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
[] =
90 /* Opcode hash table. */
91 static struct hash_control
*v850_hash
;
93 /* This table is sorted. Suitable for searching by a binary search. */
94 static const struct reg_name pre_defined_registers
[] =
96 { "ep", 30 }, /* ep - element ptr */
97 { "gp", 4 }, /* gp - global ptr */
98 { "lp", 31 }, /* lp - link ptr */
131 { "sp", 3 }, /* sp - stack ptr */
132 { "tp", 5 }, /* tp - text ptr */
135 #define REG_NAME_CNT (sizeof(pre_defined_registers) / sizeof(struct reg_name))
138 static const struct reg_name system_registers
[] =
147 #define SYSREG_NAME_CNT (sizeof(system_registers) / sizeof(struct reg_name))
149 static const struct reg_name cc_names
[] =
172 #define CC_NAME_CNT (sizeof(cc_names) / sizeof(struct reg_name))
174 /* reg_name_search does a binary search of the given register table
175 to see if "name" is a valid regiter name. Returns the register
176 number from the array on success, or -1 on failure. */
179 reg_name_search (regs
, regcount
, name
)
180 const struct reg_name
*regs
;
184 int middle
, low
, high
;
192 middle
= (low
+ high
) / 2;
193 cmp
= strcasecmp (name
, regs
[middle
].name
);
199 return regs
[middle
].value
;
206 /* Summary of register_name().
208 * in: Input_line_pointer points to 1st char of operand.
210 * out: A expressionS.
211 * The operand may have been a register: in this case, X_op == O_register,
212 * X_add_number is set to the register number, and truth is returned.
213 * Input_line_pointer->(next non-blank) char after operand, or is in
214 * its original state.
217 register_name (expressionP
)
218 expressionS
*expressionP
;
225 /* Find the spelling of the operand */
226 start
= name
= input_line_pointer
;
228 c
= get_symbol_end ();
229 reg_number
= reg_name_search (pre_defined_registers
, REG_NAME_CNT
, name
);
231 /* look to see if it's in the register table */
234 expressionP
->X_op
= O_register
;
235 expressionP
->X_add_number
= reg_number
;
237 /* make the rest nice */
238 expressionP
->X_add_symbol
= NULL
;
239 expressionP
->X_op_symbol
= NULL
;
240 *input_line_pointer
= c
; /* put back the delimiting char */
245 /* reset the line as if we had not done anything */
246 *input_line_pointer
= c
; /* put back the delimiting char */
247 input_line_pointer
= start
; /* reset input_line pointer */
252 /* Summary of system_register_name().
254 * in: Input_line_pointer points to 1st char of operand.
256 * out: A expressionS.
257 * The operand may have been a register: in this case, X_op == O_register,
258 * X_add_number is set to the register number, and truth is returned.
259 * Input_line_pointer->(next non-blank) char after operand, or is in
260 * its original state.
263 system_register_name (expressionP
)
264 expressionS
*expressionP
;
271 /* Find the spelling of the operand */
272 start
= name
= input_line_pointer
;
274 c
= get_symbol_end ();
275 reg_number
= reg_name_search (system_registers
, SYSREG_NAME_CNT
, name
);
277 /* look to see if it's in the register table */
280 expressionP
->X_op
= O_register
;
281 expressionP
->X_add_number
= reg_number
;
283 /* make the rest nice */
284 expressionP
->X_add_symbol
= NULL
;
285 expressionP
->X_op_symbol
= NULL
;
286 *input_line_pointer
= c
; /* put back the delimiting char */
291 /* reset the line as if we had not done anything */
292 *input_line_pointer
= c
; /* put back the delimiting char */
293 input_line_pointer
= start
; /* reset input_line pointer */
298 /* Summary of cc_name().
300 * in: Input_line_pointer points to 1st char of operand.
302 * out: A expressionS.
