Properly convert objects between different ELF classes

The output SHF_COMPRESSED section size is different from input if
ELF classes of input and output aren't the same.  We must adjust
the section sizes as well as the compression headers in
SHF_COMPRESSED sections when converting objects between different
ELF classes.

bfd/

	 PR binutils/18656
	 * bfd.c (bfd_convert_section_size): New function.
	 (bfd_convert_section_contents): Likewise.
	 * bfd-in2.h: Regenerated.

binutils/

2015-07-10  H.J. Lu  <hongjiu.lu@intel.com>

	 PR binutils/18656
	 * objcopy.c (setup_section): Call bfd_convert_section_size
	 to get the output section size.
	 (copy_section): Get the section size from the output section
	 and call bfd_get_full_section_contents to convert section
	 contents for output.

binutils/testsuite/

	 PR binutils/18656
	 * binutils-all/compress.exp (convert_test): New proc.
	 Run conversion tests between x86-64 and x32.

4 files changed, 117 insertions, 2 deletions

diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index 09b0e1c6f72..c504b33cb80 100644
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,5 +1,14 @@
 2015-07-10  H.J. Lu  <hongjiu.lu@intel.com>
 
+	 PR binutils/18656
+	 * objcopy.c (setup_section): Call bfd_convert_section_size
+	 to get the output section size.
+	 (copy_section): Get the section size from the output section
+	 and call bfd_get_full_section_contents to convert section
+	 contents for output.
+
+2015-07-10  H.J. Lu  <hongjiu.lu@intel.com>
+
 	* readelf.c (dump_section_as_strings): Warn unsupported compress
 	type and corrupted compressed section.
 	(dump_section_as_bytes): Likewise.
diff --git a/binutils/objcopy.c b/binutils/objcopy.c
index 7f1bd76b5ea..d6516e02c7f 100644
--- a/binutils/objcopy.c
+++ b/binutils/objcopy.c
@@ -2872,6 +2872,7 @@ setup_section (bfd *ibfd, sec_ptr isection, void *obfdarg)
     elf_section_type (osection) = SHT_NOBITS;
 
   size = bfd_section_size (ibfd, isection);
+  size = bfd_convert_section_size (ibfd, isection, obfd, size);
   if (copy_byte >= 0)
     size = (size + interleave - 1) / interleave * copy_width;
   else if (extract_symbol)
@@ -3109,14 +3110,20 @@ copy_section (bfd *ibfd, sec_ptr isection, void *obfdarg)
     return;
 
   osection = isection->output_section;
-  size = bfd_get_section_size (isection);
+  /* The output SHF_COMPRESSED section size is different from input if
+     ELF classes of input and output aren't the same.  We must use the
+     output section size here, which has been updated in setup_section
+     via bfd_convert_section_size.  */
+  size = bfd_get_section_size (osection);
 
   if (bfd_get_section_flags (ibfd, isection) & SEC_HAS_CONTENTS
       && bfd_get_section_flags (obfd, osection) & SEC_HAS_CONTENTS)
     {
       bfd_byte *memhunk = NULL;
 
-      if (!bfd_get_full_section_contents (ibfd, isection, &memhunk))
+      if (!bfd_get_full_section_contents (ibfd, isection, &memhunk)
+	  || !bfd_convert_section_contents (ibfd, isection, obfd,
+					    &memhunk))
 	{
 	  status = 1;
 	  bfd_nonfatal_message (NULL, ibfd, isection, NULL);
diff --git a/binutils/testsuite/ChangeLog b/binutils/testsuite/ChangeLog
index ebc35c30df4..435961a8d26 100644
--- a/binutils/testsuite/ChangeLog
+++ b/binutils/testsuite/ChangeLog
@@ -1,5 +1,11 @@
 2015-07-10  H.J. Lu  <hongjiu.lu@intel.com>
 
+	 PR binutils/18656
+	 * binutils-all/compress.exp (convert_test): New proc.
+	 Run conversion tests between x86-64 and x32.
+
+2015-07-10  H.J. Lu  <hongjiu.lu@intel.com>
+
 	* binutils-all/dw2-3.W: Updated to accept .debug_* sections.
 
