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542e1629 RP |
1 | /* tc-i386.h -- Header file for tc-i386.c |
2 | Copyright (C) 1989, 1992 Free Software Foundation. | |
03678945 | 3 | |
a39116f1 | 4 | This file is part of GAS, the GNU Assembler. |
03678945 | 5 | |
a39116f1 RP |
6 | GAS is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
03678945 | 10 | |
a39116f1 RP |
11 | GAS is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
03678945 | 15 | |
a39116f1 RP |
16 | You should have received a copy of the GNU General Public License |
17 | along with GAS; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
03678945 | 20 | #ifndef TC_I386 |
fecd2382 RP |
21 | #define TC_I386 1 |
22 | ||
03678945 KR |
23 | #ifdef TE_LYNX |
24 | #define TARGET_FORMAT "coff-i386-lynx" | |
25 | #endif | |
26 | ||
27 | #ifdef BFD_ASSEMBLER | |
28 | /* This is used to determine relocation types in tc-i386.c. The first | |
29 | parameter is the current relocation type, the second one is the desired | |
30 | type. The idea is that if the original type is already some kind of PIC | |
31 | relocation, we leave it alone, otherwise we give it the desired type */ | |
32 | ||
33 | #define TC_RELOC(X,Y) (((X) != BFD_RELOC_386_PLT32 && \ | |
34 | (X) != BFD_RELOC_386_GOTOFF && \ | |
35 | (X) != BFD_RELOC_386_GOT32 && \ | |
36 | (X) != BFD_RELOC_386_GOTPC) ? Y : X) | |
37 | ||
38 | #define tc_fix_adjustable(X) tc_i386_fix_adjustable(X) | |
39 | ||
40 | /* This is the relocation type for direct references to GLOBAL_OFFSET_TABLE. | |
41 | * It comes up in complicated expressions such as | |
42 | * _GLOBAL_OFFSET_TABLE_+[.-.L284], which cannot be expressed normally with | |
43 | * the regular expressions. The fixup specified here when used at runtime | |
44 | * implies that we should add the address of the GOT to the specified location, | |
45 | * and as a result we have simplified the expression into something we can use. | |
46 | */ | |
47 | #define TC_RELOC_GLOBAL_OFFSET_TABLE BFD_RELOC_386_GOTPC | |
48 | ||
49 | /* This expression evaluates to false if the relocation is for a local object | |
50 | for which we still want to do the relocation at runtime. True if we | |
51 | are willing to perform this relocation while building the .o file. | |
52 | This is only used for pcrel relocations, so GOTOFF does not need to be | |
53 | checked here. I am not sure if some of the others are ever used with | |
54 | pcrel, but it is easier to be safe than sorry. */ | |
55 | ||
56 | #define TC_RELOC_RTSYM_LOC_FIXUP(X) \ | |
57 | ((X) != BFD_RELOC_386_PLT32 && \ | |
58 | (X) != BFD_RELOC_386_GOT32 && \ | |
59 | (X) != BFD_RELOC_386_GOTPC) | |
60 | ||
61 | #define TARGET_ARCH bfd_arch_i386 | |
62 | #define TARGET_BYTES_BIG_ENDIAN 0 | |
a39116f1 | 63 | |
03678945 KR |
64 | #ifdef OBJ_AOUT |
65 | #ifdef TE_NetBSD | |
66 | #define TARGET_FORMAT "a.out-i386-netbsd" | |
67 | #endif | |
68 | #ifdef TE_386BSD | |
69 | #define TARGET_FORMAT "a.out-i386-bsd" | |
70 | #endif | |
71 | #ifdef TE_LINUX | |
72 | #define TARGET_FORMAT "a.out-i386-linux" | |
73 | #endif | |
74 | #ifdef TE_Mach | |
