First cut of PowerPC(64) support in LLDB.

Summary:
This adds preliminary support for PowerPC/PowerPC64, for FreeBSD.  There are
some issues still:

 * Breakpoints don't work well on powerpc64.
 * Shared libraries don't yet get loaded for a 32-bit process on powerpc64 host.
 * Backtraces don't work.  This is due to PowerPC ABI using a backchain pointer
   in memory, instead of a dedicated frame pointer register for the backchain.
 * Breakpoints on functions without debug info may not work correctly for 32-bit
   powerpc.

Reviewers: emaste, tfiala, jingham, clayborg

Reviewed By: clayborg

Subscribers: emaste, lldb-commits

Differential Revision: http://reviews.llvm.org/D5988

llvm-svn: 220944

1 files changed, 273 insertions, 0 deletions

diff --git a/lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_powerpc.cpp b/lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_powerpc.cpp
new file mode 100644
index 00000000000..a9477d58351
--- /dev/null
+++ b/lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_powerpc.cpp
@@ -0,0 +1,273 @@
+//===-- RegisterContextPOSIX_powerpc.cpp -------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <cstring>
+#include <errno.h>
+#include <stdint.h>
+
+#include "lldb/Core/DataBufferHeap.h"
+#include "lldb/Core/DataExtractor.h"
+#include "lldb/Core/RegisterValue.h"
+#include "lldb/Core/Scalar.h"
+#include "lldb/Target/Target.h"
+#include "lldb/Target/Thread.h"
+#include "lldb/Host/Endian.h"
+#include "llvm/Support/Compiler.h"
+
+#include "RegisterContextPOSIX_powerpc.h"
+#include "Plugins/Process/elf-core/ProcessElfCore.h"
+
+using namespace lldb_private;
+using namespace lldb;
+
+static const
+uint32_t g_gpr_regnums[] =
+{
+    gpr_r0_powerpc,
+    gpr_r1_powerpc,
+    gpr_r2_powerpc,
+    gpr_r3_powerpc,
+    gpr_r4_powerpc,
+    gpr_r5_powerpc,
+    gpr_r6_powerpc,
+    gpr_r7_powerpc,
+    gpr_r8_powerpc,
+    gpr_r9_powerpc,
+    gpr_r10_powerpc,
+    gpr_r11_powerpc,
+    gpr_r12_powerpc,
+    gpr_r13_powerpc,
+    gpr_r14_powerpc,
+    gpr_r15_powerpc,
+    gpr_r16_powerpc,
+    gpr_r17_powerpc,
+    gpr_r18_powerpc,
+    gpr_r19_powerpc,
+    gpr_r20_powerpc,
+    gpr_r21_powerpc,
+    gpr_r22_powerpc,
+    gpr_r23_powerpc,
+    gpr_r24_powerpc,
+    gpr_r25_powerpc,
+    gpr_r26_powerpc,
+    gpr_r27_powerpc,
+    gpr_r28_powerpc,
+    gpr_r29_powerpc,
+    gpr_r30_powerpc,
+    gpr_r31_powerpc,
+    gpr_lr_powerpc,
+    gpr_cr_powerpc,
+    gpr_xer_powerpc,
+    gpr_ctr_powerpc,
+    gpr_pc_powerpc,
+};
+
+static const
+uint32_t g_fpr_regnums[] =
+{
+    fpr_f0_powerpc,
+    fpr_f1_powerpc,
+    fpr_f2_powerpc,
+    fpr_f3_powerpc,
+    fpr_f4_powerpc,
+    fpr_f5_powerpc,
+    fpr_f6_powerpc,
+    fpr_f7_powerpc,
+    fpr_f8_powerpc,
+    fpr_f9_powerpc,
+    fpr_f10_powerpc,
+    fpr_f11_powerpc,
+    fpr_f12_powerpc,
+    fpr_f13_powerpc,
+    fpr_f14_powerpc,
+    fpr_f15_powerpc,
+    fpr_f16_powerpc,
+    fpr_f17_powerpc,
+    fpr_f18_powerpc,
+    fpr_f19_powerpc,
+    fpr_f20_powerpc,
+    fpr_f21_powerpc,
+    fpr_f22_powerpc,
+    fpr_f23_powerpc,
+    fpr_f24_powerpc,
+    fpr_f25_powerpc,
+    fpr_f26_powerpc,
+    fpr_f27_powerpc,
+    fpr_f28_powerpc,
+    fpr_f29_powerpc,
+    fpr_f30_powerpc,
+    fpr_f31_powerpc,
+    fpr_fpscr_powerpc,
+};
+
+// Number of register sets provided by this context.
+enum
+{
+    k_num_register_sets = 2
+};
+
+static const RegisterSet
+g_reg_sets_powerpc[k_num_register_sets] =
+{
+    { "General Purpose Registers",  "gpr", k_num_gpr_registers_powerpc, g_gpr_regnums },
+    { "Floating Point Registers",  "fpr", k_num_fpr_registers_powerpc, g_fpr_regnums },
+};
+
+bool RegisterContextPOSIX_powerpc::IsGPR(unsigned reg)
+{
+    return reg <= k_num_gpr_registers_powerpc;   // GPR's come first.
+}
+
+bool
+RegisterContextPOSIX_powerpc::IsFPR(unsigned reg)
