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252b5132 | 1 | /* tc-i960.h - Basic 80960 instruction formats. |
bedf545c | 2 | Copyright (C) 1989, 90, 91, 92, 93, 94, 95, 96, 97, 98, 1999 |
252b5132 RH |
3 | Free Software Foundation, Inc. |
4 | ||
5 | This file is part of GAS, the GNU Assembler. | |
6 | ||
7 | GAS is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as | |
9 | published by the Free Software Foundation; either version 2, | |
10 | or (at your option) any later version. | |
11 | ||
12 | GAS is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
15 | the GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GAS; see the file COPYING. If not, write to the Free | |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
21 | ||
22 | #ifndef TC_I960 | |
23 | #define TC_I960 1 | |
24 | ||
bedf545c ILT |
25 | #ifdef OBJ_ELF |
26 | #define TARGET_FORMAT "elf32-i960" | |
27 | #define TARGET_ARCH bfd_arch_i960 | |
28 | #endif | |
29 | ||
252b5132 RH |
30 | #define TARGET_BYTES_BIG_ENDIAN 0 |
31 | ||
32 | #define WORKING_DOT_WORD | |
33 | ||
34 | /* | |
35 | * The 'COJ' instructions are actually COBR instructions with the 'b' in | |
36 | * the mnemonic replaced by a 'j'; they are ALWAYS "de-optimized" if necessary: | |
37 | * if the displacement will not fit in 13 bits, the assembler will replace them | |
38 | * with the corresponding compare and branch instructions. | |
39 | * | |
40 | * All of the 'MEMn' instructions are the same format; the 'n' in the name | |
41 | * indicates the default index scale factor (the size of the datum operated on). | |
42 | * | |
43 | * The FBRA formats are not actually an instruction format. They are the | |
44 | * "convenience directives" for branching on floating-point comparisons, | |
45 | * each of which generates 2 instructions (a 'bno' and one other branch). | |
46 | * | |
47 | * The CALLJ format is not actually an instruction format. It indicates that | |
48 | * the instruction generated (a CTRL-format 'call') should have its relocation | |
49 | * specially flagged for link-time replacement with a 'bal' or 'calls' if | |
50 | * appropriate. | |
51 | */ | |
52 | ||
53 | /* tailor gas */ | |
54 | #define SYMBOLS_NEED_BACKPOINTERS | |
55 | #define LOCAL_LABELS_FB 1 | |
56 | #define BITFIELD_CONS_EXPRESSIONS | |
57 | ||
58 | /* tailor the coff format */ | |
59 | #define BFD_ARCH bfd_arch_i960 | |
60 | #define COFF_FLAGS F_AR32WR | |
61 | #define COFF_MAGIC I960ROMAGIC | |
62 | #define OBJ_COFF_SECTION_HEADER_HAS_ALIGNMENT | |
63 | #define OBJ_COFF_MAX_AUXENTRIES (2) | |
64 | #define TC_COUNT_RELOC(FIXP) (!(FIXP)->fx_done) | |
65 | #define TC_COFF_FIX2RTYPE(FIXP) tc_coff_fix2rtype(FIXP) | |
66 | #define TC_COFF_SIZEMACHDEP(FRAGP) tc_coff_sizemachdep(FRAGP) | |
67 | #define TC_COFF_SET_MACHINE(HDRS) tc_headers_hook (HDRS) | |
68 | extern void tc_headers_hook (); | |
69 | extern short tc_coff_fix2rtype (); | |
70 | extern int tc_coff_sizemachdep (); | |
71 | ||
72 | /* MEANING OF 'n_other' in the symbol record. | |
73 | * | |
74 | * If non-zero, the 'n_other' fields indicates either a leaf procedure or | |
75 | * a system procedure, as follows: | |
76 | * | |
77 | * 1 <= n_other <= 32 : | |
78 | * The symbol is the entry point to a system procedure. | |
79 | * 'n_value' is the address of the entry, as for any other | |
80 | * procedure. The system procedure number (which can be used in | |
81 | * a 'calls' instruction) is (n_other-1). These entries come from | |
82 | * '.sysproc' directives. | |
83 | * | |
84 | * n_other == N_CALLNAME | |
85 | * the symbol is the 'call' entry point to a leaf procedure. | |
86 | * The *next* symbol in the symbol table must be the corresponding | |
87 | * 'bal' entry point to the procedure (see following). These | |
88 | * entries come from '.leafproc' directives in which two different | |
89 | * symbols are specified (the first one is represented here). | |
90 | * | |
