Import LLDB as of upstream SVN r225923 (git 2b588ecd)vendor/lldb/lldb-r225923

This corresponds with the branchpoint for the 3.6 release.
A number of files not required for the FreeBSD build have been removed.

Sponsored by:	DARPA, AFRL

1 files changed, 1124 insertions, 0 deletions

diff --git a/source/Plugins/ABI/SysV-ppc64/ABISysV_ppc64.cpp b/source/Plugins/ABI/SysV-ppc64/ABISysV_ppc64.cpp
new file mode 100644
index 000000000000..46f1e1023f0a
--- /dev/null
+++ b/source/Plugins/ABI/SysV-ppc64/ABISysV_ppc64.cpp
@@ -0,0 +1,1124 @@
+//===-- ABISysV_ppc64.cpp --------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ABISysV_ppc64.h"
+
+#include "lldb/Core/ConstString.h"
+#include "lldb/Core/DataExtractor.h"
+#include "lldb/Core/Error.h"
+#include "lldb/Core/Log.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Core/PluginManager.h"
+#include "lldb/Core/RegisterValue.h"
+#include "lldb/Core/Value.h"
+#include "lldb/Core/ValueObjectConstResult.h"
+#include "lldb/Core/ValueObjectRegister.h"
+#include "lldb/Core/ValueObjectMemory.h"
+#include "lldb/Symbol/ClangASTContext.h"
+#include "lldb/Symbol/UnwindPlan.h"
+#include "lldb/Target/Target.h"
+#include "lldb/Target/Process.h"
+#include "lldb/Target/RegisterContext.h"
+#include "lldb/Target/StackFrame.h"
+#include "lldb/Target/Thread.h"
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/Triple.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+enum gcc_dwarf_regnums
+{
+    gcc_dwarf_r0 = 0,
+    gcc_dwarf_r1,
+    gcc_dwarf_r2,
+    gcc_dwarf_r3,
+    gcc_dwarf_r4,
+    gcc_dwarf_r5,
+    gcc_dwarf_r6,
+    gcc_dwarf_r7,
+    gcc_dwarf_r8,
+    gcc_dwarf_r9,
+    gcc_dwarf_r10,
+    gcc_dwarf_r11,
+    gcc_dwarf_r12,
+    gcc_dwarf_r13,
+    gcc_dwarf_r14,
+    gcc_dwarf_r15,
+    gcc_dwarf_r16,
+    gcc_dwarf_r17,
+    gcc_dwarf_r18,
+    gcc_dwarf_r19,
+    gcc_dwarf_r20,
+    gcc_dwarf_r21,
+    gcc_dwarf_r22,
+    gcc_dwarf_r23,
+    gcc_dwarf_r24,
+    gcc_dwarf_r25,
+    gcc_dwarf_r26,
+    gcc_dwarf_r27,
+    gcc_dwarf_r28,
+    gcc_dwarf_r29,
+    gcc_dwarf_r30,
+    gcc_dwarf_r31,
+    gcc_dwarf_f0,
+    gcc_dwarf_f1,
+    gcc_dwarf_f2,
+    gcc_dwarf_f3,
+    gcc_dwarf_f4,
+    gcc_dwarf_f5,
+    gcc_dwarf_f6,
+    gcc_dwarf_f7,
+    gcc_dwarf_f8,
+    gcc_dwarf_f9,
+    gcc_dwarf_f10,
+    gcc_dwarf_f11,
+    gcc_dwarf_f12,
+    gcc_dwarf_f13,
+    gcc_dwarf_f14,
+    gcc_dwarf_f15,
+    gcc_dwarf_f16,
+    gcc_dwarf_f17,
+    gcc_dwarf_f18,
+    gcc_dwarf_f19,
+    gcc_dwarf_f20,
+    gcc_dwarf_f21,
+    gcc_dwarf_f22,
+    gcc_dwarf_f23,
+    gcc_dwarf_f24,
+    gcc_dwarf_f25,
+    gcc_dwarf_f26,
+    gcc_dwarf_f27,
+    gcc_dwarf_f28,
+    gcc_dwarf_f29,
+    gcc_dwarf_f30,
+    gcc_dwarf_f31,
+    gcc_dwarf_cr,
+    gcc_dwarf_fpscr,
+    gcc_dwarf_xer = 101,
+    gcc_dwarf_lr = 108,
+    gcc_dwarf_ctr,
+    gcc_dwarf_pc,
+    gcc_dwarf_cfa,
+};
+
+enum gdb_regnums
+{
+    gdb_r0 = 0,
+    gdb_r1,
+    gdb_r2,
+    gdb_r3,
+    gdb_r4,
+    gdb_r5,
+    gdb_r6,
+    gdb_r7,
+    gdb_r8,
+    gdb_r9,
+    gdb_r10,
+    gdb_r11,
+    gdb_r12,
+    gdb_r13,
+    gdb_r14,
+    gdb_r15,
+    gdb_r16,
+    gdb_r17,
+    gdb_r18,
+    gdb_r19,
+    gdb_r20,
+    gdb_r21,
+    gdb_r22,
+    gdb_r23,
+    gdb_r24,
+    gdb_r25,
+    gdb_r26,
+    gdb_r27,
+    gdb_r28,
+    gdb_r29,
+    gdb_r30,
+    gdb_r31,
+    gdb_lr,
+    gdb_cr,
+    gdb_xer,
+    gdb_ctr,
+    gdb_pc,
+};
+
+
+// Note that the size and offset will be updated by platform-specific classes.
