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-rw-r--r--bfd/coff-h8300.c53
1 files changed, 38 insertions, 15 deletions
diff --git a/bfd/coff-h8300.c b/bfd/coff-h8300.c
index 4aab46b..c83015e 100644
--- a/bfd/coff-h8300.c
+++ b/bfd/coff-h8300.c
@@ -4,21 +4,21 @@
Free Software Foundation, Inc.
Written by Steve Chamberlain, <sac@cygnus.com>.
-This file is part of BFD, the Binary File Descriptor library.
+ This file is part of BFD, the Binary File Descriptor library.
-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 2 of the License, or
-(at your option) any later version.
+ 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 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.
+ 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "bfd.h"
#include "sysdep.h"
@@ -483,6 +483,13 @@ h8300_reloc16_estimate (abfd, input_section, reloc, shrink, link_info)
closer if we do relax this branch. */
if ((int) gap >= -128 && (int) gap <= 128)
{
+ bfd_byte code;
+
+ if (!bfd_get_section_contents (abfd, input_section, & code,
+ reloc->address, 1))
+ break;
+ code = bfd_get_8 (abfd, & code);
+
/* It's possible we may be able to eliminate this branch entirely;
if the previous instruction is a branch around this instruction,
and there's no label at this instruction, then we can reverse
@@ -494,9 +501,25 @@ h8300_reloc16_estimate (abfd, input_section, reloc, shrink, link_info)
lab1: lab1:
This saves 4 bytes instead of two, and should be relatively
- common. */
-
- if (gap <= 126
+ common.
+
+ Only perform this optimisation for jumps (code 0x5a) not
+ subroutine calls, as otherwise it could transform:
+
+ mov.w r0,r0
+ beq .L1
+ jsr @_bar
+ .L1: rts
+ _bar: rts
+ into:
+ mov.w r0,r0
+ bne _bar
+ rts
+ _bar: rts
+
+ which changes the call (jsr) into a branch (bne). */
+ if (code == 0x5a
+ && gap <= 126
&& last_reloc
&& last_reloc->howto->type == R_PCRBYTE)
{