/* TI C6X disassembler.

/* TI C6X disassembler.
Copyright (C) 2010-2024 Free Software Foundation, Inc.
Contributed by Joseph Myers <[email protected]>
Bernd Schmidt <[email protected]>

This file is part of libopcodes.

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 of the License, 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 "disassemble.h"
#include "opcode/tic6x.h"
#include "libiberty.h"

/* Define the instruction format table. */
const tic6x_insn_format tic6x_insn_format_table[tic6x_insn_format_max] =
{
#define FMT(name, num_bits, cst_bits, mask, fields) \
{ num_bits, cst_bits, mask, fields },
#include "opcode/tic6x-insn-formats.h"
#undef FMT
};

/* Define the control register table. */
const tic6x_ctrl tic6x_ctrl_table[tic6x_ctrl_max] =
{
#define CTRL(name, isa, rw, crlo, crhi_mask) \
{ \
STRINGX(name), \
CONCAT2(TIC6X_INSN_,isa), \
CONCAT2(tic6x_rw_,rw), \
crlo, \
crhi_mask \
},
#include "opcode/tic6x-control-registers.h"
#undef CTRL
};

/* Define the opcode table. */
const tic6x_opcode tic6x_opcode_table[tic6x_opcode_max] =
{
#define INSNU(name, func_unit, format, type, isa, flags, fixed, ops, var) \
{ \
STRINGX(name), \
CONCAT2(tic6x_func_unit_,func_unit), \
CONCAT3(tic6x_insn_format,_,format), \
CONCAT2(tic6x_pipeline_,type), \
CONCAT2(TIC6X_INSN_,isa), \
flags, \
fixed, \
ops, \
var \
},
#define INSNUE(name, e, func_unit, format, type, isa, flags, fixed, ops, var) \
{ \
STRINGX(name), \
CONCAT2(tic6x_func_unit_,func_unit), \
CONCAT3(tic6x_insn_format,_,format), \
CONCAT2(tic6x_pipeline_,type), \
CONCAT2(TIC6X_INSN_,isa), \
flags, \
fixed, \
ops, \
var \
},
#define INSN(name, func_unit, format, type, isa, flags, fixed, ops, var) \
{ \
STRINGX(name), \
CONCAT2(tic6x_func_unit_,func_unit), \
CONCAT4(tic6x_insn_format_,func_unit,_,format), \
CONCAT2(tic6x_pipeline_,type), \
CONCAT2(TIC6X_INSN_,isa), \
flags, \
fixed, \
ops, \
var \
},
#define INSNE(name, e, func_unit, format, type, isa, flags, fixed, ops, var) \
{ \
STRINGX(name), \
CONCAT2(tic6x_func_unit_,func_unit), \
CONCAT4(tic6x_insn_format_,func_unit,_,format), \
CONCAT2(tic6x_pipeline_,type), \
CONCAT2(TIC6X_INSN_,isa), \
flags, \
fixed, \
ops, \
var \
},
#include "opcode/tic6x-opcode-table.h"
#undef INSN
#undef INSNE
#undef INSNU
#undef INSNUE
};

/* If instruction format FMT has a field FIELD, return a pointer to
the description of that field; otherwise return NULL. */

const tic6x_insn_field *
tic6x_field_from_fmt (const tic6x_insn_format *fmt, tic6x_insn_field_id field)
{
unsigned int f;

for (f = 0; f < fmt->num_fields; f++)
if (fmt->fields[f].field_id == field)
return &fmt->fields[f];

return NULL;
}

/* Extract the field width. */

static unsigned int
tic6x_field_width (const tic6x_insn_field *field)
{
unsigned int i;
unsigned int width = 0;

if (!field->num_bitfields)
return field->bitfields[0].width;

for (i = 0 ; i < field->num_bitfields ; i++)
width += field->bitfields[i].width;

return width;
}

/* Extract the bits corresponding to FIELD from OPCODE. */

static unsigned int
tic6x_field_bits (unsigned int opcode, const tic6x_insn_field *field)
{
unsigned int i;
unsigned int val = 0;

if (!field->num_bitfields)
return (opcode >> field->bitfields[0].low_pos) & ((1u << field->bitfields[0].width) - 1);

for (i = 0 ; i < field->num_bitfields ; i++)
val |= ((opcode >> field->bitfields[i].low_pos) & ((1u << field->bitfields[i].width) - 1))
<< field->bitfields[i].pos;

return val;
}

/* Extract a 32-bit value read from the instruction stream. */

static unsigned int
tic6x_extract_32 (unsigned char *p, struct disassemble_info *info)
{
if (info->endian == BFD_ENDIAN_LITTLE)
return p[0] | (p[1] << 8) | (p[2] << 16) | ((unsigned) p[3] << 24);
else
return p[3] | (p[2] << 8) | (p[1] << 16) | ((unsigned) p[0] << 24);
}

/* Extract a 16-bit value read from the instruction stream. */

static unsigned int
tic6x_extract_16 (unsigned char *p, tic6x_fetch_packet_header *header,
struct disassemble_info *info)
{
unsigned int op16;

if (info->endian == BFD_ENDIAN_LITTLE)
op16 = (p[0]) | (p[1] << 8);
else
op16 = (p[1]) | (p[0] << 8);
op16 |= (header->sat << TIC6X_COMPACT_SAT_POS);
op16 |= (header->br << TIC6X_COMPACT_BR_POS);
op16 |= (header->dsz << TIC6X_COMPACT_DSZ_POS);
return op16;
}

