// -*- mode: c++ -*-

// Copyright (c) 2010 Google Inc.
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
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// in the documentation and/or other materials provided with the
// distribution.
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// stack_frame_cpu.h: CPU-specific StackFrame extensions.
//
// These types extend the StackFrame structure to carry CPU-specific register
// state.  They are defined in this header instead of stack_frame.h to
// avoid the need to include minidump_format.h when only the generic
// StackFrame type is needed.
//
// Author: Mark Mentovai

#ifndef GOOGLE_BREAKPAD_PROCESSOR_STACK_FRAME_CPU_H__
#define GOOGLE_BREAKPAD_PROCESSOR_STACK_FRAME_CPU_H__

#include "google_breakpad/common/minidump_format.h"
#include "google_breakpad/processor/stack_frame.h"

namespace google_breakpad {

struct WindowsFrameInfo;
class CFIFrameInfo;

struct StackFrameX86 : public StackFrame {
  // ContextValidity has one entry for each relevant hardware pointer
  // register (%eip and %esp) and one entry for each general-purpose
  // register. It's worthwhile having validity flags for caller-saves
  // registers: they are valid in the youngest frame, and such a frame
  // might save a callee-saves register in a caller-saves register, but
  // SimpleCFIWalker won't touch registers unless they're marked as valid.
  enum ContextValidity {
    CONTEXT_VALID_NONE = 0,
    CONTEXT_VALID_EIP  = 1 << 0,
    CONTEXT_VALID_ESP  = 1 << 1,
    CONTEXT_VALID_EBP  = 1 << 2,
    CONTEXT_VALID_EAX  = 1 << 3,
    CONTEXT_VALID_EBX  = 1 << 4,
    CONTEXT_VALID_ECX  = 1 << 5,
    CONTEXT_VALID_EDX  = 1 << 6,
    CONTEXT_VALID_ESI  = 1 << 7,
    CONTEXT_VALID_EDI  = 1 << 8,
    CONTEXT_VALID_ALL  = -1
  };

  StackFrameX86()
     : context(),
       context_validity(CONTEXT_VALID_NONE),
       windows_frame_info(NULL),
       cfi_frame_info(NULL) {}
  ~StackFrameX86();

  // Overriden to return the return address as saved on the stack.
  virtual uint64_t ReturnAddress() const;

  // Register state.  This is only fully valid for the topmost frame in a
  // stack.  In other frames, the values of nonvolatile registers may be
  // present, given sufficient debugging information.  Refer to
  // context_validity.
  MDRawContextX86 context;

  // context_validity is actually ContextValidity, but int is used because
  // the OR operator doesn't work well with enumerated types.  This indicates
  // which fields in context are valid.
  int context_validity;

  // Any stack walking information we found describing this.instruction.
  // These may be NULL if there is no such information for that address.
  WindowsFrameInfo *windows_frame_info;
  CFIFrameInfo *cfi_frame_info;
};

struct StackFramePPC : public StackFrame {
  // ContextValidity should eventually contain entries for the validity of
  // other nonvolatile (callee-save) registers as in
  // StackFrameX86::ContextValidity, but the ppc stackwalker doesn't currently
  // locate registers other than the ones listed here.
  enum ContextValidity {
    CONTEXT_VALID_NONE = 0,
    CONTEXT_VALID_SRR0 = 1 << 0,
    CONTEXT_VALID_GPR1 = 1 << 1,
    CONTEXT_VALID_ALL  = -1
  };

  StackFramePPC() : context(), context_validity(CONTEXT_VALID_NONE) {}

  // Register state.  This is only fully valid for the topmost frame in a
  // stack.  In other frames, the values of nonvolatile registers may be
  // present, given sufficient debugging information.  Refer to
  // context_validity.
  MDRawContextPPC context;

  // context_validity is actually ContextValidity, but int is used because
  // the OR operator doesn't work well with enumerated types.  This indicates
  // which fields in context are valid.
  int context_validity;
};

struct StackFramePPC64 : public StackFrame {
  // ContextValidity should eventually contain entries for the validity of
  // other nonvolatile (callee-save) registers as in
  // StackFrameX86::ContextValidity, but the ppc stackwalker doesn't currently
  // locate registers other than the ones listed here.
  enum ContextValidity {
    CONTEXT_VALID_NONE = 0,
    CONTEXT_VALID_SRR0 = 1 << 0,
    CONTEXT_VALID_GPR1 = 1 << 1,
    CONTEXT_VALID_ALL  = -1
  };

