1 /* tc-i386.c -- Assemble Intel syntax code for ix86/x86-64
3 Free Software Foundation, Inc.
5 This file is part of GAS, the GNU Assembler.
7 GAS is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
12 GAS is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
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, 51 Franklin Street - Fifth Floor, Boston, MA
24 operatorT op_modifier
; /* Operand modifier. */
25 int is_mem
; /* 1 if operand is memory reference. */
26 int is_indirect
; /* 1 if operand is indirect reference. */
27 int has_offset
; /* 1 if operand has offset. */
28 unsigned int in_offset
; /* >=1 if processing operand of offset. */
29 unsigned int in_bracket
; /* >=1 if processing operand in brackets. */
30 unsigned int in_scale
; /* >=1 if processing multipication operand
32 i386_operand_type reloc_types
; /* Value obtained from lex_got(). */
33 const reg_entry
*base
; /* Base register (if any). */
34 const reg_entry
*index
; /* Index register (if any). */
35 offsetT scale_factor
; /* Accumulated scale factor. */
40 /* offset X_add_symbol */
41 #define O_offset O_md32
42 /* offset X_add_symbol */
43 #define O_short O_md31
44 /* near ptr X_add_symbol */
45 #define O_near_ptr O_md30
46 /* far ptr X_add_symbol */
47 #define O_far_ptr O_md29
48 /* byte ptr X_add_symbol */
49 #define O_byte_ptr O_md28
50 /* word ptr X_add_symbol */
51 #define O_word_ptr O_md27
52 /* dword ptr X_add_symbol */
53 #define O_dword_ptr O_md26
54 /* qword ptr X_add_symbol */
55 #define O_qword_ptr O_md25
56 /* oword ptr X_add_symbol */
57 #define O_oword_ptr O_md24
58 /* fword ptr X_add_symbol */
59 #define O_fword_ptr O_md23
60 /* tbyte ptr X_add_symbol */
61 #define O_tbyte_ptr O_md22
62 /* xmmword ptr X_add_symbol */
63 #define O_xmmword_ptr O_md21
64 /* ymmword ptr X_add_symbol */
65 #define O_ymmword_ptr O_md20
71 unsigned int operands
;
73 const i386_operators
[] =
75 { "and", O_bit_and
, 2 },
81 { "mod", O_modulus
, 2 },
83 { "not", O_bit_not
, 1 },
84 { "offset", O_offset
, 1 },
85 { "or", O_bit_inclusive_or
, 2 },
86 { "shl", O_left_shift
, 2 },
87 { "short", O_short
, 1 },
88 { "shr", O_right_shift
, 2 },
89 { "xor", O_bit_exclusive_or
, 2 },
90 { NULL
, O_illegal
, 0 }
101 #define I386_TYPE(t, n) { #t, O_##t##_ptr, { n, n, n } }
107 I386_TYPE(tbyte
, 10),
108 I386_TYPE(oword
, 16),
109 I386_TYPE(xmmword
, 16),
110 I386_TYPE(ymmword
, 32),
112 { "near", O_near_ptr
, { 0xff04, 0xff02, 0xff08 } },
113 { "far", O_far_ptr
, { 0xff06, 0xff05, 0xff06 } },
114 { NULL
, O_illegal
, { 0, 0, 0 } }
117 operatorT
i386_operator (const char *name
, unsigned int operands
, char *pc
)
128 switch (*input_line_pointer
)
131 ++input_line_pointer
;
134 ++input_line_pointer
;
137 if (this_operand
>= 0 && i
.reloc
[this_operand
] == NO_RELOC
)
140 char *gotfree_input_line
= lex_got (&i
.reloc
[this_operand
],
142 &intel_state
.reloc_types
);
144 if (!gotfree_input_line
)
146 free (gotfree_input_line
);
147 *input_line_pointer
++ = '+';
148 memset (input_line_pointer
