/* Instruction printing code for the ARM
Copyright (C) 1994, 95, 96, 1997 Free Software Foundation, Inc.
Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)
Modification by James G. Smith (jsmith@cygnus.co.uk)
This file is part of libopcodes.
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 of the License, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "dis-asm.h"
#define DEFINE_TABLE
#include "arm-opc.h"
#include "coff/internal.h"
#include "libcoff.h"
static char *arm_conditional[] =
{"eq", "ne", "cs", "cc", "mi", "pl", "vs", "vc",
"hi", "ls", "ge", "lt", "gt", "le", "", "nv"};
static char *arm_regnames[] =
{"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "sl", "fp", "ip", "sp", "lr", "pc"};
static char *arm_fp_const[] =
{"0.0", "1.0", "2.0", "3.0", "4.0", "5.0", "0.5", "10.0"};
static char *arm_shift[] =
{"lsl", "lsr", "asr", "ror"};
static int print_insn_arm PARAMS ((bfd_vma, struct disassemble_info *,
long));
static void
arm_decode_shift (given, func, stream)
long given;
fprintf_ftype func;
void *stream;
{
func (stream, "%s", arm_regnames[given & 0xf]);
if ((given & 0xff0) != 0)
{
if ((given & 0x10) == 0)
{
int amount = (given & 0xf80) >> 7;
int shift = (given & 0x60) >> 5;
if (amount == 0)
{
if (shift == 3)
{
func (stream, ", rrx");
return;
}
amount = 32;
}
func (stream, ", %s #%d", arm_shift[shift], amount);
}
else
func (stream, ", %s %s", arm_shift[(given & 0x60) >> 5],
arm_regnames[(given & 0xf00) >> 8]);
}
}
/* Print one instruction from PC on INFO->STREAM.
Return the size of the instruction (always 4 on ARM). */
static int
print_insn_arm (pc, info, given)
bfd_vma pc;
struct disassemble_info *info;
long given;
{
struct arm_opcode *insn;
void *stream = info->stream;
fprintf_ftype func = info->fprintf_func;
for (insn = arm_opcodes; insn->assembler; insn++)
{
if ((given & insn->mask) == insn->value)
{
char *c;
for (c = insn->assembler; *c; c++)
{
if (*c == '%')
{
switch (*++c)
{
case '%':
func (stream, "%%");
break;
case 'a':
if (((given & 0x000f0000) == 0x000f0000)
&& ((given & 0x02000000) == 0))
{
int offset = given & 0xfff;
if ((given & 0x00800000) == 0)
offset = -offset;
(*info->print_address_func)
(offset + pc + 8, info);
}
else
{
func (stream, "[%s",
arm_regnames[(given >> 16) & 0xf]);
if ((given & 0x01000000) != 0)
{
if ((given & 0x02000000) == 0)
{
int offset = given & 0xfff;
if (offset)
func (stream, ", %s#%d",
(((given & 0x00800000) == 0)
? "-" : ""), offset);
}
else
{
func (stream, ", %s",
(((given & 0x00800000) == 0)
? "-" : ""));
arm_decode_shift (given, func, stream);
}
func (stream, "]%s",
((given & 0x00200000) != 0) ? "!" : "");
}
else
{
if ((given & 0x02000000) == 0)
{
int offset = given & 0xfff;
if (offset)
func (stream, "], %s#%d",
(((given & 0x00800000) == 0)
? "-" : ""), offset);
else
func (stream, "]");
}
else
{
func (stream, "], %s",
(((given & 0x00800000) == 0)
? "-" : ""));
arm_decode_shift (given, func, stream);
}
}
}
break;
case 's':
if ((given & 0x004f0000) == 0x004f0000)
{
/* PC relative with immediate offset */
int offset = ((given & 0xf00) >> 4) | (given & 0xf);
if ((given & 0x00800000) == 0)
offset = -offset;
(*info->print_address_func)
(offset + pc + 8, info);
}
else
{
func (stream, "[%s",
arm_regnames[(given >> 16) & 0xf]);
if ((given & 0x01000000) != 0)
{
/* pre-indexed */
if ((given & 0x00400000) == 0x00400000)
{
/* immediate */
int offset = ((given & 0xf00) >> 4) | (given & 0xf);
if (offset)
func (stream, ", %s#%d",
(((given & 0x00800000) == 0)
? "-" : ""), offset);
}
else
{
/* register */
func (stream, ", %s%s",
(((given & 0x00800000) == 0)
? "-" : ""),
arm_regnames[given & 0xf]);
}
func (stream, "]%s",
((given & 0x00200000) != 0) ? "!" : "");
}
else
{
/* post-indexed */
if ((given & 0x00400000) == 0x00400000)
{
/* immediate */
int offset = ((given & 0xf00) >> 4) | (given & 0xf);
if (offset)
func (stream, "], %s#%d",
