1 /* tc-v850.c -- Assembler code for the NEC V850
3 Copyright (C) 1996 Free Software Foundation.
5 This file is part of GAS, the GNU Assembler.
7 GAS is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GAS is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GAS; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
26 #include "opcode/v850.h"
28 /* Structure to hold information about predefined registers. */
35 /* Generic assembler global variables which must be defined by all targets. */
37 /* Characters which always start a comment. */
38 const char comment_chars
[] = "#";
40 /* Characters which start a comment at the beginning of a line. */
41 const char line_comment_chars
[] = ";#";
43 /* Characters which may be used to separate multiple commands on a
45 const char line_separator_chars
[] = ";";
47 /* Characters which are used to indicate an exponent in a floating
49 const char EXP_CHARS
[] = "eE";
51 /* Characters which mean that a number is a floating point constant,
53 const char FLT_CHARS
[] = "dD";
57 static unsigned long v850_insert_operand
58 PARAMS ((unsigned long insn
, const struct v850_operand
*operand
,
59 offsetT val
, char *file
, unsigned int line
));
60 static int reg_name_search
PARAMS ((const struct reg_name
*, int, const char *));
61 static boolean register_name
PARAMS ((expressionS
*expressionP
));
62 static boolean system_register_name
PARAMS ((expressionS
*expressionP
));
63 static boolean cc_name
PARAMS ((expressionS
*expressionP
));
64 static bfd_reloc_code_real_type v850_reloc_prefix
PARAMS ((void));
68 #define MAX_INSN_FIXUPS (5)
73 bfd_reloc_code_real_type reloc
;
75 struct v850_fixup fixups
[MAX_INSN_FIXUPS
];
78 const char *md_shortopts
= "";
79 struct option md_longopts
[] = {
80 {NULL
, no_argument
, NULL
, 0}
82 size_t md_longopts_size
= sizeof(md_longopts
);
84 /* The target specific pseudo-ops which we support. */
85 const pseudo_typeS md_pseudo_table
[] =
91 /* Opcode hash table. */
92 static struct hash_control
*v850_hash
;
94 /* This table is sorted. Suitable for searching by a binary search. */
95 static const struct reg_name pre_defined_registers
[] =
97 { "ep", 30 }, /* ep - element ptr */
98 { "gp", 4 }, /* gp - global ptr */
99 { "lp", 31 }, /* lp - link ptr */
132 { "sp", 3 }, /* sp - stack ptr */
133 { "tp", 5 }, /* tp - text ptr */
136 #define REG_NAME_CNT (sizeof(pre_defined_registers) / sizeof(struct reg_name))
139 static const struct reg_name system_registers
[] =
148 #define SYSREG_NAME_CNT (sizeof(system_registers) / sizeof(struct reg_name))
150 static const struct reg_name cc_names
[] =
173 #define CC_NAME_CNT (sizeof(cc_names) / sizeof(struct reg_name))
175 /* reg_name_search does a binary search of the given register table
176 to see if "name" is a valid regiter name. Returns the register
177 number from the array on success, or -1 on failure. */
180 reg_name_search (regs
, regcount
, name
)
181 const struct reg_name
*regs
;
185 int middle
, low
, high
;
193 middle
= (low
+ high
) / 2;
194 cmp
= strcasecmp (name
, regs
[middle
].name
);
200 return regs
[middle
].value
;
207 /* Summary of register_name().
209 * in: Input_line_pointer points to 1st char of operand.
211 * out: A expressionS.
212 * The operand may have been a register: in this case, X_op == O_register,
213 * X_add_number is set to the register number, and truth is returned.
214 * Input_line_pointer->(next non-blank) char after operand, or is in
215 * its original state.
218 register_name (expressionP
)
219 expressionS
*expressionP
;
226 /* Find the spelling of the operand */
227 start
= name
= input_line_pointer
;
229 c
= get_symbol_end ();
230 reg_number
= reg_name_search (pre_defined_registers
, REG_NAME_CNT
, name
);
232 /* look to see if it's in the register table */
235 expressionP
->X_op
= O_register
;
236 expressionP
->X_add_number
= reg_number
;
238 /* make the rest nice */
239 expressionP
->X_add_symbol
= NULL
;
240 expressionP
->X_op_symbol
= NULL
;
241 *input_line_pointer
= c
; /* put back the delimiting char */
246 /* reset the line as if we had not done anything */
247 *input_line_pointer
= c
; /* put back the delimiting char */
248 input_line_pointer
= start
; /* reset input_line pointer */
253 /* Summary of system_register_name().
