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Retro68/binutils/opcodes/microblaze-dis.c

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/* Disassemble Xilinx microblaze instructions.
Copyright 2009, 2012 Free Software Foundation, Inc.
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 file; see the file COPYING. If not, write to the
Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#define STATIC_TABLE
#define DEFINE_TABLE
#include "dis-asm.h"
#include <strings.h>
#include "microblaze-opc.h"
#include "microblaze-dis.h"
#define get_field_rd(instr) get_field (instr, RD_MASK, RD_LOW)
#define get_field_r1(instr) get_field (instr, RA_MASK, RA_LOW)
#define get_field_r2(instr) get_field (instr, RB_MASK, RB_LOW)
#define get_int_field_imm(instr) ((instr & IMM_MASK) >> IMM_LOW)
#define get_int_field_r1(instr) ((instr & RA_MASK) >> RA_LOW)
static char *
get_field (long instr, long mask, unsigned short low)
{
char tmpstr[25];
sprintf (tmpstr, "%s%d", register_prefix, (int)((instr & mask) >> low));
return (strdup (tmpstr));
}
static char *
get_field_imm (long instr)
{
char tmpstr[25];
sprintf (tmpstr, "%d", (short)((instr & IMM_MASK) >> IMM_LOW));
return (strdup (tmpstr));
}
static char *
get_field_imm5 (long instr)
{
char tmpstr[25];
sprintf (tmpstr, "%d", (short)((instr & IMM5_MASK) >> IMM_LOW));
return (strdup (tmpstr));
}
static char *
get_field_imm5_mbar (long instr)
{
char tmpstr[25];
sprintf(tmpstr, "%d", (short)((instr & IMM5_MBAR_MASK) >> IMM_MBAR));
return(strdup(tmpstr));
}
static char *
get_field_rfsl (long instr)
{
char tmpstr[25];
sprintf (tmpstr, "%s%d", fsl_register_prefix,
(short)((instr & RFSL_MASK) >> IMM_LOW));
return (strdup (tmpstr));
}
static char *
get_field_imm15 (long instr)
{
char tmpstr[25];
sprintf (tmpstr, "%d", (short)((instr & IMM15_MASK) >> IMM_LOW));
return (strdup (tmpstr));
}
static char *
get_field_special (long instr, struct op_code_struct * op)
{
char tmpstr[25];
char spr[6];
switch ((((instr & IMM_MASK) >> IMM_LOW) ^ op->immval_mask))
{
case REG_MSR_MASK :
strcpy (spr, "msr");
break;
case REG_PC_MASK :
strcpy (spr, "pc");
break;
case REG_EAR_MASK :
strcpy (spr, "ear");
break;
case REG_ESR_MASK :
strcpy (spr, "esr");
break;
case REG_FSR_MASK :
strcpy (spr, "fsr");
break;
case REG_BTR_MASK :
strcpy (spr, "btr");
break;
case REG_EDR_MASK :
strcpy (spr, "edr");
break;
case REG_PID_MASK :
strcpy (spr, "pid");
break;
case REG_ZPR_MASK :
strcpy (spr, "zpr");
break;
case REG_TLBX_MASK :
strcpy (spr, "tlbx");
break;
case REG_TLBLO_MASK :
strcpy (spr, "tlblo");
break;
case REG_TLBHI_MASK :
strcpy (spr, "tlbhi");
break;
case REG_TLBSX_MASK :
strcpy (spr, "tlbsx");
break;
case REG_SHR_MASK :
strcpy (spr, "shr");
break;
case REG_SLR_MASK :
strcpy (spr, "slr");
break;
default :
if (((((instr & IMM_MASK) >> IMM_LOW) ^ op->immval_mask) & 0xE000)
== REG_PVR_MASK)
{
sprintf (tmpstr, "%spvr%d", register_prefix,
(unsigned short)(((instr & IMM_MASK) >> IMM_LOW)
^ op->immval_mask) ^ REG_PVR_MASK);