  StackFramePPC64() : context(), context_validity(CONTEXT_VALID_NONE) {}

  // Register state.  This is only fully valid for the topmost frame in a
  // stack.  In other frames, the values of nonvolatile registers may be
  // present, given sufficient debugging information.  Refer to
  // context_validity.
  MDRawContextPPC64 context;

  // context_validity is actually ContextValidity, but int is used because
  // the OR operator doesn't work well with enumerated types.  This indicates
  // which fields in context are valid.
  int context_validity;
};

struct StackFrameAMD64 : public StackFrame {
  // ContextValidity has one entry for each register that we might be able
  // to recover.
  enum ContextValidity {
    CONTEXT_VALID_NONE  = 0,
    CONTEXT_VALID_RAX   = 1 << 0,
    CONTEXT_VALID_RDX   = 1 << 1,
    CONTEXT_VALID_RCX   = 1 << 2,
    CONTEXT_VALID_RBX   = 1 << 3,
    CONTEXT_VALID_RSI   = 1 << 4,
    CONTEXT_VALID_RDI   = 1 << 5,
    CONTEXT_VALID_RBP   = 1 << 6,
    CONTEXT_VALID_RSP   = 1 << 7,
    CONTEXT_VALID_R8    = 1 << 8,
    CONTEXT_VALID_R9    = 1 << 9,
    CONTEXT_VALID_R10   = 1 << 10,
    CONTEXT_VALID_R11   = 1 << 11,
    CONTEXT_VALID_R12   = 1 << 12,
    CONTEXT_VALID_R13   = 1 << 13,
    CONTEXT_VALID_R14   = 1 << 14,
    CONTEXT_VALID_R15   = 1 << 15,
    CONTEXT_VALID_RIP   = 1 << 16,
    CONTEXT_VALID_ALL  = -1
  };

  StackFrameAMD64() : context(), context_validity(CONTEXT_VALID_NONE) {}

  // Overriden to return the return address as saved on the stack.
  virtual uint64_t ReturnAddress() const;

  // Register state. This is only fully valid for the topmost frame in a
  // stack. In other frames, which registers are present depends on what
  // debugging information we had available. Refer to context_validity.
  MDRawContextAMD64 context;

  // For each register in context whose value has been recovered, we set
  // the corresponding CONTEXT_VALID_ bit in context_validity.
  //
  // context_validity's type should actually be ContextValidity, but
  // we use int instead because the bitwise inclusive or operator
  // yields an int when applied to enum values, and C++ doesn't
  // silently convert from ints to enums.
  int context_validity;
};

struct StackFrameSPARC : public StackFrame {
  // to be confirmed
  enum ContextValidity {
    CONTEXT_VALID_NONE = 0,
    CONTEXT_VALID_PC   = 1 << 0,
    CONTEXT_VALID_SP   = 1 << 1,
    CONTEXT_VALID_FP   = 1 << 2,
    CONTEXT_VALID_ALL  = -1
  };

  StackFrameSPARC() : context(), context_validity(CONTEXT_VALID_NONE) {}

  // Register state.  This is only fully valid for the topmost frame in a
  // stack.  In other frames, the values of nonvolatile registers may be
  // present, given sufficient debugging information.  Refer to
  // context_validity.
  MDRawContextSPARC context;

  // context_validity is actually ContextValidity, but int is used because
  // the OR operator doesn't work well with enumerated types.  This indicates
  // which fields in context are valid.
  int context_validity;
};

struct StackFrameARM : public StackFrame {
  // A flag for each register we might know.
  enum ContextValidity {
    CONTEXT_VALID_NONE = 0,
    CONTEXT_VALID_R0   = 1 << 0,
    CONTEXT_VALID_R1   = 1 << 1,
    CONTEXT_VALID_R2   = 1 << 2,
    CONTEXT_VALID_R3   = 1 << 3,
    CONTEXT_VALID_R4   = 1 << 4,
    CONTEXT_VALID_R5   = 1 << 5,
    CONTEXT_VALID_R6   = 1 << 6,
    CONTEXT_VALID_R7   = 1 << 7,
    CONTEXT_VALID_R8   = 1 << 8,
    CONTEXT_VALID_R9   = 1 << 9,
    CONTEXT_VALID_R10  = 1 << 10,
    CONTEXT_VALID_R11  = 1 << 11,
    CONTEXT_VALID_R12  = 1 << 12,
    CONTEXT_VALID_R13  = 1 << 13,
    CONTEXT_VALID_R14  = 1 << 14,
    CONTEXT_VALID_R15  = 1 << 15,
    CONTEXT_VALID_ALL  = ~CONTEXT_VALID_NONE,