+{
+    // XXX
+    return (reg >= k_first_fpr) && (reg <= k_last_fpr);
+}
+
+RegisterContextPOSIX_powerpc::RegisterContextPOSIX_powerpc(Thread &thread,
+                                               uint32_t concrete_frame_idx,
+                                               RegisterInfoInterface *register_info)
+    : RegisterContext(thread, concrete_frame_idx)
+{
+    m_register_info_ap.reset(register_info);
+
+    // elf-core yet to support ReadFPR()
+    ProcessSP base = CalculateProcess();
+    if (base.get()->GetPluginName() ==  ProcessElfCore::GetPluginNameStatic())
+        return;
+}
+
+RegisterContextPOSIX_powerpc::~RegisterContextPOSIX_powerpc()
+{
+}
+
+void
+RegisterContextPOSIX_powerpc::Invalidate()
+{
+}
+
+void
+RegisterContextPOSIX_powerpc::InvalidateAllRegisters()
+{
+}
+
+unsigned
+RegisterContextPOSIX_powerpc::GetRegisterOffset(unsigned reg)
+{
+    assert(reg < k_num_registers_powerpc && "Invalid register number.");
+    return GetRegisterInfo()[reg].byte_offset;
+}
+
+unsigned
+RegisterContextPOSIX_powerpc::GetRegisterSize(unsigned reg)
+{
+    assert(reg < k_num_registers_powerpc && "Invalid register number.");
+    return GetRegisterInfo()[reg].byte_size;
+}
+
+size_t
+RegisterContextPOSIX_powerpc::GetRegisterCount()
+{
+    size_t num_registers = k_num_registers_powerpc;
+    return num_registers;
+}
+
+size_t
+RegisterContextPOSIX_powerpc::GetGPRSize()
+{
+    return m_register_info_ap->GetGPRSize();
+}
+
+const RegisterInfo *
+RegisterContextPOSIX_powerpc::GetRegisterInfo()
+{
+    // Commonly, this method is overridden and g_register_infos is copied and specialized.
+    // So, use GetRegisterInfo() rather than g_register_infos in this scope.
+    return m_register_info_ap->GetRegisterInfo ();
+}
+
+const RegisterInfo *
+RegisterContextPOSIX_powerpc::GetRegisterInfoAtIndex(size_t reg)
+{
+    if (reg < k_num_registers_powerpc)
+        return &GetRegisterInfo()[reg];
+    else
+        return NULL;
+}
+
+size_t
+RegisterContextPOSIX_powerpc::GetRegisterSetCount()
+{
+    size_t sets = 0;
+    for (size_t set = 0; set < k_num_register_sets; ++set)
+    {
+        if (IsRegisterSetAvailable(set))
+            ++sets;
+    }
+
+    return sets;
+}
+
+const RegisterSet *
+RegisterContextPOSIX_powerpc::GetRegisterSet(size_t set)
+{
+    if (IsRegisterSetAvailable(set))
+        return &g_reg_sets_powerpc[set];
+    else
+        return NULL;
+}
+
+const char *
+RegisterContextPOSIX_powerpc::GetRegisterName(unsigned reg)
+{
+    assert(reg < k_num_registers_powerpc && "Invalid register offset.");
+    return GetRegisterInfo()[reg].name;
+}
+
+lldb::ByteOrder
+RegisterContextPOSIX_powerpc::GetByteOrder()
+{
+    // Get the target process whose privileged thread was used for the register read.
+    lldb::ByteOrder byte_order = eByteOrderInvalid;
+    Process *process = CalculateProcess().get();
+
+    if (process)
+        byte_order = process->GetByteOrder();
+    return byte_order;
+}
+
+bool
+RegisterContextPOSIX_powerpc::IsRegisterSetAvailable(size_t set_index)
+{
+    size_t num_sets = k_num_register_sets;
+
+    return (set_index < num_sets);
+}
+
+// Used when parsing DWARF and EH frame information and any other
+// object file sections that contain register numbers in them.
+uint32_t
+RegisterContextPOSIX_powerpc::ConvertRegisterKindToRegisterNumber(lldb::RegisterKind kind,
+                                                                 uint32_t num)
+{
+    const uint32_t num_regs = GetRegisterCount();
+
+    assert (kind < kNumRegisterKinds);
+    for (uint32_t reg_idx = 0; reg_idx < num_regs; ++reg_idx)
+    {
+        const RegisterInfo *reg_info = GetRegisterInfoAtIndex (reg_idx);
+
+        if (reg_info->kinds[kind] == num)
+            return reg_idx;
+    }
+
+    return LLDB_INVALID_REGNUM;
+}
+