, '0', adjust
- 1);
149 input_line_pointer
[adjust
- 1] = ' ';
157 for (j
= 0; i386_operators
[j
].name
; ++j
)
158 if (strcasecmp (i386_operators
[j
].name
, name
) == 0)
160 if (i386_operators
[j
].operands
161 && i386_operators
[j
].operands
!= operands
)
163 return i386_operators
[j
].op
;
166 for (j
= 0; i386_types
[j
].name
; ++j
)
167 if (strcasecmp (i386_types
[j
].name
, name
) == 0)
169 if (i386_types
[j
].name
&& *pc
== ' ')
171 char *pname
= ++input_line_pointer
;
172 char c
= get_symbol_end ();
174 if (strcasecmp (pname
, "ptr") == 0)
178 if (intel_syntax
> 0 || operands
!= 1)
180 return i386_types
[j
].op
;
183 *input_line_pointer
= c
;
184 input_line_pointer
= pname
- 1;
190 static int i386_intel_parse_name (const char *name
, expressionS
*e
)
194 if (! strcmp (name
, "$"))
196 current_location (e
);
200 for (j
= 0; i386_types
[j
].name
; ++j
)
201 if (strcasecmp(i386_types
[j
].name
, name
) == 0)
203 e
->X_op
= O_constant
;
204 e
->X_add_number
= i386_types
[j
].sz
[flag_code
];
205 e
->X_add_symbol
= NULL
;
206 e
->X_op_symbol
= NULL
;
213 static INLINE
int i386_intel_check (const reg_entry
*rreg
,
214 const reg_entry
*base
,
215 const reg_entry
*iindex
)
217 if ((this_operand
>= 0
218 && rreg
!= i
.op
[this_operand
].regs
)
219 || base
!= intel_state
.base
220 || iindex
!= intel_state
.index
)
222 as_bad (_("invalid use of register"));
228 static INLINE
void i386_intel_fold (expressionS
*e
, symbolS
*sym
)
230 expressionS
*exp
= symbol_get_value_expression (sym
);
231 if (S_GET_SEGMENT (sym
) == absolute_section
)
233 offsetT val
= e
->X_add_number
;
236 e
->X_add_number
+= val
;
240 if (exp
->X_op
== O_symbol
241 && strcmp (S_GET_NAME (exp
->X_add_symbol
),
242 GLOBAL_OFFSET_TABLE_NAME
) == 0)
243 sym
= exp
->X_add_symbol
;
244 e
->X_add_symbol
= sym
;
245 e
->X_op_symbol
= NULL
;
251 i386_intel_simplify_register (expressionS
*e
)
255 if (this_operand
< 0 || intel_state
.in_offset
)
257 as_bad (_("invalid use of register"));
261 if (e
->X_op
== O_register
)
262 reg_num
= e
->X_add_number
;
264 reg_num
= e
->X_md
- 1;
266 if (!intel_state
.in_bracket
)
268 if (i
.op
[this_operand
].regs
)
270 as_bad (_("invalid use of register"));
273 if (i386_regtab
[reg_num
].reg_type
.bitfield
.sreg3
274 && i386_regtab
[reg_num
].reg_num
== RegFlat
)
276 as_bad (_("invalid use of pseudo-register"));
279 i
.op
[this_operand
].regs
= i386_regtab
+ reg_num
;
281 else if (!intel_state
.index
282 && (i386_regtab
[reg_num
].reg_type
.bitfield
.regxmm
283 || i386_regtab
[reg_num
].reg_type
.bitfield
.regymm
))
284 intel_state
.index
= i386_regtab
+ reg_num
;
285 else if (!intel_state
.base
&& !intel_state
.in_scale
)
286 intel_state
.base
= i386_regtab
+ reg_num
;
287 else if (!intel_state
.index
)
289 if (intel_state
.in_scale
290 || i386_regtab
[reg_num
].reg_type
.bitfield
.baseindex
)
291 intel_state
.index
= i386_regtab
+ reg_num
;
294 /* Convert base to index and make ESP/RSP the base. */
295 intel_state
.index
= intel_state