    // Aliases for registers with dedicated or conventional roles.
    CONTEXT_VALID_FP   = CONTEXT_VALID_R11,
    CONTEXT_VALID_SP   = CONTEXT_VALID_R13,
    CONTEXT_VALID_LR   = CONTEXT_VALID_R14,
    CONTEXT_VALID_PC   = CONTEXT_VALID_R15
  };

  StackFrameARM() : context(), context_validity(CONTEXT_VALID_NONE) {}

  // Return the ContextValidity flag for register rN.
  static ContextValidity RegisterValidFlag(int n) {
    return ContextValidity(1 << n);
  }

  // Register state.  This is only fully valid for the topmost frame in a
  // stack.  In other frames, the values of nonvolatile registers may be
  // present, given sufficient debugging information.  Refer to
  // context_validity.
  MDRawContextARM context;

  // For each register in context whose value has been recovered, we set
  // the corresponding CONTEXT_VALID_ bit in context_validity.
  //
  // context_validity's type should actually be ContextValidity, but
  // we use int instead because the bitwise inclusive or operator
  // yields an int when applied to enum values, and C++ doesn't
  // silently convert from ints to enums.
  int context_validity;
};

struct StackFrameARM64 : public StackFrame {
  // A flag for each register we might know. Note that we can't use an enum
  // here as there are 33 values to represent.
  static const uint64_t CONTEXT_VALID_NONE = 0;
  static const uint64_t CONTEXT_VALID_X0   = 1ULL << 0;
  static const uint64_t CONTEXT_VALID_X1   = 1ULL << 1;
  static const uint64_t CONTEXT_VALID_X2   = 1ULL << 2;
  static const uint64_t CONTEXT_VALID_X3   = 1ULL << 3;
  static const uint64_t CONTEXT_VALID_X4   = 1ULL << 4;
  static const uint64_t CONTEXT_VALID_X5   = 1ULL << 5;
  static const uint64_t CONTEXT_VALID_X6   = 1ULL << 6;
  static const uint64_t CONTEXT_VALID_X7   = 1ULL << 7;
  static const uint64_t CONTEXT_VALID_X8   = 1ULL << 8;
  static const uint64_t CONTEXT_VALID_X9   = 1ULL << 9;
  static const uint64_t CONTEXT_VALID_X10  = 1ULL << 10;
  static const uint64_t CONTEXT_VALID_X11  = 1ULL << 11;
  static const uint64_t CONTEXT_VALID_X12  = 1ULL << 12;
  static const uint64_t CONTEXT_VALID_X13  = 1ULL << 13;
  static const uint64_t CONTEXT_VALID_X14  = 1ULL << 14;
  static const uint64_t CONTEXT_VALID_X15  = 1ULL << 15;
  static const uint64_t CONTEXT_VALID_X16  = 1ULL << 16;
  static const uint64_t CONTEXT_VALID_X17  = 1ULL << 17;
  static const uint64_t CONTEXT_VALID_X18  = 1ULL << 18;
  static const uint64_t CONTEXT_VALID_X19  = 1ULL << 19;
  static const uint64_t CONTEXT_VALID_X20  = 1ULL << 20;
  static const uint64_t CONTEXT_VALID_X21  = 1ULL << 21;
  static const uint64_t CONTEXT_VALID_X22  = 1ULL << 22;
  static const uint64_t CONTEXT_VALID_X23  = 1ULL << 23;
  static const uint64_t CONTEXT_VALID_X24  = 1ULL << 24;
  static const uint64_t CONTEXT_VALID_X25  = 1ULL << 25;
  static const uint64_t CONTEXT_VALID_X26  = 1ULL << 26;
  static const uint64_t CONTEXT_VALID_X27  = 1ULL << 27;
  static const uint64_t CONTEXT_VALID_X28  = 1ULL << 28;
  static const uint64_t CONTEXT_VALID_X29  = 1ULL << 29;
  static const uint64_t CONTEXT_VALID_X30  = 1ULL << 30;
  static const uint64_t CONTEXT_VALID_X31  = 1ULL << 31;
  static const uint64_t CONTEXT_VALID_X32  = 1ULL << 32;
  static const uint64_t CONTEXT_VALID_ALL  = ~CONTEXT_VALID_NONE;

