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. */
25 #include "safe-ctype.h"
32 int insn_size
; /* In words. */
34 unsigned int bin_opcode
;
37 #define AVR_INSN(NAME, CONSTR, OPCODE, SIZE, ISA, BIN) \
38 {#NAME, CONSTR, SIZE, ISA, BIN},
40 struct avr_opcodes_s avr_opcodes
[] =
42 #include "opcode/avr.h"
46 const char comment_chars
[] = ";";
47 const char line_comment_chars
[] = "#";
48 const char line_separator_chars
[] = "$";
50 const char *md_shortopts
= "m:";
58 /* XXX - devices that don't seem to exist (renamed, replaced with larger
59 ones, or planned but never produced), left here for compatibility.
60 TODO: hide them in show_mcu_list output? */
62 static struct mcu_type_s mcu_types
[] =
64 {"avr1", AVR_ISA_TINY1
, bfd_mach_avr1
},
65 {"avr2", AVR_ISA_TINY2
, bfd_mach_avr2
},
66 {"avr3", AVR_ISA_M103
, bfd_mach_avr3
},
67 {"avr4", AVR_ISA_M8
, bfd_mach_avr4
},
68 {"avr5", AVR_ISA_ALL
, bfd_mach_avr5
},
69 {"avr6", AVR_ISA_ALL
, bfd_mach_avr6
},
70 {"at90s1200", AVR_ISA_1200
, bfd_mach_avr1
},
71 {"attiny10", AVR_ISA_TINY1
, bfd_mach_avr1
}, /* XXX -> tn11 */
72 {"attiny11", AVR_ISA_TINY1
, bfd_mach_avr1
},
73 {"attiny12", AVR_ISA_TINY1
, bfd_mach_avr1
},
74 {"attiny15", AVR_ISA_TINY1
, bfd_mach_avr1
},
75 {"attiny28", AVR_ISA_TINY1
, bfd_mach_avr1
},
76 {"at90s2313", AVR_ISA_2xxx
, bfd_mach_avr2
},
77 {"at90s2323", AVR_ISA_2xxx
, bfd_mach_avr2
},
78 {"at90s2333", AVR_ISA_2xxx
, bfd_mach_avr2
}, /* XXX -> 4433 */
79 {"at90s2343", AVR_ISA_2xxx
, bfd_mach_avr2
},
80 {"attiny22", AVR_ISA_2xxx
, bfd_mach_avr2
}, /* XXX -> 2343 */
81 {"attiny26", AVR_ISA_2xxx
, bfd_mach_avr2
},
82 {"at90s4433", AVR_ISA_2xxx
, bfd_mach_avr2
},
83 {"at90s4414", AVR_ISA_2xxx
, bfd_mach_avr2
}, /* XXX -> 8515 */
84 {"at90s4434", AVR_ISA_2xxx
, bfd_mach_avr2
}, /* XXX -> 8535 */
85 {"at90s8515", AVR_ISA_2xxx
, bfd_mach_avr2
},
86 {"at90s8535", AVR_ISA_2xxx
, bfd_mach_avr2
},
87 {"at90c8534", AVR_ISA_2xxx
, bfd_mach_avr2
},
88 {"at86rf401", AVR_ISA_2xxx
, bfd_mach_avr2
},
89 {"attiny13", AVR_ISA_TINY2
, bfd_mach_avr2
},
90 {"attiny2313", AVR_ISA_TINY2
, bfd_mach_avr2
},
91 {"attiny261", AVR_ISA_TINY2
, bfd_mach_avr2
},
92 {"attiny461", AVR_ISA_TINY2
, bfd_mach_avr2
},
93 {"attiny861", AVR_ISA_TINY2
, bfd_mach_avr2
},
94 {"attiny24", AVR_ISA_TINY2
, bfd_mach_avr2
},
95 {"attiny44", AVR_ISA_TINY2
, bfd_mach_avr2
},
96 {"attiny84", AVR_ISA_TINY2
, bfd_mach_avr2
},
97 {"attiny25", AVR_ISA_TINY2
, bfd_mach_avr2
},
98 {"attiny45", AVR_ISA_TINY2
, bfd_mach_avr2
},
99 {"attiny85", AVR_ISA_TINY2
, bfd_mach_avr2
},
100 {"atmega603", AVR_ISA_M603
, bfd_mach_avr3
}, /* XXX -> m103 */
101 {"atmega103", AVR_ISA_M103
, bfd_mach_avr3
},
102 {"at43usb320", AVR_ISA_M103
, bfd_mach_avr3
},
103 {"at43usb355", AVR_ISA_M603
, bfd_mach_avr3
},
104 {"at76c711", AVR_ISA_M603
, bfd_mach_avr3
},
105 {"atmega48", AVR_ISA_PWMx
, bfd_mach_avr4
},
106 {"atmega8", AVR_ISA_M8
, bfd_mach_avr4
},
107 {"atmega83", AVR_ISA_M8
, bfd_mach_avr4
}, /* XXX -> m8535 */
108 {"atmega85", AVR_ISA_M8
, bfd_mach_avr4
}, /* XXX -> m8 */
109 {"atmega88", AVR_ISA_PWMx
, bfd_mach_avr4
},
110 {"atmega8515", AVR_ISA_M8
, bfd_mach_avr4
},
111 {"atmega8535", AVR_ISA_M8
, bfd_mach_avr4
},
112 {"at90pwm1", AVR_ISA_PWMx
, bfd_mach_avr4
},
113 {"at90pwm2", AVR_ISA_PWMx
, bfd_mach_avr4
},
114 {"at90pwm3", AVR_ISA_PWMx
, bfd_mach_avr4
},
115 {"at90usb82", 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 {"atmega164p", AVR_ISA_M323
, bfd_mach_avr5
},
121 {"atmega165", AVR_ISA_M323
, bfd_mach_avr5
},
122 {"atmega165p", AVR_ISA_M323
, bfd_mach_avr5
},
123 {"atmega168", AVR_ISA_M323
, bfd_mach_avr5
},
124 {"atmega169", AVR_ISA_M323
, bfd_mach_avr5
