[vms/committed] Create an absolute section if needed

[Tristan Gingold <gingold at adacore dot com>]

Hi,

unlike most other object formats, absolute section must be explicitly declared.  This patch makes sure
that an absolute section exists if one is referenced.

Tristan.

bfd/
2010-06-25  Tristan Gingold  <gingold@adacore.com>

	* vms-alpha.c (_bfd_vms_write_egsd): Check absolute section with
	its flags.  Create an absolute section if needed.


Index: vms-alpha.c
===================================================================
RCS file: /cvs/src/src/bfd/vms-alpha.c,v
retrieving revision 1.27
diff -c -r1.27 vms-alpha.c
*** vms-alpha.c	25 Jun 2010 15:21:48 -0000	1.27
--- vms-alpha.c	25 Jun 2010 15:35:27 -0000
***************
*** 3281,3287 ****
    unsigned int symnum;
    const char *sname;
    flagword new_flags, old_flags;
!   int abs_section_index = 0;
    unsigned int target_index = 0;
    struct vms_rec_wr *recwr = &PRIV (recwr);
  
--- 3281,3287 ----
    unsigned int symnum;
    const char *sname;
    flagword new_flags, old_flags;
!   int abs_section_index = -1;
    unsigned int target_index = 0;
    struct vms_rec_wr *recwr = &PRIV (recwr);
  
***************
*** 3344,3353 ****
  	  else if ((*sname == 'l') && (strcmp (sname, "literal") == 0))
  	    sname = EVAX_LITERAL_NAME;
  	  else if ((*sname == 'l') && (strcmp (sname, "literals") == 0))
! 	    {
! 	      sname = EVAX_LITERALS_NAME;
! 	      abs_section_index = section->target_index;
! 	    }
  	  else if ((*sname == 'c') && (strcmp (sname, "comm") == 0))
  	    sname = EVAX_COMMON_NAME;
  	  else if ((*sname == 'l') && (strcmp (sname, "lcomm") == 0))
--- 3344,3350 ----
  	  else if ((*sname == 'l') && (strcmp (sname, "literal") == 0))
  	    sname = EVAX_LITERAL_NAME;
  	  else if ((*sname == 'l') && (strcmp (sname, "literals") == 0))
!             sname = EVAX_LITERALS_NAME;
  	  else if ((*sname == 'c') && (strcmp (sname, "comm") == 0))
  	    sname = EVAX_COMMON_NAME;
  	  else if ((*sname == 'l') && (strcmp (sname, "lcomm") == 0))
***************
*** 3356,3364 ****
        else
  	sname = _bfd_vms_length_hash_symbol (abfd, sname, EOBJ__C_SECSIZ);
  
-       _bfd_vms_output_begin_subrec (recwr, EGSD__C_PSC);
-       _bfd_vms_output_short (recwr, section->alignment_power & 0xff);
- 
        if (bfd_is_com_section (section))
  	new_flags = (EGPS__V_OVR | EGPS__V_REL | EGPS__V_GBL | EGPS__V_RD
  		     | EGPS__V_WRT | EGPS__V_NOMOD | EGPS__V_COM);
--- 3353,3358 ----
***************
*** 3377,3386 ****
--- 3371,3387 ----
        vms_debug2 ((3, "new_flags %x, _raw_size %lu\n",
                     new_flags, (unsigned long)section->size));
  
+       _bfd_vms_output_begin_subrec (recwr, EGSD__C_PSC);
+       _bfd_vms_output_short (recwr, section->alignment_power & 0xff);
        _bfd_vms_output_short (recwr, new_flags);
        _bfd_vms_output_long (recwr, (unsigned long) section->size);
        _bfd_vms_output_counted (recwr, sname);
        _bfd_vms_output_end_subrec (recwr);
+ 
+       /* If the section is an obsolute one, remind its index as it will be
+          used later for absolute symbols.  */
+       if ((new_flags & EGPS__V_REL) == 0 && abs_section_index < 0)
+         abs_section_index = section->target_index;
      }
  
    /* Output symbols.  */
***************
*** 3395,3401 ****
        symbol = abfd->outsymbols[symnum];
        old_flags = symbol->flags;
  
!       /* Work-around a missing feature:  consider __main as the main entry point.  */
        if (*(symbol->name) == '_')
  	{
  	  if (strcmp (symbol->name, "__main") == 0)
--- 3396,3403 ----
        symbol = abfd->outsymbols[symnum];
        old_flags = symbol->flags;
  
!       /* Work-around a missing feature:  consider __main as the main entry
!          point.  */
        if (*(symbol->name) == '_')
  	{
  	  if (strcmp (symbol->name, "__main") == 0)
***************
*** 3416,3429 ****
              continue;
          }
  
!       /* 13 bytes egsd, max 64 chars name -> should be 77 bytes.  */
!       if (_bfd_vms_output_check (recwr, 80) < 0)
  	{
  	  _bfd_vms_output_end (abfd, recwr);
  	  _bfd_vms_output_begin (recwr, EOBJ__C_EGSD);
  	  _bfd_vms_output_long (recwr, 0);
  	}
  
        _bfd_vms_output_begin_subrec (recwr, EGSD__C_SYM);
  
        /* Data type, alignment.  */
--- 3418,3449 ----
              continue;
          }
  
!       /* 13 bytes egsd, max 64 chars name -> should be 77 bytes.  Add 16 more
!          bytes for a possible ABS section.  */
!       if (_bfd_vms_output_check (recwr, 80 + 16) < 0)
  	{
  	  _bfd_vms_output_end (abfd, recwr);
  	  _bfd_vms_output_begin (recwr, EOBJ__C_EGSD);
  	  _bfd_vms_output_long (recwr, 0);
  	}
  
+       if ((old_flags & BSF_GLOBAL) != 0
+           && bfd_is_abs_section (symbol->section)
+           && abs_section_index <= 0)
+         {
+           /* Create an absolute section if none was defined.  It is highly
+              unlikely that the name $ABS$ clashes with a user defined
+              non-absolute section name.  */
+           _bfd_vms_output_begin_subrec (recwr, EGSD__C_PSC);
+           _bfd_vms_output_short (recwr, 4);
+           _bfd_vms_output_short (recwr, EGPS__V_SHR);
+           _bfd_vms_output_long (recwr, 0);
+           _bfd_vms_output_counted (recwr, "$ABS$");
+           _bfd_vms_output_end_subrec (recwr);
+ 
+           abs_section_index = target_index++;
+         }
+ 
        _bfd_vms_output_begin_subrec (recwr, EGSD__C_SYM);
  
        /* Data type, alignment.  */