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binutils-gdb/opcodes/msp430-dis.c

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/* Disassemble MSP430 instructions.
Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.
Contributed by Dmitry Diky <diwil@mail.ru>
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., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <sys/types.h>
#include "dis-asm.h"
#include "opintl.h"
#include "libiberty.h"
#define DASM_SECTION
#include "opcode/msp430.h"
#undef DASM_SECTION
#define PS(x) (0xffff & (x))
static unsigned short
msp430dis_opcode (bfd_vma addr, disassemble_info *info)
{
bfd_byte buffer[2];
int status;
status = info->read_memory_func (addr, buffer, 2, info);
if (status != 0)
{
info->memory_error_func (status, addr, info);
return -1;
}
return bfd_getl16 (buffer);
}
static int
msp430_nooperands (struct msp430_opcode_s *opcode,
bfd_vma addr ATTRIBUTE_UNUSED,
unsigned short insn ATTRIBUTE_UNUSED,
char *comm,
int *cycles)
{
/* Pop with constant. */
if (insn == 0x43b2)
return 0;
if (insn == opcode->bin_opcode)
return 2;
if (opcode->fmt == 0)
{
if ((insn & 0x0f00) != 3 || (insn & 0x0f00) != 2)
return 0;
strcpy (comm, "emulated...");
*cycles = 1;
}
else
{
strcpy (comm, "return from interupt");
*cycles = 5;
}
return 2;
}
static int
msp430_singleoperand (disassemble_info *info,
struct msp430_opcode_s *opcode,
bfd_vma addr,
unsigned short insn,
char *op,
char *comm,
int *cycles)
{
int regs = 0, regd = 0;
int ad = 0, as = 0;
int where = 0;
int cmd_len = 2;
short dst = 0;
regd = insn & 0x0f;
regs = (insn & 0x0f00) >> 8;
as = (insn & 0x0030) >> 4;
ad = (insn & 0x0080) >> 7;
switch (opcode->fmt)
{
case 0: /* Emulated work with dst register. */
if (regs != 2 && regs != 3 && regs != 1)
return 0;
/* Check if not clr insn. */
if (opcode->bin_opcode == 0x4300 && (ad || as))
return 0;
/* Check if really inc, incd insns. */
if ((opcode->bin_opcode & 0xff00) == 0x5300 && as == 3)
return 0;
if (ad == 0)
{
*cycles = 1;
/* Register. */
if (regd == 0)
{
*cycles += 1;
sprintf (op, "r0");
}
else if (regd == 1)
sprintf (op, "r1");
else if (regd == 2)
sprintf (op, "r2");
else
sprintf (op, "r%d", regd);
}
else /* ad == 1 msp430dis_opcode. */
{
if (regd == 0)
{
/* PC relative. */
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 2;
*cycles = 4;
sprintf (op, "0x%04x", dst);
sprintf (comm, "PC rel. abs addr 0x%04x",
PS ((short) (addr + 2) + dst));
}
else if (regd == 2)
{
/* Absolute. */
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 2;
*cycles = 4;
sprintf (op, "&0x%04x", PS (dst));
}
else
{
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 2;
*cycles = 4;
sprintf (op, "%d(r%d)", dst, regd);
}
}
break;
case 2: /* rrc, push, call, swpb, rra, sxt, push, call, reti etc... */
if (as == 0)
{
if (regd == 3)
{
/* Constsnts. */
sprintf (op, "#0");
sprintf (comm, "r3 As==00");
}
else
{
/* Register. */
sprintf (op, "r%d", regd);
}
*cycles = 1;
}
else if (as == 2)
{
*cycles = 1;
if (regd == 2)
{
sprintf (op, "#4");
sprintf (comm, "r2 As==10");
}
else if (regd == 3)
{
sprintf (op, "#2");
sprintf (comm, "r3 As==10");
}
else
{
*cycles = 3;
/* Indexed register mode @Rn. */
