[deliverable/binutils-gdb.git] / gdb / m88k-pinsn.c

/* Print instructions for the Motorola 88000, for GDB and GNU Binutils.
   Copyright 1986, 1987, 1988, 1989, 1990, 1991 Free Software Foundation, Inc.
   Contributed by Data General Corporation, November 1989.
   Partially derived from an earlier printcmd.c.

This file is part of GDB and the GNU Binutils.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include "opcode/m88k.h"
#include "symtab.h"

void sprint_address ();

INSTAB  *hashtable[HASHVAL] = {0};

/*
*		Disassemble an M88000 Instruction
*
*
*       This module decodes the first instruction in inbuf.  It uses the pc
*	to display pc-relative displacements.  It writes the disassembled
*	instruction in outbuf.
*
*			Revision History
*
*       Revision 1.0    11/08/85        Creation date by Motorola
*			05/11/89	R. Trawick adapted to GDB interface.
*/
#define MAXLEN 20

print_insn (memaddr, stream)
     CORE_ADDR memaddr;
     FILE *stream;
{
  unsigned char buffer[MAXLEN];
  /* should be expanded if disassembler prints symbol names */
  char outbuf[100];
  int n;

  /* Instruction addresses may have low two bits set. Clear them.	*/
  memaddr&= 0xfffffffc;
  read_memory (memaddr, buffer, MAXLEN);

  n = m88kdis ((int)memaddr, buffer, outbuf);

  fputs (outbuf, stream);

  return (n);
}

/*
 * disassemble the first instruction in 'inbuf'.
 * 'pc' should be the address of this instruction, it will
 *   be used to print the target address if this is a relative jump or call
 * 'outbuf' gets filled in with the disassembled instruction.  It should
 *   be long enough to hold the longest disassembled instruction.
 *   100 bytes is certainly enough, unless symbol printing is added later
 * The function returns the length of this instruction in bytes.
 */

int m88kdis( pc, inbuf, outbuf )

    int		pc;
    int	        *inbuf;
    char	*outbuf;

{   static		ihashtab_initialized = 0;
    int			instruction;
    unsigned int	opcode;
    INSTAB		*entry_ptr;
    int	        	opmask;
    int			class;

    instruction= *inbuf;

    if (!ihashtab_initialized) {
	init_disasm();
    }

    /* create a the appropriate mask to isolate the opcode */
    opmask= DEFMASK;
    class= instruction & DEFMASK;
    if ((class >= SFU0) && (class <= SFU7)) {
	if (instruction < SFU1) {
	    opmask= CTRLMASK;
	} else {
	    opmask= SFUMASK;
	}
    } else if (class == RRR) {
	opmask= RRRMASK;
    } else if (class == RRI10) {
	opmask= RRI10MASK;
    }

    /* isolate the opcode */
    opcode= instruction & opmask;

    /* search the hash table with the isolated opcode */
    for (entry_ptr= hashtable[ opcode % HASHVAL ];
	 (entry_ptr != NULL) && (entry_ptr->opcode != opcode);
	 entry_ptr= entry_ptr->next) {
    }

    if (entry_ptr == NULL) {
	sprintf( outbuf, "word\t%08x", instruction );
    } else {
	sprintf( outbuf, "%s\t", entry_ptr->mnemonic );
	sprintop( &outbuf[strlen(outbuf)], &(entry_ptr->op1), instruction, pc, 1 );
	sprintop( &outbuf[strlen(outbuf)], &(entry_ptr->op2), instruction, pc, 0 );
	sprintop( &outbuf[strlen(outbuf)], &(entry_ptr->op3), instruction, pc, 0 );
    }


    return 4;
}
\f

/*
*                      Decode an Operand of an Instruction
*
*			Functional Description
*
*       This module formats and writes an operand of an instruction to buf
*       based on the operand specification.  When the first flag is set this
*       is the first operand of an instruction.  Undefined operand types
*       cause a <dis error> message.
*
*			Parameters
*	char	*buf		buffer where the operand may be printed
*       OPSPEC  *opptr          Pointer to an operand specification
*       UINT    inst            Instruction from which operand is extracted
*	UINT    pc		PC of instruction; used for pc-relative disp.
*       int     first           Flag which if nonzero indicates the first
*                               operand of an instruction
*
*			Output
*
*       The operand specified is extracted from the instruction and is
*       written to buf in the format specified. The operand is preceded
*       by a comma if it is not the first operand of an instruction and it
*       is not a register indirect form.  Registers are preceded by 'r' and
*       hex values by '0x'.
*
*			Revision History
*
*       Revision 1.0    11/08/85        Creation date
*/

sprintop( buf, opptr, inst, pc, first )

   char   *buf;
   OPSPEC *opptr;
   UINT   inst;
   int	  pc;
   int    first;

