306 lines
7.8 KiB
C
306 lines
7.8 KiB
C
/* Print VAX instructions for GDB, the GNU debugger.
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Copyright 1986, 1989, 1991, 1992, 1996 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "symtab.h"
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#include "opcode/vax.h"
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/* Vax instructions are never longer than this. */
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#define MAXLEN 62
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/* Number of elements in the opcode table. */
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#define NOPCODES (sizeof votstrs / sizeof votstrs[0])
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static unsigned char *print_insn_arg ();
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/* Advance PC across any function entry prologue instructions
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to reach some "real" code. */
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CORE_ADDR
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vax_skip_prologue (pc)
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CORE_ADDR pc;
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{
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register int op = (unsigned char) read_memory_integer (pc, 1);
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if (op == 0x11)
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pc += 2; /* skip brb */
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if (op == 0x31)
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pc += 3; /* skip brw */
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if (op == 0xC2
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&& ((unsigned char) read_memory_integer (pc + 2, 1)) == 0x5E)
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pc += 3; /* skip subl2 */
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if (op == 0x9E
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&& ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xAE
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&& ((unsigned char) read_memory_integer (pc + 3, 1)) == 0x5E)
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pc += 4; /* skip movab */
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if (op == 0x9E
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&& ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xCE
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&& ((unsigned char) read_memory_integer (pc + 4, 1)) == 0x5E)
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pc += 5; /* skip movab */
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if (op == 0x9E
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&& ((unsigned char) read_memory_integer (pc + 1, 1)) == 0xEE
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&& ((unsigned char) read_memory_integer (pc + 6, 1)) == 0x5E)
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pc += 7; /* skip movab */
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return pc;
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}
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/* Return number of args passed to a frame.
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Can return -1, meaning no way to tell. */
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int
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vax_frame_num_args (fi)
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struct frame_info *fi;
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{
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return (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi), 1));
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}
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/* Print the vax instruction at address MEMADDR in debugged memory,
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from disassembler info INFO.
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Returns length of the instruction, in bytes. */
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static int
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vax_print_insn (memaddr, info)
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CORE_ADDR memaddr;
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disassemble_info *info;
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{
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unsigned char buffer[MAXLEN];
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register int i;
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register unsigned char *p;
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register char *d;
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int status = (*info->read_memory_func) (memaddr, buffer, MAXLEN, info);
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if (status != 0)
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{
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(*info->memory_error_func) (status, memaddr, info);
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return -1;
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}
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for (i = 0; i < NOPCODES; i++)
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if (votstrs[i].detail.code == buffer[0]
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|| votstrs[i].detail.code == *(unsigned short *) buffer)
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break;
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/* Handle undefined instructions. */
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if (i == NOPCODES)
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{
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(*info->fprintf_func) (info->stream, "0%o", buffer[0]);
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return 1;
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}
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(*info->fprintf_func) (info->stream, "%s", votstrs[i].name);
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/* Point at first byte of argument data,
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and at descriptor for first argument. */
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p = buffer + 1 + (votstrs[i].detail.code >= 0x100);
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d = votstrs[i].detail.args;
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if (*d)
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(*info->fprintf_func) (info->stream, " ");
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while (*d)
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{
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p = print_insn_arg (d, p, memaddr + (p - buffer), info);
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d += 2;
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if (*d)
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(*info->fprintf_func) (info->stream, ",");
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}
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return p - buffer;
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}
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static unsigned char *
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print_insn_arg (d, p, addr, info)
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char *d;
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register char *p;
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CORE_ADDR addr;
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disassemble_info *info;
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{
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register int regnum = *p & 0xf;
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float floatlitbuf;
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if (*d == 'b')
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{
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if (d[1] == 'b')
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(*info->fprintf_func) (info->stream, "0x%x", addr + *p++ + 1);
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else
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{
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(*info->fprintf_func) (info->stream, "0x%x", addr + *(short *) p + 2);
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p += 2;
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}
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}
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else
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switch ((*p++ >> 4) & 0xf)
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{
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case 0:
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case 1:
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case 2:
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case 3: /* Literal mode */
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if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h')
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{
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*(int *) &floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4);
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(*info->fprintf_func) (info->stream, "$%f", floatlitbuf);
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}
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else
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(*info->fprintf_func) (info->stream, "$%d", p[-1] & 0x3f);
