1 /* tc-w65.c -- Assemble code for the W65816
2 Copyright 1995, 1998, 2000, 2001, 2002 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to the Free
18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
28 #include "../opcodes/w65-opc.h"
30 const char comment_chars[] = "!";
31 const char line_separator_chars[] = ";";
32 const char line_comment_chars[] = "!#";
34 /* This table describes all the machine specific pseudo-ops the assembler
35 has to support. The fields are:
37 pseudo-op name without dot
38 function to call to execute this pseudo-op
39 Integer arg to pass to the function */
52 static void s_longa PARAMS ((int));
53 static char *parse_exp PARAMS ((char *));
54 static char *get_operands PARAMS ((const struct opinfo *, char *));
55 static const struct opinfo *get_specific PARAMS ((const struct opinfo *));
56 static void build_Mytes PARAMS ((const struct opinfo *));
59 const pseudo_typeS md_pseudo_table[] = {
62 {"longa", s_longa, 0},
63 {"longi", s_longa, 1},
71 const char EXP_CHARS[] = "eE";
73 /* Chars that mean this number is a floating point constant. */
76 const char FLT_CHARS[] = "rRsSfFdDxXpP";
78 /* Opcode mnemonics */
79 static struct hash_control *opcode_hash_control;
84 #define C(a,b) ENCODE_RELAX(a,b)
85 #define ENCODE_RELAX(what,length) (((what) << 2) + (length))
87 #define GET_WHAT(x) ((x>>2))
91 #define UNDEF_BYTE_DISP 0
92 #define UNDEF_WORD_DISP 3
95 #define UNCOND_BRANCH 2
98 #define BYTE_F 127 /* How far we can branch forwards */
99 #define BYTE_B -126 /* How far we can branch backwards */
103 relax_typeS md_relax_table[C (END, 0)] = {
110 { 0, 0, 0, 0 }, /* UNDEF_BYTE_DISP */
111 { BYTE_F, BYTE_B, 2, C (COND_BRANCH, WORD_DISP) }, /* BYTE_DISP */
112 { WORD_F, WORD_B, 5, 0 }, /* WORD_DISP */
113 { 0, 0, 5, 0 }, /* UNDEF_WORD_DISP */
116 { 0, 0, 0, 0 }, /* UNDEF_BYTE_DISP */
117 { BYTE_F, BYTE_B, 2, C (UNCOND_BRANCH, WORD_DISP) }, /* BYTE_DISP */
118 { WORD_F, WORD_B, 3, 0 }, /* WORD_DISP */
119 { 0, 0, 3, 0 } /* UNDEF_WORD_DISP */
123 /* This function is called once, at assembler startup time. This
124 should set up all the tables, etc that the MD part of the assembler
131 int *p = xmode ? &X : &M;
132 while (*input_line_pointer == ' ')
133 input_line_pointer++;
134 if (strncmp (input_line_pointer, "on", 2) == 0)
136 input_line_pointer += 2;
139 else if (strncmp (input_line_pointer, "off", 3) == 0)
142 input_line_pointer += 3;
145 as_bad (_("need on or off."));
146 demand_empty_rest_of_line ();
152 const struct opinfo *opcode;
153 char *prev_name = "";
155 opcode_hash_control = hash_new ();
157 /* Insert unique names into hash table. */
158 for (opcode = optable; opcode->name; opcode++)
160 if (strcmp (prev_name, opcode->name))
162 prev_name = opcode->name;
163 hash_insert (opcode_hash_control, opcode->name, (char *) opcode);
167 flag_signed_overflow_ok = 1;
170 static expressionS immediate; /* absolute expression */
171 static expressionS immediate1; /* absolute expression */
177 w65_expression (dest)
183 while (*input_line_pointer == ' ')
184 input_line_pointer++;
186 if (*input_line_pointer == '<')
189 input_line_pointer++;
191 else if (*input_line_pointer == '>')
194 input_line_pointer++;
196 else if (*input_line_pointer == '^')
199 input_line_pointer++;
214 save = input_line_pointer;
215 input_line_pointer = s;
216 w65_expression (&immediate);
217 if (immediate.X_op == O_absent)
218 as_bad (_("missing operand"));
219 new = input_line_pointer;
220 input_line_pointer = save;
225 get_operands (info, ptr)
226 const struct opinfo *info;
229 register int override_len = 0;
230 register int bytes = 0;
260 ptr = parse_exp (ptr);
262 else if (ptr[0] == '!')