/* FP points to a fetch packet. Return whether it is header-based; if
it is, fill in HEADER. */

static bool
tic6x_check_fetch_packet_header (unsigned char *fp,
tic6x_fetch_packet_header *header,
struct disassemble_info *info)
{
int i;

header->header = tic6x_extract_32 (fp + 28, info);

if ((header->header & 0xf0000000) != 0xe0000000)
{
header->prot = 0;
header->rs = 0;
header->dsz = 0;
header->br = 0;
header->sat = 0;
for (i = 0; i < 7; i++)
header->word_compact[i] = false;
for (i = 0; i < 14; i++)
header->p_bits[i] = false;
return false;
}

for (i = 0; i < 7; i++)
header->word_compact[i]
= (header->header & (1u << (21 + i))) != 0;

header->prot = (header->header & (1u << 20)) != 0;
header->rs = (header->header & (1u << 19)) != 0;
header->dsz = (header->header >> 16) & 0x7;
header->br = (header->header & (1u << 15)) != 0;
header->sat = (header->header & (1u << 14)) != 0;

for (i = 0; i < 14; i++)
header->p_bits[i] = (header->header & (1u << i)) != 0;

return true;
}

/* Disassemble the instruction at ADDR and print it using
INFO->FPRINTF_FUNC and INFO->STREAM, returning the number of bytes
consumed. */

int
print_insn_tic6x (bfd_vma addr, struct disassemble_info *info)
{
int status;
bfd_vma fp_addr;
bfd_vma fp_offset;
unsigned char fp[32];
unsigned int opcode;
tic6x_opcode_id opcode_id;
bool fetch_packet_header_based;
tic6x_fetch_packet_header header;
unsigned int num_bits;
bool bad_offset = false;

fp_offset = addr & 0x1f;
fp_addr = addr - fp_offset;
/* Read in a block of instructions. Since there might be a
symbol in the middle of this block, disable stop_vma. */
info->stop_vma = 0;
status = info->read_memory_func (fp_addr, fp, 32, info);
if (status)
{
info->memory_error_func (status, addr, info);
return -1;
}

fetch_packet_header_based
= tic6x_check_fetch_packet_header (fp, &header, info);
if (fetch_packet_header_based)
{
if (fp_offset & 0x1)
bad_offset = true;
if ((fp_offset & 0x3) && (fp_offset >= 28
|| !header.word_compact[fp_offset >> 2]))
bad_offset = true;
if (fp_offset == 28)
{
info->bytes_per_chunk = 4;
info->fprintf_func (info->stream, "<fetch packet header 0x%.8x>",
header.header);
return 4;
}
num_bits = (header.word_compact[fp_offset >> 2] ? 16 : 32);
}
else
{
num_bits = 32;
if (fp_offset & 0x3)
bad_offset = true;
}

if (bad_offset)
{
info->bytes_per_chunk = 1;
info->fprintf_func (info->stream, ".byte 0x%.2x", fp[fp_offset]);
return 1;
}

if (num_bits == 16)
{
/* The least-significant part of a 32-bit word comes logically
before the most-significant part. For big-endian, follow the
TI assembler in showing instructions in logical order by
pretending that the two halves of the word are in opposite
locations to where they actually are. */
if (info->endian == BFD_ENDIAN_LITTLE)
opcode = tic6x_extract_16 (fp + fp_offset, &header, info);
else
opcode = tic6x_extract_16 (fp + (fp_offset ^ 2), &header, info);
}
else
opcode = tic6x_extract_32 (fp + fp_offset, info);

for (opcode_id = 0; opcode_id < tic6x_opcode_max; opcode_id++)
{
const tic6x_opcode *const opc = &tic6x_opcode_table[opcode_id];
const tic6x_insn_format *const fmt
= &tic6x_insn_format_table[opc->format];
const tic6x_insn_field *creg_field;
bool p_bit;
const char *parallel;
const char *cond = "";
const char *func_unit;
char func_unit_buf[8];
unsigned int func_unit_side = 0;
unsigned int func_unit_data_side = 0;
unsigned int func_unit_cross = 0;
unsigned int t_val = 0;
/* The maximum length of the text of a non-PC-relative operand
is 24 bytes (SPMASK masking all eight functional units, with
separating commas and trailing NUL). */
char operands[TIC6X_MAX_OPERANDS][24] = { { 0 } };
bfd_vma operands_addresses[TIC6X_MAX_OPERANDS] = { 0 };
bool operands_text[TIC6X_MAX_OPERANDS] = { false };
bool operands_pcrel[TIC6X_MAX_OPERANDS] = { false };
unsigned int fix;
unsigned int num_operands;
unsigned int op_num;
bool fixed_ok;
bool operands_ok;
bool have_t = false;

if (opc->flags & TIC6X_FLAG_MACRO)
continue;
if (fmt->num_bits != num_bits)
continue;
if ((opcode & fmt->mask) != fmt->cst_bits)
continue;

