use MIPS NewABI register names when disassembling NewABI code

[Alexandre Oliva <aoliva@redhat.com>]

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mips-opc.c:_print_insn_mips decides which register naming convention
to use obtaining a pointer to the bfd from the first symbol in the
symbols field from the disassemble_info argument, and then looking for
ABI information in the ELF headers.  Unfortunately, gdb doesn't set up
symbols, so we end up always using the o32 register naming
convention.  This patch arranges for the information the disassembler
uses to be passed to it, in an admittedly ugly, but effective way.  Ok
to install?


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Index: gdb/ChangeLog
from  Alexandre Oliva  <aoliva@redhat.com>

	* mips-tdep.c (mips_gdbarch_init): Set tm_print_insn_info.symbols
	to at least an empty symbol.

Index: gdb/mips-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/mips-tdep.c,v
retrieving revision 1.185
diff -u -p -r1.185 mips-tdep.c
--- gdb/mips-tdep.c 7 Apr 2003 18:38:04 -0000 1.185
+++ gdb/mips-tdep.c 8 Apr 2003 02:26:04 -0000
@@ -5656,6 +5656,24 @@ mips_gdbarch_init (struct gdbarch_info i
 
   if (info.abfd)
     {
+      static asymbol *symbols = NULL;
+
+      /* The disassembler uses *info.symbols to get to the bfd elf
+	 flags, which it uses to tell the executable ABI, so we have
+	 to give it at least one symbol.  */
+      if (tm_print_insn_info.symbols == NULL
+	  || tm_print_insn_info.symbols == &symbols)
+	{
+	  /* It would be nice if we could bfd_release the previous
+	     symbol, but we'd need a pointer to its bfd then.  */
+	  symbols = bfd_make_empty_symbol (info.abfd);
+	  if (symbols != NULL)
+	    {
+	      tm_print_insn_info.symbols = &symbols;
+	      tm_print_insn_info.num_symbols = 0;
+	    }
+	}
+
       /* First of all, extract the elf_flags, if available.  */
       if (bfd_get_flavour (info.abfd) == bfd_target_elf_flavour)
 	elf_flags = elf_elfheader (info.abfd)->e_flags;

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                 aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist                Professional serial bug killer