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, 173 insertions, 0 deletions

diff --git a/lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_powerpc.h b/lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_powerpc.h
new file mode 100644
index 00000000000..3194c3968c9
--- /dev/null
+++ b/lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_powerpc.h
@@ -0,0 +1,173 @@
+//===-- RegisterContextPOSIX_powerpc.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_RegisterContextPOSIX_powerpc_H_
+#define liblldb_RegisterContextPOSIX_powerpc_H_
+
+#include "lldb/Core/Log.h"
+#include "RegisterContextPOSIX.h"
+#include "RegisterContext_powerpc.h"
+
+class ProcessMonitor;
+
+// ---------------------------------------------------------------------------
+// Internal codes for all powerpc registers.
+// ---------------------------------------------------------------------------
+enum
+{
+    k_first_gpr_powerpc,
+    gpr_r0_powerpc = k_first_gpr_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,
+    k_last_gpr_powerpc = gpr_pc_powerpc,
+
+    k_first_fpr,
+    fpr_f0_powerpc = k_first_fpr,
+    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,
+    k_last_fpr = fpr_fpscr_powerpc,
+
+    k_num_registers_powerpc,
+    k_num_gpr_registers_powerpc = k_last_gpr_powerpc - k_first_gpr_powerpc + 1,
+    k_num_fpr_registers_powerpc = k_last_fpr - k_first_fpr + 1,
+};
+
+class RegisterContextPOSIX_powerpc
+  : public lldb_private::RegisterContext
+{
+public:
+    RegisterContextPOSIX_powerpc (lldb_private::Thread &thread,
+                            uint32_t concrete_frame_idx,
+                            lldb_private::RegisterInfoInterface *register_info);
+
+    ~RegisterContextPOSIX_powerpc();
+
+    void
+    Invalidate();
+
+    void
+    InvalidateAllRegisters();
+
+    size_t
+    GetRegisterCount();
+
+    virtual size_t
+    GetGPRSize();
+
+    virtual unsigned
+    GetRegisterSize(unsigned reg);
+
+    virtual unsigned
+    GetRegisterOffset(unsigned reg);
+
+    const lldb_private::RegisterInfo *
+    GetRegisterInfoAtIndex(size_t reg);
+
+    size_t
+    GetRegisterSetCount();
+
+    const lldb_private::RegisterSet *
+    GetRegisterSet(size_t set);
+
+    const char *
+    GetRegisterName(unsigned reg);
+
+    uint32_t
+    ConvertRegisterKindToRegisterNumber(lldb::RegisterKind kind, uint32_t num);
+
+protected:
+    uint64_t m_gpr_powerpc[k_num_gpr_registers_powerpc];         // general purpose registers.
+    std::unique_ptr<lldb_private::RegisterInfoInterface> m_register_info_ap; // Register Info Interface (FreeBSD or Linux)
+
+    // Determines if an extended register set is supported on the processor running the inferior process.
+    virtual bool
+    IsRegisterSetAvailable(size_t set_index);
+
+    virtual const lldb_private::RegisterInfo *
+    GetRegisterInfo();
+
+    bool
+    IsGPR(unsigned reg);
+
+    bool
+    IsFPR(unsigned reg);
+
+    lldb::ByteOrder GetByteOrder();
+
+    virtual bool ReadGPR() = 0;
+    virtual bool ReadFPR() = 0;
+    virtual bool WriteGPR() = 0;
+    virtual bool WriteFPR() = 0;
+};
+
+#endif // #ifndef liblldb_RegisterContextPOSIX_powerpc_H_