* 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.

diff --git a/ld/ChangeLog b/ld/ChangeLog
index f39b9c7955bc21cbf159e918f5aefe90470d47cc..9d3b3ee29595b9e1f4bb2e5da564607d3ea536f2 100644 (file)
--- a/ld/ChangeLog
+++ b/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.

diff --git a/ld/ld.texinfo b/ld/ld.texinfo
index 84d03acd41b8683506b12e36f191407672cbe81b..71273f4e92c48d913b169d433b52d8a22f3c4283 100644 (file)
--- a/ld/ld.texinfo
+++ b/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

diff --git a/ld/ldexp.c b/ld/ldexp.c
index 43f96eaf5d8d00aaf3c7b996cd785983239a2f23..4f1d61d28deabdf67118b6c981595699f1818b9d 100644 (file)
--- a/ld/ldexp.c
+++ b/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;
 

diff --git a/ld/ldlex.l b/ld/ldlex.l
index 88a8f1d6556afec377fe68cda4f238b49dd7a8b0..b0313d9b17110fa46840e2258bc1184fb735a2b8 100644 (file)
--- a/ld/ldlex.l
+++ b/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); }

diff --git a/ld/testsuite/ChangeLog b/ld/testsuite/ChangeLog
index a97f3950f12d41d6a37490d8ac04db066920a25a..6030d0e9eab5e8e0c60c2619e137c72036b7b0ec 100644 (file)
--- a/ld/testsuite/ChangeLog
+++ b/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.

diff --git a/ld/testsuite/ld-scripts/alignof.exp b/ld/testsuite/ld-scripts/alignof.exp
new file mode 100644 (file)
index 0000000..7b812db
--- /dev/null
+++ b/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

diff --git a/ld/testsuite/ld-scripts/alignof.s b/ld/testsuite/ld-scripts/alignof.s
new file mode 100644 (file)
index 0000000..d440d2e
--- /dev/null
+++ b/ld/testsuite/ld-scripts/alignof.s
@@ -0,0 +1,9 @@
+
+       .text
+       .p2align 6
+       .long 0
+
+       .data
+       .p2align 4
+       .long 0
+       

diff --git a/ld/testsuite/ld-scripts/alignof.t b/ld/testsuite/ld-scripts/alignof.t
new file mode 100644 (file)
index 0000000..1241112
--- /dev/null
+++ b/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);