{  int	  extracted_field;
   char	  *cond_mask_sym;
   char	  cond_mask_sym_buf[6];

   if (opptr->width == 0)
      return;

   switch(opptr->type) {
      case CRREG:
		       if (!first)
			   *buf++= ',';
		       sprintf( buf, "cr%d", UEXT(inst,opptr->offset,opptr->width));
		       break;

      case FCRREG:
		       if (!first)
			   *buf++= ',';
		       sprintf( buf, "fcr%d", UEXT(inst,opptr->offset,opptr->width));
		       break;

      case REGSC:
		       sprintf( buf, "[r%d]", UEXT(inst,opptr->offset,opptr->width));
		       break;

      case REG:
		       if (!first)
			   *buf++= ',';
		       sprintf( buf, "r%d", UEXT(inst,opptr->offset,opptr->width));
		       break;

      case HEX:
		        if (!first)
			   *buf++= ',';
		        extracted_field= UEXT(inst, opptr->offset, opptr->width);
		        if (extracted_field == 0) {
			    sprintf( buf, "0" );
		        } else {
			    sprintf( buf, "0x%02x", extracted_field );
		        }
		        break;

      case CONDMASK:
		        if (!first)
			   *buf++= ',';
		        extracted_field= UEXT(inst, opptr->offset, opptr->width);
		        switch (extracted_field & 0x0f) {
			  case 0x1:	cond_mask_sym= "gt0";
					break;
			  case 0x2:	cond_mask_sym= "eq0";
					break;
			  case 0x3:	cond_mask_sym= "ge0";
					break;
			  case 0xc:	cond_mask_sym= "lt0";
					break;
			  case 0xd:	cond_mask_sym= "ne0";
					break;
			  case 0xe:	cond_mask_sym= "le0";
					break;
			  default:	cond_mask_sym= cond_mask_sym_buf;
					sprintf( cond_mask_sym_buf,
						 "%x",
						 extracted_field );
					break;
			}
			strcpy( buf, cond_mask_sym );
			break;
			
      case PCREL:
		        if (!first)
			   *buf++= ',';
			sprint_address( pc + 4*(SEXT(inst,opptr->offset,opptr->width)),
					buf );
		        break;

      case CONT:
		       sprintf( buf,
				"%d,r%d",
				UEXT(inst,opptr->offset,5),
			        UEXT(inst,(opptr->offset)+5,5) );
		       break;

      case BF:
		       if (!first)
			   *buf++= ',';
		       sprintf( buf,
				"%d<%d>",
				UEXT(inst,(opptr->offset)+5,5),
			        UEXT(inst,opptr->offset,5));
		       break;

      default:
		       sprintf( buf, "<dis error: %08x>", inst );
    }

}

/*
*                 Initialize the Disassembler Instruction Table
*
*       Initialize the hash table and instruction table for the disassembler.
*       This should be called once before the first call to disasm().
*
*			Parameters
*
*			Output
*
*       If the debug option is selected, certain statistics about the hashing
*       distribution are written to stdout.
*
*			Revision History
*
*       Revision 1.0    11/08/85        Creation date
*/

init_disasm()
{
   int i,size;

   for (i=0 ; i < HASHVAL ; i++)
      hashtable[i] = NULL;

   for (i=0, size =  sizeof(instructions) / sizeof(INSTAB) ; i < size ;
       install(&instructions[i++]));

