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binutils-gdb/opcodes/crx-dis.c

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/* Disassembler code for CRX.
Copyright (C) 2004-2017 Free Software Foundation, Inc.
Contributed by Tomer Levi, NSC, Israel.
Written by Tomer Levi.
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/crx.h"
/* String to print when opcode was not matched. */
#define ILLEGAL "illegal"
/* Escape to 16-bit immediate. */
#define ESCAPE_16_BIT 0xE
/* Extract 'n_bits' from 'a' starting from offset 'offs'. */
#define EXTRACT(a, offs, n_bits) \
(n_bits == 32 ? (((a) >> (offs)) & 0xffffffffL) \
: (((a) >> (offs)) & ((1 << (n_bits)) -1)))
/* Set Bit Mask - a mask to set all bits starting from offset 'offs'. */
#define SBM(offs) ((((1 << (32 - offs)) -1) << (offs)))
typedef unsigned long dwordU;
typedef unsigned short wordU;
typedef struct
{
dwordU val;
int nbits;
} parameter;
/* Structure to hold valid 'cinv' instruction options. */
typedef struct
{
/* Cinv printed string. */
char *str;
/* Value corresponding to the string. */
unsigned int value;
}
cinv_entry;
/* CRX 'cinv' options. */
const cinv_entry crx_cinvs[] =
{
{"[i]", 2}, {"[i,u]", 3}, {"[d]", 4}, {"[d,u]", 5},
{"[d,i]", 6}, {"[d,i,u]", 7}, {"[b]", 8},
{"[b,i]", 10}, {"[b,i,u]", 11}, {"[b,d]", 12},
{"[b,d,u]", 13}, {"[b,d,i]", 14}, {"[b,d,i,u]", 15}
};
/* Enum to distinguish different registers argument types. */
typedef enum REG_ARG_TYPE
{
/* General purpose register (r<N>). */
REG_ARG = 0,
/* User register (u<N>). */
USER_REG_ARG,
/* CO-Processor register (c<N>). */
COP_ARG,
/* CO-Processor special register (cs<N>). */
COPS_ARG
}
REG_ARG_TYPE;
/* Number of valid 'cinv' instruction options. */
int NUMCINVS = ((sizeof crx_cinvs)/(sizeof crx_cinvs[0]));
/* Current opcode table entry we're disassembling. */
const inst *instruction;
/* Current instruction we're disassembling. */
ins currInsn;
/* The current instruction is read into 3 consecutive words. */
wordU words[3];
/* Contains all words in appropriate order. */
ULONGLONG allWords;
/* Holds the current processed argument number. */
int processing_argument_number;
/* Nonzero means a CST4 instruction. */
int cst4flag;
/* Nonzero means the instruction's original size is
incremented (escape sequence is used). */
int size_changed;
static int get_number_of_operands (void);
static argtype getargtype (operand_type);
static int getbits (operand_type);
static char *getregname (reg);
static char *getcopregname (copreg, reg_type);
static char * getprocregname (int);
static char *gettrapstring (unsigned);
static char *getcinvstring (unsigned);
static void getregliststring (int, char *, enum REG_ARG_TYPE);
static wordU get_word_at_PC (bfd_vma, struct disassemble_info *);
static void get_words_at_PC (bfd_vma, struct disassemble_info *);
static unsigned long build_mask (void);
static int powerof2 (int);
static int match_opcode (void);
static void make_instruction (void);
static void print_arguments (ins *, bfd_vma, struct disassemble_info *);
static void print_arg (argument *, bfd_vma, struct disassemble_info *);
/* Retrieve the number of operands for the current assembled instruction. */
static int
get_number_of_operands (void)
{
int i;
for (i = 0; instruction->operands[i].op_type && i < MAX_OPERANDS; i++)
;
return i;
}
/* Return the bit size for a given operand. */
static int
getbits (operand_type op)
{
if (op < MAX_OPRD)
return crx_optab[op].bit_size;
else
return 0;
}
/* Return the argument type of a given operand. */
static argtype
getargtype (operand_type op)
{
if (op < MAX_OPRD)
return crx_optab[op].arg_type;
else
return nullargs;
}
/* Given the trap index in dispatch table, return its name.
This routine is used when disassembling the 'excp' instruction. */
static char *
gettrapstring (unsigned int trap_index)
{
const trap_entry *trap;
for (trap = crx_traps; trap < crx_traps + NUMTRAPS; trap++)
if (trap->entry == trap_index)
return trap->name;
return ILLEGAL;
}
/* Given a 'cinv' instruction constant operand, return its corresponding string.