255 * in: Input_line_pointer points to 1st char of operand.
257 * out: A expressionS.
258 * The operand may have been a register: in this case, X_op == O_register,
259 * X_add_number is set to the register number, and truth is returned.
260 * Input_line_pointer->(next non-blank) char after operand, or is in
261 * its original state.
264 system_register_name (expressionP
)
265 expressionS
*expressionP
;
272 /* Find the spelling of the operand */
273 start
= name
= input_line_pointer
;
275 c
= get_symbol_end ();
276 reg_number
= reg_name_search (system_registers
, SYSREG_NAME_CNT
, name
);
278 /* look to see if it's in the register table */
281 expressionP
->X_op
= O_register
;
282 expressionP
->X_add_number
= reg_number
;
284 /* make the rest nice */
285 expressionP
->X_add_symbol
= NULL
;
286 expressionP
->X_op_symbol
= NULL
;
287 *input_line_pointer
= c
; /* put back the delimiting char */
292 /* reset the line as if we had not done anything */
293 *input_line_pointer
= c
; /* put back the delimiting char */
294 input_line_pointer
= start
; /* reset input_line pointer */
299 /* Summary of cc_name().
301 * in: Input_line_pointer points to 1st char of operand.
303 * out: A expressionS.
304 * The operand may have been a register: in this case, X_op == O_register,
305 * X_add_number is set to the register number, and truth is returned.
306 * Input_line_pointer->(next non-blank) char after operand, or is in
307 * its original state.
310 cc_name (expressionP
)
311 expressionS
*expressionP
;
318 /* Find the spelling of the operand */
319 start
= name
= input_line_pointer
;
321 c
= get_symbol_end ();
322 reg_number
= reg_name_search (cc_names
, CC_NAME_CNT
, name
);
324 /* look to see if it's in the register table */
327 expressionP
->X_op
= O_constant
;
328 expressionP
->X_add_number
= reg_number
;
330 /* make the rest nice */
331 expressionP
->X_add_symbol
= NULL
;
332 expressionP
->X_op_symbol
= NULL
;
333 *input_line_pointer
= c
; /* put back the delimiting char */
338 /* reset the line as if we had not done anything */
339 *input_line_pointer
= c
; /* put back the delimiting char */
340 input_line_pointer
= start
; /* reset input_line pointer */
346 md_show_usage (stream
)
349 fprintf(stream
, "V850 options:\n\
354 md_parse_option (c
, arg
)
362 md_undefined_symbol (name
)
369 md_atof (type
, litp
, sizep
)
375 LITTLENUM_TYPE words
[4];
391 return "bad call to md_atof";
394 t
= atof_ieee (input_line_pointer
, type
, words
);
396 input_line_pointer
= t
;
400 for (i
= prec
- 1; i
>= 0; i
--)
402 md_number_to_chars (litp
, (valueT
) words
[i
], 2);
411 md_convert_frag (abfd
, sec
, fragP
)
416 /* printf ("call to md_convert_frag \n"); */
421 md_section_align (seg
, addr
)
425 int align
= bfd_get_section_alignment (stdoutput
, seg
);
426 return ((addr
+ (1 << align
) - 1) & (-1 << align
));
432 char *prev_name
= "";
433 register const struct v850_opcode
*op
;
435 v850_hash
= hash_new();
437 /* Insert unique names into hash table. The V850 instruction set
438 has many identical opcode names that have different opcodes based
439 on the operands. This hash table then provides a quick index to
440 the first opcode with a particular name in the opcode table. */
445 if (strcmp (prev_name
, op
->name
))
447 prev_name
= (char *) op
->name
;
448 hash_insert (v850_hash
, op
