11553Srgrimes/* Definitions for Altera Nios II assembler. 21553Srgrimes Copyright (C) 2012-2020 Free Software Foundation, Inc. 31553Srgrimes Contributed by Nigel Gray (ngray@altera.com). 41553Srgrimes Contributed by Mentor Graphics, Inc. 51553Srgrimes 61553Srgrimes This file is part of GAS, the GNU Assembler. 71553Srgrimes 81553Srgrimes GAS is free software; you can redistribute it and/or modify 91553Srgrimes it under the terms of the GNU General Public License as published by 101553Srgrimes the Free Software Foundation; either version 3, or (at your option) 111553Srgrimes any later version. 121553Srgrimes 131553Srgrimes GAS is distributed in the hope that it will be useful, 141553Srgrimes but WITHOUT ANY WARRANTY; without even the implied warranty of 151553Srgrimes MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 161553Srgrimes GNU General Public License for more details. 171553Srgrimes 181553Srgrimes You should have received a copy of the GNU General Public License 191553Srgrimes along with GAS; see the file COPYING. If not, write to the Free 201553Srgrimes Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 211553Srgrimes 02110-1301, USA. */ 221553Srgrimes 231553Srgrimes#ifndef TC_NIOS2 241553Srgrimes#define TC_NIOS2 251553Srgrimes 261553Srgrimes/* If unspecified, default to little endian. We can explicitly specify 271553Srgrimes * a big-endian default by configuring with --target=nios2eb-elf. We 281553Srgrimes * can override the default with the -EB and -EL options. */ 291553Srgrimes#ifndef TARGET_BYTES_BIG_ENDIAN 301553Srgrimes#define TARGET_BYTES_BIG_ENDIAN 0 311553Srgrimes#endif 321553Srgrimes 331553Srgrimes/* Words are big enough to hold addresses. */ 341553Srgrimes#define WORKING_DOT_WORD 1 3529602Scharnier 361553Srgrimes#ifdef OBJ_ELF 371553Srgrimesextern const char *nios2_target_format (void); 381553Srgrimes#define TARGET_FORMAT nios2_target_format () 391553Srgrimes#define TARGET_ARCH bfd_arch_nios2 401553Srgrimes#endif 4129602Scharnier 4229602Scharnier/* A NIOS2 instruction consists of tokens and separator characters 4329602Scharnier the tokens are things like the instruction name (add, or jmp etc), 4429602Scharnier the register indices ($5, $7 etc), and constant expressions. The 4548988Ssheldonh separator characters are commas, brackets and space. 461553Srgrimes The instruction name is always separated from other tokens by a space 471553Srgrimes The maximum number of tokens in an instruction is 5 (the instruction name, 481553Srgrimes 3 arguments, and a 4th string representing the expected instruct in opcode 491553Srgrimes after assembly. The latter is only used when the assemble is running in 501553Srgrimes self test mode, otherwise its presence will generate an error. */ 511553Srgrimes#define NIOS2_MAX_INSN_TOKENS 6 521553Srgrimes 531553Srgrimes/* There are no machine-specific operands so we #define this to nothing. */ 541553Srgrimes#define md_operand(x) 551553Srgrimes 561553Srgrimes/* Function prototypes exported to rest of GAS. */ 571553Srgrimesextern void md_assemble (char *op_str); 581553Srgrimesextern void md_end (void); 591553Srgrimesextern void md_begin (void); 601553Srgrimes 611553Srgrimes#define TC_FORCE_RELOCATION(fixp) nios2_force_relocation (fixp) 621553Srgrimesextern int nios2_force_relocation (struct fix *); 638857Srgrimes 641553Srgrimes#define tc_fix_adjustable(fixp) nios2_fix_adjustable (fixp) 651553Srgrimesextern int nios2_fix_adjustable (struct fix *); 661553Srgrimes 671553Srgrimes#define tc_frob_label(lab) nios2_frob_label (lab) 681553Srgrimesextern void nios2_frob_label (symbolS *); 691553Srgrimes 701553Srgrimes#define tc_frob_symbol(symp, punt) punt = nios2_frob_symbol (symp) ? 