1 /* tc-avr.c -- Assembler code for the ATMEL AVR
3 Copyright 1999, 2000, 2001, 2002, 2004, 2005
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 {"at90s1200", AVR_ISA_1200
, bfd_mach_avr1
},
72 {"attiny10", AVR_ISA_TINY1
, bfd_mach_avr1
}, /* XXX -> tn11 */
73 {"attiny11", AVR_ISA_TINY1
, bfd_mach_avr1
},
74 {"attiny12", AVR_ISA_TINY1
, bfd_mach_avr1
},
75 {"attiny15", AVR_ISA_TINY1
, bfd_mach_avr1
},
76 {"attiny28", AVR_ISA_TINY1
, bfd_mach_avr1
},
77 {"at90s2313", AVR_ISA_2xxx
, bfd_mach_avr2
},
78 {"at90s2323", AVR_ISA_2xxx
, bfd_mach_avr2
},
79 {"at90s2333", AVR_ISA_2xxx
, bfd_mach_avr2
}, /* XXX -> 4433 */
80 {"at90s2343", AVR_ISA_2xxx
, bfd_mach_avr2
},
81 {"attiny22", AVR_ISA_2xxx
, bfd_mach_avr2
}, /* XXX -> 2343 */
82 {"attiny26", AVR_ISA_2xxx
, bfd_mach_avr2
},
83 {"at90s4433", AVR_ISA_2xxx
, bfd_mach_avr2
},
84 {"at90s4414", AVR_ISA_2xxx
, bfd_mach_avr2
}, /* XXX -> 8515 */
85 {"at90s4434", AVR_ISA_2xxx
, bfd_mach_avr2
}, /* XXX -> 8535 */
86 {"at90s8515", AVR_ISA_2xxx
, bfd_mach_avr2
},
87 {"at90s8535", AVR_ISA_2xxx
, bfd_mach_avr2
},
88 {"at90c8534", AVR_ISA_2xxx
, bfd_mach_avr2
},
89 {"at86rf401", AVR_ISA_2xxx
, bfd_mach_avr2
},
90 {"attiny13", AVR_ISA_TINY2
, bfd_mach_avr2
},
91 {"attiny2313",AVR_ISA_TINY2
, bfd_mach_avr2
},
92 {"atmega603", AVR_ISA_M603
, bfd_mach_avr3
}, /* XXX -> m103 */
93 {"atmega103", AVR_ISA_M103
, bfd_mach_avr3
},
94 {"at43usb320",AVR_ISA_M103
, bfd_mach_avr3
},
95 {"at43usb355",AVR_ISA_M603
, bfd_mach_avr3
},
96 {"at76c711", AVR_ISA_M603
, bfd_mach_avr3
},
97 {"atmega48", AVR_ISA_M8
, bfd_mach_avr4
},
98 {"atmega8", AVR_ISA_M8
, bfd_mach_avr4
},
99 {"atmega83", AVR_ISA_M8
, bfd_mach_avr4
}, /* XXX -> m8535 */
100 {"atmega85", AVR_ISA_M8
, bfd_mach_avr4
}, /* XXX -> m8 */
101 {"atmega88", AVR_ISA_M8
, bfd_mach_avr4
},
102 {"atmega8515",AVR_ISA_M8
, bfd_mach_avr4
},
103 {"atmega8535",AVR_ISA_M8
, bfd_mach_avr4
},
104 {"atmega16", AVR_ISA_M323
, bfd_mach_avr5
},
105 {"atmega161", AVR_ISA_M161
, bfd_mach_avr5
},
106 {"atmega162", AVR_ISA_M323
, bfd_mach_avr5
},
107 {"atmega163", AVR_ISA_M161
, bfd_mach_avr5
},
108 {"atmega165", AVR_ISA_M323
, bfd_mach_avr5
},
109 {"atmega168", AVR_ISA_M323
, bfd_mach_avr5
},
110 {"atmega169", AVR_ISA_M323
, bfd_mach_avr5
},
111 {"atmega32", AVR_ISA_M323
, bfd_mach_avr5
},
112 {"atmega323", AVR_ISA_M323
, bfd_mach_avr5
},
113 {"atmega325", AVR_ISA_M323
, bfd_mach_avr5
},
114 {"atmega3250",AVR_ISA_M323
, bfd_mach_avr5
},
115 {"atmega64", AVR_ISA_M323
, bfd_mach_avr5
},
116 {"atmega128", AVR_ISA_M128
, bfd_mach_avr5
},
117 {"atmega645", AVR_ISA_M323
, bfd_mach_avr5
},
118 {"atmega6450",AVR_ISA_M323
, bfd_mach_avr5
},
119 {"at90can128",AVR_ISA_M128
, bfd_mach_avr5
},
120 {"at94k", AVR_ISA_94K
, bfd_mach_avr5
},
124 /* Current MCU type. */
125 static struct mcu_type_s default_mcu
= {"avr2", AVR_ISA_2xxx
,bfd_mach_avr2
};
126 static struct mcu_type_s
* avr_mcu
= & default_mcu
;
128 /* AVR target-specific switches. */
131 int all_opcodes
; /* -mall-opcodes: accept all known AVR opcodes. */
132 int no_skip_bug
; /* -mno-skip-bug: no warnings for skipping 2-word insns. */