},
125 {"atmega169p", AVR_ISA_M323
, bfd_mach_avr5
},
126 {"atmega32", AVR_ISA_M323
, bfd_mach_avr5
},
127 {"atmega323", AVR_ISA_M323
, bfd_mach_avr5
},
128 {"atmega324p", AVR_ISA_M323
, bfd_mach_avr5
},
129 {"atmega325", AVR_ISA_M323
, bfd_mach_avr5
},
130 {"atmega325p", AVR_ISA_M323
, bfd_mach_avr5
},
131 {"atmega329", AVR_ISA_M323
, bfd_mach_avr5
},
132 {"atmega329p", AVR_ISA_M323
, bfd_mach_avr5
},
133 {"atmega3250", AVR_ISA_M323
, bfd_mach_avr5
},
134 {"atmega3250p",AVR_ISA_M323
, bfd_mach_avr5
},
135 {"atmega3290", AVR_ISA_M323
, bfd_mach_avr5
},
136 {"atmega3290p",AVR_ISA_M323
, bfd_mach_avr5
},
137 {"atmega406", AVR_ISA_M323
, bfd_mach_avr5
},
138 {"atmega64", AVR_ISA_M323
, bfd_mach_avr5
},
139 {"atmega640", AVR_ISA_M323
, bfd_mach_avr5
},
140 {"atmega644", AVR_ISA_M323
, bfd_mach_avr5
},
141 {"atmega644p", AVR_ISA_M323
, bfd_mach_avr5
},
142 {"atmega128", AVR_ISA_M128
, bfd_mach_avr5
},
143 {"atmega1280", AVR_ISA_M128
, bfd_mach_avr5
},
144 {"atmega1281", AVR_ISA_M128
, bfd_mach_avr5
},
145 {"atmega645", AVR_ISA_M323
, bfd_mach_avr5
},
146 {"atmega649", AVR_ISA_M323
, bfd_mach_avr5
},
147 {"atmega6450", AVR_ISA_M323
, bfd_mach_avr5
},
148 {"atmega6490", AVR_ISA_M323
, bfd_mach_avr5
},
149 {"at90can32" , AVR_ISA_M323
, bfd_mach_avr5
},
150 {"at90can64" , AVR_ISA_M323
, bfd_mach_avr5
},
151 {"at90can128", AVR_ISA_M128
, bfd_mach_avr5
},
152 {"at90usb162", AVR_ISA_M323
, bfd_mach_avr5
},
153 {"at90usb646", AVR_ISA_M323
, bfd_mach_avr5
},
154 {"at90usb647", AVR_ISA_M323
, bfd_mach_avr5
},
155 {"at90usb1286",AVR_ISA_M128
, bfd_mach_avr5
},
156 {"at90usb1287",AVR_ISA_M128
, bfd_mach_avr5
},
157 {"at94k", AVR_ISA_94K
, bfd_mach_avr5
},
158 {"atmega2560", AVR_ISA_ALL
, bfd_mach_avr6
},
159 {"atmega2561", AVR_ISA_ALL
, bfd_mach_avr6
},
163 /* Current MCU type. */
164 static struct mcu_type_s default_mcu
= {"avr2", AVR_ISA_2xxx
,bfd_mach_avr2
};
165 static struct mcu_type_s
* avr_mcu
= & default_mcu
;
167 /* AVR target-specific switches. */
170 int all_opcodes
; /* -mall-opcodes: accept all known AVR opcodes. */
171 int no_skip_bug
; /* -mno-skip-bug: no warnings for skipping 2-word insns. */
172 int no_wrap
; /* -mno-wrap: reject rjmp/rcall with 8K wrap-around. */
175 static struct avr_opt_s avr_opt
= { 0, 0, 0 };
177 const char EXP_CHARS
[] = "eE";
178 const char FLT_CHARS
[] = "dD";
180 static void avr_set_arch (int);
182 /* The target specific pseudo-ops which we support. */
183 const pseudo_typeS md_pseudo_table
[] =
185 {"arch", avr_set_arch
, 0},
189 #define LDI_IMMEDIATE(x) (((x) & 0xf) | (((x) << 4) & 0xf00))
191 #define EXP_MOD_NAME(i) exp_mod[i].name
192 #define EXP_MOD_RELOC(i) exp_mod[i].reloc
193 #define EXP_MOD_NEG_RELOC(i) exp_mod[i].neg_reloc
194 #define HAVE_PM_P(i) exp_mod[i].have_pm
199 bfd_reloc_code_real_type reloc
;
200 bfd_reloc_code_real_type neg_reloc
;
204 static struct exp_mod_s exp_mod
[] =
206 {"hh8", BFD_RELOC_AVR_HH8_LDI
, BFD_RELOC_AVR_HH8_LDI_NEG
, 1},
207 {"pm_hh8", BFD_RELOC_AVR_HH8_LDI_PM
, BFD_RELOC_AVR_HH8_LDI_PM_NEG
, 0},
208 {"hi8", BFD_RELOC_AVR_HI8_LDI
, BFD_RELOC_AVR_HI8_LDI_NEG
, 1},
209 {"pm_hi8", BFD_RELOC_AVR_HI8_LDI_PM
, BFD_RELOC_AVR_HI8_LDI_PM_NEG
, 0},
210 {"lo8", BFD_RELOC_AVR_LO8_LDI
, BFD_RELOC_AVR_LO8_LDI_NEG
, 1},
211 {"pm_lo8", BFD_RELOC_AVR_LO8_LDI_PM
, BFD_RELOC_AVR_LO8_LDI_PM_NEG
, 0},
212 {"hlo8", BFD_RELOC_AVR_HH8_LDI
, BFD_RELOC_AVR_HH8_LDI_NEG
, 0},
213 {"hhi8", BFD_RELOC_AVR_MS8_LDI
, BFD_RELOC_AVR_MS8_LDI_NEG
, 0},
216 /* A union used to store indicies into the exp_mod[] array
217 in a hash table which expects void * data types. */
224 /* Opcode hash table. */
225 static struct hash_control
*avr_hash
