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binutils-gdb/opcodes/cr16-dis.c
Nick Clifton 3d3d428f04 New port: National Semiconductor's CR16
2007-06-29 14:09:34 +00:00

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/* Disassembler code for CR16.
Copyright 2007 Free Software Foundation, Inc.
Contributed by M R Swami Reddy (MR.Swami.Reddy@nsc.com).
This file is part of GAS, GDB and the GNU binutils.
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, 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 "dis-asm.h"
#include "sysdep.h"
#include "opcode/cr16.h"
#include "libiberty.h"
/* String to print when opcode was not matched. */
#define ILLEGAL "illegal"
/* Escape to 16-bit immediate. */
#define ESCAPE_16_BIT 0xB
/* 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 map valid 'cinv' instruction options. */
typedef struct
{
/* Cinv printed string. */
char *istr;
/* Value corresponding to the string. */
char *ostr;
}
cinv_entry;
/* CR16 'cinv' options mapping. */
const cinv_entry cr16_cinvs[] =
{
{"cinv[i]", "cinv [i]"},
{"cinv[i,u]", "cinv [i,u]"},
{"cinv[d]", "cinv [d]"},
{"cinv[d,u]", "cinv [d,u]"},
{"cinv[d,i]", "cinv [d,i]"},
{"cinv[d,i,u]", "cinv [d,i,u]"}
};
/* Number of valid 'cinv' instruction options. */
static int NUMCINVS = ARRAY_SIZE (cr16_cinvs);
/* Enum to distinguish different registers argument types. */
typedef enum REG_ARG_TYPE
{
/* General purpose register (r<N>). */
REG_ARG = 0,
/*Processor register */
P_ARG,
}
REG_ARG_TYPE;
/* 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 IMM4 instruction. */
int imm4flag;
/* Nonzero means the instruction's original size is
incremented (escape sequence is used). */
int size_changed;
/* Print the constant expression length. */
static char *
print_exp_len (int size)
{
switch (size)
{
case 4:
case 5:
case 6:
case 8:
case 14:
case 16:
return ":s";
case 20:
case 24:
case 32:
return ":m";
case 48:
return ":l";
default:
return "";
}
}
/* 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 cr16_optab[op].bit_size;
return 0;
}
/* Return the argument type of a given operand. */
static argtype
getargtype (operand_type op)
{
if (op < MAX_OPRD)
return cr16_optab[op].arg_type;
return nullargs;
}
/* Given a 'CC' instruction constant operand, return its corresponding
string. This routine is used when disassembling the 'CC' instruction. */
static char *
getccstring (unsigned cc)
{
return (char *) cr16_b_cond_tab[cc];
}
/* Given a 'cinv' instruction constant operand, return its corresponding
string. This routine is used when disassembling the 'cinv' instruction. */
static char *
getcinvstring (char *str)
{
const cinv_entry *cinv;
for (cinv = cr16_cinvs; cinv < (cr16_cinvs + NUMCINVS); cinv++)
if (strcmp (cinv->istr, str) == 0)
return cinv->ostr;
return ILLEGAL;
}
/* Given the trap index in dispatch table, return its name.