303 * The operand may have been a register: in this case, X_op == O_register,
304 * X_add_number is set to the register number, and truth is returned.
305 * Input_line_pointer->(next non-blank) char after operand, or is in
306 * its original state.
309 cc_name (expressionP
)
310 expressionS
*expressionP
;
317 /* Find the spelling of the operand */
318 start
= name
= input_line_pointer
;
320 c
= get_symbol_end ();
321 reg_number
= reg_name_search (cc_names
, CC_NAME_CNT
, name
);
323 /* look to see if it's in the register table */
326 expressionP
->X_op
= O_constant
;
327 expressionP
->X_add_number
= reg_number
;
329 /* make the rest nice */
330 expressionP
->X_add_symbol
= NULL
;
331 expressionP
->X_op_symbol
= NULL
;
332 *input_line_pointer
= c
; /* put back the delimiting char */
337 /* reset the line as if we had not done anything */
338 *input_line_pointer
= c
; /* put back the delimiting char */
339 input_line_pointer
= start
; /* reset input_line pointer */
345 md_show_usage (stream
)
348 fprintf(stream
, "V850 options:\n\
353 md_parse_option (c
, arg
)
361 md_undefined_symbol (name
)
368 md_atof (type
, litp
, sizep
)
374 LITTLENUM_TYPE words
[4];
390 return "bad call to md_atof";
393 t
= atof_ieee (input_line_pointer
, type
, words
);
395 input_line_pointer
= t
;
399 for (i
= prec
- 1; i
>= 0; i
--)
401 md_number_to_chars (litp
, (valueT
) words
[i
], 2);
410 md_convert_frag (abfd
, sec
, fragP
)
415 /* printf ("call to md_convert_frag \n"); */
420 md_section_align (seg
, addr
)
424 int align
= bfd_get_section_alignment (stdoutput
, seg
);
425 return ((addr
+ (1 << align
) - 1) & (-1 << align
));
431 char *prev_name
= "";
432 register const struct v850_opcode
*op
;
434 v850_hash
= hash_new();
436 /* Insert unique names into hash table. The V850 instruction set
437 has many identical opcode names that have different opcodes based
438 on the operands. This hash table then provides a quick index to
439 the first opcode with a particular name in the opcode table. */
444 if (strcmp (prev_name
, op
->name
))
446 prev_name
= (char *) op
->name
;
447 hash_insert (v850_hash
, op
->name
, (char *) op
);
453 static bfd_reloc_code_real_type
456 if (strncmp(input_line_pointer
, "hi0(", 4) == 0)
458 input_line_pointer
+= 4;
459 return BFD_RELOC_HI16
;
461 if (strncmp(input_line_pointer
, "hi(", 3) == 0)
463 input_line_pointer
+= 3;
464 return BFD_RELOC_HI16_S
;
466 if (strncmp (input_line_pointer
, "lo(", 3) == 0)
468 input_line_pointer
+= 3;
469 return BFD_RELOC_LO16
;
472 if (strncmp (input_line_pointer
, "sdaoff(", 7) == 0)
474 input_line_pointer
+= 7;
475 return BFD_RELOC_V850_SDA_OFFSET
;
478 if (strncmp (input_line_pointer
, "zdaoff(", 7) == 0)
480 input_line_pointer
+= 7;
481 return BFD_RELOC_V850_ZDA_OFFSET
;
484 if (strncmp (input_line_pointer
, "tdaoff(", 7) == 0)
486 input_line_pointer
+= 7;
487 return BFD_RELOC_V850_TDA_OFFSET
;
490 /* FIXME: implement sda, tda, zda here */
492 return BFD_RELOC_UNUSED
;
500 struct v850_opcode
*opcode
;
501 struct v850_opcode
*next_opcode
;
502 const unsigned char *opindex_ptr
;
504 unsigned long insn
, size
;
508 bfd_reloc_code_real_type reloc
;
510 /* Get the opcode. */
511 for (s
= str
; *s
!= '\0' && ! isspace (*s
); s
++)
516 /* find the first opcode with the proper name */
517 opcode
= (struct v850_opcode
*)hash_find (v850_hash
, str
);
520 as_bad ("Unrecognized opcode: `%s'", str
);