;
227 /* Reloc modifiers hash control (hh8,hi8,lo8,pm_xx). */
228 static struct hash_control
*avr_mod_hash
;
230 #define OPTION_MMCU 'm'
233 OPTION_ALL_OPCODES
= OPTION_MD_BASE
+ 1,
238 struct option md_longopts
[] =
240 { "mmcu", required_argument
, NULL
, OPTION_MMCU
},
241 { "mall-opcodes", no_argument
, NULL
, OPTION_ALL_OPCODES
},
242 { "mno-skip-bug", no_argument
, NULL
, OPTION_NO_SKIP_BUG
},
243 { "mno-wrap", no_argument
, NULL
, OPTION_NO_WRAP
},
244 { NULL
, no_argument
, NULL
, 0 }
247 size_t md_longopts_size
= sizeof (md_longopts
);
249 /* Display nicely formatted list of known MCU names. */
252 show_mcu_list (FILE *stream
)
256 fprintf (stream
, _("Known MCU names:"));
259 for (i
= 0; mcu_types
[i
].name
; i
++)
261 int len
= strlen (mcu_types
[i
].name
);
266 fprintf (stream
, " %s", mcu_types
[i
].name
);
269 fprintf (stream
, "\n %s", mcu_types
[i
].name
);
274 fprintf (stream
, "\n");
280 while (*s
== ' ' || *s
== '\t')
285 /* Extract one word from FROM and copy it to TO. */
288 extract_word (char *from
, char *to
, int limit
)
294 /* Drop leading whitespace. */
295 from
= skip_space (from
);
298 /* Find the op code end. */
299 for (op_start
= op_end
= from
; *op_end
!= 0 && is_part_of_name (*op_end
);)
301 to
[size
++] = *op_end
++;
302 if (size
+ 1 >= limit
)
311 md_estimate_size_before_relax (fragS
*fragp ATTRIBUTE_UNUSED
,
312 asection
*seg ATTRIBUTE_UNUSED
)
319 md_show_usage (FILE *stream
)
323 " -mmcu=[avr-name] select microcontroller variant\n"
324 " [avr-name] can be:\n"
325 " avr1 - AT90S1200, ATtiny1x, ATtiny28\n"
326 " avr2 - AT90S2xxx, AT90S4xxx, AT90S8xxx, ATtiny22\n"
327 " avr3 - ATmega103, ATmega603\n"
328 " avr4 - ATmega83, ATmega85\n"
329 " avr5 - ATmega161, ATmega163, ATmega32, AT94K\n"
330 " or immediate microcontroller name.\n"));
332 _(" -mall-opcodes accept all AVR opcodes, even if not supported by MCU\n"
333 " -mno-skip-bug disable warnings for skipping two-word instructions\n"
334 " (default for avr4, avr5)\n"
335 " -mno-wrap reject rjmp/rcall instructions with 8K wrap-around\n"
336 " (default for avr3, avr5)\n"));
337 show_mcu_list (stream
);
341 avr_set_arch (int dummy ATTRIBUTE_UNUSED
)
345 input_line_pointer
= extract_word (input_line_pointer
, str
, 20);
346 md_parse_option (OPTION_MMCU
, str
);
347 bfd_set_arch_mach (stdoutput
, TARGET_ARCH
, avr_mcu
->mach
);
351 md_parse_option (int c
, char *arg
)
358 char *s
= alloca (strlen (arg
) + 1);
365 *t
= TOLOWER (*arg1
++);
369 for (i
= 0; mcu_types
[i
].name
; ++i
)
370 if (strcmp (mcu_types
[i
].name
, s
) == 0)
373 if (!mcu_types
[i
].name
)
375 show_mcu_list (stderr
);
376 as_fatal (_("unknown MCU: %s\n"), arg
);
379 /* It is OK to redefine mcu type within the same avr[1-5] bfd machine
380 type - this for allows passing -mmcu=... via gcc ASM_SPEC as well
381 as .arch ... in the asm output at the same time. */
382 if (avr_mcu
== &default_mcu
|| avr_mcu
->mach
== mcu_types
[i
].mach
)
383 avr_mcu
= &mcu_types
[i
];
385 as_fatal (_("redefinition of mcu type `%s' to `%s'"),
386 avr_mcu
->name
, mcu_types
[i
].name
);
389 case OPTION_ALL_OPCODES
:
390 avr_opt
.all_opcodes
= 1;
392 case OPTION_NO_SKIP_BUG
:
393 avr_opt
.no_skip_bug
= 1;
404 md_undefined_symbol (char *name ATTRIBUTE_UNUSED
)
409 /* Turn a string in input_line_pointer into a floating point constant
410 of type TYPE, and store the appropriate bytes in *LITP. The number
411 of LITTLENUMS emitted is stored in *SIZEP. An error message is
412 returned, or NULL on OK. */
415 md_atof (int type
, char *litP
, int *sizeP
)
418 LITTLENUM_TYPE words
[4];
419 LITTLENUM_TYPE
*wordP
;
432 return _("bad call to md_atof");
435 t
