1999-09-12 Donn Terry <donn@interix.com>
[binutils.git] / opcodes / arc-dis.c
blob802b07b9521899d357fc75cba19934b0ac26c438
1 /* Instruction printing code for the ARC.
2 Copyright (C) 1994, 1995, 1997, 1998 Free Software Foundation, Inc.
3 Contributed by Doug Evans (dje@cygnus.com).
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19 #include "dis-asm.h"
20 #include "opcode/arc.h"
21 #include "elf-bfd.h"
22 #include "elf/arc.h"
23 #include "opintl.h"
25 static int print_insn_arc_base_little PARAMS ((bfd_vma, disassemble_info *));
26 static int print_insn_arc_base_big PARAMS ((bfd_vma, disassemble_info *));
28 static int print_insn PARAMS ((bfd_vma, disassemble_info *, int, int));
30 /* Print one instruction from PC on INFO->STREAM.
31 Return the size of the instruction (4 or 8 for the ARC). */
33 static int
34 print_insn (pc, info, mach, big_p)
35 bfd_vma pc;
36 disassemble_info *info;
37 int mach;
38 int big_p;
40 const struct arc_opcode *opcode;
41 bfd_byte buffer[4];
42 void *stream = info->stream;
43 fprintf_ftype func = info->fprintf_func;
44 int status;
45 /* First element is insn, second element is limm (if present). */
46 arc_insn insn[2];
47 int got_limm_p = 0;
48 static int initialized = 0;
49 static int current_mach = 0;
51 if (!initialized || mach != current_mach)
53 initialized = 1;
54 current_mach = arc_get_opcode_mach (mach, big_p);
55 arc_opcode_init_tables (current_mach);
58 status = (*info->read_memory_func) (pc, buffer, 4, info);
59 if (status != 0)
61 (*info->memory_error_func) (status, pc, info);
62 return -1;
64 if (big_p)
65 insn[0] = bfd_getb32 (buffer);
66 else
67 insn[0] = bfd_getl32 (buffer);
69 (*func) (stream, "%08lx\t", insn[0]);
71 /* The instructions are stored in lists hashed by the insn code
72 (though we needn't care how they're hashed). */
74 opcode = arc_opcode_lookup_dis (insn[0]);
75 for ( ; opcode != NULL; opcode = ARC_OPCODE_NEXT_DIS (opcode))
77 char *syn;
78 int mods,invalid;
79 long value;
80 const struct arc_operand *operand;
81 const struct arc_operand_value *opval;
83 /* Basic bit mask must be correct. */
84 if ((insn[0] & opcode->mask) != opcode->value)
85 continue;
87 /* Supported by this cpu? */
88 if (! arc_opcode_supported (opcode))
89 continue;
91 /* Make two passes over the operands. First see if any of them
92 have extraction functions, and, if they do, make sure the
93 instruction is valid. */
95 arc_opcode_init_extract ();
96 invalid = 0;
98 /* ??? Granted, this is slower than the `ppc' way. Maybe when this is
99 done it'll be clear what the right way to do this is. */
100 /* Instructions like "add.f r0,r1,1" are tricky because the ".f" gets
101 printed first, but we don't know how to print it until we've processed
102 the regs. Since we're scanning all the args before printing the insn
103 anyways, it's actually quite easy. */
105 for (syn = opcode->syntax; *syn; ++syn)
107 int c;
109 if (*syn != '%' || *++syn == '%')
110 continue;
111 mods = 0;
112 c = *syn;
113 while (ARC_MOD_P (arc_operands[arc_operand_map[c]].flags))
115 mods |= arc_operands[arc_operand_map[c]].flags & ARC_MOD_BITS;
116 ++syn;
117 c = *syn;
119 operand = arc_operands + arc_operand_map[c];
120 if (operand->extract)
121 (*operand->extract) (insn, operand, mods,
122 (const struct arc_operand_value **) NULL,
123 &invalid);
125 if (invalid)
126 continue;
128 /* The instruction is valid. */
130 /* If we have an insn with a limm, fetch it now. Scanning the insns
131 twice lets us do this. */
132 if (arc_opcode_limm_p (NULL))
134 status = (*info->read_memory_func) (pc + 4, buffer, 4, info);
135 if (status != 0)