/* If the format has a creg field, it is only a candidate for a
match if the creg and z fields have values indicating a valid
condition; reserved values indicate either an instruction
format without a creg field, or an invalid instruction. */
creg_field = tic6x_field_from_fmt (fmt, tic6x_field_creg);
if (creg_field)
{
const tic6x_insn_field *z_field;
unsigned int creg_value, z_value;
static const char *const conds[8][2] =
{
{ "", NULL },
{ "[b0] ", "[!b0] " },
{ "[b1] ", "[!b1] " },
{ "[b2] ", "[!b2] " },
{ "[a1] ", "[!a1] " },
{ "[a2] ", "[!a2] " },
{ "[a0] ", "[!a0] " },
{ NULL, NULL }
};

/* A creg field is not meaningful without a z field, so if
the z field is not present this is an error in the format
table. */
z_field = tic6x_field_from_fmt (fmt, tic6x_field_z);
if (!z_field)
{
printf ("*** opcode %x: missing z field", opcode);
abort ();
}

creg_value = tic6x_field_bits (opcode, creg_field);
z_value = tic6x_field_bits (opcode, z_field);
cond = conds[creg_value][z_value];
if (cond == NULL)
continue;
}

if (opc->flags & TIC6X_FLAG_INSN16_SPRED)
{
const tic6x_insn_field *cc_field;
unsigned int s_value = 0;
unsigned int z_value = 0;
bool cond_known = false;
static const char *const conds[2][2] =
{
{ "[a0] ", "[!a0] " },
{ "[b0] ", "[!b0] " }
};

cc_field = tic6x_field_from_fmt (fmt, tic6x_field_cc);

if (cc_field)
{
unsigned int cc_value;

cc_value = tic6x_field_bits (opcode, cc_field);
s_value = (cc_value & 0x2) >> 1;
z_value = (cc_value & 0x1);
cond_known = true;
}
else
{
const tic6x_insn_field *z_field;
const tic6x_insn_field *s_field;

s_field = tic6x_field_from_fmt (fmt, tic6x_field_s);

if (!s_field)
{
printf ("opcode %x: missing compact insn predicate register field (s field)\n",
opcode);
abort ();
}
s_value = tic6x_field_bits (opcode, s_field);
z_field = tic6x_field_from_fmt (fmt, tic6x_field_z);
if (!z_field)
{
printf ("opcode %x: missing compact insn predicate z_value (z field)\n", opcode);
abort ();
}

z_value = tic6x_field_bits (opcode, z_field);
cond_known = true;
}

if (!cond_known)
{
printf ("opcode %x: unspecified ompact insn predicate\n", opcode);
abort ();
}
cond = conds[s_value][z_value];
}

/* All fixed fields must have matching values; all fields with
restricted ranges must have values within those ranges. */
fixed_ok = true;
for (fix = 0; fix < opc->num_fixed_fields; fix++)
{
unsigned int field_bits;
const tic6x_insn_field *const field
= tic6x_field_from_fmt (fmt, opc->fixed_fields[fix].field_id);

if (!field)
{
printf ("opcode %x: missing field #%d for FIX #%d\n",
opcode, opc->fixed_fields[fix].field_id, fix);
abort ();
}

field_bits = tic6x_field_bits (opcode, field);
if (field_bits < opc->fixed_fields[fix].min_val
|| field_bits > opc->fixed_fields[fix].max_val)
{
fixed_ok = false;
break;
}
}
if (!fixed_ok)
continue;

/* The instruction matches. */

/* The p-bit indicates whether this instruction is in parallel
with the *next* instruction, whereas the parallel bars
indicate the instruction is in parallel with the *previous*
instruction. Thus, we must find the p-bit for the previous
instruction. */
if (num_bits == 16 && (fp_offset & 0x2) == 2)
{
/* This is the logically second (most significant; second in
fp_offset terms because fp_offset relates to logical not
physical addresses) instruction of a compact pair; find
the p-bit for the first (least significant). */
p_bit = header.p_bits[(fp_offset >> 2) << 1];
}
else if (fp_offset >= 4)
{
/* Find the last instruction of the previous word in this
fetch packet. For compact instructions, this is the most
significant 16 bits. */
if (fetch_packet_header_based
&& header.word_compact[(fp_offset >> 2) - 1])
p_bit = header.p_bits[(fp_offset >> 1) - 1];
else
{
unsigned int prev_opcode
= tic6x_extract_32 (fp + (fp_offset & 0x1c) - 4, info);
p_bit = (prev_opcode & 0x1) != 0;
}
}
else
{
/* Find the last instruction of the previous fetch
packet. */
unsigned char fp_prev[32];

status = info->read_memory_func (fp_addr - 32, fp_prev, 32, info);
if (status)
/* No previous instruction to be parallel with. */
p_bit = false;
else
{
bool prev_header_based;
tic6x_fetch_packet_header prev_header;

prev_header_based
= tic6x_check_fetch_packet_header (fp_prev, &prev_header, info);
if (prev_header_based)
{
if (prev_header.word_compact[6])
p_bit = prev_header.p_bits[13];
else
{
unsigned int prev_opcode = tic6x_extract_32 (fp_prev + 24,
info);
p_bit = (prev_opcode & 0x1) != 0;
}
}
else
{
unsigned int prev_opcode = tic6x_extract_32 (fp_prev + 28,
info);
p_bit = (prev_opcode & 0x1) != 0;
}
}
}
parallel = p_bit ? "|| " : "";

