unwind-ia64.c

Mac OS X 10.4.9 for x86 Source Code gcc 实现源代码

    {
      if (reg->where == UNW_WHERE_SPILL_HOME)
	{
	  reg->where = UNW_WHERE_PSPREL;
	  *offp -= regsize;
	  reg->val = *offp;
	}
    }
}

static inline void
spill_next_when (struct unw_reg_info **regp, struct unw_reg_info *lim,
		 unw_word t)
{
  struct unw_reg_info *reg;

  for (reg = *regp; reg <= lim; ++reg)
    {
      if (reg->where == UNW_WHERE_SPILL_HOME)
	{
	  reg->when = t;
	  *regp = reg + 1;
	  return;
	}
    }
  /* Excess spill.  */
  abort ();
}

static void
finish_prologue (struct unw_state_record *sr)
{
  struct unw_reg_info *reg;
  unsigned long off;
  int i;

  /* First, resolve implicit register save locations
     (see Section "11.4.2.3 Rules for Using Unwind Descriptors", rule 3).  */

  for (i = 0; i < (int) sizeof (save_order); ++i)
    {
      reg = sr->curr.reg + save_order[i];
      if (reg->where == UNW_WHERE_GR_SAVE)
	{
	  reg->where = UNW_WHERE_GR;
	  reg->val = sr->gr_save_loc++;
	}
    }

  /* Next, compute when the fp, general, and branch registers get saved.
     This must come before alloc_spill_area() because we need to know
     which registers are spilled to their home locations.  */
  if (sr->imask)
    {
      static unsigned char const limit[3] = {
	UNW_REG_F31, UNW_REG_R7, UNW_REG_B5
      };

      unsigned char kind, mask = 0, *cp = sr->imask;
      int t;
      struct unw_reg_info *(regs[3]);

      regs[0] = sr->curr.reg + UNW_REG_F2;
      regs[1] = sr->curr.reg + UNW_REG_R4;
      regs[2] = sr->curr.reg + UNW_REG_B1;

      for (t = 0; t < sr->region_len; ++t)
	{
	  if ((t & 3) == 0)
	    mask = *cp++;
	  kind = (mask >> 2*(3-(t & 3))) & 3;
	  if (kind > 0)
	    spill_next_when (&regs[kind - 1], sr->curr.reg + limit[kind - 1],
			     sr->region_start + t);
	}
    }

  /* Next, lay out the memory stack spill area.  */
  if (sr->any_spills)
    {
      off = sr->spill_offset;
      alloc_spill_area (&off, 16, sr->curr.reg + UNW_REG_F2,
		        sr->curr.reg + UNW_REG_F31); 
      alloc_spill_area (&off,  8, sr->curr.reg + UNW_REG_B1,
		        sr->curr.reg + UNW_REG_B5);
      alloc_spill_area (&off,  8, sr->curr.reg + UNW_REG_R4,
		        sr->curr.reg + UNW_REG_R7);
    }
}

/*
 * Region header descriptors.
 */

static void
desc_prologue (int body, unw_word rlen, unsigned char mask,
	       unsigned char grsave, struct unw_state_record *sr)
{
  int i;

  if (!(sr->in_body || sr->first_region))
    finish_prologue (sr);
  sr->first_region = 0;

  /* Check if we're done.  */
  if (sr->when_target < sr->region_start + sr->region_len) 
    {
      sr->done = 1;
      return;
    }

  for (i = 0; i < sr->epilogue_count; ++i)
    pop (sr);

  sr->epilogue_count = 0;
  sr->epilogue_start = UNW_WHEN_NEVER;

  if (!body)
    push (sr);

  sr->region_start += sr->region_len;
  sr->region_len = rlen;
  sr->in_body = body;

  if (!body)
    {
      for (i = 0; i < 4; ++i)
	{
	  if (mask & 0x8)
	    set_reg (sr->curr.reg + save_order[i], UNW_WHERE_GR,
		     sr->region_start + sr->region_len - 1, grsave++);
	  mask <<= 1;
	}
      sr->gr_save_loc = grsave;
      sr->any_spills = 0;
      sr->imask = 0;
      sr->spill_offset = 0x10;	/* default to psp+16 */
    }
}

