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binutils-gdb/opcodes/arm-dis.c
Nick Clifton 077b8428ab Add ARM v5t, v5te and XScale support
2000-11-25 00:21:40 +00:00

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/* Instruction printing code for the ARM
Copyright (C) 1994, 95, 96, 97, 98, 99, 2000 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 "sysdep.h"
#include "dis-asm.h"
#define DEFINE_TABLE
#include "arm-opc.h"
#include "coff/internal.h"
#include "libcoff.h"
#include "opintl.h"
/* FIXME: This shouldn't be done here */
#include "elf-bfd.h"
#include "elf/internal.h"
#include "elf/arm.h"
#ifndef streq
#define streq(a,b) (strcmp ((a), (b)) == 0)
#endif
#ifndef strneq
#define strneq(a,b,n) (strncmp ((a), (b), (n)) == 0)
#endif
#ifndef NUM_ELEM
#define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0])
#endif
static char * arm_conditional[] =
{"eq", "ne", "cs", "cc", "mi", "pl", "vs", "vc",
"hi", "ls", "ge", "lt", "gt", "le", "", "nv"};
typedef struct
{
const char * name;
const char * description;
const char * reg_names[16];
}
arm_regname;
static arm_regname regnames[] =
{
{ "raw" , "Select raw register names",
{ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"}},
{ "gcc", "Select register names used by GCC",
{ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "sl", "fp", "ip", "sp", "lr", "pc" }},
{ "std", "Select register names used in ARM's ISA documentation",
{ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "sp", "lr", "pc" }},
{ "apcs", "Select register names used in the APCS",
{ "a1", "a2", "a3", "a4", "v1", "v2", "v3", "v4", "v5", "v6", "sl", "fp", "ip", "sp", "lr", "pc" }},
{ "atpcs", "Select register names used in the ATPCS",
{ "a1", "a2", "a3", "a4", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "IP", "SP", "LR", "PC" }},
{ "special-atpcs", "Select special register names used in the ATPCS",
{ "a1", "a2", "a3", "a4", "v1", "v2", "v3", "WR", "v5", "SB", "SL", "FP", "IP", "SP", "LR", "PC" }}
};
/* Default to GCC register name set. */
static unsigned int regname_selected = 1;
#define NUM_ARM_REGNAMES NUM_ELEM (regnames)
#define arm_regnames regnames[regname_selected].reg_names
static boolean force_thumb = false;
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"};
/* Forward declarations. */
static void arm_decode_shift PARAMS ((long, fprintf_ftype, void *));
static int print_insn_arm PARAMS ((bfd_vma, struct disassemble_info *, long));
static int print_insn_thumb PARAMS ((bfd_vma, struct disassemble_info *, long));
static void parse_disassembler_options PARAMS ((char *));
static int print_insn PARAMS ((bfd_vma, struct disassemble_info *, boolean));
int get_arm_regname_num_options (void);
int set_arm_regname_option (int option);
int get_arm_regnames (int option, const char **setname,
const char **setdescription,
const char ***register_names);
/* Functions. */
int
get_arm_regname_num_options (void)
{
return NUM_ARM_REGNAMES;
}
int
set_arm_regname_option (int option)
{
int old = regname_selected;
regname_selected = option;
return old;
}
int
get_arm_regnames (int option, const char **setname,
const char **setdescription,
const char ***register_names)
{
*setname = regnames[option].name;
*setdescription = regnames[option].description;
*register_names = regnames[option].reg_names;
return 16;
}
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;
func (stream, "[pc");
if (given & 0x01000000)
{
if ((given & 0x00800000) == 0)
offset = - offset;
/* pre-indexed */
func (stream, ", #%x]", offset);
offset += pc + 8;
/* Cope with the possibility of write-back
being used. Probably a very dangerous thing
for the programmer to do, but who are we to
argue ? */
if (given & 0x00200000)
func (stream, "!");
}
else
{
/* Post indexed. */
func (stream, "], #%x", offset);
offset = pc + 8; /* ie ignore the offset. */
}
func (stream, "\t; ");
info->print_address_func (offset, 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;
func (stream, "[pc, #%x]\t; ", 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);
immed = (((immed << (32 - rotate))
| (immed >> rotate)) & 0xffffffff);
func (stream, "#%d\t; 0x%x", immed, immed);
}
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 'B':
/* Print ARM V5 BLX(1) address: pc+25 bits. */
{
bfd_vma address;
bfd_vma offset = 0;
if (given & 0x00800000)
/* Is signed, hi bits should be ones. */
offset = (-1) ^ 0x00ffffff;
/* Offset is (SignExtend(offset field)<<2). */
