Commit | Line | Data |
---|---|---|
f7e42eb4 | 1 | /* This file is tc-tahoe.c |
252b5132 | 2 | |
aef6203b | 3 | Copyright 1987, 1988, 1989, 1990, 1991, 1992, 1995, 2000, 2001, 2002, |
ea1562b3 | 4 | 2003, 2004, 2005 Free Software Foundation, Inc. |
f7e42eb4 NC |
5 | |
6 | This file is part of GAS, the GNU Assembler. | |
7 | ||
8 | GAS is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2, or (at your option) | |
11 | any later version. | |
12 | ||
13 | GAS is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GAS; see the file COPYING. If not, write to the Free | |
4b4da160 NC |
20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
21 | 02110-1301, USA. */ | |
ea1562b3 | 22 | |
252b5132 | 23 | #include "as.h" |
3882b010 | 24 | #include "safe-ctype.h" |
252b5132 RH |
25 | #include "obstack.h" |
26 | ||
f7e42eb4 | 27 | /* This bit glommed from tahoe-inst.h. */ |
252b5132 RH |
28 | |
29 | typedef unsigned char byte; | |
30 | typedef byte tahoe_opcodeT; | |
31 | ||
f7e42eb4 NC |
32 | /* This is part of tahoe-ins-parse.c & friends. |
33 | We want to parse a tahoe instruction text into a tree defined here. */ | |
252b5132 | 34 | |
ea1562b3 NC |
35 | #define TIT_MAX_OPERANDS 4 /* Maximum number of operands in one |
36 | single tahoe instruction. */ | |
252b5132 | 37 | |
ea1562b3 | 38 | struct top /* Tahoe instruction operand. */ |
f7e42eb4 | 39 | { |
ea1562b3 NC |
40 | int top_ndx; /* -1, or index register. eg 7=[R7]. */ |
41 | int top_reg; /* -1, or register number. eg 7 = R7 or (R7). */ | |
f7e42eb4 | 42 | byte top_mode; /* Addressing mode byte. This byte, defines |
a4d24084 | 43 | which of the 11 modes opcode is. */ |
252b5132 | 44 | |
33b7f697 | 45 | char top_access; /* Access type wanted for this operand |
ea1562b3 NC |
46 | 'b'branch ' 'no-instruction 'amrvw'. */ |
47 | char top_width; /* Operand width expected, one of "bwlq?-:!". */ | |
252b5132 | 48 | |
ea1562b3 | 49 | char * top_error; /* Say if operand is inappropriate. */ |
252b5132 | 50 | |
ea1562b3 | 51 | segT seg_of_operand; /* Segment as returned by expression(). */ |
252b5132 | 52 | |
ea1562b3 | 53 | expressionS exp_of_operand; /* The expression as parsed by expression(). */ |
252b5132 | 54 | |
f7e42eb4 | 55 | byte top_dispsize; /* Number of bytes in the displacement if we |
ea1562b3 | 56 | can figure it out. */ |
f7e42eb4 | 57 | }; |
252b5132 | 58 | |
33b7f697 KH |
59 | /* The addressing modes for an operand. These numbers are the actual values |
60 | for certain modes, so be careful if you screw with them. */ | |
ea1562b3 NC |
61 | #define TAHOE_DIRECT_REG 0x50 |
62 | #define TAHOE_REG_DEFERRED 0x60 | |
252b5132 | 63 | |
ea1562b3 NC |
64 | #define TAHOE_REG_DISP 0xE0 |
65 | #define TAHOE_REG_DISP_DEFERRED 0xF0 | |
252b5132 | 66 | |
ea1562b3 NC |
67 | #define TAHOE_IMMEDIATE 0x8F |
68 | #define TAHOE_IMMEDIATE_BYTE 0x88 | |
69 | #define TAHOE_IMMEDIATE_WORD 0x89 | |
70 | #define TAHOE_IMMEDIATE_LONGWORD 0x8F | |
71 | #define TAHOE_ABSOLUTE_ADDR 0x9F | |
252b5132 | 72 | |
ea1562b3 NC |
73 | #define TAHOE_DISPLACED_RELATIVE 0xEF |
74 | #define TAHOE_DISP_REL_DEFERRED 0xFF | |
252b5132 | 75 | |
ea1562b3 NC |
76 | #define TAHOE_AUTO_DEC 0x7E |
77 | #define TAHOE_AUTO_INC 0x8E | |
78 | #define TAHOE_AUTO_INC_DEFERRED 0x9E | |
33b7f697 | 79 | /* INDEXED_REG is decided by the existence or lack of a [reg]. */ |
252b5132 RH |
80 | |
81 | /* These are encoded into top_width when top_access=='b' | |
f7e42eb4 | 82 | and it's a psuedo op. */ |
252b5132 RH |
83 | #define TAHOE_WIDTH_ALWAYS_JUMP '-' |
84 | #define TAHOE_WIDTH_CONDITIONAL_JUMP '?' | |
85 | #define TAHOE_WIDTH_BIG_REV_JUMP '!' | |
86 | #define TAHOE_WIDTH_BIG_NON_REV_JUMP ':' | |
87 | ||
88 | /* The hex code for certain tahoe commands and modes. | |
a4d24084 | 89 | This is just for readability. */ |
ea1562b3 NC |
90 | #define TAHOE_JMP 0x71 |
91 | #define TAHOE_PC_REL_LONG 0xEF | |
92 | #define TAHOE_BRB 0x11 | |
93 | #define TAHOE_BRW 0x13 | |
252b5132 | 94 | /* These, when 'ored' with, or added to, a register number, |
a4d24084 | 95 | set up the number for the displacement mode. */ |
ea1562b3 NC |
96 | #define TAHOE_PC_OR_BYTE 0xA0 |
97 | #define TAHOE_PC_OR_WORD 0xC0 | |
98 | #define TAHOE_PC_OR_LONG 0xE0 | |
252b5132 | 99 | |
f7e42eb4 NC |
100 | struct tit /* Get it out of the sewer, it stands for |
101 | tahoe instruction tree (Geeze!). */ | |
252b5132 | 102 | { |
a4d24084 KH |
103 | tahoe_opcodeT tit_opcode; /* The opcode. */ |
104 | byte tit_operands; /* How many operands are here. */ | |
ea1562b3 NC |
105 | struct top tit_operand[TIT_MAX_OPERANDS]; /* Operands. */ |
106 | char *tit_error; /* "" or fatal error text. */ | |
252b5132 RH |
107 | }; |
108 | ||
109 | /* end: tahoe-inst.h */ | |
110 | ||
111 | /* tahoe.c - tahoe-specific - | |
ea1562b3 | 112 | Not part of gas yet. */ |
252b5132 RH |
113 | |
114 | #include "opcode/tahoe.h" | |
115 | ||
ea1562b3 | 116 | /* This is the number to put at the beginning of the a.out file. */ |
252b5132 RH |
117 | long omagic = OMAGIC; |
118 | ||
119 | /* These chars start a comment anywhere in a source file (except inside | |
a4d24084 | 120 | another comment or a quoted string. */ |
252b5132 RH |
121 | const char comment_chars[] = "#;"; |
122 | ||
a4d24084 | 123 | /* These chars only start a comment at the beginning of a line. */ |
252b5132 RH |
124 | const char line_comment_chars[] = "#"; |
125 | ||
ea1562b3 | 126 | /* Chars that can be used to separate mant from exp in floating point nums. */ |
252b5132 RH |
127 | const char EXP_CHARS[] = "eE"; |
128 | ||
129 | /* Chars that mean this number is a floating point constant | |
130 | as in 0f123.456 | |
131 | or 0d1.234E-12 (see exp chars above) | |
132 | Note: The Tahoe port doesn't support floating point constants. This is | |
33b7f697 | 133 | consistent with 'as' If it's needed, I can always add it later. */ |
252b5132 RH |
134 | const char FLT_CHARS[] = "df"; |
135 | ||
136 | /* Also be aware that MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT may have to be | |
137 | changed in read.c . Ideally it shouldn't have to know about it at all, | |
138 | but nothing is ideal around here. | |
ea1562b3 | 139 | (The tahoe has plenty of room, so the change currently isn't needed.) */ |
252b5132 | 140 | |
a4d24084 | 141 | static struct tit t; /* A tahoe instruction after decoding. */ |
252b5132 RH |
142 | |
143 | void float_cons (); | |
144 | /* A table of pseudo ops (sans .), the function called, and an integer op | |
a4d24084 | 145 | that the function is called with. */ |
252b5132 RH |
146 | |
147 | const pseudo_typeS md_pseudo_table[] = | |
148 | { | |
149 | {"dfloat", float_cons, 'd'}, | |
150 | {"ffloat", float_cons, 'f'}, | |
151 | {0} | |
152 | }; | |
153 | \f | |
ea1562b3 NC |
154 | /* For Tahoe, relative addresses of "just the right length" are pretty easy. |
155 | The branch displacement is always the last operand, even in | |
156 | synthetic instructions. | |
157 | For Tahoe, we encode the relax_substateTs (in e.g. fr_substate) as: | |
158 | ||
159 | 4 3 2 1 0 bit number | |
160 | ---/ /--+-------+-------+-------+-------+-------+ | |
161 | | what state ? | how long ? | | |
162 | ---/ /--+-------+-------+-------+-------+-------+ | |
163 | ||
164 | The "how long" bits are 00=byte, 01=word, 10=long. | |
165 | This is a Un*x convention. | |
166 | Not all lengths are legit for a given value of (what state). | |
167 | The four states are listed below. | |
168 | The "how long" refers merely to the displacement length. | |
169 | The address usually has some constant bytes in it as well. | |
170 | ||
171 | States for Tahoe address relaxing. | |
172 | 1. TAHOE_WIDTH_ALWAYS_JUMP (-) | |
252b5132 RH |
173 | Format: "b-" |
174 | Tahoe opcodes are: (Hex) | |
175 | jr 11 | |
176 | jbr 11 | |
177 | Simple branch. | |
178 | Always, 1 byte opcode, then displacement/absolute. | |
179 | If word or longword, change opcode to brw or jmp. | |
180 | ||
ea1562b3 | 181 | 2. TAHOE_WIDTH_CONDITIONAL_JUMP (?) |
252b5132 RH |
182 | J<cond> where <cond> is a simple flag test. |
183 | Format: "b?" | |
184 | Tahoe opcodes are: (Hex) | |
185 | jneq/jnequ 21 | |
186 | jeql/jeqlu 31 | |
187 | jgtr 41 | |
188 | jleq 51 | |
189 | jgeq 81 | |
190 | jlss 91 | |
191 | jgtru a1 | |
192 | jlequ b1 | |
193 | jvc c1 | |
194 | jvs d1 | |
195 | jlssu/jcs e1 | |
196 | jgequ/jcc f1 | |
197 | Always, you complement 4th bit to reverse the condition. | |
198 | Always, 1-byte opcode, then 1-byte displacement. | |
199 | ||
ea1562b3 | 200 | 3. TAHOE_WIDTH_BIG_REV_JUMP (!) |
252b5132 RH |
201 | Jbc/Jbs where cond tests a memory bit. |
202 | Format: "rlvlb!" | |
203 | Tahoe opcodes are: (Hex) | |
204 | jbs 0e | |
205 | jbc 1e | |
206 | Always, you complement 4th bit to reverse the condition. | |
207 | Always, 1-byte opcde, longword, longword-address, 1-word-displacement | |
208 | ||
ea1562b3 | 209 | 4. TAHOE_WIDTH_BIG_NON_REV_JUMP (:) |
252b5132 RH |
210 | JaoblXX/Jbssi |
211 | Format: "rlmlb:" | |
212 | Tahoe opcodes are: (Hex) | |
213 | aojlss 2f | |
214 | jaoblss 2f | |
215 | aojleq 3f | |
216 | jaobleq 3f | |
217 | jbssi 5f | |
218 | Always, we cannot reverse the sense of the branch; we have a word | |
219 | displacement. | |
220 | ||
ea1562b3 NC |
221 | We need to modify the opcode is for class 1, 2 and 3 instructions. |
