[Bug gas/10387] New: branch instruction with no operand causes gas to segfault on arm-linux-gnueabi

[doko at debian dot org]

[forwarded from https://launchpad.net/bugs/396049]

Seen with 2.19.51.20090713, not 2.19.1-0ubuntu3:

An input file consisting of a single "b" character (with or without newline) is
sufficient to reproduce the error. However, "beq" also works.

I haven't been able to determine whether the parsing of any other instructions
is affected; "mov" with no operands causes gas to generate an error message
normally, for example.

Program received signal SIGSEGV, Segmentation fault.
symbol_get_tc (s=0x0) at ../../gas/symbols.c:2699
2699      if (LOCAL_SYMBOL_CHECK (s))
(gdb) bt
#0  symbol_get_tc (s=0x0) at ../../gas/symbols.c:2699
#1  0x0003d624 in arm_force_relocation (fixp=0x8f410) at
../../gas/config/tc-arm.c:20811
#2  0x0003da1c in md_pcrel_from_section (fixP=0x8f410, seg=0xa26a0) at
../../gas/config/tc-arm.c:18871
#3  0x0002c498 in fix_segment (abfd=<value optimized out>, sec=0xa26a0,
xxx=<value optimized out>)
    at ../../gas/write.c:1011
#4  0x40067108 in bfd_map_over_sections (abfd=0x8d130, operation=0x2c26c
<fix_segment>, 
    user_storage=0x0) at ../../bfd/section.c:1232
#5  0x0002b90c in write_object_file () at ../../gas/write.c:1735
#6  0x0000cec8 in main (argc=578264, argv=0xbe9c3814) at ../../gas/as.c:1232


Related to?

2009-05-05 Ramana Radhakrishnan  <address@hidden>

        * config/tc-arm.h: Fix typo in comment.
        (ARM_IS_FUNC): New macro.
        (MD_APPLY_SYM_VALUE): Define.

        * config/tc-arm.c (do_blx): Retain BFD_RELOC_ARM_PCREL_BLX for
        all versions of EABI.
        (relax_branch): Do not relax for branches to ARM functions.
        (md_pcrel_from_section): Set up base correctly for
        BFD_RELOC_THUMB_PCREL_BLX, BFD_RELOC_THUMB_PCREL_CALL,
        BFD_RELOC_THUMB_PCREL_BRANCH23, BFD_RELOC_ARM_PCREL_BLX
        BFD_RELOC_ARM_PCREL_CALL.
        (md_apply_fix): Flip bl to blx where possible.
        Flip blx to bl where possible.
        (arm_force_relocation): Force relocations for
        BFD_RELOC_ARM_PCREL_JUMP, BFD_RELOC_ARM_PCREL_JUMP,
        BFD_RELOC_ARM_PCREL_BLX, BFD_RELOC_THUMB_PCREL_BLX,
        BFD_RELOC_THUMB_PCREL_BRANCH20, BFD_RELOC_THUMB_PCREL_BRANCH23,
        BFD_RELOC_THUMB_PCREL_BRANCH25.
        (arm_apply_sym_value): New function.

-- 
           Summary: branch instruction with no operand causes gas to
                    segfault on arm-linux-gnueabi
           Product: binutils
           Version: 2.20 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
        AssignedTo: unassigned at sources dot redhat dot com
        ReportedBy: doko at debian dot org
                CC: bug-binutils at gnu dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=10387

------- You are receiving this mail because: -------
You are on the CC list for the bug, or are watching someone who is.