75 | #define TARGET_FORMAT "a.out-mach3" | |
76 | #endif | |
77 | #ifndef TARGET_FORMAT | |
78 | #define TARGET_FORMAT "a.out-i386" | |
79 | #endif | |
80 | #endif /* OBJ_AOUT */ | |
542e1629 | 81 | |
03678945 KR |
82 | #ifdef OBJ_ELF |
83 | #define TARGET_FORMAT "elf32-i386" | |
84 | #endif | |
85 | ||
86 | #else /* ! BFD_ASSEMBLER */ | |
87 | ||
88 | /* COFF STUFF */ | |
89 | ||
90 | #define COFF_MAGIC I386MAGIC | |
91 | #define BFD_ARCH bfd_arch_i386 | |
92 | #define COFF_FLAGS F_AR32WR | |
93 | #define TC_COUNT_RELOC(x) ((x)->fx_addsy /* ||(x)->fx_subsy||(x)->fx_offset */) | |
94 | #define TC_COFF_FIX2RTYPE(fixP) tc_coff_fix2rtype(fixP) | |
95 | extern short tc_coff_fix2rtype (); | |
96 | #define TC_COFF_SIZEMACHDEP(frag) tc_coff_sizemachdep(frag) | |
97 | extern int tc_coff_sizemachdep PARAMS ((fragS *frag)); | |
98 | #define SUB_SEGMENT_ALIGN(SEG) 2 | |
99 | ||
100 | /* Need this for PIC relocations */ | |
101 | #define NEED_FX_R_TYPE | |
102 | ||
103 | #define AOUT_MACHTYPE /* 100 */ 0 | |
104 | #undef REVERSE_SORT_RELOCS | |
105 | ||
106 | #endif /* ! BFD_ASSEMBLER */ | |
107 | ||
108 | #ifdef BFD_ASSEMBLER | |
109 | #define NO_RELOC BFD_RELOC_NONE | |
110 | #else | |
111 | #define NO_RELOC 0 | |
112 | #endif | |
113 | #define tc_coff_symbol_emit_hook(a) ; /* not used */ | |
114 | ||
115 | #ifndef OBJ_AOUT | |
116 | /* Local labels starts with .L */ | |
117 | #define LOCAL_LABEL(name) (name[0] == '.' \ | |
118 | && (name[1] == 'L' || name[1] == 'X' || name[1] == '.')) | |
119 | #define FAKE_LABEL_NAME ".L0\001" | |
120 | #endif | |
121 | #define LOCAL_LABELS_FB | |
122 | ||
123 | #define tc_aout_pre_write_hook(x) {;} /* not used */ | |
124 | #define tc_crawl_symbol_chain(a) {;} /* not used */ | |
125 | #define tc_headers_hook(a) {;} /* not used */ | |
542e1629 | 126 | |
fecd2382 | 127 | #define MAX_OPERANDS 3 /* max operands per insn */ |
03678945 KR |
128 | #define MAX_PREFIXES 5 /* max prefixes per opcode */ |
129 | #define MAX_IMMEDIATE_OPERANDS 2/* max immediates per insn */ | |
130 | #define MAX_MEMORY_OPERANDS 2 /* max memory ref per insn (lcall uses 2) */ | |
131 | ||
542e1629 | 132 | /* we define the syntax here (modulo base,index,scale syntax) */ |
fecd2382 RP |
133 | #define REGISTER_PREFIX '%' |
134 | #define IMMEDIATE_PREFIX '$' | |
135 | #define ABSOLUTE_PREFIX '*' | |
136 | #define PREFIX_SEPERATOR '/' | |
03678945 | 137 | |
fecd2382 | 138 | #define TWO_BYTE_OPCODE_ESCAPE 0x0f |
03678945 KR |
139 | #define NOP_OPCODE (char) 0x90 |
140 | ||
542e1629 | 141 | /* register numbers */ |
fecd2382 RP |
142 | #define EBP_REG_NUM 5 |
143 | #define ESP_REG_NUM 4 | |
03678945 | 144 | |
542e1629 | 145 | /* modrm_byte.regmem for twobyte escape */ |
fecd2382 | 146 | #define ESCAPE_TO_TWO_BYTE_ADDRESSING ESP_REG_NUM |
542e1629 | 147 | /* index_base_byte.index for no index register addressing */ |
fecd2382 | 148 | #define NO_INDEX_REGISTER ESP_REG_NUM |
542e1629 | 149 | /* index_base_byte.base for no base register addressing */ |
fecd2382 | 150 | #define NO_BASE_REGISTER EBP_REG_NUM |
03678945 KR |
151 | |
