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/* Instruction printing code for the Alpha
Copyright (C) 1993, 1995 Free Software Foundation, Inc.
Contributed by Cygnus Support.
Written by Steve Chamberlain (sac@cygnus.com)
This file is part of libopcodes.
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, Boston, MA 02111-1307, USA.
*/
#include "dis-asm.h"
#define DEFINE_TABLE
#include "alpha-opc.h"
/* Print one instruction from PC on INFO->STREAM.
Return the size of the instruction (always 4 on alpha). */
int
print_insn_alpha(pc, info)
bfd_vma pc;
struct disassemble_info *info;
{
alpha_insn *insn;
unsigned char b[4];
void *stream = info->stream;
fprintf_ftype func = info->fprintf_func;
unsigned long given;
int status ;
int found = 0;
status = (*info->read_memory_func) (pc, (bfd_byte *) &b[0], 4, info);
if (status != 0) {
(*info->memory_error_func) (status, pc, info);
return -1;
}
given = (b[0]) | (b[1] << 8) | (b[2] << 16) | (b[3] << 24);
func (stream, "\t%08x\t", given);
for (insn = alpha_insn_set;
insn->name && !found;
insn++)
{
switch (insn->type)
{
case MEMORY_FORMAT_CODE:
if ((insn->i & MEMORY_FORMAT_MASK)
==(given & MEMORY_FORMAT_MASK))
{
func (stream, "%s\t%s, %d(%s)",
insn->name,
alpha_regs[RA(given)],
OPCODE (given) == 9 ? DISP(given) * 65536 : DISP(given),
alpha_regs[RB(given)]);
found = 1;
}
break;
case MEMORY_FUNCTION_FORMAT_CODE:
if ((insn->i & MEMORY_FUNCTION_FORMAT_MASK)
==(given & MEMORY_FUNCTION_FORMAT_MASK))
{
switch (given & 0xffff)
{
case 0x8000: /* fetch */
case 0xa000: /* fetch_m */
func (stream, "%s\t(%s)", insn->name, alpha_regs[RB(given)]);
break;
case 0xc000: /* rpcc */
func (stream, "%s\t%s", insn->name, alpha_regs[RA(given)]);
break;
default:
func (stream, "%s", insn->name);
break;
}
found = 1;
}
break;
case BRANCH_FORMAT_CODE:
if ((insn->i & BRANCH_FORMAT_MASK)
== (given & BRANCH_FORMAT_MASK))
{
if (RA(given) == 31)
func (stream, "%s\t ", insn->name);
else
func (stream, "%s\t%s, ", insn->name,
alpha_regs[RA(given)]);
(*info->print_address_func) (BDISP(given) * 4 + pc + 4, info);
found = 1;
}
break;
case MEMORY_BRANCH_FORMAT_CODE:
if ((insn->i & MEMORY_BRANCH_FORMAT_MASK)
== (given & MEMORY_BRANCH_FORMAT_MASK))
{
if (given & (1<<15))
{
func (stream, "%s\t%s, (%s), %d", insn->name,
alpha_regs[RA(given)],
alpha_regs[RB(given)],
JUMP_HINT(given));
}
else
{
/* The displacement is a hint only, do not put out
a symbolic address. */
func (stream, "%s\t%s, (%s), 0x%lx", insn->name,
alpha_regs[RA(given)],
alpha_regs[RB(given)],
JDISP(given) * 4 + pc + 4);
}
found = 1;
}
break;
case OPERATE_FORMAT_CODE:
if ((insn->i & OPERATE_FORMAT_MASK)
== (given & OPERATE_FORMAT_MASK))
{
int optype = OP_OPTYPE(given);
if (OP_OPTYPE(insn->i) == optype)
{
int ra;
ra = RA(given);
if (OP_IS_CONSTANT(given))
{
if ((optype == 0x20) /* bis R31, lit, Ry */
&& (ra == 31))
{
func (stream, "mov\t0x%x, %s",