525 while (isspace (*str
))
528 input_line_pointer
= str
;
532 const char *errmsg
= NULL
;
537 insn
= opcode
->opcode
;
538 for (opindex_ptr
= opcode
->operands
; *opindex_ptr
!= 0; opindex_ptr
++)
540 const struct v850_operand
*operand
;
544 if (next_opindex
== 0)
546 operand
= &v850_operands
[*opindex_ptr
];
550 operand
= &v850_operands
[next_opindex
];
556 while (*str
== ' ' || *str
== ',' || *str
== '[' || *str
== ']')
559 /* Gather the operand. */
560 hold
= input_line_pointer
;
561 input_line_pointer
= str
;
564 /* lo(), hi(), hi0(), etc... */
565 if ((reloc
= v850_reloc_prefix()) != BFD_RELOC_UNUSED
)
569 if (*input_line_pointer
++ != ')')
571 errmsg
= "syntax error: expected `)'";
575 if (ex
.X_op
== O_constant
)
580 ex
.X_add_number
&= 0xffff;
584 ex
.X_add_number
= ((ex
.X_add_number
>> 16) & 0xffff);
587 case BFD_RELOC_HI16_S
:
588 ex
.X_add_number
= ((ex
.X_add_number
>> 16) & 0xffff)
589 + ((ex
.X_add_number
>> 15) & 1);
596 insn
= v850_insert_operand (insn
, operand
, ex
.X_add_number
,
601 if (fc
> MAX_INSN_FIXUPS
)
602 as_fatal ("too many fixups");
605 fixups
[fc
].opindex
= *opindex_ptr
;
606 fixups
[fc
].reloc
= reloc
;
612 if ((operand
->flags
& V850_OPERAND_REG
) != 0)
614 if (!register_name(&ex
))
616 errmsg
= "invalid register name";
620 else if ((operand
->flags
& V850_OPERAND_SRG
) != 0)
622 if (!system_register_name(&ex
))
624 errmsg
= "invalid system register name";
628 else if ((operand
->flags
& V850_OPERAND_EP
) != 0)
630 char *start
= input_line_pointer
;
631 char c
= get_symbol_end ();
632 if (strcmp (start
, "ep") != 0 && strcmp (start
, "r30") != 0)
634 /* Put things back the way we found them. */
635 *input_line_pointer
= c
;
636 input_line_pointer
= start
;
637 errmsg
= "expected EP register";
640 *input_line_pointer
= c
;
641 str
= input_line_pointer
;
642 input_line_pointer
= hold
;
644 while (*str
== ' ' || *str
== ',' || *str
== '[' || *str
== ']')
648 else if ((operand
->flags
& V850_OPERAND_CC
) != 0)
652 errmsg
= "invalid condition code name";
656 else if (register_name (&ex
)
657 && (operand
->flags
& V850_OPERAND_REG
) == 0)
659 errmsg
= "syntax error: register not expected";
662 else if (system_register_name (&ex
)
663 && (operand
->flags
& V850_OPERAND_SRG
) == 0)
665 errmsg
= "syntax error: system register not expected";
668 else if (cc_name (&ex
)
669 && (operand
->flags
& V850_OPERAND_CC
) == 0)
671 errmsg
= "syntax error: condition code not expected";
682 errmsg
= "illegal operand";
685 errmsg
= "missing operand";
688 if ((operand
->flags
& (V850_OPERAND_REG
| V850_OPERAND_SRG
)) == 0)
690 errmsg
= "invalid operand";
694 insn
= v850_insert_operand (insn
, operand
, ex
.X_add_number
,
699 insn
= v850_insert_operand (insn
, operand
, ex
.X_add_number
,
704 /* We need to generate a fixup for this expression. */
705 if (fc
>= MAX_INSN_FIXUPS
)
706 as_fatal ("too many fixups");
708 fixups
[fc
].opindex
= *opindex_ptr
;
709 fixups
[fc
].reloc
= BFD_RELOC_UNUSED
;
716 str
= input_line_pointer
;
717 input_line_pointer
= hold
;
719 while (*str
== ' ' || *str
== ',' || *str
== '[' || *str
== ']')
727 next_opcode
= opcode
+ 1;
728 if (next_opcode
->opcode
!= 0 && !strcmp(next_opcode
->name
, opcode
->name
))
730 opcode
= next_opcode
;
734 as_bad ("%s", errmsg
);
740 while (isspace (*str
))
744 as_bad ("junk at end of line: `%s'", str
);
746 input_line_pointer
= str
;
748 /* Write out the instruction.