sprintf (op, "@r%d", regd);
}
}
else if (as == 3)
{
*cycles = 1;
if (regd == 2)
{
sprintf (op, "#8");
sprintf (comm, "r2 As==11");
}
else if (regd == 3)
{
sprintf (op, "#-1");
sprintf (comm, "r3 As==11");
}
else if (regd == 0)
{
*cycles = 3;
/* absolute. @pc+ */
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 2;
sprintf (op, "#%d", dst);
sprintf (comm, "#0x%04x", PS (dst));
}
else
{
*cycles = 3;
sprintf (op, "@r%d+", regd);
}
}
else if (as == 1)
{
*cycles = 4;
if (regd == 0)
{
/* PC relative. */
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 2;
sprintf (op, "0x%04x", PS (dst));
sprintf (comm, "PC rel. 0x%04x",
PS ((short) addr + 2 + dst));
}
else if (regd == 2)
{
/* Absolute. */
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 2;
sprintf (op, "&0x%04x", PS (dst));
}
else if (regd == 3)
{
*cycles = 1;
sprintf (op, "#1");
sprintf (comm, "r3 As==01");
}
else
{
/* Indexd. */
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 2;
sprintf (op, "%d(r%d)", dst, regd);
}
}
break;
case 3: /* Jumps. */
where = insn & 0x03ff;
if (where & 0x200)
where |= ~0x03ff;
if (where > 512 || where < -511)
return 0;
where *= 2;
sprintf (op, "$%+-8d", where + 2);
sprintf (comm, "abs 0x%x", PS ((short) (addr) + 2 + where));
*cycles = 2;
return 2;
break;
default:
cmd_len = 0;
}
return cmd_len;
}
static int
msp430_doubleoperand (disassemble_info *info,
struct msp430_opcode_s *opcode,
bfd_vma addr,
unsigned short insn,
char *op1,
char *op2,
char *comm1,
char *comm2,
int *cycles)
{
int regs = 0, regd = 0;
int ad = 0, as = 0;
int cmd_len = 2;
short dst = 0;
regd = insn & 0x0f;
regs = (insn & 0x0f00) >> 8;
as = (insn & 0x0030) >> 4;
ad = (insn & 0x0080) >> 7;
if (opcode->fmt == 0)
{
/* Special case: rla and rlc are the only 2 emulated instructions that
fall into two operand instructions. */
/* With dst, there are only:
Rm Register,
x(Rm) Indexed,
0xXXXX Relative,
&0xXXXX Absolute
emulated_ins dst
basic_ins dst, dst. */
if (regd != regs || as != ad)
return 0; /* May be 'data' section. */
if (ad == 0)
{
/* Register mode. */
if (regd == 3)
{
strcpy (comm1, _("Illegal as emulation instr"));
return -1;
}
sprintf (op1, "r%d", regd);
*cycles = 1;
}
else /* ad == 1 */
{
if (regd == 0)
{
/* PC relative, Symbolic. */
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 4;
*cycles = 6;
sprintf (op1, "0x%04x", PS (dst));
sprintf (comm1, "PC rel. 0x%04x",
PS ((short) addr + 2 + dst));
}
else if (regd == 2)
{
/* Absolute. */
dst = msp430dis_opcode (addr + 2, info);
/* If the 'src' field is not the same as the dst
then this is not an rla instruction. */
if (dst != msp430dis_opcode (addr + 4, info))
return 0;
cmd_len += 4;
*cycles = 6;
sprintf (op1, "&0x%04x", PS (dst));
}
else
{
/* Indexed. */
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 4;
*cycles = 6;
sprintf (op1, "%d(r%d)", dst, regd);
}
}
*op2 = 0;
*comm2 = 0;
return cmd_len;
}
/* Two operands exactly. */
if (ad == 0 && regd == 3)
{
/* R2/R3 are illegal as dest: may be data section. */
strcpy (comm1, _("Illegal as 2-op instr"));
return -1;
}
/* Source. */
if (as == 0)
{
*cycles = 1;
if (regs == 3)
{
/* Constsnts. */
sprintf (op1, "#0");
sprintf (comm1, "r3 As==00");
}
else