/*
 * Prologue descriptors.
 */

static inline void
desc_abi (unsigned char abi,
	  unsigned char context,
	  struct unw_state_record *sr)
{
  sr->unwabi = (abi << 8) | context;
}

static inline void
desc_br_gr (unsigned char brmask, unsigned char gr,
	    struct unw_state_record *sr)
{
  int i;

  for (i = 0; i < 5; ++i)
    {
      if (brmask & 1)
	set_reg (sr->curr.reg + UNW_REG_B1 + i, UNW_WHERE_GR,
		 sr->region_start + sr->region_len - 1, gr++);
      brmask >>= 1;
    }
}

static inline void
desc_br_mem (unsigned char brmask, struct unw_state_record *sr)
{
  int i;

  for (i = 0; i < 5; ++i)
    {
      if (brmask & 1)
	{
	  set_reg (sr->curr.reg + UNW_REG_B1 + i, UNW_WHERE_SPILL_HOME,
		   sr->region_start + sr->region_len - 1, 0);
	  sr->any_spills = 1;
	}
      brmask >>= 1;
    }
}

static inline void
desc_frgr_mem (unsigned char grmask, unw_word frmask,
	       struct unw_state_record *sr)
{
  int i;

  for (i = 0; i < 4; ++i)
    {
      if ((grmask & 1) != 0)
	{
	  set_reg (sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_SPILL_HOME,
		   sr->region_start + sr->region_len - 1, 0);
	  sr->any_spills = 1;
	}
      grmask >>= 1;
    }
  for (i = 0; i < 20; ++i)
    {
      if ((frmask & 1) != 0)
	{
	  enum unw_register_index base = i < 4 ? UNW_REG_F2 : UNW_REG_F16 - 4;
	  set_reg (sr->curr.reg + base + i, UNW_WHERE_SPILL_HOME,
		   sr->region_start + sr->region_len - 1, 0);
	  sr->any_spills = 1;
	}
      frmask >>= 1;
    }
}

static inline void
desc_fr_mem (unsigned char frmask, struct unw_state_record *sr)
{
  int i;

  for (i = 0; i < 4; ++i)
    {
      if ((frmask & 1) != 0)
	{
	  set_reg (sr->curr.reg + UNW_REG_F2 + i, UNW_WHERE_SPILL_HOME,
		   sr->region_start + sr->region_len - 1, 0);
	  sr->any_spills = 1;
	}
      frmask >>= 1;
    }
}

static inline void
desc_gr_gr (unsigned char grmask, unsigned char gr,
	    struct unw_state_record *sr)
{
  int i;

  for (i = 0; i < 4; ++i)
    {
      if ((grmask & 1) != 0)
	set_reg (sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_GR,
		 sr->region_start + sr->region_len - 1, gr++);
      grmask >>= 1;
    }
}

static inline void
desc_gr_mem (unsigned char grmask, struct unw_state_record *sr)
{
  int i;

  for (i = 0; i < 4; ++i)
    {
      if ((grmask & 1) != 0)
	{
	  set_reg (sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_SPILL_HOME,
		   sr->region_start + sr->region_len - 1, 0);
	  sr->any_spills = 1;
	}
      grmask >>= 1;
    }
}

static inline void
desc_mem_stack_f (unw_word t, unw_word size, struct unw_state_record *sr)
{
  set_reg (sr->curr.reg + UNW_REG_PSP, UNW_WHERE_NONE,
	   sr->region_start + MIN ((int)t, sr->region_len - 1), 16*size);
}

static inline void
desc_mem_stack_v (unw_word t, struct unw_state_record *sr)
{
  sr->curr.reg[UNW_REG_PSP].when
    = sr->region_start + MIN ((int)t, sr->region_len - 1);
}

static inline void
desc_reg_gr (unsigned char reg, unsigned char dst, struct unw_state_record *sr)
{
  set_reg (sr->curr.reg + reg, UNW_WHERE_GR,
	   sr->region_start + sr->region_len - 1, dst);
}

