1 /* This file is tc-avr.h
2 Copyright 1999, 2000, 2001, 2002 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 2, 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, 59 Temple Place - Suite 330, Boston, MA
24 #error AVR support requires BFD_ASSEMBLER
27 /* By convention, you should define this macro in the `.h' file. For
28 example, `tc-m68k.h' defines `TC_M68K'. You might have to use this
29 if it is necessary to add CPU specific code to the object format
33 /* This macro is the BFD target name to use when creating the output
34 file. This will normally depend upon the `OBJ_FMT' macro. */
35 #define TARGET_FORMAT "elf32-avr"
37 /* This macro is the BFD architecture to pass to `bfd_set_arch_mach'. */
38 #define TARGET_ARCH bfd_arch_avr
40 /* This macro is the BFD machine number to pass to
41 `bfd_set_arch_mach'. If it is not defined, GAS will use 0. */
44 /* You should define this macro to be non-zero if the target is big
45 endian, and zero if the target is little endian. */
46 #define TARGET_BYTES_BIG_ENDIAN 0
48 /* If you define this macro, GAS will warn about the use of
49 nonstandard escape sequences in a string. */
50 #define ONLY_STANDARD_ESCAPES
52 /* GAS will call this function for any expression that can not be
53 recognized. When the function is called, `input_line_pointer'
54 will point to the start of the expression. */
57 /* You may define this macro to parse an expression used in a data
58 allocation pseudo-op such as `.word'. You can use this to
59 recognize relocation directives that may appear in such directives. */
60 #define TC_PARSE_CONS_EXPRESSION(EXPR,N) avr_parse_cons_expression (EXPR,N)
61 void avr_parse_cons_expression (expressionS
*exp
, int nbytes
);
63 /* You may define this macro to generate a fixup for a data
64 allocation pseudo-op. */
65 #define TC_CONS_FIX_NEW(FRAG,WHERE,N,EXP) avr_cons_fix_new(FRAG,WHERE,N,EXP)
66 void avr_cons_fix_new(fragS
*frag
,int where
, int nbytes
, expressionS
*exp
);
68 /* This should just call either `number_to_chars_bigendian' or
69 `number_to_chars_littleendian', whichever is appropriate. On
70 targets like the MIPS which support options to change the
71 endianness, which function to call is a runtime decision. On
72 other targets, `md_number_to_chars' can be a simple macro. */
73 #define md_number_to_chars number_to_chars_littleendian
75 /* `md_short_jump_size'
77 `md_create_short_jump'
79 If `WORKING_DOT_WORD' is defined, GAS will not do broken word
80 processing (*note Broken words::.). Otherwise, you should set
81 `md_short_jump_size' to the size of a short jump (a jump that is
82 just long enough to jump around a long jmp) and
83 `md_long_jump_size' to the size of a long jump (a jump that can go
84 anywhere in the function), You should define
85 `md_create_short_jump' to create a short jump around a long jump,
86 and define `md_create_long_jump' to create a long jump. */
87 #define WORKING_DOT_WORD
89 /* If you define this macro, it means that `tc_gen_reloc' may return
90 multiple relocation entries for a single fixup. In this case, the
91 return value of `tc_gen_reloc' is a pointer to a null terminated
93 #undef RELOC_EXPANSION_POSSIBLE
95 /* No shared lib support, so we don't need to ensure externally
96 visible symbols can be overridden. */
97 #define EXTERN_FORCE_RELOC 0
99 /* Values passed to md_apply_fix3 don't include the symbol value. */
100 #define MD_APPLY_SYM_VALUE(FIX) 0
102 /* If you define this macro, it should return the offset between the
103 address of a PC relative fixup and the position from which the PC
104 relative adjustment should be made. On many processors, the base
105 of a PC relative instruction is the next instruction, so this
106 macro would return the length of an instruction. */
107 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section(FIX, SEC)
108 extern long md_pcrel_from_section
PARAMS ((struct fix
*, segT
));
110 /* The number of bytes to put into a word in a listing. This affects
111 the way the bytes are clumped together in the listing. For
112 example, a value of 2 might print `1234 5678' where a value of 1
113 would print `12 34 56 78'. The default value is 4. */
114 #define LISTING_WORD_SIZE 2
116 /* AVR port uses `$' as a logical line separator */
119 /* An `.lcomm' directive with no explicit alignment parameter will
120 use this macro to set P2VAR to the alignment that a request for
121 SIZE bytes will have. The alignment is expressed as a power of
122 two. If no alignment should take place, the macro definition
123 should do nothing. Some targets define a `.bss' directive that is
124 also affected by this macro. The default definition will set
125 P2VAR to the truncated power of two of sizes up to eight bytes. */
126 #define TC_IMPLICIT_LCOMM_ALIGNMENT(SIZE, P2VAR) (P2VAR) = 0
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