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darling-gdb/opcodes/score-dis.c
Nick Clifton 9b201bb5e5 Change source files over to GPLv3.
2007-07-05 09:49:03 +00:00

505 lines
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C
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/* Instruction printing code for Score
Copyright 2006, 2007 Free Software Foundation, Inc.
Contributed by:
Mei Ligang (ligang@sunnorth.com.cn)
Pei-Lin Tsai (pltsai@sunplus.com)
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"
#include "dis-asm.h"
#define DEFINE_TABLE
#include "score-opc.h"
#include "opintl.h"
#include "bfd.h"
/* FIXME: This shouldn't be done here. */
#include "elf-bfd.h"
#include "elf/internal.h"
#include "elf/score.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
typedef struct
{
const char *name;
const char *description;
const char *reg_names[32];
} score_regname;
static score_regname regnames[] =
{
{"gcc", "Select register names used by GCC",
{"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
"r11", "r12", "r13", "r14", "r15", "r16", "r17", "r18", "r19", "r20",
"r21", "r22", "r23", "r24", "r25", "r26", "r27", "gp", "r29", "r30", "r31"}},
};
static unsigned int regname_selected = 0;
#define NUM_SCORE_REGNAMES NUM_ELEM (regnames)
#define score_regnames regnames[regname_selected].reg_names
/* Print one instruction from PC on INFO->STREAM.
Return the size of the instruction. */
static int
print_insn_score32 (bfd_vma pc, struct disassemble_info *info, long given)
{
struct score_opcode *insn;
void *stream = info->stream;
fprintf_ftype func = info->fprintf_func;
for (insn = score_opcodes; insn->assembler; insn++)
{
if ((insn->mask & 0xffff0000) && (given & insn->mask) == insn->value)
{
char *c;
for (c = insn->assembler; *c; c++)
{
if (*c == '%')
{
switch (*++c)
{
case 'j':
{
int target;
if (info->flags & INSN_HAS_RELOC)
pc = 0;
target = (pc & 0xfe000000) | (given & 0x01fffffe);
(*info->print_address_func) (target, info);
}
break;
case 'b':
{
/* Sign-extend a 20-bit number. */
#define SEXT20(x) ((((x) & 0xfffff) ^ (~ 0x7ffff)) + 0x80000)
int disp = ((given & 0x01ff8000) >> 5) | (given & 0x3fe);
int target = (pc + SEXT20 (disp));
(*info->print_address_func) (target, info);
}
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", score_regnames[reg]);
}
break;
case 'd':
{
long reg;
reg = given >> bitstart;
reg &= (2 << (bitend - bitstart)) - 1;
func (stream, "%ld", reg);
}
break;
case 'i':
{
long reg;
reg = given >> bitstart;
reg &= (2 << (bitend - bitstart)) - 1;
reg = ((reg ^ (1 << (bitend - bitstart))) -
(1 << (bitend - bitstart)));
if (((given & insn->mask) == 0x0c00000a) /* ldc1 */
|| ((given & insn->mask) == 0x0c000012) /* ldc2 */
|| ((given & insn->mask) == 0x0c00001c) /* ldc3 */
|| ((given & insn->mask) == 0x0c00000b) /* stc1 */
|| ((given & insn->mask) == 0x0c000013) /* stc2 */
|| ((given & insn->mask) == 0x0c00001b)) /* stc3 */
reg <<= 2;
func (stream, "%ld", reg);
}
break;
case 'x':
{
long reg;
reg = given >> bitstart;
reg &= (2 << (bitend - bitstart)) - 1;
func (stream, "%lx", 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;
default:
abort ();
}
break;
default:
abort ();
}
}
}
else
func (stream, "%c", *c);
}
return 4;
}
}
#if (SCORE_SIMULATOR_ACTIVE)
func (stream, _("<illegal instruction>"));
return 4;
#endif
abort ();
}
static void
print_insn_parallel_sym (struct disassemble_info *info)
{
void *stream = info->stream;
fprintf_ftype func = info->fprintf_func;
/* 10: 0000 nop!
4 space + 1 colon + 1 space + 1 tab + 8 opcode + 2 space + 1 tab.
FIXME: the space number is not accurate. */
func (stream, "%s", " ||\n \t \t");
}
/* Print one instruction from PC on INFO->STREAM.
