1 /* tc-avr.c -- Assembler code for the ATMEL AVR
3 Copyright 1999, 2000, 2001, 2002, 2004, 2005, 2006
4 Free Software Foundation, Inc.
5 Contributed by Denis Chertykov <denisc@overta.ru>
7 This file is part of GAS, the GNU Assembler.
9 GAS is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
14 GAS is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GAS; see the file COPYING. If not, write to
21 the Free Software Foundation, 51 Franklin Street - Fifth Floor,
22 Boston, MA 02110-1301, USA. */
26 #include "safe-ctype.h"
28 #include "libiberty.h"
34 int insn_size
; /* In words. */
36 unsigned int bin_opcode
;
39 #define AVR_INSN(NAME, CONSTR, OPCODE, SIZE, ISA, BIN) \
40 {#NAME, CONSTR, SIZE, ISA, BIN},
42 struct avr_opcodes_s avr_opcodes
[] =
44 #include "opcode/avr.h"
48 const char comment_chars
[] = ";";
49 const char line_comment_chars
[] = "#";
50 const char line_separator_chars
[] = "$";
52 const char *md_shortopts
= "m:";
60 /* XXX - devices that don't seem to exist (renamed, replaced with larger
61 ones, or planned but never produced), left here for compatibility.
62 TODO: hide them in show_mcu_list output? */
64 static struct mcu_type_s mcu_types
[] =
66 {"avr1", AVR_ISA_TINY1
, bfd_mach_avr1
},
67 {"avr2", AVR_ISA_TINY2
, bfd_mach_avr2
},
68 {"avr3", AVR_ISA_M103
, bfd_mach_avr3
},
69 {"avr4", AVR_ISA_M8
, bfd_mach_avr4
},
70 {"avr5", AVR_ISA_ALL
, bfd_mach_avr5
},
71 {"avr6", AVR_ISA_ALL
, bfd_mach_avr6
},
72 {"at90s1200", AVR_ISA_1200
, bfd_mach_avr1
},
73 {"attiny10", AVR_ISA_TINY1
, bfd_mach_avr1
}, /* XXX -> tn11 */
74 {"attiny11", AVR_ISA_TINY1
, bfd_mach_avr1
},
75 {"attiny12", AVR_ISA_TINY1
, bfd_mach_avr1
},
76 {"attiny15", AVR_ISA_TINY1
, bfd_mach_avr1
},
77 {"attiny28", AVR_ISA_TINY1
, bfd_mach_avr1
},
78 {"at90s2313", AVR_ISA_2xxx
, bfd_mach_avr2
},
79 {"at90s2323", AVR_ISA_2xxx
, bfd_mach_avr2
},
80 {"at90s2333", AVR_ISA_2xxx
, bfd_mach_avr2
}, /* XXX -> 4433 */
81 {"at90s2343", AVR_ISA_2xxx
, bfd_mach_avr2
},
82 {"attiny22", AVR_ISA_2xxx
, bfd_mach_avr2
}, /* XXX -> 2343 */
83 {"attiny26", AVR_ISA_2xxx
, bfd_mach_avr2
},
84 {"at90s4433", AVR_ISA_2xxx
, bfd_mach_avr2
},
85 {"at90s4414", AVR_ISA_2xxx
, bfd_mach_avr2
}, /* XXX -> 8515 */
86 {"at90s4434", AVR_ISA_2xxx
, bfd_mach_avr2
}, /* XXX -> 8535 */
87 {"at90s8515", AVR_ISA_2xxx
, bfd_mach_avr2
},
88 {"at90s8535", AVR_ISA_2xxx
, bfd_mach_avr2
},
89 {"at90c8534", AVR_ISA_2xxx
, bfd_mach_avr2
},
90 {"at86rf401", AVR_ISA_2xxx
, bfd_mach_avr2
},
91 {"attiny13", AVR_ISA_TINY2
, bfd_mach_avr2
},
92 {"attiny2313", AVR_ISA_TINY2
, bfd_mach_avr2
},
93 {"attiny261", AVR_ISA_TINY2
, bfd_mach_avr2
},
94 {"attiny461", AVR_ISA_TINY2
, bfd_mach_avr2
},
95 {"attiny861", AVR_ISA_TINY2
, bfd_mach_avr2
},
96 {"attiny24", AVR_ISA_TINY2
, bfd_mach_avr2
},
97 {"attiny44", AVR_ISA_TINY2
, bfd_mach_avr2
},
98 {"attiny84", AVR_ISA_TINY2
, bfd_mach_avr2
},
99 {"attiny25", AVR_ISA_TINY2
, bfd_mach_avr2
},
100 {"attiny45", AVR_ISA_TINY2
, bfd_mach_avr2
},
101 {"attiny85", AVR_ISA_TINY2
, bfd_mach_avr2
},
102 {"atmega603", AVR_ISA_M603
, bfd_mach_avr3
}, /* XXX -> m103 */
103 {"atmega103", AVR_ISA_M103
, bfd_mach_avr3
},
104 {"at43usb320", AVR_ISA_M103
, bfd_mach_avr3
},
105 {"at43usb355", AVR_ISA_M603
, bfd_mach_avr3
},
106 {"at76c711", AVR_ISA_M603
, bfd_mach_avr3
},
107 {"atmega48", AVR_ISA_PWMx
, bfd_mach_avr4
},
108 {"atmega8", AVR_ISA_M8
, bfd_mach_avr4
},
109 {"atmega83", AVR_ISA_M8
, bfd_mach_avr4
}, /* XXX -> m8535 */
110 {"atmega85", AVR_ISA_M8
, bfd_mach_avr4
}, /* XXX -> m8 */
111 {"atmega88", AVR_ISA_PWMx
, bfd_mach_avr4
},
112 {"atmega8515", AVR_ISA_M8
, bfd_mach_avr4
},
113 {"atmega8535", AVR_ISA_M8
, bfd_mach_avr4
},
114 {"at90pwm2", AVR_ISA_PWMx
