1 /* tc-a29k.c -- Assemble for the AMD 29000.
2 Copyright (C) 1989, 1990, 1991, 1992 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
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
20 /* John Gilmore has reorganized this module somewhat, to make it easier
21 to convert it to new machines' assemblers as desired. There was too
22 much bloody rewriting required before. There still probably is. */
27 #include "opcode/a29k.h"
29 /* Make it easier to clone this machine desc into another one. */
30 #define machine_opcode a29k_opcode
31 #define machine_opcodes a29k_opcodes
32 #define machine_ip a29k_ip
33 #define machine_it a29k_it
35 const relax_typeS md_relax_table[] =
38 #define IMMEDIATE_BIT 0x01000000 /* Turns RB into Immediate */
39 #define ABSOLUTE_BIT 0x01000000 /* Turns PC-relative to Absolute */
40 #define CE_BIT 0x00800000 /* Coprocessor enable in LOAD */
41 #define UI_BIT 0x00000080 /* Unsigned integer in CONVERT */
43 /* handle of the OPCODE hash table */
44 static struct hash_control *op_hash = NULL;
53 int reloc_offset; /* Offset of reloc within insn */
64 /* static int getExpression(char *str); */
65 static void machine_ip (char *str);
66 /* static void print_insn(struct machine_it *insn); */
67 static void s_data1 (void);
68 static void s_use (void);
70 #else /* not __STDC__ */
72 /* static int getExpression(); */
73 static void machine_ip ();
74 /* static void print_insn(); */
75 static void s_data1 ();
78 #endif /* not __STDC__ */
83 {"align", s_align_bytes, 4},
84 {"block", s_space, 0},
85 {"cputype", s_ignore, 0}, /* CPU as 29000 or 29050 */
86 {"reg", s_lsym, 0}, /* Register equate, same as equ */
87 {"space", s_ignore, 0}, /* Listing control */
88 {"sect", s_ignore, 0}, /* Creation of coff sections */
90 /* We can do this right with coff */
97 int md_short_jump_size = 4;
98 int md_long_jump_size = 4;
99 #if defined(BFD_HEADERS)
101 const int md_reloc_size = RELSZ; /* Coff headers */
103 const int md_reloc_size = 12; /* something else headers */
106 const int md_reloc_size = 12; /* Not bfdized*/
109 /* This array holds the chars that always start a comment. If the
110 pre-processor is disabled, these aren't very useful */
111 const char comment_chars[] = ";";
113 /* This array holds the chars that only start a comment at the beginning of
114 a line. If the line seems to have the form '# 123 filename'
115 .line and .file directives will appear in the pre-processed output */
116 /* Note that input_file.c hand checks for '#' at the beginning of the
117 first line of the input file. This is because the compiler outputs
118 #NO_APP at the beginning of its output. */
119 /* Also note that comments like this one will always work */
120 const char line_comment_chars[] = "#";
122 /* We needed an unused char for line separation to work around the
123 lack of macros, using sed and such. */
124 const char line_separator_chars[] = "@";
126 /* Chars that can be used to separate mant from exp in floating point nums */
127 const char EXP_CHARS[] = "eE";
129 /* Chars that mean this number is a floating point constant */
132 const char FLT_CHARS[] = "rRsSfFdDxXpP";
134 /* Also be aware that MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT may have to be
135 changed in read.c . Ideally it shouldn't have to know about it at all,
136 but nothing is ideal around here.
139 static unsigned char octal[256];
140 #define isoctal(c) octal[c]
141 static unsigned char toHex[256];
144 * anull bit - causes the branch delay slot instructions to not be executed
146 #define ANNUL (1 << 29)
152 if (strncmp (input_line_pointer, ".text", 5) == 0)
154 input_line_pointer += 5;
158 if (strncmp (input_line_pointer, ".data", 5) == 0)
160 input_line_pointer += 5;
164 if (strncmp (input_line_pointer, ".data1", 6) == 0)
166 input_line_pointer += 6;
170 /* Literals can't go in the text segment because you can't read
171 from instruction memory on some 29k's. So, into initialized data. */
172 if (strncmp (input_line_pointer, ".lit", 4) == 0)
174 input_line_pointer += 4;
175 subseg_new (SEG_DATA, 200);
176 demand_empty_rest_of_line ();
180 as_bad ("Unknown segment type");
181 demand_empty_rest_of_line ();
188 subseg_new (SEG_DATA, 1);
189 demand_empty_rest_of_line ();
193 /* Install symbol definition that maps REGNAME to REGNO.