static inline void
desc_reg_psprel (unsigned char reg, unw_word pspoff,
		 struct unw_state_record *sr)
{
  set_reg (sr->curr.reg + reg, UNW_WHERE_PSPREL,
	   sr->region_start + sr->region_len - 1,
	   0x10 - 4*pspoff);
}

static inline void
desc_reg_sprel (unsigned char reg, unw_word spoff, struct unw_state_record *sr)
{
  set_reg (sr->curr.reg + reg, UNW_WHERE_SPREL,
	   sr->region_start + sr->region_len - 1,
	   4*spoff);
}

static inline void
desc_rp_br (unsigned char dst, struct unw_state_record *sr)
{
  sr->return_link_reg = dst;
}

static inline void
desc_reg_when (unsigned char regnum, unw_word t, struct unw_state_record *sr)
{
  struct unw_reg_info *reg = sr->curr.reg + regnum;

  if (reg->where == UNW_WHERE_NONE)
    reg->where = UNW_WHERE_GR_SAVE;
  reg->when = sr->region_start + MIN ((int)t, sr->region_len - 1);
}

static inline void
desc_spill_base (unw_word pspoff, struct unw_state_record *sr)
{
  sr->spill_offset = 0x10 - 4*pspoff;
}

static inline unsigned char *
desc_spill_mask (unsigned char *imaskp, struct unw_state_record *sr)
{
  sr->imask = imaskp;
  return imaskp + (2*sr->region_len + 7)/8;
}

/*
 * Body descriptors.
 */
static inline void
desc_epilogue (unw_word t, unw_word ecount, struct unw_state_record *sr)
{
  sr->epilogue_start = sr->region_start + sr->region_len - 1 - t;
  sr->epilogue_count = ecount + 1;
}

static inline void
desc_copy_state (unw_word label, struct unw_state_record *sr)
{
  struct unw_labeled_state *ls;

  for (ls = sr->labeled_states; ls; ls = ls->next)
    {
      if (ls->label == label)
        {
	  free_state_stack (&sr->curr);
   	  memcpy (&sr->curr, &ls->saved_state, sizeof (sr->curr));
	  sr->curr.next = dup_state_stack (ls->saved_state.next);
	  return;
	}
    }
  abort ();
}

static inline void
desc_label_state (unw_word label, struct unw_state_record *sr)
{
  struct unw_labeled_state *ls = alloc_label_state ();

  ls->label = label;
  memcpy (&ls->saved_state, &sr->curr, sizeof (ls->saved_state));
  ls->saved_state.next = dup_state_stack (sr->curr.next);

  /* Insert into list of labeled states.  */
  ls->next = sr->labeled_states;
  sr->labeled_states = ls;
}

/*
 * General descriptors.
 */

static inline int
desc_is_active (unsigned char qp, unw_word t, struct unw_state_record *sr)
{
  if (sr->when_target <= sr->region_start + MIN ((int)t, sr->region_len - 1))
    return 0;
  if (qp > 0)
    {
      if ((sr->pr_val & (1UL << qp)) == 0) 
	return 0;
      sr->pr_mask |= (1UL << qp);
    }
  return 1;
}

static inline void
desc_restore_p (unsigned char qp, unw_word t, unsigned char abreg,
		struct unw_state_record *sr)
{
  struct unw_reg_info *r;

  if (! desc_is_active (qp, t, sr))
    return;

  r = sr->curr.reg + decode_abreg (abreg, 0);
  r->where = UNW_WHERE_NONE;
  r->when = sr->region_start + MIN ((int)t, sr->region_len - 1);
  r->val = 0;
}

static inline void
desc_spill_reg_p (unsigned char qp, unw_word t, unsigned char abreg,
		  unsigned char x, unsigned char ytreg,
		  struct unw_state_record *sr)
{
  enum unw_where where = UNW_WHERE_GR;
  struct unw_reg_info *r;

  if (! desc_is_active (qp, t, sr))
    return;