(((given & 0x00800000) == 0)
? "-" : ""), offset);
else
func (stream, "]");
}
else
{
/* register */
func (stream, "], %s%s",
(((given & 0x00800000) == 0)
? "-" : ""),
arm_regnames[given & 0xf]);
}
}
}
break;
case 'b':
(*info->print_address_func)
(BDISP (given) * 4 + pc + 8, info);
break;
case 'c':
func (stream, "%s",
arm_conditional [(given >> 28) & 0xf]);
break;
case 'm':
{
int started = 0;
int reg;
func (stream, "{");
for (reg = 0; reg < 16; reg++)
if ((given & (1 << reg)) != 0)
{
if (started)
func (stream, ", ");
started = 1;
func (stream, "%s", arm_regnames[reg]);
}
func (stream, "}");
}
break;
case 'o':
if ((given & 0x02000000) != 0)
{
int rotate = (given & 0xf00) >> 7;
int immed = (given & 0xff);
func (stream, "#%d",
((immed << (32 - rotate))
| (immed >> rotate)) & 0xffffffff);
}
else
arm_decode_shift (given, func, stream);
break;
case 'p':
if ((given & 0x0000f000) == 0x0000f000)
func (stream, "p");
break;
case 't':
if ((given & 0x01200000) == 0x00200000)
func (stream, "t");
break;
case 'h':
if ((given & 0x00000020) == 0x00000020)
func (stream, "h");
else
func (stream, "b");
break;
case 'A':
func (stream, "[%s", arm_regnames [(given >> 16) & 0xf]);
if ((given & 0x01000000) != 0)
{
int offset = given & 0xff;
if (offset)
func (stream, ", %s#%d]%s",
((given & 0x00800000) == 0 ? "-" : ""),
offset * 4,
((given & 0x00200000) != 0 ? "!" : ""));
else
func (stream, "]");
}
else
{
int offset = given & 0xff;
if (offset)
func (stream, "], %s#%d",
((given & 0x00800000) == 0 ? "-" : ""),
offset * 4);
else
func (stream, "]");
}
break;
case 'C':
switch (given & 0x00090000)
{
case 0:
func (stream, "_???");
break;
case 0x10000:
func (stream, "_ctl");
break;
case 0x80000:
func (stream, "_flg");
break;
}
break;
case 'F':
switch (given & 0x00408000)
{
case 0:
func (stream, "4");
break;
case 0x8000:
func (stream, "1");
break;
case 0x00400000:
func (stream, "2");
break;
default:
func (stream, "3");
}
break;
case 'P':
switch (given & 0x00080080)
{
case 0:
func (stream, "s");
break;
case 0x80:
func (stream, "d");
break;
case 0x00080000:
func (stream, "e");
break;
default:
func (stream, "<illegal precision>");
break;
}
break;
case 'Q':
switch (given & 0x00408000)
{
case 0:
func (stream, "s");
break;
case 0x8000:
func (stream, "d");
break;
case 0x00400000:
func (stream, "e");
break;
default:
func (stream, "p");
break;
}
break;
case 'R':
switch (given & 0x60)
{
case 0:
break;
case 0x20:
func (stream, "p");
break;
case 0x40:
func (stream, "m");
break;
default:
func (stream, "z");
break;
}
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
{
int bitstart = *c++ - '0';
int bitend = 0;
while (*c >= '0' && *c <= '9')
bitstart = (bitstart * 10) + *c++ - '0';
switch (*c)
{
case '-':
c++;
while (*c >= '0' && *c <= '9')
bitend = (bitend * 10) + *c++ - '0';
if (!bitend)
abort ();
switch (*c)
{
case 'r':
{
long reg;
reg = given >> bitstart;
reg &= (2 << (bitend - bitstart)) - 1;
func (stream, "%s", arm_regnames[reg]);
}
break;
case 'd':
{
long reg;
reg = given >> bitstart;
reg &= (2 << (bitend - bitstart)) - 1;
func (stream, "%d", reg);
}
break;
case 'x':
{
long reg;
reg = given >> bitstart;
reg &= (2 << (bitend - bitstart)) - 1;
func (stream, "0x%08x", reg);
}
break;
case 'f':
{
long reg;
reg = given >> bitstart;
reg &= (2 << (bitend - bitstart)) - 1;
if (reg > 7)
func (stream, "#%s",
arm_fp_const[reg & 7]);
else
func (stream, "f%d", reg);
}
break;
default:
abort ();
}
break;
case '`':
c++;
if ((given & (1 << bitstart)) == 0)
func (stream, "%c", *c);
break;
case '\'':
c++;
if ((given & (1 << bitstart)) != 0)
func (stream, "%c", *c);
break;
case '?':
++c;
if ((given & (1 << bitstart)) != 0)
func (stream, "%c", *c++);
else
func (stream, "%c", *++c);
break;
default:
abort ();
}
break;
default:
abort ();
}
}
}
else
func (stream, "%c", *c);
}
return 4;
}
}
abort ();
}
/* Print one instruction from PC on INFO->STREAM.
