mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-18 11:08:26 +00:00
348 lines
9.2 KiB
C
348 lines
9.2 KiB
C
/* M32R opcode support. -*- C -*-
|
||
|
||
Copyright 1998, 1999, 2000, 2001, 2004, 2005, 2007, 2009
|
||
Free Software Foundation, Inc.
|
||
|
||
Contributed by Red Hat Inc; developed under contract from
|
||
Mitsubishi Electric Corporation.
|
||
|
||
This file is part of the GNU Binutils.
|
||
|
||
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 3 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., 51 Franklin Street - Fifth Floor, Boston,
|
||
MA 02110-1301, USA. */
|
||
|
||
|
||
/* This file is an addendum to m32r.cpu. Heavy use of C code isn't
|
||
appropriate in .cpu files, so it resides here. This especially applies
|
||
to assembly/disassembly where parsing/printing can be quite involved.
|
||
Such things aren't really part of the specification of the cpu, per se,
|
||
so .cpu files provide the general framework and .opc files handle the
|
||
nitty-gritty details as necessary.
|
||
|
||
Each section is delimited with start and end markers.
|
||
|
||
<arch>-opc.h additions use: "-- opc.h"
|
||
<arch>-opc.c additions use: "-- opc.c"
|
||
<arch>-asm.c additions use: "-- asm.c"
|
||
<arch>-dis.c additions use: "-- dis.c"
|
||
<arch>-ibd.h additions use: "-- ibd.h" */
|
||
|
||
/* -- opc.h */
|
||
|
||
#undef CGEN_DIS_HASH_SIZE
|
||
#define CGEN_DIS_HASH_SIZE 256
|
||
#undef CGEN_DIS_HASH
|
||
#if 0
|
||
#define X(b) (((unsigned char *) (b))[0] & 0xf0)
|
||
#define CGEN_DIS_HASH(buffer, value) \
|
||
(X (buffer) | \
|
||
(X (buffer) == 0x40 || X (buffer) == 0xe0 || X (buffer) == 0x60 || X (buffer) == 0x50 ? 0 \
|
||
: X (buffer) == 0x70 || X (buffer) == 0xf0 ? (((unsigned char *) (buffer))[0] & 0xf) \
|
||
: X (buffer) == 0x30 ? ((((unsigned char *) (buffer))[1] & 0x70) >> 4) \
|
||
: ((((unsigned char *) (buffer))[1] & 0xf0) >> 4)))
|
||
#else
|
||
#define CGEN_DIS_HASH(buffer, value) m32r_cgen_dis_hash (buffer, value)
|
||
extern unsigned int m32r_cgen_dis_hash (const char *, CGEN_INSN_INT);
|
||
#endif
|
||
|
||
/* -- */
|
||
|
||
/* -- opc.c */
|
||
unsigned int
|
||
m32r_cgen_dis_hash (const char * buf ATTRIBUTE_UNUSED, CGEN_INSN_INT value)
|
||
{
|
||
unsigned int x;
|
||
|
||
if (value & 0xffff0000) /* 32bit instructions. */
|
||
value = (value >> 16) & 0xffff;
|
||
|
||
x = (value >> 8) & 0xf0;
|
||
if (x == 0x40 || x == 0xe0 || x == 0x60 || x == 0x50)
|
||
return x;
|
||
|
||
if (x == 0x70 || x == 0xf0)
|
||
return x | ((value >> 8) & 0x0f);
|
||
|
||
if (x == 0x30)
|
||
return x | ((value & 0x70) >> 4);
|
||
else
|
||
return x | ((value & 0xf0) >> 4);
|
||
}
|
||
|
||
/* -- */
|
||
|
||
/* -- asm.c */
|
||
static const char * MISSING_CLOSING_PARENTHESIS = N_("missing `)'");
|
||
|
||
/* Handle '#' prefixes (i.e. skip over them). */
|
||
|
||
static const char *
|
||
