1  #include "libgcc_tm.h"
       2  
       3  /* This shim is special, it needs to be built for Mac OSX 10.6
       4     regardless of the current system version.
       5     We must also build it to use the unwinder layout that was
       6     present for 10.6 (and not update that).
       7     So we copy the referenced structures from unwind-dw2-fde.h
       8     to avoid pulling in newer system headers and/or changed
       9     layouts.  */
      10  struct dwarf_eh_bases
      11  {
      12    void *tbase;
      13    void *dbase;
      14    void *func;
      15  };
      16  
      17  typedef          int  sword __attribute__ ((mode (SI)));
      18  typedef unsigned int  uword __attribute__ ((mode (SI)));
      19  
      20  /* The first few fields of an FDE.  */
      21  struct dwarf_fde
      22  {
      23    uword length;
      24    sword CIE_delta;
      25    unsigned char pc_begin[];
      26  } __attribute__ ((packed, aligned (__alignof__ (void *))));
      27  
      28  typedef struct dwarf_fde fde;
      29  
      30  extern const fde * _Unwind_Find_FDE (void *, struct dwarf_eh_bases *);
      31  
      32  void *
      33  _darwin10_Unwind_FindEnclosingFunction (void *pc)
      34  {
      35    struct dwarf_eh_bases bases;
      36    const struct dwarf_fde *fde = _Unwind_Find_FDE (pc-1, &bases);
      37    if (fde)
      38      return bases.func;
      39    return (void *) 0;
      40  }