222 | After relax() we may complement the 4th bit of 2 or 3 to reverse sense of | |
223 | branch. | |
252b5132 | 224 | |
ea1562b3 NC |
225 | We sometimes store context in the operand literal. This way we can figure out |
226 | after relax() what the original addressing mode was. (Was is pc_rel, or | |
227 | pc_rel_disp? That sort of thing.) */ | |
252b5132 RH |
228 | \f |
229 | /* These displacements are relative to the START address of the | |
230 | displacement which is at the start of the displacement, not the end of | |
231 | the instruction. The hardware pc_rel is at the end of the instructions. | |
232 | That's why all the displacements have the length of the displacement added | |
233 | to them. (WF + length(word)) | |
234 | ||
235 | The first letter is Byte, Word. | |
a4d24084 | 236 | 2nd letter is Forward, Backward. */ |
ea1562b3 NC |
237 | #define BF (1 + 127) |
238 | #define BB (1 + -128) | |
239 | #define WF (2 + 32767) | |
240 | #define WB (2 + -32768) | |
252b5132 RH |
241 | /* Dont need LF, LB because they always reach. [They are coded as 0.] */ |
242 | ||
ea1562b3 | 243 | #define C(a,b) ENCODE_RELAX(a, b) |
a4d24084 | 244 | /* This macro has no side-effects. */ |
252b5132 | 245 | #define ENCODE_RELAX(what,length) (((what) << 2) + (length)) |
ea1562b3 NC |
246 | #define RELAX_STATE(s) ((s) >> 2) |
247 | #define RELAX_LENGTH(s) ((s) & 3) | |
252b5132 | 248 | |
ea1562b3 NC |
249 | #define STATE_ALWAYS_BRANCH 1 |
250 | #define STATE_CONDITIONAL_BRANCH 2 | |
251 | #define STATE_BIG_REV_BRANCH 3 | |
252 | #define STATE_BIG_NON_REV_BRANCH 4 | |
253 | #define STATE_PC_RELATIVE 5 | |
252b5132 | 254 | |
ea1562b3 NC |
255 | #define STATE_BYTE 0 |
256 | #define STATE_WORD 1 | |
257 | #define STATE_LONG 2 | |
258 | #define STATE_UNDF 3 /* Symbol undefined in pass1. */ | |
252b5132 RH |
259 | |
260 | /* This is the table used by gas to figure out relaxing modes. The fields are | |
261 | forward_branch reach, backward_branch reach, number of bytes it would take, | |
a4d24084 | 262 | where the next biggest branch is. */ |
252b5132 RH |
263 | const relax_typeS md_relax_table[] = |
264 | { | |
265 | { | |
266 | 1, 1, 0, 0 | |
ea1562b3 | 267 | }, /* Error sentinel 0,0 */ |
252b5132 RH |
268 | { |
269 | 1, 1, 0, 0 | |
ea1562b3 | 270 | }, /* Unused 0,1 */ |
252b5132 RH |
271 | { |
272 | 1, 1, 0, 0 | |
ea1562b3 | 273 | }, /* Unused 0,2 */ |
252b5132 RH |
274 | { |
275 | 1, 1, 0, 0 | |
ea1562b3 | 276 | }, /* Unused 0,3 */ |
252b5132 RH |
277 | /* Unconditional branch cases "jrb" |
278 | The relax part is the actual displacement */ | |
279 | { | |
280 | BF, BB, 1, C (1, 1) | |
ea1562b3 | 281 | }, /* Brb B`foo 1,0 */ |
252b5132 RH |
282 | { |
283 | WF, WB, 2, C (1, 2) | |
ea1562b3 | 284 | }, /* Brw W`foo 1,1 */ |
252b5132 RH |
285 | { |
286 | 0, 0, 5, 0 | |
287 | }, /* Jmp L`foo 1,2 */ | |
288 | { | |
289 | 1, 1, 0, 0 | |
ea1562b3 | 290 | }, /* Unused 1,3 */ |
252b5132 RH |
291 | /* Reversible Conditional Branch. If the branch won't reach, reverse |
292 | it, and jump over a brw or a jmp that will reach. The relax part is the | |
a4d24084 | 293 | actual address. */ |
252b5132 RH |
294 | { |
295 | BF, BB, 1, C (2, 1) | |
296 | }, /* b<cond> B`foo 2,0 */ | |
297 | { | |
298 | WF + 2, WB + 2, 4, C (2, 2) | |
299 | }, /* brev over, brw W`foo, over: 2,1 */ | |
300 | { | |
301 | 0, 0, 7, 0 | |
302 | }, /* brev over, jmp L`foo, over: 2,2 */ | |
303 | { | |
304 | 1, 1, 0, 0 | |
ea1562b3 | 305 | }, /* Unused 2,3 */ |
33b7f697 | 306 | /* Another type of reversible branch. But this only has a word |
a4d24084 | 307 | displacement. */ |
252b5132 RH |
308 | { |
309 | 1, 1, 0, 0 | |
ea1562b3 | 310 | }, /* Unused 3,0 */ |
252b5132 RH |
311 | { |
312 | WF, WB, 2, C (3, 2) | |
313 | }, /* jbX W`foo 3,1 */ | |
314 | { | |
315 | 0, 0, 8, 0 | |
316 | }, /* jrevX over, jmp L`foo, over: 3,2 */ | |
317 | { | |
318 | 1, 1, 0, 0 | |
ea1562b3 | 319 | }, /* Unused 3,3 */ |
33b7f697 | 320 | /* These are the non reversible branches, all of which have a word |
252b5132 RH |
321 | displacement. If I can't reach, branch over a byte branch, to a |
322 | jump that will reach. The jumped branch jumps over the reaching | |
323 | branch, to continue with the flow of the program. It's like playing | |
a4d24084 | 324 | leap frog. */ |
252b5132 RH |
325 | { |
326 | 1, 1, 0, 0 | |
ea1562b3 | 327 | }, /* Unused 4,0 */ |
252b5132 RH |
328 | { |
329 | WF, WB, 2, C (4, 2) | |
330 | }, /* aobl_ W`foo 4,1 */ | |
331 | { | |
332 | 0, 0, 10, 0 | |
333 | }, /*aobl_ W`hop,br over,hop: jmp L^foo,over 4,2*/ | |
334 | { | |
335 | 1, 1, 0, 0 | |
ea1562b3 | 336 | }, /* Unused 4,3 */ |
252b5132 RH |
337 | /* Normal displacement mode, no jumping or anything like that. |
338 | The relax points to one byte before the address, thats why all | |
a4d24084 | 339 | the numbers are up by one. */ |
252b5132 RH |
340 | { |
341 | BF + 1, BB + 1, 2, C (5, 1) | |
342 | }, /* B^"foo" 5,0 */ | |
343 | { | |
344 | WF + 1, WB + 1, 3, C (5, 2) | |
345 | }, /* W^"foo" 5,1 */ | |
346 | { | |
347 | 0, 0, 5, 0 | |
348 | }, /* L^"foo" 5,2 */ | |
349 | { | |
350 | 1, 1, 0, 0 | |
ea1562b3 | 351 | }, /* Unused 5,3 */ |
252b5132 RH |
352 | }; |
353 | ||
354 | #undef C | |
355 | #undef BF | |
356 | #undef BB | |
357 | #undef WF | |
358 | #undef WB | |
ea1562b3 | 359 | /* End relax stuff. */ |
252b5132 RH |
360 | \f |
361 | /* Handle of the OPCODE hash table. NULL means any use before | |
362 | md_begin() will crash. */ | |
363 | static struct hash_control *op_hash; | |
364 | ||
a4d24084 | 365 | /* Init function. Build the hash table. */ |
ea1562b3 | 366 | |
252b5132 | 367 | void |
ea1562b3 | 368 | md_begin (void) |
252b5132 RH |
369 | { |
370 | struct tot *tP; | |
371 | char *errorval = 0; | |
a4d24084 | 372 | int synthetic_too = 1; /* If 0, just use real opcodes. */ |
252b5132 RH |
373 | |
374 | op_hash = hash_new (); | |
375 | ||
376 | for (tP = totstrs; *tP->name && !errorval; tP++) | |
377 | errorval = hash_insert (op_hash, tP->name, &tP->detail); | |
378 | ||
379 | if (synthetic_too) | |
380 | for (tP = synthetic_totstrs; *tP->name && !errorval; tP++) | |
381 | errorval = hash_insert (op_hash, tP->name, &tP->detail); | |
382 | ||
383 | if (errorval) | |
384 | as_fatal (errorval); | |
385 | } | |
386 | \f | |
5a38dc70 | 387 | const char *md_shortopts = "ad:STt:V"; |
ea1562b3 NC |
388 | |
389 | struct option md_longopts[] = | |
390 | { | |
252b5132 RH |
391 | {NULL, no_argument, NULL, 0} |
392 | }; | |
ea1562b3 | 393 | |
bc805888 | 394 | size_t md_longopts_size = sizeof (md_longopts); |
252b5132 RH |
395 | |
396 | int | |
ea1562b3 | 397 | md_parse_option (int c, char *arg) |
252b5132 RH |
398 | { |
399 | switch (c) | |
400 | { | |
401 | case 'a': | |
402 | as_warn (_("The -a option doesn't exist. (Despite what the man page says!")); | |
403 | break; | |
404 | ||
405 | case 'd': | |
406 | as_warn (_("Displacement length %s ignored!"), arg); | |
407 | break; | |
408 | ||
409 | case 'S': | |
410 | as_warn (_("SYMBOL TABLE not implemented")); | |
411 | break; | |
412 | ||
413 | case 'T': | |
414 | as_warn (_("TOKEN TRACE not implemented")); | |
415 | break; | |
416 | ||
417 | case 't': | |
418 | as_warn (_("I don't need or use temp. file \"%s\"."), arg); | |
419 | break; | |
420 | ||
421 | case 'V': | |
422 | as_warn (_("I don't use an interpass file! -V ignored")); | |
423 | break; | |
424 | ||
425 | default: | |
426 | return 0; | |
427 | } | |
428 | ||
429 | return 1; | |
430 | } | |
431 | ||
432 | void | |
ea1562b3 | 433 | md_show_usage (FILE *stream) |
252b5132 | 434 | { |
bc805888 | 435 | fprintf (stream, _("\ |
252b5132 RH |
436 | Tahoe options:\n\ |
437 | -a ignored\n\ | |
438 | -d LENGTH ignored\n\ | |
439 | -J ignored\n\ | |
440 | -S ignored\n\ | |
441 | -t FILE ignored\n\ | |
442 | -T ignored\n\ | |
443 | -V ignored\n")); | |
444 | } | |
445 | \f | |
446 | /* The functions in this section take numbers in the machine format, and | |
447 | munges them into Tahoe byte order. | |
ea1562b3 NC |
448 | They exist primarily for cross assembly purpose. |
449 | Knows about order of bytes in address. */ | |
252b5132 | 450 | |
ea1562b3 NC |
451 | void |
452 | md_number_to_chars (char con[], /* Return 'nbytes' of chars here. */ | |
453 | valueT value, /* The value of the bits. */ | |
454 | int nbytes) /* Number of bytes in the output. */ | |
252b5132 | 455 | { |
ea1562b3 | 456 | number_to_chars_bigendian (con, value, nbytes); |
252b5132 RH |
457 | } |
458 | ||
252b5132 | 459 | void |
55cf6793 | 460 | md_apply_fix (fixS *fixP ATTRIBUTE_UNUSED, |
ea1562b3 NC |
461 | valueT * valP ATTRIBUTE_UNUSED, |
462 | segT seg ATTRIBUTE_UNUSED) | |
252b5132 | 463 | { |
94f592af | 464 | /* Should never be called. */ |
252b5132 RH |
465 | know (0); |
466 | } | |
467 | ||
ea1562b3 NC |
468 | void |
469 | md_number_to_disp (char con[]m /* Return 'nbytes' of chars here. */ | |
470 | long int value, /* The value of the bits. */ | |
471 | int nbytes) /* Number of bytes in the output. */ | |
252b5132 RH |
472 | { |
473 | md_number_to_chars (con, value, nbytes); | |
474 | } | |
475 | ||
252b5132 | 476 | void |
ea1562b3 NC |
477 | md_number_to_field (char con[], /* Return 'nbytes' of chars here. */ |
478 | long int value, /* The value of the bits. */ | |
479 | int nbytes) /* Number of bytes in the output. */ | |
252b5132 | 480 | { |