->name
, (char *) op
);
454 static bfd_reloc_code_real_type
457 if (strncmp(input_line_pointer
, "hi0(", 4) == 0)
459 input_line_pointer
+= 4;
460 return BFD_RELOC_HI16
;
462 if (strncmp(input_line_pointer
, "hi(", 3) == 0)
464 input_line_pointer
+= 3;
465 return BFD_RELOC_HI16_S
;
467 if (strncmp (input_line_pointer
, "lo(", 3) == 0)
469 input_line_pointer
+= 3;
470 return BFD_RELOC_LO16
;
473 if (strncmp (input_line_pointer
, "sdaoff(", 7) == 0)
475 input_line_pointer
+= 7;
476 return BFD_RELOC_V850_SDA_OFFSET
;
479 if (strncmp (input_line_pointer
, "zdaoff(", 7) == 0)
481 input_line_pointer
+= 7;
482 return BFD_RELOC_V850_ZDA_OFFSET
;
485 if (strncmp (input_line_pointer
, "tdaoff(", 7) == 0)
487 input_line_pointer
+= 7;
488 return BFD_RELOC_V850_TDA_OFFSET
;
491 /* FIXME: implement sda, tda, zda here */
493 return BFD_RELOC_UNUSED
;
501 struct v850_opcode
*opcode
;
502 struct v850_opcode
*next_opcode
;
503 const unsigned char *opindex_ptr
;
505 unsigned long insn
, insn_size
;
509 bfd_reloc_code_real_type reloc
;
511 /* Get the opcode. */
512 for (s
= str
; *s
!= '\0' && ! isspace (*s
); s
++)
517 /* find the first opcode with the proper name */
518 opcode
= (struct v850_opcode
*)hash_find (v850_hash
, str
);
521 as_bad ("Unrecognized opcode: `%s'", str
);
526 while (isspace (*str
))
529 input_line_pointer
= str
;
533 const char *errmsg
= NULL
;
538 insn
= opcode
->opcode
;
539 for (opindex_ptr
= opcode
->operands
; *opindex_ptr
!= 0; opindex_ptr
++)
541 const struct v850_operand
*operand
;
545 if (next_opindex
== 0)
547 operand
= &v850_operands
[*opindex_ptr
];
551 operand
= &v850_operands
[next_opindex
];
557 while (*str
== ' ' || *str
== ',' || *str
== '[' || *str
== ']')
560 /* Gather the operand. */
561 hold
= input_line_pointer
;
562 input_line_pointer
= str
;
565 /* lo(), hi(), hi0(), etc... */
566 if ((reloc
= v850_reloc_prefix()) != BFD_RELOC_UNUSED
)
570 if (*input_line_pointer
++ != ')')
572 errmsg
= "syntax error: expected `)'";
576 if (ex
.X_op
== O_constant
)
581 ex
.X_add_number
&= 0xffff;
585 ex
.X_add_number
= ((ex
.X_add_number
>> 16) & 0xffff);
588 case BFD_RELOC_HI16_S
:
589 ex
.X_add_number
= ((ex
.X_add_number
>> 16) & 0xffff)
590 + ((ex
.X_add_number
>> 15) & 1);
597 insn
= v850_insert_operand (insn
, operand
, ex
.X_add_number
,
602 if (fc
> MAX_INSN_FIXUPS
)
603 as_fatal ("too many fixups");
606 fixups
[fc
].opindex
= *opindex_ptr
;
607 fixups
[fc
].reloc
= reloc
;
613 if ((operand
->flags
& V850_OPERAND_REG
) != 0)
615 if (!register_name(&ex
))
617 errmsg
= "invalid register name";
621 else if ((operand
->flags
& V850_OPERAND_SRG
) != 0)
623 if (!system_register_name(&ex
))
625 errmsg
= "invalid system register name";
629 else if ((operand
->flags
& V850_OPERAND_EP
) != 0)
631 char *start
= input_line_pointer
;
632 char c
= get_symbol_end ();
633 if (strcmp (start
, "ep") != 0 && strcmp (start
, "r30") != 0)
635 /* Put things back the way we found them. */
636 *input_line_pointer
= c
;
637 input_line_pointer
= start
;
638 errmsg
= "expected EP register";
641 *input_line_pointer
= c
;
642 str
= input_line_pointer
;
643 input_line_pointer
= hold
;
645 while (*str
== ' ' || *str
== ',' || *str
== '[' || *str
== ']')
649 else if ((operand
->flags
& V850_OPERAND_CC
) != 0)
653 errmsg
= "invalid condition code name";
657 else if (register_name (&ex