Return the size of the instruction. */
static int
print_insn_score16 (bfd_vma pc, struct disassemble_info *info, long given)
{
struct score_opcode *insn;
void *stream = info->stream;
fprintf_ftype func = info->fprintf_func;
given &= 0xffff;
for (insn = score_opcodes; insn->assembler; insn++)
{
if (!(insn->mask & 0xffff0000) && (given & insn->mask) == insn->value)
{
char *c = insn->assembler;
info->bytes_per_chunk = 2;
info->bytes_per_line = 4;
given &= 0xffff;
for (; *c; c++)
{
if (*c == '%')
{
switch (*++c)
{
case 'j':
{
int target;
if (info->flags & INSN_HAS_RELOC)
pc = 0;
target = (pc & 0xfffff000) | (given & 0x00000ffe);
(*info->print_address_func) (target, info);
}
break;
case 'b':
{
/* Sign-extend a 9-bit number. */
#define SEXT9(x) ((((x) & 0x1ff) ^ (~ 0xff)) + 0x100)
int disp = (given & 0xff) << 1;
int target = (pc + SEXT9 (disp));
(*info->print_address_func) (target, info);
}
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", score_regnames[reg + 16]);
break;
case 'r':
func (stream, "%s", score_regnames[reg]);
break;
case 'd':
if (*(c + 1) == '\0')
func (stream, "%ld", reg);
else
{
c++;
if (*c == '1')
func (stream, "%ld", reg << 1);
else if (*c == '2')
func (stream, "%ld", reg << 2);
}
break;
case 'x':
if (*(c + 1) == '\0')
func (stream, "%lx", reg);
else
{
c++;
if (*c == '1')
func (stream, "%lx", reg << 1);
else if (*c == '2')
func (stream, "%lx", reg << 2);
}
break;
case 'i':
reg = ((reg ^ (1 << bitend)) - (1 << bitend));
func (stream, "%ld", reg);
break;
default:
abort ();
}
}
break;
case '\'':
c++;
if ((given & (1 << bitstart)) != 0)
func (stream, "%c", *c);
break;
default:
abort ();
}
}
break;
default:
abort ();
}
}
else
func (stream, "%c", *c);
}
return 2;
}
}
#if (SCORE_SIMULATOR_ACTIVE)
func (stream, _("<illegal instruction>"));
return 2;
#endif
/* No match. */
abort ();
}
/* NOTE: There are no checks in these routines that
the relevant number of data bytes exist. */
static int
print_insn (bfd_vma pc, struct disassemble_info *info, bfd_boolean little)
{
unsigned char b[4];
long given;
long ridparity;
int status;
bfd_boolean insn_pce_p = FALSE;
bfd_boolean insn_16_p = FALSE;
info->display_endian = little ? BFD_ENDIAN_LITTLE : BFD_ENDIAN_BIG;
if (pc & 0x2)
{
info->bytes_per_chunk = 2;
status = info->read_memory_func (pc, (bfd_byte *) b, 2, info);
b[3] = b[2] = 0;
insn_16_p = TRUE;
}
else
{
info->bytes_per_chunk = 4;
status = info->read_memory_func (pc, (bfd_byte *) & b[0], 4, info);
if (status != 0)
{
info->bytes_per_chunk = 2;
status = info->read_memory_func (pc, (bfd_byte *) b, 2, info);
b[3] = b[2] = 0;
insn_16_p = TRUE;
}
}
if (status != 0)
{
info->memory_error_func (status, pc, info);
return -1;
}
if (little)
{
given = (b[0]) | (b[1] << 8) | (b[2] << 16) | (b[3] << 24);
}
else
{
given = (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | (b[3]);
}
if ((given & 0x80008000) == 0x80008000)
{
insn_pce_p = FALSE;
insn_16_p = FALSE;
}
else if ((given & 0x8000) == 0x8000)
{
insn_pce_p = TRUE;
}
else
{
insn_16_p = TRUE;
}
/* 16 bit instruction. */
if (insn_16_p)
{
if (little)
{
given = b[0] | (b[1] << 8);
}
else
{
given = (b[0] << 8) | b[1];
}
status = print_insn_score16 (pc, info, given);
}
/* pce instruction. */
else if (insn_pce_p)
{
long other;
other = given & 0xFFFF;
given = (given & 0xFFFF0000) >> 16;
status = print_insn_score16 (pc, info, given);
print_insn_parallel_sym (info);
status += print_insn_score16 (pc, info, other);
/* disassemble_bytes() will output 4 byte per chunk for pce instructio. */
info->bytes_per_chunk = 4;
}
/* 32 bit instruction. */
else
{
/* Get rid of parity. */
ridparity = (given & 0x7FFF);
ridparity |= (given & 0x7FFF0000) >> 1;
given = ridparity;
status = print_insn_score32 (pc, info, given);
}
return status;
}
int
print_insn_big_score (bfd_vma pc, struct disassemble_info *info)
{
return print_insn (pc, info, FALSE);
}
int
print_insn_little_score (bfd_vma pc, struct disassemble_info *info)
{
return print_insn (pc, info, TRUE);
}
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