1 /* tc-z8k.c -- Assemble code for the Zilog Z800N
2 Copyright (C) 1992 Free Software Foundation.
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
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 Written By Steve Chamberlain
27 #include "../opcodes/z8k-opc.h"
35 const char comment_chars[] =
37 const char line_separator_chars[] =
39 const char line_comment_chars[] = { '#', 0};
42 extern int coff_flags;
46 /* This table describes all the machine specific pseudo-ops the assembler
47 has to support. The fields are:
48 pseudo-op name without dot
49 function to call to execute this pseudo-op
50 Integer arg to pass to the function
59 machine = bfd_mach_z8001;
67 machine = bfd_mach_z8002;
75 record_alignment(now_seg,1);
77 void obj_coff_section();
82 if (isdigit(c)) return c - '0';
83 if (islower(c)) return c - 'a' + 10;
90 if (*input_line_pointer == '\'') {
93 c = *input_line_pointer++;
96 c = (tohex(input_line_pointer[0]) << 4)
97 | tohex(input_line_pointer[1]);
98 input_line_pointer+=2;
100 FRAG_APPEND_1_CHAR(c);
101 c = *input_line_pointer++;
103 demand_empty_rest_of_line();
107 const pseudo_typeS md_pseudo_table[] =
113 {"form", listing_psize, 0},
114 {"heading", listing_title, 0},
115 {"import", s_ignore, 0},
116 {"page", listing_eject, 0},
117 {"program", s_ignore, 0},
118 {"z8001", s_segm, 0},
119 {"z8002", s_unseg, 0},
123 {"unsegm", s_unseg, 0},
124 {"name", s_app_file, 0},
125 {"global",s_globl,0},
130 {"rsect",obj_coff_section,0},
131 {"sect",obj_coff_section,0},
137 const char EXP_CHARS[] = "eE";
139 /* Chars that mean this number is a floating point constant */
142 const char FLT_CHARS[] = "rRsSfFdDxXpP";
144 const relax_typeS md_relax_table[1];
146 static struct hash_control *opcode_hash_control; /* Opcode mnemonics */
151 opcode_entry_type *opcode;
152 char *prev_name = "";
155 opcode_hash_control = hash_new ();
157 for (opcode = z8k_table; opcode->name; opcode++)
159 /* Only enter unique codes into the table */
160 char *src = opcode->name;
162 if (strcmp (opcode->name, prev_name))
164 hash_insert (opcode_hash_control, opcode->name, (char *) opcode);
168 prev_name = opcode->name;
171 /* default to z8002 */
174 /* insert the pseudo ops too */
175 for (idx = 0; md_pseudo_table[idx].poc_name; idx++)
177 opcode_entry_type *fake_opcode;
178 fake_opcode = (opcode_entry_type*)malloc(sizeof(opcode_entry_type));
179 fake_opcode->name = md_pseudo_table[idx].poc_name,
180 fake_opcode->func = (void *)(md_pseudo_table+idx);
181 fake_opcode->opcode = 250;
183 hash_insert(opcode_hash_control,fake_opcode->name,fake_opcode);
194 typedef struct z8k_op
196 char regsize; /* 'b','w','r','q' */
197 unsigned int reg; /* 0..15 */
201 unsigned int x_reg; /* any other register associated with the mode */
202 expressionS exp; /* any expression */
207 static expressionS *da_operand;
208 static expressionS *imm_operand;
214 DEFUN (whatreg, (reg, src),
218 if (isdigit (src[1]))
220 *reg = (src[0] - '0') * 10 + src[1] - '0';
225 *reg = (src[0] - '0');
237 WREG r0,r1,r2,r3,r4,r5,r6,r7,fp,sp
246 /* try and parse a reg name, returns number of chars consumed */
248 DEFUN (parse_reg, (src, mode, reg),
255 if (src[0] == 's' && src[1]=='p') {
256 if (segmented_mode) {
257 *mode = CLASS_REG_LONG;
262 *mode = CLASS_REG_WORD;
271 *mode = CLASS_REG_LONG;
272 res = whatreg (reg, src + 2);
274 else if (src[1] == 'h' )
276 *mode = CLASS_REG_BYTE;
277 res = whatreg (reg, src + 2) ;
279 else if (src[1] == 'l' )
281 *mode = CLASS_REG_BYTE;
282 res = whatreg (reg, src + 2);
285 else if (src[1] == 'q')
287 *mode = CLASS_REG_QUAD;
288 res = whatreg (reg, src + 2);
292 *mode = CLASS_REG_WORD;
293 res = whatreg (reg, src + 1);
301 DEFUN (parse_exp, (s, op),
305 char *save = input_line_pointer;
309 input_line_pointer = s;
311 new = input_line_pointer;
312 input_line_pointer = save;
313 if (SEG_NORMAL (seg))
324 as_bad ("Missing operand");
327 as_bad ("Don't understand operand of type %s", segment_name (seg));
332 /* The many forms of operand:
351 DEFUN (checkfor, (ptr, what),
359 as_bad ("expected %c", what);
364 /* Make sure the mode supplied is the size of a word */