Return the size of the instruction. */
static int
print_insn_thumb (pc, info, given)
bfd_vma pc;
struct disassemble_info *info;
long given;
{
struct thumb_opcode *insn;
void *stream = info->stream;
fprintf_ftype func = info->fprintf_func;
for (insn = thumb_opcodes; insn->assembler; insn++)
{
if ((given & insn->mask) == insn->value)
{
char *c = insn->assembler;
/* Special processing for Thumb 2 instruction BL sequence: */
if (!*c) /* check for empty (not NULL) assembler string */
{
info->bytes_per_chunk = 4;
info->bytes_per_line = 4;
func (stream, "%04x\tbl\t", given & 0xffff);
(*info->print_address_func)
(BDISP23 (given) * 2 + pc + 4, info);
return 4;
}
else
{
info->bytes_per_chunk = 2;
info->bytes_per_line = 4;
given &= 0xffff;
func (stream, "%04x\t", given);
for (; *c; c++)
{
if (*c == '%')
{
int domaskpc = 0;
int domasklr = 0;
switch (*++c)
{
case '%':
func (stream, "%%");
break;
case 'S':
{
long reg;
reg = (given >> 3) & 0x7;
if (given & (1 << 6))
reg += 8;
func (stream, "%s", arm_regnames[reg]);
}
break;
case 'D':
{
long reg;
reg = given & 0x7;
if (given & (1 << 7))
reg += 8;
func (stream, "%s", arm_regnames[reg]);
}
break;
case 'T':
func (stream, "%s",
arm_conditional [(given >> 8) & 0xf]);
break;
case 'N':
if (given & (1 << 8))
domasklr = 1;
/* fall through */
case 'O':
if (*c == 'O' && (given & (1 << 8)))
domaskpc = 1;
/* fall through */
case 'M':
{
int started = 0;
int reg;
func (stream, "{");
/* It would be nice if we could spot
ranges, and generate the rS-rE format: */
for (reg = 0; (reg < 8); reg++)
if ((given & (1 << reg)) != 0)
{
if (started)
func (stream, ", ");
started = 1;
func (stream, "%s", arm_regnames[reg]);
}
if (domasklr)
{
if (started)
func (stream, ", ");
started = 1;
func (stream, "lr");
}
if (domaskpc)
{
if (started)
func (stream, ", ");
func (stream, "pc");
}
func (stream, "}");
}
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
{
int bitstart = *c++ - '0';
int bitend = 0;
while (*c >= '0' && *c <= '9')
bitstart = (bitstart * 10) + *c++ - '0';
switch (*c)
{
case '-':
{
long reg;
c++;
while (*c >= '0' && *c <= '9')
bitend = (bitend * 10) + *c++ - '0';
if (!bitend)
abort ();
reg = given >> bitstart;
reg &= (2 << (bitend - bitstart)) - 1;
switch (*c)
{
case 'r':
func (stream, "%s", arm_regnames[reg]);
break;
case 'd':
func (stream, "%d", reg);
break;
case 'H':
func (stream, "%d", reg << 1);
break;
case 'W':
func (stream, "%d", reg << 2);
break;
case 'a':
info->print_address_func (((pc + 4) & ~1) + (reg << 2), info);
break;
case 'x':
func (stream, "0x%04x", reg);
break;
case 'I':
reg = ((reg ^ (1 << bitend)) - (1 << bitend));
func (stream, "%d", reg);
break;
case 'B':
reg = ((reg ^ (1 << bitend)) - (1 << bitend));
(*info->print_address_func)
(reg * 2 + pc + 4, info);
break;
default:
abort();
}
}
break;
case '\'':
c++;
if ((given & (1 << bitstart)) != 0)
func (stream, "%c", *c);
