238 lines
9.7 KiB
C
238 lines
9.7 KiB
C
/* This file is tc-avr.h
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Copyright (C) 1999-2016 Free Software Foundation, Inc.
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Contributed by Denis Chertykov <denisc@overta.ru>
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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/* By convention, you should define this macro in the `.h' file. For
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example, `tc-m68k.h' defines `TC_M68K'. You might have to use this
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if it is necessary to add CPU specific code to the object format
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file. */
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#define TC_AVR
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/* This macro is the BFD target name to use when creating the output
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file. This will normally depend upon the `OBJ_FMT' macro. */
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#define TARGET_FORMAT "elf32-avr"
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/* This macro is the BFD architecture to pass to `bfd_set_arch_mach'. */
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#define TARGET_ARCH bfd_arch_avr
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/* This macro is the BFD machine number to pass to
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`bfd_set_arch_mach'. If it is not defined, GAS will use 0. */
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#define TARGET_MACH 0
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/* You should define this macro to be non-zero if the target is big
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endian, and zero if the target is little endian. */
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#define TARGET_BYTES_BIG_ENDIAN 0
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/* If you define this macro, GAS will warn about the use of
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nonstandard escape sequences in a string. */
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#define ONLY_STANDARD_ESCAPES
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#define DIFF_EXPR_OK /* .-foo gets turned into PC relative relocs */
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/* GAS will call this function for any expression that can not be
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recognized. When the function is called, `input_line_pointer'
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will point to the start of the expression. */
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#define md_operand(x)
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typedef struct
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{
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/* Name of the expression modifier allowed with .byte, .word, etc. */
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const char *name;
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/* Only allowed with n bytes of data. */
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int nbytes;
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/* Associated RELOC. */
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bfd_reloc_code_real_type reloc;
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/* Part of the error message. */
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const char *error;
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} exp_mod_data_t;
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extern const exp_mod_data_t exp_mod_data[];
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#define TC_PARSE_CONS_RETURN_TYPE const exp_mod_data_t *
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#define TC_PARSE_CONS_RETURN_NONE exp_mod_data
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/* You may define this macro to parse an expression used in a data
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allocation pseudo-op such as `.word'. You can use this to
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recognize relocation directives that may appear in such directives. */
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#define TC_PARSE_CONS_EXPRESSION(EXPR,N) avr_parse_cons_expression (EXPR, N)
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extern const exp_mod_data_t *avr_parse_cons_expression (expressionS *, int);
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/* You may define this macro to generate a fixup for a data
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allocation pseudo-op. */
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#define TC_CONS_FIX_NEW avr_cons_fix_new
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extern void avr_cons_fix_new (fragS *,int, int, expressionS *,
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const exp_mod_data_t *);
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/* This should just call either `number_to_chars_bigendian' or
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`number_to_chars_littleendian', whichever is appropriate. On
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targets like the MIPS which support options to change the
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endianness, which function to call is a runtime decision. On
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other targets, `md_number_to_chars' can be a simple macro. */
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#define md_number_to_chars number_to_chars_littleendian
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/* `md_short_jump_size'
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`md_long_jump_size'
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`md_create_short_jump'
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`md_create_long_jump'
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If `WORKING_DOT_WORD' is defined, GAS will not do broken word
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processing (*note Broken words::.). Otherwise, you should set
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`md_short_jump_size' to the size of a short jump (a jump that is
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just long enough to jump around a long jmp) and
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`md_long_jump_size' to the size of a long jump (a jump that can go
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anywhere in the function), You should define
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`md_create_short_jump' to create a short jump around a long jump,
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and define `md_create_long_jump' to create a long jump. */
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#define WORKING_DOT_WORD
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/* If you define this macro, it means that `tc_gen_reloc' may return
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multiple relocation entries for a single fixup. In this case, the
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return value of `tc_gen_reloc' is a pointer to a null terminated
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array. */
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#undef RELOC_EXPANSION_POSSIBLE
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/* No shared lib support, so we don't need to ensure externally
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visible symbols can be overridden. */
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#define EXTERN_FORCE_RELOC 0
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/* If defined, this macro allows control over whether fixups for a
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given section will be processed when the linkrelax variable is
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set. Define it to zero and handle things in md_apply_fix instead.*/
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#define TC_LINKRELAX_FIXUP(SEG) 0
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/* If this macro returns non-zero, it guarantees that a relocation will be emitted
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even when the value can be resolved locally. Do that if linkrelax is turned on */
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#define TC_FORCE_RELOCATION(fix) avr_force_relocation (fix)
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#define TC_FORCE_RELOCATION_SUB_SAME(fix, seg) \
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(! SEG_NORMAL (seg) || avr_force_relocation (fix))
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extern int avr_force_relocation (struct fix *);
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/* Values passed to md_apply_fix don't include the symbol value. */
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#define MD_APPLY_SYM_VALUE(FIX) 0
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/* If you define this macro, it should return the offset between the
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address of a PC relative fixup and the position from which the PC
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relative adjustment should be made. On many processors, the base
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of a PC relative instruction is the next instruction, so this
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macro would return the length of an instruction. */
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#define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
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extern long md_pcrel_from_section (struct fix *, segT);
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/* The number of bytes to put into a word in a listing. This affects
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the way the bytes are clumped together in the listing. For
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example, a value of 2 might print `1234 5678' where a value of 1
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would print `12 34 56 78'. The default value is 4. */
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#define LISTING_WORD_SIZE 2
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/* AVR port uses `$' as a logical line separator. */
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#define LEX_DOLLAR 0
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/* An `.lcomm' directive with no explicit alignment parameter will
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use this macro to set P2VAR to the alignment that a request for
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SIZE bytes will have. The alignment is expressed as a power of
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two. If no alignment should take place, the macro definition
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should do nothing. Some targets define a `.bss' directive that is
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also affected by this macro. The default definition will set
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P2VAR to the truncated power of two of sizes up to eight bytes. */
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#define TC_IMPLICIT_LCOMM_ALIGNMENT(SIZE, P2VAR) (P2VAR) = 0
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/* We don't want gas to fixup the following program memory related relocations.