if (opc->func_unit == tic6x_func_unit_nfu)
func_unit = "";
else
{
unsigned int fld_num;
char func_unit_char;
const char *data_str;
bool have_areg = false;
bool have_cross = false;

func_unit_side = (opc->flags & TIC6X_FLAG_SIDE_B_ONLY) ? 2 : 0;
func_unit_cross = 0;
func_unit_data_side = (opc->flags & TIC6X_FLAG_SIDE_T2_ONLY) ? 2 : 0;

for (fld_num = 0; fld_num < opc->num_variable_fields; fld_num++)
{
const tic6x_coding_field *const enc = &opc->variable_fields[fld_num];
const tic6x_insn_field *field;
unsigned int fld_val;

field = tic6x_field_from_fmt (fmt, enc->field_id);

if (!field)
{
printf ("opcode %x: could not retrieve field (field_id:%d)\n",
opcode, fld_num);
abort ();
}

fld_val = tic6x_field_bits (opcode, field);

switch (enc->coding_method)
{
case tic6x_coding_fu:
/* The side must be specified exactly once. */
if (func_unit_side)
{
printf ("opcode %x: field #%d use tic6x_coding_fu, but func_unit_side is already set!\n",
opcode, fld_num);
abort ();
}
func_unit_side = (fld_val ? 2 : 1);
break;

case tic6x_coding_data_fu:
/* The data side must be specified exactly once. */
if (func_unit_data_side)
{
printf ("opcode %x: field #%d use tic6x_coding_fu, but func_unit_side is already set!\n",
opcode, fld_num);
abort ();
}
func_unit_data_side = (fld_val ? 2 : 1);
break;

case tic6x_coding_xpath:
/* Cross path use must be specified exactly
once. */
if (have_cross)
{
printf ("opcode %x: field #%d use tic6x_coding_xpath, have_cross is already set!\n",
opcode, fld_num);
abort ();
}
have_cross = true;
func_unit_cross = fld_val;
break;

case tic6x_coding_rside:
/* If the format has a t field, use it for src/dst register side. */
have_t = true;
t_val = fld_val;
func_unit_data_side = (t_val ? 2 : 1);
break;

case tic6x_coding_areg:
have_areg = true;
break;

default:
/* Don't relate to functional units. */
break;
}
}

/* The side of the functional unit used must now have been
determined either from the flags or from an instruction
field. */
if (func_unit_side != 1 && func_unit_side != 2)
{
printf ("opcode %x: func_unit_side is not encoded!\n", opcode);
abort ();
}

/* Cross paths are not applicable when sides are specified
for both address and data paths. */
if (func_unit_data_side && have_cross)
{
printf ("opcode %x: xpath not applicable when side are specified both for address and data!\n",
opcode);
abort ();
}

/* Separate address and data paths are only applicable for
the D unit. */
if (func_unit_data_side && opc->func_unit != tic6x_func_unit_d)
{
printf ("opcode %x: separate address and data paths only applicable for D unit!\n",
opcode);
abort ();
}

/* If an address register is being used but in ADDA rather
than a load or store, it uses a cross path for side-A
instructions, and the cross path use is not specified by
an instruction field. */
if (have_areg && !func_unit_data_side)
{
if (have_cross)
{
printf ("opcode %x: illegal cross path specifier in adda opcode!\n", opcode);
abort ();
}
func_unit_cross = func_unit_side == 1;
}

switch (opc->func_unit)
{
case tic6x_func_unit_d:
func_unit_char = 'D';
break;

case tic6x_func_unit_l:
func_unit_char = 'L';
break;

case tic6x_func_unit_m:
func_unit_char = 'M';
break;

case tic6x_func_unit_s:
func_unit_char = 'S';
break;

default:
printf ("opcode %x: illegal func_unit specifier %d\n", opcode, opc->func_unit);
abort ();
}

switch (func_unit_data_side)
{
case 0:
data_str = "";
break;

case 1:
data_str = "T1";
break;

case 2:
data_str = "T2";
break;

default:
printf ("opcode %x: illegal data func_unit specifier %d\n",
opcode, func_unit_data_side);
abort ();
}

if (opc->flags & TIC6X_FLAG_INSN16_BSIDE && func_unit_side == 1)
func_unit_cross = 1;

snprintf (func_unit_buf, sizeof func_unit_buf, " .%c%u%s%s",
func_unit_char, func_unit_side,
(func_unit_cross ? "X" : ""), data_str);
func_unit = func_unit_buf;
}

/* For each operand there must be one or more fields set based
on that operand, that can together be used to derive the
operand value. */
operands_ok = true;
num_operands = opc->num_operands;
for (op_num = 0; op_num < num_operands; op_num++)
{
unsigned int fld_num;
unsigned int mem_base_reg = 0;
bool mem_base_reg_known = false;
bool mem_base_reg_known_long = false;
unsigned int mem_offset = 0;
bool mem_offset_known = false;
bool mem_offset_known_long = false;
unsigned int mem_mode = 0;
bool mem_mode_known = false;
unsigned int mem_scaled = 0;
bool mem_scaled_known = false;
unsigned int crlo = 0;
bool crlo_known = false;
unsigned int crhi = 0;
bool crhi_known = false;
bool spmask_skip_operand = false;
unsigned int fcyc_bits = 0;
bool prev_sploop_found = false;