133 int no_wrap
; /* -mno-wrap: reject rjmp/rcall with 8K wrap-around. */
136 static struct avr_opt_s avr_opt
= { 0, 0, 0 };
138 const char EXP_CHARS
[] = "eE";
139 const char FLT_CHARS
[] = "dD";
141 static void avr_set_arch (int);
143 /* The target specific pseudo-ops which we support. */
144 const pseudo_typeS md_pseudo_table
[] =
146 {"arch", avr_set_arch
, 0},
150 #define LDI_IMMEDIATE(x) (((x) & 0xf) | (((x) << 4) & 0xf00))
152 #define EXP_MOD_NAME(i) exp_mod[i].name
153 #define EXP_MOD_RELOC(i) exp_mod[i].reloc
154 #define EXP_MOD_NEG_RELOC(i) exp_mod[i].neg_reloc
155 #define HAVE_PM_P(i) exp_mod[i].have_pm
160 bfd_reloc_code_real_type reloc
;
161 bfd_reloc_code_real_type neg_reloc
;
165 static struct exp_mod_s exp_mod
[] =
167 {"hh8", BFD_RELOC_AVR_HH8_LDI
, BFD_RELOC_AVR_HH8_LDI_NEG
, 1},
168 {"pm_hh8", BFD_RELOC_AVR_HH8_LDI_PM
, BFD_RELOC_AVR_HH8_LDI_PM_NEG
, 0},
169 {"hi8", BFD_RELOC_AVR_HI8_LDI
, BFD_RELOC_AVR_HI8_LDI_NEG
, 1},
170 {"pm_hi8", BFD_RELOC_AVR_HI8_LDI_PM
, BFD_RELOC_AVR_HI8_LDI_PM_NEG
, 0},
171 {"lo8", BFD_RELOC_AVR_LO8_LDI
, BFD_RELOC_AVR_LO8_LDI_NEG
, 1},
172 {"pm_lo8", BFD_RELOC_AVR_LO8_LDI_PM
, BFD_RELOC_AVR_LO8_LDI_PM_NEG
, 0},
173 {"hlo8", -BFD_RELOC_AVR_LO8_LDI
, -BFD_RELOC_AVR_LO8_LDI_NEG
, 0},
174 {"hhi8", -BFD_RELOC_AVR_HI8_LDI
, -BFD_RELOC_AVR_HI8_LDI_NEG
, 0},
177 /* Opcode hash table. */
178 static struct hash_control
*avr_hash
;
180 /* Reloc modifiers hash control (hh8,hi8,lo8,pm_xx). */
181 static struct hash_control
*avr_mod_hash
;
183 #define OPTION_MMCU 'm'
186 OPTION_ALL_OPCODES
= OPTION_MD_BASE
+ 1,
191 struct option md_longopts
[] =
193 { "mmcu", required_argument
, NULL
, OPTION_MMCU
},
194 { "mall-opcodes", no_argument
, NULL
, OPTION_ALL_OPCODES
},
195 { "mno-skip-bug", no_argument
, NULL
, OPTION_NO_SKIP_BUG
},
196 { "mno-wrap", no_argument
, NULL
, OPTION_NO_WRAP
},
197 { NULL
, no_argument
, NULL
, 0 }
200 size_t md_longopts_size
= sizeof (md_longopts
);
202 /* Display nicely formatted list of known MCU names. */
205 show_mcu_list (FILE *stream
)
209 fprintf (stream
, _("Known MCU names:"));
212 for (i
= 0; mcu_types
[i
].name
; i
++)
214 int len
= strlen (mcu_types
[i
].name
);
219 fprintf (stream
, " %s", mcu_types
[i
].name
);
222 fprintf (stream
, "\n %s", mcu_types
[i
].name
);
227 fprintf (stream
, "\n");
233 while (*s
== ' ' || *s
== '\t')
238 /* Extract one word from FROM and copy it to TO. */
241 extract_word (char *from
, char *to
, int limit
)
247 /* Drop leading whitespace. */
248 from
= skip_space (from
);
251 /* Find the op code end. */
252 for (op_start
= op_end
= from
; *op_end
!= 0 && is_part_of_name (*op_end
);)
254 to
[size
++] = *op_end
++;
255 if (size
+ 1 >= limit
)
264 md_estimate_size_before_relax (fragS
*fragp ATTRIBUTE_UNUSED
,
265 asection
*seg ATTRIBUTE_UNUSED
)
272 md_show_usage (FILE *stream
)
276 " -mmcu=[avr-name] select microcontroller variant\n"
277 " [avr-name] can be:\n"
278 " avr1 - AT90S1200, ATtiny1x, ATtiny28\n"
279 " avr2 - AT90S2xxx, AT90S4xxx, AT90S8xxx, ATtiny22\n"
280 " avr3 - ATmega103, ATmega603\n"