This routine is used when disassembling the 'excp' instruction. */
static char *
gettrapstring (unsigned int index)
{
const trap_entry *trap;
for (trap = cr16_traps; trap < cr16_traps + NUMTRAPS; trap++)
if (trap->entry == index)
return trap->name;
return ILLEGAL;
}
/* Given a register enum value, retrieve its name. */
static char *
getregname (reg r)
{
const reg_entry *reg = cr16_regtab + r;
if (reg->type != CR16_R_REGTYPE)
return ILLEGAL;
return reg->name;
}
/* Given a register pair enum value, retrieve its name. */
static char *
getregpname (reg r)
{
const reg_entry *reg = cr16_regptab + r;
if (reg->type != CR16_RP_REGTYPE)
return ILLEGAL;
return reg->name;
}
/* Given a index register pair enum value, retrieve its name. */
static char *
getidxregpname (reg r)
{
const reg_entry *reg;
switch (r)
{
case 0: r = 0; break;
case 1: r = 2; break;
case 2: r = 4; break;
case 3: r = 6; break;
case 4: r = 8; break;
case 5: r = 10; break;
case 6: r = 3; break;
case 7: r = 5; break;
default:
break;
}
reg = cr16_regptab + r;
if (reg->type != CR16_RP_REGTYPE)
return ILLEGAL;
return reg->name;
}
/* Getting a processor register name. */
static char *
getprocregname (int index)
{
const reg_entry *r;
for (r = cr16_pregtab; r < cr16_pregtab + NUMPREGS; r++)
if (r->image == index)
return r->name;
return "ILLEGAL REGISTER";
}
/* Getting a processor register name - 32 bit size. */
static char *
getprocpregname (int index)
{
const reg_entry *r;
for (r = cr16_pregptab; r < cr16_pregptab + NUMPREGPS; r++)
if (r->image == index)
return r->name;
return "ILLEGAL REGISTER";
}
/* 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 long mask = SBM (instruction->match_bits);
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);
/* Start searching from end of instruction table. */
instruction = &cr16_instruction[NUMOPCODES - 2];
/* Loop over instruction table until a full match is found. */
while (instruction >= cr16_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;
parameter p;
if ((instruction->size == 3) && a->size >= 16)
inst_bit_size = 48;
else
inst_bit_size = 32;
switch (a->type)
{
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_rp:
p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
inst_bit_size - start_bits);
a->rp = p.val;
break;
case arg_pr:
p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
inst_bit_size - start_bits);
a->pr = p.val;
break;
case arg_prp:
p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
inst_bit_size - start_bits);
a->prp = p.val;
break;
case arg_ic:
p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
inst_bit_size - start_bits);
a->constant = p.val;
break;
case arg_cc:
p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
inst_bit_size - start_bits);
a->cc = p.val;
break;
case arg_idxr:
if ((IS_INSN_MNEMONIC ("cbitb"))
|| (IS_INSN_MNEMONIC ("sbitb"))
|| (IS_INSN_MNEMONIC ("tbitb")))
p = makelongparameter (allWords, 8, 9);
else
p = makelongparameter (allWords, 9, 10);
a->i_r = p.val;
p = makelongparameter (allWords, inst_bit_size - a->size, inst_bit_size);
a->constant = p.val;
break;
case arg_idxrp:
p = makelongparameter (allWords, start_bits + 12, start_bits + 13);
a->i_r = p.val;
p = makelongparameter (allWords, start_bits + 13, start_bits + 16);
a->rp = p.val;
if (inst_bit_size > 32)
{
p = makelongparameter (allWords, inst_bit_size - start_bits - 12,
inst_bit_size);
a->constant = ((p.val & 0xffff) | (p.val >> 8 & 0xf0000));
}
else if (instruction->size == 2)
{
p = makelongparameter (allWords, inst_bit_size - 22, inst_bit_size);
a->constant = (p.val & 0xf) | (((p.val >>20) & 0x3) << 4)
| ((p.val >>14 & 0x3) << 6) | (((p.val >>7) & 0x1f) <<7);
}
