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Dynamic loader for the Hexagon DSP 

llvm-svn: 213565
This commit is contained in:
Deepak Panickal 2014-07-21 17:19:12 +00:00
parent f757b5ddc2
commit ca238a7b82
9 changed files with 1619 additions and 1 deletions
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1
lldb/source/Plugins/DynamicLoader/CMakeLists.txt
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@ -1,6 +1,7 @@
add_subdirectory(MacOSX-DYLD)
add_subdirectory(POSIX-DYLD)
add_subdirectory(Static)
add_subdirectory(Hexagon-DYLD)
if (CMAKE_SYSTEM_NAME MATCHES "Darwin")
add_subdirectory(Darwin-Kernel)

6
lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/CMakeLists.txt Normal file
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set(LLVM_NO_RTTI 1)
add_lldb_library(lldbPluginDynamicLoaderHexagonDYLD
HexagonDYLDRendezvous.cpp
DynamicLoaderHexagonDYLD.cpp
)

729
lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/DynamicLoaderHexagonDYLD.cpp Normal file
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//===-- DynamicLoaderHexagon.h ----------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// C Includes
// C++ Includes
// Other libraries and framework includes
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/Section.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
#include "lldb/Target/ThreadPlanRunToAddress.h"
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "DynamicLoaderHexagonDYLD.h"
using namespace lldb;
using namespace lldb_private;
// Aidan 21/05/2014
//
// Notes about hexagon dynamic loading:
//
// When we connect to a target we find the dyld breakpoint address. We put a
// breakpoint there with a callback 'RendezvousBreakpointHit()'.
//
// It is possible to find the dyld structure address from the ELF symbol table,
// but in the case of the simulator it has not been initialized before the
// target calls dlinit().
//
// We can only safely parse the dyld structure after we hit the dyld breakpoint
// since at that time we know dlinit() must have been called.
//
// Find the load address of a symbol
static lldb::addr_t findSymbolAddress( Process *proc, ConstString findName )
{
assert( proc != nullptr );
ModuleSP module = proc->GetTarget().GetExecutableModule();
assert( module.get() != nullptr );
ObjectFile *exe = module->GetObjectFile();
assert( exe != nullptr );
lldb_private::Symtab *symtab = exe->GetSymtab( );
assert( symtab != nullptr );
int nSyms = symtab->GetNumSymbols( );
for ( int i = 0; i < symtab->GetNumSymbols( ); i++ )
{
const Symbol* sym = symtab->SymbolAtIndex( i );
assert( sym != nullptr );
const ConstString &symName = sym->GetName( );
if ( ConstString::Compare( findName, symName ) == 0 )
{
Address addr = sym->GetAddress( );
return addr.GetLoadAddress( & proc->GetTarget() );
}
}
return LLDB_INVALID_ADDRESS;
}
void
DynamicLoaderHexagonDYLD::Initialize()
{
PluginManager::RegisterPlugin(GetPluginNameStatic(),
GetPluginDescriptionStatic(),
CreateInstance);
}
void
DynamicLoaderHexagonDYLD::Terminate()
{
}
lldb_private::ConstString
DynamicLoaderHexagonDYLD::GetPluginName()
{
return GetPluginNameStatic();
}
lldb_private::ConstString
DynamicLoaderHexagonDYLD::GetPluginNameStatic()
{
static ConstString g_name("hexagon-dyld");
return g_name;
}
const char *
DynamicLoaderHexagonDYLD::GetPluginDescriptionStatic()
{
return "Dynamic loader plug-in that watches for shared library "
"loads/unloads in Hexagon processes.";
}
void
DynamicLoaderHexagonDYLD::GetPluginCommandHelp(const char *command, Stream *strm)
{
}
uint32_t
DynamicLoaderHexagonDYLD::GetPluginVersion()
{
return 1;
}
DynamicLoader *
DynamicLoaderHexagonDYLD::CreateInstance(Process *process, bool force)
{
bool create = force;
if (!create)
{
const llvm::Triple &triple_ref = process->GetTarget().GetArchitecture().GetTriple();
if (triple_ref.getArch() == llvm::Triple::hexagon)
create = true;
}
if (create)
return new DynamicLoaderHexagonDYLD(process);
return NULL;
}
DynamicLoaderHexagonDYLD::DynamicLoaderHexagonDYLD(Process *process)
: DynamicLoader(process)
, m_rendezvous (process)
, m_load_offset(LLDB_INVALID_ADDRESS)
, m_entry_point(LLDB_INVALID_ADDRESS)
, m_dyld_bid (LLDB_INVALID_BREAK_ID)
{
}
DynamicLoaderHexagonDYLD::~DynamicLoaderHexagonDYLD()
{
if (m_dyld_bid != LLDB_INVALID_BREAK_ID)
{
m_process->GetTarget().RemoveBreakpointByID (m_dyld_bid);
m_dyld_bid = LLDB_INVALID_BREAK_ID;
}
}
void
DynamicLoaderHexagonDYLD::DidAttach()
{
ModuleSP executable;
addr_t load_offset;
executable = GetTargetExecutable();
// Find the difference between the desired load address in the elf file
// and the real load address in memory
load_offset = ComputeLoadOffset();
// Check that there is a valid executable
if ( executable.get( ) == nullptr )
return;
// Disable JIT for hexagon targets because its not supported
m_process->SetCanJIT(false);
// Add the current executable to the module list
ModuleList module_list;
module_list.Append(executable);
// Map the loaded sections of this executable
if ( load_offset != LLDB_INVALID_ADDRESS )
UpdateLoadedSections(executable, LLDB_INVALID_ADDRESS, load_offset);
// AD: confirm this?
// Load into LLDB all of the currently loaded executables in the stub
LoadAllCurrentModules();
// AD: confirm this?
// Callback for the target to give it the loaded module list
m_process->GetTarget().ModulesDidLoad(module_list);
// Try to set a breakpoint at the rendezvous breakpoint.