281 " avr4 - ATmega83, ATmega85\n"
282 " avr5 - ATmega161, ATmega163, ATmega32, AT94K\n"
283 " or immediate microcontroller name.\n"));
285 _(" -mall-opcodes accept all AVR opcodes, even if not supported by MCU\n"
286 " -mno-skip-bug disable warnings for skipping two-word instructions\n"
287 " (default for avr4, avr5)\n"
288 " -mno-wrap reject rjmp/rcall instructions with 8K wrap-around\n"
289 " (default for avr3, avr5)\n"));
290 show_mcu_list (stream
);
294 avr_set_arch (int dummy ATTRIBUTE_UNUSED
)
298 input_line_pointer
= extract_word (input_line_pointer
, str
, 20);
299 md_parse_option (OPTION_MMCU
, str
);
300 bfd_set_arch_mach (stdoutput
, TARGET_ARCH
, avr_mcu
->mach
);
304 md_parse_option (int c
, char *arg
)
311 char *s
= alloca (strlen (arg
) + 1);
318 *t
= TOLOWER (*arg1
++);
322 for (i
= 0; mcu_types
[i
].name
; ++i
)
323 if (strcmp (mcu_types
[i
].name
, s
) == 0)
326 if (!mcu_types
[i
].name
)
328 show_mcu_list (stderr
);
329 as_fatal (_("unknown MCU: %s\n"), arg
);
332 /* It is OK to redefine mcu type within the same avr[1-5] bfd machine
333 type - this for allows passing -mmcu=... via gcc ASM_SPEC as well
334 as .arch ... in the asm output at the same time. */
335 if (avr_mcu
== &default_mcu
|| avr_mcu
->mach
== mcu_types
[i
].mach
)
336 avr_mcu
= &mcu_types
[i
];
338 as_fatal (_("redefinition of mcu type `%s' to `%s'"),
339 avr_mcu
->name
, mcu_types
[i
].name
);
342 case OPTION_ALL_OPCODES
:
343 avr_opt
.all_opcodes
= 1;
345 case OPTION_NO_SKIP_BUG
:
346 avr_opt
.no_skip_bug
= 1;
357 md_undefined_symbol (char *name ATTRIBUTE_UNUSED
)
362 /* Turn a string in input_line_pointer into a floating point constant
363 of type TYPE, and store the appropriate bytes in *LITP. The number
364 of LITTLENUMS emitted is stored in *SIZEP. An error message is
365 returned, or NULL on OK. */
368 md_atof (int type
, char *litP
, int *sizeP
)
371 LITTLENUM_TYPE words
[4];
372 LITTLENUM_TYPE
*wordP
;
385 return _("bad call to md_atof");
388 t
= atof_ieee (input_line_pointer
, type
, words
);
390 input_line_pointer
= t
;
392 *sizeP
= prec
* sizeof (LITTLENUM_TYPE
);
394 /* This loop outputs the LITTLENUMs in REVERSE order. */
395 for (wordP
= words
+ prec
- 1; prec
--;)
397 md_number_to_chars (litP
, (valueT
) (*wordP
--), sizeof (LITTLENUM_TYPE
));
398 litP
+= sizeof (LITTLENUM_TYPE
);
405 md_convert_frag (bfd
*abfd ATTRIBUTE_UNUSED
,
406 asection
*sec ATTRIBUTE_UNUSED
,
407 fragS
*fragP ATTRIBUTE_UNUSED
)
416 struct avr_opcodes_s
*opcode
;
418 avr_hash
= hash_new ();
420 /* Insert unique names into hash table. This hash table then provides a
421 quick index to the first opcode with a particular name in the opcode
423 for (opcode
= avr_opcodes
; opcode
->name
; opcode
++)
424 hash_insert (avr_hash
, opcode
->name
, (char *) opcode
);
426 avr_mod_hash
= hash_new ();
428 for (i
= 0; i
< ARRAY_SIZE (exp_mod
); ++i
)
429 hash_insert (avr_mod_hash
, EXP_MOD_NAME (i
), (void *) (i
+ 10));
431 bfd_set_arch_mach (stdoutput
, TARGET_ARCH
, avr_mcu
->mach
);
434 /* Resolve STR as a constant expression and return the result.
