2018-04-30 Andrew Sadek  <andrew.sadek.se@gmail.com>

gcc/ChangeLog:
	* config/microblaze/microblaze.opt: add new option -mpic-data-text-rel.
	* config/microblaze/microblaze-protos.h (microblaze_constant_address_p):
	Add declaration.
	* gcc/config/microblaze/microblaze.h (microblaze_constant_address_p):
	CONSTANT_ADDRESS_P definition to microblaze_constant_address_p.
	* config/microblaze/microblaze.c (TARGET_PIC_DATA_TEXT_REL):
	New addressing mode for data-text relative position indepenedent code.
	(microblaze_classify_unspec): add 'UNSPEC_TEXT' case ->
	'ADDRESS_SYMBOLIC_TXT_REL'.
	(microblaze_classify_address): Add handling for UNSPEC + CONST_INT.
	(microblaze_legitimate_pic_operand): Exclude function calls from
	pic operands in case of TARGET_PIC_DATA_TEXT_REL option.
	(microblaze_legitimize_address): Generate 'UNSPEC_TEXT' for all possible
	addresses cases.
	(microblaze_address_insns): Add 'ADDRESS_SYMBOLIC_TXT_REL' case.
	(print_operand): Add 'ADDRESS_SYMBOLIC_TXT_REL' case.
	(print_operand_address): Add 'ADDRESS_SYMBOLIC_TXT_REL' case + handling
	for 'address + offset'.
	(microblaze_expand_prologue): Add new function prologue call for
	'r20' assignation.
	(microblaze_asm_generate_pic_addr_dif_vec): Override new target hook
	'TARGET_ASM_GENERATE_PIC_ADDR_DIFF_VEC' to disable address diff vector
	table in case of TARGET_PIC_DATA_TEXT_REL.
	(expand_pic_symbol_ref): Add handling for 'UNSPEC_TEXT'.
	* gcc/config/microblaze/microblaze.md (TARGET_PIC_DATA_TEXT_REL):
	Add new macros 'UNSPEC_TEXT',
	'UNSPEC_SET_TEXT' + add rule for setting r20 in function prologue
	+ exclude function calls from 'UNSPEC_PLT' in case of data text
	relative mode.
	* doc/tm.texi.in (TARGET_ASM_GENERATE_PIC_ADDR_DIFF_VEC): Add
	new target hook for generating address diff vector tables in case of
	flag_pic.
	* doc/tm.texi : Regenerate.
	* stmt.c (TARGET_ASM_GENERATE_PIC_ADDR_DIFF_VEC): Append new condition
	'targetm.asm_out.generate_pic_addr_diff_vec' to flag_pic in case
	of addr diff vector generation.
	* target.def (TARGET_ASM_GENERATE_PIC_ADDR_DIFF_VEC): Add
	target hook definition.
	* targhooks.h, gcc/targhooks.c (TARGET_ASM_GENERATE_PIC_ADDR_DIFF_VEC):
	Add default function for generate_pic_addr_diff_vec -> flag_pic.
	* doc/invoke.texi (Add new pic option): Add new microblaze pic
	option for data text relative.

testsuite/ChangeLog:
	* gcc.target/microblaze/others/data_var1.c: Include
	PIC case of r20 base register.
	* gcc.target/microblaze/others/data_var2.c: Ditto.
	* gcc.target/microblaze/others/picdtr.c: Add new
	test case for -mpic-is-data-text-relative.
	* gcc.target/microblaze/others/sdata_var1.c: Add
	* gcc.target/microblaze/others/sdata_var2.c: Ditto.
	* gcc.target/microblaze/others/sdata_var3.c: Ditto.
	* gcc.target/microblaze/others/sdata_var4.c: Ditto.
	* gcc.target/microblaze/others/sdata_var5.c: Ditto.
	* gcc.target/microblaze/others/sdata_var6.c: Ditto.
	* gcc.target/microblaze/others/string_cst1_gpopt.c:	Ditto.
	* gcc.target/microblaze/others/string_cst2_gpopt.c: Ditto.

From-SVN: r259758