)
658 && (operand
->flags
& V850_OPERAND_REG
) == 0)
660 errmsg
= "syntax error: register not expected";
663 else if (system_register_name (&ex
)
664 && (operand
->flags
& V850_OPERAND_SRG
) == 0)
666 errmsg
= "syntax error: system register not expected";
669 else if (cc_name (&ex
)
670 && (operand
->flags
& V850_OPERAND_CC
) == 0)
672 errmsg
= "syntax error: condition code not expected";
683 errmsg
= "illegal operand";
686 errmsg
= "missing operand";
689 if ((operand
->flags
& (V850_OPERAND_REG
| V850_OPERAND_SRG
)) == 0)
691 errmsg
= "invalid operand";
695 insn
= v850_insert_operand (insn
, operand
, ex
.X_add_number
,
700 insn
= v850_insert_operand (insn
, operand
, ex
.X_add_number
,
705 /* We need to generate a fixup for this expression. */
706 if (fc
>= MAX_INSN_FIXUPS
)
707 as_fatal ("too many fixups");
709 fixups
[fc
].opindex
= *opindex_ptr
;
710 fixups
[fc
].reloc
= BFD_RELOC_UNUSED
;
717 str
= input_line_pointer
;
718 input_line_pointer
= hold
;
720 while (*str
== ' ' || *str
== ',' || *str
== '[' || *str
== ']')
728 next_opcode
= opcode
+ 1;
729 if (next_opcode
->opcode
!= 0 && !strcmp(next_opcode
->name
, opcode
->name
))
731 opcode
= next_opcode
;
735 as_bad ("%s", errmsg
);
741 while (isspace (*str
))
745 as_bad ("junk at end of line: `%s'", str
);
747 input_line_pointer
= str
;
749 /* Write out the instruction.
751 Four byte insns have an opcode with the two high bits on. */
752 if ((insn
& 0x0600) == 0x0600)
756 f
= frag_more (insn_size
);
757 md_number_to_chars (f
, insn
, insn_size
);
759 /* Create any fixups. At this point we do not use a
760 bfd_reloc_code_real_type, but instead just use the
761 BFD_RELOC_UNUSED plus the operand index. This lets us easily
762 handle fixups for any operand type, although that is admittedly
763 not a very exciting feature. We pick a BFD reloc type in
765 for (i
= 0; i
< fc
; i
++)
767 const struct v850_operand
*operand
;
769 operand
= &v850_operands
[fixups
[i
].opindex
];
770 if (fixups
[i
].reloc
!= BFD_RELOC_UNUSED
)
772 reloc_howto_type
*reloc_howto
= bfd_reloc_type_lookup (stdoutput
, fixups
[i
].reloc
);
780 size
= bfd_get_reloc_size (reloc_howto
);
782 /* The "size" of a TDA_OFFSET reloc varies depending
783 on what kind of instruction it's used in! */
784 if (reloc_howto
->type
== 11 && insn_size
> 2)
787 if (size
< 1 || size
> 4)
791 fixP
= fix_new_exp (frag_now
, f
- frag_now
->fr_literal
+ offset
, size
,
793 reloc_howto
->pc_relative
,
798 fix_new_exp (frag_now
, f
- frag_now
->fr_literal
, 4,
800 1 /* FIXME: V850_OPERAND_RELATIVE ??? */,
801 ((bfd_reloc_code_real_type
)
802 (fixups
[i
].opindex
+ (int) BFD_RELOC_UNUSED
)));
808 /* if while processing a fixup, a reloc really needs to be created */
809 /* then it is done here */
812 tc_gen_reloc (seg
, fixp
)
817 reloc
= (arelent
*) bfd_alloc_by_size_t (stdoutput
, sizeof (arelent
));
818 reloc
->sym_ptr_ptr
= &fixp
->fx_addsy
->bsym
;
819 reloc
->address
= fixp
->fx_frag
->fr_address
+ fixp
->fx_where
;
820 reloc
->howto
= bfd_reloc_type_lookup (stdoutput
, fixp
->fx_r_type
);
821 if (reloc
->howto
== (reloc_howto_type
*) NULL
)
823 as_bad_where (fixp
->fx_file
, fixp
->fx_line
,
824 "reloc %d not supported by object file format", (int)fixp
->fx_r_type
);
827 reloc
->addend
= fixp
->fx_addnumber
;
