bool
ABIMacOSX_arm::PrepareTrivialCall (Thread &thread,
addr_t sp,
addr_t function_addr,
addr_t return_addr,
llvm::ArrayRef<addr_t> args) const
{
RegisterContext *reg_ctx = thread.GetRegisterContext().get();
if (!reg_ctx)
return false;
const uint32_t pc_reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
const uint32_t sp_reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP);
const uint32_t ra_reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA);
RegisterValue reg_value;
const char *reg_names[] = { "r0", "r1", "r2", "r3" };
llvm::ArrayRef<addr_t>::iterator ai = args.begin(), ae = args.end();
for (size_t i = 0; i < llvm::array_lengthof(reg_names); ++i)
{
if (ai == ae)
break;
reg_value.SetUInt32(*ai);
if (!reg_ctx->WriteRegister(reg_ctx->GetRegisterInfoByName(reg_names[i]), reg_value))
return false;
++ai;
}
if (ai != ae)
{
// Spill onto the stack
size_t num_stack_regs = ae - ai;
sp -= (num_stack_regs * 4);
// Keep the stack 8 byte aligned, not that we need to
sp &= ~(8ull-1ull);
// just using arg1 to get the right size
const RegisterInfo *reg_info = reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1);
addr_t arg_pos = sp;
for (; ai != ae; ++ai)
{
reg_value.SetUInt32(*ai);
if (reg_ctx->WriteRegisterValueToMemory(reg_info, arg_pos, reg_info->byte_size, reg_value).Fail())
return false;
arg_pos += reg_info->byte_size;
}
}
TargetSP target_sp (thread.CalculateTarget());
Address so_addr;
// Figure out if our return address is ARM or Thumb by using the
// Address::GetCallableLoadAddress(Target*) which will figure out the ARM
// thumb-ness and set the correct address bits for us.
so_addr.SetLoadAddress (return_addr, target_sp.get());
return_addr = so_addr.GetCallableLoadAddress (target_sp.get());
// Set "lr" to the return address
if (!reg_ctx->WriteRegisterFromUnsigned (ra_reg_num, return_addr))
return false;
// Set "sp" to the requested value
if (!reg_ctx->WriteRegisterFromUnsigned (sp_reg_num, sp))
return false;
// If bit zero or 1 is set, this must be a thumb function, no need to figure
// this out from the symbols.
so_addr.SetLoadAddress (function_addr, target_sp.get());
function_addr = so_addr.GetCallableLoadAddress (target_sp.get());
const RegisterInfo *cpsr_reg_info = reg_ctx->GetRegisterInfoByName("cpsr");
const uint32_t curr_cpsr = reg_ctx->ReadRegisterAsUnsigned(cpsr_reg_info, 0);
// Make a new CPSR and mask out any Thumb IT (if/then) bits
uint32_t new_cpsr = curr_cpsr & ~MASK_CPSR_IT_MASK;
// If bit zero or 1 is set, this must be thumb...
if (function_addr & 1ull)
new_cpsr |= MASK_CPSR_T; // Set T bit in CPSR
else
new_cpsr &= ~MASK_CPSR_T; // Clear T bit in CPSR
if (new_cpsr != curr_cpsr)
{
if (!reg_ctx->WriteRegisterFromUnsigned (cpsr_reg_info, new_cpsr))
return false;
}
function_addr &= ~1ull; // clear bit zero since the CPSR will take care of the mode for us
// Set "pc" to the address requested
if (!reg_ctx->WriteRegisterFromUnsigned (pc_reg_num, function_addr))
return false;
//.........这里部分代码省略.........