}

/*
*       Insert an instruction into the disassembler table by hashing the
*       opcode and inserting it into the linked list for that hash value.
*
*			Parameters
*
*       INSTAB *instptr         Pointer to the entry in the instruction table
*                               to be installed
*
*       Revision 1.0    11/08/85        Creation date
*			05/11/89	R. TRAWICK ADAPTED FROM MOTOROLA
*/

install(instptr)
   INSTAB *instptr;
{
   UINT i;

   i = (instptr->opcode) % HASHVAL;
   instptr->next = hashtable[i];
   hashtable[i] = instptr;
}
\f

/* adapted from print_address in printcmd by R. Trawick 5/15/89.  The two should
   be combined.
 */

void sprint_address (addr, buffer)

     CORE_ADDR  addr;
     char	*buffer;

{
	struct minimal_symbol *msymbol;
	struct symbol	*fs;
	char		*name;
	int		name_location;

	sprintf ( buffer, "0x%x", addr);

	fs = find_pc_function (addr);

	if (!fs) {
	    msymbol = lookup_minimal_symbol_by_pc (addr);

	    if (msymbol == NULL) return;  /* If nothing comes through, don't
					     print anything symbolic */

	    name = msymbol -> name;
	    name_location = msymbol -> address;
	} else {
	    name = fs->name;
	    name_location = BLOCK_START (SYMBOL_BLOCK_VALUE (fs));
	}

