GDB 7.6.50

bfd/coffcode.h

Index: bfd/coffcode.h
diff --git a/bfd/coffcode.h b/bfd/coffcode.h
index 62eeb20d763011d1b8fd534173e03f99f7e02af5..542b5b7039d92deafaef390a4bf6239a96e3efb6 100644
--- a/bfd/coffcode.h
+++ b/bfd/coffcode.h
@@ -1,7 +1,5 @@
 /* Support for the generic parts of most COFF variants, for BFD.
-   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
-   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
-   Free Software Foundation, Inc.
+   Copyright 1990-2013 Free Software Foundation, Inc.
    Written by Cygnus Support.
 
    This file is part of BFD, the Binary File Descriptor library.
@@ -119,11 +117,11 @@ SUBSUBSECTION
 
 	The Microsoft PE variants of the Coff object file format add
 	an extension to support the use of long section names.  This
-	extension is defined in section 4 of the Microsoft PE/COFF 
+	extension is defined in section 4 of the Microsoft PE/COFF
 	specification (rev 8.1).  If a section name is too long to fit
 	into the section header's @code{s_name} field, it is instead
 	placed into the string table, and the @code{s_name} field is
-	filled with a slash ("/") followed by the ASCII decimal 
+	filled with a slash ("/") followed by the ASCII decimal
 	representation of the offset of the full name relative to the
 	string table base.
 
@@ -140,11 +138,11 @@ SUBSUBSECTION
 	expecting the MS standard format may become confused; @file{PEview} is
 	one known example.
 
-	The functionality is supported in BFD by code implemented under 
+	The functionality is supported in BFD by code implemented under
 	the control of the macro @code{COFF_LONG_SECTION_NAMES}.  If not
 	defined, the format does not support long section names in any way.
-	If defined, it is used to initialise a flag, 
-	@code{_bfd_coff_long_section_names}, and a hook function pointer, 
+	If defined, it is used to initialise a flag,
+	@code{_bfd_coff_long_section_names}, and a hook function pointer,
 	@code{_bfd_coff_set_long_section_names}, in the Coff backend data
 	structure.  The flag controls the generation of long section names
 	in output BFDs at runtime; if it is false, as it will be by default
@@ -153,7 +151,7 @@ SUBSUBSECTION
 	points to a function that allows the value of the flag to be altered
 	at runtime, on formats that support long section names at all; on
 	other formats it points to a stub that returns an error indication.
-	
+
 	With input BFDs, the flag is set according to whether any long section
 	names are detected while reading the section headers.  For a completely
 	new BFD, the flag is set to the default for the target format.  This
@@ -372,6 +370,7 @@ CODE_FRAGMENT
 #define STRING_SIZE_SIZE 4
 
 #define DOT_DEBUG	".debug"
+#define DOT_ZDEBUG	".zdebug"
 #define GNU_LINKONCE_WI ".gnu.linkonce.wi."
 #define GNU_LINKONCE_WT ".gnu.linkonce.wt."
 #define DOT_RELOC	".reloc"
@@ -545,7 +544,8 @@ sec_to_styp_flags (const char *sec_name, flagword sec_flags)
       styp_flags = STYP_LIT;
 #endif /* _LIT */
     }
-  else if (CONST_STRNEQ (sec_name, DOT_DEBUG))
+  else if (CONST_STRNEQ (sec_name, DOT_DEBUG)
+           || CONST_STRNEQ (sec_name, DOT_ZDEBUG))
     {
       /* Handle the XCOFF debug section and DWARF2 debug sections.  */
       if (!sec_name[6])
@@ -652,6 +652,7 @@ sec_to_styp_flags (const char *sec_name, flagword sec_flags)
   bfd_boolean is_dbg = FALSE;
 
   if (CONST_STRNEQ (sec_name, DOT_DEBUG)
+      || CONST_STRNEQ (sec_name, DOT_ZDEBUG)
 #ifdef COFF_LONG_SECTION_NAMES
       || CONST_STRNEQ (sec_name, GNU_LINKONCE_WI)
       || CONST_STRNEQ (sec_name, GNU_LINKONCE_WT)
@@ -704,7 +705,7 @@ sec_to_styp_flags (const char *sec_name, flagword sec_flags)
        & (SEC_LINK_DUPLICATES_DISCARD | SEC_LINK_DUPLICATES_SAME_CONTENTS
           | SEC_LINK_DUPLICATES_SAME_SIZE)) != 0)
     styp_flags |= IMAGE_SCN_LNK_COMDAT;
-  
+
   /* skip LINKER_CREATED */
 
