src/libs/libunwind/tilegx/Ginit.c

   1 /* libunwind - a platform-independent unwind library
   2    Copyright (C) 2008 CodeSourcery
   3    Copyright (C) 2014 Tilera Corp.
   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 /* Return the address of the 64-bit slot in UC for REG (even for o32,
  43    where registers are 32-bit, the slots are still 64-bit).  */
  44
  45 static inline void *
  46 uc_addr (ucontext_t *uc, int reg)
  47 {
  48   if (reg >= UNW_TILEGX_R0 && reg < UNW_TILEGX_R0 + 56)
  49     return &uc->uc_mcontext.gregs[reg - UNW_TILEGX_R0];
  50   else if (reg == UNW_TILEGX_PC)
  51     return &uc->uc_mcontext.pc;
  52   else
  53     return NULL;
  54 }
  55
  56 # ifdef UNW_LOCAL_ONLY
  57
  58 HIDDEN void *
  59 tdep_uc_addr (ucontext_t *uc, int reg)
  60 {
  61   char *addr = uc_addr (uc, reg);
  62   return addr;
  63 }
  64
  65 # endif /* UNW_LOCAL_ONLY */
  66
  67 HIDDEN unw_dyn_info_list_t _U_dyn_info_list;
  68
  69 /* XXX fix me: there is currently no way to locate the dyn-info list
  70        by a remote unwinder.  On ia64, this is done via a special
  71        unwind-table entry.  Perhaps something similar can be done with
  72        DWARF2 unwind info.  */
  73
  74 static void
  75 put_unwind_info (unw_addr_space_t as, unw_proc_info_t *proc_info, void *arg)
  76 {
  77   /* it's a no-op */
  78 }
  79
  80 static int
  81 get_dyn_info_list_addr (unw_addr_space_t as, unw_word_t *dyn_info_list_addr,
  82                         void *arg)
  83 {
  84   *dyn_info_list_addr = (unw_word_t) (intptr_t) &_U_dyn_info_list;
  85   return 0;
  86 }
  87
  88 static int
  89 access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, int write,
  90             void *arg)
  91 {
  92   if ((long long)addr & (sizeof(unw_word_t) - 1))
  93     return 0;
  94
  95   if (write)
  96     {
  97       Debug (16, "mem[%llx] <- %llx\n", (long long) addr, (long long) *val);
  98       *(unw_word_t *) (intptr_t) addr = *val;
  99     }
 100   else
 101     {
 102       *val = *(unw_word_t *) (intptr_t) addr;
 103       Debug (16, "mem[%llx] -> %llx\n", (long long) addr, (long long) *val);
 104     }
 105   return 0;
 106 }
 107
 108 static int
 109 access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val, int write,
 110             void *arg)
 111 {
 112   unw_word_t *addr;
 113   ucontext_t *uc = arg;
 114
 115   if (unw_is_fpreg (reg))
 116     goto badreg;
 117
 118   Debug (16, "reg = %s\n", unw_regname (reg));
 119   if (!(addr = uc_addr (uc, reg)))
 120     goto badreg;
 121
 122   if (write)
 123     {
 124       *(unw_word_t *) (intptr_t) addr = (tilegx_reg_t) *val;
 125       Debug (12, "%s <- %llx\n", unw_regname (reg), (long long) *val);
 126     }
 127   else
 128     {
 129       *val = (tilegx_reg_t) *(unw_word_t *) (intptr_t) addr;
 130       Debug (12, "%s -> %llx\n", unw_regname (reg), (long long) *val);
 131     }
 132   return 0;
 133
 134  badreg:
 135   Debug (1, "bad register number %u\n", reg);
 136   return -UNW_EBADREG;
 137 }
 138
 139 static int
 140 get_static_proc_name (unw_addr_space_t as, unw_word_t ip,
 141                       char *buf, size_t buf_len, unw_word_t *offp,
 142                       void *arg)
 143 {
 144   return elf_w (get_proc_name) (as, getpid (), ip, buf, buf_len, offp);
 145 }
 146
 147 __attribute__((weak)) void
 148 tilegx_local_addr_space_init (void)
 149 {
 150   memset (&local_addr_space, 0, sizeof (local_addr_space));
 151   local_addr_space.big_endian = (__BYTE_ORDER == __BIG_ENDIAN);
 152
 153   local_addr_space.abi = UNW_TILEGX_ABI_N64;
 154   local_addr_space.addr_size = sizeof (void *);
 155   local_addr_space.caching_policy = UNW_CACHE_GLOBAL;
 156   local_addr_space.acc.find_proc_info = dwarf_find_proc_info;
 157   local_addr_space.acc.put_unwind_info = put_unwind_info;
 158   local_addr_space.acc.get_dyn_info_list_addr = get_dyn_info_list_addr;
 159   local_addr_space.acc.access_mem = access_mem;
 160   local_addr_space.acc.access_reg = access_reg;
 161   local_addr_space.acc.access_fpreg = NULL;
 162   local_addr_space.acc.resume = tilegx_local_resume;
 163   local_addr_space.acc.get_proc_name = get_static_proc_name;
 164   unw_flush_cache (&local_addr_space, 0, 0);
 165 }
 166
 167 #endif /* !UNW_REMOTE_ONLY */