366 DEFUN (regword, (mode, string),
375 as_bad ("register is wrong size for a word %s", string);
379 /* Make sure the mode supplied is the size of an address */
381 DEFUN (regaddr, (mode, string),
387 ok = segmented_mode ? CLASS_REG_LONG : CLASS_REG_WORD;
390 as_bad ("register is wrong size for address %s", string);
401 struct cc_names table[] =
429 DEFUN (get_cc_operand, (ptr, mode, dst),
431 struct z8k_op *mode AND
441 mode->mode = CLASS_CC;
442 for (i = 0; table[i].name; i++)
446 for (j = 0; table[i].name[j]; j++)
448 if (table[i].name[j] != src[j])
451 the_cc = table[i].value;
461 DEFUN (get_operand, (ptr, mode, dst),
463 struct z8k_op *mode AND
478 mode->mode = CLASS_IMM;
479 imm_operand = &(mode->exp);
480 src = parse_exp (src + 1, &(mode->exp));
482 else if (*src == '@')
486 mode->mode = CLASS_IR;
487 src = parse_reg (src + 1, &d, &mode->reg);
493 end = parse_reg (src, &mode->mode, ®n);
503 end = parse_reg (src, &nw, &nr);
511 as_bad ("Missing ) in ra(rb)");
518 regaddr (mode->mode, "ra(rb) ra");
519 regword (mode->mode, "ra(rb) rb");
520 mode->mode = CLASS_BX;
530 src = parse_exp (src, &(mode->exp));
531 src = checkfor (src, ')');
532 mode->mode = CLASS_BA;
535 imm_operand = &(mode->exp);
547 src = parse_exp (src, &(mode->exp));
551 end = parse_reg (src, &(mode->mode), ®n);
552 regword (mode->mode, "addr(Ra) ra");
553 mode->mode = CLASS_X;
556 da_operand = &(mode->exp);
557 src = checkfor (end, ')');
561 /* Just an address */
562 mode->mode = CLASS_DA;
565 da_operand = &(mode->exp);
574 DEFUN (get_operands, (opcode, op_end, operand),
575 opcode_entry_type * opcode AND
581 switch (opcode->noperands)
590 if (opcode->arg_info[0] == CLASS_CC)
592 get_cc_operand (&ptr, operand + 0, 0);
597 get_operand (&ptr, operand + 0, 0);
604 if (opcode->arg_info[0] == CLASS_CC)
606 get_cc_operand (&ptr, operand + 0, 0);
611 get_operand (&ptr, operand + 0, 0);
617 get_operand (&ptr, operand + 1, 1);
622 get_operand (&ptr, operand + 0, 0);
625 get_operand (&ptr, operand + 1, 1);
628 get_operand (&ptr, operand + 2, 2);
633 get_operand (&ptr, operand + 0, 0);
636 get_operand (&ptr, operand + 1, 1);
639 get_operand (&ptr, operand + 2, 2);
642 get_cc_operand (&ptr, operand + 3, 3);
651 /* Passed a pointer to a list of opcodes which use different
652 addressing modes, return the opcode which matches the opcodes
658 DEFUN (get_specific, (opcode, operands),
659 opcode_entry_type * opcode AND
663 opcode_entry_type *this_try = opcode;
665 unsigned int noperands = opcode->noperands;
667 unsigned int dispreg;
668 unsigned int this_index = opcode->idx;
670 while (this_index == opcode->idx && !found)
675 for (i = 0; i < noperands; i++)
677 int mode = operands[i].mode;
679 if ((mode & CLASS_MASK) != (this_try->arg_info[i] & CLASS_MASK))
681 /* it could be an pc rel operand, if this is a da mode and
682 we like disps, then insert it */
684 if (mode == CLASS_DA && this_try->arg_info[i] == CLASS_DISP)
686 /* This is the case */
687 operands[i].mode = CLASS_DISP;
689 else if (mode == CLASS_BA && this_try->arg_info[i])
691 /* Can't think of a way to turn what we've been given into
692 something that's ok */
698 switch (mode & CLASS_MASK)
713 reg[this_try->arg_info[i] & ARG_MASK] = operands[i].reg;
728 DEFUN (check_operand, (operand, width, string),
729 struct z8k_op *operand AND
730 unsigned int width AND
733 if (operand->exp.X_add_symbol == 0
734 && operand->exp.X_subtract_symbol == 0)
737 /* No symbol involved, let's look at offset, it's dangerous if any of
738 the high bits are not 0 or ff's, find out by oring or anding with
739 the width and seeing if the answer is 0 or all fs*/
740 if ((operand->exp.X_add_number & ~width) != 0 &&
741 (operand->exp.X_add_number | width) != (~0))
743 as_warn ("operand %s0x%x out of range.", string, operand->exp.X_add_number);
749 static char buffer[20];
752 DEFUN (newfix, (ptr, type, operand),
755 expressionS * operand)
757 if (operand->X_add_symbol
758 || operand->X_subtract_symbol
759 || operand->X_add_number)
764 operand->X_add_symbol,
765 operand->X_subtract_symbol,
766 operand->X_add_number,