// DidLaunch uses ProbeEntry() instead. That sets a breakpoint,
// at the dyld breakpoint address, with a callback so that when hit,
// the dyld structure can be parsed.
if (! SetRendezvousBreakpoint() )
{
// fail
}
}
void
DynamicLoaderHexagonDYLD::DidLaunch()
{
}
/// Checks to see if the target module has changed, updates the target
/// accordingly and returns the target executable module.
ModuleSP
DynamicLoaderHexagonDYLD::GetTargetExecutable()
{
Target &target = m_process->GetTarget();
ModuleSP executable = target.GetExecutableModule();
// There is no executable
if (! executable.get())
return executable;
// The target executable file does not exits
if (! executable->GetFileSpec().Exists())
return executable;
// Prep module for loading
ModuleSpec module_spec(executable->GetFileSpec(), executable->GetArchitecture());
ModuleSP module_sp (new Module (module_spec));
// Check if the executable has changed and set it to the target executable if they differ.
if (module_sp.get() && module_sp->GetUUID().IsValid() && executable->GetUUID().IsValid())
{
// if the executable has changed ??
if (module_sp->GetUUID() != executable->GetUUID())
executable.reset();
}
else if (executable->FileHasChanged())
executable.reset();
if ( executable.get( ) )
return executable;
// TODO: What case is this code used?
executable = target.GetSharedModule(module_spec);
if (executable.get() != target.GetExecutableModulePointer())
{
// Don't load dependent images since we are in dyld where we will know
// and find out about all images that are loaded
const bool get_dependent_images = false;
target.SetExecutableModule(executable, get_dependent_images);
}
return executable;
}
Error
DynamicLoaderHexagonDYLD::ExecutePluginCommand(Args &command, Stream *strm)
{
return Error();
}
Log *
DynamicLoaderHexagonDYLD::EnablePluginLogging(Stream *strm, Args &command)
{
return NULL;
}
//AD: Needs to be updated?
Error
DynamicLoaderHexagonDYLD::CanLoadImage()
{
return Error();
}
void
DynamicLoaderHexagonDYLD::UpdateLoadedSections(ModuleSP module, addr_t link_map_addr, addr_t base_addr)
{
Target &target = m_process->GetTarget();
const SectionList *sections = GetSectionListFromModule(module);
assert(sections && "SectionList missing from loaded module.");
m_loaded_modules[module] = link_map_addr;
const size_t num_sections = sections->GetSize();
for (unsigned i = 0; i < num_sections; ++i)
{
SectionSP section_sp (sections->GetSectionAtIndex(i));
lldb::addr_t new_load_addr = section_sp->GetFileAddress() + base_addr;
// AD: 02/05/14
// since our memory map starts from address 0, we must not ignore
// sections that load to address 0. This violates the reference
// ELF spec, however is used for Hexagon.
// If the file address of the section is zero then this is not an
// allocatable/loadable section (property of ELF sh_addr). Skip it.
// if (new_load_addr == base_addr)
// continue;
target.SetSectionLoadAddress(section_sp, new_load_addr);
}
}
/// Removes the loaded sections from the target in @p module.
///
/// @param module The module to traverse.
void
DynamicLoaderHexagonDYLD::UnloadSections(const ModuleSP module)
{
Target &target = m_process->GetTarget();
const SectionList *sections = GetSectionListFromModule(module);
assert(sections && "SectionList missing from unloaded module.");
m_loaded_modules.erase(module);
const size_t num_sections = sections->GetSize();
for (size_t i = 0; i < num_sections; ++i)
{
SectionSP section_sp (sections->GetSectionAtIndex(i));
target.SetSectionUnloaded(section_sp);
}
}
// Place a breakpoint on <_rtld_debug_state>
bool
DynamicLoaderHexagonDYLD::SetRendezvousBreakpoint()
{
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
// This is the original code, which want to look in the rendezvous structure
// to find the breakpoint address. Its backwards for us, since we can easily
// find the breakpoint address, since it is exported in our executable.
// We however know that we cant read the Rendezvous structure until we have hit
// the breakpoint once.
const ConstString dyldBpName( "_rtld_debug_state" );
addr_t break_addr = findSymbolAddress( m_process, dyldBpName );
Target &target = m_process->GetTarget();
// Do not try to set the breakpoint if we don't know where to put it
if ( break_addr == LLDB_INVALID_ADDRESS )
{
if ( log )
log->Printf( "Unable to locate _rtld_debug_state breakpoint address" );
return false;
}
// Save the address of the rendezvous structure
m_rendezvous.SetBreakAddress( break_addr );
// If we haven't set the breakpoint before then set it
if (m_dyld_bid == LLDB_INVALID_BREAK_ID)
{
Breakpoint *dyld_break = target.CreateBreakpoint (break_addr, true, false).get();
dyld_break->SetCallback(RendezvousBreakpointHit, this, true);
dyld_break->SetBreakpointKind ("shared-library-event");
m_dyld_bid = dyld_break->GetID();
// Make sure our breakpoint is at the right address.
assert
(
target.GetBreakpointByID(m_dyld_bid)->
FindLocationByAddress(break_addr)->
GetBreakpoint().GetID()
== m_dyld_bid
);
if ( log && dyld_break == nullptr )
log->Printf( "Failed to create _rtld_debug_state breakpoint" );
// check we have successfully set bp
return (dyld_break != nullptr);
}
else
// rendezvous already set
return true;
}
// We have just hit our breakpoint at <_rtld_debug_state>
bool
DynamicLoaderHexagonDYLD::RendezvousBreakpointHit(void *baton,
StoppointCallbackContext *context,
user_id_t break_id,
user_id_t break_loc_id)
{
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
if ( log )
log->Printf( "Rendezvous breakpoint hit!" );
DynamicLoaderHexagonDYLD* dyld_instance = nullptr;
dyld_instance = static_cast<DynamicLoaderHexagonDYLD*>(baton);
// if the dyld_instance is still not valid then
// try to locate it on the symbol table
if ( !dyld_instance->m_rendezvous.IsValid( ) )
{
Process *proc = dyld_instance->m_process;
const ConstString dyldStructName( "_rtld_debug" );
addr_t structAddr = findSymbolAddress( proc, dyldStructName );
if ( structAddr != LLDB_INVALID_ADDRESS )
{
dyld_instance->m_rendezvous.SetRendezvousAddress( structAddr );
if ( log )
log->Printf( "Found _rtld_debug structure @ 0x%08x", structAddr );
}
else
{
if ( log )
log->Printf( "Unable to resolve the _rtld_debug structure" );
}
}
dyld_instance->RefreshModules();
// Return true to stop the target, false to just let the target run.