bool
ABISysV_ppc::GetArgumentValues (Thread &thread,
ValueList &values) const
{
unsigned int num_values = values.GetSize();
unsigned int value_index;
// Extract the register context so we can read arguments from registers
RegisterContext *reg_ctx = thread.GetRegisterContext().get();
if (!reg_ctx)
return false;
// Get the pointer to the first stack argument so we have a place to start
// when reading data
addr_t sp = reg_ctx->GetSP(0);
if (!sp)
return false;
addr_t current_stack_argument = sp + 48; // jump over return address
uint32_t argument_register_ids[8];
argument_register_ids[0] = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1)->kinds[eRegisterKindLLDB];
argument_register_ids[1] = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG2)->kinds[eRegisterKindLLDB];
argument_register_ids[2] = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG3)->kinds[eRegisterKindLLDB];
argument_register_ids[3] = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG4)->kinds[eRegisterKindLLDB];
argument_register_ids[4] = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG5)->kinds[eRegisterKindLLDB];
argument_register_ids[5] = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG6)->kinds[eRegisterKindLLDB];
argument_register_ids[6] = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG7)->kinds[eRegisterKindLLDB];
argument_register_ids[7] = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG8)->kinds[eRegisterKindLLDB];
unsigned int current_argument_register = 0;
for (value_index = 0;
value_index < num_values;
++value_index)
{
Value *value = values.GetValueAtIndex(value_index);
if (!value)
return false;
// We currently only support extracting values with Clang QualTypes.
// Do we care about others?
ClangASTType clang_type = value->GetClangType();
if (!clang_type)
return false;
bool is_signed;
if (clang_type.IsIntegerType (is_signed))
{
ReadIntegerArgument(value->GetScalar(),
clang_type.GetBitSize(&thread),
is_signed,
thread,
argument_register_ids,
current_argument_register,
current_stack_argument);
}
else if (clang_type.IsPointerType ())
{
ReadIntegerArgument(value->GetScalar(),
clang_type.GetBitSize(&thread),
false,
thread,
argument_register_ids,
current_argument_register,
current_stack_argument);
}
}
return true;
}
bool
ABISysV_ppc::PrepareTrivialCall (Thread &thread,
addr_t sp,
addr_t func_addr,
addr_t return_addr,
llvm::ArrayRef<addr_t> args) const
{
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
if (log)
{
StreamString s;
s.Printf("ABISysV_ppc::PrepareTrivialCall (tid = 0x%" PRIx64 ", sp = 0x%" PRIx64 ", func_addr = 0x%" PRIx64 ", return_addr = 0x%" PRIx64,
thread.GetID(),
(uint64_t)sp,
(uint64_t)func_addr,
(uint64_t)return_addr);
for (size_t i = 0; i < args.size(); ++i)
s.Printf (", arg%zd = 0x%" PRIx64, i + 1, args[i]);
s.PutCString (")");
log->PutCString(s.GetString().c_str());
}
RegisterContext *reg_ctx = thread.GetRegisterContext().get();
if (!reg_ctx)
return false;
const RegisterInfo *reg_info = NULL;
if (args.size() > 8) // TODO handle more than 8 arguments
return false;
for (size_t i = 0; i < args.size(); ++i)
{
reg_info = reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1 + i);
if (log)
log->Printf("About to write arg%zd (0x%" PRIx64 ") into %s", i + 1, args[i], reg_info->name);
if (!reg_ctx->WriteRegisterFromUnsigned(reg_info, args[i]))
return false;
}
// First, align the SP
if (log)
log->Printf("16-byte aligning SP: 0x%" PRIx64 " to 0x%" PRIx64, (uint64_t)sp, (uint64_t)(sp & ~0xfull));
sp &= ~(0xfull); // 16-byte alignment
sp -= 8;
Error error;
const RegisterInfo *pc_reg_info = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
const RegisterInfo *sp_reg_info = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP);
ProcessSP process_sp (thread.GetProcess());
RegisterValue reg_value;
#if 0
// This code adds an extra frame so that we don't lose the function that we came from
// by pushing the PC and the FP and then writing the current FP to point to the FP value
// we just pushed. It is disabled for now until the stack backtracing code can be debugged.
