* regcache.c (struct regcache): Add ptid_t member.
(regcache_xmalloc): Initialize it.
(regcache_cpy_no_passthrough): Do not refer to current_regcache.
(regcache_dup): Likewise.
(regcache_dup_no_passthrough): Likewise.
(current_regcache): Make static.
(registers_ptid): Remove variable.
(get_thread_regcache): New function.
(get_current_regcache): New function.
(registers_changed): Implement by freeing current regcache.
(regcache_raw_read): Do not refer to current_regcache. Set
inferior_ptid to regcache->ptid while calling target routines.
(regcache_raw_write): Likewise.
(regcache_raw_supply): Do not refer to current_regcache.
(read_pc_pid): Use thread regcache. Do not modify inferior_ptid.
(write_pc_pid): Likewise.
(build_regcache): Remove.
(_initialize_regcache): Do not call DEPRECATED_REGISTER_GDBARCH_SWAP
or deprecated_register_gdbarch_swap. Do not initialize
registers_ptid.
* regcache.h (get_current_regcache): Add prototype.
(get_thread_regcache): Likewise.
(current_regcache): Remove declaration.
* corelow.c (core_open): Replace current_regcache by
get_current_regcache ().
* frame.c (frame_pop): Likewise.
(put_frame_register): Likewise.
(get_current_frame, create_new_frame): Likewise.
* mi/mi-main.c (mi_cmd_data_write_register_values): Likewise.
* stack.c (return_command): Likewise.
* infcall.c (call_function_by_hand): Likewise.
* infrun.c (resume): Likewise.
(save_inferior_status, restore_inferior_status): Likewise.
* linux-fork.c (fork_load_infrun_state): Likewise.
(fork_save_infrun_state): Likewise.
* win32-nat.c (win32_resume): Likewise.
* i386fbsd-nat.c (i386fbsd_resume): Likewise.
* monitor.c (monitor_wait): Likewise.
* remote.c (remote_wait): Likewise.
* remote-mips.c (mips_wait): Likewise.
* bsd-kvm.c (bsd_kvm_open): Likewise
(bsd_kvm_proc_cmd, bsd_kvm_pcb_cmd): Likewise.
* fbsd-nat.c (fbsd_make_corefile_notes): Likewise.
* i386-linux-nat.c (i386_linux_resume): Likewise.
* ia64-linux-nat.c (ia64_linux_insert_watchpoint): Likewise.
(ia64_linux_stopped_data_address): Likewise.
* frv-tdep.c (frv_fdpic_loadmap_addresses): Likewise.
* m32c-tdep.c (m32c_virtual_frame_pointer): Likewise.
* mep-tdep.c (current_me_module, current_options): Likewise.
* mips-tdep.c (deprecated_mips_set_processor_regs_hack): Likewise.
* linux-nat.c (linux_nat_do_thread_registers): Use thread
regcache instead of current_regcache. Call target_fetch_registers.
(linux_nat_corefile_thread_callback): Update call site.
(linux_nat_do_registers): Likewise.
* procfs.c (procfs_do_thread_registers): Use thread regcache instead
of current_regcache.
(procfs_make_note_section): Likewise.
* proc-service.c (ps_lgetregs, ps_lsetregs): Likewise.
(ps_lgetfpregs, ps_lsetfpregs): Likewise.
* sol-thread.c (ps_lgetregs, ps_lsetregs): Likewise.
(ps_lgetfpregs, ps_lsetfpregs): Likewise.
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