152 | /* these are the att as opcode suffixes, making movl --> mov, for example */ | |
fecd2382 RP |
153 | #define DWORD_OPCODE_SUFFIX 'l' |
154 | #define WORD_OPCODE_SUFFIX 'w' | |
155 | #define BYTE_OPCODE_SUFFIX 'b' | |
03678945 KR |
156 | |
157 | /* modrm.mode = REGMEM_FIELD_HAS_REG when a register is in there */ | |
158 | #define REGMEM_FIELD_HAS_REG 0x3/* always = 0x3 */ | |
fecd2382 RP |
159 | #define REGMEM_FIELD_HAS_MEM (~REGMEM_FIELD_HAS_REG) |
160 | ||
161 | #define END_OF_INSN '\0' | |
162 | ||
163 | /* | |
a39116f1 RP |
164 | When an operand is read in it is classified by its type. This type includes |
165 | all the possible ways an operand can be used. Thus, '%eax' is both 'register | |
166 | # 0' and 'The Accumulator'. In our language this is expressed by OR'ing | |
167 | 'Reg32' (any 32 bit register) and 'Acc' (the accumulator). | |
168 | Operands are classified so that we can match given operand types with | |
169 | the opcode table in i386-opcode.h. | |
170 | */ | |
fecd2382 RP |
171 | #define Unknown 0x0 |
172 | /* register */ | |
173 | #define Reg8 0x1 /* 8 bit reg */ | |
174 | #define Reg16 0x2 /* 16 bit reg */ | |
175 | #define Reg32 0x4 /* 32 bit reg */ | |
03678945 | 176 | #define Reg (Reg8|Reg16|Reg32) /* gen'l register */ |
fecd2382 RP |
177 | #define WordReg (Reg16|Reg32) /* for push/pop operands */ |
178 | /* immediate */ | |
179 | #define Imm8 0x8 /* 8 bit immediate */ | |
180 | #define Imm8S 0x10 /* 8 bit immediate sign extended */ | |
181 | #define Imm16 0x20 /* 16 bit immediate */ | |
182 | #define Imm32 0x40 /* 32 bit immediate */ | |
03678945 | 183 | #define Imm1 0x80 /* 1 bit immediate */ |
fecd2382 | 184 | #define ImmUnknown Imm32 /* for unknown expressions */ |
03678945 | 185 | #define Imm (Imm8|Imm8S|Imm16|Imm32) /* gen'l immediate */ |
fecd2382 RP |
186 | /* memory */ |
187 | #define Disp8 0x200 /* 8 bit displacement (for jumps) */ | |
188 | #define Disp16 0x400 /* 16 bit displacement */ | |
189 | #define Disp32 0x800 /* 32 bit displacement */ | |
03678945 | 190 | #define Disp (Disp8|Disp16|Disp32) /* General displacement */ |
fecd2382 RP |
191 | #define DispUnknown Disp32 /* for unknown size displacements */ |
192 | #define Mem8 0x1000 | |
193 | #define Mem16 0x2000 | |
194 | #define Mem32 0x4000 | |
195 | #define BaseIndex 0x8000 | |
03678945 | 196 | #define Mem (Disp|Mem8|Mem16|Mem32|BaseIndex) /* General memory */ |
fecd2382 RP |
197 | #define WordMem (Mem16|Mem32|Disp|BaseIndex) |
198 | #define ByteMem (Mem8|Disp|BaseIndex) | |
199 | /* specials */ | |
200 | #define InOutPortReg 0x10000 /* register to hold in/out port addr = dx */ | |
201 | #define ShiftCount 0x20000 /* register to hold shift cound = cl */ | |
202 | #define Control 0x40000 /* Control register */ | |
203 | #define Debug 0x80000 /* Debug register */ | |
03678945 | 204 | #define Test 0x100000 /* Test register */ |
fecd2382 RP |
205 | #define FloatReg 0x200000 /* Float register */ |
206 | #define FloatAcc 0x400000 /* Float stack top %st(0) */ | |
03678945 KR |
207 | #define SReg2 0x800000 /* 2 bit segment register */ |
208 | #define SReg3 0x1000000 /* 3 bit segment register */ | |
