1 /* This file is tc-avr.h
2 Copyright 1999, 2000, 2001, 2002, 2005, 2006, 2007
3 Free Software Foundation, Inc.
5 Contributed by Denis Chertykov <denisc@overta.ru>
7 This file is part of GAS, the GNU Assembler.
9 GAS is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GAS is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GAS; see the file COPYING. If not, write to the Free
21 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
24 /* By convention, you should define this macro in the `.h' file. For
25 example, `tc-m68k.h' defines `TC_M68K'. You might have to use this
26 if it is necessary to add CPU specific code to the object format
30 /* This macro is the BFD target name to use when creating the output
31 file. This will normally depend upon the `OBJ_FMT' macro. */
32 #define TARGET_FORMAT "elf32-avr"
34 /* This macro is the BFD architecture to pass to `bfd_set_arch_mach'. */
35 #define TARGET_ARCH bfd_arch_avr
37 /* This macro is the BFD machine number to pass to
38 `bfd_set_arch_mach'. If it is not defined, GAS will use 0. */
41 /* You should define this macro to be non-zero if the target is big
42 endian, and zero if the target is little endian. */
43 #define TARGET_BYTES_BIG_ENDIAN 0
45 /* If you define this macro, GAS will warn about the use of
46 nonstandard escape sequences in a string. */
47 #define ONLY_STANDARD_ESCAPES
49 /* GAS will call this function for any expression that can not be
50 recognized. When the function is called, `input_line_pointer'
51 will point to the start of the expression. */
54 /* You may define this macro to parse an expression used in a data
55 allocation pseudo-op such as `.word'. You can use this to
56 recognize relocation directives that may appear in such directives. */
57 #define TC_PARSE_CONS_EXPRESSION(EXPR,N) avr_parse_cons_expression (EXPR, N)
58 extern void avr_parse_cons_expression (expressionS
*, int);
60 /* You may define this macro to generate a fixup for a data
61 allocation pseudo-op. */
62 #define TC_CONS_FIX_NEW(FRAG,WHERE,N,EXP) avr_cons_fix_new (FRAG, WHERE, N, EXP)
63 extern void avr_cons_fix_new (fragS
*,int, int, expressionS
*);
65 /* This should just call either `number_to_chars_bigendian' or
66 `number_to_chars_littleendian', whichever is appropriate. On
67 targets like the MIPS which support options to change the
68 endianness, which function to call is a runtime decision. On
69 other targets, `md_number_to_chars' can be a simple macro. */
70 #define md_number_to_chars number_to_chars_littleendian
72 /* `md_short_jump_size'
74 `md_create_short_jump'
76 If `WORKING_DOT_WORD' is defined, GAS will not do broken word
77 processing (*note Broken words::.). Otherwise, you should set
78 `md_short_jump_size' to the size of a short jump (a jump that is
79 just long enough to jump around a long jmp) and
80 `md_long_jump_size' to the size of a long jump (a jump that can go
81 anywhere in the function), You should define
82 `md_create_short_jump' to create a short jump around a long jump,
83 and define `md_create_long_jump' to create a long jump. */
84 #define WORKING_DOT_WORD
86 /* If you define this macro, it means that `tc_gen_reloc' may return
87 multiple relocation entries for a single fixup. In this case, the
88 return value of `tc_gen_reloc' is a pointer to a null terminated
90 #undef RELOC_EXPANSION_POSSIBLE
92 /* No shared lib support, so we don't need to ensure externally
93 visible symbols can be overridden. */
94 #define EXTERN_FORCE_RELOC 0
96 /* Values passed to md_apply_fix don't include the symbol value. */
97 #define MD_APPLY_SYM_VALUE(FIX) 0
99 /* If you define this macro, it should return the offset between the
100 address of a PC relative fixup and the position from which the PC
101 relative adjustment should be made. On many processors, the base
102 of a PC relative instruction is the next instruction, so this
103 macro would return the length of an instruction. */
104 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
105 extern long md_pcrel_from_section (struct fix
*, segT
);
107 /* The number of bytes to put into a word in a listing. This affects
108 the way the bytes are clumped together in the listing. For
109 example, a value of 2 might print `1234 5678' where a value of 1
110 would print `12 34 56 78'. The default value is 4. */
111 #define LISTING_WORD_SIZE 2
113 /* AVR port uses `$' as a logical line separator. */
116 /* An `.lcomm' directive with no explicit alignment parameter will
117 use this macro to set P2VAR to the alignment that a request for
118 SIZE bytes will have. The alignment is expressed as a power of
119 two. If no alignment should take place, the macro definition
120 should do nothing. Some targets define a `.bss' directive that is
121 also affected by this macro. The default definition will set
122 P2VAR to the truncated power of two of sizes up to eight bytes. */
123 #define TC_IMPLICIT_LCOMM_ALIGNMENT(SIZE, P2VAR) (P2VAR) = 0
125 /* We don't want gas to fixup the following program memory related relocations.
126 We will need them in case that we want to do linker relaxation.
127 We could in principle keep these fixups in gas when not relaxing.
128 However, there is no serious performance penilty when making the linker
129 make the fixup work. Check also that fx_addsy is not NULL, in order to make
130 sure that the fixup refers to some sort of lable. */
131 #define TC_VALIDATE_FIX(FIXP,SEG,SKIP) \
132 if ( (FIXP->fx_r_type == BFD_RELOC_AVR_7_PCREL \
133 || FIXP->fx_r_type == BFD_RELOC_AVR_13_PCREL \
134 || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_PM \
135 || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_GS \
136 || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_PM \
137 || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_GS \
138 || FIXP->fx_r_type == BFD_RELOC_AVR_HH8_LDI_PM \
139 || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_PM_NEG \
140 || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_PM_NEG \
141 || FIXP->fx_r_type == BFD_RELOC_AVR_HH8_LDI_PM_NEG \
142 || FIXP->fx_r_type == BFD_RELOC_AVR_16_PM) \
143 && (FIXP->fx_addsy)) \
148 /* This target is buggy, and sets fix size too large. */
149 #define TC_FX_SIZE_SLACK(FIX) 2
151 /* AVR instructions are 2 or 4 bytes long. */
152 #define DWARF2_LINE_MIN_INSN_LENGTH 2
154 /* 32 bits pseudo-addresses are used on AVR. */
155 #define DWARF2_ADDR_SIZE(bfd) 4
157 /* Enable cfi directives. */
158 #define TARGET_USE_CFIPOP 1
160 /* The stack grows down, and is only byte aligned. */
161 #define DWARF2_CIE_DATA_ALIGNMENT -1
163 /* Define the column that represents the PC. */
164 #define DWARF2_DEFAULT_RETURN_COLUMN 36
166 /* Define a hook to setup initial CFI state. */
167 extern void tc_cfi_frame_initial_instructions (void);
168 #define tc_cfi_frame_initial_instructions tc_cfi_frame_initial_instructions
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