374 lines
8.7 KiB
C
374 lines
8.7 KiB
C
/* Print DEC PDP-11 instructions.
|
|
Copyright 2001, 2002, 2004, 2005, 2007 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU opcodes library.
|
|
|
|
This library 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 3, or (at your option)
|
|
any later version.
|
|
|
|
It 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., 51 Franklin Street - Fifth Floor, Boston,
|
|
MA 02110-1301, USA. */
|
|
|
|
#include "sysdep.h"
|
|
#include "dis-asm.h"
|
|
#include "opcode/pdp11.h"
|
|
|
|
#define AFTER_INSTRUCTION "\t"
|
|
#define OPERAND_SEPARATOR ", "
|
|
|
|
#define JUMP 0x1000 /* Flag that this operand is used in a jump. */
|
|
|
|
#define FPRINTF (*info->fprintf_func)
|
|
#define F info->stream
|
|
|
|
/* Sign-extend a 16-bit number in an int. */
|
|
#define SIGN_BITS (8 * sizeof (int) - 16)
|
|
#define sign_extend(x) (((x) << SIGN_BITS) >> SIGN_BITS)
|
|
|
|
static int
|
|
read_word (bfd_vma memaddr, int *word, disassemble_info *info)
|
|
{
|
|
int status;
|
|
bfd_byte x[2];
|
|
|
|
status = (*info->read_memory_func) (memaddr, x, 2, info);
|
|
if (status != 0)
|
|
return -1;
|
|
|
|
*word = x[1] << 8 | x[0];
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
print_signed_octal (int n, disassemble_info *info)
|
|
{
|
|
if (n < 0)
|
|
FPRINTF (F, "-%o", -n);
|
|
else
|
|
FPRINTF (F, "%o", n);
|
|
}
|
|
|
|
static void
|
|
print_reg (int reg, disassemble_info *info)
|
|
{
|
|
/* Mask off the addressing mode, if any. */
|
|
reg &= 7;
|
|
|
|
switch (reg)
|
|
{
|
|
case 0: case 1: case 2: case 3: case 4: case 5:
|
|
FPRINTF (F, "r%d", reg); break;
|
|
case 6: FPRINTF (F, "sp"); break;
|
|
case 7: FPRINTF (F, "pc"); break;
|
|
default: ; /* error */
|
|
}
|
|
}
|
|
|
|
static void
|
|
print_freg (int freg, disassemble_info *info)
|
|
{
|
|
FPRINTF (F, "fr%d", freg);
|
|
}
|
|
|
|
static int
|
|
print_operand (bfd_vma *memaddr, int code, disassemble_info *info)
|
|
{
|
|
int mode = (code >> 3) & 7;
|
|
int reg = code & 7;
|
|
int disp;
|
|
|
|
switch (mode)
|
|
{
|
|
case 0:
|
|
print_reg (reg, info);
|
|
break;
|
|
case 1:
|
|
FPRINTF (F, "(");
|
|
print_reg (reg, info);
|
|
FPRINTF (F, ")");
|
|
break;
|
|
case 2:
|
|
if (reg == 7)
|
|
{
|
|
int data;
|
|
|
|
if (read_word (*memaddr, &data, info) < 0)
|
|
return -1;
|
|
FPRINTF (F, "$");
|
|
print_signed_octal (sign_extend (data), info);
|
|
*memaddr += 2;
|
|
}
|
|
else
|
|
{
|
|
FPRINTF (F, "(");
|
|
print_reg (reg, info);
|
|
FPRINTF (F, ")+");
|
|
}
|
|
break;
|
|
case 3:
|
|
if (reg == 7)
|
|
{
|
|
int address;
|
|
|
|
if (read_word (*memaddr, &address, info) < 0)
|
|
return -1;
|
|
FPRINTF (F, "*$%o", address);
|
|
*memaddr += 2;
|
|
}
|
|
else
|
|
{
|
|
FPRINTF (F, "*(");
|
|
print_reg (reg, info);
|
|
FPRINTF (F, ")+");
|
|
}
|
|
break;
|
|
case 4:
|
|
FPRINTF (F, "-(");
|
|
print_reg (reg, info);
|
|
FPRINTF (F, ")");
|
|
break;
|
|
case 5:
|
|
FPRINTF (F, "*-(");
|
|
print_reg (reg, info);