switch (opc->operand_info[op_num].form)
{
case tic6x_operand_b15reg:
/* Fully determined by the functional unit. */
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "b15");
continue;

case tic6x_operand_zreg:
/* Fully determined by the functional unit. */
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "%c0",
(func_unit_side == 2 ? 'b' : 'a'));
continue;

case tic6x_operand_retreg:
/* Fully determined by the functional unit. */
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "%c3",
(func_unit_side == 2 ? 'b' : 'a'));
continue;

case tic6x_operand_irp:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "irp");
continue;

case tic6x_operand_nrp:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "nrp");
continue;

case tic6x_operand_ilc:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "ilc");
continue;

case tic6x_operand_hw_const_minus_1:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "-1");
continue;

case tic6x_operand_hw_const_0:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "0");
continue;

case tic6x_operand_hw_const_1:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "1");
continue;

case tic6x_operand_hw_const_5:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "5");
continue;

case tic6x_operand_hw_const_16:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "16");
continue;

case tic6x_operand_hw_const_24:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "24");
continue;

case tic6x_operand_hw_const_31:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "31");
continue;

default:
break;
}

for (fld_num = 0; fld_num < opc->num_variable_fields; fld_num++)
{
const tic6x_coding_field *const enc
= &opc->variable_fields[fld_num];
const tic6x_insn_field *field;
unsigned int fld_val;
unsigned int reg_base = 0;
signed int signed_fld_val;
char reg_side = '?';

if (enc->operand_num != op_num)
continue;
field = tic6x_field_from_fmt (fmt, enc->field_id);
if (!field)
{
printf ("opcode %x: missing field (field_id:%d) in format\n", opcode, enc->field_id);
abort ();
}
fld_val = tic6x_field_bits (opcode, field);
switch (enc->coding_method)
{
case tic6x_coding_cst_s3i:
(fld_val == 0x00) && (fld_val = 0x10);
(fld_val == 0x07) && (fld_val = 0x08);
/* Fall through. */
case tic6x_coding_ucst:
case tic6x_coding_ulcst_dpr_byte:
case tic6x_coding_ulcst_dpr_half:
case tic6x_coding_ulcst_dpr_word:
case tic6x_coding_lcst_low16:
switch (opc->operand_info[op_num].form)
{
case tic6x_operand_asm_const:
case tic6x_operand_link_const:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "%u", fld_val);
break;

case tic6x_operand_mem_long:
mem_offset = fld_val;
mem_offset_known_long = true;
break;

default:
printf ("opcode %x: illegal operand form for operand#%d\n", opcode, op_num);
abort ();
}
break;

case tic6x_coding_lcst_high16:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "%u", fld_val << 16);
break;

case tic6x_coding_scst_l3i:
operands_text[op_num] = true;
if (fld_val == 0)
{
signed_fld_val = 8;
}
else
{
signed_fld_val = (signed int) fld_val;
signed_fld_val ^= (1 << (tic6x_field_width (field) - 1));
signed_fld_val -= (1 << (tic6x_field_width (field) - 1));
}
snprintf (operands[op_num], 24, "%d", signed_fld_val);
break;

case tic6x_coding_scst:
operands_text[op_num] = true;
signed_fld_val = (signed int) fld_val;
signed_fld_val ^= (1 << (tic6x_field_width (field) - 1));
signed_fld_val -= (1 << (tic6x_field_width (field) - 1));
snprintf (operands[op_num], 24, "%d", signed_fld_val);
break;

case tic6x_coding_ucst_minus_one:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "%u", fld_val + 1);
break;

case tic6x_coding_pcrel:
case tic6x_coding_pcrel_half:
signed_fld_val = (signed int) fld_val;
signed_fld_val ^= (1 << (tic6x_field_width (field) - 1));
signed_fld_val -= (1 << (tic6x_field_width (field) - 1));
if (fetch_packet_header_based
&& enc->coding_method == tic6x_coding_pcrel_half)
signed_fld_val *= 2;
else
signed_fld_val *= 4;
operands_pcrel[op_num] = true;
operands_addresses[op_num] = fp_addr + signed_fld_val;
break;

case tic6x_coding_regpair_msb:
if (opc->operand_info[op_num].form != tic6x_operand_regpair)
abort ();
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "%c%u:%c%u",
(func_unit_side == 2 ? 'b' : 'a'), (fld_val | 0x1),
(func_unit_side == 2 ? 'b' : 'a'), (fld_val | 0x1) - 1);
break;

case tic6x_coding_pcrel_half_unsigned:
operands_pcrel[op_num] = true;
operands_addresses[op_num] = fp_addr + 2 * fld_val;
break;

case tic6x_coding_reg_shift:
fld_val <<= 1;
/* Fall through. */
case tic6x_coding_reg:
if (num_bits == 16 && header.rs && !(opc->flags & TIC6X_FLAG_INSN16_NORS))
{
reg_base = 16;
}
switch (opc->operand_info[op_num].form)
{
case tic6x_operand_treg:
if (!have_t)
{
printf ("opcode %x: operand treg but missing t field\n", opcode);
abort ();
}
operands_text[op_num] = true;
reg_side = t_val ? 'b' : 'a';
snprintf (operands[op_num], 24, "%c%u", reg_side, reg_base + fld_val);
break;

