gas/config/tc-nios2.h

   1 /* Definitions for Altera Nios II assembler.
   2    Copyright (C) 2012-2021 Free Software Foundation, Inc.
   3    Contributed by Nigel Gray (ngray@altera.com).
   4    Contributed by Mentor Graphics, Inc.
   5
   6    This file is part of GAS, the GNU Assembler.
   7
   8    GAS is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3, or (at your option)
  11    any later version.
  12
  13    GAS is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GAS; see the file COPYING.  If not, write to the Free
  20    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  21    02110-1301, USA.  */
  22
  23 #ifndef TC_NIOS2
  24 #define TC_NIOS2
  25
  26 /* If unspecified, default to little endian.  We can explicitly specify
  27  * a big-endian default by configuring with --target=nios2eb-elf.  We
  28  * can override the default with the -EB and -EL options.  */
  29 #ifndef TARGET_BYTES_BIG_ENDIAN
  30 #define TARGET_BYTES_BIG_ENDIAN 0
  31 #endif
  32
  33 /* Words are big enough to hold addresses.  */
  34 #define WORKING_DOT_WORD        1
  35
  36 #ifdef OBJ_ELF
  37 extern const char *nios2_target_format (void);
  38 #define TARGET_FORMAT  nios2_target_format ()
  39 #define TARGET_ARCH    bfd_arch_nios2
  40 #endif
  41
  42 /* A NIOS2 instruction consists of tokens and separator characters
  43    the tokens are things like the instruction name (add, or jmp etc),
  44    the register indices ($5, $7 etc), and constant expressions. The
  45    separator characters are commas, brackets and space.
  46    The instruction name is always separated from other tokens by a space
  47    The maximum number of tokens in an instruction is 5 (the instruction name,
  48    3 arguments, and a 4th string representing the expected instruct in opcode
  49    after assembly. The latter is only used when the assemble is running in
  50    self test mode, otherwise its presence will generate an error.  */
  51 #define NIOS2_MAX_INSN_TOKENS   6
  52
  53 /* There are no machine-specific operands so we #define this to nothing.  */
  54 #define md_operand(x)
  55
  56 /* Function prototypes exported to rest of GAS.  */
  57 extern void md_assemble (char *op_str);
  58 extern void md_end (void);
  59 extern void md_begin (void);
  60
  61 #define TC_FORCE_RELOCATION(fixp) nios2_force_relocation (fixp)
  62 extern int nios2_force_relocation (struct fix *);
  63
  64 #define tc_fix_adjustable(fixp) nios2_fix_adjustable (fixp)
  65 extern int nios2_fix_adjustable (struct fix *);
  66
  67 #define tc_frob_label(lab)           nios2_frob_label (lab)
  68 extern void nios2_frob_label (symbolS *);
  69
  70 #define tc_frob_symbol(symp, punt)  punt = nios2_frob_symbol (symp) ? 1 : punt
  71 extern int nios2_frob_symbol (symbolS * symp);
  72
  73 #define md_cons_align(nbytes) nios2_cons_align (nbytes)
  74 extern void nios2_cons_align (int);
  75
  76 extern void md_convert_frag (bfd * headers, segT sec, fragS * fragP);
  77
  78 /* When relaxing, we need to generate relocations for alignment
  79    directives.  */
  80 #define HANDLE_ALIGN(frag) nios2_handle_align (frag)
  81 extern void nios2_handle_align (fragS *);
  82
  83 #define md_relax_frag nios2_relax_frag
  84 extern long nios2_relax_frag (segT segment, fragS * fragP, long stretch);
  85
  86 #ifdef OBJ_ELF
  87 #define ELF_TC_SPECIAL_SECTIONS \
  88   { ".sdata",   SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL  }, \
  89   { ".sbss",    SHT_NOBITS,     SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL  }, \
  90   { ".lit4",    SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL  }, \
  91   { ".lit8",    SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL  },
  92
  93 /* Processor-specific section directives.  */
  94 #define md_elf_section_letter           nios2_elf_section_letter
  95 extern int nios2_elf_section_letter (int, const char **);
  96 #define md_elf_section_flags            nios2_elf_section_flags
  97 extern flagword nios2_elf_section_flags (flagword, int, int);
  98 #endif
  99
 100 #define GLOBAL_OFFSET_TABLE_NAME       "_GLOBAL_OFFSET_TABLE_"
 101
 102 #define DIFF_EXPR_OK
 103
 104 /* Don't allow the generic code to convert fixups involving the
 105    subtraction of a label in the current section to pc-relative if we
 106    don't have the necessary pc-relative relocation.  */
 107 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG)         \
 108   (!((FIX)->fx_r_type == BFD_RELOC_16                   \
 109      || (FIX)->fx_r_type == BFD_RELOC_NIOS2_LO16        \
 110      || (FIX)->fx_r_type == BFD_RELOC_NIOS2_HIADJ16))
 111
 112 /* Nios2 ABI doesn't have 32-bit PCREL relocation, and, as relocations for
 113    CFI information will be in section other than .text, we can't use PC-biased
 114    relocs.  */
 115 #define CFI_DIFF_EXPR_OK 0
 116
 117 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) nios2_cons (EXP, NBYTES)
 118 extern bfd_reloc_code_real_type nios2_cons (expressionS *exp, int size);
 119
 120 /* We want .cfi_* pseudo-ops for generating unwind info.  */
 121 #define TARGET_USE_CFIPOP 1
 122 #define DWARF2_DEFAULT_RETURN_COLUMN 31
 123 #define DWARF2_CIE_DATA_ALIGNMENT (-4)
 124 #define tc_regname_to_dw2regnum nios2_regname_to_dw2regnum
 125 extern int nios2_regname_to_dw2regnum (char *regname);
 126 #define tc_cfi_frame_initial_instructions  nios2_frame_initial_instructions
 127 extern void nios2_frame_initial_instructions (void);
 128
 129 #define elf_tc_final_processing nios2_elf_final_processing
 130 extern void nios2_elf_final_processing (void);
 131
 132 #endif /* TC_NIOS2 */