|
|
FPRINTF (F, ")");
|
|
break;
|
|
case 6:
|
|
case 7:
|
|
if (read_word (*memaddr, &disp, info) < 0)
|
|
return -1;
|
|
*memaddr += 2;
|
|
if (reg == 7)
|
|
{
|
|
bfd_vma address = *memaddr + sign_extend (disp);
|
|
|
|
if (mode == 7)
|
|
FPRINTF (F, "*");
|
|
if (!(code & JUMP))
|
|
FPRINTF (F, "$");
|
|
(*info->print_address_func) (address, info);
|
|
}
|
|
else
|
|
{
|
|
if (mode == 7)
|
|
FPRINTF (F, "*");
|
|
print_signed_octal (sign_extend (disp), info);
|
|
FPRINTF (F, "(");
|
|
print_reg (reg, info);
|
|
FPRINTF (F, ")");
|
|
}
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
print_foperand (bfd_vma *memaddr, int code, disassemble_info *info)
|
|
{
|
|
int mode = (code >> 3) & 7;
|
|
int reg = code & 7;
|
|
|
|
if (mode == 0)
|
|
print_freg (reg, info);
|
|
else
|
|
return print_operand (memaddr, code, info);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Print the PDP-11 instruction at address MEMADDR in debugged memory,
|
|
on INFO->STREAM. Returns length of the instruction, in bytes. */
|
|
|
|
int
|
|
print_insn_pdp11 (bfd_vma memaddr, disassemble_info *info)
|
|
{
|
|
bfd_vma start_memaddr = memaddr;
|
|
int opcode;
|
|
int src, dst;
|
|
int i;
|
|
|
|
info->bytes_per_line = 6;
|
|
info->bytes_per_chunk = 2;
|
|
info->display_endian = BFD_ENDIAN_LITTLE;
|
|
|
|
if (read_word (memaddr, &opcode, info) != 0)
|
|
return -1;
|
|
memaddr += 2;
|
|
|
|
src = (opcode >> 6) & 0x3f;
|
|
dst = opcode & 0x3f;
|
|
|
|
for (i = 0; i < pdp11_num_opcodes; i++)
|
|
{
|
|
#define OP pdp11_opcodes[i]
|
|
if ((opcode & OP.mask) == OP.opcode)
|
|
switch (OP.type)
|
|
{
|
|
case PDP11_OPCODE_NO_OPS:
|
|
FPRINTF (F, OP.name);
|
|
goto done;
|
|
case PDP11_OPCODE_REG:
|
|
FPRINTF (F, OP.name);
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
print_reg (dst, info);
|
|
goto done;
|
|
case PDP11_OPCODE_OP:
|
|
FPRINTF (F, OP.name);
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
if (strcmp (OP.name, "jmp") == 0)
|
|
dst |= JUMP;
|
|
if (print_operand (&memaddr, dst, info) < 0)
|
|
return -1;
|
|
goto done;
|
|
case PDP11_OPCODE_FOP:
|
|
FPRINTF (F, OP.name);
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
if (strcmp (OP.name, "jmp") == 0)
|
|
dst |= JUMP;
|
|
if (print_foperand (&memaddr, dst, info) < 0)
|
|
return -1;
|
|
goto done;
|
|
case PDP11_OPCODE_REG_OP:
|
|
FPRINTF (F, OP.name);
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
print_reg (src, info);
|
|
FPRINTF (F, OPERAND_SEPARATOR);
|
|
if (strcmp (OP.name, "jsr") == 0)
|
|
dst |= JUMP;
|
|
if (print_operand (&memaddr, dst, info) < 0)
|
|
return -1;
|
|
goto done;
|
|
case PDP11_OPCODE_REG_OP_REV:
|
|
FPRINTF (F, OP.name);
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
if (print_operand (&memaddr, dst, info) < 0)
|
|
return -1;
|
|
FPRINTF (F, OPERAND_SEPARATOR);
|
|
print_reg (src, info);
|
|
goto done;
|
|
case PDP11_OPCODE_AC_FOP:
|
|
{
|
|
int ac = (opcode & 0xe0) >> 6;
|
|
FPRINTF (F, OP.name);