ea1562b3 | 481 | md_number_to_chars (con, value, nbytes); |
252b5132 RH |
482 | } |
483 | ||
252b5132 RH |
484 | /* Put the bits in an order that a tahoe will understand, despite the ordering |
485 | of the native machine. | |
486 | On Tahoe: first 4 bytes are normal unsigned big endian long, | |
487 | next three bytes are symbolnum, in kind of 3 byte big endian (least sig. byte last). | |
488 | The last byte is broken up with bit 7 as pcrel, | |
489 | bits 6 & 5 as length, | |
a4d24084 | 490 | bit 4 as extern and the last nibble as 'undefined'. */ |
252b5132 | 491 | |
a4d24084 | 492 | void |
ea1562b3 NC |
493 | tc_aout_fix_to_chars (char *where, |
494 | fixS *fixP, | |
495 | relax_addressT segment_address_in_file) | |
252b5132 RH |
496 | { |
497 | long r_symbolnum; | |
498 | ||
499 | know (fixP->fx_addsy != NULL); | |
500 | ||
501 | md_number_to_chars (where, | |
502 | fixP->fx_frag->fr_address + fixP->fx_where - segment_address_in_file, | |
503 | 4); | |
504 | ||
505 | r_symbolnum = (S_IS_DEFINED (fixP->fx_addsy) | |
506 | ? S_GET_TYPE (fixP->fx_addsy) | |
507 | : fixP->fx_addsy->sy_number); | |
508 | ||
509 | where[4] = (r_symbolnum >> 16) & 0x0ff; | |
510 | where[5] = (r_symbolnum >> 8) & 0x0ff; | |
511 | where[6] = r_symbolnum & 0x0ff; | |
512 | where[7] = (((is_pcrel (fixP) << 7) & 0x80) | |
513 | | ((((fixP->fx_type == FX_8 || fixP->fx_type == FX_PCREL8 | |
514 | ? 0 | |
515 | : (fixP->fx_type == FX_16 || fixP->fx_type == FX_PCREL16 | |
516 | ? 1 | |
517 | : (fixP->fx_type == FX_32 || fixP->fx_type == FX_PCREL32 | |
518 | ? 2 | |
519 | : 42)))) << 5) & 0x60) | |
520 | | ((!S_IS_DEFINED (fixP->fx_addsy) << 4) & 0x10)); | |
521 | } | |
522 | ||
ea1562b3 | 523 | /* Relocate byte stuff. */ |
252b5132 | 524 | \f |
a4d24084 | 525 | /* This is for broken word. */ |
2b4f075a | 526 | int md_short_jump_size = 3; |
252b5132 RH |
527 | |
528 | void | |
ea1562b3 NC |
529 | md_create_short_jump (char *ptr, |
530 | addressT from_addr, | |
531 | addressT to_addr, | |
532 | fragS *frag, | |
533 | symbolS *to_symbol) | |
252b5132 RH |
534 | { |
535 | valueT offset; | |
536 | ||
537 | offset = to_addr - (from_addr + 1); | |
538 | *ptr++ = TAHOE_BRW; | |
539 | md_number_to_chars (ptr, offset, 2); | |
540 | } | |
541 | ||
2b4f075a | 542 | int md_long_jump_size = 6; |
ea1562b3 | 543 | const int md_reloc_size = 8; /* Size of relocation record. */ |
252b5132 RH |
544 | |
545 | void | |
ea1562b3 NC |
546 | md_create_long_jump (char *ptr, |
547 | addressT from_addr, | |
548 | addressT to_addr, | |
549 | fragS *frag, | |
550 | symbolS *to_symbol) | |
252b5132 RH |
551 | { |
552 | valueT offset; | |
553 | ||
554 | offset = to_addr - (from_addr + 4); | |
555 | *ptr++ = TAHOE_JMP; | |
556 | *ptr++ = TAHOE_PC_REL_LONG; | |
557 | md_number_to_chars (ptr, offset, 4); | |
558 | } | |
559 | \f | |
606ab118 AM |
560 | /* md_estimate_size_before_relax(), called just before relax(). |
561 | Any symbol that is now undefined will not become defined. | |
562 | Return the correct fr_subtype in the frag and the growth beyond | |
563 | fr_fix. */ | |
ea1562b3 | 564 | |
252b5132 | 565 | int |
ea1562b3 | 566 | md_estimate_size_before_relax (fragS *fragP, segT segment_type) |
252b5132 | 567 | { |
606ab118 | 568 | if (RELAX_LENGTH (fragP->fr_subtype) == STATE_UNDF) |
252b5132 | 569 | { |
606ab118 | 570 | if (S_GET_SEGMENT (fragP->fr_symbol) != segment) |
252b5132 | 571 | { |
606ab118 AM |
572 | /* Non-relaxable cases. */ |
573 | char *p; | |
574 | int old_fr_fix; | |
252b5132 | 575 | |
606ab118 | 576 | old_fr_fix = fragP->fr_fix; |
252b5132 | 577 | p = fragP->fr_literal + old_fr_fix; |
606ab118 AM |
578 | switch (RELAX_STATE (fragP->fr_subtype)) |
579 | { | |
580 | case STATE_PC_RELATIVE: | |
581 | *p |= TAHOE_PC_OR_LONG; | |
582 | /* We now know how big it will be, one long word. */ | |
583 | fragP->fr_fix += 1 + 4; | |
584 | fix_new (fragP, old_fr_fix + 1, fragP->fr_symbol, | |
585 | fragP->fr_offset, FX_PCREL32, NULL); | |
586 | break; | |
587 | ||
588 | case STATE_CONDITIONAL_BRANCH: | |
589 | *fragP->fr_opcode ^= 0x10; /* Reverse sense of branch. */ | |
590 | *p++ = 6; | |
591 | *p++ = TAHOE_JMP; | |
592 | *p++ = TAHOE_PC_REL_LONG; | |
593 | fragP->fr_fix += 1 + 1 + 1 + 4; | |
594 | fix_new (fragP, old_fr_fix + 3, fragP->fr_symbol, | |
595 | fragP->fr_offset, FX_PCREL32, NULL); | |
596 | break; | |
597 | ||
598 | case STATE_BIG_REV_BRANCH: | |
599 | *fragP->fr_opcode ^= 0x10; /* Reverse sense of branch. */ | |
600 | *p++ = 0; | |
601 | *p++ = 6; | |
602 | *p++ = TAHOE_JMP; | |
603 | *p++ = TAHOE_PC_REL_LONG; | |
604 | fragP->fr_fix += 2 + 2 + 4; | |
605 | fix_new (fragP, old_fr_fix + 4, fragP->fr_symbol, | |
606 | fragP->fr_offset, FX_PCREL32, NULL); | |
607 | break; | |
608 | ||
609 | case STATE_BIG_NON_REV_BRANCH: | |
610 | *p++ = 2; | |
611 | *p++ = 0; | |
612 | *p++ = TAHOE_BRB; | |
613 | *p++ = 6; | |
614 | *p++ = TAHOE_JMP; | |
615 | *p++ = TAHOE_PC_REL_LONG; | |
616 | fragP->fr_fix += 2 + 2 + 2 + 4; | |
617 | fix_new (fragP, old_fr_fix + 6, fragP->fr_symbol, | |
618 | fragP->fr_offset, FX_PCREL32, NULL); | |
619 | break; | |
620 | ||
621 | case STATE_ALWAYS_BRANCH: | |
622 | *fragP->fr_opcode = TAHOE_JMP; | |
623 | *p++ = TAHOE_PC_REL_LONG; | |
624 | fragP->fr_fix += 1 + 4; | |
625 | fix_new (fragP, old_fr_fix + 1, fragP->fr_symbol, | |
626 | fragP->fr_offset, FX_PCREL32, NULL); | |
627 | break; | |
628 | ||
629 | default: | |
630 | abort (); | |
631 | } | |
252b5132 | 632 | frag_wane (fragP); |
252b5132 | 633 | |
606ab118 AM |
634 | /* Return the growth in the fixed part of the frag. */ |
635 | return fragP->fr_fix - old_fr_fix; | |
252b5132 | 636 | } |
252b5132 | 637 | |
606ab118 AM |
638 | /* Relaxable cases. Set up the initial guess for the variable |
639 | part of the frag. */ | |
640 | switch (RELAX_STATE (fragP->fr_subtype)) | |
252b5132 | 641 | { |
606ab118 AM |
642 | case STATE_PC_RELATIVE: |
643 | fragP->fr_subtype = ENCODE_RELAX (STATE_PC_RELATIVE, STATE_BYTE); | |
644 | break; | |
645 | case STATE_CONDITIONAL_BRANCH: | |
646 | fragP->fr_subtype = ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_BYTE); | |
647 | break; | |
648 | case STATE_BIG_REV_BRANCH: | |
649 | fragP->fr_subtype = ENCODE_RELAX (STATE_BIG_REV_BRANCH, STATE_WORD); | |
650 | break; | |
651 | case STATE_BIG_NON_REV_BRANCH: | |
252b5132 | 652 | fragP->fr_subtype = ENCODE_RELAX (STATE_BIG_NON_REV_BRANCH, STATE_WORD); |
606ab118 AM |
653 | break; |
654 | case STATE_ALWAYS_BRANCH: | |
252b5132 | 655 | fragP->fr_subtype = ENCODE_RELAX (STATE_ALWAYS_BRANCH, STATE_BYTE); |
606ab118 | 656 | break; |
252b5132 | 657 | } |
252b5132 | 658 | } |
606ab118 AM |
659 | |
660 | if (fragP->fr_subtype >= sizeof (md_relax_table) / sizeof (md_relax_table[0])) | |
661 | abort (); | |
662 | ||
663 | /* Return the size of the variable part of the frag. */ | |
664 | return md_relax_table[fragP->fr_subtype].rlx_length; | |
665 | } | |
252b5132 | 666 | \f |
ea1562b3 NC |
667 | /* Called after relax() is finished. |
668 | In: Address of frag. | |
669 | fr_type == rs_machine_dependent. | |
670 | fr_subtype is what the address relaxed to. | |
671 | ||
672 | Out: Any fixSs and constants are set up. | |
673 | Caller will turn frag into a ".space 0". */ | |
674 | ||
252b5132 | 675 | void |
ea1562b3 | 676 | md_convert_frag (object_headers *headers, segT seg, fragS *fragP) |
252b5132 | 677 | { |
ea1562b3 NC |
678 | char *addressP; /* -> _var to change. */ |
679 | char *opcodeP; /* -> opcode char(s) to change. */ | |
680 | short int extension = 0; /* Size of relaxed address. | |
681 | Added to fr_fix: incl. ALL var chars. */ | |
682 | symbolS *symbolP; | |
683 | long int where; | |
684 | long int address_of_var; | |
685 | /* Where, in file space, is _var of *fragP? */ | |
686 | long int target_address; | |
687 | /* Where, in file space, does addr point? */ | |
252b5132 RH |
688 | |
689 | know (fragP->fr_type == rs_machine_dependent); | |
252b5132 RH |
690 | where = fragP->fr_fix; |
691 | addressP = fragP->fr_literal + where; | |
692 | opcodeP = fragP->fr_opcode; | |
693 | symbolP = fragP->fr_symbol; | |
694 | know (symbolP); | |
695 | target_address = S_GET_VALUE (symbolP) + fragP->fr_offset; | |
696 | address_of_var = fragP->fr_address + where; | |
ea1562b3 | 697 | |
252b5132 RH |
698 | switch (fragP->fr_subtype) |
699 | { | |
700 | case ENCODE_RELAX (STATE_PC_RELATIVE, STATE_BYTE): | |
701 | /* *addressP holds the registers number, plus 0x10, if it's deferred | |
ea1562b3 | 702 | mode. To set up the right mode, just OR the size of this displacement. */ |
a4d24084 | 703 | /* Byte displacement. */ |
252b5132 RH |
704 | *addressP++ |= TAHOE_PC_OR_BYTE; |
705 | *addressP = target_address - (address_of_var + 2); | |
706 | extension = 2; | |
707 | break; | |
708 | ||
709 | case ENCODE_RELAX (STATE_PC_RELATIVE, STATE_WORD): | |
a4d24084 | 710 | /* Word displacement. */ |
252b5132 RH |
711 | *addressP++ |= TAHOE_PC_OR_WORD; |
712 | md_number_to_chars (addressP, target_address - (address_of_var + 3), 2); | |
713 | extension = 3; | |
714 | break; | |
715 | ||
716 | case ENCODE_RELAX (STATE_PC_RELATIVE, STATE_LONG): | |
a4d24084 | 717 | /* Long word displacement. */ |
252b5132 RH |
718 | *addressP++ |= TAHOE_PC_OR_LONG; |
719 | md_number_to_chars (addressP, target_address - (address_of_var + 5), 4); | |