= atof_ieee (input_line_pointer
, type
, words
);
437 input_line_pointer
= t
;
439 *sizeP
= prec
* sizeof (LITTLENUM_TYPE
);
441 /* This loop outputs the LITTLENUMs in REVERSE order. */
442 for (wordP
= words
+ prec
- 1; prec
--;)
444 md_number_to_chars (litP
, (valueT
) (*wordP
--), sizeof (LITTLENUM_TYPE
));
445 litP
+= sizeof (LITTLENUM_TYPE
);
452 md_convert_frag (bfd
*abfd ATTRIBUTE_UNUSED
,
453 asection
*sec ATTRIBUTE_UNUSED
,
454 fragS
*fragP ATTRIBUTE_UNUSED
)
463 struct avr_opcodes_s
*opcode
;
465 avr_hash
= hash_new ();
467 /* Insert unique names into hash table. This hash table then provides a
468 quick index to the first opcode with a particular name in the opcode
470 for (opcode
= avr_opcodes
; opcode
->name
; opcode
++)
471 hash_insert (avr_hash
, opcode
->name
, (char *) opcode
);
473 avr_mod_hash
= hash_new ();
475 for (i
= 0; i
< ARRAY_SIZE (exp_mod
); ++i
)
480 hash_insert (avr_mod_hash
, EXP_MOD_NAME (i
), m
.ptr
);
483 bfd_set_arch_mach (stdoutput
, TARGET_ARCH
, avr_mcu
->mach
);
486 /* Resolve STR as a constant expression and return the result.
487 If result greater than MAX then error. */
490 avr_get_constant (char *str
, int max
)
494 str
= skip_space (str
);
495 input_line_pointer
= str
;
498 if (ex
.X_op
!= O_constant
)
499 as_bad (_("constant value required"));
501 if (ex
.X_add_number
> max
|| ex
.X_add_number
< 0)
502 as_bad (_("number must be less than %d"), max
+ 1);
504 return ex
.X_add_number
;
507 /* Parse for ldd/std offset. */
510 avr_offset_expression (expressionS
*exp
)
512 char *str
= input_line_pointer
;
517 str
= extract_word (str
, op
, sizeof (op
));
519 input_line_pointer
= tmp
;
522 /* Warn about expressions that fail to use lo8 (). */
523 if (exp
->X_op
== O_constant
)
525 int x
= exp
->X_add_number
;
527 if (x
< -255 || x
> 255)
528 as_warn (_("constant out of 8-bit range: %d"), x
);
532 /* Parse ordinary expression. */
535 parse_exp (char *s
, expressionS
*op
)
537 input_line_pointer
= s
;
539 if (op
->X_op
== O_absent
)
540 as_bad (_("missing operand"));
541 return input_line_pointer
;
544 /* Parse special expressions (needed for LDI command):
549 where xx is: hh, hi, lo. */
551 static bfd_reloc_code_real_type
552 avr_ldi_expression (expressionS
*exp
)
554 char *str
= input_line_pointer
;
558 int linker_stubs_should_be_generated
= 0;
562 str
= extract_word (str
, op
, sizeof (op
));
568 m
.ptr
= hash_find (avr_mod_hash
, op
);
576 str
= skip_space (str
);
580 bfd_reloc_code_real_type reloc_to_return
;
585 if (strncmp ("pm(", str
, 3) == 0
586 || strncmp ("gs(",str
,3) == 0
587 || strncmp ("-(gs(",str
,5) == 0
588 || strncmp ("-(pm(", str
, 5) == 0)
596 as_bad (_("illegal expression"));
598 if (str
[0] == 'g' || str
[2] == 'g')
599 linker_stubs_should_be_generated
= 1;
611 if (*str
== '-' && *(str
+ 1) == '(')
618 input_line_pointer
= str
;
623 if (*input_line_pointer
!= ')')
625 as_bad (_("`)' required"));
628 input_line_pointer
++;
633 neg_p
? EXP_MOD_NEG_RELOC (mod
) : EXP_MOD_RELOC (mod
);
634 if (linker_stubs_should_be_generated
)
636 switch (reloc_to_return
)
638 case BFD_RELOC_AVR_LO8_LDI_PM
:
639 reloc_to_return
= BFD_RELOC_AVR_LO8_LDI_GS
;
641 case BFD_RELOC_AVR_HI8_LDI_PM
:
642 reloc_to_return
= BFD_RELOC_AVR_HI8_LDI_GS
;
646 as_warn (_("expression dangerous with linker stubs"));
649 return reloc_to_return
;
654 input_line_pointer
= tmp
;
657 /* Warn about expressions that fail to use lo8 (). */
658 if (exp
->X_op
== O_constant
)
660 int x
= exp
->X_add_number
;
662 if (x
< -255 || x
> 255)
663 as_warn (_("constant out of 8-bit range: %d"), x
);
666 return BFD_RELOC_AVR_LDI
;
669 /* Parse one instruction operand.