   if ((sec_flags & SEC_COFF_NOREAD) == 0)
@@ -794,6 +795,12 @@ styp_to_sec_flags (bfd *abfd ATTRIBUTE_UNUSED,
   else if (styp_flags & STYP_PAD)
     sec_flags = 0;
 #ifdef RS6000COFF_C
+  else if (styp_flags & STYP_EXCEPT)
+    sec_flags |= SEC_LOAD;
+  else if (styp_flags & STYP_LOADER)
+    sec_flags |= SEC_LOAD;
+  else if (styp_flags & STYP_TYPCHK)
+    sec_flags |= SEC_LOAD;
   else if (styp_flags & STYP_DWARF)
     sec_flags |= SEC_DEBUGGING;
 #endif
@@ -821,6 +828,7 @@ styp_to_sec_flags (bfd *abfd ATTRIBUTE_UNUSED,
 	sec_flags |= SEC_ALLOC;
     }
   else if (CONST_STRNEQ (name, DOT_DEBUG)
+	   || CONST_STRNEQ (name, DOT_ZDEBUG)
 #ifdef _COMMENT
 	   || strcmp (name, _COMMENT) == 0
 #endif
@@ -1158,6 +1166,7 @@ styp_to_sec_flags (bfd *abfd,
   bfd_boolean is_dbg = FALSE;
 
   if (CONST_STRNEQ (name, DOT_DEBUG)
+      || CONST_STRNEQ (name, DOT_ZDEBUG)
 #ifdef COFF_LONG_SECTION_NAMES
       || CONST_STRNEQ (name, GNU_LINKONCE_WI)
       || CONST_STRNEQ (name, GNU_LINKONCE_WT)
@@ -1380,7 +1389,7 @@ Special entry points for gdb to swap in coff symbol table parts:
 .  bfd_boolean _bfd_coff_long_section_names;
 .  bfd_boolean (*_bfd_coff_set_long_section_names)
 .    (bfd *, int);
-.  
+.
 .  unsigned int _bfd_coff_default_section_alignment_power;
 .  bfd_boolean _bfd_coff_force_symnames_in_strings;
 .  unsigned int _bfd_coff_debug_string_prefix_length;
@@ -3354,36 +3363,38 @@ coff_compute_section_file_positions (bfd * abfd)
 	     padding the previous section up if necessary.  */
 	  old_sofar = sofar;
 
+	  sofar = BFD_ALIGN (sofar, 1 << current->alignment_power);
+
 #ifdef RS6000COFF_C
-	  /* AIX loader checks the text section alignment of (vma - filepos)
-	     So even though the filepos may be aligned wrt the o_algntext, for
-	     AIX executables, this check fails. This shows up when a native
-	     AIX executable is stripped with gnu strip because the default vma
-	     of native is 0x10000150 but default for gnu is 0x10000140.  Gnu
-	     stripped gnu excutable passes this check because the filepos is
-	     0x0140.  This problem also show up with 64 bit shared objects. The
-	     data section must also be aligned.  */
+	  /* Make sure the file offset and the vma of .text/.data are at the
+	     same page offset, so that the file can be mmap'ed without being
+	     relocated.  Failing that, AIX is able to load and execute the
+	     program, but it will be silently relocated (possible as
+	     executables are PIE).  But the relocation is slightly costly and
+	     complexify the use of addr2line or gdb.  So better to avoid it,
+	     like does the native linker.  Usually gnu ld makes sure that
+	     the vma of .text is the file offset so this issue shouldn't
+	     appear unless you are stripping such an executable.
+
+	     AIX loader checks the text section alignment of (vma - filepos),
+	     and the native linker doesn't try to align the text sections.
+	     For example:
+
+	     0 .text         000054cc  10000128  10000128  00000128  2**5
+                             CONTENTS, ALLOC, LOAD, CODE
+	  */
+
 	  if (!strcmp (current->name, _TEXT)
 	      || !strcmp (current->name, _DATA))
 	    {
-	      bfd_vma pad;
-	      bfd_vma align;
-
-	      sofar = BFD_ALIGN (sofar, 1 << current->alignment_power);
-
-	      align = 1 << current->alignment_power;
-	      pad = abs (current->vma - sofar) % align;
-
-	      if (pad)
-		{
-		  pad = align - pad;
-		  sofar += pad;
-		}
-	    }
-	  else
-#else
-	    {
-	      sofar = BFD_ALIGN (sofar, 1 << current->alignment_power);
+	      bfd_vma align = 4096;
+	      bfd_vma sofar_off = sofar % align;
+	      bfd_vma vma_off = current->vma % align;
+
+	      if (vma_off > sofar_off)
+		sofar += vma_off - sofar_off;
+	      else if (vma_off < sofar_off)
+		sofar += align + vma_off - sofar_off;
 	    }
 #endif
 	  if (previous != NULL)
@@ -3442,7 +3453,7 @@ coff_compute_section_file_positions (bfd * abfd)
 	 incremented in coff_set_section_contents.  This is right for
 	 SVR3.2.  */
       if (strcmp (current->name, _LIB) == 0)
-	bfd_set_section_vma (abfd, current, 0);
+	(void) bfd_set_section_vma (abfd, current, 0);
 #endif
 
 #ifdef ALIGN_SECTIONS_IN_FILE
@@ -3944,7 +3955,7 @@ coff_write_object_contents (bfd * abfd)
 	  bfd_size_type amt;
 
 	  internal_f.f_nscns++;
-	  strncpy (&(scnhdr.s_name[0]), current->name, 8);
+	  memcpy (scnhdr.s_name, ".ovrflo", 8);
 	  scnhdr.s_paddr = current->reloc_count;
 	  scnhdr.s_vaddr = current->lineno_count;
 	  scnhdr.s_size = 0;