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binutils-gdb/opcodes/tic4x-dis.c

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/* Print instructions for the Texas TMS320C[34]X, for GDB and GNU Binutils.
Copyright (C) 2002-2017 Free Software Foundation, Inc.
Contributed by Michael P. Hayes (m.hayes@elec.canterbury.ac.nz)
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 <math.h>
#include "libiberty.h"
#include "disassemble.h"
#include "opcode/tic4x.h"
#define TIC4X_DEBUG 0
#define TIC4X_HASH_SIZE 11 /* 11 (bits) and above should give unique entries. */
#define TIC4X_SPESOP_SIZE 8 /* Max 8. ops for special instructions. */
typedef enum
{
IMMED_SINT,
IMMED_SUINT,
IMMED_SFLOAT,
IMMED_INT,
IMMED_UINT,
IMMED_FLOAT
}
immed_t;
typedef enum
{
INDIRECT_SHORT,
INDIRECT_LONG,
INDIRECT_TIC4X
}
indirect_t;
static int tic4x_version = 0;
static int tic4x_dp = 0;
static int
tic4x_pc_offset (unsigned int op)
{
/* Determine the PC offset for a C[34]x instruction.
This could be simplified using some boolean algebra
but at the expense of readability. */
switch (op >> 24)
{
case 0x60: /* br */
case 0x62: /* call (C4x) */
case 0x64: /* rptb (C4x) */
return 1;
case 0x61: /* brd */
case 0x63: /* laj */
case 0x65: /* rptbd (C4x) */
return 3;
case 0x66: /* swi */
case 0x67:
return 0;
default:
break;
}
switch ((op & 0xffe00000) >> 20)
{
case 0x6a0: /* bB */
case 0x720: /* callB */
case 0x740: /* trapB */
return 1;
case 0x6a2: /* bBd */
case 0x6a6: /* bBat */
case 0x6aa: /* bBaf */
case 0x722: /* lajB */
case 0x748: /* latB */
case 0x798: /* rptbd */
return 3;
default:
break;
}
switch ((op & 0xfe200000) >> 20)
{
case 0x6e0: /* dbB */
return 1;
case 0x6e2: /* dbBd */
return 3;
default:
break;
}
return 0;
}
static int
tic4x_print_char (struct disassemble_info * info, char ch)
{
if (info != NULL)
(*info->fprintf_func) (info->stream, "%c", ch);
return 1;
}
static int
tic4x_print_str (struct disassemble_info *info, const char *str)
{
if (info != NULL)
(*info->fprintf_func) (info->stream, "%s", str);
return 1;
}
static int
tic4x_print_register (struct disassemble_info *info, unsigned long regno)
{
static tic4x_register_t ** registertable = NULL;
unsigned int i;
if (registertable == NULL)
{
registertable = xmalloc (sizeof (tic4x_register_t *) * REG_TABLE_SIZE);
for (i = 0; i < tic3x_num_registers; i++)
registertable[tic3x_registers[i].regno] = (tic4x_register_t *) (tic3x_registers + i);
if (IS_CPU_TIC4X (tic4x_version))
{
/* Add C4x additional registers, overwriting
any C3x registers if necessary. */
for (i = 0; i < tic4x_num_registers; i++)
registertable[tic4x_registers[i].regno] =
(tic4x_register_t *)(tic4x_registers + i);
}
}
if ((int) regno > (IS_CPU_TIC4X (tic4x_version) ? TIC4X_REG_MAX : TIC3X_REG_MAX))
return 0;
if (info != NULL)
(*info->fprintf_func) (info->stream, "%s", registertable[regno]->name);
return 1;
}
static int
tic4x_print_addr (struct disassemble_info *info, unsigned long addr)
{
if (info != NULL)
(*info->print_address_func)(addr, info);
return 1;
}
static int
tic4x_print_relative (struct disassemble_info *info,
unsigned long pc,
long offset,
unsigned long opcode)
{
return tic4x_print_addr (info, pc + offset + tic4x_pc_offset (opcode));
}
static int
tic4x_print_direct (struct disassemble_info *info, unsigned long arg)
{
if (info != NULL)
{
(*info->fprintf_func) (info->stream, "@");
tic4x_print_addr (info, arg + (tic4x_dp << 16));
}
return 1;
}
#if 0