137 (*info->memory_error_func) (status, pc, info);
138 return -1;
140 if (big_p)
141 insn[1] = bfd_getb32 (buffer);
142 else
143 insn[1] = bfd_getl32 (buffer);
144 got_limm_p = 1;
147 for (syn = opcode->syntax; *syn; ++syn)
149 int c;
151 if (*syn != '%' || *++syn == '%')
153 (*func) (stream, "%c", *syn);
154 continue;
157 /* We have an operand. Fetch any special modifiers. */
158 mods = 0;
159 c = *syn;
160 while (ARC_MOD_P (arc_operands[arc_operand_map[c]].flags))
162 mods |= arc_operands[arc_operand_map[c]].flags & ARC_MOD_BITS;
163 ++syn;
164 c = *syn;
166 operand = arc_operands + arc_operand_map[c];
168 /* Extract the value from the instruction. */
169 opval = NULL;
170 if (operand->extract)
172 value = (*operand->extract) (insn, operand, mods,
173 &opval, (int *) NULL);
175 else
177 value = (insn[0] >> operand->shift) & ((1 << operand->bits) - 1);
178 if ((operand->flags & ARC_OPERAND_SIGNED)
179 && (value & (1 << (operand->bits - 1))))
180 value -= 1 << operand->bits;
182 /* If this is a suffix operand, set `opval'. */
183 if (operand->flags & ARC_OPERAND_SUFFIX)
184 opval = arc_opcode_lookup_suffix (operand, value);
187 /* Print the operand as directed by the flags. */
188 if (operand->flags & ARC_OPERAND_FAKE)
189 ; /* nothing to do (??? at least not yet) */
190 else if (operand->flags & ARC_OPERAND_SUFFIX)
192 /* Default suffixes aren't printed. Fortunately, they all have
193 zero values. Also, zero values for boolean suffixes are
194 represented by the absence of text. */
196 if (value != 0)
198 /* ??? OPVAL should have a value. If it doesn't just cope
199 as we want disassembly to be reasonably robust.
200 Also remember that several condition code values (16-31)
201 aren't defined yet. For these cases just print the
202 number suitably decorated. */
203 if (opval)
204 (*func) (stream, "%s%s",
205 mods & ARC_MOD_DOT ? "." : "",
206 opval->name);
207 else
208 (*func) (stream, "%s%c%d",
209 mods & ARC_MOD_DOT ? "." : "",
210 operand->fmt, value);
213 else if (operand->flags & ARC_OPERAND_RELATIVE_BRANCH)
214 (*info->print_address_func) (pc + 4 + value, info);
215 /* ??? Not all cases of this are currently caught. */
216 else if (operand->flags & ARC_OPERAND_ABSOLUTE_BRANCH)
217 (*info->print_address_func) ((bfd_vma) value & 0xffffffff, info);
218 else if (operand->flags & ARC_OPERAND_ADDRESS)
219 (*info->print_address_func) ((bfd_vma) value & 0xffffffff, info);
220 else if (opval)
221 /* Note that this case catches both normal and auxiliary regs. */
222 (*func) (stream, "%s", opval->name);
223 else
224 (*func) (stream, "%ld", value);
227 /* We have found and printed an instruction; return. */
228 return got_limm_p ? 8 : 4;
231 (*func) (stream, _("*unknown*"));
232 return 4;
235 /* Given MACH, one of bfd_mach_arc_xxx, return the print_insn function to use.
236 This does things a non-standard way (the "standard" way would be to copy
237 this code into disassemble.c). Since there are more than a couple of
238 variants, hiding all this crud here seems cleaner. */
240 disassembler_ftype
241 arc_get_disassembler (mach, big_p)
242 int mach;
243 int big_p;
245 switch (mach)
247 case bfd_mach_arc_base:
248 return big_p ? print_insn_arc_base_big : print_insn_arc_base_little;
250 return print_insn_arc_base_little;
253 static int
254 print_insn_arc_base_little (pc, info)
255 bfd_vma pc;
256 disassemble_info *info;
258 return print_insn (pc, info, bfd_mach_arc_base, 0);
261 static int
262 print_insn_arc_base_big (pc, info)
263 bfd_vma pc;
264 disassemble_info *info;
266 return print_insn (pc, info, bfd_mach_arc_base, 1);