, bfd_mach_avr4
},
115 {"at90pwm3", AVR_ISA_PWMx
, bfd_mach_avr4
},
116 {"atmega16", AVR_ISA_M323
, bfd_mach_avr5
},
117 {"atmega161", AVR_ISA_M161
, bfd_mach_avr5
},
118 {"atmega162", AVR_ISA_M323
, bfd_mach_avr5
},
119 {"atmega163", AVR_ISA_M161
, bfd_mach_avr5
},
120 {"atmega164", AVR_ISA_M323
, bfd_mach_avr5
},
121 {"atmega165", AVR_ISA_M323
, bfd_mach_avr5
},
122 {"atmega168", AVR_ISA_M323
, bfd_mach_avr5
},
123 {"atmega169", AVR_ISA_M323
, bfd_mach_avr5
},
124 {"atmega32", AVR_ISA_M323
, bfd_mach_avr5
},
125 {"atmega323", AVR_ISA_M323
, bfd_mach_avr5
},
126 {"atmega324", AVR_ISA_M323
, bfd_mach_avr5
},
127 {"atmega325", AVR_ISA_M323
, bfd_mach_avr5
},
128 {"atmega329", AVR_ISA_M323
, bfd_mach_avr5
},
129 {"atmega3250", AVR_ISA_M323
, bfd_mach_avr5
},
130 {"atmega3290", AVR_ISA_M323
, bfd_mach_avr5
},
131 {"atmega406", AVR_ISA_M323
, bfd_mach_avr5
},
132 {"atmega64", AVR_ISA_M323
, bfd_mach_avr5
},
133 {"atmega640", AVR_ISA_M323
, bfd_mach_avr5
},
134 {"atmega644", AVR_ISA_M323
, bfd_mach_avr5
},
135 {"atmega128", AVR_ISA_M128
, bfd_mach_avr5
},
136 {"atmega1280", AVR_ISA_M128
, bfd_mach_avr5
},
137 {"atmega1281", AVR_ISA_M128
, bfd_mach_avr5
},
138 {"atmega645", AVR_ISA_M323
, bfd_mach_avr5
},
139 {"atmega649", AVR_ISA_M323
, bfd_mach_avr5
},
140 {"atmega6450", AVR_ISA_M323
, bfd_mach_avr5
},
141 {"atmega6490", AVR_ISA_M323
, bfd_mach_avr5
},
142 {"at90can32" , AVR_ISA_M323
, bfd_mach_avr5
},
143 {"at90can64" , AVR_ISA_M323
, bfd_mach_avr5
},
144 {"at90can128", AVR_ISA_M128
, bfd_mach_avr5
},
145 {"at90usb646", AVR_ISA_M323
, bfd_mach_avr5
},
146 {"at90usb647", AVR_ISA_M323
, bfd_mach_avr5
},
147 {"at90usb1286",AVR_ISA_M128
, bfd_mach_avr5
},
148 {"at90usb1287",AVR_ISA_M128
, bfd_mach_avr5
},
149 {"at94k", AVR_ISA_94K
, bfd_mach_avr5
},
150 {"atmega2560", AVR_ISA_ALL
, bfd_mach_avr6
},
151 {"atmega2561", AVR_ISA_ALL
, bfd_mach_avr6
},
155 /* Current MCU type. */
156 static struct mcu_type_s default_mcu
= {"avr2", AVR_ISA_2xxx
,bfd_mach_avr2
};
157 static struct mcu_type_s
* avr_mcu
= & default_mcu
;
159 /* AVR target-specific switches. */
162 int all_opcodes
; /* -mall-opcodes: accept all known AVR opcodes. */
163 int no_skip_bug
; /* -mno-skip-bug: no warnings for skipping 2-word insns. */
164 int no_wrap
; /* -mno-wrap: reject rjmp/rcall with 8K wrap-around. */
167 static struct avr_opt_s avr_opt
= { 0, 0, 0 };
169 const char EXP_CHARS
[] = "eE";
170 const char FLT_CHARS
[] = "dD";
172 static void avr_set_arch (int);
174 /* The target specific pseudo-ops which we support. */
175 const pseudo_typeS md_pseudo_table
[] =
177 {"arch", avr_set_arch
, 0},
181 #define LDI_IMMEDIATE(x) (((x) & 0xf) | (((x) << 4) & 0xf00))
183 #define EXP_MOD_NAME(i) exp_mod[i].name
184 #define EXP_MOD_RELOC(i) exp_mod[i].reloc
185 #define EXP_MOD_NEG_RELOC(i) exp_mod[i].neg_reloc
186 #define HAVE_PM_P(i) exp_mod[i].have_pm
191 bfd_reloc_code_real_type reloc
;
192 bfd_reloc_code_real_type neg_reloc
;
196 static struct exp_mod_s exp_mod
[] =
198 {"hh8", BFD_RELOC_AVR_HH8_LDI
, BFD_RELOC_AVR_HH8_LDI_NEG
, 1},
199 {"pm_hh8", BFD_RELOC_AVR_HH8_LDI_PM
, BFD_RELOC_AVR_HH8_LDI_PM_NEG
, 0},
200 {"hi8", BFD_RELOC_AVR_HI8_LDI
, BFD_RELOC_AVR_HI8_LDI_NEG
, 1},
201 {"pm_hi8", BFD_RELOC_AVR_HI8_LDI_PM
, BFD_RELOC_AVR_HI8_LDI_PM_NEG
, 0},
202 {"lo8", BFD_RELOC_AVR_LO8_LDI
, BFD_RELOC_AVR_LO8_LDI_NEG
, 1},
203 {"pm_lo8", BFD_RELOC_AVR_LO8_LDI_PM
, BFD_RELOC_AVR_LO8_LDI_PM_NEG
, 0},
204 {"hlo8", BFD_RELOC_AVR_HH8_LDI
, BFD_RELOC_AVR_HH8_LDI_NEG
, 0},
205 {"hhi8", BFD_RELOC_AVR_MS8_LDI
, BFD_RELOC_AVR_MS8_LDI_NEG
, 0},
208 /* A union used to store indicies into the exp_mod[] array
209 in a hash table which expects void * data types. */
