1 /* tc-i386.h -- Header file for tc-i386.c
2 Copyright (C) 1989, 92, 93, 94, 95, 96, 1997 Free Software Foundation.
4 This file is part of GAS, the GNU Assembler.
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)
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.
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 the Free
18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
24 #define TARGET_BYTES_BIG_ENDIAN 0
27 #define TARGET_FORMAT "coff-i386-lynx"
31 /* This is used to determine relocation types in tc-i386.c. The first
32 parameter is the current relocation type, the second one is the desired
33 type. The idea is that if the original type is already some kind of PIC
34 relocation, we leave it alone, otherwise we give it the desired type */
36 #define TC_RELOC(X,Y) (((X) != BFD_RELOC_386_PLT32 && \
37 (X) != BFD_RELOC_386_GOTOFF && \
38 (X) != BFD_RELOC_386_GOT32 && \
39 (X) != BFD_RELOC_386_GOTPC) ? Y : X)
41 #define tc_fix_adjustable(X) tc_i386_fix_adjustable(X)
43 /* This is the relocation type for direct references to GLOBAL_OFFSET_TABLE.
44 * It comes up in complicated expressions such as
45 * _GLOBAL_OFFSET_TABLE_+[.-.L284], which cannot be expressed normally with
46 * the regular expressions. The fixup specified here when used at runtime
47 * implies that we should add the address of the GOT to the specified location,
48 * and as a result we have simplified the expression into something we can use.
50 #define TC_RELOC_GLOBAL_OFFSET_TABLE BFD_RELOC_386_GOTPC
52 /* This expression evaluates to false if the relocation is for a local object
53 for which we still want to do the relocation at runtime. True if we
54 are willing to perform this relocation while building the .o file.
55 This is only used for pcrel relocations, so GOTOFF does not need to be
56 checked here. I am not sure if some of the others are ever used with
57 pcrel, but it is easier to be safe than sorry. */
59 #define TC_RELOC_RTSYM_LOC_FIXUP(FIX) \
60 ((FIX)->fx_r_type != BFD_RELOC_386_PLT32 \
61 && (FIX)->fx_r_type != BFD_RELOC_386_GOT32 \
62 && (FIX)->fx_r_type != BFD_RELOC_386_GOTPC)
64 #define TARGET_ARCH bfd_arch_i386
68 #define TARGET_FORMAT "a.out-i386-netbsd"
71 #define TARGET_FORMAT "a.out-i386-bsd"
74 #define TARGET_FORMAT "a.out-i386-linux"
77 #define TARGET_FORMAT "a.out-mach3"
80 #define TARGET_FORMAT "a.out-i386"
85 #define TARGET_FORMAT "elf32-i386"
88 #else /* ! BFD_ASSEMBLER */
92 #define COFF_MAGIC I386MAGIC
93 #define BFD_ARCH bfd_arch_i386
94 #define COFF_FLAGS F_AR32WR
95 #define TC_COUNT_RELOC(x) ((x)->fx_addsy || (x)->fx_r_type==7)
96 #define TC_FORCE_RELOCATION(x) ((x)->fx_r_type==7)
97 #define TC_COFF_FIX2RTYPE(fixP) tc_coff_fix2rtype(fixP)
98 extern short tc_coff_fix2rtype ();
99 #define TC_COFF_SIZEMACHDEP(frag) tc_coff_sizemachdep(frag)
100 extern int tc_coff_sizemachdep
PARAMS ((fragS
*frag
));
101 #define SUB_SEGMENT_ALIGN(SEG) 2
102 #define TC_RVA_RELOC 7
103 /* Need this for PIC relocations */
104 #define NEED_FX_R_TYPE
108 /* The BSDI linker apparently rejects objects with a machine type of
110 #define AOUT_MACHTYPE 0
112 #define AOUT_MACHTYPE 100
115 #undef REVERSE_SORT_RELOCS
117 #endif /* ! BFD_ASSEMBLER */
120 #define NO_RELOC BFD_RELOC_NONE
124 #define tc_coff_symbol_emit_hook(a) ; /* not used */
128 /* Local labels starts with .L */
129 #define LOCAL_LABEL(name) (name[0] == '.' \
130 && (name[1] == 'L' || name[1] == 'X' || name[1] == '.'))
