* NEWS: Document target described register support for PowerPC.

	* NEWS: Document target described register support for PowerPC.
	* ppc-tdep.h: Remove ppc_spr constants.
	(struct gdbarch_tdep): Remove regs, ppc_sr0_regnum, and
	ppc_builtin_type_vec128 members.
	(PPC_R0_REGNUM, PPC_F0_REGNUM, PPC_PC_REGNUM, PPC_MSR_REGNUM)
	(PPC_CR_REGNUM, PPC_LR_REGNUM, PPC_CTR_REGNUM, PPC_XER_REGNUM)
	(PPC_FPSCR_REGNUM, PPC_MQ_REGNUM, PPC_SPE_UPPER_GP0_REGNUM)
	(PPC_SPE_ACC_REGNUM, PPC_SPE_FSCR_REGNUM, PPC_VR0_REGNUM)
	(PPC_VSCR_REGNUM, PPC_VRSAVE_REGNUM, PPC_NUM_REGS): New constants.
	* rs6000-tdep.c: Include preparsed descriptions.
	(init_sim_regno_table): Do not iterate over pseudo registers.
	Look up segment registers by name.  Use sim_spr_register_name
	for SPRs.
	(rs6000_register_sim_regno): Call init_sim_regno_table here.
	(rs6000_builtin_type_vec128): Delete.
	(rs6000_register_name): Only handle SPE pseudo registers and upper
	halves.  Call tdesc_register_name for everything else.
	(rs6000_register_type): Delete.  Replace with...
	(rs6000_pseudo_register_type): ...this new function.  Only handle
	SPE pseudo registers.
	(rs6000_register_reggroup_p): Delete.  Replace with...
	(rs6000_pseudo_register_reggroup_p): ...this new function.  Only
	handle SPE pseudo registers.
	(rs6000_convert_register_p): Use ppc_fp0_regnum instead of
	"struct reg".
	(rs6000_register_to_value, rs6000_value_to_register): Remove check
	of reg->fpr.
	(e500_register_reggroup_p): Delete.
	(STR, R, R4, R8, R16, F, P8, R32, R64, R0, A4, S, S4, SN4, S64)
	(COMMON_UISA_REGS, PPC_UISA_SPRS, PPC_UISA_NOFP_SPRS)
	(PPC_SEGMENT_REGS, PPC_OEA_SPRS, PPC_ALTIVEC_REGS, PPC_SPE_GP_REGS)
	(PPC_SPE_UPPER_GP_REGS, PPC_EV_PSEUDO_REGS): Delete macros.
	(registers_powerpc, registers_403, registers_403GC, registers_505)
	(registers_860, registers_601, registers_602, registers_603)
	(registers_604, registers_750, registers_7400, registers_e500): Delete
	variables.
	(struct variant): Delete nregs, npregs, num_tot_regs, and regs.  Add
	tdesc.
	(tot_num_registers, num_registers, num_pseudo_registers): Delete.
	(variants): Delete outdated comment.  Use standard target descriptions
	instead of "struct reg" arrays.
	(init_variants): Delete.
	(rs6000_gdbarch_init): Do not guess word size from the BFD
	architecture if we have a target description.  Select a variant
	before creating a new architecture.  Use the variant's target
	description if the target did not define a register layout.
	Validate target-supplied registers.  Reject mismatches.  Use
	fixed register numbers and new constants instead of magic
	numbers.  Call set_gdbarch_ps_regnum.  Call tdesc_use_registers.
	(_initialize_rs6000_tdep): Initialize the preparsed target
	descriptions.
	* target-descriptions.c (tdesc_predefined_types): Add int128 and
	uint128.
	(tdesc_find_register_early): New function.
	(tdesc_numbered_register): Use it.
	(tdesc_register_size): New function.
	(tdesc_use_registers): Take a target_desc argument.  Do not use
	gdbarch_target_desc.
	* target-descriptions.h (tdesc_use_registers): Update prototype
	and comment.
	(tdesc_register_size): New prototype.
	* Makefile.in (powerpc_32_c, powerpc_403_c, powerpc_403gc_c)
	(powerpc_505_c, powerpc_601_c, powerpc_602_c, powerpc_603_c)
	(powerpc_604_c, powerpc_64_c, powerpc_7400_c, powerpc_750_c)
	(powerpc_860_c, powerpc_e500_c, rs6000_c): New macros.
	(rs6000-tdep.o): Update.
	* arm-tdep.c (arm_gdbarch_init): Update call to tdesc_use_registers.
	* m68k-tdep.c (m68k_gdbarch_init): Likewise.
	* mips-tdep.c (mips_gdbarch_init): Likewise.

	* gdb.texinfo (Predefined Target Types): Add int128
	and uint128.
	(Standard Target Features): Add PowerPC features.

	* gdb.xml/tdesc-regs.exp: Add PowerPC support.

	* sim-ppc.h (sim_spr_register_name): New prototype.

	* gdb-sim.c (regnum2spr): Rename to...
	(sim_spr_register_name): ... this.  Make global.