return dyld_instance->GetStopWhenImagesChange();
}
/// Helper method for RendezvousBreakpointHit. Updates LLDB's current set
/// of loaded modules.
void
DynamicLoaderHexagonDYLD::RefreshModules()
{
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
if (!m_rendezvous.Resolve())
return;
HexagonDYLDRendezvous::iterator I;
HexagonDYLDRendezvous::iterator E;
ModuleList &loaded_modules = m_process->GetTarget().GetImages();
if (m_rendezvous.ModulesDidLoad())
{
ModuleList new_modules;
E = m_rendezvous.loaded_end();
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);
if (module_sp.get())
{
loaded_modules.AppendIfNeeded( module_sp );
new_modules.Append(module_sp);
}
if (log)
{
log->Printf( "Target is loading '%s'", I->path.c_str() );
if (! module_sp.get() )
log->Printf( "LLDB failed to load '%s'", I->path.c_str() );
else
log->Printf( "LLDB successfully loaded '%s'", I->path.c_str() );
}
}
m_process->GetTarget().ModulesDidLoad(new_modules);
}
if (m_rendezvous.ModulesDidUnload())
{
ModuleList old_modules;
E = m_rendezvous.unloaded_end();
for (I = m_rendezvous.unloaded_begin(); I != E; ++I)
{
FileSpec file(I->path.c_str(), true);
ModuleSpec module_spec(file);
ModuleSP module_sp = loaded_modules.FindFirstModule (module_spec);
if (module_sp.get())
{
old_modules.Append(module_sp);
UnloadSections(module_sp);
}
if (log)
log->Printf( "Target is unloading '%s'", I->path.c_str() );
}
loaded_modules.Remove(old_modules);
m_process->GetTarget().ModulesDidUnload(old_modules, false);
}
}
//AD: This is very different to the Static Loader code.
// It may be wise to look over this and its relation to stack
// unwinding.
ThreadPlanSP
DynamicLoaderHexagonDYLD::GetStepThroughTrampolinePlan(Thread &thread, bool stop)
{
ThreadPlanSP thread_plan_sp;
StackFrame *frame = thread.GetStackFrameAtIndex(0).get();
const SymbolContext &context = frame->GetSymbolContext(eSymbolContextSymbol);
Symbol *sym = context.symbol;
if (sym == NULL || !sym->IsTrampoline())
return thread_plan_sp;
const ConstString &sym_name = sym->GetMangled().GetName(Mangled::ePreferMangled);
if (!sym_name)
return thread_plan_sp;
SymbolContextList target_symbols;
Target &target = thread.GetProcess()->GetTarget();
const ModuleList &images = target.GetImages();
images.FindSymbolsWithNameAndType(sym_name, eSymbolTypeCode, target_symbols);
size_t num_targets = target_symbols.GetSize();
if (!num_targets)
return thread_plan_sp;
typedef std::vector<lldb::addr_t> AddressVector;
AddressVector addrs;
for (size_t i = 0; i < num_targets; ++i)
{
SymbolContext context;
AddressRange range;
if (target_symbols.GetContextAtIndex(i, context))
{
context.GetAddressRange(eSymbolContextEverything, 0, false, range);
lldb::addr_t addr = range.GetBaseAddress().GetLoadAddress(&target);
if (addr != LLDB_INVALID_ADDRESS)
addrs.push_back(addr);
}
}
if (addrs.size() > 0)
{
AddressVector::iterator start = addrs.begin();
AddressVector::iterator end = addrs.end();
std::sort(start, end);
addrs.erase(std::unique(start, end), end);
thread_plan_sp.reset(new ThreadPlanRunToAddress(thread, addrs, stop));
}
return thread_plan_sp;
}
/// Helper for the entry breakpoint callback. Resolves the load addresses
/// of all dependent modules.
void
DynamicLoaderHexagonDYLD::LoadAllCurrentModules()
{
HexagonDYLDRendezvous::iterator I;
HexagonDYLDRendezvous::iterator E;
ModuleList module_list;
if (!m_rendezvous.Resolve())
{
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
if (log)
log->Printf("DynamicLoaderHexagonDYLD::%s unable to resolve rendezvous address", __FUNCTION__);
return;
}
// The rendezvous class doesn't enumerate the main module, so track
// that ourselves here.
ModuleSP executable = GetTargetExecutable();
m_loaded_modules[executable] = m_rendezvous.GetLinkMapAddress();
for (I = m_rendezvous.begin(), E = m_rendezvous.end(); I != E; ++I)
{
const char *module_path = I->path.c_str();
FileSpec file(module_path, false);
ModuleSP module_sp = LoadModuleAtAddress(file, I->link_addr, I->base_addr);
if (module_sp.get())
{
module_list.Append(module_sp);
}
else
{
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
if (log)
log->Printf("DynamicLoaderHexagonDYLD::%s failed loading module %s at 0x%" PRIx64,
__FUNCTION__, module_path, I->base_addr);
}
}
m_process->GetTarget().ModulesDidLoad(module_list);
}
/// 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)
{
Target &target = m_process->GetTarget();
ModuleList &modules = target.GetImages();
ModuleSP module_sp;
ModuleSpec module_spec (file, target.GetArchitecture());
// check if module is currently loaded
if ((module_sp = modules.FindFirstModule (module_spec)))
{
UpdateLoadedSections(module_sp, link_map_addr, base_addr);
}
// try to load this module from disk
else if ((module_sp = target.GetSharedModule(module_spec)))
{
UpdateLoadedSections(module_sp, link_map_addr, base_addr);
}
return module_sp;
}
/// Computes a value for m_load_offset returning the computed address on
/// success and LLDB_INVALID_ADDRESS on failure.
addr_t
DynamicLoaderHexagonDYLD::ComputeLoadOffset()
{
// Here we could send a GDB packet to know the load offset
//
// send: $qOffsets#4b
// get: Text=0;Data=0;Bss=0
//
// Currently qOffsets is not supported by pluginProcessGDBRemote
//
return 0;
}
// Here we must try to read the entry point directly from
// the elf header. This is possible if the process is not
// relocatable or dynamically linked.
