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

["gjl at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

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

--- Comment #8 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-11-18 16:44:12 UTC ---
Author: gjl
Date: Fri Nov 18 16:44:00 2011
New Revision: 181482

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=181482
Log:
gcc/
    PR target/49868
    * config/avr/avr.h (base_arch_s): Add field n_segments.
    (ADDR_SPACE_PGM1, ADDR_SPACE_PGM2, ADDR_SPACE_PGM3,
    ADDR_SPACE_PGM4, ADDR_SPACE_PGM5, ADDR_SPACE_PGMX): New address spaces.
    (AVR_HAVE_ELPM, AVR_HAVE_ELPMX): New defines.
    (INIT_EXPANDERS): New define.
    * config/avr/avr-protos.h (avr_mem_pgmx_p): New.
    (avr_init_expanders): New.
    (avr_emit_movmemhi, avr_out_movmem): New.
    (avr_xload_libgcc_p): New.
    * config/avr/avr-c.c (avr_register_target_pragmas): Register
    address spaces __pgm1, __pgm2,  __pgm3,  __pgm4  __pgm5,  __pgmx.
    (avr_cpu_cpp_builtins): Add built-in defines __PGM1,
    __PGM2, __PGM3, __PGM4, __PGM5, __PGMX.
    * config/avr/avr-devices.c (avr_arch_types): Set field n_segments.

    * config/avr/avr.c (AVR_SECTION_PROGMEM): Change define to cover
    3 bits instead of just 1.
    (xstring_empty, xstring_e, rampz_rtx): New static GTYed variables.
    (progmem_section): Change from section to array of sections.
    (progmem_section_prefix): New static variable.
    (avr_file_start): Print set for __RAMPZ__
    (avr_option_override): Move initialization of RTXes from here...
    (avr_init_expanders): ...to this new function.
    (avr_pgm_segment): New static function.
    (avr_decl_pgm_p): Handle error_mark_node.
    (avr_mem_pgmx_p, avr_decl_pgmx_p): New static functions.
    (avr_out_xload,    avr_find_unused_d_reg): New static functions.
    (expand_prologue, expand_epilogue): Use rampz_rtx.
    (print_operand): Hande CONST_STRING.
    (avr_xload_libgcc_p): New static function.
    (avr_out_lpm_no_lpmx, avr_out_lpm): Handle ELPM.
    (avr_progmem_p): Return 2 for 24-bit flash address space.
    (avr_out_sbxx_branch): Clean-up code from ASn macros.
    (out_movqi_r_mr, out_movqi_mr_r): Ditto. And recognize RAMPZ's
    address and print symbolically.
    (avr_asm_named_section, avr_section_type_flags,
    avr_encode_section_info, avr_asm_select_section,
    avr_addr_space_address_mode, avr_addr_space_pointer_mode,
    avr_addr_space_legitimate_address_p, avr_addr_space_convert,
    avr_addr_space_legitimize_address): Handle new address spaces.
    (avr_output_progmem_section_asm_op): New static function.
    (avr_asm_init_sections): Initialize progmem_section[].
    (adjust_insn_length): Handle ADJUST_LEN_XLOAD, ADJUST_LEN_MOVMEM.
    (avr_const_address_lo16): New static function.
    (avr_assemble_integer): Use it to handle 3-byte integers.
    (avr_emit_movmemhi, avr_out_movmem): New functions.

    * config/avr/predicates.md (nox_general_operand): Handle new
    address spaces.
    * config/avr/avr.md (unspec): Add UNSPEC_MOVMEM.
    (adjust_len): Add xload, movmem.
    (SP_ADDR): New define_constants.
    (isa): Add "lpm", "lpmx", "elpm", "elpmx".
    (enabled): Handle them.
    (load<mode>_libgcc): New expander.
    (*load.<mode>.libgcc): Rename to load_<mode>_libgcc.
    (xload8_A, xload<mode>_A): New insn-and-splits.
    (xload_8, xload_<mode>_libgcc, xload_<mode>, loadmem_elpm): New insns.
    (mov<mode>): Handle new address spaces.
    (movmemhi): Rewrite using avr_emit_movmemhi.
    (MOVMEM_r_d): New mode attribute.
    (movmem_<mode>, movmem_qi_elpm): New insns.
    (setmemhi, *clrmemqi, *clrmemhi, strlenhi, *strlenhi): Unquote
    C-code.  Use label instead of hard-coded instrunction lengths.

libgcc/
    PR target/49868
    * config/avr/t-avr (LIB1ASMFUNCS): Add _xload_2 _xload_3 _xload_4.
    * config/avr/lib1funcs.S (__xload_2, __xload_3, __xload_4):
    New functions.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/avr/avr-c.c
    trunk/gcc/config/avr/avr-devices.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