Various fixes to linker relaxation. In general, we need to support
relaxing every branch, even if we don't relax it in the assembler,
so we can optionally defer relaxation to the linker.
* elf32-rl78.c (rl78_offset_for_reloc): Add more relocs.
(rl78_elf_relax_section): Add bc/bz/bnc/bnz/bh/bnh. Fix reloc
choices.
* config/rl78-parse.y: Make all branches relaxable via
rl78_linkrelax_branch().
* config/tc-rl78.c (rl78_linkrelax_branch): Mark all relaxable
branches with relocs.
(options): Add OPTION_NORELAX.
(md_longopts): Add -mnorelax.
(md_parse_option): Support OPTION_NORELAX.
(op_type_T): Add bh, sk, call, and br.
(rl78_opcode_type): Likewise.
(rl78_relax_frag): Fix not-relaxing logic. Add sk.
(md_convert_frag): Fix relocation handling.
(tc_gen_reloc): Strip relax relocs when not linker relaxing.
(md_apply_fix): Defer overflow handling for anything that needs a
PLT, to the linker.
* config/tc-rl78.h (TC_FORCE_RELOCATION): Force all relocations to
the linker when linker relaxing.
* doc/c-rl78.texi (norelax): Add.
This patch adds initial in-gas opcode relaxation for the rl78
backend. Specifically, it checks for conditional branches that
are too far and replaces them with inverted branches around longer
fixed branches.
* elf32-rl78.c (rl78_elf_howto_table): Add R_RL78_RH_RELAX.
(rl78_reloc_map): Add BFD_RELOC_RL78_RELAX.
(rl78_elf_relocate_section): Add R_RL78_RH_RELAX, R_RL78_RH_SFR,
and R_RL78_RH_SADDR.
(rl78_elf_finish_dynamic_sections): Only validate PLT section if
we didn't relax anything, as relaxing might remove a PLT reference
after we've set up the table.
(elf32_rl78_relax_delete_bytes): New.
(reloc_bubblesort): New.
(rl78_offset_for_reloc): New.
(relax_addr16): New.
(rl78_elf_relax_section): Add support for relaxing long
instructions into short ones.
[gas]
* config/rl78-defs.h (rl78_linkrelax_addr16): Add.
(rl78_linkrelax_dsp, rl78_linkrelax_imm): Remove.
* config/rl78-parse.y: Tag all addr16 and branch patterns with
relaxation markers.
* config/tc-rl78.c (rl78_linkrelax_addr16): New.
(rl78_linkrelax_branch): New.
(OPTION_RELAX): New.
(md_longopts): Add relax option.
(md_parse_option): Add OPTION_RELAX.
(rl78_frag_init): Support relaxation.
(rl78_handle_align): New.
(md_assemble): Support relaxation.
(md_apply_fix): Likewise.
(md_convert_frag): Likewise.
* config/tc-rl78.h (MAX_MEM_FOR_RS_ALIGN_CODE): New.
(HANDLE_ALIGN): New.
(rl78_handle_align): Declare.
* config/rl78-parse.y (rl78_bit_insn): New. Set it for all bit
insn patterns.
(find_bit_index): New. Strip .BIT suffix off relevent
expressions for bit insns.
(rl78_lex): Exclude bit suffixes from expression parsing.
[include/elf]
* rl78.h (R_RL78_RH_RELAX, R_RL78_RH_SFR, R_RL78_RH_SADDR): New.
(RL78_RELAXA_BRA, RL78_RELAXA_ADDR16: New.