 2015-05-20  Ed Maste  <emaste@freebsd.org>
diff --git a/binutils/testsuite/binutils-all/compress.exp b/binutils/testsuite/binutils-all/compress.exp
index 43a3ce10bba..abff1973198 100644
--- a/binutils/testsuite/binutils-all/compress.exp
+++ b/binutils/testsuite/binutils-all/compress.exp
@@ -570,3 +570,96 @@ if { [regexp_diff objdump.out $srcdir/$subdir/dw2-3gabi.W] } then {
 } else {
     pass "$testname"
 }
+
+proc convert_test { testname  as_flags  objcop_flags } {
+    global srcdir
+    global subdir
+    global testfile3
+    global copyfile
+    global OBJCOPY
+    global OBJDUMP
+
+    if { ![binutils_assemble_flags $srcdir/$subdir/dw2-3.S ${testfile3}.o "$as_flags"] } then {
+       unresolved "$testname"
+       return
+    }
+
+    set got [binutils_run $OBJCOPY "$objcop_flags ${testfile3}.o ${copyfile}.o"]
+    if ![string match "" $got] then {
+	fail "objcopy ($testname)"
+	return
+    }
+
+    set got [remote_exec host "$OBJDUMP -W ${copyfile}.o" "" "/dev/null" "objdump.out"]
+
+    if { [lindex $got 0] != 0 || ![string match "" [lindex $got 1]] } then {
+	fail "$testname (reason: unexpected output)"
+	send_log $got
+	send_log "\n"
+	return
+    }
+
+    if { [regexp_diff objdump.out $srcdir/$subdir/dw2-3.W] } then {
+	fail "$testname"
+    } else {
+	pass "$testname"
+    }
+}
+
+if { ([istarget "x86_64-*-elf*"]
+       || [istarget "x86_64-*-linux*"]) } {
+    set testname "Convert x86-64 object with zlib-gabi to x32 (1)"
+    convert_test "$testname" "--compress-debug-sections=zlib-gabi --64" "-O elf32-x86-64"
+
+    set testname "Convert x86-64 object with zlib-gabi to x32 (2)"
+    convert_test "$testname" "--compress-debug-sections=zlib-gabi --64" "-O elf32-x86-64 --compress-debug-sections=zlib-gnu"
+
+    set testname "Convert x86-64 object with zlib-gabi to x32 (3)"
+    convert_test "$testname" "--compress-debug-sections=zlib-gabi --64" "-O elf32-x86-64 --decompress-debug-sections"
+
+    set testname "Convert x86-64 object with zlib-gnu to x32 (1)"
+    convert_test "$testname" "--compress-debug-sections=zlib-gnu --64" "-O elf32-x86-64"
+
+    set testname "Convert x86-64 object with zlib-gnu to x32 (2)"
+    convert_test "$testname" "--compress-debug-sections=zlib-gnu --64" "-O elf32-x86-64 --compress-debug-sections=zlib-gabi"
+
+    set testname "Convert x86-64 object with zlib-gnu to x32 (3)"
+    convert_test "$testname" "--compress-debug-sections=zlib-gnu --64" "-O elf32-x86-64 --decompress-debug-sections"
+
+    set testname "Convert x86-64 object to x32 (1)"
+    convert_test "$testname" "--nocompress-debug-sections --64" "-O elf32-x86-64"
+
+    set testname "Convert x86-64 object to x32 (2)"
+    convert_test "$testname" "--nocompress-debug-sections --64" "-O elf32-x86-64 --compress-debug-sections=zlib-gabi"
+
+    set testname "Convert x86-64 object to x32 (3)"
+    convert_test "$testname" "--nocompress-debug-sections --64" "-O elf32-x86-64 --compress-debug-sections=zlib-gnu"
+
+
+    set testname "Convert x32 object with zlib-gabi to x86-64 (1)"
+    convert_test "$testname" "--compress-debug-sections=zlib-gabi --x32" "-O elf64-x86-64"
+
+    set testname "Convert x32 object with zlib-gabi to x86-64 (2)"
+    convert_test "$testname" "--compress-debug-sections=zlib-gabi --x32" "-O elf64-x86-64 --compress-debug-sections=zlib-gnu"
+
+    set testname "Convert x32 object with zlib-gabi to x86-64 (3)"
+    convert_test "$testname" "--compress-debug-sections=zlib-gabi --x32" "-O elf64-x86-64 --decompress-debug-sections"
+
+    set testname "Convert x32 object with zlib-gnu to x86-64 (1)"
+    convert_test "$testname" "--compress-debug-sections=zlib-gnu --x32" "-O elf64-x86-64"
+
+    set testname "Convert x32 object with zlib-gnu to x86-64 (2)"
+    convert_test "$testname" "--compress-debug-sections=zlib-gnu --x32" "-O elf64-x86-64 --compress-debug-sections=zlib-gabi"
+
+    set testname "Convert x32 object with zlib-gnu to x86-64 (3)"
+    convert_test "$testname" "--compress-debug-sections=zlib-gnu --x32" "-O elf64-x86-64 --decompress-debug-sections"
+
+    set testname "Convert x32 object to x86-64 (1)"
+    convert_test "$testname" "--nocompress-debug-sections --x32" "-O elf64-x86-64"
+
+    set testname "Convert x32 object to x86-64 (2)"
+    convert_test "$testname" "--nocompress-debug-sections --x32" "-O elf64-x86-64 --compress-debug-sections=zlib-gabi"
+
+    set testname "Convert x32 object to x86-64 (3)"
+    convert_test "$testname" "--nocompress-debug-sections --x32" "-O elf64-x86-64 --compress-debug-sections=zlib-gnu"
+ }