.base
;
296 intel_state
.base
= i386_regtab
+ reg_num
;
301 /* esp is invalid as index */
302 intel_state
.index
= i386_regtab
+ REGNAM_EAX
+ ESP_REG_NUM
;
307 static int i386_intel_simplify (expressionS
*);
309 static INLINE
int i386_intel_simplify_symbol(symbolS
*sym
)
311 int ret
= i386_intel_simplify (symbol_get_value_expression (sym
));
315 S_SET_SEGMENT(sym
, absolute_section
);
321 static int i386_intel_simplify (expressionS
*e
)
323 const reg_entry
*the_reg
= (this_operand
>= 0
324 ? i
.op
[this_operand
].regs
: NULL
);
325 const reg_entry
*base
= intel_state
.base
;
326 const reg_entry
*state_index
= intel_state
.index
;
337 if (!i386_intel_simplify_symbol (e
->X_add_symbol
)
338 || !i386_intel_check(the_reg
, intel_state
.base
,
342 if (!intel_state
.in_offset
)
343 ++intel_state
.in_bracket
;
344 ret
= i386_intel_simplify_symbol (e
->X_op_symbol
);
345 if (!intel_state
.in_offset
)
346 --intel_state
.in_bracket
;
352 i386_intel_fold (e
, e
->X_op_symbol
);
356 intel_state
.has_offset
= 1;
357 ++intel_state
.in_offset
;
358 ret
= i386_intel_simplify_symbol (e
->X_add_symbol
);
359 --intel_state
.in_offset
;
360 if (!ret
|| !i386_intel_check(the_reg
, base
, state_index
))
362 i386_intel_fold (e
, e
->X_add_symbol
);
376 if (intel_state
.op_modifier
== O_absent
)
377 intel_state
.op_modifier
= e
->X_op
;
380 if (symbol_get_value_expression (e
->X_add_symbol
)->X_op
383 as_bad (_("invalid use of register"));
386 if (!i386_intel_simplify_symbol (e
->X_add_symbol
))
388 i386_intel_fold (e
, e
->X_add_symbol
);
392 if (symbol_get_value_expression (e
->X_op_symbol
)->X_op
395 as_bad (_("invalid use of register"));
398 if (!i386_intel_simplify_symbol (e
->X_op_symbol
)
399 || !i386_intel_check(the_reg
, intel_state
.base
,
402 if (!intel_state
.in_offset
)
403 intel_state
.seg
= e
->X_add_symbol
;
404 i386_intel_fold (e
, e
->X_op_symbol
);
408 if (this_operand
>= 0 && intel_state
.in_bracket
)
410 expressionS
*scale
= NULL
;
412 if (intel_state
.index
)
415 if (!intel_state
.in_scale
++)
416 intel_state
.scale_factor
= 1;
418 ret
= i386_intel_simplify_symbol (e
->X_add_symbol
);
419 if (ret
&& !scale
&& intel_state
.index
)
420 scale
= symbol_get_value_expression (e
->X_op_symbol
);
423 ret
= i386_intel_simplify_symbol (e
->X_op_symbol
);
424 if (ret
&& !scale
&& intel_state
.index
)
425 scale
= symbol_get_value_expression (e
->X_add_symbol
);
427 if (ret
&& scale
&& (scale
+ 1))
429 resolve_expression (scale
);
430 if (scale
->X_op
!= O_constant
431 || intel_state
.index
->reg_type
.bitfield
.reg16
)
432 scale
->X_add_number
= 0;
433 intel_state
.scale_factor
*= scale
->X_add_number
;
436 --intel_state
.in_scale
;
440 if (!intel_state
.in_scale
)
441 switch (intel_state
.scale_factor
)
444 i
.log2_scale_factor
= 0;
447 i
.log2_scale_factor
= 1;
450 i
.log2_scale_factor
= 2;
453 i
.log2_scale_factor
= 3;
456 /* esp is invalid as index */
457 intel_state
.index
= i386_regtab
+ REGNAM_EAX
+ ESP_REG_NUM
;
466 ret
= i386_intel_simplify_register (e
