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libgcc: Align __EH_FRAME_BEGIN__ to pointer size

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Aligne __EH_FRAME_BEGIN__ to pointer size since gcc/unwind-dw2-fde.h has

/* The first few fields of a CIE.  The CIE_id field is 0 for a CIE,
   to distinguish it from a valid FDE.  FDEs are aligned to an addressing
   unit boundary, but the fields within are unaligned.  */
struct dwarf_cie
{
  uword length;
  sword CIE_id;
  ubyte version;
  unsigned char augmentation[];
} __attribute__ ((packed, aligned (__alignof__ (void *))));

/* The first few fields of an FDE.  */
struct dwarf_fde
{
  uword length;
  sword CIE_delta;
  unsigned char pc_begin[];
} __attribute__ ((packed, aligned (__alignof__ (void *))));

which indicates that CIE/FDE should be aligned at the pointer size.

	PR libgcc/27576
	* crtstuff.c (__EH_FRAME_BEGIN__): Aligned to pointer size.
This commit is contained in:
H.J. Lu 2022-01-17 16:18:56 -08:00
parent c4c3cd5ca5
commit 2d546ff694
1 changed files with 2 additions and 1 deletions
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libgcc/crtstuff.c
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@ -261,7 +261,8 @@ STATIC func_ptr __DTOR_LIST__[1]
/* Stick a label at the beginning of the frame unwind info so we can register
and deregister it with the exception handling library code. */
STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[]
__attribute__((section(__LIBGCC_EH_FRAME_SECTION_NAME__), aligned(4)))
__attribute__((section(__LIBGCC_EH_FRAME_SECTION_NAME__),
aligned(__alignof__ (void *))))
= { };
#endif /* USE_EH_FRAME_REGISTRY */