670 Return operand bitmask. Also fixups can be generated. */
673 avr_operand (struct avr_opcodes_s
*opcode
,
679 unsigned int op_mask
= 0;
680 char *str
= skip_space (*line
);
684 /* Any register operand. */
690 if (*str
== 'r' || *str
== 'R')
694 str
= extract_word (str
, r_name
, sizeof (r_name
));
696 if (ISDIGIT (r_name
[1]))
698 if (r_name
[2] == '\0')
699 op_mask
= r_name
[1] - '0';
700 else if (r_name
[1] != '0'
701 && ISDIGIT (r_name
[2])
702 && r_name
[3] == '\0')
703 op_mask
= (r_name
[1] - '0') * 10 + r_name
[2] - '0';
708 op_mask
= avr_get_constant (str
, 31);
709 str
= input_line_pointer
;
717 if (op_mask
< 16 || op_mask
> 23)
718 as_bad (_("register r16-r23 required"));
724 as_bad (_("register number above 15 required"));
730 as_bad (_("even register number required"));
735 if ((op_mask
& 1) || op_mask
< 24)
736 as_bad (_("register r24, r26, r28 or r30 required"));
737 op_mask
= (op_mask
- 24) >> 1;
742 as_bad (_("register name or number from 0 to 31 required"));
751 str
= skip_space (str
+ 1);
760 as_bad (_("pointer register (X, Y or Z) required"));
762 str
= skip_space (str
+ 1);
767 as_bad (_("cannot both predecrement and postincrement"));
771 /* avr1 can do "ld r,Z" and "st Z,r" but no other pointer
772 registers, no predecrement, no postincrement. */
773 if (!avr_opt
.all_opcodes
&& (op_mask
& 0x100F)
774 && !(avr_mcu
->isa
& AVR_ISA_SRAM
))
775 as_bad (_("addressing mode not supported"));
781 as_bad (_("can't predecrement"));
783 if (! (*str
== 'z' || *str
== 'Z'))
784 as_bad (_("pointer register Z required"));
786 str
= skip_space (str
+ 1);
797 char c
= TOLOWER (*str
++);
802 as_bad (_("pointer register (Y or Z) required"));
803 str
= skip_space (str
);
806 input_line_pointer
= str
;
807 avr_offset_expression (& op_expr
);
808 str
= input_line_pointer
;
809 fix_new_exp (frag_now
, where
, 3,
810 &op_expr
, FALSE
, BFD_RELOC_AVR_6
);
816 str
= parse_exp (str
, &op_expr
);
817 fix_new_exp (frag_now
, where
, opcode
->insn_size
* 2,
818 &op_expr
, FALSE
, BFD_RELOC_AVR_CALL
);
822 str
= parse_exp (str
, &op_expr
);
823 fix_new_exp (frag_now
, where
, opcode
->insn_size
* 2,
824 &op_expr
, TRUE
, BFD_RELOC_AVR_13_PCREL
);
828 str
= parse_exp (str
, &op_expr
);
829 fix_new_exp (frag_now
, where
, opcode
->insn_size
* 2,
830 &op_expr
, TRUE
, BFD_RELOC_AVR_7_PCREL
);
834 str
= parse_exp (str
, &op_expr
);
835 fix_new_exp (frag_now
, where
+ 2, opcode
->insn_size
* 2,
836 &op_expr
, FALSE
, BFD_RELOC_16
);
841 bfd_reloc_code_real_type r_type
;
843 input_line_pointer
= str
;
844 r_type
= avr_ldi_expression (&op_expr
);
845 str
= input_line_pointer
;
846 fix_new_exp (frag_now
, where
, 3,
847 &op_expr
, FALSE
, r_type
);
855 x
= ~avr_get_constant (str
, 255);
856 str
= input_line_pointer
;
857 op_mask
|= (x
& 0xf) | ((x
<< 4) & 0xf00);
862 input_line_pointer
= str
;
863 avr_offset_expression (& op_expr
);
864 str
= input_line_pointer
;
865 fix_new_exp (frag_now
, where
, 3,
866 & op_expr
, FALSE
, BFD_RELOC_AVR_6_ADIW
);
874 x
= avr_get_constant (str
, 7);
875 str
= input_line_pointer
;
886 x
= avr_get_constant (str
, 63);
887 str
= input_line_pointer
;
888 op_mask
|= (x
& 0xf) | ((x
& 0x30) << 5);
896 x
= avr_get_constant (str
, 31);
897 str
= input_line_pointer
;
906 as_bad (_("unknown constraint `%c'"), *op
);
913 /* Parse instruction operands.