216 /* Opcode hash table. */
217 static struct hash_control
*avr_hash
;
219 /* Reloc modifiers hash control (hh8,hi8,lo8,pm_xx). */
220 static struct hash_control
*avr_mod_hash
;
222 #define OPTION_MMCU 'm'
225 OPTION_ALL_OPCODES
= OPTION_MD_BASE
+ 1,
230 struct option md_longopts
[] =
232 { "mmcu", required_argument
, NULL
, OPTION_MMCU
},
233 { "mall-opcodes", no_argument
, NULL
, OPTION_ALL_OPCODES
},
234 { "mno-skip-bug", no_argument
, NULL
, OPTION_NO_SKIP_BUG
},
235 { "mno-wrap", no_argument
, NULL
, OPTION_NO_WRAP
},
236 { NULL
, no_argument
, NULL
, 0 }
239 size_t md_longopts_size
= sizeof (md_longopts
);
241 /* Display nicely formatted list of known MCU names. */
244 show_mcu_list (FILE *stream
)
248 fprintf (stream
, _("Known MCU names:"));
251 for (i
= 0; mcu_types
[i
].name
; i
++)
253 int len
= strlen (mcu_types
[i
].name
);
258 fprintf (stream
, " %s", mcu_types
[i
].name
);
261 fprintf (stream
, "\n %s", mcu_types
[i
].name
);
266 fprintf (stream
, "\n");
272 while (*s
== ' ' || *s
== '\t')
277 /* Extract one word from FROM and copy it to TO. */
280 extract_word (char *from
, char *to
, int limit
)
286 /* Drop leading whitespace. */
287 from
= skip_space (from
);
290 /* Find the op code end. */
291 for (op_start
= op_end
= from
; *op_end
!= 0 && is_part_of_name (*op_end
);)
293 to
[size
++] = *op_end
++;
294 if (size
+ 1 >= limit
)
303 md_estimate_size_before_relax (fragS
*fragp ATTRIBUTE_UNUSED
,
304 asection
*seg ATTRIBUTE_UNUSED
)
311 md_show_usage (FILE *stream
)
315 " -mmcu=[avr-name] select microcontroller variant\n"
316 " [avr-name] can be:\n"
317 " avr1 - AT90S1200, ATtiny1x, ATtiny28\n"
318 " avr2 - AT90S2xxx, AT90S4xxx, AT90S8xxx, ATtiny22\n"
319 " avr3 - ATmega103, ATmega603\n"
320 " avr4 - ATmega83, ATmega85\n"
321 " avr5 - ATmega161, ATmega163, ATmega32, AT94K\n"
322 " or immediate microcontroller name.\n"));
324 _(" -mall-opcodes accept all AVR opcodes, even if not supported by MCU\n"
325 " -mno-skip-bug disable warnings for skipping two-word instructions\n"
326 " (default for avr4, avr5)\n"
327 " -mno-wrap reject rjmp/rcall instructions with 8K wrap-around\n"
328 " (default for avr3, avr5)\n"));
329 show_mcu_list (stream
);
333 avr_set_arch (int dummy ATTRIBUTE_UNUSED
)
337 input_line_pointer
= extract_word (input_line_pointer
, str
, 20);
338 md_parse_option (OPTION_MMCU
, str
);
339 bfd_set_arch_mach (stdoutput
, TARGET_ARCH
, avr_mcu
->mach
);
343 md_parse_option (int c
, char *arg
)
350 char *s
= alloca (strlen (arg
) + 1);
357 *t
= TOLOWER (*arg1
++);
361 for (i
= 0; mcu_types
[i
].name
; ++i
)
362 if (strcmp (mcu_types
[i
].name
, s
) == 0)
365 if (!mcu_types
[i
].name
)
367 show_mcu_list (stderr
);
368 as_fatal (_("unknown MCU: %s\n"), arg
);
371 /* It is OK to redefine mcu type within the same avr[1-5] bfd machine
372 type - this for allows passing -mmcu=... via gcc ASM_SPEC as well
373 as .arch ... in the asm output at the same time. */
374 if (avr_mcu
== &default_mcu
|| avr_mcu
->mach
== mcu_types
[i
].mach
)
375 avr_mcu
= &mcu_types
[i
];
377 as_fatal (_("redefinition of mcu type `%s' to `%s'"),
378 avr_mcu
->name
, mcu_types
[i
].name
);
381 case OPTION_ALL_OPCODES
:
382 avr_opt
.all_opcodes
= 1;
384 case OPTION_NO_SKIP_BUG
:
385 avr_opt
.no_skip_bug
= 1;
396 md_undefined_symbol (char *name ATTRIBUTE_UNUSED
)
401 /* Turn a string in input_line_pointer into a floating point constant
402 of type TYPE, and store the appropriate bytes in *LITP. The number
403 of LITTLENUMS emitted is stored in *SIZEP. An error message is
404 returned, or NULL on OK. */
407 md_atof (int type
, char *litP
, int *sizeP
)
410 LITTLENUM_TYPE words
[4];
411 LITTLENUM_TYPE
*wordP
;