209 | #define Acc 0x2000000 /* Accumulator %al or %ax or %eax */ | |
fecd2382 RP |
210 | #define ImplicitRegister (InOutPortReg|ShiftCount|Acc|FloatAcc) |
211 | #define JumpAbsolute 0x4000000 | |
212 | #define Abs8 0x08000000 | |
213 | #define Abs16 0x10000000 | |
214 | #define Abs32 0x20000000 | |
215 | #define Abs (Abs8|Abs16|Abs32) | |
216 | ||
fecd2382 RP |
217 | #define Byte (Reg8|Imm8|Imm8S) |
218 | #define Word (Reg16|Imm16) | |
219 | #define DWord (Reg32|Imm32) | |
220 | ||
fecd2382 | 221 | #define SMALLEST_DISP_TYPE(num) \ |
542e1629 | 222 | fits_in_signed_byte(num) ? (Disp8|Disp32|Abs8|Abs32) : (Disp32|Abs32) |
fecd2382 | 223 | |
03678945 KR |
224 | typedef struct |
225 | { | |
226 | /* instruction name sans width suffix ("mov" for movl insns) */ | |
227 | char *name; | |
228 | ||
229 | /* how many operands */ | |
230 | unsigned int operands; | |
231 | ||
232 | /* base_opcode is the fundamental opcode byte with a optional prefix(es). */ | |
233 | unsigned int base_opcode; | |
234 | ||
235 | /* extension_opcode is the 3 bit extension for group <n> insns. | |
236 | If this template has no extension opcode (the usual case) use None */ | |
237 | unsigned char extension_opcode; | |
238 | #define None 0xff /* If no extension_opcode is possible. */ | |
239 | ||
240 | /* the bits in opcode_modifier are used to generate the final opcode from | |
241 | the base_opcode. These bits also are used to detect alternate forms of | |
242 | the same instruction */ | |
243 | unsigned int opcode_modifier; | |
244 | ||
245 | /* opcode_modifier bits: */ | |
246 | #define W 0x1 /* set if operands are words or dwords */ | |
247 | #define D 0x2 /* D = 0 if Reg --> Regmem; D = 1 if Regmem --> Reg */ | |
248 | /* direction flag for floating insns: MUST BE 0x400 */ | |
fecd2382 | 249 | #define FloatD 0x400 |
03678945 | 250 | /* shorthand */ |
fecd2382 RP |
251 | #define DW (D|W) |
252 | #define ShortForm 0x10 /* register is in low 3 bits of opcode */ | |
253 | #define ShortFormW 0x20 /* ShortForm and W bit is 0x8 */ | |
254 | #define Seg2ShortForm 0x40 /* encoding of load segment reg insns */ | |
255 | #define Seg3ShortForm 0x80 /* fs/gs segment register insns. */ | |
256 | #define Jump 0x100 /* special case for jump insns. */ | |
257 | #define JumpInterSegment 0x200 /* special case for intersegment leaps/calls */ | |
03678945 | 258 | /* 0x400 CANNOT BE USED since it's already used by FloatD above */ |
fecd2382 RP |
259 | #define DONT_USE 0x400 |
260 | #define NoModrm 0x800 | |
261 | #define Modrm 0x1000 | |
262 | #define imulKludge 0x2000 | |
263 | #define JumpByte 0x4000 | |
264 | #define JumpDword 0x8000 | |
265 | #define ReverseRegRegmem 0x10000 | |
03678945 KR |
266 | #define Data16 0x20000 /* needs data prefix if in 32-bit mode */ |
267 | #define Data32 0x40000 /* needs data prefix if in 16-bit mode */ | |
268 | ||
269 | /* (opcode_modifier & COMES_IN_ALL_SIZES) is true if the | |
270 | instuction comes in byte, word, and dword sizes and is encoded into | |
271 | machine code in the canonical way. */ | |
fecd2382 | 272 | #define COMES_IN_ALL_SIZES (W) |
03678945 KR |