{
/* Register. */
sprintf (op1, "r%d", regs);
}
}
else if (as == 2)
{
*cycles = 1;
if (regs == 2)
{
sprintf (op1, "#4");
sprintf (comm1, "r2 As==10");
}
else if (regs == 3)
{
sprintf (op1, "#2");
sprintf (comm1, "r3 As==10");
}
else
{
*cycles = 2;
/* Indexed register mode @Rn. */
sprintf (op1, "@r%d", regs);
}
if (!regs)
*cycles = 3;
}
else if (as == 3)
{
if (regs == 2)
{
sprintf (op1, "#8");
sprintf (comm1, "r2 As==11");
*cycles = 1;
}
else if (regs == 3)
{
sprintf (op1, "#-1");
sprintf (comm1, "r3 As==11");
*cycles = 1;
}
else if (regs == 0)
{
*cycles = 3;
/* Absolute. @pc+. */
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 2;
sprintf (op1, "#%d", dst);
sprintf (comm1, "#0x%04x", PS (dst));
}
else
{
*cycles = 2;
sprintf (op1, "@r%d+", regs);
}
}
else if (as == 1)
{
if (regs == 0)
{
*cycles = 4;
/* PC relative. */
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 2;
sprintf (op1, "0x%04x", PS (dst));
sprintf (comm1, "PC rel. 0x%04x",
PS ((short) addr + 2 + dst));
}
else if (regs == 2)
{
*cycles = 2;
/* Absolute. */
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 2;
sprintf (op1, "&0x%04x", PS (dst));
sprintf (comm1, "0x%04x", PS (dst));
}
else if (regs == 3)
{
*cycles = 1;
sprintf (op1, "#1");
sprintf (comm1, "r3 As==01");
}
else
{
*cycles = 3;
/* Indexed. */
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 2;
sprintf (op1, "%d(r%d)", dst, regs);
}
}
/* Destination. Special care needed on addr + XXXX. */
if (ad == 0)
{
/* Register. */
if (regd == 0)
{
*cycles += 1;
sprintf (op2, "r0");
}
else if (regd == 1)
sprintf (op2, "r1");
else if (regd == 2)
sprintf (op2, "r2");
else
sprintf (op2, "r%d", regd);
}
else /* ad == 1. */
{
* cycles += 3;
if (regd == 0)
{
/* PC relative. */
*cycles += 1;
dst = msp430dis_opcode (addr + cmd_len, info);
sprintf (op2, "0x%04x", PS (dst));
sprintf (comm2, "PC rel. 0x%04x",
PS ((short) addr + cmd_len + dst));
cmd_len += 2;
}
else if (regd == 2)
{
/* Absolute. */
dst = msp430dis_opcode (addr + cmd_len, info);
cmd_len += 2;
sprintf (op2, "&0x%04x", PS (dst));
}
else
{
dst = msp430dis_opcode (addr + cmd_len, info);
cmd_len += 2;
sprintf (op2, "%d(r%d)", dst, regd);
}
}
return cmd_len;
}
static int
msp430_branchinstr (disassemble_info *info,
struct msp430_opcode_s *opcode ATTRIBUTE_UNUSED,
bfd_vma addr ATTRIBUTE_UNUSED,
unsigned short insn,
char *op1,
char *comm1,
int *cycles)
{
int regs = 0, regd = 0;
int ad = 0, as = 0;
int cmd_len = 2;
short dst = 0;
regd = insn & 0x0f;
regs = (insn & 0x0f00) >> 8;
as = (insn & 0x0030) >> 4;
ad = (insn & 0x0080) >> 7;
if (regd != 0) /* Destination register is not a PC. */
return 0;
/* dst is a source register. */
if (as == 0)
{
/* Constants. */
if (regs == 3)
{
*cycles = 1;
sprintf (op1, "#0");
sprintf (comm1, "r3 As==00");
}
else
{
/* Register. */
*cycles = 1;
sprintf (op1, "r%d", regs);
}
}
else if (as == 2)
{
if (regs == 2)
{
*cycles = 2;
sprintf (op1, "#4");
sprintf (comm1, "r2 As==10");
}
else if (regs == 3)
{
*cycles = 1;
sprintf (op1, "#2");
sprintf (comm1, "r3 As==10");
}
else
{
/* Indexed register mode @Rn. */
*cycles = 2;
sprintf (op1, "@r%d", regs);
}
}
else if (as == 3)
{
if (regs == 2)
{
*cycles = 1;