424 return _("bad call to md_atof");
427 t
= atof_ieee (input_line_pointer
, type
, words
);
429 input_line_pointer
= t
;
431 *sizeP
= prec
* sizeof (LITTLENUM_TYPE
);
433 /* This loop outputs the LITTLENUMs in REVERSE order. */
434 for (wordP
= words
+ prec
- 1; prec
--;)
436 md_number_to_chars (litP
, (valueT
) (*wordP
--), sizeof (LITTLENUM_TYPE
));
437 litP
+= sizeof (LITTLENUM_TYPE
);
444 md_convert_frag (bfd
*abfd ATTRIBUTE_UNUSED
,
445 asection
*sec ATTRIBUTE_UNUSED
,
446 fragS
*fragP ATTRIBUTE_UNUSED
)
455 struct avr_opcodes_s
*opcode
;
457 avr_hash
= hash_new ();
459 /* Insert unique names into hash table. This hash table then provides a
460 quick index to the first opcode with a particular name in the opcode
462 for (opcode
= avr_opcodes
; opcode
->name
; opcode
++)
463 hash_insert (avr_hash
, opcode
->name
, (char *) opcode
);
465 avr_mod_hash
= hash_new ();
467 for (i
= 0; i
< ARRAY_SIZE (exp_mod
); ++i
)
472 hash_insert (avr_mod_hash
, EXP_MOD_NAME (i
), m
.ptr
);
475 bfd_set_arch_mach (stdoutput
, TARGET_ARCH
, avr_mcu
->mach
);
478 /* Resolve STR as a constant expression and return the result.
479 If result greater than MAX then error. */
482 avr_get_constant (char *str
, int max
)
486 str
= skip_space (str
);
487 input_line_pointer
= str
;
490 if (ex
.X_op
!= O_constant
)
491 as_bad (_("constant value required"));
493 if (ex
.X_add_number
> max
|| ex
.X_add_number
< 0)
494 as_bad (_("number must be less than %d"), max
+ 1);
496 return ex
.X_add_number
;
499 /* Parse for ldd/std offset. */
502 avr_offset_expression (expressionS
*exp
)
504 char *str
= input_line_pointer
;
509 str
= extract_word (str
, op
, sizeof (op
));
511 input_line_pointer
= tmp
;
514 /* Warn about expressions that fail to use lo8 (). */
515 if (exp
->X_op
== O_constant
)
517 int x
= exp
->X_add_number
;
519 if (x
< -255 || x
> 255)
520 as_warn (_("constant out of 8-bit range: %d"), x
);
524 /* Parse ordinary expression. */
527 parse_exp (char *s
, expressionS
*op
)
529 input_line_pointer
= s
;
531 if (op
->X_op
== O_absent
)
532 as_bad (_("missing operand"));
533 return input_line_pointer
;
536 /* Parse special expressions (needed for LDI command):
541 where xx is: hh, hi, lo. */
543 static bfd_reloc_code_real_type
544 avr_ldi_expression (expressionS
*exp
)
546 char *str
= input_line_pointer
;
550 int linker_stubs_should_be_generated
= 0;
554 str
= extract_word (str
, op
, sizeof (op
));
560 m
.ptr
= hash_find (avr_mod_hash
, op
);
568 str
= skip_space (str
);
572 bfd_reloc_code_real_type reloc_to_return
;
577 if (strncmp ("pm(", str
, 3) == 0
578 || strncmp ("gs(",str
,3) == 0
579 || strncmp ("-(gs(",str
,5) == 0
580 || strncmp ("-(pm(", str
, 5) == 0)
588 as_bad (_("illegal expression"));
590 if (str
[0] == 'g' || str
[2] == 'g')
591 linker_stubs_should_be_generated
= 1;
603 if (*str
== '-' && *(str
+ 1) == '(')
610 input_line_pointer
= str
;
615 if (*input_line_pointer
!= ')')
617 as_bad (_("`)' required"));
620 input_line_pointer
++;
625 neg_p
? EXP_MOD_NEG_RELOC (mod
) : EXP_MOD_RELOC (mod
);
626 if (linker_stubs_should_be_generated
)
628 switch (reloc_to_return
)
630 case BFD_RELOC_AVR_LO8_LDI_PM
:
631 reloc_to_return
= BFD_RELOC_AVR_LO8_LDI_GS
;
633 case BFD_RELOC_AVR_HI8_LDI_PM
:
634 reloc_to_return
= BFD_RELOC_AVR_HI8_LDI_GS
;
638 as_warn (_("expression dangerous with linker stubs"));
641 return reloc_to_return
;
646 input_line_pointer
= tmp
;
649 /* Warn about expressions that fail to use lo8 (). */
650 if (exp
->X_op
== O_constant
)
652 int x
= exp
->X_add_number
;
654 if (x
< -255 || x
> 255)
655 as_warn (_("constant out of 8-bit range: %d"), x
);
658 return BFD_RELOC_AVR_LDI
;
661 /* Parse one instruction operand.