parse_hash (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
|
||
const char **strp,
|
||
int opindex ATTRIBUTE_UNUSED,
|
||
long *valuep ATTRIBUTE_UNUSED)
|
||
{
|
||
if (**strp == '#')
|
||
++*strp;
|
||
return NULL;
|
||
}
|
||
|
||
/* Handle shigh(), high(). */
|
||
|
||
static const char *
|
||
parse_hi16 (CGEN_CPU_DESC cd,
|
||
const char **strp,
|
||
int opindex,
|
||
unsigned long *valuep)
|
||
{
|
||
const char *errmsg;
|
||
enum cgen_parse_operand_result result_type;
|
||
bfd_vma value;
|
||
|
||
if (**strp == '#')
|
||
++*strp;
|
||
|
||
if (strncasecmp (*strp, "high(", 5) == 0)
|
||
{
|
||
*strp += 5;
|
||
errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_HI16_ULO,
|
||
& result_type, & value);
|
||
if (**strp != ')')
|
||
return MISSING_CLOSING_PARENTHESIS;
|
||
++*strp;
|
||
if (errmsg == NULL
|
||
&& result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
|
||
{
|
||
value >>= 16;
|
||
value &= 0xffff;
|
||
}
|
||
*valuep = value;
|
||
return errmsg;
|
||
}
|
||
else if (strncasecmp (*strp, "shigh(", 6) == 0)
|
||
{
|
||
*strp += 6;
|
||
errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_HI16_SLO,
|
||
& result_type, & value);
|
||
if (**strp != ')')
|
||
return MISSING_CLOSING_PARENTHESIS;
|
||
++*strp;
|
||
if (errmsg == NULL
|
||
&& result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
|
||
{
|
||
value += 0x8000;
|
||
value >>= 16;
|
||
value &= 0xffff;
|
||
}
|
||
*valuep = value;
|
||
return errmsg;
|
||
}
|
||
|
||
return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
|
||
}
|
||
|
||
/* Handle low() in a signed context. Also handle sda().
|
||
The signedness of the value doesn't matter to low(), but this also
|
||
handles the case where low() isn't present. */
|
||
|
||
static const char *
|
||
parse_slo16 (CGEN_CPU_DESC cd,
|
||
const char ** strp,
|
||
int opindex,
|
||
long * valuep)
|
||
{
|
||
const char *errmsg;
|
||
enum cgen_parse_operand_result result_type;
|
||
bfd_vma value;
|
||
|
||
if (**strp == '#')
|
||
++*strp;
|
||
|
||
if (strncasecmp (*strp, "low(", 4) == 0)
|
||
{
|
||
*strp += 4;
|
||
errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
|
||
& result_type, & value);
|
||
if (**strp != ')')
|
||
return MISSING_CLOSING_PARENTHESIS;
|
||
++*strp;
|
||
if (errmsg == NULL
|
||
&& result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
|
||
value = ((value & 0xffff) ^ 0x8000) - 0x8000;
|
||
*valuep = value;
|
||
return errmsg;
|
||
}
|
||
|
||
if (strncasecmp (*strp, "sda(", 4) == 0)
|
||
{
|
||
*strp += 4;
|
||
errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_SDA16,
|
||
NULL, & value);
|
||
if (**strp != ')')
|
||
return MISSING_CLOSING_PARENTHESIS;
|
||
++*strp;
|
||
*valuep = value;
|
||
return errmsg;
|
||
}
|
||
|
||
return cgen_parse_signed_integer (cd, strp, opindex, valuep);
|
||
}
|
||
|
||
/* Handle low() in an unsigned context.
