headers/libs/libunwind/libunwind-mips.h

   1 /* libunwind - a platform-independent unwind library
   2    Copyright (C) 2008 CodeSourcery
   3
   4 This file is part of libunwind.
   5
   6 Permission is hereby granted, free of charge, to any person obtaining
   7 a copy of this software and associated documentation files (the
   8 "Software"), to deal in the Software without restriction, including
   9 without limitation the rights to use, copy, modify, merge, publish,
  10 distribute, sublicense, and/or sell copies of the Software, and to
  11 permit persons to whom the Software is furnished to do so, subject to
  12 the following conditions:
  13
  14 The above copyright notice and this permission notice shall be
  15 included in all copies or substantial portions of the Software.
  16
  17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  21 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
  24
  25 #ifndef LIBUNWIND_H
  26 #define LIBUNWIND_H
  27
  28 #if defined(__cplusplus) || defined(c_plusplus)
  29 extern "C" {
  30 #endif
  31
  32 #include <inttypes.h>
  33 #include <ucontext.h>
  34
  35 #ifdef mips
  36 # undef mips
  37 #endif
  38
  39 #define UNW_TARGET      mips
  40 #define UNW_TARGET_MIPS 1
  41
  42 #define _U_TDEP_QP_TRUE 0       /* see libunwind-dynamic.h  */
  43
  44 /* This needs to be big enough to accommodate "struct cursor", while
  45    leaving some slack for future expansion.  Changing this value will
  46    require recompiling all users of this library.  Stack allocation is
  47    relatively cheap and unwind-state copying is relatively rare, so we
  48    want to err on making it rather too big than too small.  */
  49
  50 /* FIXME for MIPS. Too big?  What do other things use for similar tasks?  */
  51 #define UNW_TDEP_CURSOR_LEN     4096
  52
  53 /* The size of a "word" varies on MIPS.  This type is used for memory
  54    addresses and register values.  To allow a single library to support
  55    multiple ABIs, and to support N32 at all, we must use a 64-bit type
  56    even when addresses are only 32 bits.  */
  57 typedef uint64_t unw_word_t;
  58 typedef int32_t unw_sword_t;
  59
  60 /* FIXME: MIPS ABIs.  */
  61 typedef long double unw_tdep_fpreg_t;
  62
  63 typedef enum
  64   {
  65     UNW_MIPS_R0,
  66     UNW_MIPS_R1,
  67     UNW_MIPS_R2,
  68     UNW_MIPS_R3,
  69     UNW_MIPS_R4,
  70     UNW_MIPS_R5,
  71     UNW_MIPS_R6,
  72     UNW_MIPS_R7,
  73     UNW_MIPS_R8,
  74     UNW_MIPS_R9,
  75     UNW_MIPS_R10,
  76     UNW_MIPS_R11,
  77     UNW_MIPS_R12,
  78     UNW_MIPS_R13,
  79     UNW_MIPS_R14,
  80     UNW_MIPS_R15,
  81     UNW_MIPS_R16,
  82     UNW_MIPS_R17,
  83     UNW_MIPS_R18,
  84     UNW_MIPS_R19,
  85     UNW_MIPS_R20,
  86     UNW_MIPS_R21,
  87     UNW_MIPS_R22,
  88     UNW_MIPS_R23,
  89     UNW_MIPS_R24,
  90     UNW_MIPS_R25,
  91     UNW_MIPS_R26,
  92     UNW_MIPS_R27,
  93     UNW_MIPS_R28,
  94     UNW_MIPS_R29,
  95     UNW_MIPS_R30,
  96     UNW_MIPS_R31,
  97
  98     UNW_MIPS_PC = 34,
  99
 100     /* FIXME: Other registers!  */
 101
 102     /* For MIPS, the CFA is the value of SP (r29) at the call site in the
 103        previous frame.  */
 104     UNW_MIPS_CFA,
 105
 106     UNW_TDEP_LAST_REG = UNW_MIPS_R31,
 107
 108     UNW_TDEP_IP = UNW_MIPS_R31,
 109     UNW_TDEP_SP = UNW_MIPS_R29,
 110     UNW_TDEP_EH = UNW_MIPS_R0   /* FIXME.  */
 111   }
 112 mips_regnum_t;
 113
 114 typedef enum
 115   {
 116     UNW_MIPS_ABI_O32,
 117     UNW_MIPS_ABI_N32,
 118     UNW_MIPS_ABI_N64
 119   }
 120 mips_abi_t;
 121
 122 #define UNW_TDEP_NUM_EH_REGS    2       /* FIXME for MIPS.  */
 123
 124 typedef struct unw_tdep_save_loc
 125   {
 126     /* Additional target-dependent info on a save location.  */
 127   }
 128 unw_tdep_save_loc_t;
 129
 130 /* On x86, we can directly use ucontext_t as the unwind context.  FIXME for
 131    MIPS.  */
 132 typedef ucontext_t unw_tdep_context_t;
 133
 134 #include "libunwind-dynamic.h"
 135
 136 typedef struct
 137   {
 138     /* no mips-specific auxiliary proc-info */
 139   }
 140 unw_tdep_proc_info_t;
 141
 142 #include "libunwind-common.h"
 143
 144 /* There is no getcontext() on MIPS.  Use a stub version which only saves GP
 145    registers.  FIXME: Not ideal, may not be sufficient for all libunwind
 146    use cases.  */
 147 #define unw_tdep_getcontext UNW_ARCH_OBJ(getcontext)
 148 extern int unw_tdep_getcontext (ucontext_t *uc);
 149
 150 #define unw_tdep_is_fpreg               UNW_ARCH_OBJ(is_fpreg)
 151 extern int unw_tdep_is_fpreg (int);
 152
 153 #if defined(__cplusplus) || defined(c_plusplus)
 154 }
 155 #endif
 156
 157 #endif /* LIBUNWIND_H */