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break;
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case 4: /* Indexed */
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p = (char *) print_insn_arg (d, p, addr + 1, info);
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(*info->fprintf_func) (info->stream, "[%s]", REGISTER_NAME (regnum));
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break;
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case 5: /* Register */
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(*info->fprintf_func) (info->stream, REGISTER_NAME (regnum));
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break;
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case 7: /* Autodecrement */
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(*info->fprintf_func) (info->stream, "-");
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case 6: /* Register deferred */
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(*info->fprintf_func) (info->stream, "(%s)", REGISTER_NAME (regnum));
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break;
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case 9: /* Autoincrement deferred */
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(*info->fprintf_func) (info->stream, "@");
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if (regnum == PC_REGNUM)
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{
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(*info->fprintf_func) (info->stream, "#");
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info->target = *(long *) p;
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(*info->print_address_func) (info->target, info);
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p += 4;
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break;
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}
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case 8: /* Autoincrement */
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if (regnum == PC_REGNUM)
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{
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(*info->fprintf_func) (info->stream, "#");
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switch (d[1])
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{
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case 'b':
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(*info->fprintf_func) (info->stream, "%d", *p++);
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break;
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case 'w':
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(*info->fprintf_func) (info->stream, "%d", *(short *) p);
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p += 2;
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break;
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case 'l':
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(*info->fprintf_func) (info->stream, "%d", *(long *) p);
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p += 4;
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break;
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case 'q':
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(*info->fprintf_func) (info->stream, "0x%x%08x",
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((long *) p)[1], ((long *) p)[0]);
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p += 8;
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break;
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case 'o':
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(*info->fprintf_func) (info->stream, "0x%x%08x%08x%08x",
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((long *) p)[3], ((long *) p)[2],
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((long *) p)[1], ((long *) p)[0]);
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p += 16;
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break;
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case 'f':
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if (INVALID_FLOAT (p, 4))
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(*info->fprintf_func) (info->stream,
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"<<invalid float 0x%x>>",
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*(int *) p);
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else
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(*info->fprintf_func) (info->stream, "%f", *(float *) p);
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p += 4;
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break;
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case 'd':
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if (INVALID_FLOAT (p, 8))
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(*info->fprintf_func) (info->stream,
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"<<invalid float 0x%x%08x>>",
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((long *) p)[1], ((long *) p)[0]);
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else
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(*info->fprintf_func) (info->stream, "%f", *(double *) p);
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p += 8;
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break;
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case 'g':
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(*info->fprintf_func) (info->stream, "g-float");
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p += 8;
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break;
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case 'h':
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(*info->fprintf_func) (info->stream, "h-float");
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p += 16;
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break;
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}
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}
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else
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(*info->fprintf_func) (info->stream, "(%s)+", REGISTER_NAME (regnum));
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break;
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case 11: /* Byte displacement deferred */
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(*info->fprintf_func) (info->stream, "@");
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case 10: /* Byte displacement */
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if (regnum == PC_REGNUM)
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{
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info->target = addr + *p + 2;
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(*info->print_address_func) (info->target, info);
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}
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else
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(*info->fprintf_func) (info->stream, "%d(%s)", *p, REGISTER_NAME (regnum));
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p += 1;
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break;
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case 13: /* Word displacement deferred */
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(*info->fprintf_func) (info->stream, "@");
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case 12: /* Word displacement */
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if (regnum == PC_REGNUM)
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{
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info->target = addr + *(short *) p + 3;
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(*info->print_address_func) (info->target, info);
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}
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else
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(*info->fprintf_func) (info->stream, "%d(%s)",
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*(short *) p, REGISTER_NAME (regnum));
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p += 2;
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break;
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case 15: /* Long displacement deferred */
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(*info->fprintf_func) (info->stream, "@");
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case 14: /* Long displacement */
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if (regnum == PC_REGNUM)
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{
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info->target = addr + *(short *) p + 5;
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(*info->print_address_func) (info->target, info);
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}
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else
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(*info->fprintf_func) (info->stream, "%d(%s)",
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*(long *) p, REGISTER_NAME (regnum));
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p += 4;
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}
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return (unsigned char *) p;
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}
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void
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_initialize_vax_tdep ()
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{
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tm_print_insn = vax_print_insn;
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}
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