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binutils-gdb/opcodes/avr-dis.c

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/* Disassemble AVR instructions.
Copyright (C) 1999-2014 Free Software Foundation, Inc.
Contributed by Denis Chertykov <denisc@overta.ru>
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, 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 <assert.h>
#include "dis-asm.h"
#include "opintl.h"
#include "libiberty.h"
struct avr_opcodes_s
{
char *name;
char *constraints;
char *opcode;
int insn_size; /* In words. */
int isa;
unsigned int bin_opcode;
};
#define AVR_INSN(NAME, CONSTR, OPCODE, SIZE, ISA, BIN) \
{#NAME, CONSTR, OPCODE, SIZE, ISA, BIN},
const struct avr_opcodes_s avr_opcodes[] =
{
#include "opcode/avr.h"
{NULL, NULL, NULL, 0, 0, 0}
};
static const char * comment_start = "0x";
static int
avr_operand (unsigned int insn, unsigned int insn2, unsigned int pc, int constraint,
char *opcode_str, char *buf, char *comment, int regs, int *sym, bfd_vma *sym_addr)
{
int ok = 1;
*sym = 0;
switch (constraint)
{
/* Any register operand. */
case 'r':
if (regs)
insn = (insn & 0xf) | ((insn & 0x0200) >> 5); /* Source register. */
else
insn = (insn & 0x01f0) >> 4; /* Destination register. */
sprintf (buf, "r%d", insn);
break;
case 'd':
if (regs)
sprintf (buf, "r%d", 16 + (insn & 0xf));
else
sprintf (buf, "r%d", 16 + ((insn & 0xf0) >> 4));
break;
case 'w':
sprintf (buf, "r%d", 24 + ((insn & 0x30) >> 3));
break;
case 'a':
if (regs)
sprintf (buf, "r%d", 16 + (insn & 7));
else
sprintf (buf, "r%d", 16 + ((insn >> 4) & 7));
break;
case 'v':
if (regs)
sprintf (buf, "r%d", (insn & 0xf) * 2);
else
sprintf (buf, "r%d", ((insn & 0xf0) >> 3));
break;
case 'e':
{
char *xyz;
switch (insn & 0x100f)
{
case 0x0000: xyz = "Z"; break;
case 0x1001: xyz = "Z+"; break;
case 0x1002: xyz = "-Z"; break;
case 0x0008: xyz = "Y"; break;
case 0x1009: xyz = "Y+"; break;
case 0x100a: xyz = "-Y"; break;
case 0x100c: xyz = "X"; break;
case 0x100d: xyz = "X+"; break;
case 0x100e: xyz = "-X"; break;
default: xyz = "??"; ok = 0;
}
strcpy (buf, xyz);
if (AVR_UNDEF_P (insn))
sprintf (comment, _("undefined"));
}
break;
case 'z':
*buf++ = 'Z';
/* Check for post-increment. */
char *s;
for (s = opcode_str; *s; ++s)
{
if (*s == '+')
{
if (insn & (1 << (15 - (s - opcode_str))))
*buf++ = '+';
break;
}
}
*buf = '\0';
if (AVR_UNDEF_P (insn))
sprintf (comment, _("undefined"));
break;
case 'b':
{
unsigned int x;
x = (insn & 7);
x |= (insn >> 7) & (3 << 3);
x |= (insn >> 8) & (1 << 5);
if (insn & 0x8)
*buf++ = 'Y';
else
*buf++ = 'Z';
sprintf (buf, "+%d", x);
sprintf (comment, "0x%02x", x);
}
break;
case 'h':
*sym = 1;
*sym_addr = ((((insn & 1) | ((insn & 0x1f0) >> 3)) << 16) | insn2) * 2;
/* See PR binutils/2454. Ideally we would like to display the hex
value of the address only once, but this would mean recoding
objdump_print_address() which would affect many targets. */
sprintf (buf, "%#lx", (unsigned long) *sym_addr);
strcpy (comment, comment_start);
break;
case 'L':
{
int rel_addr = (((insn & 0xfff) ^ 0x800) - 0x800) * 2;
sprintf (buf, ".%+-8d", rel_addr);
*sym = 1;
*sym_addr = pc + 2 + rel_addr;
strcpy (comment, comment_start);
}
break;
case 'l':
{
int rel_addr = ((((insn >> 3) & 0x7f) ^ 0x40) - 0x40) * 2;
sprintf (buf, ".%+-8d", rel_addr);
*sym = 1;
*sym_addr = pc + 2 + rel_addr;
strcpy (comment, comment_start);
}
break;
case 'i':
sprintf (buf, "0x%04X", insn2);
break;
case 'M':
sprintf (buf, "0x%02X", ((insn & 0xf00) >> 4) | (insn & 0xf));
sprintf (comment, "%d", ((insn & 0xf00) >> 4) | (insn & 0xf));
break;
case 'n':
sprintf (buf, "??");
fprintf (stderr, _("Internal disassembler error"));