// Save current PC
const RegisterInfo *fp_reg_info = reg_ctx->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FP);
if (reg_ctx->ReadRegister(pc_reg_info, reg_value))
{
if (log)
log->Printf("Pushing the current PC onto the stack: 0x%" PRIx64 ": 0x%" PRIx64, (uint64_t)sp, reg_value.GetAsUInt64());
if (!process_sp->WritePointerToMemory(sp, reg_value.GetAsUInt64(), error))
return false;
sp -= 8;
// Save current FP
if (reg_ctx->ReadRegister(fp_reg_info, reg_value))
{
if (log)
log->Printf("Pushing the current FP onto the stack: 0x%" PRIx64 ": 0x%" PRIx64, (uint64_t)sp, reg_value.GetAsUInt64());
if (!process_sp->WritePointerToMemory(sp, reg_value.GetAsUInt64(), error))
return false;
}
// Setup FP backchain
reg_value.SetUInt64 (sp);
if (log)
log->Printf("Writing FP: 0x%" PRIx64 " (for FP backchain)", reg_value.GetAsUInt64());
if (!reg_ctx->WriteRegister(fp_reg_info, reg_value))
{
return false;
}
sp -= 8;
}
#endif
if (log)
//.........这里部分代码省略.........
//----------------------------------------------------------------------
// ThreadPlanCallFunction: Plan to call a single function
//----------------------------------------------------------------------
bool
ThreadPlanCallFunction::ConstructorSetup (Thread &thread,
ABI *& abi,
lldb::addr_t &start_load_addr,
lldb::addr_t &function_load_addr)
{
SetIsMasterPlan (true);
SetOkayToDiscard (false);
SetPrivate (true);
ProcessSP process_sp (thread.GetProcess());
if (!process_sp)
return false;
abi = process_sp->GetABI().get();
if (!abi)
return false;
Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_STEP));
SetBreakpoints();
m_function_sp = thread.GetRegisterContext()->GetSP() - abi->GetRedZoneSize();
// If we can't read memory at the point of the process where we are planning to put our function, we're
// not going to get any further...
Error error;
process_sp->ReadUnsignedIntegerFromMemory(m_function_sp, 4, 0, error);
if (!error.Success())
{
m_constructor_errors.Printf ("Trying to put the stack in unreadable memory at: 0x%" PRIx64 ".", m_function_sp);
if (log)
log->Printf ("ThreadPlanCallFunction(%p): %s.",
static_cast<void*>(this),
m_constructor_errors.GetData());
return false;
}
Module *exe_module = GetTarget().GetExecutableModulePointer();
if (exe_module == NULL)
{
m_constructor_errors.Printf ("Can't execute code without an executable module.");
if (log)
log->Printf ("ThreadPlanCallFunction(%p): %s.",
static_cast<void*>(this),
m_constructor_errors.GetData());
return false;
}
else
{
ObjectFile *objectFile = exe_module->GetObjectFile();
if (!objectFile)
{
m_constructor_errors.Printf ("Could not find object file for module \"%s\".",
exe_module->GetFileSpec().GetFilename().AsCString());
if (log)
log->Printf ("ThreadPlanCallFunction(%p): %s.",
static_cast<void*>(this),
m_constructor_errors.GetData());
return false;
}
m_start_addr = objectFile->GetEntryPointAddress();
if (!m_start_addr.IsValid())
{
m_constructor_errors.Printf ("Could not find entry point address for executable module \"%s\".",
exe_module->GetFileSpec().GetFilename().AsCString());
if (log)
log->Printf ("ThreadPlanCallFunction(%p): %s.",
static_cast<void*>(this),
m_constructor_errors.GetData());
return false;
}
}
start_load_addr = m_start_addr.GetLoadAddress (&GetTarget());
// Checkpoint the thread state so we can restore it later.
if (log && log->GetVerbose())
ReportRegisterState ("About to checkpoint thread before function call. Original register state was:");
if (!thread.CheckpointThreadState (m_stored_thread_state))
{
m_constructor_errors.Printf ("Setting up ThreadPlanCallFunction, failed to checkpoint thread state.");
if (log)
log->Printf ("ThreadPlanCallFunction(%p): %s.",
static_cast<void*>(this),
m_constructor_errors.GetData());
return false;
}
function_load_addr = m_function_addr.GetLoadAddress (&GetTarget());
return true;
}
客服电话
APP下载
官方微信
请发表评论