264 ptr = parse_exp (ptr + 1);
269 amode = ADDR_ABS_IDX_Y;
273 else if (ptr[1] == 'x')
275 amode = ADDR_ABS_IDX_X;
281 as_bad (_("syntax error after <exp"));
290 else if (ptr[0] == '>')
292 ptr = parse_exp (ptr + 1);
293 if (ptr[0] == ',' && ptr[1] == 'x')
295 amode = ADDR_ABS_LONG_IDX_X;
301 amode = ADDR_ABS_LONG;
305 else if (ptr[0] == '<')
307 ptr = parse_exp (ptr + 1);
312 amode = ADDR_DIR_IDX_Y;
316 else if (ptr[1] == 'x')
318 amode = ADDR_DIR_IDX_X;
324 as_bad (_("syntax error after <exp"));
333 else if (ptr[0] == 'a')
337 else if (ptr[0] == '(')
358 else if (ptr[0] == '!')
363 else if (ptr[0] == '>')
372 ptr = parse_exp (ptr);
377 if (ptr[0] == 'x' && ptr[1] == ')')
381 if (override_len == 1)
383 amode = ADDR_DIR_IDX_IND_X;
388 amode = ADDR_ABS_IND_IDX;
392 else if (ptr[0] == 's' && ptr[1] == ')'
393 && ptr[2] == ',' && ptr[3] == 'y')
395 amode = ADDR_STACK_REL_INDX_IDX;
400 else if (ptr[0] == ')')
402 if (ptr[1] == ',' && ptr[2] == 'y')
404 amode = ADDR_DIR_IND_IDX_Y;
410 if (override_len == 1)
412 amode = ADDR_DIR_IND;
417 amode = ADDR_ABS_IND;
425 else if (ptr[0] == '[')
427 ptr = parse_exp (ptr + 1);
431 if (ptr[0] == ',' && ptr[1] == 'y')
434 amode = ADDR_DIR_IND_IDX_Y_LONG;
439 if (info->code == O_jmp)
442 amode = ADDR_ABS_IND_LONG;
447 amode = ADDR_DIR_IND_LONG;
454 ptr = parse_exp (ptr);
459 if (override_len == 1)
462 amode = ADDR_DIR_IDX_Y;
466 amode = ADDR_ABS_IDX_Y;
471 else if (ptr[1] == 'x')
473 if (override_len == 1)
475 amode = ADDR_DIR_IDX_X;
480 amode = ADDR_ABS_IDX_X;
485 else if (ptr[1] == 's')
488 amode = ADDR_STACK_REL;
494 immediate1 = immediate;
495 ptr = parse_exp (ptr + 1);
496 amode = ADDR_BLOCK_MOVE;
507 case ADDR_PC_REL_LONG:
508 amode = ADDR_PC_REL_LONG;
512 if (override_len == 1)
517 else if (override_len == 3)
520 amode = ADDR_ABS_LONG;
537 if (amode == ADDR_DIR)
538 tc_cons_reloc = R_W65_DP;
540 tc_cons_reloc = R_W65_ABS8;
543 tc_cons_reloc = R_W65_ABS8S8;
546 tc_cons_reloc = R_W65_ABS8S16;
554 tc_cons_reloc = R_W65_ABS16;
557 tc_cons_reloc = R_W65_ABS16S8;
560 tc_cons_reloc = R_W65_ABS16S16;
567 /* Passed a pointer to a list of opcodes which use different
568 addressing modes, return the opcode which matches the opcodes
571 static const struct opinfo *
572 get_specific (opcode)
573 const struct opinfo *opcode;
575 int ocode = opcode->code;
577 for (; opcode->code == ocode; opcode++)
579 if (opcode->amode == amode)
585 /* Now we know what sort of opcodes it is, let's build the bytes. */
589 const struct opinfo *opcode;
596 if (opcode->amode == ADDR_IMPLIED)
598 output = frag_more (1);
600 else if (opcode->amode == ADDR_PC_REL)
604 /* This is a relaxable insn, so we do some special handling. */
605 type = opcode->val == OP_BRA ? UNCOND_BRANCH : COND_BRANCH;
606 output = frag_var (rs_machine_dependent,
607 md_relax_table[C (type, WORD_DISP)].rlx_length,
608 md_relax_table[C (type, BYTE_DISP)].rlx_length,
609 C (type, UNDEF_BYTE_DISP),
610 immediate.X_add_symbol,
611 immediate.X_add_number,
616 switch (opcode->amode)
618 GETINFO (size, type, pcrel);
623 /* If something special was done in the expression modify the
626 type = tc_cons_reloc;
628 /* 1 byte for the opcode + the bytes for the addrmode. */
629 output = frag_more (size + 1);
631 if (opcode->amode == ADDR_BLOCK_MOVE)
633 /* Two relocs for this one. */
634 fix_new_exp (frag_now,
635 output + 1 - frag_now->fr_literal,