+#define DEFINE_GPR(reg, alt, kind1, kind2, kind3, kind4)           \
+    { #reg, alt, 8, 0, eEncodingUint, \
+      eFormatHex, { kind1, kind2, kind3, kind4}, NULL, NULL }
+static const RegisterInfo
+g_register_infos[] =
+{
+    // General purpose registers.                 GCC,                  DWARF,              Generic,                GDB
+    DEFINE_GPR(r0,       NULL,  gcc_dwarf_r0,    gcc_dwarf_r0,    LLDB_INVALID_REGNUM,    gdb_r0),
+    DEFINE_GPR(r1,       "sp",  gcc_dwarf_r1,    gcc_dwarf_r1,    LLDB_REGNUM_GENERIC_SP, gdb_r1),
+    DEFINE_GPR(r2,       NULL,  gcc_dwarf_r2,    gcc_dwarf_r2,    LLDB_INVALID_REGNUM,    gdb_r2),
+    DEFINE_GPR(r3,       "arg1",gcc_dwarf_r3,    gcc_dwarf_r3,    LLDB_REGNUM_GENERIC_ARG1, gdb_r3),
+    DEFINE_GPR(r4,       "arg2",gcc_dwarf_r4,    gcc_dwarf_r4,    LLDB_REGNUM_GENERIC_ARG2 ,gdb_r4),
+    DEFINE_GPR(r5,       "arg3",gcc_dwarf_r5,    gcc_dwarf_r5,    LLDB_REGNUM_GENERIC_ARG3, gdb_r5),
+    DEFINE_GPR(r6,       "arg4",gcc_dwarf_r6,    gcc_dwarf_r6,    LLDB_REGNUM_GENERIC_ARG4, gdb_r6),
+    DEFINE_GPR(r7,       "arg5",gcc_dwarf_r7,    gcc_dwarf_r7,    LLDB_REGNUM_GENERIC_ARG5, gdb_r7),
+    DEFINE_GPR(r8,       "arg6",gcc_dwarf_r8,    gcc_dwarf_r8,    LLDB_REGNUM_GENERIC_ARG6, gdb_r8),
+    DEFINE_GPR(r9,       "arg7",gcc_dwarf_r9,    gcc_dwarf_r9,    LLDB_REGNUM_GENERIC_ARG7, gdb_r9),
+    DEFINE_GPR(r10,      "arg8",gcc_dwarf_r10,   gcc_dwarf_r10,   LLDB_REGNUM_GENERIC_ARG8, gdb_r10),
+    DEFINE_GPR(r11,      NULL,  gcc_dwarf_r11,   gcc_dwarf_r11,   LLDB_INVALID_REGNUM,    gdb_r11),
+    DEFINE_GPR(r12,      NULL,  gcc_dwarf_r12,   gcc_dwarf_r12,   LLDB_INVALID_REGNUM,    gdb_r12),
+    DEFINE_GPR(r13,      NULL,  gcc_dwarf_r13,   gcc_dwarf_r13,   LLDB_INVALID_REGNUM,    gdb_r13),
+    DEFINE_GPR(r14,      NULL,  gcc_dwarf_r14,   gcc_dwarf_r14,   LLDB_INVALID_REGNUM,    gdb_r14),
+    DEFINE_GPR(r15,      NULL,  gcc_dwarf_r15,   gcc_dwarf_r15,   LLDB_INVALID_REGNUM,    gdb_r15),
+    DEFINE_GPR(r16,      NULL,  gcc_dwarf_r16,   gcc_dwarf_r16,   LLDB_INVALID_REGNUM,    gdb_r16),
+    DEFINE_GPR(r17,      NULL,  gcc_dwarf_r17,   gcc_dwarf_r17,   LLDB_INVALID_REGNUM,    gdb_r17),
+    DEFINE_GPR(r18,      NULL,  gcc_dwarf_r18,   gcc_dwarf_r18,   LLDB_INVALID_REGNUM,    gdb_r18),
+    DEFINE_GPR(r19,      NULL,  gcc_dwarf_r19,   gcc_dwarf_r19,   LLDB_INVALID_REGNUM,    gdb_r19),
+    DEFINE_GPR(r20,      NULL,  gcc_dwarf_r20,   gcc_dwarf_r20,   LLDB_INVALID_REGNUM,    gdb_r20),
+    DEFINE_GPR(r21,      NULL,  gcc_dwarf_r21,   gcc_dwarf_r21,   LLDB_INVALID_REGNUM,    gdb_r21),
+    DEFINE_GPR(r22,      NULL,  gcc_dwarf_r22,   gcc_dwarf_r22,   LLDB_INVALID_REGNUM,    gdb_r22),
+    DEFINE_GPR(r23,      NULL,  gcc_dwarf_r23,   gcc_dwarf_r23,   LLDB_INVALID_REGNUM,    gdb_r23),
+    DEFINE_GPR(r24,      NULL,  gcc_dwarf_r24,   gcc_dwarf_r24,   LLDB_INVALID_REGNUM,    gdb_r24),