750 Four byte insns have an opcode with the two high bits on. */
751 if ((insn
& 0x0600) == 0x0600)
755 f
= frag_more (size
);
756 md_number_to_chars (f
, insn
, size
);
758 /* Create any fixups. At this point we do not use a
759 bfd_reloc_code_real_type, but instead just use the
760 BFD_RELOC_UNUSED plus the operand index. This lets us easily
761 handle fixups for any operand type, although that is admittedly
762 not a very exciting feature. We pick a BFD reloc type in
764 for (i
= 0; i
< fc
; i
++)
766 const struct v850_operand
*operand
;
768 operand
= &v850_operands
[fixups
[i
].opindex
];
769 if (fixups
[i
].reloc
!= BFD_RELOC_UNUSED
)
771 reloc_howto_type
*reloc_howto
= bfd_reloc_type_lookup (stdoutput
, fixups
[i
].reloc
);
779 size
= bfd_get_reloc_size (reloc_howto
);
782 if (size
< 1 || size
> 4)
785 fixP
= fix_new_exp (frag_now
, f
- frag_now
->fr_literal
+ offset
, size
,
787 reloc_howto
->pc_relative
,
792 fix_new_exp (frag_now
, f
- frag_now
->fr_literal
, 4,
794 1 /* FIXME: V850_OPERAND_RELATIVE ??? */,
795 ((bfd_reloc_code_real_type
)
796 (fixups
[i
].opindex
+ (int) BFD_RELOC_UNUSED
)));
802 /* if while processing a fixup, a reloc really needs to be created */
803 /* then it is done here */
806 tc_gen_reloc (seg
, fixp
)
811 reloc
= (arelent
*) bfd_alloc_by_size_t (stdoutput
, sizeof (arelent
));
812 reloc
->sym_ptr_ptr
= &fixp
->fx_addsy
->bsym
;
813 reloc
->address
= fixp
->fx_frag
->fr_address
+ fixp
->fx_where
;
814 reloc
->howto
= bfd_reloc_type_lookup (stdoutput
, fixp
->fx_r_type
);
815 if (reloc
->howto
== (reloc_howto_type
*) NULL
)
817 as_bad_where (fixp
->fx_file
, fixp
->fx_line
,
818 "reloc %d not supported by object file format", (int)fixp
->fx_r_type
);
821 reloc
->addend
= fixp
->fx_addnumber
;
822 /* printf("tc_gen_reloc: addr=%x addend=%x\n", reloc->address, reloc->addend); */
827 md_estimate_size_before_relax (fragp
, seg
)
838 /* If the symbol is undefined, or in a section other than our own,
839 then let the linker figure it out. */
840 if (fixp
->fx_addsy
!= (symbolS
*) NULL
&& ! S_IS_DEFINED (fixp
->fx_addsy
))
842 /* The symbol is undefined. Let the linker figure it out. */
845 return fixp
->fx_frag
->fr_address
+ fixp
->fx_where
;
849 md_apply_fix3 (fixp
, valuep
, seg
)
857 if (fixp
->fx_addsy
== (symbolS
*) NULL
)
862 else if (fixp
->fx_pcrel
)
866 value
= fixp
->fx_offset
;
867 if (fixp
->fx_subsy
!= (symbolS
*) NULL
)
869 if (S_GET_SEGMENT (fixp
->fx_subsy
) == absolute_section
)
870 value
-= S_GET_VALUE (fixp
->fx_subsy
);
873 /* We don't actually support subtracting a symbol. */
