objcopy: Add --update-section option.

New option for objcopy --update-section allows the contents of a section
to be updated while maintaining the section flags, and, for ELF files,
the section to segment mapping.

New test uses --dump-section and --update-section to check that a
section can be made larger and smaller with an update.

binutils/ChangeLog:

	* objcopy.c (update_sections): New list.
	(command_line_switch): Add OPTION_UPDATE_SECTION.
	(copy_options): Add update-section.
	(copy_usage): Document new option.
	(is_update_section): New function.
	(is_strip_section_1): Add check for attempt to update and remove
	the same section.
	(copy_object): Update size and content of requested sections.
	(skip_section): Don't copy for updated sections.
	(copy_main): Handle --update-section.
	* doc/binutils.texi (objcopy): Add description of --update-section
	option.
	* NEWS: Mention --update-section option.

binutils/testsuite/ChangeLog:

	* binutils-all/update-1.s: New file.
	* binutils-all/update-2.s: New file.
	* binutils-all/update-3.s: New file.
	* binutils-all/update-4.s: New file.
	* binutils-all/update-section.exp: New file.

binutils/testsuite/ChangeLog

@@ -1,3 +1,11 @@
+2015-02-26  Andrew Burgess  <andrew.burgess@embecosm.com>
+
+	* binutils-all/update-1.s: New file.
+	* binutils-all/update-2.s: New file.
+	* binutils-all/update-3.s: New file.
+	* binutils-all/update-4.s: New file.
+	* binutils-all/update-section.exp: New file.
+
 2015-02-24  Nick Clifton  <nickc@redhat.com>
 
 	* binutils-all/objcopy.exp: Skip the strip-10 test for the V850.

binutils/testsuite/binutils-all/update-1.s

@@ -0,0 +1,2 @@
+        .section ".foo", "aw"
+        .word 1, 1, 1, 1

binutils/testsuite/binutils-all/update-2.s

@@ -0,0 +1,2 @@
+        .section ".foo", "aw"
+        .word 2, 2, 2, 2, 2, 2

binutils/testsuite/binutils-all/update-3.s

@@ -0,0 +1,3 @@
+        .section ".foo", "aw"
+        .word 3, 3
+

binutils/testsuite/binutils-all/update-4.s

@@ -0,0 +1,2 @@
+        .section ".bar", "aw"
+        .word 5

binutils/testsuite/binutils-all/update-section.exp

@@ -0,0 +1,114 @@
+# Copyright (C) 2015 Free Software Foundation, Inc.
+
+# This program 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 3 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.
+
+if { [is_remote host] } then {
+    return
+}
+
+send_user "Version [binutil_version $OBJCOPY]"
+
+proc do_assemble {srcfile} {
+    global srcdir
+    global subdir
+    set objfile [regsub -- "\.s$" $srcfile ".o"]
+    if {![binutils_assemble $srcdir/$subdir/${srcfile} tmpdir/${objfile}]} then {
+        return 0;
+    }
+    return 1;
+}
+
+proc do_objcopy {objfile extraflags {pattern ""}} {
+    global OBJCOPY
+    global OBJCOPYFLAGS
+
+    set testname "objcopy $extraflags ${objfile}"
+    set got [binutils_run $OBJCOPY \
+                 "$OBJCOPYFLAGS ${extraflags} tmpdir/${objfile}"]
+    if ![regexp $pattern $got] then {
+        fail "objcopy ($testname)"
+        return 0
+    }
+    if { $pattern != "" } then {
+        pass "objcopy ($testname)"
+    }
+    return 1
+}
+
+proc do_compare {file1 file2} {
+    set src1 "tmpdir/${file1}"
+    set src2 "tmpdir/${file2}"
+    set status [remote_exec build cmp "${src1} ${src2}"]
+    set exec_output [lindex $status 1]
+    set exec_output [prune_warnings $exec_output]
+
+    set testname "compare ${file1} ${file2}"
+    if [string match "" $exec_output] then {
+        pass "objcopy ($testname)"
+    } else {
+        send_log "$exec_output\n"
+        verbose "$exec_output" 1
+        fail "objcopy ($testname)"
+        return 0
+    }
+    return 1
+}
+
+#
+# Start Of Tests
+#
+
+foreach f [list update-1.s update-2.s update-3.s update-4.s] {
+    if { ![do_assemble $f] } then {
+        unsupported "update-section.exp"
+        return
+    }
+}
+
+if { ![do_objcopy update-1.o \
+           "--dump-section .foo=tmpdir/dumped-contents"]
+     || ![do_objcopy update-2.o \
+              "--update-section .foo=tmpdir/dumped-contents"]
+     || ![do_objcopy update-3.o \
+              "--update-section .foo=tmpdir/dumped-contents"]
+     || ![do_objcopy update-4.o \
+              "--update-section .bar=tmpdir/dumped-contents \
+               --rename-section .bar=.foo"] } then {
+    # If any of the above tests failed then a FAIL will already have
+    # been reported.
+    return
+}
+
+# Check that the updated object files are as expected.
+do_compare update-1.o update-2.o
+do_compare update-1.o update-3.o
+do_compare update-1.o update-4.o
+
+# Check that --update-section on an unknown section will fail.
+if { ![do_objcopy update-2.o \
+           "--update-section .bar=tmpdir/dumped-contents" \
+           "error: .bar not found, can't be updated"] } then {
+    return
+}
+
+# Check that --update-section and --remove-section on the same section
+# will fail.
+if { ![do_objcopy update-2.o \
+           "--update-section .foo=tmpdir/dumped-contents \
+            --remove-section .foo" \
+           "error: section .foo matches both update and remove options"] \
+     } then {
+    return
+}