->ReadModuleFromMemory(file, load_addr)))
if (base_addr_is_offset)
{
UpdateLoadedSections(module_sp, link_map_addr, base_addr);
// Try to fetch the load address of the file from the process as we need absolute load
// address to read the file out of the memory instead of a load bias.
bool is_loaded;
lldb::addr_t load_addr;
Error error = m_process->GetFileLoadAddress(file, is_loaded, load_addr);
if (error.Success() && is_loaded)
base_addr = load_addr;
}
if ((module_sp = m_process->ReadModuleFromMemory(file, base_addr)))
{
UpdateLoadedSections(module_sp, link_map_addr, base_addr, false);
target.GetImages().AppendIfNeeded(module_sp);
}
}

20
lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/DynamicLoaderHexagonDYLD.cpp
View File

@ -177,7 +177,7 @@ DynamicLoaderHexagonDYLD::DidAttach()
// Map the loaded sections of this executable
if ( load_offset != LLDB_INVALID_ADDRESS )
UpdateLoadedSections(executable, LLDB_INVALID_ADDRESS, load_offset);
UpdateLoadedSections(executable, LLDB_INVALID_ADDRESS, load_offset, true);
// AD: confirm this?
// Load into LLDB all of the currently loaded executables in the stub
@ -268,7 +268,10 @@ DynamicLoaderHexagonDYLD::CanLoadImage()
}
void
DynamicLoaderHexagonDYLD::UpdateLoadedSections(ModuleSP module, addr_t link_map_addr, addr_t base_addr)
DynamicLoaderHexagonDYLD::UpdateLoadedSections(ModuleSP module,
addr_t link_map_addr,
addr_t base_addr,
bool base_addr_is_offset)
{
Target &target = m_process->GetTarget();
const SectionList *sections = GetSectionListFromModule(module);
@ -442,7 +445,7 @@ DynamicLoaderHexagonDYLD::RefreshModules()
for (I = m_rendezvous.loaded_begin(); I != E; ++I)
{
FileSpec file(I->path.c_str(), true);
ModuleSP module_sp = LoadModuleAtAddress(file, I->link_addr, I->base_addr);
ModuleSP module_sp = LoadModuleAtAddress(file, I->link_addr, I->base_addr, true);
if (module_sp.get())
{
loaded_modules.AppendIfNeeded( module_sp );
@ -571,7 +574,7 @@ DynamicLoaderHexagonDYLD::LoadAllCurrentModules()
{
const char *module_path = I->path.c_str();
FileSpec file(module_path, false);
ModuleSP module_sp = LoadModuleAtAddress(file, I->link_addr, I->base_addr);
ModuleSP module_sp = LoadModuleAtAddress(file, I->link_addr, I->base_addr, true);
if (module_sp.get())
{
module_list.Append(module_sp);
@ -591,7 +594,10 @@ DynamicLoaderHexagonDYLD::LoadAllCurrentModules()
/// Helper for the entry breakpoint callback. Resolves the load addresses
/// of all dependent modules.
ModuleSP
DynamicLoaderHexagonDYLD::LoadModuleAtAddress(const FileSpec &file, addr_t link_map_addr, addr_t base_addr)
DynamicLoaderHexagonDYLD::LoadModuleAtAddress(const FileSpec &file,
addr_t link_map_addr,
addr_t base_addr,
bool base_addr_is_offset)
{
Target &target = m_process->GetTarget();
ModuleList &modules = target.GetImages();
@ -602,12 +608,12 @@ DynamicLoaderHexagonDYLD::LoadModuleAtAddress(const FileSpec &file, addr_t link_
// check if module is currently loaded
if ((module_sp = modules.FindFirstModule (module_spec)))
{
UpdateLoadedSections(module_sp, link_map_addr, base_addr);
UpdateLoadedSections(module_sp, link_map_addr, base_addr, true);
}
// try to load this module from disk
else if ((module_sp = target.GetSharedModule(module_spec)))
{
UpdateLoadedSections(module_sp, link_map_addr, base_addr);
UpdateLoadedSections(module_sp, link_map_addr, base_addr, true);
}
return module_sp;

