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      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 */
    158