662 Return operand bitmask. Also fixups can be generated. */
665 avr_operand (struct avr_opcodes_s
*opcode
,
671 unsigned int op_mask
= 0;
672 char *str
= skip_space (*line
);
676 /* Any register operand. */
682 if (*str
== 'r' || *str
== 'R')
686 str
= extract_word (str
, r_name
, sizeof (r_name
));
688 if (ISDIGIT (r_name
[1]))
690 if (r_name
[2] == '\0')
691 op_mask
= r_name
[1] - '0';
692 else if (r_name
[1] != '0'
693 && ISDIGIT (r_name
[2])
694 && r_name
[3] == '\0')
695 op_mask
= (r_name
[1] - '0') * 10 + r_name
[2] - '0';
700 op_mask
= avr_get_constant (str
, 31);
701 str
= input_line_pointer
;
709 if (op_mask
< 16 || op_mask
> 23)
710 as_bad (_("register r16-r23 required"));
716 as_bad (_("register number above 15 required"));
722 as_bad (_("even register number required"));
727 if ((op_mask
& 1) || op_mask
< 24)
728 as_bad (_("register r24, r26, r28 or r30 required"));
729 op_mask
= (op_mask
- 24) >> 1;
734 as_bad (_("register name or number from 0 to 31 required"));
743 str
= skip_space (str
+ 1);
752 as_bad (_("pointer register (X, Y or Z) required"));
754 str
= skip_space (str
+ 1);
759 as_bad (_("cannot both predecrement and postincrement"));
763 /* avr1 can do "ld r,Z" and "st Z,r" but no other pointer
764 registers, no predecrement, no postincrement. */
765 if (!avr_opt
.all_opcodes
&& (op_mask
& 0x100F)
766 && !(avr_mcu
->isa
& AVR_ISA_SRAM
))
767 as_bad (_("addressing mode not supported"));
773 as_bad (_("can't predecrement"));
775 if (! (*str
== 'z' || *str
== 'Z'))
776 as_bad (_("pointer register Z required"));
778 str
= skip_space (str
+ 1);
789 char c
= TOLOWER (*str
++);
794 as_bad (_("pointer register (Y or Z) required"));
795 str
= skip_space (str
);
798 input_line_pointer
= str
;
799 avr_offset_expression (& op_expr
);
800 str
= input_line_pointer
;
801 fix_new_exp (frag_now
, where
, 3,
802 &op_expr
, FALSE
, BFD_RELOC_AVR_6
);
808 str
= parse_exp (str
, &op_expr
);
809 fix_new_exp (frag_now
, where
, opcode
->insn_size
* 2,
810 &op_expr
, FALSE
, BFD_RELOC_AVR_CALL
);
814 str
= parse_exp (str
, &op_expr
);
815 fix_new_exp (frag_now
, where
, opcode
->insn_size
* 2,
816 &op_expr
, TRUE
, BFD_RELOC_AVR_13_PCREL
);
820 str
= parse_exp (str
, &op_expr
);
821 fix_new_exp (frag_now
, where
, opcode
->insn_size
* 2,
822 &op_expr
, TRUE
, BFD_RELOC_AVR_7_PCREL
);
826 str
= parse_exp (str
, &op_expr
);
827 fix_new_exp (frag_now
, where
+ 2, opcode
->insn_size
* 2,
828 &op_expr
, FALSE
, BFD_RELOC_16
);
833 bfd_reloc_code_real_type r_type
;
835 input_line_pointer
= str
;
836 r_type
= avr_ldi_expression (&op_expr
);
837 str
= input_line_pointer
;
838 fix_new_exp (frag_now
, where
, 3,
839 &op_expr
, FALSE
, r_type
);
847 x
= ~avr_get_constant (str
, 255);
848 str
= input_line_pointer
;
849 op_mask
|= (x
& 0xf) | ((x
<< 4) & 0xf00);
854 input_line_pointer
= str
;
855 avr_offset_expression (& op_expr
);
856 str
= input_line_pointer
;
857 fix_new_exp (frag_now
, where
, 3,
858 & op_expr
, FALSE
, BFD_RELOC_AVR_6_ADIW
);
866 x
= avr_get_constant (str
, 7);
867 str
= input_line_pointer
;
878 x
= avr_get_constant (str
, 63);
879 str
= input_line_pointer
;
880 op_mask
|= (x
& 0xf) | ((x
& 0x30) << 5);
888 x
= avr_get_constant (str
, 31);
889 str
= input_line_pointer
;
898 as_bad (_("unknown constraint `%c'"), *op
);
905 /* Parse instruction operands.
