[David Mosberger <davidm@hpl.hp.com>] problem with unwind info for .init/.fini sections

H . J . Lu hjl@lucon.org
Sat Mar 2 00:36:00 GMT 2002


On Fri, Mar 01, 2002 at 10:24:26AM -0800, David Mosberger wrote:
> >>>>> On Thu, 28 Feb 2002 22:57:57 -0800, Richard Henderson <rth@redhat.com> said:
> 
>   Richard> On Thu, Feb 28, 2002 at 10:41:51PM -0800, David Mosberger
>   Richard> wrote:
>   >> (I don't know what the ${RELOCATING+${INIT_ARRAY_START}} stuff
>   >> means in scripttempl/elf.sc; perhaps this does the right thing?)
> 
>   Richard> It's sh code.  If RELOCATING is set, then expand
>   Richard> INIT_ARRAY_START.  Which you havn't defined to anything, so
>   Richard> it's of course empty.
> 
>   Richard> You'd want to do something like
> 
>   Richard> 	INIT_ARRAY_START="PROVIDE(__init_array_start = .)"
>   Richard> ${RELOCATING+${CREATE_SHLIB-${INIT_ARRAY_START}}}
> 
> OK, so how about this patch?
> 
> With this version, the linker determines whether a DT_*_ARRAY is
> needed by search the input bfds for sections with the magic name.
> Is there a better way for doing such a check?
> 

.init_array, .fini_array and .preinit_array are new special sections.
We need to make sure their types and attributes are correct. Here is
a patch.


H.J.
----
2002-03-02  H.J. Lu <hjl@gnu.org>

	* elf.c (elf_fake_sections): Handle special sections,
	.init_array, .fini_array and .preinit_array.

	* elflink.h (NAME(bfd_elf,size_dynamic_sections)): Check the
	section types instead of names for .init_array, .fini_array and
	.preinit_array.

2002-03-02  H.J. Lu <hjl@gnu.org>

	* config/obj-elf.c (special_section): Add .init_array,
	.fini_array and .preinit_array.

	* config/tc-ia64.h (ELF_TC_SPECIAL_SECTIONS): Remove
	.init_array and .fini_array.

--- binutils/bfd/elf.c.array	Tue Feb 19 15:17:40 2002
+++ binutils/bfd/elf.c	Sat Mar  2 00:25:51 2002
@@ -2178,6 +2178,12 @@ elf_fake_sections (abfd, asect, failedpt
       this_hdr->sh_type = SHT_REL;
       this_hdr->sh_entsize = bed->s->sizeof_rel;
     }
+  else if (strcmp (asect->name, ".init_array") == 0)
+    this_hdr->sh_type = SHT_INIT_ARRAY;
+  else if (strcmp (asect->name, ".fini_array") == 0)
+    this_hdr->sh_type = SHT_FINI_ARRAY;
+  else if (strcmp (asect->name, ".preinit_array") == 0)
+    this_hdr->sh_type = SHT_PREINIT_ARRAY;
   else if (strncmp (asect->name, ".note", 5) == 0)
     this_hdr->sh_type = SHT_NOTE;
   else if (strncmp (asect->name, ".stab", 5) == 0
--- binutils/bfd/elflink.h.array	Fri Mar  1 23:44:22 2002
+++ binutils/bfd/elflink.h	Sat Mar  2 00:22:26 2002
@@ -3200,6 +3200,7 @@ NAME(bfd_elf,size_dynamic_sections) (out
   bfd *dynobj, *sub;
   asection *o;
   int need_preinit_array = 0, need_init_array = 0, need_fini_array = 0;
+  int initfini_array = 0;
   struct elf_backend_data *bed;
   struct elf_assign_sym_version_info asvinfo;
 
@@ -3370,18 +3371,27 @@ NAME(bfd_elf,size_dynamic_sections) (out
 	    return false;
 	}
 
-      for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
-	for (o = sub->sections; o != NULL; o = o->next)
-	  {
-	    /* yuck, more matching by name... */
-
-	    if (strcmp (bfd_section_name (sub, o), ".preinit_array") == 0)
+      for (sub = info->input_bfds; sub != NULL && initfini_array != 3;
+	   sub = sub->link_next)
+	for (o = sub->sections; o != NULL && initfini_array != 3;
+	     o = o->next)
+	  switch (elf_section_data (o->output_section)->this_hdr.sh_type)
+	    {
+	    case SHT_PREINIT_ARRAY:
 	      need_preinit_array = 1;
-	    if (strcmp (bfd_section_name (sub, o), ".init_array") == 0)
+	      initfini_array++;
+	      break;
+	    case SHT_INIT_ARRAY:
 	      need_init_array = 1;
-	    if (strcmp (bfd_section_name (sub, o), ".fini_array") == 0)
+	      initfini_array++;
+	      break;
+	    case SHT_FINI_ARRAY:
 	      need_fini_array = 1;
-	  }
+	      initfini_array++;
+	      break;
+	    default:
+	      break;
+	    }
       if (need_preinit_array)
 	{
 	  if (!elf_add_dynamic_entry (info, (bfd_vma) DT_PREINIT_ARRAY,
--- binutils/gas/config/obj-elf.c.array	Fri Mar  1 23:44:32 2002
+++ binutils/gas/config/obj-elf.c	Sat Mar  2 00:10:52 2002
@@ -595,6 +595,9 @@ static struct special_section const spec
   { ".rodata",	SHT_PROGBITS,	SHF_ALLOC			},
   { ".rodata1",	SHT_PROGBITS,	SHF_ALLOC			},
   { ".text",	SHT_PROGBITS,	SHF_ALLOC + SHF_EXECINSTR	},
+  { ".init_array",SHT_INIT_ARRAY, SHF_ALLOC + SHF_WRITE         }, 
+  { ".fini_array",SHT_FINI_ARRAY, SHF_ALLOC + SHF_WRITE         },
+  { ".preinit_array",SHT_PREINIT_ARRAY, SHF_ALLOC + SHF_WRITE   }, 
 
 #ifdef ELF_TC_SPECIAL_SECTIONS
   ELF_TC_SPECIAL_SECTIONS
--- binutils/gas/config/tc-ia64.h.array	Tue Jan 15 11:30:50 2002
+++ binutils/gas/config/tc-ia64.h	Sat Mar  2 00:10:52 2002
@@ -124,8 +124,6 @@ extern void ia64_after_parse_args PARAMS
 #define WORKING_DOT_WORD	/* don't do broken word processing for now */
 
 #define ELF_TC_SPECIAL_SECTIONS						   \
-{ ".init_array",SHT_INIT_ARRAY,	SHF_ALLOC + SHF_WRITE                   }, \
-{ ".fini_array",SHT_FINI_ARRAY,	SHF_ALLOC + SHF_WRITE                   }, \
 { ".sbss",	SHT_NOBITS,	SHF_ALLOC + SHF_WRITE + SHF_IA_64_SHORT }, \
 { ".sdata",	SHT_PROGBITS,	SHF_ALLOC + SHF_WRITE + SHF_IA_64_SHORT },
 



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