720 | extension = 5; | |
721 | break; | |
722 | ||
723 | case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_BYTE): | |
724 | *addressP = target_address - (address_of_var + 1); | |
725 | extension = 1; | |
726 | break; | |
727 | ||
728 | case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_WORD): | |
a4d24084 | 729 | *opcodeP ^= 0x10; /* Reverse sense of test. */ |
ea1562b3 | 730 | *addressP++ = 3; /* Jump over word branch. */ |
252b5132 RH |
731 | *addressP++ = TAHOE_BRW; |
732 | md_number_to_chars (addressP, target_address - (address_of_var + 4), 2); | |
733 | extension = 4; | |
734 | break; | |
735 | ||
736 | case ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, STATE_LONG): | |
a4d24084 | 737 | *opcodeP ^= 0x10; /* Reverse sense of test. */ |
252b5132 RH |
738 | *addressP++ = 6; |
739 | *addressP++ = TAHOE_JMP; | |
740 | *addressP++ = TAHOE_PC_REL_LONG; | |
741 | md_number_to_chars (addressP, target_address, 4); | |
742 | extension = 7; | |
743 | break; | |
744 | ||
745 | case ENCODE_RELAX (STATE_ALWAYS_BRANCH, STATE_BYTE): | |
746 | *addressP = target_address - (address_of_var + 1); | |
747 | extension = 1; | |
748 | break; | |
749 | ||
750 | case ENCODE_RELAX (STATE_ALWAYS_BRANCH, STATE_WORD): | |
751 | *opcodeP = TAHOE_BRW; | |
752 | md_number_to_chars (addressP, target_address - (address_of_var + 2), 2); | |
753 | extension = 2; | |
754 | break; | |
755 | ||
756 | case ENCODE_RELAX (STATE_ALWAYS_BRANCH, STATE_LONG): | |
757 | *opcodeP = TAHOE_JMP; | |
758 | *addressP++ = TAHOE_PC_REL_LONG; | |
759 | md_number_to_chars (addressP, target_address - (address_of_var + 5), 4); | |
760 | extension = 5; | |
761 | break; | |
762 | ||
763 | case ENCODE_RELAX (STATE_BIG_REV_BRANCH, STATE_WORD): | |
764 | md_number_to_chars (addressP, target_address - (address_of_var + 2), 2); | |
765 | extension = 2; | |
766 | break; | |
767 | ||
768 | case ENCODE_RELAX (STATE_BIG_REV_BRANCH, STATE_LONG): | |
769 | *opcodeP ^= 0x10; | |
770 | *addressP++ = 0; | |
771 | *addressP++ = 6; | |
772 | *addressP++ = TAHOE_JMP; | |
773 | *addressP++ = TAHOE_PC_REL_LONG; | |
774 | md_number_to_chars (addressP, target_address, 4); | |
775 | extension = 8; | |
776 | break; | |
777 | ||
778 | case ENCODE_RELAX (STATE_BIG_NON_REV_BRANCH, STATE_WORD): | |
779 | md_number_to_chars (addressP, target_address - (address_of_var + 2), 2); | |
780 | extension = 2; | |
781 | break; | |
782 | ||
783 | case ENCODE_RELAX (STATE_BIG_NON_REV_BRANCH, STATE_LONG): | |
784 | *addressP++ = 0; | |
785 | *addressP++ = 2; | |
786 | *addressP++ = TAHOE_BRB; | |
787 | *addressP++ = 6; | |
788 | *addressP++ = TAHOE_JMP; | |
789 | *addressP++ = TAHOE_PC_REL_LONG; | |
790 | md_number_to_chars (addressP, target_address, 4); | |
791 | extension = 10; | |
792 | break; | |
793 | ||
794 | default: | |
795 | BAD_CASE (fragP->fr_subtype); | |
796 | break; | |
797 | } | |
798 | fragP->fr_fix += extension; | |
ea1562b3 | 799 | } |
252b5132 RH |
800 | \f |
801 | ||
a4d24084 | 802 | /* This is the stuff for md_assemble. */ |
252b5132 RH |
803 | #define FP_REG 13 |
804 | #define SP_REG 14 | |
805 | #define PC_REG 15 | |
806 | #define BIGGESTREG PC_REG | |
807 | ||
ea1562b3 NC |
808 | /* Parse the string pointed to by START |
809 | If it represents a valid register, point START to the character after | |
810 | the last valid register char, and return the register number (0-15). | |
811 | If invalid, leave START alone, return -1. | |
812 | The format has to be exact. I don't do things like eat leading zeros | |
813 | or the like. | |
814 | Note: This doesn't check for the next character in the string making | |
815 | this invalid. Ex: R123 would return 12, it's the callers job to check | |
816 | what start is point to apon return. | |
817 | ||
818 | Valid registers are R1-R15, %1-%15, FP (13), SP (14), PC (15) | |
819 | Case doesn't matter. */ | |
820 | ||
252b5132 | 821 | int |
ea1562b3 | 822 | tahoe_reg_parse (char **start) /* A pointer to the string to parse. */ |
252b5132 | 823 | { |
ea1562b3 NC |
824 | char *regpoint = *start; |
825 | int regnum = -1; | |
252b5132 RH |
826 | |
827 | switch (*regpoint++) | |
828 | { | |
829 | case '%': /* Registers can start with a %, | |
a4d24084 | 830 | R or r, and then a number. */ |
252b5132 RH |
831 | case 'R': |
832 | case 'r': | |
3882b010 | 833 | if (ISDIGIT (*regpoint)) |
252b5132 | 834 | { |
a4d24084 | 835 | /* Got the first digit. */ |
252b5132 | 836 | regnum = *regpoint++ - '0'; |
3882b010 | 837 | if ((regnum == 1) && ISDIGIT (*regpoint)) |
252b5132 | 838 | { |
a4d24084 | 839 | /* Its a two digit number. */ |
252b5132 RH |
840 | regnum = 10 + (*regpoint++ - '0'); |
841 | if (regnum > BIGGESTREG) | |
ea1562b3 | 842 | regnum = -1; |
252b5132 RH |
843 | } |
844 | } | |
845 | break; | |
ea1562b3 | 846 | case 'F': /* Is it the FP. */ |
252b5132 RH |
847 | case 'f': |
848 | switch (*regpoint++) | |
849 | { | |
850 | case 'p': | |
851 | case 'P': | |
852 | regnum = FP_REG; | |
853 | } | |
854 | break; | |
ea1562b3 | 855 | case 's': /* How about the SP. */ |
252b5132 RH |
856 | case 'S': |
857 | switch (*regpoint++) | |
858 | { | |
859 | case 'p': | |
860 | case 'P': | |
861 | regnum = SP_REG; | |
862 | } | |
863 | break; | |
ea1562b3 | 864 | case 'p': /* Or the PC even. */ |
252b5132 RH |
865 | case 'P': |
866 | switch (*regpoint++) | |
867 | { | |
868 | case 'c': | |
869 | case 'C': | |
870 | regnum = PC_REG; | |
871 | } | |
872 | break; | |
873 | } | |
874 | ||
875 | if (regnum != -1) | |
ea1562b3 NC |
876 | /* No error, so move string pointer. */ |
877 | *start = regpoint; | |
878 | ||
879 | return regnum; | |
880 | } | |
252b5132 | 881 | \f |
ea1562b3 NC |
882 | /* This chops up an operand and figures out its modes and stuff. |
883 | It's a little touchy about extra characters. | |
884 | Optex to start with one extra character so it can be overwritten for | |
885 | the backward part of the parsing. | |
886 | You can't put a bunch of extra characters in side to | |
887 | make the command look cute. ie: * foo ( r1 ) [ r0 ] | |
888 | If you like doing a lot of typing, try COBOL! | |
889 | Actually, this parser is a little weak all around. It's designed to be | |
890 | used with compliers, so I emphasize correct decoding of valid code quickly | |
891 | rather that catching every possible error. | |
892 | Note: This uses the expression function, so save input_line_pointer before | |
893 | calling. | |
894 | ||
895 | Sperry defines the semantics of address modes (and values) | |
896 | by a two-letter code, explained here. | |
897 | ||
898 | letter 1: access type | |
899 | ||
900 | a address calculation - no data access, registers forbidden | |
901 | b branch displacement | |
902 | m read - let go of bus - write back "modify" | |
903 | r read | |
904 | w write | |
905 | v bit field address: like 'a' but registers are OK | |
906 | ||
907 | letter 2: data type (i.e. width, alignment) | |
908 | ||
909 | b byte | |
910 | w word | |
911 | l longword | |
912 | q quadword (Even regs < 14 allowed) (if 12, you get a warning) | |
913 | - unconditional synthetic jbr operand | |
914 | ? simple synthetic reversible branch operand | |
915 | ! complex synthetic reversible branch operand | |
916 | : complex synthetic non-reversible branch operand | |
917 | ||
918 | The '-?!:' letter 2's are not for external consumption. They are used | |
919 | by GAS for psuedo ops relaxing code. | |
920 | ||
921 | After parsing topP has: | |
922 | ||
923 | top_ndx: -1, or the index register. eg 7=[R7] | |
924 | top_reg: -1, or register number. eg 7 = R7 or (R7) | |
925 | top_mode: The addressing mode byte. This byte, defines which of | |
926 | the 11 modes opcode is. | |
927 | top_access: Access type wanted for this operand 'b'branch ' ' | |
928 | no-instruction 'amrvw' | |
929 | top_width: Operand width expected, one of "bwlq?-:!" | |
930 | exp_of_operand: The expression as parsed by expression() | |
931 | top_dispsize: Number of bytes in the displacement if we can figure it | |
932 | out and it's relevant. | |
933 | ||
934 | Need syntax checks built. */ | |
252b5132 RH |
935 | |
936 | void | |
ea1562b3 NC |
937 | tip_op (char *optex, /* The users text input, with one leading character. */ |
938 | struct top *topP) /* The tahoe instruction with some fields already set: | |
939 | in: access, width | |
940 | out: ndx, reg, mode, error, dispsize. */ | |
252b5132 | 941 | { |
a4d24084 KH |
942 | int mode = 0; /* This operand's mode. */ |
943 | char segfault = *optex; /* To keep the back parsing from freaking. */ | |
944 | char *point = optex + 1; /* Parsing from front to back. */ | |
945 | char *end; /* Parsing from back to front. */ | |
ea1562b3 NC |
946 | int reg = -1; /* major register, -1 means absent. */ |
947 | int imreg = -1; /* Major register in immediate mode. */ | |
948 | int ndx = -1; /* index register number, -1 means absent. */ | |
252b5132 | 949 | char dec_inc = ' '; /* Is the SP auto-incremented '+' or |
a4d24084 | 950 | auto-decremented '-' or neither ' '. */ |
ea1562b3 NC |
951 | int immediate = 0; /* 1 if '$' immediate mode. */ |
952 | int call_width = 0; /* If the caller casts the displacement. */ | |
953 | int abs_width = 0; /* The width of the absolute displacement. */ | |
954 | int com_width = 0; /* Displacement width required by branch. */ | |