	if (addr - name_location)
	    sprintf (buffer, " <%s+%d>", name, addr - name_location);
	else
	    sprintf (buffer, " <%s>", name);
}
Commit	Line	Data
7d9884b9 JG	1	/* Print instructions for the Motorola 88000, for GDB and GNU Binutils.
	2	Copyright 1986, 1987, 1988, 1989, 1990, 1991 Free Software Foundation, Inc.
	3	Contributed by Data General Corporation, November 1989.
	4	Partially derived from an earlier printcmd.c.
	5
	6	This file is part of GDB and the GNU Binutils.
	7
	8	This program 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 of the License, or
	11	(at your option) any later version.
	12
	13	This program 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 this program; if not, write to the Free Software
	20	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
8aa13b87	21
8aa13b87	22	#include "defs.h"
d747e0af	23	#include "opcode/m88k.h"
8aa13b87 JK	24	#include "symtab.h"
	25
	26	void sprint_address ();
	27
8aa13b87 JK	28	INSTAB *hashtable[HASHVAL] = {0};
	29
	30	/*
	31	* Disassemble an M88000 Instruction
	32	*
	33	*
	34	* This module decodes the first instruction in inbuf. It uses the pc
	35	* to display pc-relative displacements. It writes the disassembled
	36	* instruction in outbuf.
	37	*
	38	* Revision History
	39	*
	40	* Revision 1.0 11/08/85 Creation date by Motorola
	41	* 05/11/89 R. Trawick adapted to GDB interface.
	42	*/
	43	#define MAXLEN 20
	44
	45	print_insn (memaddr, stream)
	46	CORE_ADDR memaddr;
	47	FILE *stream;
	48	{
	49	unsigned char buffer[MAXLEN];
	50	/* should be expanded if disassembler prints symbol names */
	51	char outbuf[100];
	52	int n;
	53
	54	/* Instruction addresses may have low two bits set. Clear them. */
	55	memaddr&= 0xfffffffc;
	56	read_memory (memaddr, buffer, MAXLEN);
	57
	58	n = m88kdis ((int)memaddr, buffer, outbuf);
	59
	60	fputs (outbuf, stream);
	61
	62	return (n);
	63	}
	64
	65	/*
	66	* disassemble the first instruction in 'inbuf'.
	67	* 'pc' should be the address of this instruction, it will
	68	* be used to print the target address if this is a relative jump or call
	69	* 'outbuf' gets filled in with the disassembled instruction. It should
	70	* be long enough to hold the longest disassembled instruction.
	71	* 100 bytes is certainly enough, unless symbol printing is added later
	72	* The function returns the length of this instruction in bytes.
	73	*/
	74
	75	int m88kdis( pc, inbuf, outbuf )
	76
	77	int pc;
	78	int *inbuf;
	79	char *outbuf;
	80
	81	{ static ihashtab_initialized = 0;
	82	int instruction;
	83	unsigned int opcode;
	84	INSTAB *entry_ptr;
	85	int opmask;
	86	int class;
	87
	88	instruction= *inbuf;
	89
	90	if (!ihashtab_initialized) {
	91	init_disasm();
92	}
93
94	/* create a the appropriate mask to isolate the opcode */
95	opmask= DEFMASK;
96	class= instruction & DEFMASK;
97	if ((class >= SFU0) && (class <= SFU7)) {
98	if (instruction < SFU1) {
99	opmask= CTRLMASK;
100	} else {
101	opmask= SFUMASK;
102	}
103	} else if (class == RRR) {
104	opmask= RRRMASK;
105	} else if (class == RRI10) {
106	opmask= RRI10MASK;
107	}
108
109	/* isolate the opcode */
110	opcode= instruction & opmask;
111
112	/* search the hash table with the isolated opcode */
113	for (entry_ptr= hashtable[ opcode % HASHVAL ];
114	(entry_ptr != NULL) && (entry_ptr->opcode != opcode);
115	entry_ptr= entry_ptr->next) {
116	}
117
118	if (entry_ptr == NULL) {
119	sprintf( outbuf, "word\t%08x", instruction );
120	} else {
121	sprintf( outbuf, "%s\t", entry_ptr->mnemonic );
122	sprintop( &outbuf[strlen(outbuf)], &(entry_ptr->op1), instruction, pc, 1 );
123	sprintop( &outbuf[strlen(outbuf)], &(entry_ptr->op2), instruction, pc, 0 );
124	sprintop( &outbuf[strlen(outbuf)], &(entry_ptr->op3), instruction, pc, 0 );
125	}
126
127
128	return 4;
129	}
130	\f
131
132	/*
133	* Decode an Operand of an Instruction
134	*
135	* Functional Description
136	*
137	* This module formats and writes an operand of an instruction to buf
138	* based on the operand specification. When the first flag is set this
139	* is the first operand of an instruction. Undefined operand types
140	* cause a <dis error> message.
141	*
142	* Parameters
143	* char *buf buffer where the operand may be printed
144	* OPSPEC *opptr Pointer to an operand specification
145	* UINT inst Instruction from which operand is extracted
146	* UINT pc PC of instruction; used for pc-relative disp.
147	* int first Flag which if nonzero indicates the first
148	* operand of an instruction
149	*
150	* Output
151	*
152	* The operand specified is extracted from the instruction and is
153	* written to buf in the format specified. The operand is preceded