874 as_bad_where (fixp
->fx_file
, fixp
->fx_line
,
875 "expression too complex");
880 /* printf("md_apply_fix: value=0x%x type=%d\n", value, fixp->fx_r_type); */
882 if ((int) fixp
->fx_r_type
>= (int) BFD_RELOC_UNUSED
)
885 const struct v850_operand
*operand
;
889 opindex
= (int) fixp
->fx_r_type
- (int) BFD_RELOC_UNUSED
;
890 operand
= &v850_operands
[opindex
];
892 /* Fetch the instruction, insert the fully resolved operand
893 value, and stuff the instruction back again.
895 Note the instruction has been stored in little endian
897 where
= fixp
->fx_frag
->fr_literal
+ fixp
->fx_where
;
899 insn
= bfd_getl32((unsigned char *) where
);
900 insn
= v850_insert_operand (insn
, operand
, (offsetT
) value
,
901 fixp
->fx_file
, fixp
->fx_line
);
902 bfd_putl32((bfd_vma
) insn
, (unsigned char *) where
);
906 /* Nothing else to do here. */
910 /* Determine a BFD reloc value based on the operand information.
911 We are only prepared to turn a few of the operands into relocs. */
913 if (operand
->bits
== 22)
914 fixp
->fx_r_type
= BFD_RELOC_V850_22_PCREL
;
915 else if (operand
->bits
== 9)
916 fixp
->fx_r_type
= BFD_RELOC_V850_9_PCREL
;
919 as_bad_where(fixp
->fx_file
, fixp
->fx_line
,
920 "unresolved expression that must be resolved");
925 else if (fixp
->fx_done
)
927 /* We still have to insert the value into memory! */
928 where
= fixp
->fx_frag
->fr_literal
+ fixp
->fx_where
;
929 if (fixp
->fx_size
== 1)
930 *where
= value
& 0xff;
931 if (fixp
->fx_size
== 2)
932 bfd_putl16(value
& 0xffff, (unsigned char *) where
);
933 if (fixp
->fx_size
== 4)
934 bfd_putl32(value
, (unsigned char *) where
);
937 fixp
->fx_addnumber
= value
;
942 /* Insert an operand value into an instruction. */
945 v850_insert_operand (insn
, operand
, val
, file
, line
)
947 const struct v850_operand
*operand
;
952 if (operand
->bits
!= 16)
957 if ((operand
->flags
& V850_OPERAND_SIGNED
) != 0)
959 max
= (1 << (operand
->bits
- 1)) - 1;
960 min
= - (1 << (operand
->bits
- 1));
964 max
= (1 << operand
->bits
) - 1;
971 if (test
< (offsetT
) min
|| test
> (offsetT
) max
)
974 "operand out of range (%s not between %ld and %ld)";
977 sprint_value (buf
, test
);
978 if (file
== (char *) NULL
)
979 as_warn (err
, buf
, min
, max
);
981 as_warn_where (file
, line
, err
, buf
, min
, max
);
987 const char *message
= NULL
;
988 insn
= (*operand
->insert
) (insn
, val
, &message
);
991 if (file
== (char *) NULL
)
994 as_warn_where (file
, line
, message
);
998 insn
|= (((long) val
& ((1 << operand
->bits
) - 1)) << operand
->shift
);