435 If result greater than MAX then error. */
438 avr_get_constant (char *str
, int max
)
442 str
= skip_space (str
);
443 input_line_pointer
= str
;
446 if (ex
.X_op
!= O_constant
)
447 as_bad (_("constant value required"));
449 if (ex
.X_add_number
> max
|| ex
.X_add_number
< 0)
450 as_bad (_("number must be less than %d"), max
+ 1);
452 return ex
.X_add_number
;
455 /* Parse for ldd/std offset. */
458 avr_offset_expression (expressionS
*exp
)
460 char *str
= input_line_pointer
;
465 str
= extract_word (str
, op
, sizeof (op
));
467 input_line_pointer
= tmp
;
470 /* Warn about expressions that fail to use lo8 (). */
471 if (exp
->X_op
== O_constant
)
473 int x
= exp
->X_add_number
;
475 if (x
< -255 || x
> 255)
476 as_warn (_("constant out of 8-bit range: %d"), x
);
480 /* Parse ordinary expression. */
483 parse_exp (char *s
, expressionS
*op
)
485 input_line_pointer
= s
;
487 if (op
->X_op
== O_absent
)
488 as_bad (_("missing operand"));
489 return input_line_pointer
;
492 /* Parse special expressions (needed for LDI command):
497 where xx is: hh, hi, lo. */
499 static bfd_reloc_code_real_type
500 avr_ldi_expression (expressionS
*exp
)
502 char *str
= input_line_pointer
;
508 str
= extract_word (str
, op
, sizeof (op
));
512 mod
= (int) hash_find (avr_mod_hash
, op
);
519 str
= skip_space (str
);
527 if (strncmp ("pm(", str
, 3) == 0
528 || strncmp ("-(pm(", str
, 5) == 0)
536 as_bad (_("illegal expression"));
548 if (*str
== '-' && *(str
+ 1) == '(')
555 input_line_pointer
= str
;
560 if (*input_line_pointer
!= ')')
562 as_bad (_("`)' required"));
565 input_line_pointer
++;
569 return neg_p
? EXP_MOD_NEG_RELOC (mod
) : EXP_MOD_RELOC (mod
);
574 input_line_pointer
= tmp
;
577 /* Warn about expressions that fail to use lo8 (). */
578 if (exp
->X_op
== O_constant
)
580 int x
= exp
->X_add_number
;
582 if (x
< -255 || x
> 255)
583 as_warn (_("constant out of 8-bit range: %d"), x
);
586 return BFD_RELOC_AVR_LDI
;
589 /* Parse one instruction operand.