+    DEFINE_GPR(r25,      NULL,  gcc_dwarf_r25,   gcc_dwarf_r25,   LLDB_INVALID_REGNUM,    gdb_r25),
+    DEFINE_GPR(r26,      NULL,  gcc_dwarf_r26,   gcc_dwarf_r26,   LLDB_INVALID_REGNUM,    gdb_r26),
+    DEFINE_GPR(r27,      NULL,  gcc_dwarf_r27,   gcc_dwarf_r27,   LLDB_INVALID_REGNUM,    gdb_r27),
+    DEFINE_GPR(r28,      NULL,  gcc_dwarf_r28,   gcc_dwarf_r28,   LLDB_INVALID_REGNUM,    gdb_r28),
+    DEFINE_GPR(r29,      NULL,  gcc_dwarf_r29,   gcc_dwarf_r29,   LLDB_INVALID_REGNUM,    gdb_r29),
+    DEFINE_GPR(r30,      NULL,  gcc_dwarf_r30,   gcc_dwarf_r30,   LLDB_INVALID_REGNUM,    gdb_r30),
+    DEFINE_GPR(r31,      NULL,  gcc_dwarf_r31,   gcc_dwarf_r31,   LLDB_INVALID_REGNUM,    gdb_r31),
+    DEFINE_GPR(lr,       "lr",  gcc_dwarf_lr,    gcc_dwarf_lr,    LLDB_REGNUM_GENERIC_RA, gdb_lr),
+    DEFINE_GPR(cr,       "cr",  gcc_dwarf_cr,    gcc_dwarf_cr,    LLDB_REGNUM_GENERIC_FLAGS, LLDB_INVALID_REGNUM),
+    DEFINE_GPR(xer,      "xer", gcc_dwarf_xer,   gcc_dwarf_xer,   LLDB_INVALID_REGNUM,    LLDB_INVALID_REGNUM),
+    DEFINE_GPR(ctr,      "ctr", gcc_dwarf_ctr,   gcc_dwarf_ctr,   LLDB_INVALID_REGNUM,    LLDB_INVALID_REGNUM),
+    DEFINE_GPR(pc,       "pc",  gcc_dwarf_pc,    gcc_dwarf_pc,    LLDB_REGNUM_GENERIC_PC, LLDB_INVALID_REGNUM),
+    { NULL, NULL, 8, 0, eEncodingUint, eFormatHex, { gcc_dwarf_cfa, gcc_dwarf_cfa, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM}, NULL, NULL},
+};
+
+static const uint32_t k_num_register_infos = llvm::array_lengthof(g_register_infos);
+
+const lldb_private::RegisterInfo *
+ABISysV_ppc64::GetRegisterInfoArray (uint32_t &count)
+{
+    count = k_num_register_infos;
+    return g_register_infos;
+}
+
+
+size_t
+ABISysV_ppc64::GetRedZoneSize () const
+{
+    return 224;
+}
+
+//------------------------------------------------------------------
+// Static Functions
+//------------------------------------------------------------------
+ABISP
+ABISysV_ppc64::CreateInstance (const ArchSpec &arch)
+{
+    static ABISP g_abi_sp;
+    if (arch.GetTriple().getArch() == llvm::Triple::ppc64)
+    {
+        if (!g_abi_sp)
+            g_abi_sp.reset (new ABISysV_ppc64);
+        return g_abi_sp;
+    }
+    return ABISP();
+}
+
+bool
+ABISysV_ppc64::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_ppc64::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)
+        log->Printf("Pushing the return address onto the stack: 0x%" PRIx64 ": 0x%" PRIx64, (uint64_t)sp, (uint64_t)return_addr);
+
+    // Save return address onto the stack
+    if (!process_sp->WritePointerToMemory(sp, return_addr, error))
+        return false;
+
+    // %r1 is set to the actual stack value.
+
+    if (log)
+        log->Printf("Writing SP: 0x%" PRIx64, (uint64_t)sp);
+
+    if (!reg_ctx->WriteRegisterFromUnsigned (sp_reg_info, sp))
+        return false;
+
+    // %pc is set to the address of the called function.