case tic6x_operand_reg:
operands_text[op_num] = true;
reg_side = (func_unit_side == 2) ? 'b' : 'a';
snprintf (operands[op_num], 24, "%c%u", reg_side, reg_base + fld_val);
break;

case tic6x_operand_reg_nors:
operands_text[op_num] = true;
reg_side = (func_unit_side == 2) ? 'b' : 'a';
snprintf (operands[op_num], 24, "%c%u", reg_side, fld_val);
break;

case tic6x_operand_reg_bside:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "b%u", reg_base + fld_val);
break;

case tic6x_operand_reg_bside_nors:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "b%u", fld_val);
break;

case tic6x_operand_xreg:
operands_text[op_num] = true;
reg_side = ((func_unit_side == 2) ^ func_unit_cross) ? 'b' : 'a';
snprintf (operands[op_num], 24, "%c%u", reg_side, reg_base + fld_val);
break;

case tic6x_operand_dreg:
operands_text[op_num] = true;
reg_side = (func_unit_data_side == 2) ? 'b' : 'a';
snprintf (operands[op_num], 24, "%c%u", reg_side, reg_base + fld_val);
break;

case tic6x_operand_regpair:
operands_text[op_num] = true;
if (fld_val & 1)
operands_ok = false;
reg_side = (func_unit_side == 2) ? 'b' : 'a';
snprintf (operands[op_num], 24, "%c%u:%c%u",
reg_side, reg_base + fld_val + 1,
reg_side, reg_base + fld_val);
break;

case tic6x_operand_xregpair:
operands_text[op_num] = true;
if (fld_val & 1)
operands_ok = false;
reg_side = ((func_unit_side == 2) ^ func_unit_cross) ? 'b' : 'a';
snprintf (operands[op_num], 24, "%c%u:%c%u",
reg_side, reg_base + fld_val + 1,
reg_side, reg_base + fld_val);
break;

case tic6x_operand_tregpair:
if (!have_t)
{
printf ("opcode %x: operand tregpair but missing t field\n", opcode);
abort ();
}
operands_text[op_num] = true;
if (fld_val & 1)
operands_ok = false;
reg_side = t_val ? 'b' : 'a';
snprintf (operands[op_num], 24, "%c%u:%c%u",
reg_side, reg_base + fld_val + 1,
reg_side, reg_base + fld_val);
break;

case tic6x_operand_dregpair:
operands_text[op_num] = true;
if (fld_val & 1)
operands_ok = false;
reg_side = (func_unit_data_side) == 2 ? 'b' : 'a';
snprintf (operands[op_num], 24, "%c%u:%c%u",
reg_side, reg_base + fld_val + 1,
reg_side, reg_base + fld_val);
break;

case tic6x_operand_mem_deref:
operands_text[op_num] = true;
reg_side = func_unit_side == 2 ? 'b' : 'a';
snprintf (operands[op_num], 24, "*%c%u", reg_side, reg_base + fld_val);
break;

case tic6x_operand_mem_short:
case tic6x_operand_mem_ndw:
mem_base_reg = fld_val;
mem_base_reg_known = true;
break;

default:
printf ("opcode %x: unexpected operand form %d for operand #%d",
opcode, opc->operand_info[op_num].form, op_num);
abort ();
}
break;

case tic6x_coding_reg_ptr:
switch (opc->operand_info[op_num].form)
{
case tic6x_operand_mem_short:
case tic6x_operand_mem_ndw:
if (fld_val > 0x3u)
{
printf("opcode %x: illegal field value for ptr register of operand #%d (%d)",
opcode, op_num, fld_val);
abort ();
}
mem_base_reg = 0x4 | fld_val;
mem_base_reg_known = true;
break;

default:
printf ("opcode %x: unexpected operand form %d for operand #%d",
opcode, opc->operand_info[op_num].form, op_num);
abort ();
}
break;

case tic6x_coding_areg:
switch (opc->operand_info[op_num].form)
{
case tic6x_operand_areg:
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "b%u",
fld_val ? 15u : 14u);
break;

case tic6x_operand_mem_long:
mem_base_reg = fld_val ? 15u : 14u;
mem_base_reg_known_long = true;
break;

default:
printf ("opcode %x: bad operand form\n", opcode);
abort ();
}
break;

case tic6x_coding_mem_offset_minus_one_noscale:
case tic6x_coding_mem_offset_minus_one:
fld_val += 1;
/* Fall through. */
case tic6x_coding_mem_offset_noscale:
case tic6x_coding_mem_offset:
mem_offset = fld_val;
mem_offset_known = true;
if (num_bits == 16)
{
mem_mode_known = true;
mem_mode = TIC6X_INSN16_MEM_MODE_VAL (opc->flags);
mem_scaled_known = true;
mem_scaled = true;
if (opc->flags & TIC6X_FLAG_INSN16_B15PTR)
{
mem_base_reg_known = true;
mem_base_reg = 15;
}
if ( enc->coding_method == tic6x_coding_mem_offset_noscale
|| enc->coding_method == tic6x_coding_mem_offset_noscale )
mem_scaled = false;
}
break;

case tic6x_coding_mem_mode:
mem_mode = fld_val;
mem_mode_known = true;
break;

case tic6x_coding_scaled:
mem_scaled = fld_val;
mem_scaled_known = true;
break;

case tic6x_coding_crlo:
crlo = fld_val;
crlo_known = true;
break;

case tic6x_coding_crhi:
crhi = fld_val;
crhi_known = true;
break;

case tic6x_coding_fstg:
case tic6x_coding_fcyc:
if (!prev_sploop_found)
{
bfd_vma search_fp_addr = fp_addr;
bfd_vma search_fp_offset = fp_offset;
bool search_fp_header_based
= fetch_packet_header_based;
tic6x_fetch_packet_header search_fp_header = header;
unsigned char search_fp[32];
unsigned int search_num_bits;
unsigned int search_opcode;
unsigned int sploop_ii = 0;
int i;

memcpy (search_fp, fp, 32);

