src/libs/libunwind/ppc64/Gresume.c

   1 /* libunwind - a platform-independent unwind library
   2    Copyright (C) 2006-2007 IBM
   3    Contributed by
   4      Corey Ashford cjashfor@us.ibm.com
   5      Jose Flavio Aguilar Paulino <jflavio@br.ibm.com> <joseflavio@gmail.com>
   6
   7 This file is part of libunwind.
   8
   9 Permission is hereby granted, free of charge, to any person obtaining
  10 a copy of this software and associated documentation files (the
  11 "Software"), to deal in the Software without restriction, including
  12 without limitation the rights to use, copy, modify, merge, publish,
  13 distribute, sublicense, and/or sell copies of the Software, and to
  14 permit persons to whom the Software is furnished to do so, subject to
  15 the following conditions:
  16
  17 The above copyright notice and this permission notice shall be
  18 included in all copies or substantial portions of the Software.
  19
  20 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
  27
  28 #include <stdlib.h>
  29
  30 #include "unwind_i.h"
  31
  32 #ifndef UNW_REMOTE_ONLY
  33
  34 #include <sys/syscall.h>
  35
  36 /* sigreturn() is a no-op on x86_64 glibc.  */
  37
  38 static NORETURN inline long
  39 my_rt_sigreturn (void *new_sp)
  40 {
  41   /* XXX: empty stub.  */
  42   abort ();
  43 }
  44
  45 HIDDEN inline int
  46 ppc64_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg)
  47 {
  48   struct cursor *c = (struct cursor *) cursor;
  49   ucontext_t *uc = (ucontext_t *)c->dwarf.as_arg;
  50
  51   if (unlikely (c->sigcontext_format != PPC_SCF_NONE))
  52     {
  53       my_rt_sigreturn(cursor);
  54       abort();
  55     }
  56   else
  57     {
  58       Debug (8, "resuming at ip=%llx via setcontext()\n",
  59              (unsigned long long) c->dwarf.ip);
  60       setcontext (uc);
  61     }
  62   return -UNW_EINVAL;
  63 }
  64
  65 #endif /* !UNW_REMOTE_ONLY */
  66
  67 /* This routine is responsible for copying the register values in
  68    cursor C and establishing them as the current machine state. */
  69
  70 static inline int
  71 establish_machine_state (struct cursor *c)
  72 {
  73   unw_addr_space_t as = c->dwarf.as;
  74   void *arg = c->dwarf.as_arg;
  75   unw_fpreg_t fpval;
  76   unw_word_t val;
  77   int reg;
  78
  79   Debug (8, "copying out cursor state\n");
  80
  81   for (reg = 0; reg <= UNW_REG_LAST; ++reg)
  82     {
  83       Debug (16, "copying %s %d\n", unw_regname (reg), reg);
  84       if (unw_is_fpreg (reg))
  85         {
  86           if (tdep_access_fpreg (c, reg, &fpval, 0) >= 0)
  87             as->acc.access_fpreg (as, reg, &fpval, 1, arg);
  88         }
  89       else
  90         {
  91           if (tdep_access_reg (c, reg, &val, 0) >= 0)
  92             as->acc.access_reg (as, reg, &val, 1, arg);
  93         }
  94     }
  95   return 0;
  96 }
  97
  98 PROTECTED int
  99 unw_resume (unw_cursor_t *cursor)
 100 {
 101   struct cursor *c = (struct cursor *) cursor;
 102   int ret;
 103
 104   Debug (1, "(cursor=%p)\n", c);
 105
 106   if ((ret = establish_machine_state (c)) < 0)
 107     return ret;
 108
 109   return (*c->dwarf.as->acc.resume) (c->dwarf.as, (unw_cursor_t *) c,
 110                                      c->dwarf.as_arg);
 111 }