src/libs/libunwind/sh/Ginit.c

   1 /* libunwind - a platform-independent unwind library
   2    Copyright (C) 2008 CodeSourcery
   3    Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.com>
   4
   5 This file is part of libunwind.
   6
   7 Permission is hereby granted, free of charge, to any person obtaining
   8 a copy of this software and associated documentation files (the
   9 "Software"), to deal in the Software without restriction, including
  10 without limitation the rights to use, copy, modify, merge, publish,
  11 distribute, sublicense, and/or sell copies of the Software, and to
  12 permit persons to whom the Software is furnished to do so, subject to
  13 the following conditions:
  14
  15 The above copyright notice and this permission notice shall be
  16 included in all copies or substantial portions of the Software.
  17
  18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
  25
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #include "unwind_i.h"
  30
  31 #ifdef UNW_REMOTE_ONLY
  32
  33 /* unw_local_addr_space is a NULL pointer in this case.  */
  34 PROTECTED unw_addr_space_t unw_local_addr_space;
  35
  36 #else /* !UNW_REMOTE_ONLY */
  37
  38 static struct unw_addr_space local_addr_space;
  39
  40 PROTECTED unw_addr_space_t unw_local_addr_space = &local_addr_space;
  41
  42 static inline void *
  43 uc_addr (ucontext_t *uc, int reg)
  44 {
  45   if (reg >= UNW_SH_R0 && reg <= UNW_SH_PR)
  46     return &uc->uc_mcontext.gregs[reg];
  47   else
  48     return NULL;
  49 }
  50
  51 # ifdef UNW_LOCAL_ONLY
  52
  53 HIDDEN void *
  54 tdep_uc_addr (ucontext_t *uc, int reg)
  55 {
  56   return uc_addr (uc, reg);
  57 }
  58
  59 # endif /* UNW_LOCAL_ONLY */
  60
  61 HIDDEN unw_dyn_info_list_t _U_dyn_info_list;
  62
  63 /* XXX fix me: there is currently no way to locate the dyn-info list
  64        by a remote unwinder.  On ia64, this is done via a special
  65        unwind-table entry.  Perhaps something similar can be done with
  66        DWARF2 unwind info.  */
  67
  68 static void
  69 put_unwind_info (unw_addr_space_t as, unw_proc_info_t *proc_info, void *arg)
  70 {
  71   /* it's a no-op */
  72 }
  73
  74 static int
  75 get_dyn_info_list_addr (unw_addr_space_t as, unw_word_t *dyn_info_list_addr,
  76                         void *arg)
  77 {
  78   *dyn_info_list_addr = (unw_word_t) &_U_dyn_info_list;
  79   return 0;
  80 }
  81
  82 static int
  83 access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, int write,
  84             void *arg)
  85 {
  86   if (write)
  87     {
  88       Debug (16, "mem[%x] <- %x\n", addr, *val);
  89       *(unw_word_t *) addr = *val;
  90     }
  91   else
  92     {
  93       *val = *(unw_word_t *) addr;
  94       Debug (16, "mem[%x] -> %x\n", addr, *val);
  95     }
  96   return 0;
  97 }
  98
  99 static int
 100 access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val, int write,
 101             void *arg)
 102 {
 103   unw_word_t *addr;
 104   ucontext_t *uc = arg;
 105
 106   if (unw_is_fpreg (reg))
 107     goto badreg;
 108
 109   if (!(addr = uc_addr (uc, reg)))
 110     goto badreg;
 111
 112   if (write)
 113     {
 114       *(unw_word_t *) addr = *val;
 115       Debug (12, "%s <- %x\n", unw_regname (reg), *val);
 116     }
 117   else
 118     {
 119       *val = *(unw_word_t *) addr;
 120       Debug (12, "%s -> %x\n", unw_regname (reg), *val);
 121     }
 122   return 0;
 123
 124  badreg:
 125   Debug (1, "bad register number %u\n", reg);
 126   return -UNW_EBADREG;
 127 }
 128
 129 static int
 130 access_fpreg (unw_addr_space_t as, unw_regnum_t reg, unw_fpreg_t *val,
 131               int write, void *arg)
 132 {
 133   ucontext_t *uc = arg;
 134   unw_fpreg_t *addr;
 135
 136   if (!unw_is_fpreg (reg))
 137     goto badreg;
 138
 139   if (!(addr = uc_addr (uc, reg)))
 140     goto badreg;
 141
 142   if (write)
 143     {
 144       Debug (12, "%s <- %08lx.%08lx.%08lx\n", unw_regname (reg),
 145              ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]);
 146       *(unw_fpreg_t *) addr = *val;
 147     }
 148   else
 149     {
 150       *val = *(unw_fpreg_t *) addr;
 151       Debug (12, "%s -> %08lx.%08lx.%08lx\n", unw_regname (reg),
 152              ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]);
 153     }
 154   return 0;
 155
 156  badreg:
 157   Debug (1, "bad register number %u\n", reg);
 158   /* attempt to access a non-preserved register */
 159   return -UNW_EBADREG;
 160 }
 161
 162 static int
 163 get_static_proc_name (unw_addr_space_t as, unw_word_t ip,
 164                       char *buf, size_t buf_len, unw_word_t *offp,
 165                       void *arg)
 166 {
 167   return _Uelf32_get_proc_name (as, getpid (), ip, buf, buf_len, offp);
 168 }
 169
 170 HIDDEN void
 171 sh_local_addr_space_init (void)
 172 {
 173   memset (&local_addr_space, 0, sizeof (local_addr_space));
 174   local_addr_space.caching_policy = UNW_CACHE_GLOBAL;
 175   local_addr_space.acc.find_proc_info = dwarf_find_proc_info;
 176   local_addr_space.acc.put_unwind_info = put_unwind_info;
 177   local_addr_space.acc.get_dyn_info_list_addr = get_dyn_info_list_addr;
 178   local_addr_space.acc.access_mem = access_mem;
 179   local_addr_space.acc.access_reg = access_reg;
 180   local_addr_space.acc.access_fpreg = access_fpreg;
 181   local_addr_space.acc.resume = sh_local_resume;
 182   local_addr_space.acc.get_proc_name = get_static_proc_name;
 183   unw_flush_cache (&local_addr_space, 0, 0);
 184 }
 185
 186 #endif /* !UNW_REMOTE_ONLY */