194 FIXME-SOON: These are not recognized in mixed case. */
197 insert_sreg (regname, regnum)
201 /* FIXME-SOON, put something in these syms so they won't be output to the symbol
202 table of the resulting object file. */
204 /* Must be large enough to hold the names of the special registers. */
208 symbol_table_insert (symbol_new (regname, SEG_REGISTER, regnum, &zero_address_frag));
209 for (i = 0; regname[i]; i++)
210 buf[i] = islower (regname[i]) ? toupper (regname[i]) : regname[i];
213 symbol_table_insert (symbol_new (buf, SEG_REGISTER, regnum, &zero_address_frag));
214 } /* insert_sreg() */
216 /* Install symbol definitions for assorted special registers.
217 See ASM29K Ref page 2-9. */
224 /* Protected special-purpose register names */
225 insert_sreg ("vab", SREG + 0);
226 insert_sreg ("ops", SREG + 1);
227 insert_sreg ("cps", SREG + 2);
228 insert_sreg ("cfg", SREG + 3);
229 insert_sreg ("cha", SREG + 4);
230 insert_sreg ("chd", SREG + 5);
231 insert_sreg ("chc", SREG + 6);
232 insert_sreg ("rbp", SREG + 7);
233 insert_sreg ("tmc", SREG + 8);
234 insert_sreg ("tmr", SREG + 9);
235 insert_sreg ("pc0", SREG + 10);
236 insert_sreg ("pc1", SREG + 11);
237 insert_sreg ("pc2", SREG + 12);
238 insert_sreg ("mmu", SREG + 13);
239 insert_sreg ("lru", SREG + 14);
241 /* Additional protected special-purpose registers for the 29050 */
242 insert_sreg ("rsn", SREG + 15);
243 insert_sreg ("rma0", SREG + 16);
244 insert_sreg ("rmc0", SREG + 17);
245 insert_sreg ("rma1", SREG + 18);
246 insert_sreg ("rmc1", SREG + 19);
247 insert_sreg ("spc0", SREG + 20);
248 insert_sreg ("spc1", SREG + 21);
249 insert_sreg ("spc2", SREG + 22);
250 insert_sreg ("iba0", SREG + 23);
251 insert_sreg ("ibc0", SREG + 24);
252 insert_sreg ("iba1", SREG + 25);
253 insert_sreg ("ibc1", SREG + 26);
255 /* Unprotected special-purpose register names */
256 insert_sreg ("ipc", SREG + 128);
257 insert_sreg ("ipa", SREG + 129);
258 insert_sreg ("ipb", SREG + 130);
259 insert_sreg ("q", SREG + 131);
260 insert_sreg ("alu", SREG + 132);
261 insert_sreg ("bp", SREG + 133);
262 insert_sreg ("fc", SREG + 134);
263 insert_sreg ("cr", SREG + 135);
264 insert_sreg ("fpe", SREG + 160);
265 insert_sreg ("inte", SREG + 161);
266 insert_sreg ("fps", SREG + 162);
267 /* "", SREG+163); Reserved */
268 insert_sreg ("exop", SREG + 164);
269 } /* define_some_regs() */
271 /* This function is called once, at assembler startup time. It should
272 set up all the tables, etc. that the MD part of the assembler will need. */
276 register char *retval = NULL;
278 register int skipnext = 0;
279 register unsigned int i;
280 register char *strend, *strend2;
282 /* Hash up all the opcodes for fast use later. */
284 op_hash = hash_new ();
286 for (i = 0; i < num_opcodes; i++)
288 const char *name = machine_opcodes[i].name;
296 /* Hack to avoid multiple opcode entries. We pre-locate all the
297 variations (b/i field and P/A field) and handle them. */
299 if (!strcmp (name, machine_opcodes[i + 1].name))
301 if ((machine_opcodes[i].opcode ^ machine_opcodes[i + 1].opcode)
304 strend = machine_opcodes[i].args + strlen (machine_opcodes[i].args) - 1;
305 strend2 = machine_opcodes[i + 1].args + strlen (machine_opcodes[i + 1].args) - 1;
326 fprintf (stderr, "internal error: can't handle opcode %s\n", name);
330 /* OK, this is an i/b or A/P pair. We skip the higher-valued one,
331 and let the code for operand checking handle OR-ing in the bit. */
332 if (machine_opcodes[i].opcode & 1)
338 retval = hash_insert (op_hash, name, &machine_opcodes[i]);
339 if (retval != NULL && *retval != '\0')
341 fprintf (stderr, "internal error: can't hash `%s': %s\n",
342 machine_opcodes[i].name, retval);