641 fix_new_exp (frag_now,
642 output + 2 - frag_now->fr_literal,
649 && opcode->amode != ADDR_IMPLIED
650 && opcode->amode != ADDR_ACC
651 && opcode->amode != ADDR_STACK)
653 fix_new_exp (frag_now,
654 output + 1 - frag_now->fr_literal,
661 output[0] = opcode->val;
664 /* This is the guts of the machine-dependent assembler. STR points to
665 a machine dependent instruction. This function is supposed to emit
666 the frags/bytes it assembles to. */
672 const struct opinfo *opcode;
675 /* Drop leading whitespace */
679 /* all opcodes are three letters */
687 opcode = (struct opinfo *) hash_find (opcode_hash_control, name);
691 as_bad (_("unknown opcode"));
695 if (opcode->amode != ADDR_IMPLIED
696 && opcode->amode != ADDR_STACK)
698 get_operands (opcode, str);
699 opcode = get_specific (opcode);
704 /* Couldn't find an opcode which matched the operands. */
706 char *where = frag_more (1);
710 as_bad (_("invalid operands for opcode"));
714 build_Mytes (opcode);
718 md_undefined_symbol (name)
719 char *name ATTRIBUTE_UNUSED;
724 /* Various routines to kill one day. */
725 /* Equal to MAX_PRECISION in atof-ieee.c. */
726 #define MAX_LITTLENUMS 6
728 /* Turn a string in input_line_pointer into a floating point constant
729 of type TYPE, and store the appropriate bytes in *LITP. The number
730 of LITTLENUMS emitted is stored in *SIZEP. An error message is
731 returned, or NULL on OK. */
734 md_atof (type, litP, sizeP)
740 LITTLENUM_TYPE words[MAX_LITTLENUMS];
741 LITTLENUM_TYPE *wordP;
772 return _("Bad call to MD_NTOF()");
774 t = atof_ieee (input_line_pointer, type, words);
776 input_line_pointer = t;
778 *sizeP = prec * sizeof (LITTLENUM_TYPE);
779 for (wordP = words + prec - 1; prec--;)
781 md_number_to_chars (litP, (valueT) (*wordP--), sizeof (LITTLENUM_TYPE));
782 litP += sizeof (LITTLENUM_TYPE);
788 md_parse_option (c, a)
789 int c ATTRIBUTE_UNUSED;
790 char *a ATTRIBUTE_UNUSED;
795 /* Called after relaxing, change the frags so they know how big they
799 md_convert_frag (headers, seg, fragP)
800 object_headers *headers ATTRIBUTE_UNUSED;
801 segT seg ATTRIBUTE_UNUSED;
806 unsigned char *buffer =
807 (unsigned char *) (fragP->fr_fix + fragP->fr_literal);
809 switch (fragP->fr_subtype)
811 case C (COND_BRANCH, BYTE_DISP):
812 case C (UNCOND_BRANCH, BYTE_DISP):
817 /* Conditional branches to a known 16 bit displacement. */
818 case C (COND_BRANCH, WORD_DISP):
829 /* Invert the sense of the test */
831 buffer[1] = 3; /* Jump over following brl */
842 case C (UNCOND_BRANCH, WORD_DISP):
843 /* Unconditional branches to a known 16 bit displacement. */
856 /* Got to create a branch over a reloc here. */
857 case C (COND_BRANCH, UNDEF_WORD_DISP):
858 buffer[0] ^= 0x20; /* invert test */
871 fragP->fr_fix += disp_size + inst_size;
874 case C (UNCOND_BRANCH, UNDEF_WORD_DISP):
886 fragP->fr_fix += disp_size + inst_size;
894 /* Get the address of the end of the instruction. */
895 int next_inst = (fragP->fr_fix + fragP->fr_address
896 + disp_size + inst_size);
897 int targ_addr = (S_GET_VALUE (fragP->fr_symbol) +
899 int disp = targ_addr - next_inst;
901 md_number_to_chars (buffer + inst_size, disp, disp_size);
902 fragP->fr_fix += disp_size + inst_size;
908 md_section_align (seg, size)
912 return ((size + (1 << section_alignment[(int) seg]) - 1)
913 & (-1 << section_alignment[(int) seg]));