906 Return binary opcode. */
909 avr_operands (struct avr_opcodes_s
*opcode
, char **line
)
911 char *op
= opcode
->constraints
;
912 unsigned int bin
= opcode
->bin_opcode
;
913 char *frag
= frag_more (opcode
->insn_size
* 2);
915 int where
= frag
- frag_now
->fr_literal
;
916 static unsigned int prev
= 0; /* Previous opcode. */
918 /* Opcode have operands. */
921 unsigned int reg1
= 0;
922 unsigned int reg2
= 0;
923 int reg1_present
= 0;
924 int reg2_present
= 0;
926 /* Parse first operand. */
927 if (REGISTER_P (*op
))
929 reg1
= avr_operand (opcode
, where
, op
, &str
);
932 /* Parse second operand. */
945 if (REGISTER_P (*op
))
948 str
= skip_space (str
);
950 as_bad (_("`,' required"));
951 str
= skip_space (str
);
953 reg2
= avr_operand (opcode
, where
, op
, &str
);
956 if (reg1_present
&& reg2_present
)
957 reg2
= (reg2
& 0xf) | ((reg2
<< 5) & 0x200);
958 else if (reg2_present
)
966 /* Detect undefined combinations (like ld r31,Z+). */
967 if (!avr_opt
.all_opcodes
&& AVR_UNDEF_P (bin
))
968 as_warn (_("undefined combination of operands"));
970 if (opcode
->insn_size
== 2)
972 /* Warn if the previous opcode was cpse/sbic/sbis/sbrc/sbrs
973 (AVR core bug, fixed in the newer devices). */
974 if (!(avr_opt
.no_skip_bug
||
975 (avr_mcu
->isa
& (AVR_ISA_MUL
| AVR_ISA_MOVW
)))
976 && AVR_SKIP_P (prev
))
977 as_warn (_("skipping two-word instruction"));
979 bfd_putl32 ((bfd_vma
) bin
, frag
);
982 bfd_putl16 ((bfd_vma
) bin
, frag
);
989 /* GAS will call this function for each section at the end of the assembly,
990 to permit the CPU backend to adjust the alignment of a section. */
993 md_section_align (asection
*seg
, valueT addr
)
995 int align
= bfd_get_section_alignment (stdoutput
, seg
);
996 return ((addr
+ (1 << align
) - 1) & (-1 << align
));
999 /* If you define this macro, it should return the offset between the
1000 address of a PC relative fixup and the position from which the PC
1001 relative adjustment should be made. On many processors, the base
1002 of a PC relative instruction is the next instruction, so this
1003 macro would return the length of an instruction. */
1006 md_pcrel_from_section (fixS
*fixp
, segT sec
)
1008 if (fixp
->fx_addsy
!= (symbolS
*) NULL
1009 && (!S_IS_DEFINED (fixp
->fx_addsy
)
1010 || (S_GET_SEGMENT (fixp
->fx_addsy
) != sec
)))
1013 return fixp
->fx_frag
->fr_address
+ fixp
->fx_where
;
1016 /* GAS will call this for each fixup. It should store the correct
1017 value in the object file. */
1020 md_apply_fix (fixS
*fixP
, valueT
* valP
, segT seg
)
1022 unsigned char *where
;
1026 if (fixP
->fx_addsy
== (symbolS
*) NULL
)
1029 else if (fixP
->fx_pcrel
)
1031 segT s
= S_GET_SEGMENT (fixP
->fx_addsy
);
1033 if (s
== seg
|| s
== absolute_section
)
1035 value
+= S_GET_VALUE (fixP
->fx_addsy
);
1040 /* We don't actually support subtracting a symbol. */
1041 if (fixP
->fx_subsy
!= (symbolS
*) NULL
)
1042 as_bad_where (fixP
->fx_file
, fixP
->fx_line
, _("expression too complex"));
1044 switch (fixP
->fx_r_type
)
1047 fixP
->fx_no_overflow
= 1;
1049 case BFD_RELOC_AVR_7_PCREL
:
1050 case BFD_RELOC_AVR_13_PCREL
:
1053 case BFD_RELOC_AVR_CALL
:
1059 /* Fetch the instruction, insert the fully resolved operand
1060 value, and stuff the instruction back again. */
1061 where
= (unsigned char *) fixP
->fx_frag
->fr_literal
+ fixP
->fx_where
;
1062 insn
= bfd_getl16 (where
);
1064 switch (fixP
->fx_r_type
)
1066 case BFD_RELOC_AVR_7_PCREL
:
1068 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1069 _("odd address operand: %ld"), value
);
1071 /* Instruction addresses are always right-shifted by 1. */
1073 --value
; /* Correct PC. */
1075 if (value
< -64 || value
> 63)
1076 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1077 _("operand out of range: %ld"), value
);
1078 value
= (value
<< 3) & 0x3f8;
1079 bfd_putl16 ((bfd_vma
) (value
| insn
), where
);
1082 case BFD_RELOC_AVR_13_PCREL
:
1084 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1085 _("odd address operand: %ld"), value
);
1087 /* Instruction addresses are always right-shifted by 1. */
1089 --value
; /* Correct PC. */
1091 if (value
< -2048 || value
> 2047)
1093 /* No wrap for devices with >8K of program memory. */
1094 if ((avr_mcu
->isa
& AVR_ISA_MEGA
