404 lines
8.9 KiB
C
404 lines
8.9 KiB
C
/* Disassemble AVR instructions.
|
|
Copyright 1999, 2000, 2002, 2004, 2005, 2006, 2007, 2008
|
|
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 <assert.h>
|
|
#include "sysdep.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;
|
|
}
|