return (strdup (tmpstr));
}
else
strcpy (spr, "pc");
break;
}
sprintf (tmpstr, "%s%s", register_prefix, spr);
return (strdup (tmpstr));
}
static unsigned long
read_insn_microblaze (bfd_vma memaddr,
struct disassemble_info *info,
struct op_code_struct **opr)
{
unsigned char ibytes[4];
int status;
struct op_code_struct * op;
unsigned long inst;
status = info->read_memory_func (memaddr, ibytes, 4, info);
if (status != 0)
{
info->memory_error_func (status, memaddr, info);
return 0;
}
if (info->endian == BFD_ENDIAN_BIG)
inst = (ibytes[0] << 24) | (ibytes[1] << 16) | (ibytes[2] << 8) | ibytes[3];
else if (info->endian == BFD_ENDIAN_LITTLE)
inst = (ibytes[3] << 24) | (ibytes[2] << 16) | (ibytes[1] << 8) | ibytes[0];
else
abort ();
/* Just a linear search of the table. */
for (op = opcodes; op->name != 0; op ++)
if (op->bit_sequence == (inst & op->opcode_mask))
break;
*opr = op;
return inst;
}
int
print_insn_microblaze (bfd_vma memaddr, struct disassemble_info * info)
{
fprintf_ftype print_func = info->fprintf_func;
void * stream = info->stream;
unsigned long inst, prev_inst;
struct op_code_struct * op, *pop;
int immval = 0;
bfd_boolean immfound = FALSE;
static bfd_vma prev_insn_addr = -1; /* Init the prev insn addr. */
static int prev_insn_vma = -1; /* Init the prev insn vma. */
int curr_insn_vma = info->buffer_vma;
info->bytes_per_chunk = 4;
inst = read_insn_microblaze (memaddr, info, &op);
if (inst == 0)
return -1;
if (prev_insn_vma == curr_insn_vma)
{
if (memaddr-(info->bytes_per_chunk) == prev_insn_addr)
{
prev_inst = read_insn_microblaze (prev_insn_addr, info, &pop);
if (prev_inst == 0)
return -1;
if (pop->instr == imm)
{
immval = (get_int_field_imm (prev_inst) << 16) & 0xffff0000;
immfound = TRUE;
}
else
{
immval = 0;
immfound = FALSE;
}
}
}
/* Make curr insn as prev insn. */
prev_insn_addr = memaddr;
prev_insn_vma = curr_insn_vma;
if (op->name == NULL)
print_func (stream, ".short 0x%04x", (unsigned int) inst);
else
{
print_func (stream, "%s", op->name);
switch (op->inst_type)
{
case INST_TYPE_RD_R1_R2:
print_func (stream, "\t%s, %s, %s", get_field_rd (inst),
get_field_r1(inst), get_field_r2 (inst));
break;
case INST_TYPE_RD_R1_IMM:
print_func (stream, "\t%s, %s, %s", get_field_rd (inst),
get_field_r1(inst), get_field_imm (inst));
if (info->print_address_func && get_int_field_r1 (inst) == 0
&& info->symbol_at_address_func)
{
if (immfound)
immval |= (get_int_field_imm (inst) & 0x0000ffff);
else
{
immval = get_int_field_imm (inst);
if (immval & 0x8000)
immval |= 0xFFFF0000;
}
if (immval > 0 && info->symbol_at_address_func (immval, info))
{
print_func (stream, "\t// ");
info->print_address_func (immval, info);
}
}
break;
case INST_TYPE_RD_R1_IMM5:
print_func (stream, "\t%s, %s, %s", get_field_rd (inst),
get_field_r1(inst), get_field_imm5 (inst));
break;
case INST_TYPE_RD_RFSL:
print_func (stream, "\t%s, %s", get_field_rd (inst), get_field_rfsl (inst));
break;
case INST_TYPE_R1_RFSL:
print_func (stream, "\t%s, %s", get_field_r1 (inst), get_field_rfsl (inst));
break;
case INST_TYPE_RD_SPECIAL:
print_func (stream, "\t%s, %s", get_field_rd (inst),
get_field_special (inst, op));
break;
case INST_TYPE_SPECIAL_R1:
print_func (stream, "\t%s, %s", get_field_special (inst, op),
get_field_r1(inst));
break;
case INST_TYPE_RD_R1:
print_func (stream, "\t%s, %s", get_field_rd (inst), get_field_r1 (inst));
break;
case INST_TYPE_R1_R2:
print_func (stream, "\t%s, %s", get_field_r1 (inst), get_field_r2 (inst));
break;
case INST_TYPE_R1_IMM:
print_func (stream, "\t%s, %s", get_field_r1 (inst), get_field_imm (inst));
/* The non-pc relative instructions are returns, which shouldn't
have a label printed. */
if (info->print_address_func && op->inst_offset_type == INST_PC_OFFSET
&& info->symbol_at_address_func)
{
if (immfound)
immval |= (get_int_field_imm (inst) & 0x0000ffff);
else
{
immval = get_int_field_imm (inst);
if (immval & 0x8000)
immval |= 0xFFFF0000;
}
immval += memaddr;
if (immval > 0 && info->symbol_at_address_func (immval, info))
{
print_func (stream, "\t// ");
info->print_address_func (immval, info);
}
else
{
print_func (stream, "\t\t// ");
print_func (stream, "%x", immval);
}
}
break;
case INST_TYPE_RD_IMM:
print_func (stream, "\t%s, %s", get_field_rd (inst), get_field_imm (inst));
if (info->print_address_func && info->symbol_at_address_func)
{
if (immfound)
immval |= (get_int_field_imm (inst) & 0x0000ffff);
else
{
immval = get_int_field_imm (inst);
if (immval & 0x8000)
immval |= 0xFFFF0000;
}
if (op->inst_offset_type == INST_PC_OFFSET)
immval += (int) memaddr;
if (info->symbol_at_address_func (immval, info))
{
print_func (stream, "\t// ");
info->print_address_func (immval, info);
}
}
break;
case INST_TYPE_IMM:
print_func (stream, "\t%s", get_field_imm (inst));
if (info->print_address_func && info->symbol_at_address_func
&& op->instr != imm)
{
if (immfound)
immval |= (get_int_field_imm (inst) & 0x0000ffff);
else
{
immval = get_int_field_imm (inst);
if (immval & 0x8000)
immval |= 0xFFFF0000;
}
if (op->inst_offset_type == INST_PC_OFFSET)
immval += (int) memaddr;
if (immval > 0 && info->symbol_at_address_func (immval, info))
{
print_func (stream, "\t// ");
info->print_address_func (immval, info);
}
else if (op->inst_offset_type == INST_PC_OFFSET)
{
print_func (stream, "\t\t// ");
print_func (stream, "%x", immval);
}
}
break;
case INST_TYPE_RD_R2:
print_func (stream, "\t%s, %s", get_field_rd (inst), get_field_r2 (inst));
break;
case INST_TYPE_R2:
print_func (stream, "\t%s", get_field_r2 (inst));
break;
case INST_TYPE_R1:
print_func (stream, "\t%s", get_field_r1 (inst));
break;
case INST_TYPE_R1_R2_SPECIAL:
print_func (stream, "\t%s, %s", get_field_r1 (inst), get_field_r2 (inst));
break;
case INST_TYPE_RD_IMM15:
print_func (stream, "\t%s, %s", get_field_rd (inst), get_field_imm15 (inst));
break;
/* For mbar insn. */
case INST_TYPE_IMM5:
print_func (stream, "\t%s", get_field_imm5_mbar (inst));
break;
/* For mbar 16 or sleep insn. */