break;
case '?':
++c;
if ((given & (1 << bitstart)) != 0)
func (stream, "%c", *c++);
else
func (stream, "%c", *++c);
break;
default:
abort();
}
}
break;
default:
abort ();
}
}
else
func (stream, "%c", *c);
}
}
return 2;
}
}
/* no match */
abort ();
}
/* NOTE: There are no checks in these routines that the relevant number of data bytes exist */
int
print_insn_big_arm (pc, info)
bfd_vma pc;
struct disassemble_info *info;
{
unsigned char b[4];
long given;
int status;
asymbol * saved_symbol;
coff_symbol_type * cs;
int is_thumb;
cs = coffsymbol (info->symbol);
is_thumb =
( cs->native->u.syment.n_sclass == C_THUMBEXT
|| cs->native->u.syment.n_sclass == C_THUMBSTAT
|| cs->native->u.syment.n_sclass == C_THUMBLABEL
|| cs->native->u.syment.n_sclass == C_THUMBEXTFUNC
|| cs->native->u.syment.n_sclass == C_THUMBSTATFUNC);
info->bytes_per_chunk = 4;
info->display_endian = BFD_ENDIAN_BIG;
/* Always fetch word aligned values. */
status = (*info->read_memory_func) (pc & ~ 0x3, (bfd_byte *) &b[0], 4, info);
if (status != 0)
{
(*info->memory_error_func) (status, pc, info);
return -1;
}
if (is_thumb)
{
if (pc & 0x2)
{
given = (b[2] << 8) | b[3];
status = info->read_memory_func ((pc + 4) & ~ 0x3, (bfd_byte *) b, 4, info);
if (status != 0)
{
info->memory_error_func (status, pc + 4, info);
return -1;
}
given |= (b[0] << 24) | (b[1] << 16);
}
else
{
given = (b[0] << 8) | b[1] | (b[2] << 24) | (b[3] << 16);
}
}
else
{
given = (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | (b[3]);
}
if (is_thumb)
{
status = print_insn_thumb (pc, info, given);
}
else
{
status = print_insn_arm (pc, info, given);
}
info->symbol = saved_symbol; /* Stop displayed symbols from resetting the stored symbol */
return status;
}
int
print_insn_little_arm (pc, info)
bfd_vma pc;
struct disassemble_info * info;
{
unsigned char b[4];
long given;
int status;
asymbol * saved_symbol;
coff_symbol_type * cs;
int is_thumb;
cs = coffsymbol (info->symbol);
is_thumb =
( cs->native->u.syment.n_sclass == C_THUMBEXT
|| cs->native->u.syment.n_sclass == C_THUMBSTAT
|| cs->native->u.syment.n_sclass == C_THUMBLABEL
|| cs->native->u.syment.n_sclass == C_THUMBEXTFUNC
|| cs->native->u.syment.n_sclass == C_THUMBSTATFUNC);
info->bytes_per_chunk = 4;
info->display_endian = BFD_ENDIAN_LITTLE;
status = (*info->read_memory_func) (pc, (bfd_byte *) &b[0], 4, info);
if (status != 0 && is_thumb)
{
info->bytes_per_chunk = 2;
status = info->read_memory_func (pc, (bfd_byte *) b, 2, info);
b[3] = b[2] = 0;
}
if (status != 0)
{
(*info->memory_error_func) (status, pc, info);
return -1;
}
given = (b[0]) | (b[1] << 8) | (b[2] << 16) | (b[3] << 24);
saved_symbol = info->symbol;
if (is_thumb)
{
status = print_insn_thumb (pc, info, given);
}
else
{
status = print_insn_arm (pc, info, given);
}
info->symbol = saved_symbol; /* Stop displayed symbols from resetting the stored symbol */
return status;
}