) || avr_opt
.no_wrap
)
1095 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1096 _("operand out of range: %ld"), value
);
1100 bfd_putl16 ((bfd_vma
) (value
| insn
), where
);
1104 bfd_putl16 ((bfd_vma
) value
, where
);
1108 bfd_putl16 ((bfd_vma
) value
, where
);
1111 case BFD_RELOC_AVR_16_PM
:
1112 bfd_putl16 ((bfd_vma
) (value
>> 1), where
);
1115 case BFD_RELOC_AVR_LDI
:
1117 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1118 _("operand out of range: %ld"), value
);
1119 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
), where
);
1122 case BFD_RELOC_AVR_6
:
1123 if ((value
> 63) || (value
< 0))
1124 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1125 _("operand out of range: %ld"), value
);
1126 bfd_putl16 ((bfd_vma
) insn
| ((value
& 7) | ((value
& (3 << 3)) << 7) | ((value
& (1 << 5)) << 8)), where
);
1129 case BFD_RELOC_AVR_6_ADIW
:
1130 if ((value
> 63) || (value
< 0))
1131 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1132 _("operand out of range: %ld"), value
);
1133 bfd_putl16 ((bfd_vma
) insn
| (value
& 0xf) | ((value
& 0x30) << 2), where
);
1136 case BFD_RELOC_AVR_LO8_LDI
:
1137 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
), where
);
1140 case BFD_RELOC_AVR_HI8_LDI
:
1141 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 8), where
);
1144 case BFD_RELOC_AVR_MS8_LDI
:
1145 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 24), where
);
1148 case BFD_RELOC_AVR_HH8_LDI
:
1149 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 16), where
);
1152 case BFD_RELOC_AVR_LO8_LDI_NEG
:
1153 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
), where
);
1156 case BFD_RELOC_AVR_HI8_LDI_NEG
:
1157 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 8), where
);
1160 case BFD_RELOC_AVR_MS8_LDI_NEG
:
1161 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 24), where
);
1164 case BFD_RELOC_AVR_HH8_LDI_NEG
:
1165 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 16), where
);
1168 case BFD_RELOC_AVR_LO8_LDI_PM
:
1169 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 1), where
);
1172 case BFD_RELOC_AVR_HI8_LDI_PM
:
1173 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 9), where
);
1176 case BFD_RELOC_AVR_HH8_LDI_PM
:
1177 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 17), where
);
1180 case BFD_RELOC_AVR_LO8_LDI_PM_NEG
:
1181 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 1), where
);
1184 case BFD_RELOC_AVR_HI8_LDI_PM_NEG
:
1185 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 9), where
);
1188 case BFD_RELOC_AVR_HH8_LDI_PM_NEG
:
1189 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 17), where
);
1192 case BFD_RELOC_AVR_CALL
:
1196 x
= bfd_getl16 (where
);
1198 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1199 _("odd address operand: %ld"), value
);
1201 x
|= ((value
& 0x10000) | ((value
<< 3) & 0x1f00000)) >> 16;
1202 bfd_putl16 ((bfd_vma
) x
, where
);
1203 bfd_putl16 ((bfd_vma
) (value
& 0xffff), where
+ 2);
1208 as_fatal (_("line %d: unknown relocation type: 0x%x"),
1209 fixP
->fx_line
, fixP
->fx_r_type
);
1215 switch (fixP
->fx_r_type
)
1217 case -BFD_RELOC_AVR_HI8_LDI_NEG
:
1218 case -BFD_RELOC_AVR_HI8_LDI
:
1219 case -BFD_RELOC_AVR_LO8_LDI_NEG
:
1220 case -BFD_RELOC_AVR_LO8_LDI
:
1221 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1222 _("only constant expression allowed"));
1231 /* GAS will call this to generate a reloc, passing the resulting reloc
1232 to `bfd_install_relocation'. This currently works poorly, as
1233 `bfd_install_relocation' often does the wrong thing, and instances of
1234 `tc_gen_reloc' have been written to work around the problems, which
1235 in turns makes it difficult to fix `bfd_install_relocation'. */
1237 /* If while processing a fixup, a reloc really needs to be created
1238 then it is done here. */
1241 tc_gen_reloc (asection
*seg ATTRIBUTE_UNUSED
,
1246 if (fixp
->fx_addsy
&& fixp
->fx_subsy
)
1250 if ((S_GET_SEGMENT (fixp
->fx_addsy
) != S_GET_SEGMENT (fixp
->fx_subsy
))
1251 || S_GET_SEGMENT (fixp
->fx_addsy
) == undefined_section
)
1253 as_bad_where (fixp
->fx_file
, fixp
->fx_line
,
1254 "Difference of symbols in different sections is not supported");
1258 /* We are dealing with two symbols defined in the same section.
