[Bug target/49868] Implement named address space to place/access data in flash memory

[gjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49868

--- Comment #7 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-11-15 09:01:50 UTC ---
Author: gjl
Date: Tue Nov 15 09:01:46 2011
New Revision: 181378

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=181378
Log:
gcc/
    PR target/49868
    * config/avr/avr.h (ADDR_SPACE_PGM): New address spaces.
    (REGISTER_TARGET_PRAGMAS): New define.
    * config/avr/avr-protos.h (avr_mem_pgm_p): New.
    (avr_load_libgcc_p): New.
    (asm_output_external_libcall): Remove.
    (avr_register_target_pragmas): New.
    (avr_log_t): Add field "progmem".  Order alphabetically.
    * config/avr/avr-log.c (avr_log_set_avr_log): Set avr_log.progmem.
    * config/avr/avr-c.c (langhooks.h): New include.
    (avr_register_target_pragmas): New function. Register address
    space __pgm.
    (avr_cpu_cpp_builtins): Add built-in define __PGM.
    * config/avr/avr.c: Include "c-family/c-common.h".
    (TARGET_LEGITIMATE_ADDRESS_P): Remove define.
    (TARGET_LEGITIMIZE_ADDRESS): Remove define.
    (TARGET_ADDR_SPACE_SUBSET_P): Define to...
    (avr_addr_space_subset_p): ...this new static function.
    (TARGET_ADDR_SPACE_CONVERT): Define to...
    (avr_addr_space_convert): ...this new static function.
    (TARGET_ADDR_SPACE_ADDRESS_MODE): Define to...
    (avr_addr_space_address_mode): ...this new static function.
    (TARGET_ADDR_SPACE_POINTER_MODE): Define to...
    (avr_addr_space_pointer_mode): ...this new static function.
    (TARGET_ADDR_SPACE_LEGITIMATE_ADDRESS_P): Define to...
    (avr_addr_space_legitimate_address_p): ...this new static function.
    (TARGET_ADDR_SPACE_LEGITIMIZE_ADDRESS): Define to...
    (avr_addr_space_legitimize_address): ...this new static function.
    (avr_mode_code_base_reg_class): Handle address spaces.
    (avr_regno_mode_code_ok_for_base_p): Ditto.
    (lpm_addr_reg_rtx, lpm_reg_rtx, all_regs_rtx): New static variables.
    (avr_option_override): Initialize them.
    (output_reload_in_const): Use all_regs_rtx. Fix signedness of loop
    variables.
    (avr_pgm_segment): New static function.
    (avr_decl_pgm_p, avr_mem_pgm_p): New static functions.
    (avr_out_lpm, avr_out_lpm_no_lpmx): New static functions.
    (output_movqi, output_movhi, output_movsisf, avr_out_movpsi): Call
    avr_out_lpm to handle loads from progmem.
    (avr_load_libgcc_p): New static function.
    (avr_progmem_p): Test if decl is in flash.
    (avr_pgm_pointer_const_p): New static function.
    (avr_nonconst_pointer_addrspace): New static function.
    (avr_pgm_check_var_decl): New static function.
    (avr_insert_attributes): Use it.  Change error message to report
    cause (progmem or address space) when code wants to write to flash.
    (avr_section_type_flags): Unset section flag SECTION_BSS for
    data in progmem.
    * config/avr/predicates.md (nop_general_operand): New predicate.
    (nox_general_operand): New predicate.
    * config/avr/avr.md (LPM_REGNO): New define_constant.
    (load<mode>_libgcc): New expander.
    (*load.<mode>.libgcc): New insn.
    (mov<mode>): Handle loads from non-generic AS.
    (movmemhi): Ditto.  Propagate address space information to newly
    created MEM.
    (movqi_insn, *movhi, *movpsi, *movsi, *movsf): Change predicate #1
    to nox_general_operand.
    (ashrqi3, ashrhi3, ashrsi3): Change predicate #1 to nop_general_operand.
    (ashlqi3, *ashlqi3, ashlhi3, ashlsi3): Ditto.
    (lshrqi3, *lshrqi3, lshrhi3, lshrsi3): Ditto.
    (split-lpmx): New split.
    (*ashlhi3_const, *ashlsi3_const, *ashrhi3_const, *ashrsi3_const,
    *lshrhi3_const, *lshrsi3_const): Indent, unquote C.

libgcc/
    PR target/49868
    * config/avr/t-avr (LIB1ASMFUNCS): Add _load_3,  _load_4.
    * config/avr/lib1funcs.S (__load_3, __load_4, __xload_2): New functions.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/avr/avr-c.c
    trunk/gcc/config/avr/avr-log.c
    trunk/gcc/config/avr/avr-protos.h
    trunk/gcc/config/avr/avr.c
    trunk/gcc/config/avr/avr.h
    trunk/gcc/config/avr/avr.md
    trunk/gcc/config/avr/predicates.md
    trunk/libgcc/ChangeLog
    trunk/libgcc/config/avr/lib1funcs.S
    trunk/libgcc/config/avr/t-avr