131 #define FAKE_LABEL_NAME ".L0\001"
134 #define LOCAL_LABELS_FB 1
136 #define tc_aout_pre_write_hook(x) {;} /* not used */
137 #define tc_crawl_symbol_chain(a) {;} /* not used */
138 #define tc_headers_hook(a) {;} /* not used */
140 #define MAX_OPERANDS 3 /* max operands per insn */
141 #define MAX_PREFIXES 5 /* max prefixes per opcode */
142 #define MAX_IMMEDIATE_OPERANDS 2/* max immediates per insn */
143 #define MAX_MEMORY_OPERANDS 2 /* max memory ref per insn (lcall uses 2) */
145 /* we define the syntax here (modulo base,index,scale syntax) */
146 #define REGISTER_PREFIX '%'
147 #define IMMEDIATE_PREFIX '$'
148 #define ABSOLUTE_PREFIX '*'
149 #define PREFIX_SEPERATOR '/'
151 #define TWO_BYTE_OPCODE_ESCAPE 0x0f
152 #define NOP_OPCODE (char) 0x90
154 /* register numbers */
155 #define EBP_REG_NUM 5
156 #define ESP_REG_NUM 4
158 /* modrm_byte.regmem for twobyte escape */
159 #define ESCAPE_TO_TWO_BYTE_ADDRESSING ESP_REG_NUM
160 /* index_base_byte.index for no index register addressing */
161 #define NO_INDEX_REGISTER ESP_REG_NUM
162 /* index_base_byte.base for no base register addressing */
163 #define NO_BASE_REGISTER EBP_REG_NUM
165 /* these are the att as opcode suffixes, making movl --> mov, for example */
166 #define DWORD_OPCODE_SUFFIX 'l'
167 #define WORD_OPCODE_SUFFIX 'w'
168 #define BYTE_OPCODE_SUFFIX 'b'
170 /* modrm.mode = REGMEM_FIELD_HAS_REG when a register is in there */
171 #define REGMEM_FIELD_HAS_REG 0x3/* always = 0x3 */
172 #define REGMEM_FIELD_HAS_MEM (~REGMEM_FIELD_HAS_REG)
174 #define END_OF_INSN '\0'
177 When an operand is read in it is classified by its type. This type includes
178 all the possible ways an operand can be used. Thus, '%eax' is both 'register
179 # 0' and 'The Accumulator'. In our language this is expressed by OR'ing
180 'Reg32' (any 32 bit register) and 'Acc' (the accumulator).
181 Operands are classified so that we can match given operand types with
182 the opcode table in i386-opcode.h.
186 #define Reg8 0x1 /* 8 bit reg */
187 #define Reg16 0x2 /* 16 bit reg */
188 #define Reg32 0x4 /* 32 bit reg */
189 #define Reg (Reg8|Reg16|Reg32) /* gen'l register */
190 #define WordReg (Reg16|Reg32) /* for push/pop operands */
192 #define Imm8 0x8 /* 8 bit immediate */
193 #define Imm8S 0x10 /* 8 bit immediate sign extended */
194 #define Imm16 0x20 /* 16 bit immediate */
195 #define Imm32 0x40 /* 32 bit immediate */
196 #define Imm1 0x80 /* 1 bit immediate */
197 #define ImmUnknown Imm32 /* for unknown expressions */
198 #define Imm (Imm8|Imm8S|Imm16|Imm32) /* gen'l immediate */
200 #define Disp8 0x200 /* 8 bit displacement (for jumps) */
201 #define Disp16 0x400 /* 16 bit displacement */
202 #define Disp32 0x800 /* 32 bit displacement */
203 #define Disp (Disp8|Disp16|Disp32) /* General displacement */
204 #define DispUnknown Disp32 /* for unknown size displacements */
208 #define BaseIndex 0x8000
209 #define Mem (Disp|Mem8|Mem16|Mem32|BaseIndex) /* General memory */
210 #define WordMem (Mem16|Mem32|Disp|BaseIndex)
211 #define ByteMem (Mem8|Disp|BaseIndex)
213 #define InOutPortReg 0x10000 /* register to hold in/out port addr = dx */
214 #define ShiftCount 0x20000 /* register to hold shift cound = cl */
215 #define Control 0x40000 /* Control register */
216 #define Debug 0x80000 /* Debug register */
217 #define Test 0x100000 /* Test register */
218 #define FloatReg 0x200000 /* Float register */
219 #define FloatAcc 0x400000 /* Float stack top %st(0) */
220 #define SReg2 0x800000 /* 2 bit segment register */
221 #define SReg3 0x1000000 /* 3 bit segment register */
222 #define Acc 0x2000000 /* Accumulator %al or %ax or %eax */
223 #define ImplicitRegister (InOutPortReg|ShiftCount|Acc|FloatAcc)
224 #define JumpAbsolute 0x4000000
225 #define Abs8 0x08000000
226 #define Abs16 0x10000000
227 #define Abs32 0x20000000
228 #define Abs (Abs8|Abs16|Abs32)
230 #define Byte (Reg8|Imm8|Imm8S)
231 #define Word (Reg16|Imm16)
232 #define DWord (Reg32|Imm32)
234 #define SMALLEST_DISP_TYPE(num) \
235 fits_in_signed_byte(num) ? (Disp8|Disp32|Abs8|Abs32) : (Disp32|Abs32)
239 /* instruction name sans width suffix ("mov" for movl insns) */
242 /* how many operands */
243 unsigned int operands
;
245 /* base_opcode is the fundamental opcode byte with a optional prefix(es). */
246 unsigned int base_opcode
;
248 /* extension_opcode is the 3 bit extension for group <n> insns.