91 | * | |
92 | * n_other == N_BALNAME | |
93 | * the symbol is the 'bal' entry point to a leaf procedure. | |
94 | * These entries result from '.leafproc' directives in which only | |
95 | * one symbol is specified, or in which the same symbol is | |
96 | * specified twice. | |
97 | * | |
98 | * Note that an N_CALLNAME entry *must* have a corresponding N_BALNAME entry, | |
99 | * but not every N_BALNAME entry must have an N_CALLNAME entry. | |
100 | */ | |
101 | #define N_CALLNAME ((char)-1) | |
102 | #define N_BALNAME ((char)-2) | |
103 | ||
104 | /* i960 uses a custom relocation record. */ | |
105 | ||
106 | /* let obj-aout.h know */ | |
107 | #define CUSTOM_RELOC_FORMAT 1 | |
108 | /* let aout_gnu.h know */ | |
109 | #define N_RELOCATION_INFO_DECLARED 1 | |
110 | struct relocation_info | |
111 | { | |
112 | int r_address; /* File address of item to be relocated */ | |
113 | unsigned | |
114 | r_index:24, /* Index of symbol on which relocation is based*/ | |
115 | r_pcrel:1, /* 1 => relocate PC-relative; else absolute | |
116 | * On i960, pc-relative implies 24-bit | |
117 | * address, absolute implies 32-bit. | |
118 | */ | |
119 | r_length:2, /* Number of bytes to relocate: | |
120 | * 0 => 1 byte | |
121 | * 1 => 2 bytes | |
122 | * 2 => 4 bytes -- only value used for i960 | |
123 | */ | |
124 | r_extern:1, r_bsr:1, /* Something for the GNU NS32K assembler */ | |
125 | r_disp:1, /* Something for the GNU NS32K assembler */ | |
126 | r_callj:1, /* 1 if relocation target is an i960 'callj' */ | |
127 | nuthin:1; /* Unused */ | |
128 | }; | |
129 | ||
130 | #ifdef OBJ_COFF | |
131 | ||
132 | /* We store the bal information in the sy_tc field. */ | |
49309057 | 133 | #define TC_SYMFIELD_TYPE symbolS * |
252b5132 RH |
134 | |
135 | #define TC_ADJUST_RELOC_COUNT(FIXP,COUNT) \ | |
136 | { fixS *tcfixp = (FIXP); \ | |
137 | for (;tcfixp;tcfixp=tcfixp->fx_next) \ | |
138 | if (tcfixp->fx_tcbit && tcfixp->fx_addsy != 0) \ | |
139 | ++(COUNT); \ | |
140 | } | |
141 | #endif | |
142 | ||
49309057 | 143 | extern int i960_validate_fix PARAMS ((struct fix *, segT, symbolS **)); |
252b5132 RH |
144 | #define TC_VALIDATE_FIX(FIXP,SEGTYPE,LABEL) \ |
145 | if (i960_validate_fix (FIXP, SEGTYPE, &add_symbolP) != 0) goto LABEL | |
146 | ||
bedf545c ILT |
147 | #ifdef OBJ_ELF |
148 | #define TC_RELOC_RTSYM_LOC_FIXUP(FIX) \ | |
149 | ((FIX)->fx_addsy == NULL \ | |
150 | || (! S_IS_EXTERNAL ((FIX)->fx_addsy) \ | |
151 | && ! S_IS_WEAK ((FIX)->fx_addsy) \ | |
152 | && S_IS_DEFINED ((FIX)->fx_addsy) \ | |
153 | && ! S_IS_COMMON ((FIX)->fx_addsy))) | |
154 | #endif | |
155 | ||
156 | #ifndef OBJ_ELF | |
252b5132 | 157 | #define tc_fix_adjustable(FIXP) ((FIXP)->fx_bsr == 0) |
bedf545c ILT |
158 | #else |
159 | #define tc_fix_adjustable(FIXP) \ | |
160 | ((FIXP)->fx_bsr == 0 \ | |
161 | && ! S_IS_EXTERNAL ((FIXP)->fx_addsy) \ | |
162 | && ! S_IS_WEAK ((FIXP)->fx_addsy)) | |
163 | #endif | |
252b5132 RH |
164 | |
165 | extern void brtab_emit PARAMS ((void)); | |
166 | #define md_end() brtab_emit () | |
167 | ||
168 | extern void reloc_callj (); | |
169 | ||
49309057 | 170 | extern void tc_set_bal_of_call PARAMS ((symbolS *, symbolS *)); |
252b5132 | 171 | |
49309057 | 172 | extern struct symbol *tc_get_bal_of_call PARAMS ((symbolS *)); |
252b5132 RH |
173 | |
174 | extern void i960_handle_align (); | |
175 | #define HANDLE_ALIGN(FRAG) i960_handle_align (FRAG) | |
176 | #define NEED_FX_R_TYPE | |
177 | #define NO_RELOC -1 | |
178 | ||
179 | #define md_operand(x) | |
180 | ||
181 | extern const struct relax_type md_relax_table[]; | |
182 | #define TC_GENERIC_RELAX_TABLE md_relax_table | |
183 | ||
184 | #define LINKER_RELAXING_SHRINKS_ONLY | |
185 | ||
186 | #define TC_FIX_TYPE struct { unsigned bsr : 1; } | |
187 | #define fx_bsr tc_fix_data.bsr | |
188 | #define TC_INIT_FIX_DATA(F) ((F)->tc_fix_data.bsr = 0) | |
189 | ||
190 | #endif | |
191 | ||
192 | /* end of tc-i960.h */ |