/* FIXME: make the floating point stuff not rely on host
floating point arithmetic. */
static void
tic4x_print_ftoa (unsigned int val, FILE *stream, fprintf_ftype pfunc)
{
int e;
int s;
int f;
double num = 0.0;
e = EXTRS (val, 31, 24); /* Exponent. */
if (e != -128)
{
s = EXTRU (val, 23, 23); /* Sign bit. */
f = EXTRU (val, 22, 0); /* Mantissa. */
if (s)
f += -2 * (1 << 23);
else
f += (1 << 23);
num = f / (double)(1 << 23);
num = ldexp (num, e);
}
(*pfunc)(stream, "%.9g", num);
}
#endif
static int
tic4x_print_immed (struct disassemble_info *info,
immed_t type,
unsigned long arg)
{
int s;
int f;
int e;
double num = 0.0;
if (info == NULL)
return 1;
switch (type)
{
case IMMED_SINT:
case IMMED_INT:
(*info->fprintf_func) (info->stream, "%ld", (long) arg);
break;
case IMMED_SUINT:
case IMMED_UINT:
(*info->fprintf_func) (info->stream, "%lu", arg);
break;
case IMMED_SFLOAT:
e = EXTRS (arg, 15, 12);
if (e != -8)
{
s = EXTRU (arg, 11, 11);
f = EXTRU (arg, 10, 0);
if (s)
f += -2 * (1 << 11);
else
f += (1 << 11);
num = f / (double)(1 << 11);
num = ldexp (num, e);
}
(*info->fprintf_func) (info->stream, "%f", num);
break;
case IMMED_FLOAT:
e = EXTRS (arg, 31, 24);
if (e != -128)
{
s = EXTRU (arg, 23, 23);
f = EXTRU (arg, 22, 0);
if (s)
f += -2 * (1 << 23);
else
f += (1 << 23);
num = f / (double)(1 << 23);
num = ldexp (num, e);
}
(*info->fprintf_func) (info->stream, "%f", num);
break;
}
return 1;
}
static int
tic4x_print_cond (struct disassemble_info *info, unsigned int cond)
{
static tic4x_cond_t **condtable = NULL;
unsigned int i;
if (condtable == NULL)
{
condtable = xmalloc (sizeof (tic4x_cond_t *) * 32);
for (i = 0; i < tic4x_num_conds; i++)
condtable[tic4x_conds[i].cond] = (tic4x_cond_t *)(tic4x_conds + i);
}
if (cond > 31 || condtable[cond] == NULL)
return 0;
if (info != NULL)
(*info->fprintf_func) (info->stream, "%s", condtable[cond]->name);
return 1;
}
static int
tic4x_print_indirect (struct disassemble_info *info,
indirect_t type,
unsigned long arg)
{
unsigned int aregno;
unsigned int modn;
unsigned int disp;
const char *a;
aregno = 0;
modn = 0;
disp = 1;
switch(type)
{
case INDIRECT_TIC4X: /* *+ARn(disp) */
disp = EXTRU (arg, 7, 3);
aregno = EXTRU (arg, 2, 0) + REG_AR0;
modn = 0;
break;
case INDIRECT_SHORT:
disp = 1;
aregno = EXTRU (arg, 2, 0) + REG_AR0;
modn = EXTRU (arg, 7, 3);
break;
case INDIRECT_LONG:
disp = EXTRU (arg, 7, 0);
aregno = EXTRU (arg, 10, 8) + REG_AR0;
modn = EXTRU (arg, 15, 11);
if (modn > 7 && disp != 0)
return 0;
break;
default:
(*info->fprintf_func)(info->stream, "# internal error: Unknown indirect type %d", type);
return 0;
}
if (modn > TIC3X_MODN_MAX)
return 0;
a = tic4x_indirects[modn].name;
while (*a)
{
switch (*a)
{
case 'a':
tic4x_print_register (info, aregno);
break;
case 'd':
tic4x_print_immed (info, IMMED_UINT, disp);
break;
case 'y':
tic4x_print_str (info, "ir0");
break;
case 'z':
tic4x_print_str (info, "ir1");
break;
default:
tic4x_print_char (info, *a);
break;
}
a++;
}
return 1;
}
static int
tic4x_print_op (struct disassemble_info *info,
unsigned long instruction,
tic4x_inst_t *p,
unsigned long pc)
{
int val;
const char *s;
const char *parallel = NULL;
/* Print instruction name. */
s = p->name;
while (*s && parallel == NULL)
{
switch (*s)
{
case 'B':
if (! tic4x_print_cond (info, EXTRU (instruction, 20, 16)))
return 0;
break;
case 'C':
if (! tic4x_print_cond (info, EXTRU (instruction, 27, 23)))
return 0;
break;
case '_':
parallel = s + 1; /* Skip past `_' in name. */