8
lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/DynamicLoaderHexagonDYLD.h
View File

@ -124,7 +124,8 @@ protected:
void
UpdateLoadedSections(lldb::ModuleSP module,
lldb::addr_t link_map_addr,
lldb::addr_t base_addr);
lldb::addr_t base_addr,
bool base_addr_is_offset) override;
/// Removes the loaded sections from the target in @p module.
///
@ -135,7 +136,10 @@ protected:
/// Locates or creates a module given by @p file and updates/loads the
/// resulting module at the virtual base address @p base_addr.
lldb::ModuleSP
LoadModuleAtAddress(const lldb_private::FileSpec &file, lldb::addr_t link_map_addr, lldb::addr_t base_addr);
LoadModuleAtAddress(const lldb_private::FileSpec &file,
lldb::addr_t link_map_addr,
lldb::addr_t base_addr,
bool base_addr_is_offset) override;
/// Callback routine invoked when we hit the breakpoint on process entry.
///

20
lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp
View File

@ -165,7 +165,7 @@ DynamicLoaderPOSIXDYLD::DidAttach()
m_process ? m_process->GetID () : LLDB_INVALID_PROCESS_ID,
executable_sp->GetFileSpec().GetPath().c_str ());
UpdateLoadedSections(executable_sp, LLDB_INVALID_ADDRESS, load_offset);
UpdateLoadedSections(executable_sp, LLDB_INVALID_ADDRESS, load_offset, true);
// When attaching to a target, there are two possible states:
// (1) We already crossed the entry point and therefore the rendezvous
@ -223,7 +223,7 @@ DynamicLoaderPOSIXDYLD::DidLaunch()
{
ModuleList module_list;
module_list.Append(executable);
UpdateLoadedSections(executable, LLDB_INVALID_ADDRESS, load_offset);
UpdateLoadedSections(executable, LLDB_INVALID_ADDRESS, load_offset, true);
if (log)
log->Printf ("DynamicLoaderPOSIXDYLD::%s about to call ProbeEntry()", __FUNCTION__);
@ -252,11 +252,13 @@ DynamicLoaderPOSIXDYLD::CanLoadImage()
}
void
DynamicLoaderPOSIXDYLD::UpdateLoadedSections(ModuleSP module, addr_t link_map_addr, addr_t base_addr)
DynamicLoaderPOSIXDYLD::UpdateLoadedSections(ModuleSP module,
addr_t link_map_addr,
addr_t base_addr,
bool base_addr_is_offset)
{
m_loaded_modules[module] = link_map_addr;
UpdateLoadedSectionsCommon(module, base_addr);
UpdateLoadedSectionsCommon(module, base_addr, base_addr_is_offset);
}
void
@ -414,7 +416,7 @@ DynamicLoaderPOSIXDYLD::RefreshModules()
E = m_rendezvous.loaded_end();
for (I = m_rendezvous.loaded_begin(); I != E; ++I)
{
ModuleSP module_sp = LoadModuleAtAddress(I->file_spec, I->link_addr, I->base_addr);
ModuleSP module_sp = LoadModuleAtAddress(I->file_spec, I->link_addr, I->base_addr, true);
if (module_sp.get())
{
loaded_modules.AppendIfNeeded(module_sp);
@ -432,8 +434,7 @@ DynamicLoaderPOSIXDYLD::RefreshModules()
for (I = m_rendezvous.unloaded_begin(); I != E; ++I)
{
ModuleSpec module_spec{I->file_spec};
ModuleSP module_sp =
loaded_modules.FindFirstModule (module_spec);
ModuleSP module_sp = loaded_modules.FindFirstModule (module_spec);
if (module_sp.get())
{
@ -520,10 +521,9 @@ DynamicLoaderPOSIXDYLD::LoadAllCurrentModules()
ModuleSP executable = GetTargetExecutable();
m_loaded_modules[executable] = m_rendezvous.GetLinkMapAddress();
for (I = m_rendezvous.begin(), E = m_rendezvous.end(); I != E; ++I)
{
ModuleSP module_sp = LoadModuleAtAddress(I->file_spec, I->link_addr, I->base_addr);
ModuleSP module_sp = LoadModuleAtAddress(I->file_spec, I->link_addr, I->base_addr, true);
if (module_sp.get())
{
module_list.Append(module_sp);