+
+    if (log)
+        log->Printf("Writing IP: 0x%" PRIx64, (uint64_t)func_addr);
+
+    if (!reg_ctx->WriteRegisterFromUnsigned (pc_reg_info, func_addr))
+        return false;
+
+    return true;
+}
+
+static bool ReadIntegerArgument(Scalar           &scalar,
+                                unsigned int     bit_width,
+                                bool             is_signed,
+                                Thread           &thread,
+                                uint32_t         *argument_register_ids,
+                                unsigned int     &current_argument_register,
+                                addr_t           &current_stack_argument)
+{
+    if (bit_width > 64)
+        return false; // Scalar can't hold large integer arguments
+
+    if (current_argument_register < 6)
+    {
+        scalar = thread.GetRegisterContext()->ReadRegisterAsUnsigned(argument_register_ids[current_argument_register], 0);
+        current_argument_register++;
+        if (is_signed)
+            scalar.SignExtend (bit_width);
+    }
+    else
+    {
+        uint32_t byte_size = (bit_width + (8-1))/8;
+        Error error;
+        if (thread.GetProcess()->ReadScalarIntegerFromMemory(current_stack_argument, byte_size, is_signed, scalar, error))
+        {
+            current_stack_argument += byte_size;
+            return true;
+        }
+        return false;
+    }
+    return true;
+}
+
+bool
+ABISysV_ppc64::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(),
+                                is_signed,
+                                thread,
+                                argument_register_ids,
+                                current_argument_register,
+                                current_stack_argument);
+        }
+        else if (clang_type.IsPointerType ())
+        {
+            ReadIntegerArgument(value->GetScalar(),
+                                clang_type.GetBitSize(),
+                                false,
+                                thread,
+                                argument_register_ids,
+                                current_argument_register,
+                                current_stack_argument);
+        }
+    }
+
+    return true;
+}
+
+Error
+ABISysV_ppc64::SetReturnValueObject(lldb::StackFrameSP &frame_sp, lldb::ValueObjectSP &new_value_sp)
+{
+    Error error;
+    if (!new_value_sp)
+    {
+        error.SetErrorString("Empty value object for return value.");
+        return error;
+    }
+
+    ClangASTType clang_type = new_value_sp->GetClangType();
+    if (!clang_type)
+    {
+        error.SetErrorString ("Null clang type for return value.");
+        return error;
+    }
+
+    Thread *thread = frame_sp->GetThread().get();
+
+    bool is_signed;
+    uint32_t count;
+    bool is_complex;
+
+    RegisterContext *reg_ctx = thread->GetRegisterContext().get();
+
+    bool set_it_simple = false;
+    if (clang_type.IsIntegerType (is_signed) || clang_type.IsPointerType())
+    {
+        const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoByName("r3", 0);
+
+        DataExtractor data;
+        Error data_error;
+        size_t num_bytes = new_value_sp->GetData(data, data_error);
+        if (data_error.Fail())
+        {
+            error.SetErrorStringWithFormat("Couldn't convert return value to raw data: %s", data_error.AsCString());
+            return error;
+        }
+        lldb::offset_t offset = 0;
+        if (num_bytes <= 8)
+        {
+            uint64_t raw_value = data.GetMaxU64(&offset, num_bytes);
+
+            if (reg_ctx->WriteRegisterFromUnsigned (reg_info, raw_value))
+                set_it_simple = true;
+        }
+        else
+        {
+            error.SetErrorString("We don't support returning longer than 64 bit integer values at present.");
+        }
+
+    }
+    else if (clang_type.IsFloatingPointType (count, is_complex))
+    {
+        if (is_complex)
+            error.SetErrorString ("We don't support returning complex values at present");
+        else
+        {
+            size_t bit_width = clang_type.GetBitSize();
+            if (bit_width <= 64)
+            {
+                DataExtractor data;
+                Error data_error;
+                size_t num_bytes = new_value_sp->GetData(data, data_error);
+                if (data_error.Fail())
+                {
+                    error.SetErrorStringWithFormat("Couldn't convert return value to raw data: %s", data_error.AsCString());
+                    return error;
+                }
+
+                unsigned char buffer[16];
+                ByteOrder byte_order = data.GetByteOrder();
+
+                data.CopyByteOrderedData (0, num_bytes, buffer, 16, byte_order);
+                set_it_simple = true;
+            }
+            else
+            {
+                // FIXME - don't know how to do 80 bit long doubles yet.
+                error.SetErrorString ("We don't support returning float values > 64 bits at present");
+            }
+        }
+    }
+
+    if (!set_it_simple)
+    {
+        // Okay we've got a structure or something that doesn't fit in a simple register.
+        // We should figure out where it really goes, but we don't support this yet.