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We will need them in case that we want to do linker relaxation.
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We could in principle keep these fixups in gas when not relaxing.
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However, there is no serious performance penalty when making the linker
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make the fixup work. Check also that fx_addsy is not NULL, in order to make
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sure that the fixup refers to some sort of label. */
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#define TC_VALIDATE_FIX(FIXP,SEG,SKIP) \
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if ( (FIXP->fx_r_type == BFD_RELOC_AVR_7_PCREL \
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|| FIXP->fx_r_type == BFD_RELOC_AVR_13_PCREL \
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|| FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_PM \
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|| FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_GS \
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|| FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_PM \
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|| FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_GS \
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|| FIXP->fx_r_type == BFD_RELOC_AVR_HH8_LDI_PM \
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|| FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_PM_NEG \
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|| FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_PM_NEG \
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|| FIXP->fx_r_type == BFD_RELOC_AVR_HH8_LDI_PM_NEG \
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|| FIXP->fx_r_type == BFD_RELOC_AVR_8_LO \
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|| FIXP->fx_r_type == BFD_RELOC_AVR_8_HI \
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|| FIXP->fx_r_type == BFD_RELOC_AVR_8_HLO \
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|| FIXP->fx_r_type == BFD_RELOC_AVR_16_PM) \
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&& FIXP->fx_addsy != NULL \
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&& FIXP->fx_subsy == NULL) \
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{ \
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symbol_mark_used_in_reloc (FIXP->fx_addsy); \
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goto SKIP; \
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}
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/* This macro is evaluated for any fixup with a fx_subsy that
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fixup_segment cannot reduce to a number. If the macro returns
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false an error will be reported. */
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#define TC_VALIDATE_FIX_SUB(fix, seg) avr_validate_fix_sub (fix)
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extern int avr_validate_fix_sub (struct fix *);
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/* This target is buggy, and sets fix size too large. */
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#define TC_FX_SIZE_SLACK(FIX) 2
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/* AVR instructions are 2 or 4 bytes long. */
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#define DWARF2_LINE_MIN_INSN_LENGTH 2
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/* 32 bits pseudo-addresses are used on AVR. */
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#define DWARF2_ADDR_SIZE(bfd) 4
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/* Enable cfi directives. */
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#define TARGET_USE_CFIPOP 1
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/* The stack grows down, and is only byte aligned. */
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#define DWARF2_CIE_DATA_ALIGNMENT -1
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/* Define the column that represents the PC. */
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#define DWARF2_DEFAULT_RETURN_COLUMN 36
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/* Define a hook to setup initial CFI state. */
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extern void tc_cfi_frame_initial_instructions (void);
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#define tc_cfi_frame_initial_instructions tc_cfi_frame_initial_instructions
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/* The difference between same-section symbols may be affected by linker
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relaxation, so do not resolve such expressions in the assembler. */
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#define md_allow_local_subtract(l,r,s) avr_allow_local_subtract (l, r, s)
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extern bfd_boolean avr_allow_local_subtract (expressionS *, expressionS *, segT);
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#define elf_tc_final_processing avr_elf_final_processing
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extern void avr_elf_final_processing (void);
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#define md_post_relax_hook avr_post_relax_hook ()
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extern void avr_post_relax_hook (void);
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#define HANDLE_ALIGN(fragP) avr_handle_align (fragP)
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extern void avr_handle_align (fragS *fragP);
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struct avr_frag_data
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{
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unsigned is_org : 1;
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unsigned is_align : 1;
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unsigned has_fill : 1;
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char fill;
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offsetT alignment;
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};
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#define TC_FRAG_TYPE struct avr_frag_data
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