sprintf (op1, "#8");
sprintf (comm1, "r2 As==11");
}
else if (regs == 3)
{
*cycles = 1;
sprintf (op1, "#-1");
sprintf (comm1, "r3 As==11");
}
else if (regs == 0)
{
/* Absolute. @pc+ */
*cycles = 3;
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 2;
sprintf (op1, "#0x%04x", PS (dst));
}
else
{
*cycles = 2;
sprintf (op1, "@r%d+", regs);
}
}
else if (as == 1)
{
* cycles = 3;
if (regs == 0)
{
/* PC relative. */
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 2;
(*cycles)++;
sprintf (op1, "0x%04x", PS (dst));
sprintf (comm1, "PC rel. 0x%04x",
PS ((short) addr + 2 + dst));
}
else if (regs == 2)
{
/* Absolute. */
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 2;
sprintf (op1, "&0x%04x", PS (dst));
}
else if (regs == 3)
{
(*cycles)--;
sprintf (op1, "#1");
sprintf (comm1, "r3 As==01");
}
else
{
/* Indexd. */
dst = msp430dis_opcode (addr + 2, info);
cmd_len += 2;
sprintf (op1, "%d(r%d)", dst, regs);
}
}
return cmd_len;
}
int
print_insn_msp430 (bfd_vma addr, disassemble_info *info)
{
void *stream = info->stream;
fprintf_ftype prin = info->fprintf_func;
struct msp430_opcode_s *opcode;
char op1[32], op2[32], comm1[64], comm2[64];
int cmd_len = 0;
unsigned short insn;
int cycles = 0;
char *bc = "";
char dinfo[32]; /* Debug purposes. */
insn = msp430dis_opcode (addr, info);
sprintf (dinfo, "0x%04x", insn);
if (((int) addr & 0xffff) > 0xffdf)
{
(*prin) (stream, "interrupt service routine at 0x%04x", 0xffff & insn);
return 2;
}
*comm1 = 0;
*comm2 = 0;
for (opcode = msp430_opcodes; opcode->name; opcode++)
{
if ((insn & opcode->bin_mask) == opcode->bin_opcode
&& opcode->bin_opcode != 0x9300)
{
*op1 = 0;
*op2 = 0;
*comm1 = 0;
*comm2 = 0;
/* r0 as destination. Ad should be zero. */
if (opcode->insn_opnumb == 3 && (insn & 0x000f) == 0
&& (0x0080 & insn) == 0)
{
cmd_len =
msp430_branchinstr (info, opcode, addr, insn, op1, comm1,
&cycles);
if (cmd_len)
break;
}
switch (opcode->insn_opnumb)
{
case 0:
cmd_len = msp430_nooperands (opcode, addr, insn, comm1, &cycles);
break;
case 2:
cmd_len =
msp430_doubleoperand (info, opcode, addr, insn, op1, op2,
comm1, comm2, &cycles);
if (insn & BYTE_OPERATION)
bc = ".b";
break;
case 1:
cmd_len =
msp430_singleoperand (info, opcode, addr, insn, op1, comm1,
&cycles);
if (insn & BYTE_OPERATION && opcode->fmt != 3)
bc = ".b";
break;
default:
break;
}
}
if (cmd_len)
break;
}
dinfo[5] = 0;
if (cmd_len < 1)
{
/* Unknown opcode, or invalid combination of operands. */
(*prin) (stream, ".word 0x%04x; ????", PS (insn));
return 2;
}
(*prin) (stream, "%s%s", opcode->name, bc);
if (*op1)
(*prin) (stream, "\t%s", op1);
if (*op2)
(*prin) (stream, ",");
if (strlen (op1) < 7)
(*prin) (stream, "\t");
if (!strlen (op1))
(*prin) (stream, "\t");
if (*op2)
(*prin) (stream, "%s", op2);
if (strlen (op2) < 8)
(*prin) (stream, "\t");
if (*comm1 || *comm2)
(*prin) (stream, ";");
else if (cycles)
{
if (*op2)
(*prin) (stream, ";");
else
{
if (strlen (op1) < 7)
(*prin) (stream, ";");
else
(*prin) (stream, "\t;");
}
}
if (*comm1)
(*prin) (stream, "%s", comm1);
if (*comm1 && *comm2)
(*prin) (stream, ",");
if (*comm2)
(*prin) (stream, " %s", comm2);
return cmd_len;
}
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