break;
default:
tic4x_print_char (info, *s);
break;
}
s++;
}
/* Print arguments. */
s = p->args;
if (*s)
tic4x_print_char (info, ' ');
while (*s)
{
switch (*s)
{
case '*': /* Indirect 0--15. */
if (! tic4x_print_indirect (info, INDIRECT_LONG,
EXTRU (instruction, 15, 0)))
return 0;
break;
case '#': /* Only used for ldp, ldpk. */
tic4x_print_immed (info, IMMED_UINT, EXTRU (instruction, 15, 0));
break;
case '@': /* Direct 0--15. */
tic4x_print_direct (info, EXTRU (instruction, 15, 0));
break;
case 'A': /* Address register 24--22. */
if (! tic4x_print_register (info, EXTRU (instruction, 24, 22) +
REG_AR0))
return 0;
break;
case 'B': /* 24-bit unsigned int immediate br(d)/call/rptb
address 0--23. */
if (IS_CPU_TIC4X (tic4x_version))
tic4x_print_relative (info, pc, EXTRS (instruction, 23, 0),
p->opcode);
else
tic4x_print_addr (info, EXTRU (instruction, 23, 0));
break;
case 'C': /* Indirect (short C4x) 0--7. */
if (! IS_CPU_TIC4X (tic4x_version))
return 0;
if (! tic4x_print_indirect (info, INDIRECT_TIC4X,
EXTRU (instruction, 7, 0)))
return 0;
break;
case 'D':
/* Cockup if get here... */
break;
case 'E': /* Register 0--7. */
case 'e':
if (! tic4x_print_register (info, EXTRU (instruction, 7, 0)))
return 0;
break;
case 'F': /* 16-bit float immediate 0--15. */
tic4x_print_immed (info, IMMED_SFLOAT,
EXTRU (instruction, 15, 0));
break;
case 'i': /* Extended indirect 0--7. */
if (EXTRU (instruction, 7, 5) == 7)
{
if (!tic4x_print_register (info, EXTRU (instruction, 4, 0)))
return 0;
break;
}
/* Fallthrough */
case 'I': /* Indirect (short) 0--7. */
if (! tic4x_print_indirect (info, INDIRECT_SHORT,
EXTRU (instruction, 7, 0)))
return 0;
break;
case 'j': /* Extended indirect 8--15 */
if (EXTRU (instruction, 15, 13) == 7)
{
if (! tic4x_print_register (info, EXTRU (instruction, 12, 8)))
return 0;
break;
}
/* Fall through. */
case 'J': /* Indirect (short) 8--15. */
if (! tic4x_print_indirect (info, INDIRECT_SHORT,
EXTRU (instruction, 15, 8)))
return 0;
break;
case 'G': /* Register 8--15. */
case 'g':
if (! tic4x_print_register (info, EXTRU (instruction, 15, 8)))
return 0;
break;
case 'H': /* Register 16--18. */
if (! tic4x_print_register (info, EXTRU (instruction, 18, 16)))
return 0;
break;
case 'K': /* Register 19--21. */
if (! tic4x_print_register (info, EXTRU (instruction, 21, 19)))
return 0;
break;
case 'L': /* Register 22--24. */
if (! tic4x_print_register (info, EXTRU (instruction, 24, 22)))
return 0;
break;
case 'M': /* Register 22--22. */
tic4x_print_register (info, EXTRU (instruction, 22, 22) + REG_R2);
break;
case 'N': /* Register 23--23. */
tic4x_print_register (info, EXTRU (instruction, 23, 23) + REG_R0);
break;
case 'O': /* Indirect (short C4x) 8--15. */
if (! IS_CPU_TIC4X (tic4x_version))
return 0;
if (! tic4x_print_indirect (info, INDIRECT_TIC4X,
EXTRU (instruction, 15, 8)))
return 0;
break;
case 'P': /* Displacement 0--15 (used by Bcond and BcondD). */
tic4x_print_relative (info, pc, EXTRS (instruction, 15, 0),
p->opcode);
break;
case 'Q': /* Register 0--15. */
case 'q':
if (! tic4x_print_register (info, EXTRU (instruction, 15, 0)))
return 0;
break;
case 'R': /* Register 16--20. */
case 'r':
if (! tic4x_print_register (info, EXTRU (instruction, 20, 16)))
return 0;
break;
case 'S': /* 16-bit signed immediate 0--15. */
tic4x_print_immed (info, IMMED_SINT,
EXTRS (instruction, 15, 0));
break;
case 'T': /* 5-bit signed immediate 16--20 (C4x stik). */
if (! IS_CPU_TIC4X (tic4x_version))
