1 /* This file is tc-avr.h
2 Copyright (C) 1999-2014 Free Software Foundation, Inc.
4 Contributed by Denis Chertykov <denisc@overta.ru>
6 This file is part of GAS, the GNU Assembler.
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)
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.
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
23 /* By convention, you should define this macro in the `.h' file. For
24 example, `tc-m68k.h' defines `TC_M68K'. You might have to use this
25 if it is necessary to add CPU specific code to the object format
29 /* This macro is the BFD target name to use when creating the output
30 file. This will normally depend upon the `OBJ_FMT' macro. */
31 #define TARGET_FORMAT "elf32-avr"
33 /* This macro is the BFD architecture to pass to `bfd_set_arch_mach'. */
34 #define TARGET_ARCH bfd_arch_avr
36 /* This macro is the BFD machine number to pass to
37 `bfd_set_arch_mach'. If it is not defined, GAS will use 0. */
40 /* You should define this macro to be non-zero if the target is big
41 endian, and zero if the target is little endian. */
42 #define TARGET_BYTES_BIG_ENDIAN 0
44 /* If you define this macro, GAS will warn about the use of
45 nonstandard escape sequences in a string. */
46 #define ONLY_STANDARD_ESCAPES
48 /* GAS will call this function for any expression that can not be
49 recognized. When the function is called, `input_line_pointer'
50 will point to the start of the expression. */
55 /* Name of the expression modifier allowed with .byte, .word, etc. */
58 /* Only allowed with n bytes of data. */
61 /* Associated RELOC. */
62 bfd_reloc_code_real_type reloc
;
64 /* Part of the error message. */
68 extern const exp_mod_data_t exp_mod_data
[];
69 #define TC_PARSE_CONS_RETURN_TYPE const exp_mod_data_t *
70 #define TC_PARSE_CONS_RETURN_NONE exp_mod_data
72 /* You may define this macro to parse an expression used in a data
73 allocation pseudo-op such as `.word'. You can use this to
74 recognize relocation directives that may appear in such directives. */
75 #define TC_PARSE_CONS_EXPRESSION(EXPR,N) avr_parse_cons_expression (EXPR, N)
76 extern const exp_mod_data_t
*avr_parse_cons_expression (expressionS
*, int);
78 /* You may define this macro to generate a fixup for a data
79 allocation pseudo-op. */
80 #define TC_CONS_FIX_NEW avr_cons_fix_new
81 extern void avr_cons_fix_new (fragS
*,int, int, expressionS
*,
82 const exp_mod_data_t
*);
84 /* This should just call either `number_to_chars_bigendian' or
85 `number_to_chars_littleendian', whichever is appropriate. On
86 targets like the MIPS which support options to change the
87 endianness, which function to call is a runtime decision. On
88 other targets, `md_number_to_chars' can be a simple macro. */
89 #define md_number_to_chars number_to_chars_littleendian
91 /* `md_short_jump_size'
93 `md_create_short_jump'
95 If `WORKING_DOT_WORD' is defined, GAS will not do broken word
96 processing (*note Broken words::.). Otherwise, you should set
97 `md_short_jump_size' to the size of a short jump (a jump that is
98 just long enough to jump around a long jmp) and
99 `md_long_jump_size' to the size of a long jump (a jump that can go
100 anywhere in the function), You should define
101 `md_create_short_jump' to create a short jump around a long jump,
102 and define `md_create_long_jump' to create a long jump. */
103 #define WORKING_DOT_WORD
105 /* If you define this macro, it means that `tc_gen_reloc' may return
106 multiple relocation entries for a single fixup. In this case, the
107 return value of `tc_gen_reloc' is a pointer to a null terminated
109 #undef RELOC_EXPANSION_POSSIBLE
111 /* No shared lib support, so we don't need to ensure externally
112 visible symbols can be overridden. */
113 #define EXTERN_FORCE_RELOC 0
115 /* Values passed to md_apply_fix don't include the symbol value. */
116 #define MD_APPLY_SYM_VALUE(FIX) 0
118 /* If you define this macro, it should return the offset between the
119 address of a PC relative fixup and the position from which the PC
120 relative adjustment should be made. On many processors, the base
121 of a PC relative instruction is the next instruction, so this
122 macro would return the length of an instruction. */
123 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
124 extern long md_pcrel_from_section (struct fix
*, segT
);
126 /* The number of bytes to put into a word in a listing. This affects
127 the way the bytes are clumped together in the listing. For
128 example, a value of 2 might print `1234 5678' where a value of 1
129 would print `12 34 56 78'. The default value is 4. */
130 #define LISTING_WORD_SIZE 2
132 /* AVR port uses `$' as a logical line separator. */
135 /* An `.lcomm' directive with no explicit alignment parameter will
136 use this macro to set P2VAR to the alignment that a request for
137 SIZE bytes will have. The alignment is expressed as a power of
138 two. If no alignment should take place, the macro definition
139 should do nothing. Some targets define a `.bss' directive that is
140 also affected by this macro. The default definition will set
141 P2VAR to the truncated power of two of sizes up to eight bytes. */
142 #define TC_IMPLICIT_LCOMM_ALIGNMENT(SIZE, P2VAR) (P2VAR) = 0
144 /* We don't want gas to fixup the following program memory related relocations.
145 We will need them in case that we want to do linker relaxation.
146 We could in principle keep these fixups in gas when not relaxing.
147 However, there is no serious performance penalty when making the linker
148 make the fixup work. Check also that fx_addsy is not NULL, in order to make
149 sure that the fixup refers to some sort of label. */
150 #define TC_VALIDATE_FIX(FIXP,SEG,SKIP) \
151 if ( (FIXP->fx_r_type == BFD_RELOC_AVR_7_PCREL \
152 || FIXP->fx_r_type == BFD_RELOC_AVR_13_PCREL \
153 || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_PM \
154 || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_GS \
155 || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_PM \
156 || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_GS \
157 || FIXP->fx_r_type == BFD_RELOC_AVR_HH8_LDI_PM \
158 || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_PM_NEG \
159 || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_PM_NEG \
160 || FIXP->fx_r_type == BFD_RELOC_AVR_HH8_LDI_PM_NEG \
161 || FIXP->fx_r_type == BFD_RELOC_AVR_8_LO \
162 || FIXP->fx_r_type == BFD_RELOC_AVR_8_HI \
163 || FIXP->fx_r_type == BFD_RELOC_AVR_8_HLO \
164 || FIXP->fx_r_type == BFD_RELOC_AVR_16_PM) \
165 && FIXP->fx_addsy != NULL \
166 && FIXP->fx_subsy == NULL) \
168 symbol_mark_used_in_reloc (FIXP->fx_addsy); \
172 /* This target is buggy, and sets fix size too large. */
173 #define TC_FX_SIZE_SLACK(FIX) 2
175 /* AVR instructions are 2 or 4 bytes long. */
176 #define DWARF2_LINE_MIN_INSN_LENGTH 2
178 /* 32 bits pseudo-addresses are used on AVR. */
179 #define DWARF2_ADDR_SIZE(bfd) 4
181 /* Enable cfi directives. */
182 #define TARGET_USE_CFIPOP 1
184 /* The stack grows down, and is only byte aligned. */
185 #define DWARF2_CIE_DATA_ALIGNMENT -1
187 /* Define the column that represents the PC. */
188 #define DWARF2_DEFAULT_RETURN_COLUMN 36
190 /* Define a hook to setup initial CFI state. */
191 extern void tc_cfi_frame_initial_instructions (void);
192 #define tc_cfi_frame_initial_instructions tc_cfi_frame_initial_instructions