+        error.SetErrorString ("We only support setting simple integer and float return types at present.");
+    }
+
+    return error;
+}
+
+
+ValueObjectSP
+ABISysV_ppc64::GetReturnValueObjectSimple (Thread &thread,
+                                            ClangASTType &return_clang_type) const
+{
+    ValueObjectSP return_valobj_sp;
+    Value value;
+
+    if (!return_clang_type)
+        return return_valobj_sp;
+
+    //value.SetContext (Value::eContextTypeClangType, return_value_type);
+    value.SetClangType (return_clang_type);
+
+    RegisterContext *reg_ctx = thread.GetRegisterContext().get();
+    if (!reg_ctx)
+        return return_valobj_sp;
+
+    const uint32_t type_flags = return_clang_type.GetTypeInfo ();
+    if (type_flags & eTypeIsScalar)
+    {
+        value.SetValueType(Value::eValueTypeScalar);
+
+        bool success = false;
+        if (type_flags & eTypeIsInteger)
+        {
+            // Extract the register context so we can read arguments from registers
+
+            const size_t byte_size = return_clang_type.GetByteSize();
+            uint64_t raw_value = thread.GetRegisterContext()->ReadRegisterAsUnsigned(reg_ctx->GetRegisterInfoByName("r3", 0), 0);
+            const bool is_signed = (type_flags & eTypeIsSigned) != 0;
+            switch (byte_size)
+            {
+            default:
+                break;
+
+            case sizeof(uint64_t):
+                if (is_signed)
+                    value.GetScalar() = (int64_t)(raw_value);
+                else
+                    value.GetScalar() = (uint64_t)(raw_value);
+                success = true;
+                break;
+
+            case sizeof(uint32_t):
+                if (is_signed)
+                    value.GetScalar() = (int32_t)(raw_value & UINT32_MAX);
+                else
+                    value.GetScalar() = (uint32_t)(raw_value & UINT32_MAX);
+                success = true;
+                break;
+
+            case sizeof(uint16_t):
+                if (is_signed)
+                    value.GetScalar() = (int16_t)(raw_value & UINT16_MAX);
+                else
+                    value.GetScalar() = (uint16_t)(raw_value & UINT16_MAX);
+                success = true;
+                break;
+
+            case sizeof(uint8_t):
+                if (is_signed)
+                    value.GetScalar() = (int8_t)(raw_value & UINT8_MAX);
+                else
+                    value.GetScalar() = (uint8_t)(raw_value & UINT8_MAX);
+                success = true;
+                break;
+            }
+        }
+        else if (type_flags & eTypeIsFloat)
+        {
+            if (type_flags & eTypeIsComplex)
+            {
+                // Don't handle complex yet.
+            }
+            else
+            {
+                const size_t byte_size = return_clang_type.GetByteSize();
+                if (byte_size <= sizeof(long double))
+                {
+                    const RegisterInfo *f1_info = reg_ctx->GetRegisterInfoByName("f1", 0);
+                    RegisterValue f1_value;
+                    if (reg_ctx->ReadRegister (f1_info, f1_value))
+                    {
+                        DataExtractor data;
+                        if (f1_value.GetData(data))
+                        {
+                            lldb::offset_t offset = 0;
+                            if (byte_size == sizeof(float))
+                            {
+                                value.GetScalar() = (float) data.GetFloat(&offset);
+                                success = true;
+                            }
+                            else if (byte_size == sizeof(double))
+                            {
+                                value.GetScalar() = (double) data.GetDouble(&offset);
+                                success = true;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        if (success)
+            return_valobj_sp = ValueObjectConstResult::Create (thread.GetStackFrameAtIndex(0).get(),
+                                                               value,
+                                                               ConstString(""));
+
+    }
+    else if (type_flags & eTypeIsPointer)
+    {
+        unsigned r3_id = reg_ctx->GetRegisterInfoByName("r3", 0)->kinds[eRegisterKindLLDB];
+        value.GetScalar() = (uint64_t)thread.GetRegisterContext()->ReadRegisterAsUnsigned(r3_id, 0);
+        value.SetValueType(Value::eValueTypeScalar);
+        return_valobj_sp = ValueObjectConstResult::Create (thread.GetStackFrameAtIndex(0).get(),
+                                                           value,
+                                                           ConstString(""));
+    }
+    else if (type_flags & eTypeIsVector)
+    {
+        const size_t byte_size = return_clang_type.GetByteSize();
+        if (byte_size > 0)
+        {
+
+            const RegisterInfo *altivec_reg = reg_ctx->GetRegisterInfoByName("v0", 0);
+            if (altivec_reg == NULL)
+                altivec_reg = reg_ctx->GetRegisterInfoByName("mm0", 0);
+            if (altivec_reg)
+            {
+                if (byte_size <= altivec_reg->byte_size)
+                {
+                    ProcessSP process_sp (thread.GetProcess());
+                    if (process_sp)
+                    {
+                        std::unique_ptr<DataBufferHeap> heap_data_ap (new DataBufferHeap(byte_size, 0));
+                        const ByteOrder byte_order = process_sp->GetByteOrder();
+                        RegisterValue reg_value;
+                        if (reg_ctx->ReadRegister(altivec_reg, reg_value))
+                        {
+                            Error error;
+                            if (reg_value.GetAsMemoryData (altivec_reg,
+                                                           heap_data_ap->GetBytes(),
