src/libs/libunwind/aarch64/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    Copyright (C) 2013 Linaro Limited
   5
   6 This file is part of libunwind.
   7
   8 Permission is hereby granted, free of charge, to any person obtaining
   9 a copy of this software and associated documentation files (the
  10 "Software"), to deal in the Software without restriction, including
  11 without limitation the rights to use, copy, modify, merge, publish,
  12 distribute, sublicense, and/or sell copies of the Software, and to
  13 permit persons to whom the Software is furnished to do so, subject to
  14 the following conditions:
  15
  16 The above copyright notice and this permission notice shall be
  17 included in all copies or substantial portions of the Software.
  18
  19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  20 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  22 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  23 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  24 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  25 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
  26
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "unwind_i.h"
  31
  32 #ifdef UNW_REMOTE_ONLY
  33
  34 /* unw_local_addr_space is a NULL pointer in this case.  */
  35 PROTECTED unw_addr_space_t unw_local_addr_space;
  36
  37 #else /* !UNW_REMOTE_ONLY */
  38
  39 static struct unw_addr_space local_addr_space;
  40
  41 PROTECTED unw_addr_space_t unw_local_addr_space = &local_addr_space;
  42
  43 static inline void *
  44 uc_addr (ucontext_t *uc, int reg)
  45 {
  46   if (reg >= UNW_AARCH64_X0 && reg < UNW_AARCH64_V0)
  47     return &uc->uc_mcontext.regs[reg];
  48   else if (reg >= UNW_AARCH64_V0 && reg <= UNW_AARCH64_V31)
  49     return &GET_FPCTX(uc)->vregs[reg - UNW_AARCH64_V0];
  50   else
  51     return NULL;
  52 }
  53
  54 # ifdef UNW_LOCAL_ONLY
  55
  56 HIDDEN void *
  57 tdep_uc_addr (ucontext_t *uc, int reg)
  58 {
  59   return uc_addr (uc, reg);
  60 }
  61
  62 # endif /* UNW_LOCAL_ONLY */
  63
  64 HIDDEN unw_dyn_info_list_t _U_dyn_info_list;
  65
  66 /* XXX fix me: there is currently no way to locate the dyn-info list
  67        by a remote unwinder.  On ia64, this is done via a special
  68        unwind-table entry.  Perhaps something similar can be done with
  69        DWARF2 unwind info.  */
  70
  71 static void
  72 put_unwind_info (unw_addr_space_t as, unw_proc_info_t *proc_info, void *arg)
  73 {
  74   /* it's a no-op */
  75 }
  76
  77 static int
  78 get_dyn_info_list_addr (unw_addr_space_t as, unw_word_t *dyn_info_list_addr,
  79                         void *arg)
  80 {
  81   *dyn_info_list_addr = (unw_word_t) &_U_dyn_info_list;
  82   return 0;
  83 }
  84
  85 static int
  86 access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, int write,
  87             void *arg)
  88 {
  89   if (write)
  90     {
  91       Debug (16, "mem[%lx] <- %lx\n", addr, *val);
  92       *(unw_word_t *) addr = *val;
  93     }
  94   else
  95     {
  96       *val = *(unw_word_t *) addr;
  97       Debug (16, "mem[%lx] -> %lx\n", addr, *val);
  98     }
  99   return 0;
 100 }
 101
 102 static int
 103 access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val, int write,
 104             void *arg)
 105 {
 106   unw_word_t *addr;
 107   ucontext_t *uc = arg;
 108
 109   if (unw_is_fpreg (reg))
 110     goto badreg;
 111
 112   if (!(addr = uc_addr (uc, reg)))
 113     goto badreg;
 114
 115   if (write)
 116     {
 117       *(unw_word_t *) addr = *val;
 118       Debug (12, "%s <- %lx\n", unw_regname (reg), *val);
 119     }
 120   else
 121     {
 122       *val = *(unw_word_t *) addr;
 123       Debug (12, "%s -> %lx\n", unw_regname (reg), *val);
 124     }
 125   return 0;
 126
 127  badreg:
 128   Debug (1, "bad register number %u\n", reg);
 129   return -UNW_EBADREG;
 130 }
 131
 132 static int
 133 access_fpreg (unw_addr_space_t as, unw_regnum_t reg, unw_fpreg_t *val,
 134               int write, void *arg)
 135 {
 136   ucontext_t *uc = arg;
 137   unw_fpreg_t *addr;
 138
 139   if (!unw_is_fpreg (reg))
 140     goto badreg;
 141
 142   if (!(addr = uc_addr (uc, reg)))
 143     goto badreg;
 144
 145   if (write)
 146     {
 147       Debug (12, "%s <- %08lx.%08lx.%08lx\n", unw_regname (reg),
 148              ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]);
 149       *(unw_fpreg_t *) addr = *val;
 150     }
 151   else
 152     {
 153       *val = *(unw_fpreg_t *) addr;
 154       Debug (12, "%s -> %08lx.%08lx.%08lx\n", unw_regname (reg),
 155              ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]);
 156     }
 157   return 0;
 158
 159  badreg:
 160   Debug (1, "bad register number %u\n", reg);
 161   /* attempt to access a non-preserved register */
 162   return -UNW_EBADREG;
 163 }
 164
 165 static int
 166 get_static_proc_name (unw_addr_space_t as, unw_word_t ip,
 167                       char *buf, size_t buf_len, unw_word_t *offp,
 168                       void *arg)
 169 {
 170   return _Uelf64_get_proc_name (as, getpid (), ip, buf, buf_len, offp);
 171 }
 172
 173 HIDDEN void
 174 aarch64_local_addr_space_init (void)
 175 {
 176   memset (&local_addr_space, 0, sizeof (local_addr_space));
 177   local_addr_space.caching_policy = UNW_CACHE_GLOBAL;
 178   local_addr_space.acc.find_proc_info = dwarf_find_proc_info;
 179   local_addr_space.acc.put_unwind_info = put_unwind_info;
 180   local_addr_space.acc.get_dyn_info_list_addr = get_dyn_info_list_addr;
 181   local_addr_space.acc.access_mem = access_mem;
 182   local_addr_space.acc.access_reg = access_reg;
 183   local_addr_space.acc.access_fpreg = access_fpreg;
 184   local_addr_space.acc.resume = aarch64_local_resume;
 185   local_addr_space.acc.get_proc_name = get_static_proc_name;
 186   local_addr_space.big_endian = (__BYTE_ORDER == __BIG_ENDIAN);
 187   unw_flush_cache (&local_addr_space, 0, 0);
 188 }
 189
 190 #endif /* !UNW_REMOTE_ONLY */