273 | |
274 | /* (opcode_modifier & COMES_IN_BOTH_DIRECTIONS) indicates that the | |
275 | source and destination operands can be reversed by setting either | |
276 | the D (for integer insns) or the FloatD (for floating insns) bit | |
277 | in base_opcode. */ | |
fecd2382 | 278 | #define COMES_IN_BOTH_DIRECTIONS (D|FloatD) |
03678945 KR |
279 | |
280 | /* operand_types[i] describes the type of operand i. This is made | |
281 | by OR'ing together all of the possible type masks. (e.g. | |
282 | 'operand_types[i] = Reg|Imm' specifies that operand i can be | |
283 | either a register or an immediate operand */ | |
284 | unsigned int operand_types[3]; | |
285 | } | |
286 | template; | |
fecd2382 RP |
287 | |
288 | /* | |
289 | 'templates' is for grouping together 'template' structures for opcodes | |
290 | of the same name. This is only used for storing the insns in the grand | |
291 | ole hash table of insns. | |
292 | The templates themselves start at START and range up to (but not including) | |
293 | END. | |
a39116f1 | 294 | */ |
03678945 KR |
295 | typedef struct |
296 | { | |
297 | template *start; | |
298 | template *end; | |
299 | } templates; | |
fecd2382 RP |
300 | |
301 | /* these are for register name --> number & type hash lookup */ | |
03678945 KR |
302 | typedef struct |
303 | { | |
304 | char *reg_name; | |
305 | unsigned int reg_type; | |
306 | unsigned int reg_num; | |
307 | } | |
308 | ||
309 | reg_entry; | |
310 | ||
311 | typedef struct | |
312 | { | |
313 | char *seg_name; | |
314 | unsigned int seg_prefix; | |
315 | } | |
fecd2382 | 316 | |
03678945 | 317 | seg_entry; |
fecd2382 RP |
318 | |
319 | /* these are for prefix name --> prefix code hash lookup */ | |
03678945 KR |
320 | typedef struct |
321 | { | |
322 | char *prefix_name; | |
323 | unsigned char prefix_code; | |
324 | } | |
325 | ||
326 | prefix_entry; | |
fecd2382 RP |
327 | |
328 | /* 386 operand encoding bytes: see 386 book for details of this. */ | |
03678945 KR |
329 | typedef struct |
330 | { | |
331 | unsigned regmem:3; /* codes register or memory operand */ | |
332 | unsigned reg:3; /* codes register operand (or extended opcode) */ | |
333 | unsigned mode:2; /* how to interpret regmem & reg */ | |
334 | } | |
335 | ||
336 | modrm_byte; | |
fecd2382 RP |
337 | |
338 | /* 386 opcode byte to code indirect addressing. */ | |
03678945 KR |
339 | typedef struct |
340 | { | |
341 | unsigned base:3; | |
342 | unsigned index:3; | |
343 | unsigned scale:2; | |
344 | } | |
345 | ||
346 | base_index_byte; | |
347 | ||
348 | /* The name of the global offset table generated by the compiler. Allow | |
349 | this to be overridden if need be. */ | |
350 | #ifndef GLOBAL_OFFSET_TABLE_NAME | |
351 | #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_" | |
352 | #endif | |
353 | ||
354 | #ifdef BFD_ASSEMBLER | |
355 | void i386_validate_fix (); | |
356 | #define TC_VALIDATE_FIX(FIXP,SEGTYPE,SKIP) i386_validate_fix(FIXP) | |
357 | #endif | |
358 | ||
359 | #endif /* TC_I386 */ | |
360 | ||
361 | #define md_operand(x) | |
fecd2382 RP |
362 | |
363 | /* end of tc-i386.h */ |