914 Return binary opcode. */
917 avr_operands (struct avr_opcodes_s
*opcode
, char **line
)
919 char *op
= opcode
->constraints
;
920 unsigned int bin
= opcode
->bin_opcode
;
921 char *frag
= frag_more (opcode
->insn_size
* 2);
923 int where
= frag
- frag_now
->fr_literal
;
924 static unsigned int prev
= 0; /* Previous opcode. */
926 /* Opcode have operands. */
929 unsigned int reg1
= 0;
930 unsigned int reg2
= 0;
931 int reg1_present
= 0;
932 int reg2_present
= 0;
934 /* Parse first operand. */
935 if (REGISTER_P (*op
))
937 reg1
= avr_operand (opcode
, where
, op
, &str
);
940 /* Parse second operand. */
953 if (REGISTER_P (*op
))
956 str
= skip_space (str
);
958 as_bad (_("`,' required"));
959 str
= skip_space (str
);
961 reg2
= avr_operand (opcode
, where
, op
, &str
);
964 if (reg1_present
&& reg2_present
)
965 reg2
= (reg2
& 0xf) | ((reg2
<< 5) & 0x200);
966 else if (reg2_present
)
974 /* Detect undefined combinations (like ld r31,Z+). */
975 if (!avr_opt
.all_opcodes
&& AVR_UNDEF_P (bin
))
976 as_warn (_("undefined combination of operands"));
978 if (opcode
->insn_size
== 2)
980 /* Warn if the previous opcode was cpse/sbic/sbis/sbrc/sbrs
981 (AVR core bug, fixed in the newer devices). */
982 if (!(avr_opt
.no_skip_bug
||
983 (avr_mcu
->isa
& (AVR_ISA_MUL
| AVR_ISA_MOVW
)))
984 && AVR_SKIP_P (prev
))
985 as_warn (_("skipping two-word instruction"));
987 bfd_putl32 ((bfd_vma
) bin
, frag
);
990 bfd_putl16 ((bfd_vma
) bin
, frag
);
997 /* GAS will call this function for each section at the end of the assembly,
998 to permit the CPU backend to adjust the alignment of a section. */
1001 md_section_align (asection
*seg
, valueT addr
)
1003 int align
= bfd_get_section_alignment (stdoutput
, seg
);
1004 return ((addr
+ (1 << align
) - 1) & (-1 << align
));
1007 /* If you define this macro, it should return the offset between the
1008 address of a PC relative fixup and the position from which the PC
1009 relative adjustment should be made. On many processors, the base
1010 of a PC relative instruction is the next instruction, so this
1011 macro would return the length of an instruction. */
1014 md_pcrel_from_section (fixS
*fixp
, segT sec
)
1016 if (fixp
->fx_addsy
!= (symbolS
*) NULL
1017 && (!S_IS_DEFINED (fixp
->fx_addsy
)
1018 || (S_GET_SEGMENT (fixp
->fx_addsy
) != sec
)))
1021 return fixp
->fx_frag
->fr_address
+ fixp
->fx_where
;
1024 /* GAS will call this for each fixup. It should store the correct
1025 value in the object file. */
1028 md_apply_fix (fixS
*fixP
, valueT
* valP
, segT seg
)
1030 unsigned char *where
;
1034 if (fixP
->fx_addsy
== (symbolS
*) NULL
)
1037 else if (fixP
->fx_pcrel
)
1039 segT s
= S_GET_SEGMENT (fixP
->fx_addsy
);
1041 if (s
== seg
|| s
== absolute_section
)
1043 value
+= S_GET_VALUE (fixP
->fx_addsy
);
1048 /* We don't actually support subtracting a symbol. */
1049 if (fixP
->fx_subsy
!= (symbolS
*) NULL
)
1050 as_bad_where (fixP
->fx_file
, fixP
->fx_line
, _("expression too complex"));
1052 switch (fixP
->fx_r_type
)
1055 fixP
->fx_no_overflow
= 1;
1057 case BFD_RELOC_AVR_7_PCREL
:
1058 case BFD_RELOC_AVR_13_PCREL
:
1061 case BFD_RELOC_AVR_CALL
:
1067 /* Fetch the instruction, insert the fully resolved operand
1068 value, and stuff the instruction back again. */
1069 where
= (unsigned char *) fixP
->fx_frag
->fr_literal
+ fixP
->fx_where
;
1070 insn
= bfd_getl16 (where
);
1072 switch (fixP
->fx_r_type
)
1074 case BFD_RELOC_AVR_7_PCREL
:
1076 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1077 _("odd address operand: %ld"), value
);
1079 /* Instruction addresses are always right-shifted by 1. */
1081 --value
; /* Correct PC. */
1083 if (value
< -64 || value
> 63)
1084 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1085 _("operand out of range: %ld"), value
);
1086 value
= (value
<< 3) & 0x3f8;
1087 bfd_putl16 ((bfd_vma
) (value
| insn
), where
);
1090 case BFD_RELOC_AVR_13_PCREL
:
1092 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1093 _("odd address operand: %ld"), value
);
1095 /* Instruction addresses are always right-shifted by 1. */
1097 --value
; /* Correct PC. */
1099 if (value
< -2048 || value
> 2047)
1101 /* No wrap for devices with >8K of program memory. */
1102 if ((avr_mcu
->isa
& AVR_ISA_MEGA