LITERAL(given), alpha_regs[RC(given)] );
}
else
{
#if GNU_ASMCODE
func (stream, "%s\t%s, 0x%x, %s", insn->name,
alpha_regs[RA(given)],
LITERAL(given),
alpha_regs[RC(given)]);
#else
func (stream, "%s\t%s, #%d, %s", insn->name,
alpha_regs[RA(given)],
LITERAL(given),
alpha_regs[RC(given)]);
}
#endif
} else { /* not constant */
int rb, rc;
rb = RB(given); rc = RC(given);
switch(optype)
{
case 0x09: /* subl */
if (ra == 31)
{
func (stream, "negl\t%s, %s",
alpha_regs[rb], alpha_regs[rc]);
found = 1;
}
break;
case 0x29: /* subq */
if (ra == 31)
{
func (stream, "negq\t%s, %s",
alpha_regs[rb], alpha_regs[rc]);
found = 1;
}
break;
case 0x20: /* bis */
if (ra == 31)
{
if (ra == rb) /* ra=R31, rb=R31 */
{
if (rc == 31)
func (stream, "nop");
else
func (stream, "clr\t%s", alpha_regs[rc]);
}
else
func (stream, "mov\t%s, %s",
alpha_regs[rb], alpha_regs[rc]);
}
else
func (stream, "or\t%s, %s, %s",
alpha_regs[ra], alpha_regs[rb], alpha_regs[rc]);
found = 1;
break;
default:
break;
}
if (!found)
func (stream, "%s\t%s, %s, %s", insn->name,
alpha_regs[ra], alpha_regs[rb], alpha_regs[rc]);
}
found = 1;
}
}
break;
case FLOAT_FORMAT_CODE:
if ((insn->i & OPERATE_FORMAT_MASK)
== (given & OPERATE_FORMAT_MASK))
{
int ra, rb, rc;
ra = RA(given); rb = RB(given); rc = RC(given);
switch (OP_OPTYPE(given))
{
case 0x20: /* cpys */
if (ra == 31)
{
if (ra == rb)
{
if (rc == 31)
func (stream, "fnop");
else
func (stream, "fclr\tf%d", rc);
}
else
func (stream, "fmov\tf%d, f%d", rb, rc);
found = 1;
}
else
{
if (ra == 31) {
func (stream, "fabs\tf%d, f%d", rb, rc);
found = 1;
}
}
break;
case 0x21: /* cpysn */
if (ra == rb)
{
func (stream, "fneg\tf%d, f%d", rb, rc);
found = 1;
}
default:
;
}
if (!found)
func (stream, "%s\tf%d, f%d, f%d", insn->name, ra, rb, rc);
found = 1;
}
break;
case PAL_FORMAT_CODE:
if (insn->i == given)
{
func (stream, "call_pal %s", insn->name);
found = 1;
}
break;
case FLOAT_MEMORY_FORMAT_CODE:
if ((insn->i & MEMORY_FORMAT_MASK)
==(given & MEMORY_FORMAT_MASK))
{
func (stream, "%s\tf%d, %d(%s)",
insn->name,
RA(given),
OPCODE (given) == 9 ? DISP(given) * 65536 : DISP(given),
alpha_regs[RB(given)]);
found = 1;
}
break;
case FLOAT_BRANCH_FORMAT_CODE:
if ((insn->i & BRANCH_FORMAT_MASK)
== (given & BRANCH_FORMAT_MASK))
{
func (stream, "%s\tf%d, ",
insn->name,
RA(given));
(*info->print_address_func) (BDISP(given) * 4 + pc + 4, info);
found = 1;
}
break;
}
}
if (!found)
switch (OPCODE (given))
{
case 0x00:
func (stream, "call_pal 0x%x", given);
break;
case 0x19:
case 0x1b:
case 0x1d:
case 0x1e:
case 0x1f:
func (stream, "PAL%X 0x%x", OPCODE (given), given & 0x3ffffff);
break;
case 0x01:
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x06:
case 0x07:
case 0x0a:
case 0x0c:
case 0x0d:
case 0x0e:
case 0x14:
case 0x1c:
func (stream, "OPC%02X 0x%x", OPCODE (given), given & 0x3ffffff);
break;
}
return 4;
}
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