Coverage Report

Created: 2024-06-18 06:15

/src/libunwind/src/x86_64/Gresume.c
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/* libunwind - a platform-independent unwind library
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   Copyright (c) 2002-2004 Hewlett-Packard Development Company, L.P.
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        Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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   Modified for x86_64 by Max Asbock <masbock@us.ibm.com>
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
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#include <stdlib.h>
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#include "libunwind_i.h"
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#include "unwind_i.h"
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#ifndef UNW_REMOTE_ONLY
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HIDDEN inline int
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x86_64_local_resume (unw_addr_space_t as UNUSED, unw_cursor_t *cursor, void *arg UNUSED)
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0
{
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  struct cursor *c = (struct cursor *) cursor;
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  ucontext_t *uc = dwarf_get_uc(&c->dwarf);
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  /* Ensure c->pi is up-to-date.  On x86-64, it's relatively common to
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     be missing DWARF unwind info.  We don't want to fail in that
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     case, because the frame-chain still would let us do a backtrace
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     at least.  */
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  dwarf_make_proc_info (&c->dwarf);
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  if (unlikely (c->sigcontext_addr != X86_64_SCF_NONE))
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    {
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      x86_64_sigreturn(cursor);
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      abort();
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0
    }
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  else
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    {
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      Debug (8, "resuming at ip=%llx via setcontext()\n",
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             (unsigned long long) c->dwarf.ip);
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      setcontext (uc);
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    }
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  return -UNW_EINVAL;
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0
}
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#endif /* !UNW_REMOTE_ONLY */
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/* This routine is responsible for copying the register values in
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   cursor C and establishing them as the current machine state. */
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static inline int
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establish_machine_state (struct cursor *c)
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0
{
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  int (*access_reg) (unw_addr_space_t, unw_regnum_t, unw_word_t *,
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                     int write, void *);
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  int (*access_fpreg) (unw_addr_space_t, unw_regnum_t, unw_fpreg_t *,
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                       int write, void *);
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  unw_addr_space_t as = c->dwarf.as;
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  void *arg = c->dwarf.as_arg;
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  unw_fpreg_t fpval;
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  unw_word_t val;
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  int reg;
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  access_reg = as->acc.access_reg;
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  access_fpreg = as->acc.access_fpreg;
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  Debug (8, "copying out cursor state\n");
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  for (reg = 0; reg <= UNW_REG_LAST; ++reg)
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    {
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      Debug (16, "copying %s %d\n", unw_regname (reg), reg);
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      if (unw_is_fpreg (reg))
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        {
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          if (tdep_access_fpreg (c, reg, &fpval, 0) >= 0)
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            (*access_fpreg) (as, reg, &fpval, 1, arg);
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        }
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      else
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        {
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          if (tdep_access_reg (c, reg, &val, 0) >= 0)
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            (*access_reg) (as, reg, &val, 1, arg);
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        }
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    }
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  if (c->dwarf.args_size)
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    {
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      if (tdep_access_reg (c, UNW_X86_64_RSP, &val, 0) >= 0)
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        {
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          val += c->dwarf.args_size;
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          (*access_reg) (as, UNW_X86_64_RSP, &val, 1, arg);
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        }
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    }
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  return 0;
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}
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int
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unw_resume (unw_cursor_t *cursor)
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{
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  struct cursor *c = (struct cursor *) cursor;
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  int ret;
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  Debug (1, "(cursor=%p)\n", c);
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  if ((ret = establish_machine_state (c)) < 0)
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    return ret;
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  return (*c->dwarf.as->acc.resume) (c->dwarf.as, (unw_cursor_t *) c,
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                                     c->dwarf.as_arg);
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0
}