text: /* libunwind - a platform-independent unwind library
     Copyright (C) 2008 CodeSourcery
  
  This file is part of libunwind.
  
  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:
  
  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
  
  #ifndef LIBUNWIND_H
  #define LIBUNWIND_H
  
  #if defined(__cplusplus) || defined(c_plusplus)
  extern "C" {
  #endif
  
  #include <inttypes.h>
  #include <ucontext.h>
  
  #ifdef mips
  # undef mips
  #endif
  
  #define UNW_TARGET      mips
  #define UNW_TARGET_MIPS 1
  
  #define _U_TDEP_QP_TRUE 0       /* see libunwind-dynamic.h  */
  
  /* This needs to be big enough to accommodate "struct cursor", while
     leaving some slack for future expansion.  Changing this value will
     require recompiling all users of this library.  Stack allocation is
     relatively cheap and unwind-state copying is relatively rare, so we
     want to err on making it rather too big than too small.  */
     
  /* FIXME for MIPS. Too big?  What do other things use for similar tasks?  */
  #define UNW_TDEP_CURSOR_LEN     4096
  
  /* The size of a "word" varies on MIPS. This type is used for memory
     addresses and register values, which are 32-bit wide for O32 and N32 
     ABIs, and 64-bit wide for N64 ABI. */
  #if _MIPS_SIM == _ABI64
  typedef uint64_t unw_word_t;
  #else
  typedef uint32_t unw_word_t;
  #endif
  typedef int32_t unw_sword_t;
  
  /* FIXME: MIPS ABIs.  */
  typedef long double unw_tdep_fpreg_t;
  
  typedef enum
    {
      UNW_MIPS_R0,
      UNW_MIPS_R1,
      UNW_MIPS_R2,
      UNW_MIPS_R3,
      UNW_MIPS_R4,
      UNW_MIPS_R5,
      UNW_MIPS_R6,
      UNW_MIPS_R7,
      UNW_MIPS_R8,
      UNW_MIPS_R9,
      UNW_MIPS_R10,
      UNW_MIPS_R11,
      UNW_MIPS_R12,
      UNW_MIPS_R13,
      UNW_MIPS_R14,
      UNW_MIPS_R15,
      UNW_MIPS_R16,
      UNW_MIPS_R17,
      UNW_MIPS_R18,
      UNW_MIPS_R19,
      UNW_MIPS_R20,
      UNW_MIPS_R21,
      UNW_MIPS_R22,
      UNW_MIPS_R23,
      UNW_MIPS_R24,
      UNW_MIPS_R25,
      UNW_MIPS_R26,
      UNW_MIPS_R27,
      UNW_MIPS_R28,
      UNW_MIPS_R29,
      UNW_MIPS_R30,
      UNW_MIPS_R31,
  
      UNW_MIPS_PC = 64,
  
      /* FIXME: Other registers!  */
  
      /* For MIPS, the CFA is the value of SP (r29) at the call site in the
         previous frame.  */
      UNW_MIPS_CFA,
  
      UNW_TDEP_LAST_REG = UNW_MIPS_PC,
  
      UNW_TDEP_IP = UNW_MIPS_R31,
      UNW_TDEP_SP = UNW_MIPS_R29,
      UNW_TDEP_EH = UNW_MIPS_R0   /* FIXME.  */
    }
  mips_regnum_t;
  
  typedef enum
    {
      UNW_MIPS_ABI_O32,
      UNW_MIPS_ABI_N32,
      UNW_MIPS_ABI_N64
    }
  mips_abi_t;
  
  #define UNW_TDEP_NUM_EH_REGS    2       /* FIXME for MIPS.  */
  
  typedef struct unw_tdep_save_loc
    {
      /* Additional target-dependent info on a save location.  */
    }
  unw_tdep_save_loc_t;
  
  /* On x86, we can directly use ucontext_t as the unwind context.  FIXME for
     MIPS.  */
  typedef ucontext_t unw_tdep_context_t;
  
  #include "libunwind-dynamic.h"
  
  typedef struct
    {
      /* no mips-specific auxiliary proc-info */
    }
  unw_tdep_proc_info_t;
  
  #include "libunwind-common.h"
  
  /* There is no getcontext() on MIPS.  Use a stub version which only saves GP
     registers.  FIXME: Not ideal, may not be sufficient for all libunwind
     use cases.  */
  #define unw_tdep_getcontext UNW_ARCH_OBJ(getcontext)
  extern int unw_tdep_getcontext (ucontext_t *uc);
  
  #define unw_tdep_is_fpreg               UNW_ARCH_OBJ(is_fpreg)
  extern int unw_tdep_is_fpreg (int);
  
  #if defined(__cplusplus) || defined(c_plusplus)
  }
  #endif
  
  #endif /* LIBUNWIND_H */
  