This routine is used when disassembling the 'cinv' instruction. */
static char *
getcinvstring (unsigned int num)
{
const cinv_entry *cinv;
for (cinv = crx_cinvs; cinv < (crx_cinvs + NUMCINVS); cinv++)
if (cinv->value == num)
return cinv->str;
return ILLEGAL;
}
/* Given a register enum value, retrieve its name. */
char *
getregname (reg r)
{
const reg_entry * regentry = &crx_regtab[r];
if (regentry->type != CRX_R_REGTYPE)
return ILLEGAL;
else
return regentry->name;
}
/* Given a coprocessor register enum value, retrieve its name. */
char *
getcopregname (copreg r, reg_type type)
{
const reg_entry * regentry;
if (type == CRX_C_REGTYPE)
regentry = &crx_copregtab[r];
else if (type == CRX_CS_REGTYPE)
regentry = &crx_copregtab[r+(cs0-c0)];
else
return ILLEGAL;
return regentry->name;
}
/* Getting a processor register name. */
static char *
getprocregname (int reg_index)
{
const reg_entry *r;
for (r = crx_regtab; r < crx_regtab + NUMREGS; r++)
if (r->image == reg_index)
return r->name;
return "ILLEGAL REGISTER";
}
/* Get the power of two for a given integer. */
static int
powerof2 (int x)
{
int product, i;
for (i = 0, product = 1; i < x; i++)
product *= 2;
return product;
}
/* Transform a register bit mask to a register list. */
void
getregliststring (int mask, char *string, enum REG_ARG_TYPE core_cop)
{
char temp_string[5];
int i;
string[0] = '{';
string[1] = '\0';
/* A zero mask means HI/LO registers. */
if (mask == 0)
{
if (core_cop == USER_REG_ARG)
strcat (string, "ulo,uhi");
else
strcat (string, "lo,hi");
}
else
{
for (i = 0; i < 16; i++)
{
if (mask & 0x1)
{
switch (core_cop)
{
case REG_ARG:
sprintf (temp_string, "r%d", i);
break;
case USER_REG_ARG:
sprintf (temp_string, "u%d", i);
break;
case COP_ARG:
sprintf (temp_string, "c%d", i);
break;
case COPS_ARG:
sprintf (temp_string, "cs%d", i);
break;
default:
break;
}
strcat (string, temp_string);
if (mask & 0xfffe)
strcat (string, ",");
}
mask >>= 1;
}
}
strcat (string, "}");
}
/* START and END are relating 'allWords' struct, which is 48 bits size.
START|--------|END
+---------+---------+---------+---------+
| | V | A | L |
+---------+---------+---------+---------+
0 16 32 48
words [0] [1] [2] */
static parameter
makelongparameter (ULONGLONG val, int start, int end)
{
parameter p;
p.val = (dwordU) EXTRACT(val, 48 - end, end - start);
p.nbits = end - start;
return p;
}
/* Build a mask of the instruction's 'constant' opcode,
based on the instruction's printing flags. */
static unsigned long
build_mask (void)
{
unsigned int print_flags;
unsigned long mask;
print_flags = instruction->flags & FMT_CRX;
switch (print_flags)
{
case FMT_1:
mask = 0xF0F00000;
break;
case FMT_2:
mask = 0xFFF0FF00;
break;
case FMT_3:
mask = 0xFFF00F00;
break;
case FMT_4:
mask = 0xFFF0F000;
break;
case FMT_5:
mask = 0xFFF0FFF0;
break;
default:
mask = SBM(instruction->match_bits);
break;
}
return mask;
}
/* Search for a matching opcode. Return 1 for success, 0 for failure. */
static int
match_opcode (void)
{
unsigned long mask;
/* The instruction 'constant' opcode doewsn't exceed 32 bits. */
unsigned long doubleWord = (words[1] + (words[0] << 16)) & 0xffffffff;
/* Start searching from end of instruction table. */
instruction = &crx_instruction[NUMOPCODES - 2];
/* Loop over instruction table until a full match is found. */
while (instruction >= crx_instruction)
{
mask = build_mask ();
if ((doubleWord & mask) == BIN(instruction->match, instruction->match_bits))
return 1;
else
instruction--;
}
return 0;
}
/* Set the proper parameter value for different type of arguments. */
static void
make_argument (argument * a, int start_bits)
{
int inst_bit_size, total_size;
parameter p;
if ((instruction->size == 3) && a->size >= 16)
inst_bit_size = 48;
else
inst_bit_size = 32;
switch (a->type)
{
case arg_copr:
case arg_copsr:
p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
inst_bit_size - start_bits);
a->cr = p.val;
break;
case arg_r:
p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
inst_bit_size - start_bits);
a->r = p.val;
break;
case arg_ic:
p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
inst_bit_size - start_bits);
if ((p.nbits == 4) && cst4flag)
{
if (IS_INSN_TYPE (CMPBR_INS) && (p.val == ESCAPE_16_BIT))
{
/* A special case, where the value is actually stored
in the last 4 bits. */
p = makelongparameter (allWords, 44, 48);
/* The size of the instruction should be incremented. */
size_changed = 1;
}
if (p.val == 6)
p.val = -1;
else if (p.val == 13)
p.val = 48;
else if (p.val == 5)
p.val = -4;
else if (p.val == 10)
p.val = 32;
else if (p.val == 11)
p.val = 20;
else if (p.val == 9)
p.val = 16;
}
a->constant = p.val;
break;
case arg_idxr:
a->scale = 0;
total_size = a->size + 10; /* sizeof(rbase + ridx + scl2) = 10. */
p = makelongparameter (allWords, inst_bit_size - total_size,
inst_bit_size - (total_size - 4));
a->r = p.val;
p = makelongparameter (allWords, inst_bit_size - (total_size - 4),
inst_bit_size - (total_size - 8));
a->i_r = p.val;
p = makelongparameter (allWords, inst_bit_size - (total_size - 8),
inst_bit_size - (total_size - 10));
a->scale = p.val;
p = makelongparameter (allWords, inst_bit_size - (total_size - 10),
inst_bit_size);
a->constant = p.val;
break;
case arg_rbase:
p = makelongparameter (allWords, inst_bit_size - (start_bits + 4),
inst_bit_size - start_bits);
a->r = p.val;
break;
case arg_cr:
if (a->size <= 8)
{
p = makelongparameter (allWords, inst_bit_size - (start_bits + 4),
inst_bit_size - start_bits);
a->r = p.val;
/* Case for opc4 r dispu rbase. */
p = makelongparameter (allWords, inst_bit_size - (start_bits + 8),
inst_bit_size - (start_bits + 4));
}
else
{
/* The 'rbase' start_bits is always relative to a 32-bit data type. */
p = makelongparameter (allWords, 32 - (start_bits + 4),
32 - start_bits);
a->r = p.val;
p = makelongparameter (allWords, 32 - start_bits,
inst_bit_size);
}
if ((p.nbits == 4) && cst4flag)
{
if (instruction->flags & DISPUW4)
p.val *= 2;
else if (instruction->flags & DISPUD4)
p.val *= 4;
}
a->constant = p.val;
break;
case arg_c:
p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
inst_bit_size - start_bits);
a->constant = p.val;
break;
default:
break;
}
}
/* Print a single argument. */
static void
print_arg (argument *a, bfd_vma memaddr, struct disassemble_info *info)
{
LONGLONG longdisp, mask;
int sign_flag = 0;
int relative = 0;
bfd_vma number;
int op_index = 0;
char string[200];
PTR stream = info->stream;
fprintf_ftype func = info->fprintf_func;
switch (a->type)
{
case arg_copr:
func (stream, "%s", getcopregname (a->cr, CRX_C_REGTYPE));
break;
case arg_copsr:
func (stream, "%s", getcopregname (a->cr, CRX_CS_REGTYPE));
break;
case arg_r:
if (IS_INSN_MNEMONIC ("mtpr") || IS_INSN_MNEMONIC ("mfpr"))
func (stream, "%s", getprocregname (a->r));
else
func (stream, "%s", getregname (a->r));
break;
case arg_ic:
if (IS_INSN_MNEMONIC ("excp"))
func (stream, "%s", gettrapstring (a->constant));
else if (IS_INSN_MNEMONIC ("cinv"))
func (stream, "%s", getcinvstring (a->constant));
else if (INST_HAS_REG_LIST)
{
REG_ARG_TYPE reg_arg_type = IS_INSN_TYPE (COP_REG_INS) ?
COP_ARG : IS_INSN_TYPE (COPS_REG_INS) ?
COPS_ARG : (instruction->flags & USER_REG) ?
USER_REG_ARG : REG_ARG;
if ((reg_arg_type == COP_ARG) || (reg_arg_type == COPS_ARG))
{
/* Check for proper argument number. */
if (processing_argument_number == 2)
{
getregliststring (a->constant, string, reg_arg_type);
func (stream, "%s", string);
}
else
func (stream, "$0x%lx", a->constant & 0xffffffff);
}
else
{
getregliststring (a->constant, string, reg_arg_type);
func (stream, "%s", string);
}
}
else
func (stream, "$0x%lx", a->constant & 0xffffffff);
break;
case arg_idxr:
func (stream, "0x%lx(%s,%s,%d)", a->constant & 0xffffffff,
getregname (a->r), getregname (a->i_r), powerof2 (a->scale));
break;
case arg_rbase:
func (stream, "(%s)", getregname (a->r));
break;
case arg_cr:
func (stream, "0x%lx(%s)", a->constant & 0xffffffff, getregname (a->r));
if (IS_INSN_TYPE (LD_STOR_INS_INC))
func (stream, "+");
break;
case arg_c:
/* Removed the *2 part as because implicit zeros are no more required.