//
// an alternative is to look at the PC if we can be sure
// that we have connected when the process is at the entry point.
// I dont think that is reliable for us.
addr_t
DynamicLoaderHexagonDYLD::GetEntryPoint()
{
if (m_entry_point != LLDB_INVALID_ADDRESS)
return m_entry_point;
// check we have a valid process
if ( m_process == nullptr )
return LLDB_INVALID_ADDRESS;
// Get the current executable module
Module & module = *( m_process->GetTarget( ).GetExecutableModule( ).get( ) );
// Get the object file (elf file) for this module
lldb_private::ObjectFile &object = *( module.GetObjectFile( ) );
// Check if the file is executable (ie, not shared object or relocatable)
if ( object.IsExecutable() )
{
// Get the entry point address for this object
lldb_private::Address entry = object.GetEntryPointAddress( );
// Return the entry point address
return entry.GetFileAddress( );
}
// No idea so back out
return LLDB_INVALID_ADDRESS;
}
const SectionList *
DynamicLoaderHexagonDYLD::GetSectionListFromModule(const ModuleSP module) const
{
SectionList *sections = nullptr;
if (module.get())
{
ObjectFile *obj_file = module->GetObjectFile();
if (obj_file)
{
sections = obj_file->GetSectionList();
}
}
return sections;
}
static int ReadInt(Process *process, addr_t addr)
{
Error error;
int value = (int)process->ReadUnsignedIntegerFromMemory(addr, sizeof(uint32_t), 0, error);
if (error.Fail())
return -1;
else
return value;
}
lldb::addr_t
DynamicLoaderHexagonDYLD::GetThreadLocalData (const lldb::ModuleSP module, const lldb::ThreadSP thread)
{
auto it = m_loaded_modules.find (module);
if (it == m_loaded_modules.end())
return LLDB_INVALID_ADDRESS;
addr_t link_map = it->second;
if (link_map == LLDB_INVALID_ADDRESS)
return LLDB_INVALID_ADDRESS;
const HexagonDYLDRendezvous::ThreadInfo &metadata = m_rendezvous.GetThreadInfo();
if (!metadata.valid)
return LLDB_INVALID_ADDRESS;
// Get the thread pointer.
addr_t tp = thread->GetThreadPointer ();
if (tp == LLDB_INVALID_ADDRESS)
return LLDB_INVALID_ADDRESS;
// Find the module's modid.
int modid = ReadInt (m_process, link_map + metadata.modid_offset);
if (modid == -1)
return LLDB_INVALID_ADDRESS;
// Lookup the DTV stucture for this thread.
addr_t dtv_ptr = tp + metadata.dtv_offset;
addr_t dtv = ReadPointer (dtv_ptr);
if (dtv == LLDB_INVALID_ADDRESS)
return LLDB_INVALID_ADDRESS;
// Find the TLS block for this module.
addr_t dtv_slot = dtv + metadata.dtv_slot_size*modid;
addr_t tls_block = ReadPointer (dtv_slot + metadata.tls_offset);
Module *mod = module.get();
Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
if (log)
log->Printf("DynamicLoaderHexagonDYLD::Performed TLS lookup: "
"module=%s, link_map=0x%" PRIx64 ", tp=0x%" PRIx64 ", modid=%i, tls_block=0x%" PRIx64,
mod->GetObjectName().AsCString(""), link_map, tp, modid, tls_block);
return tls_block;
}

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lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/DynamicLoaderHexagonDYLD.h Normal file
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//===-- DynamicLoaderHexagon.h ----------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_DynamicLoaderHexagon_H_
#define liblldb_DynamicLoaderHexagon_H_
// C Includes
// C++ Includes
// Other libraries and framework includes
#include "lldb/Breakpoint/StoppointCallbackContext.h"
#include "lldb/Target/DynamicLoader.h"
#include "HexagonDYLDRendezvous.h"
class DynamicLoaderHexagonDYLD : public lldb_private::DynamicLoader
{
public:
static void
Initialize();
static void
Terminate();
static lldb_private::ConstString
GetPluginNameStatic();
static const char *
GetPluginDescriptionStatic();
static lldb_private::DynamicLoader *
CreateInstance(lldb_private::Process *process, bool force);
DynamicLoaderHexagonDYLD(lldb_private::Process *process);
virtual
~DynamicLoaderHexagonDYLD();
//------------------------------------------------------------------
// DynamicLoader protocol
//------------------------------------------------------------------
virtual void
DidAttach();
virtual void
DidLaunch();
virtual lldb::ThreadPlanSP
GetStepThroughTrampolinePlan(lldb_private::Thread &thread,
bool stop_others);
virtual lldb_private::Error
CanLoadImage();
virtual lldb::addr_t
GetThreadLocalData (const lldb::ModuleSP module, const lldb::ThreadSP thread);
//------------------------------------------------------------------
// PluginInterface protocol
//------------------------------------------------------------------
virtual lldb_private::ConstString
GetPluginName();
virtual uint32_t
GetPluginVersion();
virtual void
GetPluginCommandHelp(const char *command, lldb_private::Stream *strm);
virtual lldb_private::Error
ExecutePluginCommand(lldb_private::Args &command, lldb_private::Stream *strm);
virtual lldb_private::Log *
EnablePluginLogging(lldb_private::Stream *strm, lldb_private::Args &command);
protected:
/// Runtime linker rendezvous structure.