154	* by a comma if it is not the first operand of an instruction and it
155	* is not a register indirect form. Registers are preceded by 'r' and
156	* hex values by '0x'.
157	*
158	* Revision History
159	*
160	* Revision 1.0 11/08/85 Creation date
161	*/
162
163	sprintop( buf, opptr, inst, pc, first )
164
165	char *buf;
166	OPSPEC *opptr;
167	UINT inst;
168	int pc;
169	int first;
170
171	{ int extracted_field;
172	char *cond_mask_sym;
173	char cond_mask_sym_buf[6];
174
175	if (opptr->width == 0)
176	return;
177
178	switch(opptr->type) {
179	case CRREG:
180	if (!first)
181	*buf++= ',';
182	sprintf( buf, "cr%d", UEXT(inst,opptr->offset,opptr->width));
183	break;
184
185	case FCRREG:
186	if (!first)
187	*buf++= ',';
188	sprintf( buf, "fcr%d", UEXT(inst,opptr->offset,opptr->width));
189	break;
190
191	case REGSC:
192	sprintf( buf, "[r%d]", UEXT(inst,opptr->offset,opptr->width));
193	break;
194
195	case REG:
196	if (!first)
197	*buf++= ',';
198	sprintf( buf, "r%d", UEXT(inst,opptr->offset,opptr->width));
199	break;
200
201	case HEX:
202	if (!first)
203	*buf++= ',';
204	extracted_field= UEXT(inst, opptr->offset, opptr->width);
205	if (extracted_field == 0) {
206	sprintf( buf, "0" );
207	} else {
208	sprintf( buf, "0x%02x", extracted_field );
209	}
210	break;
211
212	case CONDMASK:
213	if (!first)
214	*buf++= ',';
215	extracted_field= UEXT(inst, opptr->offset, opptr->width);
216	switch (extracted_field & 0x0f) {
217	case 0x1: cond_mask_sym= "gt0";
218	break;
219	case 0x2: cond_mask_sym= "eq0";
220	break;
221	case 0x3: cond_mask_sym= "ge0";
222	break;
223	case 0xc: cond_mask_sym= "lt0";
224	break;
225	case 0xd: cond_mask_sym= "ne0";
226	break;
227	case 0xe: cond_mask_sym= "le0";
228	break;
229	default: cond_mask_sym= cond_mask_sym_buf;
230	sprintf( cond_mask_sym_buf,
231	"%x",
232	extracted_field );
233	break;
234	}
235	strcpy( buf, cond_mask_sym );
236	break;
237
238	case PCREL:
239	if (!first)
240	*buf++= ',';
241	sprint_address( pc + 4*(SEXT(inst,opptr->offset,opptr->width)),
242	buf );
243	break;
244
245	case CONT:
246	sprintf( buf,
247	"%d,r%d",
248	UEXT(inst,opptr->offset,5),
249	UEXT(inst,(opptr->offset)+5,5) );
250	break;
251
252	case BF:
253	if (!first)
254	*buf++= ',';
255	sprintf( buf,
256	"%d<%d>",
257	UEXT(inst,(opptr->offset)+5,5),
258	UEXT(inst,opptr->offset,5));
259	break;
260
261	default:
262	sprintf( buf, "<dis error: %08x>", inst );
263	}
264
265	}
266
267	/*
268	* Initialize the Disassembler Instruction Table
269	*
270	* Initialize the hash table and instruction table for the disassembler.
271	* This should be called once before the first call to disasm().
272	*
273	* Parameters
274	*
275	* Output
276	*
277	* If the debug option is selected, certain statistics about the hashing
278	* distribution are written to stdout.
279	*
280	* Revision History
281	*
282	* Revision 1.0 11/08/85 Creation date
283	*/
284
285	init_disasm()
286	{
287	int i,size;
288
289	for (i=0 ; i < HASHVAL ; i++)
290	hashtable[i] = NULL;
291
292	for (i=0, size = sizeof(instructions) / sizeof(INSTAB) ; i < size ;
293	install(&instructions[i++]));
294
295	}
296
297	/*
298	* Insert an instruction into the disassembler table by hashing the
299	* opcode and inserting it into the linked list for that hash value.
300	*
301	* Parameters
302	*
303	* INSTAB *instptr Pointer to the entry in the instruction table
304	* to be installed
305	*
306	* Revision 1.0 11/08/85 Creation date
307	* 05/11/89 R. TRAWICK ADAPTED FROM MOTOROLA
308	*/
309
310	install(instptr)
311	INSTAB *instptr;
312	{
313	UINT i;
314
315	i = (instptr->opcode) % HASHVAL;
316	instptr->next = hashtable[i];
317	hashtable[i] = instptr;
318	}
319	\f
320
321	/* adapted from print_address in printcmd by R. Trawick 5/15/89. The two should
322	be combined.
323	*/
324
325	void sprint_address (addr, buffer)
326
327	CORE_ADDR addr;
328	char *buffer;
329
330	{
1ab3bf1b	331	struct minimal_symbol *msymbol;
8aa13b87 JK	332	struct symbol *fs;
	333	char *name;
	334	int name_location;
	335
	336	sprintf ( buffer, "0x%x", addr);
	337
	338	fs = find_pc_function (addr);
	339
	340	if (!fs) {
1ab3bf1b	341	msymbol = lookup_minimal_symbol_by_pc (addr);
8aa13b87	342
6ad6ef42 JG	343	if (msymbol == NULL) return; /* If nothing comes through, don't
6ad6ef42 JG	344	print anything symbolic */
8aa13b87	345
1ab3bf1b JG	346	name = msymbol -> name;
1ab3bf1b JG	347	name_location = msymbol -> address;
8aa13b87 JK	348	} else {
	349	name = fs->name;
	350	name_location = BLOCK_START (SYMBOL_BLOCK_VALUE (fs));
	351	}
	352
	353	if (addr - name_location)
	354	sprintf (buffer, " <%s+%d>", name, addr - name_location);
	355	else
	356	sprintf (buffer, " <%s>", name);
	357	}