  if (x)
    where = UNW_WHERE_BR;
  else if (ytreg & 0x80)
    where = UNW_WHERE_FR;

  r = sr->curr.reg + decode_abreg (abreg, 0);
  r->where = where;
  r->when = sr->region_start + MIN ((int)t, sr->region_len - 1);
  r->val = ytreg & 0x7f;
}

static inline void
desc_spill_psprel_p (unsigned char qp, unw_word t, unsigned char abreg,
		     unw_word pspoff, struct unw_state_record *sr)
{
  struct unw_reg_info *r;

  if (! desc_is_active (qp, t, sr))
    return;

  r = sr->curr.reg + decode_abreg (abreg, 1);
  r->where = UNW_WHERE_PSPREL;
  r->when = sr->region_start + MIN((int)t, sr->region_len - 1);
  r->val = 0x10 - 4*pspoff;
}

static inline void
desc_spill_sprel_p (unsigned char qp, unw_word t, unsigned char abreg,
		    unw_word spoff, struct unw_state_record *sr)
{
  struct unw_reg_info *r;

  if (! desc_is_active (qp, t, sr))
    return;

  r = sr->curr.reg + decode_abreg (abreg, 1);
  r->where = UNW_WHERE_SPREL;
  r->when = sr->region_start + MIN ((int)t, sr->region_len - 1);
  r->val = 4*spoff;
}


#define UNW_DEC_BAD_CODE(code)			abort ();

/* Region headers.  */
#define UNW_DEC_PROLOGUE_GR(fmt,r,m,gr,arg)	desc_prologue(0,r,m,gr,arg)
#define UNW_DEC_PROLOGUE(fmt,b,r,arg)		desc_prologue(b,r,0,32,arg)

/* Prologue descriptors.  */
#define UNW_DEC_ABI(fmt,a,c,arg)		desc_abi(a,c,arg)
#define UNW_DEC_BR_GR(fmt,b,g,arg)		desc_br_gr(b,g,arg)
#define UNW_DEC_BR_MEM(fmt,b,arg)		desc_br_mem(b,arg)
#define UNW_DEC_FRGR_MEM(fmt,g,f,arg)		desc_frgr_mem(g,f,arg)
#define UNW_DEC_FR_MEM(fmt,f,arg)		desc_fr_mem(f,arg)
#define UNW_DEC_GR_GR(fmt,m,g,arg)		desc_gr_gr(m,g,arg)
#define UNW_DEC_GR_MEM(fmt,m,arg)		desc_gr_mem(m,arg)
#define UNW_DEC_MEM_STACK_F(fmt,t,s,arg)	desc_mem_stack_f(t,s,arg)
#define UNW_DEC_MEM_STACK_V(fmt,t,arg)		desc_mem_stack_v(t,arg)
#define UNW_DEC_REG_GR(fmt,r,d,arg)		desc_reg_gr(r,d,arg)
#define UNW_DEC_REG_PSPREL(fmt,r,o,arg)		desc_reg_psprel(r,o,arg)
#define UNW_DEC_REG_SPREL(fmt,r,o,arg)		desc_reg_sprel(r,o,arg)
#define UNW_DEC_REG_WHEN(fmt,r,t,arg)		desc_reg_when(r,t,arg)
#define UNW_DEC_PRIUNAT_WHEN_GR(fmt,t,arg)	desc_reg_when(UNW_REG_PRI_UNAT_GR,t,arg)
#define UNW_DEC_PRIUNAT_WHEN_MEM(fmt,t,arg)	desc_reg_when(UNW_REG_PRI_UNAT_MEM,t,arg)
#define UNW_DEC_PRIUNAT_GR(fmt,r,arg)		desc_reg_gr(UNW_REG_PRI_UNAT_GR,r,arg)
#define UNW_DEC_PRIUNAT_PSPREL(fmt,o,arg)	desc_reg_psprel(UNW_REG_PRI_UNAT_MEM,o,arg)
#define UNW_DEC_PRIUNAT_SPREL(fmt,o,arg)	desc_reg_sprel(UNW_REG_PRI_UNAT_MEM,o,arg)