  // Aliases for registers with dedicated or conventional roles.
  static const uint64_t CONTEXT_VALID_FP   = CONTEXT_VALID_X29;
  static const uint64_t CONTEXT_VALID_LR   = CONTEXT_VALID_X30;
  static const uint64_t CONTEXT_VALID_SP   = CONTEXT_VALID_X31;
  static const uint64_t CONTEXT_VALID_PC   = CONTEXT_VALID_X32;

  StackFrameARM64() : context(),
                      context_validity(CONTEXT_VALID_NONE) {}

  // Return the validity flag for register xN.
  static uint64_t RegisterValidFlag(int n) {
    return 1ULL << n;
  }

  // Register state.  This is only fully valid for the topmost frame in a
  // stack.  In other frames, the values of nonvolatile registers may be
  // present, given sufficient debugging information.  Refer to
  // context_validity.
  MDRawContextARM64 context;

  // For each register in context whose value has been recovered, we set
  // the corresponding CONTEXT_VALID_ bit in context_validity.
  uint64_t context_validity;
};

struct StackFrameMIPS : public StackFrame {  
  // MIPS callee save registers for o32 ABI (32bit registers) are: 
  // 1. $s0-$s7, 
  // 2. $sp, $fp
  // 3. $f20-$f31 
  // 
  // The register structure is available at
  // http://en.wikipedia.org/wiki/MIPS_architecture#Compiler_register_usage

#define INDEX_MIPS_REG_S0 MD_CONTEXT_MIPS_REG_S0  // 16
#define INDEX_MIPS_REG_S7 MD_CONTEXT_MIPS_REG_S7  // 23
#define INDEX_MIPS_REG_GP MD_CONTEXT_MIPS_REG_GP  // 28
#define INDEX_MIPS_REG_RA MD_CONTEXT_MIPS_REG_RA  // 31
#define INDEX_MIPS_REG_PC 34 
#define SHIFT_MIPS_REG_S0 0
#define SHIFT_MIPS_REG_GP 8
#define SHIFT_MIPS_REG_PC 12 

  enum ContextValidity {
    CONTEXT_VALID_NONE = 0,
    CONTEXT_VALID_S0 = 1 << 0,  // $16
    CONTEXT_VALID_S1 = 1 << 1,  // $17
    CONTEXT_VALID_S2 = 1 << 2,  // $18
    CONTEXT_VALID_S3 = 1 << 3,  // $19
    CONTEXT_VALID_S4 = 1 << 4,  // $20
    CONTEXT_VALID_S5 = 1 << 5,  // $21
    CONTEXT_VALID_S6 = 1 << 6,  // $22
    CONTEXT_VALID_S7 = 1 << 7,  // $23
    // GP is not calee-save for o32 abi.
    CONTEXT_VALID_GP = 1 << 8,  // $28
    CONTEXT_VALID_SP = 1 << 9,  // $29
    CONTEXT_VALID_FP = 1 << 10,  // $30
    CONTEXT_VALID_RA = 1 << 11,  // $31  
    CONTEXT_VALID_PC = 1 << 12,  // $34
    CONTEXT_VALID_ALL = ~CONTEXT_VALID_NONE
  };
  
  // Return the ContextValidity flag for register rN.
  static ContextValidity RegisterValidFlag(int n) {
    if (n >= INDEX_MIPS_REG_S0 && n <= INDEX_MIPS_REG_S7)
      return ContextValidity(1 << (n - INDEX_MIPS_REG_S0 + SHIFT_MIPS_REG_S0));
    else if (n >= INDEX_MIPS_REG_GP && n <= INDEX_MIPS_REG_RA)
      return ContextValidity(1 << (n - INDEX_MIPS_REG_GP + SHIFT_MIPS_REG_GP));
    else if (n == INDEX_MIPS_REG_PC)
      return ContextValidity(1 << SHIFT_MIPS_REG_PC);

    return CONTEXT_VALID_NONE;
  }

  StackFrameMIPS() : context(), context_validity(CONTEXT_VALID_NONE) {}

  // Register state. This is only fully valid for the topmost frame in a
  // stack. In other frames, which registers are present depends on what
  // debugging information were available. Refer to 'context_validity' below.
  MDRawContextMIPS context;   

  // For each register in context whose value has been recovered,
  // the corresponding CONTEXT_VALID_ bit in 'context_validity' is set.
  //
  // context_validity's type should actually be ContextValidity, but
  // type int is used instead because the bitwise inclusive or operator
  // yields an int when applied to enum values, and C++ doesn't
  // silently convert from ints to enums.
  int context_validity;
};

}  // namespace google_breakpad

#endif  // GOOGLE_BREAKPAD_PROCESSOR_STACK_FRAME_CPU_H__