828 /* printf("tc_gen_reloc: addr=%x addend=%x\n", reloc->address, reloc->addend); */
833 md_estimate_size_before_relax (fragp
, seg
)
844 /* If the symbol is undefined, or in a section other than our own,
845 then let the linker figure it out. */
846 if (fixp
->fx_addsy
!= (symbolS
*) NULL
&& ! S_IS_DEFINED (fixp
->fx_addsy
))
848 /* The symbol is undefined. Let the linker figure it out. */
851 return fixp
->fx_frag
->fr_address
+ fixp
->fx_where
;
855 md_apply_fix3 (fixp
, valuep
, seg
)
863 if (fixp
->fx_addsy
== (symbolS
*) NULL
)
868 else if (fixp
->fx_pcrel
)
872 value
= fixp
->fx_offset
;
873 if (fixp
->fx_subsy
!= (symbolS
*) NULL
)
875 if (S_GET_SEGMENT (fixp
->fx_subsy
) == absolute_section
)
876 value
-= S_GET_VALUE (fixp
->fx_subsy
);
879 /* We don't actually support subtracting a symbol. */
880 as_bad_where (fixp
->fx_file
, fixp
->fx_line
,
881 "expression too complex");
886 /* printf("md_apply_fix: value=0x%x type=%d\n", value, fixp->fx_r_type); */
888 if ((int) fixp
->fx_r_type
>= (int) BFD_RELOC_UNUSED
)
891 const struct v850_operand
*operand
;
895 opindex
= (int) fixp
->fx_r_type
- (int) BFD_RELOC_UNUSED
;
896 operand
= &v850_operands
[opindex
];
898 /* Fetch the instruction, insert the fully resolved operand
899 value, and stuff the instruction back again.
901 Note the instruction has been stored in little endian
903 where
= fixp
->fx_frag
->fr_literal
+ fixp
->fx_where
;
905 insn
= bfd_getl32((unsigned char *) where
);
906 insn
= v850_insert_operand (insn
, operand
, (offsetT
) value
,
907 fixp
->fx_file
, fixp
->fx_line
);
908 bfd_putl32((bfd_vma
) insn
, (unsigned char *) where
);
912 /* Nothing else to do here. */
916 /* Determine a BFD reloc value based on the operand information.
917 We are only prepared to turn a few of the operands into relocs. */
919 if (operand
->bits
== 22)
920 fixp
->fx_r_type
= BFD_RELOC_V850_22_PCREL
;
921 else if (operand
->bits
== 9)
922 fixp
->fx_r_type
= BFD_RELOC_V850_9_PCREL
;
925 as_bad_where(fixp
->fx_file
, fixp
->fx_line
,
926 "unresolved expression that must be resolved");
931 else if (fixp
->fx_done
)
933 /* We still have to insert the value into memory! */
934 where
= fixp
->fx_frag
->fr_literal
+ fixp
->fx_where
;
935 if (fixp
->fx_size
== 1)
936 *where
= value
& 0xff;
937 if (fixp
->fx_size
== 2)
938 bfd_putl16(value
& 0xffff, (unsigned char *) where
);
939 if (fixp
->fx_size
== 4)
940 bfd_putl32(value
, (unsigned char *) where
);
943 fixp
->fx_addnumber
= value
;
948 /* Insert an operand value into an instruction. */
951 v850_insert_operand (insn
, operand
, val
, file
, line
)
953 const struct v850_operand
*operand
;
958 if (operand
->bits
!= 16)
963 if ((operand
->flags
& V850_OPERAND_SIGNED
) != 0)
965 max
= (1 << (operand
->bits
- 1)) - 1;
966 min
= - (1 << (operand
->bits
- 1));
970 max
= (1 << operand
->bits
) - 1;
977 if (test
< (offsetT
) min
|| test
> (offsetT
) max
)
980 "operand out of range (%s not between %ld and %ld)";
983 sprint_value (buf
, test
);
984 if (file
== (char *) NULL
)
985 as_warn (err
, buf
, min
, max
);
987 as_warn_where (file
, line
, err
, buf
, min
, max
);
993 const char *message
= NULL
;
994 insn
= (*operand
->insert
) (insn
, val
, &message
);
997 if (file
== (char *) NULL
)
1000 as_warn_where (file
, line
, message
);
1004 insn
|= (((long) val
& ((1 << operand
->bits
) - 1)) << operand
->shift
);