348 as_fatal ("Broken assembler. No assembly attempted.");
350 for (i = '0'; i < '8'; ++i)
352 for (i = '0'; i <= '9'; ++i)
354 for (i = 'a'; i <= 'f'; ++i)
355 toHex[i] = i + 10 - 'a';
356 for (i = 'A'; i <= 'F'; ++i)
357 toHex[i] = i + 10 - 'A';
368 /* Assemble a single instruction. Its label has already been handled
369 by the generic front end. We just parse opcode and operands, and
370 produce the bytes of data and relocation. */
382 /* put out the opcode */
383 md_number_to_chars (toP, the_insn.opcode, 4);
385 /* put out the symbol-dependent stuff */
386 if (the_insn.reloc != NO_RELOC)
389 frag_now, /* which frag */
390 (toP - frag_now->fr_literal + the_insn.reloc_offset), /* where */
392 the_insn.exp.X_add_symbol,
393 the_insn.exp.X_subtract_symbol,
394 the_insn.exp.X_add_number,
402 parse_operand (s, operandp)
404 expressionS *operandp;
406 char *save = input_line_pointer;
410 input_line_pointer = s;
411 seg = expr (0, operandp);
412 new = input_line_pointer;
413 input_line_pointer = save;
415 if (seg == SEG_ABSENT)
416 as_bad ("Missing operand");
420 /* Instruction parsing. Takes a string containing the opcode.
421 Operands are at input_line_pointer. Output is in the_insn.
422 Warnings or errors are generated. */
431 /* !!!! unsigned long i; */
432 struct machine_opcode *insn;
434 unsigned long opcode;
435 /* !!!! unsigned int mask; */
436 expressionS the_operand;
437 expressionS *operand = &the_operand;
440 /* Must handle `div0' opcode. */
443 for (; isalnum (*s); ++s)
452 case ' ': /* FIXME-SOMEDAY more whitespace */
457 as_bad ("Unknown opcode: `%s'", str);
460 if ((insn = (struct machine_opcode *) hash_find (op_hash, str)) == NULL)
462 as_bad ("Unknown opcode `%s'.", str);
466 opcode = insn->opcode;
467 memset (&the_insn, '\0', sizeof (the_insn));
468 the_insn.reloc = NO_RELOC;
471 * Build the opcode, checking as we go to make
472 * sure that the operands match.
474 * If an operand matches, we modify the_insn or opcode appropriately,
475 * and do a "continue". If an operand fails to match, we "break".
477 if (insn->args[0] != '\0')
478 s = parse_operand (s, operand); /* Prime the pump */
480 for (args = insn->args;; ++args)
485 case '\0': /* end of args */
488 /* We are truly done. */
489 the_insn.opcode = opcode;
492 as_bad ("Too many operands: %s", s);
495 case ',': /* Must match a comma */
498 s = parse_operand (s, operand); /* Parse next opnd */
503 case 'v': /* Trap numbers (immediate field) */
504 if (operand->X_seg == SEG_ABSOLUTE)
506 if (operand->X_add_number < 256)
508 opcode |= (operand->X_add_number << 16);
513 as_bad ("Immediate value of %d is too large",
514 operand->X_add_number);
518 the_insn.reloc = RELOC_8;
519 the_insn.reloc_offset = 1; /* BIG-ENDIAN Byte 1 of insn */
520 the_insn.exp = *operand;
523 case 'b': /* A general register or 8-bit immediate */
525 /* We treat the two cases identically since we mashed
526 them together in the opcode table. */
527 if (operand->X_seg == SEG_REGISTER)
530 opcode |= IMMEDIATE_BIT;
531 if (operand->X_seg == SEG_ABSOLUTE)
533 if (operand->X_add_number < 256)
535 opcode |= operand->X_add_number;
540 as_bad ("Immediate value of %d is too large",
541 operand->X_add_number);
545 the_insn.reloc = RELOC_8;
546 the_insn.reloc_offset = 3; /* BIG-ENDIAN Byte 3 of insn */
547 the_insn.exp = *operand;
550 case 'a': /* next operand must be a register */
553 /* lrNNN or grNNN or %%expr or a user-def register name */
554 if (operand->X_seg != SEG_REGISTER)
555 break; /* Only registers */
556 know (operand->X_add_symbol == 0);
557 know (operand->X_subtract_symbol == 0);
558 reg = operand->X_add_number;
560 break; /* No special registers */
563 * Got the register, now figure out where
564 * it goes in the opcode.