/* To interpret these bits in an SPKERNEL
instruction, we must find the previous
SPLOOP-family instruction. It may come up to
48 execute packets earlier. */
for (i = 0; i < 48 * 8; i++)
{
/* Find the previous instruction. */
if (search_fp_offset & 2)
search_fp_offset -= 2;
else if (search_fp_offset >= 4)
{
if (search_fp_header_based
&& (search_fp_header.word_compact
[(search_fp_offset >> 2) - 1]))
search_fp_offset -= 2;
else
search_fp_offset -= 4;
}
else
{
search_fp_addr -= 32;
status = info->read_memory_func (search_fp_addr,
search_fp,
32, info);
if (status)
/* No previous SPLOOP instruction. */
break;
search_fp_header_based
= (tic6x_check_fetch_packet_header
(search_fp, &search_fp_header, info));
if (search_fp_header_based)
search_fp_offset
= search_fp_header.word_compact[6] ? 26 : 24;
else
search_fp_offset = 28;
}

/* Extract the previous instruction. */
if (search_fp_header_based)
search_num_bits
= (search_fp_header.word_compact[search_fp_offset
>> 2]
? 16
: 32);
else
search_num_bits = 32;
if (search_num_bits == 16)
{
if (info->endian == BFD_ENDIAN_LITTLE)
search_opcode
= (tic6x_extract_16
(search_fp + search_fp_offset, &header, info));
else
search_opcode
= (tic6x_extract_16
(search_fp + (search_fp_offset ^ 2), &header,
info));
}
else
search_opcode
= tic6x_extract_32 (search_fp + search_fp_offset,
info);

/* Check whether it is an SPLOOP-family
instruction. */
if (search_num_bits == 32
&& ((search_opcode & 0x003ffffe) == 0x00038000
|| (search_opcode & 0x003ffffe) == 0x0003a000
|| ((search_opcode & 0x003ffffe)
== 0x0003e000)))
{
prev_sploop_found = true;
sploop_ii = ((search_opcode >> 23) & 0x1f) + 1;
}
else if (search_num_bits == 16
&& (search_opcode & 0x3c7e) == 0x0c66)
{
prev_sploop_found = true;
sploop_ii
= (((search_opcode >> 7) & 0x7)
| ((search_opcode >> 11) & 0x8)) + 1;
}
if (prev_sploop_found)
{
if (sploop_ii <= 0)
{
printf ("opcode %x: sloop index not found (%d)\n", opcode, sploop_ii);
abort ();
}
else if (sploop_ii <= 1)
fcyc_bits = 0;
else if (sploop_ii <= 2)
fcyc_bits = 1;
else if (sploop_ii <= 4)
fcyc_bits = 2;
else if (sploop_ii <= 8)
fcyc_bits = 3;
else if (sploop_ii <= 14)
fcyc_bits = 4;
else
prev_sploop_found = false;
}
if (prev_sploop_found)
break;
}
}
if (!prev_sploop_found)
{
operands_ok = false;
operands_text[op_num] = true;
break;
}
if (fcyc_bits > tic6x_field_width(field))
{
printf ("opcode %x: illegal fcyc value (%d)\n", opcode, fcyc_bits);
abort ();
}
if (enc->coding_method == tic6x_coding_fstg)
{
int i, t;
for (t = 0, i = fcyc_bits; i < 6; i++)
t = (t << 1) | ((fld_val >> i) & 1);
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "%u", t);
}
else
{
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "%u",
fld_val & ((1 << fcyc_bits) - 1));
}
break;

case tic6x_coding_spmask:
if (fld_val == 0)
spmask_skip_operand = true;
else
{
char *p;
unsigned int i;

operands_text[op_num] = true;
p = operands[op_num];
for (i = 0; i < 8; i++)
if (fld_val & (1 << i))
{
*p++ = "LSDM"[i/2];
*p++ = '1' + (i & 1);
*p++ = ',';
}
p[-1] = 0;
}
break;

case tic6x_coding_fu:
case tic6x_coding_data_fu:
case tic6x_coding_xpath:
case tic6x_coding_rside:
/* Don't relate to operands, so operand number is
meaningless. */
break;

default:
printf ("opcode %x: illegal field encoding (%d)\n", opcode, enc->coding_method);
abort ();
}

if (mem_base_reg_known_long && mem_offset_known_long)
{
if (operands_text[op_num] || operands_pcrel[op_num])
{
printf ("opcode %x: long access but operands already known ?\n", opcode);
abort ();
}
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "*+b%u(%u)", mem_base_reg,
mem_offset * opc->operand_info[op_num].size);
}