case INST_TYPE_NONE:
break;
/* For tuqula instruction */
case INST_TYPE_RD:
print_func (stream, "\t%s", get_field_rd (inst));
break;
case INST_TYPE_RFSL:
print_func (stream, "\t%s", get_field_rfsl (inst));
break;
default:
/* If the disassembler lags the instruction set. */
print_func (stream, "\tundecoded operands, inst is 0x%04x", (unsigned int) inst);
break;
}
}
/* Say how many bytes we consumed. */
return 4;
}
enum microblaze_instr
get_insn_microblaze (long inst,
bfd_boolean *isunsignedimm,
enum microblaze_instr_type *insn_type,
short *delay_slots)
{
struct op_code_struct * op;
*isunsignedimm = FALSE;
/* Just a linear search of the table. */
for (op = opcodes; op->name != 0; op ++)
if (op->bit_sequence == (inst & op->opcode_mask))
break;
if (op->name == 0)
return invalid_inst;
else
{
*isunsignedimm = (op->inst_type == INST_TYPE_RD_R1_UNSIGNED_IMM);
*insn_type = op->instr_type;
*delay_slots = op->delay_slots;
return op->instr;
}
}
enum microblaze_instr
microblaze_decode_insn (long insn, int *rd, int *ra, int *rb, int *immed)
{
enum microblaze_instr op;
bfd_boolean t1;
enum microblaze_instr_type t2;
short t3;
op = get_insn_microblaze (insn, &t1, &t2, &t3);
*rd = (insn & RD_MASK) >> RD_LOW;
*ra = (insn & RA_MASK) >> RA_LOW;
*rb = (insn & RB_MASK) >> RB_LOW;
t3 = (insn & IMM_MASK) >> IMM_LOW;
*immed = (int) t3;
return (op);
}
unsigned long
microblaze_get_target_address (long inst, bfd_boolean immfound, int immval,
long pcval, long r1val, long r2val,
bfd_boolean *targetvalid,
bfd_boolean *unconditionalbranch)
{
struct op_code_struct * op;
long targetaddr = 0;
*unconditionalbranch = FALSE;
/* Just a linear search of the table. */
for (op = opcodes; op->name != 0; op ++)
if (op->bit_sequence == (inst & op->opcode_mask))
break;
if (op->name == 0)
{
*targetvalid = FALSE;
}
else if (op->instr_type == branch_inst)
{
switch (op->inst_type)
{
case INST_TYPE_R2:
*unconditionalbranch = TRUE;
/* Fall through. */
case INST_TYPE_RD_R2:
case INST_TYPE_R1_R2:
targetaddr = r2val;
*targetvalid = TRUE;
if (op->inst_offset_type == INST_PC_OFFSET)
targetaddr += pcval;
break;
case INST_TYPE_IMM:
*unconditionalbranch = TRUE;
/* Fall through. */
case INST_TYPE_RD_IMM:
case INST_TYPE_R1_IMM:
if (immfound)
{
targetaddr = (immval << 16) & 0xffff0000;
targetaddr |= (get_int_field_imm (inst) & 0x0000ffff);
}
else
{
targetaddr = get_int_field_imm (inst);
if (targetaddr & 0x8000)
targetaddr |= 0xFFFF0000;
}
if (op->inst_offset_type == INST_PC_OFFSET)
targetaddr += pcval;
*targetvalid = TRUE;
break;
default:
*targetvalid = FALSE;
break;
}
}
else if (op->instr_type == return_inst)
{
if (immfound)
{
targetaddr = (immval << 16) & 0xffff0000;
targetaddr |= (get_int_field_imm (inst) & 0x0000ffff);
}
else
{
targetaddr = get_int_field_imm (inst);
if (targetaddr & 0x8000)
targetaddr |= 0xFFFF0000;
}
targetaddr += r1val;
*targetvalid = TRUE;
}
else
*targetvalid = FALSE;
return targetaddr;
}
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