581 as_fatal ("failed sanity check.");
584 case 'x': /* 16 bit constant, zero-extended */
585 case 'X': /* 16 bit constant, one-extended */
586 if (operand->X_seg == SEG_ABSOLUTE)
588 opcode |= (operand->X_add_number & 0xFF) << 0 |
589 ((operand->X_add_number & 0xFF00) << 8);
592 the_insn.reloc = RELOC_CONST;
593 the_insn.exp = *operand;
597 if (operand->X_seg == SEG_ABSOLUTE)
599 opcode |= (operand->X_add_number & 0x00FF0000) >> 16 |
600 (((unsigned long) operand->X_add_number
601 /* avoid sign ext */ & 0xFF000000) >> 8);
604 the_insn.reloc = RELOC_CONSTH;
605 the_insn.exp = *operand;
608 case 'P': /* PC-relative jump address */
609 case 'A': /* Absolute jump address */
610 /* These two are treated together since we folded the
611 opcode table entries together. */
612 if (operand->X_seg == SEG_ABSOLUTE)
614 opcode |= ABSOLUTE_BIT |
615 (operand->X_add_number & 0x0003FC00) << 6 |
616 ((operand->X_add_number & 0x000003FC) >> 2);
619 the_insn.reloc = RELOC_JUMPTARG;
620 the_insn.exp = *operand;
621 the_insn.pcrel = 1; /* Assume PC-relative jump */
622 /* FIXME-SOON, Do we figure out whether abs later, after know sym val? */
625 case 'e': /* Coprocessor enable bit for LOAD/STORE insn */
626 if (operand->X_seg == SEG_ABSOLUTE)
628 if (operand->X_add_number == 0)
630 if (operand->X_add_number == 1)
638 case 'n': /* Control bits for LOAD/STORE instructions */
639 if (operand->X_seg == SEG_ABSOLUTE &&
640 operand->X_add_number < 128)
642 opcode |= (operand->X_add_number << 16);
647 case 's': /* Special register number */
648 if (operand->X_seg != SEG_REGISTER)
649 break; /* Only registers */
650 if (operand->X_add_number < SREG)
651 break; /* Not a special register */
652 opcode |= (operand->X_add_number & 0xFF) << 8;
655 case 'u': /* UI bit of CONVERT */
656 if (operand->X_seg == SEG_ABSOLUTE)
658 if (operand->X_add_number == 0)
660 if (operand->X_add_number == 1)
668 case 'r': /* RND bits of CONVERT */
669 if (operand->X_seg == SEG_ABSOLUTE &&
670 operand->X_add_number < 8)
672 opcode |= operand->X_add_number << 4;
677 case 'd': /* FD bits of CONVERT */
678 if (operand->X_seg == SEG_ABSOLUTE &&
679 operand->X_add_number < 4)
681 opcode |= operand->X_add_number << 2;
687 case 'f': /* FS bits of CONVERT */
688 if (operand->X_seg == SEG_ABSOLUTE &&
689 operand->X_add_number < 4)
691 opcode |= operand->X_add_number << 0;
697 if (operand->X_seg == SEG_ABSOLUTE &&
698 operand->X_add_number < 4)
700 opcode |= operand->X_add_number << 16;
706 if (operand->X_seg == SEG_ABSOLUTE &&
707 operand->X_add_number < 16)
709 opcode |= operand->X_add_number << 18;
717 /* Types or values of args don't match. */
718 as_bad ("Invalid operands");
724 This is identical to the md_atof in m68k.c. I think this is right,
727 Turn a string in input_line_pointer into a floating point constant of type
728 type, and store the appropriate bytes in *litP. The number of LITTLENUMS
729 emitted is stored in *sizeP . An error message is returned, or NULL on OK.
