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Re: gdb segv in arm disassembler


Hi Daniel,

On Mon, Jan 25, 2010 at 06:22:55PM -0800, Doug Evans wrote:
I'm getting a segv in the arm disassembler when invoked from gdb,

Yes.  Sorry - I have a patch for this but I have got stuck travelling
instead of finishing the patch series it's part of.

I think this is the appropriate fix:
-  int           is_data = (bfd_asymbol_flavour (*info->symtab)
-			   == bfd_target_elf_flavour) ? TRUE : FALSE;
+  int           is_data = FALSE;

Unfortunately this introduces a new failure into the GAS testsuite.


How about this version instead ?

Cheers
  Nick

Index: opcodes/arm-dis.c
===================================================================
RCS file: /cvs/src/src/opcodes/arm-dis.c,v
retrieving revision 1.122
diff -c -3 -p -r1.122 arm-dis.c
*** opcodes/arm-dis.c	20 Jan 2010 10:54:03 -0000	1.122
--- opcodes/arm-dis.c	28 Jan 2010 12:46:17 -0000
*************** print_insn (bfd_vma pc, struct disassemb
*** 4355,4367 ****
    long		given;
    int           status;
    int           is_thumb = FALSE;
!   int           is_data = (bfd_asymbol_flavour (*info->symtab)
! 			   == bfd_target_elf_flavour) ? TRUE : FALSE;
    int           little_code;
    unsigned int	size = 4;
    void	 	(*printer) (bfd_vma, struct disassemble_info *, long);
    bfd_boolean   found = FALSE;

    if (info->disassembler_options)
      {
        parse_disassembler_options (info->disassembler_options);
--- 4355,4373 ----
    long		given;
    int           status;
    int           is_thumb = FALSE;
!   int           is_data = FALSE;
    int           little_code;
    unsigned int	size = 4;
    void	 	(*printer) (bfd_vma, struct disassemble_info *, long);
    bfd_boolean   found = FALSE;

+   /* On ELF based systems we use special mapping symbols to tell us
+      where regions of code occur, so in the absence of such symbols
+      we default to treating the words as data.  */
+   if (info->symtab != NULL
+       && bfd_asymbol_flavour (*info->symtab) == bfd_target_elf_flavour)
+     is_data = TRUE;
+
    if (info->disassembler_options)
      {
        parse_disassembler_options (info->disassembler_options);


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