+                                                           heap_data_ap->GetByteSize(),
+                                                           byte_order,
+                                                           error))
+                            {
+                                DataExtractor data (DataBufferSP (heap_data_ap.release()),
+                                                    byte_order,
+                                                    process_sp->GetTarget().GetArchitecture().GetAddressByteSize());
+                                return_valobj_sp = ValueObjectConstResult::Create (&thread,
+                                                                                   return_clang_type,
+                                                                                   ConstString(""),
+                                                                                   data);
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    return return_valobj_sp;
+}
+
+ValueObjectSP
+ABISysV_ppc64::GetReturnValueObjectImpl (Thread &thread, ClangASTType &return_clang_type) const
+{
+    ValueObjectSP return_valobj_sp;
+
+    if (!return_clang_type)
+        return return_valobj_sp;
+
+    ExecutionContext exe_ctx (thread.shared_from_this());
+    return_valobj_sp = GetReturnValueObjectSimple(thread, return_clang_type);
+    if (return_valobj_sp)
+        return return_valobj_sp;
+
+    RegisterContextSP reg_ctx_sp = thread.GetRegisterContext();
+    if (!reg_ctx_sp)
+        return return_valobj_sp;
+
+    const size_t bit_width = return_clang_type.GetBitSize();
+    if (return_clang_type.IsAggregateType())
+    {
+        Target *target = exe_ctx.GetTargetPtr();
+        bool is_memory = true;
+        if (bit_width <= 128)
+        {
+            ByteOrder target_byte_order = target->GetArchitecture().GetByteOrder();
+            DataBufferSP data_sp (new DataBufferHeap(16, 0));
+            DataExtractor return_ext (data_sp,
+                                      target_byte_order,
+                                      target->GetArchitecture().GetAddressByteSize());
+
+            const RegisterInfo *r3_info = reg_ctx_sp->GetRegisterInfoByName("r3", 0);
+            const RegisterInfo *rdx_info = reg_ctx_sp->GetRegisterInfoByName("rdx", 0);
+
+            RegisterValue r3_value, rdx_value;
+            reg_ctx_sp->ReadRegister (r3_info, r3_value);
+            reg_ctx_sp->ReadRegister (rdx_info, rdx_value);
+
+            DataExtractor r3_data, rdx_data;
+
+            r3_value.GetData(r3_data);
+            rdx_value.GetData(rdx_data);
+
+            uint32_t fp_bytes = 0;       // Tracks how much of the xmm registers we've consumed so far
+            uint32_t integer_bytes = 0;  // Tracks how much of the r3/rds registers we've consumed so far
+
+            const uint32_t num_children = return_clang_type.GetNumFields ();
+
+            // Since we are in the small struct regime, assume we are not in memory.
+            is_memory = false;
+
+            for (uint32_t idx = 0; idx < num_children; idx++)
+            {
+                std::string name;
+                uint64_t field_bit_offset = 0;
+                bool is_signed;
+                bool is_complex;
+                uint32_t count;
+
+                ClangASTType field_clang_type = return_clang_type.GetFieldAtIndex (idx, name, &field_bit_offset, NULL, NULL);
+                const size_t field_bit_width = field_clang_type.GetBitSize();
+
+                // If there are any unaligned fields, this is stored in memory.
+                if (field_bit_offset % field_bit_width != 0)
+                {
+                    is_memory = true;
+                    break;
+                }
+
+                uint32_t field_byte_width = field_bit_width/8;
+                uint32_t field_byte_offset = field_bit_offset/8;
+
+
+                DataExtractor *copy_from_extractor = NULL;
+                uint32_t       copy_from_offset    = 0;
+
+                if (field_clang_type.IsIntegerType (is_signed) || field_clang_type.IsPointerType ())
+                {
+                    if (integer_bytes < 8)
+                    {
+                        if (integer_bytes + field_byte_width <= 8)
+                        {
+                            // This is in RAX, copy from register to our result structure:
+                            copy_from_extractor = &r3_data;
+                            copy_from_offset = integer_bytes;
+                            integer_bytes += field_byte_width;
+                        }
+                        else
+                        {
+                            // The next field wouldn't fit in the remaining space, so we pushed it to rdx.
+                            copy_from_extractor = &rdx_data;
+                            copy_from_offset = 0;
+                            integer_bytes = 8 + field_byte_width;
+
+                        }
+                    }
+                    else if (integer_bytes + field_byte_width <= 16)
+                    {
+                        copy_from_extractor = &rdx_data;
+                        copy_from_offset = integer_bytes - 8;
+                        integer_bytes += field_byte_width;
+                    }
+                    else
+                    {
+                        // The last field didn't fit.  I can't see how that would happen w/o the overall size being
+                        // greater than 16 bytes.  For now, return a NULL return value object.
+                        return return_valobj_sp;
+                    }
+                }
+                else if (field_clang_type.IsFloatingPointType (count, is_complex))
+                {
+                    // Structs with long doubles are always passed in memory.