249 If this template has no extension opcode (the usual case) use None */
250 unsigned char extension_opcode
;
251 #define None 0xff /* If no extension_opcode is possible. */
253 /* the bits in opcode_modifier are used to generate the final opcode from
254 the base_opcode. These bits also are used to detect alternate forms of
255 the same instruction */
256 unsigned int opcode_modifier
;
258 /* opcode_modifier bits: */
259 #define W 0x1 /* set if operands are words or dwords */
260 #define D 0x2 /* D = 0 if Reg --> Regmem; D = 1 if Regmem --> Reg */
261 /* direction flag for floating insns: MUST BE 0x400 */
265 #define ShortForm 0x10 /* register is in low 3 bits of opcode */
266 #define ShortFormW 0x20 /* ShortForm and W bit is 0x8 */
267 #define Seg2ShortForm 0x40 /* encoding of load segment reg insns */
268 #define Seg3ShortForm 0x80 /* fs/gs segment register insns. */
269 #define Jump 0x100 /* special case for jump insns. */
270 #define JumpInterSegment 0x200 /* special case for intersegment leaps/calls */
271 /* 0x400 CANNOT BE USED since it's already used by FloatD above */
272 #define DONT_USE 0x400
273 #define NoModrm 0x800
275 #define imulKludge 0x2000
276 #define JumpByte 0x4000
277 #define JumpDword 0x8000
278 #define ReverseRegRegmem 0x10000
279 #define Data16 0x20000 /* needs data prefix if in 32-bit mode */
280 #define Data32 0x40000 /* needs data prefix if in 16-bit mode */
282 /* (opcode_modifier & COMES_IN_ALL_SIZES) is true if the
283 instuction comes in byte, word, and dword sizes and is encoded into
284 machine code in the canonical way. */
285 #define COMES_IN_ALL_SIZES (W)
287 /* (opcode_modifier & COMES_IN_BOTH_DIRECTIONS) indicates that the
288 source and destination operands can be reversed by setting either
289 the D (for integer insns) or the FloatD (for floating insns) bit
291 #define COMES_IN_BOTH_DIRECTIONS (D|FloatD)
293 /* operand_types[i] describes the type of operand i. This is made
294 by OR'ing together all of the possible type masks. (e.g.
295 'operand_types[i] = Reg|Imm' specifies that operand i can be
296 either a register or an immediate operand */
297 unsigned int operand_types
[3];
302 'templates' is for grouping together 'template' structures for opcodes
303 of the same name. This is only used for storing the insns in the grand
304 ole hash table of insns.
305 The templates themselves start at START and range up to (but not including)
314 /* these are for register name --> number & type hash lookup */
318 unsigned int reg_type
;
319 unsigned int reg_num
;
327 unsigned int seg_prefix
;
332 /* these are for prefix name --> prefix code hash lookup */
336 unsigned char prefix_code
;
341 /* 386 operand encoding bytes: see 386 book for details of this. */
344 unsigned regmem
:3; /* codes register or memory operand */
345 unsigned reg
:3; /* codes register operand (or extended opcode) */
346 unsigned mode
:2; /* how to interpret regmem & reg */
351 /* 386 opcode byte to code indirect addressing. */
361 /* The name of the global offset table generated by the compiler. Allow
362 this to be overridden if need be. */
363 #ifndef GLOBAL_OFFSET_TABLE_NAME
364 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
368 void i386_validate_fix ();
369 #define TC_VALIDATE_FIX(FIXP,SEGTYPE,SKIP) i386_validate_fix(FIXP)
374 #define md_operand(x)
376 extern const struct relax_type md_relax_table
[];
377 #define TC_GENERIC_RELAX_TABLE md_relax_table
380 extern int flag_16bit_code
;
382 #define md_do_align(n, fill, len, max, around) \
383 if ((n) && !need_pass_2 \
384 && (!(fill) || ((char)*(fill) == (char)0x90 && (len) == 1)) \
385 && now_seg != data_section && now_seg != bss_section) \
388 p = frag_var (rs_align_code, 15, 1, (relax_substateT) max, \
389 (symbolS *) 0, (long) (n), (char *) 0); \
394 extern void i386_align_code
PARAMS ((fragS
*, int));
396 #define HANDLE_ALIGN(fragP) \
397 if (fragP->fr_type == rs_align_code) \
398 i386_align_code (fragP, (fragP->fr_next->fr_address \
399 - fragP->fr_address \
402 /* call md_apply_fix3 with segment instead of md_apply_fix */
403 #define MD_APPLY_FIX3
405 void i386_print_statistics
PARAMS ((FILE *));
406 #define tc_print_statistics i386_print_statistics
408 #define md_number_to_chars number_to_chars_littleendian
411 #define tc_init_after_args() sco_id ()
412 extern void sco_id
PARAMS ((void));
415 /* end of tc-i386.h */