590 Return operand bitmask. Also fixups can be generated. */
593 avr_operand (struct avr_opcodes_s
*opcode
,
599 unsigned int op_mask
= 0;
600 char *str
= skip_space (*line
);
604 /* Any register operand. */
610 if (*str
== 'r' || *str
== 'R')
614 str
= extract_word (str
, r_name
, sizeof (r_name
));
616 if (ISDIGIT (r_name
[1]))
618 if (r_name
[2] == '\0')
619 op_mask
= r_name
[1] - '0';
620 else if (r_name
[1] != '0'
621 && ISDIGIT (r_name
[2])
622 && r_name
[3] == '\0')
623 op_mask
= (r_name
[1] - '0') * 10 + r_name
[2] - '0';
628 op_mask
= avr_get_constant (str
, 31);
629 str
= input_line_pointer
;
637 if (op_mask
< 16 || op_mask
> 23)
638 as_bad (_("register r16-r23 required"));
644 as_bad (_("register number above 15 required"));
650 as_bad (_("even register number required"));
655 if ((op_mask
& 1) || op_mask
< 24)
656 as_bad (_("register r24, r26, r28 or r30 required"));
657 op_mask
= (op_mask
- 24) >> 1;
662 as_bad (_("register name or number from 0 to 31 required"));
671 str
= skip_space (str
+ 1);
680 as_bad (_("pointer register (X, Y or Z) required"));
682 str
= skip_space (str
+ 1);
687 as_bad (_("cannot both predecrement and postincrement"));
691 /* avr1 can do "ld r,Z" and "st Z,r" but no other pointer
692 registers, no predecrement, no postincrement. */
693 if (!avr_opt
.all_opcodes
&& (op_mask
& 0x100F)
694 && !(avr_mcu
->isa
& AVR_ISA_SRAM
))
695 as_bad (_("addressing mode not supported"));
701 as_bad (_("can't predecrement"));
703 if (! (*str
== 'z' || *str
== 'Z'))
704 as_bad (_("pointer register Z required"));
706 str
= skip_space (str
+ 1);
717 char c
= TOLOWER (*str
++);
722 as_bad (_("pointer register (Y or Z) required"));
723 str
= skip_space (str
);
726 input_line_pointer
= str
;
727 avr_offset_expression (& op_expr
);
728 str
= input_line_pointer
;
729 fix_new_exp (frag_now
, where
, 3,
730 &op_expr
, FALSE
, BFD_RELOC_AVR_6
);
736 str
= parse_exp (str
, &op_expr
);
737 fix_new_exp (frag_now
, where
, opcode
->insn_size
* 2,
738 &op_expr
, FALSE
, BFD_RELOC_AVR_CALL
);
742 str
= parse_exp (str
, &op_expr
);
743 fix_new_exp (frag_now
, where
, opcode
->insn_size
* 2,
744 &op_expr
, TRUE
, BFD_RELOC_AVR_13_PCREL
);
748 str
= parse_exp (str
, &op_expr
);
749 fix_new_exp (frag_now
, where
, opcode
->insn_size
* 2,
750 &op_expr
, TRUE
, BFD_RELOC_AVR_7_PCREL
);
754 str
= parse_exp (str
, &op_expr
);
755 fix_new_exp (frag_now
, where
+ 2, opcode
->insn_size
* 2,
756 &op_expr
, FALSE
, BFD_RELOC_16
);
761 bfd_reloc_code_real_type r_type
;
763 input_line_pointer
= str
;
764 r_type
= avr_ldi_expression (&op_expr
);
765 str
= input_line_pointer
;
766 fix_new_exp (frag_now
, where
, 3,
767 &op_expr
, FALSE
, r_type
);
775 x
= ~avr_get_constant (str
, 255);
776 str
= input_line_pointer
;
777 op_mask
|= (x
& 0xf) | ((x
<< 4) & 0xf00);
782 input_line_pointer
= str
;
783 avr_offset_expression (& op_expr
);
784 str
= input_line_pointer
;
785 fix_new_exp (frag_now
, where
, 3,
786 & op_expr
, FALSE
, BFD_RELOC_AVR_6_ADIW
);
794 x
= avr_get_constant (str
, 7);
795 str
= input_line_pointer
;
806 x
= avr_get_constant (str
, 63);
807 str
= input_line_pointer
;
808 op_mask
|= (x
& 0xf) | ((x
& 0x30) << 5);
816 x
= avr_get_constant (str
, 31);
817 str
= input_line_pointer
;
826 as_bad (_("unknown constraint `%c'"), *op
);
833 /* Parse instruction operands.