offset += given & 0x00ffffff;
offset <<= 2;
address = offset + pc + 8;
if (given & 0x01000000)
/* H bit allows addressing to 2-byte boundaries. */
address += 2;
info->print_address_func (address, info);
}
break;
case 'C':
func (stream, "_");
if (given & 0x80000)
func (stream, "f");
if (given & 0x40000)
func (stream, "s");
if (given & 0x20000)
func (stream, "x");
if (given & 0x10000)
func (stream, "c");
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);
/* Some SWI instructions have special
meanings. */
if ((given & 0x0fffffff) == 0x0FF00000)
func (stream, "\t; IMB");
else if ((given & 0x0fffffff) == 0x0FF00001)
func (stream, "\t; IMBRange");
}
break;
case 'X':
{
long reg;
reg = given >> bitstart;
reg &= (2 << (bitend - bitstart)) - 1;
func (stream, "%01x", reg & 0xf);
}
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;
if ((given & 0x10000000) == 0)
func (stream, "blx\t");
else
func (stream, "bl\t");
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;
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, arm_regnames[14] /* "lr" */);
}
if (domaskpc)
{
if (started)
func (stream, ", ");
func (stream, arm_regnames[15] /* "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':
/* PC-relative address -- the bottom two
bits of the address are dropped
before the calculation. */
info->print_address_func
(((pc + 4) & ~3) + (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 ();
}
/* Parse an individual disassembler option. */
void
parse_arm_disassembler_option (option)
char * option;
{
if (option == NULL)
return;
if (strneq (option, "reg-names-", 10))
{
int i;
option += 10;
for (i = NUM_ARM_REGNAMES; i--;)
if (streq (option, regnames[i].name))
{
regname_selected = i;
break;
}
if (i < 0)
fprintf (stderr, _("Unrecognised register name set: %s\n"), option);
}
else if (streq (option, "force-thumb"))
force_thumb = 1;
else if (streq (option, "no-force-thumb"))
force_thumb = 0;
else
fprintf (stderr, _("Unrecognised disassembler option: %s\n"), option);
return;
}
/* Parse the string of disassembler options, spliting it at whitespaces. */
static void
parse_disassembler_options (options)
char * options;
{
char * space;
if (options == NULL)
return;
do
{
space = strchr (options, ' ');
if (space)
{
* space = '\0';
parse_arm_disassembler_option (options);
* space = ' ';
options = space + 1;
}
else
parse_arm_disassembler_option (options);
}
while (space);
}
/* NOTE: There are no checks in these routines that
the relevant number of data bytes exist. */
static int
print_insn (pc, info, little)
bfd_vma pc;
struct disassemble_info * info;
boolean little;
{
unsigned char b[4];
long given;
int status;
int is_thumb;
if (info->disassembler_options)
{
parse_disassembler_options (info->disassembler_options);
/* To avoid repeated parsing of these options, we remove them here. */
info->disassembler_options = NULL;
}
is_thumb = force_thumb;
if (!is_thumb && info->symbols != NULL)
{
if (bfd_asymbol_flavour (*info->symbols) == bfd_target_coff_flavour)
{
coff_symbol_type * cs;
cs = coffsymbol (*info->symbols);
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);
}
else if (bfd_asymbol_flavour (*info->symbols) == bfd_target_elf_flavour)
{
elf_symbol_type * es;
unsigned int type;
es = *(elf_symbol_type **)(info->symbols);
type = ELF_ST_TYPE (es->internal_elf_sym.st_info);
is_thumb = (type == STT_ARM_TFUNC) || (type == STT_ARM_16BIT);
}
}
info->bytes_per_chunk = 4;
info->display_endian = little ? BFD_ENDIAN_LITTLE : BFD_ENDIAN_BIG;
if (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);
}
else
{
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);
return status;
}
int
print_insn_big_arm (pc, info)
bfd_vma pc;
struct disassemble_info * info;
{
return print_insn (pc, info, false);
}
int
print_insn_little_arm (pc, info)
bfd_vma pc;
struct disassemble_info * info;
{
return print_insn (pc, info, true);
}
void
print_arm_disassembler_options (FILE * stream)
{
int i;
fprintf (stream, _("\n\
The following ARM specific disassembler options are supported for use with\n\
the -M switch:\n"));
for (i = NUM_ARM_REGNAMES; i--;)
fprintf (stream, " reg-names-%s %*c%s\n",
regnames[i].name,
14 - strlen (regnames[i].name), ' ',
regnames[i].description);
fprintf (stream, " force-thumb Assume all insns are Thumb insns\n");
fprintf (stream, " no-force-thumb Examine preceeding label to determine an insn's type\n\n");
}
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