955 | int deferred = 0; /* 1 if '*' deferral is used. */ | |
956 | byte disp_size = 0; /* How big is this operand. 0 == don't know. */ | |
957 | char *op_bad = ""; /* Bad operand error. */ | |
958 | char *tp, *temp, c; /* Temporary holders. */ | |
959 | char access = topP->top_access;/* Save on a deref. */ | |
252b5132 | 960 | char width = topP->top_width; |
252b5132 | 961 | int really_none = 0; /* Empty expressions evaluate to 0 |
ea1562b3 NC |
962 | but I need to know if it's there or not. */ |
963 | expressionS *expP; /* -> expression values for this operand. */ | |
252b5132 | 964 | |
a4d24084 | 965 | /* Does this command restrict the displacement size. */ |
252b5132 RH |
966 | if (access == 'b') |
967 | com_width = (width == 'b' ? 1 : | |
968 | (width == 'w' ? 2 : | |
969 | (width == 'l' ? 4 : 0))); | |
970 | ||
971 | *optex = '\0'; /* This is kind of a back stop for all | |
ea1562b3 | 972 | the searches to fail on if needed. */ |
252b5132 | 973 | if (*point == '*') |
ea1562b3 NC |
974 | { |
975 | /* A dereference? */ | |
252b5132 RH |
976 | deferred = 1; |
977 | point++; | |
978 | } | |
979 | ||
ea1562b3 NC |
980 | /* Force words into a certain mode. */ |
981 | /* Using the ^ operator is ambiguous. If I have an absolute label | |
982 | called 'w' set to, say 2, and I have the expression 'w^1', do I get | |
983 | 1, forced to be in word displacement mode, or do I get the value of | |
984 | 'w' or'ed with 1 (3 in this case). | |
985 | The default is 'w' as an offset, so that's what I use. | |
986 | Stick with `, it does the same, and isn't ambig. */ | |
252b5132 RH |
987 | |
988 | if (*point != '\0' && ((point[1] == '^') || (point[1] == '`'))) | |
989 | switch (*point) | |
990 | { | |
991 | case 'b': | |
992 | case 'B': | |
993 | case 'w': | |
994 | case 'W': | |
995 | case 'l': | |
996 | case 'L': | |
997 | if (com_width) | |
998 | as_warn (_("Casting a branch displacement is bad form, and is ignored.")); | |
999 | else | |
1000 | { | |
3882b010 | 1001 | c = TOLOWER (*point); |
252b5132 RH |
1002 | call_width = ((c == 'b') ? 1 : |
1003 | ((c == 'w') ? 2 : 4)); | |
1004 | } | |
1005 | point += 2; | |
1006 | break; | |
1007 | } | |
1008 | ||
ea1562b3 | 1009 | /* Setting immediate mode. */ |
252b5132 RH |
1010 | if (*point == '$') |
1011 | { | |
1012 | immediate = 1; | |
1013 | point++; | |
1014 | } | |
1015 | ||
ea1562b3 NC |
1016 | /* I've pulled off all the easy stuff off the front, move to the end and |
1017 | yank. */ | |
252b5132 | 1018 | |
a4d24084 | 1019 | for (end = point; *end != '\0'; end++) /* Move to the end. */ |
252b5132 RH |
1020 | ; |
1021 | ||
ea1562b3 | 1022 | if (end != point) /* Null string? */ |
252b5132 RH |
1023 | end--; |
1024 | ||
1025 | if (end > point && *end == ' ' && end[-1] != '\'') | |
ea1562b3 | 1026 | end--; /* Hop white space. */ |
252b5132 | 1027 | |
a4d24084 | 1028 | /* Is this an index reg. */ |
252b5132 RH |
1029 | if ((*end == ']') && (end[-1] != '\'')) |
1030 | { | |
1031 | temp = end; | |
1032 | ||
a4d24084 | 1033 | /* Find opening brace. */ |
252b5132 RH |
1034 | for (--end; (*end != '[' && end != point); end--) |
1035 | ; | |
1036 | ||
a4d24084 | 1037 | /* If I found the opening brace, get the index register number. */ |
252b5132 RH |
1038 | if (*end == '[') |
1039 | { | |
a4d24084 | 1040 | tp = end + 1; /* tp should point to the start of a reg. */ |
252b5132 RH |
1041 | ndx = tahoe_reg_parse (&tp); |
1042 | if (tp != temp) | |
ea1562b3 NC |
1043 | /* Reg. parse error. */ |
1044 | ndx = -1; | |
252b5132 | 1045 | else |
ea1562b3 NC |
1046 | /* Found it, move past brace. */ |
1047 | end--; | |
1048 | ||
252b5132 RH |
1049 | if (ndx == -1) |
1050 | { | |
1051 | op_bad = _("Couldn't parse the [index] in this operand."); | |
a4d24084 | 1052 | end = point; /* Force all the rest of the tests to fail. */ |
252b5132 RH |
1053 | } |
1054 | } | |
1055 | else | |
1056 | { | |
1057 | op_bad = _("Couldn't find the opening '[' for the index of this operand."); | |
a4d24084 | 1058 | end = point; /* Force all the rest of the tests to fail. */ |
252b5132 RH |
1059 | } |
1060 | } | |
1061 | ||
1062 | /* Post increment? */ | |
1063 | if (*end == '+') | |
1064 | { | |
1065 | dec_inc = '+'; | |
1066 | /* was: *end--; */ | |
1067 | end--; | |
1068 | } | |
1069 | ||
ea1562b3 | 1070 | /* Register in parens? */ |
252b5132 RH |
1071 | if ((*end == ')') && (end[-1] != '\'')) |
1072 | { | |
1073 | temp = end; | |
1074 | ||
a4d24084 | 1075 | /* Find opening paren. */ |
252b5132 RH |
1076 | for (--end; (*end != '(' && end != point); end--) |
1077 | ; | |
1078 | ||
a4d24084 | 1079 | /* If I found the opening paren, get the register number. */ |
252b5132 RH |
1080 | if (*end == '(') |
1081 | { | |
1082 | tp = end + 1; | |
1083 | reg = tahoe_reg_parse (&tp); | |
1084 | if (tp != temp) | |
1085 | { | |
a4d24084 | 1086 | /* Not a register, but could be part of the expression. */ |
252b5132 | 1087 | reg = -1; |
ea1562b3 NC |
1088 | /* Rest the pointer back. */ |
1089 | end = temp; | |
252b5132 RH |
1090 | } |
1091 | else | |
ea1562b3 NC |
1092 | /* Found the reg. move before opening paren. */ |
1093 | end--; | |
252b5132 RH |
1094 | } |
1095 | else | |
1096 | { | |
1097 | op_bad = _("Couldn't find the opening '(' for the deref of this operand."); | |
ea1562b3 NC |
1098 | /* Force all the rest of the tests to fail. */ |
1099 | end = point; | |
252b5132 RH |
1100 | } |
1101 | } | |
1102 | ||
ea1562b3 | 1103 | /* Pre decrement? */ |
252b5132 RH |
1104 | if (*end == '-') |
1105 | { | |
1106 | if (dec_inc != ' ') | |
1107 | { | |
1108 | op_bad = _("Operand can't be both pre-inc and post-dec."); | |
1109 | end = point; | |
1110 | } | |
1111 | else | |
1112 | { | |
1113 | dec_inc = '-'; | |
252b5132 RH |
1114 | end--; |
1115 | } | |
1116 | } | |
1117 | ||
ea1562b3 NC |
1118 | /* Everything between point and end is the 'expression', unless it's |
1119 | a register name. */ | |
252b5132 RH |
1120 | c = end[1]; |
1121 | end[1] = '\0'; | |
1122 | ||
1123 | tp = point; | |
ea1562b3 NC |
1124 | /* Get the immediate register if it is there. */ |
1125 | imreg = tahoe_reg_parse (&point); | |
252b5132 RH |
1126 | if (*point != '\0') |
1127 | { | |
a4d24084 | 1128 | /* If there is junk after point, then the it's not immediate reg. */ |
252b5132 RH |
1129 | point = tp; |
1130 | imreg = -1; | |
1131 | } | |
1132 | ||
1133 | if (imreg != -1 && reg != -1) | |
1134 | op_bad = _("I parsed 2 registers in this operand."); | |
1135 | ||
ea1562b3 NC |
1136 | /* Evaluate whats left of the expression to see if it's valid. |
1137 | Note again: This assumes that the calling expression has saved | |
1138 | input_line_pointer. (Nag, nag, nag!). */ | |
252b5132 RH |
1139 | if (*op_bad == '\0') |
1140 | { | |
1994a7c7 | 1141 | /* Statement has no syntax goofs yet: let's sniff the expression. */ |
252b5132 RH |
1142 | input_line_pointer = point; |
1143 | expP = &(topP->exp_of_operand); | |
1144 | topP->seg_of_operand = expression (expP); | |
1145 | switch (expP->X_op) | |
1146 | { | |
1147 | case O_absent: | |
1148 | /* No expression. For BSD4.2 compatibility, missing expression is | |
ea1562b3 | 1149 | absolute 0. */ |
252b5132 RH |
1150 | expP->X_op = O_constant; |
1151 | expP->X_add_number = 0; | |
1152 | really_none = 1; | |
1153 | case O_constant: | |
ea1562b3 | 1154 | /* For SEG_ABSOLUTE, we shouldn't need to set X_op_symbol, |
a4d24084 | 1155 | X_add_symbol to any particular value. */ |
252b5132 | 1156 | /* But, we will program defensively. Since this situation occurs |
a4d24084 | 1157 | rarely so it costs us little to do so. */ |
252b5132 RH |
1158 | expP->X_add_symbol = NULL; |
1159 | expP->X_op_symbol = NULL; | |
ea1562b3 | 1160 | /* How many bytes are needed to express this abs value? */ |
252b5132 | 1161 | abs_width = |
ea1562b3 NC |
1162 | ((((expP->X_add_number & 0xFFFFFF80) == 0) |
1163 | || ((expP->X_add_number & 0xFFFFFF80) == 0xFFFFFF80)) ? 1 : | |
1164 | (((expP->X_add_number & 0xFFFF8000) == 0) | |
1165 | || ((expP->X_add_number & 0xFFFF8000) == 0xFFFF8000)) ? 2 : 4); | |
252b5132 RH |
1166 | |
1167 | case O_symbol: | |
1168 | break; | |
1169 | ||
1170 | default: | |
ea1562b3 NC |
1171 | /* Major bug. We can't handle the case of an operator |
1172 | expression in a synthetic opcode variable-length | |
1173 | instruction. We don't have a frag type that is smart | |
1174 | enough to relax an operator, and so we just force all | |
1175 | operators to behave like SEG_PASS1s. Clearly, if there is | |
1176 | a demand we can invent a new or modified frag type and | |
1177 | then coding up a frag for this case will be easy. */ | |
252b5132 RH |
1178 | need_pass_2 = 1; |
1179 | op_bad = _("Can't relocate expression error."); | |
1180 | break; | |
1181 | ||
1182 | case O_big: | |
1183 | /* This is an error. Tahoe doesn't allow any expressions | |
1184 | bigger that a 32 bit long word. Any bigger has to be referenced | |
a4d24084 | 1185 | by address. */ |
252b5132 RH |
1186 | op_bad = _("Expression is too large for a 32 bits."); |
1187 | break; | |
1188 | } | |
ea1562b3 | 1189 | |
252b5132 | 1190 | if (*input_line_pointer != '\0') |
ea1562b3 | 1191 | op_bad = _("Junk at end of expression."); |
252b5132 RH |
1192 | } |
1193 | ||
1194 | end[1] = c; | |
1195 | ||
ea1562b3 | 1196 | /* I'm done, so restore optex. */ |