834 Return binary opcode. */
837 avr_operands (struct avr_opcodes_s
*opcode
, char **line
)
839 char *op
= opcode
->constraints
;
840 unsigned int bin
= opcode
->bin_opcode
;
841 char *frag
= frag_more (opcode
->insn_size
* 2);
843 int where
= frag
- frag_now
->fr_literal
;
844 static unsigned int prev
= 0; /* Previous opcode. */
846 /* Opcode have operands. */
849 unsigned int reg1
= 0;
850 unsigned int reg2
= 0;
851 int reg1_present
= 0;
852 int reg2_present
= 0;
854 /* Parse first operand. */
855 if (REGISTER_P (*op
))
857 reg1
= avr_operand (opcode
, where
, op
, &str
);
860 /* Parse second operand. */
873 if (REGISTER_P (*op
))
876 str
= skip_space (str
);
878 as_bad (_("`,' required"));
879 str
= skip_space (str
);
881 reg2
= avr_operand (opcode
, where
, op
, &str
);
884 if (reg1_present
&& reg2_present
)
885 reg2
= (reg2
& 0xf) | ((reg2
<< 5) & 0x200);
886 else if (reg2_present
)
894 /* Detect undefined combinations (like ld r31,Z+). */
895 if (!avr_opt
.all_opcodes
&& AVR_UNDEF_P (bin
))
896 as_warn (_("undefined combination of operands"));
898 if (opcode
->insn_size
== 2)
900 /* Warn if the previous opcode was cpse/sbic/sbis/sbrc/sbrs
901 (AVR core bug, fixed in the newer devices). */
902 if (!(avr_opt
.no_skip_bug
||
903 (avr_mcu
->isa
& (AVR_ISA_MUL
| AVR_ISA_MOVW
)))
904 && AVR_SKIP_P (prev
))
905 as_warn (_("skipping two-word instruction"));
907 bfd_putl32 ((bfd_vma
) bin
, frag
);
910 bfd_putl16 ((bfd_vma
) bin
, frag
);
917 /* GAS will call this function for each section at the end of the assembly,
918 to permit the CPU backend to adjust the alignment of a section. */
921 md_section_align (asection
*seg
, valueT addr
)
923 int align
= bfd_get_section_alignment (stdoutput
, seg
);
924 return ((addr
+ (1 << align
) - 1) & (-1 << align
));
927 /* If you define this macro, it should return the offset between the
928 address of a PC relative fixup and the position from which the PC
929 relative adjustment should be made. On many processors, the base
930 of a PC relative instruction is the next instruction, so this
931 macro would return the length of an instruction. */
934 md_pcrel_from_section (fixS
*fixp
, segT sec
)
936 if (fixp
->fx_addsy
!= (symbolS
*) NULL
937 && (!S_IS_DEFINED (fixp
->fx_addsy
)
938 || (S_GET_SEGMENT (fixp
->fx_addsy
) != sec
)))
941 return fixp
->fx_frag
->fr_address
+ fixp
->fx_where
;
944 /* GAS will call this for each fixup. It should store the correct
945 value in the object file. */
948 md_apply_fix (fixS
*fixP
, valueT
* valP
, segT seg
)
950 unsigned char *where
;
954 if (fixP
->fx_addsy
== (symbolS
*) NULL
)
957 else if (fixP
->fx_pcrel
)
959 segT s
= S_GET_SEGMENT (fixP
->fx_addsy
);
961 if (s
== seg
|| s
== absolute_section
)
963 value
+= S_GET_VALUE (fixP
->fx_addsy
);
968 /* We don't actually support subtracting a symbol. */
969 if (fixP
->fx_subsy
!= (symbolS
*) NULL
)
970 as_bad_where (fixP
->fx_file
, fixP
->fx_line
, _("expression too complex"));
972 switch (fixP
->fx_r_type
)
975 fixP
->fx_no_overflow
= 1;
977 case BFD_RELOC_AVR_7_PCREL
:
978 case BFD_RELOC_AVR_13_PCREL
:
981 case BFD_RELOC_AVR_CALL
:
987 /* Fetch the instruction, insert the fully resolved operand
988 value, and stuff the instruction back again. */
989 where
= (unsigned char *) fixP
->fx_frag
->fr_literal
+ fixP
->fx_where
;
990 insn
= bfd_getl16 (where
);
992 switch (fixP
->fx_r_type
)
994 case BFD_RELOC_AVR_7_PCREL
:
996 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
997 _("odd address operand: %ld"), value
);
999 /* Instruction addresses are always right-shifted by 1. */
1001 --value
; /* Correct PC. */
1003 if (value
< -64 || value
> 63)
1004 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1005 _("operand out of range: %ld"), value
);