Have to fix this as this needs a bit of extension in terms of branchins.
Have to add support for cmp and branch instructions. */
if (IS_INSN_TYPE (BRANCH_INS) || IS_INSN_MNEMONIC ("bal")
|| IS_INSN_TYPE (CMPBR_INS) || IS_INSN_TYPE (DCR_BRANCH_INS)
|| IS_INSN_TYPE (COP_BRANCH_INS))
{
relative = 1;
longdisp = a->constant;
longdisp <<= 1;
switch (a->size)
{
case 8:
case 16:
case 24:
case 32:
mask = ((LONGLONG)1 << a->size) - 1;
if (longdisp & ((LONGLONG)1 << a->size))
{
sign_flag = 1;
longdisp = ~(longdisp) + 1;
}
a->constant = (unsigned long int) (longdisp & mask);
break;
default:
func (stream,
"Wrong offset used in branch/bal instruction");
break;
}
}
/* For branch Neq instruction it is 2*offset + 2. */
else if (IS_INSN_TYPE (BRANCH_NEQ_INS))
a->constant = 2 * a->constant + 2;
else if (IS_INSN_TYPE (LD_STOR_INS_INC)
|| IS_INSN_TYPE (LD_STOR_INS)
|| IS_INSN_TYPE (STOR_IMM_INS)
|| IS_INSN_TYPE (CSTBIT_INS))
{
op_index = instruction->flags & REVERSE_MATCH ? 0 : 1;
if (instruction->operands[op_index].op_type == abs16)
a->constant |= 0xFFFF0000;
}
func (stream, "%s", "0x");
number = (relative ? memaddr : 0)
+ (sign_flag ? -a->constant : a->constant);
(*info->print_address_func) (number, info);
break;
default:
break;
}
}
/* Print all the arguments of CURRINSN instruction. */
static void
print_arguments (ins *currentInsn, bfd_vma memaddr, struct disassemble_info *info)
{
int i;
for (i = 0; i < currentInsn->nargs; i++)
{
processing_argument_number = i;
print_arg (&currentInsn->arg[i], memaddr, info);
if (i != currentInsn->nargs - 1)
info->fprintf_func (info->stream, ", ");
}
}
/* Build the instruction's arguments. */
static void
make_instruction (void)
{
int i;
unsigned int shift;
for (i = 0; i < currInsn.nargs; i++)
{
argument a;
memset (&a, 0, sizeof (a));
a.type = getargtype (instruction->operands[i].op_type);
if (instruction->operands[i].op_type == cst4
|| instruction->operands[i].op_type == rbase_dispu4)
cst4flag = 1;
a.size = getbits (instruction->operands[i].op_type);
shift = instruction->operands[i].shift;
make_argument (&a, shift);
currInsn.arg[i] = a;
}
/* Calculate instruction size (in bytes). */
currInsn.size = instruction->size + (size_changed ? 1 : 0);
/* Now in bits. */
currInsn.size *= 2;
}
/* Retrieve a single word from a given memory address. */
static wordU
get_word_at_PC (bfd_vma memaddr, struct disassemble_info *info)
{
bfd_byte buffer[4];
int status;
wordU insn = 0;
status = info->read_memory_func (memaddr, buffer, 2, info);
if (status == 0)
insn = (wordU) bfd_getl16 (buffer);
return insn;
}
/* Retrieve multiple words (3) from a given memory address. */
static void
get_words_at_PC (bfd_vma memaddr, struct disassemble_info *info)
{
int i;
bfd_vma mem;
for (i = 0, mem = memaddr; i < 3; i++, mem += 2)
words[i] = get_word_at_PC (mem, info);
allWords =
((ULONGLONG) words[0] << 32) + ((unsigned long) words[1] << 16) + words[2];
}
/* Prints the instruction by calling print_arguments after proper matching. */
int
print_insn_crx (bfd_vma memaddr, struct disassemble_info *info)
{
int is_decoded; /* Nonzero means instruction has a match. */
/* Initialize global variables. */
cst4flag = 0;
size_changed = 0;
/* Retrieve the encoding from current memory location. */
get_words_at_PC (memaddr, info);
/* Find a matching opcode in table. */
is_decoded = match_opcode ();
/* If found, print the instruction's mnemonic and arguments. */
if (is_decoded > 0 && (words[0] != 0 || words[1] != 0))
{
info->fprintf_func (info->stream, "%s", instruction->mnemonic);
if ((currInsn.nargs = get_number_of_operands ()) != 0)
info->fprintf_func (info->stream, "\t");
make_instruction ();
print_arguments (&currInsn, memaddr, info);
return currInsn.size;
}
/* No match found. */
info->fprintf_func (info->stream,"%s ",ILLEGAL);
return 2;
}
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