+                    if (field_bit_width == 128)
+                    {
+                        is_memory = true;
+                        break;
+                    }
+                    else if (field_bit_width == 64)
+                    {
+                        copy_from_offset = 0;
+                        fp_bytes += field_byte_width;
+                    }
+                    else if (field_bit_width == 32)
+                    {
+                        // This one is kind of complicated.  If we are in an "eightbyte" with another float, we'll
+                        // be stuffed into an xmm register with it.  If we are in an "eightbyte" with one or more ints,
+                        // then we will be stuffed into the appropriate GPR with them.
+                        bool in_gpr;
+                        if (field_byte_offset % 8 == 0)
+                        {
+                            // We are at the beginning of one of the eightbytes, so check the next element (if any)
+                            if (idx == num_children - 1)
+                                in_gpr = false;
+                            else
+                            {
+                                uint64_t next_field_bit_offset = 0;
+                                ClangASTType next_field_clang_type = return_clang_type.GetFieldAtIndex (idx + 1,
+                                                                                                        name,
+                                                                                                        &next_field_bit_offset,
+                                                                                                        NULL,
+                                                                                                        NULL);
+                                if (next_field_clang_type.IsIntegerType (is_signed))
+                                    in_gpr = true;
+                                else
+                                {
+                                    copy_from_offset = 0;
+                                    in_gpr = false;
+                                }
+                            }
+
+                        }
+                        else if (field_byte_offset % 4 == 0)
+                        {
+                            // We are inside of an eightbyte, so see if the field before us is floating point:
+                            // This could happen if somebody put padding in the structure.
+                            if (idx == 0)
+                                in_gpr = false;
+                            else
+                            {
+                                uint64_t prev_field_bit_offset = 0;
+                                ClangASTType prev_field_clang_type = return_clang_type.GetFieldAtIndex (idx - 1,
+                                                                                                        name,
+                                                                                                        &prev_field_bit_offset,
+                                                                                                        NULL,
+                                                                                                        NULL);
+                                if (prev_field_clang_type.IsIntegerType (is_signed))
+                                    in_gpr = true;
+                                else
+                                {
+                                    copy_from_offset = 4;
+                                    in_gpr = false;
+                                }
+                            }
+
+                        }
+                        else
+                        {
+                            is_memory = true;
+                            continue;
+                        }
+
+                        // Okay, we've figured out whether we are in GPR or XMM, now figure out which one.
+                        if (in_gpr)
+                        {
+                            if (integer_bytes < 8)
+                            {
+                                // This is in RAX, copy from register to our result structure:
+                                copy_from_extractor = &r3_data;
+                                copy_from_offset = integer_bytes;
+                                integer_bytes += field_byte_width;
+                            }
+                            else
+                            {
+                                copy_from_extractor = &rdx_data;
+                                copy_from_offset = integer_bytes - 8;
+                                integer_bytes += field_byte_width;
+                            }
+                        }
+                        else
+                        {
+                            fp_bytes += field_byte_width;
+                        }
+                    }
+                }
+
+                // These two tests are just sanity checks.  If I somehow get the
+                // type calculation wrong above it is better to just return nothing
+                // than to assert or crash.
+                if (!copy_from_extractor)
+                    return return_valobj_sp;
+                if (copy_from_offset + field_byte_width > copy_from_extractor->GetByteSize())
+                    return return_valobj_sp;
+
+                copy_from_extractor->CopyByteOrderedData (copy_from_offset,
+                                                          field_byte_width,
+                                                          data_sp->GetBytes() + field_byte_offset,
+                                                          field_byte_width,
+                                                          target_byte_order);
+            }
+
+            if (!is_memory)
+            {
+                // The result is in our data buffer.  Let's make a variable object out of it:
+                return_valobj_sp = ValueObjectConstResult::Create (&thread,
+                                                                   return_clang_type,
+                                                                   ConstString(""),
+                                                                   return_ext);
+            }
+        }
+
+
+        // FIXME: This is just taking a guess, r3 may very well no longer hold the return storage location.
+        // If we are going to do this right, when we make a new frame we should check to see if it uses a memory
+        // return, and if we are at the first instruction and if so stash away the return location.  Then we would
+        // only return the memory return value if we know it is valid.
+
+        if (is_memory)
+        {
+            unsigned r3_id = reg_ctx_sp->GetRegisterInfoByName("r3", 0)->kinds[eRegisterKindLLDB];
+            lldb::addr_t storage_addr = (uint64_t)thread.GetRegisterContext()->ReadRegisterAsUnsigned(r3_id, 0);
+            return_valobj_sp = ValueObjectMemory::Create (&thread,
+                                                          "",
+                                                          Address (storage_addr, NULL),
+                                                          return_clang_type);
+        }
+    }
+
+    return return_valobj_sp;
+}
+
+bool
+ABISysV_ppc64::CreateFunctionEntryUnwindPlan (UnwindPlan &unwind_plan)
+{
+    unwind_plan.Clear();
+    unwind_plan.SetRegisterKind (eRegisterKindDWARF);
+
+    uint32_t lr_reg_num = gcc_dwarf_lr;
+    uint32_t sp_reg_num = gcc_dwarf_r1;
+    uint32_t pc_reg_num = gcc_dwarf_pc;
+
+    UnwindPlan::RowSP row(new UnwindPlan::Row);
+
+    // Our Call Frame Address is the stack pointer value
+    row->SetCFARegister (sp_reg_num);
+
+    // The previous PC is in the LR
+    row->SetRegisterLocationToRegister(pc_reg_num, lr_reg_num, true);
+    unwind_plan.AppendRow (row);
+
+    // All other registers are the same.
