text: /* libunwind - a platform-independent unwind library
     Copyright (C) 2008 CodeSourcery
     Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.com>
     Copyright (C) 2013 Linaro Limited
  
  This file is part of libunwind.
  
  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:
  
  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
  
  #include <stdlib.h>
  #include <string.h>
  
  #include "unwind_i.h"
  
  #ifdef UNW_REMOTE_ONLY
  
  /* unw_local_addr_space is a NULL pointer in this case.  */
  PROTECTED unw_addr_space_t unw_local_addr_space;
  
  #else /* !UNW_REMOTE_ONLY */
  
  static struct unw_addr_space local_addr_space;
  
  PROTECTED unw_addr_space_t unw_local_addr_space = &local_addr_space;
  
  static inline void *
  uc_addr (ucontext_t *uc, int reg)
  {
    if (reg >= UNW_AARCH64_X0 && reg <= UNW_AARCH64_V31)
      return &uc->uc_mcontext.regs[reg];
    else
      return NULL;
  }
  
  # ifdef UNW_LOCAL_ONLY
  
  HIDDEN void *
  tdep_uc_addr (ucontext_t *uc, int reg)
  {
    return uc_addr (uc, reg);
  }
  
  # endif /* UNW_LOCAL_ONLY */
  
  HIDDEN unw_dyn_info_list_t _U_dyn_info_list;
  
  /* XXX fix me: there is currently no way to locate the dyn-info list
         by a remote unwinder.  On ia64, this is done via a special
         unwind-table entry.  Perhaps something similar can be done with
         DWARF2 unwind info.  */
  
  static void
  put_unwind_info (unw_addr_space_t as, unw_proc_info_t *proc_info, void *arg)
  {
    /* it's a no-op */
  }
  
  static int
  get_dyn_info_list_addr (unw_addr_space_t as, unw_word_t *dyn_info_list_addr,
  			void *arg)
  {
    *dyn_info_list_addr = (unw_word_t) &_U_dyn_info_list;
    return 0;
  }
  
  static int
  access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, int write,
  	    void *arg)
  {
    if (write)
      {
        Debug (16, "mem[%x] <- %x\n", addr, *val);
        *(unw_word_t *) addr = *val;
      }
    else
      {
        *val = *(unw_word_t *) addr;
        Debug (16, "mem[%x] -> %x\n", addr, *val);
      }
    return 0;
  }
  
  static int
  access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val, int write,
  	    void *arg)
  {
    unw_word_t *addr;
    ucontext_t *uc = arg;
  
    if (unw_is_fpreg (reg))
      goto badreg;
  
    if (!(addr = uc_addr (uc, reg)))
      goto badreg;
  
    if (write)
      {
        *(unw_word_t *) addr = *val;
        Debug (12, "%s <- %x\n", unw_regname (reg), *val);
      }
    else
      {
        *val = *(unw_word_t *) addr;
        Debug (12, "%s -> %x\n", unw_regname (reg), *val);
      }
    return 0;
  
   badreg:
    Debug (1, "bad register number %u\n", reg);
    return -UNW_EBADREG;
  }
  
  static int
  access_fpreg (unw_addr_space_t as, unw_regnum_t reg, unw_fpreg_t *val,
  	      int write, void *arg)
  {
    ucontext_t *uc = arg;
    unw_fpreg_t *addr;
  
    if (!unw_is_fpreg (reg))
      goto badreg;
  
    if (!(addr = uc_addr (uc, reg)))
      goto badreg;
  
    if (write)
      {
        Debug (12, "%s <- %08lx.%08lx.%08lx\n", unw_regname (reg),
  	     ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]);
        *(unw_fpreg_t *) addr = *val;
      }
    else
      {
        *val = *(unw_fpreg_t *) addr;
        Debug (12, "%s -> %08lx.%08lx.%08lx\n", unw_regname (reg),
  	     ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]);
      }
    return 0;
  
   badreg:
    Debug (1, "bad register number %u\n", reg);
    /* attempt to access a non-preserved register */
    return -UNW_EBADREG;
  }
  
  static int
  get_static_proc_name (unw_addr_space_t as, unw_word_t ip,
  		      char *buf, size_t buf_len, unw_word_t *offp,
  		      void *arg)
  {
    return _Uelf64_get_proc_name (as, getpid (), ip, buf, buf_len, offp);
  }
  
  HIDDEN void
  aarch64_local_addr_space_init (void)
  {
    memset (&local_addr_space, 0, sizeof (local_addr_space));
    local_addr_space.caching_policy = UNW_CACHE_GLOBAL;
    local_addr_space.acc.find_proc_info = dwarf_find_proc_info;
    local_addr_space.acc.put_unwind_info = put_unwind_info;
    local_addr_space.acc.get_dyn_info_list_addr = get_dyn_info_list_addr;
    local_addr_space.acc.access_mem = access_mem;
    local_addr_space.acc.access_reg = access_reg;
    local_addr_space.acc.access_fpreg = access_fpreg;
    local_addr_space.acc.resume = aarch64_local_resume;
    local_addr_space.acc.get_proc_name = get_static_proc_name;
    unw_flush_cache (&local_addr_space, 0, 0);
  }
  
  #endif /* !UNW_REMOTE_ONLY */
  