src/libs/libunwind/mips/Ginit.c

   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 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include "unwind_i.h"
  29
  30 #ifdef UNW_REMOTE_ONLY
  31
  32 /* unw_local_addr_space is a NULL pointer in this case.  */
  33 PROTECTED unw_addr_space_t unw_local_addr_space;
  34
  35 #else /* !UNW_REMOTE_ONLY */
  36
  37 static struct unw_addr_space local_addr_space;
  38
  39 PROTECTED unw_addr_space_t unw_local_addr_space = &local_addr_space;
  40
  41 /* Return the address of the 64-bit slot in UC for REG (even for o32,
  42    where registers are 32-bit, the slots are still 64-bit).  */
  43
  44 static inline void *
  45 uc_addr (ucontext_t *uc, int reg)
  46 {
  47   if (reg >= UNW_MIPS_R0 && reg < UNW_MIPS_R0 + 32)
  48     return &uc->uc_mcontext.gregs[reg - UNW_MIPS_R0];
  49   else if (reg == UNW_MIPS_PC)
  50     return &uc->uc_mcontext.pc;
  51   else
  52     return NULL;
  53 }
  54
  55 # ifdef UNW_LOCAL_ONLY
  56
  57 HIDDEN void *
  58 tdep_uc_addr (ucontext_t *uc, int reg)
  59 {
  60   char *addr = uc_addr (uc, reg);
  61
  62   if (reg >= UNW_MIPS_R0 && reg <= UNW_MIPS_R31
  63       && tdep_big_endian (unw_local_addr_space)
  64       && unw_local_addr_space->abi == UNW_MIPS_ABI_O32)
  65     addr += 4;
  66
  67   return addr;
  68 }
  69
  70 # endif /* UNW_LOCAL_ONLY */
  71
  72 HIDDEN unw_dyn_info_list_t _U_dyn_info_list;
  73
  74 /* XXX fix me: there is currently no way to locate the dyn-info list
  75        by a remote unwinder.  On ia64, this is done via a special
  76        unwind-table entry.  Perhaps something similar can be done with
  77        DWARF2 unwind info.  */
  78
  79 static void
  80 put_unwind_info (unw_addr_space_t as, unw_proc_info_t *proc_info, void *arg)
  81 {
  82   /* it's a no-op */
  83 }
  84
  85 static int
  86 get_dyn_info_list_addr (unw_addr_space_t as, unw_word_t *dyn_info_list_addr,
  87                         void *arg)
  88 {
  89   *dyn_info_list_addr = (unw_word_t) (intptr_t) &_U_dyn_info_list;
  90   return 0;
  91 }
  92
  93 static int
  94 access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, int write,
  95             void *arg)
  96 {
  97   if (write)
  98     {
  99       Debug (16, "mem[%llx] <- %llx\n", (long long) addr, (long long) *val);
 100       *(unw_word_t *) (intptr_t) addr = *val;
 101     }
 102   else
 103     {
 104       *val = *(unw_word_t *) (intptr_t) addr;
 105       Debug (16, "mem[%llx] -> %llx\n", (long long) addr, (long long) *val);
 106     }
 107   return 0;
 108 }
 109
 110 static int
 111 access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val, int write,
 112             void *arg)
 113 {
 114   unw_word_t *addr;
 115   ucontext_t *uc = arg;
 116
 117   if (unw_is_fpreg (reg))
 118     goto badreg;
 119
 120   Debug (16, "reg = %s\n", unw_regname (reg));
 121   if (!(addr = uc_addr (uc, reg)))
 122     goto badreg;
 123
 124   if (write)
 125     {
 126       *(unw_word_t *) (intptr_t) addr = (mips_reg_t) *val;
 127       Debug (12, "%s <- %llx\n", unw_regname (reg), (long long) *val);
 128     }
 129   else
 130     {
 131       *val = (mips_reg_t) *(unw_word_t *) (intptr_t) addr;
 132       Debug (12, "%s -> %llx\n", unw_regname (reg), (long long) *val);
 133     }
 134   return 0;
 135
 136  badreg:
 137   Debug (1, "bad register number %u\n", reg);
 138   return -UNW_EBADREG;
 139 }
 140
 141 static int
 142 access_fpreg (unw_addr_space_t as, unw_regnum_t reg, unw_fpreg_t *val,
 143               int write, void *arg)
 144 {
 145   ucontext_t *uc = arg;
 146   unw_fpreg_t *addr;
 147
 148   if (!unw_is_fpreg (reg))
 149     goto badreg;
 150
 151   if (!(addr = uc_addr (uc, reg)))
 152     goto badreg;
 153
 154   if (write)
 155     {
 156       Debug (12, "%s <- %08lx.%08lx.%08lx\n", unw_regname (reg),
 157              ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]);
 158       *(unw_fpreg_t *) (intptr_t) addr = *val;
 159     }
 160   else
 161     {
 162       *val = *(unw_fpreg_t *) (intptr_t) addr;
 163       Debug (12, "%s -> %08lx.%08lx.%08lx\n", unw_regname (reg),
 164              ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]);
 165     }
 166   return 0;
 167
 168  badreg:
 169   Debug (1, "bad register number %u\n", reg);
 170   /* attempt to access a non-preserved register */
 171   return -UNW_EBADREG;
 172 }
 173
 174 static int
 175 get_static_proc_name (unw_addr_space_t as, unw_word_t ip,
 176                       char *buf, size_t buf_len, unw_word_t *offp,
 177                       void *arg)
 178 {
 179
 180   return elf_w (get_proc_name) (as, getpid (), ip, buf, buf_len, offp);
 181 }
 182
 183 HIDDEN void
 184 mips_local_addr_space_init (void)
 185 {
 186   memset (&local_addr_space, 0, sizeof (local_addr_space));
 187   local_addr_space.big_endian = (__BYTE_ORDER == __BIG_ENDIAN);
 188 #if _MIPS_SIM == _ABIO32
 189   local_addr_space.abi = UNW_MIPS_ABI_O32;
 190 #elif _MIPS_SIM == _ABIN32
 191   local_addr_space.abi = UNW_MIPS_ABI_N32;
 192 #elif _MIPS_SIM == _ABI64
 193   local_addr_space.abi = UNW_MIPS_ABI_N64;
 194 #else
 195 # error Unsupported ABI
 196 #endif
 197   local_addr_space.addr_size = sizeof (void *);
 198   local_addr_space.caching_policy = UNW_CACHE_GLOBAL;
 199   local_addr_space.acc.find_proc_info = dwarf_find_proc_info;
 200   local_addr_space.acc.put_unwind_info = put_unwind_info;
 201   local_addr_space.acc.get_dyn_info_list_addr = get_dyn_info_list_addr;
 202   local_addr_space.acc.access_mem = access_mem;
 203   local_addr_space.acc.access_reg = access_reg;
 204   local_addr_space.acc.access_fpreg = access_fpreg;
 205   local_addr_space.acc.resume = NULL;  /* mips_local_resume?  FIXME!  */
 206   local_addr_space.acc.get_proc_name = get_static_proc_name;
 207   unw_flush_cache (&local_addr_space, 0, 0);
 208 }
 209
 210 #endif /* !UNW_REMOTE_ONLY */