if (reg == -1)
internal_error (__FILE__, __LINE__,
_("Register $%s not available"), name);
+ /* No support for tracing user registers yet. */
+ if (reg >= gdbarch_num_regs (exp->gdbarch)
+ + gdbarch_num_pseudo_regs (exp->gdbarch))
+ error (_("'%s' is a pseudo-register; "
+ "GDB cannot yet trace pseudoregister contents."),
+ name);
value->kind = axs_lvalue_register;
value->u.reg = reg;
value->type = register_type (exp->gdbarch, reg);