else if (instruction->size == 1 && a->size == 0)
a->constant = 0;
break;
case arg_rbase:
p = makelongparameter (allWords, inst_bit_size, inst_bit_size);
a->constant = p.val;
p = makelongparameter (allWords, inst_bit_size - (start_bits + 4),
inst_bit_size - start_bits);
a->r = p.val;
break;
case arg_cr:
p = makelongparameter (allWords, start_bits + 12, start_bits + 16);
a->r = p.val;
p = makelongparameter (allWords, inst_bit_size - 16, inst_bit_size);
a->constant = p.val;
break;
case arg_crp:
if (instruction->size == 1)
p = makelongparameter (allWords, 12, 16);
else
p = makelongparameter (allWords, start_bits + 12, start_bits + 16);
a->rp = p.val;
if (inst_bit_size > 32)
{
p = makelongparameter (allWords, inst_bit_size - start_bits - 12,
inst_bit_size);
a->constant = ((p.val & 0xffff) | (p.val >> 8 & 0xf0000));
}
else if (instruction->size == 2)
{
p = makelongparameter (allWords, inst_bit_size - 16, inst_bit_size);
a->constant = p.val;
}
else if (instruction->size == 1 && a->size != 0)
{
p = makelongparameter (allWords, 4, 8);
if (IS_INSN_MNEMONIC ("loadw")
|| IS_INSN_MNEMONIC ("loadd")
|| IS_INSN_MNEMONIC ("storw")
|| IS_INSN_MNEMONIC ("stord"))
a->constant = (p.val * 2);
else
a->constant = p.val;
}
else /* below case for 0x0(reg pair) */
a->constant = 0;
break;
case arg_c:
if ((IS_INSN_TYPE (BRANCH_INS))
|| (IS_INSN_MNEMONIC ("bal"))
|| (IS_INSN_TYPE (CSTBIT_INS))
|| (IS_INSN_TYPE (LD_STOR_INS)))
{
switch (a->size)
{
case 8 :
p = makelongparameter (allWords, 0, start_bits);
a->constant = ((((p.val&0xf00)>>4)) | (p.val&0xf));
break;
case 24:
if (instruction->size == 3)
{
p = makelongparameter (allWords, 16, inst_bit_size);
a->constant = ((((p.val>>16)&0xf) << 20)
| (((p.val>>24)&0xf) << 16)
| (p.val & 0xffff));
}
else if (instruction->size == 2)
{
p = makelongparameter (allWords, 8, inst_bit_size);
a->constant = p.val;
}
break;
default:
p = makelongparameter (allWords, inst_bit_size - (start_bits +
a->size), inst_bit_size - start_bits);
a->constant = p.val;
break;
}
}
else
{
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;
PTR stream = info->stream;
fprintf_ftype func = info->fprintf_func;
switch (a->type)
{
case arg_r:
func (stream, "%s", getregname (a->r));
break;
case arg_rp:
func (stream, "%s", getregpname (a->rp));
break;
case arg_pr:
func (stream, "%s", getprocregname (a->pr));
break;
case arg_prp:
func (stream, "%s", getprocpregname (a->prp));
break;
case arg_cc:
func (stream, "%s", getccstring (a->cc));
func (stream, "%s", "\t");
break;
case arg_ic:
if (IS_INSN_MNEMONIC ("excp"))
{
func (stream, "%s", gettrapstring (a->constant));
break;
}
else if ((IS_INSN_TYPE (ARITH_INS) || IS_INSN_TYPE (ARITH_BYTE_INS))
&& ((instruction->size == 1) && (a->constant == 9)))
func (stream, "$%d", -1);
else if (INST_HAS_REG_LIST)
func (stream, "$0x%lx", a->constant +1);
else if (IS_INSN_TYPE (SHIFT_INS))
{
longdisp = a->constant;
mask = ((LONGLONG)1 << a->size) - 1;
if (longdisp & ((LONGLONG)1 << (a->size -1)))
{
sign_flag = 1;
longdisp = ~(longdisp) + 1;
}
a->constant = (unsigned long int) (longdisp & mask);
func (stream, "$%d", ((int)(sign_flag ? -a->constant :
a->constant)));
}
else
func (stream, "$0x%lx", a->constant);
switch (a->size)
{
case 4 : case 5 : case 6 : case 8 :
func (stream, "%s", ":s"); break;
case 16 : case 20 : func (stream, "%s", ":m"); break;
case 24 : case 32 : func (stream, "%s", ":l"); break;
default: break;
}
break;
case arg_idxr:
if (a->i_r == 0) func (stream, "[r12]");
if (a->i_r == 1) func (stream, "[r13]");
func (stream, "0x%lx", a->constant);
func (stream, "%s", print_exp_len (instruction->size * 16));
break;
case arg_idxrp:
if (a->i_r == 0) func (stream, "[r12]");