252b5132 RH |
1197 | *optex = segfault; |
1198 | ||
ea1562b3 NC |
1199 | /* At this point in the game, we (in theory) have all the components of |
1200 | the operand at least parsed. Now it's time to check for syntax/semantic | |
1201 | errors, and build the mode. | |
1202 | This is what I have: | |
1203 | deferred = 1 if '*' | |
1204 | call_width = 0,1,2,4 | |
1205 | abs_width = 0,1,2,4 | |
1206 | com_width = 0,1,2,4 | |
1207 | immediate = 1 if '$' | |
1208 | ndx = -1 or reg num | |
1209 | dec_inc = '-' or '+' or ' ' | |
1210 | reg = -1 or reg num | |
1211 | imreg = -1 or reg num | |
1212 | topP->exp_of_operand | |
1213 | really_none. */ | |
1214 | /* Is there a displacement size? */ | |
252b5132 RH |
1215 | disp_size = (call_width ? call_width : |
1216 | (com_width ? com_width : | |
1217 | abs_width ? abs_width : 0)); | |
1218 | ||
1219 | if (*op_bad == '\0') | |
1220 | { | |
1221 | if (imreg != -1) | |
1222 | { | |
1223 | /* Rn */ | |
1224 | mode = TAHOE_DIRECT_REG; | |
ea1562b3 NC |
1225 | if (deferred |
1226 | || immediate | |
1227 | || (dec_inc != ' ') | |
1228 | || (reg != -1) | |
1229 | || !really_none) | |
252b5132 RH |
1230 | op_bad = _("Syntax error in direct register mode."); |
1231 | else if (ndx != -1) | |
1232 | op_bad = _("You can't index a register in direct register mode."); | |
1233 | else if (imreg == SP_REG && access == 'r') | |
1234 | op_bad = | |
1235 | _("SP can't be the source operand with direct register addressing."); | |
1236 | else if (access == 'a') | |
1237 | op_bad = _("Can't take the address of a register."); | |
1238 | else if (access == 'b') | |
1239 | op_bad = _("Direct Register can't be used in a branch."); | |
1240 | else if (width == 'q' && ((imreg % 2) || (imreg > 13))) | |
1241 | op_bad = _("For quad access, the register must be even and < 14."); | |
1242 | else if (call_width) | |
1243 | op_bad = _("You can't cast a direct register."); | |
1244 | ||
1245 | if (*op_bad == '\0') | |
1246 | { | |
ea1562b3 | 1247 | /* No errors, check for warnings. */ |
252b5132 RH |
1248 | if (width == 'q' && imreg == 12) |
1249 | as_warn (_("Using reg 14 for quadwords can tromp the FP register.")); | |
1250 | ||
1251 | reg = imreg; | |
1252 | } | |
1253 | ||
ea1562b3 | 1254 | /* We know: imm = -1. */ |
252b5132 RH |
1255 | } |
1256 | else if (dec_inc == '-') | |
1257 | { | |
1258 | /* -(SP) */ | |
1259 | mode = TAHOE_AUTO_DEC; | |
1260 | if (deferred || immediate || !really_none) | |
1261 | op_bad = _("Syntax error in auto-dec mode."); | |
1262 | else if (ndx != -1) | |
1263 | op_bad = _("You can't have an index auto dec mode."); | |
1264 | else if (access == 'r') | |
1265 | op_bad = _("Auto dec mode cant be used for reading."); | |
1266 | else if (reg != SP_REG) | |
1267 | op_bad = _("Auto dec only works of the SP register."); | |
1268 | else if (access == 'b') | |
1269 | op_bad = _("Auto dec can't be used in a branch."); | |
1270 | else if (width == 'q') | |
1271 | op_bad = _("Auto dec won't work with quadwords."); | |
1272 | ||
ea1562b3 | 1273 | /* We know: imm = -1, dec_inc != '-'. */ |
252b5132 RH |
1274 | } |
1275 | else if (dec_inc == '+') | |
1276 | { | |
1277 | if (immediate || !really_none) | |
1278 | op_bad = _("Syntax error in one of the auto-inc modes."); | |
1279 | else if (deferred) | |
1280 | { | |
1281 | /* *(SP)+ */ | |
1282 | mode = TAHOE_AUTO_INC_DEFERRED; | |
1283 | if (reg != SP_REG) | |
1284 | op_bad = _("Auto inc deferred only works of the SP register."); | |
1285 | else if (ndx != -1) | |
1286 | op_bad = _("You can't have an index auto inc deferred mode."); | |
1287 | else if (access == 'b') | |
1288 | op_bad = _("Auto inc can't be used in a branch."); | |
1289 | } | |
1290 | else | |
1291 | { | |
1292 | /* (SP)+ */ | |
1293 | mode = TAHOE_AUTO_INC; | |
1294 | if (access == 'm' || access == 'w') | |
1295 | op_bad = _("You can't write to an auto inc register."); | |
1296 | else if (reg != SP_REG) | |
1297 | op_bad = _("Auto inc only works of the SP register."); | |
1298 | else if (access == 'b') | |
1299 | op_bad = _("Auto inc can't be used in a branch."); | |
1300 | else if (width == 'q') | |
1301 | op_bad = _("Auto inc won't work with quadwords."); | |
1302 | else if (ndx != -1) | |
1303 | op_bad = _("You can't have an index in auto inc mode."); | |
1304 | } | |
1305 | ||
ea1562b3 | 1306 | /* We know: imm = -1, dec_inc == ' '. */ |
252b5132 RH |
1307 | } |
1308 | else if (reg != -1) | |
1309 | { | |
1310 | if ((ndx != -1) && (reg == SP_REG)) | |
1311 | op_bad = _("You can't index the sp register."); | |
1312 | if (deferred) | |
1313 | { | |
1314 | /* *<disp>(Rn) */ | |
1315 | mode = TAHOE_REG_DISP_DEFERRED; | |
1316 | if (immediate) | |
1317 | op_bad = _("Syntax error in register displaced mode."); | |
1318 | } | |
1319 | else if (really_none) | |
ea1562b3 NC |
1320 | /* (Rn) */ |
1321 | mode = TAHOE_REG_DEFERRED; | |
252b5132 | 1322 | else |
ea1562b3 NC |
1323 | /* <disp>(Rn) */ |
1324 | mode = TAHOE_REG_DISP; | |
252b5132 RH |
1325 | |
1326 | /* We know: imm = -1, dec_inc == ' ', Reg = -1 */ | |
1327 | } | |
1328 | else | |
1329 | { | |
1330 | if (really_none) | |
1331 | op_bad = _("An offest is needed for this operand."); | |
1332 | if (deferred && immediate) | |
1333 | { | |
1334 | /* *$<ADDR> */ | |
1335 | mode = TAHOE_ABSOLUTE_ADDR; | |
1336 | disp_size = 4; | |
1337 | } | |
1338 | else if (immediate) | |
1339 | { | |
1340 | /* $<disp> */ | |
1341 | mode = TAHOE_IMMEDIATE; | |
1342 | if (ndx != -1) | |
1343 | op_bad = _("You can't index a register in immediate mode."); | |
1344 | if (access == 'a') | |
1345 | op_bad = _("Immediate access can't be used as an address."); | |
a4d24084 | 1346 | /* ponder the wisdom of a cast because it doesn't do any good. */ |
252b5132 RH |
1347 | } |
1348 | else if (deferred) | |
ea1562b3 NC |
1349 | /* *<disp> */ |
1350 | mode = TAHOE_DISP_REL_DEFERRED; | |
252b5132 | 1351 | else |
ea1562b3 NC |
1352 | /* <disp> */ |
1353 | mode = TAHOE_DISPLACED_RELATIVE; | |
252b5132 RH |
1354 | } |
1355 | } | |
1356 | ||
ea1562b3 NC |
1357 | /* At this point, all the errors we can do have be checked for. |
1358 | We can build the 'top'. */ | |
252b5132 RH |
1359 | topP->top_ndx = ndx; |
1360 | topP->top_reg = reg; | |
1361 | topP->top_mode = mode; | |
1362 | topP->top_error = op_bad; | |
1363 | topP->top_dispsize = disp_size; | |
ea1562b3 | 1364 | } |
252b5132 | 1365 | \f |
ea1562b3 NC |
1366 | /* This converts a string into a tahoe instruction. |
1367 | The string must be a bare single instruction in tahoe (with BSD4 frobs) | |
1368 | format. | |
1369 | It provides at most one fatal error message (which stops the scan) | |
1370 | some warning messages as it finds them. | |
1371 | The tahoe instruction is returned in exploded form. | |
1372 | ||
1373 | The exploded instruction is returned to a struct tit of your choice. | |
1374 | #include "tahoe-inst.h" to know what a struct tit is. */ | |
252b5132 RH |
1375 | |
1376 | static void | |
ea1562b3 NC |
1377 | tip (struct tit *titP, /* We build an exploded instruction here. */ |
1378 | char *instring) /* Text of a vax instruction: we modify. */ | |
252b5132 | 1379 | { |
ea1562b3 NC |
1380 | struct tot_wot *twP = NULL; /* How to bit-encode this opcode. */ |
1381 | char *p; /* 1/skip whitespace.2/scan vot_how. */ | |
1382 | char *q; | |
1383 | unsigned char count; /* Counts number of operands seen. */ | |
1384 | struct top *operandp; /* Scan operands in struct tit. */ | |
1385 | char *alloperr = ""; /* Error over all operands. */ | |
1386 | char c; /* Remember char, (we clobber it with '\0' temporarily). */ | |
252b5132 RH |
1387 | char *save_input_line_pointer; |
1388 | ||
1389 | if (*instring == ' ') | |
a4d24084 | 1390 | ++instring; /* Skip leading whitespace. */ |
252b5132 | 1391 | for (p = instring; *p && *p != ' '; p++) |
ea1562b3 NC |
1392 | ; |
1393 | ||
a4d24084 KH |
1394 | /* Scanned up to end of operation-code. */ |
1395 | /* Operation-code is ended with whitespace. */ | |
252b5132 RH |
1396 | if (p == instring) |
1397 | { | |
1398 | titP->tit_error = _("No operator"); | |
1399 | count = 0; | |
1400 | titP->tit_opcode = 0; | |
1401 | } | |
1402 | else | |
1403 | { | |
1404 | c = *p; | |
1405 | *p = '\0'; | |
ea1562b3 NC |
1406 | |
1407 | /* Here with instring pointing to what better be an op-name, and p | |
1408 | pointing to character just past that. | |
1409 | We trust instring points to an op-name, with no whitespace. */ | |
252b5132 | 1410 | twP = (struct tot_wot *) hash_find (op_hash, instring); |
ea1562b3 NC |
1411 | /* Restore char after op-code. */ |
1412 | *p = c; | |
252b5132 RH |
1413 | if (twP == 0) |
1414 | { | |
1415 | titP->tit_error = _("Unknown operator"); | |
1416 | count = 0; | |
1417 | titP->tit_opcode = 0; | |
1418 | } | |
1419 | else | |
1420 | { | |
ea1562b3 NC |
1421 | /* We found a match! So let's pick up as many operands as the |
1422 | instruction wants, and even gripe if there are too many. | |
1423 | We expect comma to separate each operand. | |
1424 | We let instring track the text, while p tracks a part of the | |
1425 | struct tot. */ | |
1426 | ||
1427 | /* No operands seen yet. */ | |
1428 | count = 0; | |
1429 | /* Point past the operation code. */ | |
1430 | instring = p + (*p != '\0'); | |