);
469 gas_assert (e
->X_add_number
< (unsigned short) -1);
470 e
->X_md
= (unsigned short) e
->X_add_number
+ 1;
471 e
->X_op
= O_constant
;
478 return i386_intel_simplify_register (e
);
484 && !i386_intel_simplify_symbol (e
->X_add_symbol
))
486 if (e
->X_op
== O_add
|| e
->X_op
== O_subtract
)
488 base
= intel_state
.base
;
489 state_index
= intel_state
.index
;
491 if (!i386_intel_check (the_reg
, base
, state_index
)
493 && !i386_intel_simplify_symbol (e
->X_op_symbol
))
494 || !i386_intel_check (the_reg
,
496 ? base
: intel_state
.base
),
498 ? state_index
: intel_state
.index
)))
503 if (this_operand
>= 0
504 && e
->X_op
== O_symbol
505 && !intel_state
.in_offset
)
507 segT seg
= S_GET_SEGMENT (e
->X_add_symbol
);
509 if (seg
!= absolute_section
510 && seg
!= reg_section
511 && seg
!= expr_section
)
512 intel_state
.is_mem
|= 2 - !intel_state
.in_bracket
;
518 int i386_need_index_operator (void)
520 return intel_syntax
< 0;
524 i386_intel_operand (char *operand_string
, int got_a_float
)
526 char *saved_input_line_pointer
, *buf
;
528 expressionS exp
, *expP
;
532 /* Initialize state structure. */
533 intel_state
.op_modifier
= O_absent
;
534 intel_state
.is_mem
= 0;
535 intel_state
.is_indirect
= 0;
536 intel_state
.has_offset
= 0;
537 intel_state
.base
= NULL
;
538 intel_state
.index
= NULL
;
539 intel_state
.seg
= NULL
;
540 operand_type_set (&intel_state
.reloc_types
, ~0);
541 gas_assert (!intel_state
.in_offset
);
542 gas_assert (!intel_state
.in_bracket
);
543 gas_assert (!intel_state
.in_scale
);
545 saved_input_line_pointer
= input_line_pointer
;
546 input_line_pointer
= buf
= xstrdup (operand_string
);
549 memset (&exp
, 0, sizeof(exp
));
550 exp_seg
= expression (&exp
);
551 ret
= i386_intel_simplify (&exp
);
555 if (!is_end_of_line
[(unsigned char) *input_line_pointer
])
557 as_bad (_("junk `%s' after expression"), input_line_pointer
);
560 else if (exp
.X_op
== O_illegal
|| exp
.X_op
== O_absent
)
562 as_bad (_("invalid expression"));
565 else if (!intel_state
.has_offset
566 && input_line_pointer
> buf
567 && *(input_line_pointer
- 1) == ']')
569 intel_state
.is_mem
|= 1;
570 intel_state
.is_indirect
= 1;
573 input_line_pointer
= saved_input_line_pointer
;
576 gas_assert (!intel_state
.in_offset
);
577 gas_assert (!intel_state
.in_bracket
);
578 gas_assert (!intel_state
.in_scale
);
583 if (intel_state
.op_modifier
!= O_absent
584 && current_templates
->start
->base_opcode
!= 0x8d /* lea */)
586 i
.types
[this_operand
].bitfield
.unspecified
= 0;
588 switch (intel_state
.op_modifier
)
591 i
.types
[this_operand
].bitfield
.byte
= 1;
592 suffix
= BYTE_MNEM_SUFFIX
;
596 i
.types
[this_operand
].bitfield
.word
= 1;
597 if ((current_templates
->start
->name
[0] == 'l'
598 && current_templates
->start
->name
[2] == 's'
599 && current_templates
->start
->name
[3] == 0)
600 || current_templates
->start
->base_opcode
== 0x62 /* bound */)
601 suffix
= BYTE_MNEM_SUFFIX
; /* so it will cause an error */
602 else if (got_a_float