) || avr_opt
.no_wrap
)
1103 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1104 _("operand out of range: %ld"), value
);
1108 bfd_putl16 ((bfd_vma
) (value
| insn
), where
);
1112 bfd_putl16 ((bfd_vma
) value
, where
);
1116 bfd_putl16 ((bfd_vma
) value
, where
);
1119 case BFD_RELOC_AVR_16_PM
:
1120 bfd_putl16 ((bfd_vma
) (value
>> 1), where
);
1123 case BFD_RELOC_AVR_LDI
:
1125 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1126 _("operand out of range: %ld"), value
);
1127 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
), where
);
1130 case BFD_RELOC_AVR_6
:
1131 if ((value
> 63) || (value
< 0))
1132 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1133 _("operand out of range: %ld"), value
);
1134 bfd_putl16 ((bfd_vma
) insn
| ((value
& 7) | ((value
& (3 << 3)) << 7) | ((value
& (1 << 5)) << 8)), where
);
1137 case BFD_RELOC_AVR_6_ADIW
:
1138 if ((value
> 63) || (value
< 0))
1139 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1140 _("operand out of range: %ld"), value
);
1141 bfd_putl16 ((bfd_vma
) insn
| (value
& 0xf) | ((value
& 0x30) << 2), where
);
1144 case BFD_RELOC_AVR_LO8_LDI
:
1145 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
), where
);
1148 case BFD_RELOC_AVR_HI8_LDI
:
1149 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 8), where
);
1152 case BFD_RELOC_AVR_MS8_LDI
:
1153 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 24), where
);
1156 case BFD_RELOC_AVR_HH8_LDI
:
1157 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 16), where
);
1160 case BFD_RELOC_AVR_LO8_LDI_NEG
:
1161 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
), where
);
1164 case BFD_RELOC_AVR_HI8_LDI_NEG
:
1165 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 8), where
);
1168 case BFD_RELOC_AVR_MS8_LDI_NEG
:
1169 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 24), where
);
1172 case BFD_RELOC_AVR_HH8_LDI_NEG
:
1173 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 16), where
);
1176 case BFD_RELOC_AVR_LO8_LDI_PM
:
1177 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 1), where
);
1180 case BFD_RELOC_AVR_HI8_LDI_PM
:
1181 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 9), where
);
1184 case BFD_RELOC_AVR_HH8_LDI_PM
:
1185 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 17), where
);
1188 case BFD_RELOC_AVR_LO8_LDI_PM_NEG
:
1189 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 1), where
);
1192 case BFD_RELOC_AVR_HI8_LDI_PM_NEG
:
1193 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 9), where
);
1196 case BFD_RELOC_AVR_HH8_LDI_PM_NEG
:
1197 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 17), where
);
1200 case BFD_RELOC_AVR_CALL
:
1204 x
= bfd_getl16 (where
);
1206 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1207 _("odd address operand: %ld"), value
);
1209 x
|= ((value
& 0x10000) | ((value
<< 3) & 0x1f00000)) >> 16;
1210 bfd_putl16 ((bfd_vma
) x
, where
);
1211 bfd_putl16 ((bfd_vma
) (value
& 0xffff), where
+ 2);
1216 as_fatal (_("line %d: unknown relocation type: 0x%x"),
1217 fixP
->fx_line
, fixP
->fx_r_type
);
1223 switch (fixP
->fx_r_type
)
1225 case -BFD_RELOC_AVR_HI8_LDI_NEG
:
1226 case -BFD_RELOC_AVR_HI8_LDI
:
1227 case -BFD_RELOC_AVR_LO8_LDI_NEG
:
1228 case -BFD_RELOC_AVR_LO8_LDI
:
1229 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1230 _("only constant expression allowed"));
1239 /* GAS will call this to generate a reloc, passing the resulting reloc
1240 to `bfd_install_relocation'. This currently works poorly, as
1241 `bfd_install_relocation' often does the wrong thing, and instances of
1242 `tc_gen_reloc' have been written to work around the problems, which
1243 in turns makes it difficult to fix `bfd_install_relocation'. */
1245 /* If while processing a fixup, a reloc really needs to be created
1246 then it is done here. */
1249 tc_gen_reloc (asection
*seg ATTRIBUTE_UNUSED
,
1254 if (fixp
->fx_addsy
&& fixp
->fx_subsy
)
1258 if ((S_GET_SEGMENT (fixp
->fx_addsy
) != S_GET_SEGMENT (fixp
->fx_subsy
))
1259 || S_GET_SEGMENT (fixp
->fx_addsy
) == undefined_section
)
1261 as_bad_where (fixp
->fx_file
, fixp
->fx_line
,
1262 "Difference of symbols in different sections is not supported");
1266 /* We are dealing with two symbols defined in the same section.
