* ldlex.l, ldgram.y: Add ALIGNOF.

* ldexp.c (exp_print_token, foldname): Likewise.
	* ld.texinfo: Likewise.

	ld/testsuite/
	* ld-scripts/alignof.s: New.
	* ld-scripts/alignof.t: New
	* ld-scripts/alignof.exp: New.

ld/ChangeLog

@@ -1,3 +1,9 @@
+2007-06-18  Nathan Sidwell  <nathan@codesourcery.com>
+
+	* ldlex.l, ldgram.y: Add ALIGNOF.
+	* ldexp.c (exp_print_token, foldname): Likewise.
+	* ld.texinfo: Likewise.
+
 2007-06-18  Alan Modra  <amodra@bigpond.net.au>
 
 	* Makefile.am: Add eelf32_spu.o rule.

ld/ld.texinfo

@@ -4995,6 +4995,25 @@ of @code{ALIGN} is used to defines the value of a symbol.
 
 The builtin function @code{NEXT} is closely related to @code{ALIGN}.
 
+@item ALIGNOF(@var{section})
+@kindex ALIGNOF(@var{section})
+@cindex section alignment
+Return the alignment in bytes of the named @var{section}, if that section has
+been allocated.  If the section has not been allocated when this is
+evaluated, the linker will report an error. In the following example,
+the alignment of the @code{.output} section is stored as the first
+value in that section.
+@smallexample
+@group
+SECTIONS@{ @dots{}
+  .output @{
+    LONG (ALIGNOF (.output))
+    @dots{}
+    @}
+@dots{} @}
+@end group
+@end smallexample
+
 @item BLOCK(@var{exp})
 @kindex BLOCK(@var{exp})
 This is a synonym for @code{ALIGN}, for compatibility with older linker

ld/ldexp.c

@@ -97,6 +97,7 @@ exp_print_token (token_code_type code, int infix_p)
     { MAP, "MAP" },
     { ENTRY, "ENTRY" },
     { NEXT, "NEXT" },
+    { ALIGNOF, "ALIGNOF" },
     { SIZEOF, "SIZEOF" },
     { ADDR, "ADDR" },
     { LOADADDR, "LOADADDR" },
@@ -606,9 +607,9 @@ fold_name (etree_type *tree)
       break;
 
     case SIZEOF:
+    case ALIGNOF:
       if (expld.phase != lang_first_phase_enum)
 	{
-	  int opb = bfd_octets_per_byte (output_bfd);
 	  lang_output_section_statement_type *os;
 
 	  os = lang_output_section_find (tree->name.name);
@@ -620,7 +621,16 @@ fold_name (etree_type *tree)
 	      new_abs (0);
 	    }
 	  else if (os->processed_vma)
-	    new_abs (os->bfd_section->size / opb);
+	    {
+	      bfd_vma val;
+
+	      if (tree->type.node_code == SIZEOF)
+		val = os->bfd_section->size / bfd_octets_per_byte (output_bfd);
+	      else
+		val = (bfd_vma)1 << os->bfd_section->alignment_power;
+	      
+	      new_abs (val);
+	    }
 	}
       break;
 

ld/ldlex.l

@@ -254,6 +254,7 @@ V_IDENTIFIER [*?.$_a-zA-Z\[\]\-\!\^\\]([*?.$_a-zA-Z0-9\[\]\-\!\^\\]|::)*
 <EXPRESSION,BOTH,SCRIPT>"DATA_SEGMENT_END"	{ RTOKEN(DATA_SEGMENT_END);}
 <EXPRESSION,BOTH,SCRIPT>"ADDR"		{ RTOKEN(ADDR);}
 <EXPRESSION,BOTH,SCRIPT>"LOADADDR"	{ RTOKEN(LOADADDR);}
+<EXPRESSION,BOTH,SCRIPT>"ALIGNOF"	{ RTOKEN(ALIGNOF); }
 <EXPRESSION,BOTH>"MAX"			{ RTOKEN(MAX_K); }
 <EXPRESSION,BOTH>"MIN"			{ RTOKEN(MIN_K); }
 <EXPRESSION,BOTH,SCRIPT>"ASSERT"	{ RTOKEN(ASSERT_K); }

ld/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2007-06-18  Nathan Sidwell  <nathan@codesourcery.com>
+
+	* ld-scripts/alignof.s: New.
+	* ld-scripts/alignof.t: New
+	* ld-scripts/alignof.exp: New.
+
 2007-06-14  Alan Modra  <alan@grove.modra.org>
 
 	* ld-spu/ovl.d: Update.

ld/testsuite/ld-scripts/alignof.exp

@@ -0,0 +1,57 @@
+# Test ALIGNOF in a linker script.
+# By Nathan Sidwell <nathan@codesourcery.com>
+#
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
+
+set testname "ALIGNOF"
+
+if ![ld_assemble $as $srcdir/$subdir/alignof.s tmpdir/alignof.o] {
+    unresolved $testname
+    return
+}
+
+if ![ld_simple_link $ld tmpdir/alignof "-T $srcdir/$subdir/alignof.t tmpdir/alignof.o"] {
+    fail $testname
+    return
+}
+
+if ![ld_nm $nm "" tmpdir/alignof] {
+    unresolved $testname
+    return
+}
+
+if {![info exists nm_output(alignof_text)] \
+     || ![info exists nm_output(alignof_data)]} {
+    send_log "bad output from nm\n"
+    verbose "bad output from nm"
+    fail $testname
+    return
+}
+
+if {$nm_output(alignof_text) != 64} {
+    send_log "alignof_text != 64\n"
+    verbose "alignof_text != 64"
+    fail $testname
+    return
+}
+
+if {$nm_output(alignof_data) != 16} {
+    send_log "alignof_data != 16\n"
+    verbose "alignof_data != 16"
+    fail $testname
+    return
+}
+
+pass $testname

ld/testsuite/ld-scripts/alignof.s

@@ -0,0 +1,9 @@
+
+	.text
+	.p2align 6
+	.long 0
+
+	.data
+	.p2align 4
+	.long 0
+	

ld/testsuite/ld-scripts/alignof.t

@@ -0,0 +1,15 @@
+SECTIONS {
+	.text :
+	  {
+	    tmpdir/alignof.o (.text)
+	  }
+	.data : 
+	  { 
+	    tmpdir/alignof.o (.data)
+	    LONG (ALIGNOF(.text))
+	    LONG (ALIGNOF(.data))
+	  }
+}	
+
+alignof_text = ALIGNOF(.text);
+alignof_data = ALIGNOF(.data);