== 2) /* "fi..." */
603 suffix
= SHORT_MNEM_SUFFIX
;
605 suffix
= WORD_MNEM_SUFFIX
;
609 i
.types
[this_operand
].bitfield
.dword
= 1;
610 if ((current_templates
->start
->name
[0] == 'l'
611 && current_templates
->start
->name
[2] == 's'
612 && current_templates
->start
->name
[3] == 0)
613 || current_templates
->start
->base_opcode
== 0x62 /* bound */)
614 suffix
= WORD_MNEM_SUFFIX
;
615 else if (flag_code
== CODE_16BIT
616 && (current_templates
->start
->opcode_modifier
.jump
617 || current_templates
->start
->opcode_modifier
.jumpdword
))
618 suffix
= LONG_DOUBLE_MNEM_SUFFIX
;
619 else if (got_a_float
== 1) /* "f..." */
620 suffix
= SHORT_MNEM_SUFFIX
;
622 suffix
= LONG_MNEM_SUFFIX
;
626 i
.types
[this_operand
].bitfield
.fword
= 1;
627 if (current_templates
->start
->name
[0] == 'l'
628 && current_templates
->start
->name
[2] == 's'
629 && current_templates
->start
->name
[3] == 0)
630 suffix
= LONG_MNEM_SUFFIX
;
631 else if (!got_a_float
)
633 if (flag_code
== CODE_16BIT
)
634 add_prefix (DATA_PREFIX_OPCODE
);
635 suffix
= LONG_DOUBLE_MNEM_SUFFIX
;
638 suffix
= BYTE_MNEM_SUFFIX
; /* so it will cause an error */
642 i
.types
[this_operand
].bitfield
.qword
= 1;
643 if (current_templates
->start
->base_opcode
== 0x62 /* bound */
644 || got_a_float
== 1) /* "f..." */
645 suffix
= LONG_MNEM_SUFFIX
;
647 suffix
= QWORD_MNEM_SUFFIX
;
651 i
.types
[this_operand
].bitfield
.tbyte
= 1;
652 if (got_a_float
== 1)
653 suffix
= LONG_DOUBLE_MNEM_SUFFIX
;
655 suffix
= BYTE_MNEM_SUFFIX
; /* so it will cause an error */
660 i
.types
[this_operand
].bitfield
.xmmword
= 1;
661 suffix
= XMMWORD_MNEM_SUFFIX
;
665 i
.types
[this_operand
].bitfield
.ymmword
= 1;
666 suffix
= YMMWORD_MNEM_SUFFIX
;
670 suffix
= LONG_DOUBLE_MNEM_SUFFIX
;
673 if (!current_templates
->start
->opcode_modifier
.jump
674 && !current_templates
->start
->opcode_modifier
.jumpdword
)
675 suffix
= got_a_float
/* so it will cause an error */
677 : LONG_DOUBLE_MNEM_SUFFIX
;
681 BAD_CASE (intel_state
.op_modifier
);
687 else if (i
.suffix
!= suffix
)
689 as_bad (_("conflicting operand size modifiers"));
694 /* Operands for jump/call need special consideration. */
695 if (current_templates
->start
->opcode_modifier
.jump
696 || current_templates
->start
->opcode_modifier
.jumpdword
697 || current_templates
->start
->opcode_modifier
.jumpintersegment
)
699 if (i
.op
[this_operand
].regs
702 || intel_state
.is_mem
> 1)
703 i
.types
[this_operand
].bitfield
.jumpabsolute
= 1;
705 switch (intel_state
.op_modifier
)
709 i
.types
[this_operand
].bitfield
.jumpabsolute
= 1;
711 intel_state
.is_mem
= 1;
715 if (!intel_state
.seg
)
717 intel_state
.is_mem
= 1;
718 if (intel_state
.op_modifier
== O_absent
)
720 if (intel_state
.is_indirect
== 1)
721 i
.types
[this_operand
].bitfield
.jumpabsolute
= 1;
724 as_bad (_("cannot infer the segment part of the operand"));
727 else if (S_GET_SEGMENT (intel_state
.seg
) == reg_section
)
728 i
.types
[this_operand
].bitfield
.jumpabsolute
= 1;
