libunwind-eh_elf/src/ia64/unw_init_local.c

/* libunwind - a platform-independent unwind library
   Copyright (C) 2001-2002 Hewlett-Packard Co
	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>

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 <string.h>
#include <stdlib.h>

#include "init.h"
#include "rse.h"
#include "unwind_i.h"

#ifdef UNW_REMOTE_ONLY

int
unw_init_local (unw_cursor_t *cursor, ucontext_t *uc)
{
  return -UNW_EINVAL;
}

#else /* !UNW_REMOTE_ONLY */

static inline void *
uc_addr (ucontext_t *uc, int reg)
{
  void *addr;

  switch (reg)
    {
    case UNW_IA64_IP:		addr = &uc->uc_mcontext.sc_br[0]; break;
    case UNW_IA64_CFM:		addr = &uc->uc_mcontext.sc_ar_pfs; break;
    case UNW_IA64_AR_RNAT:	addr = &uc->uc_mcontext.sc_ar_rnat; break;
    case UNW_IA64_AR_UNAT:	addr = &uc->uc_mcontext.sc_ar_unat; break;
    case UNW_IA64_AR_LC:	addr = &uc->uc_mcontext.sc_ar_lc; break;
    case UNW_IA64_AR_FPSR:	addr = &uc->uc_mcontext.sc_ar_fpsr; break;
    case UNW_IA64_PR:		addr = &uc->uc_mcontext.sc_pr; break;
    case UNW_IA64_AR_BSP:	addr = &uc->uc_mcontext.sc_rbs_base; break;
    case UNW_IA64_AR_BSPSTORE:	addr = &uc->uc_mcontext.sc_rbs_base; break;

    case UNW_IA64_GR + 4 ... UNW_IA64_GR + 7:
    case UNW_IA64_GR + 12:
      addr = &uc->uc_mcontext.sc_gr[reg - UNW_IA64_GR];
      break;

    case UNW_IA64_BR + 1 ... UNW_IA64_BR + 5:
      addr = &uc->uc_mcontext.sc_br[reg - UNW_IA64_BR];
      break;

    case UNW_IA64_FR+ 2 ... UNW_IA64_FR+ 5:
    case UNW_IA64_FR+16 ... UNW_IA64_FR+31:
      addr = &uc->uc_mcontext.sc_fr[reg - UNW_IA64_FR];
      break;

    default:
      addr = NULL;
    }
  return addr;
}

#ifdef UNW_LOCAL_ONLY

void *
_Uia64_uc_addr (ucontext_t *uc, int reg)
{
  return uc_addr (uc, reg);
}

#else /* !UNW_LOCAL_ONLY */

static int
access_mem (unw_word_t addr, unw_word_t *val, int write, void *arg)
{
  if (write)
    {
      debug (100, "%s: mem[%lx] <- %lx\n", __FUNCTION__, addr, *val);
      *(unw_word_t *) addr = *val;
    }
  else
    {
      *val = *(unw_word_t *) addr;
      debug (100, "%s: mem[%lx] -> %lx\n", __FUNCTION__, addr, *val);
    }
  return 0;
}

static int
access_reg (unw_regnum_t reg, unw_word_t *val, int write, void *arg)
{
  unw_word_t *addr, mask;
  ucontext_t *uc = arg;

  if (reg >= UNW_IA64_FR && reg < UNW_IA64_FR + 128)
    goto badreg;

  if (reg >= UNW_IA64_NAT + 4 && reg <= UNW_IA64_NAT + 7)
    {
      mask = ((unw_word_t) 1) << (reg - UNW_IA64_NAT);
      if (write)
	{
	  if (*val)
	    uc->uc_mcontext.sc_nat |= mask;
	  else
	    uc->uc_mcontext.sc_nat &= ~mask;
	}
      else
	*val = (uc->uc_mcontext.sc_nat & mask) != 0;

      if (write)
	debug (100, "%s: %s <- %lx\n", __FUNCTION__, unw_regname (reg), *val);
      else
	debug (100, "%s: %s -> %lx\n", __FUNCTION__, unw_regname (reg), *val);
      return 0;
    }

  addr = uc_addr (uc, reg);
  if (!addr)
    goto badreg;

  if (write)
    {
      *(unw_word_t *) addr = *val;
      debug (100, "%s: %s <- %lx\n", __FUNCTION__, unw_regname (reg), *val);
    }
  else
    {
      *val = *(unw_word_t *) addr;
      debug (100, "%s: %s -> %lx\n", __FUNCTION__, unw_regname (reg), *val);
    }
  return 0;

 badreg:
  debug (1, "%s: bad register number %u\n", __FUNCTION__, reg);
  return -UNW_EBADREG;
}

static int
access_fpreg (unw_regnum_t reg, unw_fpreg_t *val, int write, void *arg)
{
  ucontext_t *uc = arg;
  unw_fpreg_t *addr;

  if (reg < UNW_IA64_FR || reg >= UNW_IA64_FR + 128)
    goto badreg;

  addr = uc_addr (uc, reg);
  if (!addr)
    goto badreg;

  if (write)
    {
      debug (100, "%s: %s <- %016lx.%016lx\n", __FUNCTION__,
	     unw_regname (reg), val->raw.bits[1], val->raw.bits[0]);
      *(unw_fpreg_t *) addr = *val;
    }
  else
    {
      *val = *(unw_fpreg_t *) addr;
      debug (100, "%s: %s -> %016lx.%016lx\n", __FUNCTION__,
	     unw_regname (reg), val->raw.bits[1], val->raw.bits[0]);
    }
  return 0;

 badreg:
  debug (1, "%s: bad register number %u\n", __FUNCTION__, reg);
  /* attempt to access a non-preserved register */
  return -UNW_EBADREG;
}