1 : punt 711553Srgrimesextern int nios2_frob_symbol (symbolS * symp); 721553Srgrimes 731553Srgrimes#define md_cons_align(nbytes) nios2_cons_align (nbytes) 741553Srgrimesextern void nios2_cons_align (int); 751553Srgrimes 761553Srgrimesextern void md_convert_frag (bfd * headers, segT sec, fragS * fragP); 771553Srgrimes 781553Srgrimes/* When relaxing, we need to generate relocations for alignment 791553Srgrimes directives. */ 801553Srgrimes#define HANDLE_ALIGN(frag) nios2_handle_align (frag) 811553Srgrimesextern void nios2_handle_align (fragS *); 821553Srgrimes 831553Srgrimes#define md_relax_frag nios2_relax_frag 841553Srgrimesextern long nios2_relax_frag (segT segment, fragS * fragP, long stretch); 851553Srgrimes 861553Srgrimes#ifdef OBJ_ELF 871553Srgrimes#define ELF_TC_SPECIAL_SECTIONS \ 881553Srgrimes { ".sdata", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL }, \ 891553Srgrimes { ".sbss", SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL }, \ 901553Srgrimes { ".lit4", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL }, \ 911553Srgrimes { ".lit8", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL }, 921553Srgrimes 931553Srgrimes/* Processor-specific section directives. */ 941553Srgrimes#define md_elf_section_letter nios2_elf_section_letter 952657Scsgrextern int nios2_elf_section_letter (int, const char **); 962657Scsgr#define md_elf_section_flags nios2_elf_section_flags 972657Scsgrextern flagword nios2_elf_section_flags (flagword, int, int); 982657Scsgr#endif 992657Scsgr 1002657Scsgr#define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_" 1012657Scsgr 1022657Scsgr#define DIFF_EXPR_OK 1032657Scsgr 1041553Srgrimes/* Don't allow the generic code to convert fixups involving the 1051553Srgrimes subtraction of a label in the current section to pc-relative if we 1061553Srgrimes don't have the necessary pc-relative relocation. */ 1071553Srgrimes#define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \ 1081553Srgrimes (!((FIX)->fx_r_type == BFD_RELOC_16 \ 1091553Srgrimes || (FIX)->fx_r_type == BFD_RELOC_NIOS2_LO16 \ 1101553Srgrimes || (FIX)->fx_r_type == BFD_RELOC_NIOS2_HIADJ16)) 1111553Srgrimes 1121553Srgrimes/* Nios2 ABI doesn't have 32-bit PCREL relocation, and, as relocations for 11336042Sguido CFI information will be in section other than .text, we can't use PC-biased 1141553Srgrimes relocs. */ 1152657Scsgr#define CFI_DIFF_EXPR_OK 0 11619617Sjulian 1171553Srgrimes#define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) nios2_cons (EXP, NBYTES) 1181553Srgrimesextern bfd_reloc_code_real_type nios2_cons (expressionS *exp, int size); 11929602Scharnier 1201553Srgrimes/* We want .cfi_* pseudo-ops for generating unwind info. */ 12130807Sache#define TARGET_USE_CFIPOP 1 1221553Srgrimes#define DWARF2_DEFAULT_RETURN_COLUMN 31 1231553Srgrimes#define DWARF2_CIE_DATA_ALIGNMENT (-4) 1241553Srgrimes#define tc_regname_to_dw2regnum nios2_regname_to_dw2regnum 1251553Srgrimesextern int nios2_regname_to_dw2regnum (char *regname); 1261553Srgrimes#define tc_cfi_frame_initial_instructions nios2_frame_initial_instructions 1271553Srgrimesextern void nios2_frame_initial_instructions (void); 1281553Srgrimes 12948279Ssheldonh#define elf_tc_final_processing nios2_elf_final_processing 1301553Srgrimesextern void nios2_elf_final_processing (void); 13113142Speter 13219617Sjulian#endif /* TC_NIOS2 */ 1331553Srgrimes