1006 value
= (value
<< 3) & 0x3f8;
1007 bfd_putl16 ((bfd_vma
) (value
| insn
), where
);
1010 case BFD_RELOC_AVR_13_PCREL
:
1012 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1013 _("odd address operand: %ld"), value
);
1015 /* Instruction addresses are always right-shifted by 1. */
1017 --value
; /* Correct PC. */
1019 if (value
< -2048 || value
> 2047)
1021 /* No wrap for devices with >8K of program memory. */
1022 if ((avr_mcu
->isa
& AVR_ISA_MEGA
) || avr_opt
.no_wrap
)
1023 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1024 _("operand out of range: %ld"), value
);
1028 bfd_putl16 ((bfd_vma
) (value
| insn
), where
);
1032 bfd_putl16 ((bfd_vma
) value
, where
);
1036 bfd_putl16 ((bfd_vma
) value
, where
);
1039 case BFD_RELOC_AVR_16_PM
:
1040 bfd_putl16 ((bfd_vma
) (value
>> 1), where
);
1043 case BFD_RELOC_AVR_LDI
:
1045 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1046 _("operand out of range: %ld"), value
);
1047 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
), where
);
1050 case BFD_RELOC_AVR_6
:
1051 if ((value
> 63) || (value
< 0))
1052 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1053 _("operand out of range: %ld"), value
);
1054 bfd_putl16 ((bfd_vma
) insn
| ((value
& 7) | ((value
& (3 << 3)) << 7) | ((value
& (1 << 5)) << 8)), where
);
1057 case BFD_RELOC_AVR_6_ADIW
:
1058 if ((value
> 63) || (value
< 0))
1059 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1060 _("operand out of range: %ld"), value
);
1061 bfd_putl16 ((bfd_vma
) insn
| (value
& 0xf) | ((value
& 0x30) << 2), where
);
1064 case BFD_RELOC_AVR_LO8_LDI
:
1065 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
), where
);
1068 case -BFD_RELOC_AVR_LO8_LDI
:
1069 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 16), where
);
1072 case BFD_RELOC_AVR_HI8_LDI
:
1073 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 8), where
);
1076 case -BFD_RELOC_AVR_HI8_LDI
:
1077 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 24), where
);
1080 case BFD_RELOC_AVR_HH8_LDI
:
1081 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 16), where
);
1084 case BFD_RELOC_AVR_LO8_LDI_NEG
:
1085 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
), where
);
1088 case -BFD_RELOC_AVR_LO8_LDI_NEG
:
1089 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 16), where
);
1092 case BFD_RELOC_AVR_HI8_LDI_NEG
:
1093 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 8), where
);
1096 case -BFD_RELOC_AVR_HI8_LDI_NEG
:
1097 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 24), where
);
1100 case BFD_RELOC_AVR_HH8_LDI_NEG
:
1101 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 16), where
);
1104 case BFD_RELOC_AVR_LO8_LDI_PM
:
1105 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 1), where
);
1108 case BFD_RELOC_AVR_HI8_LDI_PM
:
1109 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 9), where
);
1112 case BFD_RELOC_AVR_HH8_LDI_PM
:
1113 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (value
>> 17), where
);
1116 case BFD_RELOC_AVR_LO8_LDI_PM_NEG
:
1117 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 1), where
);
1120 case BFD_RELOC_AVR_HI8_LDI_PM_NEG
:
1121 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 9), where
);
1124 case BFD_RELOC_AVR_HH8_LDI_PM_NEG
:
1125 bfd_putl16 ((bfd_vma
) insn
| LDI_IMMEDIATE (-value
>> 17), where
);
1128 case BFD_RELOC_AVR_CALL
:
1132 x
= bfd_getl16 (where
);
1134 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1135 _("odd address operand: %ld"), value
);
1137 x
|= ((value
& 0x10000) | ((value
<< 3) & 0x1f00000)) >> 16;
1138 bfd_putl16 ((bfd_vma
) x
, where
);
1139 bfd_putl16 ((bfd_vma
) (value
& 0xffff), where
+ 2);
1144 as_fatal (_("line %d: unknown relocation type: 0x%x"),
1145 fixP
->fx_line