#endif /* !UNW_LOCAL_ONLY */

int
ia64_local_resume (unw_cursor_t *cursor, void *arg)
{
  struct ia64_cursor *c = (struct ia64_cursor *) cursor;
  unw_fpreg_t fpval;
  ucontext_t *uc = arg;
  unw_word_t val, sol;
  int i, ret;
# define SET_NAT(n)						\
  do								\
    {								\
      ret = ia64_access_reg (c, UNW_IA64_NAT + (n), &val, 0);	\
      if (ret < 0)						\
	return ret;						\
      if (val)							\
	uc->uc_mcontext.sc_nat |= (unw_word_t) 1 << n;		\
    }								\
  while (0)
# define SET_REG(f, r)				\
  do						\
    {						\
      ret = ia64_get (c, c->r, &val);		\
      if (ret < 0)				\
	return ret;				\
      uc->uc_mcontext.f = val;			\
    }						\
  while (0)
# define SET_FPREG(f, r)				\
  do							\
    {							\
      ret = ia64_getfp (c, c->r, &fpval);		\
      if (ret < 0)					\
	return ret;					\
      uc->uc_mcontext.f.u.bits[0] = fpval.raw.bits[0];	\
      uc->uc_mcontext.f.u.bits[1] = fpval.raw.bits[1];	\
    }							\
  while (0)

  SET_REG (sc_ar_pfs, pfs_loc);
  SET_REG (sc_br[0], ip_loc);
  SET_REG (sc_pr, pr_loc);
  SET_REG (sc_ar_rnat, rnat_loc);
  SET_REG (sc_ar_lc, lc_loc);
  SET_REG (sc_ar_fpsr, fpsr_loc);

  SET_REG (sc_gr[4], r4_loc); SET_REG(sc_gr[5], r5_loc);
  SET_REG (sc_gr[6], r6_loc); SET_REG(sc_gr[7], r7_loc);
  uc->uc_mcontext.sc_nat = 0;
  SET_NAT (4); SET_NAT(5);
  SET_NAT (6); SET_NAT(7);

  SET_REG (sc_br[1], b1_loc);
  SET_REG (sc_br[2], b2_loc);
  SET_REG (sc_br[3], b3_loc);
  SET_REG (sc_br[4], b4_loc);
  SET_REG (sc_br[5], b5_loc);
  SET_FPREG (sc_fr[2], f2_loc);
  SET_FPREG (sc_fr[3], f3_loc);
  SET_FPREG (sc_fr[4], f4_loc);
  SET_FPREG (sc_fr[5], f5_loc);
  for (i = 16; i < 32; ++i)
    SET_FPREG (sc_fr[i], fr_loc[i - 16]);

  if ((c->pi.flags & IA64_FLAG_SIGTRAMP) != 0)
    abort ();	/* XXX this needs to be fixed... */

  /* Account for the fact that __ia64_install_context() returns via
     br.ret, which will decrement bsp by size-of-locals.  */
  sol = (uc->uc_mcontext.sc_ar_pfs >> 7) & 0x7f;
  uc->uc_mcontext.sc_ar_bsp = ia64_rse_skip_regs (c->bsp, sol);

  uc->uc_mcontext.sc_flags = 0;
  uc->uc_mcontext.sc_gr[1] = c->pi.gp;
  uc->uc_mcontext.sc_gr[12] = c->psp;

  __ia64_install_context (uc, c->eh_args[0], c->eh_args[1], c->eh_args[2],
			  c->eh_args[3]);
}

int
unw_init_local (unw_cursor_t *cursor, ucontext_t *uc)
{
  struct ia64_cursor *c = (struct ia64_cursor *) cursor;
  unw_word_t sol;
  int ret;
  STAT(unsigned long start, flags; ++unw.stat.api.inits;
       start = ia64_get_itc ();)

  if (unw.first_time)
    {
      unw.first_time = 0;
      ia64_init ();
    }

  /* The bsp value stored by getcontext() points to the *end* of the
     register frame of the initial function.  We correct for this by
     storing the adjusted value in sc_rbs_base, which isn't used by
     getcontext()/setcontext().  */
  sol = (uc->uc_mcontext.sc_ar_pfs >> 7) & 0x7f;
  uc->uc_mcontext.sc_rbs_base = ia64_rse_skip_regs (uc->uc_mcontext.sc_ar_bsp,
						    -sol);

#ifdef UNW_LOCAL_ONLY
  c->uc = uc;
#else /* !UNW_LOCAL_ONLY */
  c->acc.arg = uc;
  c->acc.acquire_unwind_info = _Uia64_glibc_acquire_unwind_info;
  c->acc.release_unwind_info = _Uia64_glibc_release_unwind_info;
  c->acc.access_mem = access_mem;
  c->acc.access_reg = access_reg;
  c->acc.access_fpreg = access_fpreg;
  c->acc.resume = ia64_local_resume;
#endif /* !UNW_LOCAL_ONLY */
  ret = common_init (c);
  STAT(unw.stat.api.init_time += ia64_get_itc() - start;)
  return ret;
}

#endif /* !UNW_REMOTE_ONLY */