|
||
The signedness of the value doesn't matter to low(), but this also
|
||
handles the case where low() isn't present. */
|
||
|
||
static const char *
|
||
parse_ulo16 (CGEN_CPU_DESC cd,
|
||
const char **strp,
|
||
int opindex,
|
||
unsigned long *valuep)
|
||
{
|
||
const char *errmsg;
|
||
enum cgen_parse_operand_result result_type;
|
||
bfd_vma value;
|
||
|
||
if (**strp == '#')
|
||
++*strp;
|
||
|
||
if (strncasecmp (*strp, "low(", 4) == 0)
|
||
{
|
||
*strp += 4;
|
||
errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
|
||
& result_type, & value);
|
||
if (**strp != ')')
|
||
return MISSING_CLOSING_PARENTHESIS;
|
||
++*strp;
|
||
if (errmsg == NULL
|
||
&& result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
|
||
value &= 0xffff;
|
||
*valuep = value;
|
||
return errmsg;
|
||
}
|
||
|
||
return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
|
||
}
|
||
|
||
/* -- */
|
||
|
||
/* -- dis.c */
|
||
|
||
/* Print signed operands with '#' prefixes. */
|
||
|
||
static void
|
||
print_signed_with_hash_prefix (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
|
||
void * dis_info,
|
||
long value,
|
||
unsigned int attrs ATTRIBUTE_UNUSED,
|
||
bfd_vma pc ATTRIBUTE_UNUSED,
|
||
int length ATTRIBUTE_UNUSED)
|
||
{
|
||
disassemble_info *info = (disassemble_info *) dis_info;
|
||
|
||
(*info->fprintf_func) (info->stream, "#");
|
||
(*info->fprintf_func) (info->stream, "%ld", value);
|
||
}
|
||
|
||
/* Print unsigned operands with '#' prefixes. */
|
||
|
||
static void
|
||
print_unsigned_with_hash_prefix (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
|
||
void * dis_info,
|
||
long value,
|
||
unsigned int attrs ATTRIBUTE_UNUSED,
|
||
bfd_vma pc ATTRIBUTE_UNUSED,
|
||
int length ATTRIBUTE_UNUSED)
|
||
{
|
||
disassemble_info *info = (disassemble_info *) dis_info;
|
||
|
||
(*info->fprintf_func) (info->stream, "#");
|
||
(*info->fprintf_func) (info->stream, "0x%lx", value);
|
||
}
|
||
|
||
/* Handle '#' prefixes as operands. */
|
||
|
||
static void
|
||
print_hash (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
|
||
void * dis_info,
|
||
long value ATTRIBUTE_UNUSED,
|
||
unsigned int attrs ATTRIBUTE_UNUSED,
|
||
bfd_vma pc ATTRIBUTE_UNUSED,
|
||
int length ATTRIBUTE_UNUSED)
|
||
{
|
||
disassemble_info *info = (disassemble_info *) dis_info;
|
||
|
||
(*info->fprintf_func) (info->stream, "#");
|
||
}
|
||
|
||
#undef CGEN_PRINT_INSN
|
||
#define CGEN_PRINT_INSN my_print_insn
|
||
|
||
static int
|
||
my_print_insn (CGEN_CPU_DESC cd,
|
||
bfd_vma pc,
|
||
disassemble_info *info)
|
||
{
|
||
bfd_byte buffer[CGEN_MAX_INSN_SIZE];
|
||
bfd_byte *buf = buffer;
|
||
int status;
|
||
int buflen = (pc & 3) == 0 ? 4 : 2;
|
||
int big_p = CGEN_CPU_INSN_ENDIAN (cd) == CGEN_ENDIAN_BIG;
|
||
bfd_byte *x;
|
||
|
||
/* Read the base part of the insn. */
|
||
|
||
status = (*info->read_memory_func) (pc - ((!big_p && (pc & 3) != 0) ? 2 : 0),
|
||
buf, buflen, info);
|
||
if (status != 0)
|
||
{
|
||
(*info->memory_error_func) (status, pc, info);
|
||
return -1;
|
||
}
|
||
|
||
/* 32 bit insn? */
|
||
x = (big_p ? &buf[0] : &buf[3]);
|
||
if ((pc & 3) == 0 && (*x & 0x80) != 0)
|
||
return print_insn (cd, pc, info, buf, buflen);
|
||
|
||
/* Print the first insn. */
|
||
if ((pc & 3) == 0)
|
||
{
|
||
buf += (big_p ? 0 : 2);
|
||
if (print_insn (cd, pc, info, buf, 2) == 0)
|
||
(*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
|
||
buf += (big_p ? 2 : -2);
|
||
}
|
||
|
||
x = (big_p ? &buf[0] : &buf[1]);
|
||
if (*x & 0x80)
|
||
{
|
||
/* Parallel. */
|
||
(*info->fprintf_func) (info->stream, " || ");
|
||
*x &= 0x7f;
|
||
}
|
||
else
|
||
(*info->fprintf_func) (info->stream, " -> ");
|
||
|
||
/* The "& 3" is to pass a consistent address.
|
||
Parallel insns arguably both begin on the word boundary.
|
||
Also, branch insns are calculated relative to the word boundary. */
|
||
if (print_insn (cd, pc & ~ (bfd_vma) 3, info, buf, 2) == 0)
|
||
(*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
|
||
|
||
return (pc & 3) ? 2 : 4;
|
||
}
|
||
|
||
/* -- */
|