773 DEFUN (apply_fix, (ptr, type, operand, size),
776 expressionS * operand AND
779 int n = operand->X_add_number;
781 operand->X_add_number = n;
782 newfix ((ptr - buffer) / 2, type, operand);
786 case 8: /* 8 nibbles == 32 bits */
791 case 4: /* 4 niblles == 16 bits */
805 /* Now we know what sort of opcodes it is, lets build the bytes -
807 #define INSERT(x,y) *x++ = y>>24; *x++ = y>> 16; *x++=y>>8; *x++ =y;
809 DEFUN (build_bytes, (this_try, operand),
810 opcode_entry_type * this_try AND
811 struct z8k_op *operand)
817 char *output_ptr = buffer;
823 unsigned short *class_ptr;
825 frag_wane (frag_now);
828 memset (buffer, 20, 0);
829 class_ptr = this_try->byte_info;
832 for (nibble = 0; c = *class_ptr++; nibble++)
835 switch (c & CLASS_MASK)
841 /* Direct address, we don't cope with the SS mode right now */
844 da_operand->X_add_number |= 0x80000000;
845 output_ptr = apply_fix (output_ptr, R_IMM32, da_operand, 8);
849 output_ptr = apply_fix (output_ptr, R_IMM16, da_operand, 4);
855 output_ptr = apply_fix (output_ptr, R_JR, da_operand, 2);
860 *output_ptr = c & 0xf;
863 if (imm_operand->X_add_number==2)
867 else if (imm_operand->X_add_number != 1)
869 as_bad("immediate must be 1 or 2");
874 as_bad("immediate 1 or 2 expected");
879 *output_ptr++ = the_cc;
882 *output_ptr++ = c & 0xf;
885 if (reg[c & 0xf] == 0)
887 as_bad ("can't use R0 here");
894 /* Insert bit mattern of
896 *output_ptr++ = reg[c & 0xf];
899 output_ptr = apply_fix (output_ptr, R_IMM16, da_operand, 4);
906 switch (c & ARG_MASK)
909 output_ptr = apply_fix (output_ptr, R_IMM4L, imm_operand, 1);
912 imm_operand->X_add_number--;
913 output_ptr = apply_fix (output_ptr, R_IMM4L, imm_operand, 1);
916 imm_operand->X_add_number--;
917 output_ptr = apply_fix (output_ptr, R_IMM4L, imm_operand, 1);
920 imm_operand->X_add_number = -imm_operand->X_add_number;
922 output_ptr = apply_fix (output_ptr, R_IMM8, imm_operand, 2);
925 output_ptr = apply_fix (output_ptr, R_IMM16, imm_operand, 4);
929 output_ptr = apply_fix (output_ptr, R_IMM32, imm_operand, 8);
939 /* Copy from the nibble buffer into the frag */
942 int length = (output_ptr - buffer) / 2;
944 char *fragp = frag_more (length);
946 while (src < output_ptr)
948 *fragp = (src[0] << 4) | src[1];
957 /* This is the guts of the machine-dependent assembler. STR points to a
958 machine dependent instruction. This funciton is supposed to emit
959 the frags/bytes it assembles to.
963 DEFUN (md_assemble, (str),
969 struct z8k_op operand[3];
970 opcode_entry_type *opcode;
971 opcode_entry_type *prev_opcode;
976 /* Drop leading whitespace */
980 /* find the op code end */
981 for (op_start = op_end = str;
982 *op_end != 0 && *op_end != ' ';
989 if (op_end == op_start)
991 as_bad ("can't find opcode ");
997 opcode = (opcode_entry_type *) hash_find (opcode_hash_control,
1003 as_bad ("unknown opcode");
1007 if (opcode->opcode == 250)
1009 /* was really a pseudo op */
1014 char *old = input_line_pointer;
1018 input_line_pointer = op_end;
1022 while (*input_line_pointer == ' ')
1023 input_line_pointer++;
1024 p = (pseudo_typeS *)(opcode->func);
1026 (p->poc_handler)(p->poc_val);
1027 input_line_pointer = old;
1031 input_line_pointer = get_operands (opcode, op_end,
1034 prev_opcode = opcode;
1036 opcode = get_specific (opcode, operand);
1040 /* Couldn't find an opcode which matched the operands */
1041 char *where = frag_more (2);
1046 as_bad ("Can't find opcode to match operands");
1050 build_bytes (opcode, operand);
1055 DEFUN (tc_crawl_symbol_chain, (headers),
1056 object_headers * headers)
1058 printf ("call to tc_crawl_symbol_chain \n");
1062 DEFUN (md_undefined_symbol, (name),
1069 DEFUN (tc_headers_hook, (headers),
1070 object_headers * headers)
1072 printf ("call to tc_headers_hook \n");
1080 /* Various routines to kill one day */
1081 /* Equal to MAX_PRECISION in atof-ieee.c */
1082 #define MAX_LITTLENUMS 6
1084 /* Turn a string in input_line_pointer into a floating point constant of type
1085 type, and store the appropriate bytes in *litP. The number of LITTLENUMS
1086 emitted is stored in *sizeP . An error message is returned, or NULL on OK.
