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Diffstat (limited to 'gas/config/tc-nios2.h')
| -rw-r--r-- | gas/config/tc-nios2.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/gas/config/tc-nios2.h b/gas/config/tc-nios2.h new file mode 100644 index 0000000..9e69194 --- /dev/null +++ b/gas/config/tc-nios2.h @@ -0,0 +1,125 @@ +/* Definitions for Altera Nios II assembler. + Copyright (C) 2012, 2013 Free Software Foundation, Inc. + Contributed by Nigel Gray (ngray@altera.com). + Contributed by Mentor Graphics, Inc. + + This file is part of GAS, the GNU Assembler. + + GAS is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3, or (at your option) + any later version. + + GAS is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with GAS; see the file COPYING. If not, write to the Free + Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA + 02110-1301, USA. */ + +#ifndef TC_NIOS2 +#define TC_NIOS2 + +/* If unspecified, default to little endian. We can explicitly specify + * a big-endian default by configuring with --target=nios2eb-elf. We + * can override the default with the -EB and -EL options. */ +#ifndef TARGET_BYTES_BIG_ENDIAN +#define TARGET_BYTES_BIG_ENDIAN 0 +#endif + +/* Words are big enough to hold addresses. */ +#define WORKING_DOT_WORD 1 + +#ifdef OBJ_ELF +extern const char *nios2_target_format (void); +#define TARGET_FORMAT nios2_target_format () +#define TARGET_ARCH bfd_arch_nios2 +#endif + +/* A NIOS2 instruction consists of tokens and separator characters + the tokens are things like the instruction name (add, or jmp etc), + the register indices ($5, $7 etc), and constant expressions. The + separator characters are commas, brackets and space. + The instruction name is always separated from other tokens by a space + The maximum number of tokens in an instruction is 5 (the instruction name, + 3 arguments, and a 4th string representing the expected instructin opcode + after assembly. The latter is only used when the assemble is running in + self test mode, otherwise its presence will generate an error. */ +#define NIOS2_MAX_INSN_TOKENS 6 + +/* There are no machine-specific operands so we #define this to nothing. */ +#define md_operand(x) + +/* Function prototypes exported to rest of GAS. */ +extern void md_assemble (char *op_str); +extern void md_end (void); +extern void md_begin (void); + +#define TC_FORCE_RELOCATION(fixp) nios2_force_relocation (fixp) +extern int nios2_force_relocation (struct fix *); + +#define tc_fix_adjustable(fixp) nios2_fix_adjustable (fixp) +extern int nios2_fix_adjustable (struct fix *); + +#define tc_frob_label(lab) nios2_frob_label (lab) +extern void nios2_frob_label (symbolS *); + +#define tc_frob_symbol(symp, punt) punt = nios2_frob_symbol (symp) ? 1 : punt +extern int nios2_frob_symbol (symbolS * symp); + +#define md_cons_align(nbytes) nios2_cons_align (nbytes) +extern void nios2_cons_align (int); + +extern void md_convert_frag (bfd * headers, segT sec, fragS * fragP); + +/* When relaxing, we need to generate relocations for alignment + directives. */ +#define HANDLE_ALIGN(frag) nios2_handle_align (frag) +extern void nios2_handle_align (fragS *); + +#define md_relax_frag nios2_relax_frag +extern long nios2_relax_frag (segT segment, fragS * fragP, long stretch); + +#ifdef OBJ_ELF +#define ELF_TC_SPECIAL_SECTIONS \ + { ".sdata", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL }, \ + { ".sbss", SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL }, \ + { ".lit4", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL }, \ + { ".lit8", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_NIOS2_GPREL }, + +/* Processor-specific section directives. */ +#define md_elf_section_letter nios2_elf_section_letter +extern int nios2_elf_section_letter (int, char **); +#define md_elf_section_flags nios2_elf_section_flags +extern flagword nios2_elf_section_flags (flagword, int, int); +#endif + +#define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_" + +#define DIFF_EXPR_OK + +/* Nios2 ABI doesn't have 32-bit PCREL relocation, and, as relocations for + CFI information will be in section other than .text, we can't use PC-biased + relocs. */ +#define CFI_DIFF_EXPR_OK 0 + +#define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) nios2_cons (EXP, NBYTES) +extern void nios2_cons (expressionS *exp, int size); + +#define TC_CONS_FIX_NEW nios2_cons_fix_new +extern void nios2_cons_fix_new (struct frag *frag, int where, + unsigned int nbytes, struct expressionS *exp); + +/* We want .cfi_* pseudo-ops for generating unwind info. */ +#define TARGET_USE_CFIPOP 1 +#define DWARF2_DEFAULT_RETURN_COLUMN 31 +#define DWARF2_CIE_DATA_ALIGNMENT (-4) +#define tc_regname_to_dw2regnum nios2_regname_to_dw2regnum +extern int nios2_regname_to_dw2regnum (char *regname); +#define tc_cfi_frame_initial_instructions nios2_frame_initial_instructions +extern void nios2_frame_initial_instructions (void); + +#endif /* TC_NIOS2 */ |