return 0;
if (! tic4x_print_immed (info, IMMED_SUINT,
EXTRU (instruction, 20, 16)))
return 0;
break;
case 'U': /* 16-bit unsigned int immediate 0--15. */
tic4x_print_immed (info, IMMED_SUINT, EXTRU (instruction, 15, 0));
break;
case 'V': /* 5/9-bit unsigned vector 0--4/8. */
tic4x_print_immed (info, IMMED_SUINT,
IS_CPU_TIC4X (tic4x_version) ?
EXTRU (instruction, 8, 0) :
EXTRU (instruction, 4, 0) & ~0x20);
break;
case 'W': /* 8-bit signed immediate 0--7. */
if (! IS_CPU_TIC4X (tic4x_version))
return 0;
tic4x_print_immed (info, IMMED_SINT, EXTRS (instruction, 7, 0));
break;
case 'X': /* Expansion register 4--0. */
val = EXTRU (instruction, 4, 0) + REG_IVTP;
if (val < REG_IVTP || val > REG_TVTP)
return 0;
if (! tic4x_print_register (info, val))
return 0;
break;
case 'Y': /* Address register 16--20. */
val = EXTRU (instruction, 20, 16);
if (val < REG_AR0 || val > REG_SP)
return 0;
if (! tic4x_print_register (info, val))
return 0;
break;
case 'Z': /* Expansion register 16--20. */
val = EXTRU (instruction, 20, 16) + REG_IVTP;
if (val < REG_IVTP || val > REG_TVTP)
return 0;
if (! tic4x_print_register (info, val))
return 0;
break;
case '|': /* Parallel instruction. */
tic4x_print_str (info, " || ");
tic4x_print_str (info, parallel);
tic4x_print_char (info, ' ');
break;
case ';':
tic4x_print_char (info, ',');
break;
default:
tic4x_print_char (info, *s);
break;
}
s++;
}
return 1;
}
static void
tic4x_hash_opcode_special (tic4x_inst_t **optable_special,
const tic4x_inst_t *inst)
{
int i;
for (i = 0;i < TIC4X_SPESOP_SIZE; i++)
if (optable_special[i] != NULL
&& optable_special[i]->opcode == inst->opcode)
{
/* Collision (we have it already) - overwrite. */
optable_special[i] = (tic4x_inst_t *) inst;
return;
}
for (i = 0; i < TIC4X_SPESOP_SIZE; i++)
if (optable_special[i] == NULL)
{
/* Add the new opcode. */
optable_special[i] = (tic4x_inst_t *) inst;
return;
}
/* This should never occur. This happens if the number of special
instructions exceeds TIC4X_SPESOP_SIZE. Please increase the variable
of this variable */
#if TIC4X_DEBUG
printf ("optable_special[] is full, please increase TIC4X_SPESOP_SIZE!\n");
#endif
}
static void
tic4x_hash_opcode (tic4x_inst_t **optable,
tic4x_inst_t **optable_special,
const tic4x_inst_t *inst,
const unsigned long tic4x_oplevel)
{
int j;
int opcode = inst->opcode >> (32 - TIC4X_HASH_SIZE);
int opmask = inst->opmask >> (32 - TIC4X_HASH_SIZE);
/* Use a TIC4X_HASH_SIZE bit index as a hash index. We should
have unique entries so there's no point having a linked list
for each entry? */
for (j = opcode; j < opmask; j++)
if ((j & opmask) == opcode
&& inst->oplevel & tic4x_oplevel)
{
#if TIC4X_DEBUG
/* We should only have collisions for synonyms like
ldp for ldi. */
if (optable[j] != NULL)
printf ("Collision at index %d, %s and %s\n",
j, optable[j]->name, inst->name);
#endif
/* Catch those ops that collide with others already inside the
hash, and have a opmask greater than the one we use in the
hash. Store them in a special-list, that will handle full
32-bit INSN, not only the first 11-bit (or so). */
if (optable[j] != NULL
&& inst->opmask & ~(opmask << (32 - TIC4X_HASH_SIZE)))
{
/* Add the instruction already on the list. */
tic4x_hash_opcode_special (optable_special, optable[j]);
/* Add the new instruction. */
tic4x_hash_opcode_special (optable_special, inst);
}
optable[j] = (tic4x_inst_t *) inst;
}
}
/* Disassemble the instruction in 'instruction'.