732 /* Equal to MAX_PRECISION in atof-ieee.c */
733 #define MAX_LITTLENUMS 6
736 md_atof (type, litP, sizeP)
742 LITTLENUM_TYPE words[MAX_LITTLENUMS];
743 LITTLENUM_TYPE *wordP;
775 return "Bad call to MD_ATOF()";
777 t = atof_ieee (input_line_pointer, type, words);
779 input_line_pointer = t;
780 *sizeP = prec * sizeof (LITTLENUM_TYPE);
781 for (wordP = words; prec--;)
783 md_number_to_chars (litP, (long) (*wordP++), sizeof (LITTLENUM_TYPE));
784 litP += sizeof (LITTLENUM_TYPE);
786 return ""; /* Someone should teach Dean about null pointers */
790 * Write out big-endian.
793 md_number_to_chars (buf, val, n)
812 as_fatal ("failed sanity check.");
818 md_apply_fix (fixP, val)
822 char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
824 fixP->fx_addnumber = val; /* Remember value for emit_reloc */
827 know (fixP->fx_size == 4);
828 know (fixP->fx_r_type < NO_RELOC);
831 * This is a hack. There should be a better way to
834 if (fixP->fx_r_type == RELOC_WDISP30 && fixP->fx_addsy)
836 val += fixP->fx_where + fixP->fx_frag->fr_address;
839 switch (fixP->fx_r_type)
854 val = (val >>= 2) + 1;
855 buf[0] |= (val >> 24) & 0x3f;
856 buf[1] = (val >> 16);
862 buf[1] |= (val >> 26) & 0x3f;
868 buf[2] |= (val >> 8) & 0x03;
873 buf[2] |= (val >> 8) & 0x1f;
878 val = (val >>= 2) + 1;
881 buf[1] |= (val >> 16) & 0x3f;
895 case RELOC_JUMPTARG: /* 00XX00XX pattern in a word */
896 buf[1] = val >> 10; /* Holds bits 0003FFFC of address */
900 case RELOC_CONST: /* 00XX00XX pattern in a word */
901 buf[1] = val >> 8; /* Holds bits 0000XXXX */
905 case RELOC_CONSTH: /* 00XX00XX pattern in a word */
906 buf[1] = val >> 24; /* Holds bits XXXX0000 */
912 as_bad ("bad relocation type: 0x%02x", fixP->fx_r_type);
920 tc_coff_fix2rtype (fixP)
924 switch (fixP->fx_r_type)
937 printf ("need %o3\n", fixP->fx_r_type);
939 } /* switch on type */
942 } /* tc_coff_fix2rtype() */
944 #endif /* OBJ_COFF */
946 /* should never be called for sparc */
948 md_create_short_jump (ptr, from_addr, to_addr, frag, to_symbol)
950 addressT from_addr, to_addr;
954 as_fatal ("a29k_create_short_jmp\n");
957 /* should never be called for 29k */
959 md_convert_frag (headers, fragP)
960 object_headers *headers;
961 register fragS *fragP;
963 as_fatal ("sparc_convert_frag\n");
966 /* should never be called for 29k */
968 md_create_long_jump (ptr, from_addr, to_addr, frag, to_symbol)
975 as_fatal ("sparc_create_long_jump\n");
978 /* should never be called for a29k */
980 md_estimate_size_before_relax (fragP, segtype)
981 register fragS *fragP;
984 as_fatal ("sparc_estimate_size_before_relax\n");
989 /* for debugging only */
992 struct machine_it *insn;
1025 fprintf (stderr, "ERROR: %s\n");
1027 fprintf (stderr, "opcode=0x%08x\n", insn->opcode);
1028 fprintf (stderr, "reloc = %s\n", Reloc[insn->reloc]);
1029 fprintf (stderr, "exp = {\n");
1030 fprintf (stderr, "\t\tX_add_symbol = %s\n",
1031 insn->exp.X_add_symbol ?
1032 (S_GET_NAME (insn->exp.X_add_symbol) ?
1033 S_GET_NAME (insn->exp.X_add_symbol) : "???") : "0");
1034 fprintf (stderr, "\t\tX_sub_symbol = %s\n",
1035 insn->exp.X_subtract_symbol ?
1036 (S_GET_NAME (insn->exp.X_subtract_symbol) ?