917 md_apply_fix3 (fixP, valP, seg)
920 segT seg ATTRIBUTE_UNUSED;
922 long val = * (long *) valP;
923 char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
924 int addr = fixP->fx_frag->fr_address + fixP->fx_where;
926 if (fixP->fx_r_type == 0)
928 if (fixP->fx_size == 1)
929 fixP->fx_r_type = R_W65_ABS8;
931 fixP->fx_r_type = R_W65_ABS16;
934 switch (fixP->fx_r_type)
957 *buf++ = val - addr - 1;
960 val = val - addr - 1;
972 if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0)
976 /* Put number into target byte order. */
979 md_number_to_chars (ptr, use, nbytes)
984 number_to_chars_littleendian (ptr, use, nbytes);
991 int gap = fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address - 1;
996 tc_coff_symbol_emit_hook (x)
997 symbolS *x ATTRIBUTE_UNUSED;
1002 tc_coff_fix2rtype (fix_ptr)
1005 return fix_ptr->fx_r_type;
1009 tc_reloc_mangle (fix_ptr, intr, base)
1011 struct internal_reloc *intr;
1015 symbolS *symbol_ptr;
1017 symbol_ptr = fix_ptr->fx_addsy;
1019 /* If this relocation is attached to a symbol then it's ok
1021 if (fix_ptr->fx_r_type == RELOC_32)
1023 /* cons likes to create reloc32's whatever the size of the reloc..
1025 switch (fix_ptr->fx_size)
1028 intr->r_type = R_IMM16;
1031 intr->r_type = R_IMM8;
1039 if (fix_ptr->fx_size == 4)
1040 intr->r_type = R_W65_ABS24;
1042 intr->r_type = fix_ptr->fx_r_type;
1045 intr->r_vaddr = fix_ptr->fx_frag->fr_address + fix_ptr->fx_where + base;
1046 intr->r_offset = fix_ptr->fx_offset;
1048 /* Turn the segment of the symbol into an offset. */
1053 dot = segment_info[S_GET_SEGMENT (symbol_ptr)].dot;
1056 intr->r_offset += S_GET_VALUE (symbol_ptr);
1057 intr->r_symndx = dot->sy_number;
1061 intr->r_symndx = symbol_ptr->sy_number;
1066 intr->r_symndx = -1;
1071 tc_coff_sizemachdep (frag)
1074 return md_relax_table[frag->fr_subtype].rlx_length;
1077 /* Called just before address relaxation, return the length by which a
1078 fragment must grow to reach it's destination. */
1081 md_estimate_size_before_relax (fragP, segment_type)
1082 register fragS *fragP;
1083 register segT segment_type;
1087 switch (fragP->fr_subtype)
1092 case C (COND_BRANCH, UNDEF_BYTE_DISP):
1093 case C (UNCOND_BRANCH, UNDEF_BYTE_DISP):
1094 what = GET_WHAT (fragP->fr_subtype);
1095 /* Used to be a branch to somewhere which was unknown. */
1096 if (S_GET_SEGMENT (fragP->fr_symbol) == segment_type)
1098 /* Got a symbol and it's defined in this segment, become byte
1099 sized - maybe it will fix up. */
1100 fragP->fr_subtype = C (what, BYTE_DISP);
1104 /* Its got a segment, but its not ours, so it will always be
1106 fragP->fr_subtype = C (what, UNDEF_WORD_DISP);
1110 case C (COND_BRANCH, BYTE_DISP):
1111 case C (COND_BRANCH, WORD_DISP):
1112 case C (COND_BRANCH, UNDEF_WORD_DISP):
1113 case C (UNCOND_BRANCH, BYTE_DISP):
1114 case C (UNCOND_BRANCH, WORD_DISP):
1115 case C (UNCOND_BRANCH, UNDEF_WORD_DISP):
1116 /* When relaxing a section for the second time, we don't need to
1117 do anything besides return the current size. */
1121 fragP->fr_var = md_relax_table[fragP->fr_subtype].rlx_length;
1122 return fragP->fr_var;
1125 const char *md_shortopts = "";
1126 struct option md_longopts[] = {
1127 #define OPTION_RELAX (OPTION_MD_BASE)
1128 {NULL, no_argument, NULL, 0}
1132 md_show_usage (stream)
1133 FILE *stream ATTRIBUTE_UNUSED;
1137 size_t md_longopts_size = sizeof (md_longopts);