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);