1037 S_GET_NAME (insn->exp.X_subtract_symbol) : "???") : "0");
1038 fprintf (stderr, "\t\tX_add_number = %d\n",
1039 insn->exp.X_add_number);
1040 fprintf (stderr, "}\n");
1046 /* Translate internal representation of relocation info to target format.
1048 On sparc/29k: first 4 bytes are normal unsigned long address, next three
1049 bytes are index, most sig. byte first. Byte 7 is broken up with
1050 bit 7 as external, bits 6 & 5 unused, and the lower
1051 five bits as relocation type. Next 4 bytes are long addend. */
1052 /* Thanx and a tip of the hat to Michael Bloom, mb@ttidca.tti.com */
1057 tc_aout_fix_to_chars (where, fixP, segment_address_in_file)
1060 relax_addressT segment_address_in_file;
1064 know (fixP->fx_r_type < NO_RELOC);
1065 know (fixP->fx_addsy != NULL);
1067 md_number_to_chars (where,
1068 fixP->fx_frag->fr_address + fixP->fx_where - segment_address_in_file,
1071 r_symbolnum = (S_IS_DEFINED (fixP->fx_addsy)
1072 ? S_GET_TYPE (fixP->fx_addsy)
1073 : fixP->fx_addsy->sy_number);
1075 where[4] = (r_symbolnum >> 16) & 0x0ff;
1076 where[5] = (r_symbolnum >> 8) & 0x0ff;
1077 where[6] = r_symbolnum & 0x0ff;
1078 where[7] = (((!S_IS_DEFINED (fixP->fx_addsy)) << 7) & 0x80) | (0 & 0x60) | (fixP->fx_r_type & 0x1F);
1080 md_number_to_chars (&where[8], fixP->fx_addnumber, 4);
1083 } /* tc_aout_fix_to_chars() */
1085 #endif /* OBJ_AOUT */
1088 md_parse_option (argP, cntP, vecP)
1097 /* Default the values of symbols known that should be "predefined". We
1098 don't bother to predefine them unless you actually use one, since there
1099 are a lot of them. */
1102 md_undefined_symbol (name)
1106 char testbuf[5 + /*SLOP*/ 5];
1108 if (name[0] == 'g' || name[0] == 'G' || name[0] == 'l' || name[0] == 'L')
1110 /* Perhaps a global or local register name */
1111 if (name[1] == 'r' || name[1] == 'R')
1113 /* Parse the number, make sure it has no extra zeroes or trailing
1115 regnum = atol (&name[2]);
1118 sprintf (testbuf, "%ld", regnum);
1119 if (strcmp (testbuf, &name[2]) != 0)
1120 return 0; /* gr007 or lr7foo or whatever */
1122 /* We have a wiener! Define and return a new symbol for it. */
1123 if (name[0] == 'l' || name[0] == 'L')
1125 return (symbol_new (name, SEG_REGISTER, regnum, &zero_address_frag));
1132 /* Parse an operand that is machine-specific. */
1135 md_operand (expressionP)
1136 expressionS *expressionP;
1139 if (input_line_pointer[0] == '%' && input_line_pointer[1] == '%')
1141 /* We have a numeric register expression. No biggy. */
1142 input_line_pointer += 2; /* Skip %% */
1143 (void) expression (expressionP);
1144 if (expressionP->X_seg != SEG_ABSOLUTE
1145 || expressionP->X_add_number > 255)
1146 as_bad ("Invalid expression after %%%%\n");
1147 expressionP->X_seg = SEG_REGISTER;
1149 else if (input_line_pointer[0] == '&')
1151 /* We are taking the 'address' of a register...this one is not
1152 in the manual, but it *is* in traps/fpsymbol.h! What they
1153 seem to want is the register number, as an absolute number. */
1154 input_line_pointer++; /* Skip & */
1155 (void) expression (expressionP);
1156 if (expressionP->X_seg != SEG_REGISTER)
1157 as_bad ("Invalid register in & expression");
1159 expressionP->X_seg = SEG_ABSOLUTE;
1163 /* Round up a section size to the appropriate boundary. */
1165 md_section_align (segment, size)
1169 return size; /* Byte alignment is fine */
1172 /* Exactly what point is a PC-relative offset relative TO?
1173 On the 29000, they're relative to the address of the instruction,
1174 which we have set up as the address of the fixup too. */
1176 md_pcrel_from (fixP)
1179 return fixP->fx_where + fixP->fx_frag->fr_address;
1188 /* end of tc-a29k.c */