, fixP
->fx_r_type
);
1151 switch (fixP
->fx_r_type
)
1153 case -BFD_RELOC_AVR_HI8_LDI_NEG
:
1154 case -BFD_RELOC_AVR_HI8_LDI
:
1155 case -BFD_RELOC_AVR_LO8_LDI_NEG
:
1156 case -BFD_RELOC_AVR_LO8_LDI
:
1157 as_bad_where (fixP
->fx_file
, fixP
->fx_line
,
1158 _("only constant expression allowed"));
1167 /* GAS will call this to generate a reloc, passing the resulting reloc
1168 to `bfd_install_relocation'. This currently works poorly, as
1169 `bfd_install_relocation' often does the wrong thing, and instances of
1170 `tc_gen_reloc' have been written to work around the problems, which
1171 in turns makes it difficult to fix `bfd_install_relocation'. */
1173 /* If while processing a fixup, a reloc really needs to be created
1174 then it is done here. */
1177 tc_gen_reloc (asection
*seg ATTRIBUTE_UNUSED
,
1182 reloc
= xmalloc (sizeof (arelent
));
1184 reloc
->sym_ptr_ptr
= xmalloc (sizeof (asymbol
*));
1185 *reloc
->sym_ptr_ptr
= symbol_get_bfdsym (fixp
->fx_addsy
);
1187 reloc
->address
= fixp
->fx_frag
->fr_address
+ fixp
->fx_where
;
1188 reloc
->howto
= bfd_reloc_type_lookup (stdoutput
, fixp
->fx_r_type
);
1189 if (reloc
->howto
== (reloc_howto_type
*) NULL
)
1191 as_bad_where (fixp
->fx_file
, fixp
->fx_line
,
1192 _("reloc %d not supported by object file format"),
1193 (int) fixp
->fx_r_type
);
1197 if (fixp
->fx_r_type
== BFD_RELOC_VTABLE_INHERIT
1198 || fixp
->fx_r_type
== BFD_RELOC_VTABLE_ENTRY
)
1199 reloc
->address
= fixp
->fx_offset
;
1201 reloc
->addend
= fixp
->fx_offset
;
1207 md_assemble (char *str
)
1209 struct avr_opcodes_s
*opcode
;
1212 str
= skip_space (extract_word (str
, op
, sizeof (op
)));
1215 as_bad (_("can't find opcode "));
1217 opcode
= (struct avr_opcodes_s
*) hash_find (avr_hash
, op
);
1221 as_bad (_("unknown opcode `%s'"), op
);
1225 /* Special case for opcodes with optional operands (lpm, elpm) -
1226 version with operands exists in avr_opcodes[] in the next entry. */
1228 if (*str
&& *opcode
->constraints
== '?')
1231 if (!avr_opt
.all_opcodes
&& (opcode
->isa
& avr_mcu
->isa
) != opcode
->isa
)
1232 as_bad (_("illegal opcode %s for mcu %s"), opcode
->name
, avr_mcu
->name
);
1234 /* We used to set input_line_pointer to the result of get_operands,
1235 but that is wrong. Our caller assumes we don't change it. */
1237 char *t
= input_line_pointer
;
1239 avr_operands (opcode
, &str
);
1240 if (*skip_space (str
))
1241 as_bad (_("garbage at end of line"));
1242 input_line_pointer
= t
;
1246 /* Flag to pass `pm' mode between `avr_parse_cons_expression' and
1247 `avr_cons_fix_new'. */
1248 static int exp_mod_pm
= 0;
1250 /* Parse special CONS expression: pm (expression)
1251 which is used for addressing to a program memory.
1252 Relocation: BFD_RELOC_AVR_16_PM. */
1255 avr_parse_cons_expression (expressionS
*exp
, int nbytes
)
1261 tmp
= input_line_pointer
= skip_space (input_line_pointer
);
1265 char *pm_name
= "pm";
1266 int len
= strlen (pm_name
);
1268 if (strncasecmp (input_line_pointer
, pm_name
, len
) == 0)
1270 input_line_pointer
= skip_space (input_line_pointer
+ len
);
1272 if (*input_line_pointer
== '(')
1274 input_line_pointer
= skip_space (input_line_pointer
+ 1);
1278 if (*input_line_pointer
== ')')
1279 ++input_line_pointer
;
1282 as_bad (_("`)' required"));
1289 input_line_pointer
= tmp
;
1297 avr_cons_fix_new (fragS
*frag
,
1302 if (exp_mod_pm
== 0)
1305 fix_new_exp (frag
, where
, nbytes
, exp
, FALSE
, BFD_RELOC_16
);
1306 else if (nbytes
== 4)
1307 fix_new_exp (frag
, where
, nbytes
, exp
, FALSE
, BFD_RELOC_32
);
1309 as_bad (_("illegal %srelocation size: %d"), "", nbytes
);
1314 fix_new_exp (frag
, where
, nbytes
, exp
, FALSE
, BFD_RELOC_AVR_16_PM
);
1316 as_bad (_("illegal %srelocation size: %d"), "`pm' ", nbytes
);