1267 Let us fix-up them here. */
1268 value
+= S_GET_VALUE (fixp
->fx_addsy
);
1269 value
-= S_GET_VALUE (fixp
->fx_subsy
);
1271 /* When fx_addsy and fx_subsy both are zero, md_apply_fix
1272 only takes it's second operands for the fixup value. */
1273 fixp
->fx_addsy
= NULL
;
1274 fixp
->fx_subsy
= NULL
;
1275 md_apply_fix (fixp
, (valueT
*) &value
, NULL
);
1280 reloc
= xmalloc (sizeof (arelent
));
1282 reloc
->sym_ptr_ptr
= xmalloc (sizeof (asymbol
*));
1283 *reloc
->sym_ptr_ptr
= symbol_get_bfdsym (fixp
->fx_addsy
);
1285 reloc
->address
= fixp
->fx_frag
->fr_address
+ fixp
->fx_where
;
1286 reloc
->howto
= bfd_reloc_type_lookup (stdoutput
, fixp
->fx_r_type
);
1287 if (reloc
->howto
== (reloc_howto_type
*) NULL
)
1289 as_bad_where (fixp
->fx_file
, fixp
->fx_line
,
1290 _("reloc %d not supported by object file format"),
1291 (int) fixp
->fx_r_type
);
1295 if (fixp
->fx_r_type
== BFD_RELOC_VTABLE_INHERIT
1296 || fixp
->fx_r_type
== BFD_RELOC_VTABLE_ENTRY
)
1297 reloc
->address
= fixp
->fx_offset
;
1299 reloc
->addend
= fixp
->fx_offset
;
1305 md_assemble (char *str
)
1307 struct avr_opcodes_s
*opcode
;
1310 str
= skip_space (extract_word (str
, op
, sizeof (op
)));
1313 as_bad (_("can't find opcode "));
1315 opcode
= (struct avr_opcodes_s
*) hash_find (avr_hash
, op
);
1319 as_bad (_("unknown opcode `%s'"), op
);
1323 /* Special case for opcodes with optional operands (lpm, elpm) -
1324 version with operands exists in avr_opcodes[] in the next entry. */
1326 if (*str
&& *opcode
->constraints
== '?')
1329 if (!avr_opt
.all_opcodes
&& (opcode
->isa
& avr_mcu
->isa
) != opcode
->isa
)
1330 as_bad (_("illegal opcode %s for mcu %s"), opcode
->name
, avr_mcu
->name
);
1332 /* We used to set input_line_pointer to the result of get_operands,
1333 but that is wrong. Our caller assumes we don't change it. */
1335 char *t
= input_line_pointer
;
1337 avr_operands (opcode
, &str
);
1338 if (*skip_space (str
))
1339 as_bad (_("garbage at end of line"));
1340 input_line_pointer
= t
;
1344 /* Flag to pass `pm' mode between `avr_parse_cons_expression' and
1345 `avr_cons_fix_new'. */
1346 static int exp_mod_pm
= 0;
1348 /* Parse special CONS expression: pm (expression)
1349 or alternatively: gs (expression).
1350 These are used for addressing program memory.
1351 Relocation: BFD_RELOC_AVR_16_PM. */
1354 avr_parse_cons_expression (expressionS
*exp
, int nbytes
)
1360 tmp
= input_line_pointer
= skip_space (input_line_pointer
);
1364 char *pm_name1
= "pm";
1365 char *pm_name2
= "gs";
1366 int len
= strlen (pm_name1
);
1367 /* len must be the same for both pm identifiers. */
1369 if (strncasecmp (input_line_pointer
, pm_name1
, len
) == 0
1370 || strncasecmp (input_line_pointer
, pm_name2
, len
) == 0)
1372 input_line_pointer
= skip_space (input_line_pointer
+ len
);
1374 if (*input_line_pointer
== '(')
1376 input_line_pointer
= skip_space (input_line_pointer
+ 1);
1380 if (*input_line_pointer
== ')')
1381 ++input_line_pointer
;
1384 as_bad (_("`)' required"));
1391 input_line_pointer
= tmp
;
1399 avr_cons_fix_new (fragS
*frag
,
1404 if (exp_mod_pm
== 0)
1407 fix_new_exp (frag
, where
, nbytes
, exp
, FALSE
, BFD_RELOC_16
);
1408 else if (nbytes
== 4)
1409 fix_new_exp (frag
, where
, nbytes
, exp
, FALSE
, BFD_RELOC_32
);
1411 as_bad (_("illegal %srelocation size: %d"), "", nbytes
);
1416 fix_new_exp (frag
, where
, nbytes
, exp
, FALSE
, BFD_RELOC_AVR_16_PM
);
1418 as_bad (_("illegal %srelocation size: %d"), "`pm' ", nbytes
);