+
+    unwind_plan.SetSourceName ("ppc64 at-func-entry default");
+    unwind_plan.SetSourcedFromCompiler (eLazyBoolNo);
+
+    return true;
+}
+
+bool
+ABISysV_ppc64::CreateDefaultUnwindPlan (UnwindPlan &unwind_plan)
+{
+    unwind_plan.Clear();
+    unwind_plan.SetRegisterKind (eRegisterKindDWARF);
+
+    uint32_t sp_reg_num = gcc_dwarf_r1;
+    uint32_t pc_reg_num = gcc_dwarf_lr;
+
+    UnwindPlan::RowSP row(new UnwindPlan::Row);
+
+    const int32_t ptr_size = 8;
+    row->SetCFARegister (sp_reg_num);
+    row->SetCFAType(lldb_private::UnwindPlan::Row::CFAIsRegisterDereferenced);
+
+    row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * 2, true);
+    row->SetRegisterLocationToIsCFAPlusOffset(sp_reg_num, 0, true);
+    row->SetRegisterLocationToAtCFAPlusOffset(gcc_dwarf_cr, ptr_size, true);
+
+    unwind_plan.AppendRow (row);
+    unwind_plan.SetSourceName ("ppc64 default unwind plan");
+    unwind_plan.SetSourcedFromCompiler (eLazyBoolNo);
+    unwind_plan.SetUnwindPlanValidAtAllInstructions (eLazyBoolNo);
+    unwind_plan.SetReturnAddressRegister(gcc_dwarf_lr);
+    return true;
+}
+
+bool
+ABISysV_ppc64::RegisterIsVolatile (const RegisterInfo *reg_info)
+{
+    return !RegisterIsCalleeSaved (reg_info);
+}
+
+
+
+// See "Register Usage" in the
+// "System V Application Binary Interface"
+// "64-bit PowerPC ELF Application Binary Interface Supplement"
+// current version is 1.9 released 2004 at http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.pdf
+
+bool
+ABISysV_ppc64::RegisterIsCalleeSaved (const RegisterInfo *reg_info)
+{
+    if (reg_info)
+    {
+        // Preserved registers are :
+        //    r1,r2,r13-r31
+        //    cr2-cr4 (partially preserved)
+        //    f14-f31 (not yet)
+        //    v20-v31 (not yet)
+        //    vrsave (not yet)
+
+        const char *name = reg_info->name;
+        if (name[0] == 'r')
+        {
+            if ((name[1] == '1' || name[1] == '2') && name[2] == '\0')
+                return true;
+            if (name[1] == '1' && name[2] > '2')
+                return true;
+            if ((name[1] == '2' || name[1] == '3') && name[2] != '\0')
+                return true;
+        }
+
+        if (name[0] == 'f' && name[1] >= '0' && name[2] <= '9')
+        {
+            if (name[2] == '\0')
+                return false;
+            if (name[1] == '1' && name[2] >= '4')
+                return true;
+            if ((name[1] == '2' || name[1] == '3') && name[2] != '\0')
+                return true;
+        }
+
+        if (name[0] == 's' && name[1] == 'p' && name[2] == '\0')   // sp
+            return true;
+        if (name[0] == 'f' && name[1] == 'p' && name[2] == '\0')   // fp
+            return true;
+        if (name[0] == 'p' && name[1] == 'c' && name[2] == '\0')   // pc
+            return true;
+    }
+    return false;
+}
+
+
+
+void
+ABISysV_ppc64::Initialize()
+{
+    PluginManager::RegisterPlugin (GetPluginNameStatic(),
+                                   "System V ABI for ppc64 targets",
+                                   CreateInstance);
+}
+
+void
+ABISysV_ppc64::Terminate()
+{
+    PluginManager::UnregisterPlugin (CreateInstance);
+}
+
+lldb_private::ConstString
+ABISysV_ppc64::GetPluginNameStatic()
+{
+    static ConstString g_name("sysv-ppc64");
+    return g_name;
+}
+
+//------------------------------------------------------------------
+// PluginInterface protocol
+//------------------------------------------------------------------
+lldb_private::ConstString
+ABISysV_ppc64::GetPluginName()
+{
+    return GetPluginNameStatic();
+}
+
+uint32_t
+ABISysV_ppc64::GetPluginVersion()
+{
+    return 1;
+}
+