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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.
Index: gdb/ChangeLog from Alexandre Oliva <aoliva at redhat dot 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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