13
lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.h
View File

@ -103,7 +103,7 @@ protected:
/// Enables a breakpoint on a function called by the runtime
/// linker each time a module is loaded or unloaded.
void
virtual void
SetRendezvousBreakpoint();
/// Callback routine which updates the current list of loaded modules based
@ -126,16 +126,17 @@ protected:
/// @param link_map_addr The virtual address of the link map for the @p module.
///
/// @param base_addr The virtual base address @p module is loaded at.
virtual void
void
UpdateLoadedSections(lldb::ModuleSP module,
lldb::addr_t link_map_addr,
lldb::addr_t base_addr);
lldb::addr_t base_addr,
bool base_addr_is_offset) override;
/// Removes the loaded sections from the target in @p module.
///
/// @param module The module to traverse.
virtual void
UnloadSections(const lldb::ModuleSP module);
void
UnloadSections(const lldb::ModuleSP module) override;
/// Resolves the entry point for the current inferior process and sets a
/// breakpoint at that address.
@ -155,7 +156,7 @@ protected:
/// Helper for the entry breakpoint callback. Resolves the load addresses
/// of all dependent modules.
void
virtual void
LoadAllCurrentModules();
/// Computes a value for m_load_offset returning the computed address on

62
lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp
View File

@ -847,40 +847,52 @@ ObjectFileELF::SetLoadAddress (Target &target,
SectionList *section_list = GetSectionList ();
if (section_list)
{
if (value_is_offset)
if (!value_is_offset)
{
const size_t num_sections = section_list->GetSize();
size_t sect_idx = 0;
for (sect_idx = 0; sect_idx < num_sections; ++sect_idx)
bool found_offset = false;
for (size_t i = 0, count = GetProgramHeaderCount(); i < count; ++i)
{
// Iterate through the object file sections to find all
// of the sections that have SHF_ALLOC in their flag bits.
SectionSP section_sp (section_list->GetSectionAtIndex (sect_idx));
// if (section_sp && !section_sp->IsThreadSpecific())
if (section_sp && section_sp->Test(SHF_ALLOC))
{
lldb::addr_t load_addr = section_sp->GetFileAddress() + value;
// On 32-bit systems the load address have to fit into 4 bytes. The rest of
// the bytes are the overflow from the addition.
if (GetAddressByteSize() == 4)
load_addr &= 0xFFFFFFFF;
const elf::ELFProgramHeader* header = GetProgramHeaderByIndex(i);
if (header == nullptr)
continue;
if (target.GetSectionLoadList().SetSectionLoadAddress (section_sp, load_addr))
++num_loaded_sections;
}
if (header->p_type != PT_LOAD || header->p_offset != 0)
continue;
value = value - header->p_vaddr;
found_offset = true;
break;
}
return num_loaded_sections > 0;
if (!found_offset)
return false;
}
else
const size_t num_sections = section_list->GetSize();
size_t sect_idx = 0;
for (sect_idx = 0; sect_idx < num_sections; ++sect_idx)
{
// Not sure how to slide an ELF file given the base address
// of the ELF file in memory
// Iterate through the object file sections to find all
// of the sections that have SHF_ALLOC in their flag bits.
SectionSP section_sp (section_list->GetSectionAtIndex (sect_idx));
// if (section_sp && !section_sp->IsThreadSpecific())
if (section_sp && section_sp->Test(SHF_ALLOC))
{
lldb::addr_t load_addr = section_sp->GetFileAddress() + value;
// On 32-bit systems the load address have to fit into 4 bytes. The rest of
// the bytes are the overflow from the addition.
if (GetAddressByteSize() == 4)
load_addr &= 0xFFFFFFFF;
if (target.GetSectionLoadList().SetSectionLoadAddress (section_sp, load_addr))
++num_loaded_sections;
}
}
return num_loaded_sections > 0;
}
}
return false; // If it changed
return false;
}
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