1089 md_atof (type, litP, sizeP)
1095 LITTLENUM_TYPE words[MAX_LITTLENUMS];
1096 LITTLENUM_TYPE *wordP;
1128 return "Bad call to MD_ATOF()";
1130 t = atof_ieee (input_line_pointer, type, words);
1132 input_line_pointer = t;
1134 *sizeP = prec * sizeof (LITTLENUM_TYPE);
1135 for (wordP = words; prec--;)
1137 md_number_to_chars (litP, (long) (*wordP++), sizeof (LITTLENUM_TYPE));
1138 litP += sizeof (LITTLENUM_TYPE);
1140 return ""; /* Someone should teach Dean about null pointers */
1144 md_parse_option (argP, cntP, vecP)
1150 if (!strcmp(*argP,"z8001")) {
1153 else if (!strcmp(*argP,"z8002")) {
1161 int md_short_jump_size;
1164 tc_aout_fix_to_chars ()
1166 printf ("call to tc_aout_fix_to_chars \n");
1171 md_create_short_jump (ptr, from_addr, to_addr, frag, to_symbol)
1178 as_fatal ("failed sanity check.");
1182 md_create_long_jump (ptr, from_addr, to_addr, frag, to_symbol)
1184 long from_addr, to_addr;
1188 as_fatal ("failed sanity check.");
1192 md_convert_frag (headers, fragP)
1193 object_headers *headers;
1197 printf ("call to md_convert_frag \n");
1202 DEFUN (md_section_align, (seg, size),
1206 return ((size + (1 << section_alignment[(int) seg]) - 1) & (-1 << section_alignment[(int) seg]));
1211 md_apply_fix (fixP, val)
1215 char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
1217 switch (fixP->fx_r_type)
1220 buf[0] = (buf[0] & 0xf0) | ((buf[0] + val) & 0xf);
1226 /* if (val != 0) abort();*/
1233 *buf++ = (val >> 8);
1237 *buf++ = (val >> 24);
1238 *buf++ = (val >> 16);
1239 *buf++ = (val >> 8);
1244 *buf++ = (val >> 16);
1246 *buf++ = (val >> 8);
1258 DEFUN (md_operand, (expressionP), expressionS * expressionP)
1262 int md_long_jump_size;
1264 md_estimate_size_before_relax (fragP, segment_type)
1265 register fragS *fragP;
1266 register segT segment_type;
1268 printf ("call tomd_estimate_size_before_relax \n");
1272 /* Put number into target byte order */
1275 DEFUN (md_number_to_chars, (ptr, use, nbytes),
1283 *ptr++ = (use >> 24) & 0xff;
1285 *ptr++ = (use >> 16) & 0xff;
1287 *ptr++ = (use >> 8) & 0xff;
1289 *ptr++ = (use >> 0) & 0xff;
1296 md_pcrel_from (fixP)
1303 tc_coff_symbol_emit_hook ()
1308 tc_reloc_mangle (fix_ptr, intr, base)
1310 struct internal_reloc *intr;
1314 symbolS *symbol_ptr;
1316 symbol_ptr = fix_ptr->fx_addsy;
1318 /* If this relocation is attached to a symbol then it's ok
1320 if (fix_ptr->fx_r_type == 0)
1322 /* cons likes to create reloc32's whatever the size of the reloc..
1324 switch (fix_ptr->fx_size)
1328 intr->r_type = R_IMM16;
1331 intr->r_type = R_IMM8;
1334 intr->r_type = R_IMM32;
1344 intr->r_type = fix_ptr->fx_r_type;
1347 intr->r_vaddr = fix_ptr->fx_frag->fr_address + fix_ptr->fx_where + base;
1348 intr->r_offset = fix_ptr->fx_offset;
1351 intr->r_symndx = symbol_ptr->sy_number;
1353 intr->r_symndx = -1;