'pc' should be the address of this instruction, it will
be used to print the target address if this is a relative jump or call
the disassembled instruction is written to 'info'.
The function returns the length of this instruction in words. */
static int
tic4x_disassemble (unsigned long pc,
unsigned long instruction,
struct disassemble_info *info)
{
static tic4x_inst_t **optable = NULL;
static tic4x_inst_t **optable_special = NULL;
tic4x_inst_t *p;
int i;
unsigned long tic4x_oplevel;
tic4x_version = info->mach;
tic4x_oplevel = (IS_CPU_TIC4X (tic4x_version)) ? OP_C4X : 0;
tic4x_oplevel |= OP_C3X | OP_LPWR | OP_IDLE2 | OP_ENH;
if (optable == NULL)
{
optable = xcalloc (sizeof (tic4x_inst_t *), (1 << TIC4X_HASH_SIZE));
optable_special = xcalloc (sizeof (tic4x_inst_t *), TIC4X_SPESOP_SIZE);
/* Install opcodes in reverse order so that preferred
forms overwrite synonyms. */
for (i = tic4x_num_insts - 1; i >= 0; i--)
tic4x_hash_opcode (optable, optable_special, &tic4x_insts[i],
tic4x_oplevel);
/* We now need to remove the insn that are special from the
"normal" optable, to make the disasm search this extra list
for them. */
for (i = 0; i < TIC4X_SPESOP_SIZE; i++)
if (optable_special[i] != NULL)
optable[optable_special[i]->opcode >> (32 - TIC4X_HASH_SIZE)] = NULL;
}
/* See if we can pick up any loading of the DP register... */
if ((instruction >> 16) == 0x5070 || (instruction >> 16) == 0x1f70)
tic4x_dp = EXTRU (instruction, 15, 0);
p = optable[instruction >> (32 - TIC4X_HASH_SIZE)];
if (p != NULL)
{
if (((instruction & p->opmask) == p->opcode)
&& tic4x_print_op (NULL, instruction, p, pc))
tic4x_print_op (info, instruction, p, pc);
else
(*info->fprintf_func) (info->stream, "%08lx", instruction);
}
else
{
for (i = 0; i<TIC4X_SPESOP_SIZE; i++)
if (optable_special[i] != NULL
&& optable_special[i]->opcode == instruction)
{
(*info->fprintf_func)(info->stream, "%s", optable_special[i]->name);
break;
}
if (i == TIC4X_SPESOP_SIZE)
(*info->fprintf_func) (info->stream, "%08lx", instruction);
}
/* Return size of insn in words. */
return 1;
}
/* The entry point from objdump and gdb. */
int
print_insn_tic4x (bfd_vma memaddr, struct disassemble_info *info)
{
int status;
unsigned long pc;
unsigned long op;
bfd_byte buffer[4];
status = (*info->read_memory_func) (memaddr, buffer, 4, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
pc = memaddr;
op = bfd_getl32 (buffer);
info->bytes_per_line = 4;
info->bytes_per_chunk = 4;
info->octets_per_byte = 4;
info->display_endian = BFD_ENDIAN_LITTLE;
return tic4x_disassemble (pc, op, info) * 4;
}
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