252b5132 | 1431 | /* tip_op() screws with the input_line_pointer, so save it before |
ea1562b3 | 1432 | I jump in. */ |
252b5132 | 1433 | save_input_line_pointer = input_line_pointer; |
ea1562b3 | 1434 | |
252b5132 RH |
1435 | for (p = twP->args, operandp = titP->tit_operand; |
1436 | !*alloperr && *p; | |
1437 | operandp++, p += 2) | |
1438 | { | |
ea1562b3 NC |
1439 | /* Here to parse one operand. Leave instring pointing just |
1440 | past any one ',' that marks the end of this operand. */ | |
252b5132 RH |
1441 | if (!p[1]) |
1442 | as_fatal (_("Compiler bug: ODD number of bytes in arg structure %s."), | |
1443 | twP->args); | |
1444 | else if (*instring) | |
1445 | { | |
1446 | for (q = instring; (*q != ',' && *q != '\0'); q++) | |
ea1562b3 NC |
1447 | /* Jump quoted characters. */ |
1448 | if (*q == '\'' && q[1] != '\0') | |
1449 | q++; | |
1450 | ||
252b5132 | 1451 | c = *q; |
ea1562b3 NC |
1452 | /* Q points to ',' or '\0' that ends argument. C is that |
1453 | character. */ | |
252b5132 RH |
1454 | *q = '\0'; |
1455 | operandp->top_access = p[0]; | |
1456 | operandp->top_width = p[1]; | |
1457 | tip_op (instring - 1, operandp); | |
ea1562b3 NC |
1458 | /* Restore input text. */ |
1459 | *q = c; | |
1460 | ||
252b5132 | 1461 | if (*(operandp->top_error)) |
ea1562b3 NC |
1462 | alloperr = operandp->top_error; |
1463 | ||
1464 | /* Next operand (if any). */ | |
1465 | instring = q + (c ? 1 : 0); | |
1466 | /* Won another argument, may have an operr. */ | |
1467 | count++; | |
252b5132 RH |
1468 | } |
1469 | else | |
1470 | alloperr = _("Not enough operands"); | |
1471 | } | |
a4d24084 | 1472 | /* Restore the pointer. */ |
252b5132 RH |
1473 | input_line_pointer = save_input_line_pointer; |
1474 | ||
1475 | if (!*alloperr) | |
1476 | { | |
ea1562b3 | 1477 | /* Skip whitespace. */ |
252b5132 | 1478 | if (*instring == ' ') |
ea1562b3 NC |
1479 | instring ++; |
1480 | ||
252b5132 RH |
1481 | if (*instring) |
1482 | alloperr = _("Too many operands"); | |
1483 | } | |
ea1562b3 | 1484 | |
252b5132 RH |
1485 | titP->tit_error = alloperr; |
1486 | } | |
1487 | } | |
1488 | ||
ea1562b3 | 1489 | titP->tit_opcode = twP->code; |
252b5132 | 1490 | titP->tit_operands = count; |
ea1562b3 | 1491 | } |
252b5132 | 1492 | \f |
252b5132 | 1493 | void |
ea1562b3 | 1494 | md_assemble (char *instruction_string) |
252b5132 RH |
1495 | { |
1496 | char *p; | |
ea1562b3 NC |
1497 | struct top *operandP; /* An operand. Scans all operands. */ |
1498 | expressionS *expP; /* -> expression values for this operand. */ | |
a4d24084 | 1499 | /* These refer to an instruction operand expression. */ |
252b5132 | 1500 | segT to_seg; /* Target segment of the address. */ |
ea1562b3 NC |
1501 | valueT this_add_number; |
1502 | symbolS *this_add_symbol; /* +ve (minuend) symbol. */ | |
a4d24084 | 1503 | char *opcodeP; /* Where it is in a frag. */ |
ea1562b3 NC |
1504 | int dispsize; /* From top_dispsize: tahoe_operand_width (in bytes). */ |
1505 | int is_undefined; /* 1 if operand expression's segment not known yet. */ | |
1506 | int pc_rel; /* Is this operand pc relative? */ | |
252b5132 | 1507 | |
a4d24084 | 1508 | /* Decode the operand. */ |
252b5132 RH |
1509 | tip (&t, instruction_string); |
1510 | ||
ea1562b3 NC |
1511 | /* Check to see if this operand decode properly. |
1512 | Notice that we haven't made any frags yet. | |
1513 | If it goofed, then this instruction will wedge in any pass, | |
1514 | and we can safely flush it, without causing interpass symbol phase | |
1515 | errors. That is, without changing label values in different passes. */ | |
1516 | ||
252b5132 | 1517 | if (*t.tit_error) |
ea1562b3 | 1518 | as_warn (_("Ignoring statement due to \"%s\""), t.tit_error); |
252b5132 RH |
1519 | else |
1520 | { | |
ea1562b3 | 1521 | /* We saw no errors in any operands - try to make frag(s). */ |
a4d24084 KH |
1522 | /* Emit op-code. */ |
1523 | /* Remember where it is, in case we want to modify the op-code later. */ | |
252b5132 RH |
1524 | opcodeP = frag_more (1); |
1525 | *opcodeP = t.tit_opcode; | |
a4d24084 | 1526 | /* Now do each operand. */ |
252b5132 RH |
1527 | for (operandP = t.tit_operand; |
1528 | operandP < t.tit_operand + t.tit_operands; | |
1529 | operandP++) | |
1530 | { /* for each operand */ | |
1531 | expP = &(operandP->exp_of_operand); | |
1532 | if (operandP->top_ndx >= 0) | |
1533 | { | |
1534 | /* Indexed addressing byte | |
ea1562b3 | 1535 | Legality of indexed mode already checked: it is OK. */ |
252b5132 RH |
1536 | FRAG_APPEND_1_CHAR (0x40 + operandP->top_ndx); |
1537 | } /* if(top_ndx>=0) */ | |
1538 | ||
a4d24084 | 1539 | /* Here to make main operand frag(s). */ |
252b5132 RH |
1540 | this_add_number = expP->X_add_number; |
1541 | this_add_symbol = expP->X_add_symbol; | |
1542 | to_seg = operandP->seg_of_operand; | |
ea1562b3 NC |
1543 | know (to_seg == SEG_UNKNOWN \ |
1544 | || to_seg == SEG_ABSOLUTE \ | |
1545 | || to_seg == SEG_DATA \ | |
1546 | || to_seg == SEG_TEXT \ | |
1547 | || to_seg == SEG_BSS); | |
252b5132 | 1548 | is_undefined = (to_seg == SEG_UNKNOWN); |
ea1562b3 | 1549 | /* Do we know how big this operand is? */ |
252b5132 RH |
1550 | dispsize = operandP->top_dispsize; |
1551 | pc_rel = 0; | |
ea1562b3 | 1552 | /* Deal with the branch possibilities. (Note, this doesn't include jumps.) */ |
252b5132 RH |
1553 | if (operandP->top_access == 'b') |
1554 | { | |
1555 | /* Branches must be expressions. A psuedo branch can also jump to | |
ea1562b3 | 1556 | an absolute address. */ |
252b5132 RH |
1557 | if (to_seg == now_seg || is_undefined) |
1558 | { | |
a4d24084 | 1559 | /* If is_undefined, then it might BECOME now_seg by relax time. */ |
252b5132 RH |
1560 | if (dispsize) |
1561 | { | |
1562 | /* I know how big the branch is supposed to be (it's a normal | |
ea1562b3 | 1563 | branch), so I set up the frag, and let GAS do the rest. */ |
252b5132 RH |
1564 | p = frag_more (dispsize); |
1565 | fix_new (frag_now, p - frag_now->fr_literal, | |
1566 | this_add_symbol, this_add_number, | |
1567 | size_to_fx (dispsize, 1), | |
1568 | NULL); | |
1569 | } | |
1570 | else | |
1571 | { | |
252b5132 | 1572 | /* If we don't know how big it is, then its a synthetic branch, |
ea1562b3 | 1573 | so we set up a simple relax state. */ |
252b5132 RH |
1574 | switch (operandP->top_width) |
1575 | { | |
1576 | case TAHOE_WIDTH_CONDITIONAL_JUMP: | |
1577 | /* Simple (conditional) jump. I may have to reverse the | |
ea1562b3 NC |
1578 | condition of opcodeP, and then jump to my destination. |
1579 | I set 1 byte aside for the branch off set, and could need 6 | |
1580 | more bytes for the pc_rel jump. */ | |
252b5132 RH |
1581 | frag_var (rs_machine_dependent, 7, 1, |
1582 | ENCODE_RELAX (STATE_CONDITIONAL_BRANCH, | |
1583 | is_undefined ? STATE_UNDF : STATE_BYTE), | |
1584 | this_add_symbol, this_add_number, opcodeP); | |
1585 | break; | |
1586 | case TAHOE_WIDTH_ALWAYS_JUMP: | |
1587 | /* Simple (unconditional) jump. I may have to convert this to | |
ea1562b3 | 1588 | a word branch, or an absolute jump. */ |
252b5132 RH |
1589 | frag_var (rs_machine_dependent, 5, 1, |
1590 | ENCODE_RELAX (STATE_ALWAYS_BRANCH, | |
1591 | is_undefined ? STATE_UNDF : STATE_BYTE), | |
1592 | this_add_symbol, this_add_number, opcodeP); | |
1593 | break; | |
a4d24084 | 1594 | /* The smallest size for the next 2 cases is word. */ |
252b5132 RH |
1595 | case TAHOE_WIDTH_BIG_REV_JUMP: |
1596 | frag_var (rs_machine_dependent, 8, 2, | |
1597 | ENCODE_RELAX (STATE_BIG_REV_BRANCH, | |
1598 | is_undefined ? STATE_UNDF : STATE_WORD), | |
1599 | this_add_symbol, this_add_number, | |
1600 | opcodeP); | |
1601 | break; | |
1602 | case TAHOE_WIDTH_BIG_NON_REV_JUMP: | |
1603 | frag_var (rs_machine_dependent, 10, 2, | |
1604 | ENCODE_RELAX (STATE_BIG_NON_REV_BRANCH, | |
1605 | is_undefined ? STATE_UNDF : STATE_WORD), | |
1606 | this_add_symbol, this_add_number, | |
1607 | opcodeP); | |
1608 | break; | |
1609 | default: | |
1610 | as_fatal (_("Compliler bug: Got a case (%d) I wasn't expecting."), | |
1611 | operandP->top_width); | |
1612 | } | |
1613 | } | |
1614 | } | |
1615 | else | |
1616 | { | |
1617 | /* to_seg != now_seg && to_seg != seg_unknown (still in branch) | |
ea1562b3 NC |
1618 | In other words, I'm jumping out of my segment so extend the |
1619 | branches to jumps, and let GAS fix them. */ | |
252b5132 RH |
1620 | |
1621 | /* These are "branches" what will always be branches around a jump | |
ea1562b3 NC |
1622 | to the correct address in real life. |
1623 | If to_seg is SEG_ABSOLUTE, just encode the branch in, | |
1624 | else let GAS fix the address. */ | |
252b5132 RH |
1625 | |
1626 | switch (operandP->top_width) | |
1627 | { | |
1628 | /* The theory: | |
ea1562b3 NC |
1629 | For SEG_ABSOLUTE, then mode is ABSOLUTE_ADDR, jump |
1630 | to that address (not pc_rel). | |
1631 | For other segs, address is a long word PC rel jump. */ | |
252b5132 RH |
1632 | case TAHOE_WIDTH_CONDITIONAL_JUMP: |
1633 | /* b<cond> */ | |
1634 | /* To reverse the condition in a TAHOE branch, | |
ea1562b3 | 1635 | complement bit 4 */ |
252b5132 RH |
1636 | *opcodeP ^= 0x10; |
1637 | p = frag_more (7); | |
1638 | *p++ = 6; | |
1639 | *p++ = TAHOE_JMP; | |
1640 | *p++ = (operandP->top_mode == | |
1641 | TAHOE_ABSOLUTE_ADDR ? TAHOE_ABSOLUTE_ADDR : | |
1642 | TAHOE_PC_REL_LONG); | |