if (a->i_r == 1) func (stream, "[r13]");
func (stream, "0x%lx", a->constant);
func (stream, "%s", print_exp_len (instruction->size * 16));
func (stream, "%s", getidxregpname (a->rp));
break;
case arg_rbase:
func (stream, "(%s)", getregname (a->r));
break;
case arg_cr:
func (stream, "0x%lx", a->constant);
func (stream, "%s", print_exp_len (instruction->size * 16));
func (stream, "(%s)", getregname (a->r));
break;
case arg_crp:
func (stream, "0x%lx", a->constant);
func (stream, "%s", print_exp_len (instruction->size * 16));
func (stream, "%s", getregpname (a->rp));
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 branch
instructions. */
if (IS_INSN_TYPE (BRANCH_INS) || IS_INSN_MNEMONIC ("bal"))
{
relative = 1;
longdisp = a->constant;
/* REVISIT: To sync with WinIDEA and CR16 4.1tools, the below
line commented */
/* longdisp <<= 1; */
mask = ((LONGLONG)1 << a->size) - 1;
switch (a->size)
{
case 8 :
{
longdisp <<= 1;
if (longdisp & ((LONGLONG)1 << a->size))
{
sign_flag = 1;
longdisp = ~(longdisp) + 1;
}
break;
}
case 16 :
case 24 :
{
if (longdisp & 1)
{
sign_flag = 1;
longdisp = ~(longdisp) + 1;
}
break;
}
default:
func (stream, "Wrong offset used in branch/bal instruction");
break;
}
a->constant = (unsigned long int) (longdisp & mask);
}
/* For branch Neq instruction it is 2*offset + 2. */
else if (IS_INSN_TYPE (BRANCH_NEQ_INS))
a->constant = 2 * a->constant + 2;
if ((!IS_INSN_TYPE (CSTBIT_INS)) && (!IS_INSN_TYPE (LD_STOR_INS)))
(sign_flag) ? func (stream, "%s", "*-"): func (stream, "%s","*+");
func (stream, "%s", "0x");
number = ((relative ? memaddr : 0) +
(sign_flag ? ((- a->constant) & 0xffffffe) : a->constant));
(*info->print_address_func) ((number & ((1 << 24) - 1)), info);
func (stream, "%s", print_exp_len (instruction->size * 16));
break;
default:
break;
}
}
/* Print all the arguments of CURRINSN instruction. */
static void
print_arguments (ins *currInsn, bfd_vma memaddr, struct disassemble_info *info)
{
int i;
/* For "pop/push/popret RA instruction only. */
if ((IS_INSN_MNEMONIC ("pop")
|| (IS_INSN_MNEMONIC ("popret")
|| (IS_INSN_MNEMONIC ("push"))))
&& currInsn->nargs == 1)
{
info->fprintf_func (info->stream, "RA");
return;
}
for (i = 0; i < currInsn->nargs; i++)
{
processing_argument_number = i;
/* For "bal (ra), disp17" instruction only. */
if ((IS_INSN_MNEMONIC ("bal")) && (i == 0) && instruction->size == 2)
{
info->fprintf_func (info->stream, "(ra),");
continue;
}
if ((INST_HAS_REG_LIST) && (i == 2))
info->fprintf_func (info->stream, "RA");
else
print_arg (&currInsn->arg[i], memaddr, info);
if ((i != currInsn->nargs - 1) && (!IS_INSN_MNEMONIC ("b")))
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);
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_cr16 (bfd_vma memaddr, struct disassemble_info *info)
{
int is_decoded; /* Nonzero means instruction has a match. */
/* Initialize global variables. */
imm4flag = 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] << 16 || words[1]) != 0)
{
if (strneq (instruction->mnemonic, "cinv", 4))
info->fprintf_func (info->stream,"%s", getcinvstring ((char *)instruction->mnemonic));
else
info->fprintf_func (info->stream, "%s", instruction->mnemonic);
if (((currInsn.nargs = get_number_of_operands ()) != 0)
&& ! (IS_INSN_MNEMONIC ("b")))
info->fprintf_func (info->stream, "\t");
make_instruction ();
/* For push/pop/pushrtn with RA instructions. */
if ((INST_HAS_REG_LIST) && ((words[0] >> 7) & 0x1))
currInsn.nargs +=1;
print_arguments (&currInsn, memaddr, info);
return currInsn.size;
}
/* No match found. */
info->fprintf_func (info->stream,"%s ",ILLEGAL);
return 2;
}
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