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
print_freg (ac, info);
|
|
FPRINTF (F, OPERAND_SEPARATOR);
|
|
if (print_foperand (&memaddr, dst, info) < 0)
|
|
return -1;
|
|
goto done;
|
|
}
|
|
case PDP11_OPCODE_FOP_AC:
|
|
{
|
|
int ac = (opcode & 0xe0) >> 6;
|
|
FPRINTF (F, OP.name);
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
if (print_foperand (&memaddr, dst, info) < 0)
|
|
return -1;
|
|
FPRINTF (F, OPERAND_SEPARATOR);
|
|
print_freg (ac, info);
|
|
goto done;
|
|
}
|
|
case PDP11_OPCODE_AC_OP:
|
|
{
|
|
int ac = (opcode & 0xe0) >> 6;
|
|
FPRINTF (F, OP.name);
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
print_freg (ac, info);
|
|
FPRINTF (F, OPERAND_SEPARATOR);
|
|
if (print_operand (&memaddr, dst, info) < 0)
|
|
return -1;
|
|
goto done;
|
|
}
|
|
case PDP11_OPCODE_OP_AC:
|
|
{
|
|
int ac = (opcode & 0xe0) >> 6;
|
|
FPRINTF (F, OP.name);
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
if (print_operand (&memaddr, dst, info) < 0)
|
|
return -1;
|
|
FPRINTF (F, OPERAND_SEPARATOR);
|
|
print_freg (ac, info);
|
|
goto done;
|
|
}
|
|
case PDP11_OPCODE_OP_OP:
|
|
FPRINTF (F, OP.name);
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
if (print_operand (&memaddr, src, info) < 0)
|
|
return -1;
|
|
FPRINTF (F, OPERAND_SEPARATOR);
|
|
if (print_operand (&memaddr, dst, info) < 0)
|
|
return -1;
|
|
goto done;
|
|
case PDP11_OPCODE_DISPL:
|
|
{
|
|
int displ = (opcode & 0xff) << 8;
|
|
bfd_vma address = memaddr + (sign_extend (displ) >> 7);
|
|
FPRINTF (F, OP.name);
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
(*info->print_address_func) (address, info);
|
|
goto done;
|
|
}
|
|
case PDP11_OPCODE_REG_DISPL:
|
|
{
|
|
int displ = (opcode & 0x3f) << 10;
|
|
bfd_vma address = memaddr - (displ >> 9);
|
|
|
|
FPRINTF (F, OP.name);
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
print_reg (src, info);
|
|
FPRINTF (F, OPERAND_SEPARATOR);
|
|
(*info->print_address_func) (address, info);
|
|
goto done;
|
|
}
|
|
case PDP11_OPCODE_IMM8:
|
|
{
|
|
int code = opcode & 0xff;
|
|
FPRINTF (F, OP.name);
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
FPRINTF (F, "%o", code);
|
|
goto done;
|
|
}
|
|
case PDP11_OPCODE_IMM6:
|
|
{
|
|
int code = opcode & 0x3f;
|
|
FPRINTF (F, OP.name);
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
FPRINTF (F, "%o", code);
|
|
goto done;
|
|
}
|
|
case PDP11_OPCODE_IMM3:
|
|
{
|
|
int code = opcode & 7;
|
|
FPRINTF (F, OP.name);
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
FPRINTF (F, "%o", code);
|
|
goto done;
|
|
}
|
|
case PDP11_OPCODE_ILLEGAL:
|
|
{
|
|
FPRINTF (F, ".word");
|
|
FPRINTF (F, AFTER_INSTRUCTION);
|
|
FPRINTF (F, "%o", opcode);
|
|
goto done;
|
|
}
|
|
default:
|
|
/* TODO: is this a proper way of signalling an error? */
|
|
FPRINTF (F, "<internal error: unrecognized instruction type>");
|
|
return -1;
|
|
}
|
|
#undef OP
|
|
}
|
|
done:
|
|
|
|
return memaddr - start_memaddr;
|
|
}
|