1259 Let us fix-up them here. */
1260 value
+= S_GET_VALUE (fixp
->fx_addsy
);
1261 value
-= S_GET_VALUE (fixp
->fx_subsy
);
1263 /* When fx_addsy and fx_subsy both are zero, md_apply_fix
1264 only takes it's second operands for the fixup value. */
1265 fixp
->fx_addsy
= NULL
;
1266 fixp
->fx_subsy
= NULL
;
1267 md_apply_fix (fixp
, (valueT
*) &value
, NULL
);
1272 reloc
= xmalloc (sizeof (arelent
));
1274 reloc
->sym_ptr_ptr
= xmalloc (sizeof (asymbol
*));
1275 *reloc
->sym_ptr_ptr
= symbol_get_bfdsym (fixp
->fx_addsy
);
1277 reloc
->address
= fixp
->fx_frag
->fr_address
+ fixp
->fx_where
;
1278 reloc
->howto
= bfd_reloc_type_lookup (stdoutput
, fixp
->fx_r_type
);
1279 if (reloc
->howto
== (reloc_howto_type
*) NULL
)
1281 as_bad_where (fixp
->fx_file
, fixp
->fx_line
,
1282 _("reloc %d not supported by object file format"),
1283 (int) fixp
->fx_r_type
);
1287 if (fixp
->fx_r_type
== BFD_RELOC_VTABLE_INHERIT
1288 || fixp
->fx_r_type
== BFD_RELOC_VTABLE_ENTRY
)
1289 reloc
->address
= fixp
->fx_offset
;
1291 reloc
->addend
= fixp
->fx_offset
;
1297 md_assemble (char *str
)
1299 struct avr_opcodes_s
*opcode
;
1302 str
= skip_space (extract_word (str
, op
, sizeof (op
)));
1305 as_bad (_("can't find opcode "));
1307 opcode
= (struct avr_opcodes_s
*) hash_find (avr_hash
, op
);
1311 as_bad (_("unknown opcode `%s'"), op
);
1315 /* Special case for opcodes with optional operands (lpm, elpm) -
1316 version with operands exists in avr_opcodes[] in the next entry. */
1318 if (*str
&& *opcode
->constraints
== '?')
1321 if (!avr_opt
.all_opcodes
&& (opcode
->isa
& avr_mcu
->isa
) != opcode
->isa
)
1322 as_bad (_("illegal opcode %s for mcu %s"), opcode
->name
, avr_mcu
->name
);
1324 /* We used to set input_line_pointer to the result of get_operands,
1325 but that is wrong. Our caller assumes we don't change it. */
1327 char *t
= input_line_pointer
;
1329 avr_operands (opcode
, &str
);
1330 if (*skip_space (str
))
1331 as_bad (_("garbage at end of line"));
1332 input_line_pointer
= t
;
1336 /* Flag to pass `pm' mode between `avr_parse_cons_expression' and
1337 `avr_cons_fix_new'. */
1338 static int exp_mod_pm
= 0;
1340 /* Parse special CONS expression: pm (expression)
1341 or alternatively: gs (expression).
1342 These are used for addressing program memory.
1343 Relocation: BFD_RELOC_AVR_16_PM. */
1346 avr_parse_cons_expression (expressionS
*exp
, int nbytes
)
1352 tmp
= input_line_pointer
= skip_space (input_line_pointer
);
1356 char *pm_name1
= "pm";
1357 char *pm_name2
= "gs";
1358 int len
= strlen (pm_name1
);
1359 /* len must be the same for both pm identifiers. */
1361 if (strncasecmp (input_line_pointer
, pm_name1
, len
) == 0
1362 || strncasecmp (input_line_pointer
, pm_name2
, len
) == 0)
1364 input_line_pointer
= skip_space (input_line_pointer
+ len
);
1366 if (*input_line_pointer
== '(')
1368 input_line_pointer
= skip_space (input_line_pointer
+ 1);
1372 if (*input_line_pointer
== ')')
1373 ++input_line_pointer
;
1376 as_bad (_("`)' required"));
1383 input_line_pointer
= tmp
;
1391 avr_cons_fix_new (fragS
*frag
,
1396 if (exp_mod_pm
== 0)
1399 fix_new_exp (frag
, where
, nbytes
, exp
, FALSE
, BFD_RELOC_16
);
1400 else if (nbytes
== 4)
1401 fix_new_exp (frag
, where
, nbytes
, exp
, FALSE
, BFD_RELOC_32
);
1403 as_bad (_("illegal %srelocation size: %d"), "", nbytes
);
1408 fix_new_exp (frag
, where
, nbytes
, exp
, FALSE
, BFD_RELOC_AVR_16_PM
);
1410 as_bad (_("illegal %srelocation size: %d"), "`pm' ", nbytes
);