if (mem_base_reg_known && mem_offset_known && mem_mode_known
&& (mem_scaled_known
|| (opc->operand_info[op_num].form
!= tic6x_operand_mem_ndw)))
{
char side;
char base[4];
bool offset_is_reg;
bool offset_scaled;
char offset[4];
char offsetp[6];

if (operands_text[op_num] || operands_pcrel[op_num])
{
printf ("opcode %x: mem access operands already known ?\n", opcode);
abort ();
}

side = func_unit_side == 2 ? 'b' : 'a';
snprintf (base, 4, "%c%u", side, mem_base_reg);

offset_is_reg = (mem_mode & 4) != 0;
if (offset_is_reg)
{

if (num_bits == 16 && header.rs && !(opc->flags & TIC6X_FLAG_INSN16_NORS))
{
reg_base = 16;
}
snprintf (offset, 4, "%c%u", side, reg_base + mem_offset);
if (opc->operand_info[op_num].form
== tic6x_operand_mem_ndw)
offset_scaled = mem_scaled != 0;
else
offset_scaled = true;
}
else
{
if (opc->operand_info[op_num].form
== tic6x_operand_mem_ndw)
{
offset_scaled = mem_scaled != 0;
snprintf (offset, 4, "%u", mem_offset);
}
else
{
offset_scaled = false;
snprintf (offset, 4, "%u",
(mem_offset
* opc->operand_info[op_num].size));
}
}

if (offset_scaled)
snprintf (offsetp, 6, "[%s]", offset);
else
snprintf (offsetp, 6, "(%s)", offset);

operands_text[op_num] = true;
switch (mem_mode & ~4u)
{
case 0:
snprintf (operands[op_num], 24, "*-%s%s", base, offsetp);
break;

case 1:
snprintf (operands[op_num], 24, "*+%s%s", base, offsetp);
break;

case 2:
case 3:
operands_ok = false;
break;

case 8:
snprintf (operands[op_num], 24, "*--%s%s", base,
offsetp);
break;

case 9:
snprintf (operands[op_num], 24, "*++%s%s", base,
offsetp);
break;

case 10:
snprintf (operands[op_num], 24, "*%s--%s", base,
offsetp);
break;

case 11:
snprintf (operands[op_num], 24, "*%s++%s", base,
offsetp);
break;

default:
printf ("*** unknown mem_mode : %d \n", mem_mode);
abort ();
}
}

if (crlo_known && crhi_known)
{
tic6x_rw rw;
tic6x_ctrl_id crid;

if (operands_text[op_num] || operands_pcrel[op_num])
{
printf ("*** abort crlo crli\n");
abort ();
}

rw = opc->operand_info[op_num].rw;
if (rw != tic6x_rw_read
&& rw != tic6x_rw_write)
{
printf ("*** abort rw : %d\n", rw);
abort ();
}

for (crid = 0; crid < tic6x_ctrl_max; crid++)
{
if (crlo == tic6x_ctrl_table[crid].crlo
&& (crhi & tic6x_ctrl_table[crid].crhi_mask) == 0
&& (rw == tic6x_rw_read
? (tic6x_ctrl_table[crid].rw == tic6x_rw_read
|| (tic6x_ctrl_table[crid].rw
== tic6x_rw_read_write))
: (tic6x_ctrl_table[crid].rw == tic6x_rw_write
|| (tic6x_ctrl_table[crid].rw
== tic6x_rw_read_write))))
break;
}
if (crid == tic6x_ctrl_max)
{
operands_text[op_num] = true;
operands_ok = false;
}
else
{
operands_text[op_num] = true;
snprintf (operands[op_num], 24, "%s",
tic6x_ctrl_table[crid].name);
}
}

if (operands_text[op_num] || operands_pcrel[op_num]
|| spmask_skip_operand)
break;
}
/* end for fld_num */

if (spmask_skip_operand)
{
/* SPMASK operands are only valid as the single operand
in the opcode table. */
if (num_operands != 1)
{
printf ("opcode: %x, num_operands != 1 : %d\n", opcode, num_operands);
abort ();
}
num_operands = 0;
break;
}

/* The operand must by now have been decoded. */
if (!operands_text[op_num] && !operands_pcrel[op_num])
{
printf ("opcode: %x, operand #%d not decoded\n", opcode, op_num);
abort ();
}
}
/* end for op_num */

if (!operands_ok)
continue;

info->bytes_per_chunk = num_bits / 8;
info->fprintf_func (info->stream, "%s", parallel);
info->fprintf_func (info->stream, "%s%s%s", cond, opc->name,
func_unit);
for (op_num = 0; op_num < num_operands; op_num++)
{
info->fprintf_func (info->stream, "%c", (op_num == 0 ? ' ' : ','));
if (operands_pcrel[op_num])
info->print_address_func (operands_addresses[op_num], info);
else
info->fprintf_func (info->stream, "%s", operands[op_num]);
}
if (fetch_packet_header_based && header.prot)
info->fprintf_func (info->stream, " || nop 5");

return num_bits / 8;
}

info->bytes_per_chunk = num_bits / 8;
info->fprintf_func (info->stream, "<undefined instruction 0x%.*x>",
(int) num_bits / 4, opcode);
return num_bits / 8;
}