731 i386_operand_type types
;
733 if (i
.imm_operands
>= MAX_IMMEDIATE_OPERANDS
)
735 as_bad (_("at most %d immediate operands are allowed"),
736 MAX_IMMEDIATE_OPERANDS
);
739 expP
= &im_expressions
[i
.imm_operands
++];
740 memset (expP
, 0, sizeof(*expP
));
741 expP
->X_op
= O_symbol
;
742 expP
->X_add_symbol
= intel_state
.seg
;
743 i
.op
[this_operand
].imms
= expP
;
745 resolve_expression (expP
);
746 operand_type_set (&types
, ~0);
747 if (!i386_finalize_immediate (S_GET_SEGMENT (intel_state
.seg
),
748 expP
, types
, operand_string
))
750 if (i
.operands
< MAX_OPERANDS
)
752 this_operand
= i
.operands
++;
753 i
.types
[this_operand
].bitfield
.unspecified
= 1;
755 if (suffix
== LONG_DOUBLE_MNEM_SUFFIX
)
757 intel_state
.seg
= NULL
;
758 intel_state
.is_mem
= 0;
762 i
.types
[this_operand
].bitfield
.jumpabsolute
= 1;
765 if (i
.types
[this_operand
].bitfield
.jumpabsolute
)
766 intel_state
.is_mem
|= 1;
768 else if (intel_state
.seg
)
769 intel_state
.is_mem
|= 1;
771 if (i
.op
[this_operand
].regs
)
773 i386_operand_type temp
;
775 /* Register operand. */
776 if (intel_state
.base
|| intel_state
.index
|| intel_state
.seg
)
778 as_bad (_("invalid operand"));
782 temp
= i
.op
[this_operand
].regs
->reg_type
;
783 temp
.bitfield
.baseindex
= 0;
784 i
.types
[this_operand
] = operand_type_or (i
.types
[this_operand
],
786 i
.types
[this_operand
].bitfield
.unspecified
= 0;
789 else if (intel_state
.base
792 || intel_state
.is_mem
)
794 /* Memory operand. */
796 >= 2 - !current_templates
->start
->opcode_modifier
.isstring
)
800 call 0x9090,0x90909090
801 lcall 0x9090,0x90909090
802 jmp 0x9090,0x90909090
803 ljmp 0x9090,0x90909090
806 if ((current_templates
->start
->opcode_modifier
.jumpintersegment
807 || current_templates
->start
->opcode_modifier
.jumpdword
808 || current_templates
->start
->opcode_modifier
.jump
)
810 && intel_state
.seg
== NULL
811 && i
.mem_operands
== 1
812 && i
.disp_operands
== 1
813 && intel_state
.op_modifier
== O_absent
)
815 /* Try to process the first operand as immediate, */
817 if (i386_finalize_immediate (exp_seg
, i
.op
[0].imms
,
818 intel_state
.reloc_types
,
822 expP
= &im_expressions
[0];
823 i
.op
[this_operand
].imms
= expP
;
826 /* Try to process the second operand as immediate, */
827 if (i386_finalize_immediate (exp_seg
, expP
,
828 intel_state
.reloc_types
,
834 i
.types
[0].bitfield
.mem
= 0;
835 i
.types
[0].bitfield
.disp16
= 0;
836 i
.types
[0].bitfield
.disp32
= 0;
837 i
.types
[0].bitfield
.disp32s
= 0;
843 as_bad (_("too many memory references for `%s'"),
844 current_templates
->start
->name
);
848 expP
= &disp_expressions
[i
.disp_operands
];
849 memcpy (expP
, &exp
, sizeof(exp
));
850 resolve_expression (expP
);
852 if (expP
->X_op
!= O_constant
853 || expP
->X_add_number
854 || (!intel_state
.base
855 && !intel_state
.index
))
857 i
.op
[this_operand
].disps
= expP
;
860 if (flag_code
== CODE_64BIT
)
862 i
.types
[this_operand
].bitfield
.disp32
= 1;
863 if (!i
.prefix
[ADDR_PREFIX
])
