* alpha-tdep.c (alpha_supply_int_regs, alpha_fill_int_regs): New.
(alpha_supply_fp_regs, alpha_fill_fp_regs): New.
* alpha-tdep.h: Declare them.
* alpha-nat.c (fetch_osf_core_registers): Constify core_reg_mapping.
Remove zerobuf. Don't error on UNIQUE.
(fetch_elf_core_registers): Use alpha_supply_{int,fp}_regs.
(ALPHA_REGSET_UNIQUE): Provide default.
(supply_gregset): Use alpha_supply_int_regs.
(fill_gregset): Use alpha_fill_int_regs.
(supply_fpregset): Use alpha_supply_fp_regs.
(fill_fpregset): Use alpha_fill_fp_regs.
* alphabsd-tdep.c (NUM_GREGS, NUM_FPREGS): Remove.
(alphabsd_supply_reg): Use alpha_supply_int_regs.
(alphabsd_fill_reg): Use alpha_fill_int_regs.
(alphabsd_supply_fpreg): Use alpha_supply_fp_regs.
(alphabsd_fill_fpreg): Use alpha_fill_fp_regs.
* config/alpha/nm-linux.h (ALPHA_REGSET_UNIQUE): New.