[Bug gas/13104] New: ARM unified syntax: "b 0" with -mcpu=cortex-m3 crashes gas

[tmbinc at elitedvb dot net]

http://sourceware.org/bugzilla/show_bug.cgi?id=13104

             Bug #: 13104
           Summary: ARM unified syntax: "b 0" with -mcpu=cortex-m3 crashes
                    gas
           Product: binutils
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
        AssignedTo: address@hidden
        ReportedBy: address@hidden
    Classification: Unclassified


Created attachment 5901
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5901
repro assembly file

With ".syntax unified" and -mcpu=cortex-m3, a "b" with an immediate operand
crashes as.

$ cat crash.S
.syntax unified
b 0
$ arm-none-eabi-as  -mcpu=cortex-m3  crash.S
Segmentation fault

$ gdb --args arm-none-eabi-as  -mcpu=cortex-m3  crash.S
[...]
(gdb) bt
#0  S_IS_DEFINED (s=0x0) at ../../binutils-2.21/gas/symbols.c:2034
#1  0x0807e9c0 in relax_branch (fragp=0x81583d0, sec=0x0, bits=11, stretch=0)
at ../../binutils-2.21/gas/config/tc-arm.c:18917
#2  0x080829dc in arm_relax_frag (sec=0x8157678, fragp=0x81583d0, stretch=0) at
../../binutils-2.21/gas/config/tc-arm.c:18985
#3  0x0806a036 in relax_segment (segment_frag_root=0x81583d0,
segment=0x8157678, pass=0) at ../../binutils-2.21/gas/write.c:2653
#4  0x0806a34e in relax_seg (abfd=0x8142108, sec=0x0, xxx=0xbffff664) at
../../binutils-2.21/gas/write.c:542
#5  0x08096c2c in bfd_map_over_sections (abfd=0x8142108, operation=0x806a320
<relax_seg>, user_storage=0xbffff664) at ../../binutils-2.21/bfd/section.c:1251
#6  0x0806a4e8 in write_object_file () at ../../binutils-2.21/gas/write.c:1783
#7  0x0804c370 in main (argc=2, argv=0x81422d0) at
../../binutils-2.21/gas/as.c:1263

$ arm-none-eabi-as --version
GNU assembler (GNU Binutils) 2.21
Copyright 2010 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or later.
This program has absolutely no warranty.
This assembler was configured for a target of `arm-none-eabi'.

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