865 i
.types
[this_operand
].bitfield
.disp64
= 1;
866 i
.types
[this_operand
].bitfield
.disp32s
= 1;
869 else if (!i
.prefix
[ADDR_PREFIX
] ^ (flag_code
== CODE_16BIT
))
870 i
.types
[this_operand
].bitfield
.disp32
= 1;
872 i
.types
[this_operand
].bitfield
.disp16
= 1;
874 #if defined (OBJ_AOUT) || defined (OBJ_MAYBE_AOUT)
876 * exp_seg is used only for verification in
877 * i386_finalize_displacement, and we can end up seeing reg_section
878 * here - but we know we removed all registers from the expression
879 * (or error-ed on any remaining ones) in i386_intel_simplify. I
880 * consider the check in i386_finalize_displacement bogus anyway, in
881 * particular because it doesn't allow for expr_section, so I'd
882 * rather see that check (and the similar one in
883 * i386_finalize_immediate) use SEG_NORMAL(), but not being an a.out
884 * expert I can't really say whether that would have other bad side
887 if (OUTPUT_FLAVOR
== bfd_target_aout_flavour
888 && exp_seg
== reg_section
)
889 exp_seg
= expP
->X_op
!= O_constant
? undefined_section
893 if (!i386_finalize_displacement (exp_seg
, expP
,
894 intel_state
.reloc_types
,
899 if (intel_state
.base
|| intel_state
.index
)
900 i
.types
[this_operand
].bitfield
.baseindex
= 1;
906 expP
= symbol_get_value_expression (intel_state
.seg
);
907 if (expP
->X_op
!= O_full_ptr
)
909 intel_state
.seg
= expP
->X_add_symbol
;
911 if (expP
->X_op
!= O_register
)
913 as_bad (_("segment register name expected"));
916 if (!i386_regtab
[expP
->X_add_number
].reg_type
.bitfield
.sreg2
917 && !i386_regtab
[expP
->X_add_number
].reg_type
.bitfield
.sreg3
)
919 as_bad (_("invalid use of register"));
922 switch (i386_regtab
[expP
->X_add_number
].reg_num
)
924 case 0: i
.seg
[i
.mem_operands
] = &es
; break;
925 case 1: i
.seg
[i
.mem_operands
] = &cs
; break;
926 case 2: i
.seg
[i
.mem_operands
] = &ss
; break;
927 case 3: i
.seg
[i
.mem_operands
] = &ds
; break;
928 case 4: i
.seg
[i
.mem_operands
] = &fs
; break;
929 case 5: i
.seg
[i
.mem_operands
] = &gs
; break;
930 case RegFlat
: i
.seg
[i
.mem_operands
] = NULL
; break;
934 /* Swap base and index in 16-bit memory operands like
935 [si+bx]. Since i386_index_check is also used in AT&T
936 mode we have to do that here. */
939 && intel_state
.base
->reg_type
.bitfield
.reg16
940 && intel_state
.index
->reg_type
.bitfield
.reg16
941 && intel_state
.base
->reg_num
>= 6
942 && intel_state
.index
->reg_num
< 6)
944 i
.base_reg
= intel_state
.index
;
945 i
.index_reg
= intel_state
.base
;
949 i
.base_reg
= intel_state
.base
;
950 i
.index_reg
= intel_state
.index
;
953 if (!i386_index_check (operand_string
))
956 i
.types
[this_operand
].bitfield
.mem
= 1;
962 if (i
.imm_operands
>= MAX_IMMEDIATE_OPERANDS
)
964 as_bad (_("at most %d immediate operands are allowed"),
965 MAX_IMMEDIATE_OPERANDS
);
969 expP
= &im_expressions
[i
.imm_operands
++];
970 i
.op
[this_operand
].imms
= expP
;
973 return i386_finalize_immediate (exp_seg
, expP
, intel_state
.reloc_types
,