1643 | fix_new (frag_now, p - frag_now->fr_literal, | |
1644 | this_add_symbol, this_add_number, | |
1645 | (to_seg != SEG_ABSOLUTE) ? FX_PCREL32 : FX_32, NULL); | |
ea1562b3 NC |
1646 | |
1647 | /* Now (eg) BLEQ 1f | |
1648 | JMP foo | |
1649 | 1: */ | |
252b5132 | 1650 | break; |
ea1562b3 | 1651 | |
252b5132 | 1652 | case TAHOE_WIDTH_ALWAYS_JUMP: |
ea1562b3 | 1653 | /* Br, just turn it into a jump. */ |
252b5132 RH |
1654 | *opcodeP = TAHOE_JMP; |
1655 | p = frag_more (5); | |
1656 | *p++ = (operandP->top_mode == | |
1657 | TAHOE_ABSOLUTE_ADDR ? TAHOE_ABSOLUTE_ADDR : | |
1658 | TAHOE_PC_REL_LONG); | |
1659 | fix_new (frag_now, p - frag_now->fr_literal, | |
1660 | this_add_symbol, this_add_number, | |
1661 | (to_seg != SEG_ABSOLUTE) ? FX_PCREL32 : FX_32, NULL); | |
ea1562b3 | 1662 | /* Now (eg) JMP foo. */ |
252b5132 | 1663 | break; |
ea1562b3 | 1664 | |
252b5132 RH |
1665 | case TAHOE_WIDTH_BIG_REV_JUMP: |
1666 | p = frag_more (8); | |
1667 | *opcodeP ^= 0x10; | |
1668 | *p++ = 0; | |
1669 | *p++ = 6; | |
1670 | *p++ = TAHOE_JMP; | |
1671 | *p++ = (operandP->top_mode == | |
1672 | TAHOE_ABSOLUTE_ADDR ? TAHOE_ABSOLUTE_ADDR : | |
1673 | TAHOE_PC_REL_LONG); | |
1674 | fix_new (frag_now, p - frag_now->fr_literal, | |
1675 | this_add_symbol, this_add_number, | |
1676 | (to_seg != SEG_ABSOLUTE) ? FX_PCREL32 : FX_32, NULL); | |
ea1562b3 NC |
1677 | /* Now (eg) ACBx 1f |
1678 | JMP foo | |
1679 | 1: */ | |
252b5132 | 1680 | break; |
ea1562b3 | 1681 | |
252b5132 RH |
1682 | case TAHOE_WIDTH_BIG_NON_REV_JUMP: |
1683 | p = frag_more (10); | |
1684 | *p++ = 0; | |
1685 | *p++ = 2; | |
1686 | *p++ = TAHOE_BRB; | |
1687 | *p++ = 6; | |
1688 | *p++ = TAHOE_JMP; | |
1689 | *p++ = (operandP->top_mode == | |
1690 | TAHOE_ABSOLUTE_ADDR ? TAHOE_ABSOLUTE_ADDR : | |
1691 | TAHOE_PC_REL_LONG); | |
1692 | fix_new (frag_now, p - frag_now->fr_literal, | |
1693 | this_add_symbol, this_add_number, | |
1694 | (to_seg != SEG_ABSOLUTE) ? FX_PCREL32 : FX_32, NULL); | |
ea1562b3 NC |
1695 | /* Now (eg) xOBxxx 1f |
1696 | BRB 2f | |
1697 | 1: JMP @#foo | |
1698 | 2: */ | |
252b5132 RH |
1699 | break; |
1700 | case 'b': | |
1701 | case 'w': | |
1702 | as_warn (_("Real branch displacements must be expressions.")); | |
1703 | break; | |
1704 | default: | |
1705 | as_fatal (_("Complier error: I got an unknown synthetic branch :%c"), | |
1706 | operandP->top_width); | |
1707 | break; | |
1708 | } | |
1709 | } | |
1710 | } | |
1711 | else | |
1712 | { | |
a4d24084 | 1713 | /* It ain't a branch operand. */ |
252b5132 RH |
1714 | switch (operandP->top_mode) |
1715 | { | |
1716 | /* Auto-foo access, only works for one reg (SP) | |
ea1562b3 | 1717 | so the only thing needed is the mode. */ |
252b5132 RH |
1718 | case TAHOE_AUTO_DEC: |
1719 | case TAHOE_AUTO_INC: | |
1720 | case TAHOE_AUTO_INC_DEFERRED: | |
1721 | FRAG_APPEND_1_CHAR (operandP->top_mode); | |
1722 | break; | |
1723 | ||
1724 | /* Numbered Register only access. Only thing needed is the | |
ea1562b3 | 1725 | mode + Register number. */ |
252b5132 RH |
1726 | case TAHOE_DIRECT_REG: |
1727 | case TAHOE_REG_DEFERRED: | |
1728 | FRAG_APPEND_1_CHAR (operandP->top_mode + operandP->top_reg); | |
1729 | break; | |
1730 | ||
1731 | /* An absolute address. It's size is always 5 bytes. | |
ea1562b3 | 1732 | (mode_type + 4 byte address). */ |
252b5132 RH |
1733 | case TAHOE_ABSOLUTE_ADDR: |
1734 | know ((this_add_symbol == NULL)); | |
1735 | p = frag_more (5); | |
1736 | *p = TAHOE_ABSOLUTE_ADDR; | |
1737 | md_number_to_chars (p + 1, this_add_number, 4); | |
1738 | break; | |
1739 | ||
1740 | /* Immediate data. If the size isn't known, then it's an address | |
ea1562b3 | 1741 | + and offset, which is 4 bytes big. */ |
252b5132 RH |
1742 | case TAHOE_IMMEDIATE: |
1743 | if (this_add_symbol != NULL) | |
1744 | { | |
1745 | p = frag_more (5); | |
1746 | *p++ = TAHOE_IMMEDIATE_LONGWORD; | |
1747 | fix_new (frag_now, p - frag_now->fr_literal, | |
1748 | this_add_symbol, this_add_number, | |
1749 | FX_32, NULL); | |
1750 | } | |
1751 | else | |
1752 | { | |
b6ff326e | 1753 | /* It's an integer, and I know it's size. */ |
252b5132 | 1754 | if ((unsigned) this_add_number < 0x40) |
ea1562b3 NC |
1755 | /* Will it fit in a literal? */ |
1756 | FRAG_APPEND_1_CHAR ((byte) this_add_number); | |
252b5132 RH |
1757 | else |
1758 | { | |
1759 | p = frag_more (dispsize + 1); | |
1760 | switch (dispsize) | |
1761 | { | |
1762 | case 1: | |
1763 | *p++ = TAHOE_IMMEDIATE_BYTE; | |
1764 | *p = (byte) this_add_number; | |
1765 | break; | |
1766 | case 2: | |
1767 | *p++ = TAHOE_IMMEDIATE_WORD; | |
1768 | md_number_to_chars (p, this_add_number, 2); | |
1769 | break; | |
1770 | case 4: | |
1771 | *p++ = TAHOE_IMMEDIATE_LONGWORD; | |
1772 | md_number_to_chars (p, this_add_number, 4); | |
1773 | break; | |
1774 | } | |
1775 | } | |
1776 | } | |
1777 | break; | |
1778 | ||
1779 | /* Distance from the PC. If the size isn't known, we have to relax | |
ea1562b3 NC |
1780 | into it. The difference between this and disp(sp) is that |
1781 | this offset is pc_rel, and disp(sp) isn't. | |
1782 | Note the drop through code. */ | |
252b5132 RH |
1783 | |
1784 | case TAHOE_DISPLACED_RELATIVE: | |
1785 | case TAHOE_DISP_REL_DEFERRED: | |
1786 | operandP->top_reg = PC_REG; | |
1787 | pc_rel = 1; | |
1788 | ||
1789 | /* Register, plus a displacement mode. Save the register number, | |
ea1562b3 NC |
1790 | and weather its deffered or not, and relax the size if it isn't |
1791 | known. */ | |
252b5132 RH |
1792 | case TAHOE_REG_DISP: |
1793 | case TAHOE_REG_DISP_DEFERRED: | |
ea1562b3 NC |
1794 | if (operandP->top_mode == TAHOE_DISP_REL_DEFERRED |
1795 | || operandP->top_mode == TAHOE_REG_DISP_DEFERRED) | |
1796 | /* Deffered mode is always 0x10 higher than it's non-deffered sibling. */ | |
1797 | operandP->top_reg += 0x10; | |
252b5132 RH |
1798 | |
1799 | /* Is this a value out of this segment? | |
ea1562b3 NC |
1800 | The first part of this conditional is a cludge to make gas |
1801 | produce the same output as 'as' when there is a lable, in | |
1802 | the current segment, displacing a register. It's strange, | |
1803 | and no one in their right mind would do it, but it's easy | |
1804 | to cludge. */ | |
1805 | if ((dispsize == 0 && !pc_rel) | |
1806 | || (to_seg != now_seg && !is_undefined && to_seg != SEG_ABSOLUTE)) | |
252b5132 RH |
1807 | dispsize = 4; |
1808 | ||
1809 | if (dispsize == 0) | |
1810 | { | |
ea1562b3 NC |
1811 | /* We have a SEG_UNKNOWN symbol, or the size isn't cast. |
1812 | It might turn out to be in the same segment as | |
1813 | the instruction, permitting relaxation. */ | |
252b5132 RH |
1814 | p = frag_var (rs_machine_dependent, 5, 2, |
1815 | ENCODE_RELAX (STATE_PC_RELATIVE, | |
1816 | is_undefined ? STATE_UNDF : STATE_BYTE), | |
1817 | this_add_symbol, this_add_number, 0); | |
1818 | *p = operandP->top_reg; | |
1819 | } | |
1820 | else | |
1821 | { | |
a4d24084 | 1822 | /* Either this is an abs, or a cast. */ |
252b5132 RH |
1823 | p = frag_more (dispsize + 1); |
1824 | switch (dispsize) | |
1825 | { | |
1826 | case 1: | |
1827 | *p = TAHOE_PC_OR_BYTE + operandP->top_reg; | |
1828 | break; | |
1829 | case 2: | |
1830 | *p = TAHOE_PC_OR_WORD + operandP->top_reg; | |
1831 | break; | |
1832 | case 4: | |
1833 | *p = TAHOE_PC_OR_LONG + operandP->top_reg; | |
1834 | break; | |
1835 | }; | |
1836 | fix_new (frag_now, p + 1 - frag_now->fr_literal, | |
1837 | this_add_symbol, this_add_number, | |
1838 | size_to_fx (dispsize, pc_rel), NULL); | |
1839 | } | |
1840 | break; | |
1841 | default: | |
1842 | as_fatal (_("Barf, bad mode %x\n"), operandP->top_mode); | |
1843 | } | |
1844 | } | |
ea1562b3 NC |
1845 | } |
1846 | } | |
1847 | } | |
252b5132 | 1848 | |
a4d24084 | 1849 | /* We have no need to default values of symbols. */ |
252b5132 | 1850 | |
252b5132 | 1851 | symbolS * |
ea1562b3 | 1852 | md_undefined_symbol (char *name) |
252b5132 RH |
1853 | { |
1854 | return 0; | |
ea1562b3 | 1855 | } |
252b5132 | 1856 | |
a4d24084 | 1857 | /* Round up a section size to the appropriate boundary. */ |
ea1562b3 | 1858 | |
252b5132 | 1859 | valueT |
ea1562b3 | 1860 | md_section_align (segT segment, valueT size) |
252b5132 | 1861 | { |
ea1562b3 NC |
1862 | /* Round all sects to multiple of 8. */ |
1863 | return ((size + 7) & ~7); | |
1864 | } | |
252b5132 RH |
1865 | |
1866 | /* Exactly what point is a PC-relative offset relative TO? | |
1867 | On the sparc, they're relative to the address of the offset, plus | |
1868 | its size. This gets us to the following instruction. | |
1869 | (??? Is this right? FIXME-SOON) */ | |
ea1562b3 | 1870 | |
a4d24084 | 1871 | long |
ea1562b3 | 1872 | md_pcrel_from (fixS *fixP) |
252b5132 RH |
1873 | { |
1874 | return (((fixP->fx_type == FX_8 | |
1875 | || fixP->fx_type == FX_PCREL8) | |
1876 | ? 1 | |
1877 | : ((fixP->fx_type == FX_16 | |
1878 | || fixP->fx_type == FX_PCREL16) | |
1879 | ? 2 | |
1880 | : ((fixP->fx_type == FX_32 | |
1881 | || fixP->fx_type == FX_PCREL32) | |
1882 | ? 4 | |
1883 | : 0))) + fixP->fx_where + fixP->fx_frag->fr_address); | |
ea1562b3 | 1884 | } |
252b5132 | 1885 | |
a4d24084 | 1886 | int |
ea1562b3 | 1887 | tc_is_pcrel (fixS *fixP) |
252b5132 | 1888 | { |
ea1562b3 | 1889 | /* Should never be called. */ |
252b5132 | 1890 | know (0); |
ea1562b3 NC |
1891 | return 0; |
1892 | } |