ok = 0;
break;
case 'K':
{
unsigned int x;
x = (insn & 0xf) | ((insn >> 2) & 0x30);
sprintf (buf, "0x%02x", x);
sprintf (comment, "%d", x);
}
break;
case 's':
sprintf (buf, "%d", insn & 7);
break;
case 'S':
sprintf (buf, "%d", (insn >> 4) & 7);
break;
case 'P':
{
unsigned int x;
x = (insn & 0xf);
x |= (insn >> 5) & 0x30;
sprintf (buf, "0x%02x", x);
sprintf (comment, "%d", x);
}
break;
case 'p':
{
unsigned int x;
x = (insn >> 3) & 0x1f;
sprintf (buf, "0x%02x", x);
sprintf (comment, "%d", x);
}
break;
case 'E':
sprintf (buf, "%d", (insn >> 4) & 15);
break;
case '?':
*buf = '\0';
break;
default:
sprintf (buf, "??");
fprintf (stderr, _("unknown constraint `%c'"), constraint);
ok = 0;
}
return ok;
}
static unsigned short
avrdis_opcode (bfd_vma addr, disassemble_info *info)
{
bfd_byte buffer[2];
int status;
status = info->read_memory_func (addr, buffer, 2, info);
if (status == 0)
return bfd_getl16 (buffer);
info->memory_error_func (status, addr, info);
return -1;
}
int
print_insn_avr (bfd_vma addr, disassemble_info *info)
{
unsigned int insn, insn2;
const struct avr_opcodes_s *opcode;
static unsigned int *maskptr;
void *stream = info->stream;
fprintf_ftype prin = info->fprintf_func;
static unsigned int *avr_bin_masks;
static int initialized;
int cmd_len = 2;
int ok = 0;
char op1[20], op2[20], comment1[40], comment2[40];
int sym_op1 = 0, sym_op2 = 0;
bfd_vma sym_addr1, sym_addr2;
if (!initialized)
{
unsigned int nopcodes;
/* PR 4045: Try to avoid duplicating the 0x prefix that
objdump_print_addr() will put on addresses when there
is no symbol table available. */
if (info->symtab_size == 0)
comment_start = " ";
nopcodes = sizeof (avr_opcodes) / sizeof (struct avr_opcodes_s);
avr_bin_masks = xmalloc (nopcodes * sizeof (unsigned int));
for (opcode = avr_opcodes, maskptr = avr_bin_masks;
opcode->name;
opcode++, maskptr++)
{
char * s;
unsigned int bin = 0;
unsigned int mask = 0;
for (s = opcode->opcode; *s; ++s)
{
bin <<= 1;
mask <<= 1;
bin |= (*s == '1');
mask |= (*s == '1' || *s == '0');
}
assert (s - opcode->opcode == 16);
assert (opcode->bin_opcode == bin);
*maskptr = mask;
}
initialized = 1;
}
insn = avrdis_opcode (addr, info);
for (opcode = avr_opcodes, maskptr = avr_bin_masks;
opcode->name;
opcode++, maskptr++)
if ((insn & *maskptr) == opcode->bin_opcode)
break;
/* Special case: disassemble `ldd r,b+0' as `ld r,b', and
`std b+0,r' as `st b,r' (next entry in the table). */
if (AVR_DISP0_P (insn))
opcode++;
op1[0] = 0;
op2[0] = 0;
comment1[0] = 0;
comment2[0] = 0;
if (opcode->name)
{
char *constraints = opcode->constraints;
char *opcode_str = opcode->opcode;
insn2 = 0;
ok = 1;
if (opcode->insn_size > 1)
{
insn2 = avrdis_opcode (addr + 2, info);
cmd_len = 4;
}
if (*constraints && *constraints != '?')
{
int regs = REGISTER_P (*constraints);
ok = avr_operand (insn, insn2, addr, *constraints, opcode_str, op1, comment1, 0, &sym_op1, &sym_addr1);
if (ok && *(++constraints) == ',')
ok = avr_operand (insn, insn2, addr, *(++constraints), opcode_str, op2,
*comment1 ? comment2 : comment1, regs, &sym_op2, &sym_addr2);
}
}
if (!ok)
{
/* Unknown opcode, or invalid combination of operands. */
sprintf (op1, "0x%04x", insn);
op2[0] = 0;
sprintf (comment1, "????");
comment2[0] = 0;
}
(*prin) (stream, "%s", ok ? opcode->name : ".word");
if (*op1)
(*prin) (stream, "\t%s", op1);
if (*op2)
(*prin) (stream, ", %s", op2);
if (*comment1)
(*prin) (stream, "\t; %s", comment1);
if (sym_op1)
info->print_address_func (sym_addr1, info);
if (*comment2)
(*prin) (stream, " %s", comment2);
if (sym_op2)
info->print_address_func (sym_addr2, info);
return cmd_len;
}
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