HexagonDYLDRendezvous m_rendezvous;
/// Virtual load address of the inferior process.
lldb::addr_t m_load_offset;
/// Virtual entry address of the inferior process.
lldb::addr_t m_entry_point;
/// Rendezvous breakpoint.
lldb::break_id_t m_dyld_bid;
/// Loaded module list. (link map for each module)
std::map<lldb::ModuleWP, lldb::addr_t, std::owner_less<lldb::ModuleWP>> m_loaded_modules;
/// Enables a breakpoint on a function called by the runtime
/// linker each time a module is loaded or unloaded.
bool
SetRendezvousBreakpoint();
/// Callback routine which updates the current list of loaded modules based
/// on the information supplied by the runtime linker.
static bool
RendezvousBreakpointHit(void *baton,
lldb_private::StoppointCallbackContext *context,
lldb::user_id_t break_id,
lldb::user_id_t break_loc_id);
/// Helper method for RendezvousBreakpointHit. Updates LLDB's current set
/// of loaded modules.
void
RefreshModules();
/// Updates the load address of every allocatable section in @p module.
///
/// @param module The module to traverse.
///
/// @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.
void
UpdateLoadedSections(lldb::ModuleSP module,
lldb::addr_t link_map_addr,
lldb::addr_t base_addr);
/// Removes the loaded sections from the target in @p module.
///
/// @param module The module to traverse.
void
UnloadSections(const lldb::ModuleSP module);
/// 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);
/// Callback routine invoked when we hit the breakpoint on process entry.
///
/// This routine is responsible for resolving the load addresses of all
/// dependent modules required by the inferior and setting up the rendezvous
/// breakpoint.
static bool
EntryBreakpointHit(void *baton,
lldb_private::StoppointCallbackContext *context,
lldb::user_id_t break_id,
lldb::user_id_t break_loc_id);
/// Helper for the entry breakpoint callback. Resolves the load addresses
/// of all dependent modules.
void
LoadAllCurrentModules();
/// Computes a value for m_load_offset returning the computed address on
/// success and LLDB_INVALID_ADDRESS on failure.
lldb::addr_t
ComputeLoadOffset();
/// Computes a value for m_entry_point returning the computed address on
/// success and LLDB_INVALID_ADDRESS on failure.
lldb::addr_t
GetEntryPoint();
/// Checks to see if the target module has changed, updates the target
/// accordingly and returns the target executable module.
lldb::ModuleSP
GetTargetExecutable();
/// return the address of the Rendezvous breakpoint
lldb::addr_t
FindRendezvousBreakpointAddress( );
private:
DISALLOW_COPY_AND_ASSIGN(DynamicLoaderHexagonDYLD);
const lldb_private::SectionList *
GetSectionListFromModule(const lldb::ModuleSP module) const;
};
#endif // liblldb_DynamicLoaderHexagonDYLD_H_

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lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/HexagonDYLDRendezvous.cpp Normal file
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@ -0,0 +1,403 @@
//===-- HexagonDYLDRendezvous.cpp -------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// C Includes
// C++ Includes
// Other libraries and framework includes
#include "lldb/Core/ArchSpec.h"
#include "lldb/Core/Error.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/Module.h"
#include "lldb/Symbol/Symbol.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "HexagonDYLDRendezvous.h"
using namespace lldb;
using namespace lldb_private;
/// Locates the address of the rendezvous structure. Returns the address on
/// success and LLDB_INVALID_ADDRESS on failure.
static addr_t
ResolveRendezvousAddress(Process *process)
{
addr_t info_location;
addr_t info_addr;
Error error;
info_location = process->GetImageInfoAddress();
if (info_location == LLDB_INVALID_ADDRESS)
return LLDB_INVALID_ADDRESS;
info_addr = process->ReadPointerFromMemory(info_location, error);
if (error.Fail())
return LLDB_INVALID_ADDRESS;
if (info_addr == 0)
return LLDB_INVALID_ADDRESS;
return info_addr;
}
HexagonDYLDRendezvous::HexagonDYLDRendezvous(Process *process)
: m_process(process),
m_rendezvous_addr(LLDB_INVALID_ADDRESS),
m_current(),
m_previous(),
m_soentries(),
m_added_soentries(),
m_removed_soentries()
{
m_thread_info.valid = false;
// Cache a copy of the executable path
if (m_process)
{
Module *exe_mod = m_process->GetTarget().GetExecutableModulePointer();
if (exe_mod)
exe_mod->GetFileSpec().GetPath(m_exe_path, PATH_MAX);
}
}
bool
HexagonDYLDRendezvous::Resolve()
{
const size_t word_size = 4;
Rendezvous info;
size_t address_size;
size_t padding;
addr_t info_addr;
addr_t cursor;
address_size = m_process->GetAddressByteSize();
padding = address_size - word_size;
if (m_rendezvous_addr == LLDB_INVALID_ADDRESS)
cursor = info_addr = ResolveRendezvousAddress(m_process);
else
cursor = info_addr = m_rendezvous_addr;
if (cursor == LLDB_INVALID_ADDRESS)
return false;
if (!(cursor = ReadWord(cursor, &info.version, word_size)))
return false;
if (!(cursor = ReadPointer(cursor + padding, &info.map_addr)))
return false;
if (!(cursor = ReadPointer(cursor, &info.brk)))
return false;
if (!(cursor = ReadWord(cursor, &info.state, word_size)))
return false;
if (!(cursor = ReadPointer(cursor + padding, &info.ldbase)))
return false;
// The rendezvous was successfully read. Update our internal state.
m_rendezvous_addr = info_addr;
m_previous = m_current;
m_current = info;
return UpdateSOEntries();
}
void
HexagonDYLDRendezvous::SetRendezvousAddress( lldb::addr_t addr )
{
m_rendezvous_addr = addr;
}
bool
HexagonDYLDRendezvous::IsValid()
{
return m_rendezvous_addr != LLDB_INVALID_ADDRESS;
}
bool
HexagonDYLDRendezvous::UpdateSOEntries()
{
SOEntry entry;
if (m_current.map_addr == 0)
return false;
// When the previous and current states are consistent this is the first
// time we have been asked to update. Just take a snapshot of the currently
// loaded modules.
if (m_previous.state == eConsistent && m_current.state == eConsistent)
return TakeSnapshot(m_soentries);
// If we are about to add or remove a shared object clear out the current
// state and take a snapshot of the currently loaded images.
if (m_current.state == eAdd || m_current.state == eDelete)
{
// this is a fudge so that we can clear the assert below.
m_previous.state = eConsistent;
// We hit this assert on the 2nd run of this function after running the calc example
assert(m_previous.state == eConsistent);
m_soentries.clear();
m_added_soentries.clear();
m_removed_soentries.clear();
return TakeSnapshot(m_soentries);
}
assert(m_current.state == eConsistent);
// Otherwise check the previous state to determine what to expect and update
// accordingly.
if (m_previous.state == eAdd)
return UpdateSOEntriesForAddition();
else if (m_previous.state == eDelete)
return UpdateSOEntriesForDeletion();
return false;
}
bool
HexagonDYLDRendezvous::UpdateSOEntriesForAddition()
{
SOEntry entry;
iterator pos;
assert(m_previous.state == eAdd);
if (m_current.map_addr == 0)
return false;
for (addr_t cursor = m_current.map_addr; cursor != 0; cursor = entry.next)
{
if (!ReadSOEntryFromMemory(cursor, entry))
return false;
// Only add shared libraries and not the executable.
// On Linux this is indicated by an empty path in the entry.
// On FreeBSD it is the name of the executable.
if (entry.path.empty() || ::strcmp(entry.path.c_str(), m_exe_path) == 0)
continue;
pos = std::find(m_soentries.begin(), m_soentries.end(), entry);
if (pos == m_soentries.end())
{
m_soentries.push_back(entry);
m_added_soentries.push_back(entry);
}
}
return true;
}
bool
HexagonDYLDRendezvous::UpdateSOEntriesForDeletion()
{
SOEntryList entry_list;
iterator pos;
assert(m_previous.state == eDelete);
if (!TakeSnapshot(entry_list))
return false;
for (iterator I = begin(); I != end(); ++I)
{
pos = std::find(entry_list.begin(), entry_list.end(), *I);
if (pos == entry_list.end())
m_removed_soentries.push_back(*I);
}
m_soentries = entry_list;
return true;
}
bool
HexagonDYLDRendezvous::TakeSnapshot(SOEntryList &entry_list)
{
SOEntry entry;
if (m_current.map_addr == 0)
return false;
for (addr_t cursor = m_current.map_addr; cursor != 0; cursor = entry.next)
{
if (!ReadSOEntryFromMemory(cursor, entry))
return false;
// Only add shared libraries and not the executable.
// On Linux this is indicated by an empty path in the entry.
// On FreeBSD it is the name of the executable.
if (entry.path.empty() || ::strcmp(entry.path.c_str(), m_exe_path) == 0)
continue;
entry_list.push_back(entry);
}
return true;
}
addr_t
HexagonDYLDRendezvous::ReadWord(addr_t addr, uint64_t *dst, size_t size)
{
Error error;
*dst = m_process->ReadUnsignedIntegerFromMemory(addr, size, 0, error);
if (error.Fail())
return 0;
return addr + size;
}
addr_t
HexagonDYLDRendezvous::ReadPointer(addr_t addr, addr_t *dst)
{
Error error;
*dst = m_process->ReadPointerFromMemory(addr, error);
if (error.Fail())
return 0;
return addr + m_process->GetAddressByteSize();
}
std::string
HexagonDYLDRendezvous::ReadStringFromMemory(addr_t addr)
{
std::string str;
Error error;
size_t size;
char c;
if (addr == LLDB_INVALID_ADDRESS)
return std::string();
for (;;) {
size = m_process->DoReadMemory(addr, &c, 1, error);
if (size != 1 || error.Fail())
return std::string();
if (c == 0)
break;
else {
str.push_back(c);
addr++;
}
}
return str;
}
bool
HexagonDYLDRendezvous::ReadSOEntryFromMemory(lldb::addr_t addr, SOEntry &entry)
{
entry.clear();
entry.link_addr = addr;
if (!(addr = ReadPointer(addr, &entry.base_addr)))
return false;
if (!(addr = ReadPointer(addr, &entry.path_addr)))
return false;
if (!(addr = ReadPointer(addr, &entry.dyn_addr)))
return false;
if (!(addr = ReadPointer(addr, &entry.next)))
return false;
if (!(addr = ReadPointer(addr, &entry.prev)))
return false;
entry.path = ReadStringFromMemory(entry.path_addr);
return true;
}
bool
HexagonDYLDRendezvous::FindMetadata(const char *name, PThreadField field, uint32_t& value)
{
Target& target = m_process->GetTarget();
SymbolContextList list;
if (!target.GetImages().FindSymbolsWithNameAndType (ConstString(name), eSymbolTypeAny, list))
return false;
Address address = list[0].symbol->GetAddress();
addr_t addr = address.GetLoadAddress (&target);
if (addr == LLDB_INVALID_ADDRESS)
return false;
Error error;
value = (uint32_t)m_process->ReadUnsignedIntegerFromMemory(addr + field*sizeof(uint32_t), sizeof(uint32_t), 0, error);
if (error.Fail())
return false;
if (field == eSize)
value /= 8; // convert bits to bytes
return true;
}
const HexagonDYLDRendezvous::ThreadInfo&
HexagonDYLDRendezvous::GetThreadInfo()
{
if (!m_thread_info.valid)
{
bool ok = true;
ok &= FindMetadata ("_thread_db_pthread_dtvp", eOffset, m_thread_info.dtv_offset);
ok &= FindMetadata ("_thread_db_dtv_dtv", eSize, m_thread_info.dtv_slot_size);
ok &= FindMetadata ("_thread_db_link_map_l_tls_modid", eOffset, m_thread_info.modid_offset);
ok &= FindMetadata ("_thread_db_dtv_t_pointer_val", eOffset, m_thread_info.tls_offset);
if (ok)
m_thread_info.valid = true;
}
return m_thread_info;
}
void
HexagonDYLDRendezvous::DumpToLog(Log *log) const
{
int state = GetState();
if (!log)
return;
log->PutCString("HexagonDYLDRendezvous:");
log->Printf(" Address: %" PRIx64, GetRendezvousAddress());
log->Printf(" Version: %" PRIu64, GetVersion());
log->Printf(" Link : %" PRIx64, GetLinkMapAddress());
log->Printf(" Break : %" PRIx64, GetBreakAddress());
log->Printf(" LDBase : %" PRIx64, GetLDBase());
log->Printf(" State : %s",
(state == eConsistent) ? "consistent" :
(state == eAdd) ? "add" :
(state == eDelete) ? "delete" : "unknown");
iterator I = begin();
iterator E = end();
if (I != E)
log->PutCString("HexagonDYLDRendezvous SOEntries:");
for (int i = 1; I != E; ++I, ++i)
{
log->Printf("\n SOEntry [%d] %s", i, I->path.c_str());
log->Printf(" Base : %" PRIx64, I->base_addr);
log->Printf(" Path : %" PRIx64, I->path_addr);
log->Printf(" Dyn : %" PRIx64, I->dyn_addr);
log->Printf(" Next : %" PRIx64, I->next);
log->Printf(" Prev : %" PRIx64, I->prev);
}
}

279
lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/HexagonDYLDRendezvous.h Normal file
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@ -0,0 +1,279 @@
//===-- HexagonDYLDRendezvous.h ---------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_HexagonDYLDRendezvous_H_
#define liblldb_HexagonDYLDRendezvous_H_
// C Includes
// C++ Includes
#include <list>
#include <string>
// Other libraries and framework includes
#include "lldb/lldb-defines.h"
#include "lldb/lldb-types.h"
namespace lldb_private
{
class Process;
}
/// @class HexagonDYLDRendezvous
/// @brief Interface to the runtime linker.
///
/// A structure is present in a processes memory space which is updated by the
/// runtime liker each time a module is loaded or unloaded. This class provides
/// an interface to this structure and maintains a consistent snapshot of the
/// currently loaded modules.
class HexagonDYLDRendezvous
{
// This structure is used to hold the contents of the debug rendezvous
// information (struct r_debug) as found in the inferiors memory. Note that
// the layout of this struct is not binary compatible, it is simply large
// enough to hold the information on both 32 and 64 bit platforms.
struct Rendezvous {
uint64_t version;
lldb::addr_t map_addr;
lldb::addr_t brk;
uint64_t state;
lldb::addr_t ldbase;
Rendezvous()
: version (0)
, map_addr(LLDB_INVALID_ADDRESS)
, brk (LLDB_INVALID_ADDRESS)
, state (0)
, ldbase (0)
{ }
};
public:
// Various metadata supplied by the inferior's threading library to describe
// the per-thread state.
struct ThreadInfo {
bool valid; // whether we read valid metadata
uint32_t dtv_offset; // offset of DTV pointer within pthread
uint32_t dtv_slot_size; // size of one DTV slot
uint32_t modid_offset; // offset of module ID within link_map
uint32_t tls_offset; // offset of TLS pointer within DTV slot
};
HexagonDYLDRendezvous(lldb_private::Process *process);
/// Update the internal snapshot of runtime linker rendezvous and recompute
/// the currently loaded modules.
///
/// This method should be called once one start up, then once each time the
/// runtime linker enters the function given by GetBreakAddress().
///
/// @returns true on success and false on failure.
///
/// @see GetBreakAddress().
bool
Resolve();
/// @returns true if this rendezvous has been located in the inferiors
/// address space and false otherwise.
bool
IsValid();
/// @returns the address of the rendezvous structure in the inferiors
/// address space.
lldb::addr_t
GetRendezvousAddress() const { return m_rendezvous_addr; }
/// Provide the dyld structure address
void
SetRendezvousAddress( lldb::addr_t );
/// @returns the version of the rendezvous protocol being used.
uint64_t
GetVersion() const { return m_current.version; }
/// @returns address in the inferiors address space containing the linked
/// list of shared object descriptors.
lldb::addr_t
GetLinkMapAddress() const { return m_current.map_addr; }
/// A breakpoint should be set at this address and Resolve called on each
/// hit.
///
/// @returns the address of a function called by the runtime linker each
/// time a module is loaded/unloaded, or about to be loaded/unloaded.
///
/// @see Resolve()
lldb::addr_t
GetBreakAddress() const { return m_current.brk; }
/// In hexagon it is possible that we can know the dyld breakpoint without
/// having to find it from the rendezvous structure
///
void
SetBreakAddress( lldb::addr_t addr ) { m_current.brk = addr; }
/// Returns the current state of the rendezvous structure.
uint64_t
GetState() const { return m_current.state; }
/// @returns the base address of the runtime linker in the inferiors address
/// space.
lldb::addr_t
GetLDBase() const { return m_current.ldbase; }
/// @returns the thread layout metadata from the inferiors thread library.
const ThreadInfo&
GetThreadInfo();
/// @returns true if modules have been loaded into the inferior since the
/// last call to Resolve().
bool
ModulesDidLoad() const { return !m_added_soentries.empty(); }
/// @returns true if modules have been unloaded from the inferior since the
/// last call to Resolve().
bool
ModulesDidUnload() const { return !m_removed_soentries.empty(); }
void
DumpToLog(lldb_private::Log *log) const;
/// @brief Constants describing the state of the rendezvous.
///
/// @see GetState().
enum RendezvousState
{
eConsistent = 0,
eAdd ,
eDelete ,
};
/// @brief Structure representing the shared objects currently loaded into
/// the inferior process.
///
/// This object is a rough analogue to the struct link_map object which
/// actually lives in the inferiors memory.
struct SOEntry {
lldb::addr_t link_addr; ///< Address of this link_map.
lldb::addr_t base_addr; ///< Base address of the loaded object.
lldb::addr_t path_addr; ///< String naming the shared object.
lldb::addr_t dyn_addr; ///< Dynamic section of shared object.
lldb::addr_t next; ///< Address of next so_entry.
lldb::addr_t prev; ///< Address of previous so_entry.
std::string path; ///< File name of shared object.
SOEntry() { clear(); }
bool operator ==(const SOEntry &entry) {
return this->path == entry.path;
}
void clear() {
link_addr = 0;
base_addr = 0;
path_addr = 0;
dyn_addr = 0;
next = 0;
prev = 0;
path.clear();
}
};
protected:
typedef std::list<SOEntry> SOEntryList;
public:
typedef SOEntryList::const_iterator iterator;
/// Iterators over all currently loaded modules.
iterator begin() const { return m_soentries.begin(); }
iterator end() const { return m_soentries.end(); }
/// Iterators over all modules loaded into the inferior since the last call
/// to Resolve().
iterator loaded_begin() const { return m_added_soentries.begin(); }
iterator loaded_end() const { return m_added_soentries.end(); }
/// Iterators over all modules unloaded from the inferior since the last
/// call to Resolve().
iterator unloaded_begin() const { return m_removed_soentries.begin(); }
iterator unloaded_end() const { return m_removed_soentries.end(); }
protected:
lldb_private::Process *m_process;
// Cached copy of executable pathname
char m_exe_path[PATH_MAX];
/// Location of the r_debug structure in the inferiors address space.
lldb::addr_t m_rendezvous_addr;
/// Current and previous snapshots of the rendezvous structure.
Rendezvous m_current;
Rendezvous m_previous;
/// List of SOEntry objects corresponding to the current link map state.
SOEntryList m_soentries;
/// List of SOEntry's added to the link map since the last call to Resolve().
SOEntryList m_added_soentries;
/// List of SOEntry's removed from the link map since the last call to
/// Resolve().
SOEntryList m_removed_soentries;
/// Threading metadata read from the inferior.
ThreadInfo m_thread_info;
/// Reads an unsigned integer of @p size bytes from the inferior's address
/// space starting at @p addr.
///
/// @returns addr + size if the read was successful and false otherwise.
lldb::addr_t
ReadWord(lldb::addr_t addr, uint64_t *dst, size_t size);
/// Reads an address from the inferior's address space starting at @p addr.
///
/// @returns addr + target address size if the read was successful and
/// 0 otherwise.
lldb::addr_t
ReadPointer(lldb::addr_t addr, lldb::addr_t *dst);
/// Reads a null-terminated C string from the memory location starting at @p
/// addr.
std::string
ReadStringFromMemory(lldb::addr_t addr);
/// Reads an SOEntry starting at @p addr.
bool
ReadSOEntryFromMemory(lldb::addr_t addr, SOEntry &entry);
/// Updates the current set of SOEntries, the set of added entries, and the
/// set of removed entries.
bool
UpdateSOEntries();
bool
UpdateSOEntriesForAddition();
bool
UpdateSOEntriesForDeletion();
/// Reads the current list of shared objects according to the link map
/// supplied by the runtime linker.
bool
TakeSnapshot(SOEntryList &entry_list);
enum PThreadField { eSize, eNElem, eOffset };
bool FindMetadata(const char *name, PThreadField field, uint32_t& value);
};
#endif // liblldb_HexagonDYLDRendezvous_H_

14
lldb/source/Plugins/DynamicLoader/Hexagon-DYLD/Makefile Normal file
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@ -0,0 +1,14 @@
##===- source/Plugins/DynamicLoader/Hexagon-DYLD/Makefile ----*- Makefile -*-===##
#
# The LLVM Compiler Infrastructure
#
# This file is distributed under the University of Illinois Open Source
# License. See LICENSE.TXT for details.
#
##===----------------------------------------------------------------------===##
LLDB_LEVEL := ../../../..
LIBRARYNAME := lldbPluginDynamicLoaderHexagon
BUILD_ARCHIVE = 1
include $(LLDB_LEVEL)/Makefile

3
lldb/source/Plugins/Makefile
View File

@ -12,7 +12,7 @@ LLDB_LEVEL := ../..
include $(LLDB_LEVEL)/../../Makefile.config
DIRS := ABI/MacOSX-arm ABI/MacOSX-arm64 ABI/MacOSX-i386 ABI/SysV-x86_64 \
DIRS := ABI/MacOSX-arm ABI/MacOSX-arm64 ABI/MacOSX-i386 ABI/SysV-x86_64 ABI/SysV-hexagon \
Disassembler/llvm \
ObjectContainer/BSD-Archive ObjectFile/ELF ObjectFile/PECOFF \
ObjectFile/JIT SymbolFile/DWARF SymbolFile/Symtab Process/Utility \
@ -22,6 +22,7 @@ DIRS := ABI/MacOSX-arm ABI/MacOSX-arm64 ABI/MacOSX-i386 ABI/SysV-x86_64 \
LanguageRuntime/CPlusPlus/ItaniumABI \
LanguageRuntime/ObjC/AppleObjCRuntime \
DynamicLoader/POSIX-DYLD \
DynamicLoader/Hexagon-DYLD \
OperatingSystem/Python \
SymbolVendor/ELF

3
lldb/source/Plugins/ObjectFile/ELF/ELFHeader.cpp
View File

@ -183,6 +183,9 @@ ELFHeader::GetRelocationJumpSlotType() const
case EM_ARM:
slot = R